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764d8a9f PM |
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 | * | |
f229f6ce PM |
10 | * Copyright (c) 2005-2007 Patrick McHardy <kaber@trash.net> |
11 | * | |
764d8a9f PM |
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 | */ | |
ff67e4e4 | 19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
764d8a9f | 20 | |
5a0e3ad6 | 21 | #include <linux/gfp.h> |
764d8a9f PM |
22 | #include <linux/module.h> |
23 | #include <linux/skbuff.h> | |
24 | #include <linux/icmpv6.h> | |
25 | #include <linux/netdevice.h> | |
764d8a9f | 26 | #include <net/icmp.h> |
764d8a9f | 27 | #include <net/flow.h> |
6709dbbb | 28 | #include <linux/netfilter/x_tables.h> |
764d8a9f PM |
29 | #include <linux/netfilter_ipv6/ip6_tables.h> |
30 | #include <linux/netfilter_ipv6/ip6t_REJECT.h> | |
31 | ||
cc70d069 EL |
32 | #include <net/netfilter/ipv6/nf_reject.h> |
33 | ||
764d8a9f | 34 | MODULE_AUTHOR("Yasuyuki KOZAKAI <yasuyuki.kozakai@toshiba.co.jp>"); |
2ae15b64 | 35 | MODULE_DESCRIPTION("Xtables: packet \"rejection\" target for IPv6"); |
764d8a9f PM |
36 | MODULE_LICENSE("GPL"); |
37 | ||
d3c5ee6d | 38 | static unsigned int |
4b560b44 | 39 | reject_tg6(struct sk_buff *skb, const struct xt_action_param *par) |
764d8a9f | 40 | { |
7eb35586 | 41 | const struct ip6t_reject_info *reject = par->targinfo; |
613dbd95 | 42 | struct net *net = xt_net(par); |
764d8a9f | 43 | |
1ab1457c YH |
44 | switch (reject->with) { |
45 | case IP6T_ICMP6_NO_ROUTE: | |
613dbd95 | 46 | nf_send_unreach6(net, skb, ICMPV6_NOROUTE, xt_hooknum(par)); |
1ab1457c YH |
47 | break; |
48 | case IP6T_ICMP6_ADM_PROHIBITED: | |
613dbd95 PNA |
49 | nf_send_unreach6(net, skb, ICMPV6_ADM_PROHIBITED, |
50 | xt_hooknum(par)); | |
1ab1457c YH |
51 | break; |
52 | case IP6T_ICMP6_NOT_NEIGHBOUR: | |
613dbd95 PNA |
53 | nf_send_unreach6(net, skb, ICMPV6_NOT_NEIGHBOUR, |
54 | xt_hooknum(par)); | |
1ab1457c YH |
55 | break; |
56 | case IP6T_ICMP6_ADDR_UNREACH: | |
613dbd95 PNA |
57 | nf_send_unreach6(net, skb, ICMPV6_ADDR_UNREACH, |
58 | xt_hooknum(par)); | |
1ab1457c YH |
59 | break; |
60 | case IP6T_ICMP6_PORT_UNREACH: | |
613dbd95 PNA |
61 | nf_send_unreach6(net, skb, ICMPV6_PORT_UNREACH, |
62 | xt_hooknum(par)); | |
1ab1457c YH |
63 | break; |
64 | case IP6T_ICMP6_ECHOREPLY: | |
764d8a9f PM |
65 | /* Do nothing */ |
66 | break; | |
67 | case IP6T_TCP_RESET: | |
613dbd95 | 68 | nf_send_reset6(net, skb, xt_hooknum(par)); |
764d8a9f | 69 | break; |
1afe839e | 70 | case IP6T_ICMP6_POLICY_FAIL: |
613dbd95 | 71 | nf_send_unreach6(net, skb, ICMPV6_POLICY_FAIL, xt_hooknum(par)); |
1afe839e AH |
72 | break; |
73 | case IP6T_ICMP6_REJECT_ROUTE: | |
613dbd95 PNA |
74 | nf_send_unreach6(net, skb, ICMPV6_REJECT_ROUTE, |
75 | xt_hooknum(par)); | |
1afe839e | 76 | break; |
764d8a9f PM |
77 | } |
78 | ||
79 | return NF_DROP; | |
80 | } | |
81 | ||
135367b8 | 82 | static int reject_tg6_check(const struct xt_tgchk_param *par) |
764d8a9f | 83 | { |
af5d6dc2 JE |
84 | const struct ip6t_reject_info *rejinfo = par->targinfo; |
85 | const struct ip6t_entry *e = par->entryinfo; | |
764d8a9f | 86 | |
764d8a9f | 87 | if (rejinfo->with == IP6T_ICMP6_ECHOREPLY) { |
ff67e4e4 | 88 | pr_info("ECHOREPLY is not supported.\n"); |
d6b00a53 | 89 | return -EINVAL; |
764d8a9f PM |
90 | } else if (rejinfo->with == IP6T_TCP_RESET) { |
91 | /* Must specify that it's a TCP packet */ | |
e35158e4 PNA |
92 | if (!(e->ipv6.flags & IP6T_F_PROTO) || |
93 | e->ipv6.proto != IPPROTO_TCP || | |
3666ed1c | 94 | (e->ipv6.invflags & XT_INV_PROTO)) { |
ff67e4e4 | 95 | pr_info("TCP_RESET illegal for non-tcp\n"); |
d6b00a53 | 96 | return -EINVAL; |
764d8a9f PM |
97 | } |
98 | } | |
d6b00a53 | 99 | return 0; |
764d8a9f PM |
100 | } |
101 | ||
d3c5ee6d | 102 | static struct xt_target reject_tg6_reg __read_mostly = { |
764d8a9f | 103 | .name = "REJECT", |
ee999d8b | 104 | .family = NFPROTO_IPV6, |
d3c5ee6d | 105 | .target = reject_tg6, |
7f939713 PM |
106 | .targetsize = sizeof(struct ip6t_reject_info), |
107 | .table = "filter", | |
6e23ae2a PM |
108 | .hooks = (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD) | |
109 | (1 << NF_INET_LOCAL_OUT), | |
d3c5ee6d | 110 | .checkentry = reject_tg6_check, |
764d8a9f PM |
111 | .me = THIS_MODULE |
112 | }; | |
113 | ||
d3c5ee6d | 114 | static int __init reject_tg6_init(void) |
764d8a9f | 115 | { |
d3c5ee6d | 116 | return xt_register_target(&reject_tg6_reg); |
764d8a9f PM |
117 | } |
118 | ||
d3c5ee6d | 119 | static void __exit reject_tg6_exit(void) |
764d8a9f | 120 | { |
d3c5ee6d | 121 | xt_unregister_target(&reject_tg6_reg); |
764d8a9f PM |
122 | } |
123 | ||
d3c5ee6d JE |
124 | module_init(reject_tg6_init); |
125 | module_exit(reject_tg6_exit); |