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Index: head/share/man/man4/carp.4
===================================================================
--- head/share/man/man4/carp.4
+++ head/share/man/man4/carp.4
@@ -26,7 +26,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd May 7, 2018
+.Dd July 1, 2018
.Dt CARP 4
.Os
.Sh NAME
@@ -104,6 +104,12 @@
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
Index: head/sys/netinet/ip.h
===================================================================
--- head/sys/netinet/ip.h
+++ head/sys/netinet/ip.h
@@ -94,6 +94,11 @@
#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
Index: head/sys/netinet/ip6.h
===================================================================
--- head/sys/netinet/ip6.h
+++ head/sys/netinet/ip6.h
@@ -104,6 +104,7 @@
#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 */
Index: head/sys/netinet/ip_carp.c
===================================================================
--- head/sys/netinet/ip_carp.c
+++ head/sys/netinet/ip_carp.c
@@ -190,6 +190,10 @@
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)
@@ -211,12 +215,16 @@
#define V_carp_ifdown_adj VNET(carp_ifdown_adj)
static int carp_allow_sysctl(SYSCTL_HANDLER_ARGS);
+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_PROC(_net_inet_carp, OID_AUTO, allow,
CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW, 0, 0, carp_allow_sysctl, "I",
"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,
@@ -933,7 +941,7 @@
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;
@@ -983,6 +991,10 @@
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;
@@ -2097,6 +2109,24 @@
}
mtx_unlock(&carp_mtx);
}
+
+ return (0);
+}
+
+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);
}

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