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