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               u32 fib_index =
1283                 (vnet_buffer (b0)->sw_if_index[VLIB_TX] == (u32) ~0) ?
1284                         vec_elt (ip6_main.fib_index_by_sw_if_index,
1285                            vnet_buffer (b0)->sw_if_index[VLIB_RX]) :
1286                         vnet_buffer (b0)->sw_if_index[VLIB_TX];
1287               kv.k.as_u64[0] = ip0->src_address.as_u64[0];
1288               kv.k.as_u64[1] = ip0->src_address.as_u64[1];
1289               kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
1290               kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
1291               kv.k.as_u64[4] =
1292                 ((u64) fib_index) << 32 | (u64) frag_hdr->identification;
1293               /* RFC 8200: The Next Header values in the Fragment headers of
1294                * different fragments of the same original packet may differ.
1295                * Only the value from the Offset zero fragment packet is used
1296                * for reassembly.
1297                *
1298                * Also, IPv6 Header doesnt contain the protocol value unlike
1299                * IPv4.*/
1300               kv.k.as_u64[5] = 0;
1301             }
1302
1303           ip6_full_reass_t *reass = ip6_full_reass_find_or_create (
1304             vm, node, rm, rt, &kv, &icmp_bi, &do_handoff, skip_bihash,
1305             &n_left_to_next, &to_next);
1306
1307           if (reass)
1308             {
1309               const u32 fragment_first = ip6_frag_hdr_offset (frag_hdr);
1310               if (0 == fragment_first)
1311                 {
1312                   reass->sendout_thread_index = vm->thread_index;
1313                 }
1314             }
1315           if (PREDICT_FALSE (do_handoff))
1316             {
1317               next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
1318               vnet_buffer (b0)->ip.reass.owner_thread_index =
1319                 kv.v.memory_owner_thread_index;
1320             }
1321           else if (reass)
1322             {
1323               u32 handoff_thread_idx;
1324               u32 counter = ~0;
1325               switch (ip6_full_reass_update (
1326                 vm, node, rm, rt, reass, &bi0, &next0, &error0, frag_hdr,
1327                 is_custom_app, &handoff_thread_idx, skip_bihash))
1328                 {
1329                 case IP6_FULL_REASS_RC_OK:
1330                   /* nothing to do here */
1331                   break;
1332                 case IP6_FULL_REASS_RC_HANDOFF:
1333                   next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
1334                   b0 = vlib_get_buffer (vm, bi0);
1335                   vnet_buffer (b0)->ip.reass.owner_thread_index =
1336                     handoff_thread_idx;
1337                   break;
1338                 case IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS:
1339                   counter = IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG;
1340                   break;
1341                 case IP6_FULL_REASS_RC_NO_BUF:
1342                   counter = IP6_ERROR_REASS_NO_BUF;
1343                   break;
1344                 case IP6_FULL_REASS_RC_INVALID_FRAG_LEN:
1345                   counter = IP6_ERROR_REASS_INVALID_FRAG_LEN;
1346                   break;
1347                 case IP6_FULL_REASS_RC_OVERLAP:
1348                   counter = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT;
1349                   break;
1350                 case IP6_FULL_REASS_RC_INTERNAL_ERROR:
1351                   counter = IP6_ERROR_REASS_INTERNAL_ERROR;
1352                   /* Sanitization is needed in internal error cases only, as
1353                    * the incoming packet is already dropped in other cases,
1354                    * also adding bi0 back to the reassembly list, fixes the
1355                    * leaking of buffers during internal errors.
1356                    *
1357                    * Also it doesnt make sense to send these buffers custom
1358                    * app, these fragments are with internal errors */
1359                   sanitize_reass_buffers_add_missing (vm, reass, &bi0);
1360                   reass->error_next_index = ~0;
1361                   break;
1362                 }
1363               if (~0 != counter)
1364                 {
1365                   vlib_node_increment_counter (vm, node->node_index, counter,
1366                                                1);
1367                   ip6_full_reass_drop_all (vm, node, reass, &n_left_to_next,
1368                                            &to_next);
1369                   ip6_full_reass_free (rm, rt, reass);
1370                   goto next_packet;
1371                   break;
1372                 }
1373             }
1374           else
1375             {
1376               if (is_feature)
1377                 {
1378                   next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1379                 }
1380               else
1381                 {
1382                   next0 = fvnb->ip.reass.error_next_index;
1383                 }
1384               error0 = IP6_ERROR_REASS_LIMIT_REACHED;
1385             }
1386
1387           if (~0 != bi0)
1388             {
1389             skip_reass:
1390               to_next[0] = bi0;
1391               to_next += 1;
1392               n_left_to_next -= 1;
1393
1394               /* bi0 might have been updated by reass_finalize, reload */
1395               b0 = vlib_get_buffer (vm, bi0);
1396               if (IP6_ERROR_NONE != error0)
1397                 {
1398                   b0->error = node->errors[error0];
1399                 }
1400
1401               if (next0 == IP6_FULL_REASSEMBLY_NEXT_HANDOFF)
1402                 {
1403                   if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1404                     {
1405                       ip6_full_reass_add_trace (
1406                         vm, node, NULL, bi0, frag_hdr, HANDOFF,
1407                         vnet_buffer (b0)->ip.reass.owner_thread_index);
1408                     }
1409                 }
1410               else if (is_feature && IP6_ERROR_NONE == error0)
1411                 {
1412                   vnet_feature_next (&next0, b0);
1413                 }
1414
1415               /* Increment the counter to-custom-app also as this fragment is
1416                * also going to application */
1417               if (is_custom_app)
1418                 {
1419                   vlib_node_increment_counter (
1420                     vm, node->node_index, IP6_ERROR_REASS_TO_CUSTOM_APP, 1);
1421                 }
1422
1423               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1424                                                n_left_to_next, bi0, next0);
1425             }
1426
1427           if (~0 != icmp_bi)
1428             {
1429               next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1430               to_next[0] = icmp_bi;
1431               to_next += 1;
1432               n_left_to_next -= 1;
1433               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1434                                                n_left_to_next, icmp_bi,
1435                                                next0);
1436             }
1437         next_packet:
1438           from += 1;
1439           n_left_from -= 1;
1440         }
1441
1442       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1443     }
1444
1445   clib_spinlock_unlock (&rt->lock);
1446   return frame->n_vectors;
1447 }
1448
1449 VLIB_NODE_FN (ip6_full_reass_node) (vlib_main_t * vm,
1450                                     vlib_node_runtime_t * node,
1451                                     vlib_frame_t * frame)
1452 {
1453   return ip6_full_reassembly_inline (vm, node, frame, false /* is_feature */,
1454                                      false /* is_custom_app */,
1455                                      false /* is_local */);
1456 }
1457
1458 VLIB_REGISTER_NODE (ip6_full_reass_node) = {
1459     .name = "ip6-full-reassembly",
1460     .vector_size = sizeof (u32),
1461     .format_trace = format_ip6_full_reass_trace,
1462     .n_errors = IP6_N_ERROR,
1463     .error_counters = ip6_error_counters,
1464     .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1465     .next_nodes =
1466         {
1467                 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1468                 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1469                 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1470                 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reassembly-handoff",
1471         },
1472 };
1473
1474 VLIB_NODE_FN (ip6_local_full_reass_node)
1475 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
1476 {
1477   return ip6_full_reassembly_inline (vm, node, frame, false /* is_feature */,
1478                                      false /* is_custom_app */,
1479                                      true /* is_local */);
1480 }
1481
1482 VLIB_REGISTER_NODE (ip6_local_full_reass_node) = {
1483     .name = "ip6-local-full-reassembly",
1484     .vector_size = sizeof (u32),
1485     .format_trace = format_ip6_full_reass_trace,
1486     .n_errors = IP6_N_ERROR,
1487     .error_counters = ip6_error_counters,
1488     .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1489     .next_nodes =
1490         {
1491                 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1492                 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1493                 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1494                 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-local-full-reassembly-handoff",
1495         },
1496 };
1497
1498 VLIB_NODE_FN (ip6_full_reass_node_feature) (vlib_main_t * vm,
1499                                             vlib_node_runtime_t * node,
1500                                             vlib_frame_t * frame)
1501 {
1502   return ip6_full_reassembly_inline (vm, node, frame, true /* is_feature */,
1503                                      false /* is_custom_app */,
1504                                      false /* is_local */);
1505 }
1506
1507 VLIB_REGISTER_NODE (ip6_full_reass_node_feature) = {
1508     .name = "ip6-full-reassembly-feature",
1509     .vector_size = sizeof (u32),
1510     .format_trace = format_ip6_full_reass_trace,
1511     .n_errors = IP6_N_ERROR,
1512     .error_counters = ip6_error_counters,
1513     .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1514     .next_nodes =
1515         {
1516                 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1517                 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1518                 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1519                 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reass-feature-hoff",
1520         },
1521 };
1522
1523 VNET_FEATURE_INIT (ip6_full_reassembly_feature, static) = {
1524     .arc_name = "ip6-unicast",
1525     .node_name = "ip6-full-reassembly-feature",
1526     .runs_before = VNET_FEATURES ("ip6-lookup",
1527                                   "ipsec6-input-feature"),
1528     .runs_after = 0,
1529 };
1530
1531 VLIB_NODE_FN (ip6_full_reass_node_custom)
1532 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
1533 {
1534   return ip6_full_reassembly_inline (vm, node, frame, false /* is_feature */,
1535                                      true /* is_custom_app */,
1536                                      false /* is_local */);
1537 }
1538
1539 VLIB_REGISTER_NODE (ip6_full_reass_node_custom) = {
1540     .name = "ip6-full-reassembly-custom",
1541     .vector_size = sizeof (u32),
1542     .format_trace = format_ip6_full_reass_trace,
1543     .n_errors = IP6_N_ERROR,
1544     .error_counters = ip6_error_counters,
1545     .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1546     .next_nodes =
1547         {
1548                 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1549                 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1550                 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1551                 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reass-custom-hoff",
1552         },
1553 };
1554
1555 #ifndef CLIB_MARCH_VARIANT
1556 static u32
1557 ip6_full_reass_get_nbuckets ()
1558 {
1559   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1560   u32 nbuckets;
1561   u8 i;
1562
1563   /* need more mem with more workers */
1564   nbuckets = (u32) (rm->max_reass_n * (vlib_num_workers () + 1) /
1565                     IP6_FULL_REASS_HT_LOAD_FACTOR);
1566
1567   for (i = 0; i < 31; i++)
1568     if ((1 << i) >= nbuckets)
1569       break;
1570   nbuckets = 1 << i;
1571
1572   return nbuckets;
1573 }
1574 #endif /* CLIB_MARCH_VARIANT */
1575
1576 typedef enum
1577 {
1578   IP6_EVENT_CONFIG_CHANGED = 1,
1579 } ip6_full_reass_event_t;
1580
1581 #ifndef CLIB_MARCH_VARIANT
1582 typedef struct
1583 {
1584   int failure;
1585   clib_bihash_48_8_t *new_hash;
1586 } ip6_rehash_cb_ctx;
1587
1588 static int
1589 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
1590 {
1591   ip6_rehash_cb_ctx *ctx = _ctx;
1592   if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
1593     {
1594       ctx->failure = 1;
1595     }
1596   return (BIHASH_WALK_CONTINUE);
1597 }
1598
1599 static void
1600 ip6_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1601                            u32 max_reassembly_length,
1602                            u32 expire_walk_interval_ms)
1603 {
1604   ip6_full_reass_main.timeout_ms = timeout_ms;
1605   ip6_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1606   ip6_full_reass_main.max_reass_n = max_reassemblies;
1607   ip6_full_reass_main.max_reass_len = max_reassembly_length;
1608   ip6_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1609 }
1610
1611 vnet_api_error_t
1612 ip6_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
1613                     u32 max_reassembly_length, u32 expire_walk_interval_ms)
1614 {
1615   u32 old_nbuckets = ip6_full_reass_get_nbuckets ();
1616   ip6_full_reass_set_params (timeout_ms, max_reassemblies,
1617                              max_reassembly_length, expire_walk_interval_ms);
1618   vlib_process_signal_event (ip6_full_reass_main.vlib_main,
1619                              ip6_full_reass_main.ip6_full_reass_expire_node_idx,
1620                              IP6_EVENT_CONFIG_CHANGED, 0);
1621   u32 new_nbuckets = ip6_full_reass_get_nbuckets ();
1622   if (ip6_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1623     {
1624       clib_bihash_48_8_t new_hash;
1625       clib_memset (&new_hash, 0, sizeof (new_hash));
1626       ip6_rehash_cb_ctx ctx;
1627       ctx.failure = 0;
1628       ctx.new_hash = &new_hash;
1629       clib_bihash_init_48_8 (&new_hash, "ip6-full-reass", new_nbuckets,
1630                              new_nbuckets * 1024);
1631       clib_bihash_foreach_key_value_pair_48_8 (&ip6_full_reass_main.hash,
1632                                                ip6_rehash_cb, &ctx);
1633       if (ctx.failure)
1634         {
1635           clib_bihash_free_48_8 (&new_hash);
1636           return -1;
1637         }
1638       else
1639         {
1640           clib_bihash_free_48_8 (&ip6_full_reass_main.hash);
1641           clib_memcpy_fast (&ip6_full_reass_main.hash, &new_hash,
1642                             sizeof (ip6_full_reass_main.hash));
1643           clib_bihash_copied (&ip6_full_reass_main.hash, &new_hash);
1644         }
1645     }
1646   return 0;
1647 }
1648
1649 vnet_api_error_t
1650 ip6_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1651                     u32 * max_reassembly_length,
1652                     u32 * expire_walk_interval_ms)
1653 {
1654   *timeout_ms = ip6_full_reass_main.timeout_ms;
1655   *max_reassemblies = ip6_full_reass_main.max_reass_n;
1656   *max_reassembly_length = ip6_full_reass_main.max_reass_len;
1657   *expire_walk_interval_ms = ip6_full_reass_main.expire_walk_interval_ms;
1658   return 0;
1659 }
1660
1661 static clib_error_t *
1662 ip6_full_reass_init_function (vlib_main_t * vm)
1663 {
1664   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1665   clib_error_t *error = 0;
1666   u32 nbuckets;
1667   vlib_node_t *node;
1668
1669   rm->vlib_main = vm;
1670
1671   vec_validate (rm->per_thread_data, vlib_num_workers ());
1672   ip6_full_reass_per_thread_t *rt;
1673   vec_foreach (rt, rm->per_thread_data)
1674   {
1675     clib_spinlock_init (&rt->lock);
1676     pool_alloc (rt->pool, rm->max_reass_n);
1677   }
1678
1679   node = vlib_get_node_by_name (vm, (u8 *) "ip6-full-reassembly-expire-walk");
1680   ASSERT (node);
1681   rm->ip6_full_reass_expire_node_idx = node->index;
1682
1683   ip6_full_reass_set_params (IP6_FULL_REASS_TIMEOUT_DEFAULT_MS,
1684                              IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT,
1685                              IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1686                              IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1687
1688   nbuckets = ip6_full_reass_get_nbuckets ();
1689   clib_bihash_init_48_8 (&rm->hash, "ip6-full-reass", nbuckets,
1690                          nbuckets * 1024);
1691
1692   node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
1693   ASSERT (node);
1694   rm->ip6_icmp_error_idx = node->index;
1695
1696   if ((error = vlib_call_init_function (vm, ip_main_init)))
1697     return error;
1698   ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
1699                          ip6_local_full_reass_node.index);
1700   rm->is_local_reass_enabled = 1;
1701
1702   rm->fq_index = vlib_frame_queue_main_init (ip6_full_reass_node.index, 0);
1703   rm->fq_local_index =
1704     vlib_frame_queue_main_init (ip6_local_full_reass_node.index, 0);
1705   rm->fq_feature_index =
1706     vlib_frame_queue_main_init (ip6_full_reass_node_feature.index, 0);
1707   rm->fq_custom_index =
1708     vlib_frame_queue_main_init (ip6_full_reass_node_custom.index, 0);
1709
1710   rm->feature_use_refcount_per_intf = NULL;
1711   return error;
1712 }
1713
1714 VLIB_INIT_FUNCTION (ip6_full_reass_init_function);
1715 #endif /* CLIB_MARCH_VARIANT */
1716
1717 static uword
1718 ip6_full_reass_walk_expired (vlib_main_t *vm, vlib_node_runtime_t *node,
1719                              CLIB_UNUSED (vlib_frame_t *f))
1720 {
1721   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1722   uword event_type, *event_data = 0;
1723
1724   while (true)
1725     {
1726       vlib_process_wait_for_event_or_clock (vm,
1727                                             (f64) rm->expire_walk_interval_ms
1728                                             / (f64) MSEC_PER_SEC);
1729       event_type = vlib_process_get_events (vm, &event_data);
1730
1731       switch (event_type)
1732         {
1733         case ~0:
1734           /* no events => timeout */
1735           /* fallthrough */
1736         case IP6_EVENT_CONFIG_CHANGED:
1737           /* nothing to do here */
1738           break;
1739         default:
1740           clib_warning ("BUG: event type 0x%wx", event_type);
1741           break;
1742         }
1743       f64 now = vlib_time_now (vm);
1744
1745       ip6_full_reass_t *reass;
1746       int *pool_indexes_to_free = NULL;
1747
1748       uword thread_index = 0;
1749       int index;
1750       const uword nthreads = vlib_num_workers () + 1;
1751       u32 *vec_icmp_bi = NULL;
1752       u32 n_left_to_next, *to_next;
1753
1754       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1755         {
1756           ip6_full_reass_per_thread_t *rt =
1757             &rm->per_thread_data[thread_index];
1758           u32 reass_timeout_cnt = 0;
1759           clib_spinlock_lock (&rt->lock);
1760
1761           vec_reset_length (pool_indexes_to_free);
1762           /* Pace the number of timeouts handled per thread,to avoid barrier
1763            * sync issues in real world scenarios */
1764
1765           u32 beg = rt->last_id;
1766           /* to ensure we walk at least once per sec per context */
1767           u32 end = beg + (IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT *
1768                              IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS /
1769                              MSEC_PER_SEC +
1770                            1);
1771           if (end > vec_len (rt->pool))
1772             {
1773               end = vec_len (rt->pool);
1774               rt->last_id = 0;
1775             }
1776           else
1777             {
1778               rt->last_id = end;
1779             }
1780
1781           pool_foreach_stepping_index (index, beg, end, rt->pool)
1782           {
1783             reass = pool_elt_at_index (rt->pool, index);
1784             if (now > reass->last_heard + rm->timeout)
1785               {
1786                 vec_add1 (pool_indexes_to_free, index);
1787               }
1788           }
1789
1790           int *i;
1791           vec_foreach (i, pool_indexes_to_free)
1792           {
1793             ip6_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1794             u32 icmp_bi = ~0;
1795
1796             reass_timeout_cnt += reass->fragments_n;
1797             ip6_full_reass_on_timeout (vm, node, reass, &icmp_bi,
1798                                        &n_left_to_next, &to_next);
1799             if (~0 != icmp_bi)
1800               vec_add1 (vec_icmp_bi, icmp_bi);
1801
1802             ip6_full_reass_free (rm, rt, reass);
1803           }
1804
1805           clib_spinlock_unlock (&rt->lock);
1806           if (reass_timeout_cnt)
1807             vlib_node_increment_counter (vm, node->node_index,
1808                                          IP6_ERROR_REASS_TIMEOUT,
1809                                          reass_timeout_cnt);
1810         }
1811
1812       while (vec_len (vec_icmp_bi) > 0)
1813         {
1814           vlib_frame_t *f =
1815             vlib_get_frame_to_node (vm, rm->ip6_icmp_error_idx);
1816           u32 *to_next = vlib_frame_vector_args (f);
1817           u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
1818           int trace_frame = 0;
1819           while (vec_len (vec_icmp_bi) > 0 && n_left_to_next > 0)
1820             {
1821               u32 bi = vec_pop (vec_icmp_bi);
1822               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1823               if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1824                 trace_frame = 1;
1825               to_next[0] = bi;
1826               ++f->n_vectors;
1827               to_next += 1;
1828               n_left_to_next -= 1;
1829             }
1830           f->frame_flags |= (trace_frame * VLIB_FRAME_TRACE);
1831           vlib_put_frame_to_node (vm, rm->ip6_icmp_error_idx, f);
1832         }
1833
1834       vec_free (pool_indexes_to_free);
1835       vec_free (vec_icmp_bi);
1836       if (event_data)
1837         {
1838           vec_set_len (event_data, 0);
1839         }
1840     }
1841
1842   return 0;
1843 }
1844
1845 VLIB_REGISTER_NODE (ip6_full_reass_expire_node) = {
1846   .function = ip6_full_reass_walk_expired,
1847   .format_trace = format_ip6_full_reass_trace,
1848   .type = VLIB_NODE_TYPE_PROCESS,
1849   .name = "ip6-full-reassembly-expire-walk",
1850
1851   .n_errors = IP6_N_ERROR,
1852   .error_counters = ip6_error_counters,
1853 };
1854
1855 static u8 *
1856 format_ip6_full_reass_key (u8 * s, va_list * args)
1857 {
1858   ip6_full_reass_key_t *key = va_arg (*args, ip6_full_reass_key_t *);
1859   s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1860               key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1861               &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1862   return s;
1863 }
1864
1865 static u8 *
1866 format_ip6_full_reass (u8 * s, va_list * args)
1867 {
1868   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1869   ip6_full_reass_t *reass = va_arg (*args, ip6_full_reass_t *);
1870
1871   s = format (s, "ID: %lu, key: %U\n  first_bi: %u, data_len: %u, "
1872               "last_packet_octet: %u, trace_op_counter: %u\n",
1873               reass->id, format_ip6_full_reass_key, &reass->key,
1874               reass->first_bi, reass->data_len, reass->last_packet_octet,
1875               reass->trace_op_counter);
1876   u32 bi = reass->first_bi;
1877   u32 counter = 0;
1878   while (~0 != bi)
1879     {
1880       vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1881       vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1882       s = format (s, "  #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1883                   "fragment[%u, %u]\n",
1884                   counter, vnb->ip.reass.range_first,
1885                   vnb->ip.reass.range_last, bi,
1886                   ip6_full_reass_buffer_get_data_offset (b),
1887                   ip6_full_reass_buffer_get_data_len (b),
1888                   vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1889       if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1890         {
1891           bi = b->next_buffer;
1892         }
1893       else
1894         {
1895           bi = ~0;
1896         }
1897     }
1898   return s;
1899 }
1900
1901 static clib_error_t *
1902 show_ip6_full_reass (vlib_main_t * vm, unformat_input_t * input,
1903                      CLIB_UNUSED (vlib_cli_command_t * lmd))
1904 {
1905   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1906
1907   vlib_cli_output (vm, "---------------------");
1908   vlib_cli_output (vm, "IP6 reassembly status");
1909   vlib_cli_output (vm, "---------------------");
1910   bool details = false;
1911   if (unformat (input, "details"))
1912     {
1913       details = true;
1914     }
1915
1916   u32 sum_reass_n = 0;
1917   u64 sum_buffers_n = 0;
1918   ip6_full_reass_t *reass;
1919   uword thread_index;
1920   const uword nthreads = vlib_num_workers () + 1;
1921   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1922     {
1923       ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1924       clib_spinlock_lock (&rt->lock);
1925       if (details)
1926         {
1927           pool_foreach (reass, rt->pool) {
1928             vlib_cli_output (vm, "%U", format_ip6_full_reass, vm, reass);
1929           }
1930         }
1931       sum_reass_n += rt->reass_n;
1932       clib_spinlock_unlock (&rt->lock);
1933     }
1934   vlib_cli_output (vm, "---------------------");
1935   vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1936                    (long unsigned) sum_reass_n);
1937   vlib_cli_output (vm,
1938                    "Maximum configured concurrent full IP6 reassemblies per worker-thread: %lu\n",
1939                    (long unsigned) rm->max_reass_n);
1940   vlib_cli_output (vm,
1941                    "Maximum configured amount of fragments "
1942                    "per full IP6 reassembly: %lu\n",
1943                    (long unsigned) rm->max_reass_len);
1944   vlib_cli_output (vm,
1945                    "Maximum configured full IP6 reassembly timeout: %lums\n",
1946                    (long unsigned) rm->timeout_ms);
1947   vlib_cli_output (vm,
1948                    "Maximum configured full IP6 reassembly expire walk interval: %lums\n",
1949                    (long unsigned) rm->expire_walk_interval_ms);
1950   vlib_cli_output (vm, "Buffers in use: %lu\n",
1951                    (long unsigned) sum_buffers_n);
1952   return 0;
1953 }
1954
1955 VLIB_CLI_COMMAND (show_ip6_full_reassembly_cmd, static) = {
1956     .path = "show ip6-full-reassembly",
1957     .short_help = "show ip6-full-reassembly [details]",
1958     .function = show_ip6_full_reass,
1959 };
1960
1961 #ifndef CLIB_MARCH_VARIANT
1962 vnet_api_error_t
1963 ip6_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1964 {
1965   return vnet_feature_enable_disable ("ip6-unicast",
1966                                       "ip6-full-reassembly-feature",
1967                                       sw_if_index, enable_disable, 0, 0);
1968 }
1969 #endif /* CLIB_MARCH_VARIANT */
1970
1971 #define foreach_ip6_full_reassembly_handoff_error                       \
1972 _(CONGESTION_DROP, "congestion drop")
1973
1974
1975 typedef enum
1976 {
1977 #define _(sym,str) IP6_FULL_REASSEMBLY_HANDOFF_ERROR_##sym,
1978   foreach_ip6_full_reassembly_handoff_error
1979 #undef _
1980     IP6_FULL_REASSEMBLY_HANDOFF_N_ERROR,
1981 } ip6_full_reassembly_handoff_error_t;
1982
1983 static char *ip6_full_reassembly_handoff_error_strings[] = {
1984 #define _(sym,string) string,
1985   foreach_ip6_full_reassembly_handoff_error
1986 #undef _
1987 };
1988
1989 typedef struct
1990 {
1991   u32 next_worker_index;
1992 } ip6_full_reassembly_handoff_trace_t;
1993
1994 static u8 *
1995 format_ip6_full_reassembly_handoff_trace (u8 * s, va_list * args)
1996 {
1997   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1998   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1999   ip6_full_reassembly_handoff_trace_t *t =
2000     va_arg (*args, ip6_full_reassembly_handoff_trace_t *);
2001
2002   s =
2003     format (s, "ip6-full-reassembly-handoff: next-worker %d",
2004             t->next_worker_index);
2005
2006   return s;
2007 }
2008
2009 always_inline uword
2010 ip6_full_reassembly_handoff_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
2011                                     vlib_frame_t *frame,
2012                                     ip6_full_reass_node_type_t type,
2013                                     bool is_local)
2014 {
2015   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
2016
2017   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2018   u32 n_enq, n_left_from, *from;
2019   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
2020   u32 fq_index;
2021
2022   from = vlib_frame_vector_args (frame);
2023   n_left_from = frame->n_vectors;
2024   vlib_get_buffers (vm, from, bufs, n_left_from);
2025
2026   b = bufs;
2027   ti = thread_indices;
2028
2029   switch (type)
2030     {
2031     case NORMAL:
2032       if (is_local)
2033         {
2034           fq_index = rm->fq_local_index;
2035         }
2036       else
2037         {
2038           fq_index = rm->fq_index;
2039         }
2040       break;
2041     case FEATURE:
2042       fq_index = rm->fq_feature_index;
2043       break;
2044     case CUSTOM:
2045       fq_index = rm->fq_custom_index;
2046       break;
2047     default:
2048       clib_warning ("Unexpected `type' (%d)!", type);
2049       ASSERT (0);
2050     }
2051   while (n_left_from > 0)
2052     {
2053       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
2054
2055       if (PREDICT_FALSE
2056           ((node->flags & VLIB_NODE_FLAG_TRACE)
2057            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
2058         {
2059           ip6_full_reassembly_handoff_trace_t *t =
2060             vlib_add_trace (vm, node, b[0], sizeof (*t));
2061           t->next_worker_index = ti[0];
2062         }
2063
2064       n_left_from -= 1;
2065       ti += 1;
2066       b += 1;
2067     }
2068   n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from,
2069                                          thread_indices, frame->n_vectors, 1);
2070
2071   if (n_enq < frame->n_vectors)
2072     vlib_node_increment_counter (vm, node->node_index,
2073                                  IP6_FULL_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
2074                                  frame->n_vectors - n_enq);
2075   return frame->n_vectors;
2076 }
2077
2078 VLIB_NODE_FN (ip6_full_reassembly_handoff_node) (vlib_main_t * vm,
2079                                                  vlib_node_runtime_t * node,
2080                                                  vlib_frame_t * frame)
2081 {
2082   return ip6_full_reassembly_handoff_inline (vm, node, frame, NORMAL,
2083                                              false /* is_local */);
2084 }
2085
2086 VLIB_REGISTER_NODE (ip6_full_reassembly_handoff_node) = {
2087   .name = "ip6-full-reassembly-handoff",
2088   .vector_size = sizeof (u32),
2089   .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
2090   .error_strings = ip6_full_reassembly_handoff_error_strings,
2091   .format_trace = format_ip6_full_reassembly_handoff_trace,
2092
2093   .n_next_nodes = 1,
2094
2095   .next_nodes = {
2096     [0] = "error-drop",
2097   },
2098 };
2099
2100 VLIB_NODE_FN (ip6_local_full_reassembly_handoff_node)
2101 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
2102 {
2103   return ip6_full_reassembly_handoff_inline (vm, node, frame, NORMAL,
2104                                              true /* is_feature */);
2105 }
2106
2107 VLIB_REGISTER_NODE (ip6_local_full_reassembly_handoff_node) = {
2108   .name = "ip6-local-full-reassembly-handoff",
2109   .vector_size = sizeof (u32),
2110   .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
2111   .error_strings = ip6_full_reassembly_handoff_error_strings,
2112   .format_trace = format_ip6_full_reassembly_handoff_trace,
2113
2114   .n_next_nodes = 1,
2115
2116   .next_nodes = {
2117     [0] = "error-drop",
2118   },
2119 };
2120
2121 VLIB_NODE_FN (ip6_full_reassembly_feature_handoff_node) (vlib_main_t * vm,
2122                                vlib_node_runtime_t * node, vlib_frame_t * frame)
2123 {
2124   return ip6_full_reassembly_handoff_inline (vm, node, frame, FEATURE,
2125                                              false /* is_local */);
2126 }
2127
2128 VLIB_REGISTER_NODE (ip6_full_reassembly_feature_handoff_node) = {
2129   .name = "ip6-full-reass-feature-hoff",
2130   .vector_size = sizeof (u32),
2131   .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
2132   .error_strings = ip6_full_reassembly_handoff_error_strings,
2133   .format_trace = format_ip6_full_reassembly_handoff_trace,
2134
2135   .n_next_nodes = 1,
2136
2137   .next_nodes = {
2138     [0] = "error-drop",
2139   },
2140 };
2141
2142 VLIB_NODE_FN (ip6_full_reassembly_custom_handoff_node)
2143 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
2144 {
2145   return ip6_full_reassembly_handoff_inline (vm, node, frame, CUSTOM,
2146                                              false /* is_local */);
2147 }
2148
2149 VLIB_REGISTER_NODE (ip6_full_reassembly_custom_handoff_node) = {
2150   .name = "ip6-full-reass-custom-hoff",
2151   .vector_size = sizeof (u32),
2152   .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
2153   .error_strings = ip6_full_reassembly_handoff_error_strings,
2154   .format_trace = format_ip6_full_reassembly_handoff_trace,
2155
2156   .n_next_nodes = 1,
2157
2158   .next_nodes = {
2159     [0] = "error-drop",
2160   },
2161 };
2162
2163 #ifndef CLIB_MARCH_VARIANT
2164 int
2165 ip6_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
2166 {
2167   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
2168   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
2169   if (is_enable)
2170     {
2171       if (!rm->feature_use_refcount_per_intf[sw_if_index])
2172         {
2173           ++rm->feature_use_refcount_per_intf[sw_if_index];
2174           return vnet_feature_enable_disable ("ip6-unicast",
2175                                               "ip6-full-reassembly-feature",
2176                                               sw_if_index, 1, 0, 0);
2177         }
2178       ++rm->feature_use_refcount_per_intf[sw_if_index];
2179     }
2180   else
2181     {
2182       --rm->feature_use_refcount_per_intf[sw_if_index];
2183       if (!rm->feature_use_refcount_per_intf[sw_if_index])
2184         return vnet_feature_enable_disable ("ip6-unicast",
2185                                             "ip6-full-reassembly-feature",
2186                                             sw_if_index, 0, 0, 0);
2187     }
2188   return 0;
2189 }
2190
2191 void
2192 ip6_local_full_reass_enable_disable (int enable)
2193 {
2194   if (enable)
2195     {
2196       if (!ip6_full_reass_main.is_local_reass_enabled)
2197         {
2198           ip6_full_reass_main.is_local_reass_enabled = 1;
2199           ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
2200                                  ip6_local_full_reass_node.index);
2201         }
2202     }
2203   else
2204     {
2205       if (ip6_full_reass_main.is_local_reass_enabled)
2206         {
2207           ip6_full_reass_main.is_local_reass_enabled = 0;
2208           ip6_unregister_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION);
2209         }
2210     }
2211 }
2212
2213 int
2214 ip6_local_full_reass_enabled ()
2215 {
2216   return ip6_full_reass_main.is_local_reass_enabled;
2217 }
2218
2219 #endif
2220
2221 /*
2222  * fd.io coding-style-patch-verification: ON
2223  *
2224  * Local Variables:
2225  * eval: (c-set-style "gnu")
2226  * End:
2227  */