raw.c 25 KB

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  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, <[email protected]>
  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. EXPORT_SYMBOL_GPL(raw_v4_hashinfo);
  87. int raw_hash_sk(struct sock *sk)
  88. {
  89. struct raw_hashinfo *h = sk->sk_prot->h.raw_hash;
  90. struct hlist_head *hlist;
  91. hlist = &h->ht[raw_hashfunc(sock_net(sk), inet_sk(sk)->inet_num)];
  92. spin_lock(&h->lock);
  93. sk_add_node_rcu(sk, hlist);
  94. sock_set_flag(sk, SOCK_RCU_FREE);
  95. spin_unlock(&h->lock);
  96. sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
  97. return 0;
  98. }
  99. EXPORT_SYMBOL_GPL(raw_hash_sk);
  100. void raw_unhash_sk(struct sock *sk)
  101. {
  102. struct raw_hashinfo *h = sk->sk_prot->h.raw_hash;
  103. spin_lock(&h->lock);
  104. if (sk_del_node_init_rcu(sk))
  105. sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
  106. spin_unlock(&h->lock);
  107. }
  108. EXPORT_SYMBOL_GPL(raw_unhash_sk);
  109. bool raw_v4_match(struct net *net, struct sock *sk, unsigned short num,
  110. __be32 raddr, __be32 laddr, int dif, int sdif)
  111. {
  112. struct inet_sock *inet = inet_sk(sk);
  113. if (net_eq(sock_net(sk), net) && inet->inet_num == num &&
  114. !(inet->inet_daddr && inet->inet_daddr != raddr) &&
  115. !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) &&
  116. raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif))
  117. return true;
  118. return false;
  119. }
  120. EXPORT_SYMBOL_GPL(raw_v4_match);
  121. /*
  122. * 0 - deliver
  123. * 1 - block
  124. */
  125. static int icmp_filter(const struct sock *sk, const struct sk_buff *skb)
  126. {
  127. struct icmphdr _hdr;
  128. const struct icmphdr *hdr;
  129. hdr = skb_header_pointer(skb, skb_transport_offset(skb),
  130. sizeof(_hdr), &_hdr);
  131. if (!hdr)
  132. return 1;
  133. if (hdr->type < 32) {
  134. __u32 data = raw_sk(sk)->filter.data;
  135. return ((1U << hdr->type) & data) != 0;
  136. }
  137. /* Do not block unknown ICMP types */
  138. return 0;
  139. }
  140. /* IP input processing comes here for RAW socket delivery.
  141. * Caller owns SKB, so we must make clones.
  142. *
  143. * RFC 1122: SHOULD pass TOS value up to the transport layer.
  144. * -> It does. And not only TOS, but all IP header.
  145. */
  146. static int raw_v4_input(struct net *net, struct sk_buff *skb,
  147. const struct iphdr *iph, int hash)
  148. {
  149. int sdif = inet_sdif(skb);
  150. struct hlist_head *hlist;
  151. int dif = inet_iif(skb);
  152. int delivered = 0;
  153. struct sock *sk;
  154. hlist = &raw_v4_hashinfo.ht[hash];
  155. rcu_read_lock();
  156. sk_for_each_rcu(sk, hlist) {
  157. if (!raw_v4_match(net, sk, iph->protocol,
  158. iph->saddr, iph->daddr, dif, sdif))
  159. continue;
  160. delivered = 1;
  161. if ((iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) &&
  162. ip_mc_sf_allow(sk, iph->daddr, iph->saddr,
  163. skb->dev->ifindex, sdif)) {
  164. struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
  165. /* Not releasing hash table! */
  166. if (clone)
  167. raw_rcv(sk, clone);
  168. }
  169. }
  170. rcu_read_unlock();
  171. return delivered;
  172. }
  173. int raw_local_deliver(struct sk_buff *skb, int protocol)
  174. {
  175. struct net *net = dev_net(skb->dev);
  176. return raw_v4_input(net, skb, ip_hdr(skb),
  177. raw_hashfunc(net, protocol));
  178. }
  179. static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info)
  180. {
  181. struct inet_sock *inet = inet_sk(sk);
  182. const int type = icmp_hdr(skb)->type;
  183. const int code = icmp_hdr(skb)->code;
  184. int err = 0;
  185. int harderr = 0;
  186. if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED)
  187. ipv4_sk_update_pmtu(skb, sk, info);
  188. else if (type == ICMP_REDIRECT) {
  189. ipv4_sk_redirect(skb, sk);
  190. return;
  191. }
  192. /* Report error on raw socket, if:
  193. 1. User requested ip_recverr.
  194. 2. Socket is connected (otherwise the error indication
  195. is useless without ip_recverr and error is hard.
  196. */
  197. if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED)
  198. return;
  199. switch (type) {
  200. default:
  201. case ICMP_TIME_EXCEEDED:
  202. err = EHOSTUNREACH;
  203. break;
  204. case ICMP_SOURCE_QUENCH:
  205. return;
  206. case ICMP_PARAMETERPROB:
  207. err = EPROTO;
  208. harderr = 1;
  209. break;
  210. case ICMP_DEST_UNREACH:
  211. err = EHOSTUNREACH;
  212. if (code > NR_ICMP_UNREACH)
  213. break;
  214. if (code == ICMP_FRAG_NEEDED) {
  215. harderr = inet->pmtudisc != IP_PMTUDISC_DONT;
  216. err = EMSGSIZE;
  217. } else {
  218. err = icmp_err_convert[code].errno;
  219. harderr = icmp_err_convert[code].fatal;
  220. }
  221. }
  222. if (inet->recverr) {
  223. const struct iphdr *iph = (const struct iphdr *)skb->data;
  224. u8 *payload = skb->data + (iph->ihl << 2);
  225. if (inet->hdrincl)
  226. payload = skb->data;
  227. ip_icmp_error(sk, skb, err, 0, info, payload);
  228. }
  229. if (inet->recverr || harderr) {
  230. sk->sk_err = err;
  231. sk_error_report(sk);
  232. }
  233. }
  234. void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info)
  235. {
  236. struct net *net = dev_net(skb->dev);
  237. int dif = skb->dev->ifindex;
  238. int sdif = inet_sdif(skb);
  239. struct hlist_head *hlist;
  240. const struct iphdr *iph;
  241. struct sock *sk;
  242. int hash;
  243. hash = raw_hashfunc(net, protocol);
  244. hlist = &raw_v4_hashinfo.ht[hash];
  245. rcu_read_lock();
  246. sk_for_each_rcu(sk, hlist) {
  247. iph = (const struct iphdr *)skb->data;
  248. if (!raw_v4_match(net, sk, iph->protocol,
  249. iph->daddr, iph->saddr, dif, sdif))
  250. continue;
  251. raw_err(sk, skb, info);
  252. }
  253. rcu_read_unlock();
  254. }
  255. static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
  256. {
  257. /* Charge it to the socket. */
  258. ipv4_pktinfo_prepare(sk, skb);
  259. if (sock_queue_rcv_skb(sk, skb) < 0) {
  260. kfree_skb(skb);
  261. return NET_RX_DROP;
  262. }
  263. return NET_RX_SUCCESS;
  264. }
  265. int raw_rcv(struct sock *sk, struct sk_buff *skb)
  266. {
  267. if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
  268. atomic_inc(&sk->sk_drops);
  269. kfree_skb(skb);
  270. return NET_RX_DROP;
  271. }
  272. nf_reset_ct(skb);
  273. skb_push(skb, skb->data - skb_network_header(skb));
  274. raw_rcv_skb(sk, skb);
  275. return 0;
  276. }
  277. static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
  278. struct msghdr *msg, size_t length,
  279. struct rtable **rtp, unsigned int flags,
  280. const struct sockcm_cookie *sockc)
  281. {
  282. struct inet_sock *inet = inet_sk(sk);
  283. struct net *net = sock_net(sk);
  284. struct iphdr *iph;
  285. struct sk_buff *skb;
  286. unsigned int iphlen;
  287. int err;
  288. struct rtable *rt = *rtp;
  289. int hlen, tlen;
  290. if (length > rt->dst.dev->mtu) {
  291. ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport,
  292. rt->dst.dev->mtu);
  293. return -EMSGSIZE;
  294. }
  295. if (length < sizeof(struct iphdr))
  296. return -EINVAL;
  297. if (flags&MSG_PROBE)
  298. goto out;
  299. hlen = LL_RESERVED_SPACE(rt->dst.dev);
  300. tlen = rt->dst.dev->needed_tailroom;
  301. skb = sock_alloc_send_skb(sk,
  302. length + hlen + tlen + 15,
  303. flags & MSG_DONTWAIT, &err);
  304. if (!skb)
  305. goto error;
  306. skb_reserve(skb, hlen);
  307. skb->priority = READ_ONCE(sk->sk_priority);
  308. skb->mark = sockc->mark;
  309. skb->tstamp = sockc->transmit_time;
  310. skb_dst_set(skb, &rt->dst);
  311. *rtp = NULL;
  312. skb_reset_network_header(skb);
  313. iph = ip_hdr(skb);
  314. skb_put(skb, length);
  315. skb->ip_summed = CHECKSUM_NONE;
  316. skb_setup_tx_timestamp(skb, sockc->tsflags);
  317. if (flags & MSG_CONFIRM)
  318. skb_set_dst_pending_confirm(skb, 1);
  319. skb->transport_header = skb->network_header;
  320. err = -EFAULT;
  321. if (memcpy_from_msg(iph, msg, length))
  322. goto error_free;
  323. iphlen = iph->ihl * 4;
  324. /*
  325. * We don't want to modify the ip header, but we do need to
  326. * be sure that it won't cause problems later along the network
  327. * stack. Specifically we want to make sure that iph->ihl is a
  328. * sane value. If ihl points beyond the length of the buffer passed
  329. * in, reject the frame as invalid
  330. */
  331. err = -EINVAL;
  332. if (iphlen > length)
  333. goto error_free;
  334. if (iphlen >= sizeof(*iph)) {
  335. if (!iph->saddr)
  336. iph->saddr = fl4->saddr;
  337. iph->check = 0;
  338. iph->tot_len = htons(length);
  339. if (!iph->id)
  340. ip_select_ident(net, skb, NULL);
  341. iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
  342. skb->transport_header += iphlen;
  343. if (iph->protocol == IPPROTO_ICMP &&
  344. length >= iphlen + sizeof(struct icmphdr))
  345. icmp_out_count(net, ((struct icmphdr *)
  346. skb_transport_header(skb))->type);
  347. }
  348. err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT,
  349. net, sk, skb, NULL, rt->dst.dev,
  350. dst_output);
  351. if (err > 0)
  352. err = net_xmit_errno(err);
  353. if (err)
  354. goto error;
  355. out:
  356. return 0;
  357. error_free:
  358. kfree_skb(skb);
  359. error:
  360. IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS);
  361. if (err == -ENOBUFS && !inet->recverr)
  362. err = 0;
  363. return err;
  364. }
  365. static int raw_probe_proto_opt(struct raw_frag_vec *rfv, struct flowi4 *fl4)
  366. {
  367. int err;
  368. if (fl4->flowi4_proto != IPPROTO_ICMP)
  369. return 0;
  370. /* We only need the first two bytes. */
  371. rfv->hlen = 2;
  372. err = memcpy_from_msg(rfv->hdr.c, rfv->msg, rfv->hlen);
  373. if (err)
  374. return err;
  375. fl4->fl4_icmp_type = rfv->hdr.icmph.type;
  376. fl4->fl4_icmp_code = rfv->hdr.icmph.code;
  377. return 0;
  378. }
  379. static int raw_getfrag(void *from, char *to, int offset, int len, int odd,
  380. struct sk_buff *skb)
  381. {
  382. struct raw_frag_vec *rfv = from;
  383. if (offset < rfv->hlen) {
  384. int copy = min(rfv->hlen - offset, len);
  385. if (skb->ip_summed == CHECKSUM_PARTIAL)
  386. memcpy(to, rfv->hdr.c + offset, copy);
  387. else
  388. skb->csum = csum_block_add(
  389. skb->csum,
  390. csum_partial_copy_nocheck(rfv->hdr.c + offset,
  391. to, copy),
  392. odd);
  393. odd = 0;
  394. offset += copy;
  395. to += copy;
  396. len -= copy;
  397. if (!len)
  398. return 0;
  399. }
  400. offset -= rfv->hlen;
  401. return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
  402. }
  403. static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
  404. {
  405. struct inet_sock *inet = inet_sk(sk);
  406. struct net *net = sock_net(sk);
  407. struct ipcm_cookie ipc;
  408. struct rtable *rt = NULL;
  409. struct flowi4 fl4;
  410. int free = 0;
  411. __be32 daddr;
  412. __be32 saddr;
  413. u8 tos;
  414. int err;
  415. struct ip_options_data opt_copy;
  416. struct raw_frag_vec rfv;
  417. int hdrincl;
  418. err = -EMSGSIZE;
  419. if (len > 0xFFFF)
  420. goto out;
  421. /* hdrincl should be READ_ONCE(inet->hdrincl)
  422. * but READ_ONCE() doesn't work with bit fields.
  423. * Doing this indirectly yields the same result.
  424. */
  425. hdrincl = inet->hdrincl;
  426. hdrincl = READ_ONCE(hdrincl);
  427. /*
  428. * Check the flags.
  429. */
  430. err = -EOPNOTSUPP;
  431. if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */
  432. goto out; /* compatibility */
  433. /*
  434. * Get and verify the address.
  435. */
  436. if (msg->msg_namelen) {
  437. DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
  438. err = -EINVAL;
  439. if (msg->msg_namelen < sizeof(*usin))
  440. goto out;
  441. if (usin->sin_family != AF_INET) {
  442. pr_info_once("%s: %s forgot to set AF_INET. Fix it!\n",
  443. __func__, current->comm);
  444. err = -EAFNOSUPPORT;
  445. if (usin->sin_family)
  446. goto out;
  447. }
  448. daddr = usin->sin_addr.s_addr;
  449. /* ANK: I did not forget to get protocol from port field.
  450. * I just do not know, who uses this weirdness.
  451. * IP_HDRINCL is much more convenient.
  452. */
  453. } else {
  454. err = -EDESTADDRREQ;
  455. if (sk->sk_state != TCP_ESTABLISHED)
  456. goto out;
  457. daddr = inet->inet_daddr;
  458. }
  459. ipcm_init_sk(&ipc, inet);
  460. /* Keep backward compat */
  461. if (hdrincl)
  462. ipc.protocol = IPPROTO_RAW;
  463. if (msg->msg_controllen) {
  464. err = ip_cmsg_send(sk, msg, &ipc, false);
  465. if (unlikely(err)) {
  466. kfree(ipc.opt);
  467. goto out;
  468. }
  469. if (ipc.opt)
  470. free = 1;
  471. }
  472. saddr = ipc.addr;
  473. ipc.addr = daddr;
  474. if (!ipc.opt) {
  475. struct ip_options_rcu *inet_opt;
  476. rcu_read_lock();
  477. inet_opt = rcu_dereference(inet->inet_opt);
  478. if (inet_opt) {
  479. memcpy(&opt_copy, inet_opt,
  480. sizeof(*inet_opt) + inet_opt->opt.optlen);
  481. ipc.opt = &opt_copy.opt;
  482. }
  483. rcu_read_unlock();
  484. }
  485. if (ipc.opt) {
  486. err = -EINVAL;
  487. /* Linux does not mangle headers on raw sockets,
  488. * so that IP options + IP_HDRINCL is non-sense.
  489. */
  490. if (hdrincl)
  491. goto done;
  492. if (ipc.opt->opt.srr) {
  493. if (!daddr)
  494. goto done;
  495. daddr = ipc.opt->opt.faddr;
  496. }
  497. }
  498. tos = get_rtconn_flags(&ipc, sk);
  499. if (msg->msg_flags & MSG_DONTROUTE)
  500. tos |= RTO_ONLINK;
  501. if (ipv4_is_multicast(daddr)) {
  502. if (!ipc.oif || netif_index_is_l3_master(sock_net(sk), ipc.oif))
  503. ipc.oif = inet->mc_index;
  504. if (!saddr)
  505. saddr = inet->mc_addr;
  506. } else if (!ipc.oif) {
  507. ipc.oif = inet->uc_index;
  508. } else if (ipv4_is_lbcast(daddr) && inet->uc_index) {
  509. /* oif is set, packet is to local broadcast
  510. * and uc_index is set. oif is most likely set
  511. * by sk_bound_dev_if. If uc_index != oif check if the
  512. * oif is an L3 master and uc_index is an L3 slave.
  513. * If so, we want to allow the send using the uc_index.
  514. */
  515. if (ipc.oif != inet->uc_index &&
  516. ipc.oif == l3mdev_master_ifindex_by_index(sock_net(sk),
  517. inet->uc_index)) {
  518. ipc.oif = inet->uc_index;
  519. }
  520. }
  521. flowi4_init_output(&fl4, ipc.oif, ipc.sockc.mark, tos,
  522. RT_SCOPE_UNIVERSE,
  523. hdrincl ? ipc.protocol : sk->sk_protocol,
  524. inet_sk_flowi_flags(sk) |
  525. (hdrincl ? FLOWI_FLAG_KNOWN_NH : 0),
  526. daddr, saddr, 0, 0, sk->sk_uid);
  527. if (!hdrincl) {
  528. rfv.msg = msg;
  529. rfv.hlen = 0;
  530. err = raw_probe_proto_opt(&rfv, &fl4);
  531. if (err)
  532. goto done;
  533. }
  534. security_sk_classify_flow(sk, flowi4_to_flowi_common(&fl4));
  535. rt = ip_route_output_flow(net, &fl4, sk);
  536. if (IS_ERR(rt)) {
  537. err = PTR_ERR(rt);
  538. rt = NULL;
  539. goto done;
  540. }
  541. err = -EACCES;
  542. if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
  543. goto done;
  544. if (msg->msg_flags & MSG_CONFIRM)
  545. goto do_confirm;
  546. back_from_confirm:
  547. if (hdrincl)
  548. err = raw_send_hdrinc(sk, &fl4, msg, len,
  549. &rt, msg->msg_flags, &ipc.sockc);
  550. else {
  551. if (!ipc.addr)
  552. ipc.addr = fl4.daddr;
  553. lock_sock(sk);
  554. err = ip_append_data(sk, &fl4, raw_getfrag,
  555. &rfv, len, 0,
  556. &ipc, &rt, msg->msg_flags);
  557. if (err)
  558. ip_flush_pending_frames(sk);
  559. else if (!(msg->msg_flags & MSG_MORE)) {
  560. err = ip_push_pending_frames(sk, &fl4);
  561. if (err == -ENOBUFS && !inet->recverr)
  562. err = 0;
  563. }
  564. release_sock(sk);
  565. }
  566. done:
  567. if (free)
  568. kfree(ipc.opt);
  569. ip_rt_put(rt);
  570. out:
  571. if (err < 0)
  572. return err;
  573. return len;
  574. do_confirm:
  575. if (msg->msg_flags & MSG_PROBE)
  576. dst_confirm_neigh(&rt->dst, &fl4.daddr);
  577. if (!(msg->msg_flags & MSG_PROBE) || len)
  578. goto back_from_confirm;
  579. err = 0;
  580. goto done;
  581. }
  582. static void raw_close(struct sock *sk, long timeout)
  583. {
  584. /*
  585. * Raw sockets may have direct kernel references. Kill them.
  586. */
  587. ip_ra_control(sk, 0, NULL);
  588. sk_common_release(sk);
  589. }
  590. static void raw_destroy(struct sock *sk)
  591. {
  592. lock_sock(sk);
  593. ip_flush_pending_frames(sk);
  594. release_sock(sk);
  595. }
  596. /* This gets rid of all the nasties in af_inet. -DaveM */
  597. static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
  598. {
  599. struct inet_sock *inet = inet_sk(sk);
  600. struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
  601. struct net *net = sock_net(sk);
  602. u32 tb_id = RT_TABLE_LOCAL;
  603. int ret = -EINVAL;
  604. int chk_addr_ret;
  605. lock_sock(sk);
  606. if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
  607. goto out;
  608. if (sk->sk_bound_dev_if)
  609. tb_id = l3mdev_fib_table_by_index(net,
  610. sk->sk_bound_dev_if) ? : tb_id;
  611. chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
  612. ret = -EADDRNOTAVAIL;
  613. if (!inet_addr_valid_or_nonlocal(net, inet, addr->sin_addr.s_addr,
  614. chk_addr_ret))
  615. goto out;
  616. inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
  617. if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
  618. inet->inet_saddr = 0; /* Use device */
  619. sk_dst_reset(sk);
  620. ret = 0;
  621. out:
  622. release_sock(sk);
  623. return ret;
  624. }
  625. /*
  626. * This should be easy, if there is something there
  627. * we return it, otherwise we block.
  628. */
  629. static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
  630. int flags, int *addr_len)
  631. {
  632. struct inet_sock *inet = inet_sk(sk);
  633. size_t copied = 0;
  634. int err = -EOPNOTSUPP;
  635. DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
  636. struct sk_buff *skb;
  637. if (flags & MSG_OOB)
  638. goto out;
  639. if (flags & MSG_ERRQUEUE) {
  640. err = ip_recv_error(sk, msg, len, addr_len);
  641. goto out;
  642. }
  643. skb = skb_recv_datagram(sk, flags, &err);
  644. if (!skb)
  645. goto out;
  646. copied = skb->len;
  647. if (len < copied) {
  648. msg->msg_flags |= MSG_TRUNC;
  649. copied = len;
  650. }
  651. err = skb_copy_datagram_msg(skb, 0, msg, copied);
  652. if (err)
  653. goto done;
  654. sock_recv_cmsgs(msg, sk, skb);
  655. /* Copy the address. */
  656. if (sin) {
  657. sin->sin_family = AF_INET;
  658. sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
  659. sin->sin_port = 0;
  660. memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
  661. *addr_len = sizeof(*sin);
  662. }
  663. if (inet->cmsg_flags)
  664. ip_cmsg_recv(msg, skb);
  665. if (flags & MSG_TRUNC)
  666. copied = skb->len;
  667. done:
  668. skb_free_datagram(sk, skb);
  669. out:
  670. if (err)
  671. return err;
  672. return copied;
  673. }
  674. static int raw_sk_init(struct sock *sk)
  675. {
  676. struct raw_sock *rp = raw_sk(sk);
  677. if (inet_sk(sk)->inet_num == IPPROTO_ICMP)
  678. memset(&rp->filter, 0, sizeof(rp->filter));
  679. return 0;
  680. }
  681. static int raw_seticmpfilter(struct sock *sk, sockptr_t optval, int optlen)
  682. {
  683. if (optlen > sizeof(struct icmp_filter))
  684. optlen = sizeof(struct icmp_filter);
  685. if (copy_from_sockptr(&raw_sk(sk)->filter, optval, optlen))
  686. return -EFAULT;
  687. return 0;
  688. }
  689. static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
  690. {
  691. int len, ret = -EFAULT;
  692. if (get_user(len, optlen))
  693. goto out;
  694. ret = -EINVAL;
  695. if (len < 0)
  696. goto out;
  697. if (len > sizeof(struct icmp_filter))
  698. len = sizeof(struct icmp_filter);
  699. ret = -EFAULT;
  700. if (put_user(len, optlen) ||
  701. copy_to_user(optval, &raw_sk(sk)->filter, len))
  702. goto out;
  703. ret = 0;
  704. out: return ret;
  705. }
  706. static int do_raw_setsockopt(struct sock *sk, int level, int optname,
  707. sockptr_t optval, unsigned int optlen)
  708. {
  709. if (optname == ICMP_FILTER) {
  710. if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
  711. return -EOPNOTSUPP;
  712. else
  713. return raw_seticmpfilter(sk, optval, optlen);
  714. }
  715. return -ENOPROTOOPT;
  716. }
  717. static int raw_setsockopt(struct sock *sk, int level, int optname,
  718. sockptr_t optval, unsigned int optlen)
  719. {
  720. if (level != SOL_RAW)
  721. return ip_setsockopt(sk, level, optname, optval, optlen);
  722. return do_raw_setsockopt(sk, level, optname, optval, optlen);
  723. }
  724. static int do_raw_getsockopt(struct sock *sk, int level, int optname,
  725. char __user *optval, int __user *optlen)
  726. {
  727. if (optname == ICMP_FILTER) {
  728. if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
  729. return -EOPNOTSUPP;
  730. else
  731. return raw_geticmpfilter(sk, optval, optlen);
  732. }
  733. return -ENOPROTOOPT;
  734. }
  735. static int raw_getsockopt(struct sock *sk, int level, int optname,
  736. char __user *optval, int __user *optlen)
  737. {
  738. if (level != SOL_RAW)
  739. return ip_getsockopt(sk, level, optname, optval, optlen);
  740. return do_raw_getsockopt(sk, level, optname, optval, optlen);
  741. }
  742. static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg)
  743. {
  744. switch (cmd) {
  745. case SIOCOUTQ: {
  746. int amount = sk_wmem_alloc_get(sk);
  747. return put_user(amount, (int __user *)arg);
  748. }
  749. case SIOCINQ: {
  750. struct sk_buff *skb;
  751. int amount = 0;
  752. spin_lock_bh(&sk->sk_receive_queue.lock);
  753. skb = skb_peek(&sk->sk_receive_queue);
  754. if (skb)
  755. amount = skb->len;
  756. spin_unlock_bh(&sk->sk_receive_queue.lock);
  757. return put_user(amount, (int __user *)arg);
  758. }
  759. default:
  760. #ifdef CONFIG_IP_MROUTE
  761. return ipmr_ioctl(sk, cmd, (void __user *)arg);
  762. #else
  763. return -ENOIOCTLCMD;
  764. #endif
  765. }
  766. }
  767. #ifdef CONFIG_COMPAT
  768. static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
  769. {
  770. switch (cmd) {
  771. case SIOCOUTQ:
  772. case SIOCINQ:
  773. return -ENOIOCTLCMD;
  774. default:
  775. #ifdef CONFIG_IP_MROUTE
  776. return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg));
  777. #else
  778. return -ENOIOCTLCMD;
  779. #endif
  780. }
  781. }
  782. #endif
  783. int raw_abort(struct sock *sk, int err)
  784. {
  785. lock_sock(sk);
  786. sk->sk_err = err;
  787. sk_error_report(sk);
  788. __udp_disconnect(sk, 0);
  789. release_sock(sk);
  790. return 0;
  791. }
  792. EXPORT_SYMBOL_GPL(raw_abort);
  793. struct proto raw_prot = {
  794. .name = "RAW",
  795. .owner = THIS_MODULE,
  796. .close = raw_close,
  797. .destroy = raw_destroy,
  798. .connect = ip4_datagram_connect,
  799. .disconnect = __udp_disconnect,
  800. .ioctl = raw_ioctl,
  801. .init = raw_sk_init,
  802. .setsockopt = raw_setsockopt,
  803. .getsockopt = raw_getsockopt,
  804. .sendmsg = raw_sendmsg,
  805. .recvmsg = raw_recvmsg,
  806. .bind = raw_bind,
  807. .backlog_rcv = raw_rcv_skb,
  808. .release_cb = ip4_datagram_release_cb,
  809. .hash = raw_hash_sk,
  810. .unhash = raw_unhash_sk,
  811. .obj_size = sizeof(struct raw_sock),
  812. .useroffset = offsetof(struct raw_sock, filter),
  813. .usersize = sizeof_field(struct raw_sock, filter),
  814. .h.raw_hash = &raw_v4_hashinfo,
  815. #ifdef CONFIG_COMPAT
  816. .compat_ioctl = compat_raw_ioctl,
  817. #endif
  818. .diag_destroy = raw_abort,
  819. };
  820. #ifdef CONFIG_PROC_FS
  821. static struct sock *raw_get_first(struct seq_file *seq, int bucket)
  822. {
  823. struct raw_hashinfo *h = pde_data(file_inode(seq->file));
  824. struct raw_iter_state *state = raw_seq_private(seq);
  825. struct hlist_head *hlist;
  826. struct sock *sk;
  827. for (state->bucket = bucket; state->bucket < RAW_HTABLE_SIZE;
  828. ++state->bucket) {
  829. hlist = &h->ht[state->bucket];
  830. sk_for_each(sk, hlist) {
  831. if (sock_net(sk) == seq_file_net(seq))
  832. return sk;
  833. }
  834. }
  835. return NULL;
  836. }
  837. static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
  838. {
  839. struct raw_iter_state *state = raw_seq_private(seq);
  840. do {
  841. sk = sk_next(sk);
  842. } while (sk && sock_net(sk) != seq_file_net(seq));
  843. if (!sk)
  844. return raw_get_first(seq, state->bucket + 1);
  845. return sk;
  846. }
  847. static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
  848. {
  849. struct sock *sk = raw_get_first(seq, 0);
  850. if (sk)
  851. while (pos && (sk = raw_get_next(seq, sk)) != NULL)
  852. --pos;
  853. return pos ? NULL : sk;
  854. }
  855. void *raw_seq_start(struct seq_file *seq, loff_t *pos)
  856. __acquires(&h->lock)
  857. {
  858. struct raw_hashinfo *h = pde_data(file_inode(seq->file));
  859. spin_lock(&h->lock);
  860. return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
  861. }
  862. EXPORT_SYMBOL_GPL(raw_seq_start);
  863. void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
  864. {
  865. struct sock *sk;
  866. if (v == SEQ_START_TOKEN)
  867. sk = raw_get_first(seq, 0);
  868. else
  869. sk = raw_get_next(seq, v);
  870. ++*pos;
  871. return sk;
  872. }
  873. EXPORT_SYMBOL_GPL(raw_seq_next);
  874. void raw_seq_stop(struct seq_file *seq, void *v)
  875. __releases(&h->lock)
  876. {
  877. struct raw_hashinfo *h = pde_data(file_inode(seq->file));
  878. spin_unlock(&h->lock);
  879. }
  880. EXPORT_SYMBOL_GPL(raw_seq_stop);
  881. static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
  882. {
  883. struct inet_sock *inet = inet_sk(sp);
  884. __be32 dest = inet->inet_daddr,
  885. src = inet->inet_rcv_saddr;
  886. __u16 destp = 0,
  887. srcp = inet->inet_num;
  888. seq_printf(seq, "%4d: %08X:%04X %08X:%04X"
  889. " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n",
  890. i, src, srcp, dest, destp, sp->sk_state,
  891. sk_wmem_alloc_get(sp),
  892. sk_rmem_alloc_get(sp),
  893. 0, 0L, 0,
  894. from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
  895. 0, sock_i_ino(sp),
  896. refcount_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
  897. }
  898. static int raw_seq_show(struct seq_file *seq, void *v)
  899. {
  900. if (v == SEQ_START_TOKEN)
  901. seq_printf(seq, " sl local_address rem_address st tx_queue "
  902. "rx_queue tr tm->when retrnsmt uid timeout "
  903. "inode ref pointer drops\n");
  904. else
  905. raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
  906. return 0;
  907. }
  908. static const struct seq_operations raw_seq_ops = {
  909. .start = raw_seq_start,
  910. .next = raw_seq_next,
  911. .stop = raw_seq_stop,
  912. .show = raw_seq_show,
  913. };
  914. static __net_init int raw_init_net(struct net *net)
  915. {
  916. if (!proc_create_net_data("raw", 0444, net->proc_net, &raw_seq_ops,
  917. sizeof(struct raw_iter_state), &raw_v4_hashinfo))
  918. return -ENOMEM;
  919. return 0;
  920. }
  921. static __net_exit void raw_exit_net(struct net *net)
  922. {
  923. remove_proc_entry("raw", net->proc_net);
  924. }
  925. static __net_initdata struct pernet_operations raw_net_ops = {
  926. .init = raw_init_net,
  927. .exit = raw_exit_net,
  928. };
  929. int __init raw_proc_init(void)
  930. {
  931. return register_pernet_subsys(&raw_net_ops);
  932. }
  933. void __init raw_proc_exit(void)
  934. {
  935. unregister_pernet_subsys(&raw_net_ops);
  936. }
  937. #endif /* CONFIG_PROC_FS */
  938. static void raw_sysctl_init_net(struct net *net)
  939. {
  940. #ifdef CONFIG_NET_L3_MASTER_DEV
  941. net->ipv4.sysctl_raw_l3mdev_accept = 1;
  942. #endif
  943. }
  944. static int __net_init raw_sysctl_init(struct net *net)
  945. {
  946. raw_sysctl_init_net(net);
  947. return 0;
  948. }
  949. static struct pernet_operations __net_initdata raw_sysctl_ops = {
  950. .init = raw_sysctl_init,
  951. };
  952. void __init raw_init(void)
  953. {
  954. raw_sysctl_init_net(&init_net);
  955. if (register_pernet_subsys(&raw_sysctl_ops))
  956. panic("RAW: failed to init sysctl parameters.\n");
  957. }