Fix accidental termination of ax25ipd.

ax25ipd sometimes terminated ("normaly") when the remote site (or
a router on the way) sent an icmp unreachable.
That's a problem with a positive error list (where every unknown
error is interpreted as major problem); this makes the code
unstable whenever new errno's are implemented in newer kernels..

Signed-off-by: Thomas Osterried <thomas@osterried.de>

1 files changed, 20 insertions, 0 deletions

diff --git a/ax25ipd/io.c b/ax25ipd/io.c
index 4277612..a293d69 100644
--- a/ax25ipd/io.c
+++ b/ax25ipd/io.c
@@ -620,6 +620,16 @@ int io_error(
 				fprintf (stderr, "message was %d bytes long.\n", bufsize);
 				return 0;
 			}
+			if (errno == ENETDOWN || errno == ENETRESET ||
+			    errno == ENETUNREACH || errno == EHOSTDOWN ||
+			    errno == EHOSTUNREACH || errno == ENONET ||
+			    errno == EPERM) {
+				/* host closed his axip receiver or dropped the line */
+				perror("error after sending on to axip partner. ignoring.");
+				LOGL4("error after sending on to axip partner: %s; ignoring!\n", strerror(errno));
+
+				return 0;
+			}
 			if (errno == ENOBUFS) {	/* congestion; sleep + retry */
 				LOGL4("send congestion on raw ip, sleeping and retrying!\n");
 				usleep(100000);
@@ -638,6 +648,16 @@ int io_error(
 				fprintf(stderr, "message was %d bytes long.\n", bufsize);
 				return 0;
 			}
+			if (errno == ENETDOWN || errno == ENETRESET ||
+			    errno == ENETUNREACH || errno == EHOSTDOWN ||
+			    errno == EHOSTUNREACH || errno == ENONET ||
+			    errno == EPERM) {
+				/* host closed his axudp receiver or dropped the line */
+				perror("error after sending to axudp partner. ignoring.");
+				LOGL4("error after sending to axudp partner: %s; ignoring!\n", strerror(errno));
+
+				return 0;
+			}
 			if (errno == ENOBUFS) {	/* congestion; sleep + retry */
 				LOGL4("send congestion on udp, sleeping and retrying!\n");
 				usleep(100000);