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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
55struct ip6_ra_chain *ip6_ra_chain;
56DEFINE_RWLOCK(ip6_ra_lock);
57
58DEFINE_STATIC_KEY_FALSE(ip6_min_hopcount);
59
60int 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
102struct 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 = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
115 opt);
116 sk_dst_reset(sk);
117
118 return opt;
119}
120
121static bool setsockopt_needs_rtnl(int optname)
122{
123 switch (optname) {
124 case IPV6_ADDRFORM:
125 case IPV6_ADD_MEMBERSHIP:
126 case IPV6_DROP_MEMBERSHIP:
127 case IPV6_JOIN_ANYCAST:
128 case IPV6_LEAVE_ANYCAST:
129 case MCAST_JOIN_GROUP:
130 case MCAST_LEAVE_GROUP:
131 case MCAST_JOIN_SOURCE_GROUP:
132 case MCAST_LEAVE_SOURCE_GROUP:
133 case MCAST_BLOCK_SOURCE:
134 case MCAST_UNBLOCK_SOURCE:
135 case MCAST_MSFILTER:
136 return true;
137 }
138 return false;
139}
140
141static int copy_group_source_from_sockptr(struct group_source_req *greqs,
142 sockptr_t optval, int optlen)
143{
144 if (in_compat_syscall()) {
145 struct compat_group_source_req gr32;
146
147 if (optlen < sizeof(gr32))
148 return -EINVAL;
149 if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
150 return -EFAULT;
151 greqs->gsr_interface = gr32.gsr_interface;
152 greqs->gsr_group = gr32.gsr_group;
153 greqs->gsr_source = gr32.gsr_source;
154 } else {
155 if (optlen < sizeof(*greqs))
156 return -EINVAL;
157 if (copy_from_sockptr(greqs, optval, sizeof(*greqs)))
158 return -EFAULT;
159 }
160
161 return 0;
162}
163
164static int do_ipv6_mcast_group_source(struct sock *sk, int optname,
165 sockptr_t optval, int optlen)
166{
167 struct group_source_req greqs;
168 int omode, add;
169 int ret;
170
171 ret = copy_group_source_from_sockptr(&greqs, optval, optlen);
172 if (ret)
173 return ret;
174
175 if (greqs.gsr_group.ss_family != AF_INET6 ||
176 greqs.gsr_source.ss_family != AF_INET6)
177 return -EADDRNOTAVAIL;
178
179 if (optname == MCAST_BLOCK_SOURCE) {
180 omode = MCAST_EXCLUDE;
181 add = 1;
182 } else if (optname == MCAST_UNBLOCK_SOURCE) {
183 omode = MCAST_EXCLUDE;
184 add = 0;
185 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
186 struct sockaddr_in6 *psin6;
187 int retv;
188
189 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
190 retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
191 &psin6->sin6_addr,
192 MCAST_INCLUDE);
193 /* prior join w/ different source is ok */
194 if (retv && retv != -EADDRINUSE)
195 return retv;
196 omode = MCAST_INCLUDE;
197 add = 1;
198 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
199 omode = MCAST_INCLUDE;
200 add = 0;
201 }
202 return ip6_mc_source(add, omode, sk, &greqs);
203}
204
205static int ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
206 int optlen)
207{
208 struct group_filter *gsf;
209 int ret;
210
211 if (optlen < GROUP_FILTER_SIZE(0))
212 return -EINVAL;
213 if (optlen > READ_ONCE(sock_net(sk)->core.sysctl_optmem_max))
214 return -ENOBUFS;
215
216 gsf = memdup_sockptr(optval, optlen);
217 if (IS_ERR(gsf))
218 return PTR_ERR(gsf);
219
220 /* numsrc >= (4G-140)/128 overflow in 32 bits */
221 ret = -ENOBUFS;
222 if (gsf->gf_numsrc >= 0x1ffffffU ||
223 gsf->gf_numsrc > sysctl_mld_max_msf)
224 goto out_free_gsf;
225
226 ret = -EINVAL;
227 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen)
228 goto out_free_gsf;
229
230 ret = ip6_mc_msfilter(sk, gsf, gsf->gf_slist_flex);
231out_free_gsf:
232 kfree(gsf);
233 return ret;
234}
235
236static int compat_ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
237 int optlen)
238{
239 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
240 struct compat_group_filter *gf32;
241 void *p;
242 int ret;
243 int n;
244
245 if (optlen < size0)
246 return -EINVAL;
247 if (optlen > READ_ONCE(sock_net(sk)->core.sysctl_optmem_max) - 4)
248 return -ENOBUFS;
249
250 p = kmalloc(optlen + 4, GFP_KERNEL);
251 if (!p)
252 return -ENOMEM;
253
254 gf32 = p + 4; /* we want ->gf_group and ->gf_slist_flex aligned */
255 ret = -EFAULT;
256 if (copy_from_sockptr(gf32, optval, optlen))
257 goto out_free_p;
258
259 /* numsrc >= (4G-140)/128 overflow in 32 bits */
260 ret = -ENOBUFS;
261 n = gf32->gf_numsrc;
262 if (n >= 0x1ffffffU || n > sysctl_mld_max_msf)
263 goto out_free_p;
264
265 ret = -EINVAL;
266 if (offsetof(struct compat_group_filter, gf_slist_flex[n]) > optlen)
267 goto out_free_p;
268
269 ret = ip6_mc_msfilter(sk, &(struct group_filter){
270 .gf_interface = gf32->gf_interface,
271 .gf_group = gf32->gf_group,
272 .gf_fmode = gf32->gf_fmode,
273 .gf_numsrc = gf32->gf_numsrc}, gf32->gf_slist_flex);
274
275out_free_p:
276 kfree(p);
277 return ret;
278}
279
280static int ipv6_mcast_join_leave(struct sock *sk, int optname,
281 sockptr_t optval, int optlen)
282{
283 struct sockaddr_in6 *psin6;
284 struct group_req greq;
285
286 if (optlen < sizeof(greq))
287 return -EINVAL;
288 if (copy_from_sockptr(&greq, optval, sizeof(greq)))
289 return -EFAULT;
290
291 if (greq.gr_group.ss_family != AF_INET6)
292 return -EADDRNOTAVAIL;
293 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
294 if (optname == MCAST_JOIN_GROUP)
295 return ipv6_sock_mc_join(sk, greq.gr_interface,
296 &psin6->sin6_addr);
297 return ipv6_sock_mc_drop(sk, greq.gr_interface, &psin6->sin6_addr);
298}
299
300static int compat_ipv6_mcast_join_leave(struct sock *sk, int optname,
301 sockptr_t optval, int optlen)
302{
303 struct compat_group_req gr32;
304 struct sockaddr_in6 *psin6;
305
306 if (optlen < sizeof(gr32))
307 return -EINVAL;
308 if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
309 return -EFAULT;
310
311 if (gr32.gr_group.ss_family != AF_INET6)
312 return -EADDRNOTAVAIL;
313 psin6 = (struct sockaddr_in6 *)&gr32.gr_group;
314 if (optname == MCAST_JOIN_GROUP)
315 return ipv6_sock_mc_join(sk, gr32.gr_interface,
316 &psin6->sin6_addr);
317 return ipv6_sock_mc_drop(sk, gr32.gr_interface, &psin6->sin6_addr);
318}
319
320static int ipv6_set_opt_hdr(struct sock *sk, int optname, sockptr_t optval,
321 int optlen)
322{
323 struct ipv6_pinfo *np = inet6_sk(sk);
324 struct ipv6_opt_hdr *new = NULL;
325 struct net *net = sock_net(sk);
326 struct ipv6_txoptions *opt;
327 int err;
328
329 /* hop-by-hop / destination options are privileged option */
330 if (optname != IPV6_RTHDR && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW))
331 return -EPERM;
332
333 /* remove any sticky options header with a zero option
334 * length, per RFC3542.
335 */
336 if (optlen > 0) {
337 if (sockptr_is_null(optval))
338 return -EINVAL;
339 if (optlen < sizeof(struct ipv6_opt_hdr) ||
340 optlen & 0x7 ||
341 optlen > 8 * 255)
342 return -EINVAL;
343
344 new = memdup_sockptr(optval, optlen);
345 if (IS_ERR(new))
346 return PTR_ERR(new);
347 if (unlikely(ipv6_optlen(new) > optlen)) {
348 kfree(new);
349 return -EINVAL;
350 }
351 }
352
353 opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk));
354 opt = ipv6_renew_options(sk, opt, optname, new);
355 kfree(new);
356 if (IS_ERR(opt))
357 return PTR_ERR(opt);
358
359 /* routing header option needs extra check */
360 err = -EINVAL;
361 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
362 struct ipv6_rt_hdr *rthdr = opt->srcrt;
363 switch (rthdr->type) {
364#if IS_ENABLED(CONFIG_IPV6_MIP6)
365 case IPV6_SRCRT_TYPE_2:
366 if (rthdr->hdrlen != 2 || rthdr->segments_left != 1)
367 goto sticky_done;
368 break;
369#endif
370 case IPV6_SRCRT_TYPE_4:
371 {
372 struct ipv6_sr_hdr *srh =
373 (struct ipv6_sr_hdr *)opt->srcrt;
374
375 if (!seg6_validate_srh(srh, optlen, false))
376 goto sticky_done;
377 break;
378 }
379 default:
380 goto sticky_done;
381 }
382 }
383
384 err = 0;
385 opt = ipv6_update_options(sk, opt);
386sticky_done:
387 if (opt) {
388 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
389 txopt_put(opt);
390 }
391 return err;
392}
393
394int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
395 sockptr_t optval, unsigned int optlen)
396{
397 struct ipv6_pinfo *np = inet6_sk(sk);
398 struct net *net = sock_net(sk);
399 int val, valbool;
400 int retv = -ENOPROTOOPT;
401 bool needs_rtnl = setsockopt_needs_rtnl(optname);
402
403 if (sockptr_is_null(optval))
404 val = 0;
405 else {
406 if (optlen >= sizeof(int)) {
407 if (copy_from_sockptr(&val, optval, sizeof(val)))
408 return -EFAULT;
409 } else
410 val = 0;
411 }
412
413 valbool = (val != 0);
414
415 if (ip6_mroute_opt(optname))
416 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
417
418 /* Handle options that can be set without locking the socket. */
419 switch (optname) {
420 case IPV6_UNICAST_HOPS:
421 if (optlen < sizeof(int))
422 return -EINVAL;
423 if (val > 255 || val < -1)
424 return -EINVAL;
425 WRITE_ONCE(np->hop_limit, val);
426 return 0;
427 case IPV6_MULTICAST_LOOP:
428 if (optlen < sizeof(int))
429 return -EINVAL;
430 if (val != valbool)
431 return -EINVAL;
432 inet6_assign_bit(MC6_LOOP, sk, valbool);
433 return 0;
434 case IPV6_MULTICAST_HOPS:
435 if (sk->sk_type == SOCK_STREAM)
436 return retv;
437 if (optlen < sizeof(int))
438 return -EINVAL;
439 if (val > 255 || val < -1)
440 return -EINVAL;
441 WRITE_ONCE(np->mcast_hops,
442 val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
443 return 0;
444 case IPV6_MTU:
445 if (optlen < sizeof(int))
446 return -EINVAL;
447 if (val && val < IPV6_MIN_MTU)
448 return -EINVAL;
449 WRITE_ONCE(np->frag_size, val);
450 return 0;
451 case IPV6_MINHOPCOUNT:
452 if (optlen < sizeof(int))
453 return -EINVAL;
454 if (val < 0 || val > 255)
455 return -EINVAL;
456
457 if (val)
458 static_branch_enable(&ip6_min_hopcount);
459
460 /* tcp_v6_err() and tcp_v6_rcv() might read min_hopcount
461 * while we are changing it.
462 */
463 WRITE_ONCE(np->min_hopcount, val);
464 return 0;
465 case IPV6_RECVERR_RFC4884:
466 if (optlen < sizeof(int))
467 return -EINVAL;
468 if (val < 0 || val > 1)
469 return -EINVAL;
470 inet6_assign_bit(RECVERR6_RFC4884, sk, valbool);
471 return 0;
472 case IPV6_MULTICAST_ALL:
473 if (optlen < sizeof(int))
474 return -EINVAL;
475 inet6_assign_bit(MC6_ALL, sk, valbool);
476 return 0;
477 case IPV6_AUTOFLOWLABEL:
478 inet6_assign_bit(AUTOFLOWLABEL, sk, valbool);
479 inet6_set_bit(AUTOFLOWLABEL_SET, sk);
480 return 0;
481 case IPV6_DONTFRAG:
482 inet6_assign_bit(DONTFRAG, sk, valbool);
483 return 0;
484 case IPV6_RECVERR:
485 if (optlen < sizeof(int))
486 return -EINVAL;
487 inet6_assign_bit(RECVERR6, sk, valbool);
488 if (!val)
489 skb_errqueue_purge(&sk->sk_error_queue);
490 return 0;
491 case IPV6_ROUTER_ALERT_ISOLATE:
492 if (optlen < sizeof(int))
493 return -EINVAL;
494 inet6_assign_bit(RTALERT_ISOLATE, sk, valbool);
495 return 0;
496 case IPV6_MTU_DISCOVER:
497 if (optlen < sizeof(int))
498 return -EINVAL;
499 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
500 return -EINVAL;
501 WRITE_ONCE(np->pmtudisc, val);
502 return 0;
503 case IPV6_FLOWINFO_SEND:
504 if (optlen < sizeof(int))
505 return -EINVAL;
506 inet6_assign_bit(SNDFLOW, sk, valbool);
507 return 0;
508 case IPV6_ADDR_PREFERENCES:
509 if (optlen < sizeof(int))
510 return -EINVAL;
511 return ip6_sock_set_addr_preferences(sk, val);
512 case IPV6_MULTICAST_IF:
513 if (sk->sk_type == SOCK_STREAM)
514 return -ENOPROTOOPT;
515 if (optlen < sizeof(int))
516 return -EINVAL;
517 if (val) {
518 struct net_device *dev;
519 int bound_dev_if, midx;
520
521 rcu_read_lock();
522
523 dev = dev_get_by_index_rcu(net, val);
524 if (!dev) {
525 rcu_read_unlock();
526 return -ENODEV;
527 }
528 midx = l3mdev_master_ifindex_rcu(dev);
529
530 rcu_read_unlock();
531
532 bound_dev_if = READ_ONCE(sk->sk_bound_dev_if);
533 if (bound_dev_if &&
534 bound_dev_if != val &&
535 (!midx || midx != bound_dev_if))
536 return -EINVAL;
537 }
538 WRITE_ONCE(np->mcast_oif, val);
539 return 0;
540 case IPV6_UNICAST_IF:
541 {
542 struct net_device *dev;
543 int ifindex;
544
545 if (optlen != sizeof(int))
546 return -EINVAL;
547
548 ifindex = (__force int)ntohl((__force __be32)val);
549 if (!ifindex) {
550 WRITE_ONCE(np->ucast_oif, 0);
551 return 0;
552 }
553
554 dev = dev_get_by_index(net, ifindex);
555 if (!dev)
556 return -EADDRNOTAVAIL;
557 dev_put(dev);
558
559 if (READ_ONCE(sk->sk_bound_dev_if))
560 return -EINVAL;
561
562 WRITE_ONCE(np->ucast_oif, ifindex);
563 return 0;
564 }
565 }
566 if (needs_rtnl)
567 rtnl_lock();
568 sockopt_lock_sock(sk);
569
570 /* Another thread has converted the socket into IPv4 with
571 * IPV6_ADDRFORM concurrently.
572 */
573 if (unlikely(sk->sk_family != AF_INET6))
574 goto unlock;
575
576 switch (optname) {
577
578 case IPV6_ADDRFORM:
579 if (optlen < sizeof(int))
580 goto e_inval;
581 if (val == PF_INET) {
582 if (sk->sk_type == SOCK_RAW)
583 break;
584
585 if (sk->sk_protocol == IPPROTO_UDP ||
586 sk->sk_protocol == IPPROTO_UDPLITE) {
587 struct udp_sock *up = udp_sk(sk);
588 if (up->pending == AF_INET6) {
589 retv = -EBUSY;
590 break;
591 }
592 } else if (sk->sk_protocol == IPPROTO_TCP) {
593 if (sk->sk_prot != &tcpv6_prot) {
594 retv = -EBUSY;
595 break;
596 }
597 } else {
598 break;
599 }
600
601 if (sk->sk_state != TCP_ESTABLISHED) {
602 retv = -ENOTCONN;
603 break;
604 }
605
606 if (ipv6_only_sock(sk) ||
607 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
608 retv = -EADDRNOTAVAIL;
609 break;
610 }
611
612 __ipv6_sock_mc_close(sk);
613 __ipv6_sock_ac_close(sk);
614
615 if (sk->sk_protocol == IPPROTO_TCP) {
616 struct inet_connection_sock *icsk = inet_csk(sk);
617
618 sock_prot_inuse_add(net, sk->sk_prot, -1);
619 sock_prot_inuse_add(net, &tcp_prot, 1);
620
621 /* Paired with READ_ONCE(sk->sk_prot) in inet6_stream_ops */
622 WRITE_ONCE(sk->sk_prot, &tcp_prot);
623 /* Paired with READ_ONCE() in tcp_(get|set)sockopt() */
624 WRITE_ONCE(icsk->icsk_af_ops, &ipv4_specific);
625 WRITE_ONCE(sk->sk_socket->ops, &inet_stream_ops);
626 WRITE_ONCE(sk->sk_family, PF_INET);
627 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
628 } else {
629 struct proto *prot = &udp_prot;
630
631 if (sk->sk_protocol == IPPROTO_UDPLITE)
632 prot = &udplite_prot;
633
634 sock_prot_inuse_add(net, sk->sk_prot, -1);
635 sock_prot_inuse_add(net, prot, 1);
636
637 /* Paired with READ_ONCE(sk->sk_prot) in inet6_dgram_ops */
638 WRITE_ONCE(sk->sk_prot, prot);
639 WRITE_ONCE(sk->sk_socket->ops, &inet_dgram_ops);
640 WRITE_ONCE(sk->sk_family, PF_INET);
641 }
642
643 /* Disable all options not to allocate memory anymore,
644 * but there is still a race. See the lockless path
645 * in udpv6_sendmsg() and ipv6_local_rxpmtu().
646 */
647 np->rxopt.all = 0;
648
649 inet6_cleanup_sock(sk);
650
651 module_put(THIS_MODULE);
652 retv = 0;
653 break;
654 }
655 goto e_inval;
656
657 case IPV6_V6ONLY:
658 if (optlen < sizeof(int) ||
659 inet_sk(sk)->inet_num)
660 goto e_inval;
661 sk->sk_ipv6only = valbool;
662 retv = 0;
663 break;
664
665 case IPV6_RECVPKTINFO:
666 if (optlen < sizeof(int))
667 goto e_inval;
668 np->rxopt.bits.rxinfo = valbool;
669 retv = 0;
670 break;
671
672 case IPV6_2292PKTINFO:
673 if (optlen < sizeof(int))
674 goto e_inval;
675 np->rxopt.bits.rxoinfo = valbool;
676 retv = 0;
677 break;
678
679 case IPV6_RECVHOPLIMIT:
680 if (optlen < sizeof(int))
681 goto e_inval;
682 np->rxopt.bits.rxhlim = valbool;
683 retv = 0;
684 break;
685
686 case IPV6_2292HOPLIMIT:
687 if (optlen < sizeof(int))
688 goto e_inval;
689 np->rxopt.bits.rxohlim = valbool;
690 retv = 0;
691 break;
692
693 case IPV6_RECVRTHDR:
694 if (optlen < sizeof(int))
695 goto e_inval;
696 np->rxopt.bits.srcrt = valbool;
697 retv = 0;
698 break;
699
700 case IPV6_2292RTHDR:
701 if (optlen < sizeof(int))
702 goto e_inval;
703 np->rxopt.bits.osrcrt = valbool;
704 retv = 0;
705 break;
706
707 case IPV6_RECVHOPOPTS:
708 if (optlen < sizeof(int))
709 goto e_inval;
710 np->rxopt.bits.hopopts = valbool;
711 retv = 0;
712 break;
713
714 case IPV6_2292HOPOPTS:
715 if (optlen < sizeof(int))
716 goto e_inval;
717 np->rxopt.bits.ohopopts = valbool;
718 retv = 0;
719 break;
720
721 case IPV6_RECVDSTOPTS:
722 if (optlen < sizeof(int))
723 goto e_inval;
724 np->rxopt.bits.dstopts = valbool;
725 retv = 0;
726 break;
727
728 case IPV6_2292DSTOPTS:
729 if (optlen < sizeof(int))
730 goto e_inval;
731 np->rxopt.bits.odstopts = valbool;
732 retv = 0;
733 break;
734
735 case IPV6_TCLASS:
736 if (optlen < sizeof(int))
737 goto e_inval;
738 if (val < -1 || val > 0xff)
739 goto e_inval;
740 /* RFC 3542, 6.5: default traffic class of 0x0 */
741 if (val == -1)
742 val = 0;
743 if (sk->sk_type == SOCK_STREAM) {
744 val &= ~INET_ECN_MASK;
745 val |= np->tclass & INET_ECN_MASK;
746 }
747 if (np->tclass != val) {
748 np->tclass = val;
749 sk_dst_reset(sk);
750 }
751 retv = 0;
752 break;
753
754 case IPV6_RECVTCLASS:
755 if (optlen < sizeof(int))
756 goto e_inval;
757 np->rxopt.bits.rxtclass = valbool;
758 retv = 0;
759 break;
760
761 case IPV6_FLOWINFO:
762 if (optlen < sizeof(int))
763 goto e_inval;
764 np->rxopt.bits.rxflow = valbool;
765 retv = 0;
766 break;
767
768 case IPV6_RECVPATHMTU:
769 if (optlen < sizeof(int))
770 goto e_inval;
771 np->rxopt.bits.rxpmtu = valbool;
772 retv = 0;
773 break;
774
775 case IPV6_TRANSPARENT:
776 if (valbool && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW) &&
777 !sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) {
778 retv = -EPERM;
779 break;
780 }
781 if (optlen < sizeof(int))
782 goto e_inval;
783 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
784 inet_assign_bit(TRANSPARENT, sk, valbool);
785 retv = 0;
786 break;
787
788 case IPV6_FREEBIND:
789 if (optlen < sizeof(int))
790 goto e_inval;
791 /* we also don't have a separate freebind bit for IPV6 */
792 inet_assign_bit(FREEBIND, sk, valbool);
793 retv = 0;
794 break;
795
796 case IPV6_RECVORIGDSTADDR:
797 if (optlen < sizeof(int))
798 goto e_inval;
799 np->rxopt.bits.rxorigdstaddr = valbool;
800 retv = 0;
801 break;
802
803 case IPV6_HOPOPTS:
804 case IPV6_RTHDRDSTOPTS:
805 case IPV6_RTHDR:
806 case IPV6_DSTOPTS:
807 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen);
808 break;
809
810 case IPV6_PKTINFO:
811 {
812 struct in6_pktinfo pkt;
813
814 if (optlen == 0)
815 goto e_inval;
816 else if (optlen < sizeof(struct in6_pktinfo) ||
817 sockptr_is_null(optval))
818 goto e_inval;
819
820 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) {
821 retv = -EFAULT;
822 break;
823 }
824 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
825 goto e_inval;
826
827 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
828 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
829 retv = 0;
830 break;
831 }
832
833 case IPV6_2292PKTOPTIONS:
834 {
835 struct ipv6_txoptions *opt = NULL;
836 struct msghdr msg;
837 struct flowi6 fl6;
838 struct ipcm6_cookie ipc6;
839
840 memset(&fl6, 0, sizeof(fl6));
841 fl6.flowi6_oif = sk->sk_bound_dev_if;
842 fl6.flowi6_mark = sk->sk_mark;
843
844 if (optlen == 0)
845 goto update;
846
847 /* 1K is probably excessive
848 * 1K is surely not enough, 2K per standard header is 16K.
849 */
850 retv = -EINVAL;
851 if (optlen > 64*1024)
852 break;
853
854 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
855 retv = -ENOBUFS;
856 if (!opt)
857 break;
858
859 memset(opt, 0, sizeof(*opt));
860 refcount_set(&opt->refcnt, 1);
861 opt->tot_len = sizeof(*opt) + optlen;
862 retv = -EFAULT;
863 if (copy_from_sockptr(opt + 1, optval, optlen))
864 goto done;
865
866 msg.msg_controllen = optlen;
867 msg.msg_control_is_user = false;
868 msg.msg_control = (void *)(opt+1);
869 ipc6.opt = opt;
870
871 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
872 if (retv)
873 goto done;
874update:
875 retv = 0;
876 opt = ipv6_update_options(sk, opt);
877done:
878 if (opt) {
879 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
880 txopt_put(opt);
881 }
882 break;
883 }
884
885 case IPV6_ADD_MEMBERSHIP:
886 case IPV6_DROP_MEMBERSHIP:
887 {
888 struct ipv6_mreq mreq;
889
890 if (optlen < sizeof(struct ipv6_mreq))
891 goto e_inval;
892
893 retv = -EPROTO;
894 if (inet_test_bit(IS_ICSK, sk))
895 break;
896
897 retv = -EFAULT;
898 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
899 break;
900
901 if (optname == IPV6_ADD_MEMBERSHIP)
902 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
903 else
904 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
905 break;
906 }
907 case IPV6_JOIN_ANYCAST:
908 case IPV6_LEAVE_ANYCAST:
909 {
910 struct ipv6_mreq mreq;
911
912 if (optlen < sizeof(struct ipv6_mreq))
913 goto e_inval;
914
915 retv = -EFAULT;
916 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
917 break;
918
919 if (optname == IPV6_JOIN_ANYCAST)
920 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
921 else
922 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
923 break;
924 }
925 case MCAST_JOIN_GROUP:
926 case MCAST_LEAVE_GROUP:
927 if (in_compat_syscall())
928 retv = compat_ipv6_mcast_join_leave(sk, optname, optval,
929 optlen);
930 else
931 retv = ipv6_mcast_join_leave(sk, optname, optval,
932 optlen);
933 break;
934 case MCAST_JOIN_SOURCE_GROUP:
935 case MCAST_LEAVE_SOURCE_GROUP:
936 case MCAST_BLOCK_SOURCE:
937 case MCAST_UNBLOCK_SOURCE:
938 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen);
939 break;
940 case MCAST_MSFILTER:
941 if (in_compat_syscall())
942 retv = compat_ipv6_set_mcast_msfilter(sk, optval,
943 optlen);
944 else
945 retv = ipv6_set_mcast_msfilter(sk, optval, optlen);
946 break;
947 case IPV6_ROUTER_ALERT:
948 if (optlen < sizeof(int))
949 goto e_inval;
950 retv = ip6_ra_control(sk, val);
951 if (retv == 0)
952 inet6_assign_bit(RTALERT, sk, valbool);
953 break;
954 case IPV6_FLOWLABEL_MGR:
955 retv = ipv6_flowlabel_opt(sk, optval, optlen);
956 break;
957 case IPV6_IPSEC_POLICY:
958 case IPV6_XFRM_POLICY:
959 retv = -EPERM;
960 if (!sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN))
961 break;
962 retv = xfrm_user_policy(sk, optname, optval, optlen);
963 break;
964
965 case IPV6_RECVFRAGSIZE:
966 np->rxopt.bits.recvfragsize = valbool;
967 retv = 0;
968 break;
969 }
970
971unlock:
972 sockopt_release_sock(sk);
973 if (needs_rtnl)
974 rtnl_unlock();
975
976 return retv;
977
978e_inval:
979 retv = -EINVAL;
980 goto unlock;
981}
982
983int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
984 unsigned int optlen)
985{
986 int err;
987
988 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
989 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
990
991 if (level != SOL_IPV6)
992 return -ENOPROTOOPT;
993
994 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
995#ifdef CONFIG_NETFILTER
996 /* we need to exclude all possible ENOPROTOOPTs except default case */
997 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
998 optname != IPV6_XFRM_POLICY)
999 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
1000#endif
1001 return err;
1002}
1003EXPORT_SYMBOL(ipv6_setsockopt);
1004
1005static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
1006 int optname, sockptr_t optval, int len)
1007{
1008 struct ipv6_opt_hdr *hdr;
1009
1010 if (!opt)
1011 return 0;
1012
1013 switch (optname) {
1014 case IPV6_HOPOPTS:
1015 hdr = opt->hopopt;
1016 break;
1017 case IPV6_RTHDRDSTOPTS:
1018 hdr = opt->dst0opt;
1019 break;
1020 case IPV6_RTHDR:
1021 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1022 break;
1023 case IPV6_DSTOPTS:
1024 hdr = opt->dst1opt;
1025 break;
1026 default:
1027 return -EINVAL; /* should not happen */
1028 }
1029
1030 if (!hdr)
1031 return 0;
1032
1033 len = min_t(unsigned int, len, ipv6_optlen(hdr));
1034 if (copy_to_sockptr(optval, hdr, len))
1035 return -EFAULT;
1036 return len;
1037}
1038
1039static int ipv6_get_msfilter(struct sock *sk, sockptr_t optval,
1040 sockptr_t optlen, int len)
1041{
1042 const int size0 = offsetof(struct group_filter, gf_slist_flex);
1043 struct group_filter gsf;
1044 int num;
1045 int err;
1046
1047 if (len < size0)
1048 return -EINVAL;
1049 if (copy_from_sockptr(&gsf, optval, size0))
1050 return -EFAULT;
1051 if (gsf.gf_group.ss_family != AF_INET6)
1052 return -EADDRNOTAVAIL;
1053 num = gsf.gf_numsrc;
1054 sockopt_lock_sock(sk);
1055 err = ip6_mc_msfget(sk, &gsf, optval, size0);
1056 if (!err) {
1057 if (num > gsf.gf_numsrc)
1058 num = gsf.gf_numsrc;
1059 len = GROUP_FILTER_SIZE(num);
1060 if (copy_to_sockptr(optlen, &len, sizeof(int)) ||
1061 copy_to_sockptr(optval, &gsf, size0))
1062 err = -EFAULT;
1063 }
1064 sockopt_release_sock(sk);
1065 return err;
1066}
1067
1068static int compat_ipv6_get_msfilter(struct sock *sk, sockptr_t optval,
1069 sockptr_t optlen, int len)
1070{
1071 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
1072 struct compat_group_filter gf32;
1073 struct group_filter gf;
1074 int err;
1075 int num;
1076
1077 if (len < size0)
1078 return -EINVAL;
1079
1080 if (copy_from_sockptr(&gf32, optval, size0))
1081 return -EFAULT;
1082 gf.gf_interface = gf32.gf_interface;
1083 gf.gf_fmode = gf32.gf_fmode;
1084 num = gf.gf_numsrc = gf32.gf_numsrc;
1085 gf.gf_group = gf32.gf_group;
1086
1087 if (gf.gf_group.ss_family != AF_INET6)
1088 return -EADDRNOTAVAIL;
1089
1090 sockopt_lock_sock(sk);
1091 err = ip6_mc_msfget(sk, &gf, optval, size0);
1092 sockopt_release_sock(sk);
1093 if (err)
1094 return err;
1095 if (num > gf.gf_numsrc)
1096 num = gf.gf_numsrc;
1097 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32));
1098 if (copy_to_sockptr(optlen, &len, sizeof(int)) ||
1099 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_fmode),
1100 &gf.gf_fmode, sizeof(gf32.gf_fmode)) ||
1101 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_numsrc),
1102 &gf.gf_numsrc, sizeof(gf32.gf_numsrc)))
1103 return -EFAULT;
1104 return 0;
1105}
1106
1107int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1108 sockptr_t optval, sockptr_t optlen)
1109{
1110 struct ipv6_pinfo *np = inet6_sk(sk);
1111 int len;
1112 int val;
1113
1114 if (ip6_mroute_opt(optname))
1115 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1116
1117 if (copy_from_sockptr(&len, optlen, sizeof(int)))
1118 return -EFAULT;
1119 switch (optname) {
1120 case IPV6_ADDRFORM:
1121 if (sk->sk_protocol != IPPROTO_UDP &&
1122 sk->sk_protocol != IPPROTO_UDPLITE &&
1123 sk->sk_protocol != IPPROTO_TCP)
1124 return -ENOPROTOOPT;
1125 if (sk->sk_state != TCP_ESTABLISHED)
1126 return -ENOTCONN;
1127 val = sk->sk_family;
1128 break;
1129 case MCAST_MSFILTER:
1130 if (in_compat_syscall())
1131 return compat_ipv6_get_msfilter(sk, optval, optlen, len);
1132 return ipv6_get_msfilter(sk, optval, optlen, len);
1133 case IPV6_2292PKTOPTIONS:
1134 {
1135 struct msghdr msg;
1136 struct sk_buff *skb;
1137
1138 if (sk->sk_type != SOCK_STREAM)
1139 return -ENOPROTOOPT;
1140
1141 if (optval.is_kernel) {
1142 msg.msg_control_is_user = false;
1143 msg.msg_control = optval.kernel;
1144 } else {
1145 msg.msg_control_is_user = true;
1146 msg.msg_control_user = optval.user;
1147 }
1148 msg.msg_controllen = len;
1149 msg.msg_flags = 0;
1150
1151 sockopt_lock_sock(sk);
1152 skb = np->pktoptions;
1153 if (skb)
1154 ip6_datagram_recv_ctl(sk, &msg, skb);
1155 sockopt_release_sock(sk);
1156 if (!skb) {
1157 if (np->rxopt.bits.rxinfo) {
1158 int mcast_oif = READ_ONCE(np->mcast_oif);
1159 struct in6_pktinfo src_info;
1160
1161 src_info.ipi6_ifindex = mcast_oif ? :
1162 np->sticky_pktinfo.ipi6_ifindex;
1163 src_info.ipi6_addr = mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1164 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1165 }
1166 if (np->rxopt.bits.rxhlim) {
1167 int hlim = READ_ONCE(np->mcast_hops);
1168
1169 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1170 }
1171 if (np->rxopt.bits.rxtclass) {
1172 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1173
1174 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1175 }
1176 if (np->rxopt.bits.rxoinfo) {
1177 int mcast_oif = READ_ONCE(np->mcast_oif);
1178 struct in6_pktinfo src_info;
1179
1180 src_info.ipi6_ifindex = mcast_oif ? :
1181 np->sticky_pktinfo.ipi6_ifindex;
1182 src_info.ipi6_addr = mcast_oif ? sk->sk_v6_daddr :
1183 np->sticky_pktinfo.ipi6_addr;
1184 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1185 }
1186 if (np->rxopt.bits.rxohlim) {
1187 int hlim = READ_ONCE(np->mcast_hops);
1188
1189 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1190 }
1191 if (np->rxopt.bits.rxflow) {
1192 __be32 flowinfo = np->rcv_flowinfo;
1193
1194 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1195 }
1196 }
1197 len -= msg.msg_controllen;
1198 return copy_to_sockptr(optlen, &len, sizeof(int));
1199 }
1200 case IPV6_MTU:
1201 {
1202 struct dst_entry *dst;
1203
1204 val = 0;
1205 rcu_read_lock();
1206 dst = __sk_dst_get(sk);
1207 if (dst)
1208 val = dst_mtu(dst);
1209 rcu_read_unlock();
1210 if (!val)
1211 return -ENOTCONN;
1212 break;
1213 }
1214
1215 case IPV6_V6ONLY:
1216 val = sk->sk_ipv6only;
1217 break;
1218
1219 case IPV6_RECVPKTINFO:
1220 val = np->rxopt.bits.rxinfo;
1221 break;
1222
1223 case IPV6_2292PKTINFO:
1224 val = np->rxopt.bits.rxoinfo;
1225 break;
1226
1227 case IPV6_RECVHOPLIMIT:
1228 val = np->rxopt.bits.rxhlim;
1229 break;
1230
1231 case IPV6_2292HOPLIMIT:
1232 val = np->rxopt.bits.rxohlim;
1233 break;
1234
1235 case IPV6_RECVRTHDR:
1236 val = np->rxopt.bits.srcrt;
1237 break;
1238
1239 case IPV6_2292RTHDR:
1240 val = np->rxopt.bits.osrcrt;
1241 break;
1242
1243 case IPV6_HOPOPTS:
1244 case IPV6_RTHDRDSTOPTS:
1245 case IPV6_RTHDR:
1246 case IPV6_DSTOPTS:
1247 {
1248 struct ipv6_txoptions *opt;
1249
1250 sockopt_lock_sock(sk);
1251 opt = rcu_dereference_protected(np->opt,
1252 lockdep_sock_is_held(sk));
1253 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1254 sockopt_release_sock(sk);
1255 /* check if ipv6_getsockopt_sticky() returns err code */
1256 if (len < 0)
1257 return len;
1258 return copy_to_sockptr(optlen, &len, sizeof(int));
1259 }
1260
1261 case IPV6_RECVHOPOPTS:
1262 val = np->rxopt.bits.hopopts;
1263 break;
1264
1265 case IPV6_2292HOPOPTS:
1266 val = np->rxopt.bits.ohopopts;
1267 break;
1268
1269 case IPV6_RECVDSTOPTS:
1270 val = np->rxopt.bits.dstopts;
1271 break;
1272
1273 case IPV6_2292DSTOPTS:
1274 val = np->rxopt.bits.odstopts;
1275 break;
1276
1277 case IPV6_TCLASS:
1278 val = np->tclass;
1279 break;
1280
1281 case IPV6_RECVTCLASS:
1282 val = np->rxopt.bits.rxtclass;
1283 break;
1284
1285 case IPV6_FLOWINFO:
1286 val = np->rxopt.bits.rxflow;
1287 break;
1288
1289 case IPV6_RECVPATHMTU:
1290 val = np->rxopt.bits.rxpmtu;
1291 break;
1292
1293 case IPV6_PATHMTU:
1294 {
1295 struct dst_entry *dst;
1296 struct ip6_mtuinfo mtuinfo;
1297
1298 if (len < sizeof(mtuinfo))
1299 return -EINVAL;
1300
1301 len = sizeof(mtuinfo);
1302 memset(&mtuinfo, 0, sizeof(mtuinfo));
1303
1304 rcu_read_lock();
1305 dst = __sk_dst_get(sk);
1306 if (dst)
1307 mtuinfo.ip6m_mtu = dst_mtu(dst);
1308 rcu_read_unlock();
1309 if (!mtuinfo.ip6m_mtu)
1310 return -ENOTCONN;
1311
1312 if (copy_to_sockptr(optlen, &len, sizeof(int)))
1313 return -EFAULT;
1314 if (copy_to_sockptr(optval, &mtuinfo, len))
1315 return -EFAULT;
1316
1317 return 0;
1318 }
1319
1320 case IPV6_TRANSPARENT:
1321 val = inet_test_bit(TRANSPARENT, sk);
1322 break;
1323
1324 case IPV6_FREEBIND:
1325 val = inet_test_bit(FREEBIND, sk);
1326 break;
1327
1328 case IPV6_RECVORIGDSTADDR:
1329 val = np->rxopt.bits.rxorigdstaddr;
1330 break;
1331
1332 case IPV6_UNICAST_HOPS:
1333 case IPV6_MULTICAST_HOPS:
1334 {
1335 struct dst_entry *dst;
1336
1337 if (optname == IPV6_UNICAST_HOPS)
1338 val = READ_ONCE(np->hop_limit);
1339 else
1340 val = READ_ONCE(np->mcast_hops);
1341
1342 if (val < 0) {
1343 rcu_read_lock();
1344 dst = __sk_dst_get(sk);
1345 if (dst)
1346 val = ip6_dst_hoplimit(dst);
1347 rcu_read_unlock();
1348 }
1349
1350 if (val < 0)
1351 val = READ_ONCE(sock_net(sk)->ipv6.devconf_all->hop_limit);
1352 break;
1353 }
1354
1355 case IPV6_MULTICAST_LOOP:
1356 val = inet6_test_bit(MC6_LOOP, sk);
1357 break;
1358
1359 case IPV6_MULTICAST_IF:
1360 val = READ_ONCE(np->mcast_oif);
1361 break;
1362
1363 case IPV6_MULTICAST_ALL:
1364 val = inet6_test_bit(MC6_ALL, sk);
1365 break;
1366
1367 case IPV6_UNICAST_IF:
1368 val = (__force int)htonl((__u32) READ_ONCE(np->ucast_oif));
1369 break;
1370
1371 case IPV6_MTU_DISCOVER:
1372 val = READ_ONCE(np->pmtudisc);
1373 break;
1374
1375 case IPV6_RECVERR:
1376 val = inet6_test_bit(RECVERR6, sk);
1377 break;
1378
1379 case IPV6_FLOWINFO_SEND:
1380 val = inet6_test_bit(SNDFLOW, sk);
1381 break;
1382
1383 case IPV6_FLOWLABEL_MGR:
1384 {
1385 struct in6_flowlabel_req freq;
1386 int flags;
1387
1388 if (len < sizeof(freq))
1389 return -EINVAL;
1390
1391 if (copy_from_sockptr(&freq, optval, sizeof(freq)))
1392 return -EFAULT;
1393
1394 if (freq.flr_action != IPV6_FL_A_GET)
1395 return -EINVAL;
1396
1397 len = sizeof(freq);
1398 flags = freq.flr_flags;
1399
1400 memset(&freq, 0, sizeof(freq));
1401
1402 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1403 if (val < 0)
1404 return val;
1405
1406 if (copy_to_sockptr(optlen, &len, sizeof(int)))
1407 return -EFAULT;
1408 if (copy_to_sockptr(optval, &freq, len))
1409 return -EFAULT;
1410
1411 return 0;
1412 }
1413
1414 case IPV6_ADDR_PREFERENCES:
1415 {
1416 u8 srcprefs = READ_ONCE(np->srcprefs);
1417 val = 0;
1418
1419 if (srcprefs & IPV6_PREFER_SRC_TMP)
1420 val |= IPV6_PREFER_SRC_TMP;
1421 else if (srcprefs & IPV6_PREFER_SRC_PUBLIC)
1422 val |= IPV6_PREFER_SRC_PUBLIC;
1423 else {
1424 /* XXX: should we return system default? */
1425 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1426 }
1427
1428 if (srcprefs & IPV6_PREFER_SRC_COA)
1429 val |= IPV6_PREFER_SRC_COA;
1430 else
1431 val |= IPV6_PREFER_SRC_HOME;
1432 break;
1433 }
1434 case IPV6_MINHOPCOUNT:
1435 val = READ_ONCE(np->min_hopcount);
1436 break;
1437
1438 case IPV6_DONTFRAG:
1439 val = inet6_test_bit(DONTFRAG, sk);
1440 break;
1441
1442 case IPV6_AUTOFLOWLABEL:
1443 val = ip6_autoflowlabel(sock_net(sk), sk);
1444 break;
1445
1446 case IPV6_RECVFRAGSIZE:
1447 val = np->rxopt.bits.recvfragsize;
1448 break;
1449
1450 case IPV6_ROUTER_ALERT:
1451 val = inet6_test_bit(RTALERT, sk);
1452 break;
1453
1454 case IPV6_ROUTER_ALERT_ISOLATE:
1455 val = inet6_test_bit(RTALERT_ISOLATE, sk);
1456 break;
1457
1458 case IPV6_RECVERR_RFC4884:
1459 val = inet6_test_bit(RECVERR6_RFC4884, sk);
1460 break;
1461
1462 default:
1463 return -ENOPROTOOPT;
1464 }
1465 len = min_t(unsigned int, sizeof(int), len);
1466 if (copy_to_sockptr(optlen, &len, sizeof(int)))
1467 return -EFAULT;
1468 if (copy_to_sockptr(optval, &val, len))
1469 return -EFAULT;
1470 return 0;
1471}
1472
1473int ipv6_getsockopt(struct sock *sk, int level, int optname,
1474 char __user *optval, int __user *optlen)
1475{
1476 int err;
1477
1478 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1479 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1480
1481 if (level != SOL_IPV6)
1482 return -ENOPROTOOPT;
1483
1484 err = do_ipv6_getsockopt(sk, level, optname,
1485 USER_SOCKPTR(optval), USER_SOCKPTR(optlen));
1486#ifdef CONFIG_NETFILTER
1487 /* we need to exclude all possible ENOPROTOOPTs except default case */
1488 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1489 int len;
1490
1491 if (get_user(len, optlen))
1492 return -EFAULT;
1493
1494 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1495 if (err >= 0)
1496 err = put_user(len, optlen);
1497 }
1498#endif
1499 return err;
1500}
1501EXPORT_SYMBOL(ipv6_getsockopt);
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
55struct ip6_ra_chain *ip6_ra_chain;
56DEFINE_RWLOCK(ip6_ra_lock);
57
58DEFINE_STATIC_KEY_FALSE(ip6_min_hopcount);
59
60int 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
102struct 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
120static 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
140static 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
163static 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
204static 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(sock_net(sk)->core.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);
230out_free_gsf:
231 kfree(gsf);
232 return ret;
233}
234
235static 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(sock_net(sk)->core.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
274out_free_p:
275 kfree(p);
276 return ret;
277}
278
279static 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
299static 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
319static 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);
385sticky_done:
386 if (opt) {
387 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
388 txopt_put(opt);
389 }
390 return err;
391}
392
393int 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 /* Handle options that can be set without locking the socket. */
418 switch (optname) {
419 case IPV6_UNICAST_HOPS:
420 if (optlen < sizeof(int))
421 return -EINVAL;
422 if (val > 255 || val < -1)
423 return -EINVAL;
424 WRITE_ONCE(np->hop_limit, val);
425 return 0;
426 case IPV6_MULTICAST_LOOP:
427 if (optlen < sizeof(int))
428 return -EINVAL;
429 if (val != valbool)
430 return -EINVAL;
431 inet6_assign_bit(MC6_LOOP, sk, valbool);
432 return 0;
433 case IPV6_MULTICAST_HOPS:
434 if (sk->sk_type == SOCK_STREAM)
435 return retv;
436 if (optlen < sizeof(int))
437 return -EINVAL;
438 if (val > 255 || val < -1)
439 return -EINVAL;
440 WRITE_ONCE(np->mcast_hops,
441 val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
442 return 0;
443 case IPV6_MTU:
444 if (optlen < sizeof(int))
445 return -EINVAL;
446 if (val && val < IPV6_MIN_MTU)
447 return -EINVAL;
448 WRITE_ONCE(np->frag_size, val);
449 return 0;
450 case IPV6_MINHOPCOUNT:
451 if (optlen < sizeof(int))
452 return -EINVAL;
453 if (val < 0 || val > 255)
454 return -EINVAL;
455
456 if (val)
457 static_branch_enable(&ip6_min_hopcount);
458
459 /* tcp_v6_err() and tcp_v6_rcv() might read min_hopcount
460 * while we are changing it.
461 */
462 WRITE_ONCE(np->min_hopcount, val);
463 return 0;
464 case IPV6_RECVERR_RFC4884:
465 if (optlen < sizeof(int))
466 return -EINVAL;
467 if (val < 0 || val > 1)
468 return -EINVAL;
469 inet6_assign_bit(RECVERR6_RFC4884, sk, valbool);
470 return 0;
471 case IPV6_MULTICAST_ALL:
472 if (optlen < sizeof(int))
473 return -EINVAL;
474 inet6_assign_bit(MC6_ALL, sk, valbool);
475 return 0;
476 case IPV6_AUTOFLOWLABEL:
477 inet6_assign_bit(AUTOFLOWLABEL, sk, valbool);
478 inet6_set_bit(AUTOFLOWLABEL_SET, sk);
479 return 0;
480 case IPV6_DONTFRAG:
481 inet6_assign_bit(DONTFRAG, sk, valbool);
482 return 0;
483 case IPV6_RECVERR:
484 if (optlen < sizeof(int))
485 return -EINVAL;
486 inet6_assign_bit(RECVERR6, sk, valbool);
487 if (!val)
488 skb_errqueue_purge(&sk->sk_error_queue);
489 return 0;
490 case IPV6_ROUTER_ALERT_ISOLATE:
491 if (optlen < sizeof(int))
492 return -EINVAL;
493 inet6_assign_bit(RTALERT_ISOLATE, sk, valbool);
494 return 0;
495 case IPV6_MTU_DISCOVER:
496 if (optlen < sizeof(int))
497 return -EINVAL;
498 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
499 return -EINVAL;
500 WRITE_ONCE(np->pmtudisc, val);
501 return 0;
502 case IPV6_FLOWINFO_SEND:
503 if (optlen < sizeof(int))
504 return -EINVAL;
505 inet6_assign_bit(SNDFLOW, sk, valbool);
506 return 0;
507 case IPV6_ADDR_PREFERENCES:
508 if (optlen < sizeof(int))
509 return -EINVAL;
510 return ip6_sock_set_addr_preferences(sk, val);
511 case IPV6_MULTICAST_IF:
512 if (sk->sk_type == SOCK_STREAM)
513 return -ENOPROTOOPT;
514 if (optlen < sizeof(int))
515 return -EINVAL;
516 if (val) {
517 struct net_device *dev;
518 int bound_dev_if, midx;
519
520 rcu_read_lock();
521
522 dev = dev_get_by_index_rcu(net, val);
523 if (!dev) {
524 rcu_read_unlock();
525 return -ENODEV;
526 }
527 midx = l3mdev_master_ifindex_rcu(dev);
528
529 rcu_read_unlock();
530
531 bound_dev_if = READ_ONCE(sk->sk_bound_dev_if);
532 if (bound_dev_if &&
533 bound_dev_if != val &&
534 (!midx || midx != bound_dev_if))
535 return -EINVAL;
536 }
537 WRITE_ONCE(np->mcast_oif, val);
538 return 0;
539 case IPV6_UNICAST_IF:
540 {
541 struct net_device *dev;
542 int ifindex;
543
544 if (optlen != sizeof(int))
545 return -EINVAL;
546
547 ifindex = (__force int)ntohl((__force __be32)val);
548 if (!ifindex) {
549 WRITE_ONCE(np->ucast_oif, 0);
550 return 0;
551 }
552
553 dev = dev_get_by_index(net, ifindex);
554 if (!dev)
555 return -EADDRNOTAVAIL;
556 dev_put(dev);
557
558 if (READ_ONCE(sk->sk_bound_dev_if))
559 return -EINVAL;
560
561 WRITE_ONCE(np->ucast_oif, ifindex);
562 return 0;
563 }
564 }
565 if (needs_rtnl)
566 rtnl_lock();
567 sockopt_lock_sock(sk);
568
569 /* Another thread has converted the socket into IPv4 with
570 * IPV6_ADDRFORM concurrently.
571 */
572 if (unlikely(sk->sk_family != AF_INET6))
573 goto unlock;
574
575 switch (optname) {
576
577 case IPV6_ADDRFORM:
578 if (optlen < sizeof(int))
579 goto e_inval;
580 if (val == PF_INET) {
581 if (sk->sk_type == SOCK_RAW)
582 break;
583
584 if (sk->sk_protocol == IPPROTO_UDP ||
585 sk->sk_protocol == IPPROTO_UDPLITE) {
586 struct udp_sock *up = udp_sk(sk);
587 if (up->pending == AF_INET6) {
588 retv = -EBUSY;
589 break;
590 }
591 } else if (sk->sk_protocol == IPPROTO_TCP) {
592 if (sk->sk_prot != &tcpv6_prot) {
593 retv = -EBUSY;
594 break;
595 }
596 } else {
597 break;
598 }
599
600 if (sk->sk_state != TCP_ESTABLISHED) {
601 retv = -ENOTCONN;
602 break;
603 }
604
605 if (ipv6_only_sock(sk) ||
606 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
607 retv = -EADDRNOTAVAIL;
608 break;
609 }
610
611 __ipv6_sock_mc_close(sk);
612 __ipv6_sock_ac_close(sk);
613
614 if (sk->sk_protocol == IPPROTO_TCP) {
615 struct inet_connection_sock *icsk = inet_csk(sk);
616
617 sock_prot_inuse_add(net, sk->sk_prot, -1);
618 sock_prot_inuse_add(net, &tcp_prot, 1);
619
620 /* Paired with READ_ONCE(sk->sk_prot) in inet6_stream_ops */
621 WRITE_ONCE(sk->sk_prot, &tcp_prot);
622 /* Paired with READ_ONCE() in tcp_(get|set)sockopt() */
623 WRITE_ONCE(icsk->icsk_af_ops, &ipv4_specific);
624 WRITE_ONCE(sk->sk_socket->ops, &inet_stream_ops);
625 WRITE_ONCE(sk->sk_family, PF_INET);
626 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
627 } else {
628 struct proto *prot = &udp_prot;
629
630 if (sk->sk_protocol == IPPROTO_UDPLITE)
631 prot = &udplite_prot;
632
633 sock_prot_inuse_add(net, sk->sk_prot, -1);
634 sock_prot_inuse_add(net, prot, 1);
635
636 /* Paired with READ_ONCE(sk->sk_prot) in inet6_dgram_ops */
637 WRITE_ONCE(sk->sk_prot, prot);
638 WRITE_ONCE(sk->sk_socket->ops, &inet_dgram_ops);
639 WRITE_ONCE(sk->sk_family, PF_INET);
640 }
641
642 /* Disable all options not to allocate memory anymore,
643 * but there is still a race. See the lockless path
644 * in udpv6_sendmsg() and ipv6_local_rxpmtu().
645 */
646 np->rxopt.all = 0;
647
648 inet6_cleanup_sock(sk);
649
650 module_put(THIS_MODULE);
651 retv = 0;
652 break;
653 }
654 goto e_inval;
655
656 case IPV6_V6ONLY:
657 if (optlen < sizeof(int) ||
658 inet_sk(sk)->inet_num)
659 goto e_inval;
660 sk->sk_ipv6only = valbool;
661 retv = 0;
662 break;
663
664 case IPV6_RECVPKTINFO:
665 if (optlen < sizeof(int))
666 goto e_inval;
667 np->rxopt.bits.rxinfo = valbool;
668 retv = 0;
669 break;
670
671 case IPV6_2292PKTINFO:
672 if (optlen < sizeof(int))
673 goto e_inval;
674 np->rxopt.bits.rxoinfo = valbool;
675 retv = 0;
676 break;
677
678 case IPV6_RECVHOPLIMIT:
679 if (optlen < sizeof(int))
680 goto e_inval;
681 np->rxopt.bits.rxhlim = valbool;
682 retv = 0;
683 break;
684
685 case IPV6_2292HOPLIMIT:
686 if (optlen < sizeof(int))
687 goto e_inval;
688 np->rxopt.bits.rxohlim = valbool;
689 retv = 0;
690 break;
691
692 case IPV6_RECVRTHDR:
693 if (optlen < sizeof(int))
694 goto e_inval;
695 np->rxopt.bits.srcrt = valbool;
696 retv = 0;
697 break;
698
699 case IPV6_2292RTHDR:
700 if (optlen < sizeof(int))
701 goto e_inval;
702 np->rxopt.bits.osrcrt = valbool;
703 retv = 0;
704 break;
705
706 case IPV6_RECVHOPOPTS:
707 if (optlen < sizeof(int))
708 goto e_inval;
709 np->rxopt.bits.hopopts = valbool;
710 retv = 0;
711 break;
712
713 case IPV6_2292HOPOPTS:
714 if (optlen < sizeof(int))
715 goto e_inval;
716 np->rxopt.bits.ohopopts = valbool;
717 retv = 0;
718 break;
719
720 case IPV6_RECVDSTOPTS:
721 if (optlen < sizeof(int))
722 goto e_inval;
723 np->rxopt.bits.dstopts = valbool;
724 retv = 0;
725 break;
726
727 case IPV6_2292DSTOPTS:
728 if (optlen < sizeof(int))
729 goto e_inval;
730 np->rxopt.bits.odstopts = valbool;
731 retv = 0;
732 break;
733
734 case IPV6_TCLASS:
735 if (optlen < sizeof(int))
736 goto e_inval;
737 if (val < -1 || val > 0xff)
738 goto e_inval;
739 /* RFC 3542, 6.5: default traffic class of 0x0 */
740 if (val == -1)
741 val = 0;
742 if (sk->sk_type == SOCK_STREAM) {
743 val &= ~INET_ECN_MASK;
744 val |= np->tclass & INET_ECN_MASK;
745 }
746 if (np->tclass != val) {
747 np->tclass = val;
748 sk_dst_reset(sk);
749 }
750 retv = 0;
751 break;
752
753 case IPV6_RECVTCLASS:
754 if (optlen < sizeof(int))
755 goto e_inval;
756 np->rxopt.bits.rxtclass = valbool;
757 retv = 0;
758 break;
759
760 case IPV6_FLOWINFO:
761 if (optlen < sizeof(int))
762 goto e_inval;
763 np->rxopt.bits.rxflow = valbool;
764 retv = 0;
765 break;
766
767 case IPV6_RECVPATHMTU:
768 if (optlen < sizeof(int))
769 goto e_inval;
770 np->rxopt.bits.rxpmtu = valbool;
771 retv = 0;
772 break;
773
774 case IPV6_TRANSPARENT:
775 if (valbool && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW) &&
776 !sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) {
777 retv = -EPERM;
778 break;
779 }
780 if (optlen < sizeof(int))
781 goto e_inval;
782 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
783 inet_assign_bit(TRANSPARENT, sk, valbool);
784 retv = 0;
785 break;
786
787 case IPV6_FREEBIND:
788 if (optlen < sizeof(int))
789 goto e_inval;
790 /* we also don't have a separate freebind bit for IPV6 */
791 inet_assign_bit(FREEBIND, sk, valbool);
792 retv = 0;
793 break;
794
795 case IPV6_RECVORIGDSTADDR:
796 if (optlen < sizeof(int))
797 goto e_inval;
798 np->rxopt.bits.rxorigdstaddr = valbool;
799 retv = 0;
800 break;
801
802 case IPV6_HOPOPTS:
803 case IPV6_RTHDRDSTOPTS:
804 case IPV6_RTHDR:
805 case IPV6_DSTOPTS:
806 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen);
807 break;
808
809 case IPV6_PKTINFO:
810 {
811 struct in6_pktinfo pkt;
812
813 if (optlen == 0)
814 goto e_inval;
815 else if (optlen < sizeof(struct in6_pktinfo) ||
816 sockptr_is_null(optval))
817 goto e_inval;
818
819 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) {
820 retv = -EFAULT;
821 break;
822 }
823 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
824 goto e_inval;
825
826 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
827 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
828 retv = 0;
829 break;
830 }
831
832 case IPV6_2292PKTOPTIONS:
833 {
834 struct ipv6_txoptions *opt = NULL;
835 struct msghdr msg;
836 struct flowi6 fl6;
837 struct ipcm6_cookie ipc6;
838
839 memset(&fl6, 0, sizeof(fl6));
840 fl6.flowi6_oif = sk->sk_bound_dev_if;
841 fl6.flowi6_mark = sk->sk_mark;
842
843 if (optlen == 0)
844 goto update;
845
846 /* 1K is probably excessive
847 * 1K is surely not enough, 2K per standard header is 16K.
848 */
849 retv = -EINVAL;
850 if (optlen > 64*1024)
851 break;
852
853 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
854 retv = -ENOBUFS;
855 if (!opt)
856 break;
857
858 memset(opt, 0, sizeof(*opt));
859 refcount_set(&opt->refcnt, 1);
860 opt->tot_len = sizeof(*opt) + optlen;
861 retv = -EFAULT;
862 if (copy_from_sockptr(opt + 1, optval, optlen))
863 goto done;
864
865 msg.msg_controllen = optlen;
866 msg.msg_control_is_user = false;
867 msg.msg_control = (void *)(opt+1);
868 ipc6.opt = opt;
869
870 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
871 if (retv)
872 goto done;
873update:
874 retv = 0;
875 opt = ipv6_update_options(sk, opt);
876done:
877 if (opt) {
878 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
879 txopt_put(opt);
880 }
881 break;
882 }
883
884 case IPV6_ADD_MEMBERSHIP:
885 case IPV6_DROP_MEMBERSHIP:
886 {
887 struct ipv6_mreq mreq;
888
889 if (optlen < sizeof(struct ipv6_mreq))
890 goto e_inval;
891
892 retv = -EPROTO;
893 if (inet_test_bit(IS_ICSK, sk))
894 break;
895
896 retv = -EFAULT;
897 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
898 break;
899
900 if (optname == IPV6_ADD_MEMBERSHIP)
901 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
902 else
903 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
904 break;
905 }
906 case IPV6_JOIN_ANYCAST:
907 case IPV6_LEAVE_ANYCAST:
908 {
909 struct ipv6_mreq mreq;
910
911 if (optlen < sizeof(struct ipv6_mreq))
912 goto e_inval;
913
914 retv = -EFAULT;
915 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
916 break;
917
918 if (optname == IPV6_JOIN_ANYCAST)
919 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
920 else
921 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
922 break;
923 }
924 case MCAST_JOIN_GROUP:
925 case MCAST_LEAVE_GROUP:
926 if (in_compat_syscall())
927 retv = compat_ipv6_mcast_join_leave(sk, optname, optval,
928 optlen);
929 else
930 retv = ipv6_mcast_join_leave(sk, optname, optval,
931 optlen);
932 break;
933 case MCAST_JOIN_SOURCE_GROUP:
934 case MCAST_LEAVE_SOURCE_GROUP:
935 case MCAST_BLOCK_SOURCE:
936 case MCAST_UNBLOCK_SOURCE:
937 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen);
938 break;
939 case MCAST_MSFILTER:
940 if (in_compat_syscall())
941 retv = compat_ipv6_set_mcast_msfilter(sk, optval,
942 optlen);
943 else
944 retv = ipv6_set_mcast_msfilter(sk, optval, optlen);
945 break;
946 case IPV6_ROUTER_ALERT:
947 if (optlen < sizeof(int))
948 goto e_inval;
949 retv = ip6_ra_control(sk, val);
950 if (retv == 0)
951 inet6_assign_bit(RTALERT, sk, valbool);
952 break;
953 case IPV6_FLOWLABEL_MGR:
954 retv = ipv6_flowlabel_opt(sk, optval, optlen);
955 break;
956 case IPV6_IPSEC_POLICY:
957 case IPV6_XFRM_POLICY:
958 retv = -EPERM;
959 if (!sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN))
960 break;
961 retv = xfrm_user_policy(sk, optname, optval, optlen);
962 break;
963
964 case IPV6_RECVFRAGSIZE:
965 np->rxopt.bits.recvfragsize = valbool;
966 retv = 0;
967 break;
968 }
969
970unlock:
971 sockopt_release_sock(sk);
972 if (needs_rtnl)
973 rtnl_unlock();
974
975 return retv;
976
977e_inval:
978 retv = -EINVAL;
979 goto unlock;
980}
981
982int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
983 unsigned int optlen)
984{
985 int err;
986
987 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
988 return ip_setsockopt(sk, level, optname, optval, optlen);
989
990 if (level != SOL_IPV6)
991 return -ENOPROTOOPT;
992
993 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
994#ifdef CONFIG_NETFILTER
995 /* we need to exclude all possible ENOPROTOOPTs except default case */
996 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
997 optname != IPV6_XFRM_POLICY)
998 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
999#endif
1000 return err;
1001}
1002EXPORT_SYMBOL(ipv6_setsockopt);
1003
1004static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
1005 int optname, sockptr_t optval, int len)
1006{
1007 struct ipv6_opt_hdr *hdr;
1008
1009 if (!opt)
1010 return 0;
1011
1012 switch (optname) {
1013 case IPV6_HOPOPTS:
1014 hdr = opt->hopopt;
1015 break;
1016 case IPV6_RTHDRDSTOPTS:
1017 hdr = opt->dst0opt;
1018 break;
1019 case IPV6_RTHDR:
1020 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1021 break;
1022 case IPV6_DSTOPTS:
1023 hdr = opt->dst1opt;
1024 break;
1025 default:
1026 return -EINVAL; /* should not happen */
1027 }
1028
1029 if (!hdr)
1030 return 0;
1031
1032 len = min_t(unsigned int, len, ipv6_optlen(hdr));
1033 if (copy_to_sockptr(optval, hdr, len))
1034 return -EFAULT;
1035 return len;
1036}
1037
1038static int ipv6_get_msfilter(struct sock *sk, sockptr_t optval,
1039 sockptr_t optlen, int len)
1040{
1041 const int size0 = offsetof(struct group_filter, gf_slist_flex);
1042 struct group_filter gsf;
1043 int num;
1044 int err;
1045
1046 if (len < size0)
1047 return -EINVAL;
1048 if (copy_from_sockptr(&gsf, optval, size0))
1049 return -EFAULT;
1050 if (gsf.gf_group.ss_family != AF_INET6)
1051 return -EADDRNOTAVAIL;
1052 num = gsf.gf_numsrc;
1053 sockopt_lock_sock(sk);
1054 err = ip6_mc_msfget(sk, &gsf, optval, size0);
1055 if (!err) {
1056 if (num > gsf.gf_numsrc)
1057 num = gsf.gf_numsrc;
1058 len = GROUP_FILTER_SIZE(num);
1059 if (copy_to_sockptr(optlen, &len, sizeof(int)) ||
1060 copy_to_sockptr(optval, &gsf, size0))
1061 err = -EFAULT;
1062 }
1063 sockopt_release_sock(sk);
1064 return err;
1065}
1066
1067static int compat_ipv6_get_msfilter(struct sock *sk, sockptr_t optval,
1068 sockptr_t optlen, int len)
1069{
1070 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
1071 struct compat_group_filter gf32;
1072 struct group_filter gf;
1073 int err;
1074 int num;
1075
1076 if (len < size0)
1077 return -EINVAL;
1078
1079 if (copy_from_sockptr(&gf32, optval, size0))
1080 return -EFAULT;
1081 gf.gf_interface = gf32.gf_interface;
1082 gf.gf_fmode = gf32.gf_fmode;
1083 num = gf.gf_numsrc = gf32.gf_numsrc;
1084 gf.gf_group = gf32.gf_group;
1085
1086 if (gf.gf_group.ss_family != AF_INET6)
1087 return -EADDRNOTAVAIL;
1088
1089 sockopt_lock_sock(sk);
1090 err = ip6_mc_msfget(sk, &gf, optval, size0);
1091 sockopt_release_sock(sk);
1092 if (err)
1093 return err;
1094 if (num > gf.gf_numsrc)
1095 num = gf.gf_numsrc;
1096 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32));
1097 if (copy_to_sockptr(optlen, &len, sizeof(int)) ||
1098 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_fmode),
1099 &gf.gf_fmode, sizeof(gf32.gf_fmode)) ||
1100 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_numsrc),
1101 &gf.gf_numsrc, sizeof(gf32.gf_numsrc)))
1102 return -EFAULT;
1103 return 0;
1104}
1105
1106int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1107 sockptr_t optval, sockptr_t optlen)
1108{
1109 struct ipv6_pinfo *np = inet6_sk(sk);
1110 int len;
1111 int val;
1112
1113 if (ip6_mroute_opt(optname))
1114 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1115
1116 if (copy_from_sockptr(&len, optlen, sizeof(int)))
1117 return -EFAULT;
1118 switch (optname) {
1119 case IPV6_ADDRFORM:
1120 if (sk->sk_protocol != IPPROTO_UDP &&
1121 sk->sk_protocol != IPPROTO_UDPLITE &&
1122 sk->sk_protocol != IPPROTO_TCP)
1123 return -ENOPROTOOPT;
1124 if (sk->sk_state != TCP_ESTABLISHED)
1125 return -ENOTCONN;
1126 val = sk->sk_family;
1127 break;
1128 case MCAST_MSFILTER:
1129 if (in_compat_syscall())
1130 return compat_ipv6_get_msfilter(sk, optval, optlen, len);
1131 return ipv6_get_msfilter(sk, optval, optlen, len);
1132 case IPV6_2292PKTOPTIONS:
1133 {
1134 struct msghdr msg;
1135 struct sk_buff *skb;
1136
1137 if (sk->sk_type != SOCK_STREAM)
1138 return -ENOPROTOOPT;
1139
1140 if (optval.is_kernel) {
1141 msg.msg_control_is_user = false;
1142 msg.msg_control = optval.kernel;
1143 } else {
1144 msg.msg_control_is_user = true;
1145 msg.msg_control_user = optval.user;
1146 }
1147 msg.msg_controllen = len;
1148 msg.msg_flags = 0;
1149
1150 sockopt_lock_sock(sk);
1151 skb = np->pktoptions;
1152 if (skb)
1153 ip6_datagram_recv_ctl(sk, &msg, skb);
1154 sockopt_release_sock(sk);
1155 if (!skb) {
1156 if (np->rxopt.bits.rxinfo) {
1157 int mcast_oif = READ_ONCE(np->mcast_oif);
1158 struct in6_pktinfo src_info;
1159
1160 src_info.ipi6_ifindex = mcast_oif ? :
1161 np->sticky_pktinfo.ipi6_ifindex;
1162 src_info.ipi6_addr = mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1163 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1164 }
1165 if (np->rxopt.bits.rxhlim) {
1166 int hlim = READ_ONCE(np->mcast_hops);
1167
1168 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1169 }
1170 if (np->rxopt.bits.rxtclass) {
1171 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1172
1173 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1174 }
1175 if (np->rxopt.bits.rxoinfo) {
1176 int mcast_oif = READ_ONCE(np->mcast_oif);
1177 struct in6_pktinfo src_info;
1178
1179 src_info.ipi6_ifindex = mcast_oif ? :
1180 np->sticky_pktinfo.ipi6_ifindex;
1181 src_info.ipi6_addr = mcast_oif ? sk->sk_v6_daddr :
1182 np->sticky_pktinfo.ipi6_addr;
1183 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1184 }
1185 if (np->rxopt.bits.rxohlim) {
1186 int hlim = READ_ONCE(np->mcast_hops);
1187
1188 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1189 }
1190 if (np->rxopt.bits.rxflow) {
1191 __be32 flowinfo = np->rcv_flowinfo;
1192
1193 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1194 }
1195 }
1196 len -= msg.msg_controllen;
1197 return copy_to_sockptr(optlen, &len, sizeof(int));
1198 }
1199 case IPV6_MTU:
1200 {
1201 struct dst_entry *dst;
1202
1203 val = 0;
1204 rcu_read_lock();
1205 dst = __sk_dst_get(sk);
1206 if (dst)
1207 val = dst_mtu(dst);
1208 rcu_read_unlock();
1209 if (!val)
1210 return -ENOTCONN;
1211 break;
1212 }
1213
1214 case IPV6_V6ONLY:
1215 val = sk->sk_ipv6only;
1216 break;
1217
1218 case IPV6_RECVPKTINFO:
1219 val = np->rxopt.bits.rxinfo;
1220 break;
1221
1222 case IPV6_2292PKTINFO:
1223 val = np->rxopt.bits.rxoinfo;
1224 break;
1225
1226 case IPV6_RECVHOPLIMIT:
1227 val = np->rxopt.bits.rxhlim;
1228 break;
1229
1230 case IPV6_2292HOPLIMIT:
1231 val = np->rxopt.bits.rxohlim;
1232 break;
1233
1234 case IPV6_RECVRTHDR:
1235 val = np->rxopt.bits.srcrt;
1236 break;
1237
1238 case IPV6_2292RTHDR:
1239 val = np->rxopt.bits.osrcrt;
1240 break;
1241
1242 case IPV6_HOPOPTS:
1243 case IPV6_RTHDRDSTOPTS:
1244 case IPV6_RTHDR:
1245 case IPV6_DSTOPTS:
1246 {
1247 struct ipv6_txoptions *opt;
1248
1249 sockopt_lock_sock(sk);
1250 opt = rcu_dereference_protected(np->opt,
1251 lockdep_sock_is_held(sk));
1252 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1253 sockopt_release_sock(sk);
1254 /* check if ipv6_getsockopt_sticky() returns err code */
1255 if (len < 0)
1256 return len;
1257 return copy_to_sockptr(optlen, &len, sizeof(int));
1258 }
1259
1260 case IPV6_RECVHOPOPTS:
1261 val = np->rxopt.bits.hopopts;
1262 break;
1263
1264 case IPV6_2292HOPOPTS:
1265 val = np->rxopt.bits.ohopopts;
1266 break;
1267
1268 case IPV6_RECVDSTOPTS:
1269 val = np->rxopt.bits.dstopts;
1270 break;
1271
1272 case IPV6_2292DSTOPTS:
1273 val = np->rxopt.bits.odstopts;
1274 break;
1275
1276 case IPV6_TCLASS:
1277 val = np->tclass;
1278 break;
1279
1280 case IPV6_RECVTCLASS:
1281 val = np->rxopt.bits.rxtclass;
1282 break;
1283
1284 case IPV6_FLOWINFO:
1285 val = np->rxopt.bits.rxflow;
1286 break;
1287
1288 case IPV6_RECVPATHMTU:
1289 val = np->rxopt.bits.rxpmtu;
1290 break;
1291
1292 case IPV6_PATHMTU:
1293 {
1294 struct dst_entry *dst;
1295 struct ip6_mtuinfo mtuinfo;
1296
1297 if (len < sizeof(mtuinfo))
1298 return -EINVAL;
1299
1300 len = sizeof(mtuinfo);
1301 memset(&mtuinfo, 0, sizeof(mtuinfo));
1302
1303 rcu_read_lock();
1304 dst = __sk_dst_get(sk);
1305 if (dst)
1306 mtuinfo.ip6m_mtu = dst_mtu(dst);
1307 rcu_read_unlock();
1308 if (!mtuinfo.ip6m_mtu)
1309 return -ENOTCONN;
1310
1311 if (copy_to_sockptr(optlen, &len, sizeof(int)))
1312 return -EFAULT;
1313 if (copy_to_sockptr(optval, &mtuinfo, len))
1314 return -EFAULT;
1315
1316 return 0;
1317 }
1318
1319 case IPV6_TRANSPARENT:
1320 val = inet_test_bit(TRANSPARENT, sk);
1321 break;
1322
1323 case IPV6_FREEBIND:
1324 val = inet_test_bit(FREEBIND, sk);
1325 break;
1326
1327 case IPV6_RECVORIGDSTADDR:
1328 val = np->rxopt.bits.rxorigdstaddr;
1329 break;
1330
1331 case IPV6_UNICAST_HOPS:
1332 case IPV6_MULTICAST_HOPS:
1333 {
1334 struct dst_entry *dst;
1335
1336 if (optname == IPV6_UNICAST_HOPS)
1337 val = READ_ONCE(np->hop_limit);
1338 else
1339 val = READ_ONCE(np->mcast_hops);
1340
1341 if (val < 0) {
1342 rcu_read_lock();
1343 dst = __sk_dst_get(sk);
1344 if (dst)
1345 val = ip6_dst_hoplimit(dst);
1346 rcu_read_unlock();
1347 }
1348
1349 if (val < 0)
1350 val = READ_ONCE(sock_net(sk)->ipv6.devconf_all->hop_limit);
1351 break;
1352 }
1353
1354 case IPV6_MULTICAST_LOOP:
1355 val = inet6_test_bit(MC6_LOOP, sk);
1356 break;
1357
1358 case IPV6_MULTICAST_IF:
1359 val = READ_ONCE(np->mcast_oif);
1360 break;
1361
1362 case IPV6_MULTICAST_ALL:
1363 val = inet6_test_bit(MC6_ALL, sk);
1364 break;
1365
1366 case IPV6_UNICAST_IF:
1367 val = (__force int)htonl((__u32) READ_ONCE(np->ucast_oif));
1368 break;
1369
1370 case IPV6_MTU_DISCOVER:
1371 val = READ_ONCE(np->pmtudisc);
1372 break;
1373
1374 case IPV6_RECVERR:
1375 val = inet6_test_bit(RECVERR6, sk);
1376 break;
1377
1378 case IPV6_FLOWINFO_SEND:
1379 val = inet6_test_bit(SNDFLOW, sk);
1380 break;
1381
1382 case IPV6_FLOWLABEL_MGR:
1383 {
1384 struct in6_flowlabel_req freq;
1385 int flags;
1386
1387 if (len < sizeof(freq))
1388 return -EINVAL;
1389
1390 if (copy_from_sockptr(&freq, optval, sizeof(freq)))
1391 return -EFAULT;
1392
1393 if (freq.flr_action != IPV6_FL_A_GET)
1394 return -EINVAL;
1395
1396 len = sizeof(freq);
1397 flags = freq.flr_flags;
1398
1399 memset(&freq, 0, sizeof(freq));
1400
1401 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1402 if (val < 0)
1403 return val;
1404
1405 if (copy_to_sockptr(optlen, &len, sizeof(int)))
1406 return -EFAULT;
1407 if (copy_to_sockptr(optval, &freq, len))
1408 return -EFAULT;
1409
1410 return 0;
1411 }
1412
1413 case IPV6_ADDR_PREFERENCES:
1414 {
1415 u8 srcprefs = READ_ONCE(np->srcprefs);
1416 val = 0;
1417
1418 if (srcprefs & IPV6_PREFER_SRC_TMP)
1419 val |= IPV6_PREFER_SRC_TMP;
1420 else if (srcprefs & IPV6_PREFER_SRC_PUBLIC)
1421 val |= IPV6_PREFER_SRC_PUBLIC;
1422 else {
1423 /* XXX: should we return system default? */
1424 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1425 }
1426
1427 if (srcprefs & IPV6_PREFER_SRC_COA)
1428 val |= IPV6_PREFER_SRC_COA;
1429 else
1430 val |= IPV6_PREFER_SRC_HOME;
1431 break;
1432 }
1433 case IPV6_MINHOPCOUNT:
1434 val = READ_ONCE(np->min_hopcount);
1435 break;
1436
1437 case IPV6_DONTFRAG:
1438 val = inet6_test_bit(DONTFRAG, sk);
1439 break;
1440
1441 case IPV6_AUTOFLOWLABEL:
1442 val = ip6_autoflowlabel(sock_net(sk), sk);
1443 break;
1444
1445 case IPV6_RECVFRAGSIZE:
1446 val = np->rxopt.bits.recvfragsize;
1447 break;
1448
1449 case IPV6_ROUTER_ALERT:
1450 val = inet6_test_bit(RTALERT, sk);
1451 break;
1452
1453 case IPV6_ROUTER_ALERT_ISOLATE:
1454 val = inet6_test_bit(RTALERT_ISOLATE, sk);
1455 break;
1456
1457 case IPV6_RECVERR_RFC4884:
1458 val = inet6_test_bit(RECVERR6_RFC4884, sk);
1459 break;
1460
1461 default:
1462 return -ENOPROTOOPT;
1463 }
1464 len = min_t(unsigned int, sizeof(int), len);
1465 if (copy_to_sockptr(optlen, &len, sizeof(int)))
1466 return -EFAULT;
1467 if (copy_to_sockptr(optval, &val, len))
1468 return -EFAULT;
1469 return 0;
1470}
1471
1472int ipv6_getsockopt(struct sock *sk, int level, int optname,
1473 char __user *optval, int __user *optlen)
1474{
1475 int err;
1476
1477 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1478 return ip_getsockopt(sk, level, optname, optval, optlen);
1479
1480 if (level != SOL_IPV6)
1481 return -ENOPROTOOPT;
1482
1483 err = do_ipv6_getsockopt(sk, level, optname,
1484 USER_SOCKPTR(optval), USER_SOCKPTR(optlen));
1485#ifdef CONFIG_NETFILTER
1486 /* we need to exclude all possible ENOPROTOOPTs except default case */
1487 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1488 int len;
1489
1490 if (get_user(len, optlen))
1491 return -EFAULT;
1492
1493 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1494 if (err >= 0)
1495 err = put_user(len, optlen);
1496 }
1497#endif
1498 return err;
1499}
1500EXPORT_SYMBOL(ipv6_getsockopt);