d2912cb15b
Based on 2 normalized pattern(s): 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 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 # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
91 lines
2.1 KiB
C
91 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (C)2006 USAGI/WIDE Project
|
|
*
|
|
* Author:
|
|
* Masahide NAKAMURA @USAGI <masahide.nakamura.cz@hitachi.com>
|
|
*
|
|
* Based on net/netfilter/xt_tcpudp.c
|
|
*/
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
#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("Xtables: IPv6 Mobility Header match");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
/* Returns 1 if the type is matched by the range, 0 otherwise */
|
|
static inline bool
|
|
type_match(u_int8_t min, u_int8_t max, u_int8_t type, bool invert)
|
|
{
|
|
return (type >= min && type <= max) ^ invert;
|
|
}
|
|
|
|
static bool mh_mt6(const struct sk_buff *skb, struct xt_action_param *par)
|
|
{
|
|
struct ip6_mh _mh;
|
|
const struct ip6_mh *mh;
|
|
const struct ip6t_mh *mhinfo = par->matchinfo;
|
|
|
|
/* Must not be a fragment. */
|
|
if (par->fragoff != 0)
|
|
return false;
|
|
|
|
mh = skb_header_pointer(skb, par->thoff, sizeof(_mh), &_mh);
|
|
if (mh == NULL) {
|
|
/* We've been asked to examine this packet, and we
|
|
can't. Hence, no choice but to drop. */
|
|
pr_debug("Dropping evil MH tinygram.\n");
|
|
par->hotdrop = true;
|
|
return false;
|
|
}
|
|
|
|
if (mh->ip6mh_proto != IPPROTO_NONE) {
|
|
pr_debug("Dropping invalid MH Payload Proto: %u\n",
|
|
mh->ip6mh_proto);
|
|
par->hotdrop = true;
|
|
return false;
|
|
}
|
|
|
|
return type_match(mhinfo->types[0], mhinfo->types[1], mh->ip6mh_type,
|
|
!!(mhinfo->invflags & IP6T_MH_INV_TYPE));
|
|
}
|
|
|
|
static int mh_mt6_check(const struct xt_mtchk_param *par)
|
|
{
|
|
const struct ip6t_mh *mhinfo = par->matchinfo;
|
|
|
|
/* Must specify no unknown invflags */
|
|
return (mhinfo->invflags & ~IP6T_MH_INV_MASK) ? -EINVAL : 0;
|
|
}
|
|
|
|
static struct xt_match mh_mt6_reg __read_mostly = {
|
|
.name = "mh",
|
|
.family = NFPROTO_IPV6,
|
|
.checkentry = mh_mt6_check,
|
|
.match = mh_mt6,
|
|
.matchsize = sizeof(struct ip6t_mh),
|
|
.proto = IPPROTO_MH,
|
|
.me = THIS_MODULE,
|
|
};
|
|
|
|
static int __init mh_mt6_init(void)
|
|
{
|
|
return xt_register_match(&mh_mt6_reg);
|
|
}
|
|
|
|
static void __exit mh_mt6_exit(void)
|
|
{
|
|
xt_unregister_match(&mh_mt6_reg);
|
|
}
|
|
|
|
module_init(mh_mt6_init);
|
|
module_exit(mh_mt6_exit);
|