{"id":860,"date":"2022-02-21T20:20:22","date_gmt":"2022-02-21T12:20:22","guid":{"rendered":"https:\/\/www.xianwaizhiyin.net\/?p=860"},"modified":"2022-06-11T02:48:08","modified_gmt":"2022-06-10T18:48:08","slug":"%e5%9b%9e%e7%8e%af%e5%a4%84%e7%90%86","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=860","title":{"rendered":"\u56de\u73af\u5904\u7406"},"content":{"rendered":"\n

\u672c\u4e66 \u300a\u7f51\u7edc\u534f\u8bae\u6808\u5165\u95e8\u300b \u91c7\u7528\u7684\u4ee3\u7801\u662f \u57fa\u4e8e linux \u5185\u6838 4.4.4 \u7248\u672c\u7684\u3002linux \u5185\u6838\u6e90\u7801\u4e0b\u8f7d\u5730\u5740\uff1a mirrors.edge.kernel.org<\/a><\/p>\n\n\n\n

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\u5728\u5e94\u7528\u5c42\u7f51\u7edc\u534f\u8bae\u91cc\u9762\uff0c\u7ecf\u5e38\u4f1a\u770b\u5230 \u8fd9\u6837\u4e00\u4e2a\u8bcd\uff0cwraparound\uff0c\u56de\u73af\u5904\u7406\u3002<\/p>\n\n\n\n

TCP \u7684 sequence\uff0cRTMP \u7684\u65f6\u95f4\u6233\uff0c \u7b49\u7b49\uff0c\u90fd\u9700\u8981\u505a handling wraparound \uff0c\u56de\u73af\u5904\u7406\u3002<\/p>\n\n\n\n

\u90a3\u4ec0\u4e48\u662f\u56de\u73af\u5904\u7406\u5462\uff1f<\/p>\n\n\n\n

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google_ads_content<\/p>\n\n\n\n

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\u6211\u4eec\u77e5\u9053 TCP \u7684 sequence number \u5e8f\u5217\u53f7\u662f\u4e0d\u65ad\u6839\u636e\u53d1\u9001\u6570\u636e\u5305\u7684\u957f\u5ea6\u4e0d\u65ad \u9012\u589e\u7684\uff0c\u5982\u4e0b\u56fe\uff1a<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u51fa\uff0c TCP \u7684 sequence number \u5b57\u6bb5\uff0c\u53ea\u7528\u4e86 4 \u4e2a\u5b57\u8282\u6765\u5b58\u50a8\uff0c\u4e5f\u5c31\u662f\u8bf4 sequence number \u662f\u4e00\u4e2a 32\u4f4d\u7684\u6570\u5b57\uff0c\u6700\u5927\u503c 2^32 = 4294967296\u3002<\/p>\n\n\n\n

\u8fd9\u662f\u4e0d\u662f\u610f\u5473\u7740 TCP \u6700\u591a\u53ea\u80fd\u4f20 4294967296 \u5b57\u8282\u7684\u6570\u636e\uff0c\u4e0d\u662f\u7684\uff0cTCP \u9488\u5bf9\u8fd9\u4e2a\u95ee\u9898\u505a\u4e86\u56de\u73af\u5904\u7406\u3002<\/p>\n\n\n\n

TCP \u7684 sequence number \u4e3b\u8981\u7528\u6765\u5224\u65ad\u91cd\u4f20\u6570\u636e\u5305\uff0c\u56e0\u4e3a\u56de\u73af\u5904\u7406\u4e3b\u8981\u662f\u4e3a\u4e86 \u91cd\u4f20\u670d\u52a1\u7684\uff0c\u6240\u4ee5\u5728\u8fd9\u91cc\u7b80\u5355\u8bb2\u89e3\u4e00\u4e0b TCP seq + ack \u8ddf \u91cd\u4f20\u7684\u673a\u5236\u3002<\/p>\n\n\n\n

\u4e0a\u56fe\u4e2d \u7b2c 6 \uff0c\u7b2c 7\u4e2a\u6570\u636e\u5305\uff0c\u53ef\u4ee5\u770b\u5230 \u670d\u52a1\u5668\u8fde\u7eed\u53d1\u4e86 \u4e24\u4e2a TCP \u6570\u636e\u5305\uff0c\u7b2c6\u4e2a\u5305\u7684 seq \u662f1\uff0cTCP body\u662f 1412 \u5b57\u8282\u3002\u7b2c7\u4e2a\u5305\u7684 seq \u662f1413\uff0cTCP body\u662f 1412 \u5b57\u8282\u3002<\/p>\n\n\n\n

\u7136\u540e \u7b2c 8 \u4e2a\u5305 \u5ba2\u6237\u7aef\u56de\u590d\u4e86\u4e00\u4e2a ACK\uff0c\u7b2c8\u4e2a\u5305\u7684 seq \u662f86\uff0cACK \u7b49\u4e8e 2825\uff0cACK \u7b49\u4e8e 2825<\/strong> \u8fd9\u4e2a\u503c\u7279\u522b\u91cd\u8981\uff0c\u4ed6\u4ee3\u8868\u5ba2\u6237\u7aef\u5df2\u7ecf\u62ff\u5230\u4e86 0~2825\u5b57\u8282\u7684\u6570\u636e\u3002<\/p>\n\n\n\n

\u8fd9\u662f TCP \u7684\u4f18\u5316\u673a\u5236\uff0c\u4ed6\u4e0d\u662f\u6bcf\u53d1\u4e00\u4e2a TCP \u5305\u5c31\u7b49\u4e00\u4e2a ACK \u518d\u53d1\u4e00\u4e2a TCP \u5305\uff0c\u800c\u662f\u5728\u6ed1\u52a8\u7a97\u53e3\u5185\uff0c\u53ef\u4ee5\u8fde\u7eed\u53d1\u591a\u4e2aTCP\u5305\uff0c\u7136\u540e\u5ba2\u6237\u7aef\u7edf\u4e00\u786e\u8ba4\u3002<\/p>\n\n\n\n

\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u5230\uff0c\u5ba2\u6237\u7aef\u4e00\u4e2aACk \u5c31\u786e\u8ba4\u4e86 \u670d\u52a1\u5668\u7684\u4e24\u4e2aTCP\u5305\u90fd\u6536\u5230\u4e86\uff0c\u8282\u7701\u4e86\u5f00\u9500\u3002<\/p>\n\n\n\n

\u5c31\u662f\u4e0a\u9762\u8fd9\u4e48\u4e00\u4e2a\u60c5\u51b5\uff0c\u7136\u540e\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u5ba2\u6237\u7aef\u670d\u52a1\u5668\u5df2\u7ecf\u4f20\u8f93\u4e86\u5f88\u591a\u6570\u636e\uff0c\u670d\u52a1\u5668\u53d1\u7684\u7b2c1\u4e07\u4e2a\u5305 seq \u7b49\u4e8e 4294967290\uff0cTCP body\u662f 1412 \u5b57\u8282\u3002<\/p>\n\n\n\n

\u670d\u52a1\u5668\u53d1\u7684\u7b2c1\u4e07\u4e2a\u5305 seq \u8fd8\u5dee6\u5c31\u5230\u8fbe\u6781\u9650\u4e86\uff0c\u6211\u4eec\u77e5\u9053 \u5ba2\u6237\u7aef\u56de\u590d\u7684 ACK \u7b49\u4e8e seq + TCP body \u7684\u957f\u5ea6\uff0c\u4e5f\u5c31\u662f 4294967290+1412\u3002<\/p>\n\n\n\n

\u4f46\u662f 4294967290+1412 \u5df2\u7ecf\u8d85\u8fc7 32\u4f4d\u4e86\uff0c\u5c31\u4f1a\u4ea7\u751f\u56de\u73af\uff0c\u5ba2\u6237\u7aef\u56de\u590d\u7684 ACK \u662f 1406\u3002 \u662f\u65e0\u7b26\u53f7\u7684\u3002<\/p>\n\n\n\n

\u670d\u52a1\u5668\u7aef\u7ef4\u62a4\u4e86\u4e00\u4e2a\u672a\u786e\u8ba4\u7684 TCP \u5305\u5217\u8868\uff0c\u6536\u5230\u76f8\u5e94\u7684ACK\u786e\u8ba4 \u624d\u4f1a\u628aTCP \u5305\u91ca\u653e\u5185\u5b58\u3002\u7136\u540e\u670d\u52a1\u5668\u7aef\u6536\u5230 ACK = 1046 \uff0c\u670d\u52a1\u5668\u600e\u4e48\u5224\u65ad\uff0c\u7136\u540e\u77e5\u9053\u7b2c 1\u4e07\u4e2a\u5305\u5df2\u7ecf\u88ab \u5ba2\u6237\u7aef\u62ff\u5230\u4e86\u5462\uff1f<\/p>\n\n\n\n

\u7b2c1\u4e07\u4e2a\u5305\u7684 seq \u662f 4294967290\uff0c4294967290 \u5927\u4e8e 1046 \uff0c\u6240\u4ee5\u6ca1\u6cd5\u8fd9\u4e48\u7b80\u5355\u5730\u5224\u65ad\u3002\u8fd9\u65f6\u5019\u5c31\u9700\u8981\u7528\u5230\u56de\u73af\u7b97\u6cd5\uff0c\u8fd9\u4e2a\u7b97\u6cd5\u7684\u4ee3\u7801\u662f\u8fd9\u6837\u7684\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n

\/*\n* The next routines deal with comparing 32 bit unsigned ints\n* and worry about wraparound (automatic with unsigned arithmetic).\n*\/\n#include <stdio.h>\n\u200b\nstatic inline int before(unsigned int seq1, unsigned int seq2)\n{\n    return (signed int)(seq1-seq2) < 0;\n}\n\u200b\nint main() {\n    unsigned int seq = 4294967290;\n    unsigned int ack = seq + 1412 ;\n    printf("ack \u7b49\u4e8e %u \\r\\n",ack);\n    \n    if( before(seq,ack) ){\n        printf("seq \u5bf9\u5e94\u7684TCP\u5305\u53ef\u4ee5\u91ca\u653e\\n");\n    }else{\n        printf("seq \u5bf9\u5e94\u7684TCP\u5305\u4e0d\u80fd\u91ca\u653e\\n");\n    }\n\u200b\n    return 0;\n}<\/code><\/pre>\n\n\n\n
\u4e0a\u9762\u7684\u7b97\u6cd5\uff0c\u662f linux \u5185\u6838\u7684\u4e00\u4e2a\u7b97\u6cd5\uff0c\u6211\u505a\u4e86\u4e00\u70b9\u6539\u5584\uff0cint \u662f\u4e00\u4e2a 4 \u5b57\u8282\u7684\u7c7b\u578b\u3002\u7136\u540e\u5b9a\u4e49\u4e86\u4e00\u4e2a before()<\/code> \u51fd\u6570\uff0cbefore()<\/code> \u51fd\u6570 \u7684\u4f5c\u7528\u662f\u8fd9\u6837\u7684\uff0c<\/p>\n\n\n\n
seq1 \u5982\u679c\u5728 seq2 \u7684\u524d\u9762\uff0cbefore()<\/code> \u5c31\u4f1a\u8fd4\u56de true\uff0c\u8981\u4e0d\u5c31\u662f false\u3002\u4e0a\u9762\u4ee3\u7801\u8fd0\u884c\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u53ef\u4ee5\u770b\u5230\uff0c\u8fd9\u4e2a before()<\/code> \u51fd\u6570 \u786e\u5b9e\u597d\u4f7f\u3002\u518d\u7528\u5176\u4ed6\u7684ack \u503c\u6d4b\u8bd5\u4e00\u4e0b\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n
#include <stdio.h>\n\u200b\nstatic inline int before(unsigned int seq1, unsigned int seq2)\n{\n    return (signed int)(seq1-seq2) < 0;\n}\n\u200b\nint main() {\n    unsigned int seq = 4294967290;\n    unsigned int ack = seq + 1412 ;\n    printf("ack \u7b49\u4e8e %u \\r\\n",ack);\n\u200b\n    if( before(seq,ack) ){\n        printf("seq \u5bf9\u5e94\u7684TCP\u5305\u53ef\u4ee5\u91ca\u653e\\n");\n    }else{\n        printf("seq \u5bf9\u5e94\u7684TCP\u5305\u4e0d\u80fd\u91ca\u653e\\n");\n    }\n\u200b\n    ack = 4294967293;\n    printf("ack \u7b49\u4e8e %u \\r\\n",ack);\n    if( before(seq,ack) ){\n        printf("seq \u5bf9\u5e94\u7684TCP\u5305\u53ef\u4ee5\u91ca\u653e\\n");\n    }else{\n        printf("seq \u5bf9\u5e94\u7684TCP\u5305\u4e0d\u80fd\u91ca\u653e\\n");\n    }\n\u200b\n    ack = 4294967285;\n    printf("ack \u7b49\u4e8e %u \\r\\n",ack);\n    if( before(seq,ack) ){\n        printf("seq \u5bf9\u5e94\u7684TCP\u5305\u53ef\u4ee5\u91ca\u653e\\n");\n    }else{\n        printf("seq \u5bf9\u5e94\u7684TCP\u5305\u4e0d\u80fd\u91ca\u653e\\n");\n    }\n    return 0;\n}<\/code><\/pre>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u53ef\u4ee5\u770b\u5230\uff0c\u5bf9\u4e8e\u5176\u4ed6\u7684\u503c\uff0cbefore()<\/code> \u4e5f\u4e00\u6837\u597d\u4f7f\u3002 \u90a3\u4ec0\u4e48\u60c5\u51b5\u4e0b \u8fd9\u4e2a before()<\/code> \u51fd\u6570\u4e0d\u597d\u4f7f\uff0c\u518d\u6765\u770b\u4e00\u4e2a\u4f8b\u5b50\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n
static inline int before(unsigned int seq1, unsigned int seq2)\n{\n    return (signed int)(seq1-seq2) < 0;\n}\n\u200b\nint main() {\n    unsigned int seq = 2147483648 - 1 ;\n    unsigned int ack = 0;\n    printf("ack \u7b49\u4e8e %u \\r\\n",ack);\n    printf("seq \u7b49\u4e8e %u \\r\\n",seq);\n\u200b\n    if( before(seq,ack) ){\n        printf("seq \u5bf9\u5e94\u7684TCP\u5305\u53ef\u4ee5\u91ca\u653e\\n");\n    }else{\n        printf("seq \u5bf9\u5e94\u7684TCP\u5305\u4e0d\u80fd\u91ca\u653e\\n");\n    }\n\u200b\n    return 0;\n}<\/code><\/pre>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u4e0a\u9762\u7684 2147483648 \u662f 2^31 \u8ba1\u7b97\u5f97\u6765\u7684\uff0c\u53ef\u4ee5\u770b\u5230 \u8fd9\u79cd\u60c5\u51b5\u4e0b seq \u5c31\u4e0d\u5728 ack \u4e4b\u524d\u4e86\uff0c\u7136\u540e\u4e0a\u9762\u8fd9\u79cd\u60c5\u51b5\u4ec0\u4e48\u65f6\u5019\u4f1a\u51fa\u73b0\u3002<\/p>\n\n\n\n
\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u5ba2\u6237\u7aef\u670d\u52a1\u5668\u5df2\u7ecf\u4f20\u8f93\u4e86\u5f88\u591a\u6570\u636e\uff0c\u670d\u52a1\u5668\u53d1\u7684\u7b2c5\u5343\u4e2a\u5305 seq \u7b49\u4e8e 2147483647\uff0c\u7136\u540e\u670d\u52a1\u5668\u7ee7\u7eed\u4e0d\u65ad\u53d1\u7b2c5\u5343\u96f6\u4e00\uff0c\u96f6\u4e8c\u4e0d\u65ad\u5730\u53d1\u4e0b\u53bb\uff0c\u4e00\u76f4\u53d1\u5230 \u7b2c1\u4e07\u4e2a\u6570\u636e\u5305\uff0c\u5047\u8bbe\u4ece\u7b2c5\u5343\u4e2a\u5305\u7b97\u8d77\u6765\uff0c\u4e00\u5171\u53d1\u4e86 2147483649 \u4e2a\u5b57\u8282\uff0c\u8fd9\u671f\u95f4 \u5ba2\u6237\u7aef\u6ca1\u6709\u53d1\u8fc7\u4efb\u4f55 ACK \u786e\u8ba4\uff0c\u7136\u540e\u5ba2\u6237\u7aef\u4e00\u6b21\u6027\u786e\u8ba4 2147483649 \u4e2a\u5b57\u8282\uff0c\u7136\u540e\u5ba2\u6237\u7aef\u7684 ACK \u5c31\u7b49\u4e8e2147483647+ 2147483647 \uff0c\u7b49\u4e8e0\u3002<\/p>\n\n\n\n
\u6240\u4ee5\uff0c\u4e0a\u9762\u8fd9\u79cd\u60c5\u51b5\u4f1a\u53d1\u751f\u5417\uff0c\u4e0d\u4f1a\u53d1\u751f\u3002TCP \u7684\u6ed1\u52a8\u7a97\u53e3\u673a\u5236\uff0c\u4e0d\u4f1a\u5bb9\u5fcd\u53d1\u4e862147483649 \u4e2a\u5b57\u8282\u8fd8\u6ca1\u6536\u5230 ACK\uff0cTCP \u53d1\u51e0\u4e2a\u5305\u540e\u5982\u679c\u6ca1\u6536\u5230ACK \uff0c\u6ed1\u52a8\u7a97\u53e3\u5c31\u6ee1\u4e86\uff0c\u6ca1\u6cd5\u518d\u53d1\u6570\u636e\u4e86\uff0c\u6240\u4ee5\u4e0d\u53ef\u80fd\u8fde\u7eed\u53d1 2147483649 \u4e2a\u5b57\u8282 \u6570\u636e\u3002<\/p>\n\n\n\n
\u7b80\u5355\u7406\u89e3\uff0cseq \u8ddfack \u662f\u5728\u6ed1\u52a8\u7a97\u53e3\u673a\u5236\u4e0b \u540c\u6b65\u9012\u589e\u7684\uff0c\u4ed6\u4eec\u4e4b\u95f4\u7684\u5dee\u8ddd\u4e0d\u4f1a\u8d85\u8fc7 2^(32-1) - 1<\/code>\u3002<\/p>\n\n\n\n
\u518d \u7814\u7a76\u4e00\u4e0b before()<\/code> \u51fd\u6570\u7684\u5b9e\u73b0<\/p>\n\n\n\n
static inline int before(unsigned int seq1, unsigned int seq2)\n{\n    return (signed int)(seq1-seq2) < 0;\n}<\/code><\/pre>\n\n\n\n
\u5b83\u628a\u4e00\u4e2a \u65e0\u7b26\u53f7\u6574\u5f62\uff0c\u5f3a\u5236\u8f6c\u6210\u6709\u7b26\u53f7\u7684\u4e86\uff0c\u6240\u4ee5\u56de\u73af\u8ddd\u79bb\u662f 2^(32-1) - 1<\/code>\uff0cseq1 \u8ddf seq2 \u7684\u5dee\u8ddd\u53ea\u8981\u4e0d\u8d85\u8fc7\u8fd9\u4e2a\u503c\u5c31\u6ca1\u95ee\u9898\u3002<\/p>\n\n\n\n
\u5728TCP \u7684\u6ed1\u52a8\u7a97\u53e3\u63a7\u5236\u4e0b\uff0cseq1 \u8ddf seq2 \u7684\u5dee\u8ddd\u4e0d\u53ef\u80fd\u8d85\u8fc7 2^(32-1) - 1<\/code>\uff0c\u6240\u4ee5\u7b97\u6cd5\u53ef\u7528<\/p>\n\n\n\n
\u76f8\u5173\u9605\u8bfb\uff1a<\/p>\n\n\n\n
1\uff0c\u300atcp\u5e8f\u5217\u53f7\u56de\u7ed5\u4e0e\u89e3\u51b3\u300b<\/a><\/p>\n\n\n\n
\n\n\n\n
\u7531\u4e8e\u7b14\u8005\u7684\u6c34\u5e73\u6709\u9650\uff0c \u52a0\u4e4b\u7f16\u5199\u7684\u540c\u65f6\u8fd8\u8981\u53c2\u4e0e\u5f00\u53d1\u5de5\u4f5c\uff0c\u6587\u4e2d\u96be\u514d\u4f1a\u51fa\u73b0\u4e00\u4e9b\u9519\u8bef\u6216\u8005\u4e0d\u51c6\u786e\u7684\u5730\u65b9\uff0c\u6073\u8bf7\u8bfb\u8005\u6279\u8bc4\u6307\u6b63\u3002\u5982\u679c\u8bfb\u8005\u6709\u4efb\u4f55\u5b9d\u8d35\u610f\u89c1\uff0c\u53ef\u4ee5\u52a0\u6211\u5fae\u4fe1 Loken1\u3002QQ\uff1a2338195090\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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