proc.c 11 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /* SCTP kernel implementation
  3. * Copyright (c) 2003 International Business Machines, Corp.
  4. *
  5. * This file is part of the SCTP kernel implementation
  6. *
  7. * Please send any bug reports or fixes you make to the
  8. * email address(es):
  9. * lksctp developers <[email protected]>
  10. *
  11. * Written or modified by:
  12. * Sridhar Samudrala <[email protected]>
  13. */
  14. #include <linux/types.h>
  15. #include <linux/seq_file.h>
  16. #include <linux/init.h>
  17. #include <linux/export.h>
  18. #include <net/sctp/sctp.h>
  19. #include <net/ip.h> /* for snmp_fold_field */
  20. static const struct snmp_mib sctp_snmp_list[] = {
  21. SNMP_MIB_ITEM("SctpCurrEstab", SCTP_MIB_CURRESTAB),
  22. SNMP_MIB_ITEM("SctpActiveEstabs", SCTP_MIB_ACTIVEESTABS),
  23. SNMP_MIB_ITEM("SctpPassiveEstabs", SCTP_MIB_PASSIVEESTABS),
  24. SNMP_MIB_ITEM("SctpAborteds", SCTP_MIB_ABORTEDS),
  25. SNMP_MIB_ITEM("SctpShutdowns", SCTP_MIB_SHUTDOWNS),
  26. SNMP_MIB_ITEM("SctpOutOfBlues", SCTP_MIB_OUTOFBLUES),
  27. SNMP_MIB_ITEM("SctpChecksumErrors", SCTP_MIB_CHECKSUMERRORS),
  28. SNMP_MIB_ITEM("SctpOutCtrlChunks", SCTP_MIB_OUTCTRLCHUNKS),
  29. SNMP_MIB_ITEM("SctpOutOrderChunks", SCTP_MIB_OUTORDERCHUNKS),
  30. SNMP_MIB_ITEM("SctpOutUnorderChunks", SCTP_MIB_OUTUNORDERCHUNKS),
  31. SNMP_MIB_ITEM("SctpInCtrlChunks", SCTP_MIB_INCTRLCHUNKS),
  32. SNMP_MIB_ITEM("SctpInOrderChunks", SCTP_MIB_INORDERCHUNKS),
  33. SNMP_MIB_ITEM("SctpInUnorderChunks", SCTP_MIB_INUNORDERCHUNKS),
  34. SNMP_MIB_ITEM("SctpFragUsrMsgs", SCTP_MIB_FRAGUSRMSGS),
  35. SNMP_MIB_ITEM("SctpReasmUsrMsgs", SCTP_MIB_REASMUSRMSGS),
  36. SNMP_MIB_ITEM("SctpOutSCTPPacks", SCTP_MIB_OUTSCTPPACKS),
  37. SNMP_MIB_ITEM("SctpInSCTPPacks", SCTP_MIB_INSCTPPACKS),
  38. SNMP_MIB_ITEM("SctpT1InitExpireds", SCTP_MIB_T1_INIT_EXPIREDS),
  39. SNMP_MIB_ITEM("SctpT1CookieExpireds", SCTP_MIB_T1_COOKIE_EXPIREDS),
  40. SNMP_MIB_ITEM("SctpT2ShutdownExpireds", SCTP_MIB_T2_SHUTDOWN_EXPIREDS),
  41. SNMP_MIB_ITEM("SctpT3RtxExpireds", SCTP_MIB_T3_RTX_EXPIREDS),
  42. SNMP_MIB_ITEM("SctpT4RtoExpireds", SCTP_MIB_T4_RTO_EXPIREDS),
  43. SNMP_MIB_ITEM("SctpT5ShutdownGuardExpireds", SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS),
  44. SNMP_MIB_ITEM("SctpDelaySackExpireds", SCTP_MIB_DELAY_SACK_EXPIREDS),
  45. SNMP_MIB_ITEM("SctpAutocloseExpireds", SCTP_MIB_AUTOCLOSE_EXPIREDS),
  46. SNMP_MIB_ITEM("SctpT3Retransmits", SCTP_MIB_T3_RETRANSMITS),
  47. SNMP_MIB_ITEM("SctpPmtudRetransmits", SCTP_MIB_PMTUD_RETRANSMITS),
  48. SNMP_MIB_ITEM("SctpFastRetransmits", SCTP_MIB_FAST_RETRANSMITS),
  49. SNMP_MIB_ITEM("SctpInPktSoftirq", SCTP_MIB_IN_PKT_SOFTIRQ),
  50. SNMP_MIB_ITEM("SctpInPktBacklog", SCTP_MIB_IN_PKT_BACKLOG),
  51. SNMP_MIB_ITEM("SctpInPktDiscards", SCTP_MIB_IN_PKT_DISCARDS),
  52. SNMP_MIB_ITEM("SctpInDataChunkDiscards", SCTP_MIB_IN_DATA_CHUNK_DISCARDS),
  53. SNMP_MIB_SENTINEL
  54. };
  55. /* Display sctp snmp mib statistics(/proc/net/sctp/snmp). */
  56. static int sctp_snmp_seq_show(struct seq_file *seq, void *v)
  57. {
  58. unsigned long buff[SCTP_MIB_MAX];
  59. struct net *net = seq->private;
  60. int i;
  61. memset(buff, 0, sizeof(unsigned long) * SCTP_MIB_MAX);
  62. snmp_get_cpu_field_batch(buff, sctp_snmp_list,
  63. net->sctp.sctp_statistics);
  64. for (i = 0; sctp_snmp_list[i].name; i++)
  65. seq_printf(seq, "%-32s\t%ld\n", sctp_snmp_list[i].name,
  66. buff[i]);
  67. return 0;
  68. }
  69. /* Dump local addresses of an association/endpoint. */
  70. static void sctp_seq_dump_local_addrs(struct seq_file *seq, struct sctp_ep_common *epb)
  71. {
  72. struct sctp_association *asoc;
  73. struct sctp_sockaddr_entry *laddr;
  74. struct sctp_transport *peer;
  75. union sctp_addr *addr, *primary = NULL;
  76. struct sctp_af *af;
  77. if (epb->type == SCTP_EP_TYPE_ASSOCIATION) {
  78. asoc = sctp_assoc(epb);
  79. peer = asoc->peer.primary_path;
  80. if (unlikely(peer == NULL)) {
  81. WARN(1, "Association %p with NULL primary path!\n", asoc);
  82. return;
  83. }
  84. primary = &peer->saddr;
  85. }
  86. rcu_read_lock();
  87. list_for_each_entry_rcu(laddr, &epb->bind_addr.address_list, list) {
  88. if (!laddr->valid)
  89. continue;
  90. addr = &laddr->a;
  91. af = sctp_get_af_specific(addr->sa.sa_family);
  92. if (primary && af->cmp_addr(addr, primary)) {
  93. seq_printf(seq, "*");
  94. }
  95. af->seq_dump_addr(seq, addr);
  96. }
  97. rcu_read_unlock();
  98. }
  99. /* Dump remote addresses of an association. */
  100. static void sctp_seq_dump_remote_addrs(struct seq_file *seq, struct sctp_association *assoc)
  101. {
  102. struct sctp_transport *transport;
  103. union sctp_addr *addr, *primary;
  104. struct sctp_af *af;
  105. primary = &assoc->peer.primary_addr;
  106. list_for_each_entry_rcu(transport, &assoc->peer.transport_addr_list,
  107. transports) {
  108. addr = &transport->ipaddr;
  109. af = sctp_get_af_specific(addr->sa.sa_family);
  110. if (af->cmp_addr(addr, primary)) {
  111. seq_printf(seq, "*");
  112. }
  113. af->seq_dump_addr(seq, addr);
  114. }
  115. }
  116. static void *sctp_eps_seq_start(struct seq_file *seq, loff_t *pos)
  117. {
  118. if (*pos >= sctp_ep_hashsize)
  119. return NULL;
  120. if (*pos < 0)
  121. *pos = 0;
  122. if (*pos == 0)
  123. seq_printf(seq, " ENDPT SOCK STY SST HBKT LPORT UID INODE LADDRS\n");
  124. return (void *)pos;
  125. }
  126. static void sctp_eps_seq_stop(struct seq_file *seq, void *v)
  127. {
  128. }
  129. static void *sctp_eps_seq_next(struct seq_file *seq, void *v, loff_t *pos)
  130. {
  131. if (++*pos >= sctp_ep_hashsize)
  132. return NULL;
  133. return pos;
  134. }
  135. /* Display sctp endpoints (/proc/net/sctp/eps). */
  136. static int sctp_eps_seq_show(struct seq_file *seq, void *v)
  137. {
  138. struct sctp_hashbucket *head;
  139. struct sctp_endpoint *ep;
  140. struct sock *sk;
  141. int hash = *(loff_t *)v;
  142. if (hash >= sctp_ep_hashsize)
  143. return -ENOMEM;
  144. head = &sctp_ep_hashtable[hash];
  145. read_lock_bh(&head->lock);
  146. sctp_for_each_hentry(ep, &head->chain) {
  147. sk = ep->base.sk;
  148. if (!net_eq(sock_net(sk), seq_file_net(seq)))
  149. continue;
  150. seq_printf(seq, "%8pK %8pK %-3d %-3d %-4d %-5d %5u %5lu ", ep, sk,
  151. sctp_sk(sk)->type, sk->sk_state, hash,
  152. ep->base.bind_addr.port,
  153. from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
  154. sock_i_ino(sk));
  155. sctp_seq_dump_local_addrs(seq, &ep->base);
  156. seq_printf(seq, "\n");
  157. }
  158. read_unlock_bh(&head->lock);
  159. return 0;
  160. }
  161. static const struct seq_operations sctp_eps_ops = {
  162. .start = sctp_eps_seq_start,
  163. .next = sctp_eps_seq_next,
  164. .stop = sctp_eps_seq_stop,
  165. .show = sctp_eps_seq_show,
  166. };
  167. struct sctp_ht_iter {
  168. struct seq_net_private p;
  169. struct rhashtable_iter hti;
  170. };
  171. static void *sctp_transport_seq_start(struct seq_file *seq, loff_t *pos)
  172. {
  173. struct sctp_ht_iter *iter = seq->private;
  174. sctp_transport_walk_start(&iter->hti);
  175. return sctp_transport_get_idx(seq_file_net(seq), &iter->hti, *pos);
  176. }
  177. static void sctp_transport_seq_stop(struct seq_file *seq, void *v)
  178. {
  179. struct sctp_ht_iter *iter = seq->private;
  180. if (v && v != SEQ_START_TOKEN) {
  181. struct sctp_transport *transport = v;
  182. sctp_transport_put(transport);
  183. }
  184. sctp_transport_walk_stop(&iter->hti);
  185. }
  186. static void *sctp_transport_seq_next(struct seq_file *seq, void *v, loff_t *pos)
  187. {
  188. struct sctp_ht_iter *iter = seq->private;
  189. if (v && v != SEQ_START_TOKEN) {
  190. struct sctp_transport *transport = v;
  191. sctp_transport_put(transport);
  192. }
  193. ++*pos;
  194. return sctp_transport_get_next(seq_file_net(seq), &iter->hti);
  195. }
  196. /* Display sctp associations (/proc/net/sctp/assocs). */
  197. static int sctp_assocs_seq_show(struct seq_file *seq, void *v)
  198. {
  199. struct sctp_transport *transport;
  200. struct sctp_association *assoc;
  201. struct sctp_ep_common *epb;
  202. struct sock *sk;
  203. if (v == SEQ_START_TOKEN) {
  204. seq_printf(seq, " ASSOC SOCK STY SST ST HBKT "
  205. "ASSOC-ID TX_QUEUE RX_QUEUE UID INODE LPORT "
  206. "RPORT LADDRS <-> RADDRS "
  207. "HBINT INS OUTS MAXRT T1X T2X RTXC "
  208. "wmema wmemq sndbuf rcvbuf\n");
  209. return 0;
  210. }
  211. transport = (struct sctp_transport *)v;
  212. assoc = transport->asoc;
  213. epb = &assoc->base;
  214. sk = epb->sk;
  215. seq_printf(seq,
  216. "%8pK %8pK %-3d %-3d %-2d %-4d "
  217. "%4d %8d %8d %7u %5lu %-5d %5d ",
  218. assoc, sk, sctp_sk(sk)->type, sk->sk_state,
  219. assoc->state, 0,
  220. assoc->assoc_id,
  221. assoc->sndbuf_used,
  222. atomic_read(&assoc->rmem_alloc),
  223. from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
  224. sock_i_ino(sk),
  225. epb->bind_addr.port,
  226. assoc->peer.port);
  227. seq_printf(seq, " ");
  228. sctp_seq_dump_local_addrs(seq, epb);
  229. seq_printf(seq, "<-> ");
  230. sctp_seq_dump_remote_addrs(seq, assoc);
  231. seq_printf(seq, "\t%8lu %5d %5d %4d %4d %4d %8d "
  232. "%8d %8d %8d %8d",
  233. assoc->hbinterval, assoc->stream.incnt,
  234. assoc->stream.outcnt, assoc->max_retrans,
  235. assoc->init_retries, assoc->shutdown_retries,
  236. assoc->rtx_data_chunks,
  237. refcount_read(&sk->sk_wmem_alloc),
  238. READ_ONCE(sk->sk_wmem_queued),
  239. sk->sk_sndbuf,
  240. sk->sk_rcvbuf);
  241. seq_printf(seq, "\n");
  242. return 0;
  243. }
  244. static const struct seq_operations sctp_assoc_ops = {
  245. .start = sctp_transport_seq_start,
  246. .next = sctp_transport_seq_next,
  247. .stop = sctp_transport_seq_stop,
  248. .show = sctp_assocs_seq_show,
  249. };
  250. static int sctp_remaddr_seq_show(struct seq_file *seq, void *v)
  251. {
  252. struct sctp_association *assoc;
  253. struct sctp_transport *transport, *tsp;
  254. if (v == SEQ_START_TOKEN) {
  255. seq_printf(seq, "ADDR ASSOC_ID HB_ACT RTO MAX_PATH_RTX "
  256. "REM_ADDR_RTX START STATE\n");
  257. return 0;
  258. }
  259. transport = (struct sctp_transport *)v;
  260. assoc = transport->asoc;
  261. list_for_each_entry_rcu(tsp, &assoc->peer.transport_addr_list,
  262. transports) {
  263. /*
  264. * The remote address (ADDR)
  265. */
  266. tsp->af_specific->seq_dump_addr(seq, &tsp->ipaddr);
  267. seq_printf(seq, " ");
  268. /*
  269. * The association ID (ASSOC_ID)
  270. */
  271. seq_printf(seq, "%d ", tsp->asoc->assoc_id);
  272. /*
  273. * If the Heartbeat is active (HB_ACT)
  274. * Note: 1 = Active, 0 = Inactive
  275. */
  276. seq_printf(seq, "%d ", timer_pending(&tsp->hb_timer));
  277. /*
  278. * Retransmit time out (RTO)
  279. */
  280. seq_printf(seq, "%lu ", tsp->rto);
  281. /*
  282. * Maximum path retransmit count (PATH_MAX_RTX)
  283. */
  284. seq_printf(seq, "%d ", tsp->pathmaxrxt);
  285. /*
  286. * remote address retransmit count (REM_ADDR_RTX)
  287. * Note: We don't have a way to tally this at the moment
  288. * so lets just leave it as zero for the moment
  289. */
  290. seq_puts(seq, "0 ");
  291. /*
  292. * remote address start time (START). This is also not
  293. * currently implemented, but we can record it with a
  294. * jiffies marker in a subsequent patch
  295. */
  296. seq_puts(seq, "0 ");
  297. /*
  298. * The current state of this destination. I.e.
  299. * SCTP_ACTIVE, SCTP_INACTIVE, ...
  300. */
  301. seq_printf(seq, "%d", tsp->state);
  302. seq_printf(seq, "\n");
  303. }
  304. return 0;
  305. }
  306. static const struct seq_operations sctp_remaddr_ops = {
  307. .start = sctp_transport_seq_start,
  308. .next = sctp_transport_seq_next,
  309. .stop = sctp_transport_seq_stop,
  310. .show = sctp_remaddr_seq_show,
  311. };
  312. /* Set up the proc fs entry for the SCTP protocol. */
  313. int __net_init sctp_proc_init(struct net *net)
  314. {
  315. net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net);
  316. if (!net->sctp.proc_net_sctp)
  317. return -ENOMEM;
  318. if (!proc_create_net_single("snmp", 0444, net->sctp.proc_net_sctp,
  319. sctp_snmp_seq_show, NULL))
  320. goto cleanup;
  321. if (!proc_create_net("eps", 0444, net->sctp.proc_net_sctp,
  322. &sctp_eps_ops, sizeof(struct seq_net_private)))
  323. goto cleanup;
  324. if (!proc_create_net("assocs", 0444, net->sctp.proc_net_sctp,
  325. &sctp_assoc_ops, sizeof(struct sctp_ht_iter)))
  326. goto cleanup;
  327. if (!proc_create_net("remaddr", 0444, net->sctp.proc_net_sctp,
  328. &sctp_remaddr_ops, sizeof(struct sctp_ht_iter)))
  329. goto cleanup;
  330. return 0;
  331. cleanup:
  332. remove_proc_subtree("sctp", net->proc_net);
  333. net->sctp.proc_net_sctp = NULL;
  334. return -ENOMEM;
  335. }