blob: 12693347d56a871c85ac019d95c6cbd821dd0464 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * net/sched/ipt.c iptables target interface
3 *
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>
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -070022#include <net/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <net/pkt_sched.h>
24#include <linux/tc_act/tc_ipt.h>
25#include <net/tc_act/tc_ipt.h>
26
27#include <linux/netfilter_ipv4/ip_tables.h>
28
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
David S. Millere9ce1cd2006-08-21 23:54:55 -070030#define IPT_TAB_MASK 15
31static struct tcf_common *tcf_ipt_ht[IPT_TAB_MASK + 1];
32static u32 ipt_idx_gen;
Linus Torvalds1da177e2005-04-16 15:20:36 -070033static DEFINE_RWLOCK(ipt_lock);
34
David S. Millere9ce1cd2006-08-21 23:54:55 -070035static struct tcf_hashinfo ipt_hash_info = {
36 .htab = tcf_ipt_ht,
37 .hmask = IPT_TAB_MASK,
38 .lock = &ipt_lock,
39};
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
David S. Millere9ce1cd2006-08-21 23:54:55 -070041static int ipt_init_target(struct ipt_entry_target *t, char *table, unsigned int hook)
Linus Torvalds1da177e2005-04-16 15:20:36 -070042{
Jan Engelhardte60a13e2007-02-07 15:12:33 -080043 struct xt_target *target;
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 int ret = 0;
45
Patrick McHardy239a87c2007-02-02 00:40:36 -080046 target = xt_request_find_target(AF_INET, t->u.user.name,
47 t->u.user.revision);
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 if (!target)
49 return -ENOENT;
50
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 t->u.kernel.target = target;
52
Patrick McHardy18118cd2006-04-24 17:18:59 -070053 ret = xt_check_target(target, AF_INET, t->u.target_size - sizeof(*t),
54 table, hook, 0, 0);
Patrick McHardy239a87c2007-02-02 00:40:36 -080055 if (ret) {
56 module_put(t->u.kernel.target->me);
Patrick McHardy18118cd2006-04-24 17:18:59 -070057 return ret;
Patrick McHardy239a87c2007-02-02 00:40:36 -080058 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 if (t->u.kernel.target->checkentry
Patrick McHardy1c524832006-03-20 18:02:15 -080060 && !t->u.kernel.target->checkentry(table, NULL,
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +090061 t->u.kernel.target, t->data,
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 hook)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 module_put(t->u.kernel.target->me);
64 ret = -EINVAL;
65 }
66
67 return ret;
68}
69
David S. Millere9ce1cd2006-08-21 23:54:55 -070070static void ipt_destroy_target(struct ipt_entry_target *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071{
72 if (t->u.kernel.target->destroy)
Patrick McHardyefa74162006-08-22 00:36:37 -070073 t->u.kernel.target->destroy(t->u.kernel.target, t->data);
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +090074 module_put(t->u.kernel.target->me);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075}
76
David S. Millere9ce1cd2006-08-21 23:54:55 -070077static int tcf_ipt_release(struct tcf_ipt *ipt, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -070078{
79 int ret = 0;
David S. Millere9ce1cd2006-08-21 23:54:55 -070080 if (ipt) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 if (bind)
David S. Millere9ce1cd2006-08-21 23:54:55 -070082 ipt->tcf_bindcnt--;
83 ipt->tcf_refcnt--;
84 if (ipt->tcf_bindcnt <= 0 && ipt->tcf_refcnt <= 0) {
85 ipt_destroy_target(ipt->tcfi_t);
86 kfree(ipt->tcfi_tname);
87 kfree(ipt->tcfi_t);
88 tcf_hash_destroy(&ipt->common, &ipt_hash_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 ret = ACT_P_DELETED;
90 }
91 }
92 return ret;
93}
94
Patrick McHardy7ba699c2008-01-22 22:11:50 -080095static int tcf_ipt_init(struct nlattr *nla, struct nlattr *est,
David S. Millere9ce1cd2006-08-21 23:54:55 -070096 struct tc_action *a, int ovr, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -070097{
Patrick McHardy7ba699c2008-01-22 22:11:50 -080098 struct nlattr *tb[TCA_IPT_MAX + 1];
David S. Millere9ce1cd2006-08-21 23:54:55 -070099 struct tcf_ipt *ipt;
100 struct tcf_common *pc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 struct ipt_entry_target *td, *t;
102 char *tname;
103 int ret = 0, err;
104 u32 hook = 0;
105 u32 index = 0;
106
Patrick McHardycee63722008-01-23 20:33:32 -0800107 if (nla == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 return -EINVAL;
109
Patrick McHardycee63722008-01-23 20:33:32 -0800110 err = nla_parse_nested(tb, TCA_IPT_MAX, nla, NULL);
111 if (err < 0)
112 return err;
113
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800114 if (tb[TCA_IPT_HOOK] == NULL ||
115 nla_len(tb[TCA_IPT_HOOK]) < sizeof(u32))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 return -EINVAL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800117 if (tb[TCA_IPT_TARG] == NULL ||
118 nla_len(tb[TCA_IPT_TARG]) < sizeof(*t))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 return -EINVAL;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800120 td = (struct ipt_entry_target *)nla_data(tb[TCA_IPT_TARG]);
121 if (nla_len(tb[TCA_IPT_TARG]) < td->u.target_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 return -EINVAL;
123
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800124 if (tb[TCA_IPT_INDEX] != NULL &&
125 nla_len(tb[TCA_IPT_INDEX]) >= sizeof(u32))
126 index = *(u32 *)nla_data(tb[TCA_IPT_INDEX]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
David S. Millere9ce1cd2006-08-21 23:54:55 -0700128 pc = tcf_hash_check(index, a, bind, &ipt_hash_info);
129 if (!pc) {
130 pc = tcf_hash_create(index, est, a, sizeof(*ipt), bind,
131 &ipt_idx_gen, &ipt_hash_info);
132 if (unlikely(!pc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 return -ENOMEM;
134 ret = ACT_P_CREATED;
135 } else {
136 if (!ovr) {
David S. Millere9ce1cd2006-08-21 23:54:55 -0700137 tcf_ipt_release(to_ipt(pc), bind);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 return -EEXIST;
139 }
140 }
David S. Millere9ce1cd2006-08-21 23:54:55 -0700141 ipt = to_ipt(pc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800143 hook = *(u32 *)nla_data(tb[TCA_IPT_HOOK]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
145 err = -ENOMEM;
146 tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700147 if (unlikely(!tname))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 goto err1;
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800149 if (tb[TCA_IPT_TABLE] == NULL ||
150 nla_strlcpy(tname, tb[TCA_IPT_TABLE], IFNAMSIZ) >= IFNAMSIZ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 strcpy(tname, "mangle");
152
Arnaldo Carvalho de Meloc7b1b242006-11-21 01:19:40 -0200153 t = kmemdup(td, td->u.target_size, GFP_KERNEL);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700154 if (unlikely(!t))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 goto err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156
157 if ((err = ipt_init_target(t, tname, hook)) < 0)
158 goto err3;
159
David S. Millere9ce1cd2006-08-21 23:54:55 -0700160 spin_lock_bh(&ipt->tcf_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 if (ret != ACT_P_CREATED) {
David S. Millere9ce1cd2006-08-21 23:54:55 -0700162 ipt_destroy_target(ipt->tcfi_t);
163 kfree(ipt->tcfi_tname);
164 kfree(ipt->tcfi_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 }
David S. Millere9ce1cd2006-08-21 23:54:55 -0700166 ipt->tcfi_tname = tname;
167 ipt->tcfi_t = t;
168 ipt->tcfi_hook = hook;
169 spin_unlock_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 tcf_hash_insert(pc, &ipt_hash_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 return ret;
173
174err3:
175 kfree(t);
176err2:
177 kfree(tname);
178err1:
David S. Millere9ce1cd2006-08-21 23:54:55 -0700179 kfree(pc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 return err;
181}
182
David S. Millere9ce1cd2006-08-21 23:54:55 -0700183static int tcf_ipt_cleanup(struct tc_action *a, int bind)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184{
David S. Millere9ce1cd2006-08-21 23:54:55 -0700185 struct tcf_ipt *ipt = a->priv;
186 return tcf_ipt_release(ipt, bind);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187}
188
David S. Millere9ce1cd2006-08-21 23:54:55 -0700189static int tcf_ipt(struct sk_buff *skb, struct tc_action *a,
190 struct tcf_result *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191{
192 int ret = 0, result = 0;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700193 struct tcf_ipt *ipt = a->priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
195 if (skb_cloned(skb)) {
196 if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
197 return TC_ACT_UNSPEC;
198 }
199
David S. Millere9ce1cd2006-08-21 23:54:55 -0700200 spin_lock(&ipt->tcf_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
David S. Millere9ce1cd2006-08-21 23:54:55 -0700202 ipt->tcf_tm.lastuse = jiffies;
203 ipt->tcf_bstats.bytes += skb->len;
204 ipt->tcf_bstats.packets++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
206 /* yes, we have to worry about both in and out dev
207 worry later - danger - this API seems to have changed
208 from earlier kernels */
Herbert Xu3db05fe2007-10-15 00:53:15 -0700209 ret = ipt->tcfi_t->u.kernel.target->target(skb, skb->dev, NULL,
David S. Millere9ce1cd2006-08-21 23:54:55 -0700210 ipt->tcfi_hook,
211 ipt->tcfi_t->u.kernel.target,
Patrick McHardyfe1cb102006-08-22 00:35:47 -0700212 ipt->tcfi_t->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 switch (ret) {
214 case NF_ACCEPT:
215 result = TC_ACT_OK;
216 break;
217 case NF_DROP:
218 result = TC_ACT_SHOT;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700219 ipt->tcf_qstats.drops++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 break;
221 case IPT_CONTINUE:
222 result = TC_ACT_PIPE;
223 break;
224 default:
225 if (net_ratelimit())
226 printk("Bogus netfilter code %d assume ACCEPT\n", ret);
227 result = TC_POLICE_OK;
228 break;
229 }
David S. Millere9ce1cd2006-08-21 23:54:55 -0700230 spin_unlock(&ipt->tcf_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 return result;
232
233}
234
David S. Millere9ce1cd2006-08-21 23:54:55 -0700235static int tcf_ipt_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236{
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700237 unsigned char *b = skb_tail_pointer(skb);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700238 struct tcf_ipt *ipt = a->priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 struct ipt_entry_target *t;
240 struct tcf_t tm;
241 struct tc_cnt c;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242
243 /* for simple targets kernel size == user size
244 ** user name = target name
245 ** for foolproof you need to not assume this
246 */
247
Arnaldo Carvalho de Meloc7b1b242006-11-21 01:19:40 -0200248 t = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700249 if (unlikely(!t))
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800250 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
David S. Millere9ce1cd2006-08-21 23:54:55 -0700252 c.bindcnt = ipt->tcf_bindcnt - bind;
253 c.refcnt = ipt->tcf_refcnt - ref;
David S. Millere9ce1cd2006-08-21 23:54:55 -0700254 strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800256 NLA_PUT(skb, TCA_IPT_TARG, ipt->tcfi_t->u.user.target_size, t);
257 NLA_PUT(skb, TCA_IPT_INDEX, 4, &ipt->tcf_index);
258 NLA_PUT(skb, TCA_IPT_HOOK, 4, &ipt->tcfi_hook);
259 NLA_PUT(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c);
260 NLA_PUT(skb, TCA_IPT_TABLE, IFNAMSIZ, ipt->tcfi_tname);
David S. Millere9ce1cd2006-08-21 23:54:55 -0700261 tm.install = jiffies_to_clock_t(jiffies - ipt->tcf_tm.install);
262 tm.lastuse = jiffies_to_clock_t(jiffies - ipt->tcf_tm.lastuse);
263 tm.expires = jiffies_to_clock_t(ipt->tcf_tm.expires);
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800264 NLA_PUT(skb, TCA_IPT_TM, sizeof (tm), &tm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 kfree(t);
266 return skb->len;
267
Patrick McHardy7ba699c2008-01-22 22:11:50 -0800268nla_put_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -0700269 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 kfree(t);
271 return -1;
272}
273
274static struct tc_action_ops act_ipt_ops = {
275 .kind = "ipt",
David S. Millere9ce1cd2006-08-21 23:54:55 -0700276 .hinfo = &ipt_hash_info,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 .type = TCA_ACT_IPT,
278 .capab = TCA_CAP_NONE,
279 .owner = THIS_MODULE,
280 .act = tcf_ipt,
281 .dump = tcf_ipt_dump,
282 .cleanup = tcf_ipt_cleanup,
283 .lookup = tcf_hash_search,
284 .init = tcf_ipt_init,
285 .walk = tcf_generic_walker
286};
287
288MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
289MODULE_DESCRIPTION("Iptables target actions");
290MODULE_LICENSE("GPL");
291
David S. Millere9ce1cd2006-08-21 23:54:55 -0700292static int __init ipt_init_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293{
294 return tcf_register_action(&act_ipt_ops);
295}
296
David S. Millere9ce1cd2006-08-21 23:54:55 -0700297static void __exit ipt_cleanup_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298{
299 tcf_unregister_action(&act_ipt_ops);
300}
301
302module_init(ipt_init_module);
303module_exit(ipt_cleanup_module);