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 #include <vnet/ip/ip6_inlines.h>
  29
  30 #define MSEC_PER_SEC 1000
  31 #define IP6_FULL_REASS_TIMEOUT_DEFAULT_MS 200
  32 /* As there are only 1024 reass context per thread, either the DDOS attacks
  33  * or fractions of real timeouts, would consume these contexts quickly and
  34  * running out context space and unable to perform reassembly */
  35 #define IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 50 // 50 ms default
  36 #define IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT 1024
  37 #define IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
  38 #define IP6_FULL_REASS_HT_LOAD_FACTOR (0.75)
  39
  40 typedef enum
  41 {
  42   IP6_FULL_REASS_RC_OK,
  43   IP6_FULL_REASS_RC_INTERNAL_ERROR,
  44   IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS,
  45   IP6_FULL_REASS_RC_NO_BUF,
  46   IP6_FULL_REASS_RC_HANDOFF,
  47   IP6_FULL_REASS_RC_INVALID_FRAG_LEN,
  48   IP6_FULL_REASS_RC_OVERLAP,
  49 } ip6_full_reass_rc_t;
  50
  51 typedef struct
  52 {
  53   union
  54   {
  55     struct
  56     {
  57       ip6_address_t src;
  58       ip6_address_t dst;
  59       u32 xx_id;
  60       u32 frag_id;
  61       u8 unused[7];
  62       u8 proto;
  63     };
  64     u64 as_u64[6];
  65   };
  66 } ip6_full_reass_key_t;
  67
  68 typedef union
  69 {
  70   struct
  71   {
  72     u32 reass_index;
  73     u32 memory_owner_thread_index;
  74   };
  75   u64 as_u64;
  76 } ip6_full_reass_val_t;
  77
  78 typedef union
  79 {
  80   struct
  81   {
  82     ip6_full_reass_key_t k;
  83     ip6_full_reass_val_t v;
  84   };
  85   clib_bihash_kv_48_8_t kv;
  86 } ip6_full_reass_kv_t;
  87
  88
  89 always_inline u32
  90 ip6_full_reass_buffer_get_data_offset (vlib_buffer_t * b)
  91 {
  92   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
  93   return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first;
  94 }
  95
  96 always_inline u16
  97 ip6_full_reass_buffer_get_data_len (vlib_buffer_t * b)
  98 {
  99   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 100   return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) -
 101     (vnb->ip.reass.fragment_first +
 102      ip6_full_reass_buffer_get_data_offset (b)) + 1;
 103 }
 104
 105 typedef struct
 106 {
 107   // hash table key
 108   ip6_full_reass_key_t key;
 109   // time when last packet was received
 110   f64 last_heard;
 111   // internal id of this reassembly
 112   u64 id;
 113   // buffer index of first buffer in this reassembly context
 114   u32 first_bi;
 115   // last octet of packet, ~0 until fragment without more_fragments arrives
 116   u32 last_packet_octet;
 117   // length of data collected so far
 118   u32 data_len;
 119   // trace operation counter
 120   u32 trace_op_counter;
 121   // next index - used by custom apps (~0 if not set)
 122   u32 next_index;
 123   // error next index - used by custom apps (~0 if not set)
 124   u32 error_next_index;
 125   // minimum fragment length for this reassembly - used to estimate MTU
 126   u16 min_fragment_length;
 127   // number of fragments for this reassembly
 128   u32 fragments_n;
 129   // thread owning memory for this context (whose pool contains this ctx)
 130   u32 memory_owner_thread_index;
 131   // thread which received fragment with offset 0 and which sends out the
 132   // completed reassembly
 133   u32 sendout_thread_index;
 134 } ip6_full_reass_t;
 135
 136 typedef struct
 137 {
 138   ip6_full_reass_t *pool;
 139   u32 reass_n;
 140   u32 id_counter;
 141   // for pacing the main thread timeouts
 142   u32 last_id;
 143   clib_spinlock_t lock;
 144 } ip6_full_reass_per_thread_t;
 145
 146 typedef struct
 147 {
 148   // IPv6 config
 149   u32 timeout_ms;
 150   f64 timeout;
 151   u32 expire_walk_interval_ms;
 152   // maximum number of fragments in one reassembly
 153   u32 max_reass_len;
 154   // maximum number of reassemblies
 155   u32 max_reass_n;
 156
 157   // IPv6 runtime
 158   clib_bihash_48_8_t hash;
 159
 160   // per-thread data
 161   ip6_full_reass_per_thread_t *per_thread_data;
 162
 163   // convenience
 164   vlib_main_t *vlib_main;
 165
 166   u32 ip6_icmp_error_idx;
 167   u32 ip6_full_reass_expire_node_idx;
 168
 169   /** Worker handoff */
 170   u32 fq_index;
 171   u32 fq_local_index;
 172   u32 fq_feature_index;
 173   u32 fq_custom_index;
 174
 175   // reference count for enabling/disabling feature - per interface
 176   u32 *feature_use_refcount_per_intf;
 177
 178   // whether local fragmented packets are reassembled or not
 179   int is_local_reass_enabled;
 180 } ip6_full_reass_main_t;
 181
 182 extern ip6_full_reass_main_t ip6_full_reass_main;
 183
 184 #ifndef CLIB_MARCH_VARIANT
 185 ip6_full_reass_main_t ip6_full_reass_main;
 186 #endif /* CLIB_MARCH_VARIANT */
 187
 188 typedef enum
 189 {
 190   IP6_FULL_REASSEMBLY_NEXT_INPUT,
 191   IP6_FULL_REASSEMBLY_NEXT_DROP,
 192   IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR,
 193   IP6_FULL_REASSEMBLY_NEXT_HANDOFF,
 194   IP6_FULL_REASSEMBLY_N_NEXT,
 195 } ip6_full_reass_next_t;
 196
 197 typedef enum
 198 {
 199   NORMAL,
 200   FEATURE,
 201   CUSTOM
 202 } ip6_full_reass_node_type_t;
 203
 204 typedef enum
 205 {
 206   RANGE_NEW,
 207   RANGE_DISCARD,
 208   RANGE_OVERLAP,
 209   ICMP_ERROR_RT_EXCEEDED,
 210   ICMP_ERROR_FL_TOO_BIG,
 211   ICMP_ERROR_FL_NOT_MULT_8,
 212   FINALIZE,
 213   HANDOFF,
 214   PASSTHROUGH,
 215 } ip6_full_reass_trace_operation_e;
 216
 217 typedef struct
 218 {
 219   u16 range_first;
 220   u16 range_last;
 221   u32 range_bi;
 222   i32 data_offset;
 223   u32 data_len;
 224   u32 first_bi;
 225 } ip6_full_reass_range_trace_t;
 226
 227 typedef struct
 228 {
 229   ip6_full_reass_trace_operation_e action;
 230   u32 reass_id;
 231   ip6_full_reass_range_trace_t trace_range;
 232   u32 op_id;
 233   u32 fragment_first;
 234   u32 fragment_last;
 235   u32 total_data_len;
 236   u32 thread_id;
 237   u32 thread_id_to;
 238   bool is_after_handoff;
 239   ip6_header_t ip6_header;
 240   ip6_frag_hdr_t ip6_frag_header;
 241 } ip6_full_reass_trace_t;
 242
 243 static void
 244 ip6_full_reass_trace_details (vlib_main_t * vm, u32 bi,
 245                               ip6_full_reass_range_trace_t * trace)
 246 {
 247   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 248   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 249   trace->range_first = vnb->ip.reass.range_first;
 250   trace->range_last = vnb->ip.reass.range_last;
 251   trace->data_offset = ip6_full_reass_buffer_get_data_offset (b);
 252   trace->data_len = ip6_full_reass_buffer_get_data_len (b);
 253   trace->range_bi = bi;
 254 }
 255
 256 static u8 *
 257 format_ip6_full_reass_range_trace (u8 * s, va_list * args)
 258 {
 259   ip6_full_reass_range_trace_t *trace =
 260     va_arg (*args, ip6_full_reass_range_trace_t *);
 261   s =
 262     format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
 263             trace->range_last, trace->data_offset, trace->data_len,
 264             trace->range_bi);
 265   return s;
 266 }
 267
 268 static u8 *
 269 format_ip6_full_reass_trace (u8 * s, va_list * args)
 270 {
 271   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 272   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 273   ip6_full_reass_trace_t *t = va_arg (*args, ip6_full_reass_trace_t *);
 274   u32 indent = 0;
 275   if (~0 != t->reass_id)
 276     {
 277       if (t->is_after_handoff)
 278         {
 279           s =
 280             format (s, "%U\n", format_ip6_header, &t->ip6_header,
 281                     sizeof (t->ip6_header));
 282           s =
 283             format (s, "  %U\n", format_ip6_frag_hdr, &t->ip6_frag_header,
 284                     sizeof (t->ip6_frag_header));
 285           indent = 2;
 286         }
 287       s =
 288         format (s, "%Ureass id: %u, op id: %u, ", format_white_space, indent,
 289                 t->reass_id, t->op_id);
 290       indent = format_get_indent (s);
 291       s = format (s, "first bi: %u, data len: %u, ip/fragment[%u, %u]",
 292                   t->trace_range.first_bi, t->total_data_len,
 293                   t->fragment_first, t->fragment_last);
 294     }
 295   switch (t->action)
 296     {
 297     case RANGE_NEW:
 298       s = format (s, "\n%Unew %U", format_white_space, indent,
 299                   format_ip6_full_reass_range_trace, &t->trace_range);
 300       break;
 301     case RANGE_DISCARD:
 302       s = format (s, "\n%Udiscard %U", format_white_space, indent,
 303                   format_ip6_full_reass_range_trace, &t->trace_range);
 304       break;
 305     case RANGE_OVERLAP:
 306       s = format (s, "\n%Uoverlap %U", format_white_space, indent,
 307                   format_ip6_full_reass_range_trace, &t->trace_range);
 308       break;
 309     case ICMP_ERROR_FL_TOO_BIG:
 310       s = format (s, "\n%Uicmp-error - frag_len > 65535 %U",
 311                   format_white_space, indent,
 312                   format_ip6_full_reass_range_trace, &t->trace_range);
 313       break;
 314     case ICMP_ERROR_FL_NOT_MULT_8:
 315       s = format (s, "\n%Uicmp-error - frag_len mod 8 != 0 %U",
 316                   format_white_space, indent,
 317                   format_ip6_full_reass_range_trace, &t->trace_range);
 318       break;
 319     case ICMP_ERROR_RT_EXCEEDED:
 320       s = format (s, "\n%Uicmp-error - reassembly time exceeded",
 321                   format_white_space, indent);
 322       break;
 323     case FINALIZE:
 324       s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
 325       break;
 326     case HANDOFF:
 327       s =
 328         format (s, "handoff from thread #%u to thread #%u", t->thread_id,
 329                 t->thread_id_to);
 330       break;
 331     case PASSTHROUGH:
 332       s = format (s, "passthrough - not a fragment");
 333       break;
 334     }
 335   return s;
 336 }
 337
 338 static void
 339 ip6_full_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 340                           ip6_full_reass_t * reass, u32 bi,
 341                           ip6_frag_hdr_t * ip6_frag_header,
 342                           ip6_full_reass_trace_operation_e action,
 343                           u32 thread_id_to)
 344 {
 345   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 346   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 347   bool is_after_handoff = false;
 348   if (pool_is_free_index
 349       (vm->trace_main.trace_buffer_pool, vlib_buffer_get_trace_index (b)))
 350     {
 351       // this buffer's trace is gone
 352       b->flags &= ~VLIB_BUFFER_IS_TRACED;
 353       return;
 354     }
 355   if (vlib_buffer_get_trace_thread (b) != vm->thread_index)
 356     {
 357       is_after_handoff = true;
 358     }
 359   ip6_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 360   t->is_after_handoff = is_after_handoff;
 361   if (t->is_after_handoff)
 362     {
 363       clib_memcpy (&t->ip6_header, vlib_buffer_get_current (b),
 364                    clib_min (sizeof (t->ip6_header), b->current_length));
 365       if (ip6_frag_header)
 366         {
 367           clib_memcpy (&t->ip6_frag_header, ip6_frag_header,
 368                        sizeof (t->ip6_frag_header));
 369         }
 370       else
 371         {
 372           clib_memset (&t->ip6_frag_header, 0, sizeof (t->ip6_frag_header));
 373         }
 374     }
 375   if (reass)
 376     {
 377       t->reass_id = reass->id;
 378       t->op_id = reass->trace_op_counter;
 379       t->trace_range.first_bi = reass->first_bi;
 380       t->total_data_len = reass->data_len;
 381       ++reass->trace_op_counter;
 382     }
 383   else
 384     {
 385       t->reass_id = ~0;
 386     }
 387   t->action = action;
 388   t->thread_id = vm->thread_index;
 389   t->thread_id_to = thread_id_to;
 390   ip6_full_reass_trace_details (vm, bi, &t->trace_range);
 391   t->fragment_first = vnb->ip.reass.fragment_first;
 392   t->fragment_last = vnb->ip.reass.fragment_last;
 393 #if 0
 394   static u8 *s = NULL;
 395   s = format (s, "%U", format_ip6_full_reass_trace, NULL, NULL, t);
 396   printf ("%.*s\n", vec_len (s), s);
 397   fflush (stdout);
 398   vec_reset_length (s);
 399 #endif
 400 }
 401
 402 always_inline void
 403 ip6_full_reass_free_ctx (ip6_full_reass_per_thread_t * rt,
 404                          ip6_full_reass_t * reass)
 405 {
 406   pool_put (rt->pool, reass);
 407   --rt->reass_n;
 408 }
 409
 410 always_inline void
 411 ip6_full_reass_free (ip6_full_reass_main_t * rm,
 412                      ip6_full_reass_per_thread_t * rt,
 413                      ip6_full_reass_t * reass)
 414 {
 415   clib_bihash_kv_48_8_t kv;
 416   kv.key[0] = reass->key.as_u64[0];
 417   kv.key[1] = reass->key.as_u64[1];
 418   kv.key[2] = reass->key.as_u64[2];
 419   kv.key[3] = reass->key.as_u64[3];
 420   kv.key[4] = reass->key.as_u64[4];
 421   kv.key[5] = reass->key.as_u64[5];
 422   clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
 423   ip6_full_reass_free_ctx (rt, reass);
 424 }
 425
 426 /* n_left_to_next, and to_next are taken as input params, as this function
 427  * could be called from a graphnode, where its managing local copy of these
 428  * variables, and ignoring those and still trying to enqueue the buffers
 429  * with local variables would cause either buffer leak or corruption */
 430 always_inline void
 431 ip6_full_reass_drop_all (vlib_main_t *vm, vlib_node_runtime_t *node,
 432                          ip6_full_reass_t *reass, u32 *n_left_to_next,
 433                          u32 **to_next)
 434 {
 435   u32 range_bi = reass->first_bi;
 436   vlib_buffer_t *range_b;
 437   vnet_buffer_opaque_t *range_vnb;
 438   u32 *to_free = NULL;
 439
 440   while (~0 != range_bi)
 441     {
 442       range_b = vlib_get_buffer (vm, range_bi);
 443       range_vnb = vnet_buffer (range_b);
 444
 445       if (~0 != range_bi)
 446         {
 447           vec_add1 (to_free, range_bi);
 448         }
 449       range_bi = range_vnb->ip.reass.next_range_bi;
 450     }
 451
 452   /* send to next_error_index */
 453   if (~0 != reass->error_next_index &&
 454       reass->error_next_index < node->n_next_nodes)
 455     {
 456       u32 next_index;
 457
 458       next_index = reass->error_next_index;
 459       u32 bi = ~0;
 460
 461       /* record number of packets sent to custom app */
 462       vlib_node_increment_counter (vm, node->node_index,
 463                                    IP6_ERROR_REASS_TO_CUSTOM_APP,
 464                                    vec_len (to_free));
 465
 466       while (vec_len (to_free) > 0)
 467         {
 468           vlib_get_next_frame (vm, node, next_index, *to_next,
 469                                (*n_left_to_next));
 470
 471           while (vec_len (to_free) > 0 && (*n_left_to_next) > 0)
 472             {
 473               bi = vec_pop (to_free);
 474
 475               if (~0 != bi)
 476                 {
 477                   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 478                   if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
 479                     {
 480                       ip6_full_reass_add_trace (vm, node, reass, bi, NULL,
 481                                                 RANGE_DISCARD, ~0);
 482                     }
 483                   *to_next[0] = bi;
 484                   (*to_next) += 1;
 485                   (*n_left_to_next) -= 1;
 486                 }
 487             }
 488           vlib_put_next_frame (vm, node, next_index, (*n_left_to_next));
 489         }
 490     }
 491   else
 492     {
 493       vlib_buffer_free (vm, to_free, vec_len (to_free));
 494     }
 495   vec_free (to_free);
 496 }
 497
 498 always_inline void
 499 sanitize_reass_buffers_add_missing (vlib_main_t *vm, ip6_full_reass_t *reass,
 500                                     u32 *bi0)
 501 {
 502   u32 range_bi = reass->first_bi;
 503   vlib_buffer_t *range_b;
 504   vnet_buffer_opaque_t *range_vnb;
 505
 506   while (~0 != range_bi)
 507     {
 508       range_b = vlib_get_buffer (vm, range_bi);
 509       range_vnb = vnet_buffer (range_b);
 510       u32 bi = range_bi;
 511       if (~0 != bi)
 512         {
 513           if (bi == *bi0)
 514             *bi0 = ~0;
 515           if (range_b->flags & VLIB_BUFFER_NEXT_PRESENT)
 516             {
 517               u32 _bi = bi;
 518               vlib_buffer_t *_b = vlib_get_buffer (vm, _bi);
 519               while (_b->flags & VLIB_BUFFER_NEXT_PRESENT)
 520                 {
 521                   if (_b->next_buffer != range_vnb->ip.reass.next_range_bi)
 522                     {
 523                       _bi = _b->next_buffer;
 524                       _b = vlib_get_buffer (vm, _bi);
 525                     }
 526                   else
 527                     {
 528                       _b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 529                       break;
 530                     }
 531                 }
 532             }
 533           range_bi = range_vnb->ip.reass.next_range_bi;
 534         }
 535     }
 536   if (*bi0 != ~0)
 537     {
 538       vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
 539       vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 540       if (~0 != reass->first_bi)
 541         {
 542           fvnb->ip.reass.next_range_bi = reass->first_bi;
 543           reass->first_bi = *bi0;
 544         }
 545       else
 546         {
 547           reass->first_bi = *bi0;
 548           fvnb->ip.reass.next_range_bi = ~0;
 549         }
 550       *bi0 = ~0;
 551     }
 552 }
 553
 554 always_inline void
 555 ip6_full_reass_on_timeout (vlib_main_t *vm, vlib_node_runtime_t *node,
 556                            ip6_full_reass_t *reass, u32 *icmp_bi,
 557                            u32 *n_left_to_next, u32 **to_next)
 558 {
 559   if (~0 == reass->first_bi)
 560     {
 561       return;
 562     }
 563   if (~0 == reass->next_index)  // custom apps don't want icmp
 564     {
 565       vlib_buffer_t *b = vlib_get_buffer (vm, reass->first_bi);
 566       if (0 == vnet_buffer (b)->ip.reass.fragment_first)
 567         {
 568           *icmp_bi = reass->first_bi;
 569           if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
 570             {
 571               ip6_full_reass_add_trace (vm, node, reass, reass->first_bi, NULL,
 572                                         ICMP_ERROR_RT_EXCEEDED, ~0);
 573             }
 574           // fragment with offset zero received - send icmp message back
 575           if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 576             {
 577               // separate first buffer from chain and steer it towards icmp node
 578               b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 579               reass->first_bi = b->next_buffer;
 580             }
 581           else
 582             {
 583               reass->first_bi = vnet_buffer (b)->ip.reass.next_range_bi;
 584             }
 585           icmp6_error_set_vnet_buffer (b, ICMP6_time_exceeded,
 586                                        ICMP6_time_exceeded_fragment_reassembly_time_exceeded,
 587                                        0);
 588         }
 589     }
 590   ip6_full_reass_drop_all (vm, node, reass, n_left_to_next, to_next);
 591 }
 592
 593 always_inline ip6_full_reass_t *
 594 ip6_full_reass_find_or_create (vlib_main_t *vm, vlib_node_runtime_t *node,
 595                                ip6_full_reass_main_t *rm,
 596                                ip6_full_reass_per_thread_t *rt,
 597                                ip6_full_reass_kv_t *kv, u32 *icmp_bi,
 598                                u8 *do_handoff, int skip_bihash,
 599                                u32 *n_left_to_next, u32 **to_next)
 600 {
 601   ip6_full_reass_t *reass;
 602   f64 now;
 603
 604 again:
 605
 606   reass = NULL;
 607   now = vlib_time_now (vm);
 608
 609   if (!skip_bihash && !clib_bihash_search_48_8 (&rm->hash, &kv->kv, &kv->kv))
 610     {
 611       if (vm->thread_index != kv->v.memory_owner_thread_index)
 612         {
 613           *do_handoff = 1;
 614           return NULL;
 615         }
 616
 617       reass =
 618         pool_elt_at_index (rm->per_thread_data
 619                            [kv->v.memory_owner_thread_index].pool,
 620                            kv->v.reass_index);
 621
 622       if (now > reass->last_heard + rm->timeout)
 623         {
 624           vlib_node_increment_counter (vm, node->node_index,
 625                                        IP6_ERROR_REASS_TIMEOUT, 1);
 626           ip6_full_reass_on_timeout (vm, node, reass, icmp_bi, n_left_to_next,
 627                                      to_next);
 628           ip6_full_reass_free (rm, rt, reass);
 629           reass = NULL;
 630         }
 631     }
 632
 633   if (reass)
 634     {
 635       reass->last_heard = now;
 636       return reass;
 637     }
 638
 639   if (rt->reass_n >= rm->max_reass_n)
 640     {
 641       reass = NULL;
 642       return reass;
 643     }
 644   else
 645     {
 646       pool_get (rt->pool, reass);
 647       clib_memset (reass, 0, sizeof (*reass));
 648       reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 649       ++rt->id_counter;
 650       reass->first_bi = ~0;
 651       reass->last_packet_octet = ~0;
 652       reass->data_len = 0;
 653       reass->next_index = ~0;
 654       reass->error_next_index = ~0;
 655       reass->memory_owner_thread_index = vm->thread_index;
 656       ++rt->reass_n;
 657     }
 658
 659   kv->v.reass_index = (reass - rt->pool);
 660   kv->v.memory_owner_thread_index = vm->thread_index;
 661   reass->last_heard = now;
 662
 663   if (!skip_bihash)
 664     {
 665       reass->key.as_u64[0] = kv->kv.key[0];
 666       reass->key.as_u64[1] = kv->kv.key[1];
 667       reass->key.as_u64[2] = kv->kv.key[2];
 668       reass->key.as_u64[3] = kv->kv.key[3];
 669       reass->key.as_u64[4] = kv->kv.key[4];
 670       reass->key.as_u64[5] = kv->kv.key[5];
 671
 672       int rv = clib_bihash_add_del_48_8 (&rm->hash, &kv->kv, 2);
 673       if (rv)
 674         {
 675           ip6_full_reass_free (rm, rt, reass);
 676           reass = NULL;
 677           // if other worker created a context already work with the other copy
 678           if (-2 == rv)
 679             goto again;
 680         }
 681     }
 682   else
 683     {
 684       reass->key.as_u64[0] = ~0;
 685       reass->key.as_u64[1] = ~0;
 686       reass->key.as_u64[2] = ~0;
 687       reass->key.as_u64[3] = ~0;
 688       reass->key.as_u64[4] = ~0;
 689       reass->key.as_u64[5] = ~0;
 690     }
 691
 692   return reass;
 693 }
 694
 695 always_inline ip6_full_reass_rc_t
 696 ip6_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
 697                          ip6_full_reass_main_t * rm,
 698                          ip6_full_reass_per_thread_t * rt,
 699                          ip6_full_reass_t * reass, u32 * bi0, u32 * next0,
 700                          u32 * error0, bool is_custom_app)
 701 {
 702   *bi0 = reass->first_bi;
 703   *error0 = IP6_ERROR_NONE;
 704   ip6_frag_hdr_t *frag_hdr;
 705   vlib_buffer_t *last_b = NULL;
 706   u32 sub_chain_bi = reass->first_bi;
 707   u32 total_length = 0;
 708   u32 *vec_drop_compress = NULL;
 709   ip6_full_reass_rc_t rv = IP6_FULL_REASS_RC_OK;
 710   do
 711     {
 712       u32 tmp_bi = sub_chain_bi;
 713       vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
 714       vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
 715       if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 716           !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 717         {
 718           rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 719           goto free_buffers_and_return;
 720         }
 721
 722       u32 data_len = ip6_full_reass_buffer_get_data_len (tmp);
 723       u32 trim_front = vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
 724         sizeof (*frag_hdr) + ip6_full_reass_buffer_get_data_offset (tmp);
 725       u32 trim_end =
 726         vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
 727       if (tmp_bi == reass->first_bi)
 728         {
 729           /* first buffer - keep ip6 header */
 730           if (0 != ip6_full_reass_buffer_get_data_offset (tmp))
 731             {
 732               rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 733               goto free_buffers_and_return;
 734             }
 735           trim_front = 0;
 736           trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
 737             (vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
 738              sizeof (*frag_hdr));
 739           if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
 740             {
 741               rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 742               goto free_buffers_and_return;
 743             }
 744         }
 745       u32 keep_data =
 746         vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
 747       while (1)
 748         {
 749           if (trim_front)
 750             {
 751               if (trim_front > tmp->current_length)
 752                 {
 753                   /* drop whole buffer */
 754                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 755                     {
 756                       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 757                       goto free_buffers_and_return;
 758                     }
 759                   trim_front -= tmp->current_length;
 760                   vec_add1 (vec_drop_compress, tmp_bi);
 761                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 762                   tmp_bi = tmp->next_buffer;
 763                   tmp = vlib_get_buffer (vm, tmp_bi);
 764                   continue;
 765                 }
 766               else
 767                 {
 768                   vlib_buffer_advance (tmp, trim_front);
 769                   trim_front = 0;
 770                 }
 771             }
 772           if (keep_data)
 773             {
 774               if (last_b)
 775                 {
 776                   last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
 777                   last_b->next_buffer = tmp_bi;
 778                 }
 779               last_b = tmp;
 780               if (keep_data <= tmp->current_length)
 781                 {
 782                   tmp->current_length = keep_data;
 783                   keep_data = 0;
 784                 }
 785               else
 786                 {
 787                   keep_data -= tmp->current_length;
 788                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 789                     {
 790                       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 791                       goto free_buffers_and_return;
 792                     }
 793                 }
 794               total_length += tmp->current_length;
 795             }
 796           else
 797             {
 798               if (reass->first_bi == tmp_bi)
 799                 {
 800                   rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 801                   goto free_buffers_and_return;
 802                 }
 803               vec_add1 (vec_drop_compress, tmp_bi);
 804             }
 805           if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 806             {
 807               tmp_bi = tmp->next_buffer;
 808               tmp = vlib_get_buffer (vm, tmp->next_buffer);
 809             }
 810           else
 811             {
 812               break;
 813             }
 814         }
 815       sub_chain_bi =
 816         vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
 817         reass.next_range_bi;
 818     }
 819   while (~0 != sub_chain_bi);
 820
 821   if (!last_b)
 822     {
 823       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 824       goto free_buffers_and_return;
 825     }
 826   last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 827   vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
 828   if (total_length < first_b->current_length)
 829     {
 830       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 831       goto free_buffers_and_return;
 832     }
 833   total_length -= first_b->current_length;
 834   first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
 835   first_b->total_length_not_including_first_buffer = total_length;
 836   // drop fragment header
 837   vnet_buffer_opaque_t *first_b_vnb = vnet_buffer (first_b);
 838   ip6_header_t *ip = vlib_buffer_get_current (first_b);
 839   u16 ip6_frag_hdr_offset = first_b_vnb->ip.reass.ip6_frag_hdr_offset;
 840   ip6_ext_hdr_chain_t hdr_chain;
 841   ip6_ext_header_t *prev_hdr = 0;
 842   int res = ip6_ext_header_walk (first_b, ip, IP_PROTOCOL_IPV6_FRAGMENTATION,
 843                                  &hdr_chain);
 844   if (res < 0 ||
 845       (hdr_chain.eh[res].protocol != IP_PROTOCOL_IPV6_FRAGMENTATION))
 846     {
 847       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 848       goto free_buffers_and_return;
 849     }
 850   frag_hdr = ip6_ext_next_header_offset (ip, hdr_chain.eh[res].offset);
 851   if (res > 0)
 852     {
 853       prev_hdr = ip6_ext_next_header_offset (ip, hdr_chain.eh[res - 1].offset);
 854       prev_hdr->next_hdr = frag_hdr->next_hdr;
 855     }
 856   else
 857     {
 858       ip->protocol = frag_hdr->next_hdr;
 859     }
 860   if (hdr_chain.eh[res].offset != ip6_frag_hdr_offset)
 861     {
 862       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 863       goto free_buffers_and_return;
 864     }
 865   memmove (frag_hdr, (u8 *) frag_hdr + sizeof (*frag_hdr),
 866            first_b->current_length - ip6_frag_hdr_offset -
 867            sizeof (ip6_frag_hdr_t));
 868   first_b->current_length -= sizeof (*frag_hdr);
 869   ip->payload_length =
 870     clib_host_to_net_u16 (total_length + first_b->current_length -
 871                           sizeof (*ip));
 872   if (!vlib_buffer_chain_linearize (vm, first_b))
 873     {
 874       rv = IP6_FULL_REASS_RC_NO_BUF;
 875       goto free_buffers_and_return;
 876     }
 877   first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
 878   if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
 879     {
 880       ip6_full_reass_add_trace (vm, node, reass, reass->first_bi, NULL,
 881                                 FINALIZE, ~0);
 882 #if 0
 883       // following code does a hexdump of packet fragments to stdout ...
 884       do
 885         {
 886           u32 bi = reass->first_bi;
 887           u8 *s = NULL;
 888           while (~0 != bi)
 889             {
 890               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 891               s = format (s, "%u: %U\n", bi, format_hexdump,
 892                           vlib_buffer_get_current (b), b->current_length);
 893               if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 894                 {
 895                   bi = b->next_buffer;
 896                 }
 897               else
 898                 {
 899                   break;
 900                 }
 901             }
 902           printf ("%.*s\n", vec_len (s), s);
 903           fflush (stdout);
 904           vec_free (s);
 905         }
 906       while (0);
 907 #endif
 908     }
 909   if (!is_custom_app)
 910     {
 911       *next0 = IP6_FULL_REASSEMBLY_NEXT_INPUT;
 912     }
 913   else
 914     {
 915       *next0 = reass->next_index;
 916     }
 917   vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
 918   /* Keep track of number of successfully reassembled packets and number of
 919    * fragments reassembled */
 920   vlib_node_increment_counter (vm, node->node_index, IP6_ERROR_REASS_SUCCESS,
 921                                1);
 922
 923   vlib_node_increment_counter (vm, node->node_index,
 924                                IP6_ERROR_REASS_FRAGMENTS_REASSEMBLED,
 925                                reass->fragments_n);
 926
 927   ip6_full_reass_free (rm, rt, reass);
 928   reass = NULL;
 929 free_buffers_and_return:
 930   vlib_buffer_free (vm, vec_drop_compress, vec_len (vec_drop_compress));
 931   vec_free (vec_drop_compress);
 932   return rv;
 933 }
 934
 935 always_inline void
 936 ip6_full_reass_insert_range_in_chain (vlib_main_t * vm,
 937                                       ip6_full_reass_t * reass,
 938                                       u32 prev_range_bi, u32 new_next_bi)
 939 {
 940
 941   vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
 942   vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
 943   if (~0 != prev_range_bi)
 944     {
 945       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 946       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 947       new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
 948       prev_vnb->ip.reass.next_range_bi = new_next_bi;
 949     }
 950   else
 951     {
 952       if (~0 != reass->first_bi)
 953         {
 954           new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
 955         }
 956       reass->first_bi = new_next_bi;
 957     }
 958   reass->data_len += ip6_full_reass_buffer_get_data_len (new_next_b);
 959 }
 960
 961 always_inline ip6_full_reass_rc_t
 962 ip6_full_reass_update (vlib_main_t *vm, vlib_node_runtime_t *node,
 963                        ip6_full_reass_main_t *rm,
 964                        ip6_full_reass_per_thread_t *rt,
 965                        ip6_full_reass_t *reass, u32 *bi0, u32 *next0,
 966                        u32 *error0, ip6_frag_hdr_t *frag_hdr,
 967                        bool is_custom_app, u32 *handoff_thread_idx,
 968                        int skip_bihash)
 969 {
 970   int consumed = 0;
 971   vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
 972   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 973   if (is_custom_app)
 974     {
 975       reass->next_index = fvnb->ip.reass.next_index;    // store next_index before it's overwritten
 976       reass->error_next_index = fvnb->ip.reass.error_next_index;        // store error_next_index before it is overwritten
 977     }
 978
 979   fvnb->ip.reass.ip6_frag_hdr_offset =
 980     (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
 981   ip6_header_t *fip = vlib_buffer_get_current (fb);
 982   if (fb->current_length < sizeof (*fip) ||
 983       fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
 984       fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
 985     {
 986       return IP6_FULL_REASS_RC_INTERNAL_ERROR;
 987     }
 988
 989   u32 fragment_first = fvnb->ip.reass.fragment_first =
 990     ip6_frag_hdr_offset_bytes (frag_hdr);
 991   u32 fragment_length =
 992     vlib_buffer_length_in_chain (vm, fb) -
 993     (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 994   if (0 == fragment_length)
 995     {
 996       return IP6_FULL_REASS_RC_INVALID_FRAG_LEN;
 997     }
 998   u32 fragment_last = fvnb->ip.reass.fragment_last =
 999     fragment_first + fragment_length - 1;
1000   int more_fragments = ip6_frag_hdr_more (frag_hdr);
1001   u32 candidate_range_bi = reass->first_bi;
1002   u32 prev_range_bi = ~0;
1003   fvnb->ip.reass.range_first = fragment_first;
1004   fvnb->ip.reass.range_last = fragment_last;
1005   fvnb->ip.reass.next_range_bi = ~0;
1006   if (!more_fragments)
1007     {
1008       reass->last_packet_octet = fragment_last;
1009     }
1010   if (~0 == reass->first_bi)
1011     {
1012       // starting a new reassembly
1013       ip6_full_reass_insert_range_in_chain (vm, reass, prev_range_bi, *bi0);
1014       reass->min_fragment_length = clib_net_to_host_u16 (fip->payload_length);
1015       consumed = 1;
1016       reass->fragments_n = 1;
1017       goto check_if_done_maybe;
1018     }
1019   reass->min_fragment_length =
1020     clib_min (clib_net_to_host_u16 (fip->payload_length),
1021               fvnb->ip.reass.estimated_mtu);
1022   while (~0 != candidate_range_bi)
1023     {
1024       vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
1025       vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
1026       if (fragment_first > candidate_vnb->ip.reass.range_last)
1027         {
1028           // this fragments starts after candidate range
1029           prev_range_bi = candidate_range_bi;
1030           candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
1031           if (candidate_vnb->ip.reass.range_last < fragment_last &&
1032               ~0 == candidate_range_bi)
1033             {
1034               // special case - this fragment falls beyond all known ranges
1035               ip6_full_reass_insert_range_in_chain (vm, reass, prev_range_bi,
1036                                                     *bi0);
1037               consumed = 1;
1038               break;
1039             }
1040           continue;
1041         }
1042       if (fragment_last < candidate_vnb->ip.reass.range_first)
1043         {
1044           // this fragment ends before candidate range without any overlap
1045           ip6_full_reass_insert_range_in_chain (vm, reass, prev_range_bi,
1046                                                 *bi0);
1047           consumed = 1;
1048         }
1049       else if (fragment_first == candidate_vnb->ip.reass.range_first &&
1050                fragment_last == candidate_vnb->ip.reass.range_last)
1051         {
1052           // duplicate fragment - ignore
1053         }
1054       else
1055         {
1056           // overlapping fragment - not allowed by RFC 8200
1057           if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
1058             {
1059               ip6_full_reass_add_trace (vm, node, reass, *bi0, frag_hdr,
1060                                         RANGE_OVERLAP, ~0);
1061             }
1062           return IP6_FULL_REASS_RC_OVERLAP;
1063         }
1064       break;
1065     }
1066   ++reass->fragments_n;
1067 check_if_done_maybe:
1068   if (consumed)
1069     {
1070       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
1071         {
1072           ip6_full_reass_add_trace (vm, node, reass, *bi0, frag_hdr, RANGE_NEW,
1073                                     ~0);
1074         }
1075     }
1076   else if (skip_bihash)
1077     {
1078       // if this reassembly is not in bihash, then the packet must have been
1079       // consumed
1080       return IP6_FULL_REASS_RC_INTERNAL_ERROR;
1081     }
1082   if (~0 != reass->last_packet_octet &&
1083       reass->data_len == reass->last_packet_octet + 1)
1084     {
1085       *handoff_thread_idx = reass->sendout_thread_index;
1086       int handoff =
1087         reass->memory_owner_thread_index != reass->sendout_thread_index;
1088       ip6_full_reass_rc_t rc =
1089         ip6_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
1090                                  is_custom_app);
1091       if (IP6_FULL_REASS_RC_OK == rc && handoff)
1092         {
1093           return IP6_FULL_REASS_RC_HANDOFF;
1094         }
1095       return rc;
1096     }
1097   else
1098     {
1099       if (skip_bihash)
1100         {
1101           // if this reassembly is not in bihash, it should've been an atomic
1102           // fragment and thus finalized
1103           return IP6_FULL_REASS_RC_INTERNAL_ERROR;
1104         }
1105       if (consumed)
1106         {
1107           *bi0 = ~0;
1108           if (reass->fragments_n > rm->max_reass_len)
1109             {
1110               return IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS;
1111             }
1112         }
1113       else
1114         {
1115           *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1116           *error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT;
1117         }
1118     }
1119   return IP6_FULL_REASS_RC_OK;
1120 }
1121
1122 always_inline bool
1123 ip6_full_reass_verify_upper_layer_present (vlib_node_runtime_t *node,
1124                                            vlib_buffer_t *b,
1125                                            ip6_ext_hdr_chain_t *hc)
1126 {
1127   int nh = hc->eh[hc->length - 1].protocol;
1128   /* Checking to see if it's a terminating header */
1129   if (ip6_ext_hdr (nh))
1130     {
1131       icmp6_error_set_vnet_buffer (
1132         b, ICMP6_parameter_problem,
1133         ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain, 0);
1134       b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
1135       return false;
1136     }
1137   return true;
1138 }
1139
1140 always_inline bool
1141 ip6_full_reass_verify_fragment_multiple_8 (vlib_main_t *vm,
1142                                            vlib_node_runtime_t *node,
1143                                            vlib_buffer_t *b,
1144                                            ip6_frag_hdr_t *frag_hdr)
1145 {
1146   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1147   ip6_header_t *ip = vlib_buffer_get_current (b);
1148   int more_fragments = ip6_frag_hdr_more (frag_hdr);
1149   u32 fragment_length =
1150     vlib_buffer_length_in_chain (vm, b) -
1151     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
1152   if (more_fragments && 0 != fragment_length % 8)
1153     {
1154       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
1155                                    ICMP6_parameter_problem_erroneous_header_field,
1156                                    (u8 *) & ip->payload_length - (u8 *) ip);
1157       b->error = node->errors[IP6_ERROR_REASS_INVALID_FRAG_SIZE];
1158       return false;
1159     }
1160   return true;
1161 }
1162
1163 always_inline bool
1164 ip6_full_reass_verify_packet_size_lt_64k (vlib_main_t *vm,
1165                                           vlib_node_runtime_t *node,
1166                                           vlib_buffer_t *b,
1167                                           ip6_frag_hdr_t *frag_hdr)
1168 {
1169   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1170   u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
1171   u32 fragment_length =
1172     vlib_buffer_length_in_chain (vm, b) -
1173     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
1174   if (fragment_first + fragment_length > 65535)
1175     {
1176       ip6_header_t *ip0 = vlib_buffer_get_current (b);
1177       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
1178                                    ICMP6_parameter_problem_erroneous_header_field,
1179                                    (u8 *) & frag_hdr->fragment_offset_and_more
1180                                    - (u8 *) ip0);
1181       b->error = node->errors[IP6_ERROR_REASS_INVALID_FRAG_SIZE];
1182       return false;
1183     }
1184   return true;
1185 }
1186
1187 always_inline uword
1188 ip6_full_reassembly_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
1189                             vlib_frame_t *frame, bool is_feature,
1190                             bool is_custom_app, bool is_local)
1191 {
1192   u32 *from = vlib_frame_vector_args (frame);
1193   u32 n_left_from, n_left_to_next, *to_next, next_index;
1194   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1195   ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1196   clib_spinlock_lock (&rt->lock);
1197
1198   n_left_from = frame->n_vectors;
1199   next_index = node->cached_next_index;
1200   while (n_left_from > 0)
1201     {
1202       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1203
1204       while (n_left_from > 0 && n_left_to_next > 0)
1205         {
1206           u32 bi0;
1207           vlib_buffer_t *b0;
1208           u32 next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1209           u32 error0 = IP6_ERROR_NONE;
1210           u32 icmp_bi = ~0;
1211
1212           bi0 = from[0];
1213           b0 = vlib_get_buffer (vm, bi0);
1214
1215           ip6_header_t *ip0 = vlib_buffer_get_current (b0);
1216           ip6_frag_hdr_t *frag_hdr = NULL;
1217           ip6_ext_hdr_chain_t hdr_chain;
1218           vnet_buffer_opaque_t *fvnb = vnet_buffer (b0);
1219
1220           int res = ip6_ext_header_walk (
1221             b0, ip0, IP_PROTOCOL_IPV6_FRAGMENTATION, &hdr_chain);
1222           if (res < 0 ||
1223               hdr_chain.eh[res].protocol != IP_PROTOCOL_IPV6_FRAGMENTATION)
1224             {
1225               vlib_node_increment_counter (vm, node->node_index,
1226                                            IP6_ERROR_REASS_NO_FRAG_HDR, 1);
1227               // this is a mangled packet - no fragmentation
1228               next0 = is_custom_app ? fvnb->ip.reass.error_next_index :
1229                                             IP6_FULL_REASSEMBLY_NEXT_DROP;
1230               ip6_full_reass_add_trace (vm, node, NULL, bi0, NULL, PASSTHROUGH,
1231                                         ~0);
1232               goto skip_reass;
1233             }
1234           if (is_local && !rm->is_local_reass_enabled)
1235             {
1236               next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1237               goto skip_reass;
1238             }
1239
1240           /* Keep track of received fragments */
1241           vlib_node_increment_counter (vm, node->node_index,
1242                                        IP6_ERROR_REASS_FRAGMENTS_RCVD, 1);
1243           frag_hdr =
1244             ip6_ext_next_header_offset (ip0, hdr_chain.eh[res].offset);
1245           vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
1246             hdr_chain.eh[res].offset;
1247
1248           if (0 == ip6_frag_hdr_offset (frag_hdr))
1249             {
1250               // first fragment - verify upper-layer is present
1251               if (!ip6_full_reass_verify_upper_layer_present (node, b0,
1252                                                               &hdr_chain))
1253                 {
1254                   next0 = is_custom_app ? fvnb->ip.reass.error_next_index :
1255                                                 IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1256                   goto skip_reass;
1257                 }
1258             }
1259
1260           if (!ip6_full_reass_verify_fragment_multiple_8 (vm, node, b0,
1261                                                           frag_hdr) ||
1262               !ip6_full_reass_verify_packet_size_lt_64k (vm, node, b0,
1263                                                          frag_hdr))
1264             {
1265               next0 = is_custom_app ? fvnb->ip.reass.error_next_index :
1266                                             IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1267               goto skip_reass;
1268             }
1269
1270           int skip_bihash = 0;
1271           ip6_full_reass_kv_t kv;
1272           u8 do_handoff = 0;
1273
1274           if (0 == ip6_frag_hdr_offset (frag_hdr) &&
1275               !ip6_frag_hdr_more (frag_hdr))
1276             {
1277               // this is atomic fragment and needs to be processed separately
1278               skip_bihash = 1;
1279             }
1280           else
1281             {
1282               kv.k.as_u64[0] = ip0->src_address.as_u64[0];
1283               kv.k.as_u64[1] = ip0->src_address.as_u64[1];
1284               kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
1285               kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
1286               kv.k.as_u64[4] =
1287                 ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
1288                                 vnet_buffer (b0)->sw_if_index[VLIB_RX]))
1289                   << 32 |
1290                 (u64) frag_hdr->identification;
1291               /* RFC 8200: The Next Header values in the Fragment headers of
1292                * different fragments of the same original packet may differ.
1293                * Only the value from the Offset zero fragment packet is used
1294                * for reassembly.
1295                *
1296                * Also, IPv6 Header doesnt contain the protocol value unlike
1297                * IPv4.*/
1298               kv.k.as_u64[5] = 0;
1299             }
1300
1301           ip6_full_reass_t *reass = ip6_full_reass_find_or_create (
1302             vm, node, rm, rt, &kv, &icmp_bi, &do_handoff, skip_bihash,
1303             &n_left_to_next, &to_next);
1304
1305           if (reass)
1306             {
1307               const u32 fragment_first = ip6_frag_hdr_offset (frag_hdr);
1308               if (0 == fragment_first)
1309                 {
1310                   reass->sendout_thread_index = vm->thread_index;
1311                 }
1312             }
1313           if (PREDICT_FALSE (do_handoff))
1314             {
1315               next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
1316               vnet_buffer (b0)->ip.reass.owner_thread_index =
1317                 kv.v.memory_owner_thread_index;
1318             }
1319           else if (reass)
1320             {
1321               u32 handoff_thread_idx;
1322               u32 counter = ~0;
1323               switch (ip6_full_reass_update (
1324                 vm, node, rm, rt, reass, &bi0, &next0, &error0, frag_hdr,
1325                 is_custom_app, &handoff_thread_idx, skip_bihash))
1326                 {
1327                 case IP6_FULL_REASS_RC_OK:
1328                   /* nothing to do here */
1329                   break;
1330                 case IP6_FULL_REASS_RC_HANDOFF:
1331                   next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
1332                   b0 = vlib_get_buffer (vm, bi0);
1333                   vnet_buffer (b0)->ip.reass.owner_thread_index =
1334                     handoff_thread_idx;
1335                   break;
1336                 case IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS:
1337                   counter = IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG;
1338                   break;
1339                 case IP6_FULL_REASS_RC_NO_BUF:
1340                   counter = IP6_ERROR_REASS_NO_BUF;
1341                   break;
1342                 case IP6_FULL_REASS_RC_INVALID_FRAG_LEN:
1343                   counter = IP6_ERROR_REASS_INVALID_FRAG_LEN;
1344                   break;
1345                 case IP6_FULL_REASS_RC_OVERLAP:
1346                   counter = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT;
1347                   break;
1348                 case IP6_FULL_REASS_RC_INTERNAL_ERROR:
1349                   counter = IP6_ERROR_REASS_INTERNAL_ERROR;
1350                   /* Sanitization is needed in internal error cases only, as
1351                    * the incoming packet is already dropped in other cases,
1352                    * also adding bi0 back to the reassembly list, fixes the
1353                    * leaking of buffers during internal errors.
1354                    *
1355                    * Also it doesnt make sense to send these buffers custom
1356                    * app, these fragments are with internal errors */
1357                   sanitize_reass_buffers_add_missing (vm, reass, &bi0);
1358                   reass->error_next_index = ~0;
1359                   break;
1360                 }
1361               if (~0 != counter)
1362                 {
1363                   vlib_node_increment_counter (vm, node->node_index, counter,
1364                                                1);
1365                   ip6_full_reass_drop_all (vm, node, reass, &n_left_to_next,
1366                                            &to_next);
1367                   ip6_full_reass_free (rm, rt, reass);
1368                   goto next_packet;
1369                   break;
1370                 }
1371             }
1372           else
1373             {
1374               if (is_feature)
1375                 {
1376                   next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1377                 }
1378               else
1379                 {
1380                   next0 = fvnb->ip.reass.error_next_index;
1381                 }
1382               error0 = IP6_ERROR_REASS_LIMIT_REACHED;
1383             }
1384
1385           if (~0 != bi0)
1386             {
1387             skip_reass:
1388               to_next[0] = bi0;
1389               to_next += 1;
1390               n_left_to_next -= 1;
1391
1392               /* bi0 might have been updated by reass_finalize, reload */
1393               b0 = vlib_get_buffer (vm, bi0);
1394               if (IP6_ERROR_NONE != error0)
1395                 {
1396                   b0->error = node->errors[error0];
1397                 }
1398
1399               if (next0 == IP6_FULL_REASSEMBLY_NEXT_HANDOFF)
1400                 {
1401                   if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1402                     {
1403                       ip6_full_reass_add_trace (
1404                         vm, node, NULL, bi0, frag_hdr, HANDOFF,
1405                         vnet_buffer (b0)->ip.reass.owner_thread_index);
1406                     }
1407                 }
1408               else if (is_feature && IP6_ERROR_NONE == error0)
1409                 {
1410                   vnet_feature_next (&next0, b0);
1411                 }
1412
1413               /* Increment the counter to-custom-app also as this fragment is
1414                * also going to application */
1415               if (is_custom_app)
1416                 {
1417                   vlib_node_increment_counter (
1418                     vm, node->node_index, IP6_ERROR_REASS_TO_CUSTOM_APP, 1);
1419                 }
1420
1421               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1422                                                n_left_to_next, bi0, next0);
1423             }
1424
1425           if (~0 != icmp_bi)
1426             {
1427               next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1428               to_next[0] = icmp_bi;
1429               to_next += 1;
1430               n_left_to_next -= 1;
1431               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1432                                                n_left_to_next, icmp_bi,
1433                                                next0);
1434             }
1435         next_packet:
1436           from += 1;
1437           n_left_from -= 1;
1438         }
1439
1440       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1441     }
1442
1443   clib_spinlock_unlock (&rt->lock);
1444   return frame->n_vectors;
1445 }
1446
1447 VLIB_NODE_FN (ip6_full_reass_node) (vlib_main_t * vm,
1448                                     vlib_node_runtime_t * node,
1449                                     vlib_frame_t * frame)
1450 {
1451   return ip6_full_reassembly_inline (vm, node, frame, false /* is_feature */,
1452                                      false /* is_custom_app */,
1453                                      false /* is_local */);
1454 }
1455
1456 VLIB_REGISTER_NODE (ip6_full_reass_node) = {
1457     .name = "ip6-full-reassembly",
1458     .vector_size = sizeof (u32),
1459     .format_trace = format_ip6_full_reass_trace,
1460     .n_errors = IP6_N_ERROR,
1461     .error_counters = ip6_error_counters,
1462     .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1463     .next_nodes =
1464         {
1465                 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1466                 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1467                 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1468                 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reassembly-handoff",
1469         },
1470 };
1471
1472 VLIB_NODE_FN (ip6_local_full_reass_node)
1473 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
1474 {
1475   return ip6_full_reassembly_inline (vm, node, frame, false /* is_feature */,
1476                                      false /* is_custom_app */,
1477                                      true /* is_local */);
1478 }
1479
1480 VLIB_REGISTER_NODE (ip6_local_full_reass_node) = {
1481     .name = "ip6-local-full-reassembly",
1482     .vector_size = sizeof (u32),
1483     .format_trace = format_ip6_full_reass_trace,
1484     .n_errors = IP6_N_ERROR,
1485     .error_counters = ip6_error_counters,
1486     .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1487     .next_nodes =
1488         {
1489                 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1490                 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1491                 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1492                 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-local-full-reassembly-handoff",
1493         },
1494 };
1495
1496 VLIB_NODE_FN (ip6_full_reass_node_feature) (vlib_main_t * vm,
1497                                             vlib_node_runtime_t * node,
1498                                             vlib_frame_t * frame)
1499 {
1500   return ip6_full_reassembly_inline (vm, node, frame, true /* is_feature */,
1501                                      false /* is_custom_app */,
1502                                      false /* is_local */);
1503 }
1504
1505 VLIB_REGISTER_NODE (ip6_full_reass_node_feature) = {
1506     .name = "ip6-full-reassembly-feature",
1507     .vector_size = sizeof (u32),
1508     .format_trace = format_ip6_full_reass_trace,
1509     .n_errors = IP6_N_ERROR,
1510     .error_counters = ip6_error_counters,
1511     .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1512     .next_nodes =
1513         {
1514                 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1515                 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1516                 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1517                 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reass-feature-hoff",
1518         },
1519 };
1520
1521 VNET_FEATURE_INIT (ip6_full_reassembly_feature, static) = {
1522     .arc_name = "ip6-unicast",
1523     .node_name = "ip6-full-reassembly-feature",
1524     .runs_before = VNET_FEATURES ("ip6-lookup",
1525                                   "ipsec6-input-feature"),
1526     .runs_after = 0,
1527 };
1528
1529 VLIB_NODE_FN (ip6_full_reass_node_custom)
1530 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
1531 {
1532   return ip6_full_reassembly_inline (vm, node, frame, false /* is_feature */,
1533                                      true /* is_custom_app */,
1534                                      false /* is_local */);
1535 }
1536
1537 VLIB_REGISTER_NODE (ip6_full_reass_node_custom) = {
1538     .name = "ip6-full-reassembly-custom",
1539     .vector_size = sizeof (u32),
1540     .format_trace = format_ip6_full_reass_trace,
1541     .n_errors = IP6_N_ERROR,
1542     .error_counters = ip6_error_counters,
1543     .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1544     .next_nodes =
1545         {
1546                 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1547                 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1548                 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1549                 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reass-custom-hoff",
1550         },
1551 };
1552
1553 #ifndef CLIB_MARCH_VARIANT
1554 static u32
1555 ip6_full_reass_get_nbuckets ()
1556 {
1557   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1558   u32 nbuckets;
1559   u8 i;
1560
1561   /* need more mem with more workers */
1562   nbuckets = (u32) (rm->max_reass_n * (vlib_num_workers () + 1) /
1563                     IP6_FULL_REASS_HT_LOAD_FACTOR);
1564
1565   for (i = 0; i < 31; i++)
1566     if ((1 << i) >= nbuckets)
1567       break;
1568   nbuckets = 1 << i;
1569
1570   return nbuckets;
1571 }
1572 #endif /* CLIB_MARCH_VARIANT */
1573
1574 typedef enum
1575 {
1576   IP6_EVENT_CONFIG_CHANGED = 1,
1577 } ip6_full_reass_event_t;
1578
1579 #ifndef CLIB_MARCH_VARIANT
1580 typedef struct
1581 {
1582   int failure;
1583   clib_bihash_48_8_t *new_hash;
1584 } ip6_rehash_cb_ctx;
1585
1586 static int
1587 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
1588 {
1589   ip6_rehash_cb_ctx *ctx = _ctx;
1590   if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
1591     {
1592       ctx->failure = 1;
1593     }
1594   return (BIHASH_WALK_CONTINUE);
1595 }
1596
1597 static void
1598 ip6_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1599                            u32 max_reassembly_length,
1600                            u32 expire_walk_interval_ms)
1601 {
1602   ip6_full_reass_main.timeout_ms = timeout_ms;
1603   ip6_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1604   ip6_full_reass_main.max_reass_n = max_reassemblies;
1605   ip6_full_reass_main.max_reass_len = max_reassembly_length;
1606   ip6_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1607 }
1608
1609 vnet_api_error_t
1610 ip6_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
1611                     u32 max_reassembly_length, u32 expire_walk_interval_ms)
1612 {
1613   u32 old_nbuckets = ip6_full_reass_get_nbuckets ();
1614   ip6_full_reass_set_params (timeout_ms, max_reassemblies,
1615                              max_reassembly_length, expire_walk_interval_ms);
1616   vlib_process_signal_event (ip6_full_reass_main.vlib_main,
1617                              ip6_full_reass_main.ip6_full_reass_expire_node_idx,
1618                              IP6_EVENT_CONFIG_CHANGED, 0);
1619   u32 new_nbuckets = ip6_full_reass_get_nbuckets ();
1620   if (ip6_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1621     {
1622       clib_bihash_48_8_t new_hash;
1623       clib_memset (&new_hash, 0, sizeof (new_hash));
1624       ip6_rehash_cb_ctx ctx;
1625       ctx.failure = 0;
1626       ctx.new_hash = &new_hash;
1627       clib_bihash_init_48_8 (&new_hash, "ip6-full-reass", new_nbuckets,
1628                              new_nbuckets * 1024);
1629       clib_bihash_foreach_key_value_pair_48_8 (&ip6_full_reass_main.hash,
1630                                                ip6_rehash_cb, &ctx);
1631       if (ctx.failure)
1632         {
1633           clib_bihash_free_48_8 (&new_hash);
1634           return -1;
1635         }
1636       else
1637         {
1638           clib_bihash_free_48_8 (&ip6_full_reass_main.hash);
1639           clib_memcpy_fast (&ip6_full_reass_main.hash, &new_hash,
1640                             sizeof (ip6_full_reass_main.hash));
1641           clib_bihash_copied (&ip6_full_reass_main.hash, &new_hash);
1642         }
1643     }
1644   return 0;
1645 }
1646
1647 vnet_api_error_t
1648 ip6_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1649                     u32 * max_reassembly_length,
1650                     u32 * expire_walk_interval_ms)
1651 {
1652   *timeout_ms = ip6_full_reass_main.timeout_ms;
1653   *max_reassemblies = ip6_full_reass_main.max_reass_n;
1654   *max_reassembly_length = ip6_full_reass_main.max_reass_len;
1655   *expire_walk_interval_ms = ip6_full_reass_main.expire_walk_interval_ms;
1656   return 0;
1657 }
1658
1659 static clib_error_t *
1660 ip6_full_reass_init_function (vlib_main_t * vm)
1661 {
1662   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1663   clib_error_t *error = 0;
1664   u32 nbuckets;
1665   vlib_node_t *node;
1666
1667   rm->vlib_main = vm;
1668
1669   vec_validate (rm->per_thread_data, vlib_num_workers ());
1670   ip6_full_reass_per_thread_t *rt;
1671   vec_foreach (rt, rm->per_thread_data)
1672   {
1673     clib_spinlock_init (&rt->lock);
1674     pool_alloc (rt->pool, rm->max_reass_n);
1675   }
1676
1677   node = vlib_get_node_by_name (vm, (u8 *) "ip6-full-reassembly-expire-walk");
1678   ASSERT (node);
1679   rm->ip6_full_reass_expire_node_idx = node->index;
1680
1681   ip6_full_reass_set_params (IP6_FULL_REASS_TIMEOUT_DEFAULT_MS,
1682                              IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT,
1683                              IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1684                              IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1685
1686   nbuckets = ip6_full_reass_get_nbuckets ();
1687   clib_bihash_init_48_8 (&rm->hash, "ip6-full-reass", nbuckets,
1688                          nbuckets * 1024);
1689
1690   node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
1691   ASSERT (node);
1692   rm->ip6_icmp_error_idx = node->index;
1693
1694   if ((error = vlib_call_init_function (vm, ip_main_init)))
1695     return error;
1696   ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
1697                          ip6_local_full_reass_node.index);
1698   rm->is_local_reass_enabled = 1;
1699
1700   rm->fq_index = vlib_frame_queue_main_init (ip6_full_reass_node.index, 0);
1701   rm->fq_local_index =
1702     vlib_frame_queue_main_init (ip6_local_full_reass_node.index, 0);
1703   rm->fq_feature_index =
1704     vlib_frame_queue_main_init (ip6_full_reass_node_feature.index, 0);
1705   rm->fq_custom_index =
1706     vlib_frame_queue_main_init (ip6_full_reass_node_custom.index, 0);
1707
1708   rm->feature_use_refcount_per_intf = NULL;
1709   return error;
1710 }
1711
1712 VLIB_INIT_FUNCTION (ip6_full_reass_init_function);
1713 #endif /* CLIB_MARCH_VARIANT */
1714
1715 static uword
1716 ip6_full_reass_walk_expired (vlib_main_t *vm, vlib_node_runtime_t *node,
1717                              CLIB_UNUSED (vlib_frame_t *f))
1718 {
1719   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1720   uword event_type, *event_data = 0;
1721
1722   while (true)
1723     {
1724       vlib_process_wait_for_event_or_clock (vm,
1725                                             (f64) rm->expire_walk_interval_ms
1726                                             / (f64) MSEC_PER_SEC);
1727       event_type = vlib_process_get_events (vm, &event_data);
1728
1729       switch (event_type)
1730         {
1731         case ~0:
1732           /* no events => timeout */
1733           /* fallthrough */
1734         case IP6_EVENT_CONFIG_CHANGED:
1735           /* nothing to do here */
1736           break;
1737         default:
1738           clib_warning ("BUG: event type 0x%wx", event_type);
1739           break;
1740         }
1741       f64 now = vlib_time_now (vm);
1742
1743       ip6_full_reass_t *reass;
1744       int *pool_indexes_to_free = NULL;
1745
1746       uword thread_index = 0;
1747       int index;
1748       const uword nthreads = vlib_num_workers () + 1;
1749       u32 *vec_icmp_bi = NULL;
1750       u32 n_left_to_next, *to_next;
1751
1752       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1753         {
1754           ip6_full_reass_per_thread_t *rt =
1755             &rm->per_thread_data[thread_index];
1756           u32 reass_timeout_cnt = 0;
1757           clib_spinlock_lock (&rt->lock);
1758
1759           vec_reset_length (pool_indexes_to_free);
1760           /* Pace the number of timeouts handled per thread,to avoid barrier
1761            * sync issues in real world scenarios */
1762
1763           u32 beg = rt->last_id;
1764           /* to ensure we walk at least once per sec per context */
1765           u32 end = beg + (IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT *
1766                              IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS /
1767                              MSEC_PER_SEC +
1768                            1);
1769           if (end > vec_len (rt->pool))
1770             {
1771               end = vec_len (rt->pool);
1772               rt->last_id = 0;
1773             }
1774           else
1775             {
1776               rt->last_id = end;
1777             }
1778
1779           pool_foreach_stepping_index (index, beg, end, rt->pool)
1780           {
1781             reass = pool_elt_at_index (rt->pool, index);
1782             if (now > reass->last_heard + rm->timeout)
1783               {
1784                 vec_add1 (pool_indexes_to_free, index);
1785               }
1786           }
1787
1788           int *i;
1789           vec_foreach (i, pool_indexes_to_free)
1790           {
1791             ip6_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1792             u32 icmp_bi = ~0;
1793
1794             reass_timeout_cnt += reass->fragments_n;
1795             ip6_full_reass_on_timeout (vm, node, reass, &icmp_bi,
1796                                        &n_left_to_next, &to_next);
1797             if (~0 != icmp_bi)
1798               vec_add1 (vec_icmp_bi, icmp_bi);
1799
1800             ip6_full_reass_free (rm, rt, reass);
1801           }
1802
1803           clib_spinlock_unlock (&rt->lock);
1804           if (reass_timeout_cnt)
1805             vlib_node_increment_counter (vm, node->node_index,
1806                                          IP6_ERROR_REASS_TIMEOUT,
1807                                          reass_timeout_cnt);
1808         }
1809
1810       while (vec_len (vec_icmp_bi) > 0)
1811         {
1812           vlib_frame_t *f =
1813             vlib_get_frame_to_node (vm, rm->ip6_icmp_error_idx);
1814           u32 *to_next = vlib_frame_vector_args (f);
1815           u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
1816           int trace_frame = 0;
1817           while (vec_len (vec_icmp_bi) > 0 && n_left_to_next > 0)
1818             {
1819               u32 bi = vec_pop (vec_icmp_bi);
1820               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1821               if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1822                 trace_frame = 1;
1823               to_next[0] = bi;
1824               ++f->n_vectors;
1825               to_next += 1;
1826               n_left_to_next -= 1;
1827             }
1828           f->frame_flags |= (trace_frame * VLIB_FRAME_TRACE);
1829           vlib_put_frame_to_node (vm, rm->ip6_icmp_error_idx, f);
1830         }
1831
1832       vec_free (pool_indexes_to_free);
1833       vec_free (vec_icmp_bi);
1834       if (event_data)
1835         {
1836           vec_set_len (event_data, 0);
1837         }
1838     }
1839
1840   return 0;
1841 }
1842
1843 VLIB_REGISTER_NODE (ip6_full_reass_expire_node) = {
1844   .function = ip6_full_reass_walk_expired,
1845   .format_trace = format_ip6_full_reass_trace,
1846   .type = VLIB_NODE_TYPE_PROCESS,
1847   .name = "ip6-full-reassembly-expire-walk",
1848
1849   .n_errors = IP6_N_ERROR,
1850   .error_counters = ip6_error_counters,
1851 };
1852
1853 static u8 *
1854 format_ip6_full_reass_key (u8 * s, va_list * args)
1855 {
1856   ip6_full_reass_key_t *key = va_arg (*args, ip6_full_reass_key_t *);
1857   s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1858               key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1859               &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1860   return s;
1861 }
1862
1863 static u8 *
1864 format_ip6_full_reass (u8 * s, va_list * args)
1865 {
1866   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1867   ip6_full_reass_t *reass = va_arg (*args, ip6_full_reass_t *);
1868
1869   s = format (s, "ID: %lu, key: %U\n  first_bi: %u, data_len: %u, "
1870               "last_packet_octet: %u, trace_op_counter: %u\n",
1871               reass->id, format_ip6_full_reass_key, &reass->key,
1872               reass->first_bi, reass->data_len, reass->last_packet_octet,
1873               reass->trace_op_counter);
1874   u32 bi = reass->first_bi;
1875   u32 counter = 0;
1876   while (~0 != bi)
1877     {
1878       vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1879       vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1880       s = format (s, "  #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1881                   "fragment[%u, %u]\n",
1882                   counter, vnb->ip.reass.range_first,
1883                   vnb->ip.reass.range_last, bi,
1884                   ip6_full_reass_buffer_get_data_offset (b),
1885                   ip6_full_reass_buffer_get_data_len (b),
1886                   vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1887       if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1888         {
1889           bi = b->next_buffer;
1890         }
1891       else
1892         {
1893           bi = ~0;
1894         }
1895     }
1896   return s;
1897 }
1898
1899 static clib_error_t *
1900 show_ip6_full_reass (vlib_main_t * vm, unformat_input_t * input,
1901                      CLIB_UNUSED (vlib_cli_command_t * lmd))
1902 {
1903   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1904
1905   vlib_cli_output (vm, "---------------------");
1906   vlib_cli_output (vm, "IP6 reassembly status");
1907   vlib_cli_output (vm, "---------------------");
1908   bool details = false;
1909   if (unformat (input, "details"))
1910     {
1911       details = true;
1912     }
1913
1914   u32 sum_reass_n = 0;
1915   u64 sum_buffers_n = 0;
1916   ip6_full_reass_t *reass;
1917   uword thread_index;
1918   const uword nthreads = vlib_num_workers () + 1;
1919   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1920     {
1921       ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1922       clib_spinlock_lock (&rt->lock);
1923       if (details)
1924         {
1925           pool_foreach (reass, rt->pool) {
1926             vlib_cli_output (vm, "%U", format_ip6_full_reass, vm, reass);
1927           }
1928         }
1929       sum_reass_n += rt->reass_n;
1930       clib_spinlock_unlock (&rt->lock);
1931     }
1932   vlib_cli_output (vm, "---------------------");
1933   vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1934                    (long unsigned) sum_reass_n);
1935   vlib_cli_output (vm,
1936                    "Maximum configured concurrent full IP6 reassemblies per worker-thread: %lu\n",
1937                    (long unsigned) rm->max_reass_n);
1938   vlib_cli_output (vm,
1939                    "Maximum configured amount of fragments "
1940                    "per full IP6 reassembly: %lu\n",
1941                    (long unsigned) rm->max_reass_len);
1942   vlib_cli_output (vm,
1943                    "Maximum configured full IP6 reassembly timeout: %lums\n",
1944                    (long unsigned) rm->timeout_ms);
1945   vlib_cli_output (vm,
1946                    "Maximum configured full IP6 reassembly expire walk interval: %lums\n",
1947                    (long unsigned) rm->expire_walk_interval_ms);
1948   vlib_cli_output (vm, "Buffers in use: %lu\n",
1949                    (long unsigned) sum_buffers_n);
1950   return 0;
1951 }
1952
1953 VLIB_CLI_COMMAND (show_ip6_full_reassembly_cmd, static) = {
1954     .path = "show ip6-full-reassembly",
1955     .short_help = "show ip6-full-reassembly [details]",
1956     .function = show_ip6_full_reass,
1957 };
1958
1959 #ifndef CLIB_MARCH_VARIANT
1960 vnet_api_error_t
1961 ip6_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1962 {
1963   return vnet_feature_enable_disable ("ip6-unicast",
1964                                       "ip6-full-reassembly-feature",
1965                                       sw_if_index, enable_disable, 0, 0);
1966 }
1967 #endif /* CLIB_MARCH_VARIANT */
1968
1969 #define foreach_ip6_full_reassembly_handoff_error                       \
1970 _(CONGESTION_DROP, "congestion drop")
1971
1972
1973 typedef enum
1974 {
1975 #define _(sym,str) IP6_FULL_REASSEMBLY_HANDOFF_ERROR_##sym,
1976   foreach_ip6_full_reassembly_handoff_error
1977 #undef _
1978     IP6_FULL_REASSEMBLY_HANDOFF_N_ERROR,
1979 } ip6_full_reassembly_handoff_error_t;
1980
1981 static char *ip6_full_reassembly_handoff_error_strings[] = {
1982 #define _(sym,string) string,
1983   foreach_ip6_full_reassembly_handoff_error
1984 #undef _
1985 };
1986
1987 typedef struct
1988 {
1989   u32 next_worker_index;
1990 } ip6_full_reassembly_handoff_trace_t;
1991
1992 static u8 *
1993 format_ip6_full_reassembly_handoff_trace (u8 * s, va_list * args)
1994 {
1995   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1996   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1997   ip6_full_reassembly_handoff_trace_t *t =
1998     va_arg (*args, ip6_full_reassembly_handoff_trace_t *);
1999
2000   s =
2001     format (s, "ip6-full-reassembly-handoff: next-worker %d",
2002             t->next_worker_index);
2003
2004   return s;
2005 }
2006
2007 always_inline uword
2008 ip6_full_reassembly_handoff_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
2009                                     vlib_frame_t *frame,
2010                                     ip6_full_reass_node_type_t type,
2011                                     bool is_local)
2012 {
2013   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
2014
2015   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2016   u32 n_enq, n_left_from, *from;
2017   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
2018   u32 fq_index;
2019
2020   from = vlib_frame_vector_args (frame);
2021   n_left_from = frame->n_vectors;
2022   vlib_get_buffers (vm, from, bufs, n_left_from);
2023
2024   b = bufs;
2025   ti = thread_indices;
2026
2027   switch (type)
2028     {
2029     case NORMAL:
2030       if (is_local)
2031         {
2032           fq_index = rm->fq_local_index;
2033         }
2034       else
2035         {
2036           fq_index = rm->fq_index;
2037         }
2038       break;
2039     case FEATURE:
2040       fq_index = rm->fq_feature_index;
2041       break;
2042     case CUSTOM:
2043       fq_index = rm->fq_custom_index;
2044       break;
2045     default:
2046       clib_warning ("Unexpected `type' (%d)!", type);
2047       ASSERT (0);
2048     }
2049   while (n_left_from > 0)
2050     {
2051       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
2052
2053       if (PREDICT_FALSE
2054           ((node->flags & VLIB_NODE_FLAG_TRACE)
2055            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
2056         {
2057           ip6_full_reassembly_handoff_trace_t *t =
2058             vlib_add_trace (vm, node, b[0], sizeof (*t));
2059           t->next_worker_index = ti[0];
2060         }
2061
2062       n_left_from -= 1;
2063       ti += 1;
2064       b += 1;
2065     }
2066   n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from,
2067                                          thread_indices, frame->n_vectors, 1);
2068
2069   if (n_enq < frame->n_vectors)
2070     vlib_node_increment_counter (vm, node->node_index,
2071                                  IP6_FULL_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
2072                                  frame->n_vectors - n_enq);
2073   return frame->n_vectors;
2074 }
2075
2076 VLIB_NODE_FN (ip6_full_reassembly_handoff_node) (vlib_main_t * vm,
2077                                                  vlib_node_runtime_t * node,
2078                                                  vlib_frame_t * frame)
2079 {
2080   return ip6_full_reassembly_handoff_inline (vm, node, frame, NORMAL,
2081                                              false /* is_local */);
2082 }
2083
2084 VLIB_REGISTER_NODE (ip6_full_reassembly_handoff_node) = {
2085   .name = "ip6-full-reassembly-handoff",
2086   .vector_size = sizeof (u32),
2087   .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
2088   .error_strings = ip6_full_reassembly_handoff_error_strings,
2089   .format_trace = format_ip6_full_reassembly_handoff_trace,
2090
2091   .n_next_nodes = 1,
2092
2093   .next_nodes = {
2094     [0] = "error-drop",
2095   },
2096 };
2097
2098 VLIB_NODE_FN (ip6_local_full_reassembly_handoff_node)
2099 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
2100 {
2101   return ip6_full_reassembly_handoff_inline (vm, node, frame, NORMAL,
2102                                              true /* is_feature */);
2103 }
2104
2105 VLIB_REGISTER_NODE (ip6_local_full_reassembly_handoff_node) = {
2106   .name = "ip6-local-full-reassembly-handoff",
2107   .vector_size = sizeof (u32),
2108   .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
2109   .error_strings = ip6_full_reassembly_handoff_error_strings,
2110   .format_trace = format_ip6_full_reassembly_handoff_trace,
2111
2112   .n_next_nodes = 1,
2113
2114   .next_nodes = {
2115     [0] = "error-drop",
2116   },
2117 };
2118
2119 VLIB_NODE_FN (ip6_full_reassembly_feature_handoff_node) (vlib_main_t * vm,
2120                                vlib_node_runtime_t * node, vlib_frame_t * frame)
2121 {
2122   return ip6_full_reassembly_handoff_inline (vm, node, frame, FEATURE,
2123                                              false /* is_local */);
2124 }
2125
2126 VLIB_REGISTER_NODE (ip6_full_reassembly_feature_handoff_node) = {
2127   .name = "ip6-full-reass-feature-hoff",
2128   .vector_size = sizeof (u32),
2129   .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
2130   .error_strings = ip6_full_reassembly_handoff_error_strings,
2131   .format_trace = format_ip6_full_reassembly_handoff_trace,
2132
2133   .n_next_nodes = 1,
2134
2135   .next_nodes = {
2136     [0] = "error-drop",
2137   },
2138 };
2139
2140 VLIB_NODE_FN (ip6_full_reassembly_custom_handoff_node)
2141 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
2142 {
2143   return ip6_full_reassembly_handoff_inline (vm, node, frame, CUSTOM,
2144                                              false /* is_local */);
2145 }
2146
2147 VLIB_REGISTER_NODE (ip6_full_reassembly_custom_handoff_node) = {
2148   .name = "ip6-full-reass-custom-hoff",
2149   .vector_size = sizeof (u32),
2150   .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
2151   .error_strings = ip6_full_reassembly_handoff_error_strings,
2152   .format_trace = format_ip6_full_reassembly_handoff_trace,
2153
2154   .n_next_nodes = 1,
2155
2156   .next_nodes = {
2157     [0] = "error-drop",
2158   },
2159 };
2160
2161 #ifndef CLIB_MARCH_VARIANT
2162 int
2163 ip6_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
2164 {
2165   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
2166   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
2167   if (is_enable)
2168     {
2169       if (!rm->feature_use_refcount_per_intf[sw_if_index])
2170         {
2171           ++rm->feature_use_refcount_per_intf[sw_if_index];
2172           return vnet_feature_enable_disable ("ip6-unicast",
2173                                               "ip6-full-reassembly-feature",
2174                                               sw_if_index, 1, 0, 0);
2175         }
2176       ++rm->feature_use_refcount_per_intf[sw_if_index];
2177     }
2178   else
2179     {
2180       --rm->feature_use_refcount_per_intf[sw_if_index];
2181       if (!rm->feature_use_refcount_per_intf[sw_if_index])
2182         return vnet_feature_enable_disable ("ip6-unicast",
2183                                             "ip6-full-reassembly-feature",
2184                                             sw_if_index, 0, 0, 0);
2185     }
2186   return -1;
2187 }
2188
2189 void
2190 ip6_local_full_reass_enable_disable (int enable)
2191 {
2192   if (enable)
2193     {
2194       if (!ip6_full_reass_main.is_local_reass_enabled)
2195         {
2196           ip6_full_reass_main.is_local_reass_enabled = 1;
2197           ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
2198                                  ip6_local_full_reass_node.index);
2199         }
2200     }
2201   else
2202     {
2203       if (ip6_full_reass_main.is_local_reass_enabled)
2204         {
2205           ip6_full_reass_main.is_local_reass_enabled = 0;
2206           ip6_unregister_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION);
2207         }
2208     }
2209 }
2210
2211 int
2212 ip6_local_full_reass_enabled ()
2213 {
2214   return ip6_full_reass_main.is_local_reass_enabled;
2215 }
2216
2217 #endif
2218
2219 /*
2220  * fd.io coding-style-patch-verification: ON
2221  *
2222  * Local Variables:
2223  * eval: (c-set-style "gnu")
2224  * End:
2225  */