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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ip6t_REJECT.c (3224B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * IP6 tables REJECT target module
      4 * Linux INET6 implementation
      5 *
      6 * Copyright (C)2003 USAGI/WIDE Project
      7 *
      8 * Authors:
      9 *	Yasuyuki Kozakai	<yasuyuki.kozakai@toshiba.co.jp>
     10 *
     11 * Copyright (c) 2005-2007 Patrick McHardy <kaber@trash.net>
     12 *
     13 * Based on net/ipv4/netfilter/ipt_REJECT.c
     14 */
     15#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
     16
     17#include <linux/gfp.h>
     18#include <linux/module.h>
     19#include <linux/skbuff.h>
     20#include <linux/icmpv6.h>
     21#include <linux/netdevice.h>
     22#include <net/icmp.h>
     23#include <net/flow.h>
     24#include <linux/netfilter/x_tables.h>
     25#include <linux/netfilter_ipv6/ip6_tables.h>
     26#include <linux/netfilter_ipv6/ip6t_REJECT.h>
     27
     28#include <net/netfilter/ipv6/nf_reject.h>
     29
     30MODULE_AUTHOR("Yasuyuki KOZAKAI <yasuyuki.kozakai@toshiba.co.jp>");
     31MODULE_DESCRIPTION("Xtables: packet \"rejection\" target for IPv6");
     32MODULE_LICENSE("GPL");
     33
     34static unsigned int
     35reject_tg6(struct sk_buff *skb, const struct xt_action_param *par)
     36{
     37	const struct ip6t_reject_info *reject = par->targinfo;
     38	struct net *net = xt_net(par);
     39
     40	switch (reject->with) {
     41	case IP6T_ICMP6_NO_ROUTE:
     42		nf_send_unreach6(net, skb, ICMPV6_NOROUTE, xt_hooknum(par));
     43		break;
     44	case IP6T_ICMP6_ADM_PROHIBITED:
     45		nf_send_unreach6(net, skb, ICMPV6_ADM_PROHIBITED,
     46				 xt_hooknum(par));
     47		break;
     48	case IP6T_ICMP6_NOT_NEIGHBOUR:
     49		nf_send_unreach6(net, skb, ICMPV6_NOT_NEIGHBOUR,
     50				 xt_hooknum(par));
     51		break;
     52	case IP6T_ICMP6_ADDR_UNREACH:
     53		nf_send_unreach6(net, skb, ICMPV6_ADDR_UNREACH,
     54				 xt_hooknum(par));
     55		break;
     56	case IP6T_ICMP6_PORT_UNREACH:
     57		nf_send_unreach6(net, skb, ICMPV6_PORT_UNREACH,
     58				 xt_hooknum(par));
     59		break;
     60	case IP6T_ICMP6_ECHOREPLY:
     61		/* Do nothing */
     62		break;
     63	case IP6T_TCP_RESET:
     64		nf_send_reset6(net, par->state->sk, skb, xt_hooknum(par));
     65		break;
     66	case IP6T_ICMP6_POLICY_FAIL:
     67		nf_send_unreach6(net, skb, ICMPV6_POLICY_FAIL, xt_hooknum(par));
     68		break;
     69	case IP6T_ICMP6_REJECT_ROUTE:
     70		nf_send_unreach6(net, skb, ICMPV6_REJECT_ROUTE,
     71				 xt_hooknum(par));
     72		break;
     73	}
     74
     75	return NF_DROP;
     76}
     77
     78static int reject_tg6_check(const struct xt_tgchk_param *par)
     79{
     80	const struct ip6t_reject_info *rejinfo = par->targinfo;
     81	const struct ip6t_entry *e = par->entryinfo;
     82
     83	if (rejinfo->with == IP6T_ICMP6_ECHOREPLY) {
     84		pr_info_ratelimited("ECHOREPLY is not supported\n");
     85		return -EINVAL;
     86	} else if (rejinfo->with == IP6T_TCP_RESET) {
     87		/* Must specify that it's a TCP packet */
     88		if (!(e->ipv6.flags & IP6T_F_PROTO) ||
     89		    e->ipv6.proto != IPPROTO_TCP ||
     90		    (e->ipv6.invflags & XT_INV_PROTO)) {
     91			pr_info_ratelimited("TCP_RESET illegal for non-tcp\n");
     92			return -EINVAL;
     93		}
     94	}
     95	return 0;
     96}
     97
     98static struct xt_target reject_tg6_reg __read_mostly = {
     99	.name		= "REJECT",
    100	.family		= NFPROTO_IPV6,
    101	.target		= reject_tg6,
    102	.targetsize	= sizeof(struct ip6t_reject_info),
    103	.table		= "filter",
    104	.hooks		= (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD) |
    105			  (1 << NF_INET_LOCAL_OUT),
    106	.checkentry	= reject_tg6_check,
    107	.me		= THIS_MODULE
    108};
    109
    110static int __init reject_tg6_init(void)
    111{
    112	return xt_register_target(&reject_tg6_reg);
    113}
    114
    115static void __exit reject_tg6_exit(void)
    116{
    117	xt_unregister_target(&reject_tg6_reg);
    118}
    119
    120module_init(reject_tg6_init);
    121module_exit(reject_tg6_exit);