bridge/fdb.c

   1 /*
   2  * Get/set/delete fdb table with netlink
   3  *
   4  * TODO: merge/replace this with ip neighbour
   5  *
   6  * Authors:     Stephen Hemminger <shemminger@vyatta.com>
   7  */
   8
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <unistd.h>
  12 #include <netdb.h>
  13 #include <time.h>
  14 #include <fcntl.h>
  15 #include <sys/socket.h>
  16 #include <sys/time.h>
  17 #include <net/if.h>
  18 #include <netinet/in.h>
  19 #include <linux/if_bridge.h>
  20 #include <linux/if_ether.h>
  21 #include <linux/neighbour.h>
  22 #include <string.h>
  23 #include <limits.h>
  24 #include <json_writer.h>
  25 #include <stdbool.h>
  26
  27 #include "libnetlink.h"
  28 #include "br_common.h"
  29 #include "rt_names.h"
  30 #include "utils.h"
  31
  32 static unsigned int filter_index, filter_vlan;
  33
  34 json_writer_t *jw_global;
  35
  36 static void usage(void)
  37 {
  38         fprintf(stderr, "Usage: bridge fdb { add | append | del | replace } ADDR dev DEV\n"
  39                         "              [ self ] [ master ] [ use ] [ router ]\n"
  40                         "              [ local | static | dynamic ] [ dst IPADDR ] [ vlan VID ]\n"
  41                         "              [ port PORT] [ vni VNI ] [ via DEV ]\n");
  42         fprintf(stderr, "       bridge fdb [ show [ br BRDEV ] [ brport DEV ] [ vlan VID ] ]\n");
  43         exit(-1);
  44 }
  45
  46 static const char *state_n2a(unsigned int s)
  47 {
  48         static char buf[32];
  49
  50         if (s & NUD_PERMANENT)
  51                 return "permanent";
  52
  53         if (s & NUD_NOARP)
  54                 return "static";
  55
  56         if (s & NUD_STALE)
  57                 return "stale";
  58
  59         if (s & NUD_REACHABLE)
  60                 return "";
  61
  62         sprintf(buf, "state=%#x", s);
  63         return buf;
  64 }
  65
  66 static void start_json_fdb_flags_array(bool *fdb_flags)
  67 {
  68         if (*fdb_flags)
  69                 return;
  70         jsonw_name(jw_global, "flags");
  71         jsonw_start_array(jw_global);
  72         *fdb_flags = true;
  73 }
  74
  75 int print_fdb(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
  76 {
  77         FILE *fp = arg;
  78         struct ndmsg *r = NLMSG_DATA(n);
  79         int len = n->nlmsg_len;
  80         struct rtattr *tb[NDA_MAX+1];
  81         __u16 vid = 0;
  82         bool fdb_flags = false;
  83         const char *state_s;
  84
  85         if (n->nlmsg_type != RTM_NEWNEIGH && n->nlmsg_type != RTM_DELNEIGH) {
  86                 fprintf(stderr, "Not RTM_NEWNEIGH: %08x %08x %08x\n",
  87                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
  88                 return 0;
  89         }
  90
  91         len -= NLMSG_LENGTH(sizeof(*r));
  92         if (len < 0) {
  93                 fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
  94                 return -1;
  95         }
  96
  97         if (r->ndm_family != AF_BRIDGE)
  98                 return 0;
  99
 100         if (filter_index && filter_index != r->ndm_ifindex)
 101                 return 0;
 102
 103         parse_rtattr(tb, NDA_MAX, NDA_RTA(r),
 104                      n->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
 105
 106         if (tb[NDA_VLAN])
 107                 vid = rta_getattr_u16(tb[NDA_VLAN]);
 108
 109         if (filter_vlan && filter_vlan != vid)
 110                 return 0;
 111
 112         if (jw_global) {
 113                 jsonw_pretty(jw_global, 1);
 114                 jsonw_start_object(jw_global);
 115         }
 116
 117         if (n->nlmsg_type == RTM_DELNEIGH) {
 118                 if (jw_global)
 119                         jsonw_string_field(jw_global, "opCode", "deleted");
 120                 else
 121                         fprintf(fp, "Deleted ");
 122         }
 123
 124         if (tb[NDA_LLADDR]) {
 125                 SPRINT_BUF(b1);
 126                 ll_addr_n2a(RTA_DATA(tb[NDA_LLADDR]),
 127                             RTA_PAYLOAD(tb[NDA_LLADDR]),
 128                             ll_index_to_type(r->ndm_ifindex),
 129                             b1, sizeof(b1));
 130                 if (jw_global)
 131                         jsonw_string_field(jw_global, "mac", b1);
 132                 else
 133                         fprintf(fp, "%s ", b1);
 134         }
 135
 136         if (!filter_index && r->ndm_ifindex) {
 137                 if (jw_global)
 138                         jsonw_string_field(jw_global, "dev",
 139                                            ll_index_to_name(r->ndm_ifindex));
 140                 else
 141                         fprintf(fp, "dev %s ",
 142                                 ll_index_to_name(r->ndm_ifindex));
 143         }
 144
 145         if (tb[NDA_DST]) {
 146                 int family = AF_INET;
 147                 const char *abuf_s;
 148
 149                 if (RTA_PAYLOAD(tb[NDA_DST]) == sizeof(struct in6_addr))
 150                         family = AF_INET6;
 151
 152                 abuf_s = format_host(family,
 153                                      RTA_PAYLOAD(tb[NDA_DST]),
 154                                      RTA_DATA(tb[NDA_DST]));
 155                 if (jw_global)
 156                         jsonw_string_field(jw_global, "dst", abuf_s);
 157                 else
 158                         fprintf(fp, "dst %s ", abuf_s);
 159         }
 160
 161         if (vid) {
 162                 if (jw_global)
 163                         jsonw_uint_field(jw_global, "vlan", vid);
 164                 else
 165                         fprintf(fp, "vlan %hu ", vid);
 166         }
 167
 168         if (tb[NDA_PORT]) {
 169                 if (jw_global)
 170                         jsonw_uint_field(jw_global, "port",
 171                                          rta_getattr_be16(tb[NDA_PORT]));
 172                 else
 173                         fprintf(fp, "port %d ",
 174                                 rta_getattr_be16(tb[NDA_PORT]));
 175         }
 176
 177         if (tb[NDA_VNI]) {
 178                 if (jw_global)
 179                         jsonw_uint_field(jw_global, "vni",
 180                                          rta_getattr_u32(tb[NDA_VNI]));
 181                 else
 182                         fprintf(fp, "vni %d ",
 183                                 rta_getattr_u32(tb[NDA_VNI]));
 184         }
 185
 186         if (tb[NDA_IFINDEX]) {
 187                 unsigned int ifindex = rta_getattr_u32(tb[NDA_IFINDEX]);
 188
 189                 if (ifindex) {
 190                         char ifname[IF_NAMESIZE];
 191
 192                         if (!tb[NDA_LINK_NETNSID] &&
 193                             if_indextoname(ifindex, ifname)) {
 194                                 if (jw_global)
 195                                         jsonw_string_field(jw_global, "viaIf",
 196                                                            ifname);
 197                                 else
 198                                         fprintf(fp, "via %s ", ifname);
 199                         } else {
 200                                 if (jw_global)
 201                                         jsonw_uint_field(jw_global, "viaIfIndex",
 202                                                          ifindex);
 203                                 else
 204                                         fprintf(fp, "via ifindex %u ", ifindex);
 205                         }
 206                 }
 207         }
 208
 209         if (tb[NDA_LINK_NETNSID]) {
 210                 if (jw_global)
 211                         jsonw_uint_field(jw_global, "linkNetNsId",
 212                                          rta_getattr_u32(tb[NDA_LINK_NETNSID]));
 213                 else
 214                         fprintf(fp, "link-netnsid %d ",
 215                                 rta_getattr_u32(tb[NDA_LINK_NETNSID]));
 216         }
 217
 218         if (show_stats && tb[NDA_CACHEINFO]) {
 219                 struct nda_cacheinfo *ci = RTA_DATA(tb[NDA_CACHEINFO]);
 220                 int hz = get_user_hz();
 221
 222                 if (jw_global) {
 223                         jsonw_uint_field(jw_global, "used",
 224                                 ci->ndm_used/hz);
 225                         jsonw_uint_field(jw_global, "updated",
 226                                 ci->ndm_updated/hz);
 227                 } else {
 228                         fprintf(fp, "used %d/%d ", ci->ndm_used/hz,
 229                                         ci->ndm_updated/hz);
 230                 }
 231         }
 232
 233         if (jw_global) {
 234                 if (r->ndm_flags & NTF_SELF) {
 235                         start_json_fdb_flags_array(&fdb_flags);
 236                         jsonw_string(jw_global, "self");
 237                 }
 238                 if (r->ndm_flags & NTF_ROUTER) {
 239                         start_json_fdb_flags_array(&fdb_flags);
 240                         jsonw_string(jw_global, "router");
 241                 }
 242                 if (r->ndm_flags & NTF_EXT_LEARNED) {
 243                         start_json_fdb_flags_array(&fdb_flags);
 244                         jsonw_string(jw_global, "offload");
 245                 }
 246                 if (r->ndm_flags & NTF_MASTER)
 247                         jsonw_string(jw_global, "master");
 248                 if (fdb_flags)
 249                         jsonw_end_array(jw_global);
 250
 251                 if (tb[NDA_MASTER])
 252                         jsonw_string_field(jw_global,
 253                                            "master",
 254                                            ll_index_to_name(rta_getattr_u32(tb[NDA_MASTER])));
 255
 256         } else {
 257                 if (r->ndm_flags & NTF_SELF)
 258                         fprintf(fp, "self ");
 259                 if (r->ndm_flags & NTF_ROUTER)
 260                         fprintf(fp, "router ");
 261                 if (r->ndm_flags & NTF_EXT_LEARNED)
 262                         fprintf(fp, "offload ");
 263                 if (tb[NDA_MASTER]) {
 264                         fprintf(fp, "master %s ",
 265                                 ll_index_to_name(rta_getattr_u32(tb[NDA_MASTER])));
 266                 } else if (r->ndm_flags & NTF_MASTER) {
 267                         fprintf(fp, "master ");
 268                 }
 269         }
 270
 271         state_s = state_n2a(r->ndm_state);
 272         if (jw_global) {
 273                 if (state_s[0])
 274                         jsonw_string_field(jw_global, "state", state_s);
 275
 276                 jsonw_end_object(jw_global);
 277         } else {
 278                 fprintf(fp, "%s\n", state_s);
 279
 280                 fflush(fp);
 281         }
 282
 283         return 0;
 284 }
 285
 286 static int fdb_show(int argc, char **argv)
 287 {
 288         struct {
 289                 struct nlmsghdr n;
 290                 struct ifinfomsg        ifm;
 291                 char                    buf[256];
 292         } req = {
 293                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
 294                 .ifm.ifi_family = PF_BRIDGE,
 295         };
 296
 297         char *filter_dev = NULL;
 298         char *br = NULL;
 299         int msg_size = sizeof(struct ifinfomsg);
 300
 301         while (argc > 0) {
 302                 if ((strcmp(*argv, "brport") == 0) || strcmp(*argv, "dev") == 0) {
 303                         NEXT_ARG();
 304                         filter_dev = *argv;
 305                 } else if (strcmp(*argv, "br") == 0) {
 306                         NEXT_ARG();
 307                         br = *argv;
 308                 } else if (strcmp(*argv, "vlan") == 0) {
 309                         NEXT_ARG();
 310                         if (filter_vlan)
 311                                 duparg("vlan", *argv);
 312                         filter_vlan = atoi(*argv);
 313                 } else {
 314                         if (matches(*argv, "help") == 0)
 315                                 usage();
 316                 }
 317                 argc--; argv++;
 318         }
 319
 320         if (br) {
 321                 int br_ifindex = ll_name_to_index(br);
 322
 323                 if (br_ifindex == 0) {
 324                         fprintf(stderr, "Cannot find bridge device \"%s\"\n", br);
 325                         return -1;
 326                 }
 327                 addattr32(&req.n, sizeof(req), IFLA_MASTER, br_ifindex);
 328                 msg_size += RTA_LENGTH(4);
 329         }
 330
 331         /*we'll keep around filter_dev for older kernels */
 332         if (filter_dev) {
 333                 filter_index = if_nametoindex(filter_dev);
 334                 if (filter_index == 0) {
 335                         fprintf(stderr, "Cannot find device \"%s\"\n",
 336                                 filter_dev);
 337                         return -1;
 338                 }
 339                 req.ifm.ifi_index = filter_index;
 340         }
 341
 342         if (rtnl_dump_request(&rth, RTM_GETNEIGH, &req.ifm, msg_size) < 0) {
 343                 perror("Cannot send dump request");
 344                 exit(1);
 345         }
 346
 347         if (json_output) {
 348                 jw_global = jsonw_new(stdout);
 349                 if (!jw_global) {
 350                         fprintf(stderr, "Error allocation json object\n");
 351                         exit(1);
 352                 }
 353                 jsonw_start_array(jw_global);
 354         }
 355         if (rtnl_dump_filter(&rth, print_fdb, stdout) < 0) {
 356                 fprintf(stderr, "Dump terminated\n");
 357                 exit(1);
 358         }
 359         if (jw_global) {
 360                 jsonw_end_array(jw_global);
 361                 jsonw_destroy(&jw_global);
 362         }
 363
 364         return 0;
 365 }
 366
 367 static int fdb_modify(int cmd, int flags, int argc, char **argv)
 368 {
 369         struct {
 370                 struct nlmsghdr n;
 371                 struct ndmsg            ndm;
 372                 char                    buf[256];
 373         } req = {
 374                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg)),
 375                 .n.nlmsg_flags = NLM_F_REQUEST | flags,
 376                 .n.nlmsg_type = cmd,
 377                 .ndm.ndm_family = PF_BRIDGE,
 378                 .ndm.ndm_state = NUD_NOARP,
 379         };
 380         char *addr = NULL;
 381         char *d = NULL;
 382         char abuf[ETH_ALEN];
 383         int dst_ok = 0;
 384         inet_prefix dst;
 385         unsigned long port = 0;
 386         unsigned long vni = ~0;
 387         unsigned int via = 0;
 388         char *endptr;
 389         short vid = -1;
 390
 391         while (argc > 0) {
 392                 if (strcmp(*argv, "dev") == 0) {
 393                         NEXT_ARG();
 394                         d = *argv;
 395                 } else if (strcmp(*argv, "dst") == 0) {
 396                         NEXT_ARG();
 397                         if (dst_ok)
 398                                 duparg2("dst", *argv);
 399                         get_addr(&dst, *argv, preferred_family);
 400                         dst_ok = 1;
 401                 } else if (strcmp(*argv, "port") == 0) {
 402
 403                         NEXT_ARG();
 404                         port = strtoul(*argv, &endptr, 0);
 405                         if (endptr && *endptr) {
 406                                 struct servent *pse;
 407
 408                                 pse = getservbyname(*argv, "udp");
 409                                 if (!pse)
 410                                         invarg("invalid port\n", *argv);
 411                                 port = ntohs(pse->s_port);
 412                         } else if (port > 0xffff)
 413                                 invarg("invalid port\n", *argv);
 414                 } else if (strcmp(*argv, "vni") == 0) {
 415                         NEXT_ARG();
 416                         vni = strtoul(*argv, &endptr, 0);
 417                         if ((endptr && *endptr) ||
 418                             (vni >> 24) || vni == ULONG_MAX)
 419                                 invarg("invalid VNI\n", *argv);
 420                 } else if (strcmp(*argv, "via") == 0) {
 421                         NEXT_ARG();
 422                         via = if_nametoindex(*argv);
 423                         if (via == 0)
 424                                 invarg("invalid device\n", *argv);
 425                 } else if (strcmp(*argv, "self") == 0) {
 426                         req.ndm.ndm_flags |= NTF_SELF;
 427                 } else if (matches(*argv, "master") == 0) {
 428                         req.ndm.ndm_flags |= NTF_MASTER;
 429                 } else if (matches(*argv, "router") == 0) {
 430                         req.ndm.ndm_flags |= NTF_ROUTER;
 431                 } else if (matches(*argv, "local") == 0 ||
 432                            matches(*argv, "permanent") == 0) {
 433                         req.ndm.ndm_state |= NUD_PERMANENT;
 434                 } else if (matches(*argv, "temp") == 0 ||
 435                            matches(*argv, "static") == 0) {
 436                         req.ndm.ndm_state |= NUD_REACHABLE;
 437                 } else if (matches(*argv, "dynamic") == 0) {
 438                         req.ndm.ndm_state |= NUD_REACHABLE;
 439                         req.ndm.ndm_state &= ~NUD_NOARP;
 440                 } else if (matches(*argv, "vlan") == 0) {
 441                         if (vid >= 0)
 442                                 duparg2("vlan", *argv);
 443                         NEXT_ARG();
 444                         vid = atoi(*argv);
 445                 } else if (matches(*argv, "use") == 0) {
 446                         req.ndm.ndm_flags |= NTF_USE;
 447                 } else {
 448                         if (strcmp(*argv, "to") == 0) {
 449                                 NEXT_ARG();
 450                         }
 451                         if (matches(*argv, "help") == 0)
 452                                 usage();
 453                         if (addr)
 454                                 duparg2("to", *argv);
 455                         addr = *argv;
 456                 }
 457                 argc--; argv++;
 458         }
 459
 460         if (d == NULL || addr == NULL) {
 461                 fprintf(stderr, "Device and address are required arguments.\n");
 462                 return -1;
 463         }
 464
 465         /* Assume self */
 466         if (!(req.ndm.ndm_flags&(NTF_SELF|NTF_MASTER)))
 467                 req.ndm.ndm_flags |= NTF_SELF;
 468
 469         /* Assume permanent */
 470         if (!(req.ndm.ndm_state&(NUD_PERMANENT|NUD_REACHABLE)))
 471                 req.ndm.ndm_state |= NUD_PERMANENT;
 472
 473         if (sscanf(addr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
 474                    abuf, abuf+1, abuf+2,
 475                    abuf+3, abuf+4, abuf+5) != 6) {
 476                 fprintf(stderr, "Invalid mac address %s\n", addr);
 477                 return -1;
 478         }
 479
 480         addattr_l(&req.n, sizeof(req), NDA_LLADDR, abuf, ETH_ALEN);
 481         if (dst_ok)
 482                 addattr_l(&req.n, sizeof(req), NDA_DST, &dst.data, dst.bytelen);
 483
 484         if (vid >= 0)
 485                 addattr16(&req.n, sizeof(req), NDA_VLAN, vid);
 486
 487         if (port) {
 488                 unsigned short dport;
 489
 490                 dport = htons((unsigned short)port);
 491                 addattr16(&req.n, sizeof(req), NDA_PORT, dport);
 492         }
 493         if (vni != ~0)
 494                 addattr32(&req.n, sizeof(req), NDA_VNI, vni);
 495         if (via)
 496                 addattr32(&req.n, sizeof(req), NDA_IFINDEX, via);
 497
 498         req.ndm.ndm_ifindex = ll_name_to_index(d);
 499         if (req.ndm.ndm_ifindex == 0) {
 500                 fprintf(stderr, "Cannot find device \"%s\"\n", d);
 501                 return -1;
 502         }
 503
 504         if (rtnl_talk(&rth, &req.n, NULL, 0) < 0)
 505                 return -1;
 506
 507         return 0;
 508 }
 509
 510 int do_fdb(int argc, char **argv)
 511 {
 512         ll_init_map(&rth);
 513
 514         if (argc > 0) {
 515                 if (matches(*argv, "add") == 0)
 516                         return fdb_modify(RTM_NEWNEIGH, NLM_F_CREATE|NLM_F_EXCL, argc-1, argv+1);
 517                 if (matches(*argv, "append") == 0)
 518                         return fdb_modify(RTM_NEWNEIGH, NLM_F_CREATE|NLM_F_APPEND, argc-1, argv+1);
 519                 if (matches(*argv, "replace") == 0)
 520                         return fdb_modify(RTM_NEWNEIGH, NLM_F_CREATE|NLM_F_REPLACE, argc-1, argv+1);
 521                 if (matches(*argv, "delete") == 0)
 522                         return fdb_modify(RTM_DELNEIGH, 0, argc-1, argv+1);
 523                 if (matches(*argv, "show") == 0 ||
 524                     matches(*argv, "lst") == 0 ||
 525                     matches(*argv, "list") == 0)
 526                         return fdb_show(argc-1, argv+1);
 527                 if (matches(*argv, "help") == 0)
 528                         usage();
 529         } else
 530                 return fdb_show(0, NULL);
 531
 532         fprintf(stderr, "Command \"%s\" is unknown, try \"bridge fdb help\".\n", *argv);
 533         exit(-1);
 534 }