src/plugins/vrrp/node.c

   1 /*
   2  * node.c - vrrp packet handling node definitions
   3  *
   4  * Copyright 2019-2020 Rubicon Communications, LLC (Netgate)
   5  *
   6  * SPDX-License-Identifier: Apache-2.0
   7  *
   8  */
   9 #include <vlib/vlib.h>
  10 #include <vlibmemory/api.h>
  11 #include <vnet/vnet.h>
  12 #include <vnet/ip/ip4_packet.h>
  13 #include <vnet/ip/ip6_link.h>
  14 #include <vnet/ethernet/arp_packet.h>
  15 #include <vnet/fib/fib_sas.h>
  16 #include <vppinfra/error.h>
  17 #include <vrrp/vrrp.h>
  18 #include <vrrp/vrrp_packet.h>
  19
  20 typedef struct
  21 {
  22   u32 sw_if_index;
  23   u8 is_ipv6;
  24   vrrp_header_t vrrp;
  25   u8 addrs[256];                /* print up to 64 IPv4 or 16 IPv6 addresses */
  26 } vrrp_trace_t;
  27
  28 /* packet trace format function */
  29 static u8 *
  30 format_vrrp_trace (u8 * s, va_list * args)
  31 {
  32   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  33   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  34   vrrp_trace_t *t = va_arg (*args, vrrp_trace_t *);
  35   int i;
  36
  37   s = format (s, "VRRP: sw_if_index %d IPv%d\n",
  38               t->sw_if_index, (t->is_ipv6) ? 6 : 4);
  39   s = format (s, "    %U\n", format_vrrp_packet_hdr, &t->vrrp);
  40   s = format (s, "    addresses: ");
  41
  42   for (i = 0; i < t->vrrp.n_addrs; i++)
  43     {
  44       if (t->is_ipv6)
  45         s = format (s, "%U ", format_ip6_address,
  46                     (ip6_address_t *) (t->addrs + i * 16));
  47       else
  48         s = format (s, "%U ", format_ip4_address,
  49                     (ip4_address_t *) (t->addrs + i * 4));
  50     }
  51
  52   return s;
  53 }
  54
  55 extern vlib_node_registration_t vrrp4_input_node;
  56 extern vlib_node_registration_t vrrp6_input_node;
  57 extern vlib_node_registration_t vrrp4_arp_input_node;
  58 extern vlib_node_registration_t vrrp6_nd_input_node;
  59
  60 #define foreach_vrrp_error                                        \
  61 _(RECEIVED, "VRRP packets processed")                             \
  62 _(BAD_TTL, "VRRP advertisement TTL is not 255")                   \
  63 _(NOT_VERSION_3, "VRRP version is not 3")                         \
  64 _(INCOMPLETE_PKT, "VRRP packet has wrong size")                   \
  65 _(BAD_CHECKSUM, "VRRP checksum is invalid")                       \
  66 _(UNKNOWN_VR, "VRRP message does not match known VRs")            \
  67 _(ADDR_MISMATCH, "VR addrs do not match configuration")
  68
  69 typedef enum
  70 {
  71 #define _(sym,str) VRRP_ERROR_##sym,
  72   foreach_vrrp_error
  73 #undef _
  74     VRRP_N_ERROR,
  75 } vrrp_error_t;
  76
  77 static char *vrrp_error_strings[] = {
  78 #define _(sym,string) string,
  79   foreach_vrrp_error
  80 #undef _
  81 };
  82
  83 typedef enum
  84 {
  85   VRRP_INPUT_NEXT_DROP,
  86   VRRP_INPUT_N_NEXT,
  87 } vrrp_next_t;
  88
  89 /* Given a VR and a pointer to the VRRP header of an incoming packet,
  90  * compare the local src address to the peers. Return < 0 if the local
  91  * address < the peer address, 0 if they're equal, > 0 if
  92  * the local address > the peer address
  93  */
  94 static int
  95 vrrp_vr_addr_cmp (vrrp_vr_t *vr, ip46_address_t *peer_addr)
  96 {
  97   vrrp_vr_config_t *vrc = &vr->config;
  98   void *peer_addr_bytes, *local_addr;
  99   ip46_address_t addr;
 100   int addr_size;
 101
 102   clib_memset (&addr, 0, sizeof (addr));
 103
 104   if (vrrp_vr_is_ipv6 (vr))
 105     {
 106       peer_addr_bytes = &peer_addr->ip6;
 107       local_addr = &addr.ip6;
 108       addr_size = 16;
 109       ip6_address_copy (local_addr,
 110                         ip6_get_link_local_address (vrc->sw_if_index));
 111     }
 112   else
 113     {
 114       peer_addr_bytes = &peer_addr->ip4;
 115       local_addr = &addr.ip4;
 116       addr_size = 4;
 117       fib_sas4_get (vrc->sw_if_index, NULL, local_addr);
 118     }
 119
 120   return memcmp (local_addr, peer_addr_bytes, addr_size);
 121 }
 122
 123 static void
 124 vrrp_input_process_master (vrrp_vr_t *vr, vrrp_input_process_args_t *args)
 125 {
 126   /* received priority 0, another VR is shutting down. send an adv and
 127    * remain in the master state
 128    */
 129   if (args->priority == 0)
 130     {
 131       clib_warning ("Received shutdown message from a peer on VR %U",
 132                     format_vrrp_vr_key, vr);
 133       vrrp_incr_stat_counter (VRRP_STAT_COUNTER_PRIO0_RCVD, vr->stat_index);
 134       vrrp_adv_send (vr, 0);
 135       vrrp_vr_timer_set (vr, VRRP_VR_TIMER_ADV);
 136       return;
 137     }
 138
 139   /* if either:
 140    * - received priority > adjusted priority, or
 141    * - received priority == adjusted priority and peer addr > local addr
 142    * allow the local VR to be preempted by the peer
 143    */
 144   if ((args->priority > vrrp_vr_priority (vr)) ||
 145       ((args->priority == vrrp_vr_priority (vr)) &&
 146        (vrrp_vr_addr_cmp (vr, &args->src_addr) < 0)))
 147     {
 148       vrrp_vr_transition (vr, VRRP_VR_STATE_BACKUP, args);
 149
 150       return;
 151     }
 152
 153   /* if we made it this far, eiher received prority < adjusted priority or
 154    * received == adjusted and local addr > peer addr. Ignore.
 155    */
 156   return;
 157 }
 158
 159 /* RFC 5798 section 6.4.2 */
 160 static void
 161 vrrp_input_process_backup (vrrp_vr_t *vr, vrrp_input_process_args_t *args)
 162 {
 163   vrrp_vr_config_t *vrc = &vr->config;
 164   vrrp_vr_runtime_t *vrt = &vr->runtime;
 165
 166   /* master shutting down, ready for election */
 167   if (args->priority == 0)
 168     {
 169       clib_warning ("Master for VR %U is shutting down", format_vrrp_vr_key,
 170                     vr);
 171       vrrp_incr_stat_counter (VRRP_STAT_COUNTER_PRIO0_RCVD, vr->stat_index);
 172       vrt->master_down_int = vrt->skew;
 173       vrrp_vr_timer_set (vr, VRRP_VR_TIMER_MASTER_DOWN);
 174       return;
 175     }
 176
 177   /* no preempt set or adv from a higher priority router, update timers */
 178   if (!(vrc->flags & VRRP_VR_PREEMPT) ||
 179       (args->priority >= vrrp_vr_priority (vr)))
 180     {
 181       vrt->master_adv_int = args->max_adv_int;
 182
 183       vrrp_vr_skew_compute (vr);
 184       vrrp_vr_master_down_compute (vr);
 185       vrrp_vr_timer_set (vr, VRRP_VR_TIMER_MASTER_DOWN);
 186       return;
 187     }
 188
 189   /* preempt set or our priority > received, continue to wait on master down */
 190   return;
 191 }
 192
 193 always_inline void
 194 vrrp_input_process (vrrp_input_process_args_t * args)
 195 {
 196   vrrp_vr_t *vr;
 197
 198   vr = vrrp_vr_lookup_index (args->vr_index);
 199
 200   if (!vr)
 201     {
 202       clib_warning ("Error retrieving VR with index %u", args->vr_index);
 203       return;
 204     }
 205
 206   vrrp_incr_stat_counter (VRRP_STAT_COUNTER_ADV_RCVD, vr->stat_index);
 207
 208   switch (vr->runtime.state)
 209     {
 210     case VRRP_VR_STATE_INIT:
 211       return;
 212     case VRRP_VR_STATE_BACKUP:
 213       /* this is usually the only state an advertisement should be received */
 214       vrrp_input_process_backup (vr, args);
 215       break;
 216     case VRRP_VR_STATE_MASTER:
 217       /* might be getting preempted. or have a misbehaving peer */
 218       clib_warning ("Received advertisement for master VR %U",
 219                     format_vrrp_vr_key, vr);
 220       vrrp_input_process_master (vr, args);
 221       break;
 222     default:
 223       clib_warning ("Received advertisement for VR %U in unknown state %d",
 224                     format_vrrp_vr_key, vr, vr->runtime.state);
 225       break;
 226     }
 227
 228   return;
 229 }
 230
 231 typedef struct
 232 {
 233   ip46_address_t ip;
 234   u32 vr_index;
 235   u8 vr_id;
 236   u8 is_ipv6;
 237 } vrrp_arp_nd_trace_t;
 238
 239
 240 static u8 *
 241 format_vrrp_arp_nd_input_trace (u8 * s, va_list * va)
 242 {
 243   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
 244   CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
 245   vrrp_arp_nd_trace_t *t = va_arg (*va, vrrp_arp_nd_trace_t *);
 246
 247   s = format (s, "address %U",
 248               (t->is_ipv6) ? format_ip6_address : format_ip4_address,
 249               (t->is_ipv6) ? (void *) &t->ip.ip6 : (void *) &t->ip.ip4);
 250
 251   if (t->vr_index != ~0)
 252     s = format (s, ": vr_index %u vr_id %u", t->vr_index, t->vr_id);
 253
 254   return s;
 255 }
 256
 257 typedef enum
 258 {
 259   VRRP_ARP_INPUT_NEXT_DROP,
 260   VRRP_ARP_INPUT_NEXT_REPLY_TX,
 261   VRRP_ARP_N_NEXT,
 262 } vrrp_arp_next_t;
 263
 264 typedef enum
 265 {
 266   VRRP_ND_INPUT_NEXT_DROP,
 267   VRRP_ND_INPUT_NEXT_REPLY_TX,
 268   VRRP_ND_N_NEXT,
 269 } vrrp_nd_next_t;
 270
 271 static_always_inline void
 272 vrrp_arp_nd_next (vlib_buffer_t * b, u32 * next_index, u32 * vr_index,
 273                   u8 is_ipv6)
 274 {
 275   vnet_main_t *vnm = vnet_get_main ();
 276   vlib_main_t *vm = vlib_get_main ();
 277   ethernet_header_t *eth, *eth_new;
 278   void *lookup_addr = 0;
 279   vrrp_vr_t *vr;
 280   u32 sw_if_index;
 281   vnet_link_t link_type;
 282   u8 *rewrite, rewrite_len;
 283   int bogus_length;
 284   /* ND vars */
 285   ip6_header_t *ip6 = 0;
 286   icmp6_neighbor_solicitation_or_advertisement_header_t *sol_adv = 0;
 287   icmp6_neighbor_discovery_ethernet_link_layer_address_option_t *lladdr = 0;
 288   /* ARP vars */
 289   ethernet_arp_header_t *arp;
 290   ip4_address_t ip4_addr;
 291
 292   if (is_ipv6)
 293     {
 294       ip6 = vlib_buffer_get_current (b);
 295
 296       /* we only care about about ICMP6 neighbor solicitiations */
 297       if (ip6->protocol != IP_PROTOCOL_ICMP6)
 298         return;
 299
 300       sol_adv = ip6_next_header (ip6);
 301       lladdr = (void *) (sol_adv + 1);
 302
 303       /* skip anything other than neighbor solicitations */
 304       if (sol_adv->icmp.type != ICMP6_neighbor_solicitation)
 305         return;
 306
 307       lookup_addr = &sol_adv->target_address;
 308       link_type = VNET_LINK_IP6;
 309     }
 310   else
 311     {
 312       arp = vlib_buffer_get_current (b);
 313
 314       /* skip non-request packets */
 315       if (arp->opcode != clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request))
 316         return;
 317
 318       lookup_addr = &arp->ip4_over_ethernet[1].ip4;
 319       link_type = VNET_LINK_ARP;
 320     }
 321
 322   sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
 323
 324   /* Don't bother with a hash lookup if no VRs configured on this interface */
 325   if (!vrrp_intf_num_vrs (sw_if_index, is_ipv6))
 326     return;
 327
 328   /* skip requests that are not for VRRP addresses */
 329   *vr_index = vrrp_vr_lookup_address (sw_if_index, is_ipv6, lookup_addr);
 330   if (*vr_index == ~0)
 331     return;
 332
 333   vr = vrrp_vr_lookup_index (*vr_index);
 334   if (!vr || vr->runtime.state != VRRP_VR_STATE_MASTER)
 335     {
 336       /* RFC 5798 - section 6.4.2 - Backup "MUST NOT respond" to ARP/ND.
 337        * So we must drop the request rather than allowing it to continue
 338        * on the feature arc.
 339        */
 340       *next_index = VRRP_ARP_INPUT_NEXT_DROP;
 341       return;
 342     }
 343
 344   /* RFC 5798 section 6.4.3: Master "MUST respond" to ARP/ND. */
 345   eth = ethernet_buffer_get_header (b);
 346   rewrite = ethernet_build_rewrite (vnm, sw_if_index, link_type,
 347                                     eth->src_address);
 348   rewrite_len = vec_len (rewrite);
 349   if (rewrite_len == 0)
 350     return;
 351
 352   /* send the reply out the incoming interface */
 353   *next_index = VRRP_ARP_INPUT_NEXT_REPLY_TX;
 354   vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
 355
 356   /* the outbound ethernet & vlan headers may have a different length than
 357    * the received header, so get a pointer to the new start of the packet
 358    * and write the header there.
 359    */
 360   vlib_buffer_advance (b, -rewrite_len);
 361   eth_new = vlib_buffer_get_current (b);
 362   clib_memcpy_fast (eth_new, rewrite, rewrite_len);
 363   vec_free (rewrite);
 364
 365   if (is_ipv6)
 366     {
 367       if (ip6_address_is_unspecified (&ip6->src_address))
 368         ip6_set_reserved_multicast_address (&ip6->dst_address,
 369                                             IP6_MULTICAST_SCOPE_link_local,
 370                                             IP6_MULTICAST_GROUP_ID_all_hosts);
 371       else
 372         ip6->dst_address = ip6->src_address;
 373
 374       ip6->src_address = sol_adv->target_address;
 375       ip6->hop_limit = 255;
 376       sol_adv->icmp.type = ICMP6_neighbor_advertisement;
 377       sol_adv->icmp.checksum = 0;
 378       sol_adv->advertisement_flags =
 379         clib_host_to_net_u32 (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_ROUTER
 380                               | ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_SOLICITED
 381                               | ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE);
 382
 383       clib_memcpy (lladdr->ethernet_address, vr->runtime.mac.bytes,
 384                    sizeof (mac_address_t));
 385       lladdr->header.type =
 386         ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address;
 387
 388       sol_adv->icmp.checksum =
 389         ip6_tcp_udp_icmp_compute_checksum (vm, b, ip6, &bogus_length);
 390
 391     }
 392   else
 393     {
 394       ip4_addr = arp->ip4_over_ethernet[1].ip4;
 395
 396       arp->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
 397       arp->ip4_over_ethernet[1] = arp->ip4_over_ethernet[0];
 398
 399       arp->ip4_over_ethernet[0].mac = vr->runtime.mac;
 400       arp->ip4_over_ethernet[0].ip4 = ip4_addr;
 401     }
 402 }
 403
 404 static_always_inline uword
 405 vrrp_arp_nd_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 406                           vlib_frame_t * frame, u8 is_ipv6)
 407 {
 408   u32 n_left_from, *from, next_index, *to_next;
 409
 410   from = vlib_frame_vector_args (frame);
 411   n_left_from = frame->n_vectors;
 412   next_index = node->cached_next_index;
 413
 414   while (n_left_from > 0)
 415     {
 416       u32 n_left_to_next;
 417
 418       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 419
 420       while (n_left_from > 0 && n_left_to_next > 0)
 421         {
 422
 423           vlib_buffer_t *b0;
 424           u32 bi0;
 425           u32 next0;
 426           u32 vr_index = ~0;
 427
 428           bi0 = from[0];
 429           to_next[0] = bi0;
 430           from += 1;
 431           to_next += 1;
 432           n_left_from -= 1;
 433           n_left_to_next -= 1;
 434
 435           b0 = vlib_get_buffer (vm, bi0);
 436
 437           vnet_feature_next (&next0, b0);
 438           vrrp_arp_nd_next (b0, &next0, &vr_index, is_ipv6);
 439
 440           if (b0->flags & VLIB_BUFFER_IS_TRACED)
 441             {
 442               vrrp_arp_nd_trace_t *t =
 443                 vlib_add_trace (vm, node, b0, sizeof (*t));
 444               vrrp_vr_t *vr;
 445
 446               if (is_ipv6)
 447                 {
 448                   ip6_header_t *ip0;
 449                   icmp6_neighbor_solicitation_or_advertisement_header_t
 450                     * sol_adv0;
 451
 452                   ip0 = vlib_buffer_get_current (b0);
 453                   sol_adv0 = ip6_next_header (ip0);
 454                   t->ip.ip6 = sol_adv0->target_address;
 455                 }
 456               else
 457                 {
 458                   ethernet_arp_header_t *arp0;
 459
 460                   arp0 = vlib_buffer_get_current (b0);
 461                   t->ip.ip4 = arp0->ip4_over_ethernet[0].ip4;
 462                 }
 463
 464               vr = vrrp_vr_lookup_index (vr_index);
 465               if (vr)
 466                 t->vr_id = vr->config.vr_id;
 467
 468               t->vr_index = vr_index;
 469               t->is_ipv6 = is_ipv6;
 470             }
 471
 472           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 473                                            n_left_to_next, bi0, next0);
 474         }
 475
 476       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 477     }
 478
 479   return frame->n_vectors;
 480 }
 481
 482 VLIB_NODE_FN (vrrp4_arp_input_node) (vlib_main_t * vm,
 483                                      vlib_node_runtime_t * node,
 484                                      vlib_frame_t * frame)
 485 {
 486   return vrrp_arp_nd_input_inline (vm, node, frame, 0 /* is_ipv6 */ );
 487 }
 488
 489 VLIB_REGISTER_NODE (vrrp4_arp_input_node) =
 490 {
 491   .name = "vrrp4-arp-input",
 492   .vector_size = sizeof (u32),
 493   .format_trace = format_vrrp_arp_nd_input_trace,
 494   .type = VLIB_NODE_TYPE_INTERNAL,
 495
 496   .n_errors = ARRAY_LEN(vrrp_error_strings),
 497   .error_strings = vrrp_error_strings,
 498
 499   .n_next_nodes = VRRP_ARP_N_NEXT,
 500
 501   .next_nodes = {
 502         [VRRP_ARP_INPUT_NEXT_DROP] = "error-drop",
 503         [VRRP_ARP_INPUT_NEXT_REPLY_TX] = "interface-output",
 504   },
 505 };
 506
 507 VNET_FEATURE_INIT (vrrp4_arp_feat_node, static) =
 508 {
 509   .arc_name = "arp",
 510   .node_name = "vrrp4-arp-input",
 511   .runs_before = VNET_FEATURES ("arp-reply"),
 512 };
 513
 514 VLIB_NODE_FN (vrrp6_nd_input_node) (vlib_main_t * vm,
 515                                      vlib_node_runtime_t * node,
 516                                      vlib_frame_t * frame)
 517 {
 518   return vrrp_arp_nd_input_inline (vm, node, frame, 1 /* is_ipv6 */);
 519 }
 520
 521 VLIB_REGISTER_NODE (vrrp6_nd_input_node) =
 522 {
 523   .name = "vrrp6-nd-input",
 524   .vector_size = sizeof (u32),
 525   .format_trace = format_vrrp_arp_nd_input_trace,
 526   .type = VLIB_NODE_TYPE_INTERNAL,
 527
 528   .n_errors = ARRAY_LEN(vrrp_error_strings),
 529   .error_strings = vrrp_error_strings,
 530
 531   .n_next_nodes = VRRP_ND_N_NEXT,
 532
 533   .next_nodes = {
 534         [VRRP_ND_INPUT_NEXT_DROP] = "error-drop",
 535         [VRRP_ND_INPUT_NEXT_REPLY_TX] = "interface-output",
 536   },
 537 };
 538
 539 VNET_FEATURE_INIT (vrrp6_nd_feat_node, static) =
 540 {
 541   .arc_name = "ip6-local",
 542   .node_name = "vrrp6-nd-input",
 543   .runs_before = VNET_FEATURES ("ip6-local-end-of-arc"),
 544 };
 545
 546 static_always_inline uword
 547 vrrp_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 548                     vlib_frame_t * frame, u8 is_ipv6)
 549 {
 550   u32 n_left_from, *from;
 551   vrrp_main_t *vmp = &vrrp_main;
 552
 553   from = vlib_frame_vector_args (frame);
 554   n_left_from = frame->n_vectors;
 555
 556   while (n_left_from > 0)
 557     {
 558       u32 bi0;
 559       vlib_buffer_t *b0;
 560       u32 next0, error0;
 561       void *ip0;
 562       vrrp_header_t *vrrp0;
 563       vrrp_vr_t *vr0;
 564       vrrp_input_process_args_t args0;
 565       u8 *ttl0;
 566       u16 rx_csum0;
 567       u16 payload_len0;
 568       int addr_len;
 569
 570       bi0 = from[0];
 571       b0 = vlib_get_buffer (vm, bi0);
 572
 573       ip0 = vlib_buffer_get_current (b0);
 574
 575       if (is_ipv6)
 576         {
 577           ip6_header_t *ip6 = ip0;
 578
 579           vrrp0 = (vrrp_header_t *) (ip6 + 1);
 580           ttl0 = &ip6->hop_limit;
 581           addr_len = 16;
 582           payload_len0 = clib_net_to_host_u16 (ip6->payload_length);
 583           vlib_buffer_advance (b0, sizeof (*ip6));
 584           clib_memcpy_fast (&args0.src_addr.ip6, &ip6->src_address, addr_len);
 585         }
 586       else
 587         {
 588           ip4_header_t *ip4 = ip0;
 589
 590           vrrp0 = (vrrp_header_t *) (ip4 + 1);
 591           ttl0 = &ip4->ttl;
 592           addr_len = 4;
 593           payload_len0 = clib_net_to_host_u16 (ip4->length) - sizeof(*ip4);
 594           vlib_buffer_advance (b0, sizeof (*ip4));
 595           clib_memcpy_fast (&args0.src_addr.ip4, &ip4->src_address, addr_len);
 596         }
 597
 598       next0 = VRRP_INPUT_NEXT_DROP;
 599
 600       error0 = VRRP_ERROR_RECEIVED;
 601
 602       /* Validation from RFC 5798 sec 7.1 */
 603
 604       /* checksum set to 0 for calculation, save original value */
 605       rx_csum0 = vrrp0->checksum;
 606       vrrp0->checksum = 0;
 607
 608       /* Mandatory - TTL/hop limit must be 255 */
 609       if (*ttl0 != 255)
 610         {
 611           error0 = VRRP_ERROR_BAD_TTL;
 612           vrrp_incr_err_counter (VRRP_ERR_COUNTER_TTL);
 613           goto trace;
 614         }
 615
 616       /* Mandatory - VRRP version must be 3 */
 617       if ((vrrp0->vrrp_version_and_type >> 4) != 3)
 618         {
 619           error0 = VRRP_ERROR_NOT_VERSION_3;
 620           vrrp_incr_err_counter (VRRP_ERR_COUNTER_VERSION);
 621           goto trace;
 622         }
 623
 624       /* Mandatory - packet must be complete */
 625       if (b0->current_length < sizeof (*vrrp0) +
 626           ((u32) vrrp0->n_addrs) * addr_len)
 627         {
 628           error0 = VRRP_ERROR_INCOMPLETE_PKT;
 629           vrrp_incr_err_counter (VRRP_ERR_COUNTER_PKT_LEN);
 630           goto trace;
 631         }
 632
 633       /* Mandatory - checksum must be correct */
 634       if (rx_csum0 != vrrp_adv_csum (ip0, vrrp0, is_ipv6, payload_len0))
 635         {
 636           error0 = VRRP_ERROR_BAD_CHECKSUM;
 637           vrrp_incr_err_counter (VRRP_ERR_COUNTER_CHKSUM);
 638           goto trace;
 639         }
 640
 641       /* Mandatory - VR must be configured on the interface adv received on */
 642       if (!(vr0 =
 643               vrrp_vr_lookup (vnet_buffer(b0)->sw_if_index[VLIB_RX],
 644                               vrrp0->vr_id, is_ipv6)))
 645         {
 646           error0 = VRRP_ERROR_UNKNOWN_VR;
 647           vrrp_incr_err_counter (VRRP_ERR_COUNTER_VRID);
 648           goto trace;
 649         }
 650
 651       /* Optional - count of addresses should match configuration */
 652       /* Could also check that addresses match, but likely to be O(n^2) */
 653       if (vrrp0->n_addrs != vec_len (vr0->config.vr_addrs))
 654         {
 655           error0 = VRRP_ERROR_ADDR_MISMATCH;
 656           vrrp_incr_err_counter (VRRP_ERR_COUNTER_ADDR_LIST);
 657           goto trace;
 658         }
 659
 660       /* signal main thread to process contents of packet */
 661       args0.vr_index = vr0 - vmp->vrs;
 662       args0.priority = vrrp0->priority;
 663       args0.max_adv_int = vrrp_adv_int_from_packet (vrrp0);
 664
 665       vl_api_rpc_call_main_thread (vrrp_input_process, (u8 *) &args0,
 666                                    sizeof (args0));
 667
 668     trace:
 669       vrrp0->checksum = rx_csum0; /* restore csum for correct trace output */
 670       b0->error = node->errors[error0];
 671
 672       if (b0->flags & VLIB_BUFFER_IS_TRACED)
 673         {
 674           vrrp_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
 675           size_t addr_len = (is_ipv6 ? 16 : 4);
 676
 677           t->sw_if_index = vnet_buffer(b0)->sw_if_index[VLIB_RX];
 678           t->is_ipv6 = is_ipv6;
 679           clib_memcpy_fast (&t->vrrp, vrrp0, sizeof (*vrrp0));
 680           clib_memcpy_fast (t->addrs, (void *) (vrrp0 + 1),
 681                             (size_t) vrrp0->n_addrs * addr_len);
 682         }
 683
 684       /* always drop, never forward or reply here */
 685       vlib_set_next_frame_buffer (vm, node, next0, bi0);
 686
 687       from += 1;
 688       n_left_from -= 1;
 689     }
 690
 691   return frame->n_vectors;
 692 }
 693
 694 VLIB_NODE_FN (vrrp4_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
 695                                 vlib_frame_t * frame)
 696 {
 697   return vrrp_input_inline (vm, node, frame, 0);
 698 }
 699
 700 VLIB_REGISTER_NODE (vrrp4_input_node) =
 701 {
 702   .name = "vrrp4-input",
 703   .vector_size = sizeof (u32),
 704   .format_trace = format_vrrp_trace,
 705   .type = VLIB_NODE_TYPE_INTERNAL,
 706
 707   .n_errors = ARRAY_LEN(vrrp_error_strings),
 708   .error_strings = vrrp_error_strings,
 709
 710   .n_next_nodes = VRRP_INPUT_N_NEXT,
 711
 712   .next_nodes = {
 713         [VRRP_INPUT_NEXT_DROP] = "error-drop",
 714   },
 715 };
 716
 717 VLIB_NODE_FN (vrrp6_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
 718                                 vlib_frame_t * frame)
 719 {
 720   return vrrp_input_inline (vm, node, frame, 1);
 721 }
 722
 723 VLIB_REGISTER_NODE (vrrp6_input_node) =
 724 {
 725   .name = "vrrp6-input",
 726   .vector_size = sizeof (u32),
 727   .format_trace = format_vrrp_trace,
 728   .type = VLIB_NODE_TYPE_INTERNAL,
 729
 730   .n_errors = ARRAY_LEN(vrrp_error_strings),
 731   .error_strings = vrrp_error_strings,
 732
 733   .n_next_nodes = VRRP_INPUT_N_NEXT,
 734
 735   .next_nodes = {
 736         [VRRP_INPUT_NEXT_DROP] = "error-drop",
 737   },
 738 };
 739
 740 typedef struct
 741 {
 742   u32 sw_if_index;
 743   u8 is_ipv6;
 744   ip46_address_t src, dst;
 745 } vrrp_accept_owner_trace_t;
 746
 747 /* packet trace format function */
 748 static u8 *
 749 format_vrrp_accept_owner_trace (u8 * s, va_list * args)
 750 {
 751   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 752   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 753   vrrp_accept_owner_trace_t *t = va_arg (*args, vrrp_accept_owner_trace_t *);
 754   int ip_ver = 4, ip_type = IP46_TYPE_IP4;
 755
 756   if (t->is_ipv6)
 757     {
 758       ip_ver = 6;
 759       ip_type = IP46_TYPE_IP6;
 760     }
 761
 762   s = format (s, "IPv%d sw_if_index %d %U -> %U",
 763               ip_ver, t->sw_if_index,
 764               format_ip46_address, &t->src, ip_type,
 765               format_ip46_address, &t->dst, ip_type);
 766
 767   return s;
 768 }
 769
 770 #define foreach_vrrp_accept_owner_error                           \
 771 _(RECEIVED, "VRRP owner accept packets received")                 \
 772 _(PROCESSED, "VRRP owner accept advertisements processed")
 773
 774 typedef enum
 775 {
 776 #define _(sym,str) VRRP_ACCEPT_OWNER_ERROR_##sym,
 777   foreach_vrrp_accept_owner_error
 778 #undef _
 779     VRRP_ACCEPT_OWNER_N_ERROR,
 780 } vrrp_accept_owner_error_t;
 781
 782 static char *vrrp_accept_owner_error_strings[] = {
 783 #define _(sym,string) string,
 784   foreach_vrrp_accept_owner_error
 785 #undef _
 786 };
 787
 788 typedef enum
 789 {
 790   VRRP_ACCEPT_OWNER_NEXT_PROCESS,
 791   VRRP_ACCEPT_OWNER_N_NEXT,
 792 } vrrp_accept_owner_next_t;
 793
 794 static_always_inline void
 795 vrrp_accept_owner_next_node (u32 sw_if_index, u8 vr_id, u8 is_ipv6,
 796                              u32 *next_index, u32 *error)
 797 {
 798   vrrp_vr_t *vr = vrrp_vr_lookup (sw_if_index, vr_id, is_ipv6);
 799
 800   if (vr && (vr->runtime.state == VRRP_VR_STATE_MASTER) &&
 801       (vr->config.flags & VRRP_VR_ACCEPT))
 802     {
 803       *next_index = VRRP_ACCEPT_OWNER_NEXT_PROCESS;
 804       *error = VRRP_ACCEPT_OWNER_ERROR_PROCESSED;
 805     }
 806 }
 807
 808 static_always_inline uword
 809 vrrp_accept_owner_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 810                                 vlib_frame_t * frame, u8 is_ipv6)
 811 {
 812   u32 n_left_from, *from, *to_next;
 813   u32 next_index = node->cached_next_index;
 814
 815   from = vlib_frame_vector_args (frame);
 816   n_left_from = frame->n_vectors;
 817
 818   while (n_left_from > 0)
 819     {
 820       u32 n_left_to_next;
 821
 822       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 823
 824       while (n_left_from >= 2 && n_left_to_next >= 2)
 825         {
 826           u32 bi0, bi1;
 827           vlib_buffer_t *b0, *b1;
 828           u32 next0, next1;
 829           u32 error0, error1;
 830           vrrp_header_t *vrrp0, *vrrp1;
 831           ip4_header_t *ip40, *ip41;
 832           ip6_header_t *ip60, *ip61;
 833           u32 sw_if_index0, sw_if_index1;
 834
 835           bi0 = from[0];
 836           bi1 = from[1];
 837
 838           to_next[0] = bi0;
 839           to_next[1] = bi1;
 840
 841           b0 = vlib_get_buffer (vm, bi0);
 842           b1 = vlib_get_buffer (vm, bi1);
 843
 844           /* most packets will follow feature arc */
 845           vnet_feature_next (&next0, b0);
 846           vnet_feature_next (&next1, b1);
 847
 848           error0 = error1 = VRRP_ACCEPT_OWNER_ERROR_RECEIVED;
 849
 850           sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
 851           sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_RX];
 852
 853           /* find VRRP advertisements which should be sent to VRRP node */
 854           if (is_ipv6)
 855             {
 856               ip60 = vlib_buffer_get_current (b0);
 857               ip61 = vlib_buffer_get_current (b1);
 858
 859               if (PREDICT_FALSE (ip60->protocol == IP_PROTOCOL_VRRP))
 860                 {
 861                   vrrp0 = (vrrp_header_t *) (ip60 + 1);
 862                   vrrp_accept_owner_next_node (sw_if_index0, vrrp0->vr_id,
 863                                                is_ipv6, &next0, &error0);
 864                 }
 865               if (PREDICT_FALSE (ip61->protocol == IP_PROTOCOL_VRRP))
 866                 {
 867                   vrrp1 = (vrrp_header_t *) (ip61 + 1);
 868                   vrrp_accept_owner_next_node (sw_if_index1, vrrp1->vr_id,
 869                                                is_ipv6, &next1, &error1);
 870                 }
 871             }
 872           else
 873             {
 874               ip40 = vlib_buffer_get_current (b0);
 875               ip41 = vlib_buffer_get_current (b1);
 876
 877               if (PREDICT_FALSE (ip40->protocol == IP_PROTOCOL_VRRP))
 878                 {
 879                   vrrp0 = (vrrp_header_t *) (ip40 + 1);
 880                   vrrp_accept_owner_next_node (sw_if_index0, vrrp0->vr_id,
 881                                                is_ipv6, &next0, &error0);
 882                 }
 883               if (PREDICT_FALSE (ip41->protocol == IP_PROTOCOL_VRRP))
 884                 {
 885                   vrrp1 = (vrrp_header_t *) (ip41 + 1);
 886                   vrrp_accept_owner_next_node (sw_if_index1, vrrp1->vr_id,
 887                                                is_ipv6, &next1, &error1);
 888                 }
 889             }
 890
 891           b0->error = node->errors[error0];
 892           b1->error = node->errors[error1];
 893
 894           if (b0->flags & VLIB_BUFFER_IS_TRACED)
 895             {
 896               vrrp_accept_owner_trace_t *t =
 897                 vlib_add_trace (vm, node, b0, sizeof (*t));
 898
 899               t->sw_if_index = sw_if_index0;
 900               t->is_ipv6 = is_ipv6;
 901               if (is_ipv6)
 902                 {
 903                   ip6_address_copy (&t->src.ip6, &ip60->src_address);
 904                   ip6_address_copy (&t->dst.ip6, &ip60->dst_address);
 905                 }
 906               else
 907                 {
 908                   t->src.ip4.as_u32 = ip40->src_address.as_u32;
 909                   t->dst.ip4.as_u32 = ip40->dst_address.as_u32;
 910                 }
 911             }
 912
 913           if (b1->flags & VLIB_BUFFER_IS_TRACED)
 914             {
 915               vrrp_accept_owner_trace_t *t =
 916                 vlib_add_trace (vm, node, b1, sizeof (*t));
 917
 918               t->sw_if_index = sw_if_index1;
 919               t->is_ipv6 = is_ipv6;
 920               if (is_ipv6)
 921                 {
 922                   ip6_address_copy (&t->src.ip6, &ip61->src_address);
 923                   ip6_address_copy (&t->dst.ip6, &ip61->dst_address);
 924                 }
 925               else
 926                 {
 927                   t->src.ip4.as_u32 = ip41->src_address.as_u32;
 928                   t->dst.ip4.as_u32 = ip41->dst_address.as_u32;
 929                 }
 930             }
 931
 932           from += 2;
 933           n_left_from -= 2;
 934           to_next += 2;
 935           n_left_to_next -= 2;
 936
 937           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
 938                                            to_next, n_left_to_next,
 939                                            bi0, bi1, next0, next1);
 940         }
 941
 942       while (n_left_from > 0 && n_left_to_next > 0)
 943         {
 944           u32 bi0;
 945           vlib_buffer_t *b0;
 946           u32 next0;
 947           u32 error0;
 948           vrrp_header_t *vrrp0;
 949           ip4_header_t *ip4;
 950           ip6_header_t *ip6;
 951           u32 sw_if_index0;
 952
 953           bi0 = from[0];
 954           to_next[0] = bi0;
 955
 956           b0 = vlib_get_buffer (vm, bi0);
 957
 958           /* most packets will follow feature arc */
 959           vnet_feature_next (&next0, b0);
 960
 961           error0 = VRRP_ACCEPT_OWNER_ERROR_RECEIVED;
 962
 963           sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
 964
 965           /* find VRRP advertisements which should be sent to VRRP node */
 966           if (is_ipv6)
 967             {
 968               ip6 = vlib_buffer_get_current (b0);
 969
 970               if (PREDICT_FALSE (ip6->protocol == IP_PROTOCOL_VRRP))
 971                 {
 972                   vrrp0 = (vrrp_header_t *) (ip6 + 1);
 973                   vrrp_accept_owner_next_node (sw_if_index0, vrrp0->vr_id,
 974                                                is_ipv6, &next0, &error0);
 975                 }
 976             }
 977           else
 978             {
 979               ip4 = vlib_buffer_get_current (b0);
 980
 981               if (PREDICT_FALSE (ip4->protocol == IP_PROTOCOL_VRRP))
 982                 {
 983                   vrrp0 = (vrrp_header_t *) (ip4 + 1);
 984                   vrrp_accept_owner_next_node (sw_if_index0, vrrp0->vr_id,
 985                                                is_ipv6, &next0, &error0);
 986                 }
 987             }
 988
 989           b0->error = node->errors[error0];
 990
 991           if (b0->flags & VLIB_BUFFER_IS_TRACED)
 992             {
 993               vrrp_accept_owner_trace_t *t =
 994                 vlib_add_trace (vm, node, b0, sizeof (*t));
 995
 996               t->sw_if_index = sw_if_index0;
 997               t->is_ipv6 = is_ipv6;
 998               if (is_ipv6)
 999                 {
1000                   ip6_address_copy (&t->src.ip6, &ip6->src_address);
1001                   ip6_address_copy (&t->dst.ip6, &ip6->dst_address);
1002                 }
1003               else
1004                 {
1005                   t->src.ip4.as_u32 = ip4->src_address.as_u32;
1006                   t->dst.ip4.as_u32 = ip4->dst_address.as_u32;
1007                 }
1008             }
1009
1010           from += 1;
1011           n_left_from -= 1;
1012           to_next += 1;
1013           n_left_to_next -= 1;
1014
1015           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1016                                            to_next, n_left_to_next,
1017                                            bi0, next0);
1018         }
1019
1020       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1021     }
1022
1023   return frame->n_vectors;
1024 }
1025
1026 VLIB_NODE_FN (vrrp4_accept_owner_input_node) (vlib_main_t * vm,
1027                                               vlib_node_runtime_t * node,
1028                                               vlib_frame_t * frame)
1029 {
1030   return vrrp_accept_owner_input_inline (vm, node, frame, 0);
1031 }
1032
1033 VLIB_REGISTER_NODE (vrrp4_accept_owner_input_node) =
1034 {
1035   .name = "vrrp4-accept-owner-input",
1036   .vector_size = sizeof (u32),
1037   .format_trace = format_vrrp_accept_owner_trace,
1038   .type = VLIB_NODE_TYPE_INTERNAL,
1039
1040   .n_errors = ARRAY_LEN(vrrp_accept_owner_error_strings),
1041   .error_strings = vrrp_accept_owner_error_strings,
1042
1043   .n_next_nodes = VRRP_ACCEPT_OWNER_N_NEXT,
1044
1045   .next_nodes = {
1046         [VRRP_ACCEPT_OWNER_NEXT_PROCESS] = "vrrp4-input",
1047   },
1048 };
1049
1050 VNET_FEATURE_INIT (vrrp4_accept_owner_mc, static) =
1051 {
1052   .arc_name = "ip4-multicast",
1053   .node_name = "vrrp4-accept-owner-input",
1054   .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
1055 };
1056
1057 VLIB_NODE_FN (vrrp6_accept_owner_input_node) (vlib_main_t * vm,
1058                                            vlib_node_runtime_t * node,
1059                                            vlib_frame_t * frame)
1060 {
1061   return vrrp_accept_owner_input_inline (vm, node, frame, 1);
1062 }
1063
1064 VLIB_REGISTER_NODE (vrrp6_accept_owner_input_node) =
1065 {
1066   .name = "vrrp6-accept-owner-input",
1067   .vector_size = sizeof (u32),
1068   .format_trace = format_vrrp_accept_owner_trace,
1069   .type = VLIB_NODE_TYPE_INTERNAL,
1070
1071   .n_errors = ARRAY_LEN(vrrp_accept_owner_error_strings),
1072   .error_strings = vrrp_accept_owner_error_strings,
1073
1074   .n_next_nodes = VRRP_ACCEPT_OWNER_N_NEXT,
1075
1076   .next_nodes = {
1077         [VRRP_ACCEPT_OWNER_NEXT_PROCESS] = "vrrp6-input",
1078   },
1079 };
1080
1081 VNET_FEATURE_INIT (vrrp6_accept_owner_mc, static) =
1082 {
1083   .arc_name = "ip6-multicast",
1084   .node_name = "vrrp6-accept-owner-input",
1085   .runs_before = VNET_FEATURES ("ip6-mfib-forward-lookup"),
1086 };
1087
1088 static clib_error_t *
1089 vrrp_input_init (vlib_main_t *vm)
1090 {
1091   clib_error_t *error;
1092
1093   if ((error = vlib_call_init_function (vm, vrrp_init)))
1094     return error;
1095
1096   ip4_register_protocol (IP_PROTOCOL_VRRP, vrrp4_input_node.index);
1097   ip6_register_protocol (IP_PROTOCOL_VRRP, vrrp6_input_node.index);
1098
1099   return 0;
1100 }
1101
1102 VLIB_INIT_FUNCTION (vrrp_input_init);
1103
1104
1105 /*
1106  * fd.io coding-style-patch-verification: ON
1107  *
1108  * Local Variables:
1109  * eval: (c-set-style "gnu")
1110  * End:
1111  */