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 print_usage(FILE *f)
  21 {
  22         printf("Usage: ip link <options> type veth [peer <options>]\n"
  23                "To get <options> type 'ip link add help'\n");
  24 }
  25
  26 static void usage(void)
  27 {
  28         print_usage(stderr);
  29 }
  30
  31 static int veth_parse_opt(struct link_util *lu, int argc, char **argv,
  32                           struct nlmsghdr *n)
  33 {
  34         char *type = NULL;
  35         int err;
  36         struct rtattr *data;
  37         struct ifinfomsg *ifm, *peer_ifm;
  38         unsigned int ifi_flags, ifi_change, ifi_index;
  39
  40         if (strcmp(argv[0], "peer") != 0) {
  41                 usage();
  42                 return -1;
  43         }
  44
  45         ifm = NLMSG_DATA(n);
  46         ifi_flags = ifm->ifi_flags;
  47         ifi_change = ifm->ifi_change;
  48         ifi_index = ifm->ifi_index;
  49         ifm->ifi_flags = 0;
  50         ifm->ifi_change = 0;
  51         ifm->ifi_index = 0;
  52
  53         data = addattr_nest(n, 1024, VETH_INFO_PEER);
  54
  55         n->nlmsg_len += sizeof(struct ifinfomsg);
  56
  57         err = iplink_parse(argc - 1, argv + 1, (struct iplink_req *)n, &type);
  58         if (err < 0)
  59                 return err;
  60
  61         if (type)
  62                 duparg("type", argv[err]);
  63
  64         peer_ifm = RTA_DATA(data);
  65         peer_ifm->ifi_index = ifm->ifi_index;
  66         peer_ifm->ifi_flags = ifm->ifi_flags;
  67         peer_ifm->ifi_change = ifm->ifi_change;
  68         ifm->ifi_flags = ifi_flags;
  69         ifm->ifi_change = ifi_change;
  70         ifm->ifi_index = ifi_index;
  71
  72         addattr_nest_end(n, data);
  73         return argc - 1 - err;
  74 }
  75
  76 static void veth_print_help(struct link_util *lu, int argc, char **argv,
  77         FILE *f)
  78 {
  79         print_usage(f);
  80 }
  81
  82 struct link_util veth_link_util = {
  83         .id = "veth",
  84         .parse_opt = veth_parse_opt,
  85         .print_help = veth_print_help,
  86 };