src/vnet/ip/reass/ip6_full_reass.c

   1 /*
   2  * Copyright (c) 2017 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 /**
  17  * @file
  18  * @brief IPv6 Full Reassembly.
  19  *
  20  * This file contains the source code for IPv6 full reassembly.
  21  */
  22
  23 #include <vppinfra/vec.h>
  24 #include <vnet/vnet.h>
  25 #include <vnet/ip/ip.h>
  26 #include <vppinfra/bihash_48_8.h>
  27 #include <vnet/ip/reass/ip6_full_reass.h>
  28
  29 #define MSEC_PER_SEC 1000
  30 #define IP6_FULL_REASS_TIMEOUT_DEFAULT_MS 100
  31 #define IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000    // 10 seconds default
  32 #define IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT 1024
  33 #define IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
  34 #define IP6_FULL_REASS_HT_LOAD_FACTOR (0.75)
  35
  36 typedef enum
  37 {
  38   IP6_FULL_REASS_RC_OK,
  39   IP6_FULL_REASS_RC_INTERNAL_ERROR,
  40   IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS,
  41   IP6_FULL_REASS_RC_NO_BUF,
  42   IP6_FULL_REASS_RC_HANDOFF,
  43 } ip6_full_reass_rc_t;
  44
  45 typedef struct
  46 {
  47   union
  48   {
  49     struct
  50     {
  51       ip6_address_t src;
  52       ip6_address_t dst;
  53       u32 xx_id;
  54       u32 frag_id;
  55       u8 unused[7];
  56       u8 proto;
  57     };
  58     u64 as_u64[6];
  59   };
  60 } ip6_full_reass_key_t;
  61
  62 typedef union
  63 {
  64   struct
  65   {
  66     u32 reass_index;
  67     u32 memory_owner_thread_index;
  68   };
  69   u64 as_u64;
  70 } ip6_full_reass_val_t;
  71
  72 typedef union
  73 {
  74   struct
  75   {
  76     ip6_full_reass_key_t k;
  77     ip6_full_reass_val_t v;
  78   };
  79   clib_bihash_kv_48_8_t kv;
  80 } ip6_full_reass_kv_t;
  81
  82
  83 always_inline u32
  84 ip6_full_reass_buffer_get_data_offset (vlib_buffer_t * b)
  85 {
  86   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
  87   return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first;
  88 }
  89
  90 always_inline u16
  91 ip6_full_reass_buffer_get_data_len (vlib_buffer_t * b)
  92 {
  93   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
  94   return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) -
  95     (vnb->ip.reass.fragment_first +
  96      ip6_full_reass_buffer_get_data_offset (b)) + 1;
  97 }
  98
  99 typedef struct
 100 {
 101   // hash table key
 102   ip6_full_reass_key_t key;
 103   // time when last packet was received
 104   f64 last_heard;
 105   // internal id of this reassembly
 106   u64 id;
 107   // buffer index of first buffer in this reassembly context
 108   u32 first_bi;
 109   // last octet of packet, ~0 until fragment without more_fragments arrives
 110   u32 last_packet_octet;
 111   // length of data collected so far
 112   u32 data_len;
 113   // trace operation counter
 114   u32 trace_op_counter;
 115   // next index - used by custom apps (~0 if not set)
 116   u32 next_index;
 117   // error next index - used by custom apps (~0 if not set)
 118   u32 error_next_index;
 119   // minimum fragment length for this reassembly - used to estimate MTU
 120   u16 min_fragment_length;
 121   // number of fragments for this reassembly
 122   u32 fragments_n;
 123   // thread owning memory for this context (whose pool contains this ctx)
 124   u32 memory_owner_thread_index;
 125   // thread which received fragment with offset 0 and which sends out the
 126   // completed reassembly
 127   u32 sendout_thread_index;
 128 } ip6_full_reass_t;
 129
 130 typedef struct
 131 {
 132   ip6_full_reass_t *pool;
 133   u32 reass_n;
 134   u32 id_counter;
 135   clib_spinlock_t lock;
 136 } ip6_full_reass_per_thread_t;
 137
 138 typedef struct
 139 {
 140   // IPv6 config
 141   u32 timeout_ms;
 142   f64 timeout;
 143   u32 expire_walk_interval_ms;
 144   // maximum number of fragments in one reassembly
 145   u32 max_reass_len;
 146   // maximum number of reassemblies
 147   u32 max_reass_n;
 148
 149   // IPv6 runtime
 150   clib_bihash_48_8_t hash;
 151
 152   // per-thread data
 153   ip6_full_reass_per_thread_t *per_thread_data;
 154
 155   // convenience
 156   vlib_main_t *vlib_main;
 157
 158   // node index of ip6-drop node
 159   u32 ip6_drop_idx;
 160   u32 ip6_icmp_error_idx;
 161   u32 ip6_full_reass_expire_node_idx;
 162
 163   /** Worker handoff */
 164   u32 fq_index;
 165   u32 fq_feature_index;
 166
 167   // reference count for enabling/disabling feature - per interface
 168   u32 *feature_use_refcount_per_intf;
 169 } ip6_full_reass_main_t;
 170
 171 extern ip6_full_reass_main_t ip6_full_reass_main;
 172
 173 #ifndef CLIB_MARCH_VARIANT
 174 ip6_full_reass_main_t ip6_full_reass_main;
 175 #endif /* CLIB_MARCH_VARIANT */
 176
 177 typedef enum
 178 {
 179   IP6_FULL_REASSEMBLY_NEXT_INPUT,
 180   IP6_FULL_REASSEMBLY_NEXT_DROP,
 181   IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR,
 182   IP6_FULL_REASSEMBLY_NEXT_HANDOFF,
 183   IP6_FULL_REASSEMBLY_N_NEXT,
 184 } ip6_full_reass_next_t;
 185
 186 typedef enum
 187 {
 188   RANGE_NEW,
 189   RANGE_OVERLAP,
 190   ICMP_ERROR_RT_EXCEEDED,
 191   ICMP_ERROR_FL_TOO_BIG,
 192   ICMP_ERROR_FL_NOT_MULT_8,
 193   FINALIZE,
 194   HANDOFF,
 195 } ip6_full_reass_trace_operation_e;
 196
 197 typedef struct
 198 {
 199   u16 range_first;
 200   u16 range_last;
 201   u32 range_bi;
 202   i32 data_offset;
 203   u32 data_len;
 204   u32 first_bi;
 205 } ip6_full_reass_range_trace_t;
 206
 207 typedef struct
 208 {
 209   ip6_full_reass_trace_operation_e action;
 210   u32 reass_id;
 211   ip6_full_reass_range_trace_t trace_range;
 212   u32 op_id;
 213   u32 fragment_first;
 214   u32 fragment_last;
 215   u32 total_data_len;
 216   u32 thread_id;
 217   u32 thread_id_to;
 218   bool is_after_handoff;
 219   ip6_header_t ip6_header;
 220   ip6_frag_hdr_t ip6_frag_header;
 221 } ip6_full_reass_trace_t;
 222
 223 static void
 224 ip6_full_reass_trace_details (vlib_main_t * vm, u32 bi,
 225                               ip6_full_reass_range_trace_t * trace)
 226 {
 227   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 228   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 229   trace->range_first = vnb->ip.reass.range_first;
 230   trace->range_last = vnb->ip.reass.range_last;
 231   trace->data_offset = ip6_full_reass_buffer_get_data_offset (b);
 232   trace->data_len = ip6_full_reass_buffer_get_data_len (b);
 233   trace->range_bi = bi;
 234 }
 235
 236 static u8 *
 237 format_ip6_full_reass_range_trace (u8 * s, va_list * args)
 238 {
 239   ip6_full_reass_range_trace_t *trace =
 240     va_arg (*args, ip6_full_reass_range_trace_t *);
 241   s =
 242     format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
 243             trace->range_last, trace->data_offset, trace->data_len,
 244             trace->range_bi);
 245   return s;
 246 }
 247
 248 static u8 *
 249 format_ip6_full_reass_trace (u8 * s, va_list * args)
 250 {
 251   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 252   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 253   ip6_full_reass_trace_t *t = va_arg (*args, ip6_full_reass_trace_t *);
 254   u32 indent = 0;
 255   if (~0 != t->reass_id)
 256     {
 257       if (t->is_after_handoff)
 258         {
 259           s =
 260             format (s, "%U\n", format_ip6_header, &t->ip6_header,
 261                     sizeof (t->ip6_header));
 262           s =
 263             format (s, "  %U\n", format_ip6_frag_hdr, &t->ip6_frag_header,
 264                     sizeof (t->ip6_frag_header));
 265           indent = 2;
 266         }
 267       s =
 268         format (s, "%Ureass id: %u, op id: %u, ", format_white_space, indent,
 269                 t->reass_id, t->op_id);
 270       indent = format_get_indent (s);
 271       s = format (s, "first bi: %u, data len: %u, ip/fragment[%u, %u]",
 272                   t->trace_range.first_bi, t->total_data_len,
 273                   t->fragment_first, t->fragment_last);
 274     }
 275   switch (t->action)
 276     {
 277     case RANGE_NEW:
 278       s = format (s, "\n%Unew %U", format_white_space, indent,
 279                   format_ip6_full_reass_range_trace, &t->trace_range);
 280       break;
 281     case RANGE_OVERLAP:
 282       s = format (s, "\n%Uoverlap %U", format_white_space, indent,
 283                   format_ip6_full_reass_range_trace, &t->trace_range);
 284       break;
 285     case ICMP_ERROR_FL_TOO_BIG:
 286       s = format (s, "\n%Uicmp-error - frag_len > 65535 %U",
 287                   format_white_space, indent,
 288                   format_ip6_full_reass_range_trace, &t->trace_range);
 289       break;
 290     case ICMP_ERROR_FL_NOT_MULT_8:
 291       s = format (s, "\n%Uicmp-error - frag_len mod 8 != 0 %U",
 292                   format_white_space, indent,
 293                   format_ip6_full_reass_range_trace, &t->trace_range);
 294       break;
 295     case ICMP_ERROR_RT_EXCEEDED:
 296       s = format (s, "\n%Uicmp-error - reassembly time exceeded",
 297                   format_white_space, indent);
 298       break;
 299     case FINALIZE:
 300       s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
 301       break;
 302     case HANDOFF:
 303       s =
 304         format (s, "handoff from thread #%u to thread #%u", t->thread_id,
 305                 t->thread_id_to);
 306       break;
 307     }
 308   return s;
 309 }
 310
 311 static void
 312 ip6_full_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 313                           ip6_full_reass_main_t * rm,
 314                           ip6_full_reass_t * reass, u32 bi,
 315                           ip6_frag_hdr_t * ip6_frag_header,
 316                           ip6_full_reass_trace_operation_e action,
 317                           u32 thread_id_to)
 318 {
 319   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 320   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 321   bool is_after_handoff = false;
 322   if (vlib_buffer_get_trace_thread (b) != vm->thread_index)
 323     {
 324       is_after_handoff = true;
 325     }
 326   ip6_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 327   t->is_after_handoff = is_after_handoff;
 328   if (t->is_after_handoff)
 329     {
 330       clib_memcpy (&t->ip6_header, vlib_buffer_get_current (b),
 331                    clib_min (sizeof (t->ip6_header), b->current_length));
 332       if (ip6_frag_header)
 333         {
 334           clib_memcpy (&t->ip6_frag_header, ip6_frag_header,
 335                        sizeof (t->ip6_frag_header));
 336         }
 337       else
 338         {
 339           clib_memset (&t->ip6_frag_header, 0, sizeof (t->ip6_frag_header));
 340         }
 341     }
 342   if (reass)
 343     {
 344       t->reass_id = reass->id;
 345       t->op_id = reass->trace_op_counter;
 346       t->trace_range.first_bi = reass->first_bi;
 347       t->total_data_len = reass->data_len;
 348       ++reass->trace_op_counter;
 349     }
 350   else
 351     {
 352       t->reass_id = ~0;
 353     }
 354   t->action = action;
 355   t->thread_id = vm->thread_index;
 356   t->thread_id_to = thread_id_to;
 357   ip6_full_reass_trace_details (vm, bi, &t->trace_range);
 358   t->fragment_first = vnb->ip.reass.fragment_first;
 359   t->fragment_last = vnb->ip.reass.fragment_last;
 360 #if 0
 361   static u8 *s = NULL;
 362   s = format (s, "%U", format_ip6_full_reass_trace, NULL, NULL, t);
 363   printf ("%.*s\n", vec_len (s), s);
 364   fflush (stdout);
 365   vec_reset_length (s);
 366 #endif
 367 }
 368
 369 always_inline void
 370 ip6_full_reass_free_ctx (ip6_full_reass_per_thread_t * rt,
 371                          ip6_full_reass_t * reass)
 372 {
 373   pool_put (rt->pool, reass);
 374   --rt->reass_n;
 375 }
 376
 377 always_inline void
 378 ip6_full_reass_free (ip6_full_reass_main_t * rm,
 379                      ip6_full_reass_per_thread_t * rt,
 380                      ip6_full_reass_t * reass)
 381 {
 382   clib_bihash_kv_48_8_t kv;
 383   kv.key[0] = reass->key.as_u64[0];
 384   kv.key[1] = reass->key.as_u64[1];
 385   kv.key[2] = reass->key.as_u64[2];
 386   kv.key[3] = reass->key.as_u64[3];
 387   kv.key[4] = reass->key.as_u64[4];
 388   kv.key[5] = reass->key.as_u64[5];
 389   clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
 390   ip6_full_reass_free_ctx (rt, reass);
 391 }
 392
 393 always_inline void
 394 ip6_full_reass_drop_all (vlib_main_t * vm, vlib_node_runtime_t * node,
 395                          ip6_full_reass_main_t * rm, ip6_full_reass_t * reass)
 396 {
 397   u32 range_bi = reass->first_bi;
 398   vlib_buffer_t *range_b;
 399   vnet_buffer_opaque_t *range_vnb;
 400   u32 *to_free = NULL;
 401   while (~0 != range_bi)
 402     {
 403       range_b = vlib_get_buffer (vm, range_bi);
 404       range_vnb = vnet_buffer (range_b);
 405       u32 bi = range_bi;
 406       while (~0 != bi)
 407         {
 408           vec_add1 (to_free, bi);
 409           vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 410           if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 411             {
 412               bi = b->next_buffer;
 413               b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 414             }
 415           else
 416             {
 417               bi = ~0;
 418             }
 419         }
 420       range_bi = range_vnb->ip.reass.next_range_bi;
 421     }
 422   /* send to next_error_index */
 423   if (~0 != reass->error_next_index)
 424     {
 425       u32 n_left_to_next, *to_next, next_index;
 426
 427       next_index = reass->error_next_index;
 428       u32 bi = ~0;
 429
 430       while (vec_len (to_free) > 0)
 431         {
 432           vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 433
 434           while (vec_len (to_free) > 0 && n_left_to_next > 0)
 435             {
 436               bi = vec_pop (to_free);
 437
 438               if (~0 != bi)
 439                 {
 440                   to_next[0] = bi;
 441                   to_next += 1;
 442                   n_left_to_next -= 1;
 443                 }
 444             }
 445           vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 446         }
 447     }
 448   else
 449     {
 450       vlib_buffer_free (vm, to_free, vec_len (to_free));
 451     }
 452   vec_free (to_free);
 453 }
 454
 455 always_inline void
 456 ip6_full_reass_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * node,
 457                            ip6_full_reass_main_t * rm,
 458                            ip6_full_reass_t * reass, u32 * icmp_bi)
 459 {
 460   if (~0 == reass->first_bi)
 461     {
 462       return;
 463     }
 464   if (~0 == reass->next_index)  // custom apps don't want icmp
 465     {
 466       vlib_buffer_t *b = vlib_get_buffer (vm, reass->first_bi);
 467       if (0 == vnet_buffer (b)->ip.reass.fragment_first)
 468         {
 469           *icmp_bi = reass->first_bi;
 470           if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
 471             {
 472               ip6_full_reass_add_trace (vm, node, rm, reass, reass->first_bi,
 473                                         NULL, ICMP_ERROR_RT_EXCEEDED, ~0);
 474             }
 475           // fragment with offset zero received - send icmp message back
 476           if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 477             {
 478               // separate first buffer from chain and steer it towards icmp node
 479               b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 480               reass->first_bi = b->next_buffer;
 481             }
 482           else
 483             {
 484               reass->first_bi = vnet_buffer (b)->ip.reass.next_range_bi;
 485             }
 486           icmp6_error_set_vnet_buffer (b, ICMP6_time_exceeded,
 487                                        ICMP6_time_exceeded_fragment_reassembly_time_exceeded,
 488                                        0);
 489         }
 490     }
 491   ip6_full_reass_drop_all (vm, node, rm, reass);
 492 }
 493
 494 always_inline ip6_full_reass_t *
 495 ip6_full_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
 496                                ip6_full_reass_main_t * rm,
 497                                ip6_full_reass_per_thread_t * rt,
 498                                ip6_full_reass_kv_t * kv, u32 * icmp_bi,
 499                                u8 * do_handoff)
 500 {
 501   ip6_full_reass_t *reass;
 502   f64 now;
 503
 504 again:
 505
 506   reass = NULL;
 507   now = vlib_time_now (vm);
 508
 509   if (!clib_bihash_search_48_8
 510       (&rm->hash, (clib_bihash_kv_48_8_t *) kv, (clib_bihash_kv_48_8_t *) kv))
 511     {
 512       reass =
 513         pool_elt_at_index (rm->per_thread_data
 514                            [kv->v.memory_owner_thread_index].pool,
 515                            kv->v.reass_index);
 516       if (vm->thread_index != kv->v.memory_owner_thread_index)
 517         {
 518           *do_handoff = 1;
 519           return reass;
 520         }
 521
 522       if (now > reass->last_heard + rm->timeout)
 523         {
 524           ip6_full_reass_on_timeout (vm, node, rm, reass, icmp_bi);
 525           ip6_full_reass_free (rm, rt, reass);
 526           reass = NULL;
 527         }
 528     }
 529
 530   if (reass)
 531     {
 532       reass->last_heard = now;
 533       return reass;
 534     }
 535
 536   if (rt->reass_n >= rm->max_reass_n)
 537     {
 538       reass = NULL;
 539       return reass;
 540     }
 541   else
 542     {
 543       pool_get (rt->pool, reass);
 544       clib_memset (reass, 0, sizeof (*reass));
 545       reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 546       ++rt->id_counter;
 547       reass->first_bi = ~0;
 548       reass->last_packet_octet = ~0;
 549       reass->data_len = 0;
 550       reass->next_index = ~0;
 551       reass->error_next_index = ~0;
 552       ++rt->reass_n;
 553     }
 554
 555   reass->key.as_u64[0] = ((clib_bihash_kv_48_8_t *) kv)->key[0];
 556   reass->key.as_u64[1] = ((clib_bihash_kv_48_8_t *) kv)->key[1];
 557   reass->key.as_u64[2] = ((clib_bihash_kv_48_8_t *) kv)->key[2];
 558   reass->key.as_u64[3] = ((clib_bihash_kv_48_8_t *) kv)->key[3];
 559   reass->key.as_u64[4] = ((clib_bihash_kv_48_8_t *) kv)->key[4];
 560   reass->key.as_u64[5] = ((clib_bihash_kv_48_8_t *) kv)->key[5];
 561   kv->v.reass_index = (reass - rt->pool);
 562   kv->v.memory_owner_thread_index = vm->thread_index;
 563   reass->last_heard = now;
 564
 565   int rv =
 566     clib_bihash_add_del_48_8 (&rm->hash, (clib_bihash_kv_48_8_t *) kv, 2);
 567   if (rv)
 568     {
 569       ip6_full_reass_free (rm, rt, reass);
 570       reass = NULL;
 571       // if other worker created a context already work with the other copy
 572       if (-2 == rv)
 573         goto again;
 574     }
 575
 576   return reass;
 577 }
 578
 579 always_inline ip6_full_reass_rc_t
 580 ip6_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
 581                          ip6_full_reass_main_t * rm,
 582                          ip6_full_reass_per_thread_t * rt,
 583                          ip6_full_reass_t * reass, u32 * bi0, u32 * next0,
 584                          u32 * error0, bool is_custom_app)
 585 {
 586   *bi0 = reass->first_bi;
 587   *error0 = IP6_ERROR_NONE;
 588   ip6_frag_hdr_t *frag_hdr;
 589   vlib_buffer_t *last_b = NULL;
 590   u32 sub_chain_bi = reass->first_bi;
 591   u32 total_length = 0;
 592   u32 buf_cnt = 0;
 593   u32 dropped_cnt = 0;
 594   u32 *vec_drop_compress = NULL;
 595   ip6_full_reass_rc_t rv = IP6_FULL_REASS_RC_OK;
 596   do
 597     {
 598       u32 tmp_bi = sub_chain_bi;
 599       vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
 600       vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
 601       if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 602           !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 603         {
 604           rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 605           goto free_buffers_and_return;
 606         }
 607
 608       u32 data_len = ip6_full_reass_buffer_get_data_len (tmp);
 609       u32 trim_front = vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
 610         sizeof (*frag_hdr) + ip6_full_reass_buffer_get_data_offset (tmp);
 611       u32 trim_end =
 612         vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
 613       if (tmp_bi == reass->first_bi)
 614         {
 615           /* first buffer - keep ip6 header */
 616           if (0 != ip6_full_reass_buffer_get_data_offset (tmp))
 617             {
 618               rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 619               goto free_buffers_and_return;
 620             }
 621           trim_front = 0;
 622           trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
 623             (vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
 624              sizeof (*frag_hdr));
 625           if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
 626             {
 627               rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 628               goto free_buffers_and_return;
 629             }
 630         }
 631       u32 keep_data =
 632         vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
 633       while (1)
 634         {
 635           ++buf_cnt;
 636           if (trim_front)
 637             {
 638               if (trim_front > tmp->current_length)
 639                 {
 640                   /* drop whole buffer */
 641                   vec_add1 (vec_drop_compress, tmp_bi);
 642                   trim_front -= tmp->current_length;
 643                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 644                     {
 645                       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 646                       goto free_buffers_and_return;
 647                     }
 648                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 649                   tmp_bi = tmp->next_buffer;
 650                   tmp = vlib_get_buffer (vm, tmp_bi);
 651                   continue;
 652                 }
 653               else
 654                 {
 655                   vlib_buffer_advance (tmp, trim_front);
 656                   trim_front = 0;
 657                 }
 658             }
 659           if (keep_data)
 660             {
 661               if (last_b)
 662                 {
 663                   last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
 664                   last_b->next_buffer = tmp_bi;
 665                 }
 666               last_b = tmp;
 667               if (keep_data <= tmp->current_length)
 668                 {
 669                   tmp->current_length = keep_data;
 670                   keep_data = 0;
 671                 }
 672               else
 673                 {
 674                   keep_data -= tmp->current_length;
 675                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 676                     {
 677                       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 678                       goto free_buffers_and_return;
 679                     }
 680                 }
 681               total_length += tmp->current_length;
 682             }
 683           else
 684             {
 685               vec_add1 (vec_drop_compress, tmp_bi);
 686               if (reass->first_bi == tmp_bi)
 687                 {
 688                   rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 689                   goto free_buffers_and_return;
 690                 }
 691               ++dropped_cnt;
 692             }
 693           if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 694             {
 695               tmp_bi = tmp->next_buffer;
 696               tmp = vlib_get_buffer (vm, tmp->next_buffer);
 697             }
 698           else
 699             {
 700               break;
 701             }
 702         }
 703       sub_chain_bi =
 704         vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
 705         reass.next_range_bi;
 706     }
 707   while (~0 != sub_chain_bi);
 708
 709   if (!last_b)
 710     {
 711       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 712       goto free_buffers_and_return;
 713     }
 714   last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 715   vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
 716   if (total_length < first_b->current_length)
 717     {
 718       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 719       goto free_buffers_and_return;
 720     }
 721   total_length -= first_b->current_length;
 722   first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
 723   first_b->total_length_not_including_first_buffer = total_length;
 724   // drop fragment header
 725   vnet_buffer_opaque_t *first_b_vnb = vnet_buffer (first_b);
 726   ip6_header_t *ip = vlib_buffer_get_current (first_b);
 727   u16 ip6_frag_hdr_offset = first_b_vnb->ip.reass.ip6_frag_hdr_offset;
 728   ip6_ext_header_t *prev_hdr;
 729   frag_hdr =
 730     ip6_ext_header_find (vm, first_b, ip, IP_PROTOCOL_IPV6_FRAGMENTATION,
 731                          &prev_hdr);
 732   if (prev_hdr)
 733     {
 734       prev_hdr->next_hdr = frag_hdr->next_hdr;
 735     }
 736   else
 737     {
 738       ip->protocol = frag_hdr->next_hdr;
 739     }
 740   if (!((u8 *) frag_hdr - (u8 *) ip == ip6_frag_hdr_offset))
 741     {
 742       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 743       goto free_buffers_and_return;
 744     }
 745   memmove (frag_hdr, (u8 *) frag_hdr + sizeof (*frag_hdr),
 746            first_b->current_length - ip6_frag_hdr_offset -
 747            sizeof (ip6_frag_hdr_t));
 748   first_b->current_length -= sizeof (*frag_hdr);
 749   ip->payload_length =
 750     clib_host_to_net_u16 (total_length + first_b->current_length -
 751                           sizeof (*ip));
 752   if (!vlib_buffer_chain_linearize (vm, first_b))
 753     {
 754       rv = IP6_FULL_REASS_RC_NO_BUF;
 755       goto free_buffers_and_return;
 756     }
 757   first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
 758   if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
 759     {
 760       ip6_full_reass_add_trace (vm, node, rm, reass, reass->first_bi, NULL,
 761                                 FINALIZE, ~0);
 762 #if 0
 763       // following code does a hexdump of packet fragments to stdout ...
 764       do
 765         {
 766           u32 bi = reass->first_bi;
 767           u8 *s = NULL;
 768           while (~0 != bi)
 769             {
 770               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 771               s = format (s, "%u: %U\n", bi, format_hexdump,
 772                           vlib_buffer_get_current (b), b->current_length);
 773               if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 774                 {
 775                   bi = b->next_buffer;
 776                 }
 777               else
 778                 {
 779                   break;
 780                 }
 781             }
 782           printf ("%.*s\n", vec_len (s), s);
 783           fflush (stdout);
 784           vec_free (s);
 785         }
 786       while (0);
 787 #endif
 788     }
 789   if (!is_custom_app)
 790     {
 791       *next0 = IP6_FULL_REASSEMBLY_NEXT_INPUT;
 792     }
 793   else
 794     {
 795       *next0 = reass->next_index;
 796     }
 797   vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
 798   ip6_full_reass_free (rm, rt, reass);
 799   reass = NULL;
 800 free_buffers_and_return:
 801   vlib_buffer_free (vm, vec_drop_compress, vec_len (vec_drop_compress));
 802   vec_free (vec_drop_compress);
 803   return rv;
 804 }
 805
 806 always_inline void
 807 ip6_full_reass_insert_range_in_chain (vlib_main_t * vm,
 808                                       ip6_full_reass_main_t * rm,
 809                                       ip6_full_reass_per_thread_t * rt,
 810                                       ip6_full_reass_t * reass,
 811                                       u32 prev_range_bi, u32 new_next_bi)
 812 {
 813
 814   vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
 815   vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
 816   if (~0 != prev_range_bi)
 817     {
 818       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 819       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 820       new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
 821       prev_vnb->ip.reass.next_range_bi = new_next_bi;
 822     }
 823   else
 824     {
 825       if (~0 != reass->first_bi)
 826         {
 827           new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
 828         }
 829       reass->first_bi = new_next_bi;
 830     }
 831   reass->data_len += ip6_full_reass_buffer_get_data_len (new_next_b);
 832 }
 833
 834 always_inline ip6_full_reass_rc_t
 835 ip6_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 836                        ip6_full_reass_main_t * rm,
 837                        ip6_full_reass_per_thread_t * rt,
 838                        ip6_full_reass_t * reass, u32 * bi0, u32 * next0,
 839                        u32 * error0, ip6_frag_hdr_t * frag_hdr,
 840                        bool is_custom_app, u32 * handoff_thread_idx)
 841 {
 842   int consumed = 0;
 843   vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
 844   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 845   if (is_custom_app)
 846     {
 847       reass->next_index = fvnb->ip.reass.next_index;    // store next_index before it's overwritten
 848       reass->error_next_index = fvnb->ip.reass.error_next_index;        // store error_next_index before it is overwritten
 849     }
 850
 851   fvnb->ip.reass.ip6_frag_hdr_offset =
 852     (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
 853   ip6_header_t *fip = vlib_buffer_get_current (fb);
 854   if (fb->current_length < sizeof (*fip) ||
 855       fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
 856       fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
 857     {
 858       return IP6_FULL_REASS_RC_INTERNAL_ERROR;
 859     }
 860
 861   u32 fragment_first = fvnb->ip.reass.fragment_first =
 862     ip6_frag_hdr_offset_bytes (frag_hdr);
 863   u32 fragment_length =
 864     vlib_buffer_length_in_chain (vm, fb) -
 865     (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 866   u32 fragment_last = fvnb->ip.reass.fragment_last =
 867     fragment_first + fragment_length - 1;
 868   int more_fragments = ip6_frag_hdr_more (frag_hdr);
 869   u32 candidate_range_bi = reass->first_bi;
 870   u32 prev_range_bi = ~0;
 871   fvnb->ip.reass.range_first = fragment_first;
 872   fvnb->ip.reass.range_last = fragment_last;
 873   fvnb->ip.reass.next_range_bi = ~0;
 874   if (!more_fragments)
 875     {
 876       reass->last_packet_octet = fragment_last;
 877     }
 878   if (~0 == reass->first_bi)
 879     {
 880       // starting a new reassembly
 881       ip6_full_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi,
 882                                             *bi0);
 883       reass->min_fragment_length = clib_net_to_host_u16 (fip->payload_length);
 884       consumed = 1;
 885       reass->fragments_n = 1;
 886       goto check_if_done_maybe;
 887     }
 888   reass->min_fragment_length =
 889     clib_min (clib_net_to_host_u16 (fip->payload_length),
 890               fvnb->ip.reass.estimated_mtu);
 891   while (~0 != candidate_range_bi)
 892     {
 893       vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
 894       vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
 895       if (fragment_first > candidate_vnb->ip.reass.range_last)
 896         {
 897           // this fragments starts after candidate range
 898           prev_range_bi = candidate_range_bi;
 899           candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
 900           if (candidate_vnb->ip.reass.range_last < fragment_last &&
 901               ~0 == candidate_range_bi)
 902             {
 903               // special case - this fragment falls beyond all known ranges
 904               ip6_full_reass_insert_range_in_chain (vm, rm, rt, reass,
 905                                                     prev_range_bi, *bi0);
 906               consumed = 1;
 907               break;
 908             }
 909           continue;
 910         }
 911       if (fragment_last < candidate_vnb->ip.reass.range_first)
 912         {
 913           // this fragment ends before candidate range without any overlap
 914           ip6_full_reass_insert_range_in_chain (vm, rm, rt, reass,
 915                                                 prev_range_bi, *bi0);
 916           consumed = 1;
 917         }
 918       else if (fragment_first == candidate_vnb->ip.reass.range_first &&
 919                fragment_last == candidate_vnb->ip.reass.range_last)
 920         {
 921           // duplicate fragment - ignore
 922         }
 923       else
 924         {
 925           // overlapping fragment - not allowed by RFC 8200
 926           if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 927             {
 928               ip6_full_reass_add_trace (vm, node, rm, reass, *bi0, frag_hdr,
 929                                         RANGE_OVERLAP, ~0);
 930             }
 931           ip6_full_reass_drop_all (vm, node, rm, reass);
 932           ip6_full_reass_free (rm, rt, reass);
 933           *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
 934           *error0 = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT;
 935           return IP6_FULL_REASS_RC_OK;
 936         }
 937       break;
 938     }
 939   ++reass->fragments_n;
 940 check_if_done_maybe:
 941   if (consumed)
 942     {
 943       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 944         {
 945           ip6_full_reass_add_trace (vm, node, rm, reass, *bi0, frag_hdr,
 946                                     RANGE_NEW, ~0);
 947         }
 948     }
 949   if (~0 != reass->last_packet_octet &&
 950       reass->data_len == reass->last_packet_octet + 1)
 951     {
 952       *handoff_thread_idx = reass->sendout_thread_index;
 953       int handoff =
 954         reass->memory_owner_thread_index != reass->sendout_thread_index;
 955       ip6_full_reass_rc_t rc =
 956         ip6_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
 957                                  is_custom_app);
 958       if (IP6_FULL_REASS_RC_OK == rc && handoff)
 959         {
 960           return IP6_FULL_REASS_RC_HANDOFF;
 961         }
 962       return rc;
 963     }
 964   else
 965     {
 966       if (consumed)
 967         {
 968           *bi0 = ~0;
 969           if (reass->fragments_n > rm->max_reass_len)
 970             {
 971               return IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS;
 972             }
 973         }
 974       else
 975         {
 976           *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
 977           *error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT;
 978         }
 979     }
 980   return IP6_FULL_REASS_RC_OK;
 981 }
 982
 983 always_inline bool
 984 ip6_full_reass_verify_upper_layer_present (vlib_node_runtime_t * node,
 985                                            vlib_buffer_t * b,
 986                                            ip6_frag_hdr_t * frag_hdr)
 987 {
 988   ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr;
 989   while (ip6_ext_hdr (tmp->next_hdr))
 990     {
 991       tmp = ip6_ext_next_header (tmp);
 992     }
 993   if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr)
 994     {
 995       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 996                                    ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
 997                                    0);
 998       b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
 999
1000       return false;
1001     }
1002   return true;
1003 }
1004
1005 always_inline bool
1006 ip6_full_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
1007                                            vlib_node_runtime_t * node,
1008                                            vlib_buffer_t * b,
1009                                            ip6_frag_hdr_t * frag_hdr)
1010 {
1011   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1012   ip6_header_t *ip = vlib_buffer_get_current (b);
1013   int more_fragments = ip6_frag_hdr_more (frag_hdr);
1014   u32 fragment_length =
1015     vlib_buffer_length_in_chain (vm, b) -
1016     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
1017   if (more_fragments && 0 != fragment_length % 8)
1018     {
1019       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
1020                                    ICMP6_parameter_problem_erroneous_header_field,
1021                                    (u8 *) & ip->payload_length - (u8 *) ip);
1022       return false;
1023     }
1024   return true;
1025 }
1026
1027 always_inline bool
1028 ip6_full_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
1029                                           vlib_node_runtime_t * node,
1030                                           vlib_buffer_t * b,
1031                                           ip6_frag_hdr_t * frag_hdr)
1032 {
1033   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1034   u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
1035   u32 fragment_length =
1036     vlib_buffer_length_in_chain (vm, b) -
1037     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
1038   if (fragment_first + fragment_length > 65535)
1039     {
1040       ip6_header_t *ip0 = vlib_buffer_get_current (b);
1041       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
1042                                    ICMP6_parameter_problem_erroneous_header_field,
1043                                    (u8 *) & frag_hdr->fragment_offset_and_more
1044                                    - (u8 *) ip0);
1045       return false;
1046     }
1047   return true;
1048 }
1049
1050 always_inline uword
1051 ip6_full_reassembly_inline (vlib_main_t * vm,
1052                             vlib_node_runtime_t * node,
1053                             vlib_frame_t * frame, bool is_feature,
1054                             bool is_custom_app)
1055 {
1056   u32 *from = vlib_frame_vector_args (frame);
1057   u32 n_left_from, n_left_to_next, *to_next, next_index;
1058   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1059   ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1060   clib_spinlock_lock (&rt->lock);
1061
1062   n_left_from = frame->n_vectors;
1063   next_index = node->cached_next_index;
1064   while (n_left_from > 0)
1065     {
1066       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1067
1068       while (n_left_from > 0 && n_left_to_next > 0)
1069         {
1070           u32 bi0;
1071           vlib_buffer_t *b0;
1072           u32 next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1073           u32 error0 = IP6_ERROR_NONE;
1074           u32 icmp_bi = ~0;
1075
1076           bi0 = from[0];
1077           b0 = vlib_get_buffer (vm, bi0);
1078
1079           ip6_header_t *ip0 = vlib_buffer_get_current (b0);
1080           ip6_frag_hdr_t *frag_hdr = NULL;
1081           ip6_ext_header_t *prev_hdr;
1082           if (ip6_ext_hdr (ip0->protocol))
1083             {
1084               frag_hdr =
1085                 ip6_ext_header_find (vm, b0, ip0,
1086                                      IP_PROTOCOL_IPV6_FRAGMENTATION,
1087                                      &prev_hdr);
1088             }
1089           if (!frag_hdr)
1090             {
1091               // this is a regular packet - no fragmentation
1092               next0 = IP6_FULL_REASSEMBLY_NEXT_INPUT;
1093               goto skip_reass;
1094             }
1095           vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
1096             (u8 *) frag_hdr - (u8 *) ip0;
1097
1098           if (0 == ip6_frag_hdr_offset (frag_hdr))
1099             {
1100               // first fragment - verify upper-layer is present
1101               if (!ip6_full_reass_verify_upper_layer_present
1102                   (node, b0, frag_hdr))
1103                 {
1104                   next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1105                   goto skip_reass;
1106                 }
1107             }
1108           if (!ip6_full_reass_verify_fragment_multiple_8
1109               (vm, node, b0, frag_hdr)
1110               || !ip6_full_reass_verify_packet_size_lt_64k (vm, node, b0,
1111                                                             frag_hdr))
1112             {
1113               next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1114               goto skip_reass;
1115             }
1116           ip6_full_reass_kv_t kv;
1117           u8 do_handoff = 0;
1118
1119           kv.k.as_u64[0] = ip0->src_address.as_u64[0];
1120           kv.k.as_u64[1] = ip0->src_address.as_u64[1];
1121           kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
1122           kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
1123           kv.k.as_u64[4] =
1124             ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
1125                             vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
1126             (u64) frag_hdr->identification;
1127           kv.k.as_u64[5] = ip0->protocol;
1128
1129           ip6_full_reass_t *reass =
1130             ip6_full_reass_find_or_create (vm, node, rm, rt, &kv, &icmp_bi,
1131                                            &do_handoff);
1132
1133           if (reass)
1134             {
1135               const u32 fragment_first = ip6_frag_hdr_offset (frag_hdr);
1136               if (0 == fragment_first)
1137                 {
1138                   reass->sendout_thread_index = vm->thread_index;
1139                 }
1140             }
1141           if (PREDICT_FALSE (do_handoff))
1142             {
1143               next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
1144               vnet_buffer (b0)->ip.reass.owner_thread_index =
1145                 kv.v.memory_owner_thread_index;
1146             }
1147           else if (reass)
1148             {
1149               u32 handoff_thread_idx;
1150               switch (ip6_full_reass_update
1151                       (vm, node, rm, rt, reass, &bi0, &next0, &error0,
1152                        frag_hdr, is_custom_app, &handoff_thread_idx))
1153                 {
1154                 case IP6_FULL_REASS_RC_OK:
1155                   /* nothing to do here */
1156                   break;
1157                 case IP6_FULL_REASS_RC_HANDOFF:
1158                   next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
1159                   b0 = vlib_get_buffer (vm, bi0);
1160                   vnet_buffer (b0)->ip.reass.owner_thread_index =
1161                     handoff_thread_idx;
1162                   break;
1163                 case IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS:
1164                   vlib_node_increment_counter (vm, node->node_index,
1165                                                IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
1166                                                1);
1167                   ip6_full_reass_drop_all (vm, node, rm, reass);
1168                   ip6_full_reass_free (rm, rt, reass);
1169                   goto next_packet;
1170                   break;
1171                 case IP6_FULL_REASS_RC_NO_BUF:
1172                   vlib_node_increment_counter (vm, node->node_index,
1173                                                IP6_ERROR_REASS_NO_BUF, 1);
1174                   ip6_full_reass_drop_all (vm, node, rm, reass);
1175                   ip6_full_reass_free (rm, rt, reass);
1176                   goto next_packet;
1177                   break;
1178                 case IP6_FULL_REASS_RC_INTERNAL_ERROR:
1179                   vlib_node_increment_counter (vm, node->node_index,
1180                                                IP6_ERROR_REASS_INTERNAL_ERROR,
1181                                                1);
1182                   ip6_full_reass_drop_all (vm, node, rm, reass);
1183                   ip6_full_reass_free (rm, rt, reass);
1184                   goto next_packet;
1185                   break;
1186                 }
1187             }
1188           else
1189             {
1190               if (is_feature)
1191                 {
1192                   next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1193                 }
1194               else
1195                 {
1196                   vnet_buffer_opaque_t *fvnb = vnet_buffer (b0);
1197                   next0 = fvnb->ip.reass.error_next_index;
1198                 }
1199               error0 = IP6_ERROR_REASS_LIMIT_REACHED;
1200             }
1201
1202           if (~0 != bi0)
1203             {
1204             skip_reass:
1205               to_next[0] = bi0;
1206               to_next += 1;
1207               n_left_to_next -= 1;
1208
1209               /* bi0 might have been updated by reass_finalize, reload */
1210               b0 = vlib_get_buffer (vm, bi0);
1211               if (IP6_ERROR_NONE != error0)
1212                 {
1213                   b0->error = node->errors[error0];
1214                 }
1215
1216               if (next0 == IP6_FULL_REASSEMBLY_NEXT_HANDOFF)
1217                 {
1218                   if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1219                     {
1220                       ip6_full_reass_add_trace (vm, node, rm, NULL, bi0,
1221                                                 frag_hdr, HANDOFF,
1222                                                 vnet_buffer (b0)->ip.
1223                                                 reass.owner_thread_index);
1224                     }
1225                 }
1226               else if (is_feature && IP6_ERROR_NONE == error0)
1227                 {
1228                   vnet_feature_next (&next0, b0);
1229                 }
1230               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1231                                                n_left_to_next, bi0, next0);
1232             }
1233
1234           if (~0 != icmp_bi)
1235             {
1236               next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1237               to_next[0] = icmp_bi;
1238               to_next += 1;
1239               n_left_to_next -= 1;
1240               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1241                                                n_left_to_next, icmp_bi,
1242                                                next0);
1243             }
1244         next_packet:
1245           from += 1;
1246           n_left_from -= 1;
1247         }
1248
1249       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1250     }
1251
1252   clib_spinlock_unlock (&rt->lock);
1253   return frame->n_vectors;
1254 }
1255
1256 static char *ip6_full_reassembly_error_strings[] = {
1257 #define _(sym, string) string,
1258   foreach_ip6_error
1259 #undef _
1260 };
1261
1262 VLIB_NODE_FN (ip6_full_reass_node) (vlib_main_t * vm,
1263                                     vlib_node_runtime_t * node,
1264                                     vlib_frame_t * frame)
1265 {
1266   return ip6_full_reassembly_inline (vm, node, frame, false /* is_feature */ ,
1267                                      false /* is_custom_app */ );
1268 }
1269
1270 /* *INDENT-OFF* */
1271 VLIB_REGISTER_NODE (ip6_full_reass_node) = {
1272     .name = "ip6-full-reassembly",
1273     .vector_size = sizeof (u32),
1274     .format_trace = format_ip6_full_reass_trace,
1275     .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1276     .error_strings = ip6_full_reassembly_error_strings,
1277     .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1278     .next_nodes =
1279         {
1280                 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1281                 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1282                 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1283                 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reassembly-handoff",
1284         },
1285 };
1286 /* *INDENT-ON* */
1287
1288 VLIB_NODE_FN (ip6_full_reass_node_feature) (vlib_main_t * vm,
1289                                             vlib_node_runtime_t * node,
1290                                             vlib_frame_t * frame)
1291 {
1292   return ip6_full_reassembly_inline (vm, node, frame, true /* is_feature */ ,
1293                                      false /* is_custom_app */ );
1294 }
1295
1296 /* *INDENT-OFF* */
1297 VLIB_REGISTER_NODE (ip6_full_reass_node_feature) = {
1298     .name = "ip6-full-reassembly-feature",
1299     .vector_size = sizeof (u32),
1300     .format_trace = format_ip6_full_reass_trace,
1301     .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1302     .error_strings = ip6_full_reassembly_error_strings,
1303     .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1304     .next_nodes =
1305         {
1306                 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1307                 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1308                 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1309                 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reass-feature-hoff",
1310         },
1311 };
1312 /* *INDENT-ON* */
1313
1314 /* *INDENT-OFF* */
1315 VNET_FEATURE_INIT (ip6_full_reassembly_feature, static) = {
1316     .arc_name = "ip6-unicast",
1317     .node_name = "ip6-full-reassembly-feature",
1318     .runs_before = VNET_FEATURES ("ip6-lookup",
1319                                   "ipsec6-input-feature"),
1320     .runs_after = 0,
1321 };
1322 /* *INDENT-ON* */
1323
1324 #ifndef CLIB_MARCH_VARIANT
1325 static u32
1326 ip6_full_reass_get_nbuckets ()
1327 {
1328   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1329   u32 nbuckets;
1330   u8 i;
1331
1332   nbuckets = (u32) (rm->max_reass_n / IP6_FULL_REASS_HT_LOAD_FACTOR);
1333
1334   for (i = 0; i < 31; i++)
1335     if ((1 << i) >= nbuckets)
1336       break;
1337   nbuckets = 1 << i;
1338
1339   return nbuckets;
1340 }
1341 #endif /* CLIB_MARCH_VARIANT */
1342
1343 typedef enum
1344 {
1345   IP6_EVENT_CONFIG_CHANGED = 1,
1346 } ip6_full_reass_event_t;
1347
1348 #ifndef CLIB_MARCH_VARIANT
1349 typedef struct
1350 {
1351   int failure;
1352   clib_bihash_48_8_t *new_hash;
1353 } ip6_rehash_cb_ctx;
1354
1355 static int
1356 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
1357 {
1358   ip6_rehash_cb_ctx *ctx = _ctx;
1359   if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
1360     {
1361       ctx->failure = 1;
1362     }
1363   return (BIHASH_WALK_CONTINUE);
1364 }
1365
1366 static void
1367 ip6_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1368                            u32 max_reassembly_length,
1369                            u32 expire_walk_interval_ms)
1370 {
1371   ip6_full_reass_main.timeout_ms = timeout_ms;
1372   ip6_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1373   ip6_full_reass_main.max_reass_n = max_reassemblies;
1374   ip6_full_reass_main.max_reass_len = max_reassembly_length;
1375   ip6_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1376 }
1377
1378 vnet_api_error_t
1379 ip6_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
1380                     u32 max_reassembly_length, u32 expire_walk_interval_ms)
1381 {
1382   u32 old_nbuckets = ip6_full_reass_get_nbuckets ();
1383   ip6_full_reass_set_params (timeout_ms, max_reassemblies,
1384                              max_reassembly_length, expire_walk_interval_ms);
1385   vlib_process_signal_event (ip6_full_reass_main.vlib_main,
1386                              ip6_full_reass_main.ip6_full_reass_expire_node_idx,
1387                              IP6_EVENT_CONFIG_CHANGED, 0);
1388   u32 new_nbuckets = ip6_full_reass_get_nbuckets ();
1389   if (ip6_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1390     {
1391       clib_bihash_48_8_t new_hash;
1392       clib_memset (&new_hash, 0, sizeof (new_hash));
1393       ip6_rehash_cb_ctx ctx;
1394       ctx.failure = 0;
1395       ctx.new_hash = &new_hash;
1396       clib_bihash_init_48_8 (&new_hash, "ip6-full-reass", new_nbuckets,
1397                              new_nbuckets * 1024);
1398       clib_bihash_foreach_key_value_pair_48_8 (&ip6_full_reass_main.hash,
1399                                                ip6_rehash_cb, &ctx);
1400       if (ctx.failure)
1401         {
1402           clib_bihash_free_48_8 (&new_hash);
1403           return -1;
1404         }
1405       else
1406         {
1407           clib_bihash_free_48_8 (&ip6_full_reass_main.hash);
1408           clib_memcpy_fast (&ip6_full_reass_main.hash, &new_hash,
1409                             sizeof (ip6_full_reass_main.hash));
1410           clib_bihash_copied (&ip6_full_reass_main.hash, &new_hash);
1411         }
1412     }
1413   return 0;
1414 }
1415
1416 vnet_api_error_t
1417 ip6_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1418                     u32 * max_reassembly_length,
1419                     u32 * expire_walk_interval_ms)
1420 {
1421   *timeout_ms = ip6_full_reass_main.timeout_ms;
1422   *max_reassemblies = ip6_full_reass_main.max_reass_n;
1423   *max_reassembly_length = ip6_full_reass_main.max_reass_len;
1424   *expire_walk_interval_ms = ip6_full_reass_main.expire_walk_interval_ms;
1425   return 0;
1426 }
1427
1428 static clib_error_t *
1429 ip6_full_reass_init_function (vlib_main_t * vm)
1430 {
1431   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1432   clib_error_t *error = 0;
1433   u32 nbuckets;
1434   vlib_node_t *node;
1435
1436   rm->vlib_main = vm;
1437
1438   vec_validate (rm->per_thread_data, vlib_num_workers ());
1439   ip6_full_reass_per_thread_t *rt;
1440   vec_foreach (rt, rm->per_thread_data)
1441   {
1442     clib_spinlock_init (&rt->lock);
1443     pool_alloc (rt->pool, rm->max_reass_n);
1444   }
1445
1446   node = vlib_get_node_by_name (vm, (u8 *) "ip6-full-reassembly-expire-walk");
1447   ASSERT (node);
1448   rm->ip6_full_reass_expire_node_idx = node->index;
1449
1450   ip6_full_reass_set_params (IP6_FULL_REASS_TIMEOUT_DEFAULT_MS,
1451                              IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT,
1452                              IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1453                              IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1454
1455   nbuckets = ip6_full_reass_get_nbuckets ();
1456   clib_bihash_init_48_8 (&rm->hash, "ip6-full-reass", nbuckets,
1457                          nbuckets * 1024);
1458
1459   node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
1460   ASSERT (node);
1461   rm->ip6_drop_idx = node->index;
1462   node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
1463   ASSERT (node);
1464   rm->ip6_icmp_error_idx = node->index;
1465
1466   if ((error = vlib_call_init_function (vm, ip_main_init)))
1467     return error;
1468   ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
1469                          ip6_full_reass_node.index);
1470
1471   rm->fq_index = vlib_frame_queue_main_init (ip6_full_reass_node.index, 0);
1472   rm->fq_feature_index =
1473     vlib_frame_queue_main_init (ip6_full_reass_node_feature.index, 0);
1474
1475   rm->feature_use_refcount_per_intf = NULL;
1476   return error;
1477 }
1478
1479 VLIB_INIT_FUNCTION (ip6_full_reass_init_function);
1480 #endif /* CLIB_MARCH_VARIANT */
1481
1482 static uword
1483 ip6_full_reass_walk_expired (vlib_main_t * vm,
1484                              vlib_node_runtime_t * node, vlib_frame_t * f)
1485 {
1486   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1487   uword event_type, *event_data = 0;
1488
1489   while (true)
1490     {
1491       vlib_process_wait_for_event_or_clock (vm,
1492                                             (f64) rm->expire_walk_interval_ms
1493                                             / (f64) MSEC_PER_SEC);
1494       event_type = vlib_process_get_events (vm, &event_data);
1495
1496       switch (event_type)
1497         {
1498         case ~0:                /* no events => timeout */
1499           /* nothing to do here */
1500           break;
1501         case IP6_EVENT_CONFIG_CHANGED:
1502           break;
1503         default:
1504           clib_warning ("BUG: event type 0x%wx", event_type);
1505           break;
1506         }
1507       f64 now = vlib_time_now (vm);
1508
1509       ip6_full_reass_t *reass;
1510       int *pool_indexes_to_free = NULL;
1511
1512       uword thread_index = 0;
1513       int index;
1514       const uword nthreads = vlib_num_workers () + 1;
1515       u32 *vec_icmp_bi = NULL;
1516       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1517         {
1518           ip6_full_reass_per_thread_t *rt =
1519             &rm->per_thread_data[thread_index];
1520           clib_spinlock_lock (&rt->lock);
1521
1522           vec_reset_length (pool_indexes_to_free);
1523           /* *INDENT-OFF* */
1524           pool_foreach_index (index, rt->pool, ({
1525                                 reass = pool_elt_at_index (rt->pool, index);
1526                                 if (now > reass->last_heard + rm->timeout)
1527                                   {
1528                                     vec_add1 (pool_indexes_to_free, index);
1529                                   }
1530                               }));
1531           /* *INDENT-ON* */
1532           int *i;
1533           /* *INDENT-OFF* */
1534           vec_foreach (i, pool_indexes_to_free)
1535           {
1536             ip6_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1537             u32 icmp_bi = ~0;
1538             ip6_full_reass_on_timeout (vm, node, rm, reass, &icmp_bi);
1539             if (~0 != icmp_bi)
1540               vec_add1 (vec_icmp_bi, icmp_bi);
1541
1542             ip6_full_reass_free (rm, rt, reass);
1543           }
1544           /* *INDENT-ON* */
1545
1546           clib_spinlock_unlock (&rt->lock);
1547         }
1548
1549       while (vec_len (vec_icmp_bi) > 0)
1550         {
1551           vlib_frame_t *f =
1552             vlib_get_frame_to_node (vm, rm->ip6_icmp_error_idx);
1553           u32 *to_next = vlib_frame_vector_args (f);
1554           u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
1555           int trace_frame = 0;
1556           while (vec_len (vec_icmp_bi) > 0 && n_left_to_next > 0)
1557             {
1558               u32 bi = vec_pop (vec_icmp_bi);
1559               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1560               if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1561                 trace_frame = 1;
1562               b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
1563               to_next[0] = bi;
1564               ++f->n_vectors;
1565               to_next += 1;
1566               n_left_to_next -= 1;
1567             }
1568           f->frame_flags |= (trace_frame * VLIB_FRAME_TRACE);
1569           vlib_put_frame_to_node (vm, rm->ip6_icmp_error_idx, f);
1570         }
1571
1572       vec_free (pool_indexes_to_free);
1573       vec_free (vec_icmp_bi);
1574       if (event_data)
1575         {
1576           _vec_len (event_data) = 0;
1577         }
1578     }
1579
1580   return 0;
1581 }
1582
1583 /* *INDENT-OFF* */
1584 VLIB_REGISTER_NODE (ip6_full_reass_expire_node) = {
1585     .function = ip6_full_reass_walk_expired,
1586     .format_trace = format_ip6_full_reass_trace,
1587     .type = VLIB_NODE_TYPE_PROCESS,
1588     .name = "ip6-full-reassembly-expire-walk",
1589
1590     .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1591     .error_strings = ip6_full_reassembly_error_strings,
1592
1593 };
1594 /* *INDENT-ON* */
1595
1596 static u8 *
1597 format_ip6_full_reass_key (u8 * s, va_list * args)
1598 {
1599   ip6_full_reass_key_t *key = va_arg (*args, ip6_full_reass_key_t *);
1600   s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1601               key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1602               &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1603   return s;
1604 }
1605
1606 static u8 *
1607 format_ip6_full_reass (u8 * s, va_list * args)
1608 {
1609   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1610   ip6_full_reass_t *reass = va_arg (*args, ip6_full_reass_t *);
1611
1612   s = format (s, "ID: %lu, key: %U\n  first_bi: %u, data_len: %u, "
1613               "last_packet_octet: %u, trace_op_counter: %u\n",
1614               reass->id, format_ip6_full_reass_key, &reass->key,
1615               reass->first_bi, reass->data_len, reass->last_packet_octet,
1616               reass->trace_op_counter);
1617   u32 bi = reass->first_bi;
1618   u32 counter = 0;
1619   while (~0 != bi)
1620     {
1621       vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1622       vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1623       s = format (s, "  #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1624                   "fragment[%u, %u]\n",
1625                   counter, vnb->ip.reass.range_first,
1626                   vnb->ip.reass.range_last, bi,
1627                   ip6_full_reass_buffer_get_data_offset (b),
1628                   ip6_full_reass_buffer_get_data_len (b),
1629                   vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1630       if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1631         {
1632           bi = b->next_buffer;
1633         }
1634       else
1635         {
1636           bi = ~0;
1637         }
1638     }
1639   return s;
1640 }
1641
1642 static clib_error_t *
1643 show_ip6_full_reass (vlib_main_t * vm, unformat_input_t * input,
1644                      CLIB_UNUSED (vlib_cli_command_t * lmd))
1645 {
1646   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1647
1648   vlib_cli_output (vm, "---------------------");
1649   vlib_cli_output (vm, "IP6 reassembly status");
1650   vlib_cli_output (vm, "---------------------");
1651   bool details = false;
1652   if (unformat (input, "details"))
1653     {
1654       details = true;
1655     }
1656
1657   u32 sum_reass_n = 0;
1658   u64 sum_buffers_n = 0;
1659   ip6_full_reass_t *reass;
1660   uword thread_index;
1661   const uword nthreads = vlib_num_workers () + 1;
1662   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1663     {
1664       ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1665       clib_spinlock_lock (&rt->lock);
1666       if (details)
1667         {
1668           /* *INDENT-OFF* */
1669           pool_foreach (reass, rt->pool, {
1670             vlib_cli_output (vm, "%U", format_ip6_full_reass, vm, reass);
1671           });
1672           /* *INDENT-ON* */
1673         }
1674       sum_reass_n += rt->reass_n;
1675       clib_spinlock_unlock (&rt->lock);
1676     }
1677   vlib_cli_output (vm, "---------------------");
1678   vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1679                    (long unsigned) sum_reass_n);
1680   vlib_cli_output (vm,
1681                    "Maximum configured concurrent full IP6 reassemblies per worker-thread: %lu\n",
1682                    (long unsigned) rm->max_reass_n);
1683   vlib_cli_output (vm,
1684                    "Maximum configured full IP6 reassembly timeout: %lums\n",
1685                    (long unsigned) rm->timeout_ms);
1686   vlib_cli_output (vm,
1687                    "Maximum configured full IP6 reassembly expire walk interval: %lums\n",
1688                    (long unsigned) rm->expire_walk_interval_ms);
1689   vlib_cli_output (vm, "Buffers in use: %lu\n",
1690                    (long unsigned) sum_buffers_n);
1691   return 0;
1692 }
1693
1694 /* *INDENT-OFF* */
1695 VLIB_CLI_COMMAND (show_ip6_full_reassembly_cmd, static) = {
1696     .path = "show ip6-full-reassembly",
1697     .short_help = "show ip6-full-reassembly [details]",
1698     .function = show_ip6_full_reass,
1699 };
1700 /* *INDENT-ON* */
1701
1702 #ifndef CLIB_MARCH_VARIANT
1703 vnet_api_error_t
1704 ip6_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1705 {
1706   return vnet_feature_enable_disable ("ip6-unicast",
1707                                       "ip6-full-reassembly-feature",
1708                                       sw_if_index, enable_disable, 0, 0);
1709 }
1710 #endif /* CLIB_MARCH_VARIANT */
1711
1712 #define foreach_ip6_full_reassembly_handoff_error                       \
1713 _(CONGESTION_DROP, "congestion drop")
1714
1715
1716 typedef enum
1717 {
1718 #define _(sym,str) IP6_FULL_REASSEMBLY_HANDOFF_ERROR_##sym,
1719   foreach_ip6_full_reassembly_handoff_error
1720 #undef _
1721     IP6_FULL_REASSEMBLY_HANDOFF_N_ERROR,
1722 } ip6_full_reassembly_handoff_error_t;
1723
1724 static char *ip6_full_reassembly_handoff_error_strings[] = {
1725 #define _(sym,string) string,
1726   foreach_ip6_full_reassembly_handoff_error
1727 #undef _
1728 };
1729
1730 typedef struct
1731 {
1732   u32 next_worker_index;
1733 } ip6_full_reassembly_handoff_trace_t;
1734
1735 static u8 *
1736 format_ip6_full_reassembly_handoff_trace (u8 * s, va_list * args)
1737 {
1738   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1739   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1740   ip6_full_reassembly_handoff_trace_t *t =
1741     va_arg (*args, ip6_full_reassembly_handoff_trace_t *);
1742
1743   s =
1744     format (s, "ip6-full-reassembly-handoff: next-worker %d",
1745             t->next_worker_index);
1746
1747   return s;
1748 }
1749
1750 always_inline uword
1751 ip6_full_reassembly_handoff_inline (vlib_main_t * vm,
1752                                     vlib_node_runtime_t * node,
1753                                     vlib_frame_t * frame, bool is_feature)
1754 {
1755   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1756
1757   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1758   u32 n_enq, n_left_from, *from;
1759   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1760   u32 fq_index;
1761
1762   from = vlib_frame_vector_args (frame);
1763   n_left_from = frame->n_vectors;
1764   vlib_get_buffers (vm, from, bufs, n_left_from);
1765
1766   b = bufs;
1767   ti = thread_indices;
1768
1769   fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1770
1771   while (n_left_from > 0)
1772     {
1773       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1774
1775       if (PREDICT_FALSE
1776           ((node->flags & VLIB_NODE_FLAG_TRACE)
1777            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1778         {
1779           ip6_full_reassembly_handoff_trace_t *t =
1780             vlib_add_trace (vm, node, b[0], sizeof (*t));
1781           t->next_worker_index = ti[0];
1782         }
1783
1784       n_left_from -= 1;
1785       ti += 1;
1786       b += 1;
1787     }
1788   n_enq =
1789     vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1790                                    frame->n_vectors, 1);
1791
1792   if (n_enq < frame->n_vectors)
1793     vlib_node_increment_counter (vm, node->node_index,
1794                                  IP6_FULL_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1795                                  frame->n_vectors - n_enq);
1796   return frame->n_vectors;
1797 }
1798
1799 VLIB_NODE_FN (ip6_full_reassembly_handoff_node) (vlib_main_t * vm,
1800                                                  vlib_node_runtime_t * node,
1801                                                  vlib_frame_t * frame)
1802 {
1803   return ip6_full_reassembly_handoff_inline (vm, node, frame,
1804                                              false /* is_feature */ );
1805 }
1806
1807 /* *INDENT-OFF* */
1808 VLIB_REGISTER_NODE (ip6_full_reassembly_handoff_node) = {
1809   .name = "ip6-full-reassembly-handoff",
1810   .vector_size = sizeof (u32),
1811   .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
1812   .error_strings = ip6_full_reassembly_handoff_error_strings,
1813   .format_trace = format_ip6_full_reassembly_handoff_trace,
1814
1815   .n_next_nodes = 1,
1816
1817   .next_nodes = {
1818     [0] = "error-drop",
1819   },
1820 };
1821
1822
1823 VLIB_NODE_FN (ip6_full_reassembly_feature_handoff_node) (vlib_main_t * vm,
1824                                vlib_node_runtime_t * node, vlib_frame_t * frame)
1825 {
1826   return ip6_full_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1827 }
1828
1829
1830 /* *INDENT-OFF* */
1831 VLIB_REGISTER_NODE (ip6_full_reassembly_feature_handoff_node) = {
1832   .name = "ip6-full-reass-feature-hoff",
1833   .vector_size = sizeof (u32),
1834   .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
1835   .error_strings = ip6_full_reassembly_handoff_error_strings,
1836   .format_trace = format_ip6_full_reassembly_handoff_trace,
1837
1838   .n_next_nodes = 1,
1839
1840   .next_nodes = {
1841     [0] = "error-drop",
1842   },
1843 };
1844 /* *INDENT-ON* */
1845
1846 #ifndef CLIB_MARCH_VARIANT
1847 int
1848 ip6_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1849 {
1850   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1851   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1852   if (is_enable)
1853     {
1854       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1855         {
1856           ++rm->feature_use_refcount_per_intf[sw_if_index];
1857           return vnet_feature_enable_disable ("ip6-unicast",
1858                                               "ip6-full-reassembly-feature",
1859                                               sw_if_index, 1, 0, 0);
1860         }
1861       ++rm->feature_use_refcount_per_intf[sw_if_index];
1862     }
1863   else
1864     {
1865       --rm->feature_use_refcount_per_intf[sw_if_index];
1866       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1867         return vnet_feature_enable_disable ("ip6-unicast",
1868                                             "ip6-full-reassembly-feature",
1869                                             sw_if_index, 0, 0, 0);
1870     }
1871   return -1;
1872 }
1873 #endif
1874
1875 /*
1876  * fd.io coding-style-patch-verification: ON
1877  *
1878  * Local Variables:
1879  * eval: (c-set-style "gnu")
1880  * End:
1881  */