src/vnet/ip/reass/ip4_sv_reass.c

   1 /*
   2  * Copyright (c) 2017 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 /**
  17  * @file
  18  * @brief IPv4 Shallow Virtual Reassembly.
  19  *
  20  * This file contains the source code for IPv4 Shallow Virtual reassembly.
  21  */
  22
  23 #include <vppinfra/vec.h>
  24 #include <vnet/vnet.h>
  25 #include <vnet/ip/ip.h>
  26 #include <vnet/ip/ip4_to_ip6.h>
  27 #include <vppinfra/fifo.h>
  28 #include <vppinfra/bihash_16_8.h>
  29 #include <vnet/ip/reass/ip4_sv_reass.h>
  30
  31 #define MSEC_PER_SEC 1000
  32 #define IP4_SV_REASS_TIMEOUT_DEFAULT_MS 100
  33 #define IP4_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000      // 10 seconds default
  34 #define IP4_SV_REASS_MAX_REASSEMBLIES_DEFAULT 1024
  35 #define IP4_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
  36 #define IP4_SV_REASS_HT_LOAD_FACTOR (0.75)
  37
  38 typedef enum
  39 {
  40   IP4_SV_REASS_RC_OK,
  41   IP4_SV_REASS_RC_TOO_MANY_FRAGMENTS,
  42   IP4_SV_REASS_RC_UNSUPP_IP_PROTO,
  43 } ip4_sv_reass_rc_t;
  44
  45 typedef struct
  46 {
  47   union
  48   {
  49     struct
  50     {
  51       u32 xx_id;
  52       ip4_address_t src;
  53       ip4_address_t dst;
  54       u16 frag_id;
  55       u8 proto;
  56       u8 unused;
  57     };
  58     u64 as_u64[2];
  59   };
  60 } ip4_sv_reass_key_t;
  61
  62 typedef union
  63 {
  64   struct
  65   {
  66     u32 reass_index;
  67     u32 thread_index;
  68   };
  69   u64 as_u64;
  70 } ip4_sv_reass_val_t;
  71
  72 typedef union
  73 {
  74   struct
  75   {
  76     ip4_sv_reass_key_t k;
  77     ip4_sv_reass_val_t v;
  78   };
  79   clib_bihash_kv_16_8_t kv;
  80 } ip4_sv_reass_kv_t;
  81
  82 typedef struct
  83 {
  84   // hash table key
  85   ip4_sv_reass_key_t key;
  86   // time when last packet was received
  87   f64 last_heard;
  88   // internal id of this reassembly
  89   u64 id;
  90   // trace operation counter
  91   u32 trace_op_counter;
  92   // minimum fragment length for this reassembly - used to estimate MTU
  93   u16 min_fragment_length;
  94   // buffer indexes of buffers in this reassembly in chronological order -
  95   // including overlaps and duplicate fragments
  96   u32 *cached_buffers;
  97   // set to true when this reassembly is completed
  98   bool is_complete;
  99   // ip protocol
 100   u8 ip_proto;
 101   u8 icmp_type_or_tcp_flags;
 102   u32 tcp_ack_number;
 103   u32 tcp_seq_number;
 104   // l4 src port
 105   u16 l4_src_port;
 106   // l4 dst port
 107   u16 l4_dst_port;
 108   u32 next_index;
 109   // lru indexes
 110   u32 lru_prev;
 111   u32 lru_next;
 112 } ip4_sv_reass_t;
 113
 114 typedef struct
 115 {
 116   ip4_sv_reass_t *pool;
 117   u32 reass_n;
 118   u32 id_counter;
 119   clib_spinlock_t lock;
 120   // lru indexes
 121   u32 lru_first;
 122   u32 lru_last;
 123
 124 } ip4_sv_reass_per_thread_t;
 125
 126 typedef struct
 127 {
 128   // IPv4 config
 129   u32 timeout_ms;
 130   f64 timeout;
 131   u32 expire_walk_interval_ms;
 132   // maximum number of fragments in one reassembly
 133   u32 max_reass_len;
 134   // maximum number of reassemblies
 135   u32 max_reass_n;
 136
 137   // IPv4 runtime
 138   clib_bihash_16_8_t hash;
 139   // per-thread data
 140   ip4_sv_reass_per_thread_t *per_thread_data;
 141
 142   // convenience
 143   vlib_main_t *vlib_main;
 144   vnet_main_t *vnet_main;
 145
 146   // node index of ip4-drop node
 147   u32 ip4_drop_idx;
 148   u32 ip4_sv_reass_expire_node_idx;
 149
 150   /** Worker handoff */
 151   u32 fq_index;
 152   u32 fq_feature_index;
 153
 154   // reference count for enabling/disabling feature - per interface
 155   u32 *feature_use_refcount_per_intf;
 156
 157   // reference count for enabling/disabling feature - per interface
 158   u32 *output_feature_use_refcount_per_intf;
 159
 160 } ip4_sv_reass_main_t;
 161
 162 extern ip4_sv_reass_main_t ip4_sv_reass_main;
 163
 164 #ifndef CLIB_MARCH_VARIANT
 165 ip4_sv_reass_main_t ip4_sv_reass_main;
 166 #endif /* CLIB_MARCH_VARIANT */
 167
 168 typedef enum
 169 {
 170   IP4_SV_REASSEMBLY_NEXT_INPUT,
 171   IP4_SV_REASSEMBLY_NEXT_DROP,
 172   IP4_SV_REASSEMBLY_NEXT_HANDOFF,
 173   IP4_SV_REASSEMBLY_N_NEXT,
 174 } ip4_sv_reass_next_t;
 175
 176 typedef enum
 177 {
 178   REASS_FRAGMENT_CACHE,
 179   REASS_FINISH,
 180   REASS_FRAGMENT_FORWARD,
 181   REASS_PASSTHROUGH,
 182 } ip4_sv_reass_trace_operation_e;
 183
 184 typedef struct
 185 {
 186   ip4_sv_reass_trace_operation_e action;
 187   u32 reass_id;
 188   u32 op_id;
 189   u8 ip_proto;
 190   u16 l4_src_port;
 191   u16 l4_dst_port;
 192 } ip4_sv_reass_trace_t;
 193
 194 extern vlib_node_registration_t ip4_sv_reass_node;
 195 extern vlib_node_registration_t ip4_sv_reass_node_feature;
 196
 197 static u8 *
 198 format_ip4_sv_reass_trace (u8 * s, va_list * args)
 199 {
 200   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 201   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 202   ip4_sv_reass_trace_t *t = va_arg (*args, ip4_sv_reass_trace_t *);
 203   if (REASS_PASSTHROUGH != t->action)
 204     {
 205       s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
 206     }
 207   switch (t->action)
 208     {
 209     case REASS_FRAGMENT_CACHE:
 210       s = format (s, "[cached]");
 211       break;
 212     case REASS_FINISH:
 213       s =
 214         format (s, "[finish, ip proto=%u, src_port=%u, dst_port=%u]",
 215                 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
 216                 clib_net_to_host_u16 (t->l4_dst_port));
 217       break;
 218     case REASS_FRAGMENT_FORWARD:
 219       s =
 220         format (s, "[forward, ip proto=%u, src_port=%u, dst_port=%u]",
 221                 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
 222                 clib_net_to_host_u16 (t->l4_dst_port));
 223       break;
 224     case REASS_PASSTHROUGH:
 225       s = format (s, "[not-fragmented]");
 226       break;
 227     }
 228   return s;
 229 }
 230
 231 static void
 232 ip4_sv_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 233                         ip4_sv_reass_main_t * rm, ip4_sv_reass_t * reass,
 234                         u32 bi, ip4_sv_reass_trace_operation_e action,
 235                         u32 ip_proto, u16 l4_src_port, u16 l4_dst_port)
 236 {
 237   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 238   ip4_sv_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 239   if (reass)
 240     {
 241       t->reass_id = reass->id;
 242       t->op_id = reass->trace_op_counter;
 243       ++reass->trace_op_counter;
 244     }
 245   t->action = action;
 246   t->ip_proto = ip_proto;
 247   t->l4_src_port = l4_src_port;
 248   t->l4_dst_port = l4_dst_port;
 249 #if 0
 250   static u8 *s = NULL;
 251   s = format (s, "%U", format_ip4_sv_reass_trace, NULL, NULL, t);
 252   printf ("%.*s\n", vec_len (s), s);
 253   fflush (stdout);
 254   vec_reset_length (s);
 255 #endif
 256 }
 257
 258
 259 always_inline void
 260 ip4_sv_reass_free (vlib_main_t * vm, ip4_sv_reass_main_t * rm,
 261                    ip4_sv_reass_per_thread_t * rt, ip4_sv_reass_t * reass)
 262 {
 263   clib_bihash_kv_16_8_t kv;
 264   kv.key[0] = reass->key.as_u64[0];
 265   kv.key[1] = reass->key.as_u64[1];
 266   clib_bihash_add_del_16_8 (&rm->hash, &kv, 0);
 267   vlib_buffer_free (vm, reass->cached_buffers,
 268                     vec_len (reass->cached_buffers));
 269   vec_free (reass->cached_buffers);
 270   reass->cached_buffers = NULL;
 271   if (~0 != reass->lru_prev)
 272     {
 273       ip4_sv_reass_t *lru_prev =
 274         pool_elt_at_index (rt->pool, reass->lru_prev);
 275       lru_prev->lru_next = reass->lru_next;
 276     }
 277   if (~0 != reass->lru_next)
 278     {
 279       ip4_sv_reass_t *lru_next =
 280         pool_elt_at_index (rt->pool, reass->lru_next);
 281       lru_next->lru_prev = reass->lru_prev;
 282     }
 283   if (rt->lru_first == reass - rt->pool)
 284     {
 285       rt->lru_first = reass->lru_next;
 286     }
 287   if (rt->lru_last == reass - rt->pool)
 288     {
 289       rt->lru_last = reass->lru_prev;
 290     }
 291   pool_put (rt->pool, reass);
 292   --rt->reass_n;
 293 }
 294
 295 always_inline void
 296 ip4_sv_reass_init (ip4_sv_reass_t * reass)
 297 {
 298   reass->cached_buffers = NULL;
 299   reass->is_complete = false;
 300 }
 301
 302 always_inline ip4_sv_reass_t *
 303 ip4_sv_reass_find_or_create (vlib_main_t * vm, ip4_sv_reass_main_t * rm,
 304                              ip4_sv_reass_per_thread_t * rt,
 305                              ip4_sv_reass_kv_t * kv, u8 * do_handoff)
 306 {
 307   ip4_sv_reass_t *reass = NULL;
 308   f64 now = vlib_time_now (vm);
 309
 310   if (!clib_bihash_search_16_8 (&rm->hash, &kv->kv, &kv->kv))
 311     {
 312       if (vm->thread_index != kv->v.thread_index)
 313         {
 314           *do_handoff = 1;
 315           return NULL;
 316         }
 317       reass = pool_elt_at_index (rt->pool, kv->v.reass_index);
 318
 319       if (now > reass->last_heard + rm->timeout)
 320         {
 321           ip4_sv_reass_free (vm, rm, rt, reass);
 322           reass = NULL;
 323         }
 324     }
 325
 326   if (reass)
 327     {
 328       reass->last_heard = now;
 329       return reass;
 330     }
 331
 332   if (rt->reass_n >= rm->max_reass_n && rm->max_reass_n)
 333     {
 334       reass = pool_elt_at_index (rt->pool, rt->lru_first);
 335       ip4_sv_reass_free (vm, rm, rt, reass);
 336     }
 337
 338   pool_get (rt->pool, reass);
 339   clib_memset (reass, 0, sizeof (*reass));
 340   reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 341   ++rt->id_counter;
 342   ip4_sv_reass_init (reass);
 343   ++rt->reass_n;
 344   reass->lru_prev = reass->lru_next = ~0;
 345
 346   if (~0 != rt->lru_last)
 347     {
 348       ip4_sv_reass_t *lru_last = pool_elt_at_index (rt->pool, rt->lru_last);
 349       reass->lru_prev = rt->lru_last;
 350       lru_last->lru_next = rt->lru_last = reass - rt->pool;
 351     }
 352
 353   if (~0 == rt->lru_first)
 354     {
 355       rt->lru_first = rt->lru_last = reass - rt->pool;
 356     }
 357
 358   reass->key.as_u64[0] = kv->kv.key[0];
 359   reass->key.as_u64[1] = kv->kv.key[1];
 360   kv->v.reass_index = (reass - rt->pool);
 361   kv->v.thread_index = vm->thread_index;
 362   reass->last_heard = now;
 363
 364   if (clib_bihash_add_del_16_8 (&rm->hash, &kv->kv, 1))
 365     {
 366       ip4_sv_reass_free (vm, rm, rt, reass);
 367       reass = NULL;
 368     }
 369
 370   return reass;
 371 }
 372
 373 always_inline ip4_sv_reass_rc_t
 374 ip4_sv_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 375                      ip4_sv_reass_main_t * rm, ip4_sv_reass_per_thread_t * rt,
 376                      ip4_header_t * ip0, ip4_sv_reass_t * reass, u32 bi0)
 377 {
 378   vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
 379   ip4_sv_reass_rc_t rc = IP4_SV_REASS_RC_OK;
 380   const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
 381   if (0 == fragment_first)
 382     {
 383       reass->ip_proto = ip0->protocol;
 384       reass->l4_src_port = ip4_get_port (ip0, 1);
 385       reass->l4_dst_port = ip4_get_port (ip0, 0);
 386       if (!reass->l4_src_port || !reass->l4_dst_port)
 387         return IP4_SV_REASS_RC_UNSUPP_IP_PROTO;
 388       if (IP_PROTOCOL_TCP == reass->ip_proto)
 389         {
 390           reass->icmp_type_or_tcp_flags = ((tcp_header_t *) (ip0 + 1))->flags;
 391           reass->tcp_ack_number = ((tcp_header_t *) (ip0 + 1))->ack_number;
 392           reass->tcp_seq_number = ((tcp_header_t *) (ip0 + 1))->seq_number;
 393         }
 394       else if (IP_PROTOCOL_ICMP == reass->ip_proto)
 395         {
 396           reass->icmp_type_or_tcp_flags =
 397             ((icmp46_header_t *) (ip0 + 1))->type;
 398         }
 399       reass->is_complete = true;
 400       vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
 401       if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 402         {
 403           ip4_sv_reass_add_trace (vm, node, rm, reass, bi0, REASS_FINISH,
 404                                   reass->ip_proto, reass->l4_src_port,
 405                                   reass->l4_dst_port);
 406         }
 407     }
 408   vec_add1 (reass->cached_buffers, bi0);
 409   if (!reass->is_complete)
 410     {
 411       if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 412         {
 413           ip4_sv_reass_add_trace (vm, node, rm, reass, bi0,
 414                                   REASS_FRAGMENT_CACHE, ~0, ~0, ~0);
 415         }
 416       if (vec_len (reass->cached_buffers) > rm->max_reass_len)
 417         {
 418           rc = IP4_SV_REASS_RC_TOO_MANY_FRAGMENTS;
 419         }
 420     }
 421   return rc;
 422 }
 423
 424 always_inline uword
 425 ip4_sv_reass_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 426                      vlib_frame_t * frame, bool is_feature,
 427                      bool is_output_feature, bool is_custom)
 428 {
 429   u32 *from = vlib_frame_vector_args (frame);
 430   u32 n_left_from, n_left_to_next, *to_next, next_index;
 431   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
 432   ip4_sv_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
 433   clib_spinlock_lock (&rt->lock);
 434
 435   n_left_from = frame->n_vectors;
 436   next_index = node->cached_next_index;
 437
 438   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
 439   vlib_get_buffers (vm, from, bufs, n_left_from);
 440   u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
 441   b = bufs;
 442
 443   /* optimistic case first - no fragments */
 444   while (n_left_from >= 2)
 445     {
 446       vlib_buffer_t *b0, *b1;
 447       u32 next0, next1;
 448       b0 = *b;
 449       b++;
 450       b1 = *b;
 451       b++;
 452
 453       /* Prefetch next iteration. */
 454       if (PREDICT_TRUE (n_left_from >= 4))
 455         {
 456           vlib_buffer_t *p2, *p3;
 457
 458           p2 = *b;
 459           p3 = *(b + 1);
 460
 461           vlib_prefetch_buffer_header (p2, LOAD);
 462           vlib_prefetch_buffer_header (p3, LOAD);
 463
 464           CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, LOAD);
 465           CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, LOAD);
 466         }
 467
 468       ip4_header_t *ip0 =
 469         (ip4_header_t *) u8_ptr_add (vlib_buffer_get_current (b0),
 470                                      (is_output_feature ? 1 : 0) *
 471                                      vnet_buffer (b0)->
 472                                      ip.save_rewrite_length);
 473       ip4_header_t *ip1 =
 474         (ip4_header_t *) u8_ptr_add (vlib_buffer_get_current (b1),
 475                                      (is_output_feature ? 1 : 0) *
 476                                      vnet_buffer (b1)->
 477                                      ip.save_rewrite_length);
 478       if (PREDICT_FALSE
 479           (ip4_get_fragment_more (ip0) || ip4_get_fragment_offset (ip0))
 480           || (ip4_get_fragment_more (ip1) || ip4_get_fragment_offset (ip1)))
 481         {
 482           // fragment found, go slow path
 483           b -= 2;
 484           if (b - bufs > 0)
 485             {
 486               vlib_buffer_enqueue_to_next (vm, node, from, (u16 *) nexts,
 487                                            b - bufs);
 488             }
 489           goto slow_path;
 490         }
 491       if (is_feature)
 492         {
 493           vnet_feature_next (&next0, b0);
 494         }
 495       else
 496         {
 497           next0 = is_custom ? vnet_buffer (b0)->ip.reass.next_index :
 498             IP4_SV_REASSEMBLY_NEXT_INPUT;
 499         }
 500       vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
 501       vnet_buffer (b0)->ip.reass.ip_proto = ip0->protocol;
 502       if (IP_PROTOCOL_TCP == ip0->protocol)
 503         {
 504           vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 505             ((tcp_header_t *) (ip0 + 1))->flags;
 506           vnet_buffer (b0)->ip.reass.tcp_ack_number =
 507             ((tcp_header_t *) (ip0 + 1))->ack_number;
 508           vnet_buffer (b0)->ip.reass.tcp_seq_number =
 509             ((tcp_header_t *) (ip0 + 1))->seq_number;
 510         }
 511       else if (IP_PROTOCOL_ICMP == ip0->protocol)
 512         {
 513           vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 514             ((icmp46_header_t *) (ip0 + 1))->type;
 515         }
 516       vnet_buffer (b0)->ip.reass.l4_src_port = ip4_get_port (ip0, 1);
 517       vnet_buffer (b0)->ip.reass.l4_dst_port = ip4_get_port (ip0, 0);
 518       if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 519         {
 520           ip4_sv_reass_add_trace (vm, node, rm, NULL, from[(b - 2) - bufs],
 521                                   REASS_PASSTHROUGH,
 522                                   vnet_buffer (b0)->ip.reass.ip_proto,
 523                                   vnet_buffer (b0)->ip.reass.l4_src_port,
 524                                   vnet_buffer (b0)->ip.reass.l4_dst_port);
 525         }
 526       if (is_feature)
 527         {
 528           vnet_feature_next (&next1, b1);
 529         }
 530       else
 531         {
 532           next1 = is_custom ? vnet_buffer (b1)->ip.reass.next_index :
 533             IP4_SV_REASSEMBLY_NEXT_INPUT;
 534         }
 535       vnet_buffer (b1)->ip.reass.is_non_first_fragment = 0;
 536       vnet_buffer (b1)->ip.reass.ip_proto = ip1->protocol;
 537       if (IP_PROTOCOL_TCP == ip1->protocol)
 538         {
 539           vnet_buffer (b1)->ip.reass.icmp_type_or_tcp_flags =
 540             ((tcp_header_t *) (ip1 + 1))->flags;
 541           vnet_buffer (b1)->ip.reass.tcp_ack_number =
 542             ((tcp_header_t *) (ip1 + 1))->ack_number;
 543           vnet_buffer (b1)->ip.reass.tcp_seq_number =
 544             ((tcp_header_t *) (ip1 + 1))->seq_number;
 545         }
 546       else if (IP_PROTOCOL_ICMP == ip1->protocol)
 547         {
 548           vnet_buffer (b1)->ip.reass.icmp_type_or_tcp_flags =
 549             ((icmp46_header_t *) (ip1 + 1))->type;
 550         }
 551       vnet_buffer (b1)->ip.reass.l4_src_port = ip4_get_port (ip1, 1);
 552       vnet_buffer (b1)->ip.reass.l4_dst_port = ip4_get_port (ip1, 0);
 553       if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
 554         {
 555           ip4_sv_reass_add_trace (vm, node, rm, NULL, from[(b - 1) - bufs],
 556                                   REASS_PASSTHROUGH,
 557                                   vnet_buffer (b1)->ip.reass.ip_proto,
 558                                   vnet_buffer (b1)->ip.reass.l4_src_port,
 559                                   vnet_buffer (b1)->ip.reass.l4_dst_port);
 560         }
 561
 562       n_left_from -= 2;
 563       next[0] = next0;
 564       next[1] = next1;
 565       next += 2;
 566     }
 567
 568   while (n_left_from > 0)
 569     {
 570       vlib_buffer_t *b0;
 571       u32 next0;
 572       b0 = *b;
 573       b++;
 574
 575       ip4_header_t *ip0 =
 576         (ip4_header_t *) u8_ptr_add (vlib_buffer_get_current (b0),
 577                                      (is_output_feature ? 1 : 0) *
 578                                      vnet_buffer (b0)->
 579                                      ip.save_rewrite_length);
 580       if (PREDICT_FALSE
 581           (ip4_get_fragment_more (ip0) || ip4_get_fragment_offset (ip0)))
 582         {
 583           // fragment found, go slow path
 584           b -= 1;
 585           if (b - bufs > 0)
 586             {
 587               vlib_buffer_enqueue_to_next (vm, node, from, (u16 *) nexts,
 588                                            b - bufs);
 589             }
 590           goto slow_path;
 591         }
 592       if (is_feature)
 593         {
 594           vnet_feature_next (&next0, b0);
 595         }
 596       else
 597         {
 598           next0 =
 599             is_custom ? vnet_buffer (b0)->ip.
 600             reass.next_index : IP4_SV_REASSEMBLY_NEXT_INPUT;
 601         }
 602       vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
 603       vnet_buffer (b0)->ip.reass.ip_proto = ip0->protocol;
 604       if (IP_PROTOCOL_TCP == ip0->protocol)
 605         {
 606           vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 607             ((tcp_header_t *) (ip0 + 1))->flags;
 608           vnet_buffer (b0)->ip.reass.tcp_ack_number =
 609             ((tcp_header_t *) (ip0 + 1))->ack_number;
 610           vnet_buffer (b0)->ip.reass.tcp_seq_number =
 611             ((tcp_header_t *) (ip0 + 1))->seq_number;
 612         }
 613       else if (IP_PROTOCOL_ICMP == ip0->protocol)
 614         {
 615           vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 616             ((icmp46_header_t *) (ip0 + 1))->type;
 617         }
 618       vnet_buffer (b0)->ip.reass.l4_src_port = ip4_get_port (ip0, 1);
 619       vnet_buffer (b0)->ip.reass.l4_dst_port = ip4_get_port (ip0, 0);
 620       if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 621         {
 622           ip4_sv_reass_add_trace (vm, node, rm, NULL, from[(b - 1) - bufs],
 623                                   REASS_PASSTHROUGH,
 624                                   vnet_buffer (b0)->ip.reass.ip_proto,
 625                                   vnet_buffer (b0)->ip.reass.l4_src_port,
 626                                   vnet_buffer (b0)->ip.reass.l4_dst_port);
 627         }
 628
 629       n_left_from -= 1;
 630       next[0] = next0;
 631       next += 1;
 632     }
 633
 634   vlib_buffer_enqueue_to_next (vm, node, from, (u16 *) nexts,
 635                                frame->n_vectors);
 636
 637   goto done;
 638
 639 slow_path:
 640
 641   from += b - bufs;
 642
 643   while (n_left_from > 0)
 644     {
 645       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 646
 647       while (n_left_from > 0 && n_left_to_next > 0)
 648         {
 649           u32 bi0;
 650           vlib_buffer_t *b0;
 651           u32 next0;
 652           u32 error0 = IP4_ERROR_NONE;
 653
 654           bi0 = from[0];
 655           b0 = vlib_get_buffer (vm, bi0);
 656
 657           ip4_header_t *ip0 =
 658             (ip4_header_t *) u8_ptr_add (vlib_buffer_get_current (b0),
 659                                          (is_output_feature ? 1 : 0) *
 660                                          vnet_buffer (b0)->
 661                                          ip.save_rewrite_length);
 662           if (!ip4_get_fragment_more (ip0) && !ip4_get_fragment_offset (ip0))
 663             {
 664               // this is a regular packet - no fragmentation
 665               if (is_custom)
 666                 {
 667                   next0 = vnet_buffer (b0)->ip.reass.next_index;
 668                 }
 669               else
 670                 {
 671                   next0 = IP4_SV_REASSEMBLY_NEXT_INPUT;
 672                 }
 673               vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
 674               vnet_buffer (b0)->ip.reass.ip_proto = ip0->protocol;
 675               if (IP_PROTOCOL_TCP == ip0->protocol)
 676                 {
 677                   vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 678                     ((tcp_header_t *) (ip0 + 1))->flags;
 679                   vnet_buffer (b0)->ip.reass.tcp_ack_number =
 680                     ((tcp_header_t *) (ip0 + 1))->ack_number;
 681                   vnet_buffer (b0)->ip.reass.tcp_seq_number =
 682                     ((tcp_header_t *) (ip0 + 1))->seq_number;
 683                 }
 684               else if (IP_PROTOCOL_ICMP == ip0->protocol)
 685                 {
 686                   vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 687                     ((icmp46_header_t *) (ip0 + 1))->type;
 688                 }
 689               vnet_buffer (b0)->ip.reass.l4_src_port = ip4_get_port (ip0, 1);
 690               vnet_buffer (b0)->ip.reass.l4_dst_port = ip4_get_port (ip0, 0);
 691               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 692                 {
 693                   ip4_sv_reass_add_trace (vm, node, rm, NULL, bi0,
 694                                           REASS_PASSTHROUGH,
 695                                           vnet_buffer (b0)->ip.reass.ip_proto,
 696                                           vnet_buffer (b0)->ip.
 697                                           reass.l4_src_port,
 698                                           vnet_buffer (b0)->ip.
 699                                           reass.l4_dst_port);
 700                 }
 701               goto packet_enqueue;
 702             }
 703           const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
 704           const u32 fragment_length =
 705             clib_net_to_host_u16 (ip0->length) - ip4_header_bytes (ip0);
 706           const u32 fragment_last = fragment_first + fragment_length - 1;
 707           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
 708             {
 709               next0 = IP4_SV_REASSEMBLY_NEXT_DROP;
 710               error0 = IP4_ERROR_REASS_MALFORMED_PACKET;
 711               b0->error = node->errors[error0];
 712               goto packet_enqueue;
 713             }
 714           ip4_sv_reass_kv_t kv;
 715           u8 do_handoff = 0;
 716
 717           kv.k.as_u64[0] =
 718             (u64) vec_elt (ip4_main.fib_index_by_sw_if_index,
 719                            vnet_buffer (b0)->sw_if_index[VLIB_RX]) |
 720             (u64) ip0->src_address.as_u32 << 32;
 721           kv.k.as_u64[1] =
 722             (u64) ip0->dst_address.
 723             as_u32 | (u64) ip0->fragment_id << 32 | (u64) ip0->protocol << 48;
 724
 725           ip4_sv_reass_t *reass =
 726             ip4_sv_reass_find_or_create (vm, rm, rt, &kv, &do_handoff);
 727
 728           if (PREDICT_FALSE (do_handoff))
 729             {
 730               next0 = IP4_SV_REASSEMBLY_NEXT_HANDOFF;
 731               vnet_buffer (b0)->ip.reass.owner_thread_index =
 732                 kv.v.thread_index;
 733               goto packet_enqueue;
 734             }
 735
 736           if (!reass)
 737             {
 738               next0 = IP4_SV_REASSEMBLY_NEXT_DROP;
 739               error0 = IP4_ERROR_REASS_LIMIT_REACHED;
 740               b0->error = node->errors[error0];
 741               goto packet_enqueue;
 742             }
 743
 744           if (reass->is_complete)
 745             {
 746               if (is_custom)
 747                 {
 748                   next0 = vnet_buffer (b0)->ip.reass.next_index;
 749                 }
 750               else
 751                 {
 752                   next0 = IP4_SV_REASSEMBLY_NEXT_INPUT;
 753                 }
 754               vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 755                 ! !fragment_first;
 756               vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 757               vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 758                 reass->icmp_type_or_tcp_flags;
 759               vnet_buffer (b0)->ip.reass.tcp_ack_number =
 760                 reass->tcp_ack_number;
 761               vnet_buffer (b0)->ip.reass.tcp_seq_number =
 762                 reass->tcp_seq_number;
 763               vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 764               vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 765               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 766                 {
 767                   ip4_sv_reass_add_trace (vm, node, rm, reass, bi0,
 768                                           REASS_FRAGMENT_FORWARD,
 769                                           reass->ip_proto,
 770                                           reass->l4_src_port,
 771                                           reass->l4_dst_port);
 772                 }
 773               goto packet_enqueue;
 774             }
 775
 776           ip4_sv_reass_rc_t rc =
 777             ip4_sv_reass_update (vm, node, rm, rt, ip0, reass, bi0);
 778           switch (rc)
 779             {
 780             case IP4_SV_REASS_RC_OK:
 781               /* nothing to do here */
 782               break;
 783             case IP4_SV_REASS_RC_TOO_MANY_FRAGMENTS:
 784               vlib_node_increment_counter (vm, node->node_index,
 785                                            IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
 786                                            1);
 787               ip4_sv_reass_free (vm, rm, rt, reass);
 788               goto next_packet;
 789               break;
 790             case IP4_SV_REASS_RC_UNSUPP_IP_PROTO:
 791               vlib_node_increment_counter (vm, node->node_index,
 792                                            IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
 793                                            1);
 794               ip4_sv_reass_free (vm, rm, rt, reass);
 795               goto next_packet;
 796               break;
 797             }
 798           if (reass->is_complete)
 799             {
 800               u32 idx;
 801               vec_foreach_index (idx, reass->cached_buffers)
 802               {
 803                 u32 bi0 = vec_elt (reass->cached_buffers, idx);
 804                 vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
 805                 ip0 =
 806                   (ip4_header_t *) u8_ptr_add (vlib_buffer_get_current (b0),
 807                                                (is_output_feature ? 1 : 0) *
 808                                                vnet_buffer (b0)->
 809                                                ip.save_rewrite_length);
 810                 u32 next0 = IP4_SV_REASSEMBLY_NEXT_INPUT;
 811                 if (is_feature)
 812                   {
 813                     vnet_feature_next (&next0, b0);
 814                   }
 815                 if (is_custom)
 816                   {
 817                     next0 = vnet_buffer (b0)->ip.reass.next_index;
 818                   }
 819                 if (0 == n_left_to_next)
 820                   {
 821                     vlib_put_next_frame (vm, node, next_index,
 822                                          n_left_to_next);
 823                     vlib_get_next_frame (vm, node, next_index, to_next,
 824                                          n_left_to_next);
 825                   }
 826                 to_next[0] = bi0;
 827                 to_next += 1;
 828                 n_left_to_next -= 1;
 829                 vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 830                   ! !ip4_get_fragment_offset (ip0);
 831                 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 832                 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 833                   reass->icmp_type_or_tcp_flags;
 834                 vnet_buffer (b0)->ip.reass.tcp_ack_number =
 835                   reass->tcp_ack_number;
 836                 vnet_buffer (b0)->ip.reass.tcp_seq_number =
 837                   reass->tcp_seq_number;
 838                 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 839                 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 840                 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 841                   {
 842                     ip4_sv_reass_add_trace (vm, node, rm, reass, bi0,
 843                                             REASS_FRAGMENT_FORWARD,
 844                                             reass->ip_proto,
 845                                             reass->l4_src_port,
 846                                             reass->l4_dst_port);
 847                   }
 848                 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 849                                                  to_next, n_left_to_next, bi0,
 850                                                  next0);
 851               }
 852               _vec_len (reass->cached_buffers) = 0;     // buffers are owned by frame now
 853             }
 854           goto next_packet;
 855
 856         packet_enqueue:
 857           to_next[0] = bi0;
 858           to_next += 1;
 859           n_left_to_next -= 1;
 860           if (is_feature && IP4_ERROR_NONE == error0)
 861             {
 862               b0 = vlib_get_buffer (vm, bi0);
 863               vnet_feature_next (&next0, b0);
 864             }
 865           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 866                                            to_next, n_left_to_next,
 867                                            bi0, next0);
 868
 869         next_packet:
 870           from += 1;
 871           n_left_from -= 1;
 872         }
 873
 874       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 875     }
 876
 877 done:
 878   clib_spinlock_unlock (&rt->lock);
 879   return frame->n_vectors;
 880 }
 881
 882 static char *ip4_sv_reass_error_strings[] = {
 883 #define _(sym, string) string,
 884   foreach_ip4_error
 885 #undef _
 886 };
 887
 888 VLIB_NODE_FN (ip4_sv_reass_node) (vlib_main_t * vm,
 889                                   vlib_node_runtime_t * node,
 890                                   vlib_frame_t * frame)
 891 {
 892   return ip4_sv_reass_inline (vm, node, frame, false /* is_feature */ ,
 893                               false /* is_output_feature */ ,
 894                               false /* is_custom */ );
 895 }
 896
 897 /* *INDENT-OFF* */
 898 VLIB_REGISTER_NODE (ip4_sv_reass_node) = {
 899     .name = "ip4-sv-reassembly",
 900     .vector_size = sizeof (u32),
 901     .format_trace = format_ip4_sv_reass_trace,
 902     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
 903     .error_strings = ip4_sv_reass_error_strings,
 904     .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
 905     .next_nodes =
 906         {
 907                 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
 908                 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
 909                 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reassembly-handoff",
 910
 911         },
 912 };
 913 /* *INDENT-ON* */
 914
 915 VLIB_NODE_FN (ip4_sv_reass_node_feature) (vlib_main_t * vm,
 916                                           vlib_node_runtime_t * node,
 917                                           vlib_frame_t * frame)
 918 {
 919   return ip4_sv_reass_inline (vm, node, frame, true /* is_feature */ ,
 920                               false /* is_output_feature */ ,
 921                               false /* is_custom */ );
 922 }
 923
 924 /* *INDENT-OFF* */
 925 VLIB_REGISTER_NODE (ip4_sv_reass_node_feature) = {
 926     .name = "ip4-sv-reassembly-feature",
 927     .vector_size = sizeof (u32),
 928     .format_trace = format_ip4_sv_reass_trace,
 929     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
 930     .error_strings = ip4_sv_reass_error_strings,
 931     .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
 932     .next_nodes =
 933         {
 934                 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
 935                 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
 936                 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reass-feature-hoff",
 937         },
 938 };
 939 /* *INDENT-ON* */
 940
 941 /* *INDENT-OFF* */
 942 VNET_FEATURE_INIT (ip4_sv_reass_feature) = {
 943     .arc_name = "ip4-unicast",
 944     .node_name = "ip4-sv-reassembly-feature",
 945     .runs_before = VNET_FEATURES ("ip4-lookup"),
 946     .runs_after = 0,
 947 };
 948 /* *INDENT-ON* */
 949
 950 VLIB_NODE_FN (ip4_sv_reass_node_output_feature) (vlib_main_t * vm,
 951                                                  vlib_node_runtime_t * node,
 952                                                  vlib_frame_t * frame)
 953 {
 954   return ip4_sv_reass_inline (vm, node, frame, true /* is_feature */ ,
 955                               true /* is_output_feature */ ,
 956                               false /* is_custom */ );
 957 }
 958
 959
 960 /* *INDENT-OFF* */
 961 VLIB_REGISTER_NODE (ip4_sv_reass_node_output_feature) = {
 962     .name = "ip4-sv-reassembly-output-feature",
 963     .vector_size = sizeof (u32),
 964     .format_trace = format_ip4_sv_reass_trace,
 965     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
 966     .error_strings = ip4_sv_reass_error_strings,
 967     .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
 968     .next_nodes =
 969         {
 970                 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
 971                 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
 972                 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reass-feature-hoff",
 973         },
 974 };
 975 /* *INDENT-ON* */
 976
 977 /* *INDENT-OFF* */
 978 VNET_FEATURE_INIT (ip4_sv_reass_output_feature) = {
 979     .arc_name = "ip4-output",
 980     .node_name = "ip4-sv-reassembly-output-feature",
 981     .runs_before = 0,
 982     .runs_after = 0,
 983 };
 984 /* *INDENT-ON* */
 985
 986 /* *INDENT-OFF* */
 987 VLIB_REGISTER_NODE (ip4_sv_reass_custom_node) = {
 988     .name = "ip4-sv-reassembly-custom-next",
 989     .vector_size = sizeof (u32),
 990     .format_trace = format_ip4_sv_reass_trace,
 991     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
 992     .error_strings = ip4_sv_reass_error_strings,
 993     .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
 994     .next_nodes =
 995         {
 996                 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
 997                 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
 998                 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reassembly-handoff",
 999
1000         },
1001 };
1002 /* *INDENT-ON* */
1003
1004 VLIB_NODE_FN (ip4_sv_reass_custom_node) (vlib_main_t * vm,
1005                                          vlib_node_runtime_t * node,
1006                                          vlib_frame_t * frame)
1007 {
1008   return ip4_sv_reass_inline (vm, node, frame, false /* is_feature */ ,
1009                               false /* is_output_feature */ ,
1010                               true /* is_custom */ );
1011 }
1012
1013 #ifndef CLIB_MARCH_VARIANT
1014 always_inline u32
1015 ip4_sv_reass_get_nbuckets ()
1016 {
1017   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1018   u32 nbuckets;
1019   u8 i;
1020
1021   nbuckets = (u32) (rm->max_reass_n / IP4_SV_REASS_HT_LOAD_FACTOR);
1022
1023   for (i = 0; i < 31; i++)
1024     if ((1 << i) >= nbuckets)
1025       break;
1026   nbuckets = 1 << i;
1027
1028   return nbuckets;
1029 }
1030 #endif /* CLIB_MARCH_VARIANT */
1031
1032 typedef enum
1033 {
1034   IP4_EVENT_CONFIG_CHANGED = 1,
1035 } ip4_sv_reass_event_t;
1036
1037 typedef struct
1038 {
1039   int failure;
1040   clib_bihash_16_8_t *new_hash;
1041 } ip4_rehash_cb_ctx;
1042
1043 #ifndef CLIB_MARCH_VARIANT
1044 static int
1045 ip4_rehash_cb (clib_bihash_kv_16_8_t * kv, void *_ctx)
1046 {
1047   ip4_rehash_cb_ctx *ctx = _ctx;
1048   if (clib_bihash_add_del_16_8 (ctx->new_hash, kv, 1))
1049     {
1050       ctx->failure = 1;
1051     }
1052   return (BIHASH_WALK_CONTINUE);
1053 }
1054
1055 static void
1056 ip4_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1057                          u32 max_reassembly_length,
1058                          u32 expire_walk_interval_ms)
1059 {
1060   ip4_sv_reass_main.timeout_ms = timeout_ms;
1061   ip4_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1062   ip4_sv_reass_main.max_reass_n = max_reassemblies;
1063   ip4_sv_reass_main.max_reass_len = max_reassembly_length;
1064   ip4_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1065 }
1066
1067 vnet_api_error_t
1068 ip4_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
1069                   u32 max_reassembly_length, u32 expire_walk_interval_ms)
1070 {
1071   u32 old_nbuckets = ip4_sv_reass_get_nbuckets ();
1072   ip4_sv_reass_set_params (timeout_ms, max_reassemblies,
1073                            max_reassembly_length, expire_walk_interval_ms);
1074   vlib_process_signal_event (ip4_sv_reass_main.vlib_main,
1075                              ip4_sv_reass_main.ip4_sv_reass_expire_node_idx,
1076                              IP4_EVENT_CONFIG_CHANGED, 0);
1077   u32 new_nbuckets = ip4_sv_reass_get_nbuckets ();
1078   if (ip4_sv_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1079     {
1080       clib_bihash_16_8_t new_hash;
1081       clib_memset (&new_hash, 0, sizeof (new_hash));
1082       ip4_rehash_cb_ctx ctx;
1083       ctx.failure = 0;
1084       ctx.new_hash = &new_hash;
1085       clib_bihash_init_16_8 (&new_hash, "ip4-dr", new_nbuckets,
1086                              new_nbuckets * 1024);
1087       clib_bihash_foreach_key_value_pair_16_8 (&ip4_sv_reass_main.hash,
1088                                                ip4_rehash_cb, &ctx);
1089       if (ctx.failure)
1090         {
1091           clib_bihash_free_16_8 (&new_hash);
1092           return -1;
1093         }
1094       else
1095         {
1096           clib_bihash_free_16_8 (&ip4_sv_reass_main.hash);
1097           clib_memcpy_fast (&ip4_sv_reass_main.hash, &new_hash,
1098                             sizeof (ip4_sv_reass_main.hash));
1099           clib_bihash_copied (&ip4_sv_reass_main.hash, &new_hash);
1100         }
1101     }
1102   return 0;
1103 }
1104
1105 vnet_api_error_t
1106 ip4_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1107                   u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
1108 {
1109   *timeout_ms = ip4_sv_reass_main.timeout_ms;
1110   *max_reassemblies = ip4_sv_reass_main.max_reass_n;
1111   *max_reassembly_length = ip4_sv_reass_main.max_reass_len;
1112   *expire_walk_interval_ms = ip4_sv_reass_main.expire_walk_interval_ms;
1113   return 0;
1114 }
1115
1116 static clib_error_t *
1117 ip4_sv_reass_init_function (vlib_main_t * vm)
1118 {
1119   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1120   clib_error_t *error = 0;
1121   u32 nbuckets;
1122   vlib_node_t *node;
1123
1124   rm->vlib_main = vm;
1125   rm->vnet_main = vnet_get_main ();
1126
1127   vec_validate (rm->per_thread_data, vlib_num_workers ());
1128   ip4_sv_reass_per_thread_t *rt;
1129   vec_foreach (rt, rm->per_thread_data)
1130   {
1131     clib_spinlock_init (&rt->lock);
1132     pool_alloc (rt->pool, rm->max_reass_n);
1133     rt->lru_first = rt->lru_last = ~0;
1134   }
1135
1136   node = vlib_get_node_by_name (vm, (u8 *) "ip4-sv-reassembly-expire-walk");
1137   ASSERT (node);
1138   rm->ip4_sv_reass_expire_node_idx = node->index;
1139
1140   ip4_sv_reass_set_params (IP4_SV_REASS_TIMEOUT_DEFAULT_MS,
1141                            IP4_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
1142                            IP4_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1143                            IP4_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1144
1145   nbuckets = ip4_sv_reass_get_nbuckets ();
1146   clib_bihash_init_16_8 (&rm->hash, "ip4-dr", nbuckets, nbuckets * 1024);
1147
1148   node = vlib_get_node_by_name (vm, (u8 *) "ip4-drop");
1149   ASSERT (node);
1150   rm->ip4_drop_idx = node->index;
1151
1152   rm->fq_index = vlib_frame_queue_main_init (ip4_sv_reass_node.index, 0);
1153   rm->fq_feature_index =
1154     vlib_frame_queue_main_init (ip4_sv_reass_node_feature.index, 0);
1155
1156   rm->feature_use_refcount_per_intf = NULL;
1157   rm->output_feature_use_refcount_per_intf = NULL;
1158
1159   return error;
1160 }
1161
1162 VLIB_INIT_FUNCTION (ip4_sv_reass_init_function);
1163 #endif /* CLIB_MARCH_VARIANT */
1164
1165 static uword
1166 ip4_sv_reass_walk_expired (vlib_main_t * vm,
1167                            vlib_node_runtime_t * node, vlib_frame_t * f)
1168 {
1169   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1170   uword event_type, *event_data = 0;
1171
1172   while (true)
1173     {
1174       vlib_process_wait_for_event_or_clock (vm,
1175                                             (f64)
1176                                             rm->expire_walk_interval_ms /
1177                                             (f64) MSEC_PER_SEC);
1178       event_type = vlib_process_get_events (vm, &event_data);
1179
1180       switch (event_type)
1181         {
1182         case ~0:                /* no events => timeout */
1183           /* nothing to do here */
1184           break;
1185         case IP4_EVENT_CONFIG_CHANGED:
1186           break;
1187         default:
1188           clib_warning ("BUG: event type 0x%wx", event_type);
1189           break;
1190         }
1191       f64 now = vlib_time_now (vm);
1192
1193       ip4_sv_reass_t *reass;
1194       int *pool_indexes_to_free = NULL;
1195
1196       uword thread_index = 0;
1197       int index;
1198       const uword nthreads = vlib_num_workers () + 1;
1199       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1200         {
1201           ip4_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1202           clib_spinlock_lock (&rt->lock);
1203
1204           vec_reset_length (pool_indexes_to_free);
1205           /* *INDENT-OFF* */
1206           pool_foreach_index (index, rt->pool)  {
1207                                 reass = pool_elt_at_index (rt->pool, index);
1208                                 if (now > reass->last_heard + rm->timeout)
1209                                   {
1210                                     vec_add1 (pool_indexes_to_free, index);
1211                                   }
1212                               }
1213           /* *INDENT-ON* */
1214           int *i;
1215           /* *INDENT-OFF* */
1216           vec_foreach (i, pool_indexes_to_free)
1217           {
1218             ip4_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1219             ip4_sv_reass_free (vm, rm, rt, reass);
1220           }
1221           /* *INDENT-ON* */
1222
1223           clib_spinlock_unlock (&rt->lock);
1224         }
1225
1226       vec_free (pool_indexes_to_free);
1227       if (event_data)
1228         {
1229           _vec_len (event_data) = 0;
1230         }
1231     }
1232
1233   return 0;
1234 }
1235
1236 /* *INDENT-OFF* */
1237 VLIB_REGISTER_NODE (ip4_sv_reass_expire_node) = {
1238     .function = ip4_sv_reass_walk_expired,
1239     .type = VLIB_NODE_TYPE_PROCESS,
1240     .name = "ip4-sv-reassembly-expire-walk",
1241     .format_trace = format_ip4_sv_reass_trace,
1242     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
1243     .error_strings = ip4_sv_reass_error_strings,
1244
1245 };
1246 /* *INDENT-ON* */
1247
1248 static u8 *
1249 format_ip4_sv_reass_key (u8 * s, va_list * args)
1250 {
1251   ip4_sv_reass_key_t *key = va_arg (*args, ip4_sv_reass_key_t *);
1252   s =
1253     format (s,
1254             "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1255             key->xx_id, format_ip4_address, &key->src, format_ip4_address,
1256             &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1257   return s;
1258 }
1259
1260 static u8 *
1261 format_ip4_sv_reass (u8 * s, va_list * args)
1262 {
1263   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1264   ip4_sv_reass_t *reass = va_arg (*args, ip4_sv_reass_t *);
1265
1266   s = format (s, "ID: %lu, key: %U trace_op_counter: %u\n",
1267               reass->id, format_ip4_sv_reass_key, &reass->key,
1268               reass->trace_op_counter);
1269
1270   vlib_buffer_t *b;
1271   u32 *bip;
1272   u32 counter = 0;
1273   vec_foreach (bip, reass->cached_buffers)
1274   {
1275     u32 bi = *bip;
1276     do
1277       {
1278         b = vlib_get_buffer (vm, bi);
1279         s = format (s, "  #%03u: bi: %u, ", counter, bi);
1280         ++counter;
1281         bi = b->next_buffer;
1282       }
1283     while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1284   }
1285   return s;
1286 }
1287
1288 static clib_error_t *
1289 show_ip4_reass (vlib_main_t * vm,
1290                 unformat_input_t * input,
1291                 CLIB_UNUSED (vlib_cli_command_t * lmd))
1292 {
1293   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1294
1295   vlib_cli_output (vm, "---------------------");
1296   vlib_cli_output (vm, "IP4 reassembly status");
1297   vlib_cli_output (vm, "---------------------");
1298   bool details = false;
1299   if (unformat (input, "details"))
1300     {
1301       details = true;
1302     }
1303
1304   u32 sum_reass_n = 0;
1305   ip4_sv_reass_t *reass;
1306   uword thread_index;
1307   const uword nthreads = vlib_num_workers () + 1;
1308   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1309     {
1310       ip4_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1311       clib_spinlock_lock (&rt->lock);
1312       if (details)
1313         {
1314           /* *INDENT-OFF* */
1315           pool_foreach (reass, rt->pool) {
1316             vlib_cli_output (vm, "%U", format_ip4_sv_reass, vm, reass);
1317           }
1318           /* *INDENT-ON* */
1319         }
1320       sum_reass_n += rt->reass_n;
1321       clib_spinlock_unlock (&rt->lock);
1322     }
1323   vlib_cli_output (vm, "---------------------");
1324   vlib_cli_output (vm, "Current IP4 reassemblies count: %lu\n",
1325                    (long unsigned) sum_reass_n);
1326   vlib_cli_output (vm,
1327                    "Maximum configured concurrent shallow virtual IP4 reassemblies per worker-thread: %lu\n",
1328                    (long unsigned) rm->max_reass_n);
1329   vlib_cli_output (vm,
1330                    "Maximum configured shallow virtual IP4 reassembly timeout: %lums\n",
1331                    (long unsigned) rm->timeout_ms);
1332   vlib_cli_output (vm,
1333                    "Maximum configured shallow virtual IP4 reassembly expire walk interval: %lums\n",
1334                    (long unsigned) rm->expire_walk_interval_ms);
1335   return 0;
1336 }
1337
1338 /* *INDENT-OFF* */
1339 VLIB_CLI_COMMAND (show_ip4_sv_reass_cmd, static) = {
1340     .path = "show ip4-sv-reassembly",
1341     .short_help = "show ip4-sv-reassembly [details]",
1342     .function = show_ip4_reass,
1343 };
1344 /* *INDENT-ON* */
1345
1346 #ifndef CLIB_MARCH_VARIANT
1347 vnet_api_error_t
1348 ip4_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1349 {
1350   return ip4_sv_reass_enable_disable_with_refcnt (sw_if_index,
1351                                                   enable_disable);
1352 }
1353 #endif /* CLIB_MARCH_VARIANT */
1354
1355
1356 #define foreach_ip4_sv_reass_handoff_error                       \
1357 _(CONGESTION_DROP, "congestion drop")
1358
1359
1360 typedef enum
1361 {
1362 #define _(sym,str) IP4_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
1363   foreach_ip4_sv_reass_handoff_error
1364 #undef _
1365     IP4_SV_REASSEMBLY_HANDOFF_N_ERROR,
1366 } ip4_sv_reass_handoff_error_t;
1367
1368 static char *ip4_sv_reass_handoff_error_strings[] = {
1369 #define _(sym,string) string,
1370   foreach_ip4_sv_reass_handoff_error
1371 #undef _
1372 };
1373
1374 typedef struct
1375 {
1376   u32 next_worker_index;
1377 } ip4_sv_reass_handoff_trace_t;
1378
1379 static u8 *
1380 format_ip4_sv_reass_handoff_trace (u8 * s, va_list * args)
1381 {
1382   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1383   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1384   ip4_sv_reass_handoff_trace_t *t =
1385     va_arg (*args, ip4_sv_reass_handoff_trace_t *);
1386
1387   s =
1388     format (s, "ip4-sv-reassembly-handoff: next-worker %d",
1389             t->next_worker_index);
1390
1391   return s;
1392 }
1393
1394 always_inline uword
1395 ip4_sv_reass_handoff_node_inline (vlib_main_t * vm,
1396                                   vlib_node_runtime_t * node,
1397                                   vlib_frame_t * frame, bool is_feature)
1398 {
1399   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1400
1401   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1402   u32 n_enq, n_left_from, *from;
1403   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1404   u32 fq_index;
1405
1406   from = vlib_frame_vector_args (frame);
1407   n_left_from = frame->n_vectors;
1408   vlib_get_buffers (vm, from, bufs, n_left_from);
1409
1410   b = bufs;
1411   ti = thread_indices;
1412
1413   fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1414
1415   while (n_left_from > 0)
1416     {
1417       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1418
1419       if (PREDICT_FALSE
1420           ((node->flags & VLIB_NODE_FLAG_TRACE)
1421            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1422         {
1423           ip4_sv_reass_handoff_trace_t *t =
1424             vlib_add_trace (vm, node, b[0], sizeof (*t));
1425           t->next_worker_index = ti[0];
1426         }
1427
1428       n_left_from -= 1;
1429       ti += 1;
1430       b += 1;
1431     }
1432   n_enq =
1433     vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1434                                    frame->n_vectors, 1);
1435
1436   if (n_enq < frame->n_vectors)
1437     vlib_node_increment_counter (vm, node->node_index,
1438                                  IP4_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1439                                  frame->n_vectors - n_enq);
1440   return frame->n_vectors;
1441 }
1442
1443 VLIB_NODE_FN (ip4_sv_reass_handoff_node) (vlib_main_t * vm,
1444                                           vlib_node_runtime_t * node,
1445                                           vlib_frame_t * frame)
1446 {
1447   return ip4_sv_reass_handoff_node_inline (vm, node, frame,
1448                                            false /* is_feature */ );
1449 }
1450
1451
1452 /* *INDENT-OFF* */
1453 VLIB_REGISTER_NODE (ip4_sv_reass_handoff_node) = {
1454   .name = "ip4-sv-reassembly-handoff",
1455   .vector_size = sizeof (u32),
1456   .n_errors = ARRAY_LEN(ip4_sv_reass_handoff_error_strings),
1457   .error_strings = ip4_sv_reass_handoff_error_strings,
1458   .format_trace = format_ip4_sv_reass_handoff_trace,
1459
1460   .n_next_nodes = 1,
1461
1462   .next_nodes = {
1463     [0] = "error-drop",
1464   },
1465 };
1466 /* *INDENT-ON* */
1467
1468
1469 /* *INDENT-OFF* */
1470 VLIB_NODE_FN (ip4_sv_reass_feature_handoff_node) (vlib_main_t * vm,
1471                                                     vlib_node_runtime_t *
1472                                                     node,
1473                                                     vlib_frame_t * frame)
1474 {
1475   return ip4_sv_reass_handoff_node_inline (vm, node, frame,
1476                                              true /* is_feature */ );
1477 }
1478 /* *INDENT-ON* */
1479
1480
1481 /* *INDENT-OFF* */
1482 VLIB_REGISTER_NODE (ip4_sv_reass_feature_handoff_node) = {
1483   .name = "ip4-sv-reass-feature-hoff",
1484   .vector_size = sizeof (u32),
1485   .n_errors = ARRAY_LEN(ip4_sv_reass_handoff_error_strings),
1486   .error_strings = ip4_sv_reass_handoff_error_strings,
1487   .format_trace = format_ip4_sv_reass_handoff_trace,
1488
1489   .n_next_nodes = 1,
1490
1491   .next_nodes = {
1492     [0] = "error-drop",
1493   },
1494 };
1495 /* *INDENT-ON* */
1496
1497 #ifndef CLIB_MARCH_VARIANT
1498 int
1499 ip4_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1500 {
1501   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1502   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1503   if (is_enable)
1504     {
1505       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1506         {
1507           ++rm->feature_use_refcount_per_intf[sw_if_index];
1508           return vnet_feature_enable_disable ("ip4-unicast",
1509                                               "ip4-sv-reassembly-feature",
1510                                               sw_if_index, 1, 0, 0);
1511         }
1512       ++rm->feature_use_refcount_per_intf[sw_if_index];
1513     }
1514   else
1515     {
1516       if (rm->feature_use_refcount_per_intf[sw_if_index])
1517         --rm->feature_use_refcount_per_intf[sw_if_index];
1518       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1519         return vnet_feature_enable_disable ("ip4-unicast",
1520                                             "ip4-sv-reassembly-feature",
1521                                             sw_if_index, 0, 0, 0);
1522     }
1523   return 0;
1524 }
1525
1526 uword
1527 ip4_sv_reass_custom_register_next_node (uword node_index)
1528 {
1529   return vlib_node_add_next (vlib_get_main (), ip4_sv_reass_custom_node.index,
1530                              node_index);
1531 }
1532
1533 int
1534 ip4_sv_reass_output_enable_disable_with_refcnt (u32 sw_if_index,
1535                                                 int is_enable)
1536 {
1537   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1538   vec_validate (rm->output_feature_use_refcount_per_intf, sw_if_index);
1539   if (is_enable)
1540     {
1541       if (!rm->output_feature_use_refcount_per_intf[sw_if_index])
1542         {
1543           ++rm->output_feature_use_refcount_per_intf[sw_if_index];
1544           return vnet_feature_enable_disable ("ip4-output",
1545                                               "ip4-sv-reassembly-output-feature",
1546                                               sw_if_index, 1, 0, 0);
1547         }
1548       ++rm->output_feature_use_refcount_per_intf[sw_if_index];
1549     }
1550   else
1551     {
1552       if (rm->output_feature_use_refcount_per_intf[sw_if_index])
1553         --rm->output_feature_use_refcount_per_intf[sw_if_index];
1554       if (!rm->output_feature_use_refcount_per_intf[sw_if_index])
1555         return vnet_feature_enable_disable ("ip4-output",
1556                                             "ip4-sv-reassembly-output-feature",
1557                                             sw_if_index, 0, 0, 0);
1558     }
1559   return 0;
1560 }
1561 #endif
1562
1563 /*
1564  * fd.io coding-style-patch-verification: ON
1565  *
1566  * Local Variables:
1567  * eval: (c-set-style "gnu")
1568  * End:
1569  */