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1da177e4 LT |
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 | ||
14c85021 | 20 | #include <net/inet_sock.h> |
310afe86 | 21 | #include <linux/skbuff.h> |
0b441916 | 22 | #include <net/netns/hash.h> |
607ca46e | 23 | #include <uapi/linux/udp.h> |
310afe86 JP |
24 | |
25 | static inline struct udphdr *udp_hdr(const struct sk_buff *skb) | |
26 | { | |
27 | return (struct udphdr *)skb_transport_header(skb); | |
28 | } | |
29 | ||
6a674e9c JG |
30 | static inline struct udphdr *inner_udp_hdr(const struct sk_buff *skb) |
31 | { | |
32 | return (struct udphdr *)skb_inner_transport_header(skb); | |
33 | } | |
34 | ||
f86dcc5a | 35 | #define UDP_HTABLE_SIZE_MIN (CONFIG_BASE_SMALL ? 128 : 256) |
1da177e4 | 36 | |
f86dcc5a | 37 | static inline int udp_hashfn(struct net *net, unsigned num, unsigned mask) |
d6266281 | 38 | { |
f86dcc5a | 39 | return (num + net_hash_mix(net)) & mask; |
d6266281 PE |
40 | } |
41 | ||
1da177e4 LT |
42 | struct udp_sock { |
43 | /* inet_sock has to be the first member */ | |
44 | struct inet_sock inet; | |
d4cada4a ED |
45 | #define udp_port_hash inet.sk.__sk_common.skc_u16hashes[0] |
46 | #define udp_portaddr_hash inet.sk.__sk_common.skc_u16hashes[1] | |
512615b6 | 47 | #define udp_portaddr_node inet.sk.__sk_common.skc_portaddr_node |
1da177e4 LT |
48 | int pending; /* Any pending frames ? */ |
49 | unsigned int corkflag; /* Cork is required */ | |
1c19448c TH |
50 | __u8 encap_type; /* Is this an Encapsulation socket? */ |
51 | unsigned char no_check6_tx:1,/* Send zero UDP6 checksums on TX? */ | |
2abb7cdc TH |
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 | */ | |
1da177e4 | 57 | /* |
47bdd718 | 58 | * Following member retains the information to create a UDP header |
1da177e4 LT |
59 | * when the socket is uncorked. |
60 | */ | |
61 | __u16 len; /* total length of pending frames */ | |
ba4e58ec GR |
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 */ | |
342f0234 JC |
72 | __u8 unused[3]; |
73 | /* | |
74 | * For encapsulation sockets. | |
75 | */ | |
76 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); | |
44046a59 | 77 | void (*encap_destroy)(struct sock *sk); |
1da177e4 LT |
78 | }; |
79 | ||
80 | static inline struct udp_sock *udp_sk(const struct sock *sk) | |
81 | { | |
82 | return (struct udp_sock *)sk; | |
83 | } | |
e898d4db | 84 | |
1c19448c TH |
85 | static inline void udp_set_no_check6_tx(struct sock *sk, bool val) |
86 | { | |
87 | udp_sk(sk)->no_check6_tx = val; | |
88 | } | |
89 | ||
90 | static inline void udp_set_no_check6_rx(struct sock *sk, bool val) | |
91 | { | |
92 | udp_sk(sk)->no_check6_rx = val; | |
93 | } | |
94 | ||
95 | static inline bool udp_get_no_check6_tx(struct sock *sk) | |
96 | { | |
97 | return udp_sk(sk)->no_check6_tx; | |
98 | } | |
99 | ||
100 | static inline bool udp_get_no_check6_rx(struct sock *sk) | |
101 | { | |
102 | return udp_sk(sk)->no_check6_rx; | |
103 | } | |
104 | ||
2abb7cdc TH |
105 | static inline void udp_set_convert_csum(struct sock *sk, bool val) |
106 | { | |
107 | udp_sk(sk)->convert_csum = val; | |
108 | } | |
109 | ||
110 | static inline bool udp_get_convert_csum(struct sock *sk) | |
111 | { | |
112 | return udp_sk(sk)->convert_csum; | |
113 | } | |
114 | ||
30fff923 ED |
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 | ||
ba4e58ec | 121 | #define IS_UDPLITE(__sk) (udp_sk(__sk)->pcflag) |
1da177e4 | 122 | |
1da177e4 | 123 | #endif /* _LINUX_UDP_H */ |