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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
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 | ||
1da177e4 LT |
14 | #include <linux/types.h> |
15 | #include <linux/kernel.h> | |
1da177e4 | 16 | #include <linux/string.h> |
1da177e4 | 17 | #include <linux/errno.h> |
1da177e4 LT |
18 | #include <linux/skbuff.h> |
19 | #include <linux/rtnetlink.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/init.h> | |
dc5fc579 | 22 | #include <net/netlink.h> |
1da177e4 LT |
23 | #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 | ||
1da177e4 | 29 | |
e9ce1cd3 DM |
30 | #define IPT_TAB_MASK 15 |
31 | static struct tcf_common *tcf_ipt_ht[IPT_TAB_MASK + 1]; | |
32 | static u32 ipt_idx_gen; | |
1da177e4 LT |
33 | static DEFINE_RWLOCK(ipt_lock); |
34 | ||
e9ce1cd3 DM |
35 | static struct tcf_hashinfo ipt_hash_info = { |
36 | .htab = tcf_ipt_ht, | |
37 | .hmask = IPT_TAB_MASK, | |
38 | .lock = &ipt_lock, | |
39 | }; | |
1da177e4 | 40 | |
e9ce1cd3 | 41 | static int ipt_init_target(struct ipt_entry_target *t, char *table, unsigned int hook) |
1da177e4 | 42 | { |
e60a13e0 | 43 | struct xt_target *target; |
1da177e4 LT |
44 | int ret = 0; |
45 | ||
239a87c8 PM |
46 | target = xt_request_find_target(AF_INET, t->u.user.name, |
47 | t->u.user.revision); | |
1da177e4 LT |
48 | if (!target) |
49 | return -ENOENT; | |
50 | ||
1da177e4 LT |
51 | t->u.kernel.target = target; |
52 | ||
18118cdb | 53 | ret = xt_check_target(target, AF_INET, t->u.target_size - sizeof(*t), |
367c6790 JE |
54 | table, hook, 0, 0, NULL, t->data); |
55 | if (ret < 0) { | |
239a87c8 | 56 | module_put(t->u.kernel.target->me); |
18118cdb | 57 | return ret; |
239a87c8 | 58 | } |
367c6790 | 59 | return 0; |
1da177e4 LT |
60 | } |
61 | ||
e9ce1cd3 | 62 | static void ipt_destroy_target(struct ipt_entry_target *t) |
1da177e4 LT |
63 | { |
64 | if (t->u.kernel.target->destroy) | |
efa74165 | 65 | t->u.kernel.target->destroy(t->u.kernel.target, t->data); |
10297b99 | 66 | module_put(t->u.kernel.target->me); |
1da177e4 LT |
67 | } |
68 | ||
e9ce1cd3 | 69 | static int tcf_ipt_release(struct tcf_ipt *ipt, int bind) |
1da177e4 LT |
70 | { |
71 | int ret = 0; | |
e9ce1cd3 | 72 | if (ipt) { |
1da177e4 | 73 | if (bind) |
e9ce1cd3 DM |
74 | ipt->tcf_bindcnt--; |
75 | ipt->tcf_refcnt--; | |
76 | if (ipt->tcf_bindcnt <= 0 && ipt->tcf_refcnt <= 0) { | |
77 | ipt_destroy_target(ipt->tcfi_t); | |
78 | kfree(ipt->tcfi_tname); | |
79 | kfree(ipt->tcfi_t); | |
80 | tcf_hash_destroy(&ipt->common, &ipt_hash_info); | |
1da177e4 LT |
81 | ret = ACT_P_DELETED; |
82 | } | |
83 | } | |
84 | return ret; | |
85 | } | |
86 | ||
53b2bf3f PM |
87 | static const struct nla_policy ipt_policy[TCA_IPT_MAX + 1] = { |
88 | [TCA_IPT_TABLE] = { .type = NLA_STRING, .len = IFNAMSIZ }, | |
89 | [TCA_IPT_HOOK] = { .type = NLA_U32 }, | |
90 | [TCA_IPT_INDEX] = { .type = NLA_U32 }, | |
91 | [TCA_IPT_TARG] = { .len = sizeof(struct ipt_entry_target) }, | |
92 | }; | |
93 | ||
7ba699c6 | 94 | static int tcf_ipt_init(struct nlattr *nla, struct nlattr *est, |
e9ce1cd3 | 95 | struct tc_action *a, int ovr, int bind) |
1da177e4 | 96 | { |
7ba699c6 | 97 | struct nlattr *tb[TCA_IPT_MAX + 1]; |
e9ce1cd3 DM |
98 | struct tcf_ipt *ipt; |
99 | struct tcf_common *pc; | |
1da177e4 LT |
100 | struct ipt_entry_target *td, *t; |
101 | char *tname; | |
102 | int ret = 0, err; | |
103 | u32 hook = 0; | |
104 | u32 index = 0; | |
105 | ||
cee63723 | 106 | if (nla == NULL) |
1da177e4 LT |
107 | return -EINVAL; |
108 | ||
53b2bf3f | 109 | err = nla_parse_nested(tb, TCA_IPT_MAX, nla, ipt_policy); |
cee63723 PM |
110 | if (err < 0) |
111 | return err; | |
112 | ||
53b2bf3f | 113 | if (tb[TCA_IPT_HOOK] == NULL) |
1da177e4 | 114 | return -EINVAL; |
53b2bf3f | 115 | if (tb[TCA_IPT_TARG] == NULL) |
1da177e4 | 116 | return -EINVAL; |
53b2bf3f | 117 | |
7ba699c6 PM |
118 | td = (struct ipt_entry_target *)nla_data(tb[TCA_IPT_TARG]); |
119 | if (nla_len(tb[TCA_IPT_TARG]) < td->u.target_size) | |
1da177e4 LT |
120 | return -EINVAL; |
121 | ||
53b2bf3f | 122 | if (tb[TCA_IPT_INDEX] != NULL) |
1587bac4 | 123 | index = nla_get_u32(tb[TCA_IPT_INDEX]); |
1da177e4 | 124 | |
e9ce1cd3 DM |
125 | pc = tcf_hash_check(index, a, bind, &ipt_hash_info); |
126 | if (!pc) { | |
127 | pc = tcf_hash_create(index, est, a, sizeof(*ipt), bind, | |
128 | &ipt_idx_gen, &ipt_hash_info); | |
129 | if (unlikely(!pc)) | |
1da177e4 LT |
130 | return -ENOMEM; |
131 | ret = ACT_P_CREATED; | |
132 | } else { | |
133 | if (!ovr) { | |
e9ce1cd3 | 134 | tcf_ipt_release(to_ipt(pc), bind); |
1da177e4 LT |
135 | return -EEXIST; |
136 | } | |
137 | } | |
e9ce1cd3 | 138 | ipt = to_ipt(pc); |
1da177e4 | 139 | |
1587bac4 | 140 | hook = nla_get_u32(tb[TCA_IPT_HOOK]); |
1da177e4 LT |
141 | |
142 | err = -ENOMEM; | |
143 | tname = kmalloc(IFNAMSIZ, GFP_KERNEL); | |
e9ce1cd3 | 144 | if (unlikely(!tname)) |
1da177e4 | 145 | goto err1; |
7ba699c6 PM |
146 | if (tb[TCA_IPT_TABLE] == NULL || |
147 | nla_strlcpy(tname, tb[TCA_IPT_TABLE], IFNAMSIZ) >= IFNAMSIZ) | |
1da177e4 LT |
148 | strcpy(tname, "mangle"); |
149 | ||
c7b1b249 | 150 | t = kmemdup(td, td->u.target_size, GFP_KERNEL); |
e9ce1cd3 | 151 | if (unlikely(!t)) |
1da177e4 | 152 | goto err2; |
1da177e4 LT |
153 | |
154 | if ((err = ipt_init_target(t, tname, hook)) < 0) | |
155 | goto err3; | |
156 | ||
e9ce1cd3 | 157 | spin_lock_bh(&ipt->tcf_lock); |
1da177e4 | 158 | if (ret != ACT_P_CREATED) { |
e9ce1cd3 DM |
159 | ipt_destroy_target(ipt->tcfi_t); |
160 | kfree(ipt->tcfi_tname); | |
161 | kfree(ipt->tcfi_t); | |
1da177e4 | 162 | } |
e9ce1cd3 DM |
163 | ipt->tcfi_tname = tname; |
164 | ipt->tcfi_t = t; | |
165 | ipt->tcfi_hook = hook; | |
166 | spin_unlock_bh(&ipt->tcf_lock); | |
1da177e4 | 167 | if (ret == ACT_P_CREATED) |
e9ce1cd3 | 168 | tcf_hash_insert(pc, &ipt_hash_info); |
1da177e4 LT |
169 | return ret; |
170 | ||
171 | err3: | |
172 | kfree(t); | |
173 | err2: | |
174 | kfree(tname); | |
175 | err1: | |
e9ce1cd3 | 176 | kfree(pc); |
1da177e4 LT |
177 | return err; |
178 | } | |
179 | ||
e9ce1cd3 | 180 | static int tcf_ipt_cleanup(struct tc_action *a, int bind) |
1da177e4 | 181 | { |
e9ce1cd3 DM |
182 | struct tcf_ipt *ipt = a->priv; |
183 | return tcf_ipt_release(ipt, bind); | |
1da177e4 LT |
184 | } |
185 | ||
e9ce1cd3 DM |
186 | static int tcf_ipt(struct sk_buff *skb, struct tc_action *a, |
187 | struct tcf_result *res) | |
1da177e4 LT |
188 | { |
189 | int ret = 0, result = 0; | |
e9ce1cd3 | 190 | struct tcf_ipt *ipt = a->priv; |
7eb35586 | 191 | struct xt_target_param par; |
1da177e4 LT |
192 | |
193 | if (skb_cloned(skb)) { | |
194 | if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) | |
195 | return TC_ACT_UNSPEC; | |
196 | } | |
197 | ||
e9ce1cd3 | 198 | spin_lock(&ipt->tcf_lock); |
1da177e4 | 199 | |
e9ce1cd3 | 200 | ipt->tcf_tm.lastuse = jiffies; |
0abf77e5 | 201 | ipt->tcf_bstats.bytes += qdisc_pkt_len(skb); |
e9ce1cd3 | 202 | ipt->tcf_bstats.packets++; |
1da177e4 LT |
203 | |
204 | /* yes, we have to worry about both in and out dev | |
205 | worry later - danger - this API seems to have changed | |
206 | from earlier kernels */ | |
7eb35586 JE |
207 | par.in = skb->dev; |
208 | par.out = NULL; | |
209 | par.hooknum = ipt->tcfi_hook; | |
210 | par.target = ipt->tcfi_t->u.kernel.target; | |
211 | par.targinfo = ipt->tcfi_t->data; | |
212 | ret = par.target->target(skb, &par); | |
213 | ||
1da177e4 LT |
214 | switch (ret) { |
215 | case NF_ACCEPT: | |
216 | result = TC_ACT_OK; | |
217 | break; | |
218 | case NF_DROP: | |
219 | result = TC_ACT_SHOT; | |
e9ce1cd3 | 220 | ipt->tcf_qstats.drops++; |
1da177e4 LT |
221 | break; |
222 | case IPT_CONTINUE: | |
223 | result = TC_ACT_PIPE; | |
224 | break; | |
225 | default: | |
226 | if (net_ratelimit()) | |
227 | printk("Bogus netfilter code %d assume ACCEPT\n", ret); | |
228 | result = TC_POLICE_OK; | |
229 | break; | |
230 | } | |
e9ce1cd3 | 231 | spin_unlock(&ipt->tcf_lock); |
1da177e4 LT |
232 | return result; |
233 | ||
234 | } | |
235 | ||
e9ce1cd3 | 236 | static int tcf_ipt_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref) |
1da177e4 | 237 | { |
27a884dc | 238 | unsigned char *b = skb_tail_pointer(skb); |
e9ce1cd3 | 239 | struct tcf_ipt *ipt = a->priv; |
1da177e4 LT |
240 | struct ipt_entry_target *t; |
241 | struct tcf_t tm; | |
242 | struct tc_cnt c; | |
1da177e4 LT |
243 | |
244 | /* for simple targets kernel size == user size | |
245 | ** user name = target name | |
246 | ** for foolproof you need to not assume this | |
247 | */ | |
248 | ||
c7b1b249 | 249 | t = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC); |
e9ce1cd3 | 250 | if (unlikely(!t)) |
7ba699c6 | 251 | goto nla_put_failure; |
1da177e4 | 252 | |
e9ce1cd3 DM |
253 | c.bindcnt = ipt->tcf_bindcnt - bind; |
254 | c.refcnt = ipt->tcf_refcnt - ref; | |
e9ce1cd3 DM |
255 | strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name); |
256 | ||
7ba699c6 | 257 | NLA_PUT(skb, TCA_IPT_TARG, ipt->tcfi_t->u.user.target_size, t); |
24beeab5 PM |
258 | NLA_PUT_U32(skb, TCA_IPT_INDEX, ipt->tcf_index); |
259 | NLA_PUT_U32(skb, TCA_IPT_HOOK, ipt->tcfi_hook); | |
7ba699c6 | 260 | NLA_PUT(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c); |
57e1c487 | 261 | NLA_PUT_STRING(skb, TCA_IPT_TABLE, ipt->tcfi_tname); |
e9ce1cd3 DM |
262 | tm.install = jiffies_to_clock_t(jiffies - ipt->tcf_tm.install); |
263 | tm.lastuse = jiffies_to_clock_t(jiffies - ipt->tcf_tm.lastuse); | |
264 | tm.expires = jiffies_to_clock_t(ipt->tcf_tm.expires); | |
7ba699c6 | 265 | NLA_PUT(skb, TCA_IPT_TM, sizeof (tm), &tm); |
1da177e4 LT |
266 | kfree(t); |
267 | return skb->len; | |
268 | ||
7ba699c6 | 269 | nla_put_failure: |
dc5fc579 | 270 | nlmsg_trim(skb, b); |
1da177e4 LT |
271 | kfree(t); |
272 | return -1; | |
273 | } | |
274 | ||
275 | static struct tc_action_ops act_ipt_ops = { | |
276 | .kind = "ipt", | |
e9ce1cd3 | 277 | .hinfo = &ipt_hash_info, |
1da177e4 LT |
278 | .type = TCA_ACT_IPT, |
279 | .capab = TCA_CAP_NONE, | |
280 | .owner = THIS_MODULE, | |
281 | .act = tcf_ipt, | |
282 | .dump = tcf_ipt_dump, | |
283 | .cleanup = tcf_ipt_cleanup, | |
284 | .lookup = tcf_hash_search, | |
285 | .init = tcf_ipt_init, | |
286 | .walk = tcf_generic_walker | |
287 | }; | |
288 | ||
289 | MODULE_AUTHOR("Jamal Hadi Salim(2002-4)"); | |
290 | MODULE_DESCRIPTION("Iptables target actions"); | |
291 | MODULE_LICENSE("GPL"); | |
292 | ||
e9ce1cd3 | 293 | static int __init ipt_init_module(void) |
1da177e4 LT |
294 | { |
295 | return tcf_register_action(&act_ipt_ops); | |
296 | } | |
297 | ||
e9ce1cd3 | 298 | static void __exit ipt_cleanup_module(void) |
1da177e4 LT |
299 | { |
300 | tcf_unregister_action(&act_ipt_ops); | |
301 | } | |
302 | ||
303 | module_init(ipt_init_module); | |
304 | module_exit(ipt_cleanup_module); |