From 3ae464c26d46fd2f19c02002d3ed78050f40cb48 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Fri, 29 Aug 1997 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1997-08-29

---
 ip/udp.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/ip/udp.c b/ip/udp.c
index e2ff0d38015a82f00bbd4bbca54974e2e4d734f0..6da7d8ae3a69caa53c7873ef4c7bf33b501d4f53 100644
--- a/ip/udp.c
+++ b/ip/udp.c
@@ -317,6 +317,34 @@ udpctl(Conv *c, char **f, int n)
 	return "unknown control request";
 }
 
+void
+udpadvise(Block *bp, char *msg)
+{
+	Udphdr *h;
+	Ipaddr source, dest;
+	ushort psource, pdest;
+	Conv *s, **p;
+
+	h = (Udphdr*)(bp->rp);
+
+	dest = nhgetl(h->udpdst);
+	source = nhgetl(h->udpsrc);
+	psource = nhgets(h->udpsport);
+	pdest = nhgets(h->udpdport);
+
+	/* Look for a connection */
+	for(p = udp.conv; *p; p++) {
+		s = *p;
+		if(s->rport == pdest && s->lport == psource)
+		if(s->raddr == dest && s->laddr == source){
+			qhangup(s->rq, msg);
+			qhangup(s->wq, msg);
+			break;
+		}
+	}
+	freeblist(bp);
+}
+
 void
 udpinit(Fs *fs)
 {
@@ -329,6 +357,7 @@ udpinit(Fs *fs)
 	udp.create = udpcreate;
 	udp.close = udpclose;
 	udp.rcv = udpiput;
+	udp.advise = udpadvise;
 	udp.ipproto = IP_UDPPROTO;
 	udp.nc = 16;
 	udp.ptclsize = sizeof(Udpcb);