From: Roy Marples <roy@marples.name>
Date: Sun, 26 Jan 2020 15:46:41 +0000 (+0000)
Subject: dhcpcd: When route socket overflows, report how large it is.
X-Git-Tag: v9.0.0~78
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dc85153671e9e34b1d8459eea5975e6eb91aa852;p=thirdparty%2Fdhcpcd.git

dhcpcd: When route socket overflows, report how large it is.

Of course Linux likes to double it, so cater for this.
---

diff --git a/src/dhcpcd.c b/src/dhcpcd.c
index 20ade526..b6c531d6 100644
--- a/src/dhcpcd.c
+++ b/src/dhcpcd.c
@@ -1116,11 +1116,23 @@ dhcpcd_setlinkrcvbuf(struct dhcpcd_ctx *ctx)
 void
 dhcpcd_linkoverflow(struct dhcpcd_ctx *ctx)
 {
+	socklen_t socklen;
+	int rcvbuflen;
 	struct if_head *ifaces;
 	struct ifaddrs *ifaddrs;
 	struct interface *ifp, *ifn, *ifp1;
 
-	logerrx("route socket overflowed - learning interface state");
+	socklen = sizeof(rcvbuflen);
+	if (getsockopt(ctx->link_fd, SOL_SOCKET,
+	    SO_RCVBUF, &rcvbuflen, &socklen) == -1)
+		rcvbuflen = 0;
+#ifdef __linux__
+	else
+		rcvbuflen /= 2;
+#endif
+
+	logerrx("route socket overflowed (rcvbuflen %d)"
+	    " - learning interface state", rcvbuflen);
 
 	/* Close the existing socket and open a new one.
 	 * This is easier than draining the kernel buffer of an