diff options
Diffstat (limited to 'include/linux/udp.h')
| -rw-r--r-- | include/linux/udp.h | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/include/linux/udp.h b/include/linux/udp.h new file mode 100644 index 000000000..efd9ab6df --- /dev/null +++ b/include/linux/udp.h @@ -0,0 +1,173 @@ +/* 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); +} + +#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; +} + +enum { + UDP_FLAGS_CORK, /* Cork is required */ + UDP_FLAGS_NO_CHECK6_TX, /* Send zero UDP6 checksums on TX? */ + UDP_FLAGS_NO_CHECK6_RX, /* Allow zero UDP6 checksums on RX? */ + UDP_FLAGS_GRO_ENABLED, /* Request GRO aggregation */ + UDP_FLAGS_ACCEPT_FRAGLIST, + UDP_FLAGS_ACCEPT_L4, + UDP_FLAGS_ENCAP_ENABLED, /* This socket enabled encap */ +}; + +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 + + unsigned long udp_flags; + + int pending; /* Any pending frames ? */ + __u8 encap_type; /* Is this an Encapsulation socket? */ + +/* 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 */ + /* + * 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; + /* + * For encapsulation sockets. + */ + int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); + void (*encap_err_rcv)(struct sock *sk, struct sk_buff *skb, unsigned int udp_offset); + 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_test_bit(nr, sk) \ + test_bit(UDP_FLAGS_##nr, &udp_sk(sk)->udp_flags) +#define udp_set_bit(nr, sk) \ + set_bit(UDP_FLAGS_##nr, &udp_sk(sk)->udp_flags) +#define udp_test_and_set_bit(nr, sk) \ + test_and_set_bit(UDP_FLAGS_##nr, &udp_sk(sk)->udp_flags) +#define udp_clear_bit(nr, sk) \ + clear_bit(UDP_FLAGS_##nr, &udp_sk(sk)->udp_flags) +#define udp_assign_bit(nr, sk, val) \ + assign_bit(UDP_FLAGS_##nr, &udp_sk(sk)->udp_flags, val) + +#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_assign_bit(NO_CHECK6_TX, sk, val); +} + +static inline void udp_set_no_check6_rx(struct sock *sk, bool val) +{ + udp_assign_bit(NO_CHECK6_RX, sk, val); +} + +static inline bool udp_get_no_check6_tx(const struct sock *sk) +{ + return udp_test_bit(NO_CHECK6_TX, sk); +} + +static inline bool udp_get_no_check6_rx(const struct sock *sk) +{ + return udp_test_bit(NO_CHECK6_RX, sk); +} + +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_test_bit(ACCEPT_L4, sk)) + return true; + + if (skb_shinfo(skb)->gso_type & SKB_GSO_FRAGLIST && + !udp_test_bit(ACCEPT_FRAGLIST, sk)) + return true; + + return false; +} + +static inline void udp_allow_gso(struct sock *sk) +{ + udp_set_bit(ACCEPT_L4, sk); + udp_set_bit(ACCEPT_FRAGLIST, sk); +} + +#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 */ |