ipv6_sockglue.c 23 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. * $Id: ipv6_sockglue.c,v 1.1.1.1 2007/06/12 07:27:14 eyryu Exp $
  11. *
  12. * This program is free software; you can redistribute it and/or
  13. * modify it under the terms of the GNU General Public License
  14. * as published by the Free Software Foundation; either version
  15. * 2 of the License, or (at your option) any later version.
  16. *
  17. * FIXME: Make the setsockopt code POSIX compliant: That is
  18. *
  19. * o Return -EINVAL for setsockopt of short lengths
  20. * o Truncate getsockopt returns
  21. * o Return an optlen of the truncated length if need be
  22. *
  23. * Changes:
  24. * David L Stevens <dlstevens@us.ibm.com>:
  25. * - added multicast source filtering API for MLDv2
  26. */
  27. #include <linux/module.h>
  28. #include <linux/capability.h>
  29. #include <linux/errno.h>
  30. #include <linux/types.h>
  31. #include <linux/socket.h>
  32. #include <linux/sockios.h>
  33. #include <linux/net.h>
  34. #include <linux/in6.h>
  35. #include <linux/netdevice.h>
  36. #include <linux/if_arp.h>
  37. #include <linux/init.h>
  38. #include <linux/sysctl.h>
  39. #include <linux/netfilter.h>
  40. #include <net/sock.h>
  41. #include <net/snmp.h>
  42. #include <net/ipv6.h>
  43. #include <net/ndisc.h>
  44. #include <net/protocol.h>
  45. #include <net/transp_v6.h>
  46. #include <net/ip6_route.h>
  47. #include <net/addrconf.h>
  48. #include <net/inet_common.h>
  49. #include <net/tcp.h>
  50. #include <net/udp.h>
  51. #include <net/udplite.h>
  52. #include <net/xfrm.h>
  53. #include <asm/uaccess.h>
  54. DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
  55. static struct inet6_protocol *ipv6_gso_pull_exthdrs(struct sk_buff *skb,
  56. int proto)
  57. {
  58. struct inet6_protocol *ops = NULL;
  59. for (;;) {
  60. struct ipv6_opt_hdr *opth;
  61. int len;
  62. if (proto != NEXTHDR_HOP) {
  63. ops = rcu_dereference(inet6_protos[proto]);
  64. if (unlikely(!ops))
  65. break;
  66. if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
  67. break;
  68. }
  69. if (unlikely(!pskb_may_pull(skb, 8)))
  70. break;
  71. opth = (void *)skb->data;
  72. len = opth->hdrlen * 8 + 8;
  73. if (unlikely(!pskb_may_pull(skb, len)))
  74. break;
  75. proto = opth->nexthdr;
  76. __skb_pull(skb, len);
  77. }
  78. return ops;
  79. }
  80. static int ipv6_gso_send_check(struct sk_buff *skb)
  81. {
  82. struct ipv6hdr *ipv6h;
  83. struct inet6_protocol *ops;
  84. int err = -EINVAL;
  85. if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
  86. goto out;
  87. ipv6h = skb->nh.ipv6h;
  88. __skb_pull(skb, sizeof(*ipv6h));
  89. err = -EPROTONOSUPPORT;
  90. rcu_read_lock();
  91. ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
  92. if (likely(ops && ops->gso_send_check)) {
  93. skb->h.raw = skb->data;
  94. err = ops->gso_send_check(skb);
  95. }
  96. rcu_read_unlock();
  97. out:
  98. return err;
  99. }
  100. static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
  101. {
  102. struct sk_buff *segs = ERR_PTR(-EINVAL);
  103. struct ipv6hdr *ipv6h;
  104. struct inet6_protocol *ops;
  105. if (!(features & NETIF_F_HW_CSUM))
  106. features &= ~NETIF_F_SG;
  107. if (unlikely(skb_shinfo(skb)->gso_type &
  108. ~(SKB_GSO_UDP |
  109. SKB_GSO_DODGY |
  110. SKB_GSO_TCP_ECN |
  111. SKB_GSO_TCPV6 |
  112. 0)))
  113. goto out;
  114. if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
  115. goto out;
  116. ipv6h = skb->nh.ipv6h;
  117. __skb_pull(skb, sizeof(*ipv6h));
  118. segs = ERR_PTR(-EPROTONOSUPPORT);
  119. rcu_read_lock();
  120. ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
  121. if (likely(ops && ops->gso_segment)) {
  122. skb->h.raw = skb->data;
  123. segs = ops->gso_segment(skb, features);
  124. }
  125. rcu_read_unlock();
  126. if (unlikely(IS_ERR(segs)))
  127. goto out;
  128. for (skb = segs; skb; skb = skb->next) {
  129. ipv6h = skb->nh.ipv6h;
  130. ipv6h->payload_len = htons(skb->len - skb->mac_len -
  131. sizeof(*ipv6h));
  132. }
  133. out:
  134. return segs;
  135. }
  136. static struct packet_type ipv6_packet_type = {
  137. .type = __constant_htons(ETH_P_IPV6),
  138. .func = ipv6_rcv,
  139. .gso_send_check = ipv6_gso_send_check,
  140. .gso_segment = ipv6_gso_segment,
  141. };
  142. struct ip6_ra_chain *ip6_ra_chain;
  143. DEFINE_RWLOCK(ip6_ra_lock);
  144. int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
  145. {
  146. struct ip6_ra_chain *ra, *new_ra, **rap;
  147. /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  148. if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
  149. return -EINVAL;
  150. new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  151. write_lock_bh(&ip6_ra_lock);
  152. for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
  153. if (ra->sk == sk) {
  154. if (sel>=0) {
  155. write_unlock_bh(&ip6_ra_lock);
  156. kfree(new_ra);
  157. return -EADDRINUSE;
  158. }
  159. *rap = ra->next;
  160. write_unlock_bh(&ip6_ra_lock);
  161. if (ra->destructor)
  162. ra->destructor(sk);
  163. sock_put(sk);
  164. kfree(ra);
  165. return 0;
  166. }
  167. }
  168. if (new_ra == NULL) {
  169. write_unlock_bh(&ip6_ra_lock);
  170. return -ENOBUFS;
  171. }
  172. new_ra->sk = sk;
  173. new_ra->sel = sel;
  174. new_ra->destructor = destructor;
  175. new_ra->next = ra;
  176. *rap = new_ra;
  177. sock_hold(sk);
  178. write_unlock_bh(&ip6_ra_lock);
  179. return 0;
  180. }
  181. static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
  182. char __user *optval, int optlen)
  183. {
  184. struct ipv6_pinfo *np = inet6_sk(sk);
  185. int val, valbool;
  186. int retv = -ENOPROTOOPT;
  187. if (optval == NULL)
  188. val=0;
  189. else if (get_user(val, (int __user *) optval))
  190. return -EFAULT;
  191. valbool = (val!=0);
  192. lock_sock(sk);
  193. switch (optname) {
  194. case IPV6_ADDRFORM:
  195. if (val == PF_INET) {
  196. struct ipv6_txoptions *opt;
  197. struct sk_buff *pktopt;
  198. if (sk->sk_protocol != IPPROTO_UDP &&
  199. sk->sk_protocol != IPPROTO_UDPLITE &&
  200. sk->sk_protocol != IPPROTO_TCP)
  201. break;
  202. if (sk->sk_state != TCP_ESTABLISHED) {
  203. retv = -ENOTCONN;
  204. break;
  205. }
  206. if (ipv6_only_sock(sk) ||
  207. !(ipv6_addr_type(&np->daddr) & IPV6_ADDR_MAPPED)) {
  208. retv = -EADDRNOTAVAIL;
  209. break;
  210. }
  211. fl6_free_socklist(sk);
  212. ipv6_sock_mc_close(sk);
  213. /*
  214. * Sock is moving from IPv6 to IPv4 (sk_prot), so
  215. * remove it from the refcnt debug socks count in the
  216. * original family...
  217. */
  218. sk_refcnt_debug_dec(sk);
  219. if (sk->sk_protocol == IPPROTO_TCP) {
  220. struct inet_connection_sock *icsk = inet_csk(sk);
  221. local_bh_disable();
  222. sock_prot_dec_use(sk->sk_prot);
  223. sock_prot_inc_use(&tcp_prot);
  224. local_bh_enable();
  225. sk->sk_prot = &tcp_prot;
  226. icsk->icsk_af_ops = &ipv4_specific;
  227. sk->sk_socket->ops = &inet_stream_ops;
  228. sk->sk_family = PF_INET;
  229. tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
  230. } else {
  231. struct proto *prot = &udp_prot;
  232. if (sk->sk_protocol == IPPROTO_UDPLITE)
  233. prot = &udplite_prot;
  234. local_bh_disable();
  235. sock_prot_dec_use(sk->sk_prot);
  236. sock_prot_inc_use(prot);
  237. local_bh_enable();
  238. sk->sk_prot = prot;
  239. sk->sk_socket->ops = &inet_dgram_ops;
  240. sk->sk_family = PF_INET;
  241. }
  242. opt = xchg(&np->opt, NULL);
  243. if (opt)
  244. sock_kfree_s(sk, opt, opt->tot_len);
  245. pktopt = xchg(&np->pktoptions, NULL);
  246. if (pktopt)
  247. kfree_skb(pktopt);
  248. sk->sk_destruct = inet_sock_destruct;
  249. /*
  250. * ... and add it to the refcnt debug socks count
  251. * in the new family. -acme
  252. */
  253. sk_refcnt_debug_inc(sk);
  254. module_put(THIS_MODULE);
  255. retv = 0;
  256. break;
  257. }
  258. goto e_inval;
  259. case IPV6_V6ONLY:
  260. if (inet_sk(sk)->num)
  261. goto e_inval;
  262. np->ipv6only = valbool;
  263. retv = 0;
  264. break;
  265. case IPV6_RECVPKTINFO:
  266. np->rxopt.bits.rxinfo = valbool;
  267. retv = 0;
  268. break;
  269. case IPV6_2292PKTINFO:
  270. np->rxopt.bits.rxoinfo = valbool;
  271. retv = 0;
  272. break;
  273. case IPV6_RECVHOPLIMIT:
  274. np->rxopt.bits.rxhlim = valbool;
  275. retv = 0;
  276. break;
  277. case IPV6_2292HOPLIMIT:
  278. np->rxopt.bits.rxohlim = valbool;
  279. retv = 0;
  280. break;
  281. case IPV6_RECVRTHDR:
  282. if (val < 0 || val > 2)
  283. goto e_inval;
  284. np->rxopt.bits.srcrt = val;
  285. retv = 0;
  286. break;
  287. case IPV6_2292RTHDR:
  288. if (val < 0 || val > 2)
  289. goto e_inval;
  290. np->rxopt.bits.osrcrt = val;
  291. retv = 0;
  292. break;
  293. case IPV6_RECVHOPOPTS:
  294. np->rxopt.bits.hopopts = valbool;
  295. retv = 0;
  296. break;
  297. case IPV6_2292HOPOPTS:
  298. np->rxopt.bits.ohopopts = valbool;
  299. retv = 0;
  300. break;
  301. case IPV6_RECVDSTOPTS:
  302. np->rxopt.bits.dstopts = valbool;
  303. retv = 0;
  304. break;
  305. case IPV6_2292DSTOPTS:
  306. np->rxopt.bits.odstopts = valbool;
  307. retv = 0;
  308. break;
  309. case IPV6_TCLASS:
  310. if (val < -1 || val > 0xff)
  311. goto e_inval;
  312. np->tclass = val;
  313. retv = 0;
  314. break;
  315. case IPV6_RECVTCLASS:
  316. np->rxopt.bits.rxtclass = valbool;
  317. retv = 0;
  318. break;
  319. case IPV6_FLOWINFO:
  320. np->rxopt.bits.rxflow = valbool;
  321. retv = 0;
  322. break;
  323. case IPV6_HOPOPTS:
  324. case IPV6_RTHDRDSTOPTS:
  325. case IPV6_RTHDR:
  326. case IPV6_DSTOPTS:
  327. {
  328. struct ipv6_txoptions *opt;
  329. if (optlen == 0)
  330. optval = NULL;
  331. /* hop-by-hop / destination options are privileged option */
  332. retv = -EPERM;
  333. if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
  334. break;
  335. retv = -EINVAL;
  336. if (optlen & 0x7 || optlen > 8 * 255)
  337. break;
  338. opt = ipv6_renew_options(sk, np->opt, optname,
  339. (struct ipv6_opt_hdr __user *)optval,
  340. optlen);
  341. if (IS_ERR(opt)) {
  342. retv = PTR_ERR(opt);
  343. break;
  344. }
  345. /* routing header option needs extra check */
  346. if (optname == IPV6_RTHDR && opt && opt->srcrt) {
  347. struct ipv6_rt_hdr *rthdr = opt->srcrt;
  348. switch (rthdr->type) {
  349. case IPV6_SRCRT_TYPE_0:
  350. #ifdef CONFIG_IPV6_MIP6
  351. case IPV6_SRCRT_TYPE_2:
  352. #endif
  353. break;
  354. default:
  355. goto sticky_done;
  356. }
  357. if ((rthdr->hdrlen & 1) ||
  358. (rthdr->hdrlen >> 1) != rthdr->segments_left)
  359. goto sticky_done;
  360. }
  361. retv = 0;
  362. if (inet_sk(sk)->is_icsk) {
  363. if (opt) {
  364. struct inet_connection_sock *icsk = inet_csk(sk);
  365. if (!((1 << sk->sk_state) &
  366. (TCPF_LISTEN | TCPF_CLOSE))
  367. && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
  368. icsk->icsk_ext_hdr_len =
  369. opt->opt_flen + opt->opt_nflen;
  370. icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
  371. }
  372. }
  373. opt = xchg(&np->opt, opt);
  374. sk_dst_reset(sk);
  375. } else {
  376. write_lock(&sk->sk_dst_lock);
  377. opt = xchg(&np->opt, opt);
  378. write_unlock(&sk->sk_dst_lock);
  379. sk_dst_reset(sk);
  380. }
  381. sticky_done:
  382. if (opt)
  383. sock_kfree_s(sk, opt, opt->tot_len);
  384. break;
  385. }
  386. case IPV6_2292PKTOPTIONS:
  387. {
  388. struct ipv6_txoptions *opt = NULL;
  389. struct msghdr msg;
  390. struct flowi fl;
  391. int junk;
  392. fl.fl6_flowlabel = 0;
  393. fl.oif = sk->sk_bound_dev_if;
  394. if (optlen == 0)
  395. goto update;
  396. /* 1K is probably excessive
  397. * 1K is surely not enough, 2K per standard header is 16K.
  398. */
  399. retv = -EINVAL;
  400. if (optlen > 64*1024)
  401. break;
  402. opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
  403. retv = -ENOBUFS;
  404. if (opt == NULL)
  405. break;
  406. memset(opt, 0, sizeof(*opt));
  407. opt->tot_len = sizeof(*opt) + optlen;
  408. retv = -EFAULT;
  409. if (copy_from_user(opt+1, optval, optlen))
  410. goto done;
  411. msg.msg_controllen = optlen;
  412. msg.msg_control = (void*)(opt+1);
  413. retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
  414. if (retv)
  415. goto done;
  416. update:
  417. retv = 0;
  418. if (inet_sk(sk)->is_icsk) {
  419. if (opt) {
  420. struct inet_connection_sock *icsk = inet_csk(sk);
  421. if (!((1 << sk->sk_state) &
  422. (TCPF_LISTEN | TCPF_CLOSE))
  423. && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
  424. icsk->icsk_ext_hdr_len =
  425. opt->opt_flen + opt->opt_nflen;
  426. icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
  427. }
  428. }
  429. opt = xchg(&np->opt, opt);
  430. sk_dst_reset(sk);
  431. } else {
  432. write_lock(&sk->sk_dst_lock);
  433. opt = xchg(&np->opt, opt);
  434. write_unlock(&sk->sk_dst_lock);
  435. sk_dst_reset(sk);
  436. }
  437. done:
  438. if (opt)
  439. sock_kfree_s(sk, opt, opt->tot_len);
  440. break;
  441. }
  442. case IPV6_UNICAST_HOPS:
  443. if (val > 255 || val < -1)
  444. goto e_inval;
  445. np->hop_limit = val;
  446. retv = 0;
  447. break;
  448. case IPV6_MULTICAST_HOPS:
  449. if (sk->sk_type == SOCK_STREAM)
  450. goto e_inval;
  451. if (val > 255 || val < -1)
  452. goto e_inval;
  453. np->mcast_hops = val;
  454. retv = 0;
  455. break;
  456. case IPV6_MULTICAST_LOOP:
  457. np->mc_loop = valbool;
  458. retv = 0;
  459. break;
  460. case IPV6_MULTICAST_IF:
  461. if (sk->sk_type == SOCK_STREAM)
  462. goto e_inval;
  463. if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
  464. goto e_inval;
  465. if (__dev_get_by_index(val) == NULL) {
  466. retv = -ENODEV;
  467. break;
  468. }
  469. np->mcast_oif = val;
  470. retv = 0;
  471. break;
  472. case IPV6_ADD_MEMBERSHIP:
  473. case IPV6_DROP_MEMBERSHIP:
  474. {
  475. struct ipv6_mreq mreq;
  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. retv = -EFAULT;
  506. if (copy_from_user(&greq, optval, sizeof(struct group_req)))
  507. break;
  508. if (greq.gr_group.ss_family != AF_INET6) {
  509. retv = -EADDRNOTAVAIL;
  510. break;
  511. }
  512. psin6 = (struct sockaddr_in6 *)&greq.gr_group;
  513. if (optname == MCAST_JOIN_GROUP)
  514. retv = ipv6_sock_mc_join(sk, greq.gr_interface,
  515. &psin6->sin6_addr);
  516. else
  517. retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
  518. &psin6->sin6_addr);
  519. break;
  520. }
  521. case MCAST_JOIN_SOURCE_GROUP:
  522. case MCAST_LEAVE_SOURCE_GROUP:
  523. case MCAST_BLOCK_SOURCE:
  524. case MCAST_UNBLOCK_SOURCE:
  525. {
  526. struct group_source_req greqs;
  527. int omode, add;
  528. if (optlen != sizeof(struct group_source_req))
  529. goto e_inval;
  530. if (copy_from_user(&greqs, optval, sizeof(greqs))) {
  531. retv = -EFAULT;
  532. break;
  533. }
  534. if (greqs.gsr_group.ss_family != AF_INET6 ||
  535. greqs.gsr_source.ss_family != AF_INET6) {
  536. retv = -EADDRNOTAVAIL;
  537. break;
  538. }
  539. if (optname == MCAST_BLOCK_SOURCE) {
  540. omode = MCAST_EXCLUDE;
  541. add = 1;
  542. } else if (optname == MCAST_UNBLOCK_SOURCE) {
  543. omode = MCAST_EXCLUDE;
  544. add = 0;
  545. } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
  546. struct sockaddr_in6 *psin6;
  547. psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
  548. retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
  549. &psin6->sin6_addr);
  550. /* prior join w/ different source is ok */
  551. if (retv && retv != -EADDRINUSE)
  552. break;
  553. omode = MCAST_INCLUDE;
  554. add = 1;
  555. } else /* MCAST_LEAVE_SOURCE_GROUP */ {
  556. omode = MCAST_INCLUDE;
  557. add = 0;
  558. }
  559. retv = ip6_mc_source(add, omode, sk, &greqs);
  560. break;
  561. }
  562. case MCAST_MSFILTER:
  563. {
  564. extern int sysctl_mld_max_msf;
  565. struct group_filter *gsf;
  566. if (optlen < GROUP_FILTER_SIZE(0))
  567. goto e_inval;
  568. if (optlen > sysctl_optmem_max) {
  569. retv = -ENOBUFS;
  570. break;
  571. }
  572. gsf = kmalloc(optlen,GFP_KERNEL);
  573. if (gsf == 0) {
  574. retv = -ENOBUFS;
  575. break;
  576. }
  577. retv = -EFAULT;
  578. if (copy_from_user(gsf, optval, optlen)) {
  579. kfree(gsf);
  580. break;
  581. }
  582. /* numsrc >= (4G-140)/128 overflow in 32 bits */
  583. if (gsf->gf_numsrc >= 0x1ffffffU ||
  584. gsf->gf_numsrc > sysctl_mld_max_msf) {
  585. kfree(gsf);
  586. retv = -ENOBUFS;
  587. break;
  588. }
  589. if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
  590. kfree(gsf);
  591. retv = -EINVAL;
  592. break;
  593. }
  594. retv = ip6_mc_msfilter(sk, gsf);
  595. kfree(gsf);
  596. break;
  597. }
  598. case IPV6_ROUTER_ALERT:
  599. retv = ip6_ra_control(sk, val, NULL);
  600. break;
  601. case IPV6_MTU_DISCOVER:
  602. if (val<0 || val>2)
  603. goto e_inval;
  604. np->pmtudisc = val;
  605. retv = 0;
  606. break;
  607. case IPV6_MTU:
  608. if (val && val < IPV6_MIN_MTU)
  609. goto e_inval;
  610. np->frag_size = val;
  611. retv = 0;
  612. break;
  613. case IPV6_RECVERR:
  614. np->recverr = valbool;
  615. if (!val)
  616. skb_queue_purge(&sk->sk_error_queue);
  617. retv = 0;
  618. break;
  619. case IPV6_FLOWINFO_SEND:
  620. np->sndflow = valbool;
  621. retv = 0;
  622. break;
  623. case IPV6_FLOWLABEL_MGR:
  624. retv = ipv6_flowlabel_opt(sk, optval, optlen);
  625. break;
  626. case IPV6_IPSEC_POLICY:
  627. case IPV6_XFRM_POLICY:
  628. retv = -EPERM;
  629. if (!capable(CAP_NET_ADMIN))
  630. break;
  631. retv = xfrm_user_policy(sk, optname, optval, optlen);
  632. break;
  633. }
  634. release_sock(sk);
  635. return retv;
  636. e_inval:
  637. release_sock(sk);
  638. return -EINVAL;
  639. }
  640. int ipv6_setsockopt(struct sock *sk, int level, int optname,
  641. char __user *optval, int optlen)
  642. {
  643. int err;
  644. if (level == SOL_IP && sk->sk_type != SOCK_RAW)
  645. return udp_prot.setsockopt(sk, level, optname, optval, optlen);
  646. if (level != SOL_IPV6)
  647. return -ENOPROTOOPT;
  648. err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
  649. #ifdef CONFIG_NETFILTER
  650. /* we need to exclude all possible ENOPROTOOPTs except default case */
  651. if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
  652. optname != IPV6_XFRM_POLICY) {
  653. lock_sock(sk);
  654. err = nf_setsockopt(sk, PF_INET6, optname, optval,
  655. optlen);
  656. release_sock(sk);
  657. }
  658. #endif
  659. return err;
  660. }
  661. #ifdef CONFIG_COMPAT
  662. int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
  663. char __user *optval, int optlen)
  664. {
  665. int err;
  666. if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
  667. if (udp_prot.compat_setsockopt != NULL)
  668. return udp_prot.compat_setsockopt(sk, level, optname,
  669. optval, optlen);
  670. return udp_prot.setsockopt(sk, level, optname, optval, optlen);
  671. }
  672. if (level != SOL_IPV6)
  673. return -ENOPROTOOPT;
  674. err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
  675. #ifdef CONFIG_NETFILTER
  676. /* we need to exclude all possible ENOPROTOOPTs except default case */
  677. if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
  678. optname != IPV6_XFRM_POLICY) {
  679. lock_sock(sk);
  680. err = compat_nf_setsockopt(sk, PF_INET6, optname,
  681. optval, optlen);
  682. release_sock(sk);
  683. }
  684. #endif
  685. return err;
  686. }
  687. EXPORT_SYMBOL(compat_ipv6_setsockopt);
  688. #endif
  689. static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
  690. char __user *optval, int len)
  691. {
  692. struct ipv6_opt_hdr *hdr;
  693. if (!opt || !opt->hopopt)
  694. return 0;
  695. hdr = opt->hopopt;
  696. len = min_t(unsigned int, len, ipv6_optlen(hdr));
  697. if (copy_to_user(optval, hdr, ipv6_optlen(hdr)))
  698. return -EFAULT;
  699. return len;
  700. }
  701. static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
  702. char __user *optval, int __user *optlen)
  703. {
  704. struct ipv6_pinfo *np = inet6_sk(sk);
  705. int len;
  706. int val;
  707. if (get_user(len, optlen))
  708. return -EFAULT;
  709. switch (optname) {
  710. case IPV6_ADDRFORM:
  711. if (sk->sk_protocol != IPPROTO_UDP &&
  712. sk->sk_protocol != IPPROTO_UDPLITE &&
  713. sk->sk_protocol != IPPROTO_TCP)
  714. return -EINVAL;
  715. if (sk->sk_state != TCP_ESTABLISHED)
  716. return -ENOTCONN;
  717. val = sk->sk_family;
  718. break;
  719. case MCAST_MSFILTER:
  720. {
  721. struct group_filter gsf;
  722. int err;
  723. if (len < GROUP_FILTER_SIZE(0))
  724. return -EINVAL;
  725. if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
  726. return -EFAULT;
  727. lock_sock(sk);
  728. err = ip6_mc_msfget(sk, &gsf,
  729. (struct group_filter __user *)optval, optlen);
  730. release_sock(sk);
  731. return err;
  732. }
  733. case IPV6_2292PKTOPTIONS:
  734. {
  735. struct msghdr msg;
  736. struct sk_buff *skb;
  737. if (sk->sk_type != SOCK_STREAM)
  738. return -ENOPROTOOPT;
  739. msg.msg_control = optval;
  740. msg.msg_controllen = len;
  741. msg.msg_flags = 0;
  742. lock_sock(sk);
  743. skb = np->pktoptions;
  744. if (skb)
  745. atomic_inc(&skb->users);
  746. release_sock(sk);
  747. if (skb) {
  748. int err = datagram_recv_ctl(sk, &msg, skb);
  749. kfree_skb(skb);
  750. if (err)
  751. return err;
  752. } else {
  753. if (np->rxopt.bits.rxinfo) {
  754. struct in6_pktinfo src_info;
  755. src_info.ipi6_ifindex = np->mcast_oif;
  756. ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
  757. put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
  758. }
  759. if (np->rxopt.bits.rxhlim) {
  760. int hlim = np->mcast_hops;
  761. put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
  762. }
  763. if (np->rxopt.bits.rxoinfo) {
  764. struct in6_pktinfo src_info;
  765. src_info.ipi6_ifindex = np->mcast_oif;
  766. ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
  767. put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
  768. }
  769. if (np->rxopt.bits.rxohlim) {
  770. int hlim = np->mcast_hops;
  771. put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
  772. }
  773. }
  774. len -= msg.msg_controllen;
  775. return put_user(len, optlen);
  776. }
  777. case IPV6_MTU:
  778. {
  779. struct dst_entry *dst;
  780. val = 0;
  781. lock_sock(sk);
  782. dst = sk_dst_get(sk);
  783. if (dst) {
  784. val = dst_mtu(dst);
  785. dst_release(dst);
  786. }
  787. release_sock(sk);
  788. if (!val)
  789. return -ENOTCONN;
  790. break;
  791. }
  792. case IPV6_V6ONLY:
  793. val = np->ipv6only;
  794. break;
  795. case IPV6_RECVPKTINFO:
  796. val = np->rxopt.bits.rxinfo;
  797. break;
  798. case IPV6_2292PKTINFO:
  799. val = np->rxopt.bits.rxoinfo;
  800. break;
  801. case IPV6_RECVHOPLIMIT:
  802. val = np->rxopt.bits.rxhlim;
  803. break;
  804. case IPV6_2292HOPLIMIT:
  805. val = np->rxopt.bits.rxohlim;
  806. break;
  807. case IPV6_RECVRTHDR:
  808. val = np->rxopt.bits.srcrt;
  809. break;
  810. case IPV6_2292RTHDR:
  811. val = np->rxopt.bits.osrcrt;
  812. break;
  813. case IPV6_HOPOPTS:
  814. case IPV6_RTHDRDSTOPTS:
  815. case IPV6_RTHDR:
  816. case IPV6_DSTOPTS:
  817. {
  818. lock_sock(sk);
  819. len = ipv6_getsockopt_sticky(sk, np->opt,
  820. optval, len);
  821. release_sock(sk);
  822. return put_user(len, optlen);
  823. }
  824. case IPV6_RECVHOPOPTS:
  825. val = np->rxopt.bits.hopopts;
  826. break;
  827. case IPV6_2292HOPOPTS:
  828. val = np->rxopt.bits.ohopopts;
  829. break;
  830. case IPV6_RECVDSTOPTS:
  831. val = np->rxopt.bits.dstopts;
  832. break;
  833. case IPV6_2292DSTOPTS:
  834. val = np->rxopt.bits.odstopts;
  835. break;
  836. case IPV6_TCLASS:
  837. val = np->tclass;
  838. if (val < 0)
  839. val = 0;
  840. break;
  841. case IPV6_RECVTCLASS:
  842. val = np->rxopt.bits.rxtclass;
  843. break;
  844. case IPV6_FLOWINFO:
  845. val = np->rxopt.bits.rxflow;
  846. break;
  847. case IPV6_UNICAST_HOPS:
  848. case IPV6_MULTICAST_HOPS:
  849. {
  850. struct dst_entry *dst;
  851. if (optname == IPV6_UNICAST_HOPS)
  852. val = np->hop_limit;
  853. else
  854. val = np->mcast_hops;
  855. dst = sk_dst_get(sk);
  856. if (dst) {
  857. if (val < 0)
  858. val = dst_metric(dst, RTAX_HOPLIMIT);
  859. if (val < 0)
  860. val = ipv6_get_hoplimit(dst->dev);
  861. dst_release(dst);
  862. }
  863. if (val < 0)
  864. val = ipv6_devconf.hop_limit;
  865. break;
  866. }
  867. case IPV6_MULTICAST_LOOP:
  868. val = np->mc_loop;
  869. break;
  870. case IPV6_MULTICAST_IF:
  871. val = np->mcast_oif;
  872. break;
  873. case IPV6_MTU_DISCOVER:
  874. val = np->pmtudisc;
  875. break;
  876. case IPV6_RECVERR:
  877. val = np->recverr;
  878. break;
  879. case IPV6_FLOWINFO_SEND:
  880. val = np->sndflow;
  881. break;
  882. default:
  883. return -EINVAL;
  884. }
  885. len = min_t(unsigned int, sizeof(int), len);
  886. if(put_user(len, optlen))
  887. return -EFAULT;
  888. if(copy_to_user(optval,&val,len))
  889. return -EFAULT;
  890. return 0;
  891. }
  892. int ipv6_getsockopt(struct sock *sk, int level, int optname,
  893. char __user *optval, int __user *optlen)
  894. {
  895. int err;
  896. if (level == SOL_IP && sk->sk_type != SOCK_RAW)
  897. return udp_prot.getsockopt(sk, level, optname, optval, optlen);
  898. if(level != SOL_IPV6)
  899. return -ENOPROTOOPT;
  900. err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
  901. #ifdef CONFIG_NETFILTER
  902. /* we need to exclude all possible EINVALs except default case */
  903. if (err == -EINVAL && optname != IPV6_ADDRFORM &&
  904. optname != MCAST_MSFILTER) {
  905. int len;
  906. if (get_user(len, optlen))
  907. return -EFAULT;
  908. lock_sock(sk);
  909. err = nf_getsockopt(sk, PF_INET6, optname, optval,
  910. &len);
  911. release_sock(sk);
  912. if (err >= 0)
  913. err = put_user(len, optlen);
  914. }
  915. #endif
  916. return err;
  917. }
  918. #ifdef CONFIG_COMPAT
  919. int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
  920. char __user *optval, int __user *optlen)
  921. {
  922. int err;
  923. if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
  924. if (udp_prot.compat_getsockopt != NULL)
  925. return udp_prot.compat_getsockopt(sk, level, optname,
  926. optval, optlen);
  927. return udp_prot.getsockopt(sk, level, optname, optval, optlen);
  928. }
  929. if (level != SOL_IPV6)
  930. return -ENOPROTOOPT;
  931. err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
  932. #ifdef CONFIG_NETFILTER
  933. /* we need to exclude all possible EINVALs except default case */
  934. if (err == -EINVAL && optname != IPV6_ADDRFORM &&
  935. optname != MCAST_MSFILTER) {
  936. int len;
  937. if (get_user(len, optlen))
  938. return -EFAULT;
  939. lock_sock(sk);
  940. err = compat_nf_getsockopt(sk, PF_INET6,
  941. optname, optval, &len);
  942. release_sock(sk);
  943. if (err >= 0)
  944. err = put_user(len, optlen);
  945. }
  946. #endif
  947. return err;
  948. }
  949. EXPORT_SYMBOL(compat_ipv6_getsockopt);
  950. #endif
  951. void __init ipv6_packet_init(void)
  952. {
  953. dev_add_pack(&ipv6_packet_type);
  954. }
  955. void ipv6_packet_cleanup(void)
  956. {
  957. dev_remove_pack(&ipv6_packet_type);
  958. }