1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */
21da177e4SLinus Torvalds #ifndef __LINUX_NET_AFUNIX_H
31da177e4SLinus Torvalds #define __LINUX_NET_AFUNIX_H
420380731SArnaldo Carvalho de Melo
520380731SArnaldo Carvalho de Melo #include <linux/socket.h>
620380731SArnaldo Carvalho de Melo #include <linux/un.h>
757b47a53SIngo Molnar #include <linux/mutex.h>
88c9814b9SReshetova, Elena #include <linux/refcount.h>
920380731SArnaldo Carvalho de Melo #include <net/sock.h>
1020380731SArnaldo Carvalho de Melo
11d9f21b36SKuniyuki Iwashima #if IS_ENABLED(CONFIG_UNIX)
12d9f21b36SKuniyuki Iwashima struct unix_sock *unix_get_socket(struct file *filp);
13d9f21b36SKuniyuki Iwashima #else
unix_get_socket(struct file * filp)14d9f21b36SKuniyuki Iwashima static inline struct unix_sock *unix_get_socket(struct file *filp)
15d9f21b36SKuniyuki Iwashima {
16d9f21b36SKuniyuki Iwashima return NULL;
17d9f21b36SKuniyuki Iwashima }
18d9f21b36SKuniyuki Iwashima #endif
19d9f21b36SKuniyuki Iwashima
2099a7a5b9SKuniyuki Iwashima extern unsigned int unix_tot_inflight;
2142f298c0SKuniyuki Iwashima void unix_add_edges(struct scm_fp_list *fpl, struct unix_sock *receiver);
2242f298c0SKuniyuki Iwashima void unix_del_edges(struct scm_fp_list *fpl);
23dcf70df2SKuniyuki Iwashima void unix_update_edges(struct unix_sock *receiver);
241fbfdfaaSKuniyuki Iwashima int unix_prepare_fpl(struct scm_fp_list *fpl);
251fbfdfaaSKuniyuki Iwashima void unix_destroy_fpl(struct scm_fp_list *fpl);
26b60a8280SJoe Perches void unix_gc(void);
27d9f21b36SKuniyuki Iwashima void wait_for_unix_gc(struct scm_fp_list *fpl);
2899a7a5b9SKuniyuki Iwashima
291fbfdfaaSKuniyuki Iwashima struct unix_vertex {
301fbfdfaaSKuniyuki Iwashima struct list_head edges;
311fbfdfaaSKuniyuki Iwashima struct list_head entry;
323484f063SKuniyuki Iwashima struct list_head scc_entry;
331fbfdfaaSKuniyuki Iwashima unsigned long out_degree;
346ba76fd2SKuniyuki Iwashima unsigned long index;
35bfdb0128SKuniyuki Iwashima unsigned long scc_index;
361fbfdfaaSKuniyuki Iwashima };
371fbfdfaaSKuniyuki Iwashima
3829b64e35SKuniyuki Iwashima struct unix_edge {
3929b64e35SKuniyuki Iwashima struct unix_sock *predecessor;
4029b64e35SKuniyuki Iwashima struct unix_sock *successor;
4129b64e35SKuniyuki Iwashima struct list_head vertex_entry;
426ba76fd2SKuniyuki Iwashima struct list_head stack_entry;
4329b64e35SKuniyuki Iwashima };
4429b64e35SKuniyuki Iwashima
45c4147beaSBo YU struct sock *unix_peer_get(struct sock *sk);
461da177e4SLinus Torvalds
47f302d180SKuniyuki Iwashima #define UNIX_HASH_MOD (256 - 1)
48f302d180SKuniyuki Iwashima #define UNIX_HASH_SIZE (256 * 2)
497123aaa3SEric Dumazet #define UNIX_HASH_BITS 8
501da177e4SLinus Torvalds
511da177e4SLinus Torvalds struct unix_address {
528c9814b9SReshetova, Elena refcount_t refcnt;
531da177e4SLinus Torvalds int len;
54e9553762SGustavo A. R. Silva struct sockaddr_un name[];
551da177e4SLinus Torvalds };
561da177e4SLinus Torvalds
571da177e4SLinus Torvalds struct unix_skb_parms {
587361c36cSEric W. Biederman struct pid *pid; /* Skb credentials */
596b0ee8c0SEric W. Biederman kuid_t uid;
606b0ee8c0SEric W. Biederman kgid_t gid;
611da177e4SLinus Torvalds struct scm_fp_list *fp; /* Passed files */
62877ce7c1SCatherine Zhang #ifdef CONFIG_SECURITY_NETWORK
63dc49c1f9SCatherine Zhang u32 secid; /* Security ID */
64877ce7c1SCatherine Zhang #endif
65e370a723SEric Dumazet u32 consumed;
663859a271SKees Cook } __randomize_layout;
671da177e4SLinus Torvalds
683c32da19SKirill Tkhai struct scm_stat {
697782040bSPaolo Abeni atomic_t nr_fds;
70*fd863448SKuniyuki Iwashima unsigned long nr_unix_fds;
713c32da19SKirill Tkhai };
723c32da19SKirill Tkhai
731da177e4SLinus Torvalds #define UNIXCB(skb) (*(struct unix_skb_parms *)&((skb)->cb))
741da177e4SLinus Torvalds
751da177e4SLinus Torvalds /* The AF_UNIX socket */
761da177e4SLinus Torvalds struct unix_sock {
771da177e4SLinus Torvalds /* WARNING: sk has to be the first member */
781da177e4SLinus Torvalds struct sock sk;
791da177e4SLinus Torvalds struct unix_address *addr;
8040ffe67dSAl Viro struct path path;
816e1ce3c3SLinus Torvalds struct mutex iolock, bindlock;
821da177e4SLinus Torvalds struct sock *peer;
83aed6ecefSKuniyuki Iwashima struct sock *listener;
841fbfdfaaSKuniyuki Iwashima struct unix_vertex *vertex;
85fd19f329SBenjamin LaHaise spinlock_t lock;
8643815482SEric Dumazet struct socket_wq peer_wq;
87ac6424b9SIngo Molnar wait_queue_entry_t peer_wake;
883c32da19SKirill Tkhai struct scm_stat scm_stat;
89314001f0SRao Shoaib #if IS_ENABLED(CONFIG_AF_UNIX_OOB)
90314001f0SRao Shoaib struct sk_buff *oob_skb;
91314001f0SRao Shoaib #endif
921da177e4SLinus Torvalds };
934613012dSAaron Conole
94b064ba9cSEric Dumazet #define unix_sk(ptr) container_of_const(ptr, struct unix_sock, sk)
958866730aSJohn Fastabend #define unix_peer(sk) (unix_sk(sk)->peer)
9620380731SArnaldo Carvalho de Melo
974d322dceSEric Dumazet #define unix_state_lock(s) spin_lock(&unix_sk(s)->lock)
984d322dceSEric Dumazet #define unix_state_unlock(s) spin_unlock(&unix_sk(s)->lock)
994d322dceSEric Dumazet enum unix_socket_lock_class {
1004d322dceSEric Dumazet U_LOCK_NORMAL,
1014d322dceSEric Dumazet U_LOCK_SECOND, /* for double locking, see unix_state_double_lock(). */
1024d322dceSEric Dumazet U_LOCK_DIAG, /* used while dumping icons, see sk_diag_dump_icons(). */
1031971d13fSKuniyuki Iwashima U_LOCK_GC_LISTENER, /* used for listening socket while determining gc
1041971d13fSKuniyuki Iwashima * candidates to close a small race window.
1051971d13fSKuniyuki Iwashima */
1064d322dceSEric Dumazet };
1074d322dceSEric Dumazet
unix_state_lock_nested(struct sock * sk,enum unix_socket_lock_class subclass)1084d322dceSEric Dumazet static inline void unix_state_lock_nested(struct sock *sk,
1094d322dceSEric Dumazet enum unix_socket_lock_class subclass)
1104d322dceSEric Dumazet {
1114d322dceSEric Dumazet spin_lock_nested(&unix_sk(sk)->lock, subclass);
1124d322dceSEric Dumazet }
1134d322dceSEric Dumazet
11443815482SEric Dumazet #define peer_wait peer_wq.wait
11543815482SEric Dumazet
116885ee74dSPavel Emelyanov long unix_inq_len(struct sock *sk);
117885ee74dSPavel Emelyanov long unix_outq_len(struct sock *sk);
118885ee74dSPavel Emelyanov
1199825d866SCong Wang int __unix_dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
1209825d866SCong Wang int flags);
12194531cfcSJiang Wang int __unix_stream_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
12294531cfcSJiang Wang int flags);
12320380731SArnaldo Carvalho de Melo #ifdef CONFIG_SYSCTL
124b60a8280SJoe Perches int unix_sysctl_register(struct net *net);
125b60a8280SJoe Perches void unix_sysctl_unregister(struct net *net);
12620380731SArnaldo Carvalho de Melo #else
unix_sysctl_register(struct net * net)12797577e38SPavel Emelyanov static inline int unix_sysctl_register(struct net *net) { return 0; }
unix_sysctl_unregister(struct net * net)12897577e38SPavel Emelyanov static inline void unix_sysctl_unregister(struct net *net) {}
12920380731SArnaldo Carvalho de Melo #endif
130c6382918SCong Wang
131c6382918SCong Wang #ifdef CONFIG_BPF_SYSCALL
13294531cfcSJiang Wang extern struct proto unix_dgram_proto;
13394531cfcSJiang Wang extern struct proto unix_stream_proto;
134c6382918SCong Wang
13594531cfcSJiang Wang int unix_dgram_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
13694531cfcSJiang Wang int unix_stream_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
137c6382918SCong Wang void __init unix_bpf_build_proto(void);
138c6382918SCong Wang #else
unix_bpf_build_proto(void)139c6382918SCong Wang static inline void __init unix_bpf_build_proto(void)
140c6382918SCong Wang {}
141c6382918SCong Wang #endif
1421da177e4SLinus Torvalds #endif
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