/net/ipv6/ipv6_sockglue.c

http://github.com/mirrors/linux · C · 1452 lines · 1201 code · 200 blank · 51 comment · 304 complexity · 0cdcc50f7bcf50db4ceb93b4955d1d38 MD5 · raw file

  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. #include <linux/module.h>
  21. #include <linux/capability.h>
  22. #include <linux/errno.h>
  23. #include <linux/types.h>
  24. #include <linux/socket.h>
  25. #include <linux/sockios.h>
  26. #include <linux/net.h>
  27. #include <linux/in6.h>
  28. #include <linux/mroute6.h>
  29. #include <linux/netdevice.h>
  30. #include <linux/if_arp.h>
  31. #include <linux/init.h>
  32. #include <linux/sysctl.h>
  33. #include <linux/netfilter.h>
  34. #include <linux/slab.h>
  35. #include <net/sock.h>
  36. #include <net/snmp.h>
  37. #include <net/ipv6.h>
  38. #include <net/ndisc.h>
  39. #include <net/protocol.h>
  40. #include <net/transp_v6.h>
  41. #include <net/ip6_route.h>
  42. #include <net/addrconf.h>
  43. #include <net/inet_common.h>
  44. #include <net/tcp.h>
  45. #include <net/udp.h>
  46. #include <net/udplite.h>
  47. #include <net/xfrm.h>
  48. #include <net/compat.h>
  49. #include <net/seg6.h>
  50. #include <linux/uaccess.h>
  51. struct ip6_ra_chain *ip6_ra_chain;
  52. DEFINE_RWLOCK(ip6_ra_lock);
  53. int ip6_ra_control(struct sock *sk, int sel)
  54. {
  55. struct ip6_ra_chain *ra, *new_ra, **rap;
  56. /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  57. if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
  58. return -ENOPROTOOPT;
  59. new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  60. if (sel >= 0 && !new_ra)
  61. return -ENOMEM;
  62. write_lock_bh(&ip6_ra_lock);
  63. for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
  64. if (ra->sk == sk) {
  65. if (sel >= 0) {
  66. write_unlock_bh(&ip6_ra_lock);
  67. kfree(new_ra);
  68. return -EADDRINUSE;
  69. }
  70. *rap = ra->next;
  71. write_unlock_bh(&ip6_ra_lock);
  72. sock_put(sk);
  73. kfree(ra);
  74. return 0;
  75. }
  76. }
  77. if (!new_ra) {
  78. write_unlock_bh(&ip6_ra_lock);
  79. return -ENOBUFS;
  80. }
  81. new_ra->sk = sk;
  82. new_ra->sel = sel;
  83. new_ra->next = ra;
  84. *rap = new_ra;
  85. sock_hold(sk);
  86. write_unlock_bh(&ip6_ra_lock);
  87. return 0;
  88. }
  89. struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
  90. struct ipv6_txoptions *opt)
  91. {
  92. if (inet_sk(sk)->is_icsk) {
  93. if (opt &&
  94. !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
  95. inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
  96. struct inet_connection_sock *icsk = inet_csk(sk);
  97. icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
  98. icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
  99. }
  100. }
  101. opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
  102. opt);
  103. sk_dst_reset(sk);
  104. return opt;
  105. }
  106. static bool setsockopt_needs_rtnl(int optname)
  107. {
  108. switch (optname) {
  109. case IPV6_ADDRFORM:
  110. case IPV6_ADD_MEMBERSHIP:
  111. case IPV6_DROP_MEMBERSHIP:
  112. case IPV6_JOIN_ANYCAST:
  113. case IPV6_LEAVE_ANYCAST:
  114. case MCAST_JOIN_GROUP:
  115. case MCAST_LEAVE_GROUP:
  116. case MCAST_JOIN_SOURCE_GROUP:
  117. case MCAST_LEAVE_SOURCE_GROUP:
  118. case MCAST_BLOCK_SOURCE:
  119. case MCAST_UNBLOCK_SOURCE:
  120. case MCAST_MSFILTER:
  121. return true;
  122. }
  123. return false;
  124. }
  125. static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
  126. char __user *optval, unsigned int optlen)
  127. {
  128. struct ipv6_pinfo *np = inet6_sk(sk);
  129. struct net *net = sock_net(sk);
  130. int val, valbool;
  131. int retv = -ENOPROTOOPT;
  132. bool needs_rtnl = setsockopt_needs_rtnl(optname);
  133. if (!optval)
  134. val = 0;
  135. else {
  136. if (optlen >= sizeof(int)) {
  137. if (get_user(val, (int __user *) optval))
  138. return -EFAULT;
  139. } else
  140. val = 0;
  141. }
  142. valbool = (val != 0);
  143. if (ip6_mroute_opt(optname))
  144. return ip6_mroute_setsockopt(sk, optname, optval, optlen);
  145. if (needs_rtnl)
  146. rtnl_lock();
  147. lock_sock(sk);
  148. switch (optname) {
  149. case IPV6_ADDRFORM:
  150. if (optlen < sizeof(int))
  151. goto e_inval;
  152. if (val == PF_INET) {
  153. struct ipv6_txoptions *opt;
  154. struct sk_buff *pktopt;
  155. if (sk->sk_type == SOCK_RAW)
  156. break;
  157. if (sk->sk_protocol == IPPROTO_UDP ||
  158. sk->sk_protocol == IPPROTO_UDPLITE) {
  159. struct udp_sock *up = udp_sk(sk);
  160. if (up->pending == AF_INET6) {
  161. retv = -EBUSY;
  162. break;
  163. }
  164. }
  165. if (sk->sk_protocol == IPPROTO_TCP &&
  166. sk->sk_prot != &tcpv6_prot) {
  167. retv = -EBUSY;
  168. break;
  169. }
  170. if (sk->sk_protocol != IPPROTO_TCP)
  171. break;
  172. if (sk->sk_state != TCP_ESTABLISHED) {
  173. retv = -ENOTCONN;
  174. break;
  175. }
  176. if (ipv6_only_sock(sk) ||
  177. !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
  178. retv = -EADDRNOTAVAIL;
  179. break;
  180. }
  181. fl6_free_socklist(sk);
  182. __ipv6_sock_mc_close(sk);
  183. /*
  184. * Sock is moving from IPv6 to IPv4 (sk_prot), so
  185. * remove it from the refcnt debug socks count in the
  186. * original family...
  187. */
  188. sk_refcnt_debug_dec(sk);
  189. if (sk->sk_protocol == IPPROTO_TCP) {
  190. struct inet_connection_sock *icsk = inet_csk(sk);
  191. local_bh_disable();
  192. sock_prot_inuse_add(net, sk->sk_prot, -1);
  193. sock_prot_inuse_add(net, &tcp_prot, 1);
  194. local_bh_enable();
  195. sk->sk_prot = &tcp_prot;
  196. icsk->icsk_af_ops = &ipv4_specific;
  197. sk->sk_socket->ops = &inet_stream_ops;
  198. sk->sk_family = PF_INET;
  199. tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
  200. } else {
  201. struct proto *prot = &udp_prot;
  202. if (sk->sk_protocol == IPPROTO_UDPLITE)
  203. prot = &udplite_prot;
  204. local_bh_disable();
  205. sock_prot_inuse_add(net, sk->sk_prot, -1);
  206. sock_prot_inuse_add(net, prot, 1);
  207. local_bh_enable();
  208. sk->sk_prot = prot;
  209. sk->sk_socket->ops = &inet_dgram_ops;
  210. sk->sk_family = PF_INET;
  211. }
  212. opt = xchg((__force struct ipv6_txoptions **)&np->opt,
  213. NULL);
  214. if (opt) {
  215. atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
  216. txopt_put(opt);
  217. }
  218. pktopt = xchg(&np->pktoptions, NULL);
  219. kfree_skb(pktopt);
  220. /*
  221. * ... and add it to the refcnt debug socks count
  222. * in the new family. -acme
  223. */
  224. sk_refcnt_debug_inc(sk);
  225. module_put(THIS_MODULE);
  226. retv = 0;
  227. break;
  228. }
  229. goto e_inval;
  230. case IPV6_V6ONLY:
  231. if (optlen < sizeof(int) ||
  232. inet_sk(sk)->inet_num)
  233. goto e_inval;
  234. sk->sk_ipv6only = valbool;
  235. retv = 0;
  236. break;
  237. case IPV6_RECVPKTINFO:
  238. if (optlen < sizeof(int))
  239. goto e_inval;
  240. np->rxopt.bits.rxinfo = valbool;
  241. retv = 0;
  242. break;
  243. case IPV6_2292PKTINFO:
  244. if (optlen < sizeof(int))
  245. goto e_inval;
  246. np->rxopt.bits.rxoinfo = valbool;
  247. retv = 0;
  248. break;
  249. case IPV6_RECVHOPLIMIT:
  250. if (optlen < sizeof(int))
  251. goto e_inval;
  252. np->rxopt.bits.rxhlim = valbool;
  253. retv = 0;
  254. break;
  255. case IPV6_2292HOPLIMIT:
  256. if (optlen < sizeof(int))
  257. goto e_inval;
  258. np->rxopt.bits.rxohlim = valbool;
  259. retv = 0;
  260. break;
  261. case IPV6_RECVRTHDR:
  262. if (optlen < sizeof(int))
  263. goto e_inval;
  264. np->rxopt.bits.srcrt = valbool;
  265. retv = 0;
  266. break;
  267. case IPV6_2292RTHDR:
  268. if (optlen < sizeof(int))
  269. goto e_inval;
  270. np->rxopt.bits.osrcrt = valbool;
  271. retv = 0;
  272. break;
  273. case IPV6_RECVHOPOPTS:
  274. if (optlen < sizeof(int))
  275. goto e_inval;
  276. np->rxopt.bits.hopopts = valbool;
  277. retv = 0;
  278. break;
  279. case IPV6_2292HOPOPTS:
  280. if (optlen < sizeof(int))
  281. goto e_inval;
  282. np->rxopt.bits.ohopopts = valbool;
  283. retv = 0;
  284. break;
  285. case IPV6_RECVDSTOPTS:
  286. if (optlen < sizeof(int))
  287. goto e_inval;
  288. np->rxopt.bits.dstopts = valbool;
  289. retv = 0;
  290. break;
  291. case IPV6_2292DSTOPTS:
  292. if (optlen < sizeof(int))
  293. goto e_inval;
  294. np->rxopt.bits.odstopts = valbool;
  295. retv = 0;
  296. break;
  297. case IPV6_TCLASS:
  298. if (optlen < sizeof(int))
  299. goto e_inval;
  300. if (val < -1 || val > 0xff)
  301. goto e_inval;
  302. /* RFC 3542, 6.5: default traffic class of 0x0 */
  303. if (val == -1)
  304. val = 0;
  305. np->tclass = val;
  306. retv = 0;
  307. break;
  308. case IPV6_RECVTCLASS:
  309. if (optlen < sizeof(int))
  310. goto e_inval;
  311. np->rxopt.bits.rxtclass = valbool;
  312. retv = 0;
  313. break;
  314. case IPV6_FLOWINFO:
  315. if (optlen < sizeof(int))
  316. goto e_inval;
  317. np->rxopt.bits.rxflow = valbool;
  318. retv = 0;
  319. break;
  320. case IPV6_RECVPATHMTU:
  321. if (optlen < sizeof(int))
  322. goto e_inval;
  323. np->rxopt.bits.rxpmtu = valbool;
  324. retv = 0;
  325. break;
  326. case IPV6_TRANSPARENT:
  327. if (valbool && !ns_capable(net->user_ns, CAP_NET_RAW) &&
  328. !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
  329. retv = -EPERM;
  330. break;
  331. }
  332. if (optlen < sizeof(int))
  333. goto e_inval;
  334. /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
  335. inet_sk(sk)->transparent = valbool;
  336. retv = 0;
  337. break;
  338. case IPV6_FREEBIND:
  339. if (optlen < sizeof(int))
  340. goto e_inval;
  341. /* we also don't have a separate freebind bit for IPV6 */
  342. inet_sk(sk)->freebind = valbool;
  343. retv = 0;
  344. break;
  345. case IPV6_RECVORIGDSTADDR:
  346. if (optlen < sizeof(int))
  347. goto e_inval;
  348. np->rxopt.bits.rxorigdstaddr = valbool;
  349. retv = 0;
  350. break;
  351. case IPV6_HOPOPTS:
  352. case IPV6_RTHDRDSTOPTS:
  353. case IPV6_RTHDR:
  354. case IPV6_DSTOPTS:
  355. {
  356. struct ipv6_txoptions *opt;
  357. struct ipv6_opt_hdr *new = NULL;
  358. /* hop-by-hop / destination options are privileged option */
  359. retv = -EPERM;
  360. if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
  361. break;
  362. /* remove any sticky options header with a zero option
  363. * length, per RFC3542.
  364. */
  365. if (optlen == 0)
  366. optval = NULL;
  367. else if (!optval)
  368. goto e_inval;
  369. else if (optlen < sizeof(struct ipv6_opt_hdr) ||
  370. optlen & 0x7 || optlen > 8 * 255)
  371. goto e_inval;
  372. else {
  373. new = memdup_user(optval, optlen);
  374. if (IS_ERR(new)) {
  375. retv = PTR_ERR(new);
  376. break;
  377. }
  378. if (unlikely(ipv6_optlen(new) > optlen)) {
  379. kfree(new);
  380. goto e_inval;
  381. }
  382. }
  383. opt = rcu_dereference_protected(np->opt,
  384. lockdep_sock_is_held(sk));
  385. opt = ipv6_renew_options(sk, opt, optname, new);
  386. kfree(new);
  387. if (IS_ERR(opt)) {
  388. retv = PTR_ERR(opt);
  389. break;
  390. }
  391. /* routing header option needs extra check */
  392. retv = -EINVAL;
  393. if (optname == IPV6_RTHDR && opt && opt->srcrt) {
  394. struct ipv6_rt_hdr *rthdr = opt->srcrt;
  395. switch (rthdr->type) {
  396. #if IS_ENABLED(CONFIG_IPV6_MIP6)
  397. case IPV6_SRCRT_TYPE_2:
  398. if (rthdr->hdrlen != 2 ||
  399. rthdr->segments_left != 1)
  400. goto sticky_done;
  401. break;
  402. #endif
  403. case IPV6_SRCRT_TYPE_4:
  404. {
  405. struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
  406. opt->srcrt;
  407. if (!seg6_validate_srh(srh, optlen))
  408. goto sticky_done;
  409. break;
  410. }
  411. default:
  412. goto sticky_done;
  413. }
  414. }
  415. retv = 0;
  416. opt = ipv6_update_options(sk, opt);
  417. sticky_done:
  418. if (opt) {
  419. atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
  420. txopt_put(opt);
  421. }
  422. break;
  423. }
  424. case IPV6_PKTINFO:
  425. {
  426. struct in6_pktinfo pkt;
  427. if (optlen == 0)
  428. goto e_inval;
  429. else if (optlen < sizeof(struct in6_pktinfo) || !optval)
  430. goto e_inval;
  431. if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
  432. retv = -EFAULT;
  433. break;
  434. }
  435. if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
  436. goto e_inval;
  437. np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
  438. np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
  439. retv = 0;
  440. break;
  441. }
  442. case IPV6_2292PKTOPTIONS:
  443. {
  444. struct ipv6_txoptions *opt = NULL;
  445. struct msghdr msg;
  446. struct flowi6 fl6;
  447. struct ipcm6_cookie ipc6;
  448. memset(&fl6, 0, sizeof(fl6));
  449. fl6.flowi6_oif = sk->sk_bound_dev_if;
  450. fl6.flowi6_mark = sk->sk_mark;
  451. if (optlen == 0)
  452. goto update;
  453. /* 1K is probably excessive
  454. * 1K is surely not enough, 2K per standard header is 16K.
  455. */
  456. retv = -EINVAL;
  457. if (optlen > 64*1024)
  458. break;
  459. opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
  460. retv = -ENOBUFS;
  461. if (!opt)
  462. break;
  463. memset(opt, 0, sizeof(*opt));
  464. refcount_set(&opt->refcnt, 1);
  465. opt->tot_len = sizeof(*opt) + optlen;
  466. retv = -EFAULT;
  467. if (copy_from_user(opt+1, optval, optlen))
  468. goto done;
  469. msg.msg_controllen = optlen;
  470. msg.msg_control = (void *)(opt+1);
  471. ipc6.opt = opt;
  472. retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
  473. if (retv)
  474. goto done;
  475. update:
  476. retv = 0;
  477. opt = ipv6_update_options(sk, opt);
  478. done:
  479. if (opt) {
  480. atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
  481. txopt_put(opt);
  482. }
  483. break;
  484. }
  485. case IPV6_UNICAST_HOPS:
  486. if (optlen < sizeof(int))
  487. goto e_inval;
  488. if (val > 255 || val < -1)
  489. goto e_inval;
  490. np->hop_limit = val;
  491. retv = 0;
  492. break;
  493. case IPV6_MULTICAST_HOPS:
  494. if (sk->sk_type == SOCK_STREAM)
  495. break;
  496. if (optlen < sizeof(int))
  497. goto e_inval;
  498. if (val > 255 || val < -1)
  499. goto e_inval;
  500. np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
  501. retv = 0;
  502. break;
  503. case IPV6_MULTICAST_LOOP:
  504. if (optlen < sizeof(int))
  505. goto e_inval;
  506. if (val != valbool)
  507. goto e_inval;
  508. np->mc_loop = valbool;
  509. retv = 0;
  510. break;
  511. case IPV6_UNICAST_IF:
  512. {
  513. struct net_device *dev = NULL;
  514. int ifindex;
  515. if (optlen != sizeof(int))
  516. goto e_inval;
  517. ifindex = (__force int)ntohl((__force __be32)val);
  518. if (ifindex == 0) {
  519. np->ucast_oif = 0;
  520. retv = 0;
  521. break;
  522. }
  523. dev = dev_get_by_index(net, ifindex);
  524. retv = -EADDRNOTAVAIL;
  525. if (!dev)
  526. break;
  527. dev_put(dev);
  528. retv = -EINVAL;
  529. if (sk->sk_bound_dev_if)
  530. break;
  531. np->ucast_oif = ifindex;
  532. retv = 0;
  533. break;
  534. }
  535. case IPV6_MULTICAST_IF:
  536. if (sk->sk_type == SOCK_STREAM)
  537. break;
  538. if (optlen < sizeof(int))
  539. goto e_inval;
  540. if (val) {
  541. struct net_device *dev;
  542. int midx;
  543. rcu_read_lock();
  544. dev = dev_get_by_index_rcu(net, val);
  545. if (!dev) {
  546. rcu_read_unlock();
  547. retv = -ENODEV;
  548. break;
  549. }
  550. midx = l3mdev_master_ifindex_rcu(dev);
  551. rcu_read_unlock();
  552. if (sk->sk_bound_dev_if &&
  553. sk->sk_bound_dev_if != val &&
  554. (!midx || midx != sk->sk_bound_dev_if))
  555. goto e_inval;
  556. }
  557. np->mcast_oif = val;
  558. retv = 0;
  559. break;
  560. case IPV6_ADD_MEMBERSHIP:
  561. case IPV6_DROP_MEMBERSHIP:
  562. {
  563. struct ipv6_mreq mreq;
  564. if (optlen < sizeof(struct ipv6_mreq))
  565. goto e_inval;
  566. retv = -EPROTO;
  567. if (inet_sk(sk)->is_icsk)
  568. break;
  569. retv = -EFAULT;
  570. if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
  571. break;
  572. if (optname == IPV6_ADD_MEMBERSHIP)
  573. retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
  574. else
  575. retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
  576. break;
  577. }
  578. case IPV6_JOIN_ANYCAST:
  579. case IPV6_LEAVE_ANYCAST:
  580. {
  581. struct ipv6_mreq mreq;
  582. if (optlen < sizeof(struct ipv6_mreq))
  583. goto e_inval;
  584. retv = -EFAULT;
  585. if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
  586. break;
  587. if (optname == IPV6_JOIN_ANYCAST)
  588. retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
  589. else
  590. retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
  591. break;
  592. }
  593. case IPV6_MULTICAST_ALL:
  594. if (optlen < sizeof(int))
  595. goto e_inval;
  596. np->mc_all = valbool;
  597. retv = 0;
  598. break;
  599. case MCAST_JOIN_GROUP:
  600. case MCAST_LEAVE_GROUP:
  601. {
  602. struct group_req greq;
  603. struct sockaddr_in6 *psin6;
  604. if (optlen < sizeof(struct group_req))
  605. goto e_inval;
  606. retv = -EFAULT;
  607. if (copy_from_user(&greq, optval, sizeof(struct group_req)))
  608. break;
  609. if (greq.gr_group.ss_family != AF_INET6) {
  610. retv = -EADDRNOTAVAIL;
  611. break;
  612. }
  613. psin6 = (struct sockaddr_in6 *)&greq.gr_group;
  614. if (optname == MCAST_JOIN_GROUP)
  615. retv = ipv6_sock_mc_join(sk, greq.gr_interface,
  616. &psin6->sin6_addr);
  617. else
  618. retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
  619. &psin6->sin6_addr);
  620. break;
  621. }
  622. case MCAST_JOIN_SOURCE_GROUP:
  623. case MCAST_LEAVE_SOURCE_GROUP:
  624. case MCAST_BLOCK_SOURCE:
  625. case MCAST_UNBLOCK_SOURCE:
  626. {
  627. struct group_source_req greqs;
  628. int omode, add;
  629. if (optlen < sizeof(struct group_source_req))
  630. goto e_inval;
  631. if (copy_from_user(&greqs, optval, sizeof(greqs))) {
  632. retv = -EFAULT;
  633. break;
  634. }
  635. if (greqs.gsr_group.ss_family != AF_INET6 ||
  636. greqs.gsr_source.ss_family != AF_INET6) {
  637. retv = -EADDRNOTAVAIL;
  638. break;
  639. }
  640. if (optname == MCAST_BLOCK_SOURCE) {
  641. omode = MCAST_EXCLUDE;
  642. add = 1;
  643. } else if (optname == MCAST_UNBLOCK_SOURCE) {
  644. omode = MCAST_EXCLUDE;
  645. add = 0;
  646. } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
  647. struct sockaddr_in6 *psin6;
  648. psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
  649. retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
  650. &psin6->sin6_addr,
  651. MCAST_INCLUDE);
  652. /* prior join w/ different source is ok */
  653. if (retv && retv != -EADDRINUSE)
  654. break;
  655. omode = MCAST_INCLUDE;
  656. add = 1;
  657. } else /* MCAST_LEAVE_SOURCE_GROUP */ {
  658. omode = MCAST_INCLUDE;
  659. add = 0;
  660. }
  661. retv = ip6_mc_source(add, omode, sk, &greqs);
  662. break;
  663. }
  664. case MCAST_MSFILTER:
  665. {
  666. struct group_filter *gsf;
  667. if (optlen < GROUP_FILTER_SIZE(0))
  668. goto e_inval;
  669. if (optlen > sysctl_optmem_max) {
  670. retv = -ENOBUFS;
  671. break;
  672. }
  673. gsf = memdup_user(optval, optlen);
  674. if (IS_ERR(gsf)) {
  675. retv = PTR_ERR(gsf);
  676. break;
  677. }
  678. /* numsrc >= (4G-140)/128 overflow in 32 bits */
  679. if (gsf->gf_numsrc >= 0x1ffffffU ||
  680. gsf->gf_numsrc > sysctl_mld_max_msf) {
  681. kfree(gsf);
  682. retv = -ENOBUFS;
  683. break;
  684. }
  685. if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
  686. kfree(gsf);
  687. retv = -EINVAL;
  688. break;
  689. }
  690. retv = ip6_mc_msfilter(sk, gsf);
  691. kfree(gsf);
  692. break;
  693. }
  694. case IPV6_ROUTER_ALERT:
  695. if (optlen < sizeof(int))
  696. goto e_inval;
  697. retv = ip6_ra_control(sk, val);
  698. break;
  699. case IPV6_ROUTER_ALERT_ISOLATE:
  700. if (optlen < sizeof(int))
  701. goto e_inval;
  702. np->rtalert_isolate = valbool;
  703. retv = 0;
  704. break;
  705. case IPV6_MTU_DISCOVER:
  706. if (optlen < sizeof(int))
  707. goto e_inval;
  708. if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
  709. goto e_inval;
  710. np->pmtudisc = val;
  711. retv = 0;
  712. break;
  713. case IPV6_MTU:
  714. if (optlen < sizeof(int))
  715. goto e_inval;
  716. if (val && val < IPV6_MIN_MTU)
  717. goto e_inval;
  718. np->frag_size = val;
  719. retv = 0;
  720. break;
  721. case IPV6_RECVERR:
  722. if (optlen < sizeof(int))
  723. goto e_inval;
  724. np->recverr = valbool;
  725. if (!val)
  726. skb_queue_purge(&sk->sk_error_queue);
  727. retv = 0;
  728. break;
  729. case IPV6_FLOWINFO_SEND:
  730. if (optlen < sizeof(int))
  731. goto e_inval;
  732. np->sndflow = valbool;
  733. retv = 0;
  734. break;
  735. case IPV6_FLOWLABEL_MGR:
  736. retv = ipv6_flowlabel_opt(sk, optval, optlen);
  737. break;
  738. case IPV6_IPSEC_POLICY:
  739. case IPV6_XFRM_POLICY:
  740. retv = -EPERM;
  741. if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
  742. break;
  743. retv = xfrm_user_policy(sk, optname, optval, optlen);
  744. break;
  745. case IPV6_ADDR_PREFERENCES:
  746. {
  747. unsigned int pref = 0;
  748. unsigned int prefmask = ~0;
  749. if (optlen < sizeof(int))
  750. goto e_inval;
  751. retv = -EINVAL;
  752. /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
  753. switch (val & (IPV6_PREFER_SRC_PUBLIC|
  754. IPV6_PREFER_SRC_TMP|
  755. IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
  756. case IPV6_PREFER_SRC_PUBLIC:
  757. pref |= IPV6_PREFER_SRC_PUBLIC;
  758. break;
  759. case IPV6_PREFER_SRC_TMP:
  760. pref |= IPV6_PREFER_SRC_TMP;
  761. break;
  762. case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
  763. break;
  764. case 0:
  765. goto pref_skip_pubtmp;
  766. default:
  767. goto e_inval;
  768. }
  769. prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
  770. IPV6_PREFER_SRC_TMP);
  771. pref_skip_pubtmp:
  772. /* check HOME/COA conflicts */
  773. switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
  774. case IPV6_PREFER_SRC_HOME:
  775. break;
  776. case IPV6_PREFER_SRC_COA:
  777. pref |= IPV6_PREFER_SRC_COA;
  778. case 0:
  779. goto pref_skip_coa;
  780. default:
  781. goto e_inval;
  782. }
  783. prefmask &= ~IPV6_PREFER_SRC_COA;
  784. pref_skip_coa:
  785. /* check CGA/NONCGA conflicts */
  786. switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
  787. case IPV6_PREFER_SRC_CGA:
  788. case IPV6_PREFER_SRC_NONCGA:
  789. case 0:
  790. break;
  791. default:
  792. goto e_inval;
  793. }
  794. np->srcprefs = (np->srcprefs & prefmask) | pref;
  795. retv = 0;
  796. break;
  797. }
  798. case IPV6_MINHOPCOUNT:
  799. if (optlen < sizeof(int))
  800. goto e_inval;
  801. if (val < 0 || val > 255)
  802. goto e_inval;
  803. np->min_hopcount = val;
  804. retv = 0;
  805. break;
  806. case IPV6_DONTFRAG:
  807. np->dontfrag = valbool;
  808. retv = 0;
  809. break;
  810. case IPV6_AUTOFLOWLABEL:
  811. np->autoflowlabel = valbool;
  812. np->autoflowlabel_set = 1;
  813. retv = 0;
  814. break;
  815. case IPV6_RECVFRAGSIZE:
  816. np->rxopt.bits.recvfragsize = valbool;
  817. retv = 0;
  818. break;
  819. }
  820. release_sock(sk);
  821. if (needs_rtnl)
  822. rtnl_unlock();
  823. return retv;
  824. e_inval:
  825. release_sock(sk);
  826. if (needs_rtnl)
  827. rtnl_unlock();
  828. return -EINVAL;
  829. }
  830. int ipv6_setsockopt(struct sock *sk, int level, int optname,
  831. char __user *optval, unsigned int optlen)
  832. {
  833. int err;
  834. if (level == SOL_IP && sk->sk_type != SOCK_RAW)
  835. return udp_prot.setsockopt(sk, level, optname, optval, optlen);
  836. if (level != SOL_IPV6)
  837. return -ENOPROTOOPT;
  838. err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
  839. #ifdef CONFIG_NETFILTER
  840. /* we need to exclude all possible ENOPROTOOPTs except default case */
  841. if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
  842. optname != IPV6_XFRM_POLICY)
  843. err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
  844. #endif
  845. return err;
  846. }
  847. EXPORT_SYMBOL(ipv6_setsockopt);
  848. #ifdef CONFIG_COMPAT
  849. int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
  850. char __user *optval, unsigned int optlen)
  851. {
  852. int err;
  853. if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
  854. if (udp_prot.compat_setsockopt != NULL)
  855. return udp_prot.compat_setsockopt(sk, level, optname,
  856. optval, optlen);
  857. return udp_prot.setsockopt(sk, level, optname, optval, optlen);
  858. }
  859. if (level != SOL_IPV6)
  860. return -ENOPROTOOPT;
  861. if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
  862. return compat_mc_setsockopt(sk, level, optname, optval, optlen,
  863. ipv6_setsockopt);
  864. err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
  865. #ifdef CONFIG_NETFILTER
  866. /* we need to exclude all possible ENOPROTOOPTs except default case */
  867. if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
  868. optname != IPV6_XFRM_POLICY)
  869. err = compat_nf_setsockopt(sk, PF_INET6, optname, optval,
  870. optlen);
  871. #endif
  872. return err;
  873. }
  874. EXPORT_SYMBOL(compat_ipv6_setsockopt);
  875. #endif
  876. static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
  877. int optname, char __user *optval, int len)
  878. {
  879. struct ipv6_opt_hdr *hdr;
  880. if (!opt)
  881. return 0;
  882. switch (optname) {
  883. case IPV6_HOPOPTS:
  884. hdr = opt->hopopt;
  885. break;
  886. case IPV6_RTHDRDSTOPTS:
  887. hdr = opt->dst0opt;
  888. break;
  889. case IPV6_RTHDR:
  890. hdr = (struct ipv6_opt_hdr *)opt->srcrt;
  891. break;
  892. case IPV6_DSTOPTS:
  893. hdr = opt->dst1opt;
  894. break;
  895. default:
  896. return -EINVAL; /* should not happen */
  897. }
  898. if (!hdr)
  899. return 0;
  900. len = min_t(unsigned int, len, ipv6_optlen(hdr));
  901. if (copy_to_user(optval, hdr, len))
  902. return -EFAULT;
  903. return len;
  904. }
  905. static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
  906. char __user *optval, int __user *optlen, unsigned int flags)
  907. {
  908. struct ipv6_pinfo *np = inet6_sk(sk);
  909. int len;
  910. int val;
  911. if (ip6_mroute_opt(optname))
  912. return ip6_mroute_getsockopt(sk, optname, optval, optlen);
  913. if (get_user(len, optlen))
  914. return -EFAULT;
  915. switch (optname) {
  916. case IPV6_ADDRFORM:
  917. if (sk->sk_protocol != IPPROTO_UDP &&
  918. sk->sk_protocol != IPPROTO_UDPLITE &&
  919. sk->sk_protocol != IPPROTO_TCP)
  920. return -ENOPROTOOPT;
  921. if (sk->sk_state != TCP_ESTABLISHED)
  922. return -ENOTCONN;
  923. val = sk->sk_family;
  924. break;
  925. case MCAST_MSFILTER:
  926. {
  927. struct group_filter gsf;
  928. int err;
  929. if (len < GROUP_FILTER_SIZE(0))
  930. return -EINVAL;
  931. if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
  932. return -EFAULT;
  933. if (gsf.gf_group.ss_family != AF_INET6)
  934. return -EADDRNOTAVAIL;
  935. lock_sock(sk);
  936. err = ip6_mc_msfget(sk, &gsf,
  937. (struct group_filter __user *)optval, optlen);
  938. release_sock(sk);
  939. return err;
  940. }
  941. case IPV6_2292PKTOPTIONS:
  942. {
  943. struct msghdr msg;
  944. struct sk_buff *skb;
  945. if (sk->sk_type != SOCK_STREAM)
  946. return -ENOPROTOOPT;
  947. msg.msg_control = optval;
  948. msg.msg_controllen = len;
  949. msg.msg_flags = flags;
  950. lock_sock(sk);
  951. skb = np->pktoptions;
  952. if (skb)
  953. ip6_datagram_recv_ctl(sk, &msg, skb);
  954. release_sock(sk);
  955. if (!skb) {
  956. if (np->rxopt.bits.rxinfo) {
  957. struct in6_pktinfo src_info;
  958. src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
  959. np->sticky_pktinfo.ipi6_ifindex;
  960. src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
  961. put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
  962. }
  963. if (np->rxopt.bits.rxhlim) {
  964. int hlim = np->mcast_hops;
  965. put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
  966. }
  967. if (np->rxopt.bits.rxtclass) {
  968. int tclass = (int)ip6_tclass(np->rcv_flowinfo);
  969. put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
  970. }
  971. if (np->rxopt.bits.rxoinfo) {
  972. struct in6_pktinfo src_info;
  973. src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
  974. np->sticky_pktinfo.ipi6_ifindex;
  975. src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
  976. np->sticky_pktinfo.ipi6_addr;
  977. put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
  978. }
  979. if (np->rxopt.bits.rxohlim) {
  980. int hlim = np->mcast_hops;
  981. put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
  982. }
  983. if (np->rxopt.bits.rxflow) {
  984. __be32 flowinfo = np->rcv_flowinfo;
  985. put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
  986. }
  987. }
  988. len -= msg.msg_controllen;
  989. return put_user(len, optlen);
  990. }
  991. case IPV6_MTU:
  992. {
  993. struct dst_entry *dst;
  994. val = 0;
  995. rcu_read_lock();
  996. dst = __sk_dst_get(sk);
  997. if (dst)
  998. val = dst_mtu(dst);
  999. rcu_read_unlock();
  1000. if (!val)
  1001. return -ENOTCONN;
  1002. break;
  1003. }
  1004. case IPV6_V6ONLY:
  1005. val = sk->sk_ipv6only;
  1006. break;
  1007. case IPV6_RECVPKTINFO:
  1008. val = np->rxopt.bits.rxinfo;
  1009. break;
  1010. case IPV6_2292PKTINFO:
  1011. val = np->rxopt.bits.rxoinfo;
  1012. break;
  1013. case IPV6_RECVHOPLIMIT:
  1014. val = np->rxopt.bits.rxhlim;
  1015. break;
  1016. case IPV6_2292HOPLIMIT:
  1017. val = np->rxopt.bits.rxohlim;
  1018. break;
  1019. case IPV6_RECVRTHDR:
  1020. val = np->rxopt.bits.srcrt;
  1021. break;
  1022. case IPV6_2292RTHDR:
  1023. val = np->rxopt.bits.osrcrt;
  1024. break;
  1025. case IPV6_HOPOPTS:
  1026. case IPV6_RTHDRDSTOPTS:
  1027. case IPV6_RTHDR:
  1028. case IPV6_DSTOPTS:
  1029. {
  1030. struct ipv6_txoptions *opt;
  1031. lock_sock(sk);
  1032. opt = rcu_dereference_protected(np->opt,
  1033. lockdep_sock_is_held(sk));
  1034. len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
  1035. release_sock(sk);
  1036. /* check if ipv6_getsockopt_sticky() returns err code */
  1037. if (len < 0)
  1038. return len;
  1039. return put_user(len, optlen);
  1040. }
  1041. case IPV6_RECVHOPOPTS:
  1042. val = np->rxopt.bits.hopopts;
  1043. break;
  1044. case IPV6_2292HOPOPTS:
  1045. val = np->rxopt.bits.ohopopts;
  1046. break;
  1047. case IPV6_RECVDSTOPTS:
  1048. val = np->rxopt.bits.dstopts;
  1049. break;
  1050. case IPV6_2292DSTOPTS:
  1051. val = np->rxopt.bits.odstopts;
  1052. break;
  1053. case IPV6_TCLASS:
  1054. val = np->tclass;
  1055. break;
  1056. case IPV6_RECVTCLASS:
  1057. val = np->rxopt.bits.rxtclass;
  1058. break;
  1059. case IPV6_FLOWINFO:
  1060. val = np->rxopt.bits.rxflow;
  1061. break;
  1062. case IPV6_RECVPATHMTU:
  1063. val = np->rxopt.bits.rxpmtu;
  1064. break;
  1065. case IPV6_PATHMTU:
  1066. {
  1067. struct dst_entry *dst;
  1068. struct ip6_mtuinfo mtuinfo;
  1069. if (len < sizeof(mtuinfo))
  1070. return -EINVAL;
  1071. len = sizeof(mtuinfo);
  1072. memset(&mtuinfo, 0, sizeof(mtuinfo));
  1073. rcu_read_lock();
  1074. dst = __sk_dst_get(sk);
  1075. if (dst)
  1076. mtuinfo.ip6m_mtu = dst_mtu(dst);
  1077. rcu_read_unlock();
  1078. if (!mtuinfo.ip6m_mtu)
  1079. return -ENOTCONN;
  1080. if (put_user(len, optlen))
  1081. return -EFAULT;
  1082. if (copy_to_user(optval, &mtuinfo, len))
  1083. return -EFAULT;
  1084. return 0;
  1085. }
  1086. case IPV6_TRANSPARENT:
  1087. val = inet_sk(sk)->transparent;
  1088. break;
  1089. case IPV6_FREEBIND:
  1090. val = inet_sk(sk)->freebind;
  1091. break;
  1092. case IPV6_RECVORIGDSTADDR:
  1093. val = np->rxopt.bits.rxorigdstaddr;
  1094. break;
  1095. case IPV6_UNICAST_HOPS:
  1096. case IPV6_MULTICAST_HOPS:
  1097. {
  1098. struct dst_entry *dst;
  1099. if (optname == IPV6_UNICAST_HOPS)
  1100. val = np->hop_limit;
  1101. else
  1102. val = np->mcast_hops;
  1103. if (val < 0) {
  1104. rcu_read_lock();
  1105. dst = __sk_dst_get(sk);
  1106. if (dst)
  1107. val = ip6_dst_hoplimit(dst);
  1108. rcu_read_unlock();
  1109. }
  1110. if (val < 0)
  1111. val = sock_net(sk)->ipv6.devconf_all->hop_limit;
  1112. break;
  1113. }
  1114. case IPV6_MULTICAST_LOOP:
  1115. val = np->mc_loop;
  1116. break;
  1117. case IPV6_MULTICAST_IF:
  1118. val = np->mcast_oif;
  1119. break;
  1120. case IPV6_MULTICAST_ALL:
  1121. val = np->mc_all;
  1122. break;
  1123. case IPV6_UNICAST_IF:
  1124. val = (__force int)htonl((__u32) np->ucast_oif);
  1125. break;
  1126. case IPV6_MTU_DISCOVER:
  1127. val = np->pmtudisc;
  1128. break;
  1129. case IPV6_RECVERR:
  1130. val = np->recverr;
  1131. break;
  1132. case IPV6_FLOWINFO_SEND:
  1133. val = np->sndflow;
  1134. break;
  1135. case IPV6_FLOWLABEL_MGR:
  1136. {
  1137. struct in6_flowlabel_req freq;
  1138. int flags;
  1139. if (len < sizeof(freq))
  1140. return -EINVAL;
  1141. if (copy_from_user(&freq, optval, sizeof(freq)))
  1142. return -EFAULT;
  1143. if (freq.flr_action != IPV6_FL_A_GET)
  1144. return -EINVAL;
  1145. len = sizeof(freq);
  1146. flags = freq.flr_flags;
  1147. memset(&freq, 0, sizeof(freq));
  1148. val = ipv6_flowlabel_opt_get(sk, &freq, flags);
  1149. if (val < 0)
  1150. return val;
  1151. if (put_user(len, optlen))
  1152. return -EFAULT;
  1153. if (copy_to_user(optval, &freq, len))
  1154. return -EFAULT;
  1155. return 0;
  1156. }
  1157. case IPV6_ADDR_PREFERENCES:
  1158. val = 0;
  1159. if (np->srcprefs & IPV6_PREFER_SRC_TMP)
  1160. val |= IPV6_PREFER_SRC_TMP;
  1161. else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
  1162. val |= IPV6_PREFER_SRC_PUBLIC;
  1163. else {
  1164. /* XXX: should we return system default? */
  1165. val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
  1166. }
  1167. if (np->srcprefs & IPV6_PREFER_SRC_COA)
  1168. val |= IPV6_PREFER_SRC_COA;
  1169. else
  1170. val |= IPV6_PREFER_SRC_HOME;
  1171. break;
  1172. case IPV6_MINHOPCOUNT:
  1173. val = np->min_hopcount;
  1174. break;
  1175. case IPV6_DONTFRAG:
  1176. val = np->dontfrag;
  1177. break;
  1178. case IPV6_AUTOFLOWLABEL:
  1179. val = ip6_autoflowlabel(sock_net(sk), np);
  1180. break;
  1181. case IPV6_RECVFRAGSIZE:
  1182. val = np->rxopt.bits.recvfragsize;
  1183. break;
  1184. case IPV6_ROUTER_ALERT_ISOLATE:
  1185. val = np->rtalert_isolate;
  1186. break;
  1187. default:
  1188. return -ENOPROTOOPT;
  1189. }
  1190. len = min_t(unsigned int, sizeof(int), len);
  1191. if (put_user(len, optlen))
  1192. return -EFAULT;
  1193. if (copy_to_user(optval, &val, len))
  1194. return -EFAULT;
  1195. return 0;
  1196. }
  1197. int ipv6_getsockopt(struct sock *sk, int level, int optname,
  1198. char __user *optval, int __user *optlen)
  1199. {
  1200. int err;
  1201. if (level == SOL_IP && sk->sk_type != SOCK_RAW)
  1202. return udp_prot.getsockopt(sk, level, optname, optval, optlen);
  1203. if (level != SOL_IPV6)
  1204. return -ENOPROTOOPT;
  1205. err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
  1206. #ifdef CONFIG_NETFILTER
  1207. /* we need to exclude all possible ENOPROTOOPTs except default case */
  1208. if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
  1209. int len;
  1210. if (get_user(len, optlen))
  1211. return -EFAULT;
  1212. err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
  1213. if (err >= 0)
  1214. err = put_user(len, optlen);
  1215. }
  1216. #endif
  1217. return err;
  1218. }
  1219. EXPORT_SYMBOL(ipv6_getsockopt);
  1220. #ifdef CONFIG_COMPAT
  1221. int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
  1222. char __user *optval, int __user *optlen)
  1223. {
  1224. int err;
  1225. if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
  1226. if (udp_prot.compat_getsockopt != NULL)
  1227. return udp_prot.compat_getsockopt(sk, level, optname,
  1228. optval, optlen);
  1229. return udp_prot.getsockopt(sk, level, optname, optval, optlen);
  1230. }
  1231. if (level != SOL_IPV6)
  1232. return -ENOPROTOOPT;
  1233. if (optname == MCAST_MSFILTER)
  1234. return compat_mc_getsockopt(sk, level, optname, optval, optlen,
  1235. ipv6_getsockopt);
  1236. err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
  1237. MSG_CMSG_COMPAT);
  1238. #ifdef CONFIG_NETFILTER
  1239. /* we need to exclude all possible ENOPROTOOPTs except default case */
  1240. if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
  1241. int len;
  1242. if (get_user(len, optlen))
  1243. return -EFAULT;
  1244. err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len);
  1245. if (err >= 0)
  1246. err = put_user(len, optlen);
  1247. }
  1248. #endif
  1249. return err;
  1250. }
  1251. EXPORT_SYMBOL(compat_ipv6_getsockopt);
  1252. #endif