Index: sys/netinet6/in6_proto.c
===================================================================
--- sys/netinet6/in6_proto.c
+++ sys/netinet6/in6_proto.c
@@ -517,15 +517,23 @@
 }
 
 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_FORWARDING, forwarding,
-	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_forwarding), 0, "");
+	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_forwarding), 0,
+	"Enable routing/forwarding of IPv6 packets.");
 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_SENDREDIRECTS, redirect,
-	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_sendredirects), 0, "");
+	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_sendredirects), 0,
+	"Enable sending of ICMPv6 redirects in response to unforwardable IPv6"
+	" packets. This option is ignored unless the node is routing IPv6"
+	" packets.");
 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFHLIM, hlim, CTLFLAG_VNET | CTLFLAG_RW,
-	&VNET_NAME(ip6_defhlim), 0, "");
+	&VNET_NAME(ip6_defhlim), 0,
+	"Default hop limit to use for outgoing IPv6 packets.");
 SYSCTL_VNET_PCPUSTAT(_net_inet6_ip6, IPV6CTL_STATS, stats, struct ip6stat,
 	ip6stat, "IP6 statistics (struct ip6stat, netinet6/ip6_var.h)");
 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MAXFRAGPACKETS, maxfragpackets,
-	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_maxfragpackets), 0, "");
+	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_maxfragpackets), 0,
+	"Default setting for amount of fragmented packets this node will accept."
+	" A setting of 0 means no fragmented packets will be accepted, while a"
+	" setting of -1 means no limit.");
 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_ACCEPT_RTADV, accept_rtadv,
 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_accept_rtadv), 0,
 	"Default value of per-interface flag for accepting ICMPv6 Router"
@@ -544,21 +552,33 @@
 	"Accept the default router list from ICMPv6 RA messages even "
 	"when packet forwarding enabled.");
 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_LOG_INTERVAL, log_interval,
-	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_log_interval), 0, "");
+	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_log_interval), 0,
+	"Default interval in seconds between IPv6 packet forwarding engine log"
+	" output.");
 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_HDRNESTLIMIT, hdrnestlimit,
-	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_hdrnestlimit), 0, "");
+	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_hdrnestlimit), 0,
+	"Default setting for maximum number of IPv6 extension headers permitted on"
+	" incoming IPv6 packets. A value of 0 means no artificial limit.");
 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DAD_COUNT, dad_count,
-	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_dad_count), 0, "");
+	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_dad_count), 0,
+	"Default number of IPv6 DAD (duplicated address detection) probe packets.");
 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_FLOWLABEL, auto_flowlabel,
-	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_auto_flowlabel), 0, "");
+	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_auto_flowlabel), 0,
+	"Enable/disable automatic filling of the IPv6 flowlabel field.");
 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFMCASTHLIM, defmcasthlim,
-	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_defmcasthlim), 0, "");
+	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_defmcasthlim), 0,
+	"Default hop limit for an IPv6 multicast packet originating from this"
+	" node.");
 SYSCTL_STRING(_net_inet6_ip6, IPV6CTL_KAME_VERSION, kame_version,
-	CTLFLAG_RD, __KAME_VERSION, 0, "");
+	CTLFLAG_RD, __KAME_VERSION, 0,
+	"Identifies the version of this nodes KAME IPv6 stack.");
 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEPRECATED, use_deprecated,
-	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_use_deprecated), 0, "");
+	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_use_deprecated), 0,
+	"Enable use of deprecated addresses specified in RFC2462 5.5.4.");
 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_RR_PRUNE, rr_prune,
-	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_rr_prune), 0, "");
+	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_rr_prune), 0,
+	"Default interval in seconds between IPv6 router renumbering prefix"
+	" babysitting.");
 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USETEMPADDR, use_tempaddr,
 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_use_tempaddr), 0, "");
 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_TEMPPLTIME, temppltime,
@@ -570,7 +590,9 @@
 	&VNET_NAME(ip6_temp_valid_lifetime), 0,
    	sysctl_ip6_tempvltime, "I", "");
 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_V6ONLY, v6only,
-	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_v6only), 0, "");
+	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_v6only), 0,
+	"Whether to restrict sockets listening on the wildcard address [::] to"
+	" IPv6 addresses. A value of 0 means they'll also listen on IPv4 addresses.");
 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_LINKLOCAL, auto_linklocal,
 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_auto_linklocal), 0,
 	"Default value of per-interface flag for automatically adding an IPv6"