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 void unix_inflight(struct user_struct *user, struct file *fp); 12 void unix_notinflight(struct user_struct *user, struct file *fp); 13 void unix_destruct_scm(struct sk_buff *skb); 14 void unix_gc(void); 15 void wait_for_unix_gc(void); 16 struct sock *unix_get_socket(struct file *filp); 17 struct sock *unix_peer_get(struct sock *sk); 18 19 #define UNIX_HASH_SIZE 256 20 #define UNIX_HASH_BITS 8 21 22 extern unsigned int unix_tot_inflight; 23 extern spinlock_t unix_table_lock; 24 extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE]; 25 26 struct unix_address { 27 refcount_t refcnt; 28 int len; 29 unsigned int hash; 30 struct sockaddr_un name[]; 31 }; 32 33 struct unix_skb_parms { 34 struct pid *pid; /* Skb credentials */ 35 kuid_t uid; 36 kgid_t gid; 37 struct scm_fp_list *fp; /* Passed files */ 38 #ifdef CONFIG_SECURITY_NETWORK 39 u32 secid; /* Security ID */ 40 #endif 41 u32 consumed; 42 } __randomize_layout; 43 44 struct scm_stat { 45 atomic_t nr_fds; 46 }; 47 48 #define UNIXCB(skb) (*(struct unix_skb_parms *)&((skb)->cb)) 49 50 #define unix_state_lock(s) spin_lock(&unix_sk(s)->lock) 51 #define unix_state_unlock(s) spin_unlock(&unix_sk(s)->lock) 52 #define unix_state_lock_nested(s) \ 53 spin_lock_nested(&unix_sk(s)->lock, \ 54 SINGLE_DEPTH_NESTING) 55 56 /* The AF_UNIX socket */ 57 struct unix_sock { 58 /* WARNING: sk has to be the first member */ 59 struct sock sk; 60 struct unix_address *addr; 61 struct path path; 62 struct mutex iolock, bindlock; 63 struct sock *peer; 64 struct list_head link; 65 atomic_long_t inflight; 66 spinlock_t lock; 67 unsigned long gc_flags; 68 #define UNIX_GC_CANDIDATE 0 69 #define UNIX_GC_MAYBE_CYCLE 1 70 struct socket_wq peer_wq; 71 wait_queue_entry_t peer_wake; 72 struct scm_stat scm_stat; 73 }; 74 unix_sk(const struct sock * sk)75static inline struct unix_sock *unix_sk(const struct sock *sk) 76 { 77 return (struct unix_sock *)sk; 78 } 79 80 #define peer_wait peer_wq.wait 81 82 long unix_inq_len(struct sock *sk); 83 long unix_outq_len(struct sock *sk); 84 85 #ifdef CONFIG_SYSCTL 86 int unix_sysctl_register(struct net *net); 87 void unix_sysctl_unregister(struct net *net); 88 #else unix_sysctl_register(struct net * net)89static inline int unix_sysctl_register(struct net *net) { return 0; } unix_sysctl_unregister(struct net * net)90static inline void unix_sysctl_unregister(struct net *net) {} 91 #endif 92 #endif 93
