Using bind() - Githubissues

Notes related to bind research: nl_pid: The unicast address of a netlink socket. For kernel netlink sockets, it should be 0. Userspace applications sometimes set the nl_pid to be their process id (pid). In a userspace application, when you set nl_pid explicitly to 0, or don’t set it at all, and afterwards call bind(), the kernel method netlink_autobind() assigns a value to nl_pid. It tries to assign the process id of the current thread. If you’re creating two sockets in userspace, then you are responsible that their nl_pids are unique in case you don't call bind. Netlink sockets are not used only for networking; other subsystems, such as SELinux, audit, uevent, and others, use netlink sockets. The rtnelink sockets are netlink sockets specifically used for networking; they are used for routing messages, neighbouring messages, link messages, and more networking subsystem messages

kckeiks / netlink

Using bind() #12