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unix: implement L2TPIP socket address on Linux

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Add constants and types to support IP-encapsulated L2TP/RFC3931
tunnels on Linux systems.

The L2TP subsystem for IP encapsulated tunnels hooks into the inet
kernel code using a specific IP protocol value.  In order to handle
this, anyToSockaddr now has to query the socket protocol type using
GetsockoptInt for the AF_INET and AF_INET6 address families.

Although this change is reasonably simple, unit tests have been added
to validate handling of the new types.

Fixes golang/go#37787

Change-Id: I16ae1e24dcced4ccc6ce6a79a90a5a2f6a560967
GitHub-Last-Rev: ca554ad1b6d3a5e55c70f05cf0e542968fa2418c
GitHub-Pull-Request: golang/sys#60
Reviewed-on: https://go-review.googlesource.com/c/sys/+/223157
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Tom Parkin
2020-03-16 20:21:46 +00:00
committed by Ian Lance Taylor
parent 5c8b2ff675
commit 9a0dfc3c55
6 changed files with 295 additions and 21 deletions
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unix/mkerrors.sh
+5
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@@ -280,6 +280,11 @@ struct ltchars {
// for the tipc_subscr timeout __u32 field.
#undef TIPC_WAIT_FOREVER
#define TIPC_WAIT_FOREVER 0xffffffff
// Copied from linux/l2tp.h
// Including linux/l2tp.h here causes conflicts between linux/in.h
// and netinet/in.h included via net/route.h above.
#define IPPROTO_L2TP 115
'
includes_NetBSD='