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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243/* 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_PERNET 128#define UDP_HTABLE_SIZE_MIN (IS_ENABLED(CONFIG_BASE_SMALL) ? 128 : 256)#define UDP_HTABLE_SIZE_MAX 65536
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 */};
/* per NUMA structure for lockless producer usage. */struct udp_prod_queue { struct llist_head ll_root ____cacheline_aligned_in_smp; atomic_t rmem_alloc;};
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? */
#if !IS_ENABLED(CONFIG_BASE_SMALL) /* For UDP 4-tuple hash */ __u16 udp_lrpa_hash; struct hlist_nulls_node udp_lrpa_node;#endif
/* * 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;
/* * For encapsulation sockets. */ int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); void (*encap_err_rcv)(struct sock *sk, struct sk_buff *skb, int err, __be16 port, u32 info, u8 *payload); 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);
struct udp_prod_queue *udp_prod_queue;
/* 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;
/* This fields follows rcvbuf value, and is touched by udp_recvmsg */ int forward_threshold;
/* Cache friendly copy of sk->sk_peek_off >= 0 */ bool peeking_with_offset;
/* * Accounting for the tunnel GRO fastpath. * Unprotected by compilers guard, as it uses space available in * the last UDP socket cacheline. */ struct hlist_node tunnel_list; struct numa_drop_counters drop_counters;};
#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 << 7UL)
#define udp_sk(ptr) container_of_const(ptr, struct udp_sock, inet.sk)
static inline int udp_set_peek_off(struct sock *sk, int val){ sk_set_peek_off(sk, val); WRITE_ONCE(udp_sk(sk)->peeking_with_offset, val >= 0); return 0;}
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); }}
DECLARE_STATIC_KEY_FALSE(udp_encap_needed_key);#if IS_ENABLED(CONFIG_IPV6)DECLARE_STATIC_KEY_FALSE(udpv6_encap_needed_key);#endif
static inline bool udp_encap_needed(void){ if (static_branch_unlikely(&udp_encap_needed_key)) return true;
#if IS_ENABLED(CONFIG_IPV6) if (static_branch_unlikely(&udpv6_encap_needed_key)) return true;#endif
return false;}
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;
/* GSO packets lacking the SKB_GSO_UDP_TUNNEL/_CSUM bits might still * land in a tunnel as the socket check in udp_gro_receive cannot be * foolproof. */ if (udp_encap_needed() && READ_ONCE(udp_sk(sk)->encap_rcv) && !(skb_shinfo(skb)->gso_type & (SKB_GSO_UDP_TUNNEL | SKB_GSO_UDP_TUNNEL_CSUM))) 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_from(__sk) \ hlist_for_each_entry_from(__sk, __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)
#if !IS_ENABLED(CONFIG_BASE_SMALL)#define udp_lrpa_for_each_entry_rcu(__up, node, list) \ hlist_nulls_for_each_entry_rcu(__up, node, list, udp_lrpa_node)#endif
static inline struct sock *udp_tunnel_sk(const struct net *net, bool is_ipv6){#if IS_ENABLED(CONFIG_NET_UDP_TUNNEL) return rcu_dereference(net->ipv4.udp_tunnel_gro[is_ipv6].sk);#else return NULL;#endif}
#endif /* _LINUX_UDP_H */