[U-Boot] [PATCH 2/2] net: Filter incoming netconsole packets by IP

[Joe Hershberger]

Check the incoming packets' source IP address... if ncip isn't set to a
broadcast address, only listen to the client at ncip.


Signed-off-by: Joe Hershberger <joe.hershberger at ni.com>
---
 drivers/net/netconsole.c | 8 ++++++--
 include/net.h            | 3 ++-
 net/net.c                | 1 +
 3 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index a31b95c..975507b 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -138,13 +138,17 @@ void NcStart(void)
 	}
 }
 
-int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len)
+int nc_input_packet(uchar *pkt, IPaddr_t src_ip, unsigned dest_port,
+	unsigned src_port, unsigned len)
 {
 	int end, chunk;
 
-	if (dest != nc_in_port || !len)
+	if (dest_port != nc_in_port || !len)
 		return 0; /* not for us */
 
+	if (src_ip != nc_ip && !is_broadcast(nc_ip))
+		return 0; /* not from our client */
+
 	debug_cond(DEBUG_DEV_PKT, "input: \"%*.*s\"\n", len, len, pkt);
 
 	if (input_size == sizeof(input_buffer))
diff --git a/include/net.h b/include/net.h
index 6d2d6cd..f0cf2ee 100644
--- a/include/net.h
+++ b/include/net.h
@@ -529,7 +529,8 @@ extern void NetReceive(uchar *, int);
 
 #ifdef CONFIG_NETCONSOLE
 void NcStart(void);
-int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len);
+int nc_input_packet(uchar *pkt, IPaddr_t src_ip, unsigned dest_port,
+	unsigned src_port, unsigned len);
 #endif
 
 /*
diff --git a/net/net.c b/net/net.c
index e8ff066..83fcbe5 100644
--- a/net/net.c
+++ b/net/net.c
@@ -1147,6 +1147,7 @@ NetReceive(uchar *inpkt, int len)
 
 #ifdef CONFIG_NETCONSOLE
 		nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
+					ntohl(ip->ip_src),
 					ntohs(ip->udp_dst),
 					ntohs(ip->udp_src),
 					ntohs(ip->udp_len) - UDP_HDR_SIZE);
-- 
1.7.11.5