ip/link_veth.c

   1 /*
   2  * link_veth.c  veth driver module
   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  * Authors:     Pavel Emelianov <xemul@openvz.org>
  10  *
  11  */
  12
  13 #include <string.h>
  14 #include <net/if.h>
  15 #include <linux/veth.h>
  16
  17 #include "utils.h"
  18 #include "ip_common.h"
  19
  20 static void usage(void)
  21 {
  22         printf("Usage: ip link <options> type veth "
  23                "[peer <options>]\nTo get <options> type "
  24                "'ip link add help'\n");
  25 }
  26
  27 static int veth_parse_opt(struct link_util *lu, int argc, char **argv,
  28                           struct nlmsghdr *hdr)
  29 {
  30         char *name, *type, *link, *dev;
  31         int err, len;
  32         struct rtattr * data;
  33
  34         if (strcmp(argv[0], "peer") != 0) {
  35                 usage();
  36                 return -1;
  37         }
  38
  39         data = NLMSG_TAIL(hdr);
  40         addattr_l(hdr, 1024, VETH_INFO_PEER, NULL, 0);
  41
  42         hdr->nlmsg_len += sizeof(struct ifinfomsg);
  43
  44         err = iplink_parse(argc - 1, argv + 1, (struct iplink_req *)hdr,
  45                            &name, &type, &link, &dev);
  46         if (err < 0)
  47                 return err;
  48
  49         if (name) {
  50                 len = strlen(name) + 1;
  51                 if (len > IFNAMSIZ)
  52                         invarg("\"name\" too long\n", *argv);
  53                 addattr_l(hdr, 1024, IFLA_IFNAME, name, len);
  54         }
  55
  56         data->rta_len = (void *)NLMSG_TAIL(hdr) - (void *)data;
  57         return argc - 1 - err;
  58 }
  59
  60 struct link_util veth_link_util = {
  61         .id = "veth",
  62         .parse_opt = veth_parse_opt,
  63 };