ip/iplink_macvtap.c

   1 /*
   2  * iplink_macvtap.c     macvtap device support
   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
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <sys/socket.h>
  14 #include <linux/if_link.h>
  15
  16 #include "rt_names.h"
  17 #include "utils.h"
  18 #include "ip_common.h"
  19
  20 static void explain(void)
  21 {
  22         fprintf(stderr,
  23                 "Usage: ... macvtap mode { private | vepa | bridge | passthru }\n"
  24         );
  25 }
  26
  27 static int mode_arg(void)
  28 {
  29         fprintf(stderr, "Error: argument of \"mode\" must be \"private\", "
  30                 "\"vepa\", \"bridge\" or \"passthru\" \n");
  31         return -1;
  32 }
  33
  34 static int macvtap_parse_opt(struct link_util *lu, int argc, char **argv,
  35                           struct nlmsghdr *n)
  36 {
  37         while (argc > 0) {
  38                 if (matches(*argv, "mode") == 0) {
  39                         __u32 mode = 0;
  40                         NEXT_ARG();
  41
  42                         if (strcmp(*argv, "private") == 0)
  43                                 mode = MACVLAN_MODE_PRIVATE;
  44                         else if (strcmp(*argv, "vepa") == 0)
  45                                 mode = MACVLAN_MODE_VEPA;
  46                         else if (strcmp(*argv, "bridge") == 0)
  47                                 mode = MACVLAN_MODE_BRIDGE;
  48                         else if (strcmp(*argv, "passthru") == 0)
  49                                 mode = MACVLAN_MODE_PASSTHRU;
  50                         else
  51                                 return mode_arg();
  52
  53                         addattr32(n, 1024, IFLA_MACVLAN_MODE, mode);
  54                 } else if (matches(*argv, "help") == 0) {
  55                         explain();
  56                         return -1;
  57                 } else {
  58                         fprintf(stderr, "macvtap: what is \"%s\"?\n", *argv);
  59                         explain();
  60                         return -1;
  61                 }
  62                 argc--, argv++;
  63         }
  64
  65         return 0;
  66 }
  67
  68 static void macvtap_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
  69 {
  70         __u32 mode;
  71
  72         if (!tb)
  73                 return;
  74
  75         if (!tb[IFLA_MACVLAN_MODE] ||
  76             RTA_PAYLOAD(tb[IFLA_MACVLAN_MODE]) < sizeof(__u32))
  77                 return;
  78
  79         mode = rta_getattr_u32(tb[IFLA_VLAN_ID]);
  80         fprintf(f, " mode %s ",
  81                   mode == MACVLAN_MODE_PRIVATE ? "private"
  82                 : mode == MACVLAN_MODE_VEPA    ? "vepa"
  83                 : mode == MACVLAN_MODE_BRIDGE  ? "bridge"
  84                 : mode == MACVLAN_MODE_PASSTHRU  ? "passthru"
  85                 :                                "unknown");
  86 }
  87
  88 struct link_util macvtap_link_util = {
  89         .id             = "macvtap",
  90         .maxattr        = IFLA_MACVLAN_MAX,
  91         .parse_opt      = macvtap_parse_opt,
  92         .print_opt      = macvtap_print_opt,
  93 };