Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 1 | /* iptables module for using new netfilter netlink queue |
| 2 | * |
| 3 | * (C) 2005 by Harald Welte <laforge@netfilter.org> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 6 | * it under the terms of the GNU General Public License version 2 as |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 7 | * published by the Free Software Foundation. |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 8 | * |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 9 | */ |
| 10 | |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/skbuff.h> |
| 13 | |
Florian Westphal | 10662aa | 2009-06-05 13:24:24 +0200 | [diff] [blame] | 14 | #include <linux/ip.h> |
| 15 | #include <linux/ipv6.h> |
| 16 | #include <linux/jhash.h> |
| 17 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 18 | #include <linux/netfilter.h> |
| 19 | #include <linux/netfilter_arp.h> |
| 20 | #include <linux/netfilter/x_tables.h> |
| 21 | #include <linux/netfilter/xt_NFQUEUE.h> |
| 22 | |
| 23 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); |
Jan Engelhardt | 2ae15b6 | 2008-01-14 23:42:28 -0800 | [diff] [blame] | 24 | MODULE_DESCRIPTION("Xtables: packet forwarding to netlink"); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 25 | MODULE_LICENSE("GPL"); |
| 26 | MODULE_ALIAS("ipt_NFQUEUE"); |
| 27 | MODULE_ALIAS("ip6t_NFQUEUE"); |
| 28 | MODULE_ALIAS("arpt_NFQUEUE"); |
| 29 | |
Florian Westphal | 10662aa | 2009-06-05 13:24:24 +0200 | [diff] [blame] | 30 | static u32 jhash_initval __read_mostly; |
| 31 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 32 | static unsigned int |
Jan Engelhardt | 7eb3558 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 33 | nfqueue_tg(struct sk_buff *skb, const struct xt_target_param *par) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 34 | { |
Jan Engelhardt | 7eb3558 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 35 | const struct xt_NFQ_info *tinfo = par->targinfo; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 36 | |
| 37 | return NF_QUEUE_NR(tinfo->queuenum); |
| 38 | } |
| 39 | |
Florian Westphal | 10662aa | 2009-06-05 13:24:24 +0200 | [diff] [blame] | 40 | static u32 hash_v4(const struct sk_buff *skb) |
| 41 | { |
| 42 | const struct iphdr *iph = ip_hdr(skb); |
Patrick McHardy | f9ffc312 | 2009-06-22 14:15:02 +0200 | [diff] [blame] | 43 | __be32 ipaddr; |
Florian Westphal | 10662aa | 2009-06-05 13:24:24 +0200 | [diff] [blame] | 44 | |
| 45 | /* packets in either direction go into same queue */ |
| 46 | ipaddr = iph->saddr ^ iph->daddr; |
| 47 | |
Patrick McHardy | f9ffc312 | 2009-06-22 14:15:02 +0200 | [diff] [blame] | 48 | return jhash_2words((__force u32)ipaddr, iph->protocol, jhash_initval); |
Florian Westphal | 10662aa | 2009-06-05 13:24:24 +0200 | [diff] [blame] | 49 | } |
| 50 | |
| 51 | static unsigned int |
| 52 | nfqueue_tg4_v1(struct sk_buff *skb, const struct xt_target_param *par) |
| 53 | { |
| 54 | const struct xt_NFQ_info_v1 *info = par->targinfo; |
| 55 | u32 queue = info->queuenum; |
| 56 | |
| 57 | if (info->queues_total > 1) |
| 58 | queue = hash_v4(skb) % info->queues_total + queue; |
| 59 | return NF_QUEUE_NR(queue); |
| 60 | } |
| 61 | |
| 62 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) |
| 63 | static u32 hash_v6(const struct sk_buff *skb) |
| 64 | { |
| 65 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
Patrick McHardy | f9ffc312 | 2009-06-22 14:15:02 +0200 | [diff] [blame] | 66 | __be32 addr[4]; |
Florian Westphal | 10662aa | 2009-06-05 13:24:24 +0200 | [diff] [blame] | 67 | |
| 68 | addr[0] = ip6h->saddr.s6_addr32[0] ^ ip6h->daddr.s6_addr32[0]; |
| 69 | addr[1] = ip6h->saddr.s6_addr32[1] ^ ip6h->daddr.s6_addr32[1]; |
| 70 | addr[2] = ip6h->saddr.s6_addr32[2] ^ ip6h->daddr.s6_addr32[2]; |
| 71 | addr[3] = ip6h->saddr.s6_addr32[3] ^ ip6h->daddr.s6_addr32[3]; |
| 72 | |
Patrick McHardy | f9ffc312 | 2009-06-22 14:15:02 +0200 | [diff] [blame] | 73 | return jhash2((__force u32 *)addr, ARRAY_SIZE(addr), jhash_initval); |
Florian Westphal | 10662aa | 2009-06-05 13:24:24 +0200 | [diff] [blame] | 74 | } |
| 75 | |
| 76 | static unsigned int |
| 77 | nfqueue_tg6_v1(struct sk_buff *skb, const struct xt_target_param *par) |
| 78 | { |
| 79 | const struct xt_NFQ_info_v1 *info = par->targinfo; |
| 80 | u32 queue = info->queuenum; |
| 81 | |
| 82 | if (info->queues_total > 1) |
| 83 | queue = hash_v6(skb) % info->queues_total + queue; |
| 84 | return NF_QUEUE_NR(queue); |
| 85 | } |
| 86 | #endif |
| 87 | |
| 88 | static bool nfqueue_tg_v1_check(const struct xt_tgchk_param *par) |
| 89 | { |
| 90 | const struct xt_NFQ_info_v1 *info = par->targinfo; |
| 91 | u32 maxid; |
| 92 | |
| 93 | if (info->queues_total == 0) { |
| 94 | pr_err("NFQUEUE: number of total queues is 0\n"); |
| 95 | return false; |
| 96 | } |
| 97 | maxid = info->queues_total - 1 + info->queuenum; |
| 98 | if (maxid > 0xffff) { |
| 99 | pr_err("NFQUEUE: number of queues (%u) out of range (got %u)\n", |
| 100 | info->queues_total, maxid); |
| 101 | return false; |
| 102 | } |
| 103 | return true; |
| 104 | } |
| 105 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 106 | static struct xt_target nfqueue_tg_reg[] __read_mostly = { |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 107 | { |
| 108 | .name = "NFQUEUE", |
Florian Westphal | 61f5abc | 2009-06-05 13:18:07 +0200 | [diff] [blame] | 109 | .family = NFPROTO_UNSPEC, |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 110 | .target = nfqueue_tg, |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 111 | .targetsize = sizeof(struct xt_NFQ_info), |
| 112 | .me = THIS_MODULE, |
| 113 | }, |
Florian Westphal | 10662aa | 2009-06-05 13:24:24 +0200 | [diff] [blame] | 114 | { |
| 115 | .name = "NFQUEUE", |
| 116 | .revision = 1, |
| 117 | .family = NFPROTO_IPV4, |
| 118 | .checkentry = nfqueue_tg_v1_check, |
| 119 | .target = nfqueue_tg4_v1, |
| 120 | .targetsize = sizeof(struct xt_NFQ_info_v1), |
| 121 | .me = THIS_MODULE, |
| 122 | }, |
| 123 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) |
| 124 | { |
| 125 | .name = "NFQUEUE", |
| 126 | .revision = 1, |
| 127 | .family = NFPROTO_IPV6, |
| 128 | .checkentry = nfqueue_tg_v1_check, |
| 129 | .target = nfqueue_tg6_v1, |
| 130 | .targetsize = sizeof(struct xt_NFQ_info_v1), |
| 131 | .me = THIS_MODULE, |
| 132 | }, |
| 133 | #endif |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 134 | }; |
| 135 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 136 | static int __init nfqueue_tg_init(void) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 137 | { |
Florian Westphal | 10662aa | 2009-06-05 13:24:24 +0200 | [diff] [blame] | 138 | get_random_bytes(&jhash_initval, sizeof(jhash_initval)); |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 139 | return xt_register_targets(nfqueue_tg_reg, ARRAY_SIZE(nfqueue_tg_reg)); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 140 | } |
| 141 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 142 | static void __exit nfqueue_tg_exit(void) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 143 | { |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 144 | xt_unregister_targets(nfqueue_tg_reg, ARRAY_SIZE(nfqueue_tg_reg)); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 145 | } |
| 146 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 147 | module_init(nfqueue_tg_init); |
| 148 | module_exit(nfqueue_tg_exit); |