src/vnet/ip/reass/ip6_sv_reass.c

   1 /*
   2  * Copyright (c) 2017 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 /**
  17  * @file
  18  * @brief IPv6 Shallow Virtual Reassembly.
  19  *
  20  * This file contains the source code for IPv6 Shallow Virtual reassembly.
  21  */
  22
  23 #include <vppinfra/vec.h>
  24 #include <vnet/vnet.h>
  25 #include <vnet/ip/ip.h>
  26 #include <vnet/ip/ip6_to_ip4.h>
  27 #include <vppinfra/bihash_48_8.h>
  28 #include <vnet/ip/reass/ip6_sv_reass.h>
  29 #include <vnet/ip/ip6_inlines.h>
  30
  31 #define MSEC_PER_SEC 1000
  32 #define IP6_SV_REASS_TIMEOUT_DEFAULT_MS 100
  33 #define IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000      // 10 seconds default
  34 #define IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT 1024
  35 #define IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
  36 #define IP6_SV_REASS_HT_LOAD_FACTOR (0.75)
  37
  38 typedef enum
  39 {
  40   IP6_SV_REASS_RC_OK,
  41   IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS,
  42   IP6_SV_REASS_RC_INTERNAL_ERROR,
  43   IP6_SV_REASS_RC_UNSUPP_IP_PROTO,
  44 } ip6_sv_reass_rc_t;
  45
  46 typedef struct
  47 {
  48   union
  49   {
  50     struct
  51     {
  52       ip6_address_t src;
  53       ip6_address_t dst;
  54       u32 fib_index;
  55       u32 frag_id;
  56       u8 unused[7];
  57       u8 proto;
  58     };
  59     u64 as_u64[6];
  60   };
  61 } ip6_sv_reass_key_t;
  62
  63 typedef union
  64 {
  65   struct
  66   {
  67     u32 reass_index;
  68     u32 thread_index;
  69   };
  70   u64 as_u64;
  71 } ip6_sv_reass_val_t;
  72
  73 typedef union
  74 {
  75   struct
  76   {
  77     ip6_sv_reass_key_t k;
  78     ip6_sv_reass_val_t v;
  79   };
  80   clib_bihash_kv_48_8_t kv;
  81 } ip6_sv_reass_kv_t;
  82
  83 typedef struct
  84 {
  85   // hash table key
  86   ip6_sv_reass_key_t key;
  87   // time when last packet was received
  88   f64 last_heard;
  89   // internal id of this reassembly
  90   u64 id;
  91   // trace operation counter
  92   u32 trace_op_counter;
  93   // buffer indexes of buffers in this reassembly in chronological order -
  94   // including overlaps and duplicate fragments
  95   u32 *cached_buffers;
  96   // set to true when this reassembly is completed
  97   bool is_complete;
  98   // ip protocol
  99   u8 ip_proto;
 100   u8 icmp_type_or_tcp_flags;
 101   u32 tcp_ack_number;
 102   u32 tcp_seq_number;
 103   // l4 src port
 104   u16 l4_src_port;
 105   // l4 dst port
 106   u16 l4_dst_port;
 107   // lru indexes
 108   u32 lru_prev;
 109   u32 lru_next;
 110 } ip6_sv_reass_t;
 111
 112 typedef struct
 113 {
 114   ip6_sv_reass_t *pool;
 115   u32 reass_n;
 116   u32 id_counter;
 117   clib_spinlock_t lock;
 118   // lru indexes
 119   u32 lru_first;
 120   u32 lru_last;
 121 } ip6_sv_reass_per_thread_t;
 122
 123 typedef struct
 124 {
 125   // IPv6 config
 126   u32 timeout_ms;
 127   f64 timeout;
 128   u32 expire_walk_interval_ms;
 129   // maximum number of fragments in one reassembly
 130   u32 max_reass_len;
 131   // maximum number of reassemblies
 132   u32 max_reass_n;
 133
 134   // IPv6 runtime
 135   clib_bihash_48_8_t hash;
 136
 137   // per-thread data
 138   ip6_sv_reass_per_thread_t *per_thread_data;
 139
 140   // convenience
 141   vlib_main_t *vlib_main;
 142   vnet_main_t *vnet_main;
 143
 144   // node index of ip6-drop node
 145   u32 ip6_drop_idx;
 146   u32 ip6_icmp_error_idx;
 147   u32 ip6_sv_reass_expire_node_idx;
 148
 149   /** Worker handoff */
 150   u32 fq_index;
 151   u32 fq_feature_index;
 152
 153   // reference count for enabling/disabling feature - per interface
 154   u32 *feature_use_refcount_per_intf;
 155 } ip6_sv_reass_main_t;
 156
 157 extern ip6_sv_reass_main_t ip6_sv_reass_main;
 158
 159 #ifndef CLIB_MARCH_VARIANT
 160 ip6_sv_reass_main_t ip6_sv_reass_main;
 161 #endif /* CLIB_MARCH_VARIANT */
 162
 163 typedef enum
 164 {
 165   IP6_SV_REASSEMBLY_NEXT_INPUT,
 166   IP6_SV_REASSEMBLY_NEXT_DROP,
 167   IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR,
 168   IP6_SV_REASSEMBLY_NEXT_HANDOFF,
 169   IP6_SV_REASSEMBLY_N_NEXT,
 170 } ip6_sv_reass_next_t;
 171
 172 typedef enum
 173 {
 174   REASS_FRAGMENT_CACHE,
 175   REASS_FINISH,
 176   REASS_FRAGMENT_FORWARD,
 177   REASS_PASSTHROUGH,
 178 } ip6_sv_reass_trace_operation_e;
 179
 180 typedef struct
 181 {
 182   ip6_sv_reass_trace_operation_e action;
 183   u32 reass_id;
 184   u32 op_id;
 185   u8 ip_proto;
 186   u16 l4_src_port;
 187   u16 l4_dst_port;
 188 } ip6_sv_reass_trace_t;
 189
 190 static u8 *
 191 format_ip6_sv_reass_trace (u8 * s, va_list * args)
 192 {
 193   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 194   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 195   ip6_sv_reass_trace_t *t = va_arg (*args, ip6_sv_reass_trace_t *);
 196   if (REASS_PASSTHROUGH != t->action)
 197     {
 198       s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
 199     }
 200   switch (t->action)
 201     {
 202     case REASS_FRAGMENT_CACHE:
 203       s = format (s, "[cached]");
 204       break;
 205     case REASS_FINISH:
 206       s =
 207         format (s, "[finish, ip proto=%u, src_port=%u, dst_port=%u]",
 208                 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
 209                 clib_net_to_host_u16 (t->l4_dst_port));
 210       break;
 211     case REASS_FRAGMENT_FORWARD:
 212       s =
 213         format (s, "[forward, ip proto=%u, src_port=%u, dst_port=%u]",
 214                 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
 215                 clib_net_to_host_u16 (t->l4_dst_port));
 216       break;
 217     case REASS_PASSTHROUGH:
 218       s = format (s, "[not fragmented or atomic fragment]");
 219       break;
 220     }
 221   return s;
 222 }
 223
 224 static void
 225 ip6_sv_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 226                         ip6_sv_reass_t * reass, u32 bi,
 227                         ip6_sv_reass_trace_operation_e action,
 228                         u32 ip_proto, u16 l4_src_port, u16 l4_dst_port)
 229 {
 230   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 231   if (pool_is_free_index
 232       (vm->trace_main.trace_buffer_pool, vlib_buffer_get_trace_index (b)))
 233     {
 234       // this buffer's trace is gone
 235       b->flags &= ~VLIB_BUFFER_IS_TRACED;
 236       return;
 237     }
 238   ip6_sv_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 239   if (reass)
 240     {
 241       t->reass_id = reass->id;
 242       t->op_id = reass->trace_op_counter;
 243       ++reass->trace_op_counter;
 244     }
 245   t->action = action;
 246   t->ip_proto = ip_proto;
 247   t->l4_src_port = l4_src_port;
 248   t->l4_dst_port = l4_dst_port;
 249 #if 0
 250   static u8 *s = NULL;
 251   s = format (s, "%U", format_ip6_sv_reass_trace, NULL, NULL, t);
 252   printf ("%.*s\n", vec_len (s), s);
 253   fflush (stdout);
 254   vec_reset_length (s);
 255 #endif
 256 }
 257
 258 always_inline void
 259 ip6_sv_reass_free (vlib_main_t * vm, ip6_sv_reass_main_t * rm,
 260                    ip6_sv_reass_per_thread_t * rt, ip6_sv_reass_t * reass)
 261 {
 262   clib_bihash_kv_48_8_t kv;
 263   kv.key[0] = reass->key.as_u64[0];
 264   kv.key[1] = reass->key.as_u64[1];
 265   kv.key[2] = reass->key.as_u64[2];
 266   kv.key[3] = reass->key.as_u64[3];
 267   kv.key[4] = reass->key.as_u64[4];
 268   kv.key[5] = reass->key.as_u64[5];
 269   clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
 270   vlib_buffer_free (vm, reass->cached_buffers,
 271                     vec_len (reass->cached_buffers));
 272   vec_free (reass->cached_buffers);
 273   reass->cached_buffers = NULL;
 274   if (~0 != reass->lru_prev)
 275     {
 276       ip6_sv_reass_t *lru_prev =
 277         pool_elt_at_index (rt->pool, reass->lru_prev);
 278       lru_prev->lru_next = reass->lru_next;
 279     }
 280   if (~0 != reass->lru_next)
 281     {
 282       ip6_sv_reass_t *lru_next =
 283         pool_elt_at_index (rt->pool, reass->lru_next);
 284       lru_next->lru_prev = reass->lru_prev;
 285     }
 286   if (rt->lru_first == reass - rt->pool)
 287     {
 288       rt->lru_first = reass->lru_next;
 289     }
 290   if (rt->lru_last == reass - rt->pool)
 291     {
 292       rt->lru_last = reass->lru_prev;
 293     }
 294   pool_put (rt->pool, reass);
 295   --rt->reass_n;
 296 }
 297
 298 always_inline void
 299 ip6_sv_reass_init (ip6_sv_reass_t * reass)
 300 {
 301   reass->cached_buffers = NULL;
 302   reass->is_complete = false;
 303 }
 304
 305 always_inline ip6_sv_reass_t *
 306 ip6_sv_reass_find_or_create (vlib_main_t *vm, ip6_sv_reass_main_t *rm,
 307                              ip6_sv_reass_per_thread_t *rt,
 308                              ip6_sv_reass_kv_t *kv, u8 *do_handoff)
 309 {
 310   ip6_sv_reass_t *reass = NULL;
 311   f64 now = vlib_time_now (vm);
 312
 313   if (!clib_bihash_search_48_8 (&rm->hash, &kv->kv, &kv->kv))
 314     {
 315       if (vm->thread_index != kv->v.thread_index)
 316         {
 317           *do_handoff = 1;
 318           return NULL;
 319         }
 320       reass = pool_elt_at_index (rt->pool, kv->v.reass_index);
 321
 322       if (now > reass->last_heard + rm->timeout)
 323         {
 324           ip6_sv_reass_free (vm, rm, rt, reass);
 325           reass = NULL;
 326         }
 327     }
 328
 329   if (reass)
 330     {
 331       reass->last_heard = now;
 332       return reass;
 333     }
 334
 335   if (rt->reass_n >= rm->max_reass_n)
 336     {
 337       reass = pool_elt_at_index (rt->pool, rt->lru_first);
 338       ip6_sv_reass_free (vm, rm, rt, reass);
 339     }
 340
 341   pool_get (rt->pool, reass);
 342   clib_memset (reass, 0, sizeof (*reass));
 343   reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 344   ++rt->id_counter;
 345   ip6_sv_reass_init (reass);
 346   ++rt->reass_n;
 347
 348   reass->lru_prev = reass->lru_next = ~0;
 349
 350   if (~0 != rt->lru_last)
 351     {
 352       ip6_sv_reass_t *lru_last = pool_elt_at_index (rt->pool, rt->lru_last);
 353       reass->lru_prev = rt->lru_last;
 354       lru_last->lru_next = rt->lru_last = reass - rt->pool;
 355     }
 356
 357   if (~0 == rt->lru_first)
 358     {
 359       rt->lru_first = rt->lru_last = reass - rt->pool;
 360     }
 361
 362   reass->key.as_u64[0] = kv->kv.key[0];
 363   reass->key.as_u64[1] = kv->kv.key[1];
 364   reass->key.as_u64[2] = kv->kv.key[2];
 365   reass->key.as_u64[3] = kv->kv.key[3];
 366   reass->key.as_u64[4] = kv->kv.key[4];
 367   reass->key.as_u64[5] = kv->kv.key[5];
 368   kv->v.reass_index = (reass - rt->pool);
 369   kv->v.thread_index = vm->thread_index;
 370   reass->last_heard = now;
 371
 372   if (clib_bihash_add_del_48_8 (&rm->hash, &kv->kv, 1))
 373     {
 374       ip6_sv_reass_free (vm, rm, rt, reass);
 375       reass = NULL;
 376     }
 377
 378   return reass;
 379 }
 380
 381 always_inline ip6_sv_reass_rc_t
 382 ip6_sv_reass_update (vlib_main_t *vm, vlib_node_runtime_t *node,
 383                      ip6_sv_reass_main_t *rm, ip6_sv_reass_t *reass, u32 bi0,
 384                      ip6_frag_hdr_t *frag_hdr)
 385 {
 386   vlib_buffer_t *fb = vlib_get_buffer (vm, bi0);
 387   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 388   fvnb->ip.reass.ip6_frag_hdr_offset =
 389     (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
 390   ip6_header_t *fip = vlib_buffer_get_current (fb);
 391   if (fb->current_length < sizeof (*fip) ||
 392       fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
 393       fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
 394     {
 395       return IP6_SV_REASS_RC_INTERNAL_ERROR;
 396     }
 397
 398   u32 fragment_first = fvnb->ip.reass.fragment_first =
 399     ip6_frag_hdr_offset_bytes (frag_hdr);
 400   u32 fragment_length =
 401     vlib_buffer_length_in_chain (vm, fb) -
 402     (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 403   u32 fragment_last = fvnb->ip.reass.fragment_last =
 404     fragment_first + fragment_length - 1;
 405   fvnb->ip.reass.range_first = fragment_first;
 406   fvnb->ip.reass.range_last = fragment_last;
 407   fvnb->ip.reass.next_range_bi = ~0;
 408   if (0 == fragment_first)
 409     {
 410       if (!ip6_get_port
 411           (vm, fb, fip, fb->current_length, &reass->ip_proto,
 412            &reass->l4_src_port, &reass->l4_dst_port,
 413            &reass->icmp_type_or_tcp_flags, &reass->tcp_ack_number,
 414            &reass->tcp_seq_number))
 415         return IP6_SV_REASS_RC_UNSUPP_IP_PROTO;
 416
 417       reass->is_complete = true;
 418       vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
 419       if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 420         {
 421           ip6_sv_reass_add_trace (vm, node, reass, bi0, REASS_FINISH,
 422                                   reass->ip_proto, reass->l4_src_port,
 423                                   reass->l4_dst_port);
 424         }
 425     }
 426   vec_add1 (reass->cached_buffers, bi0);
 427   if (!reass->is_complete)
 428     {
 429       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 430         {
 431           ip6_sv_reass_add_trace (vm, node, reass, bi0, REASS_FRAGMENT_CACHE,
 432                                   reass->ip_proto, reass->l4_src_port,
 433                                   reass->l4_dst_port);
 434         }
 435       if (vec_len (reass->cached_buffers) > rm->max_reass_len)
 436         {
 437           return IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS;
 438         }
 439     }
 440   return IP6_SV_REASS_RC_OK;
 441 }
 442
 443 always_inline bool
 444 ip6_sv_reass_verify_upper_layer_present (vlib_node_runtime_t *node,
 445                                          vlib_buffer_t *b,
 446                                          ip6_ext_hdr_chain_t *hc)
 447 {
 448   int nh = hc->eh[hc->length - 1].protocol;
 449   /* Checking to see if it's a terminating header */
 450   if (ip6_ext_hdr (nh))
 451     {
 452       icmp6_error_set_vnet_buffer (
 453         b, ICMP6_parameter_problem,
 454         ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain, 0);
 455       b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
 456       return false;
 457     }
 458   return true;
 459 }
 460
 461 always_inline bool
 462 ip6_sv_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
 463                                          vlib_buffer_t * b,
 464                                          ip6_frag_hdr_t * frag_hdr)
 465 {
 466   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 467   ip6_header_t *ip = vlib_buffer_get_current (b);
 468   int more_fragments = ip6_frag_hdr_more (frag_hdr);
 469   u32 fragment_length =
 470     vlib_buffer_length_in_chain (vm, b) -
 471     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 472   if (more_fragments && 0 != fragment_length % 8)
 473     {
 474       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 475                                    ICMP6_parameter_problem_erroneous_header_field,
 476                                    (u8 *) & ip->payload_length - (u8 *) ip);
 477       return false;
 478     }
 479   return true;
 480 }
 481
 482 always_inline bool
 483 ip6_sv_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
 484                                         vlib_buffer_t * b,
 485                                         ip6_frag_hdr_t * frag_hdr)
 486 {
 487   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 488   u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
 489   u32 fragment_length =
 490     vlib_buffer_length_in_chain (vm, b) -
 491     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 492   if (fragment_first + fragment_length > 65535)
 493     {
 494       ip6_header_t *ip0 = vlib_buffer_get_current (b);
 495       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 496                                    ICMP6_parameter_problem_erroneous_header_field,
 497                                    (u8 *) & frag_hdr->fragment_offset_and_more
 498                                    - (u8 *) ip0);
 499       return false;
 500     }
 501   return true;
 502 }
 503
 504 always_inline uword
 505 ip6_sv_reassembly_inline (vlib_main_t * vm,
 506                           vlib_node_runtime_t * node,
 507                           vlib_frame_t * frame, bool is_feature)
 508 {
 509   u32 *from = vlib_frame_vector_args (frame);
 510   u32 n_left_from, n_left_to_next, *to_next, next_index;
 511   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 512   ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
 513   clib_spinlock_lock (&rt->lock);
 514
 515   n_left_from = frame->n_vectors;
 516   next_index = node->cached_next_index;
 517
 518   while (n_left_from > 0)
 519     {
 520       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 521
 522       while (n_left_from > 0 && n_left_to_next > 0)
 523         {
 524           u32 bi0;
 525           vlib_buffer_t *b0;
 526           u32 next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 527           u32 error0 = IP6_ERROR_NONE;
 528
 529           bi0 = from[0];
 530           b0 = vlib_get_buffer (vm, bi0);
 531
 532           ip6_header_t *ip0 = vlib_buffer_get_current (b0);
 533           ip6_frag_hdr_t *frag_hdr;
 534           ip6_ext_hdr_chain_t hdr_chain;
 535           bool is_atomic_fragment = false;
 536
 537           int res = ip6_ext_header_walk (
 538             b0, ip0, IP_PROTOCOL_IPV6_FRAGMENTATION, &hdr_chain);
 539           if (res >= 0 &&
 540               hdr_chain.eh[res].protocol == IP_PROTOCOL_IPV6_FRAGMENTATION)
 541             {
 542               frag_hdr =
 543                 ip6_ext_next_header_offset (ip0, hdr_chain.eh[res].offset);
 544               is_atomic_fragment = (0 == ip6_frag_hdr_offset (frag_hdr) &&
 545                                     !ip6_frag_hdr_more (frag_hdr));
 546             }
 547
 548           if (res < 0 ||
 549               hdr_chain.eh[res].protocol != IP_PROTOCOL_IPV6_FRAGMENTATION ||
 550               is_atomic_fragment)
 551             {
 552               // this is a regular unfragmented packet or an atomic fragment
 553               if (!ip6_get_port
 554                   (vm, b0, ip0, b0->current_length,
 555                    &(vnet_buffer (b0)->ip.reass.ip_proto),
 556                    &(vnet_buffer (b0)->ip.reass.l4_src_port),
 557                    &(vnet_buffer (b0)->ip.reass.l4_dst_port),
 558                    &(vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags),
 559                    &(vnet_buffer (b0)->ip.reass.tcp_ack_number),
 560                    &(vnet_buffer (b0)->ip.reass.tcp_seq_number)))
 561                 {
 562                   error0 = IP6_ERROR_REASS_UNSUPP_IP_PROTO;
 563                   b0->error = node->errors[error0];
 564                   next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 565                   goto packet_enqueue;
 566                 }
 567               vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
 568               next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
 569               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 570                 {
 571                   ip6_sv_reass_add_trace (
 572                     vm, node, NULL, bi0, REASS_PASSTHROUGH,
 573                     vnet_buffer (b0)->ip.reass.ip_proto,
 574                     vnet_buffer (b0)->ip.reass.l4_src_port,
 575                     vnet_buffer (b0)->ip.reass.l4_dst_port);
 576                 }
 577               goto packet_enqueue;
 578             }
 579
 580           vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
 581             hdr_chain.eh[res].offset;
 582
 583           if (0 == ip6_frag_hdr_offset (frag_hdr))
 584             {
 585               // first fragment - verify upper-layer is present
 586               if (!ip6_sv_reass_verify_upper_layer_present (node, b0,
 587                                                             &hdr_chain))
 588                 {
 589                   next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 590                   goto packet_enqueue;
 591                 }
 592             }
 593           if (!ip6_sv_reass_verify_fragment_multiple_8 (vm, b0, frag_hdr) ||
 594               !ip6_sv_reass_verify_packet_size_lt_64k (vm, b0, frag_hdr))
 595             {
 596               next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 597               goto packet_enqueue;
 598             }
 599
 600           ip6_sv_reass_kv_t kv;
 601           u8 do_handoff = 0;
 602
 603           kv.k.as_u64[0] = ip0->src_address.as_u64[0];
 604           kv.k.as_u64[1] = ip0->src_address.as_u64[1];
 605           kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
 606           kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
 607           kv.k.as_u64[4] =
 608             ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
 609                             vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
 610             (u64) frag_hdr->identification;
 611           kv.k.as_u64[5] = ip0->protocol;
 612
 613           ip6_sv_reass_t *reass =
 614             ip6_sv_reass_find_or_create (vm, rm, rt, &kv, &do_handoff);
 615
 616           if (PREDICT_FALSE (do_handoff))
 617             {
 618               next0 = IP6_SV_REASSEMBLY_NEXT_HANDOFF;
 619               vnet_buffer (b0)->ip.reass.owner_thread_index =
 620                 kv.v.thread_index;
 621               goto packet_enqueue;
 622             }
 623
 624           if (!reass)
 625             {
 626               next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 627               error0 = IP6_ERROR_REASS_LIMIT_REACHED;
 628               b0->error = node->errors[error0];
 629               goto packet_enqueue;
 630             }
 631
 632           if (reass->is_complete)
 633             {
 634               vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 635                 ! !ip6_frag_hdr_offset (frag_hdr);
 636               vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 637               vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 638                 reass->icmp_type_or_tcp_flags;
 639               vnet_buffer (b0)->ip.reass.tcp_ack_number =
 640                 reass->tcp_ack_number;
 641               vnet_buffer (b0)->ip.reass.tcp_seq_number =
 642                 reass->tcp_seq_number;
 643               vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 644               vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 645               next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
 646               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 647                 {
 648                   ip6_sv_reass_add_trace (
 649                     vm, node, reass, bi0, REASS_FRAGMENT_FORWARD,
 650                     reass->ip_proto, reass->l4_src_port, reass->l4_dst_port);
 651                 }
 652               goto packet_enqueue;
 653             }
 654
 655           u32 counter = ~0;
 656           switch (ip6_sv_reass_update (vm, node, rm, reass, bi0, frag_hdr))
 657             {
 658             case IP6_SV_REASS_RC_OK:
 659               /* nothing to do here */
 660               break;
 661             case IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS:
 662               counter = IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG;
 663               break;
 664             case IP6_SV_REASS_RC_UNSUPP_IP_PROTO:
 665               counter = IP6_ERROR_REASS_UNSUPP_IP_PROTO;
 666               break;
 667             case IP6_SV_REASS_RC_INTERNAL_ERROR:
 668               counter = IP6_ERROR_REASS_INTERNAL_ERROR;
 669               break;
 670             }
 671           if (~0 != counter)
 672             {
 673               vlib_node_increment_counter (vm, node->node_index, counter, 1);
 674               ip6_sv_reass_free (vm, rm, rt, reass);
 675               goto next_packet;
 676             }
 677
 678           if (reass->is_complete)
 679             {
 680               u32 idx;
 681               vec_foreach_index (idx, reass->cached_buffers)
 682               {
 683                 u32 bi0 = vec_elt (reass->cached_buffers, idx);
 684                 if (0 == n_left_to_next)
 685                   {
 686                     vlib_put_next_frame (vm, node, next_index,
 687                                          n_left_to_next);
 688                     vlib_get_next_frame (vm, node, next_index, to_next,
 689                                          n_left_to_next);
 690                   }
 691                 to_next[0] = bi0;
 692                 to_next += 1;
 693                 n_left_to_next -= 1;
 694                 b0 = vlib_get_buffer (vm, bi0);
 695                 if (is_feature)
 696                   {
 697                     vnet_feature_next (&next0, b0);
 698                   }
 699                 frag_hdr =
 700                   vlib_buffer_get_current (b0) +
 701                   vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset;
 702                 vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 703                   ! !ip6_frag_hdr_offset (frag_hdr);
 704                 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 705                 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 706                   reass->icmp_type_or_tcp_flags;
 707                 vnet_buffer (b0)->ip.reass.tcp_ack_number =
 708                   reass->tcp_ack_number;
 709                 vnet_buffer (b0)->ip.reass.tcp_seq_number =
 710                   reass->tcp_seq_number;
 711                 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 712                 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 713                 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 714                   {
 715                     ip6_sv_reass_add_trace (
 716                       vm, node, reass, bi0, REASS_FRAGMENT_FORWARD,
 717                       reass->ip_proto, reass->l4_src_port, reass->l4_dst_port);
 718                   }
 719                 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 720                                                  to_next, n_left_to_next, bi0,
 721                                                  next0);
 722               }
 723               _vec_len (reass->cached_buffers) = 0;     // buffers are owned by frame now
 724             }
 725           goto next_packet;
 726
 727         packet_enqueue:
 728           to_next[0] = bi0;
 729           to_next += 1;
 730           n_left_to_next -= 1;
 731           if (is_feature && IP6_ERROR_NONE == error0)
 732             {
 733               b0 = vlib_get_buffer (vm, bi0);
 734               vnet_feature_next (&next0, b0);
 735             }
 736           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 737                                            n_left_to_next, bi0, next0);
 738
 739         next_packet:
 740           from += 1;
 741           n_left_from -= 1;
 742         }
 743
 744       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 745     }
 746
 747   clib_spinlock_unlock (&rt->lock);
 748   return frame->n_vectors;
 749 }
 750
 751 static char *ip6_sv_reassembly_error_strings[] = {
 752 #define _(sym, string) string,
 753   foreach_ip6_error
 754 #undef _
 755 };
 756
 757 VLIB_NODE_FN (ip6_sv_reass_node) (vlib_main_t * vm,
 758                                   vlib_node_runtime_t * node,
 759                                   vlib_frame_t * frame)
 760 {
 761   return ip6_sv_reassembly_inline (vm, node, frame, false /* is_feature */ );
 762 }
 763
 764 /* *INDENT-OFF* */
 765 VLIB_REGISTER_NODE (ip6_sv_reass_node) = {
 766     .name = "ip6-sv-reassembly",
 767     .vector_size = sizeof (u32),
 768     .format_trace = format_ip6_sv_reass_trace,
 769     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
 770     .error_strings = ip6_sv_reassembly_error_strings,
 771     .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
 772     .next_nodes =
 773         {
 774                 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
 775                 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
 776                 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
 777                 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reassembly-handoff",
 778         },
 779 };
 780 /* *INDENT-ON* */
 781
 782 VLIB_NODE_FN (ip6_sv_reass_node_feature) (vlib_main_t * vm,
 783                                           vlib_node_runtime_t * node,
 784                                           vlib_frame_t * frame)
 785 {
 786   return ip6_sv_reassembly_inline (vm, node, frame, true /* is_feature */ );
 787 }
 788
 789 /* *INDENT-OFF* */
 790 VLIB_REGISTER_NODE (ip6_sv_reass_node_feature) = {
 791     .name = "ip6-sv-reassembly-feature",
 792     .vector_size = sizeof (u32),
 793     .format_trace = format_ip6_sv_reass_trace,
 794     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
 795     .error_strings = ip6_sv_reassembly_error_strings,
 796     .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
 797     .next_nodes =
 798         {
 799                 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
 800                 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
 801                 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
 802                 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reass-feature-hoff",
 803         },
 804 };
 805 /* *INDENT-ON* */
 806
 807 /* *INDENT-OFF* */
 808 VNET_FEATURE_INIT (ip6_sv_reassembly_feature) = {
 809     .arc_name = "ip6-unicast",
 810     .node_name = "ip6-sv-reassembly-feature",
 811     .runs_before = VNET_FEATURES ("ip6-lookup"),
 812     .runs_after = 0,
 813 };
 814 /* *INDENT-ON* */
 815
 816 #ifndef CLIB_MARCH_VARIANT
 817 static u32
 818 ip6_sv_reass_get_nbuckets ()
 819 {
 820   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 821   u32 nbuckets;
 822   u8 i;
 823
 824   nbuckets = (u32) (rm->max_reass_n / IP6_SV_REASS_HT_LOAD_FACTOR);
 825
 826   for (i = 0; i < 31; i++)
 827     if ((1 << i) >= nbuckets)
 828       break;
 829   nbuckets = 1 << i;
 830
 831   return nbuckets;
 832 }
 833 #endif /* CLIB_MARCH_VARIANT */
 834
 835 typedef enum
 836 {
 837   IP6_EVENT_CONFIG_CHANGED = 1,
 838 } ip6_sv_reass_event_t;
 839
 840 #ifndef CLIB_MARCH_VARIANT
 841 typedef struct
 842 {
 843   int failure;
 844   clib_bihash_48_8_t *new_hash;
 845 } ip6_rehash_cb_ctx;
 846
 847 static int
 848 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
 849 {
 850   ip6_rehash_cb_ctx *ctx = _ctx;
 851   if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
 852     {
 853       ctx->failure = 1;
 854     }
 855   return (BIHASH_WALK_CONTINUE);
 856 }
 857
 858 static void
 859 ip6_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
 860                          u32 max_reassembly_length,
 861                          u32 expire_walk_interval_ms)
 862 {
 863   ip6_sv_reass_main.timeout_ms = timeout_ms;
 864   ip6_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
 865   ip6_sv_reass_main.max_reass_n = max_reassemblies;
 866   ip6_sv_reass_main.max_reass_len = max_reassembly_length;
 867   ip6_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
 868 }
 869
 870 vnet_api_error_t
 871 ip6_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
 872                   u32 max_reassembly_length, u32 expire_walk_interval_ms)
 873 {
 874   u32 old_nbuckets = ip6_sv_reass_get_nbuckets ();
 875   ip6_sv_reass_set_params (timeout_ms, max_reassemblies,
 876                            max_reassembly_length, expire_walk_interval_ms);
 877   vlib_process_signal_event (ip6_sv_reass_main.vlib_main,
 878                              ip6_sv_reass_main.ip6_sv_reass_expire_node_idx,
 879                              IP6_EVENT_CONFIG_CHANGED, 0);
 880   u32 new_nbuckets = ip6_sv_reass_get_nbuckets ();
 881   if (ip6_sv_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
 882     {
 883       clib_bihash_48_8_t new_hash;
 884       clib_memset (&new_hash, 0, sizeof (new_hash));
 885       ip6_rehash_cb_ctx ctx;
 886       ctx.failure = 0;
 887       ctx.new_hash = &new_hash;
 888       clib_bihash_init_48_8 (&new_hash, "ip6-sv-reass", new_nbuckets,
 889                              new_nbuckets * 1024);
 890       clib_bihash_foreach_key_value_pair_48_8 (&ip6_sv_reass_main.hash,
 891                                                ip6_rehash_cb, &ctx);
 892       if (ctx.failure)
 893         {
 894           clib_bihash_free_48_8 (&new_hash);
 895           return -1;
 896         }
 897       else
 898         {
 899           clib_bihash_free_48_8 (&ip6_sv_reass_main.hash);
 900           clib_memcpy_fast (&ip6_sv_reass_main.hash, &new_hash,
 901                             sizeof (ip6_sv_reass_main.hash));
 902           clib_bihash_copied (&ip6_sv_reass_main.hash, &new_hash);
 903         }
 904     }
 905   return 0;
 906 }
 907
 908 vnet_api_error_t
 909 ip6_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
 910                   u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
 911 {
 912   *timeout_ms = ip6_sv_reass_main.timeout_ms;
 913   *max_reassemblies = ip6_sv_reass_main.max_reass_n;
 914   *max_reassembly_length = ip6_sv_reass_main.max_reass_len;
 915   *expire_walk_interval_ms = ip6_sv_reass_main.expire_walk_interval_ms;
 916   return 0;
 917 }
 918
 919 static clib_error_t *
 920 ip6_sv_reass_init_function (vlib_main_t * vm)
 921 {
 922   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 923   clib_error_t *error = 0;
 924   u32 nbuckets;
 925   vlib_node_t *node;
 926
 927   rm->vlib_main = vm;
 928   rm->vnet_main = vnet_get_main ();
 929
 930   vec_validate (rm->per_thread_data, vlib_num_workers ());
 931   ip6_sv_reass_per_thread_t *rt;
 932   vec_foreach (rt, rm->per_thread_data)
 933   {
 934     clib_spinlock_init (&rt->lock);
 935     pool_alloc (rt->pool, rm->max_reass_n);
 936     rt->lru_first = rt->lru_last = ~0;
 937   }
 938
 939   node = vlib_get_node_by_name (vm, (u8 *) "ip6-sv-reassembly-expire-walk");
 940   ASSERT (node);
 941   rm->ip6_sv_reass_expire_node_idx = node->index;
 942
 943   ip6_sv_reass_set_params (IP6_SV_REASS_TIMEOUT_DEFAULT_MS,
 944                            IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
 945                            IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
 946                            IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
 947
 948   nbuckets = ip6_sv_reass_get_nbuckets ();
 949   clib_bihash_init_48_8 (&rm->hash, "ip6-sv-reass", nbuckets,
 950                          nbuckets * 1024);
 951
 952   node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
 953   ASSERT (node);
 954   rm->ip6_drop_idx = node->index;
 955   node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
 956   ASSERT (node);
 957   rm->ip6_icmp_error_idx = node->index;
 958
 959   if ((error = vlib_call_init_function (vm, ip_main_init)))
 960     return error;
 961
 962   rm->fq_index = vlib_frame_queue_main_init (ip6_sv_reass_node.index, 0);
 963   rm->fq_feature_index =
 964     vlib_frame_queue_main_init (ip6_sv_reass_node_feature.index, 0);
 965
 966   rm->feature_use_refcount_per_intf = NULL;
 967
 968   return error;
 969 }
 970
 971 VLIB_INIT_FUNCTION (ip6_sv_reass_init_function);
 972 #endif /* CLIB_MARCH_VARIANT */
 973
 974 static uword
 975 ip6_sv_reass_walk_expired (vlib_main_t *vm,
 976                            CLIB_UNUSED (vlib_node_runtime_t *node),
 977                            CLIB_UNUSED (vlib_frame_t *f))
 978 {
 979   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 980   uword event_type, *event_data = 0;
 981
 982   while (true)
 983     {
 984       vlib_process_wait_for_event_or_clock (vm,
 985                                             (f64) rm->expire_walk_interval_ms
 986                                             / (f64) MSEC_PER_SEC);
 987       event_type = vlib_process_get_events (vm, &event_data);
 988
 989       switch (event_type)
 990         {
 991         case ~0:
 992           /* no events => timeout */
 993           /* fallthrough */
 994         case IP6_EVENT_CONFIG_CHANGED:
 995           /* nothing to do here */
 996           break;
 997         default:
 998           clib_warning ("BUG: event type 0x%wx", event_type);
 999           break;
1000         }
1001       f64 now = vlib_time_now (vm);
1002
1003       ip6_sv_reass_t *reass;
1004       int *pool_indexes_to_free = NULL;
1005
1006       uword thread_index = 0;
1007       int index;
1008       const uword nthreads = vlib_num_workers () + 1;
1009       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1010         {
1011           ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1012           clib_spinlock_lock (&rt->lock);
1013
1014           vec_reset_length (pool_indexes_to_free);
1015           /* *INDENT-OFF* */
1016           pool_foreach_index (index, rt->pool)  {
1017                                 reass = pool_elt_at_index (rt->pool, index);
1018                                 if (now > reass->last_heard + rm->timeout)
1019                                   {
1020                                     vec_add1 (pool_indexes_to_free, index);
1021                                   }
1022                               }
1023           /* *INDENT-ON* */
1024           int *i;
1025           /* *INDENT-OFF* */
1026           vec_foreach (i, pool_indexes_to_free)
1027           {
1028             ip6_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1029             ip6_sv_reass_free (vm, rm, rt, reass);
1030           }
1031           /* *INDENT-ON* */
1032
1033           clib_spinlock_unlock (&rt->lock);
1034         }
1035
1036       vec_free (pool_indexes_to_free);
1037       if (event_data)
1038         {
1039           _vec_len (event_data) = 0;
1040         }
1041     }
1042
1043   return 0;
1044 }
1045
1046 /* *INDENT-OFF* */
1047 VLIB_REGISTER_NODE (ip6_sv_reass_expire_node) = {
1048     .function = ip6_sv_reass_walk_expired,
1049     .format_trace = format_ip6_sv_reass_trace,
1050     .type = VLIB_NODE_TYPE_PROCESS,
1051     .name = "ip6-sv-reassembly-expire-walk",
1052
1053     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
1054     .error_strings = ip6_sv_reassembly_error_strings,
1055
1056 };
1057 /* *INDENT-ON* */
1058
1059 static u8 *
1060 format_ip6_sv_reass_key (u8 * s, va_list * args)
1061 {
1062   ip6_sv_reass_key_t *key = va_arg (*args, ip6_sv_reass_key_t *);
1063   s =
1064     format (s, "fib_index: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1065             key->fib_index, format_ip6_address, &key->src, format_ip6_address,
1066             &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1067   return s;
1068 }
1069
1070 static u8 *
1071 format_ip6_sv_reass (u8 * s, va_list * args)
1072 {
1073   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1074   ip6_sv_reass_t *reass = va_arg (*args, ip6_sv_reass_t *);
1075
1076   s = format (s, "ID: %lu, key: %U, trace_op_counter: %u\n",
1077               reass->id, format_ip6_sv_reass_key, &reass->key,
1078               reass->trace_op_counter);
1079   vlib_buffer_t *b;
1080   u32 *bip;
1081   u32 counter = 0;
1082   vec_foreach (bip, reass->cached_buffers)
1083   {
1084     u32 bi = *bip;
1085     do
1086       {
1087         b = vlib_get_buffer (vm, bi);
1088         s = format (s, "  #%03u: bi: %u\n", counter, bi);
1089         ++counter;
1090         bi = b->next_buffer;
1091       }
1092     while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1093   }
1094   return s;
1095 }
1096
1097 static clib_error_t *
1098 show_ip6_sv_reass (vlib_main_t * vm, unformat_input_t * input,
1099                    CLIB_UNUSED (vlib_cli_command_t * lmd))
1100 {
1101   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1102
1103   vlib_cli_output (vm, "---------------------");
1104   vlib_cli_output (vm, "IP6 reassembly status");
1105   vlib_cli_output (vm, "---------------------");
1106   bool details = false;
1107   if (unformat (input, "details"))
1108     {
1109       details = true;
1110     }
1111
1112   u32 sum_reass_n = 0;
1113   u64 sum_buffers_n = 0;
1114   ip6_sv_reass_t *reass;
1115   uword thread_index;
1116   const uword nthreads = vlib_num_workers () + 1;
1117   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1118     {
1119       ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1120       clib_spinlock_lock (&rt->lock);
1121       if (details)
1122         {
1123           /* *INDENT-OFF* */
1124           pool_foreach (reass, rt->pool) {
1125             vlib_cli_output (vm, "%U", format_ip6_sv_reass, vm, reass);
1126           }
1127           /* *INDENT-ON* */
1128         }
1129       sum_reass_n += rt->reass_n;
1130       clib_spinlock_unlock (&rt->lock);
1131     }
1132   vlib_cli_output (vm, "---------------------");
1133   vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1134                    (long unsigned) sum_reass_n);
1135   vlib_cli_output (vm,
1136                    "Maximum configured concurrent shallow virtual IP6 reassemblies per worker-thread: %lu\n",
1137                    (long unsigned) rm->max_reass_n);
1138   vlib_cli_output (vm,
1139                    "Maximum configured amount of fragments per shallow "
1140                    "virtual IP6 reassembly: %lu\n",
1141                    (long unsigned) rm->max_reass_len);
1142   vlib_cli_output (vm,
1143                    "Maximum configured shallow virtual IP6 reassembly timeout: %lums\n",
1144                    (long unsigned) rm->timeout_ms);
1145   vlib_cli_output (vm,
1146                    "Maximum configured shallow virtual IP6 reassembly expire walk interval: %lums\n",
1147                    (long unsigned) rm->expire_walk_interval_ms);
1148   vlib_cli_output (vm, "Buffers in use: %lu\n",
1149                    (long unsigned) sum_buffers_n);
1150   return 0;
1151 }
1152
1153 /* *INDENT-OFF* */
1154 VLIB_CLI_COMMAND (show_ip6_sv_reassembly_cmd, static) = {
1155     .path = "show ip6-sv-reassembly",
1156     .short_help = "show ip6-sv-reassembly [details]",
1157     .function = show_ip6_sv_reass,
1158 };
1159 /* *INDENT-ON* */
1160
1161 #ifndef CLIB_MARCH_VARIANT
1162 vnet_api_error_t
1163 ip6_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1164 {
1165   return ip6_sv_reass_enable_disable_with_refcnt (sw_if_index,
1166                                                   enable_disable);
1167 }
1168 #endif /* CLIB_MARCH_VARIANT */
1169
1170 #define foreach_ip6_sv_reassembly_handoff_error                       \
1171 _(CONGESTION_DROP, "congestion drop")
1172
1173
1174 typedef enum
1175 {
1176 #define _(sym,str) IP6_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
1177   foreach_ip6_sv_reassembly_handoff_error
1178 #undef _
1179     IP6_SV_REASSEMBLY_HANDOFF_N_ERROR,
1180 } ip6_sv_reassembly_handoff_error_t;
1181
1182 static char *ip6_sv_reassembly_handoff_error_strings[] = {
1183 #define _(sym,string) string,
1184   foreach_ip6_sv_reassembly_handoff_error
1185 #undef _
1186 };
1187
1188 typedef struct
1189 {
1190   u32 next_worker_index;
1191 } ip6_sv_reassembly_handoff_trace_t;
1192
1193 static u8 *
1194 format_ip6_sv_reassembly_handoff_trace (u8 * s, va_list * args)
1195 {
1196   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1197   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1198   ip6_sv_reassembly_handoff_trace_t *t =
1199     va_arg (*args, ip6_sv_reassembly_handoff_trace_t *);
1200
1201   s =
1202     format (s, "ip6-sv-reassembly-handoff: next-worker %d",
1203             t->next_worker_index);
1204
1205   return s;
1206 }
1207
1208 always_inline uword
1209 ip6_sv_reassembly_handoff_inline (vlib_main_t * vm,
1210                                   vlib_node_runtime_t * node,
1211                                   vlib_frame_t * frame, bool is_feature)
1212 {
1213   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1214
1215   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1216   u32 n_enq, n_left_from, *from;
1217   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1218   u32 fq_index;
1219
1220   from = vlib_frame_vector_args (frame);
1221   n_left_from = frame->n_vectors;
1222   vlib_get_buffers (vm, from, bufs, n_left_from);
1223
1224   b = bufs;
1225   ti = thread_indices;
1226
1227   fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1228
1229   while (n_left_from > 0)
1230     {
1231       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1232
1233       if (PREDICT_FALSE
1234           ((node->flags & VLIB_NODE_FLAG_TRACE)
1235            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1236         {
1237           ip6_sv_reassembly_handoff_trace_t *t =
1238             vlib_add_trace (vm, node, b[0], sizeof (*t));
1239           t->next_worker_index = ti[0];
1240         }
1241
1242       n_left_from -= 1;
1243       ti += 1;
1244       b += 1;
1245     }
1246   n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from,
1247                                          thread_indices, frame->n_vectors, 1);
1248
1249   if (n_enq < frame->n_vectors)
1250     vlib_node_increment_counter (vm, node->node_index,
1251                                  IP6_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1252                                  frame->n_vectors - n_enq);
1253   return frame->n_vectors;
1254 }
1255
1256 VLIB_NODE_FN (ip6_sv_reassembly_handoff_node) (vlib_main_t * vm,
1257                                                vlib_node_runtime_t * node,
1258                                                vlib_frame_t * frame)
1259 {
1260   return ip6_sv_reassembly_handoff_inline (vm, node, frame,
1261                                            false /* is_feature */ );
1262 }
1263
1264 /* *INDENT-OFF* */
1265 VLIB_REGISTER_NODE (ip6_sv_reassembly_handoff_node) = {
1266   .name = "ip6-sv-reassembly-handoff",
1267   .vector_size = sizeof (u32),
1268   .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1269   .error_strings = ip6_sv_reassembly_handoff_error_strings,
1270   .format_trace = format_ip6_sv_reassembly_handoff_trace,
1271
1272   .n_next_nodes = 1,
1273
1274   .next_nodes = {
1275     [0] = "error-drop",
1276   },
1277 };
1278
1279
1280 VLIB_NODE_FN (ip6_sv_reassembly_feature_handoff_node) (vlib_main_t * vm,
1281                                vlib_node_runtime_t * node, vlib_frame_t * frame)
1282 {
1283   return ip6_sv_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1284 }
1285
1286
1287 /* *INDENT-OFF* */
1288 VLIB_REGISTER_NODE (ip6_sv_reassembly_feature_handoff_node) = {
1289   .name = "ip6-sv-reass-feature-hoff",
1290   .vector_size = sizeof (u32),
1291   .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1292   .error_strings = ip6_sv_reassembly_handoff_error_strings,
1293   .format_trace = format_ip6_sv_reassembly_handoff_trace,
1294
1295   .n_next_nodes = 1,
1296
1297   .next_nodes = {
1298     [0] = "error-drop",
1299   },
1300 };
1301 /* *INDENT-ON* */
1302
1303 #ifndef CLIB_MARCH_VARIANT
1304 int
1305 ip6_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1306 {
1307   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1308   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1309   if (is_enable)
1310     {
1311       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1312         {
1313           ++rm->feature_use_refcount_per_intf[sw_if_index];
1314           return vnet_feature_enable_disable ("ip6-unicast",
1315                                               "ip6-sv-reassembly-feature",
1316                                               sw_if_index, 1, 0, 0);
1317         }
1318       ++rm->feature_use_refcount_per_intf[sw_if_index];
1319     }
1320   else
1321     {
1322       --rm->feature_use_refcount_per_intf[sw_if_index];
1323       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1324         return vnet_feature_enable_disable ("ip6-unicast",
1325                                             "ip6-sv-reassembly-feature",
1326                                             sw_if_index, 0, 0, 0);
1327     }
1328   return 0;
1329 }
1330 #endif
1331
1332 /*
1333  * fd.io coding-style-patch-verification: ON
1334  *
1335  * Local Variables:
1336  * eval: (c-set-style "gnu")
1337  * End:
1338  */