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
25 static inline struct udphdr *udp_hdr(const struct sk_buff *skb)
26 {
27 return (struct udphdr *)skb_transport_header(skb);
28 }
29
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
35 #define UDP_HTABLE_SIZE_MIN (CONFIG_BASE_SMALL ? 128 : 256)
36
37 static inline int udp_hashfn(struct net *net, unsigned num, unsigned mask)
38 {
39 return (num + net_hash_mix(net)) & mask;
40 }
41
42 struct 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 /*
54 * Following member retains the information to create a UDP header
55 * when the socket is uncorked.
56 */
57 __u16 len; /* total length of pending frames */
58 /*
59 * Fields specific to UDP-Lite.
60 */
61 __u16 pcslen;
62 __u16 pcrlen;
63 /* indicator bits used by pcflag: */
64 #define UDPLITE_BIT 0x1 /* set by udplite proto init function */
65 #define UDPLITE_SEND_CC 0x2 /* set via udplite setsockopt */
66 #define UDPLITE_RECV_CC 0x4 /* set via udplite setsocktopt */
67 __u8 pcflag; /* marks socket as UDP-Lite if > 0 */
68 __u8 unused[3];
69 /*
70 * For encapsulation sockets.
71 */
72 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
73 void (*encap_destroy)(struct sock *sk);
74 };
75
76 static inline struct udp_sock *udp_sk(const struct sock *sk)
77 {
78 return (struct udp_sock *)sk;
79 }
80
81 static inline void udp_set_no_check6_tx(struct sock *sk, bool val)
82 {
83 udp_sk(sk)->no_check6_tx = val;
84 }
85
86 static inline void udp_set_no_check6_rx(struct sock *sk, bool val)
87 {
88 udp_sk(sk)->no_check6_rx = val;
89 }
90
91 static inline bool udp_get_no_check6_tx(struct sock *sk)
92 {
93 return udp_sk(sk)->no_check6_tx;
94 }
95
96 static inline bool udp_get_no_check6_rx(struct sock *sk)
97 {
98 return udp_sk(sk)->no_check6_rx;
99 }
100
101 #define udp_portaddr_for_each_entry(__sk, node, list) \
102 hlist_nulls_for_each_entry(__sk, node, list, __sk_common.skc_portaddr_node)
103
104 #define udp_portaddr_for_each_entry_rcu(__sk, node, list) \
105 hlist_nulls_for_each_entry_rcu(__sk, node, list, __sk_common.skc_portaddr_node)
106
107 #define IS_UDPLITE(__sk) (udp_sk(__sk)->pcflag)
108
109 #endif /* _LINUX_UDP_H */
110
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