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
  30 #define MSEC_PER_SEC 1000
  31 #define IP6_SV_REASS_TIMEOUT_DEFAULT_MS 100
  32 #define IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000      // 10 seconds default
  33 #define IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT 1024
  34 #define IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
  35 #define IP6_SV_REASS_HT_LOAD_FACTOR (0.75)
  36
  37 typedef enum
  38 {
  39   IP6_SV_REASS_RC_OK,
  40   IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS,
  41   IP6_SV_REASS_RC_INTERNAL_ERROR,
  42   IP6_SV_REASS_RC_UNSUPP_IP_PROTO,
  43 } ip6_sv_reass_rc_t;
  44
  45 typedef struct
  46 {
  47   union
  48   {
  49     struct
  50     {
  51       ip6_address_t src;
  52       ip6_address_t dst;
  53       u32 fib_index;
  54       u32 frag_id;
  55       u8 unused[7];
  56       u8 proto;
  57     };
  58     u64 as_u64[6];
  59   };
  60 } ip6_sv_reass_key_t;
  61
  62 typedef union
  63 {
  64   struct
  65   {
  66     u32 reass_index;
  67     u32 thread_index;
  68   };
  69   u64 as_u64;
  70 } ip6_sv_reass_val_t;
  71
  72 typedef union
  73 {
  74   struct
  75   {
  76     ip6_sv_reass_key_t k;
  77     ip6_sv_reass_val_t v;
  78   };
  79   clib_bihash_kv_48_8_t kv;
  80 } ip6_sv_reass_kv_t;
  81
  82 typedef struct
  83 {
  84   // hash table key
  85   ip6_sv_reass_key_t key;
  86   // time when last packet was received
  87   f64 last_heard;
  88   // internal id of this reassembly
  89   u64 id;
  90   // trace operation counter
  91   u32 trace_op_counter;
  92   // buffer indexes of buffers in this reassembly in chronological order -
  93   // including overlaps and duplicate fragments
  94   u32 *cached_buffers;
  95   // set to true when this reassembly is completed
  96   bool is_complete;
  97   // ip protocol
  98   u8 ip_proto;
  99   u8 icmp_type_or_tcp_flags;
 100   u32 tcp_ack_number;
 101   u32 tcp_seq_number;
 102   // l4 src port
 103   u16 l4_src_port;
 104   // l4 dst port
 105   u16 l4_dst_port;
 106   // lru indexes
 107   u32 lru_prev;
 108   u32 lru_next;
 109 } ip6_sv_reass_t;
 110
 111 typedef struct
 112 {
 113   ip6_sv_reass_t *pool;
 114   u32 reass_n;
 115   u32 id_counter;
 116   clib_spinlock_t lock;
 117   // lru indexes
 118   u32 lru_first;
 119   u32 lru_last;
 120 } ip6_sv_reass_per_thread_t;
 121
 122 typedef struct
 123 {
 124   // IPv6 config
 125   u32 timeout_ms;
 126   f64 timeout;
 127   u32 expire_walk_interval_ms;
 128   // maximum number of fragments in one reassembly
 129   u32 max_reass_len;
 130   // maximum number of reassemblies
 131   u32 max_reass_n;
 132
 133   // IPv6 runtime
 134   clib_bihash_48_8_t hash;
 135
 136   // per-thread data
 137   ip6_sv_reass_per_thread_t *per_thread_data;
 138
 139   // convenience
 140   vlib_main_t *vlib_main;
 141   vnet_main_t *vnet_main;
 142
 143   // node index of ip6-drop node
 144   u32 ip6_drop_idx;
 145   u32 ip6_icmp_error_idx;
 146   u32 ip6_sv_reass_expire_node_idx;
 147
 148   /** Worker handoff */
 149   u32 fq_index;
 150   u32 fq_feature_index;
 151
 152   // reference count for enabling/disabling feature - per interface
 153   u32 *feature_use_refcount_per_intf;
 154 } ip6_sv_reass_main_t;
 155
 156 extern ip6_sv_reass_main_t ip6_sv_reass_main;
 157
 158 #ifndef CLIB_MARCH_VARIANT
 159 ip6_sv_reass_main_t ip6_sv_reass_main;
 160 #endif /* CLIB_MARCH_VARIANT */
 161
 162 typedef enum
 163 {
 164   IP6_SV_REASSEMBLY_NEXT_INPUT,
 165   IP6_SV_REASSEMBLY_NEXT_DROP,
 166   IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR,
 167   IP6_SV_REASSEMBLY_NEXT_HANDOFF,
 168   IP6_SV_REASSEMBLY_N_NEXT,
 169 } ip6_sv_reass_next_t;
 170
 171 typedef enum
 172 {
 173   REASS_FRAGMENT_CACHE,
 174   REASS_FINISH,
 175   REASS_FRAGMENT_FORWARD,
 176   REASS_PASSTHROUGH,
 177 } ip6_sv_reass_trace_operation_e;
 178
 179 typedef struct
 180 {
 181   ip6_sv_reass_trace_operation_e action;
 182   u32 reass_id;
 183   u32 op_id;
 184   u8 ip_proto;
 185   u16 l4_src_port;
 186   u16 l4_dst_port;
 187 } ip6_sv_reass_trace_t;
 188
 189 static u8 *
 190 format_ip6_sv_reass_trace (u8 * s, va_list * args)
 191 {
 192   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 193   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 194   ip6_sv_reass_trace_t *t = va_arg (*args, ip6_sv_reass_trace_t *);
 195   if (REASS_PASSTHROUGH != t->action)
 196     {
 197       s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
 198     }
 199   switch (t->action)
 200     {
 201     case REASS_FRAGMENT_CACHE:
 202       s = format (s, "[cached]");
 203       break;
 204     case REASS_FINISH:
 205       s =
 206         format (s, "[finish, ip proto=%u, src_port=%u, dst_port=%u]",
 207                 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
 208                 clib_net_to_host_u16 (t->l4_dst_port));
 209       break;
 210     case REASS_FRAGMENT_FORWARD:
 211       s =
 212         format (s, "[forward, ip proto=%u, src_port=%u, dst_port=%u]",
 213                 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
 214                 clib_net_to_host_u16 (t->l4_dst_port));
 215       break;
 216     case REASS_PASSTHROUGH:
 217       s = format (s, "[not-fragmented]");
 218       break;
 219     }
 220   return s;
 221 }
 222
 223 static void
 224 ip6_sv_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 225                         ip6_sv_reass_t * reass, u32 bi,
 226                         ip6_sv_reass_trace_operation_e action,
 227                         u32 ip_proto, u16 l4_src_port, u16 l4_dst_port)
 228 {
 229   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 230   if (pool_is_free_index
 231       (vm->trace_main.trace_buffer_pool, vlib_buffer_get_trace_index (b)))
 232     {
 233       // this buffer's trace is gone
 234       b->flags &= ~VLIB_BUFFER_IS_TRACED;
 235       return;
 236     }
 237   ip6_sv_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 238   if (reass)
 239     {
 240       t->reass_id = reass->id;
 241       t->op_id = reass->trace_op_counter;
 242       ++reass->trace_op_counter;
 243     }
 244   t->action = action;
 245   t->ip_proto = ip_proto;
 246   t->l4_src_port = l4_src_port;
 247   t->l4_dst_port = l4_dst_port;
 248 #if 0
 249   static u8 *s = NULL;
 250   s = format (s, "%U", format_ip6_sv_reass_trace, NULL, NULL, t);
 251   printf ("%.*s\n", vec_len (s), s);
 252   fflush (stdout);
 253   vec_reset_length (s);
 254 #endif
 255 }
 256
 257 always_inline void
 258 ip6_sv_reass_free (vlib_main_t * vm, ip6_sv_reass_main_t * rm,
 259                    ip6_sv_reass_per_thread_t * rt, ip6_sv_reass_t * reass)
 260 {
 261   clib_bihash_kv_48_8_t kv;
 262   kv.key[0] = reass->key.as_u64[0];
 263   kv.key[1] = reass->key.as_u64[1];
 264   kv.key[2] = reass->key.as_u64[2];
 265   kv.key[3] = reass->key.as_u64[3];
 266   kv.key[4] = reass->key.as_u64[4];
 267   kv.key[5] = reass->key.as_u64[5];
 268   clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
 269   vlib_buffer_free (vm, reass->cached_buffers,
 270                     vec_len (reass->cached_buffers));
 271   vec_free (reass->cached_buffers);
 272   reass->cached_buffers = NULL;
 273   if (~0 != reass->lru_prev)
 274     {
 275       ip6_sv_reass_t *lru_prev =
 276         pool_elt_at_index (rt->pool, reass->lru_prev);
 277       lru_prev->lru_next = reass->lru_next;
 278     }
 279   if (~0 != reass->lru_next)
 280     {
 281       ip6_sv_reass_t *lru_next =
 282         pool_elt_at_index (rt->pool, reass->lru_next);
 283       lru_next->lru_prev = reass->lru_prev;
 284     }
 285   if (rt->lru_first == reass - rt->pool)
 286     {
 287       rt->lru_first = reass->lru_next;
 288     }
 289   if (rt->lru_last == reass - rt->pool)
 290     {
 291       rt->lru_last = reass->lru_prev;
 292     }
 293   pool_put (rt->pool, reass);
 294   --rt->reass_n;
 295 }
 296
 297 always_inline void
 298 ip6_sv_reass_init (ip6_sv_reass_t * reass)
 299 {
 300   reass->cached_buffers = NULL;
 301   reass->is_complete = false;
 302 }
 303
 304 always_inline ip6_sv_reass_t *
 305 ip6_sv_reass_find_or_create (vlib_main_t *vm, ip6_sv_reass_main_t *rm,
 306                              ip6_sv_reass_per_thread_t *rt,
 307                              ip6_sv_reass_kv_t *kv, u8 *do_handoff)
 308 {
 309   ip6_sv_reass_t *reass = NULL;
 310   f64 now = vlib_time_now (vm);
 311
 312   if (!clib_bihash_search_48_8 (&rm->hash, &kv->kv, &kv->kv))
 313     {
 314       if (vm->thread_index != kv->v.thread_index)
 315         {
 316           *do_handoff = 1;
 317           return NULL;
 318         }
 319       reass = pool_elt_at_index (rt->pool, kv->v.reass_index);
 320
 321       if (now > reass->last_heard + rm->timeout)
 322         {
 323           ip6_sv_reass_free (vm, rm, rt, reass);
 324           reass = NULL;
 325         }
 326     }
 327
 328   if (reass)
 329     {
 330       reass->last_heard = now;
 331       return reass;
 332     }
 333
 334   if (rt->reass_n >= rm->max_reass_n)
 335     {
 336       reass = pool_elt_at_index (rt->pool, rt->lru_first);
 337       ip6_sv_reass_free (vm, rm, rt, reass);
 338     }
 339
 340   pool_get (rt->pool, reass);
 341   clib_memset (reass, 0, sizeof (*reass));
 342   reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 343   ++rt->id_counter;
 344   ip6_sv_reass_init (reass);
 345   ++rt->reass_n;
 346
 347   reass->lru_prev = reass->lru_next = ~0;
 348
 349   if (~0 != rt->lru_last)
 350     {
 351       ip6_sv_reass_t *lru_last = pool_elt_at_index (rt->pool, rt->lru_last);
 352       reass->lru_prev = rt->lru_last;
 353       lru_last->lru_next = rt->lru_last = reass - rt->pool;
 354     }
 355
 356   if (~0 == rt->lru_first)
 357     {
 358       rt->lru_first = rt->lru_last = reass - rt->pool;
 359     }
 360
 361   reass->key.as_u64[0] = kv->kv.key[0];
 362   reass->key.as_u64[1] = kv->kv.key[1];
 363   reass->key.as_u64[2] = kv->kv.key[2];
 364   reass->key.as_u64[3] = kv->kv.key[3];
 365   reass->key.as_u64[4] = kv->kv.key[4];
 366   reass->key.as_u64[5] = kv->kv.key[5];
 367   kv->v.reass_index = (reass - rt->pool);
 368   kv->v.thread_index = vm->thread_index;
 369   reass->last_heard = now;
 370
 371   if (clib_bihash_add_del_48_8 (&rm->hash, &kv->kv, 1))
 372     {
 373       ip6_sv_reass_free (vm, rm, rt, reass);
 374       reass = NULL;
 375     }
 376
 377   return reass;
 378 }
 379
 380 always_inline ip6_sv_reass_rc_t
 381 ip6_sv_reass_update (vlib_main_t *vm, vlib_node_runtime_t *node,
 382                      ip6_sv_reass_main_t *rm, ip6_sv_reass_t *reass, u32 bi0,
 383                      ip6_frag_hdr_t *frag_hdr)
 384 {
 385   vlib_buffer_t *fb = vlib_get_buffer (vm, bi0);
 386   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 387   fvnb->ip.reass.ip6_frag_hdr_offset =
 388     (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
 389   ip6_header_t *fip = vlib_buffer_get_current (fb);
 390   if (fb->current_length < sizeof (*fip) ||
 391       fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
 392       fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
 393     {
 394       return IP6_SV_REASS_RC_INTERNAL_ERROR;
 395     }
 396
 397   u32 fragment_first = fvnb->ip.reass.fragment_first =
 398     ip6_frag_hdr_offset_bytes (frag_hdr);
 399   u32 fragment_length =
 400     vlib_buffer_length_in_chain (vm, fb) -
 401     (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 402   u32 fragment_last = fvnb->ip.reass.fragment_last =
 403     fragment_first + fragment_length - 1;
 404   fvnb->ip.reass.range_first = fragment_first;
 405   fvnb->ip.reass.range_last = fragment_last;
 406   fvnb->ip.reass.next_range_bi = ~0;
 407   if (0 == fragment_first)
 408     {
 409       if (!ip6_get_port
 410           (vm, fb, fip, fb->current_length, &reass->ip_proto,
 411            &reass->l4_src_port, &reass->l4_dst_port,
 412            &reass->icmp_type_or_tcp_flags, &reass->tcp_ack_number,
 413            &reass->tcp_seq_number))
 414         return IP6_SV_REASS_RC_UNSUPP_IP_PROTO;
 415
 416       reass->is_complete = true;
 417       vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
 418       if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 419         {
 420           ip6_sv_reass_add_trace (vm, node, reass, bi0, REASS_FINISH,
 421                                   reass->ip_proto, reass->l4_src_port,
 422                                   reass->l4_dst_port);
 423         }
 424     }
 425   vec_add1 (reass->cached_buffers, bi0);
 426   if (!reass->is_complete)
 427     {
 428       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 429         {
 430           ip6_sv_reass_add_trace (vm, node, reass, bi0, REASS_FRAGMENT_CACHE,
 431                                   reass->ip_proto, reass->l4_src_port,
 432                                   reass->l4_dst_port);
 433         }
 434       if (vec_len (reass->cached_buffers) > rm->max_reass_len)
 435         {
 436           return IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS;
 437         }
 438     }
 439   return IP6_SV_REASS_RC_OK;
 440 }
 441
 442 always_inline bool
 443 ip6_sv_reass_verify_upper_layer_present (vlib_node_runtime_t * node,
 444                                          vlib_buffer_t * b,
 445                                          ip6_frag_hdr_t * frag_hdr)
 446 {
 447   ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr;
 448   while (ip6_ext_hdr (tmp->next_hdr))
 449     {
 450       tmp = ip6_ext_next_header (tmp);
 451     }
 452   if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr)
 453     {
 454       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 455                                    ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
 456                                    0);
 457       b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
 458
 459       return false;
 460     }
 461   return true;
 462 }
 463
 464 always_inline bool
 465 ip6_sv_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
 466                                          vlib_buffer_t * b,
 467                                          ip6_frag_hdr_t * frag_hdr)
 468 {
 469   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 470   ip6_header_t *ip = vlib_buffer_get_current (b);
 471   int more_fragments = ip6_frag_hdr_more (frag_hdr);
 472   u32 fragment_length =
 473     vlib_buffer_length_in_chain (vm, b) -
 474     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 475   if (more_fragments && 0 != fragment_length % 8)
 476     {
 477       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 478                                    ICMP6_parameter_problem_erroneous_header_field,
 479                                    (u8 *) & ip->payload_length - (u8 *) ip);
 480       return false;
 481     }
 482   return true;
 483 }
 484
 485 always_inline bool
 486 ip6_sv_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
 487                                         vlib_buffer_t * b,
 488                                         ip6_frag_hdr_t * frag_hdr)
 489 {
 490   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 491   u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
 492   u32 fragment_length =
 493     vlib_buffer_length_in_chain (vm, b) -
 494     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 495   if (fragment_first + fragment_length > 65535)
 496     {
 497       ip6_header_t *ip0 = vlib_buffer_get_current (b);
 498       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 499                                    ICMP6_parameter_problem_erroneous_header_field,
 500                                    (u8 *) & frag_hdr->fragment_offset_and_more
 501                                    - (u8 *) ip0);
 502       return false;
 503     }
 504   return true;
 505 }
 506
 507 always_inline uword
 508 ip6_sv_reassembly_inline (vlib_main_t * vm,
 509                           vlib_node_runtime_t * node,
 510                           vlib_frame_t * frame, bool is_feature)
 511 {
 512   u32 *from = vlib_frame_vector_args (frame);
 513   u32 n_left_from, n_left_to_next, *to_next, next_index;
 514   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 515   ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
 516   clib_spinlock_lock (&rt->lock);
 517
 518   n_left_from = frame->n_vectors;
 519   next_index = node->cached_next_index;
 520
 521   while (n_left_from > 0)
 522     {
 523       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 524
 525       while (n_left_from > 0 && n_left_to_next > 0)
 526         {
 527           u32 bi0;
 528           vlib_buffer_t *b0;
 529           u32 next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 530           u32 error0 = IP6_ERROR_NONE;
 531
 532           bi0 = from[0];
 533           b0 = vlib_get_buffer (vm, bi0);
 534
 535           ip6_header_t *ip0 = vlib_buffer_get_current (b0);
 536           ip6_frag_hdr_t *frag_hdr = NULL;
 537           ip6_ext_header_t *prev_hdr;
 538           if (ip6_ext_hdr (ip0->protocol))
 539             {
 540               frag_hdr =
 541                 ip6_ext_header_find (vm, b0, ip0,
 542                                      IP_PROTOCOL_IPV6_FRAGMENTATION,
 543                                      &prev_hdr);
 544             }
 545           if (!frag_hdr)
 546             {
 547               // this is a regular packet - no fragmentation
 548               if (!ip6_get_port
 549                   (vm, b0, ip0, b0->current_length,
 550                    &(vnet_buffer (b0)->ip.reass.ip_proto),
 551                    &(vnet_buffer (b0)->ip.reass.l4_src_port),
 552                    &(vnet_buffer (b0)->ip.reass.l4_dst_port),
 553                    &(vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags),
 554                    &(vnet_buffer (b0)->ip.reass.tcp_ack_number),
 555                    &(vnet_buffer (b0)->ip.reass.tcp_seq_number)))
 556                 {
 557                   error0 = IP6_ERROR_REASS_UNSUPP_IP_PROTO;
 558                   b0->error = node->errors[error0];
 559                   next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 560                   goto packet_enqueue;
 561                 }
 562               vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
 563               next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
 564               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 565                 {
 566                   ip6_sv_reass_add_trace (
 567                     vm, node, NULL, bi0, REASS_PASSTHROUGH,
 568                     vnet_buffer (b0)->ip.reass.ip_proto,
 569                     vnet_buffer (b0)->ip.reass.l4_src_port,
 570                     vnet_buffer (b0)->ip.reass.l4_dst_port);
 571                 }
 572               goto packet_enqueue;
 573             }
 574           vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
 575             (u8 *) frag_hdr - (u8 *) ip0;
 576           if (0 == ip6_frag_hdr_offset (frag_hdr))
 577             {
 578               // first fragment - verify upper-layer is present
 579               if (!ip6_sv_reass_verify_upper_layer_present
 580                   (node, b0, frag_hdr))
 581                 {
 582                   next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 583                   goto packet_enqueue;
 584                 }
 585             }
 586           if (!ip6_sv_reass_verify_fragment_multiple_8 (vm, b0, frag_hdr) ||
 587               !ip6_sv_reass_verify_packet_size_lt_64k (vm, b0, frag_hdr))
 588             {
 589               next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 590               goto packet_enqueue;
 591             }
 592
 593           ip6_sv_reass_kv_t kv;
 594           u8 do_handoff = 0;
 595
 596           kv.k.as_u64[0] = ip0->src_address.as_u64[0];
 597           kv.k.as_u64[1] = ip0->src_address.as_u64[1];
 598           kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
 599           kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
 600           kv.k.as_u64[4] =
 601             ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
 602                             vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
 603             (u64) frag_hdr->identification;
 604           kv.k.as_u64[5] = ip0->protocol;
 605
 606           ip6_sv_reass_t *reass =
 607             ip6_sv_reass_find_or_create (vm, rm, rt, &kv, &do_handoff);
 608
 609           if (PREDICT_FALSE (do_handoff))
 610             {
 611               next0 = IP6_SV_REASSEMBLY_NEXT_HANDOFF;
 612               vnet_buffer (b0)->ip.reass.owner_thread_index =
 613                 kv.v.thread_index;
 614               goto packet_enqueue;
 615             }
 616
 617           if (!reass)
 618             {
 619               next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 620               error0 = IP6_ERROR_REASS_LIMIT_REACHED;
 621               b0->error = node->errors[error0];
 622               goto packet_enqueue;
 623             }
 624
 625           if (reass->is_complete)
 626             {
 627               vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 628                 ! !ip6_frag_hdr_offset (frag_hdr);
 629               vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 630               vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 631                 reass->icmp_type_or_tcp_flags;
 632               vnet_buffer (b0)->ip.reass.tcp_ack_number =
 633                 reass->tcp_ack_number;
 634               vnet_buffer (b0)->ip.reass.tcp_seq_number =
 635                 reass->tcp_seq_number;
 636               vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 637               vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 638               next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
 639               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 640                 {
 641                   ip6_sv_reass_add_trace (
 642                     vm, node, reass, bi0, REASS_FRAGMENT_FORWARD,
 643                     reass->ip_proto, reass->l4_src_port, reass->l4_dst_port);
 644                 }
 645               goto packet_enqueue;
 646             }
 647
 648           switch (ip6_sv_reass_update (vm, node, rm, reass, bi0, frag_hdr))
 649             {
 650             case IP6_SV_REASS_RC_OK:
 651               /* nothing to do here */
 652               break;
 653             case IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS:
 654               vlib_node_increment_counter (vm, node->node_index,
 655                                            IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
 656                                            1);
 657               ip6_sv_reass_free (vm, rm, rt, reass);
 658               goto next_packet;
 659               break;
 660             case IP6_SV_REASS_RC_UNSUPP_IP_PROTO:
 661               vlib_node_increment_counter (vm, node->node_index,
 662                                            IP6_ERROR_REASS_UNSUPP_IP_PROTO,
 663                                            1);
 664               ip6_sv_reass_free (vm, rm, rt, reass);
 665               goto next_packet;
 666               break;
 667             case IP6_SV_REASS_RC_INTERNAL_ERROR:
 668               vlib_node_increment_counter (vm, node->node_index,
 669                                            IP6_ERROR_REASS_INTERNAL_ERROR, 1);
 670               ip6_sv_reass_free (vm, rm, rt, reass);
 671               goto next_packet;
 672               break;
 673             }
 674
 675           if (reass->is_complete)
 676             {
 677               u32 idx;
 678               vec_foreach_index (idx, reass->cached_buffers)
 679               {
 680                 u32 bi0 = vec_elt (reass->cached_buffers, idx);
 681                 if (0 == n_left_to_next)
 682                   {
 683                     vlib_put_next_frame (vm, node, next_index,
 684                                          n_left_to_next);
 685                     vlib_get_next_frame (vm, node, next_index, to_next,
 686                                          n_left_to_next);
 687                   }
 688                 to_next[0] = bi0;
 689                 to_next += 1;
 690                 n_left_to_next -= 1;
 691                 b0 = vlib_get_buffer (vm, bi0);
 692                 if (is_feature)
 693                   {
 694                     vnet_feature_next (&next0, b0);
 695                   }
 696                 frag_hdr =
 697                   vlib_buffer_get_current (b0) +
 698                   vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset;
 699                 vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 700                   ! !ip6_frag_hdr_offset (frag_hdr);
 701                 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 702                 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 703                   reass->icmp_type_or_tcp_flags;
 704                 vnet_buffer (b0)->ip.reass.tcp_ack_number =
 705                   reass->tcp_ack_number;
 706                 vnet_buffer (b0)->ip.reass.tcp_seq_number =
 707                   reass->tcp_seq_number;
 708                 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 709                 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 710                 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 711                   {
 712                     ip6_sv_reass_add_trace (
 713                       vm, node, reass, bi0, REASS_FRAGMENT_FORWARD,
 714                       reass->ip_proto, reass->l4_src_port, reass->l4_dst_port);
 715                   }
 716                 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 717                                                  to_next, n_left_to_next, bi0,
 718                                                  next0);
 719               }
 720               _vec_len (reass->cached_buffers) = 0;     // buffers are owned by frame now
 721             }
 722           goto next_packet;
 723
 724         packet_enqueue:
 725           to_next[0] = bi0;
 726           to_next += 1;
 727           n_left_to_next -= 1;
 728           if (is_feature && IP6_ERROR_NONE == error0)
 729             {
 730               b0 = vlib_get_buffer (vm, bi0);
 731               vnet_feature_next (&next0, b0);
 732             }
 733           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 734                                            n_left_to_next, bi0, next0);
 735
 736         next_packet:
 737           from += 1;
 738           n_left_from -= 1;
 739         }
 740
 741       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 742     }
 743
 744   clib_spinlock_unlock (&rt->lock);
 745   return frame->n_vectors;
 746 }
 747
 748 static char *ip6_sv_reassembly_error_strings[] = {
 749 #define _(sym, string) string,
 750   foreach_ip6_error
 751 #undef _
 752 };
 753
 754 VLIB_NODE_FN (ip6_sv_reass_node) (vlib_main_t * vm,
 755                                   vlib_node_runtime_t * node,
 756                                   vlib_frame_t * frame)
 757 {
 758   return ip6_sv_reassembly_inline (vm, node, frame, false /* is_feature */ );
 759 }
 760
 761 /* *INDENT-OFF* */
 762 VLIB_REGISTER_NODE (ip6_sv_reass_node) = {
 763     .name = "ip6-sv-reassembly",
 764     .vector_size = sizeof (u32),
 765     .format_trace = format_ip6_sv_reass_trace,
 766     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
 767     .error_strings = ip6_sv_reassembly_error_strings,
 768     .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
 769     .next_nodes =
 770         {
 771                 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
 772                 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
 773                 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
 774                 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reassembly-handoff",
 775         },
 776 };
 777 /* *INDENT-ON* */
 778
 779 VLIB_NODE_FN (ip6_sv_reass_node_feature) (vlib_main_t * vm,
 780                                           vlib_node_runtime_t * node,
 781                                           vlib_frame_t * frame)
 782 {
 783   return ip6_sv_reassembly_inline (vm, node, frame, true /* is_feature */ );
 784 }
 785
 786 /* *INDENT-OFF* */
 787 VLIB_REGISTER_NODE (ip6_sv_reass_node_feature) = {
 788     .name = "ip6-sv-reassembly-feature",
 789     .vector_size = sizeof (u32),
 790     .format_trace = format_ip6_sv_reass_trace,
 791     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
 792     .error_strings = ip6_sv_reassembly_error_strings,
 793     .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
 794     .next_nodes =
 795         {
 796                 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
 797                 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
 798                 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
 799                 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reass-feature-hoff",
 800         },
 801 };
 802 /* *INDENT-ON* */
 803
 804 /* *INDENT-OFF* */
 805 VNET_FEATURE_INIT (ip6_sv_reassembly_feature) = {
 806     .arc_name = "ip6-unicast",
 807     .node_name = "ip6-sv-reassembly-feature",
 808     .runs_before = VNET_FEATURES ("ip6-lookup"),
 809     .runs_after = 0,
 810 };
 811 /* *INDENT-ON* */
 812
 813 #ifndef CLIB_MARCH_VARIANT
 814 static u32
 815 ip6_sv_reass_get_nbuckets ()
 816 {
 817   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 818   u32 nbuckets;
 819   u8 i;
 820
 821   nbuckets = (u32) (rm->max_reass_n / IP6_SV_REASS_HT_LOAD_FACTOR);
 822
 823   for (i = 0; i < 31; i++)
 824     if ((1 << i) >= nbuckets)
 825       break;
 826   nbuckets = 1 << i;
 827
 828   return nbuckets;
 829 }
 830 #endif /* CLIB_MARCH_VARIANT */
 831
 832 typedef enum
 833 {
 834   IP6_EVENT_CONFIG_CHANGED = 1,
 835 } ip6_sv_reass_event_t;
 836
 837 #ifndef CLIB_MARCH_VARIANT
 838 typedef struct
 839 {
 840   int failure;
 841   clib_bihash_48_8_t *new_hash;
 842 } ip6_rehash_cb_ctx;
 843
 844 static int
 845 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
 846 {
 847   ip6_rehash_cb_ctx *ctx = _ctx;
 848   if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
 849     {
 850       ctx->failure = 1;
 851     }
 852   return (BIHASH_WALK_CONTINUE);
 853 }
 854
 855 static void
 856 ip6_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
 857                          u32 max_reassembly_length,
 858                          u32 expire_walk_interval_ms)
 859 {
 860   ip6_sv_reass_main.timeout_ms = timeout_ms;
 861   ip6_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
 862   ip6_sv_reass_main.max_reass_n = max_reassemblies;
 863   ip6_sv_reass_main.max_reass_len = max_reassembly_length;
 864   ip6_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
 865 }
 866
 867 vnet_api_error_t
 868 ip6_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
 869                   u32 max_reassembly_length, u32 expire_walk_interval_ms)
 870 {
 871   u32 old_nbuckets = ip6_sv_reass_get_nbuckets ();
 872   ip6_sv_reass_set_params (timeout_ms, max_reassemblies,
 873                            max_reassembly_length, expire_walk_interval_ms);
 874   vlib_process_signal_event (ip6_sv_reass_main.vlib_main,
 875                              ip6_sv_reass_main.ip6_sv_reass_expire_node_idx,
 876                              IP6_EVENT_CONFIG_CHANGED, 0);
 877   u32 new_nbuckets = ip6_sv_reass_get_nbuckets ();
 878   if (ip6_sv_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
 879     {
 880       clib_bihash_48_8_t new_hash;
 881       clib_memset (&new_hash, 0, sizeof (new_hash));
 882       ip6_rehash_cb_ctx ctx;
 883       ctx.failure = 0;
 884       ctx.new_hash = &new_hash;
 885       clib_bihash_init_48_8 (&new_hash, "ip6-sv-reass", new_nbuckets,
 886                              new_nbuckets * 1024);
 887       clib_bihash_foreach_key_value_pair_48_8 (&ip6_sv_reass_main.hash,
 888                                                ip6_rehash_cb, &ctx);
 889       if (ctx.failure)
 890         {
 891           clib_bihash_free_48_8 (&new_hash);
 892           return -1;
 893         }
 894       else
 895         {
 896           clib_bihash_free_48_8 (&ip6_sv_reass_main.hash);
 897           clib_memcpy_fast (&ip6_sv_reass_main.hash, &new_hash,
 898                             sizeof (ip6_sv_reass_main.hash));
 899           clib_bihash_copied (&ip6_sv_reass_main.hash, &new_hash);
 900         }
 901     }
 902   return 0;
 903 }
 904
 905 vnet_api_error_t
 906 ip6_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
 907                   u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
 908 {
 909   *timeout_ms = ip6_sv_reass_main.timeout_ms;
 910   *max_reassemblies = ip6_sv_reass_main.max_reass_n;
 911   *max_reassembly_length = ip6_sv_reass_main.max_reass_len;
 912   *expire_walk_interval_ms = ip6_sv_reass_main.expire_walk_interval_ms;
 913   return 0;
 914 }
 915
 916 static clib_error_t *
 917 ip6_sv_reass_init_function (vlib_main_t * vm)
 918 {
 919   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 920   clib_error_t *error = 0;
 921   u32 nbuckets;
 922   vlib_node_t *node;
 923
 924   rm->vlib_main = vm;
 925   rm->vnet_main = vnet_get_main ();
 926
 927   vec_validate (rm->per_thread_data, vlib_num_workers ());
 928   ip6_sv_reass_per_thread_t *rt;
 929   vec_foreach (rt, rm->per_thread_data)
 930   {
 931     clib_spinlock_init (&rt->lock);
 932     pool_alloc (rt->pool, rm->max_reass_n);
 933     rt->lru_first = rt->lru_last = ~0;
 934   }
 935
 936   node = vlib_get_node_by_name (vm, (u8 *) "ip6-sv-reassembly-expire-walk");
 937   ASSERT (node);
 938   rm->ip6_sv_reass_expire_node_idx = node->index;
 939
 940   ip6_sv_reass_set_params (IP6_SV_REASS_TIMEOUT_DEFAULT_MS,
 941                            IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
 942                            IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
 943                            IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
 944
 945   nbuckets = ip6_sv_reass_get_nbuckets ();
 946   clib_bihash_init_48_8 (&rm->hash, "ip6-sv-reass", nbuckets,
 947                          nbuckets * 1024);
 948
 949   node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
 950   ASSERT (node);
 951   rm->ip6_drop_idx = node->index;
 952   node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
 953   ASSERT (node);
 954   rm->ip6_icmp_error_idx = node->index;
 955
 956   if ((error = vlib_call_init_function (vm, ip_main_init)))
 957     return error;
 958
 959   rm->fq_index = vlib_frame_queue_main_init (ip6_sv_reass_node.index, 0);
 960   rm->fq_feature_index =
 961     vlib_frame_queue_main_init (ip6_sv_reass_node_feature.index, 0);
 962
 963   rm->feature_use_refcount_per_intf = NULL;
 964
 965   return error;
 966 }
 967
 968 VLIB_INIT_FUNCTION (ip6_sv_reass_init_function);
 969 #endif /* CLIB_MARCH_VARIANT */
 970
 971 static uword
 972 ip6_sv_reass_walk_expired (vlib_main_t *vm,
 973                            CLIB_UNUSED (vlib_node_runtime_t *node),
 974                            CLIB_UNUSED (vlib_frame_t *f))
 975 {
 976   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 977   uword event_type, *event_data = 0;
 978
 979   while (true)
 980     {
 981       vlib_process_wait_for_event_or_clock (vm,
 982                                             (f64) rm->expire_walk_interval_ms
 983                                             / (f64) MSEC_PER_SEC);
 984       event_type = vlib_process_get_events (vm, &event_data);
 985
 986       switch (event_type)
 987         {
 988         case ~0:
 989           /* no events => timeout */
 990           /* fallthrough */
 991         case IP6_EVENT_CONFIG_CHANGED:
 992           /* nothing to do here */
 993           break;
 994         default:
 995           clib_warning ("BUG: event type 0x%wx", event_type);
 996           break;
 997         }
 998       f64 now = vlib_time_now (vm);
 999
1000       ip6_sv_reass_t *reass;
1001       int *pool_indexes_to_free = NULL;
1002
1003       uword thread_index = 0;
1004       int index;
1005       const uword nthreads = vlib_num_workers () + 1;
1006       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1007         {
1008           ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1009           clib_spinlock_lock (&rt->lock);
1010
1011           vec_reset_length (pool_indexes_to_free);
1012           /* *INDENT-OFF* */
1013           pool_foreach_index (index, rt->pool)  {
1014                                 reass = pool_elt_at_index (rt->pool, index);
1015                                 if (now > reass->last_heard + rm->timeout)
1016                                   {
1017                                     vec_add1 (pool_indexes_to_free, index);
1018                                   }
1019                               }
1020           /* *INDENT-ON* */
1021           int *i;
1022           /* *INDENT-OFF* */
1023           vec_foreach (i, pool_indexes_to_free)
1024           {
1025             ip6_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1026             ip6_sv_reass_free (vm, rm, rt, reass);
1027           }
1028           /* *INDENT-ON* */
1029
1030           clib_spinlock_unlock (&rt->lock);
1031         }
1032
1033       vec_free (pool_indexes_to_free);
1034       if (event_data)
1035         {
1036           _vec_len (event_data) = 0;
1037         }
1038     }
1039
1040   return 0;
1041 }
1042
1043 /* *INDENT-OFF* */
1044 VLIB_REGISTER_NODE (ip6_sv_reass_expire_node) = {
1045     .function = ip6_sv_reass_walk_expired,
1046     .format_trace = format_ip6_sv_reass_trace,
1047     .type = VLIB_NODE_TYPE_PROCESS,
1048     .name = "ip6-sv-reassembly-expire-walk",
1049
1050     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
1051     .error_strings = ip6_sv_reassembly_error_strings,
1052
1053 };
1054 /* *INDENT-ON* */
1055
1056 static u8 *
1057 format_ip6_sv_reass_key (u8 * s, va_list * args)
1058 {
1059   ip6_sv_reass_key_t *key = va_arg (*args, ip6_sv_reass_key_t *);
1060   s =
1061     format (s, "fib_index: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1062             key->fib_index, format_ip6_address, &key->src, format_ip6_address,
1063             &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1064   return s;
1065 }
1066
1067 static u8 *
1068 format_ip6_sv_reass (u8 * s, va_list * args)
1069 {
1070   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1071   ip6_sv_reass_t *reass = va_arg (*args, ip6_sv_reass_t *);
1072
1073   s = format (s, "ID: %lu, key: %U, trace_op_counter: %u\n",
1074               reass->id, format_ip6_sv_reass_key, &reass->key,
1075               reass->trace_op_counter);
1076   vlib_buffer_t *b;
1077   u32 *bip;
1078   u32 counter = 0;
1079   vec_foreach (bip, reass->cached_buffers)
1080   {
1081     u32 bi = *bip;
1082     do
1083       {
1084         b = vlib_get_buffer (vm, bi);
1085         s = format (s, "  #%03u: bi: %u\n", counter, bi);
1086         ++counter;
1087         bi = b->next_buffer;
1088       }
1089     while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1090   }
1091   return s;
1092 }
1093
1094 static clib_error_t *
1095 show_ip6_sv_reass (vlib_main_t * vm, unformat_input_t * input,
1096                    CLIB_UNUSED (vlib_cli_command_t * lmd))
1097 {
1098   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1099
1100   vlib_cli_output (vm, "---------------------");
1101   vlib_cli_output (vm, "IP6 reassembly status");
1102   vlib_cli_output (vm, "---------------------");
1103   bool details = false;
1104   if (unformat (input, "details"))
1105     {
1106       details = true;
1107     }
1108
1109   u32 sum_reass_n = 0;
1110   u64 sum_buffers_n = 0;
1111   ip6_sv_reass_t *reass;
1112   uword thread_index;
1113   const uword nthreads = vlib_num_workers () + 1;
1114   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1115     {
1116       ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1117       clib_spinlock_lock (&rt->lock);
1118       if (details)
1119         {
1120           /* *INDENT-OFF* */
1121           pool_foreach (reass, rt->pool) {
1122             vlib_cli_output (vm, "%U", format_ip6_sv_reass, vm, reass);
1123           }
1124           /* *INDENT-ON* */
1125         }
1126       sum_reass_n += rt->reass_n;
1127       clib_spinlock_unlock (&rt->lock);
1128     }
1129   vlib_cli_output (vm, "---------------------");
1130   vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1131                    (long unsigned) sum_reass_n);
1132   vlib_cli_output (vm,
1133                    "Maximum configured concurrent shallow virtual IP6 reassemblies per worker-thread: %lu\n",
1134                    (long unsigned) rm->max_reass_n);
1135   vlib_cli_output (vm,
1136                    "Maximum configured amount of fragments per shallow "
1137                    "virtual IP6 reassembly: %lu\n",
1138                    (long unsigned) rm->max_reass_len);
1139   vlib_cli_output (vm,
1140                    "Maximum configured shallow virtual IP6 reassembly timeout: %lums\n",
1141                    (long unsigned) rm->timeout_ms);
1142   vlib_cli_output (vm,
1143                    "Maximum configured shallow virtual IP6 reassembly expire walk interval: %lums\n",
1144                    (long unsigned) rm->expire_walk_interval_ms);
1145   vlib_cli_output (vm, "Buffers in use: %lu\n",
1146                    (long unsigned) sum_buffers_n);
1147   return 0;
1148 }
1149
1150 /* *INDENT-OFF* */
1151 VLIB_CLI_COMMAND (show_ip6_sv_reassembly_cmd, static) = {
1152     .path = "show ip6-sv-reassembly",
1153     .short_help = "show ip6-sv-reassembly [details]",
1154     .function = show_ip6_sv_reass,
1155 };
1156 /* *INDENT-ON* */
1157
1158 #ifndef CLIB_MARCH_VARIANT
1159 vnet_api_error_t
1160 ip6_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1161 {
1162   return ip6_sv_reass_enable_disable_with_refcnt (sw_if_index,
1163                                                   enable_disable);
1164 }
1165 #endif /* CLIB_MARCH_VARIANT */
1166
1167 #define foreach_ip6_sv_reassembly_handoff_error                       \
1168 _(CONGESTION_DROP, "congestion drop")
1169
1170
1171 typedef enum
1172 {
1173 #define _(sym,str) IP6_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
1174   foreach_ip6_sv_reassembly_handoff_error
1175 #undef _
1176     IP6_SV_REASSEMBLY_HANDOFF_N_ERROR,
1177 } ip6_sv_reassembly_handoff_error_t;
1178
1179 static char *ip6_sv_reassembly_handoff_error_strings[] = {
1180 #define _(sym,string) string,
1181   foreach_ip6_sv_reassembly_handoff_error
1182 #undef _
1183 };
1184
1185 typedef struct
1186 {
1187   u32 next_worker_index;
1188 } ip6_sv_reassembly_handoff_trace_t;
1189
1190 static u8 *
1191 format_ip6_sv_reassembly_handoff_trace (u8 * s, va_list * args)
1192 {
1193   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1194   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1195   ip6_sv_reassembly_handoff_trace_t *t =
1196     va_arg (*args, ip6_sv_reassembly_handoff_trace_t *);
1197
1198   s =
1199     format (s, "ip6-sv-reassembly-handoff: next-worker %d",
1200             t->next_worker_index);
1201
1202   return s;
1203 }
1204
1205 always_inline uword
1206 ip6_sv_reassembly_handoff_inline (vlib_main_t * vm,
1207                                   vlib_node_runtime_t * node,
1208                                   vlib_frame_t * frame, bool is_feature)
1209 {
1210   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1211
1212   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1213   u32 n_enq, n_left_from, *from;
1214   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1215   u32 fq_index;
1216
1217   from = vlib_frame_vector_args (frame);
1218   n_left_from = frame->n_vectors;
1219   vlib_get_buffers (vm, from, bufs, n_left_from);
1220
1221   b = bufs;
1222   ti = thread_indices;
1223
1224   fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1225
1226   while (n_left_from > 0)
1227     {
1228       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1229
1230       if (PREDICT_FALSE
1231           ((node->flags & VLIB_NODE_FLAG_TRACE)
1232            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1233         {
1234           ip6_sv_reassembly_handoff_trace_t *t =
1235             vlib_add_trace (vm, node, b[0], sizeof (*t));
1236           t->next_worker_index = ti[0];
1237         }
1238
1239       n_left_from -= 1;
1240       ti += 1;
1241       b += 1;
1242     }
1243   n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from,
1244                                          thread_indices, frame->n_vectors, 1);
1245
1246   if (n_enq < frame->n_vectors)
1247     vlib_node_increment_counter (vm, node->node_index,
1248                                  IP6_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1249                                  frame->n_vectors - n_enq);
1250   return frame->n_vectors;
1251 }
1252
1253 VLIB_NODE_FN (ip6_sv_reassembly_handoff_node) (vlib_main_t * vm,
1254                                                vlib_node_runtime_t * node,
1255                                                vlib_frame_t * frame)
1256 {
1257   return ip6_sv_reassembly_handoff_inline (vm, node, frame,
1258                                            false /* is_feature */ );
1259 }
1260
1261 /* *INDENT-OFF* */
1262 VLIB_REGISTER_NODE (ip6_sv_reassembly_handoff_node) = {
1263   .name = "ip6-sv-reassembly-handoff",
1264   .vector_size = sizeof (u32),
1265   .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1266   .error_strings = ip6_sv_reassembly_handoff_error_strings,
1267   .format_trace = format_ip6_sv_reassembly_handoff_trace,
1268
1269   .n_next_nodes = 1,
1270
1271   .next_nodes = {
1272     [0] = "error-drop",
1273   },
1274 };
1275
1276
1277 VLIB_NODE_FN (ip6_sv_reassembly_feature_handoff_node) (vlib_main_t * vm,
1278                                vlib_node_runtime_t * node, vlib_frame_t * frame)
1279 {
1280   return ip6_sv_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1281 }
1282
1283
1284 /* *INDENT-OFF* */
1285 VLIB_REGISTER_NODE (ip6_sv_reassembly_feature_handoff_node) = {
1286   .name = "ip6-sv-reass-feature-hoff",
1287   .vector_size = sizeof (u32),
1288   .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1289   .error_strings = ip6_sv_reassembly_handoff_error_strings,
1290   .format_trace = format_ip6_sv_reassembly_handoff_trace,
1291
1292   .n_next_nodes = 1,
1293
1294   .next_nodes = {
1295     [0] = "error-drop",
1296   },
1297 };
1298 /* *INDENT-ON* */
1299
1300 #ifndef CLIB_MARCH_VARIANT
1301 int
1302 ip6_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1303 {
1304   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1305   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1306   if (is_enable)
1307     {
1308       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1309         {
1310           ++rm->feature_use_refcount_per_intf[sw_if_index];
1311           return vnet_feature_enable_disable ("ip6-unicast",
1312                                               "ip6-sv-reassembly-feature",
1313                                               sw_if_index, 1, 0, 0);
1314         }
1315       ++rm->feature_use_refcount_per_intf[sw_if_index];
1316     }
1317   else
1318     {
1319       --rm->feature_use_refcount_per_intf[sw_if_index];
1320       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1321         return vnet_feature_enable_disable ("ip6-unicast",
1322                                             "ip6-sv-reassembly-feature",
1323                                             sw_if_index, 0, 0, 0);
1324     }
1325   return 0;
1326 }
1327 #endif
1328
1329 /*
1330  * fd.io coding-style-patch-verification: ON
1331  *
1332  * Local Variables:
1333  * eval: (c-set-style "gnu")
1334  * End:
1335  */