X-Git-Url: https://git.sesse.net/?p=cubemap;a=blobdiff_plain;f=udpstream.cpp;h=74d6ef03ce7853658e8836bbb4a07256e32c9e5c;hp=1e79494a3d8d302c5195ea17efeab83954eb37ea;hb=b08dc2a81825a298a03f2dee2ae7dd7045e72739;hpb=e58011d0b12b490acaf7b65f7462a119ca8d6410

diff --git a/udpstream.cpp b/udpstream.cpp
index 1e79494..74d6ef0 100644
--- a/udpstream.cpp
+++ b/udpstream.cpp
@@ -9,8 +9,8 @@
 #define SO_MAX_PACING_RATE 47
 #endif
 
-UDPStream::UDPStream(const sockaddr_in6 &dst, uint32_t pacing_rate)
-	: dst(dst) 
+UDPStream::UDPStream(const sockaddr_in6 &dst, uint32_t pacing_rate, int ttl)
+	: dst(dst)
 {
 	sock = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
 	if (sock == -1) {
@@ -24,6 +24,23 @@ UDPStream::UDPStream(const sockaddr_in6 &dst, uint32_t pacing_rate)
 			log_perror("setsockopt(SO_MAX_PACING_RATE)");
 		}
 	}
+
+	if (ttl != -1) {
+		// Seemingly the IPv4 parameters are used for sending to IPv4,
+		// even on an AF_INET6 socket, so we need to set both.
+		if (setsockopt(sock, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl)) == -1) {
+			log_perror("setsockopt(IP_TTL)");
+		}
+		if (setsockopt(sock, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) == -1) {
+			log_perror("setsockopt(IP_MULTICAST_TTL)");
+		}
+		if (setsockopt(sock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)) == -1) {
+			log_perror("setsockopt(IPV6_UNICAST_HOPS)");
+		}
+		if (setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl)) == -1) {
+			log_perror("setsockopt(IPV6_MULTICAST_HOPS)");
+		}
+	}
 }
 
 UDPStream::~UDPStream()