linux-imx

/*

 * INET     An implementation of the TCP/IP protocol suite for the LINUX

 *      operating system.  INET is implemented using the  BSD Socket

 *      interface as the means of communication with the user level.

 *

 *      Definitions for the UDP module.

 *

 * Version: @(#)udp.h   1.0.2   05/07/93

 *

 * Authors: Ross Biro

 *      Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>

 *

 * Fixes:

 *      Alan Cox    : Turned on udp checksums. I don't want to

 *                chase 'memory corruption' bugs that aren't!

 *

 *      This program is free software; you can redistribute it and/or

 *      modify it under the terms of the GNU General Public License

 *      as published by the Free Software Foundation; either version

 *      2 of the License, or (at your option) any later version.

 */

#ifndef _UDP_H

#define _UDP_H

​

#include <linux/list.h>

#include <linux/bug.h>

#include <net/inet_sock.h>

#include <net/sock.h>

#include <net/snmp.h>

#include <net/ip.h>

#include <linux/ipv6.h>

#include <linux/seq_file.h>

#include <linux/poll.h>

​

/**

 *  struct udp_skb_cb  -  UDP(-Lite) private variables

 *

 *  @header:      private variables used by IPv4/IPv6

 *  @cscov:       checksum coverage length (UDP-Lite only)

 *  @partial_cov: if set indicates partial csum coverage

 */

struct udp_skb_cb {

    union {

        struct inet_skb_parm    h4;

#if IS_ENABLED(CONFIG_IPV6)

        struct inet6_skb_parm   h6;

#endif

    } header;

    __u16       cscov;

    __u8        partial_cov;

};

#define UDP_SKB_CB(__skb)   ((struct udp_skb_cb *)((__skb)->cb))

​

/**

 *  struct udp_hslot - UDP hash slot

 *

 *  @head:  head of list of sockets

 *  @count: number of sockets in 'head' list

 *  @lock:  spinlock protecting changes to head/count

 */

struct udp_hslot {

    struct hlist_head   head;

    int         count;