pimd/pim_zlookup.c

   1 /*
   2  * PIM for Quagga
   3  * Copyright (C) 2008  Everton da Silva Marques
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; see the file COPYING; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  18  */
  19
  20 #include <zebra.h>
  21 #include "zebra/rib.h"
  22
  23 #include "log.h"
  24 #include "prefix.h"
  25 #include "zclient.h"
  26 #include "stream.h"
  27 #include "network.h"
  28 #include "thread.h"
  29 #include "prefix.h"
  30 #include "vty.h"
  31
  32 #include "pimd.h"
  33 #include "pim_iface.h"
  34 #include "pim_pim.h"
  35 #include "pim_str.h"
  36 #include "pim_oil.h"
  37 #include "pim_zlookup.h"
  38
  39 static struct zclient *zlookup = NULL;
  40
  41 static void zclient_lookup_sched(struct zclient *zlookup, int delay);
  42
  43 /* Connect to zebra for nexthop lookup. */
  44 static int zclient_lookup_connect(struct thread *t)
  45 {
  46         struct zclient *zlookup;
  47
  48         zlookup = THREAD_ARG(t);
  49
  50         if (zlookup->sock >= 0) {
  51                 return 0;
  52         }
  53
  54         if (zclient_socket_connect(zlookup) < 0) {
  55                 ++zlookup->fail;
  56                 zlog_warn("%s: failure connecting zclient socket: failures=%d",
  57                           __PRETTY_FUNCTION__, zlookup->fail);
  58         } else {
  59                 zlookup->fail = 0; /* reset counter on connection */
  60         }
  61
  62         if (zlookup->sock < 0) {
  63                 /* Since last connect failed, retry within 10 secs */
  64                 zclient_lookup_sched(zlookup, 10);
  65                 return -1;
  66         }
  67
  68         return 0;
  69 }
  70
  71 /* Schedule connection with delay. */
  72 static void zclient_lookup_sched(struct zclient *zlookup, int delay)
  73 {
  74         thread_add_timer(master, zclient_lookup_connect, zlookup, delay,
  75                          &zlookup->t_connect);
  76
  77         zlog_notice("%s: zclient lookup connection scheduled for %d seconds",
  78                     __PRETTY_FUNCTION__, delay);
  79 }
  80
  81 /* Schedule connection for now. */
  82 static void zclient_lookup_sched_now(struct zclient *zlookup)
  83 {
  84         thread_add_event(master, zclient_lookup_connect, zlookup, 0,
  85                          &zlookup->t_connect);
  86
  87         zlog_notice("%s: zclient lookup immediate connection scheduled",
  88                     __PRETTY_FUNCTION__);
  89 }
  90
  91 /* Schedule reconnection, if needed. */
  92 static void zclient_lookup_reconnect(struct zclient *zlookup)
  93 {
  94         if (zlookup->t_connect) {
  95                 return;
  96         }
  97
  98         zclient_lookup_sched_now(zlookup);
  99 }
 100
 101 static void zclient_lookup_failed(struct zclient *zlookup)
 102 {
 103         if (zlookup->sock >= 0) {
 104                 if (close(zlookup->sock)) {
 105                         zlog_warn("%s: closing fd=%d: errno=%d %s", __func__,
 106                                   zlookup->sock, errno, safe_strerror(errno));
 107                 }
 108                 zlookup->sock = -1;
 109         }
 110
 111         zclient_lookup_reconnect(zlookup);
 112 }
 113
 114 void zclient_lookup_free(void)
 115 {
 116         zclient_stop(zlookup);
 117         zclient_free(zlookup);
 118         zlookup = NULL;
 119 }
 120
 121 void zclient_lookup_new(void)
 122 {
 123         zlookup = zclient_new(master);
 124         if (!zlookup) {
 125                 zlog_err("%s: zclient_new() failure", __PRETTY_FUNCTION__);
 126                 return;
 127         }
 128
 129         zlookup->sock = -1;
 130         zlookup->t_connect = NULL;
 131
 132         zclient_lookup_sched_now(zlookup);
 133
 134         zlog_notice("%s: zclient lookup socket initialized",
 135                     __PRETTY_FUNCTION__);
 136 }
 137
 138 static int zclient_read_nexthop(struct pim_instance *pim,
 139                                 struct zclient *zlookup,
 140                                 struct pim_zlookup_nexthop nexthop_tab[],
 141                                 const int tab_size, struct in_addr addr)
 142 {
 143         int num_ifindex = 0;
 144         struct stream *s;
 145         uint16_t length;
 146         u_char marker;
 147         u_char version;
 148         vrf_id_t vrf_id;
 149         uint16_t command = 0;
 150         struct in_addr raddr;
 151         uint8_t distance;
 152         uint32_t metric;
 153         int nexthop_num;
 154         int i, err;
 155
 156         if (PIM_DEBUG_PIM_NHT_DETAIL) {
 157                 char addr_str[INET_ADDRSTRLEN];
 158                 pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
 159                 zlog_debug("%s: addr=%s(%s)", __PRETTY_FUNCTION__, addr_str,
 160                            pim->vrf->name);
 161         }
 162
 163         s = zlookup->ibuf;
 164
 165         while (command != ZEBRA_IPV4_NEXTHOP_LOOKUP_MRIB) {
 166                 stream_reset(s);
 167                 err = zclient_read_header(s, zlookup->sock, &length, &marker,
 168                                           &version, &vrf_id, &command);
 169                 if (err < 0) {
 170                         zlog_err("%s: zclient_read_header() failed",
 171                                  __PRETTY_FUNCTION__);
 172                         zclient_lookup_failed(zlookup);
 173                         return -1;
 174                 }
 175         }
 176
 177         raddr.s_addr = stream_get_ipv4(s);
 178
 179         if (raddr.s_addr != addr.s_addr) {
 180                 char addr_str[INET_ADDRSTRLEN];
 181                 char raddr_str[INET_ADDRSTRLEN];
 182                 pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
 183                 pim_inet4_dump("<raddr?>", raddr, raddr_str, sizeof(raddr_str));
 184                 zlog_warn("%s: address mismatch: addr=%s(%s) raddr=%s",
 185                           __PRETTY_FUNCTION__, addr_str, pim->vrf->name,
 186                           raddr_str);
 187                 /* warning only */
 188         }
 189
 190         distance = stream_getc(s);
 191         metric = stream_getl(s);
 192         nexthop_num = stream_getc(s);
 193
 194         if (nexthop_num < 1) {
 195                 if (PIM_DEBUG_PIM_NHT_DETAIL)
 196                         zlog_debug("%s: socket %d bad nexthop_num=%d", __func__,
 197                                    zlookup->sock, nexthop_num);
 198                 return -6;
 199         }
 200
 201         for (i = 0; i < nexthop_num; ++i) {
 202                 enum nexthop_types_t nexthop_type;
 203                 struct pim_neighbor *nbr;
 204                 struct prefix p;
 205
 206                 nexthop_type = stream_getc(s);
 207                 if (num_ifindex >= tab_size) {
 208                         char addr_str[INET_ADDRSTRLEN];
 209                         pim_inet4_dump("<addr?>", addr, addr_str,
 210                                        sizeof(addr_str));
 211                         zlog_warn(
 212                                 "%s: found too many nexthop ifindexes (%d > %d) for address %s(%s)",
 213                                 __PRETTY_FUNCTION__, (num_ifindex + 1),
 214                                 tab_size, addr_str, pim->vrf->name);
 215                         return num_ifindex;
 216                 }
 217                 switch (nexthop_type) {
 218                 case NEXTHOP_TYPE_IFINDEX:
 219                 case NEXTHOP_TYPE_IPV4_IFINDEX:
 220                 case NEXTHOP_TYPE_IPV4:
 221                         nexthop_tab[num_ifindex].nexthop_addr.family = AF_INET;
 222                         if (nexthop_type == NEXTHOP_TYPE_IPV4_IFINDEX
 223                             || nexthop_type == NEXTHOP_TYPE_IPV4) {
 224                                 nexthop_tab[num_ifindex]
 225                                         .nexthop_addr.u.prefix4.s_addr =
 226                                         stream_get_ipv4(s);
 227                         } else {
 228                                 nexthop_tab[num_ifindex]
 229                                         .nexthop_addr.u.prefix4.s_addr =
 230                                         PIM_NET_INADDR_ANY;
 231                         }
 232                         nexthop_tab[num_ifindex].ifindex = stream_getl(s);
 233                         nexthop_tab[num_ifindex].protocol_distance = distance;
 234                         nexthop_tab[num_ifindex].route_metric = metric;
 235                         ++num_ifindex;
 236                         break;
 237                 case NEXTHOP_TYPE_IPV6_IFINDEX:
 238                         nexthop_tab[num_ifindex].nexthop_addr.family = AF_INET6;
 239                         stream_get(&nexthop_tab[num_ifindex]
 240                                             .nexthop_addr.u.prefix6,
 241                                    s, sizeof(struct in6_addr));
 242                         nexthop_tab[num_ifindex].ifindex = stream_getl(s);
 243
 244                         p.family = AF_INET6;
 245                         p.prefixlen = IPV6_MAX_PREFIXLEN;
 246                         memcpy(&p.u.prefix6,
 247                                &nexthop_tab[num_ifindex].nexthop_addr.u.prefix6,
 248                                sizeof(struct in6_addr));
 249
 250                         /*
 251                          * If we are sending v6 secondary assume we receive v6
 252                          * secondary
 253                          */
 254                         if (pim->send_v6_secondary)
 255                                 nbr = pim_neighbor_find_by_secondary(
 256                                         if_lookup_by_index(
 257                                                 nexthop_tab[num_ifindex]
 258                                                         .ifindex,
 259                                                 vrf_id),
 260                                         &p);
 261                         else
 262                                 nbr = pim_neighbor_find_if(if_lookup_by_index(
 263                                         nexthop_tab[num_ifindex].ifindex,
 264                                         vrf_id));
 265                         if (nbr) {
 266                                 nexthop_tab[num_ifindex].nexthop_addr.family =
 267                                         AF_INET;
 268                                 nexthop_tab[num_ifindex]
 269                                         .nexthop_addr.u.prefix4 =
 270                                         nbr->source_addr;
 271                         }
 272                         ++num_ifindex;
 273                         break;
 274                 default:
 275                         /* do nothing */
 276                         {
 277                                 char addr_str[INET_ADDRSTRLEN];
 278                                 pim_inet4_dump("<addr?>", addr, addr_str,
 279                                                sizeof(addr_str));
 280                                 zlog_warn(
 281                                         "%s: found non-ifindex nexthop type=%d for address %s(%s)",
 282                                         __PRETTY_FUNCTION__, nexthop_type,
 283                                         addr_str, pim->vrf->name);
 284                         }
 285                         break;
 286                 }
 287         }
 288
 289         return num_ifindex;
 290 }
 291
 292 static int zclient_lookup_nexthop_once(struct pim_instance *pim,
 293                                        struct pim_zlookup_nexthop nexthop_tab[],
 294                                        const int tab_size, struct in_addr addr)
 295 {
 296         struct stream *s;
 297         int ret;
 298
 299         if (PIM_DEBUG_PIM_NHT_DETAIL) {
 300                 char addr_str[INET_ADDRSTRLEN];
 301                 pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
 302                 zlog_debug("%s: addr=%s(%s)", __PRETTY_FUNCTION__, addr_str,
 303                            pim->vrf->name);
 304         }
 305
 306         /* Check socket. */
 307         if (zlookup->sock < 0) {
 308                 zlog_err("%s: zclient lookup socket is not connected",
 309                          __PRETTY_FUNCTION__);
 310                 zclient_lookup_failed(zlookup);
 311                 return -1;
 312         }
 313
 314         if (pim->vrf->vrf_id == VRF_UNKNOWN) {
 315                 zlog_err(
 316                         "%s: VRF: %s does not fully exist yet, delaying lookup",
 317                         __PRETTY_FUNCTION__, pim->vrf->name);
 318                 return -1;
 319         }
 320
 321         s = zlookup->obuf;
 322         stream_reset(s);
 323         zclient_create_header(s, ZEBRA_IPV4_NEXTHOP_LOOKUP_MRIB, pim->vrf_id);
 324         stream_put_in_addr(s, &addr);
 325         stream_putw_at(s, 0, stream_get_endp(s));
 326
 327         ret = writen(zlookup->sock, s->data, stream_get_endp(s));
 328         if (ret < 0) {
 329                 zlog_err(
 330                         "%s: writen() failure: %d writing to zclient lookup socket",
 331                         __PRETTY_FUNCTION__, errno);
 332                 zclient_lookup_failed(zlookup);
 333                 return -2;
 334         }
 335         if (ret == 0) {
 336                 zlog_err("%s: connection closed on zclient lookup socket",
 337                          __PRETTY_FUNCTION__);
 338                 zclient_lookup_failed(zlookup);
 339                 return -3;
 340         }
 341
 342         return zclient_read_nexthop(pim, zlookup, nexthop_tab, tab_size, addr);
 343 }
 344
 345 int zclient_lookup_nexthop(struct pim_instance *pim,
 346                            struct pim_zlookup_nexthop nexthop_tab[],
 347                            const int tab_size, struct in_addr addr,
 348                            int max_lookup)
 349 {
 350         int lookup;
 351         uint32_t route_metric = 0xFFFFFFFF;
 352         uint8_t protocol_distance = 0xFF;
 353
 354         qpim_nexthop_lookups++;
 355
 356         for (lookup = 0; lookup < max_lookup; ++lookup) {
 357                 int num_ifindex;
 358                 int first_ifindex;
 359                 struct prefix nexthop_addr;
 360
 361                 num_ifindex = zclient_lookup_nexthop_once(pim, nexthop_tab,
 362                                                           tab_size, addr);
 363                 if (num_ifindex < 1) {
 364                         if (PIM_DEBUG_PIM_NHT) {
 365                                 char addr_str[INET_ADDRSTRLEN];
 366                                 pim_inet4_dump("<addr?>", addr, addr_str,
 367                                                sizeof(addr_str));
 368                                 zlog_debug(
 369                                         "%s: lookup=%d/%d: could not find nexthop ifindex for address %s(%s)",
 370                                         __PRETTY_FUNCTION__, lookup, max_lookup,
 371                                         addr_str, pim->vrf->name);
 372                         }
 373                         return -1;
 374                 }
 375
 376                 if (lookup < 1) {
 377                         /* this is the non-recursive lookup - save original
 378                          * metric/distance */
 379                         route_metric = nexthop_tab[0].route_metric;
 380                         protocol_distance = nexthop_tab[0].protocol_distance;
 381                 }
 382
 383                 /*
 384                  * FIXME: Non-recursive nexthop ensured only for first ifindex.
 385                  * However, recursive route lookup should really be fixed in
 386                  * zebra daemon.
 387                  * See also TODO T24.
 388                  *
 389                  * So Zebra for NEXTHOP_TYPE_IPV4 returns the ifindex now since
 390                  * it was being stored.  This Doesn't solve all cases of
 391                  * recursive lookup but for the most common types it does.
 392                  */
 393                 first_ifindex = nexthop_tab[0].ifindex;
 394                 nexthop_addr = nexthop_tab[0].nexthop_addr;
 395                 if (first_ifindex > 0) {
 396                         /* found: first ifindex is non-recursive nexthop */
 397
 398                         if (lookup > 0) {
 399                                 /* Report non-recursive success after first
 400                                  * lookup */
 401                                 if (PIM_DEBUG_PIM_NHT) {
 402                                         char addr_str[INET_ADDRSTRLEN];
 403                                         pim_inet4_dump("<addr?>", addr,
 404                                                        addr_str,
 405                                                        sizeof(addr_str));
 406                                         zlog_debug(
 407                                                 "%s: lookup=%d/%d: found non-recursive ifindex=%d for address %s(%s) dist=%d met=%d",
 408                                                 __PRETTY_FUNCTION__, lookup,
 409                                                 max_lookup, first_ifindex,
 410                                                 addr_str, pim->vrf->name,
 411                                                 nexthop_tab[0]
 412                                                         .protocol_distance,
 413                                                 nexthop_tab[0].route_metric);
 414                                 }
 415
 416                                 /* use last address as nexthop address */
 417                                 nexthop_tab[0].nexthop_addr.u.prefix4 = addr;
 418
 419                                 /* report original route metric/distance */
 420                                 nexthop_tab[0].route_metric = route_metric;
 421                                 nexthop_tab[0].protocol_distance =
 422                                         protocol_distance;
 423                         }
 424
 425                         return num_ifindex;
 426                 }
 427
 428                 if (PIM_DEBUG_PIM_NHT) {
 429                         char addr_str[INET_ADDRSTRLEN];
 430                         char nexthop_str[PREFIX_STRLEN];
 431                         pim_inet4_dump("<addr?>", addr, addr_str,
 432                                        sizeof(addr_str));
 433                         pim_addr_dump("<nexthop?>", &nexthop_addr, nexthop_str,
 434                                       sizeof(nexthop_str));
 435                         zlog_debug(
 436                                 "%s: lookup=%d/%d: zebra returned recursive nexthop %s for address %s(%s) dist=%d met=%d",
 437                                 __PRETTY_FUNCTION__, lookup, max_lookup,
 438                                 nexthop_str, addr_str, pim->vrf->name,
 439                                 nexthop_tab[0].protocol_distance,
 440                                 nexthop_tab[0].route_metric);
 441                 }
 442
 443                 addr =
 444                         nexthop_addr.u.prefix4; /* use nexthop addr for
 445                                                    recursive lookup */
 446
 447         } /* for (max_lookup) */
 448
 449         if (PIM_DEBUG_PIM_NHT) {
 450                 char addr_str[INET_ADDRSTRLEN];
 451                 pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
 452                 zlog_warn(
 453                         "%s: lookup=%d/%d: failure searching recursive nexthop ifindex for address %s(%s)",
 454                         __PRETTY_FUNCTION__, lookup, max_lookup, addr_str,
 455                         pim->vrf->name);
 456         }
 457
 458         return -2;
 459 }
 460
 461 void pim_zlookup_show_ip_multicast(struct vty *vty)
 462 {
 463         vty_out(vty, "Zclient lookup socket: ");
 464         if (zlookup) {
 465                 vty_out(vty, "%d failures=%d\n", zlookup->sock, zlookup->fail);
 466         } else {
 467                 vty_out(vty, "<null zclient>\n");
 468         }
 469 }
 470
 471 int pim_zlookup_sg_statistics(struct channel_oil *c_oil)
 472 {
 473         struct stream *s = zlookup->obuf;
 474         uint16_t command = 0;
 475         unsigned long long lastused;
 476         struct prefix_sg sg;
 477         int count = 0;
 478         int ret;
 479         struct interface *ifp =
 480                 pim_if_find_by_vif_index(c_oil->pim, c_oil->oil.mfcc_parent);
 481
 482         if (PIM_DEBUG_ZEBRA) {
 483                 struct prefix_sg more;
 484
 485                 more.src = c_oil->oil.mfcc_origin;
 486                 more.grp = c_oil->oil.mfcc_mcastgrp;
 487                 zlog_debug(
 488                         "Sending Request for New Channel Oil Information(%s) VIIF %d(%s)",
 489                         pim_str_sg_dump(&more), c_oil->oil.mfcc_parent,
 490                         c_oil->pim->vrf->name);
 491         }
 492
 493         if (!ifp)
 494                 return -1;
 495
 496         stream_reset(s);
 497         zclient_create_header(s, ZEBRA_IPMR_ROUTE_STATS, c_oil->pim->vrf_id);
 498         stream_put_in_addr(s, &c_oil->oil.mfcc_origin);
 499         stream_put_in_addr(s, &c_oil->oil.mfcc_mcastgrp);
 500         stream_putl(s, ifp->ifindex);
 501         stream_putw_at(s, 0, stream_get_endp(s));
 502
 503         count = stream_get_endp(s);
 504         ret = writen(zlookup->sock, s->data, count);
 505         if (ret <= 0) {
 506                 zlog_err(
 507                         "%s: writen() failure: %d writing to zclient lookup socket",
 508                         __PRETTY_FUNCTION__, errno);
 509                 return -1;
 510         }
 511
 512         s = zlookup->ibuf;
 513
 514         while (command != ZEBRA_IPMR_ROUTE_STATS) {
 515                 int err;
 516                 uint16_t length = 0;
 517                 vrf_id_t vrf_id;
 518                 u_char marker;
 519                 u_char version;
 520
 521                 stream_reset(s);
 522                 err = zclient_read_header(s, zlookup->sock, &length, &marker,
 523                                           &version, &vrf_id, &command);
 524                 if (err < 0) {
 525                         zlog_err("%s: zclient_read_header() failed",
 526                                  __PRETTY_FUNCTION__);
 527                         zclient_lookup_failed(zlookup);
 528                         return -1;
 529                 }
 530         }
 531
 532         sg.src.s_addr = stream_get_ipv4(s);
 533         sg.grp.s_addr = stream_get_ipv4(s);
 534         if (sg.src.s_addr != c_oil->oil.mfcc_origin.s_addr
 535             || sg.grp.s_addr != c_oil->oil.mfcc_mcastgrp.s_addr) {
 536                 if (PIM_DEBUG_ZEBRA) {
 537                         struct prefix_sg more;
 538
 539                         more.src = c_oil->oil.mfcc_origin;
 540                         more.grp = c_oil->oil.mfcc_mcastgrp;
 541                         zlog_err(
 542                                 "%s: Received wrong %s(%s) information requested",
 543                                 __PRETTY_FUNCTION__, pim_str_sg_dump(&more),
 544                                 c_oil->pim->vrf->name);
 545                 }
 546                 zclient_lookup_failed(zlookup);
 547                 return -3;
 548         }
 549
 550         stream_get(&lastused, s, sizeof(lastused));
 551         stream_getl(s);
 552
 553         c_oil->cc.lastused = lastused;
 554
 555         return 0;
 556 }