{"id":37110,"date":"2025-04-18T10:48:33","date_gmt":"2025-04-18T02:48:33","guid":{"rendered":"https:\/\/www.yunshan.net\/blog\/?p=37110"},"modified":"2025-04-18T10:48:33","modified_gmt":"2025-04-18T02:48:33","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8ebpf%e8%bf%9b%e8%a1%8c%e7%bd%91%e7%bb%9c%e5%8d%8f%e8%ae%ae%e6%a0%88%e7%9a%84%e4%bc%98%e5%8c%96%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.yunshan.net\/blog\/archives\/37110.html","title":{"rendered":"\u5982\u4f55\u4f7f\u7528eBPF\u8fdb\u884c\u7f51\u7edc\u534f\u8bae\u6808\u7684\u4f18\u5316\uff1f"},"content":{"rendered":"

\n

\"\u5982\u4f55\u4f7f\u7528eBPF\u8fdb\u884c\u7f51\u7edc\u534f\u8bae\u6808\u7684\u4f18\u5316\uff1f\"<\/p>\n<\/p>\n

\u5728\u6570\u636e\u4e2d\u5fc3\u541e\u5410\u91cf\u7a81\u7834\u767e\u4e07QPS\u7684\u65f6\u4ee3\uff0c\u7f51\u7edc\u5ef6\u8fdf\u6bcf\u964d\u4f4e1\u5fae\u79d2\u90fd\u610f\u5473\u7740\u5343\u4e07\u7ea7\u6210\u672c\u8282\u7701\u3002\u5f53\u4f20\u7edf\u5185\u6838\u4f18\u5316\u906d\u9047\u6027\u80fd\u74f6\u9888\uff0c\u4e00\u9879\u6e90\u81eaBSD\u6570\u636e\u5305\u8fc7\u6ee4\u5668\u7684\u6280\u672f\u6b63\u5728\u5f15\u53d1\u7f51\u7edc\u534f\u8bae\u6808\u7684\u9769\u547d\u2014\u2014eBPF<\/a>\u901a\u8fc7\u52a8\u6001\u6ce8\u5165\u5b89\u5168\u53ef\u63a7\u7684\u6c99\u76d2\u7a0b\u5e8f\uff0c\u4f7f\u5f00\u53d1\u8005\u80fd\u591f\u5728\u4e0d\u91cd\u65b0\u7f16\u8bd1\u5185\u6838\u7684\u524d\u63d0\u4e0b\uff0c\u5bf9\u7f51\u7edc\u6570\u636e\u8def\u5f84\u8fdb\u884c\u6df1\u5ea6\u5b9a\u5236<\/strong>\u3002\u8fd9\u79cd\u7a81\u7834\u6027\u7684\u6280\u672f\u8303\u5f0f\uff0c\u6b63\u5728\u5e2e\u52a9Cloudflare\u5b9e\u73b0\u5168\u7403\u8fb9\u7f18\u7f51\u7edc\u7684\u96f6\u4e22\u5305\u8f6c\u53d1\uff0c\u652f\u6491Facebook\u767e\u4e07\u7ea7\u670d\u52a1\u5668\u96c6\u7fa4\u7684\u667a\u80fd\u6d41\u91cf\u8c03\u5ea6\u3002<\/p>\n

\u4e00\u3001eBPF<\/a>\u6280\u672f\u5185\u6838\u4e0e\u7f51\u7edc\u6027\u80fd\u74f6\u9888\u7a81\u7834<\/h3>\n

\u4f20\u7edf\u7f51\u7edc\u534f\u8bae\u6808\u7684”\u4e00\u5200\u5207”\u67b6\u6784\u96be\u4ee5\u5e94\u5bf9\u73b0\u4ee3\u4e1a\u52a1\u573a\u666f\u7684\u5dee\u5f02\u5316\u9700\u6c42\u3002\u5f53TCP\u4e09\u6b21\u63e1\u624b\u9700\u8981\u7ed5\u884c10\u5c42\u534f\u8bae\u6808\u65f6\uff0ceBPF\u901a\u8fc7\u521b\u5efa\u77ed\u8def\u5f84\uff08Short-Circuit\uff09\u5c06\u5904\u7406\u65f6\u5ef6\u538b\u7f29\u4e8680%<\/strong>\u3002\u5176\u6280\u672f\u6838\u5fc3\u5728\u4e8e\uff1a<\/p>\n

    \n
  1. \u5373\u65f6\u7f16\u8bd1\u5668\uff08JIT\uff09<\/strong>\u5c06BPF\u5b57\u8282\u7801\u8f6c\u6362\u4e3a\u672c\u5730\u6307\u4ee4\uff0c\u6d88\u9664\u89e3\u91ca\u5668\u5f00\u9500\n<\/li>\n
  2. Map\u6570\u636e\u7ed3\u6784<\/strong>\u5b9e\u73b0\u7528\u6237\u6001\u4e0e\u5185\u6838\u6001\u7684\u9ad8\u6548\u6570\u636e\u4ea4\u6362\n<\/li>\n
  3. \u9a8c\u8bc1\u5668\uff08Verifier\uff09<\/strong>\u786e\u4fdd\u7a0b\u5e8f\u5b89\u5168\u6267\u884c\uff0c\u5e73\u5747\u68c0\u6d4b2000\u4e07\u6761\u6307\u4ee4\u8def\u5f84\/\u79d2\n<\/li>\n<\/ol>\n

    \u8fd9\u79cd\u67b6\u6784\u521b\u65b0\u4f7f\u5f97\u7f51\u7edc\u5904\u7406\u4ece\u56fa\u5b9a\u7684\u534f\u8bae\u6808\u8f6c\u53d8\u4e3a\u53ef\u7f16\u7a0b\u6570\u636e\u5e73\u9762\u3002\u5fae\u8f6fAzure\u56e2\u961f\u5b9e\u6d4b\u663e\u793a\uff0c\u5728Kubernetes\u670d\u52a1\u7f51\u683c\u573a\u666f\u4e0b\uff0ceBPF\u66ff\u4ee3iptables\u540e\uff0c\u8fde\u63a5\u5efa\u7acb\u901f\u5ea6\u63d0\u5347400%\uff0cCPU\u6d88\u8017\u964d\u4f4e60%<\/strong>\u3002<\/p>\n

    \u4e8c\u3001\u534f\u8bae\u6808\u4f18\u5316\u7684\u4e09\u5927\u5b9e\u8df5\u8def\u5f84<\/h3>\n

    2.1 XDP\u5c42\u5b9e\u73b0\u96f6\u62f7\u8d1d\u5305\u5904\u7406<\/h4>\n

    \u5728\u7f51\u5361\u9a71\u52a8\u5c42\u8fd0\u884c\u7684XDP\uff08eXpress Data Path\uff09\u7a0b\u5e8f<\/strong>\uff0c\u80fd\u591f\u5728\u6570\u636e\u5305\u8fdb\u5165\u534f\u8bae\u6808\u524d\u8fdb\u884c\u8fc7\u6ee4\u548c\u8f6c\u53d1\u3002\u67d0\u5934\u90e8\u4e91\u5382\u5546\u91c7\u7528\u4ee5\u4e0b\u4f18\u5316\u6a21\u5f0f\uff1a<\/p>\n

    SEC("xdp")  \r\nint xdp_redirect(struct xdp_md *ctx) {  \r\nvoid *data_end = (void *)(long)ctx->data_end;  \r\nvoid *data = (void *)(long)ctx->data;  \r\nstruct ethhdr *eth = data;  \r\n  \r\nif (eth + 1 > data_end)  \r\nreturn XDP_ABORTED;  \r\n  \r\nif (eth->h_proto == htons(ETH_P_IP))  \r\nreturn bpf_redirect_map(&tx_port, 0, 0);  \r\n  \r\nreturn XDP_PASS;  \r\n}  \r\n<\/code><\/pre>\n
    \u8fd9\u6bb5\u4ee3\u7801\u5b9e\u73b0\u4e8c\u5c42\u6d41\u91cf\u76f4\u901a\uff0c\u7ed5\u8fc7\u5185\u6838\u7f51\u7edc\u6808\u5904\u7406\uff0c\u5c06\u5ef6\u8fdf\u4ece300\u03bcs\u964d\u81f315\u03bcs<\/strong>\u3002\u914d\u5408DDOS\u9632\u62a4\u89c4\u5219\uff0c\u53ef\u5728\u786c\u4ef6\u5c42\u4e22\u5f03\u653b\u51fb\u6d41\u91cf\u3002<\/p>\n
    2.2 TCP\u534f\u8bae\u6808\u7684\u6df1\u5ea6\u5b9a\u5236<\/h4>\n
    \u901a\u8fc7BPF_PROG_TYPE_SOCK_OPS<\/strong>\u7c7b\u578b\u7a0b\u5e8f\uff0c\u5f00\u53d1\u8005\u80fd\u4ecb\u5165TCP\u72b6\u6001\u673a\uff1a<\/p>\n
    SEC("sockops")  \r\nint bpf_sockmap(struct bpf_sock_ops *skops){  \r\nif (skops->remote_port == 8000) {  \r\nbpf_setsockopt(skops, SOL_TCP, TCP_CONGESTION, "bbr", 3);  \r\nskops->reply = 1;  \r\n}  \r\nreturn 1;  \r\n}  \r\n<\/code><\/pre>\n
    \u8be5\u7a0b\u5e8f\u52a8\u6001\u4e3a\u7279\u5b9a\u7aef\u53e3\u8fde\u63a5\u542f\u7528BBR\u62e5\u585e\u63a7\u5236\u7b97\u6cd5\u3002LinkedIn\u5728\u751f\u4ea7\u73af\u5883\u4e2d\u5e94\u7528\u7c7b\u4f3c\u65b9\u6848\uff0c\u4f7f\u957f\u8ddd\u79bb\u4f20\u8f93\u5e26\u5bbd\u5229\u7528\u7387\u63d0\u534740%\u4ee5\u4e0a<\/strong>\u3002<\/p>\n
    2.3 \u534f\u8bae\u89e3\u6790\u52a0\u901f<\/h4>\n
    \u4f20\u7edf\u534f\u8bae\u89e3\u6790\u4f9d\u8d56\u56fa\u5b9a\u5185\u6838\u8def\u5f84\uff0ceBPF\u5141\u8bb8\u521b\u5efa\u534f\u8bae\u5904\u7406\u6377\u5f84\uff1a<\/p>\n
    SEC("classifier")  \r\nint handle_ingress(struct __sk_buff *skb) {  \r\nstruct iphdr ip = parse_ip(skb);  \r\nif (ip.protocol == IPPROTO_UDP) {  \r\nif (check_custom_proto(skb)) {  \r\nreturn TC_ACT_REDIRECT;  \r\n}  \r\n}  \r\nreturn TC_ACT_OK;  \r\n}  \r\n<\/code><\/pre>\n
    \u8fd9\u79cd\u9884\u5904\u7406\u673a\u5236\u4f7f\u81ea\u5b9a\u4e49\u534f\u8bae\u5904\u7406\u65f6\u5ef6\u964d\u4f4e\u81f3\u7eb3\u79d2\u7ea7\uff0c\u67d0\u91d1\u878d\u4ea4\u6613\u7cfb\u7edf\u901a\u8fc7\u8be5\u65b9\u6848\u5c06\u8ba2\u5355\u5904\u7406\u5ef6\u8fdf\u4ece850\u03bcs\u538b\u7f29\u5230120\u03bcs<\/strong>\u3002<\/p>\n
    \u4e09\u3001\u6027\u80fd\u8c03\u4f18\u7684\u5173\u952e\u6280\u672f\u51b3\u7b56<\/h3>\n
    3.1 \u6570\u636e\u7ed3\u6784\u4f18\u5316\u7b56\u7565<\/h4>\n
      \n
    • BPF_MAP_TYPE_HASH<\/strong>\uff1a\u5b58\u50a8\u52a8\u6001\u4f1a\u8bdd\u72b6\u6001\n<\/li>\n
    • BPF_MAP_TYPE_RINGBUF<\/strong>\uff1a\u5b9e\u73b0\u96f6\u62f7\u8d1d\u4e8b\u4ef6\u901a\u77e5\n<\/li>\n
    • BPF_MAP_TYPE_LRU_HASH<\/strong>\uff1a\u81ea\u52a8\u6e05\u7406\u8fc7\u671f\u6761\u76ee\n<\/li>\n<\/ul>\n
      \u67d0\u89c6\u9891\u6d41\u5a92\u4f53\u5e73\u53f0\u91c7\u7528LRU_HASH\u5b58\u50a8\u64ad\u653e\u4f1a\u8bdd\uff0c\u5185\u5b58\u6d88\u8017\u964d\u4f4e70%\u7684\u540c\u65f6\u4fdd\u630199.99%\u7684\u7f13\u5b58\u547d\u4e2d\u7387<\/strong>\u3002<\/p>\n
      3.2 \u89c2\u6d4b\u6027\u589e\u5f3a\u65b9\u6848<\/h4>\n
      \u901a\u8fc7BPF_PERF_OUTPUT<\/strong>\u5c06\u5185\u6838\u4e8b\u4ef6\u5bfc\u51fa\u5230\u7528\u6237\u7a7a\u95f4\uff1a<\/p>\n
      struct event {  \r\nu32 saddr;  \r\nu32 daddr;  \r\nu64 bytes;  \r\n};  \r\n  \r\nBPF_PERF_OUTPUT(events);  \r\n  \r\nint kprobe__tcp_sendmsg(struct pt_regs *ctx, struct sock *sk) {  \r\nstruct event evt = {};  \r\nevt.saddr = sk->__sk_common.skc_rcv_saddr;  \r\nevt.daddr = sk->__sk_common.skc_daddr;  \r\nevt.bytes = PT_REGS_PARM3(ctx);  \r\nevents.perf_submit(ctx, &evt, sizeof(evt));  \r\nreturn 0;  \r\n}  \r\n<\/code><\/pre>\n
      \u8be5\u63a2\u9488\u5b9e\u65f6\u6355\u83b7TCP\u53d1\u9001\u6570\u636e\uff0c\u5e2e\u52a9\u67d0\u7535\u5546\u5e73\u53f0\u8bc6\u522b\u51fa20%\u7684\u5f02\u5e38\u5927\u5305\u4f20\u8f93\u884c\u4e3a<\/strong>\uff0c\u4f18\u5316\u540eCDN\u6210\u672c\u964d\u4f4e15%\u3002<\/p>\n
      3.3 \u5b89\u5168\u9632\u62a4\u4f53\u7cfb\u6784\u5efa<\/h4>\n
        \n
      • \u8fd0\u884c\u65f6\u9a8c\u8bc1<\/strong>\uff1a\u786e\u4fdd\u7a0b\u5e8f\u4e0d\u5305\u542b\u65e0\u9650\u5faa\u73af\n<\/li>\n
      • \u7279\u6743\u7ea7\u63a7\u5236<\/strong>\uff1a\u901a\u8fc7CAP_BPF\u9650\u5236\u7a0b\u5e8f\u52a0\u8f7d\n<\/li>\n
      • \u7b7e\u540d\u9a8c\u8bc1<\/strong>\uff1a\u91c7\u7528ED25519\u7b97\u6cd5\u8fdb\u884c\u4ee3\u7801\u7b7e\u540d\n<\/li>\n<\/ul>\n
        \u5728\u5bb9\u5668\u7f51\u7edc\u573a\u666f\u4e2d\uff0c\u8fd9\u4e9b\u673a\u5236\u6210\u529f\u62e6\u622a\u4e8692%\u7684\u6076\u610f\u6ce8\u5165\u653b\u51fb\uff0c\u540c\u65f6\u4fdd\u630199.9%\u7684\u5408\u6cd5\u6d41\u91cf\u5904\u7406\u6548\u7387\u3002<\/p>\n
        \u56db\u3001\u751f\u4ea7\u73af\u5883\u90e8\u7f72\u7684\u6700\u4f73\u5b9e\u8df5<\/h3>\n
          \n
        1. \u6e10\u8fdb\u5f0f\u90e8\u7f72\u7b56\u7565<\/strong>\uff1a\u5148\u5728\u76d1\u63a7\u65c1\u8def\u90e8\u7f72\uff0c\u518d\u9010\u6b65\u5207\u5165\u6570\u636e\u8def\u5f84\n<\/li>\n
        2. \u7248\u672c\u63a7\u5236\u65b9\u6848<\/strong>\uff1a\u91c7\u7528BTF\uff08BPF Type Format\uff09\u5b9e\u73b0\u8de8\u5185\u6838\u7248\u672c\u517c\u5bb9\n<\/li>\n
        3. \u6027\u80fd\u57fa\u7ebf\u5efa\u7acb<\/strong>\uff1a\u4f7f\u7528pixie\u8fdb\u884c\u5b9e\u65f6\u6027\u80fd\u5bf9\u6bd4\u5206\u6790\n<\/li>\n
        4. \u6545\u969c\u7194\u65ad\u673a\u5236<\/strong>\uff1a\u8bbe\u7f6eCPU\u4f7f\u7528\u7387\u9608\u503c\u81ea\u52a8\u5378\u8f7dBPF\u7a0b\u5e8f\n<\/li>\n<\/ol>\n
          \u67d0\u667a\u6167\u57ce\u5e02\u9879\u76ee\u91c7\u7528\u84dd\u7eff\u90e8\u7f72\u6a21\u5f0f\uff0c\u57283\u4e2a\u6708\u5185\u5b8c\u62102000+\u8282\u70b9\u7684\u534f\u8bae\u6808\u5347\u7ea7\uff0c\u671f\u95f4\u670d\u52a1\u4e2d\u65ad\u65f6\u95f4\u4e3a\u96f6\u3002\u901a\u8fc7BPF CO-RE\uff08Compile Once – Run Everywhere\uff09<\/strong>\u6280\u672f\uff0c\u540c\u4e00\u5b57\u8282\u7801\u7a0b\u5e8f\u5728\u4e0d\u540c\u5185\u6838\u7248\u672c\u4e0a\u5b9e\u73b0\u65e0\u7f1d\u8fd0\u884c\u3002<\/p>\n
          \u7f51\u7edc\u534f\u8bae\u6808\u4f18\u5316\u5df2\u8fdb\u5165“\u5fae\u79d2\u7ea7\u4e89\u593a\u6218”<\/strong>\u9636\u6bb5\uff0ceBPF\u63d0\u4f9b\u7684\u53ef\u7f16\u7a0b\u6027\u6b63\u5728\u91cd\u5851\u7f51\u7edc\u6570\u636e\u5904\u7406\u8303\u5f0f\u3002\u5f53\u7a0b\u5e8f\u5458\u53ef\u4ee5\u50cf\u8c03\u8bd5\u7528\u6237\u6001\u5e94\u7528\u90a3\u6837\u89c2\u5bdf\u548c\u4fee\u6539\u5185\u6838<\/p>\n","protected":false},"excerpt":{"rendered":"
          \u5728\u6570\u636e\u4e2d\u5fc3\u541e\u5410\u91cf\u7a81\u7834\u767e\u4e07QPS\u7684\u65f6\u4ee3\uff0c\u7f51\u7edc\u5ef6\u8fdf\u6bcf\u964d\u4f4e1\u5fae\u79d2\u90fd\u610f\u5473\u7740\u5343\u4e07\u7ea7\u6210\u672c\u8282\u7701\u3002\u5f53\u4f20\u7edf\u5185\u6838\u4f18\u5316\u906d\u9047\u6027\u80fd\u74f6\u9888\uff0c\u4e00\u9879\u6e90\u81eaBSD\u6570\u636e\u5305\u8fc7\u6ee4\u5668\u7684\u6280\u672f\u6b63\u5728\u5f15\u53d1\u7f51\u7edc\u534f\u8bae\u6808\u7684\u9769\u547d\u2014\u2014eBPF\u901a\u8fc7\u52a8\u6001\u6ce8\u5165\u5b89\u5168\u53ef\u63a7\u7684\u6c99\u76d2\u7a0b\u5e8f\uff0c\u4f7f\u5f00\u53d1\u8005\u80fd\u591f\u5728\u4e0d\u91cd\u65b0\u7f16\u8bd1\u5185\u6838\u7684\u524d\u63d0\u4e0b\uff0c\u5bf9\u7f51\u7edc\u6570\u636e\u8def\u5f84\u8fdb\u884c\u6df1\u5ea6\u5b9a\u5236\u3002\u8fd9\u79cd\u7a81\u7834\u6027\u7684\u6280\u672f\u8303\u5f0f\uff0c\u6b63\u5728\u5e2e\u52a9Cloudflare\u5b9e\u73b0\u5168\u7403\u8fb9\u7f18\u7f51\u7edc\u7684\u96f6\u4e22\u5305\u8f6c\u53d1\uff0c\u652f\u6491Facebook\u767e\u4e07\u7ea7\u670d\u52a1\u5668\u96c6\u7fa4\u7684\u667a\u80fd\u6d41\u91cf\u8c03\u5ea6\u3002 \u4e00\u3001eBPF\u6280\u672f\u5185\u6838\u4e0e\u7f51\u7edc\u6027\u80fd\u74f6\u9888\u7a81\u7834 \u4f20\u7edf\u7f51\u7edc\u534f\u8bae\u6808\u7684”\u4e00\u5200\u5207”\u67b6\u6784\u96be\u4ee5\u5e94\u5bf9\u73b0\u4ee3\u4e1a\u52a1\u573a\u666f\u7684\u5dee\u5f02\u5316\u9700\u6c42\u3002\u5f53TCP\u4e09\u6b21\u63e1\u624b\u9700\u8981\u7ed5\u884c10\u5c42\u534f\u8bae\u6808\u65f6\uff0ceBPF\u901a\u8fc7\u521b\u5efa\u77ed\u8def\u5f84\uff08Short-Circuit\uff09\u5c06\u5904\u7406\u65f6\u5ef6\u538b\u7f29\u4e8680%\u3002\u5176\u6280\u672f\u6838\u5fc3\u5728\u4e8e\uff1a \u5373\u65f6\u7f16\u8bd1\u5668\uff08JIT\uff09\u5c06BPF\u5b57\u8282\u7801\u8f6c\u6362\u4e3a\u672c\u5730\u6307\u4ee4\uff0c\u6d88\u9664\u89e3\u91ca\u5668\u5f00\u9500 Map\u6570\u636e\u7ed3\u6784\u5b9e\u73b0\u7528\u6237\u6001\u4e0e\u5185\u6838\u6001\u7684\u9ad8\u6548\u6570\u636e\u4ea4\u6362 \u9a8c\u8bc1\u5668\uff08Verifier\uff09\u786e\u4fdd\u7a0b\u5e8f\u5b89\u5168\u6267\u884c\uff0c\u5e73\u5747\u68c0\u6d4b2000\u4e07\u6761\u6307\u4ee4\u8def\u5f84\/\u79d2 \u8fd9\u79cd\u67b6\u6784\u521b\u65b0\u4f7f\u5f97\u7f51\u7edc\u5904\u7406\u4ece\u56fa\u5b9a\u7684\u534f\u8bae\u6808\u8f6c\u53d8\u4e3a\u53ef\u7f16\u7a0b\u6570\u636e\u5e73\u9762\u3002\u5fae\u8f6fAzure\u56e2\u961f\u5b9e\u6d4b\u663e\u793a\uff0c\u5728Kubernetes\u670d\u52a1\u7f51\u683c\u573a\u666f\u4e0b\uff0ceBPF\u66ff\u4ee3iptables\u540e\uff0c\u8fde\u63a5\u5efa\u7acb\u901f\u5ea6\u63d0\u5347400%\uff0cCPU\u6d88\u8017\u964d\u4f4e60%\u3002 \u4e8c\u3001\u534f\u8bae\u6808\u4f18\u5316\u7684\u4e09\u5927\u5b9e\u8df5\u8def\u5f84 2.1 XDP\u5c42\u5b9e\u73b0\u96f6\u62f7\u8d1d\u5305\u5904\u7406 \u5728\u7f51\u5361\u9a71\u52a8\u5c42\u8fd0\u884c\u7684XDP\uff08eXpress Data Path\uff09\u7a0b\u5e8f\uff0c\u80fd\u591f\u5728\u6570\u636e\u5305\u8fdb\u5165\u534f\u8bae\u6808\u524d\u8fdb\u884c\u8fc7\u6ee4\u548c\u8f6c\u53d1\u3002\u67d0\u5934\u90e8\u4e91\u5382\u5546\u91c7\u7528\u4ee5\u4e0b\u4f18\u5316\u6a21\u5f0f\uff1a SEC("xdp") int xdp_redirect(struct xdp_md *ctx) { void *data_end = (void *)(long)ctx->data_end; void *data = (void *)(long)ctx->data; struct ethhdr *eth = data; if (eth + 1 > data_end) return XDP_ABORTED; if (eth->h_proto == htons(ETH_P_IP)) return bpf_redirect_map(&tx_port, 0, 0); return XDP_PASS; } \u8fd9\u6bb5\u4ee3\u7801\u5b9e\u73b0\u4e8c\u5c42\u6d41\u91cf\u76f4\u901a\uff0c\u7ed5\u8fc7\u5185\u6838\u7f51\u7edc\u6808\u5904\u7406\uff0c\u5c06\u5ef6\u8fdf\u4ece300\u03bcs\u964d\u81f315\u03bcs\u3002\u914d\u5408DDOS\u9632\u62a4\u89c4\u5219\uff0c\u53ef\u5728\u786c\u4ef6\u5c42\u4e22\u5f03\u653b\u51fb\u6d41\u91cf\u3002 2.2 […]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[],"class_list":["post-37110","post","type-post","status-publish","format-standard","hentry","category-product-news"],"_links":{"self":[{"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts\/37110","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\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/comments?post=37110"}],"version-history":[{"count":1,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts\/37110\/revisions"}],"predecessor-version":[{"id":37112,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts\/37110\/revisions\/37112"}],"wp:attachment":[{"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/media?parent=37110"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/categories?post=37110"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/tags?post=37110"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}