From 94502fa15e0b7386318e4a7dad78ea05462010d0 Mon Sep 17 00:00:00 2001 From: Laurent Vivier Date: Wed, 6 Mar 2024 16:58:30 +1100 Subject: pcap: add pcap_iov() Introduce a new function pcap_iov() to capture packet desribed by an IO vector. Update pcap_frame() to manage iovcnt > 1. Signed-off-by: Laurent Vivier Reviewed-by: David Gibson Message-ID: <20240303135114.1023026-2-lvivier@redhat.com> [dwg: Fixed trivial cppcheck regressions] Signed-off-by: David Gibson Signed-off-by: Stefano Brivio --- pcap.c | 27 +++++++++++++++++++++++---- 1 file changed, 23 insertions(+), 4 deletions(-) (limited to 'pcap.c') diff --git a/pcap.c b/pcap.c index a4057b5..a0f01ad 100644 --- a/pcap.c +++ b/pcap.c @@ -32,6 +32,7 @@ #include "passt.h" #include "log.h" #include "pcap.h" +#include "iov.h" #define PCAP_VERSION_MINOR 4 @@ -78,7 +79,7 @@ struct pcap_pkthdr { static void pcap_frame(const struct iovec *iov, size_t iovcnt, size_t offset, const struct timeval *tv) { - size_t len = iov->iov_len - offset; + size_t len = iov_size(iov, iovcnt) - offset; struct pcap_pkthdr h = { .tv_sec = tv->tv_sec, .tv_usec = tv->tv_usec, @@ -87,10 +88,8 @@ static void pcap_frame(const struct iovec *iov, size_t iovcnt, }; struct iovec hiov = { &h, sizeof(h) }; - (void)iovcnt; - if (write_remainder(pcap_fd, &hiov, 1, 0) < 0 || - write_remainder(pcap_fd, iov, 1, offset) < 0) { + write_remainder(pcap_fd, iov, iovcnt, offset) < 0) { debug("Cannot log packet, length %zu: %s", len, strerror(errno)); } @@ -135,6 +134,26 @@ void pcap_multiple(const struct iovec *iov, size_t frame_parts, unsigned int n, pcap_frame(iov + i * frame_parts, frame_parts, offset, &tv); } +/* + * pcap_iov - Write packet data described by an I/O vector + * to a pcap file descriptor. + * + * @iov: Pointer to the array of struct iovec describing the I/O vector + * containing packet data to write, including L2 header + * @iovcnt: Number of buffers (@iov entries) + */ +/* cppcheck-suppress unusedFunction */ +void pcap_iov(const struct iovec *iov, size_t iovcnt) +{ + struct timeval tv; + + if (pcap_fd == -1) + return; + + gettimeofday(&tv, NULL); + pcap_frame(iov, iovcnt, 0, &tv); +} + /** * pcap_init() - Initialise pcap file * @c: Execution context -- cgit v1.2.3