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 xx_id;
  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   // l4 src port
 100   u16 l4_src_port;
 101   // l4 dst port
 102   u16 l4_dst_port;
 103   // lru indexes
 104   u32 lru_prev;
 105   u32 lru_next;
 106 } ip6_sv_reass_t;
 107
 108 typedef struct
 109 {
 110   ip6_sv_reass_t *pool;
 111   u32 reass_n;
 112   u32 id_counter;
 113   clib_spinlock_t lock;
 114   // lru indexes
 115   u32 lru_first;
 116   u32 lru_last;
 117 } ip6_sv_reass_per_thread_t;
 118
 119 typedef struct
 120 {
 121   // IPv6 config
 122   u32 timeout_ms;
 123   f64 timeout;
 124   u32 expire_walk_interval_ms;
 125   // maximum number of fragments in one reassembly
 126   u32 max_reass_len;
 127   // maximum number of reassemblies
 128   u32 max_reass_n;
 129
 130   // IPv6 runtime
 131   clib_bihash_48_8_t hash;
 132
 133   // per-thread data
 134   ip6_sv_reass_per_thread_t *per_thread_data;
 135
 136   // convenience
 137   vlib_main_t *vlib_main;
 138   vnet_main_t *vnet_main;
 139
 140   // node index of ip6-drop node
 141   u32 ip6_drop_idx;
 142   u32 ip6_icmp_error_idx;
 143   u32 ip6_sv_reass_expire_node_idx;
 144
 145   /** Worker handoff */
 146   u32 fq_index;
 147   u32 fq_feature_index;
 148
 149   // reference count for enabling/disabling feature - per interface
 150   u32 *feature_use_refcount_per_intf;
 151 } ip6_sv_reass_main_t;
 152
 153 extern ip6_sv_reass_main_t ip6_sv_reass_main;
 154
 155 #ifndef CLIB_MARCH_VARIANT
 156 ip6_sv_reass_main_t ip6_sv_reass_main;
 157 #endif /* CLIB_MARCH_VARIANT */
 158
 159 typedef enum
 160 {
 161   IP6_SV_REASSEMBLY_NEXT_INPUT,
 162   IP6_SV_REASSEMBLY_NEXT_DROP,
 163   IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR,
 164   IP6_SV_REASSEMBLY_NEXT_HANDOFF,
 165   IP6_SV_REASSEMBLY_N_NEXT,
 166 } ip6_sv_reass_next_t;
 167
 168 typedef enum
 169 {
 170   REASS_FRAGMENT_CACHE,
 171   REASS_FINISH,
 172   REASS_FRAGMENT_FORWARD,
 173 } ip6_sv_reass_trace_operation_e;
 174
 175 typedef struct
 176 {
 177   ip6_sv_reass_trace_operation_e action;
 178   u32 reass_id;
 179   u32 op_id;
 180   u8 ip_proto;
 181   u16 l4_src_port;
 182   u16 l4_dst_port;
 183 } ip6_sv_reass_trace_t;
 184
 185 static u8 *
 186 format_ip6_sv_reass_trace (u8 * s, va_list * args)
 187 {
 188   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 189   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 190   ip6_sv_reass_trace_t *t = va_arg (*args, ip6_sv_reass_trace_t *);
 191   s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
 192   switch (t->action)
 193     {
 194     case REASS_FRAGMENT_CACHE:
 195       s = format (s, "[cached]");
 196       break;
 197     case REASS_FINISH:
 198       s =
 199         format (s, "[finish, ip proto=%u, src_port=%u, dst_port=%u]",
 200                 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
 201                 clib_net_to_host_u16 (t->l4_dst_port));
 202       break;
 203     case REASS_FRAGMENT_FORWARD:
 204       s =
 205         format (s, "[forward, ip proto=%u, src_port=%u, dst_port=%u]",
 206                 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
 207                 clib_net_to_host_u16 (t->l4_dst_port));
 208       break;
 209     }
 210   return s;
 211 }
 212
 213 static void
 214 ip6_sv_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 215                         ip6_sv_reass_main_t * rm,
 216                         ip6_sv_reass_t * reass, u32 bi,
 217                         ip6_sv_reass_trace_operation_e action,
 218                         u32 ip_proto, u16 l4_src_port, u16 l4_dst_port)
 219 {
 220   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 221   ip6_sv_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 222   t->reass_id = reass->id;
 223   t->action = action;
 224   t->op_id = reass->trace_op_counter;
 225   t->ip_proto = ip_proto;
 226   t->l4_src_port = l4_src_port;
 227   t->l4_dst_port = l4_dst_port;
 228   ++reass->trace_op_counter;
 229 #if 0
 230   static u8 *s = NULL;
 231   s = format (s, "%U", format_ip6_sv_reass_trace, NULL, NULL, t);
 232   printf ("%.*s\n", vec_len (s), s);
 233   fflush (stdout);
 234   vec_reset_length (s);
 235 #endif
 236 }
 237
 238 always_inline void
 239 ip6_sv_reass_free (vlib_main_t * vm, ip6_sv_reass_main_t * rm,
 240                    ip6_sv_reass_per_thread_t * rt, ip6_sv_reass_t * reass)
 241 {
 242   clib_bihash_kv_48_8_t kv;
 243   kv.key[0] = reass->key.as_u64[0];
 244   kv.key[1] = reass->key.as_u64[1];
 245   kv.key[2] = reass->key.as_u64[2];
 246   kv.key[3] = reass->key.as_u64[3];
 247   kv.key[4] = reass->key.as_u64[4];
 248   kv.key[5] = reass->key.as_u64[5];
 249   clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
 250   vlib_buffer_free (vm, reass->cached_buffers,
 251                     vec_len (reass->cached_buffers));
 252   vec_free (reass->cached_buffers);
 253   reass->cached_buffers = NULL;
 254   if (~0 != reass->lru_prev)
 255     {
 256       ip6_sv_reass_t *lru_prev =
 257         pool_elt_at_index (rt->pool, reass->lru_prev);
 258       lru_prev->lru_next = reass->lru_next;
 259     }
 260   if (~0 != reass->lru_next)
 261     {
 262       ip6_sv_reass_t *lru_next =
 263         pool_elt_at_index (rt->pool, reass->lru_next);
 264       lru_next->lru_prev = reass->lru_prev;
 265     }
 266   if (rt->lru_first == reass - rt->pool)
 267     {
 268       rt->lru_first = reass->lru_next;
 269     }
 270   if (rt->lru_last == reass - rt->pool)
 271     {
 272       rt->lru_last = reass->lru_prev;
 273     }
 274   pool_put (rt->pool, reass);
 275   --rt->reass_n;
 276 }
 277
 278 always_inline void
 279 ip6_sv_reass_init (ip6_sv_reass_t * reass)
 280 {
 281   reass->cached_buffers = NULL;
 282   reass->is_complete = false;
 283 }
 284
 285 always_inline ip6_sv_reass_t *
 286 ip6_sv_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
 287                              ip6_sv_reass_main_t * rm,
 288                              ip6_sv_reass_per_thread_t * rt,
 289                              ip6_sv_reass_kv_t * kv, u32 * icmp_bi,
 290                              u8 * do_handoff)
 291 {
 292   ip6_sv_reass_t *reass = NULL;
 293   f64 now = vlib_time_now (rm->vlib_main);
 294
 295   if (!clib_bihash_search_48_8
 296       (&rm->hash, (clib_bihash_kv_48_8_t *) kv, (clib_bihash_kv_48_8_t *) kv))
 297     {
 298       if (vm->thread_index != kv->v.thread_index)
 299         {
 300           *do_handoff = 1;
 301           return NULL;
 302         }
 303       reass = pool_elt_at_index (rt->pool, kv->v.reass_index);
 304
 305       if (now > reass->last_heard + rm->timeout)
 306         {
 307           ip6_sv_reass_free (vm, rm, rt, reass);
 308           reass = NULL;
 309         }
 310     }
 311
 312   if (reass)
 313     {
 314       reass->last_heard = now;
 315       return reass;
 316     }
 317
 318   if (rt->reass_n >= rm->max_reass_n)
 319     {
 320       reass = pool_elt_at_index (rt->pool, rt->lru_last);
 321       ip6_sv_reass_free (vm, rm, rt, reass);
 322     }
 323
 324   pool_get (rt->pool, reass);
 325   clib_memset (reass, 0, sizeof (*reass));
 326   reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 327   ++rt->id_counter;
 328   ip6_sv_reass_init (reass);
 329   ++rt->reass_n;
 330
 331   reass->lru_prev = reass->lru_next = ~0;
 332
 333   if (~0 != rt->lru_last)
 334     {
 335       ip6_sv_reass_t *lru_last = pool_elt_at_index (rt->pool, rt->lru_last);
 336       reass->lru_prev = rt->lru_last;
 337       lru_last->lru_next = rt->lru_last = reass - rt->pool;
 338     }
 339
 340   if (~0 == rt->lru_first)
 341     {
 342       rt->lru_first = rt->lru_last = reass - rt->pool;
 343     }
 344
 345   reass->key.as_u64[0] = ((clib_bihash_kv_48_8_t *) kv)->key[0];
 346   reass->key.as_u64[1] = ((clib_bihash_kv_48_8_t *) kv)->key[1];
 347   reass->key.as_u64[2] = ((clib_bihash_kv_48_8_t *) kv)->key[2];
 348   reass->key.as_u64[3] = ((clib_bihash_kv_48_8_t *) kv)->key[3];
 349   reass->key.as_u64[4] = ((clib_bihash_kv_48_8_t *) kv)->key[4];
 350   reass->key.as_u64[5] = ((clib_bihash_kv_48_8_t *) kv)->key[5];
 351   kv->v.reass_index = (reass - rt->pool);
 352   kv->v.thread_index = vm->thread_index;
 353   reass->last_heard = now;
 354
 355   if (clib_bihash_add_del_48_8 (&rm->hash, (clib_bihash_kv_48_8_t *) kv, 1))
 356     {
 357       ip6_sv_reass_free (vm, rm, rt, reass);
 358       reass = NULL;
 359     }
 360
 361   return reass;
 362 }
 363
 364 always_inline ip6_sv_reass_rc_t
 365 ip6_sv_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 366                      ip6_sv_reass_main_t * rm, ip6_sv_reass_per_thread_t * rt,
 367                      ip6_sv_reass_t * reass, u32 bi0,
 368                      ip6_frag_hdr_t * frag_hdr)
 369 {
 370   vlib_buffer_t *fb = vlib_get_buffer (vm, bi0);
 371   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 372   fvnb->ip.reass.ip6_frag_hdr_offset =
 373     (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
 374   ip6_header_t *fip = vlib_buffer_get_current (fb);
 375   if (fb->current_length < sizeof (*fip) ||
 376       fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
 377       fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
 378     {
 379       return IP6_SV_REASS_RC_INTERNAL_ERROR;
 380     }
 381
 382   u32 fragment_first = fvnb->ip.reass.fragment_first =
 383     ip6_frag_hdr_offset_bytes (frag_hdr);
 384   u32 fragment_length =
 385     vlib_buffer_length_in_chain (vm, fb) -
 386     (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 387   u32 fragment_last = fvnb->ip.reass.fragment_last =
 388     fragment_first + fragment_length - 1;
 389   fvnb->ip.reass.range_first = fragment_first;
 390   fvnb->ip.reass.range_last = fragment_last;
 391   fvnb->ip.reass.next_range_bi = ~0;
 392   if (0 == fragment_first)
 393     {
 394       ip6_ext_header_t *ext_hdr = (void *) frag_hdr;
 395       while (ip6_ext_hdr (ext_hdr->next_hdr)
 396              && vlib_object_within_buffer_data (vm, fb, ext_hdr,
 397                                                 ext_hdr->n_data_u64s * 8))
 398         {
 399           ext_hdr = ip6_ext_next_header (ext_hdr);
 400         }
 401       reass->ip_proto = ext_hdr->next_hdr;
 402       reass->l4_src_port = ip6_get_port (fip, 1, fb->current_length);
 403       reass->l4_dst_port = ip6_get_port (fip, 0, fb->current_length);
 404       if (!reass->l4_src_port || !reass->l4_dst_port)
 405         return IP6_SV_REASS_RC_UNSUPP_IP_PROTO;
 406       reass->is_complete = true;
 407       vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
 408       if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 409         {
 410           ip6_sv_reass_add_trace (vm, node, rm, reass, bi0, REASS_FINISH,
 411                                   reass->ip_proto, reass->l4_src_port,
 412                                   reass->l4_dst_port);
 413         }
 414     }
 415   vec_add1 (reass->cached_buffers, bi0);
 416   if (!reass->is_complete)
 417     {
 418       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 419         {
 420           ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
 421                                   REASS_FRAGMENT_CACHE, reass->ip_proto,
 422                                   reass->l4_src_port, reass->l4_dst_port);
 423         }
 424       if (vec_len (reass->cached_buffers) > rm->max_reass_len)
 425         {
 426           return IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS;
 427         }
 428     }
 429   return IP6_SV_REASS_RC_OK;
 430 }
 431
 432 always_inline bool
 433 ip6_sv_reass_verify_upper_layer_present (vlib_node_runtime_t * node,
 434                                          vlib_buffer_t * b,
 435                                          ip6_frag_hdr_t * frag_hdr)
 436 {
 437   ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr;
 438   while (ip6_ext_hdr (tmp->next_hdr))
 439     {
 440       tmp = ip6_ext_next_header (tmp);
 441     }
 442   if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr)
 443     {
 444       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 445                                    ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
 446                                    0);
 447       b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
 448
 449       return false;
 450     }
 451   return true;
 452 }
 453
 454 always_inline bool
 455 ip6_sv_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
 456                                          vlib_node_runtime_t * node,
 457                                          vlib_buffer_t * b,
 458                                          ip6_frag_hdr_t * frag_hdr)
 459 {
 460   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 461   ip6_header_t *ip = vlib_buffer_get_current (b);
 462   int more_fragments = ip6_frag_hdr_more (frag_hdr);
 463   u32 fragment_length =
 464     vlib_buffer_length_in_chain (vm, b) -
 465     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 466   if (more_fragments && 0 != fragment_length % 8)
 467     {
 468       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 469                                    ICMP6_parameter_problem_erroneous_header_field,
 470                                    (u8 *) & ip->payload_length - (u8 *) ip);
 471       return false;
 472     }
 473   return true;
 474 }
 475
 476 always_inline bool
 477 ip6_sv_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
 478                                         vlib_node_runtime_t * node,
 479                                         vlib_buffer_t * b,
 480                                         ip6_frag_hdr_t * frag_hdr)
 481 {
 482   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 483   u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
 484   u32 fragment_length =
 485     vlib_buffer_length_in_chain (vm, b) -
 486     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 487   if (fragment_first + fragment_length > 65535)
 488     {
 489       ip6_header_t *ip0 = vlib_buffer_get_current (b);
 490       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 491                                    ICMP6_parameter_problem_erroneous_header_field,
 492                                    (u8 *) & frag_hdr->fragment_offset_and_more
 493                                    - (u8 *) ip0);
 494       return false;
 495     }
 496   return true;
 497 }
 498
 499 always_inline uword
 500 ip6_sv_reassembly_inline (vlib_main_t * vm,
 501                           vlib_node_runtime_t * node,
 502                           vlib_frame_t * frame, bool is_feature)
 503 {
 504   u32 *from = vlib_frame_vector_args (frame);
 505   u32 n_left_from, n_left_to_next, *to_next, next_index;
 506   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 507   ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
 508   clib_spinlock_lock (&rt->lock);
 509
 510   n_left_from = frame->n_vectors;
 511   next_index = node->cached_next_index;
 512
 513   while (n_left_from > 0)
 514     {
 515       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 516
 517       while (n_left_from > 0 && n_left_to_next > 0)
 518         {
 519           u32 bi0;
 520           vlib_buffer_t *b0;
 521           u32 next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 522           u32 error0 = IP6_ERROR_NONE;
 523           u32 icmp_bi = ~0;
 524
 525           bi0 = from[0];
 526           b0 = vlib_get_buffer (vm, bi0);
 527
 528           ip6_header_t *ip0 = vlib_buffer_get_current (b0);
 529           ip6_frag_hdr_t *frag_hdr = NULL;
 530           ip6_ext_header_t *prev_hdr;
 531           if (ip6_ext_hdr (ip0->protocol))
 532             {
 533               frag_hdr =
 534                 ip6_ext_header_find (vm, b0, ip0,
 535                                      IP_PROTOCOL_IPV6_FRAGMENTATION,
 536                                      &prev_hdr);
 537             }
 538           if (!frag_hdr)
 539             {
 540               // this is a regular packet - no fragmentation
 541               vnet_buffer (b0)->ip.reass.ip_proto = ip0->protocol;
 542               vnet_buffer (b0)->ip.reass.l4_src_port =
 543                 ip6_get_port (ip0, 1, b0->current_length);
 544               vnet_buffer (b0)->ip.reass.l4_dst_port =
 545                 ip6_get_port (ip0, 0, b0->current_length);
 546               next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
 547               goto packet_enqueue;
 548             }
 549           if (0 == ip6_frag_hdr_offset (frag_hdr))
 550             {
 551               // first fragment - verify upper-layer is present
 552               if (!ip6_sv_reass_verify_upper_layer_present
 553                   (node, b0, frag_hdr))
 554                 {
 555                   next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 556                   goto packet_enqueue;
 557                 }
 558             }
 559           if (!ip6_sv_reass_verify_fragment_multiple_8
 560               (vm, node, b0, frag_hdr)
 561               || !ip6_sv_reass_verify_packet_size_lt_64k (vm, node, b0,
 562                                                           frag_hdr))
 563             {
 564               next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 565               goto packet_enqueue;
 566             }
 567           vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
 568             (u8 *) frag_hdr - (u8 *) ip0;
 569
 570           ip6_sv_reass_kv_t kv;
 571           u8 do_handoff = 0;
 572
 573           kv.k.as_u64[0] = ip0->src_address.as_u64[0];
 574           kv.k.as_u64[1] = ip0->src_address.as_u64[1];
 575           kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
 576           kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
 577           kv.k.as_u64[4] =
 578             ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
 579                             vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
 580             (u64) frag_hdr->identification;
 581           kv.k.as_u64[5] = ip0->protocol;
 582
 583           ip6_sv_reass_t *reass =
 584             ip6_sv_reass_find_or_create (vm, node, rm, rt, &kv, &icmp_bi,
 585                                          &do_handoff);
 586
 587           if (PREDICT_FALSE (do_handoff))
 588             {
 589               next0 = IP6_SV_REASSEMBLY_NEXT_HANDOFF;
 590               vnet_buffer (b0)->ip.reass.owner_thread_index =
 591                 kv.v.thread_index;
 592             }
 593
 594           if (!reass)
 595             {
 596               next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 597               error0 = IP6_ERROR_REASS_LIMIT_REACHED;
 598               goto packet_enqueue;
 599             }
 600
 601           if (reass->is_complete)
 602             {
 603               vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 604               vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 605               vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 606               next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
 607               error0 = IP6_ERROR_NONE;
 608               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 609                 {
 610                   ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
 611                                           REASS_FRAGMENT_FORWARD,
 612                                           reass->ip_proto,
 613                                           reass->l4_src_port,
 614                                           reass->l4_dst_port);
 615                 }
 616               goto packet_enqueue;
 617             }
 618
 619           switch (ip6_sv_reass_update
 620                   (vm, node, rm, rt, reass, bi0, frag_hdr))
 621             {
 622             case IP6_SV_REASS_RC_OK:
 623               /* nothing to do here */
 624               break;
 625             case IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS:
 626               vlib_node_increment_counter (vm, node->node_index,
 627                                            IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
 628                                            1);
 629               ip6_sv_reass_free (vm, rm, rt, reass);
 630               goto next_packet;
 631               break;
 632             case IP6_SV_REASS_RC_UNSUPP_IP_PROTO:
 633               vlib_node_increment_counter (vm, node->node_index,
 634                                            IP6_ERROR_REASS_UNSUPP_IP_PROTO,
 635                                            1);
 636               ip6_sv_reass_free (vm, rm, rt, reass);
 637               goto next_packet;
 638               break;
 639             case IP6_SV_REASS_RC_INTERNAL_ERROR:
 640               vlib_node_increment_counter (vm, node->node_index,
 641                                            IP6_ERROR_REASS_INTERNAL_ERROR, 1);
 642               ip6_sv_reass_free (vm, rm, rt, reass);
 643               goto next_packet;
 644               break;
 645             }
 646
 647           b0->error = node->errors[error0];
 648
 649           if (reass->is_complete)
 650             {
 651               u32 idx;
 652               vec_foreach_index (idx, reass->cached_buffers)
 653               {
 654                 u32 bi0 = vec_elt (reass->cached_buffers, idx);
 655                 if (0 == n_left_to_next)
 656                   {
 657                     vlib_put_next_frame (vm, node, next_index,
 658                                          n_left_to_next);
 659                     vlib_get_next_frame (vm, node, next_index, to_next,
 660                                          n_left_to_next);
 661                   }
 662                 to_next[0] = bi0;
 663                 to_next += 1;
 664                 n_left_to_next -= 1;
 665                 b0 = vlib_get_buffer (vm, bi0);
 666                 if (is_feature)
 667                   {
 668                     vnet_feature_next (&next0, b0);
 669                   }
 670                 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 671                 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 672                 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 673                 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 674                   {
 675                     ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
 676                                             REASS_FRAGMENT_FORWARD,
 677                                             reass->ip_proto,
 678                                             reass->l4_src_port,
 679                                             reass->l4_dst_port);
 680                   }
 681                 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 682                                                  to_next, n_left_to_next, bi0,
 683                                                  next0);
 684               }
 685               _vec_len (reass->cached_buffers) = 0;     // buffers are owned by frame now
 686             }
 687           goto next_packet;
 688
 689         packet_enqueue:
 690           to_next[0] = bi0;
 691           to_next += 1;
 692           n_left_to_next -= 1;
 693           if (is_feature && IP6_ERROR_NONE == error0)
 694             {
 695               b0 = vlib_get_buffer (vm, bi0);
 696               vnet_feature_next (&next0, b0);
 697             }
 698           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 699                                            n_left_to_next, bi0, next0);
 700
 701           if (~0 != icmp_bi)
 702             {
 703               next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 704               to_next[0] = icmp_bi;
 705               to_next += 1;
 706               n_left_to_next -= 1;
 707               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 708                                                n_left_to_next, icmp_bi,
 709                                                next0);
 710             }
 711
 712         next_packet:
 713           from += 1;
 714           n_left_from -= 1;
 715         }
 716
 717       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 718     }
 719
 720   clib_spinlock_unlock (&rt->lock);
 721   return frame->n_vectors;
 722 }
 723
 724 static char *ip6_sv_reassembly_error_strings[] = {
 725 #define _(sym, string) string,
 726   foreach_ip6_error
 727 #undef _
 728 };
 729
 730 VLIB_NODE_FN (ip6_sv_reass_node) (vlib_main_t * vm,
 731                                   vlib_node_runtime_t * node,
 732                                   vlib_frame_t * frame)
 733 {
 734   return ip6_sv_reassembly_inline (vm, node, frame, false /* is_feature */ );
 735 }
 736
 737 /* *INDENT-OFF* */
 738 VLIB_REGISTER_NODE (ip6_sv_reass_node) = {
 739     .name = "ip6-sv-reassembly",
 740     .vector_size = sizeof (u32),
 741     .format_trace = format_ip6_sv_reass_trace,
 742     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
 743     .error_strings = ip6_sv_reassembly_error_strings,
 744     .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
 745     .next_nodes =
 746         {
 747                 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
 748                 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
 749                 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
 750                 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reassembly-handoff",
 751         },
 752 };
 753 /* *INDENT-ON* */
 754
 755 VLIB_NODE_FN (ip6_sv_reass_node_feature) (vlib_main_t * vm,
 756                                           vlib_node_runtime_t * node,
 757                                           vlib_frame_t * frame)
 758 {
 759   return ip6_sv_reassembly_inline (vm, node, frame, true /* is_feature */ );
 760 }
 761
 762 /* *INDENT-OFF* */
 763 VLIB_REGISTER_NODE (ip6_sv_reass_node_feature) = {
 764     .name = "ip6-sv-reassembly-feature",
 765     .vector_size = sizeof (u32),
 766     .format_trace = format_ip6_sv_reass_trace,
 767     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
 768     .error_strings = ip6_sv_reassembly_error_strings,
 769     .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
 770     .next_nodes =
 771         {
 772                 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
 773                 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
 774                 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
 775                 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reass-feature-hoff",
 776         },
 777 };
 778 /* *INDENT-ON* */
 779
 780 /* *INDENT-OFF* */
 781 VNET_FEATURE_INIT (ip6_sv_reassembly_feature) = {
 782     .arc_name = "ip6-unicast",
 783     .node_name = "ip6-sv-reassembly-feature",
 784     .runs_before = VNET_FEATURES ("ip6-lookup"),
 785     .runs_after = 0,
 786 };
 787 /* *INDENT-ON* */
 788
 789 #ifndef CLIB_MARCH_VARIANT
 790 static u32
 791 ip6_sv_reass_get_nbuckets ()
 792 {
 793   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 794   u32 nbuckets;
 795   u8 i;
 796
 797   nbuckets = (u32) (rm->max_reass_n / IP6_SV_REASS_HT_LOAD_FACTOR);
 798
 799   for (i = 0; i < 31; i++)
 800     if ((1 << i) >= nbuckets)
 801       break;
 802   nbuckets = 1 << i;
 803
 804   return nbuckets;
 805 }
 806 #endif /* CLIB_MARCH_VARIANT */
 807
 808 typedef enum
 809 {
 810   IP6_EVENT_CONFIG_CHANGED = 1,
 811 } ip6_sv_reass_event_t;
 812
 813 #ifndef CLIB_MARCH_VARIANT
 814 typedef struct
 815 {
 816   int failure;
 817   clib_bihash_48_8_t *new_hash;
 818 } ip6_rehash_cb_ctx;
 819
 820 static void
 821 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
 822 {
 823   ip6_rehash_cb_ctx *ctx = _ctx;
 824   if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
 825     {
 826       ctx->failure = 1;
 827     }
 828 }
 829
 830 static void
 831 ip6_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
 832                          u32 max_reassembly_length,
 833                          u32 expire_walk_interval_ms)
 834 {
 835   ip6_sv_reass_main.timeout_ms = timeout_ms;
 836   ip6_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
 837   ip6_sv_reass_main.max_reass_n = max_reassemblies;
 838   ip6_sv_reass_main.max_reass_len = max_reassembly_length;
 839   ip6_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
 840 }
 841
 842 vnet_api_error_t
 843 ip6_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
 844                   u32 max_reassembly_length, u32 expire_walk_interval_ms)
 845 {
 846   u32 old_nbuckets = ip6_sv_reass_get_nbuckets ();
 847   ip6_sv_reass_set_params (timeout_ms, max_reassemblies,
 848                            max_reassembly_length, expire_walk_interval_ms);
 849   vlib_process_signal_event (ip6_sv_reass_main.vlib_main,
 850                              ip6_sv_reass_main.ip6_sv_reass_expire_node_idx,
 851                              IP6_EVENT_CONFIG_CHANGED, 0);
 852   u32 new_nbuckets = ip6_sv_reass_get_nbuckets ();
 853   if (ip6_sv_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
 854     {
 855       clib_bihash_48_8_t new_hash;
 856       clib_memset (&new_hash, 0, sizeof (new_hash));
 857       ip6_rehash_cb_ctx ctx;
 858       ctx.failure = 0;
 859       ctx.new_hash = &new_hash;
 860       clib_bihash_init_48_8 (&new_hash, "ip6-sv-reass", new_nbuckets,
 861                              new_nbuckets * 1024);
 862       clib_bihash_foreach_key_value_pair_48_8 (&ip6_sv_reass_main.hash,
 863                                                ip6_rehash_cb, &ctx);
 864       if (ctx.failure)
 865         {
 866           clib_bihash_free_48_8 (&new_hash);
 867           return -1;
 868         }
 869       else
 870         {
 871           clib_bihash_free_48_8 (&ip6_sv_reass_main.hash);
 872           clib_memcpy_fast (&ip6_sv_reass_main.hash, &new_hash,
 873                             sizeof (ip6_sv_reass_main.hash));
 874           clib_bihash_copied (&ip6_sv_reass_main.hash, &new_hash);
 875         }
 876     }
 877   return 0;
 878 }
 879
 880 vnet_api_error_t
 881 ip6_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
 882                   u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
 883 {
 884   *timeout_ms = ip6_sv_reass_main.timeout_ms;
 885   *max_reassemblies = ip6_sv_reass_main.max_reass_n;
 886   *max_reassembly_length = ip6_sv_reass_main.max_reass_len;
 887   *expire_walk_interval_ms = ip6_sv_reass_main.expire_walk_interval_ms;
 888   return 0;
 889 }
 890
 891 static clib_error_t *
 892 ip6_sv_reass_init_function (vlib_main_t * vm)
 893 {
 894   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 895   clib_error_t *error = 0;
 896   u32 nbuckets;
 897   vlib_node_t *node;
 898
 899   rm->vlib_main = vm;
 900   rm->vnet_main = vnet_get_main ();
 901
 902   vec_validate (rm->per_thread_data, vlib_num_workers ());
 903   ip6_sv_reass_per_thread_t *rt;
 904   vec_foreach (rt, rm->per_thread_data)
 905   {
 906     clib_spinlock_init (&rt->lock);
 907     pool_alloc (rt->pool, rm->max_reass_n);
 908     rt->lru_first = rt->lru_last = ~0;
 909   }
 910
 911   node = vlib_get_node_by_name (vm, (u8 *) "ip6-sv-reassembly-expire-walk");
 912   ASSERT (node);
 913   rm->ip6_sv_reass_expire_node_idx = node->index;
 914
 915   ip6_sv_reass_set_params (IP6_SV_REASS_TIMEOUT_DEFAULT_MS,
 916                            IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
 917                            IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
 918                            IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
 919
 920   nbuckets = ip6_sv_reass_get_nbuckets ();
 921   clib_bihash_init_48_8 (&rm->hash, "ip6-sv-reass", nbuckets,
 922                          nbuckets * 1024);
 923
 924   node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
 925   ASSERT (node);
 926   rm->ip6_drop_idx = node->index;
 927   node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
 928   ASSERT (node);
 929   rm->ip6_icmp_error_idx = node->index;
 930
 931   if ((error = vlib_call_init_function (vm, ip_main_init)))
 932     return error;
 933   ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
 934                          ip6_sv_reass_node.index);
 935
 936   rm->fq_index = vlib_frame_queue_main_init (ip6_sv_reass_node.index, 0);
 937   rm->fq_feature_index =
 938     vlib_frame_queue_main_init (ip6_sv_reass_node_feature.index, 0);
 939
 940   rm->feature_use_refcount_per_intf = NULL;
 941
 942   return error;
 943 }
 944
 945 VLIB_INIT_FUNCTION (ip6_sv_reass_init_function);
 946 #endif /* CLIB_MARCH_VARIANT */
 947
 948 static uword
 949 ip6_sv_reass_walk_expired (vlib_main_t * vm,
 950                            vlib_node_runtime_t * node, vlib_frame_t * f)
 951 {
 952   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 953   uword event_type, *event_data = 0;
 954
 955   while (true)
 956     {
 957       vlib_process_wait_for_event_or_clock (vm,
 958                                             (f64) rm->expire_walk_interval_ms
 959                                             / (f64) MSEC_PER_SEC);
 960       event_type = vlib_process_get_events (vm, &event_data);
 961
 962       switch (event_type)
 963         {
 964         case ~0:                /* no events => timeout */
 965           /* nothing to do here */
 966           break;
 967         case IP6_EVENT_CONFIG_CHANGED:
 968           break;
 969         default:
 970           clib_warning ("BUG: event type 0x%wx", event_type);
 971           break;
 972         }
 973       f64 now = vlib_time_now (vm);
 974
 975       ip6_sv_reass_t *reass;
 976       int *pool_indexes_to_free = NULL;
 977
 978       uword thread_index = 0;
 979       int index;
 980       const uword nthreads = vlib_num_workers () + 1;
 981       u32 *vec_icmp_bi = NULL;
 982       for (thread_index = 0; thread_index < nthreads; ++thread_index)
 983         {
 984           ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
 985           clib_spinlock_lock (&rt->lock);
 986
 987           vec_reset_length (pool_indexes_to_free);
 988           /* *INDENT-OFF* */
 989           pool_foreach_index (index, rt->pool, ({
 990                                 reass = pool_elt_at_index (rt->pool, index);
 991                                 if (now > reass->last_heard + rm->timeout)
 992                                   {
 993                                     vec_add1 (pool_indexes_to_free, index);
 994                                   }
 995                               }));
 996           /* *INDENT-ON* */
 997           int *i;
 998           /* *INDENT-OFF* */
 999           vec_foreach (i, pool_indexes_to_free)
1000           {
1001             ip6_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1002             ip6_sv_reass_free (vm, rm, rt, reass);
1003           }
1004           /* *INDENT-ON* */
1005
1006           clib_spinlock_unlock (&rt->lock);
1007         }
1008
1009       while (vec_len (vec_icmp_bi) > 0)
1010         {
1011           vlib_frame_t *f =
1012             vlib_get_frame_to_node (vm, rm->ip6_icmp_error_idx);
1013           u32 *to_next = vlib_frame_vector_args (f);
1014           u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
1015           int trace_frame = 0;
1016           while (vec_len (vec_icmp_bi) > 0 && n_left_to_next > 0)
1017             {
1018               u32 bi = vec_pop (vec_icmp_bi);
1019               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1020               if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1021                 {
1022                   trace_frame = 1;
1023                 }
1024               b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
1025               to_next[0] = bi;
1026               ++f->n_vectors;
1027               to_next += 1;
1028               n_left_to_next -= 1;
1029             }
1030           f->frame_flags |= (trace_frame * VLIB_FRAME_TRACE);
1031           vlib_put_frame_to_node (vm, rm->ip6_icmp_error_idx, f);
1032         }
1033
1034       vec_free (pool_indexes_to_free);
1035       vec_free (vec_icmp_bi);
1036       if (event_data)
1037         {
1038           _vec_len (event_data) = 0;
1039         }
1040     }
1041
1042   return 0;
1043 }
1044
1045 /* *INDENT-OFF* */
1046 VLIB_REGISTER_NODE (ip6_sv_reass_expire_node) = {
1047     .function = ip6_sv_reass_walk_expired,
1048     .format_trace = format_ip6_sv_reass_trace,
1049     .type = VLIB_NODE_TYPE_PROCESS,
1050     .name = "ip6-sv-reassembly-expire-walk",
1051
1052     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
1053     .error_strings = ip6_sv_reassembly_error_strings,
1054
1055 };
1056 /* *INDENT-ON* */
1057
1058 static u8 *
1059 format_ip6_sv_reass_key (u8 * s, va_list * args)
1060 {
1061   ip6_sv_reass_key_t *key = va_arg (*args, ip6_sv_reass_key_t *);
1062   s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1063               key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1064               &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1065   return s;
1066 }
1067
1068 static u8 *
1069 format_ip6_sv_reass (u8 * s, va_list * args)
1070 {
1071   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1072   ip6_sv_reass_t *reass = va_arg (*args, ip6_sv_reass_t *);
1073
1074   s = format (s, "ID: %lu, key: %U, trace_op_counter: %u\n",
1075               reass->id, format_ip6_sv_reass_key, &reass->key,
1076               reass->trace_op_counter);
1077   vlib_buffer_t *b;
1078   u32 *bip;
1079   u32 counter = 0;
1080   vec_foreach (bip, reass->cached_buffers)
1081   {
1082     u32 bi = *bip;
1083     do
1084       {
1085         b = vlib_get_buffer (vm, bi);
1086         s = format (s, "  #%03u: bi: %u\n", counter, bi);
1087         ++counter;
1088         bi = b->next_buffer;
1089       }
1090     while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1091   }
1092   return s;
1093 }
1094
1095 static clib_error_t *
1096 show_ip6_sv_reass (vlib_main_t * vm, unformat_input_t * input,
1097                    CLIB_UNUSED (vlib_cli_command_t * lmd))
1098 {
1099   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1100
1101   vlib_cli_output (vm, "---------------------");
1102   vlib_cli_output (vm, "IP6 reassembly status");
1103   vlib_cli_output (vm, "---------------------");
1104   bool details = false;
1105   if (unformat (input, "details"))
1106     {
1107       details = true;
1108     }
1109
1110   u32 sum_reass_n = 0;
1111   u64 sum_buffers_n = 0;
1112   ip6_sv_reass_t *reass;
1113   uword thread_index;
1114   const uword nthreads = vlib_num_workers () + 1;
1115   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1116     {
1117       ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1118       clib_spinlock_lock (&rt->lock);
1119       if (details)
1120         {
1121           /* *INDENT-OFF* */
1122           pool_foreach (reass, rt->pool, {
1123             vlib_cli_output (vm, "%U", format_ip6_sv_reass, vm, reass);
1124           });
1125           /* *INDENT-ON* */
1126         }
1127       sum_reass_n += rt->reass_n;
1128       clib_spinlock_unlock (&rt->lock);
1129     }
1130   vlib_cli_output (vm, "---------------------");
1131   vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1132                    (long unsigned) sum_reass_n);
1133   vlib_cli_output (vm, "Maximum configured concurrent IP6 reassemblies per "
1134                    "worker-thread: %lu\n", (long unsigned) rm->max_reass_n);
1135   vlib_cli_output (vm, "Buffers in use: %lu\n",
1136                    (long unsigned) sum_buffers_n);
1137   return 0;
1138 }
1139
1140 /* *INDENT-OFF* */
1141 VLIB_CLI_COMMAND (show_ip6_sv_reassembly_cmd, static) = {
1142     .path = "show ip6-sv-reassembly",
1143     .short_help = "show ip6-sv-reassembly [details]",
1144     .function = show_ip6_sv_reass,
1145 };
1146 /* *INDENT-ON* */
1147
1148 #ifndef CLIB_MARCH_VARIANT
1149 vnet_api_error_t
1150 ip6_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1151 {
1152   return vnet_feature_enable_disable ("ip6-unicast",
1153                                       "ip6-sv-reassembly-feature",
1154                                       sw_if_index, enable_disable, 0, 0);
1155 }
1156 #endif /* CLIB_MARCH_VARIANT */
1157
1158 #define foreach_ip6_sv_reassembly_handoff_error                       \
1159 _(CONGESTION_DROP, "congestion drop")
1160
1161
1162 typedef enum
1163 {
1164 #define _(sym,str) IP6_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
1165   foreach_ip6_sv_reassembly_handoff_error
1166 #undef _
1167     IP6_SV_REASSEMBLY_HANDOFF_N_ERROR,
1168 } ip6_sv_reassembly_handoff_error_t;
1169
1170 static char *ip6_sv_reassembly_handoff_error_strings[] = {
1171 #define _(sym,string) string,
1172   foreach_ip6_sv_reassembly_handoff_error
1173 #undef _
1174 };
1175
1176 typedef struct
1177 {
1178   u32 next_worker_index;
1179 } ip6_sv_reassembly_handoff_trace_t;
1180
1181 static u8 *
1182 format_ip6_sv_reassembly_handoff_trace (u8 * s, va_list * args)
1183 {
1184   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1185   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1186   ip6_sv_reassembly_handoff_trace_t *t =
1187     va_arg (*args, ip6_sv_reassembly_handoff_trace_t *);
1188
1189   s =
1190     format (s, "ip6-sv-reassembly-handoff: next-worker %d",
1191             t->next_worker_index);
1192
1193   return s;
1194 }
1195
1196 always_inline uword
1197 ip6_sv_reassembly_handoff_inline (vlib_main_t * vm,
1198                                   vlib_node_runtime_t * node,
1199                                   vlib_frame_t * frame, bool is_feature)
1200 {
1201   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1202
1203   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1204   u32 n_enq, n_left_from, *from;
1205   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1206   u32 fq_index;
1207
1208   from = vlib_frame_vector_args (frame);
1209   n_left_from = frame->n_vectors;
1210   vlib_get_buffers (vm, from, bufs, n_left_from);
1211
1212   b = bufs;
1213   ti = thread_indices;
1214
1215   fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1216
1217   while (n_left_from > 0)
1218     {
1219       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1220
1221       if (PREDICT_FALSE
1222           ((node->flags & VLIB_NODE_FLAG_TRACE)
1223            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1224         {
1225           ip6_sv_reassembly_handoff_trace_t *t =
1226             vlib_add_trace (vm, node, b[0], sizeof (*t));
1227           t->next_worker_index = ti[0];
1228         }
1229
1230       n_left_from -= 1;
1231       ti += 1;
1232       b += 1;
1233     }
1234   n_enq =
1235     vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1236                                    frame->n_vectors, 1);
1237
1238   if (n_enq < frame->n_vectors)
1239     vlib_node_increment_counter (vm, node->node_index,
1240                                  IP6_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1241                                  frame->n_vectors - n_enq);
1242   return frame->n_vectors;
1243 }
1244
1245 VLIB_NODE_FN (ip6_sv_reassembly_handoff_node) (vlib_main_t * vm,
1246                                                vlib_node_runtime_t * node,
1247                                                vlib_frame_t * frame)
1248 {
1249   return ip6_sv_reassembly_handoff_inline (vm, node, frame,
1250                                            false /* is_feature */ );
1251 }
1252
1253 /* *INDENT-OFF* */
1254 VLIB_REGISTER_NODE (ip6_sv_reassembly_handoff_node) = {
1255   .name = "ip6-sv-reassembly-handoff",
1256   .vector_size = sizeof (u32),
1257   .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1258   .error_strings = ip6_sv_reassembly_handoff_error_strings,
1259   .format_trace = format_ip6_sv_reassembly_handoff_trace,
1260
1261   .n_next_nodes = 1,
1262
1263   .next_nodes = {
1264     [0] = "error-drop",
1265   },
1266 };
1267
1268
1269 VLIB_NODE_FN (ip6_sv_reassembly_feature_handoff_node) (vlib_main_t * vm,
1270                                vlib_node_runtime_t * node, vlib_frame_t * frame)
1271 {
1272   return ip6_sv_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1273 }
1274
1275
1276 /* *INDENT-OFF* */
1277 VLIB_REGISTER_NODE (ip6_sv_reassembly_feature_handoff_node) = {
1278   .name = "ip6-sv-reass-feature-hoff",
1279   .vector_size = sizeof (u32),
1280   .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1281   .error_strings = ip6_sv_reassembly_handoff_error_strings,
1282   .format_trace = format_ip6_sv_reassembly_handoff_trace,
1283
1284   .n_next_nodes = 1,
1285
1286   .next_nodes = {
1287     [0] = "error-drop",
1288   },
1289 };
1290 /* *INDENT-ON* */
1291
1292 #ifndef CLIB_MARCH_VARIANT
1293 int
1294 ip6_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1295 {
1296   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1297   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1298   if (is_enable)
1299     {
1300       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1301         {
1302           ++rm->feature_use_refcount_per_intf[sw_if_index];
1303           return vnet_feature_enable_disable ("ip6-unicast",
1304                                               "ip6-sv-reassembly-feature",
1305                                               sw_if_index, 1, 0, 0);
1306         }
1307       ++rm->feature_use_refcount_per_intf[sw_if_index];
1308     }
1309   else
1310     {
1311       --rm->feature_use_refcount_per_intf[sw_if_index];
1312       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1313         return vnet_feature_enable_disable ("ip6-unicast",
1314                                             "ip6-sv-reassembly-feature",
1315                                             sw_if_index, 0, 0, 0);
1316     }
1317   return -1;
1318 }
1319 #endif
1320
1321 /*
1322  * fd.io coding-style-patch-verification: ON
1323  *
1324  * Local Variables:
1325  * eval: (c-set-style "gnu")
1326  * End:
1327  */