2 * net/sched/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 (2002-4)
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 <net/netlink.h>
23 #include <net/pkt_sched.h>
24 #include <linux/tc_act/tc_ipt.h>
25 #include <net/tc_act/tc_ipt.h>
27 #include <linux/netfilter_ipv4/ip_tables.h>
30 #define IPT_TAB_MASK 15
31 static struct tcf_common
*tcf_ipt_ht
[IPT_TAB_MASK
+ 1];
32 static u32 ipt_idx_gen
;
33 static DEFINE_RWLOCK(ipt_lock
);
35 static struct tcf_hashinfo ipt_hash_info
= {
37 .hmask
= IPT_TAB_MASK
,
41 static int ipt_init_target(struct ipt_entry_target
*t
, char *table
, unsigned int hook
)
43 struct xt_target
*target
;
46 target
= xt_request_find_target(AF_INET
, t
->u
.user
.name
,
51 t
->u
.kernel
.target
= target
;
53 ret
= xt_check_target(target
, AF_INET
, t
->u
.target_size
- sizeof(*t
),
54 table
, hook
, 0, 0, NULL
, t
->data
);
56 module_put(t
->u
.kernel
.target
->me
);
62 static void ipt_destroy_target(struct ipt_entry_target
*t
)
64 if (t
->u
.kernel
.target
->destroy
)
65 t
->u
.kernel
.target
->destroy(t
->u
.kernel
.target
, t
->data
);
66 module_put(t
->u
.kernel
.target
->me
);
69 static int tcf_ipt_release(struct tcf_ipt
*ipt
, int bind
)
76 if (ipt
->tcf_bindcnt
<= 0 && ipt
->tcf_refcnt
<= 0) {
77 ipt_destroy_target(ipt
->tcfi_t
);
78 kfree(ipt
->tcfi_tname
);
80 tcf_hash_destroy(&ipt
->common
, &ipt_hash_info
);
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
) },
94 static int tcf_ipt_init(struct nlattr
*nla
, struct nlattr
*est
,
95 struct tc_action
*a
, int ovr
, int bind
)
97 struct nlattr
*tb
[TCA_IPT_MAX
+ 1];
99 struct tcf_common
*pc
;
100 struct ipt_entry_target
*td
, *t
;
109 err
= nla_parse_nested(tb
, TCA_IPT_MAX
, nla
, ipt_policy
);
113 if (tb
[TCA_IPT_HOOK
] == NULL
)
115 if (tb
[TCA_IPT_TARG
] == NULL
)
118 td
= (struct ipt_entry_target
*)nla_data(tb
[TCA_IPT_TARG
]);
119 if (nla_len(tb
[TCA_IPT_TARG
]) < td
->u
.target_size
)
122 if (tb
[TCA_IPT_INDEX
] != NULL
)
123 index
= nla_get_u32(tb
[TCA_IPT_INDEX
]);
125 pc
= tcf_hash_check(index
, a
, bind
, &ipt_hash_info
);
127 pc
= tcf_hash_create(index
, est
, a
, sizeof(*ipt
), bind
,
128 &ipt_idx_gen
, &ipt_hash_info
);
134 tcf_ipt_release(to_ipt(pc
), bind
);
140 hook
= nla_get_u32(tb
[TCA_IPT_HOOK
]);
143 tname
= kmalloc(IFNAMSIZ
, GFP_KERNEL
);
144 if (unlikely(!tname
))
146 if (tb
[TCA_IPT_TABLE
] == NULL
||
147 nla_strlcpy(tname
, tb
[TCA_IPT_TABLE
], IFNAMSIZ
) >= IFNAMSIZ
)
148 strcpy(tname
, "mangle");
150 t
= kmemdup(td
, td
->u
.target_size
, GFP_KERNEL
);
154 if ((err
= ipt_init_target(t
, tname
, hook
)) < 0)
157 spin_lock_bh(&ipt
->tcf_lock
);
158 if (ret
!= ACT_P_CREATED
) {
159 ipt_destroy_target(ipt
->tcfi_t
);
160 kfree(ipt
->tcfi_tname
);
163 ipt
->tcfi_tname
= tname
;
165 ipt
->tcfi_hook
= hook
;
166 spin_unlock_bh(&ipt
->tcf_lock
);
167 if (ret
== ACT_P_CREATED
)
168 tcf_hash_insert(pc
, &ipt_hash_info
);
180 static int tcf_ipt_cleanup(struct tc_action
*a
, int bind
)
182 struct tcf_ipt
*ipt
= a
->priv
;
183 return tcf_ipt_release(ipt
, bind
);
186 static int tcf_ipt(struct sk_buff
*skb
, struct tc_action
*a
,
187 struct tcf_result
*res
)
189 int ret
= 0, result
= 0;
190 struct tcf_ipt
*ipt
= a
->priv
;
191 struct xt_target_param par
;
193 if (skb_cloned(skb
)) {
194 if (pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
))
195 return TC_ACT_UNSPEC
;
198 spin_lock(&ipt
->tcf_lock
);
200 ipt
->tcf_tm
.lastuse
= jiffies
;
201 ipt
->tcf_bstats
.bytes
+= qdisc_pkt_len(skb
);
202 ipt
->tcf_bstats
.packets
++;
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 */
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
);
219 result
= TC_ACT_SHOT
;
220 ipt
->tcf_qstats
.drops
++;
223 result
= TC_ACT_PIPE
;
227 printk("Bogus netfilter code %d assume ACCEPT\n", ret
);
228 result
= TC_POLICE_OK
;
231 spin_unlock(&ipt
->tcf_lock
);
236 static int tcf_ipt_dump(struct sk_buff
*skb
, struct tc_action
*a
, int bind
, int ref
)
238 unsigned char *b
= skb_tail_pointer(skb
);
239 struct tcf_ipt
*ipt
= a
->priv
;
240 struct ipt_entry_target
*t
;
244 /* for simple targets kernel size == user size
245 ** user name = target name
246 ** for foolproof you need to not assume this
249 t
= kmemdup(ipt
->tcfi_t
, ipt
->tcfi_t
->u
.user
.target_size
, GFP_ATOMIC
);
251 goto nla_put_failure
;
253 c
.bindcnt
= ipt
->tcf_bindcnt
- bind
;
254 c
.refcnt
= ipt
->tcf_refcnt
- ref
;
255 strcpy(t
->u
.user
.name
, ipt
->tcfi_t
->u
.kernel
.target
->name
);
257 NLA_PUT(skb
, TCA_IPT_TARG
, ipt
->tcfi_t
->u
.user
.target_size
, t
);
258 NLA_PUT_U32(skb
, TCA_IPT_INDEX
, ipt
->tcf_index
);
259 NLA_PUT_U32(skb
, TCA_IPT_HOOK
, ipt
->tcfi_hook
);
260 NLA_PUT(skb
, TCA_IPT_CNT
, sizeof(struct tc_cnt
), &c
);
261 NLA_PUT_STRING(skb
, TCA_IPT_TABLE
, ipt
->tcfi_tname
);
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
);
265 NLA_PUT(skb
, TCA_IPT_TM
, sizeof (tm
), &tm
);
275 static struct tc_action_ops act_ipt_ops
= {
277 .hinfo
= &ipt_hash_info
,
279 .capab
= TCA_CAP_NONE
,
280 .owner
= THIS_MODULE
,
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
289 MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
290 MODULE_DESCRIPTION("Iptables target actions");
291 MODULE_LICENSE("GPL");
293 static int __init
ipt_init_module(void)
295 return tcf_register_action(&act_ipt_ops
);
298 static void __exit
ipt_cleanup_module(void)
300 tcf_unregister_action(&act_ipt_ops
);
303 module_init(ipt_init_module
);
304 module_exit(ipt_cleanup_module
);