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 id VLANID [ FLAG-LIST ]\n"
  25                 "                          [ ingress-qos-map QOS-MAP ] [ egress-qos-map QOS-MAP ]\n"
  26                 "\n"
  27                 "VLANID := 0-4095\n"
  28                 "FLAG-LIST := [ FLAG-LIST ] FLAG\n"
  29                 "FLAG := [ reorder_hdr { on | off } ] [ gvrp { on | off } ]\n"
  30                 "        [ loose_binding { on | off } ]\n"
  31                 "QOS-MAP := [ QOS-MAP ] QOS-MAPPING\n"
  32                 "QOS-MAPPING := FROM:TO\n"
  33         );
  34 }
  35
  36 static int on_off(char *msg)
  37 {
  38         fprintf(stderr, "Error: argument of \"%s\" must be \"on\" or \"off\"\n", msg);
  39         return -1;
  40 }
  41
  42 static int vlan_parse_qos_map(int *argcp, char ***argvp, struct nlmsghdr *n,
  43                               int attrtype)
  44 {
  45         int argc = *argcp;
  46         char **argv = *argvp;
  47         struct ifla_vlan_qos_mapping m;
  48         struct rtattr *tail;
  49
  50         tail = NLMSG_TAIL(n);
  51         addattr_l(n, 1024, attrtype, NULL, 0);
  52
  53         while (argc > 0) {
  54                 char *colon = strchr(*argv, ':');
  55
  56                 if (!colon)
  57                         break;
  58                 *colon = '\0';
  59
  60                 if (get_u32(&m.from, *argv, 0))
  61                         return 1;
  62                 if (get_u32(&m.to, colon + 1, 0))
  63                         return 1;
  64                 argc--, argv++;
  65
  66                 addattr_l(n, 1024, IFLA_VLAN_QOS_MAPPING, &m, sizeof(m));
  67         }
  68
  69         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *)tail;
  70
  71         *argcp = argc;
  72         *argvp = argv;
  73         return 0;
  74 }
  75
  76 static int vlan_parse_opt(struct link_util *lu, int argc, char **argv,
  77                           struct nlmsghdr *n)
  78 {
  79         struct ifla_vlan_flags flags = { 0 };
  80         __u16 id;
  81
  82         while (argc > 0) {
  83                 if (matches(*argv, "id") == 0) {
  84                         NEXT_ARG();
  85                         if (get_u16(&id, *argv, 0))
  86                                 invarg("id is invalid", *argv);
  87                         addattr_l(n, 1024, IFLA_VLAN_ID, &id, 2);
  88                 } else if (matches(*argv, "reorder_hdr") == 0) {
  89                         NEXT_ARG();
  90                         flags.mask |= VLAN_FLAG_REORDER_HDR;
  91                         if (strcmp(*argv, "on") == 0)
  92                                 flags.flags |= VLAN_FLAG_REORDER_HDR;
  93                         else if (strcmp(*argv, "off") == 0)
  94                                 flags.flags &= ~VLAN_FLAG_REORDER_HDR;
  95                         else
  96                                 return on_off("reorder_hdr");
  97                 } else if (matches(*argv, "gvrp") == 0) {
  98                         NEXT_ARG();
  99                         flags.mask |= VLAN_FLAG_GVRP;
 100                         if (strcmp(*argv, "on") == 0)
 101                                 flags.flags |= VLAN_FLAG_GVRP;
 102                         else if (strcmp(*argv, "off") == 0)
 103                                 flags.flags &= ~VLAN_FLAG_GVRP;
 104                         else
 105                                 return on_off("gvrp");
 106                 } else if (matches(*argv, "loose_binding") == 0) {
 107                         NEXT_ARG();
 108                         flags.mask |= VLAN_FLAG_LOOSE_BINDING;
 109                         if (strcmp(*argv, "on") == 0)
 110                                 flags.flags |= VLAN_FLAG_LOOSE_BINDING;
 111                         else if (strcmp(*argv, "off") == 0)
 112                                 flags.flags &= ~VLAN_FLAG_LOOSE_BINDING;
 113                         else
 114                                 return on_off("loose_binding");
 115                 } else if (matches(*argv, "ingress-qos-map") == 0) {
 116                         NEXT_ARG();
 117                         if (vlan_parse_qos_map(&argc, &argv, n,
 118                                                IFLA_VLAN_INGRESS_QOS))
 119                                 invarg("invalid ingress-qos-map", *argv);
 120                         continue;
 121                 } else if (matches(*argv, "egress-qos-map") == 0) {
 122                         NEXT_ARG();
 123                         if (vlan_parse_qos_map(&argc, &argv, n,
 124                                                IFLA_VLAN_EGRESS_QOS))
 125                                 invarg("invalid egress-qos-map", *argv);
 126                         continue;
 127                 } else if (matches(*argv, "help") == 0) {
 128                         explain();
 129                         return -1;
 130                 } else {
 131                         fprintf(stderr, "vlan: what is \"%s\"?\n", *argv);
 132                         explain();
 133                         return -1;
 134                 }
 135                 argc--, argv++;
 136         }
 137
 138         if (flags.mask)
 139                 addattr_l(n, 1024, IFLA_VLAN_FLAGS, &flags, sizeof(flags));
 140
 141         return 0;
 142 }
 143
 144 static void vlan_print_map(FILE *f, char *name, struct rtattr *attr)
 145 {
 146         struct ifla_vlan_qos_mapping *m;
 147         struct rtattr *i;
 148         int rem;
 149
 150         fprintf(f, "\n      %s { ", name);
 151
 152         rem = RTA_PAYLOAD(attr);
 153         for (i = RTA_DATA(attr); RTA_OK(i, rem); i = RTA_NEXT(i, rem)) {
 154                 m = RTA_DATA(i);
 155                 fprintf(f, "%u:%u ", m->from, m->to);
 156         }
 157         fprintf(f, "} ");
 158 }
 159
 160 static void vlan_print_flags(FILE *fp, __u32 flags)
 161 {
 162         fprintf(fp, "<");
 163 #define _PF(f)  if (flags & VLAN_FLAG_##f) { \
 164                         flags &= ~ VLAN_FLAG_##f; \
 165                         fprintf(fp, #f "%s", flags ? "," : ""); \
 166                 }
 167         _PF(REORDER_HDR);
 168         _PF(GVRP);
 169         _PF(LOOSE_BINDING);
 170 #undef _PF
 171         if (flags)
 172                 fprintf(fp, "%x", flags);
 173         fprintf(fp, "> ");
 174 }
 175
 176 static void vlan_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 177 {
 178         struct ifla_vlan_flags *flags;
 179         if (!tb)
 180                 return;
 181
 182         if (!tb[IFLA_VLAN_ID] ||
 183             RTA_PAYLOAD(tb[IFLA_VLAN_ID]) < sizeof(__u16))
 184                 return;
 185
 186         fprintf(f, "id %u ", *(__u16 *)RTA_DATA(tb[IFLA_VLAN_ID]));
 187
 188         if (tb[IFLA_VLAN_FLAGS]) {
 189                 if (RTA_PAYLOAD(tb[IFLA_VLAN_FLAGS]) < sizeof(*flags))
 190                         return;
 191                 flags = RTA_DATA(tb[IFLA_VLAN_FLAGS]);
 192                 vlan_print_flags(f, flags->flags);
 193         }
 194         if (tb[IFLA_VLAN_INGRESS_QOS])
 195                 vlan_print_map(f, "ingress-qos-map", tb[IFLA_VLAN_INGRESS_QOS]);
 196         if (tb[IFLA_VLAN_EGRESS_QOS])
 197                 vlan_print_map(f, "egress-qos-map", tb[IFLA_VLAN_EGRESS_QOS]);
 198 }
 199
 200 struct link_util vlan_link_util = {
 201         .id             = "vlan",
 202         .maxattr        = IFLA_VLAN_MAX,
 203         .parse_opt      = vlan_parse_opt,
 204         .print_opt      = vlan_print_opt,
 205 };