ldpd/address.c

   1 /*      $OpenBSD$ */
   2
   3 /*
   4  * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
   5  *
   6  * Permission to use, copy, modify, and distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 #include <zebra.h>
  20
  21 #include "ldpd.h"
  22 #include "ldpe.h"
  23 #include "lde.h"
  24 #include "log.h"
  25 #include "ldp_debug.h"
  26
  27 static void      send_address(struct nbr *, int, struct if_addr_head *,
  28                     unsigned int, int);
  29 static int       gen_address_list_tlv(struct ibuf *, int, struct if_addr_head *,
  30                     unsigned int);
  31 static int       gen_mac_list_tlv(struct ibuf *, uint8_t *);
  32 static void      address_list_add(struct if_addr_head *, struct if_addr *);
  33 static void      address_list_clr(struct if_addr_head *);
  34 static void      log_msg_address(int, uint16_t, struct nbr *, int,
  35                     union ldpd_addr *);
  36 static void      log_msg_mac_withdrawal(int, struct nbr *, uint8_t *);
  37
  38 static void
  39 send_address(struct nbr *nbr, int af, struct if_addr_head *addr_list,
  40     unsigned int addr_count, int withdraw)
  41 {
  42         struct ibuf     *buf;
  43         uint16_t         msg_type;
  44         uint8_t          addr_size;
  45         struct if_addr  *if_addr;
  46         uint16_t         size;
  47         unsigned int     tlv_addr_count = 0;
  48         int              err = 0;
  49
  50         /* nothing to send */
  51         if (LIST_EMPTY(addr_list))
  52                 return;
  53
  54         if (!withdraw)
  55                 msg_type = MSG_TYPE_ADDR;
  56         else
  57                 msg_type = MSG_TYPE_ADDRWITHDRAW;
  58
  59         switch (af) {
  60         case AF_INET:
  61                 addr_size = sizeof(struct in_addr);
  62                 break;
  63         case AF_INET6:
  64                 addr_size = sizeof(struct in6_addr);
  65                 break;
  66         default:
  67                 fatalx("send_address: unknown af");
  68         }
  69
  70         while ((if_addr = LIST_FIRST(addr_list)) != NULL) {
  71                 /*
  72                  * Send as many addresses as possible - respect the session's
  73                  * negotiated maximum pdu length.
  74                  */
  75                 size = LDP_HDR_SIZE + LDP_MSG_SIZE + ADDR_LIST_SIZE;
  76                 if (size + addr_count * addr_size <= nbr->max_pdu_len)
  77                         tlv_addr_count = addr_count;
  78                 else
  79                         tlv_addr_count = (nbr->max_pdu_len - size) / addr_size;
  80                 size += tlv_addr_count * addr_size;
  81                 addr_count -= tlv_addr_count;
  82
  83                 if ((buf = ibuf_open(size)) == NULL)
  84                         fatal(__func__);
  85
  86                 err |= gen_ldp_hdr(buf, size);
  87                 size -= LDP_HDR_SIZE;
  88                 err |= gen_msg_hdr(buf, msg_type, size);
  89                 size -= LDP_MSG_SIZE;
  90                 err |= gen_address_list_tlv(buf, af, addr_list, tlv_addr_count);
  91                 if (err) {
  92                         address_list_clr(addr_list);
  93                         ibuf_free(buf);
  94                         return;
  95                 }
  96
  97                 while ((if_addr = LIST_FIRST(addr_list)) != NULL) {
  98                         log_msg_address(1, msg_type, nbr, af, &if_addr->addr);
  99
 100                         LIST_REMOVE(if_addr, entry);
 101                         free(if_addr);
 102                         if (--tlv_addr_count == 0)
 103                                 break;
 104                 }
 105
 106                 evbuf_enqueue(&nbr->tcp->wbuf, buf);
 107         }
 108
 109         nbr_fsm(nbr, NBR_EVT_PDU_SENT);
 110 }
 111
 112 void
 113 send_address_single(struct nbr *nbr, struct if_addr *if_addr, int withdraw)
 114 {
 115         struct if_addr_head      addr_list;
 116
 117         LIST_INIT(&addr_list);
 118         address_list_add(&addr_list, if_addr);
 119         send_address(nbr, if_addr->af, &addr_list, 1, withdraw);
 120 }
 121
 122 void
 123 send_address_all(struct nbr *nbr, int af)
 124 {
 125         struct if_addr_head      addr_list;
 126         struct if_addr          *if_addr;
 127         unsigned int             addr_count = 0;
 128
 129         LIST_INIT(&addr_list);
 130         LIST_FOREACH(if_addr, &global.addr_list, entry) {
 131                 if (if_addr->af != af)
 132                         continue;
 133
 134                 address_list_add(&addr_list, if_addr);
 135                 addr_count++;
 136         }
 137
 138         send_address(nbr, af, &addr_list, addr_count, 0);
 139 }
 140
 141 void
 142 send_mac_withdrawal(struct nbr *nbr, struct map *fec, uint8_t *mac)
 143 {
 144         struct ibuf     *buf;
 145         uint16_t         size;
 146         int              err;
 147
 148         size = LDP_HDR_SIZE + LDP_MSG_SIZE + ADDR_LIST_SIZE + len_fec_tlv(fec) +
 149             TLV_HDR_SIZE;
 150         if (mac)
 151                 size += ETHER_ADDR_LEN;
 152
 153         if ((buf = ibuf_open(size)) == NULL)
 154                 fatal(__func__);
 155
 156         err = gen_ldp_hdr(buf, size);
 157         size -= LDP_HDR_SIZE;
 158         err |= gen_msg_hdr(buf, MSG_TYPE_ADDRWITHDRAW, size);
 159         size -= LDP_MSG_SIZE;
 160         err |= gen_address_list_tlv(buf, AF_INET, NULL, 0);
 161         err |= gen_fec_tlv(buf, fec);
 162         err |= gen_mac_list_tlv(buf, mac);
 163         if (err) {
 164                 ibuf_free(buf);
 165                 return;
 166         }
 167
 168         log_msg_mac_withdrawal(1, nbr, mac);
 169
 170         evbuf_enqueue(&nbr->tcp->wbuf, buf);
 171
 172         nbr_fsm(nbr, NBR_EVT_PDU_SENT);
 173 }
 174
 175 int
 176 recv_address(struct nbr *nbr, char *buf, uint16_t len)
 177 {
 178         struct ldp_msg          msg;
 179         uint16_t                msg_type;
 180         enum imsg_type          type;
 181         struct address_list_tlv alt;
 182         uint16_t                alt_len;
 183         uint16_t                alt_family;
 184         struct lde_addr         lde_addr;
 185
 186         memcpy(&msg, buf, sizeof(msg));
 187         msg_type = ntohs(msg.type);
 188         switch (msg_type) {
 189         case MSG_TYPE_ADDR:
 190                 type = IMSG_ADDRESS_ADD;
 191                 break;
 192         case MSG_TYPE_ADDRWITHDRAW:
 193                 type = IMSG_ADDRESS_DEL;
 194                 break;
 195         default:
 196                 fatalx("recv_address: unexpected msg type");
 197         }
 198         buf += LDP_MSG_SIZE;
 199         len -= LDP_MSG_SIZE;
 200
 201         /* Address List TLV */
 202         if (len < ADDR_LIST_SIZE) {
 203                 session_shutdown(nbr, S_BAD_MSG_LEN, msg.id, msg.type);
 204                 return (-1);
 205         }
 206         memcpy(&alt, buf, sizeof(alt));
 207         alt_len = ntohs(alt.length);
 208         alt_family = ntohs(alt.family);
 209         if (alt_len > len - TLV_HDR_SIZE) {
 210                 session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, msg.type);
 211                 return (-1);
 212         }
 213         if (ntohs(alt.type) != TLV_TYPE_ADDRLIST) {
 214                 send_notification(nbr->tcp, S_MISS_MSG, msg.id, msg.type);
 215                 return (-1);
 216         }
 217         switch (alt_family) {
 218         case AF_IPV4:
 219                 if (!nbr->v4_enabled)
 220                         /* just ignore the message */
 221                         return (0);
 222                 break;
 223         case AF_IPV6:
 224                 if (!nbr->v6_enabled)
 225                         /* just ignore the message */
 226                         return (0);
 227                 break;
 228         default:
 229                 send_notification(nbr->tcp, S_UNSUP_ADDR, msg.id, msg.type);
 230                 return (-1);
 231         }
 232         alt_len -= sizeof(alt.family);
 233         buf += sizeof(alt);
 234         len -= sizeof(alt);
 235
 236         /* Process all received addresses */
 237         while (alt_len > 0) {
 238                 switch (alt_family) {
 239                 case AF_IPV4:
 240                         if (alt_len < sizeof(struct in_addr)) {
 241                                 session_shutdown(nbr, S_BAD_TLV_LEN, msg.id,
 242                                     msg.type);
 243                                 return (-1);
 244                         }
 245
 246                         memset(&lde_addr, 0, sizeof(lde_addr));
 247                         lde_addr.af = AF_INET;
 248                         memcpy(&lde_addr.addr, buf, sizeof(struct in_addr));
 249
 250                         buf += sizeof(struct in_addr);
 251                         len -= sizeof(struct in_addr);
 252                         alt_len -= sizeof(struct in_addr);
 253                         break;
 254                 case AF_IPV6:
 255                         if (alt_len < sizeof(struct in6_addr)) {
 256                                 session_shutdown(nbr, S_BAD_TLV_LEN, msg.id,
 257                                     msg.type);
 258                                 return (-1);
 259                         }
 260
 261                         memset(&lde_addr, 0, sizeof(lde_addr));
 262                         lde_addr.af = AF_INET6;
 263                         memcpy(&lde_addr.addr, buf, sizeof(struct in6_addr));
 264
 265                         buf += sizeof(struct in6_addr);
 266                         len -= sizeof(struct in6_addr);
 267                         alt_len -= sizeof(struct in6_addr);
 268                         break;
 269                 default:
 270                         fatalx("recv_address: unknown af");
 271                 }
 272
 273                 log_msg_address(0, msg_type, nbr, lde_addr.af, &lde_addr.addr);
 274
 275                 ldpe_imsg_compose_lde(type, nbr->peerid, 0, &lde_addr,
 276                     sizeof(lde_addr));
 277         }
 278
 279         /* Optional Parameters */
 280         while (len > 0) {
 281                 struct tlv      tlv;
 282                 uint16_t        tlv_type;
 283                 uint16_t        tlv_len;
 284
 285                 if (len < sizeof(tlv)) {
 286                         session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, msg.type);
 287                         return (-1);
 288                 }
 289
 290                 memcpy(&tlv, buf, TLV_HDR_SIZE);
 291                 tlv_type = ntohs(tlv.type);
 292                 tlv_len = ntohs(tlv.length);
 293                 if (tlv_len + TLV_HDR_SIZE > len) {
 294                         session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, msg.type);
 295                         return (-1);
 296                 }
 297                 buf += TLV_HDR_SIZE;
 298                 len -= TLV_HDR_SIZE;
 299
 300                 switch (tlv_type) {
 301                 default:
 302                         if (!(ntohs(tlv.type) & UNKNOWN_FLAG))
 303                                 send_notification_rtlvs(nbr, S_UNKNOWN_TLV,
 304                                     msg.id, msg.type, tlv_type, tlv_len, buf);
 305                         /* ignore unknown tlv */
 306                         break;
 307                 }
 308                 buf += tlv_len;
 309                 len -= tlv_len;
 310         }
 311
 312         return (0);
 313 }
 314
 315 static int
 316 gen_address_list_tlv(struct ibuf *buf, int af, struct if_addr_head *addr_list,
 317     unsigned int tlv_addr_count)
 318 {
 319         struct address_list_tlv  alt;
 320         uint16_t                 addr_size;
 321         struct if_addr          *if_addr;
 322         int                      err = 0;
 323
 324         memset(&alt, 0, sizeof(alt));
 325         alt.type = htons(TLV_TYPE_ADDRLIST);
 326
 327         switch (af) {
 328         case AF_INET:
 329                 alt.family = htons(AF_IPV4);
 330                 addr_size = sizeof(struct in_addr);
 331                 break;
 332         case AF_INET6:
 333                 alt.family = htons(AF_IPV6);
 334                 addr_size = sizeof(struct in6_addr);
 335                 break;
 336         default:
 337                 fatalx("gen_address_list_tlv: unknown af");
 338         }
 339         alt.length = htons(sizeof(alt.family) + addr_size * tlv_addr_count);
 340
 341         err |= ibuf_add(buf, &alt, sizeof(alt));
 342         if (addr_list == NULL)
 343                 return (err);
 344
 345         LIST_FOREACH(if_addr, addr_list, entry) {
 346                 err |= ibuf_add(buf, &if_addr->addr, addr_size);
 347                 if (--tlv_addr_count == 0)
 348                         break;
 349         }
 350
 351         return (err);
 352 }
 353
 354 static int
 355 gen_mac_list_tlv(struct ibuf *buf, uint8_t *mac)
 356 {
 357         struct tlv       tlv;
 358         int              err;
 359
 360         memset(&tlv, 0, sizeof(tlv));
 361         tlv.type = htons(TLV_TYPE_MAC_LIST);
 362         if (mac)
 363                 tlv.length = htons(ETHER_ADDR_LEN);
 364         err = ibuf_add(buf, &tlv, sizeof(tlv));
 365         if (mac)
 366                 err |= ibuf_add(buf, mac, ETHER_ADDR_LEN);
 367
 368         return (err);
 369 }
 370
 371 static void
 372 address_list_add(struct if_addr_head *addr_list, struct if_addr *if_addr)
 373 {
 374         struct if_addr          *new;
 375
 376         new = malloc(sizeof(*new));
 377         if (new == NULL)
 378                 fatal(__func__);
 379         *new = *if_addr;
 380
 381         LIST_INSERT_HEAD(addr_list, new, entry);
 382 }
 383
 384 static void
 385 address_list_clr(struct if_addr_head *addr_list)
 386 {
 387         struct if_addr          *if_addr;
 388
 389         while ((if_addr = LIST_FIRST(addr_list)) != NULL) {
 390                 LIST_REMOVE(if_addr, entry);
 391                 free(if_addr);
 392         }
 393 }
 394
 395 static void
 396 log_msg_address(int out, uint16_t msg_type, struct nbr *nbr, int af,
 397     union ldpd_addr *addr)
 398 {
 399         debug_msg(out, "%s: lsr-id %s, address %s", msg_name(msg_type),
 400             inet_ntoa(nbr->id), log_addr(af, addr));
 401 }
 402
 403 static void
 404 log_msg_mac_withdrawal(int out, struct nbr *nbr, uint8_t *mac)
 405 {
 406         char buf[ETHER_ADDR_STRLEN];
 407
 408         debug_msg(out, "mac withdrawal: lsr-id %s, mac %s", inet_ntoa(nbr->id),
 409             (mac) ? prefix_mac2str((struct ethaddr *)mac, buf, sizeof(buf)) :
 410             "wildcard");
 411 }