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tcp/udp: Fix memory leak in ipv6_renew_options().
[linux-block.git] / net / ipv6 / ipv6_sockglue.c
CommitLineData
2874c5fd 1// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4
LT		 2/*
3 * IPv6 BSD socket options interface
1ab1457c 4 * Linux INET6 implementation
1da177e4
LT		 5 *
6 * Authors:
1ab1457c 7 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 8 *
9 * Based on linux/net/ipv4/ip_sockglue.c
10 *
1da177e4
LT		 11 * FIXME: Make the setsockopt code POSIX compliant: That is
12 *
1da177e4
LT		 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>
4fc268d2 22#include <linux/capability.h>
1da177e4
LT		 23#include <linux/errno.h>
24#include <linux/types.h>
25#include <linux/socket.h>
26#include <linux/sockios.h>
1da177e4
LT		 27#include <linux/net.h>
28#include <linux/in6.h>
7bc570c8 29#include <linux/mroute6.h>
1da177e4
LT		 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>
5a0e3ad6 35#include <linux/slab.h>
1da177e4
LT		 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>
ba4e58ec 48#include <net/udplite.h>
1da177e4 49#include <net/xfrm.h>
dae50295 50#include <net/compat.h>
a149e7c7 51#include <net/seg6.h>
1da177e4 52
7c0f6ba6 53#include <linux/uaccess.h>
1da177e4 54
1da177e4
LT		 55struct ip6_ra_chain *ip6_ra_chain;
56DEFINE_RWLOCK(ip6_ra_lock);
57
790eb673
ED		 58DEFINE_STATIC_KEY_FALSE(ip6_min_hopcount);
59
725a8ff0 60int ip6_ra_control(struct sock *sk, int sel)
1da177e4
LT		 61{
62 struct ip6_ra_chain *ra, *new_ra, **rap;
63
64 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
c720c7e8 65 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
1717699c 66 return -ENOPROTOOPT;
1da177e4 67
67ba4152 68 new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
95baa60a
GZ		 69 if (sel >= 0 && !new_ra)
70 return -ENOMEM;
1da177e4
LT		 71
72 write_lock_bh(&ip6_ra_lock);
67ba4152 73 for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
1da177e4 74 if (ra->sk == sk) {
67ba4152 75 if (sel >= 0) {
1da177e4 76 write_unlock_bh(&ip6_ra_lock);
a51482bd 77 kfree(new_ra);
1da177e4
LT		 78 return -EADDRINUSE;
79 }
80
81 *rap = ra->next;
82 write_unlock_bh(&ip6_ra_lock);
83
1da177e4
LT		 84 sock_put(sk);
85 kfree(ra);
86 return 0;
87 }
88 }
63159f29 89 if (!new_ra) {
1da177e4
LT		 90 write_unlock_bh(&ip6_ra_lock);
91 return -ENOBUFS;
92 }
93 new_ra->sk = sk;
94 new_ra->sel = sel;
1da177e4
LT		 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
e7712f1a
YH		 102struct 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)) &&
c720c7e8 108 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
e7712f1a
YH		 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 }
e7712f1a 113 }
45f6fad8
ED		 114 opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
115 opt);
e7712f1a
YH		 116 sk_dst_reset(sk);
117
118 return opt;
119}
120
baf606d9
MRL		 121static bool setsockopt_needs_rtnl(int optname)
122{
123 switch (optname) {
8651be8f 124 case IPV6_ADDRFORM:
baf606d9
MRL		 125 case IPV6_ADD_MEMBERSHIP:
126 case IPV6_DROP_MEMBERSHIP:
c4a6853d
MRL		 127 case IPV6_JOIN_ANYCAST:
128 case IPV6_LEAVE_ANYCAST:
baf606d9
MRL		 129 case MCAST_JOIN_GROUP:
130 case MCAST_LEAVE_GROUP:
54ff9ef3
MRL		 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:
baf606d9
MRL		 136 return true;
137 }
138 return false;
139}
140
894cfbc0
CH		 141static int copy_group_source_from_sockptr(struct group_source_req *greqs,
142 sockptr_t optval, int optlen)
3021ad52
CH		 143{
144 if (in_compat_syscall()) {
145 struct compat_group_source_req gr32;
146
147 if (optlen < sizeof(gr32))
148 return -EINVAL;
894cfbc0 149 if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
3021ad52
CH		 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;
894cfbc0 157 if (copy_from_sockptr(greqs, optval, sizeof(*greqs)))
3021ad52
CH		 158 return -EFAULT;
159 }
160
161 return 0;
162}
163
fcfa0b09 164static int do_ipv6_mcast_group_source(struct sock *sk, int optname,
894cfbc0 165 sockptr_t optval, int optlen)
fcfa0b09 166{
3021ad52 167 struct group_source_req greqs;
fcfa0b09 168 int omode, add;
3021ad52
CH		 169 int ret;
170
894cfbc0 171 ret = copy_group_source_from_sockptr(&greqs, optval, optlen);
3021ad52
CH		 172 if (ret)
173 return ret;
fcfa0b09 174
3021ad52
CH		 175 if (greqs.gsr_group.ss_family != AF_INET6 ||
176 greqs.gsr_source.ss_family != AF_INET6)
fcfa0b09
AV		 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
3021ad52
CH		 189 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
190 retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
fcfa0b09
AV		 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 }
3021ad52 202 return ip6_mc_source(add, omode, sk, &greqs);
fcfa0b09
AV		 203}
204
894cfbc0 205static int ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
ca0e65eb
CH		 206 int optlen)
207{
208 struct group_filter *gsf;
209 int ret;
210
211 if (optlen < GROUP_FILTER_SIZE(0))
212 return -EINVAL;
7de6d09f 213 if (optlen > READ_ONCE(sysctl_optmem_max))
ca0e65eb
CH		 214 return -ENOBUFS;
215
894cfbc0 216 gsf = memdup_sockptr(optval, optlen);
ca0e65eb
CH		 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
db243b79 230 ret = ip6_mc_msfilter(sk, gsf, gsf->gf_slist_flex);
ca0e65eb
CH		 231out_free_gsf:
232 kfree(gsf);
233 return ret;
234}
235
894cfbc0 236static int compat_ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
ca0e65eb
CH		 237 int optlen)
238{
db243b79 239 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
ca0e65eb
CH		 240 struct compat_group_filter *gf32;
241 void *p;
242 int ret;
243 int n;
244
245 if (optlen < size0)
246 return -EINVAL;
7de6d09f 247 if (optlen > READ_ONCE(sysctl_optmem_max) - 4)
ca0e65eb
CH		 248 return -ENOBUFS;
249
250 p = kmalloc(optlen + 4, GFP_KERNEL);
251 if (!p)
252 return -ENOMEM;
253
db243b79 254 gf32 = p + 4; /* we want ->gf_group and ->gf_slist_flex aligned */
ca0e65eb 255 ret = -EFAULT;
894cfbc0 256 if (copy_from_sockptr(gf32, optval, optlen))
ca0e65eb
CH		 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;
db243b79 266 if (offsetof(struct compat_group_filter, gf_slist_flex[n]) > optlen)
ca0e65eb
CH		 267 goto out_free_p;
268
ca0e65eb
CH		 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,
db243b79 273 .gf_numsrc = gf32->gf_numsrc}, gf32->gf_slist_flex);
ca0e65eb
CH		 274
275out_free_p:
276 kfree(p);
277 return ret;
278}
ca0e65eb 279
fdf5bdd8 280static int ipv6_mcast_join_leave(struct sock *sk, int optname,
894cfbc0 281 sockptr_t optval, int optlen)
fdf5bdd8
CH		 282{
283 struct sockaddr_in6 *psin6;
284 struct group_req greq;
285
286 if (optlen < sizeof(greq))
287 return -EINVAL;
894cfbc0 288 if (copy_from_sockptr(&greq, optval, sizeof(greq)))
fdf5bdd8
CH		 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
fdf5bdd8 300static int compat_ipv6_mcast_join_leave(struct sock *sk, int optname,
894cfbc0 301 sockptr_t optval, int optlen)
fdf5bdd8
CH		 302{
303 struct compat_group_req gr32;
304 struct sockaddr_in6 *psin6;
fdf5bdd8
CH		 305
306 if (optlen < sizeof(gr32))
307 return -EINVAL;
894cfbc0 308 if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
fdf5bdd8
CH		 309 return -EFAULT;
310
311 if (gr32.gr_group.ss_family != AF_INET6)
312 return -EADDRNOTAVAIL;
fdf5bdd8
CH		 313 psin6 = (struct sockaddr_in6 *)&gr32.gr_group;
314 if (optname == MCAST_JOIN_GROUP)
3021ad52 315 return ipv6_sock_mc_join(sk, gr32.gr_interface,
fdf5bdd8 316 &psin6->sin6_addr);
3021ad52 317 return ipv6_sock_mc_drop(sk, gr32.gr_interface, &psin6->sin6_addr);
fdf5bdd8 318}
fdf5bdd8 319
894cfbc0 320static int ipv6_set_opt_hdr(struct sock *sk, int optname, sockptr_t optval,
b84d2b73
CH		 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 */
40cd308e 330 if (optname != IPV6_RTHDR && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW))
b84d2b73
CH		 331 return -EPERM;
332
333 /* remove any sticky options header with a zero option
334 * length, per RFC3542.
335 */
336 if (optlen > 0) {
894cfbc0 337 if (sockptr_is_null(optval))
b84d2b73
CH		 338 return -EINVAL;
339 if (optlen < sizeof(struct ipv6_opt_hdr) ||
340 optlen & 0x7 ||
341 optlen > 8 * 255)
342 return -EINVAL;
343
894cfbc0 344 new = memdup_sockptr(optval, optlen);
b84d2b73
CH		 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);
386sticky_done:
387 if (opt) {
388 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
389 txopt_put(opt);
390 }
391 return err;
392}
393
75b64b68
MKL		 394int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
395 sockptr_t optval, unsigned int optlen)
1da177e4
LT		 396{
397 struct ipv6_pinfo *np = inet6_sk(sk);
3b1e0a65 398 struct net *net = sock_net(sk);
1da177e4
LT		 399 int val, valbool;
400 int retv = -ENOPROTOOPT;
baf606d9 401 bool needs_rtnl = setsockopt_needs_rtnl(optname);
1da177e4 402
894cfbc0 403 if (sockptr_is_null(optval))
67ba4152 404 val = 0;
b2a9d7c2
YH		 405 else {
406 if (optlen >= sizeof(int)) {
894cfbc0 407 if (copy_from_sockptr(&val, optval, sizeof(val)))
b2a9d7c2
YH		 408 return -EFAULT;
409 } else
410 val = 0;
411 }
1da177e4 412
67ba4152 413 valbool = (val != 0);
1da177e4 414
7bc570c8 415 if (ip6_mroute_opt(optname))
894cfbc0 416 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
7bc570c8 417
baf606d9
MRL		 418 if (needs_rtnl)
419 rtnl_lock();
40cd308e 420 sockopt_lock_sock(sk);
1da177e4 421
3c52c6bb
KI		 422 /* Another thread has converted the socket into IPv4 with
423 * IPV6_ADDRFORM concurrently.
424 */
425 if (unlikely(sk->sk_family != AF_INET6))
426 goto unlock;
427
1da177e4
LT		 428 switch (optname) {
429
430 case IPV6_ADDRFORM:
b2a9d7c2
YH		 431 if (optlen < sizeof(int))
432 goto e_inval;
1da177e4
LT		 433 if (val == PF_INET) {
434 struct ipv6_txoptions *opt;
435 struct sk_buff *pktopt;
436
49d074f4
DL		 437 if (sk->sk_type == SOCK_RAW)
438 break;
439
9596cc82
DL		 440 if (sk->sk_protocol == IPPROTO_UDP ||
441 sk->sk_protocol == IPPROTO_UDPLITE) {
442 struct udp_sock *up = udp_sk(sk);
443 if (up->pending == AF_INET6) {
444 retv = -EBUSY;
445 break;
446 }
79a1f0cc
HL		 447 } else if (sk->sk_protocol == IPPROTO_TCP) {
448 if (sk->sk_prot != &tcpv6_prot) {
449 retv = -EBUSY;
450 break;
451 }
452 } else {
b6f61189
ED		 453 break;
454 }
79a1f0cc 455
1da177e4
LT		 456 if (sk->sk_state != TCP_ESTABLISHED) {
457 retv = -ENOTCONN;
458 break;
459 }
460
461 if (ipv6_only_sock(sk) ||
efe4208f 462 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
1da177e4
LT		 463 retv = -EADDRNOTAVAIL;
464 break;
465 }
466
467 fl6_free_socklist(sk);
8651be8f 468 __ipv6_sock_mc_close(sk);
8c0de6e9 469 __ipv6_sock_ac_close(sk);
1da177e4 470
e6848976
ACM		 471 /*
472 * Sock is moving from IPv6 to IPv4 (sk_prot), so
473 * remove it from the refcnt debug socks count in the
474 * original family...
475 */
476 sk_refcnt_debug_dec(sk);
477
1da177e4 478 if (sk->sk_protocol == IPPROTO_TCP) {
d83d8461 479 struct inet_connection_sock *icsk = inet_csk(sk);
b3cb764a 480
c29a0bc4
PE		 481 sock_prot_inuse_add(net, sk->sk_prot, -1);
482 sock_prot_inuse_add(net, &tcp_prot, 1);
b3cb764a 483
086d4905
ED		 484 /* Paired with READ_ONCE(sk->sk_prot) in net/ipv6/af_inet6.c */
485 WRITE_ONCE(sk->sk_prot, &tcp_prot);
d83d8461 486 icsk->icsk_af_ops = &ipv4_specific;
1da177e4
LT		 487 sk->sk_socket->ops = &inet_stream_ops;
488 sk->sk_family = PF_INET;
d83d8461 489 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
1da177e4 490 } else {
ba4e58ec
GR		 491 struct proto *prot = &udp_prot;
492
db8dac20 493 if (sk->sk_protocol == IPPROTO_UDPLITE)
ba4e58ec 494 prot = &udplite_prot;
b3cb764a 495
c29a0bc4
PE		 496 sock_prot_inuse_add(net, sk->sk_prot, -1);
497 sock_prot_inuse_add(net, prot, 1);
b3cb764a 498
086d4905
ED		 499 /* Paired with READ_ONCE(sk->sk_prot) in net/ipv6/af_inet6.c */
500 WRITE_ONCE(sk->sk_prot, prot);
1da177e4
LT		 501 sk->sk_socket->ops = &inet_dgram_ops;
502 sk->sk_family = PF_INET;
503 }
45f6fad8
ED		 504 opt = xchg((__force struct ipv6_txoptions **)&np->opt,
505 NULL);
506 if (opt) {
507 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
508 txopt_put(opt);
509 }
1da177e4 510 pktopt = xchg(&np->pktoptions, NULL);
800d55f1 511 kfree_skb(pktopt);
1da177e4 512
e6848976
ACM		 513 /*
514 * ... and add it to the refcnt debug socks count
515 * in the new family. -acme
516 */
517 sk_refcnt_debug_inc(sk);
1da177e4
LT		 518 module_put(THIS_MODULE);
519 retv = 0;
520 break;
521 }
522 goto e_inval;
523
524 case IPV6_V6ONLY:
b2a9d7c2 525 if (optlen < sizeof(int) ||
c720c7e8 526 inet_sk(sk)->inet_num)
1da177e4 527 goto e_inval;
9fe516ba 528 sk->sk_ipv6only = valbool;
1da177e4
LT		 529 retv = 0;
530 break;
531
333fad53 532 case IPV6_RECVPKTINFO:
b2a9d7c2
YH		 533 if (optlen < sizeof(int))
534 goto e_inval;
1da177e4
LT		 535 np->rxopt.bits.rxinfo = valbool;
536 retv = 0;
537 break;
1ab1457c 538
333fad53 539 case IPV6_2292PKTINFO:
b2a9d7c2
YH		 540 if (optlen < sizeof(int))
541 goto e_inval;
333fad53
YH		 542 np->rxopt.bits.rxoinfo = valbool;
543 retv = 0;
544 break;
1da177e4 545
333fad53 546 case IPV6_RECVHOPLIMIT:
b2a9d7c2
YH		 547 if (optlen < sizeof(int))
548 goto e_inval;
1da177e4
LT		 549 np->rxopt.bits.rxhlim = valbool;
550 retv = 0;
551 break;
552
333fad53 553 case IPV6_2292HOPLIMIT:
b2a9d7c2
YH		 554 if (optlen < sizeof(int))
555 goto e_inval;
333fad53
YH		 556 np->rxopt.bits.rxohlim = valbool;
557 retv = 0;
558 break;
559
560 case IPV6_RECVRTHDR:
b2a9d7c2
YH		 561 if (optlen < sizeof(int))
562 goto e_inval;
4c752098 563 np->rxopt.bits.srcrt = valbool;
1da177e4
LT		 564 retv = 0;
565 break;
566
333fad53 567 case IPV6_2292RTHDR:
b2a9d7c2
YH		 568 if (optlen < sizeof(int))
569 goto e_inval;
4c752098 570 np->rxopt.bits.osrcrt = valbool;
333fad53
YH		 571 retv = 0;
572 break;
573
574 case IPV6_RECVHOPOPTS:
b2a9d7c2
YH		 575 if (optlen < sizeof(int))
576 goto e_inval;
1da177e4
LT		 577 np->rxopt.bits.hopopts = valbool;
578 retv = 0;
579 break;
580
333fad53 581 case IPV6_2292HOPOPTS:
b2a9d7c2
YH		 582 if (optlen < sizeof(int))
583 goto e_inval;
333fad53
YH		 584 np->rxopt.bits.ohopopts = valbool;
585 retv = 0;
586 break;
587
588 case IPV6_RECVDSTOPTS:
b2a9d7c2
YH		 589 if (optlen < sizeof(int))
590 goto e_inval;
1da177e4
LT		 591 np->rxopt.bits.dstopts = valbool;
592 retv = 0;
593 break;
594
333fad53 595 case IPV6_2292DSTOPTS:
b2a9d7c2
YH		 596 if (optlen < sizeof(int))
597 goto e_inval;
333fad53
YH		 598 np->rxopt.bits.odstopts = valbool;
599 retv = 0;
600 break;
601
41a1f8ea 602 case IPV6_TCLASS:
b2a9d7c2
YH		 603 if (optlen < sizeof(int))
604 goto e_inval;
d0ee011f 605 if (val < -1 || val > 0xff)
41a1f8ea 606 goto e_inval;
26ced1e4
GR		 607 /* RFC 3542, 6.5: default traffic class of 0x0 */
608 if (val == -1)
609 val = 0;
9f7b3a69
MŻ		 610 if (sk->sk_type == SOCK_STREAM) {
611 val &= ~INET_ECN_MASK;
612 val |= np->tclass & INET_ECN_MASK;
613 }
305e95bb
MŻ		 614 if (np->tclass != val) {
615 np->tclass = val;
616 sk_dst_reset(sk);
617 }
41a1f8ea
YH		 618 retv = 0;
619 break;
1ab1457c 620
41a1f8ea 621 case IPV6_RECVTCLASS:
b2a9d7c2
YH		 622 if (optlen < sizeof(int))
623 goto e_inval;
41a1f8ea
YH		 624 np->rxopt.bits.rxtclass = valbool;
625 retv = 0;
626 break;
627
1da177e4 628 case IPV6_FLOWINFO:
b2a9d7c2
YH		 629 if (optlen < sizeof(int))
630 goto e_inval;
1da177e4
LT		 631 np->rxopt.bits.rxflow = valbool;
632 retv = 0;
633 break;
634
793b1473
BH		 635 case IPV6_RECVPATHMTU:
636 if (optlen < sizeof(int))
637 goto e_inval;
638 np->rxopt.bits.rxpmtu = valbool;
639 retv = 0;
640 break;
641
6c468622 642 case IPV6_TRANSPARENT:
40cd308e
MKL		 643 if (valbool && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW) &&
644 !sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) {
b889416b
BS		 645 retv = -EPERM;
646 break;
647 }
6c468622
BS		 648 if (optlen < sizeof(int))
649 goto e_inval;
650 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
651 inet_sk(sk)->transparent = valbool;
652 retv = 0;
653 break;
654
84e14fe3
MŻ		 655 case IPV6_FREEBIND:
656 if (optlen < sizeof(int))
657 goto e_inval;
658 /* we also don't have a separate freebind bit for IPV6 */
659 inet_sk(sk)->freebind = valbool;
660 retv = 0;
661 break;
662
6c468622
BS		 663 case IPV6_RECVORIGDSTADDR:
664 if (optlen < sizeof(int))
665 goto e_inval;
666 np->rxopt.bits.rxorigdstaddr = valbool;
667 retv = 0;
668 break;
669
333fad53
YH		 670 case IPV6_HOPOPTS:
671 case IPV6_RTHDRDSTOPTS:
672 case IPV6_RTHDR:
673 case IPV6_DSTOPTS:
b84d2b73 674 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen);
333fad53 675 break;
333fad53 676
b24a2516
YH		 677 case IPV6_PKTINFO:
678 {
679 struct in6_pktinfo pkt;
680
681 if (optlen == 0)
682 goto e_inval;
894cfbc0
CH		 683 else if (optlen < sizeof(struct in6_pktinfo) ||
684 sockptr_is_null(optval))
b24a2516
YH		 685 goto e_inval;
686
894cfbc0
CH		 687 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) {
688 retv = -EFAULT;
689 break;
b24a2516 690 }
d839a0eb 691 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
b24a2516
YH		 692 goto e_inval;
693
694 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
4e3fd7a0 695 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
b24a2516
YH		 696 retv = 0;
697 break;
698 }
699
333fad53 700 case IPV6_2292PKTOPTIONS:
1da177e4
LT		 701 {
702 struct ipv6_txoptions *opt = NULL;
703 struct msghdr msg;
4c9483b2 704 struct flowi6 fl6;
26879da5 705 struct ipcm6_cookie ipc6;
1da177e4 706
4c9483b2
DM		 707 memset(&fl6, 0, sizeof(fl6));
708 fl6.flowi6_oif = sk->sk_bound_dev_if;
709 fl6.flowi6_mark = sk->sk_mark;
1da177e4
LT		 710
711 if (optlen == 0)
712 goto update;
713
714 /* 1K is probably excessive
715 * 1K is surely not enough, 2K per standard header is 16K.
716 */
717 retv = -EINVAL;
718 if (optlen > 64*1024)
719 break;
720
721 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
722 retv = -ENOBUFS;
63159f29 723 if (!opt)
1da177e4
LT		 724 break;
725
726 memset(opt, 0, sizeof(*opt));
0aeea21a 727 refcount_set(&opt->refcnt, 1);
1da177e4
LT		 728 opt->tot_len = sizeof(*opt) + optlen;
729 retv = -EFAULT;
894cfbc0 730 if (copy_from_sockptr(opt + 1, optval, optlen))
1da177e4
LT		 731 goto done;
732
733 msg.msg_controllen = optlen;
67ba4152 734 msg.msg_control = (void *)(opt+1);
26879da5 735 ipc6.opt = opt;
1da177e4 736
5fdaa88d 737 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
1da177e4
LT		 738 if (retv)
739 goto done;
740update:
741 retv = 0;
e7712f1a 742 opt = ipv6_update_options(sk, opt);
1da177e4 743done:
45f6fad8
ED		 744 if (opt) {
745 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
746 txopt_put(opt);
747 }
1da177e4
LT		 748 break;
749 }
750 case IPV6_UNICAST_HOPS:
b2a9d7c2
YH		 751 if (optlen < sizeof(int))
752 goto e_inval;
1da177e4
LT		 753 if (val > 255 || val < -1)
754 goto e_inval;
755 np->hop_limit = val;
756 retv = 0;
757 break;
758
759 case IPV6_MULTICAST_HOPS:
760 if (sk->sk_type == SOCK_STREAM)
1717699c 761 break;
b2a9d7c2
YH		 762 if (optlen < sizeof(int))
763 goto e_inval;
1da177e4
LT		 764 if (val > 255 || val < -1)
765 goto e_inval;
2a38e6d5 766 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
1da177e4
LT		 767 retv = 0;
768 break;
769
770 case IPV6_MULTICAST_LOOP:
b2a9d7c2
YH		 771 if (optlen < sizeof(int))
772 goto e_inval;
28d44882
YH		 773 if (val != valbool)
774 goto e_inval;
1da177e4
LT		 775 np->mc_loop = valbool;
776 retv = 0;
777 break;
778
c4062dfc
EH		 779 case IPV6_UNICAST_IF:
780 {
781 struct net_device *dev = NULL;
782 int ifindex;
783
784 if (optlen != sizeof(int))
785 goto e_inval;
786
787 ifindex = (__force int)ntohl((__force __be32)val);
788 if (ifindex == 0) {
789 np->ucast_oif = 0;
790 retv = 0;
791 break;
792 }
793
794 dev = dev_get_by_index(net, ifindex);
795 retv = -EADDRNOTAVAIL;
796 if (!dev)
797 break;
798 dev_put(dev);
799
800 retv = -EINVAL;
801 if (sk->sk_bound_dev_if)
802 break;
803
804 np->ucast_oif = ifindex;
805 retv = 0;
806 break;
807 }
808
1da177e4
LT		 809 case IPV6_MULTICAST_IF:
810 if (sk->sk_type == SOCK_STREAM)
1717699c 811 break;
b2a9d7c2
YH		 812 if (optlen < sizeof(int))
813 goto e_inval;
1da177e4 814
4953f0fc 815 if (val) {
55b80503 816 struct net_device *dev;
7bb387c5 817 int midx;
55b80503 818
7bb387c5 819 rcu_read_lock();
4953f0fc 820
7bb387c5 821 dev = dev_get_by_index_rcu(net, val);
55b80503 822 if (!dev) {
7bb387c5 823 rcu_read_unlock();
4953f0fc
BH		 824 retv = -ENODEV;
825 break;
826 }
7bb387c5
DA		 827 midx = l3mdev_master_ifindex_rcu(dev);
828
829 rcu_read_unlock();
830
831 if (sk->sk_bound_dev_if &&
832 sk->sk_bound_dev_if != val &&
833 (!midx || midx != sk->sk_bound_dev_if))
834 goto e_inval;
1da177e4
LT		 835 }
836 np->mcast_oif = val;
837 retv = 0;
838 break;
839 case IPV6_ADD_MEMBERSHIP:
840 case IPV6_DROP_MEMBERSHIP:
841 {
842 struct ipv6_mreq mreq;
843
a28398ba
WC		 844 if (optlen < sizeof(struct ipv6_mreq))
845 goto e_inval;
846
a96fb49b
FL		 847 retv = -EPROTO;
848 if (inet_sk(sk)->is_icsk)
849 break;
850
1da177e4 851 retv = -EFAULT;
894cfbc0 852 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
1da177e4
LT		 853 break;
854
855 if (optname == IPV6_ADD_MEMBERSHIP)
54ff9ef3 856 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
1da177e4 857 else
54ff9ef3 858 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
1da177e4
LT		 859 break;
860 }
861 case IPV6_JOIN_ANYCAST:
862 case IPV6_LEAVE_ANYCAST:
863 {
864 struct ipv6_mreq mreq;
865
a28398ba 866 if (optlen < sizeof(struct ipv6_mreq))
1da177e4
LT		 867 goto e_inval;
868
869 retv = -EFAULT;
894cfbc0 870 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
1da177e4
LT		 871 break;
872
873 if (optname == IPV6_JOIN_ANYCAST)
874 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
875 else
876 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
877 break;
878 }
15033f04
AN		 879 case IPV6_MULTICAST_ALL:
880 if (optlen < sizeof(int))
881 goto e_inval;
882 np->mc_all = valbool;
883 retv = 0;
884 break;
885
1da177e4
LT		 886 case MCAST_JOIN_GROUP:
887 case MCAST_LEAVE_GROUP:
3021ad52
CH		 888 if (in_compat_syscall())
889 retv = compat_ipv6_mcast_join_leave(sk, optname, optval,
890 optlen);
891 else
892 retv = ipv6_mcast_join_leave(sk, optname, optval,
893 optlen);
1da177e4 894 break;
1da177e4
LT		 895 case MCAST_JOIN_SOURCE_GROUP:
896 case MCAST_LEAVE_SOURCE_GROUP:
897 case MCAST_BLOCK_SOURCE:
898 case MCAST_UNBLOCK_SOURCE:
3021ad52 899 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen);
1da177e4 900 break;
1da177e4 901 case MCAST_MSFILTER:
3021ad52
CH		 902 if (in_compat_syscall())
903 retv = compat_ipv6_set_mcast_msfilter(sk, optval,
904 optlen);
905 else
906 retv = ipv6_set_mcast_msfilter(sk, optval, optlen);
1da177e4 907 break;
1da177e4 908 case IPV6_ROUTER_ALERT:
b2a9d7c2
YH		 909 if (optlen < sizeof(int))
910 goto e_inval;
725a8ff0 911 retv = ip6_ra_control(sk, val);
1da177e4 912 break;
9036b2fe
FR		 913 case IPV6_ROUTER_ALERT_ISOLATE:
914 if (optlen < sizeof(int))
915 goto e_inval;
916 np->rtalert_isolate = valbool;
917 retv = 0;
918 break;
1da177e4 919 case IPV6_MTU_DISCOVER:
b2a9d7c2
YH		 920 if (optlen < sizeof(int))
921 goto e_inval;
0b95227a 922 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
1da177e4
LT		 923 goto e_inval;
924 np->pmtudisc = val;
925 retv = 0;
926 break;
927 case IPV6_MTU:
b2a9d7c2
YH		 928 if (optlen < sizeof(int))
929 goto e_inval;
1da177e4
LT		 930 if (val && val < IPV6_MIN_MTU)
931 goto e_inval;
932 np->frag_size = val;
933 retv = 0;
934 break;
935 case IPV6_RECVERR:
b2a9d7c2
YH		 936 if (optlen < sizeof(int))
937 goto e_inval;
1da177e4
LT		 938 np->recverr = valbool;
939 if (!val)
940 skb_queue_purge(&sk->sk_error_queue);
941 retv = 0;
942 break;
943 case IPV6_FLOWINFO_SEND:
b2a9d7c2
YH		 944 if (optlen < sizeof(int))
945 goto e_inval;
1da177e4
LT		 946 np->sndflow = valbool;
947 retv = 0;
948 break;
949 case IPV6_FLOWLABEL_MGR:
894cfbc0 950 retv = ipv6_flowlabel_opt(sk, optval, optlen);
1da177e4
LT		 951 break;
952 case IPV6_IPSEC_POLICY:
953 case IPV6_XFRM_POLICY:
6fc0b4a7 954 retv = -EPERM;
40cd308e 955 if (!sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN))
6fc0b4a7 956 break;
894cfbc0 957 retv = xfrm_user_policy(sk, optname, optval, optlen);
1da177e4
LT		 958 break;
959
7cbca67c 960 case IPV6_ADDR_PREFERENCES:
b2a9d7c2
YH		 961 if (optlen < sizeof(int))
962 goto e_inval;
18d5ad62 963 retv = __ip6_sock_set_addr_preferences(sk, val);
7cbca67c 964 break;
e802af9c
SH		 965 case IPV6_MINHOPCOUNT:
966 if (optlen < sizeof(int))
967 goto e_inval;
968 if (val < 0 || val > 255)
969 goto e_inval;
790eb673
ED		 970
971 if (val)
972 static_branch_enable(&ip6_min_hopcount);
973
cc17c3c8
ED		 974 /* tcp_v6_err() and tcp_v6_rcv() might read min_hopcount
975 * while we are changing it.
976 */
977 WRITE_ONCE(np->min_hopcount, val);
d4596bad 978 retv = 0;
793b1473
BH		 979 break;
980 case IPV6_DONTFRAG:
981 np->dontfrag = valbool;
e802af9c
SH		 982 retv = 0;
983 break;
cb1ce2ef
TH		 984 case IPV6_AUTOFLOWLABEL:
985 np->autoflowlabel = valbool;
513674b5 986 np->autoflowlabel_set = 1;
cb1ce2ef
TH		 987 retv = 0;
988 break;
0cc0aa61
WB		 989 case IPV6_RECVFRAGSIZE:
990 np->rxopt.bits.recvfragsize = valbool;
991 retv = 0;
992 break;
01370434
WB		 993 case IPV6_RECVERR_RFC4884:
994 if (optlen < sizeof(int))
995 goto e_inval;
996 if (val < 0 || val > 1)
997 goto e_inval;
998 np->recverr_rfc4884 = valbool;
999 retv = 0;
1000 break;
1da177e4 1001 }
7cbca67c 1002
3c52c6bb 1003unlock:
40cd308e 1004 sockopt_release_sock(sk);
baf606d9
MRL		 1005 if (needs_rtnl)
1006 rtnl_unlock();
1da177e4 1007
1da177e4
LT		 1008 return retv;
1009
1010e_inval:
40cd308e 1011 sockopt_release_sock(sk);
baf606d9
MRL		 1012 if (needs_rtnl)
1013 rtnl_unlock();
1da177e4
LT		 1014 return -EINVAL;
1015}
1016
a7b75c5a
CH		 1017int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1018 unsigned int optlen)
3fdadf7d
DM		 1019{
1020 int err;
1021
1022 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1023 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
1024
1025 if (level != SOL_IPV6)
1026 return -ENOPROTOOPT;
1027
a7b75c5a 1028 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
3fdadf7d
DM		 1029#ifdef CONFIG_NETFILTER
1030 /* we need to exclude all possible ENOPROTOOPTs except default case */
1031 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
3f34cfae 1032 optname != IPV6_XFRM_POLICY)
a7b75c5a 1033 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
3fdadf7d
DM		 1034#endif
1035 return err;
1036}
7159039a 1037EXPORT_SYMBOL(ipv6_setsockopt);
3fdadf7d 1038
28693079 1039static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
6dadbe4b 1040 int optname, sockptr_t optval, int len)
333fad53 1041{
28693079
DM		 1042 struct ipv6_opt_hdr *hdr;
1043
4c6510a7
YH		 1044 if (!opt)
1045 return 0;
1046
67ba4152 1047 switch (optname) {
4c6510a7
YH		 1048 case IPV6_HOPOPTS:
1049 hdr = opt->hopopt;
1050 break;
1051 case IPV6_RTHDRDSTOPTS:
1052 hdr = opt->dst0opt;
1053 break;
1054 case IPV6_RTHDR:
1055 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1056 break;
1057 case IPV6_DSTOPTS:
1058 hdr = opt->dst1opt;
1059 break;
1060 default:
1061 return -EINVAL; /* should not happen */
1062 }
1063
1064 if (!hdr)
333fad53 1065 return 0;
28693079 1066
d2b02ed9 1067 len = min_t(unsigned int, len, ipv6_optlen(hdr));
6dadbe4b 1068 if (copy_to_sockptr(optval, hdr, len))
333fad53 1069 return -EFAULT;
95b496b6 1070 return len;
333fad53
YH		 1071}
1072
6dadbe4b
MKL		 1073static int ipv6_get_msfilter(struct sock *sk, sockptr_t optval,
1074 sockptr_t optlen, int len)
d5541e85 1075{
db243b79 1076 const int size0 = offsetof(struct group_filter, gf_slist_flex);
d5541e85
CH		 1077 struct group_filter gsf;
1078 int num;
1079 int err;
1080
1081 if (len < size0)
1082 return -EINVAL;
6dadbe4b 1083 if (copy_from_sockptr(&gsf, optval, size0))
d5541e85
CH		 1084 return -EFAULT;
1085 if (gsf.gf_group.ss_family != AF_INET6)
1086 return -EADDRNOTAVAIL;
1087 num = gsf.gf_numsrc;
0f95f7d4 1088 sockopt_lock_sock(sk);
6dadbe4b 1089 err = ip6_mc_msfget(sk, &gsf, optval, size0);
d5541e85
CH		 1090 if (!err) {
1091 if (num > gsf.gf_numsrc)
1092 num = gsf.gf_numsrc;
6dadbe4b
MKL		 1093 len = GROUP_FILTER_SIZE(num);
1094 if (copy_to_sockptr(optlen, &len, sizeof(int)) ||
1095 copy_to_sockptr(optval, &gsf, size0))
d5541e85
CH		 1096 err = -EFAULT;
1097 }
0f95f7d4 1098 sockopt_release_sock(sk);
d5541e85
CH		 1099 return err;
1100}
1101
6dadbe4b
MKL		 1102static int compat_ipv6_get_msfilter(struct sock *sk, sockptr_t optval,
1103 sockptr_t optlen, int len)
d5541e85 1104{
db243b79 1105 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
d5541e85
CH		 1106 struct compat_group_filter gf32;
1107 struct group_filter gf;
9c3f9707 1108 int err;
d5541e85
CH		 1109 int num;
1110
d5541e85
CH		 1111 if (len < size0)
1112 return -EINVAL;
1113
6dadbe4b 1114 if (copy_from_sockptr(&gf32, optval, size0))
d5541e85
CH		 1115 return -EFAULT;
1116 gf.gf_interface = gf32.gf_interface;
1117 gf.gf_fmode = gf32.gf_fmode;
1118 num = gf.gf_numsrc = gf32.gf_numsrc;
1119 gf.gf_group = gf32.gf_group;
1120
1121 if (gf.gf_group.ss_family != AF_INET6)
1122 return -EADDRNOTAVAIL;
1123
0f95f7d4 1124 sockopt_lock_sock(sk);
6dadbe4b 1125 err = ip6_mc_msfget(sk, &gf, optval, size0);
0f95f7d4 1126 sockopt_release_sock(sk);
d5541e85
CH		 1127 if (err)
1128 return err;
1129 if (num > gf.gf_numsrc)
1130 num = gf.gf_numsrc;
1131 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32));
6dadbe4b
MKL		 1132 if (copy_to_sockptr(optlen, &len, sizeof(int)) ||
1133 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_fmode),
1134 &gf.gf_fmode, sizeof(gf32.gf_fmode)) ||
1135 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_numsrc),
1136 &gf.gf_numsrc, sizeof(gf32.gf_numsrc)))
d5541e85
CH		 1137 return -EFAULT;
1138 return 0;
1139}
d5541e85 1140
38566ec0
MKL		 1141int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1142 sockptr_t optval, sockptr_t optlen)
1da177e4
LT		 1143{
1144 struct ipv6_pinfo *np = inet6_sk(sk);
1145 int len;
1146 int val;
1147
7bc570c8
YH		 1148 if (ip6_mroute_opt(optname))
1149 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1150
6dadbe4b 1151 if (copy_from_sockptr(&len, optlen, sizeof(int)))
1da177e4
LT		 1152 return -EFAULT;
1153 switch (optname) {
1154 case IPV6_ADDRFORM:
1155 if (sk->sk_protocol != IPPROTO_UDP &&
ba4e58ec 1156 sk->sk_protocol != IPPROTO_UDPLITE &&
1da177e4 1157 sk->sk_protocol != IPPROTO_TCP)
1717699c 1158 return -ENOPROTOOPT;
1da177e4
LT		 1159 if (sk->sk_state != TCP_ESTABLISHED)
1160 return -ENOTCONN;
1161 val = sk->sk_family;
1162 break;
1163 case MCAST_MSFILTER:
3021ad52 1164 if (in_compat_syscall())
9c3f9707 1165 return compat_ipv6_get_msfilter(sk, optval, optlen, len);
d5541e85 1166 return ipv6_get_msfilter(sk, optval, optlen, len);
333fad53 1167 case IPV6_2292PKTOPTIONS:
1da177e4
LT		 1168 {
1169 struct msghdr msg;
1170 struct sk_buff *skb;
1171
1172 if (sk->sk_type != SOCK_STREAM)
1173 return -ENOPROTOOPT;
1174
6dadbe4b
MKL		 1175 if (optval.is_kernel) {
1176 msg.msg_control_is_user = false;
1177 msg.msg_control = optval.kernel;
1178 } else {
1179 msg.msg_control_is_user = true;
1180 msg.msg_control_user = optval.user;
1181 }
1da177e4 1182 msg.msg_controllen = len;
75f23979 1183 msg.msg_flags = 0;
1da177e4 1184
0f95f7d4 1185 sockopt_lock_sock(sk);
1da177e4
LT		 1186 skb = np->pktoptions;
1187 if (skb)
4b261c75 1188 ip6_datagram_recv_ctl(sk, &msg, skb);
0f95f7d4 1189 sockopt_release_sock(sk);
1dc7b90f 1190 if (!skb) {
1da177e4
LT		 1191 if (np->rxopt.bits.rxinfo) {
1192 struct in6_pktinfo src_info;
f250dcda
YH		 1193 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1194 np->sticky_pktinfo.ipi6_ifindex;
efe4208f 1195 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1da177e4
LT		 1196 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1197 }
1198 if (np->rxopt.bits.rxhlim) {
1199 int hlim = np->mcast_hops;
1200 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1201 }
4c507d28 1202 if (np->rxopt.bits.rxtclass) {
d76ed22b
LR		 1203 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1204
4c507d28
JB		 1205 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1206 }
333fad53
YH		 1207 if (np->rxopt.bits.rxoinfo) {
1208 struct in6_pktinfo src_info;
f250dcda
YH		 1209 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1210 np->sticky_pktinfo.ipi6_ifindex;
efe4208f
ED		 1211 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1212 np->sticky_pktinfo.ipi6_addr;
333fad53
YH		 1213 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1214 }
1215 if (np->rxopt.bits.rxohlim) {
1216 int hlim = np->mcast_hops;
1217 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1218 }
1397ed35 1219 if (np->rxopt.bits.rxflow) {
68536053
FF		 1220 __be32 flowinfo = np->rcv_flowinfo;
1221
1397ed35
FF		 1222 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1223 }
1da177e4
LT		 1224 }
1225 len -= msg.msg_controllen;
6dadbe4b 1226 return copy_to_sockptr(optlen, &len, sizeof(int));
1da177e4
LT		 1227 }
1228 case IPV6_MTU:
1229 {
1230 struct dst_entry *dst;
b6c6712a 1231
1ab1457c 1232 val = 0;
b6c6712a
ED		 1233 rcu_read_lock();
1234 dst = __sk_dst_get(sk);
1235 if (dst)
1da177e4 1236 val = dst_mtu(dst);
b6c6712a 1237 rcu_read_unlock();
1da177e4
LT		 1238 if (!val)
1239 return -ENOTCONN;
1240 break;
1241 }
1242
1243 case IPV6_V6ONLY:
9fe516ba 1244 val = sk->sk_ipv6only;
1da177e4
LT		 1245 break;
1246
333fad53 1247 case IPV6_RECVPKTINFO:
1da177e4
LT		 1248 val = np->rxopt.bits.rxinfo;
1249 break;
1250
333fad53
YH		 1251 case IPV6_2292PKTINFO:
1252 val = np->rxopt.bits.rxoinfo;
1253 break;
1254
1255 case IPV6_RECVHOPLIMIT:
1da177e4
LT		 1256 val = np->rxopt.bits.rxhlim;
1257 break;
1258
333fad53
YH		 1259 case IPV6_2292HOPLIMIT:
1260 val = np->rxopt.bits.rxohlim;
1261 break;
1262
1263 case IPV6_RECVRTHDR:
1da177e4
LT		 1264 val = np->rxopt.bits.srcrt;
1265 break;
1266
333fad53
YH		 1267 case IPV6_2292RTHDR:
1268 val = np->rxopt.bits.osrcrt;
1269 break;
1270
1da177e4 1271 case IPV6_HOPOPTS:
333fad53
YH		 1272 case IPV6_RTHDRDSTOPTS:
1273 case IPV6_RTHDR:
1274 case IPV6_DSTOPTS:
1275 {
45f6fad8 1276 struct ipv6_txoptions *opt;
333fad53 1277
0f95f7d4 1278 sockopt_lock_sock(sk);
1e1d04e6
HFS		 1279 opt = rcu_dereference_protected(np->opt,
1280 lockdep_sock_is_held(sk));
45f6fad8 1281 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
0f95f7d4 1282 sockopt_release_sock(sk);
05335c22
YH		 1283 /* check if ipv6_getsockopt_sticky() returns err code */
1284 if (len < 0)
1285 return len;
6dadbe4b 1286 return copy_to_sockptr(optlen, &len, sizeof(int));
333fad53
YH		 1287 }
1288
1289 case IPV6_RECVHOPOPTS:
1da177e4
LT		 1290 val = np->rxopt.bits.hopopts;
1291 break;
1292
333fad53
YH		 1293 case IPV6_2292HOPOPTS:
1294 val = np->rxopt.bits.ohopopts;
1295 break;
1296
1297 case IPV6_RECVDSTOPTS:
1da177e4
LT		 1298 val = np->rxopt.bits.dstopts;
1299 break;
1300
333fad53
YH		 1301 case IPV6_2292DSTOPTS:
1302 val = np->rxopt.bits.odstopts;
1303 break;
1304
41a1f8ea
YH		 1305 case IPV6_TCLASS:
1306 val = np->tclass;
1307 break;
1308
1309 case IPV6_RECVTCLASS:
1310 val = np->rxopt.bits.rxtclass;
1311 break;
1312
1da177e4
LT		 1313 case IPV6_FLOWINFO:
1314 val = np->rxopt.bits.rxflow;
1315 break;
1316
793b1473
BH		 1317 case IPV6_RECVPATHMTU:
1318 val = np->rxopt.bits.rxpmtu;
1319 break;
1320
1321 case IPV6_PATHMTU:
1322 {
1323 struct dst_entry *dst;
1324 struct ip6_mtuinfo mtuinfo;
1325
1326 if (len < sizeof(mtuinfo))
1327 return -EINVAL;
1328
1329 len = sizeof(mtuinfo);
1330 memset(&mtuinfo, 0, sizeof(mtuinfo));
1331
1332 rcu_read_lock();
1333 dst = __sk_dst_get(sk);
1334 if (dst)
1335 mtuinfo.ip6m_mtu = dst_mtu(dst);
1336 rcu_read_unlock();
1337 if (!mtuinfo.ip6m_mtu)
1338 return -ENOTCONN;
1339
6dadbe4b 1340 if (copy_to_sockptr(optlen, &len, sizeof(int)))
793b1473 1341 return -EFAULT;
6dadbe4b 1342 if (copy_to_sockptr(optval, &mtuinfo, len))
793b1473
BH		 1343 return -EFAULT;
1344
1345 return 0;
793b1473
BH		 1346 }
1347
6c468622
BS		 1348 case IPV6_TRANSPARENT:
1349 val = inet_sk(sk)->transparent;
1350 break;
1351
84e14fe3
MŻ		 1352 case IPV6_FREEBIND:
1353 val = inet_sk(sk)->freebind;
1354 break;
1355
6c468622
BS		 1356 case IPV6_RECVORIGDSTADDR:
1357 val = np->rxopt.bits.rxorigdstaddr;
1358 break;
1359
1da177e4 1360 case IPV6_UNICAST_HOPS:
1da177e4 1361 case IPV6_MULTICAST_HOPS:
befffe90
BH		 1362 {
1363 struct dst_entry *dst;
1364
1365 if (optname == IPV6_UNICAST_HOPS)
1366 val = np->hop_limit;
1367 else
1368 val = np->mcast_hops;
1369
b6c6712a
ED		 1370 if (val < 0) {
1371 rcu_read_lock();
1372 dst = __sk_dst_get(sk);
1373 if (dst)
6b75d090 1374 val = ip6_dst_hoplimit(dst);
b6c6712a 1375 rcu_read_unlock();
befffe90 1376 }
b6c6712a 1377
befffe90 1378 if (val < 0)
53b7997f 1379 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1da177e4 1380 break;
befffe90 1381 }
1da177e4
LT		 1382
1383 case IPV6_MULTICAST_LOOP:
1384 val = np->mc_loop;
1385 break;
1386
1387 case IPV6_MULTICAST_IF:
1388 val = np->mcast_oif;
1389 break;
1390
15033f04
AN		 1391 case IPV6_MULTICAST_ALL:
1392 val = np->mc_all;
1393 break;
1394
c4062dfc
EH		 1395 case IPV6_UNICAST_IF:
1396 val = (__force int)htonl((__u32) np->ucast_oif);
1397 break;
1398
1da177e4
LT		 1399 case IPV6_MTU_DISCOVER:
1400 val = np->pmtudisc;
1401 break;
1402
1403 case IPV6_RECVERR:
1404 val = np->recverr;
1405 break;
1406
1407 case IPV6_FLOWINFO_SEND:
1408 val = np->sndflow;
1409 break;
1410
3fdfa5ff
FF		 1411 case IPV6_FLOWLABEL_MGR:
1412 {
1413 struct in6_flowlabel_req freq;
46e5f401 1414 int flags;
3fdfa5ff
FF		 1415
1416 if (len < sizeof(freq))
1417 return -EINVAL;
1418
6dadbe4b 1419 if (copy_from_sockptr(&freq, optval, sizeof(freq)))
3fdfa5ff
FF		 1420 return -EFAULT;
1421
1422 if (freq.flr_action != IPV6_FL_A_GET)
1423 return -EINVAL;
1424
1425 len = sizeof(freq);
46e5f401
FF		 1426 flags = freq.flr_flags;
1427
3fdfa5ff
FF		 1428 memset(&freq, 0, sizeof(freq));
1429
46e5f401 1430 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
3fdfa5ff
FF		 1431 if (val < 0)
1432 return val;
1433
6dadbe4b 1434 if (copy_to_sockptr(optlen, &len, sizeof(int)))
3fdfa5ff 1435 return -EFAULT;
6dadbe4b 1436 if (copy_to_sockptr(optval, &freq, len))
3fdfa5ff
FF		 1437 return -EFAULT;
1438
1439 return 0;
1440 }
1441
7cbca67c
YH		 1442 case IPV6_ADDR_PREFERENCES:
1443 val = 0;
1444
1445 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1446 val |= IPV6_PREFER_SRC_TMP;
1447 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1448 val |= IPV6_PREFER_SRC_PUBLIC;
1449 else {
1450 /* XXX: should we return system default? */
1451 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1452 }
1453
1454 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1455 val |= IPV6_PREFER_SRC_COA;
1456 else
1457 val |= IPV6_PREFER_SRC_HOME;
1458 break;
e802af9c
SH		 1459
1460 case IPV6_MINHOPCOUNT:
1461 val = np->min_hopcount;
1462 break;
793b1473
BH		 1463
1464 case IPV6_DONTFRAG:
1465 val = np->dontfrag;
1466 break;
7cbca67c 1467
cb1ce2ef 1468 case IPV6_AUTOFLOWLABEL:
e9191ffb 1469 val = ip6_autoflowlabel(sock_net(sk), np);
cb1ce2ef
TH		 1470 break;
1471
0cc0aa61
WB		 1472 case IPV6_RECVFRAGSIZE:
1473 val = np->rxopt.bits.recvfragsize;
1474 break;
1475
9036b2fe
FR		 1476 case IPV6_ROUTER_ALERT_ISOLATE:
1477 val = np->rtalert_isolate;
1478 break;
1479
01370434
WB		 1480 case IPV6_RECVERR_RFC4884:
1481 val = np->recverr_rfc4884;
1482 break;
1483
1da177e4 1484 default:
cf6fc4a9 1485 return -ENOPROTOOPT;
1da177e4
LT		 1486 }
1487 len = min_t(unsigned int, sizeof(int), len);
6dadbe4b 1488 if (copy_to_sockptr(optlen, &len, sizeof(int)))
1da177e4 1489 return -EFAULT;
6dadbe4b 1490 if (copy_to_sockptr(optval, &val, len))
1da177e4
LT		 1491 return -EFAULT;
1492 return 0;
1493}
1494
3fdadf7d
DM		 1495int ipv6_getsockopt(struct sock *sk, int level, int optname,
1496 char __user *optval, int __user *optlen)
1497{
1498 int err;
1499
1500 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1501 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1502
67ba4152 1503 if (level != SOL_IPV6)
3fdadf7d
DM		 1504 return -ENOPROTOOPT;
1505
6dadbe4b
MKL		 1506 err = do_ipv6_getsockopt(sk, level, optname,
1507 USER_SOCKPTR(optval), USER_SOCKPTR(optlen));
3fdadf7d 1508#ifdef CONFIG_NETFILTER
cf6fc4a9
WY		 1509 /* we need to exclude all possible ENOPROTOOPTs except default case */
1510 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
3fdadf7d
DM		 1511 int len;
1512
1513 if (get_user(len, optlen))
1514 return -EFAULT;
1515
01ea306f 1516 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
3fdadf7d
DM		 1517 if (err >= 0)
1518 err = put_user(len, optlen);
1519 }
1520#endif
1521 return err;
1522}
7159039a 1523EXPORT_SYMBOL(ipv6_getsockopt);
Linux 6.x block layer and io_uring tree(s)