[PKT_SCHED]: Kill pkt_act.h inlining.
[linux-2.6/x86.git] / net / sched / act_ipt.c
blob224c078a398e77872418721cc206a6c01035ef9e
1 /*
2 * net/sched/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 (2002-4)
14 #include <asm/uaccess.h>
15 #include <asm/system.h>
16 #include <asm/bitops.h>
17 #include <linux/types.h>
18 #include <linux/kernel.h>
19 #include <linux/sched.h>
20 #include <linux/string.h>
21 #include <linux/mm.h>
22 #include <linux/socket.h>
23 #include <linux/sockios.h>
24 #include <linux/in.h>
25 #include <linux/errno.h>
26 #include <linux/interrupt.h>
27 #include <linux/netdevice.h>
28 #include <linux/skbuff.h>
29 #include <linux/rtnetlink.h>
30 #include <linux/module.h>
31 #include <linux/init.h>
32 #include <linux/proc_fs.h>
33 #include <linux/kmod.h>
34 #include <net/sock.h>
35 #include <net/pkt_sched.h>
36 #include <linux/tc_act/tc_ipt.h>
37 #include <net/tc_act/tc_ipt.h>
39 #include <linux/netfilter_ipv4/ip_tables.h>
42 #define IPT_TAB_MASK 15
43 static struct tcf_common *tcf_ipt_ht[IPT_TAB_MASK + 1];
44 static u32 ipt_idx_gen;
45 static DEFINE_RWLOCK(ipt_lock);
47 static struct tcf_hashinfo ipt_hash_info = {
48 .htab = tcf_ipt_ht,
49 .hmask = IPT_TAB_MASK,
50 .lock = &ipt_lock,
53 static int ipt_init_target(struct ipt_entry_target *t, char *table, unsigned int hook)
55 struct ipt_target *target;
56 int ret = 0;
58 target = xt_find_target(AF_INET, t->u.user.name, t->u.user.revision);
59 if (!target)
60 return -ENOENT;
62 t->u.kernel.target = target;
64 ret = xt_check_target(target, AF_INET, t->u.target_size - sizeof(*t),
65 table, hook, 0, 0);
66 if (ret)
67 return ret;
69 if (t->u.kernel.target->checkentry
70 && !t->u.kernel.target->checkentry(table, NULL,
71 t->u.kernel.target, t->data,
72 t->u.target_size - sizeof(*t),
73 hook)) {
74 module_put(t->u.kernel.target->me);
75 ret = -EINVAL;
78 return ret;
81 static void ipt_destroy_target(struct ipt_entry_target *t)
83 if (t->u.kernel.target->destroy)
84 t->u.kernel.target->destroy(t->u.kernel.target, t->data,
85 t->u.target_size - sizeof(*t));
86 module_put(t->u.kernel.target->me);
89 static int tcf_ipt_release(struct tcf_ipt *ipt, int bind)
91 int ret = 0;
92 if (ipt) {
93 if (bind)
94 ipt->tcf_bindcnt--;
95 ipt->tcf_refcnt--;
96 if (ipt->tcf_bindcnt <= 0 && ipt->tcf_refcnt <= 0) {
97 ipt_destroy_target(ipt->tcfi_t);
98 kfree(ipt->tcfi_tname);
99 kfree(ipt->tcfi_t);
100 tcf_hash_destroy(&ipt->common, &ipt_hash_info);
101 ret = ACT_P_DELETED;
104 return ret;
107 static int tcf_ipt_init(struct rtattr *rta, struct rtattr *est,
108 struct tc_action *a, int ovr, int bind)
110 struct rtattr *tb[TCA_IPT_MAX];
111 struct tcf_ipt *ipt;
112 struct tcf_common *pc;
113 struct ipt_entry_target *td, *t;
114 char *tname;
115 int ret = 0, err;
116 u32 hook = 0;
117 u32 index = 0;
119 if (rta == NULL || rtattr_parse_nested(tb, TCA_IPT_MAX, rta) < 0)
120 return -EINVAL;
122 if (tb[TCA_IPT_HOOK-1] == NULL ||
123 RTA_PAYLOAD(tb[TCA_IPT_HOOK-1]) < sizeof(u32))
124 return -EINVAL;
125 if (tb[TCA_IPT_TARG-1] == NULL ||
126 RTA_PAYLOAD(tb[TCA_IPT_TARG-1]) < sizeof(*t))
127 return -EINVAL;
128 td = (struct ipt_entry_target *)RTA_DATA(tb[TCA_IPT_TARG-1]);
129 if (RTA_PAYLOAD(tb[TCA_IPT_TARG-1]) < td->u.target_size)
130 return -EINVAL;
132 if (tb[TCA_IPT_INDEX-1] != NULL &&
133 RTA_PAYLOAD(tb[TCA_IPT_INDEX-1]) >= sizeof(u32))
134 index = *(u32 *)RTA_DATA(tb[TCA_IPT_INDEX-1]);
136 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);
140 if (unlikely(!pc))
141 return -ENOMEM;
142 ret = ACT_P_CREATED;
143 } else {
144 if (!ovr) {
145 tcf_ipt_release(to_ipt(pc), bind);
146 return -EEXIST;
149 ipt = to_ipt(pc);
151 hook = *(u32 *)RTA_DATA(tb[TCA_IPT_HOOK-1]);
153 err = -ENOMEM;
154 tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
155 if (unlikely(!tname))
156 goto err1;
157 if (tb[TCA_IPT_TABLE - 1] == NULL ||
158 rtattr_strlcpy(tname, tb[TCA_IPT_TABLE-1], IFNAMSIZ) >= IFNAMSIZ)
159 strcpy(tname, "mangle");
161 t = kmalloc(td->u.target_size, GFP_KERNEL);
162 if (unlikely(!t))
163 goto err2;
164 memcpy(t, td, td->u.target_size);
166 if ((err = ipt_init_target(t, tname, hook)) < 0)
167 goto err3;
169 spin_lock_bh(&ipt->tcf_lock);
170 if (ret != ACT_P_CREATED) {
171 ipt_destroy_target(ipt->tcfi_t);
172 kfree(ipt->tcfi_tname);
173 kfree(ipt->tcfi_t);
175 ipt->tcfi_tname = tname;
176 ipt->tcfi_t = t;
177 ipt->tcfi_hook = hook;
178 spin_unlock_bh(&ipt->tcf_lock);
179 if (ret == ACT_P_CREATED)
180 tcf_hash_insert(pc, &ipt_hash_info);
181 return ret;
183 err3:
184 kfree(t);
185 err2:
186 kfree(tname);
187 err1:
188 kfree(pc);
189 return err;
192 static int tcf_ipt_cleanup(struct tc_action *a, int bind)
194 struct tcf_ipt *ipt = a->priv;
195 return tcf_ipt_release(ipt, bind);
198 static int tcf_ipt(struct sk_buff *skb, struct tc_action *a,
199 struct tcf_result *res)
201 int ret = 0, result = 0;
202 struct tcf_ipt *ipt = a->priv;
204 if (skb_cloned(skb)) {
205 if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
206 return TC_ACT_UNSPEC;
209 spin_lock(&ipt->tcf_lock);
211 ipt->tcf_tm.lastuse = jiffies;
212 ipt->tcf_bstats.bytes += skb->len;
213 ipt->tcf_bstats.packets++;
215 /* yes, we have to worry about both in and out dev
216 worry later - danger - this API seems to have changed
217 from earlier kernels */
219 /* iptables targets take a double skb pointer in case the skb
220 * needs to be replaced. We don't own the skb, so this must not
221 * happen. The pskb_expand_head above should make sure of this */
222 ret = ipt->tcfi_t->u.kernel.target->target(&skb, skb->dev, NULL,
223 ipt->tcfi_hook,
224 ipt->tcfi_t->u.kernel.target,
225 ipt->tcfi_t->data, NULL);
226 switch (ret) {
227 case NF_ACCEPT:
228 result = TC_ACT_OK;
229 break;
230 case NF_DROP:
231 result = TC_ACT_SHOT;
232 ipt->tcf_qstats.drops++;
233 break;
234 case IPT_CONTINUE:
235 result = TC_ACT_PIPE;
236 break;
237 default:
238 if (net_ratelimit())
239 printk("Bogus netfilter code %d assume ACCEPT\n", ret);
240 result = TC_POLICE_OK;
241 break;
243 spin_unlock(&ipt->tcf_lock);
244 return result;
248 static int tcf_ipt_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
250 unsigned char *b = skb->tail;
251 struct tcf_ipt *ipt = a->priv;
252 struct ipt_entry_target *t;
253 struct tcf_t tm;
254 struct tc_cnt c;
256 /* for simple targets kernel size == user size
257 ** user name = target name
258 ** for foolproof you need to not assume this
261 t = kmalloc(ipt->tcfi_t->u.user.target_size, GFP_ATOMIC);
262 if (unlikely(!t))
263 goto rtattr_failure;
265 c.bindcnt = ipt->tcf_bindcnt - bind;
266 c.refcnt = ipt->tcf_refcnt - ref;
267 memcpy(t, ipt->tcfi_t, ipt->tcfi_t->u.user.target_size);
268 strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name);
270 RTA_PUT(skb, TCA_IPT_TARG, ipt->tcfi_t->u.user.target_size, t);
271 RTA_PUT(skb, TCA_IPT_INDEX, 4, &ipt->tcf_index);
272 RTA_PUT(skb, TCA_IPT_HOOK, 4, &ipt->tcfi_hook);
273 RTA_PUT(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c);
274 RTA_PUT(skb, TCA_IPT_TABLE, IFNAMSIZ, ipt->tcfi_tname);
275 tm.install = jiffies_to_clock_t(jiffies - ipt->tcf_tm.install);
276 tm.lastuse = jiffies_to_clock_t(jiffies - ipt->tcf_tm.lastuse);
277 tm.expires = jiffies_to_clock_t(ipt->tcf_tm.expires);
278 RTA_PUT(skb, TCA_IPT_TM, sizeof (tm), &tm);
279 kfree(t);
280 return skb->len;
282 rtattr_failure:
283 skb_trim(skb, b - skb->data);
284 kfree(t);
285 return -1;
288 static struct tc_action_ops act_ipt_ops = {
289 .kind = "ipt",
290 .hinfo = &ipt_hash_info,
291 .type = TCA_ACT_IPT,
292 .capab = TCA_CAP_NONE,
293 .owner = THIS_MODULE,
294 .act = tcf_ipt,
295 .dump = tcf_ipt_dump,
296 .cleanup = tcf_ipt_cleanup,
297 .lookup = tcf_hash_search,
298 .init = tcf_ipt_init,
299 .walk = tcf_generic_walker
302 MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
303 MODULE_DESCRIPTION("Iptables target actions");
304 MODULE_LICENSE("GPL");
306 static int __init ipt_init_module(void)
308 return tcf_register_action(&act_ipt_ops);
311 static void __exit ipt_cleanup_module(void)
313 tcf_unregister_action(&act_ipt_ops);
316 module_init(ipt_init_module);
317 module_exit(ipt_cleanup_module);