Lennart Poettering
5d594d012d
socket_bind_to_ifindex() uses the the SO_BINDTOIFINDEX sockopt of kernel 5.0, with a fallback to SO_BINDTODEVICE on older kernels. socket_bind_to_ifname() is a trivial wrapper around SO_BINDTODEVICE, the only benefit of using it instead of SO_BINDTODEVICE directly is that it determines the size of the interface name properly so that it also works for unbinding. Moreover, it's an attempt to unify our invocations of the sockopt with a size of strlen(ifname) rather than strlen(ifname)+1...
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