af_unix.h (2980B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef __LINUX_NET_AFUNIX_H 3#define __LINUX_NET_AFUNIX_H 4 5#include <linux/socket.h> 6#include <linux/un.h> 7#include <linux/mutex.h> 8#include <linux/refcount.h> 9#include <net/sock.h> 10 11void unix_inflight(struct user_struct *user, struct file *fp); 12void unix_notinflight(struct user_struct *user, struct file *fp); 13void unix_destruct_scm(struct sk_buff *skb); 14void unix_gc(void); 15void wait_for_unix_gc(void); 16struct sock *unix_get_socket(struct file *filp); 17struct sock *unix_peer_get(struct sock *sk); 18 19#define UNIX_HASH_SIZE 256 20#define UNIX_HASH_BITS 8 21 22extern unsigned int unix_tot_inflight; 23extern spinlock_t unix_table_locks[2 * UNIX_HASH_SIZE]; 24extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE]; 25 26struct unix_address { 27 refcount_t refcnt; 28 int len; 29 struct sockaddr_un name[]; 30}; 31 32struct unix_skb_parms { 33 struct pid *pid; /* Skb credentials */ 34 kuid_t uid; 35 kgid_t gid; 36 struct scm_fp_list *fp; /* Passed files */ 37#ifdef CONFIG_SECURITY_NETWORK 38 u32 secid; /* Security ID */ 39#endif 40 u32 consumed; 41} __randomize_layout; 42 43struct scm_stat { 44 atomic_t nr_fds; 45}; 46 47#define UNIXCB(skb) (*(struct unix_skb_parms *)&((skb)->cb)) 48 49#define unix_state_lock(s) spin_lock(&unix_sk(s)->lock) 50#define unix_state_unlock(s) spin_unlock(&unix_sk(s)->lock) 51#define unix_state_lock_nested(s) \ 52 spin_lock_nested(&unix_sk(s)->lock, \ 53 SINGLE_DEPTH_NESTING) 54 55/* The AF_UNIX socket */ 56struct unix_sock { 57 /* WARNING: sk has to be the first member */ 58 struct sock sk; 59 struct unix_address *addr; 60 struct path path; 61 struct mutex iolock, bindlock; 62 struct sock *peer; 63 struct list_head link; 64 atomic_long_t inflight; 65 spinlock_t lock; 66 unsigned long gc_flags; 67#define UNIX_GC_CANDIDATE 0 68#define UNIX_GC_MAYBE_CYCLE 1 69 struct socket_wq peer_wq; 70 wait_queue_entry_t peer_wake; 71 struct scm_stat scm_stat; 72#if IS_ENABLED(CONFIG_AF_UNIX_OOB) 73 struct sk_buff *oob_skb; 74#endif 75}; 76 77static inline struct unix_sock *unix_sk(const struct sock *sk) 78{ 79 return (struct unix_sock *)sk; 80} 81 82#define peer_wait peer_wq.wait 83 84long unix_inq_len(struct sock *sk); 85long unix_outq_len(struct sock *sk); 86 87int __unix_dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t size, 88 int flags); 89int __unix_stream_recvmsg(struct sock *sk, struct msghdr *msg, size_t size, 90 int flags); 91#ifdef CONFIG_SYSCTL 92int unix_sysctl_register(struct net *net); 93void unix_sysctl_unregister(struct net *net); 94#else 95static inline int unix_sysctl_register(struct net *net) { return 0; } 96static inline void unix_sysctl_unregister(struct net *net) {} 97#endif 98 99#ifdef CONFIG_BPF_SYSCALL 100extern struct proto unix_dgram_proto; 101extern struct proto unix_stream_proto; 102 103int unix_dgram_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore); 104int unix_stream_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore); 105void __init unix_bpf_build_proto(void); 106#else 107static inline void __init unix_bpf_build_proto(void) 108{} 109#endif 110#endif