linux路由基础知识(一)
创始人
2024-12-29 11:34:25
0

内核路由表:fib_table

路由表项的增加和查询,fib_table_insert和fib_table_lookup。

跟踪fib_table_insert和fib_table_lookup两个接口。

#!/usr/bin/env bpftrace  #include  #include   kprobe:fib_table_insert {     printf("fib_table_insert\n");     @[kstack]=count(); }  kprobe:fib_table_lookup {     printf("fib_table_lookup\n");     @[kstack]=count(); }

在创建路由的时候,可以捕获到fib_table_insert接口的使用。

正常的接受报文会触发路由表的查询。

1)一个是接收报文路径,会有入向input路由表的查找;

2)一个是用户态发起connec/bind,或者内核tcp接受路径回复ack的时候,会有出向output路由表的创建和查找。

[root@localhost leiyanjie]# bpftrace route.bt Attaching 2 probes... fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup fib_table_lookup ^C  @[     fib_table_lookup+1     ip_route_output_key_hash_rcu+942     ip_route_output_key_hash+90     ip_route_output_flow+25     inet_csk_route_req+221     tcp_conn_request+898     tcp_rcv_state_process+382     tcp_v4_do_rcv+186     tcp_v4_rcv+3577     ip_protocol_deliver_rcu+48     ip_local_deliver_finish+68     ip_local_deliver+255     ip_rcv+216     __netif_receive_skb_one_core+137     process_backlog+158     net_rx_action+309     __do_softirq+188     asm_call_sysvec_on_stack+15     do_softirq_own_stack+55     do_softirq.part.18+47     __local_bh_enable_ip+79     ip_finish_output2+384     ip_output+109     __ip_queue_xmit+359     __tcp_transmit_skb+2638     tcp_connect+2856     tcp_v4_connect+1237     __inet_stream_connect+210     inet_stream_connect+54     __sys_connect+154     __x64_sys_connect+22     do_syscall_64+48     entry_SYSCALL_64_after_hwframe+98 ]: 1 @[     fib_table_lookup+1     __inet_dev_addr_type.isra.28+167     __inet6_bind+675     __sys_bind+211     __x64_sys_bind+22     do_syscall_64+48     entry_SYSCALL_64_after_hwframe+98 ]: 1 @[     fib_table_lookup+1     ip_route_output_key_hash_rcu+942     ip_route_output_key_hash+90     ip_route_output_flow+25     inet_csk_route_child_sock+286     tcp_v4_syn_recv_sock+912     tcp_v6_syn_recv_sock+1568     tcp_check_req+306     tcp_v4_rcv+2456     ip_protocol_deliver_rcu+48     ip_local_deliver_finish+68     ip_local_deliver+255     ip_rcv+216     __netif_receive_skb_one_core+137     process_backlog+158     net_rx_action+309     __do_softirq+188     asm_call_sysvec_on_stack+15     do_softirq_own_stack+55     do_softirq.part.18+47     __local_bh_enable_ip+79     ip_finish_output2+384     ip_output+109     __ip_queue_xmit+359     __tcp_transmit_skb+2638     tcp_rcv_synsent_state_process+1803     tcp_rcv_state_process+235     tcp_v4_do_rcv+186     __release_sock+121     release_sock+43     inet_stream_connect+65     __sys_connect+154     __x64_sys_connect+22     do_syscall_64+48     entry_SYSCALL_64_after_hwframe+98 ]: 1 @[     fib_table_lookup+1     ip_route_output_key_hash_rcu+942     ip_route_output_key_hash+90     ip_route_output_flow+25     ip_send_unicast_reply+480     tcp_v4_send_ack+648     tcp_v4_rcv+1259     ip_protocol_deliver_rcu+48     ip_local_deliver_finish+68     ip_local_deliver+255     ip_rcv+216     __netif_receive_skb_one_core+137     process_backlog+158     net_rx_action+309     __do_softirq+188     asm_call_sysvec_on_stack+15     do_softirq_own_stack+55     do_softirq.part.18+47     flush_smp_call_function_from_idle+68     do_idle+328     cpu_startup_entry+25     start_secondary+276     secondary_startup_64_no_verify+176 ]: 3 @[     fib_table_lookup+1     ip_route_output_key_hash_rcu+942     ip_route_output_key_hash+90     ip_route_output_flow+25     tcp_v4_connect+1209     __inet_stream_connect+210     inet_stream_connect+54     __sys_connect+154     __x64_sys_connect+22     do_syscall_64+48     entry_SYSCALL_64_after_hwframe+98 ]: 4 @[     fib_table_lookup+1     ip_route_output_key_hash_rcu+942     ip_route_output_key_hash+90     ip_route_output_flow+25     tcp_v4_connect+357     __inet_stream_connect+210     inet_stream_connect+54     __sys_connect+154     __x64_sys_connect+22     do_syscall_64+48     entry_SYSCALL_64_after_hwframe+98 ]: 4 @[     fib_table_lookup+1     ip_route_output_key_hash_rcu+942     ip_route_output_key_hash+90     tcp_v4_connect+943     __inet_stream_connect+210     inet_stream_connect+54     __sys_connect+154     __x64_sys_connect+22     do_syscall_64+48     entry_SYSCALL_64_after_hwframe+98 ]: 4 @[     fib_table_lookup+1     ip_route_input_slow+492     ip_route_input_rcu+609     ip_route_input_noref+37     ip_rcv_finish_core.isra.22+101     ip_rcv_finish+100     ip_rcv+216     __netif_receive_skb_one_core+137     process_backlog+158     net_rx_action+309     __do_softirq+188     asm_call_sysvec_on_stack+15     do_softirq_own_stack+55     do_softirq.part.18+47     flush_smp_call_function_from_idle+68     do_idle+328     cpu_startup_entry+25     start_secondary+276     secondary_startup_64_no_verify+176 ]: 11 @[     fib_table_lookup+1     __fib_validate_source+326     fib_validate_source+70     ip_route_input_slow+2498     ip_route_input_rcu+609     ip_route_input_noref+37     ip_rcv_finish_core.isra.22+101     ip_rcv_finish+100     ip_rcv+216     __netif_receive_skb_one_core+137     process_backlog+158     net_rx_action+309     __do_softirq+188     asm_call_sysvec_on_stack+15     do_softirq_own_stack+55     do_softirq.part.18+47     flush_smp_call_function_from_idle+68     do_idle+328     cpu_startup_entry+25     start_secondary+276     secondary_startup_64_no_verify+176 ]: 11

相关内容

热门资讯

一分钟内幕!科乐吉林麻将系统发... 一分钟内幕!科乐吉林麻将系统发牌规律,福建大玩家确实真的是有挂,技巧教程(有挂ai代打);所有人都在...
一分钟揭秘!微扑克辅助软件(透... 一分钟揭秘!微扑克辅助软件(透视辅助)确实是有挂(2024已更新)(哔哩哔哩);1、用户打开应用后不...
五分钟发现!广东雀神麻雀怎么赢... 五分钟发现!广东雀神麻雀怎么赢,朋朋棋牌都是是真的有挂,高科技教程(有挂方法)1、广东雀神麻雀怎么赢...
每日必看!人皇大厅吗(透明挂)... 每日必看!人皇大厅吗(透明挂)好像存在有挂(2026已更新)(哔哩哔哩);人皇大厅吗辅助器中分为三种...
重大科普!新华棋牌有挂吗(透视... 重大科普!新华棋牌有挂吗(透视)一直是有挂(2021已更新)(哔哩哔哩)1、完成新华棋牌有挂吗的残局...
二分钟内幕!微信小程序途游辅助... 二分钟内幕!微信小程序途游辅助器,掌中乐游戏中心其实存在有挂,微扑克教程(有挂规律)二分钟内幕!微信...
科技揭秘!jj斗地主系统控牌吗... 科技揭秘!jj斗地主系统控牌吗(透视)本来真的是有挂(2025已更新)(哔哩哔哩)1、科技揭秘!jj...
1分钟普及!哈灵麻将攻略小,微... 1分钟普及!哈灵麻将攻略小,微信小程序十三张好像存在有挂,规律教程(有挂技巧)哈灵麻将攻略小是一种具...
9分钟教程!科乐麻将有挂吗,传... 9分钟教程!科乐麻将有挂吗,传送屋高防版辅助(总是存在有挂)1、完成传送屋高防版辅助透视辅助安装,帮...
每日必看教程!兴动游戏辅助器下... 每日必看教程!兴动游戏辅助器下载(辅助)真是真的有挂(2025已更新)(哔哩哔哩)1、打开软件启动之...