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 io_uring_destruct_scm(struct sk_buff *skb); 15void unix_gc(void); 16void wait_for_unix_gc(void); 17struct sock *unix_get_socket(struct file *filp); 18struct sock *unix_peer_get(struct sock *sk); 19 20#define UNIX_HASH_MOD (256 - 1) 21#define UNIX_HASH_SIZE (256 * 2) 22#define UNIX_HASH_BITS 8 23 24extern unsigned int unix_tot_inflight; 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/* The AF_UNIX socket */ 50struct unix_sock { 51 /* WARNING: sk has to be the first member */ 52 struct sock sk; 53 struct unix_address *addr; 54 struct path path; 55 struct mutex iolock, bindlock; 56 struct sock *peer; 57 struct list_head link; 58 atomic_long_t inflight; 59 spinlock_t lock; 60 unsigned long gc_flags; 61#define UNIX_GC_CANDIDATE 0 62#define UNIX_GC_MAYBE_CYCLE 1 63 struct socket_wq peer_wq; 64 wait_queue_entry_t peer_wake; 65 struct scm_stat scm_stat; 66#if IS_ENABLED(CONFIG_AF_UNIX_OOB) 67 struct sk_buff *oob_skb; 68#endif 69}; 70 71#define unix_sk(ptr) container_of_const(ptr, struct unix_sock, sk) 72#define unix_peer(sk) (unix_sk(sk)->peer) 73 74#define unix_state_lock(s) spin_lock(&unix_sk(s)->lock) 75#define unix_state_unlock(s) spin_unlock(&unix_sk(s)->lock) 76enum unix_socket_lock_class { 77 U_LOCK_NORMAL, 78 U_LOCK_SECOND, /* for double locking, see unix_state_double_lock(). */ 79 U_LOCK_DIAG, /* used while dumping icons, see sk_diag_dump_icons(). */ 80}; 81 82static inline void unix_state_lock_nested(struct sock *sk, 83 enum unix_socket_lock_class subclass) 84{ 85 spin_lock_nested(&unix_sk(sk)->lock, subclass); 86} 87 88#define peer_wait peer_wq.wait 89 90long unix_inq_len(struct sock *sk); 91long unix_outq_len(struct sock *sk); 92 93int __unix_dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t size, 94 int flags); 95int __unix_stream_recvmsg(struct sock *sk, struct msghdr *msg, size_t size, 96 int flags); 97#ifdef CONFIG_SYSCTL 98int unix_sysctl_register(struct net *net); 99void unix_sysctl_unregister(struct net *net); 100#else 101static inline int unix_sysctl_register(struct net *net) { return 0; } 102static inline void unix_sysctl_unregister(struct net *net) {} 103#endif 104 105#ifdef CONFIG_BPF_SYSCALL 106extern struct proto unix_dgram_proto; 107extern struct proto unix_stream_proto; 108 109int unix_dgram_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore); 110int unix_stream_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore); 111void __init unix_bpf_build_proto(void); 112#else 113static inline void __init unix_bpf_build_proto(void) 114{} 115#endif 116#endif 117