root/include/linux/udp.h

INCLUDED FROM

DEFINITIONS

1. udp_hdr
2. inner_udp_hdr
3. udp_hashfn
4. udp_sk
5. udp_set_no_check6_tx
6. udp_set_no_check6_rx
7. udp_get_no_check6_tx
8. udp_get_no_check6_rx
9. udp_set_convert_csum
10. udp_get_convert_csum

/*
 * 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 protocol.
 *
 * Version:     @(#)udp.h       1.0.2   04/28/93
 *
 * Author:      Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *
 *              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 _LINUX_UDP_H
#define _LINUX_UDP_H

#include <net/inet_sock.h>
#include <linux/skbuff.h>
#include <net/netns/hash.h>
#include <uapi/linux/udp.h>

static inline struct udphdr *udp_hdr(const struct sk_buff *skb)
{
        return (struct udphdr *)skb_transport_header(skb);
}

static inline struct udphdr *inner_udp_hdr(const struct sk_buff *skb)
{
        return (struct udphdr *)skb_inner_transport_header(skb);
}

#define UDP_HTABLE_SIZE_MIN             (CONFIG_BASE_SMALL ? 128 : 256)

static inline int udp_hashfn(struct net *net, unsigned num, unsigned mask)
{
        return (num + net_hash_mix(net)) & mask;
}

struct udp_sock {
        /* inet_sock has to be the first member */
        struct inet_sock inet;
#define udp_port_hash           inet.sk.__sk_common.skc_u16hashes[0]
#define udp_portaddr_hash       inet.sk.__sk_common.skc_u16hashes[1]
#define udp_portaddr_node       inet.sk.__sk_common.skc_portaddr_node
        int              pending;       /* Any pending frames ? */
        unsigned int     corkflag;      /* Cork is required */
        __u8             encap_type;    /* Is this an Encapsulation socket? */
        unsigned char    no_check6_tx:1,/* Send zero UDP6 checksums on TX? */
                         no_check6_rx:1,/* Allow zero UDP6 checksums on RX? */
                         convert_csum:1;/* On receive, convert checksum
                                         * unnecessary to checksum complete
                                         * if possible.
                                         */
        /*
         * Following member retains the information to create a UDP header
         * when the socket is uncorked.
         */
        __u16            len;           /* total length of pending frames */
        /*
         * Fields specific to UDP-Lite.
         */
        __u16            pcslen;
        __u16            pcrlen;
/* indicator bits used by pcflag: */
#define UDPLITE_BIT      0x1            /* set by udplite proto init function */
#define UDPLITE_SEND_CC  0x2            /* set via udplite setsockopt         */
#define UDPLITE_RECV_CC  0x4            /* set via udplite setsocktopt        */
        __u8             pcflag;        /* marks socket as UDP-Lite if > 0    */
        __u8             unused[3];
        /*
         * For encapsulation sockets.
         */
        int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
        void (*encap_destroy)(struct sock *sk);
};

static inline struct udp_sock *udp_sk(const struct sock *sk)
{
        return (struct udp_sock *)sk;
}

static inline void udp_set_no_check6_tx(struct sock *sk, bool val)
{
        udp_sk(sk)->no_check6_tx = val;
}

static inline void udp_set_no_check6_rx(struct sock *sk, bool val)
{
        udp_sk(sk)->no_check6_rx = val;
}

static inline bool udp_get_no_check6_tx(struct sock *sk)
{
        return udp_sk(sk)->no_check6_tx;
}

static inline bool udp_get_no_check6_rx(struct sock *sk)
{
        return udp_sk(sk)->no_check6_rx;
}

static inline void udp_set_convert_csum(struct sock *sk, bool val)
{
        udp_sk(sk)->convert_csum = val;
}

static inline bool udp_get_convert_csum(struct sock *sk)
{
        return udp_sk(sk)->convert_csum;
}

#define udp_portaddr_for_each_entry(__sk, node, list) \
        hlist_nulls_for_each_entry(__sk, node, list, __sk_common.skc_portaddr_node)

#define udp_portaddr_for_each_entry_rcu(__sk, node, list) \
        hlist_nulls_for_each_entry_rcu(__sk, node, list, __sk_common.skc_portaddr_node)

#define IS_UDPLITE(__sk) (udp_sk(__sk)->pcflag)

#endif  /* _LINUX_UDP_H */