2 * net/sched/act_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 (2002-13)
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>
28 #include <linux/netfilter_ipv4/ip_tables.h>
31 #define IPT_TAB_MASK 15
33 static int ipt_net_id
;
37 static int ipt_init_target(struct xt_entry_target
*t
, char *table
, unsigned int hook
)
39 struct xt_tgchk_param par
;
40 struct xt_target
*target
;
43 target
= xt_request_find_target(AF_INET
, t
->u
.user
.name
,
46 return PTR_ERR(target
);
48 t
->u
.kernel
.target
= target
;
52 par
.targinfo
= t
->data
;
54 par
.family
= NFPROTO_IPV4
;
56 ret
= xt_check_target(&par
, t
->u
.target_size
- sizeof(*t
), 0, false);
58 module_put(t
->u
.kernel
.target
->me
);
64 static void ipt_destroy_target(struct xt_entry_target
*t
)
66 struct xt_tgdtor_param par
= {
67 .target
= t
->u
.kernel
.target
,
69 .family
= NFPROTO_IPV4
,
71 if (par
.target
->destroy
!= NULL
)
72 par
.target
->destroy(&par
);
73 module_put(par
.target
->me
);
76 static void tcf_ipt_release(struct tc_action
*a
, int bind
)
78 struct tcf_ipt
*ipt
= to_ipt(a
);
79 ipt_destroy_target(ipt
->tcfi_t
);
80 kfree(ipt
->tcfi_tname
);
84 static const struct nla_policy ipt_policy
[TCA_IPT_MAX
+ 1] = {
85 [TCA_IPT_TABLE
] = { .type
= NLA_STRING
, .len
= IFNAMSIZ
},
86 [TCA_IPT_HOOK
] = { .type
= NLA_U32
},
87 [TCA_IPT_INDEX
] = { .type
= NLA_U32
},
88 [TCA_IPT_TARG
] = { .len
= sizeof(struct xt_entry_target
) },
91 static int __tcf_ipt_init(struct tc_action_net
*tn
, struct nlattr
*nla
,
92 struct nlattr
*est
, struct tc_action
*a
, int ovr
,
95 struct nlattr
*tb
[TCA_IPT_MAX
+ 1];
97 struct xt_entry_target
*td
, *t
;
99 int ret
= 0, err
, exists
= 0;
106 err
= nla_parse_nested(tb
, TCA_IPT_MAX
, nla
, ipt_policy
);
110 if (tb
[TCA_IPT_INDEX
] != NULL
)
111 index
= nla_get_u32(tb
[TCA_IPT_INDEX
]);
113 exists
= tcf_hash_check(tn
, index
, a
, bind
);
117 if (tb
[TCA_IPT_HOOK
] == NULL
|| tb
[TCA_IPT_TARG
] == NULL
) {
119 tcf_hash_release(a
, bind
);
123 td
= (struct xt_entry_target
*)nla_data(tb
[TCA_IPT_TARG
]);
124 if (nla_len(tb
[TCA_IPT_TARG
]) < td
->u
.target_size
) {
126 tcf_hash_release(a
, bind
);
131 ret
= tcf_hash_create(tn
, index
, est
, a
, sizeof(*ipt
), bind
,
137 if (bind
)/* dont override defaults */
139 tcf_hash_release(a
, bind
);
146 hook
= nla_get_u32(tb
[TCA_IPT_HOOK
]);
149 tname
= kmalloc(IFNAMSIZ
, GFP_KERNEL
);
150 if (unlikely(!tname
))
152 if (tb
[TCA_IPT_TABLE
] == NULL
||
153 nla_strlcpy(tname
, tb
[TCA_IPT_TABLE
], IFNAMSIZ
) >= IFNAMSIZ
)
154 strcpy(tname
, "mangle");
156 t
= kmemdup(td
, td
->u
.target_size
, GFP_KERNEL
);
160 err
= ipt_init_target(t
, tname
, hook
);
164 spin_lock_bh(&ipt
->tcf_lock
);
165 if (ret
!= ACT_P_CREATED
) {
166 ipt_destroy_target(ipt
->tcfi_t
);
167 kfree(ipt
->tcfi_tname
);
170 ipt
->tcfi_tname
= tname
;
172 ipt
->tcfi_hook
= hook
;
173 spin_unlock_bh(&ipt
->tcf_lock
);
174 if (ret
== ACT_P_CREATED
)
175 tcf_hash_insert(tn
, a
);
183 if (ret
== ACT_P_CREATED
)
184 tcf_hash_cleanup(a
, est
);
188 static int tcf_ipt_init(struct net
*net
, struct nlattr
*nla
,
189 struct nlattr
*est
, struct tc_action
*a
, int ovr
,
192 struct tc_action_net
*tn
= net_generic(net
, ipt_net_id
);
194 return __tcf_ipt_init(tn
, nla
, est
, a
, ovr
, bind
);
197 static int tcf_xt_init(struct net
*net
, struct nlattr
*nla
,
198 struct nlattr
*est
, struct tc_action
*a
, int ovr
,
201 struct tc_action_net
*tn
= net_generic(net
, xt_net_id
);
203 return __tcf_ipt_init(tn
, nla
, est
, a
, ovr
, bind
);
206 static int tcf_ipt(struct sk_buff
*skb
, const struct tc_action
*a
,
207 struct tcf_result
*res
)
209 int ret
= 0, result
= 0;
210 struct tcf_ipt
*ipt
= a
->priv
;
211 struct xt_action_param par
;
213 if (skb_unclone(skb
, GFP_ATOMIC
))
214 return TC_ACT_UNSPEC
;
216 spin_lock(&ipt
->tcf_lock
);
218 ipt
->tcf_tm
.lastuse
= jiffies
;
219 bstats_update(&ipt
->tcf_bstats
, skb
);
221 /* yes, we have to worry about both in and out dev
222 * worry later - danger - this API seems to have changed
223 * from earlier kernels
225 par
.net
= dev_net(skb
->dev
);
228 par
.hooknum
= ipt
->tcfi_hook
;
229 par
.target
= ipt
->tcfi_t
->u
.kernel
.target
;
230 par
.targinfo
= ipt
->tcfi_t
->data
;
231 par
.family
= NFPROTO_IPV4
;
232 ret
= par
.target
->target(skb
, &par
);
239 result
= TC_ACT_SHOT
;
240 ipt
->tcf_qstats
.drops
++;
243 result
= TC_ACT_PIPE
;
246 net_notice_ratelimited("tc filter: Bogus netfilter code %d assume ACCEPT\n",
248 result
= TC_POLICE_OK
;
251 spin_unlock(&ipt
->tcf_lock
);
256 static int tcf_ipt_dump(struct sk_buff
*skb
, struct tc_action
*a
, int bind
, int ref
)
258 unsigned char *b
= skb_tail_pointer(skb
);
259 struct tcf_ipt
*ipt
= a
->priv
;
260 struct xt_entry_target
*t
;
264 /* for simple targets kernel size == user size
265 * user name = target name
266 * for foolproof you need to not assume this
269 t
= kmemdup(ipt
->tcfi_t
, ipt
->tcfi_t
->u
.user
.target_size
, GFP_ATOMIC
);
271 goto nla_put_failure
;
273 c
.bindcnt
= ipt
->tcf_bindcnt
- bind
;
274 c
.refcnt
= ipt
->tcf_refcnt
- ref
;
275 strcpy(t
->u
.user
.name
, ipt
->tcfi_t
->u
.kernel
.target
->name
);
277 if (nla_put(skb
, TCA_IPT_TARG
, ipt
->tcfi_t
->u
.user
.target_size
, t
) ||
278 nla_put_u32(skb
, TCA_IPT_INDEX
, ipt
->tcf_index
) ||
279 nla_put_u32(skb
, TCA_IPT_HOOK
, ipt
->tcfi_hook
) ||
280 nla_put(skb
, TCA_IPT_CNT
, sizeof(struct tc_cnt
), &c
) ||
281 nla_put_string(skb
, TCA_IPT_TABLE
, ipt
->tcfi_tname
))
282 goto nla_put_failure
;
283 tm
.install
= jiffies_to_clock_t(jiffies
- ipt
->tcf_tm
.install
);
284 tm
.lastuse
= jiffies_to_clock_t(jiffies
- ipt
->tcf_tm
.lastuse
);
285 tm
.expires
= jiffies_to_clock_t(ipt
->tcf_tm
.expires
);
286 if (nla_put_64bit(skb
, TCA_IPT_TM
, sizeof(tm
), &tm
, TCA_IPT_PAD
))
287 goto nla_put_failure
;
297 static int tcf_ipt_walker(struct net
*net
, struct sk_buff
*skb
,
298 struct netlink_callback
*cb
, int type
,
301 struct tc_action_net
*tn
= net_generic(net
, ipt_net_id
);
303 return tcf_generic_walker(tn
, skb
, cb
, type
, a
);
306 static int tcf_ipt_search(struct net
*net
, struct tc_action
*a
, u32 index
)
308 struct tc_action_net
*tn
= net_generic(net
, ipt_net_id
);
310 return tcf_hash_search(tn
, a
, index
);
313 static struct tc_action_ops act_ipt_ops
= {
316 .owner
= THIS_MODULE
,
318 .dump
= tcf_ipt_dump
,
319 .cleanup
= tcf_ipt_release
,
320 .init
= tcf_ipt_init
,
321 .walk
= tcf_ipt_walker
,
322 .lookup
= tcf_ipt_search
,
325 static __net_init
int ipt_init_net(struct net
*net
)
327 struct tc_action_net
*tn
= net_generic(net
, ipt_net_id
);
329 return tc_action_net_init(tn
, &act_ipt_ops
, IPT_TAB_MASK
);
332 static void __net_exit
ipt_exit_net(struct net
*net
)
334 struct tc_action_net
*tn
= net_generic(net
, ipt_net_id
);
336 tc_action_net_exit(tn
);
339 static struct pernet_operations ipt_net_ops
= {
340 .init
= ipt_init_net
,
341 .exit
= ipt_exit_net
,
343 .size
= sizeof(struct tc_action_net
),
346 static int tcf_xt_walker(struct net
*net
, struct sk_buff
*skb
,
347 struct netlink_callback
*cb
, int type
,
350 struct tc_action_net
*tn
= net_generic(net
, xt_net_id
);
352 return tcf_generic_walker(tn
, skb
, cb
, type
, a
);
355 static int tcf_xt_search(struct net
*net
, struct tc_action
*a
, u32 index
)
357 struct tc_action_net
*tn
= net_generic(net
, xt_net_id
);
359 return tcf_hash_search(tn
, a
, index
);
362 static struct tc_action_ops act_xt_ops
= {
365 .owner
= THIS_MODULE
,
367 .dump
= tcf_ipt_dump
,
368 .cleanup
= tcf_ipt_release
,
370 .walk
= tcf_xt_walker
,
371 .lookup
= tcf_xt_search
,
374 static __net_init
int xt_init_net(struct net
*net
)
376 struct tc_action_net
*tn
= net_generic(net
, xt_net_id
);
378 return tc_action_net_init(tn
, &act_xt_ops
, IPT_TAB_MASK
);
381 static void __net_exit
xt_exit_net(struct net
*net
)
383 struct tc_action_net
*tn
= net_generic(net
, xt_net_id
);
385 tc_action_net_exit(tn
);
388 static struct pernet_operations xt_net_ops
= {
392 .size
= sizeof(struct tc_action_net
),
395 MODULE_AUTHOR("Jamal Hadi Salim(2002-13)");
396 MODULE_DESCRIPTION("Iptables target actions");
397 MODULE_LICENSE("GPL");
398 MODULE_ALIAS("act_xt");
400 static int __init
ipt_init_module(void)
404 ret1
= tcf_register_action(&act_xt_ops
, &xt_net_ops
);
406 pr_err("Failed to load xt action\n");
408 ret2
= tcf_register_action(&act_ipt_ops
, &ipt_net_ops
);
410 pr_err("Failed to load ipt action\n");
412 if (ret1
< 0 && ret2
< 0) {
418 static void __exit
ipt_cleanup_module(void)
420 tcf_unregister_action(&act_ipt_ops
, &ipt_net_ops
);
421 tcf_unregister_action(&act_xt_ops
, &xt_net_ops
);
424 module_init(ipt_init_module
);
425 module_exit(ipt_cleanup_module
);