src/vnet/ip/reass/ip6_sv_reass.c

   1 /*
   2  * Copyright (c) 2017 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 /**
  17  * @file
  18  * @brief IPv6 Shallow Virtual Reassembly.
  19  *
  20  * This file contains the source code for IPv6 Shallow Virtual reassembly.
  21  */
  22
  23 #include <vppinfra/vec.h>
  24 #include <vnet/vnet.h>
  25 #include <vnet/ip/ip.h>
  26 #include <vnet/ip/ip6_to_ip4.h>
  27 #include <vppinfra/bihash_48_8.h>
  28 #include <vnet/ip/reass/ip6_sv_reass.h>
  29 #include <vnet/ip/ip6_inlines.h>
  30
  31 #define MSEC_PER_SEC 1000
  32 #define IP6_SV_REASS_TIMEOUT_DEFAULT_MS 100
  33 #define IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000      // 10 seconds default
  34 #define IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT 1024
  35 #define IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
  36 #define IP6_SV_REASS_HT_LOAD_FACTOR (0.75)
  37
  38 typedef enum
  39 {
  40   IP6_SV_REASS_RC_OK,
  41   IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS,
  42   IP6_SV_REASS_RC_INTERNAL_ERROR,
  43   IP6_SV_REASS_RC_UNSUPP_IP_PROTO,
  44   IP6_SV_REASS_RC_INVALID_FRAG_LEN,
  45 } ip6_sv_reass_rc_t;
  46
  47 typedef struct
  48 {
  49   union
  50   {
  51     struct
  52     {
  53       ip6_address_t src;
  54       ip6_address_t dst;
  55       u32 fib_index;
  56       u32 frag_id;
  57       u8 unused[7];
  58       u8 proto;
  59     };
  60     u64 as_u64[6];
  61   };
  62 } ip6_sv_reass_key_t;
  63
  64 typedef union
  65 {
  66   struct
  67   {
  68     u32 reass_index;
  69     u32 thread_index;
  70   };
  71   u64 as_u64;
  72 } ip6_sv_reass_val_t;
  73
  74 typedef union
  75 {
  76   struct
  77   {
  78     ip6_sv_reass_key_t k;
  79     ip6_sv_reass_val_t v;
  80   };
  81   clib_bihash_kv_48_8_t kv;
  82 } ip6_sv_reass_kv_t;
  83
  84 typedef struct
  85 {
  86   // hash table key
  87   ip6_sv_reass_key_t key;
  88   // time when last packet was received
  89   f64 last_heard;
  90   // internal id of this reassembly
  91   u64 id;
  92   // trace operation counter
  93   u32 trace_op_counter;
  94   // buffer indexes of buffers in this reassembly in chronological order -
  95   // including overlaps and duplicate fragments
  96   u32 *cached_buffers;
  97   // set to true when this reassembly is completed
  98   bool is_complete;
  99   // ip protocol
 100   u8 ip_proto;
 101   u8 icmp_type_or_tcp_flags;
 102   u32 tcp_ack_number;
 103   u32 tcp_seq_number;
 104   // l4 src port
 105   u16 l4_src_port;
 106   // l4 dst port
 107   u16 l4_dst_port;
 108   // lru indexes
 109   u32 lru_prev;
 110   u32 lru_next;
 111 } ip6_sv_reass_t;
 112
 113 typedef struct
 114 {
 115   ip6_sv_reass_t *pool;
 116   u32 reass_n;
 117   u32 id_counter;
 118   clib_spinlock_t lock;
 119   // lru indexes
 120   u32 lru_first;
 121   u32 lru_last;
 122 } ip6_sv_reass_per_thread_t;
 123
 124 typedef struct
 125 {
 126   // IPv6 config
 127   u32 timeout_ms;
 128   f64 timeout;
 129   u32 expire_walk_interval_ms;
 130   // maximum number of fragments in one reassembly
 131   u32 max_reass_len;
 132   // maximum number of reassemblies
 133   u32 max_reass_n;
 134
 135   // IPv6 runtime
 136   clib_bihash_48_8_t hash;
 137
 138   // per-thread data
 139   ip6_sv_reass_per_thread_t *per_thread_data;
 140
 141   // convenience
 142   vlib_main_t *vlib_main;
 143   vnet_main_t *vnet_main;
 144
 145   // node index of ip6-drop node
 146   u32 ip6_drop_idx;
 147   u32 ip6_icmp_error_idx;
 148   u32 ip6_sv_reass_expire_node_idx;
 149
 150   /** Worker handoff */
 151   u32 fq_index;
 152   u32 fq_feature_index;
 153
 154   // reference count for enabling/disabling feature - per interface
 155   u32 *feature_use_refcount_per_intf;
 156 } ip6_sv_reass_main_t;
 157
 158 extern ip6_sv_reass_main_t ip6_sv_reass_main;
 159
 160 #ifndef CLIB_MARCH_VARIANT
 161 ip6_sv_reass_main_t ip6_sv_reass_main;
 162 #endif /* CLIB_MARCH_VARIANT */
 163
 164 typedef enum
 165 {
 166   IP6_SV_REASSEMBLY_NEXT_INPUT,
 167   IP6_SV_REASSEMBLY_NEXT_DROP,
 168   IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR,
 169   IP6_SV_REASSEMBLY_NEXT_HANDOFF,
 170   IP6_SV_REASSEMBLY_N_NEXT,
 171 } ip6_sv_reass_next_t;
 172
 173 typedef enum
 174 {
 175   REASS_FRAGMENT_CACHE,
 176   REASS_FINISH,
 177   REASS_FRAGMENT_FORWARD,
 178   REASS_PASSTHROUGH,
 179 } ip6_sv_reass_trace_operation_e;
 180
 181 typedef struct
 182 {
 183   ip6_sv_reass_trace_operation_e action;
 184   u32 reass_id;
 185   u32 op_id;
 186   u8 ip_proto;
 187   u16 l4_src_port;
 188   u16 l4_dst_port;
 189 } ip6_sv_reass_trace_t;
 190
 191 static u8 *
 192 format_ip6_sv_reass_trace (u8 * s, va_list * args)
 193 {
 194   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 195   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 196   ip6_sv_reass_trace_t *t = va_arg (*args, ip6_sv_reass_trace_t *);
 197   if (REASS_PASSTHROUGH != t->action)
 198     {
 199       s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
 200     }
 201   switch (t->action)
 202     {
 203     case REASS_FRAGMENT_CACHE:
 204       s = format (s, "[cached]");
 205       break;
 206     case REASS_FINISH:
 207       s =
 208         format (s, "[finish, ip proto=%u, src_port=%u, dst_port=%u]",
 209                 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
 210                 clib_net_to_host_u16 (t->l4_dst_port));
 211       break;
 212     case REASS_FRAGMENT_FORWARD:
 213       s =
 214         format (s, "[forward, ip proto=%u, src_port=%u, dst_port=%u]",
 215                 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
 216                 clib_net_to_host_u16 (t->l4_dst_port));
 217       break;
 218     case REASS_PASSTHROUGH:
 219       s = format (s, "[not fragmented or atomic fragment]");
 220       break;
 221     }
 222   return s;
 223 }
 224
 225 static void
 226 ip6_sv_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 227                         ip6_sv_reass_t * reass, u32 bi,
 228                         ip6_sv_reass_trace_operation_e action,
 229                         u32 ip_proto, u16 l4_src_port, u16 l4_dst_port)
 230 {
 231   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 232   if (pool_is_free_index
 233       (vm->trace_main.trace_buffer_pool, vlib_buffer_get_trace_index (b)))
 234     {
 235       // this buffer's trace is gone
 236       b->flags &= ~VLIB_BUFFER_IS_TRACED;
 237       return;
 238     }
 239   ip6_sv_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 240   if (reass)
 241     {
 242       t->reass_id = reass->id;
 243       t->op_id = reass->trace_op_counter;
 244       ++reass->trace_op_counter;
 245     }
 246   t->action = action;
 247   t->ip_proto = ip_proto;
 248   t->l4_src_port = l4_src_port;
 249   t->l4_dst_port = l4_dst_port;
 250 #if 0
 251   static u8 *s = NULL;
 252   s = format (s, "%U", format_ip6_sv_reass_trace, NULL, NULL, t);
 253   printf ("%.*s\n", vec_len (s), s);
 254   fflush (stdout);
 255   vec_reset_length (s);
 256 #endif
 257 }
 258
 259 always_inline void
 260 ip6_sv_reass_free (vlib_main_t * vm, ip6_sv_reass_main_t * rm,
 261                    ip6_sv_reass_per_thread_t * rt, ip6_sv_reass_t * reass)
 262 {
 263   clib_bihash_kv_48_8_t kv;
 264   kv.key[0] = reass->key.as_u64[0];
 265   kv.key[1] = reass->key.as_u64[1];
 266   kv.key[2] = reass->key.as_u64[2];
 267   kv.key[3] = reass->key.as_u64[3];
 268   kv.key[4] = reass->key.as_u64[4];
 269   kv.key[5] = reass->key.as_u64[5];
 270   clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
 271   vlib_buffer_free (vm, reass->cached_buffers,
 272                     vec_len (reass->cached_buffers));
 273   vec_free (reass->cached_buffers);
 274   reass->cached_buffers = NULL;
 275   if (~0 != reass->lru_prev)
 276     {
 277       ip6_sv_reass_t *lru_prev =
 278         pool_elt_at_index (rt->pool, reass->lru_prev);
 279       lru_prev->lru_next = reass->lru_next;
 280     }
 281   if (~0 != reass->lru_next)
 282     {
 283       ip6_sv_reass_t *lru_next =
 284         pool_elt_at_index (rt->pool, reass->lru_next);
 285       lru_next->lru_prev = reass->lru_prev;
 286     }
 287   if (rt->lru_first == reass - rt->pool)
 288     {
 289       rt->lru_first = reass->lru_next;
 290     }
 291   if (rt->lru_last == reass - rt->pool)
 292     {
 293       rt->lru_last = reass->lru_prev;
 294     }
 295   pool_put (rt->pool, reass);
 296   --rt->reass_n;
 297 }
 298
 299 always_inline void
 300 ip6_sv_reass_init (ip6_sv_reass_t * reass)
 301 {
 302   reass->cached_buffers = NULL;
 303   reass->is_complete = false;
 304 }
 305
 306 always_inline ip6_sv_reass_t *
 307 ip6_sv_reass_find_or_create (vlib_main_t *vm, ip6_sv_reass_main_t *rm,
 308                              ip6_sv_reass_per_thread_t *rt,
 309                              ip6_sv_reass_kv_t *kv, u8 *do_handoff)
 310 {
 311   ip6_sv_reass_t *reass = NULL;
 312   f64 now = vlib_time_now (vm);
 313
 314   if (!clib_bihash_search_48_8 (&rm->hash, &kv->kv, &kv->kv))
 315     {
 316       if (vm->thread_index != kv->v.thread_index)
 317         {
 318           *do_handoff = 1;
 319           return NULL;
 320         }
 321       reass = pool_elt_at_index (rt->pool, kv->v.reass_index);
 322
 323       if (now > reass->last_heard + rm->timeout)
 324         {
 325           ip6_sv_reass_free (vm, rm, rt, reass);
 326           reass = NULL;
 327         }
 328     }
 329
 330   if (reass)
 331     {
 332       reass->last_heard = now;
 333       return reass;
 334     }
 335
 336   if (rt->reass_n >= rm->max_reass_n)
 337     {
 338       reass = pool_elt_at_index (rt->pool, rt->lru_first);
 339       ip6_sv_reass_free (vm, rm, rt, reass);
 340     }
 341
 342   pool_get (rt->pool, reass);
 343   clib_memset (reass, 0, sizeof (*reass));
 344   reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 345   ++rt->id_counter;
 346   ip6_sv_reass_init (reass);
 347   ++rt->reass_n;
 348
 349   reass->lru_prev = reass->lru_next = ~0;
 350
 351   if (~0 != rt->lru_last)
 352     {
 353       ip6_sv_reass_t *lru_last = pool_elt_at_index (rt->pool, rt->lru_last);
 354       reass->lru_prev = rt->lru_last;
 355       lru_last->lru_next = rt->lru_last = reass - rt->pool;
 356     }
 357
 358   if (~0 == rt->lru_first)
 359     {
 360       rt->lru_first = rt->lru_last = reass - rt->pool;
 361     }
 362
 363   reass->key.as_u64[0] = kv->kv.key[0];
 364   reass->key.as_u64[1] = kv->kv.key[1];
 365   reass->key.as_u64[2] = kv->kv.key[2];
 366   reass->key.as_u64[3] = kv->kv.key[3];
 367   reass->key.as_u64[4] = kv->kv.key[4];
 368   reass->key.as_u64[5] = kv->kv.key[5];
 369   kv->v.reass_index = (reass - rt->pool);
 370   kv->v.thread_index = vm->thread_index;
 371   reass->last_heard = now;
 372
 373   if (clib_bihash_add_del_48_8 (&rm->hash, &kv->kv, 1))
 374     {
 375       ip6_sv_reass_free (vm, rm, rt, reass);
 376       reass = NULL;
 377     }
 378
 379   return reass;
 380 }
 381
 382 always_inline ip6_sv_reass_rc_t
 383 ip6_sv_reass_update (vlib_main_t *vm, vlib_node_runtime_t *node,
 384                      ip6_sv_reass_main_t *rm, ip6_sv_reass_t *reass, u32 bi0,
 385                      ip6_frag_hdr_t *frag_hdr)
 386 {
 387   vlib_buffer_t *fb = vlib_get_buffer (vm, bi0);
 388   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 389   fvnb->ip.reass.ip6_frag_hdr_offset =
 390     (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
 391   ip6_header_t *fip = vlib_buffer_get_current (fb);
 392   if (fb->current_length < sizeof (*fip) ||
 393       fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
 394       fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
 395     {
 396       return IP6_SV_REASS_RC_INTERNAL_ERROR;
 397     }
 398
 399   u32 fragment_first = fvnb->ip.reass.fragment_first =
 400     ip6_frag_hdr_offset_bytes (frag_hdr);
 401   u32 fragment_length =
 402     vlib_buffer_length_in_chain (vm, fb) -
 403     (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 404   if (0 == fragment_length)
 405     {
 406       return IP6_SV_REASS_RC_INVALID_FRAG_LEN;
 407     }
 408   u32 fragment_last = fvnb->ip.reass.fragment_last =
 409     fragment_first + fragment_length - 1;
 410   fvnb->ip.reass.range_first = fragment_first;
 411   fvnb->ip.reass.range_last = fragment_last;
 412   fvnb->ip.reass.next_range_bi = ~0;
 413   if (0 == fragment_first)
 414     {
 415       if (!ip6_get_port
 416           (vm, fb, fip, fb->current_length, &reass->ip_proto,
 417            &reass->l4_src_port, &reass->l4_dst_port,
 418            &reass->icmp_type_or_tcp_flags, &reass->tcp_ack_number,
 419            &reass->tcp_seq_number))
 420         return IP6_SV_REASS_RC_UNSUPP_IP_PROTO;
 421
 422       reass->is_complete = true;
 423       vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
 424       if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 425         {
 426           ip6_sv_reass_add_trace (vm, node, reass, bi0, REASS_FINISH,
 427                                   reass->ip_proto, reass->l4_src_port,
 428                                   reass->l4_dst_port);
 429         }
 430     }
 431   vec_add1 (reass->cached_buffers, bi0);
 432   if (!reass->is_complete)
 433     {
 434       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 435         {
 436           ip6_sv_reass_add_trace (vm, node, reass, bi0, REASS_FRAGMENT_CACHE,
 437                                   reass->ip_proto, reass->l4_src_port,
 438                                   reass->l4_dst_port);
 439         }
 440       if (vec_len (reass->cached_buffers) > rm->max_reass_len)
 441         {
 442           return IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS;
 443         }
 444     }
 445   return IP6_SV_REASS_RC_OK;
 446 }
 447
 448 always_inline bool
 449 ip6_sv_reass_verify_upper_layer_present (vlib_node_runtime_t *node,
 450                                          vlib_buffer_t *b,
 451                                          ip6_ext_hdr_chain_t *hc)
 452 {
 453   int nh = hc->eh[hc->length - 1].protocol;
 454   /* Checking to see if it's a terminating header */
 455   if (ip6_ext_hdr (nh))
 456     {
 457       icmp6_error_set_vnet_buffer (
 458         b, ICMP6_parameter_problem,
 459         ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain, 0);
 460       b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
 461       return false;
 462     }
 463   return true;
 464 }
 465
 466 always_inline bool
 467 ip6_sv_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
 468                                          vlib_buffer_t * b,
 469                                          ip6_frag_hdr_t * frag_hdr)
 470 {
 471   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 472   ip6_header_t *ip = vlib_buffer_get_current (b);
 473   int more_fragments = ip6_frag_hdr_more (frag_hdr);
 474   u32 fragment_length =
 475     vlib_buffer_length_in_chain (vm, b) -
 476     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 477   if (more_fragments && 0 != fragment_length % 8)
 478     {
 479       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 480                                    ICMP6_parameter_problem_erroneous_header_field,
 481                                    (u8 *) & ip->payload_length - (u8 *) ip);
 482       return false;
 483     }
 484   return true;
 485 }
 486
 487 always_inline bool
 488 ip6_sv_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
 489                                         vlib_buffer_t * b,
 490                                         ip6_frag_hdr_t * frag_hdr)
 491 {
 492   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 493   u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
 494   u32 fragment_length =
 495     vlib_buffer_length_in_chain (vm, b) -
 496     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 497   if (fragment_first + fragment_length > 65535)
 498     {
 499       ip6_header_t *ip0 = vlib_buffer_get_current (b);
 500       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 501                                    ICMP6_parameter_problem_erroneous_header_field,
 502                                    (u8 *) & frag_hdr->fragment_offset_and_more
 503                                    - (u8 *) ip0);
 504       return false;
 505     }
 506   return true;
 507 }
 508
 509 always_inline uword
 510 ip6_sv_reassembly_inline (vlib_main_t * vm,
 511                           vlib_node_runtime_t * node,
 512                           vlib_frame_t * frame, bool is_feature)
 513 {
 514   u32 *from = vlib_frame_vector_args (frame);
 515   u32 n_left_from, n_left_to_next, *to_next, next_index;
 516   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 517   ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
 518   clib_spinlock_lock (&rt->lock);
 519
 520   n_left_from = frame->n_vectors;
 521   next_index = node->cached_next_index;
 522
 523   while (n_left_from > 0)
 524     {
 525       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 526
 527       while (n_left_from > 0 && n_left_to_next > 0)
 528         {
 529           u32 bi0;
 530           vlib_buffer_t *b0;
 531           u32 next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 532           u32 error0 = IP6_ERROR_NONE;
 533
 534           bi0 = from[0];
 535           b0 = vlib_get_buffer (vm, bi0);
 536
 537           ip6_header_t *ip0 = vlib_buffer_get_current (b0);
 538           ip6_frag_hdr_t *frag_hdr;
 539           ip6_ext_hdr_chain_t hdr_chain;
 540           bool is_atomic_fragment = false;
 541
 542           int res = ip6_ext_header_walk (
 543             b0, ip0, IP_PROTOCOL_IPV6_FRAGMENTATION, &hdr_chain);
 544           if (res >= 0 &&
 545               hdr_chain.eh[res].protocol == IP_PROTOCOL_IPV6_FRAGMENTATION)
 546             {
 547               frag_hdr =
 548                 ip6_ext_next_header_offset (ip0, hdr_chain.eh[res].offset);
 549               is_atomic_fragment = (0 == ip6_frag_hdr_offset (frag_hdr) &&
 550                                     !ip6_frag_hdr_more (frag_hdr));
 551             }
 552
 553           if (res < 0 ||
 554               hdr_chain.eh[res].protocol != IP_PROTOCOL_IPV6_FRAGMENTATION ||
 555               is_atomic_fragment)
 556             {
 557               // this is a regular unfragmented packet or an atomic fragment
 558               if (!ip6_get_port
 559                   (vm, b0, ip0, b0->current_length,
 560                    &(vnet_buffer (b0)->ip.reass.ip_proto),
 561                    &(vnet_buffer (b0)->ip.reass.l4_src_port),
 562                    &(vnet_buffer (b0)->ip.reass.l4_dst_port),
 563                    &(vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags),
 564                    &(vnet_buffer (b0)->ip.reass.tcp_ack_number),
 565                    &(vnet_buffer (b0)->ip.reass.tcp_seq_number)))
 566                 {
 567                   error0 = IP6_ERROR_REASS_UNSUPP_IP_PROTO;
 568                   b0->error = node->errors[error0];
 569                   next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 570                   goto packet_enqueue;
 571                 }
 572               vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
 573               next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
 574               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 575                 {
 576                   ip6_sv_reass_add_trace (
 577                     vm, node, NULL, bi0, REASS_PASSTHROUGH,
 578                     vnet_buffer (b0)->ip.reass.ip_proto,
 579                     vnet_buffer (b0)->ip.reass.l4_src_port,
 580                     vnet_buffer (b0)->ip.reass.l4_dst_port);
 581                 }
 582               goto packet_enqueue;
 583             }
 584
 585           vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
 586             hdr_chain.eh[res].offset;
 587
 588           if (0 == ip6_frag_hdr_offset (frag_hdr))
 589             {
 590               // first fragment - verify upper-layer is present
 591               if (!ip6_sv_reass_verify_upper_layer_present (node, b0,
 592                                                             &hdr_chain))
 593                 {
 594                   next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 595                   goto packet_enqueue;
 596                 }
 597             }
 598           if (!ip6_sv_reass_verify_fragment_multiple_8 (vm, b0, frag_hdr) ||
 599               !ip6_sv_reass_verify_packet_size_lt_64k (vm, b0, frag_hdr))
 600             {
 601               next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 602               goto packet_enqueue;
 603             }
 604
 605           ip6_sv_reass_kv_t kv;
 606           u8 do_handoff = 0;
 607
 608           kv.k.as_u64[0] = ip0->src_address.as_u64[0];
 609           kv.k.as_u64[1] = ip0->src_address.as_u64[1];
 610           kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
 611           kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
 612           kv.k.as_u64[4] =
 613             ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
 614                             vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
 615             (u64) frag_hdr->identification;
 616           kv.k.as_u64[5] = ip0->protocol;
 617
 618           ip6_sv_reass_t *reass =
 619             ip6_sv_reass_find_or_create (vm, rm, rt, &kv, &do_handoff);
 620
 621           if (PREDICT_FALSE (do_handoff))
 622             {
 623               next0 = IP6_SV_REASSEMBLY_NEXT_HANDOFF;
 624               vnet_buffer (b0)->ip.reass.owner_thread_index =
 625                 kv.v.thread_index;
 626               goto packet_enqueue;
 627             }
 628
 629           if (!reass)
 630             {
 631               next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 632               error0 = IP6_ERROR_REASS_LIMIT_REACHED;
 633               b0->error = node->errors[error0];
 634               goto packet_enqueue;
 635             }
 636
 637           if (reass->is_complete)
 638             {
 639               vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 640                 ! !ip6_frag_hdr_offset (frag_hdr);
 641               vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 642               vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 643                 reass->icmp_type_or_tcp_flags;
 644               vnet_buffer (b0)->ip.reass.tcp_ack_number =
 645                 reass->tcp_ack_number;
 646               vnet_buffer (b0)->ip.reass.tcp_seq_number =
 647                 reass->tcp_seq_number;
 648               vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 649               vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 650               next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
 651               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 652                 {
 653                   ip6_sv_reass_add_trace (
 654                     vm, node, reass, bi0, REASS_FRAGMENT_FORWARD,
 655                     reass->ip_proto, reass->l4_src_port, reass->l4_dst_port);
 656                 }
 657               goto packet_enqueue;
 658             }
 659
 660           u32 counter = ~0;
 661           switch (ip6_sv_reass_update (vm, node, rm, reass, bi0, frag_hdr))
 662             {
 663             case IP6_SV_REASS_RC_OK:
 664               /* nothing to do here */
 665               break;
 666             case IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS:
 667               counter = IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG;
 668               break;
 669             case IP6_SV_REASS_RC_UNSUPP_IP_PROTO:
 670               counter = IP6_ERROR_REASS_UNSUPP_IP_PROTO;
 671               break;
 672             case IP6_SV_REASS_RC_INTERNAL_ERROR:
 673               counter = IP6_ERROR_REASS_INTERNAL_ERROR;
 674               break;
 675             case IP6_SV_REASS_RC_INVALID_FRAG_LEN:
 676               counter = IP6_ERROR_REASS_INVALID_FRAG_LEN;
 677               break;
 678             }
 679           if (~0 != counter)
 680             {
 681               vlib_node_increment_counter (vm, node->node_index, counter, 1);
 682               ip6_sv_reass_free (vm, rm, rt, reass);
 683               goto next_packet;
 684             }
 685
 686           if (reass->is_complete)
 687             {
 688               u32 idx;
 689               vec_foreach_index (idx, reass->cached_buffers)
 690               {
 691                 u32 bi0 = vec_elt (reass->cached_buffers, idx);
 692                 if (0 == n_left_to_next)
 693                   {
 694                     vlib_put_next_frame (vm, node, next_index,
 695                                          n_left_to_next);
 696                     vlib_get_next_frame (vm, node, next_index, to_next,
 697                                          n_left_to_next);
 698                   }
 699                 to_next[0] = bi0;
 700                 to_next += 1;
 701                 n_left_to_next -= 1;
 702                 b0 = vlib_get_buffer (vm, bi0);
 703                 if (is_feature)
 704                   {
 705                     vnet_feature_next (&next0, b0);
 706                   }
 707                 frag_hdr =
 708                   vlib_buffer_get_current (b0) +
 709                   vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset;
 710                 vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 711                   ! !ip6_frag_hdr_offset (frag_hdr);
 712                 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 713                 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 714                   reass->icmp_type_or_tcp_flags;
 715                 vnet_buffer (b0)->ip.reass.tcp_ack_number =
 716                   reass->tcp_ack_number;
 717                 vnet_buffer (b0)->ip.reass.tcp_seq_number =
 718                   reass->tcp_seq_number;
 719                 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 720                 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 721                 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 722                   {
 723                     ip6_sv_reass_add_trace (
 724                       vm, node, reass, bi0, REASS_FRAGMENT_FORWARD,
 725                       reass->ip_proto, reass->l4_src_port, reass->l4_dst_port);
 726                   }
 727                 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 728                                                  to_next, n_left_to_next, bi0,
 729                                                  next0);
 730               }
 731               _vec_len (reass->cached_buffers) = 0;     // buffers are owned by frame now
 732             }
 733           goto next_packet;
 734
 735         packet_enqueue:
 736           to_next[0] = bi0;
 737           to_next += 1;
 738           n_left_to_next -= 1;
 739           if (is_feature && IP6_ERROR_NONE == error0)
 740             {
 741               b0 = vlib_get_buffer (vm, bi0);
 742               vnet_feature_next (&next0, b0);
 743             }
 744           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 745                                            n_left_to_next, bi0, next0);
 746
 747         next_packet:
 748           from += 1;
 749           n_left_from -= 1;
 750         }
 751
 752       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 753     }
 754
 755   clib_spinlock_unlock (&rt->lock);
 756   return frame->n_vectors;
 757 }
 758
 759 static char *ip6_sv_reassembly_error_strings[] = {
 760 #define _(sym, string) string,
 761   foreach_ip6_error
 762 #undef _
 763 };
 764
 765 VLIB_NODE_FN (ip6_sv_reass_node) (vlib_main_t * vm,
 766                                   vlib_node_runtime_t * node,
 767                                   vlib_frame_t * frame)
 768 {
 769   return ip6_sv_reassembly_inline (vm, node, frame, false /* is_feature */ );
 770 }
 771
 772 /* *INDENT-OFF* */
 773 VLIB_REGISTER_NODE (ip6_sv_reass_node) = {
 774     .name = "ip6-sv-reassembly",
 775     .vector_size = sizeof (u32),
 776     .format_trace = format_ip6_sv_reass_trace,
 777     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
 778     .error_strings = ip6_sv_reassembly_error_strings,
 779     .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
 780     .next_nodes =
 781         {
 782                 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
 783                 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
 784                 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
 785                 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reassembly-handoff",
 786         },
 787 };
 788 /* *INDENT-ON* */
 789
 790 VLIB_NODE_FN (ip6_sv_reass_node_feature) (vlib_main_t * vm,
 791                                           vlib_node_runtime_t * node,
 792                                           vlib_frame_t * frame)
 793 {
 794   return ip6_sv_reassembly_inline (vm, node, frame, true /* is_feature */ );
 795 }
 796
 797 /* *INDENT-OFF* */
 798 VLIB_REGISTER_NODE (ip6_sv_reass_node_feature) = {
 799     .name = "ip6-sv-reassembly-feature",
 800     .vector_size = sizeof (u32),
 801     .format_trace = format_ip6_sv_reass_trace,
 802     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
 803     .error_strings = ip6_sv_reassembly_error_strings,
 804     .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
 805     .next_nodes =
 806         {
 807                 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
 808                 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
 809                 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
 810                 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reass-feature-hoff",
 811         },
 812 };
 813 /* *INDENT-ON* */
 814
 815 /* *INDENT-OFF* */
 816 VNET_FEATURE_INIT (ip6_sv_reassembly_feature) = {
 817     .arc_name = "ip6-unicast",
 818     .node_name = "ip6-sv-reassembly-feature",
 819     .runs_before = VNET_FEATURES ("ip6-lookup"),
 820     .runs_after = 0,
 821 };
 822 /* *INDENT-ON* */
 823
 824 #ifndef CLIB_MARCH_VARIANT
 825 static u32
 826 ip6_sv_reass_get_nbuckets ()
 827 {
 828   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 829   u32 nbuckets;
 830   u8 i;
 831
 832   nbuckets = (u32) (rm->max_reass_n / IP6_SV_REASS_HT_LOAD_FACTOR);
 833
 834   for (i = 0; i < 31; i++)
 835     if ((1 << i) >= nbuckets)
 836       break;
 837   nbuckets = 1 << i;
 838
 839   return nbuckets;
 840 }
 841 #endif /* CLIB_MARCH_VARIANT */
 842
 843 typedef enum
 844 {
 845   IP6_EVENT_CONFIG_CHANGED = 1,
 846 } ip6_sv_reass_event_t;
 847
 848 #ifndef CLIB_MARCH_VARIANT
 849 typedef struct
 850 {
 851   int failure;
 852   clib_bihash_48_8_t *new_hash;
 853 } ip6_rehash_cb_ctx;
 854
 855 static int
 856 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
 857 {
 858   ip6_rehash_cb_ctx *ctx = _ctx;
 859   if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
 860     {
 861       ctx->failure = 1;
 862     }
 863   return (BIHASH_WALK_CONTINUE);
 864 }
 865
 866 static void
 867 ip6_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
 868                          u32 max_reassembly_length,
 869                          u32 expire_walk_interval_ms)
 870 {
 871   ip6_sv_reass_main.timeout_ms = timeout_ms;
 872   ip6_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
 873   ip6_sv_reass_main.max_reass_n = max_reassemblies;
 874   ip6_sv_reass_main.max_reass_len = max_reassembly_length;
 875   ip6_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
 876 }
 877
 878 vnet_api_error_t
 879 ip6_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
 880                   u32 max_reassembly_length, u32 expire_walk_interval_ms)
 881 {
 882   u32 old_nbuckets = ip6_sv_reass_get_nbuckets ();
 883   ip6_sv_reass_set_params (timeout_ms, max_reassemblies,
 884                            max_reassembly_length, expire_walk_interval_ms);
 885   vlib_process_signal_event (ip6_sv_reass_main.vlib_main,
 886                              ip6_sv_reass_main.ip6_sv_reass_expire_node_idx,
 887                              IP6_EVENT_CONFIG_CHANGED, 0);
 888   u32 new_nbuckets = ip6_sv_reass_get_nbuckets ();
 889   if (ip6_sv_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
 890     {
 891       clib_bihash_48_8_t new_hash;
 892       clib_memset (&new_hash, 0, sizeof (new_hash));
 893       ip6_rehash_cb_ctx ctx;
 894       ctx.failure = 0;
 895       ctx.new_hash = &new_hash;
 896       clib_bihash_init_48_8 (&new_hash, "ip6-sv-reass", new_nbuckets,
 897                              new_nbuckets * 1024);
 898       clib_bihash_foreach_key_value_pair_48_8 (&ip6_sv_reass_main.hash,
 899                                                ip6_rehash_cb, &ctx);
 900       if (ctx.failure)
 901         {
 902           clib_bihash_free_48_8 (&new_hash);
 903           return -1;
 904         }
 905       else
 906         {
 907           clib_bihash_free_48_8 (&ip6_sv_reass_main.hash);
 908           clib_memcpy_fast (&ip6_sv_reass_main.hash, &new_hash,
 909                             sizeof (ip6_sv_reass_main.hash));
 910           clib_bihash_copied (&ip6_sv_reass_main.hash, &new_hash);
 911         }
 912     }
 913   return 0;
 914 }
 915
 916 vnet_api_error_t
 917 ip6_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
 918                   u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
 919 {
 920   *timeout_ms = ip6_sv_reass_main.timeout_ms;
 921   *max_reassemblies = ip6_sv_reass_main.max_reass_n;
 922   *max_reassembly_length = ip6_sv_reass_main.max_reass_len;
 923   *expire_walk_interval_ms = ip6_sv_reass_main.expire_walk_interval_ms;
 924   return 0;
 925 }
 926
 927 static clib_error_t *
 928 ip6_sv_reass_init_function (vlib_main_t * vm)
 929 {
 930   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 931   clib_error_t *error = 0;
 932   u32 nbuckets;
 933   vlib_node_t *node;
 934
 935   rm->vlib_main = vm;
 936   rm->vnet_main = vnet_get_main ();
 937
 938   vec_validate (rm->per_thread_data, vlib_num_workers ());
 939   ip6_sv_reass_per_thread_t *rt;
 940   vec_foreach (rt, rm->per_thread_data)
 941   {
 942     clib_spinlock_init (&rt->lock);
 943     pool_alloc (rt->pool, rm->max_reass_n);
 944     rt->lru_first = rt->lru_last = ~0;
 945   }
 946
 947   node = vlib_get_node_by_name (vm, (u8 *) "ip6-sv-reassembly-expire-walk");
 948   ASSERT (node);
 949   rm->ip6_sv_reass_expire_node_idx = node->index;
 950
 951   ip6_sv_reass_set_params (IP6_SV_REASS_TIMEOUT_DEFAULT_MS,
 952                            IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
 953                            IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
 954                            IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
 955
 956   nbuckets = ip6_sv_reass_get_nbuckets ();
 957   clib_bihash_init_48_8 (&rm->hash, "ip6-sv-reass", nbuckets,
 958                          nbuckets * 1024);
 959
 960   node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
 961   ASSERT (node);
 962   rm->ip6_drop_idx = node->index;
 963   node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
 964   ASSERT (node);
 965   rm->ip6_icmp_error_idx = node->index;
 966
 967   if ((error = vlib_call_init_function (vm, ip_main_init)))
 968     return error;
 969
 970   rm->fq_index = vlib_frame_queue_main_init (ip6_sv_reass_node.index, 0);
 971   rm->fq_feature_index =
 972     vlib_frame_queue_main_init (ip6_sv_reass_node_feature.index, 0);
 973
 974   rm->feature_use_refcount_per_intf = NULL;
 975
 976   return error;
 977 }
 978
 979 VLIB_INIT_FUNCTION (ip6_sv_reass_init_function);
 980 #endif /* CLIB_MARCH_VARIANT */
 981
 982 static uword
 983 ip6_sv_reass_walk_expired (vlib_main_t *vm,
 984                            CLIB_UNUSED (vlib_node_runtime_t *node),
 985                            CLIB_UNUSED (vlib_frame_t *f))
 986 {
 987   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 988   uword event_type, *event_data = 0;
 989
 990   while (true)
 991     {
 992       vlib_process_wait_for_event_or_clock (vm,
 993                                             (f64) rm->expire_walk_interval_ms
 994                                             / (f64) MSEC_PER_SEC);
 995       event_type = vlib_process_get_events (vm, &event_data);
 996
 997       switch (event_type)
 998         {
 999         case ~0:
1000           /* no events => timeout */
1001           /* fallthrough */
1002         case IP6_EVENT_CONFIG_CHANGED:
1003           /* nothing to do here */
1004           break;
1005         default:
1006           clib_warning ("BUG: event type 0x%wx", event_type);
1007           break;
1008         }
1009       f64 now = vlib_time_now (vm);
1010
1011       ip6_sv_reass_t *reass;
1012       int *pool_indexes_to_free = NULL;
1013
1014       uword thread_index = 0;
1015       int index;
1016       const uword nthreads = vlib_num_workers () + 1;
1017       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1018         {
1019           ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1020           clib_spinlock_lock (&rt->lock);
1021
1022           vec_reset_length (pool_indexes_to_free);
1023           /* *INDENT-OFF* */
1024           pool_foreach_index (index, rt->pool)  {
1025                                 reass = pool_elt_at_index (rt->pool, index);
1026                                 if (now > reass->last_heard + rm->timeout)
1027                                   {
1028                                     vec_add1 (pool_indexes_to_free, index);
1029                                   }
1030                               }
1031           /* *INDENT-ON* */
1032           int *i;
1033           /* *INDENT-OFF* */
1034           vec_foreach (i, pool_indexes_to_free)
1035           {
1036             ip6_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1037             ip6_sv_reass_free (vm, rm, rt, reass);
1038           }
1039           /* *INDENT-ON* */
1040
1041           clib_spinlock_unlock (&rt->lock);
1042         }
1043
1044       vec_free (pool_indexes_to_free);
1045       if (event_data)
1046         {
1047           _vec_len (event_data) = 0;
1048         }
1049     }
1050
1051   return 0;
1052 }
1053
1054 /* *INDENT-OFF* */
1055 VLIB_REGISTER_NODE (ip6_sv_reass_expire_node) = {
1056     .function = ip6_sv_reass_walk_expired,
1057     .format_trace = format_ip6_sv_reass_trace,
1058     .type = VLIB_NODE_TYPE_PROCESS,
1059     .name = "ip6-sv-reassembly-expire-walk",
1060
1061     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
1062     .error_strings = ip6_sv_reassembly_error_strings,
1063
1064 };
1065 /* *INDENT-ON* */
1066
1067 static u8 *
1068 format_ip6_sv_reass_key (u8 * s, va_list * args)
1069 {
1070   ip6_sv_reass_key_t *key = va_arg (*args, ip6_sv_reass_key_t *);
1071   s =
1072     format (s, "fib_index: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1073             key->fib_index, format_ip6_address, &key->src, format_ip6_address,
1074             &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1075   return s;
1076 }
1077
1078 static u8 *
1079 format_ip6_sv_reass (u8 * s, va_list * args)
1080 {
1081   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1082   ip6_sv_reass_t *reass = va_arg (*args, ip6_sv_reass_t *);
1083
1084   s = format (s, "ID: %lu, key: %U, trace_op_counter: %u\n",
1085               reass->id, format_ip6_sv_reass_key, &reass->key,
1086               reass->trace_op_counter);
1087   vlib_buffer_t *b;
1088   u32 *bip;
1089   u32 counter = 0;
1090   vec_foreach (bip, reass->cached_buffers)
1091   {
1092     u32 bi = *bip;
1093     do
1094       {
1095         b = vlib_get_buffer (vm, bi);
1096         s = format (s, "  #%03u: bi: %u\n", counter, bi);
1097         ++counter;
1098         bi = b->next_buffer;
1099       }
1100     while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1101   }
1102   return s;
1103 }
1104
1105 static clib_error_t *
1106 show_ip6_sv_reass (vlib_main_t * vm, unformat_input_t * input,
1107                    CLIB_UNUSED (vlib_cli_command_t * lmd))
1108 {
1109   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1110
1111   vlib_cli_output (vm, "---------------------");
1112   vlib_cli_output (vm, "IP6 reassembly status");
1113   vlib_cli_output (vm, "---------------------");
1114   bool details = false;
1115   if (unformat (input, "details"))
1116     {
1117       details = true;
1118     }
1119
1120   u32 sum_reass_n = 0;
1121   u64 sum_buffers_n = 0;
1122   ip6_sv_reass_t *reass;
1123   uword thread_index;
1124   const uword nthreads = vlib_num_workers () + 1;
1125   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1126     {
1127       ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1128       clib_spinlock_lock (&rt->lock);
1129       if (details)
1130         {
1131           /* *INDENT-OFF* */
1132           pool_foreach (reass, rt->pool) {
1133             vlib_cli_output (vm, "%U", format_ip6_sv_reass, vm, reass);
1134           }
1135           /* *INDENT-ON* */
1136         }
1137       sum_reass_n += rt->reass_n;
1138       clib_spinlock_unlock (&rt->lock);
1139     }
1140   vlib_cli_output (vm, "---------------------");
1141   vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1142                    (long unsigned) sum_reass_n);
1143   vlib_cli_output (vm,
1144                    "Maximum configured concurrent shallow virtual IP6 reassemblies per worker-thread: %lu\n",
1145                    (long unsigned) rm->max_reass_n);
1146   vlib_cli_output (vm,
1147                    "Maximum configured amount of fragments per shallow "
1148                    "virtual IP6 reassembly: %lu\n",
1149                    (long unsigned) rm->max_reass_len);
1150   vlib_cli_output (vm,
1151                    "Maximum configured shallow virtual IP6 reassembly timeout: %lums\n",
1152                    (long unsigned) rm->timeout_ms);
1153   vlib_cli_output (vm,
1154                    "Maximum configured shallow virtual IP6 reassembly expire walk interval: %lums\n",
1155                    (long unsigned) rm->expire_walk_interval_ms);
1156   vlib_cli_output (vm, "Buffers in use: %lu\n",
1157                    (long unsigned) sum_buffers_n);
1158   return 0;
1159 }
1160
1161 /* *INDENT-OFF* */
1162 VLIB_CLI_COMMAND (show_ip6_sv_reassembly_cmd, static) = {
1163     .path = "show ip6-sv-reassembly",
1164     .short_help = "show ip6-sv-reassembly [details]",
1165     .function = show_ip6_sv_reass,
1166 };
1167 /* *INDENT-ON* */
1168
1169 #ifndef CLIB_MARCH_VARIANT
1170 vnet_api_error_t
1171 ip6_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1172 {
1173   return ip6_sv_reass_enable_disable_with_refcnt (sw_if_index,
1174                                                   enable_disable);
1175 }
1176 #endif /* CLIB_MARCH_VARIANT */
1177
1178 #define foreach_ip6_sv_reassembly_handoff_error                       \
1179 _(CONGESTION_DROP, "congestion drop")
1180
1181
1182 typedef enum
1183 {
1184 #define _(sym,str) IP6_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
1185   foreach_ip6_sv_reassembly_handoff_error
1186 #undef _
1187     IP6_SV_REASSEMBLY_HANDOFF_N_ERROR,
1188 } ip6_sv_reassembly_handoff_error_t;
1189
1190 static char *ip6_sv_reassembly_handoff_error_strings[] = {
1191 #define _(sym,string) string,
1192   foreach_ip6_sv_reassembly_handoff_error
1193 #undef _
1194 };
1195
1196 typedef struct
1197 {
1198   u32 next_worker_index;
1199 } ip6_sv_reassembly_handoff_trace_t;
1200
1201 static u8 *
1202 format_ip6_sv_reassembly_handoff_trace (u8 * s, va_list * args)
1203 {
1204   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1205   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1206   ip6_sv_reassembly_handoff_trace_t *t =
1207     va_arg (*args, ip6_sv_reassembly_handoff_trace_t *);
1208
1209   s =
1210     format (s, "ip6-sv-reassembly-handoff: next-worker %d",
1211             t->next_worker_index);
1212
1213   return s;
1214 }
1215
1216 always_inline uword
1217 ip6_sv_reassembly_handoff_inline (vlib_main_t * vm,
1218                                   vlib_node_runtime_t * node,
1219                                   vlib_frame_t * frame, bool is_feature)
1220 {
1221   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1222
1223   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1224   u32 n_enq, n_left_from, *from;
1225   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1226   u32 fq_index;
1227
1228   from = vlib_frame_vector_args (frame);
1229   n_left_from = frame->n_vectors;
1230   vlib_get_buffers (vm, from, bufs, n_left_from);
1231
1232   b = bufs;
1233   ti = thread_indices;
1234
1235   fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1236
1237   while (n_left_from > 0)
1238     {
1239       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1240
1241       if (PREDICT_FALSE
1242           ((node->flags & VLIB_NODE_FLAG_TRACE)
1243            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1244         {
1245           ip6_sv_reassembly_handoff_trace_t *t =
1246             vlib_add_trace (vm, node, b[0], sizeof (*t));
1247           t->next_worker_index = ti[0];
1248         }
1249
1250       n_left_from -= 1;
1251       ti += 1;
1252       b += 1;
1253     }
1254   n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from,
1255                                          thread_indices, frame->n_vectors, 1);
1256
1257   if (n_enq < frame->n_vectors)
1258     vlib_node_increment_counter (vm, node->node_index,
1259                                  IP6_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1260                                  frame->n_vectors - n_enq);
1261   return frame->n_vectors;
1262 }
1263
1264 VLIB_NODE_FN (ip6_sv_reassembly_handoff_node) (vlib_main_t * vm,
1265                                                vlib_node_runtime_t * node,
1266                                                vlib_frame_t * frame)
1267 {
1268   return ip6_sv_reassembly_handoff_inline (vm, node, frame,
1269                                            false /* is_feature */ );
1270 }
1271
1272 /* *INDENT-OFF* */
1273 VLIB_REGISTER_NODE (ip6_sv_reassembly_handoff_node) = {
1274   .name = "ip6-sv-reassembly-handoff",
1275   .vector_size = sizeof (u32),
1276   .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1277   .error_strings = ip6_sv_reassembly_handoff_error_strings,
1278   .format_trace = format_ip6_sv_reassembly_handoff_trace,
1279
1280   .n_next_nodes = 1,
1281
1282   .next_nodes = {
1283     [0] = "error-drop",
1284   },
1285 };
1286
1287
1288 VLIB_NODE_FN (ip6_sv_reassembly_feature_handoff_node) (vlib_main_t * vm,
1289                                vlib_node_runtime_t * node, vlib_frame_t * frame)
1290 {
1291   return ip6_sv_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1292 }
1293
1294
1295 /* *INDENT-OFF* */
1296 VLIB_REGISTER_NODE (ip6_sv_reassembly_feature_handoff_node) = {
1297   .name = "ip6-sv-reass-feature-hoff",
1298   .vector_size = sizeof (u32),
1299   .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1300   .error_strings = ip6_sv_reassembly_handoff_error_strings,
1301   .format_trace = format_ip6_sv_reassembly_handoff_trace,
1302
1303   .n_next_nodes = 1,
1304
1305   .next_nodes = {
1306     [0] = "error-drop",
1307   },
1308 };
1309 /* *INDENT-ON* */
1310
1311 #ifndef CLIB_MARCH_VARIANT
1312 int
1313 ip6_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1314 {
1315   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1316   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1317   if (is_enable)
1318     {
1319       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1320         {
1321           ++rm->feature_use_refcount_per_intf[sw_if_index];
1322           return vnet_feature_enable_disable ("ip6-unicast",
1323                                               "ip6-sv-reassembly-feature",
1324                                               sw_if_index, 1, 0, 0);
1325         }
1326       ++rm->feature_use_refcount_per_intf[sw_if_index];
1327     }
1328   else
1329     {
1330       --rm->feature_use_refcount_per_intf[sw_if_index];
1331       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1332         return vnet_feature_enable_disable ("ip6-unicast",
1333                                             "ip6-sv-reassembly-feature",
1334                                             sw_if_index, 0, 0, 0);
1335     }
1336   return 0;
1337 }
1338 #endif
1339
1340 /*
1341  * fd.io coding-style-patch-verification: ON
1342  *
1343  * Local Variables:
1344  * eval: (c-set-style "gnu")
1345  * End:
1346  */