• Alexei Starovoitov's avatar
    net: sock: allow eBPF programs to be attached to sockets · 89aa0758
    Alexei Starovoitov authored
    introduce new setsockopt() command:
    
    setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd, sizeof(prog_fd))
    
    where prog_fd was received from syscall bpf(BPF_PROG_LOAD, attr, ...)
    and attr->prog_type == BPF_PROG_TYPE_SOCKET_FILTER
    
    setsockopt() calls bpf_prog_get() which increments refcnt of the program,
    so it doesn't get unloaded while socket is using the program.
    
    The same eBPF program can be attached to multiple sockets.
    
    User task exit automatically closes socket which calls sk_filter_uncharge()
    which decrements refcnt of eBPF program
    Signed-off-by: default avatarAlexei Starovoitov <ast@plumgrid.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    89aa0758
socket.h 1.82 KB