bridge/fdb.c

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Get/set/delete fdb table with netlink
   4  *
   5  * TODO: merge/replace this with ip neighbour
   6  *
   7  * Authors:     Stephen Hemminger <shemminger@vyatta.com>
   8  */
   9
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <unistd.h>
  13 #include <netdb.h>
  14 #include <time.h>
  15 #include <fcntl.h>
  16 #include <sys/socket.h>
  17 #include <sys/time.h>
  18 #include <net/if.h>
  19 #include <netinet/in.h>
  20 #include <linux/if_bridge.h>
  21 #include <linux/if_ether.h>
  22 #include <linux/neighbour.h>
  23 #include <string.h>
  24 #include <limits.h>
  25 #include <stdbool.h>
  26
  27 #include "json_print.h"
  28 #include "libnetlink.h"
  29 #include "br_common.h"
  30 #include "rt_names.h"
  31 #include "utils.h"
  32
  33 static unsigned int filter_index, filter_dynamic, filter_master,
  34         filter_state, filter_vlan;
  35
  36 static void usage(void)
  37 {
  38         fprintf(stderr,
  39                 "Usage: bridge fdb { add | append | del | replace } ADDR dev DEV\n"
  40                 "              [ self ] [ master ] [ use ] [ router ] [ extern_learn ]\n"
  41                 "              [ sticky ] [ local | static | dynamic ] [ vlan VID ]\n"
  42                 "              { [ dst IPADDR ] [ port PORT] [ vni VNI ] | [ nhid NHID ] }\n"
  43                 "              [ via DEV ] [ src_vni VNI ]\n"
  44                 "       bridge fdb [ show [ br BRDEV ] [ brport DEV ] [ vlan VID ]\n"
  45                 "              [ state STATE ] [ dynamic ] ]\n"
  46                 "       bridge fdb get [ to ] LLADDR [ br BRDEV ] { brport | dev } DEV\n"
  47                 "              [ vlan VID ] [ vni VNI ] [ self ] [ master ] [ dynamic ]\n");
  48         exit(-1);
  49 }
  50
  51 static const char *state_n2a(unsigned int s)
  52 {
  53         static char buf[32];
  54
  55         if (s & NUD_PERMANENT)
  56                 return "permanent";
  57
  58         if (s & NUD_NOARP)
  59                 return "static";
  60
  61         if (s & NUD_STALE)
  62                 return "stale";
  63
  64         if (s & NUD_REACHABLE)
  65                 return "";
  66
  67         if (is_json_context())
  68                 sprintf(buf, "%#x", s);
  69         else
  70                 sprintf(buf, "state=%#x", s);
  71         return buf;
  72 }
  73
  74 static int state_a2n(unsigned int *s, const char *arg)
  75 {
  76         if (matches(arg, "permanent") == 0)
  77                 *s = NUD_PERMANENT;
  78         else if (matches(arg, "static") == 0 || matches(arg, "temp") == 0)
  79                 *s = NUD_NOARP;
  80         else if (matches(arg, "stale") == 0)
  81                 *s = NUD_STALE;
  82         else if (matches(arg, "reachable") == 0 || matches(arg, "dynamic") == 0)
  83                 *s = NUD_REACHABLE;
  84         else if (strcmp(arg, "all") == 0)
  85                 *s = ~0;
  86         else if (get_unsigned(s, arg, 0))
  87                 return -1;
  88
  89         return 0;
  90 }
  91
  92 static void fdb_print_flags(FILE *fp, unsigned int flags)
  93 {
  94         open_json_array(PRINT_JSON,
  95                         is_json_context() ?  "flags" : "");
  96
  97         if (flags & NTF_SELF)
  98                 print_string(PRINT_ANY, NULL, "%s ", "self");
  99
 100         if (flags & NTF_ROUTER)
 101                 print_string(PRINT_ANY, NULL, "%s ", "router");
 102
 103         if (flags & NTF_EXT_LEARNED)
 104                 print_string(PRINT_ANY, NULL, "%s ", "extern_learn");
 105
 106         if (flags & NTF_OFFLOADED)
 107                 print_string(PRINT_ANY, NULL, "%s ", "offload");
 108
 109         if (flags & NTF_MASTER)
 110                 print_string(PRINT_ANY, NULL, "%s ", "master");
 111
 112         if (flags & NTF_STICKY)
 113                 print_string(PRINT_ANY, NULL, "%s ", "sticky");
 114
 115         close_json_array(PRINT_JSON, NULL);
 116 }
 117
 118 static void fdb_print_stats(FILE *fp, const struct nda_cacheinfo *ci)
 119 {
 120         static int hz;
 121
 122         if (!hz)
 123                 hz = get_user_hz();
 124
 125         if (is_json_context()) {
 126                 print_uint(PRINT_JSON, "used", NULL,
 127                                  ci->ndm_used / hz);
 128                 print_uint(PRINT_JSON, "updated", NULL,
 129                                 ci->ndm_updated / hz);
 130         } else {
 131                 fprintf(fp, "used %d/%d ", ci->ndm_used / hz,
 132                                         ci->ndm_updated / hz);
 133
 134         }
 135 }
 136
 137 int print_fdb(struct nlmsghdr *n, void *arg)
 138 {
 139         FILE *fp = arg;
 140         struct ndmsg *r = NLMSG_DATA(n);
 141         int len = n->nlmsg_len;
 142         struct rtattr *tb[NDA_MAX+1];
 143         __u16 vid = 0;
 144
 145         if (n->nlmsg_type != RTM_NEWNEIGH && n->nlmsg_type != RTM_DELNEIGH) {
 146                 fprintf(stderr, "Not RTM_NEWNEIGH: %08x %08x %08x\n",
 147                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
 148                 return 0;
 149         }
 150
 151         len -= NLMSG_LENGTH(sizeof(*r));
 152         if (len < 0) {
 153                 fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
 154                 return -1;
 155         }
 156
 157         if (r->ndm_family != AF_BRIDGE)
 158                 return 0;
 159
 160         if (filter_index && filter_index != r->ndm_ifindex)
 161                 return 0;
 162
 163         if (filter_state && !(r->ndm_state & filter_state))
 164                 return 0;
 165
 166         parse_rtattr(tb, NDA_MAX, NDA_RTA(r),
 167                      n->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
 168
 169         if (tb[NDA_VLAN])
 170                 vid = rta_getattr_u16(tb[NDA_VLAN]);
 171
 172         if (filter_vlan && filter_vlan != vid)
 173                 return 0;
 174
 175         if (filter_dynamic && (r->ndm_state & NUD_PERMANENT))
 176                 return 0;
 177
 178         open_json_object(NULL);
 179         if (n->nlmsg_type == RTM_DELNEIGH)
 180                 print_bool(PRINT_ANY, "deleted", "Deleted ", true);
 181
 182         if (tb[NDA_LLADDR]) {
 183                 const char *lladdr;
 184                 SPRINT_BUF(b1);
 185
 186                 lladdr = ll_addr_n2a(RTA_DATA(tb[NDA_LLADDR]),
 187                                      RTA_PAYLOAD(tb[NDA_LLADDR]),
 188                                      ll_index_to_type(r->ndm_ifindex),
 189                                      b1, sizeof(b1));
 190
 191                 print_color_string(PRINT_ANY, COLOR_MAC,
 192                                    "mac", "%s ", lladdr);
 193         }
 194
 195         if (!filter_index && r->ndm_ifindex)
 196                 print_color_string(PRINT_ANY, COLOR_IFNAME,
 197                                    "ifname", "dev %s ",
 198                                    ll_index_to_name(r->ndm_ifindex));
 199
 200         if (tb[NDA_DST]) {
 201                 int family = AF_INET;
 202                 const char *dst;
 203
 204                 if (RTA_PAYLOAD(tb[NDA_DST]) == sizeof(struct in6_addr))
 205                         family = AF_INET6;
 206
 207                 dst = format_host(family,
 208                                   RTA_PAYLOAD(tb[NDA_DST]),
 209                                   RTA_DATA(tb[NDA_DST]));
 210
 211                 print_color_string(PRINT_ANY,
 212                                    ifa_family_color(family),
 213                                     "dst", "dst %s ", dst);
 214         }
 215
 216         if (vid)
 217                 print_uint(PRINT_ANY,
 218                                  "vlan", "vlan %hu ", vid);
 219
 220         if (tb[NDA_PORT])
 221                 print_uint(PRINT_ANY,
 222                                  "port", "port %u ",
 223                                  rta_getattr_be16(tb[NDA_PORT]));
 224
 225         if (tb[NDA_VNI])
 226                 print_uint(PRINT_ANY,
 227                                  "vni", "vni %u ",
 228                                  rta_getattr_u32(tb[NDA_VNI]));
 229
 230         if (tb[NDA_SRC_VNI])
 231                 print_uint(PRINT_ANY,
 232                                  "src_vni", "src_vni %u ",
 233                                 rta_getattr_u32(tb[NDA_SRC_VNI]));
 234
 235         if (tb[NDA_IFINDEX]) {
 236                 unsigned int ifindex = rta_getattr_u32(tb[NDA_IFINDEX]);
 237
 238                 if (tb[NDA_LINK_NETNSID])
 239                         print_uint(PRINT_ANY,
 240                                          "viaIfIndex", "via ifindex %u ",
 241                                          ifindex);
 242                 else
 243                         print_string(PRINT_ANY,
 244                                            "viaIf", "via %s ",
 245                                            ll_index_to_name(ifindex));
 246         }
 247
 248         if (tb[NDA_NH_ID])
 249                 print_uint(PRINT_ANY, "nhid", "nhid %u ",
 250                            rta_getattr_u32(tb[NDA_NH_ID]));
 251
 252         if (tb[NDA_LINK_NETNSID])
 253                 print_uint(PRINT_ANY,
 254                                  "linkNetNsId", "link-netnsid %d ",
 255                                  rta_getattr_u32(tb[NDA_LINK_NETNSID]));
 256
 257         if (show_stats && tb[NDA_CACHEINFO])
 258                 fdb_print_stats(fp, RTA_DATA(tb[NDA_CACHEINFO]));
 259
 260         fdb_print_flags(fp, r->ndm_flags);
 261
 262
 263         if (tb[NDA_MASTER])
 264                 print_string(PRINT_ANY, "master", "master %s ",
 265                              ll_index_to_name(rta_getattr_u32(tb[NDA_MASTER])));
 266
 267         print_string(PRINT_ANY, "state", "%s\n",
 268                            state_n2a(r->ndm_state));
 269         close_json_object();
 270         fflush(fp);
 271         return 0;
 272 }
 273
 274 static int fdb_linkdump_filter(struct nlmsghdr *nlh, int reqlen)
 275 {
 276         int err;
 277
 278         if (filter_index) {
 279                 struct ifinfomsg *ifm = NLMSG_DATA(nlh);
 280
 281                 ifm->ifi_index = filter_index;
 282         }
 283
 284         if (filter_master) {
 285                 err = addattr32(nlh, reqlen, IFLA_MASTER, filter_master);
 286                 if (err)
 287                         return err;
 288         }
 289
 290         return 0;
 291 }
 292
 293 static int fdb_dump_filter(struct nlmsghdr *nlh, int reqlen)
 294 {
 295         int err;
 296
 297         if (filter_index) {
 298                 struct ndmsg *ndm = NLMSG_DATA(nlh);
 299
 300                 ndm->ndm_ifindex = filter_index;
 301         }
 302
 303         if (filter_master) {
 304                 err = addattr32(nlh, reqlen, NDA_MASTER, filter_master);
 305                 if (err)
 306                         return err;
 307         }
 308
 309         return 0;
 310 }
 311
 312 static int fdb_show(int argc, char **argv)
 313 {
 314         char *filter_dev = NULL;
 315         char *br = NULL;
 316         int rc;
 317
 318         while (argc > 0) {
 319                 if ((strcmp(*argv, "brport") == 0) || strcmp(*argv, "dev") == 0) {
 320                         NEXT_ARG();
 321                         filter_dev = *argv;
 322                 } else if (strcmp(*argv, "br") == 0) {
 323                         NEXT_ARG();
 324                         br = *argv;
 325                 } else if (strcmp(*argv, "vlan") == 0) {
 326                         NEXT_ARG();
 327                         if (filter_vlan)
 328                                 duparg("vlan", *argv);
 329                         filter_vlan = atoi(*argv);
 330                 } else if (strcmp(*argv, "state") == 0) {
 331                         unsigned int state;
 332
 333                         NEXT_ARG();
 334                         if (state_a2n(&state, *argv))
 335                                 invarg("invalid state", *argv);
 336                         filter_state |= state;
 337                 } else if (strcmp(*argv, "dynamic") == 0) {
 338                         filter_dynamic = 1;
 339                 } else {
 340                         if (matches(*argv, "help") == 0)
 341                                 usage();
 342                 }
 343                 argc--; argv++;
 344         }
 345
 346         if (br) {
 347                 int br_ifindex = ll_name_to_index(br);
 348
 349                 if (br_ifindex == 0) {
 350                         fprintf(stderr, "Cannot find bridge device \"%s\"\n", br);
 351                         return -1;
 352                 }
 353                 filter_master = br_ifindex;
 354         }
 355
 356         /*we'll keep around filter_dev for older kernels */
 357         if (filter_dev) {
 358                 filter_index = ll_name_to_index(filter_dev);
 359                 if (!filter_index)
 360                         return nodev(filter_dev);
 361         }
 362
 363         if (rth.flags & RTNL_HANDLE_F_STRICT_CHK)
 364                 rc = rtnl_neighdump_req(&rth, PF_BRIDGE, fdb_dump_filter);
 365         else
 366                 rc = rtnl_fdb_linkdump_req_filter_fn(&rth, fdb_linkdump_filter);
 367         if (rc < 0) {
 368                 perror("Cannot send dump request");
 369                 exit(1);
 370         }
 371
 372         new_json_obj(json);
 373         if (rtnl_dump_filter(&rth, print_fdb, stdout) < 0) {
 374                 fprintf(stderr, "Dump terminated\n");
 375                 exit(1);
 376         }
 377         delete_json_obj();
 378         fflush(stdout);
 379
 380         return 0;
 381 }
 382
 383 static int fdb_modify(int cmd, int flags, int argc, char **argv)
 384 {
 385         struct {
 386                 struct nlmsghdr n;
 387                 struct ndmsg            ndm;
 388                 char                    buf[256];
 389         } req = {
 390                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg)),
 391                 .n.nlmsg_flags = NLM_F_REQUEST | flags,
 392                 .n.nlmsg_type = cmd,
 393                 .ndm.ndm_family = PF_BRIDGE,
 394                 .ndm.ndm_state = NUD_NOARP,
 395         };
 396         char *addr = NULL;
 397         char *d = NULL;
 398         char abuf[ETH_ALEN];
 399         int dst_ok = 0;
 400         inet_prefix dst;
 401         unsigned long port = 0;
 402         unsigned long vni = ~0;
 403         unsigned long src_vni = ~0;
 404         unsigned int via = 0;
 405         char *endptr;
 406         short vid = -1;
 407         __u32 nhid = 0;
 408
 409         while (argc > 0) {
 410                 if (strcmp(*argv, "dev") == 0) {
 411                         NEXT_ARG();
 412                         d = *argv;
 413                 } else if (strcmp(*argv, "dst") == 0) {
 414                         NEXT_ARG();
 415                         if (dst_ok)
 416                                 duparg2("dst", *argv);
 417                         get_addr(&dst, *argv, preferred_family);
 418                         dst_ok = 1;
 419                 } else if (strcmp(*argv, "nhid") == 0) {
 420                         NEXT_ARG();
 421                         if (get_u32(&nhid, *argv, 0))
 422                                 invarg("\"id\" value is invalid\n", *argv);
 423                 } else if (strcmp(*argv, "port") == 0) {
 424
 425                         NEXT_ARG();
 426                         port = strtoul(*argv, &endptr, 0);
 427                         if (endptr && *endptr) {
 428                                 struct servent *pse;
 429
 430                                 pse = getservbyname(*argv, "udp");
 431                                 if (!pse)
 432                                         invarg("invalid port\n", *argv);
 433                                 port = ntohs(pse->s_port);
 434                         } else if (port > 0xffff)
 435                                 invarg("invalid port\n", *argv);
 436                 } else if (strcmp(*argv, "vni") == 0) {
 437                         NEXT_ARG();
 438                         vni = strtoul(*argv, &endptr, 0);
 439                         if ((endptr && *endptr) ||
 440                             (vni >> 24) || vni == ULONG_MAX)
 441                                 invarg("invalid VNI\n", *argv);
 442                 } else if (strcmp(*argv, "src_vni") == 0) {
 443                         NEXT_ARG();
 444                         src_vni = strtoul(*argv, &endptr, 0);
 445                         if ((endptr && *endptr) ||
 446                             (src_vni >> 24) || src_vni == ULONG_MAX)
 447                                 invarg("invalid src VNI\n", *argv);
 448                 } else if (strcmp(*argv, "via") == 0) {
 449                         NEXT_ARG();
 450                         via = ll_name_to_index(*argv);
 451                         if (!via)
 452                                 exit(nodev(*argv));
 453                 } else if (strcmp(*argv, "self") == 0) {
 454                         req.ndm.ndm_flags |= NTF_SELF;
 455                 } else if (matches(*argv, "master") == 0) {
 456                         req.ndm.ndm_flags |= NTF_MASTER;
 457                 } else if (matches(*argv, "router") == 0) {
 458                         req.ndm.ndm_flags |= NTF_ROUTER;
 459                 } else if (matches(*argv, "local") == 0 ||
 460                            matches(*argv, "permanent") == 0) {
 461                         req.ndm.ndm_state |= NUD_PERMANENT;
 462                 } else if (matches(*argv, "temp") == 0 ||
 463                            matches(*argv, "static") == 0) {
 464                         req.ndm.ndm_state |= NUD_REACHABLE;
 465                 } else if (matches(*argv, "dynamic") == 0) {
 466                         req.ndm.ndm_state |= NUD_REACHABLE;
 467                         req.ndm.ndm_state &= ~NUD_NOARP;
 468                 } else if (matches(*argv, "vlan") == 0) {
 469                         if (vid >= 0)
 470                                 duparg2("vlan", *argv);
 471                         NEXT_ARG();
 472                         vid = atoi(*argv);
 473                 } else if (matches(*argv, "use") == 0) {
 474                         req.ndm.ndm_flags |= NTF_USE;
 475                 } else if (matches(*argv, "extern_learn") == 0) {
 476                         req.ndm.ndm_flags |= NTF_EXT_LEARNED;
 477                 } else if (matches(*argv, "sticky") == 0) {
 478                         req.ndm.ndm_flags |= NTF_STICKY;
 479                 } else {
 480                         if (strcmp(*argv, "to") == 0)
 481                                 NEXT_ARG();
 482
 483                         if (matches(*argv, "help") == 0)
 484                                 usage();
 485                         if (addr)
 486                                 duparg2("to", *argv);
 487                         addr = *argv;
 488                 }
 489                 argc--; argv++;
 490         }
 491
 492         if (d == NULL || addr == NULL) {
 493                 fprintf(stderr, "Device and address are required arguments.\n");
 494                 return -1;
 495         }
 496
 497         if (nhid && (dst_ok || port || vni != ~0)) {
 498                 fprintf(stderr, "dst, port, vni are mutually exclusive with nhid\n");
 499                 return -1;
 500         }
 501
 502         /* Assume self */
 503         if (!(req.ndm.ndm_flags&(NTF_SELF|NTF_MASTER)))
 504                 req.ndm.ndm_flags |= NTF_SELF;
 505
 506         /* Assume permanent */
 507         if (!(req.ndm.ndm_state&(NUD_PERMANENT|NUD_REACHABLE)))
 508                 req.ndm.ndm_state |= NUD_PERMANENT;
 509
 510         if (sscanf(addr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
 511                    abuf, abuf+1, abuf+2,
 512                    abuf+3, abuf+4, abuf+5) != 6) {
 513                 fprintf(stderr, "Invalid mac address %s\n", addr);
 514                 return -1;
 515         }
 516
 517         addattr_l(&req.n, sizeof(req), NDA_LLADDR, abuf, ETH_ALEN);
 518         if (dst_ok)
 519                 addattr_l(&req.n, sizeof(req), NDA_DST, &dst.data, dst.bytelen);
 520
 521         if (vid >= 0)
 522                 addattr16(&req.n, sizeof(req), NDA_VLAN, vid);
 523         if (nhid > 0)
 524                 addattr32(&req.n, sizeof(req), NDA_NH_ID, nhid);
 525
 526         if (port) {
 527                 unsigned short dport;
 528
 529                 dport = htons((unsigned short)port);
 530                 addattr16(&req.n, sizeof(req), NDA_PORT, dport);
 531         }
 532         if (vni != ~0)
 533                 addattr32(&req.n, sizeof(req), NDA_VNI, vni);
 534         if (src_vni != ~0)
 535                 addattr32(&req.n, sizeof(req), NDA_SRC_VNI, src_vni);
 536         if (via)
 537                 addattr32(&req.n, sizeof(req), NDA_IFINDEX, via);
 538
 539         req.ndm.ndm_ifindex = ll_name_to_index(d);
 540         if (!req.ndm.ndm_ifindex)
 541                 return nodev(d);
 542
 543         if (rtnl_talk(&rth, &req.n, NULL) < 0)
 544                 return -1;
 545
 546         return 0;
 547 }
 548
 549 static int fdb_get(int argc, char **argv)
 550 {
 551         struct {
 552                 struct nlmsghdr n;
 553                 struct ndmsg            ndm;
 554                 char                    buf[1024];
 555         } req = {
 556                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg)),
 557                 .n.nlmsg_flags = NLM_F_REQUEST,
 558                 .n.nlmsg_type = RTM_GETNEIGH,
 559                 .ndm.ndm_family = AF_BRIDGE,
 560         };
 561         char  *d = NULL, *br = NULL;
 562         struct nlmsghdr *answer;
 563         unsigned long vni = ~0;
 564         char abuf[ETH_ALEN];
 565         int br_ifindex = 0;
 566         char *addr = NULL;
 567         short vlan = -1;
 568         char *endptr;
 569
 570         while (argc > 0) {
 571                 if ((strcmp(*argv, "brport") == 0) || strcmp(*argv, "dev") == 0) {
 572                         NEXT_ARG();
 573                         d = *argv;
 574                 } else if (strcmp(*argv, "br") == 0) {
 575                         NEXT_ARG();
 576                         br = *argv;
 577                 } else if (strcmp(*argv, "dev") == 0) {
 578                         NEXT_ARG();
 579                         d = *argv;
 580                 } else if (strcmp(*argv, "vni") == 0) {
 581                         NEXT_ARG();
 582                         vni = strtoul(*argv, &endptr, 0);
 583                         if ((endptr && *endptr) ||
 584                             (vni >> 24) || vni == ULONG_MAX)
 585                                 invarg("invalid VNI\n", *argv);
 586                 } else if (strcmp(*argv, "self") == 0) {
 587                         req.ndm.ndm_flags |= NTF_SELF;
 588                 } else if (matches(*argv, "master") == 0) {
 589                         req.ndm.ndm_flags |= NTF_MASTER;
 590                 } else if (matches(*argv, "vlan") == 0) {
 591                         if (vlan >= 0)
 592                                 duparg2("vlan", *argv);
 593                         NEXT_ARG();
 594                         vlan = atoi(*argv);
 595                 } else if (matches(*argv, "dynamic") == 0) {
 596                         filter_dynamic = 1;
 597                 } else {
 598                         if (strcmp(*argv, "to") == 0)
 599                                 NEXT_ARG();
 600
 601                         if (matches(*argv, "help") == 0)
 602                                 usage();
 603                         if (addr)
 604                                 duparg2("to", *argv);
 605                         addr = *argv;
 606                 }
 607                 argc--; argv++;
 608         }
 609
 610         if ((d == NULL && br == NULL) || addr == NULL) {
 611                 fprintf(stderr, "Device or master and address are required arguments.\n");
 612                 return -1;
 613         }
 614
 615         if (sscanf(addr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
 616                    abuf, abuf+1, abuf+2,
 617                    abuf+3, abuf+4, abuf+5) != 6) {
 618                 fprintf(stderr, "Invalid mac address %s\n", addr);
 619                 return -1;
 620         }
 621
 622         addattr_l(&req.n, sizeof(req), NDA_LLADDR, abuf, ETH_ALEN);
 623
 624         if (vlan >= 0)
 625                 addattr16(&req.n, sizeof(req), NDA_VLAN, vlan);
 626
 627         if (vni != ~0)
 628                 addattr32(&req.n, sizeof(req), NDA_VNI, vni);
 629
 630         if (d) {
 631                 req.ndm.ndm_ifindex = ll_name_to_index(d);
 632                 if (!req.ndm.ndm_ifindex) {
 633                         fprintf(stderr, "Cannot find device \"%s\"\n", d);
 634                         return -1;
 635                 }
 636         }
 637
 638         if (br) {
 639                 br_ifindex = ll_name_to_index(br);
 640                 if (!br_ifindex) {
 641                         fprintf(stderr, "Cannot find bridge device \"%s\"\n", br);
 642                         return -1;
 643                 }
 644                 addattr32(&req.n, sizeof(req), NDA_MASTER, br_ifindex);
 645         }
 646
 647         if (rtnl_talk(&rth, &req.n, &answer) < 0)
 648                 return -2;
 649
 650         /*
 651          * Initialize a json_writer and open an array object
 652          * if -json was specified.
 653          */
 654         new_json_obj(json);
 655         if (print_fdb(answer, stdout) < 0) {
 656                 fprintf(stderr, "An error :-)\n");
 657                 return -1;
 658         }
 659         delete_json_obj();
 660
 661         return 0;
 662 }
 663
 664 int do_fdb(int argc, char **argv)
 665 {
 666         ll_init_map(&rth);
 667
 668         if (argc > 0) {
 669                 if (matches(*argv, "add") == 0)
 670                         return fdb_modify(RTM_NEWNEIGH, NLM_F_CREATE|NLM_F_EXCL, argc-1, argv+1);
 671                 if (matches(*argv, "append") == 0)
 672                         return fdb_modify(RTM_NEWNEIGH, NLM_F_CREATE|NLM_F_APPEND, argc-1, argv+1);
 673                 if (matches(*argv, "replace") == 0)
 674                         return fdb_modify(RTM_NEWNEIGH, NLM_F_CREATE|NLM_F_REPLACE, argc-1, argv+1);
 675                 if (matches(*argv, "delete") == 0)
 676                         return fdb_modify(RTM_DELNEIGH, 0, argc-1, argv+1);
 677                 if (matches(*argv, "get") == 0)
 678                         return fdb_get(argc-1, argv+1);
 679                 if (matches(*argv, "show") == 0 ||
 680                     matches(*argv, "lst") == 0 ||
 681                     matches(*argv, "list") == 0)
 682                         return fdb_show(argc-1, argv+1);
 683                 if (matches(*argv, "help") == 0)
 684                         usage();
 685         } else
 686                 return fdb_show(0, NULL);
 687
 688         fprintf(stderr, "Command \"%s\" is unknown, try \"bridge fdb help\".\n", *argv);
 689         exit(-1);
 690 }