o Convert IPv6 read-only stats sysctls to the read-write ones.

o Teach netstat(1) -z to reset these stats sysctls.

PR:		bin/153206
Reviewed by:	glebuis
Sponsored by:	NGINX, Inc.
MFC after:	1 month

3 files changed, 17 insertions, 11 deletions

diff --git a/sys/netinet6/in6_proto.c b/sys/netinet6/in6_proto.c
index 254ec88..ef948c0 100644
--- a/sys/netinet6/in6_proto.c
+++ b/sys/netinet6/in6_proto.c
@@ -520,7 +520,7 @@ SYSCTL_VNET_INT(_net_inet6_ip6, IPV6CTL_SENDREDIRECTS, redirect, CTLFLAG_RW,
 	&VNET_NAME(ip6_sendredirects), 0, "");
 SYSCTL_VNET_INT(_net_inet6_ip6, IPV6CTL_DEFHLIM, hlim, CTLFLAG_RW,
 	&VNET_NAME(ip6_defhlim), 0, "");
-SYSCTL_VNET_STRUCT(_net_inet6_ip6, IPV6CTL_STATS, stats, CTLFLAG_RD,
+SYSCTL_VNET_STRUCT(_net_inet6_ip6, IPV6CTL_STATS, stats, CTLFLAG_RW,
 	&VNET_NAME(ip6stat), ip6stat, "");
 SYSCTL_VNET_INT(_net_inet6_ip6, IPV6CTL_MAXFRAGPACKETS, maxfragpackets,
 	CTLFLAG_RW, &VNET_NAME(ip6_maxfragpackets), 0, "");
@@ -573,7 +573,7 @@ SYSCTL_VNET_INT(_net_inet6_ip6, IPV6CTL_AUTO_LINKLOCAL, auto_linklocal,
 	CTLFLAG_RW, &VNET_NAME(ip6_auto_linklocal), 0,
 	"Default value of per-interface flag for automatically adding an IPv6"
 	" link-local address to interfaces when attached");
-SYSCTL_VNET_STRUCT(_net_inet6_ip6, IPV6CTL_RIP6STATS, rip6stats, CTLFLAG_RD,
+SYSCTL_VNET_STRUCT(_net_inet6_ip6, IPV6CTL_RIP6STATS, rip6stats, CTLFLAG_RW,
 	&VNET_NAME(rip6stat), rip6stat, "");
 SYSCTL_VNET_INT(_net_inet6_ip6, IPV6CTL_PREFER_TEMPADDR, prefer_tempaddr,
 	CTLFLAG_RW, &VNET_NAME(ip6_prefer_tempaddr), 0, "");
@@ -603,7 +603,7 @@ SYSCTL_VNET_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRACCEPT, rediraccept,
 	CTLFLAG_RW, &VNET_NAME(icmp6_rediraccept), 0, "");
 SYSCTL_VNET_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRTIMEOUT, redirtimeout,
 	CTLFLAG_RW, &VNET_NAME(icmp6_redirtimeout), 0, "");
-SYSCTL_VNET_STRUCT(_net_inet6_icmp6, ICMPV6CTL_STATS, stats, CTLFLAG_RD,
+SYSCTL_VNET_STRUCT(_net_inet6_icmp6, ICMPV6CTL_STATS, stats, CTLFLAG_RW,
 	&VNET_NAME(icmp6stat), icmp6stat, "");
 SYSCTL_VNET_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_PRUNE, nd6_prune, CTLFLAG_RW,
 	&VNET_NAME(nd6_prune), 0, "");
diff --git a/sys/netinet6/ip6_mroute.c b/sys/netinet6/ip6_mroute.c
index a4f5044..98bf0ac 100644
--- a/sys/netinet6/ip6_mroute.c
+++ b/sys/netinet6/ip6_mroute.c
@@ -250,7 +250,7 @@ static mifi_t nummifs = 0;
 static mifi_t reg_mif_num = (mifi_t)-1;
 
 static struct pim6stat pim6stat;
-SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RD,
+SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW,
     &pim6stat, pim6stat,
     "PIM Statistics (struct pim6stat, netinet6/pim_var.h)");
 
diff --git a/usr.bin/netstat/inet6.c b/usr.bin/netstat/inet6.c
index 411b0ca..03fef6e 100644
--- a/usr.bin/netstat/inet6.c
+++ b/usr.bin/netstat/inet6.c
@@ -360,15 +360,17 @@ static char *srcrule_str[] = {
 void
 ip6_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
 {
-	struct ip6stat ip6stat;
+	struct ip6stat ip6stat, zerostat;
 	int first, i;
 	size_t len;
 
 	len = sizeof ip6stat;
 	if (live) {
 		memset(&ip6stat, 0, len);
-		if (sysctlbyname("net.inet6.ip6.stats", &ip6stat, &len, NULL,
-		    0) < 0) {
+		if (zflag)
+			memset(&zerostat, 0, len);
+		if (sysctlbyname("net.inet6.ip6.stats", &ip6stat, &len,
+		    zflag ? &zerostat : NULL, zflag ? len : 0) < 0) {
 			if (errno != ENOENT)
 				warn("sysctl: net.inet6.ip6.stats");
 			return;
@@ -840,15 +842,17 @@ static	const char *icmp6names[] = {
 void
 icmp6_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
 {
-	struct icmp6stat icmp6stat;
+	struct icmp6stat icmp6stat, zerostat;
 	int i, first;
 	size_t len;
 
 	len = sizeof icmp6stat;
 	if (live) {
 		memset(&icmp6stat, 0, len);
+		if (zflag)
+			memset(&zerostat, 0, len);
 		if (sysctlbyname("net.inet6.icmp6.stats", &icmp6stat, &len,
-		    NULL, 0) < 0) {
+		    zflag ? &zerostat : NULL, zflag ? len : 0) < 0) {
 			if (errno != ENOENT)
 				warn("sysctl: net.inet6.icmp6.stats");
 			return;
@@ -1033,14 +1037,16 @@ pim6_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
 void
 rip6_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
 {
-	struct rip6stat rip6stat;
+	struct rip6stat rip6stat, zerostat;
 	u_quad_t delivered;
 	size_t len;
 
 	len = sizeof(rip6stat);
 	if (live) {
+		if (zflag)
+			memset(&zerostat, 0, len);
 		if (sysctlbyname("net.inet6.ip6.rip6stats", &rip6stat, &len,
-		    NULL, 0) < 0) {
+		    zflag ? &zerostat : NULL, zflag ? len : 0) < 0) {
 			if (errno != ENOENT)
 				warn("sysctl: net.inet6.ip6.rip6stats");
 			return;