Quelle socket.h Sprache: C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_SOCKET_H
#define _LINUX_SOCKET_H

#include <asm/socket.h>   /* arch-dependent defines */
#include <linux/sockios.h>  /* the SIOCxxx I/O controls */
#include <linux/uio.h>   /* iovec support */
#include <linux/types.h>  /* pid_t */
#include <linux/compiler.h>  /* __user */
#include <uapi/linux/socket.h>

struct file;
struct pid;
struct cred;
struct socket;
struct sock;
struct sk_buff;
struct proto_accept_arg;

#define __sockaddr_check_size(size) \
BUILD_BUG_ON(((size) > sizeof(struct __kernel_sockaddr_storage)))

#ifdef CONFIG_PROC_FS
struct seq_file;
extern void socket_seq_show(struct seq_file *seq);
#endif

typedef __kernel_sa_family_t sa_family_t;

/*
* 1003.1g requires sa_family_t and that sa_data is char.
*/

struct sockaddr {
sa_family_t sa_family; /* address family, AF_xxx */
union {
  char sa_data_min[14];  /* Minimum 14 bytes of protocol address */
  DECLARE_FLEX_ARRAY(char, sa_data);
};
};

struct linger {
int  l_onoff; /* Linger active */
int  l_linger; /* How long to linger for */
};

#define sockaddr_storage __kernel_sockaddr_storage

/*
* As we do 4.4BSD message passing we use a 4.4BSD message passing
* system, not 4.3. Thus msg_accrights(len) are now missing. They
* belong in an obscure libc emulation or the bin.
*/

struct msghdr {
void  *msg_name; /* ptr to socket address structure */
int  msg_namelen; /* size of socket address structure */

int  msg_inq; /* output, data left in socket */

struct iov_iter msg_iter; /* data */

/*
* Ancillary data. msg_control_user is the user buffer used for the
* recv* side when msg_control_is_user is set, msg_control is the kernel
* buffer used for all other cases.
*/
union {
  void  *msg_control;
  void __user *msg_control_user;
};
bool  msg_control_is_user : 1;
bool  msg_get_inq : 1;/* return INQ after receive */
unsigned int msg_flags; /* flags on received message */
__kernel_size_t msg_controllen; /* ancillary data buffer length */
struct kiocb *msg_iocb; /* ptr to iocb for async requests */
struct ubuf_info *msg_ubuf;
int (*sg_from_iter)(struct sk_buff *skb,
       struct iov_iter *from, size_t length);
};

struct user_msghdr {
void  __user *msg_name; /* ptr to socket address structure */
int  msg_namelen;  /* size of socket address structure */
struct iovec __user *msg_iov; /* scatter/gather array */
__kernel_size_t msg_iovlen;  /* # elements in msg_iov */
void  __user *msg_control; /* ancillary data */
__kernel_size_t msg_controllen;  /* ancillary data buffer length */
unsigned int msg_flags;  /* flags on received message */
};

/* For recvmmsg/sendmmsg */
struct mmsghdr {
struct user_msghdr  msg_hdr;
unsigned int        msg_len;
};

/*
* POSIX 1003.1g - ancillary data object information
* Ancillary data consists of a sequence of pairs of
* (cmsghdr, cmsg_data[])
*/

struct cmsghdr {
__kernel_size_t cmsg_len; /* data byte count, including hdr */
        int  cmsg_level; /* originating protocol */
        int  cmsg_type; /* protocol-specific type */
};

/*
* Ancillary data object information MACROS
* Table 5-14 of POSIX 1003.1g
*/

#define __CMSG_NXTHDR(ctl, len, cmsg) __cmsg_nxthdr((ctl),(len),(cmsg))
#define CMSG_NXTHDR(mhdr, cmsg) cmsg_nxthdr((mhdr), (cmsg))

#define CMSG_ALIGN(len) ( ((len)+sizeof(long)-1) & ~(sizeof(long)-1) )

#define CMSG_DATA(cmsg) \
((void *)(cmsg) + sizeof(struct cmsghdr))
#define CMSG_USER_DATA(cmsg) \
((void __user *)(cmsg) + sizeof(struct cmsghdr))
#define CMSG_SPACE(len) (sizeof(struct cmsghdr) + CMSG_ALIGN(len))
#define CMSG_LEN(len) (sizeof(struct cmsghdr) + (len))

#define __CMSG_FIRSTHDR(ctl,len) ((len) >= sizeof(struct cmsghdr) ? \
      (struct cmsghdr *)(ctl) : \
      (struct cmsghdr *)NULL)
#define CMSG_FIRSTHDR(msg) __CMSG_FIRSTHDR((msg)->msg_control, (msg)->msg_controllen)
#define CMSG_OK(mhdr, cmsg) ((cmsg)->cmsg_len >= sizeof(struct cmsghdr) && \
        (cmsg)->cmsg_len <= (unsigned long) \
        ((mhdr)->msg_controllen - \
         ((char *)(cmsg) - (char *)(mhdr)->msg_control)))
#define for_each_cmsghdr(cmsg, msg) \
for (cmsg = CMSG_FIRSTHDR(msg); \
      cmsg; \
      cmsg = CMSG_NXTHDR(msg, cmsg))

/*
* Get the next cmsg header
*
* PLEASE, do not touch this function. If you think, that it is
* incorrect, grep kernel sources and think about consequences
* before trying to improve it.
*
* Now it always returns valid, not truncated ancillary object
* HEADER. But caller still MUST check, that cmsg->cmsg_len is
* inside range, given by msg->msg_controllen before using
* ancillary object DATA. --ANK (980731)
*/

static inline struct cmsghdr * __cmsg_nxthdr(void *__ctl, __kernel_size_t __size,
            struct cmsghdr *__cmsg)
{
struct cmsghdr * __ptr;

__ptr = (struct cmsghdr*)(((unsigned char *) __cmsg) +  CMSG_ALIGN(__cmsg->cmsg_len));
if ((unsigned long)((char*)(__ptr+1) - (char *) __ctl) > __size)
  return (struct cmsghdr *)0;

return __ptr;
}

static inline struct cmsghdr * cmsg_nxthdr (struct msghdr *__msg, struct cmsghdr *__cmsg)
{
return __cmsg_nxthdr(__msg->msg_control, __msg->msg_controllen, __cmsg);
}

static inline size_t msg_data_left(const struct msghdr *msg)
{
return iov_iter_count(&msg->msg_iter);
}

/* "Socket"-level control message types: */

#define SCM_RIGHTS 0x01  /* rw: access rights (array of int) */
#define SCM_CREDENTIALS 0x02  /* rw: struct ucred */
#define SCM_SECURITY 0x03  /* rw: security label */
#define SCM_PIDFD 0x04  /* ro: pidfd (int) */

struct ucred {
__u32 pid;
__u32 uid;
__u32 gid;
};

/* Supported address families. */
#define AF_UNSPEC 0
#define AF_UNIX  1 /* Unix domain sockets */
#define AF_LOCAL 1 /* POSIX name for AF_UNIX */
#define AF_INET  2 /* Internet IP Protocol */
#define AF_AX25  3 /* Amateur Radio AX.25 */
#define AF_IPX  4 /* Novell IPX */
#define AF_APPLETALK 5 /* AppleTalk DDP */
#define AF_NETROM 6 /* Amateur Radio NET/ROM */
#define AF_BRIDGE 7 /* Multiprotocol bridge */
#define AF_ATMPVC 8 /* ATM PVCs */
#define AF_X25  9 /* Reserved for X.25 project */
#define AF_INET6 10 /* IP version 6 */
#define AF_ROSE  11 /* Amateur Radio X.25 PLP */
#define AF_DECnet 12 /* Reserved for DECnet project */
#define AF_NETBEUI 13 /* Reserved for 802.2LLC project*/
#define AF_SECURITY 14 /* Security callback pseudo AF */
#define AF_KEY  15      /* PF_KEY key management API */
#define AF_NETLINK 16
#define AF_ROUTE AF_NETLINK /* Alias to emulate 4.4BSD */
#define AF_PACKET 17 /* Packet family */
#define AF_ASH  18 /* Ash */
#define AF_ECONET 19 /* Acorn Econet */
#define AF_ATMSVC 20 /* ATM SVCs */
#define AF_RDS  21 /* RDS sockets */
#define AF_SNA  22 /* Linux SNA Project (nutters!) */
#define AF_IRDA  23 /* IRDA sockets */
#define AF_PPPOX 24 /* PPPoX sockets */
#define AF_WANPIPE 25 /* Wanpipe API Sockets */
#define AF_LLC  26 /* Linux LLC */
#define AF_IB  27 /* Native InfiniBand address */
#define AF_MPLS  28 /* MPLS */
#define AF_CAN  29 /* Controller Area Network      */
#define AF_TIPC  30 /* TIPC sockets */
#define AF_BLUETOOTH 31 /* Bluetooth sockets */
#define AF_IUCV  32 /* IUCV sockets */
#define AF_RXRPC 33 /* RxRPC sockets */
#define AF_ISDN  34 /* mISDN sockets */
#define AF_PHONET 35 /* Phonet sockets */
#define AF_IEEE802154 36 /* IEEE802154 sockets */
#define AF_CAIF  37 /* CAIF sockets */
#define AF_ALG  38 /* Algorithm sockets */
#define AF_NFC  39 /* NFC sockets */
#define AF_VSOCK 40 /* vSockets */
#define AF_KCM  41 /* Kernel Connection Multiplexor*/
#define AF_QIPCRTR 42 /* Qualcomm IPC Router          */
#define AF_SMC  43 /* smc sockets: reserve number for
* PF_SMC protocol family that
* reuses AF_INET address family
*/
#define AF_XDP  44 /* XDP sockets */
#define AF_MCTP  45 /* Management component
* transport protocol
*/

#define AF_MAX  46 /* For now.. */

/* Protocol families, same as address families. */
#define PF_UNSPEC AF_UNSPEC
#define PF_UNIX  AF_UNIX
#define PF_LOCAL AF_LOCAL
#define PF_INET  AF_INET
#define PF_AX25  AF_AX25
#define PF_IPX  AF_IPX
#define PF_APPLETALK AF_APPLETALK
#define PF_NETROM AF_NETROM
#define PF_BRIDGE AF_BRIDGE
#define PF_ATMPVC AF_ATMPVC
#define PF_X25  AF_X25
#define PF_INET6 AF_INET6
#define PF_ROSE  AF_ROSE
#define PF_DECnet AF_DECnet
#define PF_NETBEUI AF_NETBEUI
#define PF_SECURITY AF_SECURITY
#define PF_KEY  AF_KEY
#define PF_NETLINK AF_NETLINK
#define PF_ROUTE AF_ROUTE
#define PF_PACKET AF_PACKET
#define PF_ASH  AF_ASH
#define PF_ECONET AF_ECONET
#define PF_ATMSVC AF_ATMSVC
#define PF_RDS  AF_RDS
#define PF_SNA  AF_SNA
#define PF_IRDA  AF_IRDA
#define PF_PPPOX AF_PPPOX
#define PF_WANPIPE AF_WANPIPE
#define PF_LLC  AF_LLC
#define PF_IB  AF_IB
#define PF_MPLS  AF_MPLS
#define PF_CAN  AF_CAN
#define PF_TIPC  AF_TIPC
#define PF_BLUETOOTH AF_BLUETOOTH
#define PF_IUCV  AF_IUCV
#define PF_RXRPC AF_RXRPC
#define PF_ISDN  AF_ISDN
#define PF_PHONET AF_PHONET
#define PF_IEEE802154 AF_IEEE802154
#define PF_CAIF  AF_CAIF
#define PF_ALG  AF_ALG
#define PF_NFC  AF_NFC
#define PF_VSOCK AF_VSOCK
#define PF_KCM  AF_KCM
#define PF_QIPCRTR AF_QIPCRTR
#define PF_SMC  AF_SMC
#define PF_XDP  AF_XDP
#define PF_MCTP  AF_MCTP
#define PF_MAX  AF_MAX

/* Maximum queue length specifiable by listen.  */
#define SOMAXCONN 4096

/* Flags we can use with send/ and recv.
   Added those for 1003.1g not all are supported yet
*/

#define MSG_OOB  1
#define MSG_PEEK 2
#define MSG_DONTROUTE 4
#define MSG_TRYHARD     4       /* Synonym for MSG_DONTROUTE for DECnet */
#define MSG_CTRUNC 8
#define MSG_PROBE 0x10 /* Do not send. Only probe path f.e. for MTU */
#define MSG_TRUNC 0x20
#define MSG_DONTWAIT 0x40 /* Nonblocking io */
#define MSG_EOR         0x80 /* End of record */
#define MSG_WAITALL 0x100 /* Wait for a full request */
#define MSG_FIN         0x200
#define MSG_SYN  0x400
#define MSG_CONFIRM 0x800 /* Confirm path validity */
#define MSG_RST  0x1000
#define MSG_ERRQUEUE 0x2000 /* Fetch message from error queue */
#define MSG_NOSIGNAL 0x4000 /* Do not generate SIGPIPE */
#define MSG_MORE 0x8000 /* Sender will send more */
#define MSG_WAITFORONE 0x10000 /* recvmmsg(): block until 1+ packets avail */
#define MSG_SENDPAGE_NOPOLICY 0x10000 /* sendpage() internal : do no apply policy */
#define MSG_BATCH 0x40000 /* sendmmsg(): more messages coming */
#define MSG_EOF         MSG_FIN
#define MSG_NO_SHARED_FRAGS 0x80000 /* sendpage() internal : page frags are not shared */
#define MSG_SENDPAGE_DECRYPTED 0x100000 /* sendpage() internal : page may carry
  * plain text and require encryption
  */

#define MSG_SOCK_DEVMEM 0x2000000 /* Receive devmem skbs as cmsg */
#define MSG_ZEROCOPY 0x4000000 /* Use user data in kernel path */
#define MSG_SPLICE_PAGES 0x8000000 /* Splice the pages from the iterator in sendmsg() */
#define MSG_FASTOPEN 0x20000000 /* Send data in TCP SYN */
#define MSG_CMSG_CLOEXEC 0x40000000 /* Set close_on_exec for file
   descriptor received through
   SCM_RIGHTS */
#if defined(CONFIG_COMPAT)
#define MSG_CMSG_COMPAT 0x80000000 /* This message needs 32 bit fixups */
#else
#define MSG_CMSG_COMPAT 0  /* We never have 32 bit fixups */
#endif

/* Flags to be cleared on entry by sendmsg and sendmmsg syscalls */
#define MSG_INTERNAL_SENDMSG_FLAGS \
(MSG_SPLICE_PAGES | MSG_SENDPAGE_NOPOLICY | MSG_SENDPAGE_DECRYPTED)

/* Setsockoptions(2) level. Thanks to BSD these must match IPPROTO_xxx */
#define SOL_IP  0
/* #define SOL_ICMP 1 No-no-no! Due to Linux :-) we cannot use SOL_ICMP=1 */
#define SOL_TCP  6
#define SOL_UDP  17
#define SOL_IPV6 41
#define SOL_ICMPV6 58
#define SOL_SCTP 132
#define SOL_UDPLITE 136     /* UDP-Lite (RFC 3828) */
#define SOL_RAW  255
#define SOL_IPX  256
#define SOL_AX25 257
#define SOL_ATALK 258
#define SOL_NETROM 259
#define SOL_ROSE 260
#define SOL_DECNET 261
#define SOL_X25  262
#define SOL_PACKET 263
#define SOL_ATM  264 /* ATM layer (cell level) */
#define SOL_AAL  265 /* ATM Adaption Layer (packet level) */
#define SOL_IRDA        266
#define SOL_NETBEUI 267
#define SOL_LLC  268
#define SOL_DCCP 269
#define SOL_NETLINK 270
#define SOL_TIPC 271
#define SOL_RXRPC 272
#define SOL_PPPOL2TP 273
#define SOL_BLUETOOTH 274
#define SOL_PNPIPE 275
#define SOL_RDS  276
#define SOL_IUCV 277
#define SOL_CAIF 278
#define SOL_ALG  279
#define SOL_NFC  280
#define SOL_KCM  281
#define SOL_TLS  282
#define SOL_XDP  283
#define SOL_MPTCP 284
#define SOL_MCTP 285
#define SOL_SMC  286
#define SOL_VSOCK 287

/* IPX options */
#define IPX_TYPE 1

extern int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr);
extern int put_cmsg(struct msghdr*, int level, int type, int len, void *data);
extern int put_cmsg_notrunc(struct msghdr *msg, int level, int type, int len,
       void *data);

struct timespec64;
struct __kernel_timespec;
struct old_timespec32;

struct scm_timestamping_internal {
struct timespec64 ts[3];
};

extern void put_cmsg_scm_timestamping64(struct msghdr *msg, struct scm_timestamping_internal *tss);
extern void put_cmsg_scm_timestamping(struct msghdr *msg, struct scm_timestamping_internal *tss);

/* The __sys_...msg variants allow MSG_CMSG_COMPAT iff
* forbid_cmsg_compat==false
*/
extern long __sys_recvmsg(int fd, struct user_msghdr __user *msg,
     unsigned int flags, bool forbid_cmsg_compat);
extern long __sys_sendmsg(int fd, struct user_msghdr __user *msg,
     unsigned int flags, bool forbid_cmsg_compat);
extern int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg,
     unsigned int vlen, unsigned int flags,
     struct __kernel_timespec __user *timeout,
     struct old_timespec32 __user *timeout32);
extern int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg,
     unsigned int vlen, unsigned int flags,
     bool forbid_cmsg_compat);
extern long __sys_sendmsg_sock(struct socket *sock, struct msghdr *msg,
          unsigned int flags);
extern long __sys_recvmsg_sock(struct socket *sock, struct msghdr *msg,
          struct user_msghdr __user *umsg,
          struct sockaddr __user *uaddr,
          unsigned int flags);
extern int __copy_msghdr(struct msghdr *kmsg,
    struct user_msghdr *umsg,
    struct sockaddr __user **save_addr);

/* helpers which do the actual work for syscalls */
extern int __sys_recvfrom(int fd, void __user *ubuf, size_t size,
     unsigned int flags, struct sockaddr __user *addr,
     int __user *addr_len);
extern int __sys_sendto(int fd, void __user *buff, size_t len,
   unsigned int flags, struct sockaddr __user *addr,
   int addr_len);
extern struct file *do_accept(struct file *file, struct proto_accept_arg *arg,
         struct sockaddr __user *upeer_sockaddr,
         int __user *upeer_addrlen, int flags);
extern int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr,
    int __user *upeer_addrlen, int flags);
extern int __sys_socket(int family, int type, int protocol);
extern struct file *__sys_socket_file(int family, int type, int protocol);
extern int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen);
extern int __sys_bind_socket(struct socket *sock, struct sockaddr_storage *address,
        int addrlen);
extern int __sys_connect_file(struct file *file, struct sockaddr_storage *addr,
         int addrlen, int file_flags);
extern int __sys_connect(int fd, struct sockaddr __user *uservaddr,
    int addrlen);
extern int __sys_listen(int fd, int backlog);
extern int __sys_listen_socket(struct socket *sock, int backlog);
extern int __sys_getsockname(int fd, struct sockaddr __user *usockaddr,
        int __user *usockaddr_len);
extern int __sys_getpeername(int fd, struct sockaddr __user *usockaddr,
        int __user *usockaddr_len);
extern int __sys_socketpair(int family, int type, int protocol,
       int __user *usockvec);
extern int __sys_shutdown_sock(struct socket *sock, int how);
extern int __sys_shutdown(int fd, int how);
#endif /* _LINUX_SOCKET_H */

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