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, <[email protected]> 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 25 static inline struct udphdr *udp_hdr(const struct sk_buff *skb) 26 { 27 return (struct udphdr *)skb_transport_header(skb); 28 } 29 30 #define UDP_HTABLE_SIZE_MIN (CONFIG_BASE_SMALL ? 128 : 256) 31 32 static inline int udp_hashfn(struct net *net, unsigned num, unsigned mask) 33 { 34 return (num + net_hash_mix(net)) & mask; 35 } 36 37 struct udp_sock { 38 /* inet_sock has to be the first member */ 39 struct inet_sock inet; 40 #define udp_port_hash inet.sk.__sk_common.skc_u16hashes[0] 41 #define udp_portaddr_hash inet.sk.__sk_common.skc_u16hashes[1] 42 #define udp_portaddr_node inet.sk.__sk_common.skc_portaddr_node 43 int pending; /* Any pending frames ? */ 44 unsigned int corkflag; /* Cork is required */ 45 __u16 encap_type; /* Is this an Encapsulation socket? */ 46 /* 47 * Following member retains the information to create a UDP header 48 * when the socket is uncorked. 49 */ 50 __u16 len; /* total length of pending frames */ 51 /* 52 * Fields specific to UDP-Lite. 53 */ 54 __u16 pcslen; 55 __u16 pcrlen; 56 /* indicator bits used by pcflag: */ 57 #define UDPLITE_BIT 0x1 /* set by udplite proto init function */ 58 #define UDPLITE_SEND_CC 0x2 /* set via udplite setsockopt */ 59 #define UDPLITE_RECV_CC 0x4 /* set via udplite setsocktopt */ 60 __u8 pcflag; /* marks socket as UDP-Lite if > 0 */ 61 __u8 unused[3]; 62 /* 63 * For encapsulation sockets. 64 */ 65 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); 66 }; 67 68 static inline struct udp_sock *udp_sk(const struct sock *sk) 69 { 70 return (struct udp_sock *)sk; 71 } 72 73 #define udp_portaddr_for_each_entry(__sk, node, list) \ 74 hlist_nulls_for_each_entry(__sk, node, list, __sk_common.skc_portaddr_node) 75 76 #define udp_portaddr_for_each_entry_rcu(__sk, node, list) \ 77 hlist_nulls_for_each_entry_rcu(__sk, node, list, __sk_common.skc_portaddr_node) 78 79 #define IS_UDPLITE(__sk) (udp_sk(__sk)->pcflag) 80 81 #endif /* _LINUX_UDP_H */ 82