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/*
* (C) 2009 by Pablo Neira Ayuso <pablo@netfilter.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
*/
#include <stdio.h>
#include <getopt.h>
#include <stdlib.h>
#include <netinet/in.h> /* For htons */
#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
#include "conntrack.h"
#ifndef IPPROTO_UDPLITE
#define IPPROTO_UDPLITE 136
#endif
enum {
CT_UDPLITE_ORIG_SPORT = (1 << 0),
CT_UDPLITE_ORIG_DPORT = (1 << 1),
CT_UDPLITE_REPL_SPORT = (1 << 2),
CT_UDPLITE_REPL_DPORT = (1 << 3),
CT_UDPLITE_MASK_SPORT = (1 << 4),
CT_UDPLITE_MASK_DPORT = (1 << 5),
CT_UDPLITE_EXPTUPLE_SPORT = (1 << 6),
CT_UDPLITE_EXPTUPLE_DPORT = (1 << 7)
};
#define UDP_OPT_MAX 11
static struct option opts[UDP_OPT_MAX] = {
{ .name = "orig-port-src", .has_arg = 1, .val = '1' },
{ .name = "orig-port-dst", .has_arg = 1, .val = '2' },
{ .name = "reply-port-src", .has_arg = 1, .val = '3' },
{ .name = "reply-port-dst", .has_arg = 1, .val = '4' },
{ .name = "mask-port-src", .has_arg = 1, .val = '5' },
{ .name = "mask-port-dst", .has_arg = 1, .val = '6' },
{ .name = "tuple-port-src", .has_arg = 1, .val = '7' },
{ .name = "tuple-port-dst", .has_arg = 1, .val = '8' },
{ .name = "sport", .has_arg = 1, .val = '1' },
{ .name = "dport", .has_arg = 1, .val = '2' },
{0, 0, 0, 0}
};
static const char *udplite_optflags[UDP_OPT_MAX] = {
[0] = "sport",
[1] = "dport",
[2] = "reply-port-src",
[3] = "reply-port-dst",
[4] = "mask-port-src",
[5] = "mask-port-dst",
[6] = "tuple-port-src",
[7] = "tuple-port-dst"
};
static void help(void)
{
fprintf(stdout, " --orig-port-src\t\toriginal source port\n");
fprintf(stdout, " --orig-port-dst\t\toriginal destination port\n");
fprintf(stdout, " --reply-port-src\t\treply source port\n");
fprintf(stdout, " --reply-port-dst\t\treply destination port\n");
fprintf(stdout, " --mask-port-src\t\tmask source port\n");
fprintf(stdout, " --mask-port-dst\t\tmask destination port\n");
fprintf(stdout, " --tuple-port-src\t\texpectation tuple src port\n");
fprintf(stdout, " --tuple-port-src\t\texpectation tuple dst port\n");
}
static char udplite_commands_v_options[NUMBER_OF_CMD][UDP_OPT_MAX] =
{
/* 1 2 3 4 5 6 7 8 */
/*CT_LIST*/ {2,2,2,2,0,0,0,0},
/*CT_CREATE*/ {3,3,3,3,0,0,0,0},
/*CT_UPDATE*/ {2,2,2,2,0,0,0,0},
/*CT_DELETE*/ {2,2,2,2,0,0,0,0},
/*CT_GET*/ {3,3,3,3,0,0,0,0},
/*CT_FLUSH*/ {0,0,0,0,0,0,0,0},
/*CT_EVENT*/ {2,2,2,2,0,0,0,0},
/*CT_VERSION*/ {0,0,0,0,0,0,0,0},
/*CT_HELP*/ {0,0,0,0,0,0,0,0},
/*EXP_LIST*/ {0,0,0,0,0,0,0,0},
/*EXP_CREATE*/ {1,1,0,0,1,1,1,1},
/*EXP_DELETE*/ {1,1,1,1,0,0,0,0},
/*EXP_GET*/ {1,1,1,1,0,0,0,0},
/*EXP_FLUSH*/ {0,0,0,0,0,0,0,0},
/*EXP_EVENT*/ {0,0,0,0,0,0,0,0},
};
static int parse_options(char c,
struct nf_conntrack *ct,
struct nf_conntrack *exptuple,
struct nf_conntrack *mask,
unsigned int *flags)
{
switch(c) {
u_int16_t port;
case '1':
port = htons(atoi(optarg));
nfct_set_attr_u16(ct, ATTR_ORIG_PORT_SRC, port);
nfct_set_attr_u8(ct, ATTR_ORIG_L4PROTO, IPPROTO_UDPLITE);
*flags |= CT_UDPLITE_ORIG_SPORT;
break;
case '2':
port = htons(atoi(optarg));
nfct_set_attr_u16(ct, ATTR_ORIG_PORT_DST, port);
nfct_set_attr_u8(ct, ATTR_ORIG_L4PROTO, IPPROTO_UDPLITE);
*flags |= CT_UDPLITE_ORIG_DPORT;
break;
case '3':
port = htons(atoi(optarg));
nfct_set_attr_u16(ct, ATTR_REPL_PORT_SRC, port);
nfct_set_attr_u8(ct, ATTR_REPL_L4PROTO, IPPROTO_UDPLITE);
*flags |= CT_UDPLITE_REPL_SPORT;
break;
case '4':
port = htons(atoi(optarg));
nfct_set_attr_u16(ct, ATTR_REPL_PORT_DST, port);
nfct_set_attr_u8(ct, ATTR_REPL_L4PROTO, IPPROTO_UDPLITE);
*flags |= CT_UDPLITE_REPL_DPORT;
break;
case '5':
port = htons(atoi(optarg));
nfct_set_attr_u16(mask, ATTR_ORIG_PORT_SRC, port);
nfct_set_attr_u8(mask, ATTR_ORIG_L4PROTO, IPPROTO_UDPLITE);
*flags |= CT_UDPLITE_MASK_SPORT;
break;
case '6':
port = htons(atoi(optarg));
nfct_set_attr_u16(mask, ATTR_ORIG_PORT_DST, port);
nfct_set_attr_u8(mask, ATTR_ORIG_L4PROTO, IPPROTO_UDPLITE);
*flags |= CT_UDPLITE_MASK_DPORT;
break;
case '7':
port = htons(atoi(optarg));
nfct_set_attr_u16(exptuple, ATTR_ORIG_PORT_SRC, port);
nfct_set_attr_u8(exptuple, ATTR_ORIG_L4PROTO, IPPROTO_UDPLITE);
*flags |= CT_UDPLITE_EXPTUPLE_SPORT;
break;
case '8':
port = htons(atoi(optarg));
nfct_set_attr_u16(exptuple, ATTR_ORIG_PORT_DST, port);
nfct_set_attr_u8(exptuple, ATTR_ORIG_L4PROTO, IPPROTO_UDPLITE);
*flags |= CT_UDPLITE_EXPTUPLE_DPORT;
break;
}
return 1;
}
#define UDPLITE_VALID_FLAGS_MAX 2
static unsigned int udplite_valid_flags[UDPLITE_VALID_FLAGS_MAX] = {
CT_UDPLITE_ORIG_SPORT | CT_UDPLITE_ORIG_DPORT,
CT_UDPLITE_REPL_SPORT | CT_UDPLITE_REPL_DPORT,
};
static void
final_check(unsigned int flags, unsigned int cmd, struct nf_conntrack *ct)
{
int ret, partial;
ret = generic_opt_check(flags, UDP_OPT_MAX,
udplite_commands_v_options[cmd],
udplite_optflags,
udplite_valid_flags, UDPLITE_VALID_FLAGS_MAX,
&partial);
if (!ret) {
switch(partial) {
case -1:
case 0:
exit_error(PARAMETER_PROBLEM, "you have to specify "
"`--sport' and "
"`--dport'");
break;
case 1:
exit_error(PARAMETER_PROBLEM, "you have to specify "
"`--reply-src-port' and "
"`--reply-dst-port'");
break;
}
}
}
static struct ctproto_handler udplite = {
.name = "udplite",
.protonum = IPPROTO_UDPLITE,
.parse_opts = parse_options,
.final_check = final_check,
.help = help,
.opts = opts,
.version = VERSION,
};
void register_udplite(void)
{
register_proto(&udplite);
}
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