1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_SOCKET_H
3#define _LINUX_SOCKET_H
4
5
6#include <asm/socket.h> /* arch-dependent defines */
7#include <linux/sockios.h> /* the SIOCxxx I/O controls */
8#include <linux/uio.h> /* iovec support */
9#include <linux/types.h> /* pid_t */
10#include <linux/compiler.h> /* __user */
11#include <uapi/linux/socket.h>
12
13struct pid;
14struct cred;
15
16#define __sockaddr_check_size(size) \
17 BUILD_BUG_ON(((size) > sizeof(struct __kernel_sockaddr_storage)))
18
19#ifdef CONFIG_PROC_FS
20struct seq_file;
21extern void socket_seq_show(struct seq_file *seq);
22#endif
23
24typedef __kernel_sa_family_t sa_family_t;
25
26/*
27 * 1003.1g requires sa_family_t and that sa_data is char.
28 */
29
30struct sockaddr {
31 sa_family_t sa_family; /* address family, AF_xxx */
32 char sa_data[14]; /* 14 bytes of protocol address */
33};
34
35struct linger {
36 int l_onoff; /* Linger active */
37 int l_linger; /* How long to linger for */
38};
39
40#define sockaddr_storage __kernel_sockaddr_storage
41
42/*
43 * As we do 4.4BSD message passing we use a 4.4BSD message passing
44 * system, not 4.3. Thus msg_accrights(len) are now missing. They
45 * belong in an obscure libc emulation or the bin.
46 */
47
48struct msghdr {
49 void *msg_name; /* ptr to socket address structure */
50 int msg_namelen; /* size of socket address structure */
51 struct iov_iter msg_iter; /* data */
52 void *msg_control; /* ancillary data */
53 __kernel_size_t msg_controllen; /* ancillary data buffer length */
54 unsigned int msg_flags; /* flags on received message */
55 struct kiocb *msg_iocb; /* ptr to iocb for async requests */
56};
57
58struct user_msghdr {
59 void __user *msg_name; /* ptr to socket address structure */
60 int msg_namelen; /* size of socket address structure */
61 struct iovec __user *msg_iov; /* scatter/gather array */
62 __kernel_size_t msg_iovlen; /* # elements in msg_iov */
63 void __user *msg_control; /* ancillary data */
64 __kernel_size_t msg_controllen; /* ancillary data buffer length */
65 unsigned int msg_flags; /* flags on received message */
66};
67
68/* For recvmmsg/sendmmsg */
69struct mmsghdr {
70 struct user_msghdr msg_hdr;
71 unsigned int msg_len;
72};
73
74/*
75 * POSIX 1003.1g - ancillary data object information
76 * Ancillary data consits of a sequence of pairs of
77 * (cmsghdr, cmsg_data[])
78 */
79
80struct cmsghdr {
81 __kernel_size_t cmsg_len; /* data byte count, including hdr */
82 int cmsg_level; /* originating protocol */
83 int cmsg_type; /* protocol-specific type */
84};
85
86/*
87 * Ancillary data object information MACROS
88 * Table 5-14 of POSIX 1003.1g
89 */
90
91#define __CMSG_NXTHDR(ctl, len, cmsg) __cmsg_nxthdr((ctl),(len),(cmsg))
92#define CMSG_NXTHDR(mhdr, cmsg) cmsg_nxthdr((mhdr), (cmsg))
93
94#define CMSG_ALIGN(len) ( ((len)+sizeof(long)-1) & ~(sizeof(long)-1) )
95
96#define CMSG_DATA(cmsg) ((void *)((char *)(cmsg) + sizeof(struct cmsghdr)))
97#define CMSG_SPACE(len) (sizeof(struct cmsghdr) + CMSG_ALIGN(len))
98#define CMSG_LEN(len) (sizeof(struct cmsghdr) + (len))
99
100#define __CMSG_FIRSTHDR(ctl,len) ((len) >= sizeof(struct cmsghdr) ? \
101 (struct cmsghdr *)(ctl) : \
102 (struct cmsghdr *)NULL)
103#define CMSG_FIRSTHDR(msg) __CMSG_FIRSTHDR((msg)->msg_control, (msg)->msg_controllen)
104#define CMSG_OK(mhdr, cmsg) ((cmsg)->cmsg_len >= sizeof(struct cmsghdr) && \
105 (cmsg)->cmsg_len <= (unsigned long) \
106 ((mhdr)->msg_controllen - \
107 ((char *)(cmsg) - (char *)(mhdr)->msg_control)))
108#define for_each_cmsghdr(cmsg, msg) \
109 for (cmsg = CMSG_FIRSTHDR(msg); \
110 cmsg; \
111 cmsg = CMSG_NXTHDR(msg, cmsg))
112
113/*
114 * Get the next cmsg header
115 *
116 * PLEASE, do not touch this function. If you think, that it is
117 * incorrect, grep kernel sources and think about consequences
118 * before trying to improve it.
119 *
120 * Now it always returns valid, not truncated ancillary object
121 * HEADER. But caller still MUST check, that cmsg->cmsg_len is
122 * inside range, given by msg->msg_controllen before using
123 * ancillary object DATA. --ANK (980731)
124 */
125
126static inline struct cmsghdr * __cmsg_nxthdr(void *__ctl, __kernel_size_t __size,
127 struct cmsghdr *__cmsg)
128{
129 struct cmsghdr * __ptr;
130
131 __ptr = (struct cmsghdr*)(((unsigned char *) __cmsg) + CMSG_ALIGN(__cmsg->cmsg_len));
132 if ((unsigned long)((char*)(__ptr+1) - (char *) __ctl) > __size)
133 return (struct cmsghdr *)0;
134
135 return __ptr;
136}
137
138static inline struct cmsghdr * cmsg_nxthdr (struct msghdr *__msg, struct cmsghdr *__cmsg)
139{
140 return __cmsg_nxthdr(__msg->msg_control, __msg->msg_controllen, __cmsg);
141}
142
143static inline size_t msg_data_left(struct msghdr *msg)
144{
145 return iov_iter_count(&msg->msg_iter);
146}
147
148/* "Socket"-level control message types: */
149
150#define SCM_RIGHTS 0x01 /* rw: access rights (array of int) */
151#define SCM_CREDENTIALS 0x02 /* rw: struct ucred */
152#define SCM_SECURITY 0x03 /* rw: security label */
153
154struct ucred {
155 __u32 pid;
156 __u32 uid;
157 __u32 gid;
158};
159
160/* Supported address families. */
161#define AF_UNSPEC 0
162#define AF_UNIX 1 /* Unix domain sockets */
163#define AF_LOCAL 1 /* POSIX name for AF_UNIX */
164#define AF_INET 2 /* Internet IP Protocol */
165#define AF_AX25 3 /* Amateur Radio AX.25 */
166#define AF_IPX 4 /* Novell IPX */
167#define AF_APPLETALK 5 /* AppleTalk DDP */
168#define AF_NETROM 6 /* Amateur Radio NET/ROM */
169#define AF_BRIDGE 7 /* Multiprotocol bridge */
170#define AF_ATMPVC 8 /* ATM PVCs */
171#define AF_X25 9 /* Reserved for X.25 project */
172#define AF_INET6 10 /* IP version 6 */
173#define AF_ROSE 11 /* Amateur Radio X.25 PLP */
174#define AF_DECnet 12 /* Reserved for DECnet project */
175#define AF_NETBEUI 13 /* Reserved for 802.2LLC project*/
176#define AF_SECURITY 14 /* Security callback pseudo AF */
177#define AF_KEY 15 /* PF_KEY key management API */
178#define AF_NETLINK 16
179#define AF_ROUTE AF_NETLINK /* Alias to emulate 4.4BSD */
180#define AF_PACKET 17 /* Packet family */
181#define AF_ASH 18 /* Ash */
182#define AF_ECONET 19 /* Acorn Econet */
183#define AF_ATMSVC 20 /* ATM SVCs */
184#define AF_RDS 21 /* RDS sockets */
185#define AF_SNA 22 /* Linux SNA Project (nutters!) */
186#define AF_IRDA 23 /* IRDA sockets */
187#define AF_PPPOX 24 /* PPPoX sockets */
188#define AF_WANPIPE 25 /* Wanpipe API Sockets */
189#define AF_LLC 26 /* Linux LLC */
190#define AF_IB 27 /* Native InfiniBand address */
191#define AF_MPLS 28 /* MPLS */
192#define AF_CAN 29 /* Controller Area Network */
193#define AF_TIPC 30 /* TIPC sockets */
194#define AF_BLUETOOTH 31 /* Bluetooth sockets */
195#define AF_IUCV 32 /* IUCV sockets */
196#define AF_RXRPC 33 /* RxRPC sockets */
197#define AF_ISDN 34 /* mISDN sockets */
198#define AF_PHONET 35 /* Phonet sockets */
199#define AF_IEEE802154 36 /* IEEE802154 sockets */
200#define AF_CAIF 37 /* CAIF sockets */
201#define AF_ALG 38 /* Algorithm sockets */
202#define AF_NFC 39 /* NFC sockets */
203#define AF_VSOCK 40 /* vSockets */
204#define AF_KCM 41 /* Kernel Connection Multiplexor*/
205#define AF_QIPCRTR 42 /* Qualcomm IPC Router */
206#define AF_SMC 43 /* smc sockets: reserve number for
207 * PF_SMC protocol family that
208 * reuses AF_INET address family
209 */
210#define AF_XDP 44 /* XDP sockets */
211
212#define AF_MAX 45 /* For now.. */
213
214/* Protocol families, same as address families. */
215#define PF_UNSPEC AF_UNSPEC
216#define PF_UNIX AF_UNIX
217#define PF_LOCAL AF_LOCAL
218#define PF_INET AF_INET
219#define PF_AX25 AF_AX25
220#define PF_IPX AF_IPX
221#define PF_APPLETALK AF_APPLETALK
222#define PF_NETROM AF_NETROM
223#define PF_BRIDGE AF_BRIDGE
224#define PF_ATMPVC AF_ATMPVC
225#define PF_X25 AF_X25
226#define PF_INET6 AF_INET6
227#define PF_ROSE AF_ROSE
228#define PF_DECnet AF_DECnet
229#define PF_NETBEUI AF_NETBEUI
230#define PF_SECURITY AF_SECURITY
231#define PF_KEY AF_KEY
232#define PF_NETLINK AF_NETLINK
233#define PF_ROUTE AF_ROUTE
234#define PF_PACKET AF_PACKET
235#define PF_ASH AF_ASH
236#define PF_ECONET AF_ECONET
237#define PF_ATMSVC AF_ATMSVC
238#define PF_RDS AF_RDS
239#define PF_SNA AF_SNA
240#define PF_IRDA AF_IRDA
241#define PF_PPPOX AF_PPPOX
242#define PF_WANPIPE AF_WANPIPE
243#define PF_LLC AF_LLC
244#define PF_IB AF_IB
245#define PF_MPLS AF_MPLS
246#define PF_CAN AF_CAN
247#define PF_TIPC AF_TIPC
248#define PF_BLUETOOTH AF_BLUETOOTH
249#define PF_IUCV AF_IUCV
250#define PF_RXRPC AF_RXRPC
251#define PF_ISDN AF_ISDN
252#define PF_PHONET AF_PHONET
253#define PF_IEEE802154 AF_IEEE802154
254#define PF_CAIF AF_CAIF
255#define PF_ALG AF_ALG
256#define PF_NFC AF_NFC
257#define PF_VSOCK AF_VSOCK
258#define PF_KCM AF_KCM
259#define PF_QIPCRTR AF_QIPCRTR
260#define PF_SMC AF_SMC
261#define PF_XDP AF_XDP
262#define PF_MAX AF_MAX
263
264/* Maximum queue length specifiable by listen. */
265#define SOMAXCONN 128
266
267/* Flags we can use with send/ and recv.
268 Added those for 1003.1g not all are supported yet
269 */
270
271#define MSG_OOB 1
272#define MSG_PEEK 2
273#define MSG_DONTROUTE 4
274#define MSG_TRYHARD 4 /* Synonym for MSG_DONTROUTE for DECnet */
275#define MSG_CTRUNC 8
276#define MSG_PROBE 0x10 /* Do not send. Only probe path f.e. for MTU */
277#define MSG_TRUNC 0x20
278#define MSG_DONTWAIT 0x40 /* Nonblocking io */
279#define MSG_EOR 0x80 /* End of record */
280#define MSG_WAITALL 0x100 /* Wait for a full request */
281#define MSG_FIN 0x200
282#define MSG_SYN 0x400
283#define MSG_CONFIRM 0x800 /* Confirm path validity */
284#define MSG_RST 0x1000
285#define MSG_ERRQUEUE 0x2000 /* Fetch message from error queue */
286#define MSG_NOSIGNAL 0x4000 /* Do not generate SIGPIPE */
287#define MSG_MORE 0x8000 /* Sender will send more */
288#define MSG_WAITFORONE 0x10000 /* recvmmsg(): block until 1+ packets avail */
289#define MSG_SENDPAGE_NOTLAST 0x20000 /* sendpage() internal : not the last page */
290#define MSG_BATCH 0x40000 /* sendmmsg(): more messages coming */
291#define MSG_EOF MSG_FIN
292#define MSG_NO_SHARED_FRAGS 0x80000 /* sendpage() internal : page frags are not shared */
293
294#define MSG_ZEROCOPY 0x4000000 /* Use user data in kernel path */
295#define MSG_FASTOPEN 0x20000000 /* Send data in TCP SYN */
296#define MSG_CMSG_CLOEXEC 0x40000000 /* Set close_on_exec for file
297 descriptor received through
298 SCM_RIGHTS */
299#if defined(CONFIG_COMPAT)
300#define MSG_CMSG_COMPAT 0x80000000 /* This message needs 32 bit fixups */
301#else
302#define MSG_CMSG_COMPAT 0 /* We never have 32 bit fixups */
303#endif
304
305
306/* Setsockoptions(2) level. Thanks to BSD these must match IPPROTO_xxx */
307#define SOL_IP 0
308/* #define SOL_ICMP 1 No-no-no! Due to Linux :-) we cannot use SOL_ICMP=1 */
309#define SOL_TCP 6
310#define SOL_UDP 17
311#define SOL_IPV6 41
312#define SOL_ICMPV6 58
313#define SOL_SCTP 132
314#define SOL_UDPLITE 136 /* UDP-Lite (RFC 3828) */
315#define SOL_RAW 255
316#define SOL_IPX 256
317#define SOL_AX25 257
318#define SOL_ATALK 258
319#define SOL_NETROM 259
320#define SOL_ROSE 260
321#define SOL_DECNET 261
322#define SOL_X25 262
323#define SOL_PACKET 263
324#define SOL_ATM 264 /* ATM layer (cell level) */
325#define SOL_AAL 265 /* ATM Adaption Layer (packet level) */
326#define SOL_IRDA 266
327#define SOL_NETBEUI 267
328#define SOL_LLC 268
329#define SOL_DCCP 269
330#define SOL_NETLINK 270
331#define SOL_TIPC 271
332#define SOL_RXRPC 272
333#define SOL_PPPOL2TP 273
334#define SOL_BLUETOOTH 274
335#define SOL_PNPIPE 275
336#define SOL_RDS 276
337#define SOL_IUCV 277
338#define SOL_CAIF 278
339#define SOL_ALG 279
340#define SOL_NFC 280
341#define SOL_KCM 281
342#define SOL_TLS 282
343#define SOL_XDP 283
344
345/* IPX options */
346#define IPX_TYPE 1
347
348extern int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr);
349extern int put_cmsg(struct msghdr*, int level, int type, int len, void *data);
350
351struct timespec;
352
353/* The __sys_...msg variants allow MSG_CMSG_COMPAT iff
354 * forbid_cmsg_compat==false
355 */
356extern long __sys_recvmsg(int fd, struct user_msghdr __user *msg,
357 unsigned int flags, bool forbid_cmsg_compat);
358extern long __sys_sendmsg(int fd, struct user_msghdr __user *msg,
359 unsigned int flags, bool forbid_cmsg_compat);
360extern int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
361 unsigned int flags, struct timespec *timeout);
362extern int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg,
363 unsigned int vlen, unsigned int flags,
364 bool forbid_cmsg_compat);
365
366/* helpers which do the actual work for syscalls */
367extern int __sys_recvfrom(int fd, void __user *ubuf, size_t size,
368 unsigned int flags, struct sockaddr __user *addr,
369 int __user *addr_len);
370extern int __sys_sendto(int fd, void __user *buff, size_t len,
371 unsigned int flags, struct sockaddr __user *addr,
372 int addr_len);
373extern int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr,
374 int __user *upeer_addrlen, int flags);
375extern int __sys_socket(int family, int type, int protocol);
376extern int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen);
377extern int __sys_connect(int fd, struct sockaddr __user *uservaddr,
378 int addrlen);
379extern int __sys_listen(int fd, int backlog);
380extern int __sys_getsockname(int fd, struct sockaddr __user *usockaddr,
381 int __user *usockaddr_len);
382extern int __sys_getpeername(int fd, struct sockaddr __user *usockaddr,
383 int __user *usockaddr_len);
384extern int __sys_socketpair(int family, int type, int protocol,
385 int __user *usockvec);
386extern int __sys_shutdown(int fd, int how);
387
388extern struct ns_common *get_net_ns(struct ns_common *ns);
389#endif /* _LINUX_SOCKET_H */
390