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