0fb6ad528e
Small summary
-------------
o Almost all IPsec releated code was moved into sys/netipsec.
o New kernel modules added: ipsec.ko and tcpmd5.ko. New kernel
option IPSEC_SUPPORT added. It enables support for loading
and unloading of ipsec.ko and tcpmd5.ko kernel modules.
o IPSEC_NAT_T option was removed. Now NAT-T support is enabled by
default. The UDP_ENCAP_ESPINUDP_NON_IKE encapsulation type
support was removed. Added TCP/UDP checksum handling for
inbound packets that were decapsulated by transport mode SAs.
setkey(8) modified to show run-time NAT-T configuration of SA.
o New network pseudo interface if_ipsec(4) added. For now it is
build as part of ipsec.ko module (or with IPSEC kernel).
It implements IPsec virtual tunnels to create route-based VPNs.
o The network stack now invokes IPsec functions using special
methods. The only one header file <netipsec/ipsec_support.h>
should be included to declare all the needed things to work
with IPsec.
o All IPsec protocols handlers (ESP/AH/IPCOMP protosw) were removed.
Now these protocols are handled directly via IPsec methods.
o TCP_SIGNATURE support was reworked to be more close to RFC.
o PF_KEY SADB was reworked:
- now all security associations stored in the single SPI namespace,
and all SAs MUST have unique SPI.
- several hash tables added to speed up lookups in SADB.
- SADB now uses rmlock to protect access, and concurrent threads
can do SA lookups in the same time.
- many PF_KEY message handlers were reworked to reflect changes
in SADB.
- SADB_UPDATE message was extended to support new PF_KEY headers:
SADB_X_EXT_NEW_ADDRESS_SRC and SADB_X_EXT_NEW_ADDRESS_DST. They
can be used by IKE daemon to change SA addresses.
o ipsecrequest and secpolicy structures were cardinally changed to
avoid locking protection for ipsecrequest. Now we support
only limited number (4) of bundled SAs, but they are supported
for both INET and INET6.
o INPCB security policy cache was introduced. Each PCB now caches
used security policies to avoid SP lookup for each packet.
o For inbound security policies added the mode, when the kernel does
check for full history of applied IPsec transforms.
o References counting rules for security policies and security
associations were changed. The proper SA locking added into xform
code.
o xform code was also changed. Now it is possible to unregister xforms.
tdb_xxx structures were changed and renamed to reflect changes in
SADB/SPDB, and changed rules for locking and refcounting.
Reviewed by: gnn, wblock
Obtained from: Yandex LLC
Relnotes: yes
Sponsored by: Yandex LLC
Differential Revision: https://reviews.freebsd.org/D9352
179 lines
4.7 KiB
Groff
179 lines
4.7 KiB
Groff
.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. 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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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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.\" @(#)udp.4 8.1 (Berkeley) 6/5/93
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.\" $FreeBSD$
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.\"
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.Dd February 6, 2017
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.Dt UDP 4
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.Os
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.Sh NAME
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.Nm udp
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.Nd Internet User Datagram Protocol
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.Sh SYNOPSIS
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.In sys/types.h
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.In sys/socket.h
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.In netinet/in.h
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.Ft int
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.Fn socket AF_INET SOCK_DGRAM 0
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.Sh DESCRIPTION
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.Tn UDP
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is a simple, unreliable datagram protocol which is used
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to support the
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.Dv SOCK_DGRAM
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abstraction for the Internet
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protocol family.
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.Tn UDP
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sockets are connectionless, and are
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normally used with the
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.Xr sendto 2
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and
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.Xr recvfrom 2
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calls, though the
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.Xr connect 2
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call may also be used to fix the destination for future
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packets (in which case the
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.Xr recv 2
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or
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.Xr read 2
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and
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.Xr send 2
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or
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.Xr write 2
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system calls may be used).
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.Pp
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.Tn UDP
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address formats are identical to those used by
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.Tn TCP .
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In particular
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.Tn UDP
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provides a port identifier in addition
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to the normal Internet address format.
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Note that the
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.Tn UDP
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port
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space is separate from the
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.Tn TCP
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port space (i.e., a
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.Tn UDP
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port
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may not be
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.Dq connected
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to a
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.Tn TCP
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port).
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In addition broadcast
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packets may be sent (assuming the underlying network supports
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this) by using a reserved
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.Dq broadcast address ;
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this address
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is network interface dependent.
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.Pp
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Options at the
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.Tn IP
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transport level may be used with
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.Tn UDP ;
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see
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.Xr ip 4 .
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.Tn UDP_ENCAP
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socket option may be used at the
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.Tn IPPROTO_UDP
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level to encapsulate
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.Tn ESP
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packets in
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.Tn UDP .
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Only one value is supported for this option:
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.Tn UDP_ENCAP_ESPINUDP
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from RFC 3948, defined in
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.In netinet/udp.h .
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.Sh MIB VARIABLES
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The
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.Nm
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protocol implements a number of variables in the
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.Li net.inet
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branch of the
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.Xr sysctl 3
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MIB.
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.Bl -tag -width UDPCTL_RECVSPACEX
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.It UDPCTL_CHECKSUM
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.Pq udp.checksum
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Enable udp checksums (enabled by default).
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.It UDPCTL_MAXDGRAM
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.Pq udp.maxdgram
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Maximum outgoing UDP datagram size
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.It UDPCTL_RECVSPACE
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.Pq udp.recvspace
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Maximum space for incoming UDP datagrams
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.It udp.log_in_vain
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For all udp datagrams, to ports on which there is no socket
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listening, log the connection attempt (disabled by default).
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.It udp.blackhole
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When a datagram is received on a port where there is no socket
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listening, do not return an ICMP port unreachable message.
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(Disabled by default.
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See
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.Xr blackhole 4 . )
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.El
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.Sh ERRORS
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A socket operation may fail with one of the following errors returned:
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.Bl -tag -width Er
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.It Bq Er EISCONN
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when trying to establish a connection on a socket which
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already has one, or when trying to send a datagram with the destination
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address specified and the socket is already connected;
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.It Bq Er ENOTCONN
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when trying to send a datagram, but
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no destination address is specified, and the socket has not been
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connected;
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.It Bq Er ENOBUFS
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when the system runs out of memory for
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an internal data structure;
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.It Bq Er EADDRINUSE
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when an attempt
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is made to create a socket with a port which has already been
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allocated;
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.It Bq Er EADDRNOTAVAIL
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when an attempt is made to create a
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socket with a network address for which no network interface
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exists.
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.El
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.Sh SEE ALSO
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.Xr getsockopt 2 ,
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.Xr recv 2 ,
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.Xr send 2 ,
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.Xr socket 2 ,
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.Xr blackhole 4 ,
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.Xr inet 4 ,
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.Xr intro 4 ,
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.Xr ip 4 ,
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.Xr udplite 4
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.Sh HISTORY
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The
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.Nm
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protocol appeared in
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.Bx 4.2 .
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