7bda966394
The dtrace provider for UDP-Lite is modeled after the UDP provider. This fixes the bug that UDP-Lite packets were triggering the UDP provider. Thanks to dteske@ for providing the dwatch module. Reviewed by: dteske@, markj@, rrs@ Relnotes: yes Differential Revision: https://reviews.freebsd.org/D16377
205 lines
6.2 KiB
Groff
205 lines
6.2 KiB
Groff
.\" Copyright (c) 2015 Mark Johnston <markj@FreeBSD.org>
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.\" Copyright (c) 2018 Michael Tuexen <tuexen@FreeBSD.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd August 1, 2018
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.Dt DTRACE_UDPLITE 4
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.Os
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.Sh NAME
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.Nm dtrace_udplite
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.Nd a DTrace provider for tracing events related to the UDP-Lite protocol
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.Sh SYNOPSIS
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.Fn udplite:::receive "pktinfo_t *" "csinfo_t *" "ipinfo_t *" "udplitesinfo_t *" \
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"udpliteinfo_t *"
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.Fn udplite:::send "pktinfo_t *" "csinfo_t *" "ipinfo_t *" "udplitesinfo_t *" \
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"udpliteinfo_t *"
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.Sh DESCRIPTION
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The DTrace
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.Nm udplite
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provider allows users to trace events in the
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.Xr udplite 4
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protocol implementation.
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The
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.Fn udplite:::send
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probe fires whenever the kernel prepares to transmit a UDP-Lite packet, and the
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.Fn udplite:::receive
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probe fires whenever the kernel receives a UDP-Lite packet, unless
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the UDP-Lite header is incomplete,
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the destination port is 0,
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the length field is invalid,
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or the checksum is wrong.
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The arguments to these probes can be used to obtain detailed information about
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the IP and UDP-Lite headers of the corresponding packet.
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.Sh ARGUMENTS
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The
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.Vt pktinfo_t
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argument is currently unimplemented and is included for compatibility with other
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implementations of this provider.
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Its fields are:
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.Bl -tag -width "uintptr_t pkt_addr" -offset indent
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.It Vt uintptr_t pkt_addr
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Always set to 0.
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.El
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.Pp
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The
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.Vt csinfo_t
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argument is currently unimplemented and is included for compatibility with other
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implementations of this provider.
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Its fields are:
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.Bl -tag -width "uintptr_t cs_addr" -offset indent
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.It Vt uintptr_t cs_addr
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Always set to 0.
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.It Vt uint64_t cs_cid
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A pointer to the
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.Vt struct inpcb
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for this packet, or
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.Dv NULL .
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.It Vt pid_t cs_pid
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Always set to 0.
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.El
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.Pp
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The
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.Vt ipinfo_t
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argument contains IP fields common to both IPv4 and IPv6 packets.
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Its fields are:
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.Bl -tag -width "uint32_t ip_plength" -offset indent
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.It Vt uint8_t ip_ver
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IP version of the packet, 4 for IPv4 packets and 6 for IPv6 packets.
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.It Vt uint32_t ip_plength
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IP payload size.
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This does not include the size of the IP header or IPv6 option headers.
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.It Vt string ip_saddr
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IP source address.
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.It Vt string ip_daddr
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IP destination address.
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.El
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.Pp
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The
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.Vt udplitesinfo_t
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argument contains the state of the UDP-Lite connection associated with the packet.
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Its fields are:
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.Bl -tag -width "uintptr_t udplites_addr" -offset indent
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.It Vt uintptr_t udplites_addr
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Pointer to the
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.Vt struct inpcb
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containing the IP state for the associated socket.
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.It Vt uint16_t udplites_lport
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Local UDP-Lite port.
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.It Vt uint16_t udplites_rport
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Remote UDP-Lite port.
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.It Vt string udplites_laddr
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Local IPv4 or IPv6 address.
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.It Vt string udplites_raddr
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Remote IPv4 or IPv6 address.
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.El
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.Pp
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The
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.Vt udpliteinfo_t
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argument is the raw UDP-Lite header of the packet, with all fields in host order.
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Its fields are:
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.Bl -tag -width "struct udplitehdr *udplite_hdr" -offset indent
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.It Vt uint16_t udplite_sport
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Source UDP-Lite port.
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.It Vt uint16_t udplite_dport
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Destination UDP-Lite port.
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.It Vt uint16_t udplite_coverage
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Checksum coverage of the UDP-Lite header, in bytes, or 0 for full coverage.
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.It Vt uint16_t udplite_checksum
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A checksum of the UDP-Lite header and payload, or 0 if no checksum was calculated.
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.It Vt struct udplitehdr *udplite_hdr
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A pointer to the raw UDP-Lite header.
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.El
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.Sh FILES
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.Bl -tag -width "/usr/lib/dtrace/udplite.d" -compact
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.It Pa /usr/lib/dtrace/udplite.d
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DTrace type and translator definitions for the
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.Nm udplite
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provider.
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.El
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.Sh EXAMPLES
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The following script counts transmitted packets by destination port.
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.Bd -literal -offset indent
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udplite:::send
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{
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@num[args[4]->udplite_dport] = count();
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}
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.Ed
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.Pp
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This script will print some details of each UDP-Lite packet as it is sent or received
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by the kernel:
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.Bd -literal -offset indent
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#pragma D option quiet
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#pragma D option switchrate=10Hz
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dtrace:::BEGIN
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{
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printf(" %10s %36s %-36s %6s\\n", "DELTA(us)", "SOURCE",
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"DEST", "COV");
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last = timestamp;
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}
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udplite:::send
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{
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this->elapsed = (timestamp - last) / 1000;
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self->dest = strjoin(strjoin(args[2]->ip_daddr, ":"),
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lltostr(args[4]->udplite_dport));
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printf(" %10d %30s:%-5d -> %-36s %6d\\n", this->elapsed,
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args[2]->ip_saddr, args[4]->udplite_sport,
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self->dest, args[4]->udplite_coverage);
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last = timestamp;
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}
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udplite:::receive
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{
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this->elapsed = (timestamp - last) / 1000;
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self->dest = strjoin(strjoin(args[2]->ip_saddr, ":"),
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lltostr(args[4]->udplite_sport));
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printf(" %10d %30s:%-5d <- %-36s %6d\\n", this->elapsed,
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args[2]->ip_daddr, args[4]->udplite_dport,
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self->dest, args[4]->udplite_coverage);
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last = timestamp;
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}
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.Ed
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.Sh SEE ALSO
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.Xr dtrace 1 ,
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.Xr dtrace_ip 4 ,
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.Xr dtrace_sctp 4 ,
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.Xr dtrace_tcp 4 ,
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.Xr dtrace_udp 4 ,
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.Xr udplite 4 ,
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.Xr SDT 9
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.Sh HISTORY
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The
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.Nm udplite
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provider first appeared in
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.Fx
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12.0.
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.Sh AUTHORS
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This manual page was written by
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.An Mark Johnston Aq Mt markj@FreeBSD.org
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and
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.An Michael Tuexen Aq Mt tuexen@FreeBSD.org .
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