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
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
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
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
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
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
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(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);
230 out_free_gsf:
231 kfree(gsf);
232 return ret;
233 }
234
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(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
274 out_free_p:
275 kfree(p);
276 return ret;
277 }
278
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
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
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
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 /* 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;
873 update:
874 retv = 0;
875 opt = ipv6_update_options(sk, opt);
876 done:
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
970 unlock:
971 sockopt_release_sock(sk);
972 if (needs_rtnl)
973 rtnl_unlock();
974
975 return retv;
976
977 e_inval:
978 retv = -EINVAL;
979 goto unlock;
980 }
981
982 int 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 udp_prot.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 }
1002 EXPORT_SYMBOL(ipv6_setsockopt);
1003
1004 static 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
1038 static 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
1067 static 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
1106 int 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
1472 int 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 udp_prot.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 }
1500 EXPORT_SYMBOL(ipv6_getsockopt);
1501
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