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Commit | Line | Data |
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96518518 | 1 | /* |
ef1f7df9 | 2 | * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> |
25443261 | 3 | * Copyright (c) 2016 Pablo Neira Ayuso <pablo@netfilter.org> |
96518518 PM |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * Development of this code funded by Astaro AG (http://www.astaro.com/) | |
10 | */ | |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/netlink.h> | |
16 | #include <linux/netfilter.h> | |
17 | #include <linux/netfilter/nf_tables.h> | |
18 | #include <net/netfilter/nf_tables.h> | |
19 | #include <net/netfilter/nf_conntrack.h> | |
48f66c90 | 20 | #include <net/netfilter/nf_conntrack_acct.h> |
96518518 PM |
21 | #include <net/netfilter/nf_conntrack_tuple.h> |
22 | #include <net/netfilter/nf_conntrack_helper.h> | |
c4ede3d3 | 23 | #include <net/netfilter/nf_conntrack_ecache.h> |
d2bf2f34 | 24 | #include <net/netfilter/nf_conntrack_labels.h> |
96518518 PM |
25 | |
26 | struct nft_ct { | |
27 | enum nft_ct_keys key:8; | |
28 | enum ip_conntrack_dir dir:8; | |
d46f2cd2 | 29 | union { |
c4ede3d3 KE |
30 | enum nft_registers dreg:8; |
31 | enum nft_registers sreg:8; | |
32 | }; | |
96518518 PM |
33 | }; |
34 | ||
48f66c90 FW |
35 | static u64 nft_ct_get_eval_counter(const struct nf_conn_counter *c, |
36 | enum nft_ct_keys k, | |
37 | enum ip_conntrack_dir d) | |
38 | { | |
39 | if (d < IP_CT_DIR_MAX) | |
40 | return k == NFT_CT_BYTES ? atomic64_read(&c[d].bytes) : | |
41 | atomic64_read(&c[d].packets); | |
42 | ||
43 | return nft_ct_get_eval_counter(c, k, IP_CT_DIR_ORIGINAL) + | |
44 | nft_ct_get_eval_counter(c, k, IP_CT_DIR_REPLY); | |
45 | } | |
46 | ||
c4ede3d3 | 47 | static void nft_ct_get_eval(const struct nft_expr *expr, |
a55e22e9 | 48 | struct nft_regs *regs, |
c4ede3d3 | 49 | const struct nft_pktinfo *pkt) |
96518518 PM |
50 | { |
51 | const struct nft_ct *priv = nft_expr_priv(expr); | |
49499c3e | 52 | u32 *dest = ®s->data[priv->dreg]; |
96518518 PM |
53 | enum ip_conntrack_info ctinfo; |
54 | const struct nf_conn *ct; | |
55 | const struct nf_conn_help *help; | |
56 | const struct nf_conntrack_tuple *tuple; | |
57 | const struct nf_conntrack_helper *helper; | |
96518518 PM |
58 | unsigned int state; |
59 | ||
60 | ct = nf_ct_get(pkt->skb, &ctinfo); | |
61 | ||
62 | switch (priv->key) { | |
63 | case NFT_CT_STATE: | |
64 | if (ct == NULL) | |
65 | state = NF_CT_STATE_INVALID_BIT; | |
66 | else if (nf_ct_is_untracked(ct)) | |
67 | state = NF_CT_STATE_UNTRACKED_BIT; | |
68 | else | |
69 | state = NF_CT_STATE_BIT(ctinfo); | |
fad136ea | 70 | *dest = state; |
96518518 | 71 | return; |
c1f86676 DM |
72 | default: |
73 | break; | |
96518518 PM |
74 | } |
75 | ||
76 | if (ct == NULL) | |
77 | goto err; | |
78 | ||
79 | switch (priv->key) { | |
80 | case NFT_CT_DIRECTION: | |
fad136ea | 81 | *dest = CTINFO2DIR(ctinfo); |
96518518 PM |
82 | return; |
83 | case NFT_CT_STATUS: | |
fad136ea | 84 | *dest = ct->status; |
96518518 PM |
85 | return; |
86 | #ifdef CONFIG_NF_CONNTRACK_MARK | |
87 | case NFT_CT_MARK: | |
fad136ea | 88 | *dest = ct->mark; |
96518518 PM |
89 | return; |
90 | #endif | |
91 | #ifdef CONFIG_NF_CONNTRACK_SECMARK | |
92 | case NFT_CT_SECMARK: | |
fad136ea | 93 | *dest = ct->secmark; |
96518518 PM |
94 | return; |
95 | #endif | |
96 | case NFT_CT_EXPIRATION: | |
c8607e02 | 97 | *dest = jiffies_to_msecs(nf_ct_expires(ct)); |
96518518 PM |
98 | return; |
99 | case NFT_CT_HELPER: | |
100 | if (ct->master == NULL) | |
101 | goto err; | |
102 | help = nfct_help(ct->master); | |
103 | if (help == NULL) | |
104 | goto err; | |
105 | helper = rcu_dereference(help->helper); | |
106 | if (helper == NULL) | |
107 | goto err; | |
fad136ea | 108 | strncpy((char *)dest, helper->name, NF_CT_HELPER_NAME_LEN); |
96518518 | 109 | return; |
d2bf2f34 FW |
110 | #ifdef CONFIG_NF_CONNTRACK_LABELS |
111 | case NFT_CT_LABELS: { | |
112 | struct nf_conn_labels *labels = nf_ct_labels_find(ct); | |
d2bf2f34 | 113 | |
23014011 FW |
114 | if (labels) |
115 | memcpy(dest, labels->bits, NF_CT_LABELS_MAX_SIZE); | |
116 | else | |
fad136ea | 117 | memset(dest, 0, NF_CT_LABELS_MAX_SIZE); |
d2bf2f34 FW |
118 | return; |
119 | } | |
efaea94a | 120 | #endif |
48f66c90 FW |
121 | case NFT_CT_BYTES: /* fallthrough */ |
122 | case NFT_CT_PKTS: { | |
123 | const struct nf_conn_acct *acct = nf_conn_acct_find(ct); | |
124 | u64 count = 0; | |
125 | ||
126 | if (acct) | |
127 | count = nft_ct_get_eval_counter(acct->counter, | |
128 | priv->key, priv->dir); | |
129 | memcpy(dest, &count, sizeof(count)); | |
130 | return; | |
131 | } | |
d767ff2c LZ |
132 | case NFT_CT_L3PROTOCOL: |
133 | *dest = nf_ct_l3num(ct); | |
134 | return; | |
135 | case NFT_CT_PROTOCOL: | |
136 | *dest = nf_ct_protonum(ct); | |
137 | return; | |
c1f86676 DM |
138 | default: |
139 | break; | |
96518518 PM |
140 | } |
141 | ||
142 | tuple = &ct->tuplehash[priv->dir].tuple; | |
143 | switch (priv->key) { | |
96518518 | 144 | case NFT_CT_SRC: |
fad136ea | 145 | memcpy(dest, tuple->src.u3.all, |
96518518 PM |
146 | nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16); |
147 | return; | |
148 | case NFT_CT_DST: | |
fad136ea | 149 | memcpy(dest, tuple->dst.u3.all, |
96518518 PM |
150 | nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16); |
151 | return; | |
96518518 | 152 | case NFT_CT_PROTO_SRC: |
fad136ea | 153 | *dest = (__force __u16)tuple->src.u.all; |
96518518 PM |
154 | return; |
155 | case NFT_CT_PROTO_DST: | |
fad136ea | 156 | *dest = (__force __u16)tuple->dst.u.all; |
96518518 | 157 | return; |
c1f86676 DM |
158 | default: |
159 | break; | |
96518518 PM |
160 | } |
161 | return; | |
162 | err: | |
a55e22e9 | 163 | regs->verdict.code = NFT_BREAK; |
96518518 PM |
164 | } |
165 | ||
c4ede3d3 | 166 | static void nft_ct_set_eval(const struct nft_expr *expr, |
a55e22e9 | 167 | struct nft_regs *regs, |
c4ede3d3 KE |
168 | const struct nft_pktinfo *pkt) |
169 | { | |
170 | const struct nft_ct *priv = nft_expr_priv(expr); | |
171 | struct sk_buff *skb = pkt->skb; | |
847c8e29 | 172 | #ifdef CONFIG_NF_CONNTRACK_MARK |
49499c3e | 173 | u32 value = regs->data[priv->sreg]; |
847c8e29 | 174 | #endif |
c4ede3d3 KE |
175 | enum ip_conntrack_info ctinfo; |
176 | struct nf_conn *ct; | |
177 | ||
178 | ct = nf_ct_get(skb, &ctinfo); | |
179 | if (ct == NULL) | |
180 | return; | |
181 | ||
182 | switch (priv->key) { | |
183 | #ifdef CONFIG_NF_CONNTRACK_MARK | |
184 | case NFT_CT_MARK: | |
185 | if (ct->mark != value) { | |
186 | ct->mark = value; | |
187 | nf_conntrack_event_cache(IPCT_MARK, ct); | |
188 | } | |
189 | break; | |
1ad8f48d FW |
190 | #endif |
191 | #ifdef CONFIG_NF_CONNTRACK_LABELS | |
192 | case NFT_CT_LABELS: | |
193 | nf_connlabels_replace(ct, | |
194 | ®s->data[priv->sreg], | |
195 | ®s->data[priv->sreg], | |
196 | NF_CT_LABELS_MAX_SIZE / sizeof(u32)); | |
197 | break; | |
c4ede3d3 | 198 | #endif |
c1f86676 DM |
199 | default: |
200 | break; | |
c4ede3d3 KE |
201 | } |
202 | } | |
203 | ||
96518518 PM |
204 | static const struct nla_policy nft_ct_policy[NFTA_CT_MAX + 1] = { |
205 | [NFTA_CT_DREG] = { .type = NLA_U32 }, | |
206 | [NFTA_CT_KEY] = { .type = NLA_U32 }, | |
207 | [NFTA_CT_DIRECTION] = { .type = NLA_U8 }, | |
c4ede3d3 | 208 | [NFTA_CT_SREG] = { .type = NLA_U32 }, |
96518518 PM |
209 | }; |
210 | ||
ecb2421b | 211 | static int nft_ct_netns_get(struct net *net, uint8_t family) |
9638f33e PM |
212 | { |
213 | int err; | |
214 | ||
215 | if (family == NFPROTO_INET) { | |
ecb2421b | 216 | err = nf_ct_netns_get(net, NFPROTO_IPV4); |
9638f33e PM |
217 | if (err < 0) |
218 | goto err1; | |
ecb2421b | 219 | err = nf_ct_netns_get(net, NFPROTO_IPV6); |
9638f33e PM |
220 | if (err < 0) |
221 | goto err2; | |
222 | } else { | |
ecb2421b | 223 | err = nf_ct_netns_get(net, family); |
9638f33e PM |
224 | if (err < 0) |
225 | goto err1; | |
226 | } | |
227 | return 0; | |
228 | ||
229 | err2: | |
ecb2421b | 230 | nf_ct_netns_put(net, NFPROTO_IPV4); |
9638f33e PM |
231 | err1: |
232 | return err; | |
233 | } | |
234 | ||
ecb2421b | 235 | static void nft_ct_netns_put(struct net *net, uint8_t family) |
9638f33e PM |
236 | { |
237 | if (family == NFPROTO_INET) { | |
ecb2421b FW |
238 | nf_ct_netns_put(net, NFPROTO_IPV4); |
239 | nf_ct_netns_put(net, NFPROTO_IPV6); | |
9638f33e | 240 | } else |
ecb2421b | 241 | nf_ct_netns_put(net, family); |
9638f33e PM |
242 | } |
243 | ||
fe92ca45 PM |
244 | static int nft_ct_get_init(const struct nft_ctx *ctx, |
245 | const struct nft_expr *expr, | |
246 | const struct nlattr * const tb[]) | |
96518518 PM |
247 | { |
248 | struct nft_ct *priv = nft_expr_priv(expr); | |
45d9bcda | 249 | unsigned int len; |
fe92ca45 | 250 | int err; |
96518518 | 251 | |
fe92ca45 | 252 | priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY])); |
96518518 | 253 | switch (priv->key) { |
96518518 | 254 | case NFT_CT_DIRECTION: |
45d9bcda PM |
255 | if (tb[NFTA_CT_DIRECTION] != NULL) |
256 | return -EINVAL; | |
257 | len = sizeof(u8); | |
258 | break; | |
259 | case NFT_CT_STATE: | |
96518518 PM |
260 | case NFT_CT_STATUS: |
261 | #ifdef CONFIG_NF_CONNTRACK_MARK | |
262 | case NFT_CT_MARK: | |
263 | #endif | |
264 | #ifdef CONFIG_NF_CONNTRACK_SECMARK | |
265 | case NFT_CT_SECMARK: | |
d2bf2f34 | 266 | #endif |
45d9bcda PM |
267 | case NFT_CT_EXPIRATION: |
268 | if (tb[NFTA_CT_DIRECTION] != NULL) | |
269 | return -EINVAL; | |
270 | len = sizeof(u32); | |
271 | break; | |
d2bf2f34 FW |
272 | #ifdef CONFIG_NF_CONNTRACK_LABELS |
273 | case NFT_CT_LABELS: | |
45d9bcda PM |
274 | if (tb[NFTA_CT_DIRECTION] != NULL) |
275 | return -EINVAL; | |
276 | len = NF_CT_LABELS_MAX_SIZE; | |
277 | break; | |
96518518 | 278 | #endif |
96518518 PM |
279 | case NFT_CT_HELPER: |
280 | if (tb[NFTA_CT_DIRECTION] != NULL) | |
281 | return -EINVAL; | |
45d9bcda | 282 | len = NF_CT_HELPER_NAME_LEN; |
96518518 | 283 | break; |
45d9bcda | 284 | |
51292c07 | 285 | case NFT_CT_L3PROTOCOL: |
96518518 | 286 | case NFT_CT_PROTOCOL: |
d767ff2c LZ |
287 | /* For compatibility, do not report error if NFTA_CT_DIRECTION |
288 | * attribute is specified. | |
289 | */ | |
45d9bcda PM |
290 | len = sizeof(u8); |
291 | break; | |
96518518 PM |
292 | case NFT_CT_SRC: |
293 | case NFT_CT_DST: | |
45d9bcda PM |
294 | if (tb[NFTA_CT_DIRECTION] == NULL) |
295 | return -EINVAL; | |
296 | ||
297 | switch (ctx->afi->family) { | |
298 | case NFPROTO_IPV4: | |
299 | len = FIELD_SIZEOF(struct nf_conntrack_tuple, | |
300 | src.u3.ip); | |
301 | break; | |
302 | case NFPROTO_IPV6: | |
303 | case NFPROTO_INET: | |
304 | len = FIELD_SIZEOF(struct nf_conntrack_tuple, | |
305 | src.u3.ip6); | |
306 | break; | |
307 | default: | |
308 | return -EAFNOSUPPORT; | |
309 | } | |
310 | break; | |
96518518 PM |
311 | case NFT_CT_PROTO_SRC: |
312 | case NFT_CT_PROTO_DST: | |
313 | if (tb[NFTA_CT_DIRECTION] == NULL) | |
314 | return -EINVAL; | |
45d9bcda | 315 | len = FIELD_SIZEOF(struct nf_conntrack_tuple, src.u.all); |
96518518 | 316 | break; |
48f66c90 FW |
317 | case NFT_CT_BYTES: |
318 | case NFT_CT_PKTS: | |
319 | /* no direction? return sum of original + reply */ | |
320 | if (tb[NFTA_CT_DIRECTION] == NULL) | |
321 | priv->dir = IP_CT_DIR_MAX; | |
322 | len = sizeof(u64); | |
323 | break; | |
96518518 PM |
324 | default: |
325 | return -EOPNOTSUPP; | |
326 | } | |
327 | ||
fe92ca45 PM |
328 | if (tb[NFTA_CT_DIRECTION] != NULL) { |
329 | priv->dir = nla_get_u8(tb[NFTA_CT_DIRECTION]); | |
330 | switch (priv->dir) { | |
331 | case IP_CT_DIR_ORIGINAL: | |
332 | case IP_CT_DIR_REPLY: | |
333 | break; | |
334 | default: | |
335 | return -EINVAL; | |
336 | } | |
337 | } | |
338 | ||
b1c96ed3 | 339 | priv->dreg = nft_parse_register(tb[NFTA_CT_DREG]); |
1ec10212 PM |
340 | err = nft_validate_register_store(ctx, priv->dreg, NULL, |
341 | NFT_DATA_VALUE, len); | |
fe92ca45 PM |
342 | if (err < 0) |
343 | return err; | |
344 | ||
ecb2421b | 345 | err = nft_ct_netns_get(ctx->net, ctx->afi->family); |
fe92ca45 PM |
346 | if (err < 0) |
347 | return err; | |
348 | ||
3f8b61b7 LZ |
349 | if (priv->key == NFT_CT_BYTES || priv->key == NFT_CT_PKTS) |
350 | nf_ct_set_acct(ctx->net, true); | |
351 | ||
c4ede3d3 KE |
352 | return 0; |
353 | } | |
354 | ||
fe92ca45 PM |
355 | static int nft_ct_set_init(const struct nft_ctx *ctx, |
356 | const struct nft_expr *expr, | |
357 | const struct nlattr * const tb[]) | |
c4ede3d3 | 358 | { |
fe92ca45 | 359 | struct nft_ct *priv = nft_expr_priv(expr); |
590025a2 | 360 | bool label_got = false; |
d07db988 | 361 | unsigned int len; |
fe92ca45 PM |
362 | int err; |
363 | ||
364 | priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY])); | |
365 | switch (priv->key) { | |
e88e514e | 366 | #ifdef CONFIG_NF_CONNTRACK_MARK |
c4ede3d3 | 367 | case NFT_CT_MARK: |
7bfdde70 LZ |
368 | if (tb[NFTA_CT_DIRECTION]) |
369 | return -EINVAL; | |
d07db988 | 370 | len = FIELD_SIZEOF(struct nf_conn, mark); |
c4ede3d3 | 371 | break; |
1ad8f48d FW |
372 | #endif |
373 | #ifdef CONFIG_NF_CONNTRACK_LABELS | |
374 | case NFT_CT_LABELS: | |
375 | if (tb[NFTA_CT_DIRECTION]) | |
376 | return -EINVAL; | |
377 | len = NF_CT_LABELS_MAX_SIZE; | |
378 | err = nf_connlabels_get(ctx->net, (len * BITS_PER_BYTE) - 1); | |
379 | if (err) | |
380 | return err; | |
590025a2 | 381 | label_got = true; |
1ad8f48d | 382 | break; |
e88e514e | 383 | #endif |
c4ede3d3 KE |
384 | default: |
385 | return -EOPNOTSUPP; | |
386 | } | |
387 | ||
b1c96ed3 | 388 | priv->sreg = nft_parse_register(tb[NFTA_CT_SREG]); |
d07db988 | 389 | err = nft_validate_register_load(priv->sreg, len); |
fe92ca45 | 390 | if (err < 0) |
590025a2 | 391 | goto err1; |
c4ede3d3 | 392 | |
ecb2421b | 393 | err = nft_ct_netns_get(ctx->net, ctx->afi->family); |
96518518 | 394 | if (err < 0) |
590025a2 | 395 | goto err1; |
96518518 | 396 | |
96518518 | 397 | return 0; |
590025a2 LZ |
398 | |
399 | err1: | |
400 | if (label_got) | |
401 | nf_connlabels_put(ctx->net); | |
402 | return err; | |
403 | } | |
404 | ||
405 | static void nft_ct_get_destroy(const struct nft_ctx *ctx, | |
406 | const struct nft_expr *expr) | |
407 | { | |
ecb2421b | 408 | nf_ct_netns_put(ctx->net, ctx->afi->family); |
96518518 PM |
409 | } |
410 | ||
590025a2 LZ |
411 | static void nft_ct_set_destroy(const struct nft_ctx *ctx, |
412 | const struct nft_expr *expr) | |
96518518 | 413 | { |
1ad8f48d FW |
414 | struct nft_ct *priv = nft_expr_priv(expr); |
415 | ||
416 | switch (priv->key) { | |
417 | #ifdef CONFIG_NF_CONNTRACK_LABELS | |
418 | case NFT_CT_LABELS: | |
419 | nf_connlabels_put(ctx->net); | |
420 | break; | |
421 | #endif | |
422 | default: | |
423 | break; | |
424 | } | |
425 | ||
ecb2421b | 426 | nft_ct_netns_put(ctx->net, ctx->afi->family); |
96518518 PM |
427 | } |
428 | ||
c4ede3d3 | 429 | static int nft_ct_get_dump(struct sk_buff *skb, const struct nft_expr *expr) |
96518518 PM |
430 | { |
431 | const struct nft_ct *priv = nft_expr_priv(expr); | |
432 | ||
b1c96ed3 | 433 | if (nft_dump_register(skb, NFTA_CT_DREG, priv->dreg)) |
96518518 PM |
434 | goto nla_put_failure; |
435 | if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key))) | |
436 | goto nla_put_failure; | |
2a53bfb3 AB |
437 | |
438 | switch (priv->key) { | |
2a53bfb3 AB |
439 | case NFT_CT_SRC: |
440 | case NFT_CT_DST: | |
441 | case NFT_CT_PROTO_SRC: | |
442 | case NFT_CT_PROTO_DST: | |
443 | if (nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir)) | |
444 | goto nla_put_failure; | |
48f66c90 FW |
445 | break; |
446 | case NFT_CT_BYTES: | |
447 | case NFT_CT_PKTS: | |
448 | if (priv->dir < IP_CT_DIR_MAX && | |
449 | nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir)) | |
450 | goto nla_put_failure; | |
451 | break; | |
2a53bfb3 AB |
452 | default: |
453 | break; | |
454 | } | |
455 | ||
96518518 PM |
456 | return 0; |
457 | ||
458 | nla_put_failure: | |
459 | return -1; | |
460 | } | |
461 | ||
c4ede3d3 KE |
462 | static int nft_ct_set_dump(struct sk_buff *skb, const struct nft_expr *expr) |
463 | { | |
464 | const struct nft_ct *priv = nft_expr_priv(expr); | |
465 | ||
b1c96ed3 | 466 | if (nft_dump_register(skb, NFTA_CT_SREG, priv->sreg)) |
c4ede3d3 KE |
467 | goto nla_put_failure; |
468 | if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key))) | |
469 | goto nla_put_failure; | |
470 | return 0; | |
471 | ||
472 | nla_put_failure: | |
473 | return -1; | |
474 | } | |
475 | ||
ef1f7df9 | 476 | static struct nft_expr_type nft_ct_type; |
c4ede3d3 | 477 | static const struct nft_expr_ops nft_ct_get_ops = { |
ef1f7df9 | 478 | .type = &nft_ct_type, |
96518518 | 479 | .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)), |
c4ede3d3 | 480 | .eval = nft_ct_get_eval, |
fe92ca45 | 481 | .init = nft_ct_get_init, |
590025a2 | 482 | .destroy = nft_ct_get_destroy, |
c4ede3d3 | 483 | .dump = nft_ct_get_dump, |
ef1f7df9 PM |
484 | }; |
485 | ||
c4ede3d3 KE |
486 | static const struct nft_expr_ops nft_ct_set_ops = { |
487 | .type = &nft_ct_type, | |
488 | .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)), | |
489 | .eval = nft_ct_set_eval, | |
fe92ca45 | 490 | .init = nft_ct_set_init, |
590025a2 | 491 | .destroy = nft_ct_set_destroy, |
c4ede3d3 KE |
492 | .dump = nft_ct_set_dump, |
493 | }; | |
494 | ||
495 | static const struct nft_expr_ops * | |
496 | nft_ct_select_ops(const struct nft_ctx *ctx, | |
497 | const struct nlattr * const tb[]) | |
498 | { | |
499 | if (tb[NFTA_CT_KEY] == NULL) | |
500 | return ERR_PTR(-EINVAL); | |
501 | ||
502 | if (tb[NFTA_CT_DREG] && tb[NFTA_CT_SREG]) | |
503 | return ERR_PTR(-EINVAL); | |
504 | ||
505 | if (tb[NFTA_CT_DREG]) | |
506 | return &nft_ct_get_ops; | |
507 | ||
508 | if (tb[NFTA_CT_SREG]) | |
509 | return &nft_ct_set_ops; | |
510 | ||
511 | return ERR_PTR(-EINVAL); | |
512 | } | |
513 | ||
ef1f7df9 PM |
514 | static struct nft_expr_type nft_ct_type __read_mostly = { |
515 | .name = "ct", | |
c4ede3d3 | 516 | .select_ops = &nft_ct_select_ops, |
96518518 PM |
517 | .policy = nft_ct_policy, |
518 | .maxattr = NFTA_CT_MAX, | |
ef1f7df9 | 519 | .owner = THIS_MODULE, |
96518518 PM |
520 | }; |
521 | ||
25443261 PNA |
522 | static void nft_notrack_eval(const struct nft_expr *expr, |
523 | struct nft_regs *regs, | |
524 | const struct nft_pktinfo *pkt) | |
525 | { | |
526 | struct sk_buff *skb = pkt->skb; | |
527 | enum ip_conntrack_info ctinfo; | |
528 | struct nf_conn *ct; | |
529 | ||
530 | ct = nf_ct_get(pkt->skb, &ctinfo); | |
531 | /* Previously seen (loopback or untracked)? Ignore. */ | |
532 | if (ct) | |
533 | return; | |
534 | ||
535 | ct = nf_ct_untracked_get(); | |
536 | atomic_inc(&ct->ct_general.use); | |
537 | skb->nfct = &ct->ct_general; | |
538 | skb->nfctinfo = IP_CT_NEW; | |
539 | } | |
540 | ||
541 | static struct nft_expr_type nft_notrack_type; | |
542 | static const struct nft_expr_ops nft_notrack_ops = { | |
543 | .type = &nft_notrack_type, | |
544 | .size = NFT_EXPR_SIZE(0), | |
545 | .eval = nft_notrack_eval, | |
546 | }; | |
547 | ||
548 | static struct nft_expr_type nft_notrack_type __read_mostly = { | |
549 | .name = "notrack", | |
550 | .ops = &nft_notrack_ops, | |
551 | .owner = THIS_MODULE, | |
552 | }; | |
553 | ||
96518518 PM |
554 | static int __init nft_ct_module_init(void) |
555 | { | |
25443261 PNA |
556 | int err; |
557 | ||
adff6c65 FW |
558 | BUILD_BUG_ON(NF_CT_LABELS_MAX_SIZE > NFT_REG_SIZE); |
559 | ||
25443261 PNA |
560 | err = nft_register_expr(&nft_ct_type); |
561 | if (err < 0) | |
562 | return err; | |
563 | ||
564 | err = nft_register_expr(&nft_notrack_type); | |
565 | if (err < 0) | |
566 | goto err1; | |
567 | ||
568 | return 0; | |
569 | err1: | |
570 | nft_unregister_expr(&nft_ct_type); | |
571 | return err; | |
96518518 PM |
572 | } |
573 | ||
574 | static void __exit nft_ct_module_exit(void) | |
575 | { | |
25443261 | 576 | nft_unregister_expr(&nft_notrack_type); |
ef1f7df9 | 577 | nft_unregister_expr(&nft_ct_type); |
96518518 PM |
578 | } |
579 | ||
580 | module_init(nft_ct_module_init); | |
581 | module_exit(nft_ct_module_exit); | |
582 | ||
583 | MODULE_LICENSE("GPL"); | |
584 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
585 | MODULE_ALIAS_NFT_EXPR("ct"); | |
25443261 | 586 | MODULE_ALIAS_NFT_EXPR("notrack"); |