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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.
*/
/*
* pcap.h: libpcap packet capture format
*
* Copyright (c) 2008 Eliot Dresselhaus
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/**
* @file
* @brief PCAP utility definitions
*/
#ifndef included_vnet_pcap_h
#define included_vnet_pcap_h
#include <vlib/vlib.h>
/**
* @brief Packet types supported by PCAP
*
* null 0
* ethernet 1
* ppp 9
* ip 12
* hdlc 104
*/
#define foreach_vnet_pcap_packet_type \
_ (null, 0) \
_ (ethernet, 1) \
_ (ppp, 9) \
_ (ip, 12) \
_ (hdlc, 104)
typedef enum
{
#define _(f,n) PCAP_PACKET_TYPE_##f = (n),
foreach_vnet_pcap_packet_type
#undef _
} pcap_packet_type_t;
#define foreach_pcap_file_header \
/** 0xa1b2c3d4 host byte order. \
0xd4c3b2a1 => need to byte swap everything. */ \
_ (u32, magic) \
\
/** Currently major 2 minor 4. */ \
_ (u16, major_version) \
_ (u16, minor_version) \
\
/** 0 for GMT. */ \
_ (u32, time_zone) \
\
/** Accuracy of timestamps. Typically set to 0. */ \
_ (u32, sigfigs) \
\
/** Size of largest packet in file. */ \
_ (u32, max_packet_size_in_bytes) \
\
/** One of vnet_pcap_packet_type_t. */ \
_ (u32, packet_type)
/** File header struct */
typedef struct
{
#define _(t, f) t f;
foreach_pcap_file_header
#undef _
} pcap_file_header_t;
#define foreach_pcap_packet_header \
/** Time stamp in seconds */ \
_ (u32, time_in_sec) \
/** Time stamp in microseconds. */ \
_ (u32, time_in_usec) \
\
/** Number of bytes stored in file. */ \
_ (u32, n_packet_bytes_stored_in_file) \
/** Number of bytes in actual packet. */ \
_ (u32, n_bytes_in_packet)
/** Packet header. */
typedef struct
{
#define _(t, f) t f;
foreach_pcap_packet_header
#undef _
/** Packet data follows. */
u8 data[0];
} pcap_packet_header_t;
/**
* @brief PCAP main state data structure
*/
typedef struct
{
/** spinlock to protect e.g. pcap_data */
clib_spinlock_t lock;
/** File name of pcap output. */
char *file_name;
/** Number of packets to capture. */
u32 n_packets_to_capture;
/** Packet type */
pcap_packet_type_t packet_type;
/** Number of packets currently captured. */
u32 n_packets_captured;
/** flags */
u32 flags;
#define PCAP_MAIN_INIT_DONE (1 << 0)
/** File descriptor for reading/writing. */
int file_descriptor;
/** Bytes written */
u32 n_pcap_data_written;
/** Vector of pcap data. */
u8 *pcap_data;
/** Packets read from file. */
u8 **packets_read;
/** Timestamps */
u64 *timestamps;
/** Min/Max Packet bytes */
u32 min_packet_bytes, max_packet_bytes;
} pcap_main_t;
/** 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);
/**
* @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,
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_vnet_pcap_h */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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