Commit | Line | Data |
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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 | |
6eada011 | 37 | static inline u32 udp_hashfn(const struct net *net, u32 num, u32 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? */ | |
60fb9567 | 52 | no_check6_rx:1,/* Allow zero UDP6 checksums on RX? */ |
e20cf8d3 | 53 | encap_enabled:1, /* This socket enabled encap |
60fb9567 PA |
54 | * processing; UDP tunnels and |
55 | * different encapsulation layer set | |
56 | * this | |
57 | */ | |
e20cf8d3 | 58 | gro_enabled:1; /* Can accept GRO packets */ |
1da177e4 | 59 | /* |
47bdd718 | 60 | * Following member retains the information to create a UDP header |
1da177e4 LT |
61 | * when the socket is uncorked. |
62 | */ | |
63 | __u16 len; /* total length of pending frames */ | |
bec1f6f6 | 64 | __u16 gso_size; |
ba4e58ec GR |
65 | /* |
66 | * Fields specific to UDP-Lite. | |
67 | */ | |
68 | __u16 pcslen; | |
69 | __u16 pcrlen; | |
70 | /* indicator bits used by pcflag: */ | |
71 | #define UDPLITE_BIT 0x1 /* set by udplite proto init function */ | |
72 | #define UDPLITE_SEND_CC 0x2 /* set via udplite setsockopt */ | |
73 | #define UDPLITE_RECV_CC 0x4 /* set via udplite setsocktopt */ | |
74 | __u8 pcflag; /* marks socket as UDP-Lite if > 0 */ | |
342f0234 JC |
75 | __u8 unused[3]; |
76 | /* | |
77 | * For encapsulation sockets. | |
78 | */ | |
79 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); | |
44046a59 | 80 | void (*encap_destroy)(struct sock *sk); |
a6024562 TH |
81 | |
82 | /* GRO functions for UDP socket */ | |
d4546c25 DM |
83 | struct sk_buff * (*gro_receive)(struct sock *sk, |
84 | struct list_head *head, | |
a6024562 TH |
85 | struct sk_buff *skb); |
86 | int (*gro_complete)(struct sock *sk, | |
87 | struct sk_buff *skb, | |
88 | int nhoff); | |
6b229cf7 | 89 | |
2276f58a PA |
90 | /* udp_recvmsg try to use this before splicing sk_receive_queue */ |
91 | struct sk_buff_head reader_queue ____cacheline_aligned_in_smp; | |
92 | ||
6b229cf7 ED |
93 | /* This field is dirtied by udp_recvmsg() */ |
94 | int forward_deficit; | |
1da177e4 LT |
95 | }; |
96 | ||
bec1f6f6 WB |
97 | #define UDP_MAX_SEGMENTS (1 << 6UL) |
98 | ||
1da177e4 LT |
99 | static inline struct udp_sock *udp_sk(const struct sock *sk) |
100 | { | |
101 | return (struct udp_sock *)sk; | |
102 | } | |
e898d4db | 103 | |
1c19448c TH |
104 | static inline void udp_set_no_check6_tx(struct sock *sk, bool val) |
105 | { | |
106 | udp_sk(sk)->no_check6_tx = val; | |
107 | } | |
108 | ||
109 | static inline void udp_set_no_check6_rx(struct sock *sk, bool val) | |
110 | { | |
111 | udp_sk(sk)->no_check6_rx = val; | |
112 | } | |
113 | ||
114 | static inline bool udp_get_no_check6_tx(struct sock *sk) | |
115 | { | |
116 | return udp_sk(sk)->no_check6_tx; | |
117 | } | |
118 | ||
119 | static inline bool udp_get_no_check6_rx(struct sock *sk) | |
120 | { | |
121 | return udp_sk(sk)->no_check6_rx; | |
122 | } | |
123 | ||
bcd1665e PA |
124 | static inline void udp_cmsg_recv(struct msghdr *msg, struct sock *sk, |
125 | struct sk_buff *skb) | |
126 | { | |
127 | int gso_size; | |
128 | ||
129 | if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) { | |
130 | gso_size = skb_shinfo(skb)->gso_size; | |
131 | put_cmsg(msg, SOL_UDP, UDP_GRO, sizeof(gso_size), &gso_size); | |
132 | } | |
133 | } | |
134 | ||
ca065d0c ED |
135 | #define udp_portaddr_for_each_entry(__sk, list) \ |
136 | hlist_for_each_entry(__sk, list, __sk_common.skc_portaddr_node) | |
30fff923 | 137 | |
ca065d0c ED |
138 | #define udp_portaddr_for_each_entry_rcu(__sk, list) \ |
139 | hlist_for_each_entry_rcu(__sk, list, __sk_common.skc_portaddr_node) | |
30fff923 | 140 | |
3d8417d7 | 141 | #define IS_UDPLITE(__sk) (__sk->sk_protocol == IPPROTO_UDPLITE) |
1da177e4 | 142 | |
1da177e4 | 143 | #endif /* _LINUX_UDP_H */ |