JDK-8216417 : cleanup of IPv6 scope-id handling
  • Type: Bug
  • Component: core-libs
  • Sub-Component: java.net
  • Affected Version: 13
  • Priority: P4
  • Status: Closed
  • Resolution: Fixed
  • Submitted: 2019-01-09
  • Updated: 2021-09-28
  • Resolved: 2019-06-13
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JDK 11 JDK 13 JDK 14
11.0.13-oracleFixed 13 b25Fixed 14Fixed
Related Reports
Relates :  
JDK-8221481 - Reimplement the Legacy Socket API
Sub Tasks
JDK-8268862 :  
Problem-list java/net/ipv6tests/B6521014.java and java/net/Inet6Address/B6206527.java on MacOS - Resolved
Description
There is a lot of OS specific native code (mostly Linux) around determining which network interface to use when binding/connecting sockets to link-local (LL) IPv6 addresses.

Most of this code can be removed such that:

1. when binding/connecting to a local LL address, a common Java level implementation can check local link-local addresses and supply the scope-id automatically.

2. when connecting to a non local LL address, we can just require the scope-id to be set explicitly, like most native applications. Link-local addresses can sometimes, but not always be determined from routing tables, but it is more reliable to require them to be set by the caller.

This change affects NIO as well classic sockets and fixes a problem on macos where channels could not bind to local link-local addresses without the scope-id being set explicitly.
Comments
Fix request [11u] I downport this for parity with 11.0.13-oracle. I had to resovle a row of files. Changed tests pass. Nightly testing passes.
24-09-2021
Git URL: https://github.com/openjdk/jdk/commit/247a6a2ce4f890252ec256de107c1fc4b898aaf6
21-09-2021
URL: http://hg.openjdk.java.net/jdk/jdk/rev/96c7427456f9 User: michaelm Date: 2019-06-13 08:11:32 +0000
13-06-2019
There is already quite a bit of scope-id magic going on for Linux in NET_InetAddressToSockaddr. So, it probably makes sense to include the Macos specific stuff there as well.
10-01-2019