How to increase net.core.rmem_max value from c code

Question

I tried to increase the value SO_RCVBUF by getsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &rcvBufferSize, &sockOptSize) but I am not able to increase it more than rmem_

Answer 1

In Linux kernels 2.6.14 and above we have SO_RCVBUFFORCE which can be used to override the rmem_max limit. However this needs CAP_NET_ADMIN to be set.

Check https://linux.die.net/man/7/socket.