/* * NET An implementation of the SOCKET network access protocol. * This is the master header file for the Linux NET layer, * or, in plain English: the networking handling part of the * kernel. * * Version: @(#)net.h 1.0.3 05/25/93 * * Authors: Orest Zborowski, * Ross Biro * Fred N. van Kempen, * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #ifndef _LINUX_NET_H #define _LINUX_NET_H #include #include #include #include /* For O_CLOEXEC and O_NONBLOCK */ #include #include #include #include #include struct poll_table_struct; struct pipe_inode_info; struct inode; struct file; struct net; /* Historically, SOCKWQ_ASYNC_NOSPACE & SOCKWQ_ASYNC_WAITDATA were located * in sock->flags, but moved into sk->sk_wq->flags to be RCU protected. * Eventually all flags will be in sk->sk_wq_flags. */ #define SOCKWQ_ASYNC_NOSPACE 0 #define SOCKWQ_ASYNC_WAITDATA 1 #define SOCK_NOSPACE 2 #define SOCK_PASSCRED 3 #define SOCK_PASSSEC 4 #ifndef ARCH_HAS_SOCKET_TYPES /** * enum sock_type - Socket types * @SOCK_STREAM: stream (connection) socket * @SOCK_DGRAM: datagram (conn.less) socket * @SOCK_RAW: raw socket * @SOCK_RDM: reliably-delivered message * @SOCK_SEQPACKET: sequential packet socket * @SOCK_DCCP: Datagram Congestion Control Protocol socket * @SOCK_PACKET: linux specific way of getting packets at the dev level. * For writing rarp and other similar things on the user level. * * When adding some new socket type please * grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS * overrides this enum for binary compat reasons. */ enum sock_type { SOCK_STREAM = 1, SOCK_DGRAM = 2, SOCK_RAW = 3, SOCK_RDM = 4, SOCK_SEQPACKET = 5, SOCK_DCCP = 6, SOCK_PACKET = 10, }; #define SOCK_MAX (SOCK_PACKET + 1) /* Mask which covers at least up to SOCK_MASK-1. The * remaining bits are used as flags. */ #define SOCK_TYPE_MASK 0xf /* Flags for socket, socketpair, accept4 */ #define SOCK_CLOEXEC O_CLOEXEC #ifndef SOCK_NONBLOCK #define SOCK_NONBLOCK O_NONBLOCK #endif #endif /* ARCH_HAS_SOCKET_TYPES */ enum sock_shutdown_cmd { SHUT_RD, SHUT_WR, SHUT_RDWR, }; struct socket_wq { /* Note: wait MUST be first field of socket_wq */ wait_queue_head_t wait; struct fasync_struct *fasync_list; unsigned long flags; /* %SOCKWQ_ASYNC_NOSPACE, etc */ struct rcu_head rcu; } ____cacheline_aligned_in_smp; /** * struct socket - general BSD socket * @state: socket state (%SS_CONNECTED, etc) * @type: socket type (%SOCK_STREAM, etc) * @flags: socket flags (%SOCK_NOSPACE, etc) * @ops: protocol specific socket operations * @file: File back pointer for gc * @sk: internal networking protocol agnostic socket representation * @wq: wait queue for several uses */ struct socket { socket_state state; kmemcheck_bitfield_begin(type); short type; kmemcheck_bitfield_end(type); unsigned long flags; struct socket_wq __rcu *wq; struct file *file; struct sock *sk; const struct proto_ops *ops; }; struct vm_area_struct; struct page; struct sockaddr; struct msghdr; struct module; struct sk_buff; typedef int (*sk_read_actor_t)(read_descriptor_t *, struct sk_buff *, unsigned int, size_t); struct proto_ops { int family; struct module *owner; int (*release) (struct socket *sock); int (*bind) (struct socket *sock, struct sockaddr *myaddr, int sockaddr_len); int (*connect) (struct socket *sock, struct sockaddr *vaddr, int sockaddr_len, int flags); int (*socketpair)(struct socket *sock1, struct socket *sock2); int (*accept) (struct socket *sock, struct socket *newsock, int flags); int (*getname) (struct socket *sock, struct sockaddr *addr, int *sockaddr_len, int peer); unsigned int (*poll) (struct file *file, struct socket *sock, struct poll_table_struct *wait); int (*ioctl) (struct socket *sock, unsigned int cmd, unsigned long arg); #ifdef CONFIG_COMPAT int (*compat_ioctl) (struct socket *sock, unsigned int cmd, unsigned long arg); #endif int (*listen) (struct socket *sock, int len); int (*shutdown) (struct socket *sock, int flags); int (*setsockopt)(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen); int (*getsockopt)(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen); #ifdef CONFIG_COMPAT int (*compat_setsockopt)(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen); int (*compat_getsockopt)(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen); #endif int (*sendmsg) (struct socket *sock, struct msghdr *m, size_t total_len); /* Notes for implementing recvmsg: * =============================== * msg->msg_namelen should get updated by the recvmsg handlers * iff msg_name != NULL. It is by default 0 to prevent * returning uninitialized memory to user space. The recvfrom * handlers can assume that msg.msg_name is either NULL or has * a minimum size of sizeof(struct sockaddr_storage). */ int (*recvmsg) (struct socket *sock, struct msghdr *m, size_t total_len, int flags); int (*mmap) (struct file *file, struct socket *sock, struct vm_area_struct * vma); ssize_t (*sendpage) (struct socket *sock, struct page *page, int offset, size_t size, int flags); ssize_t (*splice_read)(struct socket *sock, loff_t *ppos, struct pipe_inode_info *pipe, size_t len, unsigned int flags); int (*set_peek_off)(struct sock *sk, int val); int (*peek_len)(struct socket *sock); int (*read_sock)(struct sock *sk, read_descriptor_t *desc, sk_read_actor_t recv_actor); }; #define DECLARE_SOCKADDR(type, dst, src) \ type dst = ({ __sockaddr_check_size(sizeof(*dst)); (type) src; }) struct net_proto_family { int family; int (*create)(struct net *net, struct socket *sock, int protocol, int kern); struct module *owner; }; struct iovec; struct kvec; enum { SOCK_WAKE_IO, SOCK_WAKE_WAITD, SOCK_WAKE_SPACE, SOCK_WAKE_URG, }; int sock_wake_async(struct socket_wq *sk_wq, int how, int band); int sock_register(const struct net_proto_family *fam); void sock_unregister(int family); int __sock_create(struct net *net, int family, int type, int proto, struct socket **res, int kern); int sock_create(int family, int type, int proto, struct socket **res); int sock_create_kern(struct net *net, int family, int type, int proto, struct socket **res); int sock_create_lite(int family, int type, int proto, struct socket **res); struct socket *sock_alloc(void); void sock_release(struct socket *sock); int sock_sendmsg(struct socket *sock, struct msghdr *msg); int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags); struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname); struct socket *sockfd_lookup(int fd, int *err); struct socket *sock_from_file(struct file *file, int *err); #define sockfd_put(sock) fput(sock->file) int net_ratelimit(void); #define net_ratelimited_function(function, ...) \ do { \ if (net_ratelimit()) \ function(__VA_ARGS__); \ } while (0) #define net_emerg_ratelimited(fmt, ...) \ net_ratelimited_function(pr_emerg, fmt, ##__VA_ARGS__) #define net_alert_ratelimited(fmt, ...) \ net_ratelimited_function(pr_alert, fmt, ##__VA_ARGS__) #define net_crit_ratelimited(fmt, ...) \ net_ratelimited_function(pr_crit, fmt, ##__VA_ARGS__) #define net_err_ratelimited(fmt, ...) \ net_ratelimited_function(pr_err, fmt, ##__VA_ARGS__) #define net_notice_ratelimited(fmt, ...) \ net_ratelimited_function(pr_notice, fmt, ##__VA_ARGS__) #define net_warn_ratelimited(fmt, ...) \ net_ratelimited_function(pr_warn, fmt, ##__VA_ARGS__) #define net_info_ratelimited(fmt, ...) \ net_ratelimited_function(pr_info, fmt, ##__VA_ARGS__) #if defined(CONFIG_DYNAMIC_DEBUG) #define net_dbg_ratelimited(fmt, ...) \ do { \ DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \ if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) && \ net_ratelimit()) \ __dynamic_pr_debug(&descriptor, pr_fmt(fmt), \ ##__VA_ARGS__); \ } while (0) #elif defined(DEBUG) #define net_dbg_ratelimited(fmt, ...) \ net_ratelimited_function(pr_debug, fmt, ##__VA_ARGS__) #else #define net_dbg_ratelimited(fmt, ...) \ do { \ if (0) \ no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \ } while (0) #endif #define net_get_random_once(buf, nbytes) \ get_random_once((buf), (nbytes)) #define net_get_random_once_wait(buf, nbytes) \ get_random_once_wait((buf), (nbytes)) int kernel_sendmsg(struct socket *sock, struct msghdr *msg, struct kvec *vec, size_t num, size_t len); int kernel_recvmsg(struct socket *sock, struct msghdr *msg, struct kvec *vec, size_t num, size_t len, int flags); int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen); int kernel_listen(struct socket *sock, int backlog); int kernel_accept(struct socket *sock, struct socket **newsock, int flags); int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, int flags); int kernel_getsockname(struct socket *sock, struct sockaddr *addr, int *addrlen); int kernel_getpeername(struct socket *sock, struct sockaddr *addr, int *addrlen); int kernel_getsockopt(struct socket *sock, int level, int optname, char *optval, int *optlen); int kernel_setsockopt(struct socket *sock, int level, int optname, char *optval, unsigned int optlen); int kernel_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags); int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg); int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how); /* Routine returns the IP overhead imposed by a (caller-protected) socket. */ u32 kernel_sock_ip_overhead(struct sock *sk); #define MODULE_ALIAS_NETPROTO(proto) \ MODULE_ALIAS("net-pf-" __stringify(proto)) #define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \ MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto)) #define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \ MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \ "-type-" __stringify(type)) #define MODULE_ALIAS_NET_PF_PROTO_NAME(pf, proto, name) \ MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \ name) #endif /* _LINUX_NET_H */