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   if (pool_is_free_index
 239       (vm->trace_main.trace_buffer_pool, vlib_buffer_get_trace_index (b)))
 240     {
 241       // this buffer's trace is gone
 242       b->flags &= ~VLIB_BUFFER_IS_TRACED;
 243       return;
 244     }
 245   ip4_sv_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 246   if (reass)
 247     {
 248       t->reass_id = reass->id;
 249       t->op_id = reass->trace_op_counter;
 250       ++reass->trace_op_counter;
 251     }
 252   t->action = action;
 253   t->ip_proto = ip_proto;
 254   t->l4_src_port = l4_src_port;
 255   t->l4_dst_port = l4_dst_port;
 256 #if 0
 257   static u8 *s = NULL;
 258   s = format (s, "%U", format_ip4_sv_reass_trace, NULL, NULL, t);
 259   printf ("%.*s\n", vec_len (s), s);
 260   fflush (stdout);
 261   vec_reset_length (s);
 262 #endif
 263 }
 264
 265
 266 always_inline void
 267 ip4_sv_reass_free (vlib_main_t * vm, ip4_sv_reass_main_t * rm,
 268                    ip4_sv_reass_per_thread_t * rt, ip4_sv_reass_t * reass)
 269 {
 270   clib_bihash_kv_16_8_t kv;
 271   kv.key[0] = reass->key.as_u64[0];
 272   kv.key[1] = reass->key.as_u64[1];
 273   clib_bihash_add_del_16_8 (&rm->hash, &kv, 0);
 274   vlib_buffer_free (vm, reass->cached_buffers,
 275                     vec_len (reass->cached_buffers));
 276   vec_free (reass->cached_buffers);
 277   reass->cached_buffers = NULL;
 278   if (~0 != reass->lru_prev)
 279     {
 280       ip4_sv_reass_t *lru_prev =
 281         pool_elt_at_index (rt->pool, reass->lru_prev);
 282       lru_prev->lru_next = reass->lru_next;
 283     }
 284   if (~0 != reass->lru_next)
 285     {
 286       ip4_sv_reass_t *lru_next =
 287         pool_elt_at_index (rt->pool, reass->lru_next);
 288       lru_next->lru_prev = reass->lru_prev;
 289     }
 290   if (rt->lru_first == reass - rt->pool)
 291     {
 292       rt->lru_first = reass->lru_next;
 293     }
 294   if (rt->lru_last == reass - rt->pool)
 295     {
 296       rt->lru_last = reass->lru_prev;
 297     }
 298   pool_put (rt->pool, reass);
 299   --rt->reass_n;
 300 }
 301
 302 always_inline void
 303 ip4_sv_reass_init (ip4_sv_reass_t * reass)
 304 {
 305   reass->cached_buffers = NULL;
 306   reass->is_complete = false;
 307 }
 308
 309 always_inline ip4_sv_reass_t *
 310 ip4_sv_reass_find_or_create (vlib_main_t * vm, ip4_sv_reass_main_t * rm,
 311                              ip4_sv_reass_per_thread_t * rt,
 312                              ip4_sv_reass_kv_t * kv, u8 * do_handoff)
 313 {
 314   ip4_sv_reass_t *reass = NULL;
 315   f64 now = vlib_time_now (vm);
 316
 317   if (!clib_bihash_search_16_8 (&rm->hash, &kv->kv, &kv->kv))
 318     {
 319       if (vm->thread_index != kv->v.thread_index)
 320         {
 321           *do_handoff = 1;
 322           return NULL;
 323         }
 324       reass = pool_elt_at_index (rt->pool, kv->v.reass_index);
 325
 326       if (now > reass->last_heard + rm->timeout)
 327         {
 328           ip4_sv_reass_free (vm, rm, rt, reass);
 329           reass = NULL;
 330         }
 331     }
 332
 333   if (reass)
 334     {
 335       reass->last_heard = now;
 336       return reass;
 337     }
 338
 339   if (rt->reass_n >= rm->max_reass_n && rm->max_reass_n)
 340     {
 341       reass = pool_elt_at_index (rt->pool, rt->lru_first);
 342       ip4_sv_reass_free (vm, rm, rt, reass);
 343     }
 344
 345   pool_get (rt->pool, reass);
 346   clib_memset (reass, 0, sizeof (*reass));
 347   reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 348   ++rt->id_counter;
 349   ip4_sv_reass_init (reass);
 350   ++rt->reass_n;
 351   reass->lru_prev = reass->lru_next = ~0;
 352
 353   if (~0 != rt->lru_last)
 354     {
 355       ip4_sv_reass_t *lru_last = pool_elt_at_index (rt->pool, rt->lru_last);
 356       reass->lru_prev = rt->lru_last;
 357       lru_last->lru_next = rt->lru_last = reass - rt->pool;
 358     }
 359
 360   if (~0 == rt->lru_first)
 361     {
 362       rt->lru_first = rt->lru_last = reass - rt->pool;
 363     }
 364
 365   reass->key.as_u64[0] = kv->kv.key[0];
 366   reass->key.as_u64[1] = kv->kv.key[1];
 367   kv->v.reass_index = (reass - rt->pool);
 368   kv->v.thread_index = vm->thread_index;
 369   reass->last_heard = now;
 370
 371   if (clib_bihash_add_del_16_8 (&rm->hash, &kv->kv, 1))
 372     {
 373       ip4_sv_reass_free (vm, rm, rt, reass);
 374       reass = NULL;
 375     }
 376
 377   return reass;
 378 }
 379
 380 always_inline ip4_sv_reass_rc_t
 381 ip4_sv_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 382                      ip4_sv_reass_main_t * rm, ip4_sv_reass_per_thread_t * rt,
 383                      ip4_header_t * ip0, ip4_sv_reass_t * reass, u32 bi0)
 384 {
 385   vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
 386   ip4_sv_reass_rc_t rc = IP4_SV_REASS_RC_OK;
 387   const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
 388   if (0 == fragment_first)
 389     {
 390       reass->ip_proto = ip0->protocol;
 391       reass->l4_src_port = ip4_get_port (ip0, 1);
 392       reass->l4_dst_port = ip4_get_port (ip0, 0);
 393       if (!reass->l4_src_port || !reass->l4_dst_port)
 394         return IP4_SV_REASS_RC_UNSUPP_IP_PROTO;
 395       if (IP_PROTOCOL_TCP == reass->ip_proto)
 396         {
 397           reass->icmp_type_or_tcp_flags = ((tcp_header_t *) (ip0 + 1))->flags;
 398           reass->tcp_ack_number = ((tcp_header_t *) (ip0 + 1))->ack_number;
 399           reass->tcp_seq_number = ((tcp_header_t *) (ip0 + 1))->seq_number;
 400         }
 401       else if (IP_PROTOCOL_ICMP == reass->ip_proto)
 402         {
 403           reass->icmp_type_or_tcp_flags =
 404             ((icmp46_header_t *) (ip0 + 1))->type;
 405         }
 406       reass->is_complete = true;
 407       vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
 408       if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 409         {
 410           ip4_sv_reass_add_trace (vm, node, rm, reass, bi0, REASS_FINISH,
 411                                   reass->ip_proto, reass->l4_src_port,
 412                                   reass->l4_dst_port);
 413         }
 414     }
 415   vec_add1 (reass->cached_buffers, bi0);
 416   if (!reass->is_complete)
 417     {
 418       if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 419         {
 420           ip4_sv_reass_add_trace (vm, node, rm, reass, bi0,
 421                                   REASS_FRAGMENT_CACHE, ~0, ~0, ~0);
 422         }
 423       if (vec_len (reass->cached_buffers) > rm->max_reass_len)
 424         {
 425           rc = IP4_SV_REASS_RC_TOO_MANY_FRAGMENTS;
 426         }
 427     }
 428   return rc;
 429 }
 430
 431 always_inline uword
 432 ip4_sv_reass_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 433                      vlib_frame_t * frame, bool is_feature,
 434                      bool is_output_feature, bool is_custom)
 435 {
 436   u32 *from = vlib_frame_vector_args (frame);
 437   u32 n_left_from, n_left_to_next, *to_next, next_index;
 438   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
 439   ip4_sv_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
 440   clib_spinlock_lock (&rt->lock);
 441
 442   n_left_from = frame->n_vectors;
 443   next_index = node->cached_next_index;
 444
 445   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
 446   vlib_get_buffers (vm, from, bufs, n_left_from);
 447   u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
 448   b = bufs;
 449
 450   /* optimistic case first - no fragments */
 451   while (n_left_from >= 2)
 452     {
 453       vlib_buffer_t *b0, *b1;
 454       u32 next0, next1;
 455       b0 = *b;
 456       b++;
 457       b1 = *b;
 458       b++;
 459
 460       /* Prefetch next iteration. */
 461       if (PREDICT_TRUE (n_left_from >= 4))
 462         {
 463           vlib_buffer_t *p2, *p3;
 464
 465           p2 = *b;
 466           p3 = *(b + 1);
 467
 468           vlib_prefetch_buffer_header (p2, LOAD);
 469           vlib_prefetch_buffer_header (p3, LOAD);
 470
 471           clib_prefetch_load (p2->data);
 472           clib_prefetch_load (p3->data);
 473         }
 474
 475       ip4_header_t *ip0 =
 476         (ip4_header_t *) u8_ptr_add (vlib_buffer_get_current (b0),
 477                                      (is_output_feature ? 1 : 0) *
 478                                      vnet_buffer (b0)->
 479                                      ip.save_rewrite_length);
 480       ip4_header_t *ip1 =
 481         (ip4_header_t *) u8_ptr_add (vlib_buffer_get_current (b1),
 482                                      (is_output_feature ? 1 : 0) *
 483                                      vnet_buffer (b1)->
 484                                      ip.save_rewrite_length);
 485       if (PREDICT_FALSE
 486           (ip4_get_fragment_more (ip0) || ip4_get_fragment_offset (ip0))
 487           || (ip4_get_fragment_more (ip1) || ip4_get_fragment_offset (ip1)))
 488         {
 489           // fragment found, go slow path
 490           b -= 2;
 491           if (b - bufs > 0)
 492             {
 493               vlib_buffer_enqueue_to_next (vm, node, from, (u16 *) nexts,
 494                                            b - bufs);
 495             }
 496           goto slow_path;
 497         }
 498       if (is_feature)
 499         {
 500           vnet_feature_next (&next0, b0);
 501         }
 502       else
 503         {
 504           next0 = is_custom ? vnet_buffer (b0)->ip.reass.next_index :
 505             IP4_SV_REASSEMBLY_NEXT_INPUT;
 506         }
 507       vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
 508       vnet_buffer (b0)->ip.reass.ip_proto = ip0->protocol;
 509       if (IP_PROTOCOL_TCP == ip0->protocol)
 510         {
 511           vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 512             ((tcp_header_t *) (ip0 + 1))->flags;
 513           vnet_buffer (b0)->ip.reass.tcp_ack_number =
 514             ((tcp_header_t *) (ip0 + 1))->ack_number;
 515           vnet_buffer (b0)->ip.reass.tcp_seq_number =
 516             ((tcp_header_t *) (ip0 + 1))->seq_number;
 517         }
 518       else if (IP_PROTOCOL_ICMP == ip0->protocol)
 519         {
 520           vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 521             ((icmp46_header_t *) (ip0 + 1))->type;
 522         }
 523       vnet_buffer (b0)->ip.reass.l4_src_port = ip4_get_port (ip0, 1);
 524       vnet_buffer (b0)->ip.reass.l4_dst_port = ip4_get_port (ip0, 0);
 525       if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 526         {
 527           ip4_sv_reass_add_trace (vm, node, rm, NULL, from[(b - 2) - bufs],
 528                                   REASS_PASSTHROUGH,
 529                                   vnet_buffer (b0)->ip.reass.ip_proto,
 530                                   vnet_buffer (b0)->ip.reass.l4_src_port,
 531                                   vnet_buffer (b0)->ip.reass.l4_dst_port);
 532         }
 533       if (is_feature)
 534         {
 535           vnet_feature_next (&next1, b1);
 536         }
 537       else
 538         {
 539           next1 = is_custom ? vnet_buffer (b1)->ip.reass.next_index :
 540             IP4_SV_REASSEMBLY_NEXT_INPUT;
 541         }
 542       vnet_buffer (b1)->ip.reass.is_non_first_fragment = 0;
 543       vnet_buffer (b1)->ip.reass.ip_proto = ip1->protocol;
 544       if (IP_PROTOCOL_TCP == ip1->protocol)
 545         {
 546           vnet_buffer (b1)->ip.reass.icmp_type_or_tcp_flags =
 547             ((tcp_header_t *) (ip1 + 1))->flags;
 548           vnet_buffer (b1)->ip.reass.tcp_ack_number =
 549             ((tcp_header_t *) (ip1 + 1))->ack_number;
 550           vnet_buffer (b1)->ip.reass.tcp_seq_number =
 551             ((tcp_header_t *) (ip1 + 1))->seq_number;
 552         }
 553       else if (IP_PROTOCOL_ICMP == ip1->protocol)
 554         {
 555           vnet_buffer (b1)->ip.reass.icmp_type_or_tcp_flags =
 556             ((icmp46_header_t *) (ip1 + 1))->type;
 557         }
 558       vnet_buffer (b1)->ip.reass.l4_src_port = ip4_get_port (ip1, 1);
 559       vnet_buffer (b1)->ip.reass.l4_dst_port = ip4_get_port (ip1, 0);
 560       if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
 561         {
 562           ip4_sv_reass_add_trace (vm, node, rm, NULL, from[(b - 1) - bufs],
 563                                   REASS_PASSTHROUGH,
 564                                   vnet_buffer (b1)->ip.reass.ip_proto,
 565                                   vnet_buffer (b1)->ip.reass.l4_src_port,
 566                                   vnet_buffer (b1)->ip.reass.l4_dst_port);
 567         }
 568
 569       n_left_from -= 2;
 570       next[0] = next0;
 571       next[1] = next1;
 572       next += 2;
 573     }
 574
 575   while (n_left_from > 0)
 576     {
 577       vlib_buffer_t *b0;
 578       u32 next0;
 579       b0 = *b;
 580       b++;
 581
 582       ip4_header_t *ip0 =
 583         (ip4_header_t *) u8_ptr_add (vlib_buffer_get_current (b0),
 584                                      (is_output_feature ? 1 : 0) *
 585                                      vnet_buffer (b0)->
 586                                      ip.save_rewrite_length);
 587       if (PREDICT_FALSE
 588           (ip4_get_fragment_more (ip0) || ip4_get_fragment_offset (ip0)))
 589         {
 590           // fragment found, go slow path
 591           b -= 1;
 592           if (b - bufs > 0)
 593             {
 594               vlib_buffer_enqueue_to_next (vm, node, from, (u16 *) nexts,
 595                                            b - bufs);
 596             }
 597           goto slow_path;
 598         }
 599       if (is_feature)
 600         {
 601           vnet_feature_next (&next0, b0);
 602         }
 603       else
 604         {
 605           next0 =
 606             is_custom ? vnet_buffer (b0)->ip.
 607             reass.next_index : IP4_SV_REASSEMBLY_NEXT_INPUT;
 608         }
 609       vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
 610       vnet_buffer (b0)->ip.reass.ip_proto = ip0->protocol;
 611       if (IP_PROTOCOL_TCP == ip0->protocol)
 612         {
 613           vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 614             ((tcp_header_t *) (ip0 + 1))->flags;
 615           vnet_buffer (b0)->ip.reass.tcp_ack_number =
 616             ((tcp_header_t *) (ip0 + 1))->ack_number;
 617           vnet_buffer (b0)->ip.reass.tcp_seq_number =
 618             ((tcp_header_t *) (ip0 + 1))->seq_number;
 619         }
 620       else if (IP_PROTOCOL_ICMP == ip0->protocol)
 621         {
 622           vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 623             ((icmp46_header_t *) (ip0 + 1))->type;
 624         }
 625       vnet_buffer (b0)->ip.reass.l4_src_port = ip4_get_port (ip0, 1);
 626       vnet_buffer (b0)->ip.reass.l4_dst_port = ip4_get_port (ip0, 0);
 627       if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 628         {
 629           ip4_sv_reass_add_trace (vm, node, rm, NULL, from[(b - 1) - bufs],
 630                                   REASS_PASSTHROUGH,
 631                                   vnet_buffer (b0)->ip.reass.ip_proto,
 632                                   vnet_buffer (b0)->ip.reass.l4_src_port,
 633                                   vnet_buffer (b0)->ip.reass.l4_dst_port);
 634         }
 635
 636       n_left_from -= 1;
 637       next[0] = next0;
 638       next += 1;
 639     }
 640
 641   vlib_buffer_enqueue_to_next (vm, node, from, (u16 *) nexts,
 642                                frame->n_vectors);
 643
 644   goto done;
 645
 646 slow_path:
 647
 648   from += b - bufs;
 649
 650   while (n_left_from > 0)
 651     {
 652       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 653
 654       while (n_left_from > 0 && n_left_to_next > 0)
 655         {
 656           u32 bi0;
 657           vlib_buffer_t *b0;
 658           u32 next0;
 659           u32 error0 = IP4_ERROR_NONE;
 660
 661           bi0 = from[0];
 662           b0 = vlib_get_buffer (vm, bi0);
 663
 664           ip4_header_t *ip0 =
 665             (ip4_header_t *) u8_ptr_add (vlib_buffer_get_current (b0),
 666                                          (is_output_feature ? 1 : 0) *
 667                                          vnet_buffer (b0)->
 668                                          ip.save_rewrite_length);
 669           if (!ip4_get_fragment_more (ip0) && !ip4_get_fragment_offset (ip0))
 670             {
 671               // this is a regular packet - no fragmentation
 672               if (is_custom)
 673                 {
 674                   next0 = vnet_buffer (b0)->ip.reass.next_index;
 675                 }
 676               else
 677                 {
 678                   next0 = IP4_SV_REASSEMBLY_NEXT_INPUT;
 679                 }
 680               vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
 681               vnet_buffer (b0)->ip.reass.ip_proto = ip0->protocol;
 682               if (IP_PROTOCOL_TCP == ip0->protocol)
 683                 {
 684                   vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 685                     ((tcp_header_t *) (ip0 + 1))->flags;
 686                   vnet_buffer (b0)->ip.reass.tcp_ack_number =
 687                     ((tcp_header_t *) (ip0 + 1))->ack_number;
 688                   vnet_buffer (b0)->ip.reass.tcp_seq_number =
 689                     ((tcp_header_t *) (ip0 + 1))->seq_number;
 690                 }
 691               else if (IP_PROTOCOL_ICMP == ip0->protocol)
 692                 {
 693                   vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 694                     ((icmp46_header_t *) (ip0 + 1))->type;
 695                 }
 696               vnet_buffer (b0)->ip.reass.l4_src_port = ip4_get_port (ip0, 1);
 697               vnet_buffer (b0)->ip.reass.l4_dst_port = ip4_get_port (ip0, 0);
 698               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 699                 {
 700                   ip4_sv_reass_add_trace (vm, node, rm, NULL, bi0,
 701                                           REASS_PASSTHROUGH,
 702                                           vnet_buffer (b0)->ip.reass.ip_proto,
 703                                           vnet_buffer (b0)->ip.
 704                                           reass.l4_src_port,
 705                                           vnet_buffer (b0)->ip.
 706                                           reass.l4_dst_port);
 707                 }
 708               goto packet_enqueue;
 709             }
 710           const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
 711           const u32 fragment_length =
 712             clib_net_to_host_u16 (ip0->length) - ip4_header_bytes (ip0);
 713           const u32 fragment_last = fragment_first + fragment_length - 1;
 714           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
 715             {
 716               next0 = IP4_SV_REASSEMBLY_NEXT_DROP;
 717               error0 = IP4_ERROR_REASS_MALFORMED_PACKET;
 718               b0->error = node->errors[error0];
 719               goto packet_enqueue;
 720             }
 721           ip4_sv_reass_kv_t kv;
 722           u8 do_handoff = 0;
 723
 724           kv.k.as_u64[0] =
 725             (u64) vec_elt (ip4_main.fib_index_by_sw_if_index,
 726                            vnet_buffer (b0)->sw_if_index[VLIB_RX]) |
 727             (u64) ip0->src_address.as_u32 << 32;
 728           kv.k.as_u64[1] =
 729             (u64) ip0->dst_address.
 730             as_u32 | (u64) ip0->fragment_id << 32 | (u64) ip0->protocol << 48;
 731
 732           ip4_sv_reass_t *reass =
 733             ip4_sv_reass_find_or_create (vm, rm, rt, &kv, &do_handoff);
 734
 735           if (PREDICT_FALSE (do_handoff))
 736             {
 737               next0 = IP4_SV_REASSEMBLY_NEXT_HANDOFF;
 738               vnet_buffer (b0)->ip.reass.owner_thread_index =
 739                 kv.v.thread_index;
 740               goto packet_enqueue;
 741             }
 742
 743           if (!reass)
 744             {
 745               next0 = IP4_SV_REASSEMBLY_NEXT_DROP;
 746               error0 = IP4_ERROR_REASS_LIMIT_REACHED;
 747               b0->error = node->errors[error0];
 748               goto packet_enqueue;
 749             }
 750
 751           if (reass->is_complete)
 752             {
 753               if (is_custom)
 754                 {
 755                   next0 = vnet_buffer (b0)->ip.reass.next_index;
 756                 }
 757               else
 758                 {
 759                   next0 = IP4_SV_REASSEMBLY_NEXT_INPUT;
 760                 }
 761               vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 762                 ! !fragment_first;
 763               vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 764               vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 765                 reass->icmp_type_or_tcp_flags;
 766               vnet_buffer (b0)->ip.reass.tcp_ack_number =
 767                 reass->tcp_ack_number;
 768               vnet_buffer (b0)->ip.reass.tcp_seq_number =
 769                 reass->tcp_seq_number;
 770               vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 771               vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 772               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 773                 {
 774                   ip4_sv_reass_add_trace (vm, node, rm, reass, bi0,
 775                                           REASS_FRAGMENT_FORWARD,
 776                                           reass->ip_proto,
 777                                           reass->l4_src_port,
 778                                           reass->l4_dst_port);
 779                 }
 780               goto packet_enqueue;
 781             }
 782
 783           ip4_sv_reass_rc_t rc =
 784             ip4_sv_reass_update (vm, node, rm, rt, ip0, reass, bi0);
 785           switch (rc)
 786             {
 787             case IP4_SV_REASS_RC_OK:
 788               /* nothing to do here */
 789               break;
 790             case IP4_SV_REASS_RC_TOO_MANY_FRAGMENTS:
 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             case IP4_SV_REASS_RC_UNSUPP_IP_PROTO:
 798               vlib_node_increment_counter (vm, node->node_index,
 799                                            IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
 800                                            1);
 801               ip4_sv_reass_free (vm, rm, rt, reass);
 802               goto next_packet;
 803               break;
 804             }
 805           if (reass->is_complete)
 806             {
 807               u32 idx;
 808               vec_foreach_index (idx, reass->cached_buffers)
 809               {
 810                 u32 bi0 = vec_elt (reass->cached_buffers, idx);
 811                 vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
 812                 ip0 =
 813                   (ip4_header_t *) u8_ptr_add (vlib_buffer_get_current (b0),
 814                                                (is_output_feature ? 1 : 0) *
 815                                                vnet_buffer (b0)->
 816                                                ip.save_rewrite_length);
 817                 u32 next0 = IP4_SV_REASSEMBLY_NEXT_INPUT;
 818                 if (is_feature)
 819                   {
 820                     vnet_feature_next (&next0, b0);
 821                   }
 822                 if (is_custom)
 823                   {
 824                     next0 = vnet_buffer (b0)->ip.reass.next_index;
 825                   }
 826                 if (0 == n_left_to_next)
 827                   {
 828                     vlib_put_next_frame (vm, node, next_index,
 829                                          n_left_to_next);
 830                     vlib_get_next_frame (vm, node, next_index, to_next,
 831                                          n_left_to_next);
 832                   }
 833                 to_next[0] = bi0;
 834                 to_next += 1;
 835                 n_left_to_next -= 1;
 836                 vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 837                   ! !ip4_get_fragment_offset (ip0);
 838                 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 839                 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 840                   reass->icmp_type_or_tcp_flags;
 841                 vnet_buffer (b0)->ip.reass.tcp_ack_number =
 842                   reass->tcp_ack_number;
 843                 vnet_buffer (b0)->ip.reass.tcp_seq_number =
 844                   reass->tcp_seq_number;
 845                 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 846                 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 847                 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 848                   {
 849                     ip4_sv_reass_add_trace (vm, node, rm, reass, bi0,
 850                                             REASS_FRAGMENT_FORWARD,
 851                                             reass->ip_proto,
 852                                             reass->l4_src_port,
 853                                             reass->l4_dst_port);
 854                   }
 855                 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 856                                                  to_next, n_left_to_next, bi0,
 857                                                  next0);
 858               }
 859               _vec_len (reass->cached_buffers) = 0;     // buffers are owned by frame now
 860             }
 861           goto next_packet;
 862
 863         packet_enqueue:
 864           to_next[0] = bi0;
 865           to_next += 1;
 866           n_left_to_next -= 1;
 867           if (is_feature && IP4_ERROR_NONE == error0)
 868             {
 869               b0 = vlib_get_buffer (vm, bi0);
 870               vnet_feature_next (&next0, b0);
 871             }
 872           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 873                                            to_next, n_left_to_next,
 874                                            bi0, next0);
 875
 876         next_packet:
 877           from += 1;
 878           n_left_from -= 1;
 879         }
 880
 881       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 882     }
 883
 884 done:
 885   clib_spinlock_unlock (&rt->lock);
 886   return frame->n_vectors;
 887 }
 888
 889 static char *ip4_sv_reass_error_strings[] = {
 890 #define _(sym, string) string,
 891   foreach_ip4_error
 892 #undef _
 893 };
 894
 895 VLIB_NODE_FN (ip4_sv_reass_node) (vlib_main_t * vm,
 896                                   vlib_node_runtime_t * node,
 897                                   vlib_frame_t * frame)
 898 {
 899   return ip4_sv_reass_inline (vm, node, frame, false /* is_feature */ ,
 900                               false /* is_output_feature */ ,
 901                               false /* is_custom */ );
 902 }
 903
 904 /* *INDENT-OFF* */
 905 VLIB_REGISTER_NODE (ip4_sv_reass_node) = {
 906     .name = "ip4-sv-reassembly",
 907     .vector_size = sizeof (u32),
 908     .format_trace = format_ip4_sv_reass_trace,
 909     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
 910     .error_strings = ip4_sv_reass_error_strings,
 911     .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
 912     .next_nodes =
 913         {
 914                 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
 915                 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
 916                 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reassembly-handoff",
 917
 918         },
 919 };
 920 /* *INDENT-ON* */
 921
 922 VLIB_NODE_FN (ip4_sv_reass_node_feature) (vlib_main_t * vm,
 923                                           vlib_node_runtime_t * node,
 924                                           vlib_frame_t * frame)
 925 {
 926   return ip4_sv_reass_inline (vm, node, frame, true /* is_feature */ ,
 927                               false /* is_output_feature */ ,
 928                               false /* is_custom */ );
 929 }
 930
 931 /* *INDENT-OFF* */
 932 VLIB_REGISTER_NODE (ip4_sv_reass_node_feature) = {
 933     .name = "ip4-sv-reassembly-feature",
 934     .vector_size = sizeof (u32),
 935     .format_trace = format_ip4_sv_reass_trace,
 936     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
 937     .error_strings = ip4_sv_reass_error_strings,
 938     .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
 939     .next_nodes =
 940         {
 941                 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
 942                 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
 943                 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reass-feature-hoff",
 944         },
 945 };
 946 /* *INDENT-ON* */
 947
 948 /* *INDENT-OFF* */
 949 VNET_FEATURE_INIT (ip4_sv_reass_feature) = {
 950     .arc_name = "ip4-unicast",
 951     .node_name = "ip4-sv-reassembly-feature",
 952     .runs_before = VNET_FEATURES ("ip4-lookup"),
 953     .runs_after = 0,
 954 };
 955 /* *INDENT-ON* */
 956
 957 VLIB_NODE_FN (ip4_sv_reass_node_output_feature) (vlib_main_t * vm,
 958                                                  vlib_node_runtime_t * node,
 959                                                  vlib_frame_t * frame)
 960 {
 961   return ip4_sv_reass_inline (vm, node, frame, true /* is_feature */ ,
 962                               true /* is_output_feature */ ,
 963                               false /* is_custom */ );
 964 }
 965
 966
 967 /* *INDENT-OFF* */
 968 VLIB_REGISTER_NODE (ip4_sv_reass_node_output_feature) = {
 969     .name = "ip4-sv-reassembly-output-feature",
 970     .vector_size = sizeof (u32),
 971     .format_trace = format_ip4_sv_reass_trace,
 972     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
 973     .error_strings = ip4_sv_reass_error_strings,
 974     .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
 975     .next_nodes =
 976         {
 977                 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
 978                 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
 979                 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reass-feature-hoff",
 980         },
 981 };
 982 /* *INDENT-ON* */
 983
 984 /* *INDENT-OFF* */
 985 VNET_FEATURE_INIT (ip4_sv_reass_output_feature) = {
 986     .arc_name = "ip4-output",
 987     .node_name = "ip4-sv-reassembly-output-feature",
 988     .runs_before = 0,
 989     .runs_after = 0,
 990 };
 991 /* *INDENT-ON* */
 992
 993 /* *INDENT-OFF* */
 994 VLIB_REGISTER_NODE (ip4_sv_reass_custom_node) = {
 995     .name = "ip4-sv-reassembly-custom-next",
 996     .vector_size = sizeof (u32),
 997     .format_trace = format_ip4_sv_reass_trace,
 998     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
 999     .error_strings = ip4_sv_reass_error_strings,
1000     .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
1001     .next_nodes =
1002         {
1003                 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
1004                 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
1005                 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reassembly-handoff",
1006
1007         },
1008 };
1009 /* *INDENT-ON* */
1010
1011 VLIB_NODE_FN (ip4_sv_reass_custom_node) (vlib_main_t * vm,
1012                                          vlib_node_runtime_t * node,
1013                                          vlib_frame_t * frame)
1014 {
1015   return ip4_sv_reass_inline (vm, node, frame, false /* is_feature */ ,
1016                               false /* is_output_feature */ ,
1017                               true /* is_custom */ );
1018 }
1019
1020 #ifndef CLIB_MARCH_VARIANT
1021 always_inline u32
1022 ip4_sv_reass_get_nbuckets ()
1023 {
1024   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1025   u32 nbuckets;
1026   u8 i;
1027
1028   nbuckets = (u32) (rm->max_reass_n / IP4_SV_REASS_HT_LOAD_FACTOR);
1029
1030   for (i = 0; i < 31; i++)
1031     if ((1 << i) >= nbuckets)
1032       break;
1033   nbuckets = 1 << i;
1034
1035   return nbuckets;
1036 }
1037 #endif /* CLIB_MARCH_VARIANT */
1038
1039 typedef enum
1040 {
1041   IP4_EVENT_CONFIG_CHANGED = 1,
1042 } ip4_sv_reass_event_t;
1043
1044 typedef struct
1045 {
1046   int failure;
1047   clib_bihash_16_8_t *new_hash;
1048 } ip4_rehash_cb_ctx;
1049
1050 #ifndef CLIB_MARCH_VARIANT
1051 static int
1052 ip4_rehash_cb (clib_bihash_kv_16_8_t * kv, void *_ctx)
1053 {
1054   ip4_rehash_cb_ctx *ctx = _ctx;
1055   if (clib_bihash_add_del_16_8 (ctx->new_hash, kv, 1))
1056     {
1057       ctx->failure = 1;
1058     }
1059   return (BIHASH_WALK_CONTINUE);
1060 }
1061
1062 static void
1063 ip4_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1064                          u32 max_reassembly_length,
1065                          u32 expire_walk_interval_ms)
1066 {
1067   ip4_sv_reass_main.timeout_ms = timeout_ms;
1068   ip4_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1069   ip4_sv_reass_main.max_reass_n = max_reassemblies;
1070   ip4_sv_reass_main.max_reass_len = max_reassembly_length;
1071   ip4_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1072 }
1073
1074 vnet_api_error_t
1075 ip4_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
1076                   u32 max_reassembly_length, u32 expire_walk_interval_ms)
1077 {
1078   u32 old_nbuckets = ip4_sv_reass_get_nbuckets ();
1079   ip4_sv_reass_set_params (timeout_ms, max_reassemblies,
1080                            max_reassembly_length, expire_walk_interval_ms);
1081   vlib_process_signal_event (ip4_sv_reass_main.vlib_main,
1082                              ip4_sv_reass_main.ip4_sv_reass_expire_node_idx,
1083                              IP4_EVENT_CONFIG_CHANGED, 0);
1084   u32 new_nbuckets = ip4_sv_reass_get_nbuckets ();
1085   if (ip4_sv_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1086     {
1087       clib_bihash_16_8_t new_hash;
1088       clib_memset (&new_hash, 0, sizeof (new_hash));
1089       ip4_rehash_cb_ctx ctx;
1090       ctx.failure = 0;
1091       ctx.new_hash = &new_hash;
1092       clib_bihash_init_16_8 (&new_hash, "ip4-dr", new_nbuckets,
1093                              new_nbuckets * 1024);
1094       clib_bihash_foreach_key_value_pair_16_8 (&ip4_sv_reass_main.hash,
1095                                                ip4_rehash_cb, &ctx);
1096       if (ctx.failure)
1097         {
1098           clib_bihash_free_16_8 (&new_hash);
1099           return -1;
1100         }
1101       else
1102         {
1103           clib_bihash_free_16_8 (&ip4_sv_reass_main.hash);
1104           clib_memcpy_fast (&ip4_sv_reass_main.hash, &new_hash,
1105                             sizeof (ip4_sv_reass_main.hash));
1106           clib_bihash_copied (&ip4_sv_reass_main.hash, &new_hash);
1107         }
1108     }
1109   return 0;
1110 }
1111
1112 vnet_api_error_t
1113 ip4_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1114                   u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
1115 {
1116   *timeout_ms = ip4_sv_reass_main.timeout_ms;
1117   *max_reassemblies = ip4_sv_reass_main.max_reass_n;
1118   *max_reassembly_length = ip4_sv_reass_main.max_reass_len;
1119   *expire_walk_interval_ms = ip4_sv_reass_main.expire_walk_interval_ms;
1120   return 0;
1121 }
1122
1123 static clib_error_t *
1124 ip4_sv_reass_init_function (vlib_main_t * vm)
1125 {
1126   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1127   clib_error_t *error = 0;
1128   u32 nbuckets;
1129   vlib_node_t *node;
1130
1131   rm->vlib_main = vm;
1132   rm->vnet_main = vnet_get_main ();
1133
1134   vec_validate (rm->per_thread_data, vlib_num_workers ());
1135   ip4_sv_reass_per_thread_t *rt;
1136   vec_foreach (rt, rm->per_thread_data)
1137   {
1138     clib_spinlock_init (&rt->lock);
1139     pool_alloc (rt->pool, rm->max_reass_n);
1140     rt->lru_first = rt->lru_last = ~0;
1141   }
1142
1143   node = vlib_get_node_by_name (vm, (u8 *) "ip4-sv-reassembly-expire-walk");
1144   ASSERT (node);
1145   rm->ip4_sv_reass_expire_node_idx = node->index;
1146
1147   ip4_sv_reass_set_params (IP4_SV_REASS_TIMEOUT_DEFAULT_MS,
1148                            IP4_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
1149                            IP4_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1150                            IP4_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1151
1152   nbuckets = ip4_sv_reass_get_nbuckets ();
1153   clib_bihash_init_16_8 (&rm->hash, "ip4-dr", nbuckets, nbuckets * 1024);
1154
1155   node = vlib_get_node_by_name (vm, (u8 *) "ip4-drop");
1156   ASSERT (node);
1157   rm->ip4_drop_idx = node->index;
1158
1159   rm->fq_index = vlib_frame_queue_main_init (ip4_sv_reass_node.index, 0);
1160   rm->fq_feature_index =
1161     vlib_frame_queue_main_init (ip4_sv_reass_node_feature.index, 0);
1162
1163   rm->feature_use_refcount_per_intf = NULL;
1164   rm->output_feature_use_refcount_per_intf = NULL;
1165
1166   return error;
1167 }
1168
1169 VLIB_INIT_FUNCTION (ip4_sv_reass_init_function);
1170 #endif /* CLIB_MARCH_VARIANT */
1171
1172 static uword
1173 ip4_sv_reass_walk_expired (vlib_main_t * vm,
1174                            vlib_node_runtime_t * node, vlib_frame_t * f)
1175 {
1176   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1177   uword event_type, *event_data = 0;
1178
1179   while (true)
1180     {
1181       vlib_process_wait_for_event_or_clock (vm,
1182                                             (f64)
1183                                             rm->expire_walk_interval_ms /
1184                                             (f64) MSEC_PER_SEC);
1185       event_type = vlib_process_get_events (vm, &event_data);
1186
1187       switch (event_type)
1188         {
1189         case ~0:                /* no events => timeout */
1190           /* nothing to do here */
1191           break;
1192         case IP4_EVENT_CONFIG_CHANGED:
1193           break;
1194         default:
1195           clib_warning ("BUG: event type 0x%wx", event_type);
1196           break;
1197         }
1198       f64 now = vlib_time_now (vm);
1199
1200       ip4_sv_reass_t *reass;
1201       int *pool_indexes_to_free = NULL;
1202
1203       uword thread_index = 0;
1204       int index;
1205       const uword nthreads = vlib_num_workers () + 1;
1206       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1207         {
1208           ip4_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1209           clib_spinlock_lock (&rt->lock);
1210
1211           vec_reset_length (pool_indexes_to_free);
1212           /* *INDENT-OFF* */
1213           pool_foreach_index (index, rt->pool)  {
1214                                 reass = pool_elt_at_index (rt->pool, index);
1215                                 if (now > reass->last_heard + rm->timeout)
1216                                   {
1217                                     vec_add1 (pool_indexes_to_free, index);
1218                                   }
1219                               }
1220           /* *INDENT-ON* */
1221           int *i;
1222           /* *INDENT-OFF* */
1223           vec_foreach (i, pool_indexes_to_free)
1224           {
1225             ip4_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1226             ip4_sv_reass_free (vm, rm, rt, reass);
1227           }
1228           /* *INDENT-ON* */
1229
1230           clib_spinlock_unlock (&rt->lock);
1231         }
1232
1233       vec_free (pool_indexes_to_free);
1234       if (event_data)
1235         {
1236           _vec_len (event_data) = 0;
1237         }
1238     }
1239
1240   return 0;
1241 }
1242
1243 /* *INDENT-OFF* */
1244 VLIB_REGISTER_NODE (ip4_sv_reass_expire_node) = {
1245     .function = ip4_sv_reass_walk_expired,
1246     .type = VLIB_NODE_TYPE_PROCESS,
1247     .name = "ip4-sv-reassembly-expire-walk",
1248     .format_trace = format_ip4_sv_reass_trace,
1249     .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
1250     .error_strings = ip4_sv_reass_error_strings,
1251
1252 };
1253 /* *INDENT-ON* */
1254
1255 static u8 *
1256 format_ip4_sv_reass_key (u8 * s, va_list * args)
1257 {
1258   ip4_sv_reass_key_t *key = va_arg (*args, ip4_sv_reass_key_t *);
1259   s =
1260     format (s,
1261             "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1262             key->xx_id, format_ip4_address, &key->src, format_ip4_address,
1263             &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1264   return s;
1265 }
1266
1267 static u8 *
1268 format_ip4_sv_reass (u8 * s, va_list * args)
1269 {
1270   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1271   ip4_sv_reass_t *reass = va_arg (*args, ip4_sv_reass_t *);
1272
1273   s = format (s, "ID: %lu, key: %U trace_op_counter: %u\n",
1274               reass->id, format_ip4_sv_reass_key, &reass->key,
1275               reass->trace_op_counter);
1276
1277   vlib_buffer_t *b;
1278   u32 *bip;
1279   u32 counter = 0;
1280   vec_foreach (bip, reass->cached_buffers)
1281   {
1282     u32 bi = *bip;
1283     do
1284       {
1285         b = vlib_get_buffer (vm, bi);
1286         s = format (s, "  #%03u: bi: %u, ", counter, bi);
1287         ++counter;
1288         bi = b->next_buffer;
1289       }
1290     while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1291   }
1292   return s;
1293 }
1294
1295 static clib_error_t *
1296 show_ip4_reass (vlib_main_t * vm,
1297                 unformat_input_t * input,
1298                 CLIB_UNUSED (vlib_cli_command_t * lmd))
1299 {
1300   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1301
1302   vlib_cli_output (vm, "---------------------");
1303   vlib_cli_output (vm, "IP4 reassembly status");
1304   vlib_cli_output (vm, "---------------------");
1305   bool details = false;
1306   if (unformat (input, "details"))
1307     {
1308       details = true;
1309     }
1310
1311   u32 sum_reass_n = 0;
1312   ip4_sv_reass_t *reass;
1313   uword thread_index;
1314   const uword nthreads = vlib_num_workers () + 1;
1315   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1316     {
1317       ip4_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1318       clib_spinlock_lock (&rt->lock);
1319       if (details)
1320         {
1321           /* *INDENT-OFF* */
1322           pool_foreach (reass, rt->pool) {
1323             vlib_cli_output (vm, "%U", format_ip4_sv_reass, vm, reass);
1324           }
1325           /* *INDENT-ON* */
1326         }
1327       sum_reass_n += rt->reass_n;
1328       clib_spinlock_unlock (&rt->lock);
1329     }
1330   vlib_cli_output (vm, "---------------------");
1331   vlib_cli_output (vm, "Current IP4 reassemblies count: %lu\n",
1332                    (long unsigned) sum_reass_n);
1333   vlib_cli_output (vm,
1334                    "Maximum configured concurrent shallow virtual IP4 reassemblies per worker-thread: %lu\n",
1335                    (long unsigned) rm->max_reass_n);
1336   vlib_cli_output (vm,
1337                    "Maximum configured amount of fragments per shallow "
1338                    "virtual IP4 reassembly: %lu\n",
1339                    (long unsigned) rm->max_reass_len);
1340   vlib_cli_output (vm,
1341                    "Maximum configured shallow virtual IP4 reassembly timeout: %lums\n",
1342                    (long unsigned) rm->timeout_ms);
1343   vlib_cli_output (vm,
1344                    "Maximum configured shallow virtual IP4 reassembly expire walk interval: %lums\n",
1345                    (long unsigned) rm->expire_walk_interval_ms);
1346   return 0;
1347 }
1348
1349 /* *INDENT-OFF* */
1350 VLIB_CLI_COMMAND (show_ip4_sv_reass_cmd, static) = {
1351     .path = "show ip4-sv-reassembly",
1352     .short_help = "show ip4-sv-reassembly [details]",
1353     .function = show_ip4_reass,
1354 };
1355 /* *INDENT-ON* */
1356
1357 #ifndef CLIB_MARCH_VARIANT
1358 vnet_api_error_t
1359 ip4_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1360 {
1361   return ip4_sv_reass_enable_disable_with_refcnt (sw_if_index,
1362                                                   enable_disable);
1363 }
1364 #endif /* CLIB_MARCH_VARIANT */
1365
1366
1367 #define foreach_ip4_sv_reass_handoff_error                       \
1368 _(CONGESTION_DROP, "congestion drop")
1369
1370
1371 typedef enum
1372 {
1373 #define _(sym,str) IP4_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
1374   foreach_ip4_sv_reass_handoff_error
1375 #undef _
1376     IP4_SV_REASSEMBLY_HANDOFF_N_ERROR,
1377 } ip4_sv_reass_handoff_error_t;
1378
1379 static char *ip4_sv_reass_handoff_error_strings[] = {
1380 #define _(sym,string) string,
1381   foreach_ip4_sv_reass_handoff_error
1382 #undef _
1383 };
1384
1385 typedef struct
1386 {
1387   u32 next_worker_index;
1388 } ip4_sv_reass_handoff_trace_t;
1389
1390 static u8 *
1391 format_ip4_sv_reass_handoff_trace (u8 * s, va_list * args)
1392 {
1393   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1394   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1395   ip4_sv_reass_handoff_trace_t *t =
1396     va_arg (*args, ip4_sv_reass_handoff_trace_t *);
1397
1398   s =
1399     format (s, "ip4-sv-reassembly-handoff: next-worker %d",
1400             t->next_worker_index);
1401
1402   return s;
1403 }
1404
1405 always_inline uword
1406 ip4_sv_reass_handoff_node_inline (vlib_main_t * vm,
1407                                   vlib_node_runtime_t * node,
1408                                   vlib_frame_t * frame, bool is_feature)
1409 {
1410   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1411
1412   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1413   u32 n_enq, n_left_from, *from;
1414   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1415   u32 fq_index;
1416
1417   from = vlib_frame_vector_args (frame);
1418   n_left_from = frame->n_vectors;
1419   vlib_get_buffers (vm, from, bufs, n_left_from);
1420
1421   b = bufs;
1422   ti = thread_indices;
1423
1424   fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1425
1426   while (n_left_from > 0)
1427     {
1428       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1429
1430       if (PREDICT_FALSE
1431           ((node->flags & VLIB_NODE_FLAG_TRACE)
1432            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1433         {
1434           ip4_sv_reass_handoff_trace_t *t =
1435             vlib_add_trace (vm, node, b[0], sizeof (*t));
1436           t->next_worker_index = ti[0];
1437         }
1438
1439       n_left_from -= 1;
1440       ti += 1;
1441       b += 1;
1442     }
1443   n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from,
1444                                          thread_indices, frame->n_vectors, 1);
1445
1446   if (n_enq < frame->n_vectors)
1447     vlib_node_increment_counter (vm, node->node_index,
1448                                  IP4_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1449                                  frame->n_vectors - n_enq);
1450   return frame->n_vectors;
1451 }
1452
1453 VLIB_NODE_FN (ip4_sv_reass_handoff_node) (vlib_main_t * vm,
1454                                           vlib_node_runtime_t * node,
1455                                           vlib_frame_t * frame)
1456 {
1457   return ip4_sv_reass_handoff_node_inline (vm, node, frame,
1458                                            false /* is_feature */ );
1459 }
1460
1461
1462 /* *INDENT-OFF* */
1463 VLIB_REGISTER_NODE (ip4_sv_reass_handoff_node) = {
1464   .name = "ip4-sv-reassembly-handoff",
1465   .vector_size = sizeof (u32),
1466   .n_errors = ARRAY_LEN(ip4_sv_reass_handoff_error_strings),
1467   .error_strings = ip4_sv_reass_handoff_error_strings,
1468   .format_trace = format_ip4_sv_reass_handoff_trace,
1469
1470   .n_next_nodes = 1,
1471
1472   .next_nodes = {
1473     [0] = "error-drop",
1474   },
1475 };
1476 /* *INDENT-ON* */
1477
1478
1479 /* *INDENT-OFF* */
1480 VLIB_NODE_FN (ip4_sv_reass_feature_handoff_node) (vlib_main_t * vm,
1481                                                     vlib_node_runtime_t *
1482                                                     node,
1483                                                     vlib_frame_t * frame)
1484 {
1485   return ip4_sv_reass_handoff_node_inline (vm, node, frame,
1486                                              true /* is_feature */ );
1487 }
1488 /* *INDENT-ON* */
1489
1490
1491 /* *INDENT-OFF* */
1492 VLIB_REGISTER_NODE (ip4_sv_reass_feature_handoff_node) = {
1493   .name = "ip4-sv-reass-feature-hoff",
1494   .vector_size = sizeof (u32),
1495   .n_errors = ARRAY_LEN(ip4_sv_reass_handoff_error_strings),
1496   .error_strings = ip4_sv_reass_handoff_error_strings,
1497   .format_trace = format_ip4_sv_reass_handoff_trace,
1498
1499   .n_next_nodes = 1,
1500
1501   .next_nodes = {
1502     [0] = "error-drop",
1503   },
1504 };
1505 /* *INDENT-ON* */
1506
1507 #ifndef CLIB_MARCH_VARIANT
1508 int
1509 ip4_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1510 {
1511   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1512   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1513   if (is_enable)
1514     {
1515       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1516         {
1517           ++rm->feature_use_refcount_per_intf[sw_if_index];
1518           return vnet_feature_enable_disable ("ip4-unicast",
1519                                               "ip4-sv-reassembly-feature",
1520                                               sw_if_index, 1, 0, 0);
1521         }
1522       ++rm->feature_use_refcount_per_intf[sw_if_index];
1523     }
1524   else
1525     {
1526       if (rm->feature_use_refcount_per_intf[sw_if_index])
1527         --rm->feature_use_refcount_per_intf[sw_if_index];
1528       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1529         return vnet_feature_enable_disable ("ip4-unicast",
1530                                             "ip4-sv-reassembly-feature",
1531                                             sw_if_index, 0, 0, 0);
1532     }
1533   return 0;
1534 }
1535
1536 uword
1537 ip4_sv_reass_custom_register_next_node (uword node_index)
1538 {
1539   return vlib_node_add_next (vlib_get_main (), ip4_sv_reass_custom_node.index,
1540                              node_index);
1541 }
1542
1543 int
1544 ip4_sv_reass_output_enable_disable_with_refcnt (u32 sw_if_index,
1545                                                 int is_enable)
1546 {
1547   ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1548   vec_validate (rm->output_feature_use_refcount_per_intf, sw_if_index);
1549   if (is_enable)
1550     {
1551       if (!rm->output_feature_use_refcount_per_intf[sw_if_index])
1552         {
1553           ++rm->output_feature_use_refcount_per_intf[sw_if_index];
1554           return vnet_feature_enable_disable ("ip4-output",
1555                                               "ip4-sv-reassembly-output-feature",
1556                                               sw_if_index, 1, 0, 0);
1557         }
1558       ++rm->output_feature_use_refcount_per_intf[sw_if_index];
1559     }
1560   else
1561     {
1562       if (rm->output_feature_use_refcount_per_intf[sw_if_index])
1563         --rm->output_feature_use_refcount_per_intf[sw_if_index];
1564       if (!rm->output_feature_use_refcount_per_intf[sw_if_index])
1565         return vnet_feature_enable_disable ("ip4-output",
1566                                             "ip4-sv-reassembly-output-feature",
1567                                             sw_if_index, 0, 0, 0);
1568     }
1569   return 0;
1570 }
1571 #endif
1572
1573 /*
1574  * fd.io coding-style-patch-verification: ON
1575  *
1576  * Local Variables:
1577  * eval: (c-set-style "gnu")
1578  * End:
1579  */