diff options
Diffstat (limited to 'net/ipv4/netfilter/ipt_realm.c')
-rw-r--r-- | net/ipv4/netfilter/ipt_realm.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/net/ipv4/netfilter/ipt_realm.c b/net/ipv4/netfilter/ipt_realm.c new file mode 100644 index 000000000000..54a6897ebaa6 --- /dev/null +++ b/net/ipv4/netfilter/ipt_realm.c @@ -0,0 +1,76 @@ +/* IP tables module for matching the routing realm + * + * $Id: ipt_realm.c,v 1.3 2004/03/05 13:25:40 laforge Exp $ + * + * (C) 2003 by Sampsa Ranta <sampsa@netsonic.fi> + * + * 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/netdevice.h> +#include <net/route.h> + +#include <linux/netfilter_ipv4/ipt_realm.h> +#include <linux/netfilter_ipv4/ip_tables.h> + +MODULE_AUTHOR("Sampsa Ranta <sampsa@netsonic.fi>"); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("iptables realm match"); + +static int +match(const struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + const void *matchinfo, + int offset, + int *hotdrop) +{ + const struct ipt_realm_info *info = matchinfo; + struct dst_entry *dst = skb->dst; + + return (info->id == (dst->tclassid & info->mask)) ^ info->invert; +} + +static int check(const char *tablename, + const struct ipt_ip *ip, + void *matchinfo, + unsigned int matchsize, + unsigned int hook_mask) +{ + if (hook_mask + & ~((1 << NF_IP_POST_ROUTING) | (1 << NF_IP_FORWARD) | + (1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_LOCAL_IN))) { + printk("ipt_realm: only valid for POST_ROUTING, LOCAL_OUT, " + "LOCAL_IN or FORWARD.\n"); + return 0; + } + if (matchsize != IPT_ALIGN(sizeof(struct ipt_realm_info))) { + printk("ipt_realm: invalid matchsize.\n"); + return 0; + } + return 1; +} + +static struct ipt_match realm_match = { + .name = "realm", + .match = match, + .checkentry = check, + .me = THIS_MODULE +}; + +static int __init init(void) +{ + return ipt_register_match(&realm_match); +} + +static void __exit fini(void) +{ + ipt_unregister_match(&realm_match); +} + +module_init(init); +module_exit(fini); |