summaryrefslogtreecommitdiffstats
path: root/src
diff options
context:
space:
mode:
authorNeale Ranns <neale@graphiant.com>2021-07-15 08:11:38 +0000
committerDamjan Marion <dmarion@me.com>2021-07-15 14:50:50 +0000
commit5be3d4cc59ea955cff35ef962fd908e1147eea99 (patch)
tree7d181452e25db812d488c0ffd3a18e581c717967 /src
parent05698730e42346c54b7405c6c1a498a0467261ab (diff)
acl: Fix the CLI to accept IPv6 prefixes
Type: fix DBGvpp# set acl-plugin acl src 1::1/128 dst 2::/64 DBGvpp# sh acl-plugin acl acl-index 0 count 1 tag {cli} 0: ipv4 permit src 1.1.1.1/32 dst 1.1.1.2/32 proto 0 sport 0-65535 dport 0-65535 acl-index 1 count 1 tag {cli} 0: ipv6 permit src 1::1/128 dst 2::/64 proto 0 sport 0-65535 dport 0-65535 Signed-off-by: Neale Ranns <neale@graphiant.com> Change-Id: Ibb8e20dd4ec2792f423a61eefe7398175e45a577
Diffstat (limited to 'src')
-rw-r--r--src/plugins/acl/acl.c21
1 files changed, 5 insertions, 16 deletions
diff --git a/src/plugins/acl/acl.c b/src/plugins/acl/acl.c
index dcca2a2c9ba..e8b5877ab21 100644
--- a/src/plugins/acl/acl.c
+++ b/src/plugins/acl/acl.c
@@ -2837,8 +2837,7 @@ acl_set_aclplugin_acl_fn (vlib_main_t * vm,
u32 port2 = 0;
u32 action = 0;
u32 tcpflags, tcpmask;
- u32 src_prefix_length = 0, dst_prefix_length = 0;
- ip46_address_t src, dst;
+ ip_prefix_t src, dst;
u8 *tag = 0;
if (!unformat_user (input, unformat_line_input, line_input))
@@ -2870,25 +2869,15 @@ acl_set_aclplugin_acl_fn (vlib_main_t * vm,
vec_validate_acl_rules (rules, rule_idx);
rules[rule_idx].is_permit = action;
}
- else if (unformat (line_input, "src %U/%d",
- unformat_ip46_address, &src, IP46_TYPE_ANY,
- &src_prefix_length))
+ else if (unformat (line_input, "src %U", unformat_ip_prefix, &src))
{
vec_validate_acl_rules (rules, rule_idx);
- ip_address_encode (&src, IP46_TYPE_ANY,
- &rules[rule_idx].src_prefix.address);
- rules[rule_idx].src_prefix.address.af = ADDRESS_IP4;
- rules[rule_idx].src_prefix.len = src_prefix_length;
+ ip_prefix_encode2 (&src, &rules[rule_idx].src_prefix);
}
- else if (unformat (line_input, "dst %U/%d",
- unformat_ip46_address, &dst, IP46_TYPE_ANY,
- &dst_prefix_length))
+ else if (unformat (line_input, "dst %U", unformat_ip_prefix, &dst))
{
vec_validate_acl_rules (rules, rule_idx);
- ip_address_encode (&dst, IP46_TYPE_ANY,
- &rules[rule_idx].dst_prefix.address);
- rules[rule_idx].dst_prefix.address.af = ADDRESS_IP4;
- rules[rule_idx].dst_prefix.len = dst_prefix_length;
+ ip_prefix_encode2 (&dst, &rules[rule_idx].dst_prefix);
}
else if (unformat (line_input, "sport %d-%d", &port1, &port2))
{
226'>226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 
/*
 * snat.c - simple nat plugin
 *
 * Copyright (c) 2016 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <vnet/vnet.h>
#include <vnet/plugin/plugin.h>
#include <vlibapi/api.h>
#include <snat/snat.h>

#include <vlibapi/api.h>
#include <vlibmemory/api.h>
#include <vlibsocket/api.h>

snat_main_t snat_main;

/* define message IDs */
#include <snat/snat_msg_enum.h>

/* define message structures */
#define vl_typedefs
#include <snat/snat_all_api_h.h> 
#undef vl_typedefs

/* define generated endian-swappers */
#define vl_endianfun
#include <snat/snat_all_api_h.h> 
#undef vl_endianfun

#define vl_print(handle, ...) vlib_cli_output (handle, __VA_ARGS__)

/* Get the API version number */
#define vl_api_version(n,v) static u32 api_version=(v);
#include <snat/snat_all_api_h.h>
#undef vl_api_version

/* Macro to finish up custom dump fns */
#define FINISH                                  \
    vec_add1 (s, 0);                            \
    vl_print (handle, (char *)s);               \
    vec_free (s);                               \
    return handle;

/* 
 * A handy macro to set up a message reply.
 * Assumes that the following variables are available:
 * mp - pointer to request message
 * rmp - pointer to reply message type
 * rv - return value
 */

#define REPLY_MACRO(t)                                          \
do {                                                            \
    unix_shared_memory_queue_t * q =                            \
    vl_api_client_index_to_input_queue (mp->client_index);      \
    if (!q)                                                     \
        return;                                                 \
                                                                \
    rmp = vl_msg_api_alloc (sizeof (*rmp));                     \
    rmp->_vl_msg_id = ntohs((t)+sm->msg_id_base);               \
    rmp->context = mp->context;                                 \
    rmp->retval = ntohl(rv);                                    \
                                                                \
    vl_msg_api_send_shmem (q, (u8 *)&rmp);                      \
} while(0);


/* Hook up input features */
VNET_IP4_UNICAST_FEATURE_INIT (ip4_snat_in2out, static) = {
  .node_name = "snat-in2out",
  .runs_before = {"snat-out2in", 0},
  .feature_index = &snat_main.rx_feature_in2out,
};
VNET_IP4_UNICAST_FEATURE_INIT (ip4_snat_out2in, static) = {
  .node_name = "snat-out2in",
  .runs_before = {"ip4-lookup", 0},
  .feature_index = &snat_main.rx_feature_out2in,
};

/* 
 * This routine exists to convince the vlib plugin framework that
 * we haven't accidentally copied a random .dll into the plugin directory.
 *
 * Also collects global variable pointers passed from the vpp engine
 */

clib_error_t * 
vlib_plugin_register (vlib_main_t * vm, vnet_plugin_handoff_t * h,
                      int from_early_init)
{
  snat_main_t * sm = &snat_main;
  clib_error_t * error = 0;

  sm->vlib_main = vm;
  sm->vnet_main = h->vnet_main;
  sm->ethernet_main = h->ethernet_main;

  return error;
}

/*$$$$$ move to an installed header file */
#if (1 || CLIB_DEBUG > 0)       /* "trust, but verify" */

#define VALIDATE_SW_IF_INDEX(mp)				\
 do { u32 __sw_if_index = ntohl(mp->sw_if_index);		\
    vnet_main_t *__vnm = vnet_get_main();                       \
    if (pool_is_free_index(__vnm->interface_main.sw_interfaces, \
                           __sw_if_index)) {                    \
        rv = VNET_API_ERROR_INVALID_SW_IF_INDEX;                \
        goto bad_sw_if_index;                                   \
    }                                                           \
} while(0);

#define BAD_SW_IF_INDEX_LABEL                   \
do {                                            \
bad_sw_if_index:                                \
    ;                                           \
} while (0);

#define VALIDATE_RX_SW_IF_INDEX(mp)				\
 do { u32 __rx_sw_if_index = ntohl(mp->rx_sw_if_index);		\
    vnet_main_t *__vnm = vnet_get_main();                       \
    if (pool_is_free_index(__vnm->interface_main.sw_interfaces, \
                           __rx_sw_if_index)) {			\
        rv = VNET_API_ERROR_INVALID_SW_IF_INDEX;                \
        goto bad_rx_sw_if_index;				\
    }                                                           \
} while(0);

#define BAD_RX_SW_IF_INDEX_LABEL		\
do {                                            \
bad_rx_sw_if_index:				\
    ;                                           \
} while (0);

#define VALIDATE_TX_SW_IF_INDEX(mp)				\
 do { u32 __tx_sw_if_index = ntohl(mp->tx_sw_if_index);		\
    vnet_main_t *__vnm = vnet_get_main();                       \
    if (pool_is_free_index(__vnm->interface_main.sw_interfaces, \
                           __tx_sw_if_index)) {			\
        rv = VNET_API_ERROR_INVALID_SW_IF_INDEX;                \
        goto bad_tx_sw_if_index;				\
    }                                                           \
} while(0);

#define BAD_TX_SW_IF_INDEX_LABEL		\
do {                                            \
bad_tx_sw_if_index:				\
    ;                                           \
} while (0);

#else

#define VALIDATE_SW_IF_INDEX(mp)
#define BAD_SW_IF_INDEX_LABEL
#define VALIDATE_RX_SW_IF_INDEX(mp)
#define BAD_RX_SW_IF_INDEX_LABEL
#define VALIDATE_TX_SW_IF_INDEX(mp)
#define BAD_TX_SW_IF_INDEX_LABEL

#endif  /* CLIB_DEBUG > 0 */

void snat_add_address (snat_main_t *sm, ip4_address_t *addr)
{
  snat_address_t * ap;

  vec_add2 (sm->addresses, ap, 1);
  ap->addr = *addr;

}

static void increment_v4_address (ip4_address_t * a)
{
  u32 v;
  
  v = clib_net_to_host_u32(a->as_u32) + 1;
  a->as_u32 = clib_host_to_net_u32(v);
}

static void 
vl_api_snat_add_address_range_t_handler
(vl_api_snat_add_address_range_t * mp)
{
  snat_main_t * sm = &snat_main;
  vl_api_snat_add_address_range_reply_t * rmp;
  ip4_address_t this_addr;
  u32 start_host_order, end_host_order;
  int i, count;
  int rv = 0;
  u32 * tmp;

  if (mp->is_ip4 != 1)
    {
      rv = VNET_API_ERROR_UNIMPLEMENTED;
      goto send_reply;
    }

  tmp = (u32 *) mp->first_ip_address;
  start_host_order = clib_host_to_net_u32 (tmp[0]);
  tmp = (u32 *) mp->last_ip_address;
  end_host_order = clib_host_to_net_u32 (tmp[0]);

  count = (end_host_order - start_host_order) + 1;

  if (count > 1024)
    clib_warning ("%U - %U, %d addresses...",
                  format_ip4_address, mp->first_ip_address,
                  format_ip4_address, mp->last_ip_address,
                  count);
  
  memcpy (&this_addr.as_u8, mp->first_ip_address, 4);

  for (i = 0; i < count; i++)
    {
      snat_add_address (sm, &this_addr);
      increment_v4_address (&this_addr);
    }

 send_reply:
  REPLY_MACRO (VL_API_SNAT_ADD_ADDRESS_RANGE_REPLY);
}

static void *vl_api_snat_add_address_range_t_print
(vl_api_snat_add_address_range_t *mp, void * handle)
{
  u8 * s;

  s = format (0, "SCRIPT: snat_add_address_range ");
  s = format (s, "%U ", format_ip4_address, mp->first_ip_address);
  if (memcmp (mp->first_ip_address, mp->last_ip_address, 4))
    {
      s = format (s, " - %U ", format_ip4_address, mp->last_ip_address);
    }
  FINISH;
}

static void
vl_api_snat_interface_add_del_feature_t_handler
(vl_api_snat_interface_add_del_feature_t * mp)
{
  snat_main_t * sm = &snat_main;
  vl_api_snat_interface_add_del_feature_reply_t * rmp;
  u8 is_del = mp->is_add == 0;
  u32 sw_if_index = ntohl(mp->sw_if_index);
  u32 ci;
  ip4_main_t * im = &ip4_main;
  ip_lookup_main_t * lm = &im->lookup_main;
  ip_config_main_t * rx_cm = &lm->rx_config_mains[VNET_UNICAST];
  u32 feature_index;
  int rv = 0;

  VALIDATE_SW_IF_INDEX(mp);

  feature_index = mp->is_inside ? sm->rx_feature_in2out
    : sm->rx_feature_out2in;

  ci = rx_cm->config_index_by_sw_if_index[sw_if_index];
  ci = (is_del
        ? vnet_config_del_feature
        : vnet_config_add_feature)
    (sm->vlib_main, &rx_cm->config_main,
     ci,
     feature_index,
     0 /* config struct */, 
     0 /* sizeof config struct*/);
  rx_cm->config_index_by_sw_if_index[sw_if_index] = ci;
  
  BAD_SW_IF_INDEX_LABEL;

  REPLY_MACRO(VL_API_SNAT_INTERFACE_ADD_DEL_FEATURE_REPLY);
}

static void *vl_api_snat_interface_add_del_feature_t_print
(vl_api_snat_interface_add_del_feature_t * mp, void *handle)
{
  u8 * s;

  s = format (0, "SCRIPT: snat_interface_add_del_feature ");
  s = format (s, "sw_if_index %d %s %s",
              clib_host_to_net_u32(mp->sw_if_index),
              mp->is_inside ? "in":"out",
              mp->is_add ? "" : "del");

  FINISH;
}

/* List of message types that this plugin understands */
#define foreach_snat_plugin_api_msg                                     \
_(SNAT_ADD_ADDRESS_RANGE, snat_add_address_range)                       \
_(SNAT_INTERFACE_ADD_DEL_FEATURE, snat_interface_add_del_feature)

/* Set up the API message handling tables */
static clib_error_t *
snat_plugin_api_hookup (vlib_main_t *vm)
{
   snat_main_t * sm __attribute__ ((unused)) = &snat_main;
#define _(N,n)                                                  \
    vl_msg_api_set_handlers((VL_API_##N + sm->msg_id_base),     \
                           #n,					\
                           vl_api_##n##_t_handler,              \
                           vl_noop_handler,                     \
                           vl_api_##n##_t_endian,               \
                           vl_api_##n##_t_print,                \
                           sizeof(vl_api_##n##_t), 1); 
    foreach_snat_plugin_api_msg;
#undef _

    return 0;
}

static void plugin_custom_dump_configure (snat_main_t * sm) 
{
#define _(n,f) sm->api_main->msg_print_handlers \
  [VL_API_##n + sm->msg_id_base]                \
    = (void *) vl_api_##f##_t_print;
  foreach_snat_plugin_api_msg;
#undef _
}

static clib_error_t * snat_init (vlib_main_t * vm)
{
  snat_main_t * sm = &snat_main;
  clib_error_t * error = 0;
  ip4_main_t * im = &ip4_main;
  ip_lookup_main_t * lm = &im->lookup_main;
  u8 * name;

  name = format (0, "snat_%08x%c", api_version, 0);

  /* Ask for a correctly-sized block of API message decode slots */
  sm->msg_id_base = vl_msg_api_get_msg_ids 
      ((char *) name, VL_MSG_FIRST_AVAILABLE);

  sm->vlib_main = vm;
  sm->vnet_main = vnet_get_main();
  sm->ip4_main = im;
  sm->ip4_lookup_main = lm;
  sm->api_main = &api_main;

  error = snat_plugin_api_hookup (vm);
  plugin_custom_dump_configure (sm);
  vec_free(name);

  return error;
}

VLIB_INIT_FUNCTION (snat_init);

void snat_free_outside_address_and_port (snat_main_t * sm, 
                                         snat_session_key_t * k, 
                                         u32 address_index)
{
  snat_address_t *a;
  u16 port_host_byte_order = clib_net_to_host_u16 (k->port);
  
  ASSERT (address_index < vec_len (sm->addresses));

  a = sm->addresses + address_index;

  ASSERT (clib_bitmap_get (a->busy_port_bitmap, port_host_byte_order) == 1);

  a->busy_port_bitmap = clib_bitmap_set (a->busy_port_bitmap, 
                                         port_host_byte_order, 0);
  a->busy_ports--;
}  

int snat_alloc_outside_address_and_port (snat_main_t * sm, 
                                         snat_session_key_t * k,
                                         u32 * address_indexp)
{
  int i;
  snat_address_t *a;
  u32 portnum;

  for (i = 0; i < vec_len (sm->addresses); i++)
    {
      if (sm->addresses[i].busy_ports < (65535-1024))
        {
          a = sm->addresses + i;

          while (1)
            {
              portnum = random_u32 (&sm->random_seed);
              portnum &= 0xFFFF;
              if (portnum < 1024)
                continue;
              if (clib_bitmap_get (a->busy_port_bitmap, portnum))
                continue;
              a->busy_port_bitmap = clib_bitmap_set (a->busy_port_bitmap,
                                                     portnum, 1);
              a->busy_ports++;
              /* Caller sets protocol and fib index */
              k->addr = a->addr;
              k->port = clib_host_to_net_u16(portnum);
              *address_indexp = i;
              return 0;
            }
        }
    }
  /* Totally out of translations to use... */
  return 1;
}


static clib_error_t *
add_address_command_fn (vlib_main_t * vm,
                        unformat_input_t * input,
                        vlib_cli_command_t * cmd)
{
  snat_main_t * sm = &snat_main;
  ip4_address_t start_addr, end_addr, this_addr;
  u32 start_host_order, end_host_order;
  int i, count;

  if (unformat (input, "%U - %U", 
                unformat_ip4_address, &start_addr,
                unformat_ip4_address, &end_addr))
    ;
  else if (unformat (input, "%U", unformat_ip4_address, &start_addr))
    end_addr = start_addr;

  start_host_order = clib_host_to_net_u32 (start_addr.as_u32);
  end_host_order = clib_host_to_net_u32 (end_addr.as_u32);
  
  if (end_host_order < start_host_order)
    return clib_error_return (0, "end address less than start address");

  count = (end_host_order - start_host_order) + 1;

  if (count > 1024)
    clib_warning ("%U - %U, %d addresses...",
                  format_ip4_address, &start_addr,
                  format_ip4_address, &end_addr,
                  count);
  
  this_addr = start_addr;

  for (i = 0; i < count; i++)
    {
      snat_add_address (sm, &this_addr);
      increment_v4_address (&this_addr);
    }

  return 0;
}

VLIB_CLI_COMMAND (add_address_command, static) = {
  .path = "snat add address",
  .short_help = "snat add addresses <ip4-range-start> [- <ip4-range-end>]",
  .function = add_address_command_fn,
};

static clib_error_t *
snat_feature_command_fn (vlib_main_t * vm,
                          unformat_input_t * input,
                          vlib_cli_command_t * cmd)
{
  vnet_main_t * vnm = vnet_get_main();
  snat_main_t * sm = &snat_main;
  ip4_main_t * im = &ip4_main;
  ip_lookup_main_t * lm = &im->lookup_main;
  ip_config_main_t * rx_cm = &lm->rx_config_mains[VNET_UNICAST];
  clib_error_t * error = 0;
  u32 sw_if_index, ci;
  u32 feature_index;
  u32 * inside_sw_if_indices = 0;
  u32 * outside_sw_if_indices = 0;
  int is_del = 0;
  int i;

  sw_if_index = ~0;

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (input, "in %U", unformat_vnet_sw_interface, 
                    vnm, &sw_if_index))
        vec_add1 (inside_sw_if_indices, sw_if_index);
      else if (unformat (input, "out %U", unformat_vnet_sw_interface, 
                         vnm, &sw_if_index))
        vec_add1 (outside_sw_if_indices, sw_if_index);
      else if (unformat (input, "del"))
        is_del = 1;
      else
        break;
    }

  if (vec_len (inside_sw_if_indices))
    {
      feature_index = sm->rx_feature_in2out;

      for (i = 0; i < vec_len(inside_sw_if_indices); i++)
        {
          sw_if_index = inside_sw_if_indices[i];
          ci = rx_cm->config_index_by_sw_if_index[sw_if_index];
          ci = (is_del
                ? vnet_config_del_feature
                : vnet_config_add_feature)
            (vm, &rx_cm->config_main,
             ci,
             feature_index,
             0 /* config struct */, 
             0 /* sizeof config struct*/);
          rx_cm->config_index_by_sw_if_index[sw_if_index] = ci;
        }
    }

  if (vec_len (outside_sw_if_indices))
    {
      feature_index = sm->rx_feature_out2in;

      for (i = 0; i < vec_len(outside_sw_if_indices); i++)
        {
          sw_if_index = outside_sw_if_indices[i];
          ci = rx_cm->config_index_by_sw_if_index[sw_if_index];
          ci = (is_del
                ? vnet_config_del_feature
                : vnet_config_add_feature)
            (vm, &rx_cm->config_main,
             ci,
             feature_index,
             0 /* config struct */, 
             0 /* sizeof config struct*/);
          rx_cm->config_index_by_sw_if_index[sw_if_index] = ci;
        }
    }

  vec_free (inside_sw_if_indices);
  vec_free (outside_sw_if_indices);

  return error;
}

VLIB_CLI_COMMAND (set_interface_snat_command, static) = {
  .path = "set interface snat",
  .function = snat_feature_command_fn,
  .short_help = "set interface snat in <intfc> out <intfc> [del]",
};

static clib_error_t *
snat_config (vlib_main_t * vm, unformat_input_t * input)
{
  snat_main_t * sm = &snat_main;
  u32 translation_buckets = 1024;
  u32 translation_memory_size = 128<<20;
  u32 user_buckets = 128;
  u32 user_memory_size = 64<<20;
  u32 max_translations_per_user = 100;
  u32 outside_vrf_id = 0;

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (input, "translation hash buckets %d", &translation_buckets))
        ;
      else if (unformat (input, "translation hash memory %d",
                         &translation_memory_size));
      else if (unformat (input, "user hash buckets %d", &user_buckets))
        ;
      else if (unformat (input, "user hash memory %d",
                         &user_memory_size))
        ;
      else if (unformat (input, "max translations per user %d",
                         &max_translations_per_user))
        ;
      else if (unformat (input, "outside VRF id %d",
                         &outside_vrf_id))
        ;
      else 
	return clib_error_return (0, "unknown input `%U'",
				  format_unformat_error, input);
    }

  /* for show commands, etc. */
  sm->translation_buckets = translation_buckets;
  sm->translation_memory_size = translation_memory_size;
  sm->user_buckets = user_buckets;
  sm->user_memory_size = user_memory_size;
  sm->max_translations_per_user = max_translations_per_user;
  sm->outside_vrf_id = outside_vrf_id;

  clib_bihash_init_8_8 (&sm->in2out, "in2out", translation_buckets,
                        translation_memory_size);
  
  clib_bihash_init_8_8 (&sm->out2in, "out2in", translation_buckets,
                        translation_memory_size);

  clib_bihash_init_8_8 (&sm->user_hash, "users", user_buckets,
                        user_memory_size);
  return 0;
}

VLIB_CONFIG_FUNCTION (snat_config, "snat");

u8 * format_snat_key (u8 * s, va_list * args)
{
  snat_session_key_t * key = va_arg (*args, snat_session_key_t *);
  char * protocol_string = "unknown";
  static char *protocol_strings[] = {
      "UDP",
      "TCP",
      "ICMP",
  };

  if (key->protocol < ARRAY_LEN(protocol_strings))
      protocol_string = protocol_strings[key->protocol];

  s = format (s, "%U proto %s port %d fib %d",
              format_ip4_address, &key->addr, protocol_string,
              key->port, key->fib_index);
  return s;
}

u8 * format_snat_session (u8 * s, va_list * args)
{
  snat_main_t * sm __attribute__((unused)) = va_arg (*args, snat_main_t *);
  snat_session_t * sess = va_arg (*args, snat_session_t *);

  s = format (s, "  i2o %U\n", format_snat_key, &sess->in2out);
  s = format (s, "    o2i %U\n", format_snat_key, &sess->out2in);
  s = format (s, "       last heard %.2f\n", sess->last_heard);
  s = format (s, "       total pkts %d, total bytes %lld\n",
              sess->total_pkts, sess->total_bytes);

  return s;
}

u8 * format_snat_user (u8 * s, va_list * args)
{
  snat_main_t * sm = va_arg (*args, snat_main_t *);
  snat_user_t * u = va_arg (*args, snat_user_t *);
  int verbose = va_arg (*args, int);
  dlist_elt_t * head, * elt;
  u32 elt_index, head_index;
  u32 session_index;
  snat_session_t * sess;

  s = format (s, "%U: %d translations\n",
              format_ip4_address, &u->addr, u->nsessions);

  if (verbose == 0)
    return s;

  head_index = u->sessions_per_user_list_head_index;
  head = pool_elt_at_index (sm->list_pool, head_index);

  elt_index = head->next;
  elt = pool_elt_at_index (sm->list_pool, elt_index);
  session_index = elt->value;

  while (session_index != ~0)
    {
      sess = pool_elt_at_index (sm->sessions, session_index);

      s = format (s, "  %U\n", format_snat_session, sm, sess);

      elt_index = elt->next;
      elt = pool_elt_at_index (sm->list_pool, elt_index);
      session_index = elt->value;
    }

  return s;
}

static clib_error_t *
show_snat_command_fn (vlib_main_t * vm,
		 unformat_input_t * input,
		 vlib_cli_command_t * cmd)
{
  int verbose = 0;
  snat_main_t * sm = &snat_main;
  snat_user_t * u;

  if (unformat (input, "detail"))
    verbose = 1;
  else if (unformat (input, "verbose"))
    verbose = 2;

  vlib_cli_output (vm, "%d users, %d outside addresses, %d active sessions",
                   pool_elts (sm->users),
                   vec_len (sm->addresses),
                   pool_elts (sm->sessions));
  
  if (verbose > 0)
    {
      vlib_cli_output (vm, "%U", format_bihash_8_8, &sm->in2out,
                       verbose - 1);
      vlib_cli_output (vm, "%U", format_bihash_8_8, &sm->out2in,
                       verbose - 1);
      vlib_cli_output (vm, "%d list pool elements",
                       pool_elts (sm->list_pool));

      pool_foreach (u, sm->users,
      ({
        vlib_cli_output (vm, "%U", format_snat_user, sm, u, verbose - 1);
      }));
    }

  return 0;
}

VLIB_CLI_COMMAND (show_snat_command, static) = {
    .path = "show snat",
    .short_help = "show snat",
    .function = show_snat_command_fn,
};