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                 /* no errors - update per neighbor message counters */
 109                 switch (msg_type) {
 110                 case MSG_TYPE_ADDR:
 111                         nbr->stats.addr_sent++;
 112                         break;
 113                 case MSG_TYPE_ADDRWITHDRAW:
 114                         nbr->stats.addrwdraw_sent++;
 115                         break;
 116                 default:
 117                         break;
 118                 }
 119         }
 120
 121         nbr_fsm(nbr, NBR_EVT_PDU_SENT);
 122 }
 123
 124 void
 125 send_address_single(struct nbr *nbr, struct if_addr *if_addr, int withdraw)
 126 {
 127         struct if_addr_head      addr_list;
 128
 129         LIST_INIT(&addr_list);
 130         address_list_add(&addr_list, if_addr);
 131         send_address(nbr, if_addr->af, &addr_list, 1, withdraw);
 132 }
 133
 134 void
 135 send_address_all(struct nbr *nbr, int af)
 136 {
 137         struct if_addr_head      addr_list;
 138         struct if_addr          *if_addr;
 139         unsigned int             addr_count = 0;
 140
 141         LIST_INIT(&addr_list);
 142         LIST_FOREACH(if_addr, &global.addr_list, entry) {
 143                 if (if_addr->af != af)
 144                         continue;
 145
 146                 address_list_add(&addr_list, if_addr);
 147                 addr_count++;
 148         }
 149
 150         send_address(nbr, af, &addr_list, addr_count, 0);
 151 }
 152
 153 void
 154 send_mac_withdrawal(struct nbr *nbr, struct map *fec, uint8_t *mac)
 155 {
 156         struct ibuf     *buf;
 157         uint16_t         size;
 158         int              err;
 159
 160         size = LDP_HDR_SIZE + LDP_MSG_SIZE + ADDR_LIST_SIZE + len_fec_tlv(fec) +
 161             TLV_HDR_SIZE;
 162         if (mac)
 163                 size += ETH_ALEN;
 164
 165         if ((buf = ibuf_open(size)) == NULL)
 166                 fatal(__func__);
 167
 168         err = gen_ldp_hdr(buf, size);
 169         size -= LDP_HDR_SIZE;
 170         err |= gen_msg_hdr(buf, MSG_TYPE_ADDRWITHDRAW, size);
 171         size -= LDP_MSG_SIZE;
 172         err |= gen_address_list_tlv(buf, AF_INET, NULL, 0);
 173         err |= gen_fec_tlv(buf, fec);
 174         err |= gen_mac_list_tlv(buf, mac);
 175         if (err) {
 176                 ibuf_free(buf);
 177                 return;
 178         }
 179
 180         log_msg_mac_withdrawal(1, nbr, mac);
 181
 182         evbuf_enqueue(&nbr->tcp->wbuf, buf);
 183
 184         nbr_fsm(nbr, NBR_EVT_PDU_SENT);
 185 }
 186
 187 int
 188 recv_address(struct nbr *nbr, char *buf, uint16_t len)
 189 {
 190         struct ldp_msg          msg;
 191         uint16_t                msg_type;
 192         enum imsg_type          type;
 193         struct address_list_tlv alt;
 194         uint16_t                alt_len;
 195         uint16_t                alt_family;
 196         struct lde_addr         lde_addr;
 197
 198         memcpy(&msg, buf, sizeof(msg));
 199         msg_type = ntohs(msg.type);
 200         switch (msg_type) {
 201         case MSG_TYPE_ADDR:
 202                 type = IMSG_ADDRESS_ADD;
 203                 break;
 204         case MSG_TYPE_ADDRWITHDRAW:
 205                 type = IMSG_ADDRESS_DEL;
 206                 break;
 207         default:
 208                 fatalx("recv_address: unexpected msg type");
 209         }
 210         buf += LDP_MSG_SIZE;
 211         len -= LDP_MSG_SIZE;
 212
 213         /* Address List TLV */
 214         if (len < ADDR_LIST_SIZE) {
 215                 session_shutdown(nbr, S_BAD_MSG_LEN, msg.id, msg.type);
 216                 return (-1);
 217         }
 218         memcpy(&alt, buf, sizeof(alt));
 219         alt_len = ntohs(alt.length);
 220         alt_family = ntohs(alt.family);
 221         if (alt_len > len - TLV_HDR_SIZE) {
 222                 session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, msg.type);
 223                 return (-1);
 224         }
 225         if (ntohs(alt.type) != TLV_TYPE_ADDRLIST) {
 226                 send_notification(nbr->tcp, S_MISS_MSG, msg.id, msg.type);
 227                 return (-1);
 228         }
 229         switch (alt_family) {
 230         case AF_IPV4:
 231                 if (!nbr->v4_enabled)
 232                         /* just ignore the message */
 233                         return (0);
 234                 break;
 235         case AF_IPV6:
 236                 if (!nbr->v6_enabled)
 237                         /* just ignore the message */
 238                         return (0);
 239                 break;
 240         default:
 241                 send_notification(nbr->tcp, S_UNSUP_ADDR, msg.id, msg.type);
 242                 return (-1);
 243         }
 244         alt_len -= sizeof(alt.family);
 245         buf += sizeof(alt);
 246         len -= sizeof(alt);
 247
 248         /* Process all received addresses */
 249         while (alt_len > 0) {
 250                 switch (alt_family) {
 251                 case AF_IPV4:
 252                         if (alt_len < sizeof(struct in_addr)) {
 253                                 session_shutdown(nbr, S_BAD_TLV_LEN, msg.id,
 254                                     msg.type);
 255                                 return (-1);
 256                         }
 257
 258                         memset(&lde_addr, 0, sizeof(lde_addr));
 259                         lde_addr.af = AF_INET;
 260                         memcpy(&lde_addr.addr, buf, sizeof(struct in_addr));
 261
 262                         buf += sizeof(struct in_addr);
 263                         len -= sizeof(struct in_addr);
 264                         alt_len -= sizeof(struct in_addr);
 265                         break;
 266                 case AF_IPV6:
 267                         if (alt_len < sizeof(struct in6_addr)) {
 268                                 session_shutdown(nbr, S_BAD_TLV_LEN, msg.id,
 269                                     msg.type);
 270                                 return (-1);
 271                         }
 272
 273                         memset(&lde_addr, 0, sizeof(lde_addr));
 274                         lde_addr.af = AF_INET6;
 275                         memcpy(&lde_addr.addr, buf, sizeof(struct in6_addr));
 276
 277                         buf += sizeof(struct in6_addr);
 278                         len -= sizeof(struct in6_addr);
 279                         alt_len -= sizeof(struct in6_addr);
 280                         break;
 281                 default:
 282                         fatalx("recv_address: unknown af");
 283                 }
 284
 285                 log_msg_address(0, msg_type, nbr, lde_addr.af, &lde_addr.addr);
 286
 287                 ldpe_imsg_compose_lde(type, nbr->peerid, 0, &lde_addr,
 288                     sizeof(lde_addr));
 289         }
 290
 291         /* Optional Parameters */
 292         while (len > 0) {
 293                 struct tlv      tlv;
 294                 uint16_t        tlv_type;
 295                 uint16_t        tlv_len;
 296
 297                 if (len < sizeof(tlv)) {
 298                         session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, msg.type);
 299                         return (-1);
 300                 }
 301
 302                 memcpy(&tlv, buf, TLV_HDR_SIZE);
 303                 tlv_type = ntohs(tlv.type);
 304                 tlv_len = ntohs(tlv.length);
 305                 if (tlv_len + TLV_HDR_SIZE > len) {
 306                         session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, msg.type);
 307                         return (-1);
 308                 }
 309                 buf += TLV_HDR_SIZE;
 310                 len -= TLV_HDR_SIZE;
 311
 312                 switch (tlv_type) {
 313                 default:
 314                         if (!(ntohs(tlv.type) & UNKNOWN_FLAG))
 315                                 send_notification_rtlvs(nbr, S_UNKNOWN_TLV,
 316                                     msg.id, msg.type, tlv_type, tlv_len, buf);
 317                         /* ignore unknown tlv */
 318                         break;
 319                 }
 320                 buf += tlv_len;
 321                 len -= tlv_len;
 322         }
 323
 324         return (0);
 325 }
 326
 327 static int
 328 gen_address_list_tlv(struct ibuf *buf, int af, struct if_addr_head *addr_list,
 329     unsigned int tlv_addr_count)
 330 {
 331         struct address_list_tlv  alt;
 332         uint16_t                 addr_size;
 333         struct if_addr          *if_addr;
 334         int                      err = 0;
 335
 336         memset(&alt, 0, sizeof(alt));
 337         alt.type = htons(TLV_TYPE_ADDRLIST);
 338
 339         switch (af) {
 340         case AF_INET:
 341                 alt.family = htons(AF_IPV4);
 342                 addr_size = sizeof(struct in_addr);
 343                 break;
 344         case AF_INET6:
 345                 alt.family = htons(AF_IPV6);
 346                 addr_size = sizeof(struct in6_addr);
 347                 break;
 348         default:
 349                 fatalx("gen_address_list_tlv: unknown af");
 350         }
 351         alt.length = htons(sizeof(alt.family) + addr_size * tlv_addr_count);
 352
 353         err |= ibuf_add(buf, &alt, sizeof(alt));
 354         if (addr_list == NULL)
 355                 return (err);
 356
 357         LIST_FOREACH(if_addr, addr_list, entry) {
 358                 err |= ibuf_add(buf, &if_addr->addr, addr_size);
 359                 if (--tlv_addr_count == 0)
 360                         break;
 361         }
 362
 363         return (err);
 364 }
 365
 366 static int
 367 gen_mac_list_tlv(struct ibuf *buf, uint8_t *mac)
 368 {
 369         struct tlv       tlv;
 370         int              err;
 371
 372         memset(&tlv, 0, sizeof(tlv));
 373         tlv.type = htons(TLV_TYPE_MAC_LIST);
 374         if (mac)
 375                 tlv.length = htons(ETH_ALEN);
 376         err = ibuf_add(buf, &tlv, sizeof(tlv));
 377         if (mac)
 378                 err |= ibuf_add(buf, mac, ETH_ALEN);
 379
 380         return (err);
 381 }
 382
 383 static void
 384 address_list_add(struct if_addr_head *addr_list, struct if_addr *if_addr)
 385 {
 386         struct if_addr          *new;
 387
 388         new = malloc(sizeof(*new));
 389         if (new == NULL)
 390                 fatal(__func__);
 391         *new = *if_addr;
 392
 393         LIST_INSERT_HEAD(addr_list, new, entry);
 394 }
 395
 396 static void
 397 address_list_clr(struct if_addr_head *addr_list)
 398 {
 399         struct if_addr          *if_addr;
 400
 401         while ((if_addr = LIST_FIRST(addr_list)) != NULL) {
 402                 LIST_REMOVE(if_addr, entry);
 403                 free(if_addr);
 404         }
 405 }
 406
 407 static void
 408 log_msg_address(int out, uint16_t msg_type, struct nbr *nbr, int af,
 409     union ldpd_addr *addr)
 410 {
 411         debug_msg(out, "%s: lsr-id %s, address %s", msg_name(msg_type),
 412             inet_ntoa(nbr->id), log_addr(af, addr));
 413 }
 414
 415 static void
 416 log_msg_mac_withdrawal(int out, struct nbr *nbr, uint8_t *mac)
 417 {
 418         char buf[ETHER_ADDR_STRLEN];
 419
 420         debug_msg(out, "mac withdrawal: lsr-id %s, mac %s", inet_ntoa(nbr->id),
 421             (mac) ? prefix_mac2str((struct ethaddr *)mac, buf, sizeof(buf)) :
 422             "wildcard");
 423 }