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/*
* trace_classify.h - Use the classifier to decide if a packet is traced
*
* Copyright (c) 2019 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 <vlib/vlib.h>
#include <vnet/vnet.h>
#include <vppinfra/error.h>
#include <vnet/classify/vnet_classify.h>
/** @file trace_classify.h
* Use the vpp classifier to decide whether to trace packets
*/
/** @brief vnet_is_packet_traced
* @param vlib_buffer_t *b - packet to classify
* @param int func - 0 => use classifier w/ supplied table index
* @param u32 classify_table_index - classifier table index
* @return 0 => no trace, 1 => trace, -1 => error
*/
static inline int
vnet_is_packet_traced_inline (vlib_buffer_t * b,
u32 classify_table_index, int func)
{
vnet_classify_main_t *vcm = &vnet_classify_main;
vnet_classify_table_t *t;
vnet_classify_entry_t *e;
u64 hash;
/*$$$ add custom classifiers here, if any */
if (func != 0)
return -1;
/* This will happen... */
if (pool_is_free_index (vcm->tables, classify_table_index))
return -1;
/* Get the table */
t = pool_elt_at_index (vcm->tables, classify_table_index);
/* Hash the packet */
hash = vnet_classify_hash_packet (t, vlib_buffer_get_current (b));
/* See if there's a matching entry */
e = vnet_classify_find_entry (t, vlib_buffer_get_current (b), hash,
0 /* time = 0, disables hit-counter */ );
/* Hit means trace the packet... */
if (e)
{
/* Manual hit accounting */
e->hits++;
return 1;
}
/*
* Look for a hit in a less-specific table.
* Performance hint: for this use-case, don't go there.
*/
while (1)
{
/* Most likely, we're done right now */
if (PREDICT_TRUE (t->next_table_index == ~0))
return 0;
t = pool_elt_at_index (vcm->tables, t->next_table_index);
/* Compute hash for this table */
hash = vnet_classify_hash_packet (t, vlib_buffer_get_current (b));
/* See if there's a matching entry */
e = vnet_classify_find_entry (t, vlib_buffer_get_current (b), hash,
0 /* time = 0, disables hit-counter */ );
if (e)
{
/* Manual hit accounting */
e->hits++;
return 1;
}
}
/* NOTREACHED */
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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