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![Andreas Herz](/assets/img/avatar_default.png)
RFC 4443 added two new codes values for ICMPv6 type 1: 5 - Source address failed ingress/egress policy 6 - Reject route to destination And RFC 7084 states in L-14 that IPv6 Router MUST send ICMPv6 Destination Unreachable with code 5 for packets forwarded to it that use an address from a prefix that has been invalidated. Codes 5 and 6 are more informative subsets of code 1. Signed-off-by: Andreas Herz <andi@geekosphere.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
120 lines
3.3 KiB
C
120 lines
3.3 KiB
C
/*
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* IP6 tables REJECT target module
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* Linux INET6 implementation
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*
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* Copyright (C)2003 USAGI/WIDE Project
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*
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* Authors:
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* Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>
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*
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* Copyright (c) 2005-2007 Patrick McHardy <kaber@trash.net>
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*
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* Based on net/ipv4/netfilter/ipt_REJECT.c
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/gfp.h>
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/icmpv6.h>
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#include <linux/netdevice.h>
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#include <net/icmp.h>
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#include <net/flow.h>
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#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter_ipv6/ip6_tables.h>
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#include <linux/netfilter_ipv6/ip6t_REJECT.h>
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#include <net/netfilter/ipv6/nf_reject.h>
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MODULE_AUTHOR("Yasuyuki KOZAKAI <yasuyuki.kozakai@toshiba.co.jp>");
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MODULE_DESCRIPTION("Xtables: packet \"rejection\" target for IPv6");
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MODULE_LICENSE("GPL");
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static unsigned int
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reject_tg6(struct sk_buff *skb, const struct xt_action_param *par)
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{
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const struct ip6t_reject_info *reject = par->targinfo;
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struct net *net = dev_net((par->in != NULL) ? par->in : par->out);
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switch (reject->with) {
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case IP6T_ICMP6_NO_ROUTE:
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nf_send_unreach6(net, skb, ICMPV6_NOROUTE, par->hooknum);
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break;
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case IP6T_ICMP6_ADM_PROHIBITED:
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nf_send_unreach6(net, skb, ICMPV6_ADM_PROHIBITED, par->hooknum);
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break;
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case IP6T_ICMP6_NOT_NEIGHBOUR:
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nf_send_unreach6(net, skb, ICMPV6_NOT_NEIGHBOUR, par->hooknum);
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break;
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case IP6T_ICMP6_ADDR_UNREACH:
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nf_send_unreach6(net, skb, ICMPV6_ADDR_UNREACH, par->hooknum);
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break;
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case IP6T_ICMP6_PORT_UNREACH:
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nf_send_unreach6(net, skb, ICMPV6_PORT_UNREACH, par->hooknum);
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break;
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case IP6T_ICMP6_ECHOREPLY:
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/* Do nothing */
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break;
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case IP6T_TCP_RESET:
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nf_send_reset6(net, skb, par->hooknum);
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break;
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case IP6T_ICMP6_POLICY_FAIL:
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nf_send_unreach6(net, skb, ICMPV6_POLICY_FAIL, par->hooknum);
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break;
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case IP6T_ICMP6_REJECT_ROUTE:
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nf_send_unreach6(net, skb, ICMPV6_REJECT_ROUTE, par->hooknum);
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break;
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}
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return NF_DROP;
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}
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static int reject_tg6_check(const struct xt_tgchk_param *par)
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{
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const struct ip6t_reject_info *rejinfo = par->targinfo;
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const struct ip6t_entry *e = par->entryinfo;
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if (rejinfo->with == IP6T_ICMP6_ECHOREPLY) {
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pr_info("ECHOREPLY is not supported.\n");
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return -EINVAL;
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} else if (rejinfo->with == IP6T_TCP_RESET) {
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/* Must specify that it's a TCP packet */
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if (!(e->ipv6.flags & IP6T_F_PROTO) ||
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e->ipv6.proto != IPPROTO_TCP ||
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(e->ipv6.invflags & XT_INV_PROTO)) {
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pr_info("TCP_RESET illegal for non-tcp\n");
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return -EINVAL;
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}
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}
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return 0;
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}
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static struct xt_target reject_tg6_reg __read_mostly = {
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.name = "REJECT",
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.family = NFPROTO_IPV6,
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.target = reject_tg6,
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.targetsize = sizeof(struct ip6t_reject_info),
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.table = "filter",
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.hooks = (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD) |
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(1 << NF_INET_LOCAL_OUT),
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.checkentry = reject_tg6_check,
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.me = THIS_MODULE
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};
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static int __init reject_tg6_init(void)
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{
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return xt_register_target(&reject_tg6_reg);
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}
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static void __exit reject_tg6_exit(void)
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{
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xt_unregister_target(&reject_tg6_reg);
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}
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module_init(reject_tg6_init);
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module_exit(reject_tg6_exit);
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