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2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
1da177e4 LT |
2 | /* |
3 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
4 | * operating system. INET is implemented using the BSD Socket | |
5 | * interface as the means of communication with the user level. | |
6 | * | |
7 | * Definitions for the UDP protocol. | |
8 | * | |
9 | * Version: @(#)udp.h 1.0.2 04/28/93 | |
10 | * | |
11 | * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> | |
1da177e4 LT |
12 | */ |
13 | #ifndef _LINUX_UDP_H | |
14 | #define _LINUX_UDP_H | |
15 | ||
14c85021 | 16 | #include <net/inet_sock.h> |
310afe86 | 17 | #include <linux/skbuff.h> |
0b441916 | 18 | #include <net/netns/hash.h> |
607ca46e | 19 | #include <uapi/linux/udp.h> |
310afe86 JP |
20 | |
21 | static inline struct udphdr *udp_hdr(const struct sk_buff *skb) | |
22 | { | |
23 | return (struct udphdr *)skb_transport_header(skb); | |
24 | } | |
25 | ||
6a674e9c JG |
26 | static inline struct udphdr *inner_udp_hdr(const struct sk_buff *skb) |
27 | { | |
28 | return (struct udphdr *)skb_inner_transport_header(skb); | |
29 | } | |
30 | ||
f86dcc5a | 31 | #define UDP_HTABLE_SIZE_MIN (CONFIG_BASE_SMALL ? 128 : 256) |
1da177e4 | 32 | |
6eada011 | 33 | static inline u32 udp_hashfn(const struct net *net, u32 num, u32 mask) |
d6266281 | 34 | { |
f86dcc5a | 35 | return (num + net_hash_mix(net)) & mask; |
d6266281 PE |
36 | } |
37 | ||
1da177e4 LT |
38 | struct udp_sock { |
39 | /* inet_sock has to be the first member */ | |
40 | struct inet_sock inet; | |
d4cada4a ED |
41 | #define udp_port_hash inet.sk.__sk_common.skc_u16hashes[0] |
42 | #define udp_portaddr_hash inet.sk.__sk_common.skc_u16hashes[1] | |
512615b6 | 43 | #define udp_portaddr_node inet.sk.__sk_common.skc_portaddr_node |
1da177e4 LT |
44 | int pending; /* Any pending frames ? */ |
45 | unsigned int corkflag; /* Cork is required */ | |
1c19448c TH |
46 | __u8 encap_type; /* Is this an Encapsulation socket? */ |
47 | unsigned char no_check6_tx:1,/* Send zero UDP6 checksums on TX? */ | |
60fb9567 | 48 | no_check6_rx:1,/* Allow zero UDP6 checksums on RX? */ |
e20cf8d3 | 49 | encap_enabled:1, /* This socket enabled encap |
60fb9567 PA |
50 | * processing; UDP tunnels and |
51 | * different encapsulation layer set | |
52 | * this | |
53 | */ | |
e20cf8d3 | 54 | gro_enabled:1; /* Can accept GRO packets */ |
1da177e4 | 55 | /* |
47bdd718 | 56 | * Following member retains the information to create a UDP header |
1da177e4 LT |
57 | * when the socket is uncorked. |
58 | */ | |
59 | __u16 len; /* total length of pending frames */ | |
bec1f6f6 | 60 | __u16 gso_size; |
ba4e58ec GR |
61 | /* |
62 | * Fields specific to UDP-Lite. | |
63 | */ | |
64 | __u16 pcslen; | |
65 | __u16 pcrlen; | |
66 | /* indicator bits used by pcflag: */ | |
67 | #define UDPLITE_BIT 0x1 /* set by udplite proto init function */ | |
68 | #define UDPLITE_SEND_CC 0x2 /* set via udplite setsockopt */ | |
69 | #define UDPLITE_RECV_CC 0x4 /* set via udplite setsocktopt */ | |
70 | __u8 pcflag; /* marks socket as UDP-Lite if > 0 */ | |
342f0234 JC |
71 | __u8 unused[3]; |
72 | /* | |
73 | * For encapsulation sockets. | |
74 | */ | |
75 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); | |
a36e185e | 76 | int (*encap_err_lookup)(struct sock *sk, struct sk_buff *skb); |
44046a59 | 77 | void (*encap_destroy)(struct sock *sk); |
a6024562 TH |
78 | |
79 | /* GRO functions for UDP socket */ | |
d4546c25 DM |
80 | struct sk_buff * (*gro_receive)(struct sock *sk, |
81 | struct list_head *head, | |
a6024562 TH |
82 | struct sk_buff *skb); |
83 | int (*gro_complete)(struct sock *sk, | |
84 | struct sk_buff *skb, | |
85 | int nhoff); | |
6b229cf7 | 86 | |
2276f58a PA |
87 | /* udp_recvmsg try to use this before splicing sk_receive_queue */ |
88 | struct sk_buff_head reader_queue ____cacheline_aligned_in_smp; | |
89 | ||
6b229cf7 ED |
90 | /* This field is dirtied by udp_recvmsg() */ |
91 | int forward_deficit; | |
1da177e4 LT |
92 | }; |
93 | ||
bec1f6f6 WB |
94 | #define UDP_MAX_SEGMENTS (1 << 6UL) |
95 | ||
1da177e4 LT |
96 | static inline struct udp_sock *udp_sk(const struct sock *sk) |
97 | { | |
98 | return (struct udp_sock *)sk; | |
99 | } | |
e898d4db | 100 | |
1c19448c TH |
101 | static inline void udp_set_no_check6_tx(struct sock *sk, bool val) |
102 | { | |
103 | udp_sk(sk)->no_check6_tx = val; | |
104 | } | |
105 | ||
106 | static inline void udp_set_no_check6_rx(struct sock *sk, bool val) | |
107 | { | |
108 | udp_sk(sk)->no_check6_rx = val; | |
109 | } | |
110 | ||
111 | static inline bool udp_get_no_check6_tx(struct sock *sk) | |
112 | { | |
113 | return udp_sk(sk)->no_check6_tx; | |
114 | } | |
115 | ||
116 | static inline bool udp_get_no_check6_rx(struct sock *sk) | |
117 | { | |
118 | return udp_sk(sk)->no_check6_rx; | |
119 | } | |
120 | ||
bcd1665e PA |
121 | static inline void udp_cmsg_recv(struct msghdr *msg, struct sock *sk, |
122 | struct sk_buff *skb) | |
123 | { | |
124 | int gso_size; | |
125 | ||
126 | if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) { | |
127 | gso_size = skb_shinfo(skb)->gso_size; | |
128 | put_cmsg(msg, SOL_UDP, UDP_GRO, sizeof(gso_size), &gso_size); | |
129 | } | |
130 | } | |
131 | ||
cf329aa4 PA |
132 | static inline bool udp_unexpected_gso(struct sock *sk, struct sk_buff *skb) |
133 | { | |
134 | return !udp_sk(sk)->gro_enabled && skb_is_gso(skb) && | |
135 | skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4; | |
136 | } | |
137 | ||
ca065d0c ED |
138 | #define udp_portaddr_for_each_entry(__sk, list) \ |
139 | hlist_for_each_entry(__sk, list, __sk_common.skc_portaddr_node) | |
30fff923 | 140 | |
ca065d0c ED |
141 | #define udp_portaddr_for_each_entry_rcu(__sk, list) \ |
142 | hlist_for_each_entry_rcu(__sk, list, __sk_common.skc_portaddr_node) | |
30fff923 | 143 | |
3d8417d7 | 144 | #define IS_UDPLITE(__sk) (__sk->sk_protocol == IPPROTO_UDPLITE) |
1da177e4 | 145 | |
1da177e4 | 146 | #endif /* _LINUX_UDP_H */ |