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