深入理解rtnetlink及rtnl_link_ops结构功能

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资源摘要信息:"本资源主要涉及Linux内核中的网络接口(Network Interface)操作,特别是rtnetlink(route netlink)子系统中与网络接口相关的操作。通过分析标题中的"rtnetlink.rar_measure864_rtnl_link_ops"和描述中的"rtnetlink link operations",我们可以了解到这与Linux内核网络接口操作的详细实现相关。我们将详细探讨rtnetlink机制、struct rtnl_link_ops结构体的作用以及如何在Linux内核层面对网络接口进行操作。 首先,rtnetlink是Linux内核中用于管理网络接口的一种机制,它是一个netlink套接字,属于一种进程间通信(IPC)机制,允许用户空间程序与内核进行通信。通过rtnetlink,用户空间程序可以查询和修改内核的网络配置,例如添加、删除或更改网络接口的属性。它是netlink协议的一个特殊用途,专门用于网络相关的操作。 在rtnetlink中,struct rtnl_link_ops是一个关键的结构体,定义了一组函数指针,这些函数指针为不同类型的网络接口提供操作实现。这种设计使得rtnetlink能够支持多种不同类型的网络接口,如以太网、无线、PPP等,每种类型的网络接口都可以注册一组特定的操作,从而实现对该类型接口的特定处理。 struct rtnl_link_ops结构体通常包含以下字段: 1. kind:该字段描述了网络接口的类型。 2. setup:这是一个函数指针,用于初始化新的网络接口。 3. newlink:该函数用于创建新接口。 4. delink:该函数用于删除一个已存在的网络接口。 5. changelink:该函数用于修改网络接口的配置。 6. setlink:该函数用于设置网络接口的属性。 描述中提到的"measure864"可能是一个特定版本或项目代号,这表明该资源是针对特定版本的Linux内核中rtnetlink机制的一个测量或者性能分析结果。 文件列表中的"rtnetlink.c"是实现rtnetlink操作的关键源代码文件。在这个文件中,开发者可以找到rtnetlink机制的底层实现细节,包括struct rtnl_link_ops结构体的定义、注册和相关操作函数的实现。 了解和掌握这些知识点对于开发需要与Linux内核网络接口进行交互的应用程序非常重要,比如网络管理工具、自定义网络驱动程序以及各种网络监控和配置工具。 最后,对于希望深入研究Linux内核网络子系统的开发者来说,掌握rtnetlink的原理和应用是一个宝贵的财富,因为它是内核网络栈对外开放的重要接口之一。通过阅读相关代码和文档,开发者可以更加有效地进行网络接口的编程和问题调试。"

#!/bin/sh # Set the name of the primary network interface primary_interface="eth0" # Set the name of the secondary network interface secondary_interface="wlan0" # Set the IP address range of the local network local_network="192.168.1.0/24" primary_interface_table="eth0_table" # Keep running the script indefinitely while true; do # Check if the primary interface is up and connected to the local network if ip addr show $primary_interface up | grep -q $local_network; then # Add a new routing table for the primary interface echo "200 $primary_interface_table" >> /etc/iproute2/rt_tables # Add default route for primary interface to the new routing table primary_gateway=$(ip route show | grep "default" | grep "$primary_interface" | awk '{print $3}') ip route add default via $primary_gateway dev $primary_interface table $primary_interface_table # Add a rule to route all traffic from primary interface through the new routing table primary_ip=$(ip addr show $primary_interface | grep "inet\b" | awk '{print $2}' | cut -d/ -f1) ip rule add from $primary_ip table $primary_interface_table # Remove any existing default route for the secondary interface ip route del default dev $secondary_interface else # Remove any existing routing table for the primary interface existing_table=$(grep -n " $primary_interface_table" /etc/iproute2/rt_tables | cut -f1 -d:) if [ ! -z "$existing_table" ]; then sed -i "${existing_table}d" /etc/iproute2/rt_tables ip route flush table $primary_interface_table ip rule del table $primary_interface_table fi # Add default route for the secondary interface secondary_gateway=$(ip route show | grep "default" | grep "$secondary_interface" | awk '{print $3}') ip route add default via $secondary_gateway dev $secondary_interface fi # Wait for 1 second before checking the network interfaces again sleep 1 done 运行上述脚本,提示ip: RTNETLINK answers: File exists

2023-05-31 上传

#!/bin/sh # Set the name of the primary network interface primary_interface="eth0" # Set the name of the secondary network interface secondary_interface="wlan0" # Set the IP address range of the local network local_network="192.168.1.0/24" primary_interface_table="eth0_table" # Keep running the script indefinitely while true; do # Check if the primary interface is up and connected to the local network if ip addr show $primary_interface up | grep -q $local_network; then # Add a new routing table for the primary interface echo "200 $primary_interface_table" >> /etc/iproute2/rt_tables # Add default route for primary interface to the new routing table primary_gateway=$(ip route show | grep "default" | grep "$primary_interface" | awk '{print $3}') ip route add default via $primary_gateway dev $primary_interface table $primary_interface_table # Add a rule to route all traffic from primary interface through the new routing table primary_ip=$(ip addr show $primary_interface | grep "inet\b" | awk '{print $2}' | cut -d/ -f1) ip rule add from $primary_ip table $primary_interface_table # Remove any existing default route for the secondary interface ip route del default dev $secondary_interface else # Remove any existing routing table for the primary interface existing_table=$(grep -n " $primary_interface_table" /etc/iproute2/rt_tables | cut -f1 -d:) if [ ! -z "$existing_table" ]; then sed -i "${existing_table}d" /etc/iproute2/rt_tables ip route flush table $primary_interface_table ip rule del table $primary_interface_table fi # Add default route for the secondary interface secondary_gateway=$(ip route show | grep "default" | grep "$secondary_interface" | awk '{print $3}') ip route add default via $secondary_gateway dev $secondary_interface fi # Wait for 1 second before checking the network interfaces again sleep 1 done 运行上述脚本,提示ip: RTNETLINK answers: File exists, 请问如何修正

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