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_DEFAULT 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 last packet was received
  93   f64 last_heard;
  94   // internal id of this reassembly
  95   u64 id;
  96   // buffer index of first buffer in this reassembly context
  97   u32 first_bi;
  98   // last octet of packet, ~0 until fragment without more_fragments arrives
  99   u32 last_packet_octet;
 100   // length of data collected so far
 101   u32 data_len;
 102   // trace operation counter
 103   u32 trace_op_counter;
 104   // next index - used by non-feature node
 105   u8 next_index;
 106   // minimum fragment length for this reassembly - used to estimate MTU
 107   u16 min_fragment_length;
 108 } ip6_reass_t;
 109
 110 typedef struct
 111 {
 112   ip6_reass_t *pool;
 113   u32 reass_n;
 114   u32 buffers_n;
 115   u32 id_counter;
 116   clib_spinlock_t lock;
 117 } ip6_reass_per_thread_t;
 118
 119 typedef struct
 120 {
 121   // IPv6 config
 122   u32 timeout_ms;
 123   f64 timeout;
 124   u32 expire_walk_interval_ms;
 125   u32 max_reass_n;
 126
 127   // IPv6 runtime
 128   clib_bihash_48_8_t hash;
 129
 130   // per-thread data
 131   ip6_reass_per_thread_t *per_thread_data;
 132
 133   // convenience
 134   vlib_main_t *vlib_main;
 135   vnet_main_t *vnet_main;
 136
 137   // node index of ip6-drop node
 138   u32 ip6_drop_idx;
 139   u32 ip6_icmp_error_idx;
 140   u32 ip6_reass_expire_node_idx;
 141
 142 } ip6_reass_main_t;
 143
 144 ip6_reass_main_t ip6_reass_main;
 145
 146 typedef enum
 147 {
 148   IP6_REASSEMBLY_NEXT_INPUT,
 149   IP6_REASSEMBLY_NEXT_DROP,
 150   IP6_REASSEMBLY_NEXT_ICMP_ERROR,
 151   IP6_REASSEMBLY_N_NEXT,
 152 } ip6_reass_next_t;
 153
 154 typedef enum
 155 {
 156   RANGE_NEW,
 157   RANGE_OVERLAP,
 158   ICMP_ERROR_RT_EXCEEDED,
 159   ICMP_ERROR_FL_TOO_BIG,
 160   ICMP_ERROR_FL_NOT_MULT_8,
 161   FINALIZE,
 162 } ip6_reass_trace_operation_e;
 163
 164 typedef struct
 165 {
 166   u16 range_first;
 167   u16 range_last;
 168   u32 range_bi;
 169   i32 data_offset;
 170   u32 data_len;
 171   u32 first_bi;
 172 } ip6_reass_range_trace_t;
 173
 174 typedef struct
 175 {
 176   ip6_reass_trace_operation_e action;
 177   u32 reass_id;
 178   ip6_reass_range_trace_t trace_range;
 179   u32 size_diff;
 180   u32 op_id;
 181   u32 fragment_first;
 182   u32 fragment_last;
 183   u32 total_data_len;
 184 } ip6_reass_trace_t;
 185
 186 static void
 187 ip6_reass_trace_details (vlib_main_t * vm, u32 bi,
 188                          ip6_reass_range_trace_t * trace)
 189 {
 190   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 191   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 192   trace->range_first = vnb->ip.reass.range_first;
 193   trace->range_last = vnb->ip.reass.range_last;
 194   trace->data_offset = ip6_reass_buffer_get_data_offset_no_check (b);
 195   trace->data_len = ip6_reass_buffer_get_data_len_no_check (b);
 196   trace->range_bi = bi;
 197 }
 198
 199 static u8 *
 200 format_ip6_reass_range_trace (u8 * s, va_list * args)
 201 {
 202   ip6_reass_range_trace_t *trace = va_arg (*args, ip6_reass_range_trace_t *);
 203   s = format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
 204               trace->range_last, trace->data_offset, trace->data_len,
 205               trace->range_bi);
 206   return s;
 207 }
 208
 209 static u8 *
 210 format_ip6_reass_trace (u8 * s, va_list * args)
 211 {
 212   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 213   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 214   ip6_reass_trace_t *t = va_arg (*args, ip6_reass_trace_t *);
 215   s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
 216   u32 indent = format_get_indent (s);
 217   s = format (s, "first bi: %u, data len: %u, ip/fragment[%u, %u]",
 218               t->trace_range.first_bi, t->total_data_len, t->fragment_first,
 219               t->fragment_last);
 220   switch (t->action)
 221     {
 222     case RANGE_NEW:
 223       s = format (s, "\n%Unew %U", format_white_space, indent,
 224                   format_ip6_reass_range_trace, &t->trace_range);
 225       break;
 226     case RANGE_OVERLAP:
 227       s = format (s, "\n%Uoverlap %U", format_white_space, indent,
 228                   format_ip6_reass_range_trace, &t->trace_range);
 229       break;
 230     case ICMP_ERROR_FL_TOO_BIG:
 231       s = format (s, "\n%Uicmp-error - frag_len > 65535 %U",
 232                   format_white_space, indent, format_ip6_reass_range_trace,
 233                   &t->trace_range);
 234       break;
 235     case ICMP_ERROR_FL_NOT_MULT_8:
 236       s = format (s, "\n%Uicmp-error - frag_len mod 8 != 0 %U",
 237                   format_white_space, indent, format_ip6_reass_range_trace,
 238                   &t->trace_range);
 239       break;
 240     case ICMP_ERROR_RT_EXCEEDED:
 241       s = format (s, "\n%Uicmp-error - reassembly time exceeded",
 242                   format_white_space, indent);
 243       break;
 244     case FINALIZE:
 245       s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
 246       break;
 247     }
 248   return s;
 249 }
 250
 251 static void
 252 ip6_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 253                      ip6_reass_main_t * rm, ip6_reass_t * reass,
 254                      u32 bi, ip6_reass_trace_operation_e action,
 255                      u32 size_diff)
 256 {
 257   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 258   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 259   if (pool_is_free_index (vm->trace_main.trace_buffer_pool, b->trace_index))
 260     {
 261       // this buffer's trace is gone
 262       b->flags &= ~VLIB_BUFFER_IS_TRACED;
 263       return;
 264     }
 265   ip6_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 266   t->reass_id = reass->id;
 267   t->action = action;
 268   ip6_reass_trace_details (vm, bi, &t->trace_range);
 269   t->size_diff = size_diff;
 270   t->op_id = reass->trace_op_counter;
 271   ++reass->trace_op_counter;
 272   t->fragment_first = vnb->ip.reass.fragment_first;
 273   t->fragment_last = vnb->ip.reass.fragment_last;
 274   t->trace_range.first_bi = reass->first_bi;
 275   t->total_data_len = reass->data_len;
 276 #if 0
 277   static u8 *s = NULL;
 278   s = format (s, "%U", format_ip6_reass_trace, NULL, NULL, t);
 279   printf ("%.*s\n", vec_len (s), s);
 280   fflush (stdout);
 281   vec_reset_length (s);
 282 #endif
 283 }
 284
 285 always_inline void
 286 ip6_reass_free (ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt,
 287                 ip6_reass_t * reass)
 288 {
 289   clib_bihash_kv_48_8_t kv;
 290   kv.key[0] = reass->key.as_u64[0];
 291   kv.key[1] = reass->key.as_u64[1];
 292   kv.key[2] = reass->key.as_u64[2];
 293   kv.key[3] = reass->key.as_u64[3];
 294   kv.key[4] = reass->key.as_u64[4];
 295   kv.key[5] = reass->key.as_u64[5];
 296   clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
 297   pool_put (rt->pool, reass);
 298   --rt->reass_n;
 299 }
 300
 301 always_inline void
 302 ip6_reass_drop_all (vlib_main_t * vm, ip6_reass_main_t * rm,
 303                     ip6_reass_t * reass, u32 ** vec_drop_bi)
 304 {
 305   u32 range_bi = reass->first_bi;
 306   vlib_buffer_t *range_b;
 307   vnet_buffer_opaque_t *range_vnb;
 308   while (~0 != range_bi)
 309     {
 310       range_b = vlib_get_buffer (vm, range_bi);
 311       range_vnb = vnet_buffer (range_b);
 312       u32 bi = range_bi;
 313       while (~0 != bi)
 314         {
 315           vec_add1 (*vec_drop_bi, bi);
 316           vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 317           if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 318             {
 319               bi = b->next_buffer;
 320               b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 321             }
 322           else
 323             {
 324               bi = ~0;
 325             }
 326         }
 327       range_bi = range_vnb->ip.reass.next_range_bi;
 328     }
 329 }
 330
 331 always_inline void
 332 ip6_reass_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * node,
 333                       ip6_reass_main_t * rm, ip6_reass_t * reass,
 334                       u32 * icmp_bi, u32 ** vec_timeout)
 335 {
 336   if (~0 == reass->first_bi)
 337     {
 338       return;
 339     }
 340   vlib_buffer_t *b = vlib_get_buffer (vm, reass->first_bi);
 341   if (0 == vnet_buffer (b)->ip.reass.fragment_first)
 342     {
 343       *icmp_bi = reass->first_bi;
 344       if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
 345         {
 346           ip6_reass_add_trace (vm, node, rm, reass, reass->first_bi,
 347                                ICMP_ERROR_RT_EXCEEDED, 0);
 348         }
 349       // fragment with offset zero received - send icmp message back
 350       if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 351         {
 352           // separate first buffer from chain and steer it towards icmp node
 353           b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 354           reass->first_bi = b->next_buffer;
 355         }
 356       else
 357         {
 358           reass->first_bi = vnet_buffer (b)->ip.reass.next_range_bi;
 359         }
 360       icmp6_error_set_vnet_buffer (b, ICMP6_time_exceeded,
 361                                    ICMP6_time_exceeded_fragment_reassembly_time_exceeded,
 362                                    0);
 363     }
 364   ip6_reass_drop_all (vm, rm, reass, vec_timeout);
 365 }
 366
 367 always_inline ip6_reass_t *
 368 ip6_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
 369                           ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt,
 370                           ip6_reass_key_t * k, u32 * icmp_bi,
 371                           u32 ** vec_timeout)
 372 {
 373   ip6_reass_t *reass = NULL;
 374   f64 now = vlib_time_now (rm->vlib_main);
 375   clib_bihash_kv_48_8_t kv, value;
 376   kv.key[0] = k->as_u64[0];
 377   kv.key[1] = k->as_u64[1];
 378   kv.key[2] = k->as_u64[2];
 379   kv.key[3] = k->as_u64[3];
 380   kv.key[4] = k->as_u64[4];
 381   kv.key[5] = k->as_u64[5];
 382
 383   if (!clib_bihash_search_48_8 (&rm->hash, &kv, &value))
 384     {
 385       reass = pool_elt_at_index (rt->pool, value.value);
 386       if (now > reass->last_heard + rm->timeout)
 387         {
 388           ip6_reass_on_timeout (vm, node, rm, reass, icmp_bi, vec_timeout);
 389           ip6_reass_free (rm, rt, reass);
 390           reass = NULL;
 391         }
 392     }
 393
 394   if (reass)
 395     {
 396       reass->last_heard = now;
 397       return reass;
 398     }
 399
 400   if (rt->reass_n >= rm->max_reass_n)
 401     {
 402       reass = NULL;
 403       return reass;
 404     }
 405   else
 406     {
 407       pool_get (rt->pool, reass);
 408       memset (reass, 0, sizeof (*reass));
 409       reass->id =
 410         ((u64) os_get_thread_index () * 1000000000) + rt->id_counter;
 411       ++rt->id_counter;
 412       reass->first_bi = ~0;
 413       reass->last_packet_octet = ~0;
 414       reass->data_len = 0;
 415       ++rt->reass_n;
 416     }
 417
 418   reass->key.as_u64[0] = kv.key[0] = k->as_u64[0];
 419   reass->key.as_u64[1] = kv.key[1] = k->as_u64[1];
 420   reass->key.as_u64[2] = kv.key[2] = k->as_u64[2];
 421   reass->key.as_u64[3] = kv.key[3] = k->as_u64[3];
 422   reass->key.as_u64[4] = kv.key[4] = k->as_u64[4];
 423   reass->key.as_u64[5] = kv.key[5] = k->as_u64[5];
 424   kv.value = reass - rt->pool;
 425   reass->last_heard = now;
 426
 427   if (clib_bihash_add_del_48_8 (&rm->hash, &kv, 1))
 428     {
 429       ip6_reass_free (rm, rt, reass);
 430       reass = NULL;
 431     }
 432
 433   return reass;
 434 }
 435
 436 always_inline void
 437 ip6_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
 438                     ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt,
 439                     ip6_reass_t * reass, u32 * bi0, u32 * next0,
 440                     vlib_error_t * error0, u32 ** vec_drop_compress,
 441                     bool is_feature)
 442 {
 443   ASSERT (~0 != reass->first_bi);
 444   *bi0 = reass->first_bi;
 445   *error0 = IP6_ERROR_NONE;
 446   ip6_frag_hdr_t *frag_hdr;
 447   vlib_buffer_t *last_b = NULL;
 448   u32 sub_chain_bi = reass->first_bi;
 449   u32 total_length = 0;
 450   u32 buf_cnt = 0;
 451   u32 dropped_cnt = 0;
 452   do
 453     {
 454       u32 tmp_bi = sub_chain_bi;
 455       vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
 456       u32 data_len = ip6_reass_buffer_get_data_len (tmp);
 457       u32 trim_front = vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
 458         sizeof (*frag_hdr) + ip6_reass_buffer_get_data_offset (tmp);
 459       u32 trim_end =
 460         vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
 461       if (tmp_bi == reass->first_bi)
 462         {
 463           /* first buffer - keep ip6 header */
 464           ASSERT (0 == ip6_reass_buffer_get_data_offset (tmp));
 465           trim_front = 0;
 466           trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
 467             (vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
 468              sizeof (*frag_hdr));
 469           ASSERT (vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0);
 470         }
 471       u32 keep_data =
 472         vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
 473       while (1)
 474         {
 475           ++buf_cnt;
 476           if (trim_front)
 477             {
 478               if (trim_front > tmp->current_length)
 479                 {
 480                   /* drop whole buffer */
 481                   vec_add1 (*vec_drop_compress, tmp_bi);
 482                   ++dropped_cnt;
 483                   trim_front -= tmp->current_length;
 484                   ASSERT (tmp->flags & VLIB_BUFFER_NEXT_PRESENT);
 485                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 486                   tmp_bi = tmp->next_buffer;
 487                   tmp = vlib_get_buffer (vm, tmp_bi);
 488                   continue;
 489                 }
 490               else
 491                 {
 492                   vlib_buffer_advance (tmp, trim_front);
 493                   trim_front = 0;
 494                 }
 495             }
 496           if (keep_data)
 497             {
 498               if (last_b)
 499                 {
 500                   last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
 501                   last_b->next_buffer = tmp_bi;
 502                 }
 503               last_b = tmp;
 504               if (keep_data <= tmp->current_length)
 505                 {
 506                   tmp->current_length = keep_data;
 507                   keep_data = 0;
 508                 }
 509               else
 510                 {
 511                   keep_data -= tmp->current_length;
 512                   ASSERT (tmp->flags & VLIB_BUFFER_NEXT_PRESENT);
 513                 }
 514               total_length += tmp->current_length;
 515             }
 516           else
 517             {
 518               vec_add1 (*vec_drop_compress, tmp_bi);
 519               ASSERT (reass->first_bi != tmp_bi);
 520               ++dropped_cnt;
 521             }
 522           if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 523             {
 524               tmp_bi = tmp->next_buffer;
 525               tmp = vlib_get_buffer (vm, tmp->next_buffer);
 526             }
 527           else
 528             {
 529               break;
 530             }
 531         }
 532       sub_chain_bi =
 533         vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
 534         reass.next_range_bi;
 535     }
 536   while (~0 != sub_chain_bi);
 537   last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 538   vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
 539   ASSERT (total_length >= first_b->current_length);
 540   total_length -= first_b->current_length;
 541   first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
 542   first_b->total_length_not_including_first_buffer = total_length;
 543   // drop fragment header
 544   vnet_buffer_opaque_t *first_b_vnb = vnet_buffer (first_b);
 545   ip6_header_t *ip = vlib_buffer_get_current (first_b);
 546   u16 ip6_frag_hdr_offset = first_b_vnb->ip.reass.ip6_frag_hdr_offset;
 547   ip6_ext_header_t *prev_hdr;
 548   ip6_ext_header_find_t (ip, prev_hdr, frag_hdr,
 549                          IP_PROTOCOL_IPV6_FRAGMENTATION);
 550   if (prev_hdr)
 551     {
 552       prev_hdr->next_hdr = frag_hdr->next_hdr;
 553     }
 554   else
 555     {
 556       ip->protocol = frag_hdr->next_hdr;
 557     }
 558   ASSERT ((u8 *) frag_hdr - (u8 *) ip == ip6_frag_hdr_offset);
 559   memmove (frag_hdr, (u8 *) frag_hdr + sizeof (*frag_hdr),
 560            first_b->current_length - ip6_frag_hdr_offset -
 561            sizeof (ip6_frag_hdr_t));
 562   first_b->current_length -= sizeof (*frag_hdr);
 563   ip->payload_length =
 564     clib_host_to_net_u16 (total_length + first_b->current_length -
 565                           sizeof (*ip));
 566   vlib_buffer_chain_compress (vm, first_b, vec_drop_compress);
 567   if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
 568     {
 569       ip6_reass_add_trace (vm, node, rm, reass, reass->first_bi, FINALIZE, 0);
 570 #if 0
 571       // following code does a hexdump of packet fragments to stdout ...
 572       do
 573         {
 574           u32 bi = reass->first_bi;
 575           u8 *s = NULL;
 576           while (~0 != bi)
 577             {
 578               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 579               s = format (s, "%u: %U\n", bi, format_hexdump,
 580                           vlib_buffer_get_current (b), b->current_length);
 581               if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 582                 {
 583                   bi = b->next_buffer;
 584                 }
 585               else
 586                 {
 587                   break;
 588                 }
 589             }
 590           printf ("%.*s\n", vec_len (s), s);
 591           fflush (stdout);
 592           vec_free (s);
 593         }
 594       while (0);
 595 #endif
 596     }
 597   if (is_feature)
 598     {
 599       *next0 = IP6_REASSEMBLY_NEXT_INPUT;
 600     }
 601   else
 602     {
 603       *next0 = reass->next_index;
 604     }
 605   vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
 606   ip6_reass_free (rm, rt, reass);
 607   reass = NULL;
 608 }
 609
 610 always_inline u32
 611 ip6_reass_get_buffer_chain_length (vlib_main_t * vm, vlib_buffer_t * b)
 612 {
 613   u32 len = 0;
 614   while (b)
 615     {
 616       ++len;
 617       if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
 618         {
 619           b = vlib_get_buffer (vm, b->next_buffer);
 620         }
 621       else
 622         {
 623           break;
 624         }
 625     }
 626   return len;
 627 }
 628
 629 always_inline void
 630 ip6_reass_insert_range_in_chain (vlib_main_t * vm, ip6_reass_main_t * rm,
 631                                  ip6_reass_per_thread_t * rt,
 632                                  ip6_reass_t * reass, u32 prev_range_bi,
 633                                  u32 new_next_bi)
 634 {
 635
 636   vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
 637   vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
 638   if (~0 != prev_range_bi)
 639     {
 640       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 641       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 642       new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
 643       prev_vnb->ip.reass.next_range_bi = new_next_bi;
 644     }
 645   else
 646     {
 647       if (~0 != reass->first_bi)
 648         {
 649           new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
 650         }
 651       reass->first_bi = new_next_bi;
 652     }
 653   reass->data_len += ip6_reass_buffer_get_data_len (new_next_b);
 654   rt->buffers_n += ip6_reass_get_buffer_chain_length (vm, new_next_b);
 655 }
 656
 657 always_inline void
 658 ip6_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 659                   ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt,
 660                   ip6_reass_t * reass, u32 * bi0, u32 * next0,
 661                   vlib_error_t * error0, ip6_frag_hdr_t * frag_hdr,
 662                   u32 ** vec_drop_overlap, u32 ** vec_drop_compress,
 663                   bool is_feature)
 664 {
 665   int consumed = 0;
 666   vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
 667   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 668   fvnb->ip.reass.ip6_frag_hdr_offset =
 669     (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
 670   ip6_header_t *fip = vlib_buffer_get_current (fb);
 671   ASSERT (fb->current_length > sizeof (*fip));
 672   ASSERT (fvnb->ip.reass.ip6_frag_hdr_offset > 0 &&
 673           fvnb->ip.reass.ip6_frag_hdr_offset < fb->current_length);
 674   u32 fragment_first = fvnb->ip.reass.fragment_first =
 675     ip6_frag_hdr_offset_bytes (frag_hdr);
 676   u32 fragment_length =
 677     vlib_buffer_length_in_chain (vm, fb) -
 678     (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 679   u32 fragment_last = fvnb->ip.reass.fragment_last =
 680     fragment_first + fragment_length - 1;
 681   int more_fragments = ip6_frag_hdr_more (frag_hdr);
 682   u32 candidate_range_bi = reass->first_bi;
 683   u32 prev_range_bi = ~0;
 684   fvnb->ip.reass.range_first = fragment_first;
 685   fvnb->ip.reass.range_last = fragment_last;
 686   fvnb->ip.reass.next_range_bi = ~0;
 687   if (!more_fragments)
 688     {
 689       reass->last_packet_octet = fragment_last;
 690     }
 691   if (~0 == reass->first_bi)
 692     {
 693       // starting a new reassembly
 694       ip6_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi,
 695                                        *bi0);
 696       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 697         {
 698           ip6_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0);
 699         }
 700       reass->min_fragment_length = clib_net_to_host_u16 (fip->payload_length);
 701       *bi0 = ~0;
 702       return;
 703     }
 704   reass->min_fragment_length =
 705     clib_min (clib_net_to_host_u16 (fip->payload_length),
 706               fvnb->ip.reass.estimated_mtu);
 707   while (~0 != candidate_range_bi)
 708     {
 709       vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
 710       vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
 711       if (fragment_first > candidate_vnb->ip.reass.range_last)
 712         {
 713           // this fragments starts after candidate range
 714           prev_range_bi = candidate_range_bi;
 715           candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
 716           if (candidate_vnb->ip.reass.range_last < fragment_last &&
 717               ~0 == candidate_range_bi)
 718             {
 719               // special case - this fragment falls beyond all known ranges
 720               ip6_reass_insert_range_in_chain (vm, rm, rt, reass,
 721                                                prev_range_bi, *bi0);
 722               consumed = 1;
 723               break;
 724             }
 725           continue;
 726         }
 727       if (fragment_last < candidate_vnb->ip.reass.range_first)
 728         {
 729           // this fragment ends before candidate range without any overlap
 730           ip6_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi,
 731                                            *bi0);
 732           consumed = 1;
 733         }
 734       else if (fragment_first == candidate_vnb->ip.reass.range_first &&
 735                fragment_last == candidate_vnb->ip.reass.range_last)
 736         {
 737           // duplicate fragment - ignore
 738         }
 739       else
 740         {
 741           // overlapping fragment - not allowed by RFC 8200
 742           ip6_reass_drop_all (vm, rm, reass, vec_drop_overlap);
 743           ip6_reass_free (rm, rt, reass);
 744           if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 745             {
 746               ip6_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_OVERLAP,
 747                                    0);
 748             }
 749           *next0 = IP6_REASSEMBLY_NEXT_DROP;
 750           *error0 = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT;
 751         }
 752       break;
 753     }
 754   if (consumed)
 755     {
 756       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 757         {
 758           ip6_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0);
 759         }
 760     }
 761   if (~0 != reass->last_packet_octet &&
 762       reass->data_len == reass->last_packet_octet + 1)
 763     {
 764       ip6_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
 765                           vec_drop_compress, is_feature);
 766     }
 767   else
 768     {
 769       if (consumed)
 770         {
 771           *bi0 = ~0;
 772         }
 773       else
 774         {
 775           *next0 = IP6_REASSEMBLY_NEXT_DROP;
 776           ;
 777           *error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT;
 778         }
 779     }
 780 }
 781
 782 always_inline bool
 783 ip6_reass_verify_upper_layer_present (vlib_node_runtime_t * node,
 784                                       vlib_buffer_t * b,
 785                                       ip6_frag_hdr_t * frag_hdr)
 786 {
 787   ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr;
 788   while (ip6_ext_hdr (tmp->next_hdr))
 789     {
 790       tmp = ip6_ext_next_header (tmp);
 791     }
 792   if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr)
 793     {
 794       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 795                                    ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
 796                                    0);
 797       b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
 798
 799       return false;
 800     }
 801   return true;
 802 }
 803
 804 always_inline bool
 805 ip6_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
 806                                       vlib_node_runtime_t * node,
 807                                       vlib_buffer_t * b,
 808                                       ip6_frag_hdr_t * frag_hdr)
 809 {
 810   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 811   ip6_header_t *ip = vlib_buffer_get_current (b);
 812   int more_fragments = ip6_frag_hdr_more (frag_hdr);
 813   u32 fragment_length =
 814     vlib_buffer_length_in_chain (vm, b) -
 815     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 816   if (more_fragments && 0 != fragment_length % 8)
 817     {
 818       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 819                                    ICMP6_parameter_problem_erroneous_header_field,
 820                                    (u8 *) & ip->payload_length - (u8 *) ip);
 821       return false;
 822     }
 823   return true;
 824 }
 825
 826 always_inline bool
 827 ip6_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
 828                                      vlib_node_runtime_t * node,
 829                                      vlib_buffer_t * b,
 830                                      ip6_frag_hdr_t * frag_hdr)
 831 {
 832   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 833   u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
 834   u32 fragment_length =
 835     vlib_buffer_length_in_chain (vm, b) -
 836     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 837   if (fragment_first + fragment_length > 65535)
 838     {
 839       ip6_header_t *ip0 = vlib_buffer_get_current (b);
 840       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 841                                    ICMP6_parameter_problem_erroneous_header_field,
 842                                    (u8 *) & frag_hdr->fragment_offset_and_more
 843                                    - (u8 *) ip0);
 844       return false;
 845     }
 846   return true;
 847 }
 848
 849 always_inline uword
 850 ip6_reassembly_inline (vlib_main_t * vm,
 851                        vlib_node_runtime_t * node,
 852                        vlib_frame_t * frame, bool is_feature)
 853 {
 854   u32 *from = vlib_frame_vector_args (frame);
 855   u32 n_left_from, n_left_to_next, *to_next, next_index;
 856   ip6_reass_main_t *rm = &ip6_reass_main;
 857   ip6_reass_per_thread_t *rt = &rm->per_thread_data[os_get_thread_index ()];
 858   clib_spinlock_lock (&rt->lock);
 859
 860   n_left_from = frame->n_vectors;
 861   next_index = node->cached_next_index;
 862   static u32 *vec_timeout = NULL;       // indexes of buffers which timed out
 863   static u32 *vec_drop_overlap = NULL;  // indexes of buffers dropped due to overlap
 864   static u32 *vec_drop_compress = NULL; // indexes of buffers dropped due to buffer compression
 865   while (n_left_from > 0 || vec_len (vec_timeout) > 0 ||
 866          vec_len (vec_drop_overlap) > 0 || vec_len (vec_drop_compress) > 0)
 867     {
 868       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 869
 870       while (vec_len (vec_timeout) > 0 && n_left_to_next > 0)
 871         {
 872           u32 bi = vec_pop (vec_timeout);
 873           vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 874           b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
 875           to_next[0] = bi;
 876           to_next += 1;
 877           n_left_to_next -= 1;
 878           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 879                                            n_left_to_next, bi,
 880                                            IP6_REASSEMBLY_NEXT_DROP);
 881           ASSERT (rt->buffers_n > 0);
 882           --rt->buffers_n;
 883         }
 884
 885       while (vec_len (vec_drop_overlap) > 0 && n_left_to_next > 0)
 886         {
 887           u32 bi = vec_pop (vec_drop_overlap);
 888           vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 889           b->error = node->errors[IP6_ERROR_REASS_OVERLAPPING_FRAGMENT];
 890           to_next[0] = bi;
 891           to_next += 1;
 892           n_left_to_next -= 1;
 893           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 894                                            n_left_to_next, bi,
 895                                            IP6_REASSEMBLY_NEXT_DROP);
 896           ASSERT (rt->buffers_n > 0);
 897           --rt->buffers_n;
 898         }
 899
 900       while (vec_len (vec_drop_compress) > 0 && n_left_to_next > 0)
 901         {
 902           u32 bi = vec_pop (vec_drop_compress);
 903           vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 904           b->error = node->errors[IP6_ERROR_NONE];
 905           to_next[0] = bi;
 906           to_next += 1;
 907           n_left_to_next -= 1;
 908           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 909                                            n_left_to_next, bi,
 910                                            IP6_REASSEMBLY_NEXT_DROP);
 911           ASSERT (rt->buffers_n > 0);
 912           --rt->buffers_n;
 913         }
 914
 915       while (n_left_from > 0 && n_left_to_next > 0)
 916         {
 917           u32 bi0;
 918           vlib_buffer_t *b0;
 919           u32 next0;
 920           u32 error0 = IP6_ERROR_NONE;
 921           u32 icmp_bi = ~0;
 922
 923           bi0 = from[0];
 924           b0 = vlib_get_buffer (vm, bi0);
 925
 926           ip6_header_t *ip0 = vlib_buffer_get_current (b0);
 927           ip6_frag_hdr_t *frag_hdr;
 928           ip6_ext_header_t *prev_hdr;
 929           ip6_ext_header_find_t (ip0, prev_hdr, frag_hdr,
 930                                  IP_PROTOCOL_IPV6_FRAGMENTATION);
 931           if (!frag_hdr)
 932             {
 933               // this is a regular packet - no fragmentation
 934               next0 = IP6_REASSEMBLY_NEXT_INPUT;
 935               goto skip_reass;
 936             }
 937           if (0 == ip6_frag_hdr_offset (frag_hdr))
 938             {
 939               // first fragment - verify upper-layer is present
 940               if (!ip6_reass_verify_upper_layer_present (node, b0, frag_hdr))
 941                 {
 942                   next0 = IP6_REASSEMBLY_NEXT_ICMP_ERROR;
 943                   goto skip_reass;
 944                 }
 945             }
 946           if (!ip6_reass_verify_fragment_multiple_8 (vm, node, b0, frag_hdr)
 947               || !ip6_reass_verify_packet_size_lt_64k (vm, node, b0,
 948                                                        frag_hdr))
 949             {
 950               next0 = IP6_REASSEMBLY_NEXT_ICMP_ERROR;
 951               goto skip_reass;
 952             }
 953           vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
 954             (u8 *) frag_hdr - (u8 *) ip0;
 955
 956           ip6_reass_key_t k;
 957           k.src.as_u64[0] = ip0->src_address.as_u64[0];
 958           k.src.as_u64[1] = ip0->src_address.as_u64[1];
 959           k.dst.as_u64[0] = ip0->dst_address.as_u64[0];
 960           k.dst.as_u64[1] = ip0->dst_address.as_u64[1];
 961           k.xx_id = vnet_buffer (b0)->sw_if_index[VLIB_RX];
 962           k.frag_id = frag_hdr->identification;
 963           k.proto = ip0->protocol;
 964           k.unused = 0;
 965           ip6_reass_t *reass =
 966             ip6_reass_find_or_create (vm, node, rm, rt, &k, &icmp_bi,
 967                                       &vec_timeout);
 968
 969           if (reass)
 970             {
 971               ip6_reass_update (vm, node, rm, rt, reass, &bi0, &next0,
 972                                 &error0, frag_hdr, &vec_drop_overlap,
 973                                 &vec_drop_compress, is_feature);
 974             }
 975           else
 976             {
 977               next0 = IP6_REASSEMBLY_NEXT_DROP;
 978               error0 = IP6_ERROR_REASS_LIMIT_REACHED;
 979             }
 980
 981           b0->error = node->errors[error0];
 982
 983           if (~0 != bi0)
 984             {
 985             skip_reass:
 986               to_next[0] = bi0;
 987               to_next += 1;
 988               n_left_to_next -= 1;
 989               if (is_feature && IP6_ERROR_NONE == error0)
 990                 {
 991                   vnet_feature_next (vnet_buffer (b0)->sw_if_index[VLIB_RX],
 992                                      &next0, b0);
 993                 }
 994               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 995                                                n_left_to_next, bi0, next0);
 996             }
 997
 998           if (~0 != icmp_bi)
 999             {
1000               next0 = IP6_REASSEMBLY_NEXT_ICMP_ERROR;
1001               to_next[0] = icmp_bi;
1002               to_next += 1;
1003               n_left_to_next -= 1;
1004               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1005                                                n_left_to_next, icmp_bi,
1006                                                next0);
1007             }
1008           from += 1;
1009           n_left_from -= 1;
1010         }
1011
1012       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1013     }
1014
1015   clib_spinlock_unlock (&rt->lock);
1016   return frame->n_vectors;
1017 }
1018
1019 static char *ip6_reassembly_error_strings[] = {
1020 #define _(sym, string) string,
1021   foreach_ip6_error
1022 #undef _
1023 };
1024
1025 always_inline uword
1026 ip6_reassembly (vlib_main_t * vm, vlib_node_runtime_t * node,
1027                 vlib_frame_t * frame)
1028 {
1029   return ip6_reassembly_inline (vm, node, frame, false /* is_feature */ );
1030 }
1031
1032 /* *INDENT-OFF* */
1033 VLIB_REGISTER_NODE (ip6_reass_node, static) = {
1034     .function = ip6_reassembly,
1035     .name = "ip6-reassembly",
1036     .vector_size = sizeof (u32),
1037     .format_trace = format_ip6_reass_trace,
1038     .n_errors = ARRAY_LEN (ip6_reassembly_error_strings),
1039     .error_strings = ip6_reassembly_error_strings,
1040     .n_next_nodes = IP6_REASSEMBLY_N_NEXT,
1041     .next_nodes =
1042         {
1043                 [IP6_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1044                 [IP6_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1045                 [IP6_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1046         },
1047 };
1048 /* *INDENT-ON* */
1049
1050 VLIB_NODE_FUNCTION_MULTIARCH (ip6_reass_node, ip6_reassembly);
1051
1052 always_inline uword
1053 ip6_reassembly_feature (vlib_main_t * vm,
1054                         vlib_node_runtime_t * node, vlib_frame_t * frame)
1055 {
1056   return ip6_reassembly_inline (vm, node, frame, true /* is_feature */ );
1057 }
1058
1059 /* *INDENT-OFF* */
1060 VLIB_REGISTER_NODE (ip6_reass_node_feature, static) = {
1061     .function = ip6_reassembly_feature,
1062     .name = "ip6-reassembly-feature",
1063     .vector_size = sizeof (u32),
1064     .format_trace = format_ip6_reass_trace,
1065     .n_errors = ARRAY_LEN (ip6_reassembly_error_strings),
1066     .error_strings = ip6_reassembly_error_strings,
1067     .n_next_nodes = IP6_REASSEMBLY_N_NEXT,
1068     .next_nodes =
1069         {
1070                 [IP6_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1071                 [IP6_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1072                 [IP6_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1073         },
1074 };
1075 /* *INDENT-ON* */
1076
1077 VLIB_NODE_FUNCTION_MULTIARCH (ip6_reass_node_feature, ip6_reassembly_feature);
1078
1079 /* *INDENT-OFF* */
1080 VNET_FEATURE_INIT (ip6_reassembly_feature, static) = {
1081     .arc_name = "ip6-unicast",
1082     .node_name = "ip6-reassembly-feature",
1083     .runs_before = VNET_FEATURES ("ip6-lookup"),
1084     .runs_after = 0,
1085 };
1086 /* *INDENT-ON* */
1087
1088 static u32
1089 ip6_reass_get_nbuckets ()
1090 {
1091   ip6_reass_main_t *rm = &ip6_reass_main;
1092   u32 nbuckets;
1093   u8 i;
1094
1095   nbuckets = (u32) (rm->max_reass_n / IP6_REASS_HT_LOAD_FACTOR);
1096
1097   for (i = 0; i < 31; i++)
1098     if ((1 << i) >= nbuckets)
1099       break;
1100   nbuckets = 1 << i;
1101
1102   return nbuckets;
1103 }
1104
1105 typedef enum
1106 {
1107   IP6_EVENT_CONFIG_CHANGED = 1,
1108 } ip6_reass_event_t;
1109
1110 typedef struct
1111 {
1112   int failure;
1113   clib_bihash_48_8_t *new_hash;
1114 } ip6_rehash_cb_ctx;
1115
1116 static void
1117 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
1118 {
1119   ip6_rehash_cb_ctx *ctx = _ctx;
1120   if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
1121     {
1122       ctx->failure = 1;
1123     }
1124 }
1125
1126 static void
1127 ip6_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1128                       u32 expire_walk_interval_ms)
1129 {
1130   ip6_reass_main.timeout_ms = timeout_ms;
1131   ip6_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1132   ip6_reass_main.max_reass_n = max_reassemblies;
1133   ip6_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1134 }
1135
1136 vnet_api_error_t
1137 ip6_reass_set (u32 timeout_ms, u32 max_reassemblies,
1138                u32 expire_walk_interval_ms)
1139 {
1140   u32 old_nbuckets = ip6_reass_get_nbuckets ();
1141   ip6_reass_set_params (timeout_ms, max_reassemblies,
1142                         expire_walk_interval_ms);
1143   vlib_process_signal_event (ip6_reass_main.vlib_main,
1144                              ip6_reass_main.ip6_reass_expire_node_idx,
1145                              IP6_EVENT_CONFIG_CHANGED, 0);
1146   u32 new_nbuckets = ip6_reass_get_nbuckets ();
1147   if (ip6_reass_main.max_reass_n > 0 && new_nbuckets > 1 &&
1148       new_nbuckets != old_nbuckets)
1149     {
1150       clib_bihash_48_8_t new_hash;
1151       memset (&new_hash, 0, sizeof (new_hash));
1152       ip6_rehash_cb_ctx ctx;
1153       ctx.failure = 0;
1154       ctx.new_hash = &new_hash;
1155       clib_bihash_init_48_8 (&new_hash, "ip6-reass", new_nbuckets,
1156                              new_nbuckets * 1024);
1157       clib_bihash_foreach_key_value_pair_48_8 (&ip6_reass_main.hash,
1158                                                ip6_rehash_cb, &ctx);
1159       if (ctx.failure)
1160         {
1161           clib_bihash_free_48_8 (&new_hash);
1162           return -1;
1163         }
1164       else
1165         {
1166           clib_bihash_free_48_8 (&ip6_reass_main.hash);
1167           clib_memcpy (&ip6_reass_main.hash, &new_hash,
1168                        sizeof (ip6_reass_main.hash));
1169         }
1170     }
1171   return 0;
1172 }
1173
1174 vnet_api_error_t
1175 ip6_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1176                u32 * expire_walk_interval_ms)
1177 {
1178   *timeout_ms = ip6_reass_main.timeout_ms;
1179   *max_reassemblies = ip6_reass_main.max_reass_n;
1180   *expire_walk_interval_ms = ip6_reass_main.expire_walk_interval_ms;
1181   return 0;
1182 }
1183
1184 static clib_error_t *
1185 ip6_reass_init_function (vlib_main_t * vm)
1186 {
1187   ip6_reass_main_t *rm = &ip6_reass_main;
1188   clib_error_t *error = 0;
1189   u32 nbuckets;
1190   vlib_node_t *node;
1191
1192   rm->vlib_main = vm;
1193   rm->vnet_main = vnet_get_main ();
1194
1195   vec_validate (rm->per_thread_data, vlib_num_workers () + 1);
1196   ip6_reass_per_thread_t *rt;
1197   vec_foreach (rt, rm->per_thread_data)
1198   {
1199     clib_spinlock_init (&rt->lock);
1200     pool_alloc (rt->pool, rm->max_reass_n);
1201   }
1202
1203   node = vlib_get_node_by_name (vm, (u8 *) "ip6-reassembly-expire-walk");
1204   ASSERT (node);
1205   rm->ip6_reass_expire_node_idx = node->index;
1206
1207   nbuckets = ip6_reass_get_nbuckets ();
1208   clib_bihash_init_48_8 (&rm->hash, "ip6-reass", nbuckets, nbuckets * 1024);
1209
1210   node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
1211   ASSERT (node);
1212   rm->ip6_drop_idx = node->index;
1213   node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
1214   ASSERT (node);
1215   rm->ip6_icmp_error_idx = node->index;
1216
1217   if ((error = vlib_call_init_function (vm, ip_main_init)))
1218     return error;
1219   ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
1220                          ip6_reass_node.index);
1221
1222   ip6_reass_set_params (IP6_REASS_TIMEOUT_DEFAULT_MS,
1223                         IP6_REASS_MAX_REASSEMBLIES_DEFAULT,
1224                         IP6_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1225
1226   return error;
1227 }
1228
1229 VLIB_INIT_FUNCTION (ip6_reass_init_function);
1230
1231 static uword
1232 ip6_reass_walk_expired (vlib_main_t * vm,
1233                         vlib_node_runtime_t * node, vlib_frame_t * f)
1234 {
1235   ip6_reass_main_t *rm = &ip6_reass_main;
1236   uword event_type, *event_data = 0;
1237
1238   while (true)
1239     {
1240       vlib_process_wait_for_event_or_clock (vm,
1241                                             (f64) rm->expire_walk_interval_ms
1242                                             / (f64) MSEC_PER_SEC);
1243       event_type = vlib_process_get_events (vm, &event_data);
1244
1245       switch (event_type)
1246         {
1247         case ~0:                /* no events => timeout */
1248           /* nothing to do here */
1249           break;
1250         case IP6_EVENT_CONFIG_CHANGED:
1251           break;
1252         default:
1253           clib_warning ("BUG: event type 0x%wx", event_type);
1254           break;
1255         }
1256       f64 now = vlib_time_now (vm);
1257
1258       ip6_reass_t *reass;
1259       u32 *vec_timeout = NULL;
1260       int *pool_indexes_to_free = NULL;
1261
1262       uword thread_index = 0;
1263       int index;
1264       const uword nthreads = os_get_nthreads ();
1265       u32 *vec_icmp_bi = NULL;
1266       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1267         {
1268           ip6_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1269           clib_spinlock_lock (&rt->lock);
1270
1271           vec_reset_length (pool_indexes_to_free);
1272           /* *INDENT-OFF* */
1273           pool_foreach_index (index, rt->pool, ({
1274                                 reass = pool_elt_at_index (rt->pool, index);
1275                                 if (now > reass->last_heard + rm->timeout)
1276                                   {
1277                                     vec_add1 (pool_indexes_to_free, index);
1278                                   }
1279                               }));
1280           /* *INDENT-ON* */
1281           int *i;
1282           /* *INDENT-OFF* */
1283           vec_foreach (i, pool_indexes_to_free)
1284           {
1285             ip6_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1286             u32 icmp_bi = ~0;
1287             u32 before = vec_len (vec_timeout);
1288             vlib_buffer_t *b = vlib_get_buffer (vm, reass->first_bi);
1289             if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1290               {
1291                 if (pool_is_free_index (vm->trace_main.trace_buffer_pool,
1292                                         b->trace_index))
1293                   {
1294                     /* the trace is gone, don't trace this buffer anymore */
1295                     b->flags &= ~VLIB_BUFFER_IS_TRACED;
1296                   }
1297               }
1298             ip6_reass_on_timeout (vm, node, rm, reass, &icmp_bi, &vec_timeout);
1299             u32 after = vec_len (vec_timeout);
1300             ASSERT (rt->buffers_n >= (after - before));
1301             rt->buffers_n -= (after - before);
1302             if (~0 != icmp_bi)
1303               {
1304                 vec_add1 (vec_icmp_bi, icmp_bi);
1305                 ASSERT (rt->buffers_n > 0);
1306                 --rt->buffers_n;
1307               }
1308             ip6_reass_free (rm, rt, reass);
1309           }
1310           /* *INDENT-ON* */
1311
1312           clib_spinlock_unlock (&rt->lock);
1313         }
1314
1315       while (vec_len (vec_timeout) > 0)
1316         {
1317           vlib_frame_t *f = vlib_get_frame_to_node (vm, rm->ip6_drop_idx);
1318           u32 *to_next = vlib_frame_vector_args (f);
1319           u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
1320           int trace_frame = 0;
1321           while (vec_len (vec_timeout) > 0 && n_left_to_next > 0)
1322             {
1323               u32 bi = vec_pop (vec_timeout);
1324               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1325               if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1326                 {
1327                   if (pool_is_free_index (vm->trace_main.trace_buffer_pool,
1328                                           b->trace_index))
1329                     {
1330                       /* the trace is gone, don't trace this buffer anymore */
1331                       b->flags &= ~VLIB_BUFFER_IS_TRACED;
1332                     }
1333                   else
1334                     {
1335                       trace_frame = 1;
1336                     }
1337                 }
1338               b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
1339               to_next[0] = bi;
1340               ++f->n_vectors;
1341               to_next += 1;
1342               n_left_to_next -= 1;
1343             }
1344           f->flags |= (trace_frame * VLIB_FRAME_TRACE);
1345           vlib_put_frame_to_node (vm, rm->ip6_drop_idx, f);
1346         }
1347
1348       while (vec_len (vec_icmp_bi) > 0)
1349         {
1350           vlib_frame_t *f =
1351             vlib_get_frame_to_node (vm, rm->ip6_icmp_error_idx);
1352           u32 *to_next = vlib_frame_vector_args (f);
1353           u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
1354           int trace_frame = 0;
1355           while (vec_len (vec_icmp_bi) > 0 && n_left_to_next > 0)
1356             {
1357               u32 bi = vec_pop (vec_icmp_bi);
1358               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1359               if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1360                 {
1361                   if (pool_is_free_index (vm->trace_main.trace_buffer_pool,
1362                                           b->trace_index))
1363                     {
1364                       /* the trace is gone, don't trace this buffer anymore */
1365                       b->flags &= ~VLIB_BUFFER_IS_TRACED;
1366                     }
1367                   else
1368                     {
1369                       trace_frame = 1;
1370                     }
1371                 }
1372               b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
1373               to_next[0] = bi;
1374               ++f->n_vectors;
1375               to_next += 1;
1376               n_left_to_next -= 1;
1377             }
1378           f->flags |= (trace_frame * VLIB_FRAME_TRACE);
1379           vlib_put_frame_to_node (vm, rm->ip6_icmp_error_idx, f);
1380         }
1381
1382       vec_free (pool_indexes_to_free);
1383       vec_free (vec_timeout);
1384       vec_free (vec_icmp_bi);
1385       if (event_data)
1386         {
1387           _vec_len (event_data) = 0;
1388         }
1389     }
1390
1391   return 0;
1392 }
1393
1394 static vlib_node_registration_t ip6_reass_expire_node;
1395
1396 /* *INDENT-OFF* */
1397 VLIB_REGISTER_NODE (ip6_reass_expire_node, static) = {
1398     .function = ip6_reass_walk_expired,
1399     .format_trace = format_ip6_reass_trace,
1400     .type = VLIB_NODE_TYPE_PROCESS,
1401     .name = "ip6-reassembly-expire-walk",
1402
1403     .n_errors = ARRAY_LEN (ip6_reassembly_error_strings),
1404     .error_strings = ip6_reassembly_error_strings,
1405
1406 };
1407 /* *INDENT-ON* */
1408
1409 static u8 *
1410 format_ip6_reass_key (u8 * s, va_list * args)
1411 {
1412   ip6_reass_key_t *key = va_arg (*args, ip6_reass_key_t *);
1413   s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1414               key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1415               &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1416   return s;
1417 }
1418
1419 static u8 *
1420 format_ip6_reass (u8 * s, va_list * args)
1421 {
1422   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1423   ip6_reass_t *reass = va_arg (*args, ip6_reass_t *);
1424
1425   s = format (s, "ID: %lu, key: %U\n  first_bi: %u, data_len: %u, "
1426               "last_packet_octet: %u, trace_op_counter: %u\n",
1427               reass->id, format_ip6_reass_key, &reass->key, reass->first_bi,
1428               reass->data_len, reass->last_packet_octet,
1429               reass->trace_op_counter);
1430   u32 bi = reass->first_bi;
1431   u32 counter = 0;
1432   while (~0 != bi)
1433     {
1434       vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1435       vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1436       s = format (s, "  #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1437                   "fragment[%u, %u]\n",
1438                   counter, vnb->ip.reass.range_first,
1439                   vnb->ip.reass.range_last, bi,
1440                   ip6_reass_buffer_get_data_offset_no_check (b),
1441                   ip6_reass_buffer_get_data_len_no_check (b),
1442                   vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1443       if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1444         {
1445           bi = b->next_buffer;
1446         }
1447       else
1448         {
1449           bi = ~0;
1450         }
1451     }
1452   return s;
1453 }
1454
1455 static clib_error_t *
1456 show_ip6_reass (vlib_main_t * vm, unformat_input_t * input,
1457                 CLIB_UNUSED (vlib_cli_command_t * lmd))
1458 {
1459   ip6_reass_main_t *rm = &ip6_reass_main;
1460
1461   vlib_cli_output (vm, "---------------------");
1462   vlib_cli_output (vm, "IP6 reassembly status");
1463   vlib_cli_output (vm, "---------------------");
1464   bool details = false;
1465   if (unformat (input, "details"))
1466     {
1467       details = true;
1468     }
1469
1470   u32 sum_reass_n = 0;
1471   u64 sum_buffers_n = 0;
1472   ip6_reass_t *reass;
1473   uword thread_index;
1474   const uword nthreads = os_get_nthreads ();
1475   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1476     {
1477       ip6_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1478       clib_spinlock_lock (&rt->lock);
1479       if (details)
1480         {
1481           /* *INDENT-OFF* */
1482           pool_foreach (reass, rt->pool, {
1483             vlib_cli_output (vm, "%U", format_ip6_reass, vm, reass);
1484           });
1485           /* *INDENT-ON* */
1486         }
1487       sum_reass_n += rt->reass_n;
1488       sum_buffers_n += rt->buffers_n;
1489       clib_spinlock_unlock (&rt->lock);
1490     }
1491   vlib_cli_output (vm, "---------------------");
1492   vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1493                    (long unsigned) sum_reass_n);
1494   vlib_cli_output (vm, "Maximum configured concurrent IP6 reassemblies per "
1495                    "worker-thread: %lu\n", (long unsigned) rm->max_reass_n);
1496   vlib_cli_output (vm, "Buffers in use: %lu\n",
1497                    (long unsigned) sum_buffers_n);
1498   return 0;
1499 }
1500
1501 /* *INDENT-OFF* */
1502 VLIB_CLI_COMMAND (show_ip6_reassembly_cmd, static) = {
1503     .path = "show ip6-reassembly",
1504     .short_help = "show ip6-reassembly [details]",
1505     .function = show_ip6_reass,
1506 };
1507 /* *INDENT-ON* */
1508
1509 vnet_api_error_t
1510 ip6_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1511 {
1512   return vnet_feature_enable_disable ("ip6-unicast", "ip6-reassembly-feature",
1513                                       sw_if_index, enable_disable, 0, 0);
1514 }
1515
1516 /*
1517  * fd.io coding-style-patch-verification: ON
1518  *
1519  * Local Variables:
1520  * eval: (c-set-style "gnu")
1521  * End:
1522  */