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