LXR linux/include/linux/udp.h

   1/*
   2 * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3 *              operating system.  INET is implemented using the  BSD Socket
   4 *              interface as the means of communication with the user level.
   5 *
   6 *              Definitions for the UDP protocol.
   7 *
   8 * Version:     @(#)udp.h       1.0.2   04/28/93
   9 *
  10 * Author:      Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  11 *
  12 *              This program is free software; you can redistribute it and/or
  13 *              modify it under the terms of the GNU General Public License
  14 *              as published by the Free Software Foundation; either version
  15 *              2 of the License, or (at your option) any later version.
  16 */
  17#ifndef _LINUX_UDP_H
  18#define _LINUX_UDP_H
  19
  20#include <net/inet_sock.h>
  21#include <linux/skbuff.h>
  22#include <net/netns/hash.h>
  23#include <uapi/linux/udp.h>
  24
  25static inline struct udphdr *udp_hdr(const struct sk_buff *skb)
  26{
  27        return (struct udphdr *)skb_transport_header(skb);
  28}
  29
  30static inline struct udphdr *inner_udp_hdr(const struct sk_buff *skb)
  31{
  32        return (struct udphdr *)skb_inner_transport_header(skb);
  33}
  34
  35#define UDP_HTABLE_SIZE_MIN             (CONFIG_BASE_SMALL ? 128 : 256)
  36
  37static inline int udp_hashfn(struct net *net, unsigned num, unsigned mask)
  38{
  39        return (num + net_hash_mix(net)) & mask;
  40}
  41
  42struct udp_sock {
  43        /* inet_sock has to be the first member */
  44        struct inet_sock inet;
  45#define udp_port_hash           inet.sk.__sk_common.skc_u16hashes[0]
  46#define udp_portaddr_hash       inet.sk.__sk_common.skc_u16hashes[1]
  47#define udp_portaddr_node       inet.sk.__sk_common.skc_portaddr_node
  48        int              pending;       /* Any pending frames ? */
  49        unsigned int     corkflag;      /* Cork is required */
  50        __u8             encap_type;    /* Is this an Encapsulation socket? */
  51        unsigned char    no_check6_tx:1,/* Send zero UDP6 checksums on TX? */
  52                         no_check6_rx:1,/* Allow zero UDP6 checksums on RX? */
  53                         convert_csum:1;/* On receive, convert checksum
  54                                         * unnecessary to checksum complete
  55                                         * if possible.
  56                                         */
  57        /*
  58         * Following member retains the information to create a UDP header
  59         * when the socket is uncorked.
  60         */
  61        __u16            len;           /* total length of pending frames */
  62        /*
  63         * Fields specific to UDP-Lite.
  64         */
  65        __u16            pcslen;
  66        __u16            pcrlen;
  67/* indicator bits used by pcflag: */
  68#define UDPLITE_BIT      0x1            /* set by udplite proto init function */
  69#define UDPLITE_SEND_CC  0x2            /* set via udplite setsockopt         */
  70#define UDPLITE_RECV_CC  0x4            /* set via udplite setsocktopt        */
  71        __u8             pcflag;        /* marks socket as UDP-Lite if > 0    */
  72        __u8             unused[3];
  73        /*
  74         * For encapsulation sockets.
  75         */
  76        int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
  77        void (*encap_destroy)(struct sock *sk);
  78};
  79
  80static inline struct udp_sock *udp_sk(const struct sock *sk)
  81{
  82        return (struct udp_sock *)sk;
  83}
  84
  85static inline void udp_set_no_check6_tx(struct sock *sk, bool val)
  86{
  87        udp_sk(sk)->no_check6_tx = val;
  88}
  89
  90static inline void udp_set_no_check6_rx(struct sock *sk, bool val)
  91{
  92        udp_sk(sk)->no_check6_rx = val;
  93}
  94
  95static inline bool udp_get_no_check6_tx(struct sock *sk)
  96{
  97        return udp_sk(sk)->no_check6_tx;
  98}
  99
 100static inline bool udp_get_no_check6_rx(struct sock *sk)
 101{
 102        return udp_sk(sk)->no_check6_rx;
 103}
 104
 105static inline void udp_set_convert_csum(struct sock *sk, bool val)
 106{
 107        udp_sk(sk)->convert_csum = val;
 108}
 109
 110static inline bool udp_get_convert_csum(struct sock *sk)
 111{
 112        return udp_sk(sk)->convert_csum;
 113}
 114
 115#define udp_portaddr_for_each_entry(__sk, node, list) \
 116        hlist_nulls_for_each_entry(__sk, node, list, __sk_common.skc_portaddr_node)
 117
 118#define udp_portaddr_for_each_entry_rcu(__sk, node, list) \
 119        hlist_nulls_for_each_entry_rcu(__sk, node, list, __sk_common.skc_portaddr_node)
 120
 121#define IS_UDPLITE(__sk) (udp_sk(__sk)->pcflag)
 122
 123#endif  /* _LINUX_UDP_H */
 124