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1 | /* |
2 | * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> |
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> |
21 | #include <net/netfilter/nf_conntrack_ecache.h> |
22 | #include <net/netfilter/nf_conntrack_labels.h> |
23 | |
24 | struct nft_ct { |
25 | enum nft_ct_keys key:8; |
26 | enum ip_conntrack_dir dir:8; |
27 | union { |
28 | enum nft_registers dreg:8; |
29 | enum nft_registers sreg:8; |
30 | }; |
31 | }; |
32 | |
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) |
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; |
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 |
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 | |
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; |
156 | #ifdef CONFIG_NF_CONNTRACK_MARK |
157 | u32 value = data[priv->sreg].data[0]; |
158 | #endif |
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 | |
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 }, |
182 | [NFTA_CT_SREG] = { .type = NLA_U32 }, |
183 | }; |
184 | |
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 | |
218 | static int nft_ct_init_validate_get(const struct nft_expr *expr, |
219 | const struct nlattr * const tb[]) |
220 | { |
221 | struct nft_ct *priv = nft_expr_priv(expr); |
222 | |
223 | if (tb[NFTA_CT_DIRECTION] != NULL) { |
224 | priv->dir = nla_get_u8(tb[NFTA_CT_DIRECTION]); |
225 | switch (priv->dir) { |
226 | case IP_CT_DIR_ORIGINAL: |
227 | case IP_CT_DIR_REPLY: |
228 | break; |
229 | default: |
230 | return -EINVAL; |
231 | } |
232 | } |
233 | |
234 | switch (priv->key) { |
235 | case NFT_CT_STATE: |
236 | case NFT_CT_DIRECTION: |
237 | case NFT_CT_STATUS: |
238 | #ifdef CONFIG_NF_CONNTRACK_MARK |
239 | case NFT_CT_MARK: |
240 | #endif |
241 | #ifdef CONFIG_NF_CONNTRACK_SECMARK |
242 | case NFT_CT_SECMARK: |
243 | #endif |
244 | #ifdef CONFIG_NF_CONNTRACK_LABELS |
245 | case NFT_CT_LABELS: |
246 | #endif |
247 | case NFT_CT_EXPIRATION: |
248 | case NFT_CT_HELPER: |
249 | if (tb[NFTA_CT_DIRECTION] != NULL) |
250 | return -EINVAL; |
251 | break; |
252 | case NFT_CT_L3PROTOCOL: |
253 | case NFT_CT_PROTOCOL: |
254 | case NFT_CT_SRC: |
255 | case NFT_CT_DST: |
256 | case NFT_CT_PROTO_SRC: |
257 | case NFT_CT_PROTO_DST: |
258 | if (tb[NFTA_CT_DIRECTION] == NULL) |
259 | return -EINVAL; |
260 | break; |
261 | default: |
262 | return -EOPNOTSUPP; |
263 | } |
264 | |
265 | return 0; |
266 | } |
267 | |
268 | static int nft_ct_init_validate_set(uint32_t key) |
269 | { |
270 | switch (key) { |
271 | case NFT_CT_MARK: |
272 | break; |
273 | default: |
274 | return -EOPNOTSUPP; |
275 | } |
276 | |
277 | return 0; |
278 | } |
279 | |
280 | static int nft_ct_init(const struct nft_ctx *ctx, |
281 | const struct nft_expr *expr, |
282 | const struct nlattr * const tb[]) |
283 | { |
284 | struct nft_ct *priv = nft_expr_priv(expr); |
285 | int err; |
286 | |
287 | priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY])); |
288 | |
289 | if (tb[NFTA_CT_DREG]) { |
290 | err = nft_ct_init_validate_get(expr, tb); |
291 | if (err < 0) |
292 | return err; |
293 | |
294 | priv->dreg = ntohl(nla_get_be32(tb[NFTA_CT_DREG])); |
295 | err = nft_validate_output_register(priv->dreg); |
296 | if (err < 0) |
297 | return err; |
298 | |
299 | err = nft_validate_data_load(ctx, priv->dreg, NULL, |
300 | NFT_DATA_VALUE); |
301 | if (err < 0) |
302 | return err; |
303 | } else { |
304 | err = nft_ct_init_validate_set(priv->key); |
305 | if (err < 0) |
306 | return err; |
307 | |
308 | priv->sreg = ntohl(nla_get_be32(tb[NFTA_CT_SREG])); |
309 | err = nft_validate_input_register(priv->sreg); |
310 | if (err < 0) |
311 | return err; |
312 | } |
313 | |
314 | err = nft_ct_l3proto_try_module_get(ctx->afi->family); |
315 | if (err < 0) |
316 | return err; |
317 | |
318 | return 0; |
319 | } |
320 | |
321 | static void nft_ct_destroy(const struct nft_ctx *ctx, |
322 | const struct nft_expr *expr) |
323 | { |
324 | nft_ct_l3proto_module_put(ctx->afi->family); |
325 | } |
326 | |
327 | static int nft_ct_get_dump(struct sk_buff *skb, const struct nft_expr *expr) |
328 | { |
329 | const struct nft_ct *priv = nft_expr_priv(expr); |
330 | |
331 | if (nla_put_be32(skb, NFTA_CT_DREG, htonl(priv->dreg))) |
332 | goto nla_put_failure; |
333 | if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key))) |
334 | goto nla_put_failure; |
335 | |
336 | switch (priv->key) { |
337 | case NFT_CT_PROTOCOL: |
338 | case NFT_CT_SRC: |
339 | case NFT_CT_DST: |
340 | case NFT_CT_PROTO_SRC: |
341 | case NFT_CT_PROTO_DST: |
342 | if (nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir)) |
343 | goto nla_put_failure; |
344 | default: |
345 | break; |
346 | } |
347 | |
348 | return 0; |
349 | |
350 | nla_put_failure: |
351 | return -1; |
352 | } |
353 | |
354 | static int nft_ct_set_dump(struct sk_buff *skb, const struct nft_expr *expr) |
355 | { |
356 | const struct nft_ct *priv = nft_expr_priv(expr); |
357 | |
358 | if (nla_put_be32(skb, NFTA_CT_SREG, htonl(priv->sreg))) |
359 | goto nla_put_failure; |
360 | if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key))) |
361 | goto nla_put_failure; |
362 | return 0; |
363 | |
364 | nla_put_failure: |
365 | return -1; |
366 | } |
367 | |
368 | static struct nft_expr_type nft_ct_type; |
369 | static const struct nft_expr_ops nft_ct_get_ops = { |
370 | .type = &nft_ct_type, |
371 | .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)), |
372 | .eval = nft_ct_get_eval, |
373 | .init = nft_ct_init, |
374 | .destroy = nft_ct_destroy, |
375 | .dump = nft_ct_get_dump, |
376 | }; |
377 | |
378 | static const struct nft_expr_ops nft_ct_set_ops = { |
379 | .type = &nft_ct_type, |
380 | .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)), |
381 | .eval = nft_ct_set_eval, |
382 | .init = nft_ct_init, |
383 | .destroy = nft_ct_destroy, |
384 | .dump = nft_ct_set_dump, |
385 | }; |
386 | |
387 | static const struct nft_expr_ops * |
388 | nft_ct_select_ops(const struct nft_ctx *ctx, |
389 | const struct nlattr * const tb[]) |
390 | { |
391 | if (tb[NFTA_CT_KEY] == NULL) |
392 | return ERR_PTR(-EINVAL); |
393 | |
394 | if (tb[NFTA_CT_DREG] && tb[NFTA_CT_SREG]) |
395 | return ERR_PTR(-EINVAL); |
396 | |
397 | if (tb[NFTA_CT_DREG]) |
398 | return &nft_ct_get_ops; |
399 | |
400 | if (tb[NFTA_CT_SREG]) |
401 | return &nft_ct_set_ops; |
402 | |
403 | return ERR_PTR(-EINVAL); |
404 | } |
405 | |
406 | static struct nft_expr_type nft_ct_type __read_mostly = { |
407 | .name = "ct", |
408 | .select_ops = &nft_ct_select_ops, |
409 | .policy = nft_ct_policy, |
410 | .maxattr = NFTA_CT_MAX, |
411 | .owner = THIS_MODULE, |
412 | }; |
413 | |
414 | static int __init nft_ct_module_init(void) |
415 | { |
416 | return nft_register_expr(&nft_ct_type); |
417 | } |
418 | |
419 | static void __exit nft_ct_module_exit(void) |
420 | { |
421 | nft_unregister_expr(&nft_ct_type); |
422 | } |
423 | |
424 | module_init(nft_ct_module_init); |
425 | module_exit(nft_ct_module_exit); |
426 | |
427 | MODULE_LICENSE("GPL"); |
428 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
429 | MODULE_ALIAS_NFT_EXPR("ct"); |
430 |
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