ipif fixes

2 files changed, 12 insertions, 1 deletions

diff --git a/debian/changelog b/debian/changelog
index 0c3b57f..35d54fc 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,12 @@
+userv-utils (0.4.1) unstable; urgency=low
+
+  ipif bugfixes:
+  * Ignore empty packets (ie consecutive END bytes), as tun rejects
+    them with EINVAL.
+  * Tolerate ENOMEM from tun.
+
+ -- Ian Jackson <ijackson@chiark.greenend.org.uk>  Sat, 14 Jan 2012 15:46:53 +0000
+
 userv-utils (0.4) unstable; urgency=low
 
   ipif:
diff --git a/ipif/service.c b/ipif/service.c
index 670b447..b9d8b44 100644
--- a/ipif/service.c
+++ b/ipif/service.c
@@ -719,11 +719,13 @@ static void setnonblock(int fd) {
 }
 
 static void rx_packet(const uint8_t *packet, int len) {
+  if (!len)
+    return;
   for (;;) {
     int r= write(tunfd, packet, len);
     if (r<0) {
       if (errno==EINTR) continue;
-      if (errno==EAGAIN) return; /* oh well */
+      if (errno==EAGAIN || errno==ENOMEM) return; /* oh well */
       sysfatal("error writing packet to tun (transmitting)");
     }
     assert(r==len);