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 static struct interface *zebra_interface_if_lookup(struct stream *s, vrf_id_t vrf_id)
  50 {
  51         char ifname_tmp[INTERFACE_NAMSIZ];
  52
  53         /* Read interface name. */
  54         stream_get(ifname_tmp, s, INTERFACE_NAMSIZ);
  55
  56         /* And look it up. */
  57         return if_lookup_by_name(ifname_tmp,
  58                                  vrf_lookup_by_id(vrf_id));
  59 }
  60
  61 /* Inteface addition message from zebra. */
  62 static int interface_add(ZAPI_CALLBACK_ARGS)
  63 {
  64         struct interface *ifp;
  65
  66         ifp = zebra_interface_add_read(zclient->ibuf, vrf_id);
  67
  68         if (!ifp->info)
  69                 return 0;
  70
  71         return 0;
  72 }
  73
  74 static int interface_delete(ZAPI_CALLBACK_ARGS)
  75 {
  76         struct interface *ifp;
  77         struct stream *s;
  78
  79         s = zclient->ibuf;
  80         /* zebra_interface_state_read () updates interface structure in iflist
  81          */
  82         ifp = zebra_interface_state_read(s, vrf_id);
  83
  84         if (ifp == NULL)
  85                 return 0;
  86
  87         if_set_index(ifp, IFINDEX_INTERNAL);
  88
  89         return 0;
  90 }
  91
  92 static int interface_address_add(ZAPI_CALLBACK_ARGS)
  93 {
  94
  95         zebra_interface_address_read(cmd, zclient->ibuf, vrf_id);
  96
  97         return 0;
  98 }
  99
 100 static int interface_address_delete(ZAPI_CALLBACK_ARGS)
 101 {
 102         struct connected *c;
 103
 104         c = zebra_interface_address_read(cmd, zclient->ibuf, vrf_id);
 105
 106         if (!c)
 107                 return 0;
 108
 109         connected_free(c);
 110         return 0;
 111 }
 112
 113 static int interface_state_up(ZAPI_CALLBACK_ARGS)
 114 {
 115
 116         zebra_interface_if_lookup(zclient->ibuf, vrf_id);
 117
 118         return 0;
 119 }
 120
 121 static int interface_state_down(ZAPI_CALLBACK_ARGS)
 122 {
 123
 124         zebra_interface_state_read(zclient->ibuf, vrf_id);
 125
 126         return 0;
 127 }
 128
 129 void sharp_install_routes_helper(struct prefix *p, vrf_id_t vrf_id,
 130                                  uint8_t instance, struct nexthop_group *nhg,
 131                                  uint32_t routes)
 132 {
 133         uint32_t temp, i;
 134         bool v4 = false;
 135
 136         zlog_debug("Inserting %u routes", routes);
 137
 138         if (p->family == AF_INET) {
 139                 v4 = true;
 140                 temp = ntohl(p->u.prefix4.s_addr);
 141         } else
 142                 temp = ntohl(p->u.val32[3]);
 143
 144         monotime(&sg.r.t_start);
 145         for (i = 0; i < routes; i++) {
 146                 route_add(p, vrf_id, (uint8_t)instance, nhg);
 147                 if (v4)
 148                         p->u.prefix4.s_addr = htonl(++temp);
 149                 else
 150                         p->u.val32[3] = htonl(++temp);
 151         }
 152 }
 153
 154 void sharp_remove_routes_helper(struct prefix *p, vrf_id_t vrf_id,
 155                                 uint8_t instance, uint32_t routes)
 156 {
 157         uint32_t temp, i;
 158         bool v4 = false;
 159
 160         zlog_debug("Removing %u routes", routes);
 161
 162         if (p->family == AF_INET) {
 163                 v4 = true;
 164                 temp = ntohl(p->u.prefix4.s_addr);
 165         } else
 166                 temp = ntohl(p->u.val32[3]);
 167
 168         monotime(&sg.r.t_start);
 169         for (i = 0; i < routes; i++) {
 170                 route_delete(p, vrf_id, (uint8_t)instance);
 171                 if (v4)
 172                         p->u.prefix4.s_addr = htonl(++temp);
 173                 else
 174                         p->u.val32[3] = htonl(++temp);
 175         }
 176 }
 177
 178 static void handle_repeated(bool installed)
 179 {
 180         struct prefix p = sg.r.orig_prefix;
 181         sg.r.repeat--;
 182
 183         if (sg.r.repeat <= 0)
 184                 return;
 185
 186         if (installed) {
 187                 sg.r.removed_routes = 0;
 188                 sharp_remove_routes_helper(&p, sg.r.vrf_id,
 189                                            sg.r.inst, sg.r.total_routes);
 190         }
 191
 192         if (installed) {
 193                 sg.r.installed_routes = 0;
 194                 sharp_install_routes_helper(&p, sg.r.vrf_id, sg.r.inst,
 195                                             &sg.r.nhop_group,
 196                                             sg.r.total_routes);
 197         }
 198 }
 199
 200 static int route_notify_owner(ZAPI_CALLBACK_ARGS)
 201 {
 202         struct timeval r;
 203         struct prefix p;
 204         enum zapi_route_notify_owner note;
 205         uint32_t table;
 206
 207         if (!zapi_route_notify_decode(zclient->ibuf, &p, &table, &note))
 208                 return -1;
 209
 210         switch (note) {
 211         case ZAPI_ROUTE_INSTALLED:
 212                 sg.r.installed_routes++;
 213                 if (sg.r.total_routes == sg.r.installed_routes) {
 214                         monotime(&sg.r.t_end);
 215                         timersub(&sg.r.t_end, &sg.r.t_start, &r);
 216                         zlog_debug("Installed All Items %jd.%ld",
 217                                    (intmax_t)r.tv_sec, (long)r.tv_usec);
 218                         handle_repeated(true);
 219                 }
 220                 break;
 221         case ZAPI_ROUTE_FAIL_INSTALL:
 222                 zlog_debug("Failed install of route");
 223                 break;
 224         case ZAPI_ROUTE_BETTER_ADMIN_WON:
 225                 zlog_debug("Better Admin Distance won over us");
 226                 break;
 227         case ZAPI_ROUTE_REMOVED:
 228                 sg.r.removed_routes++;
 229                 if (sg.r.total_routes == sg.r.removed_routes) {
 230                         monotime(&sg.r.t_end);
 231                         timersub(&sg.r.t_end, &sg.r.t_start, &r);
 232                         zlog_debug("Removed all Items %jd.%ld",
 233                                    (intmax_t)r.tv_sec, (long)r.tv_usec);
 234                         handle_repeated(false);
 235                 }
 236                 break;
 237         case ZAPI_ROUTE_REMOVE_FAIL:
 238                 zlog_debug("Route removal Failure");
 239                 break;
 240         }
 241         return 0;
 242 }
 243
 244 static void zebra_connected(struct zclient *zclient)
 245 {
 246         zclient_send_reg_requests(zclient, VRF_DEFAULT);
 247 }
 248
 249 void vrf_label_add(vrf_id_t vrf_id, afi_t afi, mpls_label_t label)
 250 {
 251         zclient_send_vrf_label(zclient, vrf_id, afi, label, ZEBRA_LSP_SHARP);
 252 }
 253
 254 void route_add(struct prefix *p, vrf_id_t vrf_id,
 255                uint8_t instance, struct nexthop_group *nhg)
 256 {
 257         struct zapi_route api;
 258         struct zapi_nexthop *api_nh;
 259         struct nexthop *nh;
 260         int i = 0;
 261
 262         memset(&api, 0, sizeof(api));
 263         api.vrf_id = vrf_id;
 264         api.type = ZEBRA_ROUTE_SHARP;
 265         api.instance = instance;
 266         api.safi = SAFI_UNICAST;
 267         memcpy(&api.prefix, p, sizeof(*p));
 268
 269         SET_FLAG(api.flags, ZEBRA_FLAG_ALLOW_RECURSION);
 270         SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
 271
 272         for (ALL_NEXTHOPS_PTR(nhg, nh)) {
 273                 api_nh = &api.nexthops[i];
 274                 api_nh->vrf_id = nh->vrf_id;
 275                 api_nh->type = nh->type;
 276                 switch (nh->type) {
 277                 case NEXTHOP_TYPE_IPV4:
 278                         api_nh->gate = nh->gate;
 279                         break;
 280                 case NEXTHOP_TYPE_IPV4_IFINDEX:
 281                         api_nh->gate = nh->gate;
 282                         api_nh->ifindex = nh->ifindex;
 283                         break;
 284                 case NEXTHOP_TYPE_IFINDEX:
 285                         api_nh->ifindex = nh->ifindex;
 286                         break;
 287                 case NEXTHOP_TYPE_IPV6:
 288                         memcpy(&api_nh->gate.ipv6, &nh->gate.ipv6, 16);
 289                         break;
 290                 case NEXTHOP_TYPE_IPV6_IFINDEX:
 291                         api_nh->ifindex = nh->ifindex;
 292                         memcpy(&api_nh->gate.ipv6, &nh->gate.ipv6, 16);
 293                         break;
 294                 case NEXTHOP_TYPE_BLACKHOLE:
 295                         api_nh->bh_type = nh->bh_type;
 296                         break;
 297                 }
 298                 i++;
 299         }
 300         api.nexthop_num = i;
 301
 302         zclient_route_send(ZEBRA_ROUTE_ADD, zclient, &api);
 303 }
 304
 305 void route_delete(struct prefix *p, vrf_id_t vrf_id, uint8_t instance)
 306 {
 307         struct zapi_route api;
 308
 309         memset(&api, 0, sizeof(api));
 310         api.vrf_id = vrf_id;
 311         api.type = ZEBRA_ROUTE_SHARP;
 312         api.safi = SAFI_UNICAST;
 313         api.instance = instance;
 314         memcpy(&api.prefix, p, sizeof(*p));
 315         zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api);
 316
 317         return;
 318 }
 319
 320 void sharp_zebra_nexthop_watch(struct prefix *p, vrf_id_t vrf_id, bool import,
 321                                bool watch, bool connected)
 322 {
 323         int command;
 324
 325         if (!import) {
 326                 command = ZEBRA_NEXTHOP_REGISTER;
 327
 328                 if (!watch)
 329                         command = ZEBRA_NEXTHOP_UNREGISTER;
 330         } else {
 331                 command = ZEBRA_IMPORT_ROUTE_REGISTER;
 332
 333                 if (!watch)
 334                         command = ZEBRA_IMPORT_ROUTE_UNREGISTER;
 335         }
 336
 337         if (zclient_send_rnh(zclient, command, p, connected, vrf_id) < 0)
 338                 zlog_warn("%s: Failure to send nexthop to zebra",
 339                           __PRETTY_FUNCTION__);
 340 }
 341
 342 static int sharp_nexthop_update(ZAPI_CALLBACK_ARGS)
 343 {
 344         struct sharp_nh_tracker *nht;
 345         struct zapi_route nhr;
 346         char buf[PREFIX_STRLEN];
 347         int i;
 348
 349         if (!zapi_nexthop_update_decode(zclient->ibuf, &nhr)) {
 350                 zlog_warn("%s: Decode of update failed", __PRETTY_FUNCTION__);
 351
 352                 return 0;
 353         }
 354
 355         zlog_debug("Received update for %s",
 356                    prefix2str(&nhr.prefix, buf, sizeof(buf)));
 357
 358         nht = sharp_nh_tracker_get(&nhr.prefix);
 359         nht->nhop_num = nhr.nexthop_num;
 360         nht->updates++;
 361
 362         for (i = 0; i < nhr.nexthop_num; i++) {
 363                 struct zapi_nexthop *znh = &nhr.nexthops[i];
 364
 365                 switch (znh->type) {
 366                 case NEXTHOP_TYPE_IPV4_IFINDEX:
 367                 case NEXTHOP_TYPE_IPV4:
 368                         zlog_debug(
 369                                 "\tNexthop %s, type: %d, ifindex: %d, vrf: %d, label_num: %d",
 370                                 inet_ntop(AF_INET, &znh->gate.ipv4.s_addr, buf,
 371                                           sizeof(buf)),
 372                                 znh->type, znh->ifindex, znh->vrf_id,
 373                                 znh->label_num);
 374                         break;
 375                 case NEXTHOP_TYPE_IPV6_IFINDEX:
 376                 case NEXTHOP_TYPE_IPV6:
 377                         zlog_debug(
 378                                 "\tNexthop %s, type: %d, ifindex: %d, vrf: %d, label_num: %d",
 379                                 inet_ntop(AF_INET6, &znh->gate.ipv6, buf,
 380                                           sizeof(buf)),
 381                                 znh->type, znh->ifindex, znh->vrf_id,
 382                                 znh->label_num);
 383                         break;
 384                 case NEXTHOP_TYPE_IFINDEX:
 385                         zlog_debug("\tNexthop IFINDEX: %d, ifindex: %d",
 386                                    znh->type, znh->ifindex);
 387                         break;
 388                 case NEXTHOP_TYPE_BLACKHOLE:
 389                         zlog_debug("\tNexthop blackhole");
 390                         break;
 391                 }
 392         }
 393         return 0;
 394 }
 395
 396 extern struct zebra_privs_t sharp_privs;
 397
 398 void sharp_zebra_init(void)
 399 {
 400         struct zclient_options opt = {.receive_notify = true};
 401
 402         zclient = zclient_new(master, &opt);
 403
 404         zclient_init(zclient, ZEBRA_ROUTE_SHARP, 0, &sharp_privs);
 405         zclient->zebra_connected = zebra_connected;
 406         zclient->interface_add = interface_add;
 407         zclient->interface_delete = interface_delete;
 408         zclient->interface_up = interface_state_up;
 409         zclient->interface_down = interface_state_down;
 410         zclient->interface_address_add = interface_address_add;
 411         zclient->interface_address_delete = interface_address_delete;
 412         zclient->route_notify_owner = route_notify_owner;
 413         zclient->nexthop_update = sharp_nexthop_update;
 414         zclient->import_check_update = sharp_nexthop_update;
 415 }