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   u8 icmp_type_or_tcp_flags;
 100   u32 tcp_ack_number;
 101   u32 tcp_seq_number;
 102   // l4 src port
 103   u16 l4_src_port;
 104   // l4 dst port
 105   u16 l4_dst_port;
 106   // lru indexes
 107   u32 lru_prev;
 108   u32 lru_next;
 109 } ip6_sv_reass_t;
 110
 111 typedef struct
 112 {
 113   ip6_sv_reass_t *pool;
 114   u32 reass_n;
 115   u32 id_counter;
 116   clib_spinlock_t lock;
 117   // lru indexes
 118   u32 lru_first;
 119   u32 lru_last;
 120 } ip6_sv_reass_per_thread_t;
 121
 122 typedef struct
 123 {
 124   // IPv6 config
 125   u32 timeout_ms;
 126   f64 timeout;
 127   u32 expire_walk_interval_ms;
 128   // maximum number of fragments in one reassembly
 129   u32 max_reass_len;
 130   // maximum number of reassemblies
 131   u32 max_reass_n;
 132
 133   // IPv6 runtime
 134   clib_bihash_48_8_t hash;
 135
 136   // per-thread data
 137   ip6_sv_reass_per_thread_t *per_thread_data;
 138
 139   // convenience
 140   vlib_main_t *vlib_main;
 141   vnet_main_t *vnet_main;
 142
 143   // node index of ip6-drop node
 144   u32 ip6_drop_idx;
 145   u32 ip6_icmp_error_idx;
 146   u32 ip6_sv_reass_expire_node_idx;
 147
 148   /** Worker handoff */
 149   u32 fq_index;
 150   u32 fq_feature_index;
 151
 152   // reference count for enabling/disabling feature - per interface
 153   u32 *feature_use_refcount_per_intf;
 154 } ip6_sv_reass_main_t;
 155
 156 extern ip6_sv_reass_main_t ip6_sv_reass_main;
 157
 158 #ifndef CLIB_MARCH_VARIANT
 159 ip6_sv_reass_main_t ip6_sv_reass_main;
 160 #endif /* CLIB_MARCH_VARIANT */
 161
 162 typedef enum
 163 {
 164   IP6_SV_REASSEMBLY_NEXT_INPUT,
 165   IP6_SV_REASSEMBLY_NEXT_DROP,
 166   IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR,
 167   IP6_SV_REASSEMBLY_NEXT_HANDOFF,
 168   IP6_SV_REASSEMBLY_N_NEXT,
 169 } ip6_sv_reass_next_t;
 170
 171 typedef enum
 172 {
 173   REASS_FRAGMENT_CACHE,
 174   REASS_FINISH,
 175   REASS_FRAGMENT_FORWARD,
 176   REASS_PASSTHROUGH,
 177 } ip6_sv_reass_trace_operation_e;
 178
 179 typedef struct
 180 {
 181   ip6_sv_reass_trace_operation_e action;
 182   u32 reass_id;
 183   u32 op_id;
 184   u8 ip_proto;
 185   u16 l4_src_port;
 186   u16 l4_dst_port;
 187 } ip6_sv_reass_trace_t;
 188
 189 static u8 *
 190 format_ip6_sv_reass_trace (u8 * s, va_list * args)
 191 {
 192   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 193   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 194   ip6_sv_reass_trace_t *t = va_arg (*args, ip6_sv_reass_trace_t *);
 195   if (REASS_PASSTHROUGH != t->action)
 196     {
 197       s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
 198     }
 199   switch (t->action)
 200     {
 201     case REASS_FRAGMENT_CACHE:
 202       s = format (s, "[cached]");
 203       break;
 204     case REASS_FINISH:
 205       s =
 206         format (s, "[finish, ip proto=%u, src_port=%u, dst_port=%u]",
 207                 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
 208                 clib_net_to_host_u16 (t->l4_dst_port));
 209       break;
 210     case REASS_FRAGMENT_FORWARD:
 211       s =
 212         format (s, "[forward, ip proto=%u, src_port=%u, dst_port=%u]",
 213                 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
 214                 clib_net_to_host_u16 (t->l4_dst_port));
 215       break;
 216     case REASS_PASSTHROUGH:
 217       s = format (s, "[not-fragmented]");
 218       break;
 219     }
 220   return s;
 221 }
 222
 223 static void
 224 ip6_sv_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 225                         ip6_sv_reass_main_t * rm,
 226                         ip6_sv_reass_t * reass, u32 bi,
 227                         ip6_sv_reass_trace_operation_e action,
 228                         u32 ip_proto, u16 l4_src_port, u16 l4_dst_port)
 229 {
 230   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 231   ip6_sv_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 232   if (reass)
 233     {
 234       t->reass_id = reass->id;
 235       t->op_id = reass->trace_op_counter;
 236       ++reass->trace_op_counter;
 237     }
 238   t->action = action;
 239   t->ip_proto = ip_proto;
 240   t->l4_src_port = l4_src_port;
 241   t->l4_dst_port = l4_dst_port;
 242 #if 0
 243   static u8 *s = NULL;
 244   s = format (s, "%U", format_ip6_sv_reass_trace, NULL, NULL, t);
 245   printf ("%.*s\n", vec_len (s), s);
 246   fflush (stdout);
 247   vec_reset_length (s);
 248 #endif
 249 }
 250
 251 always_inline void
 252 ip6_sv_reass_free (vlib_main_t * vm, ip6_sv_reass_main_t * rm,
 253                    ip6_sv_reass_per_thread_t * rt, ip6_sv_reass_t * reass)
 254 {
 255   clib_bihash_kv_48_8_t kv;
 256   kv.key[0] = reass->key.as_u64[0];
 257   kv.key[1] = reass->key.as_u64[1];
 258   kv.key[2] = reass->key.as_u64[2];
 259   kv.key[3] = reass->key.as_u64[3];
 260   kv.key[4] = reass->key.as_u64[4];
 261   kv.key[5] = reass->key.as_u64[5];
 262   clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
 263   vlib_buffer_free (vm, reass->cached_buffers,
 264                     vec_len (reass->cached_buffers));
 265   vec_free (reass->cached_buffers);
 266   reass->cached_buffers = NULL;
 267   if (~0 != reass->lru_prev)
 268     {
 269       ip6_sv_reass_t *lru_prev =
 270         pool_elt_at_index (rt->pool, reass->lru_prev);
 271       lru_prev->lru_next = reass->lru_next;
 272     }
 273   if (~0 != reass->lru_next)
 274     {
 275       ip6_sv_reass_t *lru_next =
 276         pool_elt_at_index (rt->pool, reass->lru_next);
 277       lru_next->lru_prev = reass->lru_prev;
 278     }
 279   if (rt->lru_first == reass - rt->pool)
 280     {
 281       rt->lru_first = reass->lru_next;
 282     }
 283   if (rt->lru_last == reass - rt->pool)
 284     {
 285       rt->lru_last = reass->lru_prev;
 286     }
 287   pool_put (rt->pool, reass);
 288   --rt->reass_n;
 289 }
 290
 291 always_inline void
 292 ip6_sv_reass_init (ip6_sv_reass_t * reass)
 293 {
 294   reass->cached_buffers = NULL;
 295   reass->is_complete = false;
 296 }
 297
 298 always_inline ip6_sv_reass_t *
 299 ip6_sv_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
 300                              ip6_sv_reass_main_t * rm,
 301                              ip6_sv_reass_per_thread_t * rt,
 302                              ip6_sv_reass_kv_t * kv, u32 * icmp_bi,
 303                              u8 * do_handoff)
 304 {
 305   ip6_sv_reass_t *reass = NULL;
 306   f64 now = vlib_time_now (vm);
 307
 308   if (!clib_bihash_search_48_8 (&rm->hash, &kv->kv, &kv->kv))
 309     {
 310       if (vm->thread_index != kv->v.thread_index)
 311         {
 312           *do_handoff = 1;
 313           return NULL;
 314         }
 315       reass = pool_elt_at_index (rt->pool, kv->v.reass_index);
 316
 317       if (now > reass->last_heard + rm->timeout)
 318         {
 319           ip6_sv_reass_free (vm, rm, rt, reass);
 320           reass = NULL;
 321         }
 322     }
 323
 324   if (reass)
 325     {
 326       reass->last_heard = now;
 327       return reass;
 328     }
 329
 330   if (rt->reass_n >= rm->max_reass_n)
 331     {
 332       reass = pool_elt_at_index (rt->pool, rt->lru_first);
 333       ip6_sv_reass_free (vm, rm, rt, reass);
 334     }
 335
 336   pool_get (rt->pool, reass);
 337   clib_memset (reass, 0, sizeof (*reass));
 338   reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 339   ++rt->id_counter;
 340   ip6_sv_reass_init (reass);
 341   ++rt->reass_n;
 342
 343   reass->lru_prev = reass->lru_next = ~0;
 344
 345   if (~0 != rt->lru_last)
 346     {
 347       ip6_sv_reass_t *lru_last = pool_elt_at_index (rt->pool, rt->lru_last);
 348       reass->lru_prev = rt->lru_last;
 349       lru_last->lru_next = rt->lru_last = reass - rt->pool;
 350     }
 351
 352   if (~0 == rt->lru_first)
 353     {
 354       rt->lru_first = rt->lru_last = reass - rt->pool;
 355     }
 356
 357   reass->key.as_u64[0] = kv->kv.key[0];
 358   reass->key.as_u64[1] = kv->kv.key[1];
 359   reass->key.as_u64[2] = kv->kv.key[2];
 360   reass->key.as_u64[3] = kv->kv.key[3];
 361   reass->key.as_u64[4] = kv->kv.key[4];
 362   reass->key.as_u64[5] = kv->kv.key[5];
 363   kv->v.reass_index = (reass - rt->pool);
 364   kv->v.thread_index = vm->thread_index;
 365   reass->last_heard = now;
 366
 367   if (clib_bihash_add_del_48_8 (&rm->hash, &kv->kv, 1))
 368     {
 369       ip6_sv_reass_free (vm, rm, rt, reass);
 370       reass = NULL;
 371     }
 372
 373   return reass;
 374 }
 375
 376 always_inline ip6_sv_reass_rc_t
 377 ip6_sv_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 378                      ip6_sv_reass_main_t * rm, ip6_sv_reass_per_thread_t * rt,
 379                      ip6_sv_reass_t * reass, u32 bi0,
 380                      ip6_frag_hdr_t * frag_hdr)
 381 {
 382   vlib_buffer_t *fb = vlib_get_buffer (vm, bi0);
 383   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 384   fvnb->ip.reass.ip6_frag_hdr_offset =
 385     (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
 386   ip6_header_t *fip = vlib_buffer_get_current (fb);
 387   if (fb->current_length < sizeof (*fip) ||
 388       fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
 389       fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
 390     {
 391       return IP6_SV_REASS_RC_INTERNAL_ERROR;
 392     }
 393
 394   u32 fragment_first = fvnb->ip.reass.fragment_first =
 395     ip6_frag_hdr_offset_bytes (frag_hdr);
 396   u32 fragment_length =
 397     vlib_buffer_length_in_chain (vm, fb) -
 398     (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 399   u32 fragment_last = fvnb->ip.reass.fragment_last =
 400     fragment_first + fragment_length - 1;
 401   fvnb->ip.reass.range_first = fragment_first;
 402   fvnb->ip.reass.range_last = fragment_last;
 403   fvnb->ip.reass.next_range_bi = ~0;
 404   if (0 == fragment_first)
 405     {
 406       if (!ip6_get_port
 407           (vm, fb, fip, fb->current_length, &reass->ip_proto,
 408            &reass->l4_src_port, &reass->l4_dst_port,
 409            &reass->icmp_type_or_tcp_flags, &reass->tcp_ack_number,
 410            &reass->tcp_seq_number))
 411         return IP6_SV_REASS_RC_UNSUPP_IP_PROTO;
 412
 413       reass->is_complete = true;
 414       vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
 415       if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 416         {
 417           ip6_sv_reass_add_trace (vm, node, rm, reass, bi0, REASS_FINISH,
 418                                   reass->ip_proto, reass->l4_src_port,
 419                                   reass->l4_dst_port);
 420         }
 421     }
 422   vec_add1 (reass->cached_buffers, bi0);
 423   if (!reass->is_complete)
 424     {
 425       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 426         {
 427           ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
 428                                   REASS_FRAGMENT_CACHE, reass->ip_proto,
 429                                   reass->l4_src_port, reass->l4_dst_port);
 430         }
 431       if (vec_len (reass->cached_buffers) > rm->max_reass_len)
 432         {
 433           return IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS;
 434         }
 435     }
 436   return IP6_SV_REASS_RC_OK;
 437 }
 438
 439 always_inline bool
 440 ip6_sv_reass_verify_upper_layer_present (vlib_node_runtime_t * node,
 441                                          vlib_buffer_t * b,
 442                                          ip6_frag_hdr_t * frag_hdr)
 443 {
 444   ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr;
 445   while (ip6_ext_hdr (tmp->next_hdr))
 446     {
 447       tmp = ip6_ext_next_header (tmp);
 448     }
 449   if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr)
 450     {
 451       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 452                                    ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
 453                                    0);
 454       b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
 455
 456       return false;
 457     }
 458   return true;
 459 }
 460
 461 always_inline bool
 462 ip6_sv_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
 463                                          vlib_node_runtime_t * node,
 464                                          vlib_buffer_t * b,
 465                                          ip6_frag_hdr_t * frag_hdr)
 466 {
 467   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 468   ip6_header_t *ip = vlib_buffer_get_current (b);
 469   int more_fragments = ip6_frag_hdr_more (frag_hdr);
 470   u32 fragment_length =
 471     vlib_buffer_length_in_chain (vm, b) -
 472     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 473   if (more_fragments && 0 != fragment_length % 8)
 474     {
 475       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 476                                    ICMP6_parameter_problem_erroneous_header_field,
 477                                    (u8 *) & ip->payload_length - (u8 *) ip);
 478       return false;
 479     }
 480   return true;
 481 }
 482
 483 always_inline bool
 484 ip6_sv_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
 485                                         vlib_node_runtime_t * node,
 486                                         vlib_buffer_t * b,
 487                                         ip6_frag_hdr_t * frag_hdr)
 488 {
 489   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 490   u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
 491   u32 fragment_length =
 492     vlib_buffer_length_in_chain (vm, b) -
 493     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 494   if (fragment_first + fragment_length > 65535)
 495     {
 496       ip6_header_t *ip0 = vlib_buffer_get_current (b);
 497       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 498                                    ICMP6_parameter_problem_erroneous_header_field,
 499                                    (u8 *) & frag_hdr->fragment_offset_and_more
 500                                    - (u8 *) ip0);
 501       return false;
 502     }
 503   return true;
 504 }
 505
 506 always_inline uword
 507 ip6_sv_reassembly_inline (vlib_main_t * vm,
 508                           vlib_node_runtime_t * node,
 509                           vlib_frame_t * frame, bool is_feature)
 510 {
 511   u32 *from = vlib_frame_vector_args (frame);
 512   u32 n_left_from, n_left_to_next, *to_next, next_index;
 513   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 514   ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
 515   clib_spinlock_lock (&rt->lock);
 516
 517   n_left_from = frame->n_vectors;
 518   next_index = node->cached_next_index;
 519
 520   while (n_left_from > 0)
 521     {
 522       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 523
 524       while (n_left_from > 0 && n_left_to_next > 0)
 525         {
 526           u32 bi0;
 527           vlib_buffer_t *b0;
 528           u32 next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 529           u32 error0 = IP6_ERROR_NONE;
 530           u32 icmp_bi = ~0;
 531
 532           bi0 = from[0];
 533           b0 = vlib_get_buffer (vm, bi0);
 534
 535           ip6_header_t *ip0 = vlib_buffer_get_current (b0);
 536           ip6_frag_hdr_t *frag_hdr = NULL;
 537           ip6_ext_header_t *prev_hdr;
 538           if (ip6_ext_hdr (ip0->protocol))
 539             {
 540               frag_hdr =
 541                 ip6_ext_header_find (vm, b0, ip0,
 542                                      IP_PROTOCOL_IPV6_FRAGMENTATION,
 543                                      &prev_hdr);
 544             }
 545           if (!frag_hdr)
 546             {
 547               // this is a regular packet - no fragmentation
 548               if (!ip6_get_port
 549                   (vm, b0, ip0, b0->current_length,
 550                    &(vnet_buffer (b0)->ip.reass.ip_proto),
 551                    &(vnet_buffer (b0)->ip.reass.l4_src_port),
 552                    &(vnet_buffer (b0)->ip.reass.l4_dst_port),
 553                    &(vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags),
 554                    &(vnet_buffer (b0)->ip.reass.tcp_ack_number),
 555                    &(vnet_buffer (b0)->ip.reass.tcp_seq_number)))
 556                 {
 557                   error0 = IP6_ERROR_REASS_UNSUPP_IP_PROTO;
 558                   b0->error = node->errors[error0];
 559                   next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 560                   goto packet_enqueue;
 561                 }
 562               vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
 563               next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
 564               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 565                 {
 566                   ip6_sv_reass_add_trace (vm, node, rm, NULL, bi0,
 567                                           REASS_PASSTHROUGH,
 568                                           vnet_buffer (b0)->ip.reass.ip_proto,
 569                                           vnet_buffer (b0)->ip.
 570                                           reass.l4_src_port,
 571                                           vnet_buffer (b0)->ip.
 572                                           reass.l4_dst_port);
 573                 }
 574               goto packet_enqueue;
 575             }
 576           vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
 577             (u8 *) frag_hdr - (u8 *) ip0;
 578           if (0 == ip6_frag_hdr_offset (frag_hdr))
 579             {
 580               // first fragment - verify upper-layer is present
 581               if (!ip6_sv_reass_verify_upper_layer_present
 582                   (node, b0, frag_hdr))
 583                 {
 584                   next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 585                   goto packet_enqueue;
 586                 }
 587             }
 588           if (!ip6_sv_reass_verify_fragment_multiple_8
 589               (vm, node, b0, frag_hdr)
 590               || !ip6_sv_reass_verify_packet_size_lt_64k (vm, node, b0,
 591                                                           frag_hdr))
 592             {
 593               next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 594               goto packet_enqueue;
 595             }
 596
 597           ip6_sv_reass_kv_t kv;
 598           u8 do_handoff = 0;
 599
 600           kv.k.as_u64[0] = ip0->src_address.as_u64[0];
 601           kv.k.as_u64[1] = ip0->src_address.as_u64[1];
 602           kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
 603           kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
 604           kv.k.as_u64[4] =
 605             ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
 606                             vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
 607             (u64) frag_hdr->identification;
 608           kv.k.as_u64[5] = ip0->protocol;
 609
 610           ip6_sv_reass_t *reass =
 611             ip6_sv_reass_find_or_create (vm, node, rm, rt, &kv, &icmp_bi,
 612                                          &do_handoff);
 613
 614           if (PREDICT_FALSE (do_handoff))
 615             {
 616               next0 = IP6_SV_REASSEMBLY_NEXT_HANDOFF;
 617               vnet_buffer (b0)->ip.reass.owner_thread_index =
 618                 kv.v.thread_index;
 619               goto packet_enqueue;
 620             }
 621
 622           if (!reass)
 623             {
 624               next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 625               error0 = IP6_ERROR_REASS_LIMIT_REACHED;
 626               b0->error = node->errors[error0];
 627               goto packet_enqueue;
 628             }
 629
 630           if (reass->is_complete)
 631             {
 632               vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 633                 ! !ip6_frag_hdr_offset (frag_hdr);
 634               vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 635               vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 636                 reass->icmp_type_or_tcp_flags;
 637               vnet_buffer (b0)->ip.reass.tcp_ack_number =
 638                 reass->tcp_ack_number;
 639               vnet_buffer (b0)->ip.reass.tcp_seq_number =
 640                 reass->tcp_seq_number;
 641               vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 642               vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 643               next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
 644               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 645                 {
 646                   ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
 647                                           REASS_FRAGMENT_FORWARD,
 648                                           reass->ip_proto,
 649                                           reass->l4_src_port,
 650                                           reass->l4_dst_port);
 651                 }
 652               goto packet_enqueue;
 653             }
 654
 655           switch (ip6_sv_reass_update
 656                   (vm, node, rm, rt, reass, bi0, frag_hdr))
 657             {
 658             case IP6_SV_REASS_RC_OK:
 659               /* nothing to do here */
 660               break;
 661             case IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS:
 662               vlib_node_increment_counter (vm, node->node_index,
 663                                            IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
 664                                            1);
 665               ip6_sv_reass_free (vm, rm, rt, reass);
 666               goto next_packet;
 667               break;
 668             case IP6_SV_REASS_RC_UNSUPP_IP_PROTO:
 669               vlib_node_increment_counter (vm, node->node_index,
 670                                            IP6_ERROR_REASS_UNSUPP_IP_PROTO,
 671                                            1);
 672               ip6_sv_reass_free (vm, rm, rt, reass);
 673               goto next_packet;
 674               break;
 675             case IP6_SV_REASS_RC_INTERNAL_ERROR:
 676               vlib_node_increment_counter (vm, node->node_index,
 677                                            IP6_ERROR_REASS_INTERNAL_ERROR, 1);
 678               ip6_sv_reass_free (vm, rm, rt, reass);
 679               goto next_packet;
 680               break;
 681             }
 682
 683           if (reass->is_complete)
 684             {
 685               u32 idx;
 686               vec_foreach_index (idx, reass->cached_buffers)
 687               {
 688                 u32 bi0 = vec_elt (reass->cached_buffers, idx);
 689                 if (0 == n_left_to_next)
 690                   {
 691                     vlib_put_next_frame (vm, node, next_index,
 692                                          n_left_to_next);
 693                     vlib_get_next_frame (vm, node, next_index, to_next,
 694                                          n_left_to_next);
 695                   }
 696                 to_next[0] = bi0;
 697                 to_next += 1;
 698                 n_left_to_next -= 1;
 699                 b0 = vlib_get_buffer (vm, bi0);
 700                 if (is_feature)
 701                   {
 702                     vnet_feature_next (&next0, b0);
 703                   }
 704                 frag_hdr =
 705                   vlib_buffer_get_current (b0) +
 706                   vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset;
 707                 vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 708                   ! !ip6_frag_hdr_offset (frag_hdr);
 709                 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 710                 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 711                   reass->icmp_type_or_tcp_flags;
 712                 vnet_buffer (b0)->ip.reass.tcp_ack_number =
 713                   reass->tcp_ack_number;
 714                 vnet_buffer (b0)->ip.reass.tcp_seq_number =
 715                   reass->tcp_seq_number;
 716                 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 717                 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 718                 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 719                   {
 720                     ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
 721                                             REASS_FRAGMENT_FORWARD,
 722                                             reass->ip_proto,
 723                                             reass->l4_src_port,
 724                                             reass->l4_dst_port);
 725                   }
 726                 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 727                                                  to_next, n_left_to_next, bi0,
 728                                                  next0);
 729               }
 730               _vec_len (reass->cached_buffers) = 0;     // buffers are owned by frame now
 731             }
 732           goto next_packet;
 733
 734         packet_enqueue:
 735           to_next[0] = bi0;
 736           to_next += 1;
 737           n_left_to_next -= 1;
 738           if (is_feature && IP6_ERROR_NONE == error0)
 739             {
 740               b0 = vlib_get_buffer (vm, bi0);
 741               vnet_feature_next (&next0, b0);
 742             }
 743           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 744                                            n_left_to_next, bi0, next0);
 745
 746           if (~0 != icmp_bi)
 747             {
 748               next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 749               to_next[0] = icmp_bi;
 750               to_next += 1;
 751               n_left_to_next -= 1;
 752               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 753                                                n_left_to_next, icmp_bi,
 754                                                next0);
 755             }
 756
 757         next_packet:
 758           from += 1;
 759           n_left_from -= 1;
 760         }
 761
 762       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 763     }
 764
 765   clib_spinlock_unlock (&rt->lock);
 766   return frame->n_vectors;
 767 }
 768
 769 static char *ip6_sv_reassembly_error_strings[] = {
 770 #define _(sym, string) string,
 771   foreach_ip6_error
 772 #undef _
 773 };
 774
 775 VLIB_NODE_FN (ip6_sv_reass_node) (vlib_main_t * vm,
 776                                   vlib_node_runtime_t * node,
 777                                   vlib_frame_t * frame)
 778 {
 779   return ip6_sv_reassembly_inline (vm, node, frame, false /* is_feature */ );
 780 }
 781
 782 /* *INDENT-OFF* */
 783 VLIB_REGISTER_NODE (ip6_sv_reass_node) = {
 784     .name = "ip6-sv-reassembly",
 785     .vector_size = sizeof (u32),
 786     .format_trace = format_ip6_sv_reass_trace,
 787     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
 788     .error_strings = ip6_sv_reassembly_error_strings,
 789     .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
 790     .next_nodes =
 791         {
 792                 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
 793                 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
 794                 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
 795                 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reassembly-handoff",
 796         },
 797 };
 798 /* *INDENT-ON* */
 799
 800 VLIB_NODE_FN (ip6_sv_reass_node_feature) (vlib_main_t * vm,
 801                                           vlib_node_runtime_t * node,
 802                                           vlib_frame_t * frame)
 803 {
 804   return ip6_sv_reassembly_inline (vm, node, frame, true /* is_feature */ );
 805 }
 806
 807 /* *INDENT-OFF* */
 808 VLIB_REGISTER_NODE (ip6_sv_reass_node_feature) = {
 809     .name = "ip6-sv-reassembly-feature",
 810     .vector_size = sizeof (u32),
 811     .format_trace = format_ip6_sv_reass_trace,
 812     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
 813     .error_strings = ip6_sv_reassembly_error_strings,
 814     .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
 815     .next_nodes =
 816         {
 817                 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
 818                 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
 819                 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
 820                 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reass-feature-hoff",
 821         },
 822 };
 823 /* *INDENT-ON* */
 824
 825 /* *INDENT-OFF* */
 826 VNET_FEATURE_INIT (ip6_sv_reassembly_feature) = {
 827     .arc_name = "ip6-unicast",
 828     .node_name = "ip6-sv-reassembly-feature",
 829     .runs_before = VNET_FEATURES ("ip6-lookup"),
 830     .runs_after = 0,
 831 };
 832 /* *INDENT-ON* */
 833
 834 #ifndef CLIB_MARCH_VARIANT
 835 static u32
 836 ip6_sv_reass_get_nbuckets ()
 837 {
 838   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 839   u32 nbuckets;
 840   u8 i;
 841
 842   nbuckets = (u32) (rm->max_reass_n / IP6_SV_REASS_HT_LOAD_FACTOR);
 843
 844   for (i = 0; i < 31; i++)
 845     if ((1 << i) >= nbuckets)
 846       break;
 847   nbuckets = 1 << i;
 848
 849   return nbuckets;
 850 }
 851 #endif /* CLIB_MARCH_VARIANT */
 852
 853 typedef enum
 854 {
 855   IP6_EVENT_CONFIG_CHANGED = 1,
 856 } ip6_sv_reass_event_t;
 857
 858 #ifndef CLIB_MARCH_VARIANT
 859 typedef struct
 860 {
 861   int failure;
 862   clib_bihash_48_8_t *new_hash;
 863 } ip6_rehash_cb_ctx;
 864
 865 static int
 866 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
 867 {
 868   ip6_rehash_cb_ctx *ctx = _ctx;
 869   if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
 870     {
 871       ctx->failure = 1;
 872     }
 873   return (BIHASH_WALK_CONTINUE);
 874 }
 875
 876 static void
 877 ip6_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
 878                          u32 max_reassembly_length,
 879                          u32 expire_walk_interval_ms)
 880 {
 881   ip6_sv_reass_main.timeout_ms = timeout_ms;
 882   ip6_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
 883   ip6_sv_reass_main.max_reass_n = max_reassemblies;
 884   ip6_sv_reass_main.max_reass_len = max_reassembly_length;
 885   ip6_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
 886 }
 887
 888 vnet_api_error_t
 889 ip6_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
 890                   u32 max_reassembly_length, u32 expire_walk_interval_ms)
 891 {
 892   u32 old_nbuckets = ip6_sv_reass_get_nbuckets ();
 893   ip6_sv_reass_set_params (timeout_ms, max_reassemblies,
 894                            max_reassembly_length, expire_walk_interval_ms);
 895   vlib_process_signal_event (ip6_sv_reass_main.vlib_main,
 896                              ip6_sv_reass_main.ip6_sv_reass_expire_node_idx,
 897                              IP6_EVENT_CONFIG_CHANGED, 0);
 898   u32 new_nbuckets = ip6_sv_reass_get_nbuckets ();
 899   if (ip6_sv_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
 900     {
 901       clib_bihash_48_8_t new_hash;
 902       clib_memset (&new_hash, 0, sizeof (new_hash));
 903       ip6_rehash_cb_ctx ctx;
 904       ctx.failure = 0;
 905       ctx.new_hash = &new_hash;
 906       clib_bihash_init_48_8 (&new_hash, "ip6-sv-reass", new_nbuckets,
 907                              new_nbuckets * 1024);
 908       clib_bihash_foreach_key_value_pair_48_8 (&ip6_sv_reass_main.hash,
 909                                                ip6_rehash_cb, &ctx);
 910       if (ctx.failure)
 911         {
 912           clib_bihash_free_48_8 (&new_hash);
 913           return -1;
 914         }
 915       else
 916         {
 917           clib_bihash_free_48_8 (&ip6_sv_reass_main.hash);
 918           clib_memcpy_fast (&ip6_sv_reass_main.hash, &new_hash,
 919                             sizeof (ip6_sv_reass_main.hash));
 920           clib_bihash_copied (&ip6_sv_reass_main.hash, &new_hash);
 921         }
 922     }
 923   return 0;
 924 }
 925
 926 vnet_api_error_t
 927 ip6_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
 928                   u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
 929 {
 930   *timeout_ms = ip6_sv_reass_main.timeout_ms;
 931   *max_reassemblies = ip6_sv_reass_main.max_reass_n;
 932   *max_reassembly_length = ip6_sv_reass_main.max_reass_len;
 933   *expire_walk_interval_ms = ip6_sv_reass_main.expire_walk_interval_ms;
 934   return 0;
 935 }
 936
 937 static clib_error_t *
 938 ip6_sv_reass_init_function (vlib_main_t * vm)
 939 {
 940   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 941   clib_error_t *error = 0;
 942   u32 nbuckets;
 943   vlib_node_t *node;
 944
 945   rm->vlib_main = vm;
 946   rm->vnet_main = vnet_get_main ();
 947
 948   vec_validate (rm->per_thread_data, vlib_num_workers ());
 949   ip6_sv_reass_per_thread_t *rt;
 950   vec_foreach (rt, rm->per_thread_data)
 951   {
 952     clib_spinlock_init (&rt->lock);
 953     pool_alloc (rt->pool, rm->max_reass_n);
 954     rt->lru_first = rt->lru_last = ~0;
 955   }
 956
 957   node = vlib_get_node_by_name (vm, (u8 *) "ip6-sv-reassembly-expire-walk");
 958   ASSERT (node);
 959   rm->ip6_sv_reass_expire_node_idx = node->index;
 960
 961   ip6_sv_reass_set_params (IP6_SV_REASS_TIMEOUT_DEFAULT_MS,
 962                            IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
 963                            IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
 964                            IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
 965
 966   nbuckets = ip6_sv_reass_get_nbuckets ();
 967   clib_bihash_init_48_8 (&rm->hash, "ip6-sv-reass", nbuckets,
 968                          nbuckets * 1024);
 969
 970   node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
 971   ASSERT (node);
 972   rm->ip6_drop_idx = node->index;
 973   node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
 974   ASSERT (node);
 975   rm->ip6_icmp_error_idx = node->index;
 976
 977   if ((error = vlib_call_init_function (vm, ip_main_init)))
 978     return error;
 979   ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
 980                          ip6_sv_reass_node.index);
 981
 982   rm->fq_index = vlib_frame_queue_main_init (ip6_sv_reass_node.index, 0);
 983   rm->fq_feature_index =
 984     vlib_frame_queue_main_init (ip6_sv_reass_node_feature.index, 0);
 985
 986   rm->feature_use_refcount_per_intf = NULL;
 987
 988   return error;
 989 }
 990
 991 VLIB_INIT_FUNCTION (ip6_sv_reass_init_function);
 992 #endif /* CLIB_MARCH_VARIANT */
 993
 994 static uword
 995 ip6_sv_reass_walk_expired (vlib_main_t * vm,
 996                            vlib_node_runtime_t * node, vlib_frame_t * f)
 997 {
 998   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 999   uword event_type, *event_data = 0;
1000
1001   while (true)
1002     {
1003       vlib_process_wait_for_event_or_clock (vm,
1004                                             (f64) rm->expire_walk_interval_ms
1005                                             / (f64) MSEC_PER_SEC);
1006       event_type = vlib_process_get_events (vm, &event_data);
1007
1008       switch (event_type)
1009         {
1010         case ~0:                /* no events => timeout */
1011           /* nothing to do here */
1012           break;
1013         case IP6_EVENT_CONFIG_CHANGED:
1014           break;
1015         default:
1016           clib_warning ("BUG: event type 0x%wx", event_type);
1017           break;
1018         }
1019       f64 now = vlib_time_now (vm);
1020
1021       ip6_sv_reass_t *reass;
1022       int *pool_indexes_to_free = NULL;
1023
1024       uword thread_index = 0;
1025       int index;
1026       const uword nthreads = vlib_num_workers () + 1;
1027       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1028         {
1029           ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1030           clib_spinlock_lock (&rt->lock);
1031
1032           vec_reset_length (pool_indexes_to_free);
1033           /* *INDENT-OFF* */
1034           pool_foreach_index (index, rt->pool)  {
1035                                 reass = pool_elt_at_index (rt->pool, index);
1036                                 if (now > reass->last_heard + rm->timeout)
1037                                   {
1038                                     vec_add1 (pool_indexes_to_free, index);
1039                                   }
1040                               }
1041           /* *INDENT-ON* */
1042           int *i;
1043           /* *INDENT-OFF* */
1044           vec_foreach (i, pool_indexes_to_free)
1045           {
1046             ip6_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1047             ip6_sv_reass_free (vm, rm, rt, reass);
1048           }
1049           /* *INDENT-ON* */
1050
1051           clib_spinlock_unlock (&rt->lock);
1052         }
1053
1054       vec_free (pool_indexes_to_free);
1055       if (event_data)
1056         {
1057           _vec_len (event_data) = 0;
1058         }
1059     }
1060
1061   return 0;
1062 }
1063
1064 /* *INDENT-OFF* */
1065 VLIB_REGISTER_NODE (ip6_sv_reass_expire_node) = {
1066     .function = ip6_sv_reass_walk_expired,
1067     .format_trace = format_ip6_sv_reass_trace,
1068     .type = VLIB_NODE_TYPE_PROCESS,
1069     .name = "ip6-sv-reassembly-expire-walk",
1070
1071     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
1072     .error_strings = ip6_sv_reassembly_error_strings,
1073
1074 };
1075 /* *INDENT-ON* */
1076
1077 static u8 *
1078 format_ip6_sv_reass_key (u8 * s, va_list * args)
1079 {
1080   ip6_sv_reass_key_t *key = va_arg (*args, ip6_sv_reass_key_t *);
1081   s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1082               key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1083               &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1084   return s;
1085 }
1086
1087 static u8 *
1088 format_ip6_sv_reass (u8 * s, va_list * args)
1089 {
1090   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1091   ip6_sv_reass_t *reass = va_arg (*args, ip6_sv_reass_t *);
1092
1093   s = format (s, "ID: %lu, key: %U, trace_op_counter: %u\n",
1094               reass->id, format_ip6_sv_reass_key, &reass->key,
1095               reass->trace_op_counter);
1096   vlib_buffer_t *b;
1097   u32 *bip;
1098   u32 counter = 0;
1099   vec_foreach (bip, reass->cached_buffers)
1100   {
1101     u32 bi = *bip;
1102     do
1103       {
1104         b = vlib_get_buffer (vm, bi);
1105         s = format (s, "  #%03u: bi: %u\n", counter, bi);
1106         ++counter;
1107         bi = b->next_buffer;
1108       }
1109     while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1110   }
1111   return s;
1112 }
1113
1114 static clib_error_t *
1115 show_ip6_sv_reass (vlib_main_t * vm, unformat_input_t * input,
1116                    CLIB_UNUSED (vlib_cli_command_t * lmd))
1117 {
1118   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1119
1120   vlib_cli_output (vm, "---------------------");
1121   vlib_cli_output (vm, "IP6 reassembly status");
1122   vlib_cli_output (vm, "---------------------");
1123   bool details = false;
1124   if (unformat (input, "details"))
1125     {
1126       details = true;
1127     }
1128
1129   u32 sum_reass_n = 0;
1130   u64 sum_buffers_n = 0;
1131   ip6_sv_reass_t *reass;
1132   uword thread_index;
1133   const uword nthreads = vlib_num_workers () + 1;
1134   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1135     {
1136       ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1137       clib_spinlock_lock (&rt->lock);
1138       if (details)
1139         {
1140           /* *INDENT-OFF* */
1141           pool_foreach (reass, rt->pool) {
1142             vlib_cli_output (vm, "%U", format_ip6_sv_reass, vm, reass);
1143           }
1144           /* *INDENT-ON* */
1145         }
1146       sum_reass_n += rt->reass_n;
1147       clib_spinlock_unlock (&rt->lock);
1148     }
1149   vlib_cli_output (vm, "---------------------");
1150   vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1151                    (long unsigned) sum_reass_n);
1152   vlib_cli_output (vm,
1153                    "Maximum configured concurrent shallow virtual IP6 reassemblies per worker-thread: %lu\n",
1154                    (long unsigned) rm->max_reass_n);
1155   vlib_cli_output (vm,
1156                    "Maximum configured shallow virtual IP6 reassembly timeout: %lums\n",
1157                    (long unsigned) rm->timeout_ms);
1158   vlib_cli_output (vm,
1159                    "Maximum configured shallow virtual IP6 reassembly expire walk interval: %lums\n",
1160                    (long unsigned) rm->expire_walk_interval_ms);
1161   vlib_cli_output (vm, "Buffers in use: %lu\n",
1162                    (long unsigned) sum_buffers_n);
1163   return 0;
1164 }
1165
1166 /* *INDENT-OFF* */
1167 VLIB_CLI_COMMAND (show_ip6_sv_reassembly_cmd, static) = {
1168     .path = "show ip6-sv-reassembly",
1169     .short_help = "show ip6-sv-reassembly [details]",
1170     .function = show_ip6_sv_reass,
1171 };
1172 /* *INDENT-ON* */
1173
1174 #ifndef CLIB_MARCH_VARIANT
1175 vnet_api_error_t
1176 ip6_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1177 {
1178   return ip6_sv_reass_enable_disable_with_refcnt (sw_if_index,
1179                                                   enable_disable);
1180 }
1181 #endif /* CLIB_MARCH_VARIANT */
1182
1183 #define foreach_ip6_sv_reassembly_handoff_error                       \
1184 _(CONGESTION_DROP, "congestion drop")
1185
1186
1187 typedef enum
1188 {
1189 #define _(sym,str) IP6_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
1190   foreach_ip6_sv_reassembly_handoff_error
1191 #undef _
1192     IP6_SV_REASSEMBLY_HANDOFF_N_ERROR,
1193 } ip6_sv_reassembly_handoff_error_t;
1194
1195 static char *ip6_sv_reassembly_handoff_error_strings[] = {
1196 #define _(sym,string) string,
1197   foreach_ip6_sv_reassembly_handoff_error
1198 #undef _
1199 };
1200
1201 typedef struct
1202 {
1203   u32 next_worker_index;
1204 } ip6_sv_reassembly_handoff_trace_t;
1205
1206 static u8 *
1207 format_ip6_sv_reassembly_handoff_trace (u8 * s, va_list * args)
1208 {
1209   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1210   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1211   ip6_sv_reassembly_handoff_trace_t *t =
1212     va_arg (*args, ip6_sv_reassembly_handoff_trace_t *);
1213
1214   s =
1215     format (s, "ip6-sv-reassembly-handoff: next-worker %d",
1216             t->next_worker_index);
1217
1218   return s;
1219 }
1220
1221 always_inline uword
1222 ip6_sv_reassembly_handoff_inline (vlib_main_t * vm,
1223                                   vlib_node_runtime_t * node,
1224                                   vlib_frame_t * frame, bool is_feature)
1225 {
1226   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1227
1228   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1229   u32 n_enq, n_left_from, *from;
1230   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1231   u32 fq_index;
1232
1233   from = vlib_frame_vector_args (frame);
1234   n_left_from = frame->n_vectors;
1235   vlib_get_buffers (vm, from, bufs, n_left_from);
1236
1237   b = bufs;
1238   ti = thread_indices;
1239
1240   fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1241
1242   while (n_left_from > 0)
1243     {
1244       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1245
1246       if (PREDICT_FALSE
1247           ((node->flags & VLIB_NODE_FLAG_TRACE)
1248            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1249         {
1250           ip6_sv_reassembly_handoff_trace_t *t =
1251             vlib_add_trace (vm, node, b[0], sizeof (*t));
1252           t->next_worker_index = ti[0];
1253         }
1254
1255       n_left_from -= 1;
1256       ti += 1;
1257       b += 1;
1258     }
1259   n_enq =
1260     vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1261                                    frame->n_vectors, 1);
1262
1263   if (n_enq < frame->n_vectors)
1264     vlib_node_increment_counter (vm, node->node_index,
1265                                  IP6_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1266                                  frame->n_vectors - n_enq);
1267   return frame->n_vectors;
1268 }
1269
1270 VLIB_NODE_FN (ip6_sv_reassembly_handoff_node) (vlib_main_t * vm,
1271                                                vlib_node_runtime_t * node,
1272                                                vlib_frame_t * frame)
1273 {
1274   return ip6_sv_reassembly_handoff_inline (vm, node, frame,
1275                                            false /* is_feature */ );
1276 }
1277
1278 /* *INDENT-OFF* */
1279 VLIB_REGISTER_NODE (ip6_sv_reassembly_handoff_node) = {
1280   .name = "ip6-sv-reassembly-handoff",
1281   .vector_size = sizeof (u32),
1282   .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1283   .error_strings = ip6_sv_reassembly_handoff_error_strings,
1284   .format_trace = format_ip6_sv_reassembly_handoff_trace,
1285
1286   .n_next_nodes = 1,
1287
1288   .next_nodes = {
1289     [0] = "error-drop",
1290   },
1291 };
1292
1293
1294 VLIB_NODE_FN (ip6_sv_reassembly_feature_handoff_node) (vlib_main_t * vm,
1295                                vlib_node_runtime_t * node, vlib_frame_t * frame)
1296 {
1297   return ip6_sv_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1298 }
1299
1300
1301 /* *INDENT-OFF* */
1302 VLIB_REGISTER_NODE (ip6_sv_reassembly_feature_handoff_node) = {
1303   .name = "ip6-sv-reass-feature-hoff",
1304   .vector_size = sizeof (u32),
1305   .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1306   .error_strings = ip6_sv_reassembly_handoff_error_strings,
1307   .format_trace = format_ip6_sv_reassembly_handoff_trace,
1308
1309   .n_next_nodes = 1,
1310
1311   .next_nodes = {
1312     [0] = "error-drop",
1313   },
1314 };
1315 /* *INDENT-ON* */
1316
1317 #ifndef CLIB_MARCH_VARIANT
1318 int
1319 ip6_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1320 {
1321   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1322   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1323   if (is_enable)
1324     {
1325       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1326         {
1327           ++rm->feature_use_refcount_per_intf[sw_if_index];
1328           return vnet_feature_enable_disable ("ip6-unicast",
1329                                               "ip6-sv-reassembly-feature",
1330                                               sw_if_index, 1, 0, 0);
1331         }
1332       ++rm->feature_use_refcount_per_intf[sw_if_index];
1333     }
1334   else
1335     {
1336       --rm->feature_use_refcount_per_intf[sw_if_index];
1337       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1338         return vnet_feature_enable_disable ("ip6-unicast",
1339                                             "ip6-sv-reassembly-feature",
1340                                             sw_if_index, 0, 0, 0);
1341     }
1342   return 0;
1343 }
1344 #endif
1345
1346 /*
1347  * fd.io coding-style-patch-verification: ON
1348  *
1349  * Local Variables:
1350  * eval: (c-set-style "gnu")
1351  * End:
1352  */