IPv4 的协议字段

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/*
* Constants and structures defined by the internet system,
* Per RFC 790, September 1981, and numerous additions.
*/
/*
* Protocols
*/#define IPPROTO_IP  0  /* dummy for IP */
#define IPPROTO_ICMP  1  /* control message protocol */
#define IPPROTO_IGMP  2  /* group mgmt protocol */
#define IPPROTO_GGP  3  /* gateway^2 (deprecated) */
#define IPPROTO_TCP  6  /* tcp */
#define IPPROTO_EGP  8  /* exterior gateway protocol */
#define IPPROTO_PUP  12  /* pup */
#define IPPROTO_UDP  17  /* user datagram protocol */
#define IPPROTO_IDP  22  /* xns idp */
#define IPPROTO_TP  29   /* tp-4 w/ class negotiation */
#define IPPROTO_EON  80  /* ISO cnlp */
#define IPPROTO_ENCAP  98  /* encapsulation header */
#define IPPROTO_RAW  255  /* raw IP packet */
#define IPPROTO_MAX  256


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