ipv6_sockglue.c 27 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(&np->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 (optlen < sizeof(int))
  303. goto e_inval;
  304. /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
  305. inet_sk(sk)->transparent = valbool;
  306. retv = 0;
  307. break;
  308. case IPV6_RECVORIGDSTADDR:
  309. if (optlen < sizeof(int))
  310. goto e_inval;
  311. np->rxopt.bits.rxorigdstaddr = valbool;
  312. retv = 0;
  313. break;
  314. case IPV6_HOPOPTS:
  315. case IPV6_RTHDRDSTOPTS:
  316. case IPV6_RTHDR:
  317. case IPV6_DSTOPTS:
  318. {
  319. struct ipv6_txoptions *opt;
  320. /* remove any sticky options header with a zero option
  321. * length, per RFC3542.
  322. */
  323. if (optlen == 0)
  324. optval = NULL;
  325. else if (optval == NULL)
  326. goto e_inval;
  327. else if (optlen < sizeof(struct ipv6_opt_hdr) ||
  328. optlen & 0x7 || optlen > 8 * 255)
  329. goto e_inval;
  330. /* hop-by-hop / destination options are privileged option */
  331. retv = -EPERM;
  332. if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
  333. break;
  334. opt = ipv6_renew_options(sk, np->opt, optname,
  335. (struct ipv6_opt_hdr __user *)optval,
  336. optlen);
  337. if (IS_ERR(opt)) {
  338. retv = PTR_ERR(opt);
  339. break;
  340. }
  341. /* routing header option needs extra check */
  342. retv = -EINVAL;
  343. if (optname == IPV6_RTHDR && opt && opt->srcrt) {
  344. struct ipv6_rt_hdr *rthdr = opt->srcrt;
  345. switch (rthdr->type) {
  346. #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  347. case IPV6_SRCRT_TYPE_2:
  348. if (rthdr->hdrlen != 2 ||
  349. rthdr->segments_left != 1)
  350. goto sticky_done;
  351. break;
  352. #endif
  353. default:
  354. goto sticky_done;
  355. }
  356. }
  357. retv = 0;
  358. opt = ipv6_update_options(sk, opt);
  359. sticky_done:
  360. if (opt)
  361. sock_kfree_s(sk, opt, opt->tot_len);
  362. break;
  363. }
  364. case IPV6_PKTINFO:
  365. {
  366. struct in6_pktinfo pkt;
  367. if (optlen == 0)
  368. goto e_inval;
  369. else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
  370. goto e_inval;
  371. if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
  372. retv = -EFAULT;
  373. break;
  374. }
  375. if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
  376. goto e_inval;
  377. np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
  378. ipv6_addr_copy(&np->sticky_pktinfo.ipi6_addr, &pkt.ipi6_addr);
  379. retv = 0;
  380. break;
  381. }
  382. case IPV6_2292PKTOPTIONS:
  383. {
  384. struct ipv6_txoptions *opt = NULL;
  385. struct msghdr msg;
  386. struct flowi fl;
  387. int junk;
  388. fl.fl6_flowlabel = 0;
  389. fl.oif = sk->sk_bound_dev_if;
  390. fl.mark = sk->sk_mark;
  391. if (optlen == 0)
  392. goto update;
  393. /* 1K is probably excessive
  394. * 1K is surely not enough, 2K per standard header is 16K.
  395. */
  396. retv = -EINVAL;
  397. if (optlen > 64*1024)
  398. break;
  399. opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
  400. retv = -ENOBUFS;
  401. if (opt == NULL)
  402. break;
  403. memset(opt, 0, sizeof(*opt));
  404. opt->tot_len = sizeof(*opt) + optlen;
  405. retv = -EFAULT;
  406. if (copy_from_user(opt+1, optval, optlen))
  407. goto done;
  408. msg.msg_controllen = optlen;
  409. msg.msg_control = (void*)(opt+1);
  410. retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk,
  411. &junk);
  412. if (retv)
  413. goto done;
  414. update:
  415. retv = 0;
  416. opt = ipv6_update_options(sk, opt);
  417. done:
  418. if (opt)
  419. sock_kfree_s(sk, opt, opt->tot_len);
  420. break;
  421. }
  422. case IPV6_UNICAST_HOPS:
  423. if (optlen < sizeof(int))
  424. goto e_inval;
  425. if (val > 255 || val < -1)
  426. goto e_inval;
  427. np->hop_limit = val;
  428. retv = 0;
  429. break;
  430. case IPV6_MULTICAST_HOPS:
  431. if (sk->sk_type == SOCK_STREAM)
  432. break;
  433. if (optlen < sizeof(int))
  434. goto e_inval;
  435. if (val > 255 || val < -1)
  436. goto e_inval;
  437. np->mcast_hops = val;
  438. retv = 0;
  439. break;
  440. case IPV6_MULTICAST_LOOP:
  441. if (optlen < sizeof(int))
  442. goto e_inval;
  443. if (val != valbool)
  444. goto e_inval;
  445. np->mc_loop = valbool;
  446. retv = 0;
  447. break;
  448. case IPV6_MULTICAST_IF:
  449. if (sk->sk_type == SOCK_STREAM)
  450. break;
  451. if (optlen < sizeof(int))
  452. goto e_inval;
  453. if (val) {
  454. struct net_device *dev;
  455. if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
  456. goto e_inval;
  457. dev = dev_get_by_index(net, val);
  458. if (!dev) {
  459. retv = -ENODEV;
  460. break;
  461. }
  462. dev_put(dev);
  463. }
  464. np->mcast_oif = val;
  465. retv = 0;
  466. break;
  467. case IPV6_ADD_MEMBERSHIP:
  468. case IPV6_DROP_MEMBERSHIP:
  469. {
  470. struct ipv6_mreq mreq;
  471. if (optlen < sizeof(struct ipv6_mreq))
  472. goto e_inval;
  473. retv = -EPROTO;
  474. if (inet_sk(sk)->is_icsk)
  475. break;
  476. retv = -EFAULT;
  477. if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
  478. break;
  479. if (optname == IPV6_ADD_MEMBERSHIP)
  480. retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
  481. else
  482. retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
  483. break;
  484. }
  485. case IPV6_JOIN_ANYCAST:
  486. case IPV6_LEAVE_ANYCAST:
  487. {
  488. struct ipv6_mreq mreq;
  489. if (optlen < sizeof(struct ipv6_mreq))
  490. goto e_inval;
  491. retv = -EFAULT;
  492. if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
  493. break;
  494. if (optname == IPV6_JOIN_ANYCAST)
  495. retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
  496. else
  497. retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
  498. break;
  499. }
  500. case MCAST_JOIN_GROUP:
  501. case MCAST_LEAVE_GROUP:
  502. {
  503. struct group_req greq;
  504. struct sockaddr_in6 *psin6;
  505. if (optlen < sizeof(struct group_req))
  506. goto e_inval;
  507. retv = -EFAULT;
  508. if (copy_from_user(&greq, optval, sizeof(struct group_req)))
  509. break;
  510. if (greq.gr_group.ss_family != AF_INET6) {
  511. retv = -EADDRNOTAVAIL;
  512. break;
  513. }
  514. psin6 = (struct sockaddr_in6 *)&greq.gr_group;
  515. if (optname == MCAST_JOIN_GROUP)
  516. retv = ipv6_sock_mc_join(sk, greq.gr_interface,
  517. &psin6->sin6_addr);
  518. else
  519. retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
  520. &psin6->sin6_addr);
  521. break;
  522. }
  523. case MCAST_JOIN_SOURCE_GROUP:
  524. case MCAST_LEAVE_SOURCE_GROUP:
  525. case MCAST_BLOCK_SOURCE:
  526. case MCAST_UNBLOCK_SOURCE:
  527. {
  528. struct group_source_req greqs;
  529. int omode, add;
  530. if (optlen < sizeof(struct group_source_req))
  531. goto e_inval;
  532. if (copy_from_user(&greqs, optval, sizeof(greqs))) {
  533. retv = -EFAULT;
  534. break;
  535. }
  536. if (greqs.gsr_group.ss_family != AF_INET6 ||
  537. greqs.gsr_source.ss_family != AF_INET6) {
  538. retv = -EADDRNOTAVAIL;
  539. break;
  540. }
  541. if (optname == MCAST_BLOCK_SOURCE) {
  542. omode = MCAST_EXCLUDE;
  543. add = 1;
  544. } else if (optname == MCAST_UNBLOCK_SOURCE) {
  545. omode = MCAST_EXCLUDE;
  546. add = 0;
  547. } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
  548. struct sockaddr_in6 *psin6;
  549. psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
  550. retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
  551. &psin6->sin6_addr);
  552. /* prior join w/ different source is ok */
  553. if (retv && retv != -EADDRINUSE)
  554. break;
  555. omode = MCAST_INCLUDE;
  556. add = 1;
  557. } else /* MCAST_LEAVE_SOURCE_GROUP */ {
  558. omode = MCAST_INCLUDE;
  559. add = 0;
  560. }
  561. retv = ip6_mc_source(add, omode, sk, &greqs);
  562. break;
  563. }
  564. case MCAST_MSFILTER:
  565. {
  566. extern int sysctl_mld_max_msf;
  567. struct group_filter *gsf;
  568. if (optlen < GROUP_FILTER_SIZE(0))
  569. goto e_inval;
  570. if (optlen > sysctl_optmem_max) {
  571. retv = -ENOBUFS;
  572. break;
  573. }
  574. gsf = kmalloc(optlen,GFP_KERNEL);
  575. if (!gsf) {
  576. retv = -ENOBUFS;
  577. break;
  578. }
  579. retv = -EFAULT;
  580. if (copy_from_user(gsf, optval, optlen)) {
  581. kfree(gsf);
  582. break;
  583. }
  584. /* numsrc >= (4G-140)/128 overflow in 32 bits */
  585. if (gsf->gf_numsrc >= 0x1ffffffU ||
  586. gsf->gf_numsrc > sysctl_mld_max_msf) {
  587. kfree(gsf);
  588. retv = -ENOBUFS;
  589. break;
  590. }
  591. if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
  592. kfree(gsf);
  593. retv = -EINVAL;
  594. break;
  595. }
  596. retv = ip6_mc_msfilter(sk, gsf);
  597. kfree(gsf);
  598. break;
  599. }
  600. case IPV6_ROUTER_ALERT:
  601. if (optlen < sizeof(int))
  602. goto e_inval;
  603. retv = ip6_ra_control(sk, val);
  604. break;
  605. case IPV6_MTU_DISCOVER:
  606. if (optlen < sizeof(int))
  607. goto e_inval;
  608. if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
  609. goto e_inval;
  610. np->pmtudisc = val;
  611. retv = 0;
  612. break;
  613. case IPV6_MTU:
  614. if (optlen < sizeof(int))
  615. goto e_inval;
  616. if (val && val < IPV6_MIN_MTU)
  617. goto e_inval;
  618. np->frag_size = val;
  619. retv = 0;
  620. break;
  621. case IPV6_RECVERR:
  622. if (optlen < sizeof(int))
  623. goto e_inval;
  624. np->recverr = valbool;
  625. if (!val)
  626. skb_queue_purge(&sk->sk_error_queue);
  627. retv = 0;
  628. break;
  629. case IPV6_FLOWINFO_SEND:
  630. if (optlen < sizeof(int))
  631. goto e_inval;
  632. np->sndflow = valbool;
  633. retv = 0;
  634. break;
  635. case IPV6_FLOWLABEL_MGR:
  636. retv = ipv6_flowlabel_opt(sk, optval, optlen);
  637. break;
  638. case IPV6_IPSEC_POLICY:
  639. case IPV6_XFRM_POLICY:
  640. retv = -EPERM;
  641. if (!capable(CAP_NET_ADMIN))
  642. break;
  643. retv = xfrm_user_policy(sk, optname, optval, optlen);
  644. break;
  645. case IPV6_ADDR_PREFERENCES:
  646. {
  647. unsigned int pref = 0;
  648. unsigned int prefmask = ~0;
  649. if (optlen < sizeof(int))
  650. goto e_inval;
  651. retv = -EINVAL;
  652. /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
  653. switch (val & (IPV6_PREFER_SRC_PUBLIC|
  654. IPV6_PREFER_SRC_TMP|
  655. IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
  656. case IPV6_PREFER_SRC_PUBLIC:
  657. pref |= IPV6_PREFER_SRC_PUBLIC;
  658. break;
  659. case IPV6_PREFER_SRC_TMP:
  660. pref |= IPV6_PREFER_SRC_TMP;
  661. break;
  662. case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
  663. break;
  664. case 0:
  665. goto pref_skip_pubtmp;
  666. default:
  667. goto e_inval;
  668. }
  669. prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
  670. IPV6_PREFER_SRC_TMP);
  671. pref_skip_pubtmp:
  672. /* check HOME/COA conflicts */
  673. switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
  674. case IPV6_PREFER_SRC_HOME:
  675. break;
  676. case IPV6_PREFER_SRC_COA:
  677. pref |= IPV6_PREFER_SRC_COA;
  678. case 0:
  679. goto pref_skip_coa;
  680. default:
  681. goto e_inval;
  682. }
  683. prefmask &= ~IPV6_PREFER_SRC_COA;
  684. pref_skip_coa:
  685. /* check CGA/NONCGA conflicts */
  686. switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
  687. case IPV6_PREFER_SRC_CGA:
  688. case IPV6_PREFER_SRC_NONCGA:
  689. case 0:
  690. break;
  691. default:
  692. goto e_inval;
  693. }
  694. np->srcprefs = (np->srcprefs & prefmask) | pref;
  695. retv = 0;
  696. break;
  697. }
  698. case IPV6_MINHOPCOUNT:
  699. if (optlen < sizeof(int))
  700. goto e_inval;
  701. if (val < 0 || val > 255)
  702. goto e_inval;
  703. np->min_hopcount = val;
  704. break;
  705. case IPV6_DONTFRAG:
  706. np->dontfrag = valbool;
  707. retv = 0;
  708. break;
  709. }
  710. release_sock(sk);
  711. return retv;
  712. e_inval:
  713. release_sock(sk);
  714. return -EINVAL;
  715. }
  716. int ipv6_setsockopt(struct sock *sk, int level, int optname,
  717. char __user *optval, unsigned int optlen)
  718. {
  719. int err;
  720. if (level == SOL_IP && sk->sk_type != SOCK_RAW)
  721. return udp_prot.setsockopt(sk, level, optname, optval, optlen);
  722. if (level != SOL_IPV6)
  723. return -ENOPROTOOPT;
  724. err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
  725. #ifdef CONFIG_NETFILTER
  726. /* we need to exclude all possible ENOPROTOOPTs except default case */
  727. if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
  728. optname != IPV6_XFRM_POLICY) {
  729. lock_sock(sk);
  730. err = nf_setsockopt(sk, PF_INET6, optname, optval,
  731. optlen);
  732. release_sock(sk);
  733. }
  734. #endif
  735. return err;
  736. }
  737. EXPORT_SYMBOL(ipv6_setsockopt);
  738. #ifdef CONFIG_COMPAT
  739. int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
  740. char __user *optval, unsigned int optlen)
  741. {
  742. int err;
  743. if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
  744. if (udp_prot.compat_setsockopt != NULL)
  745. return udp_prot.compat_setsockopt(sk, level, optname,
  746. optval, optlen);
  747. return udp_prot.setsockopt(sk, level, optname, optval, optlen);
  748. }
  749. if (level != SOL_IPV6)
  750. return -ENOPROTOOPT;
  751. if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
  752. return compat_mc_setsockopt(sk, level, optname, optval, optlen,
  753. ipv6_setsockopt);
  754. err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
  755. #ifdef CONFIG_NETFILTER
  756. /* we need to exclude all possible ENOPROTOOPTs except default case */
  757. if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
  758. optname != IPV6_XFRM_POLICY) {
  759. lock_sock(sk);
  760. err = compat_nf_setsockopt(sk, PF_INET6, optname,
  761. optval, optlen);
  762. release_sock(sk);
  763. }
  764. #endif
  765. return err;
  766. }
  767. EXPORT_SYMBOL(compat_ipv6_setsockopt);
  768. #endif
  769. static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
  770. int optname, char __user *optval, int len)
  771. {
  772. struct ipv6_opt_hdr *hdr;
  773. if (!opt)
  774. return 0;
  775. switch(optname) {
  776. case IPV6_HOPOPTS:
  777. hdr = opt->hopopt;
  778. break;
  779. case IPV6_RTHDRDSTOPTS:
  780. hdr = opt->dst0opt;
  781. break;
  782. case IPV6_RTHDR:
  783. hdr = (struct ipv6_opt_hdr *)opt->srcrt;
  784. break;
  785. case IPV6_DSTOPTS:
  786. hdr = opt->dst1opt;
  787. break;
  788. default:
  789. return -EINVAL; /* should not happen */
  790. }
  791. if (!hdr)
  792. return 0;
  793. len = min_t(unsigned int, len, ipv6_optlen(hdr));
  794. if (copy_to_user(optval, hdr, len))
  795. return -EFAULT;
  796. return len;
  797. }
  798. static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
  799. char __user *optval, int __user *optlen)
  800. {
  801. struct ipv6_pinfo *np = inet6_sk(sk);
  802. int len;
  803. int val;
  804. if (ip6_mroute_opt(optname))
  805. return ip6_mroute_getsockopt(sk, optname, optval, optlen);
  806. if (get_user(len, optlen))
  807. return -EFAULT;
  808. switch (optname) {
  809. case IPV6_ADDRFORM:
  810. if (sk->sk_protocol != IPPROTO_UDP &&
  811. sk->sk_protocol != IPPROTO_UDPLITE &&
  812. sk->sk_protocol != IPPROTO_TCP)
  813. return -ENOPROTOOPT;
  814. if (sk->sk_state != TCP_ESTABLISHED)
  815. return -ENOTCONN;
  816. val = sk->sk_family;
  817. break;
  818. case MCAST_MSFILTER:
  819. {
  820. struct group_filter gsf;
  821. int err;
  822. if (len < GROUP_FILTER_SIZE(0))
  823. return -EINVAL;
  824. if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
  825. return -EFAULT;
  826. if (gsf.gf_group.ss_family != AF_INET6)
  827. return -EADDRNOTAVAIL;
  828. lock_sock(sk);
  829. err = ip6_mc_msfget(sk, &gsf,
  830. (struct group_filter __user *)optval, optlen);
  831. release_sock(sk);
  832. return err;
  833. }
  834. case IPV6_2292PKTOPTIONS:
  835. {
  836. struct msghdr msg;
  837. struct sk_buff *skb;
  838. if (sk->sk_type != SOCK_STREAM)
  839. return -ENOPROTOOPT;
  840. msg.msg_control = optval;
  841. msg.msg_controllen = len;
  842. msg.msg_flags = 0;
  843. lock_sock(sk);
  844. skb = np->pktoptions;
  845. if (skb)
  846. atomic_inc(&skb->users);
  847. release_sock(sk);
  848. if (skb) {
  849. int err = datagram_recv_ctl(sk, &msg, skb);
  850. kfree_skb(skb);
  851. if (err)
  852. return err;
  853. } else {
  854. if (np->rxopt.bits.rxinfo) {
  855. struct in6_pktinfo src_info;
  856. src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
  857. np->sticky_pktinfo.ipi6_ifindex;
  858. np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
  859. ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
  860. put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
  861. }
  862. if (np->rxopt.bits.rxhlim) {
  863. int hlim = np->mcast_hops;
  864. put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
  865. }
  866. if (np->rxopt.bits.rxoinfo) {
  867. struct in6_pktinfo src_info;
  868. src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
  869. np->sticky_pktinfo.ipi6_ifindex;
  870. np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
  871. ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
  872. put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
  873. }
  874. if (np->rxopt.bits.rxohlim) {
  875. int hlim = np->mcast_hops;
  876. put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
  877. }
  878. }
  879. len -= msg.msg_controllen;
  880. return put_user(len, optlen);
  881. }
  882. case IPV6_MTU:
  883. {
  884. struct dst_entry *dst;
  885. val = 0;
  886. rcu_read_lock();
  887. dst = __sk_dst_get(sk);
  888. if (dst)
  889. val = dst_mtu(dst);
  890. rcu_read_unlock();
  891. if (!val)
  892. return -ENOTCONN;
  893. break;
  894. }
  895. case IPV6_V6ONLY:
  896. val = np->ipv6only;
  897. break;
  898. case IPV6_RECVPKTINFO:
  899. val = np->rxopt.bits.rxinfo;
  900. break;
  901. case IPV6_2292PKTINFO:
  902. val = np->rxopt.bits.rxoinfo;
  903. break;
  904. case IPV6_RECVHOPLIMIT:
  905. val = np->rxopt.bits.rxhlim;
  906. break;
  907. case IPV6_2292HOPLIMIT:
  908. val = np->rxopt.bits.rxohlim;
  909. break;
  910. case IPV6_RECVRTHDR:
  911. val = np->rxopt.bits.srcrt;
  912. break;
  913. case IPV6_2292RTHDR:
  914. val = np->rxopt.bits.osrcrt;
  915. break;
  916. case IPV6_HOPOPTS:
  917. case IPV6_RTHDRDSTOPTS:
  918. case IPV6_RTHDR:
  919. case IPV6_DSTOPTS:
  920. {
  921. lock_sock(sk);
  922. len = ipv6_getsockopt_sticky(sk, np->opt,
  923. optname, optval, len);
  924. release_sock(sk);
  925. /* check if ipv6_getsockopt_sticky() returns err code */
  926. if (len < 0)
  927. return len;
  928. return put_user(len, optlen);
  929. }
  930. case IPV6_RECVHOPOPTS:
  931. val = np->rxopt.bits.hopopts;
  932. break;
  933. case IPV6_2292HOPOPTS:
  934. val = np->rxopt.bits.ohopopts;
  935. break;
  936. case IPV6_RECVDSTOPTS:
  937. val = np->rxopt.bits.dstopts;
  938. break;
  939. case IPV6_2292DSTOPTS:
  940. val = np->rxopt.bits.odstopts;
  941. break;
  942. case IPV6_TCLASS:
  943. val = np->tclass;
  944. break;
  945. case IPV6_RECVTCLASS:
  946. val = np->rxopt.bits.rxtclass;
  947. break;
  948. case IPV6_FLOWINFO:
  949. val = np->rxopt.bits.rxflow;
  950. break;
  951. case IPV6_RECVPATHMTU:
  952. val = np->rxopt.bits.rxpmtu;
  953. break;
  954. case IPV6_PATHMTU:
  955. {
  956. struct dst_entry *dst;
  957. struct ip6_mtuinfo mtuinfo;
  958. if (len < sizeof(mtuinfo))
  959. return -EINVAL;
  960. len = sizeof(mtuinfo);
  961. memset(&mtuinfo, 0, sizeof(mtuinfo));
  962. rcu_read_lock();
  963. dst = __sk_dst_get(sk);
  964. if (dst)
  965. mtuinfo.ip6m_mtu = dst_mtu(dst);
  966. rcu_read_unlock();
  967. if (!mtuinfo.ip6m_mtu)
  968. return -ENOTCONN;
  969. if (put_user(len, optlen))
  970. return -EFAULT;
  971. if (copy_to_user(optval, &mtuinfo, len))
  972. return -EFAULT;
  973. return 0;
  974. break;
  975. }
  976. case IPV6_TRANSPARENT:
  977. val = inet_sk(sk)->transparent;
  978. break;
  979. case IPV6_RECVORIGDSTADDR:
  980. val = np->rxopt.bits.rxorigdstaddr;
  981. break;
  982. case IPV6_UNICAST_HOPS:
  983. case IPV6_MULTICAST_HOPS:
  984. {
  985. struct dst_entry *dst;
  986. if (optname == IPV6_UNICAST_HOPS)
  987. val = np->hop_limit;
  988. else
  989. val = np->mcast_hops;
  990. if (val < 0) {
  991. rcu_read_lock();
  992. dst = __sk_dst_get(sk);
  993. if (dst)
  994. val = ip6_dst_hoplimit(dst);
  995. rcu_read_unlock();
  996. }
  997. if (val < 0)
  998. val = sock_net(sk)->ipv6.devconf_all->hop_limit;
  999. break;
  1000. }
  1001. case IPV6_MULTICAST_LOOP:
  1002. val = np->mc_loop;
  1003. break;
  1004. case IPV6_MULTICAST_IF:
  1005. val = np->mcast_oif;
  1006. break;
  1007. case IPV6_MTU_DISCOVER:
  1008. val = np->pmtudisc;
  1009. break;
  1010. case IPV6_RECVERR:
  1011. val = np->recverr;
  1012. break;
  1013. case IPV6_FLOWINFO_SEND:
  1014. val = np->sndflow;
  1015. break;
  1016. case IPV6_ADDR_PREFERENCES:
  1017. val = 0;
  1018. if (np->srcprefs & IPV6_PREFER_SRC_TMP)
  1019. val |= IPV6_PREFER_SRC_TMP;
  1020. else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
  1021. val |= IPV6_PREFER_SRC_PUBLIC;
  1022. else {
  1023. /* XXX: should we return system default? */
  1024. val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
  1025. }
  1026. if (np->srcprefs & IPV6_PREFER_SRC_COA)
  1027. val |= IPV6_PREFER_SRC_COA;
  1028. else
  1029. val |= IPV6_PREFER_SRC_HOME;
  1030. break;
  1031. case IPV6_MINHOPCOUNT:
  1032. val = np->min_hopcount;
  1033. break;
  1034. case IPV6_DONTFRAG:
  1035. val = np->dontfrag;
  1036. break;
  1037. default:
  1038. return -ENOPROTOOPT;
  1039. }
  1040. len = min_t(unsigned int, sizeof(int), len);
  1041. if(put_user(len, optlen))
  1042. return -EFAULT;
  1043. if(copy_to_user(optval,&val,len))
  1044. return -EFAULT;
  1045. return 0;
  1046. }
  1047. int ipv6_getsockopt(struct sock *sk, int level, int optname,
  1048. char __user *optval, int __user *optlen)
  1049. {
  1050. int err;
  1051. if (level == SOL_IP && sk->sk_type != SOCK_RAW)
  1052. return udp_prot.getsockopt(sk, level, optname, optval, optlen);
  1053. if(level != SOL_IPV6)
  1054. return -ENOPROTOOPT;
  1055. err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
  1056. #ifdef CONFIG_NETFILTER
  1057. /* we need to exclude all possible ENOPROTOOPTs except default case */
  1058. if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
  1059. int len;
  1060. if (get_user(len, optlen))
  1061. return -EFAULT;
  1062. lock_sock(sk);
  1063. err = nf_getsockopt(sk, PF_INET6, optname, optval,
  1064. &len);
  1065. release_sock(sk);
  1066. if (err >= 0)
  1067. err = put_user(len, optlen);
  1068. }
  1069. #endif
  1070. return err;
  1071. }
  1072. EXPORT_SYMBOL(ipv6_getsockopt);
  1073. #ifdef CONFIG_COMPAT
  1074. int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
  1075. char __user *optval, int __user *optlen)
  1076. {
  1077. int err;
  1078. if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
  1079. if (udp_prot.compat_getsockopt != NULL)
  1080. return udp_prot.compat_getsockopt(sk, level, optname,
  1081. optval, optlen);
  1082. return udp_prot.getsockopt(sk, level, optname, optval, optlen);
  1083. }
  1084. if (level != SOL_IPV6)
  1085. return -ENOPROTOOPT;
  1086. if (optname == MCAST_MSFILTER)
  1087. return compat_mc_getsockopt(sk, level, optname, optval, optlen,
  1088. ipv6_getsockopt);
  1089. err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
  1090. #ifdef CONFIG_NETFILTER
  1091. /* we need to exclude all possible ENOPROTOOPTs except default case */
  1092. if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
  1093. int len;
  1094. if (get_user(len, optlen))
  1095. return -EFAULT;
  1096. lock_sock(sk);
  1097. err = compat_nf_getsockopt(sk, PF_INET6,
  1098. optname, optval, &len);
  1099. release_sock(sk);
  1100. if (err >= 0)
  1101. err = put_user(len, optlen);
  1102. }
  1103. #endif
  1104. return err;
  1105. }
  1106. EXPORT_SYMBOL(compat_ipv6_getsockopt);
  1107. #endif