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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Joe Perchese87cc472012-05-13 21:56:26 +00002 * net/sched/ipt.c iptables target interface
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
4 *TODO: Add other tables. For now we only support the ipv4 table targets
5 *
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.
10 *
11 * Copyright: Jamal Hadi Salim (2002-4)
12 */
13
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/types.h>
15#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/string.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/errno.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/skbuff.h>
19#include <linux/rtnetlink.h>
20#include <linux/module.h>
21#include <linux/init.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090022#include <linux/slab.h>
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -070023#include <net/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <net/pkt_sched.h>
25#include <linux/tc_act/tc_ipt.h>
26#include <net/tc_act/tc_ipt.h>
27
28#include <linux/netfilter_ipv4/ip_tables.h>
29
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
David S. Millere9ce1cd2006-08-21 23:54:55 -070031#define IPT_TAB_MASK 15
32static struct tcf_common *tcf_ipt_ht[IPT_TAB_MASK + 1];
33static u32 ipt_idx_gen;
Linus Torvalds1da177e2005-04-16 15:20:36 -070034static DEFINE_RWLOCK(ipt_lock);
35
David S. Millere9ce1cd2006-08-21 23:54:55 -070036static struct tcf_hashinfo ipt_hash_info = {
37 .htab = tcf_ipt_ht,
38 .hmask = IPT_TAB_MASK,
39 .lock = &ipt_lock,
40};
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Jan Engelhardt87a2e70d2010-10-13 16:11:22 +020042static int ipt_init_target(struct xt_entry_target *t, char *table, unsigned int hook)
Linus Torvalds1da177e2005-04-16 15:20:36 -070043{
Jan Engelhardtaf5d6dc2008-10-08 11:35:19 +020044 struct xt_tgchk_param par;
Jan Engelhardte60a13e2007-02-07 15:12:33 -080045 struct xt_target *target;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 int ret = 0;
47
Patrick McHardy239a87c2007-02-02 00:40:36 -080048 target = xt_request_find_target(AF_INET, t->u.user.name,
49 t->u.user.revision);
Jan Engelhardtd2a7b6b2009-07-10 18:55:11 +020050 if (IS_ERR(target))
51 return PTR_ERR(target);
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 t->u.kernel.target = target;
Jan Engelhardtaf5d6dc2008-10-08 11:35:19 +020054 par.table = table;
55 par.entryinfo = NULL;
56 par.target = target;
57 par.targinfo = t->data;
58 par.hook_mask = hook;
Jan Engelhardt916a9172008-10-08 11:35:20 +020059 par.family = NFPROTO_IPV4;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
Jan Engelhardt916a9172008-10-08 11:35:20 +020061 ret = xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false);
Jan Engelhardt367c6792008-10-08 11:35:17 +020062 if (ret < 0) {
Patrick McHardy239a87c2007-02-02 00:40:36 -080063 module_put(t->u.kernel.target->me);
Patrick McHardy18118cd2006-04-24 17:18:59 -070064 return ret;
Patrick McHardy239a87c2007-02-02 00:40:36 -080065 }
Jan Engelhardt367c6792008-10-08 11:35:17 +020066 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067}
68
Jan Engelhardt87a2e70d2010-10-13 16:11:22 +020069static void ipt_destroy_target(struct xt_entry_target *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -070070{
Jan Engelhardta2df1642008-10-08 11:35:19 +020071 struct xt_tgdtor_param par = {
72 .target = t->u.kernel.target,
73 .targinfo = t->data,
74 };
75 if (par.target->destroy != NULL)
76 par.target->destroy(&par);
77 module_put(par.target->me);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078}
79
David S. Millere9ce1cd2006-08-21 23:54:55 -070080static int tcf_ipt_release(struct tcf_ipt *ipt, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -070081{
82 int ret = 0;
David S. Millere9ce1cd2006-08-21 23:54:55 -070083 if (ipt) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 if (bind)
David S. Millere9ce1cd2006-08-21 23:54:55 -070085 ipt->tcf_bindcnt--;
86 ipt->tcf_refcnt--;
87 if (ipt->tcf_bindcnt <= 0 && ipt->tcf_refcnt <= 0) {
88 ipt_destroy_target(ipt->tcfi_t);
89 kfree(ipt->tcfi_tname);
90 kfree(ipt->tcfi_t);
91 tcf_hash_destroy(&ipt->common, &ipt_hash_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 ret = ACT_P_DELETED;
93 }
94 }
95 return ret;
96}
97
Patrick McHardy53b2bf32008-01-23 20:36:30 -080098static const struct nla_policy ipt_policy[TCA_IPT_MAX + 1] = {
99 [TCA_IPT_TABLE] = { .type = NLA_STRING, .len = IFNAMSIZ },
100 [TCA_IPT_HOOK] = { .type = NLA_U32 },
101 [TCA_IPT_INDEX] = { .type = NLA_U32 },
Jan Engelhardt87a2e70d2010-10-13 16:11:22 +0200102 [TCA_IPT_TARG] = { .len = sizeof(struct xt_entry_target) },
Patrick McHardy53b2bf32008-01-23 20:36:30 -0800103};
104
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800105static int tcf_ipt_init(struct nlattr *nla, struct nlattr *est,
David S. Millere9ce1cd2006-08-21 23:54:55 -0700106 struct tc_action *a, int ovr, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107{
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800108 struct nlattr *tb[TCA_IPT_MAX + 1];
David S. Millere9ce1cd2006-08-21 23:54:55 -0700109 struct tcf_ipt *ipt;
110 struct tcf_common *pc;
Jan Engelhardt87a2e70d2010-10-13 16:11:22 +0200111 struct xt_entry_target *td, *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 char *tname;
113 int ret = 0, err;
114 u32 hook = 0;
115 u32 index = 0;
116
Patrick McHardycee63722008-01-23 20:33:32 -0800117 if (nla == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 return -EINVAL;
119
Patrick McHardy53b2bf32008-01-23 20:36:30 -0800120 err = nla_parse_nested(tb, TCA_IPT_MAX, nla, ipt_policy);
Patrick McHardycee63722008-01-23 20:33:32 -0800121 if (err < 0)
122 return err;
123
Patrick McHardy53b2bf32008-01-23 20:36:30 -0800124 if (tb[TCA_IPT_HOOK] == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 return -EINVAL;
Patrick McHardy53b2bf32008-01-23 20:36:30 -0800126 if (tb[TCA_IPT_TARG] == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 return -EINVAL;
Patrick McHardy53b2bf32008-01-23 20:36:30 -0800128
Jan Engelhardt87a2e70d2010-10-13 16:11:22 +0200129 td = (struct xt_entry_target *)nla_data(tb[TCA_IPT_TARG]);
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800130 if (nla_len(tb[TCA_IPT_TARG]) < td->u.target_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 return -EINVAL;
132
Patrick McHardy53b2bf32008-01-23 20:36:30 -0800133 if (tb[TCA_IPT_INDEX] != NULL)
Patrick McHardy1587bac2008-01-23 20:35:03 -0800134 index = nla_get_u32(tb[TCA_IPT_INDEX]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
David S. Millere9ce1cd2006-08-21 23:54:55 -0700136 pc = tcf_hash_check(index, a, bind, &ipt_hash_info);
137 if (!pc) {
138 pc = tcf_hash_create(index, est, a, sizeof(*ipt), bind,
139 &ipt_idx_gen, &ipt_hash_info);
Stephen Hemminger0e991ec2008-11-25 21:12:32 -0800140 if (IS_ERR(pc))
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000141 return PTR_ERR(pc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 ret = ACT_P_CREATED;
143 } else {
144 if (!ovr) {
David S. Millere9ce1cd2006-08-21 23:54:55 -0700145 tcf_ipt_release(to_ipt(pc), bind);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 return -EEXIST;
147 }
148 }
David S. Millere9ce1cd2006-08-21 23:54:55 -0700149 ipt = to_ipt(pc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
Patrick McHardy1587bac2008-01-23 20:35:03 -0800151 hook = nla_get_u32(tb[TCA_IPT_HOOK]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
153 err = -ENOMEM;
154 tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700155 if (unlikely(!tname))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 goto err1;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800157 if (tb[TCA_IPT_TABLE] == NULL ||
158 nla_strlcpy(tname, tb[TCA_IPT_TABLE], IFNAMSIZ) >= IFNAMSIZ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 strcpy(tname, "mangle");
160
Arnaldo Carvalho de Meloc7b1b242006-11-21 01:19:40 -0200161 t = kmemdup(td, td->u.target_size, GFP_KERNEL);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700162 if (unlikely(!t))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 goto err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000165 err = ipt_init_target(t, tname, hook);
166 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 goto err3;
168
David S. Millere9ce1cd2006-08-21 23:54:55 -0700169 spin_lock_bh(&ipt->tcf_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 if (ret != ACT_P_CREATED) {
David S. Millere9ce1cd2006-08-21 23:54:55 -0700171 ipt_destroy_target(ipt->tcfi_t);
172 kfree(ipt->tcfi_tname);
173 kfree(ipt->tcfi_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 }
David S. Millere9ce1cd2006-08-21 23:54:55 -0700175 ipt->tcfi_tname = tname;
176 ipt->tcfi_t = t;
177 ipt->tcfi_hook = hook;
178 spin_unlock_bh(&ipt->tcf_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 if (ret == ACT_P_CREATED)
David S. Millere9ce1cd2006-08-21 23:54:55 -0700180 tcf_hash_insert(pc, &ipt_hash_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 return ret;
182
183err3:
184 kfree(t);
185err2:
186 kfree(tname);
187err1:
Hiroaki SHIMODA47fd92f2012-08-06 05:45:48 +0000188 if (ret == ACT_P_CREATED) {
189 if (est)
190 gen_kill_estimator(&pc->tcfc_bstats,
191 &pc->tcfc_rate_est);
192 kfree_rcu(pc, tcfc_rcu);
193 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 return err;
195}
196
David S. Millere9ce1cd2006-08-21 23:54:55 -0700197static int tcf_ipt_cleanup(struct tc_action *a, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198{
David S. Millere9ce1cd2006-08-21 23:54:55 -0700199 struct tcf_ipt *ipt = a->priv;
200 return tcf_ipt_release(ipt, bind);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201}
202
Eric Dumazetdc7f9f62011-07-05 23:25:42 +0000203static int tcf_ipt(struct sk_buff *skb, const struct tc_action *a,
David S. Millere9ce1cd2006-08-21 23:54:55 -0700204 struct tcf_result *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205{
206 int ret = 0, result = 0;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700207 struct tcf_ipt *ipt = a->priv;
Jan Engelhardt4b560b42009-07-05 19:43:26 +0200208 struct xt_action_param par;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
210 if (skb_cloned(skb)) {
211 if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
212 return TC_ACT_UNSPEC;
213 }
214
David S. Millere9ce1cd2006-08-21 23:54:55 -0700215 spin_lock(&ipt->tcf_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
David S. Millere9ce1cd2006-08-21 23:54:55 -0700217 ipt->tcf_tm.lastuse = jiffies;
Eric Dumazetbfe0d022011-01-09 08:30:54 +0000218 bstats_update(&ipt->tcf_bstats, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
220 /* yes, we have to worry about both in and out dev
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000221 * worry later - danger - this API seems to have changed
222 * from earlier kernels
223 */
Jan Engelhardt7eb35582008-10-08 11:35:19 +0200224 par.in = skb->dev;
225 par.out = NULL;
226 par.hooknum = ipt->tcfi_hook;
227 par.target = ipt->tcfi_t->u.kernel.target;
228 par.targinfo = ipt->tcfi_t->data;
229 ret = par.target->target(skb, &par);
230
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 switch (ret) {
232 case NF_ACCEPT:
233 result = TC_ACT_OK;
234 break;
235 case NF_DROP:
236 result = TC_ACT_SHOT;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700237 ipt->tcf_qstats.drops++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 break;
Jan Engelhardt243bf6e2010-10-13 16:28:00 +0200239 case XT_CONTINUE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 result = TC_ACT_PIPE;
241 break;
242 default:
Joe Perchese87cc472012-05-13 21:56:26 +0000243 net_notice_ratelimited("tc filter: Bogus netfilter code %d assume ACCEPT\n",
244 ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 result = TC_POLICE_OK;
246 break;
247 }
David S. Millere9ce1cd2006-08-21 23:54:55 -0700248 spin_unlock(&ipt->tcf_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 return result;
250
251}
252
David S. Millere9ce1cd2006-08-21 23:54:55 -0700253static int tcf_ipt_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254{
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700255 unsigned char *b = skb_tail_pointer(skb);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700256 struct tcf_ipt *ipt = a->priv;
Jan Engelhardt87a2e70d2010-10-13 16:11:22 +0200257 struct xt_entry_target *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 struct tcf_t tm;
259 struct tc_cnt c;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260
261 /* for simple targets kernel size == user size
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000262 * user name = target name
263 * for foolproof you need to not assume this
264 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
Arnaldo Carvalho de Meloc7b1b242006-11-21 01:19:40 -0200266 t = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700267 if (unlikely(!t))
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800268 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269
David S. Millere9ce1cd2006-08-21 23:54:55 -0700270 c.bindcnt = ipt->tcf_bindcnt - bind;
271 c.refcnt = ipt->tcf_refcnt - ref;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700272 strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
David S. Miller1b34ec42012-03-29 05:11:39 -0400274 if (nla_put(skb, TCA_IPT_TARG, ipt->tcfi_t->u.user.target_size, t) ||
275 nla_put_u32(skb, TCA_IPT_INDEX, ipt->tcf_index) ||
276 nla_put_u32(skb, TCA_IPT_HOOK, ipt->tcfi_hook) ||
277 nla_put(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c) ||
278 nla_put_string(skb, TCA_IPT_TABLE, ipt->tcfi_tname))
279 goto nla_put_failure;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700280 tm.install = jiffies_to_clock_t(jiffies - ipt->tcf_tm.install);
281 tm.lastuse = jiffies_to_clock_t(jiffies - ipt->tcf_tm.lastuse);
282 tm.expires = jiffies_to_clock_t(ipt->tcf_tm.expires);
David S. Miller1b34ec42012-03-29 05:11:39 -0400283 if (nla_put(skb, TCA_IPT_TM, sizeof (tm), &tm))
284 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 kfree(t);
286 return skb->len;
287
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800288nla_put_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -0700289 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 kfree(t);
291 return -1;
292}
293
294static struct tc_action_ops act_ipt_ops = {
295 .kind = "ipt",
David S. Millere9ce1cd2006-08-21 23:54:55 -0700296 .hinfo = &ipt_hash_info,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 .type = TCA_ACT_IPT,
298 .capab = TCA_CAP_NONE,
299 .owner = THIS_MODULE,
300 .act = tcf_ipt,
301 .dump = tcf_ipt_dump,
302 .cleanup = tcf_ipt_cleanup,
303 .lookup = tcf_hash_search,
304 .init = tcf_ipt_init,
305 .walk = tcf_generic_walker
306};
307
308MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
309MODULE_DESCRIPTION("Iptables target actions");
310MODULE_LICENSE("GPL");
311
David S. Millere9ce1cd2006-08-21 23:54:55 -0700312static int __init ipt_init_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313{
314 return tcf_register_action(&act_ipt_ops);
315}
316
David S. Millere9ce1cd2006-08-21 23:54:55 -0700317static void __exit ipt_cleanup_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318{
319 tcf_unregister_action(&act_ipt_ops);
320}
321
322module_init(ipt_init_module);
323module_exit(ipt_cleanup_module);