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+.\" Copyright (c) 2008 by Gerrit Renker <gerrit@erg.abdn.ac.uk>
+.\"
+.\" SPDX-License-Identifier: Linux-man-pages-copyleft
+.\"
+.\" $Id: udplite.7,v 1.12 2008/07/23 15:22:22 gerrit Exp gerrit $
+.\"
+.TH udplite 7 2023-02-10 "Linux man-pages 6.04"
+.SH NAME
+udplite \- Lightweight User Datagram Protocol
+.SH SYNOPSIS
+.nf
+.B #include <sys/socket.h>
+.\" FIXME . see #defines under `BUGS',
+.\"        when glibc supports this, add
+.\"        #include <netinet/udplite.h>
+.PP
+.B sockfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDPLITE);
+.fi
+.SH DESCRIPTION
+This is an implementation of the Lightweight User Datagram Protocol
+(UDP-Lite), as described in RFC\ 3828.
+.PP
+UDP-Lite is an extension of UDP (RFC\ 768) to support variable-length
+checksums.
+This has advantages for some types of multimedia transport that
+may be able to make use of slightly damaged datagrams,
+rather than having them discarded by lower-layer protocols.
+.PP
+The variable-length checksum coverage is set via a
+.BR setsockopt (2)
+option.
+If this option is not set, the only difference from UDP is
+in using a different IP protocol identifier (IANA number 136).
+.PP
+The UDP-Lite implementation is a full extension of
+.BR udp (7)\[em]that
+is, it shares the same API and API behavior, and in addition
+offers two socket options to control the checksum coverage.
+.SS Address format
+UDP-Litev4 uses the
+.I sockaddr_in
+address format described in
+.BR ip (7).
+UDP-Litev6 uses the
+.I sockaddr_in6
+address format described in
+.BR ipv6 (7).
+.SS Socket options
+To set or get a UDP-Lite socket option, call
+.BR getsockopt (2)
+to read or
+.BR setsockopt (2)
+to write the option with the option level argument set to
+.BR IPPROTO_UDPLITE .
+In addition, all
+.B IPPROTO_UDP
+socket options are valid on a UDP-Lite socket.
+See
+.BR udp (7)
+for more information.
+.PP
+The following two options are specific to UDP-Lite.
+.TP
+.B UDPLITE_SEND_CSCOV
+This option sets the sender checksum coverage and takes an
+.I int
+as argument, with a checksum coverage value in the range 0..2\[ha]16-1.
+.IP
+A value of 0 means that the entire datagram is always covered.
+Values from 1\-7 are illegal (RFC\ 3828, 3.1) and are rounded up to
+the minimum coverage of 8.
+.IP
+With regard to IPv6 jumbograms (RFC\ 2675), the UDP-Litev6 checksum
+coverage is limited to the first 2\[ha]16-1 octets, as per RFC\ 3828, 3.5.
+Higher values are therefore silently truncated to 2\[ha]16-1.
+If in doubt, the current coverage value can always be queried using
+.BR getsockopt (2).
+.TP
+.B UDPLITE_RECV_CSCOV
+This is the receiver-side analogue and uses the same argument format
+and value range as
+.BR UDPLITE_SEND_CSCOV .
+This option is not required to enable traffic with partial checksum
+coverage.
+Its function is that of a traffic filter: when enabled, it
+instructs the kernel to drop all packets which have a coverage
+.I less
+than the specified coverage value.
+.IP
+When the value of
+.B UDPLITE_RECV_CSCOV
+exceeds the actual packet coverage, incoming packets are silently dropped,
+but may generate a warning message in the system log.
+.\" SO_NO_CHECK exists and is supported by UDPv4, but is
+.\" commented out in socket(7), hence also commented out here
+.\".PP
+.\"Since UDP-Lite mandates checksums, checksumming can not be disabled
+.\"via the
+.\".B SO_NO_CHECK
+.\"option from
+.\".BR socket (7).
+.SH ERRORS
+All errors documented for
+.BR udp (7)
+may be returned.
+UDP-Lite does not add further errors.
+.SH FILES
+.TP
+.I /proc/net/snmp
+Basic UDP-Litev4 statistics counters.
+.TP
+.I /proc/net/snmp6
+Basic UDP-Litev6 statistics counters.
+.SH VERSIONS
+UDP-Litev4/v6 first appeared in Linux 2.6.20.
+.SH BUGS
+.\" FIXME . remove this section once glibc supports UDP-Lite
+Where glibc support is missing, the following definitions are needed:
+.PP
+.in +4n
+.EX
+#define IPPROTO_UDPLITE     136
+.\" The following two are defined in the kernel in linux/net/udplite.h
+#define UDPLITE_SEND_CSCOV  10
+#define UDPLITE_RECV_CSCOV  11
+.EE
+.in
+.SH SEE ALSO
+.BR ip (7),
+.BR ipv6 (7),
+.BR socket (7),
+.BR udp (7)
+.PP
+RFC\ 3828 for the Lightweight User Datagram Protocol (UDP-Lite).
+.PP
+.I Documentation/networking/udplite.txt
+in the Linux kernel source tree