IP Packet Processing Example

Packet object provides get/set access to packet data
/* process an IP packet */ void input(Packet pkt) {   int hlen = pkt.getByte(0) & 0x4;   int type = pkt.getByte(9);   int src_ip = pkt.getInt(12);   if (pkt.cksum(0, hlen) != 0) {     return;   }   if (type == 6) {     pkt.shiftHeader(20); // strip IP header     Tcp.input(pkt, src_ip);   } }

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