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1/* SPDX-License-Identifier: GPL-2.0-or-later */
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>
12 */
13#ifndef _LINUX_UDP_H
14#define _LINUX_UDP_H
15
16#include <net/inet_sock.h>
17#include <linux/skbuff.h>
18#include <net/netns/hash.h>
19#include <uapi/linux/udp.h>
20
21static inline struct udphdr *udp_hdr(const struct sk_buff *skb)
22{
23 return (struct udphdr *)skb_transport_header(skb);
24}
25
26static inline struct udphdr *inner_udp_hdr(const struct sk_buff *skb)
27{
28 return (struct udphdr *)skb_inner_transport_header(skb);
29}
30
31#define UDP_HTABLE_SIZE_MIN (CONFIG_BASE_SMALL ? 128 : 256)
32
33static inline u32 udp_hashfn(const struct net *net, u32 num, u32 mask)
34{
35 return (num + net_hash_mix(net)) & mask;
36}
37
38struct udp_sock {
39 /* inet_sock has to be the first member */
40 struct inet_sock inet;
41#define udp_port_hash inet.sk.__sk_common.skc_u16hashes[0]
42#define udp_portaddr_hash inet.sk.__sk_common.skc_u16hashes[1]
43#define udp_portaddr_node inet.sk.__sk_common.skc_portaddr_node
44 int pending; /* Any pending frames ? */
45 unsigned int corkflag; /* Cork is required */
46 __u8 encap_type; /* Is this an Encapsulation socket? */
47 unsigned char no_check6_tx:1,/* Send zero UDP6 checksums on TX? */
48 no_check6_rx:1,/* Allow zero UDP6 checksums on RX? */
49 encap_enabled:1, /* This socket enabled encap
50 * processing; UDP tunnels and
51 * different encapsulation layer set
52 * this
53 */
54 gro_enabled:1, /* Request GRO aggregation */
55 accept_udp_l4:1,
56 accept_udp_fraglist:1;
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 __u16 gso_size;
63 /*
64 * Fields specific to UDP-Lite.
65 */
66 __u16 pcslen;
67 __u16 pcrlen;
68/* indicator bits used by pcflag: */
69#define UDPLITE_BIT 0x1 /* set by udplite proto init function */
70#define UDPLITE_SEND_CC 0x2 /* set via udplite setsockopt */
71#define UDPLITE_RECV_CC 0x4 /* set via udplite setsocktopt */
72 __u8 pcflag; /* marks socket as UDP-Lite if > 0 */
73 __u8 unused[3];
74 /*
75 * For encapsulation sockets.
76 */
77 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
78 int (*encap_err_lookup)(struct sock *sk, struct sk_buff *skb);
79 void (*encap_destroy)(struct sock *sk);
80
81 /* GRO functions for UDP socket */
82 struct sk_buff * (*gro_receive)(struct sock *sk,
83 struct list_head *head,
84 struct sk_buff *skb);
85 int (*gro_complete)(struct sock *sk,
86 struct sk_buff *skb,
87 int nhoff);
88
89 /* udp_recvmsg try to use this before splicing sk_receive_queue */
90 struct sk_buff_head reader_queue ____cacheline_aligned_in_smp;
91
92 /* This field is dirtied by udp_recvmsg() */
93 int forward_deficit;
94};
95
96#define UDP_MAX_SEGMENTS (1 << 6UL)
97
98static inline struct udp_sock *udp_sk(const struct sock *sk)
99{
100 return (struct udp_sock *)sk;
101}
102
103static inline void udp_set_no_check6_tx(struct sock *sk, bool val)
104{
105 udp_sk(sk)->no_check6_tx = val;
106}
107
108static inline void udp_set_no_check6_rx(struct sock *sk, bool val)
109{
110 udp_sk(sk)->no_check6_rx = val;
111}
112
113static inline bool udp_get_no_check6_tx(struct sock *sk)
114{
115 return udp_sk(sk)->no_check6_tx;
116}
117
118static inline bool udp_get_no_check6_rx(struct sock *sk)
119{
120 return udp_sk(sk)->no_check6_rx;
121}
122
123static inline void udp_cmsg_recv(struct msghdr *msg, struct sock *sk,
124 struct sk_buff *skb)
125{
126 int gso_size;
127
128 if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) {
129 gso_size = skb_shinfo(skb)->gso_size;
130 put_cmsg(msg, SOL_UDP, UDP_GRO, sizeof(gso_size), &gso_size);
131 }
132}
133
134static inline bool udp_unexpected_gso(struct sock *sk, struct sk_buff *skb)
135{
136 if (!skb_is_gso(skb))
137 return false;
138
139 if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4 && !udp_sk(sk)->accept_udp_l4)
140 return true;
141
142 if (skb_shinfo(skb)->gso_type & SKB_GSO_FRAGLIST && !udp_sk(sk)->accept_udp_fraglist)
143 return true;
144
145 return false;
146}
147
148static inline void udp_allow_gso(struct sock *sk)
149{
150 udp_sk(sk)->accept_udp_l4 = 1;
151 udp_sk(sk)->accept_udp_fraglist = 1;
152}
153
154#define udp_portaddr_for_each_entry(__sk, list) \
155 hlist_for_each_entry(__sk, list, __sk_common.skc_portaddr_node)
156
157#define udp_portaddr_for_each_entry_rcu(__sk, list) \
158 hlist_for_each_entry_rcu(__sk, list, __sk_common.skc_portaddr_node)
159
160#define IS_UDPLITE(__sk) (__sk->sk_protocol == IPPROTO_UDPLITE)
161
162#endif /* _LINUX_UDP_H */