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
  30 #define MSEC_PER_SEC 1000
  31 #define IP6_SV_REASS_TIMEOUT_DEFAULT_MS 100
  32 #define IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000      // 10 seconds default
  33 #define IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT 1024
  34 #define IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
  35 #define IP6_SV_REASS_HT_LOAD_FACTOR (0.75)
  36
  37 typedef enum
  38 {
  39   IP6_SV_REASS_RC_OK,
  40   IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS,
  41   IP6_SV_REASS_RC_INTERNAL_ERROR,
  42   IP6_SV_REASS_RC_UNSUPP_IP_PROTO,
  43 } ip6_sv_reass_rc_t;
  44
  45 typedef struct
  46 {
  47   union
  48   {
  49     struct
  50     {
  51       ip6_address_t src;
  52       ip6_address_t dst;
  53       u32 xx_id;
  54       u32 frag_id;
  55       u8 unused[7];
  56       u8 proto;
  57     };
  58     u64 as_u64[6];
  59   };
  60 } ip6_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 } ip6_sv_reass_val_t;
  71
  72 typedef union
  73 {
  74   struct
  75   {
  76     ip6_sv_reass_key_t k;
  77     ip6_sv_reass_val_t v;
  78   };
  79   clib_bihash_kv_48_8_t kv;
  80 } ip6_sv_reass_kv_t;
  81
  82 typedef struct
  83 {
  84   // hash table key
  85   ip6_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   // buffer indexes of buffers in this reassembly in chronological order -
  93   // including overlaps and duplicate fragments
  94   u32 *cached_buffers;
  95   // set to true when this reassembly is completed
  96   bool is_complete;
  97   // ip protocol
  98   u8 ip_proto;
  99   u8 icmp_type_or_tcp_flags;
 100   u32 tcp_ack_number;
 101   u32 tcp_seq_number;
 102   // l4 src port
 103   u16 l4_src_port;
 104   // l4 dst port
 105   u16 l4_dst_port;
 106   // lru indexes
 107   u32 lru_prev;
 108   u32 lru_next;
 109 } ip6_sv_reass_t;
 110
 111 typedef struct
 112 {
 113   ip6_sv_reass_t *pool;
 114   u32 reass_n;
 115   u32 id_counter;
 116   clib_spinlock_t lock;
 117   // lru indexes
 118   u32 lru_first;
 119   u32 lru_last;
 120 } ip6_sv_reass_per_thread_t;
 121
 122 typedef struct
 123 {
 124   // IPv6 config
 125   u32 timeout_ms;
 126   f64 timeout;
 127   u32 expire_walk_interval_ms;
 128   // maximum number of fragments in one reassembly
 129   u32 max_reass_len;
 130   // maximum number of reassemblies
 131   u32 max_reass_n;
 132
 133   // IPv6 runtime
 134   clib_bihash_48_8_t hash;
 135
 136   // per-thread data
 137   ip6_sv_reass_per_thread_t *per_thread_data;
 138
 139   // convenience
 140   vlib_main_t *vlib_main;
 141   vnet_main_t *vnet_main;
 142
 143   // node index of ip6-drop node
 144   u32 ip6_drop_idx;
 145   u32 ip6_icmp_error_idx;
 146   u32 ip6_sv_reass_expire_node_idx;
 147
 148   /** Worker handoff */
 149   u32 fq_index;
 150   u32 fq_feature_index;
 151
 152   // reference count for enabling/disabling feature - per interface
 153   u32 *feature_use_refcount_per_intf;
 154 } ip6_sv_reass_main_t;
 155
 156 extern ip6_sv_reass_main_t ip6_sv_reass_main;
 157
 158 #ifndef CLIB_MARCH_VARIANT
 159 ip6_sv_reass_main_t ip6_sv_reass_main;
 160 #endif /* CLIB_MARCH_VARIANT */
 161
 162 typedef enum
 163 {
 164   IP6_SV_REASSEMBLY_NEXT_INPUT,
 165   IP6_SV_REASSEMBLY_NEXT_DROP,
 166   IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR,
 167   IP6_SV_REASSEMBLY_NEXT_HANDOFF,
 168   IP6_SV_REASSEMBLY_N_NEXT,
 169 } ip6_sv_reass_next_t;
 170
 171 typedef enum
 172 {
 173   REASS_FRAGMENT_CACHE,
 174   REASS_FINISH,
 175   REASS_FRAGMENT_FORWARD,
 176   REASS_PASSTHROUGH,
 177 } ip6_sv_reass_trace_operation_e;
 178
 179 typedef struct
 180 {
 181   ip6_sv_reass_trace_operation_e action;
 182   u32 reass_id;
 183   u32 op_id;
 184   u8 ip_proto;
 185   u16 l4_src_port;
 186   u16 l4_dst_port;
 187 } ip6_sv_reass_trace_t;
 188
 189 static u8 *
 190 format_ip6_sv_reass_trace (u8 * s, va_list * args)
 191 {
 192   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 193   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 194   ip6_sv_reass_trace_t *t = va_arg (*args, ip6_sv_reass_trace_t *);
 195   if (REASS_PASSTHROUGH != t->action)
 196     {
 197       s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
 198     }
 199   switch (t->action)
 200     {
 201     case REASS_FRAGMENT_CACHE:
 202       s = format (s, "[cached]");
 203       break;
 204     case REASS_FINISH:
 205       s =
 206         format (s, "[finish, ip proto=%u, src_port=%u, dst_port=%u]",
 207                 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
 208                 clib_net_to_host_u16 (t->l4_dst_port));
 209       break;
 210     case REASS_FRAGMENT_FORWARD:
 211       s =
 212         format (s, "[forward, ip proto=%u, src_port=%u, dst_port=%u]",
 213                 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
 214                 clib_net_to_host_u16 (t->l4_dst_port));
 215       break;
 216     case REASS_PASSTHROUGH:
 217       s = format (s, "[not-fragmented]");
 218       break;
 219     }
 220   return s;
 221 }
 222
 223 static void
 224 ip6_sv_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 225                         ip6_sv_reass_main_t * rm,
 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   ip6_sv_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 232   if (reass)
 233     {
 234       t->reass_id = reass->id;
 235       t->op_id = reass->trace_op_counter;
 236       ++reass->trace_op_counter;
 237     }
 238   t->action = action;
 239   t->ip_proto = ip_proto;
 240   t->l4_src_port = l4_src_port;
 241   t->l4_dst_port = l4_dst_port;
 242 #if 0
 243   static u8 *s = NULL;
 244   s = format (s, "%U", format_ip6_sv_reass_trace, NULL, NULL, t);
 245   printf ("%.*s\n", vec_len (s), s);
 246   fflush (stdout);
 247   vec_reset_length (s);
 248 #endif
 249 }
 250
 251 always_inline void
 252 ip6_sv_reass_free (vlib_main_t * vm, ip6_sv_reass_main_t * rm,
 253                    ip6_sv_reass_per_thread_t * rt, ip6_sv_reass_t * reass)
 254 {
 255   clib_bihash_kv_48_8_t kv;
 256   kv.key[0] = reass->key.as_u64[0];
 257   kv.key[1] = reass->key.as_u64[1];
 258   kv.key[2] = reass->key.as_u64[2];
 259   kv.key[3] = reass->key.as_u64[3];
 260   kv.key[4] = reass->key.as_u64[4];
 261   kv.key[5] = reass->key.as_u64[5];
 262   clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
 263   vlib_buffer_free (vm, reass->cached_buffers,
 264                     vec_len (reass->cached_buffers));
 265   vec_free (reass->cached_buffers);
 266   reass->cached_buffers = NULL;
 267   if (~0 != reass->lru_prev)
 268     {
 269       ip6_sv_reass_t *lru_prev =
 270         pool_elt_at_index (rt->pool, reass->lru_prev);
 271       lru_prev->lru_next = reass->lru_next;
 272     }
 273   if (~0 != reass->lru_next)
 274     {
 275       ip6_sv_reass_t *lru_next =
 276         pool_elt_at_index (rt->pool, reass->lru_next);
 277       lru_next->lru_prev = reass->lru_prev;
 278     }
 279   if (rt->lru_first == reass - rt->pool)
 280     {
 281       rt->lru_first = reass->lru_next;
 282     }
 283   if (rt->lru_last == reass - rt->pool)
 284     {
 285       rt->lru_last = reass->lru_prev;
 286     }
 287   pool_put (rt->pool, reass);
 288   --rt->reass_n;
 289 }
 290
 291 always_inline void
 292 ip6_sv_reass_init (ip6_sv_reass_t * reass)
 293 {
 294   reass->cached_buffers = NULL;
 295   reass->is_complete = false;
 296 }
 297
 298 always_inline ip6_sv_reass_t *
 299 ip6_sv_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
 300                              ip6_sv_reass_main_t * rm,
 301                              ip6_sv_reass_per_thread_t * rt,
 302                              ip6_sv_reass_kv_t * kv, u32 * icmp_bi,
 303                              u8 * do_handoff)
 304 {
 305   ip6_sv_reass_t *reass = NULL;
 306   f64 now = vlib_time_now (rm->vlib_main);
 307
 308   if (!clib_bihash_search_48_8
 309       (&rm->hash, (clib_bihash_kv_48_8_t *) kv, (clib_bihash_kv_48_8_t *) kv))
 310     {
 311       if (vm->thread_index != kv->v.thread_index)
 312         {
 313           *do_handoff = 1;
 314           return NULL;
 315         }
 316       reass = pool_elt_at_index (rt->pool, kv->v.reass_index);
 317
 318       if (now > reass->last_heard + rm->timeout)
 319         {
 320           ip6_sv_reass_free (vm, rm, rt, reass);
 321           reass = NULL;
 322         }
 323     }
 324
 325   if (reass)
 326     {
 327       reass->last_heard = now;
 328       return reass;
 329     }
 330
 331   if (rt->reass_n >= rm->max_reass_n)
 332     {
 333       reass = pool_elt_at_index (rt->pool, rt->lru_last);
 334       ip6_sv_reass_free (vm, rm, rt, reass);
 335     }
 336
 337   pool_get (rt->pool, reass);
 338   clib_memset (reass, 0, sizeof (*reass));
 339   reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 340   ++rt->id_counter;
 341   ip6_sv_reass_init (reass);
 342   ++rt->reass_n;
 343
 344   reass->lru_prev = reass->lru_next = ~0;
 345
 346   if (~0 != rt->lru_last)
 347     {
 348       ip6_sv_reass_t *lru_last = pool_elt_at_index (rt->pool, rt->lru_last);
 349       reass->lru_prev = rt->lru_last;
 350       lru_last->lru_next = rt->lru_last = reass - rt->pool;
 351     }
 352
 353   if (~0 == rt->lru_first)
 354     {
 355       rt->lru_first = rt->lru_last = reass - rt->pool;
 356     }
 357
 358   reass->key.as_u64[0] = ((clib_bihash_kv_48_8_t *) kv)->key[0];
 359   reass->key.as_u64[1] = ((clib_bihash_kv_48_8_t *) kv)->key[1];
 360   reass->key.as_u64[2] = ((clib_bihash_kv_48_8_t *) kv)->key[2];
 361   reass->key.as_u64[3] = ((clib_bihash_kv_48_8_t *) kv)->key[3];
 362   reass->key.as_u64[4] = ((clib_bihash_kv_48_8_t *) kv)->key[4];
 363   reass->key.as_u64[5] = ((clib_bihash_kv_48_8_t *) kv)->key[5];
 364   kv->v.reass_index = (reass - rt->pool);
 365   kv->v.thread_index = vm->thread_index;
 366   reass->last_heard = now;
 367
 368   if (clib_bihash_add_del_48_8 (&rm->hash, (clib_bihash_kv_48_8_t *) kv, 1))
 369     {
 370       ip6_sv_reass_free (vm, rm, rt, reass);
 371       reass = NULL;
 372     }
 373
 374   return reass;
 375 }
 376
 377 always_inline ip6_sv_reass_rc_t
 378 ip6_sv_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 379                      ip6_sv_reass_main_t * rm, ip6_sv_reass_per_thread_t * rt,
 380                      ip6_sv_reass_t * reass, u32 bi0,
 381                      ip6_frag_hdr_t * frag_hdr)
 382 {
 383   vlib_buffer_t *fb = vlib_get_buffer (vm, bi0);
 384   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 385   fvnb->ip.reass.ip6_frag_hdr_offset =
 386     (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
 387   ip6_header_t *fip = vlib_buffer_get_current (fb);
 388   if (fb->current_length < sizeof (*fip) ||
 389       fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
 390       fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
 391     {
 392       return IP6_SV_REASS_RC_INTERNAL_ERROR;
 393     }
 394
 395   u32 fragment_first = fvnb->ip.reass.fragment_first =
 396     ip6_frag_hdr_offset_bytes (frag_hdr);
 397   u32 fragment_length =
 398     vlib_buffer_length_in_chain (vm, fb) -
 399     (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 400   u32 fragment_last = fvnb->ip.reass.fragment_last =
 401     fragment_first + fragment_length - 1;
 402   fvnb->ip.reass.range_first = fragment_first;
 403   fvnb->ip.reass.range_last = fragment_last;
 404   fvnb->ip.reass.next_range_bi = ~0;
 405   if (0 == fragment_first)
 406     {
 407       if (!ip6_get_port
 408           (vm, fb, fip, fb->current_length, &reass->ip_proto,
 409            &reass->l4_src_port, &reass->l4_dst_port,
 410            &reass->icmp_type_or_tcp_flags, &reass->tcp_ack_number,
 411            &reass->tcp_seq_number))
 412         return IP6_SV_REASS_RC_UNSUPP_IP_PROTO;
 413
 414       reass->is_complete = true;
 415       vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
 416       if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 417         {
 418           ip6_sv_reass_add_trace (vm, node, rm, reass, bi0, REASS_FINISH,
 419                                   reass->ip_proto, reass->l4_src_port,
 420                                   reass->l4_dst_port);
 421         }
 422     }
 423   vec_add1 (reass->cached_buffers, bi0);
 424   if (!reass->is_complete)
 425     {
 426       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 427         {
 428           ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
 429                                   REASS_FRAGMENT_CACHE, reass->ip_proto,
 430                                   reass->l4_src_port, reass->l4_dst_port);
 431         }
 432       if (vec_len (reass->cached_buffers) > rm->max_reass_len)
 433         {
 434           return IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS;
 435         }
 436     }
 437   return IP6_SV_REASS_RC_OK;
 438 }
 439
 440 always_inline bool
 441 ip6_sv_reass_verify_upper_layer_present (vlib_node_runtime_t * node,
 442                                          vlib_buffer_t * b,
 443                                          ip6_frag_hdr_t * frag_hdr)
 444 {
 445   ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr;
 446   while (ip6_ext_hdr (tmp->next_hdr))
 447     {
 448       tmp = ip6_ext_next_header (tmp);
 449     }
 450   if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr)
 451     {
 452       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 453                                    ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
 454                                    0);
 455       b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
 456
 457       return false;
 458     }
 459   return true;
 460 }
 461
 462 always_inline bool
 463 ip6_sv_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
 464                                          vlib_node_runtime_t * node,
 465                                          vlib_buffer_t * b,
 466                                          ip6_frag_hdr_t * frag_hdr)
 467 {
 468   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 469   ip6_header_t *ip = vlib_buffer_get_current (b);
 470   int more_fragments = ip6_frag_hdr_more (frag_hdr);
 471   u32 fragment_length =
 472     vlib_buffer_length_in_chain (vm, b) -
 473     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 474   if (more_fragments && 0 != fragment_length % 8)
 475     {
 476       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 477                                    ICMP6_parameter_problem_erroneous_header_field,
 478                                    (u8 *) & ip->payload_length - (u8 *) ip);
 479       return false;
 480     }
 481   return true;
 482 }
 483
 484 always_inline bool
 485 ip6_sv_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
 486                                         vlib_node_runtime_t * node,
 487                                         vlib_buffer_t * b,
 488                                         ip6_frag_hdr_t * frag_hdr)
 489 {
 490   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 491   u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
 492   u32 fragment_length =
 493     vlib_buffer_length_in_chain (vm, b) -
 494     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 495   if (fragment_first + fragment_length > 65535)
 496     {
 497       ip6_header_t *ip0 = vlib_buffer_get_current (b);
 498       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 499                                    ICMP6_parameter_problem_erroneous_header_field,
 500                                    (u8 *) & frag_hdr->fragment_offset_and_more
 501                                    - (u8 *) ip0);
 502       return false;
 503     }
 504   return true;
 505 }
 506
 507 always_inline uword
 508 ip6_sv_reassembly_inline (vlib_main_t * vm,
 509                           vlib_node_runtime_t * node,
 510                           vlib_frame_t * frame, bool is_feature)
 511 {
 512   u32 *from = vlib_frame_vector_args (frame);
 513   u32 n_left_from, n_left_to_next, *to_next, next_index;
 514   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 515   ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
 516   clib_spinlock_lock (&rt->lock);
 517
 518   n_left_from = frame->n_vectors;
 519   next_index = node->cached_next_index;
 520
 521   while (n_left_from > 0)
 522     {
 523       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 524
 525       while (n_left_from > 0 && n_left_to_next > 0)
 526         {
 527           u32 bi0;
 528           vlib_buffer_t *b0;
 529           u32 next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 530           u32 error0 = IP6_ERROR_NONE;
 531           u32 icmp_bi = ~0;
 532
 533           bi0 = from[0];
 534           b0 = vlib_get_buffer (vm, bi0);
 535
 536           ip6_header_t *ip0 = vlib_buffer_get_current (b0);
 537           ip6_frag_hdr_t *frag_hdr = NULL;
 538           ip6_ext_header_t *prev_hdr;
 539           if (ip6_ext_hdr (ip0->protocol))
 540             {
 541               frag_hdr =
 542                 ip6_ext_header_find (vm, b0, ip0,
 543                                      IP_PROTOCOL_IPV6_FRAGMENTATION,
 544                                      &prev_hdr);
 545             }
 546           if (!frag_hdr)
 547             {
 548               // this is a regular packet - no fragmentation
 549               if (!ip6_get_port
 550                   (vm, b0, ip0, b0->current_length,
 551                    &(vnet_buffer (b0)->ip.reass.ip_proto),
 552                    &(vnet_buffer (b0)->ip.reass.l4_src_port),
 553                    &(vnet_buffer (b0)->ip.reass.l4_dst_port),
 554                    &(vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags),
 555                    &(vnet_buffer (b0)->ip.reass.tcp_ack_number),
 556                    &(vnet_buffer (b0)->ip.reass.tcp_seq_number)))
 557                 {
 558                   error0 = IP6_ERROR_REASS_UNSUPP_IP_PROTO;
 559                   next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 560                   goto packet_enqueue;
 561                 }
 562               ASSERT (vnet_buffer (b0)->ip.save_rewrite_length < (2 << 14));
 563               vnet_buffer (b0)->ip.reass.save_rewrite_length =
 564                 vnet_buffer (b0)->ip.save_rewrite_length;
 565               vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
 566               next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
 567               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 568                 {
 569                   ip6_sv_reass_add_trace (vm, node, rm, NULL, bi0,
 570                                           REASS_PASSTHROUGH,
 571                                           vnet_buffer (b0)->ip.reass.ip_proto,
 572                                           vnet_buffer (b0)->ip.
 573                                           reass.l4_src_port,
 574                                           vnet_buffer (b0)->ip.
 575                                           reass.l4_dst_port);
 576                 }
 577               goto packet_enqueue;
 578             }
 579           vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
 580             (u8 *) frag_hdr - (u8 *) ip0;
 581           if (0 == ip6_frag_hdr_offset (frag_hdr))
 582             {
 583               // first fragment - verify upper-layer is present
 584               if (!ip6_sv_reass_verify_upper_layer_present
 585                   (node, b0, frag_hdr))
 586                 {
 587                   next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 588                   goto packet_enqueue;
 589                 }
 590             }
 591           if (!ip6_sv_reass_verify_fragment_multiple_8
 592               (vm, node, b0, frag_hdr)
 593               || !ip6_sv_reass_verify_packet_size_lt_64k (vm, node, b0,
 594                                                           frag_hdr))
 595             {
 596               next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 597               goto packet_enqueue;
 598             }
 599
 600           ip6_sv_reass_kv_t kv;
 601           u8 do_handoff = 0;
 602
 603           kv.k.as_u64[0] = ip0->src_address.as_u64[0];
 604           kv.k.as_u64[1] = ip0->src_address.as_u64[1];
 605           kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
 606           kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
 607           kv.k.as_u64[4] =
 608             ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
 609                             vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
 610             (u64) frag_hdr->identification;
 611           kv.k.as_u64[5] = ip0->protocol;
 612
 613           ip6_sv_reass_t *reass =
 614             ip6_sv_reass_find_or_create (vm, node, rm, rt, &kv, &icmp_bi,
 615                                          &do_handoff);
 616
 617           if (PREDICT_FALSE (do_handoff))
 618             {
 619               next0 = IP6_SV_REASSEMBLY_NEXT_HANDOFF;
 620               vnet_buffer (b0)->ip.reass.owner_thread_index =
 621                 kv.v.thread_index;
 622               goto packet_enqueue;
 623             }
 624
 625           if (!reass)
 626             {
 627               next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 628               error0 = IP6_ERROR_REASS_LIMIT_REACHED;
 629               goto packet_enqueue;
 630             }
 631
 632           if (reass->is_complete)
 633             {
 634               ASSERT (vnet_buffer (b0)->ip.save_rewrite_length < (2 << 14));
 635               vnet_buffer (b0)->ip.reass.save_rewrite_length =
 636                 vnet_buffer (b0)->ip.save_rewrite_length;
 637               vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 638                 ! !ip6_frag_hdr_offset (frag_hdr);
 639               vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 640               vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 641                 reass->icmp_type_or_tcp_flags;
 642               vnet_buffer (b0)->ip.reass.tcp_ack_number =
 643                 reass->tcp_ack_number;
 644               vnet_buffer (b0)->ip.reass.tcp_seq_number =
 645                 reass->tcp_seq_number;
 646               vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 647               vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 648               next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
 649               error0 = IP6_ERROR_NONE;
 650               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 651                 {
 652                   ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
 653                                           REASS_FRAGMENT_FORWARD,
 654                                           reass->ip_proto,
 655                                           reass->l4_src_port,
 656                                           reass->l4_dst_port);
 657                 }
 658               goto packet_enqueue;
 659             }
 660
 661           switch (ip6_sv_reass_update
 662                   (vm, node, rm, rt, reass, bi0, frag_hdr))
 663             {
 664             case IP6_SV_REASS_RC_OK:
 665               /* nothing to do here */
 666               break;
 667             case IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS:
 668               vlib_node_increment_counter (vm, node->node_index,
 669                                            IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
 670                                            1);
 671               ip6_sv_reass_free (vm, rm, rt, reass);
 672               goto next_packet;
 673               break;
 674             case IP6_SV_REASS_RC_UNSUPP_IP_PROTO:
 675               vlib_node_increment_counter (vm, node->node_index,
 676                                            IP6_ERROR_REASS_UNSUPP_IP_PROTO,
 677                                            1);
 678               ip6_sv_reass_free (vm, rm, rt, reass);
 679               goto next_packet;
 680               break;
 681             case IP6_SV_REASS_RC_INTERNAL_ERROR:
 682               vlib_node_increment_counter (vm, node->node_index,
 683                                            IP6_ERROR_REASS_INTERNAL_ERROR, 1);
 684               ip6_sv_reass_free (vm, rm, rt, reass);
 685               goto next_packet;
 686               break;
 687             }
 688
 689           b0->error = node->errors[error0];
 690
 691           if (reass->is_complete)
 692             {
 693               u32 idx;
 694               vec_foreach_index (idx, reass->cached_buffers)
 695               {
 696                 u32 bi0 = vec_elt (reass->cached_buffers, idx);
 697                 if (0 == n_left_to_next)
 698                   {
 699                     vlib_put_next_frame (vm, node, next_index,
 700                                          n_left_to_next);
 701                     vlib_get_next_frame (vm, node, next_index, to_next,
 702                                          n_left_to_next);
 703                   }
 704                 to_next[0] = bi0;
 705                 to_next += 1;
 706                 n_left_to_next -= 1;
 707                 b0 = vlib_get_buffer (vm, bi0);
 708                 if (is_feature)
 709                   {
 710                     vnet_feature_next (&next0, b0);
 711                   }
 712                 frag_hdr =
 713                   vlib_buffer_get_current (b0) +
 714                   vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset;
 715                 ASSERT (vnet_buffer (b0)->ip.save_rewrite_length < (2 << 14));
 716                 vnet_buffer (b0)->ip.reass.save_rewrite_length =
 717                   vnet_buffer (b0)->ip.save_rewrite_length;
 718                 vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 719                   ! !ip6_frag_hdr_offset (frag_hdr);
 720                 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 721                 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 722                   reass->icmp_type_or_tcp_flags;
 723                 vnet_buffer (b0)->ip.reass.tcp_ack_number =
 724                   reass->tcp_ack_number;
 725                 vnet_buffer (b0)->ip.reass.tcp_seq_number =
 726                   reass->tcp_seq_number;
 727                 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 728                 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 729                 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 730                   {
 731                     ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
 732                                             REASS_FRAGMENT_FORWARD,
 733                                             reass->ip_proto,
 734                                             reass->l4_src_port,
 735                                             reass->l4_dst_port);
 736                   }
 737                 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 738                                                  to_next, n_left_to_next, bi0,
 739                                                  next0);
 740               }
 741               _vec_len (reass->cached_buffers) = 0;     // buffers are owned by frame now
 742             }
 743           goto next_packet;
 744
 745         packet_enqueue:
 746           to_next[0] = bi0;
 747           to_next += 1;
 748           n_left_to_next -= 1;
 749           if (is_feature && IP6_ERROR_NONE == error0)
 750             {
 751               b0 = vlib_get_buffer (vm, bi0);
 752               vnet_feature_next (&next0, b0);
 753             }
 754           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 755                                            n_left_to_next, bi0, next0);
 756
 757           if (~0 != icmp_bi)
 758             {
 759               next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 760               to_next[0] = icmp_bi;
 761               to_next += 1;
 762               n_left_to_next -= 1;
 763               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 764                                                n_left_to_next, icmp_bi,
 765                                                next0);
 766             }
 767
 768         next_packet:
 769           from += 1;
 770           n_left_from -= 1;
 771         }
 772
 773       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 774     }
 775
 776   clib_spinlock_unlock (&rt->lock);
 777   return frame->n_vectors;
 778 }
 779
 780 static char *ip6_sv_reassembly_error_strings[] = {
 781 #define _(sym, string) string,
 782   foreach_ip6_error
 783 #undef _
 784 };
 785
 786 VLIB_NODE_FN (ip6_sv_reass_node) (vlib_main_t * vm,
 787                                   vlib_node_runtime_t * node,
 788                                   vlib_frame_t * frame)
 789 {
 790   return ip6_sv_reassembly_inline (vm, node, frame, false /* is_feature */ );
 791 }
 792
 793 /* *INDENT-OFF* */
 794 VLIB_REGISTER_NODE (ip6_sv_reass_node) = {
 795     .name = "ip6-sv-reassembly",
 796     .vector_size = sizeof (u32),
 797     .format_trace = format_ip6_sv_reass_trace,
 798     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
 799     .error_strings = ip6_sv_reassembly_error_strings,
 800     .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
 801     .next_nodes =
 802         {
 803                 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
 804                 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
 805                 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
 806                 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reassembly-handoff",
 807         },
 808 };
 809 /* *INDENT-ON* */
 810
 811 VLIB_NODE_FN (ip6_sv_reass_node_feature) (vlib_main_t * vm,
 812                                           vlib_node_runtime_t * node,
 813                                           vlib_frame_t * frame)
 814 {
 815   return ip6_sv_reassembly_inline (vm, node, frame, true /* is_feature */ );
 816 }
 817
 818 /* *INDENT-OFF* */
 819 VLIB_REGISTER_NODE (ip6_sv_reass_node_feature) = {
 820     .name = "ip6-sv-reassembly-feature",
 821     .vector_size = sizeof (u32),
 822     .format_trace = format_ip6_sv_reass_trace,
 823     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
 824     .error_strings = ip6_sv_reassembly_error_strings,
 825     .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
 826     .next_nodes =
 827         {
 828                 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
 829                 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
 830                 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
 831                 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reass-feature-hoff",
 832         },
 833 };
 834 /* *INDENT-ON* */
 835
 836 /* *INDENT-OFF* */
 837 VNET_FEATURE_INIT (ip6_sv_reassembly_feature) = {
 838     .arc_name = "ip6-unicast",
 839     .node_name = "ip6-sv-reassembly-feature",
 840     .runs_before = VNET_FEATURES ("ip6-lookup"),
 841     .runs_after = 0,
 842 };
 843 /* *INDENT-ON* */
 844
 845 #ifndef CLIB_MARCH_VARIANT
 846 static u32
 847 ip6_sv_reass_get_nbuckets ()
 848 {
 849   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 850   u32 nbuckets;
 851   u8 i;
 852
 853   nbuckets = (u32) (rm->max_reass_n / IP6_SV_REASS_HT_LOAD_FACTOR);
 854
 855   for (i = 0; i < 31; i++)
 856     if ((1 << i) >= nbuckets)
 857       break;
 858   nbuckets = 1 << i;
 859
 860   return nbuckets;
 861 }
 862 #endif /* CLIB_MARCH_VARIANT */
 863
 864 typedef enum
 865 {
 866   IP6_EVENT_CONFIG_CHANGED = 1,
 867 } ip6_sv_reass_event_t;
 868
 869 #ifndef CLIB_MARCH_VARIANT
 870 typedef struct
 871 {
 872   int failure;
 873   clib_bihash_48_8_t *new_hash;
 874 } ip6_rehash_cb_ctx;
 875
 876 static int
 877 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
 878 {
 879   ip6_rehash_cb_ctx *ctx = _ctx;
 880   if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
 881     {
 882       ctx->failure = 1;
 883     }
 884   return (BIHASH_WALK_CONTINUE);
 885 }
 886
 887 static void
 888 ip6_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
 889                          u32 max_reassembly_length,
 890                          u32 expire_walk_interval_ms)
 891 {
 892   ip6_sv_reass_main.timeout_ms = timeout_ms;
 893   ip6_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
 894   ip6_sv_reass_main.max_reass_n = max_reassemblies;
 895   ip6_sv_reass_main.max_reass_len = max_reassembly_length;
 896   ip6_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
 897 }
 898
 899 vnet_api_error_t
 900 ip6_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
 901                   u32 max_reassembly_length, u32 expire_walk_interval_ms)
 902 {
 903   u32 old_nbuckets = ip6_sv_reass_get_nbuckets ();
 904   ip6_sv_reass_set_params (timeout_ms, max_reassemblies,
 905                            max_reassembly_length, expire_walk_interval_ms);
 906   vlib_process_signal_event (ip6_sv_reass_main.vlib_main,
 907                              ip6_sv_reass_main.ip6_sv_reass_expire_node_idx,
 908                              IP6_EVENT_CONFIG_CHANGED, 0);
 909   u32 new_nbuckets = ip6_sv_reass_get_nbuckets ();
 910   if (ip6_sv_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
 911     {
 912       clib_bihash_48_8_t new_hash;
 913       clib_memset (&new_hash, 0, sizeof (new_hash));
 914       ip6_rehash_cb_ctx ctx;
 915       ctx.failure = 0;
 916       ctx.new_hash = &new_hash;
 917       clib_bihash_init_48_8 (&new_hash, "ip6-sv-reass", new_nbuckets,
 918                              new_nbuckets * 1024);
 919       clib_bihash_foreach_key_value_pair_48_8 (&ip6_sv_reass_main.hash,
 920                                                ip6_rehash_cb, &ctx);
 921       if (ctx.failure)
 922         {
 923           clib_bihash_free_48_8 (&new_hash);
 924           return -1;
 925         }
 926       else
 927         {
 928           clib_bihash_free_48_8 (&ip6_sv_reass_main.hash);
 929           clib_memcpy_fast (&ip6_sv_reass_main.hash, &new_hash,
 930                             sizeof (ip6_sv_reass_main.hash));
 931           clib_bihash_copied (&ip6_sv_reass_main.hash, &new_hash);
 932         }
 933     }
 934   return 0;
 935 }
 936
 937 vnet_api_error_t
 938 ip6_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
 939                   u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
 940 {
 941   *timeout_ms = ip6_sv_reass_main.timeout_ms;
 942   *max_reassemblies = ip6_sv_reass_main.max_reass_n;
 943   *max_reassembly_length = ip6_sv_reass_main.max_reass_len;
 944   *expire_walk_interval_ms = ip6_sv_reass_main.expire_walk_interval_ms;
 945   return 0;
 946 }
 947
 948 static clib_error_t *
 949 ip6_sv_reass_init_function (vlib_main_t * vm)
 950 {
 951   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 952   clib_error_t *error = 0;
 953   u32 nbuckets;
 954   vlib_node_t *node;
 955
 956   rm->vlib_main = vm;
 957   rm->vnet_main = vnet_get_main ();
 958
 959   vec_validate (rm->per_thread_data, vlib_num_workers ());
 960   ip6_sv_reass_per_thread_t *rt;
 961   vec_foreach (rt, rm->per_thread_data)
 962   {
 963     clib_spinlock_init (&rt->lock);
 964     pool_alloc (rt->pool, rm->max_reass_n);
 965     rt->lru_first = rt->lru_last = ~0;
 966   }
 967
 968   node = vlib_get_node_by_name (vm, (u8 *) "ip6-sv-reassembly-expire-walk");
 969   ASSERT (node);
 970   rm->ip6_sv_reass_expire_node_idx = node->index;
 971
 972   ip6_sv_reass_set_params (IP6_SV_REASS_TIMEOUT_DEFAULT_MS,
 973                            IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
 974                            IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
 975                            IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
 976
 977   nbuckets = ip6_sv_reass_get_nbuckets ();
 978   clib_bihash_init_48_8 (&rm->hash, "ip6-sv-reass", nbuckets,
 979                          nbuckets * 1024);
 980
 981   node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
 982   ASSERT (node);
 983   rm->ip6_drop_idx = node->index;
 984   node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
 985   ASSERT (node);
 986   rm->ip6_icmp_error_idx = node->index;
 987
 988   if ((error = vlib_call_init_function (vm, ip_main_init)))
 989     return error;
 990   ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
 991                          ip6_sv_reass_node.index);
 992
 993   rm->fq_index = vlib_frame_queue_main_init (ip6_sv_reass_node.index, 0);
 994   rm->fq_feature_index =
 995     vlib_frame_queue_main_init (ip6_sv_reass_node_feature.index, 0);
 996
 997   rm->feature_use_refcount_per_intf = NULL;
 998
 999   return error;
1000 }
1001
1002 VLIB_INIT_FUNCTION (ip6_sv_reass_init_function);
1003 #endif /* CLIB_MARCH_VARIANT */
1004
1005 static uword
1006 ip6_sv_reass_walk_expired (vlib_main_t * vm,
1007                            vlib_node_runtime_t * node, vlib_frame_t * f)
1008 {
1009   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1010   uword event_type, *event_data = 0;
1011
1012   while (true)
1013     {
1014       vlib_process_wait_for_event_or_clock (vm,
1015                                             (f64) rm->expire_walk_interval_ms
1016                                             / (f64) MSEC_PER_SEC);
1017       event_type = vlib_process_get_events (vm, &event_data);
1018
1019       switch (event_type)
1020         {
1021         case ~0:                /* no events => timeout */
1022           /* nothing to do here */
1023           break;
1024         case IP6_EVENT_CONFIG_CHANGED:
1025           break;
1026         default:
1027           clib_warning ("BUG: event type 0x%wx", event_type);
1028           break;
1029         }
1030       f64 now = vlib_time_now (vm);
1031
1032       ip6_sv_reass_t *reass;
1033       int *pool_indexes_to_free = NULL;
1034
1035       uword thread_index = 0;
1036       int index;
1037       const uword nthreads = vlib_num_workers () + 1;
1038       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1039         {
1040           ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1041           clib_spinlock_lock (&rt->lock);
1042
1043           vec_reset_length (pool_indexes_to_free);
1044           /* *INDENT-OFF* */
1045           pool_foreach_index (index, rt->pool, ({
1046                                 reass = pool_elt_at_index (rt->pool, index);
1047                                 if (now > reass->last_heard + rm->timeout)
1048                                   {
1049                                     vec_add1 (pool_indexes_to_free, index);
1050                                   }
1051                               }));
1052           /* *INDENT-ON* */
1053           int *i;
1054           /* *INDENT-OFF* */
1055           vec_foreach (i, pool_indexes_to_free)
1056           {
1057             ip6_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1058             ip6_sv_reass_free (vm, rm, rt, reass);
1059           }
1060           /* *INDENT-ON* */
1061
1062           clib_spinlock_unlock (&rt->lock);
1063         }
1064
1065       vec_free (pool_indexes_to_free);
1066       if (event_data)
1067         {
1068           _vec_len (event_data) = 0;
1069         }
1070     }
1071
1072   return 0;
1073 }
1074
1075 /* *INDENT-OFF* */
1076 VLIB_REGISTER_NODE (ip6_sv_reass_expire_node) = {
1077     .function = ip6_sv_reass_walk_expired,
1078     .format_trace = format_ip6_sv_reass_trace,
1079     .type = VLIB_NODE_TYPE_PROCESS,
1080     .name = "ip6-sv-reassembly-expire-walk",
1081
1082     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
1083     .error_strings = ip6_sv_reassembly_error_strings,
1084
1085 };
1086 /* *INDENT-ON* */
1087
1088 static u8 *
1089 format_ip6_sv_reass_key (u8 * s, va_list * args)
1090 {
1091   ip6_sv_reass_key_t *key = va_arg (*args, ip6_sv_reass_key_t *);
1092   s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1093               key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1094               &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1095   return s;
1096 }
1097
1098 static u8 *
1099 format_ip6_sv_reass (u8 * s, va_list * args)
1100 {
1101   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1102   ip6_sv_reass_t *reass = va_arg (*args, ip6_sv_reass_t *);
1103
1104   s = format (s, "ID: %lu, key: %U, trace_op_counter: %u\n",
1105               reass->id, format_ip6_sv_reass_key, &reass->key,
1106               reass->trace_op_counter);
1107   vlib_buffer_t *b;
1108   u32 *bip;
1109   u32 counter = 0;
1110   vec_foreach (bip, reass->cached_buffers)
1111   {
1112     u32 bi = *bip;
1113     do
1114       {
1115         b = vlib_get_buffer (vm, bi);
1116         s = format (s, "  #%03u: bi: %u\n", counter, bi);
1117         ++counter;
1118         bi = b->next_buffer;
1119       }
1120     while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1121   }
1122   return s;
1123 }
1124
1125 static clib_error_t *
1126 show_ip6_sv_reass (vlib_main_t * vm, unformat_input_t * input,
1127                    CLIB_UNUSED (vlib_cli_command_t * lmd))
1128 {
1129   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1130
1131   vlib_cli_output (vm, "---------------------");
1132   vlib_cli_output (vm, "IP6 reassembly status");
1133   vlib_cli_output (vm, "---------------------");
1134   bool details = false;
1135   if (unformat (input, "details"))
1136     {
1137       details = true;
1138     }
1139
1140   u32 sum_reass_n = 0;
1141   u64 sum_buffers_n = 0;
1142   ip6_sv_reass_t *reass;
1143   uword thread_index;
1144   const uword nthreads = vlib_num_workers () + 1;
1145   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1146     {
1147       ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1148       clib_spinlock_lock (&rt->lock);
1149       if (details)
1150         {
1151           /* *INDENT-OFF* */
1152           pool_foreach (reass, rt->pool, {
1153             vlib_cli_output (vm, "%U", format_ip6_sv_reass, vm, reass);
1154           });
1155           /* *INDENT-ON* */
1156         }
1157       sum_reass_n += rt->reass_n;
1158       clib_spinlock_unlock (&rt->lock);
1159     }
1160   vlib_cli_output (vm, "---------------------");
1161   vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1162                    (long unsigned) sum_reass_n);
1163   vlib_cli_output (vm, "Maximum configured concurrent IP6 reassemblies per "
1164                    "worker-thread: %lu\n", (long unsigned) rm->max_reass_n);
1165   vlib_cli_output (vm, "Buffers in use: %lu\n",
1166                    (long unsigned) sum_buffers_n);
1167   return 0;
1168 }
1169
1170 /* *INDENT-OFF* */
1171 VLIB_CLI_COMMAND (show_ip6_sv_reassembly_cmd, static) = {
1172     .path = "show ip6-sv-reassembly",
1173     .short_help = "show ip6-sv-reassembly [details]",
1174     .function = show_ip6_sv_reass,
1175 };
1176 /* *INDENT-ON* */
1177
1178 #ifndef CLIB_MARCH_VARIANT
1179 vnet_api_error_t
1180 ip6_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1181 {
1182   return ip6_sv_reass_enable_disable_with_refcnt (sw_if_index,
1183                                                   enable_disable);
1184 }
1185 #endif /* CLIB_MARCH_VARIANT */
1186
1187 #define foreach_ip6_sv_reassembly_handoff_error                       \
1188 _(CONGESTION_DROP, "congestion drop")
1189
1190
1191 typedef enum
1192 {
1193 #define _(sym,str) IP6_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
1194   foreach_ip6_sv_reassembly_handoff_error
1195 #undef _
1196     IP6_SV_REASSEMBLY_HANDOFF_N_ERROR,
1197 } ip6_sv_reassembly_handoff_error_t;
1198
1199 static char *ip6_sv_reassembly_handoff_error_strings[] = {
1200 #define _(sym,string) string,
1201   foreach_ip6_sv_reassembly_handoff_error
1202 #undef _
1203 };
1204
1205 typedef struct
1206 {
1207   u32 next_worker_index;
1208 } ip6_sv_reassembly_handoff_trace_t;
1209
1210 static u8 *
1211 format_ip6_sv_reassembly_handoff_trace (u8 * s, va_list * args)
1212 {
1213   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1214   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1215   ip6_sv_reassembly_handoff_trace_t *t =
1216     va_arg (*args, ip6_sv_reassembly_handoff_trace_t *);
1217
1218   s =
1219     format (s, "ip6-sv-reassembly-handoff: next-worker %d",
1220             t->next_worker_index);
1221
1222   return s;
1223 }
1224
1225 always_inline uword
1226 ip6_sv_reassembly_handoff_inline (vlib_main_t * vm,
1227                                   vlib_node_runtime_t * node,
1228                                   vlib_frame_t * frame, bool is_feature)
1229 {
1230   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1231
1232   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1233   u32 n_enq, n_left_from, *from;
1234   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1235   u32 fq_index;
1236
1237   from = vlib_frame_vector_args (frame);
1238   n_left_from = frame->n_vectors;
1239   vlib_get_buffers (vm, from, bufs, n_left_from);
1240
1241   b = bufs;
1242   ti = thread_indices;
1243
1244   fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1245
1246   while (n_left_from > 0)
1247     {
1248       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1249
1250       if (PREDICT_FALSE
1251           ((node->flags & VLIB_NODE_FLAG_TRACE)
1252            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1253         {
1254           ip6_sv_reassembly_handoff_trace_t *t =
1255             vlib_add_trace (vm, node, b[0], sizeof (*t));
1256           t->next_worker_index = ti[0];
1257         }
1258
1259       n_left_from -= 1;
1260       ti += 1;
1261       b += 1;
1262     }
1263   n_enq =
1264     vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1265                                    frame->n_vectors, 1);
1266
1267   if (n_enq < frame->n_vectors)
1268     vlib_node_increment_counter (vm, node->node_index,
1269                                  IP6_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1270                                  frame->n_vectors - n_enq);
1271   return frame->n_vectors;
1272 }
1273
1274 VLIB_NODE_FN (ip6_sv_reassembly_handoff_node) (vlib_main_t * vm,
1275                                                vlib_node_runtime_t * node,
1276                                                vlib_frame_t * frame)
1277 {
1278   return ip6_sv_reassembly_handoff_inline (vm, node, frame,
1279                                            false /* is_feature */ );
1280 }
1281
1282 /* *INDENT-OFF* */
1283 VLIB_REGISTER_NODE (ip6_sv_reassembly_handoff_node) = {
1284   .name = "ip6-sv-reassembly-handoff",
1285   .vector_size = sizeof (u32),
1286   .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1287   .error_strings = ip6_sv_reassembly_handoff_error_strings,
1288   .format_trace = format_ip6_sv_reassembly_handoff_trace,
1289
1290   .n_next_nodes = 1,
1291
1292   .next_nodes = {
1293     [0] = "error-drop",
1294   },
1295 };
1296
1297
1298 VLIB_NODE_FN (ip6_sv_reassembly_feature_handoff_node) (vlib_main_t * vm,
1299                                vlib_node_runtime_t * node, vlib_frame_t * frame)
1300 {
1301   return ip6_sv_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1302 }
1303
1304
1305 /* *INDENT-OFF* */
1306 VLIB_REGISTER_NODE (ip6_sv_reassembly_feature_handoff_node) = {
1307   .name = "ip6-sv-reass-feature-hoff",
1308   .vector_size = sizeof (u32),
1309   .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1310   .error_strings = ip6_sv_reassembly_handoff_error_strings,
1311   .format_trace = format_ip6_sv_reassembly_handoff_trace,
1312
1313   .n_next_nodes = 1,
1314
1315   .next_nodes = {
1316     [0] = "error-drop",
1317   },
1318 };
1319 /* *INDENT-ON* */
1320
1321 #ifndef CLIB_MARCH_VARIANT
1322 int
1323 ip6_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1324 {
1325   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1326   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1327   if (is_enable)
1328     {
1329       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1330         {
1331           ++rm->feature_use_refcount_per_intf[sw_if_index];
1332           return vnet_feature_enable_disable ("ip6-unicast",
1333                                               "ip6-sv-reassembly-feature",
1334                                               sw_if_index, 1, 0, 0);
1335         }
1336       ++rm->feature_use_refcount_per_intf[sw_if_index];
1337     }
1338   else
1339     {
1340       --rm->feature_use_refcount_per_intf[sw_if_index];
1341       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1342         return vnet_feature_enable_disable ("ip6-unicast",
1343                                             "ip6-sv-reassembly-feature",
1344                                             sw_if_index, 0, 0, 0);
1345     }
1346   return 0;
1347 }
1348 #endif
1349
1350 /*
1351  * fd.io coding-style-patch-verification: ON
1352  *
1353  * Local Variables:
1354  * eval: (c-set-style "gnu")
1355  * End:
1356  */