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<P class=post>發信人: AngelFalls (TRY IT), 信區: SysInternals<BR>標 題:
[轉載] Linux的TCP/IP協議棧閱讀筆記(7)<BR>發信站: 武漢白云黃鶴站 (Wed Oct 4 01:37:24
2000), 轉信<BR><BR>【 以下文字轉載自 Security 討論區 】<BR>【 原文由 AngelFalls 所發表
】<BR>看看在net/packet/af_packet.c里面的packet_create函數,這個就是通過<BR>packet_proto_init加入的回調函數,假設定義了CONFIG_SOCK_PACKET,代碼<BR>整理如下,這個函數是在用戶創建鏈路層socket的時候被調用的:<BR>static
int packet_create(struct socket *sock, int protocol)<BR>{<BR>struct
sock *sk;<BR>int err;<BR><BR>if (!capable(CAP_NET_RAW))<BR>return
-EPERM;<BR><BR>if (sock->type != SOCK_DGRAM &&
sock->type != SOCK_RAW<BR>&& sock->type !=
SOCK_PACKET<BR>)<BR>return
-ESOCKTNOSUPPORT;<BR>//只有socket(AF_PACKET, [SOCK_DGRAM, SOCK_RAW],
<BR>//或者socket(AF_INET, SOCK_PACKET ,才能調用成功<BR><BR>sock->state =
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