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 void unix_inflight(struct user_struct *user, struct file *fp); 21 void unix_notinflight(struct user_struct *user, struct file *fp); 22 void unix_destruct_scm(struct sk_buff *skb); 23 void io_uring_destruct_scm(struct sk_buff *skb); 24 void unix_gc(void); 25 void wait_for_unix_gc(struct scm_fp_list *fpl); 26 struct sock *unix_peer_get(struct sock *sk); 27 28 #define UNIX_HASH_MOD (256 - 1) 29 #define UNIX_HASH_SIZE (256 * 2) 30 #define UNIX_HASH_BITS 8 31 32 extern unsigned int unix_tot_inflight; 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 #define unix_state_lock(s) spin_lock(&unix_sk(s)->lock) 58 #define unix_state_unlock(s) spin_unlock(&unix_sk(s)->lock) 59 #define unix_state_lock_nested(s) \ 60 spin_lock_nested(&unix_sk(s)->lock, \ 61 SINGLE_DEPTH_NESTING) 62 63 /* The AF_UNIX socket */ 64 struct unix_sock { 65 /* WARNING: sk has to be the first member */ 66 struct sock sk; 67 struct unix_address *addr; 68 struct path path; 69 struct mutex iolock, bindlock; 70 struct sock *peer; 71 struct list_head link; 72 unsigned long inflight; 73 spinlock_t lock; 74 unsigned long gc_flags; 75 #define UNIX_GC_CANDIDATE 0 76 #define UNIX_GC_MAYBE_CYCLE 1 77 struct socket_wq peer_wq; 78 wait_queue_entry_t peer_wake; 79 struct scm_stat scm_stat; 80 #if IS_ENABLED(CONFIG_AF_UNIX_OOB) 81 struct sk_buff *oob_skb; 82 #endif 83 }; 84 85 #define unix_sk(ptr) container_of_const(ptr, struct unix_sock, sk) 86 #define unix_peer(sk) (unix_sk(sk)->peer) 87 88 #define peer_wait peer_wq.wait 89 90 long unix_inq_len(struct sock *sk); 91 long unix_outq_len(struct sock *sk); 92 93 int __unix_dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t size, 94 int flags); 95 int __unix_stream_recvmsg(struct sock *sk, struct msghdr *msg, size_t size, 96 int flags); 97 #ifdef CONFIG_SYSCTL 98 int unix_sysctl_register(struct net *net); 99 void unix_sysctl_unregister(struct net *net); 100 #else 101 static inline int unix_sysctl_register(struct net *net) { return 0; } 102 static inline void unix_sysctl_unregister(struct net *net) {} 103 #endif 104 105 #ifdef CONFIG_BPF_SYSCALL 106 extern struct proto unix_dgram_proto; 107 extern struct proto unix_stream_proto; 108 109 int unix_dgram_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore); 110 int unix_stream_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore); 111 void __init unix_bpf_build_proto(void); 112 #else 113 static inline void __init unix_bpf_build_proto(void) 114 {} 115 #endif 116 #endif 117