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 IP module.

 *

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

 *

 * Authors: Ross Biro

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

 *      Alan Cox, <gw4pts@gw4pts.ampr.org>

 *

 * Changes:

 *      Mike McLagan    :       Routing by source

 *

 *      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 _IP_H

#define _IP_H

​

#include <linux/types.h>

#include <linux/ip.h>

#include <linux/in.h>

#include <linux/skbuff.h>

#include <linux/jhash.h>

​

#include <net/inet_sock.h>

#include <net/route.h>

#include <net/snmp.h>

#include <net/flow.h>

#include <net/flow_dissector.h>

#include <net/netns/hash.h>

​

#define IPV4_MAX_PMTU       65535U      /* RFC 2675, Section 5.1 */

#define IPV4_MIN_MTU        68          /* RFC 791 */

​

struct sock;

​

struct inet_skb_parm {

    int         iif;

    struct ip_options   opt;        /* Compiled IP options      */

    u16         flags;

​

#define IPSKB_FORWARDED     BIT(0)

#define IPSKB_XFRM_TUNNEL_SIZE  BIT(1)

#define IPSKB_XFRM_TRANSFORMED  BIT(2)

#define IPSKB_FRAG_COMPLETE BIT(3)

#define IPSKB_REROUTED      BIT(4)

#define IPSKB_DOREDIRECT    BIT(5)

#define IPSKB_FRAG_PMTU     BIT(6)

#define IPSKB_L3SLAVE       BIT(7)

​

    u16         frag_max_size;

};

​

static inline bool ipv4_l3mdev_skb(u16 flags)

{

    return !!(flags & IPSKB_L3SLAVE);

}

​

static inline unsigned int ip_hdrlen(const struct sk_buff *skb)

{

    return ip_hdr(skb)->ihl * 4;

}

​

struct ipcm_cookie {

    struct sockcm_cookie    sockc;

    __be32          addr;

    int         oif;

    struct ip_options_rcu   *opt;

    __u8            ttl;

    __s16           tos;

    char            priority;

    __u16           gso_size;

};

​

static inline void ipcm_init(struct ipcm_cookie *ipcm)

{

    *ipcm = (struct ipcm_cookie) { .tos = -1 };

}

​

static inline void ipcm_init_sk(struct ipcm_cookie *ipcm,

                const struct inet_sock *inet)

{

    ipcm_init(ipcm);

​

    ipcm->sockc.tsflags = inet->sk.sk_tsflags;

    ipcm->oif = inet->sk.sk_bound_dev_if;