From 2e4e6a17af35be359cc8f1c924f8f198fbd478cc Mon Sep 17 00:00:00 2001 From: Harald Welte Date: Thu, 12 Jan 2006 13:30:04 -0800 Subject: [NETFILTER] x_tables: Abstraction layer for {ip,ip6,arp}_tables This monster-patch tries to do the best job for unifying the data structures and backend interfaces for the three evil clones ip_tables, ip6_tables and arp_tables. In an ideal world we would never have allowed this kind of copy+paste programming... but well, our world isn't (yet?) ideal. o introduce a new x_tables module o {ip,arp,ip6}_tables depend on this x_tables module o registration functions for tables, matches and targets are only wrappers around x_tables provided functions o all matches/targets that are used from ip_tables and ip6_tables are now implemented as xt_FOOBAR.c files and provide module aliases to ipt_FOOBAR and ip6t_FOOBAR o header files for xt_matches are in include/linux/netfilter/, include/linux/netfilter_{ipv4,ipv6} contains compatibility wrappers around the xt_FOOBAR.h headers Based on this patchset we're going to further unify the code, gradually getting rid of all the layer 3 specific assumptions. Signed-off-by: Harald Welte Signed-off-by: David S. Miller --- net/netfilter/xt_realm.c | 79 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) create mode 100644 net/netfilter/xt_realm.c (limited to 'net/netfilter/xt_realm.c') diff --git a/net/netfilter/xt_realm.c b/net/netfilter/xt_realm.c new file mode 100644 index 0000000..2b7e178 --- /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 + * + * 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 +#include +#include +#include + +#include +#include +#include + +MODULE_AUTHOR("Sampsa Ranta "); +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); -- cgit v1.1