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* 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);
static inline u32 udp_hashfn(const struct net *net, u32 num, u32 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[0]
#define udp_portaddr_hash[1]
#define udp_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? */
* Following member retains the information to create a UDP header
* when the socket is uncorked.
__u16 len; /* total length of pending frames */
__u16 gso_size;
* 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);
/* GRO functions for UDP socket */
struct sk_buff * (*gro_receive)(struct sock *sk,
struct list_head *head,
struct sk_buff *skb);
int (*gro_complete)(struct sock *sk,
struct sk_buff *skb,
int nhoff);
/* udp_recvmsg try to use this before splicing sk_receive_queue */
struct sk_buff_head reader_queue ____cacheline_aligned_in_smp;
/* This field is dirtied by udp_recvmsg() */
int forward_deficit;
#define UDP_MAX_SEGMENTS (1 << 6UL)
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;
#define udp_portaddr_for_each_entry(__sk, list) \
hlist_for_each_entry(__sk, list, __sk_common.skc_portaddr_node)
#define udp_portaddr_for_each_entry_rcu(__sk, list) \
hlist_for_each_entry_rcu(__sk, list, __sk_common.skc_portaddr_node)
#define IS_UDPLITE(__sk) (__sk->sk_protocol == IPPROTO_UDPLITE)
#endif /* _LINUX_UDP_H */