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.save_rewrite_length =
 470                 vnet_buffer (b0)->ip.save_rewrite_length;
 471               vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
 472               vnet_buffer (b0)->ip.reass.ip_proto = ip0->protocol;
 473               if (IP_PROTOCOL_TCP == ip0->protocol)
 474                 {
 475                   vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 476                     ((tcp_header_t *) (ip0 + 1))->flags;
 477                   vnet_buffer (b0)->ip.reass.tcp_ack_number =
 478                     ((tcp_header_t *) (ip0 + 1))->ack_number;
 479                   vnet_buffer (b0)->ip.reass.tcp_seq_number =
 480                     ((tcp_header_t *) (ip0 + 1))->seq_number;
 481                 }
 482               else if (IP_PROTOCOL_ICMP == ip0->protocol)
 483                 {
 484                   vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 485                     ((icmp46_header_t *) (ip0 + 1))->type;
 486                 }
 487               vnet_buffer (b0)->ip.reass.l4_src_port = ip4_get_port (ip0, 1);
 488               vnet_buffer (b0)->ip.reass.l4_dst_port = ip4_get_port (ip0, 0);
 489               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 490                 {
 491                   ip4_sv_reass_add_trace (vm, node, rm, NULL, bi0,
 492                                           REASS_PASSTHROUGH,
 493                                           vnet_buffer (b0)->ip.reass.ip_proto,
 494                                           vnet_buffer (b0)->ip.
 495                                           reass.l4_src_port,
 496                                           vnet_buffer (b0)->ip.
 497                                           reass.l4_dst_port);
 498                 }
 499               goto packet_enqueue;
 500             }
 501           const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
 502           const u32 fragment_length =
 503             clib_net_to_host_u16 (ip0->length) - ip4_header_bytes (ip0);
 504           const u32 fragment_last = fragment_first + fragment_length - 1;
 505           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
 506             {
 507               next0 = IP4_SV_REASSEMBLY_NEXT_DROP;
 508               error0 = IP4_ERROR_REASS_MALFORMED_PACKET;
 509               goto packet_enqueue;
 510             }
 511           ip4_sv_reass_kv_t kv;
 512           u8 do_handoff = 0;
 513
 514           kv.k.as_u64[0] =
 515             (u64) vec_elt (ip4_main.fib_index_by_sw_if_index,
 516                            vnet_buffer (b0)->sw_if_index[VLIB_RX]) |
 517             (u64) ip0->src_address.as_u32 << 32;
 518           kv.k.as_u64[1] =
 519             (u64) ip0->dst_address.
 520             as_u32 | (u64) ip0->fragment_id << 32 | (u64) ip0->protocol << 48;
 521
 522           ip4_sv_reass_t *reass =
 523             ip4_sv_reass_find_or_create (vm, rm, rt, &kv, &do_handoff);
 524
 525           if (PREDICT_FALSE (do_handoff))
 526             {
 527               next0 = IP4_SV_REASSEMBLY_NEXT_HANDOFF;
 528               vnet_buffer (b0)->ip.reass.owner_thread_index =
 529                 kv.v.thread_index;
 530               goto packet_enqueue;
 531             }
 532
 533           if (!reass)
 534             {
 535               next0 = IP4_SV_REASSEMBLY_NEXT_DROP;
 536               error0 = IP4_ERROR_REASS_LIMIT_REACHED;
 537               goto packet_enqueue;
 538             }
 539
 540           if (reass->is_complete)
 541             {
 542               if (is_custom)
 543                 {
 544                   next0 = vnet_buffer (b0)->ip.reass.next_index;
 545                 }
 546               else
 547                 {
 548                   next0 = IP4_SV_REASSEMBLY_NEXT_INPUT;
 549                 }
 550               vnet_buffer (b0)->ip.reass.save_rewrite_length =
 551                 vnet_buffer (b0)->ip.save_rewrite_length;
 552               vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 553                 ! !fragment_first;
 554               vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 555               vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 556                 reass->icmp_type_or_tcp_flags;
 557               vnet_buffer (b0)->ip.reass.tcp_ack_number =
 558                 reass->tcp_ack_number;
 559               vnet_buffer (b0)->ip.reass.tcp_seq_number =
 560                 reass->tcp_seq_number;
 561               vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 562               vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 563               error0 = IP4_ERROR_NONE;
 564               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 565                 {
 566                   ip4_sv_reass_add_trace (vm, node, rm, reass, bi0,
 567                                           REASS_FRAGMENT_FORWARD,
 568                                           reass->ip_proto,
 569                                           reass->l4_src_port,
 570                                           reass->l4_dst_port);
 571                 }
 572               goto packet_enqueue;
 573             }
 574
 575           ip4_sv_reass_rc_t rc =
 576             ip4_sv_reass_update (vm, node, rm, rt, ip0, reass, bi0);
 577           switch (rc)
 578             {
 579             case IP4_SV_REASS_RC_OK:
 580               /* nothing to do here */
 581               break;
 582             case IP4_SV_REASS_RC_TOO_MANY_FRAGMENTS:
 583               vlib_node_increment_counter (vm, node->node_index,
 584                                            IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
 585                                            1);
 586               ip4_sv_reass_free (vm, rm, rt, reass);
 587               goto next_packet;
 588               break;
 589             case IP4_SV_REASS_RC_UNSUPP_IP_PROTO:
 590               vlib_node_increment_counter (vm, node->node_index,
 591                                            IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
 592                                            1);
 593               ip4_sv_reass_free (vm, rm, rt, reass);
 594               goto next_packet;
 595               break;
 596             }
 597           if (reass->is_complete)
 598             {
 599               u32 idx;
 600               vec_foreach_index (idx, reass->cached_buffers)
 601               {
 602                 u32 bi0 = vec_elt (reass->cached_buffers, idx);
 603                 vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
 604                 u32 next0 = IP4_SV_REASSEMBLY_NEXT_INPUT;
 605                 if (is_feature)
 606                   {
 607                     vnet_feature_next (&next0, b0);
 608                   }
 609                 if (is_custom)
 610                   {
 611                     next0 = vnet_buffer (b0)->ip.reass.next_index;
 612                   }
 613                 if (0 == n_left_to_next)
 614                   {
 615                     vlib_put_next_frame (vm, node, next_index,
 616                                          n_left_to_next);
 617                     vlib_get_next_frame (vm, node, next_index, to_next,
 618                                          n_left_to_next);
 619                   }
 620                 to_next[0] = bi0;
 621                 to_next += 1;
 622                 n_left_to_next -= 1;
 623                 ASSERT (vnet_buffer (b0)->ip.save_rewrite_length < (2 << 14));
 624                 vnet_buffer (b0)->ip.reass.save_rewrite_length =
 625                   vnet_buffer (b0)->ip.save_rewrite_length;
 626                 vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 627                   ! !ip4_get_fragment_offset (vlib_buffer_get_current (b0));
 628                 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 629                 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 630                   reass->icmp_type_or_tcp_flags;
 631                 vnet_buffer (b0)->ip.reass.tcp_ack_number =
 632                   reass->tcp_ack_number;
 633                 vnet_buffer (b0)->ip.reass.tcp_seq_number =
 634                   reass->tcp_seq_number;
 635                 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 636                 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 637                 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 638                   {
 639                     ip4_sv_reass_add_trace (vm, node, rm, reass, bi0,
 640                                             REASS_FRAGMENT_FORWARD,
 641                                             reass->ip_proto,
 642                                             reass->l4_src_port,
 643                                             reass->l4_dst_port);
 644                   }
 645                 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 646                                                  to_next, n_left_to_next, bi0,
 647                                                  next0);
 648               }
 649               _vec_len (reass->cached_buffers) = 0;     // buffers are owned by frame now
 650             }
 651           goto next_packet;
 652
 653         packet_enqueue:
 654           b0->error = node->errors[error0];
 655
 656           to_next[0] = bi0;
 657           to_next += 1;
 658           n_left_to_next -= 1;
 659           if (is_feature && IP4_ERROR_NONE == error0)
 660             {
 661               b0 = vlib_get_buffer (vm, bi0);
 662               vnet_feature_next (&next0, b0);
 663             }
 664           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 665                                            to_next, n_left_to_next,
 666                                            bi0, next0);
 667
 668         next_packet:
 669           from += 1;
 670           n_left_from -= 1;
 671         }
 672
 673       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 674     }
 675
 676   clib_spinlock_unlock (&rt->lock);
 677   return frame->n_vectors;
 678 }
 679
 680 static char *ip4_sv_reass_error_strings[] = {
 681 #define _(sym, string) string,
 682   foreach_ip4_error
 683 #undef _
 684 };
 685
 686 VLIB_NODE_FN (ip4_sv_reass_node) (vlib_main_t * vm,
 687                                   vlib_node_runtime_t * node,
 688                                   vlib_frame_t * frame)
 689 {
 690   return ip4_sv_reass_inline (vm, node, frame, false /* is_feature */ ,
 691                               false /* is_output_feature */ ,
 692                               false /* is_custom */ );
 693 }
 694
 695 /* *INDENT-OFF* */
 696 VLIB_REGISTER_NODE (ip4_sv_reass_node) = {
 697     .name = "ip4-sv-reassembly",
 698     .vector_size = sizeof (u32),
 699     .format_trace = format_ip4_sv_reass_trace,
 700     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
 701     .error_strings = ip4_sv_reass_error_strings,
 702     .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
 703     .next_nodes =
 704         {
 705                 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
 706                 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
 707                 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reassembly-handoff",
 708
 709         },
 710 };
 711 /* *INDENT-ON* */
 712
 713 VLIB_NODE_FN (ip4_sv_reass_node_feature) (vlib_main_t * vm,
 714                                           vlib_node_runtime_t * node,
 715                                           vlib_frame_t * frame)
 716 {
 717   return ip4_sv_reass_inline (vm, node, frame, true /* is_feature */ ,
 718                               false /* is_output_feature */ ,
 719                               false /* is_custom */ );
 720 }
 721
 722 /* *INDENT-OFF* */
 723 VLIB_REGISTER_NODE (ip4_sv_reass_node_feature) = {
 724     .name = "ip4-sv-reassembly-feature",
 725     .vector_size = sizeof (u32),
 726     .format_trace = format_ip4_sv_reass_trace,
 727     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
 728     .error_strings = ip4_sv_reass_error_strings,
 729     .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
 730     .next_nodes =
 731         {
 732                 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
 733                 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
 734                 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reass-feature-hoff",
 735         },
 736 };
 737 /* *INDENT-ON* */
 738
 739 /* *INDENT-OFF* */
 740 VNET_FEATURE_INIT (ip4_sv_reass_feature) = {
 741     .arc_name = "ip4-unicast",
 742     .node_name = "ip4-sv-reassembly-feature",
 743     .runs_before = VNET_FEATURES ("ip4-lookup"),
 744     .runs_after = 0,
 745 };
 746 /* *INDENT-ON* */
 747
 748 VLIB_NODE_FN (ip4_sv_reass_node_output_feature) (vlib_main_t * vm,
 749                                                  vlib_node_runtime_t * node,
 750                                                  vlib_frame_t * frame)
 751 {
 752   return ip4_sv_reass_inline (vm, node, frame, true /* is_feature */ ,
 753                               true /* is_output_feature */ ,
 754                               false /* is_custom */ );
 755 }
 756
 757
 758 /* *INDENT-OFF* */
 759 VLIB_REGISTER_NODE (ip4_sv_reass_node_output_feature) = {
 760     .name = "ip4-sv-reassembly-output-feature",
 761     .vector_size = sizeof (u32),
 762     .format_trace = format_ip4_sv_reass_trace,
 763     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
 764     .error_strings = ip4_sv_reass_error_strings,
 765     .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
 766     .next_nodes =
 767         {
 768                 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
 769                 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
 770                 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reass-feature-hoff",
 771         },
 772 };
 773 /* *INDENT-ON* */
 774
 775 /* *INDENT-OFF* */
 776 VNET_FEATURE_INIT (ip4_sv_reass_output_feature) = {
 777     .arc_name = "ip4-output",
 778     .node_name = "ip4-sv-reassembly-output-feature",
 779     .runs_before = 0,
 780     .runs_after = 0,
 781 };
 782 /* *INDENT-ON* */
 783
 784 /* *INDENT-OFF* */
 785 VLIB_REGISTER_NODE (ip4_sv_reass_custom_node) = {
 786     .name = "ip4-sv-reassembly-custom-next",
 787     .vector_size = sizeof (u32),
 788     .format_trace = format_ip4_sv_reass_trace,
 789     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
 790     .error_strings = ip4_sv_reass_error_strings,
 791     .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
 792     .next_nodes =
 793         {
 794                 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
 795                 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
 796                 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reassembly-handoff",
 797
 798         },
 799 };
 800 /* *INDENT-ON* */
 801
 802 VLIB_NODE_FN (ip4_sv_reass_custom_node) (vlib_main_t * vm,
 803                                          vlib_node_runtime_t * node,
 804                                          vlib_frame_t * frame)
 805 {
 806   return ip4_sv_reass_inline (vm, node, frame, false /* is_feature */ ,
 807                               false /* is_output_feature */ ,
 808                               true /* is_custom */ );
 809 }
 810
 811 #ifndef CLIB_MARCH_VARIANT
 812 always_inline u32
 813 ip4_sv_reass_get_nbuckets ()
 814 {
 815   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
 816   u32 nbuckets;
 817   u8 i;
 818
 819   nbuckets = (u32) (rm->max_reass_n / IP4_SV_REASS_HT_LOAD_FACTOR);
 820
 821   for (i = 0; i < 31; i++)
 822     if ((1 << i) >= nbuckets)
 823       break;
 824   nbuckets = 1 << i;
 825
 826   return nbuckets;
 827 }
 828 #endif /* CLIB_MARCH_VARIANT */
 829
 830 typedef enum
 831 {
 832   IP4_EVENT_CONFIG_CHANGED = 1,
 833 } ip4_sv_reass_event_t;
 834
 835 typedef struct
 836 {
 837   int failure;
 838   clib_bihash_16_8_t *new_hash;
 839 } ip4_rehash_cb_ctx;
 840
 841 #ifndef CLIB_MARCH_VARIANT
 842 static int
 843 ip4_rehash_cb (clib_bihash_kv_16_8_t * kv, void *_ctx)
 844 {
 845   ip4_rehash_cb_ctx *ctx = _ctx;
 846   if (clib_bihash_add_del_16_8 (ctx->new_hash, kv, 1))
 847     {
 848       ctx->failure = 1;
 849     }
 850   return (BIHASH_WALK_CONTINUE);
 851 }
 852
 853 static void
 854 ip4_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
 855                          u32 max_reassembly_length,
 856                          u32 expire_walk_interval_ms)
 857 {
 858   ip4_sv_reass_main.timeout_ms = timeout_ms;
 859   ip4_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
 860   ip4_sv_reass_main.max_reass_n = max_reassemblies;
 861   ip4_sv_reass_main.max_reass_len = max_reassembly_length;
 862   ip4_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
 863 }
 864
 865 vnet_api_error_t
 866 ip4_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
 867                   u32 max_reassembly_length, u32 expire_walk_interval_ms)
 868 {
 869   u32 old_nbuckets = ip4_sv_reass_get_nbuckets ();
 870   ip4_sv_reass_set_params (timeout_ms, max_reassemblies,
 871                            max_reassembly_length, expire_walk_interval_ms);
 872   vlib_process_signal_event (ip4_sv_reass_main.vlib_main,
 873                              ip4_sv_reass_main.ip4_sv_reass_expire_node_idx,
 874                              IP4_EVENT_CONFIG_CHANGED, 0);
 875   u32 new_nbuckets = ip4_sv_reass_get_nbuckets ();
 876   if (ip4_sv_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
 877     {
 878       clib_bihash_16_8_t new_hash;
 879       clib_memset (&new_hash, 0, sizeof (new_hash));
 880       ip4_rehash_cb_ctx ctx;
 881       ctx.failure = 0;
 882       ctx.new_hash = &new_hash;
 883       clib_bihash_init_16_8 (&new_hash, "ip4-dr", new_nbuckets,
 884                              new_nbuckets * 1024);
 885       clib_bihash_foreach_key_value_pair_16_8 (&ip4_sv_reass_main.hash,
 886                                                ip4_rehash_cb, &ctx);
 887       if (ctx.failure)
 888         {
 889           clib_bihash_free_16_8 (&new_hash);
 890           return -1;
 891         }
 892       else
 893         {
 894           clib_bihash_free_16_8 (&ip4_sv_reass_main.hash);
 895           clib_memcpy_fast (&ip4_sv_reass_main.hash, &new_hash,
 896                             sizeof (ip4_sv_reass_main.hash));
 897           clib_bihash_copied (&ip4_sv_reass_main.hash, &new_hash);
 898         }
 899     }
 900   return 0;
 901 }
 902
 903 vnet_api_error_t
 904 ip4_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
 905                   u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
 906 {
 907   *timeout_ms = ip4_sv_reass_main.timeout_ms;
 908   *max_reassemblies = ip4_sv_reass_main.max_reass_n;
 909   *max_reassembly_length = ip4_sv_reass_main.max_reass_len;
 910   *expire_walk_interval_ms = ip4_sv_reass_main.expire_walk_interval_ms;
 911   return 0;
 912 }
 913
 914 static clib_error_t *
 915 ip4_sv_reass_init_function (vlib_main_t * vm)
 916 {
 917   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
 918   clib_error_t *error = 0;
 919   u32 nbuckets;
 920   vlib_node_t *node;
 921
 922   rm->vlib_main = vm;
 923   rm->vnet_main = vnet_get_main ();
 924
 925   vec_validate (rm->per_thread_data, vlib_num_workers ());
 926   ip4_sv_reass_per_thread_t *rt;
 927   vec_foreach (rt, rm->per_thread_data)
 928   {
 929     clib_spinlock_init (&rt->lock);
 930     pool_alloc (rt->pool, rm->max_reass_n);
 931     rt->lru_first = rt->lru_last = ~0;
 932   }
 933
 934   node = vlib_get_node_by_name (vm, (u8 *) "ip4-sv-reassembly-expire-walk");
 935   ASSERT (node);
 936   rm->ip4_sv_reass_expire_node_idx = node->index;
 937
 938   ip4_sv_reass_set_params (IP4_SV_REASS_TIMEOUT_DEFAULT_MS,
 939                            IP4_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
 940                            IP4_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
 941                            IP4_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
 942
 943   nbuckets = ip4_sv_reass_get_nbuckets ();
 944   clib_bihash_init_16_8 (&rm->hash, "ip4-dr", nbuckets, nbuckets * 1024);
 945
 946   node = vlib_get_node_by_name (vm, (u8 *) "ip4-drop");
 947   ASSERT (node);
 948   rm->ip4_drop_idx = node->index;
 949
 950   rm->fq_index = vlib_frame_queue_main_init (ip4_sv_reass_node.index, 0);
 951   rm->fq_feature_index =
 952     vlib_frame_queue_main_init (ip4_sv_reass_node_feature.index, 0);
 953
 954   rm->feature_use_refcount_per_intf = NULL;
 955   rm->output_feature_use_refcount_per_intf = NULL;
 956
 957   return error;
 958 }
 959
 960 VLIB_INIT_FUNCTION (ip4_sv_reass_init_function);
 961 #endif /* CLIB_MARCH_VARIANT */
 962
 963 static uword
 964 ip4_sv_reass_walk_expired (vlib_main_t * vm,
 965                            vlib_node_runtime_t * node, vlib_frame_t * f)
 966 {
 967   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
 968   uword event_type, *event_data = 0;
 969
 970   while (true)
 971     {
 972       vlib_process_wait_for_event_or_clock (vm,
 973                                             (f64)
 974                                             rm->expire_walk_interval_ms /
 975                                             (f64) MSEC_PER_SEC);
 976       event_type = vlib_process_get_events (vm, &event_data);
 977
 978       switch (event_type)
 979         {
 980         case ~0:                /* no events => timeout */
 981           /* nothing to do here */
 982           break;
 983         case IP4_EVENT_CONFIG_CHANGED:
 984           break;
 985         default:
 986           clib_warning ("BUG: event type 0x%wx", event_type);
 987           break;
 988         }
 989       f64 now = vlib_time_now (vm);
 990
 991       ip4_sv_reass_t *reass;
 992       int *pool_indexes_to_free = NULL;
 993
 994       uword thread_index = 0;
 995       int index;
 996       const uword nthreads = vlib_num_workers () + 1;
 997       for (thread_index = 0; thread_index < nthreads; ++thread_index)
 998         {
 999           ip4_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1000           clib_spinlock_lock (&rt->lock);
1001
1002           vec_reset_length (pool_indexes_to_free);
1003           /* *INDENT-OFF* */
1004           pool_foreach_index (index, rt->pool, ({
1005                                 reass = pool_elt_at_index (rt->pool, index);
1006                                 if (now > reass->last_heard + rm->timeout)
1007                                   {
1008                                     vec_add1 (pool_indexes_to_free, index);
1009                                   }
1010                               }));
1011           /* *INDENT-ON* */
1012           int *i;
1013           /* *INDENT-OFF* */
1014           vec_foreach (i, pool_indexes_to_free)
1015           {
1016             ip4_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1017             ip4_sv_reass_free (vm, rm, rt, reass);
1018           }
1019           /* *INDENT-ON* */
1020
1021           clib_spinlock_unlock (&rt->lock);
1022         }
1023
1024       vec_free (pool_indexes_to_free);
1025       if (event_data)
1026         {
1027           _vec_len (event_data) = 0;
1028         }
1029     }
1030
1031   return 0;
1032 }
1033
1034 /* *INDENT-OFF* */
1035 VLIB_REGISTER_NODE (ip4_sv_reass_expire_node) = {
1036     .function = ip4_sv_reass_walk_expired,
1037     .type = VLIB_NODE_TYPE_PROCESS,
1038     .name = "ip4-sv-reassembly-expire-walk",
1039     .format_trace = format_ip4_sv_reass_trace,
1040     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
1041     .error_strings = ip4_sv_reass_error_strings,
1042
1043 };
1044 /* *INDENT-ON* */
1045
1046 static u8 *
1047 format_ip4_sv_reass_key (u8 * s, va_list * args)
1048 {
1049   ip4_sv_reass_key_t *key = va_arg (*args, ip4_sv_reass_key_t *);
1050   s =
1051     format (s,
1052             "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1053             key->xx_id, format_ip4_address, &key->src, format_ip4_address,
1054             &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1055   return s;
1056 }
1057
1058 static u8 *
1059 format_ip4_sv_reass (u8 * s, va_list * args)
1060 {
1061   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1062   ip4_sv_reass_t *reass = va_arg (*args, ip4_sv_reass_t *);
1063
1064   s = format (s, "ID: %lu, key: %U trace_op_counter: %u\n",
1065               reass->id, format_ip4_sv_reass_key, &reass->key,
1066               reass->trace_op_counter);
1067
1068   vlib_buffer_t *b;
1069   u32 *bip;
1070   u32 counter = 0;
1071   vec_foreach (bip, reass->cached_buffers)
1072   {
1073     u32 bi = *bip;
1074     do
1075       {
1076         b = vlib_get_buffer (vm, bi);
1077         s = format (s, "  #%03u: bi: %u, ", counter, bi);
1078         ++counter;
1079         bi = b->next_buffer;
1080       }
1081     while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1082   }
1083   return s;
1084 }
1085
1086 static clib_error_t *
1087 show_ip4_reass (vlib_main_t * vm,
1088                 unformat_input_t * input,
1089                 CLIB_UNUSED (vlib_cli_command_t * lmd))
1090 {
1091   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1092
1093   vlib_cli_output (vm, "---------------------");
1094   vlib_cli_output (vm, "IP4 reassembly status");
1095   vlib_cli_output (vm, "---------------------");
1096   bool details = false;
1097   if (unformat (input, "details"))
1098     {
1099       details = true;
1100     }
1101
1102   u32 sum_reass_n = 0;
1103   ip4_sv_reass_t *reass;
1104   uword thread_index;
1105   const uword nthreads = vlib_num_workers () + 1;
1106   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1107     {
1108       ip4_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1109       clib_spinlock_lock (&rt->lock);
1110       if (details)
1111         {
1112           /* *INDENT-OFF* */
1113           pool_foreach (reass, rt->pool, {
1114             vlib_cli_output (vm, "%U", format_ip4_sv_reass, vm, reass);
1115           });
1116           /* *INDENT-ON* */
1117         }
1118       sum_reass_n += rt->reass_n;
1119       clib_spinlock_unlock (&rt->lock);
1120     }
1121   vlib_cli_output (vm, "---------------------");
1122   vlib_cli_output (vm, "Current IP4 reassemblies count: %lu\n",
1123                    (long unsigned) sum_reass_n);
1124   vlib_cli_output (vm,
1125                    "Maximum configured concurrent IP4 reassemblies per worker-thread: %lu\n",
1126                    (long unsigned) rm->max_reass_n);
1127   return 0;
1128 }
1129
1130 /* *INDENT-OFF* */
1131 VLIB_CLI_COMMAND (show_ip4_sv_reass_cmd, static) = {
1132     .path = "show ip4-sv-reassembly",
1133     .short_help = "show ip4-sv-reassembly [details]",
1134     .function = show_ip4_reass,
1135 };
1136 /* *INDENT-ON* */
1137
1138 #ifndef CLIB_MARCH_VARIANT
1139 vnet_api_error_t
1140 ip4_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1141 {
1142   return ip4_sv_reass_enable_disable_with_refcnt (sw_if_index,
1143                                                   enable_disable);
1144 }
1145 #endif /* CLIB_MARCH_VARIANT */
1146
1147
1148 #define foreach_ip4_sv_reass_handoff_error                       \
1149 _(CONGESTION_DROP, "congestion drop")
1150
1151
1152 typedef enum
1153 {
1154 #define _(sym,str) IP4_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
1155   foreach_ip4_sv_reass_handoff_error
1156 #undef _
1157     IP4_SV_REASSEMBLY_HANDOFF_N_ERROR,
1158 } ip4_sv_reass_handoff_error_t;
1159
1160 static char *ip4_sv_reass_handoff_error_strings[] = {
1161 #define _(sym,string) string,
1162   foreach_ip4_sv_reass_handoff_error
1163 #undef _
1164 };
1165
1166 typedef struct
1167 {
1168   u32 next_worker_index;
1169 } ip4_sv_reass_handoff_trace_t;
1170
1171 static u8 *
1172 format_ip4_sv_reass_handoff_trace (u8 * s, va_list * args)
1173 {
1174   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1175   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1176   ip4_sv_reass_handoff_trace_t *t =
1177     va_arg (*args, ip4_sv_reass_handoff_trace_t *);
1178
1179   s =
1180     format (s, "ip4-sv-reassembly-handoff: next-worker %d",
1181             t->next_worker_index);
1182
1183   return s;
1184 }
1185
1186 always_inline uword
1187 ip4_sv_reass_handoff_node_inline (vlib_main_t * vm,
1188                                   vlib_node_runtime_t * node,
1189                                   vlib_frame_t * frame, bool is_feature)
1190 {
1191   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1192
1193   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1194   u32 n_enq, n_left_from, *from;
1195   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1196   u32 fq_index;
1197
1198   from = vlib_frame_vector_args (frame);
1199   n_left_from = frame->n_vectors;
1200   vlib_get_buffers (vm, from, bufs, n_left_from);
1201
1202   b = bufs;
1203   ti = thread_indices;
1204
1205   fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1206
1207   while (n_left_from > 0)
1208     {
1209       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1210
1211       if (PREDICT_FALSE
1212           ((node->flags & VLIB_NODE_FLAG_TRACE)
1213            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1214         {
1215           ip4_sv_reass_handoff_trace_t *t =
1216             vlib_add_trace (vm, node, b[0], sizeof (*t));
1217           t->next_worker_index = ti[0];
1218         }
1219
1220       n_left_from -= 1;
1221       ti += 1;
1222       b += 1;
1223     }
1224   n_enq =
1225     vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1226                                    frame->n_vectors, 1);
1227
1228   if (n_enq < frame->n_vectors)
1229     vlib_node_increment_counter (vm, node->node_index,
1230                                  IP4_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1231                                  frame->n_vectors - n_enq);
1232   return frame->n_vectors;
1233 }
1234
1235 VLIB_NODE_FN (ip4_sv_reass_handoff_node) (vlib_main_t * vm,
1236                                           vlib_node_runtime_t * node,
1237                                           vlib_frame_t * frame)
1238 {
1239   return ip4_sv_reass_handoff_node_inline (vm, node, frame,
1240                                            false /* is_feature */ );
1241 }
1242
1243
1244 /* *INDENT-OFF* */
1245 VLIB_REGISTER_NODE (ip4_sv_reass_handoff_node) = {
1246   .name = "ip4-sv-reassembly-handoff",
1247   .vector_size = sizeof (u32),
1248   .n_errors = ARRAY_LEN(ip4_sv_reass_handoff_error_strings),
1249   .error_strings = ip4_sv_reass_handoff_error_strings,
1250   .format_trace = format_ip4_sv_reass_handoff_trace,
1251
1252   .n_next_nodes = 1,
1253
1254   .next_nodes = {
1255     [0] = "error-drop",
1256   },
1257 };
1258 /* *INDENT-ON* */
1259
1260
1261 /* *INDENT-OFF* */
1262 VLIB_NODE_FN (ip4_sv_reass_feature_handoff_node) (vlib_main_t * vm,
1263                                                     vlib_node_runtime_t *
1264                                                     node,
1265                                                     vlib_frame_t * frame)
1266 {
1267   return ip4_sv_reass_handoff_node_inline (vm, node, frame,
1268                                              true /* is_feature */ );
1269 }
1270 /* *INDENT-ON* */
1271
1272
1273 /* *INDENT-OFF* */
1274 VLIB_REGISTER_NODE (ip4_sv_reass_feature_handoff_node) = {
1275   .name = "ip4-sv-reass-feature-hoff",
1276   .vector_size = sizeof (u32),
1277   .n_errors = ARRAY_LEN(ip4_sv_reass_handoff_error_strings),
1278   .error_strings = ip4_sv_reass_handoff_error_strings,
1279   .format_trace = format_ip4_sv_reass_handoff_trace,
1280
1281   .n_next_nodes = 1,
1282
1283   .next_nodes = {
1284     [0] = "error-drop",
1285   },
1286 };
1287 /* *INDENT-ON* */
1288
1289 #ifndef CLIB_MARCH_VARIANT
1290 int
1291 ip4_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1292 {
1293   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1294   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1295   if (is_enable)
1296     {
1297       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1298         {
1299           ++rm->feature_use_refcount_per_intf[sw_if_index];
1300           return vnet_feature_enable_disable ("ip4-unicast",
1301                                               "ip4-sv-reassembly-feature",
1302                                               sw_if_index, 1, 0, 0);
1303         }
1304       ++rm->feature_use_refcount_per_intf[sw_if_index];
1305     }
1306   else
1307     {
1308       if (rm->feature_use_refcount_per_intf[sw_if_index])
1309         --rm->feature_use_refcount_per_intf[sw_if_index];
1310       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1311         return vnet_feature_enable_disable ("ip4-unicast",
1312                                             "ip4-sv-reassembly-feature",
1313                                             sw_if_index, 0, 0, 0);
1314     }
1315   return 0;
1316 }
1317
1318 uword
1319 ip4_sv_reass_custom_register_next_node (uword node_index)
1320 {
1321   return vlib_node_add_next (vlib_get_main (), ip4_sv_reass_custom_node.index,
1322                              node_index);
1323 }
1324
1325 int
1326 ip4_sv_reass_output_enable_disable_with_refcnt (u32 sw_if_index,
1327                                                 int is_enable)
1328 {
1329   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1330   vec_validate (rm->output_feature_use_refcount_per_intf, sw_if_index);
1331   if (is_enable)
1332     {
1333       if (!rm->output_feature_use_refcount_per_intf[sw_if_index])
1334         {
1335           ++rm->output_feature_use_refcount_per_intf[sw_if_index];
1336           return vnet_feature_enable_disable ("ip4-output",
1337                                               "ip4-sv-reassembly-output-feature",
1338                                               sw_if_index, 1, 0, 0);
1339         }
1340       ++rm->output_feature_use_refcount_per_intf[sw_if_index];
1341     }
1342   else
1343     {
1344       if (rm->output_feature_use_refcount_per_intf[sw_if_index])
1345         --rm->output_feature_use_refcount_per_intf[sw_if_index];
1346       if (!rm->output_feature_use_refcount_per_intf[sw_if_index])
1347         return vnet_feature_enable_disable ("ip4-output",
1348                                             "ip4-sv-reassembly-output-feature",
1349                                             sw_if_index, 0, 0, 0);
1350     }
1351   return 0;
1352 }
1353 #endif
1354
1355 /*
1356  * fd.io coding-style-patch-verification: ON
1357  *
1358  * Local Variables:
1359  * eval: (c-set-style "gnu")
1360  * End:
1361  */