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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  
print_usage(FILE * f)22  static 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  
usage(void)28  static void usage(void)
29  {
30  	print_usage(stderr);
31  }
32  
vxcan_parse_opt(struct link_util * lu,int argc,char ** argv,struct nlmsghdr * hdr)33  static 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  
vxcan_print_help(struct link_util * lu,int argc,char ** argv,FILE * f)89  static void vxcan_print_help(struct link_util *lu, int argc, char **argv,
90  	FILE *f)
91  {
92  	print_usage(f);
93  }
94  
95  struct link_util vxcan_link_util = {
96  	.id = "vxcan",
97  	.parse_opt = vxcan_parse_opt,
98  	.print_help = vxcan_print_help,
99  };
100