From: VittGam <github@vittgam.net>
Date: Sun, 21 Dec 2014 13:29:40 +0000 (+0100)
Subject: Support ToS/DiffServ priority handling for IPv6 meta and UDP connections.
X-Git-Tag: release-1.0.25~6
X-Git-Url: https://tinc-vpn.org/git/browse?a=commitdiff_plain;h=c72e237;p=tinc

Support ToS/DiffServ priority handling for IPv6 meta and UDP connections.
---

diff --git a/src/net_packet.c b/src/net_packet.c
index d11d58ad..dbf65463 100644
--- a/src/net_packet.c
+++ b/src/net_packet.c
@@ -415,7 +415,7 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) {
 	vpn_packet_t *outpkt;
 	int origlen;
 	int outlen, outpad;
-#if defined(SOL_IP) && defined(IP_TOS)
+#if (defined(SOL_IP) && defined(IP_TOS)) || (defined(IPPROTO_IPV6) && defined(IPV6_TCLASS))
 	static int priority = 0;
 #endif
 	int origpriority;
@@ -550,15 +550,23 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) {
 	}
 
 #if defined(SOL_IP) && defined(IP_TOS)
-	if(priorityinheritance && origpriority != priority
-	   && listen_socket[n->sock].sa.sa.sa_family == AF_INET) {
+	if(priorityinheritance && origpriority != priority && listen_socket[n->sock].sa.sa.sa_family == AF_INET) {
 		priority = origpriority;
-		ifdebug(TRAFFIC) logger(LOG_DEBUG, "Setting outgoing packet priority to %d", priority);
+		ifdebug(TRAFFIC) logger(LOG_DEBUG, "Setting IPv4 outgoing packet priority to %d", priority);
 		if(setsockopt(listen_socket[n->sock].udp, SOL_IP, IP_TOS, &priority, sizeof(priority)))	/* SO_PRIORITY doesn't seem to work */
 			logger(LOG_ERR, "System call `%s' failed: %s", "setsockopt", strerror(errno));
 	}
 #endif
 
+#if defined(IPPROTO_IPV6) && defined(IPV6_TCLASS)
+	if(priorityinheritance && origpriority != priority && listen_socket[n->sock].sa.sa.sa_family == AF_INET6) {
+		priority = origpriority;
+		ifdebug(TRAFFIC) logger(LOG_DEBUG, "Setting IPv6 outgoing packet priority to %d", priority);
+		if(setsockopt(listen_socket[n->sock].udp, IPPROTO_IPV6, IPV6_TCLASS, &priority, sizeof(priority)))	/* SO_PRIORITY doesn't seem to work */
+			logger(LOG_ERR, "System call `%s' failed: %s", "setsockopt", strerror(errno));
+	}
+#endif
+
 	if(sendto(listen_socket[sock].udp, (char *) &inpkt->seqno, inpkt->len, 0, sa, sl) < 0 && !sockwouldblock(sockerrno)) {
 		if(sockmsgsize(sockerrno)) {
 			if(n->maxmtu >= origlen)
diff --git a/src/net_setup.c b/src/net_setup.c
index a00a3210..765a9ebf 100644
--- a/src/net_setup.c
+++ b/src/net_setup.c
@@ -539,7 +539,12 @@ static bool setup_myself(void) {
 
 #if !defined(SOL_IP) || !defined(IP_TOS)
 	if(priorityinheritance)
-		logger(LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
+		logger(LOG_WARNING, "%s not supported on this platform for IPv4 connection", "PriorityInheritance");
+#endif
+
+#if !defined(IPPROTO_IPV6) || !defined(IPV6_TCLASS)
+	if(priorityinheritance)
+		logger(LOG_WARNING, "%s not supported on this platform for IPv6 connection", "PriorityInheritance");
 #endif
 
 	if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
diff --git a/src/net_socket.c b/src/net_socket.c
index 948ce011..cb271063 100644
--- a/src/net_socket.c
+++ b/src/net_socket.c
@@ -78,6 +78,11 @@ static void configure_tcp(connection_t *c) {
 	option = IPTOS_LOWDELAY;
 	setsockopt(c->socket, SOL_IP, IP_TOS, (void *)&option, sizeof(option));
 #endif
+
+#if defined(IPPROTO_IPV6) && defined(IPV6_TCLASS) && defined(IPTOS_LOWDELAY)
+	option = IPTOS_LOWDELAY;
+	setsockopt(c->socket, IPPROTO_IPV6, IPV6_TCLASS, (void *)&option, sizeof(option));
+#endif
 }
 
 static bool bind_to_interface(int sd) {