drivers/net/netdevsim/fib.c

   1 /*
   2  * Copyright (c) 2018 Cumulus Networks. All rights reserved.
   3  * Copyright (c) 2018 David Ahern <dsa@cumulusnetworks.com>
   4  *
   5  * This software is licensed under the GNU General License Version 2,
   6  * June 1991 as shown in the file COPYING in the top-level directory of this
   7  * source tree.
   8  *
   9  * THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS"
  10  * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
  11  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  12  * FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE
  13  * OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME
  14  * THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
  15  */
  16
  17 #include <linux/in6.h>
  18 #include <linux/kernel.h>
  19 #include <linux/list.h>
  20 #include <linux/rhashtable.h>
  21 #include <linux/spinlock_types.h>
  22 #include <linux/types.h>
  23 #include <net/fib_notifier.h>
  24 #include <net/ip_fib.h>
  25 #include <net/ip6_fib.h>
  26 #include <net/fib_rules.h>
  27 #include <net/net_namespace.h>
  28
  29 #include "netdevsim.h"
  30
  31 struct nsim_fib_entry {
  32         u64 max;
  33         u64 num;
  34 };
  35
  36 struct nsim_per_fib_data {
  37         struct nsim_fib_entry fib;
  38         struct nsim_fib_entry rules;
  39 };
  40
  41 struct nsim_fib_data {
  42         struct notifier_block fib_nb;
  43         struct nsim_per_fib_data ipv4;
  44         struct nsim_per_fib_data ipv6;
  45         struct rhashtable fib_rt_ht;
  46         struct list_head fib_rt_list;
  47         spinlock_t fib_lock;    /* Protects hashtable, list and accounting */
  48         struct devlink *devlink;
  49 };
  50
  51 struct nsim_fib_rt_key {
  52         unsigned char addr[sizeof(struct in6_addr)];
  53         unsigned char prefix_len;
  54         int family;
  55         u32 tb_id;
  56 };
  57
  58 struct nsim_fib_rt {
  59         struct nsim_fib_rt_key key;
  60         struct rhash_head ht_node;
  61         struct list_head list;  /* Member of fib_rt_list */
  62 };
  63
  64 struct nsim_fib4_rt {
  65         struct nsim_fib_rt common;
  66         struct fib_info *fi;
  67         u8 tos;
  68         u8 type;
  69 };
  70
  71 struct nsim_fib6_rt {
  72         struct nsim_fib_rt common;
  73         struct list_head nh_list;
  74         unsigned int nhs;
  75 };
  76
  77 struct nsim_fib6_rt_nh {
  78         struct list_head list;  /* Member of nh_list */
  79         struct fib6_info *rt;
  80 };
  81
  82 static const struct rhashtable_params nsim_fib_rt_ht_params = {
  83         .key_offset = offsetof(struct nsim_fib_rt, key),
  84         .head_offset = offsetof(struct nsim_fib_rt, ht_node),
  85         .key_len = sizeof(struct nsim_fib_rt_key),
  86         .automatic_shrinking = true,
  87 };
  88
  89 u64 nsim_fib_get_val(struct nsim_fib_data *fib_data,
  90                      enum nsim_resource_id res_id, bool max)
  91 {
  92         struct nsim_fib_entry *entry;
  93
  94         switch (res_id) {
  95         case NSIM_RESOURCE_IPV4_FIB:
  96                 entry = &fib_data->ipv4.fib;
  97                 break;
  98         case NSIM_RESOURCE_IPV4_FIB_RULES:
  99                 entry = &fib_data->ipv4.rules;
 100                 break;
 101         case NSIM_RESOURCE_IPV6_FIB:
 102                 entry = &fib_data->ipv6.fib;
 103                 break;
 104         case NSIM_RESOURCE_IPV6_FIB_RULES:
 105                 entry = &fib_data->ipv6.rules;
 106                 break;
 107         default:
 108                 return 0;
 109         }
 110
 111         return max ? entry->max : entry->num;
 112 }
 113
 114 static void nsim_fib_set_max(struct nsim_fib_data *fib_data,
 115                              enum nsim_resource_id res_id, u64 val)
 116 {
 117         struct nsim_fib_entry *entry;
 118
 119         switch (res_id) {
 120         case NSIM_RESOURCE_IPV4_FIB:
 121                 entry = &fib_data->ipv4.fib;
 122                 break;
 123         case NSIM_RESOURCE_IPV4_FIB_RULES:
 124                 entry = &fib_data->ipv4.rules;
 125                 break;
 126         case NSIM_RESOURCE_IPV6_FIB:
 127                 entry = &fib_data->ipv6.fib;
 128                 break;
 129         case NSIM_RESOURCE_IPV6_FIB_RULES:
 130                 entry = &fib_data->ipv6.rules;
 131                 break;
 132         default:
 133                 WARN_ON(1);
 134                 return;
 135         }
 136         entry->max = val;
 137 }
 138
 139 static int nsim_fib_rule_account(struct nsim_fib_entry *entry, bool add,
 140                                  struct netlink_ext_ack *extack)
 141 {
 142         int err = 0;
 143
 144         if (add) {
 145                 if (entry->num < entry->max) {
 146                         entry->num++;
 147                 } else {
 148                         err = -ENOSPC;
 149                         NL_SET_ERR_MSG_MOD(extack, "Exceeded number of supported fib rule entries");
 150                 }
 151         } else {
 152                 entry->num--;
 153         }
 154
 155         return err;
 156 }
 157
 158 static int nsim_fib_rule_event(struct nsim_fib_data *data,
 159                                struct fib_notifier_info *info, bool add)
 160 {
 161         struct netlink_ext_ack *extack = info->extack;
 162         int err = 0;
 163
 164         switch (info->family) {
 165         case AF_INET:
 166                 err = nsim_fib_rule_account(&data->ipv4.rules, add, extack);
 167                 break;
 168         case AF_INET6:
 169                 err = nsim_fib_rule_account(&data->ipv6.rules, add, extack);
 170                 break;
 171         }
 172
 173         return err;
 174 }
 175
 176 static int nsim_fib_account(struct nsim_fib_entry *entry, bool add,
 177                             struct netlink_ext_ack *extack)
 178 {
 179         int err = 0;
 180
 181         if (add) {
 182                 if (entry->num < entry->max) {
 183                         entry->num++;
 184                 } else {
 185                         err = -ENOSPC;
 186                         NL_SET_ERR_MSG_MOD(extack, "Exceeded number of supported fib entries");
 187                 }
 188         } else {
 189                 entry->num--;
 190         }
 191
 192         return err;
 193 }
 194
 195 static void nsim_fib_rt_init(struct nsim_fib_data *data,
 196                              struct nsim_fib_rt *fib_rt, const void *addr,
 197                              size_t addr_len, unsigned int prefix_len,
 198                              int family, u32 tb_id)
 199 {
 200         memcpy(fib_rt->key.addr, addr, addr_len);
 201         fib_rt->key.prefix_len = prefix_len;
 202         fib_rt->key.family = family;
 203         fib_rt->key.tb_id = tb_id;
 204         list_add(&fib_rt->list, &data->fib_rt_list);
 205 }
 206
 207 static void nsim_fib_rt_fini(struct nsim_fib_rt *fib_rt)
 208 {
 209         list_del(&fib_rt->list);
 210 }
 211
 212 static struct nsim_fib_rt *nsim_fib_rt_lookup(struct rhashtable *fib_rt_ht,
 213                                               const void *addr, size_t addr_len,
 214                                               unsigned int prefix_len,
 215                                               int family, u32 tb_id)
 216 {
 217         struct nsim_fib_rt_key key;
 218
 219         memset(&key, 0, sizeof(key));
 220         memcpy(key.addr, addr, addr_len);
 221         key.prefix_len = prefix_len;
 222         key.family = family;
 223         key.tb_id = tb_id;
 224
 225         return rhashtable_lookup_fast(fib_rt_ht, &key, nsim_fib_rt_ht_params);
 226 }
 227
 228 static struct nsim_fib4_rt *
 229 nsim_fib4_rt_create(struct nsim_fib_data *data,
 230                     struct fib_entry_notifier_info *fen_info)
 231 {
 232         struct nsim_fib4_rt *fib4_rt;
 233
 234         fib4_rt = kzalloc(sizeof(*fib4_rt), GFP_ATOMIC);
 235         if (!fib4_rt)
 236                 return NULL;
 237
 238         nsim_fib_rt_init(data, &fib4_rt->common, &fen_info->dst, sizeof(u32),
 239                          fen_info->dst_len, AF_INET, fen_info->tb_id);
 240
 241         fib4_rt->fi = fen_info->fi;
 242         fib_info_hold(fib4_rt->fi);
 243         fib4_rt->tos = fen_info->tos;
 244         fib4_rt->type = fen_info->type;
 245
 246         return fib4_rt;
 247 }
 248
 249 static void nsim_fib4_rt_destroy(struct nsim_fib4_rt *fib4_rt)
 250 {
 251         fib_info_put(fib4_rt->fi);
 252         nsim_fib_rt_fini(&fib4_rt->common);
 253         kfree(fib4_rt);
 254 }
 255
 256 static struct nsim_fib4_rt *
 257 nsim_fib4_rt_lookup(struct rhashtable *fib_rt_ht,
 258                     const struct fib_entry_notifier_info *fen_info)
 259 {
 260         struct nsim_fib_rt *fib_rt;
 261
 262         fib_rt = nsim_fib_rt_lookup(fib_rt_ht, &fen_info->dst, sizeof(u32),
 263                                     fen_info->dst_len, AF_INET,
 264                                     fen_info->tb_id);
 265         if (!fib_rt)
 266                 return NULL;
 267
 268         return container_of(fib_rt, struct nsim_fib4_rt, common);
 269 }
 270
 271 static void nsim_fib4_rt_hw_flags_set(struct net *net,
 272                                       const struct nsim_fib4_rt *fib4_rt,
 273                                       bool trap)
 274 {
 275         u32 *p_dst = (u32 *) fib4_rt->common.key.addr;
 276         int dst_len = fib4_rt->common.key.prefix_len;
 277         struct fib_rt_info fri;
 278
 279         fri.fi = fib4_rt->fi;
 280         fri.tb_id = fib4_rt->common.key.tb_id;
 281         fri.dst = cpu_to_be32(*p_dst);
 282         fri.dst_len = dst_len;
 283         fri.tos = fib4_rt->tos;
 284         fri.type = fib4_rt->type;
 285         fri.offload = false;
 286         fri.trap = trap;
 287         fib_alias_hw_flags_set(net, &fri);
 288 }
 289
 290 static int nsim_fib4_rt_add(struct nsim_fib_data *data,
 291                             struct nsim_fib4_rt *fib4_rt,
 292                             struct netlink_ext_ack *extack)
 293 {
 294         struct net *net = devlink_net(data->devlink);
 295         int err;
 296
 297         err = nsim_fib_account(&data->ipv4.fib, true, extack);
 298         if (err)
 299                 return err;
 300
 301         err = rhashtable_insert_fast(&data->fib_rt_ht,
 302                                      &fib4_rt->common.ht_node,
 303                                      nsim_fib_rt_ht_params);
 304         if (err) {
 305                 NL_SET_ERR_MSG_MOD(extack, "Failed to insert IPv4 route");
 306                 goto err_fib_dismiss;
 307         }
 308
 309         nsim_fib4_rt_hw_flags_set(net, fib4_rt, true);
 310
 311         return 0;
 312
 313 err_fib_dismiss:
 314         nsim_fib_account(&data->ipv4.fib, false, extack);
 315         return err;
 316 }
 317
 318 static int nsim_fib4_rt_replace(struct nsim_fib_data *data,
 319                                 struct nsim_fib4_rt *fib4_rt,
 320                                 struct nsim_fib4_rt *fib4_rt_old,
 321                                 struct netlink_ext_ack *extack)
 322 {
 323         struct net *net = devlink_net(data->devlink);
 324         int err;
 325
 326         /* We are replacing a route, so no need to change the accounting. */
 327         err = rhashtable_replace_fast(&data->fib_rt_ht,
 328                                       &fib4_rt_old->common.ht_node,
 329                                       &fib4_rt->common.ht_node,
 330                                       nsim_fib_rt_ht_params);
 331         if (err) {
 332                 NL_SET_ERR_MSG_MOD(extack, "Failed to replace IPv4 route");
 333                 return err;
 334         }
 335
 336         nsim_fib4_rt_hw_flags_set(net, fib4_rt, true);
 337
 338         nsim_fib4_rt_hw_flags_set(net, fib4_rt_old, false);
 339         nsim_fib4_rt_destroy(fib4_rt_old);
 340
 341         return 0;
 342 }
 343
 344 static int nsim_fib4_rt_insert(struct nsim_fib_data *data,
 345                                struct fib_entry_notifier_info *fen_info)
 346 {
 347         struct netlink_ext_ack *extack = fen_info->info.extack;
 348         struct nsim_fib4_rt *fib4_rt, *fib4_rt_old;
 349         int err;
 350
 351         fib4_rt = nsim_fib4_rt_create(data, fen_info);
 352         if (!fib4_rt)
 353                 return -ENOMEM;
 354
 355         fib4_rt_old = nsim_fib4_rt_lookup(&data->fib_rt_ht, fen_info);
 356         if (!fib4_rt_old)
 357                 err = nsim_fib4_rt_add(data, fib4_rt, extack);
 358         else
 359                 err = nsim_fib4_rt_replace(data, fib4_rt, fib4_rt_old, extack);
 360
 361         if (err)
 362                 nsim_fib4_rt_destroy(fib4_rt);
 363
 364         return err;
 365 }
 366
 367 static void nsim_fib4_rt_remove(struct nsim_fib_data *data,
 368                                 const struct fib_entry_notifier_info *fen_info)
 369 {
 370         struct netlink_ext_ack *extack = fen_info->info.extack;
 371         struct nsim_fib4_rt *fib4_rt;
 372
 373         fib4_rt = nsim_fib4_rt_lookup(&data->fib_rt_ht, fen_info);
 374         if (WARN_ON_ONCE(!fib4_rt))
 375                 return;
 376
 377         rhashtable_remove_fast(&data->fib_rt_ht, &fib4_rt->common.ht_node,
 378                                nsim_fib_rt_ht_params);
 379         nsim_fib_account(&data->ipv4.fib, false, extack);
 380         nsim_fib4_rt_destroy(fib4_rt);
 381 }
 382
 383 static int nsim_fib4_event(struct nsim_fib_data *data,
 384                            struct fib_notifier_info *info,
 385                            unsigned long event)
 386 {
 387         struct fib_entry_notifier_info *fen_info;
 388         int err = 0;
 389
 390         fen_info = container_of(info, struct fib_entry_notifier_info, info);
 391
 392         if (fen_info->fi->nh) {
 393                 NL_SET_ERR_MSG_MOD(info->extack, "IPv4 route with nexthop objects is not supported");
 394                 return 0;
 395         }
 396
 397         switch (event) {
 398         case FIB_EVENT_ENTRY_REPLACE:
 399                 err = nsim_fib4_rt_insert(data, fen_info);
 400                 break;
 401         case FIB_EVENT_ENTRY_DEL:
 402                 nsim_fib4_rt_remove(data, fen_info);
 403                 break;
 404         default:
 405                 break;
 406         }
 407
 408         return err;
 409 }
 410
 411 static struct nsim_fib6_rt_nh *
 412 nsim_fib6_rt_nh_find(const struct nsim_fib6_rt *fib6_rt,
 413                      const struct fib6_info *rt)
 414 {
 415         struct nsim_fib6_rt_nh *fib6_rt_nh;
 416
 417         list_for_each_entry(fib6_rt_nh, &fib6_rt->nh_list, list) {
 418                 if (fib6_rt_nh->rt == rt)
 419                         return fib6_rt_nh;
 420         }
 421
 422         return NULL;
 423 }
 424
 425 static int nsim_fib6_rt_nh_add(struct nsim_fib6_rt *fib6_rt,
 426                                struct fib6_info *rt)
 427 {
 428         struct nsim_fib6_rt_nh *fib6_rt_nh;
 429
 430         fib6_rt_nh = kzalloc(sizeof(*fib6_rt_nh), GFP_ATOMIC);
 431         if (!fib6_rt_nh)
 432                 return -ENOMEM;
 433
 434         fib6_info_hold(rt);
 435         fib6_rt_nh->rt = rt;
 436         list_add_tail(&fib6_rt_nh->list, &fib6_rt->nh_list);
 437         fib6_rt->nhs++;
 438
 439         return 0;
 440 }
 441
 442 static void nsim_fib6_rt_nh_del(struct nsim_fib6_rt *fib6_rt,
 443                                 const struct fib6_info *rt)
 444 {
 445         struct nsim_fib6_rt_nh *fib6_rt_nh;
 446
 447         fib6_rt_nh = nsim_fib6_rt_nh_find(fib6_rt, rt);
 448         if (WARN_ON_ONCE(!fib6_rt_nh))
 449                 return;
 450
 451         fib6_rt->nhs--;
 452         list_del(&fib6_rt_nh->list);
 453 #if IS_ENABLED(CONFIG_IPV6)
 454         fib6_info_release(fib6_rt_nh->rt);
 455 #endif
 456         kfree(fib6_rt_nh);
 457 }
 458
 459 static struct nsim_fib6_rt *
 460 nsim_fib6_rt_create(struct nsim_fib_data *data,
 461                     struct fib6_entry_notifier_info *fen6_info)
 462 {
 463         struct fib6_info *iter, *rt = fen6_info->rt;
 464         struct nsim_fib6_rt *fib6_rt;
 465         int i = 0;
 466         int err;
 467
 468         fib6_rt = kzalloc(sizeof(*fib6_rt), GFP_ATOMIC);
 469         if (!fib6_rt)
 470                 return ERR_PTR(-ENOMEM);
 471
 472         nsim_fib_rt_init(data, &fib6_rt->common, &rt->fib6_dst.addr,
 473                          sizeof(rt->fib6_dst.addr), rt->fib6_dst.plen, AF_INET6,
 474                          rt->fib6_table->tb6_id);
 475
 476         /* We consider a multipath IPv6 route as one entry, but it can be made
 477          * up from several fib6_info structs (one for each nexthop), so we
 478          * add them all to the same list under the entry.
 479          */
 480         INIT_LIST_HEAD(&fib6_rt->nh_list);
 481
 482         err = nsim_fib6_rt_nh_add(fib6_rt, rt);
 483         if (err)
 484                 goto err_fib_rt_fini;
 485
 486         if (!fen6_info->nsiblings)
 487                 return fib6_rt;
 488
 489         list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) {
 490                 if (i == fen6_info->nsiblings)
 491                         break;
 492
 493                 err = nsim_fib6_rt_nh_add(fib6_rt, iter);
 494                 if (err)
 495                         goto err_fib6_rt_nh_del;
 496                 i++;
 497         }
 498         WARN_ON_ONCE(i != fen6_info->nsiblings);
 499
 500         return fib6_rt;
 501
 502 err_fib6_rt_nh_del:
 503         list_for_each_entry_continue_reverse(iter, &rt->fib6_siblings,
 504                                              fib6_siblings)
 505                 nsim_fib6_rt_nh_del(fib6_rt, iter);
 506         nsim_fib6_rt_nh_del(fib6_rt, rt);
 507 err_fib_rt_fini:
 508         nsim_fib_rt_fini(&fib6_rt->common);
 509         kfree(fib6_rt);
 510         return ERR_PTR(err);
 511 }
 512
 513 static void nsim_fib6_rt_destroy(struct nsim_fib6_rt *fib6_rt)
 514 {
 515         struct nsim_fib6_rt_nh *iter, *tmp;
 516
 517         list_for_each_entry_safe(iter, tmp, &fib6_rt->nh_list, list)
 518                 nsim_fib6_rt_nh_del(fib6_rt, iter->rt);
 519         WARN_ON_ONCE(!list_empty(&fib6_rt->nh_list));
 520         nsim_fib_rt_fini(&fib6_rt->common);
 521         kfree(fib6_rt);
 522 }
 523
 524 static struct nsim_fib6_rt *
 525 nsim_fib6_rt_lookup(struct rhashtable *fib_rt_ht, const struct fib6_info *rt)
 526 {
 527         struct nsim_fib_rt *fib_rt;
 528
 529         fib_rt = nsim_fib_rt_lookup(fib_rt_ht, &rt->fib6_dst.addr,
 530                                     sizeof(rt->fib6_dst.addr),
 531                                     rt->fib6_dst.plen, AF_INET6,
 532                                     rt->fib6_table->tb6_id);
 533         if (!fib_rt)
 534                 return NULL;
 535
 536         return container_of(fib_rt, struct nsim_fib6_rt, common);
 537 }
 538
 539 static int nsim_fib6_rt_append(struct nsim_fib_data *data,
 540                                struct fib6_entry_notifier_info *fen6_info)
 541 {
 542         struct fib6_info *iter, *rt = fen6_info->rt;
 543         struct nsim_fib6_rt *fib6_rt;
 544         int i = 0;
 545         int err;
 546
 547         fib6_rt = nsim_fib6_rt_lookup(&data->fib_rt_ht, rt);
 548         if (WARN_ON_ONCE(!fib6_rt))
 549                 return -EINVAL;
 550
 551         err = nsim_fib6_rt_nh_add(fib6_rt, rt);
 552         if (err)
 553                 return err;
 554         rt->trap = true;
 555
 556         if (!fen6_info->nsiblings)
 557                 return 0;
 558
 559         list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) {
 560                 if (i == fen6_info->nsiblings)
 561                         break;
 562
 563                 err = nsim_fib6_rt_nh_add(fib6_rt, iter);
 564                 if (err)
 565                         goto err_fib6_rt_nh_del;
 566                 iter->trap = true;
 567                 i++;
 568         }
 569         WARN_ON_ONCE(i != fen6_info->nsiblings);
 570
 571         return 0;
 572
 573 err_fib6_rt_nh_del:
 574         list_for_each_entry_continue_reverse(iter, &rt->fib6_siblings,
 575                                              fib6_siblings) {
 576                 iter->trap = false;
 577                 nsim_fib6_rt_nh_del(fib6_rt, iter);
 578         }
 579         rt->trap = false;
 580         nsim_fib6_rt_nh_del(fib6_rt, rt);
 581         return err;
 582 }
 583
 584 static void nsim_fib6_rt_hw_flags_set(const struct nsim_fib6_rt *fib6_rt,
 585                                       bool trap)
 586 {
 587         struct nsim_fib6_rt_nh *fib6_rt_nh;
 588
 589         list_for_each_entry(fib6_rt_nh, &fib6_rt->nh_list, list)
 590                 fib6_info_hw_flags_set(fib6_rt_nh->rt, false, trap);
 591 }
 592
 593 static int nsim_fib6_rt_add(struct nsim_fib_data *data,
 594                             struct nsim_fib6_rt *fib6_rt,
 595                             struct netlink_ext_ack *extack)
 596 {
 597         int err;
 598
 599         err = nsim_fib_account(&data->ipv6.fib, true, extack);
 600         if (err)
 601                 return err;
 602
 603         err = rhashtable_insert_fast(&data->fib_rt_ht,
 604                                      &fib6_rt->common.ht_node,
 605                                      nsim_fib_rt_ht_params);
 606         if (err) {
 607                 NL_SET_ERR_MSG_MOD(extack, "Failed to insert IPv6 route");
 608                 goto err_fib_dismiss;
 609         }
 610
 611         nsim_fib6_rt_hw_flags_set(fib6_rt, true);
 612
 613         return 0;
 614
 615 err_fib_dismiss:
 616         nsim_fib_account(&data->ipv6.fib, false, extack);
 617         return err;
 618 }
 619
 620 static int nsim_fib6_rt_replace(struct nsim_fib_data *data,
 621                                 struct nsim_fib6_rt *fib6_rt,
 622                                 struct nsim_fib6_rt *fib6_rt_old,
 623                                 struct netlink_ext_ack *extack)
 624 {
 625         int err;
 626
 627         /* We are replacing a route, so no need to change the accounting. */
 628         err = rhashtable_replace_fast(&data->fib_rt_ht,
 629                                       &fib6_rt_old->common.ht_node,
 630                                       &fib6_rt->common.ht_node,
 631                                       nsim_fib_rt_ht_params);
 632         if (err) {
 633                 NL_SET_ERR_MSG_MOD(extack, "Failed to replace IPv6 route");
 634                 return err;
 635         }
 636
 637         nsim_fib6_rt_hw_flags_set(fib6_rt, true);
 638
 639         nsim_fib6_rt_hw_flags_set(fib6_rt_old, false);
 640         nsim_fib6_rt_destroy(fib6_rt_old);
 641
 642         return 0;
 643 }
 644
 645 static int nsim_fib6_rt_insert(struct nsim_fib_data *data,
 646                                struct fib6_entry_notifier_info *fen6_info)
 647 {
 648         struct netlink_ext_ack *extack = fen6_info->info.extack;
 649         struct nsim_fib6_rt *fib6_rt, *fib6_rt_old;
 650         int err;
 651
 652         fib6_rt = nsim_fib6_rt_create(data, fen6_info);
 653         if (IS_ERR(fib6_rt))
 654                 return PTR_ERR(fib6_rt);
 655
 656         fib6_rt_old = nsim_fib6_rt_lookup(&data->fib_rt_ht, fen6_info->rt);
 657         if (!fib6_rt_old)
 658                 err = nsim_fib6_rt_add(data, fib6_rt, extack);
 659         else
 660                 err = nsim_fib6_rt_replace(data, fib6_rt, fib6_rt_old, extack);
 661
 662         if (err)
 663                 nsim_fib6_rt_destroy(fib6_rt);
 664
 665         return err;
 666 }
 667
 668 static void
 669 nsim_fib6_rt_remove(struct nsim_fib_data *data,
 670                     const struct fib6_entry_notifier_info *fen6_info)
 671 {
 672         struct netlink_ext_ack *extack = fen6_info->info.extack;
 673         struct nsim_fib6_rt *fib6_rt;
 674
 675         /* Multipath routes are first added to the FIB trie and only then
 676          * notified. If we vetoed the addition, we will get a delete
 677          * notification for a route we do not have. Therefore, do not warn if
 678          * route was not found.
 679          */
 680         fib6_rt = nsim_fib6_rt_lookup(&data->fib_rt_ht, fen6_info->rt);
 681         if (!fib6_rt)
 682                 return;
 683
 684         /* If not all the nexthops are deleted, then only reduce the nexthop
 685          * group.
 686          */
 687         if (fen6_info->nsiblings + 1 != fib6_rt->nhs) {
 688                 nsim_fib6_rt_nh_del(fib6_rt, fen6_info->rt);
 689                 return;
 690         }
 691
 692         rhashtable_remove_fast(&data->fib_rt_ht, &fib6_rt->common.ht_node,
 693                                nsim_fib_rt_ht_params);
 694         nsim_fib_account(&data->ipv6.fib, false, extack);
 695         nsim_fib6_rt_destroy(fib6_rt);
 696 }
 697
 698 static int nsim_fib6_event(struct nsim_fib_data *data,
 699                            struct fib_notifier_info *info,
 700                            unsigned long event)
 701 {
 702         struct fib6_entry_notifier_info *fen6_info;
 703         int err = 0;
 704
 705         fen6_info = container_of(info, struct fib6_entry_notifier_info, info);
 706
 707         if (fen6_info->rt->nh) {
 708                 NL_SET_ERR_MSG_MOD(info->extack, "IPv6 route with nexthop objects is not supported");
 709                 return 0;
 710         }
 711
 712         if (fen6_info->rt->fib6_src.plen) {
 713                 NL_SET_ERR_MSG_MOD(info->extack, "IPv6 source-specific route is not supported");
 714                 return 0;
 715         }
 716
 717         switch (event) {
 718         case FIB_EVENT_ENTRY_REPLACE:
 719                 err = nsim_fib6_rt_insert(data, fen6_info);
 720                 break;
 721         case FIB_EVENT_ENTRY_APPEND:
 722                 err = nsim_fib6_rt_append(data, fen6_info);
 723                 break;
 724         case FIB_EVENT_ENTRY_DEL:
 725                 nsim_fib6_rt_remove(data, fen6_info);
 726                 break;
 727         default:
 728                 break;
 729         }
 730
 731         return err;
 732 }
 733
 734 static int nsim_fib_event(struct nsim_fib_data *data,
 735                           struct fib_notifier_info *info, unsigned long event)
 736 {
 737         int err = 0;
 738
 739         switch (info->family) {
 740         case AF_INET:
 741                 err = nsim_fib4_event(data, info, event);
 742                 break;
 743         case AF_INET6:
 744                 err = nsim_fib6_event(data, info, event);
 745                 break;
 746         }
 747
 748         return err;
 749 }
 750
 751 static int nsim_fib_event_nb(struct notifier_block *nb, unsigned long event,
 752                              void *ptr)
 753 {
 754         struct nsim_fib_data *data = container_of(nb, struct nsim_fib_data,
 755                                                   fib_nb);
 756         struct fib_notifier_info *info = ptr;
 757         int err = 0;
 758
 759         /* IPv6 routes can be added via RAs from softIRQ. */
 760         spin_lock_bh(&data->fib_lock);
 761
 762         switch (event) {
 763         case FIB_EVENT_RULE_ADD: /* fall through */
 764         case FIB_EVENT_RULE_DEL:
 765                 err = nsim_fib_rule_event(data, info,
 766                                           event == FIB_EVENT_RULE_ADD);
 767                 break;
 768
 769         case FIB_EVENT_ENTRY_REPLACE:  /* fall through */
 770         case FIB_EVENT_ENTRY_APPEND:  /* fall through */
 771         case FIB_EVENT_ENTRY_DEL:
 772                 err = nsim_fib_event(data, info, event);
 773                 break;
 774         }
 775
 776         spin_unlock_bh(&data->fib_lock);
 777
 778         return notifier_from_errno(err);
 779 }
 780
 781 static void nsim_fib4_rt_free(struct nsim_fib_rt *fib_rt,
 782                               struct nsim_fib_data *data)
 783 {
 784         struct devlink *devlink = data->devlink;
 785         struct nsim_fib4_rt *fib4_rt;
 786
 787         fib4_rt = container_of(fib_rt, struct nsim_fib4_rt, common);
 788         nsim_fib4_rt_hw_flags_set(devlink_net(devlink), fib4_rt, false);
 789         nsim_fib_account(&data->ipv4.fib, false, NULL);
 790         nsim_fib4_rt_destroy(fib4_rt);
 791 }
 792
 793 static void nsim_fib6_rt_free(struct nsim_fib_rt *fib_rt,
 794                               struct nsim_fib_data *data)
 795 {
 796         struct nsim_fib6_rt *fib6_rt;
 797
 798         fib6_rt = container_of(fib_rt, struct nsim_fib6_rt, common);
 799         nsim_fib6_rt_hw_flags_set(fib6_rt, false);
 800         nsim_fib_account(&data->ipv6.fib, false, NULL);
 801         nsim_fib6_rt_destroy(fib6_rt);
 802 }
 803
 804 static void nsim_fib_rt_free(void *ptr, void *arg)
 805 {
 806         struct nsim_fib_rt *fib_rt = ptr;
 807         struct nsim_fib_data *data = arg;
 808
 809         switch (fib_rt->key.family) {
 810         case AF_INET:
 811                 nsim_fib4_rt_free(fib_rt, data);
 812                 break;
 813         case AF_INET6:
 814                 nsim_fib6_rt_free(fib_rt, data);
 815                 break;
 816         default:
 817                 WARN_ON_ONCE(1);
 818         }
 819 }
 820
 821 /* inconsistent dump, trying again */
 822 static void nsim_fib_dump_inconsistent(struct notifier_block *nb)
 823 {
 824         struct nsim_fib_data *data = container_of(nb, struct nsim_fib_data,
 825                                                   fib_nb);
 826         struct nsim_fib_rt *fib_rt, *fib_rt_tmp;
 827
 828         /* The notifier block is still not registered, so we do not need to
 829          * take any locks here.
 830          */
 831         list_for_each_entry_safe(fib_rt, fib_rt_tmp, &data->fib_rt_list, list) {
 832                 rhashtable_remove_fast(&data->fib_rt_ht, &fib_rt->ht_node,
 833                                        nsim_fib_rt_ht_params);
 834                 nsim_fib_rt_free(fib_rt, data);
 835         }
 836
 837         data->ipv4.rules.num = 0ULL;
 838         data->ipv6.rules.num = 0ULL;
 839 }
 840
 841 static u64 nsim_fib_ipv4_resource_occ_get(void *priv)
 842 {
 843         struct nsim_fib_data *data = priv;
 844
 845         return nsim_fib_get_val(data, NSIM_RESOURCE_IPV4_FIB, false);
 846 }
 847
 848 static u64 nsim_fib_ipv4_rules_res_occ_get(void *priv)
 849 {
 850         struct nsim_fib_data *data = priv;
 851
 852         return nsim_fib_get_val(data, NSIM_RESOURCE_IPV4_FIB_RULES, false);
 853 }
 854
 855 static u64 nsim_fib_ipv6_resource_occ_get(void *priv)
 856 {
 857         struct nsim_fib_data *data = priv;
 858
 859         return nsim_fib_get_val(data, NSIM_RESOURCE_IPV6_FIB, false);
 860 }
 861
 862 static u64 nsim_fib_ipv6_rules_res_occ_get(void *priv)
 863 {
 864         struct nsim_fib_data *data = priv;
 865
 866         return nsim_fib_get_val(data, NSIM_RESOURCE_IPV6_FIB_RULES, false);
 867 }
 868
 869 static void nsim_fib_set_max_all(struct nsim_fib_data *data,
 870                                  struct devlink *devlink)
 871 {
 872         enum nsim_resource_id res_ids[] = {
 873                 NSIM_RESOURCE_IPV4_FIB, NSIM_RESOURCE_IPV4_FIB_RULES,
 874                 NSIM_RESOURCE_IPV6_FIB, NSIM_RESOURCE_IPV6_FIB_RULES
 875         };
 876         int i;
 877
 878         for (i = 0; i < ARRAY_SIZE(res_ids); i++) {
 879                 int err;
 880                 u64 val;
 881
 882                 err = devlink_resource_size_get(devlink, res_ids[i], &val);
 883                 if (err)
 884                         val = (u64) -1;
 885                 nsim_fib_set_max(data, res_ids[i], val);
 886         }
 887 }
 888
 889 struct nsim_fib_data *nsim_fib_create(struct devlink *devlink,
 890                                       struct netlink_ext_ack *extack)
 891 {
 892         struct nsim_fib_data *data;
 893         int err;
 894
 895         data = kzalloc(sizeof(*data), GFP_KERNEL);
 896         if (!data)
 897                 return ERR_PTR(-ENOMEM);
 898         data->devlink = devlink;
 899
 900         spin_lock_init(&data->fib_lock);
 901         INIT_LIST_HEAD(&data->fib_rt_list);
 902         err = rhashtable_init(&data->fib_rt_ht, &nsim_fib_rt_ht_params);
 903         if (err)
 904                 goto err_data_free;
 905
 906         nsim_fib_set_max_all(data, devlink);
 907
 908         data->fib_nb.notifier_call = nsim_fib_event_nb;
 909         err = register_fib_notifier(devlink_net(devlink), &data->fib_nb,
 910                                     nsim_fib_dump_inconsistent, extack);
 911         if (err) {
 912                 pr_err("Failed to register fib notifier\n");
 913                 goto err_rhashtable_destroy;
 914         }
 915
 916         devlink_resource_occ_get_register(devlink,
 917                                           NSIM_RESOURCE_IPV4_FIB,
 918                                           nsim_fib_ipv4_resource_occ_get,
 919                                           data);
 920         devlink_resource_occ_get_register(devlink,
 921                                           NSIM_RESOURCE_IPV4_FIB_RULES,
 922                                           nsim_fib_ipv4_rules_res_occ_get,
 923                                           data);
 924         devlink_resource_occ_get_register(devlink,
 925                                           NSIM_RESOURCE_IPV6_FIB,
 926                                           nsim_fib_ipv6_resource_occ_get,
 927                                           data);
 928         devlink_resource_occ_get_register(devlink,
 929                                           NSIM_RESOURCE_IPV6_FIB_RULES,
 930                                           nsim_fib_ipv6_rules_res_occ_get,
 931                                           data);
 932         return data;
 933
 934 err_rhashtable_destroy:
 935         rhashtable_free_and_destroy(&data->fib_rt_ht, nsim_fib_rt_free,
 936                                     data);
 937 err_data_free:
 938         kfree(data);
 939         return ERR_PTR(err);
 940 }
 941
 942 void nsim_fib_destroy(struct devlink *devlink, struct nsim_fib_data *data)
 943 {
 944         devlink_resource_occ_get_unregister(devlink,
 945                                             NSIM_RESOURCE_IPV6_FIB_RULES);
 946         devlink_resource_occ_get_unregister(devlink,
 947                                             NSIM_RESOURCE_IPV6_FIB);
 948         devlink_resource_occ_get_unregister(devlink,
 949                                             NSIM_RESOURCE_IPV4_FIB_RULES);
 950         devlink_resource_occ_get_unregister(devlink,
 951                                             NSIM_RESOURCE_IPV4_FIB);
 952         unregister_fib_notifier(devlink_net(devlink), &data->fib_nb);
 953         rhashtable_free_and_destroy(&data->fib_rt_ht, nsim_fib_rt_free,
 954                                     data);
 955         WARN_ON_ONCE(!list_empty(&data->fib_rt_list));
 956         kfree(data);
 957 }