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 <strings.h>
15#include <xtables.h>
16/* For 64bit kernel / 32bit userspace */
17#include <linux/netfilter_ipv4/ipt_ULOG.h>
18
19enum {
20	O_ULOG_NLGROUP = 0,
21	O_ULOG_PREFIX,
22	O_ULOG_CPRANGE,
23	O_ULOG_QTHR,
24};
25
26static void ULOG_help(void)
27{
28	printf("ULOG target options:\n"
29	       " --ulog-nlgroup nlgroup		NETLINK group used for logging\n"
30	       " --ulog-cprange size		Bytes of each packet to be passed\n"
31	       " --ulog-qthreshold		Threshold of in-kernel queue\n"
32	       " --ulog-prefix prefix		Prefix log messages with this prefix.\n");
33}
34
35static const struct xt_option_entry ULOG_opts[] = {
36	{.name = "ulog-nlgroup", .id = O_ULOG_NLGROUP, .type = XTTYPE_UINT8,
37	 .min = 1, .max = 32},
38	{.name = "ulog-prefix", .id = O_ULOG_PREFIX, .type = XTTYPE_STRING,
39	 .flags = XTOPT_PUT, XTOPT_POINTER(struct ipt_ulog_info, prefix),
40	 .min = 1},
41	{.name = "ulog-cprange", .id = O_ULOG_CPRANGE, .type = XTTYPE_UINT64},
42	{.name = "ulog-qthreshold", .id = O_ULOG_QTHR, .type = XTTYPE_UINT64,
43	 .min = 1, .max = ULOG_MAX_QLEN},
44	XTOPT_TABLEEND,
45};
46
47static void ULOG_init(struct xt_entry_target *t)
48{
49	struct ipt_ulog_info *loginfo = (struct ipt_ulog_info *) t->data;
50
51	loginfo->nl_group = ULOG_DEFAULT_NLGROUP;
52	loginfo->qthreshold = ULOG_DEFAULT_QTHRESHOLD;
53
54}
55
56static void ULOG_parse(struct xt_option_call *cb)
57{
58	struct ipt_ulog_info *loginfo = cb->data;
59
60	xtables_option_parse(cb);
61	switch (cb->entry->id) {
62	case O_ULOG_NLGROUP:
63		loginfo->nl_group = 1 << (cb->val.u8 - 1);
64		break;
65	case O_ULOG_PREFIX:
66		if (strchr(cb->arg, '\n') != NULL)
67			xtables_error(PARAMETER_PROBLEM,
68				   "Newlines not allowed in --ulog-prefix");
69		break;
70	case O_ULOG_CPRANGE:
71		loginfo->copy_range = cb->val.u64;
72		break;
73	case O_ULOG_QTHR:
74		loginfo->qthreshold = cb->val.u64;
75		break;
76	}
77}
78
79static void ULOG_save(const void *ip, const struct xt_entry_target *target)
80{
81	const struct ipt_ulog_info *loginfo
82	    = (const struct ipt_ulog_info *) target->data;
83
84	if (strcmp(loginfo->prefix, "") != 0) {
85		fputs(" --ulog-prefix", stdout);
86		xtables_save_string(loginfo->prefix);
87	}
88
89	if (loginfo->nl_group != ULOG_DEFAULT_NLGROUP)
90		printf(" --ulog-nlgroup %d", ffs(loginfo->nl_group));
91	if (loginfo->copy_range)
92		printf(" --ulog-cprange %u", (unsigned int)loginfo->copy_range);
93
94	if (loginfo->qthreshold != ULOG_DEFAULT_QTHRESHOLD)
95		printf(" --ulog-qthreshold %u", (unsigned int)loginfo->qthreshold);
96}
97
98static void ULOG_print(const void *ip, const struct xt_entry_target *target,
99                       int numeric)
100{
101	const struct ipt_ulog_info *loginfo
102	    = (const struct ipt_ulog_info *) target->data;
103
104	printf(" ULOG ");
105	printf("copy_range %u nlgroup %d", (unsigned int)loginfo->copy_range,
106	       ffs(loginfo->nl_group));
107	if (strcmp(loginfo->prefix, "") != 0)
108		printf(" prefix \"%s\"", loginfo->prefix);
109	printf(" queue_threshold %u", (unsigned int)loginfo->qthreshold);
110}
111
112static struct xtables_target ulog_tg_reg = {
113	.name		= "ULOG",
114	.version	= XTABLES_VERSION,
115	.family		= NFPROTO_IPV4,
116	.size		= XT_ALIGN(sizeof(struct ipt_ulog_info)),
117	.userspacesize	= XT_ALIGN(sizeof(struct ipt_ulog_info)),
118	.help		= ULOG_help,
119	.init		= ULOG_init,
120	.print		= ULOG_print,
121	.save		= ULOG_save,
122	.x6_parse	= ULOG_parse,
123	.x6_options	= ULOG_opts,
124};
125
126void _init(void)
127{
128	xtables_register_target(&ulog_tg_reg);
129}
130