Linux 核心--16.Linux数据结构( 六 ) _云知道

unsigned　char　*data;　/*　Data　head　pointer　*/
unsigned　char　*tail;　/*　Tail　pointer*/
unsigned　char　*end;/*　End　pointer　*/
void(*destructor)(struct　sk_buff　*);　/*　Destruct　function　*/
__u16　redirport;　/*　Redirect　port　*/
};

sock
包含BSD套接口的协议相关信息。例如对于一个INET（Internet　Address　Domain）套接口此数据结构　包含TCP/IP和UDP/IP信息。

struct　sock
{
/*　This　must　be　first.　*/
struct　sock　*sklist_next;
struct　sock　*sklist_prev;

struct　options*opt;
atomic_twmem_alloc;
atomic_trmem_alloc;
unsigned　long　allocation;　/*　Allocation　mode　*/
__u32　write_seq;
__u32　sent_seq;
__u32　acked_seq;
__u32　copied_seq;
__u32　rcv_ack_seq;
unsigned　shortrcv_ack_cnt;/*　count　of　same　ack　*/
__u32　window_seq;
__u32　fin_seq;
__u32　urg_seq;
__u32　urg_data;
__u32　syn_seq;
int　users;/*　user　count　*/
/*
　*Not　all　are　volatile,　but　some　are,　so　we
　*　might　as　well　say　they　all　are.
　*/
volatile　char　dead,
urginline,
intr,
blog,
done,
reuse,
keepopen,
linger,
delay_acks,
destroy,
ack_timed,
no_check,
zapped,
broadcast,
nonagle,
bsdism;
unsigned　long　lingertime;
int　proc;

struct　sock　*next;
struct　sock　**pprev;
struct　sock　*bind_next;
struct　sock　**bind_pprev;
struct　sock　*pair;
int　hashent;
struct　sock　*prev;
struct　sk_buff*volatile　send_head;
struct　sk_buff*volatile　send_next;
struct　sk_buff*volatile　send_tail;
struct　sk_buff_head　back_log;
struct　sk_buff*partial;
struct　timer_list　partial_timer;
longretransmits;
struct　sk_buff_head　write_queue,
receive_queue;
struct　proto*prot;
struct　wait_queue　**sleep;
__u32　daddr;
__u32　saddr;/*　Sending　source　*/
__u32　rcv_saddr;/*　Bound　address　*/
unsigned　shortmax_unacked;
unsigned　shortwindow;
__u32　lastwin_seq;/*　sequence　number　when　we　last
　updated　the　window　we　offer　*/
__u32　high_seq;　/*　sequence　number　when　we　did
　current　fast　retransmit　*/
volatile　unsigned　longato;/*　ack　timeout　*/
volatile　unsigned　longlrcvtime;　/*　jiffies　at　last　data　rcv　*/
volatile　unsigned　longidletime;　/*　jiffies　at　last　rcv　*/
unsigned　intbytes_rcv;
/*
　*mss　is　min(mtu,　max_window)
　*/
unsigned　shortmtu;/*　mss　negotiated　in　the　syn"s　*/
volatile　unsigned　short　mss;/*　current　eff.　mss　-　can　change　*/
volatile　unsigned　short　user_mss;　/*　mss　requested　by　user　in　ioctl　*/
volatile　unsigned　short　max_window;
unsigned　long　window_clamp;
unsigned　intssthresh;
unsigned　shortnum;
volatile　unsigned　short　cong_window;
volatile　unsigned　short　cong_count;
volatile　unsigned　short　packets_out;
volatile　unsigned　short　shutdown;
volatile　unsigned　longrtt;
volatile　unsigned　longmdev;
volatile　unsigned　longrto;

volatile　unsigned　short　backoff;
int　err,　err_soft;/*　Soft　holds　errors　that　don"t
　cause　failure　but　are　the　cause
　of　a　persistent　failure　not
　just　"timed　out"　*/
unsigned　char　protocol;
volatile　unsigned　charstate;
unsigned　char　ack_backlog;
unsigned　char　max_ack_backlog;
unsigned　char　priority;
unsigned　char　debug;
int　rcvbuf;
int　sndbuf;
unsigned　shorttype;
unsigned　char　localroute;　/*　Route　locally　only　*/
/*
　*This　is　where　all　the　private　(optional)　areas　that　don"t

Linux 核心--16.Linux数据结构( 六 )

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