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               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               goto packet_enqueue;
 536             }
 537
 538           if (reass->is_complete)
 539             {
 540               if (is_custom)
 541                 {
 542                   next0 = vnet_buffer (b0)->ip.reass.next_index;
 543                 }
 544               else
 545                 {
 546                   next0 = IP4_SV_REASSEMBLY_NEXT_INPUT;
 547                 }
 548               vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 549                 ! !fragment_first;
 550               vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 551               vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 552                 reass->icmp_type_or_tcp_flags;
 553               vnet_buffer (b0)->ip.reass.tcp_ack_number =
 554                 reass->tcp_ack_number;
 555               vnet_buffer (b0)->ip.reass.tcp_seq_number =
 556                 reass->tcp_seq_number;
 557               vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 558               vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 559               error0 = IP4_ERROR_NONE;
 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                 u32 next0 = IP4_SV_REASSEMBLY_NEXT_INPUT;
 601                 if (is_feature)
 602                   {
 603                     vnet_feature_next (&next0, b0);
 604                   }
 605                 if (is_custom)
 606                   {
 607                     next0 = vnet_buffer (b0)->ip.reass.next_index;
 608                   }
 609                 if (0 == n_left_to_next)
 610                   {
 611                     vlib_put_next_frame (vm, node, next_index,
 612                                          n_left_to_next);
 613                     vlib_get_next_frame (vm, node, next_index, to_next,
 614                                          n_left_to_next);
 615                   }
 616                 to_next[0] = bi0;
 617                 to_next += 1;
 618                 n_left_to_next -= 1;
 619                 vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 620                   ! !ip4_get_fragment_offset (vlib_buffer_get_current (b0));
 621                 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 622                 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 623                   reass->icmp_type_or_tcp_flags;
 624                 vnet_buffer (b0)->ip.reass.tcp_ack_number =
 625                   reass->tcp_ack_number;
 626                 vnet_buffer (b0)->ip.reass.tcp_seq_number =
 627                   reass->tcp_seq_number;
 628                 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 629                 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 630                 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 631                   {
 632                     ip4_sv_reass_add_trace (vm, node, rm, reass, bi0,
 633                                             REASS_FRAGMENT_FORWARD,
 634                                             reass->ip_proto,
 635                                             reass->l4_src_port,
 636                                             reass->l4_dst_port);
 637                   }
 638                 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 639                                                  to_next, n_left_to_next, bi0,
 640                                                  next0);
 641               }
 642               _vec_len (reass->cached_buffers) = 0;     // buffers are owned by frame now
 643             }
 644           goto next_packet;
 645
 646         packet_enqueue:
 647           b0->error = node->errors[error0];
 648
 649           to_next[0] = bi0;
 650           to_next += 1;
 651           n_left_to_next -= 1;
 652           if (is_feature && IP4_ERROR_NONE == error0)
 653             {
 654               b0 = vlib_get_buffer (vm, bi0);
 655               vnet_feature_next (&next0, b0);
 656             }
 657           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 658                                            to_next, n_left_to_next,
 659                                            bi0, next0);
 660
 661         next_packet:
 662           from += 1;
 663           n_left_from -= 1;
 664         }
 665
 666       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 667     }
 668
 669   clib_spinlock_unlock (&rt->lock);
 670   return frame->n_vectors;
 671 }
 672
 673 static char *ip4_sv_reass_error_strings[] = {
 674 #define _(sym, string) string,
 675   foreach_ip4_error
 676 #undef _
 677 };
 678
 679 VLIB_NODE_FN (ip4_sv_reass_node) (vlib_main_t * vm,
 680                                   vlib_node_runtime_t * node,
 681                                   vlib_frame_t * frame)
 682 {
 683   return ip4_sv_reass_inline (vm, node, frame, false /* is_feature */ ,
 684                               false /* is_output_feature */ ,
 685                               false /* is_custom */ );
 686 }
 687
 688 /* *INDENT-OFF* */
 689 VLIB_REGISTER_NODE (ip4_sv_reass_node) = {
 690     .name = "ip4-sv-reassembly",
 691     .vector_size = sizeof (u32),
 692     .format_trace = format_ip4_sv_reass_trace,
 693     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
 694     .error_strings = ip4_sv_reass_error_strings,
 695     .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
 696     .next_nodes =
 697         {
 698                 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
 699                 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
 700                 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reassembly-handoff",
 701
 702         },
 703 };
 704 /* *INDENT-ON* */
 705
 706 VLIB_NODE_FN (ip4_sv_reass_node_feature) (vlib_main_t * vm,
 707                                           vlib_node_runtime_t * node,
 708                                           vlib_frame_t * frame)
 709 {
 710   return ip4_sv_reass_inline (vm, node, frame, true /* is_feature */ ,
 711                               false /* is_output_feature */ ,
 712                               false /* is_custom */ );
 713 }
 714
 715 /* *INDENT-OFF* */
 716 VLIB_REGISTER_NODE (ip4_sv_reass_node_feature) = {
 717     .name = "ip4-sv-reassembly-feature",
 718     .vector_size = sizeof (u32),
 719     .format_trace = format_ip4_sv_reass_trace,
 720     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
 721     .error_strings = ip4_sv_reass_error_strings,
 722     .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
 723     .next_nodes =
 724         {
 725                 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
 726                 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
 727                 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reass-feature-hoff",
 728         },
 729 };
 730 /* *INDENT-ON* */
 731
 732 /* *INDENT-OFF* */
 733 VNET_FEATURE_INIT (ip4_sv_reass_feature) = {
 734     .arc_name = "ip4-unicast",
 735     .node_name = "ip4-sv-reassembly-feature",
 736     .runs_before = VNET_FEATURES ("ip4-lookup"),
 737     .runs_after = 0,
 738 };
 739 /* *INDENT-ON* */
 740
 741 VLIB_NODE_FN (ip4_sv_reass_node_output_feature) (vlib_main_t * vm,
 742                                                  vlib_node_runtime_t * node,
 743                                                  vlib_frame_t * frame)
 744 {
 745   return ip4_sv_reass_inline (vm, node, frame, true /* is_feature */ ,
 746                               true /* is_output_feature */ ,
 747                               false /* is_custom */ );
 748 }
 749
 750
 751 /* *INDENT-OFF* */
 752 VLIB_REGISTER_NODE (ip4_sv_reass_node_output_feature) = {
 753     .name = "ip4-sv-reassembly-output-feature",
 754     .vector_size = sizeof (u32),
 755     .format_trace = format_ip4_sv_reass_trace,
 756     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
 757     .error_strings = ip4_sv_reass_error_strings,
 758     .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
 759     .next_nodes =
 760         {
 761                 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
 762                 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
 763                 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reass-feature-hoff",
 764         },
 765 };
 766 /* *INDENT-ON* */
 767
 768 /* *INDENT-OFF* */
 769 VNET_FEATURE_INIT (ip4_sv_reass_output_feature) = {
 770     .arc_name = "ip4-output",
 771     .node_name = "ip4-sv-reassembly-output-feature",
 772     .runs_before = 0,
 773     .runs_after = 0,
 774 };
 775 /* *INDENT-ON* */
 776
 777 /* *INDENT-OFF* */
 778 VLIB_REGISTER_NODE (ip4_sv_reass_custom_node) = {
 779     .name = "ip4-sv-reassembly-custom-next",
 780     .vector_size = sizeof (u32),
 781     .format_trace = format_ip4_sv_reass_trace,
 782     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
 783     .error_strings = ip4_sv_reass_error_strings,
 784     .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
 785     .next_nodes =
 786         {
 787                 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
 788                 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
 789                 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reassembly-handoff",
 790
 791         },
 792 };
 793 /* *INDENT-ON* */
 794
 795 VLIB_NODE_FN (ip4_sv_reass_custom_node) (vlib_main_t * vm,
 796                                          vlib_node_runtime_t * node,
 797                                          vlib_frame_t * frame)
 798 {
 799   return ip4_sv_reass_inline (vm, node, frame, false /* is_feature */ ,
 800                               false /* is_output_feature */ ,
 801                               true /* is_custom */ );
 802 }
 803
 804 #ifndef CLIB_MARCH_VARIANT
 805 always_inline u32
 806 ip4_sv_reass_get_nbuckets ()
 807 {
 808   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
 809   u32 nbuckets;
 810   u8 i;
 811
 812   nbuckets = (u32) (rm->max_reass_n / IP4_SV_REASS_HT_LOAD_FACTOR);
 813
 814   for (i = 0; i < 31; i++)
 815     if ((1 << i) >= nbuckets)
 816       break;
 817   nbuckets = 1 << i;
 818
 819   return nbuckets;
 820 }
 821 #endif /* CLIB_MARCH_VARIANT */
 822
 823 typedef enum
 824 {
 825   IP4_EVENT_CONFIG_CHANGED = 1,
 826 } ip4_sv_reass_event_t;
 827
 828 typedef struct
 829 {
 830   int failure;
 831   clib_bihash_16_8_t *new_hash;
 832 } ip4_rehash_cb_ctx;
 833
 834 #ifndef CLIB_MARCH_VARIANT
 835 static int
 836 ip4_rehash_cb (clib_bihash_kv_16_8_t * kv, void *_ctx)
 837 {
 838   ip4_rehash_cb_ctx *ctx = _ctx;
 839   if (clib_bihash_add_del_16_8 (ctx->new_hash, kv, 1))
 840     {
 841       ctx->failure = 1;
 842     }
 843   return (BIHASH_WALK_CONTINUE);
 844 }
 845
 846 static void
 847 ip4_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
 848                          u32 max_reassembly_length,
 849                          u32 expire_walk_interval_ms)
 850 {
 851   ip4_sv_reass_main.timeout_ms = timeout_ms;
 852   ip4_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
 853   ip4_sv_reass_main.max_reass_n = max_reassemblies;
 854   ip4_sv_reass_main.max_reass_len = max_reassembly_length;
 855   ip4_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
 856 }
 857
 858 vnet_api_error_t
 859 ip4_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
 860                   u32 max_reassembly_length, u32 expire_walk_interval_ms)
 861 {
 862   u32 old_nbuckets = ip4_sv_reass_get_nbuckets ();
 863   ip4_sv_reass_set_params (timeout_ms, max_reassemblies,
 864                            max_reassembly_length, expire_walk_interval_ms);
 865   vlib_process_signal_event (ip4_sv_reass_main.vlib_main,
 866                              ip4_sv_reass_main.ip4_sv_reass_expire_node_idx,
 867                              IP4_EVENT_CONFIG_CHANGED, 0);
 868   u32 new_nbuckets = ip4_sv_reass_get_nbuckets ();
 869   if (ip4_sv_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
 870     {
 871       clib_bihash_16_8_t new_hash;
 872       clib_memset (&new_hash, 0, sizeof (new_hash));
 873       ip4_rehash_cb_ctx ctx;
 874       ctx.failure = 0;
 875       ctx.new_hash = &new_hash;
 876       clib_bihash_init_16_8 (&new_hash, "ip4-dr", new_nbuckets,
 877                              new_nbuckets * 1024);
 878       clib_bihash_foreach_key_value_pair_16_8 (&ip4_sv_reass_main.hash,
 879                                                ip4_rehash_cb, &ctx);
 880       if (ctx.failure)
 881         {
 882           clib_bihash_free_16_8 (&new_hash);
 883           return -1;
 884         }
 885       else
 886         {
 887           clib_bihash_free_16_8 (&ip4_sv_reass_main.hash);
 888           clib_memcpy_fast (&ip4_sv_reass_main.hash, &new_hash,
 889                             sizeof (ip4_sv_reass_main.hash));
 890           clib_bihash_copied (&ip4_sv_reass_main.hash, &new_hash);
 891         }
 892     }
 893   return 0;
 894 }
 895
 896 vnet_api_error_t
 897 ip4_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
 898                   u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
 899 {
 900   *timeout_ms = ip4_sv_reass_main.timeout_ms;
 901   *max_reassemblies = ip4_sv_reass_main.max_reass_n;
 902   *max_reassembly_length = ip4_sv_reass_main.max_reass_len;
 903   *expire_walk_interval_ms = ip4_sv_reass_main.expire_walk_interval_ms;
 904   return 0;
 905 }
 906
 907 static clib_error_t *
 908 ip4_sv_reass_init_function (vlib_main_t * vm)
 909 {
 910   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
 911   clib_error_t *error = 0;
 912   u32 nbuckets;
 913   vlib_node_t *node;
 914
 915   rm->vlib_main = vm;
 916   rm->vnet_main = vnet_get_main ();
 917
 918   vec_validate (rm->per_thread_data, vlib_num_workers ());
 919   ip4_sv_reass_per_thread_t *rt;
 920   vec_foreach (rt, rm->per_thread_data)
 921   {
 922     clib_spinlock_init (&rt->lock);
 923     pool_alloc (rt->pool, rm->max_reass_n);
 924     rt->lru_first = rt->lru_last = ~0;
 925   }
 926
 927   node = vlib_get_node_by_name (vm, (u8 *) "ip4-sv-reassembly-expire-walk");
 928   ASSERT (node);
 929   rm->ip4_sv_reass_expire_node_idx = node->index;
 930
 931   ip4_sv_reass_set_params (IP4_SV_REASS_TIMEOUT_DEFAULT_MS,
 932                            IP4_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
 933                            IP4_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
 934                            IP4_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
 935
 936   nbuckets = ip4_sv_reass_get_nbuckets ();
 937   clib_bihash_init_16_8 (&rm->hash, "ip4-dr", nbuckets, nbuckets * 1024);
 938
 939   node = vlib_get_node_by_name (vm, (u8 *) "ip4-drop");
 940   ASSERT (node);
 941   rm->ip4_drop_idx = node->index;
 942
 943   rm->fq_index = vlib_frame_queue_main_init (ip4_sv_reass_node.index, 0);
 944   rm->fq_feature_index =
 945     vlib_frame_queue_main_init (ip4_sv_reass_node_feature.index, 0);
 946
 947   rm->feature_use_refcount_per_intf = NULL;
 948   rm->output_feature_use_refcount_per_intf = NULL;
 949
 950   return error;
 951 }
 952
 953 VLIB_INIT_FUNCTION (ip4_sv_reass_init_function);
 954 #endif /* CLIB_MARCH_VARIANT */
 955
 956 static uword
 957 ip4_sv_reass_walk_expired (vlib_main_t * vm,
 958                            vlib_node_runtime_t * node, vlib_frame_t * f)
 959 {
 960   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
 961   uword event_type, *event_data = 0;
 962
 963   while (true)
 964     {
 965       vlib_process_wait_for_event_or_clock (vm,
 966                                             (f64)
 967                                             rm->expire_walk_interval_ms /
 968                                             (f64) MSEC_PER_SEC);
 969       event_type = vlib_process_get_events (vm, &event_data);
 970
 971       switch (event_type)
 972         {
 973         case ~0:                /* no events => timeout */
 974           /* nothing to do here */
 975           break;
 976         case IP4_EVENT_CONFIG_CHANGED:
 977           break;
 978         default:
 979           clib_warning ("BUG: event type 0x%wx", event_type);
 980           break;
 981         }
 982       f64 now = vlib_time_now (vm);
 983
 984       ip4_sv_reass_t *reass;
 985       int *pool_indexes_to_free = NULL;
 986
 987       uword thread_index = 0;
 988       int index;
 989       const uword nthreads = vlib_num_workers () + 1;
 990       for (thread_index = 0; thread_index < nthreads; ++thread_index)
 991         {
 992           ip4_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
 993           clib_spinlock_lock (&rt->lock);
 994
 995           vec_reset_length (pool_indexes_to_free);
 996           /* *INDENT-OFF* */
 997           pool_foreach_index (index, rt->pool, ({
 998                                 reass = pool_elt_at_index (rt->pool, index);
 999                                 if (now > reass->last_heard + rm->timeout)
1000                                   {
1001                                     vec_add1 (pool_indexes_to_free, index);
1002                                   }
1003                               }));
1004           /* *INDENT-ON* */
1005           int *i;
1006           /* *INDENT-OFF* */
1007           vec_foreach (i, pool_indexes_to_free)
1008           {
1009             ip4_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1010             ip4_sv_reass_free (vm, rm, rt, reass);
1011           }
1012           /* *INDENT-ON* */
1013
1014           clib_spinlock_unlock (&rt->lock);
1015         }
1016
1017       vec_free (pool_indexes_to_free);
1018       if (event_data)
1019         {
1020           _vec_len (event_data) = 0;
1021         }
1022     }
1023
1024   return 0;
1025 }
1026
1027 /* *INDENT-OFF* */
1028 VLIB_REGISTER_NODE (ip4_sv_reass_expire_node) = {
1029     .function = ip4_sv_reass_walk_expired,
1030     .type = VLIB_NODE_TYPE_PROCESS,
1031     .name = "ip4-sv-reassembly-expire-walk",
1032     .format_trace = format_ip4_sv_reass_trace,
1033     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
1034     .error_strings = ip4_sv_reass_error_strings,
1035
1036 };
1037 /* *INDENT-ON* */
1038
1039 static u8 *
1040 format_ip4_sv_reass_key (u8 * s, va_list * args)
1041 {
1042   ip4_sv_reass_key_t *key = va_arg (*args, ip4_sv_reass_key_t *);
1043   s =
1044     format (s,
1045             "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1046             key->xx_id, format_ip4_address, &key->src, format_ip4_address,
1047             &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1048   return s;
1049 }
1050
1051 static u8 *
1052 format_ip4_sv_reass (u8 * s, va_list * args)
1053 {
1054   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1055   ip4_sv_reass_t *reass = va_arg (*args, ip4_sv_reass_t *);
1056
1057   s = format (s, "ID: %lu, key: %U trace_op_counter: %u\n",
1058               reass->id, format_ip4_sv_reass_key, &reass->key,
1059               reass->trace_op_counter);
1060
1061   vlib_buffer_t *b;
1062   u32 *bip;
1063   u32 counter = 0;
1064   vec_foreach (bip, reass->cached_buffers)
1065   {
1066     u32 bi = *bip;
1067     do
1068       {
1069         b = vlib_get_buffer (vm, bi);
1070         s = format (s, "  #%03u: bi: %u, ", counter, bi);
1071         ++counter;
1072         bi = b->next_buffer;
1073       }
1074     while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1075   }
1076   return s;
1077 }
1078
1079 static clib_error_t *
1080 show_ip4_reass (vlib_main_t * vm,
1081                 unformat_input_t * input,
1082                 CLIB_UNUSED (vlib_cli_command_t * lmd))
1083 {
1084   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1085
1086   vlib_cli_output (vm, "---------------------");
1087   vlib_cli_output (vm, "IP4 reassembly status");
1088   vlib_cli_output (vm, "---------------------");
1089   bool details = false;
1090   if (unformat (input, "details"))
1091     {
1092       details = true;
1093     }
1094
1095   u32 sum_reass_n = 0;
1096   ip4_sv_reass_t *reass;
1097   uword thread_index;
1098   const uword nthreads = vlib_num_workers () + 1;
1099   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1100     {
1101       ip4_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1102       clib_spinlock_lock (&rt->lock);
1103       if (details)
1104         {
1105           /* *INDENT-OFF* */
1106           pool_foreach (reass, rt->pool, {
1107             vlib_cli_output (vm, "%U", format_ip4_sv_reass, vm, reass);
1108           });
1109           /* *INDENT-ON* */
1110         }
1111       sum_reass_n += rt->reass_n;
1112       clib_spinlock_unlock (&rt->lock);
1113     }
1114   vlib_cli_output (vm, "---------------------");
1115   vlib_cli_output (vm, "Current IP4 reassemblies count: %lu\n",
1116                    (long unsigned) sum_reass_n);
1117   vlib_cli_output (vm,
1118                    "Maximum configured concurrent IP4 reassemblies per worker-thread: %lu\n",
1119                    (long unsigned) rm->max_reass_n);
1120   return 0;
1121 }
1122
1123 /* *INDENT-OFF* */
1124 VLIB_CLI_COMMAND (show_ip4_sv_reass_cmd, static) = {
1125     .path = "show ip4-sv-reassembly",
1126     .short_help = "show ip4-sv-reassembly [details]",
1127     .function = show_ip4_reass,
1128 };
1129 /* *INDENT-ON* */
1130
1131 #ifndef CLIB_MARCH_VARIANT
1132 vnet_api_error_t
1133 ip4_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1134 {
1135   return ip4_sv_reass_enable_disable_with_refcnt (sw_if_index,
1136                                                   enable_disable);
1137 }
1138 #endif /* CLIB_MARCH_VARIANT */
1139
1140
1141 #define foreach_ip4_sv_reass_handoff_error                       \
1142 _(CONGESTION_DROP, "congestion drop")
1143
1144
1145 typedef enum
1146 {
1147 #define _(sym,str) IP4_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
1148   foreach_ip4_sv_reass_handoff_error
1149 #undef _
1150     IP4_SV_REASSEMBLY_HANDOFF_N_ERROR,
1151 } ip4_sv_reass_handoff_error_t;
1152
1153 static char *ip4_sv_reass_handoff_error_strings[] = {
1154 #define _(sym,string) string,
1155   foreach_ip4_sv_reass_handoff_error
1156 #undef _
1157 };
1158
1159 typedef struct
1160 {
1161   u32 next_worker_index;
1162 } ip4_sv_reass_handoff_trace_t;
1163
1164 static u8 *
1165 format_ip4_sv_reass_handoff_trace (u8 * s, va_list * args)
1166 {
1167   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1168   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1169   ip4_sv_reass_handoff_trace_t *t =
1170     va_arg (*args, ip4_sv_reass_handoff_trace_t *);
1171
1172   s =
1173     format (s, "ip4-sv-reassembly-handoff: next-worker %d",
1174             t->next_worker_index);
1175
1176   return s;
1177 }
1178
1179 always_inline uword
1180 ip4_sv_reass_handoff_node_inline (vlib_main_t * vm,
1181                                   vlib_node_runtime_t * node,
1182                                   vlib_frame_t * frame, bool is_feature)
1183 {
1184   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1185
1186   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1187   u32 n_enq, n_left_from, *from;
1188   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1189   u32 fq_index;
1190
1191   from = vlib_frame_vector_args (frame);
1192   n_left_from = frame->n_vectors;
1193   vlib_get_buffers (vm, from, bufs, n_left_from);
1194
1195   b = bufs;
1196   ti = thread_indices;
1197
1198   fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1199
1200   while (n_left_from > 0)
1201     {
1202       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1203
1204       if (PREDICT_FALSE
1205           ((node->flags & VLIB_NODE_FLAG_TRACE)
1206            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1207         {
1208           ip4_sv_reass_handoff_trace_t *t =
1209             vlib_add_trace (vm, node, b[0], sizeof (*t));
1210           t->next_worker_index = ti[0];
1211         }
1212
1213       n_left_from -= 1;
1214       ti += 1;
1215       b += 1;
1216     }
1217   n_enq =
1218     vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1219                                    frame->n_vectors, 1);
1220
1221   if (n_enq < frame->n_vectors)
1222     vlib_node_increment_counter (vm, node->node_index,
1223                                  IP4_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1224                                  frame->n_vectors - n_enq);
1225   return frame->n_vectors;
1226 }
1227
1228 VLIB_NODE_FN (ip4_sv_reass_handoff_node) (vlib_main_t * vm,
1229                                           vlib_node_runtime_t * node,
1230                                           vlib_frame_t * frame)
1231 {
1232   return ip4_sv_reass_handoff_node_inline (vm, node, frame,
1233                                            false /* is_feature */ );
1234 }
1235
1236
1237 /* *INDENT-OFF* */
1238 VLIB_REGISTER_NODE (ip4_sv_reass_handoff_node) = {
1239   .name = "ip4-sv-reassembly-handoff",
1240   .vector_size = sizeof (u32),
1241   .n_errors = ARRAY_LEN(ip4_sv_reass_handoff_error_strings),
1242   .error_strings = ip4_sv_reass_handoff_error_strings,
1243   .format_trace = format_ip4_sv_reass_handoff_trace,
1244
1245   .n_next_nodes = 1,
1246
1247   .next_nodes = {
1248     [0] = "error-drop",
1249   },
1250 };
1251 /* *INDENT-ON* */
1252
1253
1254 /* *INDENT-OFF* */
1255 VLIB_NODE_FN (ip4_sv_reass_feature_handoff_node) (vlib_main_t * vm,
1256                                                     vlib_node_runtime_t *
1257                                                     node,
1258                                                     vlib_frame_t * frame)
1259 {
1260   return ip4_sv_reass_handoff_node_inline (vm, node, frame,
1261                                              true /* is_feature */ );
1262 }
1263 /* *INDENT-ON* */
1264
1265
1266 /* *INDENT-OFF* */
1267 VLIB_REGISTER_NODE (ip4_sv_reass_feature_handoff_node) = {
1268   .name = "ip4-sv-reass-feature-hoff",
1269   .vector_size = sizeof (u32),
1270   .n_errors = ARRAY_LEN(ip4_sv_reass_handoff_error_strings),
1271   .error_strings = ip4_sv_reass_handoff_error_strings,
1272   .format_trace = format_ip4_sv_reass_handoff_trace,
1273
1274   .n_next_nodes = 1,
1275
1276   .next_nodes = {
1277     [0] = "error-drop",
1278   },
1279 };
1280 /* *INDENT-ON* */
1281
1282 #ifndef CLIB_MARCH_VARIANT
1283 int
1284 ip4_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1285 {
1286   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1287   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1288   if (is_enable)
1289     {
1290       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1291         {
1292           ++rm->feature_use_refcount_per_intf[sw_if_index];
1293           return vnet_feature_enable_disable ("ip4-unicast",
1294                                               "ip4-sv-reassembly-feature",
1295                                               sw_if_index, 1, 0, 0);
1296         }
1297       ++rm->feature_use_refcount_per_intf[sw_if_index];
1298     }
1299   else
1300     {
1301       if (rm->feature_use_refcount_per_intf[sw_if_index])
1302         --rm->feature_use_refcount_per_intf[sw_if_index];
1303       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1304         return vnet_feature_enable_disable ("ip4-unicast",
1305                                             "ip4-sv-reassembly-feature",
1306                                             sw_if_index, 0, 0, 0);
1307     }
1308   return 0;
1309 }
1310
1311 uword
1312 ip4_sv_reass_custom_register_next_node (uword node_index)
1313 {
1314   return vlib_node_add_next (vlib_get_main (), ip4_sv_reass_custom_node.index,
1315                              node_index);
1316 }
1317
1318 int
1319 ip4_sv_reass_output_enable_disable_with_refcnt (u32 sw_if_index,
1320                                                 int is_enable)
1321 {
1322   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1323   vec_validate (rm->output_feature_use_refcount_per_intf, sw_if_index);
1324   if (is_enable)
1325     {
1326       if (!rm->output_feature_use_refcount_per_intf[sw_if_index])
1327         {
1328           ++rm->output_feature_use_refcount_per_intf[sw_if_index];
1329           return vnet_feature_enable_disable ("ip4-output",
1330                                               "ip4-sv-reassembly-output-feature",
1331                                               sw_if_index, 1, 0, 0);
1332         }
1333       ++rm->output_feature_use_refcount_per_intf[sw_if_index];
1334     }
1335   else
1336     {
1337       if (rm->output_feature_use_refcount_per_intf[sw_if_index])
1338         --rm->output_feature_use_refcount_per_intf[sw_if_index];
1339       if (!rm->output_feature_use_refcount_per_intf[sw_if_index])
1340         return vnet_feature_enable_disable ("ip4-output",
1341                                             "ip4-sv-reassembly-output-feature",
1342                                             sw_if_index, 0, 0, 0);
1343     }
1344   return 0;
1345 }
1346 #endif
1347
1348 /*
1349  * fd.io coding-style-patch-verification: ON
1350  *
1351  * Local Variables:
1352  * eval: (c-set-style "gnu")
1353  * End:
1354  */