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.
6 * Definitions for the UDP protocol.
8 * Version: @(#)udp.h 1.0.2 04/28/93
10 * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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.
20 #include <net/inet_sock.h>
21 #include <linux/skbuff.h>
22 #include <net/netns/hash.h>
23 #include <uapi/linux/udp.h>
25 static inline struct udphdr
*udp_hdr(const struct sk_buff
*skb
)
27 return (struct udphdr
*)skb_transport_header(skb
);
30 static inline struct udphdr
*inner_udp_hdr(const struct sk_buff
*skb
)
32 return (struct udphdr
*)skb_inner_transport_header(skb
);
35 #define UDP_HTABLE_SIZE_MIN (CONFIG_BASE_SMALL ? 128 : 256)
37 static inline u32
udp_hashfn(const struct net
*net
, u32 num
, u32 mask
)
39 return (num
+ net_hash_mix(net
)) & mask
;
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? */
54 * Following member retains the information to create a UDP header
55 * when the socket is uncorked.
57 __u16 len
; /* total length of pending frames */
60 * Fields specific to UDP-Lite.
64 /* indicator bits used by pcflag: */
65 #define UDPLITE_BIT 0x1 /* set by udplite proto init function */
66 #define UDPLITE_SEND_CC 0x2 /* set via udplite setsockopt */
67 #define UDPLITE_RECV_CC 0x4 /* set via udplite setsocktopt */
68 __u8 pcflag
; /* marks socket as UDP-Lite if > 0 */
71 * For encapsulation sockets.
73 int (*encap_rcv
)(struct sock
*sk
, struct sk_buff
*skb
);
74 void (*encap_destroy
)(struct sock
*sk
);
76 /* GRO functions for UDP socket */
77 struct sk_buff
* (*gro_receive
)(struct sock
*sk
,
78 struct list_head
*head
,
80 int (*gro_complete
)(struct sock
*sk
,
84 /* udp_recvmsg try to use this before splicing sk_receive_queue */
85 struct sk_buff_head reader_queue ____cacheline_aligned_in_smp
;
87 /* This field is dirtied by udp_recvmsg() */
91 #define UDP_MAX_SEGMENTS (1 << 6UL)
93 static inline struct udp_sock
*udp_sk(const struct sock
*sk
)
95 return (struct udp_sock
*)sk
;
98 static inline void udp_set_no_check6_tx(struct sock
*sk
, bool val
)
100 udp_sk(sk
)->no_check6_tx
= val
;
103 static inline void udp_set_no_check6_rx(struct sock
*sk
, bool val
)
105 udp_sk(sk
)->no_check6_rx
= val
;
108 static inline bool udp_get_no_check6_tx(struct sock
*sk
)
110 return udp_sk(sk
)->no_check6_tx
;
113 static inline bool udp_get_no_check6_rx(struct sock
*sk
)
115 return udp_sk(sk
)->no_check6_rx
;
118 #define udp_portaddr_for_each_entry(__sk, list) \
119 hlist_for_each_entry(__sk, list, __sk_common.skc_portaddr_node)
121 #define udp_portaddr_for_each_entry_rcu(__sk, list) \
122 hlist_for_each_entry_rcu(__sk, list, __sk_common.skc_portaddr_node)
124 #define IS_UDPLITE(__sk) (__sk->sk_protocol == IPPROTO_UDPLITE)
126 #endif /* _LINUX_UDP_H */