cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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xt_iprange.c (3712B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 *	xt_iprange - Netfilter module to match IP address ranges
      4 *
      5 *	(C) 2003 Jozsef Kadlecsik <kadlec@netfilter.org>
      6 *	(C) CC Computer Consultants GmbH, 2008
      7 */
      8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
      9#include <linux/module.h>
     10#include <linux/skbuff.h>
     11#include <linux/ip.h>
     12#include <linux/ipv6.h>
     13#include <linux/netfilter/x_tables.h>
     14#include <linux/netfilter/xt_iprange.h>
     15
     16static bool
     17iprange_mt4(const struct sk_buff *skb, struct xt_action_param *par)
     18{
     19	const struct xt_iprange_mtinfo *info = par->matchinfo;
     20	const struct iphdr *iph = ip_hdr(skb);
     21	bool m;
     22
     23	if (info->flags & IPRANGE_SRC) {
     24		m  = ntohl(iph->saddr) < ntohl(info->src_min.ip);
     25		m |= ntohl(iph->saddr) > ntohl(info->src_max.ip);
     26		m ^= !!(info->flags & IPRANGE_SRC_INV);
     27		if (m) {
     28			pr_debug("src IP %pI4 NOT in range %s%pI4-%pI4\n",
     29			         &iph->saddr,
     30			         (info->flags & IPRANGE_SRC_INV) ? "(INV) " : "",
     31			         &info->src_min.ip,
     32			         &info->src_max.ip);
     33			return false;
     34		}
     35	}
     36	if (info->flags & IPRANGE_DST) {
     37		m  = ntohl(iph->daddr) < ntohl(info->dst_min.ip);
     38		m |= ntohl(iph->daddr) > ntohl(info->dst_max.ip);
     39		m ^= !!(info->flags & IPRANGE_DST_INV);
     40		if (m) {
     41			pr_debug("dst IP %pI4 NOT in range %s%pI4-%pI4\n",
     42			         &iph->daddr,
     43			         (info->flags & IPRANGE_DST_INV) ? "(INV) " : "",
     44			         &info->dst_min.ip,
     45			         &info->dst_max.ip);
     46			return false;
     47		}
     48	}
     49	return true;
     50}
     51
     52static inline int
     53iprange_ipv6_lt(const struct in6_addr *a, const struct in6_addr *b)
     54{
     55	unsigned int i;
     56
     57	for (i = 0; i < 4; ++i) {
     58		if (a->s6_addr32[i] != b->s6_addr32[i])
     59			return ntohl(a->s6_addr32[i]) < ntohl(b->s6_addr32[i]);
     60	}
     61
     62	return 0;
     63}
     64
     65static bool
     66iprange_mt6(const struct sk_buff *skb, struct xt_action_param *par)
     67{
     68	const struct xt_iprange_mtinfo *info = par->matchinfo;
     69	const struct ipv6hdr *iph = ipv6_hdr(skb);
     70	bool m;
     71
     72	if (info->flags & IPRANGE_SRC) {
     73		m  = iprange_ipv6_lt(&iph->saddr, &info->src_min.in6);
     74		m |= iprange_ipv6_lt(&info->src_max.in6, &iph->saddr);
     75		m ^= !!(info->flags & IPRANGE_SRC_INV);
     76		if (m) {
     77			pr_debug("src IP %pI6 NOT in range %s%pI6-%pI6\n",
     78				 &iph->saddr,
     79				 (info->flags & IPRANGE_SRC_INV) ? "(INV) " : "",
     80				 &info->src_min.in6,
     81				 &info->src_max.in6);
     82			return false;
     83		}
     84	}
     85	if (info->flags & IPRANGE_DST) {
     86		m  = iprange_ipv6_lt(&iph->daddr, &info->dst_min.in6);
     87		m |= iprange_ipv6_lt(&info->dst_max.in6, &iph->daddr);
     88		m ^= !!(info->flags & IPRANGE_DST_INV);
     89		if (m) {
     90			pr_debug("dst IP %pI6 NOT in range %s%pI6-%pI6\n",
     91				 &iph->daddr,
     92				 (info->flags & IPRANGE_DST_INV) ? "(INV) " : "",
     93				 &info->dst_min.in6,
     94				 &info->dst_max.in6);
     95			return false;
     96		}
     97	}
     98	return true;
     99}
    100
    101static struct xt_match iprange_mt_reg[] __read_mostly = {
    102	{
    103		.name      = "iprange",
    104		.revision  = 1,
    105		.family    = NFPROTO_IPV4,
    106		.match     = iprange_mt4,
    107		.matchsize = sizeof(struct xt_iprange_mtinfo),
    108		.me        = THIS_MODULE,
    109	},
    110	{
    111		.name      = "iprange",
    112		.revision  = 1,
    113		.family    = NFPROTO_IPV6,
    114		.match     = iprange_mt6,
    115		.matchsize = sizeof(struct xt_iprange_mtinfo),
    116		.me        = THIS_MODULE,
    117	},
    118};
    119
    120static int __init iprange_mt_init(void)
    121{
    122	return xt_register_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg));
    123}
    124
    125static void __exit iprange_mt_exit(void)
    126{
    127	xt_unregister_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg));
    128}
    129
    130module_init(iprange_mt_init);
    131module_exit(iprange_mt_exit);
    132MODULE_LICENSE("GPL");
    133MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>");
    134MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>");
    135MODULE_DESCRIPTION("Xtables: arbitrary IPv4 range matching");
    136MODULE_ALIAS("ipt_iprange");
    137MODULE_ALIAS("ip6t_iprange");