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 spinlock_t unix_gc_lock; 21 extern unsigned int unix_tot_inflight; 22 void unix_add_edges(struct scm_fp_list *fpl, struct unix_sock *receiver); 23 void unix_del_edges(struct scm_fp_list *fpl); 24 void unix_update_edges(struct unix_sock *receiver); 25 int unix_prepare_fpl(struct scm_fp_list *fpl); 26 void unix_destroy_fpl(struct scm_fp_list *fpl); 27 void unix_gc(void); 28 void wait_for_unix_gc(struct scm_fp_list *fpl); 29 30 struct unix_vertex { 31 struct list_head edges; 32 struct list_head entry; 33 struct list_head scc_entry; 34 unsigned long out_degree; 35 unsigned long index; 36 unsigned long scc_index; 37 }; 38 39 struct unix_edge { 40 struct unix_sock *predecessor; 41 struct unix_sock *successor; 42 struct list_head vertex_entry; 43 struct list_head stack_entry; 44 }; 45 46 struct sock *unix_peer_get(struct sock *sk); 47 48 #define UNIX_HASH_MOD (256 - 1) 49 #define UNIX_HASH_SIZE (256 * 2) 50 #define UNIX_HASH_BITS 8 51 52 struct unix_address { 53 refcount_t refcnt; 54 int len; 55 struct sockaddr_un name[]; 56 }; 57 58 struct unix_skb_parms { 59 struct pid *pid; /* Skb credentials */ 60 kuid_t uid; 61 kgid_t gid; 62 struct scm_fp_list *fp; /* Passed files */ 63 #ifdef CONFIG_SECURITY_NETWORK 64 u32 secid; /* Security ID */ 65 #endif 66 u32 consumed; 67 } __randomize_layout; 68 69 struct scm_stat { 70 atomic_t nr_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 }; 104 105 static inline void unix_state_lock_nested(struct sock *sk, 106 enum unix_socket_lock_class subclass) 107 { 108 spin_lock_nested(&unix_sk(sk)->lock, subclass); 109 } 110 111 #define peer_wait peer_wq.wait 112 113 long unix_inq_len(struct sock *sk); 114 long unix_outq_len(struct sock *sk); 115 116 int __unix_dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t size, 117 int flags); 118 int __unix_stream_recvmsg(struct sock *sk, struct msghdr *msg, size_t size, 119 int flags); 120 #ifdef CONFIG_SYSCTL 121 int unix_sysctl_register(struct net *net); 122 void unix_sysctl_unregister(struct net *net); 123 #else 124 static inline int unix_sysctl_register(struct net *net) { return 0; } 125 static inline void unix_sysctl_unregister(struct net *net) {} 126 #endif 127 128 #ifdef CONFIG_BPF_SYSCALL 129 extern struct proto unix_dgram_proto; 130 extern struct proto unix_stream_proto; 131 132 int unix_dgram_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore); 133 int unix_stream_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore); 134 void __init unix_bpf_build_proto(void); 135 #else 136 static inline void __init unix_bpf_build_proto(void) 137 {} 138 #endif 139 #endif 140