src/daemon/edp.c

   1 /* -*- mode: c; c-file-style: "openbsd" -*- */
   2 /*
   3  * Copyright (c) 2008 Vincent Bernat <bernat@luffy.cx>
   4  *
   5  * Permission to use, copy, modify, and/or distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #include "lldpd.h"
  19 #include "frame.h"
  20
  21 #ifdef ENABLE_EDP
  22
  23 #include <stdio.h>
  24 #include <unistd.h>
  25 #include <errno.h>
  26 #include <arpa/inet.h>
  27 #include <fnmatch.h>
  28 #include <assert.h>
  29
  30 static int seq = 0;
  31
  32 int
  33 edp_send(struct lldpd *global,
  34          struct lldpd_hardware *hardware)
  35 {
  36         const u_int8_t mcastaddr[] = EDP_MULTICAST_ADDR;
  37         const u_int8_t llcorg[] = LLC_ORG_EXTREME;
  38         struct lldpd_chassis *chassis;
  39         int length, i, v;
  40         u_int8_t *packet, *pos, *pos_llc, *pos_len_eh, *pos_len_edp, *pos_edp, *tlv, *end;
  41         u_int16_t checksum;
  42 #ifdef ENABLE_DOT1
  43         struct lldpd_vlan *vlan;
  44         unsigned int state = 0;
  45 #endif
  46         u_int8_t edp_fakeversion[] = {7, 6, 4, 99};
  47         /* Subsequent XXX can be replaced by other values. We place
  48            them here to ensure the position of "" to be a bit
  49            invariant with version changes. */
  50         char *deviceslot[] = { "eth", "veth", "XXX", "XXX", "XXX", "XXX", "XXX", "XXX", "", NULL };
  51
  52         log_debug("edp", "send EDP frame on port %s", hardware->h_ifname);
  53
  54         chassis = hardware->h_lport.p_chassis;
  55 #ifdef ENABLE_DOT1
  56         while (state != 2) {
  57 #endif
  58                 length = hardware->h_mtu;
  59                 if ((packet = (u_int8_t*)malloc(length)) == NULL)
  60                         return ENOMEM;
  61                 memset(packet, 0, length);
  62                 pos = packet;
  63                 v = 0;
  64
  65                 /* Ethernet header */
  66                 if (!(
  67                       POKE_BYTES(mcastaddr, sizeof(mcastaddr)) &&
  68                       POKE_BYTES(&hardware->h_lladdr, sizeof(hardware->h_lladdr)) &&
  69                       POKE_SAVE(pos_len_eh) && /* We compute the len later */
  70                       POKE_UINT16(0)))
  71                         goto toobig;
  72
  73                 /* LLC */
  74                 if (!(
  75                       POKE_SAVE(pos_llc) && /* We need to save our
  76                                                current position to
  77                                                compute ethernet len */
  78                       /* SSAP and DSAP */
  79                       POKE_UINT8(0xaa) && POKE_UINT8(0xaa) &&
  80                       /* Control field */
  81                       POKE_UINT8(0x03) &&
  82                       /* ORG */
  83                       POKE_BYTES(llcorg, sizeof(llcorg)) &&
  84                       POKE_UINT16(LLC_PID_EDP)))
  85                         goto toobig;
  86
  87                 /* EDP header */
  88                 if ((chassis->c_id_len != ETH_ALEN) ||
  89                     (chassis->c_id_subtype != LLDP_CHASSISID_SUBTYPE_LLADDR)) {
  90                         log_warnx("edp", "local chassis does not use MAC address as chassis ID!?");
  91                         free(packet);
  92                         return EINVAL;
  93                 }
  94                 if (!(
  95                       POKE_SAVE(pos_edp) && /* Save the start of EDP frame */
  96                       POKE_UINT8(1) && POKE_UINT8(0) &&
  97                       POKE_SAVE(pos_len_edp) && /* We compute the len
  98                                                    and the checksum
  99                                                    later */
 100                       POKE_UINT32(0) && /* Len + Checksum */
 101                       POKE_UINT16(seq) &&
 102                       POKE_UINT16(0) &&
 103                       POKE_BYTES(chassis->c_id, ETH_ALEN)))
 104                         goto toobig;
 105                 seq++;
 106
 107 #ifdef ENABLE_DOT1
 108                 switch (state) {
 109                 case 0:
 110 #endif
 111                         /* Display TLV */
 112                         if (!(
 113                               POKE_START_EDP_TLV(EDP_TLV_DISPLAY) &&
 114                               POKE_BYTES(chassis->c_name, strlen(chassis->c_name)) &&
 115                               POKE_UINT8(0) && /* Add a NULL character
 116                                                   for better
 117                                                   compatibility */
 118                               POKE_END_EDP_TLV))
 119                                 goto toobig;
 120
 121                         /* Info TLV */
 122                         if (!(
 123                               POKE_START_EDP_TLV(EDP_TLV_INFO)))
 124                                 goto toobig;
 125                         /* We try to emulate the slot thing */
 126                         for (i=0; deviceslot[i] != NULL; i++) {
 127                                 if (strncmp(hardware->h_ifname, deviceslot[i],
 128                                         strlen(deviceslot[i])) == 0) {
 129                                         if (!(
 130                                               POKE_UINT16(i) &&
 131                                               POKE_UINT16(atoi(hardware->h_ifname +
 132                                                                strlen(deviceslot[i])))))
 133                                                 goto toobig;
 134                                         break;
 135                                 }
 136                         }
 137                         /* If we don't find a "slot", we say that the
 138                            interface is in slot 8 */
 139                         if (deviceslot[i] == NULL) {
 140                                 if (!(
 141                                       POKE_UINT16(8) &&
 142                                       POKE_UINT16(hardware->h_ifindex)))
 143                                         goto toobig;
 144                         }
 145                         if (!(
 146                               POKE_UINT16(0) && /* vchassis */
 147                               POKE_UINT32(0) && POKE_UINT16(0) && /* Reserved */
 148                               /* Version */
 149                               POKE_BYTES(edp_fakeversion, sizeof(edp_fakeversion)) &&
 150                               /* Connections, we say that we won't
 151                                  have more interfaces than this
 152                                  mask. */
 153                               POKE_UINT32(0xffffffff) &&
 154                               POKE_UINT32(0) && POKE_UINT32(0) && POKE_UINT32(0) &&
 155                               POKE_END_EDP_TLV))
 156                                 goto toobig;
 157
 158 #ifdef ENABLE_DOT1
 159                         break;
 160                 case 1:
 161                         TAILQ_FOREACH(vlan, &hardware->h_lport.p_vlans,
 162                             v_entries) {
 163                                 v++;
 164                                 if (!(
 165                                       POKE_START_EDP_TLV(EDP_TLV_VLAN) &&
 166                                       POKE_UINT8(0) && /* Flags: no IP address */
 167                                       POKE_UINT8(0) && /* Reserved */
 168                                       POKE_UINT16(vlan->v_vid) &&
 169                                       POKE_UINT32(0) && /* Reserved */
 170                                       POKE_UINT32(0) && /* IP address */
 171                                       /* VLAN name */
 172                                       POKE_BYTES(vlan->v_name, strlen(vlan->v_name)) &&
 173                                       POKE_UINT8(0) &&
 174                                       POKE_END_EDP_TLV))
 175                                         goto toobig;
 176                         }
 177                         break;
 178                 }
 179
 180                 if ((state == 1) && (v == 0))   /* No VLAN, no need to send another TLV */
 181                         break;
 182 #endif
 183
 184                 /* Null TLV */
 185                 if (!(
 186                       POKE_START_EDP_TLV(EDP_TLV_NULL) &&
 187                       POKE_END_EDP_TLV &&
 188                       POKE_SAVE(end)))
 189                         goto toobig;
 190
 191                 /* Compute len and checksum */
 192                 i = end - pos_llc; /* Ethernet length */
 193                 v = end - pos_edp; /* EDP length */
 194                 POKE_RESTORE(pos_len_eh);
 195                 if (!(POKE_UINT16(i))) goto toobig;
 196                 POKE_RESTORE(pos_len_edp);
 197                 if (!(POKE_UINT16(v))) goto toobig;
 198                 checksum = frame_checksum(pos_edp, v, 0);
 199                 if (!(POKE_UINT16(ntohs(checksum)))) goto toobig;
 200
 201                 if (hardware->h_ops->send(global, hardware,
 202                         (char *)packet, end - packet) == -1) {
 203                         log_warn("edp", "unable to send packet on real device for %s",
 204                             hardware->h_ifname);
 205                         free(packet);
 206                         return ENETDOWN;
 207                 }
 208                 free(packet);
 209
 210 #ifdef ENABLE_DOT1
 211                 state++;
 212         }
 213 #endif
 214
 215         hardware->h_tx_cnt++;
 216         return 0;
 217  toobig:
 218         free(packet);
 219         return E2BIG;
 220 }
 221
 222 #define CHECK_TLV_SIZE(x, name)                            \
 223         do { if (tlv_len < (x)) {                          \
 224                         log_warnx("edp", name " EDP TLV too short received on %s", \
 225                hardware->h_ifname);                        \
 226            goto malformed;                                 \
 227         } } while (0)
 228
 229 int
 230 edp_decode(struct lldpd *cfg, char *frame, int s,
 231     struct lldpd_hardware *hardware,
 232     struct lldpd_chassis **newchassis, struct lldpd_port **newport)
 233 {
 234         struct lldpd_chassis *chassis;
 235         struct lldpd_port *port;
 236 #ifdef ENABLE_DOT1
 237         struct lldpd_mgmt *mgmt, *mgmt_next, *m;
 238         struct lldpd_vlan *lvlan = NULL, *lvlan_next;
 239 #endif
 240         const unsigned char edpaddr[] = EDP_MULTICAST_ADDR;
 241         int length, gotend = 0, gotvlans = 0, edp_len, tlv_len, tlv_type;
 242         int edp_port, edp_slot;
 243         u_int8_t *pos, *pos_edp, *tlv;
 244         u_int8_t version[4];
 245 #ifdef ENABLE_DOT1
 246         struct in_addr address;
 247         struct lldpd_port *oport;
 248 #endif
 249
 250         log_debug("edp", "decode EDP frame on port %s",
 251             hardware->h_ifname);
 252
 253         if ((chassis = calloc(1, sizeof(struct lldpd_chassis))) == NULL) {
 254                 log_warn("edp", "failed to allocate remote chassis");
 255                 return -1;
 256         }
 257         TAILQ_INIT(&chassis->c_mgmt);
 258         if ((port = calloc(1, sizeof(struct lldpd_port))) == NULL) {
 259                 log_warn("edp", "failed to allocate remote port");
 260                 free(chassis);
 261                 return -1;
 262         }
 263 #ifdef ENABLE_DOT1
 264         TAILQ_INIT(&port->p_vlans);
 265 #endif
 266
 267         length = s;
 268         pos = (u_int8_t*)frame;
 269
 270         if (length < 2*ETH_ALEN + sizeof(u_int16_t) + 8 /* LLC */ +
 271             10 + ETH_ALEN /* EDP header */) {
 272                 log_warnx("edp", "too short EDP frame received on %s", hardware->h_ifname);
 273                 goto malformed;
 274         }
 275
 276         if (PEEK_CMP(edpaddr, sizeof(edpaddr)) != 0) {
 277                 log_info("edp", "frame not targeted at EDP multicast address received on %s",
 278                     hardware->h_ifname);
 279                 goto malformed;
 280         }
 281         PEEK_DISCARD(ETH_ALEN); PEEK_DISCARD_UINT16;
 282         PEEK_DISCARD(6);        /* LLC: DSAP + SSAP + control + org */
 283         if (PEEK_UINT16 != LLC_PID_EDP) {
 284                 log_debug("edp", "incorrect LLC protocol ID received on %s",
 285                     hardware->h_ifname);
 286                 goto malformed;
 287         }
 288
 289         PEEK_SAVE(pos_edp);     /* Save the start of EDP packet */
 290         if (PEEK_UINT8 != 1) {
 291                 log_warnx("edp", "incorrect EDP version for frame received on %s",
 292                     hardware->h_ifname);
 293                 goto malformed;
 294         }
 295         PEEK_DISCARD_UINT8;     /* Reserved */
 296         edp_len = PEEK_UINT16;
 297         PEEK_DISCARD_UINT16;    /* Checksum */
 298         PEEK_DISCARD_UINT16;    /* Sequence */
 299         if (PEEK_UINT16 != 0) { /* ID Type = 0 = MAC */
 300                 log_warnx("edp", "incorrect device id type for frame received on %s",
 301                     hardware->h_ifname);
 302                 goto malformed;
 303         }
 304         if (edp_len > length + 10) {
 305                 log_warnx("edp", "incorrect size for EDP frame received on %s",
 306                     hardware->h_ifname);
 307                 goto malformed;
 308         }
 309         chassis->c_ttl = LLDPD_TTL;
 310         chassis->c_id_subtype = LLDP_CHASSISID_SUBTYPE_LLADDR;
 311         chassis->c_id_len = ETH_ALEN;
 312         if ((chassis->c_id = (char *)malloc(ETH_ALEN)) == NULL) {
 313                 log_warn("edp", "unable to allocate memory for chassis ID");
 314                 goto malformed;
 315         }
 316         PEEK_BYTES(chassis->c_id, ETH_ALEN);
 317
 318         /* Let's check checksum */
 319         if (frame_checksum(pos_edp, edp_len, 0) != 0) {
 320                 log_warnx("edp", "incorrect EDP checksum for frame received on %s",
 321                     hardware->h_ifname);
 322                 goto malformed;
 323         }
 324
 325         while (length && !gotend) {
 326                 if (length < 4) {
 327                         log_warnx("edp", "EDP TLV header is too large for "
 328                             "frame received on %s",
 329                             hardware->h_ifname);
 330                         goto malformed;
 331                 }
 332                 if (PEEK_UINT8 != EDP_TLV_MARKER) {
 333                         log_warnx("edp", "incorrect marker starting EDP TLV header for frame "
 334                             "received on %s",
 335                             hardware->h_ifname);
 336                         goto malformed;
 337                 }
 338                 tlv_type = PEEK_UINT8;
 339                 tlv_len = PEEK_UINT16 - 4;
 340                 PEEK_SAVE(tlv);
 341                 if ((tlv_len < 0) || (tlv_len > length)) {
 342                         log_debug("edp", "incorrect size in EDP TLV header for frame "
 343                             "received on %s",
 344                             hardware->h_ifname);
 345                         /* Some poor old Extreme Summit are quite bogus */
 346                         gotend = 1;
 347                         break;
 348                 }
 349                 switch (tlv_type) {
 350                 case EDP_TLV_INFO:
 351                         CHECK_TLV_SIZE(32, "Info");
 352                         port->p_id_subtype = LLDP_PORTID_SUBTYPE_IFNAME;
 353                         edp_slot = PEEK_UINT16; edp_port = PEEK_UINT16;
 354                         if (asprintf(&port->p_id, "%d/%d",
 355                                 edp_slot + 1, edp_port + 1) == -1) {
 356                                 log_warn("edp", "unable to allocate memory for "
 357                                     "port ID");
 358                                 goto malformed;
 359                         }
 360                         port->p_id_len = strlen(port->p_id);
 361                         if (asprintf(&port->p_descr, "Slot %d / Port %d",
 362                                 edp_slot + 1, edp_port + 1) == -1) {
 363                                 log_warn("edp", "unable to allocate memory for "
 364                                     "port description");
 365                                 goto malformed;
 366                         }
 367                         PEEK_DISCARD_UINT16; /* vchassis */
 368                         PEEK_DISCARD(6);     /* Reserved */
 369                         PEEK_BYTES(version, 4);
 370                         if (asprintf(&chassis->c_descr,
 371                                 "EDP enabled device, version %d.%d.%d.%d",
 372                                 version[0], version[1],
 373                                 version[2], version[3]) == -1) {
 374                                 log_warn("edp", "unable to allocate memory for "
 375                                     "chassis description");
 376                                 goto malformed;
 377                         }
 378                         break;
 379                 case EDP_TLV_DISPLAY:
 380                         if ((chassis->c_name = (char *)calloc(1, tlv_len + 1)) == NULL) {
 381                                 log_warn("edp", "unable to allocate memory for chassis "
 382                                     "name");
 383                                 goto malformed;
 384                         }
 385                         /* TLV display contains a lot of garbage */
 386                         PEEK_BYTES(chassis->c_name, tlv_len);
 387                         break;
 388                 case EDP_TLV_NULL:
 389                         if (tlv_len != 0) {
 390                                 log_warnx("edp", "null tlv with incorrect size in frame "
 391                                     "received on %s",
 392                                     hardware->h_ifname);
 393                                 goto malformed;
 394                         }
 395                         if (length)
 396                                 log_debug("edp", "extra data after edp frame on %s",
 397                                     hardware->h_ifname);
 398                         gotend = 1;
 399                         break;
 400                 case EDP_TLV_VLAN:
 401 #ifdef ENABLE_DOT1
 402                         CHECK_TLV_SIZE(12, "VLAN");
 403                         if ((lvlan = (struct lldpd_vlan *)calloc(1,
 404                                     sizeof(struct lldpd_vlan))) == NULL) {
 405                                 log_warn("edp", "unable to allocate vlan");
 406                                 goto malformed;
 407                         }
 408                         PEEK_DISCARD_UINT16; /* Flags + reserved */
 409                         lvlan->v_vid = PEEK_UINT16; /* VID */
 410                         PEEK_DISCARD(4);            /* Reserved */
 411                         PEEK_BYTES(&address, sizeof(address));
 412
 413                         if ((lvlan->v_name = (char *)calloc(1,
 414                                     tlv_len + 1 - 12)) == NULL) {
 415                                 log_warn("edp", "unable to allocate vlan name");
 416                                 free(lvlan);
 417                                 goto malformed;
 418                         }
 419                         PEEK_BYTES(lvlan->v_name, tlv_len - 12);
 420
 421                         if (address.s_addr != INADDR_ANY) {
 422                                 mgmt = lldpd_alloc_mgmt(LLDPD_AF_IPV4, &address,
 423                                                         sizeof(struct in_addr), 0);
 424                                 if (mgmt == NULL) {
 425                                         assert(errno == ENOMEM);
 426                                         log_warn("edp", "Out of memory");
 427                                         goto malformed;
 428                                 }
 429                                 TAILQ_INSERT_TAIL(&chassis->c_mgmt, mgmt, m_entries);
 430                         }
 431                         TAILQ_INSERT_TAIL(&port->p_vlans,
 432                             lvlan, v_entries);
 433 #endif
 434                         gotvlans = 1;
 435                         break;
 436                 default:
 437                         log_debug("edp", "unknown EDP TLV type (%d) received on %s",
 438                             tlv_type, hardware->h_ifname);
 439                         hardware->h_rx_unrecognized_cnt++;
 440                 }
 441                 PEEK_DISCARD(tlv + tlv_len - pos);
 442         }
 443         if ((chassis->c_id == NULL) ||
 444             (port->p_id == NULL) ||
 445             (chassis->c_name == NULL) ||
 446             (chassis->c_descr == NULL) ||
 447             (port->p_descr == NULL) ||
 448             (gotend == 0)) {
 449 #ifdef ENABLE_DOT1
 450                 if (gotvlans && gotend) {
 451                         /* VLAN can be sent in a separate frames. We need to add
 452                          * those vlans to an existing port */
 453                         TAILQ_FOREACH(oport, &hardware->h_rports, p_entries) {
 454                                 if (!((oport->p_protocol == LLDPD_MODE_EDP) &&
 455                                         (oport->p_chassis->c_id_subtype ==
 456                                             chassis->c_id_subtype) &&
 457                                         (oport->p_chassis->c_id_len == chassis->c_id_len) &&
 458                                         (memcmp(oport->p_chassis->c_id, chassis->c_id,
 459                                             chassis->c_id_len) == 0)))
 460                                         continue;
 461                                 /* We attach the VLANs to the found port */
 462                                 lldpd_vlan_cleanup(oport);
 463                                 for (lvlan = TAILQ_FIRST(&port->p_vlans);
 464                                      lvlan != NULL;
 465                                      lvlan = lvlan_next) {
 466                                         lvlan_next = TAILQ_NEXT(lvlan, v_entries);
 467                                         TAILQ_REMOVE(&port->p_vlans, lvlan, v_entries);
 468                                         TAILQ_INSERT_TAIL(&oport->p_vlans,
 469                                             lvlan, v_entries);
 470                                 }
 471                                 /* And the IP addresses */
 472                                 for (mgmt = TAILQ_FIRST(&chassis->c_mgmt);
 473                                      mgmt != NULL;
 474                                      mgmt = mgmt_next) {
 475                                         mgmt_next = TAILQ_NEXT(mgmt, m_entries);
 476                                         TAILQ_REMOVE(&chassis->c_mgmt, mgmt, m_entries);
 477                                         /* Don't add an address that already exists! */
 478                                         TAILQ_FOREACH(m, &chassis->c_mgmt, m_entries)
 479                                             if (m->m_family == mgmt->m_family &&
 480                                                 !memcmp(&m->m_addr, &mgmt->m_addr,
 481                                                     sizeof(m->m_addr))) break;
 482                                         if (m == NULL)
 483                                                 TAILQ_INSERT_TAIL(&oport->p_chassis->c_mgmt,
 484                                                     mgmt, m_entries);
 485                                 }
 486                         }
 487                         /* We discard the remaining frame */
 488                         goto malformed;
 489                 }
 490 #else
 491                 if (gotvlans)
 492                         goto malformed;
 493 #endif
 494                 log_warnx("edp", "some mandatory tlv are missing for frame received on %s",
 495                     hardware->h_ifname);
 496                 goto malformed;
 497         }
 498         *newchassis = chassis;
 499         *newport = port;
 500         return 1;
 501
 502 malformed:
 503         lldpd_chassis_cleanup(chassis, 1);
 504         lldpd_port_cleanup(port, 1);
 505         free(port);
 506         return -1;
 507 }
 508
 509 #endif /* ENABLE_EDP */