- \n
- check web_get<\/li>\n<\/ol>\n\n\n\n
\u73af\u5883\u642d\u5efa<\/h3>\n\n\n\n
prepare\uff1a<\/p>\n\n\n\n
\u5982\u4f55\u68c0\u67e5\u73af\u5883\u8bbe\u7f6e\u662f\u5426\u5230\u4f4d\u5462\uff1f<\/p>\n\n\n\n
\u6211\u4eec\u53ef\u4ee5\u5c1d\u8bd5\u7528telnet\u547d\u4ee4<\/p>\n\n\n\n
\n
telnet cs144.keithw.org http<\/p>\n<\/blockquote>\n\n\n\n
\u89c2\u5bdf\u5230\u5982\u4e0b\u6253\u5370\uff1a<\/p>\n\n\n\n
![\"\"](\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\")
<\/div><\/figure>\n\n\n\n\u800c\u540e\u8f93\u5165<\/p>\n\n\n\n
\n
GET \/hello HTTP\/1.1<\/p>\n\n\n\n
Host: cs144.keithw.org<\/p>\n\n\n\n
Connection: close<\/p>\n<\/blockquote>\n\n\n\n
\u952e\u5165\u7a7a\u683c\uff0c\u544a\u8bc9\u670d\u52a1\u7aefhttp\u8bf7\u6c42\u7ed3\u675f, \u56de\u663e\u5982\u4e0b<\/p>\n\n\n\n
<\/div><\/figure>\n\n\n\n\u6839\u636e\u6559\u7a0b\u914d\u7f6e\u597d\u73af\u5883\u540e\uff0c\u5c06github \u4ed3\u5e93\u5173\u8054\u5230\u672c\u5730\u4e0a\uff0c\u4ee5\u540e\u63d0\u4ea4\u4ee3\u7801\u7528git push github<\/p>\n\n\n\n
\u6982\u8ff0<\/h3>\n\n\n\n
lab0\u662f\u4e00\u4e2a\u70ed\u8eab\uff0c\u8bfb\u4e00\u4e0b\u6846\u67b6\u7684\u4ee3\u7801\uff0c\u6784\u9020\u4e00\u4e2arequest\u5373\u53ef\uff0c\u800c\u540e\u5c06response\u56de\u663e\uff0c\u6d4b\u8bd5\uff1a<\/p>\n\n\n\n
<\/div><\/figure>\n\n\n\nseems ok<\/p>\n\n\n\n
\u81ea\u52a8\u6d4b\u8bd5\u4e00\u4e0b\uff1a<\/p>\n\n\n\n
<\/div><\/figure>\n\n\n\n\u901a\u8fc7<\/p>\n\n\n\n
\u4ee3\u7801\u98ce\u683c\u68c0\u67e5<\/h3>\n\n\n\n
\u6ce8\u610f\uff01<\/p>\n\n\n\n
\u4ea4\u4f5c\u4e1a\u524d\uff0c\u7528<\/p>\n\n\n\n
cmake --build build --target tidy<\/code><\/pre>\n\n\n\n\u6765\u68c0\u67e5\u4ee3\u7801\u98ce\u683c<\/p>\n\n\n\n
cmake --build build --target format<\/code><\/pre>\n\n\n\n\u683c\u5f0f\u5316\u4ee3\u7801<\/p>\n\n\n\n
- \n
- An in-memory reliable byte stream<\/li>\n<\/ol>\n\n\n\n
\u6982\u8ff0<\/h3>\n\n\n\n
\u5b9e\u73b0\u4e00\u4e2a\u5b57\u8282\u6d41\uff0c\u4e0d\u7528\u8003\u8651\u7ebf\u7a0b\u5b89\u5168<\/p>\n\n\n\n
\n
Your byte stream is for use in a single thread\u2014you don\u2019t have to worry about concurrent writers\/readers, locking, or race conditions.<\/p>\n<\/blockquote>\n\n\n\n
\u65e2\u7136\u53ea\u662f\u5355\u7ebf\u7a0b\u7684\u8bdd\uff0c\u662f\u6bd4\u8f83\u597d\u5904\u7406\u7684\uff0c\u4e00\u5f00\u59cb\u6ca1\u6709\u660e\u767d\u6bcf\u4e2a\u51fd\u6570\u8981\u505a\u4ec0\u4e48\uff0c\u540e\u9762\u770b\u4e86\u4e0b\u6d4b\u8bd5\u7528\u4f8b\u624d\u641e\u6e05\u695a\u3002<\/p>\n\n\n\n
\u8fd9\u91cc\u9009\u62e9\u4e0b\u6570\u636e\u7ed3\u6784\u3002\u9996\u5148\u5c1d\u8bd5\u7528deque\u53bb\u505a\u7f13\u5b58\uff0c\u4f46\u662f\u6027\u80fd\u6bd4\u8f83\u5dee\uff0c\u6700\u540e\u4f7f\u7528\u7684\u662f
std::queue<string><\/code> \u6765\u505a\u7f13\u5b58\u7ed3\u6784\u3002<\/p>\n\n\n\n\u5982\u679c\u662f\u591a\u7ebf\u7a0b\u7684\u8bdd\uff0c\u90a3\u8981\u8003\u8651\u4ec0\u4e48\u5462\uff1f<\/p>\n\n\n\n
- \n
- condition race — \u5b58\u5728race\u7684\u6570\u636e\u90fd\u9700\u8981\u7528\u539f\u5b50\u53d8\u91cf\u58f0\u660e\u53ca\u64cd\u4f5c<\/li>\n\n\n\n
- \u53ef\u91cd\u5165\u6027<\/li>\n\n\n\n
- buffer \u8003\u8651\u5230\u6027\u80fd\u5e94\u505a\u6210\u65e0\u9501\u961f\u5217<\/li>\n\n\n\n
- …<\/li>\n<\/ul>\n\n\n\n
\u6d4b\u8bd5<\/h3>\n\n\n\n
<\/div><\/figure>\n\n\n\ncommit\u524d\u8bb0\u5f97\u89c4\u8303\u4e0b\u683c\u5f0f<\/p>\n\n\n\n
cmake --build build --target tidy\ncmake --build build --target format<\/code><\/pre>\n\n\n\n\u63d0\u4ea4\u5b8c\u6210<\/p>\n\n\n\n
lab0 warm up \u7ed3\u675f<\/p>\n\n\n\n
Lab 1 Stitching substrings into a byte stream<\/h1>\n\n\n\n
\u6982\u8ff0<\/h2>\n\n\n\n
<\/div><\/figure>\n\n\n\n\u4e0a\u56fe\u4e3a\u5b98\u65b9\u63d0\u4f9b\u7684tcp\u6a21\u5757\u5316\u5b9e\u73b0\u67b6\u6784\u56fe\uff0c\u6211\u4eec\u5c06\u5206\u6a21\u5757\u9010\u6b65\u5b9e\u73b0tcp\u6a21\u5757\u3002\u5728lab1 \u4e2d\u6211\u4eec\u8981\u5b9e\u73b0TCPReceiver \u4e2d\u7684 Reassembler\u7c7b\uff0c\u5176\u4f5c\u7528\u662f\u5c06\u6536\u5230\u7684\u5b57\u8282segment\u91cd\u7ec4\u6210\u6709\u5e8f\u7684\u5b57\u8282\u6d41\u4f20\u9012\u7ed9\u6211\u4eec\u5728lab0 \u4e2d\u5b9e\u73b0\u7684BtyeStream\u3002<\/p>\n\n\n\n
<\/div><\/figure>\n\n\n\n- \n
- \u84dd\u8272\u90e8\u5206\uff1a\u5df2\u7ecf\u51fabuffer<\/li>\n\n\n\n
- \u7eff\u8272\u90e8\u5206\uff1a\u7ecf\u8fc7reassembler\u7684\u6392\u5e8f\uff0c\u5df2\u7ecf\u653e\u5165buffer<\/li>\n\n\n\n
- \u7ea2\u8272\u90e8\u5206\uff1areassembler\u50a8\u5b58\u4e14\u9700\u8981\u6392\u5e8f\u7684\u90e8\u5206<\/li>\n\n\n\n
- other\uff1a\u4e22\u5f03<\/li>\n<\/ul>\n\n\n\n
\u9075\u5faa\u7684\u539f\u5219<\/h2>\n\n\n\n
- \n
- \u5f53\u91cd\u6392\u5668\u610f\u8bc6\u5230\u80fd\u5199\u5165buffer\u65f6\uff0c\u9a6c\u4e0a\u5199\u5165\u3002<\/li>\n<\/ol>\n\n\n\n
\u4f55\u65f6\u80fd\u5199\u5165\uff1f\u91cd\u6392\u5668\u7f13\u5b58\u975e\u7a7a\uff0c\u4eceexpect_index \u5230 \u53ef\u5199\u5165\u7684index\u4e4b\u524d\u7684\u6240\u6709\u6570\u636e\u90fd\u6709\u5e8f\u586b\u5145\u540e\uff0c\u53ef\u5199\u5165\u3002<\/p>\n\n\n\n
- \n
- \u8bf7\u8bb0\u4f4f\uff0c\u91cd\u6392\u5668\u662f\u6709\u5bb9\u91cf\u4e0a\u7ebf\u7684\uff0c\u4ee5\u53ca\uff0c\u518d\u5224\u65ad\u662f\u5426\u53ef\u5199\u5165\u7684\u65f6\u5019\uff0cbuffer\u53ef\u5904\u7406\u7684\u90e8\u5206\u4e5f\u662f\u6709\u5bb9\u91cf\u4e0a\u7ebf\u7684(availble_size)\u3002<\/li>\n\n\n\n
- \u5bf9\u4e8e\u8981\u5904\u7406\u7684\u5b50\u4e32\uff0c\u5982\u679cbuffer\u4e2d\u5df2\u7ecf\u6709\u5b50\u4e32\u7684\u524d\u7f00\uff0c\u5219\u5c06\u8fd9\u90e8\u5206\u524d\u7f00\u622a\u65ad\u3002<\/li>\n\n\n\n
- eof\u5224\u65ad\uff0c\u9996\u5148\u662f\u8fd9\u4e2a\u5b50\u4e32\u8981\u662feof\u4e32\uff0c\u7136\u540e\u5f53\u524d\u7684\u5bb9\u91cf\uff08\u91cd\u6392\u5668\u5bb9\u91cf\/buffer\u5bb9\u91cf\uff09\u80fd\u591f\u5904\u7406\u5b50\u4e32\u7684\u6240\u6709\u90e8\u5206\uff0c\u624d\u80fd\u8ba4\u5b9a\u4e3aeof\u3002<\/li>\n<\/ol>\n\n\n\n
\u601d\u8def\u8ba8\u8bba<\/h2>\n\n\n\n
\u601d\u8003\u4e00\u4e0b\uff0c\u6211\u4eec\u4f1a\u9762\u5bf9\u54ea\u4e9b\u60c5\u51b5\uff1f<\/p>\n\n\n\n
\u6211\u4eec\u73b0\u5728\u5df2\u77e5\u7684\u662f\uff1a<\/p>\n\n\n\n
- \n
- expect_index_\uff1a \u91cd\u6392\u5668\u671f\u671b\u7684index,index\u4e4b\u524d\u5df2\u7ecf\u5199\u5165stream<\/li>\n\n\n\n
- index\uff1a\u4f20\u5165\u7684\u5b57\u8282\u6d41\u7684\u9996\u4e2aindex<\/li>\n\n\n\n
- data_size: \u4f20\u5165\u7684\u5b57\u8282\u6d41\u957f\u5ea6\uff0c\u5355\u4f4d byte<\/li>\n<\/ul>\n\n\n\n
- \n
- expect_index > index + data_size<\/li>\n<\/ol>\n\n\n\n
- \n
- \u76f4\u63a5drop\uff0c\u56e0\u4e3a\u6240\u6709\u7684\u6570\u636e\u90fd\u5df2\u7ecf\u5199\u5165<\/li>\n<\/ul>\n\n\n\n<\/div><\/figure>\n\n\n\n
- \n
- index < expect_index < index + datasize<\/li>\n<\/ol>\n\n\n\n
- \n
- \u5c06\u91cd\u5408\u7684\u90e8\u5206\u622a\u65ad<\/li>\n\n\n\n
- \u5904\u7406\u622a\u65ad\u540e\u7684\u6570\u636e<\/li>\n<\/ul>\n\n\n\n<\/div><\/figure>\n\n\n\n
\u6d4b\u8bd5<\/h2>\n\n\n\n
\n
cmake –build build –target check1<\/p>\n<\/blockquote>\n\n\n\n
<\/div><\/figure>\n\n\n\nok\uff0clab1\u5b8c\u6210~<\/p>\n\n\n\n
\u6211\u662f\u76f4\u63a5\u4f7f\u7528wsl\u4f5c\u4e3a\u5b9e\u9a8c\u73af\u5883\u7684\uff0c\u6240\u4ee5\u91cd\u6392\u5668\u7684\u6027\u80fd\u770b\u4e0a\u53bb\u8fd8\u53ef\u4ee5\uff0c\u4e0e\u6700\u4f18\u5b9e\u8df5\u80af\u5b9a\u6709\u4e9b\u5dee\u8ddd\uff0c\u82e5\u65e5\u540e\u6709\u95f2\u6687\u518d\u6765\u4f18\u5316\u3002<\/p>\n\n\n\n
lab2 the TCP receiver<\/h1>\n\n\n\n
\u6982\u8ff0<\/h2>\n\n\n\n
\u5b9e\u73b0\u4e86\u91cd\u6392\u5668\u4e4b\u540e\uff0c\u6211\u4eec\u73b0\u5728\u8981\u5b9e\u73b0 tcp \u63a5\u6536\u7aef\u4e86~<\/p>\n\n\n\n
\u63a5\u6536\u7aef\u4ece\u53d1\u9001\u7aef\u6536\u5230\u6d88\u606f\u540e\uff0c\u5c06\u5176\u4ea4\u7ed9\u91cd\u6392\u5668\uff0c\u91cd\u6392\u5668\u4f1a\u5c06\u6570\u636e\u5199\u5165buffer\u3002\u540c\u65f6\uff0cReceiver\u8fd8\u9700\u8981\u901a\u8fc7send()\u63a5\u53e3\u5411\u53d1\u9001\u7aef\u53d1\u786e\u8ba4\u5e27\u3002<\/p>\n\n\n\n
\u63a5\u6536\u7aef\u9700\u8981\u544a\u8bc9\u53d1\u9001\u7aef<\/p>\n\n\n\n
- \n
- \u672a\u88ab\u91cd\u6392\u7684\u7b2c\u4e00\u4e2asegment\u7684\u7d22\u5f15\uff0c\u4e5f\u5373\u4e3a\u6240\u8c13\u7684
ack number<\/code> orackno<\/code>. \u8fd9\u662f\u63a5\u6536\u7aef\u671f\u671b\u4ece\u53d1\u9001\u7aef\u6536\u5230\u7684\u7b2c\u4e00\u4e2asegment<\/strong>\u3002<\/li>\n\n\n\n- ByteStream\u4e2d\u7684\u6709\u6548\u7a7a\u95f4\uff0c\u5373\u4e3a\u6240\u8c13\u6ed1\u52a8\u7a97\u53e3<\/strong>\u7684
window size<\/code>.<\/li>\n<\/ul>\n\n\n\nackno<\/code> \u548cwindow size<\/code> \u5171\u540c\u63cf\u8ff0\u4e86\u63a5\u6536\u65b9\u6ed1\u52a8\u7a97\u53e3\u7684\u60c5\u51b5\uff0c\u540c\u65f6\u53d1\u9001\u65b9\u53ef\u4ee5\u4ece\u8fd9\u4e24\u8005\u5f97\u51fa\uff1a\u53d1\u9001\u65b9\u5141\u8bb8\u53d1\u9001\u7684\u7d22\u5f15\u8303\u56f4<\/strong>\u3002\u4f7f\u7528\u8fd9\u79cd\u673a\u5236\uff0c\u63a5\u6536\u65b9\u5c31\u80fd\u8fdb\u884c\u6d41\u91cf\u63a7\u5236\u3002\u6211\u4eec\u53ef\u4ee5\u79f0ackno<\/code> \u4e3a\u63a5\u6536\u7aef\u671f\u671b\u7684\u5de6\u8fb9\u754c\uff0cackno + window size<\/code>\u4e3a\u63a5\u6536\u7aef\u671f\u671b\u7684\u53f3\u8fb9\u754c\u3002<\/p>\n\n\n\n\u5230\u76ee\u524d\u4e3a\u6b62\uff0c\u6211\u4eec\u5df2\u7ecf\u5b8c\u6210\u4e86\u91cd\u6392\u5668\u548c\u5b57\u8282\u6d41\u7684\u6784\u5efa\uff0c\u63a5\u4e0b\u6765\u63a5\u6536\u7aef\u7684\u5b9e\u73b0\u66f4\u591a\u7684\u662f\u5de5\u7a0b\u95ee\u9898\u800c\u975e\u7b97\u6cd5\u95ee\u9898\u4e86\u3002\u91cd\u70b9\u5728\u4e8e\uff0c\u5982\u4f55\u5728\u6d41\u4e2d\u8868\u793a\u6570\u636e\u7684\u4f4d\u7f6e\u3002<\/p>\n\n\n\n
2.1 Translating between 64-bit indexes and 32-bit seqnos<\/h2>\n\n\n\n
\u601d\u8def\u8ba8\u8bba<\/h3>\n\n\n\n
\u6839\u636e\u624b\u518c\u4e2d\u63cf\u8ff0\u7684\uff0c\u5176\u4e2d\u7684\u4e00\u4e2a\u96be\u70b9\u5728\u4e8e\u3002tcp\u534f\u8bae\u9884\u7559\u7ed9seqno\u7684\u7a7a\u95f4\u53ea\u670932bit\u5927\u5c0f\uff0c\u56e0\u4e3aTCP\u534f\u8bae\u4e0d\u53ef\u80fd\u7ed9\u51fa64\u4f4d\u7528\u6765\u5b58\u653e\u5e8f\u5217\u53f7\uff0c\u8fd9\u592a\u5360\u7528\u7a7a\u95f4\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7
RFC 793<\/code> \u6765\u786e\u8ba4tcp\u534f\u8bae\u7684\u5b57\u6bb5<\/p>\n\n\n\n<\/div><\/figure>\n\n\n\n\u90a3\u4e48\u4e00\u5171\u6709\u4e09\u4e2a\u8981\u6ce8\u610f\u7684\u70b9<\/p>\n\n\n\n
- \n
- \u4f60\u7684\u5b9e\u73b0\u9700\u8981\u8003\u865132\u4f4d\u6574\u6570\u7684\u6ea2\u51fa\u60c5\u51b5\u3002<\/li>\n<\/ol>\n\n\n\n
\u6bd5\u7adf32\u4f4d\u6574\u6570\u7684\u6700\u5927\u8303\u56f4\u662f4GB\uff0c\u82e5\u8d85\u8fc74GB\uff0cindex\u4f1a\u4ece0\u5f00\u59cb\u3002\u800c4GB\u7684\u6d41\u662f\u6709\u53ef\u80fd\u51fa\u73b0\u7684\u3002<\/p>\n\n\n\n
- \n
- TCP
seqno<\/code> \u5f00\u59cb\u4e8e\u4e00\u4e2a\u968f\u673a\u503c\u3002<\/li>\n<\/ol>\n\n\n\n\u8003\u8651\u5230\u9c81\u68d2\u6027\u4ee5\u53ca\u51cf\u5c11\u90e8\u5206\u573a\u666f\u53ef\u80fd\u5b58\u5728\u7684\u8ff7\u60d1\u3002TCP\u7684\u5f00\u59cbseqno(<\/strong>ISN<\/strong>, <\/strong>Initial Sequence Number<\/strong>)<\/strong>\u662f\u4e00\u4e2a\u968f\u673a\u768432-bit number\u3002<\/p>\n\n\n\n
- \n
- SYN\u5305\u548cFIN\u5305\u4e5f\u9700\u8981\u5360\u7528
seqno<\/code>\u54e6<\/li>\n<\/ol>\n\n\n\n<\/div><\/figure>\n\n\n\n\u8fd9\u91cc\u6709\u4e00\u4e9b\u522b\u79f0\uff0c\u65b9\u4fbf\u6211\u4eec\u5398\u6e05\u6982\u5ff5\uff1a<\/p>\n\n\n\n
- \n
seqno<\/code>\uff1aTCP\u5934\u90e8\u586b\u5165\u7684seqno\uff0c\u6ce8\u610fTCP\u6709\u4e24\u4e2a\u65b9\u5411\uff0c\u6bcf\u4e2a\u65b9\u5411\u90fd\u6709\u81ea\u5df1\u7684ISN\u548cseqno\u3002\u5faa\u73af\u8ba1\u6570\u3002<\/li>\n\n\n\nabsolute sequence number<\/code>\uff1a\u4ece0\u5f00\u59cb\uff0c\u4e0d\u4f1a\u6ea2\u51fa(64 bit)\u3002\u975e\u5faa\u73af\u8ba1\u6570\u3002<\/li>\n\n\n\nstream index<\/code>\uff1a\u91cd\u6392\u5668\u4e2d\u4f20\u5165\u7684\u7d22\u5f15\uff0c\u4ece0\u5f00\u59cb\u3002\u975e\u5faa\u73af\u8ba1\u6570\u3002<\/li>\n<\/ul>\n\n\n\n\u901a\u8fc7\u4e0a\u56fe\uff0c\u6211\u4eec\u5f88\u5bb9\u6613\u5c31\u80fd\u68b3\u7406\u51fa\u4e0b\u5217\u5173\u7cfb\uff1a<\/p>\n\n\n\n
\n
seqno = abs seqno + ISN<\/p>\n<\/blockquote>\n\n\n\n
\u90a3\u4e48\u4e24\u79cd\u8f6c\u5316\u65b9\u5f0f\u8003\u8651\u5982\u4e0b\uff1a<\/p>\n\n\n\n
- \n
- 64bit -> 32 bit: \u5982\u4e0a\u5f0f<\/li>\n\n\n\n
- 32bit -> 64bit: \u8fd9\u91cc\u52a0\u4e00\u4e2a\u5165\u53c2
checkpoint<\/code> \u7684\u6982\u5ff5\n- \n
- checkpoint\uff1a\u6700\u8fd1\u4e00\u6b21convert\u5f97\u5230\u7684
abs seqno<\/code>, \u672c\u6b21convert\u5f97\u5230\u7684\u6570\u5e94\u8be5\u5c3d\u91cf\u7684\u4e0e\u4ed6\u63a5\u8fd1(\u6211\u4eec\u8ba4\u4e3a\u76f8\u90bb\u4e24\u4e2aseqno\u7684\u5dee\u503c\u4e0d\u4f1a\u8d85\u8fc7int32Max)\u3002<\/li>\n\n\n\n- \u6545\u800c\u5f97\u5230abs seqno\uff0c\u800c\u540e\u4e0echeckpoint\u505a\u6bd4\u8f83\uff0c\u79bb\u5f97\u6700\u8fd1\u7684\u4e3a\u51c6\u3002<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n\n\n\n
\u6d4b\u8bd5<\/h3>\n\n\n\n
<\/div><\/figure>\n\n\n\n\u901a\u8fc7\u6d4b\u8bd5~<\/p>\n\n\n\n
2.2 Implementing the TCP receiver<\/h2>\n\n\n\n
\u5b9e\u73b0\u57fa\u4e8e\u6ed1\u52a8\u7a97\u53e3\u7684tcp\u63a5\u6536\u7aef\u3002<\/p>\n\n\n\n
\u89e3\u8bfb\u4e00\u4e0bTCPReceiver\u8fd9\u4e2a\u7c7b\uff0c\u5b83\u4ee5\u91cd\u6392\u5668\u4e3a\u53c2\u6570\u4f5c\u4e3a\u6784\u9020\u51fd\u6570\u3002\u6211\u4eec\u4e0d\u4ec5\u8981\u63a5\u6536\u7531\u5bf9\u7aef\u53d1\u6765\u7684\u6570\u636e\uff0c\u5f53\u7136\u8fd8\u8981\u56de\u590d\u6d88\u606f\u7ed9\u5bf9\u65b9\uff0c\u6bd4\u5982
ack<\/code> \u548crst<\/code> \u6d88\u606f\u3002<\/p>\n\n\n\n\u601d\u8def\u8ba8\u8bba<\/h3>\n\n\n\n
\u6211\u4eec\u4e00\u5171\u8981\u5b9e\u73b0\u4e24\u4e2a\u63a5\u53e3\uff1a
Receive<\/code> \u548cSend<\/code>\u3002\u7528\u8fd9\u4e24\u4e2a\u63a5\u53e3\u6765\u5b9e\u73b0\u4e00\u4e2a\u5177\u6709\u6d41\u91cf\u63a7\u5236\u548c\u5f02\u5e38\u63a7\u5236\u7684\u6ed1\u52a8\u7a97\u53e3\u673a\u5236\u3002<\/p>\n\n\n\n\u5728
Receive<\/code>\u4e2d\uff0c\u6ce8\u610f\u8981\u5bf9\u7279\u6b8a\u6807\u5fd7\u6709\u7279\u6b8a\u5904\u7406\uff0c\u5982fin, ack, rst<\/code>\u3002<\/p>\n\n\n\n\u5728
Send<\/code>\u4e2d\uff0c\u5b9e\u9645\u4e0a\u5c31\u662f\u56de\u590d\uff0c\u6211\u8ba4\u4e3a\u4e3b\u8981\u7528\u6765\u53d1\u9001ack<\/code>,rst<\/code>\u548c\u4e00\u4e9b\u5efa\u8bae\u7684\u6d88\u606f\u3002<\/p>\n\n\n\n\u8981\u6ce8\u610f\u5e8f\u5217\u53f7\u7684\u8f6c\u5316\uff0c\u4ee5\u53ca\u6211\u4eec\u4f20\u9012\u7ed9
Reassembler<\/code>\u7684\u5e8f\u5217\u53f7\u8981\u662fabs seqno<\/code>\u3002<\/p>\n\n\n\n\u6d4b\u8bd5<\/h3>\n\n\n\n
\u8c03\u8bd5\u8c03\u4e86\u5f97\u6709\u5feb\u4fe9\u5c0f\u65f6\u3002<\/p>\n\n\n\n
\n
cmake –build build –target check2<\/p>\n<\/blockquote>\n\n\n\n
<\/div><\/figure>\n\n\n\n\u901a\u8fc7~<\/p>\n\n\n\n
lab3 the TCP sender<\/h1>\n\n\n\n
\u4e3b\u8981\u5b9e\u73b0\u8d85\u65f6\u91cd\u4f20\u548c\u62e5\u585e\u63a7\u5236<\/p>\n\n\n\n
\u6982\u8ff0<\/h3>\n\n\n\n
\u5148\u8be6\u7ec6\u8bfb\u4e00\u8bfb\u5b9e\u9a8c\u6307\u5357\u5427<\/h4>\n\n\n\n
TCP\u662f\u4e0d\u7a33\u5b9a\u7684\u7f51\u7edc\u73af\u5883\u4e2d\u7684\u53ef\u9760\u4f20\u8f93\u534f\u8bae\u3002\u901a\u4fe1\u7684\u53cc\u65b9(peer)\u5373\u4f7f\u53d1\u9001\u8005\uff0c\u4e5f\u662f\u63a5\u6536\u8005\u3002<\/p>\n\n\n\n
TCP\u53d1\u9001\u7aef\u7684\u804c\u8d23\uff1a<\/p>\n\n\n\n
- \n
- \u8ddf\u8e2a\u63a5\u6536\u7aef\u7684\u7a97\u53e3\u72b6\u6001\uff08\u901a\u8fc7
window size<\/code> \u548cackno<\/code>\uff09<\/li>\n\n\n\n- \u901a\u8fc7\u8bfb
ByteStream<\/code>\u7684\u72b6\u6001\u5728\u53ef\u4ee5\u88c5\u586b\u65f6\u88c5\u586bwindow\uff0c\u521b\u5efa\u5e76\u53d1\u9001TCP segment<\/code>\uff0c\u5e76\u4e14\u5728\u9700\u8981\u65f6\u5e26\u4e0aSYN\u548cFIN flag\u3002<\/li>\n\n\n\n- \u8ddf\u8e2a
outstanding segments<\/code>,\u5373\u4e3a\u53d1\u9001\u4e86\u4f46\u662f\u8fd8\u672a\u88ab\u63a5\u6536\u7aefack\u3002<\/li>\n\n\n\n- \u8d85\u65f6\u540e\u91cd\u4f20
outstanding segments<\/code>.<\/li>\n<\/ul>\n\n\n\n\u4e3a\u4ec0\u4e48\u6211\u4eec\u8981\u5173\u6ce8\u4ee5\u4e0a\u8fd9\u4e9b\u5462\uff1f<\/p>\n\n\n\n
- \n
- \u91cd\u4f20\uff1a\u57fa\u672c\u539f\u5219\u662f\uff0c\u82e5\u63a5\u6536\u7aef\u5141\u8bb8\u6211\u4eec\u53d1\u9001\uff0c\u6211\u4eec\u5c31\u53d1\u9001\u3002\u4e14\u6211\u4eec\u5e94\u6301\u7eed\u91cd\u4f20
outstanding segments<\/code>.\u8fd9\u88ab\u79f0\u4e3aARQ(Atumic Repeat Request)<\/strong>\u3002<\/li>\n\n\n\n- \u611f\u8c22\u6211\u4eec\u4e4b\u524d\u7684\u5de5\u4f5c\uff0c\u6211\u4eec\u77e5\u9053\u4e86\u63a5\u6536\u7aef\u53ea\u8981\u6536\u5230\u6bcf\u4e2a
index tagged byte<\/code>\u81f3\u5c11\u4e00\u6b21\uff0c\u800c\u65e0\u5173\u6536\u5230\u7684\u987a\u5e8f\uff0c\u5b83\u5c31\u80fd\u91cd\u65b0\u7ec4\u5efabyte stream<\/code>, \u6240\u4ee5\u6211\u4eec\u53d1\u9001\u7aef\u5c31\u9700\u8981\u786e\u8ba4\u63a5\u6536\u7aef\u81f3\u5c11\u8981\u6536\u5230\u6bcf\u5355\u4f4d\u4e00\u6b21<\/strong>\u3002<\/li>\n<\/ul>\n\n\n\nTCP Sender\u600e\u4e48\u77e5\u9053segment\u4e22\u5931\u4e86\uff1f<\/h4>\n\n\n\n
\u6211\u4eec\u6709\u4e00\u4e2a
tick<\/code>\u65b9\u6cd5, \u8868\u793a\u8d85\u65f6\u7684\u65f6\u95f4\u3002\u5982\u679c\u6211\u4eec\u6700\u65e9\u53d1\u9001\u7684segment\u5728\u8fbe\u5230\u8d85\u65f6\u65f6\u95f4\u540e\u8fd8\u662f\u6ca1\u6709\u5f97\u5230ack\uff0c\u90a3\u4e48\u6211\u4eec\u5c31\u9700\u8981\u91cd\u4f20\u4e86\u3002<\/p>\n\n\n\n- \n
- \u6bcf\u8fc7\u53bb\u51e0\u4e2ams\uff0c
tick<\/code>\u65b9\u6cd5\u5c31\u4f1a\u88ab\u8c03\u7528\u6765\u544a\u8bc9\u4f60\u8fc7\u53bb\u4e86\u591a\u4e45\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5b83\u6765\u8bb0\u5f55TCP Sender<\/code>\u5b58\u6d3b\u7684\u65f6\u95f4\u3002\u7531\u4e8e\u5df2\u7ecf\u63d0\u4f9b\u4e86tick<\/code>\u65b9\u6cd5\uff0c\u5927\u4f19\u513f\u5c31\u4e0d\u8981\u518d\u4ece\u5176\u4ed6\u9014\u5f84\u6765\u83b7\u53d6\u65f6\u95f4\u4e86\u3002<\/li>\n\n\n\nTCP Sender<\/code>\u88ab\u6784\u5efa\u7684\u65f6\u5019\uff0c\u662f\u6709\u4e2a\u53c2\u6570\u80fd\u591f\u4f20\u5165RTO<\/code>(retransmission timeout)\u7684. \u5f53\u7136\uff0cRTO<\/code>\u662f\u4f1a\u968f\u7740\u65f6\u95f4\u8c03\u6574\u7684\uff0c\u4f46\u662f\u521d\u59cb\u503c\u4e0d\u4f1a\u53d8\u5316\u3002initial_RTO_ms \u662f\u8be5\u521d\u59cb\u503c\u3002<\/li>\n\n\n\n- \u6211\u4eec\u8fd8\u9700\u8981\u5b9e\u73b0\u91cd\u4f20\u7684\u5b9a\u65f6\u5668
timer<\/code>,\u4e00\u4e2a\u53ef\u4ee5\u5728\u7279\u5b9a\u65f6\u95f4\u6216\u8005RTO<\/code>\u8fc7\u671f\u7684\u65f6\u5019\u53d1\u51fa\u544a\u8b66\u7684\u5b9a\u65f6\u5668\u3002\u6211\u4eec\u9700\u8981\u57fa\u4e8etick<\/code>\u6765\u5b9e\u73b0\u76f8\u5173\u903b\u8f91\u3002<\/li>\n\n\n\n- \u6211\u4eec\u9700\u8981\u5728\u53d1\u9001\u5e26\u6709\u6570\u636e\u7684segment\u65f6\u542f\u52a8
timer<\/code>\uff0c\u8fd9\u6837\u5728RTO<\/code>\u4e4b\u540e\u5b83\u5c31\u80fd\u8fc7\u671f\u3002<\/li>\n\n\n\n- \u5f53\u6240\u6709\u53d1\u9001\u7684segment\u90fd\u88aback\u540e\uff0c\u505c\u6b62RTO timer.<\/li>\n\n\n\n
- \u5982\u679c\u8c03\u7528\u4e86 tick \u51fd\u6570\u4e14\u91cd\u4f20\u5b9a\u65f6\u5668\u5df2\u8d85\u65f6\uff1a\n
- \n
- \u91cd\u4f20 TCP \u63a5\u6536\u65b9\u5c1a\u672a\u5b8c\u5168\u786e\u8ba4\u7684\u6700\u65e9\uff08\u5e8f\u5217\u53f7\u6700\u5c0f\uff09\u7684\u6bb5\u3002\u6211\u4eec\u9700\u8981\u5728\u67d0\u4e9b\u5185\u90e8\u6570\u636e\u7ed3\u6784\u4e2d\u5b58\u50a8\u672a\u786e\u8ba4\u7684\u6bb5\uff0c\u4ee5\u4fbf\u80fd\u591f\u505a\u5230\u8fd9\u4e00\u70b9\u3002<\/li>\n\n\n\n
- \u5982\u679c\u7a97\u53e3\u5927\u5c0f\u4e0d\u4e3a\u96f6\uff1a\n
- \n
- \u8bb0\u5f55\u8fde\u7eed\u91cd\u4f20\u7684\u6b21\u6570\uff0c\u5e76\u5c06\u5176\u9012\u589e\uff0c\u56e0\u4e3a\u6211\u4eec\u521a\u521a\u91cd\u4f20\u4e86\u67d0\u4e9b\u5185\u5bb9\u3002\u6211\u4eec\u7684
TCP Connection<\/code> \u5c06\u4f7f\u7528\u6b64\u4fe1\u606f\u6765\u5224\u65ad\u8fde\u63a5\u662f\u5426\u65e0\u671b\uff08\u8fde\u7eed\u91cd\u4f20\u6b21\u6570\u8fc7\u591a\uff09\u5e76\u9700\u8981\u7ec8\u6b62\u3002<\/li>\n\n\n\n- \u5c06 RTO \u7684\u503c\u52a0\u500d\u3002\u8fd9\u88ab\u79f0\u4e3a\u201c\u6307\u6570\u9000\u907f\u201d\u2014\u2014\u5b83\u4f1a\u51cf\u6162\u7cdf\u7cd5\u7f51\u7edc\u4e2d\u7684\u91cd\u4f20\u901f\u5ea6\uff0c\u4ee5\u907f\u514d\u8fdb\u4e00\u6b65\u963b\u585e\u7f51\u7edc\u3002<\/li>\n<\/ol>\n<\/li>\n\n\n\n
- \u91cd\u7f6e\u91cd\u4f20\u8ba1\u65f6\u5668\u5e76\u542f\u52a8\u5b83\uff0c\u4f7f\u5176\u5728 RTO \u6beb\u79d2\u540e\u5230\u671f\uff08\u8bf7\u6ce8\u610f\uff0c\u6211\u4eec\u53ef\u80fd\u521a\u521a\u5c06 RTO \u7684\u503c\u52a0\u500d\u4e86\uff01\uff09<\/li>\n<\/ol>\n<\/li>\n\n\n\n
- \u5f53\u63a5\u6536\u65b9\u7ed9\u53d1\u9001\u65b9\u53d1\u9001\u4e00\u4e2a\u786e\u8ba4\u53f7
ackno<\/code>\uff0c\u8868\u660e\u6210\u529f\u63a5\u6536\u4e86\u65b0\u7684\u6570\u636e\uff08\u8be5\u786e\u8ba4\u53f7\u53cd\u6620\u7684\u7edd\u5bf9\u5e8f\u5217\u53f7\u5927\u4e8e\u4efb\u4f55\u4e4b\u524d\u7684\u786e\u8ba4\u53f7\uff09\u65f6\uff1a\n- \n
- \u5c06\u91cd\u4f20\u8d85\u65f6\uff08RTO\uff09\u65f6\u95f4\u91cd\u7f6e\u4e3a\u5176\u201c\u521d\u59cb\u503c\u201d\u3002<\/li>\n\n\n\n
- \u5982\u679c\u53d1\u9001\u65b9\u6709\u4efb\u4f55\u672a\u786e\u8ba4\u7684\u6570\u636e\uff0c\u5219\u91cd\u65b0\u542f\u52a8\u91cd\u4f20\u8ba1\u65f6\u5668\uff0c\u4f7f\u5176\u5728 RTO \u6beb\u79d2\u540e\u5230\u671f\uff08\u4ee5\u5f53\u524d RTO \u503c\u4e3a\u51c6\uff09\u3002<\/li>\n\n\n\n
- \u5c06\u201c\u8fde\u7eed\u91cd\u4f20\u6b21\u6570\u201d\u7684\u8ba1\u6570\u91cd\u7f6e\u4e3a\u96f6\u3002<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n\n\n\n
\u4e0d\u597d\u610f\u601d\uff0c\u521a\u624d\u8bf4\u4e86\u8fd9\u4e48\u591a\uff0c\u4e00\u4e0b\u5b50\u6655\u8fc7\u53bb\u4e86~<\/p>\n\n\n\n
\u6211\u4eec\u6765\u5b9e\u73b0TCP\u53d1\u9001\u7aef\u5427~\uff01<\/p>\n\n\n\n
\u5b9e\u73b0TCP\u53d1\u9001\u7aef<\/h4>\n\n\n\n
\u6211\u4eec\u9700\u8981\u5b9e\u73b0\u51e0\u4e2a\u65b9\u6cd5<\/p>\n\n\n\n
- \n
void push( const TransmitFunction& transmit )<\/code>:\n- \n
- \u5c3d\u53ef\u80fd\u5f80window\u91cc\u586b\u5145segment\uff0c\u4f7f\u7528
transmit<\/code>\u65b9\u6cd5\u6765\u53d1\u9001segment.<\/li>\n\n\n\n- \u6211\u4eec\u9700\u8981\u4fdd\u8bc1\u6240\u6709\u88c5\u586b\u7684
TCP Sender Messages<\/code>\u90fd\u5728window\u7684\u5bb9\u91cf\u5185\uff0c\u5c3d\u53ef\u80fd\u88c5\u586b\uff0c\u4f46\u662f\u4e0d\u8981\u8d85\u8fc7TCPConfig::MAX_PAYLOAD_SIZE<\/code>.<\/li>\n\n\n\n- \u53ef\u4ee5\u901a\u8fc7
sequence_length<\/code>\u65b9\u6cd5\u83b7\u53d6\u5df2\u7ecf\u5360\u636e\u7684seq\u6570\u3002\u6ce8\u610fSYN<\/code>\u548cFIN<\/code>\u4e5f\u5360\u636e\u4e00\u4e2aseq\u54e6<\/li>\n<\/ul>\n<\/li>\n\n\n\nvoid receive( const TCPReceiverMessage& msg )<\/code>:\n- \n
- \u4ece\u63a5\u6536\u7aef\u6536\u5230\u6d88\u606f\uff0c\u5de6\u7aef\u662f
ackno<\/code>,\u53f3\u7aef\u662fackno + window size<\/code>, \u6ce8\u610f\u6536\u5230\u6d88\u606f\u540e\u6211\u4eec\u5c31\u77e5\u9053\u88aback\u7684\u8fb9\u754c\u4e86\uff1aackno \u662f\u88aback\u7684\u6700\u5927seqnum.<\/li>\n<\/ul>\n<\/li>\n\n\n\nvoid tick( uint64_t ms_since_last_tick, const TransmitFunction& transmit )<\/code>:\n- \n
- \u8fc7\u53bb\u7684\u65f6\u95f4~ \u518d\u6b21\u63d0\u9192\u4e0d\u8981\u4f7f\u7528\u5176\u4ed6\u4efb\u4f55\u7684\u65f6\u95f4\u6e90<\/li>\n<\/ul>\n<\/li>\n\n\n\n
TCPSenderMessage make_empty_message() const<\/code>:\n- \n
- \u9700\u8981\u53d1\u9001\u4e00\u4e2a\u6b63\u786e\u8bbe\u7f6eseqno\u7684
zero-length<\/code>message.<\/li>\n\n\n\n- \u4e0d\u5360\u7528\u5b9e\u9645\u7684seqno\uff1f\u6240\u4ee5\u4e0d\u7528\u8ddf\u8e2a\u5b83\u4e3a
outstanding<\/code>.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n\u601d\u8def\u8ba8\u8bba<\/h2>\n\n\n\n
\u5b9e\u9a8c\u624b\u518c\u8bb2\u7684\u8fd8\u662f\u86ee\u6e05\u6670\u7684\uff0c\u90a3\u4e48\u5f00\u59cb\uff08\u9762\u5411\u6d4b\u8bd5\uff09\u7f16\u7a0b\u5427~<\/p>\n\n\n\n
\u6d4b\u8bd5<\/h2>\n\n\n\n
\n
cmake –build build –target check3<\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"
\u4e00\u4e8b\u672a\u6bd5\uff0c\u4e0d\u542f\u4e8c\u4e8b\u3002 \u2014\u2014yangnanbei Lab0 Warmup https:\/\/cs144.githu […]<\/p>\n","protected":false},"author":1,"featured_media":73,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,7,8,3],"tags":[40,65,51],"class_list":["post-268","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-c-c","category-network","category-network_codeing","category-coding_language","tag-c","tag-cs144","tag-tcp"],"_links":{"self":[{"href":"http:\/\/yangnanbei.top\/index.php\/wp-json\/wp\/v2\/posts\/268"}],"collection":[{"href":"http:\/\/yangnanbei.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/yangnanbei.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/yangnanbei.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/yangnanbei.top\/index.php\/wp-json\/wp\/v2\/comments?post=268"}],"version-history":[{"count":9,"href":"http:\/\/yangnanbei.top\/index.php\/wp-json\/wp\/v2\/posts\/268\/revisions"}],"predecessor-version":[{"id":369,"href":"http:\/\/yangnanbei.top\/index.php\/wp-json\/wp\/v2\/posts\/268\/revisions\/369"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/yangnanbei.top\/index.php\/wp-json\/wp\/v2\/media\/73"}],"wp:attachment":[{"href":"http:\/\/yangnanbei.top\/index.php\/wp-json\/wp\/v2\/media?parent=268"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/yangnanbei.top\/index.php\/wp-json\/wp\/v2\/categories?post=268"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/yangnanbei.top\/index.php\/wp-json\/wp\/v2\/tags?post=268"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
- \u4e0d\u5360\u7528\u5b9e\u9645\u7684seqno\uff1f\u6240\u4ee5\u4e0d\u7528\u8ddf\u8e2a\u5b83\u4e3a
- \u9700\u8981\u53d1\u9001\u4e00\u4e2a\u6b63\u786e\u8bbe\u7f6eseqno\u7684
- \u6211\u4eec\u9700\u8981\u4fdd\u8bc1\u6240\u6709\u88c5\u586b\u7684
- \u5c3d\u53ef\u80fd\u5f80window\u91cc\u586b\u5145segment\uff0c\u4f7f\u7528
- \u8bb0\u5f55\u8fde\u7eed\u91cd\u4f20\u7684\u6b21\u6570\uff0c\u5e76\u5c06\u5176\u9012\u589e\uff0c\u56e0\u4e3a\u6211\u4eec\u521a\u521a\u91cd\u4f20\u4e86\u67d0\u4e9b\u5185\u5bb9\u3002\u6211\u4eec\u7684
- \u611f\u8c22\u6211\u4eec\u4e4b\u524d\u7684\u5de5\u4f5c\uff0c\u6211\u4eec\u77e5\u9053\u4e86\u63a5\u6536\u7aef\u53ea\u8981\u6536\u5230\u6bcf\u4e2a
- \u901a\u8fc7\u8bfb
- \u6545\u800c\u5f97\u5230abs seqno\uff0c\u800c\u540e\u4e0echeckpoint\u505a\u6bd4\u8f83\uff0c\u79bb\u5f97\u6700\u8fd1\u7684\u4e3a\u51c6\u3002<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n\n\n\n
- checkpoint\uff1a\u6700\u8fd1\u4e00\u6b21convert\u5f97\u5230\u7684
- SYN\u5305\u548cFIN\u5305\u4e5f\u9700\u8981\u5360\u7528
- TCP
- ByteStream\u4e2d\u7684\u6709\u6548\u7a7a\u95f4\uff0c\u5373\u4e3a\u6240\u8c13\u6ed1\u52a8\u7a97\u53e3<\/strong>\u7684
- \u672a\u88ab\u91cd\u6392\u7684\u7b2c\u4e00\u4e2asegment\u7684\u7d22\u5f15\uff0c\u4e5f\u5373\u4e3a\u6240\u8c13\u7684
- index < expect_index < index + datasize<\/li>\n<\/ol>\n\n\n\n
- \u76f4\u63a5drop\uff0c\u56e0\u4e3a\u6240\u6709\u7684\u6570\u636e\u90fd\u5df2\u7ecf\u5199\u5165<\/li>\n<\/ul>\n\n\n\n
- expect_index > index + data_size<\/li>\n<\/ol>\n\n\n\n
- \u5f53\u91cd\u6392\u5668\u610f\u8bc6\u5230\u80fd\u5199\u5165buffer\u65f6\uff0c\u9a6c\u4e0a\u5199\u5165\u3002<\/li>\n<\/ol>\n\n\n\n
- An in-memory reliable byte stream<\/li>\n<\/ol>\n\n\n\n
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