2 * net/sched/act_ipt.c iptables target interface
4 *TODO: Add other tables. For now we only support the ipv4 table targets
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.
11 * Copyright: Jamal Hadi Salim (2002-13)
14 #include <linux/types.h>
15 #include <linux/kernel.h>
16 #include <linux/string.h>
17 #include <linux/errno.h>
18 #include <linux/skbuff.h>
19 #include <linux/rtnetlink.h>
20 #include <linux/module.h>
21 #include <linux/init.h>
22 #include <linux/slab.h>
23 #include <net/netlink.h>
24 #include <net/pkt_sched.h>
25 #include <linux/tc_act/tc_ipt.h>
26 #include <net/tc_act/tc_ipt.h>
28 #include <linux/netfilter_ipv4/ip_tables.h>
31 static unsigned int ipt_net_id;
32 static struct tc_action_ops act_ipt_ops;
34 static unsigned int xt_net_id;
35 static struct tc_action_ops act_xt_ops;
37 static int ipt_init_target(struct net *net, struct xt_entry_target *t,
38 char *table, unsigned int hook)
40 struct xt_tgchk_param par;
41 struct xt_target *target;
42 struct ipt_entry e = {};
45 target = xt_request_find_target(AF_INET, t->u.user.name,
48 return PTR_ERR(target);
50 t->u.kernel.target = target;
51 memset(&par, 0, sizeof(par));
56 par.targinfo = t->data;
58 par.family = NFPROTO_IPV4;
60 ret = xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false);
62 module_put(t->u.kernel.target->me);
68 static void ipt_destroy_target(struct xt_entry_target *t, struct net *net)
70 struct xt_tgdtor_param par = {
71 .target = t->u.kernel.target,
73 .family = NFPROTO_IPV4,
76 if (par.target->destroy != NULL)
77 par.target->destroy(&par);
78 module_put(par.target->me);
81 static void tcf_ipt_release(struct tc_action *a, int bind)
83 struct tcf_ipt *ipt = to_ipt(a);
86 ipt_destroy_target(ipt->tcfi_t, a->idrinfo->net);
89 kfree(ipt->tcfi_tname);
92 static const struct nla_policy ipt_policy[TCA_IPT_MAX + 1] = {
93 [TCA_IPT_TABLE] = { .type = NLA_STRING, .len = IFNAMSIZ },
94 [TCA_IPT_HOOK] = { .type = NLA_U32 },
95 [TCA_IPT_INDEX] = { .type = NLA_U32 },
96 [TCA_IPT_TARG] = { .len = sizeof(struct xt_entry_target) },
99 static int __tcf_ipt_init(struct net *net, unsigned int id, struct nlattr *nla,
100 struct nlattr *est, struct tc_action **a,
101 const struct tc_action_ops *ops, int ovr, int bind)
103 struct tc_action_net *tn = net_generic(net, id);
104 struct nlattr *tb[TCA_IPT_MAX + 1];
106 struct xt_entry_target *td, *t;
116 err = nla_parse_nested(tb, TCA_IPT_MAX, nla, ipt_policy, NULL);
120 if (tb[TCA_IPT_INDEX] != NULL)
121 index = nla_get_u32(tb[TCA_IPT_INDEX]);
123 exists = tcf_idr_check(tn, index, a, bind);
127 if (tb[TCA_IPT_HOOK] == NULL || tb[TCA_IPT_TARG] == NULL) {
129 tcf_idr_release(*a, bind);
133 td = (struct xt_entry_target *)nla_data(tb[TCA_IPT_TARG]);
134 if (nla_len(tb[TCA_IPT_TARG]) < td->u.target_size) {
136 tcf_idr_release(*a, bind);
141 ret = tcf_idr_create(tn, index, est, a, ops, bind,
147 if (bind)/* dont override defaults */
149 tcf_idr_release(*a, bind);
154 hook = nla_get_u32(tb[TCA_IPT_HOOK]);
157 tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
158 if (unlikely(!tname))
160 if (tb[TCA_IPT_TABLE] == NULL ||
161 nla_strlcpy(tname, tb[TCA_IPT_TABLE], IFNAMSIZ) >= IFNAMSIZ)
162 strcpy(tname, "mangle");
164 t = kmemdup(td, td->u.target_size, GFP_KERNEL);
168 err = ipt_init_target(net, t, tname, hook);
174 spin_lock_bh(&ipt->tcf_lock);
175 if (ret != ACT_P_CREATED) {
176 ipt_destroy_target(ipt->tcfi_t, net);
177 kfree(ipt->tcfi_tname);
180 ipt->tcfi_tname = tname;
182 ipt->tcfi_hook = hook;
183 spin_unlock_bh(&ipt->tcf_lock);
184 if (ret == ACT_P_CREATED)
185 tcf_idr_insert(tn, *a);
193 if (ret == ACT_P_CREATED)
194 tcf_idr_release(*a, bind);
198 static int tcf_ipt_init(struct net *net, struct nlattr *nla,
199 struct nlattr *est, struct tc_action **a, int ovr,
202 return __tcf_ipt_init(net, ipt_net_id, nla, est, a, &act_ipt_ops, ovr,
206 static int tcf_xt_init(struct net *net, struct nlattr *nla,
207 struct nlattr *est, struct tc_action **a, int ovr,
210 return __tcf_ipt_init(net, xt_net_id, nla, est, a, &act_xt_ops, ovr,
214 static int tcf_ipt(struct sk_buff *skb, const struct tc_action *a,
215 struct tcf_result *res)
217 int ret = 0, result = 0;
218 struct tcf_ipt *ipt = to_ipt(a);
219 struct xt_action_param par;
220 struct nf_hook_state state = {
221 .net = dev_net(skb->dev),
223 .hook = ipt->tcfi_hook,
227 if (skb_unclone(skb, GFP_ATOMIC))
228 return TC_ACT_UNSPEC;
230 spin_lock(&ipt->tcf_lock);
232 tcf_lastuse_update(&ipt->tcf_tm);
233 bstats_update(&ipt->tcf_bstats, skb);
235 /* yes, we have to worry about both in and out dev
236 * worry later - danger - this API seems to have changed
237 * from earlier kernels
240 par.target = ipt->tcfi_t->u.kernel.target;
241 par.targinfo = ipt->tcfi_t->data;
242 ret = par.target->target(skb, &par);
249 result = TC_ACT_SHOT;
250 ipt->tcf_qstats.drops++;
253 result = TC_ACT_PIPE;
256 net_notice_ratelimited("tc filter: Bogus netfilter code %d assume ACCEPT\n",
261 spin_unlock(&ipt->tcf_lock);
266 static int tcf_ipt_dump(struct sk_buff *skb, struct tc_action *a, int bind,
269 unsigned char *b = skb_tail_pointer(skb);
270 struct tcf_ipt *ipt = to_ipt(a);
271 struct xt_entry_target *t;
275 /* for simple targets kernel size == user size
276 * user name = target name
277 * for foolproof you need to not assume this
280 t = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC);
282 goto nla_put_failure;
284 c.bindcnt = ipt->tcf_bindcnt - bind;
285 c.refcnt = ipt->tcf_refcnt - ref;
286 strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name);
288 if (nla_put(skb, TCA_IPT_TARG, ipt->tcfi_t->u.user.target_size, t) ||
289 nla_put_u32(skb, TCA_IPT_INDEX, ipt->tcf_index) ||
290 nla_put_u32(skb, TCA_IPT_HOOK, ipt->tcfi_hook) ||
291 nla_put(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c) ||
292 nla_put_string(skb, TCA_IPT_TABLE, ipt->tcfi_tname))
293 goto nla_put_failure;
295 tcf_tm_dump(&tm, &ipt->tcf_tm);
296 if (nla_put_64bit(skb, TCA_IPT_TM, sizeof(tm), &tm, TCA_IPT_PAD))
297 goto nla_put_failure;
308 static int tcf_ipt_walker(struct net *net, struct sk_buff *skb,
309 struct netlink_callback *cb, int type,
310 const struct tc_action_ops *ops)
312 struct tc_action_net *tn = net_generic(net, ipt_net_id);
314 return tcf_generic_walker(tn, skb, cb, type, ops);
317 static int tcf_ipt_search(struct net *net, struct tc_action **a, u32 index)
319 struct tc_action_net *tn = net_generic(net, ipt_net_id);
321 return tcf_idr_search(tn, a, index);
324 static struct tc_action_ops act_ipt_ops = {
327 .owner = THIS_MODULE,
329 .dump = tcf_ipt_dump,
330 .cleanup = tcf_ipt_release,
331 .init = tcf_ipt_init,
332 .walk = tcf_ipt_walker,
333 .lookup = tcf_ipt_search,
334 .size = sizeof(struct tcf_ipt),
337 static __net_init int ipt_init_net(struct net *net)
339 struct tc_action_net *tn = net_generic(net, ipt_net_id);
341 return tc_action_net_init(net, tn, &act_ipt_ops);
344 static void __net_exit ipt_exit_net(struct net *net)
346 struct tc_action_net *tn = net_generic(net, ipt_net_id);
348 tc_action_net_exit(tn);
351 static struct pernet_operations ipt_net_ops = {
352 .init = ipt_init_net,
353 .exit = ipt_exit_net,
355 .size = sizeof(struct tc_action_net),
358 static int tcf_xt_walker(struct net *net, struct sk_buff *skb,
359 struct netlink_callback *cb, int type,
360 const struct tc_action_ops *ops)
362 struct tc_action_net *tn = net_generic(net, xt_net_id);
364 return tcf_generic_walker(tn, skb, cb, type, ops);
367 static int tcf_xt_search(struct net *net, struct tc_action **a, u32 index)
369 struct tc_action_net *tn = net_generic(net, xt_net_id);
371 return tcf_idr_search(tn, a, index);
374 static struct tc_action_ops act_xt_ops = {
377 .owner = THIS_MODULE,
379 .dump = tcf_ipt_dump,
380 .cleanup = tcf_ipt_release,
382 .walk = tcf_xt_walker,
383 .lookup = tcf_xt_search,
384 .size = sizeof(struct tcf_ipt),
387 static __net_init int xt_init_net(struct net *net)
389 struct tc_action_net *tn = net_generic(net, xt_net_id);
391 return tc_action_net_init(net, tn, &act_xt_ops);
394 static void __net_exit xt_exit_net(struct net *net)
396 struct tc_action_net *tn = net_generic(net, xt_net_id);
398 tc_action_net_exit(tn);
401 static struct pernet_operations xt_net_ops = {
405 .size = sizeof(struct tc_action_net),
408 MODULE_AUTHOR("Jamal Hadi Salim(2002-13)");
409 MODULE_DESCRIPTION("Iptables target actions");
410 MODULE_LICENSE("GPL");
411 MODULE_ALIAS("act_xt");
413 static int __init ipt_init_module(void)
417 ret1 = tcf_register_action(&act_xt_ops, &xt_net_ops);
419 pr_err("Failed to load xt action\n");
421 ret2 = tcf_register_action(&act_ipt_ops, &ipt_net_ops);
423 pr_err("Failed to load ipt action\n");
425 if (ret1 < 0 && ret2 < 0) {
431 static void __exit ipt_cleanup_module(void)
433 tcf_unregister_action(&act_ipt_ops, &ipt_net_ops);
434 tcf_unregister_action(&act_xt_ops, &xt_net_ops);
437 module_init(ipt_init_module);
438 module_exit(ipt_cleanup_module);