| /* |
| * IP6 tables REJECT target module |
| * Linux INET6 implementation |
| * |
| * Copyright (C)2003 USAGI/WIDE Project |
| * |
| * Authors: |
| * Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp> |
| * |
| * Copyright (c) 2005-2007 Patrick McHardy <kaber@trash.net> |
| * |
| * Based on net/ipv4/netfilter/ipt_REJECT.c |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/gfp.h> |
| #include <linux/module.h> |
| #include <linux/skbuff.h> |
| #include <linux/icmpv6.h> |
| #include <linux/netdevice.h> |
| #include <net/icmp.h> |
| #include <net/flow.h> |
| #include <linux/netfilter/x_tables.h> |
| #include <linux/netfilter_ipv6/ip6_tables.h> |
| #include <linux/netfilter_ipv6/ip6t_REJECT.h> |
| |
| #include <net/netfilter/ipv6/nf_reject.h> |
| |
| MODULE_AUTHOR("Yasuyuki KOZAKAI <yasuyuki.kozakai@toshiba.co.jp>"); |
| MODULE_DESCRIPTION("Xtables: packet \"rejection\" target for IPv6"); |
| MODULE_LICENSE("GPL"); |
| |
| static unsigned int |
| reject_tg6(struct sk_buff *skb, const struct xt_action_param *par) |
| { |
| const struct ip6t_reject_info *reject = par->targinfo; |
| struct net *net = xt_net(par); |
| |
| switch (reject->with) { |
| case IP6T_ICMP6_NO_ROUTE: |
| nf_send_unreach6(net, skb, ICMPV6_NOROUTE, xt_hooknum(par)); |
| break; |
| case IP6T_ICMP6_ADM_PROHIBITED: |
| nf_send_unreach6(net, skb, ICMPV6_ADM_PROHIBITED, |
| xt_hooknum(par)); |
| break; |
| case IP6T_ICMP6_NOT_NEIGHBOUR: |
| nf_send_unreach6(net, skb, ICMPV6_NOT_NEIGHBOUR, |
| xt_hooknum(par)); |
| break; |
| case IP6T_ICMP6_ADDR_UNREACH: |
| nf_send_unreach6(net, skb, ICMPV6_ADDR_UNREACH, |
| xt_hooknum(par)); |
| break; |
| case IP6T_ICMP6_PORT_UNREACH: |
| nf_send_unreach6(net, skb, ICMPV6_PORT_UNREACH, |
| xt_hooknum(par)); |
| break; |
| case IP6T_ICMP6_ECHOREPLY: |
| /* Do nothing */ |
| break; |
| case IP6T_TCP_RESET: |
| nf_send_reset6(net, skb, xt_hooknum(par)); |
| break; |
| case IP6T_ICMP6_POLICY_FAIL: |
| nf_send_unreach6(net, skb, ICMPV6_POLICY_FAIL, xt_hooknum(par)); |
| break; |
| case IP6T_ICMP6_REJECT_ROUTE: |
| nf_send_unreach6(net, skb, ICMPV6_REJECT_ROUTE, |
| xt_hooknum(par)); |
| break; |
| } |
| |
| return NF_DROP; |
| } |
| |
| static int reject_tg6_check(const struct xt_tgchk_param *par) |
| { |
| const struct ip6t_reject_info *rejinfo = par->targinfo; |
| const struct ip6t_entry *e = par->entryinfo; |
| |
| if (rejinfo->with == IP6T_ICMP6_ECHOREPLY) { |
| pr_info_ratelimited("ECHOREPLY is not supported\n"); |
| return -EINVAL; |
| } else if (rejinfo->with == IP6T_TCP_RESET) { |
| /* Must specify that it's a TCP packet */ |
| if (!(e->ipv6.flags & IP6T_F_PROTO) || |
| e->ipv6.proto != IPPROTO_TCP || |
| (e->ipv6.invflags & XT_INV_PROTO)) { |
| pr_info_ratelimited("TCP_RESET illegal for non-tcp\n"); |
| return -EINVAL; |
| } |
| } |
| return 0; |
| } |
| |
| static struct xt_target reject_tg6_reg __read_mostly = { |
| .name = "REJECT", |
| .family = NFPROTO_IPV6, |
| .target = reject_tg6, |
| .targetsize = sizeof(struct ip6t_reject_info), |
| .table = "filter", |
| .hooks = (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD) | |
| (1 << NF_INET_LOCAL_OUT), |
| .checkentry = reject_tg6_check, |
| .me = THIS_MODULE |
| }; |
| |
| static int __init reject_tg6_init(void) |
| { |
| return xt_register_target(&reject_tg6_reg); |
| } |
| |
| static void __exit reject_tg6_exit(void) |
| { |
| xt_unregister_target(&reject_tg6_reg); |
| } |
| |
| module_init(reject_tg6_init); |
| module_exit(reject_tg6_exit); |