Date: Fri, 26 Apr 2019 17:01:56 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r346755 - in stable/11: . share/man/man4 sys/netinet Message-ID: <201904261701.x3QH1uLK000295@repo.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: mav Date: Fri Apr 26 17:01:56 2019 New Revision: 346755 URL: https://svnweb.freebsd.org/changeset/base/346755 Log: MFC r335837 (by kp): carp: Set DSCP value CS7 Update carp to set DSCP value CS7(Network Traffic) in the flowlabel field of packets by default. Currently carp only sets TOS_LOWDELAY in IPv4 which was deprecated in 1998. This also implements sysctl that can revert carp back to it's old behavior if desired. This will allow implementation of QOS on modern network devices to make sure carp packets aren't dropped during interface contention. Submitted by: Nick Wolff <darkfiberiru AT gmail.com> Sponsored by: iXsystems, Inc. Differential Revision: https://reviews.freebsd.org/D14536 Modified: stable/11/UPDATING stable/11/share/man/man4/carp.4 stable/11/sys/netinet/ip.h stable/11/sys/netinet/ip6.h stable/11/sys/netinet/ip_carp.c Directory Properties: stable/11/ (props changed) Modified: stable/11/UPDATING ============================================================================== --- stable/11/UPDATING Fri Apr 26 16:38:23 2019 (r346754) +++ stable/11/UPDATING Fri Apr 26 17:01:56 2019 (r346755) @@ -16,6 +16,12 @@ from older versions of FreeBSD, try WITHOUT_CLANG and the tip of head, and then rebuild without this option. The bootstrap process from older version of current across the gcc/clang cutover is a bit fragile. +20190426: + CARP now sets DSCP value CS7(Network Traffic) in the flowlabel field + of packets by default instead of only setting TOS_LOWDELAY in IPv4, + which was deprecated in 1998. Original behavior can be restored by + setting sysctl net.inet.carp.dscp=4. + 20190416: Clang, llvm, lld, lldb, compiler-rt and libc++ have been upgraded to 8.0.0. Please see the 20141231 entry below for information about Modified: stable/11/share/man/man4/carp.4 ============================================================================== --- stable/11/share/man/man4/carp.4 Fri Apr 26 16:38:23 2019 (r346754) +++ stable/11/share/man/man4/carp.4 Fri Apr 26 17:01:56 2019 (r346755) @@ -26,7 +26,7 @@ .\" .\" $FreeBSD$ .\" -.Dd February 21, 2013 +.Dd July 1, 2018 .Dt CARP 4 .Os .Sh NAME @@ -102,6 +102,12 @@ Allow virtual hosts to preempt each other. When enabled, a vhid in a backup state would preempt a master that is announcing itself with a lower advskew. Disabled by default. +.It Va net.inet.carp.dscp +DSCP value in carp packet. +Valid Values are 0 to 63. +A value of 4 is equivalent to the old standard of TOS LOW_DELAY. +TOS values were deprecated and replaced by DSCP in 1998. +The default value is 56 (CS7/Network Control). .It Va net.inet.carp.log Determines what events relating to .Nm Modified: stable/11/sys/netinet/ip.h ============================================================================== --- stable/11/sys/netinet/ip.h Fri Apr 26 16:38:23 2019 (r346754) +++ stable/11/sys/netinet/ip.h Fri Apr 26 17:01:56 2019 (r346755) @@ -92,6 +92,11 @@ struct ip { #define IPTOS_PREC_ROUTINE IPTOS_DSCP_CS0 /* + * Offset of Diffserv decimal value to convert it to tos value . + */ +#define IPTOS_DSCP_OFFSET 2 + +/* * Definitions for DiffServ Codepoints as per RFC2474 and RFC5865. */ #define IPTOS_DSCP_CS0 0x00 Modified: stable/11/sys/netinet/ip6.h ============================================================================== --- stable/11/sys/netinet/ip6.h Fri Apr 26 16:38:23 2019 (r346754) +++ stable/11/sys/netinet/ip6.h Fri Apr 26 17:01:56 2019 (r346755) @@ -102,6 +102,7 @@ struct ip6_hdr { #define IPV6_FLOWLABEL_MASK 0xffff0f00 /* flow label (20 bits) */ #endif /* LITTLE_ENDIAN */ #endif +#define IPV6_FLOWLABEL_LEN 20 #if 1 /* ECN bits proposed by Sally Floyd */ #define IP6TOS_CE 0x01 /* congestion experienced */ Modified: stable/11/sys/netinet/ip_carp.c ============================================================================== --- stable/11/sys/netinet/ip_carp.c Fri Apr 26 16:38:23 2019 (r346754) +++ stable/11/sys/netinet/ip_carp.c Fri Apr 26 17:01:56 2019 (r346755) @@ -190,6 +190,10 @@ static int proto_reg[] = {-1, -1}; static VNET_DEFINE(int, carp_allow) = 1; #define V_carp_allow VNET(carp_allow) +/* Set DSCP in outgoing CARP packets. */ +static VNET_DEFINE(int, carp_dscp) = 56; +#define V_carp_dscp VNET(carp_dscp) + /* Preempt slower nodes. */ static VNET_DEFINE(int, carp_preempt) = 0; #define V_carp_preempt VNET(carp_preempt) @@ -210,11 +214,15 @@ static VNET_DEFINE(int, carp_senderr_adj) = CARP_MAXSK static VNET_DEFINE(int, carp_ifdown_adj) = CARP_MAXSKEW; #define V_carp_ifdown_adj VNET(carp_ifdown_adj) +static int carp_dscp_sysctl(SYSCTL_HANDLER_ARGS); static int carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS); SYSCTL_NODE(_net_inet, IPPROTO_CARP, carp, CTLFLAG_RW, 0, "CARP"); SYSCTL_INT(_net_inet_carp, OID_AUTO, allow, CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(carp_allow), 0, "Accept incoming CARP packets"); +SYSCTL_PROC(_net_inet_carp, OID_AUTO, dscp, + CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW, 0, 0, carp_dscp_sysctl, "I", + "DSCP value for carp packets"); SYSCTL_INT(_net_inet_carp, OID_AUTO, preempt, CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(carp_preempt), 0, "High-priority backup preemption mode"); SYSCTL_INT(_net_inet_carp, OID_AUTO, log, CTLFLAG_VNET | CTLFLAG_RW, @@ -834,7 +842,7 @@ carp_send_ad_locked(struct carp_softc *sc) ip = mtod(m, struct ip *); ip->ip_v = IPVERSION; ip->ip_hl = sizeof(*ip) >> 2; - ip->ip_tos = IPTOS_LOWDELAY; + ip->ip_tos = V_carp_dscp << IPTOS_DSCP_OFFSET; ip->ip_len = htons(len); ip->ip_off = htons(IP_DF); ip->ip_ttl = CARP_DFLTTL; @@ -886,6 +894,10 @@ carp_send_ad_locked(struct carp_softc *sc) ip6 = mtod(m, struct ip6_hdr *); bzero(ip6, sizeof(*ip6)); ip6->ip6_vfc |= IPV6_VERSION; + /* Traffic class isn't defined in ip6 struct instead + * it gets offset into flowid field */ + ip6->ip6_flow |= htonl(V_carp_dscp << (IPV6_FLOWLABEL_LEN + + IPTOS_DSCP_OFFSET)); ip6->ip6_hlim = CARP_DFLTTL; ip6->ip6_nxt = IPPROTO_CARP; bzero(&sa, sizeof(sa)); @@ -2000,6 +2012,24 @@ carp_demote_adj(int adj, char *reason) atomic_add_int(&V_carp_demotion, adj); CARP_LOG("demoted by %d to %d (%s)\n", adj, V_carp_demotion, reason); taskqueue_enqueue(taskqueue_swi, &carp_sendall_task); +} + +static int +carp_dscp_sysctl(SYSCTL_HANDLER_ARGS) +{ + int new, error; + + new = V_carp_dscp; + error = sysctl_handle_int(oidp, &new, 0, req); + if (error || !req->newptr) + return (error); + + if (new < 0 || new > 63) + return (EINVAL); + + V_carp_dscp = new; + + return (0); } static int
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201904261701.x3QH1uLK000295>