DOKK / manpages / debian 13 / dpdk-doc / rte_pcapng_write_packets.3.en
rte_pcapng.h(3) Library Functions Manual rte_pcapng.h(3)

rte_pcapng.h

#include <stdint.h>
#include <sys/types.h>
#include <rte_mempool.h>


enum rte_pcapng_direction


rte_pcapng_t * rte_pcapng_fdopen (int fd, const char *osname, const char *hardware, const char *appname, const char *comment)
void rte_pcapng_close (rte_pcapng_t *self)
int rte_pcapng_add_interface (rte_pcapng_t *self, uint16_t port, const char *ifname, const char *ifdescr, const char *filter)
struct rte_mbuf * rte_pcapng_copy (uint16_t port_id, uint32_t queue, const struct rte_mbuf *m, struct rte_mempool *mp, uint32_t length, enum rte_pcapng_direction direction, const char *comment)
uint32_t rte_pcapng_mbuf_size (uint32_t length)
ssize_t rte_pcapng_write_packets (rte_pcapng_t *self, struct rte_mbuf *pkts[], uint16_t nb_pkts)
ssize_t rte_pcapng_write_stats (rte_pcapng_t *self, uint16_t port, uint64_t ifrecv, uint64_t ifdrop, const char *comment)

RTE pcapng

Pcapng is an evolution from the pcap format, created to address some of its deficiencies. Namely, the lack of extensibility and inability to store additional information.

For details about the file format see RFC: https://www.ietf.org/id/draft-tuexen-opsawg-pcapng-03.html and https://github.com/pcapng/pcapng/

Definition in file rte_pcapng.h.

Direction flag These should match Enhanced Packet Block flag bits

Definition at line 95 of file rte_pcapng.h.

Write data to existing open file

Parameters

fd file descriptor
osname Optional description of the operating system. Examples: 'Debian 11', 'Windows Server 22'
hardware Optional description of the hardware used to create this file. Examples: 'x86 Virtual Machine'
appname Optional: application name recorded in the pcapng file. Example: 'dpdk-dumpcap 1.0 (DPDK 20.11)'
comment Optional comment to add to file header.

Returns

handle to library, or NULL in case of error (and rte_errno is set).

Close capture file

Parameters

self handle to library

Add interface information to the capture file

Parameters

self The handle to the packet capture file
port The Ethernet port to report stats on.
ifname (optional) Interface name to record in the file. If not specified, name will be constructed from port
ifdescr (optional) Interface description to record in the file.
filter Capture filter to record in the file.

Interfaces must be added to the output file after opening and before any packet record. All ports used in packet capture must be added.

Format an mbuf for writing to file.

Parameters

port_id The Ethernet port on which packet was received or is going to be transmitted.
queue The queue on the Ethernet port where packet was received or is going to be transmitted.
mp The mempool from which the 'clone' mbufs are allocated.
m The mbuf to copy
length The upper limit on bytes to copy. Passing UINT32_MAX means all data (after offset).
direction The direction of the packer: receive, transmit or unknown.
comment Packet comment.

Returns

  • The pointer to the new mbuf formatted for pcapng_write
  • NULL if allocation fails.

Determine optimum mbuf data size.

Parameters

length The largest packet that will be copied.

Returns

The minimum size of mbuf data to handle packet with length bytes. Accounting for required header and trailer fields

Write packets to the capture file.

Packets to be captured are copied by rte_pcapng_copy() and then this function is called to write them to the file.

Warning

Do not pass original mbufs from transmit or receive or file will be invalid pcapng format.

Parameters

self The handle to the packet capture file
pkts The address of an array of nb_pkts pointers to rte_mbuf structures which contain the output packets
nb_pkts The number of packets to write to the file.

Returns

The number of bytes written to file, -1 on failure to write file. The mbuf's in pkts are always freed.

Write an Interface statistics block. For statistics, use 0 if don't know or care to report it. Should be called before closing capture to report results.

Parameters

self The handle to the packet capture file
port The Ethernet port to report stats on.
ifrecv The number of packets received by capture. Optional: use UINT64_MAX if not known.
ifdrop The number of packets missed by the capture process. Optional: use UINT64_MAX if not known.
comment Optional comment to add to statistics.

Returns

number of bytes written to file, -1 on failure to write file

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