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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> | |
23 | ||
24 | #include <linux/netfilter_ipv4/ip_tables.h> | |
25 | ||
1da177e4 | 26 | |
c7d03a00 | 27 | static unsigned int ipt_net_id; |
a85a970a | 28 | static struct tc_action_ops act_ipt_ops; |
ddf97ccd | 29 | |
c7d03a00 | 30 | static unsigned int xt_net_id; |
a85a970a | 31 | static struct tc_action_ops act_xt_ops; |
ddf97ccd | 32 | |
ec0acb09 XL |
33 | static int ipt_init_target(struct net *net, struct xt_entry_target *t, |
34 | char *table, unsigned int hook) | |
1da177e4 | 35 | { |
af5d6dc2 | 36 | struct xt_tgchk_param par; |
e60a13e0 | 37 | struct xt_target *target; |
4f8a881a | 38 | struct ipt_entry e = {}; |
1da177e4 LT |
39 | int ret = 0; |
40 | ||
239a87c8 PM |
41 | target = xt_request_find_target(AF_INET, t->u.user.name, |
42 | t->u.user.revision); | |
d2a7b6ba JE |
43 | if (IS_ERR(target)) |
44 | return PTR_ERR(target); | |
1da177e4 | 45 | |
1da177e4 | 46 | t->u.kernel.target = target; |
96d97030 | 47 | memset(&par, 0, sizeof(par)); |
ec0acb09 | 48 | par.net = net; |
af5d6dc2 | 49 | par.table = table; |
4f8a881a | 50 | par.entryinfo = &e; |
af5d6dc2 JE |
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 | ||
9a63b255 | 76 | static void tcf_ipt_release(struct tc_action *a) |
1da177e4 | 77 | { |
86062033 | 78 | struct tcf_ipt *ipt = to_ipt(a); |
1e46ef17 DC |
79 | |
80 | if (ipt->tcfi_t) { | |
81 | ipt_destroy_target(ipt->tcfi_t); | |
82 | kfree(ipt->tcfi_t); | |
83 | } | |
a5b5c958 | 84 | kfree(ipt->tcfi_tname); |
1da177e4 LT |
85 | } |
86 | ||
53b2bf3f PM |
87 | static const struct nla_policy ipt_policy[TCA_IPT_MAX + 1] = { |
88 | [TCA_IPT_TABLE] = { .type = NLA_STRING, .len = IFNAMSIZ }, | |
89 | [TCA_IPT_HOOK] = { .type = NLA_U32 }, | |
90 | [TCA_IPT_INDEX] = { .type = NLA_U32 }, | |
87a2e70d | 91 | [TCA_IPT_TARG] = { .len = sizeof(struct xt_entry_target) }, |
53b2bf3f PM |
92 | }; |
93 | ||
ec0acb09 | 94 | static int __tcf_ipt_init(struct net *net, unsigned int id, struct nlattr *nla, |
a85a970a | 95 | struct nlattr *est, struct tc_action **a, |
85d0966f DC |
96 | const struct tc_action_ops *ops, int ovr, int bind, |
97 | struct tcf_proto *tp) | |
1da177e4 | 98 | { |
ec0acb09 | 99 | struct tc_action_net *tn = net_generic(net, id); |
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 CM |
145 | ret = tcf_idr_create(tn, index, est, a, ops, bind, |
146 | false); | |
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 | |
4e8ddd7f VB |
156 | if (!ovr) { |
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 PM |
167 | if (tb[TCA_IPT_TABLE] == NULL || |
168 | nla_strlcpy(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) { |
e9ce1cd3 DM |
183 | ipt_destroy_target(ipt->tcfi_t); |
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 | 191 | if (ret == ACT_P_CREATED) |
65a206c0 | 192 | tcf_idr_insert(tn, *a); |
1da177e4 LT |
193 | return ret; |
194 | ||
195 | err3: | |
196 | kfree(t); | |
197 | err2: | |
198 | kfree(tname); | |
199 | err1: | |
8f67c90e | 200 | tcf_idr_release(*a, bind); |
1da177e4 LT |
201 | return err; |
202 | } | |
203 | ||
ddf97ccd | 204 | static int tcf_ipt_init(struct net *net, struct nlattr *nla, |
a85a970a | 205 | struct nlattr *est, struct tc_action **a, int ovr, |
85d0966f | 206 | int bind, bool rtnl_held, struct tcf_proto *tp, |
789871bb | 207 | struct netlink_ext_ack *extack) |
ddf97ccd | 208 | { |
ec0acb09 | 209 | return __tcf_ipt_init(net, ipt_net_id, nla, est, a, &act_ipt_ops, ovr, |
85d0966f | 210 | bind, tp); |
ddf97ccd WC |
211 | } |
212 | ||
213 | static int tcf_xt_init(struct net *net, struct nlattr *nla, | |
a85a970a | 214 | struct nlattr *est, struct tc_action **a, int ovr, |
85d0966f | 215 | int bind, bool unlocked, struct tcf_proto *tp, |
789871bb | 216 | struct netlink_ext_ack *extack) |
ddf97ccd | 217 | { |
ec0acb09 | 218 | return __tcf_ipt_init(net, xt_net_id, nla, est, a, &act_xt_ops, ovr, |
85d0966f | 219 | bind, tp); |
ddf97ccd WC |
220 | } |
221 | ||
11b9695b JHS |
222 | static int tcf_ipt_act(struct sk_buff *skb, const struct tc_action *a, |
223 | struct tcf_result *res) | |
1da177e4 LT |
224 | { |
225 | int ret = 0, result = 0; | |
a85a970a | 226 | struct tcf_ipt *ipt = to_ipt(a); |
4b560b44 | 227 | struct xt_action_param par; |
613dbd95 PNA |
228 | struct nf_hook_state state = { |
229 | .net = dev_net(skb->dev), | |
230 | .in = skb->dev, | |
231 | .hook = ipt->tcfi_hook, | |
232 | .pf = NFPROTO_IPV4, | |
233 | }; | |
1da177e4 | 234 | |
14bbd6a5 PS |
235 | if (skb_unclone(skb, GFP_ATOMIC)) |
236 | return TC_ACT_UNSPEC; | |
1da177e4 | 237 | |
e9ce1cd3 | 238 | spin_lock(&ipt->tcf_lock); |
1da177e4 | 239 | |
9c4a4e48 | 240 | tcf_lastuse_update(&ipt->tcf_tm); |
bfe0d029 | 241 | bstats_update(&ipt->tcf_bstats, skb); |
1da177e4 LT |
242 | |
243 | /* yes, we have to worry about both in and out dev | |
cc7ec456 ED |
244 | * worry later - danger - this API seems to have changed |
245 | * from earlier kernels | |
246 | */ | |
613dbd95 | 247 | par.state = &state; |
7eb35586 JE |
248 | par.target = ipt->tcfi_t->u.kernel.target; |
249 | par.targinfo = ipt->tcfi_t->data; | |
250 | ret = par.target->target(skb, &par); | |
251 | ||
1da177e4 LT |
252 | switch (ret) { |
253 | case NF_ACCEPT: | |
254 | result = TC_ACT_OK; | |
255 | break; | |
256 | case NF_DROP: | |
257 | result = TC_ACT_SHOT; | |
e9ce1cd3 | 258 | ipt->tcf_qstats.drops++; |
1da177e4 | 259 | break; |
243bf6e2 | 260 | case XT_CONTINUE: |
1da177e4 LT |
261 | result = TC_ACT_PIPE; |
262 | break; | |
263 | default: | |
e87cc472 JP |
264 | net_notice_ratelimited("tc filter: Bogus netfilter code %d assume ACCEPT\n", |
265 | ret); | |
95df1b16 | 266 | result = TC_ACT_OK; |
1da177e4 LT |
267 | break; |
268 | } | |
e9ce1cd3 | 269 | spin_unlock(&ipt->tcf_lock); |
1da177e4 LT |
270 | return result; |
271 | ||
272 | } | |
273 | ||
0b0f43fe JHS |
274 | static int tcf_ipt_dump(struct sk_buff *skb, struct tc_action *a, int bind, |
275 | int ref) | |
1da177e4 | 276 | { |
27a884dc | 277 | unsigned char *b = skb_tail_pointer(skb); |
a85a970a | 278 | struct tcf_ipt *ipt = to_ipt(a); |
87a2e70d | 279 | struct xt_entry_target *t; |
1da177e4 LT |
280 | struct tcf_t tm; |
281 | struct tc_cnt c; | |
1da177e4 LT |
282 | |
283 | /* for simple targets kernel size == user size | |
cc7ec456 ED |
284 | * user name = target name |
285 | * for foolproof you need to not assume this | |
286 | */ | |
1da177e4 | 287 | |
ff25276d | 288 | spin_lock_bh(&ipt->tcf_lock); |
c7b1b249 | 289 | t = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC); |
e9ce1cd3 | 290 | if (unlikely(!t)) |
7ba699c6 | 291 | goto nla_put_failure; |
1da177e4 | 292 | |
036bb443 VB |
293 | c.bindcnt = atomic_read(&ipt->tcf_bindcnt) - bind; |
294 | c.refcnt = refcount_read(&ipt->tcf_refcnt) - ref; | |
e9ce1cd3 DM |
295 | strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name); |
296 | ||
1b34ec43 DM |
297 | if (nla_put(skb, TCA_IPT_TARG, ipt->tcfi_t->u.user.target_size, t) || |
298 | nla_put_u32(skb, TCA_IPT_INDEX, ipt->tcf_index) || | |
299 | nla_put_u32(skb, TCA_IPT_HOOK, ipt->tcfi_hook) || | |
300 | nla_put(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c) || | |
301 | nla_put_string(skb, TCA_IPT_TABLE, ipt->tcfi_tname)) | |
302 | goto nla_put_failure; | |
48d8ee16 JHS |
303 | |
304 | tcf_tm_dump(&tm, &ipt->tcf_tm); | |
9854518e | 305 | if (nla_put_64bit(skb, TCA_IPT_TM, sizeof(tm), &tm, TCA_IPT_PAD)) |
1b34ec43 | 306 | goto nla_put_failure; |
48d8ee16 | 307 | |
ff25276d | 308 | spin_unlock_bh(&ipt->tcf_lock); |
1da177e4 LT |
309 | kfree(t); |
310 | return skb->len; | |
311 | ||
7ba699c6 | 312 | nla_put_failure: |
ff25276d | 313 | spin_unlock_bh(&ipt->tcf_lock); |
dc5fc579 | 314 | nlmsg_trim(skb, b); |
1da177e4 LT |
315 | kfree(t); |
316 | return -1; | |
317 | } | |
318 | ||
ddf97ccd WC |
319 | static int tcf_ipt_walker(struct net *net, struct sk_buff *skb, |
320 | struct netlink_callback *cb, int type, | |
41780105 AA |
321 | const struct tc_action_ops *ops, |
322 | struct netlink_ext_ack *extack) | |
ddf97ccd WC |
323 | { |
324 | struct tc_action_net *tn = net_generic(net, ipt_net_id); | |
325 | ||
b3620145 | 326 | return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
ddf97ccd WC |
327 | } |
328 | ||
f061b48c | 329 | static int tcf_ipt_search(struct net *net, struct tc_action **a, u32 index) |
ddf97ccd WC |
330 | { |
331 | struct tc_action_net *tn = net_generic(net, ipt_net_id); | |
332 | ||
65a206c0 | 333 | return tcf_idr_search(tn, a, index); |
ddf97ccd WC |
334 | } |
335 | ||
1da177e4 LT |
336 | static struct tc_action_ops act_ipt_ops = { |
337 | .kind = "ipt", | |
eddd2cf1 | 338 | .id = TCA_ID_IPT, |
1da177e4 | 339 | .owner = THIS_MODULE, |
11b9695b | 340 | .act = tcf_ipt_act, |
1da177e4 | 341 | .dump = tcf_ipt_dump, |
86062033 | 342 | .cleanup = tcf_ipt_release, |
1da177e4 | 343 | .init = tcf_ipt_init, |
ddf97ccd WC |
344 | .walk = tcf_ipt_walker, |
345 | .lookup = tcf_ipt_search, | |
a85a970a | 346 | .size = sizeof(struct tcf_ipt), |
ddf97ccd WC |
347 | }; |
348 | ||
349 | static __net_init int ipt_init_net(struct net *net) | |
350 | { | |
351 | struct tc_action_net *tn = net_generic(net, ipt_net_id); | |
352 | ||
c7e460ce | 353 | return tc_action_net_init(tn, &act_ipt_ops); |
ddf97ccd WC |
354 | } |
355 | ||
039af9c6 | 356 | static void __net_exit ipt_exit_net(struct list_head *net_list) |
ddf97ccd | 357 | { |
039af9c6 | 358 | tc_action_net_exit(net_list, ipt_net_id); |
ddf97ccd WC |
359 | } |
360 | ||
361 | static struct pernet_operations ipt_net_ops = { | |
362 | .init = ipt_init_net, | |
039af9c6 | 363 | .exit_batch = ipt_exit_net, |
ddf97ccd WC |
364 | .id = &ipt_net_id, |
365 | .size = sizeof(struct tc_action_net), | |
1da177e4 LT |
366 | }; |
367 | ||
ddf97ccd WC |
368 | static int tcf_xt_walker(struct net *net, struct sk_buff *skb, |
369 | struct netlink_callback *cb, int type, | |
41780105 AA |
370 | const struct tc_action_ops *ops, |
371 | struct netlink_ext_ack *extack) | |
ddf97ccd WC |
372 | { |
373 | struct tc_action_net *tn = net_generic(net, xt_net_id); | |
374 | ||
b3620145 | 375 | return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
ddf97ccd WC |
376 | } |
377 | ||
f061b48c | 378 | static int tcf_xt_search(struct net *net, struct tc_action **a, u32 index) |
ddf97ccd WC |
379 | { |
380 | struct tc_action_net *tn = net_generic(net, xt_net_id); | |
381 | ||
65a206c0 | 382 | return tcf_idr_search(tn, a, index); |
ddf97ccd WC |
383 | } |
384 | ||
0dcffd09 JHS |
385 | static struct tc_action_ops act_xt_ops = { |
386 | .kind = "xt", | |
eddd2cf1 | 387 | .id = TCA_ID_XT, |
0dcffd09 | 388 | .owner = THIS_MODULE, |
11b9695b | 389 | .act = tcf_ipt_act, |
0dcffd09 | 390 | .dump = tcf_ipt_dump, |
86062033 | 391 | .cleanup = tcf_ipt_release, |
ddf97ccd WC |
392 | .init = tcf_xt_init, |
393 | .walk = tcf_xt_walker, | |
394 | .lookup = tcf_xt_search, | |
a85a970a | 395 | .size = sizeof(struct tcf_ipt), |
ddf97ccd WC |
396 | }; |
397 | ||
398 | static __net_init int xt_init_net(struct net *net) | |
399 | { | |
400 | struct tc_action_net *tn = net_generic(net, xt_net_id); | |
401 | ||
c7e460ce | 402 | return tc_action_net_init(tn, &act_xt_ops); |
ddf97ccd WC |
403 | } |
404 | ||
039af9c6 | 405 | static void __net_exit xt_exit_net(struct list_head *net_list) |
ddf97ccd | 406 | { |
039af9c6 | 407 | tc_action_net_exit(net_list, xt_net_id); |
ddf97ccd WC |
408 | } |
409 | ||
410 | static struct pernet_operations xt_net_ops = { | |
411 | .init = xt_init_net, | |
039af9c6 | 412 | .exit_batch = xt_exit_net, |
ddf97ccd WC |
413 | .id = &xt_net_id, |
414 | .size = sizeof(struct tc_action_net), | |
0dcffd09 JHS |
415 | }; |
416 | ||
417 | MODULE_AUTHOR("Jamal Hadi Salim(2002-13)"); | |
1da177e4 LT |
418 | MODULE_DESCRIPTION("Iptables target actions"); |
419 | MODULE_LICENSE("GPL"); | |
0dcffd09 | 420 | MODULE_ALIAS("act_xt"); |
1da177e4 | 421 | |
e9ce1cd3 | 422 | static int __init ipt_init_module(void) |
1da177e4 | 423 | { |
4f1e9d89 | 424 | int ret1, ret2; |
369ba567 | 425 | |
ddf97ccd | 426 | ret1 = tcf_register_action(&act_xt_ops, &xt_net_ops); |
0dcffd09 | 427 | if (ret1 < 0) |
ddf97ccd WC |
428 | pr_err("Failed to load xt action\n"); |
429 | ||
430 | ret2 = tcf_register_action(&act_ipt_ops, &ipt_net_ops); | |
0dcffd09 | 431 | if (ret2 < 0) |
ddf97ccd | 432 | pr_err("Failed to load ipt action\n"); |
0dcffd09 | 433 | |
369ba567 | 434 | if (ret1 < 0 && ret2 < 0) { |
0dcffd09 | 435 | return ret1; |
369ba567 | 436 | } else |
0dcffd09 | 437 | return 0; |
1da177e4 LT |
438 | } |
439 | ||
e9ce1cd3 | 440 | static void __exit ipt_cleanup_module(void) |
1da177e4 | 441 | { |
ddf97ccd WC |
442 | tcf_unregister_action(&act_ipt_ops, &ipt_net_ops); |
443 | tcf_unregister_action(&act_xt_ops, &xt_net_ops); | |
1da177e4 LT |
444 | } |
445 | ||
446 | module_init(ipt_init_module); | |
447 | module_exit(ipt_cleanup_module); |