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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 pid;
 14 struct cred;
 15 
 16 #define __sockaddr_check_size(size)     \
 17         BUILD_BUG_ON(((size) > sizeof(struct __kernel_sockaddr_storage)))
 18 
 19 #ifdef CONFIG_PROC_FS
 20 struct seq_file;
 21 extern void socket_seq_show(struct seq_file *seq);
 22 #endif
 23 
 24 typedef __kernel_sa_family_t    sa_family_t;
 25 
 26 /*
 27  *      1003.1g requires sa_family_t and that sa_data is char.
 28  */
 29  
 30 struct sockaddr {
 31         sa_family_t     sa_family;      /* address family, AF_xxx       */
 32         char            sa_data[14];    /* 14 bytes of protocol address */
 33 };
 34 
 35 struct 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  
 48 struct 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  
 58 struct 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 */
 69 struct 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 
 80 struct 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  
126 static 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 
138 static 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 
143 static 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 
154 struct 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 
348 extern int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr);
349 extern int put_cmsg(struct msghdr*, int level, int type, int len, void *data);
350 
351 struct timespec;
352 
353 /* The __sys_...msg variants allow MSG_CMSG_COMPAT iff
354  * forbid_cmsg_compat==false
355  */
356 extern long __sys_recvmsg(int fd, struct user_msghdr __user *msg,
357                           unsigned int flags, bool forbid_cmsg_compat);
358 extern long __sys_sendmsg(int fd, struct user_msghdr __user *msg,
359                           unsigned int flags, bool forbid_cmsg_compat);
360 extern int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
361                           unsigned int flags, struct timespec *timeout);
362 extern 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 */
367 extern int __sys_recvfrom(int fd, void __user *ubuf, size_t size,
368                           unsigned int flags, struct sockaddr __user *addr,
369                           int __user *addr_len);
370 extern int __sys_sendto(int fd, void __user *buff, size_t len,
371                         unsigned int flags, struct sockaddr __user *addr,
372                         int addr_len);
373 extern int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr,
374                          int __user *upeer_addrlen, int flags);
375 extern int __sys_socket(int family, int type, int protocol);
376 extern int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen);
377 extern int __sys_connect(int fd, struct sockaddr __user *uservaddr,
378                          int addrlen);
379 extern int __sys_listen(int fd, int backlog);
380 extern int __sys_getsockname(int fd, struct sockaddr __user *usockaddr,
381                              int __user *usockaddr_len);
382 extern int __sys_getpeername(int fd, struct sockaddr __user *usockaddr,
383                              int __user *usockaddr_len);
384 extern int __sys_socketpair(int family, int type, int protocol,
385                             int __user *usockvec);
386 extern int __sys_shutdown(int fd, int how);
387 
388 extern struct ns_common *get_net_ns(struct ns_common *ns);
389 #endif /* _LINUX_SOCKET_H */
390 

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