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 *dev = NULL;
  35         char *name = NULL;
  36         char *link = NULL;
  37         char *type = NULL;
  38         int index = 0;
  39         int err;
  40         struct rtattr *data;
  41         int group;
  42         struct ifinfomsg *ifm, *peer_ifm;
  43         unsigned int ifi_flags, ifi_change;
  44
  45         if (strcmp(argv[0], "peer") != 0) {
  46                 usage();
  47                 return -1;
  48         }
  49
  50         ifm = NLMSG_DATA(n);
  51         ifi_flags = ifm->ifi_flags;
  52         ifi_change = ifm->ifi_change;
  53         ifm->ifi_flags = 0;
  54         ifm->ifi_change = 0;
  55
  56         data = addattr_nest(n, 1024, VETH_INFO_PEER);
  57
  58         n->nlmsg_len += sizeof(struct ifinfomsg);
  59
  60         err = iplink_parse(argc - 1, argv + 1, (struct iplink_req *)n,
  61                            &name, &type, &link, &dev, &group, &index);
  62         if (err < 0)
  63                 return err;
  64
  65         if (type)
  66                 duparg("type", argv[err]);
  67
  68         if (name) {
  69                 addattr_l(n, 1024,
  70                           IFLA_IFNAME, name, strlen(name) + 1);
  71         }
  72
  73         peer_ifm = RTA_DATA(data);
  74         peer_ifm->ifi_index = index;
  75         peer_ifm->ifi_flags = ifm->ifi_flags;
  76         peer_ifm->ifi_change = ifm->ifi_change;
  77         ifm->ifi_flags = ifi_flags;
  78         ifm->ifi_change = ifi_change;
  79
  80         if (group != -1)
  81                 addattr32(n, 1024, IFLA_GROUP, group);
  82
  83         addattr_nest_end(n, data);
  84         return argc - 1 - err;
  85 }
  86
  87 static void veth_print_help(struct link_util *lu, int argc, char **argv,
  88         FILE *f)
  89 {
  90         print_usage(f);
  91 }
  92
  93 struct link_util veth_link_util = {
  94         .id = "veth",
  95         .parse_opt = veth_parse_opt,
  96         .print_help = veth_print_help,
  97 };