From owner-svn-src-all@freebsd.org Fri Jan 27 23:10:47 2017 Return-Path: Delivered-To: svn-src-all@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id AA7E9CC4A06; Fri, 27 Jan 2017 23:10:47 +0000 (UTC) (envelope-from hiren@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 7A3931961; Fri, 27 Jan 2017 23:10:47 +0000 (UTC) (envelope-from hiren@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id v0RNAkY6044118; Fri, 27 Jan 2017 23:10:46 GMT (envelope-from hiren@FreeBSD.org) Received: (from hiren@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id v0RNAkdg044117; Fri, 27 Jan 2017 23:10:46 GMT (envelope-from hiren@FreeBSD.org) Message-Id: <201701272310.v0RNAkdg044117@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: hiren set sender to hiren@FreeBSD.org using -f From: Hiren Panchasara Date: Fri, 27 Jan 2017 23:10:46 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r312907 - head/sys/netinet X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 27 Jan 2017 23:10:47 -0000 Author: hiren Date: Fri Jan 27 23:10:46 2017 New Revision: 312907 URL: https://svnweb.freebsd.org/changeset/base/312907 Log: Add a knob to change default behavior of inheriting listen socket's tcp stack regardless of what the default stack for the system is set to. With current/default behavior, after changing the default tcp stack, the application needs to be restarted to pick up that change. Setting this new knob net.inet.tcp.functions_inherit_listen_socket_stack to '0' would change that behavior and make any new connection use the newly selected default tcp stack. Reviewed by: rrs MFC after: 2 weeks Sponsored by: Limelight Networks Modified: head/sys/netinet/tcp_syncache.c Modified: head/sys/netinet/tcp_syncache.c ============================================================================== --- head/sys/netinet/tcp_syncache.c Fri Jan 27 23:08:30 2017 (r312906) +++ head/sys/netinet/tcp_syncache.c Fri Jan 27 23:10:46 2017 (r312907) @@ -120,6 +120,14 @@ SYSCTL_INT(_net_inet_tcp, OID_AUTO, sync &VNET_NAME(tcp_syncookiesonly), 0, "Use only TCP SYN cookies"); +static VNET_DEFINE(int, functions_inherit_listen_socket_stack) = 1; +#define V_functions_inherit_listen_socket_stack \ + VNET(functions_inherit_listen_socket_stack) +SYSCTL_INT(_net_inet_tcp, OID_AUTO, functions_inherit_listen_socket_stack, + CTLFLAG_VNET | CTLFLAG_RW, + &VNET_NAME(functions_inherit_listen_socket_stack), 0, + "Inherit listen socket's stack"); + #ifdef TCP_OFFLOAD #define ADDED_BY_TOE(sc) ((sc)->sc_tod != NULL) #endif @@ -830,7 +838,7 @@ syncache_socket(struct syncache *sc, str tcp_rcvseqinit(tp); tcp_sendseqinit(tp); blk = sototcpcb(lso)->t_fb; - if (blk != tp->t_fb) { + if (V_functions_inherit_listen_socket_stack && blk != tp->t_fb) { /* * Our parents t_fb was not the default, * we need to release our ref on tp->t_fb and