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Linux/net/netfilter/xt_NFQUEUE.c

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  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
  6  * it under the terms of the GNU General Public License version 2 as
  7  * published by the Free Software Foundation.
  8  *
  9  */
 10 
 11 #include <linux/module.h>
 12 #include <linux/skbuff.h>
 13 
 14 #include <linux/netfilter.h>
 15 #include <linux/netfilter_arp.h>
 16 #include <linux/netfilter/x_tables.h>
 17 #include <linux/netfilter/xt_NFQUEUE.h>
 18 
 19 #include <net/netfilter/nf_queue.h>
 20 
 21 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
 22 MODULE_DESCRIPTION("Xtables: packet forwarding to netlink");
 23 MODULE_LICENSE("GPL");
 24 MODULE_ALIAS("ipt_NFQUEUE");
 25 MODULE_ALIAS("ip6t_NFQUEUE");
 26 MODULE_ALIAS("arpt_NFQUEUE");
 27 
 28 static u32 jhash_initval __read_mostly;
 29 
 30 static unsigned int
 31 nfqueue_tg(struct sk_buff *skb, const struct xt_action_param *par)
 32 {
 33         const struct xt_NFQ_info *tinfo = par->targinfo;
 34 
 35         return NF_QUEUE_NR(tinfo->queuenum);
 36 }
 37 
 38 static unsigned int
 39 nfqueue_tg_v1(struct sk_buff *skb, const struct xt_action_param *par)
 40 {
 41         const struct xt_NFQ_info_v1 *info = par->targinfo;
 42         u32 queue = info->queuenum;
 43 
 44         if (info->queues_total > 1) {
 45                 queue = nfqueue_hash(skb, queue, info->queues_total,
 46                                      par->family, jhash_initval);
 47         }
 48         return NF_QUEUE_NR(queue);
 49 }
 50 
 51 static unsigned int
 52 nfqueue_tg_v2(struct sk_buff *skb, const struct xt_action_param *par)
 53 {
 54         const struct xt_NFQ_info_v2 *info = par->targinfo;
 55         unsigned int ret = nfqueue_tg_v1(skb, par);
 56 
 57         if (info->bypass)
 58                 ret |= NF_VERDICT_FLAG_QUEUE_BYPASS;
 59         return ret;
 60 }
 61 
 62 static int nfqueue_tg_check(const struct xt_tgchk_param *par)
 63 {
 64         const struct xt_NFQ_info_v3 *info = par->targinfo;
 65         u32 maxid;
 66 
 67         init_hashrandom(&jhash_initval);
 68 
 69         if (info->queues_total == 0) {
 70                 pr_err("NFQUEUE: number of total queues is 0\n");
 71                 return -EINVAL;
 72         }
 73         maxid = info->queues_total - 1 + info->queuenum;
 74         if (maxid > 0xffff) {
 75                 pr_err("NFQUEUE: number of queues (%u) out of range (got %u)\n",
 76                        info->queues_total, maxid);
 77                 return -ERANGE;
 78         }
 79         if (par->target->revision == 2 && info->flags > 1)
 80                 return -EINVAL;
 81         if (par->target->revision == 3 && info->flags & ~NFQ_FLAG_MASK)
 82                 return -EINVAL;
 83 
 84         return 0;
 85 }
 86 
 87 static unsigned int
 88 nfqueue_tg_v3(struct sk_buff *skb, const struct xt_action_param *par)
 89 {
 90         const struct xt_NFQ_info_v3 *info = par->targinfo;
 91         u32 queue = info->queuenum;
 92         int ret;
 93 
 94         if (info->queues_total > 1) {
 95                 if (info->flags & NFQ_FLAG_CPU_FANOUT) {
 96                         int cpu = smp_processor_id();
 97 
 98                         queue = info->queuenum + cpu % info->queues_total;
 99                 } else {
100                         queue = nfqueue_hash(skb, queue, info->queues_total,
101                                              par->family, jhash_initval);
102                 }
103         }
104 
105         ret = NF_QUEUE_NR(queue);
106         if (info->flags & NFQ_FLAG_BYPASS)
107                 ret |= NF_VERDICT_FLAG_QUEUE_BYPASS;
108 
109         return ret;
110 }
111 
112 static struct xt_target nfqueue_tg_reg[] __read_mostly = {
113         {
114                 .name           = "NFQUEUE",
115                 .family         = NFPROTO_UNSPEC,
116                 .target         = nfqueue_tg,
117                 .targetsize     = sizeof(struct xt_NFQ_info),
118                 .me             = THIS_MODULE,
119         },
120         {
121                 .name           = "NFQUEUE",
122                 .revision       = 1,
123                 .family         = NFPROTO_UNSPEC,
124                 .checkentry     = nfqueue_tg_check,
125                 .target         = nfqueue_tg_v1,
126                 .targetsize     = sizeof(struct xt_NFQ_info_v1),
127                 .me             = THIS_MODULE,
128         },
129         {
130                 .name           = "NFQUEUE",
131                 .revision       = 2,
132                 .family         = NFPROTO_UNSPEC,
133                 .checkentry     = nfqueue_tg_check,
134                 .target         = nfqueue_tg_v2,
135                 .targetsize     = sizeof(struct xt_NFQ_info_v2),
136                 .me             = THIS_MODULE,
137         },
138         {
139                 .name           = "NFQUEUE",
140                 .revision       = 3,
141                 .family         = NFPROTO_UNSPEC,
142                 .checkentry     = nfqueue_tg_check,
143                 .target         = nfqueue_tg_v3,
144                 .targetsize     = sizeof(struct xt_NFQ_info_v3),
145                 .me             = THIS_MODULE,
146         },
147 };
148 
149 static int __init nfqueue_tg_init(void)
150 {
151         return xt_register_targets(nfqueue_tg_reg, ARRAY_SIZE(nfqueue_tg_reg));
152 }
153 
154 static void __exit nfqueue_tg_exit(void)
155 {
156         xt_unregister_targets(nfqueue_tg_reg, ARRAY_SIZE(nfqueue_tg_reg));
157 }
158 
159 module_init(nfqueue_tg_init);
160 module_exit(nfqueue_tg_exit);
161 

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