| /* Kernel module to match various things tied to sockets associated with |
| locally generated outgoing packets. */ |
| |
| /* (C) 2000 Marc Boucher <marc@mbsi.ca> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/skbuff.h> |
| #include <linux/file.h> |
| #include <linux/rcupdate.h> |
| #include <net/sock.h> |
| |
| #include <linux/netfilter_ipv4/ipt_owner.h> |
| #include <linux/netfilter/x_tables.h> |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>"); |
| MODULE_DESCRIPTION("iptables owner match"); |
| |
| static bool |
| match(const struct sk_buff *skb, |
| const struct net_device *in, |
| const struct net_device *out, |
| const struct xt_match *match, |
| const void *matchinfo, |
| int offset, |
| unsigned int protoff, |
| bool *hotdrop) |
| { |
| const struct ipt_owner_info *info = matchinfo; |
| |
| if (!skb->sk || !skb->sk->sk_socket || !skb->sk->sk_socket->file) |
| return false; |
| |
| if(info->match & IPT_OWNER_UID) { |
| if ((skb->sk->sk_socket->file->f_uid != info->uid) ^ |
| !!(info->invert & IPT_OWNER_UID)) |
| return false; |
| } |
| |
| if(info->match & IPT_OWNER_GID) { |
| if ((skb->sk->sk_socket->file->f_gid != info->gid) ^ |
| !!(info->invert & IPT_OWNER_GID)) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| static bool |
| checkentry(const char *tablename, |
| const void *ip, |
| const struct xt_match *match, |
| void *matchinfo, |
| unsigned int hook_mask) |
| { |
| const struct ipt_owner_info *info = matchinfo; |
| |
| if (info->match & (IPT_OWNER_PID|IPT_OWNER_SID|IPT_OWNER_COMM)) { |
| printk("ipt_owner: pid, sid and command matching " |
| "not supported anymore\n"); |
| return false; |
| } |
| return true; |
| } |
| |
| static struct xt_match owner_match __read_mostly = { |
| .name = "owner", |
| .family = AF_INET, |
| .match = match, |
| .matchsize = sizeof(struct ipt_owner_info), |
| .hooks = (1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_POST_ROUTING), |
| .checkentry = checkentry, |
| .me = THIS_MODULE, |
| }; |
| |
| static int __init ipt_owner_init(void) |
| { |
| return xt_register_match(&owner_match); |
| } |
| |
| static void __exit ipt_owner_fini(void) |
| { |
| xt_unregister_match(&owner_match); |
| } |
| |
| module_init(ipt_owner_init); |
| module_exit(ipt_owner_fini); |