lib/ipv4: add the function to check destination IP

This function can be used to discard packets with the wrong destination IP. Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

lib/ipv4: add the function to check destination IP
This function can be used to discard packets with the wrong destination IP. Signed-off-by: Adam Wujek <adam.wujek@cern.ch>
3187c81e · Adam Wujek · Grzegorz Daniluk · 69f53c93 · 3187c81e · 3187c81e
Commit 3187c81e authored Jul 29, 2016 by Adam Wujek 💬 Committed by Grzegorz Daniluk Aug 03, 2016
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ipv4.c lib/ipv4.c +8 -0

ipv4.h lib/ipv4.h +1 -0

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--- a/lib/ipv4.c
+++ b/lib/ipv4.c
@@ -205,3 +205,11 @@ void setIP(unsigned char *IP)
 		ip_status = IP_TRAINING;
 	bootp_retry = 0;
 }
+
+/* Check the destination IP of the incoming packet */
+int check_dest_ip(unsigned char *buf)
+{
+	if (!buf)
+		return -1;
+	return memcmp(buf + IP_DEST, myIP, 4);
+}
--- a/lib/ipv4.h
+++ b/lib/ipv4.h
@@ -61,6 +61,7 @@ struct wr_udp_addr {
 };

 void fill_udp(uint8_t * buf, int len, struct wr_udp_addr *uaddr);
+int check_dest_ip(unsigned char *buf);

 void syslog_init(void);
 int syslog_poll(void);