include/linux/net.h

   1 /*
   2  * NET          An implementation of the SOCKET network access protocol.
   3  *              This is the master header file for the Linux NET layer,
   4  *              or, in plain English: the networking handling part of the
   5  *              kernel.
   6  *
   7  * Version:     @(#)net.h       1.0.3   05/25/93
   8  *
   9  * Authors:     Orest Zborowski, <obz@Kodak.COM>
  10  *              Ross Biro
  11  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  12  *
  13  *              This program is free software; you can redistribute it and/or
  14  *              modify it under the terms of the GNU General Public License
  15  *              as published by the Free Software Foundation; either version
  16  *              2 of the License, or (at your option) any later version.
  17  */
  18 #ifndef _LINUX_NET_H
  19 #define _LINUX_NET_H
  20
  21 #include <linux/stringify.h>
  22 #include <linux/random.h>
  23 #include <linux/wait.h>
  24 #include <linux/fcntl.h>        /* For O_CLOEXEC and O_NONBLOCK */
  25 #include <linux/kmemcheck.h>
  26 #include <linux/rcupdate.h>
  27 #include <linux/jump_label.h>
  28 #include <uapi/linux/net.h>
  29
  30 struct poll_table_struct;
  31 struct pipe_inode_info;
  32 struct inode;
  33 struct file;
  34 struct net;
  35
  36 #define SOCK_ASYNC_NOSPACE      0
  37 #define SOCK_ASYNC_WAITDATA     1
  38 #define SOCK_NOSPACE            2
  39 #define SOCK_PASSCRED           3
  40 #define SOCK_PASSSEC            4
  41 #define SOCK_EXTERNALLY_ALLOCATED 5
  42
  43 #ifndef ARCH_HAS_SOCKET_TYPES
  44 /**
  45  * enum sock_type - Socket types
  46  * @SOCK_STREAM: stream (connection) socket
  47  * @SOCK_DGRAM: datagram (conn.less) socket
  48  * @SOCK_RAW: raw socket
  49  * @SOCK_RDM: reliably-delivered message
  50  * @SOCK_SEQPACKET: sequential packet socket
  51  * @SOCK_DCCP: Datagram Congestion Control Protocol socket
  52  * @SOCK_PACKET: linux specific way of getting packets at the dev level.
  53  *                For writing rarp and other similar things on the user level.
  54  *
  55  * When adding some new socket type please
  56  * grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS
  57  * overrides this enum for binary compat reasons.
  58  */
  59 enum sock_type {
  60         SOCK_STREAM     = 1,
  61         SOCK_DGRAM      = 2,
  62         SOCK_RAW        = 3,
  63         SOCK_RDM        = 4,
  64         SOCK_SEQPACKET  = 5,
  65         SOCK_DCCP       = 6,
  66         SOCK_PACKET     = 10,
  67 };
  68
  69 #define SOCK_MAX (SOCK_PACKET + 1)
  70 /* Mask which covers at least up to SOCK_MASK-1.  The
  71  * remaining bits are used as flags. */
  72 #define SOCK_TYPE_MASK 0xf
  73
  74 /* Flags for socket, socketpair, accept4 */
  75 #define SOCK_CLOEXEC    O_CLOEXEC
  76 #ifndef SOCK_NONBLOCK
  77 #define SOCK_NONBLOCK   O_NONBLOCK
  78 #endif
  79
  80 #endif /* ARCH_HAS_SOCKET_TYPES */
  81
  82 enum sock_shutdown_cmd {
  83         SHUT_RD,
  84         SHUT_WR,
  85         SHUT_RDWR,
  86 };
  87
  88 struct socket_wq {
  89         /* Note: wait MUST be first field of socket_wq */
  90         wait_queue_head_t       wait;
  91         struct fasync_struct    *fasync_list;
  92         struct rcu_head         rcu;
  93 } ____cacheline_aligned_in_smp;
  94
  95 /**
  96  *  struct socket - general BSD socket
  97  *  @state: socket state (%SS_CONNECTED, etc)
  98  *  @type: socket type (%SOCK_STREAM, etc)
  99  *  @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc)
 100  *  @ops: protocol specific socket operations
 101  *  @file: File back pointer for gc
 102  *  @sk: internal networking protocol agnostic socket representation
 103  *  @wq: wait queue for several uses
 104  */
 105 struct socket {
 106         socket_state            state;
 107
 108         kmemcheck_bitfield_begin(type);
 109         short                   type;
 110         kmemcheck_bitfield_end(type);
 111
 112         unsigned long           flags;
 113
 114         struct socket_wq __rcu  *wq;
 115
 116         struct file             *file;
 117         struct sock             *sk;
 118         const struct proto_ops  *ops;
 119 };
 120
 121 struct vm_area_struct;
 122 struct page;
 123 struct kiocb;
 124 struct sockaddr;
 125 struct msghdr;
 126 struct module;
 127
 128 struct proto_ops {
 129         int             family;
 130         struct module   *owner;
 131         int             (*release)   (struct socket *sock);
 132         int             (*bind)      (struct socket *sock,
 133                                       struct sockaddr *myaddr,
 134                                       int sockaddr_len);
 135         int             (*connect)   (struct socket *sock,
 136                                       struct sockaddr *vaddr,
 137                                       int sockaddr_len, int flags);
 138         int             (*socketpair)(struct socket *sock1,
 139                                       struct socket *sock2);
 140         int             (*accept)    (struct socket *sock,
 141                                       struct socket *newsock, int flags);
 142         int             (*getname)   (struct socket *sock,
 143                                       struct sockaddr *addr,
 144                                       int *sockaddr_len, int peer);
 145         unsigned int    (*poll)      (struct file *file, struct socket *sock,
 146                                       struct poll_table_struct *wait);
 147         int             (*ioctl)     (struct socket *sock, unsigned int cmd,
 148                                       unsigned long arg);
 149 #ifdef CONFIG_COMPAT
 150         int             (*compat_ioctl) (struct socket *sock, unsigned int cmd,
 151                                       unsigned long arg);
 152 #endif
 153         int             (*listen)    (struct socket *sock, int len);
 154         int             (*shutdown)  (struct socket *sock, int flags);
 155         int             (*setsockopt)(struct socket *sock, int level,
 156                                       int optname, char __user *optval, unsigned int optlen);
 157         int             (*getsockopt)(struct socket *sock, int level,
 158                                       int optname, char __user *optval, int __user *optlen);
 159 #ifdef CONFIG_COMPAT
 160         int             (*compat_setsockopt)(struct socket *sock, int level,
 161                                       int optname, char __user *optval, unsigned int optlen);
 162         int             (*compat_getsockopt)(struct socket *sock, int level,
 163                                       int optname, char __user *optval, int __user *optlen);
 164 #endif
 165         int             (*sendmsg)   (struct kiocb *iocb, struct socket *sock,
 166                                       struct msghdr *m, size_t total_len);
 167         /* Notes for implementing recvmsg:
 168          * ===============================
 169          * msg->msg_namelen should get updated by the recvmsg handlers
 170          * iff msg_name != NULL. It is by default 0 to prevent
 171          * returning uninitialized memory to user space.  The recvfrom
 172          * handlers can assume that msg.msg_name is either NULL or has
 173          * a minimum size of sizeof(struct sockaddr_storage).
 174          */
 175         int             (*recvmsg)   (struct kiocb *iocb, struct socket *sock,
 176                                       struct msghdr *m, size_t total_len,
 177                                       int flags);
 178         int             (*mmap)      (struct file *file, struct socket *sock,
 179                                       struct vm_area_struct * vma);
 180         ssize_t         (*sendpage)  (struct socket *sock, struct page *page,
 181                                       int offset, size_t size, int flags);
 182         ssize_t         (*splice_read)(struct socket *sock,  loff_t *ppos,
 183                                        struct pipe_inode_info *pipe, size_t len, unsigned int flags);
 184         int             (*set_peek_off)(struct sock *sk, int val);
 185 };
 186
 187 #define DECLARE_SOCKADDR(type, dst, src)        \
 188         type dst = ({ __sockaddr_check_size(sizeof(*dst)); (type) src; })
 189
 190 struct net_proto_family {
 191         int             family;
 192         int             (*create)(struct net *net, struct socket *sock,
 193                                   int protocol, int kern);
 194         struct module   *owner;
 195 };
 196
 197 struct iovec;
 198 struct kvec;
 199
 200 enum {
 201         SOCK_WAKE_IO,
 202         SOCK_WAKE_WAITD,
 203         SOCK_WAKE_SPACE,
 204         SOCK_WAKE_URG,
 205 };
 206
 207 int sock_wake_async(struct socket *sk, int how, int band);
 208 int sock_register(const struct net_proto_family *fam);
 209 void sock_unregister(int family);
 210 int __sock_create(struct net *net, int family, int type, int proto,
 211                   struct socket **res, int kern);
 212 int sock_create(int family, int type, int proto, struct socket **res);
 213 int sock_create_kern(int family, int type, int proto, struct socket **res);
 214 int sock_create_lite(int family, int type, int proto, struct socket **res);
 215 void sock_release(struct socket *sock);
 216 int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t len);
 217 int sock_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
 218                  int flags);
 219 struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname);
 220 struct socket *sockfd_lookup(int fd, int *err);
 221 struct socket *sock_from_file(struct file *file, int *err);
 222 #define              sockfd_put(sock) fput(sock->file)
 223 int net_ratelimit(void);
 224
 225 #define net_ratelimited_function(function, ...)                 \
 226 do {                                                            \
 227         if (net_ratelimit())                                    \
 228                 function(__VA_ARGS__);                          \
 229 } while (0)
 230
 231 #define net_emerg_ratelimited(fmt, ...)                         \
 232         net_ratelimited_function(pr_emerg, fmt, ##__VA_ARGS__)
 233 #define net_alert_ratelimited(fmt, ...)                         \
 234         net_ratelimited_function(pr_alert, fmt, ##__VA_ARGS__)
 235 #define net_crit_ratelimited(fmt, ...)                          \
 236         net_ratelimited_function(pr_crit, fmt, ##__VA_ARGS__)
 237 #define net_err_ratelimited(fmt, ...)                           \
 238         net_ratelimited_function(pr_err, fmt, ##__VA_ARGS__)
 239 #define net_notice_ratelimited(fmt, ...)                        \
 240         net_ratelimited_function(pr_notice, fmt, ##__VA_ARGS__)
 241 #define net_warn_ratelimited(fmt, ...)                          \
 242         net_ratelimited_function(pr_warn, fmt, ##__VA_ARGS__)
 243 #define net_info_ratelimited(fmt, ...)                          \
 244         net_ratelimited_function(pr_info, fmt, ##__VA_ARGS__)
 245 #define net_dbg_ratelimited(fmt, ...)                           \
 246         net_ratelimited_function(pr_debug, fmt, ##__VA_ARGS__)
 247
 248 bool __net_get_random_once(void *buf, int nbytes, bool *done,
 249                            struct static_key *done_key);
 250
 251 #define net_get_random_once(buf, nbytes)                                \
 252         ({                                                              \
 253                 bool ___ret = false;                                    \
 254                 static bool ___done = false;                            \
 255                 static struct static_key ___once_key =                  \
 256                         STATIC_KEY_INIT_TRUE;                           \
 257                 if (static_key_true(&___once_key))                      \
 258                         ___ret = __net_get_random_once(buf,             \
 259                                                        nbytes,          \
 260                                                        &___done,        \
 261                                                        &___once_key);   \
 262                 ___ret;                                                 \
 263         })
 264
 265 int kernel_sendmsg(struct socket *sock, struct msghdr *msg, struct kvec *vec,
 266                    size_t num, size_t len);
 267 int kernel_recvmsg(struct socket *sock, struct msghdr *msg, struct kvec *vec,
 268                    size_t num, size_t len, int flags);
 269
 270 int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen);
 271 int kernel_listen(struct socket *sock, int backlog);
 272 int kernel_accept(struct socket *sock, struct socket **newsock, int flags);
 273 int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
 274                    int flags);
 275 int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
 276                        int *addrlen);
 277 int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
 278                        int *addrlen);
 279 int kernel_getsockopt(struct socket *sock, int level, int optname, char *optval,
 280                       int *optlen);
 281 int kernel_setsockopt(struct socket *sock, int level, int optname, char *optval,
 282                       unsigned int optlen);
 283 int kernel_sendpage(struct socket *sock, struct page *page, int offset,
 284                     size_t size, int flags);
 285 int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg);
 286 int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how);
 287
 288 #define MODULE_ALIAS_NETPROTO(proto) \
 289         MODULE_ALIAS("net-pf-" __stringify(proto))
 290
 291 #define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \
 292         MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto))
 293
 294 #define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \
 295         MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
 296                      "-type-" __stringify(type))
 297
 298 #define MODULE_ALIAS_NET_PF_PROTO_NAME(pf, proto, name) \
 299         MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
 300                      name)
 301 #endif  /* _LINUX_NET_H */