src/vnet/ip/reass/ip6_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 IPv6 Shallow Virtual Reassembly.
  19  *
  20  * This file contains the source code for IPv6 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/ip6_to_ip4.h>
  27 #include <vppinfra/bihash_48_8.h>
  28 #include <vnet/ip/reass/ip6_sv_reass.h>
  29 #include <vnet/ip/ip6_inlines.h>
  30
  31 #define MSEC_PER_SEC 1000
  32 #define IP6_SV_REASS_TIMEOUT_DEFAULT_MS 100
  33 #define IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000      // 10 seconds default
  34 #define IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT 1024
  35 #define IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
  36 #define IP6_SV_REASS_HT_LOAD_FACTOR (0.75)
  37
  38 typedef enum
  39 {
  40   IP6_SV_REASS_RC_OK,
  41   IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS,
  42   IP6_SV_REASS_RC_INTERNAL_ERROR,
  43   IP6_SV_REASS_RC_UNSUPP_IP_PROTO,
  44 } ip6_sv_reass_rc_t;
  45
  46 typedef struct
  47 {
  48   union
  49   {
  50     struct
  51     {
  52       ip6_address_t src;
  53       ip6_address_t dst;
  54       u32 fib_index;
  55       u32 frag_id;
  56       u8 unused[7];
  57       u8 proto;
  58     };
  59     u64 as_u64[6];
  60   };
  61 } ip6_sv_reass_key_t;
  62
  63 typedef union
  64 {
  65   struct
  66   {
  67     u32 reass_index;
  68     u32 thread_index;
  69   };
  70   u64 as_u64;
  71 } ip6_sv_reass_val_t;
  72
  73 typedef union
  74 {
  75   struct
  76   {
  77     ip6_sv_reass_key_t k;
  78     ip6_sv_reass_val_t v;
  79   };
  80   clib_bihash_kv_48_8_t kv;
  81 } ip6_sv_reass_kv_t;
  82
  83 typedef struct
  84 {
  85   // hash table key
  86   ip6_sv_reass_key_t key;
  87   // time when last packet was received
  88   f64 last_heard;
  89   // internal id of this reassembly
  90   u64 id;
  91   // trace operation counter
  92   u32 trace_op_counter;
  93   // buffer indexes of buffers in this reassembly in chronological order -
  94   // including overlaps and duplicate fragments
  95   u32 *cached_buffers;
  96   // set to true when this reassembly is completed
  97   bool is_complete;
  98   // ip protocol
  99   u8 ip_proto;
 100   u8 icmp_type_or_tcp_flags;
 101   u32 tcp_ack_number;
 102   u32 tcp_seq_number;
 103   // l4 src port
 104   u16 l4_src_port;
 105   // l4 dst port
 106   u16 l4_dst_port;
 107   // lru indexes
 108   u32 lru_prev;
 109   u32 lru_next;
 110 } ip6_sv_reass_t;
 111
 112 typedef struct
 113 {
 114   ip6_sv_reass_t *pool;
 115   u32 reass_n;
 116   u32 id_counter;
 117   clib_spinlock_t lock;
 118   // lru indexes
 119   u32 lru_first;
 120   u32 lru_last;
 121 } ip6_sv_reass_per_thread_t;
 122
 123 typedef struct
 124 {
 125   // IPv6 config
 126   u32 timeout_ms;
 127   f64 timeout;
 128   u32 expire_walk_interval_ms;
 129   // maximum number of fragments in one reassembly
 130   u32 max_reass_len;
 131   // maximum number of reassemblies
 132   u32 max_reass_n;
 133
 134   // IPv6 runtime
 135   clib_bihash_48_8_t hash;
 136
 137   // per-thread data
 138   ip6_sv_reass_per_thread_t *per_thread_data;
 139
 140   // convenience
 141   vlib_main_t *vlib_main;
 142   vnet_main_t *vnet_main;
 143
 144   // node index of ip6-drop node
 145   u32 ip6_drop_idx;
 146   u32 ip6_icmp_error_idx;
 147   u32 ip6_sv_reass_expire_node_idx;
 148
 149   /** Worker handoff */
 150   u32 fq_index;
 151   u32 fq_feature_index;
 152
 153   // reference count for enabling/disabling feature - per interface
 154   u32 *feature_use_refcount_per_intf;
 155 } ip6_sv_reass_main_t;
 156
 157 extern ip6_sv_reass_main_t ip6_sv_reass_main;
 158
 159 #ifndef CLIB_MARCH_VARIANT
 160 ip6_sv_reass_main_t ip6_sv_reass_main;
 161 #endif /* CLIB_MARCH_VARIANT */
 162
 163 typedef enum
 164 {
 165   IP6_SV_REASSEMBLY_NEXT_INPUT,
 166   IP6_SV_REASSEMBLY_NEXT_DROP,
 167   IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR,
 168   IP6_SV_REASSEMBLY_NEXT_HANDOFF,
 169   IP6_SV_REASSEMBLY_N_NEXT,
 170 } ip6_sv_reass_next_t;
 171
 172 typedef enum
 173 {
 174   REASS_FRAGMENT_CACHE,
 175   REASS_FINISH,
 176   REASS_FRAGMENT_FORWARD,
 177   REASS_PASSTHROUGH,
 178 } ip6_sv_reass_trace_operation_e;
 179
 180 typedef struct
 181 {
 182   ip6_sv_reass_trace_operation_e action;
 183   u32 reass_id;
 184   u32 op_id;
 185   u8 ip_proto;
 186   u16 l4_src_port;
 187   u16 l4_dst_port;
 188 } ip6_sv_reass_trace_t;
 189
 190 static u8 *
 191 format_ip6_sv_reass_trace (u8 * s, va_list * args)
 192 {
 193   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 194   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 195   ip6_sv_reass_trace_t *t = va_arg (*args, ip6_sv_reass_trace_t *);
 196   if (REASS_PASSTHROUGH != t->action)
 197     {
 198       s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
 199     }
 200   switch (t->action)
 201     {
 202     case REASS_FRAGMENT_CACHE:
 203       s = format (s, "[cached]");
 204       break;
 205     case REASS_FINISH:
 206       s =
 207         format (s, "[finish, ip proto=%u, src_port=%u, dst_port=%u]",
 208                 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
 209                 clib_net_to_host_u16 (t->l4_dst_port));
 210       break;
 211     case REASS_FRAGMENT_FORWARD:
 212       s =
 213         format (s, "[forward, ip proto=%u, src_port=%u, dst_port=%u]",
 214                 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
 215                 clib_net_to_host_u16 (t->l4_dst_port));
 216       break;
 217     case REASS_PASSTHROUGH:
 218       s = format (s, "[not-fragmented]");
 219       break;
 220     }
 221   return s;
 222 }
 223
 224 static void
 225 ip6_sv_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 226                         ip6_sv_reass_t * reass, u32 bi,
 227                         ip6_sv_reass_trace_operation_e action,
 228                         u32 ip_proto, u16 l4_src_port, u16 l4_dst_port)
 229 {
 230   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 231   if (pool_is_free_index
 232       (vm->trace_main.trace_buffer_pool, vlib_buffer_get_trace_index (b)))
 233     {
 234       // this buffer's trace is gone
 235       b->flags &= ~VLIB_BUFFER_IS_TRACED;
 236       return;
 237     }
 238   ip6_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_ip6_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 always_inline void
 259 ip6_sv_reass_free (vlib_main_t * vm, ip6_sv_reass_main_t * rm,
 260                    ip6_sv_reass_per_thread_t * rt, ip6_sv_reass_t * reass)
 261 {
 262   clib_bihash_kv_48_8_t kv;
 263   kv.key[0] = reass->key.as_u64[0];
 264   kv.key[1] = reass->key.as_u64[1];
 265   kv.key[2] = reass->key.as_u64[2];
 266   kv.key[3] = reass->key.as_u64[3];
 267   kv.key[4] = reass->key.as_u64[4];
 268   kv.key[5] = reass->key.as_u64[5];
 269   clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
 270   vlib_buffer_free (vm, reass->cached_buffers,
 271                     vec_len (reass->cached_buffers));
 272   vec_free (reass->cached_buffers);
 273   reass->cached_buffers = NULL;
 274   if (~0 != reass->lru_prev)
 275     {
 276       ip6_sv_reass_t *lru_prev =
 277         pool_elt_at_index (rt->pool, reass->lru_prev);
 278       lru_prev->lru_next = reass->lru_next;
 279     }
 280   if (~0 != reass->lru_next)
 281     {
 282       ip6_sv_reass_t *lru_next =
 283         pool_elt_at_index (rt->pool, reass->lru_next);
 284       lru_next->lru_prev = reass->lru_prev;
 285     }
 286   if (rt->lru_first == reass - rt->pool)
 287     {
 288       rt->lru_first = reass->lru_next;
 289     }
 290   if (rt->lru_last == reass - rt->pool)
 291     {
 292       rt->lru_last = reass->lru_prev;
 293     }
 294   pool_put (rt->pool, reass);
 295   --rt->reass_n;
 296 }
 297
 298 always_inline void
 299 ip6_sv_reass_init (ip6_sv_reass_t * reass)
 300 {
 301   reass->cached_buffers = NULL;
 302   reass->is_complete = false;
 303 }
 304
 305 always_inline ip6_sv_reass_t *
 306 ip6_sv_reass_find_or_create (vlib_main_t *vm, ip6_sv_reass_main_t *rm,
 307                              ip6_sv_reass_per_thread_t *rt,
 308                              ip6_sv_reass_kv_t *kv, u8 *do_handoff)
 309 {
 310   ip6_sv_reass_t *reass = NULL;
 311   f64 now = vlib_time_now (vm);
 312
 313   if (!clib_bihash_search_48_8 (&rm->hash, &kv->kv, &kv->kv))
 314     {
 315       if (vm->thread_index != kv->v.thread_index)
 316         {
 317           *do_handoff = 1;
 318           return NULL;
 319         }
 320       reass = pool_elt_at_index (rt->pool, kv->v.reass_index);
 321
 322       if (now > reass->last_heard + rm->timeout)
 323         {
 324           ip6_sv_reass_free (vm, rm, rt, reass);
 325           reass = NULL;
 326         }
 327     }
 328
 329   if (reass)
 330     {
 331       reass->last_heard = now;
 332       return reass;
 333     }
 334
 335   if (rt->reass_n >= rm->max_reass_n)
 336     {
 337       reass = pool_elt_at_index (rt->pool, rt->lru_first);
 338       ip6_sv_reass_free (vm, rm, rt, reass);
 339     }
 340
 341   pool_get (rt->pool, reass);
 342   clib_memset (reass, 0, sizeof (*reass));
 343   reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 344   ++rt->id_counter;
 345   ip6_sv_reass_init (reass);
 346   ++rt->reass_n;
 347
 348   reass->lru_prev = reass->lru_next = ~0;
 349
 350   if (~0 != rt->lru_last)
 351     {
 352       ip6_sv_reass_t *lru_last = pool_elt_at_index (rt->pool, rt->lru_last);
 353       reass->lru_prev = rt->lru_last;
 354       lru_last->lru_next = rt->lru_last = reass - rt->pool;
 355     }
 356
 357   if (~0 == rt->lru_first)
 358     {
 359       rt->lru_first = rt->lru_last = reass - rt->pool;
 360     }
 361
 362   reass->key.as_u64[0] = kv->kv.key[0];
 363   reass->key.as_u64[1] = kv->kv.key[1];
 364   reass->key.as_u64[2] = kv->kv.key[2];
 365   reass->key.as_u64[3] = kv->kv.key[3];
 366   reass->key.as_u64[4] = kv->kv.key[4];
 367   reass->key.as_u64[5] = kv->kv.key[5];
 368   kv->v.reass_index = (reass - rt->pool);
 369   kv->v.thread_index = vm->thread_index;
 370   reass->last_heard = now;
 371
 372   if (clib_bihash_add_del_48_8 (&rm->hash, &kv->kv, 1))
 373     {
 374       ip6_sv_reass_free (vm, rm, rt, reass);
 375       reass = NULL;
 376     }
 377
 378   return reass;
 379 }
 380
 381 always_inline ip6_sv_reass_rc_t
 382 ip6_sv_reass_update (vlib_main_t *vm, vlib_node_runtime_t *node,
 383                      ip6_sv_reass_main_t *rm, ip6_sv_reass_t *reass, u32 bi0,
 384                      ip6_frag_hdr_t *frag_hdr)
 385 {
 386   vlib_buffer_t *fb = vlib_get_buffer (vm, bi0);
 387   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 388   fvnb->ip.reass.ip6_frag_hdr_offset =
 389     (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
 390   ip6_header_t *fip = vlib_buffer_get_current (fb);
 391   if (fb->current_length < sizeof (*fip) ||
 392       fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
 393       fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
 394     {
 395       return IP6_SV_REASS_RC_INTERNAL_ERROR;
 396     }
 397
 398   u32 fragment_first = fvnb->ip.reass.fragment_first =
 399     ip6_frag_hdr_offset_bytes (frag_hdr);
 400   u32 fragment_length =
 401     vlib_buffer_length_in_chain (vm, fb) -
 402     (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 403   u32 fragment_last = fvnb->ip.reass.fragment_last =
 404     fragment_first + fragment_length - 1;
 405   fvnb->ip.reass.range_first = fragment_first;
 406   fvnb->ip.reass.range_last = fragment_last;
 407   fvnb->ip.reass.next_range_bi = ~0;
 408   if (0 == fragment_first)
 409     {
 410       if (!ip6_get_port
 411           (vm, fb, fip, fb->current_length, &reass->ip_proto,
 412            &reass->l4_src_port, &reass->l4_dst_port,
 413            &reass->icmp_type_or_tcp_flags, &reass->tcp_ack_number,
 414            &reass->tcp_seq_number))
 415         return IP6_SV_REASS_RC_UNSUPP_IP_PROTO;
 416
 417       reass->is_complete = true;
 418       vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
 419       if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 420         {
 421           ip6_sv_reass_add_trace (vm, node, reass, bi0, REASS_FINISH,
 422                                   reass->ip_proto, reass->l4_src_port,
 423                                   reass->l4_dst_port);
 424         }
 425     }
 426   vec_add1 (reass->cached_buffers, bi0);
 427   if (!reass->is_complete)
 428     {
 429       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 430         {
 431           ip6_sv_reass_add_trace (vm, node, reass, bi0, REASS_FRAGMENT_CACHE,
 432                                   reass->ip_proto, reass->l4_src_port,
 433                                   reass->l4_dst_port);
 434         }
 435       if (vec_len (reass->cached_buffers) > rm->max_reass_len)
 436         {
 437           return IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS;
 438         }
 439     }
 440   return IP6_SV_REASS_RC_OK;
 441 }
 442
 443 always_inline bool
 444 ip6_sv_reass_verify_upper_layer_present (vlib_node_runtime_t *node,
 445                                          vlib_buffer_t *b,
 446                                          ip6_ext_hdr_chain_t *hc)
 447 {
 448   int nh = hc->eh[hc->length - 1].protocol;
 449   /* Checking to see if it's a terminating header */
 450   if (ip6_ext_hdr (nh))
 451     {
 452       icmp6_error_set_vnet_buffer (
 453         b, ICMP6_parameter_problem,
 454         ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain, 0);
 455       b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
 456       return false;
 457     }
 458   return true;
 459 }
 460
 461 always_inline bool
 462 ip6_sv_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
 463                                          vlib_buffer_t * b,
 464                                          ip6_frag_hdr_t * frag_hdr)
 465 {
 466   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 467   ip6_header_t *ip = vlib_buffer_get_current (b);
 468   int more_fragments = ip6_frag_hdr_more (frag_hdr);
 469   u32 fragment_length =
 470     vlib_buffer_length_in_chain (vm, b) -
 471     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 472   if (more_fragments && 0 != fragment_length % 8)
 473     {
 474       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 475                                    ICMP6_parameter_problem_erroneous_header_field,
 476                                    (u8 *) & ip->payload_length - (u8 *) ip);
 477       return false;
 478     }
 479   return true;
 480 }
 481
 482 always_inline bool
 483 ip6_sv_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
 484                                         vlib_buffer_t * b,
 485                                         ip6_frag_hdr_t * frag_hdr)
 486 {
 487   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 488   u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
 489   u32 fragment_length =
 490     vlib_buffer_length_in_chain (vm, b) -
 491     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 492   if (fragment_first + fragment_length > 65535)
 493     {
 494       ip6_header_t *ip0 = vlib_buffer_get_current (b);
 495       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 496                                    ICMP6_parameter_problem_erroneous_header_field,
 497                                    (u8 *) & frag_hdr->fragment_offset_and_more
 498                                    - (u8 *) ip0);
 499       return false;
 500     }
 501   return true;
 502 }
 503
 504 always_inline uword
 505 ip6_sv_reassembly_inline (vlib_main_t * vm,
 506                           vlib_node_runtime_t * node,
 507                           vlib_frame_t * frame, bool is_feature)
 508 {
 509   u32 *from = vlib_frame_vector_args (frame);
 510   u32 n_left_from, n_left_to_next, *to_next, next_index;
 511   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 512   ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
 513   clib_spinlock_lock (&rt->lock);
 514
 515   n_left_from = frame->n_vectors;
 516   next_index = node->cached_next_index;
 517
 518   while (n_left_from > 0)
 519     {
 520       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 521
 522       while (n_left_from > 0 && n_left_to_next > 0)
 523         {
 524           u32 bi0;
 525           vlib_buffer_t *b0;
 526           u32 next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 527           u32 error0 = IP6_ERROR_NONE;
 528
 529           bi0 = from[0];
 530           b0 = vlib_get_buffer (vm, bi0);
 531
 532           ip6_header_t *ip0 = vlib_buffer_get_current (b0);
 533           ip6_frag_hdr_t *frag_hdr;
 534           ip6_ext_hdr_chain_t hdr_chain;
 535
 536           int res = ip6_ext_header_walk (
 537             b0, ip0, IP_PROTOCOL_IPV6_FRAGMENTATION, &hdr_chain);
 538           if (res < 0 ||
 539               hdr_chain.eh[res].protocol != IP_PROTOCOL_IPV6_FRAGMENTATION)
 540             {
 541               // this is a regular packet - no fragmentation
 542               if (!ip6_get_port
 543                   (vm, b0, ip0, b0->current_length,
 544                    &(vnet_buffer (b0)->ip.reass.ip_proto),
 545                    &(vnet_buffer (b0)->ip.reass.l4_src_port),
 546                    &(vnet_buffer (b0)->ip.reass.l4_dst_port),
 547                    &(vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags),
 548                    &(vnet_buffer (b0)->ip.reass.tcp_ack_number),
 549                    &(vnet_buffer (b0)->ip.reass.tcp_seq_number)))
 550                 {
 551                   error0 = IP6_ERROR_REASS_UNSUPP_IP_PROTO;
 552                   b0->error = node->errors[error0];
 553                   next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 554                   goto packet_enqueue;
 555                 }
 556               vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
 557               next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
 558               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 559                 {
 560                   ip6_sv_reass_add_trace (
 561                     vm, node, NULL, bi0, REASS_PASSTHROUGH,
 562                     vnet_buffer (b0)->ip.reass.ip_proto,
 563                     vnet_buffer (b0)->ip.reass.l4_src_port,
 564                     vnet_buffer (b0)->ip.reass.l4_dst_port);
 565                 }
 566               goto packet_enqueue;
 567             }
 568           frag_hdr =
 569             ip6_ext_next_header_offset (ip0, hdr_chain.eh[res].offset);
 570           vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
 571             hdr_chain.eh[res].offset;
 572           if (0 == ip6_frag_hdr_offset (frag_hdr))
 573             {
 574               // first fragment - verify upper-layer is present
 575               if (!ip6_sv_reass_verify_upper_layer_present (node, b0,
 576                                                             &hdr_chain))
 577                 {
 578                   next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 579                   goto packet_enqueue;
 580                 }
 581             }
 582           if (!ip6_sv_reass_verify_fragment_multiple_8 (vm, b0, frag_hdr) ||
 583               !ip6_sv_reass_verify_packet_size_lt_64k (vm, b0, frag_hdr))
 584             {
 585               next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 586               goto packet_enqueue;
 587             }
 588
 589           ip6_sv_reass_kv_t kv;
 590           u8 do_handoff = 0;
 591
 592           kv.k.as_u64[0] = ip0->src_address.as_u64[0];
 593           kv.k.as_u64[1] = ip0->src_address.as_u64[1];
 594           kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
 595           kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
 596           kv.k.as_u64[4] =
 597             ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
 598                             vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
 599             (u64) frag_hdr->identification;
 600           kv.k.as_u64[5] = ip0->protocol;
 601
 602           ip6_sv_reass_t *reass =
 603             ip6_sv_reass_find_or_create (vm, rm, rt, &kv, &do_handoff);
 604
 605           if (PREDICT_FALSE (do_handoff))
 606             {
 607               next0 = IP6_SV_REASSEMBLY_NEXT_HANDOFF;
 608               vnet_buffer (b0)->ip.reass.owner_thread_index =
 609                 kv.v.thread_index;
 610               goto packet_enqueue;
 611             }
 612
 613           if (!reass)
 614             {
 615               next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 616               error0 = IP6_ERROR_REASS_LIMIT_REACHED;
 617               b0->error = node->errors[error0];
 618               goto packet_enqueue;
 619             }
 620
 621           if (reass->is_complete)
 622             {
 623               vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 624                 ! !ip6_frag_hdr_offset (frag_hdr);
 625               vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 626               vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 627                 reass->icmp_type_or_tcp_flags;
 628               vnet_buffer (b0)->ip.reass.tcp_ack_number =
 629                 reass->tcp_ack_number;
 630               vnet_buffer (b0)->ip.reass.tcp_seq_number =
 631                 reass->tcp_seq_number;
 632               vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 633               vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 634               next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
 635               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 636                 {
 637                   ip6_sv_reass_add_trace (
 638                     vm, node, reass, bi0, REASS_FRAGMENT_FORWARD,
 639                     reass->ip_proto, reass->l4_src_port, reass->l4_dst_port);
 640                 }
 641               goto packet_enqueue;
 642             }
 643
 644           u32 counter = ~0;
 645           switch (ip6_sv_reass_update (vm, node, rm, reass, bi0, frag_hdr))
 646             {
 647             case IP6_SV_REASS_RC_OK:
 648               /* nothing to do here */
 649               break;
 650             case IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS:
 651               counter = IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG;
 652               break;
 653             case IP6_SV_REASS_RC_UNSUPP_IP_PROTO:
 654               counter = IP6_ERROR_REASS_UNSUPP_IP_PROTO;
 655               break;
 656             case IP6_SV_REASS_RC_INTERNAL_ERROR:
 657               counter = IP6_ERROR_REASS_INTERNAL_ERROR;
 658               break;
 659             }
 660           if (~0 != counter)
 661             {
 662               vlib_node_increment_counter (vm, node->node_index, counter, 1);
 663               ip6_sv_reass_free (vm, rm, rt, reass);
 664               goto next_packet;
 665             }
 666
 667           if (reass->is_complete)
 668             {
 669               u32 idx;
 670               vec_foreach_index (idx, reass->cached_buffers)
 671               {
 672                 u32 bi0 = vec_elt (reass->cached_buffers, idx);
 673                 if (0 == n_left_to_next)
 674                   {
 675                     vlib_put_next_frame (vm, node, next_index,
 676                                          n_left_to_next);
 677                     vlib_get_next_frame (vm, node, next_index, to_next,
 678                                          n_left_to_next);
 679                   }
 680                 to_next[0] = bi0;
 681                 to_next += 1;
 682                 n_left_to_next -= 1;
 683                 b0 = vlib_get_buffer (vm, bi0);
 684                 if (is_feature)
 685                   {
 686                     vnet_feature_next (&next0, b0);
 687                   }
 688                 frag_hdr =
 689                   vlib_buffer_get_current (b0) +
 690                   vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset;
 691                 vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 692                   ! !ip6_frag_hdr_offset (frag_hdr);
 693                 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 694                 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 695                   reass->icmp_type_or_tcp_flags;
 696                 vnet_buffer (b0)->ip.reass.tcp_ack_number =
 697                   reass->tcp_ack_number;
 698                 vnet_buffer (b0)->ip.reass.tcp_seq_number =
 699                   reass->tcp_seq_number;
 700                 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 701                 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 702                 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 703                   {
 704                     ip6_sv_reass_add_trace (
 705                       vm, node, reass, bi0, REASS_FRAGMENT_FORWARD,
 706                       reass->ip_proto, reass->l4_src_port, reass->l4_dst_port);
 707                   }
 708                 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 709                                                  to_next, n_left_to_next, bi0,
 710                                                  next0);
 711               }
 712               _vec_len (reass->cached_buffers) = 0;     // buffers are owned by frame now
 713             }
 714           goto next_packet;
 715
 716         packet_enqueue:
 717           to_next[0] = bi0;
 718           to_next += 1;
 719           n_left_to_next -= 1;
 720           if (is_feature && IP6_ERROR_NONE == error0)
 721             {
 722               b0 = vlib_get_buffer (vm, bi0);
 723               vnet_feature_next (&next0, b0);
 724             }
 725           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 726                                            n_left_to_next, bi0, next0);
 727
 728         next_packet:
 729           from += 1;
 730           n_left_from -= 1;
 731         }
 732
 733       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 734     }
 735
 736   clib_spinlock_unlock (&rt->lock);
 737   return frame->n_vectors;
 738 }
 739
 740 static char *ip6_sv_reassembly_error_strings[] = {
 741 #define _(sym, string) string,
 742   foreach_ip6_error
 743 #undef _
 744 };
 745
 746 VLIB_NODE_FN (ip6_sv_reass_node) (vlib_main_t * vm,
 747                                   vlib_node_runtime_t * node,
 748                                   vlib_frame_t * frame)
 749 {
 750   return ip6_sv_reassembly_inline (vm, node, frame, false /* is_feature */ );
 751 }
 752
 753 /* *INDENT-OFF* */
 754 VLIB_REGISTER_NODE (ip6_sv_reass_node) = {
 755     .name = "ip6-sv-reassembly",
 756     .vector_size = sizeof (u32),
 757     .format_trace = format_ip6_sv_reass_trace,
 758     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
 759     .error_strings = ip6_sv_reassembly_error_strings,
 760     .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
 761     .next_nodes =
 762         {
 763                 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
 764                 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
 765                 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
 766                 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reassembly-handoff",
 767         },
 768 };
 769 /* *INDENT-ON* */
 770
 771 VLIB_NODE_FN (ip6_sv_reass_node_feature) (vlib_main_t * vm,
 772                                           vlib_node_runtime_t * node,
 773                                           vlib_frame_t * frame)
 774 {
 775   return ip6_sv_reassembly_inline (vm, node, frame, true /* is_feature */ );
 776 }
 777
 778 /* *INDENT-OFF* */
 779 VLIB_REGISTER_NODE (ip6_sv_reass_node_feature) = {
 780     .name = "ip6-sv-reassembly-feature",
 781     .vector_size = sizeof (u32),
 782     .format_trace = format_ip6_sv_reass_trace,
 783     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
 784     .error_strings = ip6_sv_reassembly_error_strings,
 785     .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
 786     .next_nodes =
 787         {
 788                 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
 789                 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
 790                 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
 791                 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reass-feature-hoff",
 792         },
 793 };
 794 /* *INDENT-ON* */
 795
 796 /* *INDENT-OFF* */
 797 VNET_FEATURE_INIT (ip6_sv_reassembly_feature) = {
 798     .arc_name = "ip6-unicast",
 799     .node_name = "ip6-sv-reassembly-feature",
 800     .runs_before = VNET_FEATURES ("ip6-lookup"),
 801     .runs_after = 0,
 802 };
 803 /* *INDENT-ON* */
 804
 805 #ifndef CLIB_MARCH_VARIANT
 806 static u32
 807 ip6_sv_reass_get_nbuckets ()
 808 {
 809   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 810   u32 nbuckets;
 811   u8 i;
 812
 813   nbuckets = (u32) (rm->max_reass_n / IP6_SV_REASS_HT_LOAD_FACTOR);
 814
 815   for (i = 0; i < 31; i++)
 816     if ((1 << i) >= nbuckets)
 817       break;
 818   nbuckets = 1 << i;
 819
 820   return nbuckets;
 821 }
 822 #endif /* CLIB_MARCH_VARIANT */
 823
 824 typedef enum
 825 {
 826   IP6_EVENT_CONFIG_CHANGED = 1,
 827 } ip6_sv_reass_event_t;
 828
 829 #ifndef CLIB_MARCH_VARIANT
 830 typedef struct
 831 {
 832   int failure;
 833   clib_bihash_48_8_t *new_hash;
 834 } ip6_rehash_cb_ctx;
 835
 836 static int
 837 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
 838 {
 839   ip6_rehash_cb_ctx *ctx = _ctx;
 840   if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
 841     {
 842       ctx->failure = 1;
 843     }
 844   return (BIHASH_WALK_CONTINUE);
 845 }
 846
 847 static void
 848 ip6_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
 849                          u32 max_reassembly_length,
 850                          u32 expire_walk_interval_ms)
 851 {
 852   ip6_sv_reass_main.timeout_ms = timeout_ms;
 853   ip6_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
 854   ip6_sv_reass_main.max_reass_n = max_reassemblies;
 855   ip6_sv_reass_main.max_reass_len = max_reassembly_length;
 856   ip6_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
 857 }
 858
 859 vnet_api_error_t
 860 ip6_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
 861                   u32 max_reassembly_length, u32 expire_walk_interval_ms)
 862 {
 863   u32 old_nbuckets = ip6_sv_reass_get_nbuckets ();
 864   ip6_sv_reass_set_params (timeout_ms, max_reassemblies,
 865                            max_reassembly_length, expire_walk_interval_ms);
 866   vlib_process_signal_event (ip6_sv_reass_main.vlib_main,
 867                              ip6_sv_reass_main.ip6_sv_reass_expire_node_idx,
 868                              IP6_EVENT_CONFIG_CHANGED, 0);
 869   u32 new_nbuckets = ip6_sv_reass_get_nbuckets ();
 870   if (ip6_sv_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
 871     {
 872       clib_bihash_48_8_t new_hash;
 873       clib_memset (&new_hash, 0, sizeof (new_hash));
 874       ip6_rehash_cb_ctx ctx;
 875       ctx.failure = 0;
 876       ctx.new_hash = &new_hash;
 877       clib_bihash_init_48_8 (&new_hash, "ip6-sv-reass", new_nbuckets,
 878                              new_nbuckets * 1024);
 879       clib_bihash_foreach_key_value_pair_48_8 (&ip6_sv_reass_main.hash,
 880                                                ip6_rehash_cb, &ctx);
 881       if (ctx.failure)
 882         {
 883           clib_bihash_free_48_8 (&new_hash);
 884           return -1;
 885         }
 886       else
 887         {
 888           clib_bihash_free_48_8 (&ip6_sv_reass_main.hash);
 889           clib_memcpy_fast (&ip6_sv_reass_main.hash, &new_hash,
 890                             sizeof (ip6_sv_reass_main.hash));
 891           clib_bihash_copied (&ip6_sv_reass_main.hash, &new_hash);
 892         }
 893     }
 894   return 0;
 895 }
 896
 897 vnet_api_error_t
 898 ip6_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
 899                   u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
 900 {
 901   *timeout_ms = ip6_sv_reass_main.timeout_ms;
 902   *max_reassemblies = ip6_sv_reass_main.max_reass_n;
 903   *max_reassembly_length = ip6_sv_reass_main.max_reass_len;
 904   *expire_walk_interval_ms = ip6_sv_reass_main.expire_walk_interval_ms;
 905   return 0;
 906 }
 907
 908 static clib_error_t *
 909 ip6_sv_reass_init_function (vlib_main_t * vm)
 910 {
 911   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 912   clib_error_t *error = 0;
 913   u32 nbuckets;
 914   vlib_node_t *node;
 915
 916   rm->vlib_main = vm;
 917   rm->vnet_main = vnet_get_main ();
 918
 919   vec_validate (rm->per_thread_data, vlib_num_workers ());
 920   ip6_sv_reass_per_thread_t *rt;
 921   vec_foreach (rt, rm->per_thread_data)
 922   {
 923     clib_spinlock_init (&rt->lock);
 924     pool_alloc (rt->pool, rm->max_reass_n);
 925     rt->lru_first = rt->lru_last = ~0;
 926   }
 927
 928   node = vlib_get_node_by_name (vm, (u8 *) "ip6-sv-reassembly-expire-walk");
 929   ASSERT (node);
 930   rm->ip6_sv_reass_expire_node_idx = node->index;
 931
 932   ip6_sv_reass_set_params (IP6_SV_REASS_TIMEOUT_DEFAULT_MS,
 933                            IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
 934                            IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
 935                            IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
 936
 937   nbuckets = ip6_sv_reass_get_nbuckets ();
 938   clib_bihash_init_48_8 (&rm->hash, "ip6-sv-reass", nbuckets,
 939                          nbuckets * 1024);
 940
 941   node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
 942   ASSERT (node);
 943   rm->ip6_drop_idx = node->index;
 944   node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
 945   ASSERT (node);
 946   rm->ip6_icmp_error_idx = node->index;
 947
 948   if ((error = vlib_call_init_function (vm, ip_main_init)))
 949     return error;
 950
 951   rm->fq_index = vlib_frame_queue_main_init (ip6_sv_reass_node.index, 0);
 952   rm->fq_feature_index =
 953     vlib_frame_queue_main_init (ip6_sv_reass_node_feature.index, 0);
 954
 955   rm->feature_use_refcount_per_intf = NULL;
 956
 957   return error;
 958 }
 959
 960 VLIB_INIT_FUNCTION (ip6_sv_reass_init_function);
 961 #endif /* CLIB_MARCH_VARIANT */
 962
 963 static uword
 964 ip6_sv_reass_walk_expired (vlib_main_t *vm,
 965                            CLIB_UNUSED (vlib_node_runtime_t *node),
 966                            CLIB_UNUSED (vlib_frame_t *f))
 967 {
 968   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 969   uword event_type, *event_data = 0;
 970
 971   while (true)
 972     {
 973       vlib_process_wait_for_event_or_clock (vm,
 974                                             (f64) rm->expire_walk_interval_ms
 975                                             / (f64) MSEC_PER_SEC);
 976       event_type = vlib_process_get_events (vm, &event_data);
 977
 978       switch (event_type)
 979         {
 980         case ~0:
 981           /* no events => timeout */
 982           /* fallthrough */
 983         case IP6_EVENT_CONFIG_CHANGED:
 984           /* nothing to do here */
 985           break;
 986         default:
 987           clib_warning ("BUG: event type 0x%wx", event_type);
 988           break;
 989         }
 990       f64 now = vlib_time_now (vm);
 991
 992       ip6_sv_reass_t *reass;
 993       int *pool_indexes_to_free = NULL;
 994
 995       uword thread_index = 0;
 996       int index;
 997       const uword nthreads = vlib_num_workers () + 1;
 998       for (thread_index = 0; thread_index < nthreads; ++thread_index)
 999         {
1000           ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1001           clib_spinlock_lock (&rt->lock);
1002
1003           vec_reset_length (pool_indexes_to_free);
1004           /* *INDENT-OFF* */
1005           pool_foreach_index (index, rt->pool)  {
1006                                 reass = pool_elt_at_index (rt->pool, index);
1007                                 if (now > reass->last_heard + rm->timeout)
1008                                   {
1009                                     vec_add1 (pool_indexes_to_free, index);
1010                                   }
1011                               }
1012           /* *INDENT-ON* */
1013           int *i;
1014           /* *INDENT-OFF* */
1015           vec_foreach (i, pool_indexes_to_free)
1016           {
1017             ip6_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1018             ip6_sv_reass_free (vm, rm, rt, reass);
1019           }
1020           /* *INDENT-ON* */
1021
1022           clib_spinlock_unlock (&rt->lock);
1023         }
1024
1025       vec_free (pool_indexes_to_free);
1026       if (event_data)
1027         {
1028           _vec_len (event_data) = 0;
1029         }
1030     }
1031
1032   return 0;
1033 }
1034
1035 /* *INDENT-OFF* */
1036 VLIB_REGISTER_NODE (ip6_sv_reass_expire_node) = {
1037     .function = ip6_sv_reass_walk_expired,
1038     .format_trace = format_ip6_sv_reass_trace,
1039     .type = VLIB_NODE_TYPE_PROCESS,
1040     .name = "ip6-sv-reassembly-expire-walk",
1041
1042     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
1043     .error_strings = ip6_sv_reassembly_error_strings,
1044
1045 };
1046 /* *INDENT-ON* */
1047
1048 static u8 *
1049 format_ip6_sv_reass_key (u8 * s, va_list * args)
1050 {
1051   ip6_sv_reass_key_t *key = va_arg (*args, ip6_sv_reass_key_t *);
1052   s =
1053     format (s, "fib_index: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1054             key->fib_index, format_ip6_address, &key->src, format_ip6_address,
1055             &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1056   return s;
1057 }
1058
1059 static u8 *
1060 format_ip6_sv_reass (u8 * s, va_list * args)
1061 {
1062   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1063   ip6_sv_reass_t *reass = va_arg (*args, ip6_sv_reass_t *);
1064
1065   s = format (s, "ID: %lu, key: %U, trace_op_counter: %u\n",
1066               reass->id, format_ip6_sv_reass_key, &reass->key,
1067               reass->trace_op_counter);
1068   vlib_buffer_t *b;
1069   u32 *bip;
1070   u32 counter = 0;
1071   vec_foreach (bip, reass->cached_buffers)
1072   {
1073     u32 bi = *bip;
1074     do
1075       {
1076         b = vlib_get_buffer (vm, bi);
1077         s = format (s, "  #%03u: bi: %u\n", counter, bi);
1078         ++counter;
1079         bi = b->next_buffer;
1080       }
1081     while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1082   }
1083   return s;
1084 }
1085
1086 static clib_error_t *
1087 show_ip6_sv_reass (vlib_main_t * vm, unformat_input_t * input,
1088                    CLIB_UNUSED (vlib_cli_command_t * lmd))
1089 {
1090   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1091
1092   vlib_cli_output (vm, "---------------------");
1093   vlib_cli_output (vm, "IP6 reassembly status");
1094   vlib_cli_output (vm, "---------------------");
1095   bool details = false;
1096   if (unformat (input, "details"))
1097     {
1098       details = true;
1099     }
1100
1101   u32 sum_reass_n = 0;
1102   u64 sum_buffers_n = 0;
1103   ip6_sv_reass_t *reass;
1104   uword thread_index;
1105   const uword nthreads = vlib_num_workers () + 1;
1106   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1107     {
1108       ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1109       clib_spinlock_lock (&rt->lock);
1110       if (details)
1111         {
1112           /* *INDENT-OFF* */
1113           pool_foreach (reass, rt->pool) {
1114             vlib_cli_output (vm, "%U", format_ip6_sv_reass, vm, reass);
1115           }
1116           /* *INDENT-ON* */
1117         }
1118       sum_reass_n += rt->reass_n;
1119       clib_spinlock_unlock (&rt->lock);
1120     }
1121   vlib_cli_output (vm, "---------------------");
1122   vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1123                    (long unsigned) sum_reass_n);
1124   vlib_cli_output (vm,
1125                    "Maximum configured concurrent shallow virtual IP6 reassemblies per worker-thread: %lu\n",
1126                    (long unsigned) rm->max_reass_n);
1127   vlib_cli_output (vm,
1128                    "Maximum configured amount of fragments per shallow "
1129                    "virtual IP6 reassembly: %lu\n",
1130                    (long unsigned) rm->max_reass_len);
1131   vlib_cli_output (vm,
1132                    "Maximum configured shallow virtual IP6 reassembly timeout: %lums\n",
1133                    (long unsigned) rm->timeout_ms);
1134   vlib_cli_output (vm,
1135                    "Maximum configured shallow virtual IP6 reassembly expire walk interval: %lums\n",
1136                    (long unsigned) rm->expire_walk_interval_ms);
1137   vlib_cli_output (vm, "Buffers in use: %lu\n",
1138                    (long unsigned) sum_buffers_n);
1139   return 0;
1140 }
1141
1142 /* *INDENT-OFF* */
1143 VLIB_CLI_COMMAND (show_ip6_sv_reassembly_cmd, static) = {
1144     .path = "show ip6-sv-reassembly",
1145     .short_help = "show ip6-sv-reassembly [details]",
1146     .function = show_ip6_sv_reass,
1147 };
1148 /* *INDENT-ON* */
1149
1150 #ifndef CLIB_MARCH_VARIANT
1151 vnet_api_error_t
1152 ip6_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1153 {
1154   return ip6_sv_reass_enable_disable_with_refcnt (sw_if_index,
1155                                                   enable_disable);
1156 }
1157 #endif /* CLIB_MARCH_VARIANT */
1158
1159 #define foreach_ip6_sv_reassembly_handoff_error                       \
1160 _(CONGESTION_DROP, "congestion drop")
1161
1162
1163 typedef enum
1164 {
1165 #define _(sym,str) IP6_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
1166   foreach_ip6_sv_reassembly_handoff_error
1167 #undef _
1168     IP6_SV_REASSEMBLY_HANDOFF_N_ERROR,
1169 } ip6_sv_reassembly_handoff_error_t;
1170
1171 static char *ip6_sv_reassembly_handoff_error_strings[] = {
1172 #define _(sym,string) string,
1173   foreach_ip6_sv_reassembly_handoff_error
1174 #undef _
1175 };
1176
1177 typedef struct
1178 {
1179   u32 next_worker_index;
1180 } ip6_sv_reassembly_handoff_trace_t;
1181
1182 static u8 *
1183 format_ip6_sv_reassembly_handoff_trace (u8 * s, va_list * args)
1184 {
1185   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1186   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1187   ip6_sv_reassembly_handoff_trace_t *t =
1188     va_arg (*args, ip6_sv_reassembly_handoff_trace_t *);
1189
1190   s =
1191     format (s, "ip6-sv-reassembly-handoff: next-worker %d",
1192             t->next_worker_index);
1193
1194   return s;
1195 }
1196
1197 always_inline uword
1198 ip6_sv_reassembly_handoff_inline (vlib_main_t * vm,
1199                                   vlib_node_runtime_t * node,
1200                                   vlib_frame_t * frame, bool is_feature)
1201 {
1202   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1203
1204   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1205   u32 n_enq, n_left_from, *from;
1206   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1207   u32 fq_index;
1208
1209   from = vlib_frame_vector_args (frame);
1210   n_left_from = frame->n_vectors;
1211   vlib_get_buffers (vm, from, bufs, n_left_from);
1212
1213   b = bufs;
1214   ti = thread_indices;
1215
1216   fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1217
1218   while (n_left_from > 0)
1219     {
1220       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1221
1222       if (PREDICT_FALSE
1223           ((node->flags & VLIB_NODE_FLAG_TRACE)
1224            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1225         {
1226           ip6_sv_reassembly_handoff_trace_t *t =
1227             vlib_add_trace (vm, node, b[0], sizeof (*t));
1228           t->next_worker_index = ti[0];
1229         }
1230
1231       n_left_from -= 1;
1232       ti += 1;
1233       b += 1;
1234     }
1235   n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from,
1236                                          thread_indices, frame->n_vectors, 1);
1237
1238   if (n_enq < frame->n_vectors)
1239     vlib_node_increment_counter (vm, node->node_index,
1240                                  IP6_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1241                                  frame->n_vectors - n_enq);
1242   return frame->n_vectors;
1243 }
1244
1245 VLIB_NODE_FN (ip6_sv_reassembly_handoff_node) (vlib_main_t * vm,
1246                                                vlib_node_runtime_t * node,
1247                                                vlib_frame_t * frame)
1248 {
1249   return ip6_sv_reassembly_handoff_inline (vm, node, frame,
1250                                            false /* is_feature */ );
1251 }
1252
1253 /* *INDENT-OFF* */
1254 VLIB_REGISTER_NODE (ip6_sv_reassembly_handoff_node) = {
1255   .name = "ip6-sv-reassembly-handoff",
1256   .vector_size = sizeof (u32),
1257   .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1258   .error_strings = ip6_sv_reassembly_handoff_error_strings,
1259   .format_trace = format_ip6_sv_reassembly_handoff_trace,
1260
1261   .n_next_nodes = 1,
1262
1263   .next_nodes = {
1264     [0] = "error-drop",
1265   },
1266 };
1267
1268
1269 VLIB_NODE_FN (ip6_sv_reassembly_feature_handoff_node) (vlib_main_t * vm,
1270                                vlib_node_runtime_t * node, vlib_frame_t * frame)
1271 {
1272   return ip6_sv_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1273 }
1274
1275
1276 /* *INDENT-OFF* */
1277 VLIB_REGISTER_NODE (ip6_sv_reassembly_feature_handoff_node) = {
1278   .name = "ip6-sv-reass-feature-hoff",
1279   .vector_size = sizeof (u32),
1280   .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1281   .error_strings = ip6_sv_reassembly_handoff_error_strings,
1282   .format_trace = format_ip6_sv_reassembly_handoff_trace,
1283
1284   .n_next_nodes = 1,
1285
1286   .next_nodes = {
1287     [0] = "error-drop",
1288   },
1289 };
1290 /* *INDENT-ON* */
1291
1292 #ifndef CLIB_MARCH_VARIANT
1293 int
1294 ip6_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1295 {
1296   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1297   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1298   if (is_enable)
1299     {
1300       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1301         {
1302           ++rm->feature_use_refcount_per_intf[sw_if_index];
1303           return vnet_feature_enable_disable ("ip6-unicast",
1304                                               "ip6-sv-reassembly-feature",
1305                                               sw_if_index, 1, 0, 0);
1306         }
1307       ++rm->feature_use_refcount_per_intf[sw_if_index];
1308     }
1309   else
1310     {
1311       --rm->feature_use_refcount_per_intf[sw_if_index];
1312       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1313         return vnet_feature_enable_disable ("ip6-unicast",
1314                                             "ip6-sv-reassembly-feature",
1315                                             sw_if_index, 0, 0, 0);
1316     }
1317   return 0;
1318 }
1319 #endif
1320
1321 /*
1322  * fd.io coding-style-patch-verification: ON
1323  *
1324  * Local Variables:
1325  * eval: (c-set-style "gnu")
1326  * End:
1327  */