net: add support for dialing from a custom local address on Plan 9

Make use of the extra parameter on "connect" control message to set the
local IP address and port. The ip(3) man page doesn't document that the
local IP address is settable, but upon inspection of the source code,
it's clearly settable.

Fixes #39747

Change-Id: Ied3d60452f20d6e5af23d1c1dcb34774af0dbd5b
Reviewed-on: https://go-review.googlesource.com/c/go/+/240064
Run-TryBot: David du Colombier <0intro@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David du Colombier <0intro@gmail.com>
1 file changed
tree: 4aafdee8b976429b3f24ccba8b1e2bd65aef1eb0
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
  18. SECURITY.md
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