LXR iproute2/ip/link

   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
  20static 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
  26static void usage(void)
  27{
  28        print_usage(stderr);
  29}
  30
  31static 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
  76static void veth_print_help(struct link_util *lu, int argc, char **argv,
  77        FILE *f)
  78{
  79        print_usage(f);
  80}
  81
  82struct link_util veth_link_util = {
  83        .id = "veth",
  84        .parse_opt = veth_parse_opt,
  85        .print_help = veth_print_help,
  86};
  87