Commit Graph

14 Commits

Author SHA1 Message Date
Andrey V. Elsukov
aee793eec9 Add GRE-in-UDP encapsulation support as defined in RFC8086.
This GRE-in-UDP encapsulation allows the UDP source port field to be
used as an entropy field for load-balancing of GRE traffic in transit
networks. Also most of multiqueue network cards are able distribute
incoming UDP datagrams to different NIC queues, while very little are
able do this for GRE packets.

When an administrator enables UDP encapsulation with command
`ifconfig gre0 udpencap`, the driver creates kernel socket, that binds
to tunnel source address and after udp_set_kernel_tunneling() starts
receiving of all UDP packets destined to 4754 port. Each kernel socket
maintains list of tunnels with different destination addresses. Thus
when several tunnels use the same source address, they all handled by
single socket.  The IP[V6]_BINDANY socket option is used to be able bind
socket to source address even if it is not yet available in the system.
This may happen on system boot, when gre(4) interface is created before
source address become available. The encapsulation and sending of packets
is done directly from gre(4) into ip[6]_output() without using sockets.

Reviewed by:	eugen
MFC after:	1 month
Relnotes:	yes
Differential Revision:	https://reviews.freebsd.org/D19921
2019-04-24 09:05:45 +00:00
Enji Cooper
193d9e768b sys/modules: normalize .CURDIR-relative paths to SRCTOP
This simplifies make output/logic

Tested with:	`cd sys/modules; make ALL_MODULES=` on amd64
MFC after:	1 month
Sponsored by:	Dell EMC Isilon
2017-03-04 10:10:17 +00:00
Warner Losh
5ec3257602 Clean up a bit of the INET/INET6 mess wrt options. 2015-02-18 15:25:25 +00:00
Warner Losh
668ed8aa02 Use automated MK_INET*_SUPPORT code here as well. 2014-11-18 01:39:23 +00:00
Bjoern A. Zeeb
4dbd7c5dc4 After r274246 make the tree compile again.
gcc requires variables to be initialised in two places.  One of them
is correctly  used only under the same conditional though.

For module builds properly check if the kernel supports INET or INET6,
as otherwise various mips kernels without IPv6 support would fail to build.
2014-11-08 14:41:32 +00:00
Andrey V. Elsukov
f325335caf Overhaul if_gre(4).
Split it into two modules: if_gre(4) for GRE encapsulation and
if_me(4) for minimal encapsulation within IP.

gre(4) changes:
* convert to if_transmit;
* rework locking: protect access to softc with rmlock,
  protect from concurrent ioctls with sx lock;
* correct interface accounting for outgoing datagramms (count only payload size);
* implement generic support for using IPv6 as delivery header;
* make implementation conform to the RFC 2784 and partially to RFC 2890;
* add support for GRE checksums - calculate for outgoing datagramms and check
  for inconming datagramms;
* add support for sending sequence number in GRE header;
* remove support of cached routes. This fixes problem, when gre(4) doesn't
  work at system startup. But this also removes support for having tunnels with
  the same addresses for inner and outer header.
* deprecate support for various GREXXX ioctls, that doesn't used in FreeBSD.
  Use our standard ioctls for tunnels.

me(4):
* implementation conform to RFC 2004;
* use if_transmit;
* use the same locking model as gre(4);

PR:		164475
Differential Revision:	D1023
No objections from:	net@
Relnotes:	yes
Sponsored by:	Yandex LLC
2014-11-07 19:13:19 +00:00
Warner Losh
aeaed50898 Move most of the 15 variations on generating opt_inet.h and
opt_inet6.h into kmod.mk by forcing almost everybody to eat the same
dogfood. While at it, consolidate the opt_bpf.h and opt_mroute.h
targets here too.
2014-08-04 22:37:02 +00:00
Gleb Smirnoff
45c203fce2 Remove AppleTalk support.
AppleTalk was a network transport protocol for Apple Macintosh devices
in 80s and then 90s. Starting with Mac OS X in 2000 the AppleTalk was
a legacy protocol and primary networking protocol is TCP/IP. The last
Mac OS X release to support AppleTalk happened in 2009. The same year
routing equipment vendors (namely Cisco) end their support.

Thus, AppleTalk won't be supported in FreeBSD 11.0-RELEASE.
2014-03-14 06:29:43 +00:00
Yaroslav Tykhiy
822923447e Let modules use the kernel's opt_*.h files if built along with
the kernel by wrapping all targets for fake opt_*.h files in
.if defined(KERNBUILDDIR).  Thus, such fake files won't be
created at all if modules are built with the kernel.

Some modules undergo cleanup like removing unused or unneeded
options or .h files, without which they wouldn't build this way
or the other.

Reviewed by:	ru
Tested by:	no binary changes in modules built alone
Tested on:	i386 sparc64 amd64
2005-10-14 23:30:17 +00:00
Bruce M Simpson
f16770ae7e Fix a bug whereby the physical endpoints of a gre(4) tunnel would not
be printed, if the module were loaded into a kernel which had INET6 enabled.

The gre(4) driver does not use INET6, nor is it specified for IPv6. The
tunnel_status() function in ifconfig(8) is somewhat overzealous and assumes
that all tunnel interfaces speak KAME ifioctls.

This fix follows the path of least resistance, by teaching gre(4) about
the two KAME ifioctls concerned.

PR:	bin/56341
2003-11-14 20:58:00 +00:00
Peter Wemm
3c6b084e96 Finish driving a stake through the heart of netns and the associated
ifdefs scattered around the place - its dead Jim!

The SMB stuff had stolen AF_NS, make it official.
2003-03-05 19:24:24 +00:00
Maxim Sobolev
748bb23dcc Since bpf is no longer an optional component, remove associated ifdef's.
Submitted by:	don't quite remember - the name of the sender disappeared
		with the rest of my inbox. :(
2002-10-02 09:38:17 +00:00
Maxim Sobolev
5da5a16d46 Cosmetics: #define NETATALK --> #define NETATALK 1, so that it is in line with
other #define FOO.
2002-09-10 10:19:03 +00:00
Maxim Sobolev
856af10e6a Add if_gre module glue. 2002-09-06 17:17:33 +00:00