[NETFILTER]: ip6_tables: support MH match (a0ca215a) · Commits · 戴 / test

include/linux/netfilter_ipv6/ip6t_mh.h

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		#ifndef _IP6T_MH_H
		#define _IP6T_MH_H

		/* MH matching stuff */
		struct ip6t_mh
		{
		u_int8_t types[2]; /* MH type range */
		u_int8_t invflags; /* Inverse flags */
		};

		/* Values for "invflags" field in struct ip6t_mh. */
		#define IP6T_MH_INV_TYPE 0x01 /* Invert the sense of type. */
		#define IP6T_MH_INV_MASK 0x01 /* All possible flags. */

		#endif /_IP6T_MH_H/

net/ipv6/netfilter/Kconfig

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		@@ -114,6 +114,14 @@ config IP6_NF_MATCH_AH

		To compile it as a module, choose M here. If unsure, say N.

		config IP6_NF_MATCH_MH
		tristate "MH match support"
		depends on IP6_NF_IPTABLES
		help
		This module allows one to match MH packets.

		To compile it as a module, choose M here. If unsure, say N.

		config IP6_NF_MATCH_EUI64
		tristate "EUI64 address check"
		depends on IP6_NF_IPTABLES

net/ipv6/netfilter/Makefile

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		@@ -19,6 +19,7 @@ obj-$(CONFIG_IP6_NF_TARGET_LOG) += ip6t_LOG.o
		obj-$(CONFIG_IP6_NF_RAW) += ip6table_raw.o
		obj-$(CONFIG_IP6_NF_MATCH_HL) += ip6t_hl.o
		obj-$(CONFIG_IP6_NF_TARGET_REJECT) += ip6t_REJECT.o
		obj-$(CONFIG_IP6_NF_MATCH_MH) += ip6t_mh.o

		# objects for l3 independent conntrack
		nf_conntrack_ipv6-objs := nf_conntrack_l3proto_ipv6.o nf_conntrack_proto_icmpv6.o nf_conntrack_reasm.o

net/ipv6/netfilter/ip6t_mh.c

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		/*
		* Copyright (C)2006 USAGI/WIDE Project
		*
		* 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.
		*
		* Author:
		* Masahide NAKAMURA @USAGI <masahide.nakamura.cz@hitachi.com>
		*
		* Based on net/netfilter/xt_tcpudp.c
		*
		*/
		#include <linux/types.h>
		#include <linux/module.h>
		#include <net/ip.h>
		#include <linux/ipv6.h>
		#include <net/ipv6.h>
		#include <net/mip6.h>

		#include <linux/netfilter/x_tables.h>
		#include <linux/netfilter_ipv6/ip6t_mh.h>

		MODULE_DESCRIPTION("ip6t_tables match for MH");
		MODULE_LICENSE("GPL");

		#ifdef DEBUG_IP_FIREWALL_USER
		#define duprintf(format, args...) printk(format , ## args)
		#else
		#define duprintf(format, args...)
		#endif

		/* Returns 1 if the type is matched by the range, 0 otherwise */
		static inline int
		type_match(u_int8_t min, u_int8_t max, u_int8_t type, int invert)
		{
		int ret;

		ret = (type >= min && type <= max) ^ invert;
		return ret;
		}

		static int
		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,
		int *hotdrop)
		{
		struct ip6_mh _mh, *mh;
		const struct ip6t_mh *mhinfo = matchinfo;

		/* Must not be a fragment. */
		if (offset)
		return 0;

		mh = skb_header_pointer(skb, protoff, sizeof(_mh), &_mh);
		if (mh == NULL) {
		/* We've been asked to examine this packet, and we
		can't. Hence, no choice but to drop. */
		duprintf("Dropping evil MH tinygram.\n");
		*hotdrop = 1;
		return 0;
		}

		return type_match(mhinfo->types[0], mhinfo->types[1], mh->ip6mh_type,
		!!(mhinfo->invflags & IP6T_MH_INV_TYPE));
		}

		/* Called when user tries to insert an entry of this type. */
		static int
		mh_checkentry(const char *tablename,
		const void *entry,
		const struct xt_match *match,
		void *matchinfo,
		unsigned int hook_mask)
		{
		const struct ip6t_mh *mhinfo = matchinfo;

		/* Must specify no unknown invflags */
		return !(mhinfo->invflags & ~IP6T_MH_INV_MASK);
		}

		static struct xt_match mh_match = {
		.name = "mh",
		.family = AF_INET6,
		.checkentry = mh_checkentry,
		.match = match,
		.matchsize = sizeof(struct ip6t_mh),
		.proto = IPPROTO_MH,
		.me = THIS_MODULE,
		};

		static int __init ip6t_mh_init(void)
		{
		return xt_register_match(&mh_match);
		}

		static void __exit ip6t_mh_fini(void)
		{
		xt_unregister_match(&mh_match);
		}

		module_init(ip6t_mh_init);
		module_exit(ip6t_mh_fini);

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