1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * IPv6 BSD socket options interface
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 *
9 * Based on linux/net/ipv4/ip_sockglue.c
10 *
11 * FIXME: Make the setsockopt code POSIX compliant: That is
12 *
13 * o Truncate getsockopt returns
14 * o Return an optlen of the truncated length if need be
15 *
16 * Changes:
17 * David L Stevens <dlstevens@us.ibm.com>:
18 * - added multicast source filtering API for MLDv2
19 */
20
21 #include <linux/module.h>
22 #include <linux/capability.h>
23 #include <linux/errno.h>
24 #include <linux/types.h>
25 #include <linux/socket.h>
26 #include <linux/sockios.h>
27 #include <linux/net.h>
28 #include <linux/in6.h>
29 #include <linux/mroute6.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_arp.h>
32 #include <linux/init.h>
33 #include <linux/sysctl.h>
34 #include <linux/netfilter.h>
35 #include <linux/slab.h>
36
37 #include <net/sock.h>
38 #include <net/snmp.h>
39 #include <net/ipv6.h>
40 #include <net/ndisc.h>
41 #include <net/protocol.h>
42 #include <net/transp_v6.h>
43 #include <net/ip6_route.h>
44 #include <net/addrconf.h>
45 #include <net/inet_common.h>
46 #include <net/tcp.h>
47 #include <net/udp.h>
48 #include <net/udplite.h>
49 #include <net/xfrm.h>
50 #include <net/compat.h>
51 #include <net/seg6.h>
52
53 #include <linux/uaccess.h>
54
55 struct ip6_ra_chain *ip6_ra_chain;
56 DEFINE_RWLOCK(ip6_ra_lock);
57
58 DEFINE_STATIC_KEY_FALSE(ip6_min_hopcount);
59
ip6_ra_control(struct sock * sk,int sel)60 int ip6_ra_control(struct sock *sk, int sel)
61 {
62 struct ip6_ra_chain *ra, *new_ra, **rap;
63
64 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
65 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
66 return -ENOPROTOOPT;
67
68 new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
69 if (sel >= 0 && !new_ra)
70 return -ENOMEM;
71
72 write_lock_bh(&ip6_ra_lock);
73 for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
74 if (ra->sk == sk) {
75 if (sel >= 0) {
76 write_unlock_bh(&ip6_ra_lock);
77 kfree(new_ra);
78 return -EADDRINUSE;
79 }
80
81 *rap = ra->next;
82 write_unlock_bh(&ip6_ra_lock);
83
84 sock_put(sk);
85 kfree(ra);
86 return 0;
87 }
88 }
89 if (!new_ra) {
90 write_unlock_bh(&ip6_ra_lock);
91 return -ENOBUFS;
92 }
93 new_ra->sk = sk;
94 new_ra->sel = sel;
95 new_ra->next = ra;
96 *rap = new_ra;
97 sock_hold(sk);
98 write_unlock_bh(&ip6_ra_lock);
99 return 0;
100 }
101
ipv6_update_options(struct sock * sk,struct ipv6_txoptions * opt)102 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
103 struct ipv6_txoptions *opt)
104 {
105 if (inet_test_bit(IS_ICSK, sk)) {
106 if (opt &&
107 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
108 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
109 struct inet_connection_sock *icsk = inet_csk(sk);
110 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
111 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
112 }
113 }
114 opt = unrcu_pointer(xchg(&inet6_sk(sk)->opt, RCU_INITIALIZER(opt)));
115 sk_dst_reset(sk);
116
117 return opt;
118 }
119
setsockopt_needs_rtnl(int optname)120 static bool setsockopt_needs_rtnl(int optname)
121 {
122 switch (optname) {
123 case IPV6_ADDRFORM:
124 case IPV6_ADD_MEMBERSHIP:
125 case IPV6_DROP_MEMBERSHIP:
126 case IPV6_JOIN_ANYCAST:
127 case IPV6_LEAVE_ANYCAST:
128 case MCAST_JOIN_GROUP:
129 case MCAST_LEAVE_GROUP:
130 case MCAST_JOIN_SOURCE_GROUP:
131 case MCAST_LEAVE_SOURCE_GROUP:
132 case MCAST_BLOCK_SOURCE:
133 case MCAST_UNBLOCK_SOURCE:
134 case MCAST_MSFILTER:
135 return true;
136 }
137 return false;
138 }
139
copy_group_source_from_sockptr(struct group_source_req * greqs,sockptr_t optval,int optlen)140 static int copy_group_source_from_sockptr(struct group_source_req *greqs,
141 sockptr_t optval, int optlen)
142 {
143 if (in_compat_syscall()) {
144 struct compat_group_source_req gr32;
145
146 if (optlen < sizeof(gr32))
147 return -EINVAL;
148 if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
149 return -EFAULT;
150 greqs->gsr_interface = gr32.gsr_interface;
151 greqs->gsr_group = gr32.gsr_group;
152 greqs->gsr_source = gr32.gsr_source;
153 } else {
154 if (optlen < sizeof(*greqs))
155 return -EINVAL;
156 if (copy_from_sockptr(greqs, optval, sizeof(*greqs)))
157 return -EFAULT;
158 }
159
160 return 0;
161 }
162
do_ipv6_mcast_group_source(struct sock * sk,int optname,sockptr_t optval,int optlen)163 static int do_ipv6_mcast_group_source(struct sock *sk, int optname,
164 sockptr_t optval, int optlen)
165 {
166 struct group_source_req greqs;
167 int omode, add;
168 int ret;
169
170 ret = copy_group_source_from_sockptr(&greqs, optval, optlen);
171 if (ret)
172 return ret;
173
174 if (greqs.gsr_group.ss_family != AF_INET6 ||
175 greqs.gsr_source.ss_family != AF_INET6)
176 return -EADDRNOTAVAIL;
177
178 if (optname == MCAST_BLOCK_SOURCE) {
179 omode = MCAST_EXCLUDE;
180 add = 1;
181 } else if (optname == MCAST_UNBLOCK_SOURCE) {
182 omode = MCAST_EXCLUDE;
183 add = 0;
184 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
185 struct sockaddr_in6 *psin6;
186 int retv;
187
188 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
189 retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
190 &psin6->sin6_addr,
191 MCAST_INCLUDE);
192 /* prior join w/ different source is ok */
193 if (retv && retv != -EADDRINUSE)
194 return retv;
195 omode = MCAST_INCLUDE;
196 add = 1;
197 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
198 omode = MCAST_INCLUDE;
199 add = 0;
200 }
201 return ip6_mc_source(add, omode, sk, &greqs);
202 }
203
ipv6_set_mcast_msfilter(struct sock * sk,sockptr_t optval,int optlen)204 static int ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
205 int optlen)
206 {
207 struct group_filter *gsf;
208 int ret;
209
210 if (optlen < GROUP_FILTER_SIZE(0))
211 return -EINVAL;
212 if (optlen > READ_ONCE(sysctl_optmem_max))
213 return -ENOBUFS;
214
215 gsf = memdup_sockptr(optval, optlen);
216 if (IS_ERR(gsf))
217 return PTR_ERR(gsf);
218
219 /* numsrc >= (4G-140)/128 overflow in 32 bits */
220 ret = -ENOBUFS;
221 if (gsf->gf_numsrc >= 0x1ffffffU ||
222 gsf->gf_numsrc > sysctl_mld_max_msf)
223 goto out_free_gsf;
224
225 ret = -EINVAL;
226 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen)
227 goto out_free_gsf;
228
229 ret = ip6_mc_msfilter(sk, gsf, gsf->gf_slist_flex);
230 out_free_gsf:
231 kfree(gsf);
232 return ret;
233 }
234
compat_ipv6_set_mcast_msfilter(struct sock * sk,sockptr_t optval,int optlen)235 static int compat_ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
236 int optlen)
237 {
238 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
239 struct compat_group_filter *gf32;
240 void *p;
241 int ret;
242 int n;
243
244 if (optlen < size0)
245 return -EINVAL;
246 if (optlen > READ_ONCE(sysctl_optmem_max) - 4)
247 return -ENOBUFS;
248
249 p = kmalloc(optlen + 4, GFP_KERNEL);
250 if (!p)
251 return -ENOMEM;
252
253 gf32 = p + 4; /* we want ->gf_group and ->gf_slist_flex aligned */
254 ret = -EFAULT;
255 if (copy_from_sockptr(gf32, optval, optlen))
256 goto out_free_p;
257
258 /* numsrc >= (4G-140)/128 overflow in 32 bits */
259 ret = -ENOBUFS;
260 n = gf32->gf_numsrc;
261 if (n >= 0x1ffffffU || n > sysctl_mld_max_msf)
262 goto out_free_p;
263
264 ret = -EINVAL;
265 if (offsetof(struct compat_group_filter, gf_slist_flex[n]) > optlen)
266 goto out_free_p;
267
268 ret = ip6_mc_msfilter(sk, &(struct group_filter){
269 .gf_interface = gf32->gf_interface,
270 .gf_group = gf32->gf_group,
271 .gf_fmode = gf32->gf_fmode,
272 .gf_numsrc = gf32->gf_numsrc}, gf32->gf_slist_flex);
273
274 out_free_p:
275 kfree(p);
276 return ret;
277 }
278
ipv6_mcast_join_leave(struct sock * sk,int optname,sockptr_t optval,int optlen)279 static int ipv6_mcast_join_leave(struct sock *sk, int optname,
280 sockptr_t optval, int optlen)
281 {
282 struct sockaddr_in6 *psin6;
283 struct group_req greq;
284
285 if (optlen < sizeof(greq))
286 return -EINVAL;
287 if (copy_from_sockptr(&greq, optval, sizeof(greq)))
288 return -EFAULT;
289
290 if (greq.gr_group.ss_family != AF_INET6)
291 return -EADDRNOTAVAIL;
292 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
293 if (optname == MCAST_JOIN_GROUP)
294 return ipv6_sock_mc_join(sk, greq.gr_interface,
295 &psin6->sin6_addr);
296 return ipv6_sock_mc_drop(sk, greq.gr_interface, &psin6->sin6_addr);
297 }
298
compat_ipv6_mcast_join_leave(struct sock * sk,int optname,sockptr_t optval,int optlen)299 static int compat_ipv6_mcast_join_leave(struct sock *sk, int optname,
300 sockptr_t optval, int optlen)
301 {
302 struct compat_group_req gr32;
303 struct sockaddr_in6 *psin6;
304
305 if (optlen < sizeof(gr32))
306 return -EINVAL;
307 if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
308 return -EFAULT;
309
310 if (gr32.gr_group.ss_family != AF_INET6)
311 return -EADDRNOTAVAIL;
312 psin6 = (struct sockaddr_in6 *)&gr32.gr_group;
313 if (optname == MCAST_JOIN_GROUP)
314 return ipv6_sock_mc_join(sk, gr32.gr_interface,
315 &psin6->sin6_addr);
316 return ipv6_sock_mc_drop(sk, gr32.gr_interface, &psin6->sin6_addr);
317 }
318
ipv6_set_opt_hdr(struct sock * sk,int optname,sockptr_t optval,int optlen)319 static int ipv6_set_opt_hdr(struct sock *sk, int optname, sockptr_t optval,
320 int optlen)
321 {
322 struct ipv6_pinfo *np = inet6_sk(sk);
323 struct ipv6_opt_hdr *new = NULL;
324 struct net *net = sock_net(sk);
325 struct ipv6_txoptions *opt;
326 int err;
327
328 /* hop-by-hop / destination options are privileged option */
329 if (optname != IPV6_RTHDR && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW))
330 return -EPERM;
331
332 /* remove any sticky options header with a zero option
333 * length, per RFC3542.
334 */
335 if (optlen > 0) {
336 if (sockptr_is_null(optval))
337 return -EINVAL;
338 if (optlen < sizeof(struct ipv6_opt_hdr) ||
339 optlen & 0x7 ||
340 optlen > 8 * 255)
341 return -EINVAL;
342
343 new = memdup_sockptr(optval, optlen);
344 if (IS_ERR(new))
345 return PTR_ERR(new);
346 if (unlikely(ipv6_optlen(new) > optlen)) {
347 kfree(new);
348 return -EINVAL;
349 }
350 }
351
352 opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk));
353 opt = ipv6_renew_options(sk, opt, optname, new);
354 kfree(new);
355 if (IS_ERR(opt))
356 return PTR_ERR(opt);
357
358 /* routing header option needs extra check */
359 err = -EINVAL;
360 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
361 struct ipv6_rt_hdr *rthdr = opt->srcrt;
362 switch (rthdr->type) {
363 #if IS_ENABLED(CONFIG_IPV6_MIP6)
364 case IPV6_SRCRT_TYPE_2:
365 if (rthdr->hdrlen != 2 || rthdr->segments_left != 1)
366 goto sticky_done;
367 break;
368 #endif
369 case IPV6_SRCRT_TYPE_4:
370 {
371 struct ipv6_sr_hdr *srh =
372 (struct ipv6_sr_hdr *)opt->srcrt;
373
374 if (!seg6_validate_srh(srh, optlen, false))
375 goto sticky_done;
376 break;
377 }
378 default:
379 goto sticky_done;
380 }
381 }
382
383 err = 0;
384 opt = ipv6_update_options(sk, opt);
385 sticky_done:
386 if (opt) {
387 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
388 txopt_put(opt);
389 }
390 return err;
391 }
392
do_ipv6_setsockopt(struct sock * sk,int level,int optname,sockptr_t optval,unsigned int optlen)393 int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
394 sockptr_t optval, unsigned int optlen)
395 {
396 struct ipv6_pinfo *np = inet6_sk(sk);
397 struct net *net = sock_net(sk);
398 int val, valbool;
399 int retv = -ENOPROTOOPT;
400 bool needs_rtnl = setsockopt_needs_rtnl(optname);
401
402 if (sockptr_is_null(optval))
403 val = 0;
404 else {
405 if (optlen >= sizeof(int)) {
406 if (copy_from_sockptr(&val, optval, sizeof(val)))
407 return -EFAULT;
408 } else
409 val = 0;
410 }
411
412 valbool = (val != 0);
413
414 if (ip6_mroute_opt(optname))
415 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
416
417 if (needs_rtnl)
418 rtnl_lock();
419 sockopt_lock_sock(sk);
420
421 /* Another thread has converted the socket into IPv4 with
422 * IPV6_ADDRFORM concurrently.
423 */
424 if (unlikely(sk->sk_family != AF_INET6))
425 goto unlock;
426
427 switch (optname) {
428
429 case IPV6_ADDRFORM:
430 if (optlen < sizeof(int))
431 goto e_inval;
432 if (val == PF_INET) {
433 if (sk->sk_type == SOCK_RAW)
434 break;
435
436 if (sk->sk_protocol == IPPROTO_UDP ||
437 sk->sk_protocol == IPPROTO_UDPLITE) {
438 struct udp_sock *up = udp_sk(sk);
439 if (up->pending == AF_INET6) {
440 retv = -EBUSY;
441 break;
442 }
443 } else if (sk->sk_protocol == IPPROTO_TCP) {
444 if (sk->sk_prot != &tcpv6_prot) {
445 retv = -EBUSY;
446 break;
447 }
448 } else {
449 break;
450 }
451
452 if (sk->sk_state != TCP_ESTABLISHED) {
453 retv = -ENOTCONN;
454 break;
455 }
456
457 if (ipv6_only_sock(sk) ||
458 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
459 retv = -EADDRNOTAVAIL;
460 break;
461 }
462
463 __ipv6_sock_mc_close(sk);
464 __ipv6_sock_ac_close(sk);
465
466 if (sk->sk_protocol == IPPROTO_TCP) {
467 struct inet_connection_sock *icsk = inet_csk(sk);
468
469 sock_prot_inuse_add(net, sk->sk_prot, -1);
470 sock_prot_inuse_add(net, &tcp_prot, 1);
471
472 /* Paired with READ_ONCE(sk->sk_prot) in inet6_stream_ops */
473 WRITE_ONCE(sk->sk_prot, &tcp_prot);
474 /* Paired with READ_ONCE() in tcp_(get|set)sockopt() */
475 WRITE_ONCE(icsk->icsk_af_ops, &ipv4_specific);
476 WRITE_ONCE(sk->sk_socket->ops, &inet_stream_ops);
477 WRITE_ONCE(sk->sk_family, PF_INET);
478 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
479 } else {
480 struct proto *prot = &udp_prot;
481
482 if (sk->sk_protocol == IPPROTO_UDPLITE)
483 prot = &udplite_prot;
484
485 sock_prot_inuse_add(net, sk->sk_prot, -1);
486 sock_prot_inuse_add(net, prot, 1);
487
488 /* Paired with READ_ONCE(sk->sk_prot) in inet6_dgram_ops */
489 WRITE_ONCE(sk->sk_prot, prot);
490 WRITE_ONCE(sk->sk_socket->ops, &inet_dgram_ops);
491 WRITE_ONCE(sk->sk_family, PF_INET);
492 }
493
494 /* Disable all options not to allocate memory anymore,
495 * but there is still a race. See the lockless path
496 * in udpv6_sendmsg() and ipv6_local_rxpmtu().
497 */
498 np->rxopt.all = 0;
499
500 inet6_cleanup_sock(sk);
501
502 module_put(THIS_MODULE);
503 retv = 0;
504 break;
505 }
506 goto e_inval;
507
508 case IPV6_V6ONLY:
509 if (optlen < sizeof(int) ||
510 inet_sk(sk)->inet_num)
511 goto e_inval;
512 sk->sk_ipv6only = valbool;
513 retv = 0;
514 break;
515
516 case IPV6_RECVPKTINFO:
517 if (optlen < sizeof(int))
518 goto e_inval;
519 np->rxopt.bits.rxinfo = valbool;
520 retv = 0;
521 break;
522
523 case IPV6_2292PKTINFO:
524 if (optlen < sizeof(int))
525 goto e_inval;
526 np->rxopt.bits.rxoinfo = valbool;
527 retv = 0;
528 break;
529
530 case IPV6_RECVHOPLIMIT:
531 if (optlen < sizeof(int))
532 goto e_inval;
533 np->rxopt.bits.rxhlim = valbool;
534 retv = 0;
535 break;
536
537 case IPV6_2292HOPLIMIT:
538 if (optlen < sizeof(int))
539 goto e_inval;
540 np->rxopt.bits.rxohlim = valbool;
541 retv = 0;
542 break;
543
544 case IPV6_RECVRTHDR:
545 if (optlen < sizeof(int))
546 goto e_inval;
547 np->rxopt.bits.srcrt = valbool;
548 retv = 0;
549 break;
550
551 case IPV6_2292RTHDR:
552 if (optlen < sizeof(int))
553 goto e_inval;
554 np->rxopt.bits.osrcrt = valbool;
555 retv = 0;
556 break;
557
558 case IPV6_RECVHOPOPTS:
559 if (optlen < sizeof(int))
560 goto e_inval;
561 np->rxopt.bits.hopopts = valbool;
562 retv = 0;
563 break;
564
565 case IPV6_2292HOPOPTS:
566 if (optlen < sizeof(int))
567 goto e_inval;
568 np->rxopt.bits.ohopopts = valbool;
569 retv = 0;
570 break;
571
572 case IPV6_RECVDSTOPTS:
573 if (optlen < sizeof(int))
574 goto e_inval;
575 np->rxopt.bits.dstopts = valbool;
576 retv = 0;
577 break;
578
579 case IPV6_2292DSTOPTS:
580 if (optlen < sizeof(int))
581 goto e_inval;
582 np->rxopt.bits.odstopts = valbool;
583 retv = 0;
584 break;
585
586 case IPV6_TCLASS:
587 if (optlen < sizeof(int))
588 goto e_inval;
589 if (val < -1 || val > 0xff)
590 goto e_inval;
591 /* RFC 3542, 6.5: default traffic class of 0x0 */
592 if (val == -1)
593 val = 0;
594 if (sk->sk_type == SOCK_STREAM) {
595 val &= ~INET_ECN_MASK;
596 val |= np->tclass & INET_ECN_MASK;
597 }
598 if (np->tclass != val) {
599 np->tclass = val;
600 sk_dst_reset(sk);
601 }
602 retv = 0;
603 break;
604
605 case IPV6_RECVTCLASS:
606 if (optlen < sizeof(int))
607 goto e_inval;
608 np->rxopt.bits.rxtclass = valbool;
609 retv = 0;
610 break;
611
612 case IPV6_FLOWINFO:
613 if (optlen < sizeof(int))
614 goto e_inval;
615 np->rxopt.bits.rxflow = valbool;
616 retv = 0;
617 break;
618
619 case IPV6_RECVPATHMTU:
620 if (optlen < sizeof(int))
621 goto e_inval;
622 np->rxopt.bits.rxpmtu = valbool;
623 retv = 0;
624 break;
625
626 case IPV6_TRANSPARENT:
627 if (valbool && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW) &&
628 !sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) {
629 retv = -EPERM;
630 break;
631 }
632 if (optlen < sizeof(int))
633 goto e_inval;
634 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
635 inet_assign_bit(TRANSPARENT, sk, valbool);
636 retv = 0;
637 break;
638
639 case IPV6_FREEBIND:
640 if (optlen < sizeof(int))
641 goto e_inval;
642 /* we also don't have a separate freebind bit for IPV6 */
643 inet_assign_bit(FREEBIND, sk, valbool);
644 retv = 0;
645 break;
646
647 case IPV6_RECVORIGDSTADDR:
648 if (optlen < sizeof(int))
649 goto e_inval;
650 np->rxopt.bits.rxorigdstaddr = valbool;
651 retv = 0;
652 break;
653
654 case IPV6_HOPOPTS:
655 case IPV6_RTHDRDSTOPTS:
656 case IPV6_RTHDR:
657 case IPV6_DSTOPTS:
658 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen);
659 break;
660
661 case IPV6_PKTINFO:
662 {
663 struct in6_pktinfo pkt;
664
665 if (optlen == 0)
666 goto e_inval;
667 else if (optlen < sizeof(struct in6_pktinfo) ||
668 sockptr_is_null(optval))
669 goto e_inval;
670
671 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) {
672 retv = -EFAULT;
673 break;
674 }
675 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
676 goto e_inval;
677
678 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
679 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
680 retv = 0;
681 break;
682 }
683
684 case IPV6_2292PKTOPTIONS:
685 {
686 struct ipv6_txoptions *opt = NULL;
687 struct msghdr msg;
688 struct flowi6 fl6;
689 struct ipcm6_cookie ipc6;
690
691 memset(&fl6, 0, sizeof(fl6));
692 fl6.flowi6_oif = sk->sk_bound_dev_if;
693 fl6.flowi6_mark = sk->sk_mark;
694
695 if (optlen == 0)
696 goto update;
697
698 /* 1K is probably excessive
699 * 1K is surely not enough, 2K per standard header is 16K.
700 */
701 retv = -EINVAL;
702 if (optlen > 64*1024)
703 break;
704
705 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
706 retv = -ENOBUFS;
707 if (!opt)
708 break;
709
710 memset(opt, 0, sizeof(*opt));
711 refcount_set(&opt->refcnt, 1);
712 opt->tot_len = sizeof(*opt) + optlen;
713 retv = -EFAULT;
714 if (copy_from_sockptr(opt + 1, optval, optlen))
715 goto done;
716
717 msg.msg_controllen = optlen;
718 msg.msg_control_is_user = false;
719 msg.msg_control = (void *)(opt+1);
720 ipc6.opt = opt;
721
722 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
723 if (retv)
724 goto done;
725 update:
726 retv = 0;
727 opt = ipv6_update_options(sk, opt);
728 done:
729 if (opt) {
730 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
731 txopt_put(opt);
732 }
733 break;
734 }
735 case IPV6_UNICAST_HOPS:
736 if (optlen < sizeof(int))
737 goto e_inval;
738 if (val > 255 || val < -1)
739 goto e_inval;
740 np->hop_limit = val;
741 retv = 0;
742 break;
743
744 case IPV6_MULTICAST_HOPS:
745 if (sk->sk_type == SOCK_STREAM)
746 break;
747 if (optlen < sizeof(int))
748 goto e_inval;
749 if (val > 255 || val < -1)
750 goto e_inval;
751 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
752 retv = 0;
753 break;
754
755 case IPV6_MULTICAST_LOOP:
756 if (optlen < sizeof(int))
757 goto e_inval;
758 if (val != valbool)
759 goto e_inval;
760 np->mc_loop = valbool;
761 retv = 0;
762 break;
763
764 case IPV6_UNICAST_IF:
765 {
766 struct net_device *dev = NULL;
767 int ifindex;
768
769 if (optlen != sizeof(int))
770 goto e_inval;
771
772 ifindex = (__force int)ntohl((__force __be32)val);
773 if (ifindex == 0) {
774 np->ucast_oif = 0;
775 retv = 0;
776 break;
777 }
778
779 dev = dev_get_by_index(net, ifindex);
780 retv = -EADDRNOTAVAIL;
781 if (!dev)
782 break;
783 dev_put(dev);
784
785 retv = -EINVAL;
786 if (sk->sk_bound_dev_if)
787 break;
788
789 np->ucast_oif = ifindex;
790 retv = 0;
791 break;
792 }
793
794 case IPV6_MULTICAST_IF:
795 if (sk->sk_type == SOCK_STREAM)
796 break;
797 if (optlen < sizeof(int))
798 goto e_inval;
799
800 if (val) {
801 struct net_device *dev;
802 int midx;
803
804 rcu_read_lock();
805
806 dev = dev_get_by_index_rcu(net, val);
807 if (!dev) {
808 rcu_read_unlock();
809 retv = -ENODEV;
810 break;
811 }
812 midx = l3mdev_master_ifindex_rcu(dev);
813
814 rcu_read_unlock();
815
816 if (sk->sk_bound_dev_if &&
817 sk->sk_bound_dev_if != val &&
818 (!midx || midx != sk->sk_bound_dev_if))
819 goto e_inval;
820 }
821 np->mcast_oif = val;
822 retv = 0;
823 break;
824 case IPV6_ADD_MEMBERSHIP:
825 case IPV6_DROP_MEMBERSHIP:
826 {
827 struct ipv6_mreq mreq;
828
829 if (optlen < sizeof(struct ipv6_mreq))
830 goto e_inval;
831
832 retv = -EPROTO;
833 if (inet_test_bit(IS_ICSK, sk))
834 break;
835
836 retv = -EFAULT;
837 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
838 break;
839
840 if (optname == IPV6_ADD_MEMBERSHIP)
841 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
842 else
843 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
844 break;
845 }
846 case IPV6_JOIN_ANYCAST:
847 case IPV6_LEAVE_ANYCAST:
848 {
849 struct ipv6_mreq mreq;
850
851 if (optlen < sizeof(struct ipv6_mreq))
852 goto e_inval;
853
854 retv = -EFAULT;
855 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
856 break;
857
858 if (optname == IPV6_JOIN_ANYCAST)
859 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
860 else
861 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
862 break;
863 }
864 case IPV6_MULTICAST_ALL:
865 if (optlen < sizeof(int))
866 goto e_inval;
867 np->mc_all = valbool;
868 retv = 0;
869 break;
870
871 case MCAST_JOIN_GROUP:
872 case MCAST_LEAVE_GROUP:
873 if (in_compat_syscall())
874 retv = compat_ipv6_mcast_join_leave(sk, optname, optval,
875 optlen);
876 else
877 retv = ipv6_mcast_join_leave(sk, optname, optval,
878 optlen);
879 break;
880 case MCAST_JOIN_SOURCE_GROUP:
881 case MCAST_LEAVE_SOURCE_GROUP:
882 case MCAST_BLOCK_SOURCE:
883 case MCAST_UNBLOCK_SOURCE:
884 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen);
885 break;
886 case MCAST_MSFILTER:
887 if (in_compat_syscall())
888 retv = compat_ipv6_set_mcast_msfilter(sk, optval,
889 optlen);
890 else
891 retv = ipv6_set_mcast_msfilter(sk, optval, optlen);
892 break;
893 case IPV6_ROUTER_ALERT:
894 if (optlen < sizeof(int))
895 goto e_inval;
896 retv = ip6_ra_control(sk, val);
897 break;
898 case IPV6_ROUTER_ALERT_ISOLATE:
899 if (optlen < sizeof(int))
900 goto e_inval;
901 np->rtalert_isolate = valbool;
902 retv = 0;
903 break;
904 case IPV6_MTU_DISCOVER:
905 if (optlen < sizeof(int))
906 goto e_inval;
907 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
908 goto e_inval;
909 np->pmtudisc = val;
910 retv = 0;
911 break;
912 case IPV6_MTU:
913 if (optlen < sizeof(int))
914 goto e_inval;
915 if (val && val < IPV6_MIN_MTU)
916 goto e_inval;
917 np->frag_size = val;
918 retv = 0;
919 break;
920 case IPV6_RECVERR:
921 if (optlen < sizeof(int))
922 goto e_inval;
923 np->recverr = valbool;
924 if (!val)
925 skb_errqueue_purge(&sk->sk_error_queue);
926 retv = 0;
927 break;
928 case IPV6_FLOWINFO_SEND:
929 if (optlen < sizeof(int))
930 goto e_inval;
931 np->sndflow = valbool;
932 retv = 0;
933 break;
934 case IPV6_FLOWLABEL_MGR:
935 retv = ipv6_flowlabel_opt(sk, optval, optlen);
936 break;
937 case IPV6_IPSEC_POLICY:
938 case IPV6_XFRM_POLICY:
939 retv = -EPERM;
940 if (!sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN))
941 break;
942 retv = xfrm_user_policy(sk, optname, optval, optlen);
943 break;
944
945 case IPV6_ADDR_PREFERENCES:
946 if (optlen < sizeof(int))
947 goto e_inval;
948 retv = __ip6_sock_set_addr_preferences(sk, val);
949 break;
950 case IPV6_MINHOPCOUNT:
951 if (optlen < sizeof(int))
952 goto e_inval;
953 if (val < 0 || val > 255)
954 goto e_inval;
955
956 if (val)
957 static_branch_enable(&ip6_min_hopcount);
958
959 /* tcp_v6_err() and tcp_v6_rcv() might read min_hopcount
960 * while we are changing it.
961 */
962 WRITE_ONCE(np->min_hopcount, val);
963 retv = 0;
964 break;
965 case IPV6_DONTFRAG:
966 np->dontfrag = valbool;
967 retv = 0;
968 break;
969 case IPV6_AUTOFLOWLABEL:
970 np->autoflowlabel = valbool;
971 np->autoflowlabel_set = 1;
972 retv = 0;
973 break;
974 case IPV6_RECVFRAGSIZE:
975 np->rxopt.bits.recvfragsize = valbool;
976 retv = 0;
977 break;
978 case IPV6_RECVERR_RFC4884:
979 if (optlen < sizeof(int))
980 goto e_inval;
981 if (val < 0 || val > 1)
982 goto e_inval;
983 np->recverr_rfc4884 = valbool;
984 retv = 0;
985 break;
986 }
987
988 unlock:
989 sockopt_release_sock(sk);
990 if (needs_rtnl)
991 rtnl_unlock();
992
993 return retv;
994
995 e_inval:
996 retv = -EINVAL;
997 goto unlock;
998 }
999
ipv6_setsockopt(struct sock * sk,int level,int optname,sockptr_t optval,unsigned int optlen)1000 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1001 unsigned int optlen)
1002 {
1003 int err;
1004
1005 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1006 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
1007
1008 if (level != SOL_IPV6)
1009 return -ENOPROTOOPT;
1010
1011 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
1012 #ifdef CONFIG_NETFILTER
1013 /* we need to exclude all possible ENOPROTOOPTs except default case */
1014 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
1015 optname != IPV6_XFRM_POLICY)
1016 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
1017 #endif
1018 return err;
1019 }
1020 EXPORT_SYMBOL(ipv6_setsockopt);
1021
ipv6_getsockopt_sticky(struct sock * sk,struct ipv6_txoptions * opt,int optname,sockptr_t optval,int len)1022 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
1023 int optname, sockptr_t optval, int len)
1024 {
1025 struct ipv6_opt_hdr *hdr;
1026
1027 if (!opt)
1028 return 0;
1029
1030 switch (optname) {
1031 case IPV6_HOPOPTS:
1032 hdr = opt->hopopt;
1033 break;
1034 case IPV6_RTHDRDSTOPTS:
1035 hdr = opt->dst0opt;
1036 break;
1037 case IPV6_RTHDR:
1038 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1039 break;
1040 case IPV6_DSTOPTS:
1041 hdr = opt->dst1opt;
1042 break;
1043 default:
1044 return -EINVAL; /* should not happen */
1045 }
1046
1047 if (!hdr)
1048 return 0;
1049
1050 len = min_t(unsigned int, len, ipv6_optlen(hdr));
1051 if (copy_to_sockptr(optval, hdr, len))
1052 return -EFAULT;
1053 return len;
1054 }
1055
ipv6_get_msfilter(struct sock * sk,sockptr_t optval,sockptr_t optlen,int len)1056 static int ipv6_get_msfilter(struct sock *sk, sockptr_t optval,
1057 sockptr_t optlen, int len)
1058 {
1059 const int size0 = offsetof(struct group_filter, gf_slist_flex);
1060 struct group_filter gsf;
1061 int num;
1062 int err;
1063
1064 if (len < size0)
1065 return -EINVAL;
1066 if (copy_from_sockptr(&gsf, optval, size0))
1067 return -EFAULT;
1068 if (gsf.gf_group.ss_family != AF_INET6)
1069 return -EADDRNOTAVAIL;
1070 num = gsf.gf_numsrc;
1071 sockopt_lock_sock(sk);
1072 err = ip6_mc_msfget(sk, &gsf, optval, size0);
1073 if (!err) {
1074 if (num > gsf.gf_numsrc)
1075 num = gsf.gf_numsrc;
1076 len = GROUP_FILTER_SIZE(num);
1077 if (copy_to_sockptr(optlen, &len, sizeof(int)) ||
1078 copy_to_sockptr(optval, &gsf, size0))
1079 err = -EFAULT;
1080 }
1081 sockopt_release_sock(sk);
1082 return err;
1083 }
1084
compat_ipv6_get_msfilter(struct sock * sk,sockptr_t optval,sockptr_t optlen,int len)1085 static int compat_ipv6_get_msfilter(struct sock *sk, sockptr_t optval,
1086 sockptr_t optlen, int len)
1087 {
1088 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
1089 struct compat_group_filter gf32;
1090 struct group_filter gf;
1091 int err;
1092 int num;
1093
1094 if (len < size0)
1095 return -EINVAL;
1096
1097 if (copy_from_sockptr(&gf32, optval, size0))
1098 return -EFAULT;
1099 gf.gf_interface = gf32.gf_interface;
1100 gf.gf_fmode = gf32.gf_fmode;
1101 num = gf.gf_numsrc = gf32.gf_numsrc;
1102 gf.gf_group = gf32.gf_group;
1103
1104 if (gf.gf_group.ss_family != AF_INET6)
1105 return -EADDRNOTAVAIL;
1106
1107 sockopt_lock_sock(sk);
1108 err = ip6_mc_msfget(sk, &gf, optval, size0);
1109 sockopt_release_sock(sk);
1110 if (err)
1111 return err;
1112 if (num > gf.gf_numsrc)
1113 num = gf.gf_numsrc;
1114 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32));
1115 if (copy_to_sockptr(optlen, &len, sizeof(int)) ||
1116 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_fmode),
1117 &gf.gf_fmode, sizeof(gf32.gf_fmode)) ||
1118 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_numsrc),
1119 &gf.gf_numsrc, sizeof(gf32.gf_numsrc)))
1120 return -EFAULT;
1121 return 0;
1122 }
1123
do_ipv6_getsockopt(struct sock * sk,int level,int optname,sockptr_t optval,sockptr_t optlen)1124 int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1125 sockptr_t optval, sockptr_t optlen)
1126 {
1127 struct ipv6_pinfo *np = inet6_sk(sk);
1128 int len;
1129 int val;
1130
1131 if (ip6_mroute_opt(optname))
1132 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1133
1134 if (copy_from_sockptr(&len, optlen, sizeof(int)))
1135 return -EFAULT;
1136 switch (optname) {
1137 case IPV6_ADDRFORM:
1138 if (sk->sk_protocol != IPPROTO_UDP &&
1139 sk->sk_protocol != IPPROTO_UDPLITE &&
1140 sk->sk_protocol != IPPROTO_TCP)
1141 return -ENOPROTOOPT;
1142 if (sk->sk_state != TCP_ESTABLISHED)
1143 return -ENOTCONN;
1144 val = sk->sk_family;
1145 break;
1146 case MCAST_MSFILTER:
1147 if (in_compat_syscall())
1148 return compat_ipv6_get_msfilter(sk, optval, optlen, len);
1149 return ipv6_get_msfilter(sk, optval, optlen, len);
1150 case IPV6_2292PKTOPTIONS:
1151 {
1152 struct msghdr msg;
1153 struct sk_buff *skb;
1154
1155 if (sk->sk_type != SOCK_STREAM)
1156 return -ENOPROTOOPT;
1157
1158 if (optval.is_kernel) {
1159 msg.msg_control_is_user = false;
1160 msg.msg_control = optval.kernel;
1161 } else {
1162 msg.msg_control_is_user = true;
1163 msg.msg_control_user = optval.user;
1164 }
1165 msg.msg_controllen = len;
1166 msg.msg_flags = 0;
1167
1168 sockopt_lock_sock(sk);
1169 skb = np->pktoptions;
1170 if (skb)
1171 ip6_datagram_recv_ctl(sk, &msg, skb);
1172 sockopt_release_sock(sk);
1173 if (!skb) {
1174 if (np->rxopt.bits.rxinfo) {
1175 struct in6_pktinfo src_info;
1176 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1177 np->sticky_pktinfo.ipi6_ifindex;
1178 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1179 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1180 }
1181 if (np->rxopt.bits.rxhlim) {
1182 int hlim = np->mcast_hops;
1183 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1184 }
1185 if (np->rxopt.bits.rxtclass) {
1186 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1187
1188 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1189 }
1190 if (np->rxopt.bits.rxoinfo) {
1191 struct in6_pktinfo src_info;
1192 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1193 np->sticky_pktinfo.ipi6_ifindex;
1194 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1195 np->sticky_pktinfo.ipi6_addr;
1196 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1197 }
1198 if (np->rxopt.bits.rxohlim) {
1199 int hlim = np->mcast_hops;
1200 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1201 }
1202 if (np->rxopt.bits.rxflow) {
1203 __be32 flowinfo = np->rcv_flowinfo;
1204
1205 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1206 }
1207 }
1208 len -= msg.msg_controllen;
1209 return copy_to_sockptr(optlen, &len, sizeof(int));
1210 }
1211 case IPV6_MTU:
1212 {
1213 struct dst_entry *dst;
1214
1215 val = 0;
1216 rcu_read_lock();
1217 dst = __sk_dst_get(sk);
1218 if (dst)
1219 val = dst_mtu(dst);
1220 rcu_read_unlock();
1221 if (!val)
1222 return -ENOTCONN;
1223 break;
1224 }
1225
1226 case IPV6_V6ONLY:
1227 val = sk->sk_ipv6only;
1228 break;
1229
1230 case IPV6_RECVPKTINFO:
1231 val = np->rxopt.bits.rxinfo;
1232 break;
1233
1234 case IPV6_2292PKTINFO:
1235 val = np->rxopt.bits.rxoinfo;
1236 break;
1237
1238 case IPV6_RECVHOPLIMIT:
1239 val = np->rxopt.bits.rxhlim;
1240 break;
1241
1242 case IPV6_2292HOPLIMIT:
1243 val = np->rxopt.bits.rxohlim;
1244 break;
1245
1246 case IPV6_RECVRTHDR:
1247 val = np->rxopt.bits.srcrt;
1248 break;
1249
1250 case IPV6_2292RTHDR:
1251 val = np->rxopt.bits.osrcrt;
1252 break;
1253
1254 case IPV6_HOPOPTS:
1255 case IPV6_RTHDRDSTOPTS:
1256 case IPV6_RTHDR:
1257 case IPV6_DSTOPTS:
1258 {
1259 struct ipv6_txoptions *opt;
1260
1261 sockopt_lock_sock(sk);
1262 opt = rcu_dereference_protected(np->opt,
1263 lockdep_sock_is_held(sk));
1264 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1265 sockopt_release_sock(sk);
1266 /* check if ipv6_getsockopt_sticky() returns err code */
1267 if (len < 0)
1268 return len;
1269 return copy_to_sockptr(optlen, &len, sizeof(int));
1270 }
1271
1272 case IPV6_RECVHOPOPTS:
1273 val = np->rxopt.bits.hopopts;
1274 break;
1275
1276 case IPV6_2292HOPOPTS:
1277 val = np->rxopt.bits.ohopopts;
1278 break;
1279
1280 case IPV6_RECVDSTOPTS:
1281 val = np->rxopt.bits.dstopts;
1282 break;
1283
1284 case IPV6_2292DSTOPTS:
1285 val = np->rxopt.bits.odstopts;
1286 break;
1287
1288 case IPV6_TCLASS:
1289 val = np->tclass;
1290 break;
1291
1292 case IPV6_RECVTCLASS:
1293 val = np->rxopt.bits.rxtclass;
1294 break;
1295
1296 case IPV6_FLOWINFO:
1297 val = np->rxopt.bits.rxflow;
1298 break;
1299
1300 case IPV6_RECVPATHMTU:
1301 val = np->rxopt.bits.rxpmtu;
1302 break;
1303
1304 case IPV6_PATHMTU:
1305 {
1306 struct dst_entry *dst;
1307 struct ip6_mtuinfo mtuinfo;
1308
1309 if (len < sizeof(mtuinfo))
1310 return -EINVAL;
1311
1312 len = sizeof(mtuinfo);
1313 memset(&mtuinfo, 0, sizeof(mtuinfo));
1314
1315 rcu_read_lock();
1316 dst = __sk_dst_get(sk);
1317 if (dst)
1318 mtuinfo.ip6m_mtu = dst_mtu(dst);
1319 rcu_read_unlock();
1320 if (!mtuinfo.ip6m_mtu)
1321 return -ENOTCONN;
1322
1323 if (copy_to_sockptr(optlen, &len, sizeof(int)))
1324 return -EFAULT;
1325 if (copy_to_sockptr(optval, &mtuinfo, len))
1326 return -EFAULT;
1327
1328 return 0;
1329 }
1330
1331 case IPV6_TRANSPARENT:
1332 val = inet_test_bit(TRANSPARENT, sk);
1333 break;
1334
1335 case IPV6_FREEBIND:
1336 val = inet_test_bit(FREEBIND, sk);
1337 break;
1338
1339 case IPV6_RECVORIGDSTADDR:
1340 val = np->rxopt.bits.rxorigdstaddr;
1341 break;
1342
1343 case IPV6_UNICAST_HOPS:
1344 case IPV6_MULTICAST_HOPS:
1345 {
1346 struct dst_entry *dst;
1347
1348 if (optname == IPV6_UNICAST_HOPS)
1349 val = np->hop_limit;
1350 else
1351 val = np->mcast_hops;
1352
1353 if (val < 0) {
1354 rcu_read_lock();
1355 dst = __sk_dst_get(sk);
1356 if (dst)
1357 val = ip6_dst_hoplimit(dst);
1358 rcu_read_unlock();
1359 }
1360
1361 if (val < 0)
1362 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1363 break;
1364 }
1365
1366 case IPV6_MULTICAST_LOOP:
1367 val = np->mc_loop;
1368 break;
1369
1370 case IPV6_MULTICAST_IF:
1371 val = np->mcast_oif;
1372 break;
1373
1374 case IPV6_MULTICAST_ALL:
1375 val = np->mc_all;
1376 break;
1377
1378 case IPV6_UNICAST_IF:
1379 val = (__force int)htonl((__u32) np->ucast_oif);
1380 break;
1381
1382 case IPV6_MTU_DISCOVER:
1383 val = np->pmtudisc;
1384 break;
1385
1386 case IPV6_RECVERR:
1387 val = np->recverr;
1388 break;
1389
1390 case IPV6_FLOWINFO_SEND:
1391 val = np->sndflow;
1392 break;
1393
1394 case IPV6_FLOWLABEL_MGR:
1395 {
1396 struct in6_flowlabel_req freq;
1397 int flags;
1398
1399 if (len < sizeof(freq))
1400 return -EINVAL;
1401
1402 if (copy_from_sockptr(&freq, optval, sizeof(freq)))
1403 return -EFAULT;
1404
1405 if (freq.flr_action != IPV6_FL_A_GET)
1406 return -EINVAL;
1407
1408 len = sizeof(freq);
1409 flags = freq.flr_flags;
1410
1411 memset(&freq, 0, sizeof(freq));
1412
1413 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1414 if (val < 0)
1415 return val;
1416
1417 if (copy_to_sockptr(optlen, &len, sizeof(int)))
1418 return -EFAULT;
1419 if (copy_to_sockptr(optval, &freq, len))
1420 return -EFAULT;
1421
1422 return 0;
1423 }
1424
1425 case IPV6_ADDR_PREFERENCES:
1426 val = 0;
1427
1428 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1429 val |= IPV6_PREFER_SRC_TMP;
1430 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1431 val |= IPV6_PREFER_SRC_PUBLIC;
1432 else {
1433 /* XXX: should we return system default? */
1434 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1435 }
1436
1437 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1438 val |= IPV6_PREFER_SRC_COA;
1439 else
1440 val |= IPV6_PREFER_SRC_HOME;
1441 break;
1442
1443 case IPV6_MINHOPCOUNT:
1444 val = np->min_hopcount;
1445 break;
1446
1447 case IPV6_DONTFRAG:
1448 val = np->dontfrag;
1449 break;
1450
1451 case IPV6_AUTOFLOWLABEL:
1452 val = ip6_autoflowlabel(sock_net(sk), np);
1453 break;
1454
1455 case IPV6_RECVFRAGSIZE:
1456 val = np->rxopt.bits.recvfragsize;
1457 break;
1458
1459 case IPV6_ROUTER_ALERT_ISOLATE:
1460 val = np->rtalert_isolate;
1461 break;
1462
1463 case IPV6_RECVERR_RFC4884:
1464 val = np->recverr_rfc4884;
1465 break;
1466
1467 default:
1468 return -ENOPROTOOPT;
1469 }
1470 len = min_t(unsigned int, sizeof(int), len);
1471 if (copy_to_sockptr(optlen, &len, sizeof(int)))
1472 return -EFAULT;
1473 if (copy_to_sockptr(optval, &val, len))
1474 return -EFAULT;
1475 return 0;
1476 }
1477
ipv6_getsockopt(struct sock * sk,int level,int optname,char __user * optval,int __user * optlen)1478 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1479 char __user *optval, int __user *optlen)
1480 {
1481 int err;
1482
1483 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1484 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1485
1486 if (level != SOL_IPV6)
1487 return -ENOPROTOOPT;
1488
1489 err = do_ipv6_getsockopt(sk, level, optname,
1490 USER_SOCKPTR(optval), USER_SOCKPTR(optlen));
1491 #ifdef CONFIG_NETFILTER
1492 /* we need to exclude all possible ENOPROTOOPTs except default case */
1493 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1494 int len;
1495
1496 if (get_user(len, optlen))
1497 return -EFAULT;
1498
1499 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1500 if (err >= 0)
1501 err = put_user(len, optlen);
1502 }
1503 #endif
1504 return err;
1505 }
1506 EXPORT_SYMBOL(ipv6_getsockopt);
1507