ip/iplink_vxcan.c

   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
  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
  28 static void usage(void)
  29 {
  30         print_usage(stderr);
  31 }
  32
  33 static int vxcan_parse_opt(struct link_util *lu, int argc, char **argv,
  34                           struct nlmsghdr *n)
  35 {
  36         char *type = NULL;
  37         int err;
  38         struct rtattr *data;
  39         struct ifinfomsg *ifm, *peer_ifm;
  40         unsigned int ifi_flags, ifi_change, ifi_index;
  41
  42         if (strcmp(argv[0], "peer") != 0) {
  43                 usage();
  44                 return -1;
  45         }
  46
  47         ifm = NLMSG_DATA(n);
  48         ifi_flags = ifm->ifi_flags;
  49         ifi_change = ifm->ifi_change;
  50         ifi_index = ifm->ifi_index;
  51         ifm->ifi_flags = 0;
  52         ifm->ifi_change = 0;
  53         ifm->ifi_index = 0;
  54
  55         data = addattr_nest(n, 1024, VXCAN_INFO_PEER);
  56
  57         n->nlmsg_len += sizeof(struct ifinfomsg);
  58
  59         err = iplink_parse(argc - 1, argv + 1, (struct iplink_req *)n, &type);
  60         if (err < 0)
  61                 return err;
  62
  63         if (type)
  64                 duparg("type", argv[err]);
  65
  66         peer_ifm = RTA_DATA(data);
  67         peer_ifm->ifi_index = ifm->ifi_index;
  68         peer_ifm->ifi_flags = ifm->ifi_flags;
  69         peer_ifm->ifi_change = ifm->ifi_change;
  70         ifm->ifi_flags = ifi_flags;
  71         ifm->ifi_change = ifi_change;
  72         ifm->ifi_index = ifi_index;
  73
  74         addattr_nest_end(n, data);
  75         return argc - 1 - err;
  76 }
  77
  78 static void vxcan_print_help(struct link_util *lu, int argc, char **argv,
  79         FILE *f)
  80 {
  81         print_usage(f);
  82 }
  83
  84 struct link_util vxcan_link_util = {
  85         .id = "vxcan",
  86         .parse_opt = vxcan_parse_opt,
  87         .print_help = vxcan_print_help,
  88 };