From: Martin Mares <mj@ucw.cz>
Date: Wed, 14 Apr 1999 11:21:02 +0000 (+0000)
Subject: Use SO_BINDTODEVICE if we're using old multicast API (i.e., struct ip_mreq
X-Git-Tag: v1.2.0~1596
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=36154beb705cdaf03f9ee050798d9e653ded6ca5;p=thirdparty%2Fbird.git

Use SO_BINDTODEVICE if we're using old multicast API (i.e., struct ip_mreq
and not ip_mreqn). This should get multicasts on unnumbered PtP links work.
---

diff --git a/sysdep/unix/io.c b/sysdep/unix/io.c
index d98972c70..02de2fa75 100644
--- a/sysdep/unix/io.c
+++ b/sysdep/unix/io.c
@@ -413,6 +413,16 @@ sk_open(sock *s)
 	ASSERT(s->iface);
 	mreq.imr_ifindex = s->iface->index;
 	set_inaddr(&mreq.imr_address, s->iface->ip);
+#ifdef SO_BINDTODEVICE
+	{
+	  struct ifreq ifr;
+	  strcpy(ifr.ifr_name, s->iface->name);
+	  if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr)) < 0)
+	    ERR("SO_BINDTODEVICE");
+	}
+#else
+#error Multicasts not supported on PtP devices		/* FIXME: Solve it somehow? */
+#endif
 #else
 	struct in_addr mreq;
 	struct ip_mreq mreq_add;