sharpd/sharp_zebra.c

   1 /*
   2  * Zebra connect code.
   3  * Copyright (C) Cumulus Networks, Inc.
   4  *               Donald Sharp
   5  *
   6  * This file is part of FRR.
   7  *
   8  * FRR is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by the
  10  * Free Software Foundation; either version 2, or (at your option) any
  11  * later version.
  12  *
  13  * FRR is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; see the file COPYING; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22 #include <zebra.h>
  23
  24 #include "thread.h"
  25 #include "command.h"
  26 #include "network.h"
  27 #include "prefix.h"
  28 #include "routemap.h"
  29 #include "table.h"
  30 #include "stream.h"
  31 #include "memory.h"
  32 #include "zclient.h"
  33 #include "filter.h"
  34 #include "plist.h"
  35 #include "log.h"
  36 #include "nexthop.h"
  37 #include "nexthop_group.h"
  38
  39 #include "sharp_globals.h"
  40 #include "sharp_nht.h"
  41 #include "sharp_zebra.h"
  42
  43 /* Zebra structure to hold current status. */
  44 struct zclient *zclient = NULL;
  45
  46 /* For registering threads. */
  47 extern struct thread_master *master;
  48
  49 /* Inteface addition message from zebra. */
  50 static int sharp_ifp_create(struct interface *ifp)
  51 {
  52         return 0;
  53 }
  54
  55 static int sharp_ifp_destroy(struct interface *ifp)
  56 {
  57         return 0;
  58 }
  59
  60 static int interface_address_add(ZAPI_CALLBACK_ARGS)
  61 {
  62         zebra_interface_address_read(cmd, zclient->ibuf, vrf_id);
  63
  64         return 0;
  65 }
  66
  67 static int interface_address_delete(ZAPI_CALLBACK_ARGS)
  68 {
  69         struct connected *c;
  70
  71         c = zebra_interface_address_read(cmd, zclient->ibuf, vrf_id);
  72
  73         if (!c)
  74                 return 0;
  75
  76         connected_free(c);
  77         return 0;
  78 }
  79
  80 static int sharp_ifp_up(struct interface *ifp)
  81 {
  82         return 0;
  83 }
  84
  85 static int sharp_ifp_down(struct interface *ifp)
  86 {
  87         return 0;
  88 }
  89
  90 void sharp_install_routes_helper(struct prefix *p, vrf_id_t vrf_id,
  91                                  uint8_t instance, struct nexthop_group *nhg,
  92                                  uint32_t routes)
  93 {
  94         uint32_t temp, i;
  95         bool v4 = false;
  96
  97         zlog_debug("Inserting %u routes", routes);
  98
  99         if (p->family == AF_INET) {
 100                 v4 = true;
 101                 temp = ntohl(p->u.prefix4.s_addr);
 102         } else
 103                 temp = ntohl(p->u.val32[3]);
 104
 105         monotime(&sg.r.t_start);
 106         for (i = 0; i < routes; i++) {
 107                 route_add(p, vrf_id, (uint8_t)instance, nhg);
 108                 if (v4)
 109                         p->u.prefix4.s_addr = htonl(++temp);
 110                 else
 111                         p->u.val32[3] = htonl(++temp);
 112         }
 113 }
 114
 115 void sharp_remove_routes_helper(struct prefix *p, vrf_id_t vrf_id,
 116                                 uint8_t instance, uint32_t routes)
 117 {
 118         uint32_t temp, i;
 119         bool v4 = false;
 120
 121         zlog_debug("Removing %u routes", routes);
 122
 123         if (p->family == AF_INET) {
 124                 v4 = true;
 125                 temp = ntohl(p->u.prefix4.s_addr);
 126         } else
 127                 temp = ntohl(p->u.val32[3]);
 128
 129         monotime(&sg.r.t_start);
 130         for (i = 0; i < routes; i++) {
 131                 route_delete(p, vrf_id, (uint8_t)instance);
 132                 if (v4)
 133                         p->u.prefix4.s_addr = htonl(++temp);
 134                 else
 135                         p->u.val32[3] = htonl(++temp);
 136         }
 137 }
 138
 139 static void handle_repeated(bool installed)
 140 {
 141         struct prefix p = sg.r.orig_prefix;
 142         sg.r.repeat--;
 143
 144         if (sg.r.repeat <= 0)
 145                 return;
 146
 147         if (installed) {
 148                 sg.r.removed_routes = 0;
 149                 sharp_remove_routes_helper(&p, sg.r.vrf_id,
 150                                            sg.r.inst, sg.r.total_routes);
 151         }
 152
 153         if (!installed) {
 154                 sg.r.installed_routes = 0;
 155                 sharp_install_routes_helper(&p, sg.r.vrf_id, sg.r.inst,
 156                                             &sg.r.nhop_group,
 157                                             sg.r.total_routes);
 158         }
 159 }
 160
 161 static int route_notify_owner(ZAPI_CALLBACK_ARGS)
 162 {
 163         struct timeval r;
 164         struct prefix p;
 165         enum zapi_route_notify_owner note;
 166         uint32_t table;
 167
 168         if (!zapi_route_notify_decode(zclient->ibuf, &p, &table, &note))
 169                 return -1;
 170
 171         switch (note) {
 172         case ZAPI_ROUTE_INSTALLED:
 173                 sg.r.installed_routes++;
 174                 if (sg.r.total_routes == sg.r.installed_routes) {
 175                         monotime(&sg.r.t_end);
 176                         timersub(&sg.r.t_end, &sg.r.t_start, &r);
 177                         zlog_debug("Installed All Items %jd.%ld",
 178                                    (intmax_t)r.tv_sec, (long)r.tv_usec);
 179                         handle_repeated(true);
 180                 }
 181                 break;
 182         case ZAPI_ROUTE_FAIL_INSTALL:
 183                 zlog_debug("Failed install of route");
 184                 break;
 185         case ZAPI_ROUTE_BETTER_ADMIN_WON:
 186                 zlog_debug("Better Admin Distance won over us");
 187                 break;
 188         case ZAPI_ROUTE_REMOVED:
 189                 sg.r.removed_routes++;
 190                 if (sg.r.total_routes == sg.r.removed_routes) {
 191                         monotime(&sg.r.t_end);
 192                         timersub(&sg.r.t_end, &sg.r.t_start, &r);
 193                         zlog_debug("Removed all Items %jd.%ld",
 194                                    (intmax_t)r.tv_sec, (long)r.tv_usec);
 195                         handle_repeated(false);
 196                 }
 197                 break;
 198         case ZAPI_ROUTE_REMOVE_FAIL:
 199                 zlog_debug("Route removal Failure");
 200                 break;
 201         }
 202         return 0;
 203 }
 204
 205 static void zebra_connected(struct zclient *zclient)
 206 {
 207         zclient_send_reg_requests(zclient, VRF_DEFAULT);
 208
 209         /*
 210          * Do not actually turn this on yet
 211          * This is just the start of the infrastructure needed here
 212          * This can be fixed at a later time.
 213          *
 214          *      zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP,
 215          *                      ZEBRA_ROUTE_ALL, 0, VRF_DEFAULT);
 216          */
 217 }
 218
 219 void vrf_label_add(vrf_id_t vrf_id, afi_t afi, mpls_label_t label)
 220 {
 221         zclient_send_vrf_label(zclient, vrf_id, afi, label, ZEBRA_LSP_SHARP);
 222 }
 223
 224 void route_add(struct prefix *p, vrf_id_t vrf_id,
 225                uint8_t instance, struct nexthop_group *nhg)
 226 {
 227         struct zapi_route api;
 228         struct zapi_nexthop *api_nh;
 229         struct nexthop *nh;
 230         int i = 0;
 231
 232         memset(&api, 0, sizeof(api));
 233         api.vrf_id = vrf_id;
 234         api.type = ZEBRA_ROUTE_SHARP;
 235         api.instance = instance;
 236         api.safi = SAFI_UNICAST;
 237         memcpy(&api.prefix, p, sizeof(*p));
 238
 239         SET_FLAG(api.flags, ZEBRA_FLAG_ALLOW_RECURSION);
 240         SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
 241
 242         for (ALL_NEXTHOPS_PTR(nhg, nh)) {
 243                 api_nh = &api.nexthops[i];
 244                 api_nh->vrf_id = nh->vrf_id;
 245                 api_nh->type = nh->type;
 246                 switch (nh->type) {
 247                 case NEXTHOP_TYPE_IPV4:
 248                         api_nh->gate = nh->gate;
 249                         break;
 250                 case NEXTHOP_TYPE_IPV4_IFINDEX:
 251                         api_nh->gate = nh->gate;
 252                         api_nh->ifindex = nh->ifindex;
 253                         break;
 254                 case NEXTHOP_TYPE_IFINDEX:
 255                         api_nh->ifindex = nh->ifindex;
 256                         break;
 257                 case NEXTHOP_TYPE_IPV6:
 258                         memcpy(&api_nh->gate.ipv6, &nh->gate.ipv6, 16);
 259                         break;
 260                 case NEXTHOP_TYPE_IPV6_IFINDEX:
 261                         api_nh->ifindex = nh->ifindex;
 262                         memcpy(&api_nh->gate.ipv6, &nh->gate.ipv6, 16);
 263                         break;
 264                 case NEXTHOP_TYPE_BLACKHOLE:
 265                         api_nh->bh_type = nh->bh_type;
 266                         break;
 267                 }
 268                 i++;
 269         }
 270         api.nexthop_num = i;
 271
 272         zclient_route_send(ZEBRA_ROUTE_ADD, zclient, &api);
 273 }
 274
 275 void route_delete(struct prefix *p, vrf_id_t vrf_id, uint8_t instance)
 276 {
 277         struct zapi_route api;
 278
 279         memset(&api, 0, sizeof(api));
 280         api.vrf_id = vrf_id;
 281         api.type = ZEBRA_ROUTE_SHARP;
 282         api.safi = SAFI_UNICAST;
 283         api.instance = instance;
 284         memcpy(&api.prefix, p, sizeof(*p));
 285         zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api);
 286
 287         return;
 288 }
 289
 290 void sharp_zebra_nexthop_watch(struct prefix *p, vrf_id_t vrf_id, bool import,
 291                                bool watch, bool connected)
 292 {
 293         int command;
 294
 295         if (!import) {
 296                 command = ZEBRA_NEXTHOP_REGISTER;
 297
 298                 if (!watch)
 299                         command = ZEBRA_NEXTHOP_UNREGISTER;
 300         } else {
 301                 command = ZEBRA_IMPORT_ROUTE_REGISTER;
 302
 303                 if (!watch)
 304                         command = ZEBRA_IMPORT_ROUTE_UNREGISTER;
 305         }
 306
 307         if (zclient_send_rnh(zclient, command, p, connected, vrf_id) < 0)
 308                 zlog_warn("%s: Failure to send nexthop to zebra",
 309                           __PRETTY_FUNCTION__);
 310 }
 311
 312 static int sharp_debug_nexthops(struct zapi_route *api)
 313 {
 314         int i;
 315         char buf[PREFIX_STRLEN];
 316
 317         for (i = 0; i < api->nexthop_num; i++) {
 318                 struct zapi_nexthop *znh = &api->nexthops[i];
 319
 320                 switch (znh->type) {
 321                 case NEXTHOP_TYPE_IPV4_IFINDEX:
 322                 case NEXTHOP_TYPE_IPV4:
 323                         zlog_debug(
 324                                 "\tNexthop %s, type: %d, ifindex: %d, vrf: %d, label_num: %d",
 325                                 inet_ntop(AF_INET, &znh->gate.ipv4.s_addr, buf,
 326                                           sizeof(buf)),
 327                                 znh->type, znh->ifindex, znh->vrf_id,
 328                                 znh->label_num);
 329                         break;
 330                 case NEXTHOP_TYPE_IPV6_IFINDEX:
 331                 case NEXTHOP_TYPE_IPV6:
 332                         zlog_debug(
 333                                 "\tNexthop %s, type: %d, ifindex: %d, vrf: %d, label_num: %d",
 334                                 inet_ntop(AF_INET6, &znh->gate.ipv6, buf,
 335                                           sizeof(buf)),
 336                                 znh->type, znh->ifindex, znh->vrf_id,
 337                                 znh->label_num);
 338                         break;
 339                 case NEXTHOP_TYPE_IFINDEX:
 340                         zlog_debug("\tNexthop IFINDEX: %d, ifindex: %d",
 341                                    znh->type, znh->ifindex);
 342                         break;
 343                 case NEXTHOP_TYPE_BLACKHOLE:
 344                         zlog_debug("\tNexthop blackhole");
 345                         break;
 346                 }
 347         }
 348
 349         return i;
 350 }
 351 static int sharp_nexthop_update(ZAPI_CALLBACK_ARGS)
 352 {
 353         struct sharp_nh_tracker *nht;
 354         struct zapi_route nhr;
 355
 356         if (!zapi_nexthop_update_decode(zclient->ibuf, &nhr)) {
 357                 zlog_warn("%s: Decode of update failed", __PRETTY_FUNCTION__);
 358
 359                 return 0;
 360         }
 361
 362         zlog_debug("Received update for %pFX", &nhr.prefix);
 363
 364         nht = sharp_nh_tracker_get(&nhr.prefix);
 365         nht->nhop_num = nhr.nexthop_num;
 366         nht->updates++;
 367
 368         sharp_debug_nexthops(&nhr);
 369
 370         return 0;
 371 }
 372
 373 static int sharp_redistribute_route(ZAPI_CALLBACK_ARGS)
 374 {
 375         struct zapi_route api;
 376
 377         if (zapi_route_decode(zclient->ibuf, &api) < 0)
 378                 zlog_warn("%s: Decode of redistribute failed: %d",
 379                           __PRETTY_FUNCTION__,
 380                           ZEBRA_REDISTRIBUTE_ROUTE_ADD);
 381
 382         zlog_debug("%s: %pFX (%s)", zserv_command_string(cmd),
 383                    &api.prefix, zebra_route_string(api.type));
 384
 385         sharp_debug_nexthops(&api);
 386
 387         return 0;
 388 }
 389
 390 extern struct zebra_privs_t sharp_privs;
 391
 392 void sharp_zebra_init(void)
 393 {
 394         struct zclient_options opt = {.receive_notify = true};
 395
 396         if_zapi_callbacks(sharp_ifp_create, sharp_ifp_up,
 397                           sharp_ifp_down, sharp_ifp_destroy);
 398
 399         zclient = zclient_new(master, &opt);
 400
 401         zclient_init(zclient, ZEBRA_ROUTE_SHARP, 0, &sharp_privs);
 402         zclient->zebra_connected = zebra_connected;
 403         zclient->interface_address_add = interface_address_add;
 404         zclient->interface_address_delete = interface_address_delete;
 405         zclient->route_notify_owner = route_notify_owner;
 406         zclient->nexthop_update = sharp_nexthop_update;
 407         zclient->import_check_update = sharp_nexthop_update;
 408
 409         zclient->redistribute_route_add = sharp_redistribute_route;
 410         zclient->redistribute_route_del = sharp_redistribute_route;
 411 }