1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * IPv6 BSD socket options interface
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 *
9 * Based on linux/net/ipv4/ip_sockglue.c
10 *
11 * FIXME: Make the setsockopt code POSIX compliant: That is
12 *
13 * o Truncate getsockopt returns
14 * o Return an optlen of the truncated length if need be
15 *
16 * Changes:
17 * David L Stevens <dlstevens@us.ibm.com>:
18 * - added multicast source filtering API for MLDv2
19 */
20
21 #include <linux/module.h>
22 #include <linux/capability.h>
23 #include <linux/errno.h>
24 #include <linux/types.h>
25 #include <linux/socket.h>
26 #include <linux/sockios.h>
27 #include <linux/net.h>
28 #include <linux/in6.h>
29 #include <linux/mroute6.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_arp.h>
32 #include <linux/init.h>
33 #include <linux/sysctl.h>
34 #include <linux/netfilter.h>
35 #include <linux/slab.h>
36
37 #include <net/sock.h>
38 #include <net/snmp.h>
39 #include <net/ipv6.h>
40 #include <net/ndisc.h>
41 #include <net/protocol.h>
42 #include <net/transp_v6.h>
43 #include <net/ip6_route.h>
44 #include <net/addrconf.h>
45 #include <net/inet_common.h>
46 #include <net/tcp.h>
47 #include <net/udp.h>
48 #include <net/udplite.h>
49 #include <net/xfrm.h>
50 #include <net/compat.h>
51 #include <net/seg6.h>
52
53 #include <linux/uaccess.h>
54
55 struct ip6_ra_chain *ip6_ra_chain;
56 DEFINE_RWLOCK(ip6_ra_lock);
57
58 DEFINE_STATIC_KEY_FALSE(ip6_min_hopcount);
59
ip6_ra_control(struct sock * sk,int sel)60 int ip6_ra_control(struct sock *sk, int sel)
61 {
62 struct ip6_ra_chain *ra, *new_ra, **rap;
63
64 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
65 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
66 return -ENOPROTOOPT;
67
68 new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
69 if (sel >= 0 && !new_ra)
70 return -ENOMEM;
71
72 write_lock_bh(&ip6_ra_lock);
73 for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
74 if (ra->sk == sk) {
75 if (sel >= 0) {
76 write_unlock_bh(&ip6_ra_lock);
77 kfree(new_ra);
78 return -EADDRINUSE;
79 }
80
81 *rap = ra->next;
82 write_unlock_bh(&ip6_ra_lock);
83
84 sock_put(sk);
85 kfree(ra);
86 return 0;
87 }
88 }
89 if (!new_ra) {
90 write_unlock_bh(&ip6_ra_lock);
91 return -ENOBUFS;
92 }
93 new_ra->sk = sk;
94 new_ra->sel = sel;
95 new_ra->next = ra;
96 *rap = new_ra;
97 sock_hold(sk);
98 write_unlock_bh(&ip6_ra_lock);
99 return 0;
100 }
101
ipv6_update_options(struct sock * sk,struct ipv6_txoptions * opt)102 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
103 struct ipv6_txoptions *opt)
104 {
105 if (inet_sk(sk)->is_icsk) {
106 if (opt &&
107 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
108 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
109 struct inet_connection_sock *icsk = inet_csk(sk);
110 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
111 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
112 }
113 }
114 opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
115 opt);
116 sk_dst_reset(sk);
117
118 return opt;
119 }
120
setsockopt_needs_rtnl(int optname)121 static bool setsockopt_needs_rtnl(int optname)
122 {
123 switch (optname) {
124 case IPV6_ADDRFORM:
125 case IPV6_ADD_MEMBERSHIP:
126 case IPV6_DROP_MEMBERSHIP:
127 case IPV6_JOIN_ANYCAST:
128 case IPV6_LEAVE_ANYCAST:
129 case MCAST_JOIN_GROUP:
130 case MCAST_LEAVE_GROUP:
131 case MCAST_JOIN_SOURCE_GROUP:
132 case MCAST_LEAVE_SOURCE_GROUP:
133 case MCAST_BLOCK_SOURCE:
134 case MCAST_UNBLOCK_SOURCE:
135 case MCAST_MSFILTER:
136 return true;
137 }
138 return false;
139 }
140
copy_group_source_from_sockptr(struct group_source_req * greqs,sockptr_t optval,int optlen)141 static int copy_group_source_from_sockptr(struct group_source_req *greqs,
142 sockptr_t optval, int optlen)
143 {
144 if (in_compat_syscall()) {
145 struct compat_group_source_req gr32;
146
147 if (optlen < sizeof(gr32))
148 return -EINVAL;
149 if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
150 return -EFAULT;
151 greqs->gsr_interface = gr32.gsr_interface;
152 greqs->gsr_group = gr32.gsr_group;
153 greqs->gsr_source = gr32.gsr_source;
154 } else {
155 if (optlen < sizeof(*greqs))
156 return -EINVAL;
157 if (copy_from_sockptr(greqs, optval, sizeof(*greqs)))
158 return -EFAULT;
159 }
160
161 return 0;
162 }
163
do_ipv6_mcast_group_source(struct sock * sk,int optname,sockptr_t optval,int optlen)164 static int do_ipv6_mcast_group_source(struct sock *sk, int optname,
165 sockptr_t optval, int optlen)
166 {
167 struct group_source_req greqs;
168 int omode, add;
169 int ret;
170
171 ret = copy_group_source_from_sockptr(&greqs, optval, optlen);
172 if (ret)
173 return ret;
174
175 if (greqs.gsr_group.ss_family != AF_INET6 ||
176 greqs.gsr_source.ss_family != AF_INET6)
177 return -EADDRNOTAVAIL;
178
179 if (optname == MCAST_BLOCK_SOURCE) {
180 omode = MCAST_EXCLUDE;
181 add = 1;
182 } else if (optname == MCAST_UNBLOCK_SOURCE) {
183 omode = MCAST_EXCLUDE;
184 add = 0;
185 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
186 struct sockaddr_in6 *psin6;
187 int retv;
188
189 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
190 retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
191 &psin6->sin6_addr,
192 MCAST_INCLUDE);
193 /* prior join w/ different source is ok */
194 if (retv && retv != -EADDRINUSE)
195 return retv;
196 omode = MCAST_INCLUDE;
197 add = 1;
198 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
199 omode = MCAST_INCLUDE;
200 add = 0;
201 }
202 return ip6_mc_source(add, omode, sk, &greqs);
203 }
204
ipv6_set_mcast_msfilter(struct sock * sk,sockptr_t optval,int optlen)205 static int ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
206 int optlen)
207 {
208 struct group_filter *gsf;
209 int ret;
210
211 if (optlen < GROUP_FILTER_SIZE(0))
212 return -EINVAL;
213 if (optlen > sysctl_optmem_max)
214 return -ENOBUFS;
215
216 gsf = memdup_sockptr(optval, optlen);
217 if (IS_ERR(gsf))
218 return PTR_ERR(gsf);
219
220 /* numsrc >= (4G-140)/128 overflow in 32 bits */
221 ret = -ENOBUFS;
222 if (gsf->gf_numsrc >= 0x1ffffffU ||
223 gsf->gf_numsrc > sysctl_mld_max_msf)
224 goto out_free_gsf;
225
226 ret = -EINVAL;
227 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen)
228 goto out_free_gsf;
229
230 ret = ip6_mc_msfilter(sk, gsf, gsf->gf_slist_flex);
231 out_free_gsf:
232 kfree(gsf);
233 return ret;
234 }
235
compat_ipv6_set_mcast_msfilter(struct sock * sk,sockptr_t optval,int optlen)236 static int compat_ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
237 int optlen)
238 {
239 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
240 struct compat_group_filter *gf32;
241 void *p;
242 int ret;
243 int n;
244
245 if (optlen < size0)
246 return -EINVAL;
247 if (optlen > sysctl_optmem_max - 4)
248 return -ENOBUFS;
249
250 p = kmalloc(optlen + 4, GFP_KERNEL);
251 if (!p)
252 return -ENOMEM;
253
254 gf32 = p + 4; /* we want ->gf_group and ->gf_slist_flex aligned */
255 ret = -EFAULT;
256 if (copy_from_sockptr(gf32, optval, optlen))
257 goto out_free_p;
258
259 /* numsrc >= (4G-140)/128 overflow in 32 bits */
260 ret = -ENOBUFS;
261 n = gf32->gf_numsrc;
262 if (n >= 0x1ffffffU || n > sysctl_mld_max_msf)
263 goto out_free_p;
264
265 ret = -EINVAL;
266 if (offsetof(struct compat_group_filter, gf_slist_flex[n]) > optlen)
267 goto out_free_p;
268
269 ret = ip6_mc_msfilter(sk, &(struct group_filter){
270 .gf_interface = gf32->gf_interface,
271 .gf_group = gf32->gf_group,
272 .gf_fmode = gf32->gf_fmode,
273 .gf_numsrc = gf32->gf_numsrc}, gf32->gf_slist_flex);
274
275 out_free_p:
276 kfree(p);
277 return ret;
278 }
279
ipv6_mcast_join_leave(struct sock * sk,int optname,sockptr_t optval,int optlen)280 static int ipv6_mcast_join_leave(struct sock *sk, int optname,
281 sockptr_t optval, int optlen)
282 {
283 struct sockaddr_in6 *psin6;
284 struct group_req greq;
285
286 if (optlen < sizeof(greq))
287 return -EINVAL;
288 if (copy_from_sockptr(&greq, optval, sizeof(greq)))
289 return -EFAULT;
290
291 if (greq.gr_group.ss_family != AF_INET6)
292 return -EADDRNOTAVAIL;
293 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
294 if (optname == MCAST_JOIN_GROUP)
295 return ipv6_sock_mc_join(sk, greq.gr_interface,
296 &psin6->sin6_addr);
297 return ipv6_sock_mc_drop(sk, greq.gr_interface, &psin6->sin6_addr);
298 }
299
compat_ipv6_mcast_join_leave(struct sock * sk,int optname,sockptr_t optval,int optlen)300 static int compat_ipv6_mcast_join_leave(struct sock *sk, int optname,
301 sockptr_t optval, int optlen)
302 {
303 struct compat_group_req gr32;
304 struct sockaddr_in6 *psin6;
305
306 if (optlen < sizeof(gr32))
307 return -EINVAL;
308 if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
309 return -EFAULT;
310
311 if (gr32.gr_group.ss_family != AF_INET6)
312 return -EADDRNOTAVAIL;
313 psin6 = (struct sockaddr_in6 *)&gr32.gr_group;
314 if (optname == MCAST_JOIN_GROUP)
315 return ipv6_sock_mc_join(sk, gr32.gr_interface,
316 &psin6->sin6_addr);
317 return ipv6_sock_mc_drop(sk, gr32.gr_interface, &psin6->sin6_addr);
318 }
319
ipv6_set_opt_hdr(struct sock * sk,int optname,sockptr_t optval,int optlen)320 static int ipv6_set_opt_hdr(struct sock *sk, int optname, sockptr_t optval,
321 int optlen)
322 {
323 struct ipv6_pinfo *np = inet6_sk(sk);
324 struct ipv6_opt_hdr *new = NULL;
325 struct net *net = sock_net(sk);
326 struct ipv6_txoptions *opt;
327 int err;
328
329 /* hop-by-hop / destination options are privileged option */
330 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
331 return -EPERM;
332
333 /* remove any sticky options header with a zero option
334 * length, per RFC3542.
335 */
336 if (optlen > 0) {
337 if (sockptr_is_null(optval))
338 return -EINVAL;
339 if (optlen < sizeof(struct ipv6_opt_hdr) ||
340 optlen & 0x7 ||
341 optlen > 8 * 255)
342 return -EINVAL;
343
344 new = memdup_sockptr(optval, optlen);
345 if (IS_ERR(new))
346 return PTR_ERR(new);
347 if (unlikely(ipv6_optlen(new) > optlen)) {
348 kfree(new);
349 return -EINVAL;
350 }
351 }
352
353 opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk));
354 opt = ipv6_renew_options(sk, opt, optname, new);
355 kfree(new);
356 if (IS_ERR(opt))
357 return PTR_ERR(opt);
358
359 /* routing header option needs extra check */
360 err = -EINVAL;
361 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
362 struct ipv6_rt_hdr *rthdr = opt->srcrt;
363 switch (rthdr->type) {
364 #if IS_ENABLED(CONFIG_IPV6_MIP6)
365 case IPV6_SRCRT_TYPE_2:
366 if (rthdr->hdrlen != 2 || rthdr->segments_left != 1)
367 goto sticky_done;
368 break;
369 #endif
370 case IPV6_SRCRT_TYPE_4:
371 {
372 struct ipv6_sr_hdr *srh =
373 (struct ipv6_sr_hdr *)opt->srcrt;
374
375 if (!seg6_validate_srh(srh, optlen, false))
376 goto sticky_done;
377 break;
378 }
379 default:
380 goto sticky_done;
381 }
382 }
383
384 err = 0;
385 opt = ipv6_update_options(sk, opt);
386 sticky_done:
387 if (opt) {
388 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
389 txopt_put(opt);
390 }
391 return err;
392 }
393
do_ipv6_setsockopt(struct sock * sk,int level,int optname,sockptr_t optval,unsigned int optlen)394 static 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 local_bh_disable();
475 sock_prot_inuse_add(net, sk->sk_prot, -1);
476 sock_prot_inuse_add(net, &tcp_prot, 1);
477 local_bh_enable();
478 sk->sk_prot = &tcp_prot;
479 icsk->icsk_af_ops = &ipv4_specific;
480 sk->sk_socket->ops = &inet_stream_ops;
481 sk->sk_family = PF_INET;
482 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
483 } else {
484 struct proto *prot = &udp_prot;
485
486 if (sk->sk_protocol == IPPROTO_UDPLITE)
487 prot = &udplite_prot;
488 local_bh_disable();
489 sock_prot_inuse_add(net, sk->sk_prot, -1);
490 sock_prot_inuse_add(net, prot, 1);
491 local_bh_enable();
492 sk->sk_prot = prot;
493 sk->sk_socket->ops = &inet_dgram_ops;
494 sk->sk_family = PF_INET;
495 }
496 opt = xchg((__force struct ipv6_txoptions **)&np->opt,
497 NULL);
498 if (opt) {
499 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
500 txopt_put(opt);
501 }
502 pktopt = xchg(&np->pktoptions, NULL);
503 kfree_skb(pktopt);
504
505 /*
506 * ... and add it to the refcnt debug socks count
507 * in the new family. -acme
508 */
509 sk_refcnt_debug_inc(sk);
510 module_put(THIS_MODULE);
511 retv = 0;
512 break;
513 }
514 goto e_inval;
515
516 case IPV6_V6ONLY:
517 if (optlen < sizeof(int) ||
518 inet_sk(sk)->inet_num)
519 goto e_inval;
520 sk->sk_ipv6only = valbool;
521 retv = 0;
522 break;
523
524 case IPV6_RECVPKTINFO:
525 if (optlen < sizeof(int))
526 goto e_inval;
527 np->rxopt.bits.rxinfo = valbool;
528 retv = 0;
529 break;
530
531 case IPV6_2292PKTINFO:
532 if (optlen < sizeof(int))
533 goto e_inval;
534 np->rxopt.bits.rxoinfo = valbool;
535 retv = 0;
536 break;
537
538 case IPV6_RECVHOPLIMIT:
539 if (optlen < sizeof(int))
540 goto e_inval;
541 np->rxopt.bits.rxhlim = valbool;
542 retv = 0;
543 break;
544
545 case IPV6_2292HOPLIMIT:
546 if (optlen < sizeof(int))
547 goto e_inval;
548 np->rxopt.bits.rxohlim = valbool;
549 retv = 0;
550 break;
551
552 case IPV6_RECVRTHDR:
553 if (optlen < sizeof(int))
554 goto e_inval;
555 np->rxopt.bits.srcrt = valbool;
556 retv = 0;
557 break;
558
559 case IPV6_2292RTHDR:
560 if (optlen < sizeof(int))
561 goto e_inval;
562 np->rxopt.bits.osrcrt = valbool;
563 retv = 0;
564 break;
565
566 case IPV6_RECVHOPOPTS:
567 if (optlen < sizeof(int))
568 goto e_inval;
569 np->rxopt.bits.hopopts = valbool;
570 retv = 0;
571 break;
572
573 case IPV6_2292HOPOPTS:
574 if (optlen < sizeof(int))
575 goto e_inval;
576 np->rxopt.bits.ohopopts = valbool;
577 retv = 0;
578 break;
579
580 case IPV6_RECVDSTOPTS:
581 if (optlen < sizeof(int))
582 goto e_inval;
583 np->rxopt.bits.dstopts = valbool;
584 retv = 0;
585 break;
586
587 case IPV6_2292DSTOPTS:
588 if (optlen < sizeof(int))
589 goto e_inval;
590 np->rxopt.bits.odstopts = valbool;
591 retv = 0;
592 break;
593
594 case IPV6_TCLASS:
595 if (optlen < sizeof(int))
596 goto e_inval;
597 if (val < -1 || val > 0xff)
598 goto e_inval;
599 /* RFC 3542, 6.5: default traffic class of 0x0 */
600 if (val == -1)
601 val = 0;
602 np->tclass = val;
603 retv = 0;
604 break;
605
606 case IPV6_RECVTCLASS:
607 if (optlen < sizeof(int))
608 goto e_inval;
609 np->rxopt.bits.rxtclass = valbool;
610 retv = 0;
611 break;
612
613 case IPV6_FLOWINFO:
614 if (optlen < sizeof(int))
615 goto e_inval;
616 np->rxopt.bits.rxflow = valbool;
617 retv = 0;
618 break;
619
620 case IPV6_RECVPATHMTU:
621 if (optlen < sizeof(int))
622 goto e_inval;
623 np->rxopt.bits.rxpmtu = valbool;
624 retv = 0;
625 break;
626
627 case IPV6_TRANSPARENT:
628 if (valbool && !ns_capable(net->user_ns, CAP_NET_RAW) &&
629 !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
630 retv = -EPERM;
631 break;
632 }
633 if (optlen < sizeof(int))
634 goto e_inval;
635 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
636 inet_sk(sk)->transparent = valbool;
637 retv = 0;
638 break;
639
640 case IPV6_FREEBIND:
641 if (optlen < sizeof(int))
642 goto e_inval;
643 /* we also don't have a separate freebind bit for IPV6 */
644 inet_sk(sk)->freebind = valbool;
645 retv = 0;
646 break;
647
648 case IPV6_RECVORIGDSTADDR:
649 if (optlen < sizeof(int))
650 goto e_inval;
651 np->rxopt.bits.rxorigdstaddr = valbool;
652 retv = 0;
653 break;
654
655 case IPV6_HOPOPTS:
656 case IPV6_RTHDRDSTOPTS:
657 case IPV6_RTHDR:
658 case IPV6_DSTOPTS:
659 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen);
660 break;
661
662 case IPV6_PKTINFO:
663 {
664 struct in6_pktinfo pkt;
665
666 if (optlen == 0)
667 goto e_inval;
668 else if (optlen < sizeof(struct in6_pktinfo) ||
669 sockptr_is_null(optval))
670 goto e_inval;
671
672 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) {
673 retv = -EFAULT;
674 break;
675 }
676 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
677 goto e_inval;
678
679 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
680 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
681 retv = 0;
682 break;
683 }
684
685 case IPV6_2292PKTOPTIONS:
686 {
687 struct ipv6_txoptions *opt = NULL;
688 struct msghdr msg;
689 struct flowi6 fl6;
690 struct ipcm6_cookie ipc6;
691
692 memset(&fl6, 0, sizeof(fl6));
693 fl6.flowi6_oif = sk->sk_bound_dev_if;
694 fl6.flowi6_mark = sk->sk_mark;
695
696 if (optlen == 0)
697 goto update;
698
699 /* 1K is probably excessive
700 * 1K is surely not enough, 2K per standard header is 16K.
701 */
702 retv = -EINVAL;
703 if (optlen > 64*1024)
704 break;
705
706 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
707 retv = -ENOBUFS;
708 if (!opt)
709 break;
710
711 memset(opt, 0, sizeof(*opt));
712 refcount_set(&opt->refcnt, 1);
713 opt->tot_len = sizeof(*opt) + optlen;
714 retv = -EFAULT;
715 if (copy_from_sockptr(opt + 1, optval, optlen))
716 goto done;
717
718 msg.msg_controllen = optlen;
719 msg.msg_control = (void *)(opt+1);
720 ipc6.opt = opt;
721
722 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
723 if (retv)
724 goto done;
725 update:
726 retv = 0;
727 opt = ipv6_update_options(sk, opt);
728 done:
729 if (opt) {
730 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
731 txopt_put(opt);
732 }
733 break;
734 }
735 case IPV6_UNICAST_HOPS:
736 if (optlen < sizeof(int))
737 goto e_inval;
738 if (val > 255 || val < -1)
739 goto e_inval;
740 np->hop_limit = val;
741 retv = 0;
742 break;
743
744 case IPV6_MULTICAST_HOPS:
745 if (sk->sk_type == SOCK_STREAM)
746 break;
747 if (optlen < sizeof(int))
748 goto e_inval;
749 if (val > 255 || val < -1)
750 goto e_inval;
751 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
752 retv = 0;
753 break;
754
755 case IPV6_MULTICAST_LOOP:
756 if (optlen < sizeof(int))
757 goto e_inval;
758 if (val != valbool)
759 goto e_inval;
760 np->mc_loop = valbool;
761 retv = 0;
762 break;
763
764 case IPV6_UNICAST_IF:
765 {
766 struct net_device *dev = NULL;
767 int ifindex;
768
769 if (optlen != sizeof(int))
770 goto e_inval;
771
772 ifindex = (__force int)ntohl((__force __be32)val);
773 if (ifindex == 0) {
774 np->ucast_oif = 0;
775 retv = 0;
776 break;
777 }
778
779 dev = dev_get_by_index(net, ifindex);
780 retv = -EADDRNOTAVAIL;
781 if (!dev)
782 break;
783 dev_put(dev);
784
785 retv = -EINVAL;
786 if (sk->sk_bound_dev_if)
787 break;
788
789 np->ucast_oif = ifindex;
790 retv = 0;
791 break;
792 }
793
794 case IPV6_MULTICAST_IF:
795 if (sk->sk_type == SOCK_STREAM)
796 break;
797 if (optlen < sizeof(int))
798 goto e_inval;
799
800 if (val) {
801 struct net_device *dev;
802 int midx;
803
804 rcu_read_lock();
805
806 dev = dev_get_by_index_rcu(net, val);
807 if (!dev) {
808 rcu_read_unlock();
809 retv = -ENODEV;
810 break;
811 }
812 midx = l3mdev_master_ifindex_rcu(dev);
813
814 rcu_read_unlock();
815
816 if (sk->sk_bound_dev_if &&
817 sk->sk_bound_dev_if != val &&
818 (!midx || midx != sk->sk_bound_dev_if))
819 goto e_inval;
820 }
821 np->mcast_oif = val;
822 retv = 0;
823 break;
824 case IPV6_ADD_MEMBERSHIP:
825 case IPV6_DROP_MEMBERSHIP:
826 {
827 struct ipv6_mreq mreq;
828
829 if (optlen < sizeof(struct ipv6_mreq))
830 goto e_inval;
831
832 retv = -EPROTO;
833 if (inet_sk(sk)->is_icsk)
834 break;
835
836 retv = -EFAULT;
837 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
838 break;
839
840 if (optname == IPV6_ADD_MEMBERSHIP)
841 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
842 else
843 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
844 break;
845 }
846 case IPV6_JOIN_ANYCAST:
847 case IPV6_LEAVE_ANYCAST:
848 {
849 struct ipv6_mreq mreq;
850
851 if (optlen < sizeof(struct ipv6_mreq))
852 goto e_inval;
853
854 retv = -EFAULT;
855 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
856 break;
857
858 if (optname == IPV6_JOIN_ANYCAST)
859 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
860 else
861 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
862 break;
863 }
864 case IPV6_MULTICAST_ALL:
865 if (optlen < sizeof(int))
866 goto e_inval;
867 np->mc_all = valbool;
868 retv = 0;
869 break;
870
871 case MCAST_JOIN_GROUP:
872 case MCAST_LEAVE_GROUP:
873 if (in_compat_syscall())
874 retv = compat_ipv6_mcast_join_leave(sk, optname, optval,
875 optlen);
876 else
877 retv = ipv6_mcast_join_leave(sk, optname, optval,
878 optlen);
879 break;
880 case MCAST_JOIN_SOURCE_GROUP:
881 case MCAST_LEAVE_SOURCE_GROUP:
882 case MCAST_BLOCK_SOURCE:
883 case MCAST_UNBLOCK_SOURCE:
884 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen);
885 break;
886 case MCAST_MSFILTER:
887 if (in_compat_syscall())
888 retv = compat_ipv6_set_mcast_msfilter(sk, optval,
889 optlen);
890 else
891 retv = ipv6_set_mcast_msfilter(sk, optval, optlen);
892 break;
893 case IPV6_ROUTER_ALERT:
894 if (optlen < sizeof(int))
895 goto e_inval;
896 retv = ip6_ra_control(sk, val);
897 break;
898 case IPV6_ROUTER_ALERT_ISOLATE:
899 if (optlen < sizeof(int))
900 goto e_inval;
901 np->rtalert_isolate = valbool;
902 retv = 0;
903 break;
904 case IPV6_MTU_DISCOVER:
905 if (optlen < sizeof(int))
906 goto e_inval;
907 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
908 goto e_inval;
909 np->pmtudisc = val;
910 retv = 0;
911 break;
912 case IPV6_MTU:
913 if (optlen < sizeof(int))
914 goto e_inval;
915 if (val && val < IPV6_MIN_MTU)
916 goto e_inval;
917 np->frag_size = val;
918 retv = 0;
919 break;
920 case IPV6_RECVERR:
921 if (optlen < sizeof(int))
922 goto e_inval;
923 np->recverr = valbool;
924 if (!val)
925 skb_queue_purge(&sk->sk_error_queue);
926 retv = 0;
927 break;
928 case IPV6_FLOWINFO_SEND:
929 if (optlen < sizeof(int))
930 goto e_inval;
931 np->sndflow = valbool;
932 retv = 0;
933 break;
934 case IPV6_FLOWLABEL_MGR:
935 retv = ipv6_flowlabel_opt(sk, optval, optlen);
936 break;
937 case IPV6_IPSEC_POLICY:
938 case IPV6_XFRM_POLICY:
939 retv = -EPERM;
940 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
941 break;
942 retv = xfrm_user_policy(sk, optname, optval, optlen);
943 break;
944
945 case IPV6_ADDR_PREFERENCES:
946 if (optlen < sizeof(int))
947 goto e_inval;
948 retv = __ip6_sock_set_addr_preferences(sk, val);
949 break;
950 case IPV6_MINHOPCOUNT:
951 if (optlen < sizeof(int))
952 goto e_inval;
953 if (val < 0 || val > 255)
954 goto e_inval;
955
956 if (val)
957 static_branch_enable(&ip6_min_hopcount);
958
959 /* tcp_v6_err() and tcp_v6_rcv() might read min_hopcount
960 * while we are changing it.
961 */
962 WRITE_ONCE(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 release_sock(sk);
989 if (needs_rtnl)
990 rtnl_unlock();
991
992 return retv;
993
994 e_inval:
995 release_sock(sk);
996 if (needs_rtnl)
997 rtnl_unlock();
998 return -EINVAL;
999 }
1000
ipv6_setsockopt(struct sock * sk,int level,int optname,sockptr_t optval,unsigned int optlen)1001 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1002 unsigned int optlen)
1003 {
1004 int err;
1005
1006 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1007 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
1008
1009 if (level != SOL_IPV6)
1010 return -ENOPROTOOPT;
1011
1012 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
1013 #ifdef CONFIG_NETFILTER
1014 /* we need to exclude all possible ENOPROTOOPTs except default case */
1015 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
1016 optname != IPV6_XFRM_POLICY)
1017 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
1018 #endif
1019 return err;
1020 }
1021 EXPORT_SYMBOL(ipv6_setsockopt);
1022
ipv6_getsockopt_sticky(struct sock * sk,struct ipv6_txoptions * opt,int optname,char __user * optval,int len)1023 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
1024 int optname, char __user *optval, int len)
1025 {
1026 struct ipv6_opt_hdr *hdr;
1027
1028 if (!opt)
1029 return 0;
1030
1031 switch (optname) {
1032 case IPV6_HOPOPTS:
1033 hdr = opt->hopopt;
1034 break;
1035 case IPV6_RTHDRDSTOPTS:
1036 hdr = opt->dst0opt;
1037 break;
1038 case IPV6_RTHDR:
1039 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1040 break;
1041 case IPV6_DSTOPTS:
1042 hdr = opt->dst1opt;
1043 break;
1044 default:
1045 return -EINVAL; /* should not happen */
1046 }
1047
1048 if (!hdr)
1049 return 0;
1050
1051 len = min_t(unsigned int, len, ipv6_optlen(hdr));
1052 if (copy_to_user(optval, hdr, len))
1053 return -EFAULT;
1054 return len;
1055 }
1056
ipv6_get_msfilter(struct sock * sk,void __user * optval,int __user * optlen,int len)1057 static int ipv6_get_msfilter(struct sock *sk, void __user *optval,
1058 int __user *optlen, int len)
1059 {
1060 const int size0 = offsetof(struct group_filter, gf_slist_flex);
1061 struct group_filter __user *p = optval;
1062 struct group_filter gsf;
1063 int num;
1064 int err;
1065
1066 if (len < size0)
1067 return -EINVAL;
1068 if (copy_from_user(&gsf, p, size0))
1069 return -EFAULT;
1070 if (gsf.gf_group.ss_family != AF_INET6)
1071 return -EADDRNOTAVAIL;
1072 num = gsf.gf_numsrc;
1073 lock_sock(sk);
1074 err = ip6_mc_msfget(sk, &gsf, p->gf_slist_flex);
1075 if (!err) {
1076 if (num > gsf.gf_numsrc)
1077 num = gsf.gf_numsrc;
1078 if (put_user(GROUP_FILTER_SIZE(num), optlen) ||
1079 copy_to_user(p, &gsf, size0))
1080 err = -EFAULT;
1081 }
1082 release_sock(sk);
1083 return err;
1084 }
1085
compat_ipv6_get_msfilter(struct sock * sk,void __user * optval,int __user * optlen)1086 static int compat_ipv6_get_msfilter(struct sock *sk, void __user *optval,
1087 int __user *optlen)
1088 {
1089 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
1090 struct compat_group_filter __user *p = optval;
1091 struct compat_group_filter gf32;
1092 struct group_filter gf;
1093 int len, err;
1094 int num;
1095
1096 if (get_user(len, optlen))
1097 return -EFAULT;
1098 if (len < size0)
1099 return -EINVAL;
1100
1101 if (copy_from_user(&gf32, p, size0))
1102 return -EFAULT;
1103 gf.gf_interface = gf32.gf_interface;
1104 gf.gf_fmode = gf32.gf_fmode;
1105 num = gf.gf_numsrc = gf32.gf_numsrc;
1106 gf.gf_group = gf32.gf_group;
1107
1108 if (gf.gf_group.ss_family != AF_INET6)
1109 return -EADDRNOTAVAIL;
1110
1111 lock_sock(sk);
1112 err = ip6_mc_msfget(sk, &gf, p->gf_slist_flex);
1113 release_sock(sk);
1114 if (err)
1115 return err;
1116 if (num > gf.gf_numsrc)
1117 num = gf.gf_numsrc;
1118 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32));
1119 if (put_user(len, optlen) ||
1120 put_user(gf.gf_fmode, &p->gf_fmode) ||
1121 put_user(gf.gf_numsrc, &p->gf_numsrc))
1122 return -EFAULT;
1123 return 0;
1124 }
1125
do_ipv6_getsockopt(struct sock * sk,int level,int optname,char __user * optval,int __user * optlen,unsigned int flags)1126 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1127 char __user *optval, int __user *optlen, unsigned int flags)
1128 {
1129 struct ipv6_pinfo *np = inet6_sk(sk);
1130 int len;
1131 int val;
1132
1133 if (ip6_mroute_opt(optname))
1134 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1135
1136 if (get_user(len, optlen))
1137 return -EFAULT;
1138 switch (optname) {
1139 case IPV6_ADDRFORM:
1140 if (sk->sk_protocol != IPPROTO_UDP &&
1141 sk->sk_protocol != IPPROTO_UDPLITE &&
1142 sk->sk_protocol != IPPROTO_TCP)
1143 return -ENOPROTOOPT;
1144 if (sk->sk_state != TCP_ESTABLISHED)
1145 return -ENOTCONN;
1146 val = sk->sk_family;
1147 break;
1148 case MCAST_MSFILTER:
1149 if (in_compat_syscall())
1150 return compat_ipv6_get_msfilter(sk, optval, optlen);
1151 return ipv6_get_msfilter(sk, optval, optlen, len);
1152 case IPV6_2292PKTOPTIONS:
1153 {
1154 struct msghdr msg;
1155 struct sk_buff *skb;
1156
1157 if (sk->sk_type != SOCK_STREAM)
1158 return -ENOPROTOOPT;
1159
1160 msg.msg_control_user = optval;
1161 msg.msg_controllen = len;
1162 msg.msg_flags = flags;
1163 msg.msg_control_is_user = true;
1164
1165 lock_sock(sk);
1166 skb = np->pktoptions;
1167 if (skb)
1168 ip6_datagram_recv_ctl(sk, &msg, skb);
1169 release_sock(sk);
1170 if (!skb) {
1171 if (np->rxopt.bits.rxinfo) {
1172 struct in6_pktinfo src_info;
1173 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1174 np->sticky_pktinfo.ipi6_ifindex;
1175 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1176 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1177 }
1178 if (np->rxopt.bits.rxhlim) {
1179 int hlim = np->mcast_hops;
1180 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1181 }
1182 if (np->rxopt.bits.rxtclass) {
1183 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1184
1185 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1186 }
1187 if (np->rxopt.bits.rxoinfo) {
1188 struct in6_pktinfo src_info;
1189 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1190 np->sticky_pktinfo.ipi6_ifindex;
1191 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1192 np->sticky_pktinfo.ipi6_addr;
1193 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1194 }
1195 if (np->rxopt.bits.rxohlim) {
1196 int hlim = np->mcast_hops;
1197 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1198 }
1199 if (np->rxopt.bits.rxflow) {
1200 __be32 flowinfo = np->rcv_flowinfo;
1201
1202 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1203 }
1204 }
1205 len -= msg.msg_controllen;
1206 return put_user(len, optlen);
1207 }
1208 case IPV6_MTU:
1209 {
1210 struct dst_entry *dst;
1211
1212 val = 0;
1213 rcu_read_lock();
1214 dst = __sk_dst_get(sk);
1215 if (dst)
1216 val = dst_mtu(dst);
1217 rcu_read_unlock();
1218 if (!val)
1219 return -ENOTCONN;
1220 break;
1221 }
1222
1223 case IPV6_V6ONLY:
1224 val = sk->sk_ipv6only;
1225 break;
1226
1227 case IPV6_RECVPKTINFO:
1228 val = np->rxopt.bits.rxinfo;
1229 break;
1230
1231 case IPV6_2292PKTINFO:
1232 val = np->rxopt.bits.rxoinfo;
1233 break;
1234
1235 case IPV6_RECVHOPLIMIT:
1236 val = np->rxopt.bits.rxhlim;
1237 break;
1238
1239 case IPV6_2292HOPLIMIT:
1240 val = np->rxopt.bits.rxohlim;
1241 break;
1242
1243 case IPV6_RECVRTHDR:
1244 val = np->rxopt.bits.srcrt;
1245 break;
1246
1247 case IPV6_2292RTHDR:
1248 val = np->rxopt.bits.osrcrt;
1249 break;
1250
1251 case IPV6_HOPOPTS:
1252 case IPV6_RTHDRDSTOPTS:
1253 case IPV6_RTHDR:
1254 case IPV6_DSTOPTS:
1255 {
1256 struct ipv6_txoptions *opt;
1257
1258 lock_sock(sk);
1259 opt = rcu_dereference_protected(np->opt,
1260 lockdep_sock_is_held(sk));
1261 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1262 release_sock(sk);
1263 /* check if ipv6_getsockopt_sticky() returns err code */
1264 if (len < 0)
1265 return len;
1266 return put_user(len, optlen);
1267 }
1268
1269 case IPV6_RECVHOPOPTS:
1270 val = np->rxopt.bits.hopopts;
1271 break;
1272
1273 case IPV6_2292HOPOPTS:
1274 val = np->rxopt.bits.ohopopts;
1275 break;
1276
1277 case IPV6_RECVDSTOPTS:
1278 val = np->rxopt.bits.dstopts;
1279 break;
1280
1281 case IPV6_2292DSTOPTS:
1282 val = np->rxopt.bits.odstopts;
1283 break;
1284
1285 case IPV6_TCLASS:
1286 val = np->tclass;
1287 break;
1288
1289 case IPV6_RECVTCLASS:
1290 val = np->rxopt.bits.rxtclass;
1291 break;
1292
1293 case IPV6_FLOWINFO:
1294 val = np->rxopt.bits.rxflow;
1295 break;
1296
1297 case IPV6_RECVPATHMTU:
1298 val = np->rxopt.bits.rxpmtu;
1299 break;
1300
1301 case IPV6_PATHMTU:
1302 {
1303 struct dst_entry *dst;
1304 struct ip6_mtuinfo mtuinfo;
1305
1306 if (len < sizeof(mtuinfo))
1307 return -EINVAL;
1308
1309 len = sizeof(mtuinfo);
1310 memset(&mtuinfo, 0, sizeof(mtuinfo));
1311
1312 rcu_read_lock();
1313 dst = __sk_dst_get(sk);
1314 if (dst)
1315 mtuinfo.ip6m_mtu = dst_mtu(dst);
1316 rcu_read_unlock();
1317 if (!mtuinfo.ip6m_mtu)
1318 return -ENOTCONN;
1319
1320 if (put_user(len, optlen))
1321 return -EFAULT;
1322 if (copy_to_user(optval, &mtuinfo, len))
1323 return -EFAULT;
1324
1325 return 0;
1326 }
1327
1328 case IPV6_TRANSPARENT:
1329 val = inet_sk(sk)->transparent;
1330 break;
1331
1332 case IPV6_FREEBIND:
1333 val = inet_sk(sk)->freebind;
1334 break;
1335
1336 case IPV6_RECVORIGDSTADDR:
1337 val = np->rxopt.bits.rxorigdstaddr;
1338 break;
1339
1340 case IPV6_UNICAST_HOPS:
1341 case IPV6_MULTICAST_HOPS:
1342 {
1343 struct dst_entry *dst;
1344
1345 if (optname == IPV6_UNICAST_HOPS)
1346 val = np->hop_limit;
1347 else
1348 val = np->mcast_hops;
1349
1350 if (val < 0) {
1351 rcu_read_lock();
1352 dst = __sk_dst_get(sk);
1353 if (dst)
1354 val = ip6_dst_hoplimit(dst);
1355 rcu_read_unlock();
1356 }
1357
1358 if (val < 0)
1359 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1360 break;
1361 }
1362
1363 case IPV6_MULTICAST_LOOP:
1364 val = np->mc_loop;
1365 break;
1366
1367 case IPV6_MULTICAST_IF:
1368 val = np->mcast_oif;
1369 break;
1370
1371 case IPV6_MULTICAST_ALL:
1372 val = np->mc_all;
1373 break;
1374
1375 case IPV6_UNICAST_IF:
1376 val = (__force int)htonl((__u32) np->ucast_oif);
1377 break;
1378
1379 case IPV6_MTU_DISCOVER:
1380 val = np->pmtudisc;
1381 break;
1382
1383 case IPV6_RECVERR:
1384 val = np->recverr;
1385 break;
1386
1387 case IPV6_FLOWINFO_SEND:
1388 val = np->sndflow;
1389 break;
1390
1391 case IPV6_FLOWLABEL_MGR:
1392 {
1393 struct in6_flowlabel_req freq;
1394 int flags;
1395
1396 if (len < sizeof(freq))
1397 return -EINVAL;
1398
1399 if (copy_from_user(&freq, optval, sizeof(freq)))
1400 return -EFAULT;
1401
1402 if (freq.flr_action != IPV6_FL_A_GET)
1403 return -EINVAL;
1404
1405 len = sizeof(freq);
1406 flags = freq.flr_flags;
1407
1408 memset(&freq, 0, sizeof(freq));
1409
1410 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1411 if (val < 0)
1412 return val;
1413
1414 if (put_user(len, optlen))
1415 return -EFAULT;
1416 if (copy_to_user(optval, &freq, len))
1417 return -EFAULT;
1418
1419 return 0;
1420 }
1421
1422 case IPV6_ADDR_PREFERENCES:
1423 val = 0;
1424
1425 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1426 val |= IPV6_PREFER_SRC_TMP;
1427 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1428 val |= IPV6_PREFER_SRC_PUBLIC;
1429 else {
1430 /* XXX: should we return system default? */
1431 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1432 }
1433
1434 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1435 val |= IPV6_PREFER_SRC_COA;
1436 else
1437 val |= IPV6_PREFER_SRC_HOME;
1438 break;
1439
1440 case IPV6_MINHOPCOUNT:
1441 val = np->min_hopcount;
1442 break;
1443
1444 case IPV6_DONTFRAG:
1445 val = np->dontfrag;
1446 break;
1447
1448 case IPV6_AUTOFLOWLABEL:
1449 val = ip6_autoflowlabel(sock_net(sk), np);
1450 break;
1451
1452 case IPV6_RECVFRAGSIZE:
1453 val = np->rxopt.bits.recvfragsize;
1454 break;
1455
1456 case IPV6_ROUTER_ALERT_ISOLATE:
1457 val = np->rtalert_isolate;
1458 break;
1459
1460 case IPV6_RECVERR_RFC4884:
1461 val = np->recverr_rfc4884;
1462 break;
1463
1464 default:
1465 return -ENOPROTOOPT;
1466 }
1467 len = min_t(unsigned int, sizeof(int), len);
1468 if (put_user(len, optlen))
1469 return -EFAULT;
1470 if (copy_to_user(optval, &val, len))
1471 return -EFAULT;
1472 return 0;
1473 }
1474
ipv6_getsockopt(struct sock * sk,int level,int optname,char __user * optval,int __user * optlen)1475 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1476 char __user *optval, int __user *optlen)
1477 {
1478 int err;
1479
1480 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1481 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1482
1483 if (level != SOL_IPV6)
1484 return -ENOPROTOOPT;
1485
1486 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1487 #ifdef CONFIG_NETFILTER
1488 /* we need to exclude all possible ENOPROTOOPTs except default case */
1489 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1490 int len;
1491
1492 if (get_user(len, optlen))
1493 return -EFAULT;
1494
1495 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1496 if (err >= 0)
1497 err = put_user(len, optlen);
1498 }
1499 #endif
1500 return err;
1501 }
1502 EXPORT_SYMBOL(ipv6_getsockopt);
1503