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/* Shared library add-on to iptables to add byte tracking support. */
#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <iptables.h>
#include <linux/netfilter_ipv4/ip_conntrack.h>
#include <linux/netfilter_ipv4/ipt_connbytes.h>
/* Function which prints out usage message. */
static void
help(void)
{
printf(
"connbytes v%s options:\n"
" [!] --connbytes from:[to]\n"
" --connbytes-dir [original, reply, both]\n"
" --connbytes-mode [packets, bytes, avgpkt]\n"
"\n", IPTABLES_VERSION);
}
static struct option opts[] = {
{ "connbytes", 1, 0, '1' },
{ "connbytes-dir", 1, 0, '2' },
{ "connbytes-mode", 1, 0, '3' },
{0}
};
/* Initialize the match. */
static void
init(struct ipt_entry_match *m, unsigned int *nfcache)
{
/* Can't cache this */
*nfcache |= NFC_UNKNOWN;
}
static void
parse_range(const char *arg, struct ipt_connbytes_info *si)
{
char *colon,*p;
si->count.from = strtoul(arg,&colon,10);
if (*colon != ':')
exit_error(PARAMETER_PROBLEM, "Bad range `%s'", arg);
si->count.to = strtoul(colon+1,&p,10);
if (p == colon+1) {
/* second number omited */
si->count.to = 0xffffffff;
}
if (si->count.from > si->count.to)
exit_error(PARAMETER_PROBLEM, "%llu should be less than %llu",
si->count.from, si->count.to);
}
/* 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,
unsigned int *nfcache,
struct ipt_entry_match **match)
{
struct ipt_connbytes_info *sinfo = (struct ipt_connbytes_info *)(*match)->data;
unsigned long i;
switch (c) {
case '1':
if (check_inverse(optarg, &invert, &optind, 0))
optind++;
parse_range(argv[optind-1], sinfo);
if (invert) {
i = sinfo->count.from;
sinfo->count.from = sinfo->count.to;
sinfo->count.to = i;
}
*flags |= 1;
break;
case '2':
if (!strcmp(optarg, "original"))
sinfo->direction = IPT_CONNBYTES_DIR_ORIGINAL;
else if (!strcmp(optarg, "reply"))
sinfo->direction = IPT_CONNBYTES_DIR_REPLY;
else if (!strcmp(optarg, "both"))
sinfo->direction = IPT_CONNBYTES_DIR_BOTH;
else
exit_error(PARAMETER_PROBLEM,
"Unknown --connbytes-dir `%s'", optarg);
*flags |= 2;
break;
case '3':
if (!strcmp(optarg, "packets"))
sinfo->what = IPT_CONNBYTES_WHAT_PKTS;
else if (!strcmp(optarg, "bytes"))
sinfo->what = IPT_CONNBYTES_WHAT_BYTES;
else if (!strcmp(optarg, "avgpkt"))
sinfo->what = IPT_CONNBYTES_WHAT_AVGPKT;
else
exit_error(PARAMETER_PROBLEM,
"Unknown --connbytes-mode `%s'", optarg);
*flags |= 4;
default:
return 0;
}
return 1;
}
static void final_check(unsigned int flags)
{
if (flags != 7)
exit_error(PARAMETER_PROBLEM, "You must specify `--connbytes'"
"`--connbytes-direction' and `--connbytes-mode'");
}
static void print_mode(struct ipt_connbytes_info *sinfo)
{
switch (sinfo->what) {
case IPT_CONNBYTES_WHAT_PKTS:
fputs("packets ", stdout);
break;
case IPT_CONNBYTES_WHAT_BYTES:
fputs("bytes ", stdout);
break;
case IPT_CONNBYTES_WHAT_AVGPKT:
fputs("avgpkt ", stdout);
break;
default:
fputs("unknown ", stdout);
break;
}
}
static void print_direction(struct ipt_connbytes_info *sinfo)
{
switch (sinfo->direction) {
case IPT_CONNBYTES_DIR_ORIGINAL:
fputs("original ", stdout);
break;
case IPT_CONNBYTES_DIR_REPLY:
fputs("reply ", stdout);
break;
case IPT_CONNBYTES_DIR_BOTH:
fputs("both ", stdout);
break;
default:
fputs("unknown ", stdout);
break;
}
}
/* Prints out the matchinfo. */
static void
print(const struct ipt_ip *ip,
const struct ipt_entry_match *match,
int numeric)
{
struct ipt_connbytes_info *sinfo = (struct ipt_connbytes_info *)match->data;
if (sinfo->count.from > sinfo->count.to)
printf("connbytes ! %llu:%llu ", sinfo->count.to,
sinfo->count.from);
else
printf("connbytes %llu:%llu ",sinfo->count.from,
sinfo->count.to);
fputs("connbytes mode ", stdout);
print_mode(sinfo);
fputs("connbytes direction ", stdout);
print_direction(sinfo);
}
/* Saves the matchinfo in parsable form to stdout. */
static void save(const struct ipt_ip *ip, const struct ipt_entry_match *match)
{
struct ipt_connbytes_info *sinfo = (struct ipt_connbytes_info *)match->data;
if (sinfo->count.from > sinfo->count.to)
printf("! --connbytes %llu:%llu ", sinfo->count.to,
sinfo->count.from);
else
printf("--connbytes %llu:%llu ", sinfo->count.from,
sinfo->count.to);
fputs("--connbytes-mode ", stdout);
print_mode(sinfo);
fputs("--connbytes-direction ", stdout);
print_direction(sinfo);
}
static struct iptables_match state = {
.next = NULL,
.name = "connbytes",
.version = IPTABLES_VERSION,
.size = IPT_ALIGN(sizeof(struct ipt_connbytes_info)),
.userspacesize = IPT_ALIGN(sizeof(struct ipt_connbytes_info)),
.help = &help,
.init = &init,
.parse = &parse,
.final_check = &final_check,
.print = &print,
.save = &save,
.extra_opts = opts
};
void _init(void)
{
register_match(&state);
}
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