Put more information into the comments for "pcap_stats()".
This commit is contained in:
guy
parent
4ad66bbfb4
commit
efc02fd2e3
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@ -20,7 +20,7 @@
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*/
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/libpcap/pcap-bpf.c,v 1.47 2001-11-17 21:24:09 guy Exp $ (LBL)";
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"@(#) $Header: /tcpdump/master/libpcap/pcap-bpf.c,v 1.48 2001-12-10 07:14:14 guy Exp $ (LBL)";
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#endif
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#ifdef HAVE_CONFIG_H
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@ -69,12 +69,16 @@ pcap_stats(pcap_t *p, struct pcap_stat *ps)
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/*
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* "ps_recv" counts packets handed to the filter, not packets
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* that passed the filter.
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* that passed the filter. This includes packets later dropped
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* because we ran out of buffer space.
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*
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* "ps_drop" counts packets dropped inside the BPF device
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* because we ran out of buffer space. It doesn't count
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* packets dropped by the interface driver. It counts
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* only packets that passed the filter.
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*
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* Both statistics include packets not yet read from the kernel
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* by libpcap, and thus not yet seen by the application.
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*/
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if (ioctl(p->fd, BIOCGSTATS, (caddr_t)&s) < 0) {
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snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCGSTATS: %s",
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10
pcap-dlpi.c
10
pcap-dlpi.c
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@ -38,7 +38,7 @@
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/libpcap/pcap-dlpi.c,v 1.73 2001-11-17 21:07:59 guy Exp $ (LBL)";
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"@(#) $Header: /tcpdump/master/libpcap/pcap-dlpi.c,v 1.74 2001-12-10 07:14:15 guy Exp $ (LBL)";
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#endif
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#ifdef HAVE_CONFIG_H
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@ -130,7 +130,9 @@ pcap_stats(pcap_t *p, struct pcap_stat *ps)
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/*
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* "ps_recv" counts packets handed to the filter, not packets
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* that passed the filter.
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* that passed the filter. As filtering is done in userland,
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* this does not include packets dropped because we ran out
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* of buffer space.
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*
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* "ps_drop" counts packets dropped inside the DLPI service
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* provider device device because of flow control requirements
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@ -138,6 +140,10 @@ pcap_stats(pcap_t *p, struct pcap_stat *ps)
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* the interface driver, or packets dropped upstream. As
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* filtering is done in userland, it counts packets regardless
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* of whether they would've passed the filter.
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*
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* These statistics don't include packets not yet read from
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* the kernel by libpcap, but they may include packets not
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* yet read from libpcap by the application.
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*/
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*ps = p->md.stat;
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return (0);
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36
pcap-linux.c
36
pcap-linux.c
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@ -26,7 +26,7 @@
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*/
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/libpcap/pcap-linux.c,v 1.72 2001-12-10 05:49:40 guy Exp $ (LBL)";
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"@(#) $Header: /tcpdump/master/libpcap/pcap-linux.c,v 1.73 2001-12-10 07:14:16 guy Exp $ (LBL)";
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#endif
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/*
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@ -657,11 +657,6 @@ pcap_stats(pcap_t *handle, struct pcap_stat *stats)
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* platforms, but the best approximation is to return
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* "tp_packets" as the count of packets and "tp_drops"
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* as the count of drops.
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*
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* Note that "tp_packets" may include packets not yet
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* processed by libpcap; the packets may have been
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* queued on the socket but not read yet. (The equivalent
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* may be true on other platforms.)
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*/
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handle->md.stat.ps_recv = kstats.tp_packets;
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handle->md.stat.ps_drop = kstats.tp_drops;
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@ -683,10 +678,33 @@ pcap_stats(pcap_t *handle, struct pcap_stat *stats)
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}
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#endif
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/*
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* "ps_recv" counts only packets that passed the filter.
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* On systems where the PACKET_STATISTICS "getsockopt()" argument
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* is supported on PF_PACKET sockets:
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*
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* "ps_drop" is maintained only on systems that support
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* the PACKET_STATISTICS "getsockopt()" argument.
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* "ps_recv" counts only packets that *passed* the filter,
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* not packets that didn't pass the filter. This includes
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* packets later dropped because we ran out of buffer space.
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*
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* "ps_drop" counts packets dropped because we ran out of
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* buffer space. It doesn't count packets dropped by the
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* interface driver. It counts only packets that passed
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* the filter.
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*
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* Both statistics include packets not yet read from the
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* kernel by libpcap, and thus not yet seen by the application.
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*
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* On systems where the PACKET_STATISTICS "getsockopt()" argument
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* is not supported on PF_PACKET sockets:
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*
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* "ps_recv" counts only packets that *passed* the filter,
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* not packets that didn't pass the filter. It does not
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* count packets dropped because we ran out of buffer
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* space.
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*
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* "ps_drop" is not supported.
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*
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* "ps_recv" doesn't include packets not yet read from
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* the kernel by libpcap.
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*/
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*stats = handle->md.stat;
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return 0;
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10
pcap-nit.c
10
pcap-nit.c
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@ -20,7 +20,7 @@
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*/
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/libpcap/pcap-nit.c,v 1.40 2001-07-29 01:22:41 guy Exp $ (LBL)";
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"@(#) $Header: /tcpdump/master/libpcap/pcap-nit.c,v 1.41 2001-12-10 07:14:18 guy Exp $ (LBL)";
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#endif
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#ifdef HAVE_CONFIG_H
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@ -77,13 +77,19 @@ pcap_stats(pcap_t *p, struct pcap_stat *ps)
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/*
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* "ps_recv" counts packets handed to the filter, not packets
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* that passed the filter.
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* that passed the filter. As filtering is done in userland,
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* this does not include packets dropped because we ran out
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* of buffer space.
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*
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* "ps_drop" presumably counts packets dropped by the socket
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* because of flow control requirements or resource exhaustion;
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* it doesn't count packets dropped by the interface driver.
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* As filtering is done in userland, it counts packets regardless
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* of whether they would've passed the filter.
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*
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* These statistics don't include packets not yet read from the
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* kernel by libpcap or packets not yet read from libpcap by the
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* application.
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*/
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*ps = p->md.stat;
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return (0);
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42
pcap-pf.c
42
pcap-pf.c
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@ -24,7 +24,7 @@
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/libpcap/pcap-pf.c,v 1.64 2001-07-29 01:22:42 guy Exp $ (LBL)";
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"@(#) $Header: /tcpdump/master/libpcap/pcap-pf.c,v 1.65 2001-12-10 07:14:19 guy Exp $ (LBL)";
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#endif
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#ifdef HAVE_CONFIG_H
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@ -196,16 +196,40 @@ pcap_stats(pcap_t *p, struct pcap_stat *ps)
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{
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/*
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* "ps_recv" counts only packets that passed the filter.
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* If packet filtering is being done in the kernel:
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*
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* "ps_drop" counts packets that passed the kernel filter
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* (if any) but were dropped because the input queue was
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* full. It counts packets regardless of whether they would
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* have passed a userland filter.
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* "ps_recv" counts only packets that passed the filter.
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* This does not include packets dropped because we
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* ran out of buffer space. (XXX - perhaps it should,
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* by adding "ps_drop" to "ps_recv", for compatibility
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* with some other platforms. On the other hand, on
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* some platforms "ps_recv" counts only packets that
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* passed the filter, and on others it counts packets
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* that didn't pass the filter....)
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*
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* "ps_ifdrop" counts packets dropped by the network
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* inteface (regardless of whether they would have passed
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* the input filter, of course).
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* "ps_drop" counts packets that passed the kernel filter
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* (if any) but were dropped because the input queue was
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* full.
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*
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* "ps_ifdrop" counts packets dropped by the network
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* inteface (regardless of whether they would have passed
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* the input filter, of course).
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*
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* If packet filtering is not being done in the kernel:
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*
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* "ps_recv" counts only packets that passed the filter.
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*
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* "ps_drop" counts packets that were dropped because the
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* input queue was full, regardless of whether they passed
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* the userland filter.
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*
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* "ps_ifdrop" counts packets dropped by the network
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* inteface (regardless of whether they would have passed
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* the input filter, of course).
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*
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* These statistics don't include packets not yet read from
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* the kernel by libpcap, but they may include packets not
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* yet read from libpcap by the application.
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*/
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ps->ps_recv = p->md.TotAccepted;
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ps->ps_drop = p->md.TotDrops;
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10
pcap-snit.c
10
pcap-snit.c
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@ -25,7 +25,7 @@
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/libpcap/pcap-snit.c,v 1.55 2001-07-29 01:22:42 guy Exp $ (LBL)";
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"@(#) $Header: /tcpdump/master/libpcap/pcap-snit.c,v 1.56 2001-12-10 07:14:20 guy Exp $ (LBL)";
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#endif
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#ifdef HAVE_CONFIG_H
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@ -90,7 +90,9 @@ pcap_stats(pcap_t *p, struct pcap_stat *ps)
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/*
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* "ps_recv" counts packets handed to the filter, not packets
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* that passed the filter.
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* that passed the filter. As filtering is done in userland,
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* this does not include packets dropped because we ran out
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* of buffer space.
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*
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* "ps_drop" counts packets dropped inside the "/dev/nit"
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* device because of flow control requirements or resource
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@ -98,6 +100,10 @@ pcap_stats(pcap_t *p, struct pcap_stat *ps)
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* interface driver, or packets dropped upstream. As filtering
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* is done in userland, it counts packets regardless of whether
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* they would've passed the filter.
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*
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* These statistics don't include packets not yet read from the
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* kernel by libpcap or packets not yet read from libpcap by the
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* application.
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*/
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*ps = p->md.stat;
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return (0);
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@ -20,7 +20,7 @@
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*/
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/libpcap/pcap-snoop.c,v 1.32 2001-07-29 01:22:43 guy Exp $ (LBL)";
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"@(#) $Header: /tcpdump/master/libpcap/pcap-snoop.c,v 1.33 2001-12-10 07:14:21 guy Exp $ (LBL)";
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#endif
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#ifdef HAVE_CONFIG_H
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@ -134,6 +134,8 @@ pcap_stats(pcap_t *p, struct pcap_stat *ps)
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/*
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* "ps_recv" counts only packets that passed the filter.
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* As filtering is done in userland, this does not include
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* packets dropped because we ran out of buffer space.
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*/
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*ps = p->md.stat;
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return (0);
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