src/vnet/ip/reass/ip4_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 IPv4 Shallow Virtual Reassembly.
  19  *
  20  * This file contains the source code for IPv4 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/ip4_to_ip6.h>
  27 #include <vppinfra/fifo.h>
  28 #include <vppinfra/bihash_16_8.h>
  29 #include <vnet/ip/reass/ip4_sv_reass.h>
  30
  31 #define MSEC_PER_SEC 1000
  32 #define IP4_SV_REASS_TIMEOUT_DEFAULT_MS 100
  33 #define IP4_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000      // 10 seconds default
  34 #define IP4_SV_REASS_MAX_REASSEMBLIES_DEFAULT 1024
  35 #define IP4_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
  36 #define IP4_SV_REASS_HT_LOAD_FACTOR (0.75)
  37
  38 typedef enum
  39 {
  40   IP4_SV_REASS_RC_OK,
  41   IP4_SV_REASS_RC_TOO_MANY_FRAGMENTS,
  42   IP4_SV_REASS_RC_UNSUPP_IP_PROTO,
  43 } ip4_sv_reass_rc_t;
  44
  45 typedef struct
  46 {
  47   union
  48   {
  49     struct
  50     {
  51       u32 xx_id;
  52       ip4_address_t src;
  53       ip4_address_t dst;
  54       u16 frag_id;
  55       u8 proto;
  56       u8 unused;
  57     };
  58     u64 as_u64[2];
  59   };
  60 } ip4_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 } ip4_sv_reass_val_t;
  71
  72 typedef union
  73 {
  74   struct
  75   {
  76     ip4_sv_reass_key_t k;
  77     ip4_sv_reass_val_t v;
  78   };
  79   clib_bihash_kv_16_8_t kv;
  80 } ip4_sv_reass_kv_t;
  81
  82 typedef struct
  83 {
  84   // hash table key
  85   ip4_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   // minimum fragment length for this reassembly - used to estimate MTU
  93   u16 min_fragment_length;
  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   u32 next_index;
 109   // lru indexes
 110   u32 lru_prev;
 111   u32 lru_next;
 112 } ip4_sv_reass_t;
 113
 114 typedef struct
 115 {
 116   ip4_sv_reass_t *pool;
 117   u32 reass_n;
 118   u32 id_counter;
 119   clib_spinlock_t lock;
 120   // lru indexes
 121   u32 lru_first;
 122   u32 lru_last;
 123
 124 } ip4_sv_reass_per_thread_t;
 125
 126 typedef struct
 127 {
 128   // IPv4 config
 129   u32 timeout_ms;
 130   f64 timeout;
 131   u32 expire_walk_interval_ms;
 132   // maximum number of fragments in one reassembly
 133   u32 max_reass_len;
 134   // maximum number of reassemblies
 135   u32 max_reass_n;
 136
 137   // IPv4 runtime
 138   clib_bihash_16_8_t hash;
 139   // per-thread data
 140   ip4_sv_reass_per_thread_t *per_thread_data;
 141
 142   // convenience
 143   vlib_main_t *vlib_main;
 144   vnet_main_t *vnet_main;
 145
 146   // node index of ip4-drop node
 147   u32 ip4_drop_idx;
 148   u32 ip4_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
 157   // reference count for enabling/disabling feature - per interface
 158   u32 *output_feature_use_refcount_per_intf;
 159
 160 } ip4_sv_reass_main_t;
 161
 162 extern ip4_sv_reass_main_t ip4_sv_reass_main;
 163
 164 #ifndef CLIB_MARCH_VARIANT
 165 ip4_sv_reass_main_t ip4_sv_reass_main;
 166 #endif /* CLIB_MARCH_VARIANT */
 167
 168 typedef enum
 169 {
 170   IP4_SV_REASSEMBLY_NEXT_INPUT,
 171   IP4_SV_REASSEMBLY_NEXT_DROP,
 172   IP4_SV_REASSEMBLY_NEXT_HANDOFF,
 173   IP4_SV_REASSEMBLY_N_NEXT,
 174 } ip4_sv_reass_next_t;
 175
 176 typedef enum
 177 {
 178   REASS_FRAGMENT_CACHE,
 179   REASS_FINISH,
 180   REASS_FRAGMENT_FORWARD,
 181   REASS_PASSTHROUGH,
 182 } ip4_sv_reass_trace_operation_e;
 183
 184 typedef struct
 185 {
 186   ip4_sv_reass_trace_operation_e action;
 187   u32 reass_id;
 188   u32 op_id;
 189   u8 ip_proto;
 190   u16 l4_src_port;
 191   u16 l4_dst_port;
 192 } ip4_sv_reass_trace_t;
 193
 194 extern vlib_node_registration_t ip4_sv_reass_node;
 195 extern vlib_node_registration_t ip4_sv_reass_node_feature;
 196
 197 static u8 *
 198 format_ip4_sv_reass_trace (u8 * s, va_list * args)
 199 {
 200   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 201   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 202   ip4_sv_reass_trace_t *t = va_arg (*args, ip4_sv_reass_trace_t *);
 203   if (REASS_PASSTHROUGH != t->action)
 204     {
 205       s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
 206     }
 207   switch (t->action)
 208     {
 209     case REASS_FRAGMENT_CACHE:
 210       s = format (s, "[cached]");
 211       break;
 212     case REASS_FINISH:
 213       s =
 214         format (s, "[finish, 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_FRAGMENT_FORWARD:
 219       s =
 220         format (s, "[forward, ip proto=%u, src_port=%u, dst_port=%u]",
 221                 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
 222                 clib_net_to_host_u16 (t->l4_dst_port));
 223       break;
 224     case REASS_PASSTHROUGH:
 225       s = format (s, "[not-fragmented]");
 226       break;
 227     }
 228   return s;
 229 }
 230
 231 static void
 232 ip4_sv_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 233                         ip4_sv_reass_main_t * rm, ip4_sv_reass_t * reass,
 234                         u32 bi, ip4_sv_reass_trace_operation_e action,
 235                         u32 ip_proto, u16 l4_src_port, u16 l4_dst_port)
 236 {
 237   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 238   ip4_sv_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 239   if (reass)
 240     {
 241       t->reass_id = reass->id;
 242       t->op_id = reass->trace_op_counter;
 243       ++reass->trace_op_counter;
 244     }
 245   t->action = action;
 246   t->ip_proto = ip_proto;
 247   t->l4_src_port = l4_src_port;
 248   t->l4_dst_port = l4_dst_port;
 249 #if 0
 250   static u8 *s = NULL;
 251   s = format (s, "%U", format_ip4_sv_reass_trace, NULL, NULL, t);
 252   printf ("%.*s\n", vec_len (s), s);
 253   fflush (stdout);
 254   vec_reset_length (s);
 255 #endif
 256 }
 257
 258
 259 always_inline void
 260 ip4_sv_reass_free (vlib_main_t * vm, ip4_sv_reass_main_t * rm,
 261                    ip4_sv_reass_per_thread_t * rt, ip4_sv_reass_t * reass)
 262 {
 263   clib_bihash_kv_16_8_t kv;
 264   kv.key[0] = reass->key.as_u64[0];
 265   kv.key[1] = reass->key.as_u64[1];
 266   clib_bihash_add_del_16_8 (&rm->hash, &kv, 0);
 267   vlib_buffer_free (vm, reass->cached_buffers,
 268                     vec_len (reass->cached_buffers));
 269   vec_free (reass->cached_buffers);
 270   reass->cached_buffers = NULL;
 271   if (~0 != reass->lru_prev)
 272     {
 273       ip4_sv_reass_t *lru_prev =
 274         pool_elt_at_index (rt->pool, reass->lru_prev);
 275       lru_prev->lru_next = reass->lru_next;
 276     }
 277   if (~0 != reass->lru_next)
 278     {
 279       ip4_sv_reass_t *lru_next =
 280         pool_elt_at_index (rt->pool, reass->lru_next);
 281       lru_next->lru_prev = reass->lru_prev;
 282     }
 283   if (rt->lru_first == reass - rt->pool)
 284     {
 285       rt->lru_first = reass->lru_next;
 286     }
 287   if (rt->lru_last == reass - rt->pool)
 288     {
 289       rt->lru_last = reass->lru_prev;
 290     }
 291   pool_put (rt->pool, reass);
 292   --rt->reass_n;
 293 }
 294
 295 always_inline void
 296 ip4_sv_reass_init (ip4_sv_reass_t * reass)
 297 {
 298   reass->cached_buffers = NULL;
 299   reass->is_complete = false;
 300 }
 301
 302 always_inline ip4_sv_reass_t *
 303 ip4_sv_reass_find_or_create (vlib_main_t * vm, ip4_sv_reass_main_t * rm,
 304                              ip4_sv_reass_per_thread_t * rt,
 305                              ip4_sv_reass_kv_t * kv, u8 * do_handoff)
 306 {
 307   ip4_sv_reass_t *reass = NULL;
 308   f64 now = vlib_time_now (vm);
 309
 310   if (!clib_bihash_search_16_8 (&rm->hash, &kv->kv, &kv->kv))
 311     {
 312       if (vm->thread_index != kv->v.thread_index)
 313         {
 314           *do_handoff = 1;
 315           return NULL;
 316         }
 317       reass = pool_elt_at_index (rt->pool, kv->v.reass_index);
 318
 319       if (now > reass->last_heard + rm->timeout)
 320         {
 321           ip4_sv_reass_free (vm, rm, rt, reass);
 322           reass = NULL;
 323         }
 324     }
 325
 326   if (reass)
 327     {
 328       reass->last_heard = now;
 329       return reass;
 330     }
 331
 332   if (rt->reass_n >= rm->max_reass_n && rm->max_reass_n)
 333     {
 334       reass = pool_elt_at_index (rt->pool, rt->lru_first);
 335       ip4_sv_reass_free (vm, rm, rt, reass);
 336     }
 337
 338   pool_get (rt->pool, reass);
 339   clib_memset (reass, 0, sizeof (*reass));
 340   reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 341   ++rt->id_counter;
 342   ip4_sv_reass_init (reass);
 343   ++rt->reass_n;
 344   reass->lru_prev = reass->lru_next = ~0;
 345
 346   if (~0 != rt->lru_last)
 347     {
 348       ip4_sv_reass_t *lru_last = pool_elt_at_index (rt->pool, rt->lru_last);
 349       reass->lru_prev = rt->lru_last;
 350       lru_last->lru_next = rt->lru_last = reass - rt->pool;
 351     }
 352
 353   if (~0 == rt->lru_first)
 354     {
 355       rt->lru_first = rt->lru_last = reass - rt->pool;
 356     }
 357
 358   reass->key.as_u64[0] = kv->kv.key[0];
 359   reass->key.as_u64[1] = kv->kv.key[1];
 360   kv->v.reass_index = (reass - rt->pool);
 361   kv->v.thread_index = vm->thread_index;
 362   reass->last_heard = now;
 363
 364   if (clib_bihash_add_del_16_8 (&rm->hash, &kv->kv, 1))
 365     {
 366       ip4_sv_reass_free (vm, rm, rt, reass);
 367       reass = NULL;
 368     }
 369
 370   return reass;
 371 }
 372
 373 always_inline ip4_sv_reass_rc_t
 374 ip4_sv_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 375                      ip4_sv_reass_main_t * rm, ip4_sv_reass_per_thread_t * rt,
 376                      ip4_header_t * ip0, ip4_sv_reass_t * reass, u32 bi0)
 377 {
 378   vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
 379   ip4_sv_reass_rc_t rc = IP4_SV_REASS_RC_OK;
 380   const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
 381   if (0 == fragment_first)
 382     {
 383       reass->ip_proto = ip0->protocol;
 384       reass->l4_src_port = ip4_get_port (ip0, 1);
 385       reass->l4_dst_port = ip4_get_port (ip0, 0);
 386       if (!reass->l4_src_port || !reass->l4_dst_port)
 387         return IP4_SV_REASS_RC_UNSUPP_IP_PROTO;
 388       if (IP_PROTOCOL_TCP == reass->ip_proto)
 389         {
 390           reass->icmp_type_or_tcp_flags = ((tcp_header_t *) (ip0 + 1))->flags;
 391           reass->tcp_ack_number = ((tcp_header_t *) (ip0 + 1))->ack_number;
 392           reass->tcp_seq_number = ((tcp_header_t *) (ip0 + 1))->seq_number;
 393         }
 394       else if (IP_PROTOCOL_ICMP == reass->ip_proto)
 395         {
 396           reass->icmp_type_or_tcp_flags =
 397             ((icmp46_header_t *) (ip0 + 1))->type;
 398         }
 399       reass->is_complete = true;
 400       vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
 401       if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 402         {
 403           ip4_sv_reass_add_trace (vm, node, rm, reass, bi0, REASS_FINISH,
 404                                   reass->ip_proto, reass->l4_src_port,
 405                                   reass->l4_dst_port);
 406         }
 407     }
 408   vec_add1 (reass->cached_buffers, bi0);
 409   if (!reass->is_complete)
 410     {
 411       if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 412         {
 413           ip4_sv_reass_add_trace (vm, node, rm, reass, bi0,
 414                                   REASS_FRAGMENT_CACHE, ~0, ~0, ~0);
 415         }
 416       if (vec_len (reass->cached_buffers) > rm->max_reass_len)
 417         {
 418           rc = IP4_SV_REASS_RC_TOO_MANY_FRAGMENTS;
 419         }
 420     }
 421   return rc;
 422 }
 423
 424 always_inline uword
 425 ip4_sv_reass_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 426                      vlib_frame_t * frame, bool is_feature,
 427                      bool is_output_feature, bool is_custom)
 428 {
 429   u32 *from = vlib_frame_vector_args (frame);
 430   u32 n_left_from, n_left_to_next, *to_next, next_index;
 431   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
 432   ip4_sv_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
 433   clib_spinlock_lock (&rt->lock);
 434
 435   n_left_from = frame->n_vectors;
 436   next_index = node->cached_next_index;
 437
 438   while (n_left_from > 0)
 439     {
 440       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 441
 442       while (n_left_from > 0 && n_left_to_next > 0)
 443         {
 444           u32 bi0;
 445           vlib_buffer_t *b0;
 446           u32 next0;
 447           u32 error0 = IP4_ERROR_NONE;
 448
 449           bi0 = from[0];
 450           b0 = vlib_get_buffer (vm, bi0);
 451
 452           ip4_header_t *ip0 =
 453             (ip4_header_t *) u8_ptr_add (vlib_buffer_get_current (b0),
 454                                          (is_output_feature ? 1 : 0) *
 455                                          vnet_buffer (b0)->
 456                                          ip.save_rewrite_length);
 457           if (!ip4_get_fragment_more (ip0) && !ip4_get_fragment_offset (ip0))
 458             {
 459               // this is a regular packet - no fragmentation
 460               if (is_custom)
 461                 {
 462                   next0 = vnet_buffer (b0)->ip.reass.next_index;
 463                 }
 464               else
 465                 {
 466                   next0 = IP4_SV_REASSEMBLY_NEXT_INPUT;
 467                 }
 468               vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
 469               vnet_buffer (b0)->ip.reass.ip_proto = ip0->protocol;
 470               if (IP_PROTOCOL_TCP == ip0->protocol)
 471                 {
 472                   vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 473                     ((tcp_header_t *) (ip0 + 1))->flags;
 474                   vnet_buffer (b0)->ip.reass.tcp_ack_number =
 475                     ((tcp_header_t *) (ip0 + 1))->ack_number;
 476                   vnet_buffer (b0)->ip.reass.tcp_seq_number =
 477                     ((tcp_header_t *) (ip0 + 1))->seq_number;
 478                 }
 479               else if (IP_PROTOCOL_ICMP == ip0->protocol)
 480                 {
 481                   vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 482                     ((icmp46_header_t *) (ip0 + 1))->type;
 483                 }
 484               vnet_buffer (b0)->ip.reass.l4_src_port = ip4_get_port (ip0, 1);
 485               vnet_buffer (b0)->ip.reass.l4_dst_port = ip4_get_port (ip0, 0);
 486               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 487                 {
 488                   ip4_sv_reass_add_trace (vm, node, rm, NULL, bi0,
 489                                           REASS_PASSTHROUGH,
 490                                           vnet_buffer (b0)->ip.reass.ip_proto,
 491                                           vnet_buffer (b0)->ip.
 492                                           reass.l4_src_port,
 493                                           vnet_buffer (b0)->ip.
 494                                           reass.l4_dst_port);
 495                 }
 496               goto packet_enqueue;
 497             }
 498           const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
 499           const u32 fragment_length =
 500             clib_net_to_host_u16 (ip0->length) - ip4_header_bytes (ip0);
 501           const u32 fragment_last = fragment_first + fragment_length - 1;
 502           if (fragment_first > fragment_last || fragment_first + fragment_length > UINT16_MAX - 20 || (fragment_length < 8 && ip4_get_fragment_more (ip0)))     // 8 is minimum frag length per RFC 791
 503             {
 504               next0 = IP4_SV_REASSEMBLY_NEXT_DROP;
 505               error0 = IP4_ERROR_REASS_MALFORMED_PACKET;
 506               b0->error = node->errors[error0];
 507               goto packet_enqueue;
 508             }
 509           ip4_sv_reass_kv_t kv;
 510           u8 do_handoff = 0;
 511
 512           kv.k.as_u64[0] =
 513             (u64) vec_elt (ip4_main.fib_index_by_sw_if_index,
 514                            vnet_buffer (b0)->sw_if_index[VLIB_RX]) |
 515             (u64) ip0->src_address.as_u32 << 32;
 516           kv.k.as_u64[1] =
 517             (u64) ip0->dst_address.
 518             as_u32 | (u64) ip0->fragment_id << 32 | (u64) ip0->protocol << 48;
 519
 520           ip4_sv_reass_t *reass =
 521             ip4_sv_reass_find_or_create (vm, rm, rt, &kv, &do_handoff);
 522
 523           if (PREDICT_FALSE (do_handoff))
 524             {
 525               next0 = IP4_SV_REASSEMBLY_NEXT_HANDOFF;
 526               vnet_buffer (b0)->ip.reass.owner_thread_index =
 527                 kv.v.thread_index;
 528               goto packet_enqueue;
 529             }
 530
 531           if (!reass)
 532             {
 533               next0 = IP4_SV_REASSEMBLY_NEXT_DROP;
 534               error0 = IP4_ERROR_REASS_LIMIT_REACHED;
 535               b0->error = node->errors[error0];
 536               goto packet_enqueue;
 537             }
 538
 539           if (reass->is_complete)
 540             {
 541               if (is_custom)
 542                 {
 543                   next0 = vnet_buffer (b0)->ip.reass.next_index;
 544                 }
 545               else
 546                 {
 547                   next0 = IP4_SV_REASSEMBLY_NEXT_INPUT;
 548                 }
 549               vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 550                 ! !fragment_first;
 551               vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 552               vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 553                 reass->icmp_type_or_tcp_flags;
 554               vnet_buffer (b0)->ip.reass.tcp_ack_number =
 555                 reass->tcp_ack_number;
 556               vnet_buffer (b0)->ip.reass.tcp_seq_number =
 557                 reass->tcp_seq_number;
 558               vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 559               vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 560               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 561                 {
 562                   ip4_sv_reass_add_trace (vm, node, rm, reass, bi0,
 563                                           REASS_FRAGMENT_FORWARD,
 564                                           reass->ip_proto,
 565                                           reass->l4_src_port,
 566                                           reass->l4_dst_port);
 567                 }
 568               goto packet_enqueue;
 569             }
 570
 571           ip4_sv_reass_rc_t rc =
 572             ip4_sv_reass_update (vm, node, rm, rt, ip0, reass, bi0);
 573           switch (rc)
 574             {
 575             case IP4_SV_REASS_RC_OK:
 576               /* nothing to do here */
 577               break;
 578             case IP4_SV_REASS_RC_TOO_MANY_FRAGMENTS:
 579               vlib_node_increment_counter (vm, node->node_index,
 580                                            IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
 581                                            1);
 582               ip4_sv_reass_free (vm, rm, rt, reass);
 583               goto next_packet;
 584               break;
 585             case IP4_SV_REASS_RC_UNSUPP_IP_PROTO:
 586               vlib_node_increment_counter (vm, node->node_index,
 587                                            IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
 588                                            1);
 589               ip4_sv_reass_free (vm, rm, rt, reass);
 590               goto next_packet;
 591               break;
 592             }
 593           if (reass->is_complete)
 594             {
 595               u32 idx;
 596               vec_foreach_index (idx, reass->cached_buffers)
 597               {
 598                 u32 bi0 = vec_elt (reass->cached_buffers, idx);
 599                 vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
 600                 ip0 =
 601                   (ip4_header_t *) u8_ptr_add (vlib_buffer_get_current (b0),
 602                                                (is_output_feature ? 1 : 0) *
 603                                                vnet_buffer (b0)->
 604                                                ip.save_rewrite_length);
 605                 u32 next0 = IP4_SV_REASSEMBLY_NEXT_INPUT;
 606                 if (is_feature)
 607                   {
 608                     vnet_feature_next (&next0, b0);
 609                   }
 610                 if (is_custom)
 611                   {
 612                     next0 = vnet_buffer (b0)->ip.reass.next_index;
 613                   }
 614                 if (0 == n_left_to_next)
 615                   {
 616                     vlib_put_next_frame (vm, node, next_index,
 617                                          n_left_to_next);
 618                     vlib_get_next_frame (vm, node, next_index, to_next,
 619                                          n_left_to_next);
 620                   }
 621                 to_next[0] = bi0;
 622                 to_next += 1;
 623                 n_left_to_next -= 1;
 624                 vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 625                   ! !ip4_get_fragment_offset (ip0);
 626                 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 627                 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 628                   reass->icmp_type_or_tcp_flags;
 629                 vnet_buffer (b0)->ip.reass.tcp_ack_number =
 630                   reass->tcp_ack_number;
 631                 vnet_buffer (b0)->ip.reass.tcp_seq_number =
 632                   reass->tcp_seq_number;
 633                 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 634                 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 635                 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 636                   {
 637                     ip4_sv_reass_add_trace (vm, node, rm, reass, bi0,
 638                                             REASS_FRAGMENT_FORWARD,
 639                                             reass->ip_proto,
 640                                             reass->l4_src_port,
 641                                             reass->l4_dst_port);
 642                   }
 643                 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 644                                                  to_next, n_left_to_next, bi0,
 645                                                  next0);
 646               }
 647               _vec_len (reass->cached_buffers) = 0;     // buffers are owned by frame now
 648             }
 649           goto next_packet;
 650
 651         packet_enqueue:
 652           to_next[0] = bi0;
 653           to_next += 1;
 654           n_left_to_next -= 1;
 655           if (is_feature && IP4_ERROR_NONE == error0)
 656             {
 657               b0 = vlib_get_buffer (vm, bi0);
 658               vnet_feature_next (&next0, b0);
 659             }
 660           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 661                                            to_next, n_left_to_next,
 662                                            bi0, next0);
 663
 664         next_packet:
 665           from += 1;
 666           n_left_from -= 1;
 667         }
 668
 669       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 670     }
 671
 672   clib_spinlock_unlock (&rt->lock);
 673   return frame->n_vectors;
 674 }
 675
 676 static char *ip4_sv_reass_error_strings[] = {
 677 #define _(sym, string) string,
 678   foreach_ip4_error
 679 #undef _
 680 };
 681
 682 VLIB_NODE_FN (ip4_sv_reass_node) (vlib_main_t * vm,
 683                                   vlib_node_runtime_t * node,
 684                                   vlib_frame_t * frame)
 685 {
 686   return ip4_sv_reass_inline (vm, node, frame, false /* is_feature */ ,
 687                               false /* is_output_feature */ ,
 688                               false /* is_custom */ );
 689 }
 690
 691 /* *INDENT-OFF* */
 692 VLIB_REGISTER_NODE (ip4_sv_reass_node) = {
 693     .name = "ip4-sv-reassembly",
 694     .vector_size = sizeof (u32),
 695     .format_trace = format_ip4_sv_reass_trace,
 696     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
 697     .error_strings = ip4_sv_reass_error_strings,
 698     .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
 699     .next_nodes =
 700         {
 701                 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
 702                 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
 703                 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reassembly-handoff",
 704
 705         },
 706 };
 707 /* *INDENT-ON* */
 708
 709 VLIB_NODE_FN (ip4_sv_reass_node_feature) (vlib_main_t * vm,
 710                                           vlib_node_runtime_t * node,
 711                                           vlib_frame_t * frame)
 712 {
 713   return ip4_sv_reass_inline (vm, node, frame, true /* is_feature */ ,
 714                               false /* is_output_feature */ ,
 715                               false /* is_custom */ );
 716 }
 717
 718 /* *INDENT-OFF* */
 719 VLIB_REGISTER_NODE (ip4_sv_reass_node_feature) = {
 720     .name = "ip4-sv-reassembly-feature",
 721     .vector_size = sizeof (u32),
 722     .format_trace = format_ip4_sv_reass_trace,
 723     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
 724     .error_strings = ip4_sv_reass_error_strings,
 725     .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
 726     .next_nodes =
 727         {
 728                 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
 729                 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
 730                 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reass-feature-hoff",
 731         },
 732 };
 733 /* *INDENT-ON* */
 734
 735 /* *INDENT-OFF* */
 736 VNET_FEATURE_INIT (ip4_sv_reass_feature) = {
 737     .arc_name = "ip4-unicast",
 738     .node_name = "ip4-sv-reassembly-feature",
 739     .runs_before = VNET_FEATURES ("ip4-lookup"),
 740     .runs_after = 0,
 741 };
 742 /* *INDENT-ON* */
 743
 744 VLIB_NODE_FN (ip4_sv_reass_node_output_feature) (vlib_main_t * vm,
 745                                                  vlib_node_runtime_t * node,
 746                                                  vlib_frame_t * frame)
 747 {
 748   return ip4_sv_reass_inline (vm, node, frame, true /* is_feature */ ,
 749                               true /* is_output_feature */ ,
 750                               false /* is_custom */ );
 751 }
 752
 753
 754 /* *INDENT-OFF* */
 755 VLIB_REGISTER_NODE (ip4_sv_reass_node_output_feature) = {
 756     .name = "ip4-sv-reassembly-output-feature",
 757     .vector_size = sizeof (u32),
 758     .format_trace = format_ip4_sv_reass_trace,
 759     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
 760     .error_strings = ip4_sv_reass_error_strings,
 761     .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
 762     .next_nodes =
 763         {
 764                 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
 765                 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
 766                 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reass-feature-hoff",
 767         },
 768 };
 769 /* *INDENT-ON* */
 770
 771 /* *INDENT-OFF* */
 772 VNET_FEATURE_INIT (ip4_sv_reass_output_feature) = {
 773     .arc_name = "ip4-output",
 774     .node_name = "ip4-sv-reassembly-output-feature",
 775     .runs_before = 0,
 776     .runs_after = 0,
 777 };
 778 /* *INDENT-ON* */
 779
 780 /* *INDENT-OFF* */
 781 VLIB_REGISTER_NODE (ip4_sv_reass_custom_node) = {
 782     .name = "ip4-sv-reassembly-custom-next",
 783     .vector_size = sizeof (u32),
 784     .format_trace = format_ip4_sv_reass_trace,
 785     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
 786     .error_strings = ip4_sv_reass_error_strings,
 787     .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
 788     .next_nodes =
 789         {
 790                 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
 791                 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
 792                 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reassembly-handoff",
 793
 794         },
 795 };
 796 /* *INDENT-ON* */
 797
 798 VLIB_NODE_FN (ip4_sv_reass_custom_node) (vlib_main_t * vm,
 799                                          vlib_node_runtime_t * node,
 800                                          vlib_frame_t * frame)
 801 {
 802   return ip4_sv_reass_inline (vm, node, frame, false /* is_feature */ ,
 803                               false /* is_output_feature */ ,
 804                               true /* is_custom */ );
 805 }
 806
 807 #ifndef CLIB_MARCH_VARIANT
 808 always_inline u32
 809 ip4_sv_reass_get_nbuckets ()
 810 {
 811   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
 812   u32 nbuckets;
 813   u8 i;
 814
 815   nbuckets = (u32) (rm->max_reass_n / IP4_SV_REASS_HT_LOAD_FACTOR);
 816
 817   for (i = 0; i < 31; i++)
 818     if ((1 << i) >= nbuckets)
 819       break;
 820   nbuckets = 1 << i;
 821
 822   return nbuckets;
 823 }
 824 #endif /* CLIB_MARCH_VARIANT */
 825
 826 typedef enum
 827 {
 828   IP4_EVENT_CONFIG_CHANGED = 1,
 829 } ip4_sv_reass_event_t;
 830
 831 typedef struct
 832 {
 833   int failure;
 834   clib_bihash_16_8_t *new_hash;
 835 } ip4_rehash_cb_ctx;
 836
 837 #ifndef CLIB_MARCH_VARIANT
 838 static int
 839 ip4_rehash_cb (clib_bihash_kv_16_8_t * kv, void *_ctx)
 840 {
 841   ip4_rehash_cb_ctx *ctx = _ctx;
 842   if (clib_bihash_add_del_16_8 (ctx->new_hash, kv, 1))
 843     {
 844       ctx->failure = 1;
 845     }
 846   return (BIHASH_WALK_CONTINUE);
 847 }
 848
 849 static void
 850 ip4_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
 851                          u32 max_reassembly_length,
 852                          u32 expire_walk_interval_ms)
 853 {
 854   ip4_sv_reass_main.timeout_ms = timeout_ms;
 855   ip4_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
 856   ip4_sv_reass_main.max_reass_n = max_reassemblies;
 857   ip4_sv_reass_main.max_reass_len = max_reassembly_length;
 858   ip4_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
 859 }
 860
 861 vnet_api_error_t
 862 ip4_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
 863                   u32 max_reassembly_length, u32 expire_walk_interval_ms)
 864 {
 865   u32 old_nbuckets = ip4_sv_reass_get_nbuckets ();
 866   ip4_sv_reass_set_params (timeout_ms, max_reassemblies,
 867                            max_reassembly_length, expire_walk_interval_ms);
 868   vlib_process_signal_event (ip4_sv_reass_main.vlib_main,
 869                              ip4_sv_reass_main.ip4_sv_reass_expire_node_idx,
 870                              IP4_EVENT_CONFIG_CHANGED, 0);
 871   u32 new_nbuckets = ip4_sv_reass_get_nbuckets ();
 872   if (ip4_sv_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
 873     {
 874       clib_bihash_16_8_t new_hash;
 875       clib_memset (&new_hash, 0, sizeof (new_hash));
 876       ip4_rehash_cb_ctx ctx;
 877       ctx.failure = 0;
 878       ctx.new_hash = &new_hash;
 879       clib_bihash_init_16_8 (&new_hash, "ip4-dr", new_nbuckets,
 880                              new_nbuckets * 1024);
 881       clib_bihash_foreach_key_value_pair_16_8 (&ip4_sv_reass_main.hash,
 882                                                ip4_rehash_cb, &ctx);
 883       if (ctx.failure)
 884         {
 885           clib_bihash_free_16_8 (&new_hash);
 886           return -1;
 887         }
 888       else
 889         {
 890           clib_bihash_free_16_8 (&ip4_sv_reass_main.hash);
 891           clib_memcpy_fast (&ip4_sv_reass_main.hash, &new_hash,
 892                             sizeof (ip4_sv_reass_main.hash));
 893           clib_bihash_copied (&ip4_sv_reass_main.hash, &new_hash);
 894         }
 895     }
 896   return 0;
 897 }
 898
 899 vnet_api_error_t
 900 ip4_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
 901                   u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
 902 {
 903   *timeout_ms = ip4_sv_reass_main.timeout_ms;
 904   *max_reassemblies = ip4_sv_reass_main.max_reass_n;
 905   *max_reassembly_length = ip4_sv_reass_main.max_reass_len;
 906   *expire_walk_interval_ms = ip4_sv_reass_main.expire_walk_interval_ms;
 907   return 0;
 908 }
 909
 910 static clib_error_t *
 911 ip4_sv_reass_init_function (vlib_main_t * vm)
 912 {
 913   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
 914   clib_error_t *error = 0;
 915   u32 nbuckets;
 916   vlib_node_t *node;
 917
 918   rm->vlib_main = vm;
 919   rm->vnet_main = vnet_get_main ();
 920
 921   vec_validate (rm->per_thread_data, vlib_num_workers ());
 922   ip4_sv_reass_per_thread_t *rt;
 923   vec_foreach (rt, rm->per_thread_data)
 924   {
 925     clib_spinlock_init (&rt->lock);
 926     pool_alloc (rt->pool, rm->max_reass_n);
 927     rt->lru_first = rt->lru_last = ~0;
 928   }
 929
 930   node = vlib_get_node_by_name (vm, (u8 *) "ip4-sv-reassembly-expire-walk");
 931   ASSERT (node);
 932   rm->ip4_sv_reass_expire_node_idx = node->index;
 933
 934   ip4_sv_reass_set_params (IP4_SV_REASS_TIMEOUT_DEFAULT_MS,
 935                            IP4_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
 936                            IP4_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
 937                            IP4_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
 938
 939   nbuckets = ip4_sv_reass_get_nbuckets ();
 940   clib_bihash_init_16_8 (&rm->hash, "ip4-dr", nbuckets, nbuckets * 1024);
 941
 942   node = vlib_get_node_by_name (vm, (u8 *) "ip4-drop");
 943   ASSERT (node);
 944   rm->ip4_drop_idx = node->index;
 945
 946   rm->fq_index = vlib_frame_queue_main_init (ip4_sv_reass_node.index, 0);
 947   rm->fq_feature_index =
 948     vlib_frame_queue_main_init (ip4_sv_reass_node_feature.index, 0);
 949
 950   rm->feature_use_refcount_per_intf = NULL;
 951   rm->output_feature_use_refcount_per_intf = NULL;
 952
 953   return error;
 954 }
 955
 956 VLIB_INIT_FUNCTION (ip4_sv_reass_init_function);
 957 #endif /* CLIB_MARCH_VARIANT */
 958
 959 static uword
 960 ip4_sv_reass_walk_expired (vlib_main_t * vm,
 961                            vlib_node_runtime_t * node, vlib_frame_t * f)
 962 {
 963   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
 964   uword event_type, *event_data = 0;
 965
 966   while (true)
 967     {
 968       vlib_process_wait_for_event_or_clock (vm,
 969                                             (f64)
 970                                             rm->expire_walk_interval_ms /
 971                                             (f64) MSEC_PER_SEC);
 972       event_type = vlib_process_get_events (vm, &event_data);
 973
 974       switch (event_type)
 975         {
 976         case ~0:                /* no events => timeout */
 977           /* nothing to do here */
 978           break;
 979         case IP4_EVENT_CONFIG_CHANGED:
 980           break;
 981         default:
 982           clib_warning ("BUG: event type 0x%wx", event_type);
 983           break;
 984         }
 985       f64 now = vlib_time_now (vm);
 986
 987       ip4_sv_reass_t *reass;
 988       int *pool_indexes_to_free = NULL;
 989
 990       uword thread_index = 0;
 991       int index;
 992       const uword nthreads = vlib_num_workers () + 1;
 993       for (thread_index = 0; thread_index < nthreads; ++thread_index)
 994         {
 995           ip4_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
 996           clib_spinlock_lock (&rt->lock);
 997
 998           vec_reset_length (pool_indexes_to_free);
 999           /* *INDENT-OFF* */
1000           pool_foreach_index (index, rt->pool, ({
1001                                 reass = pool_elt_at_index (rt->pool, index);
1002                                 if (now > reass->last_heard + rm->timeout)
1003                                   {
1004                                     vec_add1 (pool_indexes_to_free, index);
1005                                   }
1006                               }));
1007           /* *INDENT-ON* */
1008           int *i;
1009           /* *INDENT-OFF* */
1010           vec_foreach (i, pool_indexes_to_free)
1011           {
1012             ip4_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1013             ip4_sv_reass_free (vm, rm, rt, reass);
1014           }
1015           /* *INDENT-ON* */
1016
1017           clib_spinlock_unlock (&rt->lock);
1018         }
1019
1020       vec_free (pool_indexes_to_free);
1021       if (event_data)
1022         {
1023           _vec_len (event_data) = 0;
1024         }
1025     }
1026
1027   return 0;
1028 }
1029
1030 /* *INDENT-OFF* */
1031 VLIB_REGISTER_NODE (ip4_sv_reass_expire_node) = {
1032     .function = ip4_sv_reass_walk_expired,
1033     .type = VLIB_NODE_TYPE_PROCESS,
1034     .name = "ip4-sv-reassembly-expire-walk",
1035     .format_trace = format_ip4_sv_reass_trace,
1036     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
1037     .error_strings = ip4_sv_reass_error_strings,
1038
1039 };
1040 /* *INDENT-ON* */
1041
1042 static u8 *
1043 format_ip4_sv_reass_key (u8 * s, va_list * args)
1044 {
1045   ip4_sv_reass_key_t *key = va_arg (*args, ip4_sv_reass_key_t *);
1046   s =
1047     format (s,
1048             "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1049             key->xx_id, format_ip4_address, &key->src, format_ip4_address,
1050             &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1051   return s;
1052 }
1053
1054 static u8 *
1055 format_ip4_sv_reass (u8 * s, va_list * args)
1056 {
1057   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1058   ip4_sv_reass_t *reass = va_arg (*args, ip4_sv_reass_t *);
1059
1060   s = format (s, "ID: %lu, key: %U trace_op_counter: %u\n",
1061               reass->id, format_ip4_sv_reass_key, &reass->key,
1062               reass->trace_op_counter);
1063
1064   vlib_buffer_t *b;
1065   u32 *bip;
1066   u32 counter = 0;
1067   vec_foreach (bip, reass->cached_buffers)
1068   {
1069     u32 bi = *bip;
1070     do
1071       {
1072         b = vlib_get_buffer (vm, bi);
1073         s = format (s, "  #%03u: bi: %u, ", counter, bi);
1074         ++counter;
1075         bi = b->next_buffer;
1076       }
1077     while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1078   }
1079   return s;
1080 }
1081
1082 static clib_error_t *
1083 show_ip4_reass (vlib_main_t * vm,
1084                 unformat_input_t * input,
1085                 CLIB_UNUSED (vlib_cli_command_t * lmd))
1086 {
1087   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1088
1089   vlib_cli_output (vm, "---------------------");
1090   vlib_cli_output (vm, "IP4 reassembly status");
1091   vlib_cli_output (vm, "---------------------");
1092   bool details = false;
1093   if (unformat (input, "details"))
1094     {
1095       details = true;
1096     }
1097
1098   u32 sum_reass_n = 0;
1099   ip4_sv_reass_t *reass;
1100   uword thread_index;
1101   const uword nthreads = vlib_num_workers () + 1;
1102   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1103     {
1104       ip4_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1105       clib_spinlock_lock (&rt->lock);
1106       if (details)
1107         {
1108           /* *INDENT-OFF* */
1109           pool_foreach (reass, rt->pool, {
1110             vlib_cli_output (vm, "%U", format_ip4_sv_reass, vm, reass);
1111           });
1112           /* *INDENT-ON* */
1113         }
1114       sum_reass_n += rt->reass_n;
1115       clib_spinlock_unlock (&rt->lock);
1116     }
1117   vlib_cli_output (vm, "---------------------");
1118   vlib_cli_output (vm, "Current IP4 reassemblies count: %lu\n",
1119                    (long unsigned) sum_reass_n);
1120   vlib_cli_output (vm,
1121                    "Maximum configured concurrent shallow virtual IP4 reassemblies per worker-thread: %lu\n",
1122                    (long unsigned) rm->max_reass_n);
1123   vlib_cli_output (vm,
1124                    "Maximum configured shallow virtual IP4 reassembly timeout: %lums\n",
1125                    (long unsigned) rm->timeout_ms);
1126   vlib_cli_output (vm,
1127                    "Maximum configured shallow virtual IP4 reassembly expire walk interval: %lums\n",
1128                    (long unsigned) rm->expire_walk_interval_ms);
1129   return 0;
1130 }
1131
1132 /* *INDENT-OFF* */
1133 VLIB_CLI_COMMAND (show_ip4_sv_reass_cmd, static) = {
1134     .path = "show ip4-sv-reassembly",
1135     .short_help = "show ip4-sv-reassembly [details]",
1136     .function = show_ip4_reass,
1137 };
1138 /* *INDENT-ON* */
1139
1140 #ifndef CLIB_MARCH_VARIANT
1141 vnet_api_error_t
1142 ip4_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1143 {
1144   return ip4_sv_reass_enable_disable_with_refcnt (sw_if_index,
1145                                                   enable_disable);
1146 }
1147 #endif /* CLIB_MARCH_VARIANT */
1148
1149
1150 #define foreach_ip4_sv_reass_handoff_error                       \
1151 _(CONGESTION_DROP, "congestion drop")
1152
1153
1154 typedef enum
1155 {
1156 #define _(sym,str) IP4_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
1157   foreach_ip4_sv_reass_handoff_error
1158 #undef _
1159     IP4_SV_REASSEMBLY_HANDOFF_N_ERROR,
1160 } ip4_sv_reass_handoff_error_t;
1161
1162 static char *ip4_sv_reass_handoff_error_strings[] = {
1163 #define _(sym,string) string,
1164   foreach_ip4_sv_reass_handoff_error
1165 #undef _
1166 };
1167
1168 typedef struct
1169 {
1170   u32 next_worker_index;
1171 } ip4_sv_reass_handoff_trace_t;
1172
1173 static u8 *
1174 format_ip4_sv_reass_handoff_trace (u8 * s, va_list * args)
1175 {
1176   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1177   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1178   ip4_sv_reass_handoff_trace_t *t =
1179     va_arg (*args, ip4_sv_reass_handoff_trace_t *);
1180
1181   s =
1182     format (s, "ip4-sv-reassembly-handoff: next-worker %d",
1183             t->next_worker_index);
1184
1185   return s;
1186 }
1187
1188 always_inline uword
1189 ip4_sv_reass_handoff_node_inline (vlib_main_t * vm,
1190                                   vlib_node_runtime_t * node,
1191                                   vlib_frame_t * frame, bool is_feature)
1192 {
1193   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1194
1195   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1196   u32 n_enq, n_left_from, *from;
1197   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1198   u32 fq_index;
1199
1200   from = vlib_frame_vector_args (frame);
1201   n_left_from = frame->n_vectors;
1202   vlib_get_buffers (vm, from, bufs, n_left_from);
1203
1204   b = bufs;
1205   ti = thread_indices;
1206
1207   fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1208
1209   while (n_left_from > 0)
1210     {
1211       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1212
1213       if (PREDICT_FALSE
1214           ((node->flags & VLIB_NODE_FLAG_TRACE)
1215            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1216         {
1217           ip4_sv_reass_handoff_trace_t *t =
1218             vlib_add_trace (vm, node, b[0], sizeof (*t));
1219           t->next_worker_index = ti[0];
1220         }
1221
1222       n_left_from -= 1;
1223       ti += 1;
1224       b += 1;
1225     }
1226   n_enq =
1227     vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1228                                    frame->n_vectors, 1);
1229
1230   if (n_enq < frame->n_vectors)
1231     vlib_node_increment_counter (vm, node->node_index,
1232                                  IP4_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1233                                  frame->n_vectors - n_enq);
1234   return frame->n_vectors;
1235 }
1236
1237 VLIB_NODE_FN (ip4_sv_reass_handoff_node) (vlib_main_t * vm,
1238                                           vlib_node_runtime_t * node,
1239                                           vlib_frame_t * frame)
1240 {
1241   return ip4_sv_reass_handoff_node_inline (vm, node, frame,
1242                                            false /* is_feature */ );
1243 }
1244
1245
1246 /* *INDENT-OFF* */
1247 VLIB_REGISTER_NODE (ip4_sv_reass_handoff_node) = {
1248   .name = "ip4-sv-reassembly-handoff",
1249   .vector_size = sizeof (u32),
1250   .n_errors = ARRAY_LEN(ip4_sv_reass_handoff_error_strings),
1251   .error_strings = ip4_sv_reass_handoff_error_strings,
1252   .format_trace = format_ip4_sv_reass_handoff_trace,
1253
1254   .n_next_nodes = 1,
1255
1256   .next_nodes = {
1257     [0] = "error-drop",
1258   },
1259 };
1260 /* *INDENT-ON* */
1261
1262
1263 /* *INDENT-OFF* */
1264 VLIB_NODE_FN (ip4_sv_reass_feature_handoff_node) (vlib_main_t * vm,
1265                                                     vlib_node_runtime_t *
1266                                                     node,
1267                                                     vlib_frame_t * frame)
1268 {
1269   return ip4_sv_reass_handoff_node_inline (vm, node, frame,
1270                                              true /* is_feature */ );
1271 }
1272 /* *INDENT-ON* */
1273
1274
1275 /* *INDENT-OFF* */
1276 VLIB_REGISTER_NODE (ip4_sv_reass_feature_handoff_node) = {
1277   .name = "ip4-sv-reass-feature-hoff",
1278   .vector_size = sizeof (u32),
1279   .n_errors = ARRAY_LEN(ip4_sv_reass_handoff_error_strings),
1280   .error_strings = ip4_sv_reass_handoff_error_strings,
1281   .format_trace = format_ip4_sv_reass_handoff_trace,
1282
1283   .n_next_nodes = 1,
1284
1285   .next_nodes = {
1286     [0] = "error-drop",
1287   },
1288 };
1289 /* *INDENT-ON* */
1290
1291 #ifndef CLIB_MARCH_VARIANT
1292 int
1293 ip4_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1294 {
1295   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1296   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1297   if (is_enable)
1298     {
1299       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1300         {
1301           ++rm->feature_use_refcount_per_intf[sw_if_index];
1302           return vnet_feature_enable_disable ("ip4-unicast",
1303                                               "ip4-sv-reassembly-feature",
1304                                               sw_if_index, 1, 0, 0);
1305         }
1306       ++rm->feature_use_refcount_per_intf[sw_if_index];
1307     }
1308   else
1309     {
1310       if (rm->feature_use_refcount_per_intf[sw_if_index])
1311         --rm->feature_use_refcount_per_intf[sw_if_index];
1312       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1313         return vnet_feature_enable_disable ("ip4-unicast",
1314                                             "ip4-sv-reassembly-feature",
1315                                             sw_if_index, 0, 0, 0);
1316     }
1317   return 0;
1318 }
1319
1320 uword
1321 ip4_sv_reass_custom_register_next_node (uword node_index)
1322 {
1323   return vlib_node_add_next (vlib_get_main (), ip4_sv_reass_custom_node.index,
1324                              node_index);
1325 }
1326
1327 int
1328 ip4_sv_reass_output_enable_disable_with_refcnt (u32 sw_if_index,
1329                                                 int is_enable)
1330 {
1331   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1332   vec_validate (rm->output_feature_use_refcount_per_intf, sw_if_index);
1333   if (is_enable)
1334     {
1335       if (!rm->output_feature_use_refcount_per_intf[sw_if_index])
1336         {
1337           ++rm->output_feature_use_refcount_per_intf[sw_if_index];
1338           return vnet_feature_enable_disable ("ip4-output",
1339                                               "ip4-sv-reassembly-output-feature",
1340                                               sw_if_index, 1, 0, 0);
1341         }
1342       ++rm->output_feature_use_refcount_per_intf[sw_if_index];
1343     }
1344   else
1345     {
1346       if (rm->output_feature_use_refcount_per_intf[sw_if_index])
1347         --rm->output_feature_use_refcount_per_intf[sw_if_index];
1348       if (!rm->output_feature_use_refcount_per_intf[sw_if_index])
1349         return vnet_feature_enable_disable ("ip4-output",
1350                                             "ip4-sv-reassembly-output-feature",
1351                                             sw_if_index, 0, 0, 0);
1352     }
1353   return 0;
1354 }
1355 #endif
1356
1357 /*
1358  * fd.io coding-style-patch-verification: ON
1359  *
1360  * Local Variables:
1361  * eval: (c-set-style "gnu")
1362  * End:
1363  */