ping_prot

       {
.type =       SOCK_DGRAM,
.protocol =   IPPROTO_ICMP,
.prot =       &ping_prot,
.ops =        &inet_dgram_ops,
.flags =      INET_PROTOSW_REUSE,

       },

struct proto ping_prot = {
.name = "PING",
.owner = THIS_MODULE,
.init = ping_init_sock,
.close = ping_close,
.connect = ip4_datagram_connect,
.disconnect = udp_disconnect,
.setsockopt = ip_setsockopt,
.getsockopt = ip_getsockopt,
.sendmsg = ping_v4_sendmsg,
.recvmsg = ping_recvmsg,
.bind = ping_bind,
.backlog_rcv =ping_queue_rcv_skb,
.release_cb = ip4_datagram_release_cb,
.hash = ping_hash,
.unhash = ping_unhash,
.get_port = ping_get_port,
.obj_size = sizeof(struct inet_sock),
};

const struct proto_ops inet_dgram_ops = {
.family   = PF_INET,
.owner   = THIS_MODULE,
.release   = inet_release,
.bind   = inet_bind,
.connect   = inet_dgram_connect,
.socketpair   = sock_no_socketpair,
.accept   = sock_no_accept,
.getname   = inet_getname,
.poll   = udp_poll,
.ioctl   = inet_ioctl,
.listen   = sock_no_listen,
.shutdown   = inet_shutdown,
.setsockopt   = sock_common_setsockopt,
.getsockopt   = sock_common_getsockopt,
.sendmsg   = inet_sendmsg,
.recvmsg   = inet_recvmsg,
.mmap   = sock_no_mmap,
.sendpage   = inet_sendpage,
.set_peek_off   = sk_set_peek_off,
#ifdef CONFIG_COMPAT
.compat_setsockopt = compat_sock_common_setsockopt,
.compat_getsockopt = compat_sock_common_getsockopt,
.compat_ioctl   = inet_compat_ioctl,
#endif
};