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156 lines
4.4 KiB
156 lines
4.4 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* INET An implementation of the TCP/IP protocol suite for the LINUX |
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* operating system. INET is implemented using the BSD Socket |
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* interface as the means of communication with the user level. |
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* |
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* Definitions for the UDP protocol. |
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* |
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* Version: @(#)udp.h 1.0.2 04/28/93 |
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* |
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* Author: Fred N. van Kempen, <[email protected]> |
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*/ |
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#ifndef _LINUX_UDP_H |
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#define _LINUX_UDP_H |
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#include <net/inet_sock.h> |
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#include <linux/skbuff.h> |
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#include <net/netns/hash.h> |
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#include <uapi/linux/udp.h> |
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static inline struct udphdr *udp_hdr(const struct sk_buff *skb) |
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{ |
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return (struct udphdr *)skb_transport_header(skb); |
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} |
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static inline struct udphdr *inner_udp_hdr(const struct sk_buff *skb) |
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{ |
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return (struct udphdr *)skb_inner_transport_header(skb); |
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} |
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#define UDP_HTABLE_SIZE_MIN (CONFIG_BASE_SMALL ? 128 : 256) |
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static inline u32 udp_hashfn(const struct net *net, u32 num, u32 mask) |
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{ |
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return (num + net_hash_mix(net)) & mask; |
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} |
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struct udp_sock { |
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/* inet_sock has to be the first member */ |
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struct inet_sock inet; |
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#define udp_port_hash inet.sk.__sk_common.skc_u16hashes[0] |
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#define udp_portaddr_hash inet.sk.__sk_common.skc_u16hashes[1] |
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#define udp_portaddr_node inet.sk.__sk_common.skc_portaddr_node |
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int pending; /* Any pending frames ? */ |
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unsigned int corkflag; /* Cork is required */ |
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__u8 encap_type; /* Is this an Encapsulation socket? */ |
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unsigned char no_check6_tx:1,/* Send zero UDP6 checksums on TX? */ |
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no_check6_rx:1,/* Allow zero UDP6 checksums on RX? */ |
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encap_enabled:1, /* This socket enabled encap |
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* processing; UDP tunnels and |
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* different encapsulation layer set |
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* this |
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*/ |
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gro_enabled:1, /* Request GRO aggregation */ |
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accept_udp_l4:1, |
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accept_udp_fraglist:1; |
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/* |
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* Following member retains the information to create a UDP header |
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* when the socket is uncorked. |
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*/ |
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__u16 len; /* total length of pending frames */ |
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__u16 gso_size; |
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/* |
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* Fields specific to UDP-Lite. |
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*/ |
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__u16 pcslen; |
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__u16 pcrlen; |
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/* indicator bits used by pcflag: */ |
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#define UDPLITE_BIT 0x1 /* set by udplite proto init function */ |
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#define UDPLITE_SEND_CC 0x2 /* set via udplite setsockopt */ |
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#define UDPLITE_RECV_CC 0x4 /* set via udplite setsocktopt */ |
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__u8 pcflag; /* marks socket as UDP-Lite if > 0 */ |
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__u8 unused[3]; |
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/* |
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* For encapsulation sockets. |
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*/ |
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int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); |
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int (*encap_err_lookup)(struct sock *sk, struct sk_buff *skb); |
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void (*encap_destroy)(struct sock *sk); |
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/* GRO functions for UDP socket */ |
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struct sk_buff * (*gro_receive)(struct sock *sk, |
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struct list_head *head, |
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struct sk_buff *skb); |
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int (*gro_complete)(struct sock *sk, |
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struct sk_buff *skb, |
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int nhoff); |
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/* udp_recvmsg try to use this before splicing sk_receive_queue */ |
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struct sk_buff_head reader_queue ____cacheline_aligned_in_smp; |
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/* This field is dirtied by udp_recvmsg() */ |
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int forward_deficit; |
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}; |
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#define UDP_MAX_SEGMENTS (1 << 6UL) |
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static inline struct udp_sock *udp_sk(const struct sock *sk) |
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{ |
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return (struct udp_sock *)sk; |
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} |
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static inline void udp_set_no_check6_tx(struct sock *sk, bool val) |
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{ |
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udp_sk(sk)->no_check6_tx = val; |
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} |
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static inline void udp_set_no_check6_rx(struct sock *sk, bool val) |
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{ |
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udp_sk(sk)->no_check6_rx = val; |
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} |
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static inline bool udp_get_no_check6_tx(struct sock *sk) |
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{ |
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return udp_sk(sk)->no_check6_tx; |
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} |
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static inline bool udp_get_no_check6_rx(struct sock *sk) |
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{ |
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return udp_sk(sk)->no_check6_rx; |
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} |
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static inline void udp_cmsg_recv(struct msghdr *msg, struct sock *sk, |
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struct sk_buff *skb) |
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{ |
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int gso_size; |
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if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) { |
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gso_size = skb_shinfo(skb)->gso_size; |
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put_cmsg(msg, SOL_UDP, UDP_GRO, sizeof(gso_size), &gso_size); |
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} |
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} |
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static inline bool udp_unexpected_gso(struct sock *sk, struct sk_buff *skb) |
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{ |
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if (!skb_is_gso(skb)) |
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return false; |
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if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4 && !udp_sk(sk)->accept_udp_l4) |
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return true; |
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if (skb_shinfo(skb)->gso_type & SKB_GSO_FRAGLIST && !udp_sk(sk)->accept_udp_fraglist) |
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return true; |
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return false; |
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} |
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#define udp_portaddr_for_each_entry(__sk, list) \ |
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hlist_for_each_entry(__sk, list, __sk_common.skc_portaddr_node) |
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#define udp_portaddr_for_each_entry_rcu(__sk, list) \ |
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hlist_for_each_entry_rcu(__sk, list, __sk_common.skc_portaddr_node) |
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#define IS_UDPLITE(__sk) (__sk->sk_protocol == IPPROTO_UDPLITE) |
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#endif /* _LINUX_UDP_H */
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