Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
e87cc472 | 2 | * net/sched/ipt.c iptables target interface |
1da177e4 LT |
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> | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
dc5fc579 | 23 | #include <net/netlink.h> |
1da177e4 LT |
24 | #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 | ||
1da177e4 | 30 | |
e9ce1cd3 DM |
31 | #define IPT_TAB_MASK 15 |
32 | static struct tcf_common *tcf_ipt_ht[IPT_TAB_MASK + 1]; | |
33 | static u32 ipt_idx_gen; | |
1da177e4 LT |
34 | static DEFINE_RWLOCK(ipt_lock); |
35 | ||
e9ce1cd3 DM |
36 | static struct tcf_hashinfo ipt_hash_info = { |
37 | .htab = tcf_ipt_ht, | |
38 | .hmask = IPT_TAB_MASK, | |
39 | .lock = &ipt_lock, | |
40 | }; | |
1da177e4 | 41 | |
87a2e70d | 42 | static int ipt_init_target(struct xt_entry_target *t, char *table, unsigned int hook) |
1da177e4 | 43 | { |
af5d6dc2 | 44 | struct xt_tgchk_param par; |
e60a13e0 | 45 | struct xt_target *target; |
1da177e4 LT |
46 | int ret = 0; |
47 | ||
239a87c8 PM |
48 | target = xt_request_find_target(AF_INET, t->u.user.name, |
49 | t->u.user.revision); | |
d2a7b6ba JE |
50 | if (IS_ERR(target)) |
51 | return PTR_ERR(target); | |
1da177e4 | 52 | |
1da177e4 | 53 | t->u.kernel.target = target; |
af5d6dc2 JE |
54 | par.table = table; |
55 | par.entryinfo = NULL; | |
56 | par.target = target; | |
57 | par.targinfo = t->data; | |
58 | par.hook_mask = hook; | |
916a917d | 59 | par.family = NFPROTO_IPV4; |
1da177e4 | 60 | |
916a917d | 61 | ret = xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false); |
367c6790 | 62 | if (ret < 0) { |
239a87c8 | 63 | module_put(t->u.kernel.target->me); |
18118cdb | 64 | return ret; |
239a87c8 | 65 | } |
367c6790 | 66 | return 0; |
1da177e4 LT |
67 | } |
68 | ||
87a2e70d | 69 | static void ipt_destroy_target(struct xt_entry_target *t) |
1da177e4 | 70 | { |
a2df1648 JE |
71 | 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); | |
1da177e4 LT |
78 | } |
79 | ||
e9ce1cd3 | 80 | static int tcf_ipt_release(struct tcf_ipt *ipt, int bind) |
1da177e4 LT |
81 | { |
82 | int ret = 0; | |
e9ce1cd3 | 83 | if (ipt) { |
1da177e4 | 84 | if (bind) |
e9ce1cd3 DM |
85 | 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); | |
1da177e4 LT |
92 | ret = ACT_P_DELETED; |
93 | } | |
94 | } | |
95 | return ret; | |
96 | } | |
97 | ||
53b2bf3f PM |
98 | static 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 }, | |
87a2e70d | 102 | [TCA_IPT_TARG] = { .len = sizeof(struct xt_entry_target) }, |
53b2bf3f PM |
103 | }; |
104 | ||
7ba699c6 | 105 | static int tcf_ipt_init(struct nlattr *nla, struct nlattr *est, |
e9ce1cd3 | 106 | struct tc_action *a, int ovr, int bind) |
1da177e4 | 107 | { |
7ba699c6 | 108 | struct nlattr *tb[TCA_IPT_MAX + 1]; |
e9ce1cd3 DM |
109 | struct tcf_ipt *ipt; |
110 | struct tcf_common *pc; | |
87a2e70d | 111 | struct xt_entry_target *td, *t; |
1da177e4 LT |
112 | char *tname; |
113 | int ret = 0, err; | |
114 | u32 hook = 0; | |
115 | u32 index = 0; | |
116 | ||
cee63723 | 117 | if (nla == NULL) |
1da177e4 LT |
118 | return -EINVAL; |
119 | ||
53b2bf3f | 120 | err = nla_parse_nested(tb, TCA_IPT_MAX, nla, ipt_policy); |
cee63723 PM |
121 | if (err < 0) |
122 | return err; | |
123 | ||
53b2bf3f | 124 | if (tb[TCA_IPT_HOOK] == NULL) |
1da177e4 | 125 | return -EINVAL; |
53b2bf3f | 126 | if (tb[TCA_IPT_TARG] == NULL) |
1da177e4 | 127 | return -EINVAL; |
53b2bf3f | 128 | |
87a2e70d | 129 | td = (struct xt_entry_target *)nla_data(tb[TCA_IPT_TARG]); |
7ba699c6 | 130 | if (nla_len(tb[TCA_IPT_TARG]) < td->u.target_size) |
1da177e4 LT |
131 | return -EINVAL; |
132 | ||
53b2bf3f | 133 | if (tb[TCA_IPT_INDEX] != NULL) |
1587bac4 | 134 | index = nla_get_u32(tb[TCA_IPT_INDEX]); |
1da177e4 | 135 | |
e9ce1cd3 DM |
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); | |
0e991ec6 | 140 | if (IS_ERR(pc)) |
cc7ec456 | 141 | return PTR_ERR(pc); |
1da177e4 LT |
142 | ret = ACT_P_CREATED; |
143 | } else { | |
144 | if (!ovr) { | |
e9ce1cd3 | 145 | tcf_ipt_release(to_ipt(pc), bind); |
1da177e4 LT |
146 | return -EEXIST; |
147 | } | |
148 | } | |
e9ce1cd3 | 149 | ipt = to_ipt(pc); |
1da177e4 | 150 | |
1587bac4 | 151 | hook = nla_get_u32(tb[TCA_IPT_HOOK]); |
1da177e4 LT |
152 | |
153 | err = -ENOMEM; | |
154 | tname = kmalloc(IFNAMSIZ, GFP_KERNEL); | |
e9ce1cd3 | 155 | if (unlikely(!tname)) |
1da177e4 | 156 | goto err1; |
7ba699c6 PM |
157 | if (tb[TCA_IPT_TABLE] == NULL || |
158 | nla_strlcpy(tname, tb[TCA_IPT_TABLE], IFNAMSIZ) >= IFNAMSIZ) | |
1da177e4 LT |
159 | strcpy(tname, "mangle"); |
160 | ||
c7b1b249 | 161 | t = kmemdup(td, td->u.target_size, GFP_KERNEL); |
e9ce1cd3 | 162 | if (unlikely(!t)) |
1da177e4 | 163 | goto err2; |
1da177e4 | 164 | |
cc7ec456 ED |
165 | err = ipt_init_target(t, tname, hook); |
166 | if (err < 0) | |
1da177e4 LT |
167 | goto err3; |
168 | ||
e9ce1cd3 | 169 | spin_lock_bh(&ipt->tcf_lock); |
1da177e4 | 170 | if (ret != ACT_P_CREATED) { |
e9ce1cd3 DM |
171 | ipt_destroy_target(ipt->tcfi_t); |
172 | kfree(ipt->tcfi_tname); | |
173 | kfree(ipt->tcfi_t); | |
1da177e4 | 174 | } |
e9ce1cd3 DM |
175 | ipt->tcfi_tname = tname; |
176 | ipt->tcfi_t = t; | |
177 | ipt->tcfi_hook = hook; | |
178 | spin_unlock_bh(&ipt->tcf_lock); | |
1da177e4 | 179 | if (ret == ACT_P_CREATED) |
e9ce1cd3 | 180 | tcf_hash_insert(pc, &ipt_hash_info); |
1da177e4 LT |
181 | return ret; |
182 | ||
183 | err3: | |
184 | kfree(t); | |
185 | err2: | |
186 | kfree(tname); | |
187 | err1: | |
e9ce1cd3 | 188 | kfree(pc); |
1da177e4 LT |
189 | return err; |
190 | } | |
191 | ||
e9ce1cd3 | 192 | static int tcf_ipt_cleanup(struct tc_action *a, int bind) |
1da177e4 | 193 | { |
e9ce1cd3 DM |
194 | struct tcf_ipt *ipt = a->priv; |
195 | return tcf_ipt_release(ipt, bind); | |
1da177e4 LT |
196 | } |
197 | ||
dc7f9f6e | 198 | static int tcf_ipt(struct sk_buff *skb, const struct tc_action *a, |
e9ce1cd3 | 199 | struct tcf_result *res) |
1da177e4 LT |
200 | { |
201 | int ret = 0, result = 0; | |
e9ce1cd3 | 202 | struct tcf_ipt *ipt = a->priv; |
4b560b44 | 203 | struct xt_action_param par; |
1da177e4 LT |
204 | |
205 | if (skb_cloned(skb)) { | |
206 | if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) | |
207 | return TC_ACT_UNSPEC; | |
208 | } | |
209 | ||
e9ce1cd3 | 210 | spin_lock(&ipt->tcf_lock); |
1da177e4 | 211 | |
e9ce1cd3 | 212 | ipt->tcf_tm.lastuse = jiffies; |
bfe0d029 | 213 | bstats_update(&ipt->tcf_bstats, skb); |
1da177e4 LT |
214 | |
215 | /* yes, we have to worry about both in and out dev | |
cc7ec456 ED |
216 | * worry later - danger - this API seems to have changed |
217 | * from earlier kernels | |
218 | */ | |
7eb35586 JE |
219 | par.in = skb->dev; |
220 | par.out = NULL; | |
221 | par.hooknum = ipt->tcfi_hook; | |
222 | par.target = ipt->tcfi_t->u.kernel.target; | |
223 | par.targinfo = ipt->tcfi_t->data; | |
224 | ret = par.target->target(skb, &par); | |
225 | ||
1da177e4 LT |
226 | switch (ret) { |
227 | case NF_ACCEPT: | |
228 | result = TC_ACT_OK; | |
229 | break; | |
230 | case NF_DROP: | |
231 | result = TC_ACT_SHOT; | |
e9ce1cd3 | 232 | ipt->tcf_qstats.drops++; |
1da177e4 | 233 | break; |
243bf6e2 | 234 | case XT_CONTINUE: |
1da177e4 LT |
235 | result = TC_ACT_PIPE; |
236 | break; | |
237 | default: | |
e87cc472 JP |
238 | net_notice_ratelimited("tc filter: Bogus netfilter code %d assume ACCEPT\n", |
239 | ret); | |
1da177e4 LT |
240 | result = TC_POLICE_OK; |
241 | break; | |
242 | } | |
e9ce1cd3 | 243 | spin_unlock(&ipt->tcf_lock); |
1da177e4 LT |
244 | return result; |
245 | ||
246 | } | |
247 | ||
e9ce1cd3 | 248 | static int tcf_ipt_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref) |
1da177e4 | 249 | { |
27a884dc | 250 | unsigned char *b = skb_tail_pointer(skb); |
e9ce1cd3 | 251 | struct tcf_ipt *ipt = a->priv; |
87a2e70d | 252 | struct xt_entry_target *t; |
1da177e4 LT |
253 | struct tcf_t tm; |
254 | struct tc_cnt c; | |
1da177e4 LT |
255 | |
256 | /* for simple targets kernel size == user size | |
cc7ec456 ED |
257 | * user name = target name |
258 | * for foolproof you need to not assume this | |
259 | */ | |
1da177e4 | 260 | |
c7b1b249 | 261 | t = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC); |
e9ce1cd3 | 262 | if (unlikely(!t)) |
7ba699c6 | 263 | goto nla_put_failure; |
1da177e4 | 264 | |
e9ce1cd3 DM |
265 | c.bindcnt = ipt->tcf_bindcnt - bind; |
266 | c.refcnt = ipt->tcf_refcnt - ref; | |
e9ce1cd3 DM |
267 | strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name); |
268 | ||
1b34ec43 DM |
269 | if (nla_put(skb, TCA_IPT_TARG, ipt->tcfi_t->u.user.target_size, t) || |
270 | nla_put_u32(skb, TCA_IPT_INDEX, ipt->tcf_index) || | |
271 | nla_put_u32(skb, TCA_IPT_HOOK, ipt->tcfi_hook) || | |
272 | nla_put(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c) || | |
273 | nla_put_string(skb, TCA_IPT_TABLE, ipt->tcfi_tname)) | |
274 | goto nla_put_failure; | |
e9ce1cd3 DM |
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); | |
1b34ec43 DM |
278 | if (nla_put(skb, TCA_IPT_TM, sizeof (tm), &tm)) |
279 | goto nla_put_failure; | |
1da177e4 LT |
280 | kfree(t); |
281 | return skb->len; | |
282 | ||
7ba699c6 | 283 | nla_put_failure: |
dc5fc579 | 284 | nlmsg_trim(skb, b); |
1da177e4 LT |
285 | kfree(t); |
286 | return -1; | |
287 | } | |
288 | ||
289 | static struct tc_action_ops act_ipt_ops = { | |
290 | .kind = "ipt", | |
e9ce1cd3 | 291 | .hinfo = &ipt_hash_info, |
1da177e4 LT |
292 | .type = TCA_ACT_IPT, |
293 | .capab = TCA_CAP_NONE, | |
294 | .owner = THIS_MODULE, | |
295 | .act = tcf_ipt, | |
296 | .dump = tcf_ipt_dump, | |
297 | .cleanup = tcf_ipt_cleanup, | |
298 | .lookup = tcf_hash_search, | |
299 | .init = tcf_ipt_init, | |
300 | .walk = tcf_generic_walker | |
301 | }; | |
302 | ||
303 | MODULE_AUTHOR("Jamal Hadi Salim(2002-4)"); | |
304 | MODULE_DESCRIPTION("Iptables target actions"); | |
305 | MODULE_LICENSE("GPL"); | |
306 | ||
e9ce1cd3 | 307 | static int __init ipt_init_module(void) |
1da177e4 LT |
308 | { |
309 | return tcf_register_action(&act_ipt_ops); | |
310 | } | |
311 | ||
e9ce1cd3 | 312 | static void __exit ipt_cleanup_module(void) |
1da177e4 LT |
313 | { |
314 | tcf_unregister_action(&act_ipt_ops); | |
315 | } | |
316 | ||
317 | module_init(ipt_init_module); | |
318 | module_exit(ipt_cleanup_module); |