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 unsigned int ipt_net_id
;
34 static struct tc_action_ops act_ipt_ops
;
36 static unsigned int xt_net_id
;
37 static struct tc_action_ops act_xt_ops
;
39 static int ipt_init_target(struct net
*net
, struct xt_entry_target
*t
,
40 char *table
, unsigned int hook
)
42 struct xt_tgchk_param par
;
43 struct xt_target
*target
;
44 struct ipt_entry e
= {};
47 target
= xt_request_find_target(AF_INET
, t
->u
.user
.name
,
50 return PTR_ERR(target
);
52 t
->u
.kernel
.target
= target
;
53 memset(&par
, 0, sizeof(par
));
58 par
.targinfo
= t
->data
;
60 par
.family
= NFPROTO_IPV4
;
62 ret
= xt_check_target(&par
, t
->u
.target_size
- sizeof(*t
), 0, false);
64 module_put(t
->u
.kernel
.target
->me
);
70 static void ipt_destroy_target(struct xt_entry_target
*t
)
72 struct xt_tgdtor_param par
= {
73 .target
= t
->u
.kernel
.target
,
75 .family
= NFPROTO_IPV4
,
77 if (par
.target
->destroy
!= NULL
)
78 par
.target
->destroy(&par
);
79 module_put(par
.target
->me
);
82 static void tcf_ipt_release(struct tc_action
*a
, int bind
)
84 struct tcf_ipt
*ipt
= to_ipt(a
);
85 ipt_destroy_target(ipt
->tcfi_t
);
86 kfree(ipt
->tcfi_tname
);
90 static const struct nla_policy ipt_policy
[TCA_IPT_MAX
+ 1] = {
91 [TCA_IPT_TABLE
] = { .type
= NLA_STRING
, .len
= IFNAMSIZ
},
92 [TCA_IPT_HOOK
] = { .type
= NLA_U32
},
93 [TCA_IPT_INDEX
] = { .type
= NLA_U32
},
94 [TCA_IPT_TARG
] = { .len
= sizeof(struct xt_entry_target
) },
97 static int __tcf_ipt_init(struct net
*net
, unsigned int id
, struct nlattr
*nla
,
98 struct nlattr
*est
, struct tc_action
**a
,
99 const struct tc_action_ops
*ops
, int ovr
, int bind
)
101 struct tc_action_net
*tn
= net_generic(net
, id
);
102 struct nlattr
*tb
[TCA_IPT_MAX
+ 1];
104 struct xt_entry_target
*td
, *t
;
114 err
= nla_parse_nested(tb
, TCA_IPT_MAX
, nla
, ipt_policy
, NULL
);
118 if (tb
[TCA_IPT_INDEX
] != NULL
)
119 index
= nla_get_u32(tb
[TCA_IPT_INDEX
]);
121 exists
= tcf_hash_check(tn
, index
, a
, bind
);
125 if (tb
[TCA_IPT_HOOK
] == NULL
|| tb
[TCA_IPT_TARG
] == NULL
) {
127 tcf_hash_release(*a
, bind
);
131 td
= (struct xt_entry_target
*)nla_data(tb
[TCA_IPT_TARG
]);
132 if (nla_len(tb
[TCA_IPT_TARG
]) < td
->u
.target_size
) {
134 tcf_hash_release(*a
, bind
);
139 ret
= tcf_hash_create(tn
, index
, est
, a
, ops
, bind
,
145 if (bind
)/* dont override defaults */
147 tcf_hash_release(*a
, bind
);
152 hook
= nla_get_u32(tb
[TCA_IPT_HOOK
]);
155 tname
= kmalloc(IFNAMSIZ
, GFP_KERNEL
);
156 if (unlikely(!tname
))
158 if (tb
[TCA_IPT_TABLE
] == NULL
||
159 nla_strlcpy(tname
, tb
[TCA_IPT_TABLE
], IFNAMSIZ
) >= IFNAMSIZ
)
160 strcpy(tname
, "mangle");
162 t
= kmemdup(td
, td
->u
.target_size
, GFP_KERNEL
);
166 err
= ipt_init_target(net
, t
, tname
, hook
);
172 spin_lock_bh(&ipt
->tcf_lock
);
173 if (ret
!= ACT_P_CREATED
) {
174 ipt_destroy_target(ipt
->tcfi_t
);
175 kfree(ipt
->tcfi_tname
);
178 ipt
->tcfi_tname
= tname
;
180 ipt
->tcfi_hook
= hook
;
181 spin_unlock_bh(&ipt
->tcf_lock
);
182 if (ret
== ACT_P_CREATED
)
183 tcf_hash_insert(tn
, *a
);
191 if (ret
== ACT_P_CREATED
)
192 tcf_hash_cleanup(*a
, est
);
196 static int tcf_ipt_init(struct net
*net
, struct nlattr
*nla
,
197 struct nlattr
*est
, struct tc_action
**a
, int ovr
,
200 return __tcf_ipt_init(net
, ipt_net_id
, nla
, est
, a
, &act_ipt_ops
, ovr
,
204 static int tcf_xt_init(struct net
*net
, struct nlattr
*nla
,
205 struct nlattr
*est
, struct tc_action
**a
, int ovr
,
208 return __tcf_ipt_init(net
, xt_net_id
, nla
, est
, a
, &act_xt_ops
, ovr
,
212 static int tcf_ipt(struct sk_buff
*skb
, const struct tc_action
*a
,
213 struct tcf_result
*res
)
215 int ret
= 0, result
= 0;
216 struct tcf_ipt
*ipt
= to_ipt(a
);
217 struct xt_action_param par
;
218 struct nf_hook_state state
= {
219 .net
= dev_net(skb
->dev
),
221 .hook
= ipt
->tcfi_hook
,
225 if (skb_unclone(skb
, GFP_ATOMIC
))
226 return TC_ACT_UNSPEC
;
228 spin_lock(&ipt
->tcf_lock
);
230 tcf_lastuse_update(&ipt
->tcf_tm
);
231 bstats_update(&ipt
->tcf_bstats
, skb
);
233 /* yes, we have to worry about both in and out dev
234 * worry later - danger - this API seems to have changed
235 * from earlier kernels
238 par
.target
= ipt
->tcfi_t
->u
.kernel
.target
;
239 par
.targinfo
= ipt
->tcfi_t
->data
;
240 ret
= par
.target
->target(skb
, &par
);
247 result
= TC_ACT_SHOT
;
248 ipt
->tcf_qstats
.drops
++;
251 result
= TC_ACT_PIPE
;
254 net_notice_ratelimited("tc filter: Bogus netfilter code %d assume ACCEPT\n",
259 spin_unlock(&ipt
->tcf_lock
);
264 static int tcf_ipt_dump(struct sk_buff
*skb
, struct tc_action
*a
, int bind
,
267 unsigned char *b
= skb_tail_pointer(skb
);
268 struct tcf_ipt
*ipt
= to_ipt(a
);
269 struct xt_entry_target
*t
;
273 /* for simple targets kernel size == user size
274 * user name = target name
275 * for foolproof you need to not assume this
278 t
= kmemdup(ipt
->tcfi_t
, ipt
->tcfi_t
->u
.user
.target_size
, GFP_ATOMIC
);
280 goto nla_put_failure
;
282 c
.bindcnt
= ipt
->tcf_bindcnt
- bind
;
283 c
.refcnt
= ipt
->tcf_refcnt
- ref
;
284 strcpy(t
->u
.user
.name
, ipt
->tcfi_t
->u
.kernel
.target
->name
);
286 if (nla_put(skb
, TCA_IPT_TARG
, ipt
->tcfi_t
->u
.user
.target_size
, t
) ||
287 nla_put_u32(skb
, TCA_IPT_INDEX
, ipt
->tcf_index
) ||
288 nla_put_u32(skb
, TCA_IPT_HOOK
, ipt
->tcfi_hook
) ||
289 nla_put(skb
, TCA_IPT_CNT
, sizeof(struct tc_cnt
), &c
) ||
290 nla_put_string(skb
, TCA_IPT_TABLE
, ipt
->tcfi_tname
))
291 goto nla_put_failure
;
293 tcf_tm_dump(&tm
, &ipt
->tcf_tm
);
294 if (nla_put_64bit(skb
, TCA_IPT_TM
, sizeof(tm
), &tm
, TCA_IPT_PAD
))
295 goto nla_put_failure
;
306 static int tcf_ipt_walker(struct net
*net
, struct sk_buff
*skb
,
307 struct netlink_callback
*cb
, int type
,
308 const struct tc_action_ops
*ops
)
310 struct tc_action_net
*tn
= net_generic(net
, ipt_net_id
);
312 return tcf_generic_walker(tn
, skb
, cb
, type
, ops
);
315 static int tcf_ipt_search(struct net
*net
, struct tc_action
**a
, u32 index
)
317 struct tc_action_net
*tn
= net_generic(net
, ipt_net_id
);
319 return tcf_hash_search(tn
, a
, index
);
322 static struct tc_action_ops act_ipt_ops
= {
325 .owner
= THIS_MODULE
,
327 .dump
= tcf_ipt_dump
,
328 .cleanup
= tcf_ipt_release
,
329 .init
= tcf_ipt_init
,
330 .walk
= tcf_ipt_walker
,
331 .lookup
= tcf_ipt_search
,
332 .size
= sizeof(struct tcf_ipt
),
335 static __net_init
int ipt_init_net(struct net
*net
)
337 struct tc_action_net
*tn
= net_generic(net
, ipt_net_id
);
339 return tc_action_net_init(tn
, &act_ipt_ops
, IPT_TAB_MASK
);
342 static void __net_exit
ipt_exit_net(struct net
*net
)
344 struct tc_action_net
*tn
= net_generic(net
, ipt_net_id
);
346 tc_action_net_exit(tn
);
349 static struct pernet_operations ipt_net_ops
= {
350 .init
= ipt_init_net
,
351 .exit
= ipt_exit_net
,
353 .size
= sizeof(struct tc_action_net
),
356 static int tcf_xt_walker(struct net
*net
, struct sk_buff
*skb
,
357 struct netlink_callback
*cb
, int type
,
358 const struct tc_action_ops
*ops
)
360 struct tc_action_net
*tn
= net_generic(net
, xt_net_id
);
362 return tcf_generic_walker(tn
, skb
, cb
, type
, ops
);
365 static int tcf_xt_search(struct net
*net
, struct tc_action
**a
, u32 index
)
367 struct tc_action_net
*tn
= net_generic(net
, xt_net_id
);
369 return tcf_hash_search(tn
, a
, index
);
372 static struct tc_action_ops act_xt_ops
= {
375 .owner
= THIS_MODULE
,
377 .dump
= tcf_ipt_dump
,
378 .cleanup
= tcf_ipt_release
,
380 .walk
= tcf_xt_walker
,
381 .lookup
= tcf_xt_search
,
382 .size
= sizeof(struct tcf_ipt
),
385 static __net_init
int xt_init_net(struct net
*net
)
387 struct tc_action_net
*tn
= net_generic(net
, xt_net_id
);
389 return tc_action_net_init(tn
, &act_xt_ops
, IPT_TAB_MASK
);
392 static void __net_exit
xt_exit_net(struct net
*net
)
394 struct tc_action_net
*tn
= net_generic(net
, xt_net_id
);
396 tc_action_net_exit(tn
);
399 static struct pernet_operations xt_net_ops
= {
403 .size
= sizeof(struct tc_action_net
),
406 MODULE_AUTHOR("Jamal Hadi Salim(2002-13)");
407 MODULE_DESCRIPTION("Iptables target actions");
408 MODULE_LICENSE("GPL");
409 MODULE_ALIAS("act_xt");
411 static int __init
ipt_init_module(void)
415 ret1
= tcf_register_action(&act_xt_ops
, &xt_net_ops
);
417 pr_err("Failed to load xt action\n");
419 ret2
= tcf_register_action(&act_ipt_ops
, &ipt_net_ops
);
421 pr_err("Failed to load ipt action\n");
423 if (ret1
< 0 && ret2
< 0) {
429 static void __exit
ipt_cleanup_module(void)
431 tcf_unregister_action(&act_ipt_ops
, &ipt_net_ops
);
432 tcf_unregister_action(&act_xt_ops
, &xt_net_ops
);
435 module_init(ipt_init_module
);
436 module_exit(ipt_cleanup_module
);