src/vnet/ip/reass/ip6_full_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 Full Reassembly.
  19  *
  20  * This file contains the source code for IPv6 full reassembly.
  21  */
  22
  23 #include <vppinfra/vec.h>
  24 #include <vnet/vnet.h>
  25 #include <vnet/ip/ip.h>
  26 #include <vppinfra/bihash_48_8.h>
  27 #include <vnet/ip/reass/ip6_full_reass.h>
  28
  29 #define MSEC_PER_SEC 1000
  30 #define IP6_FULL_REASS_TIMEOUT_DEFAULT_MS 100
  31 #define IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000    // 10 seconds default
  32 #define IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT 1024
  33 #define IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
  34 #define IP6_FULL_REASS_HT_LOAD_FACTOR (0.75)
  35
  36 typedef enum
  37 {
  38   IP6_FULL_REASS_RC_OK,
  39   IP6_FULL_REASS_RC_INTERNAL_ERROR,
  40   IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS,
  41   IP6_FULL_REASS_RC_NO_BUF,
  42   IP6_FULL_REASS_RC_HANDOFF,
  43 } ip6_full_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_full_reass_key_t;
  61
  62 typedef union
  63 {
  64   struct
  65   {
  66     u32 reass_index;
  67     u32 memory_owner_thread_index;
  68   };
  69   u64 as_u64;
  70 } ip6_full_reass_val_t;
  71
  72 typedef union
  73 {
  74   struct
  75   {
  76     ip6_full_reass_key_t k;
  77     ip6_full_reass_val_t v;
  78   };
  79   clib_bihash_kv_48_8_t kv;
  80 } ip6_full_reass_kv_t;
  81
  82
  83 always_inline u32
  84 ip6_full_reass_buffer_get_data_offset (vlib_buffer_t * b)
  85 {
  86   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
  87   return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first;
  88 }
  89
  90 always_inline u16
  91 ip6_full_reass_buffer_get_data_len (vlib_buffer_t * b)
  92 {
  93   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
  94   return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) -
  95     (vnb->ip.reass.fragment_first +
  96      ip6_full_reass_buffer_get_data_offset (b)) + 1;
  97 }
  98
  99 typedef struct
 100 {
 101   // hash table key
 102   ip6_full_reass_key_t key;
 103   // time when last packet was received
 104   f64 last_heard;
 105   // internal id of this reassembly
 106   u64 id;
 107   // buffer index of first buffer in this reassembly context
 108   u32 first_bi;
 109   // last octet of packet, ~0 until fragment without more_fragments arrives
 110   u32 last_packet_octet;
 111   // length of data collected so far
 112   u32 data_len;
 113   // trace operation counter
 114   u32 trace_op_counter;
 115   // next index - used by custom apps (~0 if not set)
 116   u32 next_index;
 117   // error next index - used by custom apps (~0 if not set)
 118   u32 error_next_index;
 119   // minimum fragment length for this reassembly - used to estimate MTU
 120   u16 min_fragment_length;
 121   // number of fragments for this reassembly
 122   u32 fragments_n;
 123   // thread owning memory for this context (whose pool contains this ctx)
 124   u32 memory_owner_thread_index;
 125   // thread which received fragment with offset 0 and which sends out the
 126   // completed reassembly
 127   u32 sendout_thread_index;
 128 } ip6_full_reass_t;
 129
 130 typedef struct
 131 {
 132   ip6_full_reass_t *pool;
 133   u32 reass_n;
 134   u32 id_counter;
 135   clib_spinlock_t lock;
 136 } ip6_full_reass_per_thread_t;
 137
 138 typedef struct
 139 {
 140   // IPv6 config
 141   u32 timeout_ms;
 142   f64 timeout;
 143   u32 expire_walk_interval_ms;
 144   // maximum number of fragments in one reassembly
 145   u32 max_reass_len;
 146   // maximum number of reassemblies
 147   u32 max_reass_n;
 148
 149   // IPv6 runtime
 150   clib_bihash_48_8_t hash;
 151
 152   // per-thread data
 153   ip6_full_reass_per_thread_t *per_thread_data;
 154
 155   // convenience
 156   vlib_main_t *vlib_main;
 157
 158   // node index of ip6-drop node
 159   u32 ip6_drop_idx;
 160   u32 ip6_icmp_error_idx;
 161   u32 ip6_full_reass_expire_node_idx;
 162
 163   /** Worker handoff */
 164   u32 fq_index;
 165   u32 fq_feature_index;
 166
 167   // reference count for enabling/disabling feature - per interface
 168   u32 *feature_use_refcount_per_intf;
 169 } ip6_full_reass_main_t;
 170
 171 extern ip6_full_reass_main_t ip6_full_reass_main;
 172
 173 #ifndef CLIB_MARCH_VARIANT
 174 ip6_full_reass_main_t ip6_full_reass_main;
 175 #endif /* CLIB_MARCH_VARIANT */
 176
 177 typedef enum
 178 {
 179   IP6_FULL_REASSEMBLY_NEXT_INPUT,
 180   IP6_FULL_REASSEMBLY_NEXT_DROP,
 181   IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR,
 182   IP6_FULL_REASSEMBLY_NEXT_HANDOFF,
 183   IP6_FULL_REASSEMBLY_N_NEXT,
 184 } ip6_full_reass_next_t;
 185
 186 typedef enum
 187 {
 188   RANGE_NEW,
 189   RANGE_OVERLAP,
 190   ICMP_ERROR_RT_EXCEEDED,
 191   ICMP_ERROR_FL_TOO_BIG,
 192   ICMP_ERROR_FL_NOT_MULT_8,
 193   FINALIZE,
 194   HANDOFF,
 195 } ip6_full_reass_trace_operation_e;
 196
 197 typedef struct
 198 {
 199   u16 range_first;
 200   u16 range_last;
 201   u32 range_bi;
 202   i32 data_offset;
 203   u32 data_len;
 204   u32 first_bi;
 205 } ip6_full_reass_range_trace_t;
 206
 207 typedef struct
 208 {
 209   ip6_full_reass_trace_operation_e action;
 210   u32 reass_id;
 211   ip6_full_reass_range_trace_t trace_range;
 212   u32 op_id;
 213   u32 fragment_first;
 214   u32 fragment_last;
 215   u32 total_data_len;
 216   u32 thread_id;
 217   u32 thread_id_to;
 218   bool is_after_handoff;
 219   ip6_header_t ip6_header;
 220   ip6_frag_hdr_t ip6_frag_header;
 221 } ip6_full_reass_trace_t;
 222
 223 static void
 224 ip6_full_reass_trace_details (vlib_main_t * vm, u32 bi,
 225                               ip6_full_reass_range_trace_t * trace)
 226 {
 227   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 228   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 229   trace->range_first = vnb->ip.reass.range_first;
 230   trace->range_last = vnb->ip.reass.range_last;
 231   trace->data_offset = ip6_full_reass_buffer_get_data_offset (b);
 232   trace->data_len = ip6_full_reass_buffer_get_data_len (b);
 233   trace->range_bi = bi;
 234 }
 235
 236 static u8 *
 237 format_ip6_full_reass_range_trace (u8 * s, va_list * args)
 238 {
 239   ip6_full_reass_range_trace_t *trace =
 240     va_arg (*args, ip6_full_reass_range_trace_t *);
 241   s =
 242     format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
 243             trace->range_last, trace->data_offset, trace->data_len,
 244             trace->range_bi);
 245   return s;
 246 }
 247
 248 static u8 *
 249 format_ip6_full_reass_trace (u8 * s, va_list * args)
 250 {
 251   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 252   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 253   ip6_full_reass_trace_t *t = va_arg (*args, ip6_full_reass_trace_t *);
 254   u32 indent = 0;
 255   if (~0 != t->reass_id)
 256     {
 257       if (t->is_after_handoff)
 258         {
 259           s =
 260             format (s, "%U\n", format_ip6_header, &t->ip6_header,
 261                     sizeof (t->ip6_header));
 262           s =
 263             format (s, "  %U\n", format_ip6_frag_hdr, &t->ip6_frag_header,
 264                     sizeof (t->ip6_frag_header));
 265           indent = 2;
 266         }
 267       s =
 268         format (s, "%Ureass id: %u, op id: %u, ", format_white_space, indent,
 269                 t->reass_id, t->op_id);
 270       indent = format_get_indent (s);
 271       s = format (s, "first bi: %u, data len: %u, ip/fragment[%u, %u]",
 272                   t->trace_range.first_bi, t->total_data_len,
 273                   t->fragment_first, t->fragment_last);
 274     }
 275   switch (t->action)
 276     {
 277     case RANGE_NEW:
 278       s = format (s, "\n%Unew %U", format_white_space, indent,
 279                   format_ip6_full_reass_range_trace, &t->trace_range);
 280       break;
 281     case RANGE_OVERLAP:
 282       s = format (s, "\n%Uoverlap %U", format_white_space, indent,
 283                   format_ip6_full_reass_range_trace, &t->trace_range);
 284       break;
 285     case ICMP_ERROR_FL_TOO_BIG:
 286       s = format (s, "\n%Uicmp-error - frag_len > 65535 %U",
 287                   format_white_space, indent,
 288                   format_ip6_full_reass_range_trace, &t->trace_range);
 289       break;
 290     case ICMP_ERROR_FL_NOT_MULT_8:
 291       s = format (s, "\n%Uicmp-error - frag_len mod 8 != 0 %U",
 292                   format_white_space, indent,
 293                   format_ip6_full_reass_range_trace, &t->trace_range);
 294       break;
 295     case ICMP_ERROR_RT_EXCEEDED:
 296       s = format (s, "\n%Uicmp-error - reassembly time exceeded",
 297                   format_white_space, indent);
 298       break;
 299     case FINALIZE:
 300       s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
 301       break;
 302     case HANDOFF:
 303       s =
 304         format (s, "handoff from thread #%u to thread #%u", t->thread_id,
 305                 t->thread_id_to);
 306       break;
 307     }
 308   return s;
 309 }
 310
 311 static void
 312 ip6_full_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 313                           ip6_full_reass_main_t * rm,
 314                           ip6_full_reass_t * reass, u32 bi,
 315                           ip6_frag_hdr_t * ip6_frag_header,
 316                           ip6_full_reass_trace_operation_e action,
 317                           u32 thread_id_to)
 318 {
 319   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 320   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 321   bool is_after_handoff = false;
 322   if (vlib_buffer_get_trace_thread (b) != vm->thread_index)
 323     {
 324       is_after_handoff = true;
 325     }
 326   ip6_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 327   t->is_after_handoff = is_after_handoff;
 328   if (t->is_after_handoff)
 329     {
 330       clib_memcpy (&t->ip6_header, vlib_buffer_get_current (b),
 331                    clib_min (sizeof (t->ip6_header), b->current_length));
 332       if (ip6_frag_header)
 333         {
 334           clib_memcpy (&t->ip6_frag_header, ip6_frag_header,
 335                        sizeof (t->ip6_frag_header));
 336         }
 337       else
 338         {
 339           clib_memset (&t->ip6_frag_header, 0, sizeof (t->ip6_frag_header));
 340         }
 341     }
 342   if (reass)
 343     {
 344       t->reass_id = reass->id;
 345       t->op_id = reass->trace_op_counter;
 346       t->trace_range.first_bi = reass->first_bi;
 347       t->total_data_len = reass->data_len;
 348       ++reass->trace_op_counter;
 349     }
 350   else
 351     {
 352       t->reass_id = ~0;
 353     }
 354   t->action = action;
 355   t->thread_id = vm->thread_index;
 356   t->thread_id_to = thread_id_to;
 357   ip6_full_reass_trace_details (vm, bi, &t->trace_range);
 358   t->fragment_first = vnb->ip.reass.fragment_first;
 359   t->fragment_last = vnb->ip.reass.fragment_last;
 360 #if 0
 361   static u8 *s = NULL;
 362   s = format (s, "%U", format_ip6_full_reass_trace, NULL, NULL, t);
 363   printf ("%.*s\n", vec_len (s), s);
 364   fflush (stdout);
 365   vec_reset_length (s);
 366 #endif
 367 }
 368
 369 always_inline void
 370 ip6_full_reass_free_ctx (ip6_full_reass_per_thread_t * rt,
 371                          ip6_full_reass_t * reass)
 372 {
 373   pool_put (rt->pool, reass);
 374   --rt->reass_n;
 375 }
 376
 377 always_inline void
 378 ip6_full_reass_free (ip6_full_reass_main_t * rm,
 379                      ip6_full_reass_per_thread_t * rt,
 380                      ip6_full_reass_t * reass)
 381 {
 382   clib_bihash_kv_48_8_t kv;
 383   kv.key[0] = reass->key.as_u64[0];
 384   kv.key[1] = reass->key.as_u64[1];
 385   kv.key[2] = reass->key.as_u64[2];
 386   kv.key[3] = reass->key.as_u64[3];
 387   kv.key[4] = reass->key.as_u64[4];
 388   kv.key[5] = reass->key.as_u64[5];
 389   clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
 390   ip6_full_reass_free_ctx (rt, reass);
 391 }
 392
 393 always_inline void
 394 ip6_full_reass_drop_all (vlib_main_t * vm, vlib_node_runtime_t * node,
 395                          ip6_full_reass_main_t * rm, ip6_full_reass_t * reass)
 396 {
 397   u32 range_bi = reass->first_bi;
 398   vlib_buffer_t *range_b;
 399   vnet_buffer_opaque_t *range_vnb;
 400   u32 *to_free = NULL;
 401   while (~0 != range_bi)
 402     {
 403       range_b = vlib_get_buffer (vm, range_bi);
 404       range_vnb = vnet_buffer (range_b);
 405       u32 bi = range_bi;
 406       while (~0 != bi)
 407         {
 408           vec_add1 (to_free, bi);
 409           vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 410           if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 411             {
 412               bi = b->next_buffer;
 413               b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 414             }
 415           else
 416             {
 417               bi = ~0;
 418             }
 419         }
 420       range_bi = range_vnb->ip.reass.next_range_bi;
 421     }
 422   /* send to next_error_index */
 423   if (~0 != reass->error_next_index)
 424     {
 425       u32 n_left_to_next, *to_next, next_index;
 426
 427       next_index = reass->error_next_index;
 428       u32 bi = ~0;
 429
 430       while (vec_len (to_free) > 0)
 431         {
 432           vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 433
 434           while (vec_len (to_free) > 0 && n_left_to_next > 0)
 435             {
 436               bi = vec_pop (to_free);
 437
 438               if (~0 != bi)
 439                 {
 440                   to_next[0] = bi;
 441                   to_next += 1;
 442                   n_left_to_next -= 1;
 443                 }
 444             }
 445           vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 446         }
 447     }
 448   else
 449     {
 450       vlib_buffer_free (vm, to_free, vec_len (to_free));
 451     }
 452   vec_free (to_free);
 453 }
 454
 455 always_inline void
 456 ip6_full_reass_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * node,
 457                            ip6_full_reass_main_t * rm,
 458                            ip6_full_reass_t * reass, u32 * icmp_bi)
 459 {
 460   if (~0 == reass->first_bi)
 461     {
 462       return;
 463     }
 464   if (~0 == reass->next_index)  // custom apps don't want icmp
 465     {
 466       vlib_buffer_t *b = vlib_get_buffer (vm, reass->first_bi);
 467       if (0 == vnet_buffer (b)->ip.reass.fragment_first)
 468         {
 469           *icmp_bi = reass->first_bi;
 470           if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
 471             {
 472               ip6_full_reass_add_trace (vm, node, rm, reass, reass->first_bi,
 473                                         NULL, ICMP_ERROR_RT_EXCEEDED, ~0);
 474             }
 475           // fragment with offset zero received - send icmp message back
 476           if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 477             {
 478               // separate first buffer from chain and steer it towards icmp node
 479               b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 480               reass->first_bi = b->next_buffer;
 481             }
 482           else
 483             {
 484               reass->first_bi = vnet_buffer (b)->ip.reass.next_range_bi;
 485             }
 486           icmp6_error_set_vnet_buffer (b, ICMP6_time_exceeded,
 487                                        ICMP6_time_exceeded_fragment_reassembly_time_exceeded,
 488                                        0);
 489         }
 490     }
 491   ip6_full_reass_drop_all (vm, node, rm, reass);
 492 }
 493
 494 always_inline ip6_full_reass_t *
 495 ip6_full_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
 496                                ip6_full_reass_main_t * rm,
 497                                ip6_full_reass_per_thread_t * rt,
 498                                ip6_full_reass_kv_t * kv, u32 * icmp_bi,
 499                                u8 * do_handoff)
 500 {
 501   ip6_full_reass_t *reass;
 502   f64 now;
 503
 504 again:
 505
 506   reass = NULL;
 507   now = vlib_time_now (vm);
 508
 509   if (!clib_bihash_search_48_8 (&rm->hash, &kv->kv, &kv->kv))
 510     {
 511       reass =
 512         pool_elt_at_index (rm->per_thread_data
 513                            [kv->v.memory_owner_thread_index].pool,
 514                            kv->v.reass_index);
 515       if (vm->thread_index != kv->v.memory_owner_thread_index)
 516         {
 517           *do_handoff = 1;
 518           return reass;
 519         }
 520
 521       if (now > reass->last_heard + rm->timeout)
 522         {
 523           ip6_full_reass_on_timeout (vm, node, rm, reass, icmp_bi);
 524           ip6_full_reass_free (rm, rt, reass);
 525           reass = NULL;
 526         }
 527     }
 528
 529   if (reass)
 530     {
 531       reass->last_heard = now;
 532       return reass;
 533     }
 534
 535   if (rt->reass_n >= rm->max_reass_n)
 536     {
 537       reass = NULL;
 538       return reass;
 539     }
 540   else
 541     {
 542       pool_get (rt->pool, reass);
 543       clib_memset (reass, 0, sizeof (*reass));
 544       reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 545       ++rt->id_counter;
 546       reass->first_bi = ~0;
 547       reass->last_packet_octet = ~0;
 548       reass->data_len = 0;
 549       reass->next_index = ~0;
 550       reass->error_next_index = ~0;
 551       ++rt->reass_n;
 552     }
 553
 554   reass->key.as_u64[0] = kv->kv.key[0];
 555   reass->key.as_u64[1] = kv->kv.key[1];
 556   reass->key.as_u64[2] = kv->kv.key[2];
 557   reass->key.as_u64[3] = kv->kv.key[3];
 558   reass->key.as_u64[4] = kv->kv.key[4];
 559   reass->key.as_u64[5] = kv->kv.key[5];
 560   kv->v.reass_index = (reass - rt->pool);
 561   kv->v.memory_owner_thread_index = vm->thread_index;
 562   reass->last_heard = now;
 563
 564   int rv = clib_bihash_add_del_48_8 (&rm->hash, &kv->kv, 2);
 565   if (rv)
 566     {
 567       ip6_full_reass_free (rm, rt, reass);
 568       reass = NULL;
 569       // if other worker created a context already work with the other copy
 570       if (-2 == rv)
 571         goto again;
 572     }
 573
 574   return reass;
 575 }
 576
 577 always_inline ip6_full_reass_rc_t
 578 ip6_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
 579                          ip6_full_reass_main_t * rm,
 580                          ip6_full_reass_per_thread_t * rt,
 581                          ip6_full_reass_t * reass, u32 * bi0, u32 * next0,
 582                          u32 * error0, bool is_custom_app)
 583 {
 584   *bi0 = reass->first_bi;
 585   *error0 = IP6_ERROR_NONE;
 586   ip6_frag_hdr_t *frag_hdr;
 587   vlib_buffer_t *last_b = NULL;
 588   u32 sub_chain_bi = reass->first_bi;
 589   u32 total_length = 0;
 590   u32 buf_cnt = 0;
 591   u32 dropped_cnt = 0;
 592   u32 *vec_drop_compress = NULL;
 593   ip6_full_reass_rc_t rv = IP6_FULL_REASS_RC_OK;
 594   do
 595     {
 596       u32 tmp_bi = sub_chain_bi;
 597       vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
 598       vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
 599       if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 600           !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 601         {
 602           rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 603           goto free_buffers_and_return;
 604         }
 605
 606       u32 data_len = ip6_full_reass_buffer_get_data_len (tmp);
 607       u32 trim_front = vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
 608         sizeof (*frag_hdr) + ip6_full_reass_buffer_get_data_offset (tmp);
 609       u32 trim_end =
 610         vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
 611       if (tmp_bi == reass->first_bi)
 612         {
 613           /* first buffer - keep ip6 header */
 614           if (0 != ip6_full_reass_buffer_get_data_offset (tmp))
 615             {
 616               rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 617               goto free_buffers_and_return;
 618             }
 619           trim_front = 0;
 620           trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
 621             (vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
 622              sizeof (*frag_hdr));
 623           if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
 624             {
 625               rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 626               goto free_buffers_and_return;
 627             }
 628         }
 629       u32 keep_data =
 630         vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
 631       while (1)
 632         {
 633           ++buf_cnt;
 634           if (trim_front)
 635             {
 636               if (trim_front > tmp->current_length)
 637                 {
 638                   /* drop whole buffer */
 639                   vec_add1 (vec_drop_compress, tmp_bi);
 640                   trim_front -= tmp->current_length;
 641                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 642                     {
 643                       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 644                       goto free_buffers_and_return;
 645                     }
 646                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 647                   tmp_bi = tmp->next_buffer;
 648                   tmp = vlib_get_buffer (vm, tmp_bi);
 649                   continue;
 650                 }
 651               else
 652                 {
 653                   vlib_buffer_advance (tmp, trim_front);
 654                   trim_front = 0;
 655                 }
 656             }
 657           if (keep_data)
 658             {
 659               if (last_b)
 660                 {
 661                   last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
 662                   last_b->next_buffer = tmp_bi;
 663                 }
 664               last_b = tmp;
 665               if (keep_data <= tmp->current_length)
 666                 {
 667                   tmp->current_length = keep_data;
 668                   keep_data = 0;
 669                 }
 670               else
 671                 {
 672                   keep_data -= tmp->current_length;
 673                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 674                     {
 675                       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 676                       goto free_buffers_and_return;
 677                     }
 678                 }
 679               total_length += tmp->current_length;
 680             }
 681           else
 682             {
 683               vec_add1 (vec_drop_compress, tmp_bi);
 684               if (reass->first_bi == tmp_bi)
 685                 {
 686                   rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 687                   goto free_buffers_and_return;
 688                 }
 689               ++dropped_cnt;
 690             }
 691           if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 692             {
 693               tmp_bi = tmp->next_buffer;
 694               tmp = vlib_get_buffer (vm, tmp->next_buffer);
 695             }
 696           else
 697             {
 698               break;
 699             }
 700         }
 701       sub_chain_bi =
 702         vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
 703         reass.next_range_bi;
 704     }
 705   while (~0 != sub_chain_bi);
 706
 707   if (!last_b)
 708     {
 709       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 710       goto free_buffers_and_return;
 711     }
 712   last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 713   vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
 714   if (total_length < first_b->current_length)
 715     {
 716       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 717       goto free_buffers_and_return;
 718     }
 719   total_length -= first_b->current_length;
 720   first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
 721   first_b->total_length_not_including_first_buffer = total_length;
 722   // drop fragment header
 723   vnet_buffer_opaque_t *first_b_vnb = vnet_buffer (first_b);
 724   ip6_header_t *ip = vlib_buffer_get_current (first_b);
 725   u16 ip6_frag_hdr_offset = first_b_vnb->ip.reass.ip6_frag_hdr_offset;
 726   ip6_ext_header_t *prev_hdr;
 727   frag_hdr =
 728     ip6_ext_header_find (vm, first_b, ip, IP_PROTOCOL_IPV6_FRAGMENTATION,
 729                          &prev_hdr);
 730   if (prev_hdr)
 731     {
 732       prev_hdr->next_hdr = frag_hdr->next_hdr;
 733     }
 734   else
 735     {
 736       ip->protocol = frag_hdr->next_hdr;
 737     }
 738   if (!((u8 *) frag_hdr - (u8 *) ip == ip6_frag_hdr_offset))
 739     {
 740       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 741       goto free_buffers_and_return;
 742     }
 743   memmove (frag_hdr, (u8 *) frag_hdr + sizeof (*frag_hdr),
 744            first_b->current_length - ip6_frag_hdr_offset -
 745            sizeof (ip6_frag_hdr_t));
 746   first_b->current_length -= sizeof (*frag_hdr);
 747   ip->payload_length =
 748     clib_host_to_net_u16 (total_length + first_b->current_length -
 749                           sizeof (*ip));
 750   if (!vlib_buffer_chain_linearize (vm, first_b))
 751     {
 752       rv = IP6_FULL_REASS_RC_NO_BUF;
 753       goto free_buffers_and_return;
 754     }
 755   first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
 756   if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
 757     {
 758       ip6_full_reass_add_trace (vm, node, rm, reass, reass->first_bi, NULL,
 759                                 FINALIZE, ~0);
 760 #if 0
 761       // following code does a hexdump of packet fragments to stdout ...
 762       do
 763         {
 764           u32 bi = reass->first_bi;
 765           u8 *s = NULL;
 766           while (~0 != bi)
 767             {
 768               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 769               s = format (s, "%u: %U\n", bi, format_hexdump,
 770                           vlib_buffer_get_current (b), b->current_length);
 771               if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 772                 {
 773                   bi = b->next_buffer;
 774                 }
 775               else
 776                 {
 777                   break;
 778                 }
 779             }
 780           printf ("%.*s\n", vec_len (s), s);
 781           fflush (stdout);
 782           vec_free (s);
 783         }
 784       while (0);
 785 #endif
 786     }
 787   if (!is_custom_app)
 788     {
 789       *next0 = IP6_FULL_REASSEMBLY_NEXT_INPUT;
 790     }
 791   else
 792     {
 793       *next0 = reass->next_index;
 794     }
 795   vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
 796   ip6_full_reass_free (rm, rt, reass);
 797   reass = NULL;
 798 free_buffers_and_return:
 799   vlib_buffer_free (vm, vec_drop_compress, vec_len (vec_drop_compress));
 800   vec_free (vec_drop_compress);
 801   return rv;
 802 }
 803
 804 always_inline void
 805 ip6_full_reass_insert_range_in_chain (vlib_main_t * vm,
 806                                       ip6_full_reass_main_t * rm,
 807                                       ip6_full_reass_per_thread_t * rt,
 808                                       ip6_full_reass_t * reass,
 809                                       u32 prev_range_bi, u32 new_next_bi)
 810 {
 811
 812   vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
 813   vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
 814   if (~0 != prev_range_bi)
 815     {
 816       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 817       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 818       new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
 819       prev_vnb->ip.reass.next_range_bi = new_next_bi;
 820     }
 821   else
 822     {
 823       if (~0 != reass->first_bi)
 824         {
 825           new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
 826         }
 827       reass->first_bi = new_next_bi;
 828     }
 829   reass->data_len += ip6_full_reass_buffer_get_data_len (new_next_b);
 830 }
 831
 832 always_inline ip6_full_reass_rc_t
 833 ip6_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 834                        ip6_full_reass_main_t * rm,
 835                        ip6_full_reass_per_thread_t * rt,
 836                        ip6_full_reass_t * reass, u32 * bi0, u32 * next0,
 837                        u32 * error0, ip6_frag_hdr_t * frag_hdr,
 838                        bool is_custom_app, u32 * handoff_thread_idx)
 839 {
 840   int consumed = 0;
 841   vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
 842   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 843   if (is_custom_app)
 844     {
 845       reass->next_index = fvnb->ip.reass.next_index;    // store next_index before it's overwritten
 846       reass->error_next_index = fvnb->ip.reass.error_next_index;        // store error_next_index before it is overwritten
 847     }
 848
 849   fvnb->ip.reass.ip6_frag_hdr_offset =
 850     (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
 851   ip6_header_t *fip = vlib_buffer_get_current (fb);
 852   if (fb->current_length < sizeof (*fip) ||
 853       fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
 854       fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
 855     {
 856       return IP6_FULL_REASS_RC_INTERNAL_ERROR;
 857     }
 858
 859   u32 fragment_first = fvnb->ip.reass.fragment_first =
 860     ip6_frag_hdr_offset_bytes (frag_hdr);
 861   u32 fragment_length =
 862     vlib_buffer_length_in_chain (vm, fb) -
 863     (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 864   u32 fragment_last = fvnb->ip.reass.fragment_last =
 865     fragment_first + fragment_length - 1;
 866   int more_fragments = ip6_frag_hdr_more (frag_hdr);
 867   u32 candidate_range_bi = reass->first_bi;
 868   u32 prev_range_bi = ~0;
 869   fvnb->ip.reass.range_first = fragment_first;
 870   fvnb->ip.reass.range_last = fragment_last;
 871   fvnb->ip.reass.next_range_bi = ~0;
 872   if (!more_fragments)
 873     {
 874       reass->last_packet_octet = fragment_last;
 875     }
 876   if (~0 == reass->first_bi)
 877     {
 878       // starting a new reassembly
 879       ip6_full_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi,
 880                                             *bi0);
 881       reass->min_fragment_length = clib_net_to_host_u16 (fip->payload_length);
 882       consumed = 1;
 883       reass->fragments_n = 1;
 884       goto check_if_done_maybe;
 885     }
 886   reass->min_fragment_length =
 887     clib_min (clib_net_to_host_u16 (fip->payload_length),
 888               fvnb->ip.reass.estimated_mtu);
 889   while (~0 != candidate_range_bi)
 890     {
 891       vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
 892       vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
 893       if (fragment_first > candidate_vnb->ip.reass.range_last)
 894         {
 895           // this fragments starts after candidate range
 896           prev_range_bi = candidate_range_bi;
 897           candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
 898           if (candidate_vnb->ip.reass.range_last < fragment_last &&
 899               ~0 == candidate_range_bi)
 900             {
 901               // special case - this fragment falls beyond all known ranges
 902               ip6_full_reass_insert_range_in_chain (vm, rm, rt, reass,
 903                                                     prev_range_bi, *bi0);
 904               consumed = 1;
 905               break;
 906             }
 907           continue;
 908         }
 909       if (fragment_last < candidate_vnb->ip.reass.range_first)
 910         {
 911           // this fragment ends before candidate range without any overlap
 912           ip6_full_reass_insert_range_in_chain (vm, rm, rt, reass,
 913                                                 prev_range_bi, *bi0);
 914           consumed = 1;
 915         }
 916       else if (fragment_first == candidate_vnb->ip.reass.range_first &&
 917                fragment_last == candidate_vnb->ip.reass.range_last)
 918         {
 919           // duplicate fragment - ignore
 920         }
 921       else
 922         {
 923           // overlapping fragment - not allowed by RFC 8200
 924           if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 925             {
 926               ip6_full_reass_add_trace (vm, node, rm, reass, *bi0, frag_hdr,
 927                                         RANGE_OVERLAP, ~0);
 928             }
 929           ip6_full_reass_drop_all (vm, node, rm, reass);
 930           ip6_full_reass_free (rm, rt, reass);
 931           *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
 932           *error0 = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT;
 933           return IP6_FULL_REASS_RC_OK;
 934         }
 935       break;
 936     }
 937   ++reass->fragments_n;
 938 check_if_done_maybe:
 939   if (consumed)
 940     {
 941       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 942         {
 943           ip6_full_reass_add_trace (vm, node, rm, reass, *bi0, frag_hdr,
 944                                     RANGE_NEW, ~0);
 945         }
 946     }
 947   if (~0 != reass->last_packet_octet &&
 948       reass->data_len == reass->last_packet_octet + 1)
 949     {
 950       *handoff_thread_idx = reass->sendout_thread_index;
 951       int handoff =
 952         reass->memory_owner_thread_index != reass->sendout_thread_index;
 953       ip6_full_reass_rc_t rc =
 954         ip6_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
 955                                  is_custom_app);
 956       if (IP6_FULL_REASS_RC_OK == rc && handoff)
 957         {
 958           return IP6_FULL_REASS_RC_HANDOFF;
 959         }
 960       return rc;
 961     }
 962   else
 963     {
 964       if (consumed)
 965         {
 966           *bi0 = ~0;
 967           if (reass->fragments_n > rm->max_reass_len)
 968             {
 969               return IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS;
 970             }
 971         }
 972       else
 973         {
 974           *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
 975           *error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT;
 976         }
 977     }
 978   return IP6_FULL_REASS_RC_OK;
 979 }
 980
 981 always_inline bool
 982 ip6_full_reass_verify_upper_layer_present (vlib_node_runtime_t * node,
 983                                            vlib_buffer_t * b,
 984                                            ip6_frag_hdr_t * frag_hdr)
 985 {
 986   ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr;
 987   while (ip6_ext_hdr (tmp->next_hdr))
 988     {
 989       tmp = ip6_ext_next_header (tmp);
 990     }
 991   if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr)
 992     {
 993       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 994                                    ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
 995                                    0);
 996       b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
 997
 998       return false;
 999     }
1000   return true;
1001 }
1002
1003 always_inline bool
1004 ip6_full_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
1005                                            vlib_node_runtime_t * node,
1006                                            vlib_buffer_t * b,
1007                                            ip6_frag_hdr_t * frag_hdr)
1008 {
1009   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1010   ip6_header_t *ip = vlib_buffer_get_current (b);
1011   int more_fragments = ip6_frag_hdr_more (frag_hdr);
1012   u32 fragment_length =
1013     vlib_buffer_length_in_chain (vm, b) -
1014     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
1015   if (more_fragments && 0 != fragment_length % 8)
1016     {
1017       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
1018                                    ICMP6_parameter_problem_erroneous_header_field,
1019                                    (u8 *) & ip->payload_length - (u8 *) ip);
1020       return false;
1021     }
1022   return true;
1023 }
1024
1025 always_inline bool
1026 ip6_full_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
1027                                           vlib_node_runtime_t * node,
1028                                           vlib_buffer_t * b,
1029                                           ip6_frag_hdr_t * frag_hdr)
1030 {
1031   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1032   u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
1033   u32 fragment_length =
1034     vlib_buffer_length_in_chain (vm, b) -
1035     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
1036   if (fragment_first + fragment_length > 65535)
1037     {
1038       ip6_header_t *ip0 = vlib_buffer_get_current (b);
1039       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
1040                                    ICMP6_parameter_problem_erroneous_header_field,
1041                                    (u8 *) & frag_hdr->fragment_offset_and_more
1042                                    - (u8 *) ip0);
1043       return false;
1044     }
1045   return true;
1046 }
1047
1048 always_inline uword
1049 ip6_full_reassembly_inline (vlib_main_t * vm,
1050                             vlib_node_runtime_t * node,
1051                             vlib_frame_t * frame, bool is_feature,
1052                             bool is_custom_app)
1053 {
1054   u32 *from = vlib_frame_vector_args (frame);
1055   u32 n_left_from, n_left_to_next, *to_next, next_index;
1056   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1057   ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1058   clib_spinlock_lock (&rt->lock);
1059
1060   n_left_from = frame->n_vectors;
1061   next_index = node->cached_next_index;
1062   while (n_left_from > 0)
1063     {
1064       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1065
1066       while (n_left_from > 0 && n_left_to_next > 0)
1067         {
1068           u32 bi0;
1069           vlib_buffer_t *b0;
1070           u32 next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1071           u32 error0 = IP6_ERROR_NONE;
1072           u32 icmp_bi = ~0;
1073
1074           bi0 = from[0];
1075           b0 = vlib_get_buffer (vm, bi0);
1076
1077           ip6_header_t *ip0 = vlib_buffer_get_current (b0);
1078           ip6_frag_hdr_t *frag_hdr = NULL;
1079           ip6_ext_header_t *prev_hdr;
1080           if (ip6_ext_hdr (ip0->protocol))
1081             {
1082               frag_hdr =
1083                 ip6_ext_header_find (vm, b0, ip0,
1084                                      IP_PROTOCOL_IPV6_FRAGMENTATION,
1085                                      &prev_hdr);
1086             }
1087           if (!frag_hdr)
1088             {
1089               // this is a regular packet - no fragmentation
1090               next0 = IP6_FULL_REASSEMBLY_NEXT_INPUT;
1091               goto skip_reass;
1092             }
1093           vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
1094             (u8 *) frag_hdr - (u8 *) ip0;
1095
1096           if (0 == ip6_frag_hdr_offset (frag_hdr))
1097             {
1098               // first fragment - verify upper-layer is present
1099               if (!ip6_full_reass_verify_upper_layer_present
1100                   (node, b0, frag_hdr))
1101                 {
1102                   next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1103                   goto skip_reass;
1104                 }
1105             }
1106           if (!ip6_full_reass_verify_fragment_multiple_8
1107               (vm, node, b0, frag_hdr)
1108               || !ip6_full_reass_verify_packet_size_lt_64k (vm, node, b0,
1109                                                             frag_hdr))
1110             {
1111               next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1112               goto skip_reass;
1113             }
1114           ip6_full_reass_kv_t kv;
1115           u8 do_handoff = 0;
1116
1117           kv.k.as_u64[0] = ip0->src_address.as_u64[0];
1118           kv.k.as_u64[1] = ip0->src_address.as_u64[1];
1119           kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
1120           kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
1121           kv.k.as_u64[4] =
1122             ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
1123                             vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
1124             (u64) frag_hdr->identification;
1125           kv.k.as_u64[5] = ip0->protocol;
1126
1127           ip6_full_reass_t *reass =
1128             ip6_full_reass_find_or_create (vm, node, rm, rt, &kv, &icmp_bi,
1129                                            &do_handoff);
1130
1131           if (reass)
1132             {
1133               const u32 fragment_first = ip6_frag_hdr_offset (frag_hdr);
1134               if (0 == fragment_first)
1135                 {
1136                   reass->sendout_thread_index = vm->thread_index;
1137                 }
1138             }
1139           if (PREDICT_FALSE (do_handoff))
1140             {
1141               next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
1142               vnet_buffer (b0)->ip.reass.owner_thread_index =
1143                 kv.v.memory_owner_thread_index;
1144             }
1145           else if (reass)
1146             {
1147               u32 handoff_thread_idx;
1148               switch (ip6_full_reass_update
1149                       (vm, node, rm, rt, reass, &bi0, &next0, &error0,
1150                        frag_hdr, is_custom_app, &handoff_thread_idx))
1151                 {
1152                 case IP6_FULL_REASS_RC_OK:
1153                   /* nothing to do here */
1154                   break;
1155                 case IP6_FULL_REASS_RC_HANDOFF:
1156                   next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
1157                   b0 = vlib_get_buffer (vm, bi0);
1158                   vnet_buffer (b0)->ip.reass.owner_thread_index =
1159                     handoff_thread_idx;
1160                   break;
1161                 case IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS:
1162                   vlib_node_increment_counter (vm, node->node_index,
1163                                                IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
1164                                                1);
1165                   ip6_full_reass_drop_all (vm, node, rm, reass);
1166                   ip6_full_reass_free (rm, rt, reass);
1167                   goto next_packet;
1168                   break;
1169                 case IP6_FULL_REASS_RC_NO_BUF:
1170                   vlib_node_increment_counter (vm, node->node_index,
1171                                                IP6_ERROR_REASS_NO_BUF, 1);
1172                   ip6_full_reass_drop_all (vm, node, rm, reass);
1173                   ip6_full_reass_free (rm, rt, reass);
1174                   goto next_packet;
1175                   break;
1176                 case IP6_FULL_REASS_RC_INTERNAL_ERROR:
1177                   vlib_node_increment_counter (vm, node->node_index,
1178                                                IP6_ERROR_REASS_INTERNAL_ERROR,
1179                                                1);
1180                   ip6_full_reass_drop_all (vm, node, rm, reass);
1181                   ip6_full_reass_free (rm, rt, reass);
1182                   goto next_packet;
1183                   break;
1184                 }
1185             }
1186           else
1187             {
1188               if (is_feature)
1189                 {
1190                   next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1191                 }
1192               else
1193                 {
1194                   vnet_buffer_opaque_t *fvnb = vnet_buffer (b0);
1195                   next0 = fvnb->ip.reass.error_next_index;
1196                 }
1197               error0 = IP6_ERROR_REASS_LIMIT_REACHED;
1198             }
1199
1200           if (~0 != bi0)
1201             {
1202             skip_reass:
1203               to_next[0] = bi0;
1204               to_next += 1;
1205               n_left_to_next -= 1;
1206
1207               /* bi0 might have been updated by reass_finalize, reload */
1208               b0 = vlib_get_buffer (vm, bi0);
1209               if (IP6_ERROR_NONE != error0)
1210                 {
1211                   b0->error = node->errors[error0];
1212                 }
1213
1214               if (next0 == IP6_FULL_REASSEMBLY_NEXT_HANDOFF)
1215                 {
1216                   if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1217                     {
1218                       ip6_full_reass_add_trace (vm, node, rm, NULL, bi0,
1219                                                 frag_hdr, HANDOFF,
1220                                                 vnet_buffer (b0)->ip.
1221                                                 reass.owner_thread_index);
1222                     }
1223                 }
1224               else if (is_feature && IP6_ERROR_NONE == error0)
1225                 {
1226                   vnet_feature_next (&next0, b0);
1227                 }
1228               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1229                                                n_left_to_next, bi0, next0);
1230             }
1231
1232           if (~0 != icmp_bi)
1233             {
1234               next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1235               to_next[0] = icmp_bi;
1236               to_next += 1;
1237               n_left_to_next -= 1;
1238               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1239                                                n_left_to_next, icmp_bi,
1240                                                next0);
1241             }
1242         next_packet:
1243           from += 1;
1244           n_left_from -= 1;
1245         }
1246
1247       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1248     }
1249
1250   clib_spinlock_unlock (&rt->lock);
1251   return frame->n_vectors;
1252 }
1253
1254 static char *ip6_full_reassembly_error_strings[] = {
1255 #define _(sym, string) string,
1256   foreach_ip6_error
1257 #undef _
1258 };
1259
1260 VLIB_NODE_FN (ip6_full_reass_node) (vlib_main_t * vm,
1261                                     vlib_node_runtime_t * node,
1262                                     vlib_frame_t * frame)
1263 {
1264   return ip6_full_reassembly_inline (vm, node, frame, false /* is_feature */ ,
1265                                      false /* is_custom_app */ );
1266 }
1267
1268 /* *INDENT-OFF* */
1269 VLIB_REGISTER_NODE (ip6_full_reass_node) = {
1270     .name = "ip6-full-reassembly",
1271     .vector_size = sizeof (u32),
1272     .format_trace = format_ip6_full_reass_trace,
1273     .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1274     .error_strings = ip6_full_reassembly_error_strings,
1275     .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1276     .next_nodes =
1277         {
1278                 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1279                 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1280                 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1281                 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reassembly-handoff",
1282         },
1283 };
1284 /* *INDENT-ON* */
1285
1286 VLIB_NODE_FN (ip6_full_reass_node_feature) (vlib_main_t * vm,
1287                                             vlib_node_runtime_t * node,
1288                                             vlib_frame_t * frame)
1289 {
1290   return ip6_full_reassembly_inline (vm, node, frame, true /* is_feature */ ,
1291                                      false /* is_custom_app */ );
1292 }
1293
1294 /* *INDENT-OFF* */
1295 VLIB_REGISTER_NODE (ip6_full_reass_node_feature) = {
1296     .name = "ip6-full-reassembly-feature",
1297     .vector_size = sizeof (u32),
1298     .format_trace = format_ip6_full_reass_trace,
1299     .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1300     .error_strings = ip6_full_reassembly_error_strings,
1301     .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1302     .next_nodes =
1303         {
1304                 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1305                 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1306                 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1307                 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reass-feature-hoff",
1308         },
1309 };
1310 /* *INDENT-ON* */
1311
1312 /* *INDENT-OFF* */
1313 VNET_FEATURE_INIT (ip6_full_reassembly_feature, static) = {
1314     .arc_name = "ip6-unicast",
1315     .node_name = "ip6-full-reassembly-feature",
1316     .runs_before = VNET_FEATURES ("ip6-lookup",
1317                                   "ipsec6-input-feature"),
1318     .runs_after = 0,
1319 };
1320 /* *INDENT-ON* */
1321
1322 #ifndef CLIB_MARCH_VARIANT
1323 static u32
1324 ip6_full_reass_get_nbuckets ()
1325 {
1326   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1327   u32 nbuckets;
1328   u8 i;
1329
1330   nbuckets = (u32) (rm->max_reass_n / IP6_FULL_REASS_HT_LOAD_FACTOR);
1331
1332   for (i = 0; i < 31; i++)
1333     if ((1 << i) >= nbuckets)
1334       break;
1335   nbuckets = 1 << i;
1336
1337   return nbuckets;
1338 }
1339 #endif /* CLIB_MARCH_VARIANT */
1340
1341 typedef enum
1342 {
1343   IP6_EVENT_CONFIG_CHANGED = 1,
1344 } ip6_full_reass_event_t;
1345
1346 #ifndef CLIB_MARCH_VARIANT
1347 typedef struct
1348 {
1349   int failure;
1350   clib_bihash_48_8_t *new_hash;
1351 } ip6_rehash_cb_ctx;
1352
1353 static int
1354 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
1355 {
1356   ip6_rehash_cb_ctx *ctx = _ctx;
1357   if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
1358     {
1359       ctx->failure = 1;
1360     }
1361   return (BIHASH_WALK_CONTINUE);
1362 }
1363
1364 static void
1365 ip6_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1366                            u32 max_reassembly_length,
1367                            u32 expire_walk_interval_ms)
1368 {
1369   ip6_full_reass_main.timeout_ms = timeout_ms;
1370   ip6_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1371   ip6_full_reass_main.max_reass_n = max_reassemblies;
1372   ip6_full_reass_main.max_reass_len = max_reassembly_length;
1373   ip6_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1374 }
1375
1376 vnet_api_error_t
1377 ip6_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
1378                     u32 max_reassembly_length, u32 expire_walk_interval_ms)
1379 {
1380   u32 old_nbuckets = ip6_full_reass_get_nbuckets ();
1381   ip6_full_reass_set_params (timeout_ms, max_reassemblies,
1382                              max_reassembly_length, expire_walk_interval_ms);
1383   vlib_process_signal_event (ip6_full_reass_main.vlib_main,
1384                              ip6_full_reass_main.ip6_full_reass_expire_node_idx,
1385                              IP6_EVENT_CONFIG_CHANGED, 0);
1386   u32 new_nbuckets = ip6_full_reass_get_nbuckets ();
1387   if (ip6_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1388     {
1389       clib_bihash_48_8_t new_hash;
1390       clib_memset (&new_hash, 0, sizeof (new_hash));
1391       ip6_rehash_cb_ctx ctx;
1392       ctx.failure = 0;
1393       ctx.new_hash = &new_hash;
1394       clib_bihash_init_48_8 (&new_hash, "ip6-full-reass", new_nbuckets,
1395                              new_nbuckets * 1024);
1396       clib_bihash_foreach_key_value_pair_48_8 (&ip6_full_reass_main.hash,
1397                                                ip6_rehash_cb, &ctx);
1398       if (ctx.failure)
1399         {
1400           clib_bihash_free_48_8 (&new_hash);
1401           return -1;
1402         }
1403       else
1404         {
1405           clib_bihash_free_48_8 (&ip6_full_reass_main.hash);
1406           clib_memcpy_fast (&ip6_full_reass_main.hash, &new_hash,
1407                             sizeof (ip6_full_reass_main.hash));
1408           clib_bihash_copied (&ip6_full_reass_main.hash, &new_hash);
1409         }
1410     }
1411   return 0;
1412 }
1413
1414 vnet_api_error_t
1415 ip6_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1416                     u32 * max_reassembly_length,
1417                     u32 * expire_walk_interval_ms)
1418 {
1419   *timeout_ms = ip6_full_reass_main.timeout_ms;
1420   *max_reassemblies = ip6_full_reass_main.max_reass_n;
1421   *max_reassembly_length = ip6_full_reass_main.max_reass_len;
1422   *expire_walk_interval_ms = ip6_full_reass_main.expire_walk_interval_ms;
1423   return 0;
1424 }
1425
1426 static clib_error_t *
1427 ip6_full_reass_init_function (vlib_main_t * vm)
1428 {
1429   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1430   clib_error_t *error = 0;
1431   u32 nbuckets;
1432   vlib_node_t *node;
1433
1434   rm->vlib_main = vm;
1435
1436   vec_validate (rm->per_thread_data, vlib_num_workers ());
1437   ip6_full_reass_per_thread_t *rt;
1438   vec_foreach (rt, rm->per_thread_data)
1439   {
1440     clib_spinlock_init (&rt->lock);
1441     pool_alloc (rt->pool, rm->max_reass_n);
1442   }
1443
1444   node = vlib_get_node_by_name (vm, (u8 *) "ip6-full-reassembly-expire-walk");
1445   ASSERT (node);
1446   rm->ip6_full_reass_expire_node_idx = node->index;
1447
1448   ip6_full_reass_set_params (IP6_FULL_REASS_TIMEOUT_DEFAULT_MS,
1449                              IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT,
1450                              IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1451                              IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1452
1453   nbuckets = ip6_full_reass_get_nbuckets ();
1454   clib_bihash_init_48_8 (&rm->hash, "ip6-full-reass", nbuckets,
1455                          nbuckets * 1024);
1456
1457   node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
1458   ASSERT (node);
1459   rm->ip6_drop_idx = node->index;
1460   node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
1461   ASSERT (node);
1462   rm->ip6_icmp_error_idx = node->index;
1463
1464   if ((error = vlib_call_init_function (vm, ip_main_init)))
1465     return error;
1466   ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
1467                          ip6_full_reass_node.index);
1468
1469   rm->fq_index = vlib_frame_queue_main_init (ip6_full_reass_node.index, 0);
1470   rm->fq_feature_index =
1471     vlib_frame_queue_main_init (ip6_full_reass_node_feature.index, 0);
1472
1473   rm->feature_use_refcount_per_intf = NULL;
1474   return error;
1475 }
1476
1477 VLIB_INIT_FUNCTION (ip6_full_reass_init_function);
1478 #endif /* CLIB_MARCH_VARIANT */
1479
1480 static uword
1481 ip6_full_reass_walk_expired (vlib_main_t * vm,
1482                              vlib_node_runtime_t * node, vlib_frame_t * f)
1483 {
1484   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1485   uword event_type, *event_data = 0;
1486
1487   while (true)
1488     {
1489       vlib_process_wait_for_event_or_clock (vm,
1490                                             (f64) rm->expire_walk_interval_ms
1491                                             / (f64) MSEC_PER_SEC);
1492       event_type = vlib_process_get_events (vm, &event_data);
1493
1494       switch (event_type)
1495         {
1496         case ~0:                /* no events => timeout */
1497           /* nothing to do here */
1498           break;
1499         case IP6_EVENT_CONFIG_CHANGED:
1500           break;
1501         default:
1502           clib_warning ("BUG: event type 0x%wx", event_type);
1503           break;
1504         }
1505       f64 now = vlib_time_now (vm);
1506
1507       ip6_full_reass_t *reass;
1508       int *pool_indexes_to_free = NULL;
1509
1510       uword thread_index = 0;
1511       int index;
1512       const uword nthreads = vlib_num_workers () + 1;
1513       u32 *vec_icmp_bi = NULL;
1514       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1515         {
1516           ip6_full_reass_per_thread_t *rt =
1517             &rm->per_thread_data[thread_index];
1518           clib_spinlock_lock (&rt->lock);
1519
1520           vec_reset_length (pool_indexes_to_free);
1521           /* *INDENT-OFF* */
1522           pool_foreach_index (index, rt->pool, ({
1523                                 reass = pool_elt_at_index (rt->pool, index);
1524                                 if (now > reass->last_heard + rm->timeout)
1525                                   {
1526                                     vec_add1 (pool_indexes_to_free, index);
1527                                   }
1528                               }));
1529           /* *INDENT-ON* */
1530           int *i;
1531           /* *INDENT-OFF* */
1532           vec_foreach (i, pool_indexes_to_free)
1533           {
1534             ip6_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1535             u32 icmp_bi = ~0;
1536             ip6_full_reass_on_timeout (vm, node, rm, reass, &icmp_bi);
1537             if (~0 != icmp_bi)
1538               vec_add1 (vec_icmp_bi, icmp_bi);
1539
1540             ip6_full_reass_free (rm, rt, reass);
1541           }
1542           /* *INDENT-ON* */
1543
1544           clib_spinlock_unlock (&rt->lock);
1545         }
1546
1547       while (vec_len (vec_icmp_bi) > 0)
1548         {
1549           vlib_frame_t *f =
1550             vlib_get_frame_to_node (vm, rm->ip6_icmp_error_idx);
1551           u32 *to_next = vlib_frame_vector_args (f);
1552           u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
1553           int trace_frame = 0;
1554           while (vec_len (vec_icmp_bi) > 0 && n_left_to_next > 0)
1555             {
1556               u32 bi = vec_pop (vec_icmp_bi);
1557               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1558               if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1559                 trace_frame = 1;
1560               b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
1561               to_next[0] = bi;
1562               ++f->n_vectors;
1563               to_next += 1;
1564               n_left_to_next -= 1;
1565             }
1566           f->frame_flags |= (trace_frame * VLIB_FRAME_TRACE);
1567           vlib_put_frame_to_node (vm, rm->ip6_icmp_error_idx, f);
1568         }
1569
1570       vec_free (pool_indexes_to_free);
1571       vec_free (vec_icmp_bi);
1572       if (event_data)
1573         {
1574           _vec_len (event_data) = 0;
1575         }
1576     }
1577
1578   return 0;
1579 }
1580
1581 /* *INDENT-OFF* */
1582 VLIB_REGISTER_NODE (ip6_full_reass_expire_node) = {
1583     .function = ip6_full_reass_walk_expired,
1584     .format_trace = format_ip6_full_reass_trace,
1585     .type = VLIB_NODE_TYPE_PROCESS,
1586     .name = "ip6-full-reassembly-expire-walk",
1587
1588     .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1589     .error_strings = ip6_full_reassembly_error_strings,
1590
1591 };
1592 /* *INDENT-ON* */
1593
1594 static u8 *
1595 format_ip6_full_reass_key (u8 * s, va_list * args)
1596 {
1597   ip6_full_reass_key_t *key = va_arg (*args, ip6_full_reass_key_t *);
1598   s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1599               key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1600               &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1601   return s;
1602 }
1603
1604 static u8 *
1605 format_ip6_full_reass (u8 * s, va_list * args)
1606 {
1607   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1608   ip6_full_reass_t *reass = va_arg (*args, ip6_full_reass_t *);
1609
1610   s = format (s, "ID: %lu, key: %U\n  first_bi: %u, data_len: %u, "
1611               "last_packet_octet: %u, trace_op_counter: %u\n",
1612               reass->id, format_ip6_full_reass_key, &reass->key,
1613               reass->first_bi, reass->data_len, reass->last_packet_octet,
1614               reass->trace_op_counter);
1615   u32 bi = reass->first_bi;
1616   u32 counter = 0;
1617   while (~0 != bi)
1618     {
1619       vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1620       vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1621       s = format (s, "  #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1622                   "fragment[%u, %u]\n",
1623                   counter, vnb->ip.reass.range_first,
1624                   vnb->ip.reass.range_last, bi,
1625                   ip6_full_reass_buffer_get_data_offset (b),
1626                   ip6_full_reass_buffer_get_data_len (b),
1627                   vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1628       if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1629         {
1630           bi = b->next_buffer;
1631         }
1632       else
1633         {
1634           bi = ~0;
1635         }
1636     }
1637   return s;
1638 }
1639
1640 static clib_error_t *
1641 show_ip6_full_reass (vlib_main_t * vm, unformat_input_t * input,
1642                      CLIB_UNUSED (vlib_cli_command_t * lmd))
1643 {
1644   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1645
1646   vlib_cli_output (vm, "---------------------");
1647   vlib_cli_output (vm, "IP6 reassembly status");
1648   vlib_cli_output (vm, "---------------------");
1649   bool details = false;
1650   if (unformat (input, "details"))
1651     {
1652       details = true;
1653     }
1654
1655   u32 sum_reass_n = 0;
1656   u64 sum_buffers_n = 0;
1657   ip6_full_reass_t *reass;
1658   uword thread_index;
1659   const uword nthreads = vlib_num_workers () + 1;
1660   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1661     {
1662       ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1663       clib_spinlock_lock (&rt->lock);
1664       if (details)
1665         {
1666           /* *INDENT-OFF* */
1667           pool_foreach (reass, rt->pool, {
1668             vlib_cli_output (vm, "%U", format_ip6_full_reass, vm, reass);
1669           });
1670           /* *INDENT-ON* */
1671         }
1672       sum_reass_n += rt->reass_n;
1673       clib_spinlock_unlock (&rt->lock);
1674     }
1675   vlib_cli_output (vm, "---------------------");
1676   vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1677                    (long unsigned) sum_reass_n);
1678   vlib_cli_output (vm,
1679                    "Maximum configured concurrent full IP6 reassemblies per worker-thread: %lu\n",
1680                    (long unsigned) rm->max_reass_n);
1681   vlib_cli_output (vm,
1682                    "Maximum configured full IP6 reassembly timeout: %lums\n",
1683                    (long unsigned) rm->timeout_ms);
1684   vlib_cli_output (vm,
1685                    "Maximum configured full IP6 reassembly expire walk interval: %lums\n",
1686                    (long unsigned) rm->expire_walk_interval_ms);
1687   vlib_cli_output (vm, "Buffers in use: %lu\n",
1688                    (long unsigned) sum_buffers_n);
1689   return 0;
1690 }
1691
1692 /* *INDENT-OFF* */
1693 VLIB_CLI_COMMAND (show_ip6_full_reassembly_cmd, static) = {
1694     .path = "show ip6-full-reassembly",
1695     .short_help = "show ip6-full-reassembly [details]",
1696     .function = show_ip6_full_reass,
1697 };
1698 /* *INDENT-ON* */
1699
1700 #ifndef CLIB_MARCH_VARIANT
1701 vnet_api_error_t
1702 ip6_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1703 {
1704   return vnet_feature_enable_disable ("ip6-unicast",
1705                                       "ip6-full-reassembly-feature",
1706                                       sw_if_index, enable_disable, 0, 0);
1707 }
1708 #endif /* CLIB_MARCH_VARIANT */
1709
1710 #define foreach_ip6_full_reassembly_handoff_error                       \
1711 _(CONGESTION_DROP, "congestion drop")
1712
1713
1714 typedef enum
1715 {
1716 #define _(sym,str) IP6_FULL_REASSEMBLY_HANDOFF_ERROR_##sym,
1717   foreach_ip6_full_reassembly_handoff_error
1718 #undef _
1719     IP6_FULL_REASSEMBLY_HANDOFF_N_ERROR,
1720 } ip6_full_reassembly_handoff_error_t;
1721
1722 static char *ip6_full_reassembly_handoff_error_strings[] = {
1723 #define _(sym,string) string,
1724   foreach_ip6_full_reassembly_handoff_error
1725 #undef _
1726 };
1727
1728 typedef struct
1729 {
1730   u32 next_worker_index;
1731 } ip6_full_reassembly_handoff_trace_t;
1732
1733 static u8 *
1734 format_ip6_full_reassembly_handoff_trace (u8 * s, va_list * args)
1735 {
1736   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1737   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1738   ip6_full_reassembly_handoff_trace_t *t =
1739     va_arg (*args, ip6_full_reassembly_handoff_trace_t *);
1740
1741   s =
1742     format (s, "ip6-full-reassembly-handoff: next-worker %d",
1743             t->next_worker_index);
1744
1745   return s;
1746 }
1747
1748 always_inline uword
1749 ip6_full_reassembly_handoff_inline (vlib_main_t * vm,
1750                                     vlib_node_runtime_t * node,
1751                                     vlib_frame_t * frame, bool is_feature)
1752 {
1753   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1754
1755   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1756   u32 n_enq, n_left_from, *from;
1757   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1758   u32 fq_index;
1759
1760   from = vlib_frame_vector_args (frame);
1761   n_left_from = frame->n_vectors;
1762   vlib_get_buffers (vm, from, bufs, n_left_from);
1763
1764   b = bufs;
1765   ti = thread_indices;
1766
1767   fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1768
1769   while (n_left_from > 0)
1770     {
1771       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1772
1773       if (PREDICT_FALSE
1774           ((node->flags & VLIB_NODE_FLAG_TRACE)
1775            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1776         {
1777           ip6_full_reassembly_handoff_trace_t *t =
1778             vlib_add_trace (vm, node, b[0], sizeof (*t));
1779           t->next_worker_index = ti[0];
1780         }
1781
1782       n_left_from -= 1;
1783       ti += 1;
1784       b += 1;
1785     }
1786   n_enq =
1787     vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1788                                    frame->n_vectors, 1);
1789
1790   if (n_enq < frame->n_vectors)
1791     vlib_node_increment_counter (vm, node->node_index,
1792                                  IP6_FULL_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1793                                  frame->n_vectors - n_enq);
1794   return frame->n_vectors;
1795 }
1796
1797 VLIB_NODE_FN (ip6_full_reassembly_handoff_node) (vlib_main_t * vm,
1798                                                  vlib_node_runtime_t * node,
1799                                                  vlib_frame_t * frame)
1800 {
1801   return ip6_full_reassembly_handoff_inline (vm, node, frame,
1802                                              false /* is_feature */ );
1803 }
1804
1805 /* *INDENT-OFF* */
1806 VLIB_REGISTER_NODE (ip6_full_reassembly_handoff_node) = {
1807   .name = "ip6-full-reassembly-handoff",
1808   .vector_size = sizeof (u32),
1809   .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
1810   .error_strings = ip6_full_reassembly_handoff_error_strings,
1811   .format_trace = format_ip6_full_reassembly_handoff_trace,
1812
1813   .n_next_nodes = 1,
1814
1815   .next_nodes = {
1816     [0] = "error-drop",
1817   },
1818 };
1819
1820
1821 VLIB_NODE_FN (ip6_full_reassembly_feature_handoff_node) (vlib_main_t * vm,
1822                                vlib_node_runtime_t * node, vlib_frame_t * frame)
1823 {
1824   return ip6_full_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1825 }
1826
1827
1828 /* *INDENT-OFF* */
1829 VLIB_REGISTER_NODE (ip6_full_reassembly_feature_handoff_node) = {
1830   .name = "ip6-full-reass-feature-hoff",
1831   .vector_size = sizeof (u32),
1832   .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
1833   .error_strings = ip6_full_reassembly_handoff_error_strings,
1834   .format_trace = format_ip6_full_reassembly_handoff_trace,
1835
1836   .n_next_nodes = 1,
1837
1838   .next_nodes = {
1839     [0] = "error-drop",
1840   },
1841 };
1842 /* *INDENT-ON* */
1843
1844 #ifndef CLIB_MARCH_VARIANT
1845 int
1846 ip6_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1847 {
1848   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1849   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1850   if (is_enable)
1851     {
1852       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1853         {
1854           ++rm->feature_use_refcount_per_intf[sw_if_index];
1855           return vnet_feature_enable_disable ("ip6-unicast",
1856                                               "ip6-full-reassembly-feature",
1857                                               sw_if_index, 1, 0, 0);
1858         }
1859       ++rm->feature_use_refcount_per_intf[sw_if_index];
1860     }
1861   else
1862     {
1863       --rm->feature_use_refcount_per_intf[sw_if_index];
1864       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1865         return vnet_feature_enable_disable ("ip6-unicast",
1866                                             "ip6-full-reassembly-feature",
1867                                             sw_if_index, 0, 0, 0);
1868     }
1869   return -1;
1870 }
1871 #endif
1872
1873 /*
1874  * fd.io coding-style-patch-verification: ON
1875  *
1876  * Local Variables:
1877  * eval: (c-set-style "gnu")
1878  * End:
1879  */