| | 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 | |
| | 21 | static inline struct udphdr *udp_hdr(const struct sk_buff *skb) |
| | 22 | { |
| | 23 | return (struct udphdr *)skb_transport_header(skb); |
| | 24 | } |
| | 25 | |
| | 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 | |
| | 31 | #define UDP_HTABLE_SIZE_MIN (CONFIG_BASE_SMALL ? 128 : 256) |
| | 32 | |
| | 33 | static inline u32 udp_hashfn(const struct net *net, u32 num, u32 mask) |
| | 34 | { |
| | 35 | return (num + net_hash_mix(net)) & mask; |
| | 36 | } |
| | 37 | |
| | 38 | struct 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; /* Can accept GRO packets */ |
| | 55 | /* |
| | 56 | * Following member retains the information to create a UDP header |
| | 57 | * when the socket is uncorked. |
| | 58 | */ |
| | 59 | __u16 len; /* total length of pending frames */ |
| | 60 | __u16 gso_size; |
| | 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 */ |
| | 71 | __u8 unused[3]; |
| | 72 | /* |
| | 73 | * For encapsulation sockets. |
| | 74 | */ |
| | 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); |
| | 78 | |
| | 79 | /* GRO functions for UDP socket */ |
| | 80 | struct sk_buff * (*gro_receive)(struct sock *sk, |
| | 81 | struct list_head *head, |
| | 82 | struct sk_buff *skb); |
| | 83 | int (*gro_complete)(struct sock *sk, |
| | 84 | struct sk_buff *skb, |
| | 85 | int nhoff); |
| | 86 | |
| | 87 | /* udp_recvmsg try to use this before splicing sk_receive_queue */ |
| | 88 | struct sk_buff_head reader_queue ____cacheline_aligned_in_smp; |
| | 89 | |
| | 90 | /* This field is dirtied by udp_recvmsg() */ |
| | 91 | int forward_deficit; |
| | 92 | }; |
| | 93 | |
| | 94 | #define UDP_MAX_SEGMENTS (1 << 6UL) |
| | 95 | |
| | 96 | static inline struct udp_sock *udp_sk(const struct sock *sk) |
| | 97 | { |
| | 98 | return (struct udp_sock *)sk; |
| | 99 | } |
| | 100 | |
| | 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 | |
| | 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 | |
| | 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 | |
| | 138 | #define udp_portaddr_for_each_entry(__sk, list) \ |
| | 139 | hlist_for_each_entry(__sk, list, __sk_common.skc_portaddr_node) |
| | 140 | |
| | 141 | #define udp_portaddr_for_each_entry_rcu(__sk, list) \ |
| | 142 | hlist_for_each_entry_rcu(__sk, list, __sk_common.skc_portaddr_node) |
| | 143 | |
| | 144 | #define IS_UDPLITE(__sk) (__sk->sk_protocol == IPPROTO_UDPLITE) |
| | 145 | |
| | 146 | #endif /* _LINUX_UDP_H */ |
projects / linux-2.6-block.git / blame_incremental