unix: implement L2TPIP socket address on Linux

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>
6 files changed
tree: 41899e27fe3fa8412cb1dbbc90d88aee33d40a92
  1. .gitattributes
  2. .gitignore
  3. AUTHORS
  4. CONTRIBUTING.md
  5. CONTRIBUTORS
  6. LICENSE
  7. PATENTS
  8. README.md
  9. codereview.cfg
  10. cpu/
  11. go.mod
  12. plan9/
  13. unix/
  14. windows/
README.md

sys

This repository holds supplemental Go packages for low-level interactions with the operating system.

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