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)
70 struct xt_tgdtor_param par = {
71 .target = t->u.kernel.target,
73 .family = NFPROTO_IPV4,
75 if (par.target->destroy != NULL)
76 par.target->destroy(&par);
77 module_put(par.target->me);
80 static void tcf_ipt_release(struct tc_action *a)
82 struct tcf_ipt *ipt = to_ipt(a);
85 ipt_destroy_target(ipt->tcfi_t);
88 kfree(ipt->tcfi_tname);
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 },
95 [TCA_IPT_TARG] = { .len = sizeof(struct xt_entry_target) },
98 static int __tcf_ipt_init(struct net *net, unsigned int id, struct nlattr *nla,
99 struct nlattr *est, struct tc_action **a,
100 const struct tc_action_ops *ops, int ovr, int bind)
102 struct tc_action_net *tn = net_generic(net, id);
103 struct nlattr *tb[TCA_IPT_MAX + 1];
105 struct xt_entry_target *td, *t;
115 err = nla_parse_nested(tb, TCA_IPT_MAX, nla, ipt_policy, NULL);
119 if (tb[TCA_IPT_INDEX] != NULL)
120 index = nla_get_u32(tb[TCA_IPT_INDEX]);
122 err = tcf_idr_check_alloc(tn, &index, a, bind);
129 if (tb[TCA_IPT_HOOK] == NULL || tb[TCA_IPT_TARG] == NULL) {
131 tcf_idr_release(*a, bind);
133 tcf_idr_cleanup(tn, index);
137 td = (struct xt_entry_target *)nla_data(tb[TCA_IPT_TARG]);
138 if (nla_len(tb[TCA_IPT_TARG]) != td->u.target_size) {
140 tcf_idr_release(*a, bind);
142 tcf_idr_cleanup(tn, index);
147 ret = tcf_idr_create(tn, index, est, a, ops, bind,
150 tcf_idr_cleanup(tn, index);
155 if (bind)/* dont override defaults */
159 tcf_idr_release(*a, bind);
163 hook = nla_get_u32(tb[TCA_IPT_HOOK]);
166 tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
167 if (unlikely(!tname))
169 if (tb[TCA_IPT_TABLE] == NULL ||
170 nla_strlcpy(tname, tb[TCA_IPT_TABLE], IFNAMSIZ) >= IFNAMSIZ)
171 strcpy(tname, "mangle");
173 t = kmemdup(td, td->u.target_size, GFP_KERNEL);
177 err = ipt_init_target(net, t, tname, hook);
183 spin_lock_bh(&ipt->tcf_lock);
184 if (ret != ACT_P_CREATED) {
185 ipt_destroy_target(ipt->tcfi_t);
186 kfree(ipt->tcfi_tname);
189 ipt->tcfi_tname = tname;
191 ipt->tcfi_hook = hook;
192 spin_unlock_bh(&ipt->tcf_lock);
193 if (ret == ACT_P_CREATED)
194 tcf_idr_insert(tn, *a);
202 if (ret == ACT_P_CREATED)
203 tcf_idr_release(*a, bind);
207 static int tcf_ipt_init(struct net *net, struct nlattr *nla,
208 struct nlattr *est, struct tc_action **a, int ovr,
209 int bind, bool rtnl_held,
210 struct netlink_ext_ack *extack)
212 return __tcf_ipt_init(net, ipt_net_id, nla, est, a, &act_ipt_ops, ovr,
216 static int tcf_xt_init(struct net *net, struct nlattr *nla,
217 struct nlattr *est, struct tc_action **a, int ovr,
218 int bind, bool unlocked,
219 struct netlink_ext_ack *extack)
221 return __tcf_ipt_init(net, xt_net_id, nla, est, a, &act_xt_ops, ovr,
225 static int tcf_ipt_act(struct sk_buff *skb, const struct tc_action *a,
226 struct tcf_result *res)
228 int ret = 0, result = 0;
229 struct tcf_ipt *ipt = to_ipt(a);
230 struct xt_action_param par;
231 struct nf_hook_state state = {
232 .net = dev_net(skb->dev),
234 .hook = ipt->tcfi_hook,
238 if (skb_unclone(skb, GFP_ATOMIC))
239 return TC_ACT_UNSPEC;
241 spin_lock(&ipt->tcf_lock);
243 tcf_lastuse_update(&ipt->tcf_tm);
244 bstats_update(&ipt->tcf_bstats, skb);
246 /* yes, we have to worry about both in and out dev
247 * worry later - danger - this API seems to have changed
248 * from earlier kernels
251 par.target = ipt->tcfi_t->u.kernel.target;
252 par.targinfo = ipt->tcfi_t->data;
253 ret = par.target->target(skb, &par);
260 result = TC_ACT_SHOT;
261 ipt->tcf_qstats.drops++;
264 result = TC_ACT_PIPE;
267 net_notice_ratelimited("tc filter: Bogus netfilter code %d assume ACCEPT\n",
272 spin_unlock(&ipt->tcf_lock);
277 static int tcf_ipt_dump(struct sk_buff *skb, struct tc_action *a, int bind,
280 unsigned char *b = skb_tail_pointer(skb);
281 struct tcf_ipt *ipt = to_ipt(a);
282 struct xt_entry_target *t;
286 /* for simple targets kernel size == user size
287 * user name = target name
288 * for foolproof you need to not assume this
291 spin_lock_bh(&ipt->tcf_lock);
292 t = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC);
294 goto nla_put_failure;
296 c.bindcnt = atomic_read(&ipt->tcf_bindcnt) - bind;
297 c.refcnt = refcount_read(&ipt->tcf_refcnt) - ref;
298 strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name);
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;
307 tcf_tm_dump(&tm, &ipt->tcf_tm);
308 if (nla_put_64bit(skb, TCA_IPT_TM, sizeof(tm), &tm, TCA_IPT_PAD))
309 goto nla_put_failure;
311 spin_unlock_bh(&ipt->tcf_lock);
316 spin_unlock_bh(&ipt->tcf_lock);
322 static int tcf_ipt_walker(struct net *net, struct sk_buff *skb,
323 struct netlink_callback *cb, int type,
324 const struct tc_action_ops *ops,
325 struct netlink_ext_ack *extack)
327 struct tc_action_net *tn = net_generic(net, ipt_net_id);
329 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
332 static int tcf_ipt_search(struct net *net, struct tc_action **a, u32 index)
334 struct tc_action_net *tn = net_generic(net, ipt_net_id);
336 return tcf_idr_search(tn, a, index);
339 static struct tc_action_ops act_ipt_ops = {
342 .owner = THIS_MODULE,
344 .dump = tcf_ipt_dump,
345 .cleanup = tcf_ipt_release,
346 .init = tcf_ipt_init,
347 .walk = tcf_ipt_walker,
348 .lookup = tcf_ipt_search,
349 .size = sizeof(struct tcf_ipt),
352 static __net_init int ipt_init_net(struct net *net)
354 struct tc_action_net *tn = net_generic(net, ipt_net_id);
356 return tc_action_net_init(tn, &act_ipt_ops);
359 static void __net_exit ipt_exit_net(struct list_head *net_list)
361 tc_action_net_exit(net_list, ipt_net_id);
364 static struct pernet_operations ipt_net_ops = {
365 .init = ipt_init_net,
366 .exit_batch = ipt_exit_net,
368 .size = sizeof(struct tc_action_net),
371 static int tcf_xt_walker(struct net *net, struct sk_buff *skb,
372 struct netlink_callback *cb, int type,
373 const struct tc_action_ops *ops,
374 struct netlink_ext_ack *extack)
376 struct tc_action_net *tn = net_generic(net, xt_net_id);
378 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
381 static int tcf_xt_search(struct net *net, struct tc_action **a, u32 index)
383 struct tc_action_net *tn = net_generic(net, xt_net_id);
385 return tcf_idr_search(tn, a, index);
388 static struct tc_action_ops act_xt_ops = {
391 .owner = THIS_MODULE,
393 .dump = tcf_ipt_dump,
394 .cleanup = tcf_ipt_release,
396 .walk = tcf_xt_walker,
397 .lookup = tcf_xt_search,
398 .size = sizeof(struct tcf_ipt),
401 static __net_init int xt_init_net(struct net *net)
403 struct tc_action_net *tn = net_generic(net, xt_net_id);
405 return tc_action_net_init(tn, &act_xt_ops);
408 static void __net_exit xt_exit_net(struct list_head *net_list)
410 tc_action_net_exit(net_list, xt_net_id);
413 static struct pernet_operations xt_net_ops = {
415 .exit_batch = xt_exit_net,
417 .size = sizeof(struct tc_action_net),
420 MODULE_AUTHOR("Jamal Hadi Salim(2002-13)");
421 MODULE_DESCRIPTION("Iptables target actions");
422 MODULE_LICENSE("GPL");
423 MODULE_ALIAS("act_xt");
425 static int __init ipt_init_module(void)
429 ret1 = tcf_register_action(&act_xt_ops, &xt_net_ops);
431 pr_err("Failed to load xt action\n");
433 ret2 = tcf_register_action(&act_ipt_ops, &ipt_net_ops);
435 pr_err("Failed to load ipt action\n");
437 if (ret1 < 0 && ret2 < 0) {
443 static void __exit ipt_cleanup_module(void)
445 tcf_unregister_action(&act_ipt_ops, &ipt_net_ops);
446 tcf_unregister_action(&act_xt_ops, &xt_net_ops);
449 module_init(ipt_init_module);
450 module_exit(ipt_cleanup_module);