鎮ㄥソ锛屾杩庝締鍒扮董搴浕瀛愬競鍫寸恫(w菐ng)
鐧婚寗 | 鍏嶈不(f猫i)娉ㄥ唺
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銆�銆�姣斿锛屽彲浠ュ埄鐢ㄦ搷浣滅郴绲�(t菕ng)瑕�(gu墨)瀹氱殑ICMP鏁�(sh霉)鎿�(j霉)鍖呭昂瀵镐笉瓒呴亷64KB閫欎竴瑕�(gu墨)瀹�锛屽悜涓绘(j墨)鐧�(f膩)璧封�淧ing of Death鈥濓紙姝讳骸涔婸ing锛夋敾鎿�?锛佺櫃ing of Death鈥� 鏀绘搳鐨勫師鐞嗘槸锛氬鏋淚CMP鏁�(sh霉)鎿�(j霉)鍖呯殑灏哄瓒呴亷64KB涓婇檺鏅�(sh铆)锛屼富姗�(j墨)灏辨渻鍑虹従(xi脿n)鍏�(n猫i)瀛樺垎閰嶉尟(cu貌)瑾�锛屽皫(d菐o)鑷碩CP/IP鍫嗘＇宕╂桨锛岃嚧浣夸富姗�(j墨)姝绘(j墨)銆�
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銆�銆�寰炴妧琛�(sh霉)瑙掑害渚嗚锛孖CMP灏辨槸涓�鍊�(g猫)鈥滈尟(cu貌)瑾ゅ伒娓垏鍥炲牨(b脿o)姗�(j墨)鍒垛��锛屽叾鐩殑灏辨槸璁撴垜鍊戣兘澶犳娓恫(w菐ng)璺殑閫ｇ窔鐙�娉侊箰涔熻兘纰轰繚閫ｇ窔鐨勬簴(zh菙n)纰烘�э箰鍏跺姛鑳戒富瑕佹湁锛�
銆�銆�路 鍋垫脯閬�(yu菐n)绔富姗�(j墨)鏄惁瀛樺湪銆�
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銆�銆�Type 鈥� 閷�(cu貌)瑾ゆ秷鎭垨淇℃伅娑堟伅銆傞尟(cu貌)瑾ゆ秷鎭彲鑳芥槸涓嶅彲鐛插緱鐩(bi膩o)鏂囦欢锛屾暩(sh霉)鎿�(j霉)鍖呭お澶�锛岃秴鏅�(sh铆)锛屽弮鏁�(sh霉)鍟忛绛�?锛熻怠鑹跨敺鐣斺懢顛尖拏鏍＄瘝cho Request銆丒cho Reply銆丟roup Membership Query銆丟roup Membership Report銆丟roup Membership Reduction銆�
銆�銆�Code 鈥� 姣忕ó娑堟伅椤炲瀷鍏锋湁澶氱ó涓嶅悓浠ｇ⒓銆備笉鍙嵅寰楃洰妯�(bi膩o)鏂囦欢姝ｅ紡閫欐ǎ涓�鍊�(g猫)渚嬪瓙锛屽嵆鍏朵腑鍙兘鐨勬秷鎭槸锛氱洰妯�(bi膩o)鏂囦欢娌掓湁璺敱锛岀姝㈣垏鐩(bi膩o)鏂囦欢鐨勯�氫俊锛岄潪閯板眳锛屼笉鍙嵅寰楀湴鍧�锛屼笉鍙嵅寰楃鍙ｃ�傚叿楂旂窗(x矛)绡�(ji茅)璜嬪弮鐓х浉闂�(gu膩n)妯�(bi膩o)婧�(zh菙n)銆�
銆�銆�Checksum 鈥� 瑷�(j矛)绠楁牎椹�(y脿n)鍜屾檪(sh铆)锛孋hecksum 瀛楁瑷�(sh猫)缃偤0銆�
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銆�銆�Address Mask 鈥� 32浣嶆帺纰煎湴鍧�銆�
銆�銆�unsignedshortchksum(addr,len) 銆�銆�unsignedshort*addr;/*鏍￠(y脿n)鏁�(sh霉)鎿�(j霉)闁嬪鍦板潃锛堟敞鎰忔槸浠�2瀛楃瘈(ji茅)鐐哄柈浣嶏級*/ 銆�銆�intlen;/*鏍￠(y脿n)鏁�(sh霉)鎿�(j霉)鐨勯暦搴﹀ぇ灏�锛屼互瀛楃瘈(ji茅)鐐哄柈浣�*/ 銆�銆�{ 銆�銆�intsum=0;/*鏍￠(y脿n)鍜�*/ 銆�銆�intnleft=len;/*鏈疮鍔犵殑鏁�(sh霉)鎿�(j霉)闀峰害*/ 銆�銆�unsignedshort*p;/*璧板嫊鐨勮嚚鏅�(sh铆)鎸囬嚌,2瀛楃瘈(ji茅)鐐哄柈浣�*/ 銆�銆�unsignedshorttmp=0;/*濂囨暩(sh霉)瀛楃瘈(ji茅)闀峰害鏅�(sh铆)鐢ㄥ埌*/ 銆�銆�while(nleft>1) 銆�銆�{ 銆�銆�sum+=*p++;/*绱姞*/ 銆�銆�nleft-=2; 銆�銆�} 銆�銆�if(nleft==1)/*濂囨暩(sh霉)瀛楃瘈(ji茅)闀峰害*/ 銆�銆�{ 銆�銆�*(unsignedchar*)&tmp=*(&(unsignedchar*)p);/*灏囧瓧绡�(ji茅)澹撳2瀛楃瘈(ji茅)鐨勯珮浣�*/ 銆�銆�sum+=tmp; 銆�銆�} 銆�銆�sum+=(sum>>16)+(sum&0xffff);/*楂樹綅浣庝綅鐩稿姞*/ 銆�銆�sum+=sum>>16;/*涓婁竴姝ユ孩鍑烘檪(sh铆)锛屽皣婧㈠嚭浣嶄篃鍔犲埌sum涓�*/ 銆�銆�tmp=~sum;/*娉ㄦ剰椤炲瀷杞�(zhu菐n)鎻�锛岀従(xi脿n)鍦ㄧ殑鏍￠(y脿n)鍜岀偤16浣�*/ 銆�銆�returntmp; 銆�銆�}
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