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