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_sk(sk)->is_icsk) {
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 /*
468 * Sock is moving from IPv6 to IPv4 (sk_prot), so
469 * remove it from the refcnt debug socks count in the
470 * original family...
471 */
472 sk_refcnt_debug_dec(sk);
473
474 if (sk->sk_protocol == IPPROTO_TCP) {
475 struct inet_connection_sock *icsk = inet_csk(sk);
476
477 sock_prot_inuse_add(net, sk->sk_prot, -1);
478 sock_prot_inuse_add(net, &tcp_prot, 1);
479
480 /* Paired with READ_ONCE(sk->sk_prot) in inet6_stream_ops */
481 WRITE_ONCE(sk->sk_prot, &tcp_prot);
482 /* Paired with READ_ONCE() in tcp_(get|set)sockopt() */
483 WRITE_ONCE(icsk->icsk_af_ops, &ipv4_specific);
484 sk->sk_socket->ops = &inet_stream_ops;
485 sk->sk_family = PF_INET;
486 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
487 } else {
488 struct proto *prot = &udp_prot;
489
490 if (sk->sk_protocol == IPPROTO_UDPLITE)
491 prot = &udplite_prot;
492
493 sock_prot_inuse_add(net, sk->sk_prot, -1);
494 sock_prot_inuse_add(net, prot, 1);
495
496 /* Paired with READ_ONCE(sk->sk_prot) in inet6_dgram_ops */
497 WRITE_ONCE(sk->sk_prot, prot);
498 sk->sk_socket->ops = &inet_dgram_ops;
499 sk->sk_family = PF_INET;
500 }
501
502 /* Disable all options not to allocate memory anymore,
503 * but there is still a race. See the lockless path
504 * in udpv6_sendmsg() and ipv6_local_rxpmtu().
505 */
506 np->rxopt.all = 0;
507
508 inet6_cleanup_sock(sk);
509
510 /*
511 * ... and add it to the refcnt debug socks count
512 * in the new family. -acme
513 */
514 sk_refcnt_debug_inc(sk);
515 module_put(THIS_MODULE);
516 retv = 0;
517 break;
518 }
519 goto e_inval;
520
521 case IPV6_V6ONLY:
522 if (optlen < sizeof(int) ||
523 inet_sk(sk)->inet_num)
524 goto e_inval;
525 sk->sk_ipv6only = valbool;
526 retv = 0;
527 break;
528
529 case IPV6_RECVPKTINFO:
530 if (optlen < sizeof(int))
531 goto e_inval;
532 np->rxopt.bits.rxinfo = valbool;
533 retv = 0;
534 break;
535
536 case IPV6_2292PKTINFO:
537 if (optlen < sizeof(int))
538 goto e_inval;
539 np->rxopt.bits.rxoinfo = valbool;
540 retv = 0;
541 break;
542
543 case IPV6_RECVHOPLIMIT:
544 if (optlen < sizeof(int))
545 goto e_inval;
546 np->rxopt.bits.rxhlim = valbool;
547 retv = 0;
548 break;
549
550 case IPV6_2292HOPLIMIT:
551 if (optlen < sizeof(int))
552 goto e_inval;
553 np->rxopt.bits.rxohlim = valbool;
554 retv = 0;
555 break;
556
557 case IPV6_RECVRTHDR:
558 if (optlen < sizeof(int))
559 goto e_inval;
560 np->rxopt.bits.srcrt = valbool;
561 retv = 0;
562 break;
563
564 case IPV6_2292RTHDR:
565 if (optlen < sizeof(int))
566 goto e_inval;
567 np->rxopt.bits.osrcrt = valbool;
568 retv = 0;
569 break;
570
571 case IPV6_RECVHOPOPTS:
572 if (optlen < sizeof(int))
573 goto e_inval;
574 np->rxopt.bits.hopopts = valbool;
575 retv = 0;
576 break;
577
578 case IPV6_2292HOPOPTS:
579 if (optlen < sizeof(int))
580 goto e_inval;
581 np->rxopt.bits.ohopopts = valbool;
582 retv = 0;
583 break;
584
585 case IPV6_RECVDSTOPTS:
586 if (optlen < sizeof(int))
587 goto e_inval;
588 np->rxopt.bits.dstopts = valbool;
589 retv = 0;
590 break;
591
592 case IPV6_2292DSTOPTS:
593 if (optlen < sizeof(int))
594 goto e_inval;
595 np->rxopt.bits.odstopts = valbool;
596 retv = 0;
597 break;
598
599 case IPV6_TCLASS:
600 if (optlen < sizeof(int))
601 goto e_inval;
602 if (val < -1 || val > 0xff)
603 goto e_inval;
604 /* RFC 3542, 6.5: default traffic class of 0x0 */
605 if (val == -1)
606 val = 0;
607 if (sk->sk_type == SOCK_STREAM) {
608 val &= ~INET_ECN_MASK;
609 val |= np->tclass & INET_ECN_MASK;
610 }
611 if (np->tclass != val) {
612 np->tclass = val;
613 sk_dst_reset(sk);
614 }
615 retv = 0;
616 break;
617
618 case IPV6_RECVTCLASS:
619 if (optlen < sizeof(int))
620 goto e_inval;
621 np->rxopt.bits.rxtclass = valbool;
622 retv = 0;
623 break;
624
625 case IPV6_FLOWINFO:
626 if (optlen < sizeof(int))
627 goto e_inval;
628 np->rxopt.bits.rxflow = valbool;
629 retv = 0;
630 break;
631
632 case IPV6_RECVPATHMTU:
633 if (optlen < sizeof(int))
634 goto e_inval;
635 np->rxopt.bits.rxpmtu = valbool;
636 retv = 0;
637 break;
638
639 case IPV6_TRANSPARENT:
640 if (valbool && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW) &&
641 !sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) {
642 retv = -EPERM;
643 break;
644 }
645 if (optlen < sizeof(int))
646 goto e_inval;
647 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
648 inet_sk(sk)->transparent = valbool;
649 retv = 0;
650 break;
651
652 case IPV6_FREEBIND:
653 if (optlen < sizeof(int))
654 goto e_inval;
655 /* we also don't have a separate freebind bit for IPV6 */
656 inet_sk(sk)->freebind = valbool;
657 retv = 0;
658 break;
659
660 case IPV6_RECVORIGDSTADDR:
661 if (optlen < sizeof(int))
662 goto e_inval;
663 np->rxopt.bits.rxorigdstaddr = valbool;
664 retv = 0;
665 break;
666
667 case IPV6_HOPOPTS:
668 case IPV6_RTHDRDSTOPTS:
669 case IPV6_RTHDR:
670 case IPV6_DSTOPTS:
671 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen);
672 break;
673
674 case IPV6_PKTINFO:
675 {
676 struct in6_pktinfo pkt;
677
678 if (optlen == 0)
679 goto e_inval;
680 else if (optlen < sizeof(struct in6_pktinfo) ||
681 sockptr_is_null(optval))
682 goto e_inval;
683
684 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) {
685 retv = -EFAULT;
686 break;
687 }
688 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
689 goto e_inval;
690
691 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
692 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
693 retv = 0;
694 break;
695 }
696
697 case IPV6_2292PKTOPTIONS:
698 {
699 struct ipv6_txoptions *opt = NULL;
700 struct msghdr msg;
701 struct flowi6 fl6;
702 struct ipcm6_cookie ipc6;
703
704 memset(&fl6, 0, sizeof(fl6));
705 fl6.flowi6_oif = sk->sk_bound_dev_if;
706 fl6.flowi6_mark = sk->sk_mark;
707
708 if (optlen == 0)
709 goto update;
710
711 /* 1K is probably excessive
712 * 1K is surely not enough, 2K per standard header is 16K.
713 */
714 retv = -EINVAL;
715 if (optlen > 64*1024)
716 break;
717
718 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
719 retv = -ENOBUFS;
720 if (!opt)
721 break;
722
723 memset(opt, 0, sizeof(*opt));
724 refcount_set(&opt->refcnt, 1);
725 opt->tot_len = sizeof(*opt) + optlen;
726 retv = -EFAULT;
727 if (copy_from_sockptr(opt + 1, optval, optlen))
728 goto done;
729
730 msg.msg_controllen = optlen;
731 msg.msg_control = (void *)(opt+1);
732 ipc6.opt = opt;
733
734 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
735 if (retv)
736 goto done;
737 update:
738 retv = 0;
739 opt = ipv6_update_options(sk, opt);
740 done:
741 if (opt) {
742 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
743 txopt_put(opt);
744 }
745 break;
746 }
747 case IPV6_UNICAST_HOPS:
748 if (optlen < sizeof(int))
749 goto e_inval;
750 if (val > 255 || val < -1)
751 goto e_inval;
752 np->hop_limit = val;
753 retv = 0;
754 break;
755
756 case IPV6_MULTICAST_HOPS:
757 if (sk->sk_type == SOCK_STREAM)
758 break;
759 if (optlen < sizeof(int))
760 goto e_inval;
761 if (val > 255 || val < -1)
762 goto e_inval;
763 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
764 retv = 0;
765 break;
766
767 case IPV6_MULTICAST_LOOP:
768 if (optlen < sizeof(int))
769 goto e_inval;
770 if (val != valbool)
771 goto e_inval;
772 np->mc_loop = valbool;
773 retv = 0;
774 break;
775
776 case IPV6_UNICAST_IF:
777 {
778 struct net_device *dev = NULL;
779 int ifindex;
780
781 if (optlen != sizeof(int))
782 goto e_inval;
783
784 ifindex = (__force int)ntohl((__force __be32)val);
785 if (ifindex == 0) {
786 np->ucast_oif = 0;
787 retv = 0;
788 break;
789 }
790
791 dev = dev_get_by_index(net, ifindex);
792 retv = -EADDRNOTAVAIL;
793 if (!dev)
794 break;
795 dev_put(dev);
796
797 retv = -EINVAL;
798 if (sk->sk_bound_dev_if)
799 break;
800
801 np->ucast_oif = ifindex;
802 retv = 0;
803 break;
804 }
805
806 case IPV6_MULTICAST_IF:
807 if (sk->sk_type == SOCK_STREAM)
808 break;
809 if (optlen < sizeof(int))
810 goto e_inval;
811
812 if (val) {
813 struct net_device *dev;
814 int midx;
815
816 rcu_read_lock();
817
818 dev = dev_get_by_index_rcu(net, val);
819 if (!dev) {
820 rcu_read_unlock();
821 retv = -ENODEV;
822 break;
823 }
824 midx = l3mdev_master_ifindex_rcu(dev);
825
826 rcu_read_unlock();
827
828 if (sk->sk_bound_dev_if &&
829 sk->sk_bound_dev_if != val &&
830 (!midx || midx != sk->sk_bound_dev_if))
831 goto e_inval;
832 }
833 np->mcast_oif = val;
834 retv = 0;
835 break;
836 case IPV6_ADD_MEMBERSHIP:
837 case IPV6_DROP_MEMBERSHIP:
838 {
839 struct ipv6_mreq mreq;
840
841 if (optlen < sizeof(struct ipv6_mreq))
842 goto e_inval;
843
844 retv = -EPROTO;
845 if (inet_sk(sk)->is_icsk)
846 break;
847
848 retv = -EFAULT;
849 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
850 break;
851
852 if (optname == IPV6_ADD_MEMBERSHIP)
853 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
854 else
855 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
856 break;
857 }
858 case IPV6_JOIN_ANYCAST:
859 case IPV6_LEAVE_ANYCAST:
860 {
861 struct ipv6_mreq mreq;
862
863 if (optlen < sizeof(struct ipv6_mreq))
864 goto e_inval;
865
866 retv = -EFAULT;
867 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
868 break;
869
870 if (optname == IPV6_JOIN_ANYCAST)
871 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
872 else
873 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
874 break;
875 }
876 case IPV6_MULTICAST_ALL:
877 if (optlen < sizeof(int))
878 goto e_inval;
879 np->mc_all = valbool;
880 retv = 0;
881 break;
882
883 case MCAST_JOIN_GROUP:
884 case MCAST_LEAVE_GROUP:
885 if (in_compat_syscall())
886 retv = compat_ipv6_mcast_join_leave(sk, optname, optval,
887 optlen);
888 else
889 retv = ipv6_mcast_join_leave(sk, optname, optval,
890 optlen);
891 break;
892 case MCAST_JOIN_SOURCE_GROUP:
893 case MCAST_LEAVE_SOURCE_GROUP:
894 case MCAST_BLOCK_SOURCE:
895 case MCAST_UNBLOCK_SOURCE:
896 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen);
897 break;
898 case MCAST_MSFILTER:
899 if (in_compat_syscall())
900 retv = compat_ipv6_set_mcast_msfilter(sk, optval,
901 optlen);
902 else
903 retv = ipv6_set_mcast_msfilter(sk, optval, optlen);
904 break;
905 case IPV6_ROUTER_ALERT:
906 if (optlen < sizeof(int))
907 goto e_inval;
908 retv = ip6_ra_control(sk, val);
909 break;
910 case IPV6_ROUTER_ALERT_ISOLATE:
911 if (optlen < sizeof(int))
912 goto e_inval;
913 np->rtalert_isolate = valbool;
914 retv = 0;
915 break;
916 case IPV6_MTU_DISCOVER:
917 if (optlen < sizeof(int))
918 goto e_inval;
919 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
920 goto e_inval;
921 np->pmtudisc = val;
922 retv = 0;
923 break;
924 case IPV6_MTU:
925 if (optlen < sizeof(int))
926 goto e_inval;
927 if (val && val < IPV6_MIN_MTU)
928 goto e_inval;
929 np->frag_size = val;
930 retv = 0;
931 break;
932 case IPV6_RECVERR:
933 if (optlen < sizeof(int))
934 goto e_inval;
935 np->recverr = valbool;
936 if (!val)
937 skb_queue_purge(&sk->sk_error_queue);
938 retv = 0;
939 break;
940 case IPV6_FLOWINFO_SEND:
941 if (optlen < sizeof(int))
942 goto e_inval;
943 np->sndflow = valbool;
944 retv = 0;
945 break;
946 case IPV6_FLOWLABEL_MGR:
947 retv = ipv6_flowlabel_opt(sk, optval, optlen);
948 break;
949 case IPV6_IPSEC_POLICY:
950 case IPV6_XFRM_POLICY:
951 retv = -EPERM;
952 if (!sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN))
953 break;
954 retv = xfrm_user_policy(sk, optname, optval, optlen);
955 break;
956
957 case IPV6_ADDR_PREFERENCES:
958 if (optlen < sizeof(int))
959 goto e_inval;
960 retv = __ip6_sock_set_addr_preferences(sk, val);
961 break;
962 case IPV6_MINHOPCOUNT:
963 if (optlen < sizeof(int))
964 goto e_inval;
965 if (val < 0 || val > 255)
966 goto e_inval;
967
968 if (val)
969 static_branch_enable(&ip6_min_hopcount);
970
971 /* tcp_v6_err() and tcp_v6_rcv() might read min_hopcount
972 * while we are changing it.
973 */
974 WRITE_ONCE(np->min_hopcount, val);
975 retv = 0;
976 break;
977 case IPV6_DONTFRAG:
978 np->dontfrag = valbool;
979 retv = 0;
980 break;
981 case IPV6_AUTOFLOWLABEL:
982 np->autoflowlabel = valbool;
983 np->autoflowlabel_set = 1;
984 retv = 0;
985 break;
986 case IPV6_RECVFRAGSIZE:
987 np->rxopt.bits.recvfragsize = valbool;
988 retv = 0;
989 break;
990 case IPV6_RECVERR_RFC4884:
991 if (optlen < sizeof(int))
992 goto e_inval;
993 if (val < 0 || val > 1)
994 goto e_inval;
995 np->recverr_rfc4884 = valbool;
996 retv = 0;
997 break;
998 }
999
1000 unlock:
1001 sockopt_release_sock(sk);
1002 if (needs_rtnl)
1003 rtnl_unlock();
1004
1005 return retv;
1006
1007 e_inval:
1008 sockopt_release_sock(sk);
1009 if (needs_rtnl)
1010 rtnl_unlock();
1011 return -EINVAL;
1012 }
1013
ipv6_setsockopt(struct sock * sk,int level,int optname,sockptr_t optval,unsigned int optlen)1014 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1015 unsigned int optlen)
1016 {
1017 int err;
1018
1019 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1020 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
1021
1022 if (level != SOL_IPV6)
1023 return -ENOPROTOOPT;
1024
1025 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
1026 #ifdef CONFIG_NETFILTER
1027 /* we need to exclude all possible ENOPROTOOPTs except default case */
1028 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
1029 optname != IPV6_XFRM_POLICY)
1030 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
1031 #endif
1032 return err;
1033 }
1034 EXPORT_SYMBOL(ipv6_setsockopt);
1035
ipv6_getsockopt_sticky(struct sock * sk,struct ipv6_txoptions * opt,int optname,sockptr_t optval,int len)1036 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
1037 int optname, sockptr_t optval, int len)
1038 {
1039 struct ipv6_opt_hdr *hdr;
1040
1041 if (!opt)
1042 return 0;
1043
1044 switch (optname) {
1045 case IPV6_HOPOPTS:
1046 hdr = opt->hopopt;
1047 break;
1048 case IPV6_RTHDRDSTOPTS:
1049 hdr = opt->dst0opt;
1050 break;
1051 case IPV6_RTHDR:
1052 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1053 break;
1054 case IPV6_DSTOPTS:
1055 hdr = opt->dst1opt;
1056 break;
1057 default:
1058 return -EINVAL; /* should not happen */
1059 }
1060
1061 if (!hdr)
1062 return 0;
1063
1064 len = min_t(unsigned int, len, ipv6_optlen(hdr));
1065 if (copy_to_sockptr(optval, hdr, len))
1066 return -EFAULT;
1067 return len;
1068 }
1069
ipv6_get_msfilter(struct sock * sk,sockptr_t optval,sockptr_t optlen,int len)1070 static int ipv6_get_msfilter(struct sock *sk, sockptr_t optval,
1071 sockptr_t optlen, int len)
1072 {
1073 const int size0 = offsetof(struct group_filter, gf_slist_flex);
1074 struct group_filter gsf;
1075 int num;
1076 int err;
1077
1078 if (len < size0)
1079 return -EINVAL;
1080 if (copy_from_sockptr(&gsf, optval, size0))
1081 return -EFAULT;
1082 if (gsf.gf_group.ss_family != AF_INET6)
1083 return -EADDRNOTAVAIL;
1084 num = gsf.gf_numsrc;
1085 sockopt_lock_sock(sk);
1086 err = ip6_mc_msfget(sk, &gsf, optval, size0);
1087 if (!err) {
1088 if (num > gsf.gf_numsrc)
1089 num = gsf.gf_numsrc;
1090 len = GROUP_FILTER_SIZE(num);
1091 if (copy_to_sockptr(optlen, &len, sizeof(int)) ||
1092 copy_to_sockptr(optval, &gsf, size0))
1093 err = -EFAULT;
1094 }
1095 sockopt_release_sock(sk);
1096 return err;
1097 }
1098
compat_ipv6_get_msfilter(struct sock * sk,sockptr_t optval,sockptr_t optlen,int len)1099 static int compat_ipv6_get_msfilter(struct sock *sk, sockptr_t optval,
1100 sockptr_t optlen, int len)
1101 {
1102 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
1103 struct compat_group_filter gf32;
1104 struct group_filter gf;
1105 int err;
1106 int num;
1107
1108 if (len < size0)
1109 return -EINVAL;
1110
1111 if (copy_from_sockptr(&gf32, optval, size0))
1112 return -EFAULT;
1113 gf.gf_interface = gf32.gf_interface;
1114 gf.gf_fmode = gf32.gf_fmode;
1115 num = gf.gf_numsrc = gf32.gf_numsrc;
1116 gf.gf_group = gf32.gf_group;
1117
1118 if (gf.gf_group.ss_family != AF_INET6)
1119 return -EADDRNOTAVAIL;
1120
1121 sockopt_lock_sock(sk);
1122 err = ip6_mc_msfget(sk, &gf, optval, size0);
1123 sockopt_release_sock(sk);
1124 if (err)
1125 return err;
1126 if (num > gf.gf_numsrc)
1127 num = gf.gf_numsrc;
1128 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32));
1129 if (copy_to_sockptr(optlen, &len, sizeof(int)) ||
1130 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_fmode),
1131 &gf.gf_fmode, sizeof(gf32.gf_fmode)) ||
1132 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_numsrc),
1133 &gf.gf_numsrc, sizeof(gf32.gf_numsrc)))
1134 return -EFAULT;
1135 return 0;
1136 }
1137
do_ipv6_getsockopt(struct sock * sk,int level,int optname,sockptr_t optval,sockptr_t optlen)1138 int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1139 sockptr_t optval, sockptr_t optlen)
1140 {
1141 struct ipv6_pinfo *np = inet6_sk(sk);
1142 int len;
1143 int val;
1144
1145 if (ip6_mroute_opt(optname))
1146 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1147
1148 if (copy_from_sockptr(&len, optlen, sizeof(int)))
1149 return -EFAULT;
1150 switch (optname) {
1151 case IPV6_ADDRFORM:
1152 if (sk->sk_protocol != IPPROTO_UDP &&
1153 sk->sk_protocol != IPPROTO_UDPLITE &&
1154 sk->sk_protocol != IPPROTO_TCP)
1155 return -ENOPROTOOPT;
1156 if (sk->sk_state != TCP_ESTABLISHED)
1157 return -ENOTCONN;
1158 val = sk->sk_family;
1159 break;
1160 case MCAST_MSFILTER:
1161 if (in_compat_syscall())
1162 return compat_ipv6_get_msfilter(sk, optval, optlen, len);
1163 return ipv6_get_msfilter(sk, optval, optlen, len);
1164 case IPV6_2292PKTOPTIONS:
1165 {
1166 struct msghdr msg;
1167 struct sk_buff *skb;
1168
1169 if (sk->sk_type != SOCK_STREAM)
1170 return -ENOPROTOOPT;
1171
1172 if (optval.is_kernel) {
1173 msg.msg_control_is_user = false;
1174 msg.msg_control = optval.kernel;
1175 } else {
1176 msg.msg_control_is_user = true;
1177 msg.msg_control_user = optval.user;
1178 }
1179 msg.msg_controllen = len;
1180 msg.msg_flags = 0;
1181
1182 sockopt_lock_sock(sk);
1183 skb = np->pktoptions;
1184 if (skb)
1185 ip6_datagram_recv_ctl(sk, &msg, skb);
1186 sockopt_release_sock(sk);
1187 if (!skb) {
1188 if (np->rxopt.bits.rxinfo) {
1189 struct in6_pktinfo src_info;
1190 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1191 np->sticky_pktinfo.ipi6_ifindex;
1192 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1193 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1194 }
1195 if (np->rxopt.bits.rxhlim) {
1196 int hlim = np->mcast_hops;
1197 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1198 }
1199 if (np->rxopt.bits.rxtclass) {
1200 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1201
1202 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1203 }
1204 if (np->rxopt.bits.rxoinfo) {
1205 struct in6_pktinfo src_info;
1206 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1207 np->sticky_pktinfo.ipi6_ifindex;
1208 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1209 np->sticky_pktinfo.ipi6_addr;
1210 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1211 }
1212 if (np->rxopt.bits.rxohlim) {
1213 int hlim = np->mcast_hops;
1214 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1215 }
1216 if (np->rxopt.bits.rxflow) {
1217 __be32 flowinfo = np->rcv_flowinfo;
1218
1219 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1220 }
1221 }
1222 len -= msg.msg_controllen;
1223 return copy_to_sockptr(optlen, &len, sizeof(int));
1224 }
1225 case IPV6_MTU:
1226 {
1227 struct dst_entry *dst;
1228
1229 val = 0;
1230 rcu_read_lock();
1231 dst = __sk_dst_get(sk);
1232 if (dst)
1233 val = dst_mtu(dst);
1234 rcu_read_unlock();
1235 if (!val)
1236 return -ENOTCONN;
1237 break;
1238 }
1239
1240 case IPV6_V6ONLY:
1241 val = sk->sk_ipv6only;
1242 break;
1243
1244 case IPV6_RECVPKTINFO:
1245 val = np->rxopt.bits.rxinfo;
1246 break;
1247
1248 case IPV6_2292PKTINFO:
1249 val = np->rxopt.bits.rxoinfo;
1250 break;
1251
1252 case IPV6_RECVHOPLIMIT:
1253 val = np->rxopt.bits.rxhlim;
1254 break;
1255
1256 case IPV6_2292HOPLIMIT:
1257 val = np->rxopt.bits.rxohlim;
1258 break;
1259
1260 case IPV6_RECVRTHDR:
1261 val = np->rxopt.bits.srcrt;
1262 break;
1263
1264 case IPV6_2292RTHDR:
1265 val = np->rxopt.bits.osrcrt;
1266 break;
1267
1268 case IPV6_HOPOPTS:
1269 case IPV6_RTHDRDSTOPTS:
1270 case IPV6_RTHDR:
1271 case IPV6_DSTOPTS:
1272 {
1273 struct ipv6_txoptions *opt;
1274
1275 sockopt_lock_sock(sk);
1276 opt = rcu_dereference_protected(np->opt,
1277 lockdep_sock_is_held(sk));
1278 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1279 sockopt_release_sock(sk);
1280 /* check if ipv6_getsockopt_sticky() returns err code */
1281 if (len < 0)
1282 return len;
1283 return copy_to_sockptr(optlen, &len, sizeof(int));
1284 }
1285
1286 case IPV6_RECVHOPOPTS:
1287 val = np->rxopt.bits.hopopts;
1288 break;
1289
1290 case IPV6_2292HOPOPTS:
1291 val = np->rxopt.bits.ohopopts;
1292 break;
1293
1294 case IPV6_RECVDSTOPTS:
1295 val = np->rxopt.bits.dstopts;
1296 break;
1297
1298 case IPV6_2292DSTOPTS:
1299 val = np->rxopt.bits.odstopts;
1300 break;
1301
1302 case IPV6_TCLASS:
1303 val = np->tclass;
1304 break;
1305
1306 case IPV6_RECVTCLASS:
1307 val = np->rxopt.bits.rxtclass;
1308 break;
1309
1310 case IPV6_FLOWINFO:
1311 val = np->rxopt.bits.rxflow;
1312 break;
1313
1314 case IPV6_RECVPATHMTU:
1315 val = np->rxopt.bits.rxpmtu;
1316 break;
1317
1318 case IPV6_PATHMTU:
1319 {
1320 struct dst_entry *dst;
1321 struct ip6_mtuinfo mtuinfo;
1322
1323 if (len < sizeof(mtuinfo))
1324 return -EINVAL;
1325
1326 len = sizeof(mtuinfo);
1327 memset(&mtuinfo, 0, sizeof(mtuinfo));
1328
1329 rcu_read_lock();
1330 dst = __sk_dst_get(sk);
1331 if (dst)
1332 mtuinfo.ip6m_mtu = dst_mtu(dst);
1333 rcu_read_unlock();
1334 if (!mtuinfo.ip6m_mtu)
1335 return -ENOTCONN;
1336
1337 if (copy_to_sockptr(optlen, &len, sizeof(int)))
1338 return -EFAULT;
1339 if (copy_to_sockptr(optval, &mtuinfo, len))
1340 return -EFAULT;
1341
1342 return 0;
1343 }
1344
1345 case IPV6_TRANSPARENT:
1346 val = inet_sk(sk)->transparent;
1347 break;
1348
1349 case IPV6_FREEBIND:
1350 val = inet_sk(sk)->freebind;
1351 break;
1352
1353 case IPV6_RECVORIGDSTADDR:
1354 val = np->rxopt.bits.rxorigdstaddr;
1355 break;
1356
1357 case IPV6_UNICAST_HOPS:
1358 case IPV6_MULTICAST_HOPS:
1359 {
1360 struct dst_entry *dst;
1361
1362 if (optname == IPV6_UNICAST_HOPS)
1363 val = np->hop_limit;
1364 else
1365 val = np->mcast_hops;
1366
1367 if (val < 0) {
1368 rcu_read_lock();
1369 dst = __sk_dst_get(sk);
1370 if (dst)
1371 val = ip6_dst_hoplimit(dst);
1372 rcu_read_unlock();
1373 }
1374
1375 if (val < 0)
1376 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1377 break;
1378 }
1379
1380 case IPV6_MULTICAST_LOOP:
1381 val = np->mc_loop;
1382 break;
1383
1384 case IPV6_MULTICAST_IF:
1385 val = np->mcast_oif;
1386 break;
1387
1388 case IPV6_MULTICAST_ALL:
1389 val = np->mc_all;
1390 break;
1391
1392 case IPV6_UNICAST_IF:
1393 val = (__force int)htonl((__u32) np->ucast_oif);
1394 break;
1395
1396 case IPV6_MTU_DISCOVER:
1397 val = np->pmtudisc;
1398 break;
1399
1400 case IPV6_RECVERR:
1401 val = np->recverr;
1402 break;
1403
1404 case IPV6_FLOWINFO_SEND:
1405 val = np->sndflow;
1406 break;
1407
1408 case IPV6_FLOWLABEL_MGR:
1409 {
1410 struct in6_flowlabel_req freq;
1411 int flags;
1412
1413 if (len < sizeof(freq))
1414 return -EINVAL;
1415
1416 if (copy_from_sockptr(&freq, optval, sizeof(freq)))
1417 return -EFAULT;
1418
1419 if (freq.flr_action != IPV6_FL_A_GET)
1420 return -EINVAL;
1421
1422 len = sizeof(freq);
1423 flags = freq.flr_flags;
1424
1425 memset(&freq, 0, sizeof(freq));
1426
1427 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1428 if (val < 0)
1429 return val;
1430
1431 if (copy_to_sockptr(optlen, &len, sizeof(int)))
1432 return -EFAULT;
1433 if (copy_to_sockptr(optval, &freq, len))
1434 return -EFAULT;
1435
1436 return 0;
1437 }
1438
1439 case IPV6_ADDR_PREFERENCES:
1440 val = 0;
1441
1442 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1443 val |= IPV6_PREFER_SRC_TMP;
1444 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1445 val |= IPV6_PREFER_SRC_PUBLIC;
1446 else {
1447 /* XXX: should we return system default? */
1448 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1449 }
1450
1451 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1452 val |= IPV6_PREFER_SRC_COA;
1453 else
1454 val |= IPV6_PREFER_SRC_HOME;
1455 break;
1456
1457 case IPV6_MINHOPCOUNT:
1458 val = np->min_hopcount;
1459 break;
1460
1461 case IPV6_DONTFRAG:
1462 val = np->dontfrag;
1463 break;
1464
1465 case IPV6_AUTOFLOWLABEL:
1466 val = ip6_autoflowlabel(sock_net(sk), np);
1467 break;
1468
1469 case IPV6_RECVFRAGSIZE:
1470 val = np->rxopt.bits.recvfragsize;
1471 break;
1472
1473 case IPV6_ROUTER_ALERT_ISOLATE:
1474 val = np->rtalert_isolate;
1475 break;
1476
1477 case IPV6_RECVERR_RFC4884:
1478 val = np->recverr_rfc4884;
1479 break;
1480
1481 default:
1482 return -ENOPROTOOPT;
1483 }
1484 len = min_t(unsigned int, sizeof(int), len);
1485 if (copy_to_sockptr(optlen, &len, sizeof(int)))
1486 return -EFAULT;
1487 if (copy_to_sockptr(optval, &val, len))
1488 return -EFAULT;
1489 return 0;
1490 }
1491
ipv6_getsockopt(struct sock * sk,int level,int optname,char __user * optval,int __user * optlen)1492 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1493 char __user *optval, int __user *optlen)
1494 {
1495 int err;
1496
1497 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1498 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1499
1500 if (level != SOL_IPV6)
1501 return -ENOPROTOOPT;
1502
1503 err = do_ipv6_getsockopt(sk, level, optname,
1504 USER_SOCKPTR(optval), USER_SOCKPTR(optlen));
1505 #ifdef CONFIG_NETFILTER
1506 /* we need to exclude all possible ENOPROTOOPTs except default case */
1507 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1508 int len;
1509
1510 if (get_user(len, optlen))
1511 return -EFAULT;
1512
1513 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1514 if (err >= 0)
1515 err = put_user(len, optlen);
1516 }
1517 #endif
1518 return err;
1519 }
1520 EXPORT_SYMBOL(ipv6_getsockopt);
1521
