datagram.c 17 KB

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  1. /*
  2. * common UDP/RAW code
  3. * Linux INET6 implementation
  4. *
  5. * Authors:
  6. * Pedro Roque <roque@di.fc.ul.pt>
  7. *
  8. * $Id: datagram.c,v 1.1.1.1 2007/06/12 07:27:14 eyryu Exp $
  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. #include <linux/capability.h>
  16. #include <linux/errno.h>
  17. #include <linux/types.h>
  18. #include <linux/kernel.h>
  19. #include <linux/interrupt.h>
  20. #include <linux/socket.h>
  21. #include <linux/sockios.h>
  22. #include <linux/in6.h>
  23. #include <linux/ipv6.h>
  24. #include <linux/route.h>
  25. #include <net/ipv6.h>
  26. #include <net/ndisc.h>
  27. #include <net/addrconf.h>
  28. #include <net/transp_v6.h>
  29. #include <net/ip6_route.h>
  30. #include <net/tcp_states.h>
  31. #include <linux/errqueue.h>
  32. #include <asm/uaccess.h>
  33. int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
  34. {
  35. struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
  36. struct inet_sock *inet = inet_sk(sk);
  37. struct ipv6_pinfo *np = inet6_sk(sk);
  38. struct in6_addr *daddr, *final_p = NULL, final;
  39. struct dst_entry *dst;
  40. struct flowi fl;
  41. struct ip6_flowlabel *flowlabel = NULL;
  42. int addr_type;
  43. int err;
  44. if (usin->sin6_family == AF_INET) {
  45. if (__ipv6_only_sock(sk))
  46. return -EAFNOSUPPORT;
  47. err = ip4_datagram_connect(sk, uaddr, addr_len);
  48. goto ipv4_connected;
  49. }
  50. if (addr_len < SIN6_LEN_RFC2133)
  51. return -EINVAL;
  52. if (usin->sin6_family != AF_INET6)
  53. return -EAFNOSUPPORT;
  54. memset(&fl, 0, sizeof(fl));
  55. if (np->sndflow) {
  56. fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
  57. if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
  58. flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
  59. if (flowlabel == NULL)
  60. return -EINVAL;
  61. ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
  62. }
  63. }
  64. addr_type = ipv6_addr_type(&usin->sin6_addr);
  65. if (addr_type == IPV6_ADDR_ANY) {
  66. /*
  67. * connect to self
  68. */
  69. usin->sin6_addr.s6_addr[15] = 0x01;
  70. }
  71. daddr = &usin->sin6_addr;
  72. if (addr_type == IPV6_ADDR_MAPPED) {
  73. struct sockaddr_in sin;
  74. if (__ipv6_only_sock(sk)) {
  75. err = -ENETUNREACH;
  76. goto out;
  77. }
  78. sin.sin_family = AF_INET;
  79. sin.sin_addr.s_addr = daddr->s6_addr32[3];
  80. sin.sin_port = usin->sin6_port;
  81. err = ip4_datagram_connect(sk,
  82. (struct sockaddr*) &sin,
  83. sizeof(sin));
  84. ipv4_connected:
  85. if (err)
  86. goto out;
  87. ipv6_addr_set(&np->daddr, 0, 0, htonl(0x0000ffff), inet->daddr);
  88. if (ipv6_addr_any(&np->saddr)) {
  89. ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000ffff),
  90. inet->saddr);
  91. }
  92. if (ipv6_addr_any(&np->rcv_saddr)) {
  93. ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000ffff),
  94. inet->rcv_saddr);
  95. }
  96. goto out;
  97. }
  98. if (addr_type&IPV6_ADDR_LINKLOCAL) {
  99. if (addr_len >= sizeof(struct sockaddr_in6) &&
  100. usin->sin6_scope_id) {
  101. if (sk->sk_bound_dev_if &&
  102. sk->sk_bound_dev_if != usin->sin6_scope_id) {
  103. err = -EINVAL;
  104. goto out;
  105. }
  106. sk->sk_bound_dev_if = usin->sin6_scope_id;
  107. if (!sk->sk_bound_dev_if &&
  108. (addr_type & IPV6_ADDR_MULTICAST))
  109. fl.oif = np->mcast_oif;
  110. }
  111. /* Connect to link-local address requires an interface */
  112. if (!sk->sk_bound_dev_if) {
  113. err = -EINVAL;
  114. goto out;
  115. }
  116. }
  117. ipv6_addr_copy(&np->daddr, daddr);
  118. np->flow_label = fl.fl6_flowlabel;
  119. inet->dport = usin->sin6_port;
  120. /*
  121. * Check for a route to destination an obtain the
  122. * destination cache for it.
  123. */
  124. fl.proto = sk->sk_protocol;
  125. ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
  126. ipv6_addr_copy(&fl.fl6_src, &np->saddr);
  127. fl.oif = sk->sk_bound_dev_if;
  128. fl.fl_ip_dport = inet->dport;
  129. fl.fl_ip_sport = inet->sport;
  130. if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST))
  131. fl.oif = np->mcast_oif;
  132. security_sk_classify_flow(sk, &fl);
  133. if (flowlabel) {
  134. if (flowlabel->opt && flowlabel->opt->srcrt) {
  135. struct rt0_hdr *rt0 = (struct rt0_hdr *) flowlabel->opt->srcrt;
  136. ipv6_addr_copy(&final, &fl.fl6_dst);
  137. ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
  138. final_p = &final;
  139. }
  140. } else if (np->opt && np->opt->srcrt) {
  141. struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
  142. ipv6_addr_copy(&final, &fl.fl6_dst);
  143. ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
  144. final_p = &final;
  145. }
  146. err = ip6_dst_lookup(sk, &dst, &fl);
  147. if (err)
  148. goto out;
  149. if (final_p)
  150. ipv6_addr_copy(&fl.fl6_dst, final_p);
  151. if ((err = xfrm_lookup(&dst, &fl, sk, 1)) < 0)
  152. goto out;
  153. /* source address lookup done in ip6_dst_lookup */
  154. if (ipv6_addr_any(&np->saddr))
  155. ipv6_addr_copy(&np->saddr, &fl.fl6_src);
  156. if (ipv6_addr_any(&np->rcv_saddr)) {
  157. ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src);
  158. inet->rcv_saddr = LOOPBACK4_IPV6;
  159. }
  160. ip6_dst_store(sk, dst,
  161. ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
  162. &np->daddr : NULL,
  163. #ifdef CONFIG_IPV6_SUBTREES
  164. ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
  165. &np->saddr :
  166. #endif
  167. NULL);
  168. sk->sk_state = TCP_ESTABLISHED;
  169. out:
  170. fl6_sock_release(flowlabel);
  171. return err;
  172. }
  173. void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
  174. __be16 port, u32 info, u8 *payload)
  175. {
  176. struct ipv6_pinfo *np = inet6_sk(sk);
  177. struct icmp6hdr *icmph = (struct icmp6hdr *)skb->h.raw;
  178. struct sock_exterr_skb *serr;
  179. if (!np->recverr)
  180. return;
  181. skb = skb_clone(skb, GFP_ATOMIC);
  182. if (!skb)
  183. return;
  184. serr = SKB_EXT_ERR(skb);
  185. serr->ee.ee_errno = err;
  186. serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
  187. serr->ee.ee_type = icmph->icmp6_type;
  188. serr->ee.ee_code = icmph->icmp6_code;
  189. serr->ee.ee_pad = 0;
  190. serr->ee.ee_info = info;
  191. serr->ee.ee_data = 0;
  192. serr->addr_offset = (u8*)&(((struct ipv6hdr*)(icmph+1))->daddr) - skb->nh.raw;
  193. serr->port = port;
  194. skb->h.raw = payload;
  195. __skb_pull(skb, payload - skb->data);
  196. if (sock_queue_err_skb(sk, skb))
  197. kfree_skb(skb);
  198. }
  199. void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info)
  200. {
  201. struct ipv6_pinfo *np = inet6_sk(sk);
  202. struct sock_exterr_skb *serr;
  203. struct ipv6hdr *iph;
  204. struct sk_buff *skb;
  205. if (!np->recverr)
  206. return;
  207. skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
  208. if (!skb)
  209. return;
  210. iph = (struct ipv6hdr*)skb_put(skb, sizeof(struct ipv6hdr));
  211. skb->nh.ipv6h = iph;
  212. ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
  213. serr = SKB_EXT_ERR(skb);
  214. serr->ee.ee_errno = err;
  215. serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
  216. serr->ee.ee_type = 0;
  217. serr->ee.ee_code = 0;
  218. serr->ee.ee_pad = 0;
  219. serr->ee.ee_info = info;
  220. serr->ee.ee_data = 0;
  221. serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
  222. serr->port = fl->fl_ip_dport;
  223. skb->h.raw = skb->tail;
  224. __skb_pull(skb, skb->tail - skb->data);
  225. if (sock_queue_err_skb(sk, skb))
  226. kfree_skb(skb);
  227. }
  228. /*
  229. * Handle MSG_ERRQUEUE
  230. */
  231. int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
  232. {
  233. struct ipv6_pinfo *np = inet6_sk(sk);
  234. struct sock_exterr_skb *serr;
  235. struct sk_buff *skb, *skb2;
  236. struct sockaddr_in6 *sin;
  237. struct {
  238. struct sock_extended_err ee;
  239. struct sockaddr_in6 offender;
  240. } errhdr;
  241. int err;
  242. int copied;
  243. err = -EAGAIN;
  244. skb = skb_dequeue(&sk->sk_error_queue);
  245. if (skb == NULL)
  246. goto out;
  247. copied = skb->len;
  248. if (copied > len) {
  249. msg->msg_flags |= MSG_TRUNC;
  250. copied = len;
  251. }
  252. err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
  253. if (err)
  254. goto out_free_skb;
  255. sock_recv_timestamp(msg, sk, skb);
  256. serr = SKB_EXT_ERR(skb);
  257. sin = (struct sockaddr_in6 *)msg->msg_name;
  258. if (sin) {
  259. sin->sin6_family = AF_INET6;
  260. sin->sin6_flowinfo = 0;
  261. sin->sin6_port = serr->port;
  262. sin->sin6_scope_id = 0;
  263. if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
  264. ipv6_addr_copy(&sin->sin6_addr,
  265. (struct in6_addr *)(skb->nh.raw + serr->addr_offset));
  266. if (np->sndflow)
  267. sin->sin6_flowinfo = *(__be32*)(skb->nh.raw + serr->addr_offset - 24) & IPV6_FLOWINFO_MASK;
  268. if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
  269. sin->sin6_scope_id = IP6CB(skb)->iif;
  270. } else {
  271. ipv6_addr_set(&sin->sin6_addr, 0, 0,
  272. htonl(0xffff),
  273. *(__be32*)(skb->nh.raw + serr->addr_offset));
  274. }
  275. }
  276. memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
  277. sin = &errhdr.offender;
  278. sin->sin6_family = AF_UNSPEC;
  279. if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
  280. sin->sin6_family = AF_INET6;
  281. sin->sin6_flowinfo = 0;
  282. sin->sin6_scope_id = 0;
  283. if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
  284. ipv6_addr_copy(&sin->sin6_addr, &skb->nh.ipv6h->saddr);
  285. if (np->rxopt.all)
  286. datagram_recv_ctl(sk, msg, skb);
  287. if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
  288. sin->sin6_scope_id = IP6CB(skb)->iif;
  289. } else {
  290. struct inet_sock *inet = inet_sk(sk);
  291. ipv6_addr_set(&sin->sin6_addr, 0, 0,
  292. htonl(0xffff),
  293. skb->nh.iph->saddr);
  294. if (inet->cmsg_flags)
  295. ip_cmsg_recv(msg, skb);
  296. }
  297. }
  298. put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
  299. /* Now we could try to dump offended packet options */
  300. msg->msg_flags |= MSG_ERRQUEUE;
  301. err = copied;
  302. /* Reset and regenerate socket error */
  303. spin_lock_bh(&sk->sk_error_queue.lock);
  304. sk->sk_err = 0;
  305. if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
  306. sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
  307. spin_unlock_bh(&sk->sk_error_queue.lock);
  308. sk->sk_error_report(sk);
  309. } else {
  310. spin_unlock_bh(&sk->sk_error_queue.lock);
  311. }
  312. out_free_skb:
  313. kfree_skb(skb);
  314. out:
  315. return err;
  316. }
  317. int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
  318. {
  319. struct ipv6_pinfo *np = inet6_sk(sk);
  320. struct inet6_skb_parm *opt = IP6CB(skb);
  321. if (np->rxopt.bits.rxinfo) {
  322. struct in6_pktinfo src_info;
  323. src_info.ipi6_ifindex = opt->iif;
  324. ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
  325. put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
  326. }
  327. if (np->rxopt.bits.rxhlim) {
  328. int hlim = skb->nh.ipv6h->hop_limit;
  329. put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
  330. }
  331. if (np->rxopt.bits.rxtclass) {
  332. int tclass = (ntohl(*(__be32 *)skb->nh.ipv6h) >> 20) & 0xff;
  333. put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
  334. }
  335. if (np->rxopt.bits.rxflow && (*(__be32*)skb->nh.raw & IPV6_FLOWINFO_MASK)) {
  336. __be32 flowinfo = *(__be32*)skb->nh.raw & IPV6_FLOWINFO_MASK;
  337. put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
  338. }
  339. /* HbH is allowed only once */
  340. if (np->rxopt.bits.hopopts && opt->hop) {
  341. u8 *ptr = skb->nh.raw + opt->hop;
  342. put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
  343. }
  344. if (opt->lastopt &&
  345. (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
  346. /*
  347. * Silly enough, but we need to reparse in order to
  348. * report extension headers (except for HbH)
  349. * in order.
  350. *
  351. * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
  352. * (and WILL NOT be) defined because
  353. * IPV6_RECVDSTOPTS is more generic. --yoshfuji
  354. */
  355. unsigned int off = sizeof(struct ipv6hdr);
  356. u8 nexthdr = skb->nh.ipv6h->nexthdr;
  357. while (off <= opt->lastopt) {
  358. unsigned len;
  359. u8 *ptr = skb->nh.raw + off;
  360. switch(nexthdr) {
  361. case IPPROTO_DSTOPTS:
  362. nexthdr = ptr[0];
  363. len = (ptr[1] + 1) << 3;
  364. if (np->rxopt.bits.dstopts)
  365. put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
  366. break;
  367. case IPPROTO_ROUTING:
  368. nexthdr = ptr[0];
  369. len = (ptr[1] + 1) << 3;
  370. if (np->rxopt.bits.srcrt)
  371. put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
  372. break;
  373. case IPPROTO_AH:
  374. nexthdr = ptr[0];
  375. len = (ptr[1] + 2) << 2;
  376. break;
  377. default:
  378. nexthdr = ptr[0];
  379. len = (ptr[1] + 1) << 3;
  380. break;
  381. }
  382. off += len;
  383. }
  384. }
  385. /* socket options in old style */
  386. if (np->rxopt.bits.rxoinfo) {
  387. struct in6_pktinfo src_info;
  388. src_info.ipi6_ifindex = opt->iif;
  389. ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
  390. put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
  391. }
  392. if (np->rxopt.bits.rxohlim) {
  393. int hlim = skb->nh.ipv6h->hop_limit;
  394. put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
  395. }
  396. if (np->rxopt.bits.ohopopts && opt->hop) {
  397. u8 *ptr = skb->nh.raw + opt->hop;
  398. put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
  399. }
  400. if (np->rxopt.bits.odstopts && opt->dst0) {
  401. u8 *ptr = skb->nh.raw + opt->dst0;
  402. put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
  403. }
  404. if (np->rxopt.bits.osrcrt && opt->srcrt) {
  405. struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(skb->nh.raw + opt->srcrt);
  406. put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
  407. }
  408. if (np->rxopt.bits.odstopts && opt->dst1) {
  409. u8 *ptr = skb->nh.raw + opt->dst1;
  410. put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
  411. }
  412. return 0;
  413. }
  414. int datagram_send_ctl(struct msghdr *msg, struct flowi *fl,
  415. struct ipv6_txoptions *opt,
  416. int *hlimit, int *tclass)
  417. {
  418. struct in6_pktinfo *src_info;
  419. struct cmsghdr *cmsg;
  420. struct ipv6_rt_hdr *rthdr;
  421. struct ipv6_opt_hdr *hdr;
  422. int len;
  423. int err = 0;
  424. for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
  425. int addr_type;
  426. struct net_device *dev = NULL;
  427. if (!CMSG_OK(msg, cmsg)) {
  428. err = -EINVAL;
  429. goto exit_f;
  430. }
  431. if (cmsg->cmsg_level != SOL_IPV6)
  432. continue;
  433. switch (cmsg->cmsg_type) {
  434. case IPV6_PKTINFO:
  435. case IPV6_2292PKTINFO:
  436. if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
  437. err = -EINVAL;
  438. goto exit_f;
  439. }
  440. src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
  441. if (src_info->ipi6_ifindex) {
  442. if (fl->oif && src_info->ipi6_ifindex != fl->oif)
  443. return -EINVAL;
  444. fl->oif = src_info->ipi6_ifindex;
  445. }
  446. addr_type = ipv6_addr_type(&src_info->ipi6_addr);
  447. if (addr_type == IPV6_ADDR_ANY)
  448. break;
  449. if (addr_type & IPV6_ADDR_LINKLOCAL) {
  450. if (!src_info->ipi6_ifindex)
  451. return -EINVAL;
  452. else {
  453. dev = dev_get_by_index(src_info->ipi6_ifindex);
  454. if (!dev)
  455. return -ENODEV;
  456. }
  457. }
  458. if (!ipv6_chk_addr(&src_info->ipi6_addr, dev, 0)) {
  459. if (dev)
  460. dev_put(dev);
  461. err = -EINVAL;
  462. goto exit_f;
  463. }
  464. if (dev)
  465. dev_put(dev);
  466. ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
  467. break;
  468. case IPV6_FLOWINFO:
  469. if (cmsg->cmsg_len < CMSG_LEN(4)) {
  470. err = -EINVAL;
  471. goto exit_f;
  472. }
  473. if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
  474. if ((fl->fl6_flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
  475. err = -EINVAL;
  476. goto exit_f;
  477. }
  478. }
  479. fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
  480. break;
  481. case IPV6_2292HOPOPTS:
  482. case IPV6_HOPOPTS:
  483. if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
  484. err = -EINVAL;
  485. goto exit_f;
  486. }
  487. hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
  488. len = ((hdr->hdrlen + 1) << 3);
  489. if (cmsg->cmsg_len < CMSG_LEN(len)) {
  490. err = -EINVAL;
  491. goto exit_f;
  492. }
  493. if (!capable(CAP_NET_RAW)) {
  494. err = -EPERM;
  495. goto exit_f;
  496. }
  497. opt->opt_nflen += len;
  498. opt->hopopt = hdr;
  499. break;
  500. case IPV6_2292DSTOPTS:
  501. if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
  502. err = -EINVAL;
  503. goto exit_f;
  504. }
  505. hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
  506. len = ((hdr->hdrlen + 1) << 3);
  507. if (cmsg->cmsg_len < CMSG_LEN(len)) {
  508. err = -EINVAL;
  509. goto exit_f;
  510. }
  511. if (!capable(CAP_NET_RAW)) {
  512. err = -EPERM;
  513. goto exit_f;
  514. }
  515. if (opt->dst1opt) {
  516. err = -EINVAL;
  517. goto exit_f;
  518. }
  519. opt->opt_flen += len;
  520. opt->dst1opt = hdr;
  521. break;
  522. case IPV6_DSTOPTS:
  523. case IPV6_RTHDRDSTOPTS:
  524. if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
  525. err = -EINVAL;
  526. goto exit_f;
  527. }
  528. hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
  529. len = ((hdr->hdrlen + 1) << 3);
  530. if (cmsg->cmsg_len < CMSG_LEN(len)) {
  531. err = -EINVAL;
  532. goto exit_f;
  533. }
  534. if (!capable(CAP_NET_RAW)) {
  535. err = -EPERM;
  536. goto exit_f;
  537. }
  538. if (cmsg->cmsg_type == IPV6_DSTOPTS) {
  539. opt->opt_flen += len;
  540. opt->dst1opt = hdr;
  541. } else {
  542. opt->opt_nflen += len;
  543. opt->dst0opt = hdr;
  544. }
  545. break;
  546. case IPV6_2292RTHDR:
  547. case IPV6_RTHDR:
  548. if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
  549. err = -EINVAL;
  550. goto exit_f;
  551. }
  552. rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
  553. switch (rthdr->type) {
  554. case IPV6_SRCRT_TYPE_0:
  555. #ifdef CONFIG_IPV6_MIP6
  556. case IPV6_SRCRT_TYPE_2:
  557. #endif
  558. break;
  559. default:
  560. err = -EINVAL;
  561. goto exit_f;
  562. }
  563. len = ((rthdr->hdrlen + 1) << 3);
  564. if (cmsg->cmsg_len < CMSG_LEN(len)) {
  565. err = -EINVAL;
  566. goto exit_f;
  567. }
  568. /* segments left must also match */
  569. if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
  570. err = -EINVAL;
  571. goto exit_f;
  572. }
  573. opt->opt_nflen += len;
  574. opt->srcrt = rthdr;
  575. if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
  576. int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
  577. opt->opt_nflen += dsthdrlen;
  578. opt->dst0opt = opt->dst1opt;
  579. opt->dst1opt = NULL;
  580. opt->opt_flen -= dsthdrlen;
  581. }
  582. break;
  583. case IPV6_2292HOPLIMIT:
  584. case IPV6_HOPLIMIT:
  585. if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
  586. err = -EINVAL;
  587. goto exit_f;
  588. }
  589. *hlimit = *(int *)CMSG_DATA(cmsg);
  590. break;
  591. case IPV6_TCLASS:
  592. {
  593. int tc;
  594. err = -EINVAL;
  595. if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
  596. goto exit_f;
  597. }
  598. tc = *(int *)CMSG_DATA(cmsg);
  599. if (tc < -1 || tc > 0xff)
  600. goto exit_f;
  601. err = 0;
  602. *tclass = tc;
  603. break;
  604. }
  605. default:
  606. LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
  607. cmsg->cmsg_type);
  608. err = -EINVAL;
  609. break;
  610. };
  611. }
  612. exit_f:
  613. return err;
  614. }