]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* Kernel module to match various things tied to sockets associated with |
2 | locally generated outgoing packets. */ | |
3 | ||
4 | /* (C) 2000-2001 Marc Boucher <marc@mbsi.ca> | |
5 | * | |
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. | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/skbuff.h> | |
13 | #include <linux/file.h> | |
b835996f | 14 | #include <linux/rcupdate.h> |
1da177e4 LT |
15 | #include <net/sock.h> |
16 | ||
17 | #include <linux/netfilter_ipv6/ip6t_owner.h> | |
18 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
19 | ||
20 | MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>"); | |
21 | MODULE_DESCRIPTION("IP6 tables owner matching module"); | |
22 | MODULE_LICENSE("GPL"); | |
23 | ||
1da177e4 LT |
24 | |
25 | static int | |
26 | match(const struct sk_buff *skb, | |
27 | const struct net_device *in, | |
28 | const struct net_device *out, | |
29 | const void *matchinfo, | |
30 | int offset, | |
31 | unsigned int protoff, | |
32 | int *hotdrop) | |
33 | { | |
34 | const struct ip6t_owner_info *info = matchinfo; | |
35 | ||
36 | if (!skb->sk || !skb->sk->sk_socket || !skb->sk->sk_socket->file) | |
37 | return 0; | |
38 | ||
f0daaa65 YK |
39 | if (info->match & IP6T_OWNER_UID) { |
40 | if ((skb->sk->sk_socket->file->f_uid != info->uid) ^ | |
1da177e4 LT |
41 | !!(info->invert & IP6T_OWNER_UID)) |
42 | return 0; | |
43 | } | |
44 | ||
f0daaa65 YK |
45 | if (info->match & IP6T_OWNER_GID) { |
46 | if ((skb->sk->sk_socket->file->f_gid != info->gid) ^ | |
1da177e4 LT |
47 | !!(info->invert & IP6T_OWNER_GID)) |
48 | return 0; | |
49 | } | |
50 | ||
1da177e4 LT |
51 | return 1; |
52 | } | |
53 | ||
54 | static int | |
55 | checkentry(const char *tablename, | |
f0daaa65 YK |
56 | const void *ip, |
57 | void *matchinfo, | |
58 | unsigned int matchsize, | |
59 | unsigned int hook_mask) | |
1da177e4 | 60 | { |
34b4a4a6 CH |
61 | const struct ip6t_owner_info *info = matchinfo; |
62 | ||
f0daaa65 YK |
63 | if (hook_mask |
64 | & ~((1 << NF_IP6_LOCAL_OUT) | (1 << NF_IP6_POST_ROUTING))) { | |
65 | printk("ip6t_owner: only valid for LOCAL_OUT or POST_ROUTING.\n"); | |
66 | return 0; | |
67 | } | |
1da177e4 LT |
68 | |
69 | if (matchsize != IP6T_ALIGN(sizeof(struct ip6t_owner_info))) | |
70 | return 0; | |
34b4a4a6 | 71 | |
f0daaa65 | 72 | if (info->match & (IP6T_OWNER_PID | IP6T_OWNER_SID)) { |
34b4a4a6 CH |
73 | printk("ipt_owner: pid and sid matching " |
74 | "not supported anymore\n"); | |
1da177e4 LT |
75 | return 0; |
76 | } | |
34b4a4a6 | 77 | |
1da177e4 LT |
78 | return 1; |
79 | } | |
80 | ||
81 | static struct ip6t_match owner_match = { | |
82 | .name = "owner", | |
83 | .match = &match, | |
84 | .checkentry = &checkentry, | |
85 | .me = THIS_MODULE, | |
86 | }; | |
87 | ||
88 | static int __init init(void) | |
89 | { | |
90 | return ip6t_register_match(&owner_match); | |
91 | } | |
92 | ||
93 | static void __exit fini(void) | |
94 | { | |
95 | ip6t_unregister_match(&owner_match); | |
96 | } | |
97 | ||
98 | module_init(init); | |
99 | module_exit(fini); |