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                 switch (nexthop_type) {
 219                 case NEXTHOP_TYPE_IFINDEX:
 220                         nexthop_tab[num_ifindex].ifindex = stream_getl(s);
 221                         /*
 222                          * Connected route (i.e. no nexthop), use
 223                          * address passed in as PIM nexthop.  This will
 224                          * allow us to work in cases where we are
 225                          * trying to find a route for this box.
 226                          */
 227                         nexthop_tab[num_ifindex].nexthop_addr.family = AF_INET;
 228                         nexthop_tab[num_ifindex].nexthop_addr.prefixlen =
 229                                 IPV4_MAX_BITLEN;
 230                         nexthop_tab[num_ifindex].nexthop_addr.u.prefix4 =
 231                                 addr;
 232                         ++num_ifindex;
 233                         break;
 234                 case NEXTHOP_TYPE_IPV4_IFINDEX:
 235                 case NEXTHOP_TYPE_IPV4:
 236                         nexthop_tab[num_ifindex].nexthop_addr.family = AF_INET;
 237                         nexthop_tab[num_ifindex].nexthop_addr.u.prefix4.s_addr =
 238                                 stream_get_ipv4(s);
 239                         nexthop_tab[num_ifindex].ifindex = stream_getl(s);
 240                         ++num_ifindex;
 241                         break;
 242                 case NEXTHOP_TYPE_IPV6_IFINDEX:
 243                         nexthop_tab[num_ifindex].nexthop_addr.family = AF_INET6;
 244                         stream_get(&nexthop_tab[num_ifindex]
 245                                             .nexthop_addr.u.prefix6,
 246                                    s, sizeof(struct in6_addr));
 247                         nexthop_tab[num_ifindex].ifindex = stream_getl(s);
 248
 249                         p.family = AF_INET6;
 250                         p.prefixlen = IPV6_MAX_PREFIXLEN;
 251                         memcpy(&p.u.prefix6,
 252                                &nexthop_tab[num_ifindex].nexthop_addr.u.prefix6,
 253                                sizeof(struct in6_addr));
 254
 255                         /*
 256                          * If we are sending v6 secondary assume we receive v6
 257                          * secondary
 258                          */
 259                         if (pim->send_v6_secondary)
 260                                 nbr = pim_neighbor_find_by_secondary(
 261                                         if_lookup_by_index(
 262                                                 nexthop_tab[num_ifindex]
 263                                                         .ifindex,
 264                                                 vrf_id),
 265                                         &p);
 266                         else
 267                                 nbr = pim_neighbor_find_if(if_lookup_by_index(
 268                                         nexthop_tab[num_ifindex].ifindex,
 269                                         vrf_id));
 270                         if (nbr) {
 271                                 nexthop_tab[num_ifindex].nexthop_addr.family =
 272                                         AF_INET;
 273                                 nexthop_tab[num_ifindex]
 274                                         .nexthop_addr.u.prefix4 =
 275                                         nbr->source_addr;
 276                         }
 277                         ++num_ifindex;
 278                         break;
 279                 case NEXTHOP_TYPE_IPV6:
 280                 case NEXTHOP_TYPE_BLACKHOLE:
 281                         /* ignore */
 282                         continue;
 283                 }
 284                 nexthop_tab[num_ifindex].protocol_distance = distance;
 285                 nexthop_tab[num_ifindex].route_metric = metric;
 286         }
 287
 288         return num_ifindex;
 289 }
 290
 291 static int zclient_lookup_nexthop_once(struct pim_instance *pim,
 292                                        struct pim_zlookup_nexthop nexthop_tab[],
 293                                        const int tab_size, struct in_addr addr)
 294 {
 295         struct stream *s;
 296         int ret;
 297
 298         if (PIM_DEBUG_PIM_NHT_DETAIL) {
 299                 char addr_str[INET_ADDRSTRLEN];
 300                 pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
 301                 zlog_debug("%s: addr=%s(%s)", __PRETTY_FUNCTION__, addr_str,
 302                            pim->vrf->name);
 303         }
 304
 305         /* Check socket. */
 306         if (zlookup->sock < 0) {
 307                 zlog_err("%s: zclient lookup socket is not connected",
 308                          __PRETTY_FUNCTION__);
 309                 zclient_lookup_failed(zlookup);
 310                 return -1;
 311         }
 312
 313         if (pim->vrf->vrf_id == VRF_UNKNOWN) {
 314                 zlog_err(
 315                         "%s: VRF: %s does not fully exist yet, delaying lookup",
 316                         __PRETTY_FUNCTION__, pim->vrf->name);
 317                 return -1;
 318         }
 319
 320         s = zlookup->obuf;
 321         stream_reset(s);
 322         zclient_create_header(s, ZEBRA_IPV4_NEXTHOP_LOOKUP_MRIB, pim->vrf_id);
 323         stream_put_in_addr(s, &addr);
 324         stream_putw_at(s, 0, stream_get_endp(s));
 325
 326         ret = writen(zlookup->sock, s->data, stream_get_endp(s));
 327         if (ret < 0) {
 328                 zlog_err(
 329                         "%s: writen() failure: %d writing to zclient lookup socket",
 330                         __PRETTY_FUNCTION__, errno);
 331                 zclient_lookup_failed(zlookup);
 332                 return -2;
 333         }
 334         if (ret == 0) {
 335                 zlog_err("%s: connection closed on zclient lookup socket",
 336                          __PRETTY_FUNCTION__);
 337                 zclient_lookup_failed(zlookup);
 338                 return -3;
 339         }
 340
 341         return zclient_read_nexthop(pim, zlookup, nexthop_tab, tab_size, addr);
 342 }
 343
 344 int zclient_lookup_nexthop(struct pim_instance *pim,
 345                            struct pim_zlookup_nexthop nexthop_tab[],
 346                            const int tab_size, struct in_addr addr,
 347                            int max_lookup)
 348 {
 349         int lookup;
 350         uint32_t route_metric = 0xFFFFFFFF;
 351         uint8_t protocol_distance = 0xFF;
 352
 353         pim->nexthop_lookups++;
 354
 355         for (lookup = 0; lookup < max_lookup; ++lookup) {
 356                 int num_ifindex;
 357                 int first_ifindex;
 358                 struct prefix nexthop_addr;
 359
 360                 num_ifindex = zclient_lookup_nexthop_once(pim, nexthop_tab,
 361                                                           tab_size, addr);
 362                 if (num_ifindex < 1) {
 363                         if (PIM_DEBUG_PIM_NHT) {
 364                                 char addr_str[INET_ADDRSTRLEN];
 365                                 pim_inet4_dump("<addr?>", addr, addr_str,
 366                                                sizeof(addr_str));
 367                                 zlog_debug(
 368                                         "%s: lookup=%d/%d: could not find nexthop ifindex for address %s(%s)",
 369                                         __PRETTY_FUNCTION__, lookup, max_lookup,
 370                                         addr_str, pim->vrf->name);
 371                         }
 372                         return -1;
 373                 }
 374
 375                 if (lookup < 1) {
 376                         /* this is the non-recursive lookup - save original
 377                          * metric/distance */
 378                         route_metric = nexthop_tab[0].route_metric;
 379                         protocol_distance = nexthop_tab[0].protocol_distance;
 380                 }
 381
 382                 /*
 383                  * FIXME: Non-recursive nexthop ensured only for first ifindex.
 384                  * However, recursive route lookup should really be fixed in
 385                  * zebra daemon.
 386                  * See also TODO T24.
 387                  *
 388                  * So Zebra for NEXTHOP_TYPE_IPV4 returns the ifindex now since
 389                  * it was being stored.  This Doesn't solve all cases of
 390                  * recursive lookup but for the most common types it does.
 391                  */
 392                 first_ifindex = nexthop_tab[0].ifindex;
 393                 nexthop_addr = nexthop_tab[0].nexthop_addr;
 394                 if (first_ifindex > 0) {
 395                         /* found: first ifindex is non-recursive nexthop */
 396
 397                         if (lookup > 0) {
 398                                 /* Report non-recursive success after first
 399                                  * lookup */
 400                                 if (PIM_DEBUG_PIM_NHT) {
 401                                         char addr_str[INET_ADDRSTRLEN];
 402                                         pim_inet4_dump("<addr?>", addr,
 403                                                        addr_str,
 404                                                        sizeof(addr_str));
 405                                         zlog_debug(
 406                                                 "%s: lookup=%d/%d: found non-recursive ifindex=%d for address %s(%s) dist=%d met=%d",
 407                                                 __PRETTY_FUNCTION__, lookup,
 408                                                 max_lookup, first_ifindex,
 409                                                 addr_str, pim->vrf->name,
 410                                                 nexthop_tab[0]
 411                                                         .protocol_distance,
 412                                                 nexthop_tab[0].route_metric);
 413                                 }
 414
 415                                 /* use last address as nexthop address */
 416                                 nexthop_tab[0].nexthop_addr.u.prefix4 = addr;
 417
 418                                 /* report original route metric/distance */
 419                                 nexthop_tab[0].route_metric = route_metric;
 420                                 nexthop_tab[0].protocol_distance =
 421                                         protocol_distance;
 422                         }
 423
 424                         return num_ifindex;
 425                 }
 426
 427                 if (PIM_DEBUG_PIM_NHT) {
 428                         char addr_str[INET_ADDRSTRLEN];
 429                         char nexthop_str[PREFIX_STRLEN];
 430                         pim_inet4_dump("<addr?>", addr, addr_str,
 431                                        sizeof(addr_str));
 432                         pim_addr_dump("<nexthop?>", &nexthop_addr, nexthop_str,
 433                                       sizeof(nexthop_str));
 434                         zlog_debug(
 435                                 "%s: lookup=%d/%d: zebra returned recursive nexthop %s for address %s(%s) dist=%d met=%d",
 436                                 __PRETTY_FUNCTION__, lookup, max_lookup,
 437                                 nexthop_str, addr_str, pim->vrf->name,
 438                                 nexthop_tab[0].protocol_distance,
 439                                 nexthop_tab[0].route_metric);
 440                 }
 441
 442                 addr = nexthop_addr.u.prefix4; /* use nexthop addr for
 443                                                   recursive lookup */
 444
 445         } /* for (max_lookup) */
 446
 447         if (PIM_DEBUG_PIM_NHT) {
 448                 char addr_str[INET_ADDRSTRLEN];
 449                 pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
 450                 zlog_warn(
 451                         "%s: lookup=%d/%d: failure searching recursive nexthop ifindex for address %s(%s)",
 452                         __PRETTY_FUNCTION__, lookup, max_lookup, addr_str,
 453                         pim->vrf->name);
 454         }
 455
 456         return -2;
 457 }
 458
 459 void pim_zlookup_show_ip_multicast(struct vty *vty)
 460 {
 461         vty_out(vty, "Zclient lookup socket: ");
 462         if (zlookup) {
 463                 vty_out(vty, "%d failures=%d\n", zlookup->sock, zlookup->fail);
 464         } else {
 465                 vty_out(vty, "<null zclient>\n");
 466         }
 467 }
 468
 469 int pim_zlookup_sg_statistics(struct channel_oil *c_oil)
 470 {
 471         struct stream *s = zlookup->obuf;
 472         uint16_t command = 0;
 473         unsigned long long lastused;
 474         struct prefix_sg sg;
 475         int count = 0;
 476         int ret;
 477         struct interface *ifp =
 478                 pim_if_find_by_vif_index(c_oil->pim, c_oil->oil.mfcc_parent);
 479
 480         if (PIM_DEBUG_ZEBRA) {
 481                 struct prefix_sg more;
 482
 483                 more.src = c_oil->oil.mfcc_origin;
 484                 more.grp = c_oil->oil.mfcc_mcastgrp;
 485                 zlog_debug(
 486                         "Sending Request for New Channel Oil Information(%s) VIIF %d(%s)",
 487                         pim_str_sg_dump(&more), c_oil->oil.mfcc_parent,
 488                         c_oil->pim->vrf->name);
 489         }
 490
 491         if (!ifp)
 492                 return -1;
 493
 494         stream_reset(s);
 495         zclient_create_header(s, ZEBRA_IPMR_ROUTE_STATS, c_oil->pim->vrf_id);
 496         stream_put_in_addr(s, &c_oil->oil.mfcc_origin);
 497         stream_put_in_addr(s, &c_oil->oil.mfcc_mcastgrp);
 498         stream_putl(s, ifp->ifindex);
 499         stream_putw_at(s, 0, stream_get_endp(s));
 500
 501         count = stream_get_endp(s);
 502         ret = writen(zlookup->sock, s->data, count);
 503         if (ret <= 0) {
 504                 zlog_err(
 505                         "%s: writen() failure: %d writing to zclient lookup socket",
 506                         __PRETTY_FUNCTION__, errno);
 507                 return -1;
 508         }
 509
 510         s = zlookup->ibuf;
 511
 512         while (command != ZEBRA_IPMR_ROUTE_STATS) {
 513                 int err;
 514                 uint16_t length = 0;
 515                 vrf_id_t vrf_id;
 516                 uint8_t marker;
 517                 uint8_t version;
 518
 519                 stream_reset(s);
 520                 err = zclient_read_header(s, zlookup->sock, &length, &marker,
 521                                           &version, &vrf_id, &command);
 522                 if (err < 0) {
 523                         zlog_err("%s: zclient_read_header() failed",
 524                                  __PRETTY_FUNCTION__);
 525                         zclient_lookup_failed(zlookup);
 526                         return -1;
 527                 }
 528         }
 529
 530         sg.src.s_addr = stream_get_ipv4(s);
 531         sg.grp.s_addr = stream_get_ipv4(s);
 532         if (sg.src.s_addr != c_oil->oil.mfcc_origin.s_addr
 533             || sg.grp.s_addr != c_oil->oil.mfcc_mcastgrp.s_addr) {
 534                 if (PIM_DEBUG_ZEBRA) {
 535                         struct prefix_sg more;
 536
 537                         more.src = c_oil->oil.mfcc_origin;
 538                         more.grp = c_oil->oil.mfcc_mcastgrp;
 539                         zlog_err(
 540                                 "%s: Received wrong %s(%s) information requested",
 541                                 __PRETTY_FUNCTION__, pim_str_sg_dump(&more),
 542                                 c_oil->pim->vrf->name);
 543                 }
 544                 zclient_lookup_failed(zlookup);
 545                 return -3;
 546         }
 547
 548         stream_get(&lastused, s, sizeof(lastused));
 549         stream_getl(s);
 550
 551         c_oil->cc.lastused = lastused;
 552
 553         return 0;
 554 }