diff options
Diffstat (limited to 'net/netfilter/xt_realm.c')
-rw-r--r-- | net/netfilter/xt_realm.c | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/net/netfilter/xt_realm.c b/net/netfilter/xt_realm.c new file mode 100644 index 000000000000..2b7e1781d34d --- /dev/null +++ b/net/netfilter/xt_realm.c @@ -0,0 +1,79 @@ +/* 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.h> +#include <linux/netfilter/xt_realm.h> +#include <linux/netfilter/x_tables.h> + +MODULE_AUTHOR("Sampsa Ranta <sampsa@netsonic.fi>"); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("X_tables realm match"); +MODULE_ALIAS("ipt_realm"); + +static int +match(const struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + const void *matchinfo, + int offset, + unsigned int protoff, + int *hotdrop) +{ + const struct xt_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 void *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("xt_realm: only valid for POST_ROUTING, LOCAL_OUT, " + "LOCAL_IN or FORWARD.\n"); + return 0; + } + if (matchsize != XT_ALIGN(sizeof(struct xt_realm_info))) { + printk("xt_realm: invalid matchsize.\n"); + return 0; + } + return 1; +} + +static struct xt_match realm_match = { + .name = "realm", + .match = match, + .checkentry = check, + .me = THIS_MODULE +}; + +static int __init init(void) +{ + return xt_register_match(AF_INET, &realm_match); +} + +static void __exit fini(void) +{ + xt_unregister_match(AF_INET, &realm_match); +} + +module_init(init); +module_exit(fini); |