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TOMOYO Linux Cross Reference
Linux/include/linux/socket.h

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  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 
 13 struct file;
 14 struct pid;
 15 struct cred;
 16 struct socket;
 17 struct sock;
 18 struct sk_buff;
 19 struct proto_accept_arg;
 20 
 21 #define __sockaddr_check_size(size)     \
 22         BUILD_BUG_ON(((size) > sizeof(struct __kernel_sockaddr_storage)))
 23 
 24 #ifdef CONFIG_PROC_FS
 25 struct seq_file;
 26 extern void socket_seq_show(struct seq_file *seq);
 27 #endif
 28 
 29 typedef __kernel_sa_family_t    sa_family_t;
 30 
 31 /*
 32  *      1003.1g requires sa_family_t and that sa_data is char.
 33  */
 34 
 35 struct sockaddr {
 36         sa_family_t     sa_family;      /* address family, AF_xxx       */
 37         union {
 38                 char sa_data_min[14];           /* Minimum 14 bytes of protocol address */
 39                 DECLARE_FLEX_ARRAY(char, sa_data);
 40         };
 41 };
 42 
 43 struct linger {
 44         int             l_onoff;        /* Linger active                */
 45         int             l_linger;       /* How long to linger for       */
 46 };
 47 
 48 #define sockaddr_storage __kernel_sockaddr_storage
 49 
 50 /*
 51  *      As we do 4.4BSD message passing we use a 4.4BSD message passing
 52  *      system, not 4.3. Thus msg_accrights(len) are now missing. They
 53  *      belong in an obscure libc emulation or the bin.
 54  */
 55 
 56 struct msghdr {
 57         void            *msg_name;      /* ptr to socket address structure */
 58         int             msg_namelen;    /* size of socket address structure */
 59 
 60         int             msg_inq;        /* output, data left in socket */
 61 
 62         struct iov_iter msg_iter;       /* data */
 63 
 64         /*
 65          * Ancillary data. msg_control_user is the user buffer used for the
 66          * recv* side when msg_control_is_user is set, msg_control is the kernel
 67          * buffer used for all other cases.
 68          */
 69         union {
 70                 void            *msg_control;
 71                 void __user     *msg_control_user;
 72         };
 73         bool            msg_control_is_user : 1;
 74         bool            msg_get_inq : 1;/* return INQ after receive */
 75         unsigned int    msg_flags;      /* flags on received message */
 76         __kernel_size_t msg_controllen; /* ancillary data buffer length */
 77         struct kiocb    *msg_iocb;      /* ptr to iocb for async requests */
 78         struct ubuf_info *msg_ubuf;
 79         int (*sg_from_iter)(struct sk_buff *skb,
 80                             struct iov_iter *from, size_t length);
 81 };
 82 
 83 struct user_msghdr {
 84         void            __user *msg_name;       /* ptr to socket address structure */
 85         int             msg_namelen;            /* size of socket address structure */
 86         struct iovec    __user *msg_iov;        /* scatter/gather array */
 87         __kernel_size_t msg_iovlen;             /* # elements in msg_iov */
 88         void            __user *msg_control;    /* ancillary data */
 89         __kernel_size_t msg_controllen;         /* ancillary data buffer length */
 90         unsigned int    msg_flags;              /* flags on received message */
 91 };
 92 
 93 /* For recvmmsg/sendmmsg */
 94 struct mmsghdr {
 95         struct user_msghdr  msg_hdr;
 96         unsigned int        msg_len;
 97 };
 98 
 99 /*
100  *      POSIX 1003.1g - ancillary data object information
101  *      Ancillary data consists of a sequence of pairs of
102  *      (cmsghdr, cmsg_data[])
103  */
104 
105 struct cmsghdr {
106         __kernel_size_t cmsg_len;       /* data byte count, including hdr */
107         int             cmsg_level;     /* originating protocol */
108         int             cmsg_type;      /* protocol-specific type */
109 };
110 
111 /*
112  *      Ancillary data object information MACROS
113  *      Table 5-14 of POSIX 1003.1g
114  */
115 
116 #define __CMSG_NXTHDR(ctl, len, cmsg) __cmsg_nxthdr((ctl),(len),(cmsg))
117 #define CMSG_NXTHDR(mhdr, cmsg) cmsg_nxthdr((mhdr), (cmsg))
118 
119 #define CMSG_ALIGN(len) ( ((len)+sizeof(long)-1) & ~(sizeof(long)-1) )
120 
121 #define CMSG_DATA(cmsg) \
122         ((void *)(cmsg) + sizeof(struct cmsghdr))
123 #define CMSG_USER_DATA(cmsg) \
124         ((void __user *)(cmsg) + sizeof(struct cmsghdr))
125 #define CMSG_SPACE(len) (sizeof(struct cmsghdr) + CMSG_ALIGN(len))
126 #define CMSG_LEN(len) (sizeof(struct cmsghdr) + (len))
127 
128 #define __CMSG_FIRSTHDR(ctl,len) ((len) >= sizeof(struct cmsghdr) ? \
129                                   (struct cmsghdr *)(ctl) : \
130                                   (struct cmsghdr *)NULL)
131 #define CMSG_FIRSTHDR(msg)      __CMSG_FIRSTHDR((msg)->msg_control, (msg)->msg_controllen)
132 #define CMSG_OK(mhdr, cmsg) ((cmsg)->cmsg_len >= sizeof(struct cmsghdr) && \
133                              (cmsg)->cmsg_len <= (unsigned long) \
134                              ((mhdr)->msg_controllen - \
135                               ((char *)(cmsg) - (char *)(mhdr)->msg_control)))
136 #define for_each_cmsghdr(cmsg, msg) \
137         for (cmsg = CMSG_FIRSTHDR(msg); \
138              cmsg; \
139              cmsg = CMSG_NXTHDR(msg, cmsg))
140 
141 /*
142  *      Get the next cmsg header
143  *
144  *      PLEASE, do not touch this function. If you think, that it is
145  *      incorrect, grep kernel sources and think about consequences
146  *      before trying to improve it.
147  *
148  *      Now it always returns valid, not truncated ancillary object
149  *      HEADER. But caller still MUST check, that cmsg->cmsg_len is
150  *      inside range, given by msg->msg_controllen before using
151  *      ancillary object DATA.                          --ANK (980731)
152  */
153 
154 static inline struct cmsghdr * __cmsg_nxthdr(void *__ctl, __kernel_size_t __size,
155                                                struct cmsghdr *__cmsg)
156 {
157         struct cmsghdr * __ptr;
158 
159         __ptr = (struct cmsghdr*)(((unsigned char *) __cmsg) +  CMSG_ALIGN(__cmsg->cmsg_len));
160         if ((unsigned long)((char*)(__ptr+1) - (char *) __ctl) > __size)
161                 return (struct cmsghdr *)0;
162 
163         return __ptr;
164 }
165 
166 static inline struct cmsghdr * cmsg_nxthdr (struct msghdr *__msg, struct cmsghdr *__cmsg)
167 {
168         return __cmsg_nxthdr(__msg->msg_control, __msg->msg_controllen, __cmsg);
169 }
170 
171 static inline size_t msg_data_left(struct msghdr *msg)
172 {
173         return iov_iter_count(&msg->msg_iter);
174 }
175 
176 /* "Socket"-level control message types: */
177 
178 #define SCM_RIGHTS      0x01            /* rw: access rights (array of int) */
179 #define SCM_CREDENTIALS 0x02            /* rw: struct ucred             */
180 #define SCM_SECURITY    0x03            /* rw: security label           */
181 #define SCM_PIDFD       0x04            /* ro: pidfd (int)              */
182 
183 struct ucred {
184         __u32   pid;
185         __u32   uid;
186         __u32   gid;
187 };
188 
189 /* Supported address families. */
190 #define AF_UNSPEC       0
191 #define AF_UNIX         1       /* Unix domain sockets          */
192 #define AF_LOCAL        1       /* POSIX name for AF_UNIX       */
193 #define AF_INET         2       /* Internet IP Protocol         */
194 #define AF_AX25         3       /* Amateur Radio AX.25          */
195 #define AF_IPX          4       /* Novell IPX                   */
196 #define AF_APPLETALK    5       /* AppleTalk DDP                */
197 #define AF_NETROM       6       /* Amateur Radio NET/ROM        */
198 #define AF_BRIDGE       7       /* Multiprotocol bridge         */
199 #define AF_ATMPVC       8       /* ATM PVCs                     */
200 #define AF_X25          9       /* Reserved for X.25 project    */
201 #define AF_INET6        10      /* IP version 6                 */
202 #define AF_ROSE         11      /* Amateur Radio X.25 PLP       */
203 #define AF_DECnet       12      /* Reserved for DECnet project  */
204 #define AF_NETBEUI      13      /* Reserved for 802.2LLC project*/
205 #define AF_SECURITY     14      /* Security callback pseudo AF */
206 #define AF_KEY          15      /* PF_KEY key management API */
207 #define AF_NETLINK      16
208 #define AF_ROUTE        AF_NETLINK /* Alias to emulate 4.4BSD */
209 #define AF_PACKET       17      /* Packet family                */
210 #define AF_ASH          18      /* Ash                          */
211 #define AF_ECONET       19      /* Acorn Econet                 */
212 #define AF_ATMSVC       20      /* ATM SVCs                     */
213 #define AF_RDS          21      /* RDS sockets                  */
214 #define AF_SNA          22      /* Linux SNA Project (nutters!) */
215 #define AF_IRDA         23      /* IRDA sockets                 */
216 #define AF_PPPOX        24      /* PPPoX sockets                */
217 #define AF_WANPIPE      25      /* Wanpipe API Sockets */
218 #define AF_LLC          26      /* Linux LLC                    */
219 #define AF_IB           27      /* Native InfiniBand address    */
220 #define AF_MPLS         28      /* MPLS */
221 #define AF_CAN          29      /* Controller Area Network      */
222 #define AF_TIPC         30      /* TIPC sockets                 */
223 #define AF_BLUETOOTH    31      /* Bluetooth sockets            */
224 #define AF_IUCV         32      /* IUCV sockets                 */
225 #define AF_RXRPC        33      /* RxRPC sockets                */
226 #define AF_ISDN         34      /* mISDN sockets                */
227 #define AF_PHONET       35      /* Phonet sockets               */
228 #define AF_IEEE802154   36      /* IEEE802154 sockets           */
229 #define AF_CAIF         37      /* CAIF sockets                 */
230 #define AF_ALG          38      /* Algorithm sockets            */
231 #define AF_NFC          39      /* NFC sockets                  */
232 #define AF_VSOCK        40      /* vSockets                     */
233 #define AF_KCM          41      /* Kernel Connection Multiplexor*/
234 #define AF_QIPCRTR      42      /* Qualcomm IPC Router          */
235 #define AF_SMC          43      /* smc sockets: reserve number for
236                                  * PF_SMC protocol family that
237                                  * reuses AF_INET address family
238                                  */
239 #define AF_XDP          44      /* XDP sockets                  */
240 #define AF_MCTP         45      /* Management component
241                                  * transport protocol
242                                  */
243 
244 #define AF_MAX          46      /* For now.. */
245 
246 /* Protocol families, same as address families. */
247 #define PF_UNSPEC       AF_UNSPEC
248 #define PF_UNIX         AF_UNIX
249 #define PF_LOCAL        AF_LOCAL
250 #define PF_INET         AF_INET
251 #define PF_AX25         AF_AX25
252 #define PF_IPX          AF_IPX
253 #define PF_APPLETALK    AF_APPLETALK
254 #define PF_NETROM       AF_NETROM
255 #define PF_BRIDGE       AF_BRIDGE
256 #define PF_ATMPVC       AF_ATMPVC
257 #define PF_X25          AF_X25
258 #define PF_INET6        AF_INET6
259 #define PF_ROSE         AF_ROSE
260 #define PF_DECnet       AF_DECnet
261 #define PF_NETBEUI      AF_NETBEUI
262 #define PF_SECURITY     AF_SECURITY
263 #define PF_KEY          AF_KEY
264 #define PF_NETLINK      AF_NETLINK
265 #define PF_ROUTE        AF_ROUTE
266 #define PF_PACKET       AF_PACKET
267 #define PF_ASH          AF_ASH
268 #define PF_ECONET       AF_ECONET
269 #define PF_ATMSVC       AF_ATMSVC
270 #define PF_RDS          AF_RDS
271 #define PF_SNA          AF_SNA
272 #define PF_IRDA         AF_IRDA
273 #define PF_PPPOX        AF_PPPOX
274 #define PF_WANPIPE      AF_WANPIPE
275 #define PF_LLC          AF_LLC
276 #define PF_IB           AF_IB
277 #define PF_MPLS         AF_MPLS
278 #define PF_CAN          AF_CAN
279 #define PF_TIPC         AF_TIPC
280 #define PF_BLUETOOTH    AF_BLUETOOTH
281 #define PF_IUCV         AF_IUCV
282 #define PF_RXRPC        AF_RXRPC
283 #define PF_ISDN         AF_ISDN
284 #define PF_PHONET       AF_PHONET
285 #define PF_IEEE802154   AF_IEEE802154
286 #define PF_CAIF         AF_CAIF
287 #define PF_ALG          AF_ALG
288 #define PF_NFC          AF_NFC
289 #define PF_VSOCK        AF_VSOCK
290 #define PF_KCM          AF_KCM
291 #define PF_QIPCRTR      AF_QIPCRTR
292 #define PF_SMC          AF_SMC
293 #define PF_XDP          AF_XDP
294 #define PF_MCTP         AF_MCTP
295 #define PF_MAX          AF_MAX
296 
297 /* Maximum queue length specifiable by listen.  */
298 #define SOMAXCONN       4096
299 
300 /* Flags we can use with send/ and recv.
301    Added those for 1003.1g not all are supported yet
302  */
303 
304 #define MSG_OOB         1
305 #define MSG_PEEK        2
306 #define MSG_DONTROUTE   4
307 #define MSG_TRYHARD     4       /* Synonym for MSG_DONTROUTE for DECnet */
308 #define MSG_CTRUNC      8
309 #define MSG_PROBE       0x10    /* Do not send. Only probe path f.e. for MTU */
310 #define MSG_TRUNC       0x20
311 #define MSG_DONTWAIT    0x40    /* Nonblocking io                */
312 #define MSG_EOR         0x80    /* End of record */
313 #define MSG_WAITALL     0x100   /* Wait for a full request */
314 #define MSG_FIN         0x200
315 #define MSG_SYN         0x400
316 #define MSG_CONFIRM     0x800   /* Confirm path validity */
317 #define MSG_RST         0x1000
318 #define MSG_ERRQUEUE    0x2000  /* Fetch message from error queue */
319 #define MSG_NOSIGNAL    0x4000  /* Do not generate SIGPIPE */
320 #define MSG_MORE        0x8000  /* Sender will send more */
321 #define MSG_WAITFORONE  0x10000 /* recvmmsg(): block until 1+ packets avail */
322 #define MSG_SENDPAGE_NOPOLICY 0x10000 /* sendpage() internal : do no apply policy */
323 #define MSG_BATCH       0x40000 /* sendmmsg(): more messages coming */
324 #define MSG_EOF         MSG_FIN
325 #define MSG_NO_SHARED_FRAGS 0x80000 /* sendpage() internal : page frags are not shared */
326 #define MSG_SENDPAGE_DECRYPTED  0x100000 /* sendpage() internal : page may carry
327                                           * plain text and require encryption
328                                           */
329 
330 #define MSG_ZEROCOPY    0x4000000       /* Use user data in kernel path */
331 #define MSG_SPLICE_PAGES 0x8000000      /* Splice the pages from the iterator in sendmsg() */
332 #define MSG_FASTOPEN    0x20000000      /* Send data in TCP SYN */
333 #define MSG_CMSG_CLOEXEC 0x40000000     /* Set close_on_exec for file
334                                            descriptor received through
335                                            SCM_RIGHTS */
336 #if defined(CONFIG_COMPAT)
337 #define MSG_CMSG_COMPAT 0x80000000      /* This message needs 32 bit fixups */
338 #else
339 #define MSG_CMSG_COMPAT 0               /* We never have 32 bit fixups */
340 #endif
341 
342 /* Flags to be cleared on entry by sendmsg and sendmmsg syscalls */
343 #define MSG_INTERNAL_SENDMSG_FLAGS \
344         (MSG_SPLICE_PAGES | MSG_SENDPAGE_NOPOLICY | MSG_SENDPAGE_DECRYPTED)
345 
346 /* Setsockoptions(2) level. Thanks to BSD these must match IPPROTO_xxx */
347 #define SOL_IP          0
348 /* #define SOL_ICMP     1       No-no-no! Due to Linux :-) we cannot use SOL_ICMP=1 */
349 #define SOL_TCP         6
350 #define SOL_UDP         17
351 #define SOL_IPV6        41
352 #define SOL_ICMPV6      58
353 #define SOL_SCTP        132
354 #define SOL_UDPLITE     136     /* UDP-Lite (RFC 3828) */
355 #define SOL_RAW         255
356 #define SOL_IPX         256
357 #define SOL_AX25        257
358 #define SOL_ATALK       258
359 #define SOL_NETROM      259
360 #define SOL_ROSE        260
361 #define SOL_DECNET      261
362 #define SOL_X25         262
363 #define SOL_PACKET      263
364 #define SOL_ATM         264     /* ATM layer (cell level) */
365 #define SOL_AAL         265     /* ATM Adaption Layer (packet level) */
366 #define SOL_IRDA        266
367 #define SOL_NETBEUI     267
368 #define SOL_LLC         268
369 #define SOL_DCCP        269
370 #define SOL_NETLINK     270
371 #define SOL_TIPC        271
372 #define SOL_RXRPC       272
373 #define SOL_PPPOL2TP    273
374 #define SOL_BLUETOOTH   274
375 #define SOL_PNPIPE      275
376 #define SOL_RDS         276
377 #define SOL_IUCV        277
378 #define SOL_CAIF        278
379 #define SOL_ALG         279
380 #define SOL_NFC         280
381 #define SOL_KCM         281
382 #define SOL_TLS         282
383 #define SOL_XDP         283
384 #define SOL_MPTCP       284
385 #define SOL_MCTP        285
386 #define SOL_SMC         286
387 #define SOL_VSOCK       287
388 
389 /* IPX options */
390 #define IPX_TYPE        1
391 
392 extern int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr);
393 extern int put_cmsg(struct msghdr*, int level, int type, int len, void *data);
394 
395 struct timespec64;
396 struct __kernel_timespec;
397 struct old_timespec32;
398 
399 struct scm_timestamping_internal {
400         struct timespec64 ts[3];
401 };
402 
403 extern void put_cmsg_scm_timestamping64(struct msghdr *msg, struct scm_timestamping_internal *tss);
404 extern void put_cmsg_scm_timestamping(struct msghdr *msg, struct scm_timestamping_internal *tss);
405 
406 /* The __sys_...msg variants allow MSG_CMSG_COMPAT iff
407  * forbid_cmsg_compat==false
408  */
409 extern long __sys_recvmsg(int fd, struct user_msghdr __user *msg,
410                           unsigned int flags, bool forbid_cmsg_compat);
411 extern long __sys_sendmsg(int fd, struct user_msghdr __user *msg,
412                           unsigned int flags, bool forbid_cmsg_compat);
413 extern int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg,
414                           unsigned int vlen, unsigned int flags,
415                           struct __kernel_timespec __user *timeout,
416                           struct old_timespec32 __user *timeout32);
417 extern int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg,
418                           unsigned int vlen, unsigned int flags,
419                           bool forbid_cmsg_compat);
420 extern long __sys_sendmsg_sock(struct socket *sock, struct msghdr *msg,
421                                unsigned int flags);
422 extern long __sys_recvmsg_sock(struct socket *sock, struct msghdr *msg,
423                                struct user_msghdr __user *umsg,
424                                struct sockaddr __user *uaddr,
425                                unsigned int flags);
426 extern int __copy_msghdr(struct msghdr *kmsg,
427                          struct user_msghdr *umsg,
428                          struct sockaddr __user **save_addr);
429 
430 /* helpers which do the actual work for syscalls */
431 extern int __sys_recvfrom(int fd, void __user *ubuf, size_t size,
432                           unsigned int flags, struct sockaddr __user *addr,
433                           int __user *addr_len);
434 extern int __sys_sendto(int fd, void __user *buff, size_t len,
435                         unsigned int flags, struct sockaddr __user *addr,
436                         int addr_len);
437 extern struct file *do_accept(struct file *file, struct proto_accept_arg *arg,
438                               struct sockaddr __user *upeer_sockaddr,
439                               int __user *upeer_addrlen, int flags);
440 extern int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr,
441                          int __user *upeer_addrlen, int flags);
442 extern int __sys_socket(int family, int type, int protocol);
443 extern struct file *__sys_socket_file(int family, int type, int protocol);
444 extern int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen);
445 extern int __sys_bind_socket(struct socket *sock, struct sockaddr_storage *address,
446                              int addrlen);
447 extern int __sys_connect_file(struct file *file, struct sockaddr_storage *addr,
448                               int addrlen, int file_flags);
449 extern int __sys_connect(int fd, struct sockaddr __user *uservaddr,
450                          int addrlen);
451 extern int __sys_listen(int fd, int backlog);
452 extern int __sys_listen_socket(struct socket *sock, int backlog);
453 extern int __sys_getsockname(int fd, struct sockaddr __user *usockaddr,
454                              int __user *usockaddr_len);
455 extern int __sys_getpeername(int fd, struct sockaddr __user *usockaddr,
456                              int __user *usockaddr_len);
457 extern int __sys_socketpair(int family, int type, int protocol,
458                             int __user *usockvec);
459 extern int __sys_shutdown_sock(struct socket *sock, int how);
460 extern int __sys_shutdown(int fd, int how);
461 #endif /* _LINUX_SOCKET_H */
462 

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