xref: /openbmc/linux/net/sctp/socket.c (revision 7b73a9c8)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* SCTP kernel implementation
3  * (C) Copyright IBM Corp. 2001, 2004
4  * Copyright (c) 1999-2000 Cisco, Inc.
5  * Copyright (c) 1999-2001 Motorola, Inc.
6  * Copyright (c) 2001-2003 Intel Corp.
7  * Copyright (c) 2001-2002 Nokia, Inc.
8  * Copyright (c) 2001 La Monte H.P. Yarroll
9  *
10  * This file is part of the SCTP kernel implementation
11  *
12  * These functions interface with the sockets layer to implement the
13  * SCTP Extensions for the Sockets API.
14  *
15  * Note that the descriptions from the specification are USER level
16  * functions--this file is the functions which populate the struct proto
17  * for SCTP which is the BOTTOM of the sockets interface.
18  *
19  * Please send any bug reports or fixes you make to the
20  * email address(es):
21  *    lksctp developers <linux-sctp@vger.kernel.org>
22  *
23  * Written or modified by:
24  *    La Monte H.P. Yarroll <piggy@acm.org>
25  *    Narasimha Budihal     <narsi@refcode.org>
26  *    Karl Knutson          <karl@athena.chicago.il.us>
27  *    Jon Grimm             <jgrimm@us.ibm.com>
28  *    Xingang Guo           <xingang.guo@intel.com>
29  *    Daisy Chang           <daisyc@us.ibm.com>
30  *    Sridhar Samudrala     <samudrala@us.ibm.com>
31  *    Inaky Perez-Gonzalez  <inaky.gonzalez@intel.com>
32  *    Ardelle Fan	    <ardelle.fan@intel.com>
33  *    Ryan Layer	    <rmlayer@us.ibm.com>
34  *    Anup Pemmaiah         <pemmaiah@cc.usu.edu>
35  *    Kevin Gao             <kevin.gao@intel.com>
36  */
37 
38 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
39 
40 #include <crypto/hash.h>
41 #include <linux/types.h>
42 #include <linux/kernel.h>
43 #include <linux/wait.h>
44 #include <linux/time.h>
45 #include <linux/sched/signal.h>
46 #include <linux/ip.h>
47 #include <linux/capability.h>
48 #include <linux/fcntl.h>
49 #include <linux/poll.h>
50 #include <linux/init.h>
51 #include <linux/slab.h>
52 #include <linux/file.h>
53 #include <linux/compat.h>
54 #include <linux/rhashtable.h>
55 
56 #include <net/ip.h>
57 #include <net/icmp.h>
58 #include <net/route.h>
59 #include <net/ipv6.h>
60 #include <net/inet_common.h>
61 #include <net/busy_poll.h>
62 
63 #include <linux/socket.h> /* for sa_family_t */
64 #include <linux/export.h>
65 #include <net/sock.h>
66 #include <net/sctp/sctp.h>
67 #include <net/sctp/sm.h>
68 #include <net/sctp/stream_sched.h>
69 
70 /* Forward declarations for internal helper functions. */
71 static bool sctp_writeable(struct sock *sk);
72 static void sctp_wfree(struct sk_buff *skb);
73 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
74 				size_t msg_len);
75 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p);
76 static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
77 static int sctp_wait_for_accept(struct sock *sk, long timeo);
78 static void sctp_wait_for_close(struct sock *sk, long timeo);
79 static void sctp_destruct_sock(struct sock *sk);
80 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
81 					union sctp_addr *addr, int len);
82 static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
83 static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
84 static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
85 static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
86 static int sctp_send_asconf(struct sctp_association *asoc,
87 			    struct sctp_chunk *chunk);
88 static int sctp_do_bind(struct sock *, union sctp_addr *, int);
89 static int sctp_autobind(struct sock *sk);
90 static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
91 			     struct sctp_association *assoc,
92 			     enum sctp_socket_type type);
93 
94 static unsigned long sctp_memory_pressure;
95 static atomic_long_t sctp_memory_allocated;
96 struct percpu_counter sctp_sockets_allocated;
97 
98 static void sctp_enter_memory_pressure(struct sock *sk)
99 {
100 	sctp_memory_pressure = 1;
101 }
102 
103 
104 /* Get the sndbuf space available at the time on the association.  */
105 static inline int sctp_wspace(struct sctp_association *asoc)
106 {
107 	struct sock *sk = asoc->base.sk;
108 
109 	return asoc->ep->sndbuf_policy ? sk->sk_sndbuf - asoc->sndbuf_used
110 				       : sk_stream_wspace(sk);
111 }
112 
113 /* Increment the used sndbuf space count of the corresponding association by
114  * the size of the outgoing data chunk.
115  * Also, set the skb destructor for sndbuf accounting later.
116  *
117  * Since it is always 1-1 between chunk and skb, and also a new skb is always
118  * allocated for chunk bundling in sctp_packet_transmit(), we can use the
119  * destructor in the data chunk skb for the purpose of the sndbuf space
120  * tracking.
121  */
122 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
123 {
124 	struct sctp_association *asoc = chunk->asoc;
125 	struct sock *sk = asoc->base.sk;
126 
127 	/* The sndbuf space is tracked per association.  */
128 	sctp_association_hold(asoc);
129 
130 	if (chunk->shkey)
131 		sctp_auth_shkey_hold(chunk->shkey);
132 
133 	skb_set_owner_w(chunk->skb, sk);
134 
135 	chunk->skb->destructor = sctp_wfree;
136 	/* Save the chunk pointer in skb for sctp_wfree to use later.  */
137 	skb_shinfo(chunk->skb)->destructor_arg = chunk;
138 
139 	refcount_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
140 	asoc->sndbuf_used += chunk->skb->truesize + sizeof(struct sctp_chunk);
141 	sk->sk_wmem_queued += chunk->skb->truesize + sizeof(struct sctp_chunk);
142 	sk_mem_charge(sk, chunk->skb->truesize);
143 }
144 
145 static void sctp_clear_owner_w(struct sctp_chunk *chunk)
146 {
147 	skb_orphan(chunk->skb);
148 }
149 
150 static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
151 				       void (*cb)(struct sctp_chunk *))
152 
153 {
154 	struct sctp_outq *q = &asoc->outqueue;
155 	struct sctp_transport *t;
156 	struct sctp_chunk *chunk;
157 
158 	list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
159 		list_for_each_entry(chunk, &t->transmitted, transmitted_list)
160 			cb(chunk);
161 
162 	list_for_each_entry(chunk, &q->retransmit, transmitted_list)
163 		cb(chunk);
164 
165 	list_for_each_entry(chunk, &q->sacked, transmitted_list)
166 		cb(chunk);
167 
168 	list_for_each_entry(chunk, &q->abandoned, transmitted_list)
169 		cb(chunk);
170 
171 	list_for_each_entry(chunk, &q->out_chunk_list, list)
172 		cb(chunk);
173 }
174 
175 static void sctp_for_each_rx_skb(struct sctp_association *asoc, struct sock *sk,
176 				 void (*cb)(struct sk_buff *, struct sock *))
177 
178 {
179 	struct sk_buff *skb, *tmp;
180 
181 	sctp_skb_for_each(skb, &asoc->ulpq.lobby, tmp)
182 		cb(skb, sk);
183 
184 	sctp_skb_for_each(skb, &asoc->ulpq.reasm, tmp)
185 		cb(skb, sk);
186 
187 	sctp_skb_for_each(skb, &asoc->ulpq.reasm_uo, tmp)
188 		cb(skb, sk);
189 }
190 
191 /* Verify that this is a valid address. */
192 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
193 				   int len)
194 {
195 	struct sctp_af *af;
196 
197 	/* Verify basic sockaddr. */
198 	af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
199 	if (!af)
200 		return -EINVAL;
201 
202 	/* Is this a valid SCTP address?  */
203 	if (!af->addr_valid(addr, sctp_sk(sk), NULL))
204 		return -EINVAL;
205 
206 	if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
207 		return -EINVAL;
208 
209 	return 0;
210 }
211 
212 /* Look up the association by its id.  If this is not a UDP-style
213  * socket, the ID field is always ignored.
214  */
215 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
216 {
217 	struct sctp_association *asoc = NULL;
218 
219 	/* If this is not a UDP-style socket, assoc id should be ignored. */
220 	if (!sctp_style(sk, UDP)) {
221 		/* Return NULL if the socket state is not ESTABLISHED. It
222 		 * could be a TCP-style listening socket or a socket which
223 		 * hasn't yet called connect() to establish an association.
224 		 */
225 		if (!sctp_sstate(sk, ESTABLISHED) && !sctp_sstate(sk, CLOSING))
226 			return NULL;
227 
228 		/* Get the first and the only association from the list. */
229 		if (!list_empty(&sctp_sk(sk)->ep->asocs))
230 			asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
231 					  struct sctp_association, asocs);
232 		return asoc;
233 	}
234 
235 	/* Otherwise this is a UDP-style socket. */
236 	if (id <= SCTP_ALL_ASSOC)
237 		return NULL;
238 
239 	spin_lock_bh(&sctp_assocs_id_lock);
240 	asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
241 	if (asoc && (asoc->base.sk != sk || asoc->base.dead))
242 		asoc = NULL;
243 	spin_unlock_bh(&sctp_assocs_id_lock);
244 
245 	return asoc;
246 }
247 
248 /* Look up the transport from an address and an assoc id. If both address and
249  * id are specified, the associations matching the address and the id should be
250  * the same.
251  */
252 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
253 					      struct sockaddr_storage *addr,
254 					      sctp_assoc_t id)
255 {
256 	struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
257 	struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
258 	union sctp_addr *laddr = (union sctp_addr *)addr;
259 	struct sctp_transport *transport;
260 
261 	if (!af || sctp_verify_addr(sk, laddr, af->sockaddr_len))
262 		return NULL;
263 
264 	addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
265 					       laddr,
266 					       &transport);
267 
268 	if (!addr_asoc)
269 		return NULL;
270 
271 	id_asoc = sctp_id2assoc(sk, id);
272 	if (id_asoc && (id_asoc != addr_asoc))
273 		return NULL;
274 
275 	sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
276 						(union sctp_addr *)addr);
277 
278 	return transport;
279 }
280 
281 /* API 3.1.2 bind() - UDP Style Syntax
282  * The syntax of bind() is,
283  *
284  *   ret = bind(int sd, struct sockaddr *addr, int addrlen);
285  *
286  *   sd      - the socket descriptor returned by socket().
287  *   addr    - the address structure (struct sockaddr_in or struct
288  *             sockaddr_in6 [RFC 2553]),
289  *   addr_len - the size of the address structure.
290  */
291 static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
292 {
293 	int retval = 0;
294 
295 	lock_sock(sk);
296 
297 	pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
298 		 addr, addr_len);
299 
300 	/* Disallow binding twice. */
301 	if (!sctp_sk(sk)->ep->base.bind_addr.port)
302 		retval = sctp_do_bind(sk, (union sctp_addr *)addr,
303 				      addr_len);
304 	else
305 		retval = -EINVAL;
306 
307 	release_sock(sk);
308 
309 	return retval;
310 }
311 
312 static int sctp_get_port_local(struct sock *, union sctp_addr *);
313 
314 /* Verify this is a valid sockaddr. */
315 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
316 					union sctp_addr *addr, int len)
317 {
318 	struct sctp_af *af;
319 
320 	/* Check minimum size.  */
321 	if (len < sizeof (struct sockaddr))
322 		return NULL;
323 
324 	if (!opt->pf->af_supported(addr->sa.sa_family, opt))
325 		return NULL;
326 
327 	if (addr->sa.sa_family == AF_INET6) {
328 		if (len < SIN6_LEN_RFC2133)
329 			return NULL;
330 		/* V4 mapped address are really of AF_INET family */
331 		if (ipv6_addr_v4mapped(&addr->v6.sin6_addr) &&
332 		    !opt->pf->af_supported(AF_INET, opt))
333 			return NULL;
334 	}
335 
336 	/* If we get this far, af is valid. */
337 	af = sctp_get_af_specific(addr->sa.sa_family);
338 
339 	if (len < af->sockaddr_len)
340 		return NULL;
341 
342 	return af;
343 }
344 
345 /* Bind a local address either to an endpoint or to an association.  */
346 static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
347 {
348 	struct net *net = sock_net(sk);
349 	struct sctp_sock *sp = sctp_sk(sk);
350 	struct sctp_endpoint *ep = sp->ep;
351 	struct sctp_bind_addr *bp = &ep->base.bind_addr;
352 	struct sctp_af *af;
353 	unsigned short snum;
354 	int ret = 0;
355 
356 	/* Common sockaddr verification. */
357 	af = sctp_sockaddr_af(sp, addr, len);
358 	if (!af) {
359 		pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
360 			 __func__, sk, addr, len);
361 		return -EINVAL;
362 	}
363 
364 	snum = ntohs(addr->v4.sin_port);
365 
366 	pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
367 		 __func__, sk, &addr->sa, bp->port, snum, len);
368 
369 	/* PF specific bind() address verification. */
370 	if (!sp->pf->bind_verify(sp, addr))
371 		return -EADDRNOTAVAIL;
372 
373 	/* We must either be unbound, or bind to the same port.
374 	 * It's OK to allow 0 ports if we are already bound.
375 	 * We'll just inhert an already bound port in this case
376 	 */
377 	if (bp->port) {
378 		if (!snum)
379 			snum = bp->port;
380 		else if (snum != bp->port) {
381 			pr_debug("%s: new port %d doesn't match existing port "
382 				 "%d\n", __func__, snum, bp->port);
383 			return -EINVAL;
384 		}
385 	}
386 
387 	if (snum && inet_port_requires_bind_service(net, snum) &&
388 	    !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
389 		return -EACCES;
390 
391 	/* See if the address matches any of the addresses we may have
392 	 * already bound before checking against other endpoints.
393 	 */
394 	if (sctp_bind_addr_match(bp, addr, sp))
395 		return -EINVAL;
396 
397 	/* Make sure we are allowed to bind here.
398 	 * The function sctp_get_port_local() does duplicate address
399 	 * detection.
400 	 */
401 	addr->v4.sin_port = htons(snum);
402 	if (sctp_get_port_local(sk, addr))
403 		return -EADDRINUSE;
404 
405 	/* Refresh ephemeral port.  */
406 	if (!bp->port)
407 		bp->port = inet_sk(sk)->inet_num;
408 
409 	/* Add the address to the bind address list.
410 	 * Use GFP_ATOMIC since BHs will be disabled.
411 	 */
412 	ret = sctp_add_bind_addr(bp, addr, af->sockaddr_len,
413 				 SCTP_ADDR_SRC, GFP_ATOMIC);
414 
415 	if (ret) {
416 		sctp_put_port(sk);
417 		return ret;
418 	}
419 	/* Copy back into socket for getsockname() use. */
420 	inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
421 	sp->pf->to_sk_saddr(addr, sk);
422 
423 	return ret;
424 }
425 
426  /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
427  *
428  * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
429  * at any one time.  If a sender, after sending an ASCONF chunk, decides
430  * it needs to transfer another ASCONF Chunk, it MUST wait until the
431  * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
432  * subsequent ASCONF. Note this restriction binds each side, so at any
433  * time two ASCONF may be in-transit on any given association (one sent
434  * from each endpoint).
435  */
436 static int sctp_send_asconf(struct sctp_association *asoc,
437 			    struct sctp_chunk *chunk)
438 {
439 	struct net 	*net = sock_net(asoc->base.sk);
440 	int		retval = 0;
441 
442 	/* If there is an outstanding ASCONF chunk, queue it for later
443 	 * transmission.
444 	 */
445 	if (asoc->addip_last_asconf) {
446 		list_add_tail(&chunk->list, &asoc->addip_chunk_list);
447 		goto out;
448 	}
449 
450 	/* Hold the chunk until an ASCONF_ACK is received. */
451 	sctp_chunk_hold(chunk);
452 	retval = sctp_primitive_ASCONF(net, asoc, chunk);
453 	if (retval)
454 		sctp_chunk_free(chunk);
455 	else
456 		asoc->addip_last_asconf = chunk;
457 
458 out:
459 	return retval;
460 }
461 
462 /* Add a list of addresses as bind addresses to local endpoint or
463  * association.
464  *
465  * Basically run through each address specified in the addrs/addrcnt
466  * array/length pair, determine if it is IPv6 or IPv4 and call
467  * sctp_do_bind() on it.
468  *
469  * If any of them fails, then the operation will be reversed and the
470  * ones that were added will be removed.
471  *
472  * Only sctp_setsockopt_bindx() is supposed to call this function.
473  */
474 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
475 {
476 	int cnt;
477 	int retval = 0;
478 	void *addr_buf;
479 	struct sockaddr *sa_addr;
480 	struct sctp_af *af;
481 
482 	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
483 		 addrs, addrcnt);
484 
485 	addr_buf = addrs;
486 	for (cnt = 0; cnt < addrcnt; cnt++) {
487 		/* The list may contain either IPv4 or IPv6 address;
488 		 * determine the address length for walking thru the list.
489 		 */
490 		sa_addr = addr_buf;
491 		af = sctp_get_af_specific(sa_addr->sa_family);
492 		if (!af) {
493 			retval = -EINVAL;
494 			goto err_bindx_add;
495 		}
496 
497 		retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
498 				      af->sockaddr_len);
499 
500 		addr_buf += af->sockaddr_len;
501 
502 err_bindx_add:
503 		if (retval < 0) {
504 			/* Failed. Cleanup the ones that have been added */
505 			if (cnt > 0)
506 				sctp_bindx_rem(sk, addrs, cnt);
507 			return retval;
508 		}
509 	}
510 
511 	return retval;
512 }
513 
514 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
515  * associations that are part of the endpoint indicating that a list of local
516  * addresses are added to the endpoint.
517  *
518  * If any of the addresses is already in the bind address list of the
519  * association, we do not send the chunk for that association.  But it will not
520  * affect other associations.
521  *
522  * Only sctp_setsockopt_bindx() is supposed to call this function.
523  */
524 static int sctp_send_asconf_add_ip(struct sock		*sk,
525 				   struct sockaddr	*addrs,
526 				   int 			addrcnt)
527 {
528 	struct sctp_sock		*sp;
529 	struct sctp_endpoint		*ep;
530 	struct sctp_association		*asoc;
531 	struct sctp_bind_addr		*bp;
532 	struct sctp_chunk		*chunk;
533 	struct sctp_sockaddr_entry	*laddr;
534 	union sctp_addr			*addr;
535 	union sctp_addr			saveaddr;
536 	void				*addr_buf;
537 	struct sctp_af			*af;
538 	struct list_head		*p;
539 	int 				i;
540 	int 				retval = 0;
541 
542 	sp = sctp_sk(sk);
543 	ep = sp->ep;
544 
545 	if (!ep->asconf_enable)
546 		return retval;
547 
548 	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
549 		 __func__, sk, addrs, addrcnt);
550 
551 	list_for_each_entry(asoc, &ep->asocs, asocs) {
552 		if (!asoc->peer.asconf_capable)
553 			continue;
554 
555 		if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
556 			continue;
557 
558 		if (!sctp_state(asoc, ESTABLISHED))
559 			continue;
560 
561 		/* Check if any address in the packed array of addresses is
562 		 * in the bind address list of the association. If so,
563 		 * do not send the asconf chunk to its peer, but continue with
564 		 * other associations.
565 		 */
566 		addr_buf = addrs;
567 		for (i = 0; i < addrcnt; i++) {
568 			addr = addr_buf;
569 			af = sctp_get_af_specific(addr->v4.sin_family);
570 			if (!af) {
571 				retval = -EINVAL;
572 				goto out;
573 			}
574 
575 			if (sctp_assoc_lookup_laddr(asoc, addr))
576 				break;
577 
578 			addr_buf += af->sockaddr_len;
579 		}
580 		if (i < addrcnt)
581 			continue;
582 
583 		/* Use the first valid address in bind addr list of
584 		 * association as Address Parameter of ASCONF CHUNK.
585 		 */
586 		bp = &asoc->base.bind_addr;
587 		p = bp->address_list.next;
588 		laddr = list_entry(p, struct sctp_sockaddr_entry, list);
589 		chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
590 						   addrcnt, SCTP_PARAM_ADD_IP);
591 		if (!chunk) {
592 			retval = -ENOMEM;
593 			goto out;
594 		}
595 
596 		/* Add the new addresses to the bind address list with
597 		 * use_as_src set to 0.
598 		 */
599 		addr_buf = addrs;
600 		for (i = 0; i < addrcnt; i++) {
601 			addr = addr_buf;
602 			af = sctp_get_af_specific(addr->v4.sin_family);
603 			memcpy(&saveaddr, addr, af->sockaddr_len);
604 			retval = sctp_add_bind_addr(bp, &saveaddr,
605 						    sizeof(saveaddr),
606 						    SCTP_ADDR_NEW, GFP_ATOMIC);
607 			addr_buf += af->sockaddr_len;
608 		}
609 		if (asoc->src_out_of_asoc_ok) {
610 			struct sctp_transport *trans;
611 
612 			list_for_each_entry(trans,
613 			    &asoc->peer.transport_addr_list, transports) {
614 				trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
615 				    2*asoc->pathmtu, 4380));
616 				trans->ssthresh = asoc->peer.i.a_rwnd;
617 				trans->rto = asoc->rto_initial;
618 				sctp_max_rto(asoc, trans);
619 				trans->rtt = trans->srtt = trans->rttvar = 0;
620 				/* Clear the source and route cache */
621 				sctp_transport_route(trans, NULL,
622 						     sctp_sk(asoc->base.sk));
623 			}
624 		}
625 		retval = sctp_send_asconf(asoc, chunk);
626 	}
627 
628 out:
629 	return retval;
630 }
631 
632 /* Remove a list of addresses from bind addresses list.  Do not remove the
633  * last address.
634  *
635  * Basically run through each address specified in the addrs/addrcnt
636  * array/length pair, determine if it is IPv6 or IPv4 and call
637  * sctp_del_bind() on it.
638  *
639  * If any of them fails, then the operation will be reversed and the
640  * ones that were removed will be added back.
641  *
642  * At least one address has to be left; if only one address is
643  * available, the operation will return -EBUSY.
644  *
645  * Only sctp_setsockopt_bindx() is supposed to call this function.
646  */
647 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
648 {
649 	struct sctp_sock *sp = sctp_sk(sk);
650 	struct sctp_endpoint *ep = sp->ep;
651 	int cnt;
652 	struct sctp_bind_addr *bp = &ep->base.bind_addr;
653 	int retval = 0;
654 	void *addr_buf;
655 	union sctp_addr *sa_addr;
656 	struct sctp_af *af;
657 
658 	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
659 		 __func__, sk, addrs, addrcnt);
660 
661 	addr_buf = addrs;
662 	for (cnt = 0; cnt < addrcnt; cnt++) {
663 		/* If the bind address list is empty or if there is only one
664 		 * bind address, there is nothing more to be removed (we need
665 		 * at least one address here).
666 		 */
667 		if (list_empty(&bp->address_list) ||
668 		    (sctp_list_single_entry(&bp->address_list))) {
669 			retval = -EBUSY;
670 			goto err_bindx_rem;
671 		}
672 
673 		sa_addr = addr_buf;
674 		af = sctp_get_af_specific(sa_addr->sa.sa_family);
675 		if (!af) {
676 			retval = -EINVAL;
677 			goto err_bindx_rem;
678 		}
679 
680 		if (!af->addr_valid(sa_addr, sp, NULL)) {
681 			retval = -EADDRNOTAVAIL;
682 			goto err_bindx_rem;
683 		}
684 
685 		if (sa_addr->v4.sin_port &&
686 		    sa_addr->v4.sin_port != htons(bp->port)) {
687 			retval = -EINVAL;
688 			goto err_bindx_rem;
689 		}
690 
691 		if (!sa_addr->v4.sin_port)
692 			sa_addr->v4.sin_port = htons(bp->port);
693 
694 		/* FIXME - There is probably a need to check if sk->sk_saddr and
695 		 * sk->sk_rcv_addr are currently set to one of the addresses to
696 		 * be removed. This is something which needs to be looked into
697 		 * when we are fixing the outstanding issues with multi-homing
698 		 * socket routing and failover schemes. Refer to comments in
699 		 * sctp_do_bind(). -daisy
700 		 */
701 		retval = sctp_del_bind_addr(bp, sa_addr);
702 
703 		addr_buf += af->sockaddr_len;
704 err_bindx_rem:
705 		if (retval < 0) {
706 			/* Failed. Add the ones that has been removed back */
707 			if (cnt > 0)
708 				sctp_bindx_add(sk, addrs, cnt);
709 			return retval;
710 		}
711 	}
712 
713 	return retval;
714 }
715 
716 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
717  * the associations that are part of the endpoint indicating that a list of
718  * local addresses are removed from the endpoint.
719  *
720  * If any of the addresses is already in the bind address list of the
721  * association, we do not send the chunk for that association.  But it will not
722  * affect other associations.
723  *
724  * Only sctp_setsockopt_bindx() is supposed to call this function.
725  */
726 static int sctp_send_asconf_del_ip(struct sock		*sk,
727 				   struct sockaddr	*addrs,
728 				   int			addrcnt)
729 {
730 	struct sctp_sock	*sp;
731 	struct sctp_endpoint	*ep;
732 	struct sctp_association	*asoc;
733 	struct sctp_transport	*transport;
734 	struct sctp_bind_addr	*bp;
735 	struct sctp_chunk	*chunk;
736 	union sctp_addr		*laddr;
737 	void			*addr_buf;
738 	struct sctp_af		*af;
739 	struct sctp_sockaddr_entry *saddr;
740 	int 			i;
741 	int 			retval = 0;
742 	int			stored = 0;
743 
744 	chunk = NULL;
745 	sp = sctp_sk(sk);
746 	ep = sp->ep;
747 
748 	if (!ep->asconf_enable)
749 		return retval;
750 
751 	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
752 		 __func__, sk, addrs, addrcnt);
753 
754 	list_for_each_entry(asoc, &ep->asocs, asocs) {
755 
756 		if (!asoc->peer.asconf_capable)
757 			continue;
758 
759 		if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
760 			continue;
761 
762 		if (!sctp_state(asoc, ESTABLISHED))
763 			continue;
764 
765 		/* Check if any address in the packed array of addresses is
766 		 * not present in the bind address list of the association.
767 		 * If so, do not send the asconf chunk to its peer, but
768 		 * continue with other associations.
769 		 */
770 		addr_buf = addrs;
771 		for (i = 0; i < addrcnt; i++) {
772 			laddr = addr_buf;
773 			af = sctp_get_af_specific(laddr->v4.sin_family);
774 			if (!af) {
775 				retval = -EINVAL;
776 				goto out;
777 			}
778 
779 			if (!sctp_assoc_lookup_laddr(asoc, laddr))
780 				break;
781 
782 			addr_buf += af->sockaddr_len;
783 		}
784 		if (i < addrcnt)
785 			continue;
786 
787 		/* Find one address in the association's bind address list
788 		 * that is not in the packed array of addresses. This is to
789 		 * make sure that we do not delete all the addresses in the
790 		 * association.
791 		 */
792 		bp = &asoc->base.bind_addr;
793 		laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
794 					       addrcnt, sp);
795 		if ((laddr == NULL) && (addrcnt == 1)) {
796 			if (asoc->asconf_addr_del_pending)
797 				continue;
798 			asoc->asconf_addr_del_pending =
799 			    kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
800 			if (asoc->asconf_addr_del_pending == NULL) {
801 				retval = -ENOMEM;
802 				goto out;
803 			}
804 			asoc->asconf_addr_del_pending->sa.sa_family =
805 				    addrs->sa_family;
806 			asoc->asconf_addr_del_pending->v4.sin_port =
807 				    htons(bp->port);
808 			if (addrs->sa_family == AF_INET) {
809 				struct sockaddr_in *sin;
810 
811 				sin = (struct sockaddr_in *)addrs;
812 				asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
813 			} else if (addrs->sa_family == AF_INET6) {
814 				struct sockaddr_in6 *sin6;
815 
816 				sin6 = (struct sockaddr_in6 *)addrs;
817 				asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
818 			}
819 
820 			pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
821 				 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
822 				 asoc->asconf_addr_del_pending);
823 
824 			asoc->src_out_of_asoc_ok = 1;
825 			stored = 1;
826 			goto skip_mkasconf;
827 		}
828 
829 		if (laddr == NULL)
830 			return -EINVAL;
831 
832 		/* We do not need RCU protection throughout this loop
833 		 * because this is done under a socket lock from the
834 		 * setsockopt call.
835 		 */
836 		chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
837 						   SCTP_PARAM_DEL_IP);
838 		if (!chunk) {
839 			retval = -ENOMEM;
840 			goto out;
841 		}
842 
843 skip_mkasconf:
844 		/* Reset use_as_src flag for the addresses in the bind address
845 		 * list that are to be deleted.
846 		 */
847 		addr_buf = addrs;
848 		for (i = 0; i < addrcnt; i++) {
849 			laddr = addr_buf;
850 			af = sctp_get_af_specific(laddr->v4.sin_family);
851 			list_for_each_entry(saddr, &bp->address_list, list) {
852 				if (sctp_cmp_addr_exact(&saddr->a, laddr))
853 					saddr->state = SCTP_ADDR_DEL;
854 			}
855 			addr_buf += af->sockaddr_len;
856 		}
857 
858 		/* Update the route and saddr entries for all the transports
859 		 * as some of the addresses in the bind address list are
860 		 * about to be deleted and cannot be used as source addresses.
861 		 */
862 		list_for_each_entry(transport, &asoc->peer.transport_addr_list,
863 					transports) {
864 			sctp_transport_route(transport, NULL,
865 					     sctp_sk(asoc->base.sk));
866 		}
867 
868 		if (stored)
869 			/* We don't need to transmit ASCONF */
870 			continue;
871 		retval = sctp_send_asconf(asoc, chunk);
872 	}
873 out:
874 	return retval;
875 }
876 
877 /* set addr events to assocs in the endpoint.  ep and addr_wq must be locked */
878 int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
879 {
880 	struct sock *sk = sctp_opt2sk(sp);
881 	union sctp_addr *addr;
882 	struct sctp_af *af;
883 
884 	/* It is safe to write port space in caller. */
885 	addr = &addrw->a;
886 	addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
887 	af = sctp_get_af_specific(addr->sa.sa_family);
888 	if (!af)
889 		return -EINVAL;
890 	if (sctp_verify_addr(sk, addr, af->sockaddr_len))
891 		return -EINVAL;
892 
893 	if (addrw->state == SCTP_ADDR_NEW)
894 		return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
895 	else
896 		return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
897 }
898 
899 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
900  *
901  * API 8.1
902  * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
903  *                int flags);
904  *
905  * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
906  * If the sd is an IPv6 socket, the addresses passed can either be IPv4
907  * or IPv6 addresses.
908  *
909  * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
910  * Section 3.1.2 for this usage.
911  *
912  * addrs is a pointer to an array of one or more socket addresses. Each
913  * address is contained in its appropriate structure (i.e. struct
914  * sockaddr_in or struct sockaddr_in6) the family of the address type
915  * must be used to distinguish the address length (note that this
916  * representation is termed a "packed array" of addresses). The caller
917  * specifies the number of addresses in the array with addrcnt.
918  *
919  * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
920  * -1, and sets errno to the appropriate error code.
921  *
922  * For SCTP, the port given in each socket address must be the same, or
923  * sctp_bindx() will fail, setting errno to EINVAL.
924  *
925  * The flags parameter is formed from the bitwise OR of zero or more of
926  * the following currently defined flags:
927  *
928  * SCTP_BINDX_ADD_ADDR
929  *
930  * SCTP_BINDX_REM_ADDR
931  *
932  * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
933  * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
934  * addresses from the association. The two flags are mutually exclusive;
935  * if both are given, sctp_bindx() will fail with EINVAL. A caller may
936  * not remove all addresses from an association; sctp_bindx() will
937  * reject such an attempt with EINVAL.
938  *
939  * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
940  * additional addresses with an endpoint after calling bind().  Or use
941  * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
942  * socket is associated with so that no new association accepted will be
943  * associated with those addresses. If the endpoint supports dynamic
944  * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
945  * endpoint to send the appropriate message to the peer to change the
946  * peers address lists.
947  *
948  * Adding and removing addresses from a connected association is
949  * optional functionality. Implementations that do not support this
950  * functionality should return EOPNOTSUPP.
951  *
952  * Basically do nothing but copying the addresses from user to kernel
953  * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
954  * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
955  * from userspace.
956  *
957  * On exit there is no need to do sockfd_put(), sys_setsockopt() does
958  * it.
959  *
960  * sk        The sk of the socket
961  * addrs     The pointer to the addresses in user land
962  * addrssize Size of the addrs buffer
963  * op        Operation to perform (add or remove, see the flags of
964  *           sctp_bindx)
965  *
966  * Returns 0 if ok, <0 errno code on error.
967  */
968 static int sctp_setsockopt_bindx(struct sock *sk,
969 				 struct sockaddr __user *addrs,
970 				 int addrs_size, int op)
971 {
972 	struct sockaddr *kaddrs;
973 	int err;
974 	int addrcnt = 0;
975 	int walk_size = 0;
976 	struct sockaddr *sa_addr;
977 	void *addr_buf;
978 	struct sctp_af *af;
979 
980 	pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
981 		 __func__, sk, addrs, addrs_size, op);
982 
983 	if (unlikely(addrs_size <= 0))
984 		return -EINVAL;
985 
986 	kaddrs = memdup_user(addrs, addrs_size);
987 	if (IS_ERR(kaddrs))
988 		return PTR_ERR(kaddrs);
989 
990 	/* Walk through the addrs buffer and count the number of addresses. */
991 	addr_buf = kaddrs;
992 	while (walk_size < addrs_size) {
993 		if (walk_size + sizeof(sa_family_t) > addrs_size) {
994 			kfree(kaddrs);
995 			return -EINVAL;
996 		}
997 
998 		sa_addr = addr_buf;
999 		af = sctp_get_af_specific(sa_addr->sa_family);
1000 
1001 		/* If the address family is not supported or if this address
1002 		 * causes the address buffer to overflow return EINVAL.
1003 		 */
1004 		if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1005 			kfree(kaddrs);
1006 			return -EINVAL;
1007 		}
1008 		addrcnt++;
1009 		addr_buf += af->sockaddr_len;
1010 		walk_size += af->sockaddr_len;
1011 	}
1012 
1013 	/* Do the work. */
1014 	switch (op) {
1015 	case SCTP_BINDX_ADD_ADDR:
1016 		/* Allow security module to validate bindx addresses. */
1017 		err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_BINDX_ADD,
1018 						 (struct sockaddr *)kaddrs,
1019 						 addrs_size);
1020 		if (err)
1021 			goto out;
1022 		err = sctp_bindx_add(sk, kaddrs, addrcnt);
1023 		if (err)
1024 			goto out;
1025 		err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
1026 		break;
1027 
1028 	case SCTP_BINDX_REM_ADDR:
1029 		err = sctp_bindx_rem(sk, kaddrs, addrcnt);
1030 		if (err)
1031 			goto out;
1032 		err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
1033 		break;
1034 
1035 	default:
1036 		err = -EINVAL;
1037 		break;
1038 	}
1039 
1040 out:
1041 	kfree(kaddrs);
1042 
1043 	return err;
1044 }
1045 
1046 static int sctp_connect_new_asoc(struct sctp_endpoint *ep,
1047 				 const union sctp_addr *daddr,
1048 				 const struct sctp_initmsg *init,
1049 				 struct sctp_transport **tp)
1050 {
1051 	struct sctp_association *asoc;
1052 	struct sock *sk = ep->base.sk;
1053 	struct net *net = sock_net(sk);
1054 	enum sctp_scope scope;
1055 	int err;
1056 
1057 	if (sctp_endpoint_is_peeled_off(ep, daddr))
1058 		return -EADDRNOTAVAIL;
1059 
1060 	if (!ep->base.bind_addr.port) {
1061 		if (sctp_autobind(sk))
1062 			return -EAGAIN;
1063 	} else {
1064 		if (inet_port_requires_bind_service(net, ep->base.bind_addr.port) &&
1065 		    !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
1066 			return -EACCES;
1067 	}
1068 
1069 	scope = sctp_scope(daddr);
1070 	asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1071 	if (!asoc)
1072 		return -ENOMEM;
1073 
1074 	err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1075 	if (err < 0)
1076 		goto free;
1077 
1078 	*tp = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1079 	if (!*tp) {
1080 		err = -ENOMEM;
1081 		goto free;
1082 	}
1083 
1084 	if (!init)
1085 		return 0;
1086 
1087 	if (init->sinit_num_ostreams) {
1088 		__u16 outcnt = init->sinit_num_ostreams;
1089 
1090 		asoc->c.sinit_num_ostreams = outcnt;
1091 		/* outcnt has been changed, need to re-init stream */
1092 		err = sctp_stream_init(&asoc->stream, outcnt, 0, GFP_KERNEL);
1093 		if (err)
1094 			goto free;
1095 	}
1096 
1097 	if (init->sinit_max_instreams)
1098 		asoc->c.sinit_max_instreams = init->sinit_max_instreams;
1099 
1100 	if (init->sinit_max_attempts)
1101 		asoc->max_init_attempts = init->sinit_max_attempts;
1102 
1103 	if (init->sinit_max_init_timeo)
1104 		asoc->max_init_timeo =
1105 			msecs_to_jiffies(init->sinit_max_init_timeo);
1106 
1107 	return 0;
1108 free:
1109 	sctp_association_free(asoc);
1110 	return err;
1111 }
1112 
1113 static int sctp_connect_add_peer(struct sctp_association *asoc,
1114 				 union sctp_addr *daddr, int addr_len)
1115 {
1116 	struct sctp_endpoint *ep = asoc->ep;
1117 	struct sctp_association *old;
1118 	struct sctp_transport *t;
1119 	int err;
1120 
1121 	err = sctp_verify_addr(ep->base.sk, daddr, addr_len);
1122 	if (err)
1123 		return err;
1124 
1125 	old = sctp_endpoint_lookup_assoc(ep, daddr, &t);
1126 	if (old && old != asoc)
1127 		return old->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1128 							    : -EALREADY;
1129 
1130 	if (sctp_endpoint_is_peeled_off(ep, daddr))
1131 		return -EADDRNOTAVAIL;
1132 
1133 	t = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1134 	if (!t)
1135 		return -ENOMEM;
1136 
1137 	return 0;
1138 }
1139 
1140 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1141  *
1142  * Common routine for handling connect() and sctp_connectx().
1143  * Connect will come in with just a single address.
1144  */
1145 static int __sctp_connect(struct sock *sk, struct sockaddr *kaddrs,
1146 			  int addrs_size, int flags, sctp_assoc_t *assoc_id)
1147 {
1148 	struct sctp_sock *sp = sctp_sk(sk);
1149 	struct sctp_endpoint *ep = sp->ep;
1150 	struct sctp_transport *transport;
1151 	struct sctp_association *asoc;
1152 	void *addr_buf = kaddrs;
1153 	union sctp_addr *daddr;
1154 	struct sctp_af *af;
1155 	int walk_size, err;
1156 	long timeo;
1157 
1158 	if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
1159 	    (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)))
1160 		return -EISCONN;
1161 
1162 	daddr = addr_buf;
1163 	af = sctp_get_af_specific(daddr->sa.sa_family);
1164 	if (!af || af->sockaddr_len > addrs_size)
1165 		return -EINVAL;
1166 
1167 	err = sctp_verify_addr(sk, daddr, af->sockaddr_len);
1168 	if (err)
1169 		return err;
1170 
1171 	asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1172 	if (asoc)
1173 		return asoc->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1174 							     : -EALREADY;
1175 
1176 	err = sctp_connect_new_asoc(ep, daddr, NULL, &transport);
1177 	if (err)
1178 		return err;
1179 	asoc = transport->asoc;
1180 
1181 	addr_buf += af->sockaddr_len;
1182 	walk_size = af->sockaddr_len;
1183 	while (walk_size < addrs_size) {
1184 		err = -EINVAL;
1185 		if (walk_size + sizeof(sa_family_t) > addrs_size)
1186 			goto out_free;
1187 
1188 		daddr = addr_buf;
1189 		af = sctp_get_af_specific(daddr->sa.sa_family);
1190 		if (!af || af->sockaddr_len + walk_size > addrs_size)
1191 			goto out_free;
1192 
1193 		if (asoc->peer.port != ntohs(daddr->v4.sin_port))
1194 			goto out_free;
1195 
1196 		err = sctp_connect_add_peer(asoc, daddr, af->sockaddr_len);
1197 		if (err)
1198 			goto out_free;
1199 
1200 		addr_buf  += af->sockaddr_len;
1201 		walk_size += af->sockaddr_len;
1202 	}
1203 
1204 	/* In case the user of sctp_connectx() wants an association
1205 	 * id back, assign one now.
1206 	 */
1207 	if (assoc_id) {
1208 		err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1209 		if (err < 0)
1210 			goto out_free;
1211 	}
1212 
1213 	err = sctp_primitive_ASSOCIATE(sock_net(sk), asoc, NULL);
1214 	if (err < 0)
1215 		goto out_free;
1216 
1217 	/* Initialize sk's dport and daddr for getpeername() */
1218 	inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1219 	sp->pf->to_sk_daddr(daddr, sk);
1220 	sk->sk_err = 0;
1221 
1222 	if (assoc_id)
1223 		*assoc_id = asoc->assoc_id;
1224 
1225 	timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
1226 	return sctp_wait_for_connect(asoc, &timeo);
1227 
1228 out_free:
1229 	pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1230 		 __func__, asoc, kaddrs, err);
1231 	sctp_association_free(asoc);
1232 	return err;
1233 }
1234 
1235 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1236  *
1237  * API 8.9
1238  * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1239  * 			sctp_assoc_t *asoc);
1240  *
1241  * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1242  * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1243  * or IPv6 addresses.
1244  *
1245  * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1246  * Section 3.1.2 for this usage.
1247  *
1248  * addrs is a pointer to an array of one or more socket addresses. Each
1249  * address is contained in its appropriate structure (i.e. struct
1250  * sockaddr_in or struct sockaddr_in6) the family of the address type
1251  * must be used to distengish the address length (note that this
1252  * representation is termed a "packed array" of addresses). The caller
1253  * specifies the number of addresses in the array with addrcnt.
1254  *
1255  * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1256  * the association id of the new association.  On failure, sctp_connectx()
1257  * returns -1, and sets errno to the appropriate error code.  The assoc_id
1258  * is not touched by the kernel.
1259  *
1260  * For SCTP, the port given in each socket address must be the same, or
1261  * sctp_connectx() will fail, setting errno to EINVAL.
1262  *
1263  * An application can use sctp_connectx to initiate an association with
1264  * an endpoint that is multi-homed.  Much like sctp_bindx() this call
1265  * allows a caller to specify multiple addresses at which a peer can be
1266  * reached.  The way the SCTP stack uses the list of addresses to set up
1267  * the association is implementation dependent.  This function only
1268  * specifies that the stack will try to make use of all the addresses in
1269  * the list when needed.
1270  *
1271  * Note that the list of addresses passed in is only used for setting up
1272  * the association.  It does not necessarily equal the set of addresses
1273  * the peer uses for the resulting association.  If the caller wants to
1274  * find out the set of peer addresses, it must use sctp_getpaddrs() to
1275  * retrieve them after the association has been set up.
1276  *
1277  * Basically do nothing but copying the addresses from user to kernel
1278  * land and invoking either sctp_connectx(). This is used for tunneling
1279  * the sctp_connectx() request through sctp_setsockopt() from userspace.
1280  *
1281  * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1282  * it.
1283  *
1284  * sk        The sk of the socket
1285  * addrs     The pointer to the addresses in user land
1286  * addrssize Size of the addrs buffer
1287  *
1288  * Returns >=0 if ok, <0 errno code on error.
1289  */
1290 static int __sctp_setsockopt_connectx(struct sock *sk,
1291 				      struct sockaddr __user *addrs,
1292 				      int addrs_size,
1293 				      sctp_assoc_t *assoc_id)
1294 {
1295 	struct sockaddr *kaddrs;
1296 	int err = 0, flags = 0;
1297 
1298 	pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1299 		 __func__, sk, addrs, addrs_size);
1300 
1301 	/* make sure the 1st addr's sa_family is accessible later */
1302 	if (unlikely(addrs_size < sizeof(sa_family_t)))
1303 		return -EINVAL;
1304 
1305 	kaddrs = memdup_user(addrs, addrs_size);
1306 	if (IS_ERR(kaddrs))
1307 		return PTR_ERR(kaddrs);
1308 
1309 	/* Allow security module to validate connectx addresses. */
1310 	err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_CONNECTX,
1311 					 (struct sockaddr *)kaddrs,
1312 					  addrs_size);
1313 	if (err)
1314 		goto out_free;
1315 
1316 	/* in-kernel sockets don't generally have a file allocated to them
1317 	 * if all they do is call sock_create_kern().
1318 	 */
1319 	if (sk->sk_socket->file)
1320 		flags = sk->sk_socket->file->f_flags;
1321 
1322 	err = __sctp_connect(sk, kaddrs, addrs_size, flags, assoc_id);
1323 
1324 out_free:
1325 	kfree(kaddrs);
1326 
1327 	return err;
1328 }
1329 
1330 /*
1331  * This is an older interface.  It's kept for backward compatibility
1332  * to the option that doesn't provide association id.
1333  */
1334 static int sctp_setsockopt_connectx_old(struct sock *sk,
1335 					struct sockaddr __user *addrs,
1336 					int addrs_size)
1337 {
1338 	return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1339 }
1340 
1341 /*
1342  * New interface for the API.  The since the API is done with a socket
1343  * option, to make it simple we feed back the association id is as a return
1344  * indication to the call.  Error is always negative and association id is
1345  * always positive.
1346  */
1347 static int sctp_setsockopt_connectx(struct sock *sk,
1348 				    struct sockaddr __user *addrs,
1349 				    int addrs_size)
1350 {
1351 	sctp_assoc_t assoc_id = 0;
1352 	int err = 0;
1353 
1354 	err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1355 
1356 	if (err)
1357 		return err;
1358 	else
1359 		return assoc_id;
1360 }
1361 
1362 /*
1363  * New (hopefully final) interface for the API.
1364  * We use the sctp_getaddrs_old structure so that use-space library
1365  * can avoid any unnecessary allocations. The only different part
1366  * is that we store the actual length of the address buffer into the
1367  * addrs_num structure member. That way we can re-use the existing
1368  * code.
1369  */
1370 #ifdef CONFIG_COMPAT
1371 struct compat_sctp_getaddrs_old {
1372 	sctp_assoc_t	assoc_id;
1373 	s32		addr_num;
1374 	compat_uptr_t	addrs;		/* struct sockaddr * */
1375 };
1376 #endif
1377 
1378 static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1379 				     char __user *optval,
1380 				     int __user *optlen)
1381 {
1382 	struct sctp_getaddrs_old param;
1383 	sctp_assoc_t assoc_id = 0;
1384 	int err = 0;
1385 
1386 #ifdef CONFIG_COMPAT
1387 	if (in_compat_syscall()) {
1388 		struct compat_sctp_getaddrs_old param32;
1389 
1390 		if (len < sizeof(param32))
1391 			return -EINVAL;
1392 		if (copy_from_user(&param32, optval, sizeof(param32)))
1393 			return -EFAULT;
1394 
1395 		param.assoc_id = param32.assoc_id;
1396 		param.addr_num = param32.addr_num;
1397 		param.addrs = compat_ptr(param32.addrs);
1398 	} else
1399 #endif
1400 	{
1401 		if (len < sizeof(param))
1402 			return -EINVAL;
1403 		if (copy_from_user(&param, optval, sizeof(param)))
1404 			return -EFAULT;
1405 	}
1406 
1407 	err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
1408 					 param.addrs, param.addr_num,
1409 					 &assoc_id);
1410 	if (err == 0 || err == -EINPROGRESS) {
1411 		if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1412 			return -EFAULT;
1413 		if (put_user(sizeof(assoc_id), optlen))
1414 			return -EFAULT;
1415 	}
1416 
1417 	return err;
1418 }
1419 
1420 /* API 3.1.4 close() - UDP Style Syntax
1421  * Applications use close() to perform graceful shutdown (as described in
1422  * Section 10.1 of [SCTP]) on ALL the associations currently represented
1423  * by a UDP-style socket.
1424  *
1425  * The syntax is
1426  *
1427  *   ret = close(int sd);
1428  *
1429  *   sd      - the socket descriptor of the associations to be closed.
1430  *
1431  * To gracefully shutdown a specific association represented by the
1432  * UDP-style socket, an application should use the sendmsg() call,
1433  * passing no user data, but including the appropriate flag in the
1434  * ancillary data (see Section xxxx).
1435  *
1436  * If sd in the close() call is a branched-off socket representing only
1437  * one association, the shutdown is performed on that association only.
1438  *
1439  * 4.1.6 close() - TCP Style Syntax
1440  *
1441  * Applications use close() to gracefully close down an association.
1442  *
1443  * The syntax is:
1444  *
1445  *    int close(int sd);
1446  *
1447  *      sd      - the socket descriptor of the association to be closed.
1448  *
1449  * After an application calls close() on a socket descriptor, no further
1450  * socket operations will succeed on that descriptor.
1451  *
1452  * API 7.1.4 SO_LINGER
1453  *
1454  * An application using the TCP-style socket can use this option to
1455  * perform the SCTP ABORT primitive.  The linger option structure is:
1456  *
1457  *  struct  linger {
1458  *     int     l_onoff;                // option on/off
1459  *     int     l_linger;               // linger time
1460  * };
1461  *
1462  * To enable the option, set l_onoff to 1.  If the l_linger value is set
1463  * to 0, calling close() is the same as the ABORT primitive.  If the
1464  * value is set to a negative value, the setsockopt() call will return
1465  * an error.  If the value is set to a positive value linger_time, the
1466  * close() can be blocked for at most linger_time ms.  If the graceful
1467  * shutdown phase does not finish during this period, close() will
1468  * return but the graceful shutdown phase continues in the system.
1469  */
1470 static void sctp_close(struct sock *sk, long timeout)
1471 {
1472 	struct net *net = sock_net(sk);
1473 	struct sctp_endpoint *ep;
1474 	struct sctp_association *asoc;
1475 	struct list_head *pos, *temp;
1476 	unsigned int data_was_unread;
1477 
1478 	pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1479 
1480 	lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1481 	sk->sk_shutdown = SHUTDOWN_MASK;
1482 	inet_sk_set_state(sk, SCTP_SS_CLOSING);
1483 
1484 	ep = sctp_sk(sk)->ep;
1485 
1486 	/* Clean up any skbs sitting on the receive queue.  */
1487 	data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1488 	data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1489 
1490 	/* Walk all associations on an endpoint.  */
1491 	list_for_each_safe(pos, temp, &ep->asocs) {
1492 		asoc = list_entry(pos, struct sctp_association, asocs);
1493 
1494 		if (sctp_style(sk, TCP)) {
1495 			/* A closed association can still be in the list if
1496 			 * it belongs to a TCP-style listening socket that is
1497 			 * not yet accepted. If so, free it. If not, send an
1498 			 * ABORT or SHUTDOWN based on the linger options.
1499 			 */
1500 			if (sctp_state(asoc, CLOSED)) {
1501 				sctp_association_free(asoc);
1502 				continue;
1503 			}
1504 		}
1505 
1506 		if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1507 		    !skb_queue_empty(&asoc->ulpq.reasm) ||
1508 		    !skb_queue_empty(&asoc->ulpq.reasm_uo) ||
1509 		    (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1510 			struct sctp_chunk *chunk;
1511 
1512 			chunk = sctp_make_abort_user(asoc, NULL, 0);
1513 			sctp_primitive_ABORT(net, asoc, chunk);
1514 		} else
1515 			sctp_primitive_SHUTDOWN(net, asoc, NULL);
1516 	}
1517 
1518 	/* On a TCP-style socket, block for at most linger_time if set. */
1519 	if (sctp_style(sk, TCP) && timeout)
1520 		sctp_wait_for_close(sk, timeout);
1521 
1522 	/* This will run the backlog queue.  */
1523 	release_sock(sk);
1524 
1525 	/* Supposedly, no process has access to the socket, but
1526 	 * the net layers still may.
1527 	 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1528 	 * held and that should be grabbed before socket lock.
1529 	 */
1530 	spin_lock_bh(&net->sctp.addr_wq_lock);
1531 	bh_lock_sock_nested(sk);
1532 
1533 	/* Hold the sock, since sk_common_release() will put sock_put()
1534 	 * and we have just a little more cleanup.
1535 	 */
1536 	sock_hold(sk);
1537 	sk_common_release(sk);
1538 
1539 	bh_unlock_sock(sk);
1540 	spin_unlock_bh(&net->sctp.addr_wq_lock);
1541 
1542 	sock_put(sk);
1543 
1544 	SCTP_DBG_OBJCNT_DEC(sock);
1545 }
1546 
1547 /* Handle EPIPE error. */
1548 static int sctp_error(struct sock *sk, int flags, int err)
1549 {
1550 	if (err == -EPIPE)
1551 		err = sock_error(sk) ? : -EPIPE;
1552 	if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1553 		send_sig(SIGPIPE, current, 0);
1554 	return err;
1555 }
1556 
1557 /* API 3.1.3 sendmsg() - UDP Style Syntax
1558  *
1559  * An application uses sendmsg() and recvmsg() calls to transmit data to
1560  * and receive data from its peer.
1561  *
1562  *  ssize_t sendmsg(int socket, const struct msghdr *message,
1563  *                  int flags);
1564  *
1565  *  socket  - the socket descriptor of the endpoint.
1566  *  message - pointer to the msghdr structure which contains a single
1567  *            user message and possibly some ancillary data.
1568  *
1569  *            See Section 5 for complete description of the data
1570  *            structures.
1571  *
1572  *  flags   - flags sent or received with the user message, see Section
1573  *            5 for complete description of the flags.
1574  *
1575  * Note:  This function could use a rewrite especially when explicit
1576  * connect support comes in.
1577  */
1578 /* BUG:  We do not implement the equivalent of sk_stream_wait_memory(). */
1579 
1580 static int sctp_msghdr_parse(const struct msghdr *msg,
1581 			     struct sctp_cmsgs *cmsgs);
1582 
1583 static int sctp_sendmsg_parse(struct sock *sk, struct sctp_cmsgs *cmsgs,
1584 			      struct sctp_sndrcvinfo *srinfo,
1585 			      const struct msghdr *msg, size_t msg_len)
1586 {
1587 	__u16 sflags;
1588 	int err;
1589 
1590 	if (sctp_sstate(sk, LISTENING) && sctp_style(sk, TCP))
1591 		return -EPIPE;
1592 
1593 	if (msg_len > sk->sk_sndbuf)
1594 		return -EMSGSIZE;
1595 
1596 	memset(cmsgs, 0, sizeof(*cmsgs));
1597 	err = sctp_msghdr_parse(msg, cmsgs);
1598 	if (err) {
1599 		pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1600 		return err;
1601 	}
1602 
1603 	memset(srinfo, 0, sizeof(*srinfo));
1604 	if (cmsgs->srinfo) {
1605 		srinfo->sinfo_stream = cmsgs->srinfo->sinfo_stream;
1606 		srinfo->sinfo_flags = cmsgs->srinfo->sinfo_flags;
1607 		srinfo->sinfo_ppid = cmsgs->srinfo->sinfo_ppid;
1608 		srinfo->sinfo_context = cmsgs->srinfo->sinfo_context;
1609 		srinfo->sinfo_assoc_id = cmsgs->srinfo->sinfo_assoc_id;
1610 		srinfo->sinfo_timetolive = cmsgs->srinfo->sinfo_timetolive;
1611 	}
1612 
1613 	if (cmsgs->sinfo) {
1614 		srinfo->sinfo_stream = cmsgs->sinfo->snd_sid;
1615 		srinfo->sinfo_flags = cmsgs->sinfo->snd_flags;
1616 		srinfo->sinfo_ppid = cmsgs->sinfo->snd_ppid;
1617 		srinfo->sinfo_context = cmsgs->sinfo->snd_context;
1618 		srinfo->sinfo_assoc_id = cmsgs->sinfo->snd_assoc_id;
1619 	}
1620 
1621 	if (cmsgs->prinfo) {
1622 		srinfo->sinfo_timetolive = cmsgs->prinfo->pr_value;
1623 		SCTP_PR_SET_POLICY(srinfo->sinfo_flags,
1624 				   cmsgs->prinfo->pr_policy);
1625 	}
1626 
1627 	sflags = srinfo->sinfo_flags;
1628 	if (!sflags && msg_len)
1629 		return 0;
1630 
1631 	if (sctp_style(sk, TCP) && (sflags & (SCTP_EOF | SCTP_ABORT)))
1632 		return -EINVAL;
1633 
1634 	if (((sflags & SCTP_EOF) && msg_len > 0) ||
1635 	    (!(sflags & (SCTP_EOF | SCTP_ABORT)) && msg_len == 0))
1636 		return -EINVAL;
1637 
1638 	if ((sflags & SCTP_ADDR_OVER) && !msg->msg_name)
1639 		return -EINVAL;
1640 
1641 	return 0;
1642 }
1643 
1644 static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
1645 				 struct sctp_cmsgs *cmsgs,
1646 				 union sctp_addr *daddr,
1647 				 struct sctp_transport **tp)
1648 {
1649 	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1650 	struct sctp_association *asoc;
1651 	struct cmsghdr *cmsg;
1652 	__be32 flowinfo = 0;
1653 	struct sctp_af *af;
1654 	int err;
1655 
1656 	*tp = NULL;
1657 
1658 	if (sflags & (SCTP_EOF | SCTP_ABORT))
1659 		return -EINVAL;
1660 
1661 	if (sctp_style(sk, TCP) && (sctp_sstate(sk, ESTABLISHED) ||
1662 				    sctp_sstate(sk, CLOSING)))
1663 		return -EADDRNOTAVAIL;
1664 
1665 	/* Label connection socket for first association 1-to-many
1666 	 * style for client sequence socket()->sendmsg(). This
1667 	 * needs to be done before sctp_assoc_add_peer() as that will
1668 	 * set up the initial packet that needs to account for any
1669 	 * security ip options (CIPSO/CALIPSO) added to the packet.
1670 	 */
1671 	af = sctp_get_af_specific(daddr->sa.sa_family);
1672 	if (!af)
1673 		return -EINVAL;
1674 	err = security_sctp_bind_connect(sk, SCTP_SENDMSG_CONNECT,
1675 					 (struct sockaddr *)daddr,
1676 					 af->sockaddr_len);
1677 	if (err < 0)
1678 		return err;
1679 
1680 	err = sctp_connect_new_asoc(ep, daddr, cmsgs->init, tp);
1681 	if (err)
1682 		return err;
1683 	asoc = (*tp)->asoc;
1684 
1685 	if (!cmsgs->addrs_msg)
1686 		return 0;
1687 
1688 	if (daddr->sa.sa_family == AF_INET6)
1689 		flowinfo = daddr->v6.sin6_flowinfo;
1690 
1691 	/* sendv addr list parse */
1692 	for_each_cmsghdr(cmsg, cmsgs->addrs_msg) {
1693 		union sctp_addr _daddr;
1694 		int dlen;
1695 
1696 		if (cmsg->cmsg_level != IPPROTO_SCTP ||
1697 		    (cmsg->cmsg_type != SCTP_DSTADDRV4 &&
1698 		     cmsg->cmsg_type != SCTP_DSTADDRV6))
1699 			continue;
1700 
1701 		daddr = &_daddr;
1702 		memset(daddr, 0, sizeof(*daddr));
1703 		dlen = cmsg->cmsg_len - sizeof(struct cmsghdr);
1704 		if (cmsg->cmsg_type == SCTP_DSTADDRV4) {
1705 			if (dlen < sizeof(struct in_addr)) {
1706 				err = -EINVAL;
1707 				goto free;
1708 			}
1709 
1710 			dlen = sizeof(struct in_addr);
1711 			daddr->v4.sin_family = AF_INET;
1712 			daddr->v4.sin_port = htons(asoc->peer.port);
1713 			memcpy(&daddr->v4.sin_addr, CMSG_DATA(cmsg), dlen);
1714 		} else {
1715 			if (dlen < sizeof(struct in6_addr)) {
1716 				err = -EINVAL;
1717 				goto free;
1718 			}
1719 
1720 			dlen = sizeof(struct in6_addr);
1721 			daddr->v6.sin6_flowinfo = flowinfo;
1722 			daddr->v6.sin6_family = AF_INET6;
1723 			daddr->v6.sin6_port = htons(asoc->peer.port);
1724 			memcpy(&daddr->v6.sin6_addr, CMSG_DATA(cmsg), dlen);
1725 		}
1726 
1727 		err = sctp_connect_add_peer(asoc, daddr, sizeof(*daddr));
1728 		if (err)
1729 			goto free;
1730 	}
1731 
1732 	return 0;
1733 
1734 free:
1735 	sctp_association_free(asoc);
1736 	return err;
1737 }
1738 
1739 static int sctp_sendmsg_check_sflags(struct sctp_association *asoc,
1740 				     __u16 sflags, struct msghdr *msg,
1741 				     size_t msg_len)
1742 {
1743 	struct sock *sk = asoc->base.sk;
1744 	struct net *net = sock_net(sk);
1745 
1746 	if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP))
1747 		return -EPIPE;
1748 
1749 	if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP) &&
1750 	    !sctp_state(asoc, ESTABLISHED))
1751 		return 0;
1752 
1753 	if (sflags & SCTP_EOF) {
1754 		pr_debug("%s: shutting down association:%p\n", __func__, asoc);
1755 		sctp_primitive_SHUTDOWN(net, asoc, NULL);
1756 
1757 		return 0;
1758 	}
1759 
1760 	if (sflags & SCTP_ABORT) {
1761 		struct sctp_chunk *chunk;
1762 
1763 		chunk = sctp_make_abort_user(asoc, msg, msg_len);
1764 		if (!chunk)
1765 			return -ENOMEM;
1766 
1767 		pr_debug("%s: aborting association:%p\n", __func__, asoc);
1768 		sctp_primitive_ABORT(net, asoc, chunk);
1769 		iov_iter_revert(&msg->msg_iter, msg_len);
1770 
1771 		return 0;
1772 	}
1773 
1774 	return 1;
1775 }
1776 
1777 static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
1778 				struct msghdr *msg, size_t msg_len,
1779 				struct sctp_transport *transport,
1780 				struct sctp_sndrcvinfo *sinfo)
1781 {
1782 	struct sock *sk = asoc->base.sk;
1783 	struct sctp_sock *sp = sctp_sk(sk);
1784 	struct net *net = sock_net(sk);
1785 	struct sctp_datamsg *datamsg;
1786 	bool wait_connect = false;
1787 	struct sctp_chunk *chunk;
1788 	long timeo;
1789 	int err;
1790 
1791 	if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
1792 		err = -EINVAL;
1793 		goto err;
1794 	}
1795 
1796 	if (unlikely(!SCTP_SO(&asoc->stream, sinfo->sinfo_stream)->ext)) {
1797 		err = sctp_stream_init_ext(&asoc->stream, sinfo->sinfo_stream);
1798 		if (err)
1799 			goto err;
1800 	}
1801 
1802 	if (sp->disable_fragments && msg_len > asoc->frag_point) {
1803 		err = -EMSGSIZE;
1804 		goto err;
1805 	}
1806 
1807 	if (asoc->pmtu_pending) {
1808 		if (sp->param_flags & SPP_PMTUD_ENABLE)
1809 			sctp_assoc_sync_pmtu(asoc);
1810 		asoc->pmtu_pending = 0;
1811 	}
1812 
1813 	if (sctp_wspace(asoc) < (int)msg_len)
1814 		sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
1815 
1816 	if (sk_under_memory_pressure(sk))
1817 		sk_mem_reclaim(sk);
1818 
1819 	if (sctp_wspace(asoc) <= 0 || !sk_wmem_schedule(sk, msg_len)) {
1820 		timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1821 		err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1822 		if (err)
1823 			goto err;
1824 	}
1825 
1826 	if (sctp_state(asoc, CLOSED)) {
1827 		err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1828 		if (err)
1829 			goto err;
1830 
1831 		if (asoc->ep->intl_enable) {
1832 			timeo = sock_sndtimeo(sk, 0);
1833 			err = sctp_wait_for_connect(asoc, &timeo);
1834 			if (err) {
1835 				err = -ESRCH;
1836 				goto err;
1837 			}
1838 		} else {
1839 			wait_connect = true;
1840 		}
1841 
1842 		pr_debug("%s: we associated primitively\n", __func__);
1843 	}
1844 
1845 	datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1846 	if (IS_ERR(datamsg)) {
1847 		err = PTR_ERR(datamsg);
1848 		goto err;
1849 	}
1850 
1851 	asoc->force_delay = !!(msg->msg_flags & MSG_MORE);
1852 
1853 	list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1854 		sctp_chunk_hold(chunk);
1855 		sctp_set_owner_w(chunk);
1856 		chunk->transport = transport;
1857 	}
1858 
1859 	err = sctp_primitive_SEND(net, asoc, datamsg);
1860 	if (err) {
1861 		sctp_datamsg_free(datamsg);
1862 		goto err;
1863 	}
1864 
1865 	pr_debug("%s: we sent primitively\n", __func__);
1866 
1867 	sctp_datamsg_put(datamsg);
1868 
1869 	if (unlikely(wait_connect)) {
1870 		timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1871 		sctp_wait_for_connect(asoc, &timeo);
1872 	}
1873 
1874 	err = msg_len;
1875 
1876 err:
1877 	return err;
1878 }
1879 
1880 static union sctp_addr *sctp_sendmsg_get_daddr(struct sock *sk,
1881 					       const struct msghdr *msg,
1882 					       struct sctp_cmsgs *cmsgs)
1883 {
1884 	union sctp_addr *daddr = NULL;
1885 	int err;
1886 
1887 	if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1888 		int len = msg->msg_namelen;
1889 
1890 		if (len > sizeof(*daddr))
1891 			len = sizeof(*daddr);
1892 
1893 		daddr = (union sctp_addr *)msg->msg_name;
1894 
1895 		err = sctp_verify_addr(sk, daddr, len);
1896 		if (err)
1897 			return ERR_PTR(err);
1898 	}
1899 
1900 	return daddr;
1901 }
1902 
1903 static void sctp_sendmsg_update_sinfo(struct sctp_association *asoc,
1904 				      struct sctp_sndrcvinfo *sinfo,
1905 				      struct sctp_cmsgs *cmsgs)
1906 {
1907 	if (!cmsgs->srinfo && !cmsgs->sinfo) {
1908 		sinfo->sinfo_stream = asoc->default_stream;
1909 		sinfo->sinfo_ppid = asoc->default_ppid;
1910 		sinfo->sinfo_context = asoc->default_context;
1911 		sinfo->sinfo_assoc_id = sctp_assoc2id(asoc);
1912 
1913 		if (!cmsgs->prinfo)
1914 			sinfo->sinfo_flags = asoc->default_flags;
1915 	}
1916 
1917 	if (!cmsgs->srinfo && !cmsgs->prinfo)
1918 		sinfo->sinfo_timetolive = asoc->default_timetolive;
1919 
1920 	if (cmsgs->authinfo) {
1921 		/* Reuse sinfo_tsn to indicate that authinfo was set and
1922 		 * sinfo_ssn to save the keyid on tx path.
1923 		 */
1924 		sinfo->sinfo_tsn = 1;
1925 		sinfo->sinfo_ssn = cmsgs->authinfo->auth_keynumber;
1926 	}
1927 }
1928 
1929 static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
1930 {
1931 	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1932 	struct sctp_transport *transport = NULL;
1933 	struct sctp_sndrcvinfo _sinfo, *sinfo;
1934 	struct sctp_association *asoc, *tmp;
1935 	struct sctp_cmsgs cmsgs;
1936 	union sctp_addr *daddr;
1937 	bool new = false;
1938 	__u16 sflags;
1939 	int err;
1940 
1941 	/* Parse and get snd_info */
1942 	err = sctp_sendmsg_parse(sk, &cmsgs, &_sinfo, msg, msg_len);
1943 	if (err)
1944 		goto out;
1945 
1946 	sinfo  = &_sinfo;
1947 	sflags = sinfo->sinfo_flags;
1948 
1949 	/* Get daddr from msg */
1950 	daddr = sctp_sendmsg_get_daddr(sk, msg, &cmsgs);
1951 	if (IS_ERR(daddr)) {
1952 		err = PTR_ERR(daddr);
1953 		goto out;
1954 	}
1955 
1956 	lock_sock(sk);
1957 
1958 	/* SCTP_SENDALL process */
1959 	if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP)) {
1960 		list_for_each_entry_safe(asoc, tmp, &ep->asocs, asocs) {
1961 			err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
1962 							msg_len);
1963 			if (err == 0)
1964 				continue;
1965 			if (err < 0)
1966 				goto out_unlock;
1967 
1968 			sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
1969 
1970 			err = sctp_sendmsg_to_asoc(asoc, msg, msg_len,
1971 						   NULL, sinfo);
1972 			if (err < 0)
1973 				goto out_unlock;
1974 
1975 			iov_iter_revert(&msg->msg_iter, err);
1976 		}
1977 
1978 		goto out_unlock;
1979 	}
1980 
1981 	/* Get and check or create asoc */
1982 	if (daddr) {
1983 		asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1984 		if (asoc) {
1985 			err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
1986 							msg_len);
1987 			if (err <= 0)
1988 				goto out_unlock;
1989 		} else {
1990 			err = sctp_sendmsg_new_asoc(sk, sflags, &cmsgs, daddr,
1991 						    &transport);
1992 			if (err)
1993 				goto out_unlock;
1994 
1995 			asoc = transport->asoc;
1996 			new = true;
1997 		}
1998 
1999 		if (!sctp_style(sk, TCP) && !(sflags & SCTP_ADDR_OVER))
2000 			transport = NULL;
2001 	} else {
2002 		asoc = sctp_id2assoc(sk, sinfo->sinfo_assoc_id);
2003 		if (!asoc) {
2004 			err = -EPIPE;
2005 			goto out_unlock;
2006 		}
2007 
2008 		err = sctp_sendmsg_check_sflags(asoc, sflags, msg, msg_len);
2009 		if (err <= 0)
2010 			goto out_unlock;
2011 	}
2012 
2013 	/* Update snd_info with the asoc */
2014 	sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
2015 
2016 	/* Send msg to the asoc */
2017 	err = sctp_sendmsg_to_asoc(asoc, msg, msg_len, transport, sinfo);
2018 	if (err < 0 && err != -ESRCH && new)
2019 		sctp_association_free(asoc);
2020 
2021 out_unlock:
2022 	release_sock(sk);
2023 out:
2024 	return sctp_error(sk, msg->msg_flags, err);
2025 }
2026 
2027 /* This is an extended version of skb_pull() that removes the data from the
2028  * start of a skb even when data is spread across the list of skb's in the
2029  * frag_list. len specifies the total amount of data that needs to be removed.
2030  * when 'len' bytes could be removed from the skb, it returns 0.
2031  * If 'len' exceeds the total skb length,  it returns the no. of bytes that
2032  * could not be removed.
2033  */
2034 static int sctp_skb_pull(struct sk_buff *skb, int len)
2035 {
2036 	struct sk_buff *list;
2037 	int skb_len = skb_headlen(skb);
2038 	int rlen;
2039 
2040 	if (len <= skb_len) {
2041 		__skb_pull(skb, len);
2042 		return 0;
2043 	}
2044 	len -= skb_len;
2045 	__skb_pull(skb, skb_len);
2046 
2047 	skb_walk_frags(skb, list) {
2048 		rlen = sctp_skb_pull(list, len);
2049 		skb->len -= (len-rlen);
2050 		skb->data_len -= (len-rlen);
2051 
2052 		if (!rlen)
2053 			return 0;
2054 
2055 		len = rlen;
2056 	}
2057 
2058 	return len;
2059 }
2060 
2061 /* API 3.1.3  recvmsg() - UDP Style Syntax
2062  *
2063  *  ssize_t recvmsg(int socket, struct msghdr *message,
2064  *                    int flags);
2065  *
2066  *  socket  - the socket descriptor of the endpoint.
2067  *  message - pointer to the msghdr structure which contains a single
2068  *            user message and possibly some ancillary data.
2069  *
2070  *            See Section 5 for complete description of the data
2071  *            structures.
2072  *
2073  *  flags   - flags sent or received with the user message, see Section
2074  *            5 for complete description of the flags.
2075  */
2076 static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2077 			int noblock, int flags, int *addr_len)
2078 {
2079 	struct sctp_ulpevent *event = NULL;
2080 	struct sctp_sock *sp = sctp_sk(sk);
2081 	struct sk_buff *skb, *head_skb;
2082 	int copied;
2083 	int err = 0;
2084 	int skb_len;
2085 
2086 	pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2087 		 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2088 		 addr_len);
2089 
2090 	lock_sock(sk);
2091 
2092 	if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2093 	    !sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
2094 		err = -ENOTCONN;
2095 		goto out;
2096 	}
2097 
2098 	skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2099 	if (!skb)
2100 		goto out;
2101 
2102 	/* Get the total length of the skb including any skb's in the
2103 	 * frag_list.
2104 	 */
2105 	skb_len = skb->len;
2106 
2107 	copied = skb_len;
2108 	if (copied > len)
2109 		copied = len;
2110 
2111 	err = skb_copy_datagram_msg(skb, 0, msg, copied);
2112 
2113 	event = sctp_skb2event(skb);
2114 
2115 	if (err)
2116 		goto out_free;
2117 
2118 	if (event->chunk && event->chunk->head_skb)
2119 		head_skb = event->chunk->head_skb;
2120 	else
2121 		head_skb = skb;
2122 	sock_recv_ts_and_drops(msg, sk, head_skb);
2123 	if (sctp_ulpevent_is_notification(event)) {
2124 		msg->msg_flags |= MSG_NOTIFICATION;
2125 		sp->pf->event_msgname(event, msg->msg_name, addr_len);
2126 	} else {
2127 		sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
2128 	}
2129 
2130 	/* Check if we allow SCTP_NXTINFO. */
2131 	if (sp->recvnxtinfo)
2132 		sctp_ulpevent_read_nxtinfo(event, msg, sk);
2133 	/* Check if we allow SCTP_RCVINFO. */
2134 	if (sp->recvrcvinfo)
2135 		sctp_ulpevent_read_rcvinfo(event, msg);
2136 	/* Check if we allow SCTP_SNDRCVINFO. */
2137 	if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_DATA_IO_EVENT))
2138 		sctp_ulpevent_read_sndrcvinfo(event, msg);
2139 
2140 	err = copied;
2141 
2142 	/* If skb's length exceeds the user's buffer, update the skb and
2143 	 * push it back to the receive_queue so that the next call to
2144 	 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2145 	 */
2146 	if (skb_len > copied) {
2147 		msg->msg_flags &= ~MSG_EOR;
2148 		if (flags & MSG_PEEK)
2149 			goto out_free;
2150 		sctp_skb_pull(skb, copied);
2151 		skb_queue_head(&sk->sk_receive_queue, skb);
2152 
2153 		/* When only partial message is copied to the user, increase
2154 		 * rwnd by that amount. If all the data in the skb is read,
2155 		 * rwnd is updated when the event is freed.
2156 		 */
2157 		if (!sctp_ulpevent_is_notification(event))
2158 			sctp_assoc_rwnd_increase(event->asoc, copied);
2159 		goto out;
2160 	} else if ((event->msg_flags & MSG_NOTIFICATION) ||
2161 		   (event->msg_flags & MSG_EOR))
2162 		msg->msg_flags |= MSG_EOR;
2163 	else
2164 		msg->msg_flags &= ~MSG_EOR;
2165 
2166 out_free:
2167 	if (flags & MSG_PEEK) {
2168 		/* Release the skb reference acquired after peeking the skb in
2169 		 * sctp_skb_recv_datagram().
2170 		 */
2171 		kfree_skb(skb);
2172 	} else {
2173 		/* Free the event which includes releasing the reference to
2174 		 * the owner of the skb, freeing the skb and updating the
2175 		 * rwnd.
2176 		 */
2177 		sctp_ulpevent_free(event);
2178 	}
2179 out:
2180 	release_sock(sk);
2181 	return err;
2182 }
2183 
2184 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2185  *
2186  * This option is a on/off flag.  If enabled no SCTP message
2187  * fragmentation will be performed.  Instead if a message being sent
2188  * exceeds the current PMTU size, the message will NOT be sent and
2189  * instead a error will be indicated to the user.
2190  */
2191 static int sctp_setsockopt_disable_fragments(struct sock *sk,
2192 					     char __user *optval,
2193 					     unsigned int optlen)
2194 {
2195 	int val;
2196 
2197 	if (optlen < sizeof(int))
2198 		return -EINVAL;
2199 
2200 	if (get_user(val, (int __user *)optval))
2201 		return -EFAULT;
2202 
2203 	sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2204 
2205 	return 0;
2206 }
2207 
2208 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2209 				  unsigned int optlen)
2210 {
2211 	struct sctp_event_subscribe subscribe;
2212 	__u8 *sn_type = (__u8 *)&subscribe;
2213 	struct sctp_sock *sp = sctp_sk(sk);
2214 	struct sctp_association *asoc;
2215 	int i;
2216 
2217 	if (optlen > sizeof(struct sctp_event_subscribe))
2218 		return -EINVAL;
2219 
2220 	if (copy_from_user(&subscribe, optval, optlen))
2221 		return -EFAULT;
2222 
2223 	for (i = 0; i < optlen; i++)
2224 		sctp_ulpevent_type_set(&sp->subscribe, SCTP_SN_TYPE_BASE + i,
2225 				       sn_type[i]);
2226 
2227 	list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2228 		asoc->subscribe = sctp_sk(sk)->subscribe;
2229 
2230 	/* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2231 	 * if there is no data to be sent or retransmit, the stack will
2232 	 * immediately send up this notification.
2233 	 */
2234 	if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_SENDER_DRY_EVENT)) {
2235 		struct sctp_ulpevent *event;
2236 
2237 		asoc = sctp_id2assoc(sk, 0);
2238 		if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2239 			event = sctp_ulpevent_make_sender_dry_event(asoc,
2240 					GFP_USER | __GFP_NOWARN);
2241 			if (!event)
2242 				return -ENOMEM;
2243 
2244 			asoc->stream.si->enqueue_event(&asoc->ulpq, event);
2245 		}
2246 	}
2247 
2248 	return 0;
2249 }
2250 
2251 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2252  *
2253  * This socket option is applicable to the UDP-style socket only.  When
2254  * set it will cause associations that are idle for more than the
2255  * specified number of seconds to automatically close.  An association
2256  * being idle is defined an association that has NOT sent or received
2257  * user data.  The special value of '0' indicates that no automatic
2258  * close of any associations should be performed.  The option expects an
2259  * integer defining the number of seconds of idle time before an
2260  * association is closed.
2261  */
2262 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2263 				     unsigned int optlen)
2264 {
2265 	struct sctp_sock *sp = sctp_sk(sk);
2266 	struct net *net = sock_net(sk);
2267 
2268 	/* Applicable to UDP-style socket only */
2269 	if (sctp_style(sk, TCP))
2270 		return -EOPNOTSUPP;
2271 	if (optlen != sizeof(int))
2272 		return -EINVAL;
2273 	if (copy_from_user(&sp->autoclose, optval, optlen))
2274 		return -EFAULT;
2275 
2276 	if (sp->autoclose > net->sctp.max_autoclose)
2277 		sp->autoclose = net->sctp.max_autoclose;
2278 
2279 	return 0;
2280 }
2281 
2282 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2283  *
2284  * Applications can enable or disable heartbeats for any peer address of
2285  * an association, modify an address's heartbeat interval, force a
2286  * heartbeat to be sent immediately, and adjust the address's maximum
2287  * number of retransmissions sent before an address is considered
2288  * unreachable.  The following structure is used to access and modify an
2289  * address's parameters:
2290  *
2291  *  struct sctp_paddrparams {
2292  *     sctp_assoc_t            spp_assoc_id;
2293  *     struct sockaddr_storage spp_address;
2294  *     uint32_t                spp_hbinterval;
2295  *     uint16_t                spp_pathmaxrxt;
2296  *     uint32_t                spp_pathmtu;
2297  *     uint32_t                spp_sackdelay;
2298  *     uint32_t                spp_flags;
2299  *     uint32_t                spp_ipv6_flowlabel;
2300  *     uint8_t                 spp_dscp;
2301  * };
2302  *
2303  *   spp_assoc_id    - (one-to-many style socket) This is filled in the
2304  *                     application, and identifies the association for
2305  *                     this query.
2306  *   spp_address     - This specifies which address is of interest.
2307  *   spp_hbinterval  - This contains the value of the heartbeat interval,
2308  *                     in milliseconds.  If a  value of zero
2309  *                     is present in this field then no changes are to
2310  *                     be made to this parameter.
2311  *   spp_pathmaxrxt  - This contains the maximum number of
2312  *                     retransmissions before this address shall be
2313  *                     considered unreachable. If a  value of zero
2314  *                     is present in this field then no changes are to
2315  *                     be made to this parameter.
2316  *   spp_pathmtu     - When Path MTU discovery is disabled the value
2317  *                     specified here will be the "fixed" path mtu.
2318  *                     Note that if the spp_address field is empty
2319  *                     then all associations on this address will
2320  *                     have this fixed path mtu set upon them.
2321  *
2322  *   spp_sackdelay   - When delayed sack is enabled, this value specifies
2323  *                     the number of milliseconds that sacks will be delayed
2324  *                     for. This value will apply to all addresses of an
2325  *                     association if the spp_address field is empty. Note
2326  *                     also, that if delayed sack is enabled and this
2327  *                     value is set to 0, no change is made to the last
2328  *                     recorded delayed sack timer value.
2329  *
2330  *   spp_flags       - These flags are used to control various features
2331  *                     on an association. The flag field may contain
2332  *                     zero or more of the following options.
2333  *
2334  *                     SPP_HB_ENABLE  - Enable heartbeats on the
2335  *                     specified address. Note that if the address
2336  *                     field is empty all addresses for the association
2337  *                     have heartbeats enabled upon them.
2338  *
2339  *                     SPP_HB_DISABLE - Disable heartbeats on the
2340  *                     speicifed address. Note that if the address
2341  *                     field is empty all addresses for the association
2342  *                     will have their heartbeats disabled. Note also
2343  *                     that SPP_HB_ENABLE and SPP_HB_DISABLE are
2344  *                     mutually exclusive, only one of these two should
2345  *                     be specified. Enabling both fields will have
2346  *                     undetermined results.
2347  *
2348  *                     SPP_HB_DEMAND - Request a user initiated heartbeat
2349  *                     to be made immediately.
2350  *
2351  *                     SPP_HB_TIME_IS_ZERO - Specify's that the time for
2352  *                     heartbeat delayis to be set to the value of 0
2353  *                     milliseconds.
2354  *
2355  *                     SPP_PMTUD_ENABLE - This field will enable PMTU
2356  *                     discovery upon the specified address. Note that
2357  *                     if the address feild is empty then all addresses
2358  *                     on the association are effected.
2359  *
2360  *                     SPP_PMTUD_DISABLE - This field will disable PMTU
2361  *                     discovery upon the specified address. Note that
2362  *                     if the address feild is empty then all addresses
2363  *                     on the association are effected. Not also that
2364  *                     SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2365  *                     exclusive. Enabling both will have undetermined
2366  *                     results.
2367  *
2368  *                     SPP_SACKDELAY_ENABLE - Setting this flag turns
2369  *                     on delayed sack. The time specified in spp_sackdelay
2370  *                     is used to specify the sack delay for this address. Note
2371  *                     that if spp_address is empty then all addresses will
2372  *                     enable delayed sack and take on the sack delay
2373  *                     value specified in spp_sackdelay.
2374  *                     SPP_SACKDELAY_DISABLE - Setting this flag turns
2375  *                     off delayed sack. If the spp_address field is blank then
2376  *                     delayed sack is disabled for the entire association. Note
2377  *                     also that this field is mutually exclusive to
2378  *                     SPP_SACKDELAY_ENABLE, setting both will have undefined
2379  *                     results.
2380  *
2381  *                     SPP_IPV6_FLOWLABEL:  Setting this flag enables the
2382  *                     setting of the IPV6 flow label value.  The value is
2383  *                     contained in the spp_ipv6_flowlabel field.
2384  *                     Upon retrieval, this flag will be set to indicate that
2385  *                     the spp_ipv6_flowlabel field has a valid value returned.
2386  *                     If a specific destination address is set (in the
2387  *                     spp_address field), then the value returned is that of
2388  *                     the address.  If just an association is specified (and
2389  *                     no address), then the association's default flow label
2390  *                     is returned.  If neither an association nor a destination
2391  *                     is specified, then the socket's default flow label is
2392  *                     returned.  For non-IPv6 sockets, this flag will be left
2393  *                     cleared.
2394  *
2395  *                     SPP_DSCP:  Setting this flag enables the setting of the
2396  *                     Differentiated Services Code Point (DSCP) value
2397  *                     associated with either the association or a specific
2398  *                     address.  The value is obtained in the spp_dscp field.
2399  *                     Upon retrieval, this flag will be set to indicate that
2400  *                     the spp_dscp field has a valid value returned.  If a
2401  *                     specific destination address is set when called (in the
2402  *                     spp_address field), then that specific destination
2403  *                     address's DSCP value is returned.  If just an association
2404  *                     is specified, then the association's default DSCP is
2405  *                     returned.  If neither an association nor a destination is
2406  *                     specified, then the socket's default DSCP is returned.
2407  *
2408  *   spp_ipv6_flowlabel
2409  *                   - This field is used in conjunction with the
2410  *                     SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
2411  *                     The 20 least significant bits are used for the flow
2412  *                     label.  This setting has precedence over any IPv6-layer
2413  *                     setting.
2414  *
2415  *   spp_dscp        - This field is used in conjunction with the SPP_DSCP flag
2416  *                     and contains the DSCP.  The 6 most significant bits are
2417  *                     used for the DSCP.  This setting has precedence over any
2418  *                     IPv4- or IPv6- layer setting.
2419  */
2420 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2421 				       struct sctp_transport   *trans,
2422 				       struct sctp_association *asoc,
2423 				       struct sctp_sock        *sp,
2424 				       int                      hb_change,
2425 				       int                      pmtud_change,
2426 				       int                      sackdelay_change)
2427 {
2428 	int error;
2429 
2430 	if (params->spp_flags & SPP_HB_DEMAND && trans) {
2431 		struct net *net = sock_net(trans->asoc->base.sk);
2432 
2433 		error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2434 		if (error)
2435 			return error;
2436 	}
2437 
2438 	/* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2439 	 * this field is ignored.  Note also that a value of zero indicates
2440 	 * the current setting should be left unchanged.
2441 	 */
2442 	if (params->spp_flags & SPP_HB_ENABLE) {
2443 
2444 		/* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2445 		 * set.  This lets us use 0 value when this flag
2446 		 * is set.
2447 		 */
2448 		if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2449 			params->spp_hbinterval = 0;
2450 
2451 		if (params->spp_hbinterval ||
2452 		    (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2453 			if (trans) {
2454 				trans->hbinterval =
2455 				    msecs_to_jiffies(params->spp_hbinterval);
2456 			} else if (asoc) {
2457 				asoc->hbinterval =
2458 				    msecs_to_jiffies(params->spp_hbinterval);
2459 			} else {
2460 				sp->hbinterval = params->spp_hbinterval;
2461 			}
2462 		}
2463 	}
2464 
2465 	if (hb_change) {
2466 		if (trans) {
2467 			trans->param_flags =
2468 				(trans->param_flags & ~SPP_HB) | hb_change;
2469 		} else if (asoc) {
2470 			asoc->param_flags =
2471 				(asoc->param_flags & ~SPP_HB) | hb_change;
2472 		} else {
2473 			sp->param_flags =
2474 				(sp->param_flags & ~SPP_HB) | hb_change;
2475 		}
2476 	}
2477 
2478 	/* When Path MTU discovery is disabled the value specified here will
2479 	 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2480 	 * include the flag SPP_PMTUD_DISABLE for this field to have any
2481 	 * effect).
2482 	 */
2483 	if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2484 		if (trans) {
2485 			trans->pathmtu = params->spp_pathmtu;
2486 			sctp_assoc_sync_pmtu(asoc);
2487 		} else if (asoc) {
2488 			sctp_assoc_set_pmtu(asoc, params->spp_pathmtu);
2489 		} else {
2490 			sp->pathmtu = params->spp_pathmtu;
2491 		}
2492 	}
2493 
2494 	if (pmtud_change) {
2495 		if (trans) {
2496 			int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2497 				(params->spp_flags & SPP_PMTUD_ENABLE);
2498 			trans->param_flags =
2499 				(trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2500 			if (update) {
2501 				sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2502 				sctp_assoc_sync_pmtu(asoc);
2503 			}
2504 		} else if (asoc) {
2505 			asoc->param_flags =
2506 				(asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2507 		} else {
2508 			sp->param_flags =
2509 				(sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2510 		}
2511 	}
2512 
2513 	/* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2514 	 * value of this field is ignored.  Note also that a value of zero
2515 	 * indicates the current setting should be left unchanged.
2516 	 */
2517 	if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2518 		if (trans) {
2519 			trans->sackdelay =
2520 				msecs_to_jiffies(params->spp_sackdelay);
2521 		} else if (asoc) {
2522 			asoc->sackdelay =
2523 				msecs_to_jiffies(params->spp_sackdelay);
2524 		} else {
2525 			sp->sackdelay = params->spp_sackdelay;
2526 		}
2527 	}
2528 
2529 	if (sackdelay_change) {
2530 		if (trans) {
2531 			trans->param_flags =
2532 				(trans->param_flags & ~SPP_SACKDELAY) |
2533 				sackdelay_change;
2534 		} else if (asoc) {
2535 			asoc->param_flags =
2536 				(asoc->param_flags & ~SPP_SACKDELAY) |
2537 				sackdelay_change;
2538 		} else {
2539 			sp->param_flags =
2540 				(sp->param_flags & ~SPP_SACKDELAY) |
2541 				sackdelay_change;
2542 		}
2543 	}
2544 
2545 	/* Note that a value of zero indicates the current setting should be
2546 	   left unchanged.
2547 	 */
2548 	if (params->spp_pathmaxrxt) {
2549 		if (trans) {
2550 			trans->pathmaxrxt = params->spp_pathmaxrxt;
2551 		} else if (asoc) {
2552 			asoc->pathmaxrxt = params->spp_pathmaxrxt;
2553 		} else {
2554 			sp->pathmaxrxt = params->spp_pathmaxrxt;
2555 		}
2556 	}
2557 
2558 	if (params->spp_flags & SPP_IPV6_FLOWLABEL) {
2559 		if (trans) {
2560 			if (trans->ipaddr.sa.sa_family == AF_INET6) {
2561 				trans->flowlabel = params->spp_ipv6_flowlabel &
2562 						   SCTP_FLOWLABEL_VAL_MASK;
2563 				trans->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2564 			}
2565 		} else if (asoc) {
2566 			struct sctp_transport *t;
2567 
2568 			list_for_each_entry(t, &asoc->peer.transport_addr_list,
2569 					    transports) {
2570 				if (t->ipaddr.sa.sa_family != AF_INET6)
2571 					continue;
2572 				t->flowlabel = params->spp_ipv6_flowlabel &
2573 					       SCTP_FLOWLABEL_VAL_MASK;
2574 				t->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2575 			}
2576 			asoc->flowlabel = params->spp_ipv6_flowlabel &
2577 					  SCTP_FLOWLABEL_VAL_MASK;
2578 			asoc->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2579 		} else if (sctp_opt2sk(sp)->sk_family == AF_INET6) {
2580 			sp->flowlabel = params->spp_ipv6_flowlabel &
2581 					SCTP_FLOWLABEL_VAL_MASK;
2582 			sp->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2583 		}
2584 	}
2585 
2586 	if (params->spp_flags & SPP_DSCP) {
2587 		if (trans) {
2588 			trans->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2589 			trans->dscp |= SCTP_DSCP_SET_MASK;
2590 		} else if (asoc) {
2591 			struct sctp_transport *t;
2592 
2593 			list_for_each_entry(t, &asoc->peer.transport_addr_list,
2594 					    transports) {
2595 				t->dscp = params->spp_dscp &
2596 					  SCTP_DSCP_VAL_MASK;
2597 				t->dscp |= SCTP_DSCP_SET_MASK;
2598 			}
2599 			asoc->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2600 			asoc->dscp |= SCTP_DSCP_SET_MASK;
2601 		} else {
2602 			sp->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2603 			sp->dscp |= SCTP_DSCP_SET_MASK;
2604 		}
2605 	}
2606 
2607 	return 0;
2608 }
2609 
2610 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2611 					    char __user *optval,
2612 					    unsigned int optlen)
2613 {
2614 	struct sctp_paddrparams  params;
2615 	struct sctp_transport   *trans = NULL;
2616 	struct sctp_association *asoc = NULL;
2617 	struct sctp_sock        *sp = sctp_sk(sk);
2618 	int error;
2619 	int hb_change, pmtud_change, sackdelay_change;
2620 
2621 	if (optlen == sizeof(params)) {
2622 		if (copy_from_user(&params, optval, optlen))
2623 			return -EFAULT;
2624 	} else if (optlen == ALIGN(offsetof(struct sctp_paddrparams,
2625 					    spp_ipv6_flowlabel), 4)) {
2626 		if (copy_from_user(&params, optval, optlen))
2627 			return -EFAULT;
2628 		if (params.spp_flags & (SPP_DSCP | SPP_IPV6_FLOWLABEL))
2629 			return -EINVAL;
2630 	} else {
2631 		return -EINVAL;
2632 	}
2633 
2634 	/* Validate flags and value parameters. */
2635 	hb_change        = params.spp_flags & SPP_HB;
2636 	pmtud_change     = params.spp_flags & SPP_PMTUD;
2637 	sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2638 
2639 	if (hb_change        == SPP_HB ||
2640 	    pmtud_change     == SPP_PMTUD ||
2641 	    sackdelay_change == SPP_SACKDELAY ||
2642 	    params.spp_sackdelay > 500 ||
2643 	    (params.spp_pathmtu &&
2644 	     params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2645 		return -EINVAL;
2646 
2647 	/* If an address other than INADDR_ANY is specified, and
2648 	 * no transport is found, then the request is invalid.
2649 	 */
2650 	if (!sctp_is_any(sk, (union sctp_addr *)&params.spp_address)) {
2651 		trans = sctp_addr_id2transport(sk, &params.spp_address,
2652 					       params.spp_assoc_id);
2653 		if (!trans)
2654 			return -EINVAL;
2655 	}
2656 
2657 	/* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
2658 	 * socket is a one to many style socket, and an association
2659 	 * was not found, then the id was invalid.
2660 	 */
2661 	asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2662 	if (!asoc && params.spp_assoc_id != SCTP_FUTURE_ASSOC &&
2663 	    sctp_style(sk, UDP))
2664 		return -EINVAL;
2665 
2666 	/* Heartbeat demand can only be sent on a transport or
2667 	 * association, but not a socket.
2668 	 */
2669 	if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2670 		return -EINVAL;
2671 
2672 	/* Process parameters. */
2673 	error = sctp_apply_peer_addr_params(&params, trans, asoc, sp,
2674 					    hb_change, pmtud_change,
2675 					    sackdelay_change);
2676 
2677 	if (error)
2678 		return error;
2679 
2680 	/* If changes are for association, also apply parameters to each
2681 	 * transport.
2682 	 */
2683 	if (!trans && asoc) {
2684 		list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2685 				transports) {
2686 			sctp_apply_peer_addr_params(&params, trans, asoc, sp,
2687 						    hb_change, pmtud_change,
2688 						    sackdelay_change);
2689 		}
2690 	}
2691 
2692 	return 0;
2693 }
2694 
2695 static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2696 {
2697 	return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2698 }
2699 
2700 static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2701 {
2702 	return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2703 }
2704 
2705 static void sctp_apply_asoc_delayed_ack(struct sctp_sack_info *params,
2706 					struct sctp_association *asoc)
2707 {
2708 	struct sctp_transport *trans;
2709 
2710 	if (params->sack_delay) {
2711 		asoc->sackdelay = msecs_to_jiffies(params->sack_delay);
2712 		asoc->param_flags =
2713 			sctp_spp_sackdelay_enable(asoc->param_flags);
2714 	}
2715 	if (params->sack_freq == 1) {
2716 		asoc->param_flags =
2717 			sctp_spp_sackdelay_disable(asoc->param_flags);
2718 	} else if (params->sack_freq > 1) {
2719 		asoc->sackfreq = params->sack_freq;
2720 		asoc->param_flags =
2721 			sctp_spp_sackdelay_enable(asoc->param_flags);
2722 	}
2723 
2724 	list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2725 			    transports) {
2726 		if (params->sack_delay) {
2727 			trans->sackdelay = msecs_to_jiffies(params->sack_delay);
2728 			trans->param_flags =
2729 				sctp_spp_sackdelay_enable(trans->param_flags);
2730 		}
2731 		if (params->sack_freq == 1) {
2732 			trans->param_flags =
2733 				sctp_spp_sackdelay_disable(trans->param_flags);
2734 		} else if (params->sack_freq > 1) {
2735 			trans->sackfreq = params->sack_freq;
2736 			trans->param_flags =
2737 				sctp_spp_sackdelay_enable(trans->param_flags);
2738 		}
2739 	}
2740 }
2741 
2742 /*
2743  * 7.1.23.  Get or set delayed ack timer (SCTP_DELAYED_SACK)
2744  *
2745  * This option will effect the way delayed acks are performed.  This
2746  * option allows you to get or set the delayed ack time, in
2747  * milliseconds.  It also allows changing the delayed ack frequency.
2748  * Changing the frequency to 1 disables the delayed sack algorithm.  If
2749  * the assoc_id is 0, then this sets or gets the endpoints default
2750  * values.  If the assoc_id field is non-zero, then the set or get
2751  * effects the specified association for the one to many model (the
2752  * assoc_id field is ignored by the one to one model).  Note that if
2753  * sack_delay or sack_freq are 0 when setting this option, then the
2754  * current values will remain unchanged.
2755  *
2756  * struct sctp_sack_info {
2757  *     sctp_assoc_t            sack_assoc_id;
2758  *     uint32_t                sack_delay;
2759  *     uint32_t                sack_freq;
2760  * };
2761  *
2762  * sack_assoc_id -  This parameter, indicates which association the user
2763  *    is performing an action upon.  Note that if this field's value is
2764  *    zero then the endpoints default value is changed (effecting future
2765  *    associations only).
2766  *
2767  * sack_delay -  This parameter contains the number of milliseconds that
2768  *    the user is requesting the delayed ACK timer be set to.  Note that
2769  *    this value is defined in the standard to be between 200 and 500
2770  *    milliseconds.
2771  *
2772  * sack_freq -  This parameter contains the number of packets that must
2773  *    be received before a sack is sent without waiting for the delay
2774  *    timer to expire.  The default value for this is 2, setting this
2775  *    value to 1 will disable the delayed sack algorithm.
2776  */
2777 
2778 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2779 				       char __user *optval, unsigned int optlen)
2780 {
2781 	struct sctp_sock *sp = sctp_sk(sk);
2782 	struct sctp_association *asoc;
2783 	struct sctp_sack_info params;
2784 
2785 	if (optlen == sizeof(struct sctp_sack_info)) {
2786 		if (copy_from_user(&params, optval, optlen))
2787 			return -EFAULT;
2788 
2789 		if (params.sack_delay == 0 && params.sack_freq == 0)
2790 			return 0;
2791 	} else if (optlen == sizeof(struct sctp_assoc_value)) {
2792 		pr_warn_ratelimited(DEPRECATED
2793 				    "%s (pid %d) "
2794 				    "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2795 				    "Use struct sctp_sack_info instead\n",
2796 				    current->comm, task_pid_nr(current));
2797 		if (copy_from_user(&params, optval, optlen))
2798 			return -EFAULT;
2799 
2800 		if (params.sack_delay == 0)
2801 			params.sack_freq = 1;
2802 		else
2803 			params.sack_freq = 0;
2804 	} else
2805 		return -EINVAL;
2806 
2807 	/* Validate value parameter. */
2808 	if (params.sack_delay > 500)
2809 		return -EINVAL;
2810 
2811 	/* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
2812 	 * socket is a one to many style socket, and an association
2813 	 * was not found, then the id was invalid.
2814 	 */
2815 	asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2816 	if (!asoc && params.sack_assoc_id > SCTP_ALL_ASSOC &&
2817 	    sctp_style(sk, UDP))
2818 		return -EINVAL;
2819 
2820 	if (asoc) {
2821 		sctp_apply_asoc_delayed_ack(&params, asoc);
2822 
2823 		return 0;
2824 	}
2825 
2826 	if (sctp_style(sk, TCP))
2827 		params.sack_assoc_id = SCTP_FUTURE_ASSOC;
2828 
2829 	if (params.sack_assoc_id == SCTP_FUTURE_ASSOC ||
2830 	    params.sack_assoc_id == SCTP_ALL_ASSOC) {
2831 		if (params.sack_delay) {
2832 			sp->sackdelay = params.sack_delay;
2833 			sp->param_flags =
2834 				sctp_spp_sackdelay_enable(sp->param_flags);
2835 		}
2836 		if (params.sack_freq == 1) {
2837 			sp->param_flags =
2838 				sctp_spp_sackdelay_disable(sp->param_flags);
2839 		} else if (params.sack_freq > 1) {
2840 			sp->sackfreq = params.sack_freq;
2841 			sp->param_flags =
2842 				sctp_spp_sackdelay_enable(sp->param_flags);
2843 		}
2844 	}
2845 
2846 	if (params.sack_assoc_id == SCTP_CURRENT_ASSOC ||
2847 	    params.sack_assoc_id == SCTP_ALL_ASSOC)
2848 		list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2849 			sctp_apply_asoc_delayed_ack(&params, asoc);
2850 
2851 	return 0;
2852 }
2853 
2854 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2855  *
2856  * Applications can specify protocol parameters for the default association
2857  * initialization.  The option name argument to setsockopt() and getsockopt()
2858  * is SCTP_INITMSG.
2859  *
2860  * Setting initialization parameters is effective only on an unconnected
2861  * socket (for UDP-style sockets only future associations are effected
2862  * by the change).  With TCP-style sockets, this option is inherited by
2863  * sockets derived from a listener socket.
2864  */
2865 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2866 {
2867 	struct sctp_initmsg sinit;
2868 	struct sctp_sock *sp = sctp_sk(sk);
2869 
2870 	if (optlen != sizeof(struct sctp_initmsg))
2871 		return -EINVAL;
2872 	if (copy_from_user(&sinit, optval, optlen))
2873 		return -EFAULT;
2874 
2875 	if (sinit.sinit_num_ostreams)
2876 		sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2877 	if (sinit.sinit_max_instreams)
2878 		sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2879 	if (sinit.sinit_max_attempts)
2880 		sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2881 	if (sinit.sinit_max_init_timeo)
2882 		sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2883 
2884 	return 0;
2885 }
2886 
2887 /*
2888  * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2889  *
2890  *   Applications that wish to use the sendto() system call may wish to
2891  *   specify a default set of parameters that would normally be supplied
2892  *   through the inclusion of ancillary data.  This socket option allows
2893  *   such an application to set the default sctp_sndrcvinfo structure.
2894  *   The application that wishes to use this socket option simply passes
2895  *   in to this call the sctp_sndrcvinfo structure defined in Section
2896  *   5.2.2) The input parameters accepted by this call include
2897  *   sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2898  *   sinfo_timetolive.  The user must provide the sinfo_assoc_id field in
2899  *   to this call if the caller is using the UDP model.
2900  */
2901 static int sctp_setsockopt_default_send_param(struct sock *sk,
2902 					      char __user *optval,
2903 					      unsigned int optlen)
2904 {
2905 	struct sctp_sock *sp = sctp_sk(sk);
2906 	struct sctp_association *asoc;
2907 	struct sctp_sndrcvinfo info;
2908 
2909 	if (optlen != sizeof(info))
2910 		return -EINVAL;
2911 	if (copy_from_user(&info, optval, optlen))
2912 		return -EFAULT;
2913 	if (info.sinfo_flags &
2914 	    ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2915 	      SCTP_ABORT | SCTP_EOF))
2916 		return -EINVAL;
2917 
2918 	asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2919 	if (!asoc && info.sinfo_assoc_id > SCTP_ALL_ASSOC &&
2920 	    sctp_style(sk, UDP))
2921 		return -EINVAL;
2922 
2923 	if (asoc) {
2924 		asoc->default_stream = info.sinfo_stream;
2925 		asoc->default_flags = info.sinfo_flags;
2926 		asoc->default_ppid = info.sinfo_ppid;
2927 		asoc->default_context = info.sinfo_context;
2928 		asoc->default_timetolive = info.sinfo_timetolive;
2929 
2930 		return 0;
2931 	}
2932 
2933 	if (sctp_style(sk, TCP))
2934 		info.sinfo_assoc_id = SCTP_FUTURE_ASSOC;
2935 
2936 	if (info.sinfo_assoc_id == SCTP_FUTURE_ASSOC ||
2937 	    info.sinfo_assoc_id == SCTP_ALL_ASSOC) {
2938 		sp->default_stream = info.sinfo_stream;
2939 		sp->default_flags = info.sinfo_flags;
2940 		sp->default_ppid = info.sinfo_ppid;
2941 		sp->default_context = info.sinfo_context;
2942 		sp->default_timetolive = info.sinfo_timetolive;
2943 	}
2944 
2945 	if (info.sinfo_assoc_id == SCTP_CURRENT_ASSOC ||
2946 	    info.sinfo_assoc_id == SCTP_ALL_ASSOC) {
2947 		list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
2948 			asoc->default_stream = info.sinfo_stream;
2949 			asoc->default_flags = info.sinfo_flags;
2950 			asoc->default_ppid = info.sinfo_ppid;
2951 			asoc->default_context = info.sinfo_context;
2952 			asoc->default_timetolive = info.sinfo_timetolive;
2953 		}
2954 	}
2955 
2956 	return 0;
2957 }
2958 
2959 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2960  * (SCTP_DEFAULT_SNDINFO)
2961  */
2962 static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2963 					   char __user *optval,
2964 					   unsigned int optlen)
2965 {
2966 	struct sctp_sock *sp = sctp_sk(sk);
2967 	struct sctp_association *asoc;
2968 	struct sctp_sndinfo info;
2969 
2970 	if (optlen != sizeof(info))
2971 		return -EINVAL;
2972 	if (copy_from_user(&info, optval, optlen))
2973 		return -EFAULT;
2974 	if (info.snd_flags &
2975 	    ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2976 	      SCTP_ABORT | SCTP_EOF))
2977 		return -EINVAL;
2978 
2979 	asoc = sctp_id2assoc(sk, info.snd_assoc_id);
2980 	if (!asoc && info.snd_assoc_id > SCTP_ALL_ASSOC &&
2981 	    sctp_style(sk, UDP))
2982 		return -EINVAL;
2983 
2984 	if (asoc) {
2985 		asoc->default_stream = info.snd_sid;
2986 		asoc->default_flags = info.snd_flags;
2987 		asoc->default_ppid = info.snd_ppid;
2988 		asoc->default_context = info.snd_context;
2989 
2990 		return 0;
2991 	}
2992 
2993 	if (sctp_style(sk, TCP))
2994 		info.snd_assoc_id = SCTP_FUTURE_ASSOC;
2995 
2996 	if (info.snd_assoc_id == SCTP_FUTURE_ASSOC ||
2997 	    info.snd_assoc_id == SCTP_ALL_ASSOC) {
2998 		sp->default_stream = info.snd_sid;
2999 		sp->default_flags = info.snd_flags;
3000 		sp->default_ppid = info.snd_ppid;
3001 		sp->default_context = info.snd_context;
3002 	}
3003 
3004 	if (info.snd_assoc_id == SCTP_CURRENT_ASSOC ||
3005 	    info.snd_assoc_id == SCTP_ALL_ASSOC) {
3006 		list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
3007 			asoc->default_stream = info.snd_sid;
3008 			asoc->default_flags = info.snd_flags;
3009 			asoc->default_ppid = info.snd_ppid;
3010 			asoc->default_context = info.snd_context;
3011 		}
3012 	}
3013 
3014 	return 0;
3015 }
3016 
3017 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
3018  *
3019  * Requests that the local SCTP stack use the enclosed peer address as
3020  * the association primary.  The enclosed address must be one of the
3021  * association peer's addresses.
3022  */
3023 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
3024 					unsigned int optlen)
3025 {
3026 	struct sctp_prim prim;
3027 	struct sctp_transport *trans;
3028 	struct sctp_af *af;
3029 	int err;
3030 
3031 	if (optlen != sizeof(struct sctp_prim))
3032 		return -EINVAL;
3033 
3034 	if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
3035 		return -EFAULT;
3036 
3037 	/* Allow security module to validate address but need address len. */
3038 	af = sctp_get_af_specific(prim.ssp_addr.ss_family);
3039 	if (!af)
3040 		return -EINVAL;
3041 
3042 	err = security_sctp_bind_connect(sk, SCTP_PRIMARY_ADDR,
3043 					 (struct sockaddr *)&prim.ssp_addr,
3044 					 af->sockaddr_len);
3045 	if (err)
3046 		return err;
3047 
3048 	trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
3049 	if (!trans)
3050 		return -EINVAL;
3051 
3052 	sctp_assoc_set_primary(trans->asoc, trans);
3053 
3054 	return 0;
3055 }
3056 
3057 /*
3058  * 7.1.5 SCTP_NODELAY
3059  *
3060  * Turn on/off any Nagle-like algorithm.  This means that packets are
3061  * generally sent as soon as possible and no unnecessary delays are
3062  * introduced, at the cost of more packets in the network.  Expects an
3063  *  integer boolean flag.
3064  */
3065 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
3066 				   unsigned int optlen)
3067 {
3068 	int val;
3069 
3070 	if (optlen < sizeof(int))
3071 		return -EINVAL;
3072 	if (get_user(val, (int __user *)optval))
3073 		return -EFAULT;
3074 
3075 	sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
3076 	return 0;
3077 }
3078 
3079 /*
3080  *
3081  * 7.1.1 SCTP_RTOINFO
3082  *
3083  * The protocol parameters used to initialize and bound retransmission
3084  * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
3085  * and modify these parameters.
3086  * All parameters are time values, in milliseconds.  A value of 0, when
3087  * modifying the parameters, indicates that the current value should not
3088  * be changed.
3089  *
3090  */
3091 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
3092 {
3093 	struct sctp_rtoinfo rtoinfo;
3094 	struct sctp_association *asoc;
3095 	unsigned long rto_min, rto_max;
3096 	struct sctp_sock *sp = sctp_sk(sk);
3097 
3098 	if (optlen != sizeof (struct sctp_rtoinfo))
3099 		return -EINVAL;
3100 
3101 	if (copy_from_user(&rtoinfo, optval, optlen))
3102 		return -EFAULT;
3103 
3104 	asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
3105 
3106 	/* Set the values to the specific association */
3107 	if (!asoc && rtoinfo.srto_assoc_id != SCTP_FUTURE_ASSOC &&
3108 	    sctp_style(sk, UDP))
3109 		return -EINVAL;
3110 
3111 	rto_max = rtoinfo.srto_max;
3112 	rto_min = rtoinfo.srto_min;
3113 
3114 	if (rto_max)
3115 		rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
3116 	else
3117 		rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
3118 
3119 	if (rto_min)
3120 		rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
3121 	else
3122 		rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
3123 
3124 	if (rto_min > rto_max)
3125 		return -EINVAL;
3126 
3127 	if (asoc) {
3128 		if (rtoinfo.srto_initial != 0)
3129 			asoc->rto_initial =
3130 				msecs_to_jiffies(rtoinfo.srto_initial);
3131 		asoc->rto_max = rto_max;
3132 		asoc->rto_min = rto_min;
3133 	} else {
3134 		/* If there is no association or the association-id = 0
3135 		 * set the values to the endpoint.
3136 		 */
3137 		if (rtoinfo.srto_initial != 0)
3138 			sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
3139 		sp->rtoinfo.srto_max = rto_max;
3140 		sp->rtoinfo.srto_min = rto_min;
3141 	}
3142 
3143 	return 0;
3144 }
3145 
3146 /*
3147  *
3148  * 7.1.2 SCTP_ASSOCINFO
3149  *
3150  * This option is used to tune the maximum retransmission attempts
3151  * of the association.
3152  * Returns an error if the new association retransmission value is
3153  * greater than the sum of the retransmission value  of the peer.
3154  * See [SCTP] for more information.
3155  *
3156  */
3157 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
3158 {
3159 
3160 	struct sctp_assocparams assocparams;
3161 	struct sctp_association *asoc;
3162 
3163 	if (optlen != sizeof(struct sctp_assocparams))
3164 		return -EINVAL;
3165 	if (copy_from_user(&assocparams, optval, optlen))
3166 		return -EFAULT;
3167 
3168 	asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
3169 
3170 	if (!asoc && assocparams.sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
3171 	    sctp_style(sk, UDP))
3172 		return -EINVAL;
3173 
3174 	/* Set the values to the specific association */
3175 	if (asoc) {
3176 		if (assocparams.sasoc_asocmaxrxt != 0) {
3177 			__u32 path_sum = 0;
3178 			int   paths = 0;
3179 			struct sctp_transport *peer_addr;
3180 
3181 			list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3182 					transports) {
3183 				path_sum += peer_addr->pathmaxrxt;
3184 				paths++;
3185 			}
3186 
3187 			/* Only validate asocmaxrxt if we have more than
3188 			 * one path/transport.  We do this because path
3189 			 * retransmissions are only counted when we have more
3190 			 * then one path.
3191 			 */
3192 			if (paths > 1 &&
3193 			    assocparams.sasoc_asocmaxrxt > path_sum)
3194 				return -EINVAL;
3195 
3196 			asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
3197 		}
3198 
3199 		if (assocparams.sasoc_cookie_life != 0)
3200 			asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
3201 	} else {
3202 		/* Set the values to the endpoint */
3203 		struct sctp_sock *sp = sctp_sk(sk);
3204 
3205 		if (assocparams.sasoc_asocmaxrxt != 0)
3206 			sp->assocparams.sasoc_asocmaxrxt =
3207 						assocparams.sasoc_asocmaxrxt;
3208 		if (assocparams.sasoc_cookie_life != 0)
3209 			sp->assocparams.sasoc_cookie_life =
3210 						assocparams.sasoc_cookie_life;
3211 	}
3212 	return 0;
3213 }
3214 
3215 /*
3216  * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3217  *
3218  * This socket option is a boolean flag which turns on or off mapped V4
3219  * addresses.  If this option is turned on and the socket is type
3220  * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3221  * If this option is turned off, then no mapping will be done of V4
3222  * addresses and a user will receive both PF_INET6 and PF_INET type
3223  * addresses on the socket.
3224  */
3225 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
3226 {
3227 	int val;
3228 	struct sctp_sock *sp = sctp_sk(sk);
3229 
3230 	if (optlen < sizeof(int))
3231 		return -EINVAL;
3232 	if (get_user(val, (int __user *)optval))
3233 		return -EFAULT;
3234 	if (val)
3235 		sp->v4mapped = 1;
3236 	else
3237 		sp->v4mapped = 0;
3238 
3239 	return 0;
3240 }
3241 
3242 /*
3243  * 8.1.16.  Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3244  * This option will get or set the maximum size to put in any outgoing
3245  * SCTP DATA chunk.  If a message is larger than this size it will be
3246  * fragmented by SCTP into the specified size.  Note that the underlying
3247  * SCTP implementation may fragment into smaller sized chunks when the
3248  * PMTU of the underlying association is smaller than the value set by
3249  * the user.  The default value for this option is '0' which indicates
3250  * the user is NOT limiting fragmentation and only the PMTU will effect
3251  * SCTP's choice of DATA chunk size.  Note also that values set larger
3252  * than the maximum size of an IP datagram will effectively let SCTP
3253  * control fragmentation (i.e. the same as setting this option to 0).
3254  *
3255  * The following structure is used to access and modify this parameter:
3256  *
3257  * struct sctp_assoc_value {
3258  *   sctp_assoc_t assoc_id;
3259  *   uint32_t assoc_value;
3260  * };
3261  *
3262  * assoc_id:  This parameter is ignored for one-to-one style sockets.
3263  *    For one-to-many style sockets this parameter indicates which
3264  *    association the user is performing an action upon.  Note that if
3265  *    this field's value is zero then the endpoints default value is
3266  *    changed (effecting future associations only).
3267  * assoc_value:  This parameter specifies the maximum size in bytes.
3268  */
3269 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
3270 {
3271 	struct sctp_sock *sp = sctp_sk(sk);
3272 	struct sctp_assoc_value params;
3273 	struct sctp_association *asoc;
3274 	int val;
3275 
3276 	if (optlen == sizeof(int)) {
3277 		pr_warn_ratelimited(DEPRECATED
3278 				    "%s (pid %d) "
3279 				    "Use of int in maxseg socket option.\n"
3280 				    "Use struct sctp_assoc_value instead\n",
3281 				    current->comm, task_pid_nr(current));
3282 		if (copy_from_user(&val, optval, optlen))
3283 			return -EFAULT;
3284 		params.assoc_id = SCTP_FUTURE_ASSOC;
3285 	} else if (optlen == sizeof(struct sctp_assoc_value)) {
3286 		if (copy_from_user(&params, optval, optlen))
3287 			return -EFAULT;
3288 		val = params.assoc_value;
3289 	} else {
3290 		return -EINVAL;
3291 	}
3292 
3293 	asoc = sctp_id2assoc(sk, params.assoc_id);
3294 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
3295 	    sctp_style(sk, UDP))
3296 		return -EINVAL;
3297 
3298 	if (val) {
3299 		int min_len, max_len;
3300 		__u16 datasize = asoc ? sctp_datachk_len(&asoc->stream) :
3301 				 sizeof(struct sctp_data_chunk);
3302 
3303 		min_len = sctp_min_frag_point(sp, datasize);
3304 		max_len = SCTP_MAX_CHUNK_LEN - datasize;
3305 
3306 		if (val < min_len || val > max_len)
3307 			return -EINVAL;
3308 	}
3309 
3310 	if (asoc) {
3311 		asoc->user_frag = val;
3312 		sctp_assoc_update_frag_point(asoc);
3313 	} else {
3314 		sp->user_frag = val;
3315 	}
3316 
3317 	return 0;
3318 }
3319 
3320 
3321 /*
3322  *  7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3323  *
3324  *   Requests that the peer mark the enclosed address as the association
3325  *   primary. The enclosed address must be one of the association's
3326  *   locally bound addresses. The following structure is used to make a
3327  *   set primary request:
3328  */
3329 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
3330 					     unsigned int optlen)
3331 {
3332 	struct sctp_sock	*sp;
3333 	struct sctp_association	*asoc = NULL;
3334 	struct sctp_setpeerprim	prim;
3335 	struct sctp_chunk	*chunk;
3336 	struct sctp_af		*af;
3337 	int 			err;
3338 
3339 	sp = sctp_sk(sk);
3340 
3341 	if (!sp->ep->asconf_enable)
3342 		return -EPERM;
3343 
3344 	if (optlen != sizeof(struct sctp_setpeerprim))
3345 		return -EINVAL;
3346 
3347 	if (copy_from_user(&prim, optval, optlen))
3348 		return -EFAULT;
3349 
3350 	asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
3351 	if (!asoc)
3352 		return -EINVAL;
3353 
3354 	if (!asoc->peer.asconf_capable)
3355 		return -EPERM;
3356 
3357 	if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3358 		return -EPERM;
3359 
3360 	if (!sctp_state(asoc, ESTABLISHED))
3361 		return -ENOTCONN;
3362 
3363 	af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3364 	if (!af)
3365 		return -EINVAL;
3366 
3367 	if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3368 		return -EADDRNOTAVAIL;
3369 
3370 	if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3371 		return -EADDRNOTAVAIL;
3372 
3373 	/* Allow security module to validate address. */
3374 	err = security_sctp_bind_connect(sk, SCTP_SET_PEER_PRIMARY_ADDR,
3375 					 (struct sockaddr *)&prim.sspp_addr,
3376 					 af->sockaddr_len);
3377 	if (err)
3378 		return err;
3379 
3380 	/* Create an ASCONF chunk with SET_PRIMARY parameter	*/
3381 	chunk = sctp_make_asconf_set_prim(asoc,
3382 					  (union sctp_addr *)&prim.sspp_addr);
3383 	if (!chunk)
3384 		return -ENOMEM;
3385 
3386 	err = sctp_send_asconf(asoc, chunk);
3387 
3388 	pr_debug("%s: we set peer primary addr primitively\n", __func__);
3389 
3390 	return err;
3391 }
3392 
3393 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3394 					    unsigned int optlen)
3395 {
3396 	struct sctp_setadaptation adaptation;
3397 
3398 	if (optlen != sizeof(struct sctp_setadaptation))
3399 		return -EINVAL;
3400 	if (copy_from_user(&adaptation, optval, optlen))
3401 		return -EFAULT;
3402 
3403 	sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
3404 
3405 	return 0;
3406 }
3407 
3408 /*
3409  * 7.1.29.  Set or Get the default context (SCTP_CONTEXT)
3410  *
3411  * The context field in the sctp_sndrcvinfo structure is normally only
3412  * used when a failed message is retrieved holding the value that was
3413  * sent down on the actual send call.  This option allows the setting of
3414  * a default context on an association basis that will be received on
3415  * reading messages from the peer.  This is especially helpful in the
3416  * one-2-many model for an application to keep some reference to an
3417  * internal state machine that is processing messages on the
3418  * association.  Note that the setting of this value only effects
3419  * received messages from the peer and does not effect the value that is
3420  * saved with outbound messages.
3421  */
3422 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3423 				   unsigned int optlen)
3424 {
3425 	struct sctp_sock *sp = sctp_sk(sk);
3426 	struct sctp_assoc_value params;
3427 	struct sctp_association *asoc;
3428 
3429 	if (optlen != sizeof(struct sctp_assoc_value))
3430 		return -EINVAL;
3431 	if (copy_from_user(&params, optval, optlen))
3432 		return -EFAULT;
3433 
3434 	asoc = sctp_id2assoc(sk, params.assoc_id);
3435 	if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
3436 	    sctp_style(sk, UDP))
3437 		return -EINVAL;
3438 
3439 	if (asoc) {
3440 		asoc->default_rcv_context = params.assoc_value;
3441 
3442 		return 0;
3443 	}
3444 
3445 	if (sctp_style(sk, TCP))
3446 		params.assoc_id = SCTP_FUTURE_ASSOC;
3447 
3448 	if (params.assoc_id == SCTP_FUTURE_ASSOC ||
3449 	    params.assoc_id == SCTP_ALL_ASSOC)
3450 		sp->default_rcv_context = params.assoc_value;
3451 
3452 	if (params.assoc_id == SCTP_CURRENT_ASSOC ||
3453 	    params.assoc_id == SCTP_ALL_ASSOC)
3454 		list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3455 			asoc->default_rcv_context = params.assoc_value;
3456 
3457 	return 0;
3458 }
3459 
3460 /*
3461  * 7.1.24.  Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3462  *
3463  * This options will at a minimum specify if the implementation is doing
3464  * fragmented interleave.  Fragmented interleave, for a one to many
3465  * socket, is when subsequent calls to receive a message may return
3466  * parts of messages from different associations.  Some implementations
3467  * may allow you to turn this value on or off.  If so, when turned off,
3468  * no fragment interleave will occur (which will cause a head of line
3469  * blocking amongst multiple associations sharing the same one to many
3470  * socket).  When this option is turned on, then each receive call may
3471  * come from a different association (thus the user must receive data
3472  * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3473  * association each receive belongs to.
3474  *
3475  * This option takes a boolean value.  A non-zero value indicates that
3476  * fragmented interleave is on.  A value of zero indicates that
3477  * fragmented interleave is off.
3478  *
3479  * Note that it is important that an implementation that allows this
3480  * option to be turned on, have it off by default.  Otherwise an unaware
3481  * application using the one to many model may become confused and act
3482  * incorrectly.
3483  */
3484 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3485 					       char __user *optval,
3486 					       unsigned int optlen)
3487 {
3488 	int val;
3489 
3490 	if (optlen != sizeof(int))
3491 		return -EINVAL;
3492 	if (get_user(val, (int __user *)optval))
3493 		return -EFAULT;
3494 
3495 	sctp_sk(sk)->frag_interleave = !!val;
3496 
3497 	if (!sctp_sk(sk)->frag_interleave)
3498 		sctp_sk(sk)->ep->intl_enable = 0;
3499 
3500 	return 0;
3501 }
3502 
3503 /*
3504  * 8.1.21.  Set or Get the SCTP Partial Delivery Point
3505  *       (SCTP_PARTIAL_DELIVERY_POINT)
3506  *
3507  * This option will set or get the SCTP partial delivery point.  This
3508  * point is the size of a message where the partial delivery API will be
3509  * invoked to help free up rwnd space for the peer.  Setting this to a
3510  * lower value will cause partial deliveries to happen more often.  The
3511  * calls argument is an integer that sets or gets the partial delivery
3512  * point.  Note also that the call will fail if the user attempts to set
3513  * this value larger than the socket receive buffer size.
3514  *
3515  * Note that any single message having a length smaller than or equal to
3516  * the SCTP partial delivery point will be delivered in one single read
3517  * call as long as the user provided buffer is large enough to hold the
3518  * message.
3519  */
3520 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3521 						  char __user *optval,
3522 						  unsigned int optlen)
3523 {
3524 	u32 val;
3525 
3526 	if (optlen != sizeof(u32))
3527 		return -EINVAL;
3528 	if (get_user(val, (int __user *)optval))
3529 		return -EFAULT;
3530 
3531 	/* Note: We double the receive buffer from what the user sets
3532 	 * it to be, also initial rwnd is based on rcvbuf/2.
3533 	 */
3534 	if (val > (sk->sk_rcvbuf >> 1))
3535 		return -EINVAL;
3536 
3537 	sctp_sk(sk)->pd_point = val;
3538 
3539 	return 0; /* is this the right error code? */
3540 }
3541 
3542 /*
3543  * 7.1.28.  Set or Get the maximum burst (SCTP_MAX_BURST)
3544  *
3545  * This option will allow a user to change the maximum burst of packets
3546  * that can be emitted by this association.  Note that the default value
3547  * is 4, and some implementations may restrict this setting so that it
3548  * can only be lowered.
3549  *
3550  * NOTE: This text doesn't seem right.  Do this on a socket basis with
3551  * future associations inheriting the socket value.
3552  */
3553 static int sctp_setsockopt_maxburst(struct sock *sk,
3554 				    char __user *optval,
3555 				    unsigned int optlen)
3556 {
3557 	struct sctp_sock *sp = sctp_sk(sk);
3558 	struct sctp_assoc_value params;
3559 	struct sctp_association *asoc;
3560 
3561 	if (optlen == sizeof(int)) {
3562 		pr_warn_ratelimited(DEPRECATED
3563 				    "%s (pid %d) "
3564 				    "Use of int in max_burst socket option deprecated.\n"
3565 				    "Use struct sctp_assoc_value instead\n",
3566 				    current->comm, task_pid_nr(current));
3567 		if (copy_from_user(&params.assoc_value, optval, optlen))
3568 			return -EFAULT;
3569 		params.assoc_id = SCTP_FUTURE_ASSOC;
3570 	} else if (optlen == sizeof(struct sctp_assoc_value)) {
3571 		if (copy_from_user(&params, optval, optlen))
3572 			return -EFAULT;
3573 	} else
3574 		return -EINVAL;
3575 
3576 	asoc = sctp_id2assoc(sk, params.assoc_id);
3577 	if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
3578 	    sctp_style(sk, UDP))
3579 		return -EINVAL;
3580 
3581 	if (asoc) {
3582 		asoc->max_burst = params.assoc_value;
3583 
3584 		return 0;
3585 	}
3586 
3587 	if (sctp_style(sk, TCP))
3588 		params.assoc_id = SCTP_FUTURE_ASSOC;
3589 
3590 	if (params.assoc_id == SCTP_FUTURE_ASSOC ||
3591 	    params.assoc_id == SCTP_ALL_ASSOC)
3592 		sp->max_burst = params.assoc_value;
3593 
3594 	if (params.assoc_id == SCTP_CURRENT_ASSOC ||
3595 	    params.assoc_id == SCTP_ALL_ASSOC)
3596 		list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3597 			asoc->max_burst = params.assoc_value;
3598 
3599 	return 0;
3600 }
3601 
3602 /*
3603  * 7.1.18.  Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3604  *
3605  * This set option adds a chunk type that the user is requesting to be
3606  * received only in an authenticated way.  Changes to the list of chunks
3607  * will only effect future associations on the socket.
3608  */
3609 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3610 				      char __user *optval,
3611 				      unsigned int optlen)
3612 {
3613 	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3614 	struct sctp_authchunk val;
3615 
3616 	if (!ep->auth_enable)
3617 		return -EACCES;
3618 
3619 	if (optlen != sizeof(struct sctp_authchunk))
3620 		return -EINVAL;
3621 	if (copy_from_user(&val, optval, optlen))
3622 		return -EFAULT;
3623 
3624 	switch (val.sauth_chunk) {
3625 	case SCTP_CID_INIT:
3626 	case SCTP_CID_INIT_ACK:
3627 	case SCTP_CID_SHUTDOWN_COMPLETE:
3628 	case SCTP_CID_AUTH:
3629 		return -EINVAL;
3630 	}
3631 
3632 	/* add this chunk id to the endpoint */
3633 	return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
3634 }
3635 
3636 /*
3637  * 7.1.19.  Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3638  *
3639  * This option gets or sets the list of HMAC algorithms that the local
3640  * endpoint requires the peer to use.
3641  */
3642 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3643 				      char __user *optval,
3644 				      unsigned int optlen)
3645 {
3646 	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3647 	struct sctp_hmacalgo *hmacs;
3648 	u32 idents;
3649 	int err;
3650 
3651 	if (!ep->auth_enable)
3652 		return -EACCES;
3653 
3654 	if (optlen < sizeof(struct sctp_hmacalgo))
3655 		return -EINVAL;
3656 	optlen = min_t(unsigned int, optlen, sizeof(struct sctp_hmacalgo) +
3657 					     SCTP_AUTH_NUM_HMACS * sizeof(u16));
3658 
3659 	hmacs = memdup_user(optval, optlen);
3660 	if (IS_ERR(hmacs))
3661 		return PTR_ERR(hmacs);
3662 
3663 	idents = hmacs->shmac_num_idents;
3664 	if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3665 	    (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3666 		err = -EINVAL;
3667 		goto out;
3668 	}
3669 
3670 	err = sctp_auth_ep_set_hmacs(ep, hmacs);
3671 out:
3672 	kfree(hmacs);
3673 	return err;
3674 }
3675 
3676 /*
3677  * 7.1.20.  Set a shared key (SCTP_AUTH_KEY)
3678  *
3679  * This option will set a shared secret key which is used to build an
3680  * association shared key.
3681  */
3682 static int sctp_setsockopt_auth_key(struct sock *sk,
3683 				    char __user *optval,
3684 				    unsigned int optlen)
3685 {
3686 	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3687 	struct sctp_authkey *authkey;
3688 	struct sctp_association *asoc;
3689 	int ret = -EINVAL;
3690 
3691 	if (optlen <= sizeof(struct sctp_authkey))
3692 		return -EINVAL;
3693 	/* authkey->sca_keylength is u16, so optlen can't be bigger than
3694 	 * this.
3695 	 */
3696 	optlen = min_t(unsigned int, optlen, USHRT_MAX + sizeof(*authkey));
3697 
3698 	authkey = memdup_user(optval, optlen);
3699 	if (IS_ERR(authkey))
3700 		return PTR_ERR(authkey);
3701 
3702 	if (authkey->sca_keylength > optlen - sizeof(*authkey))
3703 		goto out;
3704 
3705 	asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3706 	if (!asoc && authkey->sca_assoc_id > SCTP_ALL_ASSOC &&
3707 	    sctp_style(sk, UDP))
3708 		goto out;
3709 
3710 	if (asoc) {
3711 		ret = sctp_auth_set_key(ep, asoc, authkey);
3712 		goto out;
3713 	}
3714 
3715 	if (sctp_style(sk, TCP))
3716 		authkey->sca_assoc_id = SCTP_FUTURE_ASSOC;
3717 
3718 	if (authkey->sca_assoc_id == SCTP_FUTURE_ASSOC ||
3719 	    authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3720 		ret = sctp_auth_set_key(ep, asoc, authkey);
3721 		if (ret)
3722 			goto out;
3723 	}
3724 
3725 	ret = 0;
3726 
3727 	if (authkey->sca_assoc_id == SCTP_CURRENT_ASSOC ||
3728 	    authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3729 		list_for_each_entry(asoc, &ep->asocs, asocs) {
3730 			int res = sctp_auth_set_key(ep, asoc, authkey);
3731 
3732 			if (res && !ret)
3733 				ret = res;
3734 		}
3735 	}
3736 
3737 out:
3738 	kzfree(authkey);
3739 	return ret;
3740 }
3741 
3742 /*
3743  * 7.1.21.  Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3744  *
3745  * This option will get or set the active shared key to be used to build
3746  * the association shared key.
3747  */
3748 static int sctp_setsockopt_active_key(struct sock *sk,
3749 				      char __user *optval,
3750 				      unsigned int optlen)
3751 {
3752 	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3753 	struct sctp_association *asoc;
3754 	struct sctp_authkeyid val;
3755 	int ret = 0;
3756 
3757 	if (optlen != sizeof(struct sctp_authkeyid))
3758 		return -EINVAL;
3759 	if (copy_from_user(&val, optval, optlen))
3760 		return -EFAULT;
3761 
3762 	asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3763 	if (!asoc && val.scact_assoc_id > SCTP_ALL_ASSOC &&
3764 	    sctp_style(sk, UDP))
3765 		return -EINVAL;
3766 
3767 	if (asoc)
3768 		return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3769 
3770 	if (sctp_style(sk, TCP))
3771 		val.scact_assoc_id = SCTP_FUTURE_ASSOC;
3772 
3773 	if (val.scact_assoc_id == SCTP_FUTURE_ASSOC ||
3774 	    val.scact_assoc_id == SCTP_ALL_ASSOC) {
3775 		ret = sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3776 		if (ret)
3777 			return ret;
3778 	}
3779 
3780 	if (val.scact_assoc_id == SCTP_CURRENT_ASSOC ||
3781 	    val.scact_assoc_id == SCTP_ALL_ASSOC) {
3782 		list_for_each_entry(asoc, &ep->asocs, asocs) {
3783 			int res = sctp_auth_set_active_key(ep, asoc,
3784 							   val.scact_keynumber);
3785 
3786 			if (res && !ret)
3787 				ret = res;
3788 		}
3789 	}
3790 
3791 	return ret;
3792 }
3793 
3794 /*
3795  * 7.1.22.  Delete a shared key (SCTP_AUTH_DELETE_KEY)
3796  *
3797  * This set option will delete a shared secret key from use.
3798  */
3799 static int sctp_setsockopt_del_key(struct sock *sk,
3800 				   char __user *optval,
3801 				   unsigned int optlen)
3802 {
3803 	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3804 	struct sctp_association *asoc;
3805 	struct sctp_authkeyid val;
3806 	int ret = 0;
3807 
3808 	if (optlen != sizeof(struct sctp_authkeyid))
3809 		return -EINVAL;
3810 	if (copy_from_user(&val, optval, optlen))
3811 		return -EFAULT;
3812 
3813 	asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3814 	if (!asoc && val.scact_assoc_id > SCTP_ALL_ASSOC &&
3815 	    sctp_style(sk, UDP))
3816 		return -EINVAL;
3817 
3818 	if (asoc)
3819 		return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3820 
3821 	if (sctp_style(sk, TCP))
3822 		val.scact_assoc_id = SCTP_FUTURE_ASSOC;
3823 
3824 	if (val.scact_assoc_id == SCTP_FUTURE_ASSOC ||
3825 	    val.scact_assoc_id == SCTP_ALL_ASSOC) {
3826 		ret = sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3827 		if (ret)
3828 			return ret;
3829 	}
3830 
3831 	if (val.scact_assoc_id == SCTP_CURRENT_ASSOC ||
3832 	    val.scact_assoc_id == SCTP_ALL_ASSOC) {
3833 		list_for_each_entry(asoc, &ep->asocs, asocs) {
3834 			int res = sctp_auth_del_key_id(ep, asoc,
3835 						       val.scact_keynumber);
3836 
3837 			if (res && !ret)
3838 				ret = res;
3839 		}
3840 	}
3841 
3842 	return ret;
3843 }
3844 
3845 /*
3846  * 8.3.4  Deactivate a Shared Key (SCTP_AUTH_DEACTIVATE_KEY)
3847  *
3848  * This set option will deactivate a shared secret key.
3849  */
3850 static int sctp_setsockopt_deactivate_key(struct sock *sk, char __user *optval,
3851 					  unsigned int optlen)
3852 {
3853 	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3854 	struct sctp_association *asoc;
3855 	struct sctp_authkeyid val;
3856 	int ret = 0;
3857 
3858 	if (optlen != sizeof(struct sctp_authkeyid))
3859 		return -EINVAL;
3860 	if (copy_from_user(&val, optval, optlen))
3861 		return -EFAULT;
3862 
3863 	asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3864 	if (!asoc && val.scact_assoc_id > SCTP_ALL_ASSOC &&
3865 	    sctp_style(sk, UDP))
3866 		return -EINVAL;
3867 
3868 	if (asoc)
3869 		return sctp_auth_deact_key_id(ep, asoc, val.scact_keynumber);
3870 
3871 	if (sctp_style(sk, TCP))
3872 		val.scact_assoc_id = SCTP_FUTURE_ASSOC;
3873 
3874 	if (val.scact_assoc_id == SCTP_FUTURE_ASSOC ||
3875 	    val.scact_assoc_id == SCTP_ALL_ASSOC) {
3876 		ret = sctp_auth_deact_key_id(ep, asoc, val.scact_keynumber);
3877 		if (ret)
3878 			return ret;
3879 	}
3880 
3881 	if (val.scact_assoc_id == SCTP_CURRENT_ASSOC ||
3882 	    val.scact_assoc_id == SCTP_ALL_ASSOC) {
3883 		list_for_each_entry(asoc, &ep->asocs, asocs) {
3884 			int res = sctp_auth_deact_key_id(ep, asoc,
3885 							 val.scact_keynumber);
3886 
3887 			if (res && !ret)
3888 				ret = res;
3889 		}
3890 	}
3891 
3892 	return ret;
3893 }
3894 
3895 /*
3896  * 8.1.23 SCTP_AUTO_ASCONF
3897  *
3898  * This option will enable or disable the use of the automatic generation of
3899  * ASCONF chunks to add and delete addresses to an existing association.  Note
3900  * that this option has two caveats namely: a) it only affects sockets that
3901  * are bound to all addresses available to the SCTP stack, and b) the system
3902  * administrator may have an overriding control that turns the ASCONF feature
3903  * off no matter what setting the socket option may have.
3904  * This option expects an integer boolean flag, where a non-zero value turns on
3905  * the option, and a zero value turns off the option.
3906  * Note. In this implementation, socket operation overrides default parameter
3907  * being set by sysctl as well as FreeBSD implementation
3908  */
3909 static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3910 					unsigned int optlen)
3911 {
3912 	int val;
3913 	struct sctp_sock *sp = sctp_sk(sk);
3914 
3915 	if (optlen < sizeof(int))
3916 		return -EINVAL;
3917 	if (get_user(val, (int __user *)optval))
3918 		return -EFAULT;
3919 	if (!sctp_is_ep_boundall(sk) && val)
3920 		return -EINVAL;
3921 	if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3922 		return 0;
3923 
3924 	spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3925 	if (val == 0 && sp->do_auto_asconf) {
3926 		list_del(&sp->auto_asconf_list);
3927 		sp->do_auto_asconf = 0;
3928 	} else if (val && !sp->do_auto_asconf) {
3929 		list_add_tail(&sp->auto_asconf_list,
3930 		    &sock_net(sk)->sctp.auto_asconf_splist);
3931 		sp->do_auto_asconf = 1;
3932 	}
3933 	spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3934 	return 0;
3935 }
3936 
3937 /*
3938  * SCTP_PEER_ADDR_THLDS
3939  *
3940  * This option allows us to alter the partially failed threshold for one or all
3941  * transports in an association.  See Section 6.1 of:
3942  * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3943  */
3944 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3945 					    char __user *optval,
3946 					    unsigned int optlen, bool v2)
3947 {
3948 	struct sctp_paddrthlds_v2 val;
3949 	struct sctp_transport *trans;
3950 	struct sctp_association *asoc;
3951 	int len;
3952 
3953 	len = v2 ? sizeof(val) : sizeof(struct sctp_paddrthlds);
3954 	if (optlen < len)
3955 		return -EINVAL;
3956 	if (copy_from_user(&val, optval, len))
3957 		return -EFAULT;
3958 
3959 	if (v2 && val.spt_pathpfthld > val.spt_pathcpthld)
3960 		return -EINVAL;
3961 
3962 	if (!sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
3963 		trans = sctp_addr_id2transport(sk, &val.spt_address,
3964 					       val.spt_assoc_id);
3965 		if (!trans)
3966 			return -ENOENT;
3967 
3968 		if (val.spt_pathmaxrxt)
3969 			trans->pathmaxrxt = val.spt_pathmaxrxt;
3970 		if (v2)
3971 			trans->ps_retrans = val.spt_pathcpthld;
3972 		trans->pf_retrans = val.spt_pathpfthld;
3973 
3974 		return 0;
3975 	}
3976 
3977 	asoc = sctp_id2assoc(sk, val.spt_assoc_id);
3978 	if (!asoc && val.spt_assoc_id != SCTP_FUTURE_ASSOC &&
3979 	    sctp_style(sk, UDP))
3980 		return -EINVAL;
3981 
3982 	if (asoc) {
3983 		list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3984 				    transports) {
3985 			if (val.spt_pathmaxrxt)
3986 				trans->pathmaxrxt = val.spt_pathmaxrxt;
3987 			if (v2)
3988 				trans->ps_retrans = val.spt_pathcpthld;
3989 			trans->pf_retrans = val.spt_pathpfthld;
3990 		}
3991 
3992 		if (val.spt_pathmaxrxt)
3993 			asoc->pathmaxrxt = val.spt_pathmaxrxt;
3994 		if (v2)
3995 			asoc->ps_retrans = val.spt_pathcpthld;
3996 		asoc->pf_retrans = val.spt_pathpfthld;
3997 	} else {
3998 		struct sctp_sock *sp = sctp_sk(sk);
3999 
4000 		if (val.spt_pathmaxrxt)
4001 			sp->pathmaxrxt = val.spt_pathmaxrxt;
4002 		if (v2)
4003 			sp->ps_retrans = val.spt_pathcpthld;
4004 		sp->pf_retrans = val.spt_pathpfthld;
4005 	}
4006 
4007 	return 0;
4008 }
4009 
4010 static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
4011 				       char __user *optval,
4012 				       unsigned int optlen)
4013 {
4014 	int val;
4015 
4016 	if (optlen < sizeof(int))
4017 		return -EINVAL;
4018 	if (get_user(val, (int __user *) optval))
4019 		return -EFAULT;
4020 
4021 	sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;
4022 
4023 	return 0;
4024 }
4025 
4026 static int sctp_setsockopt_recvnxtinfo(struct sock *sk,
4027 				       char __user *optval,
4028 				       unsigned int optlen)
4029 {
4030 	int val;
4031 
4032 	if (optlen < sizeof(int))
4033 		return -EINVAL;
4034 	if (get_user(val, (int __user *) optval))
4035 		return -EFAULT;
4036 
4037 	sctp_sk(sk)->recvnxtinfo = (val == 0) ? 0 : 1;
4038 
4039 	return 0;
4040 }
4041 
4042 static int sctp_setsockopt_pr_supported(struct sock *sk,
4043 					char __user *optval,
4044 					unsigned int optlen)
4045 {
4046 	struct sctp_assoc_value params;
4047 	struct sctp_association *asoc;
4048 
4049 	if (optlen != sizeof(params))
4050 		return -EINVAL;
4051 
4052 	if (copy_from_user(&params, optval, optlen))
4053 		return -EFAULT;
4054 
4055 	asoc = sctp_id2assoc(sk, params.assoc_id);
4056 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4057 	    sctp_style(sk, UDP))
4058 		return -EINVAL;
4059 
4060 	sctp_sk(sk)->ep->prsctp_enable = !!params.assoc_value;
4061 
4062 	return 0;
4063 }
4064 
4065 static int sctp_setsockopt_default_prinfo(struct sock *sk,
4066 					  char __user *optval,
4067 					  unsigned int optlen)
4068 {
4069 	struct sctp_sock *sp = sctp_sk(sk);
4070 	struct sctp_default_prinfo info;
4071 	struct sctp_association *asoc;
4072 	int retval = -EINVAL;
4073 
4074 	if (optlen != sizeof(info))
4075 		goto out;
4076 
4077 	if (copy_from_user(&info, optval, sizeof(info))) {
4078 		retval = -EFAULT;
4079 		goto out;
4080 	}
4081 
4082 	if (info.pr_policy & ~SCTP_PR_SCTP_MASK)
4083 		goto out;
4084 
4085 	if (info.pr_policy == SCTP_PR_SCTP_NONE)
4086 		info.pr_value = 0;
4087 
4088 	asoc = sctp_id2assoc(sk, info.pr_assoc_id);
4089 	if (!asoc && info.pr_assoc_id > SCTP_ALL_ASSOC &&
4090 	    sctp_style(sk, UDP))
4091 		goto out;
4092 
4093 	retval = 0;
4094 
4095 	if (asoc) {
4096 		SCTP_PR_SET_POLICY(asoc->default_flags, info.pr_policy);
4097 		asoc->default_timetolive = info.pr_value;
4098 		goto out;
4099 	}
4100 
4101 	if (sctp_style(sk, TCP))
4102 		info.pr_assoc_id = SCTP_FUTURE_ASSOC;
4103 
4104 	if (info.pr_assoc_id == SCTP_FUTURE_ASSOC ||
4105 	    info.pr_assoc_id == SCTP_ALL_ASSOC) {
4106 		SCTP_PR_SET_POLICY(sp->default_flags, info.pr_policy);
4107 		sp->default_timetolive = info.pr_value;
4108 	}
4109 
4110 	if (info.pr_assoc_id == SCTP_CURRENT_ASSOC ||
4111 	    info.pr_assoc_id == SCTP_ALL_ASSOC) {
4112 		list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4113 			SCTP_PR_SET_POLICY(asoc->default_flags, info.pr_policy);
4114 			asoc->default_timetolive = info.pr_value;
4115 		}
4116 	}
4117 
4118 out:
4119 	return retval;
4120 }
4121 
4122 static int sctp_setsockopt_reconfig_supported(struct sock *sk,
4123 					      char __user *optval,
4124 					      unsigned int optlen)
4125 {
4126 	struct sctp_assoc_value params;
4127 	struct sctp_association *asoc;
4128 	int retval = -EINVAL;
4129 
4130 	if (optlen != sizeof(params))
4131 		goto out;
4132 
4133 	if (copy_from_user(&params, optval, optlen)) {
4134 		retval = -EFAULT;
4135 		goto out;
4136 	}
4137 
4138 	asoc = sctp_id2assoc(sk, params.assoc_id);
4139 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4140 	    sctp_style(sk, UDP))
4141 		goto out;
4142 
4143 	sctp_sk(sk)->ep->reconf_enable = !!params.assoc_value;
4144 
4145 	retval = 0;
4146 
4147 out:
4148 	return retval;
4149 }
4150 
4151 static int sctp_setsockopt_enable_strreset(struct sock *sk,
4152 					   char __user *optval,
4153 					   unsigned int optlen)
4154 {
4155 	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
4156 	struct sctp_assoc_value params;
4157 	struct sctp_association *asoc;
4158 	int retval = -EINVAL;
4159 
4160 	if (optlen != sizeof(params))
4161 		goto out;
4162 
4163 	if (copy_from_user(&params, optval, optlen)) {
4164 		retval = -EFAULT;
4165 		goto out;
4166 	}
4167 
4168 	if (params.assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
4169 		goto out;
4170 
4171 	asoc = sctp_id2assoc(sk, params.assoc_id);
4172 	if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
4173 	    sctp_style(sk, UDP))
4174 		goto out;
4175 
4176 	retval = 0;
4177 
4178 	if (asoc) {
4179 		asoc->strreset_enable = params.assoc_value;
4180 		goto out;
4181 	}
4182 
4183 	if (sctp_style(sk, TCP))
4184 		params.assoc_id = SCTP_FUTURE_ASSOC;
4185 
4186 	if (params.assoc_id == SCTP_FUTURE_ASSOC ||
4187 	    params.assoc_id == SCTP_ALL_ASSOC)
4188 		ep->strreset_enable = params.assoc_value;
4189 
4190 	if (params.assoc_id == SCTP_CURRENT_ASSOC ||
4191 	    params.assoc_id == SCTP_ALL_ASSOC)
4192 		list_for_each_entry(asoc, &ep->asocs, asocs)
4193 			asoc->strreset_enable = params.assoc_value;
4194 
4195 out:
4196 	return retval;
4197 }
4198 
4199 static int sctp_setsockopt_reset_streams(struct sock *sk,
4200 					 char __user *optval,
4201 					 unsigned int optlen)
4202 {
4203 	struct sctp_reset_streams *params;
4204 	struct sctp_association *asoc;
4205 	int retval = -EINVAL;
4206 
4207 	if (optlen < sizeof(*params))
4208 		return -EINVAL;
4209 	/* srs_number_streams is u16, so optlen can't be bigger than this. */
4210 	optlen = min_t(unsigned int, optlen, USHRT_MAX +
4211 					     sizeof(__u16) * sizeof(*params));
4212 
4213 	params = memdup_user(optval, optlen);
4214 	if (IS_ERR(params))
4215 		return PTR_ERR(params);
4216 
4217 	if (params->srs_number_streams * sizeof(__u16) >
4218 	    optlen - sizeof(*params))
4219 		goto out;
4220 
4221 	asoc = sctp_id2assoc(sk, params->srs_assoc_id);
4222 	if (!asoc)
4223 		goto out;
4224 
4225 	retval = sctp_send_reset_streams(asoc, params);
4226 
4227 out:
4228 	kfree(params);
4229 	return retval;
4230 }
4231 
4232 static int sctp_setsockopt_reset_assoc(struct sock *sk,
4233 				       char __user *optval,
4234 				       unsigned int optlen)
4235 {
4236 	struct sctp_association *asoc;
4237 	sctp_assoc_t associd;
4238 	int retval = -EINVAL;
4239 
4240 	if (optlen != sizeof(associd))
4241 		goto out;
4242 
4243 	if (copy_from_user(&associd, optval, optlen)) {
4244 		retval = -EFAULT;
4245 		goto out;
4246 	}
4247 
4248 	asoc = sctp_id2assoc(sk, associd);
4249 	if (!asoc)
4250 		goto out;
4251 
4252 	retval = sctp_send_reset_assoc(asoc);
4253 
4254 out:
4255 	return retval;
4256 }
4257 
4258 static int sctp_setsockopt_add_streams(struct sock *sk,
4259 				       char __user *optval,
4260 				       unsigned int optlen)
4261 {
4262 	struct sctp_association *asoc;
4263 	struct sctp_add_streams params;
4264 	int retval = -EINVAL;
4265 
4266 	if (optlen != sizeof(params))
4267 		goto out;
4268 
4269 	if (copy_from_user(&params, optval, optlen)) {
4270 		retval = -EFAULT;
4271 		goto out;
4272 	}
4273 
4274 	asoc = sctp_id2assoc(sk, params.sas_assoc_id);
4275 	if (!asoc)
4276 		goto out;
4277 
4278 	retval = sctp_send_add_streams(asoc, &params);
4279 
4280 out:
4281 	return retval;
4282 }
4283 
4284 static int sctp_setsockopt_scheduler(struct sock *sk,
4285 				     char __user *optval,
4286 				     unsigned int optlen)
4287 {
4288 	struct sctp_sock *sp = sctp_sk(sk);
4289 	struct sctp_association *asoc;
4290 	struct sctp_assoc_value params;
4291 	int retval = 0;
4292 
4293 	if (optlen < sizeof(params))
4294 		return -EINVAL;
4295 
4296 	optlen = sizeof(params);
4297 	if (copy_from_user(&params, optval, optlen))
4298 		return -EFAULT;
4299 
4300 	if (params.assoc_value > SCTP_SS_MAX)
4301 		return -EINVAL;
4302 
4303 	asoc = sctp_id2assoc(sk, params.assoc_id);
4304 	if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
4305 	    sctp_style(sk, UDP))
4306 		return -EINVAL;
4307 
4308 	if (asoc)
4309 		return sctp_sched_set_sched(asoc, params.assoc_value);
4310 
4311 	if (sctp_style(sk, TCP))
4312 		params.assoc_id = SCTP_FUTURE_ASSOC;
4313 
4314 	if (params.assoc_id == SCTP_FUTURE_ASSOC ||
4315 	    params.assoc_id == SCTP_ALL_ASSOC)
4316 		sp->default_ss = params.assoc_value;
4317 
4318 	if (params.assoc_id == SCTP_CURRENT_ASSOC ||
4319 	    params.assoc_id == SCTP_ALL_ASSOC) {
4320 		list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4321 			int ret = sctp_sched_set_sched(asoc,
4322 						       params.assoc_value);
4323 
4324 			if (ret && !retval)
4325 				retval = ret;
4326 		}
4327 	}
4328 
4329 	return retval;
4330 }
4331 
4332 static int sctp_setsockopt_scheduler_value(struct sock *sk,
4333 					   char __user *optval,
4334 					   unsigned int optlen)
4335 {
4336 	struct sctp_stream_value params;
4337 	struct sctp_association *asoc;
4338 	int retval = -EINVAL;
4339 
4340 	if (optlen < sizeof(params))
4341 		goto out;
4342 
4343 	optlen = sizeof(params);
4344 	if (copy_from_user(&params, optval, optlen)) {
4345 		retval = -EFAULT;
4346 		goto out;
4347 	}
4348 
4349 	asoc = sctp_id2assoc(sk, params.assoc_id);
4350 	if (!asoc && params.assoc_id != SCTP_CURRENT_ASSOC &&
4351 	    sctp_style(sk, UDP))
4352 		goto out;
4353 
4354 	if (asoc) {
4355 		retval = sctp_sched_set_value(asoc, params.stream_id,
4356 					      params.stream_value, GFP_KERNEL);
4357 		goto out;
4358 	}
4359 
4360 	retval = 0;
4361 
4362 	list_for_each_entry(asoc, &sctp_sk(sk)->ep->asocs, asocs) {
4363 		int ret = sctp_sched_set_value(asoc, params.stream_id,
4364 					       params.stream_value, GFP_KERNEL);
4365 		if (ret && !retval) /* try to return the 1st error. */
4366 			retval = ret;
4367 	}
4368 
4369 out:
4370 	return retval;
4371 }
4372 
4373 static int sctp_setsockopt_interleaving_supported(struct sock *sk,
4374 						  char __user *optval,
4375 						  unsigned int optlen)
4376 {
4377 	struct sctp_sock *sp = sctp_sk(sk);
4378 	struct sctp_assoc_value params;
4379 	struct sctp_association *asoc;
4380 	int retval = -EINVAL;
4381 
4382 	if (optlen < sizeof(params))
4383 		goto out;
4384 
4385 	optlen = sizeof(params);
4386 	if (copy_from_user(&params, optval, optlen)) {
4387 		retval = -EFAULT;
4388 		goto out;
4389 	}
4390 
4391 	asoc = sctp_id2assoc(sk, params.assoc_id);
4392 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4393 	    sctp_style(sk, UDP))
4394 		goto out;
4395 
4396 	if (!sock_net(sk)->sctp.intl_enable || !sp->frag_interleave) {
4397 		retval = -EPERM;
4398 		goto out;
4399 	}
4400 
4401 	sp->ep->intl_enable = !!params.assoc_value;
4402 
4403 	retval = 0;
4404 
4405 out:
4406 	return retval;
4407 }
4408 
4409 static int sctp_setsockopt_reuse_port(struct sock *sk, char __user *optval,
4410 				      unsigned int optlen)
4411 {
4412 	int val;
4413 
4414 	if (!sctp_style(sk, TCP))
4415 		return -EOPNOTSUPP;
4416 
4417 	if (sctp_sk(sk)->ep->base.bind_addr.port)
4418 		return -EFAULT;
4419 
4420 	if (optlen < sizeof(int))
4421 		return -EINVAL;
4422 
4423 	if (get_user(val, (int __user *)optval))
4424 		return -EFAULT;
4425 
4426 	sctp_sk(sk)->reuse = !!val;
4427 
4428 	return 0;
4429 }
4430 
4431 static int sctp_assoc_ulpevent_type_set(struct sctp_event *param,
4432 					struct sctp_association *asoc)
4433 {
4434 	struct sctp_ulpevent *event;
4435 
4436 	sctp_ulpevent_type_set(&asoc->subscribe, param->se_type, param->se_on);
4437 
4438 	if (param->se_type == SCTP_SENDER_DRY_EVENT && param->se_on) {
4439 		if (sctp_outq_is_empty(&asoc->outqueue)) {
4440 			event = sctp_ulpevent_make_sender_dry_event(asoc,
4441 					GFP_USER | __GFP_NOWARN);
4442 			if (!event)
4443 				return -ENOMEM;
4444 
4445 			asoc->stream.si->enqueue_event(&asoc->ulpq, event);
4446 		}
4447 	}
4448 
4449 	return 0;
4450 }
4451 
4452 static int sctp_setsockopt_event(struct sock *sk, char __user *optval,
4453 				 unsigned int optlen)
4454 {
4455 	struct sctp_sock *sp = sctp_sk(sk);
4456 	struct sctp_association *asoc;
4457 	struct sctp_event param;
4458 	int retval = 0;
4459 
4460 	if (optlen < sizeof(param))
4461 		return -EINVAL;
4462 
4463 	optlen = sizeof(param);
4464 	if (copy_from_user(&param, optval, optlen))
4465 		return -EFAULT;
4466 
4467 	if (param.se_type < SCTP_SN_TYPE_BASE ||
4468 	    param.se_type > SCTP_SN_TYPE_MAX)
4469 		return -EINVAL;
4470 
4471 	asoc = sctp_id2assoc(sk, param.se_assoc_id);
4472 	if (!asoc && param.se_assoc_id > SCTP_ALL_ASSOC &&
4473 	    sctp_style(sk, UDP))
4474 		return -EINVAL;
4475 
4476 	if (asoc)
4477 		return sctp_assoc_ulpevent_type_set(&param, asoc);
4478 
4479 	if (sctp_style(sk, TCP))
4480 		param.se_assoc_id = SCTP_FUTURE_ASSOC;
4481 
4482 	if (param.se_assoc_id == SCTP_FUTURE_ASSOC ||
4483 	    param.se_assoc_id == SCTP_ALL_ASSOC)
4484 		sctp_ulpevent_type_set(&sp->subscribe,
4485 				       param.se_type, param.se_on);
4486 
4487 	if (param.se_assoc_id == SCTP_CURRENT_ASSOC ||
4488 	    param.se_assoc_id == SCTP_ALL_ASSOC) {
4489 		list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4490 			int ret = sctp_assoc_ulpevent_type_set(&param, asoc);
4491 
4492 			if (ret && !retval)
4493 				retval = ret;
4494 		}
4495 	}
4496 
4497 	return retval;
4498 }
4499 
4500 static int sctp_setsockopt_asconf_supported(struct sock *sk,
4501 					    char __user *optval,
4502 					    unsigned int optlen)
4503 {
4504 	struct sctp_assoc_value params;
4505 	struct sctp_association *asoc;
4506 	struct sctp_endpoint *ep;
4507 	int retval = -EINVAL;
4508 
4509 	if (optlen != sizeof(params))
4510 		goto out;
4511 
4512 	if (copy_from_user(&params, optval, optlen)) {
4513 		retval = -EFAULT;
4514 		goto out;
4515 	}
4516 
4517 	asoc = sctp_id2assoc(sk, params.assoc_id);
4518 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4519 	    sctp_style(sk, UDP))
4520 		goto out;
4521 
4522 	ep = sctp_sk(sk)->ep;
4523 	ep->asconf_enable = !!params.assoc_value;
4524 
4525 	if (ep->asconf_enable && ep->auth_enable) {
4526 		sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4527 		sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4528 	}
4529 
4530 	retval = 0;
4531 
4532 out:
4533 	return retval;
4534 }
4535 
4536 static int sctp_setsockopt_auth_supported(struct sock *sk,
4537 					  char __user *optval,
4538 					  unsigned int optlen)
4539 {
4540 	struct sctp_assoc_value params;
4541 	struct sctp_association *asoc;
4542 	struct sctp_endpoint *ep;
4543 	int retval = -EINVAL;
4544 
4545 	if (optlen != sizeof(params))
4546 		goto out;
4547 
4548 	if (copy_from_user(&params, optval, optlen)) {
4549 		retval = -EFAULT;
4550 		goto out;
4551 	}
4552 
4553 	asoc = sctp_id2assoc(sk, params.assoc_id);
4554 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4555 	    sctp_style(sk, UDP))
4556 		goto out;
4557 
4558 	ep = sctp_sk(sk)->ep;
4559 	if (params.assoc_value) {
4560 		retval = sctp_auth_init(ep, GFP_KERNEL);
4561 		if (retval)
4562 			goto out;
4563 		if (ep->asconf_enable) {
4564 			sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4565 			sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4566 		}
4567 	}
4568 
4569 	ep->auth_enable = !!params.assoc_value;
4570 	retval = 0;
4571 
4572 out:
4573 	return retval;
4574 }
4575 
4576 static int sctp_setsockopt_ecn_supported(struct sock *sk,
4577 					 char __user *optval,
4578 					 unsigned int optlen)
4579 {
4580 	struct sctp_assoc_value params;
4581 	struct sctp_association *asoc;
4582 	int retval = -EINVAL;
4583 
4584 	if (optlen != sizeof(params))
4585 		goto out;
4586 
4587 	if (copy_from_user(&params, optval, optlen)) {
4588 		retval = -EFAULT;
4589 		goto out;
4590 	}
4591 
4592 	asoc = sctp_id2assoc(sk, params.assoc_id);
4593 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4594 	    sctp_style(sk, UDP))
4595 		goto out;
4596 
4597 	sctp_sk(sk)->ep->ecn_enable = !!params.assoc_value;
4598 	retval = 0;
4599 
4600 out:
4601 	return retval;
4602 }
4603 
4604 static int sctp_setsockopt_pf_expose(struct sock *sk,
4605 				     char __user *optval,
4606 				     unsigned int optlen)
4607 {
4608 	struct sctp_assoc_value params;
4609 	struct sctp_association *asoc;
4610 	int retval = -EINVAL;
4611 
4612 	if (optlen != sizeof(params))
4613 		goto out;
4614 
4615 	if (copy_from_user(&params, optval, optlen)) {
4616 		retval = -EFAULT;
4617 		goto out;
4618 	}
4619 
4620 	if (params.assoc_value > SCTP_PF_EXPOSE_MAX)
4621 		goto out;
4622 
4623 	asoc = sctp_id2assoc(sk, params.assoc_id);
4624 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4625 	    sctp_style(sk, UDP))
4626 		goto out;
4627 
4628 	if (asoc)
4629 		asoc->pf_expose = params.assoc_value;
4630 	else
4631 		sctp_sk(sk)->pf_expose = params.assoc_value;
4632 	retval = 0;
4633 
4634 out:
4635 	return retval;
4636 }
4637 
4638 /* API 6.2 setsockopt(), getsockopt()
4639  *
4640  * Applications use setsockopt() and getsockopt() to set or retrieve
4641  * socket options.  Socket options are used to change the default
4642  * behavior of sockets calls.  They are described in Section 7.
4643  *
4644  * The syntax is:
4645  *
4646  *   ret = getsockopt(int sd, int level, int optname, void __user *optval,
4647  *                    int __user *optlen);
4648  *   ret = setsockopt(int sd, int level, int optname, const void __user *optval,
4649  *                    int optlen);
4650  *
4651  *   sd      - the socket descript.
4652  *   level   - set to IPPROTO_SCTP for all SCTP options.
4653  *   optname - the option name.
4654  *   optval  - the buffer to store the value of the option.
4655  *   optlen  - the size of the buffer.
4656  */
4657 static int sctp_setsockopt(struct sock *sk, int level, int optname,
4658 			   char __user *optval, unsigned int optlen)
4659 {
4660 	int retval = 0;
4661 
4662 	pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
4663 
4664 	/* I can hardly begin to describe how wrong this is.  This is
4665 	 * so broken as to be worse than useless.  The API draft
4666 	 * REALLY is NOT helpful here...  I am not convinced that the
4667 	 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
4668 	 * are at all well-founded.
4669 	 */
4670 	if (level != SOL_SCTP) {
4671 		struct sctp_af *af = sctp_sk(sk)->pf->af;
4672 		retval = af->setsockopt(sk, level, optname, optval, optlen);
4673 		goto out_nounlock;
4674 	}
4675 
4676 	lock_sock(sk);
4677 
4678 	switch (optname) {
4679 	case SCTP_SOCKOPT_BINDX_ADD:
4680 		/* 'optlen' is the size of the addresses buffer. */
4681 		retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
4682 					       optlen, SCTP_BINDX_ADD_ADDR);
4683 		break;
4684 
4685 	case SCTP_SOCKOPT_BINDX_REM:
4686 		/* 'optlen' is the size of the addresses buffer. */
4687 		retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
4688 					       optlen, SCTP_BINDX_REM_ADDR);
4689 		break;
4690 
4691 	case SCTP_SOCKOPT_CONNECTX_OLD:
4692 		/* 'optlen' is the size of the addresses buffer. */
4693 		retval = sctp_setsockopt_connectx_old(sk,
4694 					    (struct sockaddr __user *)optval,
4695 					    optlen);
4696 		break;
4697 
4698 	case SCTP_SOCKOPT_CONNECTX:
4699 		/* 'optlen' is the size of the addresses buffer. */
4700 		retval = sctp_setsockopt_connectx(sk,
4701 					    (struct sockaddr __user *)optval,
4702 					    optlen);
4703 		break;
4704 
4705 	case SCTP_DISABLE_FRAGMENTS:
4706 		retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
4707 		break;
4708 
4709 	case SCTP_EVENTS:
4710 		retval = sctp_setsockopt_events(sk, optval, optlen);
4711 		break;
4712 
4713 	case SCTP_AUTOCLOSE:
4714 		retval = sctp_setsockopt_autoclose(sk, optval, optlen);
4715 		break;
4716 
4717 	case SCTP_PEER_ADDR_PARAMS:
4718 		retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
4719 		break;
4720 
4721 	case SCTP_DELAYED_SACK:
4722 		retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
4723 		break;
4724 	case SCTP_PARTIAL_DELIVERY_POINT:
4725 		retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
4726 		break;
4727 
4728 	case SCTP_INITMSG:
4729 		retval = sctp_setsockopt_initmsg(sk, optval, optlen);
4730 		break;
4731 	case SCTP_DEFAULT_SEND_PARAM:
4732 		retval = sctp_setsockopt_default_send_param(sk, optval,
4733 							    optlen);
4734 		break;
4735 	case SCTP_DEFAULT_SNDINFO:
4736 		retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
4737 		break;
4738 	case SCTP_PRIMARY_ADDR:
4739 		retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
4740 		break;
4741 	case SCTP_SET_PEER_PRIMARY_ADDR:
4742 		retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
4743 		break;
4744 	case SCTP_NODELAY:
4745 		retval = sctp_setsockopt_nodelay(sk, optval, optlen);
4746 		break;
4747 	case SCTP_RTOINFO:
4748 		retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
4749 		break;
4750 	case SCTP_ASSOCINFO:
4751 		retval = sctp_setsockopt_associnfo(sk, optval, optlen);
4752 		break;
4753 	case SCTP_I_WANT_MAPPED_V4_ADDR:
4754 		retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
4755 		break;
4756 	case SCTP_MAXSEG:
4757 		retval = sctp_setsockopt_maxseg(sk, optval, optlen);
4758 		break;
4759 	case SCTP_ADAPTATION_LAYER:
4760 		retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
4761 		break;
4762 	case SCTP_CONTEXT:
4763 		retval = sctp_setsockopt_context(sk, optval, optlen);
4764 		break;
4765 	case SCTP_FRAGMENT_INTERLEAVE:
4766 		retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
4767 		break;
4768 	case SCTP_MAX_BURST:
4769 		retval = sctp_setsockopt_maxburst(sk, optval, optlen);
4770 		break;
4771 	case SCTP_AUTH_CHUNK:
4772 		retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
4773 		break;
4774 	case SCTP_HMAC_IDENT:
4775 		retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
4776 		break;
4777 	case SCTP_AUTH_KEY:
4778 		retval = sctp_setsockopt_auth_key(sk, optval, optlen);
4779 		break;
4780 	case SCTP_AUTH_ACTIVE_KEY:
4781 		retval = sctp_setsockopt_active_key(sk, optval, optlen);
4782 		break;
4783 	case SCTP_AUTH_DELETE_KEY:
4784 		retval = sctp_setsockopt_del_key(sk, optval, optlen);
4785 		break;
4786 	case SCTP_AUTH_DEACTIVATE_KEY:
4787 		retval = sctp_setsockopt_deactivate_key(sk, optval, optlen);
4788 		break;
4789 	case SCTP_AUTO_ASCONF:
4790 		retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
4791 		break;
4792 	case SCTP_PEER_ADDR_THLDS:
4793 		retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen,
4794 							  false);
4795 		break;
4796 	case SCTP_PEER_ADDR_THLDS_V2:
4797 		retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen,
4798 							  true);
4799 		break;
4800 	case SCTP_RECVRCVINFO:
4801 		retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
4802 		break;
4803 	case SCTP_RECVNXTINFO:
4804 		retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
4805 		break;
4806 	case SCTP_PR_SUPPORTED:
4807 		retval = sctp_setsockopt_pr_supported(sk, optval, optlen);
4808 		break;
4809 	case SCTP_DEFAULT_PRINFO:
4810 		retval = sctp_setsockopt_default_prinfo(sk, optval, optlen);
4811 		break;
4812 	case SCTP_RECONFIG_SUPPORTED:
4813 		retval = sctp_setsockopt_reconfig_supported(sk, optval, optlen);
4814 		break;
4815 	case SCTP_ENABLE_STREAM_RESET:
4816 		retval = sctp_setsockopt_enable_strreset(sk, optval, optlen);
4817 		break;
4818 	case SCTP_RESET_STREAMS:
4819 		retval = sctp_setsockopt_reset_streams(sk, optval, optlen);
4820 		break;
4821 	case SCTP_RESET_ASSOC:
4822 		retval = sctp_setsockopt_reset_assoc(sk, optval, optlen);
4823 		break;
4824 	case SCTP_ADD_STREAMS:
4825 		retval = sctp_setsockopt_add_streams(sk, optval, optlen);
4826 		break;
4827 	case SCTP_STREAM_SCHEDULER:
4828 		retval = sctp_setsockopt_scheduler(sk, optval, optlen);
4829 		break;
4830 	case SCTP_STREAM_SCHEDULER_VALUE:
4831 		retval = sctp_setsockopt_scheduler_value(sk, optval, optlen);
4832 		break;
4833 	case SCTP_INTERLEAVING_SUPPORTED:
4834 		retval = sctp_setsockopt_interleaving_supported(sk, optval,
4835 								optlen);
4836 		break;
4837 	case SCTP_REUSE_PORT:
4838 		retval = sctp_setsockopt_reuse_port(sk, optval, optlen);
4839 		break;
4840 	case SCTP_EVENT:
4841 		retval = sctp_setsockopt_event(sk, optval, optlen);
4842 		break;
4843 	case SCTP_ASCONF_SUPPORTED:
4844 		retval = sctp_setsockopt_asconf_supported(sk, optval, optlen);
4845 		break;
4846 	case SCTP_AUTH_SUPPORTED:
4847 		retval = sctp_setsockopt_auth_supported(sk, optval, optlen);
4848 		break;
4849 	case SCTP_ECN_SUPPORTED:
4850 		retval = sctp_setsockopt_ecn_supported(sk, optval, optlen);
4851 		break;
4852 	case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
4853 		retval = sctp_setsockopt_pf_expose(sk, optval, optlen);
4854 		break;
4855 	default:
4856 		retval = -ENOPROTOOPT;
4857 		break;
4858 	}
4859 
4860 	release_sock(sk);
4861 
4862 out_nounlock:
4863 	return retval;
4864 }
4865 
4866 /* API 3.1.6 connect() - UDP Style Syntax
4867  *
4868  * An application may use the connect() call in the UDP model to initiate an
4869  * association without sending data.
4870  *
4871  * The syntax is:
4872  *
4873  * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4874  *
4875  * sd: the socket descriptor to have a new association added to.
4876  *
4877  * nam: the address structure (either struct sockaddr_in or struct
4878  *    sockaddr_in6 defined in RFC2553 [7]).
4879  *
4880  * len: the size of the address.
4881  */
4882 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
4883 			int addr_len, int flags)
4884 {
4885 	struct sctp_af *af;
4886 	int err = -EINVAL;
4887 
4888 	lock_sock(sk);
4889 	pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
4890 		 addr, addr_len);
4891 
4892 	/* Validate addr_len before calling common connect/connectx routine. */
4893 	af = sctp_get_af_specific(addr->sa_family);
4894 	if (af && addr_len >= af->sockaddr_len)
4895 		err = __sctp_connect(sk, addr, af->sockaddr_len, flags, NULL);
4896 
4897 	release_sock(sk);
4898 	return err;
4899 }
4900 
4901 int sctp_inet_connect(struct socket *sock, struct sockaddr *uaddr,
4902 		      int addr_len, int flags)
4903 {
4904 	if (addr_len < sizeof(uaddr->sa_family))
4905 		return -EINVAL;
4906 
4907 	if (uaddr->sa_family == AF_UNSPEC)
4908 		return -EOPNOTSUPP;
4909 
4910 	return sctp_connect(sock->sk, uaddr, addr_len, flags);
4911 }
4912 
4913 /* FIXME: Write comments. */
4914 static int sctp_disconnect(struct sock *sk, int flags)
4915 {
4916 	return -EOPNOTSUPP; /* STUB */
4917 }
4918 
4919 /* 4.1.4 accept() - TCP Style Syntax
4920  *
4921  * Applications use accept() call to remove an established SCTP
4922  * association from the accept queue of the endpoint.  A new socket
4923  * descriptor will be returned from accept() to represent the newly
4924  * formed association.
4925  */
4926 static struct sock *sctp_accept(struct sock *sk, int flags, int *err, bool kern)
4927 {
4928 	struct sctp_sock *sp;
4929 	struct sctp_endpoint *ep;
4930 	struct sock *newsk = NULL;
4931 	struct sctp_association *asoc;
4932 	long timeo;
4933 	int error = 0;
4934 
4935 	lock_sock(sk);
4936 
4937 	sp = sctp_sk(sk);
4938 	ep = sp->ep;
4939 
4940 	if (!sctp_style(sk, TCP)) {
4941 		error = -EOPNOTSUPP;
4942 		goto out;
4943 	}
4944 
4945 	if (!sctp_sstate(sk, LISTENING)) {
4946 		error = -EINVAL;
4947 		goto out;
4948 	}
4949 
4950 	timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
4951 
4952 	error = sctp_wait_for_accept(sk, timeo);
4953 	if (error)
4954 		goto out;
4955 
4956 	/* We treat the list of associations on the endpoint as the accept
4957 	 * queue and pick the first association on the list.
4958 	 */
4959 	asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
4960 
4961 	newsk = sp->pf->create_accept_sk(sk, asoc, kern);
4962 	if (!newsk) {
4963 		error = -ENOMEM;
4964 		goto out;
4965 	}
4966 
4967 	/* Populate the fields of the newsk from the oldsk and migrate the
4968 	 * asoc to the newsk.
4969 	 */
4970 	error = sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
4971 	if (error) {
4972 		sk_common_release(newsk);
4973 		newsk = NULL;
4974 	}
4975 
4976 out:
4977 	release_sock(sk);
4978 	*err = error;
4979 	return newsk;
4980 }
4981 
4982 /* The SCTP ioctl handler. */
4983 static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
4984 {
4985 	int rc = -ENOTCONN;
4986 
4987 	lock_sock(sk);
4988 
4989 	/*
4990 	 * SEQPACKET-style sockets in LISTENING state are valid, for
4991 	 * SCTP, so only discard TCP-style sockets in LISTENING state.
4992 	 */
4993 	if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4994 		goto out;
4995 
4996 	switch (cmd) {
4997 	case SIOCINQ: {
4998 		struct sk_buff *skb;
4999 		unsigned int amount = 0;
5000 
5001 		skb = skb_peek(&sk->sk_receive_queue);
5002 		if (skb != NULL) {
5003 			/*
5004 			 * We will only return the amount of this packet since
5005 			 * that is all that will be read.
5006 			 */
5007 			amount = skb->len;
5008 		}
5009 		rc = put_user(amount, (int __user *)arg);
5010 		break;
5011 	}
5012 	default:
5013 		rc = -ENOIOCTLCMD;
5014 		break;
5015 	}
5016 out:
5017 	release_sock(sk);
5018 	return rc;
5019 }
5020 
5021 /* This is the function which gets called during socket creation to
5022  * initialized the SCTP-specific portion of the sock.
5023  * The sock structure should already be zero-filled memory.
5024  */
5025 static int sctp_init_sock(struct sock *sk)
5026 {
5027 	struct net *net = sock_net(sk);
5028 	struct sctp_sock *sp;
5029 
5030 	pr_debug("%s: sk:%p\n", __func__, sk);
5031 
5032 	sp = sctp_sk(sk);
5033 
5034 	/* Initialize the SCTP per socket area.  */
5035 	switch (sk->sk_type) {
5036 	case SOCK_SEQPACKET:
5037 		sp->type = SCTP_SOCKET_UDP;
5038 		break;
5039 	case SOCK_STREAM:
5040 		sp->type = SCTP_SOCKET_TCP;
5041 		break;
5042 	default:
5043 		return -ESOCKTNOSUPPORT;
5044 	}
5045 
5046 	sk->sk_gso_type = SKB_GSO_SCTP;
5047 
5048 	/* Initialize default send parameters. These parameters can be
5049 	 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
5050 	 */
5051 	sp->default_stream = 0;
5052 	sp->default_ppid = 0;
5053 	sp->default_flags = 0;
5054 	sp->default_context = 0;
5055 	sp->default_timetolive = 0;
5056 
5057 	sp->default_rcv_context = 0;
5058 	sp->max_burst = net->sctp.max_burst;
5059 
5060 	sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
5061 
5062 	/* Initialize default setup parameters. These parameters
5063 	 * can be modified with the SCTP_INITMSG socket option or
5064 	 * overridden by the SCTP_INIT CMSG.
5065 	 */
5066 	sp->initmsg.sinit_num_ostreams   = sctp_max_outstreams;
5067 	sp->initmsg.sinit_max_instreams  = sctp_max_instreams;
5068 	sp->initmsg.sinit_max_attempts   = net->sctp.max_retrans_init;
5069 	sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
5070 
5071 	/* Initialize default RTO related parameters.  These parameters can
5072 	 * be modified for with the SCTP_RTOINFO socket option.
5073 	 */
5074 	sp->rtoinfo.srto_initial = net->sctp.rto_initial;
5075 	sp->rtoinfo.srto_max     = net->sctp.rto_max;
5076 	sp->rtoinfo.srto_min     = net->sctp.rto_min;
5077 
5078 	/* Initialize default association related parameters. These parameters
5079 	 * can be modified with the SCTP_ASSOCINFO socket option.
5080 	 */
5081 	sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
5082 	sp->assocparams.sasoc_number_peer_destinations = 0;
5083 	sp->assocparams.sasoc_peer_rwnd = 0;
5084 	sp->assocparams.sasoc_local_rwnd = 0;
5085 	sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
5086 
5087 	/* Initialize default event subscriptions. By default, all the
5088 	 * options are off.
5089 	 */
5090 	sp->subscribe = 0;
5091 
5092 	/* Default Peer Address Parameters.  These defaults can
5093 	 * be modified via SCTP_PEER_ADDR_PARAMS
5094 	 */
5095 	sp->hbinterval  = net->sctp.hb_interval;
5096 	sp->pathmaxrxt  = net->sctp.max_retrans_path;
5097 	sp->pf_retrans  = net->sctp.pf_retrans;
5098 	sp->ps_retrans  = net->sctp.ps_retrans;
5099 	sp->pf_expose   = net->sctp.pf_expose;
5100 	sp->pathmtu     = 0; /* allow default discovery */
5101 	sp->sackdelay   = net->sctp.sack_timeout;
5102 	sp->sackfreq	= 2;
5103 	sp->param_flags = SPP_HB_ENABLE |
5104 			  SPP_PMTUD_ENABLE |
5105 			  SPP_SACKDELAY_ENABLE;
5106 	sp->default_ss = SCTP_SS_DEFAULT;
5107 
5108 	/* If enabled no SCTP message fragmentation will be performed.
5109 	 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
5110 	 */
5111 	sp->disable_fragments = 0;
5112 
5113 	/* Enable Nagle algorithm by default.  */
5114 	sp->nodelay           = 0;
5115 
5116 	sp->recvrcvinfo = 0;
5117 	sp->recvnxtinfo = 0;
5118 
5119 	/* Enable by default. */
5120 	sp->v4mapped          = 1;
5121 
5122 	/* Auto-close idle associations after the configured
5123 	 * number of seconds.  A value of 0 disables this
5124 	 * feature.  Configure through the SCTP_AUTOCLOSE socket option,
5125 	 * for UDP-style sockets only.
5126 	 */
5127 	sp->autoclose         = 0;
5128 
5129 	/* User specified fragmentation limit. */
5130 	sp->user_frag         = 0;
5131 
5132 	sp->adaptation_ind = 0;
5133 
5134 	sp->pf = sctp_get_pf_specific(sk->sk_family);
5135 
5136 	/* Control variables for partial data delivery. */
5137 	atomic_set(&sp->pd_mode, 0);
5138 	skb_queue_head_init(&sp->pd_lobby);
5139 	sp->frag_interleave = 0;
5140 
5141 	/* Create a per socket endpoint structure.  Even if we
5142 	 * change the data structure relationships, this may still
5143 	 * be useful for storing pre-connect address information.
5144 	 */
5145 	sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
5146 	if (!sp->ep)
5147 		return -ENOMEM;
5148 
5149 	sp->hmac = NULL;
5150 
5151 	sk->sk_destruct = sctp_destruct_sock;
5152 
5153 	SCTP_DBG_OBJCNT_INC(sock);
5154 
5155 	local_bh_disable();
5156 	sk_sockets_allocated_inc(sk);
5157 	sock_prot_inuse_add(net, sk->sk_prot, 1);
5158 
5159 	/* Nothing can fail after this block, otherwise
5160 	 * sctp_destroy_sock() will be called without addr_wq_lock held
5161 	 */
5162 	if (net->sctp.default_auto_asconf) {
5163 		spin_lock(&sock_net(sk)->sctp.addr_wq_lock);
5164 		list_add_tail(&sp->auto_asconf_list,
5165 		    &net->sctp.auto_asconf_splist);
5166 		sp->do_auto_asconf = 1;
5167 		spin_unlock(&sock_net(sk)->sctp.addr_wq_lock);
5168 	} else {
5169 		sp->do_auto_asconf = 0;
5170 	}
5171 
5172 	local_bh_enable();
5173 
5174 	return 0;
5175 }
5176 
5177 /* Cleanup any SCTP per socket resources. Must be called with
5178  * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
5179  */
5180 static void sctp_destroy_sock(struct sock *sk)
5181 {
5182 	struct sctp_sock *sp;
5183 
5184 	pr_debug("%s: sk:%p\n", __func__, sk);
5185 
5186 	/* Release our hold on the endpoint. */
5187 	sp = sctp_sk(sk);
5188 	/* This could happen during socket init, thus we bail out
5189 	 * early, since the rest of the below is not setup either.
5190 	 */
5191 	if (sp->ep == NULL)
5192 		return;
5193 
5194 	if (sp->do_auto_asconf) {
5195 		sp->do_auto_asconf = 0;
5196 		list_del(&sp->auto_asconf_list);
5197 	}
5198 	sctp_endpoint_free(sp->ep);
5199 	local_bh_disable();
5200 	sk_sockets_allocated_dec(sk);
5201 	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
5202 	local_bh_enable();
5203 }
5204 
5205 /* Triggered when there are no references on the socket anymore */
5206 static void sctp_destruct_sock(struct sock *sk)
5207 {
5208 	struct sctp_sock *sp = sctp_sk(sk);
5209 
5210 	/* Free up the HMAC transform. */
5211 	crypto_free_shash(sp->hmac);
5212 
5213 	inet_sock_destruct(sk);
5214 }
5215 
5216 /* API 4.1.7 shutdown() - TCP Style Syntax
5217  *     int shutdown(int socket, int how);
5218  *
5219  *     sd      - the socket descriptor of the association to be closed.
5220  *     how     - Specifies the type of shutdown.  The  values  are
5221  *               as follows:
5222  *               SHUT_RD
5223  *                     Disables further receive operations. No SCTP
5224  *                     protocol action is taken.
5225  *               SHUT_WR
5226  *                     Disables further send operations, and initiates
5227  *                     the SCTP shutdown sequence.
5228  *               SHUT_RDWR
5229  *                     Disables further send  and  receive  operations
5230  *                     and initiates the SCTP shutdown sequence.
5231  */
5232 static void sctp_shutdown(struct sock *sk, int how)
5233 {
5234 	struct net *net = sock_net(sk);
5235 	struct sctp_endpoint *ep;
5236 
5237 	if (!sctp_style(sk, TCP))
5238 		return;
5239 
5240 	ep = sctp_sk(sk)->ep;
5241 	if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
5242 		struct sctp_association *asoc;
5243 
5244 		inet_sk_set_state(sk, SCTP_SS_CLOSING);
5245 		asoc = list_entry(ep->asocs.next,
5246 				  struct sctp_association, asocs);
5247 		sctp_primitive_SHUTDOWN(net, asoc, NULL);
5248 	}
5249 }
5250 
5251 int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
5252 		       struct sctp_info *info)
5253 {
5254 	struct sctp_transport *prim;
5255 	struct list_head *pos;
5256 	int mask;
5257 
5258 	memset(info, 0, sizeof(*info));
5259 	if (!asoc) {
5260 		struct sctp_sock *sp = sctp_sk(sk);
5261 
5262 		info->sctpi_s_autoclose = sp->autoclose;
5263 		info->sctpi_s_adaptation_ind = sp->adaptation_ind;
5264 		info->sctpi_s_pd_point = sp->pd_point;
5265 		info->sctpi_s_nodelay = sp->nodelay;
5266 		info->sctpi_s_disable_fragments = sp->disable_fragments;
5267 		info->sctpi_s_v4mapped = sp->v4mapped;
5268 		info->sctpi_s_frag_interleave = sp->frag_interleave;
5269 		info->sctpi_s_type = sp->type;
5270 
5271 		return 0;
5272 	}
5273 
5274 	info->sctpi_tag = asoc->c.my_vtag;
5275 	info->sctpi_state = asoc->state;
5276 	info->sctpi_rwnd = asoc->a_rwnd;
5277 	info->sctpi_unackdata = asoc->unack_data;
5278 	info->sctpi_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5279 	info->sctpi_instrms = asoc->stream.incnt;
5280 	info->sctpi_outstrms = asoc->stream.outcnt;
5281 	list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
5282 		info->sctpi_inqueue++;
5283 	list_for_each(pos, &asoc->outqueue.out_chunk_list)
5284 		info->sctpi_outqueue++;
5285 	info->sctpi_overall_error = asoc->overall_error_count;
5286 	info->sctpi_max_burst = asoc->max_burst;
5287 	info->sctpi_maxseg = asoc->frag_point;
5288 	info->sctpi_peer_rwnd = asoc->peer.rwnd;
5289 	info->sctpi_peer_tag = asoc->c.peer_vtag;
5290 
5291 	mask = asoc->peer.ecn_capable << 1;
5292 	mask = (mask | asoc->peer.ipv4_address) << 1;
5293 	mask = (mask | asoc->peer.ipv6_address) << 1;
5294 	mask = (mask | asoc->peer.hostname_address) << 1;
5295 	mask = (mask | asoc->peer.asconf_capable) << 1;
5296 	mask = (mask | asoc->peer.prsctp_capable) << 1;
5297 	mask = (mask | asoc->peer.auth_capable);
5298 	info->sctpi_peer_capable = mask;
5299 	mask = asoc->peer.sack_needed << 1;
5300 	mask = (mask | asoc->peer.sack_generation) << 1;
5301 	mask = (mask | asoc->peer.zero_window_announced);
5302 	info->sctpi_peer_sack = mask;
5303 
5304 	info->sctpi_isacks = asoc->stats.isacks;
5305 	info->sctpi_osacks = asoc->stats.osacks;
5306 	info->sctpi_opackets = asoc->stats.opackets;
5307 	info->sctpi_ipackets = asoc->stats.ipackets;
5308 	info->sctpi_rtxchunks = asoc->stats.rtxchunks;
5309 	info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
5310 	info->sctpi_idupchunks = asoc->stats.idupchunks;
5311 	info->sctpi_gapcnt = asoc->stats.gapcnt;
5312 	info->sctpi_ouodchunks = asoc->stats.ouodchunks;
5313 	info->sctpi_iuodchunks = asoc->stats.iuodchunks;
5314 	info->sctpi_oodchunks = asoc->stats.oodchunks;
5315 	info->sctpi_iodchunks = asoc->stats.iodchunks;
5316 	info->sctpi_octrlchunks = asoc->stats.octrlchunks;
5317 	info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;
5318 
5319 	prim = asoc->peer.primary_path;
5320 	memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
5321 	info->sctpi_p_state = prim->state;
5322 	info->sctpi_p_cwnd = prim->cwnd;
5323 	info->sctpi_p_srtt = prim->srtt;
5324 	info->sctpi_p_rto = jiffies_to_msecs(prim->rto);
5325 	info->sctpi_p_hbinterval = prim->hbinterval;
5326 	info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
5327 	info->sctpi_p_sackdelay = jiffies_to_msecs(prim->sackdelay);
5328 	info->sctpi_p_ssthresh = prim->ssthresh;
5329 	info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
5330 	info->sctpi_p_flight_size = prim->flight_size;
5331 	info->sctpi_p_error = prim->error_count;
5332 
5333 	return 0;
5334 }
5335 EXPORT_SYMBOL_GPL(sctp_get_sctp_info);
5336 
5337 /* use callback to avoid exporting the core structure */
5338 void sctp_transport_walk_start(struct rhashtable_iter *iter)
5339 {
5340 	rhltable_walk_enter(&sctp_transport_hashtable, iter);
5341 
5342 	rhashtable_walk_start(iter);
5343 }
5344 
5345 void sctp_transport_walk_stop(struct rhashtable_iter *iter)
5346 {
5347 	rhashtable_walk_stop(iter);
5348 	rhashtable_walk_exit(iter);
5349 }
5350 
5351 struct sctp_transport *sctp_transport_get_next(struct net *net,
5352 					       struct rhashtable_iter *iter)
5353 {
5354 	struct sctp_transport *t;
5355 
5356 	t = rhashtable_walk_next(iter);
5357 	for (; t; t = rhashtable_walk_next(iter)) {
5358 		if (IS_ERR(t)) {
5359 			if (PTR_ERR(t) == -EAGAIN)
5360 				continue;
5361 			break;
5362 		}
5363 
5364 		if (!sctp_transport_hold(t))
5365 			continue;
5366 
5367 		if (net_eq(sock_net(t->asoc->base.sk), net) &&
5368 		    t->asoc->peer.primary_path == t)
5369 			break;
5370 
5371 		sctp_transport_put(t);
5372 	}
5373 
5374 	return t;
5375 }
5376 
5377 struct sctp_transport *sctp_transport_get_idx(struct net *net,
5378 					      struct rhashtable_iter *iter,
5379 					      int pos)
5380 {
5381 	struct sctp_transport *t;
5382 
5383 	if (!pos)
5384 		return SEQ_START_TOKEN;
5385 
5386 	while ((t = sctp_transport_get_next(net, iter)) && !IS_ERR(t)) {
5387 		if (!--pos)
5388 			break;
5389 		sctp_transport_put(t);
5390 	}
5391 
5392 	return t;
5393 }
5394 
5395 int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
5396 			   void *p) {
5397 	int err = 0;
5398 	int hash = 0;
5399 	struct sctp_ep_common *epb;
5400 	struct sctp_hashbucket *head;
5401 
5402 	for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
5403 	     hash++, head++) {
5404 		read_lock_bh(&head->lock);
5405 		sctp_for_each_hentry(epb, &head->chain) {
5406 			err = cb(sctp_ep(epb), p);
5407 			if (err)
5408 				break;
5409 		}
5410 		read_unlock_bh(&head->lock);
5411 	}
5412 
5413 	return err;
5414 }
5415 EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
5416 
5417 int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
5418 				  struct net *net,
5419 				  const union sctp_addr *laddr,
5420 				  const union sctp_addr *paddr, void *p)
5421 {
5422 	struct sctp_transport *transport;
5423 	int err;
5424 
5425 	rcu_read_lock();
5426 	transport = sctp_addrs_lookup_transport(net, laddr, paddr);
5427 	rcu_read_unlock();
5428 	if (!transport)
5429 		return -ENOENT;
5430 
5431 	err = cb(transport, p);
5432 	sctp_transport_put(transport);
5433 
5434 	return err;
5435 }
5436 EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
5437 
5438 int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
5439 			    int (*cb_done)(struct sctp_transport *, void *),
5440 			    struct net *net, int *pos, void *p) {
5441 	struct rhashtable_iter hti;
5442 	struct sctp_transport *tsp;
5443 	int ret;
5444 
5445 again:
5446 	ret = 0;
5447 	sctp_transport_walk_start(&hti);
5448 
5449 	tsp = sctp_transport_get_idx(net, &hti, *pos + 1);
5450 	for (; !IS_ERR_OR_NULL(tsp); tsp = sctp_transport_get_next(net, &hti)) {
5451 		ret = cb(tsp, p);
5452 		if (ret)
5453 			break;
5454 		(*pos)++;
5455 		sctp_transport_put(tsp);
5456 	}
5457 	sctp_transport_walk_stop(&hti);
5458 
5459 	if (ret) {
5460 		if (cb_done && !cb_done(tsp, p)) {
5461 			(*pos)++;
5462 			sctp_transport_put(tsp);
5463 			goto again;
5464 		}
5465 		sctp_transport_put(tsp);
5466 	}
5467 
5468 	return ret;
5469 }
5470 EXPORT_SYMBOL_GPL(sctp_for_each_transport);
5471 
5472 /* 7.2.1 Association Status (SCTP_STATUS)
5473 
5474  * Applications can retrieve current status information about an
5475  * association, including association state, peer receiver window size,
5476  * number of unacked data chunks, and number of data chunks pending
5477  * receipt.  This information is read-only.
5478  */
5479 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
5480 				       char __user *optval,
5481 				       int __user *optlen)
5482 {
5483 	struct sctp_status status;
5484 	struct sctp_association *asoc = NULL;
5485 	struct sctp_transport *transport;
5486 	sctp_assoc_t associd;
5487 	int retval = 0;
5488 
5489 	if (len < sizeof(status)) {
5490 		retval = -EINVAL;
5491 		goto out;
5492 	}
5493 
5494 	len = sizeof(status);
5495 	if (copy_from_user(&status, optval, len)) {
5496 		retval = -EFAULT;
5497 		goto out;
5498 	}
5499 
5500 	associd = status.sstat_assoc_id;
5501 	asoc = sctp_id2assoc(sk, associd);
5502 	if (!asoc) {
5503 		retval = -EINVAL;
5504 		goto out;
5505 	}
5506 
5507 	transport = asoc->peer.primary_path;
5508 
5509 	status.sstat_assoc_id = sctp_assoc2id(asoc);
5510 	status.sstat_state = sctp_assoc_to_state(asoc);
5511 	status.sstat_rwnd =  asoc->peer.rwnd;
5512 	status.sstat_unackdata = asoc->unack_data;
5513 
5514 	status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5515 	status.sstat_instrms = asoc->stream.incnt;
5516 	status.sstat_outstrms = asoc->stream.outcnt;
5517 	status.sstat_fragmentation_point = asoc->frag_point;
5518 	status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5519 	memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
5520 			transport->af_specific->sockaddr_len);
5521 	/* Map ipv4 address into v4-mapped-on-v6 address.  */
5522 	sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
5523 		(union sctp_addr *)&status.sstat_primary.spinfo_address);
5524 	status.sstat_primary.spinfo_state = transport->state;
5525 	status.sstat_primary.spinfo_cwnd = transport->cwnd;
5526 	status.sstat_primary.spinfo_srtt = transport->srtt;
5527 	status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
5528 	status.sstat_primary.spinfo_mtu = transport->pathmtu;
5529 
5530 	if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
5531 		status.sstat_primary.spinfo_state = SCTP_ACTIVE;
5532 
5533 	if (put_user(len, optlen)) {
5534 		retval = -EFAULT;
5535 		goto out;
5536 	}
5537 
5538 	pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
5539 		 __func__, len, status.sstat_state, status.sstat_rwnd,
5540 		 status.sstat_assoc_id);
5541 
5542 	if (copy_to_user(optval, &status, len)) {
5543 		retval = -EFAULT;
5544 		goto out;
5545 	}
5546 
5547 out:
5548 	return retval;
5549 }
5550 
5551 
5552 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
5553  *
5554  * Applications can retrieve information about a specific peer address
5555  * of an association, including its reachability state, congestion
5556  * window, and retransmission timer values.  This information is
5557  * read-only.
5558  */
5559 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
5560 					  char __user *optval,
5561 					  int __user *optlen)
5562 {
5563 	struct sctp_paddrinfo pinfo;
5564 	struct sctp_transport *transport;
5565 	int retval = 0;
5566 
5567 	if (len < sizeof(pinfo)) {
5568 		retval = -EINVAL;
5569 		goto out;
5570 	}
5571 
5572 	len = sizeof(pinfo);
5573 	if (copy_from_user(&pinfo, optval, len)) {
5574 		retval = -EFAULT;
5575 		goto out;
5576 	}
5577 
5578 	transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
5579 					   pinfo.spinfo_assoc_id);
5580 	if (!transport) {
5581 		retval = -EINVAL;
5582 		goto out;
5583 	}
5584 
5585 	if (transport->state == SCTP_PF &&
5586 	    transport->asoc->pf_expose == SCTP_PF_EXPOSE_DISABLE) {
5587 		retval = -EACCES;
5588 		goto out;
5589 	}
5590 
5591 	pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5592 	pinfo.spinfo_state = transport->state;
5593 	pinfo.spinfo_cwnd = transport->cwnd;
5594 	pinfo.spinfo_srtt = transport->srtt;
5595 	pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
5596 	pinfo.spinfo_mtu = transport->pathmtu;
5597 
5598 	if (pinfo.spinfo_state == SCTP_UNKNOWN)
5599 		pinfo.spinfo_state = SCTP_ACTIVE;
5600 
5601 	if (put_user(len, optlen)) {
5602 		retval = -EFAULT;
5603 		goto out;
5604 	}
5605 
5606 	if (copy_to_user(optval, &pinfo, len)) {
5607 		retval = -EFAULT;
5608 		goto out;
5609 	}
5610 
5611 out:
5612 	return retval;
5613 }
5614 
5615 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
5616  *
5617  * This option is a on/off flag.  If enabled no SCTP message
5618  * fragmentation will be performed.  Instead if a message being sent
5619  * exceeds the current PMTU size, the message will NOT be sent and
5620  * instead a error will be indicated to the user.
5621  */
5622 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
5623 					char __user *optval, int __user *optlen)
5624 {
5625 	int val;
5626 
5627 	if (len < sizeof(int))
5628 		return -EINVAL;
5629 
5630 	len = sizeof(int);
5631 	val = (sctp_sk(sk)->disable_fragments == 1);
5632 	if (put_user(len, optlen))
5633 		return -EFAULT;
5634 	if (copy_to_user(optval, &val, len))
5635 		return -EFAULT;
5636 	return 0;
5637 }
5638 
5639 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
5640  *
5641  * This socket option is used to specify various notifications and
5642  * ancillary data the user wishes to receive.
5643  */
5644 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
5645 				  int __user *optlen)
5646 {
5647 	struct sctp_event_subscribe subscribe;
5648 	__u8 *sn_type = (__u8 *)&subscribe;
5649 	int i;
5650 
5651 	if (len == 0)
5652 		return -EINVAL;
5653 	if (len > sizeof(struct sctp_event_subscribe))
5654 		len = sizeof(struct sctp_event_subscribe);
5655 	if (put_user(len, optlen))
5656 		return -EFAULT;
5657 
5658 	for (i = 0; i < len; i++)
5659 		sn_type[i] = sctp_ulpevent_type_enabled(sctp_sk(sk)->subscribe,
5660 							SCTP_SN_TYPE_BASE + i);
5661 
5662 	if (copy_to_user(optval, &subscribe, len))
5663 		return -EFAULT;
5664 
5665 	return 0;
5666 }
5667 
5668 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
5669  *
5670  * This socket option is applicable to the UDP-style socket only.  When
5671  * set it will cause associations that are idle for more than the
5672  * specified number of seconds to automatically close.  An association
5673  * being idle is defined an association that has NOT sent or received
5674  * user data.  The special value of '0' indicates that no automatic
5675  * close of any associations should be performed.  The option expects an
5676  * integer defining the number of seconds of idle time before an
5677  * association is closed.
5678  */
5679 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
5680 {
5681 	/* Applicable to UDP-style socket only */
5682 	if (sctp_style(sk, TCP))
5683 		return -EOPNOTSUPP;
5684 	if (len < sizeof(int))
5685 		return -EINVAL;
5686 	len = sizeof(int);
5687 	if (put_user(len, optlen))
5688 		return -EFAULT;
5689 	if (put_user(sctp_sk(sk)->autoclose, (int __user *)optval))
5690 		return -EFAULT;
5691 	return 0;
5692 }
5693 
5694 /* Helper routine to branch off an association to a new socket.  */
5695 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
5696 {
5697 	struct sctp_association *asoc = sctp_id2assoc(sk, id);
5698 	struct sctp_sock *sp = sctp_sk(sk);
5699 	struct socket *sock;
5700 	int err = 0;
5701 
5702 	/* Do not peel off from one netns to another one. */
5703 	if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
5704 		return -EINVAL;
5705 
5706 	if (!asoc)
5707 		return -EINVAL;
5708 
5709 	/* An association cannot be branched off from an already peeled-off
5710 	 * socket, nor is this supported for tcp style sockets.
5711 	 */
5712 	if (!sctp_style(sk, UDP))
5713 		return -EINVAL;
5714 
5715 	/* Create a new socket.  */
5716 	err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
5717 	if (err < 0)
5718 		return err;
5719 
5720 	sctp_copy_sock(sock->sk, sk, asoc);
5721 
5722 	/* Make peeled-off sockets more like 1-1 accepted sockets.
5723 	 * Set the daddr and initialize id to something more random and also
5724 	 * copy over any ip options.
5725 	 */
5726 	sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
5727 	sp->pf->copy_ip_options(sk, sock->sk);
5728 
5729 	/* Populate the fields of the newsk from the oldsk and migrate the
5730 	 * asoc to the newsk.
5731 	 */
5732 	err = sctp_sock_migrate(sk, sock->sk, asoc,
5733 				SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
5734 	if (err) {
5735 		sock_release(sock);
5736 		sock = NULL;
5737 	}
5738 
5739 	*sockp = sock;
5740 
5741 	return err;
5742 }
5743 EXPORT_SYMBOL(sctp_do_peeloff);
5744 
5745 static int sctp_getsockopt_peeloff_common(struct sock *sk, sctp_peeloff_arg_t *peeloff,
5746 					  struct file **newfile, unsigned flags)
5747 {
5748 	struct socket *newsock;
5749 	int retval;
5750 
5751 	retval = sctp_do_peeloff(sk, peeloff->associd, &newsock);
5752 	if (retval < 0)
5753 		goto out;
5754 
5755 	/* Map the socket to an unused fd that can be returned to the user.  */
5756 	retval = get_unused_fd_flags(flags & SOCK_CLOEXEC);
5757 	if (retval < 0) {
5758 		sock_release(newsock);
5759 		goto out;
5760 	}
5761 
5762 	*newfile = sock_alloc_file(newsock, 0, NULL);
5763 	if (IS_ERR(*newfile)) {
5764 		put_unused_fd(retval);
5765 		retval = PTR_ERR(*newfile);
5766 		*newfile = NULL;
5767 		return retval;
5768 	}
5769 
5770 	pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
5771 		 retval);
5772 
5773 	peeloff->sd = retval;
5774 
5775 	if (flags & SOCK_NONBLOCK)
5776 		(*newfile)->f_flags |= O_NONBLOCK;
5777 out:
5778 	return retval;
5779 }
5780 
5781 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
5782 {
5783 	sctp_peeloff_arg_t peeloff;
5784 	struct file *newfile = NULL;
5785 	int retval = 0;
5786 
5787 	if (len < sizeof(sctp_peeloff_arg_t))
5788 		return -EINVAL;
5789 	len = sizeof(sctp_peeloff_arg_t);
5790 	if (copy_from_user(&peeloff, optval, len))
5791 		return -EFAULT;
5792 
5793 	retval = sctp_getsockopt_peeloff_common(sk, &peeloff, &newfile, 0);
5794 	if (retval < 0)
5795 		goto out;
5796 
5797 	/* Return the fd mapped to the new socket.  */
5798 	if (put_user(len, optlen)) {
5799 		fput(newfile);
5800 		put_unused_fd(retval);
5801 		return -EFAULT;
5802 	}
5803 
5804 	if (copy_to_user(optval, &peeloff, len)) {
5805 		fput(newfile);
5806 		put_unused_fd(retval);
5807 		return -EFAULT;
5808 	}
5809 	fd_install(retval, newfile);
5810 out:
5811 	return retval;
5812 }
5813 
5814 static int sctp_getsockopt_peeloff_flags(struct sock *sk, int len,
5815 					 char __user *optval, int __user *optlen)
5816 {
5817 	sctp_peeloff_flags_arg_t peeloff;
5818 	struct file *newfile = NULL;
5819 	int retval = 0;
5820 
5821 	if (len < sizeof(sctp_peeloff_flags_arg_t))
5822 		return -EINVAL;
5823 	len = sizeof(sctp_peeloff_flags_arg_t);
5824 	if (copy_from_user(&peeloff, optval, len))
5825 		return -EFAULT;
5826 
5827 	retval = sctp_getsockopt_peeloff_common(sk, &peeloff.p_arg,
5828 						&newfile, peeloff.flags);
5829 	if (retval < 0)
5830 		goto out;
5831 
5832 	/* Return the fd mapped to the new socket.  */
5833 	if (put_user(len, optlen)) {
5834 		fput(newfile);
5835 		put_unused_fd(retval);
5836 		return -EFAULT;
5837 	}
5838 
5839 	if (copy_to_user(optval, &peeloff, len)) {
5840 		fput(newfile);
5841 		put_unused_fd(retval);
5842 		return -EFAULT;
5843 	}
5844 	fd_install(retval, newfile);
5845 out:
5846 	return retval;
5847 }
5848 
5849 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
5850  *
5851  * Applications can enable or disable heartbeats for any peer address of
5852  * an association, modify an address's heartbeat interval, force a
5853  * heartbeat to be sent immediately, and adjust the address's maximum
5854  * number of retransmissions sent before an address is considered
5855  * unreachable.  The following structure is used to access and modify an
5856  * address's parameters:
5857  *
5858  *  struct sctp_paddrparams {
5859  *     sctp_assoc_t            spp_assoc_id;
5860  *     struct sockaddr_storage spp_address;
5861  *     uint32_t                spp_hbinterval;
5862  *     uint16_t                spp_pathmaxrxt;
5863  *     uint32_t                spp_pathmtu;
5864  *     uint32_t                spp_sackdelay;
5865  *     uint32_t                spp_flags;
5866  * };
5867  *
5868  *   spp_assoc_id    - (one-to-many style socket) This is filled in the
5869  *                     application, and identifies the association for
5870  *                     this query.
5871  *   spp_address     - This specifies which address is of interest.
5872  *   spp_hbinterval  - This contains the value of the heartbeat interval,
5873  *                     in milliseconds.  If a  value of zero
5874  *                     is present in this field then no changes are to
5875  *                     be made to this parameter.
5876  *   spp_pathmaxrxt  - This contains the maximum number of
5877  *                     retransmissions before this address shall be
5878  *                     considered unreachable. If a  value of zero
5879  *                     is present in this field then no changes are to
5880  *                     be made to this parameter.
5881  *   spp_pathmtu     - When Path MTU discovery is disabled the value
5882  *                     specified here will be the "fixed" path mtu.
5883  *                     Note that if the spp_address field is empty
5884  *                     then all associations on this address will
5885  *                     have this fixed path mtu set upon them.
5886  *
5887  *   spp_sackdelay   - When delayed sack is enabled, this value specifies
5888  *                     the number of milliseconds that sacks will be delayed
5889  *                     for. This value will apply to all addresses of an
5890  *                     association if the spp_address field is empty. Note
5891  *                     also, that if delayed sack is enabled and this
5892  *                     value is set to 0, no change is made to the last
5893  *                     recorded delayed sack timer value.
5894  *
5895  *   spp_flags       - These flags are used to control various features
5896  *                     on an association. The flag field may contain
5897  *                     zero or more of the following options.
5898  *
5899  *                     SPP_HB_ENABLE  - Enable heartbeats on the
5900  *                     specified address. Note that if the address
5901  *                     field is empty all addresses for the association
5902  *                     have heartbeats enabled upon them.
5903  *
5904  *                     SPP_HB_DISABLE - Disable heartbeats on the
5905  *                     speicifed address. Note that if the address
5906  *                     field is empty all addresses for the association
5907  *                     will have their heartbeats disabled. Note also
5908  *                     that SPP_HB_ENABLE and SPP_HB_DISABLE are
5909  *                     mutually exclusive, only one of these two should
5910  *                     be specified. Enabling both fields will have
5911  *                     undetermined results.
5912  *
5913  *                     SPP_HB_DEMAND - Request a user initiated heartbeat
5914  *                     to be made immediately.
5915  *
5916  *                     SPP_PMTUD_ENABLE - This field will enable PMTU
5917  *                     discovery upon the specified address. Note that
5918  *                     if the address feild is empty then all addresses
5919  *                     on the association are effected.
5920  *
5921  *                     SPP_PMTUD_DISABLE - This field will disable PMTU
5922  *                     discovery upon the specified address. Note that
5923  *                     if the address feild is empty then all addresses
5924  *                     on the association are effected. Not also that
5925  *                     SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5926  *                     exclusive. Enabling both will have undetermined
5927  *                     results.
5928  *
5929  *                     SPP_SACKDELAY_ENABLE - Setting this flag turns
5930  *                     on delayed sack. The time specified in spp_sackdelay
5931  *                     is used to specify the sack delay for this address. Note
5932  *                     that if spp_address is empty then all addresses will
5933  *                     enable delayed sack and take on the sack delay
5934  *                     value specified in spp_sackdelay.
5935  *                     SPP_SACKDELAY_DISABLE - Setting this flag turns
5936  *                     off delayed sack. If the spp_address field is blank then
5937  *                     delayed sack is disabled for the entire association. Note
5938  *                     also that this field is mutually exclusive to
5939  *                     SPP_SACKDELAY_ENABLE, setting both will have undefined
5940  *                     results.
5941  *
5942  *                     SPP_IPV6_FLOWLABEL:  Setting this flag enables the
5943  *                     setting of the IPV6 flow label value.  The value is
5944  *                     contained in the spp_ipv6_flowlabel field.
5945  *                     Upon retrieval, this flag will be set to indicate that
5946  *                     the spp_ipv6_flowlabel field has a valid value returned.
5947  *                     If a specific destination address is set (in the
5948  *                     spp_address field), then the value returned is that of
5949  *                     the address.  If just an association is specified (and
5950  *                     no address), then the association's default flow label
5951  *                     is returned.  If neither an association nor a destination
5952  *                     is specified, then the socket's default flow label is
5953  *                     returned.  For non-IPv6 sockets, this flag will be left
5954  *                     cleared.
5955  *
5956  *                     SPP_DSCP:  Setting this flag enables the setting of the
5957  *                     Differentiated Services Code Point (DSCP) value
5958  *                     associated with either the association or a specific
5959  *                     address.  The value is obtained in the spp_dscp field.
5960  *                     Upon retrieval, this flag will be set to indicate that
5961  *                     the spp_dscp field has a valid value returned.  If a
5962  *                     specific destination address is set when called (in the
5963  *                     spp_address field), then that specific destination
5964  *                     address's DSCP value is returned.  If just an association
5965  *                     is specified, then the association's default DSCP is
5966  *                     returned.  If neither an association nor a destination is
5967  *                     specified, then the socket's default DSCP is returned.
5968  *
5969  *   spp_ipv6_flowlabel
5970  *                   - This field is used in conjunction with the
5971  *                     SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
5972  *                     The 20 least significant bits are used for the flow
5973  *                     label.  This setting has precedence over any IPv6-layer
5974  *                     setting.
5975  *
5976  *   spp_dscp        - This field is used in conjunction with the SPP_DSCP flag
5977  *                     and contains the DSCP.  The 6 most significant bits are
5978  *                     used for the DSCP.  This setting has precedence over any
5979  *                     IPv4- or IPv6- layer setting.
5980  */
5981 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5982 					    char __user *optval, int __user *optlen)
5983 {
5984 	struct sctp_paddrparams  params;
5985 	struct sctp_transport   *trans = NULL;
5986 	struct sctp_association *asoc = NULL;
5987 	struct sctp_sock        *sp = sctp_sk(sk);
5988 
5989 	if (len >= sizeof(params))
5990 		len = sizeof(params);
5991 	else if (len >= ALIGN(offsetof(struct sctp_paddrparams,
5992 				       spp_ipv6_flowlabel), 4))
5993 		len = ALIGN(offsetof(struct sctp_paddrparams,
5994 				     spp_ipv6_flowlabel), 4);
5995 	else
5996 		return -EINVAL;
5997 
5998 	if (copy_from_user(&params, optval, len))
5999 		return -EFAULT;
6000 
6001 	/* If an address other than INADDR_ANY is specified, and
6002 	 * no transport is found, then the request is invalid.
6003 	 */
6004 	if (!sctp_is_any(sk, (union sctp_addr *)&params.spp_address)) {
6005 		trans = sctp_addr_id2transport(sk, &params.spp_address,
6006 					       params.spp_assoc_id);
6007 		if (!trans) {
6008 			pr_debug("%s: failed no transport\n", __func__);
6009 			return -EINVAL;
6010 		}
6011 	}
6012 
6013 	/* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
6014 	 * socket is a one to many style socket, and an association
6015 	 * was not found, then the id was invalid.
6016 	 */
6017 	asoc = sctp_id2assoc(sk, params.spp_assoc_id);
6018 	if (!asoc && params.spp_assoc_id != SCTP_FUTURE_ASSOC &&
6019 	    sctp_style(sk, UDP)) {
6020 		pr_debug("%s: failed no association\n", __func__);
6021 		return -EINVAL;
6022 	}
6023 
6024 	if (trans) {
6025 		/* Fetch transport values. */
6026 		params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
6027 		params.spp_pathmtu    = trans->pathmtu;
6028 		params.spp_pathmaxrxt = trans->pathmaxrxt;
6029 		params.spp_sackdelay  = jiffies_to_msecs(trans->sackdelay);
6030 
6031 		/*draft-11 doesn't say what to return in spp_flags*/
6032 		params.spp_flags      = trans->param_flags;
6033 		if (trans->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
6034 			params.spp_ipv6_flowlabel = trans->flowlabel &
6035 						    SCTP_FLOWLABEL_VAL_MASK;
6036 			params.spp_flags |= SPP_IPV6_FLOWLABEL;
6037 		}
6038 		if (trans->dscp & SCTP_DSCP_SET_MASK) {
6039 			params.spp_dscp	= trans->dscp & SCTP_DSCP_VAL_MASK;
6040 			params.spp_flags |= SPP_DSCP;
6041 		}
6042 	} else if (asoc) {
6043 		/* Fetch association values. */
6044 		params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
6045 		params.spp_pathmtu    = asoc->pathmtu;
6046 		params.spp_pathmaxrxt = asoc->pathmaxrxt;
6047 		params.spp_sackdelay  = jiffies_to_msecs(asoc->sackdelay);
6048 
6049 		/*draft-11 doesn't say what to return in spp_flags*/
6050 		params.spp_flags      = asoc->param_flags;
6051 		if (asoc->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
6052 			params.spp_ipv6_flowlabel = asoc->flowlabel &
6053 						    SCTP_FLOWLABEL_VAL_MASK;
6054 			params.spp_flags |= SPP_IPV6_FLOWLABEL;
6055 		}
6056 		if (asoc->dscp & SCTP_DSCP_SET_MASK) {
6057 			params.spp_dscp	= asoc->dscp & SCTP_DSCP_VAL_MASK;
6058 			params.spp_flags |= SPP_DSCP;
6059 		}
6060 	} else {
6061 		/* Fetch socket values. */
6062 		params.spp_hbinterval = sp->hbinterval;
6063 		params.spp_pathmtu    = sp->pathmtu;
6064 		params.spp_sackdelay  = sp->sackdelay;
6065 		params.spp_pathmaxrxt = sp->pathmaxrxt;
6066 
6067 		/*draft-11 doesn't say what to return in spp_flags*/
6068 		params.spp_flags      = sp->param_flags;
6069 		if (sp->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
6070 			params.spp_ipv6_flowlabel = sp->flowlabel &
6071 						    SCTP_FLOWLABEL_VAL_MASK;
6072 			params.spp_flags |= SPP_IPV6_FLOWLABEL;
6073 		}
6074 		if (sp->dscp & SCTP_DSCP_SET_MASK) {
6075 			params.spp_dscp	= sp->dscp & SCTP_DSCP_VAL_MASK;
6076 			params.spp_flags |= SPP_DSCP;
6077 		}
6078 	}
6079 
6080 	if (copy_to_user(optval, &params, len))
6081 		return -EFAULT;
6082 
6083 	if (put_user(len, optlen))
6084 		return -EFAULT;
6085 
6086 	return 0;
6087 }
6088 
6089 /*
6090  * 7.1.23.  Get or set delayed ack timer (SCTP_DELAYED_SACK)
6091  *
6092  * This option will effect the way delayed acks are performed.  This
6093  * option allows you to get or set the delayed ack time, in
6094  * milliseconds.  It also allows changing the delayed ack frequency.
6095  * Changing the frequency to 1 disables the delayed sack algorithm.  If
6096  * the assoc_id is 0, then this sets or gets the endpoints default
6097  * values.  If the assoc_id field is non-zero, then the set or get
6098  * effects the specified association for the one to many model (the
6099  * assoc_id field is ignored by the one to one model).  Note that if
6100  * sack_delay or sack_freq are 0 when setting this option, then the
6101  * current values will remain unchanged.
6102  *
6103  * struct sctp_sack_info {
6104  *     sctp_assoc_t            sack_assoc_id;
6105  *     uint32_t                sack_delay;
6106  *     uint32_t                sack_freq;
6107  * };
6108  *
6109  * sack_assoc_id -  This parameter, indicates which association the user
6110  *    is performing an action upon.  Note that if this field's value is
6111  *    zero then the endpoints default value is changed (effecting future
6112  *    associations only).
6113  *
6114  * sack_delay -  This parameter contains the number of milliseconds that
6115  *    the user is requesting the delayed ACK timer be set to.  Note that
6116  *    this value is defined in the standard to be between 200 and 500
6117  *    milliseconds.
6118  *
6119  * sack_freq -  This parameter contains the number of packets that must
6120  *    be received before a sack is sent without waiting for the delay
6121  *    timer to expire.  The default value for this is 2, setting this
6122  *    value to 1 will disable the delayed sack algorithm.
6123  */
6124 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
6125 					    char __user *optval,
6126 					    int __user *optlen)
6127 {
6128 	struct sctp_sack_info    params;
6129 	struct sctp_association *asoc = NULL;
6130 	struct sctp_sock        *sp = sctp_sk(sk);
6131 
6132 	if (len >= sizeof(struct sctp_sack_info)) {
6133 		len = sizeof(struct sctp_sack_info);
6134 
6135 		if (copy_from_user(&params, optval, len))
6136 			return -EFAULT;
6137 	} else if (len == sizeof(struct sctp_assoc_value)) {
6138 		pr_warn_ratelimited(DEPRECATED
6139 				    "%s (pid %d) "
6140 				    "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
6141 				    "Use struct sctp_sack_info instead\n",
6142 				    current->comm, task_pid_nr(current));
6143 		if (copy_from_user(&params, optval, len))
6144 			return -EFAULT;
6145 	} else
6146 		return -EINVAL;
6147 
6148 	/* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
6149 	 * socket is a one to many style socket, and an association
6150 	 * was not found, then the id was invalid.
6151 	 */
6152 	asoc = sctp_id2assoc(sk, params.sack_assoc_id);
6153 	if (!asoc && params.sack_assoc_id != SCTP_FUTURE_ASSOC &&
6154 	    sctp_style(sk, UDP))
6155 		return -EINVAL;
6156 
6157 	if (asoc) {
6158 		/* Fetch association values. */
6159 		if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
6160 			params.sack_delay = jiffies_to_msecs(asoc->sackdelay);
6161 			params.sack_freq = asoc->sackfreq;
6162 
6163 		} else {
6164 			params.sack_delay = 0;
6165 			params.sack_freq = 1;
6166 		}
6167 	} else {
6168 		/* Fetch socket values. */
6169 		if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
6170 			params.sack_delay  = sp->sackdelay;
6171 			params.sack_freq = sp->sackfreq;
6172 		} else {
6173 			params.sack_delay  = 0;
6174 			params.sack_freq = 1;
6175 		}
6176 	}
6177 
6178 	if (copy_to_user(optval, &params, len))
6179 		return -EFAULT;
6180 
6181 	if (put_user(len, optlen))
6182 		return -EFAULT;
6183 
6184 	return 0;
6185 }
6186 
6187 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
6188  *
6189  * Applications can specify protocol parameters for the default association
6190  * initialization.  The option name argument to setsockopt() and getsockopt()
6191  * is SCTP_INITMSG.
6192  *
6193  * Setting initialization parameters is effective only on an unconnected
6194  * socket (for UDP-style sockets only future associations are effected
6195  * by the change).  With TCP-style sockets, this option is inherited by
6196  * sockets derived from a listener socket.
6197  */
6198 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
6199 {
6200 	if (len < sizeof(struct sctp_initmsg))
6201 		return -EINVAL;
6202 	len = sizeof(struct sctp_initmsg);
6203 	if (put_user(len, optlen))
6204 		return -EFAULT;
6205 	if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
6206 		return -EFAULT;
6207 	return 0;
6208 }
6209 
6210 
6211 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
6212 				      char __user *optval, int __user *optlen)
6213 {
6214 	struct sctp_association *asoc;
6215 	int cnt = 0;
6216 	struct sctp_getaddrs getaddrs;
6217 	struct sctp_transport *from;
6218 	void __user *to;
6219 	union sctp_addr temp;
6220 	struct sctp_sock *sp = sctp_sk(sk);
6221 	int addrlen;
6222 	size_t space_left;
6223 	int bytes_copied;
6224 
6225 	if (len < sizeof(struct sctp_getaddrs))
6226 		return -EINVAL;
6227 
6228 	if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6229 		return -EFAULT;
6230 
6231 	/* For UDP-style sockets, id specifies the association to query.  */
6232 	asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6233 	if (!asoc)
6234 		return -EINVAL;
6235 
6236 	to = optval + offsetof(struct sctp_getaddrs, addrs);
6237 	space_left = len - offsetof(struct sctp_getaddrs, addrs);
6238 
6239 	list_for_each_entry(from, &asoc->peer.transport_addr_list,
6240 				transports) {
6241 		memcpy(&temp, &from->ipaddr, sizeof(temp));
6242 		addrlen = sctp_get_pf_specific(sk->sk_family)
6243 			      ->addr_to_user(sp, &temp);
6244 		if (space_left < addrlen)
6245 			return -ENOMEM;
6246 		if (copy_to_user(to, &temp, addrlen))
6247 			return -EFAULT;
6248 		to += addrlen;
6249 		cnt++;
6250 		space_left -= addrlen;
6251 	}
6252 
6253 	if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
6254 		return -EFAULT;
6255 	bytes_copied = ((char __user *)to) - optval;
6256 	if (put_user(bytes_copied, optlen))
6257 		return -EFAULT;
6258 
6259 	return 0;
6260 }
6261 
6262 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
6263 			    size_t space_left, int *bytes_copied)
6264 {
6265 	struct sctp_sockaddr_entry *addr;
6266 	union sctp_addr temp;
6267 	int cnt = 0;
6268 	int addrlen;
6269 	struct net *net = sock_net(sk);
6270 
6271 	rcu_read_lock();
6272 	list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
6273 		if (!addr->valid)
6274 			continue;
6275 
6276 		if ((PF_INET == sk->sk_family) &&
6277 		    (AF_INET6 == addr->a.sa.sa_family))
6278 			continue;
6279 		if ((PF_INET6 == sk->sk_family) &&
6280 		    inet_v6_ipv6only(sk) &&
6281 		    (AF_INET == addr->a.sa.sa_family))
6282 			continue;
6283 		memcpy(&temp, &addr->a, sizeof(temp));
6284 		if (!temp.v4.sin_port)
6285 			temp.v4.sin_port = htons(port);
6286 
6287 		addrlen = sctp_get_pf_specific(sk->sk_family)
6288 			      ->addr_to_user(sctp_sk(sk), &temp);
6289 
6290 		if (space_left < addrlen) {
6291 			cnt =  -ENOMEM;
6292 			break;
6293 		}
6294 		memcpy(to, &temp, addrlen);
6295 
6296 		to += addrlen;
6297 		cnt++;
6298 		space_left -= addrlen;
6299 		*bytes_copied += addrlen;
6300 	}
6301 	rcu_read_unlock();
6302 
6303 	return cnt;
6304 }
6305 
6306 
6307 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
6308 				       char __user *optval, int __user *optlen)
6309 {
6310 	struct sctp_bind_addr *bp;
6311 	struct sctp_association *asoc;
6312 	int cnt = 0;
6313 	struct sctp_getaddrs getaddrs;
6314 	struct sctp_sockaddr_entry *addr;
6315 	void __user *to;
6316 	union sctp_addr temp;
6317 	struct sctp_sock *sp = sctp_sk(sk);
6318 	int addrlen;
6319 	int err = 0;
6320 	size_t space_left;
6321 	int bytes_copied = 0;
6322 	void *addrs;
6323 	void *buf;
6324 
6325 	if (len < sizeof(struct sctp_getaddrs))
6326 		return -EINVAL;
6327 
6328 	if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6329 		return -EFAULT;
6330 
6331 	/*
6332 	 *  For UDP-style sockets, id specifies the association to query.
6333 	 *  If the id field is set to the value '0' then the locally bound
6334 	 *  addresses are returned without regard to any particular
6335 	 *  association.
6336 	 */
6337 	if (0 == getaddrs.assoc_id) {
6338 		bp = &sctp_sk(sk)->ep->base.bind_addr;
6339 	} else {
6340 		asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6341 		if (!asoc)
6342 			return -EINVAL;
6343 		bp = &asoc->base.bind_addr;
6344 	}
6345 
6346 	to = optval + offsetof(struct sctp_getaddrs, addrs);
6347 	space_left = len - offsetof(struct sctp_getaddrs, addrs);
6348 
6349 	addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
6350 	if (!addrs)
6351 		return -ENOMEM;
6352 
6353 	/* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
6354 	 * addresses from the global local address list.
6355 	 */
6356 	if (sctp_list_single_entry(&bp->address_list)) {
6357 		addr = list_entry(bp->address_list.next,
6358 				  struct sctp_sockaddr_entry, list);
6359 		if (sctp_is_any(sk, &addr->a)) {
6360 			cnt = sctp_copy_laddrs(sk, bp->port, addrs,
6361 						space_left, &bytes_copied);
6362 			if (cnt < 0) {
6363 				err = cnt;
6364 				goto out;
6365 			}
6366 			goto copy_getaddrs;
6367 		}
6368 	}
6369 
6370 	buf = addrs;
6371 	/* Protection on the bound address list is not needed since
6372 	 * in the socket option context we hold a socket lock and
6373 	 * thus the bound address list can't change.
6374 	 */
6375 	list_for_each_entry(addr, &bp->address_list, list) {
6376 		memcpy(&temp, &addr->a, sizeof(temp));
6377 		addrlen = sctp_get_pf_specific(sk->sk_family)
6378 			      ->addr_to_user(sp, &temp);
6379 		if (space_left < addrlen) {
6380 			err =  -ENOMEM; /*fixme: right error?*/
6381 			goto out;
6382 		}
6383 		memcpy(buf, &temp, addrlen);
6384 		buf += addrlen;
6385 		bytes_copied += addrlen;
6386 		cnt++;
6387 		space_left -= addrlen;
6388 	}
6389 
6390 copy_getaddrs:
6391 	if (copy_to_user(to, addrs, bytes_copied)) {
6392 		err = -EFAULT;
6393 		goto out;
6394 	}
6395 	if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
6396 		err = -EFAULT;
6397 		goto out;
6398 	}
6399 	/* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
6400 	 * but we can't change it anymore.
6401 	 */
6402 	if (put_user(bytes_copied, optlen))
6403 		err = -EFAULT;
6404 out:
6405 	kfree(addrs);
6406 	return err;
6407 }
6408 
6409 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
6410  *
6411  * Requests that the local SCTP stack use the enclosed peer address as
6412  * the association primary.  The enclosed address must be one of the
6413  * association peer's addresses.
6414  */
6415 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
6416 					char __user *optval, int __user *optlen)
6417 {
6418 	struct sctp_prim prim;
6419 	struct sctp_association *asoc;
6420 	struct sctp_sock *sp = sctp_sk(sk);
6421 
6422 	if (len < sizeof(struct sctp_prim))
6423 		return -EINVAL;
6424 
6425 	len = sizeof(struct sctp_prim);
6426 
6427 	if (copy_from_user(&prim, optval, len))
6428 		return -EFAULT;
6429 
6430 	asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
6431 	if (!asoc)
6432 		return -EINVAL;
6433 
6434 	if (!asoc->peer.primary_path)
6435 		return -ENOTCONN;
6436 
6437 	memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
6438 		asoc->peer.primary_path->af_specific->sockaddr_len);
6439 
6440 	sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
6441 			(union sctp_addr *)&prim.ssp_addr);
6442 
6443 	if (put_user(len, optlen))
6444 		return -EFAULT;
6445 	if (copy_to_user(optval, &prim, len))
6446 		return -EFAULT;
6447 
6448 	return 0;
6449 }
6450 
6451 /*
6452  * 7.1.11  Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
6453  *
6454  * Requests that the local endpoint set the specified Adaptation Layer
6455  * Indication parameter for all future INIT and INIT-ACK exchanges.
6456  */
6457 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
6458 				  char __user *optval, int __user *optlen)
6459 {
6460 	struct sctp_setadaptation adaptation;
6461 
6462 	if (len < sizeof(struct sctp_setadaptation))
6463 		return -EINVAL;
6464 
6465 	len = sizeof(struct sctp_setadaptation);
6466 
6467 	adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
6468 
6469 	if (put_user(len, optlen))
6470 		return -EFAULT;
6471 	if (copy_to_user(optval, &adaptation, len))
6472 		return -EFAULT;
6473 
6474 	return 0;
6475 }
6476 
6477 /*
6478  *
6479  * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
6480  *
6481  *   Applications that wish to use the sendto() system call may wish to
6482  *   specify a default set of parameters that would normally be supplied
6483  *   through the inclusion of ancillary data.  This socket option allows
6484  *   such an application to set the default sctp_sndrcvinfo structure.
6485 
6486 
6487  *   The application that wishes to use this socket option simply passes
6488  *   in to this call the sctp_sndrcvinfo structure defined in Section
6489  *   5.2.2) The input parameters accepted by this call include
6490  *   sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
6491  *   sinfo_timetolive.  The user must provide the sinfo_assoc_id field in
6492  *   to this call if the caller is using the UDP model.
6493  *
6494  *   For getsockopt, it get the default sctp_sndrcvinfo structure.
6495  */
6496 static int sctp_getsockopt_default_send_param(struct sock *sk,
6497 					int len, char __user *optval,
6498 					int __user *optlen)
6499 {
6500 	struct sctp_sock *sp = sctp_sk(sk);
6501 	struct sctp_association *asoc;
6502 	struct sctp_sndrcvinfo info;
6503 
6504 	if (len < sizeof(info))
6505 		return -EINVAL;
6506 
6507 	len = sizeof(info);
6508 
6509 	if (copy_from_user(&info, optval, len))
6510 		return -EFAULT;
6511 
6512 	asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
6513 	if (!asoc && info.sinfo_assoc_id != SCTP_FUTURE_ASSOC &&
6514 	    sctp_style(sk, UDP))
6515 		return -EINVAL;
6516 
6517 	if (asoc) {
6518 		info.sinfo_stream = asoc->default_stream;
6519 		info.sinfo_flags = asoc->default_flags;
6520 		info.sinfo_ppid = asoc->default_ppid;
6521 		info.sinfo_context = asoc->default_context;
6522 		info.sinfo_timetolive = asoc->default_timetolive;
6523 	} else {
6524 		info.sinfo_stream = sp->default_stream;
6525 		info.sinfo_flags = sp->default_flags;
6526 		info.sinfo_ppid = sp->default_ppid;
6527 		info.sinfo_context = sp->default_context;
6528 		info.sinfo_timetolive = sp->default_timetolive;
6529 	}
6530 
6531 	if (put_user(len, optlen))
6532 		return -EFAULT;
6533 	if (copy_to_user(optval, &info, len))
6534 		return -EFAULT;
6535 
6536 	return 0;
6537 }
6538 
6539 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
6540  * (SCTP_DEFAULT_SNDINFO)
6541  */
6542 static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
6543 					   char __user *optval,
6544 					   int __user *optlen)
6545 {
6546 	struct sctp_sock *sp = sctp_sk(sk);
6547 	struct sctp_association *asoc;
6548 	struct sctp_sndinfo info;
6549 
6550 	if (len < sizeof(info))
6551 		return -EINVAL;
6552 
6553 	len = sizeof(info);
6554 
6555 	if (copy_from_user(&info, optval, len))
6556 		return -EFAULT;
6557 
6558 	asoc = sctp_id2assoc(sk, info.snd_assoc_id);
6559 	if (!asoc && info.snd_assoc_id != SCTP_FUTURE_ASSOC &&
6560 	    sctp_style(sk, UDP))
6561 		return -EINVAL;
6562 
6563 	if (asoc) {
6564 		info.snd_sid = asoc->default_stream;
6565 		info.snd_flags = asoc->default_flags;
6566 		info.snd_ppid = asoc->default_ppid;
6567 		info.snd_context = asoc->default_context;
6568 	} else {
6569 		info.snd_sid = sp->default_stream;
6570 		info.snd_flags = sp->default_flags;
6571 		info.snd_ppid = sp->default_ppid;
6572 		info.snd_context = sp->default_context;
6573 	}
6574 
6575 	if (put_user(len, optlen))
6576 		return -EFAULT;
6577 	if (copy_to_user(optval, &info, len))
6578 		return -EFAULT;
6579 
6580 	return 0;
6581 }
6582 
6583 /*
6584  *
6585  * 7.1.5 SCTP_NODELAY
6586  *
6587  * Turn on/off any Nagle-like algorithm.  This means that packets are
6588  * generally sent as soon as possible and no unnecessary delays are
6589  * introduced, at the cost of more packets in the network.  Expects an
6590  * integer boolean flag.
6591  */
6592 
6593 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
6594 				   char __user *optval, int __user *optlen)
6595 {
6596 	int val;
6597 
6598 	if (len < sizeof(int))
6599 		return -EINVAL;
6600 
6601 	len = sizeof(int);
6602 	val = (sctp_sk(sk)->nodelay == 1);
6603 	if (put_user(len, optlen))
6604 		return -EFAULT;
6605 	if (copy_to_user(optval, &val, len))
6606 		return -EFAULT;
6607 	return 0;
6608 }
6609 
6610 /*
6611  *
6612  * 7.1.1 SCTP_RTOINFO
6613  *
6614  * The protocol parameters used to initialize and bound retransmission
6615  * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
6616  * and modify these parameters.
6617  * All parameters are time values, in milliseconds.  A value of 0, when
6618  * modifying the parameters, indicates that the current value should not
6619  * be changed.
6620  *
6621  */
6622 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
6623 				char __user *optval,
6624 				int __user *optlen) {
6625 	struct sctp_rtoinfo rtoinfo;
6626 	struct sctp_association *asoc;
6627 
6628 	if (len < sizeof (struct sctp_rtoinfo))
6629 		return -EINVAL;
6630 
6631 	len = sizeof(struct sctp_rtoinfo);
6632 
6633 	if (copy_from_user(&rtoinfo, optval, len))
6634 		return -EFAULT;
6635 
6636 	asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
6637 
6638 	if (!asoc && rtoinfo.srto_assoc_id != SCTP_FUTURE_ASSOC &&
6639 	    sctp_style(sk, UDP))
6640 		return -EINVAL;
6641 
6642 	/* Values corresponding to the specific association. */
6643 	if (asoc) {
6644 		rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
6645 		rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
6646 		rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
6647 	} else {
6648 		/* Values corresponding to the endpoint. */
6649 		struct sctp_sock *sp = sctp_sk(sk);
6650 
6651 		rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
6652 		rtoinfo.srto_max = sp->rtoinfo.srto_max;
6653 		rtoinfo.srto_min = sp->rtoinfo.srto_min;
6654 	}
6655 
6656 	if (put_user(len, optlen))
6657 		return -EFAULT;
6658 
6659 	if (copy_to_user(optval, &rtoinfo, len))
6660 		return -EFAULT;
6661 
6662 	return 0;
6663 }
6664 
6665 /*
6666  *
6667  * 7.1.2 SCTP_ASSOCINFO
6668  *
6669  * This option is used to tune the maximum retransmission attempts
6670  * of the association.
6671  * Returns an error if the new association retransmission value is
6672  * greater than the sum of the retransmission value  of the peer.
6673  * See [SCTP] for more information.
6674  *
6675  */
6676 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
6677 				     char __user *optval,
6678 				     int __user *optlen)
6679 {
6680 
6681 	struct sctp_assocparams assocparams;
6682 	struct sctp_association *asoc;
6683 	struct list_head *pos;
6684 	int cnt = 0;
6685 
6686 	if (len < sizeof (struct sctp_assocparams))
6687 		return -EINVAL;
6688 
6689 	len = sizeof(struct sctp_assocparams);
6690 
6691 	if (copy_from_user(&assocparams, optval, len))
6692 		return -EFAULT;
6693 
6694 	asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
6695 
6696 	if (!asoc && assocparams.sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
6697 	    sctp_style(sk, UDP))
6698 		return -EINVAL;
6699 
6700 	/* Values correspoinding to the specific association */
6701 	if (asoc) {
6702 		assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
6703 		assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
6704 		assocparams.sasoc_local_rwnd = asoc->a_rwnd;
6705 		assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
6706 
6707 		list_for_each(pos, &asoc->peer.transport_addr_list) {
6708 			cnt++;
6709 		}
6710 
6711 		assocparams.sasoc_number_peer_destinations = cnt;
6712 	} else {
6713 		/* Values corresponding to the endpoint */
6714 		struct sctp_sock *sp = sctp_sk(sk);
6715 
6716 		assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
6717 		assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
6718 		assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
6719 		assocparams.sasoc_cookie_life =
6720 					sp->assocparams.sasoc_cookie_life;
6721 		assocparams.sasoc_number_peer_destinations =
6722 					sp->assocparams.
6723 					sasoc_number_peer_destinations;
6724 	}
6725 
6726 	if (put_user(len, optlen))
6727 		return -EFAULT;
6728 
6729 	if (copy_to_user(optval, &assocparams, len))
6730 		return -EFAULT;
6731 
6732 	return 0;
6733 }
6734 
6735 /*
6736  * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
6737  *
6738  * This socket option is a boolean flag which turns on or off mapped V4
6739  * addresses.  If this option is turned on and the socket is type
6740  * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
6741  * If this option is turned off, then no mapping will be done of V4
6742  * addresses and a user will receive both PF_INET6 and PF_INET type
6743  * addresses on the socket.
6744  */
6745 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
6746 				    char __user *optval, int __user *optlen)
6747 {
6748 	int val;
6749 	struct sctp_sock *sp = sctp_sk(sk);
6750 
6751 	if (len < sizeof(int))
6752 		return -EINVAL;
6753 
6754 	len = sizeof(int);
6755 	val = sp->v4mapped;
6756 	if (put_user(len, optlen))
6757 		return -EFAULT;
6758 	if (copy_to_user(optval, &val, len))
6759 		return -EFAULT;
6760 
6761 	return 0;
6762 }
6763 
6764 /*
6765  * 7.1.29.  Set or Get the default context (SCTP_CONTEXT)
6766  * (chapter and verse is quoted at sctp_setsockopt_context())
6767  */
6768 static int sctp_getsockopt_context(struct sock *sk, int len,
6769 				   char __user *optval, int __user *optlen)
6770 {
6771 	struct sctp_assoc_value params;
6772 	struct sctp_association *asoc;
6773 
6774 	if (len < sizeof(struct sctp_assoc_value))
6775 		return -EINVAL;
6776 
6777 	len = sizeof(struct sctp_assoc_value);
6778 
6779 	if (copy_from_user(&params, optval, len))
6780 		return -EFAULT;
6781 
6782 	asoc = sctp_id2assoc(sk, params.assoc_id);
6783 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6784 	    sctp_style(sk, UDP))
6785 		return -EINVAL;
6786 
6787 	params.assoc_value = asoc ? asoc->default_rcv_context
6788 				  : sctp_sk(sk)->default_rcv_context;
6789 
6790 	if (put_user(len, optlen))
6791 		return -EFAULT;
6792 	if (copy_to_user(optval, &params, len))
6793 		return -EFAULT;
6794 
6795 	return 0;
6796 }
6797 
6798 /*
6799  * 8.1.16.  Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
6800  * This option will get or set the maximum size to put in any outgoing
6801  * SCTP DATA chunk.  If a message is larger than this size it will be
6802  * fragmented by SCTP into the specified size.  Note that the underlying
6803  * SCTP implementation may fragment into smaller sized chunks when the
6804  * PMTU of the underlying association is smaller than the value set by
6805  * the user.  The default value for this option is '0' which indicates
6806  * the user is NOT limiting fragmentation and only the PMTU will effect
6807  * SCTP's choice of DATA chunk size.  Note also that values set larger
6808  * than the maximum size of an IP datagram will effectively let SCTP
6809  * control fragmentation (i.e. the same as setting this option to 0).
6810  *
6811  * The following structure is used to access and modify this parameter:
6812  *
6813  * struct sctp_assoc_value {
6814  *   sctp_assoc_t assoc_id;
6815  *   uint32_t assoc_value;
6816  * };
6817  *
6818  * assoc_id:  This parameter is ignored for one-to-one style sockets.
6819  *    For one-to-many style sockets this parameter indicates which
6820  *    association the user is performing an action upon.  Note that if
6821  *    this field's value is zero then the endpoints default value is
6822  *    changed (effecting future associations only).
6823  * assoc_value:  This parameter specifies the maximum size in bytes.
6824  */
6825 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
6826 				  char __user *optval, int __user *optlen)
6827 {
6828 	struct sctp_assoc_value params;
6829 	struct sctp_association *asoc;
6830 
6831 	if (len == sizeof(int)) {
6832 		pr_warn_ratelimited(DEPRECATED
6833 				    "%s (pid %d) "
6834 				    "Use of int in maxseg socket option.\n"
6835 				    "Use struct sctp_assoc_value instead\n",
6836 				    current->comm, task_pid_nr(current));
6837 		params.assoc_id = SCTP_FUTURE_ASSOC;
6838 	} else if (len >= sizeof(struct sctp_assoc_value)) {
6839 		len = sizeof(struct sctp_assoc_value);
6840 		if (copy_from_user(&params, optval, len))
6841 			return -EFAULT;
6842 	} else
6843 		return -EINVAL;
6844 
6845 	asoc = sctp_id2assoc(sk, params.assoc_id);
6846 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6847 	    sctp_style(sk, UDP))
6848 		return -EINVAL;
6849 
6850 	if (asoc)
6851 		params.assoc_value = asoc->frag_point;
6852 	else
6853 		params.assoc_value = sctp_sk(sk)->user_frag;
6854 
6855 	if (put_user(len, optlen))
6856 		return -EFAULT;
6857 	if (len == sizeof(int)) {
6858 		if (copy_to_user(optval, &params.assoc_value, len))
6859 			return -EFAULT;
6860 	} else {
6861 		if (copy_to_user(optval, &params, len))
6862 			return -EFAULT;
6863 	}
6864 
6865 	return 0;
6866 }
6867 
6868 /*
6869  * 7.1.24.  Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
6870  * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
6871  */
6872 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
6873 					       char __user *optval, int __user *optlen)
6874 {
6875 	int val;
6876 
6877 	if (len < sizeof(int))
6878 		return -EINVAL;
6879 
6880 	len = sizeof(int);
6881 
6882 	val = sctp_sk(sk)->frag_interleave;
6883 	if (put_user(len, optlen))
6884 		return -EFAULT;
6885 	if (copy_to_user(optval, &val, len))
6886 		return -EFAULT;
6887 
6888 	return 0;
6889 }
6890 
6891 /*
6892  * 7.1.25.  Set or Get the sctp partial delivery point
6893  * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
6894  */
6895 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
6896 						  char __user *optval,
6897 						  int __user *optlen)
6898 {
6899 	u32 val;
6900 
6901 	if (len < sizeof(u32))
6902 		return -EINVAL;
6903 
6904 	len = sizeof(u32);
6905 
6906 	val = sctp_sk(sk)->pd_point;
6907 	if (put_user(len, optlen))
6908 		return -EFAULT;
6909 	if (copy_to_user(optval, &val, len))
6910 		return -EFAULT;
6911 
6912 	return 0;
6913 }
6914 
6915 /*
6916  * 7.1.28.  Set or Get the maximum burst (SCTP_MAX_BURST)
6917  * (chapter and verse is quoted at sctp_setsockopt_maxburst())
6918  */
6919 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
6920 				    char __user *optval,
6921 				    int __user *optlen)
6922 {
6923 	struct sctp_assoc_value params;
6924 	struct sctp_association *asoc;
6925 
6926 	if (len == sizeof(int)) {
6927 		pr_warn_ratelimited(DEPRECATED
6928 				    "%s (pid %d) "
6929 				    "Use of int in max_burst socket option.\n"
6930 				    "Use struct sctp_assoc_value instead\n",
6931 				    current->comm, task_pid_nr(current));
6932 		params.assoc_id = SCTP_FUTURE_ASSOC;
6933 	} else if (len >= sizeof(struct sctp_assoc_value)) {
6934 		len = sizeof(struct sctp_assoc_value);
6935 		if (copy_from_user(&params, optval, len))
6936 			return -EFAULT;
6937 	} else
6938 		return -EINVAL;
6939 
6940 	asoc = sctp_id2assoc(sk, params.assoc_id);
6941 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6942 	    sctp_style(sk, UDP))
6943 		return -EINVAL;
6944 
6945 	params.assoc_value = asoc ? asoc->max_burst : sctp_sk(sk)->max_burst;
6946 
6947 	if (len == sizeof(int)) {
6948 		if (copy_to_user(optval, &params.assoc_value, len))
6949 			return -EFAULT;
6950 	} else {
6951 		if (copy_to_user(optval, &params, len))
6952 			return -EFAULT;
6953 	}
6954 
6955 	return 0;
6956 
6957 }
6958 
6959 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
6960 				    char __user *optval, int __user *optlen)
6961 {
6962 	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6963 	struct sctp_hmacalgo  __user *p = (void __user *)optval;
6964 	struct sctp_hmac_algo_param *hmacs;
6965 	__u16 data_len = 0;
6966 	u32 num_idents;
6967 	int i;
6968 
6969 	if (!ep->auth_enable)
6970 		return -EACCES;
6971 
6972 	hmacs = ep->auth_hmacs_list;
6973 	data_len = ntohs(hmacs->param_hdr.length) -
6974 		   sizeof(struct sctp_paramhdr);
6975 
6976 	if (len < sizeof(struct sctp_hmacalgo) + data_len)
6977 		return -EINVAL;
6978 
6979 	len = sizeof(struct sctp_hmacalgo) + data_len;
6980 	num_idents = data_len / sizeof(u16);
6981 
6982 	if (put_user(len, optlen))
6983 		return -EFAULT;
6984 	if (put_user(num_idents, &p->shmac_num_idents))
6985 		return -EFAULT;
6986 	for (i = 0; i < num_idents; i++) {
6987 		__u16 hmacid = ntohs(hmacs->hmac_ids[i]);
6988 
6989 		if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
6990 			return -EFAULT;
6991 	}
6992 	return 0;
6993 }
6994 
6995 static int sctp_getsockopt_active_key(struct sock *sk, int len,
6996 				    char __user *optval, int __user *optlen)
6997 {
6998 	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6999 	struct sctp_authkeyid val;
7000 	struct sctp_association *asoc;
7001 
7002 	if (len < sizeof(struct sctp_authkeyid))
7003 		return -EINVAL;
7004 
7005 	len = sizeof(struct sctp_authkeyid);
7006 	if (copy_from_user(&val, optval, len))
7007 		return -EFAULT;
7008 
7009 	asoc = sctp_id2assoc(sk, val.scact_assoc_id);
7010 	if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
7011 		return -EINVAL;
7012 
7013 	if (asoc) {
7014 		if (!asoc->peer.auth_capable)
7015 			return -EACCES;
7016 		val.scact_keynumber = asoc->active_key_id;
7017 	} else {
7018 		if (!ep->auth_enable)
7019 			return -EACCES;
7020 		val.scact_keynumber = ep->active_key_id;
7021 	}
7022 
7023 	if (put_user(len, optlen))
7024 		return -EFAULT;
7025 	if (copy_to_user(optval, &val, len))
7026 		return -EFAULT;
7027 
7028 	return 0;
7029 }
7030 
7031 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
7032 				    char __user *optval, int __user *optlen)
7033 {
7034 	struct sctp_authchunks __user *p = (void __user *)optval;
7035 	struct sctp_authchunks val;
7036 	struct sctp_association *asoc;
7037 	struct sctp_chunks_param *ch;
7038 	u32    num_chunks = 0;
7039 	char __user *to;
7040 
7041 	if (len < sizeof(struct sctp_authchunks))
7042 		return -EINVAL;
7043 
7044 	if (copy_from_user(&val, optval, sizeof(val)))
7045 		return -EFAULT;
7046 
7047 	to = p->gauth_chunks;
7048 	asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
7049 	if (!asoc)
7050 		return -EINVAL;
7051 
7052 	if (!asoc->peer.auth_capable)
7053 		return -EACCES;
7054 
7055 	ch = asoc->peer.peer_chunks;
7056 	if (!ch)
7057 		goto num;
7058 
7059 	/* See if the user provided enough room for all the data */
7060 	num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
7061 	if (len < num_chunks)
7062 		return -EINVAL;
7063 
7064 	if (copy_to_user(to, ch->chunks, num_chunks))
7065 		return -EFAULT;
7066 num:
7067 	len = sizeof(struct sctp_authchunks) + num_chunks;
7068 	if (put_user(len, optlen))
7069 		return -EFAULT;
7070 	if (put_user(num_chunks, &p->gauth_number_of_chunks))
7071 		return -EFAULT;
7072 	return 0;
7073 }
7074 
7075 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
7076 				    char __user *optval, int __user *optlen)
7077 {
7078 	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
7079 	struct sctp_authchunks __user *p = (void __user *)optval;
7080 	struct sctp_authchunks val;
7081 	struct sctp_association *asoc;
7082 	struct sctp_chunks_param *ch;
7083 	u32    num_chunks = 0;
7084 	char __user *to;
7085 
7086 	if (len < sizeof(struct sctp_authchunks))
7087 		return -EINVAL;
7088 
7089 	if (copy_from_user(&val, optval, sizeof(val)))
7090 		return -EFAULT;
7091 
7092 	to = p->gauth_chunks;
7093 	asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
7094 	if (!asoc && val.gauth_assoc_id != SCTP_FUTURE_ASSOC &&
7095 	    sctp_style(sk, UDP))
7096 		return -EINVAL;
7097 
7098 	if (asoc) {
7099 		if (!asoc->peer.auth_capable)
7100 			return -EACCES;
7101 		ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
7102 	} else {
7103 		if (!ep->auth_enable)
7104 			return -EACCES;
7105 		ch = ep->auth_chunk_list;
7106 	}
7107 	if (!ch)
7108 		goto num;
7109 
7110 	num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
7111 	if (len < sizeof(struct sctp_authchunks) + num_chunks)
7112 		return -EINVAL;
7113 
7114 	if (copy_to_user(to, ch->chunks, num_chunks))
7115 		return -EFAULT;
7116 num:
7117 	len = sizeof(struct sctp_authchunks) + num_chunks;
7118 	if (put_user(len, optlen))
7119 		return -EFAULT;
7120 	if (put_user(num_chunks, &p->gauth_number_of_chunks))
7121 		return -EFAULT;
7122 
7123 	return 0;
7124 }
7125 
7126 /*
7127  * 8.2.5.  Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
7128  * This option gets the current number of associations that are attached
7129  * to a one-to-many style socket.  The option value is an uint32_t.
7130  */
7131 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
7132 				    char __user *optval, int __user *optlen)
7133 {
7134 	struct sctp_sock *sp = sctp_sk(sk);
7135 	struct sctp_association *asoc;
7136 	u32 val = 0;
7137 
7138 	if (sctp_style(sk, TCP))
7139 		return -EOPNOTSUPP;
7140 
7141 	if (len < sizeof(u32))
7142 		return -EINVAL;
7143 
7144 	len = sizeof(u32);
7145 
7146 	list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7147 		val++;
7148 	}
7149 
7150 	if (put_user(len, optlen))
7151 		return -EFAULT;
7152 	if (copy_to_user(optval, &val, len))
7153 		return -EFAULT;
7154 
7155 	return 0;
7156 }
7157 
7158 /*
7159  * 8.1.23 SCTP_AUTO_ASCONF
7160  * See the corresponding setsockopt entry as description
7161  */
7162 static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
7163 				   char __user *optval, int __user *optlen)
7164 {
7165 	int val = 0;
7166 
7167 	if (len < sizeof(int))
7168 		return -EINVAL;
7169 
7170 	len = sizeof(int);
7171 	if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
7172 		val = 1;
7173 	if (put_user(len, optlen))
7174 		return -EFAULT;
7175 	if (copy_to_user(optval, &val, len))
7176 		return -EFAULT;
7177 	return 0;
7178 }
7179 
7180 /*
7181  * 8.2.6. Get the Current Identifiers of Associations
7182  *        (SCTP_GET_ASSOC_ID_LIST)
7183  *
7184  * This option gets the current list of SCTP association identifiers of
7185  * the SCTP associations handled by a one-to-many style socket.
7186  */
7187 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
7188 				    char __user *optval, int __user *optlen)
7189 {
7190 	struct sctp_sock *sp = sctp_sk(sk);
7191 	struct sctp_association *asoc;
7192 	struct sctp_assoc_ids *ids;
7193 	u32 num = 0;
7194 
7195 	if (sctp_style(sk, TCP))
7196 		return -EOPNOTSUPP;
7197 
7198 	if (len < sizeof(struct sctp_assoc_ids))
7199 		return -EINVAL;
7200 
7201 	list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7202 		num++;
7203 	}
7204 
7205 	if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
7206 		return -EINVAL;
7207 
7208 	len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
7209 
7210 	ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
7211 	if (unlikely(!ids))
7212 		return -ENOMEM;
7213 
7214 	ids->gaids_number_of_ids = num;
7215 	num = 0;
7216 	list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7217 		ids->gaids_assoc_id[num++] = asoc->assoc_id;
7218 	}
7219 
7220 	if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
7221 		kfree(ids);
7222 		return -EFAULT;
7223 	}
7224 
7225 	kfree(ids);
7226 	return 0;
7227 }
7228 
7229 /*
7230  * SCTP_PEER_ADDR_THLDS
7231  *
7232  * This option allows us to fetch the partially failed threshold for one or all
7233  * transports in an association.  See Section 6.1 of:
7234  * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
7235  */
7236 static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
7237 					    char __user *optval, int len,
7238 					    int __user *optlen, bool v2)
7239 {
7240 	struct sctp_paddrthlds_v2 val;
7241 	struct sctp_transport *trans;
7242 	struct sctp_association *asoc;
7243 	int min;
7244 
7245 	min = v2 ? sizeof(val) : sizeof(struct sctp_paddrthlds);
7246 	if (len < min)
7247 		return -EINVAL;
7248 	len = min;
7249 	if (copy_from_user(&val, optval, len))
7250 		return -EFAULT;
7251 
7252 	if (!sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
7253 		trans = sctp_addr_id2transport(sk, &val.spt_address,
7254 					       val.spt_assoc_id);
7255 		if (!trans)
7256 			return -ENOENT;
7257 
7258 		val.spt_pathmaxrxt = trans->pathmaxrxt;
7259 		val.spt_pathpfthld = trans->pf_retrans;
7260 		val.spt_pathcpthld = trans->ps_retrans;
7261 
7262 		goto out;
7263 	}
7264 
7265 	asoc = sctp_id2assoc(sk, val.spt_assoc_id);
7266 	if (!asoc && val.spt_assoc_id != SCTP_FUTURE_ASSOC &&
7267 	    sctp_style(sk, UDP))
7268 		return -EINVAL;
7269 
7270 	if (asoc) {
7271 		val.spt_pathpfthld = asoc->pf_retrans;
7272 		val.spt_pathmaxrxt = asoc->pathmaxrxt;
7273 		val.spt_pathcpthld = asoc->ps_retrans;
7274 	} else {
7275 		struct sctp_sock *sp = sctp_sk(sk);
7276 
7277 		val.spt_pathpfthld = sp->pf_retrans;
7278 		val.spt_pathmaxrxt = sp->pathmaxrxt;
7279 		val.spt_pathcpthld = sp->ps_retrans;
7280 	}
7281 
7282 out:
7283 	if (put_user(len, optlen) || copy_to_user(optval, &val, len))
7284 		return -EFAULT;
7285 
7286 	return 0;
7287 }
7288 
7289 /*
7290  * SCTP_GET_ASSOC_STATS
7291  *
7292  * This option retrieves local per endpoint statistics. It is modeled
7293  * after OpenSolaris' implementation
7294  */
7295 static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
7296 				       char __user *optval,
7297 				       int __user *optlen)
7298 {
7299 	struct sctp_assoc_stats sas;
7300 	struct sctp_association *asoc = NULL;
7301 
7302 	/* User must provide at least the assoc id */
7303 	if (len < sizeof(sctp_assoc_t))
7304 		return -EINVAL;
7305 
7306 	/* Allow the struct to grow and fill in as much as possible */
7307 	len = min_t(size_t, len, sizeof(sas));
7308 
7309 	if (copy_from_user(&sas, optval, len))
7310 		return -EFAULT;
7311 
7312 	asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
7313 	if (!asoc)
7314 		return -EINVAL;
7315 
7316 	sas.sas_rtxchunks = asoc->stats.rtxchunks;
7317 	sas.sas_gapcnt = asoc->stats.gapcnt;
7318 	sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
7319 	sas.sas_osacks = asoc->stats.osacks;
7320 	sas.sas_isacks = asoc->stats.isacks;
7321 	sas.sas_octrlchunks = asoc->stats.octrlchunks;
7322 	sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
7323 	sas.sas_oodchunks = asoc->stats.oodchunks;
7324 	sas.sas_iodchunks = asoc->stats.iodchunks;
7325 	sas.sas_ouodchunks = asoc->stats.ouodchunks;
7326 	sas.sas_iuodchunks = asoc->stats.iuodchunks;
7327 	sas.sas_idupchunks = asoc->stats.idupchunks;
7328 	sas.sas_opackets = asoc->stats.opackets;
7329 	sas.sas_ipackets = asoc->stats.ipackets;
7330 
7331 	/* New high max rto observed, will return 0 if not a single
7332 	 * RTO update took place. obs_rto_ipaddr will be bogus
7333 	 * in such a case
7334 	 */
7335 	sas.sas_maxrto = asoc->stats.max_obs_rto;
7336 	memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
7337 		sizeof(struct sockaddr_storage));
7338 
7339 	/* Mark beginning of a new observation period */
7340 	asoc->stats.max_obs_rto = asoc->rto_min;
7341 
7342 	if (put_user(len, optlen))
7343 		return -EFAULT;
7344 
7345 	pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
7346 
7347 	if (copy_to_user(optval, &sas, len))
7348 		return -EFAULT;
7349 
7350 	return 0;
7351 }
7352 
7353 static int sctp_getsockopt_recvrcvinfo(struct sock *sk,	int len,
7354 				       char __user *optval,
7355 				       int __user *optlen)
7356 {
7357 	int val = 0;
7358 
7359 	if (len < sizeof(int))
7360 		return -EINVAL;
7361 
7362 	len = sizeof(int);
7363 	if (sctp_sk(sk)->recvrcvinfo)
7364 		val = 1;
7365 	if (put_user(len, optlen))
7366 		return -EFAULT;
7367 	if (copy_to_user(optval, &val, len))
7368 		return -EFAULT;
7369 
7370 	return 0;
7371 }
7372 
7373 static int sctp_getsockopt_recvnxtinfo(struct sock *sk,	int len,
7374 				       char __user *optval,
7375 				       int __user *optlen)
7376 {
7377 	int val = 0;
7378 
7379 	if (len < sizeof(int))
7380 		return -EINVAL;
7381 
7382 	len = sizeof(int);
7383 	if (sctp_sk(sk)->recvnxtinfo)
7384 		val = 1;
7385 	if (put_user(len, optlen))
7386 		return -EFAULT;
7387 	if (copy_to_user(optval, &val, len))
7388 		return -EFAULT;
7389 
7390 	return 0;
7391 }
7392 
7393 static int sctp_getsockopt_pr_supported(struct sock *sk, int len,
7394 					char __user *optval,
7395 					int __user *optlen)
7396 {
7397 	struct sctp_assoc_value params;
7398 	struct sctp_association *asoc;
7399 	int retval = -EFAULT;
7400 
7401 	if (len < sizeof(params)) {
7402 		retval = -EINVAL;
7403 		goto out;
7404 	}
7405 
7406 	len = sizeof(params);
7407 	if (copy_from_user(&params, optval, len))
7408 		goto out;
7409 
7410 	asoc = sctp_id2assoc(sk, params.assoc_id);
7411 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7412 	    sctp_style(sk, UDP)) {
7413 		retval = -EINVAL;
7414 		goto out;
7415 	}
7416 
7417 	params.assoc_value = asoc ? asoc->peer.prsctp_capable
7418 				  : sctp_sk(sk)->ep->prsctp_enable;
7419 
7420 	if (put_user(len, optlen))
7421 		goto out;
7422 
7423 	if (copy_to_user(optval, &params, len))
7424 		goto out;
7425 
7426 	retval = 0;
7427 
7428 out:
7429 	return retval;
7430 }
7431 
7432 static int sctp_getsockopt_default_prinfo(struct sock *sk, int len,
7433 					  char __user *optval,
7434 					  int __user *optlen)
7435 {
7436 	struct sctp_default_prinfo info;
7437 	struct sctp_association *asoc;
7438 	int retval = -EFAULT;
7439 
7440 	if (len < sizeof(info)) {
7441 		retval = -EINVAL;
7442 		goto out;
7443 	}
7444 
7445 	len = sizeof(info);
7446 	if (copy_from_user(&info, optval, len))
7447 		goto out;
7448 
7449 	asoc = sctp_id2assoc(sk, info.pr_assoc_id);
7450 	if (!asoc && info.pr_assoc_id != SCTP_FUTURE_ASSOC &&
7451 	    sctp_style(sk, UDP)) {
7452 		retval = -EINVAL;
7453 		goto out;
7454 	}
7455 
7456 	if (asoc) {
7457 		info.pr_policy = SCTP_PR_POLICY(asoc->default_flags);
7458 		info.pr_value = asoc->default_timetolive;
7459 	} else {
7460 		struct sctp_sock *sp = sctp_sk(sk);
7461 
7462 		info.pr_policy = SCTP_PR_POLICY(sp->default_flags);
7463 		info.pr_value = sp->default_timetolive;
7464 	}
7465 
7466 	if (put_user(len, optlen))
7467 		goto out;
7468 
7469 	if (copy_to_user(optval, &info, len))
7470 		goto out;
7471 
7472 	retval = 0;
7473 
7474 out:
7475 	return retval;
7476 }
7477 
7478 static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
7479 					  char __user *optval,
7480 					  int __user *optlen)
7481 {
7482 	struct sctp_prstatus params;
7483 	struct sctp_association *asoc;
7484 	int policy;
7485 	int retval = -EINVAL;
7486 
7487 	if (len < sizeof(params))
7488 		goto out;
7489 
7490 	len = sizeof(params);
7491 	if (copy_from_user(&params, optval, len)) {
7492 		retval = -EFAULT;
7493 		goto out;
7494 	}
7495 
7496 	policy = params.sprstat_policy;
7497 	if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7498 	    ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7499 		goto out;
7500 
7501 	asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7502 	if (!asoc)
7503 		goto out;
7504 
7505 	if (policy == SCTP_PR_SCTP_ALL) {
7506 		params.sprstat_abandoned_unsent = 0;
7507 		params.sprstat_abandoned_sent = 0;
7508 		for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7509 			params.sprstat_abandoned_unsent +=
7510 				asoc->abandoned_unsent[policy];
7511 			params.sprstat_abandoned_sent +=
7512 				asoc->abandoned_sent[policy];
7513 		}
7514 	} else {
7515 		params.sprstat_abandoned_unsent =
7516 			asoc->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7517 		params.sprstat_abandoned_sent =
7518 			asoc->abandoned_sent[__SCTP_PR_INDEX(policy)];
7519 	}
7520 
7521 	if (put_user(len, optlen)) {
7522 		retval = -EFAULT;
7523 		goto out;
7524 	}
7525 
7526 	if (copy_to_user(optval, &params, len)) {
7527 		retval = -EFAULT;
7528 		goto out;
7529 	}
7530 
7531 	retval = 0;
7532 
7533 out:
7534 	return retval;
7535 }
7536 
7537 static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
7538 					   char __user *optval,
7539 					   int __user *optlen)
7540 {
7541 	struct sctp_stream_out_ext *streamoute;
7542 	struct sctp_association *asoc;
7543 	struct sctp_prstatus params;
7544 	int retval = -EINVAL;
7545 	int policy;
7546 
7547 	if (len < sizeof(params))
7548 		goto out;
7549 
7550 	len = sizeof(params);
7551 	if (copy_from_user(&params, optval, len)) {
7552 		retval = -EFAULT;
7553 		goto out;
7554 	}
7555 
7556 	policy = params.sprstat_policy;
7557 	if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7558 	    ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7559 		goto out;
7560 
7561 	asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7562 	if (!asoc || params.sprstat_sid >= asoc->stream.outcnt)
7563 		goto out;
7564 
7565 	streamoute = SCTP_SO(&asoc->stream, params.sprstat_sid)->ext;
7566 	if (!streamoute) {
7567 		/* Not allocated yet, means all stats are 0 */
7568 		params.sprstat_abandoned_unsent = 0;
7569 		params.sprstat_abandoned_sent = 0;
7570 		retval = 0;
7571 		goto out;
7572 	}
7573 
7574 	if (policy == SCTP_PR_SCTP_ALL) {
7575 		params.sprstat_abandoned_unsent = 0;
7576 		params.sprstat_abandoned_sent = 0;
7577 		for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7578 			params.sprstat_abandoned_unsent +=
7579 				streamoute->abandoned_unsent[policy];
7580 			params.sprstat_abandoned_sent +=
7581 				streamoute->abandoned_sent[policy];
7582 		}
7583 	} else {
7584 		params.sprstat_abandoned_unsent =
7585 			streamoute->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7586 		params.sprstat_abandoned_sent =
7587 			streamoute->abandoned_sent[__SCTP_PR_INDEX(policy)];
7588 	}
7589 
7590 	if (put_user(len, optlen) || copy_to_user(optval, &params, len)) {
7591 		retval = -EFAULT;
7592 		goto out;
7593 	}
7594 
7595 	retval = 0;
7596 
7597 out:
7598 	return retval;
7599 }
7600 
7601 static int sctp_getsockopt_reconfig_supported(struct sock *sk, int len,
7602 					      char __user *optval,
7603 					      int __user *optlen)
7604 {
7605 	struct sctp_assoc_value params;
7606 	struct sctp_association *asoc;
7607 	int retval = -EFAULT;
7608 
7609 	if (len < sizeof(params)) {
7610 		retval = -EINVAL;
7611 		goto out;
7612 	}
7613 
7614 	len = sizeof(params);
7615 	if (copy_from_user(&params, optval, len))
7616 		goto out;
7617 
7618 	asoc = sctp_id2assoc(sk, params.assoc_id);
7619 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7620 	    sctp_style(sk, UDP)) {
7621 		retval = -EINVAL;
7622 		goto out;
7623 	}
7624 
7625 	params.assoc_value = asoc ? asoc->peer.reconf_capable
7626 				  : sctp_sk(sk)->ep->reconf_enable;
7627 
7628 	if (put_user(len, optlen))
7629 		goto out;
7630 
7631 	if (copy_to_user(optval, &params, len))
7632 		goto out;
7633 
7634 	retval = 0;
7635 
7636 out:
7637 	return retval;
7638 }
7639 
7640 static int sctp_getsockopt_enable_strreset(struct sock *sk, int len,
7641 					   char __user *optval,
7642 					   int __user *optlen)
7643 {
7644 	struct sctp_assoc_value params;
7645 	struct sctp_association *asoc;
7646 	int retval = -EFAULT;
7647 
7648 	if (len < sizeof(params)) {
7649 		retval = -EINVAL;
7650 		goto out;
7651 	}
7652 
7653 	len = sizeof(params);
7654 	if (copy_from_user(&params, optval, len))
7655 		goto out;
7656 
7657 	asoc = sctp_id2assoc(sk, params.assoc_id);
7658 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7659 	    sctp_style(sk, UDP)) {
7660 		retval = -EINVAL;
7661 		goto out;
7662 	}
7663 
7664 	params.assoc_value = asoc ? asoc->strreset_enable
7665 				  : sctp_sk(sk)->ep->strreset_enable;
7666 
7667 	if (put_user(len, optlen))
7668 		goto out;
7669 
7670 	if (copy_to_user(optval, &params, len))
7671 		goto out;
7672 
7673 	retval = 0;
7674 
7675 out:
7676 	return retval;
7677 }
7678 
7679 static int sctp_getsockopt_scheduler(struct sock *sk, int len,
7680 				     char __user *optval,
7681 				     int __user *optlen)
7682 {
7683 	struct sctp_assoc_value params;
7684 	struct sctp_association *asoc;
7685 	int retval = -EFAULT;
7686 
7687 	if (len < sizeof(params)) {
7688 		retval = -EINVAL;
7689 		goto out;
7690 	}
7691 
7692 	len = sizeof(params);
7693 	if (copy_from_user(&params, optval, len))
7694 		goto out;
7695 
7696 	asoc = sctp_id2assoc(sk, params.assoc_id);
7697 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7698 	    sctp_style(sk, UDP)) {
7699 		retval = -EINVAL;
7700 		goto out;
7701 	}
7702 
7703 	params.assoc_value = asoc ? sctp_sched_get_sched(asoc)
7704 				  : sctp_sk(sk)->default_ss;
7705 
7706 	if (put_user(len, optlen))
7707 		goto out;
7708 
7709 	if (copy_to_user(optval, &params, len))
7710 		goto out;
7711 
7712 	retval = 0;
7713 
7714 out:
7715 	return retval;
7716 }
7717 
7718 static int sctp_getsockopt_scheduler_value(struct sock *sk, int len,
7719 					   char __user *optval,
7720 					   int __user *optlen)
7721 {
7722 	struct sctp_stream_value params;
7723 	struct sctp_association *asoc;
7724 	int retval = -EFAULT;
7725 
7726 	if (len < sizeof(params)) {
7727 		retval = -EINVAL;
7728 		goto out;
7729 	}
7730 
7731 	len = sizeof(params);
7732 	if (copy_from_user(&params, optval, len))
7733 		goto out;
7734 
7735 	asoc = sctp_id2assoc(sk, params.assoc_id);
7736 	if (!asoc) {
7737 		retval = -EINVAL;
7738 		goto out;
7739 	}
7740 
7741 	retval = sctp_sched_get_value(asoc, params.stream_id,
7742 				      &params.stream_value);
7743 	if (retval)
7744 		goto out;
7745 
7746 	if (put_user(len, optlen)) {
7747 		retval = -EFAULT;
7748 		goto out;
7749 	}
7750 
7751 	if (copy_to_user(optval, &params, len)) {
7752 		retval = -EFAULT;
7753 		goto out;
7754 	}
7755 
7756 out:
7757 	return retval;
7758 }
7759 
7760 static int sctp_getsockopt_interleaving_supported(struct sock *sk, int len,
7761 						  char __user *optval,
7762 						  int __user *optlen)
7763 {
7764 	struct sctp_assoc_value params;
7765 	struct sctp_association *asoc;
7766 	int retval = -EFAULT;
7767 
7768 	if (len < sizeof(params)) {
7769 		retval = -EINVAL;
7770 		goto out;
7771 	}
7772 
7773 	len = sizeof(params);
7774 	if (copy_from_user(&params, optval, len))
7775 		goto out;
7776 
7777 	asoc = sctp_id2assoc(sk, params.assoc_id);
7778 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7779 	    sctp_style(sk, UDP)) {
7780 		retval = -EINVAL;
7781 		goto out;
7782 	}
7783 
7784 	params.assoc_value = asoc ? asoc->peer.intl_capable
7785 				  : sctp_sk(sk)->ep->intl_enable;
7786 
7787 	if (put_user(len, optlen))
7788 		goto out;
7789 
7790 	if (copy_to_user(optval, &params, len))
7791 		goto out;
7792 
7793 	retval = 0;
7794 
7795 out:
7796 	return retval;
7797 }
7798 
7799 static int sctp_getsockopt_reuse_port(struct sock *sk, int len,
7800 				      char __user *optval,
7801 				      int __user *optlen)
7802 {
7803 	int val;
7804 
7805 	if (len < sizeof(int))
7806 		return -EINVAL;
7807 
7808 	len = sizeof(int);
7809 	val = sctp_sk(sk)->reuse;
7810 	if (put_user(len, optlen))
7811 		return -EFAULT;
7812 
7813 	if (copy_to_user(optval, &val, len))
7814 		return -EFAULT;
7815 
7816 	return 0;
7817 }
7818 
7819 static int sctp_getsockopt_event(struct sock *sk, int len, char __user *optval,
7820 				 int __user *optlen)
7821 {
7822 	struct sctp_association *asoc;
7823 	struct sctp_event param;
7824 	__u16 subscribe;
7825 
7826 	if (len < sizeof(param))
7827 		return -EINVAL;
7828 
7829 	len = sizeof(param);
7830 	if (copy_from_user(&param, optval, len))
7831 		return -EFAULT;
7832 
7833 	if (param.se_type < SCTP_SN_TYPE_BASE ||
7834 	    param.se_type > SCTP_SN_TYPE_MAX)
7835 		return -EINVAL;
7836 
7837 	asoc = sctp_id2assoc(sk, param.se_assoc_id);
7838 	if (!asoc && param.se_assoc_id != SCTP_FUTURE_ASSOC &&
7839 	    sctp_style(sk, UDP))
7840 		return -EINVAL;
7841 
7842 	subscribe = asoc ? asoc->subscribe : sctp_sk(sk)->subscribe;
7843 	param.se_on = sctp_ulpevent_type_enabled(subscribe, param.se_type);
7844 
7845 	if (put_user(len, optlen))
7846 		return -EFAULT;
7847 
7848 	if (copy_to_user(optval, &param, len))
7849 		return -EFAULT;
7850 
7851 	return 0;
7852 }
7853 
7854 static int sctp_getsockopt_asconf_supported(struct sock *sk, int len,
7855 					    char __user *optval,
7856 					    int __user *optlen)
7857 {
7858 	struct sctp_assoc_value params;
7859 	struct sctp_association *asoc;
7860 	int retval = -EFAULT;
7861 
7862 	if (len < sizeof(params)) {
7863 		retval = -EINVAL;
7864 		goto out;
7865 	}
7866 
7867 	len = sizeof(params);
7868 	if (copy_from_user(&params, optval, len))
7869 		goto out;
7870 
7871 	asoc = sctp_id2assoc(sk, params.assoc_id);
7872 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7873 	    sctp_style(sk, UDP)) {
7874 		retval = -EINVAL;
7875 		goto out;
7876 	}
7877 
7878 	params.assoc_value = asoc ? asoc->peer.asconf_capable
7879 				  : sctp_sk(sk)->ep->asconf_enable;
7880 
7881 	if (put_user(len, optlen))
7882 		goto out;
7883 
7884 	if (copy_to_user(optval, &params, len))
7885 		goto out;
7886 
7887 	retval = 0;
7888 
7889 out:
7890 	return retval;
7891 }
7892 
7893 static int sctp_getsockopt_auth_supported(struct sock *sk, int len,
7894 					  char __user *optval,
7895 					  int __user *optlen)
7896 {
7897 	struct sctp_assoc_value params;
7898 	struct sctp_association *asoc;
7899 	int retval = -EFAULT;
7900 
7901 	if (len < sizeof(params)) {
7902 		retval = -EINVAL;
7903 		goto out;
7904 	}
7905 
7906 	len = sizeof(params);
7907 	if (copy_from_user(&params, optval, len))
7908 		goto out;
7909 
7910 	asoc = sctp_id2assoc(sk, params.assoc_id);
7911 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7912 	    sctp_style(sk, UDP)) {
7913 		retval = -EINVAL;
7914 		goto out;
7915 	}
7916 
7917 	params.assoc_value = asoc ? asoc->peer.auth_capable
7918 				  : sctp_sk(sk)->ep->auth_enable;
7919 
7920 	if (put_user(len, optlen))
7921 		goto out;
7922 
7923 	if (copy_to_user(optval, &params, len))
7924 		goto out;
7925 
7926 	retval = 0;
7927 
7928 out:
7929 	return retval;
7930 }
7931 
7932 static int sctp_getsockopt_ecn_supported(struct sock *sk, int len,
7933 					 char __user *optval,
7934 					 int __user *optlen)
7935 {
7936 	struct sctp_assoc_value params;
7937 	struct sctp_association *asoc;
7938 	int retval = -EFAULT;
7939 
7940 	if (len < sizeof(params)) {
7941 		retval = -EINVAL;
7942 		goto out;
7943 	}
7944 
7945 	len = sizeof(params);
7946 	if (copy_from_user(&params, optval, len))
7947 		goto out;
7948 
7949 	asoc = sctp_id2assoc(sk, params.assoc_id);
7950 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7951 	    sctp_style(sk, UDP)) {
7952 		retval = -EINVAL;
7953 		goto out;
7954 	}
7955 
7956 	params.assoc_value = asoc ? asoc->peer.ecn_capable
7957 				  : sctp_sk(sk)->ep->ecn_enable;
7958 
7959 	if (put_user(len, optlen))
7960 		goto out;
7961 
7962 	if (copy_to_user(optval, &params, len))
7963 		goto out;
7964 
7965 	retval = 0;
7966 
7967 out:
7968 	return retval;
7969 }
7970 
7971 static int sctp_getsockopt_pf_expose(struct sock *sk, int len,
7972 				     char __user *optval,
7973 				     int __user *optlen)
7974 {
7975 	struct sctp_assoc_value params;
7976 	struct sctp_association *asoc;
7977 	int retval = -EFAULT;
7978 
7979 	if (len < sizeof(params)) {
7980 		retval = -EINVAL;
7981 		goto out;
7982 	}
7983 
7984 	len = sizeof(params);
7985 	if (copy_from_user(&params, optval, len))
7986 		goto out;
7987 
7988 	asoc = sctp_id2assoc(sk, params.assoc_id);
7989 	if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7990 	    sctp_style(sk, UDP)) {
7991 		retval = -EINVAL;
7992 		goto out;
7993 	}
7994 
7995 	params.assoc_value = asoc ? asoc->pf_expose
7996 				  : sctp_sk(sk)->pf_expose;
7997 
7998 	if (put_user(len, optlen))
7999 		goto out;
8000 
8001 	if (copy_to_user(optval, &params, len))
8002 		goto out;
8003 
8004 	retval = 0;
8005 
8006 out:
8007 	return retval;
8008 }
8009 
8010 static int sctp_getsockopt(struct sock *sk, int level, int optname,
8011 			   char __user *optval, int __user *optlen)
8012 {
8013 	int retval = 0;
8014 	int len;
8015 
8016 	pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
8017 
8018 	/* I can hardly begin to describe how wrong this is.  This is
8019 	 * so broken as to be worse than useless.  The API draft
8020 	 * REALLY is NOT helpful here...  I am not convinced that the
8021 	 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
8022 	 * are at all well-founded.
8023 	 */
8024 	if (level != SOL_SCTP) {
8025 		struct sctp_af *af = sctp_sk(sk)->pf->af;
8026 
8027 		retval = af->getsockopt(sk, level, optname, optval, optlen);
8028 		return retval;
8029 	}
8030 
8031 	if (get_user(len, optlen))
8032 		return -EFAULT;
8033 
8034 	if (len < 0)
8035 		return -EINVAL;
8036 
8037 	lock_sock(sk);
8038 
8039 	switch (optname) {
8040 	case SCTP_STATUS:
8041 		retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
8042 		break;
8043 	case SCTP_DISABLE_FRAGMENTS:
8044 		retval = sctp_getsockopt_disable_fragments(sk, len, optval,
8045 							   optlen);
8046 		break;
8047 	case SCTP_EVENTS:
8048 		retval = sctp_getsockopt_events(sk, len, optval, optlen);
8049 		break;
8050 	case SCTP_AUTOCLOSE:
8051 		retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
8052 		break;
8053 	case SCTP_SOCKOPT_PEELOFF:
8054 		retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
8055 		break;
8056 	case SCTP_SOCKOPT_PEELOFF_FLAGS:
8057 		retval = sctp_getsockopt_peeloff_flags(sk, len, optval, optlen);
8058 		break;
8059 	case SCTP_PEER_ADDR_PARAMS:
8060 		retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
8061 							  optlen);
8062 		break;
8063 	case SCTP_DELAYED_SACK:
8064 		retval = sctp_getsockopt_delayed_ack(sk, len, optval,
8065 							  optlen);
8066 		break;
8067 	case SCTP_INITMSG:
8068 		retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
8069 		break;
8070 	case SCTP_GET_PEER_ADDRS:
8071 		retval = sctp_getsockopt_peer_addrs(sk, len, optval,
8072 						    optlen);
8073 		break;
8074 	case SCTP_GET_LOCAL_ADDRS:
8075 		retval = sctp_getsockopt_local_addrs(sk, len, optval,
8076 						     optlen);
8077 		break;
8078 	case SCTP_SOCKOPT_CONNECTX3:
8079 		retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
8080 		break;
8081 	case SCTP_DEFAULT_SEND_PARAM:
8082 		retval = sctp_getsockopt_default_send_param(sk, len,
8083 							    optval, optlen);
8084 		break;
8085 	case SCTP_DEFAULT_SNDINFO:
8086 		retval = sctp_getsockopt_default_sndinfo(sk, len,
8087 							 optval, optlen);
8088 		break;
8089 	case SCTP_PRIMARY_ADDR:
8090 		retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
8091 		break;
8092 	case SCTP_NODELAY:
8093 		retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
8094 		break;
8095 	case SCTP_RTOINFO:
8096 		retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
8097 		break;
8098 	case SCTP_ASSOCINFO:
8099 		retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
8100 		break;
8101 	case SCTP_I_WANT_MAPPED_V4_ADDR:
8102 		retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
8103 		break;
8104 	case SCTP_MAXSEG:
8105 		retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
8106 		break;
8107 	case SCTP_GET_PEER_ADDR_INFO:
8108 		retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
8109 							optlen);
8110 		break;
8111 	case SCTP_ADAPTATION_LAYER:
8112 		retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
8113 							optlen);
8114 		break;
8115 	case SCTP_CONTEXT:
8116 		retval = sctp_getsockopt_context(sk, len, optval, optlen);
8117 		break;
8118 	case SCTP_FRAGMENT_INTERLEAVE:
8119 		retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
8120 							     optlen);
8121 		break;
8122 	case SCTP_PARTIAL_DELIVERY_POINT:
8123 		retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
8124 								optlen);
8125 		break;
8126 	case SCTP_MAX_BURST:
8127 		retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
8128 		break;
8129 	case SCTP_AUTH_KEY:
8130 	case SCTP_AUTH_CHUNK:
8131 	case SCTP_AUTH_DELETE_KEY:
8132 	case SCTP_AUTH_DEACTIVATE_KEY:
8133 		retval = -EOPNOTSUPP;
8134 		break;
8135 	case SCTP_HMAC_IDENT:
8136 		retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
8137 		break;
8138 	case SCTP_AUTH_ACTIVE_KEY:
8139 		retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
8140 		break;
8141 	case SCTP_PEER_AUTH_CHUNKS:
8142 		retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
8143 							optlen);
8144 		break;
8145 	case SCTP_LOCAL_AUTH_CHUNKS:
8146 		retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
8147 							optlen);
8148 		break;
8149 	case SCTP_GET_ASSOC_NUMBER:
8150 		retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
8151 		break;
8152 	case SCTP_GET_ASSOC_ID_LIST:
8153 		retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
8154 		break;
8155 	case SCTP_AUTO_ASCONF:
8156 		retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
8157 		break;
8158 	case SCTP_PEER_ADDR_THLDS:
8159 		retval = sctp_getsockopt_paddr_thresholds(sk, optval, len,
8160 							  optlen, false);
8161 		break;
8162 	case SCTP_PEER_ADDR_THLDS_V2:
8163 		retval = sctp_getsockopt_paddr_thresholds(sk, optval, len,
8164 							  optlen, true);
8165 		break;
8166 	case SCTP_GET_ASSOC_STATS:
8167 		retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
8168 		break;
8169 	case SCTP_RECVRCVINFO:
8170 		retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
8171 		break;
8172 	case SCTP_RECVNXTINFO:
8173 		retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
8174 		break;
8175 	case SCTP_PR_SUPPORTED:
8176 		retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
8177 		break;
8178 	case SCTP_DEFAULT_PRINFO:
8179 		retval = sctp_getsockopt_default_prinfo(sk, len, optval,
8180 							optlen);
8181 		break;
8182 	case SCTP_PR_ASSOC_STATUS:
8183 		retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
8184 							optlen);
8185 		break;
8186 	case SCTP_PR_STREAM_STATUS:
8187 		retval = sctp_getsockopt_pr_streamstatus(sk, len, optval,
8188 							 optlen);
8189 		break;
8190 	case SCTP_RECONFIG_SUPPORTED:
8191 		retval = sctp_getsockopt_reconfig_supported(sk, len, optval,
8192 							    optlen);
8193 		break;
8194 	case SCTP_ENABLE_STREAM_RESET:
8195 		retval = sctp_getsockopt_enable_strreset(sk, len, optval,
8196 							 optlen);
8197 		break;
8198 	case SCTP_STREAM_SCHEDULER:
8199 		retval = sctp_getsockopt_scheduler(sk, len, optval,
8200 						   optlen);
8201 		break;
8202 	case SCTP_STREAM_SCHEDULER_VALUE:
8203 		retval = sctp_getsockopt_scheduler_value(sk, len, optval,
8204 							 optlen);
8205 		break;
8206 	case SCTP_INTERLEAVING_SUPPORTED:
8207 		retval = sctp_getsockopt_interleaving_supported(sk, len, optval,
8208 								optlen);
8209 		break;
8210 	case SCTP_REUSE_PORT:
8211 		retval = sctp_getsockopt_reuse_port(sk, len, optval, optlen);
8212 		break;
8213 	case SCTP_EVENT:
8214 		retval = sctp_getsockopt_event(sk, len, optval, optlen);
8215 		break;
8216 	case SCTP_ASCONF_SUPPORTED:
8217 		retval = sctp_getsockopt_asconf_supported(sk, len, optval,
8218 							  optlen);
8219 		break;
8220 	case SCTP_AUTH_SUPPORTED:
8221 		retval = sctp_getsockopt_auth_supported(sk, len, optval,
8222 							optlen);
8223 		break;
8224 	case SCTP_ECN_SUPPORTED:
8225 		retval = sctp_getsockopt_ecn_supported(sk, len, optval, optlen);
8226 		break;
8227 	case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
8228 		retval = sctp_getsockopt_pf_expose(sk, len, optval, optlen);
8229 		break;
8230 	default:
8231 		retval = -ENOPROTOOPT;
8232 		break;
8233 	}
8234 
8235 	release_sock(sk);
8236 	return retval;
8237 }
8238 
8239 static int sctp_hash(struct sock *sk)
8240 {
8241 	/* STUB */
8242 	return 0;
8243 }
8244 
8245 static void sctp_unhash(struct sock *sk)
8246 {
8247 	/* STUB */
8248 }
8249 
8250 /* Check if port is acceptable.  Possibly find first available port.
8251  *
8252  * The port hash table (contained in the 'global' SCTP protocol storage
8253  * returned by struct sctp_protocol *sctp_get_protocol()). The hash
8254  * table is an array of 4096 lists (sctp_bind_hashbucket). Each
8255  * list (the list number is the port number hashed out, so as you
8256  * would expect from a hash function, all the ports in a given list have
8257  * such a number that hashes out to the same list number; you were
8258  * expecting that, right?); so each list has a set of ports, with a
8259  * link to the socket (struct sock) that uses it, the port number and
8260  * a fastreuse flag (FIXME: NPI ipg).
8261  */
8262 static struct sctp_bind_bucket *sctp_bucket_create(
8263 	struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
8264 
8265 static int sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
8266 {
8267 	struct sctp_sock *sp = sctp_sk(sk);
8268 	bool reuse = (sk->sk_reuse || sp->reuse);
8269 	struct sctp_bind_hashbucket *head; /* hash list */
8270 	struct net *net = sock_net(sk);
8271 	kuid_t uid = sock_i_uid(sk);
8272 	struct sctp_bind_bucket *pp;
8273 	unsigned short snum;
8274 	int ret;
8275 
8276 	snum = ntohs(addr->v4.sin_port);
8277 
8278 	pr_debug("%s: begins, snum:%d\n", __func__, snum);
8279 
8280 	local_bh_disable();
8281 
8282 	if (snum == 0) {
8283 		/* Search for an available port. */
8284 		int low, high, remaining, index;
8285 		unsigned int rover;
8286 
8287 		inet_get_local_port_range(net, &low, &high);
8288 		remaining = (high - low) + 1;
8289 		rover = prandom_u32() % remaining + low;
8290 
8291 		do {
8292 			rover++;
8293 			if ((rover < low) || (rover > high))
8294 				rover = low;
8295 			if (inet_is_local_reserved_port(net, rover))
8296 				continue;
8297 			index = sctp_phashfn(net, rover);
8298 			head = &sctp_port_hashtable[index];
8299 			spin_lock(&head->lock);
8300 			sctp_for_each_hentry(pp, &head->chain)
8301 				if ((pp->port == rover) &&
8302 				    net_eq(net, pp->net))
8303 					goto next;
8304 			break;
8305 		next:
8306 			spin_unlock(&head->lock);
8307 		} while (--remaining > 0);
8308 
8309 		/* Exhausted local port range during search? */
8310 		ret = 1;
8311 		if (remaining <= 0)
8312 			goto fail;
8313 
8314 		/* OK, here is the one we will use.  HEAD (the port
8315 		 * hash table list entry) is non-NULL and we hold it's
8316 		 * mutex.
8317 		 */
8318 		snum = rover;
8319 	} else {
8320 		/* We are given an specific port number; we verify
8321 		 * that it is not being used. If it is used, we will
8322 		 * exahust the search in the hash list corresponding
8323 		 * to the port number (snum) - we detect that with the
8324 		 * port iterator, pp being NULL.
8325 		 */
8326 		head = &sctp_port_hashtable[sctp_phashfn(net, snum)];
8327 		spin_lock(&head->lock);
8328 		sctp_for_each_hentry(pp, &head->chain) {
8329 			if ((pp->port == snum) && net_eq(pp->net, net))
8330 				goto pp_found;
8331 		}
8332 	}
8333 	pp = NULL;
8334 	goto pp_not_found;
8335 pp_found:
8336 	if (!hlist_empty(&pp->owner)) {
8337 		/* We had a port hash table hit - there is an
8338 		 * available port (pp != NULL) and it is being
8339 		 * used by other socket (pp->owner not empty); that other
8340 		 * socket is going to be sk2.
8341 		 */
8342 		struct sock *sk2;
8343 
8344 		pr_debug("%s: found a possible match\n", __func__);
8345 
8346 		if ((pp->fastreuse && reuse &&
8347 		     sk->sk_state != SCTP_SS_LISTENING) ||
8348 		    (pp->fastreuseport && sk->sk_reuseport &&
8349 		     uid_eq(pp->fastuid, uid)))
8350 			goto success;
8351 
8352 		/* Run through the list of sockets bound to the port
8353 		 * (pp->port) [via the pointers bind_next and
8354 		 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
8355 		 * we get the endpoint they describe and run through
8356 		 * the endpoint's list of IP (v4 or v6) addresses,
8357 		 * comparing each of the addresses with the address of
8358 		 * the socket sk. If we find a match, then that means
8359 		 * that this port/socket (sk) combination are already
8360 		 * in an endpoint.
8361 		 */
8362 		sk_for_each_bound(sk2, &pp->owner) {
8363 			struct sctp_sock *sp2 = sctp_sk(sk2);
8364 			struct sctp_endpoint *ep2 = sp2->ep;
8365 
8366 			if (sk == sk2 ||
8367 			    (reuse && (sk2->sk_reuse || sp2->reuse) &&
8368 			     sk2->sk_state != SCTP_SS_LISTENING) ||
8369 			    (sk->sk_reuseport && sk2->sk_reuseport &&
8370 			     uid_eq(uid, sock_i_uid(sk2))))
8371 				continue;
8372 
8373 			if (sctp_bind_addr_conflict(&ep2->base.bind_addr,
8374 						    addr, sp2, sp)) {
8375 				ret = 1;
8376 				goto fail_unlock;
8377 			}
8378 		}
8379 
8380 		pr_debug("%s: found a match\n", __func__);
8381 	}
8382 pp_not_found:
8383 	/* If there was a hash table miss, create a new port.  */
8384 	ret = 1;
8385 	if (!pp && !(pp = sctp_bucket_create(head, net, snum)))
8386 		goto fail_unlock;
8387 
8388 	/* In either case (hit or miss), make sure fastreuse is 1 only
8389 	 * if sk->sk_reuse is too (that is, if the caller requested
8390 	 * SO_REUSEADDR on this socket -sk-).
8391 	 */
8392 	if (hlist_empty(&pp->owner)) {
8393 		if (reuse && sk->sk_state != SCTP_SS_LISTENING)
8394 			pp->fastreuse = 1;
8395 		else
8396 			pp->fastreuse = 0;
8397 
8398 		if (sk->sk_reuseport) {
8399 			pp->fastreuseport = 1;
8400 			pp->fastuid = uid;
8401 		} else {
8402 			pp->fastreuseport = 0;
8403 		}
8404 	} else {
8405 		if (pp->fastreuse &&
8406 		    (!reuse || sk->sk_state == SCTP_SS_LISTENING))
8407 			pp->fastreuse = 0;
8408 
8409 		if (pp->fastreuseport &&
8410 		    (!sk->sk_reuseport || !uid_eq(pp->fastuid, uid)))
8411 			pp->fastreuseport = 0;
8412 	}
8413 
8414 	/* We are set, so fill up all the data in the hash table
8415 	 * entry, tie the socket list information with the rest of the
8416 	 * sockets FIXME: Blurry, NPI (ipg).
8417 	 */
8418 success:
8419 	if (!sp->bind_hash) {
8420 		inet_sk(sk)->inet_num = snum;
8421 		sk_add_bind_node(sk, &pp->owner);
8422 		sp->bind_hash = pp;
8423 	}
8424 	ret = 0;
8425 
8426 fail_unlock:
8427 	spin_unlock(&head->lock);
8428 
8429 fail:
8430 	local_bh_enable();
8431 	return ret;
8432 }
8433 
8434 /* Assign a 'snum' port to the socket.  If snum == 0, an ephemeral
8435  * port is requested.
8436  */
8437 static int sctp_get_port(struct sock *sk, unsigned short snum)
8438 {
8439 	union sctp_addr addr;
8440 	struct sctp_af *af = sctp_sk(sk)->pf->af;
8441 
8442 	/* Set up a dummy address struct from the sk. */
8443 	af->from_sk(&addr, sk);
8444 	addr.v4.sin_port = htons(snum);
8445 
8446 	/* Note: sk->sk_num gets filled in if ephemeral port request. */
8447 	return sctp_get_port_local(sk, &addr);
8448 }
8449 
8450 /*
8451  *  Move a socket to LISTENING state.
8452  */
8453 static int sctp_listen_start(struct sock *sk, int backlog)
8454 {
8455 	struct sctp_sock *sp = sctp_sk(sk);
8456 	struct sctp_endpoint *ep = sp->ep;
8457 	struct crypto_shash *tfm = NULL;
8458 	char alg[32];
8459 
8460 	/* Allocate HMAC for generating cookie. */
8461 	if (!sp->hmac && sp->sctp_hmac_alg) {
8462 		sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
8463 		tfm = crypto_alloc_shash(alg, 0, 0);
8464 		if (IS_ERR(tfm)) {
8465 			net_info_ratelimited("failed to load transform for %s: %ld\n",
8466 					     sp->sctp_hmac_alg, PTR_ERR(tfm));
8467 			return -ENOSYS;
8468 		}
8469 		sctp_sk(sk)->hmac = tfm;
8470 	}
8471 
8472 	/*
8473 	 * If a bind() or sctp_bindx() is not called prior to a listen()
8474 	 * call that allows new associations to be accepted, the system
8475 	 * picks an ephemeral port and will choose an address set equivalent
8476 	 * to binding with a wildcard address.
8477 	 *
8478 	 * This is not currently spelled out in the SCTP sockets
8479 	 * extensions draft, but follows the practice as seen in TCP
8480 	 * sockets.
8481 	 *
8482 	 */
8483 	inet_sk_set_state(sk, SCTP_SS_LISTENING);
8484 	if (!ep->base.bind_addr.port) {
8485 		if (sctp_autobind(sk))
8486 			return -EAGAIN;
8487 	} else {
8488 		if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
8489 			inet_sk_set_state(sk, SCTP_SS_CLOSED);
8490 			return -EADDRINUSE;
8491 		}
8492 	}
8493 
8494 	WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
8495 	return sctp_hash_endpoint(ep);
8496 }
8497 
8498 /*
8499  * 4.1.3 / 5.1.3 listen()
8500  *
8501  *   By default, new associations are not accepted for UDP style sockets.
8502  *   An application uses listen() to mark a socket as being able to
8503  *   accept new associations.
8504  *
8505  *   On TCP style sockets, applications use listen() to ready the SCTP
8506  *   endpoint for accepting inbound associations.
8507  *
8508  *   On both types of endpoints a backlog of '0' disables listening.
8509  *
8510  *  Move a socket to LISTENING state.
8511  */
8512 int sctp_inet_listen(struct socket *sock, int backlog)
8513 {
8514 	struct sock *sk = sock->sk;
8515 	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
8516 	int err = -EINVAL;
8517 
8518 	if (unlikely(backlog < 0))
8519 		return err;
8520 
8521 	lock_sock(sk);
8522 
8523 	/* Peeled-off sockets are not allowed to listen().  */
8524 	if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
8525 		goto out;
8526 
8527 	if (sock->state != SS_UNCONNECTED)
8528 		goto out;
8529 
8530 	if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
8531 		goto out;
8532 
8533 	/* If backlog is zero, disable listening. */
8534 	if (!backlog) {
8535 		if (sctp_sstate(sk, CLOSED))
8536 			goto out;
8537 
8538 		err = 0;
8539 		sctp_unhash_endpoint(ep);
8540 		sk->sk_state = SCTP_SS_CLOSED;
8541 		if (sk->sk_reuse || sctp_sk(sk)->reuse)
8542 			sctp_sk(sk)->bind_hash->fastreuse = 1;
8543 		goto out;
8544 	}
8545 
8546 	/* If we are already listening, just update the backlog */
8547 	if (sctp_sstate(sk, LISTENING))
8548 		WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
8549 	else {
8550 		err = sctp_listen_start(sk, backlog);
8551 		if (err)
8552 			goto out;
8553 	}
8554 
8555 	err = 0;
8556 out:
8557 	release_sock(sk);
8558 	return err;
8559 }
8560 
8561 /*
8562  * This function is done by modeling the current datagram_poll() and the
8563  * tcp_poll().  Note that, based on these implementations, we don't
8564  * lock the socket in this function, even though it seems that,
8565  * ideally, locking or some other mechanisms can be used to ensure
8566  * the integrity of the counters (sndbuf and wmem_alloc) used
8567  * in this place.  We assume that we don't need locks either until proven
8568  * otherwise.
8569  *
8570  * Another thing to note is that we include the Async I/O support
8571  * here, again, by modeling the current TCP/UDP code.  We don't have
8572  * a good way to test with it yet.
8573  */
8574 __poll_t sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
8575 {
8576 	struct sock *sk = sock->sk;
8577 	struct sctp_sock *sp = sctp_sk(sk);
8578 	__poll_t mask;
8579 
8580 	poll_wait(file, sk_sleep(sk), wait);
8581 
8582 	sock_rps_record_flow(sk);
8583 
8584 	/* A TCP-style listening socket becomes readable when the accept queue
8585 	 * is not empty.
8586 	 */
8587 	if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
8588 		return (!list_empty(&sp->ep->asocs)) ?
8589 			(EPOLLIN | EPOLLRDNORM) : 0;
8590 
8591 	mask = 0;
8592 
8593 	/* Is there any exceptional events?  */
8594 	if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
8595 		mask |= EPOLLERR |
8596 			(sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
8597 	if (sk->sk_shutdown & RCV_SHUTDOWN)
8598 		mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
8599 	if (sk->sk_shutdown == SHUTDOWN_MASK)
8600 		mask |= EPOLLHUP;
8601 
8602 	/* Is it readable?  Reconsider this code with TCP-style support.  */
8603 	if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
8604 		mask |= EPOLLIN | EPOLLRDNORM;
8605 
8606 	/* The association is either gone or not ready.  */
8607 	if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
8608 		return mask;
8609 
8610 	/* Is it writable?  */
8611 	if (sctp_writeable(sk)) {
8612 		mask |= EPOLLOUT | EPOLLWRNORM;
8613 	} else {
8614 		sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
8615 		/*
8616 		 * Since the socket is not locked, the buffer
8617 		 * might be made available after the writeable check and
8618 		 * before the bit is set.  This could cause a lost I/O
8619 		 * signal.  tcp_poll() has a race breaker for this race
8620 		 * condition.  Based on their implementation, we put
8621 		 * in the following code to cover it as well.
8622 		 */
8623 		if (sctp_writeable(sk))
8624 			mask |= EPOLLOUT | EPOLLWRNORM;
8625 	}
8626 	return mask;
8627 }
8628 
8629 /********************************************************************
8630  * 2nd Level Abstractions
8631  ********************************************************************/
8632 
8633 static struct sctp_bind_bucket *sctp_bucket_create(
8634 	struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
8635 {
8636 	struct sctp_bind_bucket *pp;
8637 
8638 	pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
8639 	if (pp) {
8640 		SCTP_DBG_OBJCNT_INC(bind_bucket);
8641 		pp->port = snum;
8642 		pp->fastreuse = 0;
8643 		INIT_HLIST_HEAD(&pp->owner);
8644 		pp->net = net;
8645 		hlist_add_head(&pp->node, &head->chain);
8646 	}
8647 	return pp;
8648 }
8649 
8650 /* Caller must hold hashbucket lock for this tb with local BH disabled */
8651 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
8652 {
8653 	if (pp && hlist_empty(&pp->owner)) {
8654 		__hlist_del(&pp->node);
8655 		kmem_cache_free(sctp_bucket_cachep, pp);
8656 		SCTP_DBG_OBJCNT_DEC(bind_bucket);
8657 	}
8658 }
8659 
8660 /* Release this socket's reference to a local port.  */
8661 static inline void __sctp_put_port(struct sock *sk)
8662 {
8663 	struct sctp_bind_hashbucket *head =
8664 		&sctp_port_hashtable[sctp_phashfn(sock_net(sk),
8665 						  inet_sk(sk)->inet_num)];
8666 	struct sctp_bind_bucket *pp;
8667 
8668 	spin_lock(&head->lock);
8669 	pp = sctp_sk(sk)->bind_hash;
8670 	__sk_del_bind_node(sk);
8671 	sctp_sk(sk)->bind_hash = NULL;
8672 	inet_sk(sk)->inet_num = 0;
8673 	sctp_bucket_destroy(pp);
8674 	spin_unlock(&head->lock);
8675 }
8676 
8677 void sctp_put_port(struct sock *sk)
8678 {
8679 	local_bh_disable();
8680 	__sctp_put_port(sk);
8681 	local_bh_enable();
8682 }
8683 
8684 /*
8685  * The system picks an ephemeral port and choose an address set equivalent
8686  * to binding with a wildcard address.
8687  * One of those addresses will be the primary address for the association.
8688  * This automatically enables the multihoming capability of SCTP.
8689  */
8690 static int sctp_autobind(struct sock *sk)
8691 {
8692 	union sctp_addr autoaddr;
8693 	struct sctp_af *af;
8694 	__be16 port;
8695 
8696 	/* Initialize a local sockaddr structure to INADDR_ANY. */
8697 	af = sctp_sk(sk)->pf->af;
8698 
8699 	port = htons(inet_sk(sk)->inet_num);
8700 	af->inaddr_any(&autoaddr, port);
8701 
8702 	return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
8703 }
8704 
8705 /* Parse out IPPROTO_SCTP CMSG headers.  Perform only minimal validation.
8706  *
8707  * From RFC 2292
8708  * 4.2 The cmsghdr Structure *
8709  *
8710  * When ancillary data is sent or received, any number of ancillary data
8711  * objects can be specified by the msg_control and msg_controllen members of
8712  * the msghdr structure, because each object is preceded by
8713  * a cmsghdr structure defining the object's length (the cmsg_len member).
8714  * Historically Berkeley-derived implementations have passed only one object
8715  * at a time, but this API allows multiple objects to be
8716  * passed in a single call to sendmsg() or recvmsg(). The following example
8717  * shows two ancillary data objects in a control buffer.
8718  *
8719  *   |<--------------------------- msg_controllen -------------------------->|
8720  *   |                                                                       |
8721  *
8722  *   |<----- ancillary data object ----->|<----- ancillary data object ----->|
8723  *
8724  *   |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
8725  *   |                                   |                                   |
8726  *
8727  *   |<---------- cmsg_len ---------->|  |<--------- cmsg_len ----------->|  |
8728  *
8729  *   |<--------- CMSG_LEN() --------->|  |<-------- CMSG_LEN() ---------->|  |
8730  *   |                                |  |                                |  |
8731  *
8732  *   +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8733  *   |cmsg_|cmsg_|cmsg_|XX|           |XX|cmsg_|cmsg_|cmsg_|XX|           |XX|
8734  *
8735  *   |len  |level|type |XX|cmsg_data[]|XX|len  |level|type |XX|cmsg_data[]|XX|
8736  *
8737  *   +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8738  *    ^
8739  *    |
8740  *
8741  * msg_control
8742  * points here
8743  */
8744 static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
8745 {
8746 	struct msghdr *my_msg = (struct msghdr *)msg;
8747 	struct cmsghdr *cmsg;
8748 
8749 	for_each_cmsghdr(cmsg, my_msg) {
8750 		if (!CMSG_OK(my_msg, cmsg))
8751 			return -EINVAL;
8752 
8753 		/* Should we parse this header or ignore?  */
8754 		if (cmsg->cmsg_level != IPPROTO_SCTP)
8755 			continue;
8756 
8757 		/* Strictly check lengths following example in SCM code.  */
8758 		switch (cmsg->cmsg_type) {
8759 		case SCTP_INIT:
8760 			/* SCTP Socket API Extension
8761 			 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
8762 			 *
8763 			 * This cmsghdr structure provides information for
8764 			 * initializing new SCTP associations with sendmsg().
8765 			 * The SCTP_INITMSG socket option uses this same data
8766 			 * structure.  This structure is not used for
8767 			 * recvmsg().
8768 			 *
8769 			 * cmsg_level    cmsg_type      cmsg_data[]
8770 			 * ------------  ------------   ----------------------
8771 			 * IPPROTO_SCTP  SCTP_INIT      struct sctp_initmsg
8772 			 */
8773 			if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
8774 				return -EINVAL;
8775 
8776 			cmsgs->init = CMSG_DATA(cmsg);
8777 			break;
8778 
8779 		case SCTP_SNDRCV:
8780 			/* SCTP Socket API Extension
8781 			 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
8782 			 *
8783 			 * This cmsghdr structure specifies SCTP options for
8784 			 * sendmsg() and describes SCTP header information
8785 			 * about a received message through recvmsg().
8786 			 *
8787 			 * cmsg_level    cmsg_type      cmsg_data[]
8788 			 * ------------  ------------   ----------------------
8789 			 * IPPROTO_SCTP  SCTP_SNDRCV    struct sctp_sndrcvinfo
8790 			 */
8791 			if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
8792 				return -EINVAL;
8793 
8794 			cmsgs->srinfo = CMSG_DATA(cmsg);
8795 
8796 			if (cmsgs->srinfo->sinfo_flags &
8797 			    ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8798 			      SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8799 			      SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8800 				return -EINVAL;
8801 			break;
8802 
8803 		case SCTP_SNDINFO:
8804 			/* SCTP Socket API Extension
8805 			 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
8806 			 *
8807 			 * This cmsghdr structure specifies SCTP options for
8808 			 * sendmsg(). This structure and SCTP_RCVINFO replaces
8809 			 * SCTP_SNDRCV which has been deprecated.
8810 			 *
8811 			 * cmsg_level    cmsg_type      cmsg_data[]
8812 			 * ------------  ------------   ---------------------
8813 			 * IPPROTO_SCTP  SCTP_SNDINFO    struct sctp_sndinfo
8814 			 */
8815 			if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
8816 				return -EINVAL;
8817 
8818 			cmsgs->sinfo = CMSG_DATA(cmsg);
8819 
8820 			if (cmsgs->sinfo->snd_flags &
8821 			    ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8822 			      SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8823 			      SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8824 				return -EINVAL;
8825 			break;
8826 		case SCTP_PRINFO:
8827 			/* SCTP Socket API Extension
8828 			 * 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)
8829 			 *
8830 			 * This cmsghdr structure specifies SCTP options for sendmsg().
8831 			 *
8832 			 * cmsg_level    cmsg_type      cmsg_data[]
8833 			 * ------------  ------------   ---------------------
8834 			 * IPPROTO_SCTP  SCTP_PRINFO    struct sctp_prinfo
8835 			 */
8836 			if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_prinfo)))
8837 				return -EINVAL;
8838 
8839 			cmsgs->prinfo = CMSG_DATA(cmsg);
8840 			if (cmsgs->prinfo->pr_policy & ~SCTP_PR_SCTP_MASK)
8841 				return -EINVAL;
8842 
8843 			if (cmsgs->prinfo->pr_policy == SCTP_PR_SCTP_NONE)
8844 				cmsgs->prinfo->pr_value = 0;
8845 			break;
8846 		case SCTP_AUTHINFO:
8847 			/* SCTP Socket API Extension
8848 			 * 5.3.8 SCTP AUTH Information Structure (SCTP_AUTHINFO)
8849 			 *
8850 			 * This cmsghdr structure specifies SCTP options for sendmsg().
8851 			 *
8852 			 * cmsg_level    cmsg_type      cmsg_data[]
8853 			 * ------------  ------------   ---------------------
8854 			 * IPPROTO_SCTP  SCTP_AUTHINFO  struct sctp_authinfo
8855 			 */
8856 			if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_authinfo)))
8857 				return -EINVAL;
8858 
8859 			cmsgs->authinfo = CMSG_DATA(cmsg);
8860 			break;
8861 		case SCTP_DSTADDRV4:
8862 		case SCTP_DSTADDRV6:
8863 			/* SCTP Socket API Extension
8864 			 * 5.3.9/10 SCTP Destination IPv4/6 Address Structure (SCTP_DSTADDRV4/6)
8865 			 *
8866 			 * This cmsghdr structure specifies SCTP options for sendmsg().
8867 			 *
8868 			 * cmsg_level    cmsg_type         cmsg_data[]
8869 			 * ------------  ------------   ---------------------
8870 			 * IPPROTO_SCTP  SCTP_DSTADDRV4 struct in_addr
8871 			 * ------------  ------------   ---------------------
8872 			 * IPPROTO_SCTP  SCTP_DSTADDRV6 struct in6_addr
8873 			 */
8874 			cmsgs->addrs_msg = my_msg;
8875 			break;
8876 		default:
8877 			return -EINVAL;
8878 		}
8879 	}
8880 
8881 	return 0;
8882 }
8883 
8884 /*
8885  * Wait for a packet..
8886  * Note: This function is the same function as in core/datagram.c
8887  * with a few modifications to make lksctp work.
8888  */
8889 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
8890 {
8891 	int error;
8892 	DEFINE_WAIT(wait);
8893 
8894 	prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
8895 
8896 	/* Socket errors? */
8897 	error = sock_error(sk);
8898 	if (error)
8899 		goto out;
8900 
8901 	if (!skb_queue_empty(&sk->sk_receive_queue))
8902 		goto ready;
8903 
8904 	/* Socket shut down?  */
8905 	if (sk->sk_shutdown & RCV_SHUTDOWN)
8906 		goto out;
8907 
8908 	/* Sequenced packets can come disconnected.  If so we report the
8909 	 * problem.
8910 	 */
8911 	error = -ENOTCONN;
8912 
8913 	/* Is there a good reason to think that we may receive some data?  */
8914 	if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
8915 		goto out;
8916 
8917 	/* Handle signals.  */
8918 	if (signal_pending(current))
8919 		goto interrupted;
8920 
8921 	/* Let another process have a go.  Since we are going to sleep
8922 	 * anyway.  Note: This may cause odd behaviors if the message
8923 	 * does not fit in the user's buffer, but this seems to be the
8924 	 * only way to honor MSG_DONTWAIT realistically.
8925 	 */
8926 	release_sock(sk);
8927 	*timeo_p = schedule_timeout(*timeo_p);
8928 	lock_sock(sk);
8929 
8930 ready:
8931 	finish_wait(sk_sleep(sk), &wait);
8932 	return 0;
8933 
8934 interrupted:
8935 	error = sock_intr_errno(*timeo_p);
8936 
8937 out:
8938 	finish_wait(sk_sleep(sk), &wait);
8939 	*err = error;
8940 	return error;
8941 }
8942 
8943 /* Receive a datagram.
8944  * Note: This is pretty much the same routine as in core/datagram.c
8945  * with a few changes to make lksctp work.
8946  */
8947 struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
8948 				       int noblock, int *err)
8949 {
8950 	int error;
8951 	struct sk_buff *skb;
8952 	long timeo;
8953 
8954 	timeo = sock_rcvtimeo(sk, noblock);
8955 
8956 	pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
8957 		 MAX_SCHEDULE_TIMEOUT);
8958 
8959 	do {
8960 		/* Again only user level code calls this function,
8961 		 * so nothing interrupt level
8962 		 * will suddenly eat the receive_queue.
8963 		 *
8964 		 *  Look at current nfs client by the way...
8965 		 *  However, this function was correct in any case. 8)
8966 		 */
8967 		if (flags & MSG_PEEK) {
8968 			skb = skb_peek(&sk->sk_receive_queue);
8969 			if (skb)
8970 				refcount_inc(&skb->users);
8971 		} else {
8972 			skb = __skb_dequeue(&sk->sk_receive_queue);
8973 		}
8974 
8975 		if (skb)
8976 			return skb;
8977 
8978 		/* Caller is allowed not to check sk->sk_err before calling. */
8979 		error = sock_error(sk);
8980 		if (error)
8981 			goto no_packet;
8982 
8983 		if (sk->sk_shutdown & RCV_SHUTDOWN)
8984 			break;
8985 
8986 		if (sk_can_busy_loop(sk)) {
8987 			sk_busy_loop(sk, noblock);
8988 
8989 			if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
8990 				continue;
8991 		}
8992 
8993 		/* User doesn't want to wait.  */
8994 		error = -EAGAIN;
8995 		if (!timeo)
8996 			goto no_packet;
8997 	} while (sctp_wait_for_packet(sk, err, &timeo) == 0);
8998 
8999 	return NULL;
9000 
9001 no_packet:
9002 	*err = error;
9003 	return NULL;
9004 }
9005 
9006 /* If sndbuf has changed, wake up per association sndbuf waiters.  */
9007 static void __sctp_write_space(struct sctp_association *asoc)
9008 {
9009 	struct sock *sk = asoc->base.sk;
9010 
9011 	if (sctp_wspace(asoc) <= 0)
9012 		return;
9013 
9014 	if (waitqueue_active(&asoc->wait))
9015 		wake_up_interruptible(&asoc->wait);
9016 
9017 	if (sctp_writeable(sk)) {
9018 		struct socket_wq *wq;
9019 
9020 		rcu_read_lock();
9021 		wq = rcu_dereference(sk->sk_wq);
9022 		if (wq) {
9023 			if (waitqueue_active(&wq->wait))
9024 				wake_up_interruptible(&wq->wait);
9025 
9026 			/* Note that we try to include the Async I/O support
9027 			 * here by modeling from the current TCP/UDP code.
9028 			 * We have not tested with it yet.
9029 			 */
9030 			if (!(sk->sk_shutdown & SEND_SHUTDOWN))
9031 				sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
9032 		}
9033 		rcu_read_unlock();
9034 	}
9035 }
9036 
9037 static void sctp_wake_up_waiters(struct sock *sk,
9038 				 struct sctp_association *asoc)
9039 {
9040 	struct sctp_association *tmp = asoc;
9041 
9042 	/* We do accounting for the sndbuf space per association,
9043 	 * so we only need to wake our own association.
9044 	 */
9045 	if (asoc->ep->sndbuf_policy)
9046 		return __sctp_write_space(asoc);
9047 
9048 	/* If association goes down and is just flushing its
9049 	 * outq, then just normally notify others.
9050 	 */
9051 	if (asoc->base.dead)
9052 		return sctp_write_space(sk);
9053 
9054 	/* Accounting for the sndbuf space is per socket, so we
9055 	 * need to wake up others, try to be fair and in case of
9056 	 * other associations, let them have a go first instead
9057 	 * of just doing a sctp_write_space() call.
9058 	 *
9059 	 * Note that we reach sctp_wake_up_waiters() only when
9060 	 * associations free up queued chunks, thus we are under
9061 	 * lock and the list of associations on a socket is
9062 	 * guaranteed not to change.
9063 	 */
9064 	for (tmp = list_next_entry(tmp, asocs); 1;
9065 	     tmp = list_next_entry(tmp, asocs)) {
9066 		/* Manually skip the head element. */
9067 		if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
9068 			continue;
9069 		/* Wake up association. */
9070 		__sctp_write_space(tmp);
9071 		/* We've reached the end. */
9072 		if (tmp == asoc)
9073 			break;
9074 	}
9075 }
9076 
9077 /* Do accounting for the sndbuf space.
9078  * Decrement the used sndbuf space of the corresponding association by the
9079  * data size which was just transmitted(freed).
9080  */
9081 static void sctp_wfree(struct sk_buff *skb)
9082 {
9083 	struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
9084 	struct sctp_association *asoc = chunk->asoc;
9085 	struct sock *sk = asoc->base.sk;
9086 
9087 	sk_mem_uncharge(sk, skb->truesize);
9088 	sk->sk_wmem_queued -= skb->truesize + sizeof(struct sctp_chunk);
9089 	asoc->sndbuf_used -= skb->truesize + sizeof(struct sctp_chunk);
9090 	WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk),
9091 				      &sk->sk_wmem_alloc));
9092 
9093 	if (chunk->shkey) {
9094 		struct sctp_shared_key *shkey = chunk->shkey;
9095 
9096 		/* refcnt == 2 and !list_empty mean after this release, it's
9097 		 * not being used anywhere, and it's time to notify userland
9098 		 * that this shkey can be freed if it's been deactivated.
9099 		 */
9100 		if (shkey->deactivated && !list_empty(&shkey->key_list) &&
9101 		    refcount_read(&shkey->refcnt) == 2) {
9102 			struct sctp_ulpevent *ev;
9103 
9104 			ev = sctp_ulpevent_make_authkey(asoc, shkey->key_id,
9105 							SCTP_AUTH_FREE_KEY,
9106 							GFP_KERNEL);
9107 			if (ev)
9108 				asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
9109 		}
9110 		sctp_auth_shkey_release(chunk->shkey);
9111 	}
9112 
9113 	sock_wfree(skb);
9114 	sctp_wake_up_waiters(sk, asoc);
9115 
9116 	sctp_association_put(asoc);
9117 }
9118 
9119 /* Do accounting for the receive space on the socket.
9120  * Accounting for the association is done in ulpevent.c
9121  * We set this as a destructor for the cloned data skbs so that
9122  * accounting is done at the correct time.
9123  */
9124 void sctp_sock_rfree(struct sk_buff *skb)
9125 {
9126 	struct sock *sk = skb->sk;
9127 	struct sctp_ulpevent *event = sctp_skb2event(skb);
9128 
9129 	atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
9130 
9131 	/*
9132 	 * Mimic the behavior of sock_rfree
9133 	 */
9134 	sk_mem_uncharge(sk, event->rmem_len);
9135 }
9136 
9137 
9138 /* Helper function to wait for space in the sndbuf.  */
9139 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
9140 				size_t msg_len)
9141 {
9142 	struct sock *sk = asoc->base.sk;
9143 	long current_timeo = *timeo_p;
9144 	DEFINE_WAIT(wait);
9145 	int err = 0;
9146 
9147 	pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
9148 		 *timeo_p, msg_len);
9149 
9150 	/* Increment the association's refcnt.  */
9151 	sctp_association_hold(asoc);
9152 
9153 	/* Wait on the association specific sndbuf space. */
9154 	for (;;) {
9155 		prepare_to_wait_exclusive(&asoc->wait, &wait,
9156 					  TASK_INTERRUPTIBLE);
9157 		if (asoc->base.dead)
9158 			goto do_dead;
9159 		if (!*timeo_p)
9160 			goto do_nonblock;
9161 		if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING)
9162 			goto do_error;
9163 		if (signal_pending(current))
9164 			goto do_interrupted;
9165 		if (sk_under_memory_pressure(sk))
9166 			sk_mem_reclaim(sk);
9167 		if ((int)msg_len <= sctp_wspace(asoc) &&
9168 		    sk_wmem_schedule(sk, msg_len))
9169 			break;
9170 
9171 		/* Let another process have a go.  Since we are going
9172 		 * to sleep anyway.
9173 		 */
9174 		release_sock(sk);
9175 		current_timeo = schedule_timeout(current_timeo);
9176 		lock_sock(sk);
9177 		if (sk != asoc->base.sk)
9178 			goto do_error;
9179 
9180 		*timeo_p = current_timeo;
9181 	}
9182 
9183 out:
9184 	finish_wait(&asoc->wait, &wait);
9185 
9186 	/* Release the association's refcnt.  */
9187 	sctp_association_put(asoc);
9188 
9189 	return err;
9190 
9191 do_dead:
9192 	err = -ESRCH;
9193 	goto out;
9194 
9195 do_error:
9196 	err = -EPIPE;
9197 	goto out;
9198 
9199 do_interrupted:
9200 	err = sock_intr_errno(*timeo_p);
9201 	goto out;
9202 
9203 do_nonblock:
9204 	err = -EAGAIN;
9205 	goto out;
9206 }
9207 
9208 void sctp_data_ready(struct sock *sk)
9209 {
9210 	struct socket_wq *wq;
9211 
9212 	rcu_read_lock();
9213 	wq = rcu_dereference(sk->sk_wq);
9214 	if (skwq_has_sleeper(wq))
9215 		wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
9216 						EPOLLRDNORM | EPOLLRDBAND);
9217 	sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
9218 	rcu_read_unlock();
9219 }
9220 
9221 /* If socket sndbuf has changed, wake up all per association waiters.  */
9222 void sctp_write_space(struct sock *sk)
9223 {
9224 	struct sctp_association *asoc;
9225 
9226 	/* Wake up the tasks in each wait queue.  */
9227 	list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
9228 		__sctp_write_space(asoc);
9229 	}
9230 }
9231 
9232 /* Is there any sndbuf space available on the socket?
9233  *
9234  * Note that sk_wmem_alloc is the sum of the send buffers on all of the
9235  * associations on the same socket.  For a UDP-style socket with
9236  * multiple associations, it is possible for it to be "unwriteable"
9237  * prematurely.  I assume that this is acceptable because
9238  * a premature "unwriteable" is better than an accidental "writeable" which
9239  * would cause an unwanted block under certain circumstances.  For the 1-1
9240  * UDP-style sockets or TCP-style sockets, this code should work.
9241  *  - Daisy
9242  */
9243 static bool sctp_writeable(struct sock *sk)
9244 {
9245 	return sk->sk_sndbuf > sk->sk_wmem_queued;
9246 }
9247 
9248 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
9249  * returns immediately with EINPROGRESS.
9250  */
9251 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
9252 {
9253 	struct sock *sk = asoc->base.sk;
9254 	int err = 0;
9255 	long current_timeo = *timeo_p;
9256 	DEFINE_WAIT(wait);
9257 
9258 	pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
9259 
9260 	/* Increment the association's refcnt.  */
9261 	sctp_association_hold(asoc);
9262 
9263 	for (;;) {
9264 		prepare_to_wait_exclusive(&asoc->wait, &wait,
9265 					  TASK_INTERRUPTIBLE);
9266 		if (!*timeo_p)
9267 			goto do_nonblock;
9268 		if (sk->sk_shutdown & RCV_SHUTDOWN)
9269 			break;
9270 		if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
9271 		    asoc->base.dead)
9272 			goto do_error;
9273 		if (signal_pending(current))
9274 			goto do_interrupted;
9275 
9276 		if (sctp_state(asoc, ESTABLISHED))
9277 			break;
9278 
9279 		/* Let another process have a go.  Since we are going
9280 		 * to sleep anyway.
9281 		 */
9282 		release_sock(sk);
9283 		current_timeo = schedule_timeout(current_timeo);
9284 		lock_sock(sk);
9285 
9286 		*timeo_p = current_timeo;
9287 	}
9288 
9289 out:
9290 	finish_wait(&asoc->wait, &wait);
9291 
9292 	/* Release the association's refcnt.  */
9293 	sctp_association_put(asoc);
9294 
9295 	return err;
9296 
9297 do_error:
9298 	if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
9299 		err = -ETIMEDOUT;
9300 	else
9301 		err = -ECONNREFUSED;
9302 	goto out;
9303 
9304 do_interrupted:
9305 	err = sock_intr_errno(*timeo_p);
9306 	goto out;
9307 
9308 do_nonblock:
9309 	err = -EINPROGRESS;
9310 	goto out;
9311 }
9312 
9313 static int sctp_wait_for_accept(struct sock *sk, long timeo)
9314 {
9315 	struct sctp_endpoint *ep;
9316 	int err = 0;
9317 	DEFINE_WAIT(wait);
9318 
9319 	ep = sctp_sk(sk)->ep;
9320 
9321 
9322 	for (;;) {
9323 		prepare_to_wait_exclusive(sk_sleep(sk), &wait,
9324 					  TASK_INTERRUPTIBLE);
9325 
9326 		if (list_empty(&ep->asocs)) {
9327 			release_sock(sk);
9328 			timeo = schedule_timeout(timeo);
9329 			lock_sock(sk);
9330 		}
9331 
9332 		err = -EINVAL;
9333 		if (!sctp_sstate(sk, LISTENING))
9334 			break;
9335 
9336 		err = 0;
9337 		if (!list_empty(&ep->asocs))
9338 			break;
9339 
9340 		err = sock_intr_errno(timeo);
9341 		if (signal_pending(current))
9342 			break;
9343 
9344 		err = -EAGAIN;
9345 		if (!timeo)
9346 			break;
9347 	}
9348 
9349 	finish_wait(sk_sleep(sk), &wait);
9350 
9351 	return err;
9352 }
9353 
9354 static void sctp_wait_for_close(struct sock *sk, long timeout)
9355 {
9356 	DEFINE_WAIT(wait);
9357 
9358 	do {
9359 		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
9360 		if (list_empty(&sctp_sk(sk)->ep->asocs))
9361 			break;
9362 		release_sock(sk);
9363 		timeout = schedule_timeout(timeout);
9364 		lock_sock(sk);
9365 	} while (!signal_pending(current) && timeout);
9366 
9367 	finish_wait(sk_sleep(sk), &wait);
9368 }
9369 
9370 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
9371 {
9372 	struct sk_buff *frag;
9373 
9374 	if (!skb->data_len)
9375 		goto done;
9376 
9377 	/* Don't forget the fragments. */
9378 	skb_walk_frags(skb, frag)
9379 		sctp_skb_set_owner_r_frag(frag, sk);
9380 
9381 done:
9382 	sctp_skb_set_owner_r(skb, sk);
9383 }
9384 
9385 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
9386 		    struct sctp_association *asoc)
9387 {
9388 	struct inet_sock *inet = inet_sk(sk);
9389 	struct inet_sock *newinet;
9390 	struct sctp_sock *sp = sctp_sk(sk);
9391 	struct sctp_endpoint *ep = sp->ep;
9392 
9393 	newsk->sk_type = sk->sk_type;
9394 	newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
9395 	newsk->sk_flags = sk->sk_flags;
9396 	newsk->sk_tsflags = sk->sk_tsflags;
9397 	newsk->sk_no_check_tx = sk->sk_no_check_tx;
9398 	newsk->sk_no_check_rx = sk->sk_no_check_rx;
9399 	newsk->sk_reuse = sk->sk_reuse;
9400 	sctp_sk(newsk)->reuse = sp->reuse;
9401 
9402 	newsk->sk_shutdown = sk->sk_shutdown;
9403 	newsk->sk_destruct = sctp_destruct_sock;
9404 	newsk->sk_family = sk->sk_family;
9405 	newsk->sk_protocol = IPPROTO_SCTP;
9406 	newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
9407 	newsk->sk_sndbuf = sk->sk_sndbuf;
9408 	newsk->sk_rcvbuf = sk->sk_rcvbuf;
9409 	newsk->sk_lingertime = sk->sk_lingertime;
9410 	newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
9411 	newsk->sk_sndtimeo = sk->sk_sndtimeo;
9412 	newsk->sk_rxhash = sk->sk_rxhash;
9413 
9414 	newinet = inet_sk(newsk);
9415 
9416 	/* Initialize sk's sport, dport, rcv_saddr and daddr for
9417 	 * getsockname() and getpeername()
9418 	 */
9419 	newinet->inet_sport = inet->inet_sport;
9420 	newinet->inet_saddr = inet->inet_saddr;
9421 	newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
9422 	newinet->inet_dport = htons(asoc->peer.port);
9423 	newinet->pmtudisc = inet->pmtudisc;
9424 	newinet->inet_id = prandom_u32();
9425 
9426 	newinet->uc_ttl = inet->uc_ttl;
9427 	newinet->mc_loop = 1;
9428 	newinet->mc_ttl = 1;
9429 	newinet->mc_index = 0;
9430 	newinet->mc_list = NULL;
9431 
9432 	if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
9433 		net_enable_timestamp();
9434 
9435 	/* Set newsk security attributes from orginal sk and connection
9436 	 * security attribute from ep.
9437 	 */
9438 	security_sctp_sk_clone(ep, sk, newsk);
9439 }
9440 
9441 static inline void sctp_copy_descendant(struct sock *sk_to,
9442 					const struct sock *sk_from)
9443 {
9444 	int ancestor_size = sizeof(struct inet_sock) +
9445 			    sizeof(struct sctp_sock) -
9446 			    offsetof(struct sctp_sock, pd_lobby);
9447 
9448 	if (sk_from->sk_family == PF_INET6)
9449 		ancestor_size += sizeof(struct ipv6_pinfo);
9450 
9451 	__inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
9452 }
9453 
9454 /* Populate the fields of the newsk from the oldsk and migrate the assoc
9455  * and its messages to the newsk.
9456  */
9457 static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
9458 			     struct sctp_association *assoc,
9459 			     enum sctp_socket_type type)
9460 {
9461 	struct sctp_sock *oldsp = sctp_sk(oldsk);
9462 	struct sctp_sock *newsp = sctp_sk(newsk);
9463 	struct sctp_bind_bucket *pp; /* hash list port iterator */
9464 	struct sctp_endpoint *newep = newsp->ep;
9465 	struct sk_buff *skb, *tmp;
9466 	struct sctp_ulpevent *event;
9467 	struct sctp_bind_hashbucket *head;
9468 	int err;
9469 
9470 	/* Migrate socket buffer sizes and all the socket level options to the
9471 	 * new socket.
9472 	 */
9473 	newsk->sk_sndbuf = oldsk->sk_sndbuf;
9474 	newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
9475 	/* Brute force copy old sctp opt. */
9476 	sctp_copy_descendant(newsk, oldsk);
9477 
9478 	/* Restore the ep value that was overwritten with the above structure
9479 	 * copy.
9480 	 */
9481 	newsp->ep = newep;
9482 	newsp->hmac = NULL;
9483 
9484 	/* Hook this new socket in to the bind_hash list. */
9485 	head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
9486 						 inet_sk(oldsk)->inet_num)];
9487 	spin_lock_bh(&head->lock);
9488 	pp = sctp_sk(oldsk)->bind_hash;
9489 	sk_add_bind_node(newsk, &pp->owner);
9490 	sctp_sk(newsk)->bind_hash = pp;
9491 	inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
9492 	spin_unlock_bh(&head->lock);
9493 
9494 	/* Copy the bind_addr list from the original endpoint to the new
9495 	 * endpoint so that we can handle restarts properly
9496 	 */
9497 	err = sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
9498 				 &oldsp->ep->base.bind_addr, GFP_KERNEL);
9499 	if (err)
9500 		return err;
9501 
9502 	/* New ep's auth_hmacs should be set if old ep's is set, in case
9503 	 * that net->sctp.auth_enable has been changed to 0 by users and
9504 	 * new ep's auth_hmacs couldn't be set in sctp_endpoint_init().
9505 	 */
9506 	if (oldsp->ep->auth_hmacs) {
9507 		err = sctp_auth_init_hmacs(newsp->ep, GFP_KERNEL);
9508 		if (err)
9509 			return err;
9510 	}
9511 
9512 	/* Move any messages in the old socket's receive queue that are for the
9513 	 * peeled off association to the new socket's receive queue.
9514 	 */
9515 	sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
9516 		event = sctp_skb2event(skb);
9517 		if (event->asoc == assoc) {
9518 			__skb_unlink(skb, &oldsk->sk_receive_queue);
9519 			__skb_queue_tail(&newsk->sk_receive_queue, skb);
9520 			sctp_skb_set_owner_r_frag(skb, newsk);
9521 		}
9522 	}
9523 
9524 	/* Clean up any messages pending delivery due to partial
9525 	 * delivery.   Three cases:
9526 	 * 1) No partial deliver;  no work.
9527 	 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
9528 	 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
9529 	 */
9530 	atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
9531 
9532 	if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
9533 		struct sk_buff_head *queue;
9534 
9535 		/* Decide which queue to move pd_lobby skbs to. */
9536 		if (assoc->ulpq.pd_mode) {
9537 			queue = &newsp->pd_lobby;
9538 		} else
9539 			queue = &newsk->sk_receive_queue;
9540 
9541 		/* Walk through the pd_lobby, looking for skbs that
9542 		 * need moved to the new socket.
9543 		 */
9544 		sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
9545 			event = sctp_skb2event(skb);
9546 			if (event->asoc == assoc) {
9547 				__skb_unlink(skb, &oldsp->pd_lobby);
9548 				__skb_queue_tail(queue, skb);
9549 				sctp_skb_set_owner_r_frag(skb, newsk);
9550 			}
9551 		}
9552 
9553 		/* Clear up any skbs waiting for the partial
9554 		 * delivery to finish.
9555 		 */
9556 		if (assoc->ulpq.pd_mode)
9557 			sctp_clear_pd(oldsk, NULL);
9558 
9559 	}
9560 
9561 	sctp_for_each_rx_skb(assoc, newsk, sctp_skb_set_owner_r_frag);
9562 
9563 	/* Set the type of socket to indicate that it is peeled off from the
9564 	 * original UDP-style socket or created with the accept() call on a
9565 	 * TCP-style socket..
9566 	 */
9567 	newsp->type = type;
9568 
9569 	/* Mark the new socket "in-use" by the user so that any packets
9570 	 * that may arrive on the association after we've moved it are
9571 	 * queued to the backlog.  This prevents a potential race between
9572 	 * backlog processing on the old socket and new-packet processing
9573 	 * on the new socket.
9574 	 *
9575 	 * The caller has just allocated newsk so we can guarantee that other
9576 	 * paths won't try to lock it and then oldsk.
9577 	 */
9578 	lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
9579 	sctp_for_each_tx_datachunk(assoc, sctp_clear_owner_w);
9580 	sctp_assoc_migrate(assoc, newsk);
9581 	sctp_for_each_tx_datachunk(assoc, sctp_set_owner_w);
9582 
9583 	/* If the association on the newsk is already closed before accept()
9584 	 * is called, set RCV_SHUTDOWN flag.
9585 	 */
9586 	if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
9587 		inet_sk_set_state(newsk, SCTP_SS_CLOSED);
9588 		newsk->sk_shutdown |= RCV_SHUTDOWN;
9589 	} else {
9590 		inet_sk_set_state(newsk, SCTP_SS_ESTABLISHED);
9591 	}
9592 
9593 	release_sock(newsk);
9594 
9595 	return 0;
9596 }
9597 
9598 
9599 /* This proto struct describes the ULP interface for SCTP.  */
9600 struct proto sctp_prot = {
9601 	.name        =	"SCTP",
9602 	.owner       =	THIS_MODULE,
9603 	.close       =	sctp_close,
9604 	.disconnect  =	sctp_disconnect,
9605 	.accept      =	sctp_accept,
9606 	.ioctl       =	sctp_ioctl,
9607 	.init        =	sctp_init_sock,
9608 	.destroy     =	sctp_destroy_sock,
9609 	.shutdown    =	sctp_shutdown,
9610 	.setsockopt  =	sctp_setsockopt,
9611 	.getsockopt  =	sctp_getsockopt,
9612 	.sendmsg     =	sctp_sendmsg,
9613 	.recvmsg     =	sctp_recvmsg,
9614 	.bind        =	sctp_bind,
9615 	.backlog_rcv =	sctp_backlog_rcv,
9616 	.hash        =	sctp_hash,
9617 	.unhash      =	sctp_unhash,
9618 	.no_autobind =	true,
9619 	.obj_size    =  sizeof(struct sctp_sock),
9620 	.useroffset  =  offsetof(struct sctp_sock, subscribe),
9621 	.usersize    =  offsetof(struct sctp_sock, initmsg) -
9622 				offsetof(struct sctp_sock, subscribe) +
9623 				sizeof_field(struct sctp_sock, initmsg),
9624 	.sysctl_mem  =  sysctl_sctp_mem,
9625 	.sysctl_rmem =  sysctl_sctp_rmem,
9626 	.sysctl_wmem =  sysctl_sctp_wmem,
9627 	.memory_pressure = &sctp_memory_pressure,
9628 	.enter_memory_pressure = sctp_enter_memory_pressure,
9629 	.memory_allocated = &sctp_memory_allocated,
9630 	.sockets_allocated = &sctp_sockets_allocated,
9631 };
9632 
9633 #if IS_ENABLED(CONFIG_IPV6)
9634 
9635 #include <net/transp_v6.h>
9636 static void sctp_v6_destroy_sock(struct sock *sk)
9637 {
9638 	sctp_destroy_sock(sk);
9639 	inet6_destroy_sock(sk);
9640 }
9641 
9642 struct proto sctpv6_prot = {
9643 	.name		= "SCTPv6",
9644 	.owner		= THIS_MODULE,
9645 	.close		= sctp_close,
9646 	.disconnect	= sctp_disconnect,
9647 	.accept		= sctp_accept,
9648 	.ioctl		= sctp_ioctl,
9649 	.init		= sctp_init_sock,
9650 	.destroy	= sctp_v6_destroy_sock,
9651 	.shutdown	= sctp_shutdown,
9652 	.setsockopt	= sctp_setsockopt,
9653 	.getsockopt	= sctp_getsockopt,
9654 	.sendmsg	= sctp_sendmsg,
9655 	.recvmsg	= sctp_recvmsg,
9656 	.bind		= sctp_bind,
9657 	.backlog_rcv	= sctp_backlog_rcv,
9658 	.hash		= sctp_hash,
9659 	.unhash		= sctp_unhash,
9660 	.no_autobind	= true,
9661 	.obj_size	= sizeof(struct sctp6_sock),
9662 	.useroffset	= offsetof(struct sctp6_sock, sctp.subscribe),
9663 	.usersize	= offsetof(struct sctp6_sock, sctp.initmsg) -
9664 				offsetof(struct sctp6_sock, sctp.subscribe) +
9665 				sizeof_field(struct sctp6_sock, sctp.initmsg),
9666 	.sysctl_mem	= sysctl_sctp_mem,
9667 	.sysctl_rmem	= sysctl_sctp_rmem,
9668 	.sysctl_wmem	= sysctl_sctp_wmem,
9669 	.memory_pressure = &sctp_memory_pressure,
9670 	.enter_memory_pressure = sctp_enter_memory_pressure,
9671 	.memory_allocated = &sctp_memory_allocated,
9672 	.sockets_allocated = &sctp_sockets_allocated,
9673 };
9674 #endif /* IS_ENABLED(CONFIG_IPV6) */
9675