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 = addattr_nest(n, 1024, attrtype);
  60
  61         while (argc > 0) {
  62                 char *colon = strchr(*argv, ':');
  63
  64                 if (!colon)
  65                         break;
  66                 *colon = '\0';
  67
  68                 if (get_u32(&m.from, *argv, 0))
  69                         return 1;
  70                 if (get_u32(&m.to, colon + 1, 0))
  71                         return 1;
  72                 argc--, argv++;
  73
  74                 addattr_l(n, 1024, IFLA_VLAN_QOS_MAPPING, &m, sizeof(m));
  75         }
  76
  77         addattr_nest_end(n, tail);
  78
  79         *argcp = argc;
  80         *argvp = argv;
  81         return 0;
  82 }
  83
  84 static int vlan_parse_opt(struct link_util *lu, int argc, char **argv,
  85                           struct nlmsghdr *n)
  86 {
  87         struct ifla_vlan_flags flags = { 0 };
  88         __u16 id, proto;
  89
  90         while (argc > 0) {
  91                 if (matches(*argv, "protocol") == 0) {
  92                         NEXT_ARG();
  93                         if (ll_proto_a2n(&proto, *argv))
  94                                 invarg("protocol is invalid", *argv);
  95                         addattr_l(n, 1024, IFLA_VLAN_PROTOCOL, &proto, 2);
  96                 } else if (matches(*argv, "id") == 0) {
  97                         NEXT_ARG();
  98                         if (get_u16(&id, *argv, 0))
  99                                 invarg("id is invalid", *argv);
 100                         addattr_l(n, 1024, IFLA_VLAN_ID, &id, 2);
 101                 } else if (matches(*argv, "reorder_hdr") == 0) {
 102                         NEXT_ARG();
 103                         flags.mask |= VLAN_FLAG_REORDER_HDR;
 104                         if (strcmp(*argv, "on") == 0)
 105                                 flags.flags |= VLAN_FLAG_REORDER_HDR;
 106                         else if (strcmp(*argv, "off") == 0)
 107                                 flags.flags &= ~VLAN_FLAG_REORDER_HDR;
 108                         else
 109                                 return on_off("reorder_hdr", *argv);
 110                 } else if (matches(*argv, "gvrp") == 0) {
 111                         NEXT_ARG();
 112                         flags.mask |= VLAN_FLAG_GVRP;
 113                         if (strcmp(*argv, "on") == 0)
 114                                 flags.flags |= VLAN_FLAG_GVRP;
 115                         else if (strcmp(*argv, "off") == 0)
 116                                 flags.flags &= ~VLAN_FLAG_GVRP;
 117                         else
 118                                 return on_off("gvrp", *argv);
 119                 } else if (matches(*argv, "mvrp") == 0) {
 120                         NEXT_ARG();
 121                         flags.mask |= VLAN_FLAG_MVRP;
 122                         if (strcmp(*argv, "on") == 0)
 123                                 flags.flags |= VLAN_FLAG_MVRP;
 124                         else if (strcmp(*argv, "off") == 0)
 125                                 flags.flags &= ~VLAN_FLAG_MVRP;
 126                         else
 127                                 return on_off("mvrp", *argv);
 128                 } else if (matches(*argv, "loose_binding") == 0) {
 129                         NEXT_ARG();
 130                         flags.mask |= VLAN_FLAG_LOOSE_BINDING;
 131                         if (strcmp(*argv, "on") == 0)
 132                                 flags.flags |= VLAN_FLAG_LOOSE_BINDING;
 133                         else if (strcmp(*argv, "off") == 0)
 134                                 flags.flags &= ~VLAN_FLAG_LOOSE_BINDING;
 135                         else
 136                                 return on_off("loose_binding", *argv);
 137                 } else if (matches(*argv, "ingress-qos-map") == 0) {
 138                         NEXT_ARG();
 139                         if (vlan_parse_qos_map(&argc, &argv, n,
 140                                                IFLA_VLAN_INGRESS_QOS))
 141                                 invarg("invalid ingress-qos-map", *argv);
 142                         continue;
 143                 } else if (matches(*argv, "egress-qos-map") == 0) {
 144                         NEXT_ARG();
 145                         if (vlan_parse_qos_map(&argc, &argv, n,
 146                                                IFLA_VLAN_EGRESS_QOS))
 147                                 invarg("invalid egress-qos-map", *argv);
 148                         continue;
 149                 } else if (matches(*argv, "help") == 0) {
 150                         explain();
 151                         return -1;
 152                 } else {
 153                         fprintf(stderr, "vlan: unknown command \"%s\"?\n", *argv);
 154                         explain();
 155                         return -1;
 156                 }
 157                 argc--, argv++;
 158         }
 159
 160         if (flags.mask)
 161                 addattr_l(n, 1024, IFLA_VLAN_FLAGS, &flags, sizeof(flags));
 162
 163         return 0;
 164 }
 165
 166 static void vlan_print_map(FILE *f,
 167                            const char *name_json,
 168                            const char *name_fp,
 169                            struct rtattr *attr)
 170 {
 171         struct ifla_vlan_qos_mapping *m;
 172         struct rtattr *i;
 173         int rem;
 174
 175         open_json_array(PRINT_JSON, name_json);
 176         print_string(PRINT_FP, NULL, "\n      %s { ", name_fp);
 177
 178         rem = RTA_PAYLOAD(attr);
 179         for (i = RTA_DATA(attr); RTA_OK(i, rem); i = RTA_NEXT(i, rem)) {
 180                 m = RTA_DATA(i);
 181
 182                 if (is_json_context()) {
 183                         open_json_object(NULL);
 184                         print_uint(PRINT_JSON, "from", NULL, m->from);
 185                         print_uint(PRINT_JSON, "to", NULL, m->to);
 186                         close_json_object();
 187                 } else {
 188                         fprintf(f, "%u:%u ", m->from, m->to);
 189                 }
 190         }
 191
 192         close_json_array(PRINT_JSON, NULL);
 193         print_string(PRINT_FP, NULL, "%s ", "}");
 194 }
 195
 196 static void vlan_print_flags(FILE *fp, __u32 flags)
 197 {
 198         open_json_array(PRINT_ANY, is_json_context() ? "flags" : "<");
 199 #define _PF(f)  if (flags & VLAN_FLAG_##f) {                            \
 200                 flags &= ~VLAN_FLAG_##f;                                \
 201                 print_string(PRINT_ANY, NULL, flags ? "%s," : "%s", #f); \
 202         }
 203         _PF(REORDER_HDR);
 204         _PF(GVRP);
 205         _PF(MVRP);
 206         _PF(LOOSE_BINDING);
 207 #undef _PF
 208         if (flags)
 209                 print_hex(PRINT_ANY, NULL, "%x", flags);
 210         close_json_array(PRINT_ANY, "> ");
 211 }
 212
 213 static void vlan_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 214 {
 215         struct ifla_vlan_flags *flags;
 216
 217         SPRINT_BUF(b1);
 218
 219         if (!tb)
 220                 return;
 221
 222         if (tb[IFLA_VLAN_PROTOCOL] &&
 223             RTA_PAYLOAD(tb[IFLA_VLAN_PROTOCOL]) < sizeof(__u16))
 224                 return;
 225         if (!tb[IFLA_VLAN_ID] ||
 226             RTA_PAYLOAD(tb[IFLA_VLAN_ID]) < sizeof(__u16))
 227                 return;
 228
 229         if (tb[IFLA_VLAN_PROTOCOL])
 230                 print_string(PRINT_ANY,
 231                              "protocol",
 232                              "protocol %s ",
 233                              ll_proto_n2a(
 234                                      rta_getattr_u16(tb[IFLA_VLAN_PROTOCOL]),
 235                                      b1, sizeof(b1)));
 236         else
 237                 print_string(PRINT_ANY, "protocol", "protocol %s ", "802.1q");
 238
 239         print_uint(PRINT_ANY,
 240                    "id",
 241                    "id %u ",
 242                    rta_getattr_u16(tb[IFLA_VLAN_ID]));
 243
 244         if (tb[IFLA_VLAN_FLAGS]) {
 245                 if (RTA_PAYLOAD(tb[IFLA_VLAN_FLAGS]) < sizeof(*flags))
 246                         return;
 247                 flags = RTA_DATA(tb[IFLA_VLAN_FLAGS]);
 248                 vlan_print_flags(f, flags->flags);
 249         }
 250         if (tb[IFLA_VLAN_INGRESS_QOS])
 251                 vlan_print_map(f,
 252                                "ingress_qos",
 253                                "ingress-qos-map",
 254                                tb[IFLA_VLAN_INGRESS_QOS]);
 255         if (tb[IFLA_VLAN_EGRESS_QOS])
 256                 vlan_print_map(f,
 257                                "egress_qos",
 258                                "egress-qos-map",
 259                                tb[IFLA_VLAN_EGRESS_QOS]);
 260 }
 261
 262 static void vlan_print_help(struct link_util *lu, int argc, char **argv,
 263                             FILE *f)
 264 {
 265         print_explain(f);
 266 }
 267
 268 struct link_util vlan_link_util = {
 269         .id             = "vlan",
 270         .maxattr        = IFLA_VLAN_MAX,
 271         .parse_opt      = vlan_parse_opt,
 272         .print_opt      = vlan_print_opt,
 273         .print_help     = vlan_print_help,
 274 };