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                   b0->error = node->errors[error0];
 560                   next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 561                   goto packet_enqueue;
 562                 }
 563               vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
 564               next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
 565               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 566                 {
 567                   ip6_sv_reass_add_trace (vm, node, rm, NULL, bi0,
 568                                           REASS_PASSTHROUGH,
 569                                           vnet_buffer (b0)->ip.reass.ip_proto,
 570                                           vnet_buffer (b0)->ip.
 571                                           reass.l4_src_port,
 572                                           vnet_buffer (b0)->ip.
 573                                           reass.l4_dst_port);
 574                 }
 575               goto packet_enqueue;
 576             }
 577           vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
 578             (u8 *) frag_hdr - (u8 *) ip0;
 579           if (0 == ip6_frag_hdr_offset (frag_hdr))
 580             {
 581               // first fragment - verify upper-layer is present
 582               if (!ip6_sv_reass_verify_upper_layer_present
 583                   (node, b0, frag_hdr))
 584                 {
 585                   next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 586                   goto packet_enqueue;
 587                 }
 588             }
 589           if (!ip6_sv_reass_verify_fragment_multiple_8
 590               (vm, node, b0, frag_hdr)
 591               || !ip6_sv_reass_verify_packet_size_lt_64k (vm, node, b0,
 592                                                           frag_hdr))
 593             {
 594               next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 595               goto packet_enqueue;
 596             }
 597
 598           ip6_sv_reass_kv_t kv;
 599           u8 do_handoff = 0;
 600
 601           kv.k.as_u64[0] = ip0->src_address.as_u64[0];
 602           kv.k.as_u64[1] = ip0->src_address.as_u64[1];
 603           kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
 604           kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
 605           kv.k.as_u64[4] =
 606             ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
 607                             vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
 608             (u64) frag_hdr->identification;
 609           kv.k.as_u64[5] = ip0->protocol;
 610
 611           ip6_sv_reass_t *reass =
 612             ip6_sv_reass_find_or_create (vm, node, rm, rt, &kv, &icmp_bi,
 613                                          &do_handoff);
 614
 615           if (PREDICT_FALSE (do_handoff))
 616             {
 617               next0 = IP6_SV_REASSEMBLY_NEXT_HANDOFF;
 618               vnet_buffer (b0)->ip.reass.owner_thread_index =
 619                 kv.v.thread_index;
 620               goto packet_enqueue;
 621             }
 622
 623           if (!reass)
 624             {
 625               next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
 626               error0 = IP6_ERROR_REASS_LIMIT_REACHED;
 627               b0->error = node->errors[error0];
 628               goto packet_enqueue;
 629             }
 630
 631           if (reass->is_complete)
 632             {
 633               vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 634                 ! !ip6_frag_hdr_offset (frag_hdr);
 635               vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 636               vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 637                 reass->icmp_type_or_tcp_flags;
 638               vnet_buffer (b0)->ip.reass.tcp_ack_number =
 639                 reass->tcp_ack_number;
 640               vnet_buffer (b0)->ip.reass.tcp_seq_number =
 641                 reass->tcp_seq_number;
 642               vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 643               vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 644               next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
 645               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 646                 {
 647                   ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
 648                                           REASS_FRAGMENT_FORWARD,
 649                                           reass->ip_proto,
 650                                           reass->l4_src_port,
 651                                           reass->l4_dst_port);
 652                 }
 653               goto packet_enqueue;
 654             }
 655
 656           switch (ip6_sv_reass_update
 657                   (vm, node, rm, rt, reass, bi0, frag_hdr))
 658             {
 659             case IP6_SV_REASS_RC_OK:
 660               /* nothing to do here */
 661               break;
 662             case IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS:
 663               vlib_node_increment_counter (vm, node->node_index,
 664                                            IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
 665                                            1);
 666               ip6_sv_reass_free (vm, rm, rt, reass);
 667               goto next_packet;
 668               break;
 669             case IP6_SV_REASS_RC_UNSUPP_IP_PROTO:
 670               vlib_node_increment_counter (vm, node->node_index,
 671                                            IP6_ERROR_REASS_UNSUPP_IP_PROTO,
 672                                            1);
 673               ip6_sv_reass_free (vm, rm, rt, reass);
 674               goto next_packet;
 675               break;
 676             case IP6_SV_REASS_RC_INTERNAL_ERROR:
 677               vlib_node_increment_counter (vm, node->node_index,
 678                                            IP6_ERROR_REASS_INTERNAL_ERROR, 1);
 679               ip6_sv_reass_free (vm, rm, rt, reass);
 680               goto next_packet;
 681               break;
 682             }
 683
 684           if (reass->is_complete)
 685             {
 686               u32 idx;
 687               vec_foreach_index (idx, reass->cached_buffers)
 688               {
 689                 u32 bi0 = vec_elt (reass->cached_buffers, idx);
 690                 if (0 == n_left_to_next)
 691                   {
 692                     vlib_put_next_frame (vm, node, next_index,
 693                                          n_left_to_next);
 694                     vlib_get_next_frame (vm, node, next_index, to_next,
 695                                          n_left_to_next);
 696                   }
 697                 to_next[0] = bi0;
 698                 to_next += 1;
 699                 n_left_to_next -= 1;
 700                 b0 = vlib_get_buffer (vm, bi0);
 701                 if (is_feature)
 702                   {
 703                     vnet_feature_next (&next0, b0);
 704                   }
 705                 frag_hdr =
 706                   vlib_buffer_get_current (b0) +
 707                   vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset;
 708                 vnet_buffer (b0)->ip.reass.is_non_first_fragment =
 709                   ! !ip6_frag_hdr_offset (frag_hdr);
 710                 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
 711                 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
 712                   reass->icmp_type_or_tcp_flags;
 713                 vnet_buffer (b0)->ip.reass.tcp_ack_number =
 714                   reass->tcp_ack_number;
 715                 vnet_buffer (b0)->ip.reass.tcp_seq_number =
 716                   reass->tcp_seq_number;
 717                 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
 718                 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
 719                 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 720                   {
 721                     ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
 722                                             REASS_FRAGMENT_FORWARD,
 723                                             reass->ip_proto,
 724                                             reass->l4_src_port,
 725                                             reass->l4_dst_port);
 726                   }
 727                 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 728                                                  to_next, n_left_to_next, bi0,
 729                                                  next0);
 730               }
 731               _vec_len (reass->cached_buffers) = 0;     // buffers are owned by frame now
 732             }
 733           goto next_packet;
 734
 735         packet_enqueue:
 736           to_next[0] = bi0;
 737           to_next += 1;
 738           n_left_to_next -= 1;
 739           if (is_feature && IP6_ERROR_NONE == error0)
 740             {
 741               b0 = vlib_get_buffer (vm, bi0);
 742               vnet_feature_next (&next0, b0);
 743             }
 744           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 745                                            n_left_to_next, bi0, next0);
 746
 747           if (~0 != icmp_bi)
 748             {
 749               next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
 750               to_next[0] = icmp_bi;
 751               to_next += 1;
 752               n_left_to_next -= 1;
 753               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 754                                                n_left_to_next, icmp_bi,
 755                                                next0);
 756             }
 757
 758         next_packet:
 759           from += 1;
 760           n_left_from -= 1;
 761         }
 762
 763       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 764     }
 765
 766   clib_spinlock_unlock (&rt->lock);
 767   return frame->n_vectors;
 768 }
 769
 770 static char *ip6_sv_reassembly_error_strings[] = {
 771 #define _(sym, string) string,
 772   foreach_ip6_error
 773 #undef _
 774 };
 775
 776 VLIB_NODE_FN (ip6_sv_reass_node) (vlib_main_t * vm,
 777                                   vlib_node_runtime_t * node,
 778                                   vlib_frame_t * frame)
 779 {
 780   return ip6_sv_reassembly_inline (vm, node, frame, false /* is_feature */ );
 781 }
 782
 783 /* *INDENT-OFF* */
 784 VLIB_REGISTER_NODE (ip6_sv_reass_node) = {
 785     .name = "ip6-sv-reassembly",
 786     .vector_size = sizeof (u32),
 787     .format_trace = format_ip6_sv_reass_trace,
 788     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
 789     .error_strings = ip6_sv_reassembly_error_strings,
 790     .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
 791     .next_nodes =
 792         {
 793                 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
 794                 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
 795                 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
 796                 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reassembly-handoff",
 797         },
 798 };
 799 /* *INDENT-ON* */
 800
 801 VLIB_NODE_FN (ip6_sv_reass_node_feature) (vlib_main_t * vm,
 802                                           vlib_node_runtime_t * node,
 803                                           vlib_frame_t * frame)
 804 {
 805   return ip6_sv_reassembly_inline (vm, node, frame, true /* is_feature */ );
 806 }
 807
 808 /* *INDENT-OFF* */
 809 VLIB_REGISTER_NODE (ip6_sv_reass_node_feature) = {
 810     .name = "ip6-sv-reassembly-feature",
 811     .vector_size = sizeof (u32),
 812     .format_trace = format_ip6_sv_reass_trace,
 813     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
 814     .error_strings = ip6_sv_reassembly_error_strings,
 815     .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
 816     .next_nodes =
 817         {
 818                 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
 819                 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
 820                 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
 821                 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reass-feature-hoff",
 822         },
 823 };
 824 /* *INDENT-ON* */
 825
 826 /* *INDENT-OFF* */
 827 VNET_FEATURE_INIT (ip6_sv_reassembly_feature) = {
 828     .arc_name = "ip6-unicast",
 829     .node_name = "ip6-sv-reassembly-feature",
 830     .runs_before = VNET_FEATURES ("ip6-lookup"),
 831     .runs_after = 0,
 832 };
 833 /* *INDENT-ON* */
 834
 835 #ifndef CLIB_MARCH_VARIANT
 836 static u32
 837 ip6_sv_reass_get_nbuckets ()
 838 {
 839   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 840   u32 nbuckets;
 841   u8 i;
 842
 843   nbuckets = (u32) (rm->max_reass_n / IP6_SV_REASS_HT_LOAD_FACTOR);
 844
 845   for (i = 0; i < 31; i++)
 846     if ((1 << i) >= nbuckets)
 847       break;
 848   nbuckets = 1 << i;
 849
 850   return nbuckets;
 851 }
 852 #endif /* CLIB_MARCH_VARIANT */
 853
 854 typedef enum
 855 {
 856   IP6_EVENT_CONFIG_CHANGED = 1,
 857 } ip6_sv_reass_event_t;
 858
 859 #ifndef CLIB_MARCH_VARIANT
 860 typedef struct
 861 {
 862   int failure;
 863   clib_bihash_48_8_t *new_hash;
 864 } ip6_rehash_cb_ctx;
 865
 866 static int
 867 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
 868 {
 869   ip6_rehash_cb_ctx *ctx = _ctx;
 870   if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
 871     {
 872       ctx->failure = 1;
 873     }
 874   return (BIHASH_WALK_CONTINUE);
 875 }
 876
 877 static void
 878 ip6_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
 879                          u32 max_reassembly_length,
 880                          u32 expire_walk_interval_ms)
 881 {
 882   ip6_sv_reass_main.timeout_ms = timeout_ms;
 883   ip6_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
 884   ip6_sv_reass_main.max_reass_n = max_reassemblies;
 885   ip6_sv_reass_main.max_reass_len = max_reassembly_length;
 886   ip6_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
 887 }
 888
 889 vnet_api_error_t
 890 ip6_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
 891                   u32 max_reassembly_length, u32 expire_walk_interval_ms)
 892 {
 893   u32 old_nbuckets = ip6_sv_reass_get_nbuckets ();
 894   ip6_sv_reass_set_params (timeout_ms, max_reassemblies,
 895                            max_reassembly_length, expire_walk_interval_ms);
 896   vlib_process_signal_event (ip6_sv_reass_main.vlib_main,
 897                              ip6_sv_reass_main.ip6_sv_reass_expire_node_idx,
 898                              IP6_EVENT_CONFIG_CHANGED, 0);
 899   u32 new_nbuckets = ip6_sv_reass_get_nbuckets ();
 900   if (ip6_sv_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
 901     {
 902       clib_bihash_48_8_t new_hash;
 903       clib_memset (&new_hash, 0, sizeof (new_hash));
 904       ip6_rehash_cb_ctx ctx;
 905       ctx.failure = 0;
 906       ctx.new_hash = &new_hash;
 907       clib_bihash_init_48_8 (&new_hash, "ip6-sv-reass", new_nbuckets,
 908                              new_nbuckets * 1024);
 909       clib_bihash_foreach_key_value_pair_48_8 (&ip6_sv_reass_main.hash,
 910                                                ip6_rehash_cb, &ctx);
 911       if (ctx.failure)
 912         {
 913           clib_bihash_free_48_8 (&new_hash);
 914           return -1;
 915         }
 916       else
 917         {
 918           clib_bihash_free_48_8 (&ip6_sv_reass_main.hash);
 919           clib_memcpy_fast (&ip6_sv_reass_main.hash, &new_hash,
 920                             sizeof (ip6_sv_reass_main.hash));
 921           clib_bihash_copied (&ip6_sv_reass_main.hash, &new_hash);
 922         }
 923     }
 924   return 0;
 925 }
 926
 927 vnet_api_error_t
 928 ip6_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
 929                   u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
 930 {
 931   *timeout_ms = ip6_sv_reass_main.timeout_ms;
 932   *max_reassemblies = ip6_sv_reass_main.max_reass_n;
 933   *max_reassembly_length = ip6_sv_reass_main.max_reass_len;
 934   *expire_walk_interval_ms = ip6_sv_reass_main.expire_walk_interval_ms;
 935   return 0;
 936 }
 937
 938 static clib_error_t *
 939 ip6_sv_reass_init_function (vlib_main_t * vm)
 940 {
 941   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
 942   clib_error_t *error = 0;
 943   u32 nbuckets;
 944   vlib_node_t *node;
 945
 946   rm->vlib_main = vm;
 947   rm->vnet_main = vnet_get_main ();
 948
 949   vec_validate (rm->per_thread_data, vlib_num_workers ());
 950   ip6_sv_reass_per_thread_t *rt;
 951   vec_foreach (rt, rm->per_thread_data)
 952   {
 953     clib_spinlock_init (&rt->lock);
 954     pool_alloc (rt->pool, rm->max_reass_n);
 955     rt->lru_first = rt->lru_last = ~0;
 956   }
 957
 958   node = vlib_get_node_by_name (vm, (u8 *) "ip6-sv-reassembly-expire-walk");
 959   ASSERT (node);
 960   rm->ip6_sv_reass_expire_node_idx = node->index;
 961
 962   ip6_sv_reass_set_params (IP6_SV_REASS_TIMEOUT_DEFAULT_MS,
 963                            IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
 964                            IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
 965                            IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
 966
 967   nbuckets = ip6_sv_reass_get_nbuckets ();
 968   clib_bihash_init_48_8 (&rm->hash, "ip6-sv-reass", nbuckets,
 969                          nbuckets * 1024);
 970
 971   node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
 972   ASSERT (node);
 973   rm->ip6_drop_idx = node->index;
 974   node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
 975   ASSERT (node);
 976   rm->ip6_icmp_error_idx = node->index;
 977
 978   if ((error = vlib_call_init_function (vm, ip_main_init)))
 979     return error;
 980   ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
 981                          ip6_sv_reass_node.index);
 982
 983   rm->fq_index = vlib_frame_queue_main_init (ip6_sv_reass_node.index, 0);
 984   rm->fq_feature_index =
 985     vlib_frame_queue_main_init (ip6_sv_reass_node_feature.index, 0);
 986
 987   rm->feature_use_refcount_per_intf = NULL;
 988
 989   return error;
 990 }
 991
 992 VLIB_INIT_FUNCTION (ip6_sv_reass_init_function);
 993 #endif /* CLIB_MARCH_VARIANT */
 994
 995 static uword
 996 ip6_sv_reass_walk_expired (vlib_main_t * vm,
 997                            vlib_node_runtime_t * node, vlib_frame_t * f)
 998 {
 999   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1000   uword event_type, *event_data = 0;
1001
1002   while (true)
1003     {
1004       vlib_process_wait_for_event_or_clock (vm,
1005                                             (f64) rm->expire_walk_interval_ms
1006                                             / (f64) MSEC_PER_SEC);
1007       event_type = vlib_process_get_events (vm, &event_data);
1008
1009       switch (event_type)
1010         {
1011         case ~0:                /* no events => timeout */
1012           /* nothing to do here */
1013           break;
1014         case IP6_EVENT_CONFIG_CHANGED:
1015           break;
1016         default:
1017           clib_warning ("BUG: event type 0x%wx", event_type);
1018           break;
1019         }
1020       f64 now = vlib_time_now (vm);
1021
1022       ip6_sv_reass_t *reass;
1023       int *pool_indexes_to_free = NULL;
1024
1025       uword thread_index = 0;
1026       int index;
1027       const uword nthreads = vlib_num_workers () + 1;
1028       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1029         {
1030           ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1031           clib_spinlock_lock (&rt->lock);
1032
1033           vec_reset_length (pool_indexes_to_free);
1034           /* *INDENT-OFF* */
1035           pool_foreach_index (index, rt->pool, ({
1036                                 reass = pool_elt_at_index (rt->pool, index);
1037                                 if (now > reass->last_heard + rm->timeout)
1038                                   {
1039                                     vec_add1 (pool_indexes_to_free, index);
1040                                   }
1041                               }));
1042           /* *INDENT-ON* */
1043           int *i;
1044           /* *INDENT-OFF* */
1045           vec_foreach (i, pool_indexes_to_free)
1046           {
1047             ip6_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1048             ip6_sv_reass_free (vm, rm, rt, reass);
1049           }
1050           /* *INDENT-ON* */
1051
1052           clib_spinlock_unlock (&rt->lock);
1053         }
1054
1055       vec_free (pool_indexes_to_free);
1056       if (event_data)
1057         {
1058           _vec_len (event_data) = 0;
1059         }
1060     }
1061
1062   return 0;
1063 }
1064
1065 /* *INDENT-OFF* */
1066 VLIB_REGISTER_NODE (ip6_sv_reass_expire_node) = {
1067     .function = ip6_sv_reass_walk_expired,
1068     .format_trace = format_ip6_sv_reass_trace,
1069     .type = VLIB_NODE_TYPE_PROCESS,
1070     .name = "ip6-sv-reassembly-expire-walk",
1071
1072     .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
1073     .error_strings = ip6_sv_reassembly_error_strings,
1074
1075 };
1076 /* *INDENT-ON* */
1077
1078 static u8 *
1079 format_ip6_sv_reass_key (u8 * s, va_list * args)
1080 {
1081   ip6_sv_reass_key_t *key = va_arg (*args, ip6_sv_reass_key_t *);
1082   s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1083               key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1084               &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1085   return s;
1086 }
1087
1088 static u8 *
1089 format_ip6_sv_reass (u8 * s, va_list * args)
1090 {
1091   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1092   ip6_sv_reass_t *reass = va_arg (*args, ip6_sv_reass_t *);
1093
1094   s = format (s, "ID: %lu, key: %U, trace_op_counter: %u\n",
1095               reass->id, format_ip6_sv_reass_key, &reass->key,
1096               reass->trace_op_counter);
1097   vlib_buffer_t *b;
1098   u32 *bip;
1099   u32 counter = 0;
1100   vec_foreach (bip, reass->cached_buffers)
1101   {
1102     u32 bi = *bip;
1103     do
1104       {
1105         b = vlib_get_buffer (vm, bi);
1106         s = format (s, "  #%03u: bi: %u\n", counter, bi);
1107         ++counter;
1108         bi = b->next_buffer;
1109       }
1110     while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1111   }
1112   return s;
1113 }
1114
1115 static clib_error_t *
1116 show_ip6_sv_reass (vlib_main_t * vm, unformat_input_t * input,
1117                    CLIB_UNUSED (vlib_cli_command_t * lmd))
1118 {
1119   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1120
1121   vlib_cli_output (vm, "---------------------");
1122   vlib_cli_output (vm, "IP6 reassembly status");
1123   vlib_cli_output (vm, "---------------------");
1124   bool details = false;
1125   if (unformat (input, "details"))
1126     {
1127       details = true;
1128     }
1129
1130   u32 sum_reass_n = 0;
1131   u64 sum_buffers_n = 0;
1132   ip6_sv_reass_t *reass;
1133   uword thread_index;
1134   const uword nthreads = vlib_num_workers () + 1;
1135   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1136     {
1137       ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1138       clib_spinlock_lock (&rt->lock);
1139       if (details)
1140         {
1141           /* *INDENT-OFF* */
1142           pool_foreach (reass, rt->pool, {
1143             vlib_cli_output (vm, "%U", format_ip6_sv_reass, vm, reass);
1144           });
1145           /* *INDENT-ON* */
1146         }
1147       sum_reass_n += rt->reass_n;
1148       clib_spinlock_unlock (&rt->lock);
1149     }
1150   vlib_cli_output (vm, "---------------------");
1151   vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1152                    (long unsigned) sum_reass_n);
1153   vlib_cli_output (vm,
1154                    "Maximum configured concurrent shallow virtual IP6 reassemblies per worker-thread: %lu\n",
1155                    (long unsigned) rm->max_reass_n);
1156   vlib_cli_output (vm,
1157                    "Maximum configured shallow virtual IP6 reassembly timeout: %lums\n",
1158                    (long unsigned) rm->timeout_ms);
1159   vlib_cli_output (vm,
1160                    "Maximum configured shallow virtual IP6 reassembly expire walk interval: %lums\n",
1161                    (long unsigned) rm->expire_walk_interval_ms);
1162   vlib_cli_output (vm, "Buffers in use: %lu\n",
1163                    (long unsigned) sum_buffers_n);
1164   return 0;
1165 }
1166
1167 /* *INDENT-OFF* */
1168 VLIB_CLI_COMMAND (show_ip6_sv_reassembly_cmd, static) = {
1169     .path = "show ip6-sv-reassembly",
1170     .short_help = "show ip6-sv-reassembly [details]",
1171     .function = show_ip6_sv_reass,
1172 };
1173 /* *INDENT-ON* */
1174
1175 #ifndef CLIB_MARCH_VARIANT
1176 vnet_api_error_t
1177 ip6_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1178 {
1179   return ip6_sv_reass_enable_disable_with_refcnt (sw_if_index,
1180                                                   enable_disable);
1181 }
1182 #endif /* CLIB_MARCH_VARIANT */
1183
1184 #define foreach_ip6_sv_reassembly_handoff_error                       \
1185 _(CONGESTION_DROP, "congestion drop")
1186
1187
1188 typedef enum
1189 {
1190 #define _(sym,str) IP6_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
1191   foreach_ip6_sv_reassembly_handoff_error
1192 #undef _
1193     IP6_SV_REASSEMBLY_HANDOFF_N_ERROR,
1194 } ip6_sv_reassembly_handoff_error_t;
1195
1196 static char *ip6_sv_reassembly_handoff_error_strings[] = {
1197 #define _(sym,string) string,
1198   foreach_ip6_sv_reassembly_handoff_error
1199 #undef _
1200 };
1201
1202 typedef struct
1203 {
1204   u32 next_worker_index;
1205 } ip6_sv_reassembly_handoff_trace_t;
1206
1207 static u8 *
1208 format_ip6_sv_reassembly_handoff_trace (u8 * s, va_list * args)
1209 {
1210   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1211   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1212   ip6_sv_reassembly_handoff_trace_t *t =
1213     va_arg (*args, ip6_sv_reassembly_handoff_trace_t *);
1214
1215   s =
1216     format (s, "ip6-sv-reassembly-handoff: next-worker %d",
1217             t->next_worker_index);
1218
1219   return s;
1220 }
1221
1222 always_inline uword
1223 ip6_sv_reassembly_handoff_inline (vlib_main_t * vm,
1224                                   vlib_node_runtime_t * node,
1225                                   vlib_frame_t * frame, bool is_feature)
1226 {
1227   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1228
1229   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1230   u32 n_enq, n_left_from, *from;
1231   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1232   u32 fq_index;
1233
1234   from = vlib_frame_vector_args (frame);
1235   n_left_from = frame->n_vectors;
1236   vlib_get_buffers (vm, from, bufs, n_left_from);
1237
1238   b = bufs;
1239   ti = thread_indices;
1240
1241   fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1242
1243   while (n_left_from > 0)
1244     {
1245       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1246
1247       if (PREDICT_FALSE
1248           ((node->flags & VLIB_NODE_FLAG_TRACE)
1249            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1250         {
1251           ip6_sv_reassembly_handoff_trace_t *t =
1252             vlib_add_trace (vm, node, b[0], sizeof (*t));
1253           t->next_worker_index = ti[0];
1254         }
1255
1256       n_left_from -= 1;
1257       ti += 1;
1258       b += 1;
1259     }
1260   n_enq =
1261     vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1262                                    frame->n_vectors, 1);
1263
1264   if (n_enq < frame->n_vectors)
1265     vlib_node_increment_counter (vm, node->node_index,
1266                                  IP6_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1267                                  frame->n_vectors - n_enq);
1268   return frame->n_vectors;
1269 }
1270
1271 VLIB_NODE_FN (ip6_sv_reassembly_handoff_node) (vlib_main_t * vm,
1272                                                vlib_node_runtime_t * node,
1273                                                vlib_frame_t * frame)
1274 {
1275   return ip6_sv_reassembly_handoff_inline (vm, node, frame,
1276                                            false /* is_feature */ );
1277 }
1278
1279 /* *INDENT-OFF* */
1280 VLIB_REGISTER_NODE (ip6_sv_reassembly_handoff_node) = {
1281   .name = "ip6-sv-reassembly-handoff",
1282   .vector_size = sizeof (u32),
1283   .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1284   .error_strings = ip6_sv_reassembly_handoff_error_strings,
1285   .format_trace = format_ip6_sv_reassembly_handoff_trace,
1286
1287   .n_next_nodes = 1,
1288
1289   .next_nodes = {
1290     [0] = "error-drop",
1291   },
1292 };
1293
1294
1295 VLIB_NODE_FN (ip6_sv_reassembly_feature_handoff_node) (vlib_main_t * vm,
1296                                vlib_node_runtime_t * node, vlib_frame_t * frame)
1297 {
1298   return ip6_sv_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1299 }
1300
1301
1302 /* *INDENT-OFF* */
1303 VLIB_REGISTER_NODE (ip6_sv_reassembly_feature_handoff_node) = {
1304   .name = "ip6-sv-reass-feature-hoff",
1305   .vector_size = sizeof (u32),
1306   .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1307   .error_strings = ip6_sv_reassembly_handoff_error_strings,
1308   .format_trace = format_ip6_sv_reassembly_handoff_trace,
1309
1310   .n_next_nodes = 1,
1311
1312   .next_nodes = {
1313     [0] = "error-drop",
1314   },
1315 };
1316 /* *INDENT-ON* */
1317
1318 #ifndef CLIB_MARCH_VARIANT
1319 int
1320 ip6_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1321 {
1322   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1323   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1324   if (is_enable)
1325     {
1326       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1327         {
1328           ++rm->feature_use_refcount_per_intf[sw_if_index];
1329           return vnet_feature_enable_disable ("ip6-unicast",
1330                                               "ip6-sv-reassembly-feature",
1331                                               sw_if_index, 1, 0, 0);
1332         }
1333       ++rm->feature_use_refcount_per_intf[sw_if_index];
1334     }
1335   else
1336     {
1337       --rm->feature_use_refcount_per_intf[sw_if_index];
1338       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1339         return vnet_feature_enable_disable ("ip6-unicast",
1340                                             "ip6-sv-reassembly-feature",
1341                                             sw_if_index, 0, 0, 0);
1342     }
1343   return 0;
1344 }
1345 #endif
1346
1347 /*
1348  * fd.io coding-style-patch-verification: ON
1349  *
1350  * Local Variables:
1351  * eval: (c-set-style "gnu")
1352  * End:
1353  */