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_notify(master, &zclient_options_default);
 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         zlookup->privs = &pimd_privs;
 132
 133         zclient_lookup_sched_now(zlookup);
 134
 135         zlog_notice("%s: zclient lookup socket initialized",
 136                     __PRETTY_FUNCTION__);
 137 }
 138
 139 static int zclient_read_nexthop(struct pim_instance *pim,
 140                                 struct zclient *zlookup,
 141                                 struct pim_zlookup_nexthop nexthop_tab[],
 142                                 const int tab_size, struct in_addr addr)
 143 {
 144         int num_ifindex = 0;
 145         struct stream *s;
 146         uint16_t length;
 147         uint8_t marker;
 148         uint8_t version;
 149         vrf_id_t vrf_id;
 150         uint16_t command = 0;
 151         struct in_addr raddr;
 152         uint8_t distance;
 153         uint32_t metric;
 154         int nexthop_num;
 155         int i, err;
 156
 157         if (PIM_DEBUG_PIM_NHT_DETAIL) {
 158                 char addr_str[INET_ADDRSTRLEN];
 159                 pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
 160                 zlog_debug("%s: addr=%s(%s)", __PRETTY_FUNCTION__, addr_str,
 161                            pim->vrf->name);
 162         }
 163
 164         s = zlookup->ibuf;
 165
 166         while (command != ZEBRA_IPV4_NEXTHOP_LOOKUP_MRIB) {
 167                 stream_reset(s);
 168                 err = zclient_read_header(s, zlookup->sock, &length, &marker,
 169                                           &version, &vrf_id, &command);
 170                 if (err < 0) {
 171                         zlog_err("%s: zclient_read_header() failed",
 172                                  __PRETTY_FUNCTION__);
 173                         zclient_lookup_failed(zlookup);
 174                         return -1;
 175                 }
 176         }
 177
 178         raddr.s_addr = stream_get_ipv4(s);
 179
 180         if (raddr.s_addr != addr.s_addr) {
 181                 char addr_str[INET_ADDRSTRLEN];
 182                 char raddr_str[INET_ADDRSTRLEN];
 183                 pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
 184                 pim_inet4_dump("<raddr?>", raddr, raddr_str, sizeof(raddr_str));
 185                 zlog_warn("%s: address mismatch: addr=%s(%s) raddr=%s",
 186                           __PRETTY_FUNCTION__, addr_str, pim->vrf->name,
 187                           raddr_str);
 188                 /* warning only */
 189         }
 190
 191         distance = stream_getc(s);
 192         metric = stream_getl(s);
 193         nexthop_num = stream_getc(s);
 194
 195         if (nexthop_num < 1) {
 196                 if (PIM_DEBUG_PIM_NHT_DETAIL)
 197                         zlog_debug("%s: socket %d bad nexthop_num=%d", __func__,
 198                                    zlookup->sock, nexthop_num);
 199                 return -6;
 200         }
 201
 202         for (i = 0; i < nexthop_num; ++i) {
 203                 enum nexthop_types_t nexthop_type;
 204                 struct pim_neighbor *nbr;
 205                 struct prefix p;
 206
 207                 nexthop_type = stream_getc(s);
 208                 if (num_ifindex >= tab_size) {
 209                         char addr_str[INET_ADDRSTRLEN];
 210                         pim_inet4_dump("<addr?>", addr, addr_str,
 211                                        sizeof(addr_str));
 212                         zlog_warn(
 213                                 "%s: found too many nexthop ifindexes (%d > %d) for address %s(%s)",
 214                                 __PRETTY_FUNCTION__, (num_ifindex + 1),
 215                                 tab_size, addr_str, pim->vrf->name);
 216                         return num_ifindex;
 217                 }
 218                 nexthop_tab[num_ifindex].protocol_distance = distance;
 219                 nexthop_tab[num_ifindex].route_metric = metric;
 220                 switch (nexthop_type) {
 221                 case NEXTHOP_TYPE_IFINDEX:
 222                         nexthop_tab[num_ifindex].ifindex = stream_getl(s);
 223                         /*
 224                          * Connected route (i.e. no nexthop), use
 225                          * address passed in as PIM nexthop.  This will
 226                          * allow us to work in cases where we are
 227                          * trying to find a route for this box.
 228                          */
 229                         nexthop_tab[num_ifindex].nexthop_addr.family = AF_INET;
 230                         nexthop_tab[num_ifindex].nexthop_addr.prefixlen =
 231                                 IPV4_MAX_BITLEN;
 232                         nexthop_tab[num_ifindex].nexthop_addr.u.prefix4 =
 233                                 addr;
 234                         ++num_ifindex;
 235                         break;
 236                 case NEXTHOP_TYPE_IPV4_IFINDEX:
 237                 case NEXTHOP_TYPE_IPV4:
 238                         nexthop_tab[num_ifindex].nexthop_addr.family = AF_INET;
 239                         nexthop_tab[num_ifindex].nexthop_addr.u.prefix4.s_addr =
 240                                 stream_get_ipv4(s);
 241                         nexthop_tab[num_ifindex].ifindex = stream_getl(s);
 242                         ++num_ifindex;
 243                         break;
 244                 case NEXTHOP_TYPE_IPV6_IFINDEX:
 245                         nexthop_tab[num_ifindex].nexthop_addr.family = AF_INET6;
 246                         stream_get(&nexthop_tab[num_ifindex]
 247                                             .nexthop_addr.u.prefix6,
 248                                    s, sizeof(struct in6_addr));
 249                         nexthop_tab[num_ifindex].ifindex = stream_getl(s);
 250
 251                         p.family = AF_INET6;
 252                         p.prefixlen = IPV6_MAX_PREFIXLEN;
 253                         memcpy(&p.u.prefix6,
 254                                &nexthop_tab[num_ifindex].nexthop_addr.u.prefix6,
 255                                sizeof(struct in6_addr));
 256
 257                         /*
 258                          * If we are sending v6 secondary assume we receive v6
 259                          * secondary
 260                          */
 261                         if (pim->send_v6_secondary)
 262                                 nbr = pim_neighbor_find_by_secondary(
 263                                         if_lookup_by_index(
 264                                                 nexthop_tab[num_ifindex]
 265                                                         .ifindex,
 266                                                 vrf_id),
 267                                         &p);
 268                         else
 269                                 nbr = pim_neighbor_find_if(if_lookup_by_index(
 270                                         nexthop_tab[num_ifindex].ifindex,
 271                                         vrf_id));
 272                         if (nbr) {
 273                                 nexthop_tab[num_ifindex].nexthop_addr.family =
 274                                         AF_INET;
 275                                 nexthop_tab[num_ifindex]
 276                                         .nexthop_addr.u.prefix4 =
 277                                         nbr->source_addr;
 278                         }
 279                         ++num_ifindex;
 280                         break;
 281                 default:
 282                         /* do nothing */
 283                         {
 284                                 char addr_str[INET_ADDRSTRLEN];
 285                                 pim_inet4_dump("<addr?>", addr, addr_str,
 286                                                sizeof(addr_str));
 287                                 zlog_warn(
 288                                         "%s: found non-ifindex nexthop type=%d for address %s(%s)",
 289                                         __PRETTY_FUNCTION__, nexthop_type,
 290                                         addr_str, pim->vrf->name);
 291                         }
 292                         break;
 293                 }
 294         }
 295
 296         return num_ifindex;
 297 }
 298
 299 static int zclient_lookup_nexthop_once(struct pim_instance *pim,
 300                                        struct pim_zlookup_nexthop nexthop_tab[],
 301                                        const int tab_size, struct in_addr addr)
 302 {
 303         struct stream *s;
 304         int ret;
 305
 306         if (PIM_DEBUG_PIM_NHT_DETAIL) {
 307                 char addr_str[INET_ADDRSTRLEN];
 308                 pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
 309                 zlog_debug("%s: addr=%s(%s)", __PRETTY_FUNCTION__, addr_str,
 310                            pim->vrf->name);
 311         }
 312
 313         /* Check socket. */
 314         if (zlookup->sock < 0) {
 315                 zlog_err("%s: zclient lookup socket is not connected",
 316                          __PRETTY_FUNCTION__);
 317                 zclient_lookup_failed(zlookup);
 318                 return -1;
 319         }
 320
 321         if (pim->vrf->vrf_id == VRF_UNKNOWN) {
 322                 zlog_err(
 323                         "%s: VRF: %s does not fully exist yet, delaying lookup",
 324                         __PRETTY_FUNCTION__, pim->vrf->name);
 325                 return -1;
 326         }
 327
 328         s = zlookup->obuf;
 329         stream_reset(s);
 330         zclient_create_header(s, ZEBRA_IPV4_NEXTHOP_LOOKUP_MRIB, pim->vrf_id);
 331         stream_put_in_addr(s, &addr);
 332         stream_putw_at(s, 0, stream_get_endp(s));
 333
 334         ret = writen(zlookup->sock, s->data, stream_get_endp(s));
 335         if (ret < 0) {
 336                 zlog_err(
 337                         "%s: writen() failure: %d writing to zclient lookup socket",
 338                         __PRETTY_FUNCTION__, errno);
 339                 zclient_lookup_failed(zlookup);
 340                 return -2;
 341         }
 342         if (ret == 0) {
 343                 zlog_err("%s: connection closed on zclient lookup socket",
 344                          __PRETTY_FUNCTION__);
 345                 zclient_lookup_failed(zlookup);
 346                 return -3;
 347         }
 348
 349         return zclient_read_nexthop(pim, zlookup, nexthop_tab, tab_size, addr);
 350 }
 351
 352 int zclient_lookup_nexthop(struct pim_instance *pim,
 353                            struct pim_zlookup_nexthop nexthop_tab[],
 354                            const int tab_size, struct in_addr addr,
 355                            int max_lookup)
 356 {
 357         int lookup;
 358         uint32_t route_metric = 0xFFFFFFFF;
 359         uint8_t protocol_distance = 0xFF;
 360
 361         pim->nexthop_lookups++;
 362
 363         for (lookup = 0; lookup < max_lookup; ++lookup) {
 364                 int num_ifindex;
 365                 int first_ifindex;
 366                 struct prefix nexthop_addr;
 367
 368                 num_ifindex = zclient_lookup_nexthop_once(pim, nexthop_tab,
 369                                                           tab_size, addr);
 370                 if (num_ifindex < 1) {
 371                         if (PIM_DEBUG_PIM_NHT) {
 372                                 char addr_str[INET_ADDRSTRLEN];
 373                                 pim_inet4_dump("<addr?>", addr, addr_str,
 374                                                sizeof(addr_str));
 375                                 zlog_debug(
 376                                         "%s: lookup=%d/%d: could not find nexthop ifindex for address %s(%s)",
 377                                         __PRETTY_FUNCTION__, lookup, max_lookup,
 378                                         addr_str, pim->vrf->name);
 379                         }
 380                         return -1;
 381                 }
 382
 383                 if (lookup < 1) {
 384                         /* this is the non-recursive lookup - save original
 385                          * metric/distance */
 386                         route_metric = nexthop_tab[0].route_metric;
 387                         protocol_distance = nexthop_tab[0].protocol_distance;
 388                 }
 389
 390                 /*
 391                  * FIXME: Non-recursive nexthop ensured only for first ifindex.
 392                  * However, recursive route lookup should really be fixed in
 393                  * zebra daemon.
 394                  * See also TODO T24.
 395                  *
 396                  * So Zebra for NEXTHOP_TYPE_IPV4 returns the ifindex now since
 397                  * it was being stored.  This Doesn't solve all cases of
 398                  * recursive lookup but for the most common types it does.
 399                  */
 400                 first_ifindex = nexthop_tab[0].ifindex;
 401                 nexthop_addr = nexthop_tab[0].nexthop_addr;
 402                 if (first_ifindex > 0) {
 403                         /* found: first ifindex is non-recursive nexthop */
 404
 405                         if (lookup > 0) {
 406                                 /* Report non-recursive success after first
 407                                  * lookup */
 408                                 if (PIM_DEBUG_PIM_NHT) {
 409                                         char addr_str[INET_ADDRSTRLEN];
 410                                         pim_inet4_dump("<addr?>", addr,
 411                                                        addr_str,
 412                                                        sizeof(addr_str));
 413                                         zlog_debug(
 414                                                 "%s: lookup=%d/%d: found non-recursive ifindex=%d for address %s(%s) dist=%d met=%d",
 415                                                 __PRETTY_FUNCTION__, lookup,
 416                                                 max_lookup, first_ifindex,
 417                                                 addr_str, pim->vrf->name,
 418                                                 nexthop_tab[0]
 419                                                         .protocol_distance,
 420                                                 nexthop_tab[0].route_metric);
 421                                 }
 422
 423                                 /* use last address as nexthop address */
 424                                 nexthop_tab[0].nexthop_addr.u.prefix4 = addr;
 425
 426                                 /* report original route metric/distance */
 427                                 nexthop_tab[0].route_metric = route_metric;
 428                                 nexthop_tab[0].protocol_distance =
 429                                         protocol_distance;
 430                         }
 431
 432                         return num_ifindex;
 433                 }
 434
 435                 if (PIM_DEBUG_PIM_NHT) {
 436                         char addr_str[INET_ADDRSTRLEN];
 437                         char nexthop_str[PREFIX_STRLEN];
 438                         pim_inet4_dump("<addr?>", addr, addr_str,
 439                                        sizeof(addr_str));
 440                         pim_addr_dump("<nexthop?>", &nexthop_addr, nexthop_str,
 441                                       sizeof(nexthop_str));
 442                         zlog_debug(
 443                                 "%s: lookup=%d/%d: zebra returned recursive nexthop %s for address %s(%s) dist=%d met=%d",
 444                                 __PRETTY_FUNCTION__, lookup, max_lookup,
 445                                 nexthop_str, addr_str, pim->vrf->name,
 446                                 nexthop_tab[0].protocol_distance,
 447                                 nexthop_tab[0].route_metric);
 448                 }
 449
 450                 addr = nexthop_addr.u.prefix4; /* use nexthop addr for
 451                                                   recursive lookup */
 452
 453         } /* for (max_lookup) */
 454
 455         if (PIM_DEBUG_PIM_NHT) {
 456                 char addr_str[INET_ADDRSTRLEN];
 457                 pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
 458                 zlog_warn(
 459                         "%s: lookup=%d/%d: failure searching recursive nexthop ifindex for address %s(%s)",
 460                         __PRETTY_FUNCTION__, lookup, max_lookup, addr_str,
 461                         pim->vrf->name);
 462         }
 463
 464         return -2;
 465 }
 466
 467 void pim_zlookup_show_ip_multicast(struct vty *vty)
 468 {
 469         vty_out(vty, "Zclient lookup socket: ");
 470         if (zlookup) {
 471                 vty_out(vty, "%d failures=%d\n", zlookup->sock, zlookup->fail);
 472         } else {
 473                 vty_out(vty, "<null zclient>\n");
 474         }
 475 }
 476
 477 int pim_zlookup_sg_statistics(struct channel_oil *c_oil)
 478 {
 479         struct stream *s = zlookup->obuf;
 480         uint16_t command = 0;
 481         unsigned long long lastused;
 482         struct prefix_sg sg;
 483         int count = 0;
 484         int ret;
 485         struct interface *ifp =
 486                 pim_if_find_by_vif_index(c_oil->pim, c_oil->oil.mfcc_parent);
 487
 488         if (PIM_DEBUG_ZEBRA) {
 489                 struct prefix_sg more;
 490
 491                 more.src = c_oil->oil.mfcc_origin;
 492                 more.grp = c_oil->oil.mfcc_mcastgrp;
 493                 zlog_debug(
 494                         "Sending Request for New Channel Oil Information(%s) VIIF %d(%s)",
 495                         pim_str_sg_dump(&more), c_oil->oil.mfcc_parent,
 496                         c_oil->pim->vrf->name);
 497         }
 498
 499         if (!ifp)
 500                 return -1;
 501
 502         stream_reset(s);
 503         zclient_create_header(s, ZEBRA_IPMR_ROUTE_STATS, c_oil->pim->vrf_id);
 504         stream_put_in_addr(s, &c_oil->oil.mfcc_origin);
 505         stream_put_in_addr(s, &c_oil->oil.mfcc_mcastgrp);
 506         stream_putl(s, ifp->ifindex);
 507         stream_putw_at(s, 0, stream_get_endp(s));
 508
 509         count = stream_get_endp(s);
 510         ret = writen(zlookup->sock, s->data, count);
 511         if (ret <= 0) {
 512                 zlog_err(
 513                         "%s: writen() failure: %d writing to zclient lookup socket",
 514                         __PRETTY_FUNCTION__, errno);
 515                 return -1;
 516         }
 517
 518         s = zlookup->ibuf;
 519
 520         while (command != ZEBRA_IPMR_ROUTE_STATS) {
 521                 int err;
 522                 uint16_t length = 0;
 523                 vrf_id_t vrf_id;
 524                 uint8_t marker;
 525                 uint8_t version;
 526
 527                 stream_reset(s);
 528                 err = zclient_read_header(s, zlookup->sock, &length, &marker,
 529                                           &version, &vrf_id, &command);
 530                 if (err < 0) {
 531                         zlog_err("%s: zclient_read_header() failed",
 532                                  __PRETTY_FUNCTION__);
 533                         zclient_lookup_failed(zlookup);
 534                         return -1;
 535                 }
 536         }
 537
 538         sg.src.s_addr = stream_get_ipv4(s);
 539         sg.grp.s_addr = stream_get_ipv4(s);
 540         if (sg.src.s_addr != c_oil->oil.mfcc_origin.s_addr
 541             || sg.grp.s_addr != c_oil->oil.mfcc_mcastgrp.s_addr) {
 542                 if (PIM_DEBUG_ZEBRA) {
 543                         struct prefix_sg more;
 544
 545                         more.src = c_oil->oil.mfcc_origin;
 546                         more.grp = c_oil->oil.mfcc_mcastgrp;
 547                         zlog_err(
 548                                 "%s: Received wrong %s(%s) information requested",
 549                                 __PRETTY_FUNCTION__, pim_str_sg_dump(&more),
 550                                 c_oil->pim->vrf->name);
 551                 }
 552                 zclient_lookup_failed(zlookup);
 553                 return -3;
 554         }
 555
 556         stream_get(&lastused, s, sizeof(lastused));
 557         stream_getl(s);
 558
 559         c_oil->cc.lastused = lastused;
 560
 561         return 0;
 562 }