src/vnet/ip/reass/ip4_sv_reass.c

   1 /*
   2  * Copyright (c) 2017 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 /**
  17  * @file
  18  * @brief IPv4 Shallow Virtual Reassembly.
  19  *
  20  * This file contains the source code for IPv4 Shallow Virtual reassembly.
  21  */
  22
  23 #include <vppinfra/vec.h>
  24 #include <vnet/vnet.h>
  25 #include <vnet/ip/ip.h>
  26 #include <vnet/ip/ip4_to_ip6.h>
  27 #include <vppinfra/fifo.h>
  28 #include <vppinfra/bihash_16_8.h>
  29 #include <vnet/ip/reass/ip4_sv_reass.h>
  30
  31 #define MSEC_PER_SEC 1000
  32 #define IP4_SV_REASS_TIMEOUT_DEFAULT_MS 100
  33 #define IP4_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000      // 10 seconds default
  34 #define IP4_SV_REASS_MAX_REASSEMBLIES_DEFAULT 1024
  35 #define IP4_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
  36 #define IP4_SV_REASS_HT_LOAD_FACTOR (0.75)
  37
  38 typedef enum
  39 {
  40   IP4_SV_REASS_RC_OK,
  41   IP4_SV_REASS_RC_TOO_MANY_FRAGMENTS,
  42   IP4_SV_REASS_RC_UNSUPP_IP_PROTO,
  43 } ip4_sv_reass_rc_t;
  44
  45 typedef struct
  46 {
  47   union
  48   {
  49     struct
  50     {
  51       u32 xx_id;
  52       ip4_address_t src;
  53       ip4_address_t dst;
  54       u16 frag_id;
  55       u8 proto;
  56       u8 unused;
  57     };
  58     u64 as_u64[2];
  59   };
  60 } ip4_sv_reass_key_t;
  61
  62 typedef union
  63 {
  64   struct
  65   {
  66     u32 reass_index;
  67     u32 thread_index;
  68   };
  69   u64 as_u64;
  70 } ip4_sv_reass_val_t;
  71
  72 typedef union
  73 {
  74   struct
  75   {
  76     ip4_sv_reass_key_t k;
  77     ip4_sv_reass_val_t v;
  78   };
  79   clib_bihash_kv_16_8_t kv;
  80 } ip4_sv_reass_kv_t;
  81
  82 typedef struct
  83 {
  84   // hash table key
  85   ip4_sv_reass_key_t key;
  86   // time when last packet was received
  87   f64 last_heard;
  88   // internal id of this reassembly
  89   u64 id;
  90   // trace operation counter
  91   u32 trace_op_counter;
  92   // minimum fragment length for this reassembly - used to estimate MTU
  93   u16 min_fragment_length;
  94   // buffer indexes of buffers in this reassembly in chronological order -
  95   // including overlaps and duplicate fragments
  96   u32 *cached_buffers;
  97   // set to true when this reassembly is completed
  98   bool is_complete;
  99   // ip protocol
 100   u8 ip_proto;
 101   u8 icmp_type_or_tcp_flags;
 102   u32 tcp_ack_number;
 103   u32 tcp_seq_number;
 104   // l4 src port
 105   u16 l4_src_port;
 106   // l4 dst port
 107   u16 l4_dst_port;
 108   u32 next_index;
 109   // lru indexes
 110   u32 lru_prev;
 111   u32 lru_next;
 112 } ip4_sv_reass_t;
 113
 114 typedef struct
 115 {
 116   ip4_sv_reass_t *pool;
 117   u32 reass_n;
 118   u32 id_counter;
 119   clib_spinlock_t lock;
 120   // lru indexes
 121   u32 lru_first;
 122   u32 lru_last;
 123
 124 } ip4_sv_reass_per_thread_t;
 125
 126 typedef struct
 127 {
 128   // IPv4 config
 129   u32 timeout_ms;
 130   f64 timeout;
 131   u32 expire_walk_interval_ms;
 132   // maximum number of fragments in one reassembly
 133   u32 max_reass_len;
 134   // maximum number of reassemblies
 135   u32 max_reass_n;
 136
 137   // IPv4 runtime
 138   clib_bihash_16_8_t hash;
 139   // per-thread data
 140   ip4_sv_reass_per_thread_t *per_thread_data;
 141
 142   // convenience
 143   vlib_main_t *vlib_main;
 144   vnet_main_t *vnet_main;
 145
 146   // node index of ip4-drop node
 147   u32 ip4_drop_idx;
 148   u32 ip4_sv_reass_expire_node_idx;
 149
 150   /** Worker handoff */
 151   u32 fq_index;
 152   u32 fq_feature_index;
 153
 154   // reference count for enabling/disabling feature - per interface
 155   u32 *feature_use_refcount_per_intf;
 156
 157   // reference count for enabling/disabling feature - per interface
 158   u32 *output_feature_use_refcount_per_intf;
 159
 160 } ip4_sv_reass_main_t;
 161
 162 extern ip4_sv_reass_main_t ip4_sv_reass_main;
 163
 164 #ifndef CLIB_MARCH_VARIANT
 165 ip4_sv_reass_main_t ip4_sv_reass_main;
 166 #endif /* CLIB_MARCH_VARIANT */
 167
 168 typedef enum
 169 {
 170   IP4_SV_REASSEMBLY_NEXT_INPUT,
 171   IP4_SV_REASSEMBLY_NEXT_DROP,
 172   IP4_SV_REASSEMBLY_NEXT_HANDOFF,
 173   IP4_SV_REASSEMBLY_N_NEXT,
 174 } ip4_sv_reass_next_t;
 175
 176 typedef enum
 177 {
 178   REASS_FRAGMENT_CACHE,
 179   REASS_FINISH,
 180   REASS_FRAGMENT_FORWARD,
 181   REASS_PASSTHROUGH,
 182 } ip4_sv_reass_trace_operation_e;
 183
 184 typedef struct
 185 {
 186   ip4_sv_reass_trace_operation_e action;
 187   u32 reass_id;
 188   u32 op_id;
 189   u8 ip_proto;
 190   u16 l4_src_port;
 191   u16 l4_dst_port;
 192 } ip4_sv_reass_trace_t;
 193
 194 extern vlib_node_registration_t ip4_sv_reass_node;
 195 extern vlib_node_registration_t ip4_sv_reass_node_feature;
 196
 197 static u8 *
 198 format_ip4_sv_reass_trace (u8 * s, va_list * args)
 199 {
 200   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 201   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 202   ip4_sv_reass_trace_t *t = va_arg (*args, ip4_sv_reass_trace_t *);
 203   if (REASS_PASSTHROUGH != t->action)
 204     {
 205       s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
 206     }
 207   switch (t->action)
 208     {
 209     case REASS_FRAGMENT_CACHE:
 210       s = format (s, "[cached]");
 211       break;
 212     case REASS_FINISH:
 213       s =
 214         format (s, "[finish, ip proto=%u, src_port=%u, dst_port=%u]",
 215                 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
 216                 clib_net_to_host_u16 (t->l4_dst_port));
 217       break;
 218     case REASS_FRAGMENT_FORWARD:
 219       s =
 220         format (s, "[forward, ip proto=%u, src_port=%u, dst_port=%u]",
 221                 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
 222                 clib_net_to_host_u16 (t->l4_dst_port));
 223       break;
 224     case REASS_PASSTHROUGH:
 225       s = format (s, "[not-fragmented]");
 226       break;
 227     }
 228   return s;
 229 }
 230
 231 static void
 232 ip4_sv_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 233                         ip4_sv_reass_main_t * rm, ip4_sv_reass_t * reass,
 234                         u32 bi, ip4_sv_reass_trace_operation_e action,
 235                         u32 ip_proto, u16 l4_src_port, u16 l4_dst_port)
 236 {
 237   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 238   ip4_sv_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 239   if (reass)
 240     {
 241       t->reass_id = reass->id;
 242       t->op_id = reass->trace_op_counter;
 243       ++reass->trace_op_counter;
 244     }
 245   t->action = action;
 246   t->ip_proto = ip_proto;
 247   t->l4_src_port = l4_src_port;
 248   t->l4_dst_port = l4_dst_port;
 249 #if 0
 250   static u8 *s = NULL;
 251   s = format (s, "%U", format_ip4_sv_reass_trace, NULL, NULL, t);
 252   printf ("%.*s\n", vec_len (s), s);
 253   fflush (stdout);
 254   vec_reset_length (s);
 255 #endif
 256 }
 257
 258
 259 always_inline void
 260 ip4_sv_reass_free (vlib_main_t * vm, ip4_sv_reass_main_t * rm,
 261                    ip4_sv_reass_per_thread_t * rt, ip4_sv_reass_t * reass)
 262 {
 263   clib_bihash_kv_16_8_t kv;
 264   kv.key[0] = reass->key.as_u64[0];
 265   kv.key[1] = reass->key.as_u64[1];
 266   clib_bihash_add_del_16_8 (&rm->hash, &kv, 0);
 267   vlib_buffer_free (vm, reass->cached_buffers,
 268                     vec_len (reass->cached_buffers));
 269   vec_free (reass->cached_buffers);
 270   reass->cached_buffers = NULL;
 271   if (~0 != reass->lru_prev)
 272     {
 273       ip4_sv_reass_t *lru_prev =
 274         pool_elt_at_index (rt->pool, reass->lru_prev);
 275       lru_prev->lru_next = reass->lru_next;
 276     }
 277   if (~0 != reass->lru_next)
 278     {
 279       ip4_sv_reass_t *lru_next =
 280         pool_elt_at_index (rt->pool, reass->lru_next);
 281       lru_next->lru_prev = reass->lru_prev;
 282     }
 283   if (rt->lru_first == reass - rt->pool)
 284     {
 285       rt->lru_first = reass->lru_next;
 286     }
 287   if (rt->lru_last == reass - rt->pool)
 288     {
 289       rt->lru_last = reass->lru_prev;
 290     }
 291   pool_put (rt->pool, reass);
 292   --rt->reass_n;
 293 }
 294
 295 always_inline void
 296 ip4_sv_reass_init (ip4_sv_reass_t * reass)
 297 {
 298   reass->cached_buffers = NULL;
 299   reass->is_complete = false;
 300 }
 301
 302 always_inline ip4_sv_reass_t *
 303 ip4_sv_reass_find_or_create (vlib_main_t * vm, ip4_sv_reass_main_t * rm,
 304                              ip4_sv_reass_per_thread_t * rt,
 305                              ip4_sv_reass_kv_t * kv, u8 * do_handoff)
 306 {
 307   ip4_sv_reass_t *reass = NULL;
 308   f64 now = vlib_time_now (vm);
 309
 310   if (!clib_bihash_search_16_8 (&rm->hash, &kv->kv, &kv->kv))
 311     {
 312       if (vm->thread_index != kv->v.thread_index)
 313         {
 314           *do_handoff = 1;
 315           return NULL;
 316         }
 317       reass = pool_elt_at_index (rt->pool, kv->v.reass_index);
 318
 319       if (now > reass->last_heard + rm->timeout)
 320         {
 321           ip4_sv_reass_free (vm, rm, rt, reass);
 322           reass = NULL;
 323         }
 324     }
 325
 326   if (reass)
 327     {
 328       reass->last_heard = now;
 329       return reass;
 330     }
 331
 332   if (rt->reass_n >= rm->max_reass_n && rm->max_reass_n)
 333     {
 334       reass = pool_elt_at_index (rt->pool, rt->lru_last);
 335       ip4_sv_reass_free (vm, rm, rt, reass);
 336     }
 337
 338   pool_get (rt->pool, reass);
 339   clib_memset (reass, 0, sizeof (*reass));
 340   reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 341   ++rt->id_counter;
 342   ip4_sv_reass_init (reass);
 343   ++rt->reass_n;
 344   reass->lru_prev = reass->lru_next = ~0;
 345
 346   if (~0 != rt->lru_last)
 347     {
 348       ip4_sv_reass_t *lru_last = pool_elt_at_index (rt->pool, rt->lru_last);
 349       reass->lru_prev = rt->lru_last;
 350       lru_last->lru_next = rt->lru_last = reass - rt->pool;
 351     }
 352
 353   if (~0 == rt->lru_first)
 354     {
 355       rt->lru_first = rt->lru_last = reass - rt->pool;
 356     }
 357
 358   reass->key.as_u64[0] = kv->kv.key[0];
 359   reass->key.as_u64[1] = kv->kv.key[1];
 360   kv->v.reass_index = (reass - rt->pool);
 361   kv->v.thread_index = vm->thread_index;
 362   reass->last_heard = now;
 363
 364   if (clib_bihash_add_del_16_8 (&rm->hash, &kv->kv, 1))
 365     {
 366       ip4_sv_reass_free (vm, rm, rt, reass);
 367       reass = NULL;
 368     }
 369
 370   return reass;
 371 }
 372
 373 always_inline ip4_sv_reass_rc_t
 374 ip4_sv_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 375                      ip4_sv_reass_main_t * rm, ip4_sv_reass_per_thread_t * rt,
 376                      ip4_header_t * ip0, ip4_sv_reass_t * reass, u32 bi0)
 377 {
 378   vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
 379   ip4_sv_reass_rc_t rc = IP4_SV_REASS_RC_OK;
 380   const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
 381   if (0 == fragment_first)
 382     {
 383       reass->ip_proto = ip0->protocol;
 384       reass->l4_src_port = ip4_get_port (ip0, 1);
 385       reass->l4_dst_port = ip4_get_port (ip0, 0);
 386       if (!reass->l4_src_port || !reass->l4_dst_port)
 387         return IP4_SV_REASS_RC_UNSUPP_IP_PROTO;
 388       if (IP_PROTOCOL_TCP == reass->ip_proto)
 389         {
 390           reass->icmp_type_or_tcp_flags = ((tcp_header_t *) (ip0 + 1))->flags;
 391           reass->tcp_ack_number = ((tcp_header_t *) (ip0 + 1))->ack_number;
 392           reass->tcp_seq_number = ((tcp_header_t *) (ip0 + 1))->seq_number;
 393         }
 394       else if (IP_PROTOCOL_ICMP == reass->ip_proto)
 395         {
 396           reass->icmp_type_or_tcp_flags =
 397             ((icmp46_header_t *) (ip0 + 1))->type;
 398         }
 399       reass->is_complete = true;
 400       vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
 401       if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 402         {
 403           ip4_sv_reass_add_trace (vm, node, rm, reass, bi0, REASS_FINISH,
 404                                   reass->ip_proto, reass->l4_src_port,
 405                                   reass->l4_dst_port);
 406         }
 407     }
 408   vec_add1 (reass->cached_buffers, bi0);
 409   if (!reass->is_complete)
 410     {
 411       if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 412         {
 413           ip4_sv_reass_add_trace (vm, node, rm, reass, bi0,
 414                                   REASS_FRAGMENT_CACHE, ~0, ~0, ~0);
 415         }
 416       if (vec_len (reass->cached_buffers) > rm->max_reass_len)
 417         {
 418           rc = IP4_SV_REASS_RC_TOO_MANY_FRAGMENTS;
 419         }
 420     }
 421   return rc;
 422 }
 423
 424 always_inline uword
 425 ip4_sv_reass_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 426                      vlib_frame_t * frame, bool is_feature,
 427                      bool is_output_feature, bool is_custom)
 428 {
 429   u32 *from = vlib_frame_vector_args (frame);
 430   u32 n_left_from, n_left_to_next, *to_next, next_index;
 431   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
 432   ip4_sv_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
 433   clib_spinlock_lock (&rt->lock);
 434
 435   n_left_from = frame->n_vectors;
 436   next_index = node->cached_next_index;
 437
 438   while (n_left_from > 0)
 439     {
 440       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 441
 442       while (n_left_from > 0 && n_left_to_next > 0)
 443         {
 444           u32 bi0;
 445           vlib_buffer_t *b0;
 446           u32 next0;
 447           u32 error0 = IP4_ERROR_NONE;
 448
 449           bi0 = from[0];
 450           b0 = vlib_get_buffer (vm, bi0);
 451
 452           ip4_header_t *ip0 =
 453             (ip4_header_t *) u8_ptr_add (vlib_buffer_get_current (b0),
 454                                          is_output_feature *
 455                                          vnet_buffer (b0)->
 456                                          ip.save_rewrite_length);
 457           if (!ip4_get_fragment_more (ip0) && !ip4_get_fragment_offset (ip0))
 458             {
 459               // this is a regular packet - no fragmentation
 460               if (is_custom)
 461                 {
 462                   next0 = vnet_buffer (b0)->ip.reass.next_index;
 463                 }
 464               else
 465                 {
 466                   next0 = IP4_SV_REASSEMBLY_NEXT_INPUT;
 467                 }
 468               vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
 469               vnet_buffer (b0)->ip.reass.ip_proto = ip0->protocol;
 470               if (IP_PROTOCOL_TCP == ip0->protocol)
 471                 {
 472                   vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 473                     ((tcp_header_t *) (ip0 + 1))->flags;
 474                   vnet_buffer (b0)->ip.reass.tcp_ack_number =
 475                     ((tcp_header_t *) (ip0 + 1))->ack_number;
 476                   vnet_buffer (b0)->ip.reass.tcp_seq_number =
 477                     ((tcp_header_t *) (ip0 + 1))->seq_number;
 478                 }
 479               else if (IP_PROTOCOL_ICMP == ip0->protocol)
 480                 {
 481                   vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 482                     ((icmp46_header_t *) (ip0 + 1))->type;
 483                 }
 484               vnet_buffer (b0)->ip.reass.l4_src_port = ip4_get_port (ip0, 1);
 485               vnet_buffer (b0)->ip.reass.l4_dst_port = ip4_get_port (ip0, 0);
 486               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 487                 {
 488                   ip4_sv_reass_add_trace (vm, node, rm, NULL, bi0,
 489                                           REASS_PASSTHROUGH,
 490                                           vnet_buffer (b0)->ip.reass.ip_proto,
 491                                           vnet_buffer (b0)->ip.
 492                                           reass.l4_src_port,
 493                                           vnet_buffer (b0)->ip.
 494                                           reass.l4_dst_port);
 495                 }
 496               goto packet_enqueue;
 497             }
 498           const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
 499           const u32 fragment_length =
 500             clib_net_to_host_u16 (ip0->length) - ip4_header_bytes (ip0);
 501           const u32 fragment_last = fragment_first + fragment_length - 1;
 502           if (fragment_first > fragment_last || fragment_first + fragment_length > UINT16_MAX - 20 || (fragment_length < 8 && ip4_get_fragment_more (ip0)))     // 8 is minimum frag length per RFC 791
 503             {
 504               next0 = IP4_SV_REASSEMBLY_NEXT_DROP;
 505               error0 = IP4_ERROR_REASS_MALFORMED_PACKET;
 506               b0->error = node->errors[error0];
 507               goto packet_enqueue;
 508             }
 509           ip4_sv_reass_kv_t kv;
 510           u8 do_handoff = 0;
 511
 512           kv.k.as_u64[0] =
 513             (u64) vec_elt (ip4_main.fib_index_by_sw_if_index,
 514                            vnet_buffer (b0)->sw_if_index[VLIB_RX]) |
 515             (u64) ip0->src_address.as_u32 << 32;
 516           kv.k.as_u64[1] =
 517             (u64) ip0->dst_address.
 518             as_u32 | (u64) ip0->fragment_id << 32 | (u64) ip0->protocol << 48;
 519
 520           ip4_sv_reass_t *reass =
 521             ip4_sv_reass_find_or_create (vm, rm, rt, &kv, &do_handoff);
 522
 523           if (PREDICT_FALSE (do_handoff))
 524             {
 525               next0 = IP4_SV_REASSEMBLY_NEXT_HANDOFF;
 526               vnet_buffer (b0)->ip.reass.owner_thread_index =
 527                 kv.v.thread_index;
 528               goto packet_enqueue;
 529             }
 530
 531           if (!reass)
 532             {
 533               next0 = IP4_SV_REASSEMBLY_NEXT_DROP;
 534               error0 = IP4_ERROR_REASS_LIMIT_REACHED;
 535               b0->error = node->errors[error0];
 536               goto packet_enqueue;
 537             }
 538
 539           if (reass->is_complete)
 540             {
 541               if (is_custom)
 542                 {
 543                   next0 = vnet_buffer (b0)->ip.reass.next_index;
 544                 }
 545               else
 546                 {
 547                   next0 = IP4_SV_REASSEMBLY_NEXT_INPUT;
 548                 }
 549               vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 550                 ! !fragment_first;
 551               vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 552               vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 553                 reass->icmp_type_or_tcp_flags;
 554               vnet_buffer (b0)->ip.reass.tcp_ack_number =
 555                 reass->tcp_ack_number;
 556               vnet_buffer (b0)->ip.reass.tcp_seq_number =
 557                 reass->tcp_seq_number;
 558               vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 559               vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 560               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 561                 {
 562                   ip4_sv_reass_add_trace (vm, node, rm, reass, bi0,
 563                                           REASS_FRAGMENT_FORWARD,
 564                                           reass->ip_proto,
 565                                           reass->l4_src_port,
 566                                           reass->l4_dst_port);
 567                 }
 568               goto packet_enqueue;
 569             }
 570
 571           ip4_sv_reass_rc_t rc =
 572             ip4_sv_reass_update (vm, node, rm, rt, ip0, reass, bi0);
 573           switch (rc)
 574             {
 575             case IP4_SV_REASS_RC_OK:
 576               /* nothing to do here */
 577               break;
 578             case IP4_SV_REASS_RC_TOO_MANY_FRAGMENTS:
 579               vlib_node_increment_counter (vm, node->node_index,
 580                                            IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
 581                                            1);
 582               ip4_sv_reass_free (vm, rm, rt, reass);
 583               goto next_packet;
 584               break;
 585             case IP4_SV_REASS_RC_UNSUPP_IP_PROTO:
 586               vlib_node_increment_counter (vm, node->node_index,
 587                                            IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
 588                                            1);
 589               ip4_sv_reass_free (vm, rm, rt, reass);
 590               goto next_packet;
 591               break;
 592             }
 593           if (reass->is_complete)
 594             {
 595               u32 idx;
 596               vec_foreach_index (idx, reass->cached_buffers)
 597               {
 598                 u32 bi0 = vec_elt (reass->cached_buffers, idx);
 599                 vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
 600                 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           to_next[0] = bi0;
 648           to_next += 1;
 649           n_left_to_next -= 1;
 650           if (is_feature && IP4_ERROR_NONE == error0)
 651             {
 652               b0 = vlib_get_buffer (vm, bi0);
 653               vnet_feature_next (&next0, b0);
 654             }
 655           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 656                                            to_next, n_left_to_next,
 657                                            bi0, next0);
 658
 659         next_packet:
 660           from += 1;
 661           n_left_from -= 1;
 662         }
 663
 664       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 665     }
 666
 667   clib_spinlock_unlock (&rt->lock);
 668   return frame->n_vectors;
 669 }
 670
 671 static char *ip4_sv_reass_error_strings[] = {
 672 #define _(sym, string) string,
 673   foreach_ip4_error
 674 #undef _
 675 };
 676
 677 VLIB_NODE_FN (ip4_sv_reass_node) (vlib_main_t * vm,
 678                                   vlib_node_runtime_t * node,
 679                                   vlib_frame_t * frame)
 680 {
 681   return ip4_sv_reass_inline (vm, node, frame, false /* is_feature */ ,
 682                               false /* is_output_feature */ ,
 683                               false /* is_custom */ );
 684 }
 685
 686 /* *INDENT-OFF* */
 687 VLIB_REGISTER_NODE (ip4_sv_reass_node) = {
 688     .name = "ip4-sv-reassembly",
 689     .vector_size = sizeof (u32),
 690     .format_trace = format_ip4_sv_reass_trace,
 691     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
 692     .error_strings = ip4_sv_reass_error_strings,
 693     .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
 694     .next_nodes =
 695         {
 696                 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
 697                 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
 698                 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reassembly-handoff",
 699
 700         },
 701 };
 702 /* *INDENT-ON* */
 703
 704 VLIB_NODE_FN (ip4_sv_reass_node_feature) (vlib_main_t * vm,
 705                                           vlib_node_runtime_t * node,
 706                                           vlib_frame_t * frame)
 707 {
 708   return ip4_sv_reass_inline (vm, node, frame, true /* is_feature */ ,
 709                               false /* is_output_feature */ ,
 710                               false /* is_custom */ );
 711 }
 712
 713 /* *INDENT-OFF* */
 714 VLIB_REGISTER_NODE (ip4_sv_reass_node_feature) = {
 715     .name = "ip4-sv-reassembly-feature",
 716     .vector_size = sizeof (u32),
 717     .format_trace = format_ip4_sv_reass_trace,
 718     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
 719     .error_strings = ip4_sv_reass_error_strings,
 720     .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
 721     .next_nodes =
 722         {
 723                 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
 724                 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
 725                 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reass-feature-hoff",
 726         },
 727 };
 728 /* *INDENT-ON* */
 729
 730 /* *INDENT-OFF* */
 731 VNET_FEATURE_INIT (ip4_sv_reass_feature) = {
 732     .arc_name = "ip4-unicast",
 733     .node_name = "ip4-sv-reassembly-feature",
 734     .runs_before = VNET_FEATURES ("ip4-lookup"),
 735     .runs_after = 0,
 736 };
 737 /* *INDENT-ON* */
 738
 739 VLIB_NODE_FN (ip4_sv_reass_node_output_feature) (vlib_main_t * vm,
 740                                                  vlib_node_runtime_t * node,
 741                                                  vlib_frame_t * frame)
 742 {
 743   return ip4_sv_reass_inline (vm, node, frame, true /* is_feature */ ,
 744                               true /* is_output_feature */ ,
 745                               false /* is_custom */ );
 746 }
 747
 748
 749 /* *INDENT-OFF* */
 750 VLIB_REGISTER_NODE (ip4_sv_reass_node_output_feature) = {
 751     .name = "ip4-sv-reassembly-output-feature",
 752     .vector_size = sizeof (u32),
 753     .format_trace = format_ip4_sv_reass_trace,
 754     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
 755     .error_strings = ip4_sv_reass_error_strings,
 756     .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
 757     .next_nodes =
 758         {
 759                 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
 760                 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
 761                 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reass-feature-hoff",
 762         },
 763 };
 764 /* *INDENT-ON* */
 765
 766 /* *INDENT-OFF* */
 767 VNET_FEATURE_INIT (ip4_sv_reass_output_feature) = {
 768     .arc_name = "ip4-output",
 769     .node_name = "ip4-sv-reassembly-output-feature",
 770     .runs_before = 0,
 771     .runs_after = 0,
 772 };
 773 /* *INDENT-ON* */
 774
 775 /* *INDENT-OFF* */
 776 VLIB_REGISTER_NODE (ip4_sv_reass_custom_node) = {
 777     .name = "ip4-sv-reassembly-custom-next",
 778     .vector_size = sizeof (u32),
 779     .format_trace = format_ip4_sv_reass_trace,
 780     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
 781     .error_strings = ip4_sv_reass_error_strings,
 782     .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
 783     .next_nodes =
 784         {
 785                 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
 786                 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
 787                 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reassembly-handoff",
 788
 789         },
 790 };
 791 /* *INDENT-ON* */
 792
 793 VLIB_NODE_FN (ip4_sv_reass_custom_node) (vlib_main_t * vm,
 794                                          vlib_node_runtime_t * node,
 795                                          vlib_frame_t * frame)
 796 {
 797   return ip4_sv_reass_inline (vm, node, frame, false /* is_feature */ ,
 798                               false /* is_output_feature */ ,
 799                               true /* is_custom */ );
 800 }
 801
 802 #ifndef CLIB_MARCH_VARIANT
 803 always_inline u32
 804 ip4_sv_reass_get_nbuckets ()
 805 {
 806   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
 807   u32 nbuckets;
 808   u8 i;
 809
 810   nbuckets = (u32) (rm->max_reass_n / IP4_SV_REASS_HT_LOAD_FACTOR);
 811
 812   for (i = 0; i < 31; i++)
 813     if ((1 << i) >= nbuckets)
 814       break;
 815   nbuckets = 1 << i;
 816
 817   return nbuckets;
 818 }
 819 #endif /* CLIB_MARCH_VARIANT */
 820
 821 typedef enum
 822 {
 823   IP4_EVENT_CONFIG_CHANGED = 1,
 824 } ip4_sv_reass_event_t;
 825
 826 typedef struct
 827 {
 828   int failure;
 829   clib_bihash_16_8_t *new_hash;
 830 } ip4_rehash_cb_ctx;
 831
 832 #ifndef CLIB_MARCH_VARIANT
 833 static int
 834 ip4_rehash_cb (clib_bihash_kv_16_8_t * kv, void *_ctx)
 835 {
 836   ip4_rehash_cb_ctx *ctx = _ctx;
 837   if (clib_bihash_add_del_16_8 (ctx->new_hash, kv, 1))
 838     {
 839       ctx->failure = 1;
 840     }
 841   return (BIHASH_WALK_CONTINUE);
 842 }
 843
 844 static void
 845 ip4_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
 846                          u32 max_reassembly_length,
 847                          u32 expire_walk_interval_ms)
 848 {
 849   ip4_sv_reass_main.timeout_ms = timeout_ms;
 850   ip4_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
 851   ip4_sv_reass_main.max_reass_n = max_reassemblies;
 852   ip4_sv_reass_main.max_reass_len = max_reassembly_length;
 853   ip4_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
 854 }
 855
 856 vnet_api_error_t
 857 ip4_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
 858                   u32 max_reassembly_length, u32 expire_walk_interval_ms)
 859 {
 860   u32 old_nbuckets = ip4_sv_reass_get_nbuckets ();
 861   ip4_sv_reass_set_params (timeout_ms, max_reassemblies,
 862                            max_reassembly_length, expire_walk_interval_ms);
 863   vlib_process_signal_event (ip4_sv_reass_main.vlib_main,
 864                              ip4_sv_reass_main.ip4_sv_reass_expire_node_idx,
 865                              IP4_EVENT_CONFIG_CHANGED, 0);
 866   u32 new_nbuckets = ip4_sv_reass_get_nbuckets ();
 867   if (ip4_sv_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
 868     {
 869       clib_bihash_16_8_t new_hash;
 870       clib_memset (&new_hash, 0, sizeof (new_hash));
 871       ip4_rehash_cb_ctx ctx;
 872       ctx.failure = 0;
 873       ctx.new_hash = &new_hash;
 874       clib_bihash_init_16_8 (&new_hash, "ip4-dr", new_nbuckets,
 875                              new_nbuckets * 1024);
 876       clib_bihash_foreach_key_value_pair_16_8 (&ip4_sv_reass_main.hash,
 877                                                ip4_rehash_cb, &ctx);
 878       if (ctx.failure)
 879         {
 880           clib_bihash_free_16_8 (&new_hash);
 881           return -1;
 882         }
 883       else
 884         {
 885           clib_bihash_free_16_8 (&ip4_sv_reass_main.hash);
 886           clib_memcpy_fast (&ip4_sv_reass_main.hash, &new_hash,
 887                             sizeof (ip4_sv_reass_main.hash));
 888           clib_bihash_copied (&ip4_sv_reass_main.hash, &new_hash);
 889         }
 890     }
 891   return 0;
 892 }
 893
 894 vnet_api_error_t
 895 ip4_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
 896                   u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
 897 {
 898   *timeout_ms = ip4_sv_reass_main.timeout_ms;
 899   *max_reassemblies = ip4_sv_reass_main.max_reass_n;
 900   *max_reassembly_length = ip4_sv_reass_main.max_reass_len;
 901   *expire_walk_interval_ms = ip4_sv_reass_main.expire_walk_interval_ms;
 902   return 0;
 903 }
 904
 905 static clib_error_t *
 906 ip4_sv_reass_init_function (vlib_main_t * vm)
 907 {
 908   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
 909   clib_error_t *error = 0;
 910   u32 nbuckets;
 911   vlib_node_t *node;
 912
 913   rm->vlib_main = vm;
 914   rm->vnet_main = vnet_get_main ();
 915
 916   vec_validate (rm->per_thread_data, vlib_num_workers ());
 917   ip4_sv_reass_per_thread_t *rt;
 918   vec_foreach (rt, rm->per_thread_data)
 919   {
 920     clib_spinlock_init (&rt->lock);
 921     pool_alloc (rt->pool, rm->max_reass_n);
 922     rt->lru_first = rt->lru_last = ~0;
 923   }
 924
 925   node = vlib_get_node_by_name (vm, (u8 *) "ip4-sv-reassembly-expire-walk");
 926   ASSERT (node);
 927   rm->ip4_sv_reass_expire_node_idx = node->index;
 928
 929   ip4_sv_reass_set_params (IP4_SV_REASS_TIMEOUT_DEFAULT_MS,
 930                            IP4_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
 931                            IP4_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
 932                            IP4_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
 933
 934   nbuckets = ip4_sv_reass_get_nbuckets ();
 935   clib_bihash_init_16_8 (&rm->hash, "ip4-dr", nbuckets, nbuckets * 1024);
 936
 937   node = vlib_get_node_by_name (vm, (u8 *) "ip4-drop");
 938   ASSERT (node);
 939   rm->ip4_drop_idx = node->index;
 940
 941   rm->fq_index = vlib_frame_queue_main_init (ip4_sv_reass_node.index, 0);
 942   rm->fq_feature_index =
 943     vlib_frame_queue_main_init (ip4_sv_reass_node_feature.index, 0);
 944
 945   rm->feature_use_refcount_per_intf = NULL;
 946   rm->output_feature_use_refcount_per_intf = NULL;
 947
 948   return error;
 949 }
 950
 951 VLIB_INIT_FUNCTION (ip4_sv_reass_init_function);
 952 #endif /* CLIB_MARCH_VARIANT */
 953
 954 static uword
 955 ip4_sv_reass_walk_expired (vlib_main_t * vm,
 956                            vlib_node_runtime_t * node, vlib_frame_t * f)
 957 {
 958   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
 959   uword event_type, *event_data = 0;
 960
 961   while (true)
 962     {
 963       vlib_process_wait_for_event_or_clock (vm,
 964                                             (f64)
 965                                             rm->expire_walk_interval_ms /
 966                                             (f64) MSEC_PER_SEC);
 967       event_type = vlib_process_get_events (vm, &event_data);
 968
 969       switch (event_type)
 970         {
 971         case ~0:                /* no events => timeout */
 972           /* nothing to do here */
 973           break;
 974         case IP4_EVENT_CONFIG_CHANGED:
 975           break;
 976         default:
 977           clib_warning ("BUG: event type 0x%wx", event_type);
 978           break;
 979         }
 980       f64 now = vlib_time_now (vm);
 981
 982       ip4_sv_reass_t *reass;
 983       int *pool_indexes_to_free = NULL;
 984
 985       uword thread_index = 0;
 986       int index;
 987       const uword nthreads = vlib_num_workers () + 1;
 988       for (thread_index = 0; thread_index < nthreads; ++thread_index)
 989         {
 990           ip4_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
 991           clib_spinlock_lock (&rt->lock);
 992
 993           vec_reset_length (pool_indexes_to_free);
 994           /* *INDENT-OFF* */
 995           pool_foreach_index (index, rt->pool, ({
 996                                 reass = pool_elt_at_index (rt->pool, index);
 997                                 if (now > reass->last_heard + rm->timeout)
 998                                   {
 999                                     vec_add1 (pool_indexes_to_free, index);
1000                                   }
1001                               }));
1002           /* *INDENT-ON* */
1003           int *i;
1004           /* *INDENT-OFF* */
1005           vec_foreach (i, pool_indexes_to_free)
1006           {
1007             ip4_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1008             ip4_sv_reass_free (vm, rm, rt, reass);
1009           }
1010           /* *INDENT-ON* */
1011
1012           clib_spinlock_unlock (&rt->lock);
1013         }
1014
1015       vec_free (pool_indexes_to_free);
1016       if (event_data)
1017         {
1018           _vec_len (event_data) = 0;
1019         }
1020     }
1021
1022   return 0;
1023 }
1024
1025 /* *INDENT-OFF* */
1026 VLIB_REGISTER_NODE (ip4_sv_reass_expire_node) = {
1027     .function = ip4_sv_reass_walk_expired,
1028     .type = VLIB_NODE_TYPE_PROCESS,
1029     .name = "ip4-sv-reassembly-expire-walk",
1030     .format_trace = format_ip4_sv_reass_trace,
1031     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
1032     .error_strings = ip4_sv_reass_error_strings,
1033
1034 };
1035 /* *INDENT-ON* */
1036
1037 static u8 *
1038 format_ip4_sv_reass_key (u8 * s, va_list * args)
1039 {
1040   ip4_sv_reass_key_t *key = va_arg (*args, ip4_sv_reass_key_t *);
1041   s =
1042     format (s,
1043             "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1044             key->xx_id, format_ip4_address, &key->src, format_ip4_address,
1045             &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1046   return s;
1047 }
1048
1049 static u8 *
1050 format_ip4_sv_reass (u8 * s, va_list * args)
1051 {
1052   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1053   ip4_sv_reass_t *reass = va_arg (*args, ip4_sv_reass_t *);
1054
1055   s = format (s, "ID: %lu, key: %U trace_op_counter: %u\n",
1056               reass->id, format_ip4_sv_reass_key, &reass->key,
1057               reass->trace_op_counter);
1058
1059   vlib_buffer_t *b;
1060   u32 *bip;
1061   u32 counter = 0;
1062   vec_foreach (bip, reass->cached_buffers)
1063   {
1064     u32 bi = *bip;
1065     do
1066       {
1067         b = vlib_get_buffer (vm, bi);
1068         s = format (s, "  #%03u: bi: %u, ", counter, bi);
1069         ++counter;
1070         bi = b->next_buffer;
1071       }
1072     while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1073   }
1074   return s;
1075 }
1076
1077 static clib_error_t *
1078 show_ip4_reass (vlib_main_t * vm,
1079                 unformat_input_t * input,
1080                 CLIB_UNUSED (vlib_cli_command_t * lmd))
1081 {
1082   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1083
1084   vlib_cli_output (vm, "---------------------");
1085   vlib_cli_output (vm, "IP4 reassembly status");
1086   vlib_cli_output (vm, "---------------------");
1087   bool details = false;
1088   if (unformat (input, "details"))
1089     {
1090       details = true;
1091     }
1092
1093   u32 sum_reass_n = 0;
1094   ip4_sv_reass_t *reass;
1095   uword thread_index;
1096   const uword nthreads = vlib_num_workers () + 1;
1097   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1098     {
1099       ip4_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1100       clib_spinlock_lock (&rt->lock);
1101       if (details)
1102         {
1103           /* *INDENT-OFF* */
1104           pool_foreach (reass, rt->pool, {
1105             vlib_cli_output (vm, "%U", format_ip4_sv_reass, vm, reass);
1106           });
1107           /* *INDENT-ON* */
1108         }
1109       sum_reass_n += rt->reass_n;
1110       clib_spinlock_unlock (&rt->lock);
1111     }
1112   vlib_cli_output (vm, "---------------------");
1113   vlib_cli_output (vm, "Current IP4 reassemblies count: %lu\n",
1114                    (long unsigned) sum_reass_n);
1115   vlib_cli_output (vm,
1116                    "Maximum configured concurrent shallow virtual IP4 reassemblies per worker-thread: %lu\n",
1117                    (long unsigned) rm->max_reass_n);
1118   vlib_cli_output (vm,
1119                    "Maximum configured shallow virtual IP4 reassembly timeout: %lums\n",
1120                    (long unsigned) rm->timeout_ms);
1121   vlib_cli_output (vm,
1122                    "Maximum configured shallow virtual IP4 reassembly expire walk interval: %lums\n",
1123                    (long unsigned) rm->expire_walk_interval_ms);
1124   return 0;
1125 }
1126
1127 /* *INDENT-OFF* */
1128 VLIB_CLI_COMMAND (show_ip4_sv_reass_cmd, static) = {
1129     .path = "show ip4-sv-reassembly",
1130     .short_help = "show ip4-sv-reassembly [details]",
1131     .function = show_ip4_reass,
1132 };
1133 /* *INDENT-ON* */
1134
1135 #ifndef CLIB_MARCH_VARIANT
1136 vnet_api_error_t
1137 ip4_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1138 {
1139   return ip4_sv_reass_enable_disable_with_refcnt (sw_if_index,
1140                                                   enable_disable);
1141 }
1142 #endif /* CLIB_MARCH_VARIANT */
1143
1144
1145 #define foreach_ip4_sv_reass_handoff_error                       \
1146 _(CONGESTION_DROP, "congestion drop")
1147
1148
1149 typedef enum
1150 {
1151 #define _(sym,str) IP4_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
1152   foreach_ip4_sv_reass_handoff_error
1153 #undef _
1154     IP4_SV_REASSEMBLY_HANDOFF_N_ERROR,
1155 } ip4_sv_reass_handoff_error_t;
1156
1157 static char *ip4_sv_reass_handoff_error_strings[] = {
1158 #define _(sym,string) string,
1159   foreach_ip4_sv_reass_handoff_error
1160 #undef _
1161 };
1162
1163 typedef struct
1164 {
1165   u32 next_worker_index;
1166 } ip4_sv_reass_handoff_trace_t;
1167
1168 static u8 *
1169 format_ip4_sv_reass_handoff_trace (u8 * s, va_list * args)
1170 {
1171   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1172   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1173   ip4_sv_reass_handoff_trace_t *t =
1174     va_arg (*args, ip4_sv_reass_handoff_trace_t *);
1175
1176   s =
1177     format (s, "ip4-sv-reassembly-handoff: next-worker %d",
1178             t->next_worker_index);
1179
1180   return s;
1181 }
1182
1183 always_inline uword
1184 ip4_sv_reass_handoff_node_inline (vlib_main_t * vm,
1185                                   vlib_node_runtime_t * node,
1186                                   vlib_frame_t * frame, bool is_feature)
1187 {
1188   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1189
1190   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1191   u32 n_enq, n_left_from, *from;
1192   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1193   u32 fq_index;
1194
1195   from = vlib_frame_vector_args (frame);
1196   n_left_from = frame->n_vectors;
1197   vlib_get_buffers (vm, from, bufs, n_left_from);
1198
1199   b = bufs;
1200   ti = thread_indices;
1201
1202   fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1203
1204   while (n_left_from > 0)
1205     {
1206       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1207
1208       if (PREDICT_FALSE
1209           ((node->flags & VLIB_NODE_FLAG_TRACE)
1210            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1211         {
1212           ip4_sv_reass_handoff_trace_t *t =
1213             vlib_add_trace (vm, node, b[0], sizeof (*t));
1214           t->next_worker_index = ti[0];
1215         }
1216
1217       n_left_from -= 1;
1218       ti += 1;
1219       b += 1;
1220     }
1221   n_enq =
1222     vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1223                                    frame->n_vectors, 1);
1224
1225   if (n_enq < frame->n_vectors)
1226     vlib_node_increment_counter (vm, node->node_index,
1227                                  IP4_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1228                                  frame->n_vectors - n_enq);
1229   return frame->n_vectors;
1230 }
1231
1232 VLIB_NODE_FN (ip4_sv_reass_handoff_node) (vlib_main_t * vm,
1233                                           vlib_node_runtime_t * node,
1234                                           vlib_frame_t * frame)
1235 {
1236   return ip4_sv_reass_handoff_node_inline (vm, node, frame,
1237                                            false /* is_feature */ );
1238 }
1239
1240
1241 /* *INDENT-OFF* */
1242 VLIB_REGISTER_NODE (ip4_sv_reass_handoff_node) = {
1243   .name = "ip4-sv-reassembly-handoff",
1244   .vector_size = sizeof (u32),
1245   .n_errors = ARRAY_LEN(ip4_sv_reass_handoff_error_strings),
1246   .error_strings = ip4_sv_reass_handoff_error_strings,
1247   .format_trace = format_ip4_sv_reass_handoff_trace,
1248
1249   .n_next_nodes = 1,
1250
1251   .next_nodes = {
1252     [0] = "error-drop",
1253   },
1254 };
1255 /* *INDENT-ON* */
1256
1257
1258 /* *INDENT-OFF* */
1259 VLIB_NODE_FN (ip4_sv_reass_feature_handoff_node) (vlib_main_t * vm,
1260                                                     vlib_node_runtime_t *
1261                                                     node,
1262                                                     vlib_frame_t * frame)
1263 {
1264   return ip4_sv_reass_handoff_node_inline (vm, node, frame,
1265                                              true /* is_feature */ );
1266 }
1267 /* *INDENT-ON* */
1268
1269
1270 /* *INDENT-OFF* */
1271 VLIB_REGISTER_NODE (ip4_sv_reass_feature_handoff_node) = {
1272   .name = "ip4-sv-reass-feature-hoff",
1273   .vector_size = sizeof (u32),
1274   .n_errors = ARRAY_LEN(ip4_sv_reass_handoff_error_strings),
1275   .error_strings = ip4_sv_reass_handoff_error_strings,
1276   .format_trace = format_ip4_sv_reass_handoff_trace,
1277
1278   .n_next_nodes = 1,
1279
1280   .next_nodes = {
1281     [0] = "error-drop",
1282   },
1283 };
1284 /* *INDENT-ON* */
1285
1286 #ifndef CLIB_MARCH_VARIANT
1287 int
1288 ip4_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1289 {
1290   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1291   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1292   if (is_enable)
1293     {
1294       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1295         {
1296           ++rm->feature_use_refcount_per_intf[sw_if_index];
1297           return vnet_feature_enable_disable ("ip4-unicast",
1298                                               "ip4-sv-reassembly-feature",
1299                                               sw_if_index, 1, 0, 0);
1300         }
1301       ++rm->feature_use_refcount_per_intf[sw_if_index];
1302     }
1303   else
1304     {
1305       if (rm->feature_use_refcount_per_intf[sw_if_index])
1306         --rm->feature_use_refcount_per_intf[sw_if_index];
1307       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1308         return vnet_feature_enable_disable ("ip4-unicast",
1309                                             "ip4-sv-reassembly-feature",
1310                                             sw_if_index, 0, 0, 0);
1311     }
1312   return 0;
1313 }
1314
1315 uword
1316 ip4_sv_reass_custom_register_next_node (uword node_index)
1317 {
1318   return vlib_node_add_next (vlib_get_main (), ip4_sv_reass_custom_node.index,
1319                              node_index);
1320 }
1321
1322 int
1323 ip4_sv_reass_output_enable_disable_with_refcnt (u32 sw_if_index,
1324                                                 int is_enable)
1325 {
1326   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1327   vec_validate (rm->output_feature_use_refcount_per_intf, sw_if_index);
1328   if (is_enable)
1329     {
1330       if (!rm->output_feature_use_refcount_per_intf[sw_if_index])
1331         {
1332           ++rm->output_feature_use_refcount_per_intf[sw_if_index];
1333           return vnet_feature_enable_disable ("ip4-output",
1334                                               "ip4-sv-reassembly-output-feature",
1335                                               sw_if_index, 1, 0, 0);
1336         }
1337       ++rm->output_feature_use_refcount_per_intf[sw_if_index];
1338     }
1339   else
1340     {
1341       if (rm->output_feature_use_refcount_per_intf[sw_if_index])
1342         --rm->output_feature_use_refcount_per_intf[sw_if_index];
1343       if (!rm->output_feature_use_refcount_per_intf[sw_if_index])
1344         return vnet_feature_enable_disable ("ip4-output",
1345                                             "ip4-sv-reassembly-output-feature",
1346                                             sw_if_index, 0, 0, 0);
1347     }
1348   return 0;
1349 }
1350 #endif
1351
1352 /*
1353  * fd.io coding-style-patch-verification: ON
1354  *
1355  * Local Variables:
1356  * eval: (c-set-style "gnu")
1357  * End:
1358  */