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- /*
- * 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 = par->net;
- switch (reject->with) {
- case IP6T_ICMP6_NO_ROUTE:
- nf_send_unreach6(net, skb, ICMPV6_NOROUTE, par->hooknum);
- break;
- case IP6T_ICMP6_ADM_PROHIBITED:
- nf_send_unreach6(net, skb, ICMPV6_ADM_PROHIBITED, par->hooknum);
- break;
- case IP6T_ICMP6_NOT_NEIGHBOUR:
- nf_send_unreach6(net, skb, ICMPV6_NOT_NEIGHBOUR, par->hooknum);
- break;
- case IP6T_ICMP6_ADDR_UNREACH:
- nf_send_unreach6(net, skb, ICMPV6_ADDR_UNREACH, par->hooknum);
- break;
- case IP6T_ICMP6_PORT_UNREACH:
- nf_send_unreach6(net, skb, ICMPV6_PORT_UNREACH, par->hooknum);
- break;
- case IP6T_ICMP6_ECHOREPLY:
- /* Do nothing */
- break;
- case IP6T_TCP_RESET:
- nf_send_reset6(net, skb, par->hooknum);
- break;
- case IP6T_ICMP6_POLICY_FAIL:
- nf_send_unreach6(net, skb, ICMPV6_POLICY_FAIL, par->hooknum);
- break;
- case IP6T_ICMP6_REJECT_ROUTE:
- nf_send_unreach6(net, skb, ICMPV6_REJECT_ROUTE, par->hooknum);
- 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("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("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);
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