This is xnu-11215.1.10. See this file in: 
module Darwin.POSIX.net [system] {
  module dl {
    header "net/if_dl.h"
    export *
  }

  module if {
    header "net/if.h"
    export *
  }

  module types {
    header "net/if_types.h"
    export *
  }
}

module Darwin.net [system] {
  #ifdef XNU_KERNEL_PRIVATE
  // The XNU_PLATFORM_MacOSX headers are in the public SDK for macOS,
  // but mastered out of the public SDK for the other OSes.
  #endif
  #ifdef XNU_PLATFORM_MacOSX
  module bpf {
    header "net/bpf.h"
    export *
  }

  module dlil {
    header "net/dlil.h"
    export *
  }

  #endif
  module ethernet {
    header "net/ethernet.h"
    export *
  }

  #ifdef XNU_PLATFORM_MacOSX
  module if_arp {
    header "net/if_arp.h"
    export *
  }

  module if_llc {
    header "net/if_llc.h"
    export *
  }

  module if_media {
    header "net/if_media.h"
    export *
  }

  module if_mib {
    header "net/if_mib.h"
    export *
  }

  module if_utun {
    header "net/if_utun.h"
    export *
  }

  #endif
  module if_var {
    header "net/if_var.h"
    export *
  }

  explicit module if_var_status {
    header "net/if_var_status.h"
    export *
  }

  #ifdef XNU_PLATFORM_MacOSX
  module kext_net {
    header "net/kext_net.h"
    export *
  }

  module ndrv {
    header "net/ndrv.h"
    export *
  }

  #endif
  module net_kev {
    header "net/net_kev.h"
    export *
  }

  module pfkeyv2 {
    header "net/pfkeyv2.h"
    export *
  }
  #ifdef XNU_PLATFORM_MacOSX

  module route {
    header "net/route.h"
    export *
  }
  #endif
}