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
 150   u32 feature_use_refcount;
 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   ICMP_ERROR_FL_TOO_BIG,
 171   ICMP_ERROR_FL_NOT_MULT_8,
 172   REASS_FRAGMENT_CACHE,
 173   REASS_FINISH,
 174   REASS_FRAGMENT_FORWARD,
 175 } ip6_sv_reass_trace_operation_e;
 176
 177 typedef struct
 178 {
 179   ip6_sv_reass_trace_operation_e action;
 180   u32 reass_id;
 181   u32 op_id;
 182   u8 ip_proto;
 183   u16 l4_src_port;
 184   u16 l4_dst_port;
 185 } ip6_sv_reass_trace_t;
 186
 187 static u8 *
 188 format_ip6_sv_reass_trace (u8 * s, va_list * args)
 189 {
 190   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 191   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 192   ip6_sv_reass_trace_t *t = va_arg (*args, ip6_sv_reass_trace_t *);
 193   s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
 194   switch (t->action)
 195     {
 196     case ICMP_ERROR_FL_TOO_BIG:
 197       s = format (s, "\n%Uicmp-error - frag_len > 65535 %U");
 198       break;
 199     case ICMP_ERROR_FL_NOT_MULT_8:
 200       s = format (s, "\n%Uicmp-error - frag_len mod 8 != 0 %U");
 201       break;
 202     case REASS_FRAGMENT_CACHE:
 203       s = format (s, "[cached]");
 204       break;
 205     case REASS_FINISH:
 206       s =
 207         format (s, "[finish, ip proto=%u, src_port=%u, dst_port=%u]",
 208                 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
 209                 clib_net_to_host_u16 (t->l4_dst_port));
 210       break;
 211     case REASS_FRAGMENT_FORWARD:
 212       s =
 213         format (s, "[forward, ip proto=%u, src_port=%u, dst_port=%u]",
 214                 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
 215                 clib_net_to_host_u16 (t->l4_dst_port));
 216       break;
 217     }
 218   return s;
 219 }
 220
 221 static void
 222 ip6_sv_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 223                         ip6_sv_reass_main_t * rm,
 224                         ip6_sv_reass_t * reass, u32 bi,
 225                         ip6_sv_reass_trace_operation_e action,
 226                         u32 ip_proto, u16 l4_src_port, u16 l4_dst_port)
 227 {
 228   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 229   ip6_sv_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 230   t->reass_id = reass->id;
 231   t->action = action;
 232   t->op_id = reass->trace_op_counter;
 233   t->ip_proto = ip_proto;
 234   t->l4_src_port = l4_src_port;
 235   t->l4_dst_port = l4_dst_port;
 236   ++reass->trace_op_counter;
 237 #if 0
 238   static u8 *s = NULL;
 239   s = format (s, "%U", format_ip6_sv_reass_trace, NULL, NULL, t);
 240   printf ("%.*s\n", vec_len (s), s);
 241   fflush (stdout);
 242   vec_reset_length (s);
 243 #endif
 244 }
 245
 246 always_inline void
 247 ip6_sv_reass_free (vlib_main_t * vm, ip6_sv_reass_main_t * rm,
 248                    ip6_sv_reass_per_thread_t * rt, ip6_sv_reass_t * reass)
 249 {
 250   clib_bihash_kv_48_8_t kv;
 251   kv.key[0] = reass->key.as_u64[0];
 252   kv.key[1] = reass->key.as_u64[1];
 253   kv.key[2] = reass->key.as_u64[2];
 254   kv.key[3] = reass->key.as_u64[3];
 255   kv.key[4] = reass->key.as_u64[4];
 256   kv.key[5] = reass->key.as_u64[5];
 257   clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
 258   vlib_buffer_free (vm, reass->cached_buffers,
 259                     vec_len (reass->cached_buffers));
 260   vec_free (reass->cached_buffers);
 261   reass->cached_buffers = NULL;
 262   if (~0 != reass->lru_prev)
 263     {
 264       ip6_sv_reass_t *lru_prev =
 265         pool_elt_at_index (rt->pool, reass->lru_prev);
 266       lru_prev->lru_next = reass->lru_next;
 267     }
 268   if (~0 != reass->lru_next)
 269     {
 270       ip6_sv_reass_t *lru_next =
 271         pool_elt_at_index (rt->pool, reass->lru_next);
 272       lru_next->lru_prev = reass->lru_prev;
 273     }
 274   if (rt->lru_first == reass - rt->pool)
 275     {
 276       rt->lru_first = reass->lru_next;
 277     }
 278   if (rt->lru_last == reass - rt->pool)
 279     {
 280       rt->lru_last = reass->lru_prev;
 281     }
 282   pool_put (rt->pool, reass);
 283   --rt->reass_n;
 284 }
 285
 286 always_inline void
 287 ip6_sv_reass_init (ip6_sv_reass_t * reass)
 288 {
 289   reass->cached_buffers = NULL;
 290   reass->is_complete = false;
 291 }
 292
 293 always_inline ip6_sv_reass_t *
 294 ip6_sv_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
 295                              ip6_sv_reass_main_t * rm,
 296                              ip6_sv_reass_per_thread_t * rt,
 297                              ip6_sv_reass_kv_t * kv, u32 * icmp_bi,
 298                              u8 * do_handoff)
 299 {
 300   ip6_sv_reass_t *reass = NULL;
 301   f64 now = vlib_time_now (rm->vlib_main);
 302
 303   if (!clib_bihash_search_48_8
 304       (&rm->hash, (clib_bihash_kv_48_8_t *) kv, (clib_bihash_kv_48_8_t *) kv))
 305     {
 306       if (vm->thread_index != kv->v.thread_index)
 307         {
 308           *do_handoff = 1;
 309           return NULL;
 310         }
 311       reass = pool_elt_at_index (rt->pool, kv->v.reass_index);
 312
 313       if (now > reass->last_heard + rm->timeout)
 314         {
 315           ip6_sv_reass_free (vm, rm, rt, reass);
 316           reass = NULL;
 317         }
 318     }
 319
 320   if (reass)
 321     {
 322       reass->last_heard = now;
 323       return reass;
 324     }
 325
 326   if (rt->reass_n >= rm->max_reass_n)
 327     {
 328       reass = pool_elt_at_index (rt->pool, rt->lru_last);
 329       ip6_sv_reass_free (vm, rm, rt, reass);
 330     }
 331
 332   pool_get (rt->pool, reass);
 333   clib_memset (reass, 0, sizeof (*reass));
 334   reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 335   ++rt->id_counter;
 336   ip6_sv_reass_init (reass);
 337   ++rt->reass_n;
 338
 339   reass->lru_prev = reass->lru_next = ~0;
 340
 341   if (~0 != rt->lru_last)
 342     {
 343       ip6_sv_reass_t *lru_last = pool_elt_at_index (rt->pool, rt->lru_last);
 344       reass->lru_prev = rt->lru_last;
 345       lru_last->lru_next = rt->lru_last = reass - rt->pool;
 346     }
 347
 348   if (~0 == rt->lru_first)
 349     {
 350       rt->lru_first = rt->lru_last = reass - rt->pool;
 351     }
 352
 353   reass->key.as_u64[0] = ((clib_bihash_kv_48_8_t *) kv)->key[0];
 354   reass->key.as_u64[1] = ((clib_bihash_kv_48_8_t *) kv)->key[1];
 355   reass->key.as_u64[2] = ((clib_bihash_kv_48_8_t *) kv)->key[2];
 356   reass->key.as_u64[3] = ((clib_bihash_kv_48_8_t *) kv)->key[3];
 357   reass->key.as_u64[4] = ((clib_bihash_kv_48_8_t *) kv)->key[4];
 358   reass->key.as_u64[5] = ((clib_bihash_kv_48_8_t *) kv)->key[5];
 359   kv->v.reass_index = (reass - rt->pool);
 360   kv->v.thread_index = vm->thread_index;
 361   reass->last_heard = now;
 362
 363   if (clib_bihash_add_del_48_8 (&rm->hash, (clib_bihash_kv_48_8_t *) kv, 1))
 364     {
 365       ip6_sv_reass_free (vm, rm, rt, reass);
 366       reass = NULL;
 367     }
 368
 369   return reass;
 370 }
 371
 372 always_inline ip6_sv_reass_rc_t
 373 ip6_sv_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 374                      ip6_sv_reass_main_t * rm, ip6_sv_reass_per_thread_t * rt,
 375                      ip6_sv_reass_t * reass, u32 bi0,
 376                      ip6_frag_hdr_t * frag_hdr)
 377 {
 378   vlib_buffer_t *fb = vlib_get_buffer (vm, bi0);
 379   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 380   fvnb->ip.reass.ip6_frag_hdr_offset =
 381     (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
 382   ip6_header_t *fip = vlib_buffer_get_current (fb);
 383   if (fb->current_length < sizeof (*fip) ||
 384       fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
 385       fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
 386     {
 387       return IP6_SV_REASS_RC_INTERNAL_ERROR;
 388     }
 389
 390   u32 fragment_first = fvnb->ip.reass.fragment_first =
 391     ip6_frag_hdr_offset_bytes (frag_hdr);
 392   u32 fragment_length =
 393     vlib_buffer_length_in_chain (vm, fb) -
 394     (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 395   u32 fragment_last = fvnb->ip.reass.fragment_last =
 396     fragment_first + fragment_length - 1;
 397   fvnb->ip.reass.range_first = fragment_first;
 398   fvnb->ip.reass.range_last = fragment_last;
 399   fvnb->ip.reass.next_range_bi = ~0;
 400   if (0 == fragment_first)
 401     {
 402       ip6_ext_header_t *ext_hdr = (void *) frag_hdr;
 403       while (ip6_ext_hdr (ext_hdr->next_hdr)
 404              && vlib_object_within_buffer_data (vm, fb, ext_hdr,
 405                                                 ext_hdr->n_data_u64s * 8))
 406         {
 407           ext_hdr = ip6_ext_next_header (ext_hdr);
 408         }
 409       reass->ip_proto = ext_hdr->next_hdr;
 410       reass->l4_src_port = ip6_get_port (fip, 1, fb->current_length);
 411       reass->l4_dst_port = ip6_get_port (fip, 0, fb->current_length);
 412       if (!reass->l4_src_port || !reass->l4_dst_port)
 413         return IP6_SV_REASS_RC_UNSUPP_IP_PROTO;
 414       reass->is_complete = true;
 415       vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
 416       if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 417         {
 418           ip6_sv_reass_add_trace (vm, node, rm, reass, bi0, REASS_FINISH,
 419                                   reass->ip_proto, reass->l4_src_port,
 420                                   reass->l4_dst_port);
 421         }
 422     }
 423   vec_add1 (reass->cached_buffers, bi0);
 424   if (!reass->is_complete)
 425     {
 426       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 427         {
 428           ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
 429                                   REASS_FRAGMENT_CACHE, reass->ip_proto,
 430                                   reass->l4_src_port, reass->l4_dst_port);
 431         }
 432       if (vec_len (reass->cached_buffers) > rm->max_reass_len)
 433         {
 434           return IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS;
 435         }
 436     }
 437   return IP6_SV_REASS_RC_OK;
 438 }
 439
 440 always_inline bool
 441 ip6_sv_reass_verify_upper_layer_present (vlib_node_runtime_t * node,
 442                                          vlib_buffer_t * b,
 443                                          ip6_frag_hdr_t * frag_hdr)
 444 {
 445   ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr;
 446   while (ip6_ext_hdr (tmp->next_hdr))
 447     {
 448       tmp = ip6_ext_next_header (tmp);
 449     }
 450   if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr)
 451     {
 452       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 453                                    ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
 454                                    0);
 455       b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
 456
 457       return false;
 458     }
 459   return true;
 460 }
 461
 462 always_inline bool
 463 ip6_sv_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
 464                                          vlib_node_runtime_t * node,
 465                                          vlib_buffer_t * b,
 466                                          ip6_frag_hdr_t * frag_hdr)
 467 {
 468   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 469   ip6_header_t *ip = vlib_buffer_get_current (b);
 470   int more_fragments = ip6_frag_hdr_more (frag_hdr);
 471   u32 fragment_length =
 472     vlib_buffer_length_in_chain (vm, b) -
 473     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 474   if (more_fragments && 0 != fragment_length % 8)
 475     {
 476       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 477                                    ICMP6_parameter_problem_erroneous_header_field,
 478                                    (u8 *) & ip->payload_length - (u8 *) ip);
 479       return false;
 480     }
 481   return true;
 482 }
 483
 484 always_inline bool
 485 ip6_sv_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
 486                                         vlib_node_runtime_t * node,
 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           u32 icmp_bi = ~0;
 532
 533           bi0 = from[0];
 534           b0 = vlib_get_buffer (vm, bi0);
 535
 536           ip6_header_t *ip0 = vlib_buffer_get_current (b0);
 537           ip6_frag_hdr_t *frag_hdr = NULL;
 538           ip6_ext_header_t *prev_hdr;
 539           if (ip6_ext_hdr (ip0->protocol))
 540             {
 541               frag_hdr =
 542                 ip6_ext_header_find (vm, b0, ip0,
 543                                      IP_PROTOCOL_IPV6_FRAGMENTATION,
 544                                      &prev_hdr);
 545             }
 546           if (!frag_hdr)
 547             {
 548               // this is a regular packet - no fragmentation
 549               vnet_buffer (b0)->ip.reass.ip_proto = ip0->protocol;
 550               vnet_buffer (b0)->ip.reass.l4_src_port =
 551                 ip6_get_port (ip0, 1, b0->current_length);
 552               vnet_buffer (b0)->ip.reass.l4_dst_port =
 553                 ip6_get_port (ip0, 0, b0->current_length);
 554               next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
 555               goto packet_enqueue;
 556             }
 557           if (0 == ip6_frag_hdr_offset (frag_hdr))
 558             {
 559               // first fragment - verify upper-layer is present
 560               if (!ip6_sv_reass_verify_upper_layer_present
 561                   (node, b0, frag_hdr))
 562                 {
 563                   next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 564                   goto packet_enqueue;
 565                 }
 566             }
 567           if (!ip6_sv_reass_verify_fragment_multiple_8
 568               (vm, node, b0, frag_hdr)
 569               || !ip6_sv_reass_verify_packet_size_lt_64k (vm, node, b0,
 570                                                           frag_hdr))
 571             {
 572               next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 573               goto packet_enqueue;
 574             }
 575           vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
 576             (u8 *) frag_hdr - (u8 *) ip0;
 577
 578           ip6_sv_reass_kv_t kv;
 579           u8 do_handoff = 0;
 580
 581           kv.k.as_u64[0] = ip0->src_address.as_u64[0];
 582           kv.k.as_u64[1] = ip0->src_address.as_u64[1];
 583           kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
 584           kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
 585           kv.k.as_u64[4] =
 586             ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
 587                             vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
 588             (u64) frag_hdr->identification;
 589           kv.k.as_u64[5] = ip0->protocol;
 590
 591           ip6_sv_reass_t *reass =
 592             ip6_sv_reass_find_or_create (vm, node, rm, rt, &kv, &icmp_bi,
 593                                          &do_handoff);
 594
 595           if (PREDICT_FALSE (do_handoff))
 596             {
 597               next0 = IP6_SV_REASSEMBLY_NEXT_HANDOFF;
 598               vnet_buffer (b0)->ip.reass.owner_thread_index =
 599                 kv.v.thread_index;
 600             }
 601
 602           if (!reass)
 603             {
 604               next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 605               error0 = IP6_ERROR_REASS_LIMIT_REACHED;
 606               goto packet_enqueue;
 607             }
 608
 609           if (reass->is_complete)
 610             {
 611               vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 612               vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 613               vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 614               next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
 615               error0 = IP6_ERROR_NONE;
 616               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 617                 {
 618                   ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
 619                                           REASS_FRAGMENT_FORWARD,
 620                                           reass->ip_proto,
 621                                           reass->l4_src_port,
 622                                           reass->l4_dst_port);
 623                 }
 624               goto packet_enqueue;
 625             }
 626
 627           switch (ip6_sv_reass_update
 628                   (vm, node, rm, rt, reass, bi0, frag_hdr))
 629             {
 630             case IP6_SV_REASS_RC_OK:
 631               /* nothing to do here */
 632               break;
 633             case IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS:
 634               vlib_node_increment_counter (vm, node->node_index,
 635                                            IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
 636                                            1);
 637               ip6_sv_reass_free (vm, rm, rt, reass);
 638               goto next_packet;
 639               break;
 640             case IP6_SV_REASS_RC_UNSUPP_IP_PROTO:
 641               vlib_node_increment_counter (vm, node->node_index,
 642                                            IP6_ERROR_REASS_UNSUPP_IP_PROTO,
 643                                            1);
 644               ip6_sv_reass_free (vm, rm, rt, reass);
 645               goto next_packet;
 646               break;
 647             case IP6_SV_REASS_RC_INTERNAL_ERROR:
 648               vlib_node_increment_counter (vm, node->node_index,
 649                                            IP6_ERROR_REASS_INTERNAL_ERROR, 1);
 650               ip6_sv_reass_free (vm, rm, rt, reass);
 651               goto next_packet;
 652               break;
 653             }
 654
 655           b0->error = node->errors[error0];
 656
 657           if (reass->is_complete)
 658             {
 659               u32 idx;
 660               vec_foreach_index (idx, reass->cached_buffers)
 661               {
 662                 u32 bi0 = vec_elt (reass->cached_buffers, idx);
 663                 if (0 == n_left_to_next)
 664                   {
 665                     vlib_put_next_frame (vm, node, next_index,
 666                                          n_left_to_next);
 667                     vlib_get_next_frame (vm, node, next_index, to_next,
 668                                          n_left_to_next);
 669                   }
 670                 to_next[0] = bi0;
 671                 to_next += 1;
 672                 n_left_to_next -= 1;
 673                 b0 = vlib_get_buffer (vm, bi0);
 674                 if (is_feature)
 675                   {
 676                     vnet_feature_next (&next0, b0);
 677                   }
 678                 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 679                 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 680                 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 681                 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 682                   {
 683                     ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
 684                                             REASS_FRAGMENT_FORWARD,
 685                                             reass->ip_proto,
 686                                             reass->l4_src_port,
 687                                             reass->l4_dst_port);
 688                   }
 689                 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 690                                                  to_next, n_left_to_next, bi0,
 691                                                  next0);
 692               }
 693               _vec_len (reass->cached_buffers) = 0;     // buffers are owned by frame now
 694             }
 695           goto next_packet;
 696
 697         packet_enqueue:
 698           to_next[0] = bi0;
 699           to_next += 1;
 700           n_left_to_next -= 1;
 701           if (is_feature && IP6_ERROR_NONE == error0)
 702             {
 703               b0 = vlib_get_buffer (vm, bi0);
 704               vnet_feature_next (&next0, b0);
 705             }
 706           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 707                                            n_left_to_next, bi0, next0);
 708
 709           if (~0 != icmp_bi)
 710             {
 711               next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 712               to_next[0] = icmp_bi;
 713               to_next += 1;
 714               n_left_to_next -= 1;
 715               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 716                                                n_left_to_next, icmp_bi,
 717                                                next0);
 718             }
 719
 720         next_packet:
 721           from += 1;
 722           n_left_from -= 1;
 723         }
 724
 725       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 726     }
 727
 728   clib_spinlock_unlock (&rt->lock);
 729   return frame->n_vectors;
 730 }
 731
 732 static char *ip6_sv_reassembly_error_strings[] = {
 733 #define _(sym, string) string,
 734   foreach_ip6_error
 735 #undef _
 736 };
 737
 738 VLIB_NODE_FN (ip6_sv_reass_node) (vlib_main_t * vm,
 739                                   vlib_node_runtime_t * node,
 740                                   vlib_frame_t * frame)
 741 {
 742   return ip6_sv_reassembly_inline (vm, node, frame, false /* is_feature */ );
 743 }
 744
 745 /* *INDENT-OFF* */
 746 VLIB_REGISTER_NODE (ip6_sv_reass_node) = {
 747     .name = "ip6-sv-reassembly",
 748     .vector_size = sizeof (u32),
 749     .format_trace = format_ip6_sv_reass_trace,
 750     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
 751     .error_strings = ip6_sv_reassembly_error_strings,
 752     .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
 753     .next_nodes =
 754         {
 755                 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
 756                 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
 757                 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
 758                 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reassembly-handoff",
 759         },
 760 };
 761 /* *INDENT-ON* */
 762
 763 VLIB_NODE_FN (ip6_sv_reass_node_feature) (vlib_main_t * vm,
 764                                           vlib_node_runtime_t * node,
 765                                           vlib_frame_t * frame)
 766 {
 767   return ip6_sv_reassembly_inline (vm, node, frame, true /* is_feature */ );
 768 }
 769
 770 /* *INDENT-OFF* */
 771 VLIB_REGISTER_NODE (ip6_sv_reass_node_feature) = {
 772     .name = "ip6-sv-reassembly-feature",
 773     .vector_size = sizeof (u32),
 774     .format_trace = format_ip6_sv_reass_trace,
 775     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
 776     .error_strings = ip6_sv_reassembly_error_strings,
 777     .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
 778     .next_nodes =
 779         {
 780                 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
 781                 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
 782                 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
 783                 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reass-feature-hoff",
 784         },
 785 };
 786 /* *INDENT-ON* */
 787
 788 /* *INDENT-OFF* */
 789 VNET_FEATURE_INIT (ip6_sv_reassembly_feature) = {
 790     .arc_name = "ip6-unicast",
 791     .node_name = "ip6-sv-reassembly-feature",
 792     .runs_before = VNET_FEATURES ("ip6-lookup"),
 793     .runs_after = 0,
 794 };
 795 /* *INDENT-ON* */
 796
 797 #ifndef CLIB_MARCH_VARIANT
 798 static u32
 799 ip6_sv_reass_get_nbuckets ()
 800 {
 801   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 802   u32 nbuckets;
 803   u8 i;
 804
 805   nbuckets = (u32) (rm->max_reass_n / IP6_SV_REASS_HT_LOAD_FACTOR);
 806
 807   for (i = 0; i < 31; i++)
 808     if ((1 << i) >= nbuckets)
 809       break;
 810   nbuckets = 1 << i;
 811
 812   return nbuckets;
 813 }
 814 #endif /* CLIB_MARCH_VARIANT */
 815
 816 typedef enum
 817 {
 818   IP6_EVENT_CONFIG_CHANGED = 1,
 819 } ip6_sv_reass_event_t;
 820
 821 #ifndef CLIB_MARCH_VARIANT
 822 typedef struct
 823 {
 824   int failure;
 825   clib_bihash_48_8_t *new_hash;
 826 } ip6_rehash_cb_ctx;
 827
 828 static void
 829 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
 830 {
 831   ip6_rehash_cb_ctx *ctx = _ctx;
 832   if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
 833     {
 834       ctx->failure = 1;
 835     }
 836 }
 837
 838 static void
 839 ip6_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
 840                          u32 max_reassembly_length,
 841                          u32 expire_walk_interval_ms)
 842 {
 843   ip6_sv_reass_main.timeout_ms = timeout_ms;
 844   ip6_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
 845   ip6_sv_reass_main.max_reass_n = max_reassemblies;
 846   ip6_sv_reass_main.max_reass_len = max_reassembly_length;
 847   ip6_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
 848 }
 849
 850 vnet_api_error_t
 851 ip6_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
 852                   u32 max_reassembly_length, u32 expire_walk_interval_ms)
 853 {
 854   u32 old_nbuckets = ip6_sv_reass_get_nbuckets ();
 855   ip6_sv_reass_set_params (timeout_ms, max_reassemblies,
 856                            max_reassembly_length, expire_walk_interval_ms);
 857   vlib_process_signal_event (ip6_sv_reass_main.vlib_main,
 858                              ip6_sv_reass_main.ip6_sv_reass_expire_node_idx,
 859                              IP6_EVENT_CONFIG_CHANGED, 0);
 860   u32 new_nbuckets = ip6_sv_reass_get_nbuckets ();
 861   if (ip6_sv_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
 862     {
 863       clib_bihash_48_8_t new_hash;
 864       clib_memset (&new_hash, 0, sizeof (new_hash));
 865       ip6_rehash_cb_ctx ctx;
 866       ctx.failure = 0;
 867       ctx.new_hash = &new_hash;
 868       clib_bihash_init_48_8 (&new_hash, "ip6-sv-reass", new_nbuckets,
 869                              new_nbuckets * 1024);
 870       clib_bihash_foreach_key_value_pair_48_8 (&ip6_sv_reass_main.hash,
 871                                                ip6_rehash_cb, &ctx);
 872       if (ctx.failure)
 873         {
 874           clib_bihash_free_48_8 (&new_hash);
 875           return -1;
 876         }
 877       else
 878         {
 879           clib_bihash_free_48_8 (&ip6_sv_reass_main.hash);
 880           clib_memcpy_fast (&ip6_sv_reass_main.hash, &new_hash,
 881                             sizeof (ip6_sv_reass_main.hash));
 882           clib_bihash_copied (&ip6_sv_reass_main.hash, &new_hash);
 883         }
 884     }
 885   return 0;
 886 }
 887
 888 vnet_api_error_t
 889 ip6_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
 890                   u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
 891 {
 892   *timeout_ms = ip6_sv_reass_main.timeout_ms;
 893   *max_reassemblies = ip6_sv_reass_main.max_reass_n;
 894   *max_reassembly_length = ip6_sv_reass_main.max_reass_len;
 895   *expire_walk_interval_ms = ip6_sv_reass_main.expire_walk_interval_ms;
 896   return 0;
 897 }
 898
 899 static clib_error_t *
 900 ip6_sv_reass_init_function (vlib_main_t * vm)
 901 {
 902   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 903   clib_error_t *error = 0;
 904   u32 nbuckets;
 905   vlib_node_t *node;
 906
 907   rm->vlib_main = vm;
 908   rm->vnet_main = vnet_get_main ();
 909
 910   vec_validate (rm->per_thread_data, vlib_num_workers ());
 911   ip6_sv_reass_per_thread_t *rt;
 912   vec_foreach (rt, rm->per_thread_data)
 913   {
 914     clib_spinlock_init (&rt->lock);
 915     pool_alloc (rt->pool, rm->max_reass_n);
 916     rt->lru_first = rt->lru_last = ~0;
 917   }
 918
 919   node = vlib_get_node_by_name (vm, (u8 *) "ip6-sv-reassembly-expire-walk");
 920   ASSERT (node);
 921   rm->ip6_sv_reass_expire_node_idx = node->index;
 922
 923   ip6_sv_reass_set_params (IP6_SV_REASS_TIMEOUT_DEFAULT_MS,
 924                            IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
 925                            IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
 926                            IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
 927
 928   nbuckets = ip6_sv_reass_get_nbuckets ();
 929   clib_bihash_init_48_8 (&rm->hash, "ip6-sv-reass", nbuckets,
 930                          nbuckets * 1024);
 931
 932   node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
 933   ASSERT (node);
 934   rm->ip6_drop_idx = node->index;
 935   node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
 936   ASSERT (node);
 937   rm->ip6_icmp_error_idx = node->index;
 938
 939   if ((error = vlib_call_init_function (vm, ip_main_init)))
 940     return error;
 941   ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
 942                          ip6_sv_reass_node.index);
 943
 944   rm->fq_index = vlib_frame_queue_main_init (ip6_sv_reass_node.index, 0);
 945   rm->fq_feature_index =
 946     vlib_frame_queue_main_init (ip6_sv_reass_node_feature.index, 0);
 947
 948   return error;
 949 }
 950
 951 VLIB_INIT_FUNCTION (ip6_sv_reass_init_function);
 952 #endif /* CLIB_MARCH_VARIANT */
 953
 954 static uword
 955 ip6_sv_reass_walk_expired (vlib_main_t * vm,
 956                            vlib_node_runtime_t * node, vlib_frame_t * f)
 957 {
 958   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 959   uword event_type, *event_data = 0;
 960
 961   while (true)
 962     {
 963       vlib_process_wait_for_event_or_clock (vm,
 964                                             (f64) rm->expire_walk_interval_ms
 965                                             / (f64) MSEC_PER_SEC);
 966       event_type = vlib_process_get_events (vm, &event_data);
 967
 968       switch (event_type)
 969         {
 970         case ~0:                /* no events => timeout */
 971           /* nothing to do here */
 972           break;
 973         case IP6_EVENT_CONFIG_CHANGED:
 974           break;
 975         default:
 976           clib_warning ("BUG: event type 0x%wx", event_type);
 977           break;
 978         }
 979       f64 now = vlib_time_now (vm);
 980
 981       ip6_sv_reass_t *reass;
 982       int *pool_indexes_to_free = NULL;
 983
 984       uword thread_index = 0;
 985       int index;
 986       const uword nthreads = vlib_num_workers () + 1;
 987       u32 *vec_icmp_bi = NULL;
 988       for (thread_index = 0; thread_index < nthreads; ++thread_index)
 989         {
 990           ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
 991           clib_spinlock_lock (&rt->lock);
 992
 993           vec_reset_length (pool_indexes_to_free);
 994           /* *INDENT-OFF* */
 995           pool_foreach_index (index, rt->pool, ({
 996                                 reass = pool_elt_at_index (rt->pool, index);
 997                                 if (now > reass->last_heard + rm->timeout)
 998                                   {
 999                                     vec_add1 (pool_indexes_to_free, index);
1000                                   }
1001                               }));
1002           /* *INDENT-ON* */
1003           int *i;
1004           /* *INDENT-OFF* */
1005           vec_foreach (i, pool_indexes_to_free)
1006           {
1007             ip6_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1008             ip6_sv_reass_free (vm, rm, rt, reass);
1009           }
1010           /* *INDENT-ON* */
1011
1012           clib_spinlock_unlock (&rt->lock);
1013         }
1014
1015       while (vec_len (vec_icmp_bi) > 0)
1016         {
1017           vlib_frame_t *f =
1018             vlib_get_frame_to_node (vm, rm->ip6_icmp_error_idx);
1019           u32 *to_next = vlib_frame_vector_args (f);
1020           u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
1021           int trace_frame = 0;
1022           while (vec_len (vec_icmp_bi) > 0 && n_left_to_next > 0)
1023             {
1024               u32 bi = vec_pop (vec_icmp_bi);
1025               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1026               if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1027                 {
1028                   trace_frame = 1;
1029                 }
1030               b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
1031               to_next[0] = bi;
1032               ++f->n_vectors;
1033               to_next += 1;
1034               n_left_to_next -= 1;
1035             }
1036           f->frame_flags |= (trace_frame * VLIB_FRAME_TRACE);
1037           vlib_put_frame_to_node (vm, rm->ip6_icmp_error_idx, f);
1038         }
1039
1040       vec_free (pool_indexes_to_free);
1041       vec_free (vec_icmp_bi);
1042       if (event_data)
1043         {
1044           _vec_len (event_data) = 0;
1045         }
1046     }
1047
1048   return 0;
1049 }
1050
1051 /* *INDENT-OFF* */
1052 VLIB_REGISTER_NODE (ip6_sv_reass_expire_node) = {
1053     .function = ip6_sv_reass_walk_expired,
1054     .format_trace = format_ip6_sv_reass_trace,
1055     .type = VLIB_NODE_TYPE_PROCESS,
1056     .name = "ip6-sv-reassembly-expire-walk",
1057
1058     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
1059     .error_strings = ip6_sv_reassembly_error_strings,
1060
1061 };
1062 /* *INDENT-ON* */
1063
1064 static u8 *
1065 format_ip6_sv_reass_key (u8 * s, va_list * args)
1066 {
1067   ip6_sv_reass_key_t *key = va_arg (*args, ip6_sv_reass_key_t *);
1068   s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1069               key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1070               &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1071   return s;
1072 }
1073
1074 static u8 *
1075 format_ip6_sv_reass (u8 * s, va_list * args)
1076 {
1077   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1078   ip6_sv_reass_t *reass = va_arg (*args, ip6_sv_reass_t *);
1079
1080   s = format (s, "ID: %lu, key: %U, trace_op_counter: %u\n",
1081               reass->id, format_ip6_sv_reass_key, &reass->key,
1082               reass->trace_op_counter);
1083   vlib_buffer_t *b;
1084   u32 *bip;
1085   u32 counter = 0;
1086   vec_foreach (bip, reass->cached_buffers)
1087   {
1088     u32 bi = *bip;
1089     do
1090       {
1091         b = vlib_get_buffer (vm, bi);
1092         s = format (s, "  #%03u: bi: %u\n", counter, bi);
1093         ++counter;
1094         bi = b->next_buffer;
1095       }
1096     while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1097   }
1098   return s;
1099 }
1100
1101 static clib_error_t *
1102 show_ip6_sv_reass (vlib_main_t * vm, unformat_input_t * input,
1103                    CLIB_UNUSED (vlib_cli_command_t * lmd))
1104 {
1105   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1106
1107   vlib_cli_output (vm, "---------------------");
1108   vlib_cli_output (vm, "IP6 reassembly status");
1109   vlib_cli_output (vm, "---------------------");
1110   bool details = false;
1111   if (unformat (input, "details"))
1112     {
1113       details = true;
1114     }
1115
1116   u32 sum_reass_n = 0;
1117   u64 sum_buffers_n = 0;
1118   ip6_sv_reass_t *reass;
1119   uword thread_index;
1120   const uword nthreads = vlib_num_workers () + 1;
1121   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1122     {
1123       ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1124       clib_spinlock_lock (&rt->lock);
1125       if (details)
1126         {
1127           /* *INDENT-OFF* */
1128           pool_foreach (reass, rt->pool, {
1129             vlib_cli_output (vm, "%U", format_ip6_sv_reass, vm, reass);
1130           });
1131           /* *INDENT-ON* */
1132         }
1133       sum_reass_n += rt->reass_n;
1134       clib_spinlock_unlock (&rt->lock);
1135     }
1136   vlib_cli_output (vm, "---------------------");
1137   vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1138                    (long unsigned) sum_reass_n);
1139   vlib_cli_output (vm, "Maximum configured concurrent IP6 reassemblies per "
1140                    "worker-thread: %lu\n", (long unsigned) rm->max_reass_n);
1141   vlib_cli_output (vm, "Buffers in use: %lu\n",
1142                    (long unsigned) sum_buffers_n);
1143   return 0;
1144 }
1145
1146 /* *INDENT-OFF* */
1147 VLIB_CLI_COMMAND (show_ip6_sv_reassembly_cmd, static) = {
1148     .path = "show ip6-sv-reassembly",
1149     .short_help = "show ip6-sv-reassembly [details]",
1150     .function = show_ip6_sv_reass,
1151 };
1152 /* *INDENT-ON* */
1153
1154 #ifndef CLIB_MARCH_VARIANT
1155 vnet_api_error_t
1156 ip6_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1157 {
1158   return vnet_feature_enable_disable ("ip6-unicast",
1159                                       "ip6-sv-reassembly-feature",
1160                                       sw_if_index, enable_disable, 0, 0);
1161 }
1162 #endif /* CLIB_MARCH_VARIANT */
1163
1164 #define foreach_ip6_sv_reassembly_handoff_error                       \
1165 _(CONGESTION_DROP, "congestion drop")
1166
1167
1168 typedef enum
1169 {
1170 #define _(sym,str) IP6_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
1171   foreach_ip6_sv_reassembly_handoff_error
1172 #undef _
1173     IP6_SV_REASSEMBLY_HANDOFF_N_ERROR,
1174 } ip6_sv_reassembly_handoff_error_t;
1175
1176 static char *ip6_sv_reassembly_handoff_error_strings[] = {
1177 #define _(sym,string) string,
1178   foreach_ip6_sv_reassembly_handoff_error
1179 #undef _
1180 };
1181
1182 typedef struct
1183 {
1184   u32 next_worker_index;
1185 } ip6_sv_reassembly_handoff_trace_t;
1186
1187 static u8 *
1188 format_ip6_sv_reassembly_handoff_trace (u8 * s, va_list * args)
1189 {
1190   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1191   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1192   ip6_sv_reassembly_handoff_trace_t *t =
1193     va_arg (*args, ip6_sv_reassembly_handoff_trace_t *);
1194
1195   s =
1196     format (s, "ip6-sv-reassembly-handoff: next-worker %d",
1197             t->next_worker_index);
1198
1199   return s;
1200 }
1201
1202 always_inline uword
1203 ip6_sv_reassembly_handoff_inline (vlib_main_t * vm,
1204                                   vlib_node_runtime_t * node,
1205                                   vlib_frame_t * frame, bool is_feature)
1206 {
1207   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1208
1209   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1210   u32 n_enq, n_left_from, *from;
1211   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1212   u32 fq_index;
1213
1214   from = vlib_frame_vector_args (frame);
1215   n_left_from = frame->n_vectors;
1216   vlib_get_buffers (vm, from, bufs, n_left_from);
1217
1218   b = bufs;
1219   ti = thread_indices;
1220
1221   fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1222
1223   while (n_left_from > 0)
1224     {
1225       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1226
1227       if (PREDICT_FALSE
1228           ((node->flags & VLIB_NODE_FLAG_TRACE)
1229            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1230         {
1231           ip6_sv_reassembly_handoff_trace_t *t =
1232             vlib_add_trace (vm, node, b[0], sizeof (*t));
1233           t->next_worker_index = ti[0];
1234         }
1235
1236       n_left_from -= 1;
1237       ti += 1;
1238       b += 1;
1239     }
1240   n_enq =
1241     vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1242                                    frame->n_vectors, 1);
1243
1244   if (n_enq < frame->n_vectors)
1245     vlib_node_increment_counter (vm, node->node_index,
1246                                  IP6_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1247                                  frame->n_vectors - n_enq);
1248   return frame->n_vectors;
1249 }
1250
1251 VLIB_NODE_FN (ip6_sv_reassembly_handoff_node) (vlib_main_t * vm,
1252                                                vlib_node_runtime_t * node,
1253                                                vlib_frame_t * frame)
1254 {
1255   return ip6_sv_reassembly_handoff_inline (vm, node, frame,
1256                                            false /* is_feature */ );
1257 }
1258
1259 /* *INDENT-OFF* */
1260 VLIB_REGISTER_NODE (ip6_sv_reassembly_handoff_node) = {
1261   .name = "ip6-sv-reassembly-handoff",
1262   .vector_size = sizeof (u32),
1263   .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1264   .error_strings = ip6_sv_reassembly_handoff_error_strings,
1265   .format_trace = format_ip6_sv_reassembly_handoff_trace,
1266
1267   .n_next_nodes = 1,
1268
1269   .next_nodes = {
1270     [0] = "error-drop",
1271   },
1272 };
1273
1274
1275 VLIB_NODE_FN (ip6_sv_reassembly_feature_handoff_node) (vlib_main_t * vm,
1276                                vlib_node_runtime_t * node, vlib_frame_t * frame)
1277 {
1278   return ip6_sv_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1279 }
1280
1281
1282 /* *INDENT-OFF* */
1283 VLIB_REGISTER_NODE (ip6_sv_reassembly_feature_handoff_node) = {
1284   .name = "ip6-sv-reass-feature-hoff",
1285   .vector_size = sizeof (u32),
1286   .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1287   .error_strings = ip6_sv_reassembly_handoff_error_strings,
1288   .format_trace = format_ip6_sv_reassembly_handoff_trace,
1289
1290   .n_next_nodes = 1,
1291
1292   .next_nodes = {
1293     [0] = "error-drop",
1294   },
1295 };
1296 /* *INDENT-ON* */
1297
1298 #ifndef CLIB_MARCH_VARIANT
1299 int
1300 ip6_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1301 {
1302   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1303   if (is_enable)
1304     {
1305       if (!rm->feature_use_refcount)
1306         {
1307           ++rm->feature_use_refcount;
1308           return vnet_feature_enable_disable ("ip6-unicast",
1309                                               "ip6-sv-reassembly-feature",
1310                                               sw_if_index, 1, 0, 0);
1311         }
1312       ++rm->feature_use_refcount;
1313     }
1314   else
1315     {
1316       --rm->feature_use_refcount;
1317       if (!rm->feature_use_refcount)
1318         return vnet_feature_enable_disable ("ip6-unicast",
1319                                             "ip6-sv-reassembly-feature",
1320                                             sw_if_index, 0, 0, 0);
1321     }
1322   return -1;
1323 }
1324 #endif
1325
1326 /*
1327  * fd.io coding-style-patch-verification: ON
1328  *
1329  * Local Variables:
1330  * eval: (c-set-style "gnu")
1331  * End:
1332  */