libxt_CLASSIFY.c revision 1829ed482efbc8b390cc760d012b3a4450494e1a 
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
13static void
14CLASSIFY_help(void)
15{
16	printf(
17"CLASSIFY target options:\n"
18"  --set-class [MAJOR:MINOR]    Set skb->priority value\n");
19}
20
21static const struct option CLASSIFY_opts[] = {
22	{ "set-class", 1, NULL, '1' },
23	{ .name = NULL }
24};
25
26static int CLASSIFY_string_to_priority(const char *s, unsigned int *p)
27{
28	unsigned int i, j;
29
30	if (sscanf(s, "%x:%x", &i, &j) != 2)
31		return 1;
32
33	*p = TC_H_MAKE(i<<16, j);
34	return 0;
35}
36
37static int
38CLASSIFY_parse(int c, char **argv, int invert, unsigned int *flags,
39      const void *entry,
40      struct xt_entry_target **target)
41{
42	struct xt_classify_target_info *clinfo
43		= (struct xt_classify_target_info *)(*target)->data;
44
45	switch (c) {
46	case '1':
47		if (CLASSIFY_string_to_priority(optarg, &clinfo->priority))
48			xtables_error(PARAMETER_PROBLEM,
49				   "Bad class value `%s'", optarg);
50		if (*flags)
51			xtables_error(PARAMETER_PROBLEM,
52			           "CLASSIFY: Can't specify --set-class twice");
53		*flags = 1;
54		break;
55
56	default:
57		return 0;
58	}
59
60	return 1;
61}
62
63static void
64CLASSIFY_final_check(unsigned int flags)
65{
66	if (!flags)
67		xtables_error(PARAMETER_PROBLEM,
68		           "CLASSIFY: Parameter --set-class is required");
69}
70
71static void
72CLASSIFY_print_class(unsigned int priority, int numeric)
73{
74	printf("%x:%x ", TC_H_MAJ(priority)>>16, TC_H_MIN(priority));
75}
76
77static void
78CLASSIFY_print(const void *ip,
79      const struct xt_entry_target *target,
80      int numeric)
81{
82	const struct xt_classify_target_info *clinfo =
83		(const struct xt_classify_target_info *)target->data;
84	printf("CLASSIFY set ");
85	CLASSIFY_print_class(clinfo->priority, numeric);
86}
87
88static void
89CLASSIFY_save(const void *ip, const struct xt_entry_target *target)
90{
91	const struct xt_classify_target_info *clinfo =
92		(const struct xt_classify_target_info *)target->data;
93
94	printf("--set-class %.4x:%.4x ",
95	       TC_H_MAJ(clinfo->priority)>>16, TC_H_MIN(clinfo->priority));
96}
97
98static struct xtables_target classify_target = {
99	.family		= AF_UNSPEC,
100	.name		= "CLASSIFY",
101	.version	= XTABLES_VERSION,
102	.size		= XT_ALIGN(sizeof(struct xt_classify_target_info)),
103	.userspacesize	= XT_ALIGN(sizeof(struct xt_classify_target_info)),
104	.help		= CLASSIFY_help,
105	.parse		= CLASSIFY_parse,
106	.final_check	= CLASSIFY_final_check,
107	.print		= CLASSIFY_print,
108	.save		= CLASSIFY_save,
109	.extra_opts	= CLASSIFY_opts,
110};
111
112void _init(void)
113{
114	xtables_register_target(&classify_target);
115}
116