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 11 #if IS_ENABLED(CONFIG_UNIX) 12 struct unix_sock *unix_get_socket(struct file *filp); 13 #else 14 static inline struct unix_sock *unix_get_socket(struct file *filp) 15 { 16 return NULL; 17 } 18 #endif 19 20 extern spinlock_t unix_gc_lock; 21 extern unsigned int unix_tot_inflight; 22 23 void unix_inflight(struct user_struct *user, struct file *fp); 24 void unix_notinflight(struct user_struct *user, struct file *fp); 25 void unix_gc(void); 26 void wait_for_unix_gc(struct scm_fp_list *fpl); 27 28 struct sock *unix_peer_get(struct sock *sk); 29 30 #define UNIX_HASH_MOD (256 - 1) 31 #define UNIX_HASH_SIZE (256 * 2) 32 #define UNIX_HASH_BITS 8 33 34 struct unix_address { 35 refcount_t refcnt; 36 int len; 37 struct sockaddr_un name[]; 38 }; 39 40 struct unix_skb_parms { 41 struct pid *pid; /* Skb credentials */ 42 kuid_t uid; 43 kgid_t gid; 44 struct scm_fp_list *fp; /* Passed files */ 45 #ifdef CONFIG_SECURITY_NETWORK 46 u32 secid; /* Security ID */ 47 #endif 48 u32 consumed; 49 } __randomize_layout; 50 51 struct scm_stat { 52 atomic_t nr_fds; 53 }; 54 55 #define UNIXCB(skb) (*(struct unix_skb_parms *)&((skb)->cb)) 56 57 /* The AF_UNIX socket */ 58 struct unix_sock { 59 /* WARNING: sk has to be the first member */ 60 struct sock sk; 61 struct unix_address *addr; 62 struct path path; 63 struct mutex iolock, bindlock; 64 struct sock *peer; 65 struct list_head link; 66 unsigned long inflight; 67 spinlock_t lock; 68 unsigned long gc_flags; 69 #define UNIX_GC_CANDIDATE 0 70 #define UNIX_GC_MAYBE_CYCLE 1 71 struct socket_wq peer_wq; 72 wait_queue_entry_t peer_wake; 73 struct scm_stat scm_stat; 74 #if IS_ENABLED(CONFIG_AF_UNIX_OOB) 75 struct sk_buff *oob_skb; 76 #endif 77 }; 78 79 #define unix_sk(ptr) container_of_const(ptr, struct unix_sock, sk) 80 #define unix_peer(sk) (unix_sk(sk)->peer) 81 82 #define unix_state_lock(s) spin_lock(&unix_sk(s)->lock) 83 #define unix_state_unlock(s) spin_unlock(&unix_sk(s)->lock) 84 enum unix_socket_lock_class { 85 U_LOCK_NORMAL, 86 U_LOCK_SECOND, /* for double locking, see unix_state_double_lock(). */ 87 U_LOCK_DIAG, /* used while dumping icons, see sk_diag_dump_icons(). */ 88 U_LOCK_GC_LISTENER, /* used for listening socket while determining gc 89 * candidates to close a small race window. 90 */ 91 }; 92 93 static inline void unix_state_lock_nested(struct sock *sk, 94 enum unix_socket_lock_class subclass) 95 { 96 spin_lock_nested(&unix_sk(sk)->lock, subclass); 97 } 98 99 #define peer_wait peer_wq.wait 100 101 long unix_inq_len(struct sock *sk); 102 long unix_outq_len(struct sock *sk); 103 104 int __unix_dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t size, 105 int flags); 106 int __unix_stream_recvmsg(struct sock *sk, struct msghdr *msg, size_t size, 107 int flags); 108 #ifdef CONFIG_SYSCTL 109 int unix_sysctl_register(struct net *net); 110 void unix_sysctl_unregister(struct net *net); 111 #else 112 static inline int unix_sysctl_register(struct net *net) { return 0; } 113 static inline void unix_sysctl_unregister(struct net *net) {} 114 #endif 115 116 #ifdef CONFIG_BPF_SYSCALL 117 extern struct proto unix_dgram_proto; 118 extern struct proto unix_stream_proto; 119 120 int unix_dgram_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore); 121 int unix_stream_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore); 122 void __init unix_bpf_build_proto(void); 123 #else 124 static inline void __init unix_bpf_build_proto(void) 125 {} 126 #endif 127 #endif 128