Курсовая работа: Реализация сети в операционной системе Linux

struct arphdr *arph;

struct ipxhdr *ipxh;

unsigned char *raw;

} nh;

/* Link layer header */

union

{

struct ethhdr *ethernet;

unsigned char *raw;

} mac;

struct dst_entry *dst;

/*

* This is the control buffer. It is free to use for every

* layer. Please put your private variables there. If you

* want to keep them across layers you have to do a skb_clone()

* first. This is owned by whoever has the skb queued ATM.

*/

char cb[48];

unsigned int len; /* Length of actual data */

unsigned int data_len;

unsigned int csum; /* Checksum */

unsigned char __unused, /* Dead field, may be reused */

cloned, /* head may be cloned (check refcnt to be sure). */

pkt_type, /* Packet class */

ip_summed; /* Driver fed us an IP checksum */

__u32 priority; /* Packet queueing priority */

atomic_t users; /* User count - see datagram.c,tcp.c */

unsigned short protocol; /* Packet protocol from driver. */

unsigned short security; /* Security level of packet */