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2e4e6a17 HW |
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 | |
601e68e1 | 6 | * it under the terms of the GNU General Public License version 2 as |
2e4e6a17 | 7 | * published by the Free Software Foundation. |
601e68e1 | 8 | * |
2e4e6a17 HW |
9 | */ |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/skbuff.h> | |
13 | ||
10662aa3 FW |
14 | #include <linux/ip.h> |
15 | #include <linux/ipv6.h> | |
16 | #include <linux/jhash.h> | |
17 | ||
2e4e6a17 HW |
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>"); | |
2ae15b64 | 24 | MODULE_DESCRIPTION("Xtables: packet forwarding to netlink"); |
2e4e6a17 HW |
25 | MODULE_LICENSE("GPL"); |
26 | MODULE_ALIAS("ipt_NFQUEUE"); | |
27 | MODULE_ALIAS("ip6t_NFQUEUE"); | |
28 | MODULE_ALIAS("arpt_NFQUEUE"); | |
29 | ||
10662aa3 | 30 | static u32 jhash_initval __read_mostly; |
5191d501 | 31 | static bool rnd_inited __read_mostly; |
10662aa3 | 32 | |
2e4e6a17 | 33 | static unsigned int |
4b560b44 | 34 | nfqueue_tg(struct sk_buff *skb, const struct xt_action_param *par) |
2e4e6a17 | 35 | { |
7eb35586 | 36 | const struct xt_NFQ_info *tinfo = par->targinfo; |
2e4e6a17 HW |
37 | |
38 | return NF_QUEUE_NR(tinfo->queuenum); | |
39 | } | |
40 | ||
10662aa3 FW |
41 | static u32 hash_v4(const struct sk_buff *skb) |
42 | { | |
43 | const struct iphdr *iph = ip_hdr(skb); | |
10662aa3 FW |
44 | |
45 | /* packets in either direction go into same queue */ | |
fe31d1a8 | 46 | if ((__force u32)iph->saddr < (__force u32)iph->daddr) |
1da6dd07 FW |
47 | return jhash_3words((__force u32)iph->saddr, |
48 | (__force u32)iph->daddr, iph->protocol, jhash_initval); | |
10662aa3 | 49 | |
1da6dd07 FW |
50 | return jhash_3words((__force u32)iph->daddr, |
51 | (__force u32)iph->saddr, iph->protocol, jhash_initval); | |
10662aa3 FW |
52 | } |
53 | ||
c0cd1156 | 54 | #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES) |
10662aa3 FW |
55 | static u32 hash_v6(const struct sk_buff *skb) |
56 | { | |
57 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); | |
1da6dd07 | 58 | u32 a, b, c; |
10662aa3 | 59 | |
fe31d1a8 PM |
60 | if ((__force u32)ip6h->saddr.s6_addr32[3] < |
61 | (__force u32)ip6h->daddr.s6_addr32[3]) { | |
1da6dd07 FW |
62 | a = (__force u32) ip6h->saddr.s6_addr32[3]; |
63 | b = (__force u32) ip6h->daddr.s6_addr32[3]; | |
64 | } else { | |
65 | b = (__force u32) ip6h->saddr.s6_addr32[3]; | |
66 | a = (__force u32) ip6h->daddr.s6_addr32[3]; | |
67 | } | |
10662aa3 | 68 | |
fe31d1a8 PM |
69 | if ((__force u32)ip6h->saddr.s6_addr32[1] < |
70 | (__force u32)ip6h->daddr.s6_addr32[1]) | |
1da6dd07 FW |
71 | c = (__force u32) ip6h->saddr.s6_addr32[1]; |
72 | else | |
73 | c = (__force u32) ip6h->daddr.s6_addr32[1]; | |
74 | ||
75 | return jhash_3words(a, b, c, jhash_initval); | |
10662aa3 | 76 | } |
f76a47c8 | 77 | #endif |
10662aa3 FW |
78 | |
79 | static unsigned int | |
4b560b44 | 80 | nfqueue_tg_v1(struct sk_buff *skb, const struct xt_action_param *par) |
10662aa3 FW |
81 | { |
82 | const struct xt_NFQ_info_v1 *info = par->targinfo; | |
83 | u32 queue = info->queuenum; | |
84 | ||
f76a47c8 | 85 | if (info->queues_total > 1) { |
0d345455 | 86 | if (par->family == NFPROTO_IPV4) |
ca361810 CG |
87 | queue = (((u64) hash_v4(skb) * info->queues_total) >> |
88 | 32) + queue; | |
c0cd1156 | 89 | #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES) |
0d345455 | 90 | else if (par->family == NFPROTO_IPV6) |
ca361810 CG |
91 | queue = (((u64) hash_v6(skb) * info->queues_total) >> |
92 | 32) + queue; | |
f76a47c8 JE |
93 | #endif |
94 | } | |
10662aa3 FW |
95 | return NF_QUEUE_NR(queue); |
96 | } | |
10662aa3 | 97 | |
94b27cc3 FW |
98 | static unsigned int |
99 | nfqueue_tg_v2(struct sk_buff *skb, const struct xt_action_param *par) | |
10662aa3 | 100 | { |
94b27cc3 FW |
101 | const struct xt_NFQ_info_v2 *info = par->targinfo; |
102 | unsigned int ret = nfqueue_tg_v1(skb, par); | |
103 | ||
104 | if (info->bypass) | |
105 | ret |= NF_VERDICT_FLAG_QUEUE_BYPASS; | |
106 | return ret; | |
107 | } | |
108 | ||
109 | static int nfqueue_tg_check(const struct xt_tgchk_param *par) | |
110 | { | |
111 | const struct xt_NFQ_info_v2 *info = par->targinfo; | |
10662aa3 FW |
112 | u32 maxid; |
113 | ||
5191d501 JE |
114 | if (unlikely(!rnd_inited)) { |
115 | get_random_bytes(&jhash_initval, sizeof(jhash_initval)); | |
116 | rnd_inited = true; | |
117 | } | |
10662aa3 FW |
118 | if (info->queues_total == 0) { |
119 | pr_err("NFQUEUE: number of total queues is 0\n"); | |
d6b00a53 | 120 | return -EINVAL; |
10662aa3 FW |
121 | } |
122 | maxid = info->queues_total - 1 + info->queuenum; | |
123 | if (maxid > 0xffff) { | |
124 | pr_err("NFQUEUE: number of queues (%u) out of range (got %u)\n", | |
125 | info->queues_total, maxid); | |
4a5a5c73 | 126 | return -ERANGE; |
10662aa3 | 127 | } |
94b27cc3 FW |
128 | if (par->target->revision == 2 && info->bypass > 1) |
129 | return -EINVAL; | |
d6b00a53 | 130 | return 0; |
10662aa3 FW |
131 | } |
132 | ||
d3c5ee6d | 133 | static struct xt_target nfqueue_tg_reg[] __read_mostly = { |
4470bbc7 PM |
134 | { |
135 | .name = "NFQUEUE", | |
61f5abca | 136 | .family = NFPROTO_UNSPEC, |
d3c5ee6d | 137 | .target = nfqueue_tg, |
4470bbc7 PM |
138 | .targetsize = sizeof(struct xt_NFQ_info), |
139 | .me = THIS_MODULE, | |
140 | }, | |
10662aa3 FW |
141 | { |
142 | .name = "NFQUEUE", | |
143 | .revision = 1, | |
f76a47c8 | 144 | .family = NFPROTO_UNSPEC, |
94b27cc3 | 145 | .checkentry = nfqueue_tg_check, |
f76a47c8 | 146 | .target = nfqueue_tg_v1, |
10662aa3 FW |
147 | .targetsize = sizeof(struct xt_NFQ_info_v1), |
148 | .me = THIS_MODULE, | |
149 | }, | |
94b27cc3 FW |
150 | { |
151 | .name = "NFQUEUE", | |
152 | .revision = 2, | |
153 | .family = NFPROTO_UNSPEC, | |
154 | .checkentry = nfqueue_tg_check, | |
155 | .target = nfqueue_tg_v2, | |
156 | .targetsize = sizeof(struct xt_NFQ_info_v2), | |
157 | .me = THIS_MODULE, | |
158 | }, | |
2e4e6a17 HW |
159 | }; |
160 | ||
d3c5ee6d | 161 | static int __init nfqueue_tg_init(void) |
2e4e6a17 | 162 | { |
d3c5ee6d | 163 | return xt_register_targets(nfqueue_tg_reg, ARRAY_SIZE(nfqueue_tg_reg)); |
2e4e6a17 HW |
164 | } |
165 | ||
d3c5ee6d | 166 | static void __exit nfqueue_tg_exit(void) |
2e4e6a17 | 167 | { |
d3c5ee6d | 168 | xt_unregister_targets(nfqueue_tg_reg, ARRAY_SIZE(nfqueue_tg_reg)); |
2e4e6a17 HW |
169 | } |
170 | ||
d3c5ee6d JE |
171 | module_init(nfqueue_tg_init); |
172 | module_exit(nfqueue_tg_exit); |