projects / deliverable / linux.git / blame
| 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> | |
| 14 | #include <net/sock.h> | |
| 15 | ||
| 16 | #include <linux/netfilter_ipv4/ipt_owner.h> | |
| 17 | #include <linux/netfilter_ipv4/ip_tables.h> | |
| 18 | ||
| 19 | MODULE_LICENSE("GPL"); | |
| 20 | MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>"); | |
| 21 | MODULE_DESCRIPTION("iptables owner match"); | |
| 22 | ||
| 1da177e4 LT |
23 | static int |
| 24 | match(const struct sk_buff *skb, | |
| 25 | const struct net_device *in, | |
| 26 | const struct net_device *out, | |
| 27 | const void *matchinfo, | |
| 28 | int offset, | |
| 29 | int *hotdrop) | |
| 30 | { | |
| 31 | const struct ipt_owner_info *info = matchinfo; | |
| 32 | ||
| 33 | if (!skb->sk || !skb->sk->sk_socket || !skb->sk->sk_socket->file) | |
| 34 | return 0; | |
| 35 | ||
| 36 | if(info->match & IPT_OWNER_UID) { | |
| 37 | if ((skb->sk->sk_socket->file->f_uid != info->uid) ^ | |
| 38 | !!(info->invert & IPT_OWNER_UID)) | |
| 39 | return 0; | |
| 40 | } | |
| 41 | ||
| 42 | if(info->match & IPT_OWNER_GID) { | |
| 43 | if ((skb->sk->sk_socket->file->f_gid != info->gid) ^ | |
| 44 | !!(info->invert & IPT_OWNER_GID)) | |
| 45 | return 0; | |
| 46 | } | |
| 47 | ||
| 1da177e4 LT |
48 | return 1; |
| 49 | } | |
| 50 | ||
| 51 | static int | |
| 52 | checkentry(const char *tablename, | |
| 53 | const struct ipt_ip *ip, | |
| 54 | void *matchinfo, | |
| 55 | unsigned int matchsize, | |
| 56 | unsigned int hook_mask) | |
| 57 | { | |
| 34b4a4a6 CH |
58 | const struct ipt_owner_info *info = matchinfo; |
| 59 | ||
| 1da177e4 LT |
60 | if (hook_mask |
| 61 | & ~((1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_POST_ROUTING))) { | |
| 62 | printk("ipt_owner: only valid for LOCAL_OUT or POST_ROUTING.\n"); | |
| 63 | return 0; | |
| 64 | } | |
| 65 | ||
| 66 | if (matchsize != IPT_ALIGN(sizeof(struct ipt_owner_info))) { | |
| 67 | printk("Matchsize %u != %Zu\n", matchsize, | |
| 68 | IPT_ALIGN(sizeof(struct ipt_owner_info))); | |
| 69 | return 0; | |
| 70 | } | |
| 34b4a4a6 CH |
71 | |
| 72 | if (info->match & (IPT_OWNER_PID|IPT_OWNER_SID|IPT_OWNER_COMM)) { | |
| 73 | printk("ipt_owner: pid, sid and command matching " | |
| 74 | "not supported anymore\n"); | |
| 1da177e4 LT |
75 | return 0; |
| 76 | } | |
| 34b4a4a6 | 77 | |
| 1da177e4 LT |
78 | return 1; |
| 79 | } | |
| 80 | ||
| 81 | static struct ipt_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 ipt_register_match(&owner_match); | |
| 91 | } | |
| 92 | ||
| 93 | static void __exit fini(void) | |
| 94 | { | |
| 95 | ipt_unregister_match(&owner_match); | |
| 96 | } | |
| 97 | ||
| 98 | module_init(init); | |
| 99 | module_exit(fini); |