Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
764d8a9f PM |
2 | /* |
3 | * IP6 tables REJECT target module | |
4 | * Linux INET6 implementation | |
5 | * | |
6 | * Copyright (C)2003 USAGI/WIDE Project | |
7 | * | |
8 | * Authors: | |
9 | * Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp> | |
10 | * | |
f229f6ce PM |
11 | * Copyright (c) 2005-2007 Patrick McHardy <kaber@trash.net> |
12 | * | |
764d8a9f | 13 | * Based on net/ipv4/netfilter/ipt_REJECT.c |
764d8a9f | 14 | */ |
ff67e4e4 | 15 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
764d8a9f | 16 | |
5a0e3ad6 | 17 | #include <linux/gfp.h> |
764d8a9f PM |
18 | #include <linux/module.h> |
19 | #include <linux/skbuff.h> | |
20 | #include <linux/icmpv6.h> | |
21 | #include <linux/netdevice.h> | |
764d8a9f | 22 | #include <net/icmp.h> |
764d8a9f | 23 | #include <net/flow.h> |
6709dbbb | 24 | #include <linux/netfilter/x_tables.h> |
764d8a9f PM |
25 | #include <linux/netfilter_ipv6/ip6_tables.h> |
26 | #include <linux/netfilter_ipv6/ip6t_REJECT.h> | |
27 | ||
cc70d069 EL |
28 | #include <net/netfilter/ipv6/nf_reject.h> |
29 | ||
764d8a9f | 30 | MODULE_AUTHOR("Yasuyuki KOZAKAI <yasuyuki.kozakai@toshiba.co.jp>"); |
2ae15b64 | 31 | MODULE_DESCRIPTION("Xtables: packet \"rejection\" target for IPv6"); |
764d8a9f PM |
32 | MODULE_LICENSE("GPL"); |
33 | ||
d3c5ee6d | 34 | static unsigned int |
4b560b44 | 35 | reject_tg6(struct sk_buff *skb, const struct xt_action_param *par) |
764d8a9f | 36 | { |
7eb35586 | 37 | const struct ip6t_reject_info *reject = par->targinfo; |
613dbd95 | 38 | struct net *net = xt_net(par); |
764d8a9f | 39 | |
1ab1457c YH |
40 | switch (reject->with) { |
41 | case IP6T_ICMP6_NO_ROUTE: | |
613dbd95 | 42 | nf_send_unreach6(net, skb, ICMPV6_NOROUTE, xt_hooknum(par)); |
1ab1457c YH |
43 | break; |
44 | case IP6T_ICMP6_ADM_PROHIBITED: | |
613dbd95 PNA |
45 | nf_send_unreach6(net, skb, ICMPV6_ADM_PROHIBITED, |
46 | xt_hooknum(par)); | |
1ab1457c YH |
47 | break; |
48 | case IP6T_ICMP6_NOT_NEIGHBOUR: | |
613dbd95 PNA |
49 | nf_send_unreach6(net, skb, ICMPV6_NOT_NEIGHBOUR, |
50 | xt_hooknum(par)); | |
1ab1457c YH |
51 | break; |
52 | case IP6T_ICMP6_ADDR_UNREACH: | |
613dbd95 PNA |
53 | nf_send_unreach6(net, skb, ICMPV6_ADDR_UNREACH, |
54 | xt_hooknum(par)); | |
1ab1457c YH |
55 | break; |
56 | case IP6T_ICMP6_PORT_UNREACH: | |
613dbd95 PNA |
57 | nf_send_unreach6(net, skb, ICMPV6_PORT_UNREACH, |
58 | xt_hooknum(par)); | |
1ab1457c YH |
59 | break; |
60 | case IP6T_ICMP6_ECHOREPLY: | |
764d8a9f PM |
61 | /* Do nothing */ |
62 | break; | |
63 | case IP6T_TCP_RESET: | |
613dbd95 | 64 | nf_send_reset6(net, skb, xt_hooknum(par)); |
764d8a9f | 65 | break; |
1afe839e | 66 | case IP6T_ICMP6_POLICY_FAIL: |
613dbd95 | 67 | nf_send_unreach6(net, skb, ICMPV6_POLICY_FAIL, xt_hooknum(par)); |
1afe839e AH |
68 | break; |
69 | case IP6T_ICMP6_REJECT_ROUTE: | |
613dbd95 PNA |
70 | nf_send_unreach6(net, skb, ICMPV6_REJECT_ROUTE, |
71 | xt_hooknum(par)); | |
1afe839e | 72 | break; |
764d8a9f PM |
73 | } |
74 | ||
75 | return NF_DROP; | |
76 | } | |
77 | ||
135367b8 | 78 | static int reject_tg6_check(const struct xt_tgchk_param *par) |
764d8a9f | 79 | { |
af5d6dc2 JE |
80 | const struct ip6t_reject_info *rejinfo = par->targinfo; |
81 | const struct ip6t_entry *e = par->entryinfo; | |
764d8a9f | 82 | |
764d8a9f | 83 | if (rejinfo->with == IP6T_ICMP6_ECHOREPLY) { |
b2606644 | 84 | pr_info_ratelimited("ECHOREPLY is not supported\n"); |
d6b00a53 | 85 | return -EINVAL; |
764d8a9f PM |
86 | } else if (rejinfo->with == IP6T_TCP_RESET) { |
87 | /* Must specify that it's a TCP packet */ | |
e35158e4 PNA |
88 | if (!(e->ipv6.flags & IP6T_F_PROTO) || |
89 | e->ipv6.proto != IPPROTO_TCP || | |
3666ed1c | 90 | (e->ipv6.invflags & XT_INV_PROTO)) { |
b2606644 | 91 | pr_info_ratelimited("TCP_RESET illegal for non-tcp\n"); |
d6b00a53 | 92 | return -EINVAL; |
764d8a9f PM |
93 | } |
94 | } | |
d6b00a53 | 95 | return 0; |
764d8a9f PM |
96 | } |
97 | ||
d3c5ee6d | 98 | static struct xt_target reject_tg6_reg __read_mostly = { |
764d8a9f | 99 | .name = "REJECT", |
ee999d8b | 100 | .family = NFPROTO_IPV6, |
d3c5ee6d | 101 | .target = reject_tg6, |
7f939713 PM |
102 | .targetsize = sizeof(struct ip6t_reject_info), |
103 | .table = "filter", | |
6e23ae2a PM |
104 | .hooks = (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD) | |
105 | (1 << NF_INET_LOCAL_OUT), | |
d3c5ee6d | 106 | .checkentry = reject_tg6_check, |
764d8a9f PM |
107 | .me = THIS_MODULE |
108 | }; | |
109 | ||
d3c5ee6d | 110 | static int __init reject_tg6_init(void) |
764d8a9f | 111 | { |
d3c5ee6d | 112 | return xt_register_target(&reject_tg6_reg); |
764d8a9f PM |
113 | } |
114 | ||
d3c5ee6d | 115 | static void __exit reject_tg6_exit(void) |
764d8a9f | 116 | { |
d3c5ee6d | 117 | xt_unregister_target(&reject_tg6_reg); |
764d8a9f PM |
118 | } |
119 | ||
d3c5ee6d JE |
120 | module_init(reject_tg6_init); |
121 | module_exit(reject_tg6_exit); |