{"id":5667,"date":"2022-02-22T19:25:41","date_gmt":"2022-02-22T11:25:41","guid":{"rendered":"https:\/\/damogame.cn:15443\/wordpress\/?p=5667"},"modified":"2022-02-22T19:25:41","modified_gmt":"2022-02-22T11:25:41","slug":"quic%e5%8d%8f%e8%ae%ae%e5%88%9d%e6%8e%a2","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/5667","title":{"rendered":"QUIC\u534f\u8bae\u521d\u63a2"},"content":{"rendered":"
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\u539f\u6587\u5730\u5740<\/a><\/p>\n

 <\/p>\n<\/div>\n<\/div>\n<\/div>\n

\n
\n
\n

<\/a>1\u3001QUIC\u4ecb\u7ecd<\/h2>\n

<\/a>\uff081\uff09QUIC\uff08Quick UDP Internet Connections\uff09\u534f\u8bae<\/h3>\n

\u662f\u4e00\u79cd\u5168\u65b0\u7684\u57fa\u4e8eUDP\u7684web\u5f00\u53d1\u534f\u8bae\u3002\u53ef\u4ee5\u7528\u4e00\u4e2a\u516c\u5f0f\u5927\u81f4\u6982\u62ec\uff1a<\/p>\n

TCP + TLS + HTTP2 = UDP + QUIC + HTTP2\u2019s API<\/p>\n

\u4ece\u516c\u5f0f\u53ef\u770b\u51fa\uff1aQUIC\u534f\u8bae\u867d\u7136\u662f\u57fa\u4e8eUDP\uff0c\u4f46\u5b83\u4e0d\u4f46\u5177\u6709TCP\u7684\u53ef\u9760\u6027\u3001\u62e5\u585e\u63a7\u5236\u3001\u6d41\u91cf\u63a7\u5236\u7b49\uff0c\u4e14\u5728TCP\u534f\u8bae\u7684\u57fa\u7840\u4e0a\u505a\u4e86\u4e00\u4e9b\u6539\u8fdb\uff0c\u6bd4\u5982\u907f\u514d\u4e86\u961f\u9996\u963b\u585e\uff1b\u53e6\u5916\uff0cQUIC\u534f\u8bae\u5177\u6709TLS\u7684\u5b89\u5168\u4f20\u8f93\u7279\u6027\uff0c\u5b9e\u73b0\u4e86TLS\u7684\u4fdd\u5bc6\u529f\u80fd\uff0c\u540c\u65f6\u53c8\u4f7f\u7528\u66f4\u5c11\u7684RTT\u5efa\u7acb\u5b89\u5168\u7684\u4f1a\u8bdd\u3002<\/p>\n

<\/a>\uff082\uff09QUIC\u534f\u8bae\u7684\u4e3b\u8981\u76ee\u7684<\/h3>\n

\u662f\u4e3a\u4e86\u6574\u5408TCP\u534f\u8bae\u7684\u53ef\u9760\u6027\u548cUDP\u534f\u8bae\u7684\u901f\u5ea6\u548c\u6548\u7387\u3002<\/p>\n

QUIC\u7684\u7ef4\u57fa\u767e\u79d1\u9875\u9762\u7684\u4ecb\u7ecd\uff1a<\/p>\n

QUIC\u662f\u5feb\u901fUDP\u7f51\u7edc\u8fde\u63a5\uff08\u82f1\u8bed\uff1aQuick UDP Internet Connections\uff09\u7684\u7f29\u5199\uff0c\u8fd9\u662f\u4e00\u79cd\u5b9e\u9a8c\u6027\u7684\u4f20\u8f93\u5c42\u7f51\u7edc\u4f20\u8f93\u534f\u8bae\uff0c\u7531Google\u516c\u53f8\u5f00\u53d1\uff0c\u57282013\u5e74\u5b9e\u73b0\u3002QUIC\u4f7f\u7528UDP\u534f\u8bae\uff0c\u5b83\u5728\u4e24\u4e2a\u7aef\u70b9\u95f4\u521b\u5efa\u8fde\u63a5\uff0c\u4e14\u652f\u6301\u591a\u8def\u590d\u7528\u8fde\u63a5\u3002\u5728\u8bbe\u8ba1\u4e4b\u521d\uff0cQUIC\u5e0c\u671b\u80fd\u591f\u63d0\u4f9b\u7b49\u540c\u4e8eSSL\/TLS\u5c42\u7ea7\u7684\u7f51\u7edc\u5b89\u5168\u4fdd\u62a4\uff0c\u51cf\u5c11\u6570\u636e\u4f20\u8f93\u53ca\u521b\u5efa\u8fde\u63a5\u65f6\u7684\u5ef6\u8fdf\u65f6\u95f4\uff0c\u53cc\u5411\u63a7\u5236\u5e26\u5bbd\uff0c\u4ee5\u907f\u514d\u7f51\u7edc\u62e5\u585e\u3002Google\u5e0c\u671b\u4f7f\u7528\u8fd9\u4e2a\u534f\u8bae\u6765\u53d6\u4ee3TCP\u534f\u8bae\uff0c\u4f7f\u7f51\u9875\u4f20\u8f93\u901f\u5ea6\u52a0\u5feb\uff0c\u8ba1\u5212\u5c06QUIC\u63d0\u4ea4\u81f3\u4e92\u8054\u7f51\u5de5\u7a0b\u4efb\u52a1\u5c0f\u7ec4\uff08IETF\uff09\uff0c\u8ba9\u5b83\u6210\u4e3a\u4e0b\u4e00\u4ee3\u7684\u6b63\u5f0f\u7f51\u7edc\u89c4\u8303\u3002<\/p>\n

<\/a><\/h3>\n

<\/a>\uff083\uff09QUIC\u7684\u7279\u6027<\/h3>\n

1\uff09\u4f4e\u5ef6\u8fdf\u8fde\u63a5\u7684\u5efa\u7acb (Connection Establishment Latency)<\/p>\n

\u8fd9\u5bf9\u5df2\u5efa\u7acb\u7684\u8fde\u63a5\u5f88\u6709\u597d\u5904\u3002<\/p>\n

\u4f17\u6240\u5468\u77e5\uff0c\u5efa\u7acb\u4e00\u4e2aTCP\u8fde\u63a5\u9700\u8981\u8fdb\u884c\u4e09\u6b21\u63e1\u624b\uff0c\u8fd9\u610f\u5473\u7740\u6bcf\u6b21\u8fde\u63a5\u90fd\u4f1a\u4ea7\u751f\u989d\u5916\u7684RTT\uff0c\u4ece\u800c\u7ed9\u6bcf\u4e2a\u8fde\u63a5\u589e\u52a0\u4e86\u663e\u8457\u7684\u5ef6\u8fdf\uff08\u5982\u4e0b\u56fe1\u6240\u793a\uff09\u3002<\/p>\n

\u53e6\u5916\uff0c\u5982\u679c\u8fd8\u9700\u8981TLS\u534f\u5546\u6765\u521b\u5efa\u4e00\u4e2a\u5b89\u5168\u7684\u3001\u52a0\u5bc6\u7684https\u8fde\u63a5\uff0c\u90a3\u4e48\u5c31\u9700\u8981\u66f4\u591a\u7684RTT\uff0c\u65e0\u7591\u4f1a\u4ea7\u751f\u66f4\u5927\u7684\u5ef6\u8fdf\uff08\u5982\u4e0b\u56fe\u6240\u793a\uff09\u3002<\/p>\n

\"\"<\/p>\n

\u9996\u6b21\uff0cQUIC\u534f\u8bae\u53ef\u4ee5\u57281\u4e2aRTT\u4e2d\u542f\u52a8\u4e00\u4e2a\u8fde\u63a5\u5e76\u4e14\u83b7\u53d6\u5b8c\u6210\u63e1\u624b\u6240\u9700\u7684\u5fc5\u8981\u4fe1\u606f\u3002<\/p>\n

QUIC 1 RTT<\/p>\n

\u5982\u679c\u8fde\u63a5\u7684\u662f\u4e00\u4e2a\u65b0\u7684\u670d\u52a1\u5668\uff0c\u8fd9\u65f6\u5019client\u662f\u6ca1\u6709server\u7684\u4efb\u4f55\u4fe1\u606f\u7684\uff0c\u5f53\u7136\u4e5f\u4e0d\u77e5\u9053\u7528\u90a3\u79cd\u5bc6\u94a5\u4ea4\u6362\u7b97\u6cd5\uff0c\u6ca1\u6709\u516c\u94a5\u4fe1\u606f\uff0c\u5c31\u4e0d\u53ef\u80fd\u5b9e\u73b00 RTT\u63e1\u624b\uff0c\u6240\u4ee5\uff0c\u5bf9\u4e8e\u65b0\u7684QUIC\u8fde\u63a5\u81f3\u5c11\u9700\u89811 RTT\u624d\u80fd\u5b8c\u6210\u63e1\u624b\u3002<\/p>\n

\u5728QUIC\u4e2d\uff0c\u670d\u52a1\u5668\u7684\u914d\u7f6e\u662f\u5b8c\u5168\u9759\u6001\u7684\uff0c\u800c\u4e14\u914d\u7f6e\u662f\u6709\u8fc7\u671f\u65f6\u95f4\u7684\uff0c\u7531\u4e8e\u670d\u52a1\u5668\u914d\u7f6e\u662f\u9759\u6001\u7684\uff0c\u56e0\u800c\u4e0d\u662f\u6bcf\u4e2a\u8fde\u63a5\u90fd\u9700\u8981\u91cd\u65b0\u8fdb\u884c\u7b7e\u540d\u64cd\u4f5c\uff0c\u4e00\u4e2a\u7b7e\u540d\u53ef\u4ee5\u9002\u7528\u4e8e\u591a\u4e2a\u8fde\u63a5\u3002<\/p>\n

\u53e6\u5916\uff0cQUIC\u91c7\u7528\u4e86\u4e24\u7ea7\u5bc6\u94a5\u673a\u5236\uff1a\u521d\u59cb\u5bc6\u94a5\u548c\u4f1a\u8bdd\u5bc6\u94a5\u3002QUIC\u5728\u63e1\u624b\u8fc7\u7a0b\u4e2d\u4f7f\u7528Diffie-Hellman \u7b97\u6cd5\u534f\u5546\u521d\u59cb\u5bc6\u94a5\u3002\u521d\u59cb\u5bc6\u94a5\u534f\u5546\u5b8c\u6bd5\u540e\uff0c\u670d\u52a1\u5668\u4f1a\u63d0\u4f9b\u4e00\u4e2a\u4e34\u65f6\u968f\u673a\u6570\uff0c\u4f1a\u9a6c\u4e0a\u518d\u534f\u5546\u4f1a\u8bdd\u5bc6\u94a5\uff0c\u8fd9\u6837\u53ef\u4ee5\u4fdd\u8bc1\u5bc6\u94a5\u7684\u524d\u5411\u5b89\u5168\u6027\uff0c\u4e4b\u540e\u53ef\u4ee5\u5728\u901a\u4fe1\u7684\u8fc7\u7a0b\u4e2d\u5c31\u5b9e\u73b0\u5bf9\u5bc6\u94a5\u7684\u66f4\u65b0\u3002\u63a5\u6536\u65b9\u610f\u8bc6\u5230\u6709\u65b0\u7684\u5bc6\u94a5\u8981\u66f4\u65b0\u65f6\uff0c\u4f1a\u5c1d\u8bd5\u7528\u65b0\u65e7\u4e24\u79cd\u5bc6\u94a5\u5bf9\u6570\u636e\u8fdb\u884c\u89e3\u5bc6\uff0c\u76f4\u5230\u6210\u529f\u624d\u4f1a\u6b63\u5f0f\u66f4\u65b0\u5bc6\u94a5\uff0c\u5426\u5219\u4f1a\u4e00\u76f4\u4fdd\u7559\u65e7\u5bc6\u94a5\u6709\u6548\u3002<\/p>\n

\u5177\u4f53\u63e1\u624b\u8fc7\u7a0b\u5982\u56fe\uff08\u56fe\u7247\u5f15\u7528daveywu\u7684\u6587\u7ae0\uff09\u6240\u793a\uff1a<\/p>\n

\"\"<\/p>\n

QUIC 0 RTT<\/p>\n

\u5ba2\u6237\u7aef\u5728\u7f13\u5b58\u4e86ServerConfig\u7684\u60c5\u51b5\u4e0b\uff0c\u5ba2\u6237\u7aef\u6839\u636e\u7f13\u5b58\u7684ServerConifg\u83b7\u53d6\u5230\u5bc6\u94a5\u4ea4\u6362\u7b97\u6cd5\u53ca\u516c\u94a5\uff0c\u540c\u65f6\u751f\u6210\u4e00\u4e2a\u5168\u65b0\u7684\u5bc6\u94a5\uff0c\u76f4\u63a5\u5411\u670d\u52a1\u5668\u53d1\u9001full Client hello\u6d88\u606f\uff0c\u5f00\u59cb\u6b63\u5f0f\u63e1\u624b\uff0c\u6d88\u606f\u4e2d\u5305\u62ec\u5ba2\u6237\u7aef\u9009\u62e9\u7684\u516c\u5f00\u6570\u3002\u670d\u52a1\u5668\u6536\u5230full Client hello\uff0c\u4e0d\u540c\u610f\u56de\u590dREJ\uff1b\u540c\u610f\u8fde\u63a5\uff0c\u5219\u6839\u636e\u5ba2\u6237\u7aef\u7684\u516c\u5f00\u6570\u8ba1\u7b97\u51fa\u521d\u59cb\u5bc6\u94a5\uff0c\u56de\u590dSHLO\u6d88\u606f\u3002<\/p>\n

\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u6839\u636e\u4e34\u65f6\u516c\u5f00\u6570\u548c\u521d\u59cb\u5bc6\u94a5\uff0c\u5404\u81ea\u57fa\u4e8eSHA-256\u7b97\u6cd5\u63a8\u5bfc\u51fa\u4f1a\u8bdd\u5bc6\u94a5\u3002\u53cc\u65b9\u66f4\u6362\u4f1a\u8bdd\u5bc6\u94a5\u901a\u4fe1\uff0c\u521d\u59cb\u5bc6\u94a5\u5df2\u65e0\u7528\uff0c\u81f3\u6b64\uff0cQUIC\u63e1\u624b\u8fc7\u7a0b\u7ed3\u675f\u3002<\/p>\n

2\uff09\u6539\u8fdb\u7684\u62e5\u585e\u63a7\u5236 (Improved Congestion Control)
\nQUIC\u534f\u8bae\u5f53\u524d\u9ed8\u8ba4\u4f7f\u7528TCP\u534f\u8bae\u7684Cubic\u62e5\u585e\u63a7\u5236\u7b97\u6cd5\u3002\u770b\u4f3cQUIC\u534f\u8bae\u53ea\u662f\u5427TCP\u7684\u62e5\u585e\u7b97\u6cd5\u91cd\u65b0\u5b9e\u73b0\u4e86\u4e00\u904d\uff0c\u5176\u5b9e\u4e0d\u7136\u3002QUIC\u534f\u8bae\u5728TCP\u62e5\u585e\u7b97\u6cd5\u57fa\u7840\u4e0a\u505a\u4e86\u4e9b\u6539\u8fdb\uff1a<\/p>\n

1.\u53ef\u63d2\u62d4<\/p>\n

    \n
  • \u5e94\u7528\u7a0b\u5e8f\u5c42\u9762\u5c31\u80fd\u5b9e\u73b0\u4e0d\u540c\u7684\u62e5\u585e\u63a7\u5236\u7b97\u6cd5\uff0c\u4e0d\u9700\u8981\u64cd\u4f5c\u7cfb\u7edf\u6216\u5185\u6838\u652f\u6301\u3002<\/li>\n
  • \u5355\u4e2a\u5e94\u7528\u7a0b\u5e8f\u7684\u4e0d\u540c\u8fde\u63a5\u4e5f\u80fd\u652f\u6301\u914d\u7f6e\u4e0d\u540c\u7684\u62e5\u585e\u63a7\u5236\u3002<\/li>\n
  • \u4e0d\u9700\u8981\u505c\u673a\u548c\u5347\u7ea7\u5c31\u80fd\u5b9e\u73b0\u62e5\u585e\u63a7\u5236\u7684\u53d8\u66f4\u3002<\/li>\n<\/ul>\n

    2.\u5355\u8c03\u9012\u589e\u7684Packet Number<\/p>\n

      \n
    • QUIC\u5e76\u6ca1\u6709\u4f7f\u7528TCP\u7684\u57fa\u4e8e\u5b57\u8282\u5e8f\u53f7\u53caACK\u6765\u786e\u8ba4\u6d88\u606f\u7684\u6709\u5e8f\u5230\u8fbe\uff0cQUIC\u4f7f\u7528\u7684\u662fPacket Number\uff0c\u6bcf\u4e2aPacket Number\u4e25\u683c\u9012\u589e\uff0c\u6240\u4ee5\u5982\u679cPacket N\u4e22\u5931\u4e86\uff0c\u91cd\u4f20Packet N\u7684Packet Number\u5df2\u4e0d\u662fN\uff0c\u800c\u662f\u4e00\u4e2a\u5927\u4e8eN\u7684\u503c\u3002 \u8fd9\u6837\u5c31\u5f88\u5bb9\u6613\u89e3\u51b3TCP\u7684\u91cd\u4f20\u6b67\u4e49\u95ee\u9898\u3002<\/li>\n<\/ul>\n

      3.\u66f4\u591a\u7684ACK\u5757<\/p>\n

        \n
      • QUIC ACK\u5e27\u652f\u6301256\u4e2aACK\u5757\uff0c\u76f8\u6bd4TCP\u7684SACK\u5728TCP\u9009\u9879\u4e2d\u5b9e\u73b0\uff0c\u6709\u957f\u5ea6\u9650\u5236\uff0c\u6700\u591a\u53ea\u652f\u63013\u4e2aACK\u5757<\/li>\n<\/ul>\n

        4.\u7cbe\u786e\u8ba1\u7b97RTT\u65f6\u95f4<\/p>\n

          \n
        • QUIC ACK\u5305\u540c\u65f6\u643a\u5e26\u4e86\u4ece\u6536\u5230\u5305\u5230\u56de\u590dACK\u7684\u5ef6\u65f6\uff0c\u8fd9\u6837\u7ed3\u5408\u9012\u589e\u7684\u5305\u5e8f\u53f7\uff0c\u80fd\u591f\u7cbe\u786e\u7684\u8ba1\u7b97RTT\u3002<\/li>\n<\/ul>\n

          3\uff09\u65e0\u961f\u5934\u963b\u585e\u7684\u591a\u8def\u590d\u7528 (Multiplexing without head-of-line blocking)<\/p>\n

          HTTP2\u7684\u6700\u5927\u7279\u6027\u5c31\u662f\u591a\u8def\u590d\u7528\uff0c\u800cHTTP2\u6700\u5927\u7684\u95ee\u9898\u5c31\u662f\u961f\u5934\u963b\u585e\u3002<\/p>\n

          \u9996\u5148\u4e86\u89e3\u4e0b\u4e3a\u4ec0\u4e48\u4f1a\u51fa\u73b0\u961f\u5934\u963b\u585e\u3002\u6bd4\u5982HTTP2\u5728\u4e00\u4e2aTCP\u8fde\u63a5\u4e0a\u540c\u65f6\u53d1\u90013\u4e2astream\uff0c\u5176\u4e2d\u7b2c2\u4e2astream\u4e22\u4e86\u4e00\u4e2aPacket\uff0cTCP\u4e3a\u4e86\u4fdd\u8bc1\u6570\u636e\u53ef\u9760\u6027\uff0c\u9700\u8981\u53d1\u9001\u7aef\u91cd\u4f20\u4e22\u5931\u7684\u6570\u636e\u5305\uff0c\u867d\u7136\u8fd9\u65f6\u5019\u7b2c3\u4e2a\u6570\u636e\u5305\u5df2\u7ecf\u5230\u8fbe\u63a5\u6536\u7aef\uff0c\u4f46\u88ab\u963b\u585e\u4e86\u3002\u8fd9\u5c31\u662f\u6240\u8c13\u7684\u961f\u5934\u963b\u585e\u3002<\/p>\n

          \u800cQUIC\u591a\u8def\u590d\u7528\u53ef\u4ee5\u907f\u514d\u8fd9\u4e2a\u95ee\u9898\uff0c\u56e0\u4e3aQUIC\u7684\u4e22\u5305\u3001\u6d41\u63a7\u90fd\u662f\u57fa\u4e8estream\u7684\uff0c\u6240\u6709stream\u662f\u76f8\u4e92\u72ec\u7acb\u7684\uff0c\u4e00\u6761stream\u4e0a\u7684\u4e22\u5305\uff0c\u4e0d\u4f1a\u5f71\u54cd\u5176\u4ed6stream\u7684\u6570\u636e\u4f20\u8f93\u3002<\/p>\n

          4\uff09\u524d\u5411\u7ea0\u9519 (Forward Error Correction)<\/p>\n

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          <\/div>\n<\/div>\n<\/div>\n<\/article>\n","protected":false},"excerpt":{"rendered":"

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