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| author |   Peter Oskolkov <posk@google.com> | 2018-12-12 13:15:34 -0800 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-12-14 15:55:20 -0800 |
| commit | 23b0269e58aee1165133b9696e43992f969b5088 (patch) | |
| tree | 0f35b0e22da71c251ee338e0d00b80b8c1c62e7d /net/ipv4/inet_hashtables.c | |
| parent | net: udp: prefer listeners bound to an address (diff) | |
| download | linux-dev-23b0269e58aee1165133b9696e43992f969b5088.tar.xz linux-dev-23b0269e58aee1165133b9696e43992f969b5088.zip | |
net: udp6: prefer listeners bound to an address
A relatively common use case is to have several IPs configured
on a host, and have different listeners for each of them. We would
like to add a "catch all" listener on addr_any, to match incoming
connections not served by any of the listeners bound to a specific
address.
However, port-only lookups can match addr_any sockets when sockets
listening on specific addresses are present if so_reuseport flag
is set. This patch eliminates lookups into port-only hashtable,
as lookups by (addr,port) tuple are easily available.
In addition, compute_score() is tweaked to _not_ match
addr_any sockets to specific addresses, as hash collisions
could result in the unwanted behavior described above.
Tested: the patch compiles; full test in the last patch in this
patchset. Existing reuseport_* selftests also pass.
Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Peter Oskolkov <posk@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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