blob: 2a6ae1755d3ee100ed2010b9277367a2ea7c54ca [file] [log] [blame]
/*
* ipfou.c FOU (foo over UDP) support
*
* 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.
*
* Authors: Tom Herbert <therbert@google.com>
*/
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <net/if.h>
#include <linux/fou.h>
#include <linux/genetlink.h>
#include <linux/ip.h>
#include <arpa/inet.h>
#include "libgenl.h"
#include "utils.h"
#include "ip_common.h"
static void usage(void)
{
fprintf(stderr, "Usage: ip fou add port PORT { ipproto PROTO | gue }\n");
fprintf(stderr, " ip fou del port PORT\n");
fprintf(stderr, "\n");
fprintf(stderr, "Where: PROTO { ipproto-name | 1..255 }\n");
fprintf(stderr, " PORT { 1..65535 }\n");
exit(-1);
}
/* netlink socket */
static struct rtnl_handle genl_rth = { .fd = -1 };
static int genl_family = -1;
#define FOU_REQUEST(_req, _bufsiz, _cmd, _flags) \
GENL_REQUEST(_req, _bufsiz, genl_family, 0, \
FOU_GENL_VERSION, _cmd, _flags)
static int fou_parse_opt(int argc, char **argv, struct nlmsghdr *n,
bool adding)
{
__u16 port;
int port_set = 0;
__u8 ipproto, type;
bool gue_set = false;
int ipproto_set = 0;
while (argc > 0) {
if (!matches(*argv, "port")) {
NEXT_ARG();
if (get_be16(&port, *argv, 0) || port == 0)
invarg("invalid port", *argv);
port_set = 1;
} else if (!matches(*argv, "ipproto")) {
struct protoent *servptr;
NEXT_ARG();
servptr = getprotobyname(*argv);
if (servptr)
ipproto = servptr->p_proto;
else if (get_u8(&ipproto, *argv, 0) || ipproto == 0)
invarg("invalid ipproto", *argv);
ipproto_set = 1;
} else if (!matches(*argv, "gue")) {
gue_set = true;
} else {
fprintf(stderr, "fou: unknown command \"%s\"?\n", *argv);
usage();
return -1;
}
argc--, argv++;
}
if (!port_set) {
fprintf(stderr, "fou: missing port\n");
return -1;
}
if (!ipproto_set && !gue_set && adding) {
fprintf(stderr, "fou: must set ipproto or gue\n");
return -1;
}
if (ipproto_set && gue_set) {
fprintf(stderr, "fou: cannot set ipproto and gue\n");
return -1;
}
type = gue_set ? FOU_ENCAP_GUE : FOU_ENCAP_DIRECT;
addattr16(n, 1024, FOU_ATTR_PORT, port);
addattr8(n, 1024, FOU_ATTR_TYPE, type);
if (ipproto_set)
addattr8(n, 1024, FOU_ATTR_IPPROTO, ipproto);
return 0;
}
static int do_add(int argc, char **argv)
{
FOU_REQUEST(req, 1024, FOU_CMD_ADD, NLM_F_REQUEST);
fou_parse_opt(argc, argv, &req.n, true);
if (rtnl_talk(&genl_rth, &req.n, NULL, 0) < 0)
return -2;
return 0;
}
static int do_del(int argc, char **argv)
{
FOU_REQUEST(req, 1024, FOU_CMD_DEL, NLM_F_REQUEST);
fou_parse_opt(argc, argv, &req.n, false);
if (rtnl_talk(&genl_rth, &req.n, NULL, 0) < 0)
return -2;
return 0;
}
int do_ipfou(int argc, char **argv)
{
if (genl_family < 0) {
if (rtnl_open_byproto(&genl_rth, 0, NETLINK_GENERIC) < 0) {
fprintf(stderr, "Cannot open generic netlink socket\n");
exit(1);
}
genl_family = genl_resolve_family(&genl_rth, FOU_GENL_NAME);
if (genl_family < 0)
exit(1);
}
if (argc < 1)
usage();
if (matches(*argv, "add") == 0)
return do_add(argc-1, argv+1);
if (matches(*argv, "delete") == 0)
return do_del(argc-1, argv+1);
if (matches(*argv, "help") == 0)
usage();
fprintf(stderr, "Command \"%s\" is unknown, try \"ip fou help\".\n", *argv);
exit(-1);
}