Commit | Line | Data |
---|---|---|
96518518 | 1 | /* |
ef1f7df9 | 2 | * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> |
96518518 PM |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * Development of this code funded by Astaro AG (http://www.astaro.com/) | |
9 | */ | |
10 | ||
11 | #include <linux/kernel.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/netlink.h> | |
15 | #include <linux/netfilter.h> | |
16 | #include <linux/netfilter/nf_tables.h> | |
17 | #include <net/netfilter/nf_tables.h> | |
18 | #include <net/netfilter/nf_conntrack.h> | |
19 | #include <net/netfilter/nf_conntrack_tuple.h> | |
20 | #include <net/netfilter/nf_conntrack_helper.h> | |
c4ede3d3 | 21 | #include <net/netfilter/nf_conntrack_ecache.h> |
d2bf2f34 | 22 | #include <net/netfilter/nf_conntrack_labels.h> |
96518518 PM |
23 | |
24 | struct nft_ct { | |
25 | enum nft_ct_keys key:8; | |
26 | enum ip_conntrack_dir dir:8; | |
d46f2cd2 | 27 | union { |
c4ede3d3 KE |
28 | enum nft_registers dreg:8; |
29 | enum nft_registers sreg:8; | |
30 | }; | |
96518518 PM |
31 | }; |
32 | ||
c4ede3d3 KE |
33 | static void nft_ct_get_eval(const struct nft_expr *expr, |
34 | struct nft_data data[NFT_REG_MAX + 1], | |
35 | const struct nft_pktinfo *pkt) | |
96518518 PM |
36 | { |
37 | const struct nft_ct *priv = nft_expr_priv(expr); | |
38 | struct nft_data *dest = &data[priv->dreg]; | |
39 | enum ip_conntrack_info ctinfo; | |
40 | const struct nf_conn *ct; | |
41 | const struct nf_conn_help *help; | |
42 | const struct nf_conntrack_tuple *tuple; | |
43 | const struct nf_conntrack_helper *helper; | |
44 | long diff; | |
45 | unsigned int state; | |
46 | ||
47 | ct = nf_ct_get(pkt->skb, &ctinfo); | |
48 | ||
49 | switch (priv->key) { | |
50 | case NFT_CT_STATE: | |
51 | if (ct == NULL) | |
52 | state = NF_CT_STATE_INVALID_BIT; | |
53 | else if (nf_ct_is_untracked(ct)) | |
54 | state = NF_CT_STATE_UNTRACKED_BIT; | |
55 | else | |
56 | state = NF_CT_STATE_BIT(ctinfo); | |
57 | dest->data[0] = state; | |
58 | return; | |
59 | } | |
60 | ||
61 | if (ct == NULL) | |
62 | goto err; | |
63 | ||
64 | switch (priv->key) { | |
65 | case NFT_CT_DIRECTION: | |
66 | dest->data[0] = CTINFO2DIR(ctinfo); | |
67 | return; | |
68 | case NFT_CT_STATUS: | |
69 | dest->data[0] = ct->status; | |
70 | return; | |
71 | #ifdef CONFIG_NF_CONNTRACK_MARK | |
72 | case NFT_CT_MARK: | |
73 | dest->data[0] = ct->mark; | |
74 | return; | |
75 | #endif | |
76 | #ifdef CONFIG_NF_CONNTRACK_SECMARK | |
77 | case NFT_CT_SECMARK: | |
78 | dest->data[0] = ct->secmark; | |
79 | return; | |
80 | #endif | |
81 | case NFT_CT_EXPIRATION: | |
82 | diff = (long)jiffies - (long)ct->timeout.expires; | |
83 | if (diff < 0) | |
84 | diff = 0; | |
85 | dest->data[0] = jiffies_to_msecs(diff); | |
86 | return; | |
87 | case NFT_CT_HELPER: | |
88 | if (ct->master == NULL) | |
89 | goto err; | |
90 | help = nfct_help(ct->master); | |
91 | if (help == NULL) | |
92 | goto err; | |
93 | helper = rcu_dereference(help->helper); | |
94 | if (helper == NULL) | |
95 | goto err; | |
96 | if (strlen(helper->name) >= sizeof(dest->data)) | |
97 | goto err; | |
98 | strncpy((char *)dest->data, helper->name, sizeof(dest->data)); | |
99 | return; | |
d2bf2f34 FW |
100 | #ifdef CONFIG_NF_CONNTRACK_LABELS |
101 | case NFT_CT_LABELS: { | |
102 | struct nf_conn_labels *labels = nf_ct_labels_find(ct); | |
103 | unsigned int size; | |
104 | ||
105 | if (!labels) { | |
106 | memset(dest->data, 0, sizeof(dest->data)); | |
107 | return; | |
108 | } | |
109 | ||
110 | BUILD_BUG_ON(NF_CT_LABELS_MAX_SIZE > sizeof(dest->data)); | |
111 | size = labels->words * sizeof(long); | |
112 | ||
113 | memcpy(dest->data, labels->bits, size); | |
114 | if (size < sizeof(dest->data)) | |
115 | memset(((char *) dest->data) + size, 0, | |
116 | sizeof(dest->data) - size); | |
117 | return; | |
118 | } | |
119 | #endif | |
96518518 PM |
120 | } |
121 | ||
122 | tuple = &ct->tuplehash[priv->dir].tuple; | |
123 | switch (priv->key) { | |
124 | case NFT_CT_L3PROTOCOL: | |
125 | dest->data[0] = nf_ct_l3num(ct); | |
126 | return; | |
127 | case NFT_CT_SRC: | |
128 | memcpy(dest->data, tuple->src.u3.all, | |
129 | nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16); | |
130 | return; | |
131 | case NFT_CT_DST: | |
132 | memcpy(dest->data, tuple->dst.u3.all, | |
133 | nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16); | |
134 | return; | |
135 | case NFT_CT_PROTOCOL: | |
136 | dest->data[0] = nf_ct_protonum(ct); | |
137 | return; | |
138 | case NFT_CT_PROTO_SRC: | |
139 | dest->data[0] = (__force __u16)tuple->src.u.all; | |
140 | return; | |
141 | case NFT_CT_PROTO_DST: | |
142 | dest->data[0] = (__force __u16)tuple->dst.u.all; | |
143 | return; | |
144 | } | |
145 | return; | |
146 | err: | |
147 | data[NFT_REG_VERDICT].verdict = NFT_BREAK; | |
148 | } | |
149 | ||
c4ede3d3 KE |
150 | static void nft_ct_set_eval(const struct nft_expr *expr, |
151 | struct nft_data data[NFT_REG_MAX + 1], | |
152 | const struct nft_pktinfo *pkt) | |
153 | { | |
154 | const struct nft_ct *priv = nft_expr_priv(expr); | |
155 | struct sk_buff *skb = pkt->skb; | |
847c8e29 | 156 | #ifdef CONFIG_NF_CONNTRACK_MARK |
c4ede3d3 | 157 | u32 value = data[priv->sreg].data[0]; |
847c8e29 | 158 | #endif |
c4ede3d3 KE |
159 | enum ip_conntrack_info ctinfo; |
160 | struct nf_conn *ct; | |
161 | ||
162 | ct = nf_ct_get(skb, &ctinfo); | |
163 | if (ct == NULL) | |
164 | return; | |
165 | ||
166 | switch (priv->key) { | |
167 | #ifdef CONFIG_NF_CONNTRACK_MARK | |
168 | case NFT_CT_MARK: | |
169 | if (ct->mark != value) { | |
170 | ct->mark = value; | |
171 | nf_conntrack_event_cache(IPCT_MARK, ct); | |
172 | } | |
173 | break; | |
174 | #endif | |
175 | } | |
176 | } | |
177 | ||
96518518 PM |
178 | static const struct nla_policy nft_ct_policy[NFTA_CT_MAX + 1] = { |
179 | [NFTA_CT_DREG] = { .type = NLA_U32 }, | |
180 | [NFTA_CT_KEY] = { .type = NLA_U32 }, | |
181 | [NFTA_CT_DIRECTION] = { .type = NLA_U8 }, | |
c4ede3d3 | 182 | [NFTA_CT_SREG] = { .type = NLA_U32 }, |
96518518 PM |
183 | }; |
184 | ||
9638f33e PM |
185 | static int nft_ct_l3proto_try_module_get(uint8_t family) |
186 | { | |
187 | int err; | |
188 | ||
189 | if (family == NFPROTO_INET) { | |
190 | err = nf_ct_l3proto_try_module_get(NFPROTO_IPV4); | |
191 | if (err < 0) | |
192 | goto err1; | |
193 | err = nf_ct_l3proto_try_module_get(NFPROTO_IPV6); | |
194 | if (err < 0) | |
195 | goto err2; | |
196 | } else { | |
197 | err = nf_ct_l3proto_try_module_get(family); | |
198 | if (err < 0) | |
199 | goto err1; | |
200 | } | |
201 | return 0; | |
202 | ||
203 | err2: | |
204 | nf_ct_l3proto_module_put(NFPROTO_IPV4); | |
205 | err1: | |
206 | return err; | |
207 | } | |
208 | ||
209 | static void nft_ct_l3proto_module_put(uint8_t family) | |
210 | { | |
211 | if (family == NFPROTO_INET) { | |
212 | nf_ct_l3proto_module_put(NFPROTO_IPV4); | |
213 | nf_ct_l3proto_module_put(NFPROTO_IPV6); | |
214 | } else | |
215 | nf_ct_l3proto_module_put(family); | |
216 | } | |
217 | ||
fe92ca45 PM |
218 | static int nft_ct_get_init(const struct nft_ctx *ctx, |
219 | const struct nft_expr *expr, | |
220 | const struct nlattr * const tb[]) | |
96518518 PM |
221 | { |
222 | struct nft_ct *priv = nft_expr_priv(expr); | |
fe92ca45 | 223 | int err; |
96518518 | 224 | |
fe92ca45 | 225 | priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY])); |
96518518 PM |
226 | switch (priv->key) { |
227 | case NFT_CT_STATE: | |
228 | case NFT_CT_DIRECTION: | |
229 | case NFT_CT_STATUS: | |
230 | #ifdef CONFIG_NF_CONNTRACK_MARK | |
231 | case NFT_CT_MARK: | |
232 | #endif | |
233 | #ifdef CONFIG_NF_CONNTRACK_SECMARK | |
234 | case NFT_CT_SECMARK: | |
d2bf2f34 FW |
235 | #endif |
236 | #ifdef CONFIG_NF_CONNTRACK_LABELS | |
237 | case NFT_CT_LABELS: | |
96518518 PM |
238 | #endif |
239 | case NFT_CT_EXPIRATION: | |
240 | case NFT_CT_HELPER: | |
241 | if (tb[NFTA_CT_DIRECTION] != NULL) | |
242 | return -EINVAL; | |
243 | break; | |
51292c07 | 244 | case NFT_CT_L3PROTOCOL: |
96518518 PM |
245 | case NFT_CT_PROTOCOL: |
246 | case NFT_CT_SRC: | |
247 | case NFT_CT_DST: | |
248 | case NFT_CT_PROTO_SRC: | |
249 | case NFT_CT_PROTO_DST: | |
250 | if (tb[NFTA_CT_DIRECTION] == NULL) | |
251 | return -EINVAL; | |
252 | break; | |
253 | default: | |
254 | return -EOPNOTSUPP; | |
255 | } | |
256 | ||
fe92ca45 PM |
257 | if (tb[NFTA_CT_DIRECTION] != NULL) { |
258 | priv->dir = nla_get_u8(tb[NFTA_CT_DIRECTION]); | |
259 | switch (priv->dir) { | |
260 | case IP_CT_DIR_ORIGINAL: | |
261 | case IP_CT_DIR_REPLY: | |
262 | break; | |
263 | default: | |
264 | return -EINVAL; | |
265 | } | |
266 | } | |
267 | ||
268 | priv->dreg = ntohl(nla_get_be32(tb[NFTA_CT_DREG])); | |
269 | err = nft_validate_output_register(priv->dreg); | |
270 | if (err < 0) | |
271 | return err; | |
272 | ||
273 | err = nft_validate_data_load(ctx, priv->dreg, NULL, NFT_DATA_VALUE); | |
274 | if (err < 0) | |
275 | return err; | |
276 | ||
277 | err = nft_ct_l3proto_try_module_get(ctx->afi->family); | |
278 | if (err < 0) | |
279 | return err; | |
280 | ||
c4ede3d3 KE |
281 | return 0; |
282 | } | |
283 | ||
fe92ca45 PM |
284 | static int nft_ct_set_init(const struct nft_ctx *ctx, |
285 | const struct nft_expr *expr, | |
286 | const struct nlattr * const tb[]) | |
c4ede3d3 | 287 | { |
fe92ca45 PM |
288 | struct nft_ct *priv = nft_expr_priv(expr); |
289 | int err; | |
290 | ||
291 | priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY])); | |
292 | switch (priv->key) { | |
e88e514e | 293 | #ifdef CONFIG_NF_CONNTRACK_MARK |
c4ede3d3 KE |
294 | case NFT_CT_MARK: |
295 | break; | |
e88e514e | 296 | #endif |
c4ede3d3 KE |
297 | default: |
298 | return -EOPNOTSUPP; | |
299 | } | |
300 | ||
fe92ca45 PM |
301 | priv->sreg = ntohl(nla_get_be32(tb[NFTA_CT_SREG])); |
302 | err = nft_validate_input_register(priv->sreg); | |
303 | if (err < 0) | |
304 | return err; | |
c4ede3d3 | 305 | |
9638f33e | 306 | err = nft_ct_l3proto_try_module_get(ctx->afi->family); |
96518518 PM |
307 | if (err < 0) |
308 | return err; | |
96518518 | 309 | |
96518518 | 310 | return 0; |
96518518 PM |
311 | } |
312 | ||
62472bce PM |
313 | static void nft_ct_destroy(const struct nft_ctx *ctx, |
314 | const struct nft_expr *expr) | |
96518518 | 315 | { |
d46f2cd2 | 316 | nft_ct_l3proto_module_put(ctx->afi->family); |
96518518 PM |
317 | } |
318 | ||
c4ede3d3 | 319 | static int nft_ct_get_dump(struct sk_buff *skb, const struct nft_expr *expr) |
96518518 PM |
320 | { |
321 | const struct nft_ct *priv = nft_expr_priv(expr); | |
322 | ||
323 | if (nla_put_be32(skb, NFTA_CT_DREG, htonl(priv->dreg))) | |
324 | goto nla_put_failure; | |
325 | if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key))) | |
326 | goto nla_put_failure; | |
2a53bfb3 AB |
327 | |
328 | switch (priv->key) { | |
329 | case NFT_CT_PROTOCOL: | |
330 | case NFT_CT_SRC: | |
331 | case NFT_CT_DST: | |
332 | case NFT_CT_PROTO_SRC: | |
333 | case NFT_CT_PROTO_DST: | |
334 | if (nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir)) | |
335 | goto nla_put_failure; | |
336 | default: | |
337 | break; | |
338 | } | |
339 | ||
96518518 PM |
340 | return 0; |
341 | ||
342 | nla_put_failure: | |
343 | return -1; | |
344 | } | |
345 | ||
c4ede3d3 KE |
346 | static int nft_ct_set_dump(struct sk_buff *skb, const struct nft_expr *expr) |
347 | { | |
348 | const struct nft_ct *priv = nft_expr_priv(expr); | |
349 | ||
350 | if (nla_put_be32(skb, NFTA_CT_SREG, htonl(priv->sreg))) | |
351 | goto nla_put_failure; | |
352 | if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key))) | |
353 | goto nla_put_failure; | |
354 | return 0; | |
355 | ||
356 | nla_put_failure: | |
357 | return -1; | |
358 | } | |
359 | ||
ef1f7df9 | 360 | static struct nft_expr_type nft_ct_type; |
c4ede3d3 | 361 | static const struct nft_expr_ops nft_ct_get_ops = { |
ef1f7df9 | 362 | .type = &nft_ct_type, |
96518518 | 363 | .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)), |
c4ede3d3 | 364 | .eval = nft_ct_get_eval, |
fe92ca45 | 365 | .init = nft_ct_get_init, |
96518518 | 366 | .destroy = nft_ct_destroy, |
c4ede3d3 | 367 | .dump = nft_ct_get_dump, |
ef1f7df9 PM |
368 | }; |
369 | ||
c4ede3d3 KE |
370 | static const struct nft_expr_ops nft_ct_set_ops = { |
371 | .type = &nft_ct_type, | |
372 | .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)), | |
373 | .eval = nft_ct_set_eval, | |
fe92ca45 | 374 | .init = nft_ct_set_init, |
c4ede3d3 KE |
375 | .destroy = nft_ct_destroy, |
376 | .dump = nft_ct_set_dump, | |
377 | }; | |
378 | ||
379 | static const struct nft_expr_ops * | |
380 | nft_ct_select_ops(const struct nft_ctx *ctx, | |
381 | const struct nlattr * const tb[]) | |
382 | { | |
383 | if (tb[NFTA_CT_KEY] == NULL) | |
384 | return ERR_PTR(-EINVAL); | |
385 | ||
386 | if (tb[NFTA_CT_DREG] && tb[NFTA_CT_SREG]) | |
387 | return ERR_PTR(-EINVAL); | |
388 | ||
389 | if (tb[NFTA_CT_DREG]) | |
390 | return &nft_ct_get_ops; | |
391 | ||
392 | if (tb[NFTA_CT_SREG]) | |
393 | return &nft_ct_set_ops; | |
394 | ||
395 | return ERR_PTR(-EINVAL); | |
396 | } | |
397 | ||
ef1f7df9 PM |
398 | static struct nft_expr_type nft_ct_type __read_mostly = { |
399 | .name = "ct", | |
c4ede3d3 | 400 | .select_ops = &nft_ct_select_ops, |
96518518 PM |
401 | .policy = nft_ct_policy, |
402 | .maxattr = NFTA_CT_MAX, | |
ef1f7df9 | 403 | .owner = THIS_MODULE, |
96518518 PM |
404 | }; |
405 | ||
406 | static int __init nft_ct_module_init(void) | |
407 | { | |
ef1f7df9 | 408 | return nft_register_expr(&nft_ct_type); |
96518518 PM |
409 | } |
410 | ||
411 | static void __exit nft_ct_module_exit(void) | |
412 | { | |
ef1f7df9 | 413 | nft_unregister_expr(&nft_ct_type); |
96518518 PM |
414 | } |
415 | ||
416 | module_init(nft_ct_module_init); | |
417 | module_exit(nft_ct_module_exit); | |
418 | ||
419 | MODULE_LICENSE("GPL"); | |
420 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
421 | MODULE_ALIAS_NFT_EXPR("ct"); |