working on icmp ping reply

1 files changed, 28 insertions, 0 deletions

diff --git a/net/icmp.h b/net/icmp.h
new file mode 100644
index 0000000..c2c5e8f
--- /dev/null
+++ b/net/icmp.h
@@ -0,0 +1,28 @@
+//http://www.saminiir.com/lets-code-tcp-ip-stack-2-ipv4-icmpv4/
+#include <stdint.h>
+#include <stdbool.h>
+
+#include "netdev.h"
+
+struct icmp_v4 {
+    uint8_t type;	    // purpose 0-echo reply, 3- unreachable, 8- echo request, etc...
+    uint8_t code;	    // reason (type=3,code=0 net unreachable, etc..)
+    uint16_t csum;	    // checksum (Same as in ipv4 header)
+    uint8_t data[];	    // payload (example icmp_v4_echo)
+} __attribute__((packed));
+
+// payload
+struct icmp_v4_echo {
+    uint16_t id;	    // set by sender
+    uint16_t seq;	    // starting at 0
+    uint8_t data[];	    // optinal (example timestamp)
+} __attribute__((packed));
+
+struct icmp_v4_dst_unreachable {
+    uint8_t unused;	    
+    uint8_t len;	    // lenght of original datagramm
+    uint16_t var;	    // depends on icmp code
+    uint8_t data[];
+} __attribute__((packed));
+
+bool icmp_incoming(struct netdev *dev,struct icmp_v4 *data, uint32_t count_bytes);