udp.c 24 KB

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  1. /*
  2. * UDP over IPv6
  3. * Linux INET6 implementation
  4. *
  5. * Authors:
  6. * Pedro Roque <roque@di.fc.ul.pt>
  7. *
  8. * Based on linux/ipv4/udp.c
  9. *
  10. * $Id: udp.c,v 1.1.1.1 2007/06/12 07:27:14 eyryu Exp $
  11. *
  12. * Fixes:
  13. * Hideaki YOSHIFUJI : sin6_scope_id support
  14. * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
  15. * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
  16. * a single port at the same time.
  17. * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
  18. * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
  19. *
  20. * This program is free software; you can redistribute it and/or
  21. * modify it under the terms of the GNU General Public License
  22. * as published by the Free Software Foundation; either version
  23. * 2 of the License, or (at your option) any later version.
  24. */
  25. #include <linux/errno.h>
  26. #include <linux/types.h>
  27. #include <linux/socket.h>
  28. #include <linux/sockios.h>
  29. #include <linux/net.h>
  30. #include <linux/in6.h>
  31. #include <linux/netdevice.h>
  32. #include <linux/if_arp.h>
  33. #include <linux/ipv6.h>
  34. #include <linux/icmpv6.h>
  35. #include <linux/init.h>
  36. #include <linux/skbuff.h>
  37. #include <asm/uaccess.h>
  38. #include <net/ndisc.h>
  39. #include <net/protocol.h>
  40. #include <net/transp_v6.h>
  41. #include <net/ip6_route.h>
  42. #include <net/raw.h>
  43. #include <net/tcp_states.h>
  44. #include <net/ip6_checksum.h>
  45. #include <net/xfrm.h>
  46. #include <linux/proc_fs.h>
  47. #include <linux/seq_file.h>
  48. #include "udp_impl.h"
  49. DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6) __read_mostly;
  50. static inline int udp_v6_get_port(struct sock *sk, unsigned short snum)
  51. {
  52. return udp_get_port(sk, snum, ipv6_rcv_saddr_equal);
  53. }
  54. static struct sock *__udp6_lib_lookup(struct in6_addr *saddr, __be16 sport,
  55. struct in6_addr *daddr, __be16 dport,
  56. int dif, struct hlist_head udptable[])
  57. {
  58. struct sock *sk, *result = NULL;
  59. struct hlist_node *node;
  60. unsigned short hnum = ntohs(dport);
  61. int badness = -1;
  62. read_lock(&udp_hash_lock);
  63. sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) {
  64. struct inet_sock *inet = inet_sk(sk);
  65. if (sk->sk_hash == hnum && sk->sk_family == PF_INET6) {
  66. struct ipv6_pinfo *np = inet6_sk(sk);
  67. int score = 0;
  68. if (inet->dport) {
  69. if (inet->dport != sport)
  70. continue;
  71. score++;
  72. }
  73. if (!ipv6_addr_any(&np->rcv_saddr)) {
  74. if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
  75. continue;
  76. score++;
  77. }
  78. if (!ipv6_addr_any(&np->daddr)) {
  79. if (!ipv6_addr_equal(&np->daddr, saddr))
  80. continue;
  81. score++;
  82. }
  83. if (sk->sk_bound_dev_if) {
  84. if (sk->sk_bound_dev_if != dif)
  85. continue;
  86. score++;
  87. }
  88. if(score == 4) {
  89. result = sk;
  90. break;
  91. } else if(score > badness) {
  92. result = sk;
  93. badness = score;
  94. }
  95. }
  96. }
  97. if (result)
  98. sock_hold(result);
  99. read_unlock(&udp_hash_lock);
  100. return result;
  101. }
  102. /*
  103. * This should be easy, if there is something there we
  104. * return it, otherwise we block.
  105. */
  106. int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
  107. struct msghdr *msg, size_t len,
  108. int noblock, int flags, int *addr_len)
  109. {
  110. struct ipv6_pinfo *np = inet6_sk(sk);
  111. struct inet_sock *inet = inet_sk(sk);
  112. struct sk_buff *skb;
  113. size_t copied;
  114. int err, copy_only, is_udplite = IS_UDPLITE(sk);
  115. if (addr_len)
  116. *addr_len=sizeof(struct sockaddr_in6);
  117. if (flags & MSG_ERRQUEUE)
  118. return ipv6_recv_error(sk, msg, len);
  119. try_again:
  120. skb = skb_recv_datagram(sk, flags, noblock, &err);
  121. if (!skb)
  122. goto out;
  123. copied = skb->len - sizeof(struct udphdr);
  124. if (copied > len) {
  125. copied = len;
  126. msg->msg_flags |= MSG_TRUNC;
  127. }
  128. /*
  129. * Decide whether to checksum and/or copy data.
  130. */
  131. copy_only = (skb->ip_summed==CHECKSUM_UNNECESSARY);
  132. if (is_udplite || (!copy_only && msg->msg_flags&MSG_TRUNC)) {
  133. if (__udp_lib_checksum_complete(skb))
  134. goto csum_copy_err;
  135. copy_only = 1;
  136. }
  137. if (copy_only)
  138. err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
  139. msg->msg_iov, copied );
  140. else {
  141. err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
  142. if (err == -EINVAL)
  143. goto csum_copy_err;
  144. }
  145. if (err)
  146. goto out_free;
  147. sock_recv_timestamp(msg, sk, skb);
  148. /* Copy the address. */
  149. if (msg->msg_name) {
  150. struct sockaddr_in6 *sin6;
  151. sin6 = (struct sockaddr_in6 *) msg->msg_name;
  152. sin6->sin6_family = AF_INET6;
  153. sin6->sin6_port = skb->h.uh->source;
  154. sin6->sin6_flowinfo = 0;
  155. sin6->sin6_scope_id = 0;
  156. if (skb->protocol == htons(ETH_P_IP))
  157. ipv6_addr_set(&sin6->sin6_addr, 0, 0,
  158. htonl(0xffff), skb->nh.iph->saddr);
  159. else {
  160. ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
  161. if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
  162. sin6->sin6_scope_id = IP6CB(skb)->iif;
  163. }
  164. }
  165. if (skb->protocol == htons(ETH_P_IP)) {
  166. if (inet->cmsg_flags)
  167. ip_cmsg_recv(msg, skb);
  168. } else {
  169. if (np->rxopt.all)
  170. datagram_recv_ctl(sk, msg, skb);
  171. }
  172. err = copied;
  173. if (flags & MSG_TRUNC)
  174. err = skb->len - sizeof(struct udphdr);
  175. out_free:
  176. skb_free_datagram(sk, skb);
  177. out:
  178. return err;
  179. csum_copy_err:
  180. skb_kill_datagram(sk, skb, flags);
  181. if (flags & MSG_DONTWAIT) {
  182. UDP6_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite);
  183. return -EAGAIN;
  184. }
  185. goto try_again;
  186. }
  187. void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
  188. int type, int code, int offset, __be32 info,
  189. struct hlist_head udptable[] )
  190. {
  191. struct ipv6_pinfo *np;
  192. struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
  193. struct in6_addr *saddr = &hdr->saddr;
  194. struct in6_addr *daddr = &hdr->daddr;
  195. struct udphdr *uh = (struct udphdr*)(skb->data+offset);
  196. struct sock *sk;
  197. int err;
  198. sk = __udp6_lib_lookup(daddr, uh->dest,
  199. saddr, uh->source, inet6_iif(skb), udptable);
  200. if (sk == NULL)
  201. return;
  202. np = inet6_sk(sk);
  203. if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
  204. goto out;
  205. if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
  206. goto out;
  207. if (np->recverr)
  208. ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
  209. sk->sk_err = err;
  210. sk->sk_error_report(sk);
  211. out:
  212. sock_put(sk);
  213. }
  214. static __inline__ void udpv6_err(struct sk_buff *skb,
  215. struct inet6_skb_parm *opt, int type,
  216. int code, int offset, __be32 info )
  217. {
  218. return __udp6_lib_err(skb, opt, type, code, offset, info, udp_hash);
  219. }
  220. int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
  221. {
  222. struct udp_sock *up = udp_sk(sk);
  223. int rc;
  224. if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
  225. goto drop;
  226. /*
  227. * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
  228. */
  229. if ((up->pcflag & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
  230. if (up->pcrlen == 0) { /* full coverage was set */
  231. LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
  232. " %d while full coverage %d requested\n",
  233. UDP_SKB_CB(skb)->cscov, skb->len);
  234. goto drop;
  235. }
  236. if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
  237. LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
  238. "too small, need min %d\n",
  239. UDP_SKB_CB(skb)->cscov, up->pcrlen);
  240. goto drop;
  241. }
  242. }
  243. if (udp_lib_checksum_complete(skb))
  244. goto drop;
  245. if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
  246. /* Note that an ENOMEM error is charged twice */
  247. if (rc == -ENOMEM)
  248. UDP6_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, up->pcflag);
  249. goto drop;
  250. }
  251. UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag);
  252. return 0;
  253. drop:
  254. UDP6_INC_STATS_BH(UDP_MIB_INERRORS, up->pcflag);
  255. kfree_skb(skb);
  256. return -1;
  257. }
  258. static struct sock *udp_v6_mcast_next(struct sock *sk,
  259. __be16 loc_port, struct in6_addr *loc_addr,
  260. __be16 rmt_port, struct in6_addr *rmt_addr,
  261. int dif)
  262. {
  263. struct hlist_node *node;
  264. struct sock *s = sk;
  265. unsigned short num = ntohs(loc_port);
  266. sk_for_each_from(s, node) {
  267. struct inet_sock *inet = inet_sk(s);
  268. if (s->sk_hash == num && s->sk_family == PF_INET6) {
  269. struct ipv6_pinfo *np = inet6_sk(s);
  270. if (inet->dport) {
  271. if (inet->dport != rmt_port)
  272. continue;
  273. }
  274. if (!ipv6_addr_any(&np->daddr) &&
  275. !ipv6_addr_equal(&np->daddr, rmt_addr))
  276. continue;
  277. if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
  278. continue;
  279. if (!ipv6_addr_any(&np->rcv_saddr)) {
  280. if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
  281. continue;
  282. }
  283. if(!inet6_mc_check(s, loc_addr, rmt_addr))
  284. continue;
  285. return s;
  286. }
  287. }
  288. return NULL;
  289. }
  290. /*
  291. * Note: called only from the BH handler context,
  292. * so we don't need to lock the hashes.
  293. */
  294. static int __udp6_lib_mcast_deliver(struct sk_buff *skb, struct in6_addr *saddr,
  295. struct in6_addr *daddr, struct hlist_head udptable[])
  296. {
  297. struct sock *sk, *sk2;
  298. const struct udphdr *uh = skb->h.uh;
  299. int dif;
  300. read_lock(&udp_hash_lock);
  301. sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
  302. dif = inet6_iif(skb);
  303. sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
  304. if (!sk) {
  305. kfree_skb(skb);
  306. goto out;
  307. }
  308. sk2 = sk;
  309. while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
  310. uh->source, saddr, dif))) {
  311. struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
  312. if (buff)
  313. udpv6_queue_rcv_skb(sk2, buff);
  314. }
  315. udpv6_queue_rcv_skb(sk, skb);
  316. out:
  317. read_unlock(&udp_hash_lock);
  318. return 0;
  319. }
  320. static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh)
  321. {
  322. if (uh->check == 0) {
  323. /* RFC 2460 section 8.1 says that we SHOULD log
  324. this error. Well, it is reasonable.
  325. */
  326. LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
  327. return 1;
  328. }
  329. if (skb->ip_summed == CHECKSUM_COMPLETE &&
  330. !csum_ipv6_magic(&skb->nh.ipv6h->saddr, &skb->nh.ipv6h->daddr,
  331. skb->len, IPPROTO_UDP, skb->csum ))
  332. skb->ip_summed = CHECKSUM_UNNECESSARY;
  333. if (skb->ip_summed != CHECKSUM_UNNECESSARY)
  334. skb->csum = ~csum_unfold(csum_ipv6_magic(&skb->nh.ipv6h->saddr,
  335. &skb->nh.ipv6h->daddr,
  336. skb->len, IPPROTO_UDP,
  337. 0));
  338. return (UDP_SKB_CB(skb)->partial_cov = 0);
  339. }
  340. int __udp6_lib_rcv(struct sk_buff **pskb, struct hlist_head udptable[],
  341. int is_udplite)
  342. {
  343. struct sk_buff *skb = *pskb;
  344. struct sock *sk;
  345. struct udphdr *uh;
  346. struct net_device *dev = skb->dev;
  347. struct in6_addr *saddr, *daddr;
  348. u32 ulen = 0;
  349. if (!pskb_may_pull(skb, sizeof(struct udphdr)))
  350. goto short_packet;
  351. saddr = &skb->nh.ipv6h->saddr;
  352. daddr = &skb->nh.ipv6h->daddr;
  353. uh = skb->h.uh;
  354. ulen = ntohs(uh->len);
  355. if (ulen > skb->len)
  356. goto short_packet;
  357. if(! is_udplite ) { /* UDP validates ulen. */
  358. /* Check for jumbo payload */
  359. if (ulen == 0)
  360. ulen = skb->len;
  361. if (ulen < sizeof(*uh))
  362. goto short_packet;
  363. if (ulen < skb->len) {
  364. if (pskb_trim_rcsum(skb, ulen))
  365. goto short_packet;
  366. saddr = &skb->nh.ipv6h->saddr;
  367. daddr = &skb->nh.ipv6h->daddr;
  368. uh = skb->h.uh;
  369. }
  370. if (udp6_csum_init(skb, uh))
  371. goto discard;
  372. } else { /* UDP-Lite validates cscov. */
  373. if (udplite6_csum_init(skb, uh))
  374. goto discard;
  375. }
  376. /*
  377. * Multicast receive code
  378. */
  379. if (ipv6_addr_is_multicast(daddr))
  380. return __udp6_lib_mcast_deliver(skb, saddr, daddr, udptable);
  381. /* Unicast */
  382. /*
  383. * check socket cache ... must talk to Alan about his plans
  384. * for sock caches... i'll skip this for now.
  385. */
  386. sk = __udp6_lib_lookup(saddr, uh->source,
  387. daddr, uh->dest, inet6_iif(skb), udptable);
  388. if (sk == NULL) {
  389. if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
  390. goto discard;
  391. if (udp_lib_checksum_complete(skb))
  392. goto discard;
  393. UDP6_INC_STATS_BH(UDP_MIB_NOPORTS, is_udplite);
  394. icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
  395. kfree_skb(skb);
  396. return(0);
  397. }
  398. /* deliver */
  399. udpv6_queue_rcv_skb(sk, skb);
  400. sock_put(sk);
  401. return(0);
  402. short_packet:
  403. LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
  404. is_udplite? "-Lite" : "", ulen, skb->len);
  405. discard:
  406. UDP6_INC_STATS_BH(UDP_MIB_INERRORS, is_udplite);
  407. kfree_skb(skb);
  408. return(0);
  409. }
  410. static __inline__ int udpv6_rcv(struct sk_buff **pskb)
  411. {
  412. return __udp6_lib_rcv(pskb, udp_hash, 0);
  413. }
  414. /*
  415. * Throw away all pending data and cancel the corking. Socket is locked.
  416. */
  417. static void udp_v6_flush_pending_frames(struct sock *sk)
  418. {
  419. struct udp_sock *up = udp_sk(sk);
  420. if (up->pending) {
  421. up->len = 0;
  422. up->pending = 0;
  423. ip6_flush_pending_frames(sk);
  424. }
  425. }
  426. /*
  427. * Sending
  428. */
  429. static int udp_v6_push_pending_frames(struct sock *sk)
  430. {
  431. struct sk_buff *skb;
  432. struct udphdr *uh;
  433. struct udp_sock *up = udp_sk(sk);
  434. struct inet_sock *inet = inet_sk(sk);
  435. struct flowi *fl = &inet->cork.fl;
  436. int err = 0;
  437. __wsum csum = 0;
  438. /* Grab the skbuff where UDP header space exists. */
  439. if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
  440. goto out;
  441. /*
  442. * Create a UDP header
  443. */
  444. uh = skb->h.uh;
  445. uh->source = fl->fl_ip_sport;
  446. uh->dest = fl->fl_ip_dport;
  447. uh->len = htons(up->len);
  448. uh->check = 0;
  449. if (up->pcflag)
  450. csum = udplite_csum_outgoing(sk, skb);
  451. else
  452. csum = udp_csum_outgoing(sk, skb);
  453. /* add protocol-dependent pseudo-header */
  454. uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
  455. up->len, fl->proto, csum );
  456. if (uh->check == 0)
  457. uh->check = CSUM_MANGLED_0;
  458. err = ip6_push_pending_frames(sk);
  459. out:
  460. up->len = 0;
  461. up->pending = 0;
  462. return err;
  463. }
  464. int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
  465. struct msghdr *msg, size_t len)
  466. {
  467. struct ipv6_txoptions opt_space;
  468. struct udp_sock *up = udp_sk(sk);
  469. struct inet_sock *inet = inet_sk(sk);
  470. struct ipv6_pinfo *np = inet6_sk(sk);
  471. struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
  472. struct in6_addr *daddr, *final_p = NULL, final;
  473. struct ipv6_txoptions *opt = NULL;
  474. struct ip6_flowlabel *flowlabel = NULL;
  475. struct flowi fl;
  476. struct dst_entry *dst;
  477. int addr_len = msg->msg_namelen;
  478. int ulen = len;
  479. int hlimit = -1;
  480. int tclass = -1;
  481. int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
  482. int err;
  483. int connected = 0;
  484. int is_udplite = up->pcflag;
  485. int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
  486. /* destination address check */
  487. if (sin6) {
  488. if (addr_len < offsetof(struct sockaddr, sa_data))
  489. return -EINVAL;
  490. switch (sin6->sin6_family) {
  491. case AF_INET6:
  492. if (addr_len < SIN6_LEN_RFC2133)
  493. return -EINVAL;
  494. daddr = &sin6->sin6_addr;
  495. break;
  496. case AF_INET:
  497. goto do_udp_sendmsg;
  498. case AF_UNSPEC:
  499. msg->msg_name = sin6 = NULL;
  500. msg->msg_namelen = addr_len = 0;
  501. daddr = NULL;
  502. break;
  503. default:
  504. return -EINVAL;
  505. }
  506. } else if (!up->pending) {
  507. if (sk->sk_state != TCP_ESTABLISHED)
  508. return -EDESTADDRREQ;
  509. daddr = &np->daddr;
  510. } else
  511. daddr = NULL;
  512. if (daddr) {
  513. if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) {
  514. struct sockaddr_in sin;
  515. sin.sin_family = AF_INET;
  516. sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
  517. sin.sin_addr.s_addr = daddr->s6_addr32[3];
  518. msg->msg_name = &sin;
  519. msg->msg_namelen = sizeof(sin);
  520. do_udp_sendmsg:
  521. if (__ipv6_only_sock(sk))
  522. return -ENETUNREACH;
  523. return udp_sendmsg(iocb, sk, msg, len);
  524. }
  525. }
  526. if (up->pending == AF_INET)
  527. return udp_sendmsg(iocb, sk, msg, len);
  528. /* Rough check on arithmetic overflow,
  529. better check is made in ip6_append_data().
  530. */
  531. if (len > INT_MAX - sizeof(struct udphdr))
  532. return -EMSGSIZE;
  533. if (up->pending) {
  534. /*
  535. * There are pending frames.
  536. * The socket lock must be held while it's corked.
  537. */
  538. lock_sock(sk);
  539. if (likely(up->pending)) {
  540. if (unlikely(up->pending != AF_INET6)) {
  541. release_sock(sk);
  542. return -EAFNOSUPPORT;
  543. }
  544. dst = NULL;
  545. goto do_append_data;
  546. }
  547. release_sock(sk);
  548. }
  549. ulen += sizeof(struct udphdr);
  550. memset(&fl, 0, sizeof(fl));
  551. if (sin6) {
  552. if (sin6->sin6_port == 0)
  553. return -EINVAL;
  554. fl.fl_ip_dport = sin6->sin6_port;
  555. daddr = &sin6->sin6_addr;
  556. if (np->sndflow) {
  557. fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
  558. if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
  559. flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
  560. if (flowlabel == NULL)
  561. return -EINVAL;
  562. daddr = &flowlabel->dst;
  563. }
  564. }
  565. /*
  566. * Otherwise it will be difficult to maintain
  567. * sk->sk_dst_cache.
  568. */
  569. if (sk->sk_state == TCP_ESTABLISHED &&
  570. ipv6_addr_equal(daddr, &np->daddr))
  571. daddr = &np->daddr;
  572. if (addr_len >= sizeof(struct sockaddr_in6) &&
  573. sin6->sin6_scope_id &&
  574. ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
  575. fl.oif = sin6->sin6_scope_id;
  576. } else {
  577. if (sk->sk_state != TCP_ESTABLISHED)
  578. return -EDESTADDRREQ;
  579. fl.fl_ip_dport = inet->dport;
  580. daddr = &np->daddr;
  581. fl.fl6_flowlabel = np->flow_label;
  582. connected = 1;
  583. }
  584. if (!fl.oif)
  585. fl.oif = sk->sk_bound_dev_if;
  586. if (msg->msg_controllen) {
  587. opt = &opt_space;
  588. memset(opt, 0, sizeof(struct ipv6_txoptions));
  589. opt->tot_len = sizeof(*opt);
  590. err = datagram_send_ctl(msg, &fl, opt, &hlimit, &tclass);
  591. if (err < 0) {
  592. fl6_sock_release(flowlabel);
  593. return err;
  594. }
  595. if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
  596. flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
  597. if (flowlabel == NULL)
  598. return -EINVAL;
  599. }
  600. if (!(opt->opt_nflen|opt->opt_flen))
  601. opt = NULL;
  602. connected = 0;
  603. }
  604. if (opt == NULL)
  605. opt = np->opt;
  606. if (flowlabel)
  607. opt = fl6_merge_options(&opt_space, flowlabel, opt);
  608. opt = ipv6_fixup_options(&opt_space, opt);
  609. fl.proto = sk->sk_protocol;
  610. ipv6_addr_copy(&fl.fl6_dst, daddr);
  611. if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
  612. ipv6_addr_copy(&fl.fl6_src, &np->saddr);
  613. fl.fl_ip_sport = inet->sport;
  614. /* merge ip6_build_xmit from ip6_output */
  615. if (opt && opt->srcrt) {
  616. struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
  617. ipv6_addr_copy(&final, &fl.fl6_dst);
  618. ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
  619. final_p = &final;
  620. connected = 0;
  621. }
  622. if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
  623. fl.oif = np->mcast_oif;
  624. connected = 0;
  625. }
  626. security_sk_classify_flow(sk, &fl);
  627. err = ip6_sk_dst_lookup(sk, &dst, &fl);
  628. if (err)
  629. goto out;
  630. if (final_p)
  631. ipv6_addr_copy(&fl.fl6_dst, final_p);
  632. if ((err = xfrm_lookup(&dst, &fl, sk, 1)) < 0)
  633. goto out;
  634. if (hlimit < 0) {
  635. if (ipv6_addr_is_multicast(&fl.fl6_dst))
  636. hlimit = np->mcast_hops;
  637. else
  638. hlimit = np->hop_limit;
  639. if (hlimit < 0)
  640. hlimit = dst_metric(dst, RTAX_HOPLIMIT);
  641. if (hlimit < 0)
  642. hlimit = ipv6_get_hoplimit(dst->dev);
  643. }
  644. if (tclass < 0) {
  645. tclass = np->tclass;
  646. if (tclass < 0)
  647. tclass = 0;
  648. }
  649. if (msg->msg_flags&MSG_CONFIRM)
  650. goto do_confirm;
  651. back_from_confirm:
  652. lock_sock(sk);
  653. if (unlikely(up->pending)) {
  654. /* The socket is already corked while preparing it. */
  655. /* ... which is an evident application bug. --ANK */
  656. release_sock(sk);
  657. LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
  658. err = -EINVAL;
  659. goto out;
  660. }
  661. up->pending = AF_INET6;
  662. do_append_data:
  663. up->len += ulen;
  664. getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
  665. err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
  666. sizeof(struct udphdr), hlimit, tclass, opt, &fl,
  667. (struct rt6_info*)dst,
  668. corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
  669. if (err)
  670. udp_v6_flush_pending_frames(sk);
  671. else if (!corkreq)
  672. err = udp_v6_push_pending_frames(sk);
  673. else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
  674. up->pending = 0;
  675. if (dst) {
  676. if (connected) {
  677. ip6_dst_store(sk, dst,
  678. ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
  679. &np->daddr : NULL,
  680. #ifdef CONFIG_IPV6_SUBTREES
  681. ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
  682. &np->saddr :
  683. #endif
  684. NULL);
  685. } else {
  686. dst_release(dst);
  687. }
  688. }
  689. if (err > 0)
  690. err = np->recverr ? net_xmit_errno(err) : 0;
  691. release_sock(sk);
  692. out:
  693. fl6_sock_release(flowlabel);
  694. if (!err) {
  695. UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite);
  696. return len;
  697. }
  698. /*
  699. * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
  700. * ENOBUFS might not be good (it's not tunable per se), but otherwise
  701. * we don't have a good statistic (IpOutDiscards but it can be too many
  702. * things). We could add another new stat but at least for now that
  703. * seems like overkill.
  704. */
  705. if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
  706. UDP6_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite);
  707. }
  708. return err;
  709. do_confirm:
  710. dst_confirm(dst);
  711. if (!(msg->msg_flags&MSG_PROBE) || len)
  712. goto back_from_confirm;
  713. err = 0;
  714. goto out;
  715. }
  716. int udpv6_destroy_sock(struct sock *sk)
  717. {
  718. lock_sock(sk);
  719. udp_v6_flush_pending_frames(sk);
  720. release_sock(sk);
  721. inet6_destroy_sock(sk);
  722. return 0;
  723. }
  724. /*
  725. * Socket option code for UDP
  726. */
  727. int udpv6_setsockopt(struct sock *sk, int level, int optname,
  728. char __user *optval, int optlen)
  729. {
  730. if (level == SOL_UDP || level == SOL_UDPLITE)
  731. return udp_lib_setsockopt(sk, level, optname, optval, optlen,
  732. udp_v6_push_pending_frames);
  733. return ipv6_setsockopt(sk, level, optname, optval, optlen);
  734. }
  735. #ifdef CONFIG_COMPAT
  736. int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
  737. char __user *optval, int optlen)
  738. {
  739. if (level == SOL_UDP || level == SOL_UDPLITE)
  740. return udp_lib_setsockopt(sk, level, optname, optval, optlen,
  741. udp_v6_push_pending_frames);
  742. return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
  743. }
  744. #endif
  745. int udpv6_getsockopt(struct sock *sk, int level, int optname,
  746. char __user *optval, int __user *optlen)
  747. {
  748. if (level == SOL_UDP || level == SOL_UDPLITE)
  749. return udp_lib_getsockopt(sk, level, optname, optval, optlen);
  750. return ipv6_getsockopt(sk, level, optname, optval, optlen);
  751. }
  752. #ifdef CONFIG_COMPAT
  753. int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
  754. char __user *optval, int __user *optlen)
  755. {
  756. if (level == SOL_UDP || level == SOL_UDPLITE)
  757. return udp_lib_getsockopt(sk, level, optname, optval, optlen);
  758. return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
  759. }
  760. #endif
  761. static struct inet6_protocol udpv6_protocol = {
  762. .handler = udpv6_rcv,
  763. .err_handler = udpv6_err,
  764. .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
  765. };
  766. /* ------------------------------------------------------------------------ */
  767. #ifdef CONFIG_PROC_FS
  768. static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
  769. {
  770. struct inet_sock *inet = inet_sk(sp);
  771. struct ipv6_pinfo *np = inet6_sk(sp);
  772. struct in6_addr *dest, *src;
  773. __u16 destp, srcp;
  774. dest = &np->daddr;
  775. src = &np->rcv_saddr;
  776. destp = ntohs(inet->dport);
  777. srcp = ntohs(inet->sport);
  778. seq_printf(seq,
  779. "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
  780. "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
  781. bucket,
  782. src->s6_addr32[0], src->s6_addr32[1],
  783. src->s6_addr32[2], src->s6_addr32[3], srcp,
  784. dest->s6_addr32[0], dest->s6_addr32[1],
  785. dest->s6_addr32[2], dest->s6_addr32[3], destp,
  786. sp->sk_state,
  787. atomic_read(&sp->sk_wmem_alloc),
  788. atomic_read(&sp->sk_rmem_alloc),
  789. 0, 0L, 0,
  790. sock_i_uid(sp), 0,
  791. sock_i_ino(sp),
  792. atomic_read(&sp->sk_refcnt), sp);
  793. }
  794. int udp6_seq_show(struct seq_file *seq, void *v)
  795. {
  796. if (v == SEQ_START_TOKEN)
  797. seq_printf(seq,
  798. " sl "
  799. "local_address "
  800. "remote_address "
  801. "st tx_queue rx_queue tr tm->when retrnsmt"
  802. " uid timeout inode\n");
  803. else
  804. udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
  805. return 0;
  806. }
  807. static struct file_operations udp6_seq_fops;
  808. static struct udp_seq_afinfo udp6_seq_afinfo = {
  809. .owner = THIS_MODULE,
  810. .name = "udp6",
  811. .family = AF_INET6,
  812. .hashtable = udp_hash,
  813. .seq_show = udp6_seq_show,
  814. .seq_fops = &udp6_seq_fops,
  815. };
  816. int __init udp6_proc_init(void)
  817. {
  818. return udp_proc_register(&udp6_seq_afinfo);
  819. }
  820. void udp6_proc_exit(void) {
  821. udp_proc_unregister(&udp6_seq_afinfo);
  822. }
  823. #endif /* CONFIG_PROC_FS */
  824. /* ------------------------------------------------------------------------ */
  825. struct proto udpv6_prot = {
  826. .name = "UDPv6",
  827. .owner = THIS_MODULE,
  828. .close = udp_lib_close,
  829. .connect = ip6_datagram_connect,
  830. .disconnect = udp_disconnect,
  831. .ioctl = udp_ioctl,
  832. .destroy = udpv6_destroy_sock,
  833. .setsockopt = udpv6_setsockopt,
  834. .getsockopt = udpv6_getsockopt,
  835. .sendmsg = udpv6_sendmsg,
  836. .recvmsg = udpv6_recvmsg,
  837. .backlog_rcv = udpv6_queue_rcv_skb,
  838. .hash = udp_lib_hash,
  839. .unhash = udp_lib_unhash,
  840. .get_port = udp_v6_get_port,
  841. .obj_size = sizeof(struct udp6_sock),
  842. #ifdef CONFIG_COMPAT
  843. .compat_setsockopt = compat_udpv6_setsockopt,
  844. .compat_getsockopt = compat_udpv6_getsockopt,
  845. #endif
  846. };
  847. static struct inet_protosw udpv6_protosw = {
  848. .type = SOCK_DGRAM,
  849. .protocol = IPPROTO_UDP,
  850. .prot = &udpv6_prot,
  851. .ops = &inet6_dgram_ops,
  852. .capability =-1,
  853. .no_check = UDP_CSUM_DEFAULT,
  854. .flags = INET_PROTOSW_PERMANENT,
  855. };
  856. void __init udpv6_init(void)
  857. {
  858. if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
  859. printk(KERN_ERR "udpv6_init: Could not register protocol\n");
  860. inet6_register_protosw(&udpv6_protosw);
  861. }