1 /* SPDX-License-Identifier: GPL-2.0-or-later */
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.
7 * Definitions for the UDP protocol.
9 * Version: @(#)udp.h 1.0.2 04/28/93
11 * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
16 #include <net/inet_sock.h>
17 #include <linux/skbuff.h>
18 #include <net/netns/hash.h>
19 #include <uapi/linux/udp.h>
21 static inline struct udphdr
*udp_hdr(const struct sk_buff
*skb
)
23 return (struct udphdr
*)skb_transport_header(skb
);
26 static inline struct udphdr
*inner_udp_hdr(const struct sk_buff
*skb
)
28 return (struct udphdr
*)skb_inner_transport_header(skb
);
31 #define UDP_HTABLE_SIZE_MIN (CONFIG_BASE_SMALL ? 128 : 256)
33 static inline u32
udp_hashfn(const struct net
*net
, u32 num
, u32 mask
)
35 return (num
+ net_hash_mix(net
)) & mask
;
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
54 gro_enabled
:1; /* Can accept GRO packets */
56 * Following member retains the information to create a UDP header
57 * when the socket is uncorked.
59 __u16 len
; /* total length of pending frames */
62 * Fields specific to UDP-Lite.
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 */
73 * For encapsulation sockets.
75 int (*encap_rcv
)(struct sock
*sk
, struct sk_buff
*skb
);
76 int (*encap_err_lookup
)(struct sock
*sk
, struct sk_buff
*skb
);
77 void (*encap_destroy
)(struct sock
*sk
);
79 /* GRO functions for UDP socket */
80 struct sk_buff
* (*gro_receive
)(struct sock
*sk
,
81 struct list_head
*head
,
83 int (*gro_complete
)(struct sock
*sk
,
87 /* udp_recvmsg try to use this before splicing sk_receive_queue */
88 struct sk_buff_head reader_queue ____cacheline_aligned_in_smp
;
90 /* This field is dirtied by udp_recvmsg() */
94 #define UDP_MAX_SEGMENTS (1 << 6UL)
96 static inline struct udp_sock
*udp_sk(const struct sock
*sk
)
98 return (struct udp_sock
*)sk
;
101 static inline void udp_set_no_check6_tx(struct sock
*sk
, bool val
)
103 udp_sk(sk
)->no_check6_tx
= val
;
106 static inline void udp_set_no_check6_rx(struct sock
*sk
, bool val
)
108 udp_sk(sk
)->no_check6_rx
= val
;
111 static inline bool udp_get_no_check6_tx(struct sock
*sk
)
113 return udp_sk(sk
)->no_check6_tx
;
116 static inline bool udp_get_no_check6_rx(struct sock
*sk
)
118 return udp_sk(sk
)->no_check6_rx
;
121 static inline void udp_cmsg_recv(struct msghdr
*msg
, struct sock
*sk
,
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
);
132 static inline bool udp_unexpected_gso(struct sock
*sk
, struct sk_buff
*skb
)
134 return !udp_sk(sk
)->gro_enabled
&& skb_is_gso(skb
) &&
135 skb_shinfo(skb
)->gso_type
& SKB_GSO_UDP_L4
;
138 #define udp_portaddr_for_each_entry(__sk, list) \
139 hlist_for_each_entry(__sk, list, __sk_common.skc_portaddr_node)
141 #define udp_portaddr_for_each_entry_rcu(__sk, list) \
142 hlist_for_each_entry_rcu(__sk, list, __sk_common.skc_portaddr_node)
144 #define IS_UDPLITE(__sk) (__sk->sk_protocol == IPPROTO_UDPLITE)
146 #endif /* _LINUX_UDP_H */