{"id":12152,"date":"2024-03-05T10:30:44","date_gmt":"2024-03-05T02:30:44","guid":{"rendered":"https:\/\/blog.pfchina.org\/?p=12152"},"modified":"2024-03-05T10:41:07","modified_gmt":"2024-03-05T02:41:07","slug":"openvpn-dco","status":"publish","type":"post","link":"https:\/\/blog.pfchina.org\/?p=12152","title":{"rendered":"OpenVPN DCO\u5b58\u5728\u7684\u95ee\u9898"},"content":{"rendered":"

OpenVPN\u6700\u521d\u7531James Yonan\u5f00\u53d1\uff0c\u4e8e2001\u5e745\u670813\u65e5\u9996\u6b21\u53d1\u5e03\u3002\u5b83\u652f\u6301\u8bb8\u591a\u5e38\u89c1\u5e73\u53f0\uff08\u4f8b\u5982 FreeBSD\u3001OpenBSD\u3001Dragonfly\u3001AIX \u7b49\uff09\u548c\u4e00\u4e9b\u4e0d\u592a\u5e38\u89c1\u7684\u5e73\u53f0\uff08macOS\u3001Linux\u3001Windows\uff09 \u3002<\/span>\u5b83\u652f\u6301\u70b9\u5bf9\u70b9\u548c\u5ba2\u6237\u7aef-\u670d\u52a1\u5668\u6a21\u578b\uff0c\u5177\u6709\u9884\u5171\u4eab\u5bc6\u94a5\u3001\u8bc1\u4e66\u6216\u57fa\u4e8e\u7528\u6237\u540d\/\u5bc6\u7801\u7684\u8eab\u4efd\u9a8c\u8bc1\u3002<\/span><\/p>\n

\u5b58\u5728\u7684\u95ee\u9898<\/h1>\n

\u867d\u7136 OpenVPN \u975e\u5e38\u597d\uff0c\u4f46\u663e\u7136\u80af\u5b9a\u5b58\u5728\u4e00\u4e2a\u95ee\u9898\uff0c<\/span>\u90a3\u5c31\u662f OpenVPN \u662f\u4f5c\u4e3a\u5355\u7ebf\u7a0b\u7528\u6237\u7a7a\u95f4\u8fdb\u7a0b\u5b9e\u73b0\u7684\u3002<\/span>\u5b83\u4f7f\u7528 if_tun \u5c06\u6570\u636e\u5305\u6ce8\u5165\u7f51\u7edc\u5806\u6808\uff0c\u56e0\u6b64\u5176\u6027\u80fd\u672a\u80fd\u8ddf\u4e0a\u5f53\u524d\u7684\u8fde\u63a5\u901f\u7387\u3002\u5b83\u4f7f\u5f97\u5229\u7528\u73b0\u4ee3\u591a\u6838\u786c\u4ef6\u6216\u52a0\u5bc6\u5378\u8f7d\u786c\u4ef6\u53d8\u5f97\u56f0\u96be\u3002<\/span><\/p>\n

<\/a><\/p>\n

OpenVPN\u6027\u80fd\u7684\u4e3b\u8981\u95ee\u9898\u662f\u5176\u7528\u6237\u7a7a\u95f4\u6027\u8d28\u3002\u4f20\u5165\u6d41\u91cf\u7531 NIC \u63a5\u6536\uff0cNIC \u901a\u5e38\u4f1a\u5c06\u6570\u636e\u5305\u901a\u8fc7 DMA \u4f20\u8f93\u5230\u5185\u6838\u5185\u5b58\u4e2d\u3002<\/span>\u7136\u540e\u7531\u7f51\u7edc\u5806\u6808\u8fdb\u4e00\u6b65\u5904\u7406\uff0c\u76f4\u5230\u627e\u51fa\u6570\u636e\u5305\u5c5e\u4e8e\u54ea\u4e2a\u5957\u63a5\u5b57\uff0c\u5e76\u5c06\u5176\u4f20\u9012\u5230\u7528\u6237\u7a7a\u95f4\u3002\u8be5\u5957\u63a5\u5b57\u53ef\u4ee5\u662f UDP \u6216 TCP\u3002<\/span><\/p>\n

\u5c06\u6570\u636e\u5305\u4f20\u9012\u5230\u7528\u6237\u7a7a\u95f4\u6d89\u53ca\u590d\u5236\u6570\u636e\uff0c\u6b64\u65f6\u7528\u6237\u7a7a\u95f4 OpenVPN \u8fdb\u7a0b\u9a8c\u8bc1\u5e76\u89e3\u5bc6\u6570\u636e\u5305\uff0c\u5e76\u4f7f\u7528 if_tun \u5c06\u5176\u91cd\u65b0\u6ce8\u5165\u5230\u7f51\u7edc\u5806\u6808\u4e2d\u3002\u8fd9\u610f\u5473\u7740\u9700\u8981\u5c06\u7eaf\u6587\u672c\u6570\u636e\u5305\u590d\u5236\u56de\u5185\u6838\u4ee5\u8fdb\u884c\u8fdb\u4e00\u6b65\u5904\u7406\u3002<\/span><\/p>\n

\u8fd9\u4e9b\u4e0a\u4e0b\u6587\u5207\u6362\u548c\u6765\u56de\u590d\u5236\u4e0d\u53ef\u907f\u514d\u5730\u4f1a\u5bf9\u6027\u80fd\u4ea7\u751f\u91cd\u5927\u5f71\u54cd\u3002\u8fd9<\/span>\u5728\u5f53\u524d\u7684\u67b6\u6784\u4e2d\uff0c\u5f88\u96be\u5b9e\u73b0\u660e\u663e\u7684\u6027\u80fd\u6539\u8fdb\u3002<\/span><\/p>\n

\u4ec0\u4e48\u662fDCO<\/span><\/h1>\n

\u73b0\u5728\u6211\u4eec\u5df2\u7ecf\u786e\u5b9a\u4e86\u95ee\u9898\u6240\u5728\uff0c\u6211\u4eec\u53ef\u4ee5\u5f00\u59cb\u8003\u8651\u89e3\u51b3\u65b9\u6848\u3002<\/span>\u5982\u679c\u6211\u4eec\u7684\u95ee\u9898\u662f\u4e0a\u4e0b\u6587\u5207\u6362\u5230\u7528\u6237\u7a7a\u95f4\uff0c\u90a3\u4e48\u4e00\u79cd\u53ef\u884c\u7684\u89e3\u51b3\u65b9\u6848\u662f\u5c06\u5de5\u4f5c\u4fdd\u7559\u5728\u5185\u6838\u5185\u90e8\uff0c\u8fd9\u5c31\u662f DCO\uff08\u6570\u636e\u901a\u9053\u5378\u8f7d\uff09\u6240\u505a\u7684\u3002<\/span><\/p>\n

<\/a><\/p>\n

DCO \u5c06\u6570\u636e\u901a\u9053\uff08\u5373\u52a0\u5bc6\u64cd\u4f5c\u548c\u6d41\u91cf\u96a7\u9053\uff09\u79fb\u81f3\u5185\u6838\u4e2d\u3002\u5b83\u901a\u8fc7\u65b0\u7684\u865a\u62df\u8bbe\u5907\u9a71\u52a8\u7a0b\u5e8f if_ovpn \u6765\u5b8c\u6210\u6b64\u64cd\u4f5c\u3002<\/span>OpenVPN \u7528\u6237\u7a7a\u95f4\u8fdb\u7a0b\u4ecd\u7136\u8d1f\u8d23\u8fde\u63a5\u8bbe\u7f6e\uff08\u5305\u62ec\u8eab\u4efd\u9a8c\u8bc1\u548c\u9009\u9879\u534f\u5546\uff09\uff0c\u5e76\u901a\u8fc7\u65b0\u7684 ioctl \u63a5\u53e3\u4e0e if_ovpn \u9a71\u52a8\u7a0b\u5e8f\u8fdb\u884c\u534f\u8c03\u3002<\/span><\/p>\n

OpenVPN \u9879\u76ee\u8ba4\u4e3a DCO \u7684\u5f15\u5165\u662f\u5220\u9664\u4e00\u4e9b\u9057\u7559\u529f\u80fd\u5e76\u8fdb\u884c\u4e00\u4e9b\u5e38\u89c4\u6574\u7406\u7684\u597d\u673a\u4f1a\u3002\u4f5c\u4e3a\u5176\u4e2d\u7684\u4e00\u90e8\u5206\uff0c\u4ed6\u4eec\u91c7\u7528\u4e86\u4ea8\u5229\u00b7\u798f\u7279\u7684\u65b9\u6cd5\u6765\u9009\u62e9\u52a0\u5bc6\u7b97\u6cd5\u3002<\/span>\u4f60\u53ef\u4ee5\u62e5\u6709\u4efb\u4f55\u4f60\u559c\u6b22\u7684\u7b97\u6cd5\uff0c\u53ea\u8981\u4f60\u559c\u6b22 AES-GCM \u6216 ChaCha20\/Poly1305\u3002DCO\u4e0d\u652f\u6301\u538b\u7f29\u3001\u7b2c 2 \u5c42\u6d41\u91cf\u3001\u975e\u5b50\u7f51\u62d3\u6251\u6216\u6d41\u91cf\u6574\u5f62<\/span>\u3002<\/span><\/p>\n

\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cDCO\u4e0d\u4f1a\u66f4\u6539OpenVPN\u534f\u8bae\u3002\u5ba2\u6237\u7aef\u53ef\u4ee5\u5c06\u5b83\u4e0e\u4e0d\u4f7f\u7528\u5b83\u7684\u670d\u52a1\u5668\u4e00\u8d77\u4f7f\u7528\uff0c\u53cd\u4e4b\u4ea6\u7136\u3002\u5f53\u7136\uff0c\u5f53\u53cc\u65b9\u90fd\u4f7f\u7528\u5b83\u65f6\uff0c\u5c06\u83b7\u5f97\u6700\u5927\u7684\u597d\u5904\uff0c\u4f46\u8fd9\u4e0d\u662f\u5fc5\u9700\u7684\u3002<\/span><\/p>\n

\u6ce8\u610f\u4e8b\u9879<\/span><\/h1>\n

\u5728\u8fd9\u4e00\u90e8\u5206\uff0c\u6211\u4f1a\u8c08\u8bba\u8fd9\u4e00\u5207\u6709\u591a\u4e48\u56f0\u96be\uff0c\u6240\u4ee5\u4f60\u4eec\u90fd\u4f1a\u5bf9\u6211\u771f\u6b63\u505a\u5230\u4e86\u8fd9\u4e00\u70b9\u5370\u8c61\u6df1\u523b\u3002\u4f46<\/span>\u6709\u51e0\u4ef6\u4e8b\u9700\u8981\u7279\u522b\u6ce8\u610f\uff1a<\/span><\/p>\n

\u591a\u8def\u590d\u7528<\/span><\/h2>\n

\u7b2c\u4e00\u4e2a\u95ee\u9898\u662fOpenVPN\u4f7f\u7528\u5355\u4e2a\u8fde\u63a5\u6765\u4f20\u8f93\u96a7\u9053\u6570\u636e\u548c\u63a7\u5236\u6570\u636e\u3002\u96a7\u9053\u6570\u636e\u9700\u8981\u7531\u5185\u6838\u5904\u7406\uff0c\u63a7\u5236\u6570\u636e\u7531OpenVPN\u7528\u6237\u7a7a\u95f4\u8fdb\u7a0b\u5904\u7406\u3002<\/span><\/p>\n

\u4f60\u53ef\u4ee5\u770b\u5230\u8fd9\u4e2a\u95ee\u9898\u3002\u8be5\u5957\u63a5\u5b57\u6700\u521d\u7531 OpenVPN \u672c\u8eab\u5f00\u653e\u5e76\u5b8c\u5168\u62e5\u6709\u3002\u5b83\u8bbe\u7f6e\u96a7\u9053\u5e76\u5904\u7406\u8eab\u4efd\u9a8c\u8bc1\u3002\u4e00\u65e6\u5b8c\u6210\uff0c\u5b83\u4f1a\u5c06\u90e8\u5206\u63a7\u5236\u6743\u79fb\u4ea4\u7ed9\u5185\u6838\u7aef\uff08\u5373 if_ovpn\uff09\u3002<\/span><\/p>\n

\u8fd9\u610f\u5473\u7740\u901a\u77e5 if_ovpn \u6587\u4ef6\u63cf\u8ff0\u7b26\uff08\u5185\u6838\u4f7f\u7528\u5b83\u6765\u67e5\u627e\u5185\u6838\u7ed3\u6784\u5957\u63a5\u5b57\uff09\uff0c\u4ee5\u4fbf\u5b83\u53ef\u4ee5\u4fdd\u5b58\u5bf9\u5176\u7684\u5f15\u7528\u3002\u8fd9\u53ef\u4ee5\u786e\u4fdd\u5957\u63a5\u5b57\u5728\u5185\u6838\u4f7f\u7528\u5b83\u65f6\u4e0d\u4f1a\u6d88\u5931\u3002<\/span>\u4e5f\u8bb8\u662f\u56e0\u4e3a OpenVPN \u8fdb\u7a0b\u88ab\u7ec8\u6b62\u4e86\uff0c\u6216\u8005\u56e0\u4e3a\u5b83\u4eca\u5929\u5fc3\u60c5\u4e0d\u597d\u800c\u51b3\u5b9a\u6765\u60f9\u6211\u4eec\u3002\u5b83\u662f\u7528\u6237\u7a7a\u95f4\uff0c\u5b83\u53ef\u80fd\u4f1a\u505a\u4e00\u4e9b\u75af\u72c2\u7684\u4e8b\u60c5\u3002<\/span><\/p>\n

\u5bf9\u4e8e\u90a3\u4e9b\u60f3\u8981\u4e86\u89e3\u5185\u6838\u4ee3\u7801\u7684\u4eba\u6765\u8bf4\uff0c\u53ef\u4ee5\u5bfb\u627e<\/span>ovpn_new_peer()<\/code>\u51fd\u6570\u3002<\/span>\u67e5\u627e\u5957\u63a5\u5b57\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5b89\u88c5\u8fc7\u6ee4\u529f\u80fd<\/span>udp_set_kernel_tunneling()<\/code>\u3002\u8fc7\u6ee4\u5668<\/span>ovpn_udp_input()<\/code>\u67e5\u770b\u6307\u5b9a\u5957\u63a5\u5b57\u7684\u6240\u6709\u4f20\u5165\u6570\u636e\u5305\uff0c\u5e76\u51b3\u5b9a\u5b83\u662f\u5e94\u5904\u7406\u7684\u6709\u6548\u8d1f\u8f7d\u6570\u636e\u5305\uff0c\u8fd8\u662f\u7528\u6237\u7a7a\u95f4\u4e2d\u7684 OpenVPN \u5e94\u5904\u7406\u7684\u63a7\u5236\u6570\u636e\u5305\u3002<\/span><\/p>\n

\u8fd9\u4e2a\u96a7\u9053\u529f\u80fd\u4e5f\u662f\u6211\u5fc5\u987b\u5bf9\u7f51\u7edc\u5806\u6808\u7684\u5176\u4f59\u90e8\u5206\u8fdb\u884c\u7684\u552f\u4e00\u66f4\u6539\u3002\u9700\u8981\u544a\u77e5\u67d0\u4e9b\u6570\u636e\u5305\u5c06\u7531\u5185\u6838\u5904\u7406\uff0c\u800c\u5176\u4ed6\u6570\u636e\u5305\u4ecd\u7136\u53ef\u4ee5\u4f20\u9012\u5230\u7528\u6237\u7a7a\u95f4\u3002<\/span><\/p>\n

\u8be5ovpn_udp_input()<\/code>\u51fd\u6570\u662f\u63a5\u6536\u8def\u5f84\u7684\u4e3b\u8981\u5165\u53e3\u70b9\u3002\u5bf9\u4e8e\u5230\u8fbe\u5176\u6240\u5b89\u88c5\u7684\u5957\u63a5\u5b57\u7684\u4efb\u4f55 UDP \u6570\u636e\u5305\uff0c\u7f51\u7edc\u5806\u6808\u5c06\u6570\u636e\u5305\u79fb\u4ea4\u7ed9\u6b64\u51fd\u6570\u3002<\/p>\n

\u8be5\u51fd\u6570\u9996\u5148\u68c0\u67e5\u5185\u6838\u9a71\u52a8\u7a0b\u5e8f\u662f\u5426\u53ef\u4ee5\u5904\u7406\u6570\u636e\u5305\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u8be5\u6570\u636e\u5305\u662f\u4e00\u4e2a\u6570\u636e\u5305\uff0c\u5176\u76ee\u7684\u5730\u662f\u5df2\u77e5\u7684\u5bf9\u7b49\u70b9 ID\u3002\u5982\u679c\u4e0d\u662f\u8fd9\u79cd\u60c5\u51b5\uff0c\u8fc7\u6ee4\u5668\u51fd\u6570\u4f1a\u544a\u8bc9 UDP \u4ee3\u7801\u901a\u8fc7\u6b63\u5e38\u6d41\u4f20\u9012\u6570\u636e\u5305\uff0c\u5c31\u597d\u50cf\u6ca1\u6709\u8fc7\u6ee4\u5668\u529f\u80fd\u4e00\u6837\u3002\u8fd9\u610f\u5473\u7740\u6570\u636e\u5305\u5c06\u5230\u8fbe\u5957\u63a5\u5b57\u5e76\u7531 OpenVPN \u7684\u7528\u6237\u7a7a\u95f4\u8fdb\u7a0b\u8fdb\u884c\u5904\u7406\u3002<\/span><\/p>\n

\u65e9\u671f\u7248\u672c\u7684 DCO \u9a71\u52a8\u7a0b\u5e8f\u5177\u6709\u5355\u72ec\u7684 ioctl \u547d\u4ee4\u6765\u8bfb\u53d6\u548c\u5199\u5165\u63a7\u5236\u6d88\u606f\uff0c\u4f46 Linux \u548c FreeBSD \u9a71\u52a8\u7a0b\u5e8f\u90fd\u5df2\u6539\u4e3a\u4f7f\u7528\u5957\u63a5\u5b57\u3002\u8fd9\u7b80\u5316\u4e86\u63a7\u5236\u6570\u636e\u5305\u548c\u65b0\u5ba2\u6237\u7aef\u7684\u5904\u7406\u3002<\/span><\/p>\n

\u53e6\u4e00\u65b9\u9762\uff0c\u5982\u679c\u6570\u636e\u5305\u662f\u5df2\u77e5\u5bf9\u7b49\u70b9\u7684\u6570\u636e\u5305\uff0c\u5219\u5c06\u5176\u89e3\u5bc6\uff0c\u9a8c\u8bc1\u5176\u7b7e\u540d\uff0c\u7136\u540e\u5c06\u5176\u4f20\u9012\u5230\u7f51\u7edc\u5806\u6808\u4ee5\u8fdb\u884c\u8fdb\u4e00\u6b65\u5904\u7406\u3002<\/p>\n

UDP\u534f\u8bae<\/span><\/h2>\n

OpenVPN \u53ef\u4ee5\u5728 UDP \u548c TCP \u4e0a\u8fd0\u884c\u3002\u867d\u7136 UDP \u662f\u7b2c 3 \u5c42 VPN \u534f\u8bae\u7684\u4f18\u5148\u9009\u62e9\uff0c\u4f46\u4e00\u4e9b\u7528\u6237\u9700\u8981\u901a\u8fc7 TCP \u8fd0\u884c\u5b83\u6765\u7a7f\u8d8a\u9632\u706b\u5899\u3002<\/p>\n

FreeBSD \u5185\u6838\u4e3a UDP \u5957\u63a5\u5b57\u63d0\u4f9b\u4e86\u65b9\u4fbf\u7684\u8fc7\u6ee4\u529f\u80fd\uff0c\u4f46\u6ca1\u6709\u5bf9\u5e94\u4e8e TCP \u7684\u8fc7\u6ee4\u529f\u80fd\uff0c\u56e0\u6b64 FreeBSD if_ovpn \u76ee\u524d\u4ec5\u652f\u6301 UDP\uff0c\u800c\u4e0d\u652f\u6301 TCP\u3002Linux DCO \u9a71\u52a8\u7a0b\u5e8f\u5df2\u7ecf\u5b9e\u73b0\u5bf9 TCP \u652f\u6301\u3002<\/p>\n

\u786c\u4ef6\u52a0\u5bc6\u5378\u8f7d<\/h2>\n

if_ovpn \u4f9d\u8d56\u4e8e\u5185\u6838\u4e2d\u7684 OpenCrypto \u6846\u67b6\u8fdb\u884c\u52a0\u5bc6\u64cd\u4f5c\u3002\u8fd9\u610f\u5473\u7740\u5b83\u8fd8\u53ef\u4ee5\u5229\u7528\u7cfb\u7edf\u4e2d\u5b58\u5728\u7684\u4efb\u4f55\u52a0\u5bc6\u5378\u8f7d\u786c\u4ef6\u3002\u8fd9\u53ef\u4ee5\u8fdb\u4e00\u6b65\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n

\u5b83\u5df2\u7ecf\u901a\u8fc7\u82f1\u7279\u5c14 QuickAssist \u6280\u672f (QAT)\u3001SafeXcel EIP-97 \u52a0\u5bc6\u52a0\u901f\u5668\u548c AES-NI \u7684\u6d4b\u8bd5\u3002<\/p>\n

\u9501\u5b9a\u8bbe\u8ba1<\/h2>\n

\u51e0\u4e4e\u6bcf\u4e2a\u73b0\u4ee3 CPU \u90fd\u6709\u591a\u4e2a\u5185\u6838\uff0c\u5982\u679c\u80fd\u591f\u4f7f\u7528\u591a\u4e2a\u5185\u6838\uff0c\u5bf9\u6027\u80fd\u7684\u63d0\u5347\u5c06\u4f1a\u975e\u5e38\u663e\u8457\uff0c\u4e8b\u5b9e\u8bc1\u660e\u8fd9\u76f8\u5f53\u5bb9\u6613\u505a\u5230\u3002\u6574\u4e2a\u65b9\u6cd5\u57fa\u4e8e\u533a\u5206\u5bf9 if_ovpn \u5185\u90e8\u6570\u636e\u7ed3\u6784\u7684\u8bfb\u53d6\u548c\u5199\u5165\u8bbf\u95ee\u3002\u5141\u8bb8\u4e0d\u540c\u7684\u6838\u5fc3\u540c\u65f6\u67e5\u627e\u5185\u5bb9\uff0c\u4f46\u53ea\u5141\u8bb8\u4e00\u4e2a\u6838\u5fc3\u66f4\u6539\u5185\u5bb9\uff08\u7136\u540e\u5728\u8fdb\u884c\u66f4\u6539\u65f6\u4e0d\u5141\u8bb8\u4efb\u4f55\u8bfb\u8005\uff09\u3002\u4e8b\u5b9e\u8bc1\u660e\u8fd9\u79cd\u65b9\u6cd5\u6548\u679c\u5f88\u597d\uff0c\u56e0\u4e3a\u5927\u591a\u6570\u65f6\u5019\u6211\u4eec\u4e0d\u9700\u8981\u6539\u53d8\u4e8b\u60c5\u3002<\/p>\n

\u5e38\u89c1\u7684\u60c5\u51b5\u662f\uff0c\u5f53\u6211\u4eec\u63a5\u6536\u6216\u53d1\u9001\u6570\u636e\u5305\u65f6\uff0c\u53ea\u9700\u8981\u67e5\u627e\u5bc6\u94a5\u3001\u76ee\u6807\u5730\u5740\u548c\u7aef\u53e3\u7b49\u76f8\u5173\u4fe1\u606f\u3002<\/p>\n

\u53ea\u6709\u5f53\u6211\u4eec\u4fee\u6539\u5185\u5bb9\uff08\u5373\u914d\u7f6e\u66f4\u6539\u6216\u91cd\u65b0\u8f93\u5165\u5bc6\u94a5\uff09\u65f6\uff0c\u6211\u4eec\u624d\u9700\u8981\u83b7\u53d6\u5199\u9501\uff0c\u5e76\u4e14\u6682\u505c\u6570\u636e\u901a\u9053\u3002\u8fd9\u8db3\u591f\u7b80\u77ed\uff0c\u6211\u4eec\u5f31\u5c0f\u7684\u4eba\u7c7b\u5927\u8111\u4e0d\u4f1a\u6ce8\u610f\u5230\u5b83\uff0c\u8fd9\u8ba9\u6bcf\u4e2a\u4eba\u90fd\u5f88\u9ad8\u5174\u3002<\/span><\/p>\n

\u201c\u6211\u4eec\u4e0d\u4f1a\u66f4\u6539\u8fc7\u7a0b\u6570\u636e\u201d\u8fd9\u4e00\u89c4\u5219\u6709\u4e00\u4e2a\u4f8b\u5916\uff0c\u90a3\u5c31\u662f\u6570\u636e\u5305\u8ba1\u6570\u5668\u3002\u6bcf\u4e2a\u6570\u636e\u5305\u90fd\u4f1a\u88ab\u8ba1\u6570\uff08\u751a\u81f3\u4e24\u6b21\uff0c\u4e00\u6b21\u7528\u4e8e\u6570\u636e\u5305\u8ba1\u6570\uff0c\u4e00\u6b21\u7528\u4e8e\u5b57\u8282\u8ba1\u6570\uff09\uff0c\u5e76\u4e14\u5fc5\u987b\u540c\u65f6\u5b8c\u6210\u3002\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u4e5f\u5f88\u5e78\u8fd0\uff0c\u56e0\u4e3a\u5185\u6838\u7684<\/span>counter(9)<\/code>\u6846\u67b6\u6b63\u662f\u9488\u5bf9\u8fd9\u79cd\u60c5\u51b5\u800c\u8bbe\u8ba1\u7684\u3002\u5b83\u4fdd\u7559\u6bcf\u4e2a CPU \u6838\u5fc3\u7684\u603b\u6570\uff0c\u4ee5\u4fbf\u4e00\u4e2a\u6838\u5fc3\u4e0d\u4f1a\u5f71\u54cd\u6216\u51cf\u6162\u53e6\u4e00\u4e2a\u6838\u5fc3\u7684\u901f\u5ea6\u3002\u53ea\u6709\u5f53\u5b9e\u9645\u8bfb\u53d6\u8ba1\u6570\u5668\u65f6\uff0c\u5b83\u624d\u4f1a\u5411\u6bcf\u4e2a\u6838\u5fc3\u8be2\u95ee\u5176\u603b\u6570\u5e76\u5c06\u5176\u76f8\u52a0\u3002<\/span><\/p>\n

\u63a7\u5236\u63a5\u53e3<\/span><\/h2>\n

\u6bcf\u4e2a OpenVPN DCO \u5e73\u53f0\u90fd\u6709\u81ea\u5df1\u72ec\u7279\u7684\u7528\u6237\u7a7a\u95f4 OpenVPN \u548c\u5185\u6838\u6a21\u5757\u4e4b\u95f4\u901a\u4fe1\u7684\u65b9\u5f0f\u3002<\/span>\u5728 Linux \u4e0a\uff0c\u8fd9\u662f\u901a\u8fc7 netlink \u5b8c\u6210\u7684\uff0c\u4f46 if_ovpn \u5de5\u4f5c\u662f\u5728 FreeBSD \u7684 netlink \u5b9e\u73b0\u51c6\u5907\u597d\u4e4b\u524d\u5b8c\u6210\u7684\u3002<\/span><\/p>\n

if_ovpn \u9a71\u52a8\u7a0b\u5e8f\u662f\u901a\u8fc7\u73b0\u6709\u63a5\u53e3ioctl \u8def\u5f84\u914d\u7f6e\u7684\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u5c31\u662fSIOCSDRVSPEC\/SIOCGDRVSPEC<\/code>\u8c03\u7528\u3002\u8fd9\u4e9b\u8c03\u7528\u5c06struct ifdrv \u4f20\u9012\u7ed9\u5185\u6838\u3002ifd_cmd \u5b57\u6bb5\u7528\u4e8e\u4f20\u9012\u547d\u4ee4\uff0cifd_data \u548c ifd_len \u5b57\u6bb5\u7528\u4e8e\u5728\u5185\u6838\u548c\u7528\u6237\u7a7a\u95f4\u4e4b\u95f4\u4f20\u9012\u8bbe\u5907\u7279\u5b9a\u7684\u7ed3\u6784\u3002<\/p>\n

if_ovpn \u4e0e\u65e2\u5b9a\u65b9\u6cd5\u6709\u6240\u4e0d\u540c\uff0c\u56e0\u4e3a\u5b83\u4f20\u8f93\u5e8f\u5217\u5316\u7684 nvlist \u800c\u4e0d\u662f\u7ed3\u6784\u3002\u8fd9\u4f7f\u5f97\u6269\u5c55\u63a5\u53e3\u53d8\u5f97\u66f4\u52a0\u5bb9\u6613\u3002\u6216\u8005\uff0c\u66f4\u786e\u5207\u5730\u8bf4\uff0c\u8fd9\u610f\u5473\u7740\u6211\u4eec\u53ef\u4ee5\u5728\u4e0d\u7834\u574f\u73b0\u6709\u7528\u6237\u7a7a\u95f4\u6d88\u8d39\u8005\u7684\u60c5\u51b5\u4e0b\u6269\u5c55\u63a5\u53e3\u3002\u5982\u679c\u5c06\u65b0\u5b57\u6bb5\u6dfb\u52a0\u5230\u7ed3\u6784\u4e2d\uff0c\u5176\u5e03\u5c40\u4f1a\u53d1\u751f\u53d8\u5316\uff0c\u8fd9\u610f\u5473\u7740\u73b0\u6709\u4ee3\u7801\u5c06\u7531\u4e8e\u5176\u5927\u5c0f\u4e0d\u5339\u914d\u800c\u62d2\u7edd\u63a5\u53d7\u5b837<\/sub><\/a>\u6216\u53d8\u5f97\u975e\u5e38\u56f0\u60d1\uff0c\u56e0\u4e3a\u5b57\u6bb5\u4e0d\u518d\u5177\u6709\u5b83\u4eec\u4ee5\u524d\u7684\u542b\u4e49\u3002<\/p>\n

\u5e8f\u5217\u5316\u7684 nvlist \u5141\u8bb8\u6211\u4eec\u6dfb\u52a0\u5b57\u6bb5\uff0c\u800c\u4e0d\u4f1a\u6df7\u6dc6\u53e6\u4e00\u65b9\u3002\u4efb\u4f55\u672a\u77e5\u5b57\u6bb5\u90fd\u5c06\u88ab\u5ffd\u7565\u3002\u8fd9\u4f7f\u5f97\u6dfb\u52a0\u65b0\u529f\u80fd\u53d8\u5f97\u66f4\u52a0\u5bb9\u6613\u3002<\/p>\n

\u8def\u7531\u67e5\u627e<\/h2>\n

\u60a8\u53ef\u80fd\u8ba4\u4e3a if_ovpn \u4e0d\u9700\u8981\u62c5\u5fc3\u8def\u7531\u51b3\u7b56\u3002\u6bd5\u7adf\uff0c\u5f53\u6570\u636e\u5305\u5230\u8fbe\u7f51\u7edc\u9a71\u52a8\u7a0b\u5e8f\u65f6\uff0c\u5185\u6838\u7684\u7f51\u7edc\u5806\u6808\u5df2\u7ecf\u505a\u51fa\u4e86\u8def\u7531\u51b3\u7b56\u3002\u4f60\u5c31\u9519\u4e86\u3002\u6211\u4f1a\u4e3a\u6b64\u53d6\u7b11\u4f60\uff0c\u4f46\u6211\u4e5f\u82b1\u4e86\u4e00\u6bb5\u65f6\u95f4\u624d\u5f04\u6e05\u695a\u3002<\/p>\n

\u95ee\u9898\u662f\u7ed9\u5b9a\u7684 if_ovpn \u63a5\u53e3\u4e0a\u53ef\u80fd\u5b58\u5728\u591a\u4e2a\u5bf9\u7b49\u70b9\uff08\u4f8b\u5982\uff0c\u5f53\u5b83\u5145\u5f53\u670d\u52a1\u5668\u5e76\u5177\u6709\u591a\u4e2a\u5ba2\u6237\u7aef\u65f6\uff09\u3002\u5185\u6838\u5df2\u7ecf\u53d1\u73b0\u6709\u95ee\u9898\u7684\u6570\u636e\u5305\u9700\u8981\u53d1\u9001\u5230\u5176\u4e2d\u4e00\u4e2a\uff0c\u4f46\u5185\u6838\u7684\u8fd0\u884c\u5047\u8bbe\u6240\u6709\u8fd9\u4e9b\u5ba2\u6237\u7aef\u90fd\u4f4d\u4e8e\u5355\u4e2a\u5e7f\u64ad\u57df\u4e0a\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5728\u63a5\u53e3\u4e0a\u53d1\u9001\u7684\u6570\u636e\u5305\u5bf9\u6240\u6709\u4eba\u6765\u8bf4\u90fd\u662f\u53ef\u89c1\u7684\u3002\u8fd9\u91cc\u7684\u60c5\u51b5\u5e76\u975e\u5982\u6b64\uff0c\u56e0\u6b64 if_ovpn \u9700\u8981\u8ba1\u7b97\u51fa\u6570\u636e\u5305\u5fc5\u987b\u53d1\u9001\u5230\u54ea\u4e2a\u5ba2\u6237\u7aef\u3002<\/span><\/p>\n

\u8fd9\u662f\u7531 \u5904\u7406\u7684<\/span>ovpn_route_peer()<\/code>\u3002\u8be5\u51fd\u6570\u9996\u5148\u67e5\u770b\u5bf9\u7b49\u70b9\u5217\u8868\uff0c\u67e5\u770b\u662f\u5426\u6709\u4efb\u4f55\u5bf9\u7b49\u70b9\u7684 VPN \u5730\u5740\u4e0e\u76ee\u6807\u5730\u5740\u5339\u914d\u3002\uff08\u7531<\/span>ovpn_find_peer_by_ip()<\/code>\u6216\u5b8c\u6210<\/span>ovpn_find_peer_by_ip6()<\/code>\uff0c\u5177\u4f53\u53d6\u51b3\u4e8e\u5730\u5740\u65cf\uff09\u3002\u5982\u679c\u627e\u5230\u5339\u914d\u7684\u5bf9\u7b49\u70b9\uff0c\u5219\u6570\u636e\u5305\u5c06\u53d1\u9001\u5230\u8be5\u5bf9\u7b49\u70b9\u3002\u5982\u679c\u6ca1\u6709\uff0c<\/span>ovpn_route_peer()<\/code>\u5219\u6267\u884c\u8def\u7531\u67e5\u627e\uff0c\u5e76\u4f7f\u7528\u751f\u6210\u7684\u7f51\u5173\u5730\u5740\u91cd\u590d\u5bf9\u7b49\u67e5\u627e\u3002<\/span>\u53ea\u6709\u5f53 if_ovpn \u627e\u5230\u5c06\u6570\u636e\u5305\u53d1\u9001\u5230\u7684\u5bf9\u7b49\u65b9\u65f6\uff0c\u6570\u636e\u5305\u624d\u80fd\u88ab\u52a0\u5bc6\u548c\u4f20\u8f93\u3002<\/p>\n

\u5bc6\u94a5\u8f6e\u6362<\/h2>\n

OpenVPN \u4f1a\u4e0d\u65f6\u66f4\u6539\u7528\u4e8e\u4fdd\u62a4\u96a7\u9053\u5b89\u5168\u7684\u5bc6\u94a5\u3002\u8fd9\u662f if_ovpn \u7559\u7ed9\u7528\u6237\u7a7a\u95f4\u7684\u8270\u5de8\u5de5\u4f5c\u4e4b\u4e00\uff0c\u56e0\u6b64 OpenVPN \u548c if_ovpn \u4e4b\u95f4\u9700\u8981\u8fdb\u884c\u4e00\u4e9b\u534f\u8c03\u3002<\/p>\n

OpenVPN \u5c06\u4f7f\u7528 OVPN_NEW_KEY \u547d\u4ee4\u5b89\u88c5\u65b0\u5bc6\u94a5\u3002\u6bcf\u4e2a\u5bc6\u94a5\u90fd\u6709\u4e00\u4e2a ID\uff0c\u6bcf\u4e2a\u6570\u636e\u5305\u90fd\u5305\u542b\u7528\u4e8e\u52a0\u5bc6\u5b83\u7684\u5bc6\u94a5 ID\u3002\u8fd9\u610f\u5473\u7740\u5728\u5bc6\u94a5\u8f6e\u6362\u671f\u95f4\uff0c\u6240\u6709\u6570\u636e\u5305\u4ecd\u7136\u53ef\u4ee5\u88ab\u89e3\u5bc6\uff0c\u56e0\u4e3a\u65e7\u5bc6\u94a5\u548c\u65b0\u5bc6\u94a5\u90fd\u662f\u5df2\u77e5\u7684\u5e76\u4e14\u5728\u5185\u6838\u4e2d\u4fdd\u6301\u6d3b\u52a8\u72b6\u6001\u3002<\/p>\n

\u5b89\u88c5\u65b0\u5bc6\u94a5\u540e\uff0c\u53ef\u4ee5\u4f7f\u7528 OVPN_SWAP_KEYS \u547d\u4ee4\u5c06\u5176\u6fc0\u6d3b\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u65b0\u5bc6\u94a5\u5c06\u7528\u4e8e\u52a0\u5bc6\u4f20\u51fa\u6570\u636e\u5305\u3002\u7a0d\u540e\u53ef\u4ee5\u4f7f\u7528 OVPN_DEL_KEY \u547d\u4ee4\u5220\u9664\u65e7\u5bc6\u94a5\u3002<\/p>\n

\u865a\u62df\u7f51\u7edc<\/h2>\n

\u662f\u7684\uff0c\u6211\u4eec\u5c06\u4e0d\u5f97\u4e0d\u8c08\u8bba vnet\u3002\u5c06 vnet \u89c6\u4e3a\u5c06\u76d1\u72f1\u8f6c\u53d8\u4e3a\u5177\u6709\u81ea\u5df1\u7684 IP \u5806\u6808\u7684\u865a\u62df\u673a\u3002\u8fd9\u5bf9\u4e8e pfSense \u7528\u4f8b\u6765\u8bf4\u5e76\u4e0d\u662f\u4e25\u683c\u8981\u6c42\u7684\uff0c\u4f46\u5b83\u4f7f\u6d4b\u8bd5\u53d8\u5f97\u975e\u5e38\u975e\u5e38\u5bb9\u6613\u3002\u8fd9\u610f\u5473\u7740\u6211\u4eec\u53ef\u4ee5\u5728\u4e00\u53f0\u673a\u5668\u4e0a\u8fdb\u884c\u6d4b\u8bd5\uff0c\u800c\u4e0d\u9700\u8981\u4efb\u4f55\u5916\u90e8\u5de5\u5177\uff08\u9664\u4e86 OpenVPN \u672c\u8eab\uff0c\u539f\u56e0\u5e94\u8be5\u662f\u975e\u5e38\u660e\u663e\u7684\uff09\u3002<\/p>\n

\u6d4b\u8bd5\u8868\u73b0<\/h1>\n

\u5728Netgate 4100\u8bbe\u5907\u4e0a\uff0c\u901a\u8fc7\u8fd0\u884ciperf3\u8fdb\u884c\u6d4b\u8bd5\uff0c\u5f97\u5230\u4e86\u4ee5\u4e0b\u7ed3\u679c\uff1a<\/p>\n\n\n\n\n\n\n
if_tun<\/td>\n207.3 Mbit\/s<\/td>\n<\/tr>\n
DCO Software<\/td>\n213.1 Mbit\/s<\/td>\n<\/tr>\n
DCO AES-NI<\/td>\n751.2 Mbit\/s<\/td>\n<\/tr>\n
DCO QAT<\/td>\n1,064.8 Mbit\/s<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u201cif_tun\u201d\u662f\u6ca1\u6709 DCO \u7684\u65e7 OpenVPN \u65b9\u6cd5\u3002\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0c\u5b83\u5728\u7528\u6237\u7a7a\u95f4\u4e2d\u4f7f\u7528\u4e86 AES-NI \u6307\u4ee4\uff0c\u800c\u201cDCO \u8f6f\u4ef6\u201d\u8bbe\u7f6e\u5219\u6ca1\u6709\u3002\u5c3d\u7ba1\u5b58\u5728\u8fd9\u79cd\u516c\u7136\u7684\u4f5c\u5f0a\u884c\u4e3a\uff0cDCO \u7684\u901f\u5ea6\u4ecd\u7136\u7a0d\u5feb\u4e00\u4e9b\u3002<\/span><\/p>\n

\u5728\u516c\u5e73\u7684\u7ade\u4e89\u73af\u5883\u4e2d\uff08\u5373DCO \u786e\u5b9e\u4f7f\u7528 AES-NI \u6307\u4ee4\uff09\uff0c\u4e0d\u5b58\u5728\u7ade\u4e89\u3002DCO \u7684\u901f\u5ea6\u5feb\u4e86\u4e09\u500d\u591a\u3002<\/p>\n

\u5bf9\u4e8e\u82f1\u7279\u5c14\u6765\u8bf4\uff0cQuickAssist \u5378\u8f7d\u5f15\u64ce\u751a\u81f3\u6bd4 AES-NI \u8fd8\u8981\u5feb\uff0c\u4f7f OpenVPN \u7684\u901f\u5ea6\u6bd4\u4ee5\u524d\u5feb\u4e94\u500d\u3002<\/p>\n

\u672a\u6765\u7684\u5de5\u4f5c<\/h1>\n

\u6ca1\u6709\u4ec0\u4e48\u662f\u4e0d\u80fd\u6539\u8fdb\u7684\uff0c\u4f46\u4ece\u67d0\u4e9b\u65b9\u9762\u6765\u8bf4\uff0c\u4e0b\u4e00\u4e2a\u589e\u5f3a\u662f DCO \u8bbe\u8ba1\u6210\u529f\u7684\u7ed3\u679c\u3002\u5728\u7ebf OpenVPN \u534f\u8bae\u4f7f\u7528 32 \u4f4d\u521d\u59cb\u5316\u5411\u91cf (IV)\uff0c\u51fa\u4e8e\u52a0\u5bc6\u539f\u56e0\uff0c\u4f7f\u7528\u76f8\u540c\u5bc6\u94a5\u91cd\u590d\u4f7f\u7528 IV \u662f\u4e00\u4e2a\u574f\u4e3b\u610f\u3002<\/p>\n

\u8fd9\u610f\u5473\u7740\u5728\u6211\u4eec\u8fbe\u5230\u8fd9\u4e00\u70b9\u4e4b\u524d\u5fc5\u987b\u91cd\u65b0\u534f\u5546\u5bc6\u94a5\u3002OpenVPN \u7684\u9ed8\u8ba4\u91cd\u65b0\u534f\u5546\u95f4\u9694\u4e3a 3600 \u79d2\uff0c\u5e76\u6709 30% \u7684\u5b89\u5168\u5bcc\u88d5\uff0c\u8fd9\u5c06\u8f6c\u6362\u4e3a 2^32 * 0.7 \/ 3600\uff0c\u5373\u6bcf\u79d2\u7ea6 835.000 \u4e2a\u6570\u636e\u5305\u3002\u8fd9\u5c06\u8fbe\u52308 \u5230 9 Gbit\/s\uff08\u5047\u8bbe\u6570\u636e\u5305\u4e3a 1300 \u5b57\u8282\uff09\u3002<\/p>\n

\u6709\u4e86 DCO\uff0c\u73b0\u4ee3\u786c\u4ef6\u6216\u591a\u6216\u5c11\u5df2\u7ecf\u53ef\u4ee5\u505a\u5230\u8fd9\u4e00\u70b9\u3002\u867d\u7136\u8fd9\u662f\u4e00\u4e2a\u597d\u95ee\u9898\uff0c\u4f46\u5b83\u4ecd\u7136\u662f\u4e00\u4e2a\u95ee\u9898\uff0c\u56e0\u6b64 OpenVPN \u5f00\u53d1\u4eba\u5458\u6b63\u5728\u5f00\u53d1\u4e00\u79cd\u66f4\u65b0\u7684\u6570\u636e\u5305\u683c\u5f0f\uff0c\u8be5\u683c\u5f0f\u5c06\u4f7f\u7528 64 \u4f4d IV\u3002<\/p>\n

\u5176\u4ed6\u8bf4\u660e<\/h1>\n

if_ovpn \u5de5\u4f5c\u7531 Rubicon Communications\uff08\u4ee5 Netgate \u540d\u4e49\u4ea4\u6613\uff09\u8d5e\u52a9\uff0c\u7528\u4e8e\u5176 pfSense \u4ea7\u54c1\u7ebf\u3002pfSense plus 22.05\u4e2d\u5f00\u59cb\u63d0\u4f9bOpenVPN DCO\u529f\u80fd\uff0c\u8fd9\u9879\u5de5\u4f5c\u5df2\u4e0a\u6e38\u5230 FreeBSD\uff0c\u5e76\u4e14\u662f\u6700\u8fd1 14.0 \u7248\u672c\u7684\u4e00\u90e8\u5206\u3002\u5b83\u9700\u8981 OpenVPN 2.6.0 \u6216\u66f4\u9ad8\u7248\u672c\u624d\u80fd\u4f7f\u7528\u3002\u5f88\u53ef\u60dc\u7684\u662f\uff0cNetgate\u5e76\u672a\u5728pfSense CE\u4e2d\u63d0\u4f9b\u8be5\u529f\u80fd\u3002<\/p>\n

\u76f8\u5173\u6587\u7ae0\uff1a<\/p>\n