ip/iplink_macvlan.c

   1 /*
   2  * iplink_macvlan.c     macvlan/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  * Authors:     Patrick McHardy <kaber@trash.net>
  10  *              Arnd Bergmann <arnd@arndb.de>
  11  */
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <sys/socket.h>
  17 #include <linux/if_link.h>
  18 #include <linux/if_ether.h>
  19
  20 #include "rt_names.h"
  21 #include "utils.h"
  22 #include "ip_common.h"
  23
  24 #define pfx_err(lu, ...) {               \
  25         fprintf(stderr, "%s: ", lu->id); \
  26         fprintf(stderr, __VA_ARGS__);    \
  27         fprintf(stderr, "\n");           \
  28 }
  29
  30 static void print_explain(struct link_util *lu, FILE *f)
  31 {
  32         fprintf(f,
  33                 "Usage: ... %s mode MODE [flag MODE_FLAG] MODE_OPTS\n"
  34                 "\n"
  35                 "MODE: private | vepa | bridge | passthru | source\n"
  36                 "MODE_FLAG: null | nopromisc\n"
  37                 "MODE_OPTS: for mode \"source\":\n"
  38                 "\tmacaddr { { add | del } <macaddr> | set [ <macaddr> [ <macaddr>  ... ] ] | flush }\n",
  39                 lu->id
  40         );
  41 }
  42
  43 static void explain(struct link_util *lu)
  44 {
  45         print_explain(lu, stderr);
  46 }
  47
  48
  49 static int mode_arg(const char *arg)
  50 {
  51         fprintf(stderr,
  52                 "Error: argument of \"mode\" must be \"private\", \"vepa\", \"bridge\", \"passthru\" or \"source\", not \"%s\"\n",
  53                 arg);
  54         return -1;
  55 }
  56
  57 static int flag_arg(const char *arg)
  58 {
  59         fprintf(stderr,
  60                 "Error: argument of \"flag\" must be \"nopromisc\" or \"null\", not \"%s\"\n",
  61                 arg);
  62         return -1;
  63 }
  64
  65 static int macvlan_parse_opt(struct link_util *lu, int argc, char **argv,
  66                           struct nlmsghdr *n)
  67 {
  68         __u32 mode = 0;
  69         __u16 flags = 0;
  70         __u32 mac_mode = 0;
  71         int has_flags = 0;
  72         char mac[ETH_ALEN];
  73         struct rtattr *nmac;
  74
  75         while (argc > 0) {
  76                 if (matches(*argv, "mode") == 0) {
  77                         NEXT_ARG();
  78
  79                         if (strcmp(*argv, "private") == 0)
  80                                 mode = MACVLAN_MODE_PRIVATE;
  81                         else if (strcmp(*argv, "vepa") == 0)
  82                                 mode = MACVLAN_MODE_VEPA;
  83                         else if (strcmp(*argv, "bridge") == 0)
  84                                 mode = MACVLAN_MODE_BRIDGE;
  85                         else if (strcmp(*argv, "passthru") == 0)
  86                                 mode = MACVLAN_MODE_PASSTHRU;
  87                         else if (strcmp(*argv, "source") == 0)
  88                                 mode = MACVLAN_MODE_SOURCE;
  89                         else
  90                                 return mode_arg(*argv);
  91                 } else if (matches(*argv, "flag") == 0) {
  92                         NEXT_ARG();
  93
  94                         if (strcmp(*argv, "nopromisc") == 0)
  95                                 flags |= MACVLAN_FLAG_NOPROMISC;
  96                         else if (strcmp(*argv, "null") == 0)
  97                                 flags |= 0;
  98                         else
  99                                 return flag_arg(*argv);
 100
 101                         has_flags = 1;
 102
 103                 } else if (matches(*argv, "macaddr") == 0) {
 104                         NEXT_ARG();
 105
 106                         if (strcmp(*argv, "add") == 0) {
 107                                 mac_mode = MACVLAN_MACADDR_ADD;
 108                         } else if (strcmp(*argv, "del") == 0) {
 109                                 mac_mode = MACVLAN_MACADDR_DEL;
 110                         } else if (strcmp(*argv, "set") == 0) {
 111                                 mac_mode = MACVLAN_MACADDR_SET;
 112                         } else if (strcmp(*argv, "flush") == 0) {
 113                                 mac_mode = MACVLAN_MACADDR_FLUSH;
 114                         } else {
 115                                 explain(lu);
 116                                 return -1;
 117                         }
 118
 119                         addattr32(n, 1024, IFLA_MACVLAN_MACADDR_MODE, mac_mode);
 120
 121                         if (mac_mode == MACVLAN_MACADDR_ADD ||
 122                             mac_mode == MACVLAN_MACADDR_DEL) {
 123                                 NEXT_ARG();
 124
 125                                 if (ll_addr_a2n(mac, sizeof(mac),
 126                                                 *argv) != ETH_ALEN)
 127                                         return -1;
 128
 129                                 addattr_l(n, 1024, IFLA_MACVLAN_MACADDR, &mac,
 130                                           ETH_ALEN);
 131                         }
 132
 133                         if (mac_mode == MACVLAN_MACADDR_SET) {
 134                                 nmac = addattr_nest(n, 1024,
 135                                                     IFLA_MACVLAN_MACADDR_DATA);
 136                                 while (NEXT_ARG_OK()) {
 137                                         NEXT_ARG_FWD();
 138
 139                                         if (ll_addr_a2n(mac, sizeof(mac),
 140                                                         *argv) != ETH_ALEN) {
 141                                                 PREV_ARG();
 142                                                 break;
 143                                         }
 144
 145                                         addattr_l(n, 1024, IFLA_MACVLAN_MACADDR,
 146                                                   &mac, ETH_ALEN);
 147                                 }
 148                                 addattr_nest_end(n, nmac);
 149                         }
 150                 } else if (matches(*argv, "nopromisc") == 0) {
 151                         flags |= MACVLAN_FLAG_NOPROMISC;
 152                         has_flags = 1;
 153                 } else if (matches(*argv, "help") == 0) {
 154                         explain(lu);
 155                         return -1;
 156                 } else {
 157                         pfx_err(lu, "unknown option \"%s\"?", *argv);
 158                         explain(lu);
 159                         return -1;
 160                 }
 161                 argc--, argv++;
 162         }
 163
 164         if (mode)
 165                 addattr32(n, 1024, IFLA_MACVLAN_MODE, mode);
 166
 167         if (has_flags) {
 168                 if (flags & MACVLAN_FLAG_NOPROMISC &&
 169                     mode != MACVLAN_MODE_PASSTHRU) {
 170                         pfx_err(lu, "nopromisc flag only valid in passthru mode");
 171                         explain(lu);
 172                         return -1;
 173                 }
 174                 addattr16(n, 1024, IFLA_MACVLAN_FLAGS, flags);
 175         }
 176         return 0;
 177 }
 178
 179 static void macvlan_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 180 {
 181         __u32 mode;
 182         __u16 flags;
 183         __u32 count;
 184         unsigned char *addr;
 185         int len;
 186         struct rtattr *rta;
 187
 188         if (!tb)
 189                 return;
 190
 191         if (!tb[IFLA_MACVLAN_MODE] ||
 192             RTA_PAYLOAD(tb[IFLA_MACVLAN_MODE]) < sizeof(__u32))
 193                 return;
 194
 195         mode = rta_getattr_u32(tb[IFLA_MACVLAN_MODE]);
 196         fprintf(f, "mode %s ",
 197                   mode == MACVLAN_MODE_PRIVATE ? "private"
 198                 : mode == MACVLAN_MODE_VEPA    ? "vepa"
 199                 : mode == MACVLAN_MODE_BRIDGE  ? "bridge"
 200                 : mode == MACVLAN_MODE_PASSTHRU  ? "passthru"
 201                 : mode == MACVLAN_MODE_SOURCE  ? "source"
 202                 :                                "unknown");
 203
 204         if (!tb[IFLA_MACVLAN_FLAGS] ||
 205             RTA_PAYLOAD(tb[IFLA_MACVLAN_FLAGS]) < sizeof(__u16))
 206                 flags = 0;
 207         else
 208                 flags = rta_getattr_u16(tb[IFLA_MACVLAN_FLAGS]);
 209
 210         if (flags & MACVLAN_FLAG_NOPROMISC)
 211                 fprintf(f, "nopromisc ");
 212
 213         /* in source mode, there are more options to print */
 214
 215         if (mode != MACVLAN_MODE_SOURCE)
 216                 return;
 217
 218         if (!tb[IFLA_MACVLAN_MACADDR_COUNT] ||
 219             RTA_PAYLOAD(tb[IFLA_MACVLAN_MACADDR_COUNT]) < sizeof(__u32))
 220                 return;
 221
 222         count = rta_getattr_u32(tb[IFLA_MACVLAN_MACADDR_COUNT]);
 223         fprintf(f, "remotes (%d) ", count);
 224
 225         if (!tb[IFLA_MACVLAN_MACADDR_DATA])
 226                 return;
 227
 228         rta = RTA_DATA(tb[IFLA_MACVLAN_MACADDR_DATA]);
 229         len = RTA_PAYLOAD(tb[IFLA_MACVLAN_MACADDR_DATA]);
 230
 231         for (; RTA_OK(rta, len); rta = RTA_NEXT(rta, len)) {
 232                 if (rta->rta_type != IFLA_MACVLAN_MACADDR ||
 233                     RTA_PAYLOAD(rta) < 6)
 234                         continue;
 235                 addr = RTA_DATA(rta);
 236                 fprintf(f, "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x ", addr[0],
 237                         addr[1], addr[2], addr[3], addr[4], addr[5]);
 238         }
 239 }
 240
 241 static void macvlan_print_help(struct link_util *lu, int argc, char **argv,
 242         FILE *f)
 243 {
 244         print_explain(lu, f);
 245 }
 246
 247 struct link_util macvlan_link_util = {
 248         .id             = "macvlan",
 249         .maxattr        = IFLA_MACVLAN_MAX,
 250         .parse_opt      = macvlan_parse_opt,
 251         .print_opt      = macvlan_print_opt,
 252         .print_help     = macvlan_print_help,
 253 };
 254
 255 struct link_util macvtap_link_util = {
 256         .id             = "macvtap",
 257         .maxattr        = IFLA_MACVLAN_MAX,
 258         .parse_opt      = macvlan_parse_opt,
 259         .print_opt      = macvlan_print_opt,
 260         .print_help     = macvlan_print_help,
 261 };