📄 [转载] linux的tcp-ip协议栈阅读笔记(3) - china linux forum.htm
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<P class=post>发信人: AngelFalls (TRY IT), 信区: SysInternals<BR>标 题:
[转载] Linux的TCP/IP协议栈阅读笔记(3)<BR>发信站: 武汉白云黄鹤站 (Wed Oct 4 01:36:27
2000), 转信<BR><BR>【 以下文字转载自 Security 讨论区 】<BR>【 原文由 AngelFalls 所发表
】<BR>其中的sock_register函数的作用已经在前面说了，现在来看看<BR>struct
inet_protocol和inet_add_protocol函数。前面的结构体<BR>是在include/net/protocol.h里面：<BR>struct
inet_protocol <BR>{<BR>int (*handler)(struct sk_buff *skb, unsigned
short len);<BR>void (*err_handler)(struct sk_buff *skb, unsigned
char *dp, int len);<BR>struct inet_protocol *next;<BR>unsigned char
protocol;<BR>unsigned char copy:1;<BR>void *data;<BR>const char
*name;<BR>};<BR>第一个函数是用来接收数据的callback函数，第二个是错误处理函数，<BR>其它的copy是用来协议共享的，这个以后再说，data当然就是这个结<BR>构体的私有数据了。<BR><BR>inet_add_protocol函数是在net/ipv4/protocol.c里面的：<BR>void
inet_add_protocol(struct inet_protocol *prot)<BR>{<BR>unsigned char
hash;<BR>struct inet_protocol *p2;<BR><BR>hash = prot->protocol
& (MAX_INET_PROTOS - 1);<BR>prot ->next =
inet_protos[hash];<BR>inet_protos[hash] = prot;<BR>prot->copy =
0;<BR><BR>p2 = (struct inet_protocol *) prot->next;<BR>while(p2
!= NULL) <BR>{<BR>if (p2->protocol == prot->protocol)
<BR>{<BR>prot->copy = 1;<BR>break;<BR>}<BR>p2 = (struct
inet_protocol *)
p2->next;<BR>}<BR>}<BR>显然这个函数就是作乐一个hash表，然后每个hash表项都是一个链表头，<BR>然后通过这个hash表加链表的方式访问每个协议结构体。在这里你也见<BR>到了copy成员的用法了把。<BR><BR>arp_init函数是在net/ipv4/arp.c里面的(假定没有定义CONFIG_SYSCTL)：<BR><BR>neigh_table_init(&arp_tbl);<BR>dev_add_pack(&arp_packet_type);<BR>proc_net_register(&proc_net_arp);<BR><BR>不知道是不是有人眼睛一亮啊，呵呵，看到了dev_add_pack函数。<BR>还是一步步来把。<BR>neigh_table_init函数在net/core/neighbour.c中间：<BR>void
neigh_table_init(struct neigh_table *tbl)<BR>{<BR>unsigned long now
= jiffies;<BR><BR>tbl->parms.reachable_time =
neigh_rand_reach_time(<BR>tbl->parms.base_reachable_time);<BR><BR>init_timer(&tbl->gc_timer);<BR>tbl->gc_timer.data
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