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