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 <[email protected]>
  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. EXPORT_SYMBOL_GPL(raw_v6_hashinfo);
  59. bool raw_v6_match(struct net *net, struct sock *sk, unsigned short num,
  60. const struct in6_addr *loc_addr,
  61. const struct in6_addr *rmt_addr, int dif, int sdif)
  62. {
  63. if (inet_sk(sk)->inet_num != num ||
  64. !net_eq(sock_net(sk), net) ||
  65. (!ipv6_addr_any(&sk->sk_v6_daddr) &&
  66. !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
  67. !raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if,
  68. dif, sdif))
  69. return false;
  70. if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) ||
  71. ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr) ||
  72. (ipv6_addr_is_multicast(loc_addr) &&
  73. inet6_mc_check(sk, loc_addr, rmt_addr)))
  74. return true;
  75. return false;
  76. }
  77. EXPORT_SYMBOL_GPL(raw_v6_match);
  78. /*
  79. * 0 - deliver
  80. * 1 - block
  81. */
  82. static int icmpv6_filter(const struct sock *sk, const struct sk_buff *skb)
  83. {
  84. struct icmp6hdr _hdr;
  85. const struct icmp6hdr *hdr;
  86. /* We require only the four bytes of the ICMPv6 header, not any
  87. * additional bytes of message body in "struct icmp6hdr".
  88. */
  89. hdr = skb_header_pointer(skb, skb_transport_offset(skb),
  90. ICMPV6_HDRLEN, &_hdr);
  91. if (hdr) {
  92. const __u32 *data = &raw6_sk(sk)->filter.data[0];
  93. unsigned int type = hdr->icmp6_type;
  94. return (data[type >> 5] & (1U << (type & 31))) != 0;
  95. }
  96. return 1;
  97. }
  98. #if IS_ENABLED(CONFIG_IPV6_MIP6)
  99. typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb);
  100. static mh_filter_t __rcu *mh_filter __read_mostly;
  101. int rawv6_mh_filter_register(mh_filter_t filter)
  102. {
  103. rcu_assign_pointer(mh_filter, filter);
  104. return 0;
  105. }
  106. EXPORT_SYMBOL(rawv6_mh_filter_register);
  107. int rawv6_mh_filter_unregister(mh_filter_t filter)
  108. {
  109. RCU_INIT_POINTER(mh_filter, NULL);
  110. synchronize_rcu();
  111. return 0;
  112. }
  113. EXPORT_SYMBOL(rawv6_mh_filter_unregister);
  114. #endif
  115. /*
  116. * demultiplex raw sockets.
  117. * (should consider queueing the skb in the sock receive_queue
  118. * without calling rawv6.c)
  119. *
  120. * Caller owns SKB so we must make clones.
  121. */
  122. static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
  123. {
  124. struct net *net = dev_net(skb->dev);
  125. const struct in6_addr *saddr;
  126. const struct in6_addr *daddr;
  127. struct hlist_head *hlist;
  128. struct sock *sk;
  129. bool delivered = false;
  130. __u8 hash;
  131. saddr = &ipv6_hdr(skb)->saddr;
  132. daddr = saddr + 1;
  133. hash = raw_hashfunc(net, nexthdr);
  134. hlist = &raw_v6_hashinfo.ht[hash];
  135. rcu_read_lock();
  136. sk_for_each_rcu(sk, hlist) {
  137. int filtered;
  138. if (!raw_v6_match(net, sk, nexthdr, daddr, saddr,
  139. inet6_iif(skb), inet6_sdif(skb)))
  140. continue;
  141. delivered = true;
  142. switch (nexthdr) {
  143. case IPPROTO_ICMPV6:
  144. filtered = icmpv6_filter(sk, skb);
  145. break;
  146. #if IS_ENABLED(CONFIG_IPV6_MIP6)
  147. case IPPROTO_MH:
  148. {
  149. /* XXX: To validate MH only once for each packet,
  150. * this is placed here. It should be after checking
  151. * xfrm policy, however it doesn't. The checking xfrm
  152. * policy is placed in rawv6_rcv() because it is
  153. * required for each socket.
  154. */
  155. mh_filter_t *filter;
  156. filter = rcu_dereference(mh_filter);
  157. filtered = filter ? (*filter)(sk, skb) : 0;
  158. break;
  159. }
  160. #endif
  161. default:
  162. filtered = 0;
  163. break;
  164. }
  165. if (filtered < 0)
  166. break;
  167. if (filtered == 0) {
  168. struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
  169. /* Not releasing hash table! */
  170. if (clone)
  171. rawv6_rcv(sk, clone);
  172. }
  173. }
  174. rcu_read_unlock();
  175. return delivered;
  176. }
  177. bool raw6_local_deliver(struct sk_buff *skb, int nexthdr)
  178. {
  179. return ipv6_raw_deliver(skb, nexthdr);
  180. }
  181. /* This cleans up af_inet6 a bit. -DaveM */
  182. static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
  183. {
  184. struct inet_sock *inet = inet_sk(sk);
  185. struct ipv6_pinfo *np = inet6_sk(sk);
  186. struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
  187. __be32 v4addr = 0;
  188. int addr_type;
  189. int err;
  190. if (addr_len < SIN6_LEN_RFC2133)
  191. return -EINVAL;
  192. if (addr->sin6_family != AF_INET6)
  193. return -EINVAL;
  194. addr_type = ipv6_addr_type(&addr->sin6_addr);
  195. /* Raw sockets are IPv6 only */
  196. if (addr_type == IPV6_ADDR_MAPPED)
  197. return -EADDRNOTAVAIL;
  198. lock_sock(sk);
  199. err = -EINVAL;
  200. if (sk->sk_state != TCP_CLOSE)
  201. goto out;
  202. rcu_read_lock();
  203. /* Check if the address belongs to the host. */
  204. if (addr_type != IPV6_ADDR_ANY) {
  205. struct net_device *dev = NULL;
  206. if (__ipv6_addr_needs_scope_id(addr_type)) {
  207. if (addr_len >= sizeof(struct sockaddr_in6) &&
  208. addr->sin6_scope_id) {
  209. /* Override any existing binding, if another
  210. * one is supplied by user.
  211. */
  212. sk->sk_bound_dev_if = addr->sin6_scope_id;
  213. }
  214. /* Binding to link-local address requires an interface */
  215. if (!sk->sk_bound_dev_if)
  216. goto out_unlock;
  217. }
  218. if (sk->sk_bound_dev_if) {
  219. err = -ENODEV;
  220. dev = dev_get_by_index_rcu(sock_net(sk),
  221. sk->sk_bound_dev_if);
  222. if (!dev)
  223. goto out_unlock;
  224. }
  225. /* ipv4 addr of the socket is invalid. Only the
  226. * unspecified and mapped address have a v4 equivalent.
  227. */
  228. v4addr = LOOPBACK4_IPV6;
  229. if (!(addr_type & IPV6_ADDR_MULTICAST) &&
  230. !ipv6_can_nonlocal_bind(sock_net(sk), inet)) {
  231. err = -EADDRNOTAVAIL;
  232. if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr,
  233. dev, 0)) {
  234. goto out_unlock;
  235. }
  236. }
  237. }
  238. inet->inet_rcv_saddr = inet->inet_saddr = v4addr;
  239. sk->sk_v6_rcv_saddr = addr->sin6_addr;
  240. if (!(addr_type & IPV6_ADDR_MULTICAST))
  241. np->saddr = addr->sin6_addr;
  242. err = 0;
  243. out_unlock:
  244. rcu_read_unlock();
  245. out:
  246. release_sock(sk);
  247. return err;
  248. }
  249. static void rawv6_err(struct sock *sk, struct sk_buff *skb,
  250. struct inet6_skb_parm *opt,
  251. u8 type, u8 code, int offset, __be32 info)
  252. {
  253. struct inet_sock *inet = inet_sk(sk);
  254. struct ipv6_pinfo *np = inet6_sk(sk);
  255. int err;
  256. int harderr;
  257. /* Report error on raw socket, if:
  258. 1. User requested recverr.
  259. 2. Socket is connected (otherwise the error indication
  260. is useless without recverr and error is hard.
  261. */
  262. if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
  263. return;
  264. harderr = icmpv6_err_convert(type, code, &err);
  265. if (type == ICMPV6_PKT_TOOBIG) {
  266. ip6_sk_update_pmtu(skb, sk, info);
  267. harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
  268. }
  269. if (type == NDISC_REDIRECT) {
  270. ip6_sk_redirect(skb, sk);
  271. return;
  272. }
  273. if (np->recverr) {
  274. u8 *payload = skb->data;
  275. if (!inet->hdrincl)
  276. payload += offset;
  277. ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
  278. }
  279. if (np->recverr || harderr) {
  280. sk->sk_err = err;
  281. sk_error_report(sk);
  282. }
  283. }
  284. void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
  285. u8 type, u8 code, int inner_offset, __be32 info)
  286. {
  287. struct net *net = dev_net(skb->dev);
  288. struct hlist_head *hlist;
  289. struct sock *sk;
  290. int hash;
  291. hash = raw_hashfunc(net, nexthdr);
  292. hlist = &raw_v6_hashinfo.ht[hash];
  293. rcu_read_lock();
  294. sk_for_each_rcu(sk, hlist) {
  295. /* Note: ipv6_hdr(skb) != skb->data */
  296. const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data;
  297. if (!raw_v6_match(net, sk, nexthdr, &ip6h->saddr, &ip6h->daddr,
  298. inet6_iif(skb), inet6_iif(skb)))
  299. continue;
  300. rawv6_err(sk, skb, NULL, type, code, inner_offset, info);
  301. }
  302. rcu_read_unlock();
  303. }
  304. static inline int rawv6_rcv_skb(struct sock *sk, struct sk_buff *skb)
  305. {
  306. if ((raw6_sk(sk)->checksum || rcu_access_pointer(sk->sk_filter)) &&
  307. skb_checksum_complete(skb)) {
  308. atomic_inc(&sk->sk_drops);
  309. kfree_skb(skb);
  310. return NET_RX_DROP;
  311. }
  312. /* Charge it to the socket. */
  313. skb_dst_drop(skb);
  314. if (sock_queue_rcv_skb(sk, skb) < 0) {
  315. kfree_skb(skb);
  316. return NET_RX_DROP;
  317. }
  318. return 0;
  319. }
  320. /*
  321. * This is next to useless...
  322. * if we demultiplex in network layer we don't need the extra call
  323. * just to queue the skb...
  324. * maybe we could have the network decide upon a hint if it
  325. * should call raw_rcv for demultiplexing
  326. */
  327. int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
  328. {
  329. struct inet_sock *inet = inet_sk(sk);
  330. struct raw6_sock *rp = raw6_sk(sk);
  331. if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
  332. atomic_inc(&sk->sk_drops);
  333. kfree_skb(skb);
  334. return NET_RX_DROP;
  335. }
  336. nf_reset_ct(skb);
  337. if (!rp->checksum)
  338. skb->ip_summed = CHECKSUM_UNNECESSARY;
  339. if (skb->ip_summed == CHECKSUM_COMPLETE) {
  340. skb_postpull_rcsum(skb, skb_network_header(skb),
  341. skb_network_header_len(skb));
  342. if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
  343. &ipv6_hdr(skb)->daddr,
  344. skb->len, inet->inet_num, skb->csum))
  345. skb->ip_summed = CHECKSUM_UNNECESSARY;
  346. }
  347. if (!skb_csum_unnecessary(skb))
  348. skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
  349. &ipv6_hdr(skb)->daddr,
  350. skb->len,
  351. inet->inet_num, 0));
  352. if (inet->hdrincl) {
  353. if (skb_checksum_complete(skb)) {
  354. atomic_inc(&sk->sk_drops);
  355. kfree_skb(skb);
  356. return NET_RX_DROP;
  357. }
  358. }
  359. rawv6_rcv_skb(sk, skb);
  360. return 0;
  361. }
  362. /*
  363. * This should be easy, if there is something there
  364. * we return it, otherwise we block.
  365. */
  366. static int rawv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
  367. int flags, int *addr_len)
  368. {
  369. struct ipv6_pinfo *np = inet6_sk(sk);
  370. DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
  371. struct sk_buff *skb;
  372. size_t copied;
  373. int err;
  374. if (flags & MSG_OOB)
  375. return -EOPNOTSUPP;
  376. if (flags & MSG_ERRQUEUE)
  377. return ipv6_recv_error(sk, msg, len, addr_len);
  378. if (np->rxpmtu && np->rxopt.bits.rxpmtu)
  379. return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
  380. skb = skb_recv_datagram(sk, flags, &err);
  381. if (!skb)
  382. goto out;
  383. copied = skb->len;
  384. if (copied > len) {
  385. copied = len;
  386. msg->msg_flags |= MSG_TRUNC;
  387. }
  388. if (skb_csum_unnecessary(skb)) {
  389. err = skb_copy_datagram_msg(skb, 0, msg, copied);
  390. } else if (msg->msg_flags&MSG_TRUNC) {
  391. if (__skb_checksum_complete(skb))
  392. goto csum_copy_err;
  393. err = skb_copy_datagram_msg(skb, 0, msg, copied);
  394. } else {
  395. err = skb_copy_and_csum_datagram_msg(skb, 0, msg);
  396. if (err == -EINVAL)
  397. goto csum_copy_err;
  398. }
  399. if (err)
  400. goto out_free;
  401. /* Copy the address. */
  402. if (sin6) {
  403. sin6->sin6_family = AF_INET6;
  404. sin6->sin6_port = 0;
  405. sin6->sin6_addr = ipv6_hdr(skb)->saddr;
  406. sin6->sin6_flowinfo = 0;
  407. sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
  408. inet6_iif(skb));
  409. *addr_len = sizeof(*sin6);
  410. }
  411. sock_recv_cmsgs(msg, sk, skb);
  412. if (np->rxopt.all)
  413. ip6_datagram_recv_ctl(sk, msg, skb);
  414. err = copied;
  415. if (flags & MSG_TRUNC)
  416. err = skb->len;
  417. out_free:
  418. skb_free_datagram(sk, skb);
  419. out:
  420. return err;
  421. csum_copy_err:
  422. skb_kill_datagram(sk, skb, flags);
  423. /* Error for blocking case is chosen to masquerade
  424. as some normal condition.
  425. */
  426. err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
  427. goto out;
  428. }
  429. static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
  430. struct raw6_sock *rp)
  431. {
  432. struct ipv6_txoptions *opt;
  433. struct sk_buff *skb;
  434. int err = 0;
  435. int offset;
  436. int len;
  437. int total_len;
  438. __wsum tmp_csum;
  439. __sum16 csum;
  440. if (!rp->checksum)
  441. goto send;
  442. skb = skb_peek(&sk->sk_write_queue);
  443. if (!skb)
  444. goto out;
  445. offset = rp->offset;
  446. total_len = inet_sk(sk)->cork.base.length;
  447. opt = inet6_sk(sk)->cork.opt;
  448. total_len -= opt ? opt->opt_flen : 0;
  449. if (offset >= total_len - 1) {
  450. err = -EINVAL;
  451. ip6_flush_pending_frames(sk);
  452. goto out;
  453. }
  454. /* should be check HW csum miyazawa */
  455. if (skb_queue_len(&sk->sk_write_queue) == 1) {
  456. /*
  457. * Only one fragment on the socket.
  458. */
  459. tmp_csum = skb->csum;
  460. } else {
  461. struct sk_buff *csum_skb = NULL;
  462. tmp_csum = 0;
  463. skb_queue_walk(&sk->sk_write_queue, skb) {
  464. tmp_csum = csum_add(tmp_csum, skb->csum);
  465. if (csum_skb)
  466. continue;
  467. len = skb->len - skb_transport_offset(skb);
  468. if (offset >= len) {
  469. offset -= len;
  470. continue;
  471. }
  472. csum_skb = skb;
  473. }
  474. skb = csum_skb;
  475. }
  476. offset += skb_transport_offset(skb);
  477. err = skb_copy_bits(skb, offset, &csum, 2);
  478. if (err < 0) {
  479. ip6_flush_pending_frames(sk);
  480. goto out;
  481. }
  482. /* in case cksum was not initialized */
  483. if (unlikely(csum))
  484. tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
  485. csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
  486. total_len, fl6->flowi6_proto, tmp_csum);
  487. if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP)
  488. csum = CSUM_MANGLED_0;
  489. BUG_ON(skb_store_bits(skb, offset, &csum, 2));
  490. send:
  491. err = ip6_push_pending_frames(sk);
  492. out:
  493. return err;
  494. }
  495. static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
  496. struct flowi6 *fl6, struct dst_entry **dstp,
  497. unsigned int flags, const struct sockcm_cookie *sockc)
  498. {
  499. struct ipv6_pinfo *np = inet6_sk(sk);
  500. struct net *net = sock_net(sk);
  501. struct ipv6hdr *iph;
  502. struct sk_buff *skb;
  503. int err;
  504. struct rt6_info *rt = (struct rt6_info *)*dstp;
  505. int hlen = LL_RESERVED_SPACE(rt->dst.dev);
  506. int tlen = rt->dst.dev->needed_tailroom;
  507. if (length > rt->dst.dev->mtu) {
  508. ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu);
  509. return -EMSGSIZE;
  510. }
  511. if (length < sizeof(struct ipv6hdr))
  512. return -EINVAL;
  513. if (flags&MSG_PROBE)
  514. goto out;
  515. skb = sock_alloc_send_skb(sk,
  516. length + hlen + tlen + 15,
  517. flags & MSG_DONTWAIT, &err);
  518. if (!skb)
  519. goto error;
  520. skb_reserve(skb, hlen);
  521. skb->protocol = htons(ETH_P_IPV6);
  522. skb->priority = READ_ONCE(sk->sk_priority);
  523. skb->mark = sockc->mark;
  524. skb->tstamp = sockc->transmit_time;
  525. skb_put(skb, length);
  526. skb_reset_network_header(skb);
  527. iph = ipv6_hdr(skb);
  528. skb->ip_summed = CHECKSUM_NONE;
  529. skb_setup_tx_timestamp(skb, sockc->tsflags);
  530. if (flags & MSG_CONFIRM)
  531. skb_set_dst_pending_confirm(skb, 1);
  532. skb->transport_header = skb->network_header;
  533. err = memcpy_from_msg(iph, msg, length);
  534. if (err) {
  535. err = -EFAULT;
  536. kfree_skb(skb);
  537. goto error;
  538. }
  539. skb_dst_set(skb, &rt->dst);
  540. *dstp = NULL;
  541. /* if egress device is enslaved to an L3 master device pass the
  542. * skb to its handler for processing
  543. */
  544. skb = l3mdev_ip6_out(sk, skb);
  545. if (unlikely(!skb))
  546. return 0;
  547. /* Acquire rcu_read_lock() in case we need to use rt->rt6i_idev
  548. * in the error path. Since skb has been freed, the dst could
  549. * have been queued for deletion.
  550. */
  551. rcu_read_lock();
  552. IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
  553. err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, skb,
  554. NULL, rt->dst.dev, dst_output);
  555. if (err > 0)
  556. err = net_xmit_errno(err);
  557. if (err) {
  558. IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
  559. rcu_read_unlock();
  560. goto error_check;
  561. }
  562. rcu_read_unlock();
  563. out:
  564. return 0;
  565. error:
  566. IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
  567. error_check:
  568. if (err == -ENOBUFS && !np->recverr)
  569. err = 0;
  570. return err;
  571. }
  572. struct raw6_frag_vec {
  573. struct msghdr *msg;
  574. int hlen;
  575. char c[4];
  576. };
  577. static int rawv6_probe_proto_opt(struct raw6_frag_vec *rfv, struct flowi6 *fl6)
  578. {
  579. int err = 0;
  580. switch (fl6->flowi6_proto) {
  581. case IPPROTO_ICMPV6:
  582. rfv->hlen = 2;
  583. err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
  584. if (!err) {
  585. fl6->fl6_icmp_type = rfv->c[0];
  586. fl6->fl6_icmp_code = rfv->c[1];
  587. }
  588. break;
  589. case IPPROTO_MH:
  590. rfv->hlen = 4;
  591. err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
  592. if (!err)
  593. fl6->fl6_mh_type = rfv->c[2];
  594. }
  595. return err;
  596. }
  597. static int raw6_getfrag(void *from, char *to, int offset, int len, int odd,
  598. struct sk_buff *skb)
  599. {
  600. struct raw6_frag_vec *rfv = from;
  601. if (offset < rfv->hlen) {
  602. int copy = min(rfv->hlen - offset, len);
  603. if (skb->ip_summed == CHECKSUM_PARTIAL)
  604. memcpy(to, rfv->c + offset, copy);
  605. else
  606. skb->csum = csum_block_add(
  607. skb->csum,
  608. csum_partial_copy_nocheck(rfv->c + offset,
  609. to, copy),
  610. odd);
  611. odd = 0;
  612. offset += copy;
  613. to += copy;
  614. len -= copy;
  615. if (!len)
  616. return 0;
  617. }
  618. offset -= rfv->hlen;
  619. return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
  620. }
  621. static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
  622. {
  623. struct ipv6_txoptions *opt_to_free = NULL;
  624. struct ipv6_txoptions opt_space;
  625. DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
  626. struct in6_addr *daddr, *final_p, final;
  627. struct inet_sock *inet = inet_sk(sk);
  628. struct ipv6_pinfo *np = inet6_sk(sk);
  629. struct raw6_sock *rp = raw6_sk(sk);
  630. struct ipv6_txoptions *opt = NULL;
  631. struct ip6_flowlabel *flowlabel = NULL;
  632. struct dst_entry *dst = NULL;
  633. struct raw6_frag_vec rfv;
  634. struct flowi6 fl6;
  635. struct ipcm6_cookie ipc6;
  636. int addr_len = msg->msg_namelen;
  637. int hdrincl;
  638. u16 proto;
  639. int err;
  640. /* Rough check on arithmetic overflow,
  641. better check is made in ip6_append_data().
  642. */
  643. if (len > INT_MAX)
  644. return -EMSGSIZE;
  645. /* Mirror BSD error message compatibility */
  646. if (msg->msg_flags & MSG_OOB)
  647. return -EOPNOTSUPP;
  648. /* hdrincl should be READ_ONCE(inet->hdrincl)
  649. * but READ_ONCE() doesn't work with bit fields.
  650. * Doing this indirectly yields the same result.
  651. */
  652. hdrincl = inet->hdrincl;
  653. hdrincl = READ_ONCE(hdrincl);
  654. /*
  655. * Get and verify the address.
  656. */
  657. memset(&fl6, 0, sizeof(fl6));
  658. fl6.flowi6_mark = READ_ONCE(sk->sk_mark);
  659. fl6.flowi6_uid = sk->sk_uid;
  660. ipcm6_init(&ipc6);
  661. ipc6.sockc.tsflags = sk->sk_tsflags;
  662. ipc6.sockc.mark = fl6.flowi6_mark;
  663. if (sin6) {
  664. if (addr_len < SIN6_LEN_RFC2133)
  665. return -EINVAL;
  666. if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
  667. return -EAFNOSUPPORT;
  668. /* port is the proto value [0..255] carried in nexthdr */
  669. proto = ntohs(sin6->sin6_port);
  670. if (!proto)
  671. proto = inet->inet_num;
  672. else if (proto != inet->inet_num &&
  673. inet->inet_num != IPPROTO_RAW)
  674. return -EINVAL;
  675. if (proto > 255)
  676. return -EINVAL;
  677. daddr = &sin6->sin6_addr;
  678. if (np->sndflow) {
  679. fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
  680. if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
  681. flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
  682. if (IS_ERR(flowlabel))
  683. return -EINVAL;
  684. }
  685. }
  686. /*
  687. * Otherwise it will be difficult to maintain
  688. * sk->sk_dst_cache.
  689. */
  690. if (sk->sk_state == TCP_ESTABLISHED &&
  691. ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
  692. daddr = &sk->sk_v6_daddr;
  693. if (addr_len >= sizeof(struct sockaddr_in6) &&
  694. sin6->sin6_scope_id &&
  695. __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
  696. fl6.flowi6_oif = sin6->sin6_scope_id;
  697. } else {
  698. if (sk->sk_state != TCP_ESTABLISHED)
  699. return -EDESTADDRREQ;
  700. proto = inet->inet_num;
  701. daddr = &sk->sk_v6_daddr;
  702. fl6.flowlabel = np->flow_label;
  703. }
  704. if (fl6.flowi6_oif == 0)
  705. fl6.flowi6_oif = sk->sk_bound_dev_if;
  706. if (msg->msg_controllen) {
  707. opt = &opt_space;
  708. memset(opt, 0, sizeof(struct ipv6_txoptions));
  709. opt->tot_len = sizeof(struct ipv6_txoptions);
  710. ipc6.opt = opt;
  711. err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6);
  712. if (err < 0) {
  713. fl6_sock_release(flowlabel);
  714. return err;
  715. }
  716. if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
  717. flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
  718. if (IS_ERR(flowlabel))
  719. return -EINVAL;
  720. }
  721. if (!(opt->opt_nflen|opt->opt_flen))
  722. opt = NULL;
  723. }
  724. if (!opt) {
  725. opt = txopt_get(np);
  726. opt_to_free = opt;
  727. }
  728. if (flowlabel)
  729. opt = fl6_merge_options(&opt_space, flowlabel, opt);
  730. opt = ipv6_fixup_options(&opt_space, opt);
  731. fl6.flowi6_proto = proto;
  732. fl6.flowi6_mark = ipc6.sockc.mark;
  733. if (!hdrincl) {
  734. rfv.msg = msg;
  735. rfv.hlen = 0;
  736. err = rawv6_probe_proto_opt(&rfv, &fl6);
  737. if (err)
  738. goto out;
  739. }
  740. if (!ipv6_addr_any(daddr))
  741. fl6.daddr = *daddr;
  742. else
  743. fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
  744. if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
  745. fl6.saddr = np->saddr;
  746. final_p = fl6_update_dst(&fl6, opt, &final);
  747. if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
  748. fl6.flowi6_oif = np->mcast_oif;
  749. else if (!fl6.flowi6_oif)
  750. fl6.flowi6_oif = np->ucast_oif;
  751. security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
  752. if (hdrincl)
  753. fl6.flowi6_flags |= FLOWI_FLAG_KNOWN_NH;
  754. if (ipc6.tclass < 0)
  755. ipc6.tclass = np->tclass;
  756. fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
  757. dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
  758. if (IS_ERR(dst)) {
  759. err = PTR_ERR(dst);
  760. goto out;
  761. }
  762. if (ipc6.hlimit < 0)
  763. ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
  764. if (ipc6.dontfrag < 0)
  765. ipc6.dontfrag = np->dontfrag;
  766. if (msg->msg_flags&MSG_CONFIRM)
  767. goto do_confirm;
  768. back_from_confirm:
  769. if (hdrincl)
  770. err = rawv6_send_hdrinc(sk, msg, len, &fl6, &dst,
  771. msg->msg_flags, &ipc6.sockc);
  772. else {
  773. ipc6.opt = opt;
  774. lock_sock(sk);
  775. err = ip6_append_data(sk, raw6_getfrag, &rfv,
  776. len, 0, &ipc6, &fl6, (struct rt6_info *)dst,
  777. msg->msg_flags);
  778. if (err)
  779. ip6_flush_pending_frames(sk);
  780. else if (!(msg->msg_flags & MSG_MORE))
  781. err = rawv6_push_pending_frames(sk, &fl6, rp);
  782. release_sock(sk);
  783. }
  784. done:
  785. dst_release(dst);
  786. out:
  787. fl6_sock_release(flowlabel);
  788. txopt_put(opt_to_free);
  789. return err < 0 ? err : len;
  790. do_confirm:
  791. if (msg->msg_flags & MSG_PROBE)
  792. dst_confirm_neigh(dst, &fl6.daddr);
  793. if (!(msg->msg_flags & MSG_PROBE) || len)
  794. goto back_from_confirm;
  795. err = 0;
  796. goto done;
  797. }
  798. static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
  799. sockptr_t optval, int optlen)
  800. {
  801. switch (optname) {
  802. case ICMPV6_FILTER:
  803. if (optlen > sizeof(struct icmp6_filter))
  804. optlen = sizeof(struct icmp6_filter);
  805. if (copy_from_sockptr(&raw6_sk(sk)->filter, optval, optlen))
  806. return -EFAULT;
  807. return 0;
  808. default:
  809. return -ENOPROTOOPT;
  810. }
  811. return 0;
  812. }
  813. static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
  814. char __user *optval, int __user *optlen)
  815. {
  816. int len;
  817. switch (optname) {
  818. case ICMPV6_FILTER:
  819. if (get_user(len, optlen))
  820. return -EFAULT;
  821. if (len < 0)
  822. return -EINVAL;
  823. if (len > sizeof(struct icmp6_filter))
  824. len = sizeof(struct icmp6_filter);
  825. if (put_user(len, optlen))
  826. return -EFAULT;
  827. if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
  828. return -EFAULT;
  829. return 0;
  830. default:
  831. return -ENOPROTOOPT;
  832. }
  833. return 0;
  834. }
  835. static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
  836. sockptr_t optval, unsigned int optlen)
  837. {
  838. struct raw6_sock *rp = raw6_sk(sk);
  839. int val;
  840. if (optlen < sizeof(val))
  841. return -EINVAL;
  842. if (copy_from_sockptr(&val, optval, sizeof(val)))
  843. return -EFAULT;
  844. switch (optname) {
  845. case IPV6_HDRINCL:
  846. if (sk->sk_type != SOCK_RAW)
  847. return -EINVAL;
  848. inet_sk(sk)->hdrincl = !!val;
  849. return 0;
  850. case IPV6_CHECKSUM:
  851. if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 &&
  852. level == IPPROTO_IPV6) {
  853. /*
  854. * RFC3542 tells that IPV6_CHECKSUM socket
  855. * option in the IPPROTO_IPV6 level is not
  856. * allowed on ICMPv6 sockets.
  857. * If you want to set it, use IPPROTO_RAW
  858. * level IPV6_CHECKSUM socket option
  859. * (Linux extension).
  860. */
  861. return -EINVAL;
  862. }
  863. /* You may get strange result with a positive odd offset;
  864. RFC2292bis agrees with me. */
  865. if (val > 0 && (val&1))
  866. return -EINVAL;
  867. if (val < 0) {
  868. rp->checksum = 0;
  869. } else {
  870. rp->checksum = 1;
  871. rp->offset = val;
  872. }
  873. return 0;
  874. default:
  875. return -ENOPROTOOPT;
  876. }
  877. }
  878. static int rawv6_setsockopt(struct sock *sk, int level, int optname,
  879. sockptr_t optval, unsigned int optlen)
  880. {
  881. switch (level) {
  882. case SOL_RAW:
  883. break;
  884. case SOL_ICMPV6:
  885. if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
  886. return -EOPNOTSUPP;
  887. return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
  888. case SOL_IPV6:
  889. if (optname == IPV6_CHECKSUM ||
  890. optname == IPV6_HDRINCL)
  891. break;
  892. fallthrough;
  893. default:
  894. return ipv6_setsockopt(sk, level, optname, optval, optlen);
  895. }
  896. return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
  897. }
  898. static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
  899. char __user *optval, int __user *optlen)
  900. {
  901. struct raw6_sock *rp = raw6_sk(sk);
  902. int val, len;
  903. if (get_user(len, optlen))
  904. return -EFAULT;
  905. switch (optname) {
  906. case IPV6_HDRINCL:
  907. val = inet_sk(sk)->hdrincl;
  908. break;
  909. case IPV6_CHECKSUM:
  910. /*
  911. * We allow getsockopt() for IPPROTO_IPV6-level
  912. * IPV6_CHECKSUM socket option on ICMPv6 sockets
  913. * since RFC3542 is silent about it.
  914. */
  915. if (rp->checksum == 0)
  916. val = -1;
  917. else
  918. val = rp->offset;
  919. break;
  920. default:
  921. return -ENOPROTOOPT;
  922. }
  923. len = min_t(unsigned int, sizeof(int), len);
  924. if (put_user(len, optlen))
  925. return -EFAULT;
  926. if (copy_to_user(optval, &val, len))
  927. return -EFAULT;
  928. return 0;
  929. }
  930. static int rawv6_getsockopt(struct sock *sk, int level, int optname,
  931. char __user *optval, int __user *optlen)
  932. {
  933. switch (level) {
  934. case SOL_RAW:
  935. break;
  936. case SOL_ICMPV6:
  937. if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
  938. return -EOPNOTSUPP;
  939. return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
  940. case SOL_IPV6:
  941. if (optname == IPV6_CHECKSUM ||
  942. optname == IPV6_HDRINCL)
  943. break;
  944. fallthrough;
  945. default:
  946. return ipv6_getsockopt(sk, level, optname, optval, optlen);
  947. }
  948. return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
  949. }
  950. static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
  951. {
  952. switch (cmd) {
  953. case SIOCOUTQ: {
  954. int amount = sk_wmem_alloc_get(sk);
  955. return put_user(amount, (int __user *)arg);
  956. }
  957. case SIOCINQ: {
  958. struct sk_buff *skb;
  959. int amount = 0;
  960. spin_lock_bh(&sk->sk_receive_queue.lock);
  961. skb = skb_peek(&sk->sk_receive_queue);
  962. if (skb)
  963. amount = skb->len;
  964. spin_unlock_bh(&sk->sk_receive_queue.lock);
  965. return put_user(amount, (int __user *)arg);
  966. }
  967. default:
  968. #ifdef CONFIG_IPV6_MROUTE
  969. return ip6mr_ioctl(sk, cmd, (void __user *)arg);
  970. #else
  971. return -ENOIOCTLCMD;
  972. #endif
  973. }
  974. }
  975. #ifdef CONFIG_COMPAT
  976. static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
  977. {
  978. switch (cmd) {
  979. case SIOCOUTQ:
  980. case SIOCINQ:
  981. return -ENOIOCTLCMD;
  982. default:
  983. #ifdef CONFIG_IPV6_MROUTE
  984. return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg));
  985. #else
  986. return -ENOIOCTLCMD;
  987. #endif
  988. }
  989. }
  990. #endif
  991. static void rawv6_close(struct sock *sk, long timeout)
  992. {
  993. if (inet_sk(sk)->inet_num == IPPROTO_RAW)
  994. ip6_ra_control(sk, -1);
  995. ip6mr_sk_done(sk);
  996. sk_common_release(sk);
  997. }
  998. static void raw6_destroy(struct sock *sk)
  999. {
  1000. lock_sock(sk);
  1001. ip6_flush_pending_frames(sk);
  1002. release_sock(sk);
  1003. }
  1004. static int rawv6_init_sk(struct sock *sk)
  1005. {
  1006. struct raw6_sock *rp = raw6_sk(sk);
  1007. switch (inet_sk(sk)->inet_num) {
  1008. case IPPROTO_ICMPV6:
  1009. rp->checksum = 1;
  1010. rp->offset = 2;
  1011. break;
  1012. case IPPROTO_MH:
  1013. rp->checksum = 1;
  1014. rp->offset = 4;
  1015. break;
  1016. default:
  1017. break;
  1018. }
  1019. return 0;
  1020. }
  1021. struct proto rawv6_prot = {
  1022. .name = "RAWv6",
  1023. .owner = THIS_MODULE,
  1024. .close = rawv6_close,
  1025. .destroy = raw6_destroy,
  1026. .connect = ip6_datagram_connect_v6_only,
  1027. .disconnect = __udp_disconnect,
  1028. .ioctl = rawv6_ioctl,
  1029. .init = rawv6_init_sk,
  1030. .setsockopt = rawv6_setsockopt,
  1031. .getsockopt = rawv6_getsockopt,
  1032. .sendmsg = rawv6_sendmsg,
  1033. .recvmsg = rawv6_recvmsg,
  1034. .bind = rawv6_bind,
  1035. .backlog_rcv = rawv6_rcv_skb,
  1036. .hash = raw_hash_sk,
  1037. .unhash = raw_unhash_sk,
  1038. .obj_size = sizeof(struct raw6_sock),
  1039. .useroffset = offsetof(struct raw6_sock, filter),
  1040. .usersize = sizeof_field(struct raw6_sock, filter),
  1041. .h.raw_hash = &raw_v6_hashinfo,
  1042. #ifdef CONFIG_COMPAT
  1043. .compat_ioctl = compat_rawv6_ioctl,
  1044. #endif
  1045. .diag_destroy = raw_abort,
  1046. };
  1047. #ifdef CONFIG_PROC_FS
  1048. static int raw6_seq_show(struct seq_file *seq, void *v)
  1049. {
  1050. if (v == SEQ_START_TOKEN) {
  1051. seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
  1052. } else {
  1053. struct sock *sp = v;
  1054. __u16 srcp = inet_sk(sp)->inet_num;
  1055. ip6_dgram_sock_seq_show(seq, v, srcp, 0,
  1056. raw_seq_private(seq)->bucket);
  1057. }
  1058. return 0;
  1059. }
  1060. static const struct seq_operations raw6_seq_ops = {
  1061. .start = raw_seq_start,
  1062. .next = raw_seq_next,
  1063. .stop = raw_seq_stop,
  1064. .show = raw6_seq_show,
  1065. };
  1066. static int __net_init raw6_init_net(struct net *net)
  1067. {
  1068. if (!proc_create_net_data("raw6", 0444, net->proc_net, &raw6_seq_ops,
  1069. sizeof(struct raw_iter_state), &raw_v6_hashinfo))
  1070. return -ENOMEM;
  1071. return 0;
  1072. }
  1073. static void __net_exit raw6_exit_net(struct net *net)
  1074. {
  1075. remove_proc_entry("raw6", net->proc_net);
  1076. }
  1077. static struct pernet_operations raw6_net_ops = {
  1078. .init = raw6_init_net,
  1079. .exit = raw6_exit_net,
  1080. };
  1081. int __init raw6_proc_init(void)
  1082. {
  1083. return register_pernet_subsys(&raw6_net_ops);
  1084. }
  1085. void raw6_proc_exit(void)
  1086. {
  1087. unregister_pernet_subsys(&raw6_net_ops);
  1088. }
  1089. #endif /* CONFIG_PROC_FS */
  1090. /* Same as inet6_dgram_ops, sans udp_poll. */
  1091. const struct proto_ops inet6_sockraw_ops = {
  1092. .family = PF_INET6,
  1093. .owner = THIS_MODULE,
  1094. .release = inet6_release,
  1095. .bind = inet6_bind,
  1096. .connect = inet_dgram_connect, /* ok */
  1097. .socketpair = sock_no_socketpair, /* a do nothing */
  1098. .accept = sock_no_accept, /* a do nothing */
  1099. .getname = inet6_getname,
  1100. .poll = datagram_poll, /* ok */
  1101. .ioctl = inet6_ioctl, /* must change */
  1102. .gettstamp = sock_gettstamp,
  1103. .listen = sock_no_listen, /* ok */
  1104. .shutdown = inet_shutdown, /* ok */
  1105. .setsockopt = sock_common_setsockopt, /* ok */
  1106. .getsockopt = sock_common_getsockopt, /* ok */
  1107. .sendmsg = inet_sendmsg, /* ok */
  1108. .recvmsg = sock_common_recvmsg, /* ok */
  1109. .mmap = sock_no_mmap,
  1110. .sendpage = sock_no_sendpage,
  1111. #ifdef CONFIG_COMPAT
  1112. .compat_ioctl = inet6_compat_ioctl,
  1113. #endif
  1114. };
  1115. static struct inet_protosw rawv6_protosw = {
  1116. .type = SOCK_RAW,
  1117. .protocol = IPPROTO_IP, /* wild card */
  1118. .prot = &rawv6_prot,
  1119. .ops = &inet6_sockraw_ops,
  1120. .flags = INET_PROTOSW_REUSE,
  1121. };
  1122. int __init rawv6_init(void)
  1123. {
  1124. return inet6_register_protosw(&rawv6_protosw);
  1125. }
  1126. void rawv6_exit(void)
  1127. {
  1128. inet6_unregister_protosw(&rawv6_protosw);
  1129. }