libipt_ULOG.c revision 1f2474ae5276e49005c8e234dec091b007e3fce2 
1/* Shared library add-on to iptables to add ULOG support.
2 *
3 * (C) 2000 by Harald Welte <laforge@gnumonks.org>
4 *
5 * multipart netlink support based on ideas by Sebastian Zander
6 * 						<zander@fokus.gmd.de>
7 *
8 * This software is released under the terms of GNU GPL
9 *
10 * libipt_ULOG.c,v 1.7 2001/01/30 11:55:02 laforge Exp
11 */
12#include <stdio.h>
13#include <string.h>
14#include <xtables.h>
15/* For 64bit kernel / 32bit userspace */
16#include <linux/netfilter_ipv4/ipt_ULOG.h>
17
18enum {
19	O_ULOG_NLGROUP = 0,
20	O_ULOG_PREFIX,
21	O_ULOG_CPRANGE,
22	O_ULOG_QTHR,
23};
24
25static void ULOG_help(void)
26{
27	printf("ULOG target options:\n"
28	       " --ulog-nlgroup nlgroup		NETLINK group used for logging\n"
29	       " --ulog-cprange size		Bytes of each packet to be passed\n"
30	       " --ulog-qthreshold		Threshold of in-kernel queue\n"
31	       " --ulog-prefix prefix		Prefix log messages with this prefix.\n");
32}
33
34static const struct xt_option_entry ULOG_opts[] = {
35	{.name = "ulog-nlgroup", .id = O_ULOG_NLGROUP, .type = XTTYPE_UINT8,
36	 .min = 1, .max = 32},
37	{.name = "ulog-prefix", .id = O_ULOG_PREFIX, .type = XTTYPE_STRING,
38	 .flags = XTOPT_PUT, XTOPT_POINTER(struct ipt_ulog_info, prefix),
39	 .min = 1},
40	{.name = "ulog-cprange", .id = O_ULOG_CPRANGE, .type = XTTYPE_UINT64,
41	 .min = 1, .max = ULOG_MAX_QLEN},
42	{.name = "ulog-qthreshold", .id = O_ULOG_QTHR, .type = XTTYPE_UINT64},
43	XTOPT_TABLEEND,
44};
45
46static void ULOG_init(struct xt_entry_target *t)
47{
48	struct ipt_ulog_info *loginfo = (struct ipt_ulog_info *) t->data;
49
50	loginfo->nl_group = ULOG_DEFAULT_NLGROUP;
51	loginfo->qthreshold = ULOG_DEFAULT_QTHRESHOLD;
52
53}
54
55static void ULOG_parse(struct xt_option_call *cb)
56{
57	struct ipt_ulog_info *loginfo = cb->data;
58
59	xtables_option_parse(cb);
60	switch (cb->entry->id) {
61	case O_ULOG_NLGROUP:
62		loginfo->nl_group = 1 << (cb->val.u8 - 1);
63		break;
64	case O_ULOG_PREFIX:
65		if (strchr(cb->arg, '\n') != NULL)
66			xtables_error(PARAMETER_PROBLEM,
67				   "Newlines not allowed in --ulog-prefix");
68		break;
69	case O_ULOG_CPRANGE:
70		loginfo->copy_range = cb->val.u64;
71		break;
72	case O_ULOG_QTHR:
73		loginfo->qthreshold = cb->val.u64;
74		break;
75	}
76}
77
78static void ULOG_save(const void *ip, const struct xt_entry_target *target)
79{
80	const struct ipt_ulog_info *loginfo
81	    = (const struct ipt_ulog_info *) target->data;
82
83	if (strcmp(loginfo->prefix, "") != 0) {
84		fputs(" --ulog-prefix", stdout);
85		xtables_save_string(loginfo->prefix);
86	}
87
88	if (loginfo->nl_group != ULOG_DEFAULT_NLGROUP)
89		printf(" --ulog-nlgroup %d", ffs(loginfo->nl_group));
90	if (loginfo->copy_range)
91		printf(" --ulog-cprange %u", (unsigned int)loginfo->copy_range);
92
93	if (loginfo->qthreshold != ULOG_DEFAULT_QTHRESHOLD)
94		printf(" --ulog-qthreshold %u", (unsigned int)loginfo->qthreshold);
95}
96
97static void ULOG_print(const void *ip, const struct xt_entry_target *target,
98                       int numeric)
99{
100	const struct ipt_ulog_info *loginfo
101	    = (const struct ipt_ulog_info *) target->data;
102
103	printf(" ULOG ");
104	printf("copy_range %u nlgroup %d", (unsigned int)loginfo->copy_range,
105	       ffs(loginfo->nl_group));
106	if (strcmp(loginfo->prefix, "") != 0)
107		printf(" prefix \"%s\"", loginfo->prefix);
108	printf(" queue_threshold %u", (unsigned int)loginfo->qthreshold);
109}
110
111static struct xtables_target ulog_tg_reg = {
112	.name		= "ULOG",
113	.version	= XTABLES_VERSION,
114	.family		= NFPROTO_IPV4,
115	.size		= XT_ALIGN(sizeof(struct ipt_ulog_info)),
116	.userspacesize	= XT_ALIGN(sizeof(struct ipt_ulog_info)),
117	.help		= ULOG_help,
118	.init		= ULOG_init,
119	.print		= ULOG_print,
120	.save		= ULOG_save,
121	.x6_parse	= ULOG_parse,
122	.x6_options	= ULOG_opts,
123};
124
125void _init(void)
126{
127	xtables_register_target(&ulog_tg_reg);
128}
129