{"id":57679,"date":"2025-03-03T19:38:37","date_gmt":"2025-03-03T11:38:37","guid":{"rendered":"https:\/\/fwq.ai\/blog\/?p=57679"},"modified":"2025-03-03T19:38:37","modified_gmt":"2025-03-03T11:38:37","slug":"%e5%ad%97%e8%8a%82%e8%b7%b3%e5%8a%a8%e5%bc%80%e6%ba%90-linux-%e5%86%85%e6%a0%b8%e7%bd%91%e7%bb%9c%e6%8a%93%e5%8c%85%e5%b7%a5%e5%85%b7-netcap%ef%bc%8c%e6%94%af%e6%8c%81%e7%be%8e%e5%9b%bd%e6%9c%8d","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/57679\/","title":{"rendered":"\u5b57\u8282\u8df3\u52a8\u5f00\u6e90 Linux \u5185\u6838\u7f51\u7edc\u6293\u5305\u5de5\u5177 netcap\uff0c\u652f\u6301\u7f8e\u56fd\u670d\u52a1\u5668\u6570\u636e\u6355\u83b7"},"content":{"rendered":"<p>\u5728 Linux \u5185\u6838\u7f51\u7edc\u5f00\u53d1\u4e2d\uff0c\u7f51\u7edc\u4e22\u5305\u4e00\u76f4\u662f\u4e00\u4e2a\u4ee4\u4eba\u5934\u75bc\u7684\u95ee\u9898\u3002\u4f20\u7edf\u7684\u7f51\u7edc\u6293\u5305\u5de5\u5177\uff08\u5982 <code>tcpdump<\/code>\uff09\u867d\u80fd\u534f\u52a9\u6392\u67e5\u95ee\u9898\uff0c\u4f46\u6548\u7387\u4e0d\u9ad8\uff0c\u4e14\u5728\u6df1\u5165\u5206\u6790\u7f51\u7edc\u4e22\u5305\u65f6\u5b58\u5728\u8bf8\u591a\u9650\u5236\u3002\u5982\u4eca\uff0c\u968f\u7740 <strong>eBPF<\/strong> \u6280\u672f\u7684\u5d1b\u8d77\uff0c\u5b57\u8282\u8df3\u52a8 <strong>STE<\/strong> \u56e2\u961f\u57fa\u4e8e\u8be5\u6280\u672f\u5f00\u53d1\u4e86\u4e00\u6b3e\u5f3a\u5927\u7684\u5185\u6838\u7f51\u7edc\u6293\u5305\u5de5\u5177\u2014\u2014 <strong>netcap<\/strong>\uff08\u5168\u79f0 net capture\uff0c\u5185\u90e8\u539f\u540d <strong>xcap<\/strong>\uff09\uff0c\u5e76\u5df2\u6b63\u5f0f <strong>\u5f00\u6e90<\/strong>\uff01<\/p>\n<p>\ud83d\udccc <strong>GitHub \u5730\u5740<\/strong>\uff1a<a href=\"https:\/\/github.com\/bytedance\/netcap\">https:\/\/github.com\/bytedance\/netcap<\/a><\/p>\n<p>\u8be5\u5de5\u5177\u53ef\u4ee5\u7528\u4e8e <strong>\u7f8e\u56fd\u670d\u52a1\u5668<\/strong>\uff0c\u5728\u6d77\u5916\u90e8\u7f72 Linux \u670d\u52a1\u5668\u7684\u5f00\u53d1\u8005\u4e5f\u53ef\u4ee5\u9ad8\u6548\u6392\u67e5\u7f51\u7edc\u95ee\u9898\uff01<\/p>\n<hr \/>\n<h2>\ud83c\udf1f 1. netcap \u4eae\u70b9\u6982\u89c8<\/h2>\n<p>\ud83d\udd0d <strong>\u5168\u5185\u6838\u8ffd\u8e2a\u80fd\u529b<\/strong>\uff1a\u76f8\u6bd4 <code>tcpdump<\/code> \u4ec5\u80fd\u6355\u83b7\u5185\u6838\u534f\u8bae\u6808\u7279\u5b9a\u4f4d\u7f6e\u7684\u6570\u636e\u5305\uff0c<code>netcap<\/code> \u53ef\u4ee5\u8ddf\u8e2a\u6574\u4e2a\u5185\u6838\u7f51\u7edc\u534f\u8bae\u6808\uff08\u6240\u6709 <code>skb<\/code> \u76f8\u5173\u51fd\u6570\uff09\u3002<\/p>\n<p>\ud83d\udca1 <strong>\u517c\u5bb9 <code>tcpdump<\/code> \u8bed\u6cd5<\/strong>\uff1a\u53ef\u4f7f\u7528\u719f\u6089\u7684 <code>tcpdump<\/code> \u8bed\u6cd5\u4f5c\u4e3a\u8fc7\u6ee4\u6761\u4ef6\uff0c\u8f7b\u677e\u638c\u63e1\u6574\u4e2a\u7f51\u7edc\u62a5\u6587\u5728\u5185\u6838\u4e2d\u7684\u5b8c\u6574\u8def\u5f84\u3002<\/p>\n<p>\u26a1 <strong>\u9ad8\u6548\u5b9a\u4f4d\u4e22\u5305<\/strong>\uff1a\u57fa\u4e8e <code>eBPF<\/code> \u6280\u672f\uff0c\u5927\u5e45\u63d0\u5347 <strong>Linux \u670d\u52a1\u5668<\/strong> \u7684\u7f51\u7edc\u4e22\u5305\u95ee\u9898\u6392\u67e5\u6548\u7387\uff0c\u652f\u6301 <strong>\u7f8e\u56fd\u670d\u52a1\u5668<\/strong> \u53ca\u5168\u7403\u6570\u636e\u4e2d\u5fc3\u73af\u5883\u3002<\/p>\n<hr \/>\n<h2>\ud83d\udee0\ufe0f 2. \u4f7f\u7528\u793a\u4f8b<\/h2>\n<h3>\ud83d\udd39 <strong>\u793a\u4f8b 1\uff1a\u8ffd\u8e2a\u7279\u5b9a IP \u5730\u5740\u7684 ICMP \u62a5\u6587<\/strong><\/h3>\n<p>\ud83d\udccc <strong>\u76ee\u6807<\/strong>\uff1a\u67e5\u770b <code>10.227.0.45<\/code> \u7684 <code>icmp<\/code> \u5305\u662f\u5426\u5230\u8fbe <strong>\u5185\u6838\u9884\u671f\u7684\u51fd\u6570\u8c03\u7528\u70b9<\/strong>\u3002<\/p>\n<pre><code class=\"language-bash\">netcap skb -f icmp_rcv@1 -i eth0 -e \"host 10.227.0.45\" -t \"-nnv\"\r\n<\/code><\/pre>\n<p>\ud83d\udd39 <strong>\u53c2\u6570\u89e3\u6790<\/strong>\uff1a<\/p>\n<ul>\n<li><code>-f icmp_rcv@1<\/code>\uff1a\u8ddf\u8e2a <code>icmp_rcv<\/code> \u51fd\u6570\u7684 <strong>\u7b2c 1 \u4e2a\u53c2\u6570<\/strong>\uff08\u5373 <code>skb<\/code>\uff09\u3002<\/li>\n<li><code>-i eth0<\/code>\uff1a\u6307\u5b9a\u7f51\u5361\u63a5\u53e3\u3002<\/li>\n<li><code>-e \"host 10.227.0.45\"<\/code>\uff1a<code>tcpdump<\/code> \u8bed\u6cd5\u8fc7\u6ee4\u89c4\u5219\uff0c\u4ec5\u5173\u6ce8 <code>10.227.0.45<\/code> \u7684\u6570\u636e\u5305\u3002<\/li>\n<li><code>-t \"-nnv\"<\/code>\uff1a<code>tcpdump<\/code> \u683c\u5f0f\u5316\u8f93\u51fa\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\ud83d\udd39 <strong>\u793a\u4f8b 2\uff1a\u5b9a\u4f4d TCP \u7aef\u53e3 9000 \u7684\u4e22\u5305\u70b9<\/strong><\/h3>\n<p>\ud83d\udccc <strong>\u76ee\u6807<\/strong>\uff1a\u67e5\u770b TCP \u7aef\u53e3 <code>9000<\/code> \u7684\u62a5\u6587\u4e22\u5305\u4f4d\u7f6e\uff0c\u5e76\u6253\u5370\u8c03\u7528\u6808\u3002<\/p>\n<pre><code class=\"language-bash\">netcap skb -f tracepoint:skb:kfree_skb -e \"tcp port 9000\" -S\r\n<\/code><\/pre>\n<p>\ud83d\udd39 <strong>\u53c2\u6570\u89e3\u6790<\/strong>\uff1a<\/p>\n<ul>\n<li><code>-f tracepoint:skb:kfree_skb<\/code>\uff1a\u76d1\u63a7 <code>kfree_skb<\/code> \u4e8b\u4ef6\uff0c\u67e5\u627e\u4e22\u5305\u53d1\u751f\u4f4d\u7f6e\u3002<\/li>\n<li><code>-e \"tcp port 9000\"<\/code>\uff1a\u4ec5\u5173\u6ce8 <strong>9000 \u7aef\u53e3<\/strong>\u7684\u6570\u636e\u5305\u3002<\/li>\n<li><code>-S<\/code>\uff1a\u6253\u5370 <strong>\u8c03\u7528\u6808<\/strong>\uff0c\u5feb\u901f\u5b9a\u4f4d\u4e22\u5305\u6e90\u5934\u3002<\/li>\n<\/ul>\n<hr \/>\n<h2>\ud83d\udd2c 3. netcap \u8bbe\u8ba1\u4e0e\u5b9e\u73b0<\/h2>\n<h3>\ud83d\udccc <strong>\u6838\u5fc3\u67b6\u6784<\/strong><\/h3>\n<ul>\n<li><strong>\u57fa\u4e8e eBPF<\/strong>\uff1a\u91c7\u7528 <code>kprobe<\/code> \/ <code>tracepoint<\/code> <strong>\u52a8\u6001 hook<\/strong> \u5173\u952e\u51fd\u6570\uff0c\u63d0\u53d6 <code>skb<\/code> \u548c <code>sock<\/code> \u7ed3\u6784\u4f53\u3002<\/li>\n<li><strong>\u9ad8\u6548\u6570\u636e\u4f20\u8f93<\/strong>\uff1a\u901a\u8fc7 <code>bpf map<\/code> \u4f20\u9012\u6570\u636e\u81f3 <strong>\u7528\u6237\u6001<\/strong>\uff0c\u51cf\u5c11\u5185\u6838\u5e72\u6270\uff0c\u63d0\u9ad8\u6293\u5305\u6548\u7387\u3002<\/li>\n<li><strong>\u4e0e <code>tcpdump<\/code> \u6df1\u5ea6\u7ed3\u5408<\/strong>\uff1a\u5229\u7528 <code>tcpdump<\/code> \u89e3\u6790\u7f51\u7edc\u6570\u636e\u5305\uff0c\u652f\u6301 <code>pcap<\/code> \u683c\u5f0f\u5b58\u50a8\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\ud83c\udfd7 <strong>\u6280\u672f\u5b9e\u73b0<\/strong><\/h3>\n<h4>1\ufe0f\u20e3 <strong>\u57fa\u4e8e <code>tcpdump<\/code> \u8bed\u6cd5\u7684 eBPF \u8fc7\u6ee4<\/strong><\/h4>\n<ul>\n<li><code>netcap<\/code> \u4f7f\u7528 <code>cbpfc<\/code> \u5e93\u5c06 <strong>tcpdump \u8bed\u6cd5<\/strong> \u8f6c\u6362\u4e3a <strong>C \u8bed\u8a00\u51fd\u6570<\/strong>\uff0c\u5d4c\u5165 <code>eBPF<\/code> \u4ee3\u7801\u3002<\/li>\n<li><strong>\u8fc7\u6ee4\u903b\u8f91<\/strong>\uff1a<code>tcpdump<\/code> \u8bed\u6cd5 \u2192 <code>cBPF<\/code> \u6307\u4ee4\u7801 \u2192 <code>C \u8bed\u8a00\u51fd\u6570<\/code> \u2192 <code>eBPF \u7a0b\u5e8f<\/code>\u3002<\/li>\n<\/ul>\n<h4>2\ufe0f\u20e3 <strong>\u5982\u4f55\u89e3\u6790\u5e76\u663e\u793a\u6570\u636e\u5305<\/strong><\/h4>\n<ul>\n<li><code>netcap<\/code> \u542f\u52a8\u540e\uff0c\u4f1a <strong>\u81ea\u52a8\u8fd0\u884c <code>tcpdump<\/code><\/strong>\uff0c\u4ee5 <strong>\u6807\u51c6\u8f93\u5165\u6d41<\/strong> \u89e3\u6790 <code>pcap<\/code> \u6570\u636e\uff0c\u5e76\u4ee5\u7528\u6237\u6307\u5b9a\u7684\u683c\u5f0f\u8f93\u51fa\u3002<\/li>\n<\/ul>\n<h4>3\ufe0f\u20e3 <strong>\u5982\u4f55\u83b7\u53d6\u5b8c\u6574\u7684 skb \u6570\u636e<\/strong><\/h4>\n<ul>\n<li>\u5728 <strong>\u53d1\u9001\u65b9\u5411<\/strong>\uff0c\u6709\u4e9b <code>skb<\/code> \u7ed3\u6784\u672a\u5b8c\u6574\u586b\u5145\uff08\u5982 <code>__ip_finish_output<\/code>\uff09\u3002<\/li>\n<li><code>netcap<\/code> \u901a\u8fc7 <code>sock<\/code> \u7ed3\u6784 <strong>\u63a8\u5bfc<\/strong> \u5e76 <strong>\u8865\u5168<\/strong> \u5173\u952e\u4fe1\u606f\uff0c\u786e\u4fdd\u6570\u636e\u5305\u5b8c\u6574\u3002<\/li>\n<\/ul>\n<hr \/>\n<h2>\ud83d\udd04 4. \u9ad8\u7ea7\u529f\u80fd\u4e0e\u6269\u5c55<\/h2>\n<h3>\ud83d\udd39 <strong>\u591a Trace \u70b9\u65f6\u95f4\u5206\u6790<\/strong><\/h3>\n<p>\ud83d\udccc <strong>\u76ee\u6807<\/strong>\uff1a\u8ddf\u8e2a\u6570\u636e\u5305\u7ecf\u8fc7 <strong>\u591a\u4e2a trace \u70b9<\/strong> \u7684\u65f6\u95f4\uff0c\u8ba1\u7b97\u7f51\u7edc\u5ef6\u8fdf\u3002<\/p>\n<pre><code class=\"language-bash\">netcap skb -f tracepoint:net:netif_receive_skb,ip_local_deliver@1,ip_local_deliver_finish@3,icmp_rcv@1 -e \"host 10.227.0.72 and icmp\" -i eth0  --gather --gather-output-color cyan\r\n<\/code><\/pre>\n<p>\ud83d\udccc <strong>\u8f93\u51fa\u793a\u4f8b<\/strong>\uff1a\u4e0d\u540c trace \u70b9\u7684 <strong>\u65f6\u95f4\u6233<\/strong>\uff0c\u53ef\u7528\u4e8e\u5206\u6790 <strong>\u6570\u636e\u5305\u7684\u7f51\u7edc\u65f6\u5ef6<\/strong>\u3002<\/p>\n<hr \/>\n<h3>\ud83d\udd39 <strong>\u81ea\u5b9a\u4e49\u8fc7\u6ee4\u4e0e\u8f93\u51fa<\/strong><\/h3>\n<p>\ud83d\udccc <strong>\u76ee\u6807<\/strong>\uff1a\u7528\u6237\u53ef\u4ee5 <strong>\u81ea\u5b9a\u4e49\u8fc7\u6ee4\u89c4\u5219\u548c\u8f93\u51fa\u683c\u5f0f<\/strong>\uff0c\u589e\u5f3a\u8c03\u8bd5\u80fd\u529b\u3002<\/p>\n<h4>1\ufe0f\u20e3 <strong>\u81ea\u5b9a\u4e49\u8fc7\u6ee4<\/strong><\/h4>\n<pre><code class=\"language-c\">static inline int xcap_user_filter(void *ctx, void *pkt, u16 trace_index) {\r\n    return 1;  \/\/ \u8fd4\u56de 1 \u4ee3\u8868\u4e0d\u8fc7\u6ee4\r\n}\r\n<\/code><\/pre>\n<h4>2\ufe0f\u20e3 <strong>\u81ea\u5b9a\u4e49\u8f93\u51fa<\/strong><\/h4>\n<pre><code class=\"language-c\">struct xcap_user_extend {\r\n    int a;  \/\/ format: 0x%x\r\n    uint32_t b;\r\n    int64_t c;     \r\n    uint8_t x1; \/\/ format: %c\r\n};\r\n<\/code><\/pre>\n<p>\ud83d\udccc <strong>\u652f\u6301\u7684\u6570\u636e\u7c7b\u578b<\/strong>\uff1a<code>int8_t, uint8_t, char, int16_t, uint16_t, int, uint32_t, int64_t, uint64_t<\/code>\uff08\u4e0d\u652f\u6301\u6307\u9488\u548c\u6570\u7ec4\uff09\u3002<\/p>\n<hr \/>\n<h2>\ud83d\ude80 5. \u672a\u6765\u5c55\u671b<\/h2>\n<p><code>netcap<\/code> \u5df2\u7ecf\u6210\u4e3a <strong>Linux \u670d\u52a1\u5668<\/strong> \u4e0a\u5f3a\u5927\u7684\u7f51\u7edc\u6293\u5305\u5de5\u5177\uff0c\u7279\u522b\u9002\u7528\u4e8e <a href=\"https:\/\/fwq.ai\/\"><strong>\u7f8e\u56fd\u670d\u52a1\u5668<\/strong><\/a> \u548c\u5168\u7403\u4e91\u8ba1\u7b97\u73af\u5883\u3002\u672a\u6765\uff0c\u56e2\u961f\u5c06\u7ee7\u7eed\u4f18\u5316\u4ee5\u4e0b\u529f\u80fd\uff1a<\/p>\n<p>\u2705 <strong>\u589e\u5f3a DPDK \u652f\u6301<\/strong>\uff0c\u63d0\u5347\u9ad8\u6027\u80fd\u7f51\u7edc\u6570\u636e\u5305\u6293\u53d6\u80fd\u529b\u3002<br \/>\n\u2705 <strong>\u652f\u6301\u591a\u79cd Linux \u5185\u6838\u7248\u672c<\/strong>\uff0c\u63d0\u5347\u517c\u5bb9\u6027\u3002<br \/>\n\u2705 <strong>\u4f18\u5316\u81ea\u5b9a\u4e49\u8f93\u51fa<\/strong>\uff0c\u89e3\u51b3\u9ad8\u5e76\u53d1\u573a\u666f\u4e0b\u7684\u65e5\u5fd7\u9519\u4e71\u95ee\u9898\u3002<\/p>\n<p><strong>\u6b22\u8fce\u5f00\u53d1\u8005\u4eec Star &amp; PR\uff0c\u4e00\u8d77\u5171\u5efa\u5f00\u6e90\u9879\u76ee\uff01<\/strong><br \/>\n<strong>GitHub \u5730\u5740<\/strong>\uff1a<a href=\"https:\/\/github.com\/bytedance\/netcap\">https:\/\/github.com\/bytedance\/netcap<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 Linux \u5185\u6838\u7f51\u7edc\u5f00\u53d1\u4e2d\uff0c\u7f51\u7edc\u4e22\u5305\u4e00\u76f4\u662f\u4e00\u4e2a\u4ee4\u4eba\u5934\u75bc\u7684\u95ee\u9898\u3002\u4f20\u7edf\u7684\u7f51\u7edc\u6293\u5305\u5de5\u5177\uff08\u5982 tcpdump\uff09\u867d\u80fd\u534f\u52a9\u6392\u67e5\u95ee\u9898\uff0c\u4f46\u6548\u7387\u4e0d\u9ad8\uff0c\u4e14\u5728\u6df1\u5165\u5206\u6790\u7f51\u7edc\u4e22\u5305\u65f6\u5b58\u5728\u8bf8\u591a\u9650\u5236\u3002\u5982\u4eca\uff0c\u968f\u7740 eBPF \u6280\u672f\u7684\u5d1b\u8d77\uff0c\u5b57\u8282\u8df3\u52a8 STE \u56e2\u961f\u57fa\u4e8e\u8be5\u6280\u672f\u5f00\u53d1\u4e86\u4e00\u6b3e\u5f3a\u5927\u7684\u5185\u6838\u7f51\u7edc\u6293\u5305\u5de5\u5177\u2014\u2014 netcap\uff08\u5168\u79f0 net capture\uff0c\u5185\u90e8\u539f\u540d xcap\uff09\uff0c\u5e76\u5df2\u6b63\u5f0f \u5f00\u6e90\uff01 \ud83d\udccc GitHub \u5730\u5740\uff1ahttps:\/\/github.com\/bytedance\/netcap \u8be5\u5de5\u5177\u53ef\u4ee5\u7528\u4e8e \u7f8e\u56fd\u670d\u52a1\u5668\uff0c\u5728\u6d77\u5916\u90e8\u7f72 Linux \u670d\u52a1\u5668\u7684\u5f00\u53d1\u8005\u4e5f\u53ef\u4ee5\u9ad8\u6548\u6392\u67e5\u7f51\u7edc\u95ee\u9898\uff01 \ud83c\udf1f 1. netcap \u4eae\u70b9\u6982\u89c8 \ud83d\udd0d 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