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 unsigned int unix_tot_inflight; 21 void unix_add_edges(struct scm_fp_list *fpl, struct unix_sock *receiver); 22 void unix_del_edges(struct scm_fp_list *fpl); 23 void unix_update_edges(struct unix_sock *receiver); 24 int unix_prepare_fpl(struct scm_fp_list *fpl); 25 void unix_destroy_fpl(struct scm_fp_list *fpl); 26 void unix_gc(void); 27 void wait_for_unix_gc(struct scm_fp_list *fpl); 28 29 struct unix_vertex { 30 struct list_head edges; 31 struct list_head entry; 32 struct list_head scc_entry; 33 unsigned long out_degree; 34 unsigned long index; 35 unsigned long scc_index; 36 }; 37 38 struct unix_edge { 39 struct unix_sock *predecessor; 40 struct unix_sock *successor; 41 struct list_head vertex_entry; 42 struct list_head stack_entry; 43 }; 44 45 struct sock *unix_peer_get(struct sock *sk); 46 47 #define UNIX_HASH_MOD (256 - 1) 48 #define UNIX_HASH_SIZE (256 * 2) 49 #define UNIX_HASH_BITS 8 50 51 struct unix_address { 52 refcount_t refcnt; 53 int len; 54 struct sockaddr_un name[]; 55 }; 56 57 struct unix_skb_parms { 58 struct pid *pid; /* Skb credentials */ 59 kuid_t uid; 60 kgid_t gid; 61 struct scm_fp_list *fp; /* Passed files */ 62 #ifdef CONFIG_SECURITY_NETWORK 63 u32 secid; /* Security ID */ 64 #endif 65 u32 consumed; 66 } __randomize_layout; 67 68 struct scm_stat { 69 atomic_t nr_fds; 70 unsigned long nr_unix_fds; 71 }; 72 73 #define UNIXCB(skb) (*(struct unix_skb_parms *)&((skb)->cb)) 74 75 /* The AF_UNIX socket */ 76 struct unix_sock { 77 /* WARNING: sk has to be the first member */ 78 struct sock sk; 79 struct unix_address *addr; 80 struct path path; 81 struct mutex iolock, bindlock; 82 struct sock *peer; 83 struct sock *listener; 84 struct unix_vertex *vertex; 85 spinlock_t lock; 86 struct socket_wq peer_wq; 87 wait_queue_entry_t peer_wake; 88 struct scm_stat scm_stat; 89 #if IS_ENABLED(CONFIG_AF_UNIX_OOB) 90 struct sk_buff *oob_skb; 91 #endif 92 }; 93 94 #define unix_sk(ptr) container_of_const(ptr, struct unix_sock, sk) 95 #define unix_peer(sk) (unix_sk(sk)->peer) 96 97 #define unix_state_lock(s) spin_lock(&unix_sk(s)->lock) 98 #define unix_state_unlock(s) spin_unlock(&unix_sk(s)->lock) 99 enum unix_socket_lock_class { 100 U_LOCK_NORMAL, 101 U_LOCK_SECOND, /* for double locking, see unix_state_double_lock(). */ 102 U_LOCK_DIAG, /* used while dumping icons, see sk_diag_dump_icons(). */ 103 U_LOCK_GC_LISTENER, /* used for listening socket while determining gc 104 * candidates to close a small race window. 105 */ 106 }; 107 108 static inline void unix_state_lock_nested(struct sock *sk, 109 enum unix_socket_lock_class subclass) 110 { 111 spin_lock_nested(&unix_sk(sk)->lock, subclass); 112 } 113 114 #define peer_wait peer_wq.wait 115 116 long unix_inq_len(struct sock *sk); 117 long unix_outq_len(struct sock *sk); 118 119 int __unix_dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t size, 120 int flags); 121 int __unix_stream_recvmsg(struct sock *sk, struct msghdr *msg, size_t size, 122 int flags); 123 #ifdef CONFIG_SYSCTL 124 int unix_sysctl_register(struct net *net); 125 void unix_sysctl_unregister(struct net *net); 126 #else 127 static inline int unix_sysctl_register(struct net *net) { return 0; } 128 static inline void unix_sysctl_unregister(struct net *net) {} 129 #endif 130 131 #ifdef CONFIG_BPF_SYSCALL 132 extern struct proto unix_dgram_proto; 133 extern struct proto unix_stream_proto; 134 135 int unix_dgram_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore); 136 int unix_stream_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore); 137 void __init unix_bpf_build_proto(void); 138 #else 139 static inline void __init unix_bpf_build_proto(void) 140 {} 141 #endif 142 #endif 143