1 /* Kernel module to match various things tied to sockets associated with
2 locally generated outgoing packets. */
4 /* (C) 2000 Marc Boucher <marc@mbsi.ca>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 #include <linux/module.h>
12 #include <linux/skbuff.h>
13 #include <linux/file.h>
14 #include <linux/rcupdate.h>
17 #include <linux/netfilter_ipv4/ipt_owner.h>
18 #include <linux/netfilter/x_tables.h>
20 MODULE_LICENSE("GPL");
21 MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
22 MODULE_DESCRIPTION("iptables owner match");
25 owner_mt(const struct sk_buff
*skb
, const struct net_device
*in
,
26 const struct net_device
*out
, const struct xt_match
*match
,
27 const void *matchinfo
, int offset
, unsigned int protoff
,
30 const struct ipt_owner_info
*info
= matchinfo
;
32 if (!skb
->sk
|| !skb
->sk
->sk_socket
|| !skb
->sk
->sk_socket
->file
)
35 if(info
->match
& IPT_OWNER_UID
) {
36 if ((skb
->sk
->sk_socket
->file
->f_uid
!= info
->uid
) ^
37 !!(info
->invert
& IPT_OWNER_UID
))
41 if(info
->match
& IPT_OWNER_GID
) {
42 if ((skb
->sk
->sk_socket
->file
->f_gid
!= info
->gid
) ^
43 !!(info
->invert
& IPT_OWNER_GID
))
51 owner_mt_check(const char *tablename
, const void *ip
,
52 const struct xt_match
*match
, void *matchinfo
,
53 unsigned int hook_mask
)
55 const struct ipt_owner_info
*info
= matchinfo
;
57 if (info
->match
& (IPT_OWNER_PID
|IPT_OWNER_SID
|IPT_OWNER_COMM
)) {
58 printk("ipt_owner: pid, sid and command matching "
59 "not supported anymore\n");
65 static struct xt_match owner_mt_reg __read_mostly
= {
69 .matchsize
= sizeof(struct ipt_owner_info
),
70 .hooks
= (1 << NF_INET_LOCAL_OUT
) |
71 (1 << NF_INET_POST_ROUTING
),
72 .checkentry
= owner_mt_check
,
76 static int __init
owner_mt_init(void)
78 return xt_register_match(&owner_mt_reg
);
81 static void __exit
owner_mt_exit(void)
83 xt_unregister_match(&owner_mt_reg
);
86 module_init(owner_mt_init
);
87 module_exit(owner_mt_exit
);