nf_conntrack_netlink.c 95 KB

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  1. /* Connection tracking via netlink socket. Allows for user space
  2. * protocol helpers and general trouble making from userspace.
  3. *
  4. * (C) 2001 by Jay Schulist <jschlst@samba.org>
  5. * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
  6. * (C) 2003 by Patrick Mchardy <kaber@trash.net>
  7. * (C) 2005-2012 by Pablo Neira Ayuso <pablo@netfilter.org>
  8. *
  9. * Initial connection tracking via netlink development funded and
  10. * generally made possible by Network Robots, Inc. (www.networkrobots.com)
  11. *
  12. * Further development of this code funded by Astaro AG (http://www.astaro.com)
  13. *
  14. * This software may be used and distributed according to the terms
  15. * of the GNU General Public License, incorporated herein by reference.
  16. */
  17. #include <linux/init.h>
  18. #include <linux/module.h>
  19. #include <linux/kernel.h>
  20. #include <linux/rculist.h>
  21. #include <linux/rculist_nulls.h>
  22. #include <linux/types.h>
  23. #include <linux/timer.h>
  24. #include <linux/security.h>
  25. #include <linux/skbuff.h>
  26. #include <linux/errno.h>
  27. #include <linux/netlink.h>
  28. #include <linux/spinlock.h>
  29. #include <linux/interrupt.h>
  30. #include <linux/slab.h>
  31. #include <linux/siphash.h>
  32. #include <linux/netfilter.h>
  33. #include <net/netlink.h>
  34. #include <net/sock.h>
  35. #include <net/netfilter/nf_conntrack.h>
  36. #include <net/netfilter/nf_conntrack_core.h>
  37. #include <net/netfilter/nf_conntrack_expect.h>
  38. #include <net/netfilter/nf_conntrack_helper.h>
  39. #include <net/netfilter/nf_conntrack_seqadj.h>
  40. #include <net/netfilter/nf_conntrack_l4proto.h>
  41. #include <net/netfilter/nf_conntrack_tuple.h>
  42. #include <net/netfilter/nf_conntrack_acct.h>
  43. #include <net/netfilter/nf_conntrack_zones.h>
  44. #include <net/netfilter/nf_conntrack_timestamp.h>
  45. #include <net/netfilter/nf_conntrack_labels.h>
  46. #include <net/netfilter/nf_conntrack_synproxy.h>
  47. #if IS_ENABLED(CONFIG_NF_NAT)
  48. #include <net/netfilter/nf_nat.h>
  49. #include <net/netfilter/nf_nat_helper.h>
  50. #endif
  51. #include <linux/netfilter/nfnetlink.h>
  52. #include <linux/netfilter/nfnetlink_conntrack.h>
  53. #include "nf_internals.h"
  54. MODULE_LICENSE("GPL");
  55. static int ctnetlink_dump_tuples_proto(struct sk_buff *skb,
  56. const struct nf_conntrack_tuple *tuple,
  57. const struct nf_conntrack_l4proto *l4proto)
  58. {
  59. int ret = 0;
  60. struct nlattr *nest_parms;
  61. nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO);
  62. if (!nest_parms)
  63. goto nla_put_failure;
  64. if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
  65. goto nla_put_failure;
  66. if (likely(l4proto->tuple_to_nlattr))
  67. ret = l4proto->tuple_to_nlattr(skb, tuple);
  68. nla_nest_end(skb, nest_parms);
  69. return ret;
  70. nla_put_failure:
  71. return -1;
  72. }
  73. static int ipv4_tuple_to_nlattr(struct sk_buff *skb,
  74. const struct nf_conntrack_tuple *tuple)
  75. {
  76. if (nla_put_in_addr(skb, CTA_IP_V4_SRC, tuple->src.u3.ip) ||
  77. nla_put_in_addr(skb, CTA_IP_V4_DST, tuple->dst.u3.ip))
  78. return -EMSGSIZE;
  79. return 0;
  80. }
  81. static int ipv6_tuple_to_nlattr(struct sk_buff *skb,
  82. const struct nf_conntrack_tuple *tuple)
  83. {
  84. if (nla_put_in6_addr(skb, CTA_IP_V6_SRC, &tuple->src.u3.in6) ||
  85. nla_put_in6_addr(skb, CTA_IP_V6_DST, &tuple->dst.u3.in6))
  86. return -EMSGSIZE;
  87. return 0;
  88. }
  89. static int ctnetlink_dump_tuples_ip(struct sk_buff *skb,
  90. const struct nf_conntrack_tuple *tuple)
  91. {
  92. int ret = 0;
  93. struct nlattr *nest_parms;
  94. nest_parms = nla_nest_start(skb, CTA_TUPLE_IP);
  95. if (!nest_parms)
  96. goto nla_put_failure;
  97. switch (tuple->src.l3num) {
  98. case NFPROTO_IPV4:
  99. ret = ipv4_tuple_to_nlattr(skb, tuple);
  100. break;
  101. case NFPROTO_IPV6:
  102. ret = ipv6_tuple_to_nlattr(skb, tuple);
  103. break;
  104. }
  105. nla_nest_end(skb, nest_parms);
  106. return ret;
  107. nla_put_failure:
  108. return -1;
  109. }
  110. static int ctnetlink_dump_tuples(struct sk_buff *skb,
  111. const struct nf_conntrack_tuple *tuple)
  112. {
  113. const struct nf_conntrack_l4proto *l4proto;
  114. int ret;
  115. rcu_read_lock();
  116. ret = ctnetlink_dump_tuples_ip(skb, tuple);
  117. if (ret >= 0) {
  118. l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
  119. ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
  120. }
  121. rcu_read_unlock();
  122. return ret;
  123. }
  124. static int ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
  125. const struct nf_conntrack_zone *zone, int dir)
  126. {
  127. if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
  128. return 0;
  129. if (nla_put_be16(skb, attrtype, htons(zone->id)))
  130. goto nla_put_failure;
  131. return 0;
  132. nla_put_failure:
  133. return -1;
  134. }
  135. static int ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
  136. {
  137. if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
  138. goto nla_put_failure;
  139. return 0;
  140. nla_put_failure:
  141. return -1;
  142. }
  143. static int ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
  144. {
  145. long timeout = nf_ct_expires(ct) / HZ;
  146. if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
  147. goto nla_put_failure;
  148. return 0;
  149. nla_put_failure:
  150. return -1;
  151. }
  152. static int ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
  153. {
  154. const struct nf_conntrack_l4proto *l4proto;
  155. struct nlattr *nest_proto;
  156. int ret;
  157. l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
  158. if (!l4proto->to_nlattr)
  159. return 0;
  160. nest_proto = nla_nest_start(skb, CTA_PROTOINFO);
  161. if (!nest_proto)
  162. goto nla_put_failure;
  163. ret = l4proto->to_nlattr(skb, nest_proto, ct);
  164. nla_nest_end(skb, nest_proto);
  165. return ret;
  166. nla_put_failure:
  167. return -1;
  168. }
  169. static int ctnetlink_dump_helpinfo(struct sk_buff *skb,
  170. const struct nf_conn *ct)
  171. {
  172. struct nlattr *nest_helper;
  173. const struct nf_conn_help *help = nfct_help(ct);
  174. struct nf_conntrack_helper *helper;
  175. if (!help)
  176. return 0;
  177. rcu_read_lock();
  178. helper = rcu_dereference(help->helper);
  179. if (!helper)
  180. goto out;
  181. nest_helper = nla_nest_start(skb, CTA_HELP);
  182. if (!nest_helper)
  183. goto nla_put_failure;
  184. if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
  185. goto nla_put_failure;
  186. if (helper->to_nlattr)
  187. helper->to_nlattr(skb, ct);
  188. nla_nest_end(skb, nest_helper);
  189. out:
  190. rcu_read_unlock();
  191. return 0;
  192. nla_put_failure:
  193. rcu_read_unlock();
  194. return -1;
  195. }
  196. static int
  197. dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
  198. enum ip_conntrack_dir dir, int type)
  199. {
  200. enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
  201. struct nf_conn_counter *counter = acct->counter;
  202. struct nlattr *nest_count;
  203. u64 pkts, bytes;
  204. if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
  205. pkts = atomic64_xchg(&counter[dir].packets, 0);
  206. bytes = atomic64_xchg(&counter[dir].bytes, 0);
  207. } else {
  208. pkts = atomic64_read(&counter[dir].packets);
  209. bytes = atomic64_read(&counter[dir].bytes);
  210. }
  211. nest_count = nla_nest_start(skb, attr);
  212. if (!nest_count)
  213. goto nla_put_failure;
  214. if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts),
  215. CTA_COUNTERS_PAD) ||
  216. nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes),
  217. CTA_COUNTERS_PAD))
  218. goto nla_put_failure;
  219. nla_nest_end(skb, nest_count);
  220. return 0;
  221. nla_put_failure:
  222. return -1;
  223. }
  224. static int
  225. ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
  226. {
  227. struct nf_conn_acct *acct = nf_conn_acct_find(ct);
  228. if (!acct)
  229. return 0;
  230. if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
  231. return -1;
  232. if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
  233. return -1;
  234. return 0;
  235. }
  236. static int
  237. ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
  238. {
  239. struct nlattr *nest_count;
  240. const struct nf_conn_tstamp *tstamp;
  241. tstamp = nf_conn_tstamp_find(ct);
  242. if (!tstamp)
  243. return 0;
  244. nest_count = nla_nest_start(skb, CTA_TIMESTAMP);
  245. if (!nest_count)
  246. goto nla_put_failure;
  247. if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start),
  248. CTA_TIMESTAMP_PAD) ||
  249. (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
  250. cpu_to_be64(tstamp->stop),
  251. CTA_TIMESTAMP_PAD)))
  252. goto nla_put_failure;
  253. nla_nest_end(skb, nest_count);
  254. return 0;
  255. nla_put_failure:
  256. return -1;
  257. }
  258. #ifdef CONFIG_NF_CONNTRACK_MARK
  259. static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
  260. {
  261. if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
  262. goto nla_put_failure;
  263. return 0;
  264. nla_put_failure:
  265. return -1;
  266. }
  267. #else
  268. #define ctnetlink_dump_mark(a, b) (0)
  269. #endif
  270. #ifdef CONFIG_NF_CONNTRACK_SECMARK
  271. static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
  272. {
  273. struct nlattr *nest_secctx;
  274. int len, ret;
  275. char *secctx;
  276. ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
  277. if (ret)
  278. return 0;
  279. ret = -1;
  280. nest_secctx = nla_nest_start(skb, CTA_SECCTX);
  281. if (!nest_secctx)
  282. goto nla_put_failure;
  283. if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
  284. goto nla_put_failure;
  285. nla_nest_end(skb, nest_secctx);
  286. ret = 0;
  287. nla_put_failure:
  288. security_release_secctx(secctx, len);
  289. return ret;
  290. }
  291. #else
  292. #define ctnetlink_dump_secctx(a, b) (0)
  293. #endif
  294. #ifdef CONFIG_NF_CONNTRACK_LABELS
  295. static inline int ctnetlink_label_size(const struct nf_conn *ct)
  296. {
  297. struct nf_conn_labels *labels = nf_ct_labels_find(ct);
  298. if (!labels)
  299. return 0;
  300. return nla_total_size(sizeof(labels->bits));
  301. }
  302. static int
  303. ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
  304. {
  305. struct nf_conn_labels *labels = nf_ct_labels_find(ct);
  306. unsigned int i;
  307. if (!labels)
  308. return 0;
  309. i = 0;
  310. do {
  311. if (labels->bits[i] != 0)
  312. return nla_put(skb, CTA_LABELS, sizeof(labels->bits),
  313. labels->bits);
  314. i++;
  315. } while (i < ARRAY_SIZE(labels->bits));
  316. return 0;
  317. }
  318. #else
  319. #define ctnetlink_dump_labels(a, b) (0)
  320. #define ctnetlink_label_size(a) (0)
  321. #endif
  322. #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
  323. static int ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
  324. {
  325. struct nlattr *nest_parms;
  326. if (!(ct->status & IPS_EXPECTED))
  327. return 0;
  328. nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER);
  329. if (!nest_parms)
  330. goto nla_put_failure;
  331. if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
  332. goto nla_put_failure;
  333. nla_nest_end(skb, nest_parms);
  334. return 0;
  335. nla_put_failure:
  336. return -1;
  337. }
  338. static int
  339. dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
  340. {
  341. struct nlattr *nest_parms;
  342. nest_parms = nla_nest_start(skb, type);
  343. if (!nest_parms)
  344. goto nla_put_failure;
  345. if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
  346. htonl(seq->correction_pos)) ||
  347. nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
  348. htonl(seq->offset_before)) ||
  349. nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
  350. htonl(seq->offset_after)))
  351. goto nla_put_failure;
  352. nla_nest_end(skb, nest_parms);
  353. return 0;
  354. nla_put_failure:
  355. return -1;
  356. }
  357. static int ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, struct nf_conn *ct)
  358. {
  359. struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
  360. struct nf_ct_seqadj *seq;
  361. if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
  362. return 0;
  363. spin_lock_bh(&ct->lock);
  364. seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
  365. if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
  366. goto err;
  367. seq = &seqadj->seq[IP_CT_DIR_REPLY];
  368. if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
  369. goto err;
  370. spin_unlock_bh(&ct->lock);
  371. return 0;
  372. err:
  373. spin_unlock_bh(&ct->lock);
  374. return -1;
  375. }
  376. static int ctnetlink_dump_ct_synproxy(struct sk_buff *skb, struct nf_conn *ct)
  377. {
  378. struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
  379. struct nlattr *nest_parms;
  380. if (!synproxy)
  381. return 0;
  382. nest_parms = nla_nest_start(skb, CTA_SYNPROXY);
  383. if (!nest_parms)
  384. goto nla_put_failure;
  385. if (nla_put_be32(skb, CTA_SYNPROXY_ISN, htonl(synproxy->isn)) ||
  386. nla_put_be32(skb, CTA_SYNPROXY_ITS, htonl(synproxy->its)) ||
  387. nla_put_be32(skb, CTA_SYNPROXY_TSOFF, htonl(synproxy->tsoff)))
  388. goto nla_put_failure;
  389. nla_nest_end(skb, nest_parms);
  390. return 0;
  391. nla_put_failure:
  392. return -1;
  393. }
  394. static int ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
  395. {
  396. __be32 id = (__force __be32)nf_ct_get_id(ct);
  397. if (nla_put_be32(skb, CTA_ID, id))
  398. goto nla_put_failure;
  399. return 0;
  400. nla_put_failure:
  401. return -1;
  402. }
  403. static int ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
  404. {
  405. if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
  406. goto nla_put_failure;
  407. return 0;
  408. nla_put_failure:
  409. return -1;
  410. }
  411. /* all these functions access ct->ext. Caller must either hold a reference
  412. * on ct or prevent its deletion by holding either the bucket spinlock or
  413. * pcpu dying list lock.
  414. */
  415. static int ctnetlink_dump_extinfo(struct sk_buff *skb,
  416. struct nf_conn *ct, u32 type)
  417. {
  418. if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
  419. ctnetlink_dump_timestamp(skb, ct) < 0 ||
  420. ctnetlink_dump_helpinfo(skb, ct) < 0 ||
  421. ctnetlink_dump_labels(skb, ct) < 0 ||
  422. ctnetlink_dump_ct_seq_adj(skb, ct) < 0 ||
  423. ctnetlink_dump_ct_synproxy(skb, ct) < 0)
  424. return -1;
  425. return 0;
  426. }
  427. static int ctnetlink_dump_info(struct sk_buff *skb, struct nf_conn *ct)
  428. {
  429. if (ctnetlink_dump_status(skb, ct) < 0 ||
  430. ctnetlink_dump_mark(skb, ct) < 0 ||
  431. ctnetlink_dump_secctx(skb, ct) < 0 ||
  432. ctnetlink_dump_id(skb, ct) < 0 ||
  433. ctnetlink_dump_use(skb, ct) < 0 ||
  434. ctnetlink_dump_master(skb, ct) < 0)
  435. return -1;
  436. if (!test_bit(IPS_OFFLOAD_BIT, &ct->status) &&
  437. (ctnetlink_dump_timeout(skb, ct) < 0 ||
  438. ctnetlink_dump_protoinfo(skb, ct) < 0))
  439. return -1;
  440. return 0;
  441. }
  442. static int
  443. ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
  444. struct nf_conn *ct, bool extinfo, unsigned int flags)
  445. {
  446. const struct nf_conntrack_zone *zone;
  447. struct nlmsghdr *nlh;
  448. struct nfgenmsg *nfmsg;
  449. struct nlattr *nest_parms;
  450. unsigned int event;
  451. if (portid)
  452. flags |= NLM_F_MULTI;
  453. event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_NEW);
  454. nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
  455. if (nlh == NULL)
  456. goto nlmsg_failure;
  457. nfmsg = nlmsg_data(nlh);
  458. nfmsg->nfgen_family = nf_ct_l3num(ct);
  459. nfmsg->version = NFNETLINK_V0;
  460. nfmsg->res_id = 0;
  461. zone = nf_ct_zone(ct);
  462. nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
  463. if (!nest_parms)
  464. goto nla_put_failure;
  465. if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
  466. goto nla_put_failure;
  467. if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
  468. NF_CT_ZONE_DIR_ORIG) < 0)
  469. goto nla_put_failure;
  470. nla_nest_end(skb, nest_parms);
  471. nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
  472. if (!nest_parms)
  473. goto nla_put_failure;
  474. if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
  475. goto nla_put_failure;
  476. if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
  477. NF_CT_ZONE_DIR_REPL) < 0)
  478. goto nla_put_failure;
  479. nla_nest_end(skb, nest_parms);
  480. if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
  481. NF_CT_DEFAULT_ZONE_DIR) < 0)
  482. goto nla_put_failure;
  483. if (ctnetlink_dump_info(skb, ct) < 0)
  484. goto nla_put_failure;
  485. if (extinfo && ctnetlink_dump_extinfo(skb, ct, type) < 0)
  486. goto nla_put_failure;
  487. nlmsg_end(skb, nlh);
  488. return skb->len;
  489. nlmsg_failure:
  490. nla_put_failure:
  491. nlmsg_cancel(skb, nlh);
  492. return -1;
  493. }
  494. static const struct nla_policy cta_ip_nla_policy[CTA_IP_MAX + 1] = {
  495. [CTA_IP_V4_SRC] = { .type = NLA_U32 },
  496. [CTA_IP_V4_DST] = { .type = NLA_U32 },
  497. [CTA_IP_V6_SRC] = { .len = sizeof(__be32) * 4 },
  498. [CTA_IP_V6_DST] = { .len = sizeof(__be32) * 4 },
  499. };
  500. #if defined(CONFIG_NETFILTER_NETLINK_GLUE_CT) || defined(CONFIG_NF_CONNTRACK_EVENTS)
  501. static size_t ctnetlink_proto_size(const struct nf_conn *ct)
  502. {
  503. const struct nf_conntrack_l4proto *l4proto;
  504. size_t len, len4 = 0;
  505. len = nla_policy_len(cta_ip_nla_policy, CTA_IP_MAX + 1);
  506. len *= 3u; /* ORIG, REPLY, MASTER */
  507. l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
  508. len += l4proto->nlattr_size;
  509. if (l4proto->nlattr_tuple_size) {
  510. len4 = l4proto->nlattr_tuple_size();
  511. len4 *= 3u; /* ORIG, REPLY, MASTER */
  512. }
  513. return len + len4;
  514. }
  515. #endif
  516. static inline size_t ctnetlink_acct_size(const struct nf_conn *ct)
  517. {
  518. if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
  519. return 0;
  520. return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
  521. + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
  522. + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
  523. ;
  524. }
  525. static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
  526. {
  527. #ifdef CONFIG_NF_CONNTRACK_SECMARK
  528. int len, ret;
  529. ret = security_secid_to_secctx(ct->secmark, NULL, &len);
  530. if (ret)
  531. return 0;
  532. return nla_total_size(0) /* CTA_SECCTX */
  533. + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
  534. #else
  535. return 0;
  536. #endif
  537. }
  538. static inline size_t ctnetlink_timestamp_size(const struct nf_conn *ct)
  539. {
  540. #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
  541. if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
  542. return 0;
  543. return nla_total_size(0) + 2 * nla_total_size_64bit(sizeof(uint64_t));
  544. #else
  545. return 0;
  546. #endif
  547. }
  548. #ifdef CONFIG_NF_CONNTRACK_EVENTS
  549. static size_t ctnetlink_nlmsg_size(const struct nf_conn *ct)
  550. {
  551. return NLMSG_ALIGN(sizeof(struct nfgenmsg))
  552. + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
  553. + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
  554. + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
  555. + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
  556. + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
  557. + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
  558. + ctnetlink_acct_size(ct)
  559. + ctnetlink_timestamp_size(ct)
  560. + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
  561. + nla_total_size(0) /* CTA_PROTOINFO */
  562. + nla_total_size(0) /* CTA_HELP */
  563. + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
  564. + ctnetlink_secctx_size(ct)
  565. #if IS_ENABLED(CONFIG_NF_NAT)
  566. + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
  567. + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
  568. #endif
  569. #ifdef CONFIG_NF_CONNTRACK_MARK
  570. + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
  571. #endif
  572. #ifdef CONFIG_NF_CONNTRACK_ZONES
  573. + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
  574. #endif
  575. + ctnetlink_proto_size(ct)
  576. + ctnetlink_label_size(ct)
  577. ;
  578. }
  579. static int
  580. ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
  581. {
  582. const struct nf_conntrack_zone *zone;
  583. struct net *net;
  584. struct nlmsghdr *nlh;
  585. struct nfgenmsg *nfmsg;
  586. struct nlattr *nest_parms;
  587. struct nf_conn *ct = item->ct;
  588. struct sk_buff *skb;
  589. unsigned int type;
  590. unsigned int flags = 0, group;
  591. int err;
  592. if (events & (1 << IPCT_DESTROY)) {
  593. type = IPCTNL_MSG_CT_DELETE;
  594. group = NFNLGRP_CONNTRACK_DESTROY;
  595. } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
  596. type = IPCTNL_MSG_CT_NEW;
  597. flags = NLM_F_CREATE|NLM_F_EXCL;
  598. group = NFNLGRP_CONNTRACK_NEW;
  599. } else if (events) {
  600. type = IPCTNL_MSG_CT_NEW;
  601. group = NFNLGRP_CONNTRACK_UPDATE;
  602. } else
  603. return 0;
  604. net = nf_ct_net(ct);
  605. if (!item->report && !nfnetlink_has_listeners(net, group))
  606. return 0;
  607. skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
  608. if (skb == NULL)
  609. goto errout;
  610. type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, type);
  611. nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
  612. if (nlh == NULL)
  613. goto nlmsg_failure;
  614. nfmsg = nlmsg_data(nlh);
  615. nfmsg->nfgen_family = nf_ct_l3num(ct);
  616. nfmsg->version = NFNETLINK_V0;
  617. nfmsg->res_id = 0;
  618. zone = nf_ct_zone(ct);
  619. nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
  620. if (!nest_parms)
  621. goto nla_put_failure;
  622. if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
  623. goto nla_put_failure;
  624. if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
  625. NF_CT_ZONE_DIR_ORIG) < 0)
  626. goto nla_put_failure;
  627. nla_nest_end(skb, nest_parms);
  628. nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
  629. if (!nest_parms)
  630. goto nla_put_failure;
  631. if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
  632. goto nla_put_failure;
  633. if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
  634. NF_CT_ZONE_DIR_REPL) < 0)
  635. goto nla_put_failure;
  636. nla_nest_end(skb, nest_parms);
  637. if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
  638. NF_CT_DEFAULT_ZONE_DIR) < 0)
  639. goto nla_put_failure;
  640. if (ctnetlink_dump_id(skb, ct) < 0)
  641. goto nla_put_failure;
  642. if (ctnetlink_dump_status(skb, ct) < 0)
  643. goto nla_put_failure;
  644. if (events & (1 << IPCT_DESTROY)) {
  645. if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
  646. ctnetlink_dump_timestamp(skb, ct) < 0)
  647. goto nla_put_failure;
  648. } else {
  649. if (ctnetlink_dump_timeout(skb, ct) < 0)
  650. goto nla_put_failure;
  651. if (events & (1 << IPCT_PROTOINFO)
  652. && ctnetlink_dump_protoinfo(skb, ct) < 0)
  653. goto nla_put_failure;
  654. if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
  655. && ctnetlink_dump_helpinfo(skb, ct) < 0)
  656. goto nla_put_failure;
  657. #ifdef CONFIG_NF_CONNTRACK_SECMARK
  658. if ((events & (1 << IPCT_SECMARK) || ct->secmark)
  659. && ctnetlink_dump_secctx(skb, ct) < 0)
  660. goto nla_put_failure;
  661. #endif
  662. if (events & (1 << IPCT_LABEL) &&
  663. ctnetlink_dump_labels(skb, ct) < 0)
  664. goto nla_put_failure;
  665. if (events & (1 << IPCT_RELATED) &&
  666. ctnetlink_dump_master(skb, ct) < 0)
  667. goto nla_put_failure;
  668. if (events & (1 << IPCT_SEQADJ) &&
  669. ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
  670. goto nla_put_failure;
  671. if (events & (1 << IPCT_SYNPROXY) &&
  672. ctnetlink_dump_ct_synproxy(skb, ct) < 0)
  673. goto nla_put_failure;
  674. }
  675. #ifdef CONFIG_NF_CONNTRACK_MARK
  676. if ((events & (1 << IPCT_MARK) || ct->mark)
  677. && ctnetlink_dump_mark(skb, ct) < 0)
  678. goto nla_put_failure;
  679. #endif
  680. nlmsg_end(skb, nlh);
  681. err = nfnetlink_send(skb, net, item->portid, group, item->report,
  682. GFP_ATOMIC);
  683. if (err == -ENOBUFS || err == -EAGAIN)
  684. return -ENOBUFS;
  685. return 0;
  686. nla_put_failure:
  687. nlmsg_cancel(skb, nlh);
  688. nlmsg_failure:
  689. kfree_skb(skb);
  690. errout:
  691. if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
  692. return -ENOBUFS;
  693. return 0;
  694. }
  695. #endif /* CONFIG_NF_CONNTRACK_EVENTS */
  696. static int ctnetlink_done(struct netlink_callback *cb)
  697. {
  698. if (cb->args[1])
  699. nf_ct_put((struct nf_conn *)cb->args[1]);
  700. kfree(cb->data);
  701. return 0;
  702. }
  703. struct ctnetlink_filter {
  704. u8 family;
  705. u_int32_t orig_flags;
  706. u_int32_t reply_flags;
  707. struct nf_conntrack_tuple orig;
  708. struct nf_conntrack_tuple reply;
  709. struct nf_conntrack_zone zone;
  710. struct {
  711. u_int32_t val;
  712. u_int32_t mask;
  713. } mark;
  714. };
  715. static const struct nla_policy cta_filter_nla_policy[CTA_FILTER_MAX + 1] = {
  716. [CTA_FILTER_ORIG_FLAGS] = { .type = NLA_U32 },
  717. [CTA_FILTER_REPLY_FLAGS] = { .type = NLA_U32 },
  718. };
  719. static int ctnetlink_parse_filter(const struct nlattr *attr,
  720. struct ctnetlink_filter *filter)
  721. {
  722. struct nlattr *tb[CTA_FILTER_MAX + 1];
  723. int ret = 0;
  724. ret = nla_parse_nested(tb, CTA_FILTER_MAX, attr, cta_filter_nla_policy,
  725. NULL);
  726. if (ret)
  727. return ret;
  728. if (tb[CTA_FILTER_ORIG_FLAGS]) {
  729. filter->orig_flags = nla_get_u32(tb[CTA_FILTER_ORIG_FLAGS]);
  730. if (filter->orig_flags & ~CTA_FILTER_F_ALL)
  731. return -EOPNOTSUPP;
  732. }
  733. if (tb[CTA_FILTER_REPLY_FLAGS]) {
  734. filter->reply_flags = nla_get_u32(tb[CTA_FILTER_REPLY_FLAGS]);
  735. if (filter->reply_flags & ~CTA_FILTER_F_ALL)
  736. return -EOPNOTSUPP;
  737. }
  738. return 0;
  739. }
  740. static int ctnetlink_parse_zone(const struct nlattr *attr,
  741. struct nf_conntrack_zone *zone);
  742. static int ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
  743. struct nf_conntrack_tuple *tuple,
  744. u32 type, u_int8_t l3num,
  745. struct nf_conntrack_zone *zone,
  746. u_int32_t flags);
  747. static struct ctnetlink_filter *
  748. ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
  749. {
  750. struct ctnetlink_filter *filter;
  751. int err;
  752. #ifndef CONFIG_NF_CONNTRACK_MARK
  753. if (cda[CTA_MARK] || cda[CTA_MARK_MASK])
  754. return ERR_PTR(-EOPNOTSUPP);
  755. #endif
  756. filter = kzalloc(sizeof(*filter), GFP_KERNEL);
  757. if (filter == NULL)
  758. return ERR_PTR(-ENOMEM);
  759. filter->family = family;
  760. #ifdef CONFIG_NF_CONNTRACK_MARK
  761. if (cda[CTA_MARK]) {
  762. filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
  763. if (cda[CTA_MARK_MASK])
  764. filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
  765. else
  766. filter->mark.mask = 0xffffffff;
  767. } else if (cda[CTA_MARK_MASK]) {
  768. err = -EINVAL;
  769. goto err_filter;
  770. }
  771. #endif
  772. if (!cda[CTA_FILTER])
  773. return filter;
  774. err = ctnetlink_parse_zone(cda[CTA_ZONE], &filter->zone);
  775. if (err < 0)
  776. goto err_filter;
  777. err = ctnetlink_parse_filter(cda[CTA_FILTER], filter);
  778. if (err < 0)
  779. goto err_filter;
  780. if (filter->orig_flags) {
  781. if (!cda[CTA_TUPLE_ORIG]) {
  782. err = -EINVAL;
  783. goto err_filter;
  784. }
  785. err = ctnetlink_parse_tuple_filter(cda, &filter->orig,
  786. CTA_TUPLE_ORIG,
  787. filter->family,
  788. &filter->zone,
  789. filter->orig_flags);
  790. if (err < 0)
  791. goto err_filter;
  792. }
  793. if (filter->reply_flags) {
  794. if (!cda[CTA_TUPLE_REPLY]) {
  795. err = -EINVAL;
  796. goto err_filter;
  797. }
  798. err = ctnetlink_parse_tuple_filter(cda, &filter->reply,
  799. CTA_TUPLE_REPLY,
  800. filter->family,
  801. &filter->zone,
  802. filter->reply_flags);
  803. if (err < 0)
  804. goto err_filter;
  805. }
  806. return filter;
  807. err_filter:
  808. kfree(filter);
  809. return ERR_PTR(err);
  810. }
  811. static bool ctnetlink_needs_filter(u8 family, const struct nlattr * const *cda)
  812. {
  813. return family || cda[CTA_MARK] || cda[CTA_FILTER];
  814. }
  815. static int ctnetlink_start(struct netlink_callback *cb)
  816. {
  817. const struct nlattr * const *cda = cb->data;
  818. struct ctnetlink_filter *filter = NULL;
  819. struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
  820. u8 family = nfmsg->nfgen_family;
  821. if (ctnetlink_needs_filter(family, cda)) {
  822. filter = ctnetlink_alloc_filter(cda, family);
  823. if (IS_ERR(filter))
  824. return PTR_ERR(filter);
  825. }
  826. cb->data = filter;
  827. return 0;
  828. }
  829. static int ctnetlink_filter_match_tuple(struct nf_conntrack_tuple *filter_tuple,
  830. struct nf_conntrack_tuple *ct_tuple,
  831. u_int32_t flags, int family)
  832. {
  833. switch (family) {
  834. case NFPROTO_IPV4:
  835. if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
  836. filter_tuple->src.u3.ip != ct_tuple->src.u3.ip)
  837. return 0;
  838. if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
  839. filter_tuple->dst.u3.ip != ct_tuple->dst.u3.ip)
  840. return 0;
  841. break;
  842. case NFPROTO_IPV6:
  843. if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
  844. !ipv6_addr_cmp(&filter_tuple->src.u3.in6,
  845. &ct_tuple->src.u3.in6))
  846. return 0;
  847. if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
  848. !ipv6_addr_cmp(&filter_tuple->dst.u3.in6,
  849. &ct_tuple->dst.u3.in6))
  850. return 0;
  851. break;
  852. }
  853. if ((flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) &&
  854. filter_tuple->dst.protonum != ct_tuple->dst.protonum)
  855. return 0;
  856. switch (ct_tuple->dst.protonum) {
  857. case IPPROTO_TCP:
  858. case IPPROTO_UDP:
  859. if ((flags & CTA_FILTER_FLAG(CTA_PROTO_SRC_PORT)) &&
  860. filter_tuple->src.u.tcp.port != ct_tuple->src.u.tcp.port)
  861. return 0;
  862. if ((flags & CTA_FILTER_FLAG(CTA_PROTO_DST_PORT)) &&
  863. filter_tuple->dst.u.tcp.port != ct_tuple->dst.u.tcp.port)
  864. return 0;
  865. break;
  866. case IPPROTO_ICMP:
  867. if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_TYPE)) &&
  868. filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
  869. return 0;
  870. if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_CODE)) &&
  871. filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
  872. return 0;
  873. if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_ID)) &&
  874. filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
  875. return 0;
  876. break;
  877. case IPPROTO_ICMPV6:
  878. if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_TYPE)) &&
  879. filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
  880. return 0;
  881. if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_CODE)) &&
  882. filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
  883. return 0;
  884. if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_ID)) &&
  885. filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
  886. return 0;
  887. break;
  888. }
  889. return 1;
  890. }
  891. static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
  892. {
  893. struct ctnetlink_filter *filter = data;
  894. struct nf_conntrack_tuple *tuple;
  895. if (filter == NULL)
  896. goto out;
  897. /* Match entries of a given L3 protocol number.
  898. * If it is not specified, ie. l3proto == 0,
  899. * then match everything.
  900. */
  901. if (filter->family && nf_ct_l3num(ct) != filter->family)
  902. goto ignore_entry;
  903. if (filter->orig_flags) {
  904. tuple = nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL);
  905. if (!ctnetlink_filter_match_tuple(&filter->orig, tuple,
  906. filter->orig_flags,
  907. filter->family))
  908. goto ignore_entry;
  909. }
  910. if (filter->reply_flags) {
  911. tuple = nf_ct_tuple(ct, IP_CT_DIR_REPLY);
  912. if (!ctnetlink_filter_match_tuple(&filter->reply, tuple,
  913. filter->reply_flags,
  914. filter->family))
  915. goto ignore_entry;
  916. }
  917. #ifdef CONFIG_NF_CONNTRACK_MARK
  918. if ((ct->mark & filter->mark.mask) != filter->mark.val)
  919. goto ignore_entry;
  920. #endif
  921. out:
  922. return 1;
  923. ignore_entry:
  924. return 0;
  925. }
  926. static int
  927. ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
  928. {
  929. unsigned int flags = cb->data ? NLM_F_DUMP_FILTERED : 0;
  930. struct net *net = sock_net(skb->sk);
  931. struct nf_conn *ct, *last;
  932. struct nf_conntrack_tuple_hash *h;
  933. struct hlist_nulls_node *n;
  934. struct nf_conn *nf_ct_evict[8];
  935. int res, i;
  936. spinlock_t *lockp;
  937. last = (struct nf_conn *)cb->args[1];
  938. i = 0;
  939. local_bh_disable();
  940. for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
  941. restart:
  942. while (i) {
  943. i--;
  944. if (nf_ct_should_gc(nf_ct_evict[i]))
  945. nf_ct_kill(nf_ct_evict[i]);
  946. nf_ct_put(nf_ct_evict[i]);
  947. }
  948. lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
  949. nf_conntrack_lock(lockp);
  950. if (cb->args[0] >= nf_conntrack_htable_size) {
  951. spin_unlock(lockp);
  952. goto out;
  953. }
  954. hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
  955. hnnode) {
  956. if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
  957. continue;
  958. ct = nf_ct_tuplehash_to_ctrack(h);
  959. if (nf_ct_is_expired(ct)) {
  960. if (i < ARRAY_SIZE(nf_ct_evict) &&
  961. atomic_inc_not_zero(&ct->ct_general.use))
  962. nf_ct_evict[i++] = ct;
  963. continue;
  964. }
  965. if (!net_eq(net, nf_ct_net(ct)))
  966. continue;
  967. if (cb->args[1]) {
  968. if (ct != last)
  969. continue;
  970. cb->args[1] = 0;
  971. }
  972. if (!ctnetlink_filter_match(ct, cb->data))
  973. continue;
  974. res =
  975. ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
  976. cb->nlh->nlmsg_seq,
  977. NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
  978. ct, true, flags);
  979. if (res < 0) {
  980. nf_conntrack_get(&ct->ct_general);
  981. cb->args[1] = (unsigned long)ct;
  982. spin_unlock(lockp);
  983. goto out;
  984. }
  985. }
  986. spin_unlock(lockp);
  987. if (cb->args[1]) {
  988. cb->args[1] = 0;
  989. goto restart;
  990. }
  991. }
  992. out:
  993. local_bh_enable();
  994. if (last) {
  995. /* nf ct hash resize happened, now clear the leftover. */
  996. if ((struct nf_conn *)cb->args[1] == last)
  997. cb->args[1] = 0;
  998. nf_ct_put(last);
  999. }
  1000. while (i) {
  1001. i--;
  1002. if (nf_ct_should_gc(nf_ct_evict[i]))
  1003. nf_ct_kill(nf_ct_evict[i]);
  1004. nf_ct_put(nf_ct_evict[i]);
  1005. }
  1006. return skb->len;
  1007. }
  1008. static int ipv4_nlattr_to_tuple(struct nlattr *tb[],
  1009. struct nf_conntrack_tuple *t,
  1010. u_int32_t flags)
  1011. {
  1012. if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
  1013. if (!tb[CTA_IP_V4_SRC])
  1014. return -EINVAL;
  1015. t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]);
  1016. }
  1017. if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
  1018. if (!tb[CTA_IP_V4_DST])
  1019. return -EINVAL;
  1020. t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]);
  1021. }
  1022. return 0;
  1023. }
  1024. static int ipv6_nlattr_to_tuple(struct nlattr *tb[],
  1025. struct nf_conntrack_tuple *t,
  1026. u_int32_t flags)
  1027. {
  1028. if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
  1029. if (!tb[CTA_IP_V6_SRC])
  1030. return -EINVAL;
  1031. t->src.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_SRC]);
  1032. }
  1033. if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
  1034. if (!tb[CTA_IP_V6_DST])
  1035. return -EINVAL;
  1036. t->dst.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_DST]);
  1037. }
  1038. return 0;
  1039. }
  1040. static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
  1041. struct nf_conntrack_tuple *tuple,
  1042. u_int32_t flags)
  1043. {
  1044. struct nlattr *tb[CTA_IP_MAX+1];
  1045. int ret = 0;
  1046. ret = nla_parse_nested_deprecated(tb, CTA_IP_MAX, attr, NULL, NULL);
  1047. if (ret < 0)
  1048. return ret;
  1049. ret = nla_validate_nested_deprecated(attr, CTA_IP_MAX,
  1050. cta_ip_nla_policy, NULL);
  1051. if (ret)
  1052. return ret;
  1053. switch (tuple->src.l3num) {
  1054. case NFPROTO_IPV4:
  1055. ret = ipv4_nlattr_to_tuple(tb, tuple, flags);
  1056. break;
  1057. case NFPROTO_IPV6:
  1058. ret = ipv6_nlattr_to_tuple(tb, tuple, flags);
  1059. break;
  1060. }
  1061. return ret;
  1062. }
  1063. static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
  1064. [CTA_PROTO_NUM] = { .type = NLA_U8 },
  1065. };
  1066. static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
  1067. struct nf_conntrack_tuple *tuple,
  1068. u_int32_t flags)
  1069. {
  1070. const struct nf_conntrack_l4proto *l4proto;
  1071. struct nlattr *tb[CTA_PROTO_MAX+1];
  1072. int ret = 0;
  1073. ret = nla_parse_nested_deprecated(tb, CTA_PROTO_MAX, attr,
  1074. proto_nla_policy, NULL);
  1075. if (ret < 0)
  1076. return ret;
  1077. if (!(flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)))
  1078. return 0;
  1079. if (!tb[CTA_PROTO_NUM])
  1080. return -EINVAL;
  1081. tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
  1082. rcu_read_lock();
  1083. l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
  1084. if (likely(l4proto->nlattr_to_tuple)) {
  1085. ret = nla_validate_nested_deprecated(attr, CTA_PROTO_MAX,
  1086. l4proto->nla_policy,
  1087. NULL);
  1088. if (ret == 0)
  1089. ret = l4proto->nlattr_to_tuple(tb, tuple, flags);
  1090. }
  1091. rcu_read_unlock();
  1092. return ret;
  1093. }
  1094. static int
  1095. ctnetlink_parse_zone(const struct nlattr *attr,
  1096. struct nf_conntrack_zone *zone)
  1097. {
  1098. nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
  1099. NF_CT_DEFAULT_ZONE_DIR, 0);
  1100. #ifdef CONFIG_NF_CONNTRACK_ZONES
  1101. if (attr)
  1102. zone->id = ntohs(nla_get_be16(attr));
  1103. #else
  1104. if (attr)
  1105. return -EOPNOTSUPP;
  1106. #endif
  1107. return 0;
  1108. }
  1109. static int
  1110. ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
  1111. struct nf_conntrack_zone *zone)
  1112. {
  1113. int ret;
  1114. if (zone->id != NF_CT_DEFAULT_ZONE_ID)
  1115. return -EINVAL;
  1116. ret = ctnetlink_parse_zone(attr, zone);
  1117. if (ret < 0)
  1118. return ret;
  1119. if (type == CTA_TUPLE_REPLY)
  1120. zone->dir = NF_CT_ZONE_DIR_REPL;
  1121. else
  1122. zone->dir = NF_CT_ZONE_DIR_ORIG;
  1123. return 0;
  1124. }
  1125. static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
  1126. [CTA_TUPLE_IP] = { .type = NLA_NESTED },
  1127. [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
  1128. [CTA_TUPLE_ZONE] = { .type = NLA_U16 },
  1129. };
  1130. #define CTA_FILTER_F_ALL_CTA_PROTO \
  1131. (CTA_FILTER_F_CTA_PROTO_SRC_PORT | \
  1132. CTA_FILTER_F_CTA_PROTO_DST_PORT | \
  1133. CTA_FILTER_F_CTA_PROTO_ICMP_TYPE | \
  1134. CTA_FILTER_F_CTA_PROTO_ICMP_CODE | \
  1135. CTA_FILTER_F_CTA_PROTO_ICMP_ID | \
  1136. CTA_FILTER_F_CTA_PROTO_ICMPV6_TYPE | \
  1137. CTA_FILTER_F_CTA_PROTO_ICMPV6_CODE | \
  1138. CTA_FILTER_F_CTA_PROTO_ICMPV6_ID)
  1139. static int
  1140. ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
  1141. struct nf_conntrack_tuple *tuple, u32 type,
  1142. u_int8_t l3num, struct nf_conntrack_zone *zone,
  1143. u_int32_t flags)
  1144. {
  1145. struct nlattr *tb[CTA_TUPLE_MAX+1];
  1146. int err;
  1147. memset(tuple, 0, sizeof(*tuple));
  1148. err = nla_parse_nested_deprecated(tb, CTA_TUPLE_MAX, cda[type],
  1149. tuple_nla_policy, NULL);
  1150. if (err < 0)
  1151. return err;
  1152. if (l3num != NFPROTO_IPV4 && l3num != NFPROTO_IPV6)
  1153. return -EOPNOTSUPP;
  1154. tuple->src.l3num = l3num;
  1155. if (flags & CTA_FILTER_FLAG(CTA_IP_DST) ||
  1156. flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
  1157. if (!tb[CTA_TUPLE_IP])
  1158. return -EINVAL;
  1159. err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple, flags);
  1160. if (err < 0)
  1161. return err;
  1162. }
  1163. if (flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) {
  1164. if (!tb[CTA_TUPLE_PROTO])
  1165. return -EINVAL;
  1166. err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple, flags);
  1167. if (err < 0)
  1168. return err;
  1169. } else if (flags & CTA_FILTER_FLAG(ALL_CTA_PROTO)) {
  1170. /* Can't manage proto flags without a protonum */
  1171. return -EINVAL;
  1172. }
  1173. if ((flags & CTA_FILTER_FLAG(CTA_TUPLE_ZONE)) && tb[CTA_TUPLE_ZONE]) {
  1174. if (!zone)
  1175. return -EINVAL;
  1176. err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
  1177. type, zone);
  1178. if (err < 0)
  1179. return err;
  1180. }
  1181. /* orig and expect tuples get DIR_ORIGINAL */
  1182. if (type == CTA_TUPLE_REPLY)
  1183. tuple->dst.dir = IP_CT_DIR_REPLY;
  1184. else
  1185. tuple->dst.dir = IP_CT_DIR_ORIGINAL;
  1186. return 0;
  1187. }
  1188. static int
  1189. ctnetlink_parse_tuple(const struct nlattr * const cda[],
  1190. struct nf_conntrack_tuple *tuple, u32 type,
  1191. u_int8_t l3num, struct nf_conntrack_zone *zone)
  1192. {
  1193. return ctnetlink_parse_tuple_filter(cda, tuple, type, l3num, zone,
  1194. CTA_FILTER_FLAG(ALL));
  1195. }
  1196. static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
  1197. [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
  1198. .len = NF_CT_HELPER_NAME_LEN - 1 },
  1199. };
  1200. static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
  1201. struct nlattr **helpinfo)
  1202. {
  1203. int err;
  1204. struct nlattr *tb[CTA_HELP_MAX+1];
  1205. err = nla_parse_nested_deprecated(tb, CTA_HELP_MAX, attr,
  1206. help_nla_policy, NULL);
  1207. if (err < 0)
  1208. return err;
  1209. if (!tb[CTA_HELP_NAME])
  1210. return -EINVAL;
  1211. *helper_name = nla_data(tb[CTA_HELP_NAME]);
  1212. if (tb[CTA_HELP_INFO])
  1213. *helpinfo = tb[CTA_HELP_INFO];
  1214. return 0;
  1215. }
  1216. static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
  1217. [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
  1218. [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
  1219. [CTA_STATUS] = { .type = NLA_U32 },
  1220. [CTA_PROTOINFO] = { .type = NLA_NESTED },
  1221. [CTA_HELP] = { .type = NLA_NESTED },
  1222. [CTA_NAT_SRC] = { .type = NLA_NESTED },
  1223. [CTA_TIMEOUT] = { .type = NLA_U32 },
  1224. [CTA_MARK] = { .type = NLA_U32 },
  1225. [CTA_ID] = { .type = NLA_U32 },
  1226. [CTA_NAT_DST] = { .type = NLA_NESTED },
  1227. [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
  1228. [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
  1229. [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
  1230. [CTA_ZONE] = { .type = NLA_U16 },
  1231. [CTA_MARK_MASK] = { .type = NLA_U32 },
  1232. [CTA_LABELS] = { .type = NLA_BINARY,
  1233. .len = NF_CT_LABELS_MAX_SIZE },
  1234. [CTA_LABELS_MASK] = { .type = NLA_BINARY,
  1235. .len = NF_CT_LABELS_MAX_SIZE },
  1236. [CTA_FILTER] = { .type = NLA_NESTED },
  1237. };
  1238. static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data)
  1239. {
  1240. if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
  1241. return 0;
  1242. return ctnetlink_filter_match(ct, data);
  1243. }
  1244. static int ctnetlink_flush_conntrack(struct net *net,
  1245. const struct nlattr * const cda[],
  1246. u32 portid, int report, u8 family)
  1247. {
  1248. struct ctnetlink_filter *filter = NULL;
  1249. if (ctnetlink_needs_filter(family, cda)) {
  1250. if (cda[CTA_FILTER])
  1251. return -EOPNOTSUPP;
  1252. filter = ctnetlink_alloc_filter(cda, family);
  1253. if (IS_ERR(filter))
  1254. return PTR_ERR(filter);
  1255. }
  1256. nf_ct_iterate_cleanup_net(net, ctnetlink_flush_iterate, filter,
  1257. portid, report);
  1258. kfree(filter);
  1259. return 0;
  1260. }
  1261. static int ctnetlink_del_conntrack(struct net *net, struct sock *ctnl,
  1262. struct sk_buff *skb,
  1263. const struct nlmsghdr *nlh,
  1264. const struct nlattr * const cda[],
  1265. struct netlink_ext_ack *extack)
  1266. {
  1267. struct nf_conntrack_tuple_hash *h;
  1268. struct nf_conntrack_tuple tuple;
  1269. struct nf_conn *ct;
  1270. struct nfgenmsg *nfmsg = nlmsg_data(nlh);
  1271. struct nf_conntrack_zone zone;
  1272. int err;
  1273. err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
  1274. if (err < 0)
  1275. return err;
  1276. if (cda[CTA_TUPLE_ORIG])
  1277. err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
  1278. nfmsg->nfgen_family, &zone);
  1279. else if (cda[CTA_TUPLE_REPLY])
  1280. err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
  1281. nfmsg->nfgen_family, &zone);
  1282. else {
  1283. u_int8_t u3 = nfmsg->version ? nfmsg->nfgen_family : AF_UNSPEC;
  1284. return ctnetlink_flush_conntrack(net, cda,
  1285. NETLINK_CB(skb).portid,
  1286. nlmsg_report(nlh), u3);
  1287. }
  1288. if (err < 0)
  1289. return err;
  1290. h = nf_conntrack_find_get(net, &zone, &tuple);
  1291. if (!h)
  1292. return -ENOENT;
  1293. ct = nf_ct_tuplehash_to_ctrack(h);
  1294. if (test_bit(IPS_OFFLOAD_BIT, &ct->status)) {
  1295. nf_ct_put(ct);
  1296. return -EBUSY;
  1297. }
  1298. if (cda[CTA_ID]) {
  1299. __be32 id = nla_get_be32(cda[CTA_ID]);
  1300. if (id != (__force __be32)nf_ct_get_id(ct)) {
  1301. nf_ct_put(ct);
  1302. return -ENOENT;
  1303. }
  1304. }
  1305. nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
  1306. nf_ct_put(ct);
  1307. return 0;
  1308. }
  1309. static int ctnetlink_get_conntrack(struct net *net, struct sock *ctnl,
  1310. struct sk_buff *skb,
  1311. const struct nlmsghdr *nlh,
  1312. const struct nlattr * const cda[],
  1313. struct netlink_ext_ack *extack)
  1314. {
  1315. struct nf_conntrack_tuple_hash *h;
  1316. struct nf_conntrack_tuple tuple;
  1317. struct nf_conn *ct;
  1318. struct sk_buff *skb2 = NULL;
  1319. struct nfgenmsg *nfmsg = nlmsg_data(nlh);
  1320. u_int8_t u3 = nfmsg->nfgen_family;
  1321. struct nf_conntrack_zone zone;
  1322. int err;
  1323. if (nlh->nlmsg_flags & NLM_F_DUMP) {
  1324. struct netlink_dump_control c = {
  1325. .start = ctnetlink_start,
  1326. .dump = ctnetlink_dump_table,
  1327. .done = ctnetlink_done,
  1328. .data = (void *)cda,
  1329. };
  1330. return netlink_dump_start(ctnl, skb, nlh, &c);
  1331. }
  1332. err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
  1333. if (err < 0)
  1334. return err;
  1335. if (cda[CTA_TUPLE_ORIG])
  1336. err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
  1337. u3, &zone);
  1338. else if (cda[CTA_TUPLE_REPLY])
  1339. err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
  1340. u3, &zone);
  1341. else
  1342. return -EINVAL;
  1343. if (err < 0)
  1344. return err;
  1345. h = nf_conntrack_find_get(net, &zone, &tuple);
  1346. if (!h)
  1347. return -ENOENT;
  1348. ct = nf_ct_tuplehash_to_ctrack(h);
  1349. err = -ENOMEM;
  1350. skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
  1351. if (skb2 == NULL) {
  1352. nf_ct_put(ct);
  1353. return -ENOMEM;
  1354. }
  1355. err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
  1356. NFNL_MSG_TYPE(nlh->nlmsg_type), ct, true, 0);
  1357. nf_ct_put(ct);
  1358. if (err <= 0)
  1359. goto free;
  1360. err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
  1361. if (err < 0)
  1362. goto out;
  1363. return 0;
  1364. free:
  1365. kfree_skb(skb2);
  1366. out:
  1367. /* this avoids a loop in nfnetlink. */
  1368. return err == -EAGAIN ? -ENOBUFS : err;
  1369. }
  1370. static int ctnetlink_done_list(struct netlink_callback *cb)
  1371. {
  1372. if (cb->args[1])
  1373. nf_ct_put((struct nf_conn *)cb->args[1]);
  1374. return 0;
  1375. }
  1376. static int
  1377. ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
  1378. {
  1379. struct nf_conn *ct, *last;
  1380. struct nf_conntrack_tuple_hash *h;
  1381. struct hlist_nulls_node *n;
  1382. struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
  1383. u_int8_t l3proto = nfmsg->nfgen_family;
  1384. int res;
  1385. int cpu;
  1386. struct hlist_nulls_head *list;
  1387. struct net *net = sock_net(skb->sk);
  1388. if (cb->args[2])
  1389. return 0;
  1390. last = (struct nf_conn *)cb->args[1];
  1391. for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
  1392. struct ct_pcpu *pcpu;
  1393. if (!cpu_possible(cpu))
  1394. continue;
  1395. pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
  1396. spin_lock_bh(&pcpu->lock);
  1397. list = dying ? &pcpu->dying : &pcpu->unconfirmed;
  1398. restart:
  1399. hlist_nulls_for_each_entry(h, n, list, hnnode) {
  1400. ct = nf_ct_tuplehash_to_ctrack(h);
  1401. if (l3proto && nf_ct_l3num(ct) != l3proto)
  1402. continue;
  1403. if (cb->args[1]) {
  1404. if (ct != last)
  1405. continue;
  1406. cb->args[1] = 0;
  1407. }
  1408. /* We can't dump extension info for the unconfirmed
  1409. * list because unconfirmed conntracks can have
  1410. * ct->ext reallocated (and thus freed).
  1411. *
  1412. * In the dying list case ct->ext can't be free'd
  1413. * until after we drop pcpu->lock.
  1414. */
  1415. res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
  1416. cb->nlh->nlmsg_seq,
  1417. NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
  1418. ct, dying ? true : false, 0);
  1419. if (res < 0) {
  1420. if (!atomic_inc_not_zero(&ct->ct_general.use))
  1421. continue;
  1422. cb->args[0] = cpu;
  1423. cb->args[1] = (unsigned long)ct;
  1424. spin_unlock_bh(&pcpu->lock);
  1425. goto out;
  1426. }
  1427. }
  1428. if (cb->args[1]) {
  1429. cb->args[1] = 0;
  1430. goto restart;
  1431. }
  1432. spin_unlock_bh(&pcpu->lock);
  1433. }
  1434. cb->args[2] = 1;
  1435. out:
  1436. if (last)
  1437. nf_ct_put(last);
  1438. return skb->len;
  1439. }
  1440. static int
  1441. ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
  1442. {
  1443. return ctnetlink_dump_list(skb, cb, true);
  1444. }
  1445. static int ctnetlink_get_ct_dying(struct net *net, struct sock *ctnl,
  1446. struct sk_buff *skb,
  1447. const struct nlmsghdr *nlh,
  1448. const struct nlattr * const cda[],
  1449. struct netlink_ext_ack *extack)
  1450. {
  1451. if (nlh->nlmsg_flags & NLM_F_DUMP) {
  1452. struct netlink_dump_control c = {
  1453. .dump = ctnetlink_dump_dying,
  1454. .done = ctnetlink_done_list,
  1455. };
  1456. return netlink_dump_start(ctnl, skb, nlh, &c);
  1457. }
  1458. return -EOPNOTSUPP;
  1459. }
  1460. static int
  1461. ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
  1462. {
  1463. return ctnetlink_dump_list(skb, cb, false);
  1464. }
  1465. static int ctnetlink_get_ct_unconfirmed(struct net *net, struct sock *ctnl,
  1466. struct sk_buff *skb,
  1467. const struct nlmsghdr *nlh,
  1468. const struct nlattr * const cda[],
  1469. struct netlink_ext_ack *extack)
  1470. {
  1471. if (nlh->nlmsg_flags & NLM_F_DUMP) {
  1472. struct netlink_dump_control c = {
  1473. .dump = ctnetlink_dump_unconfirmed,
  1474. .done = ctnetlink_done_list,
  1475. };
  1476. return netlink_dump_start(ctnl, skb, nlh, &c);
  1477. }
  1478. return -EOPNOTSUPP;
  1479. }
  1480. #if IS_ENABLED(CONFIG_NF_NAT)
  1481. static int
  1482. ctnetlink_parse_nat_setup(struct nf_conn *ct,
  1483. enum nf_nat_manip_type manip,
  1484. const struct nlattr *attr)
  1485. __must_hold(RCU)
  1486. {
  1487. struct nf_nat_hook *nat_hook;
  1488. int err;
  1489. nat_hook = rcu_dereference(nf_nat_hook);
  1490. if (!nat_hook) {
  1491. #ifdef CONFIG_MODULES
  1492. rcu_read_unlock();
  1493. nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
  1494. if (request_module("nf-nat") < 0) {
  1495. nfnl_lock(NFNL_SUBSYS_CTNETLINK);
  1496. rcu_read_lock();
  1497. return -EOPNOTSUPP;
  1498. }
  1499. nfnl_lock(NFNL_SUBSYS_CTNETLINK);
  1500. rcu_read_lock();
  1501. nat_hook = rcu_dereference(nf_nat_hook);
  1502. if (nat_hook)
  1503. return -EAGAIN;
  1504. #endif
  1505. return -EOPNOTSUPP;
  1506. }
  1507. err = nat_hook->parse_nat_setup(ct, manip, attr);
  1508. if (err == -EAGAIN) {
  1509. #ifdef CONFIG_MODULES
  1510. rcu_read_unlock();
  1511. nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
  1512. if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
  1513. nfnl_lock(NFNL_SUBSYS_CTNETLINK);
  1514. rcu_read_lock();
  1515. return -EOPNOTSUPP;
  1516. }
  1517. nfnl_lock(NFNL_SUBSYS_CTNETLINK);
  1518. rcu_read_lock();
  1519. #else
  1520. err = -EOPNOTSUPP;
  1521. #endif
  1522. }
  1523. return err;
  1524. }
  1525. #endif
  1526. static void
  1527. __ctnetlink_change_status(struct nf_conn *ct, unsigned long on,
  1528. unsigned long off)
  1529. {
  1530. unsigned int bit;
  1531. /* Ignore these unchangable bits */
  1532. on &= ~IPS_UNCHANGEABLE_MASK;
  1533. off &= ~IPS_UNCHANGEABLE_MASK;
  1534. for (bit = 0; bit < __IPS_MAX_BIT; bit++) {
  1535. if (on & (1 << bit))
  1536. set_bit(bit, &ct->status);
  1537. else if (off & (1 << bit))
  1538. clear_bit(bit, &ct->status);
  1539. }
  1540. }
  1541. static int
  1542. ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
  1543. {
  1544. unsigned long d;
  1545. unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
  1546. d = ct->status ^ status;
  1547. if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
  1548. /* unchangeable */
  1549. return -EBUSY;
  1550. if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
  1551. /* SEEN_REPLY bit can only be set */
  1552. return -EBUSY;
  1553. if (d & IPS_ASSURED && !(status & IPS_ASSURED))
  1554. /* ASSURED bit can only be set */
  1555. return -EBUSY;
  1556. __ctnetlink_change_status(ct, status, 0);
  1557. return 0;
  1558. }
  1559. static int
  1560. ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
  1561. {
  1562. #if IS_ENABLED(CONFIG_NF_NAT)
  1563. int ret;
  1564. if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
  1565. return 0;
  1566. ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
  1567. cda[CTA_NAT_DST]);
  1568. if (ret < 0)
  1569. return ret;
  1570. return ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
  1571. cda[CTA_NAT_SRC]);
  1572. #else
  1573. if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
  1574. return 0;
  1575. return -EOPNOTSUPP;
  1576. #endif
  1577. }
  1578. static int ctnetlink_change_helper(struct nf_conn *ct,
  1579. const struct nlattr * const cda[])
  1580. {
  1581. struct nf_conntrack_helper *helper;
  1582. struct nf_conn_help *help = nfct_help(ct);
  1583. char *helpname = NULL;
  1584. struct nlattr *helpinfo = NULL;
  1585. int err;
  1586. err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
  1587. if (err < 0)
  1588. return err;
  1589. /* don't change helper of sibling connections */
  1590. if (ct->master) {
  1591. /* If we try to change the helper to the same thing twice,
  1592. * treat the second attempt as a no-op instead of returning
  1593. * an error.
  1594. */
  1595. err = -EBUSY;
  1596. if (help) {
  1597. rcu_read_lock();
  1598. helper = rcu_dereference(help->helper);
  1599. if (helper && !strcmp(helper->name, helpname))
  1600. err = 0;
  1601. rcu_read_unlock();
  1602. }
  1603. return err;
  1604. }
  1605. if (!strcmp(helpname, "")) {
  1606. if (help && help->helper) {
  1607. /* we had a helper before ... */
  1608. nf_ct_remove_expectations(ct);
  1609. RCU_INIT_POINTER(help->helper, NULL);
  1610. }
  1611. return 0;
  1612. }
  1613. rcu_read_lock();
  1614. helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
  1615. nf_ct_protonum(ct));
  1616. if (helper == NULL) {
  1617. rcu_read_unlock();
  1618. return -EOPNOTSUPP;
  1619. }
  1620. if (help) {
  1621. if (help->helper == helper) {
  1622. /* update private helper data if allowed. */
  1623. if (helper->from_nlattr)
  1624. helper->from_nlattr(helpinfo, ct);
  1625. err = 0;
  1626. } else
  1627. err = -EBUSY;
  1628. } else {
  1629. /* we cannot set a helper for an existing conntrack */
  1630. err = -EOPNOTSUPP;
  1631. }
  1632. rcu_read_unlock();
  1633. return err;
  1634. }
  1635. static int ctnetlink_change_timeout(struct nf_conn *ct,
  1636. const struct nlattr * const cda[])
  1637. {
  1638. u64 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
  1639. if (timeout > INT_MAX)
  1640. timeout = INT_MAX;
  1641. WRITE_ONCE(ct->timeout, nfct_time_stamp + (u32)timeout);
  1642. if (test_bit(IPS_DYING_BIT, &ct->status))
  1643. return -ETIME;
  1644. return 0;
  1645. }
  1646. #if defined(CONFIG_NF_CONNTRACK_MARK)
  1647. static void ctnetlink_change_mark(struct nf_conn *ct,
  1648. const struct nlattr * const cda[])
  1649. {
  1650. u32 mark, newmark, mask = 0;
  1651. if (cda[CTA_MARK_MASK])
  1652. mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
  1653. mark = ntohl(nla_get_be32(cda[CTA_MARK]));
  1654. newmark = (ct->mark & mask) ^ mark;
  1655. if (newmark != ct->mark)
  1656. ct->mark = newmark;
  1657. }
  1658. #endif
  1659. static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
  1660. [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
  1661. [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
  1662. [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
  1663. };
  1664. static int ctnetlink_change_protoinfo(struct nf_conn *ct,
  1665. const struct nlattr * const cda[])
  1666. {
  1667. const struct nlattr *attr = cda[CTA_PROTOINFO];
  1668. const struct nf_conntrack_l4proto *l4proto;
  1669. struct nlattr *tb[CTA_PROTOINFO_MAX+1];
  1670. int err = 0;
  1671. err = nla_parse_nested_deprecated(tb, CTA_PROTOINFO_MAX, attr,
  1672. protoinfo_policy, NULL);
  1673. if (err < 0)
  1674. return err;
  1675. l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
  1676. if (l4proto->from_nlattr)
  1677. err = l4proto->from_nlattr(tb, ct);
  1678. return err;
  1679. }
  1680. static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
  1681. [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
  1682. [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
  1683. [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
  1684. };
  1685. static int change_seq_adj(struct nf_ct_seqadj *seq,
  1686. const struct nlattr * const attr)
  1687. {
  1688. int err;
  1689. struct nlattr *cda[CTA_SEQADJ_MAX+1];
  1690. err = nla_parse_nested_deprecated(cda, CTA_SEQADJ_MAX, attr,
  1691. seqadj_policy, NULL);
  1692. if (err < 0)
  1693. return err;
  1694. if (!cda[CTA_SEQADJ_CORRECTION_POS])
  1695. return -EINVAL;
  1696. seq->correction_pos =
  1697. ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
  1698. if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
  1699. return -EINVAL;
  1700. seq->offset_before =
  1701. ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
  1702. if (!cda[CTA_SEQADJ_OFFSET_AFTER])
  1703. return -EINVAL;
  1704. seq->offset_after =
  1705. ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
  1706. return 0;
  1707. }
  1708. static int
  1709. ctnetlink_change_seq_adj(struct nf_conn *ct,
  1710. const struct nlattr * const cda[])
  1711. {
  1712. struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
  1713. int ret = 0;
  1714. if (!seqadj)
  1715. return 0;
  1716. spin_lock_bh(&ct->lock);
  1717. if (cda[CTA_SEQ_ADJ_ORIG]) {
  1718. ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
  1719. cda[CTA_SEQ_ADJ_ORIG]);
  1720. if (ret < 0)
  1721. goto err;
  1722. set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
  1723. }
  1724. if (cda[CTA_SEQ_ADJ_REPLY]) {
  1725. ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
  1726. cda[CTA_SEQ_ADJ_REPLY]);
  1727. if (ret < 0)
  1728. goto err;
  1729. set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
  1730. }
  1731. spin_unlock_bh(&ct->lock);
  1732. return 0;
  1733. err:
  1734. spin_unlock_bh(&ct->lock);
  1735. return ret;
  1736. }
  1737. static const struct nla_policy synproxy_policy[CTA_SYNPROXY_MAX + 1] = {
  1738. [CTA_SYNPROXY_ISN] = { .type = NLA_U32 },
  1739. [CTA_SYNPROXY_ITS] = { .type = NLA_U32 },
  1740. [CTA_SYNPROXY_TSOFF] = { .type = NLA_U32 },
  1741. };
  1742. static int ctnetlink_change_synproxy(struct nf_conn *ct,
  1743. const struct nlattr * const cda[])
  1744. {
  1745. struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
  1746. struct nlattr *tb[CTA_SYNPROXY_MAX + 1];
  1747. int err;
  1748. if (!synproxy)
  1749. return 0;
  1750. err = nla_parse_nested_deprecated(tb, CTA_SYNPROXY_MAX,
  1751. cda[CTA_SYNPROXY], synproxy_policy,
  1752. NULL);
  1753. if (err < 0)
  1754. return err;
  1755. if (!tb[CTA_SYNPROXY_ISN] ||
  1756. !tb[CTA_SYNPROXY_ITS] ||
  1757. !tb[CTA_SYNPROXY_TSOFF])
  1758. return -EINVAL;
  1759. synproxy->isn = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ISN]));
  1760. synproxy->its = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ITS]));
  1761. synproxy->tsoff = ntohl(nla_get_be32(tb[CTA_SYNPROXY_TSOFF]));
  1762. return 0;
  1763. }
  1764. static int
  1765. ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
  1766. {
  1767. #ifdef CONFIG_NF_CONNTRACK_LABELS
  1768. size_t len = nla_len(cda[CTA_LABELS]);
  1769. const void *mask = cda[CTA_LABELS_MASK];
  1770. if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
  1771. return -EINVAL;
  1772. if (mask) {
  1773. if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
  1774. nla_len(cda[CTA_LABELS_MASK]) != len)
  1775. return -EINVAL;
  1776. mask = nla_data(cda[CTA_LABELS_MASK]);
  1777. }
  1778. len /= sizeof(u32);
  1779. return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
  1780. #else
  1781. return -EOPNOTSUPP;
  1782. #endif
  1783. }
  1784. static int
  1785. ctnetlink_change_conntrack(struct nf_conn *ct,
  1786. const struct nlattr * const cda[])
  1787. {
  1788. int err;
  1789. /* only allow NAT changes and master assignation for new conntracks */
  1790. if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
  1791. return -EOPNOTSUPP;
  1792. if (cda[CTA_HELP]) {
  1793. err = ctnetlink_change_helper(ct, cda);
  1794. if (err < 0)
  1795. return err;
  1796. }
  1797. if (cda[CTA_TIMEOUT]) {
  1798. err = ctnetlink_change_timeout(ct, cda);
  1799. if (err < 0)
  1800. return err;
  1801. }
  1802. if (cda[CTA_STATUS]) {
  1803. err = ctnetlink_change_status(ct, cda);
  1804. if (err < 0)
  1805. return err;
  1806. }
  1807. if (cda[CTA_PROTOINFO]) {
  1808. err = ctnetlink_change_protoinfo(ct, cda);
  1809. if (err < 0)
  1810. return err;
  1811. }
  1812. #if defined(CONFIG_NF_CONNTRACK_MARK)
  1813. if (cda[CTA_MARK])
  1814. ctnetlink_change_mark(ct, cda);
  1815. #endif
  1816. if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
  1817. err = ctnetlink_change_seq_adj(ct, cda);
  1818. if (err < 0)
  1819. return err;
  1820. }
  1821. if (cda[CTA_SYNPROXY]) {
  1822. err = ctnetlink_change_synproxy(ct, cda);
  1823. if (err < 0)
  1824. return err;
  1825. }
  1826. if (cda[CTA_LABELS]) {
  1827. err = ctnetlink_attach_labels(ct, cda);
  1828. if (err < 0)
  1829. return err;
  1830. }
  1831. return 0;
  1832. }
  1833. static struct nf_conn *
  1834. ctnetlink_create_conntrack(struct net *net,
  1835. const struct nf_conntrack_zone *zone,
  1836. const struct nlattr * const cda[],
  1837. struct nf_conntrack_tuple *otuple,
  1838. struct nf_conntrack_tuple *rtuple,
  1839. u8 u3)
  1840. {
  1841. struct nf_conn *ct;
  1842. int err = -EINVAL;
  1843. struct nf_conntrack_helper *helper;
  1844. struct nf_conn_tstamp *tstamp;
  1845. u64 timeout;
  1846. ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
  1847. if (IS_ERR(ct))
  1848. return ERR_PTR(-ENOMEM);
  1849. if (!cda[CTA_TIMEOUT])
  1850. goto err1;
  1851. timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
  1852. if (timeout > INT_MAX)
  1853. timeout = INT_MAX;
  1854. ct->timeout = (u32)timeout + nfct_time_stamp;
  1855. rcu_read_lock();
  1856. if (cda[CTA_HELP]) {
  1857. char *helpname = NULL;
  1858. struct nlattr *helpinfo = NULL;
  1859. err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
  1860. if (err < 0)
  1861. goto err2;
  1862. helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
  1863. nf_ct_protonum(ct));
  1864. if (helper == NULL) {
  1865. rcu_read_unlock();
  1866. #ifdef CONFIG_MODULES
  1867. if (request_module("nfct-helper-%s", helpname) < 0) {
  1868. err = -EOPNOTSUPP;
  1869. goto err1;
  1870. }
  1871. rcu_read_lock();
  1872. helper = __nf_conntrack_helper_find(helpname,
  1873. nf_ct_l3num(ct),
  1874. nf_ct_protonum(ct));
  1875. if (helper) {
  1876. err = -EAGAIN;
  1877. goto err2;
  1878. }
  1879. rcu_read_unlock();
  1880. #endif
  1881. err = -EOPNOTSUPP;
  1882. goto err1;
  1883. } else {
  1884. struct nf_conn_help *help;
  1885. help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
  1886. if (help == NULL) {
  1887. err = -ENOMEM;
  1888. goto err2;
  1889. }
  1890. /* set private helper data if allowed. */
  1891. if (helper->from_nlattr)
  1892. helper->from_nlattr(helpinfo, ct);
  1893. /* disable helper auto-assignment for this entry */
  1894. ct->status |= IPS_HELPER;
  1895. RCU_INIT_POINTER(help->helper, helper);
  1896. }
  1897. } else {
  1898. /* try an implicit helper assignation */
  1899. err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
  1900. if (err < 0)
  1901. goto err2;
  1902. }
  1903. err = ctnetlink_setup_nat(ct, cda);
  1904. if (err < 0)
  1905. goto err2;
  1906. nf_ct_acct_ext_add(ct, GFP_ATOMIC);
  1907. nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
  1908. nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
  1909. nf_ct_labels_ext_add(ct);
  1910. nfct_seqadj_ext_add(ct);
  1911. nfct_synproxy_ext_add(ct);
  1912. /* we must add conntrack extensions before confirmation. */
  1913. ct->status |= IPS_CONFIRMED;
  1914. if (cda[CTA_STATUS]) {
  1915. err = ctnetlink_change_status(ct, cda);
  1916. if (err < 0)
  1917. goto err2;
  1918. }
  1919. if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
  1920. err = ctnetlink_change_seq_adj(ct, cda);
  1921. if (err < 0)
  1922. goto err2;
  1923. }
  1924. memset(&ct->proto, 0, sizeof(ct->proto));
  1925. if (cda[CTA_PROTOINFO]) {
  1926. err = ctnetlink_change_protoinfo(ct, cda);
  1927. if (err < 0)
  1928. goto err2;
  1929. }
  1930. if (cda[CTA_SYNPROXY]) {
  1931. err = ctnetlink_change_synproxy(ct, cda);
  1932. if (err < 0)
  1933. goto err2;
  1934. }
  1935. #if defined(CONFIG_NF_CONNTRACK_MARK)
  1936. if (cda[CTA_MARK])
  1937. ctnetlink_change_mark(ct, cda);
  1938. #endif
  1939. /* setup master conntrack: this is a confirmed expectation */
  1940. if (cda[CTA_TUPLE_MASTER]) {
  1941. struct nf_conntrack_tuple master;
  1942. struct nf_conntrack_tuple_hash *master_h;
  1943. struct nf_conn *master_ct;
  1944. err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
  1945. u3, NULL);
  1946. if (err < 0)
  1947. goto err2;
  1948. master_h = nf_conntrack_find_get(net, zone, &master);
  1949. if (master_h == NULL) {
  1950. err = -ENOENT;
  1951. goto err2;
  1952. }
  1953. master_ct = nf_ct_tuplehash_to_ctrack(master_h);
  1954. __set_bit(IPS_EXPECTED_BIT, &ct->status);
  1955. ct->master = master_ct;
  1956. }
  1957. tstamp = nf_conn_tstamp_find(ct);
  1958. if (tstamp)
  1959. tstamp->start = ktime_get_real_ns();
  1960. err = nf_conntrack_hash_check_insert(ct);
  1961. if (err < 0)
  1962. goto err2;
  1963. rcu_read_unlock();
  1964. return ct;
  1965. err2:
  1966. rcu_read_unlock();
  1967. err1:
  1968. nf_conntrack_free(ct);
  1969. return ERR_PTR(err);
  1970. }
  1971. static int ctnetlink_new_conntrack(struct net *net, struct sock *ctnl,
  1972. struct sk_buff *skb,
  1973. const struct nlmsghdr *nlh,
  1974. const struct nlattr * const cda[],
  1975. struct netlink_ext_ack *extack)
  1976. {
  1977. struct nf_conntrack_tuple otuple, rtuple;
  1978. struct nf_conntrack_tuple_hash *h = NULL;
  1979. struct nfgenmsg *nfmsg = nlmsg_data(nlh);
  1980. struct nf_conn *ct;
  1981. u_int8_t u3 = nfmsg->nfgen_family;
  1982. struct nf_conntrack_zone zone;
  1983. int err;
  1984. err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
  1985. if (err < 0)
  1986. return err;
  1987. if (cda[CTA_TUPLE_ORIG]) {
  1988. err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
  1989. u3, &zone);
  1990. if (err < 0)
  1991. return err;
  1992. }
  1993. if (cda[CTA_TUPLE_REPLY]) {
  1994. err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
  1995. u3, &zone);
  1996. if (err < 0)
  1997. return err;
  1998. }
  1999. if (cda[CTA_TUPLE_ORIG])
  2000. h = nf_conntrack_find_get(net, &zone, &otuple);
  2001. else if (cda[CTA_TUPLE_REPLY])
  2002. h = nf_conntrack_find_get(net, &zone, &rtuple);
  2003. if (h == NULL) {
  2004. err = -ENOENT;
  2005. if (nlh->nlmsg_flags & NLM_F_CREATE) {
  2006. enum ip_conntrack_events events;
  2007. if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
  2008. return -EINVAL;
  2009. if (otuple.dst.protonum != rtuple.dst.protonum)
  2010. return -EINVAL;
  2011. ct = ctnetlink_create_conntrack(net, &zone, cda, &otuple,
  2012. &rtuple, u3);
  2013. if (IS_ERR(ct))
  2014. return PTR_ERR(ct);
  2015. err = 0;
  2016. if (test_bit(IPS_EXPECTED_BIT, &ct->status))
  2017. events = 1 << IPCT_RELATED;
  2018. else
  2019. events = 1 << IPCT_NEW;
  2020. if (cda[CTA_LABELS] &&
  2021. ctnetlink_attach_labels(ct, cda) == 0)
  2022. events |= (1 << IPCT_LABEL);
  2023. nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
  2024. (1 << IPCT_ASSURED) |
  2025. (1 << IPCT_HELPER) |
  2026. (1 << IPCT_PROTOINFO) |
  2027. (1 << IPCT_SEQADJ) |
  2028. (1 << IPCT_MARK) |
  2029. (1 << IPCT_SYNPROXY) |
  2030. events,
  2031. ct, NETLINK_CB(skb).portid,
  2032. nlmsg_report(nlh));
  2033. nf_ct_put(ct);
  2034. }
  2035. return err;
  2036. }
  2037. /* implicit 'else' */
  2038. err = -EEXIST;
  2039. ct = nf_ct_tuplehash_to_ctrack(h);
  2040. if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
  2041. err = ctnetlink_change_conntrack(ct, cda);
  2042. if (err == 0) {
  2043. nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
  2044. (1 << IPCT_ASSURED) |
  2045. (1 << IPCT_HELPER) |
  2046. (1 << IPCT_LABEL) |
  2047. (1 << IPCT_PROTOINFO) |
  2048. (1 << IPCT_SEQADJ) |
  2049. (1 << IPCT_MARK) |
  2050. (1 << IPCT_SYNPROXY),
  2051. ct, NETLINK_CB(skb).portid,
  2052. nlmsg_report(nlh));
  2053. }
  2054. }
  2055. nf_ct_put(ct);
  2056. return err;
  2057. }
  2058. static int
  2059. ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
  2060. __u16 cpu, const struct ip_conntrack_stat *st)
  2061. {
  2062. struct nlmsghdr *nlh;
  2063. struct nfgenmsg *nfmsg;
  2064. unsigned int flags = portid ? NLM_F_MULTI : 0, event;
  2065. event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
  2066. IPCTNL_MSG_CT_GET_STATS_CPU);
  2067. nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
  2068. if (nlh == NULL)
  2069. goto nlmsg_failure;
  2070. nfmsg = nlmsg_data(nlh);
  2071. nfmsg->nfgen_family = AF_UNSPEC;
  2072. nfmsg->version = NFNETLINK_V0;
  2073. nfmsg->res_id = htons(cpu);
  2074. if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
  2075. nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
  2076. nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
  2077. nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
  2078. htonl(st->insert_failed)) ||
  2079. nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
  2080. nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
  2081. nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
  2082. nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
  2083. htonl(st->search_restart)) ||
  2084. nla_put_be32(skb, CTA_STATS_CLASH_RESOLVE,
  2085. htonl(st->clash_resolve)))
  2086. goto nla_put_failure;
  2087. nlmsg_end(skb, nlh);
  2088. return skb->len;
  2089. nla_put_failure:
  2090. nlmsg_failure:
  2091. nlmsg_cancel(skb, nlh);
  2092. return -1;
  2093. }
  2094. static int
  2095. ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
  2096. {
  2097. int cpu;
  2098. struct net *net = sock_net(skb->sk);
  2099. if (cb->args[0] == nr_cpu_ids)
  2100. return 0;
  2101. for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
  2102. const struct ip_conntrack_stat *st;
  2103. if (!cpu_possible(cpu))
  2104. continue;
  2105. st = per_cpu_ptr(net->ct.stat, cpu);
  2106. if (ctnetlink_ct_stat_cpu_fill_info(skb,
  2107. NETLINK_CB(cb->skb).portid,
  2108. cb->nlh->nlmsg_seq,
  2109. cpu, st) < 0)
  2110. break;
  2111. }
  2112. cb->args[0] = cpu;
  2113. return skb->len;
  2114. }
  2115. static int ctnetlink_stat_ct_cpu(struct net *net, struct sock *ctnl,
  2116. struct sk_buff *skb,
  2117. const struct nlmsghdr *nlh,
  2118. const struct nlattr * const cda[],
  2119. struct netlink_ext_ack *extack)
  2120. {
  2121. if (nlh->nlmsg_flags & NLM_F_DUMP) {
  2122. struct netlink_dump_control c = {
  2123. .dump = ctnetlink_ct_stat_cpu_dump,
  2124. };
  2125. return netlink_dump_start(ctnl, skb, nlh, &c);
  2126. }
  2127. return 0;
  2128. }
  2129. static int
  2130. ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
  2131. struct net *net)
  2132. {
  2133. struct nlmsghdr *nlh;
  2134. struct nfgenmsg *nfmsg;
  2135. unsigned int flags = portid ? NLM_F_MULTI : 0, event;
  2136. unsigned int nr_conntracks = atomic_read(&net->ct.count);
  2137. event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS);
  2138. nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
  2139. if (nlh == NULL)
  2140. goto nlmsg_failure;
  2141. nfmsg = nlmsg_data(nlh);
  2142. nfmsg->nfgen_family = AF_UNSPEC;
  2143. nfmsg->version = NFNETLINK_V0;
  2144. nfmsg->res_id = 0;
  2145. if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
  2146. goto nla_put_failure;
  2147. if (nla_put_be32(skb, CTA_STATS_GLOBAL_MAX_ENTRIES, htonl(nf_conntrack_max)))
  2148. goto nla_put_failure;
  2149. nlmsg_end(skb, nlh);
  2150. return skb->len;
  2151. nla_put_failure:
  2152. nlmsg_failure:
  2153. nlmsg_cancel(skb, nlh);
  2154. return -1;
  2155. }
  2156. static int ctnetlink_stat_ct(struct net *net, struct sock *ctnl,
  2157. struct sk_buff *skb, const struct nlmsghdr *nlh,
  2158. const struct nlattr * const cda[],
  2159. struct netlink_ext_ack *extack)
  2160. {
  2161. struct sk_buff *skb2;
  2162. int err;
  2163. skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
  2164. if (skb2 == NULL)
  2165. return -ENOMEM;
  2166. err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
  2167. nlh->nlmsg_seq,
  2168. NFNL_MSG_TYPE(nlh->nlmsg_type),
  2169. sock_net(skb->sk));
  2170. if (err <= 0)
  2171. goto free;
  2172. err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
  2173. if (err < 0)
  2174. goto out;
  2175. return 0;
  2176. free:
  2177. kfree_skb(skb2);
  2178. out:
  2179. /* this avoids a loop in nfnetlink. */
  2180. return err == -EAGAIN ? -ENOBUFS : err;
  2181. }
  2182. static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
  2183. [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
  2184. [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
  2185. [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
  2186. [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
  2187. [CTA_EXPECT_ID] = { .type = NLA_U32 },
  2188. [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
  2189. .len = NF_CT_HELPER_NAME_LEN - 1 },
  2190. [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
  2191. [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
  2192. [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
  2193. [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
  2194. [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
  2195. };
  2196. static struct nf_conntrack_expect *
  2197. ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
  2198. struct nf_conntrack_helper *helper,
  2199. struct nf_conntrack_tuple *tuple,
  2200. struct nf_conntrack_tuple *mask);
  2201. #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
  2202. static size_t
  2203. ctnetlink_glue_build_size(const struct nf_conn *ct)
  2204. {
  2205. return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
  2206. + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
  2207. + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
  2208. + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
  2209. + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
  2210. + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
  2211. + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
  2212. + nla_total_size(0) /* CTA_PROTOINFO */
  2213. + nla_total_size(0) /* CTA_HELP */
  2214. + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
  2215. + ctnetlink_secctx_size(ct)
  2216. #if IS_ENABLED(CONFIG_NF_NAT)
  2217. + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
  2218. + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
  2219. #endif
  2220. #ifdef CONFIG_NF_CONNTRACK_MARK
  2221. + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
  2222. #endif
  2223. #ifdef CONFIG_NF_CONNTRACK_ZONES
  2224. + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
  2225. #endif
  2226. + ctnetlink_proto_size(ct)
  2227. ;
  2228. }
  2229. static struct nf_conn *ctnetlink_glue_get_ct(const struct sk_buff *skb,
  2230. enum ip_conntrack_info *ctinfo)
  2231. {
  2232. return nf_ct_get(skb, ctinfo);
  2233. }
  2234. static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
  2235. {
  2236. const struct nf_conntrack_zone *zone;
  2237. struct nlattr *nest_parms;
  2238. zone = nf_ct_zone(ct);
  2239. nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
  2240. if (!nest_parms)
  2241. goto nla_put_failure;
  2242. if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
  2243. goto nla_put_failure;
  2244. if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
  2245. NF_CT_ZONE_DIR_ORIG) < 0)
  2246. goto nla_put_failure;
  2247. nla_nest_end(skb, nest_parms);
  2248. nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
  2249. if (!nest_parms)
  2250. goto nla_put_failure;
  2251. if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
  2252. goto nla_put_failure;
  2253. if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
  2254. NF_CT_ZONE_DIR_REPL) < 0)
  2255. goto nla_put_failure;
  2256. nla_nest_end(skb, nest_parms);
  2257. if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
  2258. NF_CT_DEFAULT_ZONE_DIR) < 0)
  2259. goto nla_put_failure;
  2260. if (ctnetlink_dump_id(skb, ct) < 0)
  2261. goto nla_put_failure;
  2262. if (ctnetlink_dump_status(skb, ct) < 0)
  2263. goto nla_put_failure;
  2264. if (ctnetlink_dump_timeout(skb, ct) < 0)
  2265. goto nla_put_failure;
  2266. if (ctnetlink_dump_protoinfo(skb, ct) < 0)
  2267. goto nla_put_failure;
  2268. if (ctnetlink_dump_helpinfo(skb, ct) < 0)
  2269. goto nla_put_failure;
  2270. #ifdef CONFIG_NF_CONNTRACK_SECMARK
  2271. if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
  2272. goto nla_put_failure;
  2273. #endif
  2274. if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
  2275. goto nla_put_failure;
  2276. if ((ct->status & IPS_SEQ_ADJUST) &&
  2277. ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
  2278. goto nla_put_failure;
  2279. if (ctnetlink_dump_ct_synproxy(skb, ct) < 0)
  2280. goto nla_put_failure;
  2281. #ifdef CONFIG_NF_CONNTRACK_MARK
  2282. if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
  2283. goto nla_put_failure;
  2284. #endif
  2285. if (ctnetlink_dump_labels(skb, ct) < 0)
  2286. goto nla_put_failure;
  2287. return 0;
  2288. nla_put_failure:
  2289. return -ENOSPC;
  2290. }
  2291. static int
  2292. ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
  2293. enum ip_conntrack_info ctinfo,
  2294. u_int16_t ct_attr, u_int16_t ct_info_attr)
  2295. {
  2296. struct nlattr *nest_parms;
  2297. nest_parms = nla_nest_start(skb, ct_attr);
  2298. if (!nest_parms)
  2299. goto nla_put_failure;
  2300. if (__ctnetlink_glue_build(skb, ct) < 0)
  2301. goto nla_put_failure;
  2302. nla_nest_end(skb, nest_parms);
  2303. if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
  2304. goto nla_put_failure;
  2305. return 0;
  2306. nla_put_failure:
  2307. return -ENOSPC;
  2308. }
  2309. static int
  2310. ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[])
  2311. {
  2312. unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
  2313. unsigned long d = ct->status ^ status;
  2314. if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
  2315. /* SEEN_REPLY bit can only be set */
  2316. return -EBUSY;
  2317. if (d & IPS_ASSURED && !(status & IPS_ASSURED))
  2318. /* ASSURED bit can only be set */
  2319. return -EBUSY;
  2320. /* This check is less strict than ctnetlink_change_status()
  2321. * because callers often flip IPS_EXPECTED bits when sending
  2322. * an NFQA_CT attribute to the kernel. So ignore the
  2323. * unchangeable bits but do not error out. Also user programs
  2324. * are allowed to clear the bits that they are allowed to change.
  2325. */
  2326. __ctnetlink_change_status(ct, status, ~status);
  2327. return 0;
  2328. }
  2329. static int
  2330. ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
  2331. {
  2332. int err;
  2333. if (cda[CTA_TIMEOUT]) {
  2334. err = ctnetlink_change_timeout(ct, cda);
  2335. if (err < 0)
  2336. return err;
  2337. }
  2338. if (cda[CTA_STATUS]) {
  2339. err = ctnetlink_update_status(ct, cda);
  2340. if (err < 0)
  2341. return err;
  2342. }
  2343. if (cda[CTA_HELP]) {
  2344. err = ctnetlink_change_helper(ct, cda);
  2345. if (err < 0)
  2346. return err;
  2347. }
  2348. if (cda[CTA_LABELS]) {
  2349. err = ctnetlink_attach_labels(ct, cda);
  2350. if (err < 0)
  2351. return err;
  2352. }
  2353. #if defined(CONFIG_NF_CONNTRACK_MARK)
  2354. if (cda[CTA_MARK]) {
  2355. ctnetlink_change_mark(ct, cda);
  2356. }
  2357. #endif
  2358. return 0;
  2359. }
  2360. static int
  2361. ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
  2362. {
  2363. struct nlattr *cda[CTA_MAX+1];
  2364. int ret;
  2365. ret = nla_parse_nested_deprecated(cda, CTA_MAX, attr, ct_nla_policy,
  2366. NULL);
  2367. if (ret < 0)
  2368. return ret;
  2369. return ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
  2370. }
  2371. static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
  2372. const struct nf_conn *ct,
  2373. struct nf_conntrack_tuple *tuple,
  2374. struct nf_conntrack_tuple *mask)
  2375. {
  2376. int err;
  2377. err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
  2378. nf_ct_l3num(ct), NULL);
  2379. if (err < 0)
  2380. return err;
  2381. return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
  2382. nf_ct_l3num(ct), NULL);
  2383. }
  2384. static int
  2385. ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
  2386. u32 portid, u32 report)
  2387. {
  2388. struct nlattr *cda[CTA_EXPECT_MAX+1];
  2389. struct nf_conntrack_tuple tuple, mask;
  2390. struct nf_conntrack_helper *helper = NULL;
  2391. struct nf_conntrack_expect *exp;
  2392. int err;
  2393. err = nla_parse_nested_deprecated(cda, CTA_EXPECT_MAX, attr,
  2394. exp_nla_policy, NULL);
  2395. if (err < 0)
  2396. return err;
  2397. err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
  2398. ct, &tuple, &mask);
  2399. if (err < 0)
  2400. return err;
  2401. if (cda[CTA_EXPECT_HELP_NAME]) {
  2402. const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
  2403. helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
  2404. nf_ct_protonum(ct));
  2405. if (helper == NULL)
  2406. return -EOPNOTSUPP;
  2407. }
  2408. exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
  2409. helper, &tuple, &mask);
  2410. if (IS_ERR(exp))
  2411. return PTR_ERR(exp);
  2412. err = nf_ct_expect_related_report(exp, portid, report, 0);
  2413. nf_ct_expect_put(exp);
  2414. return err;
  2415. }
  2416. static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
  2417. enum ip_conntrack_info ctinfo, int diff)
  2418. {
  2419. if (!(ct->status & IPS_NAT_MASK))
  2420. return;
  2421. nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
  2422. }
  2423. static struct nfnl_ct_hook ctnetlink_glue_hook = {
  2424. .get_ct = ctnetlink_glue_get_ct,
  2425. .build_size = ctnetlink_glue_build_size,
  2426. .build = ctnetlink_glue_build,
  2427. .parse = ctnetlink_glue_parse,
  2428. .attach_expect = ctnetlink_glue_attach_expect,
  2429. .seq_adjust = ctnetlink_glue_seqadj,
  2430. };
  2431. #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
  2432. /***********************************************************************
  2433. * EXPECT
  2434. ***********************************************************************/
  2435. static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
  2436. const struct nf_conntrack_tuple *tuple,
  2437. u32 type)
  2438. {
  2439. struct nlattr *nest_parms;
  2440. nest_parms = nla_nest_start(skb, type);
  2441. if (!nest_parms)
  2442. goto nla_put_failure;
  2443. if (ctnetlink_dump_tuples(skb, tuple) < 0)
  2444. goto nla_put_failure;
  2445. nla_nest_end(skb, nest_parms);
  2446. return 0;
  2447. nla_put_failure:
  2448. return -1;
  2449. }
  2450. static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
  2451. const struct nf_conntrack_tuple *tuple,
  2452. const struct nf_conntrack_tuple_mask *mask)
  2453. {
  2454. const struct nf_conntrack_l4proto *l4proto;
  2455. struct nf_conntrack_tuple m;
  2456. struct nlattr *nest_parms;
  2457. int ret;
  2458. memset(&m, 0xFF, sizeof(m));
  2459. memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
  2460. m.src.u.all = mask->src.u.all;
  2461. m.src.l3num = tuple->src.l3num;
  2462. m.dst.protonum = tuple->dst.protonum;
  2463. nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK);
  2464. if (!nest_parms)
  2465. goto nla_put_failure;
  2466. rcu_read_lock();
  2467. ret = ctnetlink_dump_tuples_ip(skb, &m);
  2468. if (ret >= 0) {
  2469. l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
  2470. ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
  2471. }
  2472. rcu_read_unlock();
  2473. if (unlikely(ret < 0))
  2474. goto nla_put_failure;
  2475. nla_nest_end(skb, nest_parms);
  2476. return 0;
  2477. nla_put_failure:
  2478. return -1;
  2479. }
  2480. static const union nf_inet_addr any_addr;
  2481. static __be32 nf_expect_get_id(const struct nf_conntrack_expect *exp)
  2482. {
  2483. static __read_mostly siphash_key_t exp_id_seed;
  2484. unsigned long a, b, c, d;
  2485. net_get_random_once(&exp_id_seed, sizeof(exp_id_seed));
  2486. a = (unsigned long)exp;
  2487. b = (unsigned long)exp->helper;
  2488. c = (unsigned long)exp->master;
  2489. d = (unsigned long)siphash(&exp->tuple, sizeof(exp->tuple), &exp_id_seed);
  2490. #ifdef CONFIG_64BIT
  2491. return (__force __be32)siphash_4u64((u64)a, (u64)b, (u64)c, (u64)d, &exp_id_seed);
  2492. #else
  2493. return (__force __be32)siphash_4u32((u32)a, (u32)b, (u32)c, (u32)d, &exp_id_seed);
  2494. #endif
  2495. }
  2496. static int
  2497. ctnetlink_exp_dump_expect(struct sk_buff *skb,
  2498. const struct nf_conntrack_expect *exp)
  2499. {
  2500. struct nf_conn *master = exp->master;
  2501. long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
  2502. struct nf_conn_help *help;
  2503. #if IS_ENABLED(CONFIG_NF_NAT)
  2504. struct nlattr *nest_parms;
  2505. struct nf_conntrack_tuple nat_tuple = {};
  2506. #endif
  2507. struct nf_ct_helper_expectfn *expfn;
  2508. if (timeout < 0)
  2509. timeout = 0;
  2510. if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
  2511. goto nla_put_failure;
  2512. if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
  2513. goto nla_put_failure;
  2514. if (ctnetlink_exp_dump_tuple(skb,
  2515. &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
  2516. CTA_EXPECT_MASTER) < 0)
  2517. goto nla_put_failure;
  2518. #if IS_ENABLED(CONFIG_NF_NAT)
  2519. if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
  2520. exp->saved_proto.all) {
  2521. nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT);
  2522. if (!nest_parms)
  2523. goto nla_put_failure;
  2524. if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
  2525. goto nla_put_failure;
  2526. nat_tuple.src.l3num = nf_ct_l3num(master);
  2527. nat_tuple.src.u3 = exp->saved_addr;
  2528. nat_tuple.dst.protonum = nf_ct_protonum(master);
  2529. nat_tuple.src.u = exp->saved_proto;
  2530. if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
  2531. CTA_EXPECT_NAT_TUPLE) < 0)
  2532. goto nla_put_failure;
  2533. nla_nest_end(skb, nest_parms);
  2534. }
  2535. #endif
  2536. if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
  2537. nla_put_be32(skb, CTA_EXPECT_ID, nf_expect_get_id(exp)) ||
  2538. nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
  2539. nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
  2540. goto nla_put_failure;
  2541. help = nfct_help(master);
  2542. if (help) {
  2543. struct nf_conntrack_helper *helper;
  2544. helper = rcu_dereference(help->helper);
  2545. if (helper &&
  2546. nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
  2547. goto nla_put_failure;
  2548. }
  2549. expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
  2550. if (expfn != NULL &&
  2551. nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
  2552. goto nla_put_failure;
  2553. return 0;
  2554. nla_put_failure:
  2555. return -1;
  2556. }
  2557. static int
  2558. ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
  2559. int event, const struct nf_conntrack_expect *exp)
  2560. {
  2561. struct nlmsghdr *nlh;
  2562. struct nfgenmsg *nfmsg;
  2563. unsigned int flags = portid ? NLM_F_MULTI : 0;
  2564. event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, event);
  2565. nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
  2566. if (nlh == NULL)
  2567. goto nlmsg_failure;
  2568. nfmsg = nlmsg_data(nlh);
  2569. nfmsg->nfgen_family = exp->tuple.src.l3num;
  2570. nfmsg->version = NFNETLINK_V0;
  2571. nfmsg->res_id = 0;
  2572. if (ctnetlink_exp_dump_expect(skb, exp) < 0)
  2573. goto nla_put_failure;
  2574. nlmsg_end(skb, nlh);
  2575. return skb->len;
  2576. nlmsg_failure:
  2577. nla_put_failure:
  2578. nlmsg_cancel(skb, nlh);
  2579. return -1;
  2580. }
  2581. #ifdef CONFIG_NF_CONNTRACK_EVENTS
  2582. static int
  2583. ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
  2584. {
  2585. struct nf_conntrack_expect *exp = item->exp;
  2586. struct net *net = nf_ct_exp_net(exp);
  2587. struct nlmsghdr *nlh;
  2588. struct nfgenmsg *nfmsg;
  2589. struct sk_buff *skb;
  2590. unsigned int type, group;
  2591. int flags = 0;
  2592. if (events & (1 << IPEXP_DESTROY)) {
  2593. type = IPCTNL_MSG_EXP_DELETE;
  2594. group = NFNLGRP_CONNTRACK_EXP_DESTROY;
  2595. } else if (events & (1 << IPEXP_NEW)) {
  2596. type = IPCTNL_MSG_EXP_NEW;
  2597. flags = NLM_F_CREATE|NLM_F_EXCL;
  2598. group = NFNLGRP_CONNTRACK_EXP_NEW;
  2599. } else
  2600. return 0;
  2601. if (!item->report && !nfnetlink_has_listeners(net, group))
  2602. return 0;
  2603. skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
  2604. if (skb == NULL)
  2605. goto errout;
  2606. type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, type);
  2607. nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
  2608. if (nlh == NULL)
  2609. goto nlmsg_failure;
  2610. nfmsg = nlmsg_data(nlh);
  2611. nfmsg->nfgen_family = exp->tuple.src.l3num;
  2612. nfmsg->version = NFNETLINK_V0;
  2613. nfmsg->res_id = 0;
  2614. if (ctnetlink_exp_dump_expect(skb, exp) < 0)
  2615. goto nla_put_failure;
  2616. nlmsg_end(skb, nlh);
  2617. nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
  2618. return 0;
  2619. nla_put_failure:
  2620. nlmsg_cancel(skb, nlh);
  2621. nlmsg_failure:
  2622. kfree_skb(skb);
  2623. errout:
  2624. nfnetlink_set_err(net, 0, 0, -ENOBUFS);
  2625. return 0;
  2626. }
  2627. #endif
  2628. static int ctnetlink_exp_done(struct netlink_callback *cb)
  2629. {
  2630. if (cb->args[1])
  2631. nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
  2632. return 0;
  2633. }
  2634. static int
  2635. ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
  2636. {
  2637. struct net *net = sock_net(skb->sk);
  2638. struct nf_conntrack_expect *exp, *last;
  2639. struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
  2640. u_int8_t l3proto = nfmsg->nfgen_family;
  2641. rcu_read_lock();
  2642. last = (struct nf_conntrack_expect *)cb->args[1];
  2643. for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
  2644. restart:
  2645. hlist_for_each_entry_rcu(exp, &nf_ct_expect_hash[cb->args[0]],
  2646. hnode) {
  2647. if (l3proto && exp->tuple.src.l3num != l3proto)
  2648. continue;
  2649. if (!net_eq(nf_ct_net(exp->master), net))
  2650. continue;
  2651. if (cb->args[1]) {
  2652. if (exp != last)
  2653. continue;
  2654. cb->args[1] = 0;
  2655. }
  2656. if (ctnetlink_exp_fill_info(skb,
  2657. NETLINK_CB(cb->skb).portid,
  2658. cb->nlh->nlmsg_seq,
  2659. IPCTNL_MSG_EXP_NEW,
  2660. exp) < 0) {
  2661. if (!refcount_inc_not_zero(&exp->use))
  2662. continue;
  2663. cb->args[1] = (unsigned long)exp;
  2664. goto out;
  2665. }
  2666. }
  2667. if (cb->args[1]) {
  2668. cb->args[1] = 0;
  2669. goto restart;
  2670. }
  2671. }
  2672. out:
  2673. rcu_read_unlock();
  2674. if (last)
  2675. nf_ct_expect_put(last);
  2676. return skb->len;
  2677. }
  2678. static int
  2679. ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
  2680. {
  2681. struct nf_conntrack_expect *exp, *last;
  2682. struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
  2683. struct nf_conn *ct = cb->data;
  2684. struct nf_conn_help *help = nfct_help(ct);
  2685. u_int8_t l3proto = nfmsg->nfgen_family;
  2686. if (cb->args[0])
  2687. return 0;
  2688. rcu_read_lock();
  2689. last = (struct nf_conntrack_expect *)cb->args[1];
  2690. restart:
  2691. hlist_for_each_entry_rcu(exp, &help->expectations, lnode) {
  2692. if (l3proto && exp->tuple.src.l3num != l3proto)
  2693. continue;
  2694. if (cb->args[1]) {
  2695. if (exp != last)
  2696. continue;
  2697. cb->args[1] = 0;
  2698. }
  2699. if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
  2700. cb->nlh->nlmsg_seq,
  2701. IPCTNL_MSG_EXP_NEW,
  2702. exp) < 0) {
  2703. if (!refcount_inc_not_zero(&exp->use))
  2704. continue;
  2705. cb->args[1] = (unsigned long)exp;
  2706. goto out;
  2707. }
  2708. }
  2709. if (cb->args[1]) {
  2710. cb->args[1] = 0;
  2711. goto restart;
  2712. }
  2713. cb->args[0] = 1;
  2714. out:
  2715. rcu_read_unlock();
  2716. if (last)
  2717. nf_ct_expect_put(last);
  2718. return skb->len;
  2719. }
  2720. static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
  2721. struct sk_buff *skb,
  2722. const struct nlmsghdr *nlh,
  2723. const struct nlattr * const cda[],
  2724. struct netlink_ext_ack *extack)
  2725. {
  2726. int err;
  2727. struct nfgenmsg *nfmsg = nlmsg_data(nlh);
  2728. u_int8_t u3 = nfmsg->nfgen_family;
  2729. struct nf_conntrack_tuple tuple;
  2730. struct nf_conntrack_tuple_hash *h;
  2731. struct nf_conn *ct;
  2732. struct nf_conntrack_zone zone;
  2733. struct netlink_dump_control c = {
  2734. .dump = ctnetlink_exp_ct_dump_table,
  2735. .done = ctnetlink_exp_done,
  2736. };
  2737. err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
  2738. u3, NULL);
  2739. if (err < 0)
  2740. return err;
  2741. err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
  2742. if (err < 0)
  2743. return err;
  2744. h = nf_conntrack_find_get(net, &zone, &tuple);
  2745. if (!h)
  2746. return -ENOENT;
  2747. ct = nf_ct_tuplehash_to_ctrack(h);
  2748. /* No expectation linked to this connection tracking. */
  2749. if (!nfct_help(ct)) {
  2750. nf_ct_put(ct);
  2751. return 0;
  2752. }
  2753. c.data = ct;
  2754. err = netlink_dump_start(ctnl, skb, nlh, &c);
  2755. nf_ct_put(ct);
  2756. return err;
  2757. }
  2758. static int ctnetlink_get_expect(struct net *net, struct sock *ctnl,
  2759. struct sk_buff *skb, const struct nlmsghdr *nlh,
  2760. const struct nlattr * const cda[],
  2761. struct netlink_ext_ack *extack)
  2762. {
  2763. struct nf_conntrack_tuple tuple;
  2764. struct nf_conntrack_expect *exp;
  2765. struct sk_buff *skb2;
  2766. struct nfgenmsg *nfmsg = nlmsg_data(nlh);
  2767. u_int8_t u3 = nfmsg->nfgen_family;
  2768. struct nf_conntrack_zone zone;
  2769. int err;
  2770. if (nlh->nlmsg_flags & NLM_F_DUMP) {
  2771. if (cda[CTA_EXPECT_MASTER])
  2772. return ctnetlink_dump_exp_ct(net, ctnl, skb, nlh, cda,
  2773. extack);
  2774. else {
  2775. struct netlink_dump_control c = {
  2776. .dump = ctnetlink_exp_dump_table,
  2777. .done = ctnetlink_exp_done,
  2778. };
  2779. return netlink_dump_start(ctnl, skb, nlh, &c);
  2780. }
  2781. }
  2782. err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
  2783. if (err < 0)
  2784. return err;
  2785. if (cda[CTA_EXPECT_TUPLE])
  2786. err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
  2787. u3, NULL);
  2788. else if (cda[CTA_EXPECT_MASTER])
  2789. err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
  2790. u3, NULL);
  2791. else
  2792. return -EINVAL;
  2793. if (err < 0)
  2794. return err;
  2795. exp = nf_ct_expect_find_get(net, &zone, &tuple);
  2796. if (!exp)
  2797. return -ENOENT;
  2798. if (cda[CTA_EXPECT_ID]) {
  2799. __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
  2800. if (id != nf_expect_get_id(exp)) {
  2801. nf_ct_expect_put(exp);
  2802. return -ENOENT;
  2803. }
  2804. }
  2805. err = -ENOMEM;
  2806. skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
  2807. if (skb2 == NULL) {
  2808. nf_ct_expect_put(exp);
  2809. goto out;
  2810. }
  2811. rcu_read_lock();
  2812. err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
  2813. nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
  2814. rcu_read_unlock();
  2815. nf_ct_expect_put(exp);
  2816. if (err <= 0)
  2817. goto free;
  2818. err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
  2819. if (err < 0)
  2820. goto out;
  2821. return 0;
  2822. free:
  2823. kfree_skb(skb2);
  2824. out:
  2825. /* this avoids a loop in nfnetlink. */
  2826. return err == -EAGAIN ? -ENOBUFS : err;
  2827. }
  2828. static bool expect_iter_name(struct nf_conntrack_expect *exp, void *data)
  2829. {
  2830. const struct nf_conn_help *m_help;
  2831. const char *name = data;
  2832. m_help = nfct_help(exp->master);
  2833. return strcmp(m_help->helper->name, name) == 0;
  2834. }
  2835. static bool expect_iter_all(struct nf_conntrack_expect *exp, void *data)
  2836. {
  2837. return true;
  2838. }
  2839. static int ctnetlink_del_expect(struct net *net, struct sock *ctnl,
  2840. struct sk_buff *skb, const struct nlmsghdr *nlh,
  2841. const struct nlattr * const cda[],
  2842. struct netlink_ext_ack *extack)
  2843. {
  2844. struct nf_conntrack_expect *exp;
  2845. struct nf_conntrack_tuple tuple;
  2846. struct nfgenmsg *nfmsg = nlmsg_data(nlh);
  2847. u_int8_t u3 = nfmsg->nfgen_family;
  2848. struct nf_conntrack_zone zone;
  2849. int err;
  2850. if (cda[CTA_EXPECT_TUPLE]) {
  2851. /* delete a single expect by tuple */
  2852. err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
  2853. if (err < 0)
  2854. return err;
  2855. err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
  2856. u3, NULL);
  2857. if (err < 0)
  2858. return err;
  2859. /* bump usage count to 2 */
  2860. exp = nf_ct_expect_find_get(net, &zone, &tuple);
  2861. if (!exp)
  2862. return -ENOENT;
  2863. if (cda[CTA_EXPECT_ID]) {
  2864. __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
  2865. if (ntohl(id) != (u32)(unsigned long)exp) {
  2866. nf_ct_expect_put(exp);
  2867. return -ENOENT;
  2868. }
  2869. }
  2870. /* after list removal, usage count == 1 */
  2871. spin_lock_bh(&nf_conntrack_expect_lock);
  2872. if (del_timer(&exp->timeout)) {
  2873. nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
  2874. nlmsg_report(nlh));
  2875. nf_ct_expect_put(exp);
  2876. }
  2877. spin_unlock_bh(&nf_conntrack_expect_lock);
  2878. /* have to put what we 'get' above.
  2879. * after this line usage count == 0 */
  2880. nf_ct_expect_put(exp);
  2881. } else if (cda[CTA_EXPECT_HELP_NAME]) {
  2882. char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
  2883. nf_ct_expect_iterate_net(net, expect_iter_name, name,
  2884. NETLINK_CB(skb).portid,
  2885. nlmsg_report(nlh));
  2886. } else {
  2887. /* This basically means we have to flush everything*/
  2888. nf_ct_expect_iterate_net(net, expect_iter_all, NULL,
  2889. NETLINK_CB(skb).portid,
  2890. nlmsg_report(nlh));
  2891. }
  2892. return 0;
  2893. }
  2894. static int
  2895. ctnetlink_change_expect(struct nf_conntrack_expect *x,
  2896. const struct nlattr * const cda[])
  2897. {
  2898. if (cda[CTA_EXPECT_TIMEOUT]) {
  2899. if (!del_timer(&x->timeout))
  2900. return -ETIME;
  2901. x->timeout.expires = jiffies +
  2902. ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
  2903. add_timer(&x->timeout);
  2904. }
  2905. return 0;
  2906. }
  2907. static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
  2908. [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
  2909. [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
  2910. };
  2911. static int
  2912. ctnetlink_parse_expect_nat(const struct nlattr *attr,
  2913. struct nf_conntrack_expect *exp,
  2914. u_int8_t u3)
  2915. {
  2916. #if IS_ENABLED(CONFIG_NF_NAT)
  2917. struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
  2918. struct nf_conntrack_tuple nat_tuple = {};
  2919. int err;
  2920. err = nla_parse_nested_deprecated(tb, CTA_EXPECT_NAT_MAX, attr,
  2921. exp_nat_nla_policy, NULL);
  2922. if (err < 0)
  2923. return err;
  2924. if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
  2925. return -EINVAL;
  2926. err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
  2927. &nat_tuple, CTA_EXPECT_NAT_TUPLE,
  2928. u3, NULL);
  2929. if (err < 0)
  2930. return err;
  2931. exp->saved_addr = nat_tuple.src.u3;
  2932. exp->saved_proto = nat_tuple.src.u;
  2933. exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
  2934. return 0;
  2935. #else
  2936. return -EOPNOTSUPP;
  2937. #endif
  2938. }
  2939. static struct nf_conntrack_expect *
  2940. ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
  2941. struct nf_conntrack_helper *helper,
  2942. struct nf_conntrack_tuple *tuple,
  2943. struct nf_conntrack_tuple *mask)
  2944. {
  2945. u_int32_t class = 0;
  2946. struct nf_conntrack_expect *exp;
  2947. struct nf_conn_help *help;
  2948. int err;
  2949. help = nfct_help(ct);
  2950. if (!help)
  2951. return ERR_PTR(-EOPNOTSUPP);
  2952. if (cda[CTA_EXPECT_CLASS] && helper) {
  2953. class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
  2954. if (class > helper->expect_class_max)
  2955. return ERR_PTR(-EINVAL);
  2956. }
  2957. exp = nf_ct_expect_alloc(ct);
  2958. if (!exp)
  2959. return ERR_PTR(-ENOMEM);
  2960. if (cda[CTA_EXPECT_FLAGS]) {
  2961. exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
  2962. exp->flags &= ~NF_CT_EXPECT_USERSPACE;
  2963. } else {
  2964. exp->flags = 0;
  2965. }
  2966. if (cda[CTA_EXPECT_FN]) {
  2967. const char *name = nla_data(cda[CTA_EXPECT_FN]);
  2968. struct nf_ct_helper_expectfn *expfn;
  2969. expfn = nf_ct_helper_expectfn_find_by_name(name);
  2970. if (expfn == NULL) {
  2971. err = -EINVAL;
  2972. goto err_out;
  2973. }
  2974. exp->expectfn = expfn->expectfn;
  2975. } else
  2976. exp->expectfn = NULL;
  2977. exp->class = class;
  2978. exp->master = ct;
  2979. exp->helper = helper;
  2980. exp->tuple = *tuple;
  2981. exp->mask.src.u3 = mask->src.u3;
  2982. exp->mask.src.u.all = mask->src.u.all;
  2983. if (cda[CTA_EXPECT_NAT]) {
  2984. err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
  2985. exp, nf_ct_l3num(ct));
  2986. if (err < 0)
  2987. goto err_out;
  2988. }
  2989. return exp;
  2990. err_out:
  2991. nf_ct_expect_put(exp);
  2992. return ERR_PTR(err);
  2993. }
  2994. static int
  2995. ctnetlink_create_expect(struct net *net,
  2996. const struct nf_conntrack_zone *zone,
  2997. const struct nlattr * const cda[],
  2998. u_int8_t u3, u32 portid, int report)
  2999. {
  3000. struct nf_conntrack_tuple tuple, mask, master_tuple;
  3001. struct nf_conntrack_tuple_hash *h = NULL;
  3002. struct nf_conntrack_helper *helper = NULL;
  3003. struct nf_conntrack_expect *exp;
  3004. struct nf_conn *ct;
  3005. int err;
  3006. /* caller guarantees that those three CTA_EXPECT_* exist */
  3007. err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
  3008. u3, NULL);
  3009. if (err < 0)
  3010. return err;
  3011. err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
  3012. u3, NULL);
  3013. if (err < 0)
  3014. return err;
  3015. err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
  3016. u3, NULL);
  3017. if (err < 0)
  3018. return err;
  3019. /* Look for master conntrack of this expectation */
  3020. h = nf_conntrack_find_get(net, zone, &master_tuple);
  3021. if (!h)
  3022. return -ENOENT;
  3023. ct = nf_ct_tuplehash_to_ctrack(h);
  3024. rcu_read_lock();
  3025. if (cda[CTA_EXPECT_HELP_NAME]) {
  3026. const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
  3027. helper = __nf_conntrack_helper_find(helpname, u3,
  3028. nf_ct_protonum(ct));
  3029. if (helper == NULL) {
  3030. rcu_read_unlock();
  3031. #ifdef CONFIG_MODULES
  3032. if (request_module("nfct-helper-%s", helpname) < 0) {
  3033. err = -EOPNOTSUPP;
  3034. goto err_ct;
  3035. }
  3036. rcu_read_lock();
  3037. helper = __nf_conntrack_helper_find(helpname, u3,
  3038. nf_ct_protonum(ct));
  3039. if (helper) {
  3040. err = -EAGAIN;
  3041. goto err_rcu;
  3042. }
  3043. rcu_read_unlock();
  3044. #endif
  3045. err = -EOPNOTSUPP;
  3046. goto err_ct;
  3047. }
  3048. }
  3049. exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
  3050. if (IS_ERR(exp)) {
  3051. err = PTR_ERR(exp);
  3052. goto err_rcu;
  3053. }
  3054. err = nf_ct_expect_related_report(exp, portid, report, 0);
  3055. nf_ct_expect_put(exp);
  3056. err_rcu:
  3057. rcu_read_unlock();
  3058. err_ct:
  3059. nf_ct_put(ct);
  3060. return err;
  3061. }
  3062. static int ctnetlink_new_expect(struct net *net, struct sock *ctnl,
  3063. struct sk_buff *skb, const struct nlmsghdr *nlh,
  3064. const struct nlattr * const cda[],
  3065. struct netlink_ext_ack *extack)
  3066. {
  3067. struct nf_conntrack_tuple tuple;
  3068. struct nf_conntrack_expect *exp;
  3069. struct nfgenmsg *nfmsg = nlmsg_data(nlh);
  3070. u_int8_t u3 = nfmsg->nfgen_family;
  3071. struct nf_conntrack_zone zone;
  3072. int err;
  3073. if (!cda[CTA_EXPECT_TUPLE]
  3074. || !cda[CTA_EXPECT_MASK]
  3075. || !cda[CTA_EXPECT_MASTER])
  3076. return -EINVAL;
  3077. err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
  3078. if (err < 0)
  3079. return err;
  3080. err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
  3081. u3, NULL);
  3082. if (err < 0)
  3083. return err;
  3084. spin_lock_bh(&nf_conntrack_expect_lock);
  3085. exp = __nf_ct_expect_find(net, &zone, &tuple);
  3086. if (!exp) {
  3087. spin_unlock_bh(&nf_conntrack_expect_lock);
  3088. err = -ENOENT;
  3089. if (nlh->nlmsg_flags & NLM_F_CREATE) {
  3090. err = ctnetlink_create_expect(net, &zone, cda, u3,
  3091. NETLINK_CB(skb).portid,
  3092. nlmsg_report(nlh));
  3093. }
  3094. return err;
  3095. }
  3096. err = -EEXIST;
  3097. if (!(nlh->nlmsg_flags & NLM_F_EXCL))
  3098. err = ctnetlink_change_expect(exp, cda);
  3099. spin_unlock_bh(&nf_conntrack_expect_lock);
  3100. return err;
  3101. }
  3102. static int
  3103. ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
  3104. const struct ip_conntrack_stat *st)
  3105. {
  3106. struct nlmsghdr *nlh;
  3107. struct nfgenmsg *nfmsg;
  3108. unsigned int flags = portid ? NLM_F_MULTI : 0, event;
  3109. event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
  3110. IPCTNL_MSG_EXP_GET_STATS_CPU);
  3111. nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
  3112. if (nlh == NULL)
  3113. goto nlmsg_failure;
  3114. nfmsg = nlmsg_data(nlh);
  3115. nfmsg->nfgen_family = AF_UNSPEC;
  3116. nfmsg->version = NFNETLINK_V0;
  3117. nfmsg->res_id = htons(cpu);
  3118. if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
  3119. nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
  3120. nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
  3121. goto nla_put_failure;
  3122. nlmsg_end(skb, nlh);
  3123. return skb->len;
  3124. nla_put_failure:
  3125. nlmsg_failure:
  3126. nlmsg_cancel(skb, nlh);
  3127. return -1;
  3128. }
  3129. static int
  3130. ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
  3131. {
  3132. int cpu;
  3133. struct net *net = sock_net(skb->sk);
  3134. if (cb->args[0] == nr_cpu_ids)
  3135. return 0;
  3136. for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
  3137. const struct ip_conntrack_stat *st;
  3138. if (!cpu_possible(cpu))
  3139. continue;
  3140. st = per_cpu_ptr(net->ct.stat, cpu);
  3141. if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
  3142. cb->nlh->nlmsg_seq,
  3143. cpu, st) < 0)
  3144. break;
  3145. }
  3146. cb->args[0] = cpu;
  3147. return skb->len;
  3148. }
  3149. static int ctnetlink_stat_exp_cpu(struct net *net, struct sock *ctnl,
  3150. struct sk_buff *skb,
  3151. const struct nlmsghdr *nlh,
  3152. const struct nlattr * const cda[],
  3153. struct netlink_ext_ack *extack)
  3154. {
  3155. if (nlh->nlmsg_flags & NLM_F_DUMP) {
  3156. struct netlink_dump_control c = {
  3157. .dump = ctnetlink_exp_stat_cpu_dump,
  3158. };
  3159. return netlink_dump_start(ctnl, skb, nlh, &c);
  3160. }
  3161. return 0;
  3162. }
  3163. #ifdef CONFIG_NF_CONNTRACK_EVENTS
  3164. static struct nf_ct_event_notifier ctnl_notifier = {
  3165. .fcn = ctnetlink_conntrack_event,
  3166. };
  3167. static struct nf_exp_event_notifier ctnl_notifier_exp = {
  3168. .fcn = ctnetlink_expect_event,
  3169. };
  3170. #endif
  3171. static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
  3172. [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
  3173. .attr_count = CTA_MAX,
  3174. .policy = ct_nla_policy },
  3175. [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
  3176. .attr_count = CTA_MAX,
  3177. .policy = ct_nla_policy },
  3178. [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
  3179. .attr_count = CTA_MAX,
  3180. .policy = ct_nla_policy },
  3181. [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
  3182. .attr_count = CTA_MAX,
  3183. .policy = ct_nla_policy },
  3184. [IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
  3185. [IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
  3186. [IPCTNL_MSG_CT_GET_DYING] = { .call = ctnetlink_get_ct_dying },
  3187. [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
  3188. };
  3189. static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
  3190. [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
  3191. .attr_count = CTA_EXPECT_MAX,
  3192. .policy = exp_nla_policy },
  3193. [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
  3194. .attr_count = CTA_EXPECT_MAX,
  3195. .policy = exp_nla_policy },
  3196. [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
  3197. .attr_count = CTA_EXPECT_MAX,
  3198. .policy = exp_nla_policy },
  3199. [IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
  3200. };
  3201. static const struct nfnetlink_subsystem ctnl_subsys = {
  3202. .name = "conntrack",
  3203. .subsys_id = NFNL_SUBSYS_CTNETLINK,
  3204. .cb_count = IPCTNL_MSG_MAX,
  3205. .cb = ctnl_cb,
  3206. };
  3207. static const struct nfnetlink_subsystem ctnl_exp_subsys = {
  3208. .name = "conntrack_expect",
  3209. .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
  3210. .cb_count = IPCTNL_MSG_EXP_MAX,
  3211. .cb = ctnl_exp_cb,
  3212. };
  3213. MODULE_ALIAS("ip_conntrack_netlink");
  3214. MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
  3215. MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
  3216. static int __net_init ctnetlink_net_init(struct net *net)
  3217. {
  3218. #ifdef CONFIG_NF_CONNTRACK_EVENTS
  3219. int ret;
  3220. ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
  3221. if (ret < 0) {
  3222. pr_err("ctnetlink_init: cannot register notifier.\n");
  3223. goto err_out;
  3224. }
  3225. ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
  3226. if (ret < 0) {
  3227. pr_err("ctnetlink_init: cannot expect register notifier.\n");
  3228. goto err_unreg_notifier;
  3229. }
  3230. #endif
  3231. return 0;
  3232. #ifdef CONFIG_NF_CONNTRACK_EVENTS
  3233. err_unreg_notifier:
  3234. nf_conntrack_unregister_notifier(net, &ctnl_notifier);
  3235. err_out:
  3236. return ret;
  3237. #endif
  3238. }
  3239. static void ctnetlink_net_exit(struct net *net)
  3240. {
  3241. #ifdef CONFIG_NF_CONNTRACK_EVENTS
  3242. nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
  3243. nf_conntrack_unregister_notifier(net, &ctnl_notifier);
  3244. #endif
  3245. }
  3246. static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
  3247. {
  3248. struct net *net;
  3249. list_for_each_entry(net, net_exit_list, exit_list)
  3250. ctnetlink_net_exit(net);
  3251. /* wait for other cpus until they are done with ctnl_notifiers */
  3252. synchronize_rcu();
  3253. }
  3254. static struct pernet_operations ctnetlink_net_ops = {
  3255. .init = ctnetlink_net_init,
  3256. .exit_batch = ctnetlink_net_exit_batch,
  3257. };
  3258. static int __init ctnetlink_init(void)
  3259. {
  3260. int ret;
  3261. ret = nfnetlink_subsys_register(&ctnl_subsys);
  3262. if (ret < 0) {
  3263. pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
  3264. goto err_out;
  3265. }
  3266. ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
  3267. if (ret < 0) {
  3268. pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
  3269. goto err_unreg_subsys;
  3270. }
  3271. ret = register_pernet_subsys(&ctnetlink_net_ops);
  3272. if (ret < 0) {
  3273. pr_err("ctnetlink_init: cannot register pernet operations\n");
  3274. goto err_unreg_exp_subsys;
  3275. }
  3276. #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
  3277. /* setup interaction between nf_queue and nf_conntrack_netlink. */
  3278. RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
  3279. #endif
  3280. return 0;
  3281. err_unreg_exp_subsys:
  3282. nfnetlink_subsys_unregister(&ctnl_exp_subsys);
  3283. err_unreg_subsys:
  3284. nfnetlink_subsys_unregister(&ctnl_subsys);
  3285. err_out:
  3286. return ret;
  3287. }
  3288. static void __exit ctnetlink_exit(void)
  3289. {
  3290. unregister_pernet_subsys(&ctnetlink_net_ops);
  3291. nfnetlink_subsys_unregister(&ctnl_exp_subsys);
  3292. nfnetlink_subsys_unregister(&ctnl_subsys);
  3293. #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
  3294. RCU_INIT_POINTER(nfnl_ct_hook, NULL);
  3295. #endif
  3296. synchronize_rcu();
  3297. }
  3298. module_init(ctnetlink_init);
  3299. module_exit(ctnetlink_exit);