留学生考试辅导 // packet_in: extern for input packet

// packet_in: extern for input packet
extern packet_in {
void extract(out T hdr);
void extract(out T hdr,in bit<32> n);

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T lookahead();
void advance(in bit<32> n);
bit<32> length();

// parser: begins in special “start” state
state start {
transition parse_ethernet;

// User-defined parser state
state parse_ethernet {
packet.extract(hdr.ethernet);
transition select(hdr.ethernet.type) {
0x800: parse_ipv4;
default: accept;

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