libnl: /data/src/libnl3/lib/netfilter/ct.c Source File

libnl 3.7.0

ct.c
1 /* SPDX-License-Identifier: LGPL-2.1-only */
2 /*
3 * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
4 * Copyright (c) 2007 Philip Craig <philipc@snapgear.com>
5 * Copyright (c) 2007 Secure Computing Corporation
6 * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
7 */
8
9 /**
10 * @ingroup nfnl
11 * @defgroup ct Conntrack
12 * @brief
13 * @{
14 */
15
16 #include <byteswap.h>
17 #include <sys/types.h>
18 #include <linux/netfilter/nfnetlink_conntrack.h>
19
20 #include <netlink-private/netlink.h>
21 #include <netlink/attr.h>
22 #include <netlink/netfilter/nfnl.h>
23 #include <netlink/netfilter/ct.h>
24 #include <netlink-private/utils.h>
25
26 static struct nl_cache_ops nfnl_ct_ops;
27
28
29 static struct nla_policy ct_policy[CTA_MAX+1] = {
30 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
31 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
32 [CTA_STATUS] = { .type = NLA_U32 },
33 [CTA_PROTOINFO] = { .type = NLA_NESTED },
34 //[CTA_HELP]
35 //[CTA_NAT_SRC]
36 [CTA_TIMEOUT] = { .type = NLA_U32 },
37 [CTA_MARK] = { .type = NLA_U32 },
38 [CTA_COUNTERS_ORIG] = { .type = NLA_NESTED },
39 [CTA_COUNTERS_REPLY] = { .type = NLA_NESTED },
40 [CTA_USE] = { .type = NLA_U32 },
41 [CTA_ID] = { .type = NLA_U32 },
42 [CTA_ZONE] = { .type = NLA_U16 },
43 //[CTA_NAT_DST]
44 };
45
46 static struct nla_policy ct_tuple_policy[CTA_TUPLE_MAX+1] = {
47 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
48 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
49 };
50
51 static struct nla_policy ct_ip_policy[CTA_IP_MAX+1] = {
52 [CTA_IP_V4_SRC] = { .type = NLA_U32 },
53 [CTA_IP_V4_DST] = { .type = NLA_U32 },
54 [CTA_IP_V6_SRC] = { .minlen = 16 },
55 [CTA_IP_V6_DST] = { .minlen = 16 },
56 };
57
58 static struct nla_policy ct_proto_policy[CTA_PROTO_MAX+1] = {
59 [CTA_PROTO_NUM] = { .type = NLA_U8 },
60 [CTA_PROTO_SRC_PORT] = { .type = NLA_U16 },
61 [CTA_PROTO_DST_PORT] = { .type = NLA_U16 },
62 [CTA_PROTO_ICMP_ID] = { .type = NLA_U16 },
63 [CTA_PROTO_ICMP_TYPE] = { .type = NLA_U8 },
64 [CTA_PROTO_ICMP_CODE] = { .type = NLA_U8 },
65 [CTA_PROTO_ICMPV6_ID] = { .type = NLA_U16 },
66 [CTA_PROTO_ICMPV6_TYPE] = { .type = NLA_U8 },
67 [CTA_PROTO_ICMPV6_CODE] = { .type = NLA_U8 },
68 };
69
70 static struct nla_policy ct_protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
71 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
72 };
73
74 static struct nla_policy ct_protoinfo_tcp_policy[CTA_PROTOINFO_TCP_MAX+1] = {
75 [CTA_PROTOINFO_TCP_STATE] = { .type = NLA_U8 },
76 [CTA_PROTOINFO_TCP_WSCALE_ORIGINAL] = { .type = NLA_U8 },
77 [CTA_PROTOINFO_TCP_WSCALE_REPLY] = { .type = NLA_U8 },
78 [CTA_PROTOINFO_TCP_FLAGS_ORIGINAL] = { .minlen = 2 },
79 [CTA_PROTOINFO_TCP_FLAGS_REPLY] = { .minlen = 2 },
80
81 };
82
83 static struct nla_policy ct_counters_policy[CTA_COUNTERS_MAX+1] = {
84 [CTA_COUNTERS_PACKETS] = { .type = NLA_U64 },
85 [CTA_COUNTERS_BYTES] = { .type = NLA_U64 },
86 [CTA_COUNTERS32_PACKETS]= { .type = NLA_U32 },
87 [CTA_COUNTERS32_BYTES] = { .type = NLA_U32 },
88 };
89
90 static struct nla_policy ct_timestamp_policy[CTA_TIMESTAMP_MAX + 1] = {
91 [CTA_TIMESTAMP_START] = { .type = NLA_U64 },
92 [CTA_TIMESTAMP_STOP] = { .type = NLA_U64 },
93 };
94
95 static int ct_parse_ip(struct nfnl_ct *ct, int repl, struct nlattr *attr)
96 {
97 struct nlattr *tb[CTA_IP_MAX+1];
98 struct nl_addr *addr;
99 int err;
100
101 err = nla_parse_nested(tb, CTA_IP_MAX, attr, ct_ip_policy);
102 if (err < 0)
103 goto errout;
104
105 if (tb[CTA_IP_V4_SRC]) {
106 addr = nl_addr_alloc_attr(tb[CTA_IP_V4_SRC], AF_INET);
107 if (addr == NULL)
108 goto errout_enomem;
109 err = nfnl_ct_set_src(ct, repl, addr);
110 nl_addr_put(addr);
111 if (err < 0)
112 goto errout;
113 }
114 if (tb[CTA_IP_V4_DST]) {
115 addr = nl_addr_alloc_attr(tb[CTA_IP_V4_DST], AF_INET);
116 if (addr == NULL)
117 goto errout_enomem;
118 err = nfnl_ct_set_dst(ct, repl, addr);
119 nl_addr_put(addr);
120 if (err < 0)
121 goto errout;
122 }
123 if (tb[CTA_IP_V6_SRC]) {
124 addr = nl_addr_alloc_attr(tb[CTA_IP_V6_SRC], AF_INET6);
125 if (addr == NULL)
126 goto errout_enomem;
127 err = nfnl_ct_set_src(ct, repl, addr);
128 nl_addr_put(addr);
129 if (err < 0)
130 goto errout;
131 }
132 if (tb[CTA_IP_V6_DST]) {
133 addr = nl_addr_alloc_attr(tb[CTA_IP_V6_DST], AF_INET6);
134 if (addr == NULL)
135 goto errout_enomem;
136 err = nfnl_ct_set_dst(ct, repl, addr);
137 nl_addr_put(addr);
138 if (err < 0)
139 goto errout;
140 }
141
142 return 0;
143
144 errout_enomem:
145 err = -NLE_NOMEM;
146 errout:
147 return err;
148 }
149
150 static int ct_parse_proto(struct nfnl_ct *ct, int repl, struct nlattr *attr)
151 {
152 struct nlattr *tb[CTA_PROTO_MAX+1];
153 int err;
154
155 err = nla_parse_nested(tb, CTA_PROTO_MAX, attr, ct_proto_policy);
156 if (err < 0)
157 return err;
158
159 if (!repl && tb[CTA_PROTO_NUM])
160 nfnl_ct_set_proto(ct, nla_get_u8(tb[CTA_PROTO_NUM]));
161 if (tb[CTA_PROTO_SRC_PORT])
162 nfnl_ct_set_src_port(ct, repl,
163 ntohs(nla_get_u16(tb[CTA_PROTO_SRC_PORT])));
164 if (tb[CTA_PROTO_DST_PORT])
165 nfnl_ct_set_dst_port(ct, repl,
166 ntohs(nla_get_u16(tb[CTA_PROTO_DST_PORT])));
167
168 if (ct->ct_family == AF_INET) {
169 if (tb[CTA_PROTO_ICMP_ID])
170 nfnl_ct_set_icmp_id(ct, repl,
171 ntohs(nla_get_u16(tb[CTA_PROTO_ICMP_ID])));
172 if (tb[CTA_PROTO_ICMP_TYPE])
173 nfnl_ct_set_icmp_type(ct, repl,
174 nla_get_u8(tb[CTA_PROTO_ICMP_TYPE]));
175 if (tb[CTA_PROTO_ICMP_CODE])
176 nfnl_ct_set_icmp_code(ct, repl,
177 nla_get_u8(tb[CTA_PROTO_ICMP_CODE]));
178 } else if (ct->ct_family == AF_INET6) {
179 if (tb[CTA_PROTO_ICMPV6_ID])
180 nfnl_ct_set_icmp_id(ct, repl,
181 ntohs(nla_get_u16(tb[CTA_PROTO_ICMPV6_ID])));
182 if (tb[CTA_PROTO_ICMPV6_TYPE])
183 nfnl_ct_set_icmp_type(ct, repl,
184 nla_get_u8(tb[CTA_PROTO_ICMPV6_TYPE]));
185 if (tb[CTA_PROTO_ICMPV6_CODE])
186 nfnl_ct_set_icmp_code(ct, repl,
187 nla_get_u8(tb[CTA_PROTO_ICMPV6_CODE]));
188 }
189
190 return 0;
191 }
192
193 static int ct_parse_tuple(struct nfnl_ct *ct, int repl, struct nlattr *attr)
194 {
195 struct nlattr *tb[CTA_TUPLE_MAX+1];
196 int err;
197
198 err = nla_parse_nested(tb, CTA_TUPLE_MAX, attr, ct_tuple_policy);
199 if (err < 0)
200 return err;
201
202 if (tb[CTA_TUPLE_IP]) {
203 err = ct_parse_ip(ct, repl, tb[CTA_TUPLE_IP]);
204 if (err < 0)
205 return err;
206 }
207
208 if (tb[CTA_TUPLE_PROTO]) {
209 err = ct_parse_proto(ct, repl, tb[CTA_TUPLE_PROTO]);
210 if (err < 0)
211 return err;
212 }
213
214 return 0;
215 }
216
217 static int ct_parse_protoinfo_tcp(struct nfnl_ct *ct, struct nlattr *attr)
218 {
219 struct nlattr *tb[CTA_PROTOINFO_TCP_MAX+1];
220 int err;
221
222 err = nla_parse_nested(tb, CTA_PROTOINFO_TCP_MAX, attr,
223 ct_protoinfo_tcp_policy);
224 if (err < 0)
225 return err;
226
227 if (tb[CTA_PROTOINFO_TCP_STATE])
228 nfnl_ct_set_tcp_state(ct,
229 nla_get_u8(tb[CTA_PROTOINFO_TCP_STATE]));
230
231 return 0;
232 }
233
234 static int ct_parse_protoinfo(struct nfnl_ct *ct, struct nlattr *attr)
235 {
236 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
237 int err;
238
239 err = nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr,
240 ct_protoinfo_policy);
241 if (err < 0)
242 return err;
243
244 if (tb[CTA_PROTOINFO_TCP]) {
245 err = ct_parse_protoinfo_tcp(ct, tb[CTA_PROTOINFO_TCP]);
246 if (err < 0)
247 return err;
248 }
249
250 return 0;
251 }
252
253 static int ct_parse_counters(struct nfnl_ct *ct, int repl, struct nlattr *attr)
254 {
255 struct nlattr *tb[CTA_COUNTERS_MAX+1];
256 int err;
257
258 err = nla_parse_nested(tb, CTA_COUNTERS_MAX, attr, ct_counters_policy);
259 if (err < 0)
260 return err;
261
262 if (tb[CTA_COUNTERS_PACKETS])
263 nfnl_ct_set_packets(ct, repl,
264 ntohll(nla_get_u64(tb[CTA_COUNTERS_PACKETS])));
265 if (tb[CTA_COUNTERS32_PACKETS])
266 nfnl_ct_set_packets(ct, repl,
267 ntohl(nla_get_u32(tb[CTA_COUNTERS32_PACKETS])));
268 if (tb[CTA_COUNTERS_BYTES])
269 nfnl_ct_set_bytes(ct, repl,
270 ntohll(nla_get_u64(tb[CTA_COUNTERS_BYTES])));
271 if (tb[CTA_COUNTERS32_BYTES])
272 nfnl_ct_set_bytes(ct, repl,
273 ntohl(nla_get_u32(tb[CTA_COUNTERS32_BYTES])));
274
275 return 0;
276 }
277
278 int nfnlmsg_ct_group(struct nlmsghdr *nlh)
279 {
280 switch (nfnlmsg_subtype(nlh)) {
281 case IPCTNL_MSG_CT_NEW:
282 if (nlh->nlmsg_flags & (NLM_F_CREATE|NLM_F_EXCL))
283 return NFNLGRP_CONNTRACK_NEW;
284 else
285 return NFNLGRP_CONNTRACK_UPDATE;
286 case IPCTNL_MSG_CT_DELETE:
287 return NFNLGRP_CONNTRACK_DESTROY;
288 default:
289 return NFNLGRP_NONE;
290 }
291 }
292
293 static int ct_parse_timestamp(struct nfnl_ct *ct, struct nlattr *attr)
294 {
295 struct nlattr *tb[CTA_TIMESTAMP_MAX + 1];
296 int err;
297
298 err = nla_parse_nested(tb, CTA_TIMESTAMP_MAX, attr,
299 ct_timestamp_policy);
300 if (err < 0)
301 return err;
302
303 if (tb[CTA_TIMESTAMP_START] && tb[CTA_TIMESTAMP_STOP])
304 nfnl_ct_set_timestamp(ct,
305 ntohll(nla_get_u64(tb[CTA_TIMESTAMP_START])),
306 ntohll(nla_get_u64(tb[CTA_TIMESTAMP_STOP])));
307
308 return 0;
309 }
310
311 static int _nfnlmsg_ct_parse(struct nlattr **tb, struct nfnl_ct *ct)
312 {
313 int err;
314
315 if (tb[CTA_TUPLE_ORIG]) {
316 err = ct_parse_tuple(ct, 0, tb[CTA_TUPLE_ORIG]);
317 if (err < 0)
318 return err;
319 }
320 if (tb[CTA_TUPLE_REPLY]) {
321 err = ct_parse_tuple(ct, 1, tb[CTA_TUPLE_REPLY]);
322 if (err < 0)
323 return err;
324 }
325
326 if (tb[CTA_PROTOINFO]) {
327 err = ct_parse_protoinfo(ct, tb[CTA_PROTOINFO]);
328 if (err < 0)
329 return err;
330 }
331
332 if (tb[CTA_STATUS])
333 nfnl_ct_set_status(ct, ntohl(nla_get_u32(tb[CTA_STATUS])));
334 if (tb[CTA_TIMEOUT])
335 nfnl_ct_set_timeout(ct, ntohl(nla_get_u32(tb[CTA_TIMEOUT])));
336 if (tb[CTA_MARK])
337 nfnl_ct_set_mark(ct, ntohl(nla_get_u32(tb[CTA_MARK])));
338 if (tb[CTA_USE])
339 nfnl_ct_set_use(ct, ntohl(nla_get_u32(tb[CTA_USE])));
340 if (tb[CTA_ID])
341 nfnl_ct_set_id(ct, ntohl(nla_get_u32(tb[CTA_ID])));
342 if (tb[CTA_ZONE])
343 nfnl_ct_set_zone(ct, ntohs(nla_get_u16(tb[CTA_ZONE])));
344
345 if (tb[CTA_COUNTERS_ORIG]) {
346 err = ct_parse_counters(ct, 0, tb[CTA_COUNTERS_ORIG]);
347 if (err < 0)
348 return err;
349 }
350
351 if (tb[CTA_COUNTERS_REPLY]) {
352 err = ct_parse_counters(ct, 1, tb[CTA_COUNTERS_REPLY]);
353 if (err < 0)
354 return err;
355 }
356
357 if (tb[CTA_TIMESTAMP]) {
358 err = ct_parse_timestamp(ct, tb[CTA_TIMESTAMP]);
359 if (err < 0)
360 return err;
361 }
362
363 return 0;
364 }
365
366 int nfnlmsg_ct_parse(struct nlmsghdr *nlh, struct nfnl_ct **result)
367 {
368 struct nfnl_ct *ct;
369 struct nlattr *tb[CTA_MAX+1];
370 int err;
371
372 ct = nfnl_ct_alloc();
373 if (!ct)
374 return -NLE_NOMEM;
375
376 ct->ce_msgtype = nlh->nlmsg_type;
377
378 err = nlmsg_parse(nlh, sizeof(struct nfgenmsg), tb, CTA_MAX,
379 ct_policy);
380 if (err < 0)
381 goto errout;
382
383 nfnl_ct_set_family(ct, nfnlmsg_family(nlh));
384
385 err = _nfnlmsg_ct_parse(tb, ct);
386 if (err < 0)
387 goto errout;
388
389 *result = ct;
390 return 0;
391 errout:
392 nfnl_ct_put(ct);
393 return err;
394 }
395
396 int nfnlmsg_ct_parse_nested(struct nlattr *attr, struct nfnl_ct **result)
397 {
398 struct nfnl_ct *ct;
399 struct nlattr *tb[CTA_MAX+1];
400 int err;
401
402 ct = nfnl_ct_alloc();
403 if (!ct)
404 return -NLE_NOMEM;
405
406 // msgtype not given for nested
407 //ct->ce_msgtype = nlh->nlmsg_type;
408
409 err = nla_parse_nested(tb, CTA_MAX, attr, ct_policy);
410 if (err < 0)
411 goto errout;
412
413 // family not known
414 //nfnl_ct_set_family(ct, nfnlmsg_family(nlh));
415
416 err = _nfnlmsg_ct_parse(tb, ct);
417 if (err < 0)
418 goto errout;
419
420 *result = ct;
421 return 0;
422 errout:
423 nfnl_ct_put(ct);
424 return err;
425 }
426
427 static int ct_msg_parser(struct nl_cache_ops *ops, struct sockaddr_nl *who,
428 struct nlmsghdr *nlh, struct nl_parser_param *pp)
429 {
430 struct nfnl_ct *ct;
431 int err;
432
433 if ((err = nfnlmsg_ct_parse(nlh, &ct)) < 0)
434 return err;
435
436 err = pp->pp_cb((struct nl_object *) ct, pp);
437 nfnl_ct_put(ct);
438 return err;
439 }
440
441 /**
442 * Send nfnl ct dump request
443 * @arg sk Netlink socket.
444 *
445 * @return 0 on success or a negative error code. Due to a bug, this function
446 * returns the number of bytes sent. Treat any non-negative number as success.
447 */
448 int nfnl_ct_dump_request(struct nl_sock *sk)
449 {
450 return nfnl_send_simple(sk, NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET,
451 NLM_F_DUMP, AF_UNSPEC, 0);
452 }
453
454 static int ct_request_update(struct nl_cache *cache, struct nl_sock *sk)
455 {
456 return nfnl_ct_dump_request(sk);
457 }
458
459 static int nfnl_ct_build_tuple(struct nl_msg *msg, const struct nfnl_ct *ct,
460 int repl)
461 {
462 struct nlattr *tuple, *ip, *proto;
463 struct nl_addr *addr;
464 int family;
465
466 family = nfnl_ct_get_family(ct);
467
468 tuple = nla_nest_start(msg, repl ? CTA_TUPLE_REPLY : CTA_TUPLE_ORIG);
469 if (!tuple)
470 goto nla_put_failure;
471
472 ip = nla_nest_start(msg, CTA_TUPLE_IP);
473 if (!ip)
474 goto nla_put_failure;
475
476 addr = nfnl_ct_get_src(ct, repl);
477 if (addr)
478 NLA_PUT_ADDR(msg,
479 family == AF_INET ? CTA_IP_V4_SRC : CTA_IP_V6_SRC,
480 addr);
481
482 addr = nfnl_ct_get_dst(ct, repl);
483 if (addr)
484 NLA_PUT_ADDR(msg,
485 family == AF_INET ? CTA_IP_V4_DST : CTA_IP_V6_DST,
486 addr);
487
488 nla_nest_end(msg, ip);
489
490 proto = nla_nest_start(msg, CTA_TUPLE_PROTO);
491 if (!proto)
492 goto nla_put_failure;
493
494 if (nfnl_ct_test_proto(ct))
495 NLA_PUT_U8(msg, CTA_PROTO_NUM, nfnl_ct_get_proto(ct));
496
497 if (nfnl_ct_test_src_port(ct, repl))
498 NLA_PUT_U16(msg, CTA_PROTO_SRC_PORT,
499 htons(nfnl_ct_get_src_port(ct, repl)));
500
501 if (nfnl_ct_test_dst_port(ct, repl))
502 NLA_PUT_U16(msg, CTA_PROTO_DST_PORT,
503 htons(nfnl_ct_get_dst_port(ct, repl)));
504
505 if (family == AF_INET) {
506 if (nfnl_ct_test_icmp_id(ct, repl))
507 NLA_PUT_U16(msg, CTA_PROTO_ICMP_ID,
508 htons(nfnl_ct_get_icmp_id(ct, repl)));
509
510 if (nfnl_ct_test_icmp_type(ct, repl))
511 NLA_PUT_U8(msg, CTA_PROTO_ICMP_TYPE,
512 nfnl_ct_get_icmp_type(ct, repl));
513
514 if (nfnl_ct_test_icmp_code(ct, repl))
515 NLA_PUT_U8(msg, CTA_PROTO_ICMP_CODE,
516 nfnl_ct_get_icmp_code(ct, repl));
517 } else if (family == AF_INET6) {
518 if (nfnl_ct_test_icmp_id(ct, repl))
519 NLA_PUT_U16(msg, CTA_PROTO_ICMPV6_ID,
520 htons(nfnl_ct_get_icmp_id(ct, repl)));
521
522 if (nfnl_ct_test_icmp_type(ct, repl))
523 NLA_PUT_U8(msg, CTA_PROTO_ICMPV6_TYPE,
524 nfnl_ct_get_icmp_type(ct, repl));
525
526 if (nfnl_ct_test_icmp_code(ct, repl))
527 NLA_PUT_U8(msg, CTA_PROTO_ICMPV6_CODE,
528 nfnl_ct_get_icmp_code(ct, repl));
529 }
530
531 nla_nest_end(msg, proto);
532
533 nla_nest_end(msg, tuple);
534 return 0;
535
536 nla_put_failure:
537 return -NLE_MSGSIZE;
538 }
539
540 static int nfnl_ct_build_message(const struct nfnl_ct *ct, int cmd, int flags,
541 struct nl_msg **result)
542 {
543 struct nl_msg *msg;
544 int err;
545 int reply = 0;
546
547 msg = nfnlmsg_alloc_simple(NFNL_SUBSYS_CTNETLINK, cmd, flags,
548 nfnl_ct_get_family(ct), 0);
549 if (msg == NULL)
550 return -NLE_NOMEM;
551
552 /* We use REPLY || ORIG, depending on requests. */
553 if (nfnl_ct_get_src(ct, 1) || nfnl_ct_get_dst(ct, 1)) {
554 reply = 1;
555 if ((err = nfnl_ct_build_tuple(msg, ct, 1)) < 0)
556 goto err_out;
557 }
558
559 if (!reply || nfnl_ct_get_src(ct, 0) || nfnl_ct_get_dst(ct, 0)) {
560 if ((err = nfnl_ct_build_tuple(msg, ct, 0)) < 0)
561 goto err_out;
562 }
563
564 if (nfnl_ct_test_status(ct))
565 NLA_PUT_U32(msg, CTA_STATUS, htonl(nfnl_ct_get_status(ct)));
566
567 if (nfnl_ct_test_timeout(ct))
568 NLA_PUT_U32(msg, CTA_TIMEOUT, htonl(nfnl_ct_get_timeout(ct)));
569
570 if (nfnl_ct_test_mark(ct))
571 NLA_PUT_U32(msg, CTA_MARK, htonl(nfnl_ct_get_mark(ct)));
572
573 if (nfnl_ct_test_id(ct))
574 NLA_PUT_U32(msg, CTA_ID, htonl(nfnl_ct_get_id(ct)));
575
576 if (nfnl_ct_test_zone(ct))
577 NLA_PUT_U16(msg, CTA_ZONE, htons(nfnl_ct_get_zone(ct)));
578
579 *result = msg;
580 return 0;
581
582 nla_put_failure:
583 err_out:
584 nlmsg_free(msg);
585 return err;
586 }
587
588 int nfnl_ct_build_add_request(const struct nfnl_ct *ct, int flags,
589 struct nl_msg **result)
590 {
591 return nfnl_ct_build_message(ct, IPCTNL_MSG_CT_NEW, flags, result);
592 }
593
594 int nfnl_ct_add(struct nl_sock *sk, const struct nfnl_ct *ct, int flags)
595 {
596 struct nl_msg *msg;
597 int err;
598
599 if ((err = nfnl_ct_build_add_request(ct, flags, &msg)) < 0)
600 return err;
601
602 err = nl_send_auto_complete(sk, msg);
603 nlmsg_free(msg);
604 if (err < 0)
605 return err;
606
607 return wait_for_ack(sk);
608 }
609
610 int nfnl_ct_build_delete_request(const struct nfnl_ct *ct, int flags,
611 struct nl_msg **result)
612 {
613 return nfnl_ct_build_message(ct, IPCTNL_MSG_CT_DELETE, flags, result);
614 }
615
616 int nfnl_ct_del(struct nl_sock *sk, const struct nfnl_ct *ct, int flags)
617 {
618 struct nl_msg *msg;
619 int err;
620
621 if ((err = nfnl_ct_build_delete_request(ct, flags, &msg)) < 0)
622 return err;
623
624 err = nl_send_auto_complete(sk, msg);
625 nlmsg_free(msg);
626 if (err < 0)
627 return err;
628
629 return wait_for_ack(sk);
630 }
631
632 int nfnl_ct_build_query_request(const struct nfnl_ct *ct, int flags,
633 struct nl_msg **result)
634 {
635 return nfnl_ct_build_message(ct, IPCTNL_MSG_CT_GET, flags, result);
636 }
637
638 int nfnl_ct_query(struct nl_sock *sk, const struct nfnl_ct *ct, int flags)
639 {
640 struct nl_msg *msg;
641 int err;
642
643 if ((err = nfnl_ct_build_query_request(ct, flags, &msg)) < 0)
644 return err;
645
646 err = nl_send_auto_complete(sk, msg);
647 nlmsg_free(msg);
648 if (err < 0)
649 return err;
650
651 return wait_for_ack(sk);
652 }
653
654 /**
655 * @name Cache Management
656 * @{
657 */
658
659 /**
660 * Build a conntrack cache holding all conntrack currently in the kernel
661 * @arg sk Netlink socket.
662 * @arg result Pointer to store resulting cache.
663 *
664 * Allocates a new cache, initializes it properly and updates it to
665 * contain all conntracks currently in the kernel.
666 *
667 * @return 0 on success or a negative error code.
668 */
669 int nfnl_ct_alloc_cache(struct nl_sock *sk, struct nl_cache **result)
670 {
671 return nl_cache_alloc_and_fill(&nfnl_ct_ops, sk, result);
672 }
673
674 /** @} */
675
676 /**
677 * @name Conntrack Addition
678 * @{
679 */
680
681 /** @} */
682
683 static struct nl_af_group ct_groups[] = {
684 { AF_UNSPEC, NFNLGRP_CONNTRACK_NEW },
685 { AF_UNSPEC, NFNLGRP_CONNTRACK_UPDATE },
686 { AF_UNSPEC, NFNLGRP_CONNTRACK_DESTROY },
687 { END_OF_GROUP_LIST },
688 };
689
690 #define NFNLMSG_CT_TYPE(type) NFNLMSG_TYPE(NFNL_SUBSYS_CTNETLINK, (type))
691 static struct nl_cache_ops nfnl_ct_ops = {
692 .co_name = "netfilter/ct",
693 .co_hdrsize = NFNL_HDRLEN,
694 .co_msgtypes = {
695 { NFNLMSG_CT_TYPE(IPCTNL_MSG_CT_NEW), NL_ACT_NEW, "new" },
696 { NFNLMSG_CT_TYPE(IPCTNL_MSG_CT_GET), NL_ACT_GET, "get" },
697 { NFNLMSG_CT_TYPE(IPCTNL_MSG_CT_DELETE), NL_ACT_DEL, "del" },
698 END_OF_MSGTYPES_LIST,
699 },
700 .co_protocol = NETLINK_NETFILTER,
701 .co_groups = ct_groups,
702 .co_request_update = ct_request_update,
703 .co_msg_parser = ct_msg_parser,
704 .co_obj_ops = &ct_obj_ops,
705 };
706
707 static void __init ct_init(void)
708 {
709 nl_cache_mngt_register(&nfnl_ct_ops);
710 }
711
712 static void __exit ct_exit(void)
713 {
714 nl_cache_mngt_unregister(&nfnl_ct_ops);
715 }
716
717 /** @} */
nl_addr_alloc_attr
struct nl_addr * nl_addr_alloc_attr(const struct nlattr *nla, int family)
Allocate abstract address based on Netlink attribute.
Definition: addr.c:256
nl_addr_put
void nl_addr_put(struct nl_addr *addr)
Decrease the reference counter of an abstract address.
Definition: addr.c:533
nla_get_u32
uint32_t nla_get_u32(const struct nlattr *nla)
Return payload of 32 bit integer attribute.
Definition: attr.c:699
nla_get_u16
uint16_t nla_get_u16(const struct nlattr *nla)
Return payload of 16 bit integer attribute.
Definition: attr.c:649
NLA_PUT_U16
#define NLA_PUT_U16(msg, attrtype, value)
Add 16 bit integer attribute to netlink message.
Definition: attr.h:212
NLA_PUT_U8
#define NLA_PUT_U8(msg, attrtype, value)
Add 8 bit integer attribute to netlink message.
Definition: attr.h:194
nla_get_u64
uint64_t nla_get_u64(const struct nlattr *nla)
Return payload of u64 attribute.
Definition: attr.c:754
NLA_PUT_ADDR
#define NLA_PUT_ADDR(msg, attrtype, addr)
Add address attribute to netlink message.
Definition: attr.h:283
NLA_PUT_U32
#define NLA_PUT_U32(msg, attrtype, value)
Add 32 bit integer attribute to netlink message.
Definition: attr.h:230
nla_get_u8
uint8_t nla_get_u8(const struct nlattr *nla)
Return value of 8 bit integer attribute.
Definition: attr.c:599
nla_nest_start
struct nlattr * nla_nest_start(struct nl_msg *msg, int attrtype)
Start a new level of nested attributes.
Definition: attr.c:895
nla_parse_nested
int nla_parse_nested(struct nlattr *tb[], int maxtype, struct nlattr *nla, const struct nla_policy *policy)
Create attribute index based on nested attribute.
Definition: attr.c:1013
nla_nest_end
int nla_nest_end(struct nl_msg *msg, struct nlattr *start)
Finalize nesting of attributes.
Definition: attr.c:958
NLA_U64
@ NLA_U64
64 bit integer
Definition: attr.h:38
NLA_U8
@ NLA_U8
8 bit integer
Definition: attr.h:35
NLA_U16
@ NLA_U16
16 bit integer
Definition: attr.h:36
NLA_NESTED
@ NLA_NESTED
Nested attributes.
Definition: attr.h:42
NLA_U32
@ NLA_U32
32 bit integer
Definition: attr.h:37
nl_cache_mngt_unregister
int nl_cache_mngt_unregister(struct nl_cache_ops *ops)
Unregister a set of cache operations.
Definition: cache_mngt.c:281
nl_cache_mngt_register
int nl_cache_mngt_register(struct nl_cache_ops *ops)
Register a set of cache operations.
Definition: cache_mngt.c:246
nl_cache_alloc_and_fill
int nl_cache_alloc_and_fill(struct nl_cache_ops *ops, struct nl_sock *sock, struct nl_cache **result)
Allocate new cache and fill it.
Definition: cache.c:228
nfnl_ct_alloc_cache
int nfnl_ct_alloc_cache(struct nl_sock *sk, struct nl_cache **result)
Build a conntrack cache holding all conntrack currently in the kernel.
Definition: ct.c:669
nfnl_ct_dump_request
int nfnl_ct_dump_request(struct nl_sock *sk)
Send nfnl ct dump request.
Definition: ct.c:448
nlmsg_free
void nlmsg_free(struct nl_msg *msg)
Release a reference from an netlink message.
Definition: msg.c:558
nlmsg_parse
int nlmsg_parse(struct nlmsghdr *nlh, int hdrlen, struct nlattr *tb[], int maxtype, const struct nla_policy *policy)
parse attributes of a netlink message
Definition: msg.c:208
nfnlmsg_family
uint8_t nfnlmsg_family(struct nlmsghdr *nlh)
Get netfilter family from message.
Definition: nfnl.c:146
nfnl_send_simple
int nfnl_send_simple(struct nl_sock *sk, uint8_t subsys_id, uint8_t type, int flags, uint8_t family, uint16_t res_id)
Send trivial netfilter netlink message.
Definition: nfnl.c:104
nfnlmsg_subtype
uint8_t nfnlmsg_subtype(struct nlmsghdr *nlh)
Get netfilter message type from message.
Definition: nfnl.c:137
nfnlmsg_alloc_simple
struct nl_msg * nfnlmsg_alloc_simple(uint8_t subsys_id, uint8_t type, int flags, uint8_t family, uint16_t res_id)
Allocate a new netfilter netlink message.
Definition: nfnl.c:197
nl_send_auto_complete
int nl_send_auto_complete(struct nl_sock *sk, struct nl_msg *msg)
Definition: nl.c:1241
nla_policy
Attribute validation policy.
Definition: attr.h:63
nla_policy::type
uint16_t type
Type of attribute or NLA_UNSPEC.
Definition: attr.h:65