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/*
* Copyright (c) 2015 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.
*/
#ifndef included_vppinfra_pcap_funcs_h
#define included_vppinfra_pcap_funcs_h
/** Write out data to output file. */
clib_error_t *pcap_write (pcap_main_t * pm);
/** Read data from file. */
clib_error_t *pcap_read (pcap_main_t * pm);
/** Close the file created by pcap_write function. */
clib_error_t *pcap_close (pcap_main_t * pm);
/**
* @brief Add packet
*
* @param *pm - pcap_main_t
* @param time_now - f64
* @param n_bytes_in_trace - u32
* @param n_bytes_in_packet - u32
*
* @return Packet Data
*
*/
static inline void *
pcap_add_packet (pcap_main_t * pm,
f64 time_now, u32 n_bytes_in_trace, u32 n_bytes_in_packet)
{
pcap_packet_header_t *h;
u8 *d;
vec_add2 (pm->pcap_data, d, sizeof (h[0]) + n_bytes_in_trace);
h = (void *) (d);
h->time_in_sec = time_now;
h->time_in_usec = 1e6 * (time_now - h->time_in_sec);
h->n_packet_bytes_stored_in_file = n_bytes_in_trace;
h->n_bytes_in_packet = n_bytes_in_packet;
pm->n_packets_captured++;
return h->data;
}
/**
* @brief Add buffer (vlib_buffer_t) to the trace
*
* @param *pm - pcap_main_t
* @param *vm - vlib_main_t
* @param buffer_index - u32
* @param n_bytes_in_trace - u32
*
*/
static inline void
pcap_add_buffer (pcap_main_t * pm,
struct vlib_main_t *vm, u32 buffer_index,
u32 n_bytes_in_trace)
{
vlib_buffer_t *b = vlib_get_buffer (vm, buffer_index);
u32 n = vlib_buffer_length_in_chain (vm, b);
i32 n_left = clib_min (n_bytes_in_trace, n);
f64 time_now = vlib_time_now (vm);
void *d;
if (PREDICT_TRUE (pm->n_packets_captured < pm->n_packets_to_capture))
{
clib_spinlock_lock_if_init (&pm->lock);
d = pcap_add_packet (pm, time_now, n_left, n);
while (1)
{
u32 copy_length = clib_min ((u32) n_left, b->current_length);
clib_memcpy_fast (d, b->data + b->current_data, copy_length);
n_left -= b->current_length;
if (n_left <= 0)
break;
d += b->current_length;
ASSERT (b->flags & VLIB_BUFFER_NEXT_PRESENT);
b = vlib_get_buffer (vm, b->next_buffer);
}
clib_spinlock_unlock_if_init (&pm->lock);
}
}
#endif /* included_vppinfra_pcap_funcs_h */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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