src/vnet/ip/reass/ip6_sv_reass.c

   1 /*
   2  * Copyright (c) 2017 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 /**
  17  * @file
  18  * @brief IPv6 Shallow Virtual Reassembly.
  19  *
  20  * This file contains the source code for IPv6 Shallow Virtual reassembly.
  21  */
  22
  23 #include <vppinfra/vec.h>
  24 #include <vnet/vnet.h>
  25 #include <vnet/ip/ip.h>
  26 #include <vnet/ip/ip6_to_ip4.h>
  27 #include <vppinfra/bihash_48_8.h>
  28 #include <vnet/ip/reass/ip6_sv_reass.h>
  29
  30 #define MSEC_PER_SEC 1000
  31 #define IP6_SV_REASS_TIMEOUT_DEFAULT_MS 100
  32 #define IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000      // 10 seconds default
  33 #define IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT 1024
  34 #define IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
  35 #define IP6_SV_REASS_HT_LOAD_FACTOR (0.75)
  36
  37 typedef enum
  38 {
  39   IP6_SV_REASS_RC_OK,
  40   IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS,
  41   IP6_SV_REASS_RC_INTERNAL_ERROR,
  42   IP6_SV_REASS_RC_UNSUPP_IP_PROTO,
  43 } ip6_sv_reass_rc_t;
  44
  45 typedef struct
  46 {
  47   union
  48   {
  49     struct
  50     {
  51       ip6_address_t src;
  52       ip6_address_t dst;
  53       u32 xx_id;
  54       u32 frag_id;
  55       u8 unused[7];
  56       u8 proto;
  57     };
  58     u64 as_u64[6];
  59   };
  60 } ip6_sv_reass_key_t;
  61
  62 typedef union
  63 {
  64   struct
  65   {
  66     u32 reass_index;
  67     u32 thread_index;
  68   };
  69   u64 as_u64;
  70 } ip6_sv_reass_val_t;
  71
  72 typedef union
  73 {
  74   struct
  75   {
  76     ip6_sv_reass_key_t k;
  77     ip6_sv_reass_val_t v;
  78   };
  79   clib_bihash_kv_48_8_t kv;
  80 } ip6_sv_reass_kv_t;
  81
  82 typedef struct
  83 {
  84   // hash table key
  85   ip6_sv_reass_key_t key;
  86   // time when last packet was received
  87   f64 last_heard;
  88   // internal id of this reassembly
  89   u64 id;
  90   // trace operation counter
  91   u32 trace_op_counter;
  92   // buffer indexes of buffers in this reassembly in chronological order -
  93   // including overlaps and duplicate fragments
  94   u32 *cached_buffers;
  95   // set to true when this reassembly is completed
  96   bool is_complete;
  97   // ip protocol
  98   u8 ip_proto;
  99   u8 icmp_type_or_tcp_flags;
 100   u32 tcp_ack_number;
 101   u32 tcp_seq_number;
 102   // l4 src port
 103   u16 l4_src_port;
 104   // l4 dst port
 105   u16 l4_dst_port;
 106   // lru indexes
 107   u32 lru_prev;
 108   u32 lru_next;
 109 } ip6_sv_reass_t;
 110
 111 typedef struct
 112 {
 113   ip6_sv_reass_t *pool;
 114   u32 reass_n;
 115   u32 id_counter;
 116   clib_spinlock_t lock;
 117   // lru indexes
 118   u32 lru_first;
 119   u32 lru_last;
 120 } ip6_sv_reass_per_thread_t;
 121
 122 typedef struct
 123 {
 124   // IPv6 config
 125   u32 timeout_ms;
 126   f64 timeout;
 127   u32 expire_walk_interval_ms;
 128   // maximum number of fragments in one reassembly
 129   u32 max_reass_len;
 130   // maximum number of reassemblies
 131   u32 max_reass_n;
 132
 133   // IPv6 runtime
 134   clib_bihash_48_8_t hash;
 135
 136   // per-thread data
 137   ip6_sv_reass_per_thread_t *per_thread_data;
 138
 139   // convenience
 140   vlib_main_t *vlib_main;
 141   vnet_main_t *vnet_main;
 142
 143   // node index of ip6-drop node
 144   u32 ip6_drop_idx;
 145   u32 ip6_icmp_error_idx;
 146   u32 ip6_sv_reass_expire_node_idx;
 147
 148   /** Worker handoff */
 149   u32 fq_index;
 150   u32 fq_feature_index;
 151
 152   // reference count for enabling/disabling feature - per interface
 153   u32 *feature_use_refcount_per_intf;
 154 } ip6_sv_reass_main_t;
 155
 156 extern ip6_sv_reass_main_t ip6_sv_reass_main;
 157
 158 #ifndef CLIB_MARCH_VARIANT
 159 ip6_sv_reass_main_t ip6_sv_reass_main;
 160 #endif /* CLIB_MARCH_VARIANT */
 161
 162 typedef enum
 163 {
 164   IP6_SV_REASSEMBLY_NEXT_INPUT,
 165   IP6_SV_REASSEMBLY_NEXT_DROP,
 166   IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR,
 167   IP6_SV_REASSEMBLY_NEXT_HANDOFF,
 168   IP6_SV_REASSEMBLY_N_NEXT,
 169 } ip6_sv_reass_next_t;
 170
 171 typedef enum
 172 {
 173   REASS_FRAGMENT_CACHE,
 174   REASS_FINISH,
 175   REASS_FRAGMENT_FORWARD,
 176   REASS_PASSTHROUGH,
 177 } ip6_sv_reass_trace_operation_e;
 178
 179 typedef struct
 180 {
 181   ip6_sv_reass_trace_operation_e action;
 182   u32 reass_id;
 183   u32 op_id;
 184   u8 ip_proto;
 185   u16 l4_src_port;
 186   u16 l4_dst_port;
 187 } ip6_sv_reass_trace_t;
 188
 189 static u8 *
 190 format_ip6_sv_reass_trace (u8 * s, va_list * args)
 191 {
 192   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 193   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 194   ip6_sv_reass_trace_t *t = va_arg (*args, ip6_sv_reass_trace_t *);
 195   if (REASS_PASSTHROUGH != t->action)
 196     {
 197       s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
 198     }
 199   switch (t->action)
 200     {
 201     case REASS_FRAGMENT_CACHE:
 202       s = format (s, "[cached]");
 203       break;
 204     case REASS_FINISH:
 205       s =
 206         format (s, "[finish, ip proto=%u, src_port=%u, dst_port=%u]",
 207                 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
 208                 clib_net_to_host_u16 (t->l4_dst_port));
 209       break;
 210     case REASS_FRAGMENT_FORWARD:
 211       s =
 212         format (s, "[forward, ip proto=%u, src_port=%u, dst_port=%u]",
 213                 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
 214                 clib_net_to_host_u16 (t->l4_dst_port));
 215       break;
 216     case REASS_PASSTHROUGH:
 217       s = format (s, "[not-fragmented]");
 218       break;
 219     }
 220   return s;
 221 }
 222
 223 static void
 224 ip6_sv_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 225                         ip6_sv_reass_main_t * rm,
 226                         ip6_sv_reass_t * reass, u32 bi,
 227                         ip6_sv_reass_trace_operation_e action,
 228                         u32 ip_proto, u16 l4_src_port, u16 l4_dst_port)
 229 {
 230   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 231   if (pool_is_free_index
 232       (vm->trace_main.trace_buffer_pool, vlib_buffer_get_trace_index (b)))
 233     {
 234       // this buffer's trace is gone
 235       b->flags &= ~VLIB_BUFFER_IS_TRACED;
 236       return;
 237     }
 238   ip6_sv_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 239   if (reass)
 240     {
 241       t->reass_id = reass->id;
 242       t->op_id = reass->trace_op_counter;
 243       ++reass->trace_op_counter;
 244     }
 245   t->action = action;
 246   t->ip_proto = ip_proto;
 247   t->l4_src_port = l4_src_port;
 248   t->l4_dst_port = l4_dst_port;
 249 #if 0
 250   static u8 *s = NULL;
 251   s = format (s, "%U", format_ip6_sv_reass_trace, NULL, NULL, t);
 252   printf ("%.*s\n", vec_len (s), s);
 253   fflush (stdout);
 254   vec_reset_length (s);
 255 #endif
 256 }
 257
 258 always_inline void
 259 ip6_sv_reass_free (vlib_main_t * vm, ip6_sv_reass_main_t * rm,
 260                    ip6_sv_reass_per_thread_t * rt, ip6_sv_reass_t * reass)
 261 {
 262   clib_bihash_kv_48_8_t kv;
 263   kv.key[0] = reass->key.as_u64[0];
 264   kv.key[1] = reass->key.as_u64[1];
 265   kv.key[2] = reass->key.as_u64[2];
 266   kv.key[3] = reass->key.as_u64[3];
 267   kv.key[4] = reass->key.as_u64[4];
 268   kv.key[5] = reass->key.as_u64[5];
 269   clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
 270   vlib_buffer_free (vm, reass->cached_buffers,
 271                     vec_len (reass->cached_buffers));
 272   vec_free (reass->cached_buffers);
 273   reass->cached_buffers = NULL;
 274   if (~0 != reass->lru_prev)
 275     {
 276       ip6_sv_reass_t *lru_prev =
 277         pool_elt_at_index (rt->pool, reass->lru_prev);
 278       lru_prev->lru_next = reass->lru_next;
 279     }
 280   if (~0 != reass->lru_next)
 281     {
 282       ip6_sv_reass_t *lru_next =
 283         pool_elt_at_index (rt->pool, reass->lru_next);
 284       lru_next->lru_prev = reass->lru_prev;
 285     }
 286   if (rt->lru_first == reass - rt->pool)
 287     {
 288       rt->lru_first = reass->lru_next;
 289     }
 290   if (rt->lru_last == reass - rt->pool)
 291     {
 292       rt->lru_last = reass->lru_prev;
 293     }
 294   pool_put (rt->pool, reass);
 295   --rt->reass_n;
 296 }
 297
 298 always_inline void
 299 ip6_sv_reass_init (ip6_sv_reass_t * reass)
 300 {
 301   reass->cached_buffers = NULL;
 302   reass->is_complete = false;
 303 }
 304
 305 always_inline ip6_sv_reass_t *
 306 ip6_sv_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
 307                              ip6_sv_reass_main_t * rm,
 308                              ip6_sv_reass_per_thread_t * rt,
 309                              ip6_sv_reass_kv_t * kv, u32 * icmp_bi,
 310                              u8 * do_handoff)
 311 {
 312   ip6_sv_reass_t *reass = NULL;
 313   f64 now = vlib_time_now (vm);
 314
 315   if (!clib_bihash_search_48_8 (&rm->hash, &kv->kv, &kv->kv))
 316     {
 317       if (vm->thread_index != kv->v.thread_index)
 318         {
 319           *do_handoff = 1;
 320           return NULL;
 321         }
 322       reass = pool_elt_at_index (rt->pool, kv->v.reass_index);
 323
 324       if (now > reass->last_heard + rm->timeout)
 325         {
 326           ip6_sv_reass_free (vm, rm, rt, reass);
 327           reass = NULL;
 328         }
 329     }
 330
 331   if (reass)
 332     {
 333       reass->last_heard = now;
 334       return reass;
 335     }
 336
 337   if (rt->reass_n >= rm->max_reass_n)
 338     {
 339       reass = pool_elt_at_index (rt->pool, rt->lru_first);
 340       ip6_sv_reass_free (vm, rm, rt, reass);
 341     }
 342
 343   pool_get (rt->pool, reass);
 344   clib_memset (reass, 0, sizeof (*reass));
 345   reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 346   ++rt->id_counter;
 347   ip6_sv_reass_init (reass);
 348   ++rt->reass_n;
 349
 350   reass->lru_prev = reass->lru_next = ~0;
 351
 352   if (~0 != rt->lru_last)
 353     {
 354       ip6_sv_reass_t *lru_last = pool_elt_at_index (rt->pool, rt->lru_last);
 355       reass->lru_prev = rt->lru_last;
 356       lru_last->lru_next = rt->lru_last = reass - rt->pool;
 357     }
 358
 359   if (~0 == rt->lru_first)
 360     {
 361       rt->lru_first = rt->lru_last = reass - rt->pool;
 362     }
 363
 364   reass->key.as_u64[0] = kv->kv.key[0];
 365   reass->key.as_u64[1] = kv->kv.key[1];
 366   reass->key.as_u64[2] = kv->kv.key[2];
 367   reass->key.as_u64[3] = kv->kv.key[3];
 368   reass->key.as_u64[4] = kv->kv.key[4];
 369   reass->key.as_u64[5] = kv->kv.key[5];
 370   kv->v.reass_index = (reass - rt->pool);
 371   kv->v.thread_index = vm->thread_index;
 372   reass->last_heard = now;
 373
 374   if (clib_bihash_add_del_48_8 (&rm->hash, &kv->kv, 1))
 375     {
 376       ip6_sv_reass_free (vm, rm, rt, reass);
 377       reass = NULL;
 378     }
 379
 380   return reass;
 381 }
 382
 383 always_inline ip6_sv_reass_rc_t
 384 ip6_sv_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 385                      ip6_sv_reass_main_t * rm, ip6_sv_reass_per_thread_t * rt,
 386                      ip6_sv_reass_t * reass, u32 bi0,
 387                      ip6_frag_hdr_t * frag_hdr)
 388 {
 389   vlib_buffer_t *fb = vlib_get_buffer (vm, bi0);
 390   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 391   fvnb->ip.reass.ip6_frag_hdr_offset =
 392     (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
 393   ip6_header_t *fip = vlib_buffer_get_current (fb);
 394   if (fb->current_length < sizeof (*fip) ||
 395       fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
 396       fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
 397     {
 398       return IP6_SV_REASS_RC_INTERNAL_ERROR;
 399     }
 400
 401   u32 fragment_first = fvnb->ip.reass.fragment_first =
 402     ip6_frag_hdr_offset_bytes (frag_hdr);
 403   u32 fragment_length =
 404     vlib_buffer_length_in_chain (vm, fb) -
 405     (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 406   u32 fragment_last = fvnb->ip.reass.fragment_last =
 407     fragment_first + fragment_length - 1;
 408   fvnb->ip.reass.range_first = fragment_first;
 409   fvnb->ip.reass.range_last = fragment_last;
 410   fvnb->ip.reass.next_range_bi = ~0;
 411   if (0 == fragment_first)
 412     {
 413       if (!ip6_get_port
 414           (vm, fb, fip, fb->current_length, &reass->ip_proto,
 415            &reass->l4_src_port, &reass->l4_dst_port,
 416            &reass->icmp_type_or_tcp_flags, &reass->tcp_ack_number,
 417            &reass->tcp_seq_number))
 418         return IP6_SV_REASS_RC_UNSUPP_IP_PROTO;
 419
 420       reass->is_complete = true;
 421       vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
 422       if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 423         {
 424           ip6_sv_reass_add_trace (vm, node, rm, reass, bi0, REASS_FINISH,
 425                                   reass->ip_proto, reass->l4_src_port,
 426                                   reass->l4_dst_port);
 427         }
 428     }
 429   vec_add1 (reass->cached_buffers, bi0);
 430   if (!reass->is_complete)
 431     {
 432       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 433         {
 434           ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
 435                                   REASS_FRAGMENT_CACHE, reass->ip_proto,
 436                                   reass->l4_src_port, reass->l4_dst_port);
 437         }
 438       if (vec_len (reass->cached_buffers) > rm->max_reass_len)
 439         {
 440           return IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS;
 441         }
 442     }
 443   return IP6_SV_REASS_RC_OK;
 444 }
 445
 446 always_inline bool
 447 ip6_sv_reass_verify_upper_layer_present (vlib_node_runtime_t * node,
 448                                          vlib_buffer_t * b,
 449                                          ip6_frag_hdr_t * frag_hdr)
 450 {
 451   ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr;
 452   while (ip6_ext_hdr (tmp->next_hdr))
 453     {
 454       tmp = ip6_ext_next_header (tmp);
 455     }
 456   if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr)
 457     {
 458       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 459                                    ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
 460                                    0);
 461       b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
 462
 463       return false;
 464     }
 465   return true;
 466 }
 467
 468 always_inline bool
 469 ip6_sv_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
 470                                          vlib_node_runtime_t * node,
 471                                          vlib_buffer_t * b,
 472                                          ip6_frag_hdr_t * frag_hdr)
 473 {
 474   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 475   ip6_header_t *ip = vlib_buffer_get_current (b);
 476   int more_fragments = ip6_frag_hdr_more (frag_hdr);
 477   u32 fragment_length =
 478     vlib_buffer_length_in_chain (vm, b) -
 479     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 480   if (more_fragments && 0 != fragment_length % 8)
 481     {
 482       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 483                                    ICMP6_parameter_problem_erroneous_header_field,
 484                                    (u8 *) & ip->payload_length - (u8 *) ip);
 485       return false;
 486     }
 487   return true;
 488 }
 489
 490 always_inline bool
 491 ip6_sv_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
 492                                         vlib_node_runtime_t * node,
 493                                         vlib_buffer_t * b,
 494                                         ip6_frag_hdr_t * frag_hdr)
 495 {
 496   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 497   u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
 498   u32 fragment_length =
 499     vlib_buffer_length_in_chain (vm, b) -
 500     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 501   if (fragment_first + fragment_length > 65535)
 502     {
 503       ip6_header_t *ip0 = vlib_buffer_get_current (b);
 504       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 505                                    ICMP6_parameter_problem_erroneous_header_field,
 506                                    (u8 *) & frag_hdr->fragment_offset_and_more
 507                                    - (u8 *) ip0);
 508       return false;
 509     }
 510   return true;
 511 }
 512
 513 always_inline uword
 514 ip6_sv_reassembly_inline (vlib_main_t * vm,
 515                           vlib_node_runtime_t * node,
 516                           vlib_frame_t * frame, bool is_feature)
 517 {
 518   u32 *from = vlib_frame_vector_args (frame);
 519   u32 n_left_from, n_left_to_next, *to_next, next_index;
 520   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 521   ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
 522   clib_spinlock_lock (&rt->lock);
 523
 524   n_left_from = frame->n_vectors;
 525   next_index = node->cached_next_index;
 526
 527   while (n_left_from > 0)
 528     {
 529       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 530
 531       while (n_left_from > 0 && n_left_to_next > 0)
 532         {
 533           u32 bi0;
 534           vlib_buffer_t *b0;
 535           u32 next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 536           u32 error0 = IP6_ERROR_NONE;
 537           u32 icmp_bi = ~0;
 538
 539           bi0 = from[0];
 540           b0 = vlib_get_buffer (vm, bi0);
 541
 542           ip6_header_t *ip0 = vlib_buffer_get_current (b0);
 543           ip6_frag_hdr_t *frag_hdr = NULL;
 544           ip6_ext_header_t *prev_hdr;
 545           if (ip6_ext_hdr (ip0->protocol))
 546             {
 547               frag_hdr =
 548                 ip6_ext_header_find (vm, b0, ip0,
 549                                      IP_PROTOCOL_IPV6_FRAGMENTATION,
 550                                      &prev_hdr);
 551             }
 552           if (!frag_hdr)
 553             {
 554               // this is a regular packet - no fragmentation
 555               if (!ip6_get_port
 556                   (vm, b0, ip0, b0->current_length,
 557                    &(vnet_buffer (b0)->ip.reass.ip_proto),
 558                    &(vnet_buffer (b0)->ip.reass.l4_src_port),
 559                    &(vnet_buffer (b0)->ip.reass.l4_dst_port),
 560                    &(vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags),
 561                    &(vnet_buffer (b0)->ip.reass.tcp_ack_number),
 562                    &(vnet_buffer (b0)->ip.reass.tcp_seq_number)))
 563                 {
 564                   error0 = IP6_ERROR_REASS_UNSUPP_IP_PROTO;
 565                   b0->error = node->errors[error0];
 566                   next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 567                   goto packet_enqueue;
 568                 }
 569               vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
 570               next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
 571               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 572                 {
 573                   ip6_sv_reass_add_trace (vm, node, rm, NULL, bi0,
 574                                           REASS_PASSTHROUGH,
 575                                           vnet_buffer (b0)->ip.reass.ip_proto,
 576                                           vnet_buffer (b0)->ip.
 577                                           reass.l4_src_port,
 578                                           vnet_buffer (b0)->ip.
 579                                           reass.l4_dst_port);
 580                 }
 581               goto packet_enqueue;
 582             }
 583           vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
 584             (u8 *) frag_hdr - (u8 *) ip0;
 585           if (0 == ip6_frag_hdr_offset (frag_hdr))
 586             {
 587               // first fragment - verify upper-layer is present
 588               if (!ip6_sv_reass_verify_upper_layer_present
 589                   (node, b0, frag_hdr))
 590                 {
 591                   next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 592                   goto packet_enqueue;
 593                 }
 594             }
 595           if (!ip6_sv_reass_verify_fragment_multiple_8
 596               (vm, node, b0, frag_hdr)
 597               || !ip6_sv_reass_verify_packet_size_lt_64k (vm, node, b0,
 598                                                           frag_hdr))
 599             {
 600               next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 601               goto packet_enqueue;
 602             }
 603
 604           ip6_sv_reass_kv_t kv;
 605           u8 do_handoff = 0;
 606
 607           kv.k.as_u64[0] = ip0->src_address.as_u64[0];
 608           kv.k.as_u64[1] = ip0->src_address.as_u64[1];
 609           kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
 610           kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
 611           kv.k.as_u64[4] =
 612             ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
 613                             vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
 614             (u64) frag_hdr->identification;
 615           kv.k.as_u64[5] = ip0->protocol;
 616
 617           ip6_sv_reass_t *reass =
 618             ip6_sv_reass_find_or_create (vm, node, rm, rt, &kv, &icmp_bi,
 619                                          &do_handoff);
 620
 621           if (PREDICT_FALSE (do_handoff))
 622             {
 623               next0 = IP6_SV_REASSEMBLY_NEXT_HANDOFF;
 624               vnet_buffer (b0)->ip.reass.owner_thread_index =
 625                 kv.v.thread_index;
 626               goto packet_enqueue;
 627             }
 628
 629           if (!reass)
 630             {
 631               next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 632               error0 = IP6_ERROR_REASS_LIMIT_REACHED;
 633               b0->error = node->errors[error0];
 634               goto packet_enqueue;
 635             }
 636
 637           if (reass->is_complete)
 638             {
 639               vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 640                 ! !ip6_frag_hdr_offset (frag_hdr);
 641               vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 642               vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 643                 reass->icmp_type_or_tcp_flags;
 644               vnet_buffer (b0)->ip.reass.tcp_ack_number =
 645                 reass->tcp_ack_number;
 646               vnet_buffer (b0)->ip.reass.tcp_seq_number =
 647                 reass->tcp_seq_number;
 648               vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 649               vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 650               next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
 651               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 652                 {
 653                   ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
 654                                           REASS_FRAGMENT_FORWARD,
 655                                           reass->ip_proto,
 656                                           reass->l4_src_port,
 657                                           reass->l4_dst_port);
 658                 }
 659               goto packet_enqueue;
 660             }
 661
 662           switch (ip6_sv_reass_update
 663                   (vm, node, rm, rt, reass, bi0, frag_hdr))
 664             {
 665             case IP6_SV_REASS_RC_OK:
 666               /* nothing to do here */
 667               break;
 668             case IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS:
 669               vlib_node_increment_counter (vm, node->node_index,
 670                                            IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
 671                                            1);
 672               ip6_sv_reass_free (vm, rm, rt, reass);
 673               goto next_packet;
 674               break;
 675             case IP6_SV_REASS_RC_UNSUPP_IP_PROTO:
 676               vlib_node_increment_counter (vm, node->node_index,
 677                                            IP6_ERROR_REASS_UNSUPP_IP_PROTO,
 678                                            1);
 679               ip6_sv_reass_free (vm, rm, rt, reass);
 680               goto next_packet;
 681               break;
 682             case IP6_SV_REASS_RC_INTERNAL_ERROR:
 683               vlib_node_increment_counter (vm, node->node_index,
 684                                            IP6_ERROR_REASS_INTERNAL_ERROR, 1);
 685               ip6_sv_reass_free (vm, rm, rt, reass);
 686               goto next_packet;
 687               break;
 688             }
 689
 690           if (reass->is_complete)
 691             {
 692               u32 idx;
 693               vec_foreach_index (idx, reass->cached_buffers)
 694               {
 695                 u32 bi0 = vec_elt (reass->cached_buffers, idx);
 696                 if (0 == n_left_to_next)
 697                   {
 698                     vlib_put_next_frame (vm, node, next_index,
 699                                          n_left_to_next);
 700                     vlib_get_next_frame (vm, node, next_index, to_next,
 701                                          n_left_to_next);
 702                   }
 703                 to_next[0] = bi0;
 704                 to_next += 1;
 705                 n_left_to_next -= 1;
 706                 b0 = vlib_get_buffer (vm, bi0);
 707                 if (is_feature)
 708                   {
 709                     vnet_feature_next (&next0, b0);
 710                   }
 711                 frag_hdr =
 712                   vlib_buffer_get_current (b0) +
 713                   vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset;
 714                 vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 715                   ! !ip6_frag_hdr_offset (frag_hdr);
 716                 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 717                 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 718                   reass->icmp_type_or_tcp_flags;
 719                 vnet_buffer (b0)->ip.reass.tcp_ack_number =
 720                   reass->tcp_ack_number;
 721                 vnet_buffer (b0)->ip.reass.tcp_seq_number =
 722                   reass->tcp_seq_number;
 723                 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 724                 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 725                 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 726                   {
 727                     ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
 728                                             REASS_FRAGMENT_FORWARD,
 729                                             reass->ip_proto,
 730                                             reass->l4_src_port,
 731                                             reass->l4_dst_port);
 732                   }
 733                 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 734                                                  to_next, n_left_to_next, bi0,
 735                                                  next0);
 736               }
 737               _vec_len (reass->cached_buffers) = 0;     // buffers are owned by frame now
 738             }
 739           goto next_packet;
 740
 741         packet_enqueue:
 742           to_next[0] = bi0;
 743           to_next += 1;
 744           n_left_to_next -= 1;
 745           if (is_feature && IP6_ERROR_NONE == error0)
 746             {
 747               b0 = vlib_get_buffer (vm, bi0);
 748               vnet_feature_next (&next0, b0);
 749             }
 750           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 751                                            n_left_to_next, bi0, next0);
 752
 753           if (~0 != icmp_bi)
 754             {
 755               next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 756               to_next[0] = icmp_bi;
 757               to_next += 1;
 758               n_left_to_next -= 1;
 759               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 760                                                n_left_to_next, icmp_bi,
 761                                                next0);
 762             }
 763
 764         next_packet:
 765           from += 1;
 766           n_left_from -= 1;
 767         }
 768
 769       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 770     }
 771
 772   clib_spinlock_unlock (&rt->lock);
 773   return frame->n_vectors;
 774 }
 775
 776 static char *ip6_sv_reassembly_error_strings[] = {
 777 #define _(sym, string) string,
 778   foreach_ip6_error
 779 #undef _
 780 };
 781
 782 VLIB_NODE_FN (ip6_sv_reass_node) (vlib_main_t * vm,
 783                                   vlib_node_runtime_t * node,
 784                                   vlib_frame_t * frame)
 785 {
 786   return ip6_sv_reassembly_inline (vm, node, frame, false /* is_feature */ );
 787 }
 788
 789 /* *INDENT-OFF* */
 790 VLIB_REGISTER_NODE (ip6_sv_reass_node) = {
 791     .name = "ip6-sv-reassembly",
 792     .vector_size = sizeof (u32),
 793     .format_trace = format_ip6_sv_reass_trace,
 794     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
 795     .error_strings = ip6_sv_reassembly_error_strings,
 796     .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
 797     .next_nodes =
 798         {
 799                 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
 800                 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
 801                 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
 802                 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reassembly-handoff",
 803         },
 804 };
 805 /* *INDENT-ON* */
 806
 807 VLIB_NODE_FN (ip6_sv_reass_node_feature) (vlib_main_t * vm,
 808                                           vlib_node_runtime_t * node,
 809                                           vlib_frame_t * frame)
 810 {
 811   return ip6_sv_reassembly_inline (vm, node, frame, true /* is_feature */ );
 812 }
 813
 814 /* *INDENT-OFF* */
 815 VLIB_REGISTER_NODE (ip6_sv_reass_node_feature) = {
 816     .name = "ip6-sv-reassembly-feature",
 817     .vector_size = sizeof (u32),
 818     .format_trace = format_ip6_sv_reass_trace,
 819     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
 820     .error_strings = ip6_sv_reassembly_error_strings,
 821     .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
 822     .next_nodes =
 823         {
 824                 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
 825                 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
 826                 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
 827                 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reass-feature-hoff",
 828         },
 829 };
 830 /* *INDENT-ON* */
 831
 832 /* *INDENT-OFF* */
 833 VNET_FEATURE_INIT (ip6_sv_reassembly_feature) = {
 834     .arc_name = "ip6-unicast",
 835     .node_name = "ip6-sv-reassembly-feature",
 836     .runs_before = VNET_FEATURES ("ip6-lookup"),
 837     .runs_after = 0,
 838 };
 839 /* *INDENT-ON* */
 840
 841 #ifndef CLIB_MARCH_VARIANT
 842 static u32
 843 ip6_sv_reass_get_nbuckets ()
 844 {
 845   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 846   u32 nbuckets;
 847   u8 i;
 848
 849   nbuckets = (u32) (rm->max_reass_n / IP6_SV_REASS_HT_LOAD_FACTOR);
 850
 851   for (i = 0; i < 31; i++)
 852     if ((1 << i) >= nbuckets)
 853       break;
 854   nbuckets = 1 << i;
 855
 856   return nbuckets;
 857 }
 858 #endif /* CLIB_MARCH_VARIANT */
 859
 860 typedef enum
 861 {
 862   IP6_EVENT_CONFIG_CHANGED = 1,
 863 } ip6_sv_reass_event_t;
 864
 865 #ifndef CLIB_MARCH_VARIANT
 866 typedef struct
 867 {
 868   int failure;
 869   clib_bihash_48_8_t *new_hash;
 870 } ip6_rehash_cb_ctx;
 871
 872 static int
 873 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
 874 {
 875   ip6_rehash_cb_ctx *ctx = _ctx;
 876   if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
 877     {
 878       ctx->failure = 1;
 879     }
 880   return (BIHASH_WALK_CONTINUE);
 881 }
 882
 883 static void
 884 ip6_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
 885                          u32 max_reassembly_length,
 886                          u32 expire_walk_interval_ms)
 887 {
 888   ip6_sv_reass_main.timeout_ms = timeout_ms;
 889   ip6_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
 890   ip6_sv_reass_main.max_reass_n = max_reassemblies;
 891   ip6_sv_reass_main.max_reass_len = max_reassembly_length;
 892   ip6_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
 893 }
 894
 895 vnet_api_error_t
 896 ip6_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
 897                   u32 max_reassembly_length, u32 expire_walk_interval_ms)
 898 {
 899   u32 old_nbuckets = ip6_sv_reass_get_nbuckets ();
 900   ip6_sv_reass_set_params (timeout_ms, max_reassemblies,
 901                            max_reassembly_length, expire_walk_interval_ms);
 902   vlib_process_signal_event (ip6_sv_reass_main.vlib_main,
 903                              ip6_sv_reass_main.ip6_sv_reass_expire_node_idx,
 904                              IP6_EVENT_CONFIG_CHANGED, 0);
 905   u32 new_nbuckets = ip6_sv_reass_get_nbuckets ();
 906   if (ip6_sv_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
 907     {
 908       clib_bihash_48_8_t new_hash;
 909       clib_memset (&new_hash, 0, sizeof (new_hash));
 910       ip6_rehash_cb_ctx ctx;
 911       ctx.failure = 0;
 912       ctx.new_hash = &new_hash;
 913       clib_bihash_init_48_8 (&new_hash, "ip6-sv-reass", new_nbuckets,
 914                              new_nbuckets * 1024);
 915       clib_bihash_foreach_key_value_pair_48_8 (&ip6_sv_reass_main.hash,
 916                                                ip6_rehash_cb, &ctx);
 917       if (ctx.failure)
 918         {
 919           clib_bihash_free_48_8 (&new_hash);
 920           return -1;
 921         }
 922       else
 923         {
 924           clib_bihash_free_48_8 (&ip6_sv_reass_main.hash);
 925           clib_memcpy_fast (&ip6_sv_reass_main.hash, &new_hash,
 926                             sizeof (ip6_sv_reass_main.hash));
 927           clib_bihash_copied (&ip6_sv_reass_main.hash, &new_hash);
 928         }
 929     }
 930   return 0;
 931 }
 932
 933 vnet_api_error_t
 934 ip6_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
 935                   u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
 936 {
 937   *timeout_ms = ip6_sv_reass_main.timeout_ms;
 938   *max_reassemblies = ip6_sv_reass_main.max_reass_n;
 939   *max_reassembly_length = ip6_sv_reass_main.max_reass_len;
 940   *expire_walk_interval_ms = ip6_sv_reass_main.expire_walk_interval_ms;
 941   return 0;
 942 }
 943
 944 static clib_error_t *
 945 ip6_sv_reass_init_function (vlib_main_t * vm)
 946 {
 947   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 948   clib_error_t *error = 0;
 949   u32 nbuckets;
 950   vlib_node_t *node;
 951
 952   rm->vlib_main = vm;
 953   rm->vnet_main = vnet_get_main ();
 954
 955   vec_validate (rm->per_thread_data, vlib_num_workers ());
 956   ip6_sv_reass_per_thread_t *rt;
 957   vec_foreach (rt, rm->per_thread_data)
 958   {
 959     clib_spinlock_init (&rt->lock);
 960     pool_alloc (rt->pool, rm->max_reass_n);
 961     rt->lru_first = rt->lru_last = ~0;
 962   }
 963
 964   node = vlib_get_node_by_name (vm, (u8 *) "ip6-sv-reassembly-expire-walk");
 965   ASSERT (node);
 966   rm->ip6_sv_reass_expire_node_idx = node->index;
 967
 968   ip6_sv_reass_set_params (IP6_SV_REASS_TIMEOUT_DEFAULT_MS,
 969                            IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
 970                            IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
 971                            IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
 972
 973   nbuckets = ip6_sv_reass_get_nbuckets ();
 974   clib_bihash_init_48_8 (&rm->hash, "ip6-sv-reass", nbuckets,
 975                          nbuckets * 1024);
 976
 977   node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
 978   ASSERT (node);
 979   rm->ip6_drop_idx = node->index;
 980   node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
 981   ASSERT (node);
 982   rm->ip6_icmp_error_idx = node->index;
 983
 984   if ((error = vlib_call_init_function (vm, ip_main_init)))
 985     return error;
 986
 987   rm->fq_index = vlib_frame_queue_main_init (ip6_sv_reass_node.index, 0);
 988   rm->fq_feature_index =
 989     vlib_frame_queue_main_init (ip6_sv_reass_node_feature.index, 0);
 990
 991   rm->feature_use_refcount_per_intf = NULL;
 992
 993   return error;
 994 }
 995
 996 VLIB_INIT_FUNCTION (ip6_sv_reass_init_function);
 997 #endif /* CLIB_MARCH_VARIANT */
 998
 999 static uword
1000 ip6_sv_reass_walk_expired (vlib_main_t * vm,
1001                            vlib_node_runtime_t * node, vlib_frame_t * f)
1002 {
1003   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1004   uword event_type, *event_data = 0;
1005
1006   while (true)
1007     {
1008       vlib_process_wait_for_event_or_clock (vm,
1009                                             (f64) rm->expire_walk_interval_ms
1010                                             / (f64) MSEC_PER_SEC);
1011       event_type = vlib_process_get_events (vm, &event_data);
1012
1013       switch (event_type)
1014         {
1015         case ~0:                /* no events => timeout */
1016           /* nothing to do here */
1017           break;
1018         case IP6_EVENT_CONFIG_CHANGED:
1019           break;
1020         default:
1021           clib_warning ("BUG: event type 0x%wx", event_type);
1022           break;
1023         }
1024       f64 now = vlib_time_now (vm);
1025
1026       ip6_sv_reass_t *reass;
1027       int *pool_indexes_to_free = NULL;
1028
1029       uword thread_index = 0;
1030       int index;
1031       const uword nthreads = vlib_num_workers () + 1;
1032       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1033         {
1034           ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1035           clib_spinlock_lock (&rt->lock);
1036
1037           vec_reset_length (pool_indexes_to_free);
1038           /* *INDENT-OFF* */
1039           pool_foreach_index (index, rt->pool)  {
1040                                 reass = pool_elt_at_index (rt->pool, index);
1041                                 if (now > reass->last_heard + rm->timeout)
1042                                   {
1043                                     vec_add1 (pool_indexes_to_free, index);
1044                                   }
1045                               }
1046           /* *INDENT-ON* */
1047           int *i;
1048           /* *INDENT-OFF* */
1049           vec_foreach (i, pool_indexes_to_free)
1050           {
1051             ip6_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1052             ip6_sv_reass_free (vm, rm, rt, reass);
1053           }
1054           /* *INDENT-ON* */
1055
1056           clib_spinlock_unlock (&rt->lock);
1057         }
1058
1059       vec_free (pool_indexes_to_free);
1060       if (event_data)
1061         {
1062           _vec_len (event_data) = 0;
1063         }
1064     }
1065
1066   return 0;
1067 }
1068
1069 /* *INDENT-OFF* */
1070 VLIB_REGISTER_NODE (ip6_sv_reass_expire_node) = {
1071     .function = ip6_sv_reass_walk_expired,
1072     .format_trace = format_ip6_sv_reass_trace,
1073     .type = VLIB_NODE_TYPE_PROCESS,
1074     .name = "ip6-sv-reassembly-expire-walk",
1075
1076     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
1077     .error_strings = ip6_sv_reassembly_error_strings,
1078
1079 };
1080 /* *INDENT-ON* */
1081
1082 static u8 *
1083 format_ip6_sv_reass_key (u8 * s, va_list * args)
1084 {
1085   ip6_sv_reass_key_t *key = va_arg (*args, ip6_sv_reass_key_t *);
1086   s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1087               key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1088               &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1089   return s;
1090 }
1091
1092 static u8 *
1093 format_ip6_sv_reass (u8 * s, va_list * args)
1094 {
1095   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1096   ip6_sv_reass_t *reass = va_arg (*args, ip6_sv_reass_t *);
1097
1098   s = format (s, "ID: %lu, key: %U, trace_op_counter: %u\n",
1099               reass->id, format_ip6_sv_reass_key, &reass->key,
1100               reass->trace_op_counter);
1101   vlib_buffer_t *b;
1102   u32 *bip;
1103   u32 counter = 0;
1104   vec_foreach (bip, reass->cached_buffers)
1105   {
1106     u32 bi = *bip;
1107     do
1108       {
1109         b = vlib_get_buffer (vm, bi);
1110         s = format (s, "  #%03u: bi: %u\n", counter, bi);
1111         ++counter;
1112         bi = b->next_buffer;
1113       }
1114     while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1115   }
1116   return s;
1117 }
1118
1119 static clib_error_t *
1120 show_ip6_sv_reass (vlib_main_t * vm, unformat_input_t * input,
1121                    CLIB_UNUSED (vlib_cli_command_t * lmd))
1122 {
1123   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1124
1125   vlib_cli_output (vm, "---------------------");
1126   vlib_cli_output (vm, "IP6 reassembly status");
1127   vlib_cli_output (vm, "---------------------");
1128   bool details = false;
1129   if (unformat (input, "details"))
1130     {
1131       details = true;
1132     }
1133
1134   u32 sum_reass_n = 0;
1135   u64 sum_buffers_n = 0;
1136   ip6_sv_reass_t *reass;
1137   uword thread_index;
1138   const uword nthreads = vlib_num_workers () + 1;
1139   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1140     {
1141       ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1142       clib_spinlock_lock (&rt->lock);
1143       if (details)
1144         {
1145           /* *INDENT-OFF* */
1146           pool_foreach (reass, rt->pool) {
1147             vlib_cli_output (vm, "%U", format_ip6_sv_reass, vm, reass);
1148           }
1149           /* *INDENT-ON* */
1150         }
1151       sum_reass_n += rt->reass_n;
1152       clib_spinlock_unlock (&rt->lock);
1153     }
1154   vlib_cli_output (vm, "---------------------");
1155   vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1156                    (long unsigned) sum_reass_n);
1157   vlib_cli_output (vm,
1158                    "Maximum configured concurrent shallow virtual IP6 reassemblies per worker-thread: %lu\n",
1159                    (long unsigned) rm->max_reass_n);
1160   vlib_cli_output (vm,
1161                    "Maximum configured amount of fragments per shallow "
1162                    "virtual IP6 reassembly: %lu\n",
1163                    (long unsigned) rm->max_reass_len);
1164   vlib_cli_output (vm,
1165                    "Maximum configured shallow virtual IP6 reassembly timeout: %lums\n",
1166                    (long unsigned) rm->timeout_ms);
1167   vlib_cli_output (vm,
1168                    "Maximum configured shallow virtual IP6 reassembly expire walk interval: %lums\n",
1169                    (long unsigned) rm->expire_walk_interval_ms);
1170   vlib_cli_output (vm, "Buffers in use: %lu\n",
1171                    (long unsigned) sum_buffers_n);
1172   return 0;
1173 }
1174
1175 /* *INDENT-OFF* */
1176 VLIB_CLI_COMMAND (show_ip6_sv_reassembly_cmd, static) = {
1177     .path = "show ip6-sv-reassembly",
1178     .short_help = "show ip6-sv-reassembly [details]",
1179     .function = show_ip6_sv_reass,
1180 };
1181 /* *INDENT-ON* */
1182
1183 #ifndef CLIB_MARCH_VARIANT
1184 vnet_api_error_t
1185 ip6_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1186 {
1187   return ip6_sv_reass_enable_disable_with_refcnt (sw_if_index,
1188                                                   enable_disable);
1189 }
1190 #endif /* CLIB_MARCH_VARIANT */
1191
1192 #define foreach_ip6_sv_reassembly_handoff_error                       \
1193 _(CONGESTION_DROP, "congestion drop")
1194
1195
1196 typedef enum
1197 {
1198 #define _(sym,str) IP6_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
1199   foreach_ip6_sv_reassembly_handoff_error
1200 #undef _
1201     IP6_SV_REASSEMBLY_HANDOFF_N_ERROR,
1202 } ip6_sv_reassembly_handoff_error_t;
1203
1204 static char *ip6_sv_reassembly_handoff_error_strings[] = {
1205 #define _(sym,string) string,
1206   foreach_ip6_sv_reassembly_handoff_error
1207 #undef _
1208 };
1209
1210 typedef struct
1211 {
1212   u32 next_worker_index;
1213 } ip6_sv_reassembly_handoff_trace_t;
1214
1215 static u8 *
1216 format_ip6_sv_reassembly_handoff_trace (u8 * s, va_list * args)
1217 {
1218   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1219   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1220   ip6_sv_reassembly_handoff_trace_t *t =
1221     va_arg (*args, ip6_sv_reassembly_handoff_trace_t *);
1222
1223   s =
1224     format (s, "ip6-sv-reassembly-handoff: next-worker %d",
1225             t->next_worker_index);
1226
1227   return s;
1228 }
1229
1230 always_inline uword
1231 ip6_sv_reassembly_handoff_inline (vlib_main_t * vm,
1232                                   vlib_node_runtime_t * node,
1233                                   vlib_frame_t * frame, bool is_feature)
1234 {
1235   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1236
1237   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1238   u32 n_enq, n_left_from, *from;
1239   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1240   u32 fq_index;
1241
1242   from = vlib_frame_vector_args (frame);
1243   n_left_from = frame->n_vectors;
1244   vlib_get_buffers (vm, from, bufs, n_left_from);
1245
1246   b = bufs;
1247   ti = thread_indices;
1248
1249   fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1250
1251   while (n_left_from > 0)
1252     {
1253       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1254
1255       if (PREDICT_FALSE
1256           ((node->flags & VLIB_NODE_FLAG_TRACE)
1257            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1258         {
1259           ip6_sv_reassembly_handoff_trace_t *t =
1260             vlib_add_trace (vm, node, b[0], sizeof (*t));
1261           t->next_worker_index = ti[0];
1262         }
1263
1264       n_left_from -= 1;
1265       ti += 1;
1266       b += 1;
1267     }
1268   n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from,
1269                                          thread_indices, frame->n_vectors, 1);
1270
1271   if (n_enq < frame->n_vectors)
1272     vlib_node_increment_counter (vm, node->node_index,
1273                                  IP6_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1274                                  frame->n_vectors - n_enq);
1275   return frame->n_vectors;
1276 }
1277
1278 VLIB_NODE_FN (ip6_sv_reassembly_handoff_node) (vlib_main_t * vm,
1279                                                vlib_node_runtime_t * node,
1280                                                vlib_frame_t * frame)
1281 {
1282   return ip6_sv_reassembly_handoff_inline (vm, node, frame,
1283                                            false /* is_feature */ );
1284 }
1285
1286 /* *INDENT-OFF* */
1287 VLIB_REGISTER_NODE (ip6_sv_reassembly_handoff_node) = {
1288   .name = "ip6-sv-reassembly-handoff",
1289   .vector_size = sizeof (u32),
1290   .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1291   .error_strings = ip6_sv_reassembly_handoff_error_strings,
1292   .format_trace = format_ip6_sv_reassembly_handoff_trace,
1293
1294   .n_next_nodes = 1,
1295
1296   .next_nodes = {
1297     [0] = "error-drop",
1298   },
1299 };
1300
1301
1302 VLIB_NODE_FN (ip6_sv_reassembly_feature_handoff_node) (vlib_main_t * vm,
1303                                vlib_node_runtime_t * node, vlib_frame_t * frame)
1304 {
1305   return ip6_sv_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1306 }
1307
1308
1309 /* *INDENT-OFF* */
1310 VLIB_REGISTER_NODE (ip6_sv_reassembly_feature_handoff_node) = {
1311   .name = "ip6-sv-reass-feature-hoff",
1312   .vector_size = sizeof (u32),
1313   .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1314   .error_strings = ip6_sv_reassembly_handoff_error_strings,
1315   .format_trace = format_ip6_sv_reassembly_handoff_trace,
1316
1317   .n_next_nodes = 1,
1318
1319   .next_nodes = {
1320     [0] = "error-drop",
1321   },
1322 };
1323 /* *INDENT-ON* */
1324
1325 #ifndef CLIB_MARCH_VARIANT
1326 int
1327 ip6_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1328 {
1329   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1330   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1331   if (is_enable)
1332     {
1333       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1334         {
1335           ++rm->feature_use_refcount_per_intf[sw_if_index];
1336           return vnet_feature_enable_disable ("ip6-unicast",
1337                                               "ip6-sv-reassembly-feature",
1338                                               sw_if_index, 1, 0, 0);
1339         }
1340       ++rm->feature_use_refcount_per_intf[sw_if_index];
1341     }
1342   else
1343     {
1344       --rm->feature_use_refcount_per_intf[sw_if_index];
1345       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1346         return vnet_feature_enable_disable ("ip6-unicast",
1347                                             "ip6-sv-reassembly-feature",
1348                                             sw_if_index, 0, 0, 0);
1349     }
1350   return 0;
1351 }
1352 #endif
1353
1354 /*
1355  * fd.io coding-style-patch-verification: ON
1356  *
1357  * Local Variables:
1358  * eval: (c-set-style "gnu")
1359  * End:
1360  */