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