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