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 | |
c7d03a00 | 31 | static unsigned int ipt_net_id; |
a85a970a | 32 | static struct tc_action_ops act_ipt_ops; |
ddf97ccd | 33 | |
c7d03a00 | 34 | static unsigned int xt_net_id; |
a85a970a | 35 | static struct tc_action_ops act_xt_ops; |
ddf97ccd | 36 | |
ec0acb09 XL |
37 | static int ipt_init_target(struct net *net, struct xt_entry_target *t, |
38 | char *table, unsigned int hook) | |
1da177e4 | 39 | { |
af5d6dc2 | 40 | struct xt_tgchk_param par; |
e60a13e0 | 41 | struct xt_target *target; |
4f8a881a | 42 | struct ipt_entry e = {}; |
1da177e4 LT |
43 | int ret = 0; |
44 | ||
239a87c8 PM |
45 | target = xt_request_find_target(AF_INET, t->u.user.name, |
46 | t->u.user.revision); | |
d2a7b6ba JE |
47 | if (IS_ERR(target)) |
48 | return PTR_ERR(target); | |
1da177e4 | 49 | |
1da177e4 | 50 | t->u.kernel.target = target; |
96d97030 | 51 | memset(&par, 0, sizeof(par)); |
ec0acb09 | 52 | par.net = net; |
af5d6dc2 | 53 | par.table = table; |
4f8a881a | 54 | par.entryinfo = &e; |
af5d6dc2 JE |
55 | par.target = target; |
56 | par.targinfo = t->data; | |
57 | par.hook_mask = hook; | |
916a917d | 58 | par.family = NFPROTO_IPV4; |
1da177e4 | 59 | |
916a917d | 60 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false); |
367c6790 | 61 | if (ret < 0) { |
239a87c8 | 62 | module_put(t->u.kernel.target->me); |
18118cdb | 63 | return ret; |
239a87c8 | 64 | } |
367c6790 | 65 | return 0; |
1da177e4 LT |
66 | } |
67 | ||
87a2e70d | 68 | static void ipt_destroy_target(struct xt_entry_target *t) |
1da177e4 | 69 | { |
a2df1648 JE |
70 | struct xt_tgdtor_param par = { |
71 | .target = t->u.kernel.target, | |
72 | .targinfo = t->data, | |
44ef548f | 73 | .family = NFPROTO_IPV4, |
a2df1648 JE |
74 | }; |
75 | if (par.target->destroy != NULL) | |
76 | par.target->destroy(&par); | |
77 | module_put(par.target->me); | |
1da177e4 LT |
78 | } |
79 | ||
9a63b255 | 80 | static void tcf_ipt_release(struct tc_action *a) |
1da177e4 | 81 | { |
86062033 | 82 | struct tcf_ipt *ipt = to_ipt(a); |
1e46ef17 DC |
83 | |
84 | if (ipt->tcfi_t) { | |
85 | ipt_destroy_target(ipt->tcfi_t); | |
86 | kfree(ipt->tcfi_t); | |
87 | } | |
a5b5c958 | 88 | kfree(ipt->tcfi_tname); |
1da177e4 LT |
89 | } |
90 | ||
53b2bf3f PM |
91 | static const struct nla_policy ipt_policy[TCA_IPT_MAX + 1] = { |
92 | [TCA_IPT_TABLE] = { .type = NLA_STRING, .len = IFNAMSIZ }, | |
93 | [TCA_IPT_HOOK] = { .type = NLA_U32 }, | |
94 | [TCA_IPT_INDEX] = { .type = NLA_U32 }, | |
87a2e70d | 95 | [TCA_IPT_TARG] = { .len = sizeof(struct xt_entry_target) }, |
53b2bf3f PM |
96 | }; |
97 | ||
ec0acb09 | 98 | static int __tcf_ipt_init(struct net *net, unsigned int id, struct nlattr *nla, |
a85a970a | 99 | struct nlattr *est, struct tc_action **a, |
85d0966f DC |
100 | const struct tc_action_ops *ops, int ovr, int bind, |
101 | struct tcf_proto *tp) | |
1da177e4 | 102 | { |
ec0acb09 | 103 | struct tc_action_net *tn = net_generic(net, id); |
7ba699c6 | 104 | struct nlattr *tb[TCA_IPT_MAX + 1]; |
e9ce1cd3 | 105 | struct tcf_ipt *ipt; |
87a2e70d | 106 | struct xt_entry_target *td, *t; |
1da177e4 | 107 | char *tname; |
b2313077 WC |
108 | bool exists = false; |
109 | int ret = 0, err; | |
1da177e4 LT |
110 | u32 hook = 0; |
111 | u32 index = 0; | |
112 | ||
cee63723 | 113 | if (nla == NULL) |
1da177e4 LT |
114 | return -EINVAL; |
115 | ||
fceb6435 | 116 | err = nla_parse_nested(tb, TCA_IPT_MAX, nla, ipt_policy, NULL); |
cee63723 PM |
117 | if (err < 0) |
118 | return err; | |
119 | ||
a57f19d3 JHS |
120 | if (tb[TCA_IPT_INDEX] != NULL) |
121 | index = nla_get_u32(tb[TCA_IPT_INDEX]); | |
122 | ||
0190c1d4 VB |
123 | err = tcf_idr_check_alloc(tn, &index, a, bind); |
124 | if (err < 0) | |
125 | return err; | |
126 | exists = err; | |
a57f19d3 JHS |
127 | if (exists && bind) |
128 | return 0; | |
129 | ||
130 | if (tb[TCA_IPT_HOOK] == NULL || tb[TCA_IPT_TARG] == NULL) { | |
131 | if (exists) | |
65a206c0 | 132 | tcf_idr_release(*a, bind); |
0190c1d4 VB |
133 | else |
134 | tcf_idr_cleanup(tn, index); | |
1da177e4 | 135 | return -EINVAL; |
a57f19d3 | 136 | } |
53b2bf3f | 137 | |
87a2e70d | 138 | td = (struct xt_entry_target *)nla_data(tb[TCA_IPT_TARG]); |
aeadd93f | 139 | if (nla_len(tb[TCA_IPT_TARG]) != td->u.target_size) { |
d15eccea | 140 | if (exists) |
65a206c0 | 141 | tcf_idr_release(*a, bind); |
0190c1d4 VB |
142 | else |
143 | tcf_idr_cleanup(tn, index); | |
1da177e4 | 144 | return -EINVAL; |
d15eccea | 145 | } |
1da177e4 | 146 | |
d15eccea | 147 | if (!exists) { |
65a206c0 CM |
148 | ret = tcf_idr_create(tn, index, est, a, ops, bind, |
149 | false); | |
0190c1d4 VB |
150 | if (ret) { |
151 | tcf_idr_cleanup(tn, index); | |
86062033 | 152 | return ret; |
0190c1d4 | 153 | } |
1da177e4 LT |
154 | ret = ACT_P_CREATED; |
155 | } else { | |
1a29321e JHS |
156 | if (bind)/* dont override defaults */ |
157 | return 0; | |
1a29321e | 158 | |
4e8ddd7f VB |
159 | if (!ovr) { |
160 | tcf_idr_release(*a, bind); | |
1da177e4 | 161 | return -EEXIST; |
4e8ddd7f | 162 | } |
1da177e4 | 163 | } |
1587bac4 | 164 | hook = nla_get_u32(tb[TCA_IPT_HOOK]); |
1da177e4 LT |
165 | |
166 | err = -ENOMEM; | |
167 | tname = kmalloc(IFNAMSIZ, GFP_KERNEL); | |
e9ce1cd3 | 168 | if (unlikely(!tname)) |
1da177e4 | 169 | goto err1; |
7ba699c6 PM |
170 | if (tb[TCA_IPT_TABLE] == NULL || |
171 | nla_strlcpy(tname, tb[TCA_IPT_TABLE], IFNAMSIZ) >= IFNAMSIZ) | |
1da177e4 LT |
172 | strcpy(tname, "mangle"); |
173 | ||
c7b1b249 | 174 | t = kmemdup(td, td->u.target_size, GFP_KERNEL); |
e9ce1cd3 | 175 | if (unlikely(!t)) |
1da177e4 | 176 | goto err2; |
1da177e4 | 177 | |
ec0acb09 | 178 | err = ipt_init_target(net, t, tname, hook); |
cc7ec456 | 179 | if (err < 0) |
1da177e4 LT |
180 | goto err3; |
181 | ||
a85a970a WC |
182 | ipt = to_ipt(*a); |
183 | ||
e9ce1cd3 | 184 | spin_lock_bh(&ipt->tcf_lock); |
1da177e4 | 185 | if (ret != ACT_P_CREATED) { |
e9ce1cd3 DM |
186 | ipt_destroy_target(ipt->tcfi_t); |
187 | kfree(ipt->tcfi_tname); | |
188 | kfree(ipt->tcfi_t); | |
1da177e4 | 189 | } |
e9ce1cd3 DM |
190 | ipt->tcfi_tname = tname; |
191 | ipt->tcfi_t = t; | |
192 | ipt->tcfi_hook = hook; | |
193 | spin_unlock_bh(&ipt->tcf_lock); | |
1da177e4 | 194 | if (ret == ACT_P_CREATED) |
65a206c0 | 195 | tcf_idr_insert(tn, *a); |
1da177e4 LT |
196 | return ret; |
197 | ||
198 | err3: | |
199 | kfree(t); | |
200 | err2: | |
201 | kfree(tname); | |
202 | err1: | |
8f67c90e | 203 | tcf_idr_release(*a, bind); |
1da177e4 LT |
204 | return err; |
205 | } | |
206 | ||
ddf97ccd | 207 | static int tcf_ipt_init(struct net *net, struct nlattr *nla, |
a85a970a | 208 | struct nlattr *est, struct tc_action **a, int ovr, |
85d0966f | 209 | int bind, bool rtnl_held, struct tcf_proto *tp, |
789871bb | 210 | struct netlink_ext_ack *extack) |
ddf97ccd | 211 | { |
ec0acb09 | 212 | return __tcf_ipt_init(net, ipt_net_id, nla, est, a, &act_ipt_ops, ovr, |
85d0966f | 213 | bind, tp); |
ddf97ccd WC |
214 | } |
215 | ||
216 | static int tcf_xt_init(struct net *net, struct nlattr *nla, | |
a85a970a | 217 | struct nlattr *est, struct tc_action **a, int ovr, |
85d0966f | 218 | int bind, bool unlocked, struct tcf_proto *tp, |
789871bb | 219 | struct netlink_ext_ack *extack) |
ddf97ccd | 220 | { |
ec0acb09 | 221 | return __tcf_ipt_init(net, xt_net_id, nla, est, a, &act_xt_ops, ovr, |
85d0966f | 222 | bind, tp); |
ddf97ccd WC |
223 | } |
224 | ||
11b9695b JHS |
225 | static int tcf_ipt_act(struct sk_buff *skb, const struct tc_action *a, |
226 | struct tcf_result *res) | |
1da177e4 LT |
227 | { |
228 | int ret = 0, result = 0; | |
a85a970a | 229 | struct tcf_ipt *ipt = to_ipt(a); |
4b560b44 | 230 | struct xt_action_param par; |
613dbd95 PNA |
231 | struct nf_hook_state state = { |
232 | .net = dev_net(skb->dev), | |
233 | .in = skb->dev, | |
234 | .hook = ipt->tcfi_hook, | |
235 | .pf = NFPROTO_IPV4, | |
236 | }; | |
1da177e4 | 237 | |
14bbd6a5 PS |
238 | if (skb_unclone(skb, GFP_ATOMIC)) |
239 | return TC_ACT_UNSPEC; | |
1da177e4 | 240 | |
e9ce1cd3 | 241 | spin_lock(&ipt->tcf_lock); |
1da177e4 | 242 | |
9c4a4e48 | 243 | tcf_lastuse_update(&ipt->tcf_tm); |
bfe0d029 | 244 | bstats_update(&ipt->tcf_bstats, skb); |
1da177e4 LT |
245 | |
246 | /* yes, we have to worry about both in and out dev | |
cc7ec456 ED |
247 | * worry later - danger - this API seems to have changed |
248 | * from earlier kernels | |
249 | */ | |
613dbd95 | 250 | par.state = &state; |
7eb35586 JE |
251 | par.target = ipt->tcfi_t->u.kernel.target; |
252 | par.targinfo = ipt->tcfi_t->data; | |
253 | ret = par.target->target(skb, &par); | |
254 | ||
1da177e4 LT |
255 | switch (ret) { |
256 | case NF_ACCEPT: | |
257 | result = TC_ACT_OK; | |
258 | break; | |
259 | case NF_DROP: | |
260 | result = TC_ACT_SHOT; | |
e9ce1cd3 | 261 | ipt->tcf_qstats.drops++; |
1da177e4 | 262 | break; |
243bf6e2 | 263 | case XT_CONTINUE: |
1da177e4 LT |
264 | result = TC_ACT_PIPE; |
265 | break; | |
266 | default: | |
e87cc472 JP |
267 | net_notice_ratelimited("tc filter: Bogus netfilter code %d assume ACCEPT\n", |
268 | ret); | |
95df1b16 | 269 | result = TC_ACT_OK; |
1da177e4 LT |
270 | break; |
271 | } | |
e9ce1cd3 | 272 | spin_unlock(&ipt->tcf_lock); |
1da177e4 LT |
273 | return result; |
274 | ||
275 | } | |
276 | ||
0b0f43fe JHS |
277 | static int tcf_ipt_dump(struct sk_buff *skb, struct tc_action *a, int bind, |
278 | int ref) | |
1da177e4 | 279 | { |
27a884dc | 280 | unsigned char *b = skb_tail_pointer(skb); |
a85a970a | 281 | struct tcf_ipt *ipt = to_ipt(a); |
87a2e70d | 282 | struct xt_entry_target *t; |
1da177e4 LT |
283 | struct tcf_t tm; |
284 | struct tc_cnt c; | |
1da177e4 LT |
285 | |
286 | /* for simple targets kernel size == user size | |
cc7ec456 ED |
287 | * user name = target name |
288 | * for foolproof you need to not assume this | |
289 | */ | |
1da177e4 | 290 | |
ff25276d | 291 | spin_lock_bh(&ipt->tcf_lock); |
c7b1b249 | 292 | t = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC); |
e9ce1cd3 | 293 | if (unlikely(!t)) |
7ba699c6 | 294 | goto nla_put_failure; |
1da177e4 | 295 | |
036bb443 VB |
296 | c.bindcnt = atomic_read(&ipt->tcf_bindcnt) - bind; |
297 | c.refcnt = refcount_read(&ipt->tcf_refcnt) - ref; | |
e9ce1cd3 DM |
298 | strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name); |
299 | ||
1b34ec43 DM |
300 | if (nla_put(skb, TCA_IPT_TARG, ipt->tcfi_t->u.user.target_size, t) || |
301 | nla_put_u32(skb, TCA_IPT_INDEX, ipt->tcf_index) || | |
302 | nla_put_u32(skb, TCA_IPT_HOOK, ipt->tcfi_hook) || | |
303 | nla_put(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c) || | |
304 | nla_put_string(skb, TCA_IPT_TABLE, ipt->tcfi_tname)) | |
305 | goto nla_put_failure; | |
48d8ee16 JHS |
306 | |
307 | tcf_tm_dump(&tm, &ipt->tcf_tm); | |
9854518e | 308 | if (nla_put_64bit(skb, TCA_IPT_TM, sizeof(tm), &tm, TCA_IPT_PAD)) |
1b34ec43 | 309 | goto nla_put_failure; |
48d8ee16 | 310 | |
ff25276d | 311 | spin_unlock_bh(&ipt->tcf_lock); |
1da177e4 LT |
312 | kfree(t); |
313 | return skb->len; | |
314 | ||
7ba699c6 | 315 | nla_put_failure: |
ff25276d | 316 | spin_unlock_bh(&ipt->tcf_lock); |
dc5fc579 | 317 | nlmsg_trim(skb, b); |
1da177e4 LT |
318 | kfree(t); |
319 | return -1; | |
320 | } | |
321 | ||
ddf97ccd WC |
322 | static int tcf_ipt_walker(struct net *net, struct sk_buff *skb, |
323 | struct netlink_callback *cb, int type, | |
41780105 AA |
324 | const struct tc_action_ops *ops, |
325 | struct netlink_ext_ack *extack) | |
ddf97ccd WC |
326 | { |
327 | struct tc_action_net *tn = net_generic(net, ipt_net_id); | |
328 | ||
b3620145 | 329 | return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
ddf97ccd WC |
330 | } |
331 | ||
f061b48c | 332 | static int tcf_ipt_search(struct net *net, struct tc_action **a, u32 index) |
ddf97ccd WC |
333 | { |
334 | struct tc_action_net *tn = net_generic(net, ipt_net_id); | |
335 | ||
65a206c0 | 336 | return tcf_idr_search(tn, a, index); |
ddf97ccd WC |
337 | } |
338 | ||
1da177e4 LT |
339 | static struct tc_action_ops act_ipt_ops = { |
340 | .kind = "ipt", | |
eddd2cf1 | 341 | .id = TCA_ID_IPT, |
1da177e4 | 342 | .owner = THIS_MODULE, |
11b9695b | 343 | .act = tcf_ipt_act, |
1da177e4 | 344 | .dump = tcf_ipt_dump, |
86062033 | 345 | .cleanup = tcf_ipt_release, |
1da177e4 | 346 | .init = tcf_ipt_init, |
ddf97ccd WC |
347 | .walk = tcf_ipt_walker, |
348 | .lookup = tcf_ipt_search, | |
a85a970a | 349 | .size = sizeof(struct tcf_ipt), |
ddf97ccd WC |
350 | }; |
351 | ||
352 | static __net_init int ipt_init_net(struct net *net) | |
353 | { | |
354 | struct tc_action_net *tn = net_generic(net, ipt_net_id); | |
355 | ||
c7e460ce | 356 | return tc_action_net_init(tn, &act_ipt_ops); |
ddf97ccd WC |
357 | } |
358 | ||
039af9c6 | 359 | static void __net_exit ipt_exit_net(struct list_head *net_list) |
ddf97ccd | 360 | { |
039af9c6 | 361 | tc_action_net_exit(net_list, ipt_net_id); |
ddf97ccd WC |
362 | } |
363 | ||
364 | static struct pernet_operations ipt_net_ops = { | |
365 | .init = ipt_init_net, | |
039af9c6 | 366 | .exit_batch = ipt_exit_net, |
ddf97ccd WC |
367 | .id = &ipt_net_id, |
368 | .size = sizeof(struct tc_action_net), | |
1da177e4 LT |
369 | }; |
370 | ||
ddf97ccd WC |
371 | static int tcf_xt_walker(struct net *net, struct sk_buff *skb, |
372 | struct netlink_callback *cb, int type, | |
41780105 AA |
373 | const struct tc_action_ops *ops, |
374 | struct netlink_ext_ack *extack) | |
ddf97ccd WC |
375 | { |
376 | struct tc_action_net *tn = net_generic(net, xt_net_id); | |
377 | ||
b3620145 | 378 | return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
ddf97ccd WC |
379 | } |
380 | ||
f061b48c | 381 | static int tcf_xt_search(struct net *net, struct tc_action **a, u32 index) |
ddf97ccd WC |
382 | { |
383 | struct tc_action_net *tn = net_generic(net, xt_net_id); | |
384 | ||
65a206c0 | 385 | return tcf_idr_search(tn, a, index); |
ddf97ccd WC |
386 | } |
387 | ||
0dcffd09 JHS |
388 | static struct tc_action_ops act_xt_ops = { |
389 | .kind = "xt", | |
eddd2cf1 | 390 | .id = TCA_ID_XT, |
0dcffd09 | 391 | .owner = THIS_MODULE, |
11b9695b | 392 | .act = tcf_ipt_act, |
0dcffd09 | 393 | .dump = tcf_ipt_dump, |
86062033 | 394 | .cleanup = tcf_ipt_release, |
ddf97ccd WC |
395 | .init = tcf_xt_init, |
396 | .walk = tcf_xt_walker, | |
397 | .lookup = tcf_xt_search, | |
a85a970a | 398 | .size = sizeof(struct tcf_ipt), |
ddf97ccd WC |
399 | }; |
400 | ||
401 | static __net_init int xt_init_net(struct net *net) | |
402 | { | |
403 | struct tc_action_net *tn = net_generic(net, xt_net_id); | |
404 | ||
c7e460ce | 405 | return tc_action_net_init(tn, &act_xt_ops); |
ddf97ccd WC |
406 | } |
407 | ||
039af9c6 | 408 | static void __net_exit xt_exit_net(struct list_head *net_list) |
ddf97ccd | 409 | { |
039af9c6 | 410 | tc_action_net_exit(net_list, xt_net_id); |
ddf97ccd WC |
411 | } |
412 | ||
413 | static struct pernet_operations xt_net_ops = { | |
414 | .init = xt_init_net, | |
039af9c6 | 415 | .exit_batch = xt_exit_net, |
ddf97ccd WC |
416 | .id = &xt_net_id, |
417 | .size = sizeof(struct tc_action_net), | |
0dcffd09 JHS |
418 | }; |
419 | ||
420 | MODULE_AUTHOR("Jamal Hadi Salim(2002-13)"); | |
1da177e4 LT |
421 | MODULE_DESCRIPTION("Iptables target actions"); |
422 | MODULE_LICENSE("GPL"); | |
0dcffd09 | 423 | MODULE_ALIAS("act_xt"); |
1da177e4 | 424 | |
e9ce1cd3 | 425 | static int __init ipt_init_module(void) |
1da177e4 | 426 | { |
4f1e9d89 | 427 | int ret1, ret2; |
369ba567 | 428 | |
ddf97ccd | 429 | ret1 = tcf_register_action(&act_xt_ops, &xt_net_ops); |
0dcffd09 | 430 | if (ret1 < 0) |
ddf97ccd WC |
431 | pr_err("Failed to load xt action\n"); |
432 | ||
433 | ret2 = tcf_register_action(&act_ipt_ops, &ipt_net_ops); | |
0dcffd09 | 434 | if (ret2 < 0) |
ddf97ccd | 435 | pr_err("Failed to load ipt action\n"); |
0dcffd09 | 436 | |
369ba567 | 437 | if (ret1 < 0 && ret2 < 0) { |
0dcffd09 | 438 | return ret1; |
369ba567 | 439 | } else |
0dcffd09 | 440 | return 0; |
1da177e4 LT |
441 | } |
442 | ||
e9ce1cd3 | 443 | static void __exit ipt_cleanup_module(void) |
1da177e4 | 444 | { |
ddf97ccd WC |
445 | tcf_unregister_action(&act_ipt_ops, &ipt_net_ops); |
446 | tcf_unregister_action(&act_xt_ops, &xt_net_ops); | |
1da177e4 LT |
447 | } |
448 | ||
449 | module_init(ipt_init_module); | |
450 | module_exit(ipt_cleanup_module); |