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[mirror_ubuntu-jammy-kernel.git] / net / ipv6 / ipv6_sockglue.c
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 int ip6_ra_control(struct sock *sk, int sel)
59 {
60 struct ip6_ra_chain *ra, *new_ra, **rap;
61
62 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
63 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
64 return -ENOPROTOOPT;
65
66 new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
67 if (sel >= 0 && !new_ra)
68 return -ENOMEM;
69
70 write_lock_bh(&ip6_ra_lock);
71 for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
72 if (ra->sk == sk) {
73 if (sel >= 0) {
74 write_unlock_bh(&ip6_ra_lock);
75 kfree(new_ra);
76 return -EADDRINUSE;
77 }
78
79 *rap = ra->next;
80 write_unlock_bh(&ip6_ra_lock);
81
82 sock_put(sk);
83 kfree(ra);
84 return 0;
85 }
86 }
87 if (!new_ra) {
88 write_unlock_bh(&ip6_ra_lock);
89 return -ENOBUFS;
90 }
91 new_ra->sk = sk;
92 new_ra->sel = sel;
93 new_ra->next = ra;
94 *rap = new_ra;
95 sock_hold(sk);
96 write_unlock_bh(&ip6_ra_lock);
97 return 0;
98 }
99
100 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
101 struct ipv6_txoptions *opt)
102 {
103 if (inet_sk(sk)->is_icsk) {
104 if (opt &&
105 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
106 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
107 struct inet_connection_sock *icsk = inet_csk(sk);
108 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
109 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
110 }
111 }
112 opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
113 opt);
114 sk_dst_reset(sk);
115
116 return opt;
117 }
118
119 static bool setsockopt_needs_rtnl(int optname)
120 {
121 switch (optname) {
122 case IPV6_ADDRFORM:
123 case IPV6_ADD_MEMBERSHIP:
124 case IPV6_DROP_MEMBERSHIP:
125 case IPV6_JOIN_ANYCAST:
126 case IPV6_LEAVE_ANYCAST:
127 case MCAST_JOIN_GROUP:
128 case MCAST_LEAVE_GROUP:
129 case MCAST_JOIN_SOURCE_GROUP:
130 case MCAST_LEAVE_SOURCE_GROUP:
131 case MCAST_BLOCK_SOURCE:
132 case MCAST_UNBLOCK_SOURCE:
133 case MCAST_MSFILTER:
134 return true;
135 }
136 return false;
137 }
138
139 static int copy_group_source_from_sockptr(struct group_source_req *greqs,
140 sockptr_t optval, int optlen)
141 {
142 if (in_compat_syscall()) {
143 struct compat_group_source_req gr32;
144
145 if (optlen < sizeof(gr32))
146 return -EINVAL;
147 if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
148 return -EFAULT;
149 greqs->gsr_interface = gr32.gsr_interface;
150 greqs->gsr_group = gr32.gsr_group;
151 greqs->gsr_source = gr32.gsr_source;
152 } else {
153 if (optlen < sizeof(*greqs))
154 return -EINVAL;
155 if (copy_from_sockptr(greqs, optval, sizeof(*greqs)))
156 return -EFAULT;
157 }
158
159 return 0;
160 }
161
162 static int do_ipv6_mcast_group_source(struct sock *sk, int optname,
163 sockptr_t optval, int optlen)
164 {
165 struct group_source_req greqs;
166 int omode, add;
167 int ret;
168
169 ret = copy_group_source_from_sockptr(&greqs, optval, optlen);
170 if (ret)
171 return ret;
172
173 if (greqs.gsr_group.ss_family != AF_INET6 ||
174 greqs.gsr_source.ss_family != AF_INET6)
175 return -EADDRNOTAVAIL;
176
177 if (optname == MCAST_BLOCK_SOURCE) {
178 omode = MCAST_EXCLUDE;
179 add = 1;
180 } else if (optname == MCAST_UNBLOCK_SOURCE) {
181 omode = MCAST_EXCLUDE;
182 add = 0;
183 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
184 struct sockaddr_in6 *psin6;
185 int retv;
186
187 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
188 retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
189 &psin6->sin6_addr,
190 MCAST_INCLUDE);
191 /* prior join w/ different source is ok */
192 if (retv && retv != -EADDRINUSE)
193 return retv;
194 omode = MCAST_INCLUDE;
195 add = 1;
196 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
197 omode = MCAST_INCLUDE;
198 add = 0;
199 }
200 return ip6_mc_source(add, omode, sk, &greqs);
201 }
202
203 static int ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
204 int optlen)
205 {
206 struct group_filter *gsf;
207 int ret;
208
209 if (optlen < GROUP_FILTER_SIZE(0))
210 return -EINVAL;
211 if (optlen > sysctl_optmem_max)
212 return -ENOBUFS;
213
214 gsf = memdup_sockptr(optval, optlen);
215 if (IS_ERR(gsf))
216 return PTR_ERR(gsf);
217
218 /* numsrc >= (4G-140)/128 overflow in 32 bits */
219 ret = -ENOBUFS;
220 if (gsf->gf_numsrc >= 0x1ffffffU ||
221 gsf->gf_numsrc > sysctl_mld_max_msf)
222 goto out_free_gsf;
223
224 ret = -EINVAL;
225 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen)
226 goto out_free_gsf;
227
228 ret = ip6_mc_msfilter(sk, gsf, gsf->gf_slist_flex);
229 out_free_gsf:
230 kfree(gsf);
231 return ret;
232 }
233
234 static int compat_ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
235 int optlen)
236 {
237 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
238 struct compat_group_filter *gf32;
239 void *p;
240 int ret;
241 int n;
242
243 if (optlen < size0)
244 return -EINVAL;
245 if (optlen > sysctl_optmem_max - 4)
246 return -ENOBUFS;
247
248 p = kmalloc(optlen + 4, GFP_KERNEL);
249 if (!p)
250 return -ENOMEM;
251
252 gf32 = p + 4; /* we want ->gf_group and ->gf_slist_flex aligned */
253 ret = -EFAULT;
254 if (copy_from_sockptr(gf32, optval, optlen))
255 goto out_free_p;
256
257 /* numsrc >= (4G-140)/128 overflow in 32 bits */
258 ret = -ENOBUFS;
259 n = gf32->gf_numsrc;
260 if (n >= 0x1ffffffU || n > sysctl_mld_max_msf)
261 goto out_free_p;
262
263 ret = -EINVAL;
264 if (offsetof(struct compat_group_filter, gf_slist_flex[n]) > optlen)
265 goto out_free_p;
266
267 ret = ip6_mc_msfilter(sk, &(struct group_filter){
268 .gf_interface = gf32->gf_interface,
269 .gf_group = gf32->gf_group,
270 .gf_fmode = gf32->gf_fmode,
271 .gf_numsrc = gf32->gf_numsrc}, gf32->gf_slist_flex);
272
273 out_free_p:
274 kfree(p);
275 return ret;
276 }
277
278 static int ipv6_mcast_join_leave(struct sock *sk, int optname,
279 sockptr_t optval, int optlen)
280 {
281 struct sockaddr_in6 *psin6;
282 struct group_req greq;
283
284 if (optlen < sizeof(greq))
285 return -EINVAL;
286 if (copy_from_sockptr(&greq, optval, sizeof(greq)))
287 return -EFAULT;
288
289 if (greq.gr_group.ss_family != AF_INET6)
290 return -EADDRNOTAVAIL;
291 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
292 if (optname == MCAST_JOIN_GROUP)
293 return ipv6_sock_mc_join(sk, greq.gr_interface,
294 &psin6->sin6_addr);
295 return ipv6_sock_mc_drop(sk, greq.gr_interface, &psin6->sin6_addr);
296 }
297
298 static int compat_ipv6_mcast_join_leave(struct sock *sk, int optname,
299 sockptr_t optval, int optlen)
300 {
301 struct compat_group_req gr32;
302 struct sockaddr_in6 *psin6;
303
304 if (optlen < sizeof(gr32))
305 return -EINVAL;
306 if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
307 return -EFAULT;
308
309 if (gr32.gr_group.ss_family != AF_INET6)
310 return -EADDRNOTAVAIL;
311 psin6 = (struct sockaddr_in6 *)&gr32.gr_group;
312 if (optname == MCAST_JOIN_GROUP)
313 return ipv6_sock_mc_join(sk, gr32.gr_interface,
314 &psin6->sin6_addr);
315 return ipv6_sock_mc_drop(sk, gr32.gr_interface, &psin6->sin6_addr);
316 }
317
318 static int ipv6_set_opt_hdr(struct sock *sk, int optname, sockptr_t optval,
319 int optlen)
320 {
321 struct ipv6_pinfo *np = inet6_sk(sk);
322 struct ipv6_opt_hdr *new = NULL;
323 struct net *net = sock_net(sk);
324 struct ipv6_txoptions *opt;
325 int err;
326
327 /* hop-by-hop / destination options are privileged option */
328 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
329 return -EPERM;
330
331 /* remove any sticky options header with a zero option
332 * length, per RFC3542.
333 */
334 if (optlen > 0) {
335 if (sockptr_is_null(optval))
336 return -EINVAL;
337 if (optlen < sizeof(struct ipv6_opt_hdr) ||
338 optlen & 0x7 ||
339 optlen > 8 * 255)
340 return -EINVAL;
341
342 new = memdup_sockptr(optval, optlen);
343 if (IS_ERR(new))
344 return PTR_ERR(new);
345 if (unlikely(ipv6_optlen(new) > optlen)) {
346 kfree(new);
347 return -EINVAL;
348 }
349 }
350
351 opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk));
352 opt = ipv6_renew_options(sk, opt, optname, new);
353 kfree(new);
354 if (IS_ERR(opt))
355 return PTR_ERR(opt);
356
357 /* routing header option needs extra check */
358 err = -EINVAL;
359 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
360 struct ipv6_rt_hdr *rthdr = opt->srcrt;
361 switch (rthdr->type) {
362 #if IS_ENABLED(CONFIG_IPV6_MIP6)
363 case IPV6_SRCRT_TYPE_2:
364 if (rthdr->hdrlen != 2 || rthdr->segments_left != 1)
365 goto sticky_done;
366 break;
367 #endif
368 case IPV6_SRCRT_TYPE_4:
369 {
370 struct ipv6_sr_hdr *srh =
371 (struct ipv6_sr_hdr *)opt->srcrt;
372
373 if (!seg6_validate_srh(srh, optlen, false))
374 goto sticky_done;
375 break;
376 }
377 default:
378 goto sticky_done;
379 }
380 }
381
382 err = 0;
383 opt = ipv6_update_options(sk, opt);
384 sticky_done:
385 if (opt) {
386 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
387 txopt_put(opt);
388 }
389 return err;
390 }
391
392 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
393 sockptr_t optval, unsigned int optlen)
394 {
395 struct ipv6_pinfo *np = inet6_sk(sk);
396 struct net *net = sock_net(sk);
397 int val, valbool;
398 int retv = -ENOPROTOOPT;
399 bool needs_rtnl = setsockopt_needs_rtnl(optname);
400
401 if (sockptr_is_null(optval))
402 val = 0;
403 else {
404 if (optlen >= sizeof(int)) {
405 if (copy_from_sockptr(&val, optval, sizeof(val)))
406 return -EFAULT;
407 } else
408 val = 0;
409 }
410
411 valbool = (val != 0);
412
413 if (ip6_mroute_opt(optname))
414 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
415
416 if (needs_rtnl)
417 rtnl_lock();
418 lock_sock(sk);
419
420 switch (optname) {
421
422 case IPV6_ADDRFORM:
423 if (optlen < sizeof(int))
424 goto e_inval;
425 if (val == PF_INET) {
426 struct ipv6_txoptions *opt;
427 struct sk_buff *pktopt;
428
429 if (sk->sk_type == SOCK_RAW)
430 break;
431
432 if (sk->sk_protocol == IPPROTO_UDP ||
433 sk->sk_protocol == IPPROTO_UDPLITE) {
434 struct udp_sock *up = udp_sk(sk);
435 if (up->pending == AF_INET6) {
436 retv = -EBUSY;
437 break;
438 }
439 } else if (sk->sk_protocol == IPPROTO_TCP) {
440 if (sk->sk_prot != &tcpv6_prot) {
441 retv = -EBUSY;
442 break;
443 }
444 } else {
445 break;
446 }
447
448 if (sk->sk_state != TCP_ESTABLISHED) {
449 retv = -ENOTCONN;
450 break;
451 }
452
453 if (ipv6_only_sock(sk) ||
454 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
455 retv = -EADDRNOTAVAIL;
456 break;
457 }
458
459 fl6_free_socklist(sk);
460 __ipv6_sock_mc_close(sk);
461 __ipv6_sock_ac_close(sk);
462
463 /*
464 * Sock is moving from IPv6 to IPv4 (sk_prot), so
465 * remove it from the refcnt debug socks count in the
466 * original family...
467 */
468 sk_refcnt_debug_dec(sk);
469
470 if (sk->sk_protocol == IPPROTO_TCP) {
471 struct inet_connection_sock *icsk = inet_csk(sk);
472 local_bh_disable();
473 sock_prot_inuse_add(net, sk->sk_prot, -1);
474 sock_prot_inuse_add(net, &tcp_prot, 1);
475 local_bh_enable();
476 sk->sk_prot = &tcp_prot;
477 icsk->icsk_af_ops = &ipv4_specific;
478 sk->sk_socket->ops = &inet_stream_ops;
479 sk->sk_family = PF_INET;
480 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
481 } else {
482 struct proto *prot = &udp_prot;
483
484 if (sk->sk_protocol == IPPROTO_UDPLITE)
485 prot = &udplite_prot;
486 local_bh_disable();
487 sock_prot_inuse_add(net, sk->sk_prot, -1);
488 sock_prot_inuse_add(net, prot, 1);
489 local_bh_enable();
490 sk->sk_prot = prot;
491 sk->sk_socket->ops = &inet_dgram_ops;
492 sk->sk_family = PF_INET;
493 }
494 opt = xchg((__force struct ipv6_txoptions **)&np->opt,
495 NULL);
496 if (opt) {
497 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
498 txopt_put(opt);
499 }
500 pktopt = xchg(&np->pktoptions, NULL);
501 kfree_skb(pktopt);
502
503 /*
504 * ... and add it to the refcnt debug socks count
505 * in the new family. -acme
506 */
507 sk_refcnt_debug_inc(sk);
508 module_put(THIS_MODULE);
509 retv = 0;
510 break;
511 }
512 goto e_inval;
513
514 case IPV6_V6ONLY:
515 if (optlen < sizeof(int) ||
516 inet_sk(sk)->inet_num)
517 goto e_inval;
518 sk->sk_ipv6only = valbool;
519 retv = 0;
520 break;
521
522 case IPV6_RECVPKTINFO:
523 if (optlen < sizeof(int))
524 goto e_inval;
525 np->rxopt.bits.rxinfo = valbool;
526 retv = 0;
527 break;
528
529 case IPV6_2292PKTINFO:
530 if (optlen < sizeof(int))
531 goto e_inval;
532 np->rxopt.bits.rxoinfo = valbool;
533 retv = 0;
534 break;
535
536 case IPV6_RECVHOPLIMIT:
537 if (optlen < sizeof(int))
538 goto e_inval;
539 np->rxopt.bits.rxhlim = valbool;
540 retv = 0;
541 break;
542
543 case IPV6_2292HOPLIMIT:
544 if (optlen < sizeof(int))
545 goto e_inval;
546 np->rxopt.bits.rxohlim = valbool;
547 retv = 0;
548 break;
549
550 case IPV6_RECVRTHDR:
551 if (optlen < sizeof(int))
552 goto e_inval;
553 np->rxopt.bits.srcrt = valbool;
554 retv = 0;
555 break;
556
557 case IPV6_2292RTHDR:
558 if (optlen < sizeof(int))
559 goto e_inval;
560 np->rxopt.bits.osrcrt = valbool;
561 retv = 0;
562 break;
563
564 case IPV6_RECVHOPOPTS:
565 if (optlen < sizeof(int))
566 goto e_inval;
567 np->rxopt.bits.hopopts = valbool;
568 retv = 0;
569 break;
570
571 case IPV6_2292HOPOPTS:
572 if (optlen < sizeof(int))
573 goto e_inval;
574 np->rxopt.bits.ohopopts = valbool;
575 retv = 0;
576 break;
577
578 case IPV6_RECVDSTOPTS:
579 if (optlen < sizeof(int))
580 goto e_inval;
581 np->rxopt.bits.dstopts = valbool;
582 retv = 0;
583 break;
584
585 case IPV6_2292DSTOPTS:
586 if (optlen < sizeof(int))
587 goto e_inval;
588 np->rxopt.bits.odstopts = valbool;
589 retv = 0;
590 break;
591
592 case IPV6_TCLASS:
593 if (optlen < sizeof(int))
594 goto e_inval;
595 if (val < -1 || val > 0xff)
596 goto e_inval;
597 /* RFC 3542, 6.5: default traffic class of 0x0 */
598 if (val == -1)
599 val = 0;
600 np->tclass = val;
601 retv = 0;
602 break;
603
604 case IPV6_RECVTCLASS:
605 if (optlen < sizeof(int))
606 goto e_inval;
607 np->rxopt.bits.rxtclass = valbool;
608 retv = 0;
609 break;
610
611 case IPV6_FLOWINFO:
612 if (optlen < sizeof(int))
613 goto e_inval;
614 np->rxopt.bits.rxflow = valbool;
615 retv = 0;
616 break;
617
618 case IPV6_RECVPATHMTU:
619 if (optlen < sizeof(int))
620 goto e_inval;
621 np->rxopt.bits.rxpmtu = valbool;
622 retv = 0;
623 break;
624
625 case IPV6_TRANSPARENT:
626 if (valbool && !ns_capable(net->user_ns, CAP_NET_RAW) &&
627 !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
628 retv = -EPERM;
629 break;
630 }
631 if (optlen < sizeof(int))
632 goto e_inval;
633 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
634 inet_sk(sk)->transparent = valbool;
635 retv = 0;
636 break;
637
638 case IPV6_FREEBIND:
639 if (optlen < sizeof(int))
640 goto e_inval;
641 /* we also don't have a separate freebind bit for IPV6 */
642 inet_sk(sk)->freebind = valbool;
643 retv = 0;
644 break;
645
646 case IPV6_RECVORIGDSTADDR:
647 if (optlen < sizeof(int))
648 goto e_inval;
649 np->rxopt.bits.rxorigdstaddr = valbool;
650 retv = 0;
651 break;
652
653 case IPV6_HOPOPTS:
654 case IPV6_RTHDRDSTOPTS:
655 case IPV6_RTHDR:
656 case IPV6_DSTOPTS:
657 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen);
658 break;
659
660 case IPV6_PKTINFO:
661 {
662 struct in6_pktinfo pkt;
663
664 if (optlen == 0)
665 goto e_inval;
666 else if (optlen < sizeof(struct in6_pktinfo) ||
667 sockptr_is_null(optval))
668 goto e_inval;
669
670 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) {
671 retv = -EFAULT;
672 break;
673 }
674 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
675 goto e_inval;
676
677 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
678 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
679 retv = 0;
680 break;
681 }
682
683 case IPV6_2292PKTOPTIONS:
684 {
685 struct ipv6_txoptions *opt = NULL;
686 struct msghdr msg;
687 struct flowi6 fl6;
688 struct ipcm6_cookie ipc6;
689
690 memset(&fl6, 0, sizeof(fl6));
691 fl6.flowi6_oif = sk->sk_bound_dev_if;
692 fl6.flowi6_mark = sk->sk_mark;
693
694 if (optlen == 0)
695 goto update;
696
697 /* 1K is probably excessive
698 * 1K is surely not enough, 2K per standard header is 16K.
699 */
700 retv = -EINVAL;
701 if (optlen > 64*1024)
702 break;
703
704 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
705 retv = -ENOBUFS;
706 if (!opt)
707 break;
708
709 memset(opt, 0, sizeof(*opt));
710 refcount_set(&opt->refcnt, 1);
711 opt->tot_len = sizeof(*opt) + optlen;
712 retv = -EFAULT;
713 if (copy_from_sockptr(opt + 1, optval, optlen))
714 goto done;
715
716 msg.msg_controllen = optlen;
717 msg.msg_control = (void *)(opt+1);
718 ipc6.opt = opt;
719
720 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
721 if (retv)
722 goto done;
723 update:
724 retv = 0;
725 opt = ipv6_update_options(sk, opt);
726 done:
727 if (opt) {
728 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
729 txopt_put(opt);
730 }
731 break;
732 }
733 case IPV6_UNICAST_HOPS:
734 if (optlen < sizeof(int))
735 goto e_inval;
736 if (val > 255 || val < -1)
737 goto e_inval;
738 np->hop_limit = val;
739 retv = 0;
740 break;
741
742 case IPV6_MULTICAST_HOPS:
743 if (sk->sk_type == SOCK_STREAM)
744 break;
745 if (optlen < sizeof(int))
746 goto e_inval;
747 if (val > 255 || val < -1)
748 goto e_inval;
749 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
750 retv = 0;
751 break;
752
753 case IPV6_MULTICAST_LOOP:
754 if (optlen < sizeof(int))
755 goto e_inval;
756 if (val != valbool)
757 goto e_inval;
758 np->mc_loop = valbool;
759 retv = 0;
760 break;
761
762 case IPV6_UNICAST_IF:
763 {
764 struct net_device *dev = NULL;
765 int ifindex;
766
767 if (optlen != sizeof(int))
768 goto e_inval;
769
770 ifindex = (__force int)ntohl((__force __be32)val);
771 if (ifindex == 0) {
772 np->ucast_oif = 0;
773 retv = 0;
774 break;
775 }
776
777 dev = dev_get_by_index(net, ifindex);
778 retv = -EADDRNOTAVAIL;
779 if (!dev)
780 break;
781 dev_put(dev);
782
783 retv = -EINVAL;
784 if (sk->sk_bound_dev_if)
785 break;
786
787 np->ucast_oif = ifindex;
788 retv = 0;
789 break;
790 }
791
792 case IPV6_MULTICAST_IF:
793 if (sk->sk_type == SOCK_STREAM)
794 break;
795 if (optlen < sizeof(int))
796 goto e_inval;
797
798 if (val) {
799 struct net_device *dev;
800 int midx;
801
802 rcu_read_lock();
803
804 dev = dev_get_by_index_rcu(net, val);
805 if (!dev) {
806 rcu_read_unlock();
807 retv = -ENODEV;
808 break;
809 }
810 midx = l3mdev_master_ifindex_rcu(dev);
811
812 rcu_read_unlock();
813
814 if (sk->sk_bound_dev_if &&
815 sk->sk_bound_dev_if != val &&
816 (!midx || midx != sk->sk_bound_dev_if))
817 goto e_inval;
818 }
819 np->mcast_oif = val;
820 retv = 0;
821 break;
822 case IPV6_ADD_MEMBERSHIP:
823 case IPV6_DROP_MEMBERSHIP:
824 {
825 struct ipv6_mreq mreq;
826
827 if (optlen < sizeof(struct ipv6_mreq))
828 goto e_inval;
829
830 retv = -EPROTO;
831 if (inet_sk(sk)->is_icsk)
832 break;
833
834 retv = -EFAULT;
835 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
836 break;
837
838 if (optname == IPV6_ADD_MEMBERSHIP)
839 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
840 else
841 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
842 break;
843 }
844 case IPV6_JOIN_ANYCAST:
845 case IPV6_LEAVE_ANYCAST:
846 {
847 struct ipv6_mreq mreq;
848
849 if (optlen < sizeof(struct ipv6_mreq))
850 goto e_inval;
851
852 retv = -EFAULT;
853 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
854 break;
855
856 if (optname == IPV6_JOIN_ANYCAST)
857 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
858 else
859 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
860 break;
861 }
862 case IPV6_MULTICAST_ALL:
863 if (optlen < sizeof(int))
864 goto e_inval;
865 np->mc_all = valbool;
866 retv = 0;
867 break;
868
869 case MCAST_JOIN_GROUP:
870 case MCAST_LEAVE_GROUP:
871 if (in_compat_syscall())
872 retv = compat_ipv6_mcast_join_leave(sk, optname, optval,
873 optlen);
874 else
875 retv = ipv6_mcast_join_leave(sk, optname, optval,
876 optlen);
877 break;
878 case MCAST_JOIN_SOURCE_GROUP:
879 case MCAST_LEAVE_SOURCE_GROUP:
880 case MCAST_BLOCK_SOURCE:
881 case MCAST_UNBLOCK_SOURCE:
882 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen);
883 break;
884 case MCAST_MSFILTER:
885 if (in_compat_syscall())
886 retv = compat_ipv6_set_mcast_msfilter(sk, optval,
887 optlen);
888 else
889 retv = ipv6_set_mcast_msfilter(sk, optval, optlen);
890 break;
891 case IPV6_ROUTER_ALERT:
892 if (optlen < sizeof(int))
893 goto e_inval;
894 retv = ip6_ra_control(sk, val);
895 break;
896 case IPV6_ROUTER_ALERT_ISOLATE:
897 if (optlen < sizeof(int))
898 goto e_inval;
899 np->rtalert_isolate = valbool;
900 retv = 0;
901 break;
902 case IPV6_MTU_DISCOVER:
903 if (optlen < sizeof(int))
904 goto e_inval;
905 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
906 goto e_inval;
907 np->pmtudisc = val;
908 retv = 0;
909 break;
910 case IPV6_MTU:
911 if (optlen < sizeof(int))
912 goto e_inval;
913 if (val && val < IPV6_MIN_MTU)
914 goto e_inval;
915 np->frag_size = val;
916 retv = 0;
917 break;
918 case IPV6_RECVERR:
919 if (optlen < sizeof(int))
920 goto e_inval;
921 np->recverr = valbool;
922 if (!val)
923 skb_queue_purge(&sk->sk_error_queue);
924 retv = 0;
925 break;
926 case IPV6_FLOWINFO_SEND:
927 if (optlen < sizeof(int))
928 goto e_inval;
929 np->sndflow = valbool;
930 retv = 0;
931 break;
932 case IPV6_FLOWLABEL_MGR:
933 retv = ipv6_flowlabel_opt(sk, optval, optlen);
934 break;
935 case IPV6_IPSEC_POLICY:
936 case IPV6_XFRM_POLICY:
937 retv = -EPERM;
938 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
939 break;
940 retv = xfrm_user_policy(sk, optname, optval, optlen);
941 break;
942
943 case IPV6_ADDR_PREFERENCES:
944 if (optlen < sizeof(int))
945 goto e_inval;
946 retv = __ip6_sock_set_addr_preferences(sk, val);
947 break;
948 case IPV6_MINHOPCOUNT:
949 if (optlen < sizeof(int))
950 goto e_inval;
951 if (val < 0 || val > 255)
952 goto e_inval;
953 np->min_hopcount = val;
954 retv = 0;
955 break;
956 case IPV6_DONTFRAG:
957 np->dontfrag = valbool;
958 retv = 0;
959 break;
960 case IPV6_AUTOFLOWLABEL:
961 np->autoflowlabel = valbool;
962 np->autoflowlabel_set = 1;
963 retv = 0;
964 break;
965 case IPV6_RECVFRAGSIZE:
966 np->rxopt.bits.recvfragsize = valbool;
967 retv = 0;
968 break;
969 case IPV6_RECVERR_RFC4884:
970 if (optlen < sizeof(int))
971 goto e_inval;
972 if (val < 0 || val > 1)
973 goto e_inval;
974 np->recverr_rfc4884 = valbool;
975 retv = 0;
976 break;
977 }
978
979 release_sock(sk);
980 if (needs_rtnl)
981 rtnl_unlock();
982
983 return retv;
984
985 e_inval:
986 release_sock(sk);
987 if (needs_rtnl)
988 rtnl_unlock();
989 return -EINVAL;
990 }
991
992 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
993 unsigned int optlen)
994 {
995 int err;
996
997 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
998 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
999
1000 if (level != SOL_IPV6)
1001 return -ENOPROTOOPT;
1002
1003 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
1004 #ifdef CONFIG_NETFILTER
1005 /* we need to exclude all possible ENOPROTOOPTs except default case */
1006 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
1007 optname != IPV6_XFRM_POLICY)
1008 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
1009 #endif
1010 return err;
1011 }
1012 EXPORT_SYMBOL(ipv6_setsockopt);
1013
1014 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
1015 int optname, char __user *optval, int len)
1016 {
1017 struct ipv6_opt_hdr *hdr;
1018
1019 if (!opt)
1020 return 0;
1021
1022 switch (optname) {
1023 case IPV6_HOPOPTS:
1024 hdr = opt->hopopt;
1025 break;
1026 case IPV6_RTHDRDSTOPTS:
1027 hdr = opt->dst0opt;
1028 break;
1029 case IPV6_RTHDR:
1030 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1031 break;
1032 case IPV6_DSTOPTS:
1033 hdr = opt->dst1opt;
1034 break;
1035 default:
1036 return -EINVAL; /* should not happen */
1037 }
1038
1039 if (!hdr)
1040 return 0;
1041
1042 len = min_t(unsigned int, len, ipv6_optlen(hdr));
1043 if (copy_to_user(optval, hdr, len))
1044 return -EFAULT;
1045 return len;
1046 }
1047
1048 static int ipv6_get_msfilter(struct sock *sk, void __user *optval,
1049 int __user *optlen, int len)
1050 {
1051 const int size0 = offsetof(struct group_filter, gf_slist_flex);
1052 struct group_filter __user *p = optval;
1053 struct group_filter gsf;
1054 int num;
1055 int err;
1056
1057 if (len < size0)
1058 return -EINVAL;
1059 if (copy_from_user(&gsf, p, size0))
1060 return -EFAULT;
1061 if (gsf.gf_group.ss_family != AF_INET6)
1062 return -EADDRNOTAVAIL;
1063 num = gsf.gf_numsrc;
1064 lock_sock(sk);
1065 err = ip6_mc_msfget(sk, &gsf, p->gf_slist_flex);
1066 if (!err) {
1067 if (num > gsf.gf_numsrc)
1068 num = gsf.gf_numsrc;
1069 if (put_user(GROUP_FILTER_SIZE(num), optlen) ||
1070 copy_to_user(p, &gsf, size0))
1071 err = -EFAULT;
1072 }
1073 release_sock(sk);
1074 return err;
1075 }
1076
1077 static int compat_ipv6_get_msfilter(struct sock *sk, void __user *optval,
1078 int __user *optlen)
1079 {
1080 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
1081 struct compat_group_filter __user *p = optval;
1082 struct compat_group_filter gf32;
1083 struct group_filter gf;
1084 int len, err;
1085 int num;
1086
1087 if (get_user(len, optlen))
1088 return -EFAULT;
1089 if (len < size0)
1090 return -EINVAL;
1091
1092 if (copy_from_user(&gf32, p, size0))
1093 return -EFAULT;
1094 gf.gf_interface = gf32.gf_interface;
1095 gf.gf_fmode = gf32.gf_fmode;
1096 num = gf.gf_numsrc = gf32.gf_numsrc;
1097 gf.gf_group = gf32.gf_group;
1098
1099 if (gf.gf_group.ss_family != AF_INET6)
1100 return -EADDRNOTAVAIL;
1101
1102 lock_sock(sk);
1103 err = ip6_mc_msfget(sk, &gf, p->gf_slist_flex);
1104 release_sock(sk);
1105 if (err)
1106 return err;
1107 if (num > gf.gf_numsrc)
1108 num = gf.gf_numsrc;
1109 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32));
1110 if (put_user(len, optlen) ||
1111 put_user(gf.gf_fmode, &p->gf_fmode) ||
1112 put_user(gf.gf_numsrc, &p->gf_numsrc))
1113 return -EFAULT;
1114 return 0;
1115 }
1116
1117 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1118 char __user *optval, int __user *optlen, unsigned int flags)
1119 {
1120 struct ipv6_pinfo *np = inet6_sk(sk);
1121 int len;
1122 int val;
1123
1124 if (ip6_mroute_opt(optname))
1125 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1126
1127 if (get_user(len, optlen))
1128 return -EFAULT;
1129 switch (optname) {
1130 case IPV6_ADDRFORM:
1131 if (sk->sk_protocol != IPPROTO_UDP &&
1132 sk->sk_protocol != IPPROTO_UDPLITE &&
1133 sk->sk_protocol != IPPROTO_TCP)
1134 return -ENOPROTOOPT;
1135 if (sk->sk_state != TCP_ESTABLISHED)
1136 return -ENOTCONN;
1137 val = sk->sk_family;
1138 break;
1139 case MCAST_MSFILTER:
1140 if (in_compat_syscall())
1141 return compat_ipv6_get_msfilter(sk, optval, optlen);
1142 return ipv6_get_msfilter(sk, optval, optlen, len);
1143 case IPV6_2292PKTOPTIONS:
1144 {
1145 struct msghdr msg;
1146 struct sk_buff *skb;
1147
1148 if (sk->sk_type != SOCK_STREAM)
1149 return -ENOPROTOOPT;
1150
1151 msg.msg_control_user = optval;
1152 msg.msg_controllen = len;
1153 msg.msg_flags = flags;
1154 msg.msg_control_is_user = true;
1155
1156 lock_sock(sk);
1157 skb = np->pktoptions;
1158 if (skb)
1159 ip6_datagram_recv_ctl(sk, &msg, skb);
1160 release_sock(sk);
1161 if (!skb) {
1162 if (np->rxopt.bits.rxinfo) {
1163 struct in6_pktinfo src_info;
1164 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1165 np->sticky_pktinfo.ipi6_ifindex;
1166 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1167 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1168 }
1169 if (np->rxopt.bits.rxhlim) {
1170 int hlim = np->mcast_hops;
1171 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1172 }
1173 if (np->rxopt.bits.rxtclass) {
1174 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1175
1176 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1177 }
1178 if (np->rxopt.bits.rxoinfo) {
1179 struct in6_pktinfo src_info;
1180 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1181 np->sticky_pktinfo.ipi6_ifindex;
1182 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1183 np->sticky_pktinfo.ipi6_addr;
1184 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1185 }
1186 if (np->rxopt.bits.rxohlim) {
1187 int hlim = np->mcast_hops;
1188 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1189 }
1190 if (np->rxopt.bits.rxflow) {
1191 __be32 flowinfo = np->rcv_flowinfo;
1192
1193 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1194 }
1195 }
1196 len -= msg.msg_controllen;
1197 return put_user(len, optlen);
1198 }
1199 case IPV6_MTU:
1200 {
1201 struct dst_entry *dst;
1202
1203 val = 0;
1204 rcu_read_lock();
1205 dst = __sk_dst_get(sk);
1206 if (dst)
1207 val = dst_mtu(dst);
1208 rcu_read_unlock();
1209 if (!val)
1210 return -ENOTCONN;
1211 break;
1212 }
1213
1214 case IPV6_V6ONLY:
1215 val = sk->sk_ipv6only;
1216 break;
1217
1218 case IPV6_RECVPKTINFO:
1219 val = np->rxopt.bits.rxinfo;
1220 break;
1221
1222 case IPV6_2292PKTINFO:
1223 val = np->rxopt.bits.rxoinfo;
1224 break;
1225
1226 case IPV6_RECVHOPLIMIT:
1227 val = np->rxopt.bits.rxhlim;
1228 break;
1229
1230 case IPV6_2292HOPLIMIT:
1231 val = np->rxopt.bits.rxohlim;
1232 break;
1233
1234 case IPV6_RECVRTHDR:
1235 val = np->rxopt.bits.srcrt;
1236 break;
1237
1238 case IPV6_2292RTHDR:
1239 val = np->rxopt.bits.osrcrt;
1240 break;
1241
1242 case IPV6_HOPOPTS:
1243 case IPV6_RTHDRDSTOPTS:
1244 case IPV6_RTHDR:
1245 case IPV6_DSTOPTS:
1246 {
1247 struct ipv6_txoptions *opt;
1248
1249 lock_sock(sk);
1250 opt = rcu_dereference_protected(np->opt,
1251 lockdep_sock_is_held(sk));
1252 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1253 release_sock(sk);
1254 /* check if ipv6_getsockopt_sticky() returns err code */
1255 if (len < 0)
1256 return len;
1257 return put_user(len, optlen);
1258 }
1259
1260 case IPV6_RECVHOPOPTS:
1261 val = np->rxopt.bits.hopopts;
1262 break;
1263
1264 case IPV6_2292HOPOPTS:
1265 val = np->rxopt.bits.ohopopts;
1266 break;
1267
1268 case IPV6_RECVDSTOPTS:
1269 val = np->rxopt.bits.dstopts;
1270 break;
1271
1272 case IPV6_2292DSTOPTS:
1273 val = np->rxopt.bits.odstopts;
1274 break;
1275
1276 case IPV6_TCLASS:
1277 val = np->tclass;
1278 break;
1279
1280 case IPV6_RECVTCLASS:
1281 val = np->rxopt.bits.rxtclass;
1282 break;
1283
1284 case IPV6_FLOWINFO:
1285 val = np->rxopt.bits.rxflow;
1286 break;
1287
1288 case IPV6_RECVPATHMTU:
1289 val = np->rxopt.bits.rxpmtu;
1290 break;
1291
1292 case IPV6_PATHMTU:
1293 {
1294 struct dst_entry *dst;
1295 struct ip6_mtuinfo mtuinfo;
1296
1297 if (len < sizeof(mtuinfo))
1298 return -EINVAL;
1299
1300 len = sizeof(mtuinfo);
1301 memset(&mtuinfo, 0, sizeof(mtuinfo));
1302
1303 rcu_read_lock();
1304 dst = __sk_dst_get(sk);
1305 if (dst)
1306 mtuinfo.ip6m_mtu = dst_mtu(dst);
1307 rcu_read_unlock();
1308 if (!mtuinfo.ip6m_mtu)
1309 return -ENOTCONN;
1310
1311 if (put_user(len, optlen))
1312 return -EFAULT;
1313 if (copy_to_user(optval, &mtuinfo, len))
1314 return -EFAULT;
1315
1316 return 0;
1317 }
1318
1319 case IPV6_TRANSPARENT:
1320 val = inet_sk(sk)->transparent;
1321 break;
1322
1323 case IPV6_FREEBIND:
1324 val = inet_sk(sk)->freebind;
1325 break;
1326
1327 case IPV6_RECVORIGDSTADDR:
1328 val = np->rxopt.bits.rxorigdstaddr;
1329 break;
1330
1331 case IPV6_UNICAST_HOPS:
1332 case IPV6_MULTICAST_HOPS:
1333 {
1334 struct dst_entry *dst;
1335
1336 if (optname == IPV6_UNICAST_HOPS)
1337 val = np->hop_limit;
1338 else
1339 val = np->mcast_hops;
1340
1341 if (val < 0) {
1342 rcu_read_lock();
1343 dst = __sk_dst_get(sk);
1344 if (dst)
1345 val = ip6_dst_hoplimit(dst);
1346 rcu_read_unlock();
1347 }
1348
1349 if (val < 0)
1350 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1351 break;
1352 }
1353
1354 case IPV6_MULTICAST_LOOP:
1355 val = np->mc_loop;
1356 break;
1357
1358 case IPV6_MULTICAST_IF:
1359 val = np->mcast_oif;
1360 break;
1361
1362 case IPV6_MULTICAST_ALL:
1363 val = np->mc_all;
1364 break;
1365
1366 case IPV6_UNICAST_IF:
1367 val = (__force int)htonl((__u32) np->ucast_oif);
1368 break;
1369
1370 case IPV6_MTU_DISCOVER:
1371 val = np->pmtudisc;
1372 break;
1373
1374 case IPV6_RECVERR:
1375 val = np->recverr;
1376 break;
1377
1378 case IPV6_FLOWINFO_SEND:
1379 val = np->sndflow;
1380 break;
1381
1382 case IPV6_FLOWLABEL_MGR:
1383 {
1384 struct in6_flowlabel_req freq;
1385 int flags;
1386
1387 if (len < sizeof(freq))
1388 return -EINVAL;
1389
1390 if (copy_from_user(&freq, optval, sizeof(freq)))
1391 return -EFAULT;
1392
1393 if (freq.flr_action != IPV6_FL_A_GET)
1394 return -EINVAL;
1395
1396 len = sizeof(freq);
1397 flags = freq.flr_flags;
1398
1399 memset(&freq, 0, sizeof(freq));
1400
1401 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1402 if (val < 0)
1403 return val;
1404
1405 if (put_user(len, optlen))
1406 return -EFAULT;
1407 if (copy_to_user(optval, &freq, len))
1408 return -EFAULT;
1409
1410 return 0;
1411 }
1412
1413 case IPV6_ADDR_PREFERENCES:
1414 val = 0;
1415
1416 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1417 val |= IPV6_PREFER_SRC_TMP;
1418 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1419 val |= IPV6_PREFER_SRC_PUBLIC;
1420 else {
1421 /* XXX: should we return system default? */
1422 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1423 }
1424
1425 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1426 val |= IPV6_PREFER_SRC_COA;
1427 else
1428 val |= IPV6_PREFER_SRC_HOME;
1429 break;
1430
1431 case IPV6_MINHOPCOUNT:
1432 val = np->min_hopcount;
1433 break;
1434
1435 case IPV6_DONTFRAG:
1436 val = np->dontfrag;
1437 break;
1438
1439 case IPV6_AUTOFLOWLABEL:
1440 val = ip6_autoflowlabel(sock_net(sk), np);
1441 break;
1442
1443 case IPV6_RECVFRAGSIZE:
1444 val = np->rxopt.bits.recvfragsize;
1445 break;
1446
1447 case IPV6_ROUTER_ALERT_ISOLATE:
1448 val = np->rtalert_isolate;
1449 break;
1450
1451 case IPV6_RECVERR_RFC4884:
1452 val = np->recverr_rfc4884;
1453 break;
1454
1455 default:
1456 return -ENOPROTOOPT;
1457 }
1458 len = min_t(unsigned int, sizeof(int), len);
1459 if (put_user(len, optlen))
1460 return -EFAULT;
1461 if (copy_to_user(optval, &val, len))
1462 return -EFAULT;
1463 return 0;
1464 }
1465
1466 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1467 char __user *optval, int __user *optlen)
1468 {
1469 int err;
1470
1471 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1472 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1473
1474 if (level != SOL_IPV6)
1475 return -ENOPROTOOPT;
1476
1477 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1478 #ifdef CONFIG_NETFILTER
1479 /* we need to exclude all possible ENOPROTOOPTs except default case */
1480 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1481 int len;
1482
1483 if (get_user(len, optlen))
1484 return -EFAULT;
1485
1486 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1487 if (err >= 0)
1488 err = put_user(len, optlen);
1489 }
1490 #endif
1491 return err;
1492 }
1493 EXPORT_SYMBOL(ipv6_getsockopt);
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