1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * IPv6 BSD socket options interface
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 *
9 * Based on linux/net/ipv4/ip_sockglue.c
10 *
11 * FIXME: Make the setsockopt code POSIX compliant: That is
12 *
13 * o Truncate getsockopt returns
14 * o Return an optlen of the truncated length if need be
15 *
16 * Changes:
17 * David L Stevens <dlstevens@us.ibm.com>:
18 * - added multicast source filtering API for MLDv2
19 */
20
21 #include <linux/module.h>
22 #include <linux/capability.h>
23 #include <linux/errno.h>
24 #include <linux/types.h>
25 #include <linux/socket.h>
26 #include <linux/sockios.h>
27 #include <linux/net.h>
28 #include <linux/in6.h>
29 #include <linux/mroute6.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_arp.h>
32 #include <linux/init.h>
33 #include <linux/sysctl.h>
34 #include <linux/netfilter.h>
35 #include <linux/slab.h>
36
37 #include <net/sock.h>
38 #include <net/snmp.h>
39 #include <net/ipv6.h>
40 #include <net/ndisc.h>
41 #include <net/protocol.h>
42 #include <net/transp_v6.h>
43 #include <net/ip6_route.h>
44 #include <net/addrconf.h>
45 #include <net/inet_common.h>
46 #include <net/tcp.h>
47 #include <net/udp.h>
48 #include <net/udplite.h>
49 #include <net/xfrm.h>
50 #include <net/compat.h>
51 #include <net/seg6.h>
52
53 #include <linux/uaccess.h>
54
55 struct ip6_ra_chain *ip6_ra_chain;
56 DEFINE_RWLOCK(ip6_ra_lock);
57
58 DEFINE_STATIC_KEY_FALSE(ip6_min_hopcount);
59
ip6_ra_control(struct sock * sk,int sel)60 int ip6_ra_control(struct sock *sk, int sel)
61 {
62 struct ip6_ra_chain *ra, *new_ra, **rap;
63
64 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
65 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
66 return -ENOPROTOOPT;
67
68 new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
69 if (sel >= 0 && !new_ra)
70 return -ENOMEM;
71
72 write_lock_bh(&ip6_ra_lock);
73 for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
74 if (ra->sk == sk) {
75 if (sel >= 0) {
76 write_unlock_bh(&ip6_ra_lock);
77 kfree(new_ra);
78 return -EADDRINUSE;
79 }
80
81 *rap = ra->next;
82 write_unlock_bh(&ip6_ra_lock);
83
84 sock_put(sk);
85 kfree(ra);
86 return 0;
87 }
88 }
89 if (!new_ra) {
90 write_unlock_bh(&ip6_ra_lock);
91 return -ENOBUFS;
92 }
93 new_ra->sk = sk;
94 new_ra->sel = sel;
95 new_ra->next = ra;
96 *rap = new_ra;
97 sock_hold(sk);
98 write_unlock_bh(&ip6_ra_lock);
99 return 0;
100 }
101
ipv6_update_options(struct sock * sk,struct ipv6_txoptions * opt)102 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
103 struct ipv6_txoptions *opt)
104 {
105 if (inet_test_bit(IS_ICSK, sk)) {
106 if (opt &&
107 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
108 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
109 struct inet_connection_sock *icsk = inet_csk(sk);
110 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
111 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
112 }
113 }
114 opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
115 opt);
116 sk_dst_reset(sk);
117
118 return opt;
119 }
120
setsockopt_needs_rtnl(int optname)121 static 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
copy_group_source_from_sockptr(struct group_source_req * greqs,sockptr_t optval,int optlen)141 static 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
do_ipv6_mcast_group_source(struct sock * sk,int optname,sockptr_t optval,int optlen)164 static 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
ipv6_set_mcast_msfilter(struct sock * sk,sockptr_t optval,int optlen)205 static 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(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);
231 out_free_gsf:
232 kfree(gsf);
233 return ret;
234 }
235
compat_ipv6_set_mcast_msfilter(struct sock * sk,sockptr_t optval,int optlen)236 static 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(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
275 out_free_p:
276 kfree(p);
277 return ret;
278 }
279
ipv6_mcast_join_leave(struct sock * sk,int optname,sockptr_t optval,int optlen)280 static 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
compat_ipv6_mcast_join_leave(struct sock * sk,int optname,sockptr_t optval,int optlen)300 static 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
ipv6_set_opt_hdr(struct sock * sk,int optname,sockptr_t optval,int optlen)320 static 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);
386 sticky_done:
387 if (opt) {
388 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
389 txopt_put(opt);
390 }
391 return err;
392 }
393
do_ipv6_setsockopt(struct sock * sk,int level,int optname,sockptr_t optval,unsigned int optlen)394 int 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 if (needs_rtnl)
419 rtnl_lock();
420 sockopt_lock_sock(sk);
421
422 /* Another thread has converted the socket into IPv4 with
423 * IPV6_ADDRFORM concurrently.
424 */
425 if (unlikely(sk->sk_family != AF_INET6))
426 goto unlock;
427
428 switch (optname) {
429
430 case IPV6_ADDRFORM:
431 if (optlen < sizeof(int))
432 goto e_inval;
433 if (val == PF_INET) {
434 if (sk->sk_type == SOCK_RAW)
435 break;
436
437 if (sk->sk_protocol == IPPROTO_UDP ||
438 sk->sk_protocol == IPPROTO_UDPLITE) {
439 struct udp_sock *up = udp_sk(sk);
440 if (up->pending == AF_INET6) {
441 retv = -EBUSY;
442 break;
443 }
444 } else if (sk->sk_protocol == IPPROTO_TCP) {
445 if (sk->sk_prot != &tcpv6_prot) {
446 retv = -EBUSY;
447 break;
448 }
449 } else {
450 break;
451 }
452
453 if (sk->sk_state != TCP_ESTABLISHED) {
454 retv = -ENOTCONN;
455 break;
456 }
457
458 if (ipv6_only_sock(sk) ||
459 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
460 retv = -EADDRNOTAVAIL;
461 break;
462 }
463
464 __ipv6_sock_mc_close(sk);
465 __ipv6_sock_ac_close(sk);
466
467 if (sk->sk_protocol == IPPROTO_TCP) {
468 struct inet_connection_sock *icsk = inet_csk(sk);
469
470 sock_prot_inuse_add(net, sk->sk_prot, -1);
471 sock_prot_inuse_add(net, &tcp_prot, 1);
472
473 /* Paired with READ_ONCE(sk->sk_prot) in inet6_stream_ops */
474 WRITE_ONCE(sk->sk_prot, &tcp_prot);
475 /* Paired with READ_ONCE() in tcp_(get|set)sockopt() */
476 WRITE_ONCE(icsk->icsk_af_ops, &ipv4_specific);
477 WRITE_ONCE(sk->sk_socket->ops, &inet_stream_ops);
478 WRITE_ONCE(sk->sk_family, PF_INET);
479 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
480 } else {
481 struct proto *prot = &udp_prot;
482
483 if (sk->sk_protocol == IPPROTO_UDPLITE)
484 prot = &udplite_prot;
485
486 sock_prot_inuse_add(net, sk->sk_prot, -1);
487 sock_prot_inuse_add(net, prot, 1);
488
489 /* Paired with READ_ONCE(sk->sk_prot) in inet6_dgram_ops */
490 WRITE_ONCE(sk->sk_prot, prot);
491 WRITE_ONCE(sk->sk_socket->ops, &inet_dgram_ops);
492 WRITE_ONCE(sk->sk_family, PF_INET);
493 }
494
495 /* Disable all options not to allocate memory anymore,
496 * but there is still a race. See the lockless path
497 * in udpv6_sendmsg() and ipv6_local_rxpmtu().
498 */
499 np->rxopt.all = 0;
500
501 inet6_cleanup_sock(sk);
502
503 module_put(THIS_MODULE);
504 retv = 0;
505 break;
506 }
507 goto e_inval;
508
509 case IPV6_V6ONLY:
510 if (optlen < sizeof(int) ||
511 inet_sk(sk)->inet_num)
512 goto e_inval;
513 sk->sk_ipv6only = valbool;
514 retv = 0;
515 break;
516
517 case IPV6_RECVPKTINFO:
518 if (optlen < sizeof(int))
519 goto e_inval;
520 np->rxopt.bits.rxinfo = valbool;
521 retv = 0;
522 break;
523
524 case IPV6_2292PKTINFO:
525 if (optlen < sizeof(int))
526 goto e_inval;
527 np->rxopt.bits.rxoinfo = valbool;
528 retv = 0;
529 break;
530
531 case IPV6_RECVHOPLIMIT:
532 if (optlen < sizeof(int))
533 goto e_inval;
534 np->rxopt.bits.rxhlim = valbool;
535 retv = 0;
536 break;
537
538 case IPV6_2292HOPLIMIT:
539 if (optlen < sizeof(int))
540 goto e_inval;
541 np->rxopt.bits.rxohlim = valbool;
542 retv = 0;
543 break;
544
545 case IPV6_RECVRTHDR:
546 if (optlen < sizeof(int))
547 goto e_inval;
548 np->rxopt.bits.srcrt = valbool;
549 retv = 0;
550 break;
551
552 case IPV6_2292RTHDR:
553 if (optlen < sizeof(int))
554 goto e_inval;
555 np->rxopt.bits.osrcrt = valbool;
556 retv = 0;
557 break;
558
559 case IPV6_RECVHOPOPTS:
560 if (optlen < sizeof(int))
561 goto e_inval;
562 np->rxopt.bits.hopopts = valbool;
563 retv = 0;
564 break;
565
566 case IPV6_2292HOPOPTS:
567 if (optlen < sizeof(int))
568 goto e_inval;
569 np->rxopt.bits.ohopopts = valbool;
570 retv = 0;
571 break;
572
573 case IPV6_RECVDSTOPTS:
574 if (optlen < sizeof(int))
575 goto e_inval;
576 np->rxopt.bits.dstopts = valbool;
577 retv = 0;
578 break;
579
580 case IPV6_2292DSTOPTS:
581 if (optlen < sizeof(int))
582 goto e_inval;
583 np->rxopt.bits.odstopts = valbool;
584 retv = 0;
585 break;
586
587 case IPV6_TCLASS:
588 if (optlen < sizeof(int))
589 goto e_inval;
590 if (val < -1 || val > 0xff)
591 goto e_inval;
592 /* RFC 3542, 6.5: default traffic class of 0x0 */
593 if (val == -1)
594 val = 0;
595 if (sk->sk_type == SOCK_STREAM) {
596 val &= ~INET_ECN_MASK;
597 val |= np->tclass & INET_ECN_MASK;
598 }
599 if (np->tclass != val) {
600 np->tclass = val;
601 sk_dst_reset(sk);
602 }
603 retv = 0;
604 break;
605
606 case IPV6_RECVTCLASS:
607 if (optlen < sizeof(int))
608 goto e_inval;
609 np->rxopt.bits.rxtclass = valbool;
610 retv = 0;
611 break;
612
613 case IPV6_FLOWINFO:
614 if (optlen < sizeof(int))
615 goto e_inval;
616 np->rxopt.bits.rxflow = valbool;
617 retv = 0;
618 break;
619
620 case IPV6_RECVPATHMTU:
621 if (optlen < sizeof(int))
622 goto e_inval;
623 np->rxopt.bits.rxpmtu = valbool;
624 retv = 0;
625 break;
626
627 case IPV6_TRANSPARENT:
628 if (valbool && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW) &&
629 !sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) {
630 retv = -EPERM;
631 break;
632 }
633 if (optlen < sizeof(int))
634 goto e_inval;
635 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
636 inet_assign_bit(TRANSPARENT, sk, valbool);
637 retv = 0;
638 break;
639
640 case IPV6_FREEBIND:
641 if (optlen < sizeof(int))
642 goto e_inval;
643 /* we also don't have a separate freebind bit for IPV6 */
644 inet_assign_bit(FREEBIND, sk, valbool);
645 retv = 0;
646 break;
647
648 case IPV6_RECVORIGDSTADDR:
649 if (optlen < sizeof(int))
650 goto e_inval;
651 np->rxopt.bits.rxorigdstaddr = valbool;
652 retv = 0;
653 break;
654
655 case IPV6_HOPOPTS:
656 case IPV6_RTHDRDSTOPTS:
657 case IPV6_RTHDR:
658 case IPV6_DSTOPTS:
659 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen);
660 break;
661
662 case IPV6_PKTINFO:
663 {
664 struct in6_pktinfo pkt;
665
666 if (optlen == 0)
667 goto e_inval;
668 else if (optlen < sizeof(struct in6_pktinfo) ||
669 sockptr_is_null(optval))
670 goto e_inval;
671
672 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) {
673 retv = -EFAULT;
674 break;
675 }
676 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
677 goto e_inval;
678
679 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
680 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
681 retv = 0;
682 break;
683 }
684
685 case IPV6_2292PKTOPTIONS:
686 {
687 struct ipv6_txoptions *opt = NULL;
688 struct msghdr msg;
689 struct flowi6 fl6;
690 struct ipcm6_cookie ipc6;
691
692 memset(&fl6, 0, sizeof(fl6));
693 fl6.flowi6_oif = sk->sk_bound_dev_if;
694 fl6.flowi6_mark = sk->sk_mark;
695
696 if (optlen == 0)
697 goto update;
698
699 /* 1K is probably excessive
700 * 1K is surely not enough, 2K per standard header is 16K.
701 */
702 retv = -EINVAL;
703 if (optlen > 64*1024)
704 break;
705
706 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
707 retv = -ENOBUFS;
708 if (!opt)
709 break;
710
711 memset(opt, 0, sizeof(*opt));
712 refcount_set(&opt->refcnt, 1);
713 opt->tot_len = sizeof(*opt) + optlen;
714 retv = -EFAULT;
715 if (copy_from_sockptr(opt + 1, optval, optlen))
716 goto done;
717
718 msg.msg_controllen = optlen;
719 msg.msg_control_is_user = false;
720 msg.msg_control = (void *)(opt+1);
721 ipc6.opt = opt;
722
723 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
724 if (retv)
725 goto done;
726 update:
727 retv = 0;
728 opt = ipv6_update_options(sk, opt);
729 done:
730 if (opt) {
731 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
732 txopt_put(opt);
733 }
734 break;
735 }
736 case IPV6_UNICAST_HOPS:
737 if (optlen < sizeof(int))
738 goto e_inval;
739 if (val > 255 || val < -1)
740 goto e_inval;
741 np->hop_limit = val;
742 retv = 0;
743 break;
744
745 case IPV6_MULTICAST_HOPS:
746 if (sk->sk_type == SOCK_STREAM)
747 break;
748 if (optlen < sizeof(int))
749 goto e_inval;
750 if (val > 255 || val < -1)
751 goto e_inval;
752 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
753 retv = 0;
754 break;
755
756 case IPV6_MULTICAST_LOOP:
757 if (optlen < sizeof(int))
758 goto e_inval;
759 if (val != valbool)
760 goto e_inval;
761 np->mc_loop = valbool;
762 retv = 0;
763 break;
764
765 case IPV6_UNICAST_IF:
766 {
767 struct net_device *dev = NULL;
768 int ifindex;
769
770 if (optlen != sizeof(int))
771 goto e_inval;
772
773 ifindex = (__force int)ntohl((__force __be32)val);
774 if (ifindex == 0) {
775 np->ucast_oif = 0;
776 retv = 0;
777 break;
778 }
779
780 dev = dev_get_by_index(net, ifindex);
781 retv = -EADDRNOTAVAIL;
782 if (!dev)
783 break;
784 dev_put(dev);
785
786 retv = -EINVAL;
787 if (sk->sk_bound_dev_if)
788 break;
789
790 np->ucast_oif = ifindex;
791 retv = 0;
792 break;
793 }
794
795 case IPV6_MULTICAST_IF:
796 if (sk->sk_type == SOCK_STREAM)
797 break;
798 if (optlen < sizeof(int))
799 goto e_inval;
800
801 if (val) {
802 struct net_device *dev;
803 int midx;
804
805 rcu_read_lock();
806
807 dev = dev_get_by_index_rcu(net, val);
808 if (!dev) {
809 rcu_read_unlock();
810 retv = -ENODEV;
811 break;
812 }
813 midx = l3mdev_master_ifindex_rcu(dev);
814
815 rcu_read_unlock();
816
817 if (sk->sk_bound_dev_if &&
818 sk->sk_bound_dev_if != val &&
819 (!midx || midx != sk->sk_bound_dev_if))
820 goto e_inval;
821 }
822 np->mcast_oif = val;
823 retv = 0;
824 break;
825 case IPV6_ADD_MEMBERSHIP:
826 case IPV6_DROP_MEMBERSHIP:
827 {
828 struct ipv6_mreq mreq;
829
830 if (optlen < sizeof(struct ipv6_mreq))
831 goto e_inval;
832
833 retv = -EPROTO;
834 if (inet_test_bit(IS_ICSK, sk))
835 break;
836
837 retv = -EFAULT;
838 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
839 break;
840
841 if (optname == IPV6_ADD_MEMBERSHIP)
842 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
843 else
844 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
845 break;
846 }
847 case IPV6_JOIN_ANYCAST:
848 case IPV6_LEAVE_ANYCAST:
849 {
850 struct ipv6_mreq mreq;
851
852 if (optlen < sizeof(struct ipv6_mreq))
853 goto e_inval;
854
855 retv = -EFAULT;
856 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
857 break;
858
859 if (optname == IPV6_JOIN_ANYCAST)
860 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
861 else
862 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
863 break;
864 }
865 case IPV6_MULTICAST_ALL:
866 if (optlen < sizeof(int))
867 goto e_inval;
868 np->mc_all = valbool;
869 retv = 0;
870 break;
871
872 case MCAST_JOIN_GROUP:
873 case MCAST_LEAVE_GROUP:
874 if (in_compat_syscall())
875 retv = compat_ipv6_mcast_join_leave(sk, optname, optval,
876 optlen);
877 else
878 retv = ipv6_mcast_join_leave(sk, optname, optval,
879 optlen);
880 break;
881 case MCAST_JOIN_SOURCE_GROUP:
882 case MCAST_LEAVE_SOURCE_GROUP:
883 case MCAST_BLOCK_SOURCE:
884 case MCAST_UNBLOCK_SOURCE:
885 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen);
886 break;
887 case MCAST_MSFILTER:
888 if (in_compat_syscall())
889 retv = compat_ipv6_set_mcast_msfilter(sk, optval,
890 optlen);
891 else
892 retv = ipv6_set_mcast_msfilter(sk, optval, optlen);
893 break;
894 case IPV6_ROUTER_ALERT:
895 if (optlen < sizeof(int))
896 goto e_inval;
897 retv = ip6_ra_control(sk, val);
898 break;
899 case IPV6_ROUTER_ALERT_ISOLATE:
900 if (optlen < sizeof(int))
901 goto e_inval;
902 np->rtalert_isolate = valbool;
903 retv = 0;
904 break;
905 case IPV6_MTU_DISCOVER:
906 if (optlen < sizeof(int))
907 goto e_inval;
908 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
909 goto e_inval;
910 np->pmtudisc = val;
911 retv = 0;
912 break;
913 case IPV6_MTU:
914 if (optlen < sizeof(int))
915 goto e_inval;
916 if (val && val < IPV6_MIN_MTU)
917 goto e_inval;
918 np->frag_size = val;
919 retv = 0;
920 break;
921 case IPV6_RECVERR:
922 if (optlen < sizeof(int))
923 goto e_inval;
924 np->recverr = valbool;
925 if (!val)
926 skb_errqueue_purge(&sk->sk_error_queue);
927 retv = 0;
928 break;
929 case IPV6_FLOWINFO_SEND:
930 if (optlen < sizeof(int))
931 goto e_inval;
932 np->sndflow = valbool;
933 retv = 0;
934 break;
935 case IPV6_FLOWLABEL_MGR:
936 retv = ipv6_flowlabel_opt(sk, optval, optlen);
937 break;
938 case IPV6_IPSEC_POLICY:
939 case IPV6_XFRM_POLICY:
940 retv = -EPERM;
941 if (!sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN))
942 break;
943 retv = xfrm_user_policy(sk, optname, optval, optlen);
944 break;
945
946 case IPV6_ADDR_PREFERENCES:
947 if (optlen < sizeof(int))
948 goto e_inval;
949 retv = __ip6_sock_set_addr_preferences(sk, val);
950 break;
951 case IPV6_MINHOPCOUNT:
952 if (optlen < sizeof(int))
953 goto e_inval;
954 if (val < 0 || val > 255)
955 goto e_inval;
956
957 if (val)
958 static_branch_enable(&ip6_min_hopcount);
959
960 /* tcp_v6_err() and tcp_v6_rcv() might read min_hopcount
961 * while we are changing it.
962 */
963 WRITE_ONCE(np->min_hopcount, val);
964 retv = 0;
965 break;
966 case IPV6_DONTFRAG:
967 np->dontfrag = valbool;
968 retv = 0;
969 break;
970 case IPV6_AUTOFLOWLABEL:
971 np->autoflowlabel = valbool;
972 np->autoflowlabel_set = 1;
973 retv = 0;
974 break;
975 case IPV6_RECVFRAGSIZE:
976 np->rxopt.bits.recvfragsize = valbool;
977 retv = 0;
978 break;
979 case IPV6_RECVERR_RFC4884:
980 if (optlen < sizeof(int))
981 goto e_inval;
982 if (val < 0 || val > 1)
983 goto e_inval;
984 np->recverr_rfc4884 = valbool;
985 retv = 0;
986 break;
987 }
988
989 unlock:
990 sockopt_release_sock(sk);
991 if (needs_rtnl)
992 rtnl_unlock();
993
994 return retv;
995
996 e_inval:
997 retv = -EINVAL;
998 goto unlock;
999 }
1000
ipv6_setsockopt(struct sock * sk,int level,int optname,sockptr_t optval,unsigned int optlen)1001 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1002 unsigned int optlen)
1003 {
1004 int err;
1005
1006 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1007 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
1008
1009 if (level != SOL_IPV6)
1010 return -ENOPROTOOPT;
1011
1012 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
1013 #ifdef CONFIG_NETFILTER
1014 /* we need to exclude all possible ENOPROTOOPTs except default case */
1015 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
1016 optname != IPV6_XFRM_POLICY)
1017 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
1018 #endif
1019 return err;
1020 }
1021 EXPORT_SYMBOL(ipv6_setsockopt);
1022
ipv6_getsockopt_sticky(struct sock * sk,struct ipv6_txoptions * opt,int optname,sockptr_t optval,int len)1023 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
1024 int optname, sockptr_t optval, int len)
1025 {
1026 struct ipv6_opt_hdr *hdr;
1027
1028 if (!opt)
1029 return 0;
1030
1031 switch (optname) {
1032 case IPV6_HOPOPTS:
1033 hdr = opt->hopopt;
1034 break;
1035 case IPV6_RTHDRDSTOPTS:
1036 hdr = opt->dst0opt;
1037 break;
1038 case IPV6_RTHDR:
1039 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1040 break;
1041 case IPV6_DSTOPTS:
1042 hdr = opt->dst1opt;
1043 break;
1044 default:
1045 return -EINVAL; /* should not happen */
1046 }
1047
1048 if (!hdr)
1049 return 0;
1050
1051 len = min_t(unsigned int, len, ipv6_optlen(hdr));
1052 if (copy_to_sockptr(optval, hdr, len))
1053 return -EFAULT;
1054 return len;
1055 }
1056
ipv6_get_msfilter(struct sock * sk,sockptr_t optval,sockptr_t optlen,int len)1057 static int ipv6_get_msfilter(struct sock *sk, sockptr_t optval,
1058 sockptr_t optlen, int len)
1059 {
1060 const int size0 = offsetof(struct group_filter, gf_slist_flex);
1061 struct group_filter gsf;
1062 int num;
1063 int err;
1064
1065 if (len < size0)
1066 return -EINVAL;
1067 if (copy_from_sockptr(&gsf, optval, size0))
1068 return -EFAULT;
1069 if (gsf.gf_group.ss_family != AF_INET6)
1070 return -EADDRNOTAVAIL;
1071 num = gsf.gf_numsrc;
1072 sockopt_lock_sock(sk);
1073 err = ip6_mc_msfget(sk, &gsf, optval, size0);
1074 if (!err) {
1075 if (num > gsf.gf_numsrc)
1076 num = gsf.gf_numsrc;
1077 len = GROUP_FILTER_SIZE(num);
1078 if (copy_to_sockptr(optlen, &len, sizeof(int)) ||
1079 copy_to_sockptr(optval, &gsf, size0))
1080 err = -EFAULT;
1081 }
1082 sockopt_release_sock(sk);
1083 return err;
1084 }
1085
compat_ipv6_get_msfilter(struct sock * sk,sockptr_t optval,sockptr_t optlen,int len)1086 static int compat_ipv6_get_msfilter(struct sock *sk, sockptr_t optval,
1087 sockptr_t optlen, int len)
1088 {
1089 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
1090 struct compat_group_filter gf32;
1091 struct group_filter gf;
1092 int err;
1093 int num;
1094
1095 if (len < size0)
1096 return -EINVAL;
1097
1098 if (copy_from_sockptr(&gf32, optval, size0))
1099 return -EFAULT;
1100 gf.gf_interface = gf32.gf_interface;
1101 gf.gf_fmode = gf32.gf_fmode;
1102 num = gf.gf_numsrc = gf32.gf_numsrc;
1103 gf.gf_group = gf32.gf_group;
1104
1105 if (gf.gf_group.ss_family != AF_INET6)
1106 return -EADDRNOTAVAIL;
1107
1108 sockopt_lock_sock(sk);
1109 err = ip6_mc_msfget(sk, &gf, optval, size0);
1110 sockopt_release_sock(sk);
1111 if (err)
1112 return err;
1113 if (num > gf.gf_numsrc)
1114 num = gf.gf_numsrc;
1115 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32));
1116 if (copy_to_sockptr(optlen, &len, sizeof(int)) ||
1117 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_fmode),
1118 &gf.gf_fmode, sizeof(gf32.gf_fmode)) ||
1119 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_numsrc),
1120 &gf.gf_numsrc, sizeof(gf32.gf_numsrc)))
1121 return -EFAULT;
1122 return 0;
1123 }
1124
do_ipv6_getsockopt(struct sock * sk,int level,int optname,sockptr_t optval,sockptr_t optlen)1125 int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1126 sockptr_t optval, sockptr_t optlen)
1127 {
1128 struct ipv6_pinfo *np = inet6_sk(sk);
1129 int len;
1130 int val;
1131
1132 if (ip6_mroute_opt(optname))
1133 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1134
1135 if (copy_from_sockptr(&len, optlen, sizeof(int)))
1136 return -EFAULT;
1137 switch (optname) {
1138 case IPV6_ADDRFORM:
1139 if (sk->sk_protocol != IPPROTO_UDP &&
1140 sk->sk_protocol != IPPROTO_UDPLITE &&
1141 sk->sk_protocol != IPPROTO_TCP)
1142 return -ENOPROTOOPT;
1143 if (sk->sk_state != TCP_ESTABLISHED)
1144 return -ENOTCONN;
1145 val = sk->sk_family;
1146 break;
1147 case MCAST_MSFILTER:
1148 if (in_compat_syscall())
1149 return compat_ipv6_get_msfilter(sk, optval, optlen, len);
1150 return ipv6_get_msfilter(sk, optval, optlen, len);
1151 case IPV6_2292PKTOPTIONS:
1152 {
1153 struct msghdr msg;
1154 struct sk_buff *skb;
1155
1156 if (sk->sk_type != SOCK_STREAM)
1157 return -ENOPROTOOPT;
1158
1159 if (optval.is_kernel) {
1160 msg.msg_control_is_user = false;
1161 msg.msg_control = optval.kernel;
1162 } else {
1163 msg.msg_control_is_user = true;
1164 msg.msg_control_user = optval.user;
1165 }
1166 msg.msg_controllen = len;
1167 msg.msg_flags = 0;
1168
1169 sockopt_lock_sock(sk);
1170 skb = np->pktoptions;
1171 if (skb)
1172 ip6_datagram_recv_ctl(sk, &msg, skb);
1173 sockopt_release_sock(sk);
1174 if (!skb) {
1175 if (np->rxopt.bits.rxinfo) {
1176 struct in6_pktinfo src_info;
1177 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1178 np->sticky_pktinfo.ipi6_ifindex;
1179 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1180 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1181 }
1182 if (np->rxopt.bits.rxhlim) {
1183 int hlim = np->mcast_hops;
1184 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1185 }
1186 if (np->rxopt.bits.rxtclass) {
1187 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1188
1189 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1190 }
1191 if (np->rxopt.bits.rxoinfo) {
1192 struct in6_pktinfo src_info;
1193 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1194 np->sticky_pktinfo.ipi6_ifindex;
1195 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1196 np->sticky_pktinfo.ipi6_addr;
1197 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1198 }
1199 if (np->rxopt.bits.rxohlim) {
1200 int hlim = np->mcast_hops;
1201 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1202 }
1203 if (np->rxopt.bits.rxflow) {
1204 __be32 flowinfo = np->rcv_flowinfo;
1205
1206 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1207 }
1208 }
1209 len -= msg.msg_controllen;
1210 return copy_to_sockptr(optlen, &len, sizeof(int));
1211 }
1212 case IPV6_MTU:
1213 {
1214 struct dst_entry *dst;
1215
1216 val = 0;
1217 rcu_read_lock();
1218 dst = __sk_dst_get(sk);
1219 if (dst)
1220 val = dst_mtu(dst);
1221 rcu_read_unlock();
1222 if (!val)
1223 return -ENOTCONN;
1224 break;
1225 }
1226
1227 case IPV6_V6ONLY:
1228 val = sk->sk_ipv6only;
1229 break;
1230
1231 case IPV6_RECVPKTINFO:
1232 val = np->rxopt.bits.rxinfo;
1233 break;
1234
1235 case IPV6_2292PKTINFO:
1236 val = np->rxopt.bits.rxoinfo;
1237 break;
1238
1239 case IPV6_RECVHOPLIMIT:
1240 val = np->rxopt.bits.rxhlim;
1241 break;
1242
1243 case IPV6_2292HOPLIMIT:
1244 val = np->rxopt.bits.rxohlim;
1245 break;
1246
1247 case IPV6_RECVRTHDR:
1248 val = np->rxopt.bits.srcrt;
1249 break;
1250
1251 case IPV6_2292RTHDR:
1252 val = np->rxopt.bits.osrcrt;
1253 break;
1254
1255 case IPV6_HOPOPTS:
1256 case IPV6_RTHDRDSTOPTS:
1257 case IPV6_RTHDR:
1258 case IPV6_DSTOPTS:
1259 {
1260 struct ipv6_txoptions *opt;
1261
1262 sockopt_lock_sock(sk);
1263 opt = rcu_dereference_protected(np->opt,
1264 lockdep_sock_is_held(sk));
1265 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1266 sockopt_release_sock(sk);
1267 /* check if ipv6_getsockopt_sticky() returns err code */
1268 if (len < 0)
1269 return len;
1270 return copy_to_sockptr(optlen, &len, sizeof(int));
1271 }
1272
1273 case IPV6_RECVHOPOPTS:
1274 val = np->rxopt.bits.hopopts;
1275 break;
1276
1277 case IPV6_2292HOPOPTS:
1278 val = np->rxopt.bits.ohopopts;
1279 break;
1280
1281 case IPV6_RECVDSTOPTS:
1282 val = np->rxopt.bits.dstopts;
1283 break;
1284
1285 case IPV6_2292DSTOPTS:
1286 val = np->rxopt.bits.odstopts;
1287 break;
1288
1289 case IPV6_TCLASS:
1290 val = np->tclass;
1291 break;
1292
1293 case IPV6_RECVTCLASS:
1294 val = np->rxopt.bits.rxtclass;
1295 break;
1296
1297 case IPV6_FLOWINFO:
1298 val = np->rxopt.bits.rxflow;
1299 break;
1300
1301 case IPV6_RECVPATHMTU:
1302 val = np->rxopt.bits.rxpmtu;
1303 break;
1304
1305 case IPV6_PATHMTU:
1306 {
1307 struct dst_entry *dst;
1308 struct ip6_mtuinfo mtuinfo;
1309
1310 if (len < sizeof(mtuinfo))
1311 return -EINVAL;
1312
1313 len = sizeof(mtuinfo);
1314 memset(&mtuinfo, 0, sizeof(mtuinfo));
1315
1316 rcu_read_lock();
1317 dst = __sk_dst_get(sk);
1318 if (dst)
1319 mtuinfo.ip6m_mtu = dst_mtu(dst);
1320 rcu_read_unlock();
1321 if (!mtuinfo.ip6m_mtu)
1322 return -ENOTCONN;
1323
1324 if (copy_to_sockptr(optlen, &len, sizeof(int)))
1325 return -EFAULT;
1326 if (copy_to_sockptr(optval, &mtuinfo, len))
1327 return -EFAULT;
1328
1329 return 0;
1330 }
1331
1332 case IPV6_TRANSPARENT:
1333 val = inet_test_bit(TRANSPARENT, sk);
1334 break;
1335
1336 case IPV6_FREEBIND:
1337 val = inet_test_bit(FREEBIND, sk);
1338 break;
1339
1340 case IPV6_RECVORIGDSTADDR:
1341 val = np->rxopt.bits.rxorigdstaddr;
1342 break;
1343
1344 case IPV6_UNICAST_HOPS:
1345 case IPV6_MULTICAST_HOPS:
1346 {
1347 struct dst_entry *dst;
1348
1349 if (optname == IPV6_UNICAST_HOPS)
1350 val = np->hop_limit;
1351 else
1352 val = np->mcast_hops;
1353
1354 if (val < 0) {
1355 rcu_read_lock();
1356 dst = __sk_dst_get(sk);
1357 if (dst)
1358 val = ip6_dst_hoplimit(dst);
1359 rcu_read_unlock();
1360 }
1361
1362 if (val < 0)
1363 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1364 break;
1365 }
1366
1367 case IPV6_MULTICAST_LOOP:
1368 val = np->mc_loop;
1369 break;
1370
1371 case IPV6_MULTICAST_IF:
1372 val = np->mcast_oif;
1373 break;
1374
1375 case IPV6_MULTICAST_ALL:
1376 val = np->mc_all;
1377 break;
1378
1379 case IPV6_UNICAST_IF:
1380 val = (__force int)htonl((__u32) np->ucast_oif);
1381 break;
1382
1383 case IPV6_MTU_DISCOVER:
1384 val = np->pmtudisc;
1385 break;
1386
1387 case IPV6_RECVERR:
1388 val = np->recverr;
1389 break;
1390
1391 case IPV6_FLOWINFO_SEND:
1392 val = np->sndflow;
1393 break;
1394
1395 case IPV6_FLOWLABEL_MGR:
1396 {
1397 struct in6_flowlabel_req freq;
1398 int flags;
1399
1400 if (len < sizeof(freq))
1401 return -EINVAL;
1402
1403 if (copy_from_sockptr(&freq, optval, sizeof(freq)))
1404 return -EFAULT;
1405
1406 if (freq.flr_action != IPV6_FL_A_GET)
1407 return -EINVAL;
1408
1409 len = sizeof(freq);
1410 flags = freq.flr_flags;
1411
1412 memset(&freq, 0, sizeof(freq));
1413
1414 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1415 if (val < 0)
1416 return val;
1417
1418 if (copy_to_sockptr(optlen, &len, sizeof(int)))
1419 return -EFAULT;
1420 if (copy_to_sockptr(optval, &freq, len))
1421 return -EFAULT;
1422
1423 return 0;
1424 }
1425
1426 case IPV6_ADDR_PREFERENCES:
1427 val = 0;
1428
1429 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1430 val |= IPV6_PREFER_SRC_TMP;
1431 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1432 val |= IPV6_PREFER_SRC_PUBLIC;
1433 else {
1434 /* XXX: should we return system default? */
1435 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1436 }
1437
1438 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1439 val |= IPV6_PREFER_SRC_COA;
1440 else
1441 val |= IPV6_PREFER_SRC_HOME;
1442 break;
1443
1444 case IPV6_MINHOPCOUNT:
1445 val = np->min_hopcount;
1446 break;
1447
1448 case IPV6_DONTFRAG:
1449 val = np->dontfrag;
1450 break;
1451
1452 case IPV6_AUTOFLOWLABEL:
1453 val = ip6_autoflowlabel(sock_net(sk), np);
1454 break;
1455
1456 case IPV6_RECVFRAGSIZE:
1457 val = np->rxopt.bits.recvfragsize;
1458 break;
1459
1460 case IPV6_ROUTER_ALERT_ISOLATE:
1461 val = np->rtalert_isolate;
1462 break;
1463
1464 case IPV6_RECVERR_RFC4884:
1465 val = np->recverr_rfc4884;
1466 break;
1467
1468 default:
1469 return -ENOPROTOOPT;
1470 }
1471 len = min_t(unsigned int, sizeof(int), len);
1472 if (copy_to_sockptr(optlen, &len, sizeof(int)))
1473 return -EFAULT;
1474 if (copy_to_sockptr(optval, &val, len))
1475 return -EFAULT;
1476 return 0;
1477 }
1478
ipv6_getsockopt(struct sock * sk,int level,int optname,char __user * optval,int __user * optlen)1479 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1480 char __user *optval, int __user *optlen)
1481 {
1482 int err;
1483
1484 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1485 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1486
1487 if (level != SOL_IPV6)
1488 return -ENOPROTOOPT;
1489
1490 err = do_ipv6_getsockopt(sk, level, optname,
1491 USER_SOCKPTR(optval), USER_SOCKPTR(optlen));
1492 #ifdef CONFIG_NETFILTER
1493 /* we need to exclude all possible ENOPROTOOPTs except default case */
1494 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1495 int len;
1496
1497 if (get_user(len, optlen))
1498 return -EFAULT;
1499
1500 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1501 if (err >= 0)
1502 err = put_user(len, optlen);
1503 }
1504 #endif
1505 return err;
1506 }
1507 EXPORT_SYMBOL(ipv6_getsockopt);
1508