ip/iplink_ipvlan.c

   1 /* iplink_ipvlan.c      IPVLAN device support
   2  *
   3  *              This program is free software; you can redistribute it and/or
   4  *              modify it under the terms of the GNU General Public License
   5  *              as published by the Free Software Foundation; either version
   6  *              2 of the License, or (at your option) any later version.
   7  *
   8  * Authors:     Mahesh Bandewar <maheshb@google.com>
   9  */
  10
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <sys/socket.h>
  15 #include <linux/if_link.h>
  16
  17 #include "rt_names.h"
  18 #include "utils.h"
  19 #include "ip_common.h"
  20
  21 static void ipvlan_explain(FILE *f)
  22 {
  23         fprintf(f, "Usage: ... ipvlan [ mode { l2 | l3 } ]\n");
  24 }
  25
  26 static void explain(void)
  27 {
  28         ipvlan_explain(stderr);
  29 }
  30
  31 static int mode_arg(void)
  32 {
  33         fprintf(stderr, "Error: argument of \"mode\" must be either \"l2\", "
  34                 "or \"l3\"\n");
  35         return -1;
  36 }
  37
  38 static int ipvlan_parse_opt(struct link_util *lu, int argc, char **argv,
  39                             struct nlmsghdr *n)
  40 {
  41         while (argc > 0) {
  42                 if (matches(*argv, "mode") == 0) {
  43                         __u16 mode = 0;
  44                         NEXT_ARG();
  45
  46                         if (strcmp(*argv, "l2") == 0)
  47                                 mode = IPVLAN_MODE_L2;
  48                         else if (strcmp(*argv, "l3") == 0)
  49                                 mode = IPVLAN_MODE_L3;
  50                         else
  51                                 return mode_arg();
  52
  53                         addattr16(n, 1024, IFLA_IPVLAN_MODE, mode);
  54                 } else if (matches(*argv, "help") == 0) {
  55                         explain();
  56                         return -1;
  57                 } else {
  58                         fprintf(stderr, "ipvlan: unknown option \"%s\"?\n",
  59                                 *argv);
  60                         explain();
  61                         return -1;
  62                 }
  63                 argc--, argv++;
  64         }
  65
  66         return 0;
  67 }
  68
  69 static void ipvlan_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
  70 {
  71
  72         if (!tb)
  73                 return;
  74
  75         if (tb[IFLA_IPVLAN_MODE]) {
  76                 if (RTA_PAYLOAD(tb[IFLA_IPVLAN_MODE]) == sizeof(__u16)) {
  77                         __u16 mode = rta_getattr_u16(tb[IFLA_IPVLAN_MODE]);
  78
  79                         fprintf(f, " mode %s ",
  80                                 mode == IPVLAN_MODE_L2 ? "l2" :
  81                                 mode == IPVLAN_MODE_L3 ? "l3" : "unknown");
  82                 }
  83         }
  84 }
  85
  86 static void ipvlan_print_help(struct link_util *lu, int argc, char **argv,
  87                               FILE *f)
  88 {
  89         ipvlan_explain(f);
  90 }
  91
  92 struct link_util ipvlan_link_util = {
  93         .id             = "ipvlan",
  94         .maxattr        = IFLA_IPVLAN_MAX,
  95         .parse_opt      = ipvlan_parse_opt,
  96         .print_opt      = ipvlan_print_opt,
  97         .print_help     = ipvlan_print_help,
  98 };