src/vnet/ip/ip6_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 IPv6 Reassembly.
  19  *
  20  * This file contains the source code for IPv6 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/ip6_reassembly.h>
  28
  29 #define MSEC_PER_SEC 1000
  30 #define IP6_REASS_TIMEOUT_DEFAULT_MS 100
  31 #define IP6_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default
  32 #define IP6_REASS_MAX_REASSEMBLIES_DEAFULT 1024
  33 #define IP6_REASS_HT_LOAD_FACTOR (0.75)
  34
  35 static vlib_node_registration_t ip6_reass_node;
  36
  37 typedef struct
  38 {
  39   union
  40   {
  41     struct
  42     {
  43       ip6_address_t src;
  44       ip6_address_t dst;
  45       // align by making this 4 octets even though its a 2 octets field
  46       u32 xx_id;
  47       // align by making this 4 octets even though its a 2 octets field
  48       u32 frag_id;
  49       // align by making this 4 octets even though its a 1 octet field
  50       u32 proto;
  51       u32 unused;
  52     };
  53     u64 as_u64[6];
  54   };
  55 } ip6_reass_key_t;
  56
  57 always_inline u32
  58 ip6_reass_buffer_get_data_offset_no_check (vlib_buffer_t * b)
  59 {
  60   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
  61   return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first;
  62 }
  63
  64 always_inline u32
  65 ip6_reass_buffer_get_data_offset (vlib_buffer_t * b)
  66 {
  67   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
  68   ASSERT (vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first);
  69   return ip6_reass_buffer_get_data_offset_no_check (b);
  70 }
  71
  72 always_inline u16
  73 ip6_reass_buffer_get_data_len_no_check (vlib_buffer_t * b)
  74 {
  75   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
  76   return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) -
  77     (vnb->ip.reass.fragment_first + ip6_reass_buffer_get_data_offset (b)) + 1;
  78 }
  79
  80 always_inline u16
  81 ip6_reass_buffer_get_data_len (vlib_buffer_t * b)
  82 {
  83   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
  84   ASSERT (vnb->ip.reass.range_last > vnb->ip.reass.fragment_first);
  85   return ip6_reass_buffer_get_data_len_no_check (b);
  86 }
  87
  88 typedef struct
  89 {
  90   // hash table key
  91   ip6_reass_key_t key;
  92   // time when first packet was received
  93   f64 first_heard;
  94   // time when last packet was received
  95   f64 last_heard;
  96   // internal id of this reassembly
  97   u32 id;
  98   // buffer index of first buffer in this reassembly context
  99   u32 first_bi;
 100   // last octet of packet, ~0 until fragment without more_fragments arrives
 101   u32 last_packet_octet;
 102   // length of data collected so far
 103   u32 data_len;
 104   // trace operation counter
 105   u32 trace_op_counter;
 106 } ip6_reass_t;
 107
 108 typedef struct
 109 {
 110   // IPv6 config
 111   u32 timeout_ms;
 112   f64 timeout;
 113   u32 expire_walk_interval_ms;
 114   u32 max_reass_n;
 115
 116   // IPv6 runtime
 117   ip6_reass_t *pool;
 118   clib_bihash_48_8_t hash;
 119   u32 reass_n;
 120   u32 id_counter;
 121   u32 buffers_n;
 122
 123   // convenience
 124   vlib_main_t *vlib_main;
 125   vnet_main_t *vnet_main;
 126
 127   // node index of ip6-drop node
 128   u32 ip6_drop_idx;
 129   u32 ip6_icmp_error_idx;
 130   u32 ip6_reass_expire_node_idx;
 131
 132 } ip6_reass_main_t;
 133
 134 ip6_reass_main_t ip6_reass_main;
 135
 136 typedef enum
 137 {
 138   IP6_REASSEMBLY_NEXT_INPUT,
 139   IP6_REASSEMBLY_NEXT_DROP,
 140   IP6_REASSEMBLY_NEXT_ICMP_ERROR,
 141   IP6_REASSEMBLY_N_NEXT,
 142 } ip6_reass_next_t;
 143
 144 typedef enum
 145 {
 146   RANGE_NEW,
 147   RANGE_OVERLAP,
 148   ICMP_ERROR_RT_EXCEEDED,
 149   ICMP_ERROR_FL_TOO_BIG,
 150   ICMP_ERROR_FL_NOT_MULT_8,
 151   FINALIZE,
 152 } ip6_reass_trace_operation_e;
 153
 154 typedef struct
 155 {
 156   u16 range_first;
 157   u16 range_last;
 158   u32 range_bi;
 159   i32 data_offset;
 160   u32 data_len;
 161   u32 first_bi;
 162 } ip6_reass_range_trace_t;
 163
 164 typedef struct
 165 {
 166   ip6_reass_trace_operation_e action;
 167   u32 pool_index;
 168   u32 reass_id;
 169   ip6_reass_range_trace_t trace_range;
 170   u32 size_diff;
 171   u32 op_id;
 172   u32 fragment_first;
 173   u32 fragment_last;
 174   u32 total_data_len;
 175 } ip6_reass_trace_t;
 176
 177 static void
 178 ip6_reass_trace_details (vlib_main_t * vm, u32 bi,
 179                          ip6_reass_range_trace_t * trace)
 180 {
 181   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 182   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 183   trace->range_first = vnb->ip.reass.range_first;
 184   trace->range_last = vnb->ip.reass.range_last;
 185   trace->data_offset = ip6_reass_buffer_get_data_offset_no_check (b);
 186   trace->data_len = ip6_reass_buffer_get_data_len_no_check (b);
 187   trace->range_bi = bi;
 188 }
 189
 190 u8 *
 191 format_ip6_reass_range_trace (u8 * s, va_list * args)
 192 {
 193   ip6_reass_range_trace_t *trace = va_arg (*args, ip6_reass_range_trace_t *);
 194   s = format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
 195               trace->range_last, trace->data_offset, trace->data_len,
 196               trace->range_bi);
 197   return s;
 198 }
 199
 200 u8 *
 201 format_ip6_reass_trace (u8 * s, va_list * args)
 202 {
 203   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 204   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 205   ip6_reass_trace_t *t = va_arg (*args, ip6_reass_trace_t *);
 206   s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
 207   u32 indent = format_get_indent (s);
 208   s = format (s, "first bi: %u, data len: %u, ip/fragment[%u, %u]",
 209               t->trace_range.first_bi, t->total_data_len, t->fragment_first,
 210               t->fragment_last);
 211   switch (t->action)
 212     {
 213     case RANGE_NEW:
 214       s = format (s, "\n%Unew %U", format_white_space, indent,
 215                   format_ip6_reass_range_trace, &t->trace_range);
 216       break;
 217     case RANGE_OVERLAP:
 218       s = format (s, "\n%Uoverlap %U", format_white_space, indent,
 219                   format_ip6_reass_range_trace, &t->trace_range);
 220       break;
 221     case ICMP_ERROR_FL_TOO_BIG:
 222       s = format (s, "\n%Uicmp-error - frag_len > 65535 %U",
 223                   format_white_space, indent, format_ip6_reass_range_trace,
 224                   &t->trace_range);
 225       break;
 226     case ICMP_ERROR_FL_NOT_MULT_8:
 227       s = format (s, "\n%Uicmp-error - frag_len mod 8 != 0 %U",
 228                   format_white_space, indent, format_ip6_reass_range_trace,
 229                   &t->trace_range);
 230       break;
 231     case ICMP_ERROR_RT_EXCEEDED:
 232       s = format (s, "\n%Uicmp-error - reassembly time exceeded",
 233                   format_white_space, indent);
 234       break;
 235     case FINALIZE:
 236       s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
 237       break;
 238     }
 239   return s;
 240 }
 241
 242 static void
 243 ip6_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 244                      ip6_reass_main_t * rm, ip6_reass_t * reass,
 245                      u32 bi, ip6_reass_trace_operation_e action,
 246                      u32 size_diff)
 247 {
 248   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 249   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 250   ip6_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 251   t->pool_index = reass - rm->pool;
 252   t->reass_id = reass->id;
 253   t->action = action;
 254   ip6_reass_trace_details (vm, bi, &t->trace_range);
 255   t->size_diff = size_diff;
 256   t->op_id = reass->trace_op_counter;
 257   ++reass->trace_op_counter;
 258   t->fragment_first = vnb->ip.reass.fragment_first;
 259   t->fragment_last = vnb->ip.reass.fragment_last;
 260   t->trace_range.first_bi = reass->first_bi;
 261   t->total_data_len = reass->data_len;
 262 #if 0
 263   static u8 *s = NULL;
 264   s = format (s, "%U", format_ip6_reass_trace, NULL, NULL, t);
 265   printf ("%.*s\n", vec_len (s), s);
 266   fflush (stdout);
 267   vec_reset_length (s);
 268 #endif
 269 }
 270
 271 static void
 272 ip6_reass_free (ip6_reass_main_t * rm, ip6_reass_t * reass)
 273 {
 274   clib_bihash_kv_48_8_t kv;
 275   kv.key[0] = reass->key.as_u64[0];
 276   kv.key[1] = reass->key.as_u64[1];
 277   kv.key[2] = reass->key.as_u64[2];
 278   kv.key[3] = reass->key.as_u64[3];
 279   kv.key[4] = reass->key.as_u64[4];
 280   kv.key[5] = reass->key.as_u64[5];
 281   clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
 282   pool_put (rm->pool, reass);
 283   --rm->reass_n;
 284 }
 285
 286 static void
 287 ip6_reass_drop_all (vlib_main_t * vm, ip6_reass_main_t * rm,
 288                     ip6_reass_t * reass, u32 ** vec_drop_bi)
 289 {
 290   u32 range_bi = reass->first_bi;
 291   vlib_buffer_t *range_b;
 292   vnet_buffer_opaque_t *range_vnb;
 293   while (~0 != range_bi)
 294     {
 295       range_b = vlib_get_buffer (vm, range_bi);
 296       range_vnb = vnet_buffer (range_b);
 297       u32 bi = range_bi;
 298       while (~0 != bi)
 299         {
 300           vec_add1 (*vec_drop_bi, bi);
 301           vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 302           if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 303             {
 304               bi = b->next_buffer;
 305               b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 306             }
 307           else
 308             {
 309               bi = ~0;
 310             }
 311         }
 312       range_bi = range_vnb->ip.reass.next_range_bi;
 313     }
 314 }
 315
 316 static void
 317 ip6_reass_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * node,
 318                       ip6_reass_main_t * rm, ip6_reass_t * reass,
 319                       u32 * icmp_bi, u32 ** vec_timeout)
 320 {
 321   if (~0 == reass->first_bi)
 322     {
 323       return;
 324     }
 325   vlib_buffer_t *b = vlib_get_buffer (vm, reass->first_bi);
 326   if (0 == vnet_buffer (b)->ip.reass.fragment_first)
 327     {
 328       *icmp_bi = reass->first_bi;
 329       if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
 330         {
 331           ip6_reass_add_trace (vm, node, rm, reass, reass->first_bi,
 332                                ICMP_ERROR_RT_EXCEEDED, 0);
 333         }
 334       // fragment with offset zero received - send icmp message back
 335       if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 336         {
 337           // separate first buffer from chain and steer it towards icmp node
 338           b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 339           reass->first_bi = b->next_buffer;
 340         }
 341       else
 342         {
 343           reass->first_bi = vnet_buffer (b)->ip.reass.next_range_bi;
 344         }
 345       icmp6_error_set_vnet_buffer (b, ICMP6_time_exceeded,
 346                                    ICMP6_time_exceeded_fragment_reassembly_time_exceeded,
 347                                    0);
 348     }
 349   ip6_reass_drop_all (vm, rm, reass, vec_timeout);
 350 }
 351
 352 static ip6_reass_t *
 353 ip6_reass_find_or_create (vlib_main_t * vm,
 354                           vlib_node_runtime_t * node,
 355                           ip6_reass_main_t * rm,
 356                           ip6_reass_key_t * k, u32 * icmp_bi,
 357                           u32 ** vec_timeout)
 358 {
 359   ip6_reass_t *reass = NULL;
 360   f64 now = vlib_time_now (rm->vlib_main);
 361   clib_bihash_kv_48_8_t kv, value;
 362   kv.key[0] = k->as_u64[0];
 363   kv.key[1] = k->as_u64[1];
 364   kv.key[2] = k->as_u64[2];
 365   kv.key[3] = k->as_u64[3];
 366   kv.key[4] = k->as_u64[4];
 367   kv.key[5] = k->as_u64[5];
 368
 369   if (!clib_bihash_search_48_8 (&rm->hash, &kv, &value))
 370     {
 371       reass = pool_elt_at_index (rm->pool, value.value);
 372       if (now > reass->last_heard + rm->timeout)
 373         {
 374           ip6_reass_on_timeout (vm, node, rm, reass, icmp_bi, vec_timeout);
 375           ip6_reass_free (rm, reass);
 376           reass = NULL;
 377         }
 378     }
 379
 380   if (reass)
 381     {
 382       reass->last_heard = now;
 383       return reass;
 384     }
 385
 386   if (rm->reass_n >= rm->max_reass_n)
 387     {
 388       reass = NULL;
 389       return reass;
 390     }
 391   else
 392     {
 393       pool_get (rm->pool, reass);
 394       memset (reass, 0, sizeof (*reass));
 395       reass->id = rm->id_counter;
 396       ++rm->id_counter;
 397       reass->first_bi = ~0;
 398       reass->last_packet_octet = ~0;
 399       reass->data_len = 0;
 400       ++rm->reass_n;
 401     }
 402
 403   reass->key.as_u64[0] = kv.key[0] = k->as_u64[0];
 404   reass->key.as_u64[1] = kv.key[1] = k->as_u64[1];
 405   reass->key.as_u64[2] = kv.key[2] = k->as_u64[2];
 406   reass->key.as_u64[3] = kv.key[3] = k->as_u64[3];
 407   reass->key.as_u64[4] = kv.key[4] = k->as_u64[4];
 408   reass->key.as_u64[5] = kv.key[5] = k->as_u64[5];
 409   kv.value = reass - rm->pool;
 410   reass->last_heard = now;
 411
 412   if (clib_bihash_add_del_48_8 (&rm->hash, &kv, 1))
 413     {
 414       ip6_reass_free (rm, reass);
 415       reass = NULL;
 416     }
 417
 418   return reass;
 419 }
 420
 421 void
 422 ip6_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
 423                     ip6_reass_main_t * rm, ip6_reass_t * reass, u32 * bi0,
 424                     u32 * next0, vlib_error_t * error0, u32 next_input,
 425                     u32 ** vec_drop_compress)
 426 {
 427   ASSERT (~0 != reass->first_bi);
 428   *bi0 = reass->first_bi;
 429   *next0 = next_input;
 430   *error0 = IP6_ERROR_NONE;
 431   ip6_frag_hdr_t *frag_hdr;
 432   vlib_buffer_t *last_b = NULL;
 433   u32 sub_chain_bi = reass->first_bi;
 434   u32 total_length = 0;
 435   u32 buf_cnt = 0;
 436   u32 dropped_cnt = 0;
 437   do
 438     {
 439       u32 tmp_bi = sub_chain_bi;
 440       vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
 441       u32 data_len = ip6_reass_buffer_get_data_len (tmp);
 442       u32 trim_front = vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
 443         sizeof (*frag_hdr) + ip6_reass_buffer_get_data_offset (tmp);
 444       u32 trim_end =
 445         vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
 446       if (tmp_bi == reass->first_bi)
 447         {
 448           /* first buffer - keep ip6 header */
 449           ASSERT (0 == ip6_reass_buffer_get_data_offset (tmp));
 450           trim_front = 0;
 451           trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
 452             (vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
 453              sizeof (*frag_hdr));
 454           ASSERT (vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0);
 455         }
 456       u32 keep_data =
 457         vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
 458       while (1)
 459         {
 460           ++buf_cnt;
 461           if (trim_front)
 462             {
 463               if (trim_front > tmp->current_length)
 464                 {
 465                   /* drop whole buffer */
 466                   vec_add1 (*vec_drop_compress, tmp_bi);
 467                   ++dropped_cnt;
 468                   trim_front -= tmp->current_length;
 469                   ASSERT (tmp->flags & VLIB_BUFFER_NEXT_PRESENT);
 470                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 471                   tmp_bi = tmp->next_buffer;
 472                   tmp = vlib_get_buffer (vm, tmp_bi);
 473                   continue;
 474                 }
 475               else
 476                 {
 477                   vlib_buffer_advance (tmp, trim_front);
 478                   trim_front = 0;
 479                 }
 480             }
 481           if (keep_data)
 482             {
 483               if (last_b)
 484                 {
 485                   last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
 486                   last_b->next_buffer = tmp_bi;
 487                 }
 488               last_b = tmp;
 489               if (keep_data <= tmp->current_length)
 490                 {
 491                   tmp->current_length = keep_data;
 492                   keep_data = 0;
 493                 }
 494               else
 495                 {
 496                   keep_data -= tmp->current_length;
 497                   ASSERT (tmp->flags & VLIB_BUFFER_NEXT_PRESENT);
 498                 }
 499               total_length += tmp->current_length;
 500             }
 501           else
 502             {
 503               vec_add1 (*vec_drop_compress, tmp_bi);
 504               ASSERT (reass->first_bi != tmp_bi);
 505               ++dropped_cnt;
 506             }
 507           if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 508             {
 509               tmp_bi = tmp->next_buffer;
 510               tmp = vlib_get_buffer (vm, tmp->next_buffer);
 511             }
 512           else
 513             {
 514               break;
 515             }
 516         }
 517       sub_chain_bi =
 518         vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
 519         reass.next_range_bi;
 520     }
 521   while (~0 != sub_chain_bi);
 522   last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 523   vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
 524   ASSERT (total_length >= first_b->current_length);
 525   total_length -= first_b->current_length;
 526   first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
 527   first_b->total_length_not_including_first_buffer = total_length;
 528   // drop fragment header
 529   vnet_buffer_opaque_t *first_b_vnb = vnet_buffer (first_b);
 530   ip6_header_t *ip = vlib_buffer_get_current (first_b);
 531   u16 ip6_frag_hdr_offset = first_b_vnb->ip.reass.ip6_frag_hdr_offset;
 532   ip6_ext_header_t *prev_hdr;
 533   ip6_ext_header_find_t (ip, prev_hdr, frag_hdr,
 534                          IP_PROTOCOL_IPV6_FRAGMENTATION);
 535   if (prev_hdr)
 536     {
 537       prev_hdr->next_hdr = frag_hdr->next_hdr;
 538     }
 539   else
 540     {
 541       ip->protocol = frag_hdr->next_hdr;
 542     }
 543   ASSERT ((u8 *) frag_hdr - (u8 *) ip == ip6_frag_hdr_offset);
 544   memmove (frag_hdr, (u8 *) frag_hdr + sizeof (*frag_hdr),
 545            first_b->current_length - ip6_frag_hdr_offset -
 546            sizeof (ip6_frag_hdr_t));
 547   first_b->current_length -= sizeof (*frag_hdr);
 548   ip->payload_length =
 549     clib_host_to_net_u16 (total_length + first_b->current_length -
 550                           sizeof (*ip));
 551   ip6_reass_free (rm, reass);
 552   vlib_buffer_chain_compress (vm, first_b, vec_drop_compress);
 553   if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
 554     {
 555       ip6_reass_add_trace (vm, node, rm, reass, reass->first_bi, FINALIZE, 0);
 556 #if 0
 557       // following code does a hexdump of packet fragments to stdout ...
 558       do
 559         {
 560           u32 bi = reass->first_bi;
 561           u8 *s = NULL;
 562           while (~0 != bi)
 563             {
 564               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 565               s = format (s, "%u: %U\n", bi, format_hexdump,
 566                           vlib_buffer_get_current (b), b->current_length);
 567               if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 568                 {
 569                   bi = b->next_buffer;
 570                 }
 571               else
 572                 {
 573                   break;
 574                 }
 575             }
 576           printf ("%.*s\n", vec_len (s), s);
 577           fflush (stdout);
 578           vec_free (s);
 579         }
 580       while (0);
 581 #endif
 582     }
 583   reass = NULL;
 584 }
 585
 586 static u32
 587 ip6_reass_get_buffer_chain_length (vlib_main_t * vm, vlib_buffer_t * b)
 588 {
 589   u32 len = 0;
 590   while (b)
 591     {
 592       ++len;
 593       if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
 594         {
 595           b = vlib_get_buffer (vm, b->next_buffer);
 596         }
 597       else
 598         {
 599           break;
 600         }
 601     }
 602   return len;
 603 }
 604
 605 static void
 606 ip6_reass_insert_range_in_chain (vlib_main_t * vm,
 607                                  ip6_reass_main_t * rm,
 608                                  ip6_reass_t * reass,
 609                                  u32 prev_range_bi, u32 new_next_bi)
 610 {
 611
 612   vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
 613   vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
 614   if (~0 != prev_range_bi)
 615     {
 616       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 617       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 618       new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
 619       prev_vnb->ip.reass.next_range_bi = new_next_bi;
 620     }
 621   else
 622     {
 623       if (~0 != reass->first_bi)
 624         {
 625           new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
 626         }
 627       reass->first_bi = new_next_bi;
 628     }
 629   reass->data_len += ip6_reass_buffer_get_data_len (new_next_b);
 630   rm->buffers_n += ip6_reass_get_buffer_chain_length (vm, new_next_b);
 631 }
 632
 633 void
 634 ip6_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 635                   ip6_reass_main_t * rm, ip6_reass_t * reass, u32 * bi0,
 636                   u32 * next0, vlib_error_t * error0,
 637                   ip6_frag_hdr_t * frag_hdr, u32 ** vec_drop_overlap,
 638                   u32 ** vec_drop_compress, u32 next_input, u32 next_drop,
 639                   u32 next_icmp_error)
 640 {
 641   int consumed = 0;
 642   vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
 643   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 644   fvnb->ip.reass.ip6_frag_hdr_offset =
 645     (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
 646   ip6_header_t *fip = vlib_buffer_get_current (fb);
 647   ASSERT (fb->current_length > sizeof (*fip));
 648   ASSERT (fvnb->ip.reass.ip6_frag_hdr_offset > 0 &&
 649           fvnb->ip.reass.ip6_frag_hdr_offset < fb->current_length);
 650   u32 fragment_first = fvnb->ip.reass.fragment_first =
 651     ip6_frag_hdr_offset_bytes (frag_hdr);
 652   u32 fragment_length =
 653     vlib_buffer_length_in_chain (vm, fb) -
 654     (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 655   u32 fragment_last = fvnb->ip.reass.fragment_last =
 656     fragment_first + fragment_length - 1;
 657   int more_fragments = ip6_frag_hdr_more (frag_hdr);
 658   u32 candidate_range_bi = reass->first_bi;
 659   u32 prev_range_bi = ~0;
 660   fvnb->ip.reass.range_first = fragment_first;
 661   fvnb->ip.reass.range_last = fragment_last;
 662   fvnb->ip.reass.next_range_bi = ~0;
 663   if (more_fragments && 0 != fragment_length % 8)
 664     {
 665       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 666         {
 667           ip6_reass_add_trace (vm, node, rm, reass, *bi0,
 668                                ICMP_ERROR_FL_NOT_MULT_8, 0);
 669         }
 670       *next0 = next_icmp_error;
 671       icmp6_error_set_vnet_buffer (fb, ICMP6_parameter_problem,
 672                                    ICMP6_parameter_problem_erroneous_header_field,
 673                                    (u8 *) & fip->payload_length - (u8 *) fip);
 674       return;
 675     }
 676   if (fragment_first + fragment_length > 65535)
 677     {
 678       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 679         {
 680           ip6_reass_add_trace (vm, node, rm, reass, *bi0,
 681                                ICMP_ERROR_FL_TOO_BIG, 0);
 682         }
 683       *next0 = next_icmp_error;
 684       ip6_header_t *ip0 = vlib_buffer_get_current (fb);
 685       icmp6_error_set_vnet_buffer (fb, ICMP6_parameter_problem,
 686                                    ICMP6_parameter_problem_erroneous_header_field,
 687                                    (u8 *) & frag_hdr->fragment_offset_and_more
 688                                    - (u8 *) ip0);
 689       return;
 690     }
 691   if (!more_fragments)
 692     {
 693       reass->last_packet_octet = fragment_last;
 694     }
 695   if (~0 == reass->first_bi)
 696     {
 697       // starting a new reassembly
 698       ip6_reass_insert_range_in_chain (vm, rm, reass, prev_range_bi, *bi0);
 699       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 700         {
 701           ip6_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0);
 702         }
 703       *bi0 = ~0;
 704       return;
 705     }
 706   fvnb->ip.reass.estimated_mtu =
 707     clib_min (clib_net_to_host_u16 (fip->payload_length),
 708               fvnb->ip.reass.estimated_mtu);
 709   while (~0 != candidate_range_bi)
 710     {
 711       vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
 712       vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
 713       if (fragment_first > candidate_vnb->ip.reass.range_last)
 714         {
 715           // this fragments starts after candidate range
 716           prev_range_bi = candidate_range_bi;
 717           candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
 718           if (candidate_vnb->ip.reass.range_last < fragment_last &&
 719               ~0 == candidate_range_bi)
 720             {
 721               // special case - this fragment falls beyond all known ranges
 722               ip6_reass_insert_range_in_chain (vm, rm, reass, prev_range_bi,
 723                                                *bi0);
 724               consumed = 1;
 725               break;
 726             }
 727           continue;
 728         }
 729       if (fragment_last < candidate_vnb->ip.reass.range_first)
 730         {
 731           // this fragment ends before candidate range without any overlap
 732           ip6_reass_insert_range_in_chain (vm, rm, reass, prev_range_bi,
 733                                            *bi0);
 734           consumed = 1;
 735         }
 736       else if (fragment_first == candidate_vnb->ip.reass.range_first &&
 737                fragment_last == candidate_vnb->ip.reass.range_last)
 738         {
 739           // duplicate fragment - ignore
 740         }
 741       else
 742         {
 743           // overlapping fragment - not allowed by RFC 8200
 744           ip6_reass_drop_all (vm, rm, reass, vec_drop_overlap);
 745           ip6_reass_free (rm, reass);
 746           if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 747             {
 748               ip6_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_OVERLAP,
 749                                    0);
 750             }
 751           *next0 = next_drop;
 752           *error0 = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT;
 753         }
 754       break;
 755     }
 756   if (consumed)
 757     {
 758       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 759         {
 760           ip6_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0);
 761         }
 762     }
 763   if (~0 != reass->last_packet_octet &&
 764       reass->data_len == reass->last_packet_octet + 1)
 765     {
 766       ip6_reass_finalize (vm, node, rm, reass, bi0, next0, error0, next_input,
 767                           vec_drop_compress);
 768     }
 769   else
 770     {
 771       if (consumed)
 772         {
 773           *bi0 = ~0;
 774         }
 775       else
 776         {
 777           *next0 = next_drop;
 778           *error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT;
 779         }
 780     }
 781 }
 782
 783 always_inline uword
 784 ip6_reassembly (vlib_main_t * vm, vlib_node_runtime_t * node,
 785                 vlib_frame_t * frame)
 786 {
 787   u32 *from = vlib_frame_vector_args (frame);
 788   u32 n_left_from, n_left_to_next, *to_next, next_index;
 789   ip6_reass_main_t *rm = &ip6_reass_main;
 790
 791   n_left_from = frame->n_vectors;
 792   next_index = node->cached_next_index;
 793   static u32 *vec_timeout = NULL;       // indexes of buffers which timed out
 794   static u32 *vec_drop_overlap = NULL;  // indexes of buffers dropped due to overlap
 795   static u32 *vec_drop_compress = NULL; // indexes of buffers dropped due to buffer compression
 796   while (n_left_from > 0 || vec_len (vec_timeout) > 0 ||
 797          vec_len (vec_drop_overlap) > 0)
 798     {
 799       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 800
 801       while (vec_len (vec_timeout) > 0 && n_left_to_next > 0)
 802         {
 803           u32 bi = vec_pop (vec_timeout);
 804           vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 805           b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
 806           to_next[0] = bi;
 807           to_next += 1;
 808           n_left_to_next -= 1;
 809           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 810                                            n_left_to_next, bi,
 811                                            IP6_REASSEMBLY_NEXT_DROP);
 812           ASSERT (rm->buffers_n > 0);
 813           --rm->buffers_n;
 814         }
 815
 816       while (vec_len (vec_drop_overlap) > 0 && n_left_to_next > 0)
 817         {
 818           u32 bi = vec_pop (vec_drop_overlap);
 819           vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 820           b->error = node->errors[IP6_ERROR_REASS_OVERLAPPING_FRAGMENT];
 821           to_next[0] = bi;
 822           to_next += 1;
 823           n_left_to_next -= 1;
 824           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 825                                            n_left_to_next, bi,
 826                                            IP6_REASSEMBLY_NEXT_DROP);
 827           ASSERT (rm->buffers_n > 0);
 828           --rm->buffers_n;
 829         }
 830
 831       while (vec_len (vec_drop_compress) > 0 && n_left_to_next > 0)
 832         {
 833           u32 bi = vec_pop (vec_drop_compress);
 834           vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 835           b->error = node->errors[IP6_ERROR_NONE];
 836           to_next[0] = bi;
 837           to_next += 1;
 838           n_left_to_next -= 1;
 839           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 840                                            n_left_to_next, bi,
 841                                            IP6_REASSEMBLY_NEXT_DROP);
 842           ASSERT (rm->buffers_n > 0);
 843           --rm->buffers_n;
 844         }
 845
 846       while (n_left_from > 0 && n_left_to_next > 0)
 847         {
 848           u32 bi0;
 849           vlib_buffer_t *b0;
 850           u32 next0;            //, error0;
 851
 852           bi0 = from[0];
 853           b0 = vlib_get_buffer (vm, bi0);
 854
 855           ip6_header_t *ip0 = vlib_buffer_get_current (b0);
 856           ip6_frag_hdr_t *frag_hdr;
 857           ip6_ext_header_t *prev_hdr;
 858           ip6_ext_header_find_t (ip0, prev_hdr, frag_hdr,
 859                                  IP_PROTOCOL_IPV6_FRAGMENTATION);
 860           if (0 == ip6_frag_hdr_offset (frag_hdr))
 861             {
 862               // first fragment - verify upper-layer is present
 863               ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr;
 864               while (ip6_ext_hdr (tmp->next_hdr))
 865                 {
 866                   tmp = ip6_ext_next_header (tmp);
 867                 }
 868               if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr)
 869                 {
 870                   icmp6_error_set_vnet_buffer (b0, ICMP6_parameter_problem,
 871                                                ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
 872                                                0);
 873                   b0->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
 874
 875                   to_next[0] = bi0;
 876                   to_next += 1;
 877                   n_left_to_next -= 1;
 878                   vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 879                                                    to_next, n_left_to_next,
 880                                                    bi0,
 881                                                    IP6_REASSEMBLY_NEXT_ICMP_ERROR);
 882                   goto next;
 883                 }
 884             }
 885           vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
 886             (u8 *) frag_hdr - (u8 *) ip0;
 887
 888           ip6_reass_key_t k;
 889           k.src.as_u64[0] = ip0->src_address.as_u64[0];
 890           k.src.as_u64[1] = ip0->src_address.as_u64[1];
 891           k.dst.as_u64[0] = ip0->dst_address.as_u64[0];
 892           k.dst.as_u64[1] = ip0->dst_address.as_u64[1];
 893           k.xx_id = vnet_buffer (b0)->sw_if_index[VLIB_RX];
 894           k.frag_id = frag_hdr->identification;
 895           k.proto = ip0->protocol;
 896           k.unused = 0;
 897           u32 icmp_bi = ~0;
 898           ip6_reass_t *reass =
 899             ip6_reass_find_or_create (vm, node, rm, &k, &icmp_bi,
 900                                       &vec_timeout);
 901
 902           u32 error0 = IP6_ERROR_NONE;
 903           if (reass)
 904             {
 905               ip6_reass_update (vm, node, rm, reass, &bi0, &next0, &error0,
 906                                 frag_hdr, &vec_drop_overlap,
 907                                 &vec_drop_compress, IP6_REASSEMBLY_NEXT_INPUT,
 908                                 IP6_REASSEMBLY_NEXT_DROP,
 909                                 IP6_REASSEMBLY_NEXT_ICMP_ERROR);
 910             }
 911           else
 912             {
 913               next0 = IP6_REASSEMBLY_NEXT_DROP;
 914               error0 = IP6_ERROR_REASS_LIMIT_REACHED;
 915             }
 916
 917           b0->error = node->errors[error0];
 918
 919           if (~0 != bi0)
 920             {
 921               to_next[0] = bi0;
 922               to_next += 1;
 923               n_left_to_next -= 1;
 924               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 925                                                n_left_to_next, bi0, next0);
 926             }
 927
 928           if (~0 != icmp_bi)
 929             {
 930               next0 = IP6_REASSEMBLY_NEXT_ICMP_ERROR;
 931               to_next[0] = icmp_bi;
 932               to_next += 1;
 933               n_left_to_next -= 1;
 934               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 935                                                n_left_to_next, icmp_bi,
 936                                                next0);
 937             }
 938         next:
 939           from += 1;
 940           n_left_from -= 1;
 941         }
 942
 943       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 944     }
 945
 946   return frame->n_vectors;
 947 }
 948
 949 static char *ip6_reassembly_error_strings[] = {
 950 #define _(sym, string) string,
 951   foreach_ip6_error
 952 #undef _
 953 };
 954
 955 /* *INDENT-OFF* */
 956 VLIB_REGISTER_NODE (ip6_reass_node, static) = {
 957     .function = ip6_reassembly,
 958     .name = "ip6-reassembly",
 959     .vector_size = sizeof (u32),
 960     .format_trace = format_ip6_reass_trace,
 961     .n_errors = ARRAY_LEN (ip6_reassembly_error_strings),
 962     .error_strings = ip6_reassembly_error_strings,
 963     .n_next_nodes = IP6_REASSEMBLY_N_NEXT,
 964     .next_nodes =
 965         {
 966                 [IP6_REASSEMBLY_NEXT_INPUT] = "ip6-input",
 967                 [IP6_REASSEMBLY_NEXT_DROP] = "ip6-drop",
 968                 [IP6_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
 969         },
 970 };
 971 /* *INDENT-ON* */
 972
 973 VLIB_NODE_FUNCTION_MULTIARCH (ip6_reass_node, ip6_reassembly)
 974      static u32 ip6_reass_get_nbuckets ()
 975 {
 976   ip6_reass_main_t *rm = &ip6_reass_main;
 977   u32 nbuckets;
 978   u8 i;
 979
 980   nbuckets = (u32) (rm->max_reass_n / IP6_REASS_HT_LOAD_FACTOR);
 981
 982   for (i = 0; i < 31; i++)
 983     if ((1 << i) >= nbuckets)
 984       break;
 985   nbuckets = 1 << i;
 986
 987   return nbuckets;
 988 }
 989
 990 typedef enum
 991 {
 992   IP6_EVENT_CONFIG_CHANGED = 1,
 993 } ip6_reass_event_t;
 994
 995 typedef struct
 996 {
 997   int failure;
 998   clib_bihash_48_8_t *new_hash;
 999 } ip6_rehash_cb_ctx;
1000
1001 void
1002 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
1003 {
1004   ip6_rehash_cb_ctx *ctx = _ctx;
1005   if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
1006     {
1007       ctx->failure = 1;
1008     }
1009 }
1010
1011 vnet_api_error_t
1012 ip6_reass_set (u32 timeout_ms, u32 max_reassemblies,
1013                u32 expire_walk_interval_ms)
1014 {
1015   u32 old_nbuckets = ip6_reass_get_nbuckets ();
1016   ip6_reass_main.timeout_ms = timeout_ms;
1017   ip6_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1018   ip6_reass_main.max_reass_n = max_reassemblies;
1019   ip6_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1020   vlib_process_signal_event (ip6_reass_main.vlib_main,
1021                              ip6_reass_main.ip6_reass_expire_node_idx,
1022                              IP6_EVENT_CONFIG_CHANGED, 0);
1023   u32 new_nbuckets = ip6_reass_get_nbuckets ();
1024   if (ip6_reass_main.max_reass_n > 0 && new_nbuckets > 1 &&
1025       new_nbuckets != old_nbuckets)
1026     {
1027       clib_bihash_48_8_t new_hash;
1028       memset (&new_hash, 0, sizeof (new_hash));
1029       ip6_rehash_cb_ctx ctx;
1030       ctx.failure = 0;
1031       ctx.new_hash = &new_hash;
1032       clib_bihash_init_48_8 (&new_hash, "ip6-reass", new_nbuckets,
1033                              new_nbuckets * 1024);
1034       clib_bihash_foreach_key_value_pair_48_8 (&ip6_reass_main.hash,
1035                                                ip6_rehash_cb, &ctx);
1036       if (ctx.failure)
1037         {
1038           clib_bihash_free_48_8 (&new_hash);
1039           return -1;
1040         }
1041       else
1042         {
1043           clib_bihash_free_48_8 (&ip6_reass_main.hash);
1044           clib_memcpy (&ip6_reass_main.hash, &new_hash,
1045                        sizeof (ip6_reass_main.hash));
1046         }
1047     }
1048   return 0;
1049 }
1050
1051 vnet_api_error_t
1052 ip6_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1053                u32 * expire_walk_interval_ms)
1054 {
1055   *timeout_ms = ip6_reass_main.timeout_ms;
1056   *max_reassemblies = ip6_reass_main.max_reass_n;
1057   *expire_walk_interval_ms = ip6_reass_main.expire_walk_interval_ms;
1058   return 0;
1059 }
1060
1061 clib_error_t *
1062 ip6_reass_init_function (vlib_main_t * vm)
1063 {
1064   ip6_reass_main_t *rm = &ip6_reass_main;
1065   clib_error_t *error = 0;
1066   u32 nbuckets;
1067   vlib_node_t *node;
1068
1069   rm->vlib_main = vm;
1070   rm->vnet_main = vnet_get_main ();
1071
1072   rm->reass_n = 0;
1073   pool_alloc (rm->pool, rm->max_reass_n);
1074
1075   node = vlib_get_node_by_name (vm, (u8 *) "ip6-reassembly-expire-walk");
1076   ASSERT (node);
1077   rm->ip6_reass_expire_node_idx = node->index;
1078
1079   ip6_reass_set (IP6_REASS_TIMEOUT_DEFAULT_MS,
1080                  IP6_REASS_MAX_REASSEMBLIES_DEAFULT,
1081                  IP6_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1082
1083   nbuckets = ip6_reass_get_nbuckets ();
1084   clib_bihash_init_48_8 (&rm->hash, "ip6-reass", nbuckets, nbuckets * 1024);
1085
1086   node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
1087   ASSERT (node);
1088   rm->ip6_drop_idx = node->index;
1089   node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
1090   ASSERT (node);
1091   rm->ip6_icmp_error_idx = node->index;
1092
1093   if ((error = vlib_call_init_function (vm, ip_main_init)))
1094     return error;
1095   ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
1096                          ip6_reass_node.index);
1097   return error;
1098 }
1099
1100 VLIB_INIT_FUNCTION (ip6_reass_init_function);
1101
1102 static uword
1103 ip6_reass_walk_expired (vlib_main_t * vm,
1104                         vlib_node_runtime_t * node, vlib_frame_t * f)
1105 {
1106   ip6_reass_main_t *rm = &ip6_reass_main;
1107   uword event_type, *event_data = 0;
1108
1109   while (true)
1110     {
1111       vlib_process_wait_for_event_or_clock (vm,
1112                                             (f64) rm->expire_walk_interval_ms
1113                                             / (f64) MSEC_PER_SEC);
1114       event_type = vlib_process_get_events (vm, &event_data);
1115
1116       switch (event_type)
1117         {
1118         case ~0:                /* no events => timeout */
1119           /* nothing to do here */
1120           break;
1121         case IP6_EVENT_CONFIG_CHANGED:
1122           break;
1123         default:
1124           clib_warning ("BUG: event type 0x%wx", event_type);
1125           break;
1126         }
1127       f64 now = vlib_time_now (vm);
1128
1129       ip6_reass_t *reass;
1130       u32 *vec_timeout = NULL;
1131       int *pool_indexes_to_free = NULL;
1132
1133       int index;
1134       /* *INDENT-OFF* */
1135       pool_foreach_index (index, rm->pool, ({
1136                             reass = pool_elt_at_index (rm->pool, index);
1137                             if (now > reass->last_heard + rm->timeout)
1138                               {
1139                                 vec_add1 (pool_indexes_to_free, index);
1140                               }
1141                           }));
1142       /* *INDENT-ON* */
1143       int *i;
1144       u32 *vec_icmp_bi = NULL;
1145       /* *INDENT-OFF* */
1146       vec_foreach (i, pool_indexes_to_free)
1147       {
1148         ip6_reass_t *reass = pool_elt_at_index (rm->pool, i[0]);
1149         u32 icmp_bi = ~0;
1150         ip6_reass_on_timeout (vm, node, rm, reass, &icmp_bi, &vec_timeout);
1151         if (~0 != icmp_bi)
1152           {
1153             vec_add1 (vec_icmp_bi, icmp_bi);
1154           }
1155         ip6_reass_free (rm, reass);
1156       }
1157       /* *INDENT-ON* */
1158
1159       while (vec_len (vec_timeout) > 0)
1160         {
1161           vlib_frame_t *f = vlib_get_frame_to_node (vm, rm->ip6_drop_idx);
1162           u32 *to_next = vlib_frame_vector_args (f);
1163           u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
1164           u32 n_trace = 0;
1165           while (vec_len (vec_timeout) > 0 && n_left_to_next > 0)
1166             {
1167               u32 bi = vec_pop (vec_timeout);
1168               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1169               if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1170                 {
1171                   if (pool_is_free_index (vm->trace_main.trace_buffer_pool,
1172                                           b->trace_index))
1173                     {
1174                       /* the trace is gone, don't trace this buffer anymore */
1175                       b->flags &= ~VLIB_BUFFER_IS_TRACED;
1176                     }
1177                   else
1178                     {
1179                       ++n_trace;
1180                     }
1181                 }
1182               b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
1183               to_next[0] = bi;
1184               ++f->n_vectors;
1185               to_next += 1;
1186               n_left_to_next -= 1;
1187               ASSERT (rm->buffers_n > 0);
1188               --rm->buffers_n;
1189             }
1190           if (PREDICT_FALSE (n_trace > 0))
1191             {
1192               f->flags |= VLIB_FRAME_TRACE;
1193             }
1194           vlib_put_frame_to_node (vm, rm->ip6_drop_idx, f);
1195         }
1196
1197       while (vec_len (vec_icmp_bi) > 0)
1198         {
1199           vlib_frame_t *f =
1200             vlib_get_frame_to_node (vm, rm->ip6_icmp_error_idx);
1201           u32 *to_next = vlib_frame_vector_args (f);
1202           u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
1203           u32 n_trace = 0;
1204           while (vec_len (vec_icmp_bi) > 0 && n_left_to_next > 0)
1205             {
1206               u32 bi = vec_pop (vec_icmp_bi);
1207               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1208               if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1209                 {
1210                   if (pool_is_free_index (vm->trace_main.trace_buffer_pool,
1211                                           b->trace_index))
1212                     {
1213                       /* the trace is gone, don't trace this buffer anymore */
1214                       b->flags &= ~VLIB_BUFFER_IS_TRACED;
1215                     }
1216                   else
1217                     {
1218                       ++n_trace;
1219                     }
1220                 }
1221               b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
1222               to_next[0] = bi;
1223               ++f->n_vectors;
1224               to_next += 1;
1225               n_left_to_next -= 1;
1226               ASSERT (rm->buffers_n > 0);
1227               --rm->buffers_n;
1228             }
1229           if (PREDICT_FALSE (n_trace > 0))
1230             {
1231               f->flags |= VLIB_FRAME_TRACE;
1232             }
1233           vlib_put_frame_to_node (vm, rm->ip6_icmp_error_idx, f);
1234         }
1235
1236       vec_free (pool_indexes_to_free);
1237       vec_free (vec_timeout);
1238       vec_free (vec_icmp_bi);
1239       if (event_data)
1240         {
1241           _vec_len (event_data) = 0;
1242         }
1243     }
1244
1245   return 0;
1246 }
1247
1248 static vlib_node_registration_t ip6_reass_expire_node;
1249
1250 /* *INDENT-OFF* */
1251 VLIB_REGISTER_NODE (ip6_reass_expire_node, static) = {
1252     .function = ip6_reass_walk_expired,
1253     .format_trace = format_ip6_reass_trace,
1254     .type = VLIB_NODE_TYPE_PROCESS,
1255     .name = "ip6-reassembly-expire-walk",
1256
1257     .n_errors = ARRAY_LEN (ip6_reassembly_error_strings),
1258     .error_strings = ip6_reassembly_error_strings,
1259
1260 };
1261 /* *INDENT-ON* */
1262
1263 static u8 *
1264 format_ip6_reass_key (u8 * s, va_list * args)
1265 {
1266   ip6_reass_key_t *key = va_arg (*args, ip6_reass_key_t *);
1267   s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1268               key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1269               &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1270   return s;
1271 }
1272
1273 static u8 *
1274 format_ip6_reass (u8 * s, va_list * args)
1275 {
1276   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1277   ip6_reass_t *reass = va_arg (*args, ip6_reass_t *);
1278
1279   s = format (s, "ID: %u, key: %U\n  first_bi: %u, data_len: %u, "
1280               "last_packet_octet: %u, trace_op_counter: %u\n",
1281               reass->id, format_ip6_reass_key, &reass->key, reass->first_bi,
1282               reass->data_len, reass->last_packet_octet,
1283               reass->trace_op_counter);
1284   u32 bi = reass->first_bi;
1285   u32 counter = 0;
1286   while (~0 != bi)
1287     {
1288       vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1289       vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1290       s = format (s, "  #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1291                   "fragment[%u, %u]\n",
1292                   counter, vnb->ip.reass.range_first,
1293                   vnb->ip.reass.range_last, bi,
1294                   ip6_reass_buffer_get_data_offset_no_check (b),
1295                   ip6_reass_buffer_get_data_len_no_check (b),
1296                   vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1297       if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1298         {
1299           bi = b->next_buffer;
1300         }
1301       else
1302         {
1303           bi = ~0;
1304         }
1305     }
1306   return s;
1307 }
1308
1309 static clib_error_t *
1310 show_ip6_reass (vlib_main_t * vm, unformat_input_t * input,
1311                 CLIB_UNUSED (vlib_cli_command_t * lmd))
1312 {
1313   ip6_reass_main_t *rm = &ip6_reass_main;
1314
1315   vlib_cli_output (vm, "---------------------");
1316   vlib_cli_output (vm, "IP6 reassembly status");
1317   vlib_cli_output (vm, "---------------------");
1318   if (unformat (input, "details"))
1319     {
1320       ip6_reass_t *reass;
1321       /* *INDENT-OFF* */
1322       pool_foreach (reass, rm->pool, {
1323         vlib_cli_output (vm, "%U", format_ip6_reass, vm, reass);
1324       });
1325       /* *INDENT-ON* */
1326     }
1327   vlib_cli_output (vm, "---------------------");
1328   vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n", rm->reass_n);
1329   vlib_cli_output (vm,
1330                    "Maximum configured concurrent IP6 reassemblies: %lu\n",
1331                    (long unsigned) rm->max_reass_n);
1332   vlib_cli_output (vm, "Buffers in use: %lu\n",
1333                    (long unsigned) rm->buffers_n);
1334   return 0;
1335 }
1336
1337 /* *INDENT-OFF* */
1338 VLIB_CLI_COMMAND (show_ip6_reassembly_cmd, static) = {
1339     .path = "show ip6-reassembly",
1340     .short_help = "show ip6-reassembly [details]",
1341     .function = show_ip6_reass,
1342 };
1343 /* *INDENT-ON* */
1344
1345 /*
1346  * fd.io coding-style-patch-verification: ON
1347  *
1348  * Local Variables:
1349  * eval: (c-set-style "gnu")
1350  * End:
1351  */