This patchset reworks rtnetlink notifications. Notification logic is fixed and gets hidden behind nlmsg_notify() and the rtnl socket is no longer directly accessed. All notification paths get appropriate error handling. NLM_F_ECHO support is added where it makes sense and no major surgery is required. Abuses of current->pid for netlink pids are fixed. An exception is made for users of rtnetlink_send() which will get converted in a second step as some bigger code change are required.
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