{"id":21613,"date":"2024-11-15T14:09:32","date_gmt":"2024-11-15T06:09:32","guid":{"rendered":"https:\/\/www.yunshan.net\/blog\/?p=21613"},"modified":"2024-11-15T14:09:32","modified_gmt":"2024-11-15T06:09:32","slug":"%e4%ba%86%e8%a7%a3ebpf%ef%bc%9a%e5%a6%82%e4%bd%95%e5%a2%9e%e5%bc%ba%e7%b3%bb%e7%bb%9f%e5%ae%89%e5%85%a8%e6%80%a7%e4%b8%8e%e7%a8%b3%e5%ae%9a%e6%80%a7","status":"publish","type":"post","link":"https:\/\/www.yunshan.net\/blog\/archives\/21613.html","title":{"rendered":"\u4e86\u89e3eBPF\uff1a\u5982\u4f55\u589e\u5f3a\u7cfb\u7edf\u5b89\u5168\u6027\u4e0e\u7a33\u5b9a\u6027"},"content":{"rendered":"

\t\t\t\teBPF<\/a>\uff08Extended Berkeley Packet Filter\uff09\u662f\u4e00\u79cd\u5f3a\u5927\u7684\u6280\u672f\uff0c\u6700\u521d\u7528\u4e8e\u7f51\u7edc\u5305\u8fc7\u6ee4\uff0c\u4f46\u73b0\u5728\u5df2\u7ecf\u6269\u5c55\u5230\u8bb8\u591a\u5176\u4ed6\u9886\u57df\uff0c\u5305\u62ec\u7cfb\u7edf\u5b89\u5168\u6027\u548c\u7a33\u5b9a\u6027\u3002\u672c\u6587\u5c06\u6df1\u5165\u63a2\u8ba8eBPF<\/a>\u7684\u5de5\u4f5c\u539f\u7406\u3001\u5e94\u7528\u573a\u666f\u4ee5\u53ca\u5982\u4f55\u5229\u7528eBPF\u6280\u672f\u6765\u589e\u5f3a\u7cfb\u7edf\u7684\u5b89\u5168\u6027\u4e0e\u7a33\u5b9a\u6027\u3002<\/p>\n\n\n\n\n

eBPF\u7684\u57fa\u672c\u6982\u5ff5<\/h3>\n\n\n\n\n

eBPF\u662fBPF\uff08Berkeley Packet Filter\uff09\u7684\u6269\u5c55\u7248\u672c\u3002BPF\u6700\u521d\u7531\u52b3\u4f26\u65af\u4f2f\u514b\u5229\u5b9e\u9a8c\u5ba4\u5f00\u53d1\uff0c\u7528\u4e8e\u5728\u7f51\u7edc\u6570\u636e\u5305\u6355\u83b7\u65f6\u8fdb\u884c\u9ad8\u6548\u7684\u8fc7\u6ee4\u3002eBPF\u5219\u5728\u6b64\u57fa\u7840\u4e0a\u8fdb\u884c\u4e86\u5927\u5e45\u6269\u5c55\uff0c\u4f7f\u5176\u4e0d\u4ec5\u9650\u4e8e\u7f51\u7edc\u5305\u8fc7\u6ee4\uff0c\u8fd8\u80fd\u7528\u4e8e\u5185\u6838\u8ffd\u8e2a\u3001\u6027\u80fd\u76d1\u63a7\u3001\u5b89\u5168\u5ba1\u8ba1\u7b49\u591a\u79cd\u573a\u666f\u3002<\/p>\n\n\n\n\n\n\n\n\n

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

eBPF\u7684\u6838\u5fc3\u601d\u60f3\u662f\u5141\u8bb8\u7528\u6237\u7a7a\u95f4\u7a0b\u5e8f\u5728\u4e0d\u4fee\u6539\u5185\u6838\u4ee3\u7801\u7684\u60c5\u51b5\u4e0b\uff0c\u5411\u5185\u6838\u6ce8\u5165\u81ea\u5b9a\u4e49\u7684\u903b\u8f91\u3002\u8fd9\u4e9b\u81ea\u5b9a\u4e49\u903b\u8f91\u4ee5eBPF\u7a0b\u5e8f\u7684\u5f62\u5f0f\u5b58\u5728\uff0c\u8fd0\u884c\u5728\u5185\u6838\u7684\u4e00\u4e2a\u6c99\u76d2\u73af\u5883\u4e2d\uff0c\u786e\u4fdd\u4e86\u7cfb\u7edf\u7684\u5b89\u5168\u6027\u3002<\/p>\n\n\n\n\n

eBPF\u7684\u5de5\u4f5c\u539f\u7406<\/h3>\n\n\n\n\n

eBPF\u7a0b\u5e8f\u7531\u7528\u6237\u7a7a\u95f4\u7f16\u5199\uff0c\u901a\u5e38\u4f7f\u7528C\u8bed\u8a00\u6216\u5176\u4ed6\u9ad8\u7ea7\u8bed\u8a00\uff0c\u7136\u540e\u901a\u8fc7eBPF\u7f16\u8bd1\u5668\u8f6c\u6362\u4e3aeBPF\u6307\u4ee4\u96c6\u3002\u8fd9\u4e9b\u6307\u4ee4\u96c6\u88ab\u52a0\u8f7d\u5230\u5185\u6838\u4e2d\uff0c\u7531eBPF\u865a\u62df\u673a\u6267\u884c\u3002eBPF\u865a\u62df\u673a\u5bf9\u52a0\u8f7d\u7684\u7a0b\u5e8f\u8fdb\u884c\u4e25\u683c\u7684\u9a8c\u8bc1\uff0c\u786e\u4fdd\u5176\u4e0d\u4f1a\u5bf9\u7cfb\u7edf\u7a33\u5b9a\u6027\u9020\u6210\u5a01\u80c1\u3002<\/p>\n\n\n\n\n

1. \u7f16\u5199eBPF\u7a0b\u5e8f<\/h4>\n\n\n\n\n

eBPF\u7a0b\u5e8f\u901a\u5e38\u4f7f\u7528\u9ad8\u7ea7\u8bed\u8a00\u7f16\u5199\uff0c\u4f8b\u5982C\u8bed\u8a00\u3002\u7f16\u5199\u5b8c\u6210\u540e\uff0c\u9700\u8981\u901a\u8fc7\u4e13\u95e8\u7684\u7f16\u8bd1\u5668\uff08\u5982LLVM\uff09\u5c06\u5176\u7f16\u8bd1\u4e3aeBPF\u6307\u4ee4\u96c6\u3002<\/p>\n\n\n\n\n

#include <linux\/bpf.h>
\n#include <bpf\/bpf_helpers.h>
\n
\nSEC("xdp")
\nint xdp_filter(struct xdp_md *ctx) {
\n    void *data = (void *)(long)ctx->data;
\n    void *data_end = (void *)(long)ctx->data_end;
\n    
\n    \/\/ \u7b80\u5355\u7684\u5305\u8fc7\u6ee4\u903b\u8f91
\n    if (data + sizeof(struct ethhdr) <= data_end) {
\n        struct ethhdr *eth = data;
\n        if (eth->h_proto == htons(ETH_P_IP)) {
\n            return XDP_DROP;
\n        }
\n    }
\n    
\n    return XDP_PASS;
\n}
\n
\nchar _license[] SEC("license") = "GPL";
\n<\/code><\/pre>\n\n\n\n\n
2. \u52a0\u8f7d\u548c\u9a8c\u8bc1<\/h4>\n\n\n\n\n
\u7f16\u8bd1\u540e\u7684eBPF\u7a0b\u5e8f\u901a\u8fc7\u7528\u6237\u7a7a\u95f4\u5de5\u5177\uff08\u5982bpftool\u6216libbpf\uff09\u52a0\u8f7d\u5230\u5185\u6838\u4e2d\u3002\u5185\u6838\u7684eBPF\u9a8c\u8bc1\u5668\u4f1a\u5bf9\u7a0b\u5e8f\u8fdb\u884c\u4e25\u683c\u7684\u68c0\u67e5\uff0c\u786e\u4fdd\u5176\u4e0d\u4f1a\u5bfc\u81f4\u7cfb\u7edf\u5d29\u6e83\u6216\u6267\u884c\u6076\u610f\u64cd\u4f5c\u3002<\/p>\n\n\n\n\n
3. \u6267\u884c\u548c\u6570\u636e\u5904\u7406<\/h4>\n\n\n\n\n
\u901a\u8fc7\u9a8c\u8bc1\u7684eBPF\u7a0b\u5e8f\u4f1a\u88ab\u6302\u8f7d\u5230\u7279\u5b9a\u7684\u94a9\u5b50\u70b9\uff08\u5982\u7f51\u7edc\u5305\u5904\u7406\u3001\u7cfb\u7edf\u8c03\u7528\u7b49\uff09\uff0c\u5e76\u5728\u76f8\u5e94\u7684\u4e8b\u4ef6\u53d1\u751f\u65f6\u6267\u884c\u3002eBPF\u7a0b\u5e8f\u53ef\u4ee5\u8bfb\u53d6\u548c\u4fee\u6539\u6570\u636e\uff0c\u4f46\u4e0d\u80fd\u76f4\u63a5\u8c03\u7528\u5185\u6838\u51fd\u6570\uff0c\u53ea\u80fd\u901a\u8fc7\u7279\u5b9a\u7684\u52a9\u624b\u51fd\u6570\uff08helpers\uff09\u4e0e\u5185\u6838\u4ea4\u4e92\u3002<\/p>\n\n\n\n\n
eBPF\u5728\u7cfb\u7edf\u5b89\u5168\u6027\u4e2d\u7684\u5e94\u7528<\/h3>\n\n\n\n\n
eBPF\u6280\u672f\u5728\u7cfb\u7edf\u5b89\u5168\u6027\u65b9\u9762\u6709\u7740\u5e7f\u6cdb\u7684\u5e94\u7528\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5178\u578b\u7684\u5e94\u7528\u573a\u666f\uff1a<\/p>\n\n\n\n\n
1. \u7f51\u7edc\u5b89\u5168<\/h4>\n\n\n\n\n
eBPF\u53ef\u4ee5\u7528\u4e8e\u7f51\u7edc\u5305\u8fc7\u6ee4\u3001\u6d41\u91cf\u76d1\u63a7\u548c\u5165\u4fb5\u68c0\u6d4b\u3002\u901a\u8fc7\u5728\u5185\u6838\u5c42\u9762\u62e6\u622a\u548c\u5904\u7406\u7f51\u7edc\u5305\uff0ceBPF\u53ef\u4ee5\u5b9e\u73b0\u9ad8\u6548\u7684\u7f51\u7edc\u9632\u62a4\u3002<\/p>\n\n\n\n\n
    \n\n\n
  • \u5305\u8fc7\u6ee4<\/strong>\uff1aeBPF\u7a0b\u5e8f\u53ef\u4ee5\u6302\u8f7d\u5230XDP\uff08eXpress Data Path\uff09\u94a9\u5b50\u70b9\uff0c\u5bf9\u8fdb\u5165\u548c\u79bb\u5f00\u7684\u7f51\u7edc\u5305\u8fdb\u884c\u8fc7\u6ee4\uff0c\u963b\u6b62\u6076\u610f\u6d41\u91cf\u3002<\/li>\n\n\n\n\n
  • \u6d41\u91cf\u76d1\u63a7<\/strong>\uff1a\u901a\u8fc7eBPF\u7a0b\u5e8f\u6536\u96c6\u7f51\u7edc\u6d41\u91cf\u6570\u636e\uff0c\u5b9e\u65f6\u76d1\u63a7\u548c\u5206\u6790\u7f51\u7edc\u884c\u4e3a\uff0c\u53ca\u65f6\u53d1\u73b0\u5f02\u5e38\u6d41\u91cf\u3002<\/li>\n\n\n\n\n
  • \u5165\u4fb5\u68c0\u6d4b<\/strong>\uff1a\u7ed3\u5408\u673a\u5668\u5b66\u4e60\u548c\u89c4\u5219\u5339\u914d\uff0ceBPF\u53ef\u4ee5\u8bc6\u522b\u548c\u963b\u6b62\u6f5c\u5728\u7684\u5165\u4fb5\u884c\u4e3a\u3002<\/li>\n\n\n<\/ul>\n\n\n\n\n
    2. \u7cfb\u7edf\u8c03\u7528\u76d1\u63a7<\/h4>\n\n\n\n\n
    eBPF\u53ef\u4ee5\u76d1\u63a7\u548c\u5ba1\u8ba1\u7cfb\u7edf\u8c03\u7528\uff0c\u68c0\u6d4b\u548c\u963b\u6b62\u6076\u610f\u884c\u4e3a\u3002<\/p>\n\n\n\n\n
      \n\n\n
    • \u5ba1\u8ba1\u65e5\u5fd7<\/strong>\uff1a\u8bb0\u5f55\u6240\u6709\u7cfb\u7edf\u8c03\u7528\u53ca\u5176\u53c2\u6570\uff0c\u7528\u4e8e\u4e8b\u540e\u5206\u6790\u548c\u53d6\u8bc1\u3002<\/li>\n\n\n\n\n
    • \u884c\u4e3a\u68c0\u6d4b<\/strong>\uff1a\u901a\u8fc7\u5206\u6790\u7cfb\u7edf\u8c03\u7528\u5e8f\u5217\uff0c\u8bc6\u522b\u5f02\u5e38\u884c\u4e3a\uff0c\u5982\u63d0\u6743\u64cd\u4f5c\u3001\u654f\u611f\u6587\u4ef6\u8bbf\u95ee\u7b49\u3002<\/li>\n\n\n\n\n
    • \u8bbf\u95ee\u63a7\u5236<\/strong>\uff1a\u57fa\u4e8e\u7cfb\u7edf\u8c03\u7528\u53c2\u6570\u548c\u4e0a\u4e0b\u6587\uff0c\u5b9e\u65bd\u7ec6\u7c92\u5ea6\u7684\u8bbf\u95ee\u63a7\u5236\u7b56\u7565\u3002<\/li>\n\n\n<\/ul>\n\n\n\n\n
      3. \u8fdb\u7a0b\u76d1\u63a7<\/h4>\n\n\n\n\n
      eBPF\u53ef\u4ee5\u76d1\u63a7\u8fdb\u7a0b\u7684\u521b\u5efa\u3001\u6267\u884c\u548c\u7ec8\u6b62\uff0c\u68c0\u6d4b\u548c\u963b\u6b62\u6076\u610f\u8fdb\u7a0b\u3002<\/p>\n\n\n\n\n
        \n\n\n
      • \u8fdb\u7a0b\u521b\u5efa\u76d1\u63a7<\/strong>\uff1a\u8bb0\u5f55\u6240\u6709\u8fdb\u7a0b\u521b\u5efa\u4e8b\u4ef6\uff0c\u5206\u6790\u5176\u7236\u8fdb\u7a0b\u3001\u6267\u884c\u8def\u5f84\u7b49\u4fe1\u606f\u3002<\/li>\n\n\n\n\n
      • \u6267\u884c\u6587\u4ef6\u76d1\u63a7<\/strong>\uff1a\u68c0\u6d4b\u8fdb\u7a0b\u6267\u884c\u7684\u6587\u4ef6\u662f\u5426\u88ab\u7be1\u6539\u6216\u5b58\u5728\u6076\u610f\u4ee3\u7801\u3002<\/li>\n\n\n\n\n
      • \u8d44\u6e90\u4f7f\u7528\u76d1\u63a7<\/strong>\uff1a\u76d1\u63a7\u8fdb\u7a0b\u7684\u8d44\u6e90\u4f7f\u7528\u60c5\u51b5\uff0c\u5982CPU\u3001\u5185\u5b58\u7b49\uff0c\u53ca\u65f6\u53d1\u73b0\u5f02\u5e38\u6d88\u8017\u3002<\/li>\n\n\n<\/ul>\n\n\n\n\n
        eBPF\u5728\u7cfb\u7edf\u7a33\u5b9a\u6027\u4e2d\u7684\u5e94\u7528<\/h3>\n\n\n\n\n
        \u9664\u4e86\u5b89\u5168\u6027\uff0ceBPF\u5728\u63d0\u5347\u7cfb\u7edf\u7a33\u5b9a\u6027\u65b9\u9762\u4e5f\u6709\u7740\u91cd\u8981\u4f5c\u7528\u3002<\/p>\n\n\n\n\n
        1. \u6027\u80fd\u76d1\u63a7<\/h4>\n\n\n\n\n
        eBPF\u53ef\u4ee5\u5b9e\u65f6\u76d1\u63a7\u7cfb\u7edf\u7684\u6027\u80fd\u6307\u6807\uff0c\u5e2e\u52a9\u5b9a\u4f4d\u6027\u80fd\u74f6\u9888\u3002<\/p>\n\n\n\n\n
          \n\n\n
        • CPU\u4f7f\u7528\u7387<\/strong>\uff1a\u76d1\u63a7\u5404\u4e2a\u8fdb\u7a0b\u548c\u7ebf\u7a0b\u7684CPU\u4f7f\u7528\u60c5\u51b5\uff0c\u8bc6\u522b\u9ad8\u8d1f\u8f7d\u8fdb\u7a0b\u3002<\/li>\n\n\n\n\n
        • \u5185\u5b58\u4f7f\u7528<\/strong>\uff1a\u76d1\u63a7\u5185\u5b58\u5206\u914d\u548c\u91ca\u653e\u60c5\u51b5\uff0c\u68c0\u6d4b\u5185\u5b58\u6cc4\u6f0f\u548c\u5f02\u5e38\u6d88\u8017\u3002<\/li>\n\n\n\n\n
        • I\/O\u6027\u80fd<\/strong>\uff1a\u76d1\u63a7\u78c1\u76d8\u548c\u7f51\u7edcI\/O\u6027\u80fd\uff0c\u5206\u6790\u8bfb\u5199\u5ef6\u8fdf\u548c\u541e\u5410\u91cf\u3002<\/li>\n\n\n<\/ul>\n\n\n\n\n
          2. \u6545\u969c\u8bca\u65ad<\/h4>\n\n\n\n\n
          eBPF\u53ef\u4ee5\u5e2e\u52a9\u8bca\u65ad\u7cfb\u7edf\u6545\u969c\uff0c\u5feb\u901f\u5b9a\u4f4d\u95ee\u9898\u6839\u6e90\u3002<\/p>\n\n\n\n\n
            \n\n\n
          • \u5d29\u6e83\u5206\u6790<\/strong>\uff1a\u8bb0\u5f55\u7cfb\u7edf\u5d29\u6e83\u65f6\u7684\u5185\u6838\u72b6\u6001\u548c\u8c03\u7528\u6808\uff0c\u5e2e\u52a9\u5206\u6790\u5d29\u6e83\u539f\u56e0\u3002<\/li>\n\n\n\n\n
          • \u5ef6\u8fdf\u5206\u6790<\/strong>\uff1a\u76d1\u63a7\u7cfb\u7edf\u8c03\u7528\u7684\u6267\u884c\u65f6\u95f4\uff0c\u8bc6\u522b\u5bfc\u81f4\u5ef6\u8fdf\u7684\u74f6\u9888\u70b9\u3002<\/li>\n\n\n\n\n
          • \u8d44\u6e90\u7ade\u4e89<\/strong>\uff1a\u68c0\u6d4b\u591a\u7ebf\u7a0b\u7a0b\u5e8f\u4e2d\u7684\u8d44\u6e90\u7ade\u4e89\u548c\u6b7b\u9501\u95ee\u9898\u3002<\/li>\n\n\n<\/ul>\n\n\n\n\n
            3. \u5bb9\u5668\u76d1\u63a7<\/h4>\n\n\n\n\n
            \u5728\u5bb9\u5668\u5316\u73af\u5883\u4e2d\uff0ceBPF\u53ef\u4ee5\u63d0\u4f9b\u7ec6\u7c92\u5ea6\u7684\u76d1\u63a7\u548c\u5b89\u5168\u7ba1\u7406\u3002<\/p>\n\n\n\n\n
              \n\n\n
            • \u5bb9\u5668\u9694\u79bb<\/strong>\uff1a\u786e\u4fdd\u5bb9\u5668\u4e4b\u95f4\u7684\u8d44\u6e90\u9694\u79bb\uff0c\u9632\u6b62\u8d44\u6e90\u62a2\u5360\u548c\u5e72\u6270\u3002<\/li>\n\n\n\n\n
            • \u7f51\u7edc\u9694\u79bb<\/strong>\uff1a\u901a\u8fc7eBPF\u7a0b\u5e8f\u5b9e\u73b0\u5bb9\u5668\u7f51\u7edc\u7684\u5b89\u5168\u9694\u79bb\uff0c\u9632\u6b62\u8de8\u5bb9\u5668\u653b\u51fb\u3002<\/li>\n\n\n\n\n
            • \u6027\u80fd\u76d1\u63a7<\/strong>\uff1a\u76d1\u63a7\u5bb9\u5668\u7684\u8d44\u6e90\u4f7f\u7528\u60c5\u51b5\uff0c\u4f18\u5316\u5bb9\u5668\u8c03\u5ea6\u548c\u8d44\u6e90\u5206\u914d\u3002<\/li>\n\n\n<\/ul>\n\n\n\n\n
              eBPF\u5de5\u5177\u548c\u751f\u6001\u7cfb\u7edf<\/h3>\n\n\n\n\n
              eBPF\u6280\u672f\u7684\u5e94\u7528\u79bb\u4e0d\u5f00\u4e00\u7cfb\u5217\u5de5\u5177\u548c\u5e93\u7684\u652f\u6301\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684eBPF\u5de5\u5177\u548c\u5e93\uff1a<\/p>\n\n\n\n\n
              1. bpftool<\/h4>\n\n\n\n\n
              bpftool\u662fLinux\u5185\u6838\u63d0\u4f9b\u7684\u4e00\u4e2a\u547d\u4ee4\u884c\u5de5\u5177\uff0c\u7528\u4e8e\u7ba1\u7406\u548c\u8c03\u8bd5eBPF\u7a0b\u5e8f\u3002\u5b83\u53ef\u4ee5\u52a0\u8f7d\u3001\u5378\u8f7d\u3001\u67e5\u8be2\u548c\u4fee\u6539eBPF\u7a0b\u5e8f\u53ca\u5176\u6620\u5c04\u3002<\/p>\n\n\n\n\n
              # \u52a0\u8f7deBPF\u7a0b\u5e8f
              \nbpftool prog load \/path\/to\/ebpf_program.o \/sys\/fs\/bpf\/my_program
              \n
              \n# \u67e5\u770beBPF\u7a0b\u5e8f
              \nbpftool prog show
              \n
              \n# \u67e5\u770beBPF\u6620\u5c04
              \nbpftool map show
              \n<\/code><\/pre>\n\n\n\n\n
              2. libbpf<\/h4>\n\n\n\n\n
              libbpf\u662f\u4e00\u4e2aC\u5e93\uff0c\u63d0\u4f9b\u4e86\u7528\u4e8e\u7f16\u5199\u548c\u52a0\u8f7deBPF\u7a0b\u5e8f\u7684API\u3002\u5b83\u7b80\u5316\u4e86eBPF\u7a0b\u5e8f\u7684\u7f16\u5199\u548c\u52a0\u8f7d\u8fc7\u7a0b\uff0c\u4f7f\u5f97\u5f00\u53d1\u8005\u53ef\u4ee5\u66f4\u65b9\u4fbf\u5730\u4f7f\u7528eBPF\u6280\u672f\u3002<\/p>\n\n\n\n\n
              #include <bpf\/libbpf.h>
              \n
              \nint main() {
              \n    struct bpf_object *obj;
              \n    int err;
              \n
              \n    obj = bpf_object__open_file("\/path\/to\/ebpf_program.o", NULL);
              \n    if (libbpf_get_error(obj)) {
              \n        fprintf(stderr, "Error opening BPF object file\\n");
              \n        return 1;
              \n    }
              \n
              \n    err = bpf_object__load(obj);
              \n    if (err) {
              \n        fprintf(stderr, "Error loading BPF object\\n");
              \n        return 1;
              \n    }
              \n
              \n    \/\/ \u4f7f\u7528eBPF\u7a0b\u5e8f...
              \n
              \n    bpf_object__close(obj);
              \n    return 0;
              \n}
              \n<\/code><\/pre>\n\n\n\n\n
              3. BCC<\/h4>\n\n\n\n\n
              BCC\uff08BPF Compiler Collection\uff09\u662f\u4e00\u4e2a\u7528\u4e8e\u7f16\u5199eBPF\u7a0b\u5e8f\u7684\u5de5\u5177\u96c6\uff0c\u63d0\u4f9b\u4e86Python\u3001C++\u7b49\u591a\u79cd\u8bed\u8a00\u7684\u7ed1\u5b9a\u3002\u5b83\u7b80\u5316\u4e86eBPF\u7a0b\u5e8f\u7684\u7f16\u5199\u548c\u8c03\u8bd5\u8fc7\u7a0b\uff0c\u9002\u5408\u5feb\u901f\u5f00\u53d1\u548c\u539f\u578b\u9a8c\u8bc1\u3002<\/p>\n\n\n\n\n
              from bcc import BPF
              \n
              \nbpf_program = """
              \nint xdp_filter(struct xdp_md *ctx) {
              \n    \/\/ eBPF\u7a0b\u5e8f\u4ee3\u7801
              \n    return XDP_PASS;
              \n}
              \n"""
              \n
              \nbpf = BPF(text=bpf_program)
              \nfn = bpf.load_func("xdp_filter", BPF.XDP)
              \nbpf.attach_xdp(device="eth0", fn=fn)
              \n
              \ntry:
              \n    bpf.trace_print()
              \nexcept KeyboardInterrupt:
              \n    pass
              \n
              \nbpf.remove_xdp(device="eth0")
              \n<\/code><\/pre>\n\n\n\n\n
              eBPF\u7684\u6311\u6218\u548c\u672a\u6765<\/h3>\n\n\n\n\n
              \u5c3d\u7ba1eBPF\u6280\u672f\u5728\u7cfb\u7edf\u5b89\u5168\u6027\u548c\u7a33\u5b9a\u6027\u65b9\u9762\u5177\u6709\u5de8\u5927\u6f5c\u529b\uff0c\u4f46\u4e5f\u9762\u4e34\u4e00\u4e9b\u6311\u6218\uff1a<\/p>\n\n\n\n\n
              1. \u590d\u6742\u6027<\/h4>\n\n\n\n\n
              eBPF\u7a0b\u5e8f\u7684\u7f16\u5199\u548c\u8c03\u8bd5\u76f8\u5bf9\u590d\u6742\uff0c\u9700\u8981\u5f00\u53d1\u8005\u5177\u5907\u4e00\u5b9a\u7684\u5185\u6838\u77e5\u8bc6\u548c\u7f16\u7a0b\u7ecf\u9a8c\u3002<\/p>\n\n\n\n\n
              2. \u6027\u80fd\u5f00\u9500<\/h4>\n\n\n\n\n
              \u867d\u7136eBPF\u7a0b\u5e8f\u8fd0\u884c\u5728\u5185\u6838\u4e2d\uff0c\u4f46\u8fc7\u591a\u7684eBPF\u7a0b\u5e8f\u53ef\u80fd\u4f1a\u5bf9\u7cfb\u7edf\u6027\u80fd\u4ea7\u751f\u4e00\u5b9a\u5f71\u54cd\u3002<\/p>\n\n\n\n\n
              3. \u5b89\u5168\u6027<\/h4>\n\n\n\n\n
              eBPF\u7a0b\u5e8f\u8fd0\u884c\u5728\u5185\u6838\u73af\u5883\u4e2d\uff0c\u4e00\u65e6\u5b58\u5728\u6f0f\u6d1e\uff0c\u53ef\u80fd\u4f1a\u5bf9\u7cfb\u7edf\u5b89\u5168\u9020\u6210\u5a01\u80c1\u3002<\/p>\n\n\n\n\n
              \u672a\u6765\uff0c\u968f\u7740eBPF\u6280\u672f\u7684\u4e0d\u65ad\u53d1\u5c55\u548c\u5b8c\u5584\uff0c\u8fd9\u4e9b\u95ee\u9898\u6709\u671b\u5f97\u5230\u89e3\u51b3\u3002eBPF\u7684\u751f\u6001\u7cfb\u7edf\u4e5f\u5728\u4e0d\u65ad\u58ee\u5927\uff0c\u8d8a\u6765\u8d8a\u591a\u7684\u5de5\u5177\u548c\u5e93\u5c06\u7b80\u5316eBPF\u7a0b\u5e8f\u7684\u5f00\u53d1\u548c\u5e94\u7528\u3002<\/p>\n\n\n\n\n
              \u603b\u7ed3<\/h3>\n\n\n\n\n
              eBPF\u4f5c\u4e3a\u4e00\u79cd\u65b0\u5174\u7684\u6280\u672f\uff0c\u5728\u7cfb\u7edf\u5b89\u5168\u6027\u548c\u7a33\u5b9a\u6027\u65b9\u9762\u5c55\u73b0\u51fa\u4e86\u5f3a\u5927\u7684\u80fd\u529b\u3002\u901a\u8fc7\u7f16\u5199\u548c\u52a0\u8f7deBPF\u7a0b\u5e8f\uff0c\u53ef\u4ee5\u5728\u4e0d\u4fee\u6539\u5185\u6838\u4ee3\u7801\u7684\u60c5\u51b5\u4e0b\uff0c\u5b9e\u73b0\u5bf9\u7cfb\u7edf\u884c\u4e3a\u7684\u7ec6\u7c92\u5ea6\u76d1\u63a7\u548c\u63a7\u5236\u3002\u65e0\u8bba\u662f\u7f51\u7edc\u5b89\u5168\u3001\u7cfb\u7edf\u8c03\u7528\u76d1\u63a7\uff0c\u8fd8\u662f\u6027\u80fd\u76d1\u63a7\u548c\u6545\u969c\u8bca\u65ad\uff0ceBPF\u90fd\u63d0\u4f9b\u4e86\u9ad8\u6548\u7684\u89e3\u51b3\u65b9\u6848\u3002\u5c3d\u7ba1\u9762\u4e34\u4e00\u4e9b\u6311\u6218\uff0c\u4f46\u968f\u7740\u6280\u672f\u7684\u4e0d\u65ad\u8fdb\u6b65\u548c\u751f\u6001\u7cfb\u7edf\u7684\u5b8c\u5584\uff0ceBPF\u6709\u671b\u5728\u672a\u6765\u7684\u7cfb\u7edf\u7ba1\u7406\u548c\u5b89\u5168\u9632\u62a4\u4e2d\u53d1\u6325\u66f4\u5927\u7684\u4f5c\u7528\u3002<\/p>\n\n\n]]>\t\t<\/p>\n","protected":false},"excerpt":{"rendered":"
              \t\t\t\t\t\t<\/p>\n","protected":false},"author":5,"featured_media":21614,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-21613","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-discussion"],"_links":{"self":[{"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts\/21613","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/comments?post=21613"}],"version-history":[{"count":0,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts\/21613\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/media\/21614"}],"wp:attachment":[{"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/media?parent=21613"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/categories?post=21613"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/tags?post=21613"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}