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[iptables.git] / extensions / libip6t_NFQUEUE.c
1 /* Shared library add-on to ip666666tables for NFQ
2  *
3  * (C) 2005 by Harald Welte <laforge@netfilter.org>
4  *
5  * This program is distributed under the terms of GNU GPL v2, 1991
6  *
7  */
8 #include <stdio.h>
9 #include <string.h>
10 #include <stdlib.h>
11 #include <getopt.h>
12
13 #include <ip6tables.h>
14 #include <linux/netfilter_ipv6/ip6_tables.h>
15 #include <linux/netfilter_ipv4/ipt_NFQUEUE.h>
16
17 static void init(struct ip6t_entry_target *t, unsigned int *nfcache) 
18 {
19 }
20
21 static void help(void) 
22 {
23         printf(
24 "NFQUEUE target options\n"
25 "  --queue-num value            Send packet to QUEUE number <value>.\n"
26 "                               Valid queue numbers are 0-65535\n"
27 );
28 }
29
30 static struct option opts[] = {
31         { "queue-num", 1, 0, 'F' },
32         { 0 }
33 };
34
35 static void
36 parse_num(const char *s, struct ipt_NFQ_info *tinfo)
37 {
38         unsigned int num;
39        
40         if (string_to_number(s, 0, 65535, &num) == -1)
41                 exit_error(PARAMETER_PROBLEM,
42                            "Invalid queue number `%s'\n", s);
43
44         tinfo->queuenum = num & 0xffff;
45         return;
46 }
47
48 static int
49 parse(int c, char **argv, int invert, unsigned int *flags,
50       const struct ip6t_entry *entry,
51       struct ip6t_entry_target **target)
52 {
53         struct ipt_NFQ_info *tinfo
54                 = (struct ipt_NFQ_info *)(*target)->data;
55
56         switch (c) {
57         case 'F':
58                 if (*flags)
59                         exit_error(PARAMETER_PROBLEM, "NFQUEUE target: "
60                                    "Only use --queue-num ONCE!");
61                 parse_num(optarg, tinfo);
62                 break;
63         default:
64                 return 0;
65         }
66
67         return 1;
68 }
69
70 static void
71 final_check(unsigned int flags)
72 {
73 }
74
75 /* Prints out the targinfo. */
76 static void
77 print(const struct ip6t_ip6 *ip,
78       const struct ip6t_entry_target *target,
79       int numeric)
80 {
81         const struct ipt_NFQ_info *tinfo =
82                 (const struct ipt_NFQ_info *)target->data;
83         printf("NFQUEUE num %u", tinfo->queuenum);
84 }
85
86 /* Saves the union ip6t_targinfo in parsable form to stdout. */
87 static void
88 save(const struct ip6t_ip6 *ip, const struct ip6t_entry_target *target)
89 {
90         const struct ipt_NFQ_info *tinfo =
91                 (const struct ipt_NFQ_info *)target->data;
92
93         printf("--queue-num %u ", tinfo->queuenum);
94 }
95
96 static struct ip6tables_target nfqueue = { 
97         .next           = NULL,
98         .name           = "NFQUEUE",
99         .version        = IPTABLES_VERSION,
100         .size           = IP6T_ALIGN(sizeof(struct ipt_NFQ_info)),
101         .userspacesize  = IP6T_ALIGN(sizeof(struct ipt_NFQ_info)),
102         .help           = &help,
103         .init           = &init,
104         .parse          = &parse,
105         .final_check    = &final_check,
106         .print          = &print,
107         .save           = &save,
108         .extra_opts     = opts
109 };
110
111 void _init(void)
112 {
113         register_target6(&nfqueue);
114 }