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authorFilip Varga <fivarga@cisco.com>2020-08-04 18:06:06 +0200
committerOle Trøan <otroan@employees.org>2020-08-17 07:53:18 +0000
commit00dd39044e64b4a7a33d204ef7d19aac819d71f5 (patch)
tree0a065cc49ffe1458c81c96ebffda3f75a6e09128 /src/plugins/ikev2
parent17ec577f7b3b092e09d95451317957415f4baf4f (diff)
nat: sessions get expired when fib table removed
fib table removal would leave lingering sessions in vpp this patch is aimed at solving this issue by grouping sessions by source and destionation fib. if one of the fibs gets removed this grouping is tagged as expired and session won't be passed to non existing fib table Ticket: VPPSUPP-93 Type: improvement Change-Id: I45b1205a8b58d91f174e6feb862554ec2f6cffad Signed-off-by: Filip Varga <fivarga@cisco.com>
Diffstat (limited to 'src/plugins/ikev2')
0 files changed, 0 insertions, 0 deletions
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/*
 * 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/cop/cop.h>
#include <vnet/fib/ip4_fib.h>
#include <vnet/dpo/load_balance.h>

typedef struct {
  u32 next_index;
  u32 sw_if_index;
} ip4_cop_whitelist_trace_t;

/* packet trace format function */
static u8 * format_ip4_cop_whitelist_trace (u8 * s, va_list * args)
{
  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  ip4_cop_whitelist_trace_t * t = va_arg (*args, ip4_cop_whitelist_trace_t *);
  
  s = format (s, "IP4_COP_WHITELIST: sw_if_index %d, next index %d",
              t->sw_if_index, t->next_index);
  return s;
}

vlib_node_registration_t ip4_cop_whitelist_node;

#define foreach_ip4_cop_whitelist_error                         \
_(DROPPED, "ip4 cop whitelist packets dropped")

typedef enum {
#define _(sym,str) IP4_COP_WHITELIST_ERROR_##sym,
  foreach_ip4_cop_whitelist_error
#undef _
  IP4_COP_WHITELIST_N_ERROR,
} ip4_cop_whitelist_error_t;

static char * ip4_cop_whitelist_error_strings[] = {
#define _(sym,string) string,
  foreach_ip4_cop_whitelist_error
#undef _
};

static uword
ip4_cop_whitelist_node_fn (vlib_main_t * vm,
		  vlib_node_runtime_t * node,
		  vlib_frame_t * frame)
{
  u32 n_left_from, * from, * to_next;
  cop_feature_type_t next_index;
  cop_main_t *cm = &cop_main;
  vlib_combined_counter_main_t * vcm = &load_balance_main.lbm_via_counters;
  u32 thread_index = vm->thread_index;

  from = vlib_frame_vector_args (frame);
  n_left_from = frame->n_vectors;
  next_index = node->cached_next_index;

  while (n_left_from > 0)
    {
      u32 n_left_to_next;

      vlib_get_next_frame (vm, node, next_index,
			   to_next, n_left_to_next);

      while (n_left_from >= 4 && n_left_to_next >= 2)
      	{
          u32 bi0, bi1;
          vlib_buffer_t * b0, * b1;
          u32 next0, next1;
          u32 sw_if_index0, sw_if_index1;
          ip4_header_t * ip0, * ip1;
          cop_config_main_t * ccm0, * ccm1;
          cop_config_data_t * c0, * c1;
      	  ip4_fib_mtrie_t * mtrie0, * mtrie1;
      	  ip4_fib_mtrie_leaf_t leaf0, leaf1;
          u32 lb_index0, lb_index1;
          const load_balance_t * lb0, *lb1;
          const dpo_id_t *dpo0, *dpo1;

      	  /* Prefetch next iteration. */
      	  {
      	    vlib_buffer_t * p2, * p3;
            
      	    p2 = vlib_get_buffer (vm, from[2]);
      	    p3 = vlib_get_buffer (vm, from[3]);
            
      	    vlib_prefetch_buffer_header (p2, LOAD);
      	    vlib_prefetch_buffer_header (p3, LOAD);

      	    CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
      	    CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
      	  }

          /* speculatively enqueue b0 and b1 to the current next frame */
      	  to_next[0] = bi0 = from[0];
      	  to_next[1] = bi1 = from[1];
      	  from += 2;
      	  to_next += 2;
      	  n_left_from -= 2;
      	  n_left_to_next -= 2;

      	  b0 = vlib_get_buffer (vm, bi0);
          sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];

      	  ip0 = vlib_buffer_get_current (b0);

      	  ccm0 = cm->cop_config_mains + VNET_COP_IP4;

      	  c0 = vnet_get_config_data
              (&ccm0->config_main,
               &vnet_buffer (b0)->cop.current_config_index,
               &next0,
               sizeof (c0[0]));

	  mtrie0 = &ip4_fib_get (c0->fib_index)->mtrie;

          leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);

      	  leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0,
                                             &ip0->src_address, 2);

      	  leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0,
                                             &ip0->src_address, 3);

      	  lb_index0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);

	  ASSERT (lb_index0
                  == ip4_fib_table_lookup_lb (ip4_fib_get(c0->fib_index),
	  				       &ip0->src_address));
	  lb0 = load_balance_get (lb_index0);
          dpo0 = load_balance_get_bucket_i(lb0, 0);

          if (PREDICT_FALSE(dpo0->dpoi_type != DPO_RECEIVE))
            {
              b0->error = node->errors[IP4_COP_WHITELIST_ERROR_DROPPED];
              next0 = RX_COP_DROP;
            }

      	  b1 = vlib_get_buffer (vm, bi1);
          sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_RX];

      	  ip1 = vlib_buffer_get_current (b1);

      	  ccm1 = cm->cop_config_mains + VNET_COP_IP4;

      	  c1 = vnet_get_config_data
              (&ccm1->config_main,
               &vnet_buffer (b1)->cop.current_config_index,
               &next1,
               sizeof (c1[0]));
	  mtrie1 = &ip4_fib_get (c1->fib_index)->mtrie;

          leaf1 = ip4_fib_mtrie_lookup_step_one (mtrie1, &ip1->src_address);

      	  leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1,
                                             &ip1->src_address, 2);

      	  leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1,
                                             &ip1->src_address, 3);

      	  lb_index1 = ip4_fib_mtrie_leaf_get_adj_index (leaf1);
	  ASSERT (lb_index1
                  == ip4_fib_table_lookup_lb (ip4_fib_get(c1->fib_index),
	  				       &ip1->src_address));
	  lb1 = load_balance_get (lb_index1);
          dpo1 = load_balance_get_bucket_i(lb1, 0);

          vlib_increment_combined_counter
              (vcm, thread_index, lb_index0, 1,
               vlib_buffer_length_in_chain (vm, b0)
               + sizeof(ethernet_header_t));

          vlib_increment_combined_counter
              (vcm, thread_index, lb_index1, 1,
               vlib_buffer_length_in_chain (vm, b1)
               + sizeof(ethernet_header_t));


          if (PREDICT_FALSE(dpo1->dpoi_type != DPO_RECEIVE))
            {
              b1->error = node->errors[IP4_COP_WHITELIST_ERROR_DROPPED];
              next1 = RX_COP_DROP;
            }

          if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
                            && (b0->flags & VLIB_BUFFER_IS_TRACED)))
            {
              ip4_cop_whitelist_trace_t *t =
                 vlib_add_trace (vm, node, b0, sizeof (*t));
              t->sw_if_index = sw_if_index0;
              t->next_index = next0;
            }

          if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
                            && (b1->flags & VLIB_BUFFER_IS_TRACED)))
            {
              ip4_cop_whitelist_trace_t *t =
                 vlib_add_trace (vm, node, b1, sizeof (*t));
              t->sw_if_index = sw_if_index1;
              t->next_index = next1;
            }

          /* verify speculative enqueues, maybe switch current next frame */
          vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
                                           to_next, n_left_to_next,
                                           bi0, bi1, next0, next1);
        }

      while (n_left_from > 0 && n_left_to_next > 0)
	{
          u32 bi0;
	  vlib_buffer_t * b0;
          u32 next0;
          u32 sw_if_index0;
          ip4_header_t * ip0;
          cop_config_main_t *ccm0;
          cop_config_data_t *c0;
	  ip4_fib_mtrie_t * mtrie0;
	  ip4_fib_mtrie_leaf_t leaf0;
          u32 lb_index0;
          const load_balance_t * lb0;
          const dpo_id_t *dpo0;

          /* speculatively enqueue b0 to the current next frame */
	  bi0 = from[0];
	  to_next[0] = bi0;
	  from += 1;
	  to_next += 1;
	  n_left_from -= 1;
	  n_left_to_next -= 1;

	  b0 = vlib_get_buffer (vm, bi0);
          sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];

	  ip0 = vlib_buffer_get_current (b0);

	  ccm0 = cm->cop_config_mains + VNET_COP_IP4;

	  c0 = vnet_get_config_data 
              (&ccm0->config_main,
               &vnet_buffer (b0)->cop.current_config_index,
               &next0,
               sizeof (c0[0]));

	  mtrie0 = &ip4_fib_get (c0->fib_index)->mtrie;

          leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);

	  leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, 
                                             &ip0->src_address, 2);

	  leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, 
                                             &ip0->src_address, 3);

	  lb_index0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);

	  ASSERT (lb_index0 
                  == ip4_fib_table_lookup_lb (ip4_fib_get(c0->fib_index),
					      &ip0->src_address));

	  lb0 = load_balance_get (lb_index0);
          dpo0 = load_balance_get_bucket_i(lb0, 0);

          vlib_increment_combined_counter 
              (vcm, thread_index, lb_index0, 1,
               vlib_buffer_length_in_chain (vm, b0) 
               + sizeof(ethernet_header_t));

          if (PREDICT_FALSE(dpo0->dpoi_type != DPO_RECEIVE))
            {
              b0->error = node->errors[IP4_COP_WHITELIST_ERROR_DROPPED];
              next0 = RX_COP_DROP;
            }

          if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE) 
                            && (b0->flags & VLIB_BUFFER_IS_TRACED))) 
            {
              ip4_cop_whitelist_trace_t *t = 
                 vlib_add_trace (vm, node, b0, sizeof (*t));
              t->sw_if_index = sw_if_index0;
              t->next_index = next0;
            }
            
          /* verify speculative enqueue, maybe switch current next frame */
	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
					   to_next, n_left_to_next,
					   bi0, next0);
	}

      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
    }
  return frame->n_vectors;
}

VLIB_REGISTER_NODE (ip4_cop_whitelist_node) = {
  .function = ip4_cop_whitelist_node_fn,
  .name = "ip4-cop-whitelist",
  .vector_size = sizeof (u32),
  .format_trace = format_ip4_cop_whitelist_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,
  
  .n_errors = ARRAY_LEN(ip4_cop_whitelist_error_strings),
  .error_strings = ip4_cop_whitelist_error_strings,

  .n_next_nodes = COP_RX_N_FEATURES,

  /* edit / add dispositions here */
  .next_nodes = {
    [IP4_RX_COP_WHITELIST] = "ip4-cop-whitelist",
    [IP6_RX_COP_WHITELIST] = "ip6-cop-whitelist",
    [DEFAULT_RX_COP_WHITELIST] = "default-cop-whitelist",
    [IP4_RX_COP_INPUT] = "ip4-input",
    [IP6_RX_COP_INPUT] = "ip6-input",
    [DEFAULT_RX_COP_INPUT] = "ethernet-input",
    [RX_COP_DROP] = "error-drop",
  },
};

VLIB_NODE_FUNCTION_MULTIARCH (ip4_cop_whitelist_node, ip4_cop_whitelist_node_fn)

static clib_error_t *
ip4_whitelist_init (vlib_main_t * vm)
{
  return 0;
}

VLIB_INIT_FUNCTION (ip4_whitelist_init);