Commit | Line | Data |
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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> | |
14 | #include <net/sock.h> | |
15 | ||
16 | #include <linux/netfilter_ipv6/ip6t_owner.h> | |
17 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
18 | ||
19 | MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>"); | |
20 | MODULE_DESCRIPTION("IP6 tables owner matching module"); | |
21 | MODULE_LICENSE("GPL"); | |
22 | ||
1da177e4 LT |
23 | |
24 | static int | |
25 | match(const struct sk_buff *skb, | |
26 | const struct net_device *in, | |
27 | const struct net_device *out, | |
28 | const void *matchinfo, | |
29 | int offset, | |
30 | unsigned int protoff, | |
31 | int *hotdrop) | |
32 | { | |
33 | const struct ip6t_owner_info *info = matchinfo; | |
34 | ||
35 | if (!skb->sk || !skb->sk->sk_socket || !skb->sk->sk_socket->file) | |
36 | return 0; | |
37 | ||
38 | if(info->match & IP6T_OWNER_UID) { | |
39 | if((skb->sk->sk_socket->file->f_uid != info->uid) ^ | |
40 | !!(info->invert & IP6T_OWNER_UID)) | |
41 | return 0; | |
42 | } | |
43 | ||
44 | if(info->match & IP6T_OWNER_GID) { | |
45 | if((skb->sk->sk_socket->file->f_gid != info->gid) ^ | |
46 | !!(info->invert & IP6T_OWNER_GID)) | |
47 | return 0; | |
48 | } | |
49 | ||
1da177e4 LT |
50 | return 1; |
51 | } | |
52 | ||
53 | static int | |
54 | checkentry(const char *tablename, | |
55 | const struct ip6t_ip6 *ip, | |
56 | void *matchinfo, | |
57 | unsigned int matchsize, | |
58 | unsigned int hook_mask) | |
59 | { | |
34b4a4a6 CH |
60 | const struct ip6t_owner_info *info = matchinfo; |
61 | ||
1da177e4 LT |
62 | if (hook_mask |
63 | & ~((1 << NF_IP6_LOCAL_OUT) | (1 << NF_IP6_POST_ROUTING))) { | |
64 | printk("ip6t_owner: only valid for LOCAL_OUT or POST_ROUTING.\n"); | |
65 | return 0; | |
66 | } | |
67 | ||
68 | if (matchsize != IP6T_ALIGN(sizeof(struct ip6t_owner_info))) | |
69 | return 0; | |
34b4a4a6 CH |
70 | |
71 | if (info->match & (IP6T_OWNER_PID|IP6T_OWNER_SID)) { | |
72 | printk("ipt_owner: pid and sid matching " | |
73 | "not supported anymore\n"); | |
1da177e4 LT |
74 | return 0; |
75 | } | |
34b4a4a6 | 76 | |
1da177e4 LT |
77 | return 1; |
78 | } | |
79 | ||
80 | static struct ip6t_match owner_match = { | |
81 | .name = "owner", | |
82 | .match = &match, | |
83 | .checkentry = &checkentry, | |
84 | .me = THIS_MODULE, | |
85 | }; | |
86 | ||
87 | static int __init init(void) | |
88 | { | |
89 | return ip6t_register_match(&owner_match); | |
90 | } | |
91 | ||
92 | static void __exit fini(void) | |
93 | { | |
94 | ip6t_unregister_match(&owner_match); | |
95 | } | |
96 | ||
97 | module_init(init); | |
98 | module_exit(fini); |