libxt_CLASSIFY.c revision e4cc20b2367362c2f9c84c0daaccd985e3236118 
1/* Shared library add-on to iptables to add CLASSIFY target support. */
2#include <stdio.h>
3#include <string.h>
4#include <stdlib.h>
5#include <getopt.h>
6
7#include <xtables.h>
8#include <linux/netfilter/x_tables.h>
9#include <linux/netfilter/xt_CLASSIFY.h>
10#include <linux/types.h>
11#include <linux/pkt_sched.h>
12
13/* Function which prints out usage message. */
14static void
15help(void)
16{
17	printf(
18"CLASSIFY target v%s options:\n"
19"  --set-class [MAJOR:MINOR]    Set skb->priority value\n"
20"\n",
21IPTABLES_VERSION);
22}
23
24static const struct option opts[] = {
25	{ "set-class", 1, 0, '1' },
26	{ 0 }
27};
28
29/* Initialize the target. */
30static void
31init(struct xt_entry_target *t, unsigned int *nfcache)
32{
33}
34
35int string_to_priority(const char *s, unsigned int *p)
36{
37	unsigned int i, j;
38
39	if (sscanf(s, "%x:%x", &i, &j) != 2)
40		return 1;
41
42	*p = TC_H_MAKE(i<<16, j);
43	return 0;
44}
45
46/* Function which parses command options; returns true if it
47   ate an option */
48static int
49parse(int c, char **argv, int invert, unsigned int *flags,
50      const void *entry,
51      struct xt_entry_target **target)
52{
53	struct xt_classify_target_info *clinfo
54		= (struct xt_classify_target_info *)(*target)->data;
55
56	switch (c) {
57	case '1':
58		if (string_to_priority(optarg, &clinfo->priority))
59			exit_error(PARAMETER_PROBLEM,
60				   "Bad class value `%s'", optarg);
61		if (*flags)
62			exit_error(PARAMETER_PROBLEM,
63			           "CLASSIFY: Can't specify --set-class twice");
64		*flags = 1;
65		break;
66
67	default:
68		return 0;
69	}
70
71	return 1;
72}
73
74static void
75final_check(unsigned int flags)
76{
77	if (!flags)
78		exit_error(PARAMETER_PROBLEM,
79		           "CLASSIFY: Parameter --set-class is required");
80}
81
82static void
83print_class(unsigned int priority, int numeric)
84{
85	printf("%x:%x ", TC_H_MAJ(priority)>>16, TC_H_MIN(priority));
86}
87
88/* Prints out the targinfo. */
89static void
90print(const void *ip,
91      const struct xt_entry_target *target,
92      int numeric)
93{
94	const struct xt_classify_target_info *clinfo =
95		(const struct xt_classify_target_info *)target->data;
96	printf("CLASSIFY set ");
97	print_class(clinfo->priority, numeric);
98}
99
100/* Saves the union ipt_targinfo in parsable form to stdout. */
101static void
102save(const void *ip, const struct xt_entry_target *target)
103{
104	const struct xt_classify_target_info *clinfo =
105		(const struct xt_classify_target_info *)target->data;
106
107	printf("--set-class %.4x:%.4x ",
108	       TC_H_MAJ(clinfo->priority)>>16, TC_H_MIN(clinfo->priority));
109}
110
111static struct xtables_target classify = {
112	.family		= AF_INET,
113	.name		= "CLASSIFY",
114	.version	= IPTABLES_VERSION,
115	.size		= XT_ALIGN(sizeof(struct xt_classify_target_info)),
116	.userspacesize	= XT_ALIGN(sizeof(struct xt_classify_target_info)),
117	.help		= &help,
118	.init		= &init,
119	.parse		= &parse,
120	.final_check	= &final_check,
121	.print		= &print,
122	.save		= &save,
123	.extra_opts	= opts,
124};
125
126static struct xtables_target classify6 = {
127	.family		= AF_INET6,
128	.name		= "CLASSIFY",
129	.version	= IPTABLES_VERSION,
130	.size		= XT_ALIGN(sizeof(struct xt_classify_target_info)),
131	.userspacesize	= XT_ALIGN(sizeof(struct xt_classify_target_info)),
132	.help		= &help,
133	.init		= &init,
134	.parse		= &parse,
135	.final_check	= &final_check,
136	.print		= &print,
137	.save		= &save,
138	.extra_opts	= opts,
139};
140
141void _init(void)
142{
143	xtables_register_target(&classify);
144	xtables_register_target(&classify6);
145}
146