src/vnet/ip/ip4_reassembly.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 IPv4 Reassembly.
  19  *
  20  * This file contains the source code for IPv4 reassembly.
  21  */
  22
  23 #include <vppinfra/vec.h>
  24 #include <vnet/vnet.h>
  25 #include <vnet/ip/ip.h>
  26 #include <vppinfra/bihash_24_8.h>
  27 #include <vnet/ip/ip4_reassembly.h>
  28
  29 #define MSEC_PER_SEC 1000
  30 #define IP4_REASS_TIMEOUT_DEFAULT_MS 100
  31 #define IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default
  32 #define IP4_REASS_MAX_REASSEMBLIES_DEAFULT 1024
  33 #define IP4_REASS_HT_LOAD_FACTOR (0.75)
  34
  35 #define IP4_REASS_DEBUG_BUFFERS 0
  36 #if IP4_REASS_DEBUG_BUFFERS
  37 #define IP4_REASS_DEBUG_BUFFER(bi, what)             \
  38   do                                                 \
  39     {                                                \
  40       u32 _bi = bi;                                  \
  41       printf (#what "buffer %u", _bi);               \
  42       vlib_buffer_t *_b = vlib_get_buffer (vm, _bi); \
  43       while (_b->flags & VLIB_BUFFER_NEXT_PRESENT)   \
  44         {                                            \
  45           _bi = _b->next_buffer;                     \
  46           printf ("[%u]", _bi);                      \
  47           _b = vlib_get_buffer (vm, _bi);            \
  48         }                                            \
  49       printf ("\n");                                 \
  50       fflush (stdout);                               \
  51     }                                                \
  52   while (0)
  53 #else
  54 #define IP4_REASS_DEBUG_BUFFER(...)
  55 #endif
  56
  57 static vlib_node_registration_t ip4_reass_node;
  58
  59 typedef struct
  60 {
  61   union
  62   {
  63     struct
  64     {
  65       // align by making this 4 octets even though its a 2 octets field
  66       u32 xx_id;
  67       ip4_address_t src;
  68       ip4_address_t dst;
  69       // align by making this 4 octets even though its a 2 octets field
  70       u32 frag_id;
  71       // align by making this 4 octets even though its a 1 octet field
  72       u32 proto;
  73       u32 unused;
  74     };
  75     u64 as_u64[3];
  76   };
  77 } ip4_reass_key_t;
  78
  79 always_inline u32
  80 ip4_reass_buffer_get_data_offset_no_check (vlib_buffer_t * b)
  81 {
  82   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
  83   return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first;
  84 }
  85
  86 always_inline u32
  87 ip4_reass_buffer_get_data_offset (vlib_buffer_t * b)
  88 {
  89   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
  90   ASSERT (vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first);
  91   return ip4_reass_buffer_get_data_offset_no_check (b);
  92 }
  93
  94 always_inline u16
  95 ip4_reass_buffer_get_data_len_no_check (vlib_buffer_t * b)
  96 {
  97   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
  98   return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) -
  99     (vnb->ip.reass.fragment_first + ip4_reass_buffer_get_data_offset (b)) + 1;
 100 }
 101
 102 always_inline u16
 103 ip4_reass_buffer_get_data_len (vlib_buffer_t * b)
 104 {
 105   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 106   ASSERT (vnb->ip.reass.range_last > vnb->ip.reass.fragment_first);
 107   return ip4_reass_buffer_get_data_len_no_check (b);
 108 }
 109
 110 typedef struct
 111 {
 112   // hash table key
 113   ip4_reass_key_t key;
 114   f64 first_heard;
 115   // time when last packet was received
 116   f64 last_heard;
 117   // internal id of this reassembly
 118   u32 id;
 119   // buffer index of first buffer in this reassembly context
 120   u32 first_bi;
 121   // last octet of packet, ~0 until fragment without more_fragments arrives
 122   u32 last_packet_octet;
 123   // length of data collected so far
 124   u32 data_len;
 125   // trace operation counter
 126   u32 trace_op_counter;
 127 } ip4_reass_t;
 128
 129 typedef struct
 130 {
 131   // IPv4 config
 132   u32 timeout_ms;
 133   f64 timeout;
 134   u32 expire_walk_interval_ms;
 135   u32 max_reass_n;
 136
 137   // IPv4 runtime
 138   ip4_reass_t *pool;
 139   clib_bihash_24_8_t hash;
 140   u32 reass_n;
 141   u32 id_counter;
 142   u32 buffers_n;
 143
 144   // convenience
 145   vlib_main_t *vlib_main;
 146   vnet_main_t *vnet_main;
 147
 148   // node index of ip4-drop node
 149   u32 ip4_drop_idx;
 150   u32 ip4_reass_expire_node_idx;
 151
 152 } ip4_reass_main_t;
 153
 154 ip4_reass_main_t ip4_reass_main;
 155
 156 typedef enum
 157 {
 158   IP4_REASSEMBLY_NEXT_INPUT,
 159   IP4_REASSEMBLY_NEXT_DROP,
 160   IP4_REASSEMBLY_N_NEXT,
 161 } ip4_reass_next_t;
 162
 163 typedef enum
 164 {
 165   RANGE_NEW,
 166   RANGE_SHRINK,
 167   RANGE_DISCARD,
 168   RANGE_OVERLAP,
 169   FINALIZE,
 170 } ip4_reass_trace_operation_e;
 171
 172 typedef struct
 173 {
 174   u16 range_first;
 175   u16 range_last;
 176   u32 range_bi;
 177   i32 data_offset;
 178   u32 data_len;
 179   u32 first_bi;
 180 } ip4_reass_range_trace_t;
 181
 182 typedef struct
 183 {
 184   ip4_reass_trace_operation_e action;
 185   u32 pool_index;
 186   u32 reass_id;
 187   ip4_reass_range_trace_t trace_range;
 188   u32 size_diff;
 189   u32 op_id;
 190   u32 fragment_first;
 191   u32 fragment_last;
 192   u32 total_data_len;
 193 } ip4_reass_trace_t;
 194
 195 void
 196 ip4_reass_trace_details (vlib_main_t * vm, u32 bi,
 197                          ip4_reass_range_trace_t * trace)
 198 {
 199   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 200   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 201   trace->range_first = vnb->ip.reass.range_first;
 202   trace->range_last = vnb->ip.reass.range_last;
 203   trace->data_offset = ip4_reass_buffer_get_data_offset_no_check (b);
 204   trace->data_len = ip4_reass_buffer_get_data_len_no_check (b);
 205   trace->range_bi = bi;
 206 }
 207
 208 u8 *
 209 format_ip4_reass_range_trace (u8 * s, va_list * args)
 210 {
 211   ip4_reass_range_trace_t *trace = va_arg (*args, ip4_reass_range_trace_t *);
 212   s = format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
 213               trace->range_last, trace->data_offset, trace->data_len,
 214               trace->range_bi);
 215   return s;
 216 }
 217
 218 u8 *
 219 format_ip4_reass_trace (u8 * s, va_list * args)
 220 {
 221   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 222   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 223   ip4_reass_trace_t *t = va_arg (*args, ip4_reass_trace_t *);
 224   s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
 225   u32 indent = format_get_indent (s);
 226   s = format (s, "first bi: %u, data len: %u, ip/fragment[%u, %u]",
 227               t->trace_range.first_bi, t->total_data_len, t->fragment_first,
 228               t->fragment_last);
 229   switch (t->action)
 230     {
 231     case RANGE_SHRINK:
 232       s = format (s, "\n%Ushrink %U by %u", format_white_space, indent,
 233                   format_ip4_reass_range_trace, &t->trace_range,
 234                   t->size_diff);
 235       break;
 236     case RANGE_DISCARD:
 237       s = format (s, "\n%Udiscard %U", format_white_space, indent,
 238                   format_ip4_reass_range_trace, &t->trace_range);
 239       break;
 240     case RANGE_NEW:
 241       s = format (s, "\n%Unew %U", format_white_space, indent,
 242                   format_ip4_reass_range_trace, &t->trace_range);
 243       break;
 244     case RANGE_OVERLAP:
 245       s = format (s, "\n%Uoverlapping/ignored %U", format_white_space, indent,
 246                   format_ip4_reass_range_trace, &t->trace_range);
 247       break;
 248     case FINALIZE:
 249       s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
 250       break;
 251     }
 252   return s;
 253 }
 254
 255 void
 256 ip4_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 257                      ip4_reass_main_t * rm, ip4_reass_t * reass, u32 bi,
 258                      ip4_reass_trace_operation_e action, u32 size_diff)
 259 {
 260   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 261   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 262   ip4_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 263   t->pool_index = reass - rm->pool;
 264   t->reass_id = reass->id;
 265   t->action = action;
 266   ip4_reass_trace_details (vm, bi, &t->trace_range);
 267   t->size_diff = size_diff;
 268   t->op_id = reass->trace_op_counter;
 269   ++reass->trace_op_counter;
 270   t->fragment_first = vnb->ip.reass.fragment_first;
 271   t->fragment_last = vnb->ip.reass.fragment_last;
 272   t->trace_range.first_bi = reass->first_bi;
 273   t->total_data_len = reass->data_len;
 274 #if 0
 275   static u8 *s = NULL;
 276   s = format (s, "%U", format_ip4_reass_trace, NULL, NULL, t);
 277   printf ("%.*s\n", vec_len (s), s);
 278   fflush (stdout);
 279   vec_reset_length (s);
 280 #endif
 281 }
 282
 283 void
 284 ip4_reass_free (ip4_reass_main_t * rm, ip4_reass_t * reass)
 285 {
 286   clib_bihash_kv_24_8_t kv;
 287   kv.key[0] = reass->key.as_u64[0];
 288   kv.key[1] = reass->key.as_u64[1];
 289   kv.key[2] = reass->key.as_u64[2];
 290   clib_bihash_add_del_24_8 (&rm->hash, &kv, 0);
 291   pool_put (rm->pool, reass);
 292   --rm->reass_n;
 293 }
 294
 295 static void
 296 ip4_reass_on_timeout (vlib_main_t * vm, ip4_reass_main_t * rm,
 297                       ip4_reass_t * reass, u32 ** vec_drop_timeout)
 298 {
 299   u32 range_bi = reass->first_bi;
 300   vlib_buffer_t *range_b;
 301   vnet_buffer_opaque_t *range_vnb;
 302   while (~0 != range_bi)
 303     {
 304       range_b = vlib_get_buffer (vm, range_bi);
 305       range_vnb = vnet_buffer (range_b);
 306       u32 bi = range_bi;
 307       while (~0 != bi)
 308         {
 309           vec_add1 (*vec_drop_timeout, bi);
 310           vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 311           if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 312             {
 313               bi = b->next_buffer;
 314               b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 315             }
 316           else
 317             {
 318               bi = ~0;
 319             }
 320         }
 321       range_bi = range_vnb->ip.reass.next_range_bi;
 322     }
 323 }
 324
 325 ip4_reass_t *
 326 ip4_reass_find_or_create (vlib_main_t * vm, ip4_reass_main_t * rm,
 327                           ip4_reass_key_t * k, u32 ** vec_drop_timeout)
 328 {
 329   ip4_reass_t *reass = NULL;
 330   f64 now = vlib_time_now (rm->vlib_main);
 331   clib_bihash_kv_24_8_t kv, value;
 332   kv.key[0] = k->as_u64[0];
 333   kv.key[1] = k->as_u64[1];
 334   kv.key[2] = k->as_u64[2];
 335
 336   if (!clib_bihash_search_24_8 (&rm->hash, &kv, &value))
 337     {
 338       reass = pool_elt_at_index (rm->pool, value.value);
 339       if (now > reass->last_heard + rm->timeout)
 340         {
 341           ip4_reass_on_timeout (vm, rm, reass, vec_drop_timeout);
 342           ip4_reass_free (rm, reass);
 343           reass = NULL;
 344         }
 345     }
 346
 347   if (reass)
 348     {
 349       reass->last_heard = now;
 350       return reass;
 351     }
 352
 353   if (rm->reass_n >= rm->max_reass_n)
 354     {
 355       reass = NULL;
 356       return reass;
 357     }
 358   else
 359     {
 360       pool_get (rm->pool, reass);
 361       memset (reass, 0, sizeof (*reass));
 362       reass->id = rm->id_counter;
 363       ++rm->id_counter;
 364       reass->first_bi = ~0;
 365       reass->last_packet_octet = ~0;
 366       reass->data_len = 0;
 367       ++rm->reass_n;
 368     }
 369
 370   reass->key.as_u64[0] = kv.key[0] = k->as_u64[0];
 371   reass->key.as_u64[1] = kv.key[1] = k->as_u64[1];
 372   reass->key.as_u64[2] = kv.key[2] = k->as_u64[2];
 373   kv.value = reass - rm->pool;
 374   reass->last_heard = now;
 375
 376   if (clib_bihash_add_del_24_8 (&rm->hash, &kv, 1))
 377     {
 378       ip4_reass_free (rm, reass);
 379       reass = NULL;
 380     }
 381
 382   return reass;
 383 }
 384
 385 void
 386 ip4_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
 387                     ip4_reass_main_t * rm, ip4_reass_t * reass, u32 * bi0,
 388                     u32 * next0, vlib_error_t * error0, u32 next_input,
 389                     u32 ** vec_drop_compress, u32 ** vec_drop_overlap)
 390 {
 391   ASSERT (~0 != reass->first_bi);
 392   vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
 393   vlib_buffer_t *last_b = NULL;
 394   u32 sub_chain_bi = reass->first_bi;
 395   u32 total_length = 0;
 396   u32 buf_cnt = 0;
 397   u32 dropped_cnt = 0;
 398   do
 399     {
 400       u32 tmp_bi = sub_chain_bi;
 401       vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
 402       ip4_header_t *ip = vlib_buffer_get_current (tmp);
 403       u32 data_len = ip4_reass_buffer_get_data_len (tmp);
 404       u32 trim_front =
 405         ip4_header_bytes (ip) + ip4_reass_buffer_get_data_offset (tmp);
 406       u32 trim_end =
 407         vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
 408       if (tmp_bi == reass->first_bi)
 409         {
 410           /* first buffer - keep ip4 header */
 411           ASSERT (0 == ip4_reass_buffer_get_data_offset (tmp));
 412           trim_front = 0;
 413           trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
 414             ip4_header_bytes (ip);
 415         }
 416       u32 keep_data =
 417         vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
 418       while (1)
 419         {
 420           ++buf_cnt;
 421           if (trim_front)
 422             {
 423               if (trim_front > tmp->current_length)
 424                 {
 425                   /* drop whole buffer */
 426                   vec_add1 (*vec_drop_compress, tmp_bi);
 427                   ++dropped_cnt;
 428                   trim_front -= tmp->current_length;
 429                   ASSERT (tmp->flags & VLIB_BUFFER_NEXT_PRESENT);
 430                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 431                   tmp_bi = tmp->next_buffer;
 432                   tmp = vlib_get_buffer (vm, tmp_bi);
 433                   continue;
 434                 }
 435               else
 436                 {
 437                   vlib_buffer_advance (tmp, trim_front);
 438                   trim_front = 0;
 439                 }
 440             }
 441           if (keep_data)
 442             {
 443               if (last_b)
 444                 {
 445                   last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
 446                   last_b->next_buffer = tmp_bi;
 447                 }
 448               last_b = tmp;
 449               if (keep_data <= tmp->current_length)
 450                 {
 451                   tmp->current_length = keep_data;
 452                   keep_data = 0;
 453                 }
 454               else
 455                 {
 456                   keep_data -= tmp->current_length;
 457                   ASSERT (tmp->flags & VLIB_BUFFER_NEXT_PRESENT);
 458                 }
 459               total_length += tmp->current_length;
 460             }
 461           else
 462             {
 463               vec_add1 (*vec_drop_overlap, tmp_bi);
 464               ASSERT (reass->first_bi != tmp_bi);
 465               ++dropped_cnt;
 466             }
 467           if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 468             {
 469               tmp_bi = tmp->next_buffer;
 470               tmp = vlib_get_buffer (vm, tmp->next_buffer);
 471             }
 472           else
 473             {
 474               break;
 475             }
 476         }
 477       sub_chain_bi =
 478         vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
 479         reass.next_range_bi;
 480     }
 481   while (~0 != sub_chain_bi);
 482   last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 483   ASSERT (rm->buffers_n >= (buf_cnt - dropped_cnt));
 484   rm->buffers_n -= buf_cnt - dropped_cnt;
 485   ASSERT (total_length >= first_b->current_length);
 486   total_length -= first_b->current_length;
 487   first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
 488   first_b->total_length_not_including_first_buffer = total_length;
 489   ip4_header_t *ip = vlib_buffer_get_current (first_b);
 490   ip->flags_and_fragment_offset = 0;
 491   ip->length = clib_host_to_net_u16 (first_b->current_length + total_length);
 492   ip->checksum = ip4_header_checksum (ip);
 493   vlib_buffer_chain_compress (vm, first_b, vec_drop_compress);
 494   if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
 495     {
 496       ip4_reass_add_trace (vm, node, rm, reass, reass->first_bi, FINALIZE, 0);
 497 #if 0
 498       // following code does a hexdump of packet fragments to stdout ...
 499       do
 500         {
 501           u32 bi = reass->first_bi;
 502           u8 *s = NULL;
 503           while (~0 != bi)
 504             {
 505               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 506               s = format (s, "%u: %U\n", bi, format_hexdump,
 507                           vlib_buffer_get_current (b), b->current_length);
 508               if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 509                 {
 510                   bi = b->next_buffer;
 511                 }
 512               else
 513                 {
 514                   break;
 515                 }
 516             }
 517           printf ("%.*s\n", vec_len (s), s);
 518           fflush (stdout);
 519           vec_free (s);
 520         }
 521       while (0);
 522 #endif
 523     }
 524   *bi0 = reass->first_bi;
 525   *next0 = next_input;
 526   *error0 = IP4_ERROR_NONE;
 527   ip4_reass_free (rm, reass);
 528   reass = NULL;
 529 }
 530
 531 static u32
 532 ip4_reass_get_buffer_chain_length (vlib_main_t * vm, vlib_buffer_t * b)
 533 {
 534   u32 len = 0;
 535   while (b)
 536     {
 537       ++len;
 538       if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
 539         {
 540           b = vlib_get_buffer (vm, b->next_buffer);
 541         }
 542       else
 543         {
 544           break;
 545         }
 546     }
 547   return len;
 548 }
 549
 550 static void
 551 ip4_reass_insert_range_in_chain (vlib_main_t * vm,
 552                                  ip4_reass_main_t * rm,
 553                                  ip4_reass_t * reass,
 554                                  u32 prev_range_bi, u32 new_next_bi)
 555 {
 556
 557   vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
 558   vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
 559   if (~0 != prev_range_bi)
 560     {
 561       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 562       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 563       new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
 564       prev_vnb->ip.reass.next_range_bi = new_next_bi;
 565     }
 566   else
 567     {
 568       if (~0 != reass->first_bi)
 569         {
 570           new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
 571         }
 572       reass->first_bi = new_next_bi;
 573     }
 574   reass->data_len += ip4_reass_buffer_get_data_len (new_next_b);
 575   rm->buffers_n += ip4_reass_get_buffer_chain_length (vm, new_next_b);
 576 }
 577
 578 static void
 579 ip4_reass_remove_range_from_chain (vlib_main_t * vm,
 580                                    vlib_node_runtime_t * node,
 581                                    ip4_reass_main_t * rm,
 582                                    u32 ** vec_drop_overlap,
 583                                    ip4_reass_t * reass, u32 prev_range_bi,
 584                                    u32 discard_bi)
 585 {
 586   vlib_buffer_t *discard_b = vlib_get_buffer (vm, discard_bi);
 587   vnet_buffer_opaque_t *discard_vnb = vnet_buffer (discard_b);
 588   if (~0 != prev_range_bi)
 589     {
 590       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 591       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 592       ASSERT (prev_vnb->ip.reass.next_range_bi == discard_bi);
 593       prev_vnb->ip.reass.next_range_bi = discard_vnb->ip.reass.next_range_bi;
 594     }
 595   else
 596     {
 597       reass->first_bi = discard_vnb->ip.reass.next_range_bi;
 598     }
 599   reass->data_len -= ip4_reass_buffer_get_data_len (discard_b);
 600   while (1)
 601     {
 602       vec_add1 (*vec_drop_overlap, discard_bi);
 603       if (PREDICT_FALSE (discard_b->flags & VLIB_BUFFER_IS_TRACED))
 604         {
 605           ip4_reass_add_trace (vm, node, rm, reass, discard_bi, RANGE_DISCARD,
 606                                0);
 607         }
 608       if (discard_b->flags & VLIB_BUFFER_NEXT_PRESENT)
 609         {
 610           discard_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 611           discard_bi = discard_b->next_buffer;
 612           discard_b = vlib_get_buffer (vm, discard_bi);
 613         }
 614       else
 615         {
 616           break;
 617         }
 618     }
 619 }
 620
 621 void
 622 ip4_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 623                   ip4_reass_main_t * rm, ip4_reass_t * reass, u32 * bi0,
 624                   u32 * next0, vlib_error_t * error0,
 625                   u32 ** vec_drop_overlap, u32 ** vec_drop_compress,
 626                   u32 next_input, u32 next_drop)
 627 {
 628   int consumed = 0;
 629   vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
 630   ip4_header_t *fip = vlib_buffer_get_current (fb);
 631   ASSERT (fb->current_length >= sizeof (*fip));
 632   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 633   u32 fragment_first = fvnb->ip.reass.fragment_first =
 634     ip4_get_fragment_offset_bytes (fip);
 635   u32 fragment_length =
 636     clib_net_to_host_u16 (fip->length) - ip4_header_bytes (fip);
 637   u32 fragment_last = fvnb->ip.reass.fragment_last =
 638     fragment_first + fragment_length - 1;
 639   int more_fragments = ip4_get_fragment_more (fip);
 640   u32 candidate_range_bi = reass->first_bi;
 641   u32 prev_range_bi = ~0;
 642   fvnb->ip.reass.range_first = fragment_first;
 643   fvnb->ip.reass.range_last = fragment_last;
 644   fvnb->ip.reass.next_range_bi = ~0;
 645   if (!more_fragments)
 646     {
 647       reass->last_packet_octet = fragment_last;
 648     }
 649   if (~0 == reass->first_bi)
 650     {
 651       // starting a new reassembly
 652       ip4_reass_insert_range_in_chain (vm, rm, reass, prev_range_bi, *bi0);
 653       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 654         {
 655           ip4_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0);
 656         }
 657       *bi0 = ~0;
 658       fvnb->ip.reass.estimated_mtu = clib_net_to_host_u16 (fip->length);
 659       return;
 660     }
 661   fvnb->ip.reass.estimated_mtu = clib_min (clib_net_to_host_u16 (fip->length),
 662                                            fvnb->ip.reass.estimated_mtu);
 663   while (~0 != candidate_range_bi)
 664     {
 665       vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
 666       vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
 667       if (fragment_first > candidate_vnb->ip.reass.range_last)
 668         {
 669           // this fragments starts after candidate range
 670           prev_range_bi = candidate_range_bi;
 671           candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
 672           if (candidate_vnb->ip.reass.range_last < fragment_last &&
 673               ~0 == candidate_range_bi)
 674             {
 675               // special case - this fragment falls beyond all known ranges
 676               ip4_reass_insert_range_in_chain (vm, rm, reass, prev_range_bi,
 677                                                *bi0);
 678               consumed = 1;
 679               break;
 680             }
 681           continue;
 682         }
 683       if (fragment_last < candidate_vnb->ip.reass.range_first)
 684         {
 685           // this fragment ends before candidate range without any overlap
 686           ip4_reass_insert_range_in_chain (vm, rm, reass, prev_range_bi,
 687                                            *bi0);
 688           consumed = 1;
 689         }
 690       else
 691         {
 692           if (fragment_first >= candidate_vnb->ip.reass.range_first &&
 693               fragment_last <= candidate_vnb->ip.reass.range_last)
 694             {
 695               // this fragment is a (sub)part of existing range, ignore it
 696               if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 697                 {
 698                   ip4_reass_add_trace (vm, node, rm, reass, *bi0,
 699                                        RANGE_OVERLAP, 0);
 700                 }
 701               break;
 702             }
 703           int discard_candidate = 0;
 704           if (fragment_first < candidate_vnb->ip.reass.range_first)
 705             {
 706               u32 overlap =
 707                 fragment_last - candidate_vnb->ip.reass.range_first + 1;
 708               if (overlap < ip4_reass_buffer_get_data_len (candidate_b))
 709                 {
 710                   candidate_vnb->ip.reass.range_first += overlap;
 711                   ASSERT (reass->data_len >= overlap);
 712                   reass->data_len -= overlap;
 713                   if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 714                     {
 715                       ip4_reass_add_trace (vm, node, rm, reass,
 716                                            candidate_range_bi, RANGE_SHRINK,
 717                                            overlap);
 718                     }
 719                   ip4_reass_insert_range_in_chain (vm, rm, reass,
 720                                                    prev_range_bi, *bi0);
 721                   consumed = 1;
 722                 }
 723               else
 724                 {
 725                   discard_candidate = 1;
 726                 }
 727             }
 728           else if (fragment_last > candidate_vnb->ip.reass.range_last)
 729             {
 730               u32 overlap =
 731                 candidate_vnb->ip.reass.range_last - fragment_first + 1;
 732               if (overlap < ip4_reass_buffer_get_data_len (candidate_b))
 733                 {
 734                   fvnb->ip.reass.range_first += overlap;
 735                   if (~0 != candidate_vnb->ip.reass.next_range_bi)
 736                     {
 737                       prev_range_bi = candidate_range_bi;
 738                       candidate_range_bi =
 739                         candidate_vnb->ip.reass.next_range_bi;
 740                       continue;
 741                     }
 742                   else
 743                     {
 744                       // special case - last range discarded
 745                       ip4_reass_insert_range_in_chain (vm, rm, reass,
 746                                                        candidate_range_bi,
 747                                                        *bi0);
 748                       consumed = 1;
 749                     }
 750                 }
 751               else
 752                 {
 753                   discard_candidate = 1;
 754                 }
 755             }
 756           else
 757             {
 758               discard_candidate = 1;
 759             }
 760           if (discard_candidate)
 761             {
 762               u32 next_range_bi = candidate_vnb->ip.reass.next_range_bi;
 763               // discard candidate range, probe next range
 764               ip4_reass_remove_range_from_chain (vm, node, rm,
 765                                                  vec_drop_overlap, reass,
 766                                                  prev_range_bi,
 767                                                  candidate_range_bi);
 768               if (~0 != next_range_bi)
 769                 {
 770                   candidate_range_bi = next_range_bi;
 771                   continue;
 772                 }
 773               else
 774                 {
 775                   // special case - last range discarded
 776                   ip4_reass_insert_range_in_chain (vm, rm, reass,
 777                                                    prev_range_bi, *bi0);
 778                   consumed = 1;
 779                 }
 780             }
 781         }
 782       break;
 783     }
 784   if (consumed)
 785     {
 786       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 787         {
 788           ip4_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0);
 789         }
 790     }
 791   if (~0 != reass->last_packet_octet &&
 792       reass->data_len == reass->last_packet_octet + 1)
 793     {
 794       ip4_reass_finalize (vm, node, rm, reass, bi0, next0, error0, next_input,
 795                           vec_drop_compress, vec_drop_overlap);
 796     }
 797   else
 798     {
 799       if (consumed)
 800         {
 801           *bi0 = ~0;
 802         }
 803       else
 804         {
 805           *next0 = next_drop;
 806           *error0 = IP4_ERROR_REASS_DUPLICATE_FRAGMENT;
 807         }
 808     }
 809 }
 810
 811 always_inline uword
 812 ip4_reassembly (vlib_main_t * vm, vlib_node_runtime_t * node,
 813                 vlib_frame_t * frame)
 814 {
 815   u32 *from = vlib_frame_vector_args (frame);
 816   u32 n_left_from, n_left_to_next, *to_next, next_index;
 817   ip4_reass_main_t *rm = &ip4_reass_main;
 818
 819   n_left_from = frame->n_vectors;
 820   next_index = node->cached_next_index;
 821   static u32 *vec_drop_timeout = NULL;  // indexes of buffers which timed out
 822   static u32 *vec_drop_overlap = NULL;  // indexes of buffers which were discarded due to overlap
 823   static u32 *vec_drop_compress = NULL; // indexes of buffers dicarded due to buffer compression
 824   while (n_left_from > 0 || vec_len (vec_drop_timeout) > 0 ||
 825          vec_len (vec_drop_overlap) > 0)
 826     {
 827       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 828
 829       while (vec_len (vec_drop_timeout) > 0 && n_left_to_next > 0)
 830         {
 831           u32 bi = vec_pop (vec_drop_timeout);
 832           vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 833           b->error = node->errors[IP4_ERROR_REASS_TIMEOUT];
 834           to_next[0] = bi;
 835           to_next += 1;
 836           n_left_to_next -= 1;
 837           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 838                                            n_left_to_next, bi,
 839                                            IP4_REASSEMBLY_NEXT_DROP);
 840           IP4_REASS_DEBUG_BUFFER (bi, enqueue_drop_timeout);
 841           ASSERT (rm->buffers_n > 0);
 842           --rm->buffers_n;
 843         }
 844
 845       while (vec_len (vec_drop_overlap) > 0 && n_left_to_next > 0)
 846         {
 847           u32 bi = vec_pop (vec_drop_overlap);
 848           vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 849           b->error = node->errors[IP4_ERROR_REASS_DUPLICATE_FRAGMENT];
 850           to_next[0] = bi;
 851           to_next += 1;
 852           n_left_to_next -= 1;
 853           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 854                                            n_left_to_next, bi,
 855                                            IP4_REASSEMBLY_NEXT_DROP);
 856           IP4_REASS_DEBUG_BUFFER (bi, enqueue_drop_duplicate_fragment);
 857           ASSERT (rm->buffers_n > 0);
 858           --rm->buffers_n;
 859         }
 860
 861       while (vec_len (vec_drop_compress) > 0 && n_left_to_next > 0)
 862         {
 863           u32 bi = vec_pop (vec_drop_compress);
 864           vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 865           b->error = node->errors[IP4_ERROR_NONE];
 866           to_next[0] = bi;
 867           to_next += 1;
 868           n_left_to_next -= 1;
 869           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 870                                            n_left_to_next, bi,
 871                                            IP4_REASSEMBLY_NEXT_DROP);
 872           IP4_REASS_DEBUG_BUFFER (bi, enqueue_drop_compress);
 873           ASSERT (rm->buffers_n > 0);
 874           --rm->buffers_n;
 875         }
 876
 877       while (n_left_from > 0 && n_left_to_next > 0)
 878         {
 879           u32 bi0;
 880           vlib_buffer_t *b0;
 881           u32 next0;            //, error0;
 882
 883           bi0 = from[0];
 884           b0 = vlib_get_buffer (vm, bi0);
 885
 886           ip4_header_t *ip0 = vlib_buffer_get_current (b0);
 887           ip4_reass_key_t k;
 888           k.src.as_u32 = ip0->src_address.as_u32;
 889           k.dst.as_u32 = ip0->dst_address.as_u32;
 890           k.xx_id = vnet_buffer (b0)->sw_if_index[VLIB_RX];
 891           k.frag_id = ip0->fragment_id;
 892           k.proto = ip0->protocol;
 893           k.unused = 0;
 894           ip4_reass_t *reass =
 895             ip4_reass_find_or_create (vm, rm, &k, &vec_drop_timeout);
 896
 897           u32 error0 = IP4_ERROR_NONE;
 898           if (reass)
 899             {
 900               ip4_reass_update (vm, node, rm, reass, &bi0, &next0, &error0,
 901                                 &vec_drop_overlap, &vec_drop_compress,
 902                                 IP4_REASSEMBLY_NEXT_INPUT,
 903                                 IP4_REASSEMBLY_NEXT_DROP);
 904             }
 905           else
 906             {
 907               next0 = IP4_REASSEMBLY_NEXT_DROP;
 908               error0 = IP4_ERROR_REASS_LIMIT_REACHED;
 909             }
 910
 911           b0->error = node->errors[error0];
 912
 913           if (bi0 != ~0)
 914             {
 915               to_next[0] = bi0;
 916               to_next += 1;
 917               n_left_to_next -= 1;
 918               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 919                                                n_left_to_next, bi0, next0);
 920               IP4_REASS_DEBUG_BUFFER (bi0, enqueue_next);
 921             }
 922
 923           from += 1;
 924           n_left_from -= 1;
 925         }
 926
 927       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 928     }
 929
 930   return frame->n_vectors;
 931 }
 932
 933 static char *ip4_reassembly_error_strings[] = {
 934 #define _(sym, string) string,
 935   foreach_ip4_error
 936 #undef _
 937 };
 938
 939 /* *INDENT-OFF* */
 940 VLIB_REGISTER_NODE (ip4_reass_node, static) = {
 941     .function = ip4_reassembly,
 942     .name = "ip4-reassembly",
 943     .vector_size = sizeof (u32),
 944     .format_trace = format_ip4_reass_trace,
 945     .n_errors = ARRAY_LEN (ip4_reassembly_error_strings),
 946     .error_strings = ip4_reassembly_error_strings,
 947     .n_next_nodes = IP4_REASSEMBLY_N_NEXT,
 948     .next_nodes =
 949         {
 950                 [IP4_REASSEMBLY_NEXT_INPUT] = "ip4-input",
 951                 [IP4_REASSEMBLY_NEXT_DROP] = "ip4-drop",
 952         },
 953 };
 954 /* *INDENT-ON* */
 955
 956 VLIB_NODE_FUNCTION_MULTIARCH (ip4_reass_node, ip4_reassembly)
 957      static u32 ip4_reass_get_nbuckets ()
 958 {
 959   ip4_reass_main_t *rm = &ip4_reass_main;
 960   u32 nbuckets;
 961   u8 i;
 962
 963   nbuckets = (u32) (rm->max_reass_n / IP4_REASS_HT_LOAD_FACTOR);
 964
 965   for (i = 0; i < 31; i++)
 966     if ((1 << i) >= nbuckets)
 967       break;
 968   nbuckets = 1 << i;
 969
 970   return nbuckets;
 971 }
 972
 973 typedef enum
 974 {
 975   IP4_EVENT_CONFIG_CHANGED = 1,
 976 } ip4_reass_event_t;
 977
 978 typedef struct
 979 {
 980   int failure;
 981   clib_bihash_24_8_t *new_hash;
 982 } ip4_rehash_cb_ctx;
 983
 984 void
 985 ip4_rehash_cb (clib_bihash_kv_24_8_t * kv, void *_ctx)
 986 {
 987   ip4_rehash_cb_ctx *ctx = _ctx;
 988   if (clib_bihash_add_del_24_8 (ctx->new_hash, kv, 1))
 989     {
 990       ctx->failure = 1;
 991     }
 992 }
 993
 994 vnet_api_error_t
 995 ip4_reass_set (u32 timeout_ms, u32 max_reassemblies,
 996                u32 expire_walk_interval_ms)
 997 {
 998   u32 old_nbuckets = ip4_reass_get_nbuckets ();
 999   ip4_reass_main.timeout_ms = timeout_ms;
1000   ip4_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1001   ip4_reass_main.max_reass_n = max_reassemblies;
1002   ip4_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1003   vlib_process_signal_event (ip4_reass_main.vlib_main,
1004                              ip4_reass_main.ip4_reass_expire_node_idx,
1005                              IP4_EVENT_CONFIG_CHANGED, 0);
1006   u32 new_nbuckets = ip4_reass_get_nbuckets ();
1007   if (ip4_reass_main.max_reass_n > 0 && new_nbuckets > 1 &&
1008       new_nbuckets != old_nbuckets)
1009     {
1010       clib_bihash_24_8_t new_hash;
1011       memset (&new_hash, 0, sizeof (new_hash));
1012       ip4_rehash_cb_ctx ctx;
1013       ctx.failure = 0;
1014       ctx.new_hash = &new_hash;
1015       clib_bihash_init_24_8 (&new_hash, "ip4-reass", new_nbuckets,
1016                              new_nbuckets * 1024);
1017       clib_bihash_foreach_key_value_pair_24_8 (&ip4_reass_main.hash,
1018                                                ip4_rehash_cb, &ctx);
1019       if (ctx.failure)
1020         {
1021           clib_bihash_free_24_8 (&new_hash);
1022           return -1;
1023         }
1024       else
1025         {
1026           clib_bihash_free_24_8 (&ip4_reass_main.hash);
1027           clib_memcpy (&ip4_reass_main.hash, &new_hash,
1028                        sizeof (ip4_reass_main.hash));
1029         }
1030     }
1031   return 0;
1032 }
1033
1034 vnet_api_error_t
1035 ip4_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1036                u32 * expire_walk_interval_ms)
1037 {
1038   *timeout_ms = ip4_reass_main.timeout_ms;
1039   *max_reassemblies = ip4_reass_main.max_reass_n;
1040   *expire_walk_interval_ms = ip4_reass_main.expire_walk_interval_ms;
1041   return 0;
1042 }
1043
1044 clib_error_t *
1045 ip4_reass_init_function (vlib_main_t * vm)
1046 {
1047   ip4_reass_main_t *rm = &ip4_reass_main;
1048   clib_error_t *error = 0;
1049   u32 nbuckets;
1050
1051   rm->vlib_main = vm;
1052   rm->vnet_main = vnet_get_main ();
1053
1054   rm->reass_n = 0;
1055   pool_alloc (rm->pool, rm->max_reass_n);
1056   ip4_reass_set (IP4_REASS_TIMEOUT_DEFAULT_MS,
1057                  IP4_REASS_MAX_REASSEMBLIES_DEAFULT,
1058                  IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1059
1060   nbuckets = ip4_reass_get_nbuckets ();
1061   clib_bihash_init_24_8 (&rm->hash, "ip4-reass", nbuckets, nbuckets * 1024);
1062
1063   vlib_node_t *node = vlib_get_node_by_name (vm, (u8 *) "ip4-drop");
1064   ASSERT (node);
1065   rm->ip4_drop_idx = node->index;
1066   node = vlib_get_node_by_name (vm, (u8 *) "ip4-reassembly-expire-walk");
1067   ASSERT (node);
1068   rm->ip4_reass_expire_node_idx = node->index;
1069   return error;
1070 }
1071
1072 VLIB_INIT_FUNCTION (ip4_reass_init_function);
1073
1074 static uword
1075 ip4_reass_walk_expired (vlib_main_t * vm,
1076                         vlib_node_runtime_t * node, vlib_frame_t * f)
1077 {
1078   ip4_reass_main_t *rm = &ip4_reass_main;
1079   uword event_type, *event_data = 0;
1080
1081   while (true)
1082     {
1083       vlib_process_wait_for_event_or_clock (vm,
1084                                             (f64) rm->expire_walk_interval_ms
1085                                             / (f64) MSEC_PER_SEC);
1086       event_type = vlib_process_get_events (vm, &event_data);
1087
1088       switch (event_type)
1089         {
1090         case ~0:                /* no events => timeout */
1091           /* nothing to do here */
1092           break;
1093         case IP4_EVENT_CONFIG_CHANGED:
1094           break;
1095         default:
1096           clib_warning ("BUG: event type 0x%wx", event_type);
1097           break;
1098         }
1099       f64 now = vlib_time_now (vm);
1100
1101       ip4_reass_t *reass;
1102       u32 *vec_drop_timeout = NULL;
1103       int *pool_indexes_to_free = NULL;
1104
1105       int index;
1106       /* *INDENT-OFF* */
1107       pool_foreach_index (index, rm->pool, ({
1108                             reass = pool_elt_at_index (rm->pool, index);
1109                             if (now > reass->last_heard + rm->timeout)
1110                               {
1111                                 vec_add1 (pool_indexes_to_free, index);
1112                               }
1113                           }));
1114       /* *INDENT-ON* */
1115       int *i;
1116       /* *INDENT-OFF* */
1117       vec_foreach (i, pool_indexes_to_free)
1118       {
1119         ip4_reass_t *reass = pool_elt_at_index (rm->pool, i[0]);
1120         ip4_reass_on_timeout (vm, rm, reass, &vec_drop_timeout);
1121         ip4_reass_free (rm, reass);
1122       }
1123       /* *INDENT-ON* */
1124
1125       while (vec_len (vec_drop_timeout) > 0)
1126         {
1127           vlib_frame_t *f = vlib_get_frame_to_node (vm, rm->ip4_drop_idx);
1128           u32 *to_next = vlib_frame_vector_args (f);
1129           u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
1130           u32 n_trace = 0;
1131           while (vec_len (vec_drop_timeout) > 0 && n_left_to_next > 0)
1132             {
1133               u32 bi = vec_pop (vec_drop_timeout);
1134               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1135               if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1136                 {
1137                   if (pool_is_free_index (vm->trace_main.trace_buffer_pool,
1138                                           b->trace_index))
1139                     {
1140                       /* the trace is gone, don't trace this buffer anymore */
1141                       b->flags &= ~VLIB_BUFFER_IS_TRACED;
1142                     }
1143                   else
1144                     {
1145                       ++n_trace;
1146                     }
1147                 }
1148               b->error = node->errors[IP4_ERROR_REASS_TIMEOUT];
1149               to_next[0] = bi;
1150               ++f->n_vectors;
1151               to_next += 1;
1152               n_left_to_next -= 1;
1153               IP4_REASS_DEBUG_BUFFER (bi, enqueue_drop_timeout_walk);
1154               ASSERT (rm->buffers_n > 0);
1155               --rm->buffers_n;
1156             }
1157           if (PREDICT_FALSE (n_trace > 0))
1158             {
1159               f->flags |= VLIB_FRAME_TRACE;
1160             }
1161           vlib_put_frame_to_node (vm, rm->ip4_drop_idx, f);
1162         }
1163
1164       vec_free (pool_indexes_to_free);
1165       vec_free (vec_drop_timeout);
1166       if (event_data)
1167         {
1168           _vec_len (event_data) = 0;
1169         }
1170     }
1171
1172   return 0;
1173 }
1174
1175 static vlib_node_registration_t ip4_reass_expire_node;
1176
1177 /* *INDENT-OFF* */
1178 VLIB_REGISTER_NODE (ip4_reass_expire_node, static) = {
1179     .function = ip4_reass_walk_expired,
1180     .type = VLIB_NODE_TYPE_PROCESS,
1181     .name = "ip4-reassembly-expire-walk",
1182     .format_trace = format_ip4_reass_trace,
1183     .n_errors = ARRAY_LEN (ip4_reassembly_error_strings),
1184     .error_strings = ip4_reassembly_error_strings,
1185
1186 };
1187 /* *INDENT-ON* */
1188
1189 static u8 *
1190 format_ip4_reass_key (u8 * s, va_list * args)
1191 {
1192   ip4_reass_key_t *key = va_arg (*args, ip4_reass_key_t *);
1193   s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1194               key->xx_id, format_ip4_address, &key->src, format_ip4_address,
1195               &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1196   return s;
1197 }
1198
1199 static u8 *
1200 format_ip4_reass (u8 * s, va_list * args)
1201 {
1202   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1203   ip4_reass_t *reass = va_arg (*args, ip4_reass_t *);
1204
1205   s = format (s, "ID: %u, key: %U\n  first_bi: %u, data_len: %u, "
1206               "last_packet_octet: %u, trace_op_counter: %u\n",
1207               reass->id, format_ip4_reass_key, &reass->key, reass->first_bi,
1208               reass->data_len, reass->last_packet_octet,
1209               reass->trace_op_counter);
1210   u32 bi = reass->first_bi;
1211   u32 counter = 0;
1212   while (~0 != bi)
1213     {
1214       vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1215       vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1216       s = format (s, "  #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1217                   "fragment[%u, %u]\n",
1218                   counter, vnb->ip.reass.range_first,
1219                   vnb->ip.reass.range_last, bi,
1220                   ip4_reass_buffer_get_data_offset_no_check (b),
1221                   ip4_reass_buffer_get_data_len_no_check (b),
1222                   vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1223       if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1224         {
1225           bi = b->next_buffer;
1226         }
1227       else
1228         {
1229           bi = ~0;
1230         }
1231     }
1232   return s;
1233 }
1234
1235 static clib_error_t *
1236 show_ip4_reass (vlib_main_t * vm, unformat_input_t * input,
1237                 CLIB_UNUSED (vlib_cli_command_t * lmd))
1238 {
1239   ip4_reass_main_t *rm = &ip4_reass_main;
1240
1241   vlib_cli_output (vm, "---------------------");
1242   vlib_cli_output (vm, "IP4 reassembly status");
1243   vlib_cli_output (vm, "---------------------");
1244   if (unformat (input, "details"))
1245     {
1246       ip4_reass_t *reass;
1247       /* *INDENT-OFF* */
1248       pool_foreach (reass, rm->pool, {
1249         vlib_cli_output (vm, "%U", format_ip4_reass, vm, reass);
1250       });
1251       /* *INDENT-ON* */
1252     }
1253   vlib_cli_output (vm, "---------------------");
1254   vlib_cli_output (vm, "Current IP4 reassemblies count: %lu\n", rm->reass_n);
1255   vlib_cli_output (vm,
1256                    "Maximum configured concurrent IP4 reassemblies: %lu\n",
1257                    (long unsigned) rm->max_reass_n);
1258   vlib_cli_output (vm, "Buffers in use: %lu\n",
1259                    (long unsigned) rm->buffers_n);
1260   return 0;
1261 }
1262
1263 /* *INDENT-OFF* */
1264 VLIB_CLI_COMMAND (show_ip4_reassembly_cmd, static) = {
1265     .path = "show ip4-reassembly",
1266     .short_help = "show ip4-reassembly [details]",
1267     .function = show_ip4_reass,
1268 };
1269 /* *INDENT-ON* */
1270
1271 /*
1272  * fd.io coding-style-patch-verification: ON
1273  *
1274  * Local Variables:
1275  * eval: (c-set-style "gnu")
1276  * End:
1277  */