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
udp_hdr(const struct sk_buff * skb)25 static inline struct udphdr *udp_hdr(const struct sk_buff *skb)
26 {
27 return (struct udphdr *)skb_transport_header(skb);
28 }
29
inner_udp_hdr(const struct sk_buff * skb)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
udp_hashfn(struct net * net,unsigned num,unsigned mask)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 convert_csum:1;/* On receive, convert checksum
54 * unnecessary to checksum complete
55 * if possible.
56 */
57 /*
58 * Following member retains the information to create a UDP header
59 * when the socket is uncorked.
60 */
61 __u16 len; /* total length of pending frames */
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 */
72 __u8 unused[3];
73 /*
74 * For encapsulation sockets.
75 */
76 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
77 void (*encap_destroy)(struct sock *sk);
78 };
79
udp_sk(const struct sock * sk)80 static inline struct udp_sock *udp_sk(const struct sock *sk)
81 {
82 return (struct udp_sock *)sk;
83 }
84
udp_set_no_check6_tx(struct sock * sk,bool val)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
udp_set_no_check6_rx(struct sock * sk,bool val)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
udp_get_no_check6_tx(struct sock * sk)95 static inline bool udp_get_no_check6_tx(struct sock *sk)
96 {
97 return udp_sk(sk)->no_check6_tx;
98 }
99
udp_get_no_check6_rx(struct sock * sk)100 static inline bool udp_get_no_check6_rx(struct sock *sk)
101 {
102 return udp_sk(sk)->no_check6_rx;
103 }
104
udp_set_convert_csum(struct sock * sk,bool val)105 static inline void udp_set_convert_csum(struct sock *sk, bool val)
106 {
107 udp_sk(sk)->convert_csum = val;
108 }
109
udp_get_convert_csum(struct sock * sk)110 static inline bool udp_get_convert_csum(struct sock *sk)
111 {
112 return udp_sk(sk)->convert_csum;
113 }
114
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
121 #define IS_UDPLITE(__sk) (udp_sk(__sk)->pcflag)
122
123 #endif /* _LINUX_UDP_H */
124