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 #include <vnet/ip/ip6_inlines.h>
  30
  31 #define MSEC_PER_SEC 1000
  32 #define IP6_SV_REASS_TIMEOUT_DEFAULT_MS 100
  33 #define IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000      // 10 seconds default
  34 #define IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT 1024
  35 #define IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
  36 #define IP6_SV_REASS_HT_LOAD_FACTOR (0.75)
  37
  38 typedef enum
  39 {
  40   IP6_SV_REASS_RC_OK,
  41   IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS,
  42   IP6_SV_REASS_RC_INTERNAL_ERROR,
  43   IP6_SV_REASS_RC_UNSUPP_IP_PROTO,
  44   IP6_SV_REASS_RC_INVALID_FRAG_LEN,
  45 } ip6_sv_reass_rc_t;
  46
  47 typedef struct
  48 {
  49   union
  50   {
  51     struct
  52     {
  53       ip6_address_t src;
  54       ip6_address_t dst;
  55       u32 fib_index;
  56       u32 frag_id;
  57       u8 unused[7];
  58       u8 proto;
  59     };
  60     u64 as_u64[6];
  61   };
  62 } ip6_sv_reass_key_t;
  63
  64 typedef union
  65 {
  66   struct
  67   {
  68     u32 reass_index;
  69     u32 thread_index;
  70   };
  71   u64 as_u64;
  72 } ip6_sv_reass_val_t;
  73
  74 typedef union
  75 {
  76   struct
  77   {
  78     ip6_sv_reass_key_t k;
  79     ip6_sv_reass_val_t v;
  80   };
  81   clib_bihash_kv_48_8_t kv;
  82 } ip6_sv_reass_kv_t;
  83
  84 typedef struct
  85 {
  86   // hash table key
  87   ip6_sv_reass_key_t key;
  88   // time when last packet was received
  89   f64 last_heard;
  90   // internal id of this reassembly
  91   u64 id;
  92   // trace operation counter
  93   u32 trace_op_counter;
  94   // buffer indexes of buffers in this reassembly in chronological order -
  95   // including overlaps and duplicate fragments
  96   u32 *cached_buffers;
  97   // set to true when this reassembly is completed
  98   bool is_complete;
  99   // ip protocol
 100   u8 ip_proto;
 101   u8 icmp_type_or_tcp_flags;
 102   u32 tcp_ack_number;
 103   u32 tcp_seq_number;
 104   // l4 src port
 105   u16 l4_src_port;
 106   // l4 dst port
 107   u16 l4_dst_port;
 108   // lru indexes
 109   u32 lru_prev;
 110   u32 lru_next;
 111 } ip6_sv_reass_t;
 112
 113 typedef struct
 114 {
 115   ip6_sv_reass_t *pool;
 116   u32 reass_n;
 117   u32 id_counter;
 118   clib_spinlock_t lock;
 119   // lru indexes
 120   u32 lru_first;
 121   u32 lru_last;
 122 } ip6_sv_reass_per_thread_t;
 123
 124 typedef struct
 125 {
 126   // IPv6 config
 127   u32 timeout_ms;
 128   f64 timeout;
 129   u32 expire_walk_interval_ms;
 130   // maximum number of fragments in one reassembly
 131   u32 max_reass_len;
 132   // maximum number of reassemblies
 133   u32 max_reass_n;
 134
 135   // IPv6 runtime
 136   clib_bihash_48_8_t hash;
 137
 138   // per-thread data
 139   ip6_sv_reass_per_thread_t *per_thread_data;
 140
 141   // convenience
 142   vlib_main_t *vlib_main;
 143   vnet_main_t *vnet_main;
 144
 145   // node index of ip6-drop node
 146   u32 ip6_drop_idx;
 147   u32 ip6_icmp_error_idx;
 148   u32 ip6_sv_reass_expire_node_idx;
 149
 150   /** Worker handoff */
 151   u32 fq_index;
 152   u32 fq_feature_index;
 153
 154   // reference count for enabling/disabling feature - per interface
 155   u32 *feature_use_refcount_per_intf;
 156 } ip6_sv_reass_main_t;
 157
 158 extern ip6_sv_reass_main_t ip6_sv_reass_main;
 159
 160 #ifndef CLIB_MARCH_VARIANT
 161 ip6_sv_reass_main_t ip6_sv_reass_main;
 162 #endif /* CLIB_MARCH_VARIANT */
 163
 164 typedef enum
 165 {
 166   IP6_SV_REASSEMBLY_NEXT_INPUT,
 167   IP6_SV_REASSEMBLY_NEXT_DROP,
 168   IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR,
 169   IP6_SV_REASSEMBLY_NEXT_HANDOFF,
 170   IP6_SV_REASSEMBLY_N_NEXT,
 171 } ip6_sv_reass_next_t;
 172
 173 typedef enum
 174 {
 175   REASS_FRAGMENT_CACHE,
 176   REASS_FINISH,
 177   REASS_FRAGMENT_FORWARD,
 178   REASS_PASSTHROUGH,
 179 } ip6_sv_reass_trace_operation_e;
 180
 181 typedef struct
 182 {
 183   ip6_sv_reass_trace_operation_e action;
 184   u32 reass_id;
 185   u32 op_id;
 186   u8 ip_proto;
 187   u16 l4_src_port;
 188   u16 l4_dst_port;
 189 } ip6_sv_reass_trace_t;
 190
 191 static u8 *
 192 format_ip6_sv_reass_trace (u8 * s, va_list * args)
 193 {
 194   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 195   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 196   ip6_sv_reass_trace_t *t = va_arg (*args, ip6_sv_reass_trace_t *);
 197   if (REASS_PASSTHROUGH != t->action)
 198     {
 199       s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
 200     }
 201   switch (t->action)
 202     {
 203     case REASS_FRAGMENT_CACHE:
 204       s = format (s, "[cached]");
 205       break;
 206     case REASS_FINISH:
 207       s =
 208         format (s, "[finish, ip proto=%u, src_port=%u, dst_port=%u]",
 209                 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
 210                 clib_net_to_host_u16 (t->l4_dst_port));
 211       break;
 212     case REASS_FRAGMENT_FORWARD:
 213       s =
 214         format (s, "[forward, ip proto=%u, src_port=%u, dst_port=%u]",
 215                 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
 216                 clib_net_to_host_u16 (t->l4_dst_port));
 217       break;
 218     case REASS_PASSTHROUGH:
 219       s = format (s, "[not fragmented or atomic fragment]");
 220       break;
 221     }
 222   return s;
 223 }
 224
 225 static void
 226 ip6_sv_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 227                         ip6_sv_reass_t * reass, u32 bi,
 228                         ip6_sv_reass_trace_operation_e action,
 229                         u32 ip_proto, u16 l4_src_port, u16 l4_dst_port)
 230 {
 231   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 232   if (pool_is_free_index
 233       (vm->trace_main.trace_buffer_pool, vlib_buffer_get_trace_index (b)))
 234     {
 235       // this buffer's trace is gone
 236       b->flags &= ~VLIB_BUFFER_IS_TRACED;
 237       return;
 238     }
 239   ip6_sv_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 240   if (reass)
 241     {
 242       t->reass_id = reass->id;
 243       t->op_id = reass->trace_op_counter;
 244       ++reass->trace_op_counter;
 245     }
 246   t->action = action;
 247   t->ip_proto = ip_proto;
 248   t->l4_src_port = l4_src_port;
 249   t->l4_dst_port = l4_dst_port;
 250 #if 0
 251   static u8 *s = NULL;
 252   s = format (s, "%U", format_ip6_sv_reass_trace, NULL, NULL, t);
 253   printf ("%.*s\n", vec_len (s), s);
 254   fflush (stdout);
 255   vec_reset_length (s);
 256 #endif
 257 }
 258
 259 always_inline void
 260 ip6_sv_reass_free (vlib_main_t * vm, ip6_sv_reass_main_t * rm,
 261                    ip6_sv_reass_per_thread_t * rt, ip6_sv_reass_t * reass)
 262 {
 263   clib_bihash_kv_48_8_t kv;
 264   kv.key[0] = reass->key.as_u64[0];
 265   kv.key[1] = reass->key.as_u64[1];
 266   kv.key[2] = reass->key.as_u64[2];
 267   kv.key[3] = reass->key.as_u64[3];
 268   kv.key[4] = reass->key.as_u64[4];
 269   kv.key[5] = reass->key.as_u64[5];
 270   clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
 271   vlib_buffer_free (vm, reass->cached_buffers,
 272                     vec_len (reass->cached_buffers));
 273   vec_free (reass->cached_buffers);
 274   reass->cached_buffers = NULL;
 275   if (~0 != reass->lru_prev)
 276     {
 277       ip6_sv_reass_t *lru_prev =
 278         pool_elt_at_index (rt->pool, reass->lru_prev);
 279       lru_prev->lru_next = reass->lru_next;
 280     }
 281   if (~0 != reass->lru_next)
 282     {
 283       ip6_sv_reass_t *lru_next =
 284         pool_elt_at_index (rt->pool, reass->lru_next);
 285       lru_next->lru_prev = reass->lru_prev;
 286     }
 287   if (rt->lru_first == reass - rt->pool)
 288     {
 289       rt->lru_first = reass->lru_next;
 290     }
 291   if (rt->lru_last == reass - rt->pool)
 292     {
 293       rt->lru_last = reass->lru_prev;
 294     }
 295   pool_put (rt->pool, reass);
 296   --rt->reass_n;
 297 }
 298
 299 always_inline void
 300 ip6_sv_reass_init (ip6_sv_reass_t * reass)
 301 {
 302   reass->cached_buffers = NULL;
 303   reass->is_complete = false;
 304 }
 305
 306 always_inline ip6_sv_reass_t *
 307 ip6_sv_reass_find_or_create (vlib_main_t *vm, ip6_sv_reass_main_t *rm,
 308                              ip6_sv_reass_per_thread_t *rt,
 309                              ip6_sv_reass_kv_t *kv, u8 *do_handoff)
 310 {
 311   ip6_sv_reass_t *reass = NULL;
 312   f64 now = vlib_time_now (vm);
 313
 314 again:
 315
 316   if (!clib_bihash_search_48_8 (&rm->hash, &kv->kv, &kv->kv))
 317     {
 318       if (vm->thread_index != kv->v.thread_index)
 319         {
 320           *do_handoff = 1;
 321           return NULL;
 322         }
 323       reass = pool_elt_at_index (rt->pool, kv->v.reass_index);
 324
 325       if (now > reass->last_heard + rm->timeout)
 326         {
 327           ip6_sv_reass_free (vm, rm, rt, reass);
 328           reass = NULL;
 329         }
 330     }
 331
 332   if (reass)
 333     {
 334       reass->last_heard = now;
 335       return reass;
 336     }
 337
 338   if (rt->reass_n >= rm->max_reass_n)
 339     {
 340       reass = pool_elt_at_index (rt->pool, rt->lru_first);
 341       ip6_sv_reass_free (vm, rm, rt, reass);
 342     }
 343
 344   pool_get (rt->pool, reass);
 345   clib_memset (reass, 0, sizeof (*reass));
 346   reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 347   ++rt->id_counter;
 348   ip6_sv_reass_init (reass);
 349   ++rt->reass_n;
 350
 351   reass->lru_prev = reass->lru_next = ~0;
 352
 353   if (~0 != rt->lru_last)
 354     {
 355       ip6_sv_reass_t *lru_last = pool_elt_at_index (rt->pool, rt->lru_last);
 356       reass->lru_prev = rt->lru_last;
 357       lru_last->lru_next = rt->lru_last = reass - rt->pool;
 358     }
 359
 360   if (~0 == rt->lru_first)
 361     {
 362       rt->lru_first = rt->lru_last = reass - rt->pool;
 363     }
 364
 365   reass->key.as_u64[0] = kv->kv.key[0];
 366   reass->key.as_u64[1] = kv->kv.key[1];
 367   reass->key.as_u64[2] = kv->kv.key[2];
 368   reass->key.as_u64[3] = kv->kv.key[3];
 369   reass->key.as_u64[4] = kv->kv.key[4];
 370   reass->key.as_u64[5] = kv->kv.key[5];
 371   kv->v.reass_index = (reass - rt->pool);
 372   kv->v.thread_index = vm->thread_index;
 373   reass->last_heard = now;
 374
 375   int rv = clib_bihash_add_del_48_8 (&rm->hash, &kv->kv, 2);
 376   if (rv)
 377     {
 378       ip6_sv_reass_free (vm, rm, rt, reass);
 379       reass = NULL;
 380       // if other worker created a context already work with the other copy
 381       if (-2 == rv)
 382         goto again;
 383     }
 384
 385   return reass;
 386 }
 387
 388 always_inline ip6_sv_reass_rc_t
 389 ip6_sv_reass_update (vlib_main_t *vm, vlib_node_runtime_t *node,
 390                      ip6_sv_reass_main_t *rm, ip6_sv_reass_t *reass, u32 bi0,
 391                      ip6_frag_hdr_t *frag_hdr)
 392 {
 393   vlib_buffer_t *fb = vlib_get_buffer (vm, bi0);
 394   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 395   fvnb->ip.reass.ip6_frag_hdr_offset =
 396     (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
 397   ip6_header_t *fip = vlib_buffer_get_current (fb);
 398   if (fb->current_length < sizeof (*fip) ||
 399       fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
 400       fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
 401     {
 402       return IP6_SV_REASS_RC_INTERNAL_ERROR;
 403     }
 404
 405   u32 fragment_first = fvnb->ip.reass.fragment_first =
 406     ip6_frag_hdr_offset_bytes (frag_hdr);
 407   u32 fragment_length =
 408     vlib_buffer_length_in_chain (vm, fb) -
 409     (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 410   if (0 == fragment_length)
 411     {
 412       return IP6_SV_REASS_RC_INVALID_FRAG_LEN;
 413     }
 414   u32 fragment_last = fvnb->ip.reass.fragment_last =
 415     fragment_first + fragment_length - 1;
 416   fvnb->ip.reass.range_first = fragment_first;
 417   fvnb->ip.reass.range_last = fragment_last;
 418   fvnb->ip.reass.next_range_bi = ~0;
 419   if (0 == fragment_first)
 420     {
 421       if (!ip6_get_port
 422           (vm, fb, fip, fb->current_length, &reass->ip_proto,
 423            &reass->l4_src_port, &reass->l4_dst_port,
 424            &reass->icmp_type_or_tcp_flags, &reass->tcp_ack_number,
 425            &reass->tcp_seq_number))
 426         return IP6_SV_REASS_RC_UNSUPP_IP_PROTO;
 427
 428       reass->is_complete = true;
 429       vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
 430       if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 431         {
 432           ip6_sv_reass_add_trace (vm, node, reass, bi0, REASS_FINISH,
 433                                   reass->ip_proto, reass->l4_src_port,
 434                                   reass->l4_dst_port);
 435         }
 436     }
 437   vec_add1 (reass->cached_buffers, bi0);
 438   if (!reass->is_complete)
 439     {
 440       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 441         {
 442           ip6_sv_reass_add_trace (vm, node, reass, bi0, REASS_FRAGMENT_CACHE,
 443                                   reass->ip_proto, reass->l4_src_port,
 444                                   reass->l4_dst_port);
 445         }
 446       if (vec_len (reass->cached_buffers) > rm->max_reass_len)
 447         {
 448           return IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS;
 449         }
 450     }
 451   return IP6_SV_REASS_RC_OK;
 452 }
 453
 454 always_inline bool
 455 ip6_sv_reass_verify_upper_layer_present (vlib_node_runtime_t *node,
 456                                          vlib_buffer_t *b,
 457                                          ip6_ext_hdr_chain_t *hc)
 458 {
 459   int nh = hc->eh[hc->length - 1].protocol;
 460   /* Checking to see if it's a terminating header */
 461   if (ip6_ext_hdr (nh))
 462     {
 463       icmp6_error_set_vnet_buffer (
 464         b, ICMP6_parameter_problem,
 465         ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain, 0);
 466       b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
 467       return false;
 468     }
 469   return true;
 470 }
 471
 472 always_inline bool
 473 ip6_sv_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
 474                                          vlib_buffer_t * b,
 475                                          ip6_frag_hdr_t * frag_hdr)
 476 {
 477   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 478   ip6_header_t *ip = vlib_buffer_get_current (b);
 479   int more_fragments = ip6_frag_hdr_more (frag_hdr);
 480   u32 fragment_length =
 481     vlib_buffer_length_in_chain (vm, b) -
 482     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 483   if (more_fragments && 0 != fragment_length % 8)
 484     {
 485       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 486                                    ICMP6_parameter_problem_erroneous_header_field,
 487                                    (u8 *) & ip->payload_length - (u8 *) ip);
 488       return false;
 489     }
 490   return true;
 491 }
 492
 493 always_inline bool
 494 ip6_sv_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
 495                                         vlib_buffer_t * b,
 496                                         ip6_frag_hdr_t * frag_hdr)
 497 {
 498   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 499   u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
 500   u32 fragment_length =
 501     vlib_buffer_length_in_chain (vm, b) -
 502     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 503   if (fragment_first + fragment_length > 65535)
 504     {
 505       ip6_header_t *ip0 = vlib_buffer_get_current (b);
 506       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 507                                    ICMP6_parameter_problem_erroneous_header_field,
 508                                    (u8 *) & frag_hdr->fragment_offset_and_more
 509                                    - (u8 *) ip0);
 510       return false;
 511     }
 512   return true;
 513 }
 514
 515 always_inline uword
 516 ip6_sv_reassembly_inline (vlib_main_t * vm,
 517                           vlib_node_runtime_t * node,
 518                           vlib_frame_t * frame, bool is_feature)
 519 {
 520   u32 *from = vlib_frame_vector_args (frame);
 521   u32 n_left_from, n_left_to_next, *to_next, next_index;
 522   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 523   ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
 524   clib_spinlock_lock (&rt->lock);
 525
 526   n_left_from = frame->n_vectors;
 527   next_index = node->cached_next_index;
 528
 529   while (n_left_from > 0)
 530     {
 531       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 532
 533       while (n_left_from > 0 && n_left_to_next > 0)
 534         {
 535           u32 bi0;
 536           vlib_buffer_t *b0;
 537           u32 next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 538           u32 error0 = IP6_ERROR_NONE;
 539
 540           bi0 = from[0];
 541           b0 = vlib_get_buffer (vm, bi0);
 542
 543           ip6_header_t *ip0 = vlib_buffer_get_current (b0);
 544           ip6_frag_hdr_t *frag_hdr;
 545           ip6_ext_hdr_chain_t hdr_chain;
 546           bool is_atomic_fragment = false;
 547
 548           int res = ip6_ext_header_walk (
 549             b0, ip0, IP_PROTOCOL_IPV6_FRAGMENTATION, &hdr_chain);
 550           if (res >= 0 &&
 551               hdr_chain.eh[res].protocol == IP_PROTOCOL_IPV6_FRAGMENTATION)
 552             {
 553               frag_hdr =
 554                 ip6_ext_next_header_offset (ip0, hdr_chain.eh[res].offset);
 555               is_atomic_fragment = (0 == ip6_frag_hdr_offset (frag_hdr) &&
 556                                     !ip6_frag_hdr_more (frag_hdr));
 557             }
 558
 559           if (res < 0 ||
 560               hdr_chain.eh[res].protocol != IP_PROTOCOL_IPV6_FRAGMENTATION ||
 561               is_atomic_fragment)
 562             {
 563               // this is a regular unfragmented packet or an atomic fragment
 564               if (!ip6_get_port
 565                   (vm, b0, ip0, b0->current_length,
 566                    &(vnet_buffer (b0)->ip.reass.ip_proto),
 567                    &(vnet_buffer (b0)->ip.reass.l4_src_port),
 568                    &(vnet_buffer (b0)->ip.reass.l4_dst_port),
 569                    &(vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags),
 570                    &(vnet_buffer (b0)->ip.reass.tcp_ack_number),
 571                    &(vnet_buffer (b0)->ip.reass.tcp_seq_number)))
 572                 {
 573                   error0 = IP6_ERROR_REASS_UNSUPP_IP_PROTO;
 574                   b0->error = node->errors[error0];
 575                   next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 576                   goto packet_enqueue;
 577                 }
 578               vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
 579               next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
 580               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 581                 {
 582                   ip6_sv_reass_add_trace (
 583                     vm, node, NULL, bi0, REASS_PASSTHROUGH,
 584                     vnet_buffer (b0)->ip.reass.ip_proto,
 585                     vnet_buffer (b0)->ip.reass.l4_src_port,
 586                     vnet_buffer (b0)->ip.reass.l4_dst_port);
 587                 }
 588               goto packet_enqueue;
 589             }
 590
 591           vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
 592             hdr_chain.eh[res].offset;
 593
 594           if (0 == ip6_frag_hdr_offset (frag_hdr))
 595             {
 596               // first fragment - verify upper-layer is present
 597               if (!ip6_sv_reass_verify_upper_layer_present (node, b0,
 598                                                             &hdr_chain))
 599                 {
 600                   next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 601                   goto packet_enqueue;
 602                 }
 603             }
 604           if (!ip6_sv_reass_verify_fragment_multiple_8 (vm, b0, frag_hdr) ||
 605               !ip6_sv_reass_verify_packet_size_lt_64k (vm, b0, frag_hdr))
 606             {
 607               next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 608               goto packet_enqueue;
 609             }
 610
 611           ip6_sv_reass_kv_t kv;
 612           u8 do_handoff = 0;
 613
 614           kv.k.as_u64[0] = ip0->src_address.as_u64[0];
 615           kv.k.as_u64[1] = ip0->src_address.as_u64[1];
 616           kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
 617           kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
 618           kv.k.as_u64[4] =
 619             ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
 620                             vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
 621             (u64) frag_hdr->identification;
 622           kv.k.as_u64[5] = ip0->protocol;
 623
 624           ip6_sv_reass_t *reass =
 625             ip6_sv_reass_find_or_create (vm, rm, rt, &kv, &do_handoff);
 626
 627           if (PREDICT_FALSE (do_handoff))
 628             {
 629               next0 = IP6_SV_REASSEMBLY_NEXT_HANDOFF;
 630               vnet_buffer (b0)->ip.reass.owner_thread_index =
 631                 kv.v.thread_index;
 632               goto packet_enqueue;
 633             }
 634
 635           if (!reass)
 636             {
 637               next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 638               error0 = IP6_ERROR_REASS_LIMIT_REACHED;
 639               b0->error = node->errors[error0];
 640               goto packet_enqueue;
 641             }
 642
 643           if (reass->is_complete)
 644             {
 645               vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 646                 ! !ip6_frag_hdr_offset (frag_hdr);
 647               vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 648               vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 649                 reass->icmp_type_or_tcp_flags;
 650               vnet_buffer (b0)->ip.reass.tcp_ack_number =
 651                 reass->tcp_ack_number;
 652               vnet_buffer (b0)->ip.reass.tcp_seq_number =
 653                 reass->tcp_seq_number;
 654               vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 655               vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 656               next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
 657               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 658                 {
 659                   ip6_sv_reass_add_trace (
 660                     vm, node, reass, bi0, REASS_FRAGMENT_FORWARD,
 661                     reass->ip_proto, reass->l4_src_port, reass->l4_dst_port);
 662                 }
 663               goto packet_enqueue;
 664             }
 665
 666           u32 counter = ~0;
 667           switch (ip6_sv_reass_update (vm, node, rm, reass, bi0, frag_hdr))
 668             {
 669             case IP6_SV_REASS_RC_OK:
 670               /* nothing to do here */
 671               break;
 672             case IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS:
 673               counter = IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG;
 674               break;
 675             case IP6_SV_REASS_RC_UNSUPP_IP_PROTO:
 676               counter = IP6_ERROR_REASS_UNSUPP_IP_PROTO;
 677               break;
 678             case IP6_SV_REASS_RC_INTERNAL_ERROR:
 679               counter = IP6_ERROR_REASS_INTERNAL_ERROR;
 680               break;
 681             case IP6_SV_REASS_RC_INVALID_FRAG_LEN:
 682               counter = IP6_ERROR_REASS_INVALID_FRAG_LEN;
 683               break;
 684             }
 685           if (~0 != counter)
 686             {
 687               vlib_node_increment_counter (vm, node->node_index, counter, 1);
 688               ip6_sv_reass_free (vm, rm, rt, reass);
 689               goto next_packet;
 690             }
 691
 692           if (reass->is_complete)
 693             {
 694               u32 idx;
 695               vec_foreach_index (idx, reass->cached_buffers)
 696               {
 697                 u32 bi0 = vec_elt (reass->cached_buffers, idx);
 698                 if (0 == n_left_to_next)
 699                   {
 700                     vlib_put_next_frame (vm, node, next_index,
 701                                          n_left_to_next);
 702                     vlib_get_next_frame (vm, node, next_index, to_next,
 703                                          n_left_to_next);
 704                   }
 705                 to_next[0] = bi0;
 706                 to_next += 1;
 707                 n_left_to_next -= 1;
 708                 b0 = vlib_get_buffer (vm, bi0);
 709                 if (is_feature)
 710                   {
 711                     vnet_feature_next (&next0, b0);
 712                   }
 713                 frag_hdr =
 714                   vlib_buffer_get_current (b0) +
 715                   vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset;
 716                 vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 717                   ! !ip6_frag_hdr_offset (frag_hdr);
 718                 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 719                 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 720                   reass->icmp_type_or_tcp_flags;
 721                 vnet_buffer (b0)->ip.reass.tcp_ack_number =
 722                   reass->tcp_ack_number;
 723                 vnet_buffer (b0)->ip.reass.tcp_seq_number =
 724                   reass->tcp_seq_number;
 725                 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 726                 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 727                 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 728                   {
 729                     ip6_sv_reass_add_trace (
 730                       vm, node, reass, bi0, REASS_FRAGMENT_FORWARD,
 731                       reass->ip_proto, reass->l4_src_port, 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         next_packet:
 754           from += 1;
 755           n_left_from -= 1;
 756         }
 757
 758       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 759     }
 760
 761   clib_spinlock_unlock (&rt->lock);
 762   return frame->n_vectors;
 763 }
 764
 765 static char *ip6_sv_reassembly_error_strings[] = {
 766 #define _(sym, string) string,
 767   foreach_ip6_error
 768 #undef _
 769 };
 770
 771 VLIB_NODE_FN (ip6_sv_reass_node) (vlib_main_t * vm,
 772                                   vlib_node_runtime_t * node,
 773                                   vlib_frame_t * frame)
 774 {
 775   return ip6_sv_reassembly_inline (vm, node, frame, false /* is_feature */ );
 776 }
 777
 778 /* *INDENT-OFF* */
 779 VLIB_REGISTER_NODE (ip6_sv_reass_node) = {
 780     .name = "ip6-sv-reassembly",
 781     .vector_size = sizeof (u32),
 782     .format_trace = format_ip6_sv_reass_trace,
 783     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
 784     .error_strings = ip6_sv_reassembly_error_strings,
 785     .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
 786     .next_nodes =
 787         {
 788                 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
 789                 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
 790                 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
 791                 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reassembly-handoff",
 792         },
 793 };
 794 /* *INDENT-ON* */
 795
 796 VLIB_NODE_FN (ip6_sv_reass_node_feature) (vlib_main_t * vm,
 797                                           vlib_node_runtime_t * node,
 798                                           vlib_frame_t * frame)
 799 {
 800   return ip6_sv_reassembly_inline (vm, node, frame, true /* is_feature */ );
 801 }
 802
 803 /* *INDENT-OFF* */
 804 VLIB_REGISTER_NODE (ip6_sv_reass_node_feature) = {
 805     .name = "ip6-sv-reassembly-feature",
 806     .vector_size = sizeof (u32),
 807     .format_trace = format_ip6_sv_reass_trace,
 808     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
 809     .error_strings = ip6_sv_reassembly_error_strings,
 810     .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
 811     .next_nodes =
 812         {
 813                 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
 814                 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
 815                 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
 816                 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reass-feature-hoff",
 817         },
 818 };
 819 /* *INDENT-ON* */
 820
 821 /* *INDENT-OFF* */
 822 VNET_FEATURE_INIT (ip6_sv_reassembly_feature) = {
 823     .arc_name = "ip6-unicast",
 824     .node_name = "ip6-sv-reassembly-feature",
 825     .runs_before = VNET_FEATURES ("ip6-lookup"),
 826     .runs_after = 0,
 827 };
 828 /* *INDENT-ON* */
 829
 830 #ifndef CLIB_MARCH_VARIANT
 831 static u32
 832 ip6_sv_reass_get_nbuckets ()
 833 {
 834   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 835   u32 nbuckets;
 836   u8 i;
 837
 838   nbuckets = (u32) (rm->max_reass_n / IP6_SV_REASS_HT_LOAD_FACTOR);
 839
 840   for (i = 0; i < 31; i++)
 841     if ((1 << i) >= nbuckets)
 842       break;
 843   nbuckets = 1 << i;
 844
 845   return nbuckets;
 846 }
 847 #endif /* CLIB_MARCH_VARIANT */
 848
 849 typedef enum
 850 {
 851   IP6_EVENT_CONFIG_CHANGED = 1,
 852 } ip6_sv_reass_event_t;
 853
 854 #ifndef CLIB_MARCH_VARIANT
 855 typedef struct
 856 {
 857   int failure;
 858   clib_bihash_48_8_t *new_hash;
 859 } ip6_rehash_cb_ctx;
 860
 861 static int
 862 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
 863 {
 864   ip6_rehash_cb_ctx *ctx = _ctx;
 865   if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
 866     {
 867       ctx->failure = 1;
 868     }
 869   return (BIHASH_WALK_CONTINUE);
 870 }
 871
 872 static void
 873 ip6_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
 874                          u32 max_reassembly_length,
 875                          u32 expire_walk_interval_ms)
 876 {
 877   ip6_sv_reass_main.timeout_ms = timeout_ms;
 878   ip6_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
 879   ip6_sv_reass_main.max_reass_n = max_reassemblies;
 880   ip6_sv_reass_main.max_reass_len = max_reassembly_length;
 881   ip6_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
 882 }
 883
 884 vnet_api_error_t
 885 ip6_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
 886                   u32 max_reassembly_length, u32 expire_walk_interval_ms)
 887 {
 888   u32 old_nbuckets = ip6_sv_reass_get_nbuckets ();
 889   ip6_sv_reass_set_params (timeout_ms, max_reassemblies,
 890                            max_reassembly_length, expire_walk_interval_ms);
 891   vlib_process_signal_event (ip6_sv_reass_main.vlib_main,
 892                              ip6_sv_reass_main.ip6_sv_reass_expire_node_idx,
 893                              IP6_EVENT_CONFIG_CHANGED, 0);
 894   u32 new_nbuckets = ip6_sv_reass_get_nbuckets ();
 895   if (ip6_sv_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
 896     {
 897       clib_bihash_48_8_t new_hash;
 898       clib_memset (&new_hash, 0, sizeof (new_hash));
 899       ip6_rehash_cb_ctx ctx;
 900       ctx.failure = 0;
 901       ctx.new_hash = &new_hash;
 902       clib_bihash_init_48_8 (&new_hash, "ip6-sv-reass", new_nbuckets,
 903                              new_nbuckets * 1024);
 904       clib_bihash_foreach_key_value_pair_48_8 (&ip6_sv_reass_main.hash,
 905                                                ip6_rehash_cb, &ctx);
 906       if (ctx.failure)
 907         {
 908           clib_bihash_free_48_8 (&new_hash);
 909           return -1;
 910         }
 911       else
 912         {
 913           clib_bihash_free_48_8 (&ip6_sv_reass_main.hash);
 914           clib_memcpy_fast (&ip6_sv_reass_main.hash, &new_hash,
 915                             sizeof (ip6_sv_reass_main.hash));
 916           clib_bihash_copied (&ip6_sv_reass_main.hash, &new_hash);
 917         }
 918     }
 919   return 0;
 920 }
 921
 922 vnet_api_error_t
 923 ip6_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
 924                   u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
 925 {
 926   *timeout_ms = ip6_sv_reass_main.timeout_ms;
 927   *max_reassemblies = ip6_sv_reass_main.max_reass_n;
 928   *max_reassembly_length = ip6_sv_reass_main.max_reass_len;
 929   *expire_walk_interval_ms = ip6_sv_reass_main.expire_walk_interval_ms;
 930   return 0;
 931 }
 932
 933 static clib_error_t *
 934 ip6_sv_reass_init_function (vlib_main_t * vm)
 935 {
 936   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 937   clib_error_t *error = 0;
 938   u32 nbuckets;
 939   vlib_node_t *node;
 940
 941   rm->vlib_main = vm;
 942   rm->vnet_main = vnet_get_main ();
 943
 944   vec_validate (rm->per_thread_data, vlib_num_workers ());
 945   ip6_sv_reass_per_thread_t *rt;
 946   vec_foreach (rt, rm->per_thread_data)
 947   {
 948     clib_spinlock_init (&rt->lock);
 949     pool_alloc (rt->pool, rm->max_reass_n);
 950     rt->lru_first = rt->lru_last = ~0;
 951   }
 952
 953   node = vlib_get_node_by_name (vm, (u8 *) "ip6-sv-reassembly-expire-walk");
 954   ASSERT (node);
 955   rm->ip6_sv_reass_expire_node_idx = node->index;
 956
 957   ip6_sv_reass_set_params (IP6_SV_REASS_TIMEOUT_DEFAULT_MS,
 958                            IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
 959                            IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
 960                            IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
 961
 962   nbuckets = ip6_sv_reass_get_nbuckets ();
 963   clib_bihash_init_48_8 (&rm->hash, "ip6-sv-reass", nbuckets,
 964                          nbuckets * 1024);
 965
 966   node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
 967   ASSERT (node);
 968   rm->ip6_drop_idx = node->index;
 969   node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
 970   ASSERT (node);
 971   rm->ip6_icmp_error_idx = node->index;
 972
 973   if ((error = vlib_call_init_function (vm, ip_main_init)))
 974     return error;
 975
 976   rm->fq_index = vlib_frame_queue_main_init (ip6_sv_reass_node.index, 0);
 977   rm->fq_feature_index =
 978     vlib_frame_queue_main_init (ip6_sv_reass_node_feature.index, 0);
 979
 980   rm->feature_use_refcount_per_intf = NULL;
 981
 982   return error;
 983 }
 984
 985 VLIB_INIT_FUNCTION (ip6_sv_reass_init_function);
 986 #endif /* CLIB_MARCH_VARIANT */
 987
 988 static uword
 989 ip6_sv_reass_walk_expired (vlib_main_t *vm,
 990                            CLIB_UNUSED (vlib_node_runtime_t *node),
 991                            CLIB_UNUSED (vlib_frame_t *f))
 992 {
 993   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 994   uword event_type, *event_data = 0;
 995
 996   while (true)
 997     {
 998       vlib_process_wait_for_event_or_clock (vm,
 999                                             (f64) rm->expire_walk_interval_ms
1000                                             / (f64) MSEC_PER_SEC);
1001       event_type = vlib_process_get_events (vm, &event_data);
1002
1003       switch (event_type)
1004         {
1005         case ~0:
1006           /* no events => timeout */
1007           /* fallthrough */
1008         case IP6_EVENT_CONFIG_CHANGED:
1009           /* nothing to do here */
1010           break;
1011         default:
1012           clib_warning ("BUG: event type 0x%wx", event_type);
1013           break;
1014         }
1015       f64 now = vlib_time_now (vm);
1016
1017       ip6_sv_reass_t *reass;
1018       int *pool_indexes_to_free = NULL;
1019
1020       uword thread_index = 0;
1021       int index;
1022       const uword nthreads = vlib_num_workers () + 1;
1023       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1024         {
1025           ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1026           clib_spinlock_lock (&rt->lock);
1027
1028           vec_reset_length (pool_indexes_to_free);
1029           /* *INDENT-OFF* */
1030           pool_foreach_index (index, rt->pool)  {
1031                                 reass = pool_elt_at_index (rt->pool, index);
1032                                 if (now > reass->last_heard + rm->timeout)
1033                                   {
1034                                     vec_add1 (pool_indexes_to_free, index);
1035                                   }
1036                               }
1037           /* *INDENT-ON* */
1038           int *i;
1039           /* *INDENT-OFF* */
1040           vec_foreach (i, pool_indexes_to_free)
1041           {
1042             ip6_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1043             ip6_sv_reass_free (vm, rm, rt, reass);
1044           }
1045           /* *INDENT-ON* */
1046
1047           clib_spinlock_unlock (&rt->lock);
1048         }
1049
1050       vec_free (pool_indexes_to_free);
1051       if (event_data)
1052         {
1053           _vec_len (event_data) = 0;
1054         }
1055     }
1056
1057   return 0;
1058 }
1059
1060 /* *INDENT-OFF* */
1061 VLIB_REGISTER_NODE (ip6_sv_reass_expire_node) = {
1062     .function = ip6_sv_reass_walk_expired,
1063     .format_trace = format_ip6_sv_reass_trace,
1064     .type = VLIB_NODE_TYPE_PROCESS,
1065     .name = "ip6-sv-reassembly-expire-walk",
1066
1067     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
1068     .error_strings = ip6_sv_reassembly_error_strings,
1069
1070 };
1071 /* *INDENT-ON* */
1072
1073 static u8 *
1074 format_ip6_sv_reass_key (u8 * s, va_list * args)
1075 {
1076   ip6_sv_reass_key_t *key = va_arg (*args, ip6_sv_reass_key_t *);
1077   s =
1078     format (s, "fib_index: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1079             key->fib_index, format_ip6_address, &key->src, format_ip6_address,
1080             &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1081   return s;
1082 }
1083
1084 static u8 *
1085 format_ip6_sv_reass (u8 * s, va_list * args)
1086 {
1087   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1088   ip6_sv_reass_t *reass = va_arg (*args, ip6_sv_reass_t *);
1089
1090   s = format (s, "ID: %lu, key: %U, trace_op_counter: %u\n",
1091               reass->id, format_ip6_sv_reass_key, &reass->key,
1092               reass->trace_op_counter);
1093   vlib_buffer_t *b;
1094   u32 *bip;
1095   u32 counter = 0;
1096   vec_foreach (bip, reass->cached_buffers)
1097   {
1098     u32 bi = *bip;
1099     do
1100       {
1101         b = vlib_get_buffer (vm, bi);
1102         s = format (s, "  #%03u: bi: %u\n", counter, bi);
1103         ++counter;
1104         bi = b->next_buffer;
1105       }
1106     while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1107   }
1108   return s;
1109 }
1110
1111 static clib_error_t *
1112 show_ip6_sv_reass (vlib_main_t * vm, unformat_input_t * input,
1113                    CLIB_UNUSED (vlib_cli_command_t * lmd))
1114 {
1115   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1116
1117   vlib_cli_output (vm, "---------------------");
1118   vlib_cli_output (vm, "IP6 reassembly status");
1119   vlib_cli_output (vm, "---------------------");
1120   bool details = false;
1121   if (unformat (input, "details"))
1122     {
1123       details = true;
1124     }
1125
1126   u32 sum_reass_n = 0;
1127   u64 sum_buffers_n = 0;
1128   ip6_sv_reass_t *reass;
1129   uword thread_index;
1130   const uword nthreads = vlib_num_workers () + 1;
1131   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1132     {
1133       ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1134       clib_spinlock_lock (&rt->lock);
1135       if (details)
1136         {
1137           /* *INDENT-OFF* */
1138           pool_foreach (reass, rt->pool) {
1139             vlib_cli_output (vm, "%U", format_ip6_sv_reass, vm, reass);
1140           }
1141           /* *INDENT-ON* */
1142         }
1143       sum_reass_n += rt->reass_n;
1144       clib_spinlock_unlock (&rt->lock);
1145     }
1146   vlib_cli_output (vm, "---------------------");
1147   vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1148                    (long unsigned) sum_reass_n);
1149   vlib_cli_output (vm,
1150                    "Maximum configured concurrent shallow virtual IP6 reassemblies per worker-thread: %lu\n",
1151                    (long unsigned) rm->max_reass_n);
1152   vlib_cli_output (vm,
1153                    "Maximum configured amount of fragments per shallow "
1154                    "virtual IP6 reassembly: %lu\n",
1155                    (long unsigned) rm->max_reass_len);
1156   vlib_cli_output (vm,
1157                    "Maximum configured shallow virtual IP6 reassembly timeout: %lums\n",
1158                    (long unsigned) rm->timeout_ms);
1159   vlib_cli_output (vm,
1160                    "Maximum configured shallow virtual IP6 reassembly expire walk interval: %lums\n",
1161                    (long unsigned) rm->expire_walk_interval_ms);
1162   vlib_cli_output (vm, "Buffers in use: %lu\n",
1163                    (long unsigned) sum_buffers_n);
1164   return 0;
1165 }
1166
1167 /* *INDENT-OFF* */
1168 VLIB_CLI_COMMAND (show_ip6_sv_reassembly_cmd, static) = {
1169     .path = "show ip6-sv-reassembly",
1170     .short_help = "show ip6-sv-reassembly [details]",
1171     .function = show_ip6_sv_reass,
1172 };
1173 /* *INDENT-ON* */
1174
1175 #ifndef CLIB_MARCH_VARIANT
1176 vnet_api_error_t
1177 ip6_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1178 {
1179   return ip6_sv_reass_enable_disable_with_refcnt (sw_if_index,
1180                                                   enable_disable);
1181 }
1182 #endif /* CLIB_MARCH_VARIANT */
1183
1184 #define foreach_ip6_sv_reassembly_handoff_error                       \
1185 _(CONGESTION_DROP, "congestion drop")
1186
1187
1188 typedef enum
1189 {
1190 #define _(sym,str) IP6_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
1191   foreach_ip6_sv_reassembly_handoff_error
1192 #undef _
1193     IP6_SV_REASSEMBLY_HANDOFF_N_ERROR,
1194 } ip6_sv_reassembly_handoff_error_t;
1195
1196 static char *ip6_sv_reassembly_handoff_error_strings[] = {
1197 #define _(sym,string) string,
1198   foreach_ip6_sv_reassembly_handoff_error
1199 #undef _
1200 };
1201
1202 typedef struct
1203 {
1204   u32 next_worker_index;
1205 } ip6_sv_reassembly_handoff_trace_t;
1206
1207 static u8 *
1208 format_ip6_sv_reassembly_handoff_trace (u8 * s, va_list * args)
1209 {
1210   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1211   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1212   ip6_sv_reassembly_handoff_trace_t *t =
1213     va_arg (*args, ip6_sv_reassembly_handoff_trace_t *);
1214
1215   s =
1216     format (s, "ip6-sv-reassembly-handoff: next-worker %d",
1217             t->next_worker_index);
1218
1219   return s;
1220 }
1221
1222 always_inline uword
1223 ip6_sv_reassembly_handoff_inline (vlib_main_t * vm,
1224                                   vlib_node_runtime_t * node,
1225                                   vlib_frame_t * frame, bool is_feature)
1226 {
1227   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1228
1229   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1230   u32 n_enq, n_left_from, *from;
1231   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1232   u32 fq_index;
1233
1234   from = vlib_frame_vector_args (frame);
1235   n_left_from = frame->n_vectors;
1236   vlib_get_buffers (vm, from, bufs, n_left_from);
1237
1238   b = bufs;
1239   ti = thread_indices;
1240
1241   fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1242
1243   while (n_left_from > 0)
1244     {
1245       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1246
1247       if (PREDICT_FALSE
1248           ((node->flags & VLIB_NODE_FLAG_TRACE)
1249            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1250         {
1251           ip6_sv_reassembly_handoff_trace_t *t =
1252             vlib_add_trace (vm, node, b[0], sizeof (*t));
1253           t->next_worker_index = ti[0];
1254         }
1255
1256       n_left_from -= 1;
1257       ti += 1;
1258       b += 1;
1259     }
1260   n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from,
1261                                          thread_indices, frame->n_vectors, 1);
1262
1263   if (n_enq < frame->n_vectors)
1264     vlib_node_increment_counter (vm, node->node_index,
1265                                  IP6_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1266                                  frame->n_vectors - n_enq);
1267   return frame->n_vectors;
1268 }
1269
1270 VLIB_NODE_FN (ip6_sv_reassembly_handoff_node) (vlib_main_t * vm,
1271                                                vlib_node_runtime_t * node,
1272                                                vlib_frame_t * frame)
1273 {
1274   return ip6_sv_reassembly_handoff_inline (vm, node, frame,
1275                                            false /* is_feature */ );
1276 }
1277
1278 /* *INDENT-OFF* */
1279 VLIB_REGISTER_NODE (ip6_sv_reassembly_handoff_node) = {
1280   .name = "ip6-sv-reassembly-handoff",
1281   .vector_size = sizeof (u32),
1282   .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1283   .error_strings = ip6_sv_reassembly_handoff_error_strings,
1284   .format_trace = format_ip6_sv_reassembly_handoff_trace,
1285
1286   .n_next_nodes = 1,
1287
1288   .next_nodes = {
1289     [0] = "error-drop",
1290   },
1291 };
1292
1293
1294 VLIB_NODE_FN (ip6_sv_reassembly_feature_handoff_node) (vlib_main_t * vm,
1295                                vlib_node_runtime_t * node, vlib_frame_t * frame)
1296 {
1297   return ip6_sv_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1298 }
1299
1300
1301 /* *INDENT-OFF* */
1302 VLIB_REGISTER_NODE (ip6_sv_reassembly_feature_handoff_node) = {
1303   .name = "ip6-sv-reass-feature-hoff",
1304   .vector_size = sizeof (u32),
1305   .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1306   .error_strings = ip6_sv_reassembly_handoff_error_strings,
1307   .format_trace = format_ip6_sv_reassembly_handoff_trace,
1308
1309   .n_next_nodes = 1,
1310
1311   .next_nodes = {
1312     [0] = "error-drop",
1313   },
1314 };
1315 /* *INDENT-ON* */
1316
1317 #ifndef CLIB_MARCH_VARIANT
1318 int
1319 ip6_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1320 {
1321   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1322   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1323   if (is_enable)
1324     {
1325       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1326         {
1327           ++rm->feature_use_refcount_per_intf[sw_if_index];
1328           return vnet_feature_enable_disable ("ip6-unicast",
1329                                               "ip6-sv-reassembly-feature",
1330                                               sw_if_index, 1, 0, 0);
1331         }
1332       ++rm->feature_use_refcount_per_intf[sw_if_index];
1333     }
1334   else
1335     {
1336       --rm->feature_use_refcount_per_intf[sw_if_index];
1337       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1338         return vnet_feature_enable_disable ("ip6-unicast",
1339                                             "ip6-sv-reassembly-feature",
1340                                             sw_if_index, 0, 0, 0);
1341     }
1342   return 0;
1343 }
1344 #endif
1345
1346 /*
1347  * fd.io coding-style-patch-verification: ON
1348  *
1349  * Local Variables:
1350  * eval: (c-set-style "gnu")
1351  * End:
1352  */