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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
14#include <linux/types.h>
15#include <linux/kernel.h>
16#include <linux/string.h>
17#include <linux/errno.h>
18#include <linux/skbuff.h>
19#include <linux/rtnetlink.h>
20#include <linux/module.h>
21#include <linux/init.h>
22#include <linux/slab.h>
23#include <net/netlink.h>
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
30
31#define IPT_TAB_MASK 15
32static struct tcf_common *tcf_ipt_ht[IPT_TAB_MASK + 1];
33static u32 ipt_idx_gen;
34static DEFINE_RWLOCK(ipt_lock);
35
36static struct tcf_hashinfo ipt_hash_info = {
37 .htab = tcf_ipt_ht,
38 .hmask = IPT_TAB_MASK,
39 .lock = &ipt_lock,
40};
41
42static int ipt_init_target(struct xt_entry_target *t, char *table, unsigned int hook)
43{
44 struct xt_tgchk_param par;
45 struct xt_target *target;
46 int ret = 0;
47
48 target = xt_request_find_target(AF_INET, t->u.user.name,
49 t->u.user.revision);
50 if (IS_ERR(target))
51 return PTR_ERR(target);
52
53 t->u.kernel.target = target;
54 par.table = table;
55 par.entryinfo = NULL;
56 par.target = target;
57 par.targinfo = t->data;
58 par.hook_mask = hook;
59 par.family = NFPROTO_IPV4;
60
61 ret = xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false);
62 if (ret < 0) {
63 module_put(t->u.kernel.target->me);
64 return ret;
65 }
66 return 0;
67}
68
69static void ipt_destroy_target(struct xt_entry_target *t)
70{
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);
78}
79
80static int tcf_ipt_release(struct tcf_ipt *ipt, int bind)
81{
82 int ret = 0;
83 if (ipt) {
84 if (bind)
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);
92 ret = ACT_P_DELETED;
93 }
94 }
95 return ret;
96}
97
98static 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 },
102 [TCA_IPT_TARG] = { .len = sizeof(struct xt_entry_target) },
103};
104
105static int tcf_ipt_init(struct nlattr *nla, struct nlattr *est,
106 struct tc_action *a, int ovr, int bind)
107{
108 struct nlattr *tb[TCA_IPT_MAX + 1];
109 struct tcf_ipt *ipt;
110 struct tcf_common *pc;
111 struct xt_entry_target *td, *t;
112 char *tname;
113 int ret = 0, err;
114 u32 hook = 0;
115 u32 index = 0;
116
117 if (nla == NULL)
118 return -EINVAL;
119
120 err = nla_parse_nested(tb, TCA_IPT_MAX, nla, ipt_policy);
121 if (err < 0)
122 return err;
123
124 if (tb[TCA_IPT_HOOK] == NULL)
125 return -EINVAL;
126 if (tb[TCA_IPT_TARG] == NULL)
127 return -EINVAL;
128
129 td = (struct xt_entry_target *)nla_data(tb[TCA_IPT_TARG]);
130 if (nla_len(tb[TCA_IPT_TARG]) < td->u.target_size)
131 return -EINVAL;
132
133 if (tb[TCA_IPT_INDEX] != NULL)
134 index = nla_get_u32(tb[TCA_IPT_INDEX]);
135
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 (IS_ERR(pc))
141 return PTR_ERR(pc);
142 ret = ACT_P_CREATED;
143 } else {
144 if (!ovr) {
145 tcf_ipt_release(to_ipt(pc), bind);
146 return -EEXIST;
147 }
148 }
149 ipt = to_ipt(pc);
150
151 hook = nla_get_u32(tb[TCA_IPT_HOOK]);
152
153 err = -ENOMEM;
154 tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
155 if (unlikely(!tname))
156 goto err1;
157 if (tb[TCA_IPT_TABLE] == NULL ||
158 nla_strlcpy(tname, tb[TCA_IPT_TABLE], IFNAMSIZ) >= IFNAMSIZ)
159 strcpy(tname, "mangle");
160
161 t = kmemdup(td, td->u.target_size, GFP_KERNEL);
162 if (unlikely(!t))
163 goto err2;
164
165 err = ipt_init_target(t, tname, hook);
166 if (err < 0)
167 goto err3;
168
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);
174 }
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;
182
183err3:
184 kfree(t);
185err2:
186 kfree(tname);
187err1:
188 kfree(pc);
189 return err;
190}
191
192static int tcf_ipt_cleanup(struct tc_action *a, int bind)
193{
194 struct tcf_ipt *ipt = a->priv;
195 return tcf_ipt_release(ipt, bind);
196}
197
198static int tcf_ipt(struct sk_buff *skb, const struct tc_action *a,
199 struct tcf_result *res)
200{
201 int ret = 0, result = 0;
202 struct tcf_ipt *ipt = a->priv;
203 struct xt_action_param par;
204
205 if (skb_cloned(skb)) {
206 if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
207 return TC_ACT_UNSPEC;
208 }
209
210 spin_lock(&ipt->tcf_lock);
211
212 ipt->tcf_tm.lastuse = jiffies;
213 bstats_update(&ipt->tcf_bstats, skb);
214
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
218 */
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
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 XT_CONTINUE:
235 result = TC_ACT_PIPE;
236 break;
237 default:
238 if (net_ratelimit())
239 pr_notice("tc filter: Bogus netfilter code"
240 " %d assume ACCEPT\n", ret);
241 result = TC_POLICE_OK;
242 break;
243 }
244 spin_unlock(&ipt->tcf_lock);
245 return result;
246
247}
248
249static int tcf_ipt_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
250{
251 unsigned char *b = skb_tail_pointer(skb);
252 struct tcf_ipt *ipt = a->priv;
253 struct xt_entry_target *t;
254 struct tcf_t tm;
255 struct tc_cnt c;
256
257 /* for simple targets kernel size == user size
258 * user name = target name
259 * for foolproof you need to not assume this
260 */
261
262 t = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC);
263 if (unlikely(!t))
264 goto nla_put_failure;
265
266 c.bindcnt = ipt->tcf_bindcnt - bind;
267 c.refcnt = ipt->tcf_refcnt - ref;
268 strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name);
269
270 NLA_PUT(skb, TCA_IPT_TARG, ipt->tcfi_t->u.user.target_size, t);
271 NLA_PUT_U32(skb, TCA_IPT_INDEX, ipt->tcf_index);
272 NLA_PUT_U32(skb, TCA_IPT_HOOK, ipt->tcfi_hook);
273 NLA_PUT(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c);
274 NLA_PUT_STRING(skb, TCA_IPT_TABLE, 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 NLA_PUT(skb, TCA_IPT_TM, sizeof (tm), &tm);
279 kfree(t);
280 return skb->len;
281
282nla_put_failure:
283 nlmsg_trim(skb, b);
284 kfree(t);
285 return -1;
286}
287
288static 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
300};
301
302MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
303MODULE_DESCRIPTION("Iptables target actions");
304MODULE_LICENSE("GPL");
305
306static int __init ipt_init_module(void)
307{
308 return tcf_register_action(&act_ipt_ops);
309}
310
311static void __exit ipt_cleanup_module(void)
312{
313 tcf_unregister_action(&act_ipt_ops);
314}
315
316module_init(ipt_init_module);
317module_exit(ipt_cleanup_module);
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 (2002-13)
12 */
13
14#include <linux/types.h>
15#include <linux/kernel.h>
16#include <linux/string.h>
17#include <linux/errno.h>
18#include <linux/skbuff.h>
19#include <linux/rtnetlink.h>
20#include <linux/module.h>
21#include <linux/init.h>
22#include <linux/slab.h>
23#include <net/netlink.h>
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
30
31#define IPT_TAB_MASK 15
32
33static int ipt_init_target(struct xt_entry_target *t, char *table, unsigned int hook)
34{
35 struct xt_tgchk_param par;
36 struct xt_target *target;
37 int ret = 0;
38
39 target = xt_request_find_target(AF_INET, t->u.user.name,
40 t->u.user.revision);
41 if (IS_ERR(target))
42 return PTR_ERR(target);
43
44 t->u.kernel.target = target;
45 par.table = table;
46 par.entryinfo = NULL;
47 par.target = target;
48 par.targinfo = t->data;
49 par.hook_mask = hook;
50 par.family = NFPROTO_IPV4;
51
52 ret = xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false);
53 if (ret < 0) {
54 module_put(t->u.kernel.target->me);
55 return ret;
56 }
57 return 0;
58}
59
60static void ipt_destroy_target(struct xt_entry_target *t)
61{
62 struct xt_tgdtor_param par = {
63 .target = t->u.kernel.target,
64 .targinfo = t->data,
65 };
66 if (par.target->destroy != NULL)
67 par.target->destroy(&par);
68 module_put(par.target->me);
69}
70
71static void tcf_ipt_release(struct tc_action *a, int bind)
72{
73 struct tcf_ipt *ipt = to_ipt(a);
74 ipt_destroy_target(ipt->tcfi_t);
75 kfree(ipt->tcfi_tname);
76 kfree(ipt->tcfi_t);
77}
78
79static const struct nla_policy ipt_policy[TCA_IPT_MAX + 1] = {
80 [TCA_IPT_TABLE] = { .type = NLA_STRING, .len = IFNAMSIZ },
81 [TCA_IPT_HOOK] = { .type = NLA_U32 },
82 [TCA_IPT_INDEX] = { .type = NLA_U32 },
83 [TCA_IPT_TARG] = { .len = sizeof(struct xt_entry_target) },
84};
85
86static int tcf_ipt_init(struct net *net, struct nlattr *nla, struct nlattr *est,
87 struct tc_action *a, int ovr, int bind)
88{
89 struct nlattr *tb[TCA_IPT_MAX + 1];
90 struct tcf_ipt *ipt;
91 struct xt_entry_target *td, *t;
92 char *tname;
93 int ret = 0, err;
94 u32 hook = 0;
95 u32 index = 0;
96
97 if (nla == NULL)
98 return -EINVAL;
99
100 err = nla_parse_nested(tb, TCA_IPT_MAX, nla, ipt_policy);
101 if (err < 0)
102 return err;
103
104 if (tb[TCA_IPT_HOOK] == NULL)
105 return -EINVAL;
106 if (tb[TCA_IPT_TARG] == NULL)
107 return -EINVAL;
108
109 td = (struct xt_entry_target *)nla_data(tb[TCA_IPT_TARG]);
110 if (nla_len(tb[TCA_IPT_TARG]) < td->u.target_size)
111 return -EINVAL;
112
113 if (tb[TCA_IPT_INDEX] != NULL)
114 index = nla_get_u32(tb[TCA_IPT_INDEX]);
115
116 if (!tcf_hash_check(index, a, bind) ) {
117 ret = tcf_hash_create(index, est, a, sizeof(*ipt), bind);
118 if (ret)
119 return ret;
120 ret = ACT_P_CREATED;
121 } else {
122 if (bind)/* dont override defaults */
123 return 0;
124 tcf_hash_release(a, bind);
125
126 if (!ovr)
127 return -EEXIST;
128 }
129 ipt = to_ipt(a);
130
131 hook = nla_get_u32(tb[TCA_IPT_HOOK]);
132
133 err = -ENOMEM;
134 tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
135 if (unlikely(!tname))
136 goto err1;
137 if (tb[TCA_IPT_TABLE] == NULL ||
138 nla_strlcpy(tname, tb[TCA_IPT_TABLE], IFNAMSIZ) >= IFNAMSIZ)
139 strcpy(tname, "mangle");
140
141 t = kmemdup(td, td->u.target_size, GFP_KERNEL);
142 if (unlikely(!t))
143 goto err2;
144
145 err = ipt_init_target(t, tname, hook);
146 if (err < 0)
147 goto err3;
148
149 spin_lock_bh(&ipt->tcf_lock);
150 if (ret != ACT_P_CREATED) {
151 ipt_destroy_target(ipt->tcfi_t);
152 kfree(ipt->tcfi_tname);
153 kfree(ipt->tcfi_t);
154 }
155 ipt->tcfi_tname = tname;
156 ipt->tcfi_t = t;
157 ipt->tcfi_hook = hook;
158 spin_unlock_bh(&ipt->tcf_lock);
159 if (ret == ACT_P_CREATED)
160 tcf_hash_insert(a);
161 return ret;
162
163err3:
164 kfree(t);
165err2:
166 kfree(tname);
167err1:
168 if (ret == ACT_P_CREATED)
169 tcf_hash_cleanup(a, est);
170 return err;
171}
172
173static int tcf_ipt(struct sk_buff *skb, const struct tc_action *a,
174 struct tcf_result *res)
175{
176 int ret = 0, result = 0;
177 struct tcf_ipt *ipt = a->priv;
178 struct xt_action_param par;
179
180 if (skb_unclone(skb, GFP_ATOMIC))
181 return TC_ACT_UNSPEC;
182
183 spin_lock(&ipt->tcf_lock);
184
185 ipt->tcf_tm.lastuse = jiffies;
186 bstats_update(&ipt->tcf_bstats, skb);
187
188 /* yes, we have to worry about both in and out dev
189 * worry later - danger - this API seems to have changed
190 * from earlier kernels
191 */
192 par.in = skb->dev;
193 par.out = NULL;
194 par.hooknum = ipt->tcfi_hook;
195 par.target = ipt->tcfi_t->u.kernel.target;
196 par.targinfo = ipt->tcfi_t->data;
197 ret = par.target->target(skb, &par);
198
199 switch (ret) {
200 case NF_ACCEPT:
201 result = TC_ACT_OK;
202 break;
203 case NF_DROP:
204 result = TC_ACT_SHOT;
205 ipt->tcf_qstats.drops++;
206 break;
207 case XT_CONTINUE:
208 result = TC_ACT_PIPE;
209 break;
210 default:
211 net_notice_ratelimited("tc filter: Bogus netfilter code %d assume ACCEPT\n",
212 ret);
213 result = TC_POLICE_OK;
214 break;
215 }
216 spin_unlock(&ipt->tcf_lock);
217 return result;
218
219}
220
221static int tcf_ipt_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
222{
223 unsigned char *b = skb_tail_pointer(skb);
224 struct tcf_ipt *ipt = a->priv;
225 struct xt_entry_target *t;
226 struct tcf_t tm;
227 struct tc_cnt c;
228
229 /* for simple targets kernel size == user size
230 * user name = target name
231 * for foolproof you need to not assume this
232 */
233
234 t = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC);
235 if (unlikely(!t))
236 goto nla_put_failure;
237
238 c.bindcnt = ipt->tcf_bindcnt - bind;
239 c.refcnt = ipt->tcf_refcnt - ref;
240 strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name);
241
242 if (nla_put(skb, TCA_IPT_TARG, ipt->tcfi_t->u.user.target_size, t) ||
243 nla_put_u32(skb, TCA_IPT_INDEX, ipt->tcf_index) ||
244 nla_put_u32(skb, TCA_IPT_HOOK, ipt->tcfi_hook) ||
245 nla_put(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c) ||
246 nla_put_string(skb, TCA_IPT_TABLE, ipt->tcfi_tname))
247 goto nla_put_failure;
248 tm.install = jiffies_to_clock_t(jiffies - ipt->tcf_tm.install);
249 tm.lastuse = jiffies_to_clock_t(jiffies - ipt->tcf_tm.lastuse);
250 tm.expires = jiffies_to_clock_t(ipt->tcf_tm.expires);
251 if (nla_put(skb, TCA_IPT_TM, sizeof (tm), &tm))
252 goto nla_put_failure;
253 kfree(t);
254 return skb->len;
255
256nla_put_failure:
257 nlmsg_trim(skb, b);
258 kfree(t);
259 return -1;
260}
261
262static struct tc_action_ops act_ipt_ops = {
263 .kind = "ipt",
264 .type = TCA_ACT_IPT,
265 .owner = THIS_MODULE,
266 .act = tcf_ipt,
267 .dump = tcf_ipt_dump,
268 .cleanup = tcf_ipt_release,
269 .init = tcf_ipt_init,
270};
271
272static struct tc_action_ops act_xt_ops = {
273 .kind = "xt",
274 .type = TCA_ACT_XT,
275 .owner = THIS_MODULE,
276 .act = tcf_ipt,
277 .dump = tcf_ipt_dump,
278 .cleanup = tcf_ipt_release,
279 .init = tcf_ipt_init,
280};
281
282MODULE_AUTHOR("Jamal Hadi Salim(2002-13)");
283MODULE_DESCRIPTION("Iptables target actions");
284MODULE_LICENSE("GPL");
285MODULE_ALIAS("act_xt");
286
287static int __init ipt_init_module(void)
288{
289 int ret1, ret2;
290
291 ret1 = tcf_register_action(&act_xt_ops, IPT_TAB_MASK);
292 if (ret1 < 0)
293 printk("Failed to load xt action\n");
294 ret2 = tcf_register_action(&act_ipt_ops, IPT_TAB_MASK);
295 if (ret2 < 0)
296 printk("Failed to load ipt action\n");
297
298 if (ret1 < 0 && ret2 < 0) {
299 return ret1;
300 } else
301 return 0;
302}
303
304static void __exit ipt_cleanup_module(void)
305{
306 tcf_unregister_action(&act_xt_ops);
307 tcf_unregister_action(&act_ipt_ops);
308}
309
310module_init(ipt_init_module);
311module_exit(ipt_cleanup_module);