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 #define IPT_TAB_MASK 15
33 static int ipt_net_id;
37 static int ipt_init_target(struct xt_entry_target *t, char *table, unsigned int hook)
39 struct xt_tgchk_param par;
40 struct xt_target *target;
43 target = xt_request_find_target(AF_INET, t->u.user.name,
46 return PTR_ERR(target);
48 t->u.kernel.target = target;
52 par.targinfo = t->data;
54 par.family = NFPROTO_IPV4;
56 ret = xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false);
58 module_put(t->u.kernel.target->me);
64 static void ipt_destroy_target(struct xt_entry_target *t)
66 struct xt_tgdtor_param par = {
67 .target = t->u.kernel.target,
69 .family = NFPROTO_IPV4,
71 if (par.target->destroy != NULL)
72 par.target->destroy(&par);
73 module_put(par.target->me);
76 static void tcf_ipt_release(struct tc_action *a, int bind)
78 struct tcf_ipt *ipt = to_ipt(a);
79 ipt_destroy_target(ipt->tcfi_t);
80 kfree(ipt->tcfi_tname);
84 static const struct nla_policy ipt_policy[TCA_IPT_MAX + 1] = {
85 [TCA_IPT_TABLE] = { .type = NLA_STRING, .len = IFNAMSIZ },
86 [TCA_IPT_HOOK] = { .type = NLA_U32 },
87 [TCA_IPT_INDEX] = { .type = NLA_U32 },
88 [TCA_IPT_TARG] = { .len = sizeof(struct xt_entry_target) },
91 static int __tcf_ipt_init(struct tc_action_net *tn, struct nlattr *nla,
92 struct nlattr *est, struct tc_action *a, int ovr,
95 struct nlattr *tb[TCA_IPT_MAX + 1];
97 struct xt_entry_target *td, *t;
99 int ret = 0, err, exists = 0;
106 err = nla_parse_nested(tb, TCA_IPT_MAX, nla, ipt_policy);
110 if (tb[TCA_IPT_INDEX] != NULL)
111 index = nla_get_u32(tb[TCA_IPT_INDEX]);
113 exists = tcf_hash_check(tn, index, a, bind);
117 if (tb[TCA_IPT_HOOK] == NULL || tb[TCA_IPT_TARG] == NULL) {
119 tcf_hash_release(a, bind);
123 td = (struct xt_entry_target *)nla_data(tb[TCA_IPT_TARG]);
124 if (nla_len(tb[TCA_IPT_TARG]) < td->u.target_size) {
126 tcf_hash_release(a, bind);
131 ret = tcf_hash_create(tn, index, est, a, sizeof(*ipt), bind,
137 if (bind)/* dont override defaults */
139 tcf_hash_release(a, bind);
146 hook = nla_get_u32(tb[TCA_IPT_HOOK]);
149 tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
150 if (unlikely(!tname))
152 if (tb[TCA_IPT_TABLE] == NULL ||
153 nla_strlcpy(tname, tb[TCA_IPT_TABLE], IFNAMSIZ) >= IFNAMSIZ)
154 strcpy(tname, "mangle");
156 t = kmemdup(td, td->u.target_size, GFP_KERNEL);
160 err = ipt_init_target(t, tname, hook);
164 spin_lock_bh(&ipt->tcf_lock);
165 if (ret != ACT_P_CREATED) {
166 ipt_destroy_target(ipt->tcfi_t);
167 kfree(ipt->tcfi_tname);
170 ipt->tcfi_tname = tname;
172 ipt->tcfi_hook = hook;
173 spin_unlock_bh(&ipt->tcf_lock);
174 if (ret == ACT_P_CREATED)
175 tcf_hash_insert(tn, a);
183 if (ret == ACT_P_CREATED)
184 tcf_hash_cleanup(a, est);
188 static int tcf_ipt_init(struct net *net, struct nlattr *nla,
189 struct nlattr *est, struct tc_action *a, int ovr,
192 struct tc_action_net *tn = net_generic(net, ipt_net_id);
194 return __tcf_ipt_init(tn, nla, est, a, ovr, bind);
197 static int tcf_xt_init(struct net *net, struct nlattr *nla,
198 struct nlattr *est, struct tc_action *a, int ovr,
201 struct tc_action_net *tn = net_generic(net, xt_net_id);
203 return __tcf_ipt_init(tn, nla, est, a, ovr, bind);
206 static int tcf_ipt(struct sk_buff *skb, const struct tc_action *a,
207 struct tcf_result *res)
209 int ret = 0, result = 0;
210 struct tcf_ipt *ipt = a->priv;
211 struct xt_action_param par;
213 if (skb_unclone(skb, GFP_ATOMIC))
214 return TC_ACT_UNSPEC;
216 spin_lock(&ipt->tcf_lock);
218 ipt->tcf_tm.lastuse = jiffies;
219 bstats_update(&ipt->tcf_bstats, skb);
221 /* yes, we have to worry about both in and out dev
222 * worry later - danger - this API seems to have changed
223 * from earlier kernels
225 par.net = dev_net(skb->dev);
228 par.hooknum = ipt->tcfi_hook;
229 par.target = ipt->tcfi_t->u.kernel.target;
230 par.targinfo = ipt->tcfi_t->data;
231 par.family = NFPROTO_IPV4;
232 ret = par.target->target(skb, &par);
239 result = TC_ACT_SHOT;
240 ipt->tcf_qstats.drops++;
243 result = TC_ACT_PIPE;
246 net_notice_ratelimited("tc filter: Bogus netfilter code %d assume ACCEPT\n",
248 result = TC_POLICE_OK;
251 spin_unlock(&ipt->tcf_lock);
256 static int tcf_ipt_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
258 unsigned char *b = skb_tail_pointer(skb);
259 struct tcf_ipt *ipt = a->priv;
260 struct xt_entry_target *t;
264 /* for simple targets kernel size == user size
265 * user name = target name
266 * for foolproof you need to not assume this
269 t = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC);
271 goto nla_put_failure;
273 c.bindcnt = ipt->tcf_bindcnt - bind;
274 c.refcnt = ipt->tcf_refcnt - ref;
275 strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name);
277 if (nla_put(skb, TCA_IPT_TARG, ipt->tcfi_t->u.user.target_size, t) ||
278 nla_put_u32(skb, TCA_IPT_INDEX, ipt->tcf_index) ||
279 nla_put_u32(skb, TCA_IPT_HOOK, ipt->tcfi_hook) ||
280 nla_put(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c) ||
281 nla_put_string(skb, TCA_IPT_TABLE, ipt->tcfi_tname))
282 goto nla_put_failure;
283 tm.install = jiffies_to_clock_t(jiffies - ipt->tcf_tm.install);
284 tm.lastuse = jiffies_to_clock_t(jiffies - ipt->tcf_tm.lastuse);
285 tm.expires = jiffies_to_clock_t(ipt->tcf_tm.expires);
286 if (nla_put_64bit(skb, TCA_IPT_TM, sizeof(tm), &tm, TCA_IPT_PAD))
287 goto nla_put_failure;
297 static int tcf_ipt_walker(struct net *net, struct sk_buff *skb,
298 struct netlink_callback *cb, int type,
301 struct tc_action_net *tn = net_generic(net, ipt_net_id);
303 return tcf_generic_walker(tn, skb, cb, type, a);
306 static int tcf_ipt_search(struct net *net, struct tc_action *a, u32 index)
308 struct tc_action_net *tn = net_generic(net, ipt_net_id);
310 return tcf_hash_search(tn, a, index);
313 static struct tc_action_ops act_ipt_ops = {
316 .owner = THIS_MODULE,
318 .dump = tcf_ipt_dump,
319 .cleanup = tcf_ipt_release,
320 .init = tcf_ipt_init,
321 .walk = tcf_ipt_walker,
322 .lookup = tcf_ipt_search,
325 static __net_init int ipt_init_net(struct net *net)
327 struct tc_action_net *tn = net_generic(net, ipt_net_id);
329 return tc_action_net_init(tn, &act_ipt_ops, IPT_TAB_MASK);
332 static void __net_exit ipt_exit_net(struct net *net)
334 struct tc_action_net *tn = net_generic(net, ipt_net_id);
336 tc_action_net_exit(tn);
339 static struct pernet_operations ipt_net_ops = {
340 .init = ipt_init_net,
341 .exit = ipt_exit_net,
343 .size = sizeof(struct tc_action_net),
346 static int tcf_xt_walker(struct net *net, struct sk_buff *skb,
347 struct netlink_callback *cb, int type,
350 struct tc_action_net *tn = net_generic(net, xt_net_id);
352 return tcf_generic_walker(tn, skb, cb, type, a);
355 static int tcf_xt_search(struct net *net, struct tc_action *a, u32 index)
357 struct tc_action_net *tn = net_generic(net, xt_net_id);
359 return tcf_hash_search(tn, a, index);
362 static struct tc_action_ops act_xt_ops = {
365 .owner = THIS_MODULE,
367 .dump = tcf_ipt_dump,
368 .cleanup = tcf_ipt_release,
370 .walk = tcf_xt_walker,
371 .lookup = tcf_xt_search,
374 static __net_init int xt_init_net(struct net *net)
376 struct tc_action_net *tn = net_generic(net, xt_net_id);
378 return tc_action_net_init(tn, &act_xt_ops, IPT_TAB_MASK);
381 static void __net_exit xt_exit_net(struct net *net)
383 struct tc_action_net *tn = net_generic(net, xt_net_id);
385 tc_action_net_exit(tn);
388 static struct pernet_operations xt_net_ops = {
392 .size = sizeof(struct tc_action_net),
395 MODULE_AUTHOR("Jamal Hadi Salim(2002-13)");
396 MODULE_DESCRIPTION("Iptables target actions");
397 MODULE_LICENSE("GPL");
398 MODULE_ALIAS("act_xt");
400 static int __init ipt_init_module(void)
404 ret1 = tcf_register_action(&act_xt_ops, &xt_net_ops);
406 pr_err("Failed to load xt action\n");
408 ret2 = tcf_register_action(&act_ipt_ops, &ipt_net_ops);
410 pr_err("Failed to load ipt action\n");
412 if (ret1 < 0 && ret2 < 0) {
418 static void __exit ipt_cleanup_module(void)
420 tcf_unregister_action(&act_ipt_ops, &ipt_net_ops);
421 tcf_unregister_action(&act_xt_ops, &xt_net_ops);
424 module_init(ipt_init_module);
425 module_exit(ipt_cleanup_module);