staticd/static_zebra.c

   1 /*
   2  * Zebra connect code.
   3  * Copyright (C) 2018 Cumulus Networks, Inc.
   4  *               Donald Sharp
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the Free
   8  * Software Foundation; either version 2 of the License, or (at your option)
   9  * any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; see the file COPYING; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20 #include <zebra.h>
  21
  22 #include "thread.h"
  23 #include "command.h"
  24 #include "network.h"
  25 #include "prefix.h"
  26 #include "routemap.h"
  27 #include "table.h"
  28 #include "srcdest_table.h"
  29 #include "stream.h"
  30 #include "memory.h"
  31 #include "zclient.h"
  32 #include "filter.h"
  33 #include "plist.h"
  34 #include "log.h"
  35 #include "nexthop.h"
  36 #include "nexthop_group.h"
  37 #include "hash.h"
  38 #include "jhash.h"
  39
  40 #include "static_vrf.h"
  41 #include "static_routes.h"
  42 #include "static_zebra.h"
  43 #include "static_nht.h"
  44 #include "static_vty.h"
  45
  46 /* Zebra structure to hold current status. */
  47 struct zclient *zclient;
  48 static struct hash *static_nht_hash;
  49
  50 static struct interface *zebra_interface_if_lookup(struct stream *s, vrf_id_t vrf_id)
  51 {
  52         char ifname_tmp[INTERFACE_NAMSIZ];
  53
  54         /* Read interface name. */
  55         stream_get(ifname_tmp, s, INTERFACE_NAMSIZ);
  56
  57         /* And look it up. */
  58         return if_lookup_by_name(ifname_tmp,
  59                                  vrf_lookup_by_id(vrf_id));
  60 }
  61
  62 /* Inteface addition message from zebra. */
  63 static int interface_add(ZAPI_CALLBACK_ARGS)
  64 {
  65         struct interface *ifp;
  66
  67         ifp = zebra_interface_add_read(zclient->ibuf, vrf_id);
  68
  69         if (!ifp)
  70                 return 0;
  71
  72         static_ifindex_update(ifp, true);
  73         return 0;
  74 }
  75
  76 static int interface_delete(ZAPI_CALLBACK_ARGS)
  77 {
  78         struct interface *ifp;
  79         struct stream *s;
  80
  81         s = zclient->ibuf;
  82         /* zebra_interface_state_read () updates interface structure in iflist
  83          */
  84         ifp = zebra_interface_state_read(s, vrf_id);
  85
  86         if (ifp == NULL)
  87                 return 0;
  88
  89         if_set_index(ifp, IFINDEX_INTERNAL);
  90
  91         static_ifindex_update(ifp, false);
  92         return 0;
  93 }
  94
  95 static int interface_address_add(ZAPI_CALLBACK_ARGS)
  96 {
  97         zebra_interface_address_read(cmd, zclient->ibuf, vrf_id);
  98
  99         return 0;
 100 }
 101
 102 static int interface_address_delete(ZAPI_CALLBACK_ARGS)
 103 {
 104         struct connected *c;
 105
 106         c = zebra_interface_address_read(cmd, zclient->ibuf, vrf_id);
 107
 108         if (!c)
 109                 return 0;
 110
 111         connected_free(c);
 112         return 0;
 113 }
 114
 115 static int interface_state_up(ZAPI_CALLBACK_ARGS)
 116 {
 117         struct interface *ifp;
 118
 119         ifp = zebra_interface_if_lookup(zclient->ibuf, vrf_id);
 120
 121         if (ifp) {
 122                 if (if_is_vrf(ifp)) {
 123                         struct static_vrf *svrf =
 124                                         static_vrf_lookup_by_id(vrf_id);
 125
 126                         static_fixup_vrf_ids(svrf);
 127                         static_config_install_delayed_routes(svrf);
 128                 }
 129
 130                 /* Install any static reliant on this interface coming up */
 131                 static_install_intf_nh(ifp);
 132         }
 133
 134         return 0;
 135 }
 136
 137 static int interface_state_down(ZAPI_CALLBACK_ARGS)
 138 {
 139         zebra_interface_state_read(zclient->ibuf, vrf_id);
 140
 141         return 0;
 142 }
 143
 144 static int route_notify_owner(ZAPI_CALLBACK_ARGS)
 145 {
 146         struct prefix p;
 147         enum zapi_route_notify_owner note;
 148         uint32_t table_id;
 149         char buf[PREFIX_STRLEN];
 150
 151         if (!zapi_route_notify_decode(zclient->ibuf, &p, &table_id, &note))
 152                 return -1;
 153
 154         prefix2str(&p, buf, sizeof(buf));
 155
 156         switch (note) {
 157         case ZAPI_ROUTE_FAIL_INSTALL:
 158                 zlog_warn("%s: Route %s failed to install for table: %u",
 159                           __PRETTY_FUNCTION__, buf, table_id);
 160                 break;
 161         case ZAPI_ROUTE_BETTER_ADMIN_WON:
 162                 zlog_warn("%s: Route %s over-ridden by better route for table: %u",
 163                           __PRETTY_FUNCTION__, buf, table_id);
 164                 break;
 165         case ZAPI_ROUTE_INSTALLED:
 166                 break;
 167         case ZAPI_ROUTE_REMOVED:
 168                 break;
 169         case ZAPI_ROUTE_REMOVE_FAIL:
 170                 zlog_warn("%s: Route %s failure to remove for table: %u",
 171                           __PRETTY_FUNCTION__, buf, table_id);
 172                 break;
 173         }
 174
 175         return 0;
 176 }
 177 static void zebra_connected(struct zclient *zclient)
 178 {
 179         zclient_send_reg_requests(zclient, VRF_DEFAULT);
 180 }
 181
 182 struct static_nht_data {
 183         struct prefix *nh;
 184
 185         vrf_id_t nh_vrf_id;
 186
 187         uint32_t refcount;
 188         uint8_t nh_num;
 189 };
 190
 191 static int static_zebra_nexthop_update(ZAPI_CALLBACK_ARGS)
 192 {
 193         struct static_nht_data *nhtd, lookup;
 194         struct zapi_route nhr;
 195         afi_t afi = AFI_IP;
 196
 197         if (!zapi_nexthop_update_decode(zclient->ibuf, &nhr)) {
 198                 zlog_warn("Failure to decode nexthop update message");
 199                 return 1;
 200         }
 201
 202         if (nhr.prefix.family == AF_INET6)
 203                 afi = AFI_IP6;
 204
 205         memset(&lookup, 0, sizeof(lookup));
 206         lookup.nh = &nhr.prefix;
 207         lookup.nh_vrf_id = vrf_id;
 208
 209         nhtd = hash_lookup(static_nht_hash, &lookup);
 210
 211         if (nhtd) {
 212                 nhtd->nh_num = nhr.nexthop_num;
 213
 214                 static_nht_update(&nhr.prefix, nhr.nexthop_num, afi,
 215                                   nhtd->nh_vrf_id);
 216         } else
 217                 zlog_err("No nhtd?");
 218
 219         return 1;
 220 }
 221
 222 static void static_zebra_capabilities(struct zclient_capabilities *cap)
 223 {
 224         mpls_enabled = cap->mpls_enabled;
 225 }
 226
 227 static unsigned int static_nht_hash_key(const void *data)
 228 {
 229         const struct static_nht_data *nhtd = data;
 230         unsigned int key = 0;
 231
 232         key = prefix_hash_key(nhtd->nh);
 233         return jhash_1word(nhtd->nh_vrf_id, key);
 234 }
 235
 236 static bool static_nht_hash_cmp(const void *d1, const void *d2)
 237 {
 238         const struct static_nht_data *nhtd1 = d1;
 239         const struct static_nht_data *nhtd2 = d2;
 240
 241         if (nhtd1->nh_vrf_id != nhtd2->nh_vrf_id)
 242                 return false;
 243
 244         return prefix_same(nhtd1->nh, nhtd2->nh);
 245 }
 246
 247 static void *static_nht_hash_alloc(void *data)
 248 {
 249         struct static_nht_data *copy = data;
 250         struct static_nht_data *new;
 251
 252         new = XMALLOC(MTYPE_TMP, sizeof(*new));
 253
 254         new->nh = prefix_new();
 255         prefix_copy(new->nh, copy->nh);
 256         new->refcount = 0;
 257         new->nh_num = 0;
 258         new->nh_vrf_id = copy->nh_vrf_id;
 259
 260         return new;
 261 }
 262
 263 static void static_nht_hash_free(void *data)
 264 {
 265         struct static_nht_data *nhtd = data;
 266
 267         prefix_free(nhtd->nh);
 268         XFREE(MTYPE_TMP, nhtd);
 269 }
 270
 271 void static_zebra_nht_register(struct static_route *si, bool reg)
 272 {
 273         struct static_nht_data *nhtd, lookup;
 274         uint32_t cmd;
 275         struct prefix p;
 276         afi_t afi = AFI_IP;
 277
 278         cmd = (reg) ?
 279                 ZEBRA_NEXTHOP_REGISTER : ZEBRA_NEXTHOP_UNREGISTER;
 280
 281         if (si->nh_registered && reg)
 282                 return;
 283
 284         if (!si->nh_registered && !reg)
 285                 return;
 286
 287         memset(&p, 0, sizeof(p));
 288         switch (si->type) {
 289         case STATIC_IFNAME:
 290         case STATIC_BLACKHOLE:
 291                 return;
 292         case STATIC_IPV4_GATEWAY:
 293         case STATIC_IPV4_GATEWAY_IFNAME:
 294                 p.family = AF_INET;
 295                 p.prefixlen = IPV4_MAX_BITLEN;
 296                 p.u.prefix4 = si->addr.ipv4;
 297                 afi = AFI_IP;
 298                 break;
 299         case STATIC_IPV6_GATEWAY:
 300         case STATIC_IPV6_GATEWAY_IFNAME:
 301                 p.family = AF_INET6;
 302                 p.prefixlen = IPV6_MAX_BITLEN;
 303                 p.u.prefix6 = si->addr.ipv6;
 304                 afi = AFI_IP6;
 305                 break;
 306         }
 307
 308         memset(&lookup, 0, sizeof(lookup));
 309         lookup.nh = &p;
 310         lookup.nh_vrf_id = si->nh_vrf_id;
 311
 312         si->nh_registered = reg;
 313
 314         if (reg) {
 315                 nhtd = hash_get(static_nht_hash, &lookup,
 316                                 static_nht_hash_alloc);
 317                 nhtd->refcount++;
 318
 319                 if (nhtd->refcount > 1) {
 320                         static_nht_update(nhtd->nh, nhtd->nh_num,
 321                                           afi, si->nh_vrf_id);
 322                         return;
 323                 }
 324         } else {
 325                 nhtd = hash_lookup(static_nht_hash, &lookup);
 326                 if (!nhtd)
 327                         return;
 328
 329                 nhtd->refcount--;
 330                 if (nhtd->refcount >= 1)
 331                         return;
 332
 333                 hash_release(static_nht_hash, nhtd);
 334                 static_nht_hash_free(nhtd);
 335         }
 336
 337         if (zclient_send_rnh(zclient, cmd, &p, false, si->nh_vrf_id) < 0)
 338                 zlog_warn("%s: Failure to send nexthop to zebra",
 339                           __PRETTY_FUNCTION__);
 340 }
 341
 342 extern void static_zebra_route_add(struct route_node *rn,
 343                                    struct static_route *si_changed,
 344                                    vrf_id_t vrf_id, safi_t safi, bool install)
 345 {
 346         struct static_route *si = rn->info;
 347         const struct prefix *p, *src_pp;
 348         struct zapi_nexthop *api_nh;
 349         struct zapi_route api;
 350         uint32_t nh_num = 0;
 351
 352         p = src_pp = NULL;
 353         srcdest_rnode_prefixes(rn, &p, &src_pp);
 354
 355         memset(&api, 0, sizeof(api));
 356         api.vrf_id = vrf_id;
 357         api.type = ZEBRA_ROUTE_STATIC;
 358         api.safi = safi;
 359         memcpy(&api.prefix, p, sizeof(api.prefix));
 360
 361         if (src_pp) {
 362                 SET_FLAG(api.message, ZAPI_MESSAGE_SRCPFX);
 363                 memcpy(&api.src_prefix, src_pp, sizeof(api.src_prefix));
 364         }
 365         SET_FLAG(api.flags, ZEBRA_FLAG_RR_USE_DISTANCE);
 366         SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
 367         if (si_changed->distance) {
 368                 SET_FLAG(api.message, ZAPI_MESSAGE_DISTANCE);
 369                 api.distance = si_changed->distance;
 370         }
 371         if (si_changed->tag) {
 372                 SET_FLAG(api.message, ZAPI_MESSAGE_TAG);
 373                 api.tag = si_changed->tag;
 374         }
 375         if (si_changed->table_id != 0) {
 376                 SET_FLAG(api.message, ZAPI_MESSAGE_TABLEID);
 377                 api.tableid = si_changed->table_id;
 378         }
 379         for (/*loaded above*/; si; si = si->next) {
 380                 api_nh = &api.nexthops[nh_num];
 381                 if (si->nh_vrf_id == VRF_UNKNOWN)
 382                         continue;
 383
 384                 if (si->distance != si_changed->distance)
 385                         continue;
 386
 387                 if (si->table_id != si_changed->table_id)
 388                         continue;
 389
 390                 api_nh->vrf_id = si->nh_vrf_id;
 391                 api_nh->onlink = si->onlink;
 392
 393                 switch (si->type) {
 394                 case STATIC_IFNAME:
 395                         if (si->ifindex == IFINDEX_INTERNAL)
 396                                 continue;
 397                         api_nh->ifindex = si->ifindex;
 398                         api_nh->type = NEXTHOP_TYPE_IFINDEX;
 399                         break;
 400                 case STATIC_IPV4_GATEWAY:
 401                         if (!si->nh_valid)
 402                                 continue;
 403                         api_nh->type = NEXTHOP_TYPE_IPV4;
 404                         api_nh->gate = si->addr;
 405                         break;
 406                 case STATIC_IPV4_GATEWAY_IFNAME:
 407                         if (si->ifindex == IFINDEX_INTERNAL)
 408                                 continue;
 409                         api_nh->ifindex = si->ifindex;
 410                         api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX;
 411                         api_nh->gate = si->addr;
 412                         break;
 413                 case STATIC_IPV6_GATEWAY:
 414                         if (!si->nh_valid)
 415                                 continue;
 416                         api_nh->type = NEXTHOP_TYPE_IPV6;
 417                         api_nh->gate = si->addr;
 418                         break;
 419                 case STATIC_IPV6_GATEWAY_IFNAME:
 420                         if (si->ifindex == IFINDEX_INTERNAL)
 421                                 continue;
 422                         api_nh->type = NEXTHOP_TYPE_IPV6_IFINDEX;
 423                         api_nh->ifindex = si->ifindex;
 424                         api_nh->gate = si->addr;
 425                         break;
 426                 case STATIC_BLACKHOLE:
 427                         api_nh->type = NEXTHOP_TYPE_BLACKHOLE;
 428                         switch (si->bh_type) {
 429                         case STATIC_BLACKHOLE_DROP:
 430                         case STATIC_BLACKHOLE_NULL:
 431                                 api_nh->bh_type = BLACKHOLE_NULL;
 432                                 break;
 433                         case STATIC_BLACKHOLE_REJECT:
 434                                 api_nh->bh_type = BLACKHOLE_REJECT;
 435                         }
 436                         break;
 437                 }
 438
 439                 if (si->snh_label.num_labels) {
 440                         int i;
 441
 442                         SET_FLAG(api.message, ZAPI_MESSAGE_LABEL);
 443                         api_nh->label_num = si->snh_label.num_labels;
 444                         for (i = 0; i < api_nh->label_num; i++)
 445                                 api_nh->labels[i] = si->snh_label.label[i];
 446                 }
 447                 nh_num++;
 448         }
 449
 450         api.nexthop_num = nh_num;
 451
 452         /*
 453          * If we have been given an install but nothing is valid
 454          * go ahead and delete the route for double plus fun
 455          */
 456         if (!nh_num && install)
 457                 install = false;
 458
 459         zclient_route_send(install ?
 460                            ZEBRA_ROUTE_ADD : ZEBRA_ROUTE_DELETE,
 461                            zclient, &api);
 462 }
 463 void static_zebra_init(void)
 464 {
 465         struct zclient_options opt = { .receive_notify = true };
 466
 467         zclient = zclient_new(master, &opt);
 468
 469         zclient_init(zclient, ZEBRA_ROUTE_STATIC, 0, &static_privs);
 470         zclient->zebra_capabilities = static_zebra_capabilities;
 471         zclient->zebra_connected = zebra_connected;
 472         zclient->interface_add = interface_add;
 473         zclient->interface_delete = interface_delete;
 474         zclient->interface_up = interface_state_up;
 475         zclient->interface_down = interface_state_down;
 476         zclient->interface_address_add = interface_address_add;
 477         zclient->interface_address_delete = interface_address_delete;
 478         zclient->route_notify_owner = route_notify_owner;
 479         zclient->nexthop_update = static_zebra_nexthop_update;
 480
 481         static_nht_hash = hash_create(static_nht_hash_key,
 482                                       static_nht_hash_cmp,
 483                                       "Static Nexthop Tracking hash");
 484 }