/*
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* ipfou.c FOU (foo over UDP) support
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Tom Herbert <therbert@google.com>
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*/
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#include <netdb.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <net/if.h>
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#include <linux/fou.h>
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#include <linux/genetlink.h>
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#include <linux/ip.h>
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#include <arpa/inet.h>
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#include "libgenl.h"
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#include "utils.h"
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#include "ip_common.h"
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static void usage(void)
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{
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fprintf(stderr, "Usage: ip fou add port PORT "
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"{ ipproto PROTO | gue } [ -6 ]\n");
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fprintf(stderr, " ip fou del port PORT [ -6 ]\n");
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fprintf(stderr, "\n");
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fprintf(stderr, "Where: PROTO { ipproto-name | 1..255 }\n");
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fprintf(stderr, " PORT { 1..65535 }\n");
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exit(-1);
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}
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/* netlink socket */
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static struct rtnl_handle genl_rth = { .fd = -1 };
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static int genl_family = -1;
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#define FOU_REQUEST(_req, _bufsiz, _cmd, _flags) \
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GENL_REQUEST(_req, _bufsiz, genl_family, 0, \
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FOU_GENL_VERSION, _cmd, _flags)
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static int fou_parse_opt(int argc, char **argv, struct nlmsghdr *n,
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bool adding)
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{
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__u16 port;
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int port_set = 0;
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__u8 ipproto, type;
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bool gue_set = false;
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int ipproto_set = 0;
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unsigned short family = AF_INET;
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while (argc > 0) {
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if (!matches(*argv, "port")) {
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NEXT_ARG();
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if (get_be16(&port, *argv, 0) || port == 0)
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invarg("invalid port", *argv);
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port_set = 1;
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} else if (!matches(*argv, "ipproto")) {
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struct protoent *servptr;
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NEXT_ARG();
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servptr = getprotobyname(*argv);
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if (servptr)
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ipproto = servptr->p_proto;
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else if (get_u8(&ipproto, *argv, 0) || ipproto == 0)
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invarg("invalid ipproto", *argv);
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ipproto_set = 1;
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} else if (!matches(*argv, "gue")) {
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gue_set = true;
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} else if (!matches(*argv, "-6")) {
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family = AF_INET6;
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} else {
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fprintf(stderr, "fou: unknown command \"%s\"?\n", *argv);
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usage();
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return -1;
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}
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argc--, argv++;
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}
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if (!port_set) {
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fprintf(stderr, "fou: missing port\n");
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return -1;
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}
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if (!ipproto_set && !gue_set && adding) {
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fprintf(stderr, "fou: must set ipproto or gue\n");
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return -1;
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}
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if (ipproto_set && gue_set) {
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fprintf(stderr, "fou: cannot set ipproto and gue\n");
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return -1;
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}
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type = gue_set ? FOU_ENCAP_GUE : FOU_ENCAP_DIRECT;
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addattr16(n, 1024, FOU_ATTR_PORT, port);
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addattr8(n, 1024, FOU_ATTR_TYPE, type);
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addattr16(n, 1024, FOU_ATTR_AF, family);
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if (ipproto_set)
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addattr8(n, 1024, FOU_ATTR_IPPROTO, ipproto);
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return 0;
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}
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static int do_add(int argc, char **argv)
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{
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FOU_REQUEST(req, 1024, FOU_CMD_ADD, NLM_F_REQUEST);
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fou_parse_opt(argc, argv, &req.n, true);
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if (rtnl_talk(&genl_rth, &req.n, NULL, 0) < 0)
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return -2;
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return 0;
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}
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static int do_del(int argc, char **argv)
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{
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FOU_REQUEST(req, 1024, FOU_CMD_DEL, NLM_F_REQUEST);
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fou_parse_opt(argc, argv, &req.n, false);
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if (rtnl_talk(&genl_rth, &req.n, NULL, 0) < 0)
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return -2;
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return 0;
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}
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int do_ipfou(int argc, char **argv)
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{
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if (argc < 1)
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usage();
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if (matches(*argv, "help") == 0)
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usage();
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if (genl_init_handle(&genl_rth, FOU_GENL_NAME, &genl_family))
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exit(1);
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if (matches(*argv, "add") == 0)
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return do_add(argc-1, argv+1);
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if (matches(*argv, "delete") == 0)
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return do_del(argc-1, argv+1);
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fprintf(stderr, "Command \"%s\" is unknown, try \"ip fou help\".\n", *argv);
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exit(-1);
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}
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