1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * UDP over IPv6
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 *
9 * Based on linux/ipv4/udp.c
10 *
11 * Fixes:
12 * Hideaki YOSHIFUJI : sin6_scope_id support
13 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
14 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
15 * a single port at the same time.
16 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
17 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
18 */
19
20 #include <linux/bpf-cgroup.h>
21 #include <linux/errno.h>
22 #include <linux/types.h>
23 #include <linux/socket.h>
24 #include <linux/sockios.h>
25 #include <linux/net.h>
26 #include <linux/in6.h>
27 #include <linux/netdevice.h>
28 #include <linux/if_arp.h>
29 #include <linux/ipv6.h>
30 #include <linux/icmpv6.h>
31 #include <linux/init.h>
32 #include <linux/module.h>
33 #include <linux/skbuff.h>
34 #include <linux/slab.h>
35 #include <linux/uaccess.h>
36 #include <linux/indirect_call_wrapper.h>
37
38 #include <net/addrconf.h>
39 #include <net/ndisc.h>
40 #include <net/protocol.h>
41 #include <net/transp_v6.h>
42 #include <net/ip6_route.h>
43 #include <net/raw.h>
44 #include <net/seg6.h>
45 #include <net/tcp_states.h>
46 #include <net/ip6_checksum.h>
47 #include <net/ip6_tunnel.h>
48 #include <trace/events/udp.h>
49 #include <net/xfrm.h>
50 #include <net/inet_hashtables.h>
51 #include <net/inet6_hashtables.h>
52 #include <net/busy_poll.h>
53 #include <net/sock_reuseport.h>
54 #include <net/gro.h>
55
56 #include <linux/proc_fs.h>
57 #include <linux/seq_file.h>
58 #include <trace/events/skb.h>
59 #include "udp_impl.h"
60
udpv6_destruct_sock(struct sock * sk)61 static void udpv6_destruct_sock(struct sock *sk)
62 {
63 udp_destruct_common(sk);
64 inet6_sock_destruct(sk);
65 }
66
udpv6_init_sock(struct sock * sk)67 int udpv6_init_sock(struct sock *sk)
68 {
69 udp_lib_init_sock(sk);
70 sk->sk_destruct = udpv6_destruct_sock;
71 set_bit(SOCK_SUPPORT_ZC, &sk->sk_socket->flags);
72 return 0;
73 }
74
75 INDIRECT_CALLABLE_SCOPE
udp6_ehashfn(const struct net * net,const struct in6_addr * laddr,const u16 lport,const struct in6_addr * faddr,const __be16 fport)76 u32 udp6_ehashfn(const struct net *net,
77 const struct in6_addr *laddr,
78 const u16 lport,
79 const struct in6_addr *faddr,
80 const __be16 fport)
81 {
82 static u32 udp6_ehash_secret __read_mostly;
83 static u32 udp_ipv6_hash_secret __read_mostly;
84
85 u32 lhash, fhash;
86
87 net_get_random_once(&udp6_ehash_secret,
88 sizeof(udp6_ehash_secret));
89 net_get_random_once(&udp_ipv6_hash_secret,
90 sizeof(udp_ipv6_hash_secret));
91
92 lhash = (__force u32)laddr->s6_addr32[3];
93 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
94
95 return __inet6_ehashfn(lhash, lport, fhash, fport,
96 udp6_ehash_secret + net_hash_mix(net));
97 }
98
udp_v6_get_port(struct sock * sk,unsigned short snum)99 int udp_v6_get_port(struct sock *sk, unsigned short snum)
100 {
101 unsigned int hash2_nulladdr =
102 ipv6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
103 unsigned int hash2_partial =
104 ipv6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
105
106 /* precompute partial secondary hash */
107 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
108 return udp_lib_get_port(sk, snum, hash2_nulladdr);
109 }
110
udp_v6_rehash(struct sock * sk)111 void udp_v6_rehash(struct sock *sk)
112 {
113 u16 new_hash = ipv6_portaddr_hash(sock_net(sk),
114 &sk->sk_v6_rcv_saddr,
115 inet_sk(sk)->inet_num);
116
117 udp_lib_rehash(sk, new_hash);
118 }
119
compute_score(struct sock * sk,struct net * net,const struct in6_addr * saddr,__be16 sport,const struct in6_addr * daddr,unsigned short hnum,int dif,int sdif)120 static int compute_score(struct sock *sk, struct net *net,
121 const struct in6_addr *saddr, __be16 sport,
122 const struct in6_addr *daddr, unsigned short hnum,
123 int dif, int sdif)
124 {
125 int bound_dev_if, score;
126 struct inet_sock *inet;
127 bool dev_match;
128
129 if (!net_eq(sock_net(sk), net) ||
130 udp_sk(sk)->udp_port_hash != hnum ||
131 sk->sk_family != PF_INET6)
132 return -1;
133
134 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
135 return -1;
136
137 score = 0;
138 inet = inet_sk(sk);
139
140 if (inet->inet_dport) {
141 if (inet->inet_dport != sport)
142 return -1;
143 score++;
144 }
145
146 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
147 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
148 return -1;
149 score++;
150 }
151
152 bound_dev_if = READ_ONCE(sk->sk_bound_dev_if);
153 dev_match = udp_sk_bound_dev_eq(net, bound_dev_if, dif, sdif);
154 if (!dev_match)
155 return -1;
156 if (bound_dev_if)
157 score++;
158
159 if (READ_ONCE(sk->sk_incoming_cpu) == raw_smp_processor_id())
160 score++;
161
162 return score;
163 }
164
165 /* called with rcu_read_lock() */
udp6_lib_lookup2(struct net * net,const struct in6_addr * saddr,__be16 sport,const struct in6_addr * daddr,unsigned int hnum,int dif,int sdif,struct udp_hslot * hslot2,struct sk_buff * skb)166 static struct sock *udp6_lib_lookup2(struct net *net,
167 const struct in6_addr *saddr, __be16 sport,
168 const struct in6_addr *daddr, unsigned int hnum,
169 int dif, int sdif, struct udp_hslot *hslot2,
170 struct sk_buff *skb)
171 {
172 struct sock *sk, *result;
173 int score, badness;
174
175 result = NULL;
176 badness = -1;
177 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
178 score = compute_score(sk, net, saddr, sport,
179 daddr, hnum, dif, sdif);
180 if (score > badness) {
181 badness = score;
182
183 if (sk->sk_state == TCP_ESTABLISHED) {
184 result = sk;
185 continue;
186 }
187
188 result = inet6_lookup_reuseport(net, sk, skb, sizeof(struct udphdr),
189 saddr, sport, daddr, hnum, udp6_ehashfn);
190 if (!result) {
191 result = sk;
192 continue;
193 }
194
195 /* Fall back to scoring if group has connections */
196 if (!reuseport_has_conns(sk))
197 return result;
198
199 /* Reuseport logic returned an error, keep original score. */
200 if (IS_ERR(result))
201 continue;
202
203 badness = compute_score(sk, net, saddr, sport,
204 daddr, hnum, dif, sdif);
205 }
206 }
207 return result;
208 }
209
210 /* rcu_read_lock() must be held */
__udp6_lib_lookup(struct net * net,const struct in6_addr * saddr,__be16 sport,const struct in6_addr * daddr,__be16 dport,int dif,int sdif,struct udp_table * udptable,struct sk_buff * skb)211 struct sock *__udp6_lib_lookup(struct net *net,
212 const struct in6_addr *saddr, __be16 sport,
213 const struct in6_addr *daddr, __be16 dport,
214 int dif, int sdif, struct udp_table *udptable,
215 struct sk_buff *skb)
216 {
217 unsigned short hnum = ntohs(dport);
218 unsigned int hash2, slot2;
219 struct udp_hslot *hslot2;
220 struct sock *result, *sk;
221
222 hash2 = ipv6_portaddr_hash(net, daddr, hnum);
223 slot2 = hash2 & udptable->mask;
224 hslot2 = &udptable->hash2[slot2];
225
226 /* Lookup connected or non-wildcard sockets */
227 result = udp6_lib_lookup2(net, saddr, sport,
228 daddr, hnum, dif, sdif,
229 hslot2, skb);
230 if (!IS_ERR_OR_NULL(result) && result->sk_state == TCP_ESTABLISHED)
231 goto done;
232
233 /* Lookup redirect from BPF */
234 if (static_branch_unlikely(&bpf_sk_lookup_enabled) &&
235 udptable == net->ipv4.udp_table) {
236 sk = inet6_lookup_run_sk_lookup(net, IPPROTO_UDP, skb, sizeof(struct udphdr),
237 saddr, sport, daddr, hnum, dif,
238 udp6_ehashfn);
239 if (sk) {
240 result = sk;
241 goto done;
242 }
243 }
244
245 /* Got non-wildcard socket or error on first lookup */
246 if (result)
247 goto done;
248
249 /* Lookup wildcard sockets */
250 hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum);
251 slot2 = hash2 & udptable->mask;
252 hslot2 = &udptable->hash2[slot2];
253
254 result = udp6_lib_lookup2(net, saddr, sport,
255 &in6addr_any, hnum, dif, sdif,
256 hslot2, skb);
257 done:
258 if (IS_ERR(result))
259 return NULL;
260 return result;
261 }
262 EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
263
__udp6_lib_lookup_skb(struct sk_buff * skb,__be16 sport,__be16 dport,struct udp_table * udptable)264 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
265 __be16 sport, __be16 dport,
266 struct udp_table *udptable)
267 {
268 const struct ipv6hdr *iph = ipv6_hdr(skb);
269
270 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
271 &iph->daddr, dport, inet6_iif(skb),
272 inet6_sdif(skb), udptable, skb);
273 }
274
udp6_lib_lookup_skb(const struct sk_buff * skb,__be16 sport,__be16 dport)275 struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb,
276 __be16 sport, __be16 dport)
277 {
278 const u16 offset = NAPI_GRO_CB(skb)->network_offsets[skb->encapsulation];
279 const struct ipv6hdr *iph = (struct ipv6hdr *)(skb->data + offset);
280 struct net *net = dev_net(skb->dev);
281 int iif, sdif;
282
283 inet6_get_iif_sdif(skb, &iif, &sdif);
284
285 return __udp6_lib_lookup(net, &iph->saddr, sport,
286 &iph->daddr, dport, iif,
287 sdif, net->ipv4.udp_table, NULL);
288 }
289
290 /* Must be called under rcu_read_lock().
291 * Does increment socket refcount.
292 */
293 #if IS_ENABLED(CONFIG_NF_TPROXY_IPV6) || IS_ENABLED(CONFIG_NF_SOCKET_IPV6)
udp6_lib_lookup(struct net * net,const struct in6_addr * saddr,__be16 sport,const struct in6_addr * daddr,__be16 dport,int dif)294 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
295 const struct in6_addr *daddr, __be16 dport, int dif)
296 {
297 struct sock *sk;
298
299 sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport,
300 dif, 0, net->ipv4.udp_table, NULL);
301 if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
302 sk = NULL;
303 return sk;
304 }
305 EXPORT_SYMBOL_GPL(udp6_lib_lookup);
306 #endif
307
308 /* do not use the scratch area len for jumbogram: their length execeeds the
309 * scratch area space; note that the IP6CB flags is still in the first
310 * cacheline, so checking for jumbograms is cheap
311 */
udp6_skb_len(struct sk_buff * skb)312 static int udp6_skb_len(struct sk_buff *skb)
313 {
314 return unlikely(inet6_is_jumbogram(skb)) ? skb->len : udp_skb_len(skb);
315 }
316
317 /*
318 * This should be easy, if there is something there we
319 * return it, otherwise we block.
320 */
321
udpv6_recvmsg(struct sock * sk,struct msghdr * msg,size_t len,int flags,int * addr_len)322 int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
323 int flags, int *addr_len)
324 {
325 struct ipv6_pinfo *np = inet6_sk(sk);
326 struct inet_sock *inet = inet_sk(sk);
327 struct sk_buff *skb;
328 unsigned int ulen, copied;
329 int off, err, peeking = flags & MSG_PEEK;
330 int is_udplite = IS_UDPLITE(sk);
331 struct udp_mib __percpu *mib;
332 bool checksum_valid = false;
333 int is_udp4;
334
335 if (flags & MSG_ERRQUEUE)
336 return ipv6_recv_error(sk, msg, len, addr_len);
337
338 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
339 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
340
341 try_again:
342 off = sk_peek_offset(sk, flags);
343 skb = __skb_recv_udp(sk, flags, &off, &err);
344 if (!skb)
345 return err;
346
347 ulen = udp6_skb_len(skb);
348 copied = len;
349 if (copied > ulen - off)
350 copied = ulen - off;
351 else if (copied < ulen)
352 msg->msg_flags |= MSG_TRUNC;
353
354 is_udp4 = (skb->protocol == htons(ETH_P_IP));
355 mib = __UDPX_MIB(sk, is_udp4);
356
357 /*
358 * If checksum is needed at all, try to do it while copying the
359 * data. If the data is truncated, or if we only want a partial
360 * coverage checksum (UDP-Lite), do it before the copy.
361 */
362
363 if (copied < ulen || peeking ||
364 (is_udplite && UDP_SKB_CB(skb)->partial_cov)) {
365 checksum_valid = udp_skb_csum_unnecessary(skb) ||
366 !__udp_lib_checksum_complete(skb);
367 if (!checksum_valid)
368 goto csum_copy_err;
369 }
370
371 if (checksum_valid || udp_skb_csum_unnecessary(skb)) {
372 if (udp_skb_is_linear(skb))
373 err = copy_linear_skb(skb, copied, off, &msg->msg_iter);
374 else
375 err = skb_copy_datagram_msg(skb, off, msg, copied);
376 } else {
377 err = skb_copy_and_csum_datagram_msg(skb, off, msg);
378 if (err == -EINVAL)
379 goto csum_copy_err;
380 }
381 if (unlikely(err)) {
382 if (!peeking) {
383 atomic_inc(&sk->sk_drops);
384 SNMP_INC_STATS(mib, UDP_MIB_INERRORS);
385 }
386 kfree_skb(skb);
387 return err;
388 }
389 if (!peeking)
390 SNMP_INC_STATS(mib, UDP_MIB_INDATAGRAMS);
391
392 sock_recv_cmsgs(msg, sk, skb);
393
394 /* Copy the address. */
395 if (msg->msg_name) {
396 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
397 sin6->sin6_family = AF_INET6;
398 sin6->sin6_port = udp_hdr(skb)->source;
399 sin6->sin6_flowinfo = 0;
400
401 if (is_udp4) {
402 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
403 &sin6->sin6_addr);
404 sin6->sin6_scope_id = 0;
405 } else {
406 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
407 sin6->sin6_scope_id =
408 ipv6_iface_scope_id(&sin6->sin6_addr,
409 inet6_iif(skb));
410 }
411 *addr_len = sizeof(*sin6);
412
413 BPF_CGROUP_RUN_PROG_UDP6_RECVMSG_LOCK(sk,
414 (struct sockaddr *)sin6,
415 addr_len);
416 }
417
418 if (udp_test_bit(GRO_ENABLED, sk))
419 udp_cmsg_recv(msg, sk, skb);
420
421 if (np->rxopt.all)
422 ip6_datagram_recv_common_ctl(sk, msg, skb);
423
424 if (is_udp4) {
425 if (inet_cmsg_flags(inet))
426 ip_cmsg_recv_offset(msg, sk, skb,
427 sizeof(struct udphdr), off);
428 } else {
429 if (np->rxopt.all)
430 ip6_datagram_recv_specific_ctl(sk, msg, skb);
431 }
432
433 err = copied;
434 if (flags & MSG_TRUNC)
435 err = ulen;
436
437 skb_consume_udp(sk, skb, peeking ? -err : err);
438 return err;
439
440 csum_copy_err:
441 if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags,
442 udp_skb_destructor)) {
443 SNMP_INC_STATS(mib, UDP_MIB_CSUMERRORS);
444 SNMP_INC_STATS(mib, UDP_MIB_INERRORS);
445 }
446 kfree_skb(skb);
447
448 /* starting over for a new packet, but check if we need to yield */
449 cond_resched();
450 msg->msg_flags &= ~MSG_TRUNC;
451 goto try_again;
452 }
453
454 DECLARE_STATIC_KEY_FALSE(udpv6_encap_needed_key);
udpv6_encap_enable(void)455 void udpv6_encap_enable(void)
456 {
457 static_branch_inc(&udpv6_encap_needed_key);
458 }
459 EXPORT_SYMBOL(udpv6_encap_enable);
460
461 /* Handler for tunnels with arbitrary destination ports: no socket lookup, go
462 * through error handlers in encapsulations looking for a match.
463 */
__udp6_lib_err_encap_no_sk(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)464 static int __udp6_lib_err_encap_no_sk(struct sk_buff *skb,
465 struct inet6_skb_parm *opt,
466 u8 type, u8 code, int offset, __be32 info)
467 {
468 int i;
469
470 for (i = 0; i < MAX_IPTUN_ENCAP_OPS; i++) {
471 int (*handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
472 u8 type, u8 code, int offset, __be32 info);
473 const struct ip6_tnl_encap_ops *encap;
474
475 encap = rcu_dereference(ip6tun_encaps[i]);
476 if (!encap)
477 continue;
478 handler = encap->err_handler;
479 if (handler && !handler(skb, opt, type, code, offset, info))
480 return 0;
481 }
482
483 return -ENOENT;
484 }
485
486 /* Try to match ICMP errors to UDP tunnels by looking up a socket without
487 * reversing source and destination port: this will match tunnels that force the
488 * same destination port on both endpoints (e.g. VXLAN, GENEVE). Note that
489 * lwtunnels might actually break this assumption by being configured with
490 * different destination ports on endpoints, in this case we won't be able to
491 * trace ICMP messages back to them.
492 *
493 * If this doesn't match any socket, probe tunnels with arbitrary destination
494 * ports (e.g. FoU, GUE): there, the receiving socket is useless, as the port
495 * we've sent packets to won't necessarily match the local destination port.
496 *
497 * Then ask the tunnel implementation to match the error against a valid
498 * association.
499 *
500 * Return an error if we can't find a match, the socket if we need further
501 * processing, zero otherwise.
502 */
__udp6_lib_err_encap(struct net * net,const struct ipv6hdr * hdr,int offset,struct udphdr * uh,struct udp_table * udptable,struct sock * sk,struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,__be32 info)503 static struct sock *__udp6_lib_err_encap(struct net *net,
504 const struct ipv6hdr *hdr, int offset,
505 struct udphdr *uh,
506 struct udp_table *udptable,
507 struct sock *sk,
508 struct sk_buff *skb,
509 struct inet6_skb_parm *opt,
510 u8 type, u8 code, __be32 info)
511 {
512 int (*lookup)(struct sock *sk, struct sk_buff *skb);
513 int network_offset, transport_offset;
514 struct udp_sock *up;
515
516 network_offset = skb_network_offset(skb);
517 transport_offset = skb_transport_offset(skb);
518
519 /* Network header needs to point to the outer IPv6 header inside ICMP */
520 skb_reset_network_header(skb);
521
522 /* Transport header needs to point to the UDP header */
523 skb_set_transport_header(skb, offset);
524
525 if (sk) {
526 up = udp_sk(sk);
527
528 lookup = READ_ONCE(up->encap_err_lookup);
529 if (lookup && lookup(sk, skb))
530 sk = NULL;
531
532 goto out;
533 }
534
535 sk = __udp6_lib_lookup(net, &hdr->daddr, uh->source,
536 &hdr->saddr, uh->dest,
537 inet6_iif(skb), 0, udptable, skb);
538 if (sk) {
539 up = udp_sk(sk);
540
541 lookup = READ_ONCE(up->encap_err_lookup);
542 if (!lookup || lookup(sk, skb))
543 sk = NULL;
544 }
545
546 out:
547 if (!sk) {
548 sk = ERR_PTR(__udp6_lib_err_encap_no_sk(skb, opt, type, code,
549 offset, info));
550 }
551
552 skb_set_transport_header(skb, transport_offset);
553 skb_set_network_header(skb, network_offset);
554
555 return sk;
556 }
557
__udp6_lib_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info,struct udp_table * udptable)558 int __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
559 u8 type, u8 code, int offset, __be32 info,
560 struct udp_table *udptable)
561 {
562 struct ipv6_pinfo *np;
563 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
564 const struct in6_addr *saddr = &hdr->saddr;
565 const struct in6_addr *daddr = seg6_get_daddr(skb, opt) ? : &hdr->daddr;
566 struct udphdr *uh = (struct udphdr *)(skb->data+offset);
567 bool tunnel = false;
568 struct sock *sk;
569 int harderr;
570 int err;
571 struct net *net = dev_net(skb->dev);
572
573 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
574 inet6_iif(skb), inet6_sdif(skb), udptable, NULL);
575
576 if (!sk || READ_ONCE(udp_sk(sk)->encap_type)) {
577 /* No socket for error: try tunnels before discarding */
578 if (static_branch_unlikely(&udpv6_encap_needed_key)) {
579 sk = __udp6_lib_err_encap(net, hdr, offset, uh,
580 udptable, sk, skb,
581 opt, type, code, info);
582 if (!sk)
583 return 0;
584 } else
585 sk = ERR_PTR(-ENOENT);
586
587 if (IS_ERR(sk)) {
588 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
589 ICMP6_MIB_INERRORS);
590 return PTR_ERR(sk);
591 }
592
593 tunnel = true;
594 }
595
596 harderr = icmpv6_err_convert(type, code, &err);
597 np = inet6_sk(sk);
598
599 if (type == ICMPV6_PKT_TOOBIG) {
600 if (!ip6_sk_accept_pmtu(sk))
601 goto out;
602 ip6_sk_update_pmtu(skb, sk, info);
603 if (np->pmtudisc != IPV6_PMTUDISC_DONT)
604 harderr = 1;
605 }
606 if (type == NDISC_REDIRECT) {
607 if (tunnel) {
608 ip6_redirect(skb, sock_net(sk), inet6_iif(skb),
609 READ_ONCE(sk->sk_mark), sk->sk_uid);
610 } else {
611 ip6_sk_redirect(skb, sk);
612 }
613 goto out;
614 }
615
616 /* Tunnels don't have an application socket: don't pass errors back */
617 if (tunnel) {
618 if (udp_sk(sk)->encap_err_rcv)
619 udp_sk(sk)->encap_err_rcv(sk, skb, err, uh->dest,
620 ntohl(info), (u8 *)(uh+1));
621 goto out;
622 }
623
624 if (!np->recverr) {
625 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
626 goto out;
627 } else {
628 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
629 }
630
631 sk->sk_err = err;
632 sk_error_report(sk);
633 out:
634 return 0;
635 }
636
__udpv6_queue_rcv_skb(struct sock * sk,struct sk_buff * skb)637 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
638 {
639 int rc;
640
641 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
642 sock_rps_save_rxhash(sk, skb);
643 sk_mark_napi_id(sk, skb);
644 sk_incoming_cpu_update(sk);
645 } else {
646 sk_mark_napi_id_once(sk, skb);
647 }
648
649 rc = __udp_enqueue_schedule_skb(sk, skb);
650 if (rc < 0) {
651 int is_udplite = IS_UDPLITE(sk);
652 enum skb_drop_reason drop_reason;
653
654 /* Note that an ENOMEM error is charged twice */
655 if (rc == -ENOMEM) {
656 UDP6_INC_STATS(sock_net(sk),
657 UDP_MIB_RCVBUFERRORS, is_udplite);
658 drop_reason = SKB_DROP_REASON_SOCKET_RCVBUFF;
659 } else {
660 UDP6_INC_STATS(sock_net(sk),
661 UDP_MIB_MEMERRORS, is_udplite);
662 drop_reason = SKB_DROP_REASON_PROTO_MEM;
663 }
664 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
665 kfree_skb_reason(skb, drop_reason);
666 trace_udp_fail_queue_rcv_skb(rc, sk);
667 return -1;
668 }
669
670 return 0;
671 }
672
udpv6_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)673 static __inline__ int udpv6_err(struct sk_buff *skb,
674 struct inet6_skb_parm *opt, u8 type,
675 u8 code, int offset, __be32 info)
676 {
677 return __udp6_lib_err(skb, opt, type, code, offset, info,
678 dev_net(skb->dev)->ipv4.udp_table);
679 }
680
udpv6_queue_rcv_one_skb(struct sock * sk,struct sk_buff * skb)681 static int udpv6_queue_rcv_one_skb(struct sock *sk, struct sk_buff *skb)
682 {
683 enum skb_drop_reason drop_reason = SKB_DROP_REASON_NOT_SPECIFIED;
684 struct udp_sock *up = udp_sk(sk);
685 int is_udplite = IS_UDPLITE(sk);
686
687 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
688 drop_reason = SKB_DROP_REASON_XFRM_POLICY;
689 goto drop;
690 }
691 nf_reset_ct(skb);
692
693 if (static_branch_unlikely(&udpv6_encap_needed_key) &&
694 READ_ONCE(up->encap_type)) {
695 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
696
697 /*
698 * This is an encapsulation socket so pass the skb to
699 * the socket's udp_encap_rcv() hook. Otherwise, just
700 * fall through and pass this up the UDP socket.
701 * up->encap_rcv() returns the following value:
702 * =0 if skb was successfully passed to the encap
703 * handler or was discarded by it.
704 * >0 if skb should be passed on to UDP.
705 * <0 if skb should be resubmitted as proto -N
706 */
707
708 /* if we're overly short, let UDP handle it */
709 encap_rcv = READ_ONCE(up->encap_rcv);
710 if (encap_rcv) {
711 int ret;
712
713 /* Verify checksum before giving to encap */
714 if (udp_lib_checksum_complete(skb))
715 goto csum_error;
716
717 ret = encap_rcv(sk, skb);
718 if (ret <= 0) {
719 __UDP6_INC_STATS(sock_net(sk),
720 UDP_MIB_INDATAGRAMS,
721 is_udplite);
722 return -ret;
723 }
724 }
725
726 /* FALLTHROUGH -- it's a UDP Packet */
727 }
728
729 /*
730 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
731 */
732 if (udp_test_bit(UDPLITE_RECV_CC, sk) && UDP_SKB_CB(skb)->partial_cov) {
733 u16 pcrlen = READ_ONCE(up->pcrlen);
734
735 if (pcrlen == 0) { /* full coverage was set */
736 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
737 UDP_SKB_CB(skb)->cscov, skb->len);
738 goto drop;
739 }
740 if (UDP_SKB_CB(skb)->cscov < pcrlen) {
741 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
742 UDP_SKB_CB(skb)->cscov, pcrlen);
743 goto drop;
744 }
745 }
746
747 prefetch(&sk->sk_rmem_alloc);
748 if (rcu_access_pointer(sk->sk_filter) &&
749 udp_lib_checksum_complete(skb))
750 goto csum_error;
751
752 if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr))) {
753 drop_reason = SKB_DROP_REASON_SOCKET_FILTER;
754 goto drop;
755 }
756
757 udp_csum_pull_header(skb);
758
759 skb_dst_drop(skb);
760
761 return __udpv6_queue_rcv_skb(sk, skb);
762
763 csum_error:
764 drop_reason = SKB_DROP_REASON_UDP_CSUM;
765 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
766 drop:
767 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
768 atomic_inc(&sk->sk_drops);
769 kfree_skb_reason(skb, drop_reason);
770 return -1;
771 }
772
udpv6_queue_rcv_skb(struct sock * sk,struct sk_buff * skb)773 static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
774 {
775 struct sk_buff *next, *segs;
776 int ret;
777
778 if (likely(!udp_unexpected_gso(sk, skb)))
779 return udpv6_queue_rcv_one_skb(sk, skb);
780
781 __skb_push(skb, -skb_mac_offset(skb));
782 segs = udp_rcv_segment(sk, skb, false);
783 skb_list_walk_safe(segs, skb, next) {
784 __skb_pull(skb, skb_transport_offset(skb));
785
786 udp_post_segment_fix_csum(skb);
787 ret = udpv6_queue_rcv_one_skb(sk, skb);
788 if (ret > 0)
789 ip6_protocol_deliver_rcu(dev_net(skb->dev), skb, ret,
790 true);
791 }
792 return 0;
793 }
794
__udp_v6_is_mcast_sock(struct net * net,const struct sock * sk,__be16 loc_port,const struct in6_addr * loc_addr,__be16 rmt_port,const struct in6_addr * rmt_addr,int dif,int sdif,unsigned short hnum)795 static bool __udp_v6_is_mcast_sock(struct net *net, const struct sock *sk,
796 __be16 loc_port, const struct in6_addr *loc_addr,
797 __be16 rmt_port, const struct in6_addr *rmt_addr,
798 int dif, int sdif, unsigned short hnum)
799 {
800 const struct inet_sock *inet = inet_sk(sk);
801
802 if (!net_eq(sock_net(sk), net))
803 return false;
804
805 if (udp_sk(sk)->udp_port_hash != hnum ||
806 sk->sk_family != PF_INET6 ||
807 (inet->inet_dport && inet->inet_dport != rmt_port) ||
808 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
809 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
810 !udp_sk_bound_dev_eq(net, READ_ONCE(sk->sk_bound_dev_if), dif, sdif) ||
811 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
812 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
813 return false;
814 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
815 return false;
816 return true;
817 }
818
udp6_csum_zero_error(struct sk_buff * skb)819 static void udp6_csum_zero_error(struct sk_buff *skb)
820 {
821 /* RFC 2460 section 8.1 says that we SHOULD log
822 * this error. Well, it is reasonable.
823 */
824 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
825 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
826 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
827 }
828
829 /*
830 * Note: called only from the BH handler context,
831 * so we don't need to lock the hashes.
832 */
__udp6_lib_mcast_deliver(struct net * net,struct sk_buff * skb,const struct in6_addr * saddr,const struct in6_addr * daddr,struct udp_table * udptable,int proto)833 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
834 const struct in6_addr *saddr, const struct in6_addr *daddr,
835 struct udp_table *udptable, int proto)
836 {
837 struct sock *sk, *first = NULL;
838 const struct udphdr *uh = udp_hdr(skb);
839 unsigned short hnum = ntohs(uh->dest);
840 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
841 unsigned int offset = offsetof(typeof(*sk), sk_node);
842 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
843 int dif = inet6_iif(skb);
844 int sdif = inet6_sdif(skb);
845 struct hlist_node *node;
846 struct sk_buff *nskb;
847
848 if (use_hash2) {
849 hash2_any = ipv6_portaddr_hash(net, &in6addr_any, hnum) &
850 udptable->mask;
851 hash2 = ipv6_portaddr_hash(net, daddr, hnum) & udptable->mask;
852 start_lookup:
853 hslot = &udptable->hash2[hash2];
854 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
855 }
856
857 sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) {
858 if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr,
859 uh->source, saddr, dif, sdif,
860 hnum))
861 continue;
862 /* If zero checksum and no_check is not on for
863 * the socket then skip it.
864 */
865 if (!uh->check && !udp_get_no_check6_rx(sk))
866 continue;
867 if (!first) {
868 first = sk;
869 continue;
870 }
871 nskb = skb_clone(skb, GFP_ATOMIC);
872 if (unlikely(!nskb)) {
873 atomic_inc(&sk->sk_drops);
874 __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS,
875 IS_UDPLITE(sk));
876 __UDP6_INC_STATS(net, UDP_MIB_INERRORS,
877 IS_UDPLITE(sk));
878 continue;
879 }
880
881 if (udpv6_queue_rcv_skb(sk, nskb) > 0)
882 consume_skb(nskb);
883 }
884
885 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
886 if (use_hash2 && hash2 != hash2_any) {
887 hash2 = hash2_any;
888 goto start_lookup;
889 }
890
891 if (first) {
892 if (udpv6_queue_rcv_skb(first, skb) > 0)
893 consume_skb(skb);
894 } else {
895 kfree_skb(skb);
896 __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI,
897 proto == IPPROTO_UDPLITE);
898 }
899 return 0;
900 }
901
udp6_sk_rx_dst_set(struct sock * sk,struct dst_entry * dst)902 static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst)
903 {
904 if (udp_sk_rx_dst_set(sk, dst)) {
905 const struct rt6_info *rt = (const struct rt6_info *)dst;
906
907 sk->sk_rx_dst_cookie = rt6_get_cookie(rt);
908 }
909 }
910
911 /* wrapper for udp_queue_rcv_skb tacking care of csum conversion and
912 * return code conversion for ip layer consumption
913 */
udp6_unicast_rcv_skb(struct sock * sk,struct sk_buff * skb,struct udphdr * uh)914 static int udp6_unicast_rcv_skb(struct sock *sk, struct sk_buff *skb,
915 struct udphdr *uh)
916 {
917 int ret;
918
919 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
920 skb_checksum_try_convert(skb, IPPROTO_UDP, ip6_compute_pseudo);
921
922 ret = udpv6_queue_rcv_skb(sk, skb);
923
924 /* a return value > 0 means to resubmit the input */
925 if (ret > 0)
926 return ret;
927 return 0;
928 }
929
__udp6_lib_rcv(struct sk_buff * skb,struct udp_table * udptable,int proto)930 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
931 int proto)
932 {
933 enum skb_drop_reason reason = SKB_DROP_REASON_NOT_SPECIFIED;
934 const struct in6_addr *saddr, *daddr;
935 struct net *net = dev_net(skb->dev);
936 struct udphdr *uh;
937 struct sock *sk;
938 bool refcounted;
939 u32 ulen = 0;
940
941 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
942 goto discard;
943
944 saddr = &ipv6_hdr(skb)->saddr;
945 daddr = &ipv6_hdr(skb)->daddr;
946 uh = udp_hdr(skb);
947
948 ulen = ntohs(uh->len);
949 if (ulen > skb->len)
950 goto short_packet;
951
952 if (proto == IPPROTO_UDP) {
953 /* UDP validates ulen. */
954
955 /* Check for jumbo payload */
956 if (ulen == 0)
957 ulen = skb->len;
958
959 if (ulen < sizeof(*uh))
960 goto short_packet;
961
962 if (ulen < skb->len) {
963 if (pskb_trim_rcsum(skb, ulen))
964 goto short_packet;
965 saddr = &ipv6_hdr(skb)->saddr;
966 daddr = &ipv6_hdr(skb)->daddr;
967 uh = udp_hdr(skb);
968 }
969 }
970
971 if (udp6_csum_init(skb, uh, proto))
972 goto csum_error;
973
974 /* Check if the socket is already available, e.g. due to early demux */
975 sk = inet6_steal_sock(net, skb, sizeof(struct udphdr), saddr, uh->source, daddr, uh->dest,
976 &refcounted, udp6_ehashfn);
977 if (IS_ERR(sk))
978 goto no_sk;
979
980 if (sk) {
981 struct dst_entry *dst = skb_dst(skb);
982 int ret;
983
984 if (unlikely(rcu_dereference(sk->sk_rx_dst) != dst))
985 udp6_sk_rx_dst_set(sk, dst);
986
987 if (!uh->check && !udp_get_no_check6_rx(sk)) {
988 if (refcounted)
989 sock_put(sk);
990 goto report_csum_error;
991 }
992
993 ret = udp6_unicast_rcv_skb(sk, skb, uh);
994 if (refcounted)
995 sock_put(sk);
996 return ret;
997 }
998
999 /*
1000 * Multicast receive code
1001 */
1002 if (ipv6_addr_is_multicast(daddr))
1003 return __udp6_lib_mcast_deliver(net, skb,
1004 saddr, daddr, udptable, proto);
1005
1006 /* Unicast */
1007 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
1008 if (sk) {
1009 if (!uh->check && !udp_get_no_check6_rx(sk))
1010 goto report_csum_error;
1011 return udp6_unicast_rcv_skb(sk, skb, uh);
1012 }
1013 no_sk:
1014 reason = SKB_DROP_REASON_NO_SOCKET;
1015
1016 if (!uh->check)
1017 goto report_csum_error;
1018
1019 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1020 goto discard;
1021 nf_reset_ct(skb);
1022
1023 if (udp_lib_checksum_complete(skb))
1024 goto csum_error;
1025
1026 __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
1027 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
1028
1029 kfree_skb_reason(skb, reason);
1030 return 0;
1031
1032 short_packet:
1033 if (reason == SKB_DROP_REASON_NOT_SPECIFIED)
1034 reason = SKB_DROP_REASON_PKT_TOO_SMALL;
1035 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
1036 proto == IPPROTO_UDPLITE ? "-Lite" : "",
1037 saddr, ntohs(uh->source),
1038 ulen, skb->len,
1039 daddr, ntohs(uh->dest));
1040 goto discard;
1041
1042 report_csum_error:
1043 udp6_csum_zero_error(skb);
1044 csum_error:
1045 if (reason == SKB_DROP_REASON_NOT_SPECIFIED)
1046 reason = SKB_DROP_REASON_UDP_CSUM;
1047 __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
1048 discard:
1049 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
1050 kfree_skb_reason(skb, reason);
1051 return 0;
1052 }
1053
1054
__udp6_lib_demux_lookup(struct net * net,__be16 loc_port,const struct in6_addr * loc_addr,__be16 rmt_port,const struct in6_addr * rmt_addr,int dif,int sdif)1055 static struct sock *__udp6_lib_demux_lookup(struct net *net,
1056 __be16 loc_port, const struct in6_addr *loc_addr,
1057 __be16 rmt_port, const struct in6_addr *rmt_addr,
1058 int dif, int sdif)
1059 {
1060 struct udp_table *udptable = net->ipv4.udp_table;
1061 unsigned short hnum = ntohs(loc_port);
1062 unsigned int hash2, slot2;
1063 struct udp_hslot *hslot2;
1064 __portpair ports;
1065 struct sock *sk;
1066
1067 hash2 = ipv6_portaddr_hash(net, loc_addr, hnum);
1068 slot2 = hash2 & udptable->mask;
1069 hslot2 = &udptable->hash2[slot2];
1070 ports = INET_COMBINED_PORTS(rmt_port, hnum);
1071
1072 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
1073 if (sk->sk_state == TCP_ESTABLISHED &&
1074 inet6_match(net, sk, rmt_addr, loc_addr, ports, dif, sdif))
1075 return sk;
1076 /* Only check first socket in chain */
1077 break;
1078 }
1079 return NULL;
1080 }
1081
udp_v6_early_demux(struct sk_buff * skb)1082 void udp_v6_early_demux(struct sk_buff *skb)
1083 {
1084 struct net *net = dev_net(skb->dev);
1085 const struct udphdr *uh;
1086 struct sock *sk;
1087 struct dst_entry *dst;
1088 int dif = skb->dev->ifindex;
1089 int sdif = inet6_sdif(skb);
1090
1091 if (!pskb_may_pull(skb, skb_transport_offset(skb) +
1092 sizeof(struct udphdr)))
1093 return;
1094
1095 uh = udp_hdr(skb);
1096
1097 if (skb->pkt_type == PACKET_HOST)
1098 sk = __udp6_lib_demux_lookup(net, uh->dest,
1099 &ipv6_hdr(skb)->daddr,
1100 uh->source, &ipv6_hdr(skb)->saddr,
1101 dif, sdif);
1102 else
1103 return;
1104
1105 if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt))
1106 return;
1107
1108 skb->sk = sk;
1109 skb->destructor = sock_efree;
1110 dst = rcu_dereference(sk->sk_rx_dst);
1111
1112 if (dst)
1113 dst = dst_check(dst, sk->sk_rx_dst_cookie);
1114 if (dst) {
1115 /* set noref for now.
1116 * any place which wants to hold dst has to call
1117 * dst_hold_safe()
1118 */
1119 skb_dst_set_noref(skb, dst);
1120 }
1121 }
1122
udpv6_rcv(struct sk_buff * skb)1123 INDIRECT_CALLABLE_SCOPE int udpv6_rcv(struct sk_buff *skb)
1124 {
1125 return __udp6_lib_rcv(skb, dev_net(skb->dev)->ipv4.udp_table, IPPROTO_UDP);
1126 }
1127
1128 /*
1129 * Throw away all pending data and cancel the corking. Socket is locked.
1130 */
udp_v6_flush_pending_frames(struct sock * sk)1131 static void udp_v6_flush_pending_frames(struct sock *sk)
1132 {
1133 struct udp_sock *up = udp_sk(sk);
1134
1135 if (up->pending == AF_INET)
1136 udp_flush_pending_frames(sk);
1137 else if (up->pending) {
1138 up->len = 0;
1139 WRITE_ONCE(up->pending, 0);
1140 ip6_flush_pending_frames(sk);
1141 }
1142 }
1143
udpv6_pre_connect(struct sock * sk,struct sockaddr * uaddr,int addr_len)1144 static int udpv6_pre_connect(struct sock *sk, struct sockaddr *uaddr,
1145 int addr_len)
1146 {
1147 if (addr_len < offsetofend(struct sockaddr, sa_family))
1148 return -EINVAL;
1149 /* The following checks are replicated from __ip6_datagram_connect()
1150 * and intended to prevent BPF program called below from accessing
1151 * bytes that are out of the bound specified by user in addr_len.
1152 */
1153 if (uaddr->sa_family == AF_INET) {
1154 if (ipv6_only_sock(sk))
1155 return -EAFNOSUPPORT;
1156 return udp_pre_connect(sk, uaddr, addr_len);
1157 }
1158
1159 if (addr_len < SIN6_LEN_RFC2133)
1160 return -EINVAL;
1161
1162 return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr, &addr_len);
1163 }
1164
1165 /**
1166 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
1167 * @sk: socket we are sending on
1168 * @skb: sk_buff containing the filled-in UDP header
1169 * (checksum field must be zeroed out)
1170 * @saddr: source address
1171 * @daddr: destination address
1172 * @len: length of packet
1173 */
udp6_hwcsum_outgoing(struct sock * sk,struct sk_buff * skb,const struct in6_addr * saddr,const struct in6_addr * daddr,int len)1174 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
1175 const struct in6_addr *saddr,
1176 const struct in6_addr *daddr, int len)
1177 {
1178 unsigned int offset;
1179 struct udphdr *uh = udp_hdr(skb);
1180 struct sk_buff *frags = skb_shinfo(skb)->frag_list;
1181 __wsum csum = 0;
1182
1183 if (!frags) {
1184 /* Only one fragment on the socket. */
1185 skb->csum_start = skb_transport_header(skb) - skb->head;
1186 skb->csum_offset = offsetof(struct udphdr, check);
1187 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
1188 } else {
1189 /*
1190 * HW-checksum won't work as there are two or more
1191 * fragments on the socket so that all csums of sk_buffs
1192 * should be together
1193 */
1194 offset = skb_transport_offset(skb);
1195 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
1196 csum = skb->csum;
1197
1198 skb->ip_summed = CHECKSUM_NONE;
1199
1200 do {
1201 csum = csum_add(csum, frags->csum);
1202 } while ((frags = frags->next));
1203
1204 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
1205 csum);
1206 if (uh->check == 0)
1207 uh->check = CSUM_MANGLED_0;
1208 }
1209 }
1210
1211 /*
1212 * Sending
1213 */
1214
udp_v6_send_skb(struct sk_buff * skb,struct flowi6 * fl6,struct inet_cork * cork)1215 static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6,
1216 struct inet_cork *cork)
1217 {
1218 struct sock *sk = skb->sk;
1219 struct udphdr *uh;
1220 int err = 0;
1221 int is_udplite = IS_UDPLITE(sk);
1222 __wsum csum = 0;
1223 int offset = skb_transport_offset(skb);
1224 int len = skb->len - offset;
1225 int datalen = len - sizeof(*uh);
1226
1227 /*
1228 * Create a UDP header
1229 */
1230 uh = udp_hdr(skb);
1231 uh->source = fl6->fl6_sport;
1232 uh->dest = fl6->fl6_dport;
1233 uh->len = htons(len);
1234 uh->check = 0;
1235
1236 if (cork->gso_size) {
1237 const int hlen = skb_network_header_len(skb) +
1238 sizeof(struct udphdr);
1239
1240 if (hlen + cork->gso_size > cork->fragsize) {
1241 kfree_skb(skb);
1242 return -EINVAL;
1243 }
1244 if (datalen > cork->gso_size * UDP_MAX_SEGMENTS) {
1245 kfree_skb(skb);
1246 return -EINVAL;
1247 }
1248 if (udp_get_no_check6_tx(sk)) {
1249 kfree_skb(skb);
1250 return -EINVAL;
1251 }
1252 if (skb->ip_summed != CHECKSUM_PARTIAL || is_udplite ||
1253 dst_xfrm(skb_dst(skb))) {
1254 kfree_skb(skb);
1255 return -EIO;
1256 }
1257
1258 if (datalen > cork->gso_size) {
1259 skb_shinfo(skb)->gso_size = cork->gso_size;
1260 skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4;
1261 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(datalen,
1262 cork->gso_size);
1263 }
1264 goto csum_partial;
1265 }
1266
1267 if (is_udplite)
1268 csum = udplite_csum(skb);
1269 else if (udp_get_no_check6_tx(sk)) { /* UDP csum disabled */
1270 skb->ip_summed = CHECKSUM_NONE;
1271 goto send;
1272 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
1273 csum_partial:
1274 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
1275 goto send;
1276 } else
1277 csum = udp_csum(skb);
1278
1279 /* add protocol-dependent pseudo-header */
1280 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
1281 len, fl6->flowi6_proto, csum);
1282 if (uh->check == 0)
1283 uh->check = CSUM_MANGLED_0;
1284
1285 send:
1286 err = ip6_send_skb(skb);
1287 if (err) {
1288 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1289 UDP6_INC_STATS(sock_net(sk),
1290 UDP_MIB_SNDBUFERRORS, is_udplite);
1291 err = 0;
1292 }
1293 } else {
1294 UDP6_INC_STATS(sock_net(sk),
1295 UDP_MIB_OUTDATAGRAMS, is_udplite);
1296 }
1297 return err;
1298 }
1299
udp_v6_push_pending_frames(struct sock * sk)1300 static int udp_v6_push_pending_frames(struct sock *sk)
1301 {
1302 struct sk_buff *skb;
1303 struct udp_sock *up = udp_sk(sk);
1304 int err = 0;
1305
1306 if (up->pending == AF_INET)
1307 return udp_push_pending_frames(sk);
1308
1309 skb = ip6_finish_skb(sk);
1310 if (!skb)
1311 goto out;
1312
1313 err = udp_v6_send_skb(skb, &inet_sk(sk)->cork.fl.u.ip6,
1314 &inet_sk(sk)->cork.base);
1315 out:
1316 up->len = 0;
1317 WRITE_ONCE(up->pending, 0);
1318 return err;
1319 }
1320
udpv6_sendmsg(struct sock * sk,struct msghdr * msg,size_t len)1321 int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
1322 {
1323 struct ipv6_txoptions opt_space;
1324 struct udp_sock *up = udp_sk(sk);
1325 struct inet_sock *inet = inet_sk(sk);
1326 struct ipv6_pinfo *np = inet6_sk(sk);
1327 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
1328 struct in6_addr *daddr, *final_p, final;
1329 struct ipv6_txoptions *opt = NULL;
1330 struct ipv6_txoptions *opt_to_free = NULL;
1331 struct ip6_flowlabel *flowlabel = NULL;
1332 struct inet_cork_full cork;
1333 struct flowi6 *fl6 = &cork.fl.u.ip6;
1334 struct dst_entry *dst;
1335 struct ipcm6_cookie ipc6;
1336 int addr_len = msg->msg_namelen;
1337 bool connected = false;
1338 int ulen = len;
1339 int corkreq = udp_test_bit(CORK, sk) || msg->msg_flags & MSG_MORE;
1340 int err;
1341 int is_udplite = IS_UDPLITE(sk);
1342 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1343
1344 ipcm6_init(&ipc6);
1345 ipc6.gso_size = READ_ONCE(up->gso_size);
1346 ipc6.sockc.tsflags = READ_ONCE(sk->sk_tsflags);
1347 ipc6.sockc.mark = READ_ONCE(sk->sk_mark);
1348
1349 /* destination address check */
1350 if (sin6) {
1351 if (addr_len < offsetof(struct sockaddr, sa_data))
1352 return -EINVAL;
1353
1354 switch (sin6->sin6_family) {
1355 case AF_INET6:
1356 if (addr_len < SIN6_LEN_RFC2133)
1357 return -EINVAL;
1358 daddr = &sin6->sin6_addr;
1359 if (ipv6_addr_any(daddr) &&
1360 ipv6_addr_v4mapped(&np->saddr))
1361 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
1362 daddr);
1363 break;
1364 case AF_INET:
1365 goto do_udp_sendmsg;
1366 case AF_UNSPEC:
1367 msg->msg_name = sin6 = NULL;
1368 msg->msg_namelen = addr_len = 0;
1369 daddr = NULL;
1370 break;
1371 default:
1372 return -EINVAL;
1373 }
1374 } else if (!READ_ONCE(up->pending)) {
1375 if (sk->sk_state != TCP_ESTABLISHED)
1376 return -EDESTADDRREQ;
1377 daddr = &sk->sk_v6_daddr;
1378 } else
1379 daddr = NULL;
1380
1381 if (daddr) {
1382 if (ipv6_addr_v4mapped(daddr)) {
1383 struct sockaddr_in sin;
1384 sin.sin_family = AF_INET;
1385 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1386 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1387 msg->msg_name = &sin;
1388 msg->msg_namelen = sizeof(sin);
1389 do_udp_sendmsg:
1390 err = ipv6_only_sock(sk) ?
1391 -ENETUNREACH : udp_sendmsg(sk, msg, len);
1392 msg->msg_name = sin6;
1393 msg->msg_namelen = addr_len;
1394 return err;
1395 }
1396 }
1397
1398 /* Rough check on arithmetic overflow,
1399 better check is made in ip6_append_data().
1400 */
1401 if (len > INT_MAX - sizeof(struct udphdr))
1402 return -EMSGSIZE;
1403
1404 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1405 if (READ_ONCE(up->pending)) {
1406 if (READ_ONCE(up->pending) == AF_INET)
1407 return udp_sendmsg(sk, msg, len);
1408 /*
1409 * There are pending frames.
1410 * The socket lock must be held while it's corked.
1411 */
1412 lock_sock(sk);
1413 if (likely(up->pending)) {
1414 if (unlikely(up->pending != AF_INET6)) {
1415 release_sock(sk);
1416 return -EAFNOSUPPORT;
1417 }
1418 dst = NULL;
1419 goto do_append_data;
1420 }
1421 release_sock(sk);
1422 }
1423 ulen += sizeof(struct udphdr);
1424
1425 memset(fl6, 0, sizeof(*fl6));
1426
1427 if (sin6) {
1428 if (sin6->sin6_port == 0)
1429 return -EINVAL;
1430
1431 fl6->fl6_dport = sin6->sin6_port;
1432 daddr = &sin6->sin6_addr;
1433
1434 if (np->sndflow) {
1435 fl6->flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1436 if (fl6->flowlabel & IPV6_FLOWLABEL_MASK) {
1437 flowlabel = fl6_sock_lookup(sk, fl6->flowlabel);
1438 if (IS_ERR(flowlabel))
1439 return -EINVAL;
1440 }
1441 }
1442
1443 /*
1444 * Otherwise it will be difficult to maintain
1445 * sk->sk_dst_cache.
1446 */
1447 if (sk->sk_state == TCP_ESTABLISHED &&
1448 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1449 daddr = &sk->sk_v6_daddr;
1450
1451 if (addr_len >= sizeof(struct sockaddr_in6) &&
1452 sin6->sin6_scope_id &&
1453 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1454 fl6->flowi6_oif = sin6->sin6_scope_id;
1455 } else {
1456 if (sk->sk_state != TCP_ESTABLISHED)
1457 return -EDESTADDRREQ;
1458
1459 fl6->fl6_dport = inet->inet_dport;
1460 daddr = &sk->sk_v6_daddr;
1461 fl6->flowlabel = np->flow_label;
1462 connected = true;
1463 }
1464
1465 if (!fl6->flowi6_oif)
1466 fl6->flowi6_oif = READ_ONCE(sk->sk_bound_dev_if);
1467
1468 if (!fl6->flowi6_oif)
1469 fl6->flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1470
1471 fl6->flowi6_uid = sk->sk_uid;
1472
1473 if (msg->msg_controllen) {
1474 opt = &opt_space;
1475 memset(opt, 0, sizeof(struct ipv6_txoptions));
1476 opt->tot_len = sizeof(*opt);
1477 ipc6.opt = opt;
1478
1479 err = udp_cmsg_send(sk, msg, &ipc6.gso_size);
1480 if (err > 0) {
1481 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, fl6,
1482 &ipc6);
1483 connected = false;
1484 }
1485 if (err < 0) {
1486 fl6_sock_release(flowlabel);
1487 return err;
1488 }
1489 if ((fl6->flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1490 flowlabel = fl6_sock_lookup(sk, fl6->flowlabel);
1491 if (IS_ERR(flowlabel))
1492 return -EINVAL;
1493 }
1494 if (!(opt->opt_nflen|opt->opt_flen))
1495 opt = NULL;
1496 }
1497 if (!opt) {
1498 opt = txopt_get(np);
1499 opt_to_free = opt;
1500 }
1501 if (flowlabel)
1502 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1503 opt = ipv6_fixup_options(&opt_space, opt);
1504 ipc6.opt = opt;
1505
1506 fl6->flowi6_proto = sk->sk_protocol;
1507 fl6->flowi6_mark = ipc6.sockc.mark;
1508 fl6->daddr = *daddr;
1509 if (ipv6_addr_any(&fl6->saddr) && !ipv6_addr_any(&np->saddr))
1510 fl6->saddr = np->saddr;
1511 fl6->fl6_sport = inet->inet_sport;
1512
1513 if (cgroup_bpf_enabled(CGROUP_UDP6_SENDMSG) && !connected) {
1514 err = BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk,
1515 (struct sockaddr *)sin6,
1516 &addr_len,
1517 &fl6->saddr);
1518 if (err)
1519 goto out_no_dst;
1520 if (sin6) {
1521 if (ipv6_addr_v4mapped(&sin6->sin6_addr)) {
1522 /* BPF program rewrote IPv6-only by IPv4-mapped
1523 * IPv6. It's currently unsupported.
1524 */
1525 err = -ENOTSUPP;
1526 goto out_no_dst;
1527 }
1528 if (sin6->sin6_port == 0) {
1529 /* BPF program set invalid port. Reject it. */
1530 err = -EINVAL;
1531 goto out_no_dst;
1532 }
1533 fl6->fl6_dport = sin6->sin6_port;
1534 fl6->daddr = sin6->sin6_addr;
1535 }
1536 }
1537
1538 if (ipv6_addr_any(&fl6->daddr))
1539 fl6->daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1540
1541 final_p = fl6_update_dst(fl6, opt, &final);
1542 if (final_p)
1543 connected = false;
1544
1545 if (!fl6->flowi6_oif && ipv6_addr_is_multicast(&fl6->daddr)) {
1546 fl6->flowi6_oif = np->mcast_oif;
1547 connected = false;
1548 } else if (!fl6->flowi6_oif)
1549 fl6->flowi6_oif = np->ucast_oif;
1550
1551 security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6));
1552
1553 if (ipc6.tclass < 0)
1554 ipc6.tclass = np->tclass;
1555
1556 fl6->flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6->flowlabel);
1557
1558 dst = ip6_sk_dst_lookup_flow(sk, fl6, final_p, connected);
1559 if (IS_ERR(dst)) {
1560 err = PTR_ERR(dst);
1561 dst = NULL;
1562 goto out;
1563 }
1564
1565 if (ipc6.hlimit < 0)
1566 ipc6.hlimit = ip6_sk_dst_hoplimit(np, fl6, dst);
1567
1568 if (msg->msg_flags&MSG_CONFIRM)
1569 goto do_confirm;
1570 back_from_confirm:
1571
1572 /* Lockless fast path for the non-corking case */
1573 if (!corkreq) {
1574 struct sk_buff *skb;
1575
1576 skb = ip6_make_skb(sk, getfrag, msg, ulen,
1577 sizeof(struct udphdr), &ipc6,
1578 (struct rt6_info *)dst,
1579 msg->msg_flags, &cork);
1580 err = PTR_ERR(skb);
1581 if (!IS_ERR_OR_NULL(skb))
1582 err = udp_v6_send_skb(skb, fl6, &cork.base);
1583 /* ip6_make_skb steals dst reference */
1584 goto out_no_dst;
1585 }
1586
1587 lock_sock(sk);
1588 if (unlikely(up->pending)) {
1589 /* The socket is already corked while preparing it. */
1590 /* ... which is an evident application bug. --ANK */
1591 release_sock(sk);
1592
1593 net_dbg_ratelimited("udp cork app bug 2\n");
1594 err = -EINVAL;
1595 goto out;
1596 }
1597
1598 WRITE_ONCE(up->pending, AF_INET6);
1599
1600 do_append_data:
1601 if (ipc6.dontfrag < 0)
1602 ipc6.dontfrag = np->dontfrag;
1603 up->len += ulen;
1604 err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr),
1605 &ipc6, fl6, (struct rt6_info *)dst,
1606 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
1607 if (err)
1608 udp_v6_flush_pending_frames(sk);
1609 else if (!corkreq)
1610 err = udp_v6_push_pending_frames(sk);
1611 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1612 WRITE_ONCE(up->pending, 0);
1613
1614 if (err > 0)
1615 err = np->recverr ? net_xmit_errno(err) : 0;
1616 release_sock(sk);
1617
1618 out:
1619 dst_release(dst);
1620 out_no_dst:
1621 fl6_sock_release(flowlabel);
1622 txopt_put(opt_to_free);
1623 if (!err)
1624 return len;
1625 /*
1626 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1627 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1628 * we don't have a good statistic (IpOutDiscards but it can be too many
1629 * things). We could add another new stat but at least for now that
1630 * seems like overkill.
1631 */
1632 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1633 UDP6_INC_STATS(sock_net(sk),
1634 UDP_MIB_SNDBUFERRORS, is_udplite);
1635 }
1636 return err;
1637
1638 do_confirm:
1639 if (msg->msg_flags & MSG_PROBE)
1640 dst_confirm_neigh(dst, &fl6->daddr);
1641 if (!(msg->msg_flags&MSG_PROBE) || len)
1642 goto back_from_confirm;
1643 err = 0;
1644 goto out;
1645 }
1646 EXPORT_SYMBOL(udpv6_sendmsg);
1647
udpv6_splice_eof(struct socket * sock)1648 static void udpv6_splice_eof(struct socket *sock)
1649 {
1650 struct sock *sk = sock->sk;
1651 struct udp_sock *up = udp_sk(sk);
1652
1653 if (!READ_ONCE(up->pending) || udp_test_bit(CORK, sk))
1654 return;
1655
1656 lock_sock(sk);
1657 if (up->pending && !udp_test_bit(CORK, sk))
1658 udp_v6_push_pending_frames(sk);
1659 release_sock(sk);
1660 }
1661
udpv6_destroy_sock(struct sock * sk)1662 void udpv6_destroy_sock(struct sock *sk)
1663 {
1664 struct udp_sock *up = udp_sk(sk);
1665 lock_sock(sk);
1666
1667 /* protects from races with udp_abort() */
1668 sock_set_flag(sk, SOCK_DEAD);
1669 udp_v6_flush_pending_frames(sk);
1670 release_sock(sk);
1671
1672 if (static_branch_unlikely(&udpv6_encap_needed_key)) {
1673 if (up->encap_type) {
1674 void (*encap_destroy)(struct sock *sk);
1675 encap_destroy = READ_ONCE(up->encap_destroy);
1676 if (encap_destroy)
1677 encap_destroy(sk);
1678 }
1679 if (udp_test_bit(ENCAP_ENABLED, sk)) {
1680 static_branch_dec(&udpv6_encap_needed_key);
1681 udp_encap_disable();
1682 }
1683 }
1684 }
1685
1686 /*
1687 * Socket option code for UDP
1688 */
udpv6_setsockopt(struct sock * sk,int level,int optname,sockptr_t optval,unsigned int optlen)1689 int udpv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1690 unsigned int optlen)
1691 {
1692 if (level == SOL_UDP || level == SOL_UDPLITE || level == SOL_SOCKET)
1693 return udp_lib_setsockopt(sk, level, optname,
1694 optval, optlen,
1695 udp_v6_push_pending_frames);
1696 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1697 }
1698
udpv6_getsockopt(struct sock * sk,int level,int optname,char __user * optval,int __user * optlen)1699 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1700 char __user *optval, int __user *optlen)
1701 {
1702 if (level == SOL_UDP || level == SOL_UDPLITE)
1703 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1704 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1705 }
1706
1707 static const struct inet6_protocol udpv6_protocol = {
1708 .handler = udpv6_rcv,
1709 .err_handler = udpv6_err,
1710 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1711 };
1712
1713 /* ------------------------------------------------------------------------ */
1714 #ifdef CONFIG_PROC_FS
udp6_seq_show(struct seq_file * seq,void * v)1715 int udp6_seq_show(struct seq_file *seq, void *v)
1716 {
1717 if (v == SEQ_START_TOKEN) {
1718 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1719 } else {
1720 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1721 const struct inet_sock *inet = inet_sk((const struct sock *)v);
1722 __u16 srcp = ntohs(inet->inet_sport);
1723 __u16 destp = ntohs(inet->inet_dport);
1724 __ip6_dgram_sock_seq_show(seq, v, srcp, destp,
1725 udp_rqueue_get(v), bucket);
1726 }
1727 return 0;
1728 }
1729
1730 const struct seq_operations udp6_seq_ops = {
1731 .start = udp_seq_start,
1732 .next = udp_seq_next,
1733 .stop = udp_seq_stop,
1734 .show = udp6_seq_show,
1735 };
1736 EXPORT_SYMBOL(udp6_seq_ops);
1737
1738 static struct udp_seq_afinfo udp6_seq_afinfo = {
1739 .family = AF_INET6,
1740 .udp_table = NULL,
1741 };
1742
udp6_proc_init(struct net * net)1743 int __net_init udp6_proc_init(struct net *net)
1744 {
1745 if (!proc_create_net_data("udp6", 0444, net->proc_net, &udp6_seq_ops,
1746 sizeof(struct udp_iter_state), &udp6_seq_afinfo))
1747 return -ENOMEM;
1748 return 0;
1749 }
1750
udp6_proc_exit(struct net * net)1751 void udp6_proc_exit(struct net *net)
1752 {
1753 remove_proc_entry("udp6", net->proc_net);
1754 }
1755 #endif /* CONFIG_PROC_FS */
1756
1757 /* ------------------------------------------------------------------------ */
1758
1759 struct proto udpv6_prot = {
1760 .name = "UDPv6",
1761 .owner = THIS_MODULE,
1762 .close = udp_lib_close,
1763 .pre_connect = udpv6_pre_connect,
1764 .connect = ip6_datagram_connect,
1765 .disconnect = udp_disconnect,
1766 .ioctl = udp_ioctl,
1767 .init = udpv6_init_sock,
1768 .destroy = udpv6_destroy_sock,
1769 .setsockopt = udpv6_setsockopt,
1770 .getsockopt = udpv6_getsockopt,
1771 .sendmsg = udpv6_sendmsg,
1772 .recvmsg = udpv6_recvmsg,
1773 .splice_eof = udpv6_splice_eof,
1774 .release_cb = ip6_datagram_release_cb,
1775 .hash = udp_lib_hash,
1776 .unhash = udp_lib_unhash,
1777 .rehash = udp_v6_rehash,
1778 .get_port = udp_v6_get_port,
1779 .put_port = udp_lib_unhash,
1780 #ifdef CONFIG_BPF_SYSCALL
1781 .psock_update_sk_prot = udp_bpf_update_proto,
1782 #endif
1783
1784 .memory_allocated = &udp_memory_allocated,
1785 .per_cpu_fw_alloc = &udp_memory_per_cpu_fw_alloc,
1786
1787 .sysctl_mem = sysctl_udp_mem,
1788 .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min),
1789 .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min),
1790 .obj_size = sizeof(struct udp6_sock),
1791 .ipv6_pinfo_offset = offsetof(struct udp6_sock, inet6),
1792 .h.udp_table = NULL,
1793 .diag_destroy = udp_abort,
1794 };
1795
1796 static struct inet_protosw udpv6_protosw = {
1797 .type = SOCK_DGRAM,
1798 .protocol = IPPROTO_UDP,
1799 .prot = &udpv6_prot,
1800 .ops = &inet6_dgram_ops,
1801 .flags = INET_PROTOSW_PERMANENT,
1802 };
1803
udpv6_init(void)1804 int __init udpv6_init(void)
1805 {
1806 int ret;
1807
1808 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1809 if (ret)
1810 goto out;
1811
1812 ret = inet6_register_protosw(&udpv6_protosw);
1813 if (ret)
1814 goto out_udpv6_protocol;
1815 out:
1816 return ret;
1817
1818 out_udpv6_protocol:
1819 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1820 goto out;
1821 }
1822
udpv6_exit(void)1823 void udpv6_exit(void)
1824 {
1825 inet6_unregister_protosw(&udpv6_protosw);
1826 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1827 }
1828