| | 1 | /* |
| | 2 | * IP6 tables REJECT target module |
| | 3 | * Linux INET6 implementation |
| | 4 | * |
| | 5 | * Copyright (C)2003 USAGI/WIDE Project |
| | 6 | * |
| | 7 | * Authors: |
| | 8 | * Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp> |
| | 9 | * |
| | 10 | * Copyright (c) 2005-2007 Patrick McHardy <kaber@trash.net> |
| | 11 | * |
| | 12 | * Based on net/ipv4/netfilter/ipt_REJECT.c |
| | 13 | * |
| | 14 | * This program is free software; you can redistribute it and/or |
| | 15 | * modify it under the terms of the GNU General Public License |
| | 16 | * as published by the Free Software Foundation; either version |
| | 17 | * 2 of the License, or (at your option) any later version. |
| | 18 | */ |
| | 19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| | 20 | |
| | 21 | #include <linux/gfp.h> |
| | 22 | #include <linux/module.h> |
| | 23 | #include <linux/skbuff.h> |
| | 24 | #include <linux/icmpv6.h> |
| | 25 | #include <linux/netdevice.h> |
| | 26 | #include <net/icmp.h> |
| | 27 | #include <net/flow.h> |
| | 28 | #include <linux/netfilter/x_tables.h> |
| | 29 | #include <linux/netfilter_ipv6/ip6_tables.h> |
| | 30 | #include <linux/netfilter_ipv6/ip6t_REJECT.h> |
| | 31 | |
| | 32 | #include <net/netfilter/ipv6/nf_reject.h> |
| | 33 | |
| | 34 | MODULE_AUTHOR("Yasuyuki KOZAKAI <yasuyuki.kozakai@toshiba.co.jp>"); |
| | 35 | MODULE_DESCRIPTION("Xtables: packet \"rejection\" target for IPv6"); |
| | 36 | MODULE_LICENSE("GPL"); |
| | 37 | |
| | 38 | static unsigned int |
| | 39 | reject_tg6(struct sk_buff *skb, const struct xt_action_param *par) |
| | 40 | { |
| | 41 | const struct ip6t_reject_info *reject = par->targinfo; |
| | 42 | struct net *net = xt_net(par); |
| | 43 | |
| | 44 | switch (reject->with) { |
| | 45 | case IP6T_ICMP6_NO_ROUTE: |
| | 46 | nf_send_unreach6(net, skb, ICMPV6_NOROUTE, xt_hooknum(par)); |
| | 47 | break; |
| | 48 | case IP6T_ICMP6_ADM_PROHIBITED: |
| | 49 | nf_send_unreach6(net, skb, ICMPV6_ADM_PROHIBITED, |
| | 50 | xt_hooknum(par)); |
| | 51 | break; |
| | 52 | case IP6T_ICMP6_NOT_NEIGHBOUR: |
| | 53 | nf_send_unreach6(net, skb, ICMPV6_NOT_NEIGHBOUR, |
| | 54 | xt_hooknum(par)); |
| | 55 | break; |
| | 56 | case IP6T_ICMP6_ADDR_UNREACH: |
| | 57 | nf_send_unreach6(net, skb, ICMPV6_ADDR_UNREACH, |
| | 58 | xt_hooknum(par)); |
| | 59 | break; |
| | 60 | case IP6T_ICMP6_PORT_UNREACH: |
| | 61 | nf_send_unreach6(net, skb, ICMPV6_PORT_UNREACH, |
| | 62 | xt_hooknum(par)); |
| | 63 | break; |
| | 64 | case IP6T_ICMP6_ECHOREPLY: |
| | 65 | /* Do nothing */ |
| | 66 | break; |
| | 67 | case IP6T_TCP_RESET: |
| | 68 | nf_send_reset6(net, skb, xt_hooknum(par)); |
| | 69 | break; |
| | 70 | case IP6T_ICMP6_POLICY_FAIL: |
| | 71 | nf_send_unreach6(net, skb, ICMPV6_POLICY_FAIL, xt_hooknum(par)); |
| | 72 | break; |
| | 73 | case IP6T_ICMP6_REJECT_ROUTE: |
| | 74 | nf_send_unreach6(net, skb, ICMPV6_REJECT_ROUTE, |
| | 75 | xt_hooknum(par)); |
| | 76 | break; |
| | 77 | } |
| | 78 | |
| | 79 | return NF_DROP; |
| | 80 | } |
| | 81 | |
| | 82 | static int reject_tg6_check(const struct xt_tgchk_param *par) |
| | 83 | { |
| | 84 | const struct ip6t_reject_info *rejinfo = par->targinfo; |
| | 85 | const struct ip6t_entry *e = par->entryinfo; |
| | 86 | |
| | 87 | if (rejinfo->with == IP6T_ICMP6_ECHOREPLY) { |
| | 88 | pr_info("ECHOREPLY is not supported.\n"); |
| | 89 | return -EINVAL; |
| | 90 | } else if (rejinfo->with == IP6T_TCP_RESET) { |
| | 91 | /* Must specify that it's a TCP packet */ |
| | 92 | if (!(e->ipv6.flags & IP6T_F_PROTO) || |
| | 93 | e->ipv6.proto != IPPROTO_TCP || |
| | 94 | (e->ipv6.invflags & XT_INV_PROTO)) { |
| | 95 | pr_info("TCP_RESET illegal for non-tcp\n"); |
| | 96 | return -EINVAL; |
| | 97 | } |
| | 98 | } |
| | 99 | return 0; |
| | 100 | } |
| | 101 | |
| | 102 | static struct xt_target reject_tg6_reg __read_mostly = { |
| | 103 | .name = "REJECT", |
| | 104 | .family = NFPROTO_IPV6, |
| | 105 | .target = reject_tg6, |
| | 106 | .targetsize = sizeof(struct ip6t_reject_info), |
| | 107 | .table = "filter", |
| | 108 | .hooks = (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD) | |
| | 109 | (1 << NF_INET_LOCAL_OUT), |
| | 110 | .checkentry = reject_tg6_check, |
| | 111 | .me = THIS_MODULE |
| | 112 | }; |
| | 113 | |
| | 114 | static int __init reject_tg6_init(void) |
| | 115 | { |
| | 116 | return xt_register_target(&reject_tg6_reg); |
| | 117 | } |
| | 118 | |
| | 119 | static void __exit reject_tg6_exit(void) |
| | 120 | { |
| | 121 | xt_unregister_target(&reject_tg6_reg); |
| | 122 | } |
| | 123 | |
| | 124 | module_init(reject_tg6_init); |
| | 125 | module_exit(reject_tg6_exit); |
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