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/* Shared library add-on to iptables to add CLASSIFY target support. */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <iptables.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv4/ipt_CLASSIFY.h>
#include <linux/types.h>
#include <linux/pkt_sched.h>
/* Function which prints out usage message. */
static void
help(void)
{
printf(
"CLASSIFY target v%s options:\n"
" --set-class [MAJOR:MINOR] Set skb->priority value\n"
"\n",
IPTABLES_VERSION);
}
static struct option opts[] = {
{ "set-class", 1, 0, '1' },
{ 0 }
};
/* Initialize the target. */
static void
init(struct ipt_entry_target *t, unsigned int *nfcache)
{
}
int string_to_priority(const char *s, unsigned int *p)
{
unsigned int i, j;
if (sscanf(s, "%x:%x", &i, &j) != 2)
return 1;
*p = TC_H_MAKE(i<<16, j);
return 0;
}
/* Function which parses command options; returns true if it
ate an option */
static int
parse(int c, char **argv, int invert, unsigned int *flags,
const struct ipt_entry *entry,
struct ipt_entry_target **target)
{
struct ipt_classify_target_info *clinfo
= (struct ipt_classify_target_info *)(*target)->data;
switch (c) {
case '1':
if (string_to_priority(optarg, &clinfo->priority))
exit_error(PARAMETER_PROBLEM,
"Bad class value `%s'", optarg);
if (*flags)
exit_error(PARAMETER_PROBLEM,
"CLASSIFY: Can't specify --set-class twice");
*flags = 1;
break;
default:
return 0;
}
return 1;
}
static void
final_check(unsigned int flags)
{
if (!flags)
exit_error(PARAMETER_PROBLEM,
"CLASSIFY: Parameter --set-class is required");
}
static void
print_class(unsigned int priority, int numeric)
{
printf("%x:%x ", TC_H_MAJ(priority)>>16, TC_H_MIN(priority));
}
/* Prints out the targinfo. */
static void
print(const struct ipt_ip *ip,
const struct ipt_entry_target *target,
int numeric)
{
const struct ipt_classify_target_info *clinfo =
(const struct ipt_classify_target_info *)target->data;
printf("CLASSIFY set ");
print_class(clinfo->priority, numeric);
}
/* Saves the union ipt_targinfo in parsable form to stdout. */
static void
save(const struct ipt_ip *ip, const struct ipt_entry_target *target)
{
const struct ipt_classify_target_info *clinfo =
(const struct ipt_classify_target_info *)target->data;
printf("--set-class %.4x:%.4x ",
TC_H_MAJ(clinfo->priority)>>16, TC_H_MIN(clinfo->priority));
}
static struct iptables_target classify = {
.next = NULL,
.name = "CLASSIFY",
.version = IPTABLES_VERSION,
.size = IPT_ALIGN(sizeof(struct ipt_classify_target_info)),
.userspacesize = IPT_ALIGN(sizeof(struct ipt_classify_target_info)),
.help = &help,
.init = &init,
.parse = &parse,
.final_check = &final_check,
.print = &print,
.save = &save,
.extra_opts = opts
};
void _init(void)
{
register_target(&classify);
}
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