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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 2023-10-31 "Linux man-pages 6.7"
-.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>
-.P
-.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.
-.P
-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.
-.P
-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).
-.P
-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.
-.P
-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
-.\".P
-.\"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:
-.P
-.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)
-.P
-RFC\ 3828 for the Lightweight User Datagram Protocol (UDP-Lite).
-.P
-.I Documentation/networking/udplite.txt
-in the Linux kernel source tree