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 io_uring_destruct_scm(struct sk_buff *skb); 15 void unix_gc(void); 16 void wait_for_unix_gc(void); 17 struct sock *unix_get_socket(struct file *filp); 18 struct 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 24 extern unsigned int unix_tot_inflight; 25 26 struct unix_address { 27 refcount_t refcnt; 28 int len; 29 struct sockaddr_un name[]; 30 }; 31 32 struct 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 43 struct scm_stat { 44 atomic_t nr_fds; 45 }; 46 47 #define UNIXCB(skb) (*(struct unix_skb_parms *)&((skb)->cb)) 48 49 #define unix_state_lock(s) spin_lock(&unix_sk(s)->lock) 50 #define unix_state_unlock(s) spin_unlock(&unix_sk(s)->lock) 51 #define unix_state_lock_nested(s) \ 52 spin_lock_nested(&unix_sk(s)->lock, \ 53 SINGLE_DEPTH_NESTING) 54 55 /* The AF_UNIX socket */ 56 struct unix_sock { 57 /* WARNING: sk has to be the first member */ 58 struct sock sk; 59 struct unix_address *addr; 60 struct path path; 61 struct mutex iolock, bindlock; 62 struct sock *peer; 63 struct list_head link; 64 atomic_long_t inflight; 65 spinlock_t lock; 66 unsigned long gc_flags; 67 #define UNIX_GC_CANDIDATE 0 68 #define UNIX_GC_MAYBE_CYCLE 1 69 struct socket_wq peer_wq; 70 wait_queue_entry_t peer_wake; 71 struct scm_stat scm_stat; 72 #if IS_ENABLED(CONFIG_AF_UNIX_OOB) 73 struct sk_buff *oob_skb; 74 #endif 75 }; 76 77 #define unix_sk(ptr) container_of_const(ptr, struct unix_sock, sk) 78 79 #define peer_wait peer_wq.wait 80 81 long unix_inq_len(struct sock *sk); 82 long unix_outq_len(struct sock *sk); 83 84 int __unix_dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t size, 85 int flags); 86 int __unix_stream_recvmsg(struct sock *sk, struct msghdr *msg, size_t size, 87 int flags); 88 #ifdef CONFIG_SYSCTL 89 int unix_sysctl_register(struct net *net); 90 void unix_sysctl_unregister(struct net *net); 91 #else 92 static inline int unix_sysctl_register(struct net *net) { return 0; } 93 static inline void unix_sysctl_unregister(struct net *net) {} 94 #endif 95 96 #ifdef CONFIG_BPF_SYSCALL 97 extern struct proto unix_dgram_proto; 98 extern struct proto unix_stream_proto; 99 100 int unix_dgram_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore); 101 int unix_stream_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore); 102 void __init unix_bpf_build_proto(void); 103 #else 104 static inline void __init unix_bpf_build_proto(void) 105 {} 106 #endif 107 #endif 108