{"id":208399,"date":"2025-09-10T15:34:11","date_gmt":"2025-09-10T07:34:11","guid":{"rendered":"https:\/\/www.server.hk\/blog\/?p=208399"},"modified":"2025-09-10T15:34:11","modified_gmt":"2025-09-10T07:34:11","slug":"%e6%b7%b1%e5%85%a5%e8%a7%a3%e6%9e%90-linux-%e5%86%85%e6%a0%b8%e7%bd%91%e7%bb%9c%e6%a0%88%e6%a0%b8%e5%bf%83%e7%bb%93%e6%9e%84%e4%bb%a5%e4%bc%98%e5%8c%96%e7%bd%91%e7%bb%9c%e6%80%a7%e8%83%bd","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/208399\/","title":{"rendered":"\u6df1\u5165\u89e3\u6790 Linux \u5185\u6838\u7f51\u7edc\u6808\u6838\u5fc3\u7ed3\u6784\u4ee5\u4f18\u5316\u7f51\u7edc\u6027\u80fd"},"content":{"rendered":"<p dir=\"auto\">Linux \u5185\u6838\u7f51\u7edc\u6808\u662f\u5904\u7406\u7f51\u7edc\u901a\u4fe1\u7684\u5173\u952e\u7ec4\u4ef6\uff0c\u80fd\u591f\u9ad8\u6548\u3001\u53ef\u9760\u5730\u5b9e\u73b0\u8de8\u534f\u8bae\u7684\u6570\u636e\u4f20\u8f93\u3002\u672c\u6587\u8be6\u7ec6\u4ecb\u7ecd Linux \u5185\u6838\u7f51\u7edc\u6808\u4e2d\u7684\u6838\u5fc3\u6570\u636e\u7ed3\u6784\uff0c\u5305\u62ec socket\u3001sock\u3001sk_buff\u3001device \u4ee5\u53ca\u5173\u952e\u534f\u8bae\u5934\uff08\u5982 tcphdr\u3001iphdr\u3001ethhdr \u548c arphdr\uff09\u3002\u672c\u6587\u9762\u5411\u6280\u672f\u53d7\u4f17\uff0c\u91c7\u7528\u4e13\u4e1a IT \u8bed\u6c14\uff0c\u63d0\u4f9b\u51c6\u786e\u3001\u8be6\u5c3d\u4e14\u5b9e\u7528\u7684\u4fe1\u606f\uff0c\u65e8\u5728\u5e2e\u52a9\u5f00\u53d1\u8005\u4f18\u5316\u7f51\u7edc\u76f8\u5173\u7684\u5f00\u53d1\u5de5\u4f5c\u3002<\/p>\n<h2 dir=\"auto\">Linux \u5185\u6838\u7f51\u7edc\u6808\u6982\u8ff0<\/h2>\n<p dir=\"auto\">Linux \u5185\u6838\u7f51\u7edc\u6808\u901a\u8fc7\u5206\u5c42\u62bd\u8c61\u7ba1\u7406\u7f51\u7edc\u6570\u636e\u6d41\uff0c\u4ece\u786c\u4ef6\u63a5\u53e3\u5230\u5e94\u7528\u5c42\u5957\u63a5\u5b57\u5747\u6709\u6d89\u53ca\u3002\u6bcf\u5c42\u4f9d\u8d56\u7279\u5b9a\u7684\u6570\u636e\u7ed3\u6784\u6765\u5b8c\u6210\u6570\u636e\u5305\u7684\u521b\u5efa\u3001\u4f20\u8f93\u548c\u8def\u7531\u7b49\u4efb\u52a1\u3002\u4ee5\u4e0b\u5c06\u8be6\u7ec6\u63a2\u8ba8\u8fd9\u4e9b\u6838\u5fc3\u7ed3\u6784\u7684\u529f\u80fd\u53ca\u5176\u76f8\u4e92\u5173\u7cfb\uff0c\u786e\u4fdd\u6280\u672f\u5185\u5bb9\u7684\u51c6\u786e\u6027\u548c\u6e05\u6670\u5ea6\uff0c\u65b9\u4fbf\u5f00\u53d1\u8005\u548c\u7cfb\u7edf\u7ba1\u7406\u5458\u7406\u89e3\u3002<\/p>\n<h2 dir=\"auto\">Linux \u5185\u6838\u7f51\u7edc\u6808\u7684\u6838\u5fc3\u6570\u636e\u7ed3\u6784<\/h2>\n<h3 dir=\"auto\">1. socket \u7ed3\u6784<\/h3>\n<p dir=\"auto\">socket \u7ed3\u6784\u5b9a\u4e49\u5728 include\/linux\/socket.h \u4e2d\uff0c\u662f BSD \u5957\u63a5\u5b57\u7684\u4e3b\u8981\u63a5\u53e3\uff0c\u8fde\u63a5\u7528\u6237\u7a7a\u95f4\u5e94\u7528\u7a0b\u5e8f\u4e0e\u5185\u6838\u7f51\u7edc\u5c42\u3002\u5b83\u4e3b\u8981\u7528\u4e8e BSD \u5957\u63a5\u5b57\u5c42\uff0c\u4f46\u5728 INET \u5957\u63a5\u5b57\u5c42\u4e2d\u4e5f\u6709\u5c11\u91cf\u5e94\u7528\u3002<\/p>\n<h4 dir=\"auto\">socket \u7ed3\u6784\u7684\u4e3b\u8981\u5b57\u6bb5<\/h4>\n<ul dir=\"auto\">\n<li><strong>type<\/strong>\uff1a\u6307\u5b9a\u5957\u63a5\u5b57\u7c7b\u578b\uff0c\u4f8b\u5982 SOCK_STREAM\uff08\u7528\u4e8e TCP\uff09\u6216 SOCK_DGRAM\uff08\u7528\u4e8e UDP\uff09\u3002<\/li>\n<li><strong>state<\/strong>\uff1a\u8bb0\u5f55\u5957\u63a5\u5b57\u72b6\u6001\uff0c\u5982 SS_CONNECTED\uff08\u5df2\u8fde\u63a5\uff09\u6216 SS_DISCONNECTED\uff08\u672a\u8fde\u63a5\uff09\u3002<\/li>\n<li><strong>flags<\/strong>\uff1a\u4fdd\u7559\u7528\u4e8e\u5957\u63a5\u5b57\u7279\u5b9a\u6807\u5fd7\uff0c\u4f46\u5728\u73b0\u4ee3\u5185\u6838\u4e2d\u7528\u9014\u6709\u9650\u3002<\/li>\n<li><strong>ops<\/strong>\uff1a\u6307\u5411 proto_ops \u7ed3\u6784\uff0c\u5305\u542b\u5957\u63a5\u5b57\u64cd\u4f5c\u7684\u51fd\u6570\u6307\u9488\uff08\u5982 bind\u3001connect\uff09\u3002<\/li>\n<li><strong>data<\/strong>\uff1a\u6307\u5411\u534f\u8bae\u7279\u5b9a\u7684\u6570\u636e\u7ed3\u6784\uff0c\u4f8b\u5982 INET \u5957\u63a5\u5b57\u6307\u5411 sock \u7ed3\u6784\uff0cUNIX \u57df\u5957\u63a5\u5b57\u6307\u5411 unix_proto_data \u7ed3\u6784\u3002<\/li>\n<li><strong>conn\u3001iconn\u3001next<\/strong>\uff1a\u7528\u4e8e UNIX \u57df\u5957\u63a5\u5b57\u7684\u8fde\u63a5\u7ba1\u7406\u548c\u94fe\u8868\u7ec4\u7ec7\u3002<\/li>\n<li><strong>wait<\/strong>\uff1a\u7ba1\u7406 I\/O \u64cd\u4f5c\u7684\u7b49\u5f85\u961f\u5217\u3002<\/li>\n<li><strong>inode<\/strong>\uff1a\u5173\u8054\u6587\u4ef6\u7cfb\u7edf\u7684 inode\u3002<\/li>\n<li><strong>fasync_list<\/strong>\uff1a\u652f\u6301\u5f02\u6b65 I\/O \u901a\u77e5\u3002<\/li>\n<\/ul>\n<h4 dir=\"auto\">\u7528\u9014<\/h4>\n<p dir=\"auto\">socket \u7ed3\u6784\u8d1f\u8d23\u521d\u59cb\u5316\u548c\u7ba1\u7406\u5957\u63a5\u5b57\u8fde\u63a5\uff0c\u662f\u7f51\u7edc\u901a\u4fe1\u7684\u9876\u5c42\u62bd\u8c61\u63a5\u53e3\u3002<\/p>\n<h3 dir=\"auto\">2. sock \u7ed3\u6784<\/h3>\n<p dir=\"auto\">\u5b9a\u4e49\u5728 include\/linux\/net.h \u4e2d\uff0csock \u7ed3\u6784\u7528\u9014\u5e7f\u6cdb\uff0c\u8986\u76d6\u786c\u4ef6\u5c42\u3001\u8bbe\u5907\u63a5\u53e3\u5c42\u3001IP \u5c42\u548c INET \u5957\u63a5\u5b57\u5c42\u3002\u5b83\u662f\u5404\u5c42\u4e4b\u95f4\u7684\u7ebd\u5e26\uff0c\u4e3b\u8981\u7528\u4e8e\u7ba1\u7406\u6570\u636e\u5305\u7f13\u51b2\u548c\u534f\u8bae\u64cd\u4f5c\uff0c\u7279\u522b\u662f\u5728 TCP \u534f\u8bae\u4e2d\u3002<\/p>\n<h4 dir=\"auto\">sock \u7ed3\u6784\u7684\u4e3b\u8981\u5b57\u6bb5<\/h4>\n<ul dir=\"auto\">\n<li><strong>wmem_alloc\u3001rmem_alloc<\/strong>\uff1a\u5206\u522b\u8bb0\u5f55\u53d1\u9001\u548c\u63a5\u6536\u7f13\u51b2\u961f\u5217\u4e2d\u7684\u6570\u636e\u5927\u5c0f\u3002<\/li>\n<li><strong>rcvbuf\u3001sndbuf<\/strong>\uff1a\u5b9a\u4e49\u63a5\u6536\u548c\u53d1\u9001\u7f13\u51b2\u533a\u7684\u6700\u5927\u5bb9\u91cf\u3002<\/li>\n<li><strong>write_seq\u3001sent_seq\u3001acked_seq\u3001copied_seq\u3001rcv_ack_seq<\/strong>\uff1a\u7528\u4e8e TCP \u534f\u8bae\u7684\u5e8f\u5217\u53f7\uff0c\u786e\u4fdd\u53ef\u9760\u6570\u636e\u4f20\u8f93\u3002<\/li>\n<li><strong>urg_seq\u3001urg_data<\/strong>\uff1a\u5904\u7406 TCP \u7d27\u6025\u6570\u636e\u3002<\/li>\n<li><strong>inuse\u3001dead\u3001urginline\u3001nonagle<\/strong>\uff1a\u63a7\u5236\u6807\u5fd7\uff0c\u7528\u4e8e\u7ba1\u7406\u5957\u63a5\u5b57\u72b6\u6001\u3001\u7d27\u6025\u6570\u636e\u5904\u7406\u53ca TCP \u9009\u9879\uff08\u5982\u7981\u7528 Nagle \u7b97\u6cd5\uff09\u3002<\/li>\n<li><strong>send_head\u3001send_tail\u3001back_log<\/strong>\uff1a\u7ba1\u7406\u53d1\u9001\u548c\u63a5\u6536\u6570\u636e\u5305\u961f\u5217\u3002<\/li>\n<li><strong>prot<\/strong>\uff1a\u6307\u5411\u534f\u8bae\u7279\u5b9a\u7684\u5904\u7406\u51fd\u6570\u96c6\u3002<\/li>\n<li><strong>daddr\u3001saddr<\/strong>\uff1a\u5b58\u50a8\u76ee\u6807\u548c\u6e90 IP \u5730\u5740\u3002<\/li>\n<li><strong>mtu\u3001mss\u3001max_window<\/strong>\uff1a\u5b9a\u4e49\u6700\u5927\u4f20\u8f93\u5355\u5143\u3001\u5206\u6bb5\u5927\u5c0f\u548c\u7a97\u53e3\u5927\u5c0f\u3002<\/li>\n<li><strong>cong_window\u3001cong_count\u3001ssthresh<\/strong>\uff1a\u652f\u6301 TCP \u62e5\u585e\u63a7\u5236\u7b97\u6cd5\u3002<\/li>\n<li><strong>keepalive_timer\u3001retransmit_timer\u3001ack_timer<\/strong>\uff1a\u7ba1\u7406 TCP \u8d85\u65f6\u548c\u91cd\u4f20\u3002<\/li>\n<\/ul>\n<h4 dir=\"auto\">\u7528\u9014<\/h4>\n<p dir=\"auto\">sock \u7ed3\u6784\u4e0e socket \u7ed3\u6784\u7ed1\u5b9a\uff0c\u8d1f\u8d23\u6570\u636e\u5305\u7f13\u51b2\u548c\u534f\u8bae\u64cd\u4f5c\uff0c\u662f\u5b9e\u73b0\u53ef\u9760\u6570\u636e\u4f20\u8f93\uff08\u7279\u522b\u662f TCP\uff09\u7684\u6838\u5fc3\u3002<\/p>\n<h3 dir=\"auto\">3. sk_buff \u7ed3\u6784<\/h3>\n<p dir=\"auto\">sk_buff \u7ed3\u6784\u5b9a\u4e49\u5728 include\/linux\/skbuff.h \u4e2d\uff0c\u662f\u5185\u6838\u4e2d\u7f51\u7edc\u6570\u636e\u5305\u7684\u8868\u793a\u5f62\u5f0f\uff0c\u7528\u4e8e\u5728\u534f\u8bae\u6808\u5404\u5c42\u4e2d\u5904\u7406\u6570\u636e\u5305\u3002<\/p>\n<h4 dir=\"auto\">sk_buff \u7ed3\u6784\u7684\u4e3b\u8981\u5b57\u6bb5<\/h4>\n<ul dir=\"auto\">\n<li><strong>next\u3001prev<\/strong>\uff1a\u7ec4\u6210\u6570\u636e\u5305\u961f\u5217\u7684\u53cc\u5411\u94fe\u8868\u3002<\/li>\n<li><strong>sk<\/strong>\uff1a\u5f15\u7528\u5173\u8054\u7684 sock \u7ed3\u6784\u3002<\/li>\n<li><strong>when\u3001stamp<\/strong>\uff1a\u8bb0\u5f55\u6570\u636e\u5305\u65f6\u95f4\u6233\uff0c\u7528\u4e8e\u8ba1\u7b97\u5f80\u8fd4\u65f6\u95f4\uff08RTT\uff09\u3002<\/li>\n<li><strong>dev<\/strong>\uff1a\u6807\u8bc6\u5904\u7406\u6570\u636e\u5305\u7684\u7f51\u7edc\u8bbe\u5907\u3002<\/li>\n<li><strong>h<\/strong>\uff1a\u8054\u5408\u4f53\uff0c\u5305\u542b\u6307\u5411\u534f\u8bae\u5934\u7684\u6307\u9488\uff08\u5982 th \u6307\u5411 TCP \u5934\uff0ciph \u6307\u5411 IP \u5934\uff0ceth \u6307\u5411\u4ee5\u592a\u7f51\u5934\uff09\u3002<\/li>\n<li><strong>data<\/strong>\uff1a\u6307\u5411\u6570\u636e\u5305\u7684\u6709\u6548\u8f7d\u8377\uff0c\u5185\u5bb9\u968f\u534f\u8bae\u5c42\u53d8\u5316\u3002\u4f8b\u5982\uff1a\n<ul dir=\"auto\">\n<li>\u4f20\u8f93\u5c42\uff1a\u6307\u5411 TCP \u5934 + \u6709\u6548\u8f7d\u8377\u3002<\/li>\n<li>\u7f51\u7edc\u5c42\uff1a\u6307\u5411 IP \u5934 + TCP \u5934 + \u6709\u6548\u8f7d\u8377\u3002<\/li>\n<li>\u94fe\u8def\u5c42\uff1a\u6307\u5411 MAC \u5934 + IP \u5934 + TCP \u5934 + \u6709\u6548\u8f7d\u8377\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>len\u3001mem_len\u3001truesize<\/strong>\uff1a\u8bb0\u5f55\u6570\u636e\u90e8\u5206\u957f\u5ea6\u548c\u603b\u5185\u5b58\u4f7f\u7528\u91cf\u3002<\/li>\n<li><strong>saddr\u3001daddr\u3001raddr<\/strong>\uff1a\u5b58\u50a8\u6e90\u3001\u76ee\u6807\u548c\u4e0b\u4e00\u8df3 IP \u5730\u5740\u3002<\/li>\n<li><strong>acked\u3001used\u3001free\u3001arp<\/strong>\uff1a\u6807\u5fd7\u4f4d\uff0c\u7528\u4e8e\u6570\u636e\u5305\u786e\u8ba4\u3001\u91ca\u653e\u548c MAC \u5934\u72b6\u6001\u3002<\/li>\n<\/ul>\n<h4 dir=\"auto\">\u7528\u9014<\/h4>\n<p dir=\"auto\">sk_buff \u7ed3\u6784\u662f\u6570\u636e\u5305\u5904\u7406\u7684\u6838\u5fc3\uff0c\u63d0\u4f9b\u8de8\u5c42\u6570\u636e\u64cd\u4f5c\u7684\u7edf\u4e00\u63a5\u53e3\u3002\u5176 data \u6307\u9488\u52a8\u6001\u8c03\u6574\uff0c\u6307\u5411\u5f53\u524d\u534f\u8bae\u5c42\u7684\u5934\u90e8\u548c\u8f7d\u8377\u3002<\/p>\n<h3 dir=\"auto\">4. device \u7ed3\u6784<\/h3>\n<p dir=\"auto\">\u5b9a\u4e49\u5728 include\/linux\/netdevice.h \u4e2d\uff0cdevice \u7ed3\u6784\u8868\u793a\u7f51\u7edc\u63a5\u53e3\uff0c\u5305\u542b\u786c\u4ef6\u548c\u914d\u7f6e\u4fe1\u606f\u3002<\/p>\n<h4 dir=\"auto\">device \u7ed3\u6784\u7684\u4e3b\u8981\u5b57\u6bb5<\/h4>\n<ul dir=\"auto\">\n<li><strong>name<\/strong>\uff1a\u7f51\u7edc\u63a5\u53e3\u540d\u79f0\uff08\u5982 eth0\uff09\u3002<\/li>\n<li><strong>rmem_start\u3001rmem_end\u3001mem_start\u3001mem_end<\/strong>\uff1a\u5b9a\u4e49\u6570\u636e\u5305\u7f13\u51b2\u7684\u5171\u4eab\u5185\u5b58\u533a\u57df\u3002<\/li>\n<li><strong>base_addr\u3001irq\u3001dma<\/strong>\uff1a\u6307\u5b9a I\/O \u57fa\u5730\u5740\u3001\u4e2d\u65ad\u53f7\u548c DMA \u901a\u9053\u3002<\/li>\n<li><strong>start\u3001tbusy\u3001interrupt<\/strong>\uff1a\u6807\u5fd7\u4f4d\uff0c\u8868\u793a\u8bbe\u5907\u72b6\u6001\uff08\u5982\u8fd0\u884c\u3001\u5fd9\u788c\u6216\u5904\u7406\u4e2d\u65ad\uff09\u3002<\/li>\n<li><strong>init\u3001open\u3001stop\u3001hard_start_xmit<\/strong>\uff1a\u8bbe\u5907\u521d\u59cb\u5316\u3001\u542f\u52a8\u3001\u505c\u6b62\u548c\u6570\u636e\u5305\u53d1\u9001\u7684\u51fd\u6570\u6307\u9488\u3002<\/li>\n<li><strong>mtu\u3001type\u3001hard_header_len<\/strong>\uff1a\u5b9a\u4e49\u6700\u5927\u4f20\u8f93\u5355\u5143\u3001\u786c\u4ef6\u7c7b\u578b\u548c\u5934\u90e8\u957f\u5ea6\u3002<\/li>\n<li><strong>broadcast\u3001dev_addr<\/strong>\uff1a\u5b58\u50a8\u786c\u4ef6\u5e7f\u64ad\u5730\u5740\u548c\u8bbe\u5907\u5730\u5740\u3002<\/li>\n<li><strong>pa_addr\u3001pa_brdaddr\u3001pa_mask<\/strong>\uff1a\u7ba1\u7406\u534f\u8bae\u5c42\u7684 IP \u5730\u5740\u548c\u7f51\u7edc\u63a9\u7801\u3002<\/li>\n<li><strong>buffs<\/strong>\uff1a\u5b58\u50a8\u5f85\u53d1\u9001\u6570\u636e\u5305\u7684\u961f\u5217\u3002<\/li>\n<\/ul>\n<h4 dir=\"auto\">\u7528\u9014<\/h4>\n<p dir=\"auto\">device \u7ed3\u6784\u8d1f\u8d23\u7ba1\u7406\u7f51\u7edc\u63a5\u53e3\uff0c\u4fc3\u8fdb\u5185\u6838\u4e0e\u786c\u4ef6\u8bbe\u5907\u4e4b\u95f4\u7684\u901a\u4fe1\u3002<\/p>\n<h2 dir=\"auto\">\u534f\u8bae\u5934\u7ed3\u6784<\/h2>\n<h3 dir=\"auto\">5. TCP \u5934\u90e8 (tcphdr)<\/h3>\n<p dir=\"auto\">tcphdr \u7ed3\u6784\u5b9a\u4e49\u5728 include\/linux\/tcp.h \u4e2d\uff0c\u8868\u793a TCP \u5934\u90e8\u683c\u5f0f\u3002<\/p>\n<h4 dir=\"auto\">\u4e3b\u8981\u5b57\u6bb5<\/h4>\n<ul dir=\"auto\">\n<li><strong>source\u3001dest<\/strong>\uff1a\u6e90\u548c\u76ee\u6807\u7aef\u53e3\u53f7\u3002<\/li>\n<li><strong>seq\u3001ack_seq<\/strong>\uff1a\u5e8f\u5217\u53f7\u548c\u786e\u8ba4\u53f7\uff0c\u7528\u4e8e\u53ef\u9760\u6570\u636e\u4f20\u8f93\u3002<\/li>\n<li><strong>doff<\/strong>\uff1a\u6570\u636e\u504f\u79fb\u91cf\uff08\u5934\u90e8\u957f\u5ea6\uff0c\u5355\u4f4d\u4e3a 32 \u4f4d\u5b57\uff09\u3002<\/li>\n<li><strong>fin\u3001syn\u3001rst\u3001psh\u3001ack\u3001urg<\/strong>\uff1a\u63a7\u5236\u6807\u5fd7\uff0c\u7528\u4e8e\u8fde\u63a5\u7ba1\u7406\u3002<\/li>\n<li><strong>window<\/strong>\uff1a\u901a\u544a\u7a97\u53e3\u5927\u5c0f\u3002<\/li>\n<li><strong>check<\/strong>\uff1a\u6821\u9a8c\u548c\uff0c\u786e\u4fdd\u6570\u636e\u5b8c\u6574\u6027\u3002<\/li>\n<li><strong>urg_ptr<\/strong>\uff1a\u7d27\u6025\u6307\u9488\uff0c\u7528\u4e8e\u5e26\u5916\u6570\u636e\u3002<\/li>\n<\/ul>\n<h3 dir=\"auto\">6. IP \u5934\u90e8 (iphdr)<\/h3>\n<p dir=\"auto\">iphdr \u7ed3\u6784\u5b9a\u4e49\u5728 include\/linux\/ip.h \u4e2d\uff0c\u8868\u793a IP \u5934\u90e8\u683c\u5f0f\u3002<\/p>\n<h4 dir=\"auto\">\u4e3b\u8981\u5b57\u6bb5<\/h4>\n<ul dir=\"auto\">\n<li><strong>version\u3001ihl<\/strong>\uff1aIP \u7248\u672c\u548c\u5934\u90e8\u957f\u5ea6\u3002<\/li>\n<li><strong>tos<\/strong>\uff1a\u670d\u52a1\u7c7b\u578b\uff0c\u7528\u4e8e\u6570\u636e\u5305\u4f18\u5148\u7ea7\u548c\u670d\u52a1\u7c7b\u578b\u3002<\/li>\n<li><strong>tot_len<\/strong>\uff1a\u6570\u636e\u5305\u603b\u957f\u5ea6\uff08\u5934\u90e8 + \u6570\u636e\uff09\u3002<\/li>\n<li><strong>id\u3001frag_off<\/strong>\uff1a\u6570\u636e\u5305\u6807\u8bc6\u7b26\u548c\u5206\u7247\u504f\u79fb\u3002<\/li>\n<li><strong>ttl<\/strong>\uff1a\u751f\u5b58\u65f6\u95f4\uff0c\u63a7\u5236\u6570\u636e\u5305\u5728\u7f51\u7edc\u4e2d\u7684\u8def\u7531\u8df3\u6570\u3002<\/li>\n<li><strong>protocol<\/strong>\uff1a\u4e0a\u5c42\u534f\u8bae\u7c7b\u578b\uff08\u5982 TCP\u3001UDP\uff09\u3002<\/li>\n<li><strong>check<\/strong>\uff1a\u5934\u90e8\u6821\u9a8c\u548c\u3002<\/li>\n<li><strong>saddr\u3001daddr<\/strong>\uff1a\u6e90\u548c\u76ee\u6807 IP \u5730\u5740\u3002<\/li>\n<\/ul>\n<h3 dir=\"auto\">7. \u4ee5\u592a\u7f51\u5e27\u5934\u90e8 (ethhdr)<\/h3>\n<p dir=\"auto\">ethhdr \u7ed3\u6784\u5b9a\u4e49\u5728 include\/linux\/if_ether.h \u4e2d\uff0c\u8868\u793a\u4ee5\u592a\u7f51\u5e27\u5934\u90e8\u3002<\/p>\n<h4 dir=\"auto\">\u4e3b\u8981\u5b57\u6bb5<\/h4>\n<ul dir=\"auto\">\n<li><strong>h_dest\u3001h_source<\/strong>\uff1a\u76ee\u6807\u548c\u6e90 MAC \u5730\u5740\u3002<\/li>\n<li><strong>h_proto<\/strong>\uff1a\u534f\u8bae\u7c7b\u578b\uff08\u5982 IP\u3001ARP\uff09\u3002<\/li>\n<\/ul>\n<h3 dir=\"auto\">8. ARP \u5934\u90e8 (arphdr)<\/h3>\n<p dir=\"auto\">arphdr \u7ed3\u6784\u5b9a\u4e49\u5728 include\/linux\/if_arp.h \u4e2d\uff0c\u8868\u793a ARP \u6570\u636e\u5305\u5934\u90e8\u3002<\/p>\n<h4 dir=\"auto\">\u4e3b\u8981\u5b57\u6bb5<\/h4>\n<ul dir=\"auto\">\n<li><strong>ar_hrd\u3001ar_pro<\/strong>\uff1a\u786c\u4ef6\u548c\u534f\u8bae\u7c7b\u578b\u3002<\/li>\n<li><strong>ar_hln\u3001ar_pln<\/strong>\uff1a\u786c\u4ef6\u548c\u534f\u8bae\u5730\u5740\u957f\u5ea6\u3002<\/li>\n<li><strong>ar_op<\/strong>\uff1aARP \u64cd\u4f5c\u7801\uff08\u5982\u8bf7\u6c42\u3001\u54cd\u5e94\uff09\u3002<\/li>\n<li><strong>ar_sha\u3001ar_sip\u3001ar_tha\u3001ar_tip<\/strong>\uff1a\u6e90\u548c\u76ee\u6807 MAC \u5730\u5740\u53ca IP \u5730\u5740\u3002<\/li>\n<\/ul>\n<h2 dir=\"auto\">\u7ed3\u6784\u4e4b\u95f4\u7684\u76f8\u4e92\u5173\u7cfb<\/h2>\n<p dir=\"auto\">socket \u548c sock \u7ed3\u6784\u534f\u4f5c\u7ba1\u7406\u5957\u63a5\u5b57\u64cd\u4f5c\u548c\u6570\u636e\u5305\u7f13\u51b2\u3002sk_buff \u7ed3\u6784\u8de8\u5c42\u5904\u7406\u6570\u636e\u5305\uff0c\u5176 data \u6307\u9488\u6839\u636e\u534f\u8bae\u5c42\u52a8\u6001\u8c03\u6574\u3002device \u7ed3\u6784\u4e0e\u786c\u4ef6\u4ea4\u4e92\uff0c\u901a\u8fc7 sk_buff \u961f\u5217\u7ba1\u7406\u6570\u636e\u5305\u3002\u534f\u8bae\u5934\uff08tcphdr\u3001iphdr\u3001ethhdr\u3001arphdr\uff09\u5b9a\u4e49\u5404\u5c42\u6570\u636e\u5305\u683c\u5f0f\uff0c\u786e\u4fdd\u6570\u636e\u51c6\u786e\u5904\u7406\u548c\u4f20\u8f93\u3002<\/p>\n<h2 dir=\"auto\">\u5f00\u53d1\u8005\u5b9e\u7528\u5efa\u8bae<\/h2>\n<ul dir=\"auto\">\n<li><strong>\u6027\u80fd\u4f18\u5316<\/strong>\uff1a\u5408\u7406\u7ba1\u7406 sk_buff \u7f13\u51b2\u533a\uff0c\u51cf\u5c11\u5185\u5b58\u5f00\u9500\uff0c\u63d0\u5347\u541e\u5410\u91cf\u3002<\/li>\n<li><strong>\u53ef\u6269\u5c55\u6027<\/strong>\uff1a\u8c03\u6574 sock \u7ed3\u6784\u7684\u7f13\u51b2\u533a\u5927\u5c0f\uff08rcvbuf\u3001sndbuf\uff09\uff0c\u4ee5\u9002\u5e94\u9ad8\u6d41\u91cf\u573a\u666f\u3002<\/li>\n<li><strong>\u8c03\u8bd5<\/strong>\uff1a\u5229\u7528 sk_buff \u7684\u65f6\u95f4\u6233\u548c device \u7684\u72b6\u6001\u6807\u5fd7\u8bca\u65ad\u7f51\u7edc\u95ee\u9898\u3002<\/li>\n<li><strong>\u534f\u8bae\u652f\u6301<\/strong>\uff1a\u786e\u4fdd sock \u548c tcphdr \u4e2d TCP \u7279\u5b9a\u5b57\u6bb5\u7684\u517c\u5bb9\u6027\uff0c\u4ee5\u652f\u6301\u53ef\u9760\u5e94\u7528\u3002<\/li>\n<\/ul>\n<h2 dir=\"auto\">\u7ed3\u8bba<\/h2>\n<p dir=\"auto\">\u6df1\u5165\u7406\u89e3 Linux \u5185\u6838\u7f51\u7edc\u6808\u7684\u6838\u5fc3\u7ed3\u6784\u2014\u2014socket\u3001sock\u3001sk_buff\u3001device \u4ee5\u53ca\u534f\u8bae\u5934\u2014\u2014\u5bf9\u4e8e\u5f00\u53d1\u9ad8\u6027\u80fd\u7f51\u7edc\u5e94\u7528\u81f3\u5173\u91cd\u8981\u3002\u901a\u8fc7\u6709\u6548\u5229\u7528\u8fd9\u4e9b\u7ed3\u6784\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u4f18\u5316\u7f51\u7edc\u6027\u80fd\u3001\u786e\u4fdd\u6570\u636e\u4f20\u8f93\u53ef\u9760\u6027\u5e76\u9ad8\u6548\u6392\u67e5\u95ee\u9898\u3002\u672c\u6587\u4e3a\u6280\u672f\u4e13\u4e1a\u4eba\u58eb\u63d0\u4f9b\u4e86\u6df1\u5165\u7684\u89c1\u89e3\u548c\u5b9e\u7528\u6307\u5bfc\uff0c\u662f\u63a2\u7d22 Linux \u5185\u6838\u7f51\u7edc\u529f\u80fd\u7684\u575a\u5b9e\u57fa\u7840\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Linux \u5185\u6838\u7f51\u7edc\u6808\u662f\u5904\u7406\u7f51\u7edc&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4924],"tags":[],"class_list":["post-208399","post","type-post","status-publish","format-standard","hentry","category-setup-tutorials"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/208399","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=208399"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/208399\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=208399"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=208399"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=208399"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}