runsc: support RDMA network devices#13124
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… flag to enable moving RDMA netdevs into sandbox netns with snapshotting of interface information.
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Moves RDMA-capable network interfaces from the host netns into the sandbox container's netns before the sandbox process is forked. This eliminates the need for CAP_SYS_ADMIN in the sentry during ibv_modify_qp on RDMA over Converged Ethernet (RoCE) machines and sandboxed network (i.e.
--network=sandbox) configurations. The netdevs that own the RoCE GIDs lives directly in the sandbox netns, so kernel-side GID-to-netdev resolution succeeds without needing the host namespace. Depends on--rdmaproxy-move-netdevsflag being passed into container runtime.Also adds ARPHRD_INFINIBAND constant and ARPHardwareInfiniBand type for InfiniBand device type support in the network stack.
Stacks on #13125.