diff options
Diffstat (limited to 'include/linux/net.h')
| -rw-r--r-- | include/linux/net.h | 268 |
1 files changed, 177 insertions, 91 deletions
diff --git a/include/linux/net.h b/include/linux/net.h index 4f27575ce1d6..f58b38ab37f8 100644 --- a/include/linux/net.h +++ b/include/linux/net.h @@ -1,3 +1,4 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * NET An implementation of the SOCKET network access protocol. * This is the master header file for the Linux NET layer, @@ -9,11 +10,6 @@ * Authors: Orest Zborowski, <obz@Kodak.COM> * Ross Biro * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> - * - * 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 @@ -22,8 +18,12 @@ #include <linux/random.h> #include <linux/wait.h> #include <linux/fcntl.h> /* For O_CLOEXEC and O_NONBLOCK */ -#include <linux/kmemcheck.h> #include <linux/rcupdate.h> +#include <linux/once.h> +#include <linux/fs.h> +#include <linux/mm.h> +#include <linux/sockptr.h> + #include <uapi/linux/net.h> struct poll_table_struct; @@ -32,12 +32,17 @@ struct inode; struct file; struct net; -#define SOCK_ASYNC_NOSPACE 0 -#define SOCK_ASYNC_WAITDATA 1 -#define SOCK_NOSPACE 2 -#define SOCK_PASSCRED 3 -#define SOCK_PASSSEC 4 -#define SOCK_EXTERNALLY_ALLOCATED 5 +/* 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. + */ +enum socket_flags { + SOCKWQ_ASYNC_NOSPACE, + SOCKWQ_ASYNC_WAITDATA, + SOCK_NOSPACE, + SOCK_SUPPORT_ZC, + SOCK_CUSTOM_SOCKOPT, +}; #ifndef ARCH_HAS_SOCKET_TYPES /** @@ -64,6 +69,7 @@ enum sock_type { SOCK_DCCP = 6, SOCK_PACKET = 10, }; +#endif /* ARCH_HAS_SOCKET_TYPES */ #define SOCK_MAX (SOCK_PACKET + 1) /* Mask which covers at least up to SOCK_MASK-1. The @@ -75,9 +81,14 @@ enum sock_type { #ifndef SOCK_NONBLOCK #define SOCK_NONBLOCK O_NONBLOCK #endif +#define SOCK_COREDUMP O_NOCTTY -#endif /* ARCH_HAS_SOCKET_TYPES */ - +/** + * enum sock_shutdown_cmd - Shutdown types + * @SHUT_RD: shutdown receptions + * @SHUT_WR: shutdown transmissions + * @SHUT_RDWR: shutdown receptions/transmissions + */ enum sock_shutdown_cmd { SHUT_RD, SHUT_WR, @@ -88,6 +99,7 @@ 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; @@ -95,7 +107,7 @@ struct socket_wq { * struct socket - general BSD socket * @state: socket state (%SS_CONNECTED, etc) * @type: socket type (%SOCK_STREAM, etc) - * @flags: socket flags (%SOCK_ASYNC_NOSPACE, 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 @@ -104,44 +116,66 @@ struct socket_wq { 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; + const struct proto_ops *ops; /* Might change with IPV6_ADDRFORM or MPTCP. */ + + struct socket_wq wq; }; +/* + * "descriptor" for what we're up to with a read. + * This allows us to use the same read code yet + * have multiple different users of the data that + * we read from a file. + * + * The simplest case just copies the data to user + * mode. + */ +typedef struct { + size_t written; + size_t count; + union { + char __user *buf; + void *data; + } arg; + int error; +} read_descriptor_t; + struct vm_area_struct; struct page; -struct kiocb; -struct sockaddr; struct msghdr; struct module; +struct sk_buff; +struct proto_accept_arg; +typedef int (*sk_read_actor_t)(read_descriptor_t *, struct sk_buff *, + unsigned int, size_t); +typedef int (*skb_read_actor_t)(struct sock *, struct sk_buff *); + struct proto_ops { int family; struct module *owner; int (*release) (struct socket *sock); int (*bind) (struct socket *sock, - struct sockaddr *myaddr, + struct sockaddr_unsized *myaddr, int sockaddr_len); int (*connect) (struct socket *sock, - struct sockaddr *vaddr, + struct sockaddr_unsized *vaddr, int sockaddr_len, int flags); int (*socketpair)(struct socket *sock1, struct socket *sock2); int (*accept) (struct socket *sock, - struct socket *newsock, int flags); + struct socket *newsock, + struct proto_accept_arg *arg); int (*getname) (struct socket *sock, struct sockaddr *addr, - int *sockaddr_len, int peer); - unsigned int (*poll) (struct file *file, struct socket *sock, + int peer); + __poll_t (*poll) (struct file *file, struct socket *sock, struct poll_table_struct *wait); int (*ioctl) (struct socket *sock, unsigned int cmd, unsigned long arg); @@ -149,30 +183,46 @@ struct proto_ops { int (*compat_ioctl) (struct socket *sock, unsigned int cmd, unsigned long arg); #endif + int (*gettstamp) (struct socket *sock, void __user *userstamp, + bool timeval, bool time32); 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 optname, sockptr_t 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 kiocb *iocb, struct socket *sock, - struct msghdr *m, size_t total_len); - int (*recvmsg) (struct kiocb *iocb, struct socket *sock, - struct msghdr *m, size_t total_len, - int flags); + void (*show_fdinfo)(struct seq_file *m, struct socket *sock); + 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); - void (*set_peek_off)(struct sock *sk, int val); + void (*splice_eof)(struct socket *sock); + int (*set_peek_off)(struct sock *sk, int val); + int (*peek_len)(struct socket *sock); + + /* The following functions are called internally by kernel with + * sock lock already held. + */ + int (*read_sock)(struct sock *sk, read_descriptor_t *desc, + sk_read_actor_t recv_actor); + /* This is different from read_sock(), it reads an entire skb at a time. */ + int (*read_skb)(struct sock *sk, skb_read_actor_t recv_actor); + int (*sendmsg_locked)(struct sock *sk, struct msghdr *msg, + size_t size); + int (*set_rcvlowat)(struct sock *sk, int val); }; #define DECLARE_SOCKADDR(type, dst, src) \ @@ -195,27 +245,24 @@ enum { SOCK_WAKE_URG, }; -extern int sock_wake_async(struct socket *sk, int how, int band); -extern int sock_register(const struct net_proto_family *fam); -extern void sock_unregister(int family); -extern int __sock_create(struct net *net, int family, int type, int proto, - struct socket **res, int kern); -extern int sock_create(int family, int type, int proto, - struct socket **res); -extern int sock_create_kern(int family, int type, int proto, - struct socket **res); -extern int sock_create_lite(int family, int type, int proto, - struct socket **res); -extern void sock_release(struct socket *sock); -extern int sock_sendmsg(struct socket *sock, struct msghdr *msg, - size_t len); -extern int sock_recvmsg(struct socket *sock, struct msghdr *msg, - size_t size, int flags); -extern struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname); -extern struct socket *sockfd_lookup(int fd, int *err); -extern struct socket *sock_from_file(struct file *file, int *err); +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); +bool sock_is_registered(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); #define sockfd_put(sock) fput(sock->file) -extern int net_ratelimit(void); +int net_ratelimit(void); #define net_ratelimited_function(function, ...) \ do { \ @@ -237,38 +284,77 @@ do { \ 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) || \ + (defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE)) +#define net_dbg_ratelimited(fmt, ...) \ +do { \ + DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \ + if (DYNAMIC_DEBUG_BRANCH(descriptor) && \ + 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, ...) \ + no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) +#endif + +#define net_get_random_once(buf, nbytes) \ + get_random_once((buf), (nbytes)) + +/* + * E.g. XFS meta- & log-data is in slab pages, or bcache meta + * data pages, or other high order pages allocated by + * __get_free_pages() without __GFP_COMP, which have a page_count + * of 0 and/or have PageSlab() set. We cannot use send_page for + * those, as that does get_page(); put_page(); and would cause + * either a VM_BUG directly, or __page_cache_release a page that + * would actually still be referenced by someone, leading to some + * obscure delayed Oops somewhere else. + */ +static inline bool sendpage_ok(struct page *page) +{ + return !PageSlab(page) && page_count(page) >= 1; +} + +/* + * Check sendpage_ok on contiguous pages. + */ +static inline bool sendpages_ok(struct page *page, size_t len, size_t offset) +{ + struct page *p = page + (offset >> PAGE_SHIFT); + size_t count = 0; + + while (count < len) { + if (!sendpage_ok(p)) + return false; + + p++; + count += PAGE_SIZE; + } + + return true; +} + +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_unsized *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_unsized *addr, int addrlen, + int flags); +int kernel_getsockname(struct socket *sock, struct sockaddr *addr); +int kernel_getpeername(struct socket *sock, struct sockaddr *addr); +int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how); -#define net_random() prandom_u32() -#define net_srandom(seed) prandom_seed((__force u32)(seed)) - -extern int kernel_sendmsg(struct socket *sock, struct msghdr *msg, - struct kvec *vec, size_t num, size_t len); -extern int kernel_recvmsg(struct socket *sock, struct msghdr *msg, - struct kvec *vec, size_t num, - size_t len, int flags); - -extern int kernel_bind(struct socket *sock, struct sockaddr *addr, - int addrlen); -extern int kernel_listen(struct socket *sock, int backlog); -extern int kernel_accept(struct socket *sock, struct socket **newsock, - int flags); -extern int kernel_connect(struct socket *sock, struct sockaddr *addr, - int addrlen, int flags); -extern int kernel_getsockname(struct socket *sock, struct sockaddr *addr, - int *addrlen); -extern int kernel_getpeername(struct socket *sock, struct sockaddr *addr, - int *addrlen); -extern int kernel_getsockopt(struct socket *sock, int level, int optname, - char *optval, int *optlen); -extern int kernel_setsockopt(struct socket *sock, int level, int optname, - char *optval, unsigned int optlen); -extern int kernel_sendpage(struct socket *sock, struct page *page, int offset, - size_t size, int flags); -extern int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg); -extern 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)) |