tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * IPv6 BSD socket options interface
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 *
9 * Based on linux/net/ipv4/ip_sockglue.c
10 *
11 * FIXME: Make the setsockopt code POSIX compliant: That is
12 *
13 * o Truncate getsockopt returns
14 * o Return an optlen of the truncated length if need be
15 *
16 * Changes:
17 * David L Stevens <dlstevens@us.ibm.com>:
18 * - added multicast source filtering API for MLDv2
19 */
20
21#include <linux/module.h>
22#include <linux/capability.h>
23#include <linux/errno.h>
24#include <linux/types.h>
25#include <linux/socket.h>
26#include <linux/sockios.h>
27#include <linux/net.h>
28#include <linux/in6.h>
29#include <linux/mroute6.h>
30#include <linux/netdevice.h>
31#include <linux/if_arp.h>
32#include <linux/init.h>
33#include <linux/sysctl.h>
34#include <linux/netfilter.h>
35#include <linux/slab.h>
36
37#include <net/sock.h>
38#include <net/snmp.h>
39#include <net/ipv6.h>
40#include <net/ndisc.h>
41#include <net/protocol.h>
42#include <net/transp_v6.h>
43#include <net/ip6_route.h>
44#include <net/addrconf.h>
45#include <net/inet_common.h>
46#include <net/tcp.h>
47#include <net/udp.h>
48#include <net/udplite.h>
49#include <net/xfrm.h>
50#include <net/compat.h>
51#include <net/seg6.h>
52
53#include <linux/uaccess.h>
54
55struct ip6_ra_chain *ip6_ra_chain;
56DEFINE_RWLOCK(ip6_ra_lock);
57
58DEFINE_STATIC_KEY_FALSE(ip6_min_hopcount);
59
60int ip6_ra_control(struct sock *sk, int sel)
61{
62 struct ip6_ra_chain *ra, *new_ra, **rap;
63
64 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
65 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
66 return -ENOPROTOOPT;
67
68 new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
69 if (sel >= 0 && !new_ra)
70 return -ENOMEM;
71
72 write_lock_bh(&ip6_ra_lock);
73 for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
74 if (ra->sk == sk) {
75 if (sel >= 0) {
76 write_unlock_bh(&ip6_ra_lock);
77 kfree(new_ra);
78 return -EADDRINUSE;
79 }
80
81 *rap = ra->next;
82 write_unlock_bh(&ip6_ra_lock);
83
84 sock_put(sk);
85 kfree(ra);
86 return 0;
87 }
88 }
89 if (!new_ra) {
90 write_unlock_bh(&ip6_ra_lock);
91 return -ENOBUFS;
92 }
93 new_ra->sk = sk;
94 new_ra->sel = sel;
95 new_ra->next = ra;
96 *rap = new_ra;
97 sock_hold(sk);
98 write_unlock_bh(&ip6_ra_lock);
99 return 0;
100}
101
102struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
103 struct ipv6_txoptions *opt)
104{
105 if (inet_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
121static bool setsockopt_needs_rtnl(int optname)
122{
123 switch (optname) {
124 case IPV6_ADDRFORM:
125 case IPV6_ADD_MEMBERSHIP:
126 case IPV6_DROP_MEMBERSHIP:
127 case IPV6_JOIN_ANYCAST:
128 case IPV6_LEAVE_ANYCAST:
129 case MCAST_JOIN_GROUP:
130 case MCAST_LEAVE_GROUP:
131 case MCAST_JOIN_SOURCE_GROUP:
132 case MCAST_LEAVE_SOURCE_GROUP:
133 case MCAST_BLOCK_SOURCE:
134 case MCAST_UNBLOCK_SOURCE:
135 case MCAST_MSFILTER:
136 return true;
137 }
138 return false;
139}
140
141static int copy_group_source_from_sockptr(struct group_source_req *greqs,
142 sockptr_t optval, int optlen)
143{
144 if (in_compat_syscall()) {
145 struct compat_group_source_req gr32;
146
147 if (optlen < sizeof(gr32))
148 return -EINVAL;
149 if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
150 return -EFAULT;
151 greqs->gsr_interface = gr32.gsr_interface;
152 greqs->gsr_group = gr32.gsr_group;
153 greqs->gsr_source = gr32.gsr_source;
154 } else {
155 if (optlen < sizeof(*greqs))
156 return -EINVAL;
157 if (copy_from_sockptr(greqs, optval, sizeof(*greqs)))
158 return -EFAULT;
159 }
160
161 return 0;
162}
163
164static int do_ipv6_mcast_group_source(struct sock *sk, int optname,
165 sockptr_t optval, int optlen)
166{
167 struct group_source_req greqs;
168 int omode, add;
169 int ret;
170
171 ret = copy_group_source_from_sockptr(&greqs, optval, optlen);
172 if (ret)
173 return ret;
174
175 if (greqs.gsr_group.ss_family != AF_INET6 ||
176 greqs.gsr_source.ss_family != AF_INET6)
177 return -EADDRNOTAVAIL;
178
179 if (optname == MCAST_BLOCK_SOURCE) {
180 omode = MCAST_EXCLUDE;
181 add = 1;
182 } else if (optname == MCAST_UNBLOCK_SOURCE) {
183 omode = MCAST_EXCLUDE;
184 add = 0;
185 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
186 struct sockaddr_in6 *psin6;
187 int retv;
188
189 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
190 retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
191 &psin6->sin6_addr,
192 MCAST_INCLUDE);
193 /* prior join w/ different source is ok */
194 if (retv && retv != -EADDRINUSE)
195 return retv;
196 omode = MCAST_INCLUDE;
197 add = 1;
198 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
199 omode = MCAST_INCLUDE;
200 add = 0;
201 }
202 return ip6_mc_source(add, omode, sk, &greqs);
203}
204
205static int ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
206 int optlen)
207{
208 struct group_filter *gsf;
209 int ret;
210
211 if (optlen < GROUP_FILTER_SIZE(0))
212 return -EINVAL;
213 if (optlen > READ_ONCE(sysctl_optmem_max))
214 return -ENOBUFS;
215
216 gsf = memdup_sockptr(optval, optlen);
217 if (IS_ERR(gsf))
218 return PTR_ERR(gsf);
219
220 /* numsrc >= (4G-140)/128 overflow in 32 bits */
221 ret = -ENOBUFS;
222 if (gsf->gf_numsrc >= 0x1ffffffU ||
223 gsf->gf_numsrc > sysctl_mld_max_msf)
224 goto out_free_gsf;
225
226 ret = -EINVAL;
227 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen)
228 goto out_free_gsf;
229
230 ret = ip6_mc_msfilter(sk, gsf, gsf->gf_slist_flex);
231out_free_gsf:
232 kfree(gsf);
233 return ret;
234}
235
236static int compat_ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
237 int optlen)
238{
239 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
240 struct compat_group_filter *gf32;
241 void *p;
242 int ret;
243 int n;
244
245 if (optlen < size0)
246 return -EINVAL;
247 if (optlen > READ_ONCE(sysctl_optmem_max) - 4)
248 return -ENOBUFS;
249
250 p = kmalloc(optlen + 4, GFP_KERNEL);
251 if (!p)
252 return -ENOMEM;
253
254 gf32 = p + 4; /* we want ->gf_group and ->gf_slist_flex aligned */
255 ret = -EFAULT;
256 if (copy_from_sockptr(gf32, optval, optlen))
257 goto out_free_p;
258
259 /* numsrc >= (4G-140)/128 overflow in 32 bits */
260 ret = -ENOBUFS;
261 n = gf32->gf_numsrc;
262 if (n >= 0x1ffffffU || n > sysctl_mld_max_msf)
263 goto out_free_p;
264
265 ret = -EINVAL;
266 if (offsetof(struct compat_group_filter, gf_slist_flex[n]) > optlen)
267 goto out_free_p;
268
269 ret = ip6_mc_msfilter(sk, &(struct group_filter){
270 .gf_interface = gf32->gf_interface,
271 .gf_group = gf32->gf_group,
272 .gf_fmode = gf32->gf_fmode,
273 .gf_numsrc = gf32->gf_numsrc}, gf32->gf_slist_flex);
274
275out_free_p:
276 kfree(p);
277 return ret;
278}
279
280static int ipv6_mcast_join_leave(struct sock *sk, int optname,
281 sockptr_t optval, int optlen)
282{
283 struct sockaddr_in6 *psin6;
284 struct group_req greq;
285
286 if (optlen < sizeof(greq))
287 return -EINVAL;
288 if (copy_from_sockptr(&greq, optval, sizeof(greq)))
289 return -EFAULT;
290
291 if (greq.gr_group.ss_family != AF_INET6)
292 return -EADDRNOTAVAIL;
293 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
294 if (optname == MCAST_JOIN_GROUP)
295 return ipv6_sock_mc_join(sk, greq.gr_interface,
296 &psin6->sin6_addr);
297 return ipv6_sock_mc_drop(sk, greq.gr_interface, &psin6->sin6_addr);
298}
299
300static int compat_ipv6_mcast_join_leave(struct sock *sk, int optname,
301 sockptr_t optval, int optlen)
302{
303 struct compat_group_req gr32;
304 struct sockaddr_in6 *psin6;
305
306 if (optlen < sizeof(gr32))
307 return -EINVAL;
308 if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
309 return -EFAULT;
310
311 if (gr32.gr_group.ss_family != AF_INET6)
312 return -EADDRNOTAVAIL;
313 psin6 = (struct sockaddr_in6 *)&gr32.gr_group;
314 if (optname == MCAST_JOIN_GROUP)
315 return ipv6_sock_mc_join(sk, gr32.gr_interface,
316 &psin6->sin6_addr);
317 return ipv6_sock_mc_drop(sk, gr32.gr_interface, &psin6->sin6_addr);
318}
319
320static int ipv6_set_opt_hdr(struct sock *sk, int optname, sockptr_t optval,
321 int optlen)
322{
323 struct ipv6_pinfo *np = inet6_sk(sk);
324 struct ipv6_opt_hdr *new = NULL;
325 struct net *net = sock_net(sk);
326 struct ipv6_txoptions *opt;
327 int err;
328
329 /* hop-by-hop / destination options are privileged option */
330 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
331 return -EPERM;
332
333 /* remove any sticky options header with a zero option
334 * length, per RFC3542.
335 */
336 if (optlen > 0) {
337 if (sockptr_is_null(optval))
338 return -EINVAL;
339 if (optlen < sizeof(struct ipv6_opt_hdr) ||
340 optlen & 0x7 ||
341 optlen > 8 * 255)
342 return -EINVAL;
343
344 new = memdup_sockptr(optval, optlen);
345 if (IS_ERR(new))
346 return PTR_ERR(new);
347 if (unlikely(ipv6_optlen(new) > optlen)) {
348 kfree(new);
349 return -EINVAL;
350 }
351 }
352
353 opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk));
354 opt = ipv6_renew_options(sk, opt, optname, new);
355 kfree(new);
356 if (IS_ERR(opt))
357 return PTR_ERR(opt);
358
359 /* routing header option needs extra check */
360 err = -EINVAL;
361 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
362 struct ipv6_rt_hdr *rthdr = opt->srcrt;
363 switch (rthdr->type) {
364#if IS_ENABLED(CONFIG_IPV6_MIP6)
365 case IPV6_SRCRT_TYPE_2:
366 if (rthdr->hdrlen != 2 || rthdr->segments_left != 1)
367 goto sticky_done;
368 break;
369#endif
370 case IPV6_SRCRT_TYPE_4:
371 {
372 struct ipv6_sr_hdr *srh =
373 (struct ipv6_sr_hdr *)opt->srcrt;
374
375 if (!seg6_validate_srh(srh, optlen, false))
376 goto sticky_done;
377 break;
378 }
379 default:
380 goto sticky_done;
381 }
382 }
383
384 err = 0;
385 opt = ipv6_update_options(sk, opt);
386sticky_done:
387 if (opt) {
388 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
389 txopt_put(opt);
390 }
391 return err;
392}
393
394static 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 lock_sock(sk);
421
422 switch (optname) {
423
424 case IPV6_ADDRFORM:
425 if (optlen < sizeof(int))
426 goto e_inval;
427 if (val == PF_INET) {
428 struct ipv6_txoptions *opt;
429 struct sk_buff *pktopt;
430
431 if (sk->sk_type == SOCK_RAW)
432 break;
433
434 if (sk->sk_protocol == IPPROTO_UDP ||
435 sk->sk_protocol == IPPROTO_UDPLITE) {
436 struct udp_sock *up = udp_sk(sk);
437 if (up->pending == AF_INET6) {
438 retv = -EBUSY;
439 break;
440 }
441 } else if (sk->sk_protocol == IPPROTO_TCP) {
442 if (sk->sk_prot != &tcpv6_prot) {
443 retv = -EBUSY;
444 break;
445 }
446 } else {
447 break;
448 }
449
450 if (sk->sk_state != TCP_ESTABLISHED) {
451 retv = -ENOTCONN;
452 break;
453 }
454
455 if (ipv6_only_sock(sk) ||
456 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
457 retv = -EADDRNOTAVAIL;
458 break;
459 }
460
461 fl6_free_socklist(sk);
462 __ipv6_sock_mc_close(sk);
463 __ipv6_sock_ac_close(sk);
464
465 /*
466 * Sock is moving from IPv6 to IPv4 (sk_prot), so
467 * remove it from the refcnt debug socks count in the
468 * original family...
469 */
470 sk_refcnt_debug_dec(sk);
471
472 if (sk->sk_protocol == IPPROTO_TCP) {
473 struct inet_connection_sock *icsk = inet_csk(sk);
474
475 sock_prot_inuse_add(net, sk->sk_prot, -1);
476 sock_prot_inuse_add(net, &tcp_prot, 1);
477
478 /* Paired with READ_ONCE(sk->sk_prot) in net/ipv6/af_inet6.c */
479 WRITE_ONCE(sk->sk_prot, &tcp_prot);
480 icsk->icsk_af_ops = &ipv4_specific;
481 sk->sk_socket->ops = &inet_stream_ops;
482 sk->sk_family = PF_INET;
483 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
484 } else {
485 struct proto *prot = &udp_prot;
486
487 if (sk->sk_protocol == IPPROTO_UDPLITE)
488 prot = &udplite_prot;
489
490 sock_prot_inuse_add(net, sk->sk_prot, -1);
491 sock_prot_inuse_add(net, prot, 1);
492
493 /* Paired with READ_ONCE(sk->sk_prot) in net/ipv6/af_inet6.c */
494 WRITE_ONCE(sk->sk_prot, prot);
495 sk->sk_socket->ops = &inet_dgram_ops;
496 sk->sk_family = PF_INET;
497 }
498 opt = xchg((__force struct ipv6_txoptions **)&np->opt,
499 NULL);
500 if (opt) {
501 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
502 txopt_put(opt);
503 }
504 pktopt = xchg(&np->pktoptions, NULL);
505 kfree_skb(pktopt);
506
507 /*
508 * ... and add it to the refcnt debug socks count
509 * in the new family. -acme
510 */
511 sk_refcnt_debug_inc(sk);
512 module_put(THIS_MODULE);
513 retv = 0;
514 break;
515 }
516 goto e_inval;
517
518 case IPV6_V6ONLY:
519 if (optlen < sizeof(int) ||
520 inet_sk(sk)->inet_num)
521 goto e_inval;
522 sk->sk_ipv6only = valbool;
523 retv = 0;
524 break;
525
526 case IPV6_RECVPKTINFO:
527 if (optlen < sizeof(int))
528 goto e_inval;
529 np->rxopt.bits.rxinfo = valbool;
530 retv = 0;
531 break;
532
533 case IPV6_2292PKTINFO:
534 if (optlen < sizeof(int))
535 goto e_inval;
536 np->rxopt.bits.rxoinfo = valbool;
537 retv = 0;
538 break;
539
540 case IPV6_RECVHOPLIMIT:
541 if (optlen < sizeof(int))
542 goto e_inval;
543 np->rxopt.bits.rxhlim = valbool;
544 retv = 0;
545 break;
546
547 case IPV6_2292HOPLIMIT:
548 if (optlen < sizeof(int))
549 goto e_inval;
550 np->rxopt.bits.rxohlim = valbool;
551 retv = 0;
552 break;
553
554 case IPV6_RECVRTHDR:
555 if (optlen < sizeof(int))
556 goto e_inval;
557 np->rxopt.bits.srcrt = valbool;
558 retv = 0;
559 break;
560
561 case IPV6_2292RTHDR:
562 if (optlen < sizeof(int))
563 goto e_inval;
564 np->rxopt.bits.osrcrt = valbool;
565 retv = 0;
566 break;
567
568 case IPV6_RECVHOPOPTS:
569 if (optlen < sizeof(int))
570 goto e_inval;
571 np->rxopt.bits.hopopts = valbool;
572 retv = 0;
573 break;
574
575 case IPV6_2292HOPOPTS:
576 if (optlen < sizeof(int))
577 goto e_inval;
578 np->rxopt.bits.ohopopts = valbool;
579 retv = 0;
580 break;
581
582 case IPV6_RECVDSTOPTS:
583 if (optlen < sizeof(int))
584 goto e_inval;
585 np->rxopt.bits.dstopts = valbool;
586 retv = 0;
587 break;
588
589 case IPV6_2292DSTOPTS:
590 if (optlen < sizeof(int))
591 goto e_inval;
592 np->rxopt.bits.odstopts = valbool;
593 retv = 0;
594 break;
595
596 case IPV6_TCLASS:
597 if (optlen < sizeof(int))
598 goto e_inval;
599 if (val < -1 || val > 0xff)
600 goto e_inval;
601 /* RFC 3542, 6.5: default traffic class of 0x0 */
602 if (val == -1)
603 val = 0;
604 if (sk->sk_type == SOCK_STREAM) {
605 val &= ~INET_ECN_MASK;
606 val |= np->tclass & INET_ECN_MASK;
607 }
608 if (np->tclass != val) {
609 np->tclass = val;
610 sk_dst_reset(sk);
611 }
612 retv = 0;
613 break;
614
615 case IPV6_RECVTCLASS:
616 if (optlen < sizeof(int))
617 goto e_inval;
618 np->rxopt.bits.rxtclass = valbool;
619 retv = 0;
620 break;
621
622 case IPV6_FLOWINFO:
623 if (optlen < sizeof(int))
624 goto e_inval;
625 np->rxopt.bits.rxflow = valbool;
626 retv = 0;
627 break;
628
629 case IPV6_RECVPATHMTU:
630 if (optlen < sizeof(int))
631 goto e_inval;
632 np->rxopt.bits.rxpmtu = valbool;
633 retv = 0;
634 break;
635
636 case IPV6_TRANSPARENT:
637 if (valbool && !ns_capable(net->user_ns, CAP_NET_RAW) &&
638 !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
639 retv = -EPERM;
640 break;
641 }
642 if (optlen < sizeof(int))
643 goto e_inval;
644 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
645 inet_sk(sk)->transparent = valbool;
646 retv = 0;
647 break;
648
649 case IPV6_FREEBIND:
650 if (optlen < sizeof(int))
651 goto e_inval;
652 /* we also don't have a separate freebind bit for IPV6 */
653 inet_sk(sk)->freebind = valbool;
654 retv = 0;
655 break;
656
657 case IPV6_RECVORIGDSTADDR:
658 if (optlen < sizeof(int))
659 goto e_inval;
660 np->rxopt.bits.rxorigdstaddr = valbool;
661 retv = 0;
662 break;
663
664 case IPV6_HOPOPTS:
665 case IPV6_RTHDRDSTOPTS:
666 case IPV6_RTHDR:
667 case IPV6_DSTOPTS:
668 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen);
669 break;
670
671 case IPV6_PKTINFO:
672 {
673 struct in6_pktinfo pkt;
674
675 if (optlen == 0)
676 goto e_inval;
677 else if (optlen < sizeof(struct in6_pktinfo) ||
678 sockptr_is_null(optval))
679 goto e_inval;
680
681 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) {
682 retv = -EFAULT;
683 break;
684 }
685 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
686 goto e_inval;
687
688 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
689 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
690 retv = 0;
691 break;
692 }
693
694 case IPV6_2292PKTOPTIONS:
695 {
696 struct ipv6_txoptions *opt = NULL;
697 struct msghdr msg;
698 struct flowi6 fl6;
699 struct ipcm6_cookie ipc6;
700
701 memset(&fl6, 0, sizeof(fl6));
702 fl6.flowi6_oif = sk->sk_bound_dev_if;
703 fl6.flowi6_mark = sk->sk_mark;
704
705 if (optlen == 0)
706 goto update;
707
708 /* 1K is probably excessive
709 * 1K is surely not enough, 2K per standard header is 16K.
710 */
711 retv = -EINVAL;
712 if (optlen > 64*1024)
713 break;
714
715 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
716 retv = -ENOBUFS;
717 if (!opt)
718 break;
719
720 memset(opt, 0, sizeof(*opt));
721 refcount_set(&opt->refcnt, 1);
722 opt->tot_len = sizeof(*opt) + optlen;
723 retv = -EFAULT;
724 if (copy_from_sockptr(opt + 1, optval, optlen))
725 goto done;
726
727 msg.msg_controllen = optlen;
728 msg.msg_control = (void *)(opt+1);
729 ipc6.opt = opt;
730
731 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
732 if (retv)
733 goto done;
734update:
735 retv = 0;
736 opt = ipv6_update_options(sk, opt);
737done:
738 if (opt) {
739 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
740 txopt_put(opt);
741 }
742 break;
743 }
744 case IPV6_UNICAST_HOPS:
745 if (optlen < sizeof(int))
746 goto e_inval;
747 if (val > 255 || val < -1)
748 goto e_inval;
749 np->hop_limit = val;
750 retv = 0;
751 break;
752
753 case IPV6_MULTICAST_HOPS:
754 if (sk->sk_type == SOCK_STREAM)
755 break;
756 if (optlen < sizeof(int))
757 goto e_inval;
758 if (val > 255 || val < -1)
759 goto e_inval;
760 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
761 retv = 0;
762 break;
763
764 case IPV6_MULTICAST_LOOP:
765 if (optlen < sizeof(int))
766 goto e_inval;
767 if (val != valbool)
768 goto e_inval;
769 np->mc_loop = valbool;
770 retv = 0;
771 break;
772
773 case IPV6_UNICAST_IF:
774 {
775 struct net_device *dev = NULL;
776 int ifindex;
777
778 if (optlen != sizeof(int))
779 goto e_inval;
780
781 ifindex = (__force int)ntohl((__force __be32)val);
782 if (ifindex == 0) {
783 np->ucast_oif = 0;
784 retv = 0;
785 break;
786 }
787
788 dev = dev_get_by_index(net, ifindex);
789 retv = -EADDRNOTAVAIL;
790 if (!dev)
791 break;
792 dev_put(dev);
793
794 retv = -EINVAL;
795 if (sk->sk_bound_dev_if)
796 break;
797
798 np->ucast_oif = ifindex;
799 retv = 0;
800 break;
801 }
802
803 case IPV6_MULTICAST_IF:
804 if (sk->sk_type == SOCK_STREAM)
805 break;
806 if (optlen < sizeof(int))
807 goto e_inval;
808
809 if (val) {
810 struct net_device *dev;
811 int midx;
812
813 rcu_read_lock();
814
815 dev = dev_get_by_index_rcu(net, val);
816 if (!dev) {
817 rcu_read_unlock();
818 retv = -ENODEV;
819 break;
820 }
821 midx = l3mdev_master_ifindex_rcu(dev);
822
823 rcu_read_unlock();
824
825 if (sk->sk_bound_dev_if &&
826 sk->sk_bound_dev_if != val &&
827 (!midx || midx != sk->sk_bound_dev_if))
828 goto e_inval;
829 }
830 np->mcast_oif = val;
831 retv = 0;
832 break;
833 case IPV6_ADD_MEMBERSHIP:
834 case IPV6_DROP_MEMBERSHIP:
835 {
836 struct ipv6_mreq mreq;
837
838 if (optlen < sizeof(struct ipv6_mreq))
839 goto e_inval;
840
841 retv = -EPROTO;
842 if (inet_sk(sk)->is_icsk)
843 break;
844
845 retv = -EFAULT;
846 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
847 break;
848
849 if (optname == IPV6_ADD_MEMBERSHIP)
850 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
851 else
852 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
853 break;
854 }
855 case IPV6_JOIN_ANYCAST:
856 case IPV6_LEAVE_ANYCAST:
857 {
858 struct ipv6_mreq mreq;
859
860 if (optlen < sizeof(struct ipv6_mreq))
861 goto e_inval;
862
863 retv = -EFAULT;
864 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
865 break;
866
867 if (optname == IPV6_JOIN_ANYCAST)
868 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
869 else
870 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
871 break;
872 }
873 case IPV6_MULTICAST_ALL:
874 if (optlen < sizeof(int))
875 goto e_inval;
876 np->mc_all = valbool;
877 retv = 0;
878 break;
879
880 case MCAST_JOIN_GROUP:
881 case MCAST_LEAVE_GROUP:
882 if (in_compat_syscall())
883 retv = compat_ipv6_mcast_join_leave(sk, optname, optval,
884 optlen);
885 else
886 retv = ipv6_mcast_join_leave(sk, optname, optval,
887 optlen);
888 break;
889 case MCAST_JOIN_SOURCE_GROUP:
890 case MCAST_LEAVE_SOURCE_GROUP:
891 case MCAST_BLOCK_SOURCE:
892 case MCAST_UNBLOCK_SOURCE:
893 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen);
894 break;
895 case MCAST_MSFILTER:
896 if (in_compat_syscall())
897 retv = compat_ipv6_set_mcast_msfilter(sk, optval,
898 optlen);
899 else
900 retv = ipv6_set_mcast_msfilter(sk, optval, optlen);
901 break;
902 case IPV6_ROUTER_ALERT:
903 if (optlen < sizeof(int))
904 goto e_inval;
905 retv = ip6_ra_control(sk, val);
906 break;
907 case IPV6_ROUTER_ALERT_ISOLATE:
908 if (optlen < sizeof(int))
909 goto e_inval;
910 np->rtalert_isolate = valbool;
911 retv = 0;
912 break;
913 case IPV6_MTU_DISCOVER:
914 if (optlen < sizeof(int))
915 goto e_inval;
916 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
917 goto e_inval;
918 np->pmtudisc = val;
919 retv = 0;
920 break;
921 case IPV6_MTU:
922 if (optlen < sizeof(int))
923 goto e_inval;
924 if (val && val < IPV6_MIN_MTU)
925 goto e_inval;
926 np->frag_size = val;
927 retv = 0;
928 break;
929 case IPV6_RECVERR:
930 if (optlen < sizeof(int))
931 goto e_inval;
932 np->recverr = valbool;
933 if (!val)
934 skb_queue_purge(&sk->sk_error_queue);
935 retv = 0;
936 break;
937 case IPV6_FLOWINFO_SEND:
938 if (optlen < sizeof(int))
939 goto e_inval;
940 np->sndflow = valbool;
941 retv = 0;
942 break;
943 case IPV6_FLOWLABEL_MGR:
944 retv = ipv6_flowlabel_opt(sk, optval, optlen);
945 break;
946 case IPV6_IPSEC_POLICY:
947 case IPV6_XFRM_POLICY:
948 retv = -EPERM;
949 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
950 break;
951 retv = xfrm_user_policy(sk, optname, optval, optlen);
952 break;
953
954 case IPV6_ADDR_PREFERENCES:
955 if (optlen < sizeof(int))
956 goto e_inval;
957 retv = __ip6_sock_set_addr_preferences(sk, val);
958 break;
959 case IPV6_MINHOPCOUNT:
960 if (optlen < sizeof(int))
961 goto e_inval;
962 if (val < 0 || val > 255)
963 goto e_inval;
964
965 if (val)
966 static_branch_enable(&ip6_min_hopcount);
967
968 /* tcp_v6_err() and tcp_v6_rcv() might read min_hopcount
969 * while we are changing it.
970 */
971 WRITE_ONCE(np->min_hopcount, val);
972 retv = 0;
973 break;
974 case IPV6_DONTFRAG:
975 np->dontfrag = valbool;
976 retv = 0;
977 break;
978 case IPV6_AUTOFLOWLABEL:
979 np->autoflowlabel = valbool;
980 np->autoflowlabel_set = 1;
981 retv = 0;
982 break;
983 case IPV6_RECVFRAGSIZE:
984 np->rxopt.bits.recvfragsize = valbool;
985 retv = 0;
986 break;
987 case IPV6_RECVERR_RFC4884:
988 if (optlen < sizeof(int))
989 goto e_inval;
990 if (val < 0 || val > 1)
991 goto e_inval;
992 np->recverr_rfc4884 = valbool;
993 retv = 0;
994 break;
995 }
996
997 release_sock(sk);
998 if (needs_rtnl)
999 rtnl_unlock();
1000
1001 return retv;
1002
1003e_inval:
1004 release_sock(sk);
1005 if (needs_rtnl)
1006 rtnl_unlock();
1007 return -EINVAL;
1008}
1009
1010int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1011 unsigned int optlen)
1012{
1013 int err;
1014
1015 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1016 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
1017
1018 if (level != SOL_IPV6)
1019 return -ENOPROTOOPT;
1020
1021 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
1022#ifdef CONFIG_NETFILTER
1023 /* we need to exclude all possible ENOPROTOOPTs except default case */
1024 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
1025 optname != IPV6_XFRM_POLICY)
1026 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
1027#endif
1028 return err;
1029}
1030EXPORT_SYMBOL(ipv6_setsockopt);
1031
1032static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
1033 int optname, char __user *optval, int len)
1034{
1035 struct ipv6_opt_hdr *hdr;
1036
1037 if (!opt)
1038 return 0;
1039
1040 switch (optname) {
1041 case IPV6_HOPOPTS:
1042 hdr = opt->hopopt;
1043 break;
1044 case IPV6_RTHDRDSTOPTS:
1045 hdr = opt->dst0opt;
1046 break;
1047 case IPV6_RTHDR:
1048 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1049 break;
1050 case IPV6_DSTOPTS:
1051 hdr = opt->dst1opt;
1052 break;
1053 default:
1054 return -EINVAL; /* should not happen */
1055 }
1056
1057 if (!hdr)
1058 return 0;
1059
1060 len = min_t(unsigned int, len, ipv6_optlen(hdr));
1061 if (copy_to_user(optval, hdr, len))
1062 return -EFAULT;
1063 return len;
1064}
1065
1066static int ipv6_get_msfilter(struct sock *sk, void __user *optval,
1067 int __user *optlen, int len)
1068{
1069 const int size0 = offsetof(struct group_filter, gf_slist_flex);
1070 struct group_filter __user *p = optval;
1071 struct group_filter gsf;
1072 int num;
1073 int err;
1074
1075 if (len < size0)
1076 return -EINVAL;
1077 if (copy_from_user(&gsf, p, size0))
1078 return -EFAULT;
1079 if (gsf.gf_group.ss_family != AF_INET6)
1080 return -EADDRNOTAVAIL;
1081 num = gsf.gf_numsrc;
1082 lock_sock(sk);
1083 err = ip6_mc_msfget(sk, &gsf, p->gf_slist_flex);
1084 if (!err) {
1085 if (num > gsf.gf_numsrc)
1086 num = gsf.gf_numsrc;
1087 if (put_user(GROUP_FILTER_SIZE(num), optlen) ||
1088 copy_to_user(p, &gsf, size0))
1089 err = -EFAULT;
1090 }
1091 release_sock(sk);
1092 return err;
1093}
1094
1095static int compat_ipv6_get_msfilter(struct sock *sk, void __user *optval,
1096 int __user *optlen)
1097{
1098 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
1099 struct compat_group_filter __user *p = optval;
1100 struct compat_group_filter gf32;
1101 struct group_filter gf;
1102 int len, err;
1103 int num;
1104
1105 if (get_user(len, optlen))
1106 return -EFAULT;
1107 if (len < size0)
1108 return -EINVAL;
1109
1110 if (copy_from_user(&gf32, p, size0))
1111 return -EFAULT;
1112 gf.gf_interface = gf32.gf_interface;
1113 gf.gf_fmode = gf32.gf_fmode;
1114 num = gf.gf_numsrc = gf32.gf_numsrc;
1115 gf.gf_group = gf32.gf_group;
1116
1117 if (gf.gf_group.ss_family != AF_INET6)
1118 return -EADDRNOTAVAIL;
1119
1120 lock_sock(sk);
1121 err = ip6_mc_msfget(sk, &gf, p->gf_slist_flex);
1122 release_sock(sk);
1123 if (err)
1124 return err;
1125 if (num > gf.gf_numsrc)
1126 num = gf.gf_numsrc;
1127 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32));
1128 if (put_user(len, optlen) ||
1129 put_user(gf.gf_fmode, &p->gf_fmode) ||
1130 put_user(gf.gf_numsrc, &p->gf_numsrc))
1131 return -EFAULT;
1132 return 0;
1133}
1134
1135static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1136 char __user *optval, int __user *optlen, unsigned int flags)
1137{
1138 struct ipv6_pinfo *np = inet6_sk(sk);
1139 int len;
1140 int val;
1141
1142 if (ip6_mroute_opt(optname))
1143 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1144
1145 if (get_user(len, optlen))
1146 return -EFAULT;
1147 switch (optname) {
1148 case IPV6_ADDRFORM:
1149 if (sk->sk_protocol != IPPROTO_UDP &&
1150 sk->sk_protocol != IPPROTO_UDPLITE &&
1151 sk->sk_protocol != IPPROTO_TCP)
1152 return -ENOPROTOOPT;
1153 if (sk->sk_state != TCP_ESTABLISHED)
1154 return -ENOTCONN;
1155 val = sk->sk_family;
1156 break;
1157 case MCAST_MSFILTER:
1158 if (in_compat_syscall())
1159 return compat_ipv6_get_msfilter(sk, optval, optlen);
1160 return ipv6_get_msfilter(sk, optval, optlen, len);
1161 case IPV6_2292PKTOPTIONS:
1162 {
1163 struct msghdr msg;
1164 struct sk_buff *skb;
1165
1166 if (sk->sk_type != SOCK_STREAM)
1167 return -ENOPROTOOPT;
1168
1169 msg.msg_control_user = optval;
1170 msg.msg_controllen = len;
1171 msg.msg_flags = flags;
1172 msg.msg_control_is_user = true;
1173
1174 lock_sock(sk);
1175 skb = np->pktoptions;
1176 if (skb)
1177 ip6_datagram_recv_ctl(sk, &msg, skb);
1178 release_sock(sk);
1179 if (!skb) {
1180 if (np->rxopt.bits.rxinfo) {
1181 struct in6_pktinfo src_info;
1182 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1183 np->sticky_pktinfo.ipi6_ifindex;
1184 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1185 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1186 }
1187 if (np->rxopt.bits.rxhlim) {
1188 int hlim = np->mcast_hops;
1189 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1190 }
1191 if (np->rxopt.bits.rxtclass) {
1192 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1193
1194 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1195 }
1196 if (np->rxopt.bits.rxoinfo) {
1197 struct in6_pktinfo src_info;
1198 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1199 np->sticky_pktinfo.ipi6_ifindex;
1200 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1201 np->sticky_pktinfo.ipi6_addr;
1202 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1203 }
1204 if (np->rxopt.bits.rxohlim) {
1205 int hlim = np->mcast_hops;
1206 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1207 }
1208 if (np->rxopt.bits.rxflow) {
1209 __be32 flowinfo = np->rcv_flowinfo;
1210
1211 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1212 }
1213 }
1214 len -= msg.msg_controllen;
1215 return put_user(len, optlen);
1216 }
1217 case IPV6_MTU:
1218 {
1219 struct dst_entry *dst;
1220
1221 val = 0;
1222 rcu_read_lock();
1223 dst = __sk_dst_get(sk);
1224 if (dst)
1225 val = dst_mtu(dst);
1226 rcu_read_unlock();
1227 if (!val)
1228 return -ENOTCONN;
1229 break;
1230 }
1231
1232 case IPV6_V6ONLY:
1233 val = sk->sk_ipv6only;
1234 break;
1235
1236 case IPV6_RECVPKTINFO:
1237 val = np->rxopt.bits.rxinfo;
1238 break;
1239
1240 case IPV6_2292PKTINFO:
1241 val = np->rxopt.bits.rxoinfo;
1242 break;
1243
1244 case IPV6_RECVHOPLIMIT:
1245 val = np->rxopt.bits.rxhlim;
1246 break;
1247
1248 case IPV6_2292HOPLIMIT:
1249 val = np->rxopt.bits.rxohlim;
1250 break;
1251
1252 case IPV6_RECVRTHDR:
1253 val = np->rxopt.bits.srcrt;
1254 break;
1255
1256 case IPV6_2292RTHDR:
1257 val = np->rxopt.bits.osrcrt;
1258 break;
1259
1260 case IPV6_HOPOPTS:
1261 case IPV6_RTHDRDSTOPTS:
1262 case IPV6_RTHDR:
1263 case IPV6_DSTOPTS:
1264 {
1265 struct ipv6_txoptions *opt;
1266
1267 lock_sock(sk);
1268 opt = rcu_dereference_protected(np->opt,
1269 lockdep_sock_is_held(sk));
1270 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1271 release_sock(sk);
1272 /* check if ipv6_getsockopt_sticky() returns err code */
1273 if (len < 0)
1274 return len;
1275 return put_user(len, optlen);
1276 }
1277
1278 case IPV6_RECVHOPOPTS:
1279 val = np->rxopt.bits.hopopts;
1280 break;
1281
1282 case IPV6_2292HOPOPTS:
1283 val = np->rxopt.bits.ohopopts;
1284 break;
1285
1286 case IPV6_RECVDSTOPTS:
1287 val = np->rxopt.bits.dstopts;
1288 break;
1289
1290 case IPV6_2292DSTOPTS:
1291 val = np->rxopt.bits.odstopts;
1292 break;
1293
1294 case IPV6_TCLASS:
1295 val = np->tclass;
1296 break;
1297
1298 case IPV6_RECVTCLASS:
1299 val = np->rxopt.bits.rxtclass;
1300 break;
1301
1302 case IPV6_FLOWINFO:
1303 val = np->rxopt.bits.rxflow;
1304 break;
1305
1306 case IPV6_RECVPATHMTU:
1307 val = np->rxopt.bits.rxpmtu;
1308 break;
1309
1310 case IPV6_PATHMTU:
1311 {
1312 struct dst_entry *dst;
1313 struct ip6_mtuinfo mtuinfo;
1314
1315 if (len < sizeof(mtuinfo))
1316 return -EINVAL;
1317
1318 len = sizeof(mtuinfo);
1319 memset(&mtuinfo, 0, sizeof(mtuinfo));
1320
1321 rcu_read_lock();
1322 dst = __sk_dst_get(sk);
1323 if (dst)
1324 mtuinfo.ip6m_mtu = dst_mtu(dst);
1325 rcu_read_unlock();
1326 if (!mtuinfo.ip6m_mtu)
1327 return -ENOTCONN;
1328
1329 if (put_user(len, optlen))
1330 return -EFAULT;
1331 if (copy_to_user(optval, &mtuinfo, len))
1332 return -EFAULT;
1333
1334 return 0;
1335 }
1336
1337 case IPV6_TRANSPARENT:
1338 val = inet_sk(sk)->transparent;
1339 break;
1340
1341 case IPV6_FREEBIND:
1342 val = inet_sk(sk)->freebind;
1343 break;
1344
1345 case IPV6_RECVORIGDSTADDR:
1346 val = np->rxopt.bits.rxorigdstaddr;
1347 break;
1348
1349 case IPV6_UNICAST_HOPS:
1350 case IPV6_MULTICAST_HOPS:
1351 {
1352 struct dst_entry *dst;
1353
1354 if (optname == IPV6_UNICAST_HOPS)
1355 val = np->hop_limit;
1356 else
1357 val = np->mcast_hops;
1358
1359 if (val < 0) {
1360 rcu_read_lock();
1361 dst = __sk_dst_get(sk);
1362 if (dst)
1363 val = ip6_dst_hoplimit(dst);
1364 rcu_read_unlock();
1365 }
1366
1367 if (val < 0)
1368 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1369 break;
1370 }
1371
1372 case IPV6_MULTICAST_LOOP:
1373 val = np->mc_loop;
1374 break;
1375
1376 case IPV6_MULTICAST_IF:
1377 val = np->mcast_oif;
1378 break;
1379
1380 case IPV6_MULTICAST_ALL:
1381 val = np->mc_all;
1382 break;
1383
1384 case IPV6_UNICAST_IF:
1385 val = (__force int)htonl((__u32) np->ucast_oif);
1386 break;
1387
1388 case IPV6_MTU_DISCOVER:
1389 val = np->pmtudisc;
1390 break;
1391
1392 case IPV6_RECVERR:
1393 val = np->recverr;
1394 break;
1395
1396 case IPV6_FLOWINFO_SEND:
1397 val = np->sndflow;
1398 break;
1399
1400 case IPV6_FLOWLABEL_MGR:
1401 {
1402 struct in6_flowlabel_req freq;
1403 int flags;
1404
1405 if (len < sizeof(freq))
1406 return -EINVAL;
1407
1408 if (copy_from_user(&freq, optval, sizeof(freq)))
1409 return -EFAULT;
1410
1411 if (freq.flr_action != IPV6_FL_A_GET)
1412 return -EINVAL;
1413
1414 len = sizeof(freq);
1415 flags = freq.flr_flags;
1416
1417 memset(&freq, 0, sizeof(freq));
1418
1419 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1420 if (val < 0)
1421 return val;
1422
1423 if (put_user(len, optlen))
1424 return -EFAULT;
1425 if (copy_to_user(optval, &freq, len))
1426 return -EFAULT;
1427
1428 return 0;
1429 }
1430
1431 case IPV6_ADDR_PREFERENCES:
1432 val = 0;
1433
1434 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1435 val |= IPV6_PREFER_SRC_TMP;
1436 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1437 val |= IPV6_PREFER_SRC_PUBLIC;
1438 else {
1439 /* XXX: should we return system default? */
1440 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1441 }
1442
1443 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1444 val |= IPV6_PREFER_SRC_COA;
1445 else
1446 val |= IPV6_PREFER_SRC_HOME;
1447 break;
1448
1449 case IPV6_MINHOPCOUNT:
1450 val = np->min_hopcount;
1451 break;
1452
1453 case IPV6_DONTFRAG:
1454 val = np->dontfrag;
1455 break;
1456
1457 case IPV6_AUTOFLOWLABEL:
1458 val = ip6_autoflowlabel(sock_net(sk), np);
1459 break;
1460
1461 case IPV6_RECVFRAGSIZE:
1462 val = np->rxopt.bits.recvfragsize;
1463 break;
1464
1465 case IPV6_ROUTER_ALERT_ISOLATE:
1466 val = np->rtalert_isolate;
1467 break;
1468
1469 case IPV6_RECVERR_RFC4884:
1470 val = np->recverr_rfc4884;
1471 break;
1472
1473 default:
1474 return -ENOPROTOOPT;
1475 }
1476 len = min_t(unsigned int, sizeof(int), len);
1477 if (put_user(len, optlen))
1478 return -EFAULT;
1479 if (copy_to_user(optval, &val, len))
1480 return -EFAULT;
1481 return 0;
1482}
1483
1484int ipv6_getsockopt(struct sock *sk, int level, int optname,
1485 char __user *optval, int __user *optlen)
1486{
1487 int err;
1488
1489 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1490 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1491
1492 if (level != SOL_IPV6)
1493 return -ENOPROTOOPT;
1494
1495 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1496#ifdef CONFIG_NETFILTER
1497 /* we need to exclude all possible ENOPROTOOPTs except default case */
1498 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1499 int len;
1500
1501 if (get_user(len, optlen))
1502 return -EFAULT;
1503
1504 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1505 if (err >= 0)
1506 err = put_user(len, optlen);
1507 }
1508#endif
1509 return err;
1510}
1511EXPORT_SYMBOL(ipv6_getsockopt);