1/*
2 * iplink_vxcan.c	vxcan device support (Virtual CAN Tunnel)
3 *
4 *		This program is free software; you can redistribute it and/or
5 *		modify it under the terms of the GNU General Public License
6 *		as published by the Free Software Foundation; either version
7 *		2 of the License, or (at your option) any later version.
8 *
9 * Author:	Oliver Hartkopp <socketcan@hartkopp.net>
10 * Based on:	link_veth.c from Pavel Emelianov <xemul@openvz.org>
11 */
12
13#include <stdio.h>
14#include <stdlib.h>
15#include <string.h>
16#include <net/if.h>
17#include <linux/can/vxcan.h>
18
19#include "utils.h"
20#include "ip_common.h"
21
22static void print_usage(FILE *f)
23{
24	printf("Usage: ip link <options> type vxcan [peer <options>]\n"
25	       "To get <options> type 'ip link add help'\n");
26}
27
28static void usage(void)
29{
30	print_usage(stderr);
31}
32
33static int vxcan_parse_opt(struct link_util *lu, int argc, char **argv,
34			  struct nlmsghdr *hdr)
35{
36	char *dev = NULL;
37	char *name = NULL;
38	char *link = NULL;
39	char *type = NULL;
40	int index = 0;
41	int err, len;
42	struct rtattr *data;
43	int group;
44	struct ifinfomsg *ifm, *peer_ifm;
45	unsigned int ifi_flags, ifi_change;
46
47	if (strcmp(argv[0], "peer") != 0) {
48		usage();
49		return -1;
50	}
51
52	ifm = NLMSG_DATA(hdr);
53	ifi_flags = ifm->ifi_flags;
54	ifi_change = ifm->ifi_change;
55	ifm->ifi_flags = 0;
56	ifm->ifi_change = 0;
57
58	data = NLMSG_TAIL(hdr);
59	addattr_l(hdr, 1024, VXCAN_INFO_PEER, NULL, 0);
60
61	hdr->nlmsg_len += sizeof(struct ifinfomsg);
62
63	err = iplink_parse(argc - 1, argv + 1, (struct iplink_req *)hdr,
64			   &name, &type, &link, &dev, &group, &index);
65	if (err < 0)
66		return err;
67
68	if (name) {
69		len = strlen(name) + 1;
70		if (len > IFNAMSIZ)
71			invarg("\"name\" too long\n", *argv);
72		addattr_l(hdr, 1024, IFLA_IFNAME, name, len);
73	}
74
75	peer_ifm = RTA_DATA(data);
76	peer_ifm->ifi_index = index;
77	peer_ifm->ifi_flags = ifm->ifi_flags;
78	peer_ifm->ifi_change = ifm->ifi_change;
79	ifm->ifi_flags = ifi_flags;
80	ifm->ifi_change = ifi_change;
81
82	if (group != -1)
83		addattr32(hdr, 1024, IFLA_GROUP, group);
84
85	data->rta_len = (void *)NLMSG_TAIL(hdr) - (void *)data;
86	return argc - 1 - err;
87}
88
89static void vxcan_print_help(struct link_util *lu, int argc, char **argv,
90	FILE *f)
91{
92	print_usage(f);
93}
94
95struct link_util vxcan_link_util = {
96	.id = "vxcan",
97	.parse_opt = vxcan_parse_opt,
98	.print_help = vxcan_print_help,
99};
100