ipv6_sockglue.c 28 KB

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  1. /*
  2. * IPv6 BSD socket options interface
  3. * Linux INET6 implementation
  4. *
  5. * Authors:
  6. * Pedro Roque <roque@di.fc.ul.pt>
  7. *
  8. * Based on linux/net/ipv4/ip_sockglue.c
  9. *
  10. * This program is free software; you can redistribute it and/or
  11. * modify it under the terms of the GNU General Public License
  12. * as published by the Free Software Foundation; either version
  13. * 2 of the License, or (at your option) any later version.
  14. *
  15. * FIXME: Make the setsockopt code POSIX compliant: That is
  16. *
  17. * o Truncate getsockopt returns
  18. * o Return an optlen of the truncated length if need be
  19. *
  20. * Changes:
  21. * David L Stevens <dlstevens@us.ibm.com>:
  22. * - added multicast source filtering API for MLDv2
  23. */
  24. #include <linux/module.h>
  25. #include <linux/capability.h>
  26. #include <linux/errno.h>
  27. #include <linux/types.h>
  28. #include <linux/socket.h>
  29. #include <linux/sockios.h>
  30. #include <linux/net.h>
  31. #include <linux/in6.h>
  32. #include <linux/mroute6.h>
  33. #include <linux/netdevice.h>
  34. #include <linux/if_arp.h>
  35. #include <linux/init.h>
  36. #include <linux/sysctl.h>
  37. #include <linux/netfilter.h>
  38. #include <linux/slab.h>
  39. #include <net/sock.h>
  40. #include <net/snmp.h>
  41. #include <net/ipv6.h>
  42. #include <net/ndisc.h>
  43. #include <net/protocol.h>
  44. #include <net/transp_v6.h>
  45. #include <net/ip6_route.h>
  46. #include <net/addrconf.h>
  47. #include <net/inet_common.h>
  48. #include <net/tcp.h>
  49. #include <net/udp.h>
  50. #include <net/udplite.h>
  51. #include <net/xfrm.h>
  52. #include <net/compat.h>
  53. #include <asm/uaccess.h>
  54. struct ip6_ra_chain *ip6_ra_chain;
  55. DEFINE_RWLOCK(ip6_ra_lock);
  56. int ip6_ra_control(struct sock *sk, int sel)
  57. {
  58. struct ip6_ra_chain *ra, *new_ra, **rap;
  59. /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  60. if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
  61. return -ENOPROTOOPT;
  62. new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  63. write_lock_bh(&ip6_ra_lock);
  64. for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
  65. if (ra->sk == sk) {
  66. if (sel>=0) {
  67. write_unlock_bh(&ip6_ra_lock);
  68. kfree(new_ra);
  69. return -EADDRINUSE;
  70. }
  71. *rap = ra->next;
  72. write_unlock_bh(&ip6_ra_lock);
  73. sock_put(sk);
  74. kfree(ra);
  75. return 0;
  76. }
  77. }
  78. if (new_ra == NULL) {
  79. write_unlock_bh(&ip6_ra_lock);
  80. return -ENOBUFS;
  81. }
  82. new_ra->sk = sk;
  83. new_ra->sel = sel;
  84. new_ra->next = ra;
  85. *rap = new_ra;
  86. sock_hold(sk);
  87. write_unlock_bh(&ip6_ra_lock);
  88. return 0;
  89. }
  90. static
  91. struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
  92. struct ipv6_txoptions *opt)
  93. {
  94. if (inet_sk(sk)->is_icsk) {
  95. if (opt &&
  96. !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
  97. inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
  98. struct inet_connection_sock *icsk = inet_csk(sk);
  99. icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
  100. icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
  101. }
  102. opt = xchg(&inet6_sk(sk)->opt, opt);
  103. } else {
  104. spin_lock(&sk->sk_dst_lock);
  105. opt = xchg(&inet6_sk(sk)->opt, opt);
  106. spin_unlock(&sk->sk_dst_lock);
  107. }
  108. sk_dst_reset(sk);
  109. return opt;
  110. }
  111. static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
  112. char __user *optval, unsigned int optlen)
  113. {
  114. struct ipv6_pinfo *np = inet6_sk(sk);
  115. struct net *net = sock_net(sk);
  116. int val, valbool;
  117. int retv = -ENOPROTOOPT;
  118. if (optval == NULL)
  119. val=0;
  120. else {
  121. if (optlen >= sizeof(int)) {
  122. if (get_user(val, (int __user *) optval))
  123. return -EFAULT;
  124. } else
  125. val = 0;
  126. }
  127. valbool = (val!=0);
  128. if (ip6_mroute_opt(optname))
  129. return ip6_mroute_setsockopt(sk, optname, optval, optlen);
  130. lock_sock(sk);
  131. switch (optname) {
  132. case IPV6_ADDRFORM:
  133. if (optlen < sizeof(int))
  134. goto e_inval;
  135. if (val == PF_INET) {
  136. struct ipv6_txoptions *opt;
  137. struct sk_buff *pktopt;
  138. if (sk->sk_type == SOCK_RAW)
  139. break;
  140. if (sk->sk_protocol == IPPROTO_UDP ||
  141. sk->sk_protocol == IPPROTO_UDPLITE) {
  142. struct udp_sock *up = udp_sk(sk);
  143. if (up->pending == AF_INET6) {
  144. retv = -EBUSY;
  145. break;
  146. }
  147. } else if (sk->sk_protocol != IPPROTO_TCP)
  148. break;
  149. if (sk->sk_state != TCP_ESTABLISHED) {
  150. retv = -ENOTCONN;
  151. break;
  152. }
  153. if (ipv6_only_sock(sk) ||
  154. !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
  155. retv = -EADDRNOTAVAIL;
  156. break;
  157. }
  158. fl6_free_socklist(sk);
  159. ipv6_sock_mc_close(sk);
  160. /*
  161. * Sock is moving from IPv6 to IPv4 (sk_prot), so
  162. * remove it from the refcnt debug socks count in the
  163. * original family...
  164. */
  165. sk_refcnt_debug_dec(sk);
  166. if (sk->sk_protocol == IPPROTO_TCP) {
  167. struct inet_connection_sock *icsk = inet_csk(sk);
  168. local_bh_disable();
  169. sock_prot_inuse_add(net, sk->sk_prot, -1);
  170. sock_prot_inuse_add(net, &tcp_prot, 1);
  171. local_bh_enable();
  172. sk->sk_prot = &tcp_prot;
  173. icsk->icsk_af_ops = &ipv4_specific;
  174. sk->sk_socket->ops = &inet_stream_ops;
  175. sk->sk_family = PF_INET;
  176. tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
  177. } else {
  178. struct proto *prot = &udp_prot;
  179. if (sk->sk_protocol == IPPROTO_UDPLITE)
  180. prot = &udplite_prot;
  181. local_bh_disable();
  182. sock_prot_inuse_add(net, sk->sk_prot, -1);
  183. sock_prot_inuse_add(net, prot, 1);
  184. local_bh_enable();
  185. sk->sk_prot = prot;
  186. sk->sk_socket->ops = &inet_dgram_ops;
  187. sk->sk_family = PF_INET;
  188. }
  189. opt = xchg(&np->opt, NULL);
  190. if (opt)
  191. sock_kfree_s(sk, opt, opt->tot_len);
  192. pktopt = xchg(&np->pktoptions, NULL);
  193. kfree_skb(pktopt);
  194. sk->sk_destruct = inet_sock_destruct;
  195. /*
  196. * ... and add it to the refcnt debug socks count
  197. * in the new family. -acme
  198. */
  199. sk_refcnt_debug_inc(sk);
  200. module_put(THIS_MODULE);
  201. retv = 0;
  202. break;
  203. }
  204. goto e_inval;
  205. case IPV6_V6ONLY:
  206. if (optlen < sizeof(int) ||
  207. inet_sk(sk)->inet_num)
  208. goto e_inval;
  209. np->ipv6only = valbool;
  210. retv = 0;
  211. break;
  212. case IPV6_RECVPKTINFO:
  213. if (optlen < sizeof(int))
  214. goto e_inval;
  215. np->rxopt.bits.rxinfo = valbool;
  216. retv = 0;
  217. break;
  218. case IPV6_2292PKTINFO:
  219. if (optlen < sizeof(int))
  220. goto e_inval;
  221. np->rxopt.bits.rxoinfo = valbool;
  222. retv = 0;
  223. break;
  224. case IPV6_RECVHOPLIMIT:
  225. if (optlen < sizeof(int))
  226. goto e_inval;
  227. np->rxopt.bits.rxhlim = valbool;
  228. retv = 0;
  229. break;
  230. case IPV6_2292HOPLIMIT:
  231. if (optlen < sizeof(int))
  232. goto e_inval;
  233. np->rxopt.bits.rxohlim = valbool;
  234. retv = 0;
  235. break;
  236. case IPV6_RECVRTHDR:
  237. if (optlen < sizeof(int))
  238. goto e_inval;
  239. np->rxopt.bits.srcrt = valbool;
  240. retv = 0;
  241. break;
  242. case IPV6_2292RTHDR:
  243. if (optlen < sizeof(int))
  244. goto e_inval;
  245. np->rxopt.bits.osrcrt = valbool;
  246. retv = 0;
  247. break;
  248. case IPV6_RECVHOPOPTS:
  249. if (optlen < sizeof(int))
  250. goto e_inval;
  251. np->rxopt.bits.hopopts = valbool;
  252. retv = 0;
  253. break;
  254. case IPV6_2292HOPOPTS:
  255. if (optlen < sizeof(int))
  256. goto e_inval;
  257. np->rxopt.bits.ohopopts = valbool;
  258. retv = 0;
  259. break;
  260. case IPV6_RECVDSTOPTS:
  261. if (optlen < sizeof(int))
  262. goto e_inval;
  263. np->rxopt.bits.dstopts = valbool;
  264. retv = 0;
  265. break;
  266. case IPV6_2292DSTOPTS:
  267. if (optlen < sizeof(int))
  268. goto e_inval;
  269. np->rxopt.bits.odstopts = valbool;
  270. retv = 0;
  271. break;
  272. case IPV6_TCLASS:
  273. if (optlen < sizeof(int))
  274. goto e_inval;
  275. if (val < -1 || val > 0xff)
  276. goto e_inval;
  277. /* RFC 3542, 6.5: default traffic class of 0x0 */
  278. if (val == -1)
  279. val = 0;
  280. np->tclass = val;
  281. retv = 0;
  282. break;
  283. case IPV6_RECVTCLASS:
  284. if (optlen < sizeof(int))
  285. goto e_inval;
  286. np->rxopt.bits.rxtclass = valbool;
  287. retv = 0;
  288. break;
  289. case IPV6_FLOWINFO:
  290. if (optlen < sizeof(int))
  291. goto e_inval;
  292. np->rxopt.bits.rxflow = valbool;
  293. retv = 0;
  294. break;
  295. case IPV6_RECVPATHMTU:
  296. if (optlen < sizeof(int))
  297. goto e_inval;
  298. np->rxopt.bits.rxpmtu = valbool;
  299. retv = 0;
  300. break;
  301. case IPV6_TRANSPARENT:
  302. if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
  303. !ns_capable(net->user_ns, CAP_NET_RAW)) {
  304. retv = -EPERM;
  305. break;
  306. }
  307. if (optlen < sizeof(int))
  308. goto e_inval;
  309. /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
  310. inet_sk(sk)->transparent = valbool;
  311. retv = 0;
  312. break;
  313. case IPV6_RECVORIGDSTADDR:
  314. if (optlen < sizeof(int))
  315. goto e_inval;
  316. np->rxopt.bits.rxorigdstaddr = valbool;
  317. retv = 0;
  318. break;
  319. case IPV6_HOPOPTS:
  320. case IPV6_RTHDRDSTOPTS:
  321. case IPV6_RTHDR:
  322. case IPV6_DSTOPTS:
  323. {
  324. struct ipv6_txoptions *opt;
  325. /* remove any sticky options header with a zero option
  326. * length, per RFC3542.
  327. */
  328. if (optlen == 0)
  329. optval = NULL;
  330. else if (optval == NULL)
  331. goto e_inval;
  332. else if (optlen < sizeof(struct ipv6_opt_hdr) ||
  333. optlen & 0x7 || optlen > 8 * 255)
  334. goto e_inval;
  335. /* hop-by-hop / destination options are privileged option */
  336. retv = -EPERM;
  337. if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
  338. break;
  339. opt = ipv6_renew_options(sk, np->opt, optname,
  340. (struct ipv6_opt_hdr __user *)optval,
  341. optlen);
  342. if (IS_ERR(opt)) {
  343. retv = PTR_ERR(opt);
  344. break;
  345. }
  346. /* routing header option needs extra check */
  347. retv = -EINVAL;
  348. if (optname == IPV6_RTHDR && opt && opt->srcrt) {
  349. struct ipv6_rt_hdr *rthdr = opt->srcrt;
  350. switch (rthdr->type) {
  351. #if IS_ENABLED(CONFIG_IPV6_MIP6)
  352. case IPV6_SRCRT_TYPE_2:
  353. if (rthdr->hdrlen != 2 ||
  354. rthdr->segments_left != 1)
  355. goto sticky_done;
  356. break;
  357. #endif
  358. default:
  359. goto sticky_done;
  360. }
  361. }
  362. retv = 0;
  363. opt = ipv6_update_options(sk, opt);
  364. sticky_done:
  365. if (opt)
  366. sock_kfree_s(sk, opt, opt->tot_len);
  367. break;
  368. }
  369. case IPV6_PKTINFO:
  370. {
  371. struct in6_pktinfo pkt;
  372. if (optlen == 0)
  373. goto e_inval;
  374. else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
  375. goto e_inval;
  376. if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
  377. retv = -EFAULT;
  378. break;
  379. }
  380. if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
  381. goto e_inval;
  382. np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
  383. np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
  384. retv = 0;
  385. break;
  386. }
  387. case IPV6_2292PKTOPTIONS:
  388. {
  389. struct ipv6_txoptions *opt = NULL;
  390. struct msghdr msg;
  391. struct flowi6 fl6;
  392. int junk;
  393. memset(&fl6, 0, sizeof(fl6));
  394. fl6.flowi6_oif = sk->sk_bound_dev_if;
  395. fl6.flowi6_mark = sk->sk_mark;
  396. if (optlen == 0)
  397. goto update;
  398. /* 1K is probably excessive
  399. * 1K is surely not enough, 2K per standard header is 16K.
  400. */
  401. retv = -EINVAL;
  402. if (optlen > 64*1024)
  403. break;
  404. opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
  405. retv = -ENOBUFS;
  406. if (opt == NULL)
  407. break;
  408. memset(opt, 0, sizeof(*opt));
  409. opt->tot_len = sizeof(*opt) + optlen;
  410. retv = -EFAULT;
  411. if (copy_from_user(opt+1, optval, optlen))
  412. goto done;
  413. msg.msg_controllen = optlen;
  414. msg.msg_control = (void*)(opt+1);
  415. retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, opt, &junk,
  416. &junk, &junk);
  417. if (retv)
  418. goto done;
  419. update:
  420. retv = 0;
  421. opt = ipv6_update_options(sk, opt);
  422. done:
  423. if (opt)
  424. sock_kfree_s(sk, opt, opt->tot_len);
  425. break;
  426. }
  427. case IPV6_UNICAST_HOPS:
  428. if (optlen < sizeof(int))
  429. goto e_inval;
  430. if (val > 255 || val < -1)
  431. goto e_inval;
  432. np->hop_limit = val;
  433. retv = 0;
  434. break;
  435. case IPV6_MULTICAST_HOPS:
  436. if (sk->sk_type == SOCK_STREAM)
  437. break;
  438. if (optlen < sizeof(int))
  439. goto e_inval;
  440. if (val > 255 || val < -1)
  441. goto e_inval;
  442. np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
  443. retv = 0;
  444. break;
  445. case IPV6_MULTICAST_LOOP:
  446. if (optlen < sizeof(int))
  447. goto e_inval;
  448. if (val != valbool)
  449. goto e_inval;
  450. np->mc_loop = valbool;
  451. retv = 0;
  452. break;
  453. case IPV6_UNICAST_IF:
  454. {
  455. struct net_device *dev = NULL;
  456. int ifindex;
  457. if (optlen != sizeof(int))
  458. goto e_inval;
  459. ifindex = (__force int)ntohl((__force __be32)val);
  460. if (ifindex == 0) {
  461. np->ucast_oif = 0;
  462. retv = 0;
  463. break;
  464. }
  465. dev = dev_get_by_index(net, ifindex);
  466. retv = -EADDRNOTAVAIL;
  467. if (!dev)
  468. break;
  469. dev_put(dev);
  470. retv = -EINVAL;
  471. if (sk->sk_bound_dev_if)
  472. break;
  473. np->ucast_oif = ifindex;
  474. retv = 0;
  475. break;
  476. }
  477. case IPV6_MULTICAST_IF:
  478. if (sk->sk_type == SOCK_STREAM)
  479. break;
  480. if (optlen < sizeof(int))
  481. goto e_inval;
  482. if (val) {
  483. struct net_device *dev;
  484. if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
  485. goto e_inval;
  486. dev = dev_get_by_index(net, val);
  487. if (!dev) {
  488. retv = -ENODEV;
  489. break;
  490. }
  491. dev_put(dev);
  492. }
  493. np->mcast_oif = val;
  494. retv = 0;
  495. break;
  496. case IPV6_ADD_MEMBERSHIP:
  497. case IPV6_DROP_MEMBERSHIP:
  498. {
  499. struct ipv6_mreq mreq;
  500. if (optlen < sizeof(struct ipv6_mreq))
  501. goto e_inval;
  502. retv = -EPROTO;
  503. if (inet_sk(sk)->is_icsk)
  504. break;
  505. retv = -EFAULT;
  506. if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
  507. break;
  508. if (optname == IPV6_ADD_MEMBERSHIP)
  509. retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
  510. else
  511. retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
  512. break;
  513. }
  514. case IPV6_JOIN_ANYCAST:
  515. case IPV6_LEAVE_ANYCAST:
  516. {
  517. struct ipv6_mreq mreq;
  518. if (optlen < sizeof(struct ipv6_mreq))
  519. goto e_inval;
  520. retv = -EFAULT;
  521. if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
  522. break;
  523. if (optname == IPV6_JOIN_ANYCAST)
  524. retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
  525. else
  526. retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
  527. break;
  528. }
  529. case MCAST_JOIN_GROUP:
  530. case MCAST_LEAVE_GROUP:
  531. {
  532. struct group_req greq;
  533. struct sockaddr_in6 *psin6;
  534. if (optlen < sizeof(struct group_req))
  535. goto e_inval;
  536. retv = -EFAULT;
  537. if (copy_from_user(&greq, optval, sizeof(struct group_req)))
  538. break;
  539. if (greq.gr_group.ss_family != AF_INET6) {
  540. retv = -EADDRNOTAVAIL;
  541. break;
  542. }
  543. psin6 = (struct sockaddr_in6 *)&greq.gr_group;
  544. if (optname == MCAST_JOIN_GROUP)
  545. retv = ipv6_sock_mc_join(sk, greq.gr_interface,
  546. &psin6->sin6_addr);
  547. else
  548. retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
  549. &psin6->sin6_addr);
  550. break;
  551. }
  552. case MCAST_JOIN_SOURCE_GROUP:
  553. case MCAST_LEAVE_SOURCE_GROUP:
  554. case MCAST_BLOCK_SOURCE:
  555. case MCAST_UNBLOCK_SOURCE:
  556. {
  557. struct group_source_req greqs;
  558. int omode, add;
  559. if (optlen < sizeof(struct group_source_req))
  560. goto e_inval;
  561. if (copy_from_user(&greqs, optval, sizeof(greqs))) {
  562. retv = -EFAULT;
  563. break;
  564. }
  565. if (greqs.gsr_group.ss_family != AF_INET6 ||
  566. greqs.gsr_source.ss_family != AF_INET6) {
  567. retv = -EADDRNOTAVAIL;
  568. break;
  569. }
  570. if (optname == MCAST_BLOCK_SOURCE) {
  571. omode = MCAST_EXCLUDE;
  572. add = 1;
  573. } else if (optname == MCAST_UNBLOCK_SOURCE) {
  574. omode = MCAST_EXCLUDE;
  575. add = 0;
  576. } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
  577. struct sockaddr_in6 *psin6;
  578. psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
  579. retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
  580. &psin6->sin6_addr);
  581. /* prior join w/ different source is ok */
  582. if (retv && retv != -EADDRINUSE)
  583. break;
  584. omode = MCAST_INCLUDE;
  585. add = 1;
  586. } else /* MCAST_LEAVE_SOURCE_GROUP */ {
  587. omode = MCAST_INCLUDE;
  588. add = 0;
  589. }
  590. retv = ip6_mc_source(add, omode, sk, &greqs);
  591. break;
  592. }
  593. case MCAST_MSFILTER:
  594. {
  595. struct group_filter *gsf;
  596. if (optlen < GROUP_FILTER_SIZE(0))
  597. goto e_inval;
  598. if (optlen > sysctl_optmem_max) {
  599. retv = -ENOBUFS;
  600. break;
  601. }
  602. gsf = kmalloc(optlen,GFP_KERNEL);
  603. if (!gsf) {
  604. retv = -ENOBUFS;
  605. break;
  606. }
  607. retv = -EFAULT;
  608. if (copy_from_user(gsf, optval, optlen)) {
  609. kfree(gsf);
  610. break;
  611. }
  612. /* numsrc >= (4G-140)/128 overflow in 32 bits */
  613. if (gsf->gf_numsrc >= 0x1ffffffU ||
  614. gsf->gf_numsrc > sysctl_mld_max_msf) {
  615. kfree(gsf);
  616. retv = -ENOBUFS;
  617. break;
  618. }
  619. if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
  620. kfree(gsf);
  621. retv = -EINVAL;
  622. break;
  623. }
  624. retv = ip6_mc_msfilter(sk, gsf);
  625. kfree(gsf);
  626. break;
  627. }
  628. case IPV6_ROUTER_ALERT:
  629. if (optlen < sizeof(int))
  630. goto e_inval;
  631. retv = ip6_ra_control(sk, val);
  632. break;
  633. case IPV6_MTU_DISCOVER:
  634. if (optlen < sizeof(int))
  635. goto e_inval;
  636. if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
  637. goto e_inval;
  638. np->pmtudisc = val;
  639. retv = 0;
  640. break;
  641. case IPV6_MTU:
  642. if (optlen < sizeof(int))
  643. goto e_inval;
  644. if (val && val < IPV6_MIN_MTU)
  645. goto e_inval;
  646. np->frag_size = val;
  647. retv = 0;
  648. break;
  649. case IPV6_RECVERR:
  650. if (optlen < sizeof(int))
  651. goto e_inval;
  652. np->recverr = valbool;
  653. if (!val)
  654. skb_queue_purge(&sk->sk_error_queue);
  655. retv = 0;
  656. break;
  657. case IPV6_FLOWINFO_SEND:
  658. if (optlen < sizeof(int))
  659. goto e_inval;
  660. np->sndflow = valbool;
  661. retv = 0;
  662. break;
  663. case IPV6_FLOWLABEL_MGR:
  664. retv = ipv6_flowlabel_opt(sk, optval, optlen);
  665. break;
  666. case IPV6_IPSEC_POLICY:
  667. case IPV6_XFRM_POLICY:
  668. retv = -EPERM;
  669. if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
  670. break;
  671. retv = xfrm_user_policy(sk, optname, optval, optlen);
  672. break;
  673. case IPV6_ADDR_PREFERENCES:
  674. {
  675. unsigned int pref = 0;
  676. unsigned int prefmask = ~0;
  677. if (optlen < sizeof(int))
  678. goto e_inval;
  679. retv = -EINVAL;
  680. /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
  681. switch (val & (IPV6_PREFER_SRC_PUBLIC|
  682. IPV6_PREFER_SRC_TMP|
  683. IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
  684. case IPV6_PREFER_SRC_PUBLIC:
  685. pref |= IPV6_PREFER_SRC_PUBLIC;
  686. break;
  687. case IPV6_PREFER_SRC_TMP:
  688. pref |= IPV6_PREFER_SRC_TMP;
  689. break;
  690. case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
  691. break;
  692. case 0:
  693. goto pref_skip_pubtmp;
  694. default:
  695. goto e_inval;
  696. }
  697. prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
  698. IPV6_PREFER_SRC_TMP);
  699. pref_skip_pubtmp:
  700. /* check HOME/COA conflicts */
  701. switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
  702. case IPV6_PREFER_SRC_HOME:
  703. break;
  704. case IPV6_PREFER_SRC_COA:
  705. pref |= IPV6_PREFER_SRC_COA;
  706. case 0:
  707. goto pref_skip_coa;
  708. default:
  709. goto e_inval;
  710. }
  711. prefmask &= ~IPV6_PREFER_SRC_COA;
  712. pref_skip_coa:
  713. /* check CGA/NONCGA conflicts */
  714. switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
  715. case IPV6_PREFER_SRC_CGA:
  716. case IPV6_PREFER_SRC_NONCGA:
  717. case 0:
  718. break;
  719. default:
  720. goto e_inval;
  721. }
  722. np->srcprefs = (np->srcprefs & prefmask) | pref;
  723. retv = 0;
  724. break;
  725. }
  726. case IPV6_MINHOPCOUNT:
  727. if (optlen < sizeof(int))
  728. goto e_inval;
  729. if (val < 0 || val > 255)
  730. goto e_inval;
  731. np->min_hopcount = val;
  732. retv = 0;
  733. break;
  734. case IPV6_DONTFRAG:
  735. np->dontfrag = valbool;
  736. retv = 0;
  737. break;
  738. }
  739. release_sock(sk);
  740. return retv;
  741. e_inval:
  742. release_sock(sk);
  743. return -EINVAL;
  744. }
  745. int ipv6_setsockopt(struct sock *sk, int level, int optname,
  746. char __user *optval, unsigned int optlen)
  747. {
  748. int err;
  749. if (level == SOL_IP && sk->sk_type != SOCK_RAW)
  750. return udp_prot.setsockopt(sk, level, optname, optval, optlen);
  751. if (level != SOL_IPV6)
  752. return -ENOPROTOOPT;
  753. err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
  754. #ifdef CONFIG_NETFILTER
  755. /* we need to exclude all possible ENOPROTOOPTs except default case */
  756. if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
  757. optname != IPV6_XFRM_POLICY) {
  758. lock_sock(sk);
  759. err = nf_setsockopt(sk, PF_INET6, optname, optval,
  760. optlen);
  761. release_sock(sk);
  762. }
  763. #endif
  764. return err;
  765. }
  766. EXPORT_SYMBOL(ipv6_setsockopt);
  767. #ifdef CONFIG_COMPAT
  768. int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
  769. char __user *optval, unsigned int optlen)
  770. {
  771. int err;
  772. if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
  773. if (udp_prot.compat_setsockopt != NULL)
  774. return udp_prot.compat_setsockopt(sk, level, optname,
  775. optval, optlen);
  776. return udp_prot.setsockopt(sk, level, optname, optval, optlen);
  777. }
  778. if (level != SOL_IPV6)
  779. return -ENOPROTOOPT;
  780. if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
  781. return compat_mc_setsockopt(sk, level, optname, optval, optlen,
  782. ipv6_setsockopt);
  783. err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
  784. #ifdef CONFIG_NETFILTER
  785. /* we need to exclude all possible ENOPROTOOPTs except default case */
  786. if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
  787. optname != IPV6_XFRM_POLICY) {
  788. lock_sock(sk);
  789. err = compat_nf_setsockopt(sk, PF_INET6, optname,
  790. optval, optlen);
  791. release_sock(sk);
  792. }
  793. #endif
  794. return err;
  795. }
  796. EXPORT_SYMBOL(compat_ipv6_setsockopt);
  797. #endif
  798. static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
  799. int optname, char __user *optval, int len)
  800. {
  801. struct ipv6_opt_hdr *hdr;
  802. if (!opt)
  803. return 0;
  804. switch(optname) {
  805. case IPV6_HOPOPTS:
  806. hdr = opt->hopopt;
  807. break;
  808. case IPV6_RTHDRDSTOPTS:
  809. hdr = opt->dst0opt;
  810. break;
  811. case IPV6_RTHDR:
  812. hdr = (struct ipv6_opt_hdr *)opt->srcrt;
  813. break;
  814. case IPV6_DSTOPTS:
  815. hdr = opt->dst1opt;
  816. break;
  817. default:
  818. return -EINVAL; /* should not happen */
  819. }
  820. if (!hdr)
  821. return 0;
  822. len = min_t(unsigned int, len, ipv6_optlen(hdr));
  823. if (copy_to_user(optval, hdr, len))
  824. return -EFAULT;
  825. return len;
  826. }
  827. static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
  828. char __user *optval, int __user *optlen, unsigned int flags)
  829. {
  830. struct ipv6_pinfo *np = inet6_sk(sk);
  831. int len;
  832. int val;
  833. if (ip6_mroute_opt(optname))
  834. return ip6_mroute_getsockopt(sk, optname, optval, optlen);
  835. if (get_user(len, optlen))
  836. return -EFAULT;
  837. switch (optname) {
  838. case IPV6_ADDRFORM:
  839. if (sk->sk_protocol != IPPROTO_UDP &&
  840. sk->sk_protocol != IPPROTO_UDPLITE &&
  841. sk->sk_protocol != IPPROTO_TCP)
  842. return -ENOPROTOOPT;
  843. if (sk->sk_state != TCP_ESTABLISHED)
  844. return -ENOTCONN;
  845. val = sk->sk_family;
  846. break;
  847. case MCAST_MSFILTER:
  848. {
  849. struct group_filter gsf;
  850. int err;
  851. if (len < GROUP_FILTER_SIZE(0))
  852. return -EINVAL;
  853. if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
  854. return -EFAULT;
  855. if (gsf.gf_group.ss_family != AF_INET6)
  856. return -EADDRNOTAVAIL;
  857. lock_sock(sk);
  858. err = ip6_mc_msfget(sk, &gsf,
  859. (struct group_filter __user *)optval, optlen);
  860. release_sock(sk);
  861. return err;
  862. }
  863. case IPV6_2292PKTOPTIONS:
  864. {
  865. struct msghdr msg;
  866. struct sk_buff *skb;
  867. if (sk->sk_type != SOCK_STREAM)
  868. return -ENOPROTOOPT;
  869. msg.msg_control = optval;
  870. msg.msg_controllen = len;
  871. msg.msg_flags = flags;
  872. lock_sock(sk);
  873. skb = np->pktoptions;
  874. if (skb)
  875. atomic_inc(&skb->users);
  876. release_sock(sk);
  877. if (skb) {
  878. int err = ip6_datagram_recv_ctl(sk, &msg, skb);
  879. kfree_skb(skb);
  880. if (err)
  881. return err;
  882. } else {
  883. if (np->rxopt.bits.rxinfo) {
  884. struct in6_pktinfo src_info;
  885. src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
  886. np->sticky_pktinfo.ipi6_ifindex;
  887. src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
  888. put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
  889. }
  890. if (np->rxopt.bits.rxhlim) {
  891. int hlim = np->mcast_hops;
  892. put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
  893. }
  894. if (np->rxopt.bits.rxtclass) {
  895. int tclass = np->rcv_tclass;
  896. put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
  897. }
  898. if (np->rxopt.bits.rxoinfo) {
  899. struct in6_pktinfo src_info;
  900. src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
  901. np->sticky_pktinfo.ipi6_ifindex;
  902. src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
  903. np->sticky_pktinfo.ipi6_addr;
  904. put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
  905. }
  906. if (np->rxopt.bits.rxohlim) {
  907. int hlim = np->mcast_hops;
  908. put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
  909. }
  910. }
  911. len -= msg.msg_controllen;
  912. return put_user(len, optlen);
  913. }
  914. case IPV6_MTU:
  915. {
  916. struct dst_entry *dst;
  917. val = 0;
  918. rcu_read_lock();
  919. dst = __sk_dst_get(sk);
  920. if (dst)
  921. val = dst_mtu(dst);
  922. rcu_read_unlock();
  923. if (!val)
  924. return -ENOTCONN;
  925. break;
  926. }
  927. case IPV6_V6ONLY:
  928. val = np->ipv6only;
  929. break;
  930. case IPV6_RECVPKTINFO:
  931. val = np->rxopt.bits.rxinfo;
  932. break;
  933. case IPV6_2292PKTINFO:
  934. val = np->rxopt.bits.rxoinfo;
  935. break;
  936. case IPV6_RECVHOPLIMIT:
  937. val = np->rxopt.bits.rxhlim;
  938. break;
  939. case IPV6_2292HOPLIMIT:
  940. val = np->rxopt.bits.rxohlim;
  941. break;
  942. case IPV6_RECVRTHDR:
  943. val = np->rxopt.bits.srcrt;
  944. break;
  945. case IPV6_2292RTHDR:
  946. val = np->rxopt.bits.osrcrt;
  947. break;
  948. case IPV6_HOPOPTS:
  949. case IPV6_RTHDRDSTOPTS:
  950. case IPV6_RTHDR:
  951. case IPV6_DSTOPTS:
  952. {
  953. lock_sock(sk);
  954. len = ipv6_getsockopt_sticky(sk, np->opt,
  955. optname, optval, len);
  956. release_sock(sk);
  957. /* check if ipv6_getsockopt_sticky() returns err code */
  958. if (len < 0)
  959. return len;
  960. return put_user(len, optlen);
  961. }
  962. case IPV6_RECVHOPOPTS:
  963. val = np->rxopt.bits.hopopts;
  964. break;
  965. case IPV6_2292HOPOPTS:
  966. val = np->rxopt.bits.ohopopts;
  967. break;
  968. case IPV6_RECVDSTOPTS:
  969. val = np->rxopt.bits.dstopts;
  970. break;
  971. case IPV6_2292DSTOPTS:
  972. val = np->rxopt.bits.odstopts;
  973. break;
  974. case IPV6_TCLASS:
  975. val = np->tclass;
  976. break;
  977. case IPV6_RECVTCLASS:
  978. val = np->rxopt.bits.rxtclass;
  979. break;
  980. case IPV6_FLOWINFO:
  981. val = np->rxopt.bits.rxflow;
  982. break;
  983. case IPV6_RECVPATHMTU:
  984. val = np->rxopt.bits.rxpmtu;
  985. break;
  986. case IPV6_PATHMTU:
  987. {
  988. struct dst_entry *dst;
  989. struct ip6_mtuinfo mtuinfo;
  990. if (len < sizeof(mtuinfo))
  991. return -EINVAL;
  992. len = sizeof(mtuinfo);
  993. memset(&mtuinfo, 0, sizeof(mtuinfo));
  994. rcu_read_lock();
  995. dst = __sk_dst_get(sk);
  996. if (dst)
  997. mtuinfo.ip6m_mtu = dst_mtu(dst);
  998. rcu_read_unlock();
  999. if (!mtuinfo.ip6m_mtu)
  1000. return -ENOTCONN;
  1001. if (put_user(len, optlen))
  1002. return -EFAULT;
  1003. if (copy_to_user(optval, &mtuinfo, len))
  1004. return -EFAULT;
  1005. return 0;
  1006. break;
  1007. }
  1008. case IPV6_TRANSPARENT:
  1009. val = inet_sk(sk)->transparent;
  1010. break;
  1011. case IPV6_RECVORIGDSTADDR:
  1012. val = np->rxopt.bits.rxorigdstaddr;
  1013. break;
  1014. case IPV6_UNICAST_HOPS:
  1015. case IPV6_MULTICAST_HOPS:
  1016. {
  1017. struct dst_entry *dst;
  1018. if (optname == IPV6_UNICAST_HOPS)
  1019. val = np->hop_limit;
  1020. else
  1021. val = np->mcast_hops;
  1022. if (val < 0) {
  1023. rcu_read_lock();
  1024. dst = __sk_dst_get(sk);
  1025. if (dst)
  1026. val = ip6_dst_hoplimit(dst);
  1027. rcu_read_unlock();
  1028. }
  1029. if (val < 0)
  1030. val = sock_net(sk)->ipv6.devconf_all->hop_limit;
  1031. break;
  1032. }
  1033. case IPV6_MULTICAST_LOOP:
  1034. val = np->mc_loop;
  1035. break;
  1036. case IPV6_MULTICAST_IF:
  1037. val = np->mcast_oif;
  1038. break;
  1039. case IPV6_UNICAST_IF:
  1040. val = (__force int)htonl((__u32) np->ucast_oif);
  1041. break;
  1042. case IPV6_MTU_DISCOVER:
  1043. val = np->pmtudisc;
  1044. break;
  1045. case IPV6_RECVERR:
  1046. val = np->recverr;
  1047. break;
  1048. case IPV6_FLOWINFO_SEND:
  1049. val = np->sndflow;
  1050. break;
  1051. case IPV6_ADDR_PREFERENCES:
  1052. val = 0;
  1053. if (np->srcprefs & IPV6_PREFER_SRC_TMP)
  1054. val |= IPV6_PREFER_SRC_TMP;
  1055. else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
  1056. val |= IPV6_PREFER_SRC_PUBLIC;
  1057. else {
  1058. /* XXX: should we return system default? */
  1059. val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
  1060. }
  1061. if (np->srcprefs & IPV6_PREFER_SRC_COA)
  1062. val |= IPV6_PREFER_SRC_COA;
  1063. else
  1064. val |= IPV6_PREFER_SRC_HOME;
  1065. break;
  1066. case IPV6_MINHOPCOUNT:
  1067. val = np->min_hopcount;
  1068. break;
  1069. case IPV6_DONTFRAG:
  1070. val = np->dontfrag;
  1071. break;
  1072. default:
  1073. return -ENOPROTOOPT;
  1074. }
  1075. len = min_t(unsigned int, sizeof(int), len);
  1076. if(put_user(len, optlen))
  1077. return -EFAULT;
  1078. if(copy_to_user(optval,&val,len))
  1079. return -EFAULT;
  1080. return 0;
  1081. }
  1082. int ipv6_getsockopt(struct sock *sk, int level, int optname,
  1083. char __user *optval, int __user *optlen)
  1084. {
  1085. int err;
  1086. if (level == SOL_IP && sk->sk_type != SOCK_RAW)
  1087. return udp_prot.getsockopt(sk, level, optname, optval, optlen);
  1088. if(level != SOL_IPV6)
  1089. return -ENOPROTOOPT;
  1090. err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
  1091. #ifdef CONFIG_NETFILTER
  1092. /* we need to exclude all possible ENOPROTOOPTs except default case */
  1093. if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
  1094. int len;
  1095. if (get_user(len, optlen))
  1096. return -EFAULT;
  1097. lock_sock(sk);
  1098. err = nf_getsockopt(sk, PF_INET6, optname, optval,
  1099. &len);
  1100. release_sock(sk);
  1101. if (err >= 0)
  1102. err = put_user(len, optlen);
  1103. }
  1104. #endif
  1105. return err;
  1106. }
  1107. EXPORT_SYMBOL(ipv6_getsockopt);
  1108. #ifdef CONFIG_COMPAT
  1109. int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
  1110. char __user *optval, int __user *optlen)
  1111. {
  1112. int err;
  1113. if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
  1114. if (udp_prot.compat_getsockopt != NULL)
  1115. return udp_prot.compat_getsockopt(sk, level, optname,
  1116. optval, optlen);
  1117. return udp_prot.getsockopt(sk, level, optname, optval, optlen);
  1118. }
  1119. if (level != SOL_IPV6)
  1120. return -ENOPROTOOPT;
  1121. if (optname == MCAST_MSFILTER)
  1122. return compat_mc_getsockopt(sk, level, optname, optval, optlen,
  1123. ipv6_getsockopt);
  1124. err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
  1125. MSG_CMSG_COMPAT);
  1126. #ifdef CONFIG_NETFILTER
  1127. /* we need to exclude all possible ENOPROTOOPTs except default case */
  1128. if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
  1129. int len;
  1130. if (get_user(len, optlen))
  1131. return -EFAULT;
  1132. lock_sock(sk);
  1133. err = compat_nf_getsockopt(sk, PF_INET6,
  1134. optname, optval, &len);
  1135. release_sock(sk);
  1136. if (err >= 0)
  1137. err = put_user(len, optlen);
  1138. }
  1139. #endif
  1140. return err;
  1141. }
  1142. EXPORT_SYMBOL(compat_ipv6_getsockopt);
  1143. #endif