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#include <net/psp.h>
53
54#include <linux/uaccess.h>
55
56struct ip6_ra_chain *ip6_ra_chain;
57DEFINE_RWLOCK(ip6_ra_lock);
58
59DEFINE_STATIC_KEY_FALSE(ip6_min_hopcount);
60
61int ip6_ra_control(struct sock *sk, int sel)
62{
63 struct ip6_ra_chain *ra, *new_ra, **rap;
64
65 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
66 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
67 return -ENOPROTOOPT;
68
69 new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
70 if (sel >= 0 && !new_ra)
71 return -ENOMEM;
72
73 write_lock_bh(&ip6_ra_lock);
74 for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
75 if (ra->sk == sk) {
76 if (sel >= 0) {
77 write_unlock_bh(&ip6_ra_lock);
78 kfree(objp: new_ra);
79 return -EADDRINUSE;
80 }
81
82 *rap = ra->next;
83 write_unlock_bh(&ip6_ra_lock);
84
85 sock_put(sk);
86 kfree(objp: ra);
87 return 0;
88 }
89 }
90 if (!new_ra) {
91 write_unlock_bh(&ip6_ra_lock);
92 return -ENOBUFS;
93 }
94 new_ra->sk = sk;
95 new_ra->sel = sel;
96 new_ra->next = ra;
97 *rap = new_ra;
98 sock_hold(sk);
99 write_unlock_bh(&ip6_ra_lock);
100 return 0;
101}
102
103struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
104 struct ipv6_txoptions *opt)
105{
106 if (inet_test_bit(IS_ICSK, sk)) {
107 if (opt &&
108 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
109 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
110 struct inet_connection_sock *icsk = inet_csk(sk);
111
112 icsk->icsk_ext_hdr_len =
113 psp_sk_overhead(sk) +
114 opt->opt_flen + opt->opt_nflen;
115 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
116 }
117 }
118 opt = unrcu_pointer(xchg(&inet6_sk(sk)->opt, RCU_INITIALIZER(opt)));
119 sk_dst_reset(sk);
120
121 return opt;
122}
123
124static int copy_group_source_from_sockptr(struct group_source_req *greqs,
125 sockptr_t optval, int optlen)
126{
127 if (in_compat_syscall()) {
128 struct compat_group_source_req gr32;
129
130 if (optlen < sizeof(gr32))
131 return -EINVAL;
132 if (copy_from_sockptr(dst: &gr32, src: optval, size: sizeof(gr32)))
133 return -EFAULT;
134 greqs->gsr_interface = gr32.gsr_interface;
135 greqs->gsr_group = gr32.gsr_group;
136 greqs->gsr_source = gr32.gsr_source;
137 } else {
138 if (optlen < sizeof(*greqs))
139 return -EINVAL;
140 if (copy_from_sockptr(dst: greqs, src: optval, size: sizeof(*greqs)))
141 return -EFAULT;
142 }
143
144 return 0;
145}
146
147static int do_ipv6_mcast_group_source(struct sock *sk, int optname,
148 sockptr_t optval, int optlen)
149{
150 struct group_source_req greqs;
151 int omode, add;
152 int ret;
153
154 ret = copy_group_source_from_sockptr(greqs: &greqs, optval, optlen);
155 if (ret)
156 return ret;
157
158 if (greqs.gsr_group.ss_family != AF_INET6 ||
159 greqs.gsr_source.ss_family != AF_INET6)
160 return -EADDRNOTAVAIL;
161
162 if (optname == MCAST_BLOCK_SOURCE) {
163 omode = MCAST_EXCLUDE;
164 add = 1;
165 } else if (optname == MCAST_UNBLOCK_SOURCE) {
166 omode = MCAST_EXCLUDE;
167 add = 0;
168 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
169 struct sockaddr_in6 *psin6;
170 int retv;
171
172 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
173 retv = ipv6_sock_mc_join_ssm(sk, ifindex: greqs.gsr_interface,
174 addr: &psin6->sin6_addr,
175 MCAST_INCLUDE);
176 /* prior join w/ different source is ok */
177 if (retv && retv != -EADDRINUSE)
178 return retv;
179 omode = MCAST_INCLUDE;
180 add = 1;
181 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
182 omode = MCAST_INCLUDE;
183 add = 0;
184 }
185 return ip6_mc_source(add, omode, sk, pgsr: &greqs);
186}
187
188static int ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
189 int optlen)
190{
191 struct group_filter *gsf;
192 int ret;
193
194 if (optlen < GROUP_FILTER_SIZE(0))
195 return -EINVAL;
196 if (optlen > READ_ONCE(sock_net(sk)->core.sysctl_optmem_max))
197 return -ENOBUFS;
198
199 gsf = memdup_sockptr(optval, optlen);
200 if (IS_ERR(ptr: gsf))
201 return PTR_ERR(ptr: gsf);
202
203 /* numsrc >= (4G-140)/128 overflow in 32 bits */
204 ret = -ENOBUFS;
205 if (gsf->gf_numsrc >= 0x1ffffffU ||
206 gsf->gf_numsrc > sysctl_mld_max_msf)
207 goto out_free_gsf;
208
209 ret = -EINVAL;
210 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen)
211 goto out_free_gsf;
212
213 ret = ip6_mc_msfilter(sk, gsf, list: gsf->gf_slist_flex);
214out_free_gsf:
215 kfree(objp: gsf);
216 return ret;
217}
218
219static int compat_ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
220 int optlen)
221{
222 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
223 struct compat_group_filter *gf32;
224 void *p;
225 int ret;
226 int n;
227
228 if (optlen < size0)
229 return -EINVAL;
230 if (optlen > READ_ONCE(sock_net(sk)->core.sysctl_optmem_max) - 4)
231 return -ENOBUFS;
232
233 p = kmalloc(optlen + 4, GFP_KERNEL);
234 if (!p)
235 return -ENOMEM;
236
237 gf32 = p + 4; /* we want ->gf_group and ->gf_slist_flex aligned */
238 ret = -EFAULT;
239 if (copy_from_sockptr(dst: gf32, src: optval, size: optlen))
240 goto out_free_p;
241
242 /* numsrc >= (4G-140)/128 overflow in 32 bits */
243 ret = -ENOBUFS;
244 n = gf32->gf_numsrc;
245 if (n >= 0x1ffffffU || n > sysctl_mld_max_msf)
246 goto out_free_p;
247
248 ret = -EINVAL;
249 if (offsetof(struct compat_group_filter, gf_slist_flex[n]) > optlen)
250 goto out_free_p;
251
252 ret = ip6_mc_msfilter(sk, gsf: &(struct group_filter){
253 .gf_interface = gf32->gf_interface,
254 .gf_group = gf32->gf_group,
255 .gf_fmode = gf32->gf_fmode,
256 .gf_numsrc = gf32->gf_numsrc}, list: gf32->gf_slist_flex);
257
258out_free_p:
259 kfree(objp: p);
260 return ret;
261}
262
263static int ipv6_mcast_join_leave(struct sock *sk, int optname,
264 sockptr_t optval, int optlen)
265{
266 struct sockaddr_in6 *psin6;
267 struct group_req greq;
268
269 if (optlen < sizeof(greq))
270 return -EINVAL;
271 if (copy_from_sockptr(dst: &greq, src: optval, size: sizeof(greq)))
272 return -EFAULT;
273
274 if (greq.gr_group.ss_family != AF_INET6)
275 return -EADDRNOTAVAIL;
276 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
277 if (optname == MCAST_JOIN_GROUP)
278 return ipv6_sock_mc_join(sk, ifindex: greq.gr_interface,
279 addr: &psin6->sin6_addr);
280 return ipv6_sock_mc_drop(sk, ifindex: greq.gr_interface, addr: &psin6->sin6_addr);
281}
282
283static int compat_ipv6_mcast_join_leave(struct sock *sk, int optname,
284 sockptr_t optval, int optlen)
285{
286 struct compat_group_req gr32;
287 struct sockaddr_in6 *psin6;
288
289 if (optlen < sizeof(gr32))
290 return -EINVAL;
291 if (copy_from_sockptr(dst: &gr32, src: optval, size: sizeof(gr32)))
292 return -EFAULT;
293
294 if (gr32.gr_group.ss_family != AF_INET6)
295 return -EADDRNOTAVAIL;
296 psin6 = (struct sockaddr_in6 *)&gr32.gr_group;
297 if (optname == MCAST_JOIN_GROUP)
298 return ipv6_sock_mc_join(sk, ifindex: gr32.gr_interface,
299 addr: &psin6->sin6_addr);
300 return ipv6_sock_mc_drop(sk, ifindex: gr32.gr_interface, addr: &psin6->sin6_addr);
301}
302
303static int ipv6_set_opt_hdr(struct sock *sk, int optname, sockptr_t optval,
304 int optlen)
305{
306 struct ipv6_pinfo *np = inet6_sk(sk: sk);
307 struct ipv6_opt_hdr *new = NULL;
308 struct net *net = sock_net(sk);
309 struct ipv6_txoptions *opt;
310 int err;
311
312 /* hop-by-hop / destination options are privileged option */
313 if (optname != IPV6_RTHDR && !sockopt_ns_capable(ns: net->user_ns, CAP_NET_RAW))
314 return -EPERM;
315
316 /* remove any sticky options header with a zero option
317 * length, per RFC3542.
318 */
319 if (optlen > 0) {
320 if (sockptr_is_null(sockptr: optval))
321 return -EINVAL;
322 if (optlen < sizeof(struct ipv6_opt_hdr) ||
323 optlen & 0x7 ||
324 optlen > 8 * 255)
325 return -EINVAL;
326
327 new = memdup_sockptr(optval, optlen);
328 if (IS_ERR(ptr: new))
329 return PTR_ERR(ptr: new);
330 if (unlikely(ipv6_optlen(new) > optlen)) {
331 kfree(objp: new);
332 return -EINVAL;
333 }
334 }
335
336 opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk));
337 opt = ipv6_renew_options(sk, opt, newtype: optname, newopt: new);
338 kfree(objp: new);
339 if (IS_ERR(ptr: opt))
340 return PTR_ERR(ptr: opt);
341
342 /* routing header option needs extra check */
343 err = -EINVAL;
344 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
345 struct ipv6_rt_hdr *rthdr = opt->srcrt;
346 switch (rthdr->type) {
347#if IS_ENABLED(CONFIG_IPV6_MIP6)
348 case IPV6_SRCRT_TYPE_2:
349 if (rthdr->hdrlen != 2 || rthdr->segments_left != 1)
350 goto sticky_done;
351 break;
352#endif
353 case IPV6_SRCRT_TYPE_4:
354 {
355 struct ipv6_sr_hdr *srh =
356 (struct ipv6_sr_hdr *)opt->srcrt;
357
358 if (!seg6_validate_srh(srh, len: optlen, reduced: false))
359 goto sticky_done;
360 break;
361 }
362 default:
363 goto sticky_done;
364 }
365 }
366
367 err = 0;
368 opt = ipv6_update_options(sk, opt);
369sticky_done:
370 if (opt) {
371 atomic_sub(i: opt->tot_len, v: &sk->sk_omem_alloc);
372 txopt_put(opt);
373 }
374 return err;
375}
376
377int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
378 sockptr_t optval, unsigned int optlen)
379{
380 struct ipv6_pinfo *np = inet6_sk(sk: sk);
381 struct net *net = sock_net(sk);
382 int retv = -ENOPROTOOPT;
383 int val, valbool;
384
385 if (sockptr_is_null(sockptr: optval))
386 val = 0;
387 else {
388 if (optlen >= sizeof(int)) {
389 if (copy_from_sockptr(dst: &val, src: optval, size: sizeof(val)))
390 return -EFAULT;
391 } else
392 val = 0;
393 }
394
395 valbool = (val != 0);
396
397 if (ip6_mroute_opt(opt: optname))
398 return ip6_mroute_setsockopt(sock: sk, optname, optval, optlen);
399
400 /* Handle options that can be set without locking the socket. */
401 switch (optname) {
402 case IPV6_UNICAST_HOPS:
403 if (optlen < sizeof(int))
404 return -EINVAL;
405 if (val > 255 || val < -1)
406 return -EINVAL;
407 WRITE_ONCE(np->hop_limit, val);
408 return 0;
409 case IPV6_MULTICAST_LOOP:
410 if (optlen < sizeof(int))
411 return -EINVAL;
412 if (val != valbool)
413 return -EINVAL;
414 inet6_assign_bit(MC6_LOOP, sk, valbool);
415 return 0;
416 case IPV6_MULTICAST_HOPS:
417 if (sk->sk_type == SOCK_STREAM)
418 return retv;
419 if (optlen < sizeof(int))
420 return -EINVAL;
421 if (val > 255 || val < -1)
422 return -EINVAL;
423 WRITE_ONCE(np->mcast_hops,
424 val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
425 return 0;
426 case IPV6_MTU:
427 if (optlen < sizeof(int))
428 return -EINVAL;
429 if (val && val < IPV6_MIN_MTU)
430 return -EINVAL;
431 WRITE_ONCE(np->frag_size, val);
432 return 0;
433 case IPV6_MINHOPCOUNT:
434 if (optlen < sizeof(int))
435 return -EINVAL;
436 if (val < 0 || val > 255)
437 return -EINVAL;
438
439 if (val)
440 static_branch_enable(&ip6_min_hopcount);
441
442 /* tcp_v6_err() and tcp_v6_rcv() might read min_hopcount
443 * while we are changing it.
444 */
445 WRITE_ONCE(np->min_hopcount, val);
446 return 0;
447 case IPV6_RECVERR_RFC4884:
448 if (optlen < sizeof(int))
449 return -EINVAL;
450 if (val < 0 || val > 1)
451 return -EINVAL;
452 inet6_assign_bit(RECVERR6_RFC4884, sk, valbool);
453 return 0;
454 case IPV6_MULTICAST_ALL:
455 if (optlen < sizeof(int))
456 return -EINVAL;
457 inet6_assign_bit(MC6_ALL, sk, valbool);
458 return 0;
459 case IPV6_AUTOFLOWLABEL:
460 inet6_assign_bit(AUTOFLOWLABEL, sk, valbool);
461 inet6_set_bit(AUTOFLOWLABEL_SET, sk);
462 return 0;
463 case IPV6_DONTFRAG:
464 inet6_assign_bit(DONTFRAG, sk, valbool);
465 return 0;
466 case IPV6_RECVERR:
467 if (optlen < sizeof(int))
468 return -EINVAL;
469 inet6_assign_bit(RECVERR6, sk, valbool);
470 if (!val)
471 skb_errqueue_purge(list: &sk->sk_error_queue);
472 return 0;
473 case IPV6_ROUTER_ALERT_ISOLATE:
474 if (optlen < sizeof(int))
475 return -EINVAL;
476 inet6_assign_bit(RTALERT_ISOLATE, sk, valbool);
477 return 0;
478 case IPV6_MTU_DISCOVER:
479 if (optlen < sizeof(int))
480 return -EINVAL;
481 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
482 return -EINVAL;
483 WRITE_ONCE(np->pmtudisc, val);
484 return 0;
485 case IPV6_FLOWINFO_SEND:
486 if (optlen < sizeof(int))
487 return -EINVAL;
488 inet6_assign_bit(SNDFLOW, sk, valbool);
489 return 0;
490 case IPV6_ADDR_PREFERENCES:
491 if (optlen < sizeof(int))
492 return -EINVAL;
493 return ip6_sock_set_addr_preferences(sk, val);
494 case IPV6_MULTICAST_IF:
495 if (sk->sk_type == SOCK_STREAM)
496 return -ENOPROTOOPT;
497 if (optlen < sizeof(int))
498 return -EINVAL;
499 if (val) {
500 struct net_device *dev;
501 int bound_dev_if, midx;
502
503 rcu_read_lock();
504
505 dev = dev_get_by_index_rcu(net, ifindex: val);
506 if (!dev) {
507 rcu_read_unlock();
508 return -ENODEV;
509 }
510 midx = l3mdev_master_ifindex_rcu(dev);
511
512 rcu_read_unlock();
513
514 bound_dev_if = READ_ONCE(sk->sk_bound_dev_if);
515 if (bound_dev_if &&
516 bound_dev_if != val &&
517 (!midx || midx != bound_dev_if))
518 return -EINVAL;
519 }
520 WRITE_ONCE(np->mcast_oif, val);
521 return 0;
522 case IPV6_UNICAST_IF:
523 {
524 struct net_device *dev;
525 int ifindex;
526
527 if (optlen != sizeof(int))
528 return -EINVAL;
529
530 ifindex = (__force int)ntohl((__force __be32)val);
531 if (!ifindex) {
532 WRITE_ONCE(np->ucast_oif, 0);
533 return 0;
534 }
535
536 dev = dev_get_by_index(net, ifindex);
537 if (!dev)
538 return -EADDRNOTAVAIL;
539 dev_put(dev);
540
541 if (READ_ONCE(sk->sk_bound_dev_if))
542 return -EINVAL;
543
544 WRITE_ONCE(np->ucast_oif, ifindex);
545 return 0;
546 }
547 }
548
549 sockopt_lock_sock(sk);
550
551 /* Another thread has converted the socket into IPv4 with
552 * IPV6_ADDRFORM concurrently.
553 */
554 if (unlikely(sk->sk_family != AF_INET6))
555 goto unlock;
556
557 switch (optname) {
558
559 case IPV6_ADDRFORM:
560 if (optlen < sizeof(int))
561 goto e_inval;
562 if (val == PF_INET) {
563 if (sk->sk_type == SOCK_RAW)
564 break;
565
566 if (sk->sk_protocol == IPPROTO_UDP ||
567 sk->sk_protocol == IPPROTO_UDPLITE) {
568 struct udp_sock *up = udp_sk(sk);
569 if (up->pending == AF_INET6) {
570 retv = -EBUSY;
571 break;
572 }
573 } else if (sk->sk_protocol == IPPROTO_TCP) {
574 if (sk->sk_prot != &tcpv6_prot) {
575 retv = -EBUSY;
576 break;
577 }
578 } else {
579 break;
580 }
581
582 if (sk->sk_state != TCP_ESTABLISHED) {
583 retv = -ENOTCONN;
584 break;
585 }
586
587 if (ipv6_only_sock(sk) ||
588 !ipv6_addr_v4mapped(a: &sk->sk_v6_daddr)) {
589 retv = -EADDRNOTAVAIL;
590 break;
591 }
592
593 __ipv6_sock_mc_close(sk);
594 __ipv6_sock_ac_close(sk);
595
596 if (sk->sk_protocol == IPPROTO_TCP) {
597 struct inet_connection_sock *icsk = inet_csk(sk);
598
599 sock_prot_inuse_add(net, prot: sk->sk_prot, val: -1);
600 sock_prot_inuse_add(net, prot: &tcp_prot, val: 1);
601
602 /* Paired with READ_ONCE(sk->sk_prot) in inet6_stream_ops */
603 WRITE_ONCE(sk->sk_prot, &tcp_prot);
604 /* Paired with READ_ONCE() in tcp_(get|set)sockopt() */
605 WRITE_ONCE(icsk->icsk_af_ops, &ipv4_specific);
606 WRITE_ONCE(sk->sk_socket->ops, &inet_stream_ops);
607 WRITE_ONCE(sk->sk_family, PF_INET);
608 tcp_sync_mss(sk, pmtu: icsk->icsk_pmtu_cookie);
609 } else {
610 struct proto *prot = &udp_prot;
611
612 if (sk->sk_protocol == IPPROTO_UDPLITE)
613 prot = &udplite_prot;
614
615 sock_prot_inuse_add(net, prot: sk->sk_prot, val: -1);
616 sock_prot_inuse_add(net, prot, val: 1);
617
618 /* Paired with READ_ONCE(sk->sk_prot) in inet6_dgram_ops */
619 WRITE_ONCE(sk->sk_prot, prot);
620 WRITE_ONCE(sk->sk_socket->ops, &inet_dgram_ops);
621 WRITE_ONCE(sk->sk_family, PF_INET);
622 }
623
624 /* Disable all options not to allocate memory anymore,
625 * but there is still a race. See the lockless path
626 * in udpv6_sendmsg() and ipv6_local_rxpmtu().
627 */
628 np->rxopt.all = 0;
629
630 inet6_cleanup_sock(sk);
631
632 module_put(THIS_MODULE);
633 retv = 0;
634 break;
635 }
636 goto e_inval;
637
638 case IPV6_V6ONLY:
639 if (optlen < sizeof(int) ||
640 inet_sk(sk)->inet_num)
641 goto e_inval;
642 sk->sk_ipv6only = valbool;
643 retv = 0;
644 break;
645
646 case IPV6_RECVPKTINFO:
647 if (optlen < sizeof(int))
648 goto e_inval;
649 np->rxopt.bits.rxinfo = valbool;
650 retv = 0;
651 break;
652
653 case IPV6_2292PKTINFO:
654 if (optlen < sizeof(int))
655 goto e_inval;
656 np->rxopt.bits.rxoinfo = valbool;
657 retv = 0;
658 break;
659
660 case IPV6_RECVHOPLIMIT:
661 if (optlen < sizeof(int))
662 goto e_inval;
663 np->rxopt.bits.rxhlim = valbool;
664 retv = 0;
665 break;
666
667 case IPV6_2292HOPLIMIT:
668 if (optlen < sizeof(int))
669 goto e_inval;
670 np->rxopt.bits.rxohlim = valbool;
671 retv = 0;
672 break;
673
674 case IPV6_RECVRTHDR:
675 if (optlen < sizeof(int))
676 goto e_inval;
677 np->rxopt.bits.srcrt = valbool;
678 retv = 0;
679 break;
680
681 case IPV6_2292RTHDR:
682 if (optlen < sizeof(int))
683 goto e_inval;
684 np->rxopt.bits.osrcrt = valbool;
685 retv = 0;
686 break;
687
688 case IPV6_RECVHOPOPTS:
689 if (optlen < sizeof(int))
690 goto e_inval;
691 np->rxopt.bits.hopopts = valbool;
692 retv = 0;
693 break;
694
695 case IPV6_2292HOPOPTS:
696 if (optlen < sizeof(int))
697 goto e_inval;
698 np->rxopt.bits.ohopopts = valbool;
699 retv = 0;
700 break;
701
702 case IPV6_RECVDSTOPTS:
703 if (optlen < sizeof(int))
704 goto e_inval;
705 np->rxopt.bits.dstopts = valbool;
706 retv = 0;
707 break;
708
709 case IPV6_2292DSTOPTS:
710 if (optlen < sizeof(int))
711 goto e_inval;
712 np->rxopt.bits.odstopts = valbool;
713 retv = 0;
714 break;
715
716 case IPV6_TCLASS:
717 if (optlen < sizeof(int))
718 goto e_inval;
719 if (val < -1 || val > 0xff)
720 goto e_inval;
721 /* RFC 3542, 6.5: default traffic class of 0x0 */
722 if (val == -1)
723 val = 0;
724 if (sk->sk_type == SOCK_STREAM) {
725 val &= ~INET_ECN_MASK;
726 val |= np->tclass & INET_ECN_MASK;
727 }
728 if (np->tclass != val) {
729 np->tclass = val;
730 sk_dst_reset(sk);
731 }
732 retv = 0;
733 break;
734
735 case IPV6_RECVTCLASS:
736 if (optlen < sizeof(int))
737 goto e_inval;
738 np->rxopt.bits.rxtclass = valbool;
739 retv = 0;
740 break;
741
742 case IPV6_FLOWINFO:
743 if (optlen < sizeof(int))
744 goto e_inval;
745 np->rxopt.bits.rxflow = valbool;
746 retv = 0;
747 break;
748
749 case IPV6_RECVPATHMTU:
750 if (optlen < sizeof(int))
751 goto e_inval;
752 np->rxopt.bits.rxpmtu = valbool;
753 retv = 0;
754 break;
755
756 case IPV6_TRANSPARENT:
757 if (valbool && !sockopt_ns_capable(ns: net->user_ns, CAP_NET_RAW) &&
758 !sockopt_ns_capable(ns: net->user_ns, CAP_NET_ADMIN)) {
759 retv = -EPERM;
760 break;
761 }
762 if (optlen < sizeof(int))
763 goto e_inval;
764 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
765 inet_assign_bit(TRANSPARENT, sk, valbool);
766 retv = 0;
767 break;
768
769 case IPV6_FREEBIND:
770 if (optlen < sizeof(int))
771 goto e_inval;
772 /* we also don't have a separate freebind bit for IPV6 */
773 inet_assign_bit(FREEBIND, sk, valbool);
774 retv = 0;
775 break;
776
777 case IPV6_RECVORIGDSTADDR:
778 if (optlen < sizeof(int))
779 goto e_inval;
780 np->rxopt.bits.rxorigdstaddr = valbool;
781 retv = 0;
782 break;
783
784 case IPV6_HOPOPTS:
785 case IPV6_RTHDRDSTOPTS:
786 case IPV6_RTHDR:
787 case IPV6_DSTOPTS:
788 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen);
789 break;
790
791 case IPV6_PKTINFO:
792 {
793 struct in6_pktinfo pkt;
794
795 if (optlen == 0)
796 goto e_inval;
797 else if (optlen < sizeof(struct in6_pktinfo) ||
798 sockptr_is_null(sockptr: optval))
799 goto e_inval;
800
801 if (copy_from_sockptr(dst: &pkt, src: optval, size: sizeof(pkt))) {
802 retv = -EFAULT;
803 break;
804 }
805 if (!sk_dev_equal_l3scope(sk, dif: pkt.ipi6_ifindex))
806 goto e_inval;
807
808 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
809 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
810 retv = 0;
811 break;
812 }
813
814 case IPV6_2292PKTOPTIONS:
815 {
816 struct ipv6_txoptions *opt = NULL;
817 struct msghdr msg;
818 struct flowi6 fl6;
819 struct ipcm6_cookie ipc6;
820
821 memset(s: &fl6, c: 0, n: sizeof(fl6));
822 fl6.flowi6_oif = sk->sk_bound_dev_if;
823 fl6.flowi6_mark = sk->sk_mark;
824
825 if (optlen == 0)
826 goto update;
827
828 /* 1K is probably excessive
829 * 1K is surely not enough, 2K per standard header is 16K.
830 */
831 retv = -EINVAL;
832 if (optlen > 64*1024)
833 break;
834
835 opt = sock_kmalloc(sk, size: sizeof(*opt) + optlen, GFP_KERNEL);
836 retv = -ENOBUFS;
837 if (!opt)
838 break;
839
840 memset(s: opt, c: 0, n: sizeof(*opt));
841 refcount_set(r: &opt->refcnt, n: 1);
842 opt->tot_len = sizeof(*opt) + optlen;
843 retv = -EFAULT;
844 if (copy_from_sockptr(dst: opt + 1, src: optval, size: optlen))
845 goto done;
846
847 msg.msg_controllen = optlen;
848 msg.msg_control_is_user = false;
849 msg.msg_control = (void *)(opt+1);
850 ipc6.opt = opt;
851
852 retv = ip6_datagram_send_ctl(net, sk, msg: &msg, fl6: &fl6, ipc6: &ipc6);
853 if (retv)
854 goto done;
855update:
856 retv = 0;
857 opt = ipv6_update_options(sk, opt);
858done:
859 if (opt) {
860 atomic_sub(i: opt->tot_len, v: &sk->sk_omem_alloc);
861 txopt_put(opt);
862 }
863 break;
864 }
865
866 case IPV6_ADD_MEMBERSHIP:
867 case IPV6_DROP_MEMBERSHIP:
868 {
869 struct ipv6_mreq mreq;
870
871 if (optlen < sizeof(struct ipv6_mreq))
872 goto e_inval;
873
874 retv = -EPROTO;
875 if (inet_test_bit(IS_ICSK, sk))
876 break;
877
878 retv = -EFAULT;
879 if (copy_from_sockptr(dst: &mreq, src: optval, size: sizeof(struct ipv6_mreq)))
880 break;
881
882 if (optname == IPV6_ADD_MEMBERSHIP)
883 retv = ipv6_sock_mc_join(sk, ifindex: mreq.ipv6mr_ifindex, addr: &mreq.ipv6mr_multiaddr);
884 else
885 retv = ipv6_sock_mc_drop(sk, ifindex: mreq.ipv6mr_ifindex, addr: &mreq.ipv6mr_multiaddr);
886 break;
887 }
888 case IPV6_JOIN_ANYCAST:
889 case IPV6_LEAVE_ANYCAST:
890 {
891 struct ipv6_mreq mreq;
892
893 if (optlen < sizeof(struct ipv6_mreq))
894 goto e_inval;
895
896 retv = -EFAULT;
897 if (copy_from_sockptr(dst: &mreq, src: optval, size: sizeof(struct ipv6_mreq)))
898 break;
899
900 if (optname == IPV6_JOIN_ANYCAST)
901 retv = ipv6_sock_ac_join(sk, ifindex: mreq.ipv6mr_ifindex, addr: &mreq.ipv6mr_acaddr);
902 else
903 retv = ipv6_sock_ac_drop(sk, ifindex: mreq.ipv6mr_ifindex, addr: &mreq.ipv6mr_acaddr);
904 break;
905 }
906 case MCAST_JOIN_GROUP:
907 case MCAST_LEAVE_GROUP:
908 if (in_compat_syscall())
909 retv = compat_ipv6_mcast_join_leave(sk, optname, optval,
910 optlen);
911 else
912 retv = ipv6_mcast_join_leave(sk, optname, optval,
913 optlen);
914 break;
915 case MCAST_JOIN_SOURCE_GROUP:
916 case MCAST_LEAVE_SOURCE_GROUP:
917 case MCAST_BLOCK_SOURCE:
918 case MCAST_UNBLOCK_SOURCE:
919 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen);
920 break;
921 case MCAST_MSFILTER:
922 if (in_compat_syscall())
923 retv = compat_ipv6_set_mcast_msfilter(sk, optval,
924 optlen);
925 else
926 retv = ipv6_set_mcast_msfilter(sk, optval, optlen);
927 break;
928 case IPV6_ROUTER_ALERT:
929 if (optlen < sizeof(int))
930 goto e_inval;
931 retv = ip6_ra_control(sk, sel: val);
932 if (retv == 0)
933 inet6_assign_bit(RTALERT, sk, valbool);
934 break;
935 case IPV6_FLOWLABEL_MGR:
936 retv = ipv6_flowlabel_opt(sk, optval, optlen);
937 break;
938 case IPV6_IPSEC_POLICY:
939 case IPV6_XFRM_POLICY:
940 retv = -EPERM;
941 if (!sockopt_ns_capable(ns: net->user_ns, CAP_NET_ADMIN))
942 break;
943 retv = xfrm_user_policy(sk, optname, optval, optlen);
944 break;
945
946 case IPV6_RECVFRAGSIZE:
947 np->rxopt.bits.recvfragsize = valbool;
948 retv = 0;
949 break;
950 }
951
952unlock:
953 sockopt_release_sock(sk);
954
955 return retv;
956
957e_inval:
958 retv = -EINVAL;
959 goto unlock;
960}
961
962int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
963 unsigned int optlen)
964{
965 int err;
966
967 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
968 return ip_setsockopt(sk, level, optname, optval, optlen);
969
970 if (level != SOL_IPV6)
971 return -ENOPROTOOPT;
972
973 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
974#ifdef CONFIG_NETFILTER
975 /* we need to exclude all possible ENOPROTOOPTs except default case */
976 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
977 optname != IPV6_XFRM_POLICY)
978 err = nf_setsockopt(sk, PF_INET6, optval: optname, opt: optval, len: optlen);
979#endif
980 return err;
981}
982EXPORT_SYMBOL(ipv6_setsockopt);
983
984static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
985 int optname, sockptr_t optval, int len)
986{
987 struct ipv6_opt_hdr *hdr;
988
989 if (!opt)
990 return 0;
991
992 switch (optname) {
993 case IPV6_HOPOPTS:
994 hdr = opt->hopopt;
995 break;
996 case IPV6_RTHDRDSTOPTS:
997 hdr = opt->dst0opt;
998 break;
999 case IPV6_RTHDR:
1000 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1001 break;
1002 case IPV6_DSTOPTS:
1003 hdr = opt->dst1opt;
1004 break;
1005 default:
1006 return -EINVAL; /* should not happen */
1007 }
1008
1009 if (!hdr)
1010 return 0;
1011
1012 len = min_t(unsigned int, len, ipv6_optlen(hdr));
1013 if (copy_to_sockptr(dst: optval, src: hdr, size: len))
1014 return -EFAULT;
1015 return len;
1016}
1017
1018static int ipv6_get_msfilter(struct sock *sk, sockptr_t optval,
1019 sockptr_t optlen, int len)
1020{
1021 const int size0 = offsetof(struct group_filter, gf_slist_flex);
1022 struct group_filter gsf;
1023 int num;
1024 int err;
1025
1026 if (len < size0)
1027 return -EINVAL;
1028 if (copy_from_sockptr(dst: &gsf, src: optval, size: size0))
1029 return -EFAULT;
1030 if (gsf.gf_group.ss_family != AF_INET6)
1031 return -EADDRNOTAVAIL;
1032 num = gsf.gf_numsrc;
1033 sockopt_lock_sock(sk);
1034 err = ip6_mc_msfget(sk, gsf: &gsf, optval, ss_offset: size0);
1035 if (!err) {
1036 if (num > gsf.gf_numsrc)
1037 num = gsf.gf_numsrc;
1038 len = GROUP_FILTER_SIZE(num);
1039 if (copy_to_sockptr(dst: optlen, src: &len, size: sizeof(int)) ||
1040 copy_to_sockptr(dst: optval, src: &gsf, size: size0))
1041 err = -EFAULT;
1042 }
1043 sockopt_release_sock(sk);
1044 return err;
1045}
1046
1047static int compat_ipv6_get_msfilter(struct sock *sk, sockptr_t optval,
1048 sockptr_t optlen, int len)
1049{
1050 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
1051 struct compat_group_filter gf32;
1052 struct group_filter gf;
1053 int err;
1054 int num;
1055
1056 if (len < size0)
1057 return -EINVAL;
1058
1059 if (copy_from_sockptr(dst: &gf32, src: optval, size: size0))
1060 return -EFAULT;
1061 gf.gf_interface = gf32.gf_interface;
1062 gf.gf_fmode = gf32.gf_fmode;
1063 num = gf.gf_numsrc = gf32.gf_numsrc;
1064 gf.gf_group = gf32.gf_group;
1065
1066 if (gf.gf_group.ss_family != AF_INET6)
1067 return -EADDRNOTAVAIL;
1068
1069 sockopt_lock_sock(sk);
1070 err = ip6_mc_msfget(sk, gsf: &gf, optval, ss_offset: size0);
1071 sockopt_release_sock(sk);
1072 if (err)
1073 return err;
1074 if (num > gf.gf_numsrc)
1075 num = gf.gf_numsrc;
1076 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32));
1077 if (copy_to_sockptr(dst: optlen, src: &len, size: sizeof(int)) ||
1078 copy_to_sockptr_offset(dst: optval, offsetof(struct compat_group_filter, gf_fmode),
1079 src: &gf.gf_fmode, size: sizeof(gf32.gf_fmode)) ||
1080 copy_to_sockptr_offset(dst: optval, offsetof(struct compat_group_filter, gf_numsrc),
1081 src: &gf.gf_numsrc, size: sizeof(gf32.gf_numsrc)))
1082 return -EFAULT;
1083 return 0;
1084}
1085
1086int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1087 sockptr_t optval, sockptr_t optlen)
1088{
1089 struct ipv6_pinfo *np = inet6_sk(sk: sk);
1090 int len;
1091 int val;
1092
1093 if (ip6_mroute_opt(opt: optname))
1094 return ip6_mroute_getsockopt(sock: sk, optname, optval, optlen);
1095
1096 if (copy_from_sockptr(dst: &len, src: optlen, size: sizeof(int)))
1097 return -EFAULT;
1098 switch (optname) {
1099 case IPV6_ADDRFORM:
1100 if (sk->sk_protocol != IPPROTO_UDP &&
1101 sk->sk_protocol != IPPROTO_UDPLITE &&
1102 sk->sk_protocol != IPPROTO_TCP)
1103 return -ENOPROTOOPT;
1104 if (sk->sk_state != TCP_ESTABLISHED)
1105 return -ENOTCONN;
1106 val = sk->sk_family;
1107 break;
1108 case MCAST_MSFILTER:
1109 if (in_compat_syscall())
1110 return compat_ipv6_get_msfilter(sk, optval, optlen, len);
1111 return ipv6_get_msfilter(sk, optval, optlen, len);
1112 case IPV6_2292PKTOPTIONS:
1113 {
1114 struct msghdr msg;
1115 struct sk_buff *skb;
1116
1117 if (sk->sk_type != SOCK_STREAM)
1118 return -ENOPROTOOPT;
1119
1120 if (optval.is_kernel) {
1121 msg.msg_control_is_user = false;
1122 msg.msg_control = optval.kernel;
1123 } else {
1124 msg.msg_control_is_user = true;
1125 msg.msg_control_user = optval.user;
1126 }
1127 msg.msg_controllen = len;
1128 msg.msg_flags = 0;
1129
1130 sockopt_lock_sock(sk);
1131 skb = np->pktoptions;
1132 if (skb)
1133 ip6_datagram_recv_ctl(sk, msg: &msg, skb);
1134 sockopt_release_sock(sk);
1135 if (!skb) {
1136 if (np->rxopt.bits.rxinfo) {
1137 int mcast_oif = READ_ONCE(np->mcast_oif);
1138 struct in6_pktinfo src_info;
1139
1140 src_info.ipi6_ifindex = mcast_oif ? :
1141 np->sticky_pktinfo.ipi6_ifindex;
1142 src_info.ipi6_addr = mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1143 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, len: sizeof(src_info), data: &src_info);
1144 }
1145 if (np->rxopt.bits.rxhlim) {
1146 int hlim = READ_ONCE(np->mcast_hops);
1147
1148 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, len: sizeof(hlim), data: &hlim);
1149 }
1150 if (np->rxopt.bits.rxtclass) {
1151 int tclass = (int)ip6_tclass(flowinfo: np->rcv_flowinfo);
1152
1153 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, len: sizeof(tclass), data: &tclass);
1154 }
1155 if (np->rxopt.bits.rxoinfo) {
1156 int mcast_oif = READ_ONCE(np->mcast_oif);
1157 struct in6_pktinfo src_info;
1158
1159 src_info.ipi6_ifindex = mcast_oif ? :
1160 np->sticky_pktinfo.ipi6_ifindex;
1161 src_info.ipi6_addr = mcast_oif ? sk->sk_v6_daddr :
1162 np->sticky_pktinfo.ipi6_addr;
1163 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, len: sizeof(src_info), data: &src_info);
1164 }
1165 if (np->rxopt.bits.rxohlim) {
1166 int hlim = READ_ONCE(np->mcast_hops);
1167
1168 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, len: sizeof(hlim), data: &hlim);
1169 }
1170 if (np->rxopt.bits.rxflow) {
1171 __be32 flowinfo = np->rcv_flowinfo;
1172
1173 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, len: sizeof(flowinfo), data: &flowinfo);
1174 }
1175 }
1176 len -= msg.msg_controllen;
1177 return copy_to_sockptr(dst: optlen, src: &len, size: sizeof(int));
1178 }
1179 case IPV6_MTU:
1180 {
1181 struct dst_entry *dst;
1182
1183 val = 0;
1184 rcu_read_lock();
1185 dst = __sk_dst_get(sk);
1186 if (dst)
1187 val = dst_mtu(dst);
1188 rcu_read_unlock();
1189 if (!val)
1190 return -ENOTCONN;
1191 break;
1192 }
1193
1194 case IPV6_V6ONLY:
1195 val = sk->sk_ipv6only;
1196 break;
1197
1198 case IPV6_RECVPKTINFO:
1199 val = np->rxopt.bits.rxinfo;
1200 break;
1201
1202 case IPV6_2292PKTINFO:
1203 val = np->rxopt.bits.rxoinfo;
1204 break;
1205
1206 case IPV6_RECVHOPLIMIT:
1207 val = np->rxopt.bits.rxhlim;
1208 break;
1209
1210 case IPV6_2292HOPLIMIT:
1211 val = np->rxopt.bits.rxohlim;
1212 break;
1213
1214 case IPV6_RECVRTHDR:
1215 val = np->rxopt.bits.srcrt;
1216 break;
1217
1218 case IPV6_2292RTHDR:
1219 val = np->rxopt.bits.osrcrt;
1220 break;
1221
1222 case IPV6_HOPOPTS:
1223 case IPV6_RTHDRDSTOPTS:
1224 case IPV6_RTHDR:
1225 case IPV6_DSTOPTS:
1226 {
1227 struct ipv6_txoptions *opt;
1228
1229 sockopt_lock_sock(sk);
1230 opt = rcu_dereference_protected(np->opt,
1231 lockdep_sock_is_held(sk));
1232 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1233 sockopt_release_sock(sk);
1234 /* check if ipv6_getsockopt_sticky() returns err code */
1235 if (len < 0)
1236 return len;
1237 return copy_to_sockptr(dst: optlen, src: &len, size: sizeof(int));
1238 }
1239
1240 case IPV6_RECVHOPOPTS:
1241 val = np->rxopt.bits.hopopts;
1242 break;
1243
1244 case IPV6_2292HOPOPTS:
1245 val = np->rxopt.bits.ohopopts;
1246 break;
1247
1248 case IPV6_RECVDSTOPTS:
1249 val = np->rxopt.bits.dstopts;
1250 break;
1251
1252 case IPV6_2292DSTOPTS:
1253 val = np->rxopt.bits.odstopts;
1254 break;
1255
1256 case IPV6_TCLASS:
1257 val = np->tclass;
1258 break;
1259
1260 case IPV6_RECVTCLASS:
1261 val = np->rxopt.bits.rxtclass;
1262 break;
1263
1264 case IPV6_FLOWINFO:
1265 val = np->rxopt.bits.rxflow;
1266 break;
1267
1268 case IPV6_RECVPATHMTU:
1269 val = np->rxopt.bits.rxpmtu;
1270 break;
1271
1272 case IPV6_PATHMTU:
1273 {
1274 struct dst_entry *dst;
1275 struct ip6_mtuinfo mtuinfo;
1276
1277 if (len < sizeof(mtuinfo))
1278 return -EINVAL;
1279
1280 len = sizeof(mtuinfo);
1281 memset(s: &mtuinfo, c: 0, n: sizeof(mtuinfo));
1282
1283 rcu_read_lock();
1284 dst = __sk_dst_get(sk);
1285 if (dst)
1286 mtuinfo.ip6m_mtu = dst_mtu(dst);
1287 rcu_read_unlock();
1288 if (!mtuinfo.ip6m_mtu)
1289 return -ENOTCONN;
1290
1291 if (copy_to_sockptr(dst: optlen, src: &len, size: sizeof(int)))
1292 return -EFAULT;
1293 if (copy_to_sockptr(dst: optval, src: &mtuinfo, size: len))
1294 return -EFAULT;
1295
1296 return 0;
1297 }
1298
1299 case IPV6_TRANSPARENT:
1300 val = inet_test_bit(TRANSPARENT, sk);
1301 break;
1302
1303 case IPV6_FREEBIND:
1304 val = inet_test_bit(FREEBIND, sk);
1305 break;
1306
1307 case IPV6_RECVORIGDSTADDR:
1308 val = np->rxopt.bits.rxorigdstaddr;
1309 break;
1310
1311 case IPV6_UNICAST_HOPS:
1312 case IPV6_MULTICAST_HOPS:
1313 {
1314 struct dst_entry *dst;
1315
1316 if (optname == IPV6_UNICAST_HOPS)
1317 val = READ_ONCE(np->hop_limit);
1318 else
1319 val = READ_ONCE(np->mcast_hops);
1320
1321 if (val < 0) {
1322 rcu_read_lock();
1323 dst = __sk_dst_get(sk);
1324 if (dst)
1325 val = ip6_dst_hoplimit(dst);
1326 rcu_read_unlock();
1327 }
1328
1329 if (val < 0)
1330 val = READ_ONCE(sock_net(sk)->ipv6.devconf_all->hop_limit);
1331 break;
1332 }
1333
1334 case IPV6_MULTICAST_LOOP:
1335 val = inet6_test_bit(MC6_LOOP, sk);
1336 break;
1337
1338 case IPV6_MULTICAST_IF:
1339 val = READ_ONCE(np->mcast_oif);
1340 break;
1341
1342 case IPV6_MULTICAST_ALL:
1343 val = inet6_test_bit(MC6_ALL, sk);
1344 break;
1345
1346 case IPV6_UNICAST_IF:
1347 val = (__force int)htonl((__u32) READ_ONCE(np->ucast_oif));
1348 break;
1349
1350 case IPV6_MTU_DISCOVER:
1351 val = READ_ONCE(np->pmtudisc);
1352 break;
1353
1354 case IPV6_RECVERR:
1355 val = inet6_test_bit(RECVERR6, sk);
1356 break;
1357
1358 case IPV6_FLOWINFO_SEND:
1359 val = inet6_test_bit(SNDFLOW, sk);
1360 break;
1361
1362 case IPV6_FLOWLABEL_MGR:
1363 {
1364 struct in6_flowlabel_req freq;
1365 int flags;
1366
1367 if (len < sizeof(freq))
1368 return -EINVAL;
1369
1370 if (copy_from_sockptr(dst: &freq, src: optval, size: sizeof(freq)))
1371 return -EFAULT;
1372
1373 if (freq.flr_action != IPV6_FL_A_GET)
1374 return -EINVAL;
1375
1376 len = sizeof(freq);
1377 flags = freq.flr_flags;
1378
1379 memset(s: &freq, c: 0, n: sizeof(freq));
1380
1381 val = ipv6_flowlabel_opt_get(sk, freq: &freq, flags);
1382 if (val < 0)
1383 return val;
1384
1385 if (copy_to_sockptr(dst: optlen, src: &len, size: sizeof(int)))
1386 return -EFAULT;
1387 if (copy_to_sockptr(dst: optval, src: &freq, size: len))
1388 return -EFAULT;
1389
1390 return 0;
1391 }
1392
1393 case IPV6_ADDR_PREFERENCES:
1394 {
1395 u8 srcprefs = READ_ONCE(np->srcprefs);
1396 val = 0;
1397
1398 if (srcprefs & IPV6_PREFER_SRC_TMP)
1399 val |= IPV6_PREFER_SRC_TMP;
1400 else if (srcprefs & IPV6_PREFER_SRC_PUBLIC)
1401 val |= IPV6_PREFER_SRC_PUBLIC;
1402 else {
1403 /* XXX: should we return system default? */
1404 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1405 }
1406
1407 if (srcprefs & IPV6_PREFER_SRC_COA)
1408 val |= IPV6_PREFER_SRC_COA;
1409 else
1410 val |= IPV6_PREFER_SRC_HOME;
1411 break;
1412 }
1413 case IPV6_MINHOPCOUNT:
1414 val = READ_ONCE(np->min_hopcount);
1415 break;
1416
1417 case IPV6_DONTFRAG:
1418 val = inet6_test_bit(DONTFRAG, sk);
1419 break;
1420
1421 case IPV6_AUTOFLOWLABEL:
1422 val = ip6_autoflowlabel(net: sock_net(sk), sk);
1423 break;
1424
1425 case IPV6_RECVFRAGSIZE:
1426 val = np->rxopt.bits.recvfragsize;
1427 break;
1428
1429 case IPV6_ROUTER_ALERT:
1430 val = inet6_test_bit(RTALERT, sk);
1431 break;
1432
1433 case IPV6_ROUTER_ALERT_ISOLATE:
1434 val = inet6_test_bit(RTALERT_ISOLATE, sk);
1435 break;
1436
1437 case IPV6_RECVERR_RFC4884:
1438 val = inet6_test_bit(RECVERR6_RFC4884, sk);
1439 break;
1440
1441 default:
1442 return -ENOPROTOOPT;
1443 }
1444 len = min_t(unsigned int, sizeof(int), len);
1445 if (copy_to_sockptr(dst: optlen, src: &len, size: sizeof(int)))
1446 return -EFAULT;
1447 if (copy_to_sockptr(dst: optval, src: &val, size: len))
1448 return -EFAULT;
1449 return 0;
1450}
1451
1452int ipv6_getsockopt(struct sock *sk, int level, int optname,
1453 char __user *optval, int __user *optlen)
1454{
1455 int err;
1456
1457 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1458 return ip_getsockopt(sk, level, optname, optval, optlen);
1459
1460 if (level != SOL_IPV6)
1461 return -ENOPROTOOPT;
1462
1463 err = do_ipv6_getsockopt(sk, level, optname,
1464 optval: USER_SOCKPTR(p: optval), optlen: USER_SOCKPTR(p: optlen));
1465#ifdef CONFIG_NETFILTER
1466 /* we need to exclude all possible ENOPROTOOPTs except default case */
1467 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1468 int len;
1469
1470 if (get_user(len, optlen))
1471 return -EFAULT;
1472
1473 err = nf_getsockopt(sk, PF_INET6, optval: optname, opt: optval, len: &len);
1474 if (err >= 0)
1475 err = put_user(len, optlen);
1476 }
1477#endif
1478 return err;
1479}
1480EXPORT_SYMBOL(ipv6_getsockopt);
1481