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_init_target(struct xt_entry_target *t, char *table, unsigned int hook)
35 struct xt_tgchk_param par;
36 struct xt_target *target;
37 struct ipt_entry e = {};
40 target = xt_request_find_target(AF_INET, t->u.user.name,
43 return PTR_ERR(target);
45 t->u.kernel.target = target;
46 memset(&par, 0, sizeof(par));
50 par.targinfo = t->data;
52 par.family = NFPROTO_IPV4;
54 ret = xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false);
56 module_put(t->u.kernel.target->me);
62 static void ipt_destroy_target(struct xt_entry_target *t)
64 struct xt_tgdtor_param par = {
65 .target = t->u.kernel.target,
68 if (par.target->destroy != NULL)
69 par.target->destroy(&par);
70 module_put(par.target->me);
73 static void tcf_ipt_release(struct tc_action *a, int bind)
75 struct tcf_ipt *ipt = to_ipt(a);
76 ipt_destroy_target(ipt->tcfi_t);
77 kfree(ipt->tcfi_tname);
81 static const struct nla_policy ipt_policy[TCA_IPT_MAX + 1] = {
82 [TCA_IPT_TABLE] = { .type = NLA_STRING, .len = IFNAMSIZ },
83 [TCA_IPT_HOOK] = { .type = NLA_U32 },
84 [TCA_IPT_INDEX] = { .type = NLA_U32 },
85 [TCA_IPT_TARG] = { .len = sizeof(struct xt_entry_target) },
88 static int tcf_ipt_init(struct net *net, struct nlattr *nla, struct nlattr *est,
89 struct tc_action *a, int ovr, int bind)
91 struct nlattr *tb[TCA_IPT_MAX + 1];
93 struct xt_entry_target *td, *t;
102 err = nla_parse_nested(tb, TCA_IPT_MAX, nla, ipt_policy);
106 if (tb[TCA_IPT_HOOK] == NULL)
108 if (tb[TCA_IPT_TARG] == NULL)
111 td = (struct xt_entry_target *)nla_data(tb[TCA_IPT_TARG]);
112 if (nla_len(tb[TCA_IPT_TARG]) < td->u.target_size)
115 if (tb[TCA_IPT_INDEX] != NULL)
116 index = nla_get_u32(tb[TCA_IPT_INDEX]);
118 if (!tcf_hash_check(index, a, bind) ) {
119 ret = tcf_hash_create(index, est, a, sizeof(*ipt), bind, false);
124 if (bind)/* dont override defaults */
126 tcf_hash_release(a, bind);
133 hook = nla_get_u32(tb[TCA_IPT_HOOK]);
136 tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
137 if (unlikely(!tname))
139 if (tb[TCA_IPT_TABLE] == NULL ||
140 nla_strlcpy(tname, tb[TCA_IPT_TABLE], IFNAMSIZ) >= IFNAMSIZ)
141 strcpy(tname, "mangle");
143 t = kmemdup(td, td->u.target_size, GFP_KERNEL);
147 err = ipt_init_target(t, tname, hook);
151 spin_lock_bh(&ipt->tcf_lock);
152 if (ret != ACT_P_CREATED) {
153 ipt_destroy_target(ipt->tcfi_t);
154 kfree(ipt->tcfi_tname);
157 ipt->tcfi_tname = tname;
159 ipt->tcfi_hook = hook;
160 spin_unlock_bh(&ipt->tcf_lock);
161 if (ret == ACT_P_CREATED)
170 if (ret == ACT_P_CREATED)
171 tcf_hash_cleanup(a, est);
175 static int tcf_ipt(struct sk_buff *skb, const struct tc_action *a,
176 struct tcf_result *res)
178 int ret = 0, result = 0;
179 struct tcf_ipt *ipt = a->priv;
180 struct xt_action_param par;
182 if (skb_unclone(skb, GFP_ATOMIC))
183 return TC_ACT_UNSPEC;
185 spin_lock(&ipt->tcf_lock);
187 ipt->tcf_tm.lastuse = jiffies;
188 bstats_update(&ipt->tcf_bstats, skb);
190 /* yes, we have to worry about both in and out dev
191 * worry later - danger - this API seems to have changed
192 * from earlier kernels
194 par.net = dev_net(skb->dev);
197 par.hooknum = ipt->tcfi_hook;
198 par.target = ipt->tcfi_t->u.kernel.target;
199 par.targinfo = ipt->tcfi_t->data;
200 ret = par.target->target(skb, &par);
207 result = TC_ACT_SHOT;
208 ipt->tcf_qstats.drops++;
211 result = TC_ACT_PIPE;
214 net_notice_ratelimited("tc filter: Bogus netfilter code %d assume ACCEPT\n",
216 result = TC_POLICE_OK;
219 spin_unlock(&ipt->tcf_lock);
224 static int tcf_ipt_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
226 unsigned char *b = skb_tail_pointer(skb);
227 struct tcf_ipt *ipt = a->priv;
228 struct xt_entry_target *t;
232 /* for simple targets kernel size == user size
233 * user name = target name
234 * for foolproof you need to not assume this
237 t = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC);
239 goto nla_put_failure;
241 c.bindcnt = ipt->tcf_bindcnt - bind;
242 c.refcnt = ipt->tcf_refcnt - ref;
243 strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name);
245 if (nla_put(skb, TCA_IPT_TARG, ipt->tcfi_t->u.user.target_size, t) ||
246 nla_put_u32(skb, TCA_IPT_INDEX, ipt->tcf_index) ||
247 nla_put_u32(skb, TCA_IPT_HOOK, ipt->tcfi_hook) ||
248 nla_put(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c) ||
249 nla_put_string(skb, TCA_IPT_TABLE, ipt->tcfi_tname))
250 goto nla_put_failure;
251 tm.install = jiffies_to_clock_t(jiffies - ipt->tcf_tm.install);
252 tm.lastuse = jiffies_to_clock_t(jiffies - ipt->tcf_tm.lastuse);
253 tm.expires = jiffies_to_clock_t(ipt->tcf_tm.expires);
254 if (nla_put(skb, TCA_IPT_TM, sizeof (tm), &tm))
255 goto nla_put_failure;
265 static struct tc_action_ops act_ipt_ops = {
268 .owner = THIS_MODULE,
270 .dump = tcf_ipt_dump,
271 .cleanup = tcf_ipt_release,
272 .init = tcf_ipt_init,
275 static struct tc_action_ops act_xt_ops = {
278 .owner = THIS_MODULE,
280 .dump = tcf_ipt_dump,
281 .cleanup = tcf_ipt_release,
282 .init = tcf_ipt_init,
285 MODULE_AUTHOR("Jamal Hadi Salim(2002-13)");
286 MODULE_DESCRIPTION("Iptables target actions");
287 MODULE_LICENSE("GPL");
288 MODULE_ALIAS("act_xt");
290 static int __init ipt_init_module(void)
294 ret1 = tcf_register_action(&act_xt_ops, IPT_TAB_MASK);
296 printk("Failed to load xt action\n");
297 ret2 = tcf_register_action(&act_ipt_ops, IPT_TAB_MASK);
299 printk("Failed to load ipt action\n");
301 if (ret1 < 0 && ret2 < 0) {
307 static void __exit ipt_cleanup_module(void)
309 tcf_unregister_action(&act_xt_ops);
310 tcf_unregister_action(&act_ipt_ops);
313 module_init(ipt_init_module);
314 module_exit(ipt_cleanup_module);