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_test_bit(IS_ICSK, sk)) {
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 = unrcu_pointer(xchg(&inet6_sk(sk)->opt, RCU_INITIALIZER(opt)));
115 sk_dst_reset(sk);
116
117 return opt;
118 }
119
copy_group_source_from_sockptr(struct group_source_req * greqs,sockptr_t optval,int optlen)120 static int copy_group_source_from_sockptr(struct group_source_req *greqs,
121 sockptr_t optval, int optlen)
122 {
123 if (in_compat_syscall()) {
124 struct compat_group_source_req gr32;
125
126 if (optlen < sizeof(gr32))
127 return -EINVAL;
128 if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
129 return -EFAULT;
130 greqs->gsr_interface = gr32.gsr_interface;
131 greqs->gsr_group = gr32.gsr_group;
132 greqs->gsr_source = gr32.gsr_source;
133 } else {
134 if (optlen < sizeof(*greqs))
135 return -EINVAL;
136 if (copy_from_sockptr(greqs, optval, sizeof(*greqs)))
137 return -EFAULT;
138 }
139
140 return 0;
141 }
142
do_ipv6_mcast_group_source(struct sock * sk,int optname,sockptr_t optval,int optlen)143 static int do_ipv6_mcast_group_source(struct sock *sk, int optname,
144 sockptr_t optval, int optlen)
145 {
146 struct group_source_req greqs;
147 int omode, add;
148 int ret;
149
150 ret = copy_group_source_from_sockptr(&greqs, optval, optlen);
151 if (ret)
152 return ret;
153
154 if (greqs.gsr_group.ss_family != AF_INET6 ||
155 greqs.gsr_source.ss_family != AF_INET6)
156 return -EADDRNOTAVAIL;
157
158 if (optname == MCAST_BLOCK_SOURCE) {
159 omode = MCAST_EXCLUDE;
160 add = 1;
161 } else if (optname == MCAST_UNBLOCK_SOURCE) {
162 omode = MCAST_EXCLUDE;
163 add = 0;
164 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
165 struct sockaddr_in6 *psin6;
166 int retv;
167
168 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
169 retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
170 &psin6->sin6_addr,
171 MCAST_INCLUDE);
172 /* prior join w/ different source is ok */
173 if (retv && retv != -EADDRINUSE)
174 return retv;
175 omode = MCAST_INCLUDE;
176 add = 1;
177 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
178 omode = MCAST_INCLUDE;
179 add = 0;
180 }
181 return ip6_mc_source(add, omode, sk, &greqs);
182 }
183
ipv6_set_mcast_msfilter(struct sock * sk,sockptr_t optval,int optlen)184 static int ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
185 int optlen)
186 {
187 struct group_filter *gsf;
188 int ret;
189
190 if (optlen < GROUP_FILTER_SIZE(0))
191 return -EINVAL;
192 if (optlen > READ_ONCE(sock_net(sk)->core.sysctl_optmem_max))
193 return -ENOBUFS;
194
195 gsf = memdup_sockptr(optval, optlen);
196 if (IS_ERR(gsf))
197 return PTR_ERR(gsf);
198
199 /* numsrc >= (4G-140)/128 overflow in 32 bits */
200 ret = -ENOBUFS;
201 if (gsf->gf_numsrc >= 0x1ffffffU ||
202 gsf->gf_numsrc > sysctl_mld_max_msf)
203 goto out_free_gsf;
204
205 ret = -EINVAL;
206 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen)
207 goto out_free_gsf;
208
209 ret = ip6_mc_msfilter(sk, gsf, gsf->gf_slist_flex);
210 out_free_gsf:
211 kfree(gsf);
212 return ret;
213 }
214
compat_ipv6_set_mcast_msfilter(struct sock * sk,sockptr_t optval,int optlen)215 static int compat_ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
216 int optlen)
217 {
218 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
219 struct compat_group_filter *gf32;
220 void *p;
221 int ret;
222 int n;
223
224 if (optlen < size0)
225 return -EINVAL;
226 if (optlen > READ_ONCE(sock_net(sk)->core.sysctl_optmem_max) - 4)
227 return -ENOBUFS;
228
229 p = kmalloc(optlen + 4, GFP_KERNEL);
230 if (!p)
231 return -ENOMEM;
232
233 gf32 = p + 4; /* we want ->gf_group and ->gf_slist_flex aligned */
234 ret = -EFAULT;
235 if (copy_from_sockptr(gf32, optval, optlen))
236 goto out_free_p;
237
238 /* numsrc >= (4G-140)/128 overflow in 32 bits */
239 ret = -ENOBUFS;
240 n = gf32->gf_numsrc;
241 if (n >= 0x1ffffffU || n > sysctl_mld_max_msf)
242 goto out_free_p;
243
244 ret = -EINVAL;
245 if (offsetof(struct compat_group_filter, gf_slist_flex[n]) > optlen)
246 goto out_free_p;
247
248 ret = ip6_mc_msfilter(sk, &(struct group_filter){
249 .gf_interface = gf32->gf_interface,
250 .gf_group = gf32->gf_group,
251 .gf_fmode = gf32->gf_fmode,
252 .gf_numsrc = gf32->gf_numsrc}, gf32->gf_slist_flex);
253
254 out_free_p:
255 kfree(p);
256 return ret;
257 }
258
ipv6_mcast_join_leave(struct sock * sk,int optname,sockptr_t optval,int optlen)259 static int ipv6_mcast_join_leave(struct sock *sk, int optname,
260 sockptr_t optval, int optlen)
261 {
262 struct sockaddr_in6 *psin6;
263 struct group_req greq;
264
265 if (optlen < sizeof(greq))
266 return -EINVAL;
267 if (copy_from_sockptr(&greq, optval, sizeof(greq)))
268 return -EFAULT;
269
270 if (greq.gr_group.ss_family != AF_INET6)
271 return -EADDRNOTAVAIL;
272 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
273 if (optname == MCAST_JOIN_GROUP)
274 return ipv6_sock_mc_join(sk, greq.gr_interface,
275 &psin6->sin6_addr);
276 return ipv6_sock_mc_drop(sk, greq.gr_interface, &psin6->sin6_addr);
277 }
278
compat_ipv6_mcast_join_leave(struct sock * sk,int optname,sockptr_t optval,int optlen)279 static int compat_ipv6_mcast_join_leave(struct sock *sk, int optname,
280 sockptr_t optval, int optlen)
281 {
282 struct compat_group_req gr32;
283 struct sockaddr_in6 *psin6;
284
285 if (optlen < sizeof(gr32))
286 return -EINVAL;
287 if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
288 return -EFAULT;
289
290 if (gr32.gr_group.ss_family != AF_INET6)
291 return -EADDRNOTAVAIL;
292 psin6 = (struct sockaddr_in6 *)&gr32.gr_group;
293 if (optname == MCAST_JOIN_GROUP)
294 return ipv6_sock_mc_join(sk, gr32.gr_interface,
295 &psin6->sin6_addr);
296 return ipv6_sock_mc_drop(sk, gr32.gr_interface, &psin6->sin6_addr);
297 }
298
ipv6_set_opt_hdr(struct sock * sk,int optname,sockptr_t optval,int optlen)299 static int ipv6_set_opt_hdr(struct sock *sk, int optname, sockptr_t optval,
300 int optlen)
301 {
302 struct ipv6_pinfo *np = inet6_sk(sk);
303 struct ipv6_opt_hdr *new = NULL;
304 struct net *net = sock_net(sk);
305 struct ipv6_txoptions *opt;
306 int err;
307
308 /* hop-by-hop / destination options are privileged option */
309 if (optname != IPV6_RTHDR && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW))
310 return -EPERM;
311
312 /* remove any sticky options header with a zero option
313 * length, per RFC3542.
314 */
315 if (optlen > 0) {
316 if (sockptr_is_null(optval))
317 return -EINVAL;
318 if (optlen < sizeof(struct ipv6_opt_hdr) ||
319 optlen & 0x7 ||
320 optlen > 8 * 255)
321 return -EINVAL;
322
323 new = memdup_sockptr(optval, optlen);
324 if (IS_ERR(new))
325 return PTR_ERR(new);
326 if (unlikely(ipv6_optlen(new) > optlen)) {
327 kfree(new);
328 return -EINVAL;
329 }
330 }
331
332 opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk));
333 opt = ipv6_renew_options(sk, opt, optname, new);
334 kfree(new);
335 if (IS_ERR(opt))
336 return PTR_ERR(opt);
337
338 /* routing header option needs extra check */
339 err = -EINVAL;
340 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
341 struct ipv6_rt_hdr *rthdr = opt->srcrt;
342 switch (rthdr->type) {
343 #if IS_ENABLED(CONFIG_IPV6_MIP6)
344 case IPV6_SRCRT_TYPE_2:
345 if (rthdr->hdrlen != 2 || rthdr->segments_left != 1)
346 goto sticky_done;
347 break;
348 #endif
349 case IPV6_SRCRT_TYPE_4:
350 {
351 struct ipv6_sr_hdr *srh =
352 (struct ipv6_sr_hdr *)opt->srcrt;
353
354 if (!seg6_validate_srh(srh, optlen, false))
355 goto sticky_done;
356 break;
357 }
358 default:
359 goto sticky_done;
360 }
361 }
362
363 err = 0;
364 opt = ipv6_update_options(sk, opt);
365 sticky_done:
366 if (opt) {
367 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
368 txopt_put(opt);
369 }
370 return err;
371 }
372
do_ipv6_setsockopt(struct sock * sk,int level,int optname,sockptr_t optval,unsigned int optlen)373 int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
374 sockptr_t optval, unsigned int optlen)
375 {
376 struct ipv6_pinfo *np = inet6_sk(sk);
377 struct net *net = sock_net(sk);
378 int retv = -ENOPROTOOPT;
379 int val, valbool;
380
381 if (sockptr_is_null(optval))
382 val = 0;
383 else {
384 if (optlen >= sizeof(int)) {
385 if (copy_from_sockptr(&val, optval, sizeof(val)))
386 return -EFAULT;
387 } else
388 val = 0;
389 }
390
391 valbool = (val != 0);
392
393 if (ip6_mroute_opt(optname))
394 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
395
396 /* Handle options that can be set without locking the socket. */
397 switch (optname) {
398 case IPV6_UNICAST_HOPS:
399 if (optlen < sizeof(int))
400 return -EINVAL;
401 if (val > 255 || val < -1)
402 return -EINVAL;
403 WRITE_ONCE(np->hop_limit, val);
404 return 0;
405 case IPV6_MULTICAST_LOOP:
406 if (optlen < sizeof(int))
407 return -EINVAL;
408 if (val != valbool)
409 return -EINVAL;
410 inet6_assign_bit(MC6_LOOP, sk, valbool);
411 return 0;
412 case IPV6_MULTICAST_HOPS:
413 if (sk->sk_type == SOCK_STREAM)
414 return retv;
415 if (optlen < sizeof(int))
416 return -EINVAL;
417 if (val > 255 || val < -1)
418 return -EINVAL;
419 WRITE_ONCE(np->mcast_hops,
420 val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
421 return 0;
422 case IPV6_MTU:
423 if (optlen < sizeof(int))
424 return -EINVAL;
425 if (val && val < IPV6_MIN_MTU)
426 return -EINVAL;
427 WRITE_ONCE(np->frag_size, val);
428 return 0;
429 case IPV6_MINHOPCOUNT:
430 if (optlen < sizeof(int))
431 return -EINVAL;
432 if (val < 0 || val > 255)
433 return -EINVAL;
434
435 if (val)
436 static_branch_enable(&ip6_min_hopcount);
437
438 /* tcp_v6_err() and tcp_v6_rcv() might read min_hopcount
439 * while we are changing it.
440 */
441 WRITE_ONCE(np->min_hopcount, val);
442 return 0;
443 case IPV6_RECVERR_RFC4884:
444 if (optlen < sizeof(int))
445 return -EINVAL;
446 if (val < 0 || val > 1)
447 return -EINVAL;
448 inet6_assign_bit(RECVERR6_RFC4884, sk, valbool);
449 return 0;
450 case IPV6_MULTICAST_ALL:
451 if (optlen < sizeof(int))
452 return -EINVAL;
453 inet6_assign_bit(MC6_ALL, sk, valbool);
454 return 0;
455 case IPV6_AUTOFLOWLABEL:
456 inet6_assign_bit(AUTOFLOWLABEL, sk, valbool);
457 inet6_set_bit(AUTOFLOWLABEL_SET, sk);
458 return 0;
459 case IPV6_DONTFRAG:
460 inet6_assign_bit(DONTFRAG, sk, valbool);
461 return 0;
462 case IPV6_RECVERR:
463 if (optlen < sizeof(int))
464 return -EINVAL;
465 inet6_assign_bit(RECVERR6, sk, valbool);
466 if (!val)
467 skb_errqueue_purge(&sk->sk_error_queue);
468 return 0;
469 case IPV6_ROUTER_ALERT_ISOLATE:
470 if (optlen < sizeof(int))
471 return -EINVAL;
472 inet6_assign_bit(RTALERT_ISOLATE, sk, valbool);
473 return 0;
474 case IPV6_MTU_DISCOVER:
475 if (optlen < sizeof(int))
476 return -EINVAL;
477 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
478 return -EINVAL;
479 WRITE_ONCE(np->pmtudisc, val);
480 return 0;
481 case IPV6_FLOWINFO_SEND:
482 if (optlen < sizeof(int))
483 return -EINVAL;
484 inet6_assign_bit(SNDFLOW, sk, valbool);
485 return 0;
486 case IPV6_ADDR_PREFERENCES:
487 if (optlen < sizeof(int))
488 return -EINVAL;
489 return ip6_sock_set_addr_preferences(sk, val);
490 case IPV6_MULTICAST_IF:
491 if (sk->sk_type == SOCK_STREAM)
492 return -ENOPROTOOPT;
493 if (optlen < sizeof(int))
494 return -EINVAL;
495 if (val) {
496 struct net_device *dev;
497 int bound_dev_if, midx;
498
499 rcu_read_lock();
500
501 dev = dev_get_by_index_rcu(net, val);
502 if (!dev) {
503 rcu_read_unlock();
504 return -ENODEV;
505 }
506 midx = l3mdev_master_ifindex_rcu(dev);
507
508 rcu_read_unlock();
509
510 bound_dev_if = READ_ONCE(sk->sk_bound_dev_if);
511 if (bound_dev_if &&
512 bound_dev_if != val &&
513 (!midx || midx != bound_dev_if))
514 return -EINVAL;
515 }
516 WRITE_ONCE(np->mcast_oif, val);
517 return 0;
518 case IPV6_UNICAST_IF:
519 {
520 struct net_device *dev;
521 int ifindex;
522
523 if (optlen != sizeof(int))
524 return -EINVAL;
525
526 ifindex = (__force int)ntohl((__force __be32)val);
527 if (!ifindex) {
528 WRITE_ONCE(np->ucast_oif, 0);
529 return 0;
530 }
531
532 dev = dev_get_by_index(net, ifindex);
533 if (!dev)
534 return -EADDRNOTAVAIL;
535 dev_put(dev);
536
537 if (READ_ONCE(sk->sk_bound_dev_if))
538 return -EINVAL;
539
540 WRITE_ONCE(np->ucast_oif, ifindex);
541 return 0;
542 }
543 }
544
545 sockopt_lock_sock(sk);
546
547 /* Another thread has converted the socket into IPv4 with
548 * IPV6_ADDRFORM concurrently.
549 */
550 if (unlikely(sk->sk_family != AF_INET6))
551 goto unlock;
552
553 switch (optname) {
554
555 case IPV6_ADDRFORM:
556 if (optlen < sizeof(int))
557 goto e_inval;
558 if (val == PF_INET) {
559 if (sk->sk_type == SOCK_RAW)
560 break;
561
562 if (sk->sk_protocol == IPPROTO_UDP ||
563 sk->sk_protocol == IPPROTO_UDPLITE) {
564 struct udp_sock *up = udp_sk(sk);
565 if (up->pending == AF_INET6) {
566 retv = -EBUSY;
567 break;
568 }
569 } else if (sk->sk_protocol == IPPROTO_TCP) {
570 if (sk->sk_prot != &tcpv6_prot) {
571 retv = -EBUSY;
572 break;
573 }
574 } else {
575 break;
576 }
577
578 if (sk->sk_state != TCP_ESTABLISHED) {
579 retv = -ENOTCONN;
580 break;
581 }
582
583 if (ipv6_only_sock(sk) ||
584 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
585 retv = -EADDRNOTAVAIL;
586 break;
587 }
588
589 __ipv6_sock_mc_close(sk);
590 __ipv6_sock_ac_close(sk);
591
592 if (sk->sk_protocol == IPPROTO_TCP) {
593 struct inet_connection_sock *icsk = inet_csk(sk);
594
595 sock_prot_inuse_add(net, sk->sk_prot, -1);
596 sock_prot_inuse_add(net, &tcp_prot, 1);
597
598 /* Paired with READ_ONCE(sk->sk_prot) in inet6_stream_ops */
599 WRITE_ONCE(sk->sk_prot, &tcp_prot);
600 /* Paired with READ_ONCE() in tcp_(get|set)sockopt() */
601 WRITE_ONCE(icsk->icsk_af_ops, &ipv4_specific);
602 WRITE_ONCE(sk->sk_socket->ops, &inet_stream_ops);
603 WRITE_ONCE(sk->sk_family, PF_INET);
604 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
605 } else {
606 struct proto *prot = &udp_prot;
607
608 if (sk->sk_protocol == IPPROTO_UDPLITE)
609 prot = &udplite_prot;
610
611 sock_prot_inuse_add(net, sk->sk_prot, -1);
612 sock_prot_inuse_add(net, prot, 1);
613
614 /* Paired with READ_ONCE(sk->sk_prot) in inet6_dgram_ops */
615 WRITE_ONCE(sk->sk_prot, prot);
616 WRITE_ONCE(sk->sk_socket->ops, &inet_dgram_ops);
617 WRITE_ONCE(sk->sk_family, PF_INET);
618 }
619
620 /* Disable all options not to allocate memory anymore,
621 * but there is still a race. See the lockless path
622 * in udpv6_sendmsg() and ipv6_local_rxpmtu().
623 */
624 np->rxopt.all = 0;
625
626 inet6_cleanup_sock(sk);
627
628 module_put(THIS_MODULE);
629 retv = 0;
630 break;
631 }
632 goto e_inval;
633
634 case IPV6_V6ONLY:
635 if (optlen < sizeof(int) ||
636 inet_sk(sk)->inet_num)
637 goto e_inval;
638 sk->sk_ipv6only = valbool;
639 retv = 0;
640 break;
641
642 case IPV6_RECVPKTINFO:
643 if (optlen < sizeof(int))
644 goto e_inval;
645 np->rxopt.bits.rxinfo = valbool;
646 retv = 0;
647 break;
648
649 case IPV6_2292PKTINFO:
650 if (optlen < sizeof(int))
651 goto e_inval;
652 np->rxopt.bits.rxoinfo = valbool;
653 retv = 0;
654 break;
655
656 case IPV6_RECVHOPLIMIT:
657 if (optlen < sizeof(int))
658 goto e_inval;
659 np->rxopt.bits.rxhlim = valbool;
660 retv = 0;
661 break;
662
663 case IPV6_2292HOPLIMIT:
664 if (optlen < sizeof(int))
665 goto e_inval;
666 np->rxopt.bits.rxohlim = valbool;
667 retv = 0;
668 break;
669
670 case IPV6_RECVRTHDR:
671 if (optlen < sizeof(int))
672 goto e_inval;
673 np->rxopt.bits.srcrt = valbool;
674 retv = 0;
675 break;
676
677 case IPV6_2292RTHDR:
678 if (optlen < sizeof(int))
679 goto e_inval;
680 np->rxopt.bits.osrcrt = valbool;
681 retv = 0;
682 break;
683
684 case IPV6_RECVHOPOPTS:
685 if (optlen < sizeof(int))
686 goto e_inval;
687 np->rxopt.bits.hopopts = valbool;
688 retv = 0;
689 break;
690
691 case IPV6_2292HOPOPTS:
692 if (optlen < sizeof(int))
693 goto e_inval;
694 np->rxopt.bits.ohopopts = valbool;
695 retv = 0;
696 break;
697
698 case IPV6_RECVDSTOPTS:
699 if (optlen < sizeof(int))
700 goto e_inval;
701 np->rxopt.bits.dstopts = valbool;
702 retv = 0;
703 break;
704
705 case IPV6_2292DSTOPTS:
706 if (optlen < sizeof(int))
707 goto e_inval;
708 np->rxopt.bits.odstopts = valbool;
709 retv = 0;
710 break;
711
712 case IPV6_TCLASS:
713 if (optlen < sizeof(int))
714 goto e_inval;
715 if (val < -1 || val > 0xff)
716 goto e_inval;
717 /* RFC 3542, 6.5: default traffic class of 0x0 */
718 if (val == -1)
719 val = 0;
720 if (sk->sk_type == SOCK_STREAM) {
721 val &= ~INET_ECN_MASK;
722 val |= np->tclass & INET_ECN_MASK;
723 }
724 if (np->tclass != val) {
725 np->tclass = val;
726 sk_dst_reset(sk);
727 }
728 retv = 0;
729 break;
730
731 case IPV6_RECVTCLASS:
732 if (optlen < sizeof(int))
733 goto e_inval;
734 np->rxopt.bits.rxtclass = valbool;
735 retv = 0;
736 break;
737
738 case IPV6_FLOWINFO:
739 if (optlen < sizeof(int))
740 goto e_inval;
741 np->rxopt.bits.rxflow = valbool;
742 retv = 0;
743 break;
744
745 case IPV6_RECVPATHMTU:
746 if (optlen < sizeof(int))
747 goto e_inval;
748 np->rxopt.bits.rxpmtu = valbool;
749 retv = 0;
750 break;
751
752 case IPV6_TRANSPARENT:
753 if (valbool && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW) &&
754 !sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) {
755 retv = -EPERM;
756 break;
757 }
758 if (optlen < sizeof(int))
759 goto e_inval;
760 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
761 inet_assign_bit(TRANSPARENT, sk, valbool);
762 retv = 0;
763 break;
764
765 case IPV6_FREEBIND:
766 if (optlen < sizeof(int))
767 goto e_inval;
768 /* we also don't have a separate freebind bit for IPV6 */
769 inet_assign_bit(FREEBIND, sk, valbool);
770 retv = 0;
771 break;
772
773 case IPV6_RECVORIGDSTADDR:
774 if (optlen < sizeof(int))
775 goto e_inval;
776 np->rxopt.bits.rxorigdstaddr = valbool;
777 retv = 0;
778 break;
779
780 case IPV6_HOPOPTS:
781 case IPV6_RTHDRDSTOPTS:
782 case IPV6_RTHDR:
783 case IPV6_DSTOPTS:
784 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen);
785 break;
786
787 case IPV6_PKTINFO:
788 {
789 struct in6_pktinfo pkt;
790
791 if (optlen == 0)
792 goto e_inval;
793 else if (optlen < sizeof(struct in6_pktinfo) ||
794 sockptr_is_null(optval))
795 goto e_inval;
796
797 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) {
798 retv = -EFAULT;
799 break;
800 }
801 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
802 goto e_inval;
803
804 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
805 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
806 retv = 0;
807 break;
808 }
809
810 case IPV6_2292PKTOPTIONS:
811 {
812 struct ipv6_txoptions *opt = NULL;
813 struct msghdr msg;
814 struct flowi6 fl6;
815 struct ipcm6_cookie ipc6;
816
817 memset(&fl6, 0, sizeof(fl6));
818 fl6.flowi6_oif = sk->sk_bound_dev_if;
819 fl6.flowi6_mark = sk->sk_mark;
820
821 if (optlen == 0)
822 goto update;
823
824 /* 1K is probably excessive
825 * 1K is surely not enough, 2K per standard header is 16K.
826 */
827 retv = -EINVAL;
828 if (optlen > 64*1024)
829 break;
830
831 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
832 retv = -ENOBUFS;
833 if (!opt)
834 break;
835
836 memset(opt, 0, sizeof(*opt));
837 refcount_set(&opt->refcnt, 1);
838 opt->tot_len = sizeof(*opt) + optlen;
839 retv = -EFAULT;
840 if (copy_from_sockptr(opt + 1, optval, optlen))
841 goto done;
842
843 msg.msg_controllen = optlen;
844 msg.msg_control_is_user = false;
845 msg.msg_control = (void *)(opt+1);
846 ipc6.opt = opt;
847
848 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
849 if (retv)
850 goto done;
851 update:
852 retv = 0;
853 opt = ipv6_update_options(sk, opt);
854 done:
855 if (opt) {
856 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
857 txopt_put(opt);
858 }
859 break;
860 }
861
862 case IPV6_ADD_MEMBERSHIP:
863 case IPV6_DROP_MEMBERSHIP:
864 {
865 struct ipv6_mreq mreq;
866
867 if (optlen < sizeof(struct ipv6_mreq))
868 goto e_inval;
869
870 retv = -EPROTO;
871 if (inet_test_bit(IS_ICSK, sk))
872 break;
873
874 retv = -EFAULT;
875 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
876 break;
877
878 if (optname == IPV6_ADD_MEMBERSHIP)
879 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
880 else
881 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
882 break;
883 }
884 case IPV6_JOIN_ANYCAST:
885 case IPV6_LEAVE_ANYCAST:
886 {
887 struct ipv6_mreq mreq;
888
889 if (optlen < sizeof(struct ipv6_mreq))
890 goto e_inval;
891
892 retv = -EFAULT;
893 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
894 break;
895
896 if (optname == IPV6_JOIN_ANYCAST)
897 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
898 else
899 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
900 break;
901 }
902 case MCAST_JOIN_GROUP:
903 case MCAST_LEAVE_GROUP:
904 if (in_compat_syscall())
905 retv = compat_ipv6_mcast_join_leave(sk, optname, optval,
906 optlen);
907 else
908 retv = ipv6_mcast_join_leave(sk, optname, optval,
909 optlen);
910 break;
911 case MCAST_JOIN_SOURCE_GROUP:
912 case MCAST_LEAVE_SOURCE_GROUP:
913 case MCAST_BLOCK_SOURCE:
914 case MCAST_UNBLOCK_SOURCE:
915 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen);
916 break;
917 case MCAST_MSFILTER:
918 if (in_compat_syscall())
919 retv = compat_ipv6_set_mcast_msfilter(sk, optval,
920 optlen);
921 else
922 retv = ipv6_set_mcast_msfilter(sk, optval, optlen);
923 break;
924 case IPV6_ROUTER_ALERT:
925 if (optlen < sizeof(int))
926 goto e_inval;
927 retv = ip6_ra_control(sk, val);
928 if (retv == 0)
929 inet6_assign_bit(RTALERT, sk, valbool);
930 break;
931 case IPV6_FLOWLABEL_MGR:
932 retv = ipv6_flowlabel_opt(sk, optval, optlen);
933 break;
934 case IPV6_IPSEC_POLICY:
935 case IPV6_XFRM_POLICY:
936 retv = -EPERM;
937 if (!sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN))
938 break;
939 retv = xfrm_user_policy(sk, optname, optval, optlen);
940 break;
941
942 case IPV6_RECVFRAGSIZE:
943 np->rxopt.bits.recvfragsize = valbool;
944 retv = 0;
945 break;
946 }
947
948 unlock:
949 sockopt_release_sock(sk);
950
951 return retv;
952
953 e_inval:
954 retv = -EINVAL;
955 goto unlock;
956 }
957
ipv6_setsockopt(struct sock * sk,int level,int optname,sockptr_t optval,unsigned int optlen)958 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
959 unsigned int optlen)
960 {
961 int err;
962
963 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
964 return ip_setsockopt(sk, level, optname, optval, optlen);
965
966 if (level != SOL_IPV6)
967 return -ENOPROTOOPT;
968
969 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
970 #ifdef CONFIG_NETFILTER
971 /* we need to exclude all possible ENOPROTOOPTs except default case */
972 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
973 optname != IPV6_XFRM_POLICY)
974 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
975 #endif
976 return err;
977 }
978 EXPORT_SYMBOL(ipv6_setsockopt);
979
ipv6_getsockopt_sticky(struct sock * sk,struct ipv6_txoptions * opt,int optname,sockptr_t optval,int len)980 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
981 int optname, sockptr_t optval, int len)
982 {
983 struct ipv6_opt_hdr *hdr;
984
985 if (!opt)
986 return 0;
987
988 switch (optname) {
989 case IPV6_HOPOPTS:
990 hdr = opt->hopopt;
991 break;
992 case IPV6_RTHDRDSTOPTS:
993 hdr = opt->dst0opt;
994 break;
995 case IPV6_RTHDR:
996 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
997 break;
998 case IPV6_DSTOPTS:
999 hdr = opt->dst1opt;
1000 break;
1001 default:
1002 return -EINVAL; /* should not happen */
1003 }
1004
1005 if (!hdr)
1006 return 0;
1007
1008 len = min_t(unsigned int, len, ipv6_optlen(hdr));
1009 if (copy_to_sockptr(optval, hdr, len))
1010 return -EFAULT;
1011 return len;
1012 }
1013
ipv6_get_msfilter(struct sock * sk,sockptr_t optval,sockptr_t optlen,int len)1014 static int ipv6_get_msfilter(struct sock *sk, sockptr_t optval,
1015 sockptr_t optlen, int len)
1016 {
1017 const int size0 = offsetof(struct group_filter, gf_slist_flex);
1018 struct group_filter gsf;
1019 int num;
1020 int err;
1021
1022 if (len < size0)
1023 return -EINVAL;
1024 if (copy_from_sockptr(&gsf, optval, size0))
1025 return -EFAULT;
1026 if (gsf.gf_group.ss_family != AF_INET6)
1027 return -EADDRNOTAVAIL;
1028 num = gsf.gf_numsrc;
1029 sockopt_lock_sock(sk);
1030 err = ip6_mc_msfget(sk, &gsf, optval, size0);
1031 if (!err) {
1032 if (num > gsf.gf_numsrc)
1033 num = gsf.gf_numsrc;
1034 len = GROUP_FILTER_SIZE(num);
1035 if (copy_to_sockptr(optlen, &len, sizeof(int)) ||
1036 copy_to_sockptr(optval, &gsf, size0))
1037 err = -EFAULT;
1038 }
1039 sockopt_release_sock(sk);
1040 return err;
1041 }
1042
compat_ipv6_get_msfilter(struct sock * sk,sockptr_t optval,sockptr_t optlen,int len)1043 static int compat_ipv6_get_msfilter(struct sock *sk, sockptr_t optval,
1044 sockptr_t optlen, int len)
1045 {
1046 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
1047 struct compat_group_filter gf32;
1048 struct group_filter gf;
1049 int err;
1050 int num;
1051
1052 if (len < size0)
1053 return -EINVAL;
1054
1055 if (copy_from_sockptr(&gf32, optval, size0))
1056 return -EFAULT;
1057 gf.gf_interface = gf32.gf_interface;
1058 gf.gf_fmode = gf32.gf_fmode;
1059 num = gf.gf_numsrc = gf32.gf_numsrc;
1060 gf.gf_group = gf32.gf_group;
1061
1062 if (gf.gf_group.ss_family != AF_INET6)
1063 return -EADDRNOTAVAIL;
1064
1065 sockopt_lock_sock(sk);
1066 err = ip6_mc_msfget(sk, &gf, optval, size0);
1067 sockopt_release_sock(sk);
1068 if (err)
1069 return err;
1070 if (num > gf.gf_numsrc)
1071 num = gf.gf_numsrc;
1072 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32));
1073 if (copy_to_sockptr(optlen, &len, sizeof(int)) ||
1074 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_fmode),
1075 &gf.gf_fmode, sizeof(gf32.gf_fmode)) ||
1076 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_numsrc),
1077 &gf.gf_numsrc, sizeof(gf32.gf_numsrc)))
1078 return -EFAULT;
1079 return 0;
1080 }
1081
do_ipv6_getsockopt(struct sock * sk,int level,int optname,sockptr_t optval,sockptr_t optlen)1082 int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1083 sockptr_t optval, sockptr_t optlen)
1084 {
1085 struct ipv6_pinfo *np = inet6_sk(sk);
1086 int len;
1087 int val;
1088
1089 if (ip6_mroute_opt(optname))
1090 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1091
1092 if (copy_from_sockptr(&len, optlen, sizeof(int)))
1093 return -EFAULT;
1094 switch (optname) {
1095 case IPV6_ADDRFORM:
1096 if (sk->sk_protocol != IPPROTO_UDP &&
1097 sk->sk_protocol != IPPROTO_UDPLITE &&
1098 sk->sk_protocol != IPPROTO_TCP)
1099 return -ENOPROTOOPT;
1100 if (sk->sk_state != TCP_ESTABLISHED)
1101 return -ENOTCONN;
1102 val = sk->sk_family;
1103 break;
1104 case MCAST_MSFILTER:
1105 if (in_compat_syscall())
1106 return compat_ipv6_get_msfilter(sk, optval, optlen, len);
1107 return ipv6_get_msfilter(sk, optval, optlen, len);
1108 case IPV6_2292PKTOPTIONS:
1109 {
1110 struct msghdr msg;
1111 struct sk_buff *skb;
1112
1113 if (sk->sk_type != SOCK_STREAM)
1114 return -ENOPROTOOPT;
1115
1116 if (optval.is_kernel) {
1117 msg.msg_control_is_user = false;
1118 msg.msg_control = optval.kernel;
1119 } else {
1120 msg.msg_control_is_user = true;
1121 msg.msg_control_user = optval.user;
1122 }
1123 msg.msg_controllen = len;
1124 msg.msg_flags = 0;
1125
1126 sockopt_lock_sock(sk);
1127 skb = np->pktoptions;
1128 if (skb)
1129 ip6_datagram_recv_ctl(sk, &msg, skb);
1130 sockopt_release_sock(sk);
1131 if (!skb) {
1132 if (np->rxopt.bits.rxinfo) {
1133 int mcast_oif = READ_ONCE(np->mcast_oif);
1134 struct in6_pktinfo src_info;
1135
1136 src_info.ipi6_ifindex = mcast_oif ? :
1137 np->sticky_pktinfo.ipi6_ifindex;
1138 src_info.ipi6_addr = mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1139 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1140 }
1141 if (np->rxopt.bits.rxhlim) {
1142 int hlim = READ_ONCE(np->mcast_hops);
1143
1144 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1145 }
1146 if (np->rxopt.bits.rxtclass) {
1147 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1148
1149 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1150 }
1151 if (np->rxopt.bits.rxoinfo) {
1152 int mcast_oif = READ_ONCE(np->mcast_oif);
1153 struct in6_pktinfo src_info;
1154
1155 src_info.ipi6_ifindex = mcast_oif ? :
1156 np->sticky_pktinfo.ipi6_ifindex;
1157 src_info.ipi6_addr = mcast_oif ? sk->sk_v6_daddr :
1158 np->sticky_pktinfo.ipi6_addr;
1159 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1160 }
1161 if (np->rxopt.bits.rxohlim) {
1162 int hlim = READ_ONCE(np->mcast_hops);
1163
1164 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1165 }
1166 if (np->rxopt.bits.rxflow) {
1167 __be32 flowinfo = np->rcv_flowinfo;
1168
1169 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1170 }
1171 }
1172 len -= msg.msg_controllen;
1173 return copy_to_sockptr(optlen, &len, sizeof(int));
1174 }
1175 case IPV6_MTU:
1176 {
1177 struct dst_entry *dst;
1178
1179 val = 0;
1180 rcu_read_lock();
1181 dst = __sk_dst_get(sk);
1182 if (dst)
1183 val = dst_mtu(dst);
1184 rcu_read_unlock();
1185 if (!val)
1186 return -ENOTCONN;
1187 break;
1188 }
1189
1190 case IPV6_V6ONLY:
1191 val = sk->sk_ipv6only;
1192 break;
1193
1194 case IPV6_RECVPKTINFO:
1195 val = np->rxopt.bits.rxinfo;
1196 break;
1197
1198 case IPV6_2292PKTINFO:
1199 val = np->rxopt.bits.rxoinfo;
1200 break;
1201
1202 case IPV6_RECVHOPLIMIT:
1203 val = np->rxopt.bits.rxhlim;
1204 break;
1205
1206 case IPV6_2292HOPLIMIT:
1207 val = np->rxopt.bits.rxohlim;
1208 break;
1209
1210 case IPV6_RECVRTHDR:
1211 val = np->rxopt.bits.srcrt;
1212 break;
1213
1214 case IPV6_2292RTHDR:
1215 val = np->rxopt.bits.osrcrt;
1216 break;
1217
1218 case IPV6_HOPOPTS:
1219 case IPV6_RTHDRDSTOPTS:
1220 case IPV6_RTHDR:
1221 case IPV6_DSTOPTS:
1222 {
1223 struct ipv6_txoptions *opt;
1224
1225 sockopt_lock_sock(sk);
1226 opt = rcu_dereference_protected(np->opt,
1227 lockdep_sock_is_held(sk));
1228 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1229 sockopt_release_sock(sk);
1230 /* check if ipv6_getsockopt_sticky() returns err code */
1231 if (len < 0)
1232 return len;
1233 return copy_to_sockptr(optlen, &len, sizeof(int));
1234 }
1235
1236 case IPV6_RECVHOPOPTS:
1237 val = np->rxopt.bits.hopopts;
1238 break;
1239
1240 case IPV6_2292HOPOPTS:
1241 val = np->rxopt.bits.ohopopts;
1242 break;
1243
1244 case IPV6_RECVDSTOPTS:
1245 val = np->rxopt.bits.dstopts;
1246 break;
1247
1248 case IPV6_2292DSTOPTS:
1249 val = np->rxopt.bits.odstopts;
1250 break;
1251
1252 case IPV6_TCLASS:
1253 val = np->tclass;
1254 break;
1255
1256 case IPV6_RECVTCLASS:
1257 val = np->rxopt.bits.rxtclass;
1258 break;
1259
1260 case IPV6_FLOWINFO:
1261 val = np->rxopt.bits.rxflow;
1262 break;
1263
1264 case IPV6_RECVPATHMTU:
1265 val = np->rxopt.bits.rxpmtu;
1266 break;
1267
1268 case IPV6_PATHMTU:
1269 {
1270 struct dst_entry *dst;
1271 struct ip6_mtuinfo mtuinfo;
1272
1273 if (len < sizeof(mtuinfo))
1274 return -EINVAL;
1275
1276 len = sizeof(mtuinfo);
1277 memset(&mtuinfo, 0, sizeof(mtuinfo));
1278
1279 rcu_read_lock();
1280 dst = __sk_dst_get(sk);
1281 if (dst)
1282 mtuinfo.ip6m_mtu = dst_mtu(dst);
1283 rcu_read_unlock();
1284 if (!mtuinfo.ip6m_mtu)
1285 return -ENOTCONN;
1286
1287 if (copy_to_sockptr(optlen, &len, sizeof(int)))
1288 return -EFAULT;
1289 if (copy_to_sockptr(optval, &mtuinfo, len))
1290 return -EFAULT;
1291
1292 return 0;
1293 }
1294
1295 case IPV6_TRANSPARENT:
1296 val = inet_test_bit(TRANSPARENT, sk);
1297 break;
1298
1299 case IPV6_FREEBIND:
1300 val = inet_test_bit(FREEBIND, sk);
1301 break;
1302
1303 case IPV6_RECVORIGDSTADDR:
1304 val = np->rxopt.bits.rxorigdstaddr;
1305 break;
1306
1307 case IPV6_UNICAST_HOPS:
1308 case IPV6_MULTICAST_HOPS:
1309 {
1310 struct dst_entry *dst;
1311
1312 if (optname == IPV6_UNICAST_HOPS)
1313 val = READ_ONCE(np->hop_limit);
1314 else
1315 val = READ_ONCE(np->mcast_hops);
1316
1317 if (val < 0) {
1318 rcu_read_lock();
1319 dst = __sk_dst_get(sk);
1320 if (dst)
1321 val = ip6_dst_hoplimit(dst);
1322 rcu_read_unlock();
1323 }
1324
1325 if (val < 0)
1326 val = READ_ONCE(sock_net(sk)->ipv6.devconf_all->hop_limit);
1327 break;
1328 }
1329
1330 case IPV6_MULTICAST_LOOP:
1331 val = inet6_test_bit(MC6_LOOP, sk);
1332 break;
1333
1334 case IPV6_MULTICAST_IF:
1335 val = READ_ONCE(np->mcast_oif);
1336 break;
1337
1338 case IPV6_MULTICAST_ALL:
1339 val = inet6_test_bit(MC6_ALL, sk);
1340 break;
1341
1342 case IPV6_UNICAST_IF:
1343 val = (__force int)htonl((__u32) READ_ONCE(np->ucast_oif));
1344 break;
1345
1346 case IPV6_MTU_DISCOVER:
1347 val = READ_ONCE(np->pmtudisc);
1348 break;
1349
1350 case IPV6_RECVERR:
1351 val = inet6_test_bit(RECVERR6, sk);
1352 break;
1353
1354 case IPV6_FLOWINFO_SEND:
1355 val = inet6_test_bit(SNDFLOW, sk);
1356 break;
1357
1358 case IPV6_FLOWLABEL_MGR:
1359 {
1360 struct in6_flowlabel_req freq;
1361 int flags;
1362
1363 if (len < sizeof(freq))
1364 return -EINVAL;
1365
1366 if (copy_from_sockptr(&freq, optval, sizeof(freq)))
1367 return -EFAULT;
1368
1369 if (freq.flr_action != IPV6_FL_A_GET)
1370 return -EINVAL;
1371
1372 len = sizeof(freq);
1373 flags = freq.flr_flags;
1374
1375 memset(&freq, 0, sizeof(freq));
1376
1377 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1378 if (val < 0)
1379 return val;
1380
1381 if (copy_to_sockptr(optlen, &len, sizeof(int)))
1382 return -EFAULT;
1383 if (copy_to_sockptr(optval, &freq, len))
1384 return -EFAULT;
1385
1386 return 0;
1387 }
1388
1389 case IPV6_ADDR_PREFERENCES:
1390 {
1391 u8 srcprefs = READ_ONCE(np->srcprefs);
1392 val = 0;
1393
1394 if (srcprefs & IPV6_PREFER_SRC_TMP)
1395 val |= IPV6_PREFER_SRC_TMP;
1396 else if (srcprefs & IPV6_PREFER_SRC_PUBLIC)
1397 val |= IPV6_PREFER_SRC_PUBLIC;
1398 else {
1399 /* XXX: should we return system default? */
1400 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1401 }
1402
1403 if (srcprefs & IPV6_PREFER_SRC_COA)
1404 val |= IPV6_PREFER_SRC_COA;
1405 else
1406 val |= IPV6_PREFER_SRC_HOME;
1407 break;
1408 }
1409 case IPV6_MINHOPCOUNT:
1410 val = READ_ONCE(np->min_hopcount);
1411 break;
1412
1413 case IPV6_DONTFRAG:
1414 val = inet6_test_bit(DONTFRAG, sk);
1415 break;
1416
1417 case IPV6_AUTOFLOWLABEL:
1418 val = ip6_autoflowlabel(sock_net(sk), sk);
1419 break;
1420
1421 case IPV6_RECVFRAGSIZE:
1422 val = np->rxopt.bits.recvfragsize;
1423 break;
1424
1425 case IPV6_ROUTER_ALERT:
1426 val = inet6_test_bit(RTALERT, sk);
1427 break;
1428
1429 case IPV6_ROUTER_ALERT_ISOLATE:
1430 val = inet6_test_bit(RTALERT_ISOLATE, sk);
1431 break;
1432
1433 case IPV6_RECVERR_RFC4884:
1434 val = inet6_test_bit(RECVERR6_RFC4884, sk);
1435 break;
1436
1437 default:
1438 return -ENOPROTOOPT;
1439 }
1440 len = min_t(unsigned int, sizeof(int), len);
1441 if (copy_to_sockptr(optlen, &len, sizeof(int)))
1442 return -EFAULT;
1443 if (copy_to_sockptr(optval, &val, len))
1444 return -EFAULT;
1445 return 0;
1446 }
1447
ipv6_getsockopt(struct sock * sk,int level,int optname,char __user * optval,int __user * optlen)1448 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1449 char __user *optval, int __user *optlen)
1450 {
1451 int err;
1452
1453 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1454 return ip_getsockopt(sk, level, optname, optval, optlen);
1455
1456 if (level != SOL_IPV6)
1457 return -ENOPROTOOPT;
1458
1459 err = do_ipv6_getsockopt(sk, level, optname,
1460 USER_SOCKPTR(optval), USER_SOCKPTR(optlen));
1461 #ifdef CONFIG_NETFILTER
1462 /* we need to exclude all possible ENOPROTOOPTs except default case */
1463 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1464 int len;
1465
1466 if (get_user(len, optlen))
1467 return -EFAULT;
1468
1469 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1470 if (err >= 0)
1471 err = put_user(len, optlen);
1472 }
1473 #endif
1474 return err;
1475 }
1476 EXPORT_SYMBOL(ipv6_getsockopt);
1477