netdev - [PATCH v2 net-next 0/3] Improve bind(addr, 0) behaviour.

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Date:   Wed, 26 Feb 2020 16:46:28 +0900
From:   Kuniyuki Iwashima <kuniyu@...zon.co.jp>
To:     <davem@...emloft.net>, <kuznet@....inr.ac.ru>,
        <yoshfuji@...ux-ipv6.org>, <edumazet@...gle.com>
CC:     <kuniyu@...zon.co.jp>, <kuni1840@...il.com>,
        <netdev@...r.kernel.org>, <osa-contribution-log@...zon.com>
Subject: [PATCH v2 net-next 0/3] Improve bind(addr, 0) behaviour.

Currently we fail to bind sockets to ephemeral ports when all of the ports
are exhausted even if all sockets have SO_REUSEADDR enabled. In this case,
we still have a chance to connect to the different remote hosts.

The second and third patches fix the behaviour to fully utilize all space
of the local (addr, port) tuples.

---
Changes in v2:
 - Change the description of the 2nd patch ('localhost' -> 'address').
 - Correct the description and the if statement of the 3rd patch.

v1 with tests:
 https://lore.kernel.org/netdev/20200220152020.13056-1-kuniyu@amazon.co.jp/
---

Kuniyuki Iwashima (3):
  tcp: Remove unnecessary conditions in inet_csk_bind_conflict().
  tcp: bind(addr, 0) remove the SO_REUSEADDR restriction when ephemeral
    ports are exhausted.
  tcp: Prevent port hijacking when ports are exhausted.

 net/ipv4/inet_connection_sock.c | 36 ++++++++++++++++++++++-----------
 1 file changed, 24 insertions(+), 12 deletions(-)

-- 
2.17.2 (Apple Git-113)