Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
0c6965dd | 2 | * net/sched/act_ipt.c iptables target interface |
1da177e4 LT |
3 | * |
4 | *TODO: Add other tables. For now we only support the ipv4 table targets | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | * | |
0dcffd09 | 11 | * Copyright: Jamal Hadi Salim (2002-13) |
1da177e4 LT |
12 | */ |
13 | ||
1da177e4 LT |
14 | #include <linux/types.h> |
15 | #include <linux/kernel.h> | |
1da177e4 | 16 | #include <linux/string.h> |
1da177e4 | 17 | #include <linux/errno.h> |
1da177e4 LT |
18 | #include <linux/skbuff.h> |
19 | #include <linux/rtnetlink.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/init.h> | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
dc5fc579 | 23 | #include <net/netlink.h> |
1da177e4 LT |
24 | #include <net/pkt_sched.h> |
25 | #include <linux/tc_act/tc_ipt.h> | |
26 | #include <net/tc_act/tc_ipt.h> | |
27 | ||
28 | #include <linux/netfilter_ipv4/ip_tables.h> | |
29 | ||
1da177e4 | 30 | |
e9ce1cd3 | 31 | #define IPT_TAB_MASK 15 |
1da177e4 | 32 | |
ddf97ccd WC |
33 | static int ipt_net_id; |
34 | ||
35 | static int xt_net_id; | |
36 | ||
87a2e70d | 37 | static int ipt_init_target(struct xt_entry_target *t, char *table, unsigned int hook) |
1da177e4 | 38 | { |
af5d6dc2 | 39 | struct xt_tgchk_param par; |
e60a13e0 | 40 | struct xt_target *target; |
1da177e4 LT |
41 | int ret = 0; |
42 | ||
239a87c8 PM |
43 | target = xt_request_find_target(AF_INET, t->u.user.name, |
44 | t->u.user.revision); | |
d2a7b6ba JE |
45 | if (IS_ERR(target)) |
46 | return PTR_ERR(target); | |
1da177e4 | 47 | |
1da177e4 | 48 | t->u.kernel.target = target; |
af5d6dc2 JE |
49 | par.table = table; |
50 | par.entryinfo = NULL; | |
51 | par.target = target; | |
52 | par.targinfo = t->data; | |
53 | par.hook_mask = hook; | |
916a917d | 54 | par.family = NFPROTO_IPV4; |
1da177e4 | 55 | |
916a917d | 56 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false); |
367c6790 | 57 | if (ret < 0) { |
239a87c8 | 58 | module_put(t->u.kernel.target->me); |
18118cdb | 59 | return ret; |
239a87c8 | 60 | } |
367c6790 | 61 | return 0; |
1da177e4 LT |
62 | } |
63 | ||
87a2e70d | 64 | static void ipt_destroy_target(struct xt_entry_target *t) |
1da177e4 | 65 | { |
a2df1648 JE |
66 | struct xt_tgdtor_param par = { |
67 | .target = t->u.kernel.target, | |
68 | .targinfo = t->data, | |
44ef548f | 69 | .family = NFPROTO_IPV4, |
a2df1648 JE |
70 | }; |
71 | if (par.target->destroy != NULL) | |
72 | par.target->destroy(&par); | |
73 | module_put(par.target->me); | |
1da177e4 LT |
74 | } |
75 | ||
a5b5c958 | 76 | static void tcf_ipt_release(struct tc_action *a, int bind) |
1da177e4 | 77 | { |
86062033 | 78 | struct tcf_ipt *ipt = to_ipt(a); |
a5b5c958 WC |
79 | ipt_destroy_target(ipt->tcfi_t); |
80 | kfree(ipt->tcfi_tname); | |
81 | kfree(ipt->tcfi_t); | |
1da177e4 LT |
82 | } |
83 | ||
53b2bf3f PM |
84 | static const struct nla_policy ipt_policy[TCA_IPT_MAX + 1] = { |
85 | [TCA_IPT_TABLE] = { .type = NLA_STRING, .len = IFNAMSIZ }, | |
86 | [TCA_IPT_HOOK] = { .type = NLA_U32 }, | |
87 | [TCA_IPT_INDEX] = { .type = NLA_U32 }, | |
87a2e70d | 88 | [TCA_IPT_TARG] = { .len = sizeof(struct xt_entry_target) }, |
53b2bf3f PM |
89 | }; |
90 | ||
ddf97ccd WC |
91 | static int __tcf_ipt_init(struct tc_action_net *tn, struct nlattr *nla, |
92 | struct nlattr *est, struct tc_action *a, int ovr, | |
93 | int bind) | |
1da177e4 | 94 | { |
7ba699c6 | 95 | struct nlattr *tb[TCA_IPT_MAX + 1]; |
e9ce1cd3 | 96 | struct tcf_ipt *ipt; |
87a2e70d | 97 | struct xt_entry_target *td, *t; |
1da177e4 | 98 | char *tname; |
a57f19d3 | 99 | int ret = 0, err, exists = 0; |
1da177e4 LT |
100 | u32 hook = 0; |
101 | u32 index = 0; | |
102 | ||
cee63723 | 103 | if (nla == NULL) |
1da177e4 LT |
104 | return -EINVAL; |
105 | ||
53b2bf3f | 106 | err = nla_parse_nested(tb, TCA_IPT_MAX, nla, ipt_policy); |
cee63723 PM |
107 | if (err < 0) |
108 | return err; | |
109 | ||
a57f19d3 JHS |
110 | if (tb[TCA_IPT_INDEX] != NULL) |
111 | index = nla_get_u32(tb[TCA_IPT_INDEX]); | |
112 | ||
113 | exists = tcf_hash_check(tn, index, a, bind); | |
114 | if (exists && bind) | |
115 | return 0; | |
116 | ||
117 | if (tb[TCA_IPT_HOOK] == NULL || tb[TCA_IPT_TARG] == NULL) { | |
118 | if (exists) | |
119 | tcf_hash_release(a, bind); | |
1da177e4 | 120 | return -EINVAL; |
a57f19d3 | 121 | } |
53b2bf3f | 122 | |
87a2e70d | 123 | td = (struct xt_entry_target *)nla_data(tb[TCA_IPT_TARG]); |
7ba699c6 | 124 | if (nla_len(tb[TCA_IPT_TARG]) < td->u.target_size) |
1da177e4 LT |
125 | return -EINVAL; |
126 | ||
ddf97ccd WC |
127 | if (!tcf_hash_check(tn, index, a, bind)) { |
128 | ret = tcf_hash_create(tn, index, est, a, sizeof(*ipt), bind, | |
129 | false); | |
86062033 WC |
130 | if (ret) |
131 | return ret; | |
1da177e4 LT |
132 | ret = ACT_P_CREATED; |
133 | } else { | |
1a29321e JHS |
134 | if (bind)/* dont override defaults */ |
135 | return 0; | |
a5b5c958 | 136 | tcf_hash_release(a, bind); |
1a29321e JHS |
137 | |
138 | if (!ovr) | |
1da177e4 | 139 | return -EEXIST; |
1da177e4 | 140 | } |
86062033 | 141 | ipt = to_ipt(a); |
1da177e4 | 142 | |
1587bac4 | 143 | hook = nla_get_u32(tb[TCA_IPT_HOOK]); |
1da177e4 LT |
144 | |
145 | err = -ENOMEM; | |
146 | tname = kmalloc(IFNAMSIZ, GFP_KERNEL); | |
e9ce1cd3 | 147 | if (unlikely(!tname)) |
1da177e4 | 148 | goto err1; |
7ba699c6 PM |
149 | if (tb[TCA_IPT_TABLE] == NULL || |
150 | nla_strlcpy(tname, tb[TCA_IPT_TABLE], IFNAMSIZ) >= IFNAMSIZ) | |
1da177e4 LT |
151 | strcpy(tname, "mangle"); |
152 | ||
c7b1b249 | 153 | t = kmemdup(td, td->u.target_size, GFP_KERNEL); |
e9ce1cd3 | 154 | if (unlikely(!t)) |
1da177e4 | 155 | goto err2; |
1da177e4 | 156 | |
cc7ec456 ED |
157 | err = ipt_init_target(t, tname, hook); |
158 | if (err < 0) | |
1da177e4 LT |
159 | goto err3; |
160 | ||
e9ce1cd3 | 161 | spin_lock_bh(&ipt->tcf_lock); |
1da177e4 | 162 | if (ret != ACT_P_CREATED) { |
e9ce1cd3 DM |
163 | ipt_destroy_target(ipt->tcfi_t); |
164 | kfree(ipt->tcfi_tname); | |
165 | kfree(ipt->tcfi_t); | |
1da177e4 | 166 | } |
e9ce1cd3 DM |
167 | ipt->tcfi_tname = tname; |
168 | ipt->tcfi_t = t; | |
169 | ipt->tcfi_hook = hook; | |
170 | spin_unlock_bh(&ipt->tcf_lock); | |
1da177e4 | 171 | if (ret == ACT_P_CREATED) |
ddf97ccd | 172 | tcf_hash_insert(tn, a); |
1da177e4 LT |
173 | return ret; |
174 | ||
175 | err3: | |
176 | kfree(t); | |
177 | err2: | |
178 | kfree(tname); | |
179 | err1: | |
86062033 WC |
180 | if (ret == ACT_P_CREATED) |
181 | tcf_hash_cleanup(a, est); | |
1da177e4 LT |
182 | return err; |
183 | } | |
184 | ||
ddf97ccd WC |
185 | static int tcf_ipt_init(struct net *net, struct nlattr *nla, |
186 | struct nlattr *est, struct tc_action *a, int ovr, | |
187 | int bind) | |
188 | { | |
189 | struct tc_action_net *tn = net_generic(net, ipt_net_id); | |
190 | ||
191 | return __tcf_ipt_init(tn, nla, est, a, ovr, bind); | |
192 | } | |
193 | ||
194 | static int tcf_xt_init(struct net *net, struct nlattr *nla, | |
195 | struct nlattr *est, struct tc_action *a, int ovr, | |
196 | int bind) | |
197 | { | |
198 | struct tc_action_net *tn = net_generic(net, xt_net_id); | |
199 | ||
200 | return __tcf_ipt_init(tn, nla, est, a, ovr, bind); | |
201 | } | |
202 | ||
dc7f9f6e | 203 | static int tcf_ipt(struct sk_buff *skb, const struct tc_action *a, |
e9ce1cd3 | 204 | struct tcf_result *res) |
1da177e4 LT |
205 | { |
206 | int ret = 0, result = 0; | |
e9ce1cd3 | 207 | struct tcf_ipt *ipt = a->priv; |
4b560b44 | 208 | struct xt_action_param par; |
1da177e4 | 209 | |
14bbd6a5 PS |
210 | if (skb_unclone(skb, GFP_ATOMIC)) |
211 | return TC_ACT_UNSPEC; | |
1da177e4 | 212 | |
e9ce1cd3 | 213 | spin_lock(&ipt->tcf_lock); |
1da177e4 | 214 | |
e9ce1cd3 | 215 | ipt->tcf_tm.lastuse = jiffies; |
bfe0d029 | 216 | bstats_update(&ipt->tcf_bstats, skb); |
1da177e4 LT |
217 | |
218 | /* yes, we have to worry about both in and out dev | |
cc7ec456 ED |
219 | * worry later - danger - this API seems to have changed |
220 | * from earlier kernels | |
221 | */ | |
156c196f | 222 | par.net = dev_net(skb->dev); |
7eb35586 JE |
223 | par.in = skb->dev; |
224 | par.out = NULL; | |
225 | par.hooknum = ipt->tcfi_hook; | |
226 | par.target = ipt->tcfi_t->u.kernel.target; | |
227 | par.targinfo = ipt->tcfi_t->data; | |
44ef548f | 228 | par.family = NFPROTO_IPV4; |
7eb35586 JE |
229 | ret = par.target->target(skb, &par); |
230 | ||
1da177e4 LT |
231 | switch (ret) { |
232 | case NF_ACCEPT: | |
233 | result = TC_ACT_OK; | |
234 | break; | |
235 | case NF_DROP: | |
236 | result = TC_ACT_SHOT; | |
e9ce1cd3 | 237 | ipt->tcf_qstats.drops++; |
1da177e4 | 238 | break; |
243bf6e2 | 239 | case XT_CONTINUE: |
1da177e4 LT |
240 | result = TC_ACT_PIPE; |
241 | break; | |
242 | default: | |
e87cc472 JP |
243 | net_notice_ratelimited("tc filter: Bogus netfilter code %d assume ACCEPT\n", |
244 | ret); | |
1da177e4 LT |
245 | result = TC_POLICE_OK; |
246 | break; | |
247 | } | |
e9ce1cd3 | 248 | spin_unlock(&ipt->tcf_lock); |
1da177e4 LT |
249 | return result; |
250 | ||
251 | } | |
252 | ||
e9ce1cd3 | 253 | static int tcf_ipt_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref) |
1da177e4 | 254 | { |
27a884dc | 255 | unsigned char *b = skb_tail_pointer(skb); |
e9ce1cd3 | 256 | struct tcf_ipt *ipt = a->priv; |
87a2e70d | 257 | struct xt_entry_target *t; |
1da177e4 LT |
258 | struct tcf_t tm; |
259 | struct tc_cnt c; | |
1da177e4 LT |
260 | |
261 | /* for simple targets kernel size == user size | |
cc7ec456 ED |
262 | * user name = target name |
263 | * for foolproof you need to not assume this | |
264 | */ | |
1da177e4 | 265 | |
c7b1b249 | 266 | t = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC); |
e9ce1cd3 | 267 | if (unlikely(!t)) |
7ba699c6 | 268 | goto nla_put_failure; |
1da177e4 | 269 | |
e9ce1cd3 DM |
270 | c.bindcnt = ipt->tcf_bindcnt - bind; |
271 | c.refcnt = ipt->tcf_refcnt - ref; | |
e9ce1cd3 DM |
272 | strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name); |
273 | ||
1b34ec43 DM |
274 | if (nla_put(skb, TCA_IPT_TARG, ipt->tcfi_t->u.user.target_size, t) || |
275 | nla_put_u32(skb, TCA_IPT_INDEX, ipt->tcf_index) || | |
276 | nla_put_u32(skb, TCA_IPT_HOOK, ipt->tcfi_hook) || | |
277 | nla_put(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c) || | |
278 | nla_put_string(skb, TCA_IPT_TABLE, ipt->tcfi_tname)) | |
279 | goto nla_put_failure; | |
e9ce1cd3 DM |
280 | tm.install = jiffies_to_clock_t(jiffies - ipt->tcf_tm.install); |
281 | tm.lastuse = jiffies_to_clock_t(jiffies - ipt->tcf_tm.lastuse); | |
282 | tm.expires = jiffies_to_clock_t(ipt->tcf_tm.expires); | |
9854518e | 283 | if (nla_put_64bit(skb, TCA_IPT_TM, sizeof(tm), &tm, TCA_IPT_PAD)) |
1b34ec43 | 284 | goto nla_put_failure; |
1da177e4 LT |
285 | kfree(t); |
286 | return skb->len; | |
287 | ||
7ba699c6 | 288 | nla_put_failure: |
dc5fc579 | 289 | nlmsg_trim(skb, b); |
1da177e4 LT |
290 | kfree(t); |
291 | return -1; | |
292 | } | |
293 | ||
ddf97ccd WC |
294 | static int tcf_ipt_walker(struct net *net, struct sk_buff *skb, |
295 | struct netlink_callback *cb, int type, | |
296 | struct tc_action *a) | |
297 | { | |
298 | struct tc_action_net *tn = net_generic(net, ipt_net_id); | |
299 | ||
300 | return tcf_generic_walker(tn, skb, cb, type, a); | |
301 | } | |
302 | ||
303 | static int tcf_ipt_search(struct net *net, struct tc_action *a, u32 index) | |
304 | { | |
305 | struct tc_action_net *tn = net_generic(net, ipt_net_id); | |
306 | ||
307 | return tcf_hash_search(tn, a, index); | |
308 | } | |
309 | ||
1da177e4 LT |
310 | static struct tc_action_ops act_ipt_ops = { |
311 | .kind = "ipt", | |
312 | .type = TCA_ACT_IPT, | |
1da177e4 LT |
313 | .owner = THIS_MODULE, |
314 | .act = tcf_ipt, | |
315 | .dump = tcf_ipt_dump, | |
86062033 | 316 | .cleanup = tcf_ipt_release, |
1da177e4 | 317 | .init = tcf_ipt_init, |
ddf97ccd WC |
318 | .walk = tcf_ipt_walker, |
319 | .lookup = tcf_ipt_search, | |
320 | }; | |
321 | ||
322 | static __net_init int ipt_init_net(struct net *net) | |
323 | { | |
324 | struct tc_action_net *tn = net_generic(net, ipt_net_id); | |
325 | ||
326 | return tc_action_net_init(tn, &act_ipt_ops, IPT_TAB_MASK); | |
327 | } | |
328 | ||
329 | static void __net_exit ipt_exit_net(struct net *net) | |
330 | { | |
331 | struct tc_action_net *tn = net_generic(net, ipt_net_id); | |
332 | ||
333 | tc_action_net_exit(tn); | |
334 | } | |
335 | ||
336 | static struct pernet_operations ipt_net_ops = { | |
337 | .init = ipt_init_net, | |
338 | .exit = ipt_exit_net, | |
339 | .id = &ipt_net_id, | |
340 | .size = sizeof(struct tc_action_net), | |
1da177e4 LT |
341 | }; |
342 | ||
ddf97ccd WC |
343 | static int tcf_xt_walker(struct net *net, struct sk_buff *skb, |
344 | struct netlink_callback *cb, int type, | |
345 | struct tc_action *a) | |
346 | { | |
347 | struct tc_action_net *tn = net_generic(net, xt_net_id); | |
348 | ||
349 | return tcf_generic_walker(tn, skb, cb, type, a); | |
350 | } | |
351 | ||
352 | static int tcf_xt_search(struct net *net, struct tc_action *a, u32 index) | |
353 | { | |
354 | struct tc_action_net *tn = net_generic(net, xt_net_id); | |
355 | ||
356 | return tcf_hash_search(tn, a, index); | |
357 | } | |
358 | ||
0dcffd09 JHS |
359 | static struct tc_action_ops act_xt_ops = { |
360 | .kind = "xt", | |
6c80563c | 361 | .type = TCA_ACT_XT, |
0dcffd09 JHS |
362 | .owner = THIS_MODULE, |
363 | .act = tcf_ipt, | |
364 | .dump = tcf_ipt_dump, | |
86062033 | 365 | .cleanup = tcf_ipt_release, |
ddf97ccd WC |
366 | .init = tcf_xt_init, |
367 | .walk = tcf_xt_walker, | |
368 | .lookup = tcf_xt_search, | |
369 | }; | |
370 | ||
371 | static __net_init int xt_init_net(struct net *net) | |
372 | { | |
373 | struct tc_action_net *tn = net_generic(net, xt_net_id); | |
374 | ||
375 | return tc_action_net_init(tn, &act_xt_ops, IPT_TAB_MASK); | |
376 | } | |
377 | ||
378 | static void __net_exit xt_exit_net(struct net *net) | |
379 | { | |
380 | struct tc_action_net *tn = net_generic(net, xt_net_id); | |
381 | ||
382 | tc_action_net_exit(tn); | |
383 | } | |
384 | ||
385 | static struct pernet_operations xt_net_ops = { | |
386 | .init = xt_init_net, | |
387 | .exit = xt_exit_net, | |
388 | .id = &xt_net_id, | |
389 | .size = sizeof(struct tc_action_net), | |
0dcffd09 JHS |
390 | }; |
391 | ||
392 | MODULE_AUTHOR("Jamal Hadi Salim(2002-13)"); | |
1da177e4 LT |
393 | MODULE_DESCRIPTION("Iptables target actions"); |
394 | MODULE_LICENSE("GPL"); | |
0dcffd09 | 395 | MODULE_ALIAS("act_xt"); |
1da177e4 | 396 | |
e9ce1cd3 | 397 | static int __init ipt_init_module(void) |
1da177e4 | 398 | { |
4f1e9d89 | 399 | int ret1, ret2; |
369ba567 | 400 | |
ddf97ccd | 401 | ret1 = tcf_register_action(&act_xt_ops, &xt_net_ops); |
0dcffd09 | 402 | if (ret1 < 0) |
ddf97ccd WC |
403 | pr_err("Failed to load xt action\n"); |
404 | ||
405 | ret2 = tcf_register_action(&act_ipt_ops, &ipt_net_ops); | |
0dcffd09 | 406 | if (ret2 < 0) |
ddf97ccd | 407 | pr_err("Failed to load ipt action\n"); |
0dcffd09 | 408 | |
369ba567 | 409 | if (ret1 < 0 && ret2 < 0) { |
0dcffd09 | 410 | return ret1; |
369ba567 | 411 | } else |
0dcffd09 | 412 | return 0; |
1da177e4 LT |
413 | } |
414 | ||
e9ce1cd3 | 415 | static void __exit ipt_cleanup_module(void) |
1da177e4 | 416 | { |
ddf97ccd WC |
417 | tcf_unregister_action(&act_ipt_ops, &ipt_net_ops); |
418 | tcf_unregister_action(&act_xt_ops, &xt_net_ops); | |
1da177e4 LT |
419 | } |
420 | ||
421 | module_init(ipt_init_module); | |
422 | module_exit(ipt_cleanup_module); |