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