PF_ISDN
.family = PF_ISDN,
sk = sk_alloc(net, PF_ISDN, GFP_KERNEL, &mISDN_proto, kern);
.family = PF_ISDN,
sk = sk_alloc(net, PF_ISDN, GFP_KERNEL, &mISDN_proto, kern);
.family = PF_ISDN,
sock_unregister(PF_ISDN);
[PF_ISDN] = "PF_ISDN",
case PF_ISDN: