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 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_ipv4/ipt_owner.h> | |
6709dbbb | 18 | #include <linux/netfilter/x_tables.h> |
1da177e4 LT |
19 | |
20 | MODULE_LICENSE("GPL"); | |
21 | MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>"); | |
22 | MODULE_DESCRIPTION("iptables owner match"); | |
23 | ||
1d93a9cb | 24 | static bool |
1da177e4 LT |
25 | match(const struct sk_buff *skb, |
26 | const struct net_device *in, | |
27 | const struct net_device *out, | |
c4986734 | 28 | const struct xt_match *match, |
1da177e4 LT |
29 | const void *matchinfo, |
30 | int offset, | |
2e4e6a17 | 31 | unsigned int protoff, |
cff533ac | 32 | bool *hotdrop) |
1da177e4 LT |
33 | { |
34 | const struct ipt_owner_info *info = matchinfo; | |
35 | ||
36 | if (!skb->sk || !skb->sk->sk_socket || !skb->sk->sk_socket->file) | |
1d93a9cb | 37 | return false; |
1da177e4 LT |
38 | |
39 | if(info->match & IPT_OWNER_UID) { | |
40 | if ((skb->sk->sk_socket->file->f_uid != info->uid) ^ | |
41 | !!(info->invert & IPT_OWNER_UID)) | |
1d93a9cb | 42 | return false; |
1da177e4 LT |
43 | } |
44 | ||
45 | if(info->match & IPT_OWNER_GID) { | |
46 | if ((skb->sk->sk_socket->file->f_gid != info->gid) ^ | |
47 | !!(info->invert & IPT_OWNER_GID)) | |
1d93a9cb | 48 | return false; |
1da177e4 LT |
49 | } |
50 | ||
1d93a9cb | 51 | return true; |
1da177e4 LT |
52 | } |
53 | ||
ccb79bdc | 54 | static bool |
1da177e4 | 55 | checkentry(const char *tablename, |
e905a9ed | 56 | const void *ip, |
c4986734 | 57 | const struct xt_match *match, |
e905a9ed YH |
58 | void *matchinfo, |
59 | unsigned int hook_mask) | |
1da177e4 | 60 | { |
34b4a4a6 CH |
61 | const struct ipt_owner_info *info = matchinfo; |
62 | ||
34b4a4a6 CH |
63 | if (info->match & (IPT_OWNER_PID|IPT_OWNER_SID|IPT_OWNER_COMM)) { |
64 | printk("ipt_owner: pid, sid and command matching " | |
65 | "not supported anymore\n"); | |
ccb79bdc | 66 | return false; |
1da177e4 | 67 | } |
ccb79bdc | 68 | return true; |
1da177e4 LT |
69 | } |
70 | ||
9f15c530 | 71 | static struct xt_match owner_match __read_mostly = { |
1da177e4 | 72 | .name = "owner", |
6709dbbb | 73 | .family = AF_INET, |
1d5cd909 PM |
74 | .match = match, |
75 | .matchsize = sizeof(struct ipt_owner_info), | |
6e23ae2a PM |
76 | .hooks = (1 << NF_INET_LOCAL_OUT) | |
77 | (1 << NF_INET_POST_ROUTING), | |
1d5cd909 | 78 | .checkentry = checkentry, |
1da177e4 LT |
79 | .me = THIS_MODULE, |
80 | }; | |
81 | ||
65b4b4e8 | 82 | static int __init ipt_owner_init(void) |
1da177e4 | 83 | { |
6709dbbb | 84 | return xt_register_match(&owner_match); |
1da177e4 LT |
85 | } |
86 | ||
65b4b4e8 | 87 | static void __exit ipt_owner_fini(void) |
1da177e4 | 88 | { |
6709dbbb | 89 | xt_unregister_match(&owner_match); |
1da177e4 LT |
90 | } |
91 | ||
65b4b4e8 AM |
92 | module_init(ipt_owner_init); |
93 | module_exit(ipt_owner_fini); |