{"id":844,"date":"2022-02-21T15:15:52","date_gmt":"2022-02-21T07:15:52","guid":{"rendered":"https:\/\/www.xianwaizhiyin.net\/?p=844"},"modified":"2022-06-11T02:49:21","modified_gmt":"2022-06-10T18:49:21","slug":"udp%e4%b8%ba%e4%bb%80%e4%b9%88%e6%b2%a1%e6%9c%89epoll","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=844","title":{"rendered":"UDP\u4e3a\u4ec0\u4e48\u6ca1\u6709epoll"},"content":{"rendered":"\n<p>\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 <a href=\"https:\/\/mirrors.edge.kernel.org\/pub\/linux\/kernel\/v4.x\/linux-4.4.4.tar.gz\">mirrors.edge.kernel.org<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u65e9\u671f\uff0c\u6211\u5bf9 \u7f51\u7edc\u534f\u8bae\u6808 \u8fd8\u4e0d\u662f\u5f88\u719f\u6089\u7684\u65f6\u5019\uff0c\u7ecf\u5e38\u5728\u7f51\u7edc\u6587\u7ae0\u4e2d\u89c1\u5230 <strong>\u591a\u8def\u590d\u7528<\/strong>\uff0cTCP \u7528 epoll \u89e3\u51b3\u9ad8\u5e76\u53d1\u95ee\u9898\u3002<\/p>\n\n\n\n<p>\u90a3\u65f6\u5019\u6211\u5c31\u6709\u4e2a\u7591\u60d1\uff0cepoll \u8fd9\u4e48\u725b\u903c\u7684\u6280\u672f\uff0c\u4e3a\u4f55\u4e0d\u7528\u5728 UDP \u91cc\u9762\uff0cUDP \u7f16\u7a0b\u4e3a\u4ec0\u4e48\u6ca1\u7528 epoll\u3002<\/p>\n\n\n\n<p>\u540e\u9762\u6211\u770b\u4e86 UDP \u8ddfTCP \u7684\u534f\u8bae\u6808\u4ee3\u7801\u5b9e\u73b0\uff0c\u8fd9\u4e2a\u7591\u60d1\u624d\u5728\u6211\u5fc3\u4e2d\u89e3\u5f00\uff0c<strong>\u591a\u8def\u590d\u7528<\/strong> \u7684\u795e\u79d8\u9762\u7eb1\u4e5f\u63ed\u5f00\u4e86\u3002<\/p>\n\n\n\n<p>\u9996\u5148\uff0c\u8bb2\u8bb2 UDP \u7f16\u7a0b\u4e3a\u4ec0\u4e48\u4e0d\u9700\u8981\u7528\u5230\u7cfb\u7edf\u7684 epoll \u51fd\u6570\uff0c<\/p>\n\n\n\n<p>Richard Stevens\u5728\u4e0d\u673d\u7684\u7ecf\u5178\u300aUnix\u7f51\u7edc\u7f16\u7a0b\u5377\u4e00\u300b\u4e2d\u5df2\u7ecf\u8bf4\u4e86\uff1a\u201c<strong>\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0cTCP\u670d\u52a1\u5668\u662f\u5e76\u53d1\u7684\uff0cUDP\u7684\u670d\u52a1\u5668\u662f\u8fed\u4ee3\u7684\u3002<\/strong>\u201d<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>google_ads_content<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u4e0a\u9762\u8fd9\u53e5\u8bdd\u53ef\u80fd\u4e0d\u592a\u5bb9\u6613\u7406\u89e3\u3002<\/p>\n\n\n\n<p>\u6211\u57fa\u4e8e\u81ea\u5df1\u7684\u7406\u89e3\uff0c\u7528\u5927\u767d\u8bdd\u8ddf\u5927\u5bb6\u8bb2\uff0c\u4e3a\u4ec0\u4e48 UDP \u7528\u4e0d\u5230 epoll \u7684\u7cfb\u7edf\u51fd\u6570\u3002<\/p>\n\n\n\n<p>\u9996\u5148\u501f\u7528\u4e00\u53e5\u8bdd\uff0c\"\u5185\u6838\u4e0d\u662f\u89e3\u51b3\u65b9\u6848\uff0c\u800c\u662f\u95ee\u9898\u6240\u5728\"\u3002<\/p>\n\n\n\n<p>linux \u64cd\u4f5c\u7cfb\u7edf\u4e3a\u4ec0\u4e48\u9700\u8981\u63d0\u4f9b epoll \u51fd\u6570\uff0c\u5728 epoll \u4e4b\u524d\u8fd8\u6709 select\/poll \u51fd\u6570\u3002\u8fd9\u4e9b\u51fd\u6570\u662f\u5e72\u4ec0\u4e48\u7684\u3002<\/p>\n\n\n\n<p>\u9996\u5148\uff0c<strong>\u591a\u8def\u590d\u7528<\/strong> \u8fd9\u4e2a\u8bcd\u662f \u9488\u5bf9 <strong>\u9762\u5411\u94fe\u63a5<\/strong> \u534f\u8bae\u7684\u8bf4\u6cd5\uff0c\u4e00\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5\u5c31\u662f\u4e00\u8def\u3002<\/p>\n\n\n\n<p>\u4f46\u662f\u5b9e\u9645\u4e0a\uff0c\u5728 IP \u5c42\uff0c\u6216\u8005\u8bf4\u5728\u7f51\u7edc\u5e95\u5c42\uff0c\u6839\u672c\u5c31\u6ca1\u6709\u4ec0\u4e48\u591a\u8def\uff0c\u53ea\u6709\u4e00\u8def\u3002\u6ca1\u9519\uff0c\u53ea\u6709\u4e00\u8def\u3002<\/p>\n\n\n\n<p>TCP \u670d\u52a1\u5668\u4e00\u822c\u662f\u8fd9\u6837\u7684\u6d41\u7a0b\uff0c\u4e00\u4e2a\u7ebf\u7a0b\u5904\u7406\u4e00\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >\/\/\u521b\u5efa\u670d\u52a1\u5668\u63cf\u8ff0\u7b26 s_fd\ns_fd = socket()\n\/\/\u628a \u670d\u52a1\u5668 fd \u7ed1\u5b9a\u5730\u5740\u7aef\u53e3\nbind(s_fd)\n\/\/\u6b63\u5f0f\u5f00\u59cb\u76d1\u542c\nlisten()\n\/\/\u963b\u585e\u7b49\u5f85 TCP 3\u6b21\u63e1\u624b\nc_fd = accept(s_fd)\n\/\/\u5f00\u542f\u65b0\u7ebf\u7a0b \u5904\u7406 c_fd \u7684\u8bfb\u5199\u3002<\/code><\/pre>\n\n\n\n<p>UDP \u670d\u52a1\u5668\u7a0b\u5e8f\u4e00\u822c\u662f\u8fd9\u6837\u7684\u6d41\u7a0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >\/\/\u521b\u5efa\u670d\u52a1\u5668\u63cf\u8ff0\u7b26 s_fd\ns_fd = socket()\n\/\/\u628a \u670d\u52a1\u5668 fd \u7ed1\u5b9a\u5730\u5740\u7aef\u53e3\nbind(s_fd)\n\/\/\u76f4\u63a5\u63a5\u53d7\u5ba2\u6237\u7aef\u6570\u636e\u5305\nrecvfrom()<\/code><\/pre>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\uff0cUDP \u5b9e\u9645\u4e0a\u662f TCP \u7684\u7b80\u5316\u7248\u3002recvfrom \u662f\u4e00\u4e2a\u963b\u585e\u51fd\u6570\u3002 IP \u5c42\u6709\u6570\u636e\u5305\u5230\u4e86\uff0c\u5c31\u68c0\u67e5 IP header \u7684\u534f\u8bae\u5b57\u6bb5\uff0c\u5224\u65ad IP body\u91cc\u662f\u4e0d\u662f udp \u7684\u6570\u636e\uff0c\u5982\u679c\u662f\u5c31\u6fc0\u6d3b recvfrom()\uff0c\u8fd9\u6837 UDP \u5c31\u80fd\u62ff\u5230 \u5ba2\u6237\u7aef\u7684\u6570\u636e\u3002\u8fd9\u4e2a\u6fc0\u6d3b\uff0c\u597d\u50cf\u662f\u4e00\u4e2a\u8f6f\u4e2d\u65ad\u8fd8\u662f\u4e00\u4e2a\u4fe1\u53f7\uff0c\u5177\u4f53\u5728 linux 4.4 \u5185\u6838\u7684\u54ea\u4e00\u5757\u4ee3\u7801\uff0c\u6211\u9700\u8981\u82b1\u70b9\u65f6\u95f4\u627e\u4e00\u627e\uff0c\u5148\u57cb\u4e2a\u5751\uff0c\u540e\u7eed\u8865\u5145\uff0c\u6682\u65f6\u7406\u89e3\u4e3a\u6fc0\u6d3b\u5c31\u884c\u3002<\/p>\n\n\n\n<p>\u4ece UDP \u8ddf IP \u5c42\u7684\u4ea4\u4e92\u6765\u770b\uff0c\u4f60\u53ef\u4ee5\u770b\u5230\uff0c\u5b9e\u9645\u4e0a\u6ca1\u6709\u4ec0\u4e48\u591a\u8def\uff0c\u6240\u6709\u7684\u5ba2\u6237\u7aef\u6570\u636e\u90fd\u5728\u4e00\u8def\u91cc\u9762\u4f20\u9012\u7ed9 IP \u5c42\uff0c\u518d\u7531 IP \u5c42\u4f20\u7ed9 UDP \u5c42<code class=\"prettyprint\" >recvfrom()<\/code>\u3002<\/p>\n\n\n\n<p>\u65e2\u7136\u5982\u6b64\uff0c\u90a3\u4e3a\u4ec0\u4e48 TCP \u4f1a\u51fa\u73b0 <strong>\u591a\u8def<\/strong>\uff0c\u800c\u4e14\u56e0\u4e3a <strong>\u591a\u8def<\/strong> \u5e26\u6765\u6027\u80fd\u95ee\u9898\uff0c\u9700\u8981\u518d\u7528 <strong>epoll<\/strong> \u89e3\u51b3\u3002<\/p>\n\n\n\n<p>\u8fd9\u91cc\u5c31\u9700\u8981\u5148\u8bb2\u89e3 \u4e00\u4e0b\u4ec0\u4e48\u662f \u9762\u5411\u8fde\u63a5\u7684\u534f\u8bae\uff1f<\/p>\n\n\n\n<p>\u6211\u4eec\u5728\u6559\u79d1\u4e66\u7ecf\u5e38\u770b\u5230 \uff0cTCP \u662f\u9762\u5411\u8fde\u63a5\u7684\uff0c\u800c UDP \u4e0d\u662f\u3002<\/p>\n\n\n\n<p>\u5b9e\u9645\u4e0a\u4e0a\u9762\u8fd9\u53e5\u8bdd\u662f\u4ec0\u4e48\u610f\u601d\u5462\uff1f<\/p>\n\n\n\n<p>\u9996\u5148\uff0cTCP \u7684\u5b9e\u73b0\u662f\u5728linux \u5185\u6838\u4ee3\u7801\u91cc\u9762\u7684\uff0c\u6240\u4ee5 TCP \u5c5e\u4e8elinux \u5185\u6838\u7684\u4e00\u90e8\u5206\u3002<\/p>\n\n\n\n<p>\u9996\u5148\u8bb2\u89e3\u4e00\u4e0b\uff0c\u8fde\u63a5\u72b6\u6001\uff0c\u5b83\u5e76\u4e0d\u662f\u7279\u522b\u771f\u5b9e\u7684\u4e00\u4e2a\u4e1c\u897f\uff0c\u8fd9\u4e2a\u4e1c\u897f\u6bd4\u8f83\u865a\uff0c\u8fde\u63a5\u72b6\u6001\uff0c\u53ea\u662f\u5185\u5b58\u91cc\u9762\u7684\u4e00\u4e2a\u53d8\u91cf\uff0c\u800c\u4e14\u8fd8\u4e0d\u662f\u5b9e\u65f6\u66f4\u65b0\u7684\u3002<\/p>\n\n\n\n<p>\u4e3a\u4ec0\u4e48\u8bf4\u5b83\u4e0d\u662f\u5b9e\u65f6\u66f4\u65b0\u7684\uff0c\u5c31\u662f\u5f53\u5e95\u5c42\u7f51\u7edc\uff0c\u901a\u4fe1\u94fe\u8def\u4e0d\u53ef\u8fbe\u7684\u65f6\u5019\uff0c\u4ec0\u4e48\u662f\u901a\u4fe1\u94fe\u8def\u4e0d\u53ef\u8fbe\uff1f\u76f4\u63a5\u628a\u4e2d\u95f4\u8def\u7531\u7684\u7f51\u7ebf\u62d4\u5f00\u5c31\u662f\u4e86\u3002<\/p>\n\n\n\n<p>\u5f53\u901a\u4fe1\u94fe\u8def\u4e0d\u53ef\u8fbe\u7684\u65f6\u5019\uff0cTCP \u91cc\u9762\u7684\u94fe\u63a5\u72b6\u6001\u4e0d\u4f1a\u975e\u5e38\u5feb\u7684\u66f4\u6539\u4e3a\u65ad\u5f00\u72b6\u6001\u3002\u4e4b\u524d\u5728 \u300a<strong>\u89c6\u9891\u4f20\u8f93\u534f\u8bae\u8bbe\u8ba1<\/strong>\u300b \u6f14\u793a\u8fc7\uff0c\u628a\u7f51\u7ebf\u62d4\u5f00\u4e4b\u540e\uff0cTCP \u8981\u7ecf\u8fc7\u591a\u6b21\u91cd\u4f20\u5931\u8d25\uff0c\u624d\u4f1a\u8ba4\u5b9a\u5e95\u5c42 \u901a\u4fe1\u94fe\u8def\u4e0d\u53ef\u8fbe\uff0c\u7136\u540e\u8fd4\u56de\u4e00\u4e2a\u4fe1\u53f7\u7ed9\u8c03\u7528\u5c42\u3002\u5f53\u7f51\u7ebf\u65ad\u5f00\u7684\u65f6\u5019\uff0cTCP \u5ba2\u6237\u7aef\u4ece \u91cd\u8bd5 \u5230 \u786e\u8ba4\u94fe\u63a5\u65ad\u5f00\u7528\u4e86 19 \u79d2\u624d\u77e5\u9053\u7f51\u7ebf\u65ad\u5f00\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u8bf4 TCP \u91cc\u9762\u7684\u8fde\u63a5\u72b6\u6001 \u53ea\u662f\u5185\u5b58\u7684\u4e00\u4e2a\u53d8\u91cf\uff0c\u4e00\u4e2a\u865a\u62df\u7684\u4e1c\u897f\u3002<\/p>\n\n\n\n<p>\u518d\u6765\u8bf4\u8bf4\uff0c\u4e3a\u4ec0\u4e48\u534f\u8bae\u6808\u7684\u53d1\u5c55\uff0c\u4f1a\u6f14\u53d8\u51fa \u8fde\u63a5\u72b6\u6001 \u8fd9\u4e2a\u5185\u5b58\u53d8\u91cf \uff1f<\/p>\n\n\n\n<p>\u8981\u8bb2\u8fd9\u4e2a\u95ee\u9898\uff0c\u5c31\u9700\u8981\u5148\u8bb2\u4e3a\u4ec0\u4e48 \u5e7f\u57df\u7f51\u7684 \u534f\u8bae\uff0c\u57fa\u672c\u4e0a\u90fd\u6709 3\u6b21\u63e1\u624b\uff0cTCP\uff0cUDT\uff0cSRT\uff0c\u4f60\u53ef\u4ee5\u770b\u5230\u8fd9\u4e9b\u534f\u8bae\u90fd\u67093\u6b21\u63e1\u624b\u3002<\/p>\n\n\n\n<p>TCP \u76843\u6b21\u63e1\u624b\u662f\u81ea\u5e26\u7684\uff0cUDT \u662f\u57fa\u4e8e UDP \u7684\u534f\u8bae\uff0c\u81ea\u5df1\u5b9e\u73b0 3\u6b21\u63e1\u624b\uff0cSRT \u662f\u57fa\u4e8e UDT \u7684\u3002<\/p>\n\n\n\n<p>\u8fd9\u4e2a\u5148\u629b\u51fa\u4e2a\u95ee\u9898\uff0cUDT \u65e2\u7136\u662f\u7528 UDP \u5b9e\u73b0\u7684\uff0c UDP \u672c\u8eab\u6ca1\u6709 3\u6b21\u63e1\u624b\uff0c\u6ca1\u6709\u4e0d\u662f\u66f4\u597d\uff0c\u53ef\u4ee5\u5c11\u51e0\u6b21 RTT \u7684\u65f6\u95f4\uff0c\u901a\u4fe1\u66f4\u5feb\u3002<\/p>\n\n\n\n<p>\u4e3a\u4ec0\u4e48 UDT \u8fd8\u8981\u81ea\u5df1\u641e\u4e00\u5957 3 \u6b21\u63e1\u624b\uff0c\u4e0d\u75283\u6b21\u63e1\u624b\u4e0d\u662f\u66f4\u5feb\u5417\uff1f<\/p>\n\n\n\n<p>\u4ece\u76f4\u89c9\u6765\u8bb2\uff0c\u6ca1\u67093\u6b21\u63e1\u624b\uff0c\u786e\u5b9e\u4f1a\u66f4\u5feb\uff0c\u4f8b\u5982 IP \u5c42\uff0cMAC \u5c42\u7684\u5404\u79cd\u534f\u8bae\uff0c\u5c31\u6ca1\u6709\u4ec0\u4e483\u6b21\u63e1\u624b\u3002<\/p>\n\n\n\n<p>\u4f46\u662f\uff0c\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cIP \u5c42 MAC \u5c42\uff0c\u4ed6\u662f\u5de5\u4f5c\u5728\u8def\u7531\u5668\uff0c\u4ea4\u6362\u673a\u91cc\u9762\u7684\uff0c\u4ed6\u7684\u6570\u636e\u5305\u53d1\u7ed9\u4e0b\u4e00\u7ad9\u5c31\u5b8c\u4e8b\u4e86\uff0c\u901a\u5e38\u4e0b\u4e00\u7ad9\u4e0d\u662f\u592a\u8fdc\u3002<\/p>\n\n\n\n<p>\u800c UDT\uff0cTCP\uff0c\u4ed6\u4eec\u7684\u4f20\u8f93\uff0c\u53ef\u80fd\u662f\u4ece\u4e1c\u5927\u9646\u5230\u5317\u6781\uff0c100M\u7684\u6570\u636e\uff0c\u4ece\u4e1c\u5927\u9646\u67d0\u4e2a\u4e3b\u673a\u53d1\u51fa\u6765\uff0c\u7ecf\u8fc7\u90a3\u4e48\u591a\u8def\u7531\u5668\uff0c\u4ea4\u6362\u673a\uff0c\u8de8\u8d8a\u6d77\u6d0b\uff0c\u5230\u8fbe\u5317\u6781\u7684\u67d0\u53f0\u670d\u52a1\u5668\u3002\u5982\u679c\u6ca1\u6709 3\u6b21\u63e1\u624b\uff0c\u63d0\u53d6\u6c9f\u901a\u4e00\u4e0b\u53cc\u65b9\u7684\u4e00\u4e9b\u60c5\u51b5\uff0c100M\u7684\u4f20\u8f93\u6548\u7387\u4f1a\u6781\u5176\u4f4e\u4e0b\uff0c\u5e76\u4e0d\u4f1a\u56e0\u4e3a\u6ca1\u6709 3\u6b21\u63e1\u624b\u800c\u66f4\u5feb\uff0c\u76f8\u53cd\uff0c\u7531\u4e8e\u4e0a\u5c42\u534f\u8bae\u6808\u6ca1\u6709\u63e1\u624b\u5bfc\u81f4\u4e00\u4e9b\u4fe1\u606f\u638c\u63e1\u4e0d\u5168\u9762\uff0c\u53d1\u9001\u8ddf\u63a5\u53d7\u7b56\u7565\u4e0d\u884c\uff0c\u4f1a\u5bfc\u81f4 IP \u5c42\u4e22\u5305\uff0c\u5927\u91cf\u91cd\u4f20\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5 3 \u6b21\u63e1\u624b\uff0c\u5e72\u7684\u662f\u4ec0\u4e48\u7684\u4e8b\uff1f\u5c31\u662f\u63d0\u524d\u6c9f\u901a\u4e00\u4e0b\u53cc\u65b9 \u7684\u4fe1\u606f\uff0c\u4f8b\u5982\u6211\u7684 MTU \u662f\u591a\u5c11\uff0c\u4f60\u7684MTU\u662f\u591a\u5c11\u4e4b\u7c7b\u7684\u3002<\/p>\n\n\n\n<p>\u8fd9\u91cc\u518d\u629b\u51fa\u53e6\u4e00\u4e2a\u95ee\u9898\uff0c\u4e3a\u4ec0\u4e48\u662f3\u6b21\u63e1\u624b\uff0c\u4e0d\u662f4\u6b21\uff0c2\u6b21\uff1f<\/p>\n\n\n\n<p>\u8fd9\u4e2a\u95ee\u9898\u5b9e\u9645\u4e0a\u662f\u4e00\u4e2a ACK \u8bbe\u8ba1\u95ee\u9898\uff0c\u7531\u4e8e IP \u5c42\u4e0d\u53ef\u9760\u4f1a\u4e22\u5305\uff0c\u7279\u522b\u662f\u7ecf\u8fc7\u90a3\u4e48\u591a\u8def\u7531\u5668\u8f6c\u53d1\uff0c\u4e22\u5305\u7684\u6982\u7387\u4f1a\u589e\u52a0\uff0c\u4f8b\u5982\u8def\u7531\u5668\u8d1f\u8f7d\u592a\u9ad8\uff0c\u4ed6\u5c31\u4f1a\u4e22\u5f03\u6570\u636e\u5305\u51cf\u8f7b\u8d1f\u8f7d\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u57fa\u4e8e IP \u5c42\u7684\u534f\u8bae\uff0c\u60f3\u8981\u5728\u5e7f\u57df\u7f51\u4e0a\u5b9e\u73b0\u53ef\u9760\u4f20\u8f93\uff0c\u90fd\u9700\u8981\u81ea\u5df1\u5b9e\u73b0\u4e00\u5957 ACK \u673a\u5236\uff0cTCP \u81ea\u5e26 ACK\uff0cUDT \u534f\u8bae\u662f\u81ea\u5df1\u5b9e\u73b0 ACK\u3002<\/p>\n\n\n\n<p>\u56e0\u4e3a ACK \u673a\u5236\u7684\u51fa\u73b0\uff0c\u518d\u52a0\u4e0a \u5e7f\u57df\u7f51\u4e0a\u4f20\u8f93\u53ef\u9760\u6570\u636e\u9700\u8981\u63d0\u524d\u6c9f\u901a\uff0c\u6c9f\u901a\u597d\u624d\u5f00\u59cb\u6b63\u5f0f\u5f00\u59cb\u4f20\u8f93\u6570\u636e\u3002<\/p>\n\n\n\n<p>ACK + \u63d0\u524d\u6c9f\u901a\uff0c\u5c31\u5f62\u6210\u4e86 3\u6b21\u63e1\u624b\uff0c\u4e3e\u4e2a\u4f8b\u5b50\u3002<\/p>\n\n\n\n<p>\u5ba2\u6237\u7aef\u8981\u5f00\u59cb\u4f20\u6570\u636e\u7ed9\u670d\u52a1\u5668\uff0c\u5ba2\u6237\u7aef\u5148 \u53d1\u4e00\u4e2a UDP \u5305\uff0c\u91cc\u9762\u6709\u4ed6\u7684MTU\u7b49\u4fe1\u606f\uff0c\u7136\u540e\u670d\u52a1\u5668\u7aef\u6536\u5230\u4e86\u8fd9\u4e2a UDP \u5305\uff0c\u56e0\u4e3a\u8981\u6709\u786e\u8ba4\u673a\u5236\uff0c\u6240\u4ee5 \u670d\u52a1\u5668\u9700\u8981 \u53d1\u4e00\u4e2aACK \u7684UDP\u5305\u7ed9 \u5ba2\u6237\u7aef\uff0c\u544a\u8bc9\u5ba2\u6237\u7aef\uff0c\u670d\u52a1\u5668\u5df2\u7ecf\u6536\u5230\u4e86 \u4ed6 MTU UDP\u5305\u3002\u4f46\u662f\u540c\u65f6\uff0c\u670d\u52a1\u5668\u4e5f\u9700\u8981\u544a\u8bc9\u5ba2\u6237\u7aef\u81ea\u5df1\u7684\u4e00\u4e9b\u4fe1\u606f\uff0c\u4e3a\u4e86\u63d0\u9ad8\u6548\u7387\uff0c\u670d\u52a1\u5668\u7684MTU\u4fe1\u606f\u4e5f\u4f1a\u653e\u8fdb\u53bb ACK\u91cc\u9762\u4e00\u8d77\u8fd4\u56de\u53bb\u7ed9\u5ba2\u6237\u7aef\u3002<\/p>\n\n\n\n<p>\u7136\u540e \u5ba2\u6237\u7aef\u6536\u5230\u4e86\u670d\u52a1\u5668\u7684 ACK\uff0c\u5ba2\u6237\u7aef\u77e5\u9053 MTU \u4fe1\u606f\u670d\u52a1\u5668\u7aef\u62ff\u5230\u4e86\uff0c\u5ba2\u6237\u7aef\u5c31\u4e0d\u4f1a\u91cd\u4f20\u3002\u540c\u65f6\uff0c\u5ba2\u6237\u7aef\u4e5f\u6536\u5230\u670d\u52a1\u5668\u7684MTU UDP \u5305\uff0c\u5ba2\u6237\u7aef\u9700\u8981\u56de\u590d\u670d\u52a1\u5668\u4e00\u4e2a ACK\uff0c\u8bf4\u81ea\u5df1\u62ff\u5230\u4e86\u3002<\/p>\n\n\n\n<p>\u4e0a\u9762\u8fd9\u4e9b\u6d41\u7a0b\uff0c\u5c31\u662f3\u6b21\u63e1\u624b\uff0c\u4e5f\u5c31\u662f TCP \u91cc\u9762\u7684 <code class=\"prettyprint\" >SYN<\/code> -&gt; <code>ACK+SYN<\/code> -&gt; <code>ACK<\/code> \u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u56de\u5230\u4e4b\u524d\u7684\u95ee\u9898\uff0c\u4e3a\u4ec0\u4e48 UDP \u4e0d\u9700\u8981\u591a\u8def\u590d\u7528\uff0c\u662f\u56e0\u4e3a UDP \u4ed6\u672c\u8eab\u6ca1\u5b9e\u73b0 3\u6b21\u63e1\u624b\u8ddf\u94fe\u63a5\u72b6\u6001\u7684\u529f\u80fd\u3002\u90a3\u662f\u4e0d\u662f\u5982\u679c\u4e00\u4e2a\u57fa\u4e8e UDP \u7684\u534f\u8bae\u6808 \u5b9e\u73b0\u4e863\u6b21\u63e1\u624b\u8ddf\u5efa\u7acb\u8fde\u63a5\uff0c\u5c31\u4f1a\u9700\u8981\u591a\u8def\u590d\u7528\uff0c\u5176\u5b9e\u4e5f\u4e0d\u662f\u3002<\/p>\n\n\n\n<p>\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u57fa\u4e8eUDP \u8bbe\u8ba1\u4e00\u4e2a\u534f\u8bae\u3002\u6211\u628a\u4ed6 \u53eb UDL\u3002<\/p>\n\n\n\n<p>\u7b80\u6d01\u7684\u6d41\u7a0b\u5982\u4e0b\uff1a<\/p>\n\n\n\n<p>1\uff0c\u670d\u52a1\u5668 <code class=\"prettyprint\" >recvfrom()<\/code> \u963b\u585e\u7b49\u5f85 IP \u5c42\u628a IP body \u7684\u6570\u636e\u4e22\u4e0a\u6765\u3002<\/p>\n\n\n\n<p>2\uff0c\u670d\u52a1\u5668 <code class=\"prettyprint\" >recvfrom()<\/code> \u62ff\u5230\u4e86 \u5ba2\u6237\u7aef\u7684 UDP \u6570\u636e\uff0c\u6709\u7aef\u53e3\uff0c\u6709\u5ba2\u6237\u7aefIP\uff0c\u6709\u5ba2\u6237\u7aefMTU \u8fd9\u4e9b\u6570\u636e\u3002<\/p>\n\n\n\n<p>3\uff0c\u670d\u52a1\u5668\u5f00\u59cb\u56de\u590d ACK\uff0c3\u6b21\u63e1\u624b\u7701\u7565\uff0c3\u6b21\u63e1\u624b \u6210\u529f\u4e4b\u540e \u7136\u540e\u6211\u670d\u52a1\u5668 \u521b\u5efa\u4e00\u4e2a map\uff0c\u628a \u5ba2\u6237\u7aef IP+PORT \u4f5c\u4e3a\u4e00\u4e2akey\u4f20\u8fdb\u53bb map\uff0c\u4ee3\u8868\u8fd9\u4e2a \u5ba2\u6237\u7aef IP+PORT \u5df2\u7ecf\u5efa\u7acb\u8fde\u63a5\u4e86\u3002\u53ef\u4ee5\u6b63\u5f0f\u4f20\u8f93\u6570\u636e\u3002<\/p>\n\n\n\n<p>4\uff0c\u670d\u52a1\u5668 \u7ee7\u7eed \u963b\u585e \u5728 <code class=\"prettyprint\" >recvfrom()<\/code> \u7b49\u5f85\u6570\u636e\u3002<\/p>\n\n\n\n<p>5\uff0c\u670d\u52a1\u5668 \u518d\u6b21\u4ece <code class=\"prettyprint\" >recvfrom()<\/code> \u62ff\u5230 UDP \u5305\uff0c\u68c0\u6d4bUDP \u5305\u91cc\u9762\u6709\u6ca1\u6709 SYN \uff0c\u5982\u679c\u6709\u5c31\u662f\u5f00\u4e00\u4e2a\u65b0\u7684\u94fe\u63a5\uff0c\u6ca1\u6709SYN\u5c31\u5728 map\u91cc\u9762\u627e\u5ba2\u6237\u7aef IP+PORT\uff0c\u5982\u679c\u5b58\u5728\u5c31\u7ee7\u7eed\u8d70\uff0c\u5982\u679c\u4e0d\u5b58\u5728\u5c31\u4ee3\u8868\u4e4b\u524d\u6ca1\u5efa\u7acb\u8fde\u63a5\uff0c\u6ca1\u6c9f\u901a\u597d\uff0c\u4e0d\u80fd\u4f20\u6570\u636e\uff0c\u76f4\u63a5\u628a RST \u6807\u8bb0\u653e\u8fdb\u53bb UDP \u53d1\u56de\u53bb\u3002<\/p>\n\n\n\n<p>6\uff0c\u8fd9\u91cc \u670d\u52a1\u5668\u6bcf\u6b21 \u4ece <code class=\"prettyprint\" >recvfrom()<\/code> \u62ff\u5230 UDP \u5305\uff0c\u90fd\u662f\u4e22\u7ed9\u7ebf\u7a0b\u6c60\u5904\u7406\uff0c\u4e3b\u7ebf\u7a0b\u4e0d\u963b\u585e\u5904\u7406\u3002<\/p>\n\n\n\n<p>\u4e0a\u9762\u7684\u6d41\u7a0b\uff0c\u6211\u57fa\u4e8e UDP \u5b9e\u73b0\u4e86\u4e00\u4e2a 3\u6b21\u63e1\u624b\uff0c\u8ddf\u94fe\u63a5\u72b6\u6001\uff0c\u5927\u5bb6\u89c9\u5f97\u91cc\u9762\u6709\u6ca1\u7528\u5230 \u591a\u8def\u590d\u7528\uff1f\u6211\u89c9\u5f97 \u6ca1\u6709\uff0c\u7531\u6b64\u81f3\u7ec8\u90fd\u662f\u6709\u4e00\u4e2a\u8def\uff0c\u6240\u6709\u5ba2\u6237\u7aef\u6570\u636e\u90fd\u662f\u901a\u8fc7<\/p>\n\n\n\n<p><code class=\"prettyprint\" >recvfrom()<\/code>\u62ff\u5230\u4e86\uff0c\u7136\u540e\u4f20\u7ed9\u7ebf\u7a0b\u6c60\u5904\u7406\u3002<\/p>\n\n\n\n<p>\u90a3\u4e3a\u4ec0\u4e48 TCP \u6709\u591a\u8def\u590d\u7528\u8ddf EPOLL\uff0c\u662f\u56e0\u4e3a TCP \u628a 3\u6b21\u63e1\u624b\uff0c\u94fe\u63a5\u72b6\u6001\u7b49\u7b49\u4e1c\u897f\uff0c\u5c01\u88c5\u8fdb\u5185\u90e8\u903b\u8f91\uff0c\u505a\u4e86\u62bd\u8c61\uff0c\u65b9\u4fbf\u8c03\u7528\u5c42\u4f7f\u7528\u3002<\/p>\n\n\n\n<p>\u4e0a\u5c42\u534f\u8bae\u6808\uff0c\u5b9e\u73b0\u4e863\u6b21\u63e1\u624b\u8ddf\u94fe\u63a5\u72b6\u6001\u7684\u529f\u80fd \u5e76\u4e0d\u4f1a \u51fa\u73b0\u591a\u8def\u590d\u7528\uff0c\u800c\u662f\u7531\u4e8e\u5bf9\u8fd9\u4e9b\u4e1c\u897f\u505a\u4e86\u5c01\u88c5\u624d\u4f1a\u51fa\u73b0\u591a\u8def\u590d\u7528\uff0c\u8fd9\u4e2a\u5177\u4f53\u662f\u4ec0\u4e48\u610f\u601d\u5462\uff1f<\/p>\n\n\n\n<p>\u6211\u518d\u4ed4\u7ec6\u8bb2\u89e3\u4e00\u4e0b\uff0cLinux \u91cc\u9762\u6709\u4e2a\u8c1a\u8bed \"\u4e00\u5207\u7686\u6587\u4ef6\"\uff0c\u5305\u62ec TCP \u7684socket \u4e5f\u662f\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c tcp \u7684socketfd \u662f\u8ddf \u6587\u4ef6fd\uff0c\u590d\u7528\u4e86\u4e00\u4e2a\u5185\u6838\u7684\u6570\u636e\u7ed3\u6784\uff0c\u7531\u4e8e linux \u5185\u6838\u6253\u5f00\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u6709\u9650\u5236\u4e86\uff0c\u8fd9\u4e2a\u5c01\u88c5\u901a\u7528\u8bbe\u8ba1\uff0c\u5c31\u4f1a\u5bfc\u81f4\u4e00\u4e9b\u95ee\u9898\u3002<\/p>\n\n\n\n<p>\u5927\u5bb6\u53ef\u4ee5\u770b\u770b \u4e0a\u9762\u7684 UDL \u534f\u8bae\u8bbe\u8ba1\uff0c\u5e76\u6ca1\u6253\u5f00\u4ec0\u4e48\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u6211\u53ea\u662f\u7533\u8bf7\u4e86\u5757\u5185\u5b58\uff0c\u6765\u5b58 \u5ba2\u6237\u7aef IP+PORT \u7684\u94fe\u63a5\u72b6\u6001\u3002<\/p>\n\n\n\n<p>\u56e0\u4e3aTCP \u7684\u5185\u90e8\u5b9e\u73b0\u7528\u4e86\u6587\u4ef6\u63cf\u8ff0\u7b26\u8fd9\u4e2a\u6570\u636e\u7ed3\u6784\uff0c\u6240\u4ee5\u4ed6 \u53d7\u5230\u4e86 \u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u6570\u91cf\u9650\u5236\u3002\u8fd9\u662f TCP \u5b9e\u73b0\u6ca1\u8003\u8651\u7684\u95ee\u9898\u3002TCP \u5b9e\u73b0\u662flinux\u5185\u6838\u5b9e\u73b0\u7684\u4e00\u90e8\u5206\u3002<\/p>\n\n\n\n<p>TCP \u91cc\u9762\u7684\u5ba2\u6237\u7aef socketfd\uff0c\u5b9e\u9645\u4e0a\u8ddf\u4e0a\u9762\u7684 UDL \u4e00\u6837\uff0c\u53ea\u662f\u628a \u5ba2\u6237\u7aef IP+PORT \u8f6c\u6210\u4e00\u4e2a 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