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 100
  32 #define IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000    // 10 seconds default
  33 #define IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT 1024
  34 #define IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
  35 #define IP6_FULL_REASS_HT_LOAD_FACTOR (0.75)
  36
  37 typedef enum
  38 {
  39   IP6_FULL_REASS_RC_OK,
  40   IP6_FULL_REASS_RC_INTERNAL_ERROR,
  41   IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS,
  42   IP6_FULL_REASS_RC_NO_BUF,
  43   IP6_FULL_REASS_RC_HANDOFF,
  44 } ip6_full_reass_rc_t;
  45
  46 typedef struct
  47 {
  48   union
  49   {
  50     struct
  51     {
  52       ip6_address_t src;
  53       ip6_address_t dst;
  54       u32 xx_id;
  55       u32 frag_id;
  56       u8 unused[7];
  57       u8 proto;
  58     };
  59     u64 as_u64[6];
  60   };
  61 } ip6_full_reass_key_t;
  62
  63 typedef union
  64 {
  65   struct
  66   {
  67     u32 reass_index;
  68     u32 memory_owner_thread_index;
  69   };
  70   u64 as_u64;
  71 } ip6_full_reass_val_t;
  72
  73 typedef union
  74 {
  75   struct
  76   {
  77     ip6_full_reass_key_t k;
  78     ip6_full_reass_val_t v;
  79   };
  80   clib_bihash_kv_48_8_t kv;
  81 } ip6_full_reass_kv_t;
  82
  83
  84 always_inline u32
  85 ip6_full_reass_buffer_get_data_offset (vlib_buffer_t * b)
  86 {
  87   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
  88   return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first;
  89 }
  90
  91 always_inline u16
  92 ip6_full_reass_buffer_get_data_len (vlib_buffer_t * b)
  93 {
  94   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
  95   return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) -
  96     (vnb->ip.reass.fragment_first +
  97      ip6_full_reass_buffer_get_data_offset (b)) + 1;
  98 }
  99
 100 typedef struct
 101 {
 102   // hash table key
 103   ip6_full_reass_key_t key;
 104   // time when last packet was received
 105   f64 last_heard;
 106   // internal id of this reassembly
 107   u64 id;
 108   // buffer index of first buffer in this reassembly context
 109   u32 first_bi;
 110   // last octet of packet, ~0 until fragment without more_fragments arrives
 111   u32 last_packet_octet;
 112   // length of data collected so far
 113   u32 data_len;
 114   // trace operation counter
 115   u32 trace_op_counter;
 116   // next index - used by custom apps (~0 if not set)
 117   u32 next_index;
 118   // error next index - used by custom apps (~0 if not set)
 119   u32 error_next_index;
 120   // minimum fragment length for this reassembly - used to estimate MTU
 121   u16 min_fragment_length;
 122   // number of fragments for this reassembly
 123   u32 fragments_n;
 124   // thread owning memory for this context (whose pool contains this ctx)
 125   u32 memory_owner_thread_index;
 126   // thread which received fragment with offset 0 and which sends out the
 127   // completed reassembly
 128   u32 sendout_thread_index;
 129 } ip6_full_reass_t;
 130
 131 typedef struct
 132 {
 133   ip6_full_reass_t *pool;
 134   u32 reass_n;
 135   u32 id_counter;
 136   clib_spinlock_t lock;
 137 } ip6_full_reass_per_thread_t;
 138
 139 typedef struct
 140 {
 141   // IPv6 config
 142   u32 timeout_ms;
 143   f64 timeout;
 144   u32 expire_walk_interval_ms;
 145   // maximum number of fragments in one reassembly
 146   u32 max_reass_len;
 147   // maximum number of reassemblies
 148   u32 max_reass_n;
 149
 150   // IPv6 runtime
 151   clib_bihash_48_8_t hash;
 152
 153   // per-thread data
 154   ip6_full_reass_per_thread_t *per_thread_data;
 155
 156   // convenience
 157   vlib_main_t *vlib_main;
 158
 159   // node index of ip6-drop node
 160   u32 ip6_drop_idx;
 161   u32 ip6_icmp_error_idx;
 162   u32 ip6_full_reass_expire_node_idx;
 163
 164   /** Worker handoff */
 165   u32 fq_index;
 166   u32 fq_feature_index;
 167
 168   // reference count for enabling/disabling feature - per interface
 169   u32 *feature_use_refcount_per_intf;
 170 } ip6_full_reass_main_t;
 171
 172 extern ip6_full_reass_main_t ip6_full_reass_main;
 173
 174 #ifndef CLIB_MARCH_VARIANT
 175 ip6_full_reass_main_t ip6_full_reass_main;
 176 #endif /* CLIB_MARCH_VARIANT */
 177
 178 typedef enum
 179 {
 180   IP6_FULL_REASSEMBLY_NEXT_INPUT,
 181   IP6_FULL_REASSEMBLY_NEXT_DROP,
 182   IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR,
 183   IP6_FULL_REASSEMBLY_NEXT_HANDOFF,
 184   IP6_FULL_REASSEMBLY_N_NEXT,
 185 } ip6_full_reass_next_t;
 186
 187 typedef enum
 188 {
 189   RANGE_NEW,
 190   RANGE_OVERLAP,
 191   ICMP_ERROR_RT_EXCEEDED,
 192   ICMP_ERROR_FL_TOO_BIG,
 193   ICMP_ERROR_FL_NOT_MULT_8,
 194   FINALIZE,
 195   HANDOFF,
 196 } ip6_full_reass_trace_operation_e;
 197
 198 typedef struct
 199 {
 200   u16 range_first;
 201   u16 range_last;
 202   u32 range_bi;
 203   i32 data_offset;
 204   u32 data_len;
 205   u32 first_bi;
 206 } ip6_full_reass_range_trace_t;
 207
 208 typedef struct
 209 {
 210   ip6_full_reass_trace_operation_e action;
 211   u32 reass_id;
 212   ip6_full_reass_range_trace_t trace_range;
 213   u32 op_id;
 214   u32 fragment_first;
 215   u32 fragment_last;
 216   u32 total_data_len;
 217   u32 thread_id;
 218   u32 thread_id_to;
 219   bool is_after_handoff;
 220   ip6_header_t ip6_header;
 221   ip6_frag_hdr_t ip6_frag_header;
 222 } ip6_full_reass_trace_t;
 223
 224 static void
 225 ip6_full_reass_trace_details (vlib_main_t * vm, u32 bi,
 226                               ip6_full_reass_range_trace_t * trace)
 227 {
 228   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 229   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 230   trace->range_first = vnb->ip.reass.range_first;
 231   trace->range_last = vnb->ip.reass.range_last;
 232   trace->data_offset = ip6_full_reass_buffer_get_data_offset (b);
 233   trace->data_len = ip6_full_reass_buffer_get_data_len (b);
 234   trace->range_bi = bi;
 235 }
 236
 237 static u8 *
 238 format_ip6_full_reass_range_trace (u8 * s, va_list * args)
 239 {
 240   ip6_full_reass_range_trace_t *trace =
 241     va_arg (*args, ip6_full_reass_range_trace_t *);
 242   s =
 243     format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
 244             trace->range_last, trace->data_offset, trace->data_len,
 245             trace->range_bi);
 246   return s;
 247 }
 248
 249 static u8 *
 250 format_ip6_full_reass_trace (u8 * s, va_list * args)
 251 {
 252   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 253   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 254   ip6_full_reass_trace_t *t = va_arg (*args, ip6_full_reass_trace_t *);
 255   u32 indent = 0;
 256   if (~0 != t->reass_id)
 257     {
 258       if (t->is_after_handoff)
 259         {
 260           s =
 261             format (s, "%U\n", format_ip6_header, &t->ip6_header,
 262                     sizeof (t->ip6_header));
 263           s =
 264             format (s, "  %U\n", format_ip6_frag_hdr, &t->ip6_frag_header,
 265                     sizeof (t->ip6_frag_header));
 266           indent = 2;
 267         }
 268       s =
 269         format (s, "%Ureass id: %u, op id: %u, ", format_white_space, indent,
 270                 t->reass_id, t->op_id);
 271       indent = format_get_indent (s);
 272       s = format (s, "first bi: %u, data len: %u, ip/fragment[%u, %u]",
 273                   t->trace_range.first_bi, t->total_data_len,
 274                   t->fragment_first, t->fragment_last);
 275     }
 276   switch (t->action)
 277     {
 278     case RANGE_NEW:
 279       s = format (s, "\n%Unew %U", format_white_space, indent,
 280                   format_ip6_full_reass_range_trace, &t->trace_range);
 281       break;
 282     case RANGE_OVERLAP:
 283       s = format (s, "\n%Uoverlap %U", format_white_space, indent,
 284                   format_ip6_full_reass_range_trace, &t->trace_range);
 285       break;
 286     case ICMP_ERROR_FL_TOO_BIG:
 287       s = format (s, "\n%Uicmp-error - frag_len > 65535 %U",
 288                   format_white_space, indent,
 289                   format_ip6_full_reass_range_trace, &t->trace_range);
 290       break;
 291     case ICMP_ERROR_FL_NOT_MULT_8:
 292       s = format (s, "\n%Uicmp-error - frag_len mod 8 != 0 %U",
 293                   format_white_space, indent,
 294                   format_ip6_full_reass_range_trace, &t->trace_range);
 295       break;
 296     case ICMP_ERROR_RT_EXCEEDED:
 297       s = format (s, "\n%Uicmp-error - reassembly time exceeded",
 298                   format_white_space, indent);
 299       break;
 300     case FINALIZE:
 301       s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
 302       break;
 303     case HANDOFF:
 304       s =
 305         format (s, "handoff from thread #%u to thread #%u", t->thread_id,
 306                 t->thread_id_to);
 307       break;
 308     }
 309   return s;
 310 }
 311
 312 static void
 313 ip6_full_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 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 (pool_is_free_index
 323       (vm->trace_main.trace_buffer_pool, vlib_buffer_get_trace_index (b)))
 324     {
 325       // this buffer's trace is gone
 326       b->flags &= ~VLIB_BUFFER_IS_TRACED;
 327       return;
 328     }
 329   if (vlib_buffer_get_trace_thread (b) != vm->thread_index)
 330     {
 331       is_after_handoff = true;
 332     }
 333   ip6_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 334   t->is_after_handoff = is_after_handoff;
 335   if (t->is_after_handoff)
 336     {
 337       clib_memcpy (&t->ip6_header, vlib_buffer_get_current (b),
 338                    clib_min (sizeof (t->ip6_header), b->current_length));
 339       if (ip6_frag_header)
 340         {
 341           clib_memcpy (&t->ip6_frag_header, ip6_frag_header,
 342                        sizeof (t->ip6_frag_header));
 343         }
 344       else
 345         {
 346           clib_memset (&t->ip6_frag_header, 0, sizeof (t->ip6_frag_header));
 347         }
 348     }
 349   if (reass)
 350     {
 351       t->reass_id = reass->id;
 352       t->op_id = reass->trace_op_counter;
 353       t->trace_range.first_bi = reass->first_bi;
 354       t->total_data_len = reass->data_len;
 355       ++reass->trace_op_counter;
 356     }
 357   else
 358     {
 359       t->reass_id = ~0;
 360     }
 361   t->action = action;
 362   t->thread_id = vm->thread_index;
 363   t->thread_id_to = thread_id_to;
 364   ip6_full_reass_trace_details (vm, bi, &t->trace_range);
 365   t->fragment_first = vnb->ip.reass.fragment_first;
 366   t->fragment_last = vnb->ip.reass.fragment_last;
 367 #if 0
 368   static u8 *s = NULL;
 369   s = format (s, "%U", format_ip6_full_reass_trace, NULL, NULL, t);
 370   printf ("%.*s\n", vec_len (s), s);
 371   fflush (stdout);
 372   vec_reset_length (s);
 373 #endif
 374 }
 375
 376 always_inline void
 377 ip6_full_reass_free_ctx (ip6_full_reass_per_thread_t * rt,
 378                          ip6_full_reass_t * reass)
 379 {
 380   pool_put (rt->pool, reass);
 381   --rt->reass_n;
 382 }
 383
 384 always_inline void
 385 ip6_full_reass_free (ip6_full_reass_main_t * rm,
 386                      ip6_full_reass_per_thread_t * rt,
 387                      ip6_full_reass_t * reass)
 388 {
 389   clib_bihash_kv_48_8_t kv;
 390   kv.key[0] = reass->key.as_u64[0];
 391   kv.key[1] = reass->key.as_u64[1];
 392   kv.key[2] = reass->key.as_u64[2];
 393   kv.key[3] = reass->key.as_u64[3];
 394   kv.key[4] = reass->key.as_u64[4];
 395   kv.key[5] = reass->key.as_u64[5];
 396   clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
 397   ip6_full_reass_free_ctx (rt, reass);
 398 }
 399
 400 always_inline void
 401 ip6_full_reass_drop_all (vlib_main_t *vm, vlib_node_runtime_t *node,
 402                          ip6_full_reass_t *reass)
 403 {
 404   u32 range_bi = reass->first_bi;
 405   vlib_buffer_t *range_b;
 406   vnet_buffer_opaque_t *range_vnb;
 407   u32 *to_free = NULL;
 408   while (~0 != range_bi)
 409     {
 410       range_b = vlib_get_buffer (vm, range_bi);
 411       range_vnb = vnet_buffer (range_b);
 412       u32 bi = range_bi;
 413       while (~0 != bi)
 414         {
 415           vec_add1 (to_free, bi);
 416           vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 417           if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 418             {
 419               bi = b->next_buffer;
 420               b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 421             }
 422           else
 423             {
 424               bi = ~0;
 425             }
 426         }
 427       range_bi = range_vnb->ip.reass.next_range_bi;
 428     }
 429   /* send to next_error_index */
 430   if (~0 != reass->error_next_index)
 431     {
 432       u32 n_left_to_next, *to_next, next_index;
 433
 434       next_index = reass->error_next_index;
 435       u32 bi = ~0;
 436
 437       while (vec_len (to_free) > 0)
 438         {
 439           vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 440
 441           while (vec_len (to_free) > 0 && n_left_to_next > 0)
 442             {
 443               bi = vec_pop (to_free);
 444
 445               if (~0 != bi)
 446                 {
 447                   to_next[0] = bi;
 448                   to_next += 1;
 449                   n_left_to_next -= 1;
 450                 }
 451             }
 452           vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 453         }
 454     }
 455   else
 456     {
 457       vlib_buffer_free (vm, to_free, vec_len (to_free));
 458     }
 459   vec_free (to_free);
 460 }
 461
 462 always_inline void
 463 ip6_full_reass_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * node,
 464                            ip6_full_reass_t * reass, u32 * icmp_bi)
 465 {
 466   if (~0 == reass->first_bi)
 467     {
 468       return;
 469     }
 470   if (~0 == reass->next_index)  // custom apps don't want icmp
 471     {
 472       vlib_buffer_t *b = vlib_get_buffer (vm, reass->first_bi);
 473       if (0 == vnet_buffer (b)->ip.reass.fragment_first)
 474         {
 475           *icmp_bi = reass->first_bi;
 476           if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
 477             {
 478               ip6_full_reass_add_trace (vm, node, reass, reass->first_bi, NULL,
 479                                         ICMP_ERROR_RT_EXCEEDED, ~0);
 480             }
 481           // fragment with offset zero received - send icmp message back
 482           if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 483             {
 484               // separate first buffer from chain and steer it towards icmp node
 485               b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 486               reass->first_bi = b->next_buffer;
 487             }
 488           else
 489             {
 490               reass->first_bi = vnet_buffer (b)->ip.reass.next_range_bi;
 491             }
 492           icmp6_error_set_vnet_buffer (b, ICMP6_time_exceeded,
 493                                        ICMP6_time_exceeded_fragment_reassembly_time_exceeded,
 494                                        0);
 495         }
 496     }
 497   ip6_full_reass_drop_all (vm, node, reass);
 498 }
 499
 500 always_inline ip6_full_reass_t *
 501 ip6_full_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
 502                                ip6_full_reass_main_t * rm,
 503                                ip6_full_reass_per_thread_t * rt,
 504                                ip6_full_reass_kv_t * kv, u32 * icmp_bi,
 505                                u8 * do_handoff)
 506 {
 507   ip6_full_reass_t *reass;
 508   f64 now;
 509
 510 again:
 511
 512   reass = NULL;
 513   now = vlib_time_now (vm);
 514
 515   if (!clib_bihash_search_48_8 (&rm->hash, &kv->kv, &kv->kv))
 516     {
 517       if (vm->thread_index != kv->v.memory_owner_thread_index)
 518         {
 519           *do_handoff = 1;
 520           return NULL;
 521         }
 522
 523       reass =
 524         pool_elt_at_index (rm->per_thread_data
 525                            [kv->v.memory_owner_thread_index].pool,
 526                            kv->v.reass_index);
 527
 528       if (now > reass->last_heard + rm->timeout)
 529         {
 530           ip6_full_reass_on_timeout (vm, node, reass, icmp_bi);
 531           ip6_full_reass_free (rm, rt, reass);
 532           reass = NULL;
 533         }
 534     }
 535
 536   if (reass)
 537     {
 538       reass->last_heard = now;
 539       return reass;
 540     }
 541
 542   if (rt->reass_n >= rm->max_reass_n)
 543     {
 544       reass = NULL;
 545       return reass;
 546     }
 547   else
 548     {
 549       pool_get (rt->pool, reass);
 550       clib_memset (reass, 0, sizeof (*reass));
 551       reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 552       ++rt->id_counter;
 553       reass->first_bi = ~0;
 554       reass->last_packet_octet = ~0;
 555       reass->data_len = 0;
 556       reass->next_index = ~0;
 557       reass->error_next_index = ~0;
 558       ++rt->reass_n;
 559     }
 560
 561   reass->key.as_u64[0] = kv->kv.key[0];
 562   reass->key.as_u64[1] = kv->kv.key[1];
 563   reass->key.as_u64[2] = kv->kv.key[2];
 564   reass->key.as_u64[3] = kv->kv.key[3];
 565   reass->key.as_u64[4] = kv->kv.key[4];
 566   reass->key.as_u64[5] = kv->kv.key[5];
 567   kv->v.reass_index = (reass - rt->pool);
 568   kv->v.memory_owner_thread_index = vm->thread_index;
 569   reass->last_heard = now;
 570
 571   int rv = clib_bihash_add_del_48_8 (&rm->hash, &kv->kv, 2);
 572   if (rv)
 573     {
 574       ip6_full_reass_free (rm, rt, reass);
 575       reass = NULL;
 576       // if other worker created a context already work with the other copy
 577       if (-2 == rv)
 578         goto again;
 579     }
 580
 581   return reass;
 582 }
 583
 584 always_inline ip6_full_reass_rc_t
 585 ip6_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
 586                          ip6_full_reass_main_t * rm,
 587                          ip6_full_reass_per_thread_t * rt,
 588                          ip6_full_reass_t * reass, u32 * bi0, u32 * next0,
 589                          u32 * error0, bool is_custom_app)
 590 {
 591   *bi0 = reass->first_bi;
 592   *error0 = IP6_ERROR_NONE;
 593   ip6_frag_hdr_t *frag_hdr;
 594   vlib_buffer_t *last_b = NULL;
 595   u32 sub_chain_bi = reass->first_bi;
 596   u32 total_length = 0;
 597   u32 buf_cnt = 0;
 598   u32 dropped_cnt = 0;
 599   u32 *vec_drop_compress = NULL;
 600   ip6_full_reass_rc_t rv = IP6_FULL_REASS_RC_OK;
 601   do
 602     {
 603       u32 tmp_bi = sub_chain_bi;
 604       vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
 605       vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
 606       if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 607           !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 608         {
 609           rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 610           goto free_buffers_and_return;
 611         }
 612
 613       u32 data_len = ip6_full_reass_buffer_get_data_len (tmp);
 614       u32 trim_front = vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
 615         sizeof (*frag_hdr) + ip6_full_reass_buffer_get_data_offset (tmp);
 616       u32 trim_end =
 617         vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
 618       if (tmp_bi == reass->first_bi)
 619         {
 620           /* first buffer - keep ip6 header */
 621           if (0 != ip6_full_reass_buffer_get_data_offset (tmp))
 622             {
 623               rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 624               goto free_buffers_and_return;
 625             }
 626           trim_front = 0;
 627           trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
 628             (vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
 629              sizeof (*frag_hdr));
 630           if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
 631             {
 632               rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 633               goto free_buffers_and_return;
 634             }
 635         }
 636       u32 keep_data =
 637         vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
 638       while (1)
 639         {
 640           ++buf_cnt;
 641           if (trim_front)
 642             {
 643               if (trim_front > tmp->current_length)
 644                 {
 645                   /* drop whole buffer */
 646                   vec_add1 (vec_drop_compress, tmp_bi);
 647                   trim_front -= tmp->current_length;
 648                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 649                     {
 650                       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 651                       goto free_buffers_and_return;
 652                     }
 653                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 654                   tmp_bi = tmp->next_buffer;
 655                   tmp = vlib_get_buffer (vm, tmp_bi);
 656                   continue;
 657                 }
 658               else
 659                 {
 660                   vlib_buffer_advance (tmp, trim_front);
 661                   trim_front = 0;
 662                 }
 663             }
 664           if (keep_data)
 665             {
 666               if (last_b)
 667                 {
 668                   last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
 669                   last_b->next_buffer = tmp_bi;
 670                 }
 671               last_b = tmp;
 672               if (keep_data <= tmp->current_length)
 673                 {
 674                   tmp->current_length = keep_data;
 675                   keep_data = 0;
 676                 }
 677               else
 678                 {
 679                   keep_data -= tmp->current_length;
 680                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 681                     {
 682                       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 683                       goto free_buffers_and_return;
 684                     }
 685                 }
 686               total_length += tmp->current_length;
 687             }
 688           else
 689             {
 690               vec_add1 (vec_drop_compress, tmp_bi);
 691               if (reass->first_bi == tmp_bi)
 692                 {
 693                   rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 694                   goto free_buffers_and_return;
 695                 }
 696               ++dropped_cnt;
 697             }
 698           if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 699             {
 700               tmp_bi = tmp->next_buffer;
 701               tmp = vlib_get_buffer (vm, tmp->next_buffer);
 702             }
 703           else
 704             {
 705               break;
 706             }
 707         }
 708       sub_chain_bi =
 709         vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
 710         reass.next_range_bi;
 711     }
 712   while (~0 != sub_chain_bi);
 713
 714   if (!last_b)
 715     {
 716       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 717       goto free_buffers_and_return;
 718     }
 719   last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 720   vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
 721   if (total_length < first_b->current_length)
 722     {
 723       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 724       goto free_buffers_and_return;
 725     }
 726   total_length -= first_b->current_length;
 727   first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
 728   first_b->total_length_not_including_first_buffer = total_length;
 729   // drop fragment header
 730   vnet_buffer_opaque_t *first_b_vnb = vnet_buffer (first_b);
 731   ip6_header_t *ip = vlib_buffer_get_current (first_b);
 732   u16 ip6_frag_hdr_offset = first_b_vnb->ip.reass.ip6_frag_hdr_offset;
 733   ip6_ext_hdr_chain_t hdr_chain;
 734   ip6_ext_header_t *prev_hdr = 0;
 735   int res = ip6_ext_header_walk (first_b, ip, IP_PROTOCOL_IPV6_FRAGMENTATION,
 736                                  &hdr_chain);
 737   if (res < 0 ||
 738       (hdr_chain.eh[res].protocol != IP_PROTOCOL_IPV6_FRAGMENTATION))
 739     {
 740       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 741       goto free_buffers_and_return;
 742     }
 743   frag_hdr = ip6_ext_next_header_offset (ip, hdr_chain.eh[res].offset);
 744   if (res > 0)
 745     {
 746       prev_hdr = ip6_ext_next_header_offset (ip, hdr_chain.eh[res - 1].offset);
 747       prev_hdr->next_hdr = frag_hdr->next_hdr;
 748     }
 749   else
 750     {
 751       ip->protocol = frag_hdr->next_hdr;
 752     }
 753   if (hdr_chain.eh[res].offset != ip6_frag_hdr_offset)
 754     {
 755       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 756       goto free_buffers_and_return;
 757     }
 758   memmove (frag_hdr, (u8 *) frag_hdr + sizeof (*frag_hdr),
 759            first_b->current_length - ip6_frag_hdr_offset -
 760            sizeof (ip6_frag_hdr_t));
 761   first_b->current_length -= sizeof (*frag_hdr);
 762   ip->payload_length =
 763     clib_host_to_net_u16 (total_length + first_b->current_length -
 764                           sizeof (*ip));
 765   if (!vlib_buffer_chain_linearize (vm, first_b))
 766     {
 767       rv = IP6_FULL_REASS_RC_NO_BUF;
 768       goto free_buffers_and_return;
 769     }
 770   first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
 771   if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
 772     {
 773       ip6_full_reass_add_trace (vm, node, reass, reass->first_bi, NULL,
 774                                 FINALIZE, ~0);
 775 #if 0
 776       // following code does a hexdump of packet fragments to stdout ...
 777       do
 778         {
 779           u32 bi = reass->first_bi;
 780           u8 *s = NULL;
 781           while (~0 != bi)
 782             {
 783               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 784               s = format (s, "%u: %U\n", bi, format_hexdump,
 785                           vlib_buffer_get_current (b), b->current_length);
 786               if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 787                 {
 788                   bi = b->next_buffer;
 789                 }
 790               else
 791                 {
 792                   break;
 793                 }
 794             }
 795           printf ("%.*s\n", vec_len (s), s);
 796           fflush (stdout);
 797           vec_free (s);
 798         }
 799       while (0);
 800 #endif
 801     }
 802   if (!is_custom_app)
 803     {
 804       *next0 = IP6_FULL_REASSEMBLY_NEXT_INPUT;
 805     }
 806   else
 807     {
 808       *next0 = reass->next_index;
 809     }
 810   vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
 811   ip6_full_reass_free (rm, rt, reass);
 812   reass = NULL;
 813 free_buffers_and_return:
 814   vlib_buffer_free (vm, vec_drop_compress, vec_len (vec_drop_compress));
 815   vec_free (vec_drop_compress);
 816   return rv;
 817 }
 818
 819 always_inline void
 820 ip6_full_reass_insert_range_in_chain (vlib_main_t * vm,
 821                                       ip6_full_reass_t * reass,
 822                                       u32 prev_range_bi, u32 new_next_bi)
 823 {
 824
 825   vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
 826   vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
 827   if (~0 != prev_range_bi)
 828     {
 829       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 830       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 831       new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
 832       prev_vnb->ip.reass.next_range_bi = new_next_bi;
 833     }
 834   else
 835     {
 836       if (~0 != reass->first_bi)
 837         {
 838           new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
 839         }
 840       reass->first_bi = new_next_bi;
 841     }
 842   reass->data_len += ip6_full_reass_buffer_get_data_len (new_next_b);
 843 }
 844
 845 always_inline ip6_full_reass_rc_t
 846 ip6_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 847                        ip6_full_reass_main_t * rm,
 848                        ip6_full_reass_per_thread_t * rt,
 849                        ip6_full_reass_t * reass, u32 * bi0, u32 * next0,
 850                        u32 * error0, ip6_frag_hdr_t * frag_hdr,
 851                        bool is_custom_app, u32 * handoff_thread_idx)
 852 {
 853   int consumed = 0;
 854   vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
 855   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 856   if (is_custom_app)
 857     {
 858       reass->next_index = fvnb->ip.reass.next_index;    // store next_index before it's overwritten
 859       reass->error_next_index = fvnb->ip.reass.error_next_index;        // store error_next_index before it is overwritten
 860     }
 861
 862   fvnb->ip.reass.ip6_frag_hdr_offset =
 863     (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
 864   ip6_header_t *fip = vlib_buffer_get_current (fb);
 865   if (fb->current_length < sizeof (*fip) ||
 866       fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
 867       fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
 868     {
 869       return IP6_FULL_REASS_RC_INTERNAL_ERROR;
 870     }
 871
 872   u32 fragment_first = fvnb->ip.reass.fragment_first =
 873     ip6_frag_hdr_offset_bytes (frag_hdr);
 874   u32 fragment_length =
 875     vlib_buffer_length_in_chain (vm, fb) -
 876     (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 877   u32 fragment_last = fvnb->ip.reass.fragment_last =
 878     fragment_first + fragment_length - 1;
 879   int more_fragments = ip6_frag_hdr_more (frag_hdr);
 880   u32 candidate_range_bi = reass->first_bi;
 881   u32 prev_range_bi = ~0;
 882   fvnb->ip.reass.range_first = fragment_first;
 883   fvnb->ip.reass.range_last = fragment_last;
 884   fvnb->ip.reass.next_range_bi = ~0;
 885   if (!more_fragments)
 886     {
 887       reass->last_packet_octet = fragment_last;
 888     }
 889   if (~0 == reass->first_bi)
 890     {
 891       // starting a new reassembly
 892       ip6_full_reass_insert_range_in_chain (vm, reass, prev_range_bi, *bi0);
 893       reass->min_fragment_length = clib_net_to_host_u16 (fip->payload_length);
 894       consumed = 1;
 895       reass->fragments_n = 1;
 896       goto check_if_done_maybe;
 897     }
 898   reass->min_fragment_length =
 899     clib_min (clib_net_to_host_u16 (fip->payload_length),
 900               fvnb->ip.reass.estimated_mtu);
 901   while (~0 != candidate_range_bi)
 902     {
 903       vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
 904       vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
 905       if (fragment_first > candidate_vnb->ip.reass.range_last)
 906         {
 907           // this fragments starts after candidate range
 908           prev_range_bi = candidate_range_bi;
 909           candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
 910           if (candidate_vnb->ip.reass.range_last < fragment_last &&
 911               ~0 == candidate_range_bi)
 912             {
 913               // special case - this fragment falls beyond all known ranges
 914               ip6_full_reass_insert_range_in_chain (vm, reass, prev_range_bi,
 915                                                     *bi0);
 916               consumed = 1;
 917               break;
 918             }
 919           continue;
 920         }
 921       if (fragment_last < candidate_vnb->ip.reass.range_first)
 922         {
 923           // this fragment ends before candidate range without any overlap
 924           ip6_full_reass_insert_range_in_chain (vm, reass, prev_range_bi,
 925                                                 *bi0);
 926           consumed = 1;
 927         }
 928       else if (fragment_first == candidate_vnb->ip.reass.range_first &&
 929                fragment_last == candidate_vnb->ip.reass.range_last)
 930         {
 931           // duplicate fragment - ignore
 932         }
 933       else
 934         {
 935           // overlapping fragment - not allowed by RFC 8200
 936           if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 937             {
 938               ip6_full_reass_add_trace (vm, node, reass, *bi0, frag_hdr,
 939                                         RANGE_OVERLAP, ~0);
 940             }
 941           ip6_full_reass_drop_all (vm, node, reass);
 942           ip6_full_reass_free (rm, rt, reass);
 943           *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
 944           *error0 = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT;
 945           return IP6_FULL_REASS_RC_OK;
 946         }
 947       break;
 948     }
 949   ++reass->fragments_n;
 950 check_if_done_maybe:
 951   if (consumed)
 952     {
 953       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 954         {
 955           ip6_full_reass_add_trace (vm, node, reass, *bi0, frag_hdr, RANGE_NEW,
 956                                     ~0);
 957         }
 958     }
 959   if (~0 != reass->last_packet_octet &&
 960       reass->data_len == reass->last_packet_octet + 1)
 961     {
 962       *handoff_thread_idx = reass->sendout_thread_index;
 963       int handoff =
 964         reass->memory_owner_thread_index != reass->sendout_thread_index;
 965       ip6_full_reass_rc_t rc =
 966         ip6_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
 967                                  is_custom_app);
 968       if (IP6_FULL_REASS_RC_OK == rc && handoff)
 969         {
 970           return IP6_FULL_REASS_RC_HANDOFF;
 971         }
 972       return rc;
 973     }
 974   else
 975     {
 976       if (consumed)
 977         {
 978           *bi0 = ~0;
 979           if (reass->fragments_n > rm->max_reass_len)
 980             {
 981               return IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS;
 982             }
 983         }
 984       else
 985         {
 986           *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
 987           *error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT;
 988         }
 989     }
 990   return IP6_FULL_REASS_RC_OK;
 991 }
 992
 993 always_inline bool
 994 ip6_full_reass_verify_upper_layer_present (vlib_node_runtime_t *node,
 995                                            vlib_buffer_t *b,
 996                                            ip6_ext_hdr_chain_t *hc)
 997 {
 998   int nh = hc->eh[hc->length - 1].protocol;
 999   /* Checking to see if it's a terminating header */
1000   if (ip6_ext_hdr (nh))
1001     {
1002       icmp6_error_set_vnet_buffer (
1003         b, ICMP6_parameter_problem,
1004         ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain, 0);
1005       b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
1006       return false;
1007     }
1008   return true;
1009 }
1010
1011 always_inline bool
1012 ip6_full_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
1013                                            vlib_buffer_t * b,
1014                                            ip6_frag_hdr_t * frag_hdr)
1015 {
1016   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1017   ip6_header_t *ip = vlib_buffer_get_current (b);
1018   int more_fragments = ip6_frag_hdr_more (frag_hdr);
1019   u32 fragment_length =
1020     vlib_buffer_length_in_chain (vm, b) -
1021     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
1022   if (more_fragments && 0 != fragment_length % 8)
1023     {
1024       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
1025                                    ICMP6_parameter_problem_erroneous_header_field,
1026                                    (u8 *) & ip->payload_length - (u8 *) ip);
1027       return false;
1028     }
1029   return true;
1030 }
1031
1032 always_inline bool
1033 ip6_full_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
1034                                           vlib_buffer_t * b,
1035                                           ip6_frag_hdr_t * frag_hdr)
1036 {
1037   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1038   u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
1039   u32 fragment_length =
1040     vlib_buffer_length_in_chain (vm, b) -
1041     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
1042   if (fragment_first + fragment_length > 65535)
1043     {
1044       ip6_header_t *ip0 = vlib_buffer_get_current (b);
1045       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
1046                                    ICMP6_parameter_problem_erroneous_header_field,
1047                                    (u8 *) & frag_hdr->fragment_offset_and_more
1048                                    - (u8 *) ip0);
1049       return false;
1050     }
1051   return true;
1052 }
1053
1054 always_inline uword
1055 ip6_full_reassembly_inline (vlib_main_t * vm,
1056                             vlib_node_runtime_t * node,
1057                             vlib_frame_t * frame, bool is_feature,
1058                             bool is_custom_app)
1059 {
1060   u32 *from = vlib_frame_vector_args (frame);
1061   u32 n_left_from, n_left_to_next, *to_next, next_index;
1062   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1063   ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1064   clib_spinlock_lock (&rt->lock);
1065
1066   n_left_from = frame->n_vectors;
1067   next_index = node->cached_next_index;
1068   while (n_left_from > 0)
1069     {
1070       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1071
1072       while (n_left_from > 0 && n_left_to_next > 0)
1073         {
1074           u32 bi0;
1075           vlib_buffer_t *b0;
1076           u32 next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1077           u32 error0 = IP6_ERROR_NONE;
1078           u32 icmp_bi = ~0;
1079
1080           bi0 = from[0];
1081           b0 = vlib_get_buffer (vm, bi0);
1082
1083           ip6_header_t *ip0 = vlib_buffer_get_current (b0);
1084           ip6_frag_hdr_t *frag_hdr;
1085           ip6_ext_hdr_chain_t hdr_chain;
1086           int res = ip6_ext_header_walk (
1087             b0, ip0, IP_PROTOCOL_IPV6_FRAGMENTATION, &hdr_chain);
1088           if (res < 0 ||
1089               hdr_chain.eh[res].protocol != IP_PROTOCOL_IPV6_FRAGMENTATION)
1090             {
1091               // this is a mangled packet - no fragmentation
1092               next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1093               goto skip_reass;
1094             }
1095           frag_hdr =
1096             ip6_ext_next_header_offset (ip0, hdr_chain.eh[res].offset);
1097           vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
1098             hdr_chain.eh[res].offset;
1099
1100           if (0 == ip6_frag_hdr_offset (frag_hdr))
1101             {
1102               // first fragment - verify upper-layer is present
1103               if (!ip6_full_reass_verify_upper_layer_present (node, b0,
1104                                                               &hdr_chain))
1105                 {
1106                   next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1107                   goto skip_reass;
1108                 }
1109             }
1110           if (!ip6_full_reass_verify_fragment_multiple_8 (vm, b0, frag_hdr) ||
1111               !ip6_full_reass_verify_packet_size_lt_64k (vm, b0, 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               u32 counter = ~0;
1151               switch (ip6_full_reass_update
1152                       (vm, node, rm, rt, reass, &bi0, &next0, &error0,
1153                        frag_hdr, is_custom_app, &handoff_thread_idx))
1154                 {
1155                 case IP6_FULL_REASS_RC_OK:
1156                   /* nothing to do here */
1157                   break;
1158                 case IP6_FULL_REASS_RC_HANDOFF:
1159                   next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
1160                   b0 = vlib_get_buffer (vm, bi0);
1161                   vnet_buffer (b0)->ip.reass.owner_thread_index =
1162                     handoff_thread_idx;
1163                   break;
1164                 case IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS:
1165                   counter = IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG;
1166                   break;
1167                 case IP6_FULL_REASS_RC_NO_BUF:
1168                   counter = IP6_ERROR_REASS_NO_BUF;
1169                   break;
1170                 case IP6_FULL_REASS_RC_INTERNAL_ERROR:
1171                   counter = IP6_ERROR_REASS_INTERNAL_ERROR;
1172                   break;
1173                 }
1174               if (~0 != counter)
1175                 {
1176                   vlib_node_increment_counter (vm, node->node_index, counter,
1177                                                1);
1178                   ip6_full_reass_drop_all (vm, node, reass);
1179                   ip6_full_reass_free (rm, rt, reass);
1180                   goto next_packet;
1181                 }
1182             }
1183           else
1184             {
1185               if (is_feature)
1186                 {
1187                   next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1188                 }
1189               else
1190                 {
1191                   vnet_buffer_opaque_t *fvnb = vnet_buffer (b0);
1192                   next0 = fvnb->ip.reass.error_next_index;
1193                 }
1194               error0 = IP6_ERROR_REASS_LIMIT_REACHED;
1195             }
1196
1197           if (~0 != bi0)
1198             {
1199             skip_reass:
1200               to_next[0] = bi0;
1201               to_next += 1;
1202               n_left_to_next -= 1;
1203
1204               /* bi0 might have been updated by reass_finalize, reload */
1205               b0 = vlib_get_buffer (vm, bi0);
1206               if (IP6_ERROR_NONE != error0)
1207                 {
1208                   b0->error = node->errors[error0];
1209                 }
1210
1211               if (next0 == IP6_FULL_REASSEMBLY_NEXT_HANDOFF)
1212                 {
1213                   if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1214                     {
1215                       ip6_full_reass_add_trace (
1216                         vm, node, NULL, bi0, frag_hdr, HANDOFF,
1217                         vnet_buffer (b0)->ip.reass.owner_thread_index);
1218                     }
1219                 }
1220               else if (is_feature && IP6_ERROR_NONE == error0)
1221                 {
1222                   vnet_feature_next (&next0, b0);
1223                 }
1224               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1225                                                n_left_to_next, bi0, next0);
1226             }
1227
1228           if (~0 != icmp_bi)
1229             {
1230               next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1231               to_next[0] = icmp_bi;
1232               to_next += 1;
1233               n_left_to_next -= 1;
1234               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1235                                                n_left_to_next, icmp_bi,
1236                                                next0);
1237             }
1238         next_packet:
1239           from += 1;
1240           n_left_from -= 1;
1241         }
1242
1243       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1244     }
1245
1246   clib_spinlock_unlock (&rt->lock);
1247   return frame->n_vectors;
1248 }
1249
1250 static char *ip6_full_reassembly_error_strings[] = {
1251 #define _(sym, string) string,
1252   foreach_ip6_error
1253 #undef _
1254 };
1255
1256 VLIB_NODE_FN (ip6_full_reass_node) (vlib_main_t * vm,
1257                                     vlib_node_runtime_t * node,
1258                                     vlib_frame_t * frame)
1259 {
1260   return ip6_full_reassembly_inline (vm, node, frame, false /* is_feature */ ,
1261                                      false /* is_custom_app */ );
1262 }
1263
1264 VLIB_REGISTER_NODE (ip6_full_reass_node) = {
1265     .name = "ip6-full-reassembly",
1266     .vector_size = sizeof (u32),
1267     .format_trace = format_ip6_full_reass_trace,
1268     .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1269     .error_strings = ip6_full_reassembly_error_strings,
1270     .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1271     .next_nodes =
1272         {
1273                 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1274                 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1275                 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1276                 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reassembly-handoff",
1277         },
1278 };
1279
1280 VLIB_NODE_FN (ip6_full_reass_node_feature) (vlib_main_t * vm,
1281                                             vlib_node_runtime_t * node,
1282                                             vlib_frame_t * frame)
1283 {
1284   return ip6_full_reassembly_inline (vm, node, frame, true /* is_feature */ ,
1285                                      false /* is_custom_app */ );
1286 }
1287
1288 VLIB_REGISTER_NODE (ip6_full_reass_node_feature) = {
1289     .name = "ip6-full-reassembly-feature",
1290     .vector_size = sizeof (u32),
1291     .format_trace = format_ip6_full_reass_trace,
1292     .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1293     .error_strings = ip6_full_reassembly_error_strings,
1294     .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1295     .next_nodes =
1296         {
1297                 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1298                 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1299                 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1300                 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reass-feature-hoff",
1301         },
1302 };
1303
1304 VNET_FEATURE_INIT (ip6_full_reassembly_feature, static) = {
1305     .arc_name = "ip6-unicast",
1306     .node_name = "ip6-full-reassembly-feature",
1307     .runs_before = VNET_FEATURES ("ip6-lookup",
1308                                   "ipsec6-input-feature"),
1309     .runs_after = 0,
1310 };
1311
1312 #ifndef CLIB_MARCH_VARIANT
1313 static u32
1314 ip6_full_reass_get_nbuckets ()
1315 {
1316   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1317   u32 nbuckets;
1318   u8 i;
1319
1320   nbuckets = (u32) (rm->max_reass_n / IP6_FULL_REASS_HT_LOAD_FACTOR);
1321
1322   for (i = 0; i < 31; i++)
1323     if ((1 << i) >= nbuckets)
1324       break;
1325   nbuckets = 1 << i;
1326
1327   return nbuckets;
1328 }
1329 #endif /* CLIB_MARCH_VARIANT */
1330
1331 typedef enum
1332 {
1333   IP6_EVENT_CONFIG_CHANGED = 1,
1334 } ip6_full_reass_event_t;
1335
1336 #ifndef CLIB_MARCH_VARIANT
1337 typedef struct
1338 {
1339   int failure;
1340   clib_bihash_48_8_t *new_hash;
1341 } ip6_rehash_cb_ctx;
1342
1343 static int
1344 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
1345 {
1346   ip6_rehash_cb_ctx *ctx = _ctx;
1347   if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
1348     {
1349       ctx->failure = 1;
1350     }
1351   return (BIHASH_WALK_CONTINUE);
1352 }
1353
1354 static void
1355 ip6_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1356                            u32 max_reassembly_length,
1357                            u32 expire_walk_interval_ms)
1358 {
1359   ip6_full_reass_main.timeout_ms = timeout_ms;
1360   ip6_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1361   ip6_full_reass_main.max_reass_n = max_reassemblies;
1362   ip6_full_reass_main.max_reass_len = max_reassembly_length;
1363   ip6_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1364 }
1365
1366 vnet_api_error_t
1367 ip6_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
1368                     u32 max_reassembly_length, u32 expire_walk_interval_ms)
1369 {
1370   u32 old_nbuckets = ip6_full_reass_get_nbuckets ();
1371   ip6_full_reass_set_params (timeout_ms, max_reassemblies,
1372                              max_reassembly_length, expire_walk_interval_ms);
1373   vlib_process_signal_event (ip6_full_reass_main.vlib_main,
1374                              ip6_full_reass_main.ip6_full_reass_expire_node_idx,
1375                              IP6_EVENT_CONFIG_CHANGED, 0);
1376   u32 new_nbuckets = ip6_full_reass_get_nbuckets ();
1377   if (ip6_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1378     {
1379       clib_bihash_48_8_t new_hash;
1380       clib_memset (&new_hash, 0, sizeof (new_hash));
1381       ip6_rehash_cb_ctx ctx;
1382       ctx.failure = 0;
1383       ctx.new_hash = &new_hash;
1384       clib_bihash_init_48_8 (&new_hash, "ip6-full-reass", new_nbuckets,
1385                              new_nbuckets * 1024);
1386       clib_bihash_foreach_key_value_pair_48_8 (&ip6_full_reass_main.hash,
1387                                                ip6_rehash_cb, &ctx);
1388       if (ctx.failure)
1389         {
1390           clib_bihash_free_48_8 (&new_hash);
1391           return -1;
1392         }
1393       else
1394         {
1395           clib_bihash_free_48_8 (&ip6_full_reass_main.hash);
1396           clib_memcpy_fast (&ip6_full_reass_main.hash, &new_hash,
1397                             sizeof (ip6_full_reass_main.hash));
1398           clib_bihash_copied (&ip6_full_reass_main.hash, &new_hash);
1399         }
1400     }
1401   return 0;
1402 }
1403
1404 vnet_api_error_t
1405 ip6_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1406                     u32 * max_reassembly_length,
1407                     u32 * expire_walk_interval_ms)
1408 {
1409   *timeout_ms = ip6_full_reass_main.timeout_ms;
1410   *max_reassemblies = ip6_full_reass_main.max_reass_n;
1411   *max_reassembly_length = ip6_full_reass_main.max_reass_len;
1412   *expire_walk_interval_ms = ip6_full_reass_main.expire_walk_interval_ms;
1413   return 0;
1414 }
1415
1416 static clib_error_t *
1417 ip6_full_reass_init_function (vlib_main_t * vm)
1418 {
1419   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1420   clib_error_t *error = 0;
1421   u32 nbuckets;
1422   vlib_node_t *node;
1423
1424   rm->vlib_main = vm;
1425
1426   vec_validate (rm->per_thread_data, vlib_num_workers ());
1427   ip6_full_reass_per_thread_t *rt;
1428   vec_foreach (rt, rm->per_thread_data)
1429   {
1430     clib_spinlock_init (&rt->lock);
1431     pool_alloc (rt->pool, rm->max_reass_n);
1432   }
1433
1434   node = vlib_get_node_by_name (vm, (u8 *) "ip6-full-reassembly-expire-walk");
1435   ASSERT (node);
1436   rm->ip6_full_reass_expire_node_idx = node->index;
1437
1438   ip6_full_reass_set_params (IP6_FULL_REASS_TIMEOUT_DEFAULT_MS,
1439                              IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT,
1440                              IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1441                              IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1442
1443   nbuckets = ip6_full_reass_get_nbuckets ();
1444   clib_bihash_init_48_8 (&rm->hash, "ip6-full-reass", nbuckets,
1445                          nbuckets * 1024);
1446
1447   node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
1448   ASSERT (node);
1449   rm->ip6_drop_idx = node->index;
1450   node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
1451   ASSERT (node);
1452   rm->ip6_icmp_error_idx = node->index;
1453
1454   if ((error = vlib_call_init_function (vm, ip_main_init)))
1455     return error;
1456   ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
1457                          ip6_full_reass_node.index);
1458
1459   rm->fq_index = vlib_frame_queue_main_init (ip6_full_reass_node.index, 0);
1460   rm->fq_feature_index =
1461     vlib_frame_queue_main_init (ip6_full_reass_node_feature.index, 0);
1462
1463   rm->feature_use_refcount_per_intf = NULL;
1464   return error;
1465 }
1466
1467 VLIB_INIT_FUNCTION (ip6_full_reass_init_function);
1468 #endif /* CLIB_MARCH_VARIANT */
1469
1470 static uword
1471 ip6_full_reass_walk_expired (vlib_main_t *vm, vlib_node_runtime_t *node,
1472                              CLIB_UNUSED (vlib_frame_t *f))
1473 {
1474   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1475   uword event_type, *event_data = 0;
1476
1477   while (true)
1478     {
1479       vlib_process_wait_for_event_or_clock (vm,
1480                                             (f64) rm->expire_walk_interval_ms
1481                                             / (f64) MSEC_PER_SEC);
1482       event_type = vlib_process_get_events (vm, &event_data);
1483
1484       switch (event_type)
1485         {
1486         case ~0:
1487           /* no events => timeout */
1488           /* fallthrough */
1489         case IP6_EVENT_CONFIG_CHANGED:
1490           /* nothing to do here */
1491           break;
1492         default:
1493           clib_warning ("BUG: event type 0x%wx", event_type);
1494           break;
1495         }
1496       f64 now = vlib_time_now (vm);
1497
1498       ip6_full_reass_t *reass;
1499       int *pool_indexes_to_free = NULL;
1500
1501       uword thread_index = 0;
1502       int index;
1503       const uword nthreads = vlib_num_workers () + 1;
1504       u32 *vec_icmp_bi = NULL;
1505       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1506         {
1507           ip6_full_reass_per_thread_t *rt =
1508             &rm->per_thread_data[thread_index];
1509           clib_spinlock_lock (&rt->lock);
1510
1511           vec_reset_length (pool_indexes_to_free);
1512           pool_foreach_index (index, rt->pool)  {
1513                                 reass = pool_elt_at_index (rt->pool, index);
1514                                 if (now > reass->last_heard + rm->timeout)
1515                                   {
1516                                     vec_add1 (pool_indexes_to_free, index);
1517                                   }
1518                               }
1519           int *i;
1520           vec_foreach (i, pool_indexes_to_free)
1521           {
1522             ip6_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1523             u32 icmp_bi = ~0;
1524             ip6_full_reass_on_timeout (vm, node, reass, &icmp_bi);
1525             if (~0 != icmp_bi)
1526               vec_add1 (vec_icmp_bi, icmp_bi);
1527
1528             ip6_full_reass_free (rm, rt, reass);
1529           }
1530
1531           clib_spinlock_unlock (&rt->lock);
1532         }
1533
1534       while (vec_len (vec_icmp_bi) > 0)
1535         {
1536           vlib_frame_t *f =
1537             vlib_get_frame_to_node (vm, rm->ip6_icmp_error_idx);
1538           u32 *to_next = vlib_frame_vector_args (f);
1539           u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
1540           int trace_frame = 0;
1541           while (vec_len (vec_icmp_bi) > 0 && n_left_to_next > 0)
1542             {
1543               u32 bi = vec_pop (vec_icmp_bi);
1544               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1545               if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1546                 trace_frame = 1;
1547               b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
1548               to_next[0] = bi;
1549               ++f->n_vectors;
1550               to_next += 1;
1551               n_left_to_next -= 1;
1552             }
1553           f->frame_flags |= (trace_frame * VLIB_FRAME_TRACE);
1554           vlib_put_frame_to_node (vm, rm->ip6_icmp_error_idx, f);
1555         }
1556
1557       vec_free (pool_indexes_to_free);
1558       vec_free (vec_icmp_bi);
1559       if (event_data)
1560         {
1561           _vec_len (event_data) = 0;
1562         }
1563     }
1564
1565   return 0;
1566 }
1567
1568 VLIB_REGISTER_NODE (ip6_full_reass_expire_node) = {
1569     .function = ip6_full_reass_walk_expired,
1570     .format_trace = format_ip6_full_reass_trace,
1571     .type = VLIB_NODE_TYPE_PROCESS,
1572     .name = "ip6-full-reassembly-expire-walk",
1573
1574     .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1575     .error_strings = ip6_full_reassembly_error_strings,
1576
1577 };
1578
1579 static u8 *
1580 format_ip6_full_reass_key (u8 * s, va_list * args)
1581 {
1582   ip6_full_reass_key_t *key = va_arg (*args, ip6_full_reass_key_t *);
1583   s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1584               key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1585               &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1586   return s;
1587 }
1588
1589 static u8 *
1590 format_ip6_full_reass (u8 * s, va_list * args)
1591 {
1592   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1593   ip6_full_reass_t *reass = va_arg (*args, ip6_full_reass_t *);
1594
1595   s = format (s, "ID: %lu, key: %U\n  first_bi: %u, data_len: %u, "
1596               "last_packet_octet: %u, trace_op_counter: %u\n",
1597               reass->id, format_ip6_full_reass_key, &reass->key,
1598               reass->first_bi, reass->data_len, reass->last_packet_octet,
1599               reass->trace_op_counter);
1600   u32 bi = reass->first_bi;
1601   u32 counter = 0;
1602   while (~0 != bi)
1603     {
1604       vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1605       vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1606       s = format (s, "  #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1607                   "fragment[%u, %u]\n",
1608                   counter, vnb->ip.reass.range_first,
1609                   vnb->ip.reass.range_last, bi,
1610                   ip6_full_reass_buffer_get_data_offset (b),
1611                   ip6_full_reass_buffer_get_data_len (b),
1612                   vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1613       if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1614         {
1615           bi = b->next_buffer;
1616         }
1617       else
1618         {
1619           bi = ~0;
1620         }
1621     }
1622   return s;
1623 }
1624
1625 static clib_error_t *
1626 show_ip6_full_reass (vlib_main_t * vm, unformat_input_t * input,
1627                      CLIB_UNUSED (vlib_cli_command_t * lmd))
1628 {
1629   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1630
1631   vlib_cli_output (vm, "---------------------");
1632   vlib_cli_output (vm, "IP6 reassembly status");
1633   vlib_cli_output (vm, "---------------------");
1634   bool details = false;
1635   if (unformat (input, "details"))
1636     {
1637       details = true;
1638     }
1639
1640   u32 sum_reass_n = 0;
1641   u64 sum_buffers_n = 0;
1642   ip6_full_reass_t *reass;
1643   uword thread_index;
1644   const uword nthreads = vlib_num_workers () + 1;
1645   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1646     {
1647       ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1648       clib_spinlock_lock (&rt->lock);
1649       if (details)
1650         {
1651           pool_foreach (reass, rt->pool) {
1652             vlib_cli_output (vm, "%U", format_ip6_full_reass, vm, reass);
1653           }
1654         }
1655       sum_reass_n += rt->reass_n;
1656       clib_spinlock_unlock (&rt->lock);
1657     }
1658   vlib_cli_output (vm, "---------------------");
1659   vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1660                    (long unsigned) sum_reass_n);
1661   vlib_cli_output (vm,
1662                    "Maximum configured concurrent full IP6 reassemblies per worker-thread: %lu\n",
1663                    (long unsigned) rm->max_reass_n);
1664   vlib_cli_output (vm,
1665                    "Maximum configured amount of fragments "
1666                    "per full IP6 reassembly: %lu\n",
1667                    (long unsigned) rm->max_reass_len);
1668   vlib_cli_output (vm,
1669                    "Maximum configured full IP6 reassembly timeout: %lums\n",
1670                    (long unsigned) rm->timeout_ms);
1671   vlib_cli_output (vm,
1672                    "Maximum configured full IP6 reassembly expire walk interval: %lums\n",
1673                    (long unsigned) rm->expire_walk_interval_ms);
1674   vlib_cli_output (vm, "Buffers in use: %lu\n",
1675                    (long unsigned) sum_buffers_n);
1676   return 0;
1677 }
1678
1679 VLIB_CLI_COMMAND (show_ip6_full_reassembly_cmd, static) = {
1680     .path = "show ip6-full-reassembly",
1681     .short_help = "show ip6-full-reassembly [details]",
1682     .function = show_ip6_full_reass,
1683 };
1684
1685 #ifndef CLIB_MARCH_VARIANT
1686 vnet_api_error_t
1687 ip6_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1688 {
1689   return vnet_feature_enable_disable ("ip6-unicast",
1690                                       "ip6-full-reassembly-feature",
1691                                       sw_if_index, enable_disable, 0, 0);
1692 }
1693 #endif /* CLIB_MARCH_VARIANT */
1694
1695 #define foreach_ip6_full_reassembly_handoff_error                       \
1696 _(CONGESTION_DROP, "congestion drop")
1697
1698
1699 typedef enum
1700 {
1701 #define _(sym,str) IP6_FULL_REASSEMBLY_HANDOFF_ERROR_##sym,
1702   foreach_ip6_full_reassembly_handoff_error
1703 #undef _
1704     IP6_FULL_REASSEMBLY_HANDOFF_N_ERROR,
1705 } ip6_full_reassembly_handoff_error_t;
1706
1707 static char *ip6_full_reassembly_handoff_error_strings[] = {
1708 #define _(sym,string) string,
1709   foreach_ip6_full_reassembly_handoff_error
1710 #undef _
1711 };
1712
1713 typedef struct
1714 {
1715   u32 next_worker_index;
1716 } ip6_full_reassembly_handoff_trace_t;
1717
1718 static u8 *
1719 format_ip6_full_reassembly_handoff_trace (u8 * s, va_list * args)
1720 {
1721   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1722   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1723   ip6_full_reassembly_handoff_trace_t *t =
1724     va_arg (*args, ip6_full_reassembly_handoff_trace_t *);
1725
1726   s =
1727     format (s, "ip6-full-reassembly-handoff: next-worker %d",
1728             t->next_worker_index);
1729
1730   return s;
1731 }
1732
1733 always_inline uword
1734 ip6_full_reassembly_handoff_inline (vlib_main_t * vm,
1735                                     vlib_node_runtime_t * node,
1736                                     vlib_frame_t * frame, bool is_feature)
1737 {
1738   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1739
1740   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1741   u32 n_enq, n_left_from, *from;
1742   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1743   u32 fq_index;
1744
1745   from = vlib_frame_vector_args (frame);
1746   n_left_from = frame->n_vectors;
1747   vlib_get_buffers (vm, from, bufs, n_left_from);
1748
1749   b = bufs;
1750   ti = thread_indices;
1751
1752   fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1753
1754   while (n_left_from > 0)
1755     {
1756       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1757
1758       if (PREDICT_FALSE
1759           ((node->flags & VLIB_NODE_FLAG_TRACE)
1760            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1761         {
1762           ip6_full_reassembly_handoff_trace_t *t =
1763             vlib_add_trace (vm, node, b[0], sizeof (*t));
1764           t->next_worker_index = ti[0];
1765         }
1766
1767       n_left_from -= 1;
1768       ti += 1;
1769       b += 1;
1770     }
1771   n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from,
1772                                          thread_indices, frame->n_vectors, 1);
1773
1774   if (n_enq < frame->n_vectors)
1775     vlib_node_increment_counter (vm, node->node_index,
1776                                  IP6_FULL_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1777                                  frame->n_vectors - n_enq);
1778   return frame->n_vectors;
1779 }
1780
1781 VLIB_NODE_FN (ip6_full_reassembly_handoff_node) (vlib_main_t * vm,
1782                                                  vlib_node_runtime_t * node,
1783                                                  vlib_frame_t * frame)
1784 {
1785   return ip6_full_reassembly_handoff_inline (vm, node, frame,
1786                                              false /* is_feature */ );
1787 }
1788
1789 VLIB_REGISTER_NODE (ip6_full_reassembly_handoff_node) = {
1790   .name = "ip6-full-reassembly-handoff",
1791   .vector_size = sizeof (u32),
1792   .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
1793   .error_strings = ip6_full_reassembly_handoff_error_strings,
1794   .format_trace = format_ip6_full_reassembly_handoff_trace,
1795
1796   .n_next_nodes = 1,
1797
1798   .next_nodes = {
1799     [0] = "error-drop",
1800   },
1801 };
1802
1803
1804 VLIB_NODE_FN (ip6_full_reassembly_feature_handoff_node) (vlib_main_t * vm,
1805                                vlib_node_runtime_t * node, vlib_frame_t * frame)
1806 {
1807   return ip6_full_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1808 }
1809
1810
1811 VLIB_REGISTER_NODE (ip6_full_reassembly_feature_handoff_node) = {
1812   .name = "ip6-full-reass-feature-hoff",
1813   .vector_size = sizeof (u32),
1814   .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
1815   .error_strings = ip6_full_reassembly_handoff_error_strings,
1816   .format_trace = format_ip6_full_reassembly_handoff_trace,
1817
1818   .n_next_nodes = 1,
1819
1820   .next_nodes = {
1821     [0] = "error-drop",
1822   },
1823 };
1824
1825 #ifndef CLIB_MARCH_VARIANT
1826 int
1827 ip6_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1828 {
1829   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1830   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1831   if (is_enable)
1832     {
1833       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1834         {
1835           ++rm->feature_use_refcount_per_intf[sw_if_index];
1836           return vnet_feature_enable_disable ("ip6-unicast",
1837                                               "ip6-full-reassembly-feature",
1838                                               sw_if_index, 1, 0, 0);
1839         }
1840       ++rm->feature_use_refcount_per_intf[sw_if_index];
1841     }
1842   else
1843     {
1844       --rm->feature_use_refcount_per_intf[sw_if_index];
1845       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1846         return vnet_feature_enable_disable ("ip6-unicast",
1847                                             "ip6-full-reassembly-feature",
1848                                             sw_if_index, 0, 0, 0);
1849     }
1850   return -1;
1851 }
1852 #endif
1853
1854 /*
1855  * fd.io coding-style-patch-verification: ON
1856  *
1857  * Local Variables:
1858  * eval: (c-set-style "gnu")
1859  * End:
1860  */