ip/iplink_vlan.c

   1 /*
   2  * iplink_vlan.c        VLAN 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  */
  11
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <string.h>
  15 #include <linux/if_vlan.h>
  16
  17 #include "rt_names.h"
  18 #include "utils.h"
  19 #include "ip_common.h"
  20
  21 static void print_explain(FILE *f)
  22 {
  23         fprintf(f,
  24                 "Usage: ... vlan id VLANID\n"
  25                 "                [ protocol VLANPROTO ]\n"
  26                 "                [ reorder_hdr { on | off } ]\n"
  27                 "                [ gvrp { on | off } ]\n"
  28                 "                [ mvrp { on | off } ]\n"
  29                 "                [ loose_binding { on | off } ]\n"
  30                 "                [ ingress-qos-map QOS-MAP ]\n"
  31                 "                [ egress-qos-map QOS-MAP ]\n"
  32                 "\n"
  33                 "VLANID := 0-4095\n"
  34                 "VLANPROTO: [ 802.1Q / 802.1ad ]\n"
  35                 "QOS-MAP := [ QOS-MAP ] QOS-MAPPING\n"
  36                 "QOS-MAPPING := FROM:TO\n"
  37         );
  38 }
  39
  40 static void explain(void)
  41 {
  42         print_explain(stderr);
  43 }
  44
  45 static int on_off(const char *msg, const char *arg)
  46 {
  47         fprintf(stderr, "Error: argument of \"%s\" must be \"on\" or \"off\", not \"%s\"\n", msg, arg);
  48         return -1;
  49 }
  50
  51 static int vlan_parse_qos_map(int *argcp, char ***argvp, struct nlmsghdr *n,
  52                               int attrtype)
  53 {
  54         int argc = *argcp;
  55         char **argv = *argvp;
  56         struct ifla_vlan_qos_mapping m;
  57         struct rtattr *tail;
  58
  59         tail = NLMSG_TAIL(n);
  60         addattr_l(n, 1024, attrtype, NULL, 0);
  61
  62         while (argc > 0) {
  63                 char *colon = strchr(*argv, ':');
  64
  65                 if (!colon)
  66                         break;
  67                 *colon = '\0';
  68
  69                 if (get_u32(&m.from, *argv, 0))
  70                         return 1;
  71                 if (get_u32(&m.to, colon + 1, 0))
  72                         return 1;
  73                 argc--, argv++;
  74
  75                 addattr_l(n, 1024, IFLA_VLAN_QOS_MAPPING, &m, sizeof(m));
  76         }
  77
  78         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *)tail;
  79
  80         *argcp = argc;
  81         *argvp = argv;
  82         return 0;
  83 }
  84
  85 static int vlan_parse_opt(struct link_util *lu, int argc, char **argv,
  86                           struct nlmsghdr *n)
  87 {
  88         struct ifla_vlan_flags flags = { 0 };
  89         __u16 id, proto;
  90
  91         while (argc > 0) {
  92                 if (matches(*argv, "protocol") == 0) {
  93                         NEXT_ARG();
  94                         if (ll_proto_a2n(&proto, *argv))
  95                                 invarg("protocol is invalid", *argv);
  96                         addattr_l(n, 1024, IFLA_VLAN_PROTOCOL, &proto, 2);
  97                 } else if (matches(*argv, "id") == 0) {
  98                         NEXT_ARG();
  99                         if (get_u16(&id, *argv, 0))
 100                                 invarg("id is invalid", *argv);
 101                         addattr_l(n, 1024, IFLA_VLAN_ID, &id, 2);
 102                 } else if (matches(*argv, "reorder_hdr") == 0) {
 103                         NEXT_ARG();
 104                         flags.mask |= VLAN_FLAG_REORDER_HDR;
 105                         if (strcmp(*argv, "on") == 0)
 106                                 flags.flags |= VLAN_FLAG_REORDER_HDR;
 107                         else if (strcmp(*argv, "off") == 0)
 108                                 flags.flags &= ~VLAN_FLAG_REORDER_HDR;
 109                         else
 110                                 return on_off("reorder_hdr", *argv);
 111                 } else if (matches(*argv, "gvrp") == 0) {
 112                         NEXT_ARG();
 113                         flags.mask |= VLAN_FLAG_GVRP;
 114                         if (strcmp(*argv, "on") == 0)
 115                                 flags.flags |= VLAN_FLAG_GVRP;
 116                         else if (strcmp(*argv, "off") == 0)
 117                                 flags.flags &= ~VLAN_FLAG_GVRP;
 118                         else
 119                                 return on_off("gvrp", *argv);
 120                 } else if (matches(*argv, "mvrp") == 0) {
 121                         NEXT_ARG();
 122                         flags.mask |= VLAN_FLAG_MVRP;
 123                         if (strcmp(*argv, "on") == 0)
 124                                 flags.flags |= VLAN_FLAG_MVRP;
 125                         else if (strcmp(*argv, "off") == 0)
 126                                 flags.flags &= ~VLAN_FLAG_MVRP;
 127                         else
 128                                 return on_off("mvrp", *argv);
 129                 } else if (matches(*argv, "loose_binding") == 0) {
 130                         NEXT_ARG();
 131                         flags.mask |= VLAN_FLAG_LOOSE_BINDING;
 132                         if (strcmp(*argv, "on") == 0)
 133                                 flags.flags |= VLAN_FLAG_LOOSE_BINDING;
 134                         else if (strcmp(*argv, "off") == 0)
 135                                 flags.flags &= ~VLAN_FLAG_LOOSE_BINDING;
 136                         else
 137                                 return on_off("loose_binding", *argv);
 138                 } else if (matches(*argv, "ingress-qos-map") == 0) {
 139                         NEXT_ARG();
 140                         if (vlan_parse_qos_map(&argc, &argv, n,
 141                                                IFLA_VLAN_INGRESS_QOS))
 142                                 invarg("invalid ingress-qos-map", *argv);
 143                         continue;
 144                 } else if (matches(*argv, "egress-qos-map") == 0) {
 145                         NEXT_ARG();
 146                         if (vlan_parse_qos_map(&argc, &argv, n,
 147                                                IFLA_VLAN_EGRESS_QOS))
 148                                 invarg("invalid egress-qos-map", *argv);
 149                         continue;
 150                 } else if (matches(*argv, "help") == 0) {
 151                         explain();
 152                         return -1;
 153                 } else {
 154                         fprintf(stderr, "vlan: unknown command \"%s\"?\n", *argv);
 155                         explain();
 156                         return -1;
 157                 }
 158                 argc--, argv++;
 159         }
 160
 161         if (flags.mask)
 162                 addattr_l(n, 1024, IFLA_VLAN_FLAGS, &flags, sizeof(flags));
 163
 164         return 0;
 165 }
 166
 167 static void vlan_print_map(FILE *f,
 168                            const char *name_json,
 169                            const char *name_fp,
 170                            struct rtattr *attr)
 171 {
 172         struct ifla_vlan_qos_mapping *m;
 173         struct rtattr *i;
 174         int rem;
 175
 176         open_json_array(PRINT_JSON, name_json);
 177         print_string(PRINT_FP, NULL, "\n      %s { ", name_fp);
 178
 179         rem = RTA_PAYLOAD(attr);
 180         for (i = RTA_DATA(attr); RTA_OK(i, rem); i = RTA_NEXT(i, rem)) {
 181                 m = RTA_DATA(i);
 182
 183                 if (is_json_context()) {
 184                         open_json_object(NULL);
 185                         print_uint(PRINT_JSON, "from", NULL, m->from);
 186                         print_uint(PRINT_JSON, "to", NULL, m->to);
 187                         close_json_object();
 188                 } else {
 189                         fprintf(f, "%u:%u ", m->from, m->to);
 190                 }
 191         }
 192
 193         close_json_array(PRINT_JSON, NULL);
 194         print_string(PRINT_FP, NULL, "%s ", "}");
 195 }
 196
 197 static void vlan_print_flags(FILE *fp, __u32 flags)
 198 {
 199         open_json_array(PRINT_ANY, is_json_context() ? "flags" : "<");
 200 #define _PF(f)  if (flags & VLAN_FLAG_##f) {                            \
 201                 flags &= ~VLAN_FLAG_##f;                                \
 202                 print_string(PRINT_ANY, NULL, flags ? "%s," : "%s", #f); \
 203         }
 204         _PF(REORDER_HDR);
 205         _PF(GVRP);
 206         _PF(MVRP);
 207         _PF(LOOSE_BINDING);
 208 #undef _PF
 209         if (flags)
 210                 print_hex(PRINT_ANY, NULL, "%x", flags);
 211         close_json_array(PRINT_ANY, "> ");
 212 }
 213
 214 static void vlan_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 215 {
 216         struct ifla_vlan_flags *flags;
 217
 218         SPRINT_BUF(b1);
 219
 220         if (!tb)
 221                 return;
 222
 223         if (tb[IFLA_VLAN_PROTOCOL] &&
 224             RTA_PAYLOAD(tb[IFLA_VLAN_PROTOCOL]) < sizeof(__u16))
 225                 return;
 226         if (!tb[IFLA_VLAN_ID] ||
 227             RTA_PAYLOAD(tb[IFLA_VLAN_ID]) < sizeof(__u16))
 228                 return;
 229
 230         if (tb[IFLA_VLAN_PROTOCOL])
 231                 print_string(PRINT_ANY,
 232                              "protocol",
 233                              "protocol %s ",
 234                              ll_proto_n2a(
 235                                      rta_getattr_u16(tb[IFLA_VLAN_PROTOCOL]),
 236                                      b1, sizeof(b1)));
 237         else
 238                 print_string(PRINT_ANY, "protocol", "protocol %s ", "802.1q");
 239
 240         print_uint(PRINT_ANY,
 241                    "id",
 242                    "id %u ",
 243                    rta_getattr_u16(tb[IFLA_VLAN_ID]));
 244
 245         if (tb[IFLA_VLAN_FLAGS]) {
 246                 if (RTA_PAYLOAD(tb[IFLA_VLAN_FLAGS]) < sizeof(*flags))
 247                         return;
 248                 flags = RTA_DATA(tb[IFLA_VLAN_FLAGS]);
 249                 vlan_print_flags(f, flags->flags);
 250         }
 251         if (tb[IFLA_VLAN_INGRESS_QOS])
 252                 vlan_print_map(f,
 253                                "ingress_qos",
 254                                "ingress-qos-map",
 255                                tb[IFLA_VLAN_INGRESS_QOS]);
 256         if (tb[IFLA_VLAN_EGRESS_QOS])
 257                 vlan_print_map(f,
 258                                "egress_qos",
 259                                "egress-qos-map",
 260                                tb[IFLA_VLAN_EGRESS_QOS]);
 261 }
 262
 263 static void vlan_print_help(struct link_util *lu, int argc, char **argv,
 264                             FILE *f)
 265 {
 266         print_explain(f);
 267 }
 268
 269 struct link_util vlan_link_util = {
 270         .id             = "vlan",
 271         .maxattr        = IFLA_VLAN_MAX,
 272         .parse_opt      = vlan_parse_opt,
 273         .print_opt      = vlan_print_opt,
 274         .print_help     = vlan_print_help,
 275 };