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
ip6_ra_control(struct sock * sk,int sel)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
ipv6_update_options(struct sock * sk,struct ipv6_txoptions * opt)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
setsockopt_needs_rtnl(int optname)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
copy_group_source_from_sockptr(struct group_source_req * greqs,sockptr_t optval,int optlen)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
do_ipv6_mcast_group_source(struct sock * sk,int optname,sockptr_t optval,int optlen)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
ipv6_set_mcast_msfilter(struct sock * sk,sockptr_t optval,int optlen)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);
229 out_free_gsf:
230 kfree(gsf);
231 return ret;
232 }
233
compat_ipv6_set_mcast_msfilter(struct sock * sk,sockptr_t optval,int optlen)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);
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 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[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);
272
273 out_free_p:
274 kfree(p);
275 return ret;
276 }
277
ipv6_mcast_join_leave(struct sock * sk,int optname,sockptr_t optval,int optlen)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
compat_ipv6_mcast_join_leave(struct sock * sk,int optname,sockptr_t optval,int optlen)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
ipv6_set_opt_hdr(struct sock * sk,int optname,sockptr_t optval,int optlen)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
do_ipv6_setsockopt(struct sock * sk,int level,int optname,sockptr_t optval,unsigned int optlen)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 /* Another thread has converted the socket into IPv4 with
421 * IPV6_ADDRFORM concurrently.
422 */
423 if (unlikely(sk->sk_family != AF_INET6))
424 goto unlock;
425
426 switch (optname) {
427
428 case IPV6_ADDRFORM:
429 if (optlen < sizeof(int))
430 goto e_inval;
431 if (val == PF_INET) {
432 struct ipv6_txoptions *opt;
433 struct sk_buff *pktopt;
434
435 if (sk->sk_type == SOCK_RAW)
436 break;
437
438 if (sk->sk_protocol == IPPROTO_UDP ||
439 sk->sk_protocol == IPPROTO_UDPLITE) {
440 struct udp_sock *up = udp_sk(sk);
441 if (up->pending == AF_INET6) {
442 retv = -EBUSY;
443 break;
444 }
445 } else if (sk->sk_protocol == IPPROTO_TCP) {
446 if (sk->sk_prot != &tcpv6_prot) {
447 retv = -EBUSY;
448 break;
449 }
450 } else {
451 break;
452 }
453
454 if (sk->sk_state != TCP_ESTABLISHED) {
455 retv = -ENOTCONN;
456 break;
457 }
458
459 if (ipv6_only_sock(sk) ||
460 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
461 retv = -EADDRNOTAVAIL;
462 break;
463 }
464
465 fl6_free_socklist(sk);
466 __ipv6_sock_mc_close(sk);
467 __ipv6_sock_ac_close(sk);
468
469 /*
470 * Sock is moving from IPv6 to IPv4 (sk_prot), so
471 * remove it from the refcnt debug socks count in the
472 * original family...
473 */
474 sk_refcnt_debug_dec(sk);
475
476 if (sk->sk_protocol == IPPROTO_TCP) {
477 struct inet_connection_sock *icsk = inet_csk(sk);
478 local_bh_disable();
479 sock_prot_inuse_add(net, sk->sk_prot, -1);
480 sock_prot_inuse_add(net, &tcp_prot, 1);
481 local_bh_enable();
482 /* Paired with READ_ONCE(sk->sk_prot) in inet6_stream_ops */
483 WRITE_ONCE(sk->sk_prot, &tcp_prot);
484 /* Paired with READ_ONCE() in tcp_(get|set)sockopt() */
485 WRITE_ONCE(icsk->icsk_af_ops, &ipv4_specific);
486 sk->sk_socket->ops = &inet_stream_ops;
487 sk->sk_family = PF_INET;
488 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
489 } else {
490 struct proto *prot = &udp_prot;
491
492 if (sk->sk_protocol == IPPROTO_UDPLITE)
493 prot = &udplite_prot;
494 local_bh_disable();
495 sock_prot_inuse_add(net, sk->sk_prot, -1);
496 sock_prot_inuse_add(net, prot, 1);
497 local_bh_enable();
498 /* Paired with READ_ONCE(sk->sk_prot) in inet6_dgram_ops */
499 WRITE_ONCE(sk->sk_prot, prot);
500 sk->sk_socket->ops = &inet_dgram_ops;
501 sk->sk_family = PF_INET;
502 }
503 opt = xchg((__force struct ipv6_txoptions **)&np->opt,
504 NULL);
505 if (opt) {
506 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
507 txopt_put(opt);
508 }
509 pktopt = xchg(&np->pktoptions, NULL);
510 kfree_skb(pktopt);
511
512 /*
513 * ... and add it to the refcnt debug socks count
514 * in the new family. -acme
515 */
516 sk_refcnt_debug_inc(sk);
517 module_put(THIS_MODULE);
518 retv = 0;
519 break;
520 }
521 goto e_inval;
522
523 case IPV6_V6ONLY:
524 if (optlen < sizeof(int) ||
525 inet_sk(sk)->inet_num)
526 goto e_inval;
527 sk->sk_ipv6only = valbool;
528 retv = 0;
529 break;
530
531 case IPV6_RECVPKTINFO:
532 if (optlen < sizeof(int))
533 goto e_inval;
534 np->rxopt.bits.rxinfo = valbool;
535 retv = 0;
536 break;
537
538 case IPV6_2292PKTINFO:
539 if (optlen < sizeof(int))
540 goto e_inval;
541 np->rxopt.bits.rxoinfo = valbool;
542 retv = 0;
543 break;
544
545 case IPV6_RECVHOPLIMIT:
546 if (optlen < sizeof(int))
547 goto e_inval;
548 np->rxopt.bits.rxhlim = valbool;
549 retv = 0;
550 break;
551
552 case IPV6_2292HOPLIMIT:
553 if (optlen < sizeof(int))
554 goto e_inval;
555 np->rxopt.bits.rxohlim = valbool;
556 retv = 0;
557 break;
558
559 case IPV6_RECVRTHDR:
560 if (optlen < sizeof(int))
561 goto e_inval;
562 np->rxopt.bits.srcrt = valbool;
563 retv = 0;
564 break;
565
566 case IPV6_2292RTHDR:
567 if (optlen < sizeof(int))
568 goto e_inval;
569 np->rxopt.bits.osrcrt = valbool;
570 retv = 0;
571 break;
572
573 case IPV6_RECVHOPOPTS:
574 if (optlen < sizeof(int))
575 goto e_inval;
576 np->rxopt.bits.hopopts = valbool;
577 retv = 0;
578 break;
579
580 case IPV6_2292HOPOPTS:
581 if (optlen < sizeof(int))
582 goto e_inval;
583 np->rxopt.bits.ohopopts = valbool;
584 retv = 0;
585 break;
586
587 case IPV6_RECVDSTOPTS:
588 if (optlen < sizeof(int))
589 goto e_inval;
590 np->rxopt.bits.dstopts = valbool;
591 retv = 0;
592 break;
593
594 case IPV6_2292DSTOPTS:
595 if (optlen < sizeof(int))
596 goto e_inval;
597 np->rxopt.bits.odstopts = valbool;
598 retv = 0;
599 break;
600
601 case IPV6_TCLASS:
602 if (optlen < sizeof(int))
603 goto e_inval;
604 if (val < -1 || val > 0xff)
605 goto e_inval;
606 /* RFC 3542, 6.5: default traffic class of 0x0 */
607 if (val == -1)
608 val = 0;
609 np->tclass = val;
610 retv = 0;
611 break;
612
613 case IPV6_RECVTCLASS:
614 if (optlen < sizeof(int))
615 goto e_inval;
616 np->rxopt.bits.rxtclass = valbool;
617 retv = 0;
618 break;
619
620 case IPV6_FLOWINFO:
621 if (optlen < sizeof(int))
622 goto e_inval;
623 np->rxopt.bits.rxflow = valbool;
624 retv = 0;
625 break;
626
627 case IPV6_RECVPATHMTU:
628 if (optlen < sizeof(int))
629 goto e_inval;
630 np->rxopt.bits.rxpmtu = valbool;
631 retv = 0;
632 break;
633
634 case IPV6_TRANSPARENT:
635 if (valbool && !ns_capable(net->user_ns, CAP_NET_RAW) &&
636 !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
637 retv = -EPERM;
638 break;
639 }
640 if (optlen < sizeof(int))
641 goto e_inval;
642 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
643 inet_sk(sk)->transparent = valbool;
644 retv = 0;
645 break;
646
647 case IPV6_FREEBIND:
648 if (optlen < sizeof(int))
649 goto e_inval;
650 /* we also don't have a separate freebind bit for IPV6 */
651 inet_sk(sk)->freebind = valbool;
652 retv = 0;
653 break;
654
655 case IPV6_RECVORIGDSTADDR:
656 if (optlen < sizeof(int))
657 goto e_inval;
658 np->rxopt.bits.rxorigdstaddr = valbool;
659 retv = 0;
660 break;
661
662 case IPV6_HOPOPTS:
663 case IPV6_RTHDRDSTOPTS:
664 case IPV6_RTHDR:
665 case IPV6_DSTOPTS:
666 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen);
667 break;
668
669 case IPV6_PKTINFO:
670 {
671 struct in6_pktinfo pkt;
672
673 if (optlen == 0)
674 goto e_inval;
675 else if (optlen < sizeof(struct in6_pktinfo) ||
676 sockptr_is_null(optval))
677 goto e_inval;
678
679 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) {
680 retv = -EFAULT;
681 break;
682 }
683 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
684 goto e_inval;
685
686 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
687 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
688 retv = 0;
689 break;
690 }
691
692 case IPV6_2292PKTOPTIONS:
693 {
694 struct ipv6_txoptions *opt = NULL;
695 struct msghdr msg;
696 struct flowi6 fl6;
697 struct ipcm6_cookie ipc6;
698
699 memset(&fl6, 0, sizeof(fl6));
700 fl6.flowi6_oif = sk->sk_bound_dev_if;
701 fl6.flowi6_mark = sk->sk_mark;
702
703 if (optlen == 0)
704 goto update;
705
706 /* 1K is probably excessive
707 * 1K is surely not enough, 2K per standard header is 16K.
708 */
709 retv = -EINVAL;
710 if (optlen > 64*1024)
711 break;
712
713 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
714 retv = -ENOBUFS;
715 if (!opt)
716 break;
717
718 memset(opt, 0, sizeof(*opt));
719 refcount_set(&opt->refcnt, 1);
720 opt->tot_len = sizeof(*opt) + optlen;
721 retv = -EFAULT;
722 if (copy_from_sockptr(opt + 1, optval, optlen))
723 goto done;
724
725 msg.msg_controllen = optlen;
726 msg.msg_control = (void *)(opt+1);
727 ipc6.opt = opt;
728
729 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
730 if (retv)
731 goto done;
732 update:
733 retv = 0;
734 opt = ipv6_update_options(sk, opt);
735 done:
736 if (opt) {
737 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
738 txopt_put(opt);
739 }
740 break;
741 }
742 case IPV6_UNICAST_HOPS:
743 if (optlen < sizeof(int))
744 goto e_inval;
745 if (val > 255 || val < -1)
746 goto e_inval;
747 np->hop_limit = val;
748 retv = 0;
749 break;
750
751 case IPV6_MULTICAST_HOPS:
752 if (sk->sk_type == SOCK_STREAM)
753 break;
754 if (optlen < sizeof(int))
755 goto e_inval;
756 if (val > 255 || val < -1)
757 goto e_inval;
758 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
759 retv = 0;
760 break;
761
762 case IPV6_MULTICAST_LOOP:
763 if (optlen < sizeof(int))
764 goto e_inval;
765 if (val != valbool)
766 goto e_inval;
767 np->mc_loop = valbool;
768 retv = 0;
769 break;
770
771 case IPV6_UNICAST_IF:
772 {
773 struct net_device *dev = NULL;
774 int ifindex;
775
776 if (optlen != sizeof(int))
777 goto e_inval;
778
779 ifindex = (__force int)ntohl((__force __be32)val);
780 if (ifindex == 0) {
781 np->ucast_oif = 0;
782 retv = 0;
783 break;
784 }
785
786 dev = dev_get_by_index(net, ifindex);
787 retv = -EADDRNOTAVAIL;
788 if (!dev)
789 break;
790 dev_put(dev);
791
792 retv = -EINVAL;
793 if (sk->sk_bound_dev_if)
794 break;
795
796 np->ucast_oif = ifindex;
797 retv = 0;
798 break;
799 }
800
801 case IPV6_MULTICAST_IF:
802 if (sk->sk_type == SOCK_STREAM)
803 break;
804 if (optlen < sizeof(int))
805 goto e_inval;
806
807 if (val) {
808 struct net_device *dev;
809 int midx;
810
811 rcu_read_lock();
812
813 dev = dev_get_by_index_rcu(net, val);
814 if (!dev) {
815 rcu_read_unlock();
816 retv = -ENODEV;
817 break;
818 }
819 midx = l3mdev_master_ifindex_rcu(dev);
820
821 rcu_read_unlock();
822
823 if (sk->sk_bound_dev_if &&
824 sk->sk_bound_dev_if != val &&
825 (!midx || midx != sk->sk_bound_dev_if))
826 goto e_inval;
827 }
828 np->mcast_oif = val;
829 retv = 0;
830 break;
831 case IPV6_ADD_MEMBERSHIP:
832 case IPV6_DROP_MEMBERSHIP:
833 {
834 struct ipv6_mreq mreq;
835
836 if (optlen < sizeof(struct ipv6_mreq))
837 goto e_inval;
838
839 retv = -EPROTO;
840 if (inet_sk(sk)->is_icsk)
841 break;
842
843 retv = -EFAULT;
844 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
845 break;
846
847 if (optname == IPV6_ADD_MEMBERSHIP)
848 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
849 else
850 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
851 break;
852 }
853 case IPV6_JOIN_ANYCAST:
854 case IPV6_LEAVE_ANYCAST:
855 {
856 struct ipv6_mreq mreq;
857
858 if (optlen < sizeof(struct ipv6_mreq))
859 goto e_inval;
860
861 retv = -EFAULT;
862 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
863 break;
864
865 if (optname == IPV6_JOIN_ANYCAST)
866 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
867 else
868 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
869 break;
870 }
871 case IPV6_MULTICAST_ALL:
872 if (optlen < sizeof(int))
873 goto e_inval;
874 np->mc_all = valbool;
875 retv = 0;
876 break;
877
878 case MCAST_JOIN_GROUP:
879 case MCAST_LEAVE_GROUP:
880 if (in_compat_syscall())
881 retv = compat_ipv6_mcast_join_leave(sk, optname, optval,
882 optlen);
883 else
884 retv = ipv6_mcast_join_leave(sk, optname, optval,
885 optlen);
886 break;
887 case MCAST_JOIN_SOURCE_GROUP:
888 case MCAST_LEAVE_SOURCE_GROUP:
889 case MCAST_BLOCK_SOURCE:
890 case MCAST_UNBLOCK_SOURCE:
891 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen);
892 break;
893 case MCAST_MSFILTER:
894 if (in_compat_syscall())
895 retv = compat_ipv6_set_mcast_msfilter(sk, optval,
896 optlen);
897 else
898 retv = ipv6_set_mcast_msfilter(sk, optval, optlen);
899 break;
900 case IPV6_ROUTER_ALERT:
901 if (optlen < sizeof(int))
902 goto e_inval;
903 retv = ip6_ra_control(sk, val);
904 break;
905 case IPV6_ROUTER_ALERT_ISOLATE:
906 if (optlen < sizeof(int))
907 goto e_inval;
908 np->rtalert_isolate = valbool;
909 retv = 0;
910 break;
911 case IPV6_MTU_DISCOVER:
912 if (optlen < sizeof(int))
913 goto e_inval;
914 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
915 goto e_inval;
916 np->pmtudisc = val;
917 retv = 0;
918 break;
919 case IPV6_MTU:
920 if (optlen < sizeof(int))
921 goto e_inval;
922 if (val && val < IPV6_MIN_MTU)
923 goto e_inval;
924 np->frag_size = val;
925 retv = 0;
926 break;
927 case IPV6_RECVERR:
928 if (optlen < sizeof(int))
929 goto e_inval;
930 np->recverr = valbool;
931 if (!val)
932 skb_queue_purge(&sk->sk_error_queue);
933 retv = 0;
934 break;
935 case IPV6_FLOWINFO_SEND:
936 if (optlen < sizeof(int))
937 goto e_inval;
938 np->sndflow = valbool;
939 retv = 0;
940 break;
941 case IPV6_FLOWLABEL_MGR:
942 retv = ipv6_flowlabel_opt(sk, optval, optlen);
943 break;
944 case IPV6_IPSEC_POLICY:
945 case IPV6_XFRM_POLICY:
946 retv = -EPERM;
947 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
948 break;
949 retv = xfrm_user_policy(sk, optname, optval, optlen);
950 break;
951
952 case IPV6_ADDR_PREFERENCES:
953 if (optlen < sizeof(int))
954 goto e_inval;
955 retv = __ip6_sock_set_addr_preferences(sk, val);
956 break;
957 case IPV6_MINHOPCOUNT:
958 if (optlen < sizeof(int))
959 goto e_inval;
960 if (val < 0 || val > 255)
961 goto e_inval;
962 np->min_hopcount = val;
963 retv = 0;
964 break;
965 case IPV6_DONTFRAG:
966 np->dontfrag = valbool;
967 retv = 0;
968 break;
969 case IPV6_AUTOFLOWLABEL:
970 np->autoflowlabel = valbool;
971 np->autoflowlabel_set = 1;
972 retv = 0;
973 break;
974 case IPV6_RECVFRAGSIZE:
975 np->rxopt.bits.recvfragsize = valbool;
976 retv = 0;
977 break;
978 case IPV6_RECVERR_RFC4884:
979 if (optlen < sizeof(int))
980 goto e_inval;
981 if (val < 0 || val > 1)
982 goto e_inval;
983 np->recverr_rfc4884 = valbool;
984 retv = 0;
985 break;
986 }
987
988 unlock:
989 release_sock(sk);
990 if (needs_rtnl)
991 rtnl_unlock();
992
993 return retv;
994
995 e_inval:
996 release_sock(sk);
997 if (needs_rtnl)
998 rtnl_unlock();
999 return -EINVAL;
1000 }
1001
ipv6_setsockopt(struct sock * sk,int level,int optname,sockptr_t optval,unsigned int optlen)1002 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1003 unsigned int optlen)
1004 {
1005 int err;
1006
1007 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1008 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
1009
1010 if (level != SOL_IPV6)
1011 return -ENOPROTOOPT;
1012
1013 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
1014 #ifdef CONFIG_NETFILTER
1015 /* we need to exclude all possible ENOPROTOOPTs except default case */
1016 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
1017 optname != IPV6_XFRM_POLICY)
1018 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
1019 #endif
1020 return err;
1021 }
1022 EXPORT_SYMBOL(ipv6_setsockopt);
1023
ipv6_getsockopt_sticky(struct sock * sk,struct ipv6_txoptions * opt,int optname,char __user * optval,int len)1024 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
1025 int optname, char __user *optval, int len)
1026 {
1027 struct ipv6_opt_hdr *hdr;
1028
1029 if (!opt)
1030 return 0;
1031
1032 switch (optname) {
1033 case IPV6_HOPOPTS:
1034 hdr = opt->hopopt;
1035 break;
1036 case IPV6_RTHDRDSTOPTS:
1037 hdr = opt->dst0opt;
1038 break;
1039 case IPV6_RTHDR:
1040 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1041 break;
1042 case IPV6_DSTOPTS:
1043 hdr = opt->dst1opt;
1044 break;
1045 default:
1046 return -EINVAL; /* should not happen */
1047 }
1048
1049 if (!hdr)
1050 return 0;
1051
1052 len = min_t(unsigned int, len, ipv6_optlen(hdr));
1053 if (copy_to_user(optval, hdr, len))
1054 return -EFAULT;
1055 return len;
1056 }
1057
ipv6_get_msfilter(struct sock * sk,void __user * optval,int __user * optlen,int len)1058 static int ipv6_get_msfilter(struct sock *sk, void __user *optval,
1059 int __user *optlen, int len)
1060 {
1061 const int size0 = offsetof(struct group_filter, gf_slist);
1062 struct group_filter __user *p = optval;
1063 struct group_filter gsf;
1064 int num;
1065 int err;
1066
1067 if (len < size0)
1068 return -EINVAL;
1069 if (copy_from_user(&gsf, p, size0))
1070 return -EFAULT;
1071 if (gsf.gf_group.ss_family != AF_INET6)
1072 return -EADDRNOTAVAIL;
1073 num = gsf.gf_numsrc;
1074 lock_sock(sk);
1075 err = ip6_mc_msfget(sk, &gsf, p->gf_slist);
1076 if (!err) {
1077 if (num > gsf.gf_numsrc)
1078 num = gsf.gf_numsrc;
1079 if (put_user(GROUP_FILTER_SIZE(num), optlen) ||
1080 copy_to_user(p, &gsf, size0))
1081 err = -EFAULT;
1082 }
1083 release_sock(sk);
1084 return err;
1085 }
1086
compat_ipv6_get_msfilter(struct sock * sk,void __user * optval,int __user * optlen)1087 static int compat_ipv6_get_msfilter(struct sock *sk, void __user *optval,
1088 int __user *optlen)
1089 {
1090 const int size0 = offsetof(struct compat_group_filter, gf_slist);
1091 struct compat_group_filter __user *p = optval;
1092 struct compat_group_filter gf32;
1093 struct group_filter gf;
1094 int len, err;
1095 int num;
1096
1097 if (get_user(len, optlen))
1098 return -EFAULT;
1099 if (len < size0)
1100 return -EINVAL;
1101
1102 if (copy_from_user(&gf32, p, size0))
1103 return -EFAULT;
1104 gf.gf_interface = gf32.gf_interface;
1105 gf.gf_fmode = gf32.gf_fmode;
1106 num = gf.gf_numsrc = gf32.gf_numsrc;
1107 gf.gf_group = gf32.gf_group;
1108
1109 if (gf.gf_group.ss_family != AF_INET6)
1110 return -EADDRNOTAVAIL;
1111
1112 lock_sock(sk);
1113 err = ip6_mc_msfget(sk, &gf, p->gf_slist);
1114 release_sock(sk);
1115 if (err)
1116 return err;
1117 if (num > gf.gf_numsrc)
1118 num = gf.gf_numsrc;
1119 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32));
1120 if (put_user(len, optlen) ||
1121 put_user(gf.gf_fmode, &p->gf_fmode) ||
1122 put_user(gf.gf_numsrc, &p->gf_numsrc))
1123 return -EFAULT;
1124 return 0;
1125 }
1126
do_ipv6_getsockopt(struct sock * sk,int level,int optname,char __user * optval,int __user * optlen,unsigned int flags)1127 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1128 char __user *optval, int __user *optlen, unsigned int flags)
1129 {
1130 struct ipv6_pinfo *np = inet6_sk(sk);
1131 int len;
1132 int val;
1133
1134 if (ip6_mroute_opt(optname))
1135 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1136
1137 if (get_user(len, optlen))
1138 return -EFAULT;
1139 switch (optname) {
1140 case IPV6_ADDRFORM:
1141 if (sk->sk_protocol != IPPROTO_UDP &&
1142 sk->sk_protocol != IPPROTO_UDPLITE &&
1143 sk->sk_protocol != IPPROTO_TCP)
1144 return -ENOPROTOOPT;
1145 if (sk->sk_state != TCP_ESTABLISHED)
1146 return -ENOTCONN;
1147 val = sk->sk_family;
1148 break;
1149 case MCAST_MSFILTER:
1150 if (in_compat_syscall())
1151 return compat_ipv6_get_msfilter(sk, optval, optlen);
1152 return ipv6_get_msfilter(sk, optval, optlen, len);
1153 case IPV6_2292PKTOPTIONS:
1154 {
1155 struct msghdr msg;
1156 struct sk_buff *skb;
1157
1158 if (sk->sk_type != SOCK_STREAM)
1159 return -ENOPROTOOPT;
1160
1161 msg.msg_control = optval;
1162 msg.msg_controllen = len;
1163 msg.msg_flags = flags;
1164 msg.msg_control_is_user = true;
1165
1166 lock_sock(sk);
1167 skb = np->pktoptions;
1168 if (skb)
1169 ip6_datagram_recv_ctl(sk, &msg, skb);
1170 release_sock(sk);
1171 if (!skb) {
1172 if (np->rxopt.bits.rxinfo) {
1173 struct in6_pktinfo src_info;
1174 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1175 np->sticky_pktinfo.ipi6_ifindex;
1176 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1177 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1178 }
1179 if (np->rxopt.bits.rxhlim) {
1180 int hlim = np->mcast_hops;
1181 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1182 }
1183 if (np->rxopt.bits.rxtclass) {
1184 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1185
1186 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1187 }
1188 if (np->rxopt.bits.rxoinfo) {
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 :
1193 np->sticky_pktinfo.ipi6_addr;
1194 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1195 }
1196 if (np->rxopt.bits.rxohlim) {
1197 int hlim = np->mcast_hops;
1198 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1199 }
1200 if (np->rxopt.bits.rxflow) {
1201 __be32 flowinfo = np->rcv_flowinfo;
1202
1203 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1204 }
1205 }
1206 len -= msg.msg_controllen;
1207 return put_user(len, optlen);
1208 }
1209 case IPV6_MTU:
1210 {
1211 struct dst_entry *dst;
1212
1213 val = 0;
1214 rcu_read_lock();
1215 dst = __sk_dst_get(sk);
1216 if (dst)
1217 val = dst_mtu(dst);
1218 rcu_read_unlock();
1219 if (!val)
1220 return -ENOTCONN;
1221 break;
1222 }
1223
1224 case IPV6_V6ONLY:
1225 val = sk->sk_ipv6only;
1226 break;
1227
1228 case IPV6_RECVPKTINFO:
1229 val = np->rxopt.bits.rxinfo;
1230 break;
1231
1232 case IPV6_2292PKTINFO:
1233 val = np->rxopt.bits.rxoinfo;
1234 break;
1235
1236 case IPV6_RECVHOPLIMIT:
1237 val = np->rxopt.bits.rxhlim;
1238 break;
1239
1240 case IPV6_2292HOPLIMIT:
1241 val = np->rxopt.bits.rxohlim;
1242 break;
1243
1244 case IPV6_RECVRTHDR:
1245 val = np->rxopt.bits.srcrt;
1246 break;
1247
1248 case IPV6_2292RTHDR:
1249 val = np->rxopt.bits.osrcrt;
1250 break;
1251
1252 case IPV6_HOPOPTS:
1253 case IPV6_RTHDRDSTOPTS:
1254 case IPV6_RTHDR:
1255 case IPV6_DSTOPTS:
1256 {
1257 struct ipv6_txoptions *opt;
1258
1259 lock_sock(sk);
1260 opt = rcu_dereference_protected(np->opt,
1261 lockdep_sock_is_held(sk));
1262 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1263 release_sock(sk);
1264 /* check if ipv6_getsockopt_sticky() returns err code */
1265 if (len < 0)
1266 return len;
1267 return put_user(len, optlen);
1268 }
1269
1270 case IPV6_RECVHOPOPTS:
1271 val = np->rxopt.bits.hopopts;
1272 break;
1273
1274 case IPV6_2292HOPOPTS:
1275 val = np->rxopt.bits.ohopopts;
1276 break;
1277
1278 case IPV6_RECVDSTOPTS:
1279 val = np->rxopt.bits.dstopts;
1280 break;
1281
1282 case IPV6_2292DSTOPTS:
1283 val = np->rxopt.bits.odstopts;
1284 break;
1285
1286 case IPV6_TCLASS:
1287 val = np->tclass;
1288 break;
1289
1290 case IPV6_RECVTCLASS:
1291 val = np->rxopt.bits.rxtclass;
1292 break;
1293
1294 case IPV6_FLOWINFO:
1295 val = np->rxopt.bits.rxflow;
1296 break;
1297
1298 case IPV6_RECVPATHMTU:
1299 val = np->rxopt.bits.rxpmtu;
1300 break;
1301
1302 case IPV6_PATHMTU:
1303 {
1304 struct dst_entry *dst;
1305 struct ip6_mtuinfo mtuinfo;
1306
1307 if (len < sizeof(mtuinfo))
1308 return -EINVAL;
1309
1310 len = sizeof(mtuinfo);
1311 memset(&mtuinfo, 0, sizeof(mtuinfo));
1312
1313 rcu_read_lock();
1314 dst = __sk_dst_get(sk);
1315 if (dst)
1316 mtuinfo.ip6m_mtu = dst_mtu(dst);
1317 rcu_read_unlock();
1318 if (!mtuinfo.ip6m_mtu)
1319 return -ENOTCONN;
1320
1321 if (put_user(len, optlen))
1322 return -EFAULT;
1323 if (copy_to_user(optval, &mtuinfo, len))
1324 return -EFAULT;
1325
1326 return 0;
1327 }
1328
1329 case IPV6_TRANSPARENT:
1330 val = inet_sk(sk)->transparent;
1331 break;
1332
1333 case IPV6_FREEBIND:
1334 val = inet_sk(sk)->freebind;
1335 break;
1336
1337 case IPV6_RECVORIGDSTADDR:
1338 val = np->rxopt.bits.rxorigdstaddr;
1339 break;
1340
1341 case IPV6_UNICAST_HOPS:
1342 case IPV6_MULTICAST_HOPS:
1343 {
1344 struct dst_entry *dst;
1345
1346 if (optname == IPV6_UNICAST_HOPS)
1347 val = np->hop_limit;
1348 else
1349 val = np->mcast_hops;
1350
1351 if (val < 0) {
1352 rcu_read_lock();
1353 dst = __sk_dst_get(sk);
1354 if (dst)
1355 val = ip6_dst_hoplimit(dst);
1356 rcu_read_unlock();
1357 }
1358
1359 if (val < 0)
1360 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1361 break;
1362 }
1363
1364 case IPV6_MULTICAST_LOOP:
1365 val = np->mc_loop;
1366 break;
1367
1368 case IPV6_MULTICAST_IF:
1369 val = np->mcast_oif;
1370 break;
1371
1372 case IPV6_MULTICAST_ALL:
1373 val = np->mc_all;
1374 break;
1375
1376 case IPV6_UNICAST_IF:
1377 val = (__force int)htonl((__u32) np->ucast_oif);
1378 break;
1379
1380 case IPV6_MTU_DISCOVER:
1381 val = np->pmtudisc;
1382 break;
1383
1384 case IPV6_RECVERR:
1385 val = np->recverr;
1386 break;
1387
1388 case IPV6_FLOWINFO_SEND:
1389 val = np->sndflow;
1390 break;
1391
1392 case IPV6_FLOWLABEL_MGR:
1393 {
1394 struct in6_flowlabel_req freq;
1395 int flags;
1396
1397 if (len < sizeof(freq))
1398 return -EINVAL;
1399
1400 if (copy_from_user(&freq, optval, sizeof(freq)))
1401 return -EFAULT;
1402
1403 if (freq.flr_action != IPV6_FL_A_GET)
1404 return -EINVAL;
1405
1406 len = sizeof(freq);
1407 flags = freq.flr_flags;
1408
1409 memset(&freq, 0, sizeof(freq));
1410
1411 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1412 if (val < 0)
1413 return val;
1414
1415 if (put_user(len, optlen))
1416 return -EFAULT;
1417 if (copy_to_user(optval, &freq, len))
1418 return -EFAULT;
1419
1420 return 0;
1421 }
1422
1423 case IPV6_ADDR_PREFERENCES:
1424 val = 0;
1425
1426 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1427 val |= IPV6_PREFER_SRC_TMP;
1428 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1429 val |= IPV6_PREFER_SRC_PUBLIC;
1430 else {
1431 /* XXX: should we return system default? */
1432 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1433 }
1434
1435 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1436 val |= IPV6_PREFER_SRC_COA;
1437 else
1438 val |= IPV6_PREFER_SRC_HOME;
1439 break;
1440
1441 case IPV6_MINHOPCOUNT:
1442 val = np->min_hopcount;
1443 break;
1444
1445 case IPV6_DONTFRAG:
1446 val = np->dontfrag;
1447 break;
1448
1449 case IPV6_AUTOFLOWLABEL:
1450 val = ip6_autoflowlabel(sock_net(sk), np);
1451 break;
1452
1453 case IPV6_RECVFRAGSIZE:
1454 val = np->rxopt.bits.recvfragsize;
1455 break;
1456
1457 case IPV6_ROUTER_ALERT_ISOLATE:
1458 val = np->rtalert_isolate;
1459 break;
1460
1461 case IPV6_RECVERR_RFC4884:
1462 val = np->recverr_rfc4884;
1463 break;
1464
1465 default:
1466 return -ENOPROTOOPT;
1467 }
1468 len = min_t(unsigned int, sizeof(int), len);
1469 if (put_user(len, optlen))
1470 return -EFAULT;
1471 if (copy_to_user(optval, &val, len))
1472 return -EFAULT;
1473 return 0;
1474 }
1475
ipv6_getsockopt(struct sock * sk,int level,int optname,char __user * optval,int __user * optlen)1476 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1477 char __user *optval, int __user *optlen)
1478 {
1479 int err;
1480
1481 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1482 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1483
1484 if (level != SOL_IPV6)
1485 return -ENOPROTOOPT;
1486
1487 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1488 #ifdef CONFIG_NETFILTER
1489 /* we need to exclude all possible ENOPROTOOPTs except default case */
1490 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1491 int len;
1492
1493 if (get_user(len, optlen))
1494 return -EFAULT;
1495
1496 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1497 if (err >= 0)
1498 err = put_user(len, optlen);
1499 }
1500 #endif
1501 return err;
1502 }
1503 EXPORT_SYMBOL(ipv6_getsockopt);
1504