/net/ipv4/raw.c

http://github.com/mirrors/linux · C · 1157 lines · 901 code · 161 blank · 95 comment · 188 complexity · ebb8093d0f79ec1050075978ce66ec5c MD5 · raw file

  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * INET An implementation of the TCP/IP protocol suite for the LINUX
  4. * operating system. INET is implemented using the BSD Socket
  5. * interface as the means of communication with the user level.
  6. *
  7. * RAW - implementation of IP "raw" sockets.
  8. *
  9. * Authors: Ross Biro
  10. * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  11. *
  12. * Fixes:
  13. * Alan Cox : verify_area() fixed up
  14. * Alan Cox : ICMP error handling
  15. * Alan Cox : EMSGSIZE if you send too big a packet
  16. * Alan Cox : Now uses generic datagrams and shared
  17. * skbuff library. No more peek crashes,
  18. * no more backlogs
  19. * Alan Cox : Checks sk->broadcast.
  20. * Alan Cox : Uses skb_free_datagram/skb_copy_datagram
  21. * Alan Cox : Raw passes ip options too
  22. * Alan Cox : Setsocketopt added
  23. * Alan Cox : Fixed error return for broadcasts
  24. * Alan Cox : Removed wake_up calls
  25. * Alan Cox : Use ttl/tos
  26. * Alan Cox : Cleaned up old debugging
  27. * Alan Cox : Use new kernel side addresses
  28. * Arnt Gulbrandsen : Fixed MSG_DONTROUTE in raw sockets.
  29. * Alan Cox : BSD style RAW socket demultiplexing.
  30. * Alan Cox : Beginnings of mrouted support.
  31. * Alan Cox : Added IP_HDRINCL option.
  32. * Alan Cox : Skip broadcast check if BSDism set.
  33. * David S. Miller : New socket lookup architecture.
  34. */
  35. #include <linux/types.h>
  36. #include <linux/atomic.h>
  37. #include <asm/byteorder.h>
  38. #include <asm/current.h>
  39. #include <linux/uaccess.h>
  40. #include <asm/ioctls.h>
  41. #include <linux/stddef.h>
  42. #include <linux/slab.h>
  43. #include <linux/errno.h>
  44. #include <linux/kernel.h>
  45. #include <linux/export.h>
  46. #include <linux/spinlock.h>
  47. #include <linux/sockios.h>
  48. #include <linux/socket.h>
  49. #include <linux/in.h>
  50. #include <linux/mroute.h>
  51. #include <linux/netdevice.h>
  52. #include <linux/in_route.h>
  53. #include <linux/route.h>
  54. #include <linux/skbuff.h>
  55. #include <linux/igmp.h>
  56. #include <net/net_namespace.h>
  57. #include <net/dst.h>
  58. #include <net/sock.h>
  59. #include <linux/ip.h>
  60. #include <linux/net.h>
  61. #include <net/ip.h>
  62. #include <net/icmp.h>
  63. #include <net/udp.h>
  64. #include <net/raw.h>
  65. #include <net/snmp.h>
  66. #include <net/tcp_states.h>
  67. #include <net/inet_common.h>
  68. #include <net/checksum.h>
  69. #include <net/xfrm.h>
  70. #include <linux/rtnetlink.h>
  71. #include <linux/proc_fs.h>
  72. #include <linux/seq_file.h>
  73. #include <linux/netfilter.h>
  74. #include <linux/netfilter_ipv4.h>
  75. #include <linux/compat.h>
  76. #include <linux/uio.h>
  77. struct raw_frag_vec {
  78. struct msghdr *msg;
  79. union {
  80. struct icmphdr icmph;
  81. char c[1];
  82. } hdr;
  83. int hlen;
  84. };
  85. struct raw_hashinfo raw_v4_hashinfo = {
  86. .lock = __RW_LOCK_UNLOCKED(raw_v4_hashinfo.lock),
  87. };
  88. EXPORT_SYMBOL_GPL(raw_v4_hashinfo);
  89. int raw_hash_sk(struct sock *sk)
  90. {
  91. struct raw_hashinfo *h = sk->sk_prot->h.raw_hash;
  92. struct hlist_head *head;
  93. head = &h->ht[inet_sk(sk)->inet_num & (RAW_HTABLE_SIZE - 1)];
  94. write_lock_bh(&h->lock);
  95. sk_add_node(sk, head);
  96. sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
  97. write_unlock_bh(&h->lock);
  98. return 0;
  99. }
  100. EXPORT_SYMBOL_GPL(raw_hash_sk);
  101. void raw_unhash_sk(struct sock *sk)
  102. {
  103. struct raw_hashinfo *h = sk->sk_prot->h.raw_hash;
  104. write_lock_bh(&h->lock);
  105. if (sk_del_node_init(sk))
  106. sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
  107. write_unlock_bh(&h->lock);
  108. }
  109. EXPORT_SYMBOL_GPL(raw_unhash_sk);
  110. struct sock *__raw_v4_lookup(struct net *net, struct sock *sk,
  111. unsigned short num, __be32 raddr, __be32 laddr,
  112. int dif, int sdif)
  113. {
  114. sk_for_each_from(sk) {
  115. struct inet_sock *inet = inet_sk(sk);
  116. if (net_eq(sock_net(sk), net) && inet->inet_num == num &&
  117. !(inet->inet_daddr && inet->inet_daddr != raddr) &&
  118. !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) &&
  119. raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif))
  120. goto found; /* gotcha */
  121. }
  122. sk = NULL;
  123. found:
  124. return sk;
  125. }
  126. EXPORT_SYMBOL_GPL(__raw_v4_lookup);
  127. /*
  128. * 0 - deliver
  129. * 1 - block
  130. */
  131. static int icmp_filter(const struct sock *sk, const struct sk_buff *skb)
  132. {
  133. struct icmphdr _hdr;
  134. const struct icmphdr *hdr;
  135. hdr = skb_header_pointer(skb, skb_transport_offset(skb),
  136. sizeof(_hdr), &_hdr);
  137. if (!hdr)
  138. return 1;
  139. if (hdr->type < 32) {
  140. __u32 data = raw_sk(sk)->filter.data;
  141. return ((1U << hdr->type) & data) != 0;
  142. }
  143. /* Do not block unknown ICMP types */
  144. return 0;
  145. }
  146. /* IP input processing comes here for RAW socket delivery.
  147. * Caller owns SKB, so we must make clones.
  148. *
  149. * RFC 1122: SHOULD pass TOS value up to the transport layer.
  150. * -> It does. And not only TOS, but all IP header.
  151. */
  152. static int raw_v4_input(struct sk_buff *skb, const struct iphdr *iph, int hash)
  153. {
  154. int sdif = inet_sdif(skb);
  155. int dif = inet_iif(skb);
  156. struct sock *sk;
  157. struct hlist_head *head;
  158. int delivered = 0;
  159. struct net *net;
  160. read_lock(&raw_v4_hashinfo.lock);
  161. head = &raw_v4_hashinfo.ht[hash];
  162. if (hlist_empty(head))
  163. goto out;
  164. net = dev_net(skb->dev);
  165. sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol,
  166. iph->saddr, iph->daddr, dif, sdif);
  167. while (sk) {
  168. delivered = 1;
  169. if ((iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) &&
  170. ip_mc_sf_allow(sk, iph->daddr, iph->saddr,
  171. skb->dev->ifindex, sdif)) {
  172. struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
  173. /* Not releasing hash table! */
  174. if (clone)
  175. raw_rcv(sk, clone);
  176. }
  177. sk = __raw_v4_lookup(net, sk_next(sk), iph->protocol,
  178. iph->saddr, iph->daddr,
  179. dif, sdif);
  180. }
  181. out:
  182. read_unlock(&raw_v4_hashinfo.lock);
  183. return delivered;
  184. }
  185. int raw_local_deliver(struct sk_buff *skb, int protocol)
  186. {
  187. int hash;
  188. struct sock *raw_sk;
  189. hash = protocol & (RAW_HTABLE_SIZE - 1);
  190. raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
  191. /* If there maybe a raw socket we must check - if not we
  192. * don't care less
  193. */
  194. if (raw_sk && !raw_v4_input(skb, ip_hdr(skb), hash))
  195. raw_sk = NULL;
  196. return raw_sk != NULL;
  197. }
  198. static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info)
  199. {
  200. struct inet_sock *inet = inet_sk(sk);
  201. const int type = icmp_hdr(skb)->type;
  202. const int code = icmp_hdr(skb)->code;
  203. int err = 0;
  204. int harderr = 0;
  205. if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED)
  206. ipv4_sk_update_pmtu(skb, sk, info);
  207. else if (type == ICMP_REDIRECT) {
  208. ipv4_sk_redirect(skb, sk);
  209. return;
  210. }
  211. /* Report error on raw socket, if:
  212. 1. User requested ip_recverr.
  213. 2. Socket is connected (otherwise the error indication
  214. is useless without ip_recverr and error is hard.
  215. */
  216. if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED)
  217. return;
  218. switch (type) {
  219. default:
  220. case ICMP_TIME_EXCEEDED:
  221. err = EHOSTUNREACH;
  222. break;
  223. case ICMP_SOURCE_QUENCH:
  224. return;
  225. case ICMP_PARAMETERPROB:
  226. err = EPROTO;
  227. harderr = 1;
  228. break;
  229. case ICMP_DEST_UNREACH:
  230. err = EHOSTUNREACH;
  231. if (code > NR_ICMP_UNREACH)
  232. break;
  233. err = icmp_err_convert[code].errno;
  234. harderr = icmp_err_convert[code].fatal;
  235. if (code == ICMP_FRAG_NEEDED) {
  236. harderr = inet->pmtudisc != IP_PMTUDISC_DONT;
  237. err = EMSGSIZE;
  238. }
  239. }
  240. if (inet->recverr) {
  241. const struct iphdr *iph = (const struct iphdr *)skb->data;
  242. u8 *payload = skb->data + (iph->ihl << 2);
  243. if (inet->hdrincl)
  244. payload = skb->data;
  245. ip_icmp_error(sk, skb, err, 0, info, payload);
  246. }
  247. if (inet->recverr || harderr) {
  248. sk->sk_err = err;
  249. sk->sk_error_report(sk);
  250. }
  251. }
  252. void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info)
  253. {
  254. int hash;
  255. struct sock *raw_sk;
  256. const struct iphdr *iph;
  257. struct net *net;
  258. hash = protocol & (RAW_HTABLE_SIZE - 1);
  259. read_lock(&raw_v4_hashinfo.lock);
  260. raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
  261. if (raw_sk) {
  262. int dif = skb->dev->ifindex;
  263. int sdif = inet_sdif(skb);
  264. iph = (const struct iphdr *)skb->data;
  265. net = dev_net(skb->dev);
  266. while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol,
  267. iph->daddr, iph->saddr,
  268. dif, sdif)) != NULL) {
  269. raw_err(raw_sk, skb, info);
  270. raw_sk = sk_next(raw_sk);
  271. iph = (const struct iphdr *)skb->data;
  272. }
  273. }
  274. read_unlock(&raw_v4_hashinfo.lock);
  275. }
  276. static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
  277. {
  278. /* Charge it to the socket. */
  279. ipv4_pktinfo_prepare(sk, skb);
  280. if (sock_queue_rcv_skb(sk, skb) < 0) {
  281. kfree_skb(skb);
  282. return NET_RX_DROP;
  283. }
  284. return NET_RX_SUCCESS;
  285. }
  286. int raw_rcv(struct sock *sk, struct sk_buff *skb)
  287. {
  288. if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
  289. atomic_inc(&sk->sk_drops);
  290. kfree_skb(skb);
  291. return NET_RX_DROP;
  292. }
  293. nf_reset_ct(skb);
  294. skb_push(skb, skb->data - skb_network_header(skb));
  295. raw_rcv_skb(sk, skb);
  296. return 0;
  297. }
  298. static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
  299. struct msghdr *msg, size_t length,
  300. struct rtable **rtp, unsigned int flags,
  301. const struct sockcm_cookie *sockc)
  302. {
  303. struct inet_sock *inet = inet_sk(sk);
  304. struct net *net = sock_net(sk);
  305. struct iphdr *iph;
  306. struct sk_buff *skb;
  307. unsigned int iphlen;
  308. int err;
  309. struct rtable *rt = *rtp;
  310. int hlen, tlen;
  311. if (length > rt->dst.dev->mtu) {
  312. ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport,
  313. rt->dst.dev->mtu);
  314. return -EMSGSIZE;
  315. }
  316. if (length < sizeof(struct iphdr))
  317. return -EINVAL;
  318. if (flags&MSG_PROBE)
  319. goto out;
  320. hlen = LL_RESERVED_SPACE(rt->dst.dev);
  321. tlen = rt->dst.dev->needed_tailroom;
  322. skb = sock_alloc_send_skb(sk,
  323. length + hlen + tlen + 15,
  324. flags & MSG_DONTWAIT, &err);
  325. if (!skb)
  326. goto error;
  327. skb_reserve(skb, hlen);
  328. skb->priority = sk->sk_priority;
  329. skb->mark = sockc->mark;
  330. skb->tstamp = sockc->transmit_time;
  331. skb_dst_set(skb, &rt->dst);
  332. *rtp = NULL;
  333. skb_reset_network_header(skb);
  334. iph = ip_hdr(skb);
  335. skb_put(skb, length);
  336. skb->ip_summed = CHECKSUM_NONE;
  337. skb_setup_tx_timestamp(skb, sockc->tsflags);
  338. if (flags & MSG_CONFIRM)
  339. skb_set_dst_pending_confirm(skb, 1);
  340. skb->transport_header = skb->network_header;
  341. err = -EFAULT;
  342. if (memcpy_from_msg(iph, msg, length))
  343. goto error_free;
  344. iphlen = iph->ihl * 4;
  345. /*
  346. * We don't want to modify the ip header, but we do need to
  347. * be sure that it won't cause problems later along the network
  348. * stack. Specifically we want to make sure that iph->ihl is a
  349. * sane value. If ihl points beyond the length of the buffer passed
  350. * in, reject the frame as invalid
  351. */
  352. err = -EINVAL;
  353. if (iphlen > length)
  354. goto error_free;
  355. if (iphlen >= sizeof(*iph)) {
  356. if (!iph->saddr)
  357. iph->saddr = fl4->saddr;
  358. iph->check = 0;
  359. iph->tot_len = htons(length);
  360. if (!iph->id)
  361. ip_select_ident(net, skb, NULL);
  362. iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
  363. skb->transport_header += iphlen;
  364. if (iph->protocol == IPPROTO_ICMP &&
  365. length >= iphlen + sizeof(struct icmphdr))
  366. icmp_out_count(net, ((struct icmphdr *)
  367. skb_transport_header(skb))->type);
  368. }
  369. err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT,
  370. net, sk, skb, NULL, rt->dst.dev,
  371. dst_output);
  372. if (err > 0)
  373. err = net_xmit_errno(err);
  374. if (err)
  375. goto error;
  376. out:
  377. return 0;
  378. error_free:
  379. kfree_skb(skb);
  380. error:
  381. IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS);
  382. if (err == -ENOBUFS && !inet->recverr)
  383. err = 0;
  384. return err;
  385. }
  386. static int raw_probe_proto_opt(struct raw_frag_vec *rfv, struct flowi4 *fl4)
  387. {
  388. int err;
  389. if (fl4->flowi4_proto != IPPROTO_ICMP)
  390. return 0;
  391. /* We only need the first two bytes. */
  392. rfv->hlen = 2;
  393. err = memcpy_from_msg(rfv->hdr.c, rfv->msg, rfv->hlen);
  394. if (err)
  395. return err;
  396. fl4->fl4_icmp_type = rfv->hdr.icmph.type;
  397. fl4->fl4_icmp_code = rfv->hdr.icmph.code;
  398. return 0;
  399. }
  400. static int raw_getfrag(void *from, char *to, int offset, int len, int odd,
  401. struct sk_buff *skb)
  402. {
  403. struct raw_frag_vec *rfv = from;
  404. if (offset < rfv->hlen) {
  405. int copy = min(rfv->hlen - offset, len);
  406. if (skb->ip_summed == CHECKSUM_PARTIAL)
  407. memcpy(to, rfv->hdr.c + offset, copy);
  408. else
  409. skb->csum = csum_block_add(
  410. skb->csum,
  411. csum_partial_copy_nocheck(rfv->hdr.c + offset,
  412. to, copy, 0),
  413. odd);
  414. odd = 0;
  415. offset += copy;
  416. to += copy;
  417. len -= copy;
  418. if (!len)
  419. return 0;
  420. }
  421. offset -= rfv->hlen;
  422. return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
  423. }
  424. static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
  425. {
  426. struct inet_sock *inet = inet_sk(sk);
  427. struct net *net = sock_net(sk);
  428. struct ipcm_cookie ipc;
  429. struct rtable *rt = NULL;
  430. struct flowi4 fl4;
  431. int free = 0;
  432. __be32 daddr;
  433. __be32 saddr;
  434. u8 tos;
  435. int err;
  436. struct ip_options_data opt_copy;
  437. struct raw_frag_vec rfv;
  438. int hdrincl;
  439. err = -EMSGSIZE;
  440. if (len > 0xFFFF)
  441. goto out;
  442. /* hdrincl should be READ_ONCE(inet->hdrincl)
  443. * but READ_ONCE() doesn't work with bit fields.
  444. * Doing this indirectly yields the same result.
  445. */
  446. hdrincl = inet->hdrincl;
  447. hdrincl = READ_ONCE(hdrincl);
  448. /*
  449. * Check the flags.
  450. */
  451. err = -EOPNOTSUPP;
  452. if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */
  453. goto out; /* compatibility */
  454. /*
  455. * Get and verify the address.
  456. */
  457. if (msg->msg_namelen) {
  458. DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
  459. err = -EINVAL;
  460. if (msg->msg_namelen < sizeof(*usin))
  461. goto out;
  462. if (usin->sin_family != AF_INET) {
  463. pr_info_once("%s: %s forgot to set AF_INET. Fix it!\n",
  464. __func__, current->comm);
  465. err = -EAFNOSUPPORT;
  466. if (usin->sin_family)
  467. goto out;
  468. }
  469. daddr = usin->sin_addr.s_addr;
  470. /* ANK: I did not forget to get protocol from port field.
  471. * I just do not know, who uses this weirdness.
  472. * IP_HDRINCL is much more convenient.
  473. */
  474. } else {
  475. err = -EDESTADDRREQ;
  476. if (sk->sk_state != TCP_ESTABLISHED)
  477. goto out;
  478. daddr = inet->inet_daddr;
  479. }
  480. ipcm_init_sk(&ipc, inet);
  481. if (msg->msg_controllen) {
  482. err = ip_cmsg_send(sk, msg, &ipc, false);
  483. if (unlikely(err)) {
  484. kfree(ipc.opt);
  485. goto out;
  486. }
  487. if (ipc.opt)
  488. free = 1;
  489. }
  490. saddr = ipc.addr;
  491. ipc.addr = daddr;
  492. if (!ipc.opt) {
  493. struct ip_options_rcu *inet_opt;
  494. rcu_read_lock();
  495. inet_opt = rcu_dereference(inet->inet_opt);
  496. if (inet_opt) {
  497. memcpy(&opt_copy, inet_opt,
  498. sizeof(*inet_opt) + inet_opt->opt.optlen);
  499. ipc.opt = &opt_copy.opt;
  500. }
  501. rcu_read_unlock();
  502. }
  503. if (ipc.opt) {
  504. err = -EINVAL;
  505. /* Linux does not mangle headers on raw sockets,
  506. * so that IP options + IP_HDRINCL is non-sense.
  507. */
  508. if (hdrincl)
  509. goto done;
  510. if (ipc.opt->opt.srr) {
  511. if (!daddr)
  512. goto done;
  513. daddr = ipc.opt->opt.faddr;
  514. }
  515. }
  516. tos = get_rtconn_flags(&ipc, sk);
  517. if (msg->msg_flags & MSG_DONTROUTE)
  518. tos |= RTO_ONLINK;
  519. if (ipv4_is_multicast(daddr)) {
  520. if (!ipc.oif || netif_index_is_l3_master(sock_net(sk), ipc.oif))
  521. ipc.oif = inet->mc_index;
  522. if (!saddr)
  523. saddr = inet->mc_addr;
  524. } else if (!ipc.oif) {
  525. ipc.oif = inet->uc_index;
  526. } else if (ipv4_is_lbcast(daddr) && inet->uc_index) {
  527. /* oif is set, packet is to local broadcast and
  528. * and uc_index is set. oif is most likely set
  529. * by sk_bound_dev_if. If uc_index != oif check if the
  530. * oif is an L3 master and uc_index is an L3 slave.
  531. * If so, we want to allow the send using the uc_index.
  532. */
  533. if (ipc.oif != inet->uc_index &&
  534. ipc.oif == l3mdev_master_ifindex_by_index(sock_net(sk),
  535. inet->uc_index)) {
  536. ipc.oif = inet->uc_index;
  537. }
  538. }
  539. flowi4_init_output(&fl4, ipc.oif, ipc.sockc.mark, tos,
  540. RT_SCOPE_UNIVERSE,
  541. hdrincl ? IPPROTO_RAW : sk->sk_protocol,
  542. inet_sk_flowi_flags(sk) |
  543. (hdrincl ? FLOWI_FLAG_KNOWN_NH : 0),
  544. daddr, saddr, 0, 0, sk->sk_uid);
  545. if (!hdrincl) {
  546. rfv.msg = msg;
  547. rfv.hlen = 0;
  548. err = raw_probe_proto_opt(&rfv, &fl4);
  549. if (err)
  550. goto done;
  551. }
  552. security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
  553. rt = ip_route_output_flow(net, &fl4, sk);
  554. if (IS_ERR(rt)) {
  555. err = PTR_ERR(rt);
  556. rt = NULL;
  557. goto done;
  558. }
  559. err = -EACCES;
  560. if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
  561. goto done;
  562. if (msg->msg_flags & MSG_CONFIRM)
  563. goto do_confirm;
  564. back_from_confirm:
  565. if (hdrincl)
  566. err = raw_send_hdrinc(sk, &fl4, msg, len,
  567. &rt, msg->msg_flags, &ipc.sockc);
  568. else {
  569. if (!ipc.addr)
  570. ipc.addr = fl4.daddr;
  571. lock_sock(sk);
  572. err = ip_append_data(sk, &fl4, raw_getfrag,
  573. &rfv, len, 0,
  574. &ipc, &rt, msg->msg_flags);
  575. if (err)
  576. ip_flush_pending_frames(sk);
  577. else if (!(msg->msg_flags & MSG_MORE)) {
  578. err = ip_push_pending_frames(sk, &fl4);
  579. if (err == -ENOBUFS && !inet->recverr)
  580. err = 0;
  581. }
  582. release_sock(sk);
  583. }
  584. done:
  585. if (free)
  586. kfree(ipc.opt);
  587. ip_rt_put(rt);
  588. out:
  589. if (err < 0)
  590. return err;
  591. return len;
  592. do_confirm:
  593. if (msg->msg_flags & MSG_PROBE)
  594. dst_confirm_neigh(&rt->dst, &fl4.daddr);
  595. if (!(msg->msg_flags & MSG_PROBE) || len)
  596. goto back_from_confirm;
  597. err = 0;
  598. goto done;
  599. }
  600. static void raw_close(struct sock *sk, long timeout)
  601. {
  602. /*
  603. * Raw sockets may have direct kernel references. Kill them.
  604. */
  605. ip_ra_control(sk, 0, NULL);
  606. sk_common_release(sk);
  607. }
  608. static void raw_destroy(struct sock *sk)
  609. {
  610. lock_sock(sk);
  611. ip_flush_pending_frames(sk);
  612. release_sock(sk);
  613. }
  614. /* This gets rid of all the nasties in af_inet. -DaveM */
  615. static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
  616. {
  617. struct inet_sock *inet = inet_sk(sk);
  618. struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
  619. u32 tb_id = RT_TABLE_LOCAL;
  620. int ret = -EINVAL;
  621. int chk_addr_ret;
  622. if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
  623. goto out;
  624. if (sk->sk_bound_dev_if)
  625. tb_id = l3mdev_fib_table_by_index(sock_net(sk),
  626. sk->sk_bound_dev_if) ? : tb_id;
  627. chk_addr_ret = inet_addr_type_table(sock_net(sk), addr->sin_addr.s_addr,
  628. tb_id);
  629. ret = -EADDRNOTAVAIL;
  630. if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
  631. chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
  632. goto out;
  633. inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
  634. if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
  635. inet->inet_saddr = 0; /* Use device */
  636. sk_dst_reset(sk);
  637. ret = 0;
  638. out: return ret;
  639. }
  640. /*
  641. * This should be easy, if there is something there
  642. * we return it, otherwise we block.
  643. */
  644. static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
  645. int noblock, int flags, int *addr_len)
  646. {
  647. struct inet_sock *inet = inet_sk(sk);
  648. size_t copied = 0;
  649. int err = -EOPNOTSUPP;
  650. DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
  651. struct sk_buff *skb;
  652. if (flags & MSG_OOB)
  653. goto out;
  654. if (flags & MSG_ERRQUEUE) {
  655. err = ip_recv_error(sk, msg, len, addr_len);
  656. goto out;
  657. }
  658. skb = skb_recv_datagram(sk, flags, noblock, &err);
  659. if (!skb)
  660. goto out;
  661. copied = skb->len;
  662. if (len < copied) {
  663. msg->msg_flags |= MSG_TRUNC;
  664. copied = len;
  665. }
  666. err = skb_copy_datagram_msg(skb, 0, msg, copied);
  667. if (err)
  668. goto done;
  669. sock_recv_ts_and_drops(msg, sk, skb);
  670. /* Copy the address. */
  671. if (sin) {
  672. sin->sin_family = AF_INET;
  673. sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
  674. sin->sin_port = 0;
  675. memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
  676. *addr_len = sizeof(*sin);
  677. }
  678. if (inet->cmsg_flags)
  679. ip_cmsg_recv(msg, skb);
  680. if (flags & MSG_TRUNC)
  681. copied = skb->len;
  682. done:
  683. skb_free_datagram(sk, skb);
  684. out:
  685. if (err)
  686. return err;
  687. return copied;
  688. }
  689. static int raw_sk_init(struct sock *sk)
  690. {
  691. struct raw_sock *rp = raw_sk(sk);
  692. if (inet_sk(sk)->inet_num == IPPROTO_ICMP)
  693. memset(&rp->filter, 0, sizeof(rp->filter));
  694. return 0;
  695. }
  696. static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen)
  697. {
  698. if (optlen > sizeof(struct icmp_filter))
  699. optlen = sizeof(struct icmp_filter);
  700. if (copy_from_user(&raw_sk(sk)->filter, optval, optlen))
  701. return -EFAULT;
  702. return 0;
  703. }
  704. static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
  705. {
  706. int len, ret = -EFAULT;
  707. if (get_user(len, optlen))
  708. goto out;
  709. ret = -EINVAL;
  710. if (len < 0)
  711. goto out;
  712. if (len > sizeof(struct icmp_filter))
  713. len = sizeof(struct icmp_filter);
  714. ret = -EFAULT;
  715. if (put_user(len, optlen) ||
  716. copy_to_user(optval, &raw_sk(sk)->filter, len))
  717. goto out;
  718. ret = 0;
  719. out: return ret;
  720. }
  721. static int do_raw_setsockopt(struct sock *sk, int level, int optname,
  722. char __user *optval, unsigned int optlen)
  723. {
  724. if (optname == ICMP_FILTER) {
  725. if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
  726. return -EOPNOTSUPP;
  727. else
  728. return raw_seticmpfilter(sk, optval, optlen);
  729. }
  730. return -ENOPROTOOPT;
  731. }
  732. static int raw_setsockopt(struct sock *sk, int level, int optname,
  733. char __user *optval, unsigned int optlen)
  734. {
  735. if (level != SOL_RAW)
  736. return ip_setsockopt(sk, level, optname, optval, optlen);
  737. return do_raw_setsockopt(sk, level, optname, optval, optlen);
  738. }
  739. #ifdef CONFIG_COMPAT
  740. static int compat_raw_setsockopt(struct sock *sk, int level, int optname,
  741. char __user *optval, unsigned int optlen)
  742. {
  743. if (level != SOL_RAW)
  744. return compat_ip_setsockopt(sk, level, optname, optval, optlen);
  745. return do_raw_setsockopt(sk, level, optname, optval, optlen);
  746. }
  747. #endif
  748. static int do_raw_getsockopt(struct sock *sk, int level, int optname,
  749. char __user *optval, int __user *optlen)
  750. {
  751. if (optname == ICMP_FILTER) {
  752. if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
  753. return -EOPNOTSUPP;
  754. else
  755. return raw_geticmpfilter(sk, optval, optlen);
  756. }
  757. return -ENOPROTOOPT;
  758. }
  759. static int raw_getsockopt(struct sock *sk, int level, int optname,
  760. char __user *optval, int __user *optlen)
  761. {
  762. if (level != SOL_RAW)
  763. return ip_getsockopt(sk, level, optname, optval, optlen);
  764. return do_raw_getsockopt(sk, level, optname, optval, optlen);
  765. }
  766. #ifdef CONFIG_COMPAT
  767. static int compat_raw_getsockopt(struct sock *sk, int level, int optname,
  768. char __user *optval, int __user *optlen)
  769. {
  770. if (level != SOL_RAW)
  771. return compat_ip_getsockopt(sk, level, optname, optval, optlen);
  772. return do_raw_getsockopt(sk, level, optname, optval, optlen);
  773. }
  774. #endif
  775. static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg)
  776. {
  777. switch (cmd) {
  778. case SIOCOUTQ: {
  779. int amount = sk_wmem_alloc_get(sk);
  780. return put_user(amount, (int __user *)arg);
  781. }
  782. case SIOCINQ: {
  783. struct sk_buff *skb;
  784. int amount = 0;
  785. spin_lock_bh(&sk->sk_receive_queue.lock);
  786. skb = skb_peek(&sk->sk_receive_queue);
  787. if (skb)
  788. amount = skb->len;
  789. spin_unlock_bh(&sk->sk_receive_queue.lock);
  790. return put_user(amount, (int __user *)arg);
  791. }
  792. default:
  793. #ifdef CONFIG_IP_MROUTE
  794. return ipmr_ioctl(sk, cmd, (void __user *)arg);
  795. #else
  796. return -ENOIOCTLCMD;
  797. #endif
  798. }
  799. }
  800. #ifdef CONFIG_COMPAT
  801. static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
  802. {
  803. switch (cmd) {
  804. case SIOCOUTQ:
  805. case SIOCINQ:
  806. return -ENOIOCTLCMD;
  807. default:
  808. #ifdef CONFIG_IP_MROUTE
  809. return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg));
  810. #else
  811. return -ENOIOCTLCMD;
  812. #endif
  813. }
  814. }
  815. #endif
  816. int raw_abort(struct sock *sk, int err)
  817. {
  818. lock_sock(sk);
  819. sk->sk_err = err;
  820. sk->sk_error_report(sk);
  821. __udp_disconnect(sk, 0);
  822. release_sock(sk);
  823. return 0;
  824. }
  825. EXPORT_SYMBOL_GPL(raw_abort);
  826. struct proto raw_prot = {
  827. .name = "RAW",
  828. .owner = THIS_MODULE,
  829. .close = raw_close,
  830. .destroy = raw_destroy,
  831. .connect = ip4_datagram_connect,
  832. .disconnect = __udp_disconnect,
  833. .ioctl = raw_ioctl,
  834. .init = raw_sk_init,
  835. .setsockopt = raw_setsockopt,
  836. .getsockopt = raw_getsockopt,
  837. .sendmsg = raw_sendmsg,
  838. .recvmsg = raw_recvmsg,
  839. .bind = raw_bind,
  840. .backlog_rcv = raw_rcv_skb,
  841. .release_cb = ip4_datagram_release_cb,
  842. .hash = raw_hash_sk,
  843. .unhash = raw_unhash_sk,
  844. .obj_size = sizeof(struct raw_sock),
  845. .useroffset = offsetof(struct raw_sock, filter),
  846. .usersize = sizeof_field(struct raw_sock, filter),
  847. .h.raw_hash = &raw_v4_hashinfo,
  848. #ifdef CONFIG_COMPAT
  849. .compat_setsockopt = compat_raw_setsockopt,
  850. .compat_getsockopt = compat_raw_getsockopt,
  851. .compat_ioctl = compat_raw_ioctl,
  852. #endif
  853. .diag_destroy = raw_abort,
  854. };
  855. #ifdef CONFIG_PROC_FS
  856. static struct sock *raw_get_first(struct seq_file *seq)
  857. {
  858. struct sock *sk;
  859. struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file));
  860. struct raw_iter_state *state = raw_seq_private(seq);
  861. for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE;
  862. ++state->bucket) {
  863. sk_for_each(sk, &h->ht[state->bucket])
  864. if (sock_net(sk) == seq_file_net(seq))
  865. goto found;
  866. }
  867. sk = NULL;
  868. found:
  869. return sk;
  870. }
  871. static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
  872. {
  873. struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file));
  874. struct raw_iter_state *state = raw_seq_private(seq);
  875. do {
  876. sk = sk_next(sk);
  877. try_again:
  878. ;
  879. } while (sk && sock_net(sk) != seq_file_net(seq));
  880. if (!sk && ++state->bucket < RAW_HTABLE_SIZE) {
  881. sk = sk_head(&h->ht[state->bucket]);
  882. goto try_again;
  883. }
  884. return sk;
  885. }
  886. static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
  887. {
  888. struct sock *sk = raw_get_first(seq);
  889. if (sk)
  890. while (pos && (sk = raw_get_next(seq, sk)) != NULL)
  891. --pos;
  892. return pos ? NULL : sk;
  893. }
  894. void *raw_seq_start(struct seq_file *seq, loff_t *pos)
  895. __acquires(&h->lock)
  896. {
  897. struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file));
  898. read_lock(&h->lock);
  899. return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
  900. }
  901. EXPORT_SYMBOL_GPL(raw_seq_start);
  902. void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
  903. {
  904. struct sock *sk;
  905. if (v == SEQ_START_TOKEN)
  906. sk = raw_get_first(seq);
  907. else
  908. sk = raw_get_next(seq, v);
  909. ++*pos;
  910. return sk;
  911. }
  912. EXPORT_SYMBOL_GPL(raw_seq_next);
  913. void raw_seq_stop(struct seq_file *seq, void *v)
  914. __releases(&h->lock)
  915. {
  916. struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file));
  917. read_unlock(&h->lock);
  918. }
  919. EXPORT_SYMBOL_GPL(raw_seq_stop);
  920. static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
  921. {
  922. struct inet_sock *inet = inet_sk(sp);
  923. __be32 dest = inet->inet_daddr,
  924. src = inet->inet_rcv_saddr;
  925. __u16 destp = 0,
  926. srcp = inet->inet_num;
  927. seq_printf(seq, "%4d: %08X:%04X %08X:%04X"
  928. " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n",
  929. i, src, srcp, dest, destp, sp->sk_state,
  930. sk_wmem_alloc_get(sp),
  931. sk_rmem_alloc_get(sp),
  932. 0, 0L, 0,
  933. from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
  934. 0, sock_i_ino(sp),
  935. refcount_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
  936. }
  937. static int raw_seq_show(struct seq_file *seq, void *v)
  938. {
  939. if (v == SEQ_START_TOKEN)
  940. seq_printf(seq, " sl local_address rem_address st tx_queue "
  941. "rx_queue tr tm->when retrnsmt uid timeout "
  942. "inode ref pointer drops\n");
  943. else
  944. raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
  945. return 0;
  946. }
  947. static const struct seq_operations raw_seq_ops = {
  948. .start = raw_seq_start,
  949. .next = raw_seq_next,
  950. .stop = raw_seq_stop,
  951. .show = raw_seq_show,
  952. };
  953. static __net_init int raw_init_net(struct net *net)
  954. {
  955. if (!proc_create_net_data("raw", 0444, net->proc_net, &raw_seq_ops,
  956. sizeof(struct raw_iter_state), &raw_v4_hashinfo))
  957. return -ENOMEM;
  958. return 0;
  959. }
  960. static __net_exit void raw_exit_net(struct net *net)
  961. {
  962. remove_proc_entry("raw", net->proc_net);
  963. }
  964. static __net_initdata struct pernet_operations raw_net_ops = {
  965. .init = raw_init_net,
  966. .exit = raw_exit_net,
  967. };
  968. int __init raw_proc_init(void)
  969. {
  970. return register_pernet_subsys(&raw_net_ops);
  971. }
  972. void __init raw_proc_exit(void)
  973. {
  974. unregister_pernet_subsys(&raw_net_ops);
  975. }
  976. #endif /* CONFIG_PROC_FS */
  977. static void raw_sysctl_init_net(struct net *net)
  978. {
  979. #ifdef CONFIG_NET_L3_MASTER_DEV
  980. net->ipv4.sysctl_raw_l3mdev_accept = 1;
  981. #endif
  982. }
  983. static int __net_init raw_sysctl_init(struct net *net)
  984. {
  985. raw_sysctl_init_net(net);
  986. return 0;
  987. }
  988. static struct pernet_operations __net_initdata raw_sysctl_ops = {
  989. .init = raw_sysctl_init,
  990. };
  991. void __init raw_init(void)
  992. {
  993. raw_sysctl_init_net(&init_net);
  994. if (register_pernet_subsys(&raw_sysctl_ops))
  995. panic("RAW: failed to init sysctl parameters.\n");
  996. }