raw.c 30 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * RAW sockets for IPv6
  4. * Linux INET6 implementation
  5. *
  6. * Authors:
  7. * Pedro Roque <roque@di.fc.ul.pt>
  8. *
  9. * Adapted from linux/net/ipv4/raw.c
  10. *
  11. * Fixes:
  12. * Hideaki YOSHIFUJI : sin6_scope_id support
  13. * YOSHIFUJI,H.@USAGI : raw checksum (RFC2292(bis) compliance)
  14. * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
  15. */
  16. #include <linux/errno.h>
  17. #include <linux/types.h>
  18. #include <linux/socket.h>
  19. #include <linux/slab.h>
  20. #include <linux/sockios.h>
  21. #include <linux/net.h>
  22. #include <linux/in6.h>
  23. #include <linux/netdevice.h>
  24. #include <linux/if_arp.h>
  25. #include <linux/icmpv6.h>
  26. #include <linux/netfilter.h>
  27. #include <linux/netfilter_ipv6.h>
  28. #include <linux/skbuff.h>
  29. #include <linux/compat.h>
  30. #include <linux/uaccess.h>
  31. #include <asm/ioctls.h>
  32. #include <net/net_namespace.h>
  33. #include <net/ip.h>
  34. #include <net/sock.h>
  35. #include <net/snmp.h>
  36. #include <net/ipv6.h>
  37. #include <net/ndisc.h>
  38. #include <net/protocol.h>
  39. #include <net/ip6_route.h>
  40. #include <net/ip6_checksum.h>
  41. #include <net/addrconf.h>
  42. #include <net/transp_v6.h>
  43. #include <net/udp.h>
  44. #include <net/inet_common.h>
  45. #include <net/tcp_states.h>
  46. #if IS_ENABLED(CONFIG_IPV6_MIP6)
  47. #include <net/mip6.h>
  48. #endif
  49. #include <linux/mroute6.h>
  50. #include <net/raw.h>
  51. #include <net/rawv6.h>
  52. #include <net/xfrm.h>
  53. #include <linux/proc_fs.h>
  54. #include <linux/seq_file.h>
  55. #include <linux/export.h>
  56. #define ICMPV6_HDRLEN 4 /* ICMPv6 header, RFC 4443 Section 2.1 */
  57. struct raw_hashinfo raw_v6_hashinfo = {
  58. .lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock),
  59. };
  60. EXPORT_SYMBOL_GPL(raw_v6_hashinfo);
  61. struct sock *__raw_v6_lookup(struct net *net, struct sock *sk,
  62. unsigned short num, const struct in6_addr *loc_addr,
  63. const struct in6_addr *rmt_addr, int dif, int sdif)
  64. {
  65. bool is_multicast = ipv6_addr_is_multicast(loc_addr);
  66. sk_for_each_from(sk)
  67. if (inet_sk(sk)->inet_num == num) {
  68. if (!net_eq(sock_net(sk), net))
  69. continue;
  70. if (!ipv6_addr_any(&sk->sk_v6_daddr) &&
  71. !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr))
  72. continue;
  73. if (!raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if,
  74. dif, sdif))
  75. continue;
  76. if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
  77. if (ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))
  78. goto found;
  79. if (is_multicast &&
  80. inet6_mc_check(sk, loc_addr, rmt_addr))
  81. goto found;
  82. continue;
  83. }
  84. goto found;
  85. }
  86. sk = NULL;
  87. found:
  88. return sk;
  89. }
  90. EXPORT_SYMBOL_GPL(__raw_v6_lookup);
  91. /*
  92. * 0 - deliver
  93. * 1 - block
  94. */
  95. static int icmpv6_filter(const struct sock *sk, const struct sk_buff *skb)
  96. {
  97. struct icmp6hdr _hdr;
  98. const struct icmp6hdr *hdr;
  99. /* We require only the four bytes of the ICMPv6 header, not any
  100. * additional bytes of message body in "struct icmp6hdr".
  101. */
  102. hdr = skb_header_pointer(skb, skb_transport_offset(skb),
  103. ICMPV6_HDRLEN, &_hdr);
  104. if (hdr) {
  105. const __u32 *data = &raw6_sk(sk)->filter.data[0];
  106. unsigned int type = hdr->icmp6_type;
  107. return (data[type >> 5] & (1U << (type & 31))) != 0;
  108. }
  109. return 1;
  110. }
  111. #if IS_ENABLED(CONFIG_IPV6_MIP6)
  112. typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb);
  113. static mh_filter_t __rcu *mh_filter __read_mostly;
  114. int rawv6_mh_filter_register(mh_filter_t filter)
  115. {
  116. rcu_assign_pointer(mh_filter, filter);
  117. return 0;
  118. }
  119. EXPORT_SYMBOL(rawv6_mh_filter_register);
  120. int rawv6_mh_filter_unregister(mh_filter_t filter)
  121. {
  122. RCU_INIT_POINTER(mh_filter, NULL);
  123. synchronize_rcu();
  124. return 0;
  125. }
  126. EXPORT_SYMBOL(rawv6_mh_filter_unregister);
  127. #endif
  128. /*
  129. * demultiplex raw sockets.
  130. * (should consider queueing the skb in the sock receive_queue
  131. * without calling rawv6.c)
  132. *
  133. * Caller owns SKB so we must make clones.
  134. */
  135. static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
  136. {
  137. const struct in6_addr *saddr;
  138. const struct in6_addr *daddr;
  139. struct sock *sk;
  140. bool delivered = false;
  141. __u8 hash;
  142. struct net *net;
  143. saddr = &ipv6_hdr(skb)->saddr;
  144. daddr = saddr + 1;
  145. hash = nexthdr & (RAW_HTABLE_SIZE - 1);
  146. read_lock(&raw_v6_hashinfo.lock);
  147. sk = sk_head(&raw_v6_hashinfo.ht[hash]);
  148. if (!sk)
  149. goto out;
  150. net = dev_net(skb->dev);
  151. sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr,
  152. inet6_iif(skb), inet6_sdif(skb));
  153. while (sk) {
  154. int filtered;
  155. delivered = true;
  156. switch (nexthdr) {
  157. case IPPROTO_ICMPV6:
  158. filtered = icmpv6_filter(sk, skb);
  159. break;
  160. #if IS_ENABLED(CONFIG_IPV6_MIP6)
  161. case IPPROTO_MH:
  162. {
  163. /* XXX: To validate MH only once for each packet,
  164. * this is placed here. It should be after checking
  165. * xfrm policy, however it doesn't. The checking xfrm
  166. * policy is placed in rawv6_rcv() because it is
  167. * required for each socket.
  168. */
  169. mh_filter_t *filter;
  170. filter = rcu_dereference(mh_filter);
  171. filtered = filter ? (*filter)(sk, skb) : 0;
  172. break;
  173. }
  174. #endif
  175. default:
  176. filtered = 0;
  177. break;
  178. }
  179. if (filtered < 0)
  180. break;
  181. if (filtered == 0) {
  182. struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
  183. /* Not releasing hash table! */
  184. if (clone) {
  185. nf_reset_ct(clone);
  186. rawv6_rcv(sk, clone);
  187. }
  188. }
  189. sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr,
  190. inet6_iif(skb), inet6_sdif(skb));
  191. }
  192. out:
  193. read_unlock(&raw_v6_hashinfo.lock);
  194. return delivered;
  195. }
  196. bool raw6_local_deliver(struct sk_buff *skb, int nexthdr)
  197. {
  198. struct sock *raw_sk;
  199. raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (RAW_HTABLE_SIZE - 1)]);
  200. if (raw_sk && !ipv6_raw_deliver(skb, nexthdr))
  201. raw_sk = NULL;
  202. return raw_sk != NULL;
  203. }
  204. /* This cleans up af_inet6 a bit. -DaveM */
  205. static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
  206. {
  207. struct inet_sock *inet = inet_sk(sk);
  208. struct ipv6_pinfo *np = inet6_sk(sk);
  209. struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
  210. __be32 v4addr = 0;
  211. int addr_type;
  212. int err;
  213. if (addr_len < SIN6_LEN_RFC2133)
  214. return -EINVAL;
  215. if (addr->sin6_family != AF_INET6)
  216. return -EINVAL;
  217. addr_type = ipv6_addr_type(&addr->sin6_addr);
  218. /* Raw sockets are IPv6 only */
  219. if (addr_type == IPV6_ADDR_MAPPED)
  220. return -EADDRNOTAVAIL;
  221. lock_sock(sk);
  222. err = -EINVAL;
  223. if (sk->sk_state != TCP_CLOSE)
  224. goto out;
  225. rcu_read_lock();
  226. /* Check if the address belongs to the host. */
  227. if (addr_type != IPV6_ADDR_ANY) {
  228. struct net_device *dev = NULL;
  229. if (__ipv6_addr_needs_scope_id(addr_type)) {
  230. if (addr_len >= sizeof(struct sockaddr_in6) &&
  231. addr->sin6_scope_id) {
  232. /* Override any existing binding, if another
  233. * one is supplied by user.
  234. */
  235. sk->sk_bound_dev_if = addr->sin6_scope_id;
  236. }
  237. /* Binding to link-local address requires an interface */
  238. if (!sk->sk_bound_dev_if)
  239. goto out_unlock;
  240. }
  241. if (sk->sk_bound_dev_if) {
  242. err = -ENODEV;
  243. dev = dev_get_by_index_rcu(sock_net(sk),
  244. sk->sk_bound_dev_if);
  245. if (!dev)
  246. goto out_unlock;
  247. }
  248. /* ipv4 addr of the socket is invalid. Only the
  249. * unspecified and mapped address have a v4 equivalent.
  250. */
  251. v4addr = LOOPBACK4_IPV6;
  252. if (!(addr_type & IPV6_ADDR_MULTICAST) &&
  253. !ipv6_can_nonlocal_bind(sock_net(sk), inet)) {
  254. err = -EADDRNOTAVAIL;
  255. if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr,
  256. dev, 0)) {
  257. goto out_unlock;
  258. }
  259. }
  260. }
  261. inet->inet_rcv_saddr = inet->inet_saddr = v4addr;
  262. sk->sk_v6_rcv_saddr = addr->sin6_addr;
  263. if (!(addr_type & IPV6_ADDR_MULTICAST))
  264. np->saddr = addr->sin6_addr;
  265. err = 0;
  266. out_unlock:
  267. rcu_read_unlock();
  268. out:
  269. release_sock(sk);
  270. return err;
  271. }
  272. static void rawv6_err(struct sock *sk, struct sk_buff *skb,
  273. struct inet6_skb_parm *opt,
  274. u8 type, u8 code, int offset, __be32 info)
  275. {
  276. struct inet_sock *inet = inet_sk(sk);
  277. struct ipv6_pinfo *np = inet6_sk(sk);
  278. int err;
  279. int harderr;
  280. /* Report error on raw socket, if:
  281. 1. User requested recverr.
  282. 2. Socket is connected (otherwise the error indication
  283. is useless without recverr and error is hard.
  284. */
  285. if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
  286. return;
  287. harderr = icmpv6_err_convert(type, code, &err);
  288. if (type == ICMPV6_PKT_TOOBIG) {
  289. ip6_sk_update_pmtu(skb, sk, info);
  290. harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
  291. }
  292. if (type == NDISC_REDIRECT) {
  293. ip6_sk_redirect(skb, sk);
  294. return;
  295. }
  296. if (np->recverr) {
  297. u8 *payload = skb->data;
  298. if (!inet->hdrincl)
  299. payload += offset;
  300. ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
  301. }
  302. if (np->recverr || harderr) {
  303. sk->sk_err = err;
  304. sk->sk_error_report(sk);
  305. }
  306. }
  307. void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
  308. u8 type, u8 code, int inner_offset, __be32 info)
  309. {
  310. struct sock *sk;
  311. int hash;
  312. const struct in6_addr *saddr, *daddr;
  313. struct net *net;
  314. hash = nexthdr & (RAW_HTABLE_SIZE - 1);
  315. read_lock(&raw_v6_hashinfo.lock);
  316. sk = sk_head(&raw_v6_hashinfo.ht[hash]);
  317. if (sk) {
  318. /* Note: ipv6_hdr(skb) != skb->data */
  319. const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data;
  320. saddr = &ip6h->saddr;
  321. daddr = &ip6h->daddr;
  322. net = dev_net(skb->dev);
  323. while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr,
  324. inet6_iif(skb), inet6_iif(skb)))) {
  325. rawv6_err(sk, skb, NULL, type, code,
  326. inner_offset, info);
  327. sk = sk_next(sk);
  328. }
  329. }
  330. read_unlock(&raw_v6_hashinfo.lock);
  331. }
  332. static inline int rawv6_rcv_skb(struct sock *sk, struct sk_buff *skb)
  333. {
  334. if ((raw6_sk(sk)->checksum || rcu_access_pointer(sk->sk_filter)) &&
  335. skb_checksum_complete(skb)) {
  336. atomic_inc(&sk->sk_drops);
  337. kfree_skb(skb);
  338. return NET_RX_DROP;
  339. }
  340. /* Charge it to the socket. */
  341. skb_dst_drop(skb);
  342. if (sock_queue_rcv_skb(sk, skb) < 0) {
  343. kfree_skb(skb);
  344. return NET_RX_DROP;
  345. }
  346. return 0;
  347. }
  348. /*
  349. * This is next to useless...
  350. * if we demultiplex in network layer we don't need the extra call
  351. * just to queue the skb...
  352. * maybe we could have the network decide upon a hint if it
  353. * should call raw_rcv for demultiplexing
  354. */
  355. int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
  356. {
  357. struct inet_sock *inet = inet_sk(sk);
  358. struct raw6_sock *rp = raw6_sk(sk);
  359. if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
  360. atomic_inc(&sk->sk_drops);
  361. kfree_skb(skb);
  362. return NET_RX_DROP;
  363. }
  364. if (!rp->checksum)
  365. skb->ip_summed = CHECKSUM_UNNECESSARY;
  366. if (skb->ip_summed == CHECKSUM_COMPLETE) {
  367. skb_postpull_rcsum(skb, skb_network_header(skb),
  368. skb_network_header_len(skb));
  369. if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
  370. &ipv6_hdr(skb)->daddr,
  371. skb->len, inet->inet_num, skb->csum))
  372. skb->ip_summed = CHECKSUM_UNNECESSARY;
  373. }
  374. if (!skb_csum_unnecessary(skb))
  375. skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
  376. &ipv6_hdr(skb)->daddr,
  377. skb->len,
  378. inet->inet_num, 0));
  379. if (inet->hdrincl) {
  380. if (skb_checksum_complete(skb)) {
  381. atomic_inc(&sk->sk_drops);
  382. kfree_skb(skb);
  383. return NET_RX_DROP;
  384. }
  385. }
  386. rawv6_rcv_skb(sk, skb);
  387. return 0;
  388. }
  389. /*
  390. * This should be easy, if there is something there
  391. * we return it, otherwise we block.
  392. */
  393. static int rawv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
  394. int noblock, int flags, int *addr_len)
  395. {
  396. struct ipv6_pinfo *np = inet6_sk(sk);
  397. DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
  398. struct sk_buff *skb;
  399. size_t copied;
  400. int err;
  401. if (flags & MSG_OOB)
  402. return -EOPNOTSUPP;
  403. if (flags & MSG_ERRQUEUE)
  404. return ipv6_recv_error(sk, msg, len, addr_len);
  405. if (np->rxpmtu && np->rxopt.bits.rxpmtu)
  406. return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
  407. skb = skb_recv_datagram(sk, flags, noblock, &err);
  408. if (!skb)
  409. goto out;
  410. copied = skb->len;
  411. if (copied > len) {
  412. copied = len;
  413. msg->msg_flags |= MSG_TRUNC;
  414. }
  415. if (skb_csum_unnecessary(skb)) {
  416. err = skb_copy_datagram_msg(skb, 0, msg, copied);
  417. } else if (msg->msg_flags&MSG_TRUNC) {
  418. if (__skb_checksum_complete(skb))
  419. goto csum_copy_err;
  420. err = skb_copy_datagram_msg(skb, 0, msg, copied);
  421. } else {
  422. err = skb_copy_and_csum_datagram_msg(skb, 0, msg);
  423. if (err == -EINVAL)
  424. goto csum_copy_err;
  425. }
  426. if (err)
  427. goto out_free;
  428. /* Copy the address. */
  429. if (sin6) {
  430. sin6->sin6_family = AF_INET6;
  431. sin6->sin6_port = 0;
  432. sin6->sin6_addr = ipv6_hdr(skb)->saddr;
  433. sin6->sin6_flowinfo = 0;
  434. sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
  435. inet6_iif(skb));
  436. *addr_len = sizeof(*sin6);
  437. }
  438. sock_recv_ts_and_drops(msg, sk, skb);
  439. if (np->rxopt.all)
  440. ip6_datagram_recv_ctl(sk, msg, skb);
  441. err = copied;
  442. if (flags & MSG_TRUNC)
  443. err = skb->len;
  444. out_free:
  445. skb_free_datagram(sk, skb);
  446. out:
  447. return err;
  448. csum_copy_err:
  449. skb_kill_datagram(sk, skb, flags);
  450. /* Error for blocking case is chosen to masquerade
  451. as some normal condition.
  452. */
  453. err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
  454. goto out;
  455. }
  456. static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
  457. struct raw6_sock *rp)
  458. {
  459. struct sk_buff *skb;
  460. int err = 0;
  461. int offset;
  462. int len;
  463. int total_len;
  464. __wsum tmp_csum;
  465. __sum16 csum;
  466. if (!rp->checksum)
  467. goto send;
  468. skb = skb_peek(&sk->sk_write_queue);
  469. if (!skb)
  470. goto out;
  471. offset = rp->offset;
  472. total_len = inet_sk(sk)->cork.base.length;
  473. if (offset >= total_len - 1) {
  474. err = -EINVAL;
  475. ip6_flush_pending_frames(sk);
  476. goto out;
  477. }
  478. /* should be check HW csum miyazawa */
  479. if (skb_queue_len(&sk->sk_write_queue) == 1) {
  480. /*
  481. * Only one fragment on the socket.
  482. */
  483. tmp_csum = skb->csum;
  484. } else {
  485. struct sk_buff *csum_skb = NULL;
  486. tmp_csum = 0;
  487. skb_queue_walk(&sk->sk_write_queue, skb) {
  488. tmp_csum = csum_add(tmp_csum, skb->csum);
  489. if (csum_skb)
  490. continue;
  491. len = skb->len - skb_transport_offset(skb);
  492. if (offset >= len) {
  493. offset -= len;
  494. continue;
  495. }
  496. csum_skb = skb;
  497. }
  498. skb = csum_skb;
  499. }
  500. offset += skb_transport_offset(skb);
  501. err = skb_copy_bits(skb, offset, &csum, 2);
  502. if (err < 0) {
  503. ip6_flush_pending_frames(sk);
  504. goto out;
  505. }
  506. /* in case cksum was not initialized */
  507. if (unlikely(csum))
  508. tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
  509. csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
  510. total_len, fl6->flowi6_proto, tmp_csum);
  511. if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP)
  512. csum = CSUM_MANGLED_0;
  513. BUG_ON(skb_store_bits(skb, offset, &csum, 2));
  514. send:
  515. err = ip6_push_pending_frames(sk);
  516. out:
  517. return err;
  518. }
  519. static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
  520. struct flowi6 *fl6, struct dst_entry **dstp,
  521. unsigned int flags, const struct sockcm_cookie *sockc)
  522. {
  523. struct ipv6_pinfo *np = inet6_sk(sk);
  524. struct net *net = sock_net(sk);
  525. struct ipv6hdr *iph;
  526. struct sk_buff *skb;
  527. int err;
  528. struct rt6_info *rt = (struct rt6_info *)*dstp;
  529. int hlen = LL_RESERVED_SPACE(rt->dst.dev);
  530. int tlen = rt->dst.dev->needed_tailroom;
  531. if (length > rt->dst.dev->mtu) {
  532. ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu);
  533. return -EMSGSIZE;
  534. }
  535. if (length < sizeof(struct ipv6hdr))
  536. return -EINVAL;
  537. if (flags&MSG_PROBE)
  538. goto out;
  539. skb = sock_alloc_send_skb(sk,
  540. length + hlen + tlen + 15,
  541. flags & MSG_DONTWAIT, &err);
  542. if (!skb)
  543. goto error;
  544. skb_reserve(skb, hlen);
  545. skb->protocol = htons(ETH_P_IPV6);
  546. skb->priority = sk->sk_priority;
  547. skb->mark = sockc->mark;
  548. skb->tstamp = sockc->transmit_time;
  549. skb_put(skb, length);
  550. skb_reset_network_header(skb);
  551. iph = ipv6_hdr(skb);
  552. skb->ip_summed = CHECKSUM_NONE;
  553. skb_setup_tx_timestamp(skb, sockc->tsflags);
  554. if (flags & MSG_CONFIRM)
  555. skb_set_dst_pending_confirm(skb, 1);
  556. skb->transport_header = skb->network_header;
  557. err = memcpy_from_msg(iph, msg, length);
  558. if (err) {
  559. err = -EFAULT;
  560. kfree_skb(skb);
  561. goto error;
  562. }
  563. skb_dst_set(skb, &rt->dst);
  564. *dstp = NULL;
  565. /* if egress device is enslaved to an L3 master device pass the
  566. * skb to its handler for processing
  567. */
  568. skb = l3mdev_ip6_out(sk, skb);
  569. if (unlikely(!skb))
  570. return 0;
  571. /* Acquire rcu_read_lock() in case we need to use rt->rt6i_idev
  572. * in the error path. Since skb has been freed, the dst could
  573. * have been queued for deletion.
  574. */
  575. rcu_read_lock();
  576. IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
  577. err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, skb,
  578. NULL, rt->dst.dev, dst_output);
  579. if (err > 0)
  580. err = net_xmit_errno(err);
  581. if (err) {
  582. IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
  583. rcu_read_unlock();
  584. goto error_check;
  585. }
  586. rcu_read_unlock();
  587. out:
  588. return 0;
  589. error:
  590. IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
  591. error_check:
  592. if (err == -ENOBUFS && !np->recverr)
  593. err = 0;
  594. return err;
  595. }
  596. struct raw6_frag_vec {
  597. struct msghdr *msg;
  598. int hlen;
  599. char c[4];
  600. };
  601. static int rawv6_probe_proto_opt(struct raw6_frag_vec *rfv, struct flowi6 *fl6)
  602. {
  603. int err = 0;
  604. switch (fl6->flowi6_proto) {
  605. case IPPROTO_ICMPV6:
  606. rfv->hlen = 2;
  607. err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
  608. if (!err) {
  609. fl6->fl6_icmp_type = rfv->c[0];
  610. fl6->fl6_icmp_code = rfv->c[1];
  611. }
  612. break;
  613. case IPPROTO_MH:
  614. rfv->hlen = 4;
  615. err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
  616. if (!err)
  617. fl6->fl6_mh_type = rfv->c[2];
  618. }
  619. return err;
  620. }
  621. static int raw6_getfrag(void *from, char *to, int offset, int len, int odd,
  622. struct sk_buff *skb)
  623. {
  624. struct raw6_frag_vec *rfv = from;
  625. if (offset < rfv->hlen) {
  626. int copy = min(rfv->hlen - offset, len);
  627. if (skb->ip_summed == CHECKSUM_PARTIAL)
  628. memcpy(to, rfv->c + offset, copy);
  629. else
  630. skb->csum = csum_block_add(
  631. skb->csum,
  632. csum_partial_copy_nocheck(rfv->c + offset,
  633. to, copy),
  634. odd);
  635. odd = 0;
  636. offset += copy;
  637. to += copy;
  638. len -= copy;
  639. if (!len)
  640. return 0;
  641. }
  642. offset -= rfv->hlen;
  643. return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
  644. }
  645. static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
  646. {
  647. struct ipv6_txoptions *opt_to_free = NULL;
  648. struct ipv6_txoptions opt_space;
  649. DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
  650. struct in6_addr *daddr, *final_p, final;
  651. struct inet_sock *inet = inet_sk(sk);
  652. struct ipv6_pinfo *np = inet6_sk(sk);
  653. struct raw6_sock *rp = raw6_sk(sk);
  654. struct ipv6_txoptions *opt = NULL;
  655. struct ip6_flowlabel *flowlabel = NULL;
  656. struct dst_entry *dst = NULL;
  657. struct raw6_frag_vec rfv;
  658. struct flowi6 fl6;
  659. struct ipcm6_cookie ipc6;
  660. int addr_len = msg->msg_namelen;
  661. int hdrincl;
  662. u16 proto;
  663. int err;
  664. /* Rough check on arithmetic overflow,
  665. better check is made in ip6_append_data().
  666. */
  667. if (len > INT_MAX)
  668. return -EMSGSIZE;
  669. /* Mirror BSD error message compatibility */
  670. if (msg->msg_flags & MSG_OOB)
  671. return -EOPNOTSUPP;
  672. /* hdrincl should be READ_ONCE(inet->hdrincl)
  673. * but READ_ONCE() doesn't work with bit fields.
  674. * Doing this indirectly yields the same result.
  675. */
  676. hdrincl = inet->hdrincl;
  677. hdrincl = READ_ONCE(hdrincl);
  678. /*
  679. * Get and verify the address.
  680. */
  681. memset(&fl6, 0, sizeof(fl6));
  682. fl6.flowi6_mark = sk->sk_mark;
  683. fl6.flowi6_uid = sk->sk_uid;
  684. ipcm6_init(&ipc6);
  685. ipc6.sockc.tsflags = sk->sk_tsflags;
  686. ipc6.sockc.mark = sk->sk_mark;
  687. if (sin6) {
  688. if (addr_len < SIN6_LEN_RFC2133)
  689. return -EINVAL;
  690. if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
  691. return -EAFNOSUPPORT;
  692. /* port is the proto value [0..255] carried in nexthdr */
  693. proto = ntohs(sin6->sin6_port);
  694. if (!proto)
  695. proto = inet->inet_num;
  696. else if (proto != inet->inet_num)
  697. return -EINVAL;
  698. if (proto > 255)
  699. return -EINVAL;
  700. daddr = &sin6->sin6_addr;
  701. if (np->sndflow) {
  702. fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
  703. if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
  704. flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
  705. if (IS_ERR(flowlabel))
  706. return -EINVAL;
  707. }
  708. }
  709. /*
  710. * Otherwise it will be difficult to maintain
  711. * sk->sk_dst_cache.
  712. */
  713. if (sk->sk_state == TCP_ESTABLISHED &&
  714. ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
  715. daddr = &sk->sk_v6_daddr;
  716. if (addr_len >= sizeof(struct sockaddr_in6) &&
  717. sin6->sin6_scope_id &&
  718. __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
  719. fl6.flowi6_oif = sin6->sin6_scope_id;
  720. } else {
  721. if (sk->sk_state != TCP_ESTABLISHED)
  722. return -EDESTADDRREQ;
  723. proto = inet->inet_num;
  724. daddr = &sk->sk_v6_daddr;
  725. fl6.flowlabel = np->flow_label;
  726. }
  727. if (fl6.flowi6_oif == 0)
  728. fl6.flowi6_oif = sk->sk_bound_dev_if;
  729. if (msg->msg_controllen) {
  730. opt = &opt_space;
  731. memset(opt, 0, sizeof(struct ipv6_txoptions));
  732. opt->tot_len = sizeof(struct ipv6_txoptions);
  733. ipc6.opt = opt;
  734. err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6);
  735. if (err < 0) {
  736. fl6_sock_release(flowlabel);
  737. return err;
  738. }
  739. if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
  740. flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
  741. if (IS_ERR(flowlabel))
  742. return -EINVAL;
  743. }
  744. if (!(opt->opt_nflen|opt->opt_flen))
  745. opt = NULL;
  746. }
  747. if (!opt) {
  748. opt = txopt_get(np);
  749. opt_to_free = opt;
  750. }
  751. if (flowlabel)
  752. opt = fl6_merge_options(&opt_space, flowlabel, opt);
  753. opt = ipv6_fixup_options(&opt_space, opt);
  754. fl6.flowi6_proto = proto;
  755. fl6.flowi6_mark = ipc6.sockc.mark;
  756. if (!hdrincl) {
  757. rfv.msg = msg;
  758. rfv.hlen = 0;
  759. err = rawv6_probe_proto_opt(&rfv, &fl6);
  760. if (err)
  761. goto out;
  762. }
  763. if (!ipv6_addr_any(daddr))
  764. fl6.daddr = *daddr;
  765. else
  766. fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
  767. if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
  768. fl6.saddr = np->saddr;
  769. final_p = fl6_update_dst(&fl6, opt, &final);
  770. if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
  771. fl6.flowi6_oif = np->mcast_oif;
  772. else if (!fl6.flowi6_oif)
  773. fl6.flowi6_oif = np->ucast_oif;
  774. security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
  775. if (hdrincl)
  776. fl6.flowi6_flags |= FLOWI_FLAG_KNOWN_NH;
  777. if (ipc6.tclass < 0)
  778. ipc6.tclass = np->tclass;
  779. fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
  780. dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
  781. if (IS_ERR(dst)) {
  782. err = PTR_ERR(dst);
  783. goto out;
  784. }
  785. if (ipc6.hlimit < 0)
  786. ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
  787. if (ipc6.dontfrag < 0)
  788. ipc6.dontfrag = np->dontfrag;
  789. if (msg->msg_flags&MSG_CONFIRM)
  790. goto do_confirm;
  791. back_from_confirm:
  792. if (hdrincl)
  793. err = rawv6_send_hdrinc(sk, msg, len, &fl6, &dst,
  794. msg->msg_flags, &ipc6.sockc);
  795. else {
  796. ipc6.opt = opt;
  797. lock_sock(sk);
  798. err = ip6_append_data(sk, raw6_getfrag, &rfv,
  799. len, 0, &ipc6, &fl6, (struct rt6_info *)dst,
  800. msg->msg_flags);
  801. if (err)
  802. ip6_flush_pending_frames(sk);
  803. else if (!(msg->msg_flags & MSG_MORE))
  804. err = rawv6_push_pending_frames(sk, &fl6, rp);
  805. release_sock(sk);
  806. }
  807. done:
  808. dst_release(dst);
  809. out:
  810. fl6_sock_release(flowlabel);
  811. txopt_put(opt_to_free);
  812. return err < 0 ? err : len;
  813. do_confirm:
  814. if (msg->msg_flags & MSG_PROBE)
  815. dst_confirm_neigh(dst, &fl6.daddr);
  816. if (!(msg->msg_flags & MSG_PROBE) || len)
  817. goto back_from_confirm;
  818. err = 0;
  819. goto done;
  820. }
  821. static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
  822. sockptr_t optval, int optlen)
  823. {
  824. switch (optname) {
  825. case ICMPV6_FILTER:
  826. if (optlen > sizeof(struct icmp6_filter))
  827. optlen = sizeof(struct icmp6_filter);
  828. if (copy_from_sockptr(&raw6_sk(sk)->filter, optval, optlen))
  829. return -EFAULT;
  830. return 0;
  831. default:
  832. return -ENOPROTOOPT;
  833. }
  834. return 0;
  835. }
  836. static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
  837. char __user *optval, int __user *optlen)
  838. {
  839. int len;
  840. switch (optname) {
  841. case ICMPV6_FILTER:
  842. if (get_user(len, optlen))
  843. return -EFAULT;
  844. if (len < 0)
  845. return -EINVAL;
  846. if (len > sizeof(struct icmp6_filter))
  847. len = sizeof(struct icmp6_filter);
  848. if (put_user(len, optlen))
  849. return -EFAULT;
  850. if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
  851. return -EFAULT;
  852. return 0;
  853. default:
  854. return -ENOPROTOOPT;
  855. }
  856. return 0;
  857. }
  858. static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
  859. sockptr_t optval, unsigned int optlen)
  860. {
  861. struct raw6_sock *rp = raw6_sk(sk);
  862. int val;
  863. if (optlen < sizeof(val))
  864. return -EINVAL;
  865. if (copy_from_sockptr(&val, optval, sizeof(val)))
  866. return -EFAULT;
  867. switch (optname) {
  868. case IPV6_HDRINCL:
  869. if (sk->sk_type != SOCK_RAW)
  870. return -EINVAL;
  871. inet_sk(sk)->hdrincl = !!val;
  872. return 0;
  873. case IPV6_CHECKSUM:
  874. if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 &&
  875. level == IPPROTO_IPV6) {
  876. /*
  877. * RFC3542 tells that IPV6_CHECKSUM socket
  878. * option in the IPPROTO_IPV6 level is not
  879. * allowed on ICMPv6 sockets.
  880. * If you want to set it, use IPPROTO_RAW
  881. * level IPV6_CHECKSUM socket option
  882. * (Linux extension).
  883. */
  884. return -EINVAL;
  885. }
  886. /* You may get strange result with a positive odd offset;
  887. RFC2292bis agrees with me. */
  888. if (val > 0 && (val&1))
  889. return -EINVAL;
  890. if (val < 0) {
  891. rp->checksum = 0;
  892. } else {
  893. rp->checksum = 1;
  894. rp->offset = val;
  895. }
  896. return 0;
  897. default:
  898. return -ENOPROTOOPT;
  899. }
  900. }
  901. static int rawv6_setsockopt(struct sock *sk, int level, int optname,
  902. sockptr_t optval, unsigned int optlen)
  903. {
  904. switch (level) {
  905. case SOL_RAW:
  906. break;
  907. case SOL_ICMPV6:
  908. if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
  909. return -EOPNOTSUPP;
  910. return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
  911. case SOL_IPV6:
  912. if (optname == IPV6_CHECKSUM ||
  913. optname == IPV6_HDRINCL)
  914. break;
  915. fallthrough;
  916. default:
  917. return ipv6_setsockopt(sk, level, optname, optval, optlen);
  918. }
  919. return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
  920. }
  921. static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
  922. char __user *optval, int __user *optlen)
  923. {
  924. struct raw6_sock *rp = raw6_sk(sk);
  925. int val, len;
  926. if (get_user(len, optlen))
  927. return -EFAULT;
  928. switch (optname) {
  929. case IPV6_HDRINCL:
  930. val = inet_sk(sk)->hdrincl;
  931. break;
  932. case IPV6_CHECKSUM:
  933. /*
  934. * We allow getsockopt() for IPPROTO_IPV6-level
  935. * IPV6_CHECKSUM socket option on ICMPv6 sockets
  936. * since RFC3542 is silent about it.
  937. */
  938. if (rp->checksum == 0)
  939. val = -1;
  940. else
  941. val = rp->offset;
  942. break;
  943. default:
  944. return -ENOPROTOOPT;
  945. }
  946. len = min_t(unsigned int, sizeof(int), len);
  947. if (put_user(len, optlen))
  948. return -EFAULT;
  949. if (copy_to_user(optval, &val, len))
  950. return -EFAULT;
  951. return 0;
  952. }
  953. static int rawv6_getsockopt(struct sock *sk, int level, int optname,
  954. char __user *optval, int __user *optlen)
  955. {
  956. switch (level) {
  957. case SOL_RAW:
  958. break;
  959. case SOL_ICMPV6:
  960. if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
  961. return -EOPNOTSUPP;
  962. return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
  963. case SOL_IPV6:
  964. if (optname == IPV6_CHECKSUM ||
  965. optname == IPV6_HDRINCL)
  966. break;
  967. fallthrough;
  968. default:
  969. return ipv6_getsockopt(sk, level, optname, optval, optlen);
  970. }
  971. return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
  972. }
  973. static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
  974. {
  975. switch (cmd) {
  976. case SIOCOUTQ: {
  977. int amount = sk_wmem_alloc_get(sk);
  978. return put_user(amount, (int __user *)arg);
  979. }
  980. case SIOCINQ: {
  981. struct sk_buff *skb;
  982. int amount = 0;
  983. spin_lock_bh(&sk->sk_receive_queue.lock);
  984. skb = skb_peek(&sk->sk_receive_queue);
  985. if (skb)
  986. amount = skb->len;
  987. spin_unlock_bh(&sk->sk_receive_queue.lock);
  988. return put_user(amount, (int __user *)arg);
  989. }
  990. default:
  991. #ifdef CONFIG_IPV6_MROUTE
  992. return ip6mr_ioctl(sk, cmd, (void __user *)arg);
  993. #else
  994. return -ENOIOCTLCMD;
  995. #endif
  996. }
  997. }
  998. #ifdef CONFIG_COMPAT
  999. static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
  1000. {
  1001. switch (cmd) {
  1002. case SIOCOUTQ:
  1003. case SIOCINQ:
  1004. return -ENOIOCTLCMD;
  1005. default:
  1006. #ifdef CONFIG_IPV6_MROUTE
  1007. return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg));
  1008. #else
  1009. return -ENOIOCTLCMD;
  1010. #endif
  1011. }
  1012. }
  1013. #endif
  1014. static void rawv6_close(struct sock *sk, long timeout)
  1015. {
  1016. if (inet_sk(sk)->inet_num == IPPROTO_RAW)
  1017. ip6_ra_control(sk, -1);
  1018. ip6mr_sk_done(sk);
  1019. sk_common_release(sk);
  1020. }
  1021. static void raw6_destroy(struct sock *sk)
  1022. {
  1023. lock_sock(sk);
  1024. ip6_flush_pending_frames(sk);
  1025. release_sock(sk);
  1026. inet6_destroy_sock(sk);
  1027. }
  1028. static int rawv6_init_sk(struct sock *sk)
  1029. {
  1030. struct raw6_sock *rp = raw6_sk(sk);
  1031. switch (inet_sk(sk)->inet_num) {
  1032. case IPPROTO_ICMPV6:
  1033. rp->checksum = 1;
  1034. rp->offset = 2;
  1035. break;
  1036. case IPPROTO_MH:
  1037. rp->checksum = 1;
  1038. rp->offset = 4;
  1039. break;
  1040. default:
  1041. break;
  1042. }
  1043. return 0;
  1044. }
  1045. struct proto rawv6_prot = {
  1046. .name = "RAWv6",
  1047. .owner = THIS_MODULE,
  1048. .close = rawv6_close,
  1049. .destroy = raw6_destroy,
  1050. .connect = ip6_datagram_connect_v6_only,
  1051. .disconnect = __udp_disconnect,
  1052. .ioctl = rawv6_ioctl,
  1053. .init = rawv6_init_sk,
  1054. .setsockopt = rawv6_setsockopt,
  1055. .getsockopt = rawv6_getsockopt,
  1056. .sendmsg = rawv6_sendmsg,
  1057. .recvmsg = rawv6_recvmsg,
  1058. .bind = rawv6_bind,
  1059. .backlog_rcv = rawv6_rcv_skb,
  1060. .hash = raw_hash_sk,
  1061. .unhash = raw_unhash_sk,
  1062. .obj_size = sizeof(struct raw6_sock),
  1063. .useroffset = offsetof(struct raw6_sock, filter),
  1064. .usersize = sizeof_field(struct raw6_sock, filter),
  1065. .h.raw_hash = &raw_v6_hashinfo,
  1066. #ifdef CONFIG_COMPAT
  1067. .compat_ioctl = compat_rawv6_ioctl,
  1068. #endif
  1069. .diag_destroy = raw_abort,
  1070. };
  1071. #ifdef CONFIG_PROC_FS
  1072. static int raw6_seq_show(struct seq_file *seq, void *v)
  1073. {
  1074. if (v == SEQ_START_TOKEN) {
  1075. seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
  1076. } else {
  1077. struct sock *sp = v;
  1078. __u16 srcp = inet_sk(sp)->inet_num;
  1079. ip6_dgram_sock_seq_show(seq, v, srcp, 0,
  1080. raw_seq_private(seq)->bucket);
  1081. }
  1082. return 0;
  1083. }
  1084. static const struct seq_operations raw6_seq_ops = {
  1085. .start = raw_seq_start,
  1086. .next = raw_seq_next,
  1087. .stop = raw_seq_stop,
  1088. .show = raw6_seq_show,
  1089. };
  1090. static int __net_init raw6_init_net(struct net *net)
  1091. {
  1092. if (!proc_create_net_data("raw6", 0444, net->proc_net, &raw6_seq_ops,
  1093. sizeof(struct raw_iter_state), &raw_v6_hashinfo))
  1094. return -ENOMEM;
  1095. return 0;
  1096. }
  1097. static void __net_exit raw6_exit_net(struct net *net)
  1098. {
  1099. remove_proc_entry("raw6", net->proc_net);
  1100. }
  1101. static struct pernet_operations raw6_net_ops = {
  1102. .init = raw6_init_net,
  1103. .exit = raw6_exit_net,
  1104. };
  1105. int __init raw6_proc_init(void)
  1106. {
  1107. return register_pernet_subsys(&raw6_net_ops);
  1108. }
  1109. void raw6_proc_exit(void)
  1110. {
  1111. unregister_pernet_subsys(&raw6_net_ops);
  1112. }
  1113. #endif /* CONFIG_PROC_FS */
  1114. /* Same as inet6_dgram_ops, sans udp_poll. */
  1115. const struct proto_ops inet6_sockraw_ops = {
  1116. .family = PF_INET6,
  1117. .owner = THIS_MODULE,
  1118. .release = inet6_release,
  1119. .bind = inet6_bind,
  1120. .connect = inet_dgram_connect, /* ok */
  1121. .socketpair = sock_no_socketpair, /* a do nothing */
  1122. .accept = sock_no_accept, /* a do nothing */
  1123. .getname = inet6_getname,
  1124. .poll = datagram_poll, /* ok */
  1125. .ioctl = inet6_ioctl, /* must change */
  1126. .gettstamp = sock_gettstamp,
  1127. .listen = sock_no_listen, /* ok */
  1128. .shutdown = inet_shutdown, /* ok */
  1129. .setsockopt = sock_common_setsockopt, /* ok */
  1130. .getsockopt = sock_common_getsockopt, /* ok */
  1131. .sendmsg = inet_sendmsg, /* ok */
  1132. .recvmsg = sock_common_recvmsg, /* ok */
  1133. .mmap = sock_no_mmap,
  1134. .sendpage = sock_no_sendpage,
  1135. #ifdef CONFIG_COMPAT
  1136. .compat_ioctl = inet6_compat_ioctl,
  1137. #endif
  1138. };
  1139. static struct inet_protosw rawv6_protosw = {
  1140. .type = SOCK_RAW,
  1141. .protocol = IPPROTO_IP, /* wild card */
  1142. .prot = &rawv6_prot,
  1143. .ops = &inet6_sockraw_ops,
  1144. .flags = INET_PROTOSW_REUSE,
  1145. };
  1146. int __init rawv6_init(void)
  1147. {
  1148. return inet6_register_protosw(&rawv6_protosw);
  1149. }
  1150. void rawv6_exit(void)
  1151. {
  1152. inet6_unregister_protosw(&rawv6_protosw);
  1153. }