Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
0c6965dd | 3 | * net/sched/act_ipt.c iptables target interface |
1da177e4 LT |
4 | * |
5 | *TODO: Add other tables. For now we only support the ipv4 table targets | |
6 | * | |
0dcffd09 | 7 | * Copyright: Jamal Hadi Salim (2002-13) |
1da177e4 LT |
8 | */ |
9 | ||
1da177e4 LT |
10 | #include <linux/types.h> |
11 | #include <linux/kernel.h> | |
1da177e4 | 12 | #include <linux/string.h> |
1da177e4 | 13 | #include <linux/errno.h> |
1da177e4 LT |
14 | #include <linux/skbuff.h> |
15 | #include <linux/rtnetlink.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/init.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
dc5fc579 | 19 | #include <net/netlink.h> |
1da177e4 LT |
20 | #include <net/pkt_sched.h> |
21 | #include <linux/tc_act/tc_ipt.h> | |
22 | #include <net/tc_act/tc_ipt.h> | |
871cf386 | 23 | #include <net/tc_wrapper.h> |
1da177e4 LT |
24 | |
25 | #include <linux/netfilter_ipv4/ip_tables.h> | |
26 | ||
1da177e4 | 27 | |
a85a970a | 28 | static struct tc_action_ops act_ipt_ops; |
a85a970a | 29 | static struct tc_action_ops act_xt_ops; |
ddf97ccd | 30 | |
ec0acb09 XL |
31 | static int ipt_init_target(struct net *net, struct xt_entry_target *t, |
32 | char *table, unsigned int hook) | |
1da177e4 | 33 | { |
af5d6dc2 | 34 | struct xt_tgchk_param par; |
e60a13e0 | 35 | struct xt_target *target; |
4f8a881a | 36 | struct ipt_entry e = {}; |
1da177e4 LT |
37 | int ret = 0; |
38 | ||
239a87c8 PM |
39 | target = xt_request_find_target(AF_INET, t->u.user.name, |
40 | t->u.user.revision); | |
d2a7b6ba JE |
41 | if (IS_ERR(target)) |
42 | return PTR_ERR(target); | |
1da177e4 | 43 | |
1da177e4 | 44 | t->u.kernel.target = target; |
96d97030 | 45 | memset(&par, 0, sizeof(par)); |
ec0acb09 | 46 | par.net = net; |
af5d6dc2 | 47 | par.table = table; |
4f8a881a | 48 | par.entryinfo = &e; |
af5d6dc2 JE |
49 | par.target = target; |
50 | par.targinfo = t->data; | |
51 | par.hook_mask = hook; | |
916a917d | 52 | par.family = NFPROTO_IPV4; |
1da177e4 | 53 | |
916a917d | 54 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false); |
367c6790 | 55 | if (ret < 0) { |
239a87c8 | 56 | module_put(t->u.kernel.target->me); |
18118cdb | 57 | return ret; |
239a87c8 | 58 | } |
367c6790 | 59 | return 0; |
1da177e4 LT |
60 | } |
61 | ||
981471bd | 62 | static void ipt_destroy_target(struct xt_entry_target *t, struct net *net) |
1da177e4 | 63 | { |
a2df1648 JE |
64 | struct xt_tgdtor_param par = { |
65 | .target = t->u.kernel.target, | |
66 | .targinfo = t->data, | |
44ef548f | 67 | .family = NFPROTO_IPV4, |
981471bd | 68 | .net = net, |
a2df1648 JE |
69 | }; |
70 | if (par.target->destroy != NULL) | |
71 | par.target->destroy(&par); | |
72 | module_put(par.target->me); | |
1da177e4 LT |
73 | } |
74 | ||
9a63b255 | 75 | static void tcf_ipt_release(struct tc_action *a) |
1da177e4 | 76 | { |
86062033 | 77 | struct tcf_ipt *ipt = to_ipt(a); |
1e46ef17 DC |
78 | |
79 | if (ipt->tcfi_t) { | |
981471bd | 80 | ipt_destroy_target(ipt->tcfi_t, a->idrinfo->net); |
1e46ef17 DC |
81 | kfree(ipt->tcfi_t); |
82 | } | |
a5b5c958 | 83 | kfree(ipt->tcfi_tname); |
1da177e4 LT |
84 | } |
85 | ||
53b2bf3f PM |
86 | static const struct nla_policy ipt_policy[TCA_IPT_MAX + 1] = { |
87 | [TCA_IPT_TABLE] = { .type = NLA_STRING, .len = IFNAMSIZ }, | |
88 | [TCA_IPT_HOOK] = { .type = NLA_U32 }, | |
89 | [TCA_IPT_INDEX] = { .type = NLA_U32 }, | |
87a2e70d | 90 | [TCA_IPT_TARG] = { .len = sizeof(struct xt_entry_target) }, |
53b2bf3f PM |
91 | }; |
92 | ||
ec0acb09 | 93 | static int __tcf_ipt_init(struct net *net, unsigned int id, struct nlattr *nla, |
a85a970a | 94 | struct nlattr *est, struct tc_action **a, |
695176bf | 95 | const struct tc_action_ops *ops, |
abbb0d33 | 96 | struct tcf_proto *tp, u32 flags) |
1da177e4 | 97 | { |
ec0acb09 | 98 | struct tc_action_net *tn = net_generic(net, id); |
695176bf | 99 | bool bind = flags & TCA_ACT_FLAGS_BIND; |
7ba699c6 | 100 | struct nlattr *tb[TCA_IPT_MAX + 1]; |
e9ce1cd3 | 101 | struct tcf_ipt *ipt; |
87a2e70d | 102 | struct xt_entry_target *td, *t; |
1da177e4 | 103 | char *tname; |
b2313077 WC |
104 | bool exists = false; |
105 | int ret = 0, err; | |
1da177e4 LT |
106 | u32 hook = 0; |
107 | u32 index = 0; | |
108 | ||
cee63723 | 109 | if (nla == NULL) |
1da177e4 LT |
110 | return -EINVAL; |
111 | ||
8cb08174 JB |
112 | err = nla_parse_nested_deprecated(tb, TCA_IPT_MAX, nla, ipt_policy, |
113 | NULL); | |
cee63723 PM |
114 | if (err < 0) |
115 | return err; | |
116 | ||
a57f19d3 JHS |
117 | if (tb[TCA_IPT_INDEX] != NULL) |
118 | index = nla_get_u32(tb[TCA_IPT_INDEX]); | |
119 | ||
0190c1d4 VB |
120 | err = tcf_idr_check_alloc(tn, &index, a, bind); |
121 | if (err < 0) | |
122 | return err; | |
123 | exists = err; | |
a57f19d3 JHS |
124 | if (exists && bind) |
125 | return 0; | |
126 | ||
127 | if (tb[TCA_IPT_HOOK] == NULL || tb[TCA_IPT_TARG] == NULL) { | |
128 | if (exists) | |
65a206c0 | 129 | tcf_idr_release(*a, bind); |
0190c1d4 VB |
130 | else |
131 | tcf_idr_cleanup(tn, index); | |
1da177e4 | 132 | return -EINVAL; |
a57f19d3 | 133 | } |
53b2bf3f | 134 | |
87a2e70d | 135 | td = (struct xt_entry_target *)nla_data(tb[TCA_IPT_TARG]); |
aeadd93f | 136 | if (nla_len(tb[TCA_IPT_TARG]) != td->u.target_size) { |
d15eccea | 137 | if (exists) |
65a206c0 | 138 | tcf_idr_release(*a, bind); |
0190c1d4 VB |
139 | else |
140 | tcf_idr_cleanup(tn, index); | |
1da177e4 | 141 | return -EINVAL; |
d15eccea | 142 | } |
1da177e4 | 143 | |
d15eccea | 144 | if (!exists) { |
65a206c0 | 145 | ret = tcf_idr_create(tn, index, est, a, ops, bind, |
40bd094d | 146 | false, flags); |
0190c1d4 VB |
147 | if (ret) { |
148 | tcf_idr_cleanup(tn, index); | |
86062033 | 149 | return ret; |
0190c1d4 | 150 | } |
1da177e4 LT |
151 | ret = ACT_P_CREATED; |
152 | } else { | |
1a29321e JHS |
153 | if (bind)/* dont override defaults */ |
154 | return 0; | |
1a29321e | 155 | |
695176bf | 156 | if (!(flags & TCA_ACT_FLAGS_REPLACE)) { |
4e8ddd7f | 157 | tcf_idr_release(*a, bind); |
1da177e4 | 158 | return -EEXIST; |
4e8ddd7f | 159 | } |
1da177e4 | 160 | } |
1587bac4 | 161 | hook = nla_get_u32(tb[TCA_IPT_HOOK]); |
1da177e4 LT |
162 | |
163 | err = -ENOMEM; | |
164 | tname = kmalloc(IFNAMSIZ, GFP_KERNEL); | |
e9ce1cd3 | 165 | if (unlikely(!tname)) |
1da177e4 | 166 | goto err1; |
7ba699c6 | 167 | if (tb[TCA_IPT_TABLE] == NULL || |
872f6903 | 168 | nla_strscpy(tname, tb[TCA_IPT_TABLE], IFNAMSIZ) >= IFNAMSIZ) |
1da177e4 LT |
169 | strcpy(tname, "mangle"); |
170 | ||
c7b1b249 | 171 | t = kmemdup(td, td->u.target_size, GFP_KERNEL); |
e9ce1cd3 | 172 | if (unlikely(!t)) |
1da177e4 | 173 | goto err2; |
1da177e4 | 174 | |
ec0acb09 | 175 | err = ipt_init_target(net, t, tname, hook); |
cc7ec456 | 176 | if (err < 0) |
1da177e4 LT |
177 | goto err3; |
178 | ||
a85a970a WC |
179 | ipt = to_ipt(*a); |
180 | ||
e9ce1cd3 | 181 | spin_lock_bh(&ipt->tcf_lock); |
1da177e4 | 182 | if (ret != ACT_P_CREATED) { |
981471bd | 183 | ipt_destroy_target(ipt->tcfi_t, net); |
e9ce1cd3 DM |
184 | kfree(ipt->tcfi_tname); |
185 | kfree(ipt->tcfi_t); | |
1da177e4 | 186 | } |
e9ce1cd3 DM |
187 | ipt->tcfi_tname = tname; |
188 | ipt->tcfi_t = t; | |
189 | ipt->tcfi_hook = hook; | |
190 | spin_unlock_bh(&ipt->tcf_lock); | |
1da177e4 LT |
191 | return ret; |
192 | ||
193 | err3: | |
194 | kfree(t); | |
195 | err2: | |
196 | kfree(tname); | |
197 | err1: | |
8f67c90e | 198 | tcf_idr_release(*a, bind); |
1da177e4 LT |
199 | return err; |
200 | } | |
201 | ||
ddf97ccd | 202 | static int tcf_ipt_init(struct net *net, struct nlattr *nla, |
695176bf CW |
203 | struct nlattr *est, struct tc_action **a, |
204 | struct tcf_proto *tp, | |
abbb0d33 | 205 | u32 flags, struct netlink_ext_ack *extack) |
ddf97ccd | 206 | { |
acd0a7ab ZS |
207 | return __tcf_ipt_init(net, act_ipt_ops.net_id, nla, est, |
208 | a, &act_ipt_ops, tp, flags); | |
ddf97ccd WC |
209 | } |
210 | ||
211 | static int tcf_xt_init(struct net *net, struct nlattr *nla, | |
695176bf CW |
212 | struct nlattr *est, struct tc_action **a, |
213 | struct tcf_proto *tp, | |
abbb0d33 | 214 | u32 flags, struct netlink_ext_ack *extack) |
ddf97ccd | 215 | { |
acd0a7ab ZS |
216 | return __tcf_ipt_init(net, act_xt_ops.net_id, nla, est, |
217 | a, &act_xt_ops, tp, flags); | |
ddf97ccd WC |
218 | } |
219 | ||
871cf386 PT |
220 | TC_INDIRECT_SCOPE int tcf_ipt_act(struct sk_buff *skb, |
221 | const struct tc_action *a, | |
222 | struct tcf_result *res) | |
1da177e4 LT |
223 | { |
224 | int ret = 0, result = 0; | |
a85a970a | 225 | struct tcf_ipt *ipt = to_ipt(a); |
4b560b44 | 226 | struct xt_action_param par; |
613dbd95 PNA |
227 | struct nf_hook_state state = { |
228 | .net = dev_net(skb->dev), | |
229 | .in = skb->dev, | |
230 | .hook = ipt->tcfi_hook, | |
231 | .pf = NFPROTO_IPV4, | |
232 | }; | |
1da177e4 | 233 | |
14bbd6a5 PS |
234 | if (skb_unclone(skb, GFP_ATOMIC)) |
235 | return TC_ACT_UNSPEC; | |
1da177e4 | 236 | |
e9ce1cd3 | 237 | spin_lock(&ipt->tcf_lock); |
1da177e4 | 238 | |
9c4a4e48 | 239 | tcf_lastuse_update(&ipt->tcf_tm); |
bfe0d029 | 240 | bstats_update(&ipt->tcf_bstats, skb); |
1da177e4 LT |
241 | |
242 | /* yes, we have to worry about both in and out dev | |
cc7ec456 ED |
243 | * worry later - danger - this API seems to have changed |
244 | * from earlier kernels | |
245 | */ | |
613dbd95 | 246 | par.state = &state; |
7eb35586 JE |
247 | par.target = ipt->tcfi_t->u.kernel.target; |
248 | par.targinfo = ipt->tcfi_t->data; | |
249 | ret = par.target->target(skb, &par); | |
250 | ||
1da177e4 LT |
251 | switch (ret) { |
252 | case NF_ACCEPT: | |
253 | result = TC_ACT_OK; | |
254 | break; | |
255 | case NF_DROP: | |
256 | result = TC_ACT_SHOT; | |
e9ce1cd3 | 257 | ipt->tcf_qstats.drops++; |
1da177e4 | 258 | break; |
243bf6e2 | 259 | case XT_CONTINUE: |
1da177e4 LT |
260 | result = TC_ACT_PIPE; |
261 | break; | |
262 | default: | |
e87cc472 JP |
263 | net_notice_ratelimited("tc filter: Bogus netfilter code %d assume ACCEPT\n", |
264 | ret); | |
95df1b16 | 265 | result = TC_ACT_OK; |
1da177e4 LT |
266 | break; |
267 | } | |
e9ce1cd3 | 268 | spin_unlock(&ipt->tcf_lock); |
1da177e4 LT |
269 | return result; |
270 | ||
271 | } | |
272 | ||
0b0f43fe JHS |
273 | static int tcf_ipt_dump(struct sk_buff *skb, struct tc_action *a, int bind, |
274 | int ref) | |
1da177e4 | 275 | { |
27a884dc | 276 | unsigned char *b = skb_tail_pointer(skb); |
a85a970a | 277 | struct tcf_ipt *ipt = to_ipt(a); |
87a2e70d | 278 | struct xt_entry_target *t; |
1da177e4 LT |
279 | struct tcf_t tm; |
280 | struct tc_cnt c; | |
1da177e4 LT |
281 | |
282 | /* for simple targets kernel size == user size | |
cc7ec456 ED |
283 | * user name = target name |
284 | * for foolproof you need to not assume this | |
285 | */ | |
1da177e4 | 286 | |
ff25276d | 287 | spin_lock_bh(&ipt->tcf_lock); |
c7b1b249 | 288 | t = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC); |
e9ce1cd3 | 289 | if (unlikely(!t)) |
7ba699c6 | 290 | goto nla_put_failure; |
1da177e4 | 291 | |
036bb443 VB |
292 | c.bindcnt = atomic_read(&ipt->tcf_bindcnt) - bind; |
293 | c.refcnt = refcount_read(&ipt->tcf_refcnt) - ref; | |
e9ce1cd3 DM |
294 | strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name); |
295 | ||
1b34ec43 DM |
296 | if (nla_put(skb, TCA_IPT_TARG, ipt->tcfi_t->u.user.target_size, t) || |
297 | nla_put_u32(skb, TCA_IPT_INDEX, ipt->tcf_index) || | |
298 | nla_put_u32(skb, TCA_IPT_HOOK, ipt->tcfi_hook) || | |
299 | nla_put(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c) || | |
300 | nla_put_string(skb, TCA_IPT_TABLE, ipt->tcfi_tname)) | |
301 | goto nla_put_failure; | |
48d8ee16 JHS |
302 | |
303 | tcf_tm_dump(&tm, &ipt->tcf_tm); | |
9854518e | 304 | if (nla_put_64bit(skb, TCA_IPT_TM, sizeof(tm), &tm, TCA_IPT_PAD)) |
1b34ec43 | 305 | goto nla_put_failure; |
48d8ee16 | 306 | |
ff25276d | 307 | spin_unlock_bh(&ipt->tcf_lock); |
1da177e4 LT |
308 | kfree(t); |
309 | return skb->len; | |
310 | ||
7ba699c6 | 311 | nla_put_failure: |
ff25276d | 312 | spin_unlock_bh(&ipt->tcf_lock); |
dc5fc579 | 313 | nlmsg_trim(skb, b); |
1da177e4 LT |
314 | kfree(t); |
315 | return -1; | |
316 | } | |
317 | ||
318 | static struct tc_action_ops act_ipt_ops = { | |
319 | .kind = "ipt", | |
eddd2cf1 | 320 | .id = TCA_ID_IPT, |
1da177e4 | 321 | .owner = THIS_MODULE, |
11b9695b | 322 | .act = tcf_ipt_act, |
1da177e4 | 323 | .dump = tcf_ipt_dump, |
86062033 | 324 | .cleanup = tcf_ipt_release, |
1da177e4 | 325 | .init = tcf_ipt_init, |
a85a970a | 326 | .size = sizeof(struct tcf_ipt), |
ddf97ccd WC |
327 | }; |
328 | ||
329 | static __net_init int ipt_init_net(struct net *net) | |
330 | { | |
acd0a7ab | 331 | struct tc_action_net *tn = net_generic(net, act_ipt_ops.net_id); |
ddf97ccd | 332 | |
981471bd | 333 | return tc_action_net_init(net, tn, &act_ipt_ops); |
ddf97ccd WC |
334 | } |
335 | ||
039af9c6 | 336 | static void __net_exit ipt_exit_net(struct list_head *net_list) |
ddf97ccd | 337 | { |
acd0a7ab | 338 | tc_action_net_exit(net_list, act_ipt_ops.net_id); |
ddf97ccd WC |
339 | } |
340 | ||
341 | static struct pernet_operations ipt_net_ops = { | |
342 | .init = ipt_init_net, | |
039af9c6 | 343 | .exit_batch = ipt_exit_net, |
acd0a7ab | 344 | .id = &act_ipt_ops.net_id, |
ddf97ccd | 345 | .size = sizeof(struct tc_action_net), |
1da177e4 LT |
346 | }; |
347 | ||
0dcffd09 JHS |
348 | static struct tc_action_ops act_xt_ops = { |
349 | .kind = "xt", | |
eddd2cf1 | 350 | .id = TCA_ID_XT, |
0dcffd09 | 351 | .owner = THIS_MODULE, |
11b9695b | 352 | .act = tcf_ipt_act, |
0dcffd09 | 353 | .dump = tcf_ipt_dump, |
86062033 | 354 | .cleanup = tcf_ipt_release, |
ddf97ccd | 355 | .init = tcf_xt_init, |
a85a970a | 356 | .size = sizeof(struct tcf_ipt), |
ddf97ccd WC |
357 | }; |
358 | ||
359 | static __net_init int xt_init_net(struct net *net) | |
360 | { | |
acd0a7ab | 361 | struct tc_action_net *tn = net_generic(net, act_xt_ops.net_id); |
ddf97ccd | 362 | |
981471bd | 363 | return tc_action_net_init(net, tn, &act_xt_ops); |
ddf97ccd WC |
364 | } |
365 | ||
039af9c6 | 366 | static void __net_exit xt_exit_net(struct list_head *net_list) |
ddf97ccd | 367 | { |
acd0a7ab | 368 | tc_action_net_exit(net_list, act_xt_ops.net_id); |
ddf97ccd WC |
369 | } |
370 | ||
371 | static struct pernet_operations xt_net_ops = { | |
372 | .init = xt_init_net, | |
039af9c6 | 373 | .exit_batch = xt_exit_net, |
acd0a7ab | 374 | .id = &act_xt_ops.net_id, |
ddf97ccd | 375 | .size = sizeof(struct tc_action_net), |
0dcffd09 JHS |
376 | }; |
377 | ||
378 | MODULE_AUTHOR("Jamal Hadi Salim(2002-13)"); | |
1da177e4 LT |
379 | MODULE_DESCRIPTION("Iptables target actions"); |
380 | MODULE_LICENSE("GPL"); | |
0dcffd09 | 381 | MODULE_ALIAS("act_xt"); |
1da177e4 | 382 | |
e9ce1cd3 | 383 | static int __init ipt_init_module(void) |
1da177e4 | 384 | { |
4f1e9d89 | 385 | int ret1, ret2; |
369ba567 | 386 | |
ddf97ccd | 387 | ret1 = tcf_register_action(&act_xt_ops, &xt_net_ops); |
0dcffd09 | 388 | if (ret1 < 0) |
ddf97ccd WC |
389 | pr_err("Failed to load xt action\n"); |
390 | ||
391 | ret2 = tcf_register_action(&act_ipt_ops, &ipt_net_ops); | |
0dcffd09 | 392 | if (ret2 < 0) |
ddf97ccd | 393 | pr_err("Failed to load ipt action\n"); |
0dcffd09 | 394 | |
369ba567 | 395 | if (ret1 < 0 && ret2 < 0) { |
0dcffd09 | 396 | return ret1; |
369ba567 | 397 | } else |
0dcffd09 | 398 | return 0; |
1da177e4 LT |
399 | } |
400 | ||
e9ce1cd3 | 401 | static void __exit ipt_cleanup_module(void) |
1da177e4 | 402 | { |
ddf97ccd WC |
403 | tcf_unregister_action(&act_ipt_ops, &ipt_net_ops); |
404 | tcf_unregister_action(&act_xt_ops, &xt_net_ops); | |
1da177e4 LT |
405 | } |
406 | ||
407 | module_init(ipt_init_module); | |
408 | module_exit(ipt_cleanup_module); |