2005-04-16 22:20:36 +00:00
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/* Kernel module to match various things tied to sockets associated with
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locally generated outgoing packets. */
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/* (C) 2000 Marc Boucher <marc@mbsi.ca>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/file.h>
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2005-09-09 20:04:14 +00:00
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#include <linux/rcupdate.h>
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2005-04-16 22:20:36 +00:00
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#include <net/sock.h>
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#include <linux/netfilter_ipv4/ipt_owner.h>
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#include <linux/netfilter_ipv4/ip_tables.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
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MODULE_DESCRIPTION("iptables owner match");
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static int
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match(const struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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const void *matchinfo,
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int offset,
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int *hotdrop)
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{
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const struct ipt_owner_info *info = matchinfo;
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if (!skb->sk || !skb->sk->sk_socket || !skb->sk->sk_socket->file)
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return 0;
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if(info->match & IPT_OWNER_UID) {
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if ((skb->sk->sk_socket->file->f_uid != info->uid) ^
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!!(info->invert & IPT_OWNER_UID))
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return 0;
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}
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if(info->match & IPT_OWNER_GID) {
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if ((skb->sk->sk_socket->file->f_gid != info->gid) ^
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!!(info->invert & IPT_OWNER_GID))
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return 0;
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}
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return 1;
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}
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static int
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checkentry(const char *tablename,
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const struct ipt_ip *ip,
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void *matchinfo,
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unsigned int matchsize,
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unsigned int hook_mask)
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{
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2005-08-15 00:33:59 +00:00
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const struct ipt_owner_info *info = matchinfo;
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2005-04-16 22:20:36 +00:00
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if (hook_mask
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& ~((1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_POST_ROUTING))) {
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printk("ipt_owner: only valid for LOCAL_OUT or POST_ROUTING.\n");
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return 0;
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}
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if (matchsize != IPT_ALIGN(sizeof(struct ipt_owner_info))) {
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printk("Matchsize %u != %Zu\n", matchsize,
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IPT_ALIGN(sizeof(struct ipt_owner_info)));
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return 0;
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}
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2005-08-15 00:33:59 +00:00
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if (info->match & (IPT_OWNER_PID|IPT_OWNER_SID|IPT_OWNER_COMM)) {
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printk("ipt_owner: pid, sid and command matching "
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"not supported anymore\n");
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2005-04-16 22:20:36 +00:00
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return 0;
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}
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2005-08-15 00:33:59 +00:00
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2005-04-16 22:20:36 +00:00
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return 1;
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}
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static struct ipt_match owner_match = {
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.name = "owner",
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.match = &match,
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.checkentry = &checkentry,
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.me = THIS_MODULE,
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};
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static int __init init(void)
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{
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return ipt_register_match(&owner_match);
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}
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static void __exit fini(void)
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{
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ipt_unregister_match(&owner_match);
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}
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module_init(init);
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module_exit(fini);
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