{"id":293405,"date":"2024-10-04T04:03:43","date_gmt":"2024-10-03T20:03:43","guid":{"rendered":"https:\/\/lrxjmw.cn\/sdjxldmjmwla.html"},"modified":"2024-10-04T04:03:43","modified_gmt":"2024-10-03T20:03:43","slug":"sdjxldmjmwla","status":"publish","type":"post","link":"https:\/\/lrxjmw.cn\/sdjxldmjmwla.html","title":{"rendered":"\u6df1\u5ea6\u89e3\u6790 Linux TCP\/IP \u4ee3\u7801\uff1a\u63ed\u79d8\u7f51\u7edc\u5965\u79d8\u7684\u63a2\u9669\u4e4b\u65c5"},"content":{"rendered":"

\u5728\u8e0f\u4e0a\u8fd9\u5f81\u7a0b\u4e4b\u521d\uff0c\u6709\u5fc5\u8981\u5f3a\u8c03\uff0c\u5bf9Linux<\/a>TCP\/IP\u4ee3\u7801\u7684\u8ddf\u8e2a\u662f\u4e00\u9879\u7e41\u590d\u7684\u4efb\u52a1\u3002\u7136\u800c\uff0c\u8fd9\u5b9e\u5219\u662f\u4e00\u573a\u60ca\u9669\u7684\u63a2\u9669\uff0c\u5176\u4e2d\u8574\u85cf\u7740\u65e0\u6570\u60ca\u559c\u4e0e\u672a\u77e5\u3002\u6bcf\u5f53\u6df1\u5165\u63a2\u7d22\u4ee3\u7801\u7684\u6df1\u6e0a\uff0c\u6211\u90fd\u81ea\u6bd4\u4e3a\u4e00\u4f4d\u52c7\u6562\u7684\u63a2\u9669\u8005\uff0c\u81f4\u529b\u4e8e\u63ed\u9732\u7f51\u7edc\u7684\u5965\u79d8\u3002<\/p>\n

\u4e3a\u4ec0\u4e48\u6211\u4eec\u8981\u8ffd\u8e2aTCP\/IP\u4ee3\u7801\uff1f<\/b><\/p>\n

\u60a8\u6216\u8bb8\u4f1a\u7591\u95ee\uff0c\u4e3a\u4f55\u8981\u5982\u6b64\u52aa\u529b\u8ffd\u8e2aTCP\/IP\u7684\u6e90\u4ee3\u7801\uff1f\u5b9e\u5219\uff0c\u8fd9\u4e0d\u4e9a\u4e8e\u5bfb\u5b9d\u4e8e\u4e00\u7247\u795e\u79d8\u5c9b\u5c7f\u3002\u4f5c\u4e3a\u4e92\u8054\u7f51\u7684\u57fa\u77f3\uff0c\u6df1\u523b\u7406\u89e3TCP\/IP\u7684\u8fd0\u4f5c\u673a\u5236\uff0c\u4fbf\u5982\u540c\u63e1\u6709\u5f00\u542f\u7f51\u7edc\u4e4b\u79d8\u7684\u94a5\u5319\u3002\u6bcf\u5f53\u6211\u5bf9\u8fd9\u4e9b\u6e90\u4ee3\u7801\u8fdb\u884c\u6df1\u5165\u94bb\u7814\uff0c\u603b\u4f1a\u6709\u65b0\u53d1\u73b0\u8ba9\u6211\u6b23\u559c\u82e5\u72c2\u3002<\/p>\n

\u63a2\u7a76TCP\/IP\u6e90\u4ee3\u7801\u8d85\u51fa\u4e86\u6c42\u77e5\u6b32\u7684\u8303\u7574\u3002\u6df1\u5165\u7406\u89e3\u5176\u7ed3\u6784\u5bf9\u9ad8\u6548\u6392\u67e5\u7f51\u7edc\u6545\u969c\u548c\u63d0\u5347\u7f51\u7edc\u6548\u7387\u81f3\u5173\u91cd\u8981\u3002\u8fd9\u76f8\u5f53\u4e8e\u62e5\u6709\u4e86\u4fee\u590d\u7f51\u7edc\u4e16\u754c\u7684\u5f97\u529b\u5de5\u5177\uff0c\u4ee4\u6211\u4eec\u9762\u5bf9\u7f51\u7edc\u95ee\u9898\u66f4\u52a0\u6e38\u5203\u6709\u4f59\u3002<\/p>\n

\u4ece\u54ea\u91cc\u5f00\u59cb\u8ffd\u8e2a\uff1f<\/b><\/p>\n

linux\u8ffd\u8e2a_\u8ffd\u8e2alinux tcp\/ip\u4ee3\u7801\u8fd0\u884c_linux\u8ffd\u8e2a\u8fdb\u7a0b<\/p>\n

\u65e2\u7136\u660e\u786e\u8ffd\u8e2aTCP\/IP\u4ee3\u7801\u7684\u5fc5\u8981\u6027\uff0c\u63a5\u4e0b\u6765\u4fbf\u662f\u5b9a\u4f4d\u8d77\u70b9\u7684\u95ee\u9898\u3002\u72b9\u5982\u63a2\u5bfb\u68ee\u6797\u6df1\u5904\u7684\u5165\u53e3\uff0c\u9996\u8981\u4efb\u52a1\u662f\u5b9a\u4f4dLinux\u5185\u6838\u7684\u6e90\u4ee3\u7801\u3002\u8003\u8651\u5230\u4ee3\u7801\u5e93\u7684\u5e9e\u5927\u4e0e\u67b6\u6784\u7684\u590d\u6742\u6027\uff0c\u8fd9\u65e0\u7591\u662f\u4e00\u9879\u91cd\u5927\u6311\u6218\u3002\u5c3d\u7ba1\u5982\u6b64\uff0c\u6211\u4eec\u53ef\u4ece\u6838\u5fc3\u6587\u4ef6\u548c\u529f\u80fd\u5165\u624b\uff0c\u4f8b\u5982`net\/ipv4\/tcp.c`\u4e0e`net\/ipv4\/ip_output.c`\u7b49\u3002<\/p>\n

\u4e00\u65e6\u6210\u529f\u5b9a\u4f4d\u8fd9\u4e9b\u6587\u6863\uff0c\u6211\u4eec\u5c06\u5f00\u542f\u5bf9TCP\/IP\u6d41\u7a0b\u7684\u8ffd\u8e2a\u4e4b\u65c5\u3002\u8fd9\u4e00\u8fc7\u7a0b\u72b9\u5982\u5728\u5bc6\u6797\u4e2d\u53d1\u73b0\u4e00\u6761\u873f\u8712\u5c0f\u5f84\uff0c\u5c3d\u7ba1\u8def\u5f84\u8fc2\u56de\uff0c\u4f46\u65b9\u5411\u5df2\u7136\u660e\u786e\u3002\u6211\u4eec\u7684\u5206\u6790\u5c06\u59cb\u4e8e\u6570\u636e\u5305\u7684\u63a5\u6536\u4e0e\u53d1\u9001\uff0c\u5e76\u9010\u6b65\u62d3\u5c55\u81f3TCP\u534f\u8bae\u7684\u8fde\u63a5\u5efa\u7acb\u3001\u6570\u636e\u4f20\u8f93\u4ee5\u53ca\u8fde\u63a5\u7ec8\u7ed3\u7b49\u5173\u952e\u73af\u8282\u3002<\/p>\n

\u8ffd\u8e2aTCP\u8fde\u63a5\u7684\u5efa\u7acb<\/b><\/p>\n

\u76d1\u63a7TCP\u8fde\u63a5\u7684\u521d\u59cb\u5316\u8fc7\u7a0b\u5b9b\u5982\u76ee\u7779\u4e00\u573a\u60c5\u7f18\u7684\u5f00\u59cb\u3002\u8d77\u521d\uff0c\u5ba2\u6237\u7aef\u53d1\u9001SYN\u5305\u4ee5\u53d1\u8d77\u8fde\u63a5\u8bf7\u6c42\u3002\u670d\u52a1\u5668\u54cd\u5e94\u4ee5SYN-ACK\u5305\uff0c\u8868\u660e\u540c\u610f\u8fde\u63a5\u3002\u968f\u540e\uff0c\u5ba2\u6237\u7aef\u518d\u56de\u9001ACK\u5305\uff0c\u5b8c\u6210\u8fde\u63a5\u5efa\u7acb\u3002\u5c3d\u7ba1\u6b65\u9aa4\u7b80\u6d01\uff0c\u5176\u80cc\u540e\u5374\u6d89\u53ca\u7e41\u590d\u7684\u7f16\u7801\u673a\u5236\u3002<\/p>\n

\u4e8e\u4ee3\u7801\u5c42\u9762linux\u8fd0\u7ef4\u6700\u4f73\u5b9e\u8df5\uff0c`tcp_v4_connect`\u51fd\u6570\u6267\u884cSYN\u6570\u636e\u5305\u7684\u53d1\u9001\uff0c`tcp_rcv_state_process`\u51fd\u6570\u4e13\u6ce8\u4e8e\u63a5\u6536\u5e76\u5904\u7406SYN-ACK\u6570\u636e\u5305\uff0c\u800c`tcp_send_ack`\u51fd\u6570\u5219\u8d1f\u8d23\u53d1\u9001\u786e\u8ba4\u7684ACK\u6570\u636e\u5305\u3002\u8fd9\u4e9b\u51fd\u6570\u7684\u8c03\u7528\u5e8f\u5217\u6784\u6210\u4e86\u8fde\u63a5\u5efa\u7acb\u8fc7\u7a0b\u4e2d\u7684\u91cd\u8981\u73af\u8282\uff0c\u4f7f\u6211\u4eec\u80fd\u591f\u76f4\u89c2\u5730\u8ffd\u8e2a\u6574\u4e2a\u6d41\u7a0b\u3002<\/p>\n

\u8ffd\u8e2a\u6570\u636e\u4f20\u8f93\u7684\u8fc7\u7a0b<\/b><\/p>\n

linux\u8ffd\u8e2a\u8fdb\u7a0b_linux\u8ffd\u8e2a_\u8ffd\u8e2alinux tcp\/ip\u4ee3\u7801\u8fd0\u884c<\/p>\n

\u5efa\u7acb\u8fde\u63a5\u540e\uff0c\u968f\u5373\u542f\u52a8\u6570\u636e\u4f20\u8f93\u73af\u8282\u3002\u6b64\u8fc7\u7a0b\u72b9\u5982\u7535\u8bdd\u5bf9\u8bdd\uff0c\u53cc\u65b9\u4ea4\u66ff\u53d1\u8a00\uff0c\u4fe1\u606f\u5728\u7ebf\u8def\u4e0a\u5f80\u8fd4\u4f20\u8f93\u3002Linux\u5185\u6838\u4e2d\uff0c\u8be5\u4f20\u8f93\u73af\u8282\u4e3b\u8981\u7531`tcp_sendmsg`\u4e0e`tcp_recvmsg`\u51fd\u6570\u627f\u62c5\u6838\u5fc3\u4efb\u52a1\u3002`tcp_sendmsg`\u51fd\u6570\u8d1f\u8d23\u5c06\u7528\u6237\u6570\u636e\u62f7\u8d1d\u81f3\u5185\u6838\u9886\u57df\uff0c\u5e76\u5c01\u88c5\u4e3aTCP\u6570\u636e\u5305\u53d1\u9001\uff1b`tcp_recvmsg`\u51fd\u6570\u5219\u4e13\u8d23\u63a5\u6536\u6570\u636e\u5305\uff0c\u8fdb\u884c\u89e3\u5c01\u88c5\u5e76\u5c06\u4fe1\u606f\u8fd4\u56de\u81f3\u7528\u6237\u7a7a\u95f4\u3002<\/p>\n

\u5728\u6b64\u6d41\u7a0b\u4e2d\uff0cTCP\u534f\u8bae\u6267\u884c\u6d41\u91cf\u4e0e\u62e5\u585e\u7ba1\u7406\uff0c\u4ee5\u4fdd\u969c\u6570\u636e\u7684\u6d41\u7545\u4ea4\u6362\u3002\u6b64\u60c5\u5f62\u582a\u6bd4\u53cc\u65b9\u5bf9\u8bdd\u65f6\u4f9d\u636e\u5f7c\u6b64\u53cd\u9988\u8c03\u6574\u4ea4\u6d41\u901f\u5ea6\u4e0e\u5185\u5bb9\uff0c\u4ee5\u4fc3\u4ea4\u8c08\u987a\u7545\u3002\u5177\u4f53\u5230\u7f16\u7801\u5c42\u9762\uff0c`tcp_write_xmit`\u51fd\u6570\u8d1f\u8d23\u6570\u636e\u5305\u7684\u4f20\u8f93\uff0c`tcp_data_queue`\u51fd\u6570\u4e13\u804c\u63a5\u6536\u6570\u636e\u5305\uff0c\u800c`tcp_retransmit_timer`\u51fd\u6570\u5219\u5173\u4e4e\u6570\u636e\u91cd\u4f20\u7684\u5904\u7406\u3002<\/p>\n

\u8ffd\u8e2a\u8fde\u63a5\u7684\u5173\u95ed<\/b><\/p>\n

\u8ffd\u8e2alinux tcp\/ip\u4ee3\u7801\u8fd0\u884c_linux\u8ffd\u8e2a\u8fdb\u7a0b_linux\u8ffd\u8e2a<\/p>\n

\u5728\u5b8c\u6210\u6570\u636e\u4f20\u8f93\u540e\uff0c\u987b\u7ec8\u6b62\u8fde\u63a5\uff0c\u6b64\u8fc7\u7a0b\u7c7b\u4f3c\u5bf9\u8bdd\u7ed3\u675f\u65f6\u7684\u793c\u8c8c\u544a\u522b\u3002\u5728TCP\u534f\u8bae\u4e0b\u8ffd\u8e2alinux tcp\/ip\u4ee3\u7801\u8fd0\u884c<\/strong>\uff0c\u6b64\u65ad\u5f00\u6d41\u7a0b\u79f0\u4e3a\u56db\u6b21\u6325\u624b\u3002\u8fc7\u7a0b\u59cb\u4e8e\u53d1\u8d77\u7aef\u53d1\u9001FIN\u5305\uff0c\u8868\u660e\u6570\u636e\u4f20\u8f93\u5b8c\u6bd5\u3002\u63a5\u6536\u7aef\u63a5\u6536\u5230FIN\u5305\u540e\u56de\u5e94ACK\u5305\u3002\u968f\u540e\uff0c\u63a5\u6536\u7aef\u4e5f\u53d1\u9001FIN\u5305redhat linux\uff0c\u58f0\u660e\u81ea\u8eab\u4e5f\u5df2\u65e0\u6570\u636e\u53d1\u9001\u3002\u6700\u7ec8\uff0c\u53d1\u8d77\u7aef\u786e\u8ba4\u6536\u5230FIN\u5305\uff0c\u5e76\u4ee5ACK\u5305\u56de\u6267\uff0c\u4ece\u800c\u5b8c\u6210\u8fde\u63a5\u7684\u6b63\u5f0f\u65ad\u5f00\u3002<\/p>\n

\u8ffd\u8e2a\u8fc7\u7a0b\u4e2d\u7684\u6311\u6218<\/b><\/p>\n

\u8ffd\u8e2aTCP\/IP\u4ee3\u7801\u7684\u5386\u7a0b\u5f80\u5f80\u4f34\u968f\u4e0d\u5c11\u6311\u6218\uff0c\u72b9\u5982\u63a2\u9669\u9014\u4e2d\u906d\u9047\u91cd\u91cd\u96be\u5173\u3002\u4ee3\u7801\u7684\u7e41\u6742\u6027\u6784\u6210\u4e86\u9996\u5f53\u5176\u51b2\u7684\u6311\u6218\uff0cLinux\u5185\u6838\u5e9e\u5927\u4e14\u7ed3\u6784\u590d\u6742\uff0c\u6709\u65f6\u4eba\u4eec\u5728\u4ee3\u7801\u8ff7\u96fe\u4e2d\u96be\u4ee5\u5b9a\u4f4d\u3002\u518d\u8005\uff0c\u8c03\u8bd5\u5de5\u5177\u7684\u8fd0\u7528\u4ea6\u662f\u4e00\u5927\u96be\u9898\u3002\u5c3d\u7ba1`gdb`\u548c`strace`\u7b49\u8c03\u8bd5\u5de5\u5177\u529f\u80fd\u5f3a\u5927\uff0c\u4f46\u7cbe\u786e\u8fd0\u7528\u5b83\u4eec\u5b9a\u4f4d\u95ee\u9898\u6839\u6e90\u5374\u975e\u6613\u4e8b\u3002<\/p>\n

linux\u8ffd\u8e2a\u8fdb\u7a0b_\u8ffd\u8e2alinux tcp\/ip\u4ee3\u7801\u8fd0\u884c_linux\u8ffd\u8e2a<\/p>\n

\u6b63\u662f\u8fd9\u4e9b\u6311\u6218\uff0c\u4f7f\u5f97\u8ffd\u8e2aTCP\/IP\u4ee3\u7801\u7684\u8fdb\u7a0b\u5145\u6ee1\u8da3\u5473\u4e0e\u4ef7\u503c\u3002\u6bcf\u89e3\u51b3\u96be\u9898\uff0c\u6316\u6398\u95ee\u9898\u6838\u5fc3\uff0c\u5747\u5e26\u6765\u6781\u5927\u7684\u6210\u5c31\u611f\u3002\u8fd9\u79cd\u611f\u89c9\u5b9b\u5982\u63a2\u9669\u5bb6\u5386\u7ecf\u8270\u8f9b\u7ec8\u83b7\u5b9d\u85cf\u7684\u559c\u60a6\u3002<\/p>\n

\u603b\u7ed3\u4e0e\u5c55\u671b<\/b><\/p>\n

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