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from:http://blog.chinaunix.net/u2/62281/showart_1096746.html
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ͳÖÐÊÇ·ñÓÐͨ¹ýsocket(AF_PACKET, SOCK_RAW,
..)´´½¨µÄÌ×½Ó×Ö.Èç¹ûÓеϰ²¢ÇÒЭÒéÏà·û,ÔÚÕâ¸öÀý×ÓÖоÍÊÇÐèÒªETH_P_IP»òÕßETH_P_ALLÀàÐÍ.ϵͳ¾Í¸øÃ¿¸öÕâÑùµÄsocket½ÓÊÕ»º
³åÇø·¢ËÍÒ»¸öÊý¾ÝÖ¡¿½±´.È»ºó½øÈëÏÂÒ»²½.
 
Æä´Î,½øÈëÁËipÊäÈëÀý³Ì(ip²ã»á¶Ô¸ÃÊý¾Ý°ü½øÐÐÈí¹ýÂË,¾ÍÊǼì²éУÑé»òÕß¶ªÆú·Ç±¾»úip»òÕ߹㲥ipµÄÊý¾Ý°üµÈ,¾ßÌåÒª²Î¿¼Ô´´úÂë),Àý×Ó
ÖоÍÊÇÈç¹û³É¹¦µÄ»°»á½øÈëudpÊäÈëÀý³Ì.µ«ÊÇÔÚ½»¸øudpÊäÈëÀý³Ì֮ǰ,ϵͳ»á¼ì²éϵͳÖÐÊÇ·ñÓÐͨ¹ýsocket(AF_INET,
SOCK_RAW,
..)´´½¨µÄÌ×½Ó×Ö.Èç¹ûÓеϰ²¢ÇÒЭÒéÏà·û,ÔÚÕâ¸öÀý×ÓÖоÍÊÇÐèÒªIPPROTO_UDPÀàÐÍ.ϵͳ¾Í¸øÃ¿¸öÕâÑùµÄsocket½ÓÊÕ»º³åÇø·¢ËÍÒ»¸öÊý¾Ý
Ö¡¿½±´.È»ºó½øÈëÏÂÒ»²½.
 
×îºó,½øÈëudpÊäÈëÀý³Ì ...
 
ps:Èç¹ûУÑéºÍ³ö´íµÄ»°,Äں˻áÖ±½Ó¶ªÆú¸ÃÊý¾Ý°üµÄ.¶ø²»»á¿½±´¸øsock_rawµÄÌ×½Ó×Ö,ÒòΪУÑéºÍ¶¼³ö´íÁË,Êý¾Ý¿Ï¶¨ÓÐÎÊÌâµÄ°üÀ¨ËùÓÐÐÅÏ¢¶¼Ã»ÓÐÒâÒåÁË.
 
½øÒ»²½·ÖÎöËûÃǵÄÄÜÁ¦.
1. socket(AF_INET, SOCK_RAW, IPPROTO_UDP);
ÄÜ:¸ÃÌ×½Ó×Ö¿ÉÒÔ½ÓÊÕЭÒéÀàÐÍΪ(tcp udp icmpµÈ)·¢Íù±¾»úµÄipÊý¾Ý°ü,´ÓÉÏÃæ¿´µÄ¾ÍÊÇ20+8+100.
²»ÄÜ:²»ÄÜÊÕµ½·Ç·¢Íù±¾µØipµÄÊý¾Ý°ü(ipÈí¹ýÂ˻ᶪÆúÕâЩ²»ÊÇ·¢Íù±¾»úipµÄÊý¾Ý°ü).
²»ÄÜ:²»ÄÜÊÕµ½´Ó±¾»ú·¢ËͳöÈ¥µÄÊý¾Ý°ü.
·¢Ë͵ϰÐèÒª×Ô¼º×éÖ¯tcp udp icmpµÈÍ·²¿.¿ÉÒÔsetsockoptÀ´×Ô¼º°ü×°ipÍ·²¿
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Oracle Database 10g Release 2 (10.2.0.1) Installation On Red Hat Enterprise Linux 5 (RHEL5)
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int request_irq(unsigned int irq, irq_handler_t handler,
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