mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 10:26:42 +07:00
4bcff1b37e
I cunningly put the audit call immediately after the copy_from_user().... but used the _userspace_ copy of the args still. Let's not do that. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2094 lines
49 KiB
C
2094 lines
49 KiB
C
/*
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* NET An implementation of the SOCKET network access protocol.
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*
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* Version: @(#)socket.c 1.1.93 18/02/95
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*
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* Authors: Orest Zborowski, <obz@Kodak.COM>
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* Ross Biro
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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*
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* Fixes:
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* Anonymous : NOTSOCK/BADF cleanup. Error fix in
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* shutdown()
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* Alan Cox : verify_area() fixes
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* Alan Cox : Removed DDI
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* Jonathan Kamens : SOCK_DGRAM reconnect bug
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* Alan Cox : Moved a load of checks to the very
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* top level.
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* Alan Cox : Move address structures to/from user
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* mode above the protocol layers.
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* Rob Janssen : Allow 0 length sends.
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* Alan Cox : Asynchronous I/O support (cribbed from the
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* tty drivers).
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* Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style)
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* Jeff Uphoff : Made max number of sockets command-line
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* configurable.
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* Matti Aarnio : Made the number of sockets dynamic,
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* to be allocated when needed, and mr.
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* Uphoff's max is used as max to be
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* allowed to allocate.
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* Linus : Argh. removed all the socket allocation
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* altogether: it's in the inode now.
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* Alan Cox : Made sock_alloc()/sock_release() public
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* for NetROM and future kernel nfsd type
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* stuff.
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* Alan Cox : sendmsg/recvmsg basics.
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* Tom Dyas : Export net symbols.
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* Marcin Dalecki : Fixed problems with CONFIG_NET="n".
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* Alan Cox : Added thread locking to sys_* calls
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* for sockets. May have errors at the
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* moment.
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* Kevin Buhr : Fixed the dumb errors in the above.
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* Andi Kleen : Some small cleanups, optimizations,
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* and fixed a copy_from_user() bug.
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* Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0)
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* Tigran Aivazian : Made listen(2) backlog sanity checks
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* protocol-independent
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*
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* This module is effectively the top level interface to the BSD socket
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* paradigm.
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*
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* Based upon Swansea University Computer Society NET3.039
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*/
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#include <linux/config.h>
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#include <linux/mm.h>
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#include <linux/smp_lock.h>
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#include <linux/socket.h>
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#include <linux/file.h>
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#include <linux/net.h>
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#include <linux/interrupt.h>
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#include <linux/netdevice.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/wanrouter.h>
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#include <linux/if_bridge.h>
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#include <linux/init.h>
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#include <linux/poll.h>
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#include <linux/cache.h>
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#include <linux/module.h>
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#include <linux/highmem.h>
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#include <linux/divert.h>
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#include <linux/mount.h>
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#include <linux/security.h>
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#include <linux/syscalls.h>
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#include <linux/compat.h>
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#include <linux/kmod.h>
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#include <linux/audit.h>
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#ifdef CONFIG_NET_RADIO
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#include <linux/wireless.h> /* Note : will define WIRELESS_EXT */
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#endif /* CONFIG_NET_RADIO */
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#include <asm/uaccess.h>
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#include <asm/unistd.h>
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#include <net/compat.h>
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#include <net/sock.h>
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#include <linux/netfilter.h>
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static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
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static ssize_t sock_aio_read(struct kiocb *iocb, char __user *buf,
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size_t size, loff_t pos);
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static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *buf,
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size_t size, loff_t pos);
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static int sock_mmap(struct file *file, struct vm_area_struct * vma);
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static int sock_close(struct inode *inode, struct file *file);
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static unsigned int sock_poll(struct file *file,
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struct poll_table_struct *wait);
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static long sock_ioctl(struct file *file,
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unsigned int cmd, unsigned long arg);
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static int sock_fasync(int fd, struct file *filp, int on);
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static ssize_t sock_readv(struct file *file, const struct iovec *vector,
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unsigned long count, loff_t *ppos);
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static ssize_t sock_writev(struct file *file, const struct iovec *vector,
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unsigned long count, loff_t *ppos);
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static ssize_t sock_sendpage(struct file *file, struct page *page,
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int offset, size_t size, loff_t *ppos, int more);
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/*
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* Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
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* in the operation structures but are done directly via the socketcall() multiplexor.
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*/
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static struct file_operations socket_file_ops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.aio_read = sock_aio_read,
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.aio_write = sock_aio_write,
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.poll = sock_poll,
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.unlocked_ioctl = sock_ioctl,
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.mmap = sock_mmap,
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.open = sock_no_open, /* special open code to disallow open via /proc */
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.release = sock_close,
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.fasync = sock_fasync,
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.readv = sock_readv,
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.writev = sock_writev,
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.sendpage = sock_sendpage
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};
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/*
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* The protocol list. Each protocol is registered in here.
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*/
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static struct net_proto_family *net_families[NPROTO];
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#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT)
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static atomic_t net_family_lockct = ATOMIC_INIT(0);
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static DEFINE_SPINLOCK(net_family_lock);
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/* The strategy is: modifications net_family vector are short, do not
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sleep and veeery rare, but read access should be free of any exclusive
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locks.
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*/
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static void net_family_write_lock(void)
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{
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spin_lock(&net_family_lock);
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while (atomic_read(&net_family_lockct) != 0) {
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spin_unlock(&net_family_lock);
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yield();
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spin_lock(&net_family_lock);
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}
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}
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static __inline__ void net_family_write_unlock(void)
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{
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spin_unlock(&net_family_lock);
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}
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static __inline__ void net_family_read_lock(void)
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{
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atomic_inc(&net_family_lockct);
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spin_unlock_wait(&net_family_lock);
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}
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static __inline__ void net_family_read_unlock(void)
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{
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atomic_dec(&net_family_lockct);
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}
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#else
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#define net_family_write_lock() do { } while(0)
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#define net_family_write_unlock() do { } while(0)
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#define net_family_read_lock() do { } while(0)
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#define net_family_read_unlock() do { } while(0)
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#endif
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/*
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* Statistics counters of the socket lists
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*/
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static DEFINE_PER_CPU(int, sockets_in_use) = 0;
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/*
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* Support routines. Move socket addresses back and forth across the kernel/user
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* divide and look after the messy bits.
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*/
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#define MAX_SOCK_ADDR 128 /* 108 for Unix domain -
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16 for IP, 16 for IPX,
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24 for IPv6,
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about 80 for AX.25
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must be at least one bigger than
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the AF_UNIX size (see net/unix/af_unix.c
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:unix_mkname()).
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*/
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/**
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* move_addr_to_kernel - copy a socket address into kernel space
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* @uaddr: Address in user space
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* @kaddr: Address in kernel space
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* @ulen: Length in user space
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*
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* The address is copied into kernel space. If the provided address is
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* too long an error code of -EINVAL is returned. If the copy gives
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* invalid addresses -EFAULT is returned. On a success 0 is returned.
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*/
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int move_addr_to_kernel(void __user *uaddr, int ulen, void *kaddr)
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{
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if(ulen<0||ulen>MAX_SOCK_ADDR)
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return -EINVAL;
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if(ulen==0)
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return 0;
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if(copy_from_user(kaddr,uaddr,ulen))
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return -EFAULT;
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return audit_sockaddr(ulen, kaddr);
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}
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/**
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* move_addr_to_user - copy an address to user space
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* @kaddr: kernel space address
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* @klen: length of address in kernel
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* @uaddr: user space address
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* @ulen: pointer to user length field
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*
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* The value pointed to by ulen on entry is the buffer length available.
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* This is overwritten with the buffer space used. -EINVAL is returned
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* if an overlong buffer is specified or a negative buffer size. -EFAULT
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* is returned if either the buffer or the length field are not
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* accessible.
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* After copying the data up to the limit the user specifies, the true
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* length of the data is written over the length limit the user
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* specified. Zero is returned for a success.
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*/
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int move_addr_to_user(void *kaddr, int klen, void __user *uaddr, int __user *ulen)
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{
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int err;
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int len;
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if((err=get_user(len, ulen)))
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return err;
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if(len>klen)
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len=klen;
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if(len<0 || len> MAX_SOCK_ADDR)
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return -EINVAL;
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if(len)
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{
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if(copy_to_user(uaddr,kaddr,len))
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return -EFAULT;
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}
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/*
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* "fromlen shall refer to the value before truncation.."
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* 1003.1g
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*/
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return __put_user(klen, ulen);
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}
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#define SOCKFS_MAGIC 0x534F434B
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static kmem_cache_t * sock_inode_cachep;
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static struct inode *sock_alloc_inode(struct super_block *sb)
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{
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struct socket_alloc *ei;
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ei = (struct socket_alloc *)kmem_cache_alloc(sock_inode_cachep, SLAB_KERNEL);
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if (!ei)
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return NULL;
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init_waitqueue_head(&ei->socket.wait);
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ei->socket.fasync_list = NULL;
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ei->socket.state = SS_UNCONNECTED;
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ei->socket.flags = 0;
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ei->socket.ops = NULL;
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ei->socket.sk = NULL;
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ei->socket.file = NULL;
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ei->socket.flags = 0;
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return &ei->vfs_inode;
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}
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static void sock_destroy_inode(struct inode *inode)
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{
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kmem_cache_free(sock_inode_cachep,
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container_of(inode, struct socket_alloc, vfs_inode));
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}
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static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
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{
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struct socket_alloc *ei = (struct socket_alloc *) foo;
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if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
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SLAB_CTOR_CONSTRUCTOR)
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inode_init_once(&ei->vfs_inode);
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}
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static int init_inodecache(void)
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{
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sock_inode_cachep = kmem_cache_create("sock_inode_cache",
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sizeof(struct socket_alloc),
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0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT,
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init_once, NULL);
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if (sock_inode_cachep == NULL)
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return -ENOMEM;
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return 0;
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}
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static struct super_operations sockfs_ops = {
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.alloc_inode = sock_alloc_inode,
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.destroy_inode =sock_destroy_inode,
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.statfs = simple_statfs,
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};
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static struct super_block *sockfs_get_sb(struct file_system_type *fs_type,
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int flags, const char *dev_name, void *data)
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{
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return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC);
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}
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static struct vfsmount *sock_mnt;
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static struct file_system_type sock_fs_type = {
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.name = "sockfs",
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.get_sb = sockfs_get_sb,
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.kill_sb = kill_anon_super,
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};
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static int sockfs_delete_dentry(struct dentry *dentry)
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{
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return 1;
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}
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static struct dentry_operations sockfs_dentry_operations = {
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.d_delete = sockfs_delete_dentry,
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};
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/*
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* Obtains the first available file descriptor and sets it up for use.
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*
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* This function creates file structure and maps it to fd space
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* of current process. On success it returns file descriptor
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* and file struct implicitly stored in sock->file.
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* Note that another thread may close file descriptor before we return
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* from this function. We use the fact that now we do not refer
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* to socket after mapping. If one day we will need it, this
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* function will increment ref. count on file by 1.
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*
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* In any case returned fd MAY BE not valid!
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* This race condition is unavoidable
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* with shared fd spaces, we cannot solve it inside kernel,
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* but we take care of internal coherence yet.
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*/
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int sock_map_fd(struct socket *sock)
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{
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int fd;
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struct qstr this;
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char name[32];
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/*
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* Find a file descriptor suitable for return to the user.
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*/
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fd = get_unused_fd();
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if (fd >= 0) {
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struct file *file = get_empty_filp();
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if (!file) {
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put_unused_fd(fd);
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fd = -ENFILE;
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goto out;
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}
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sprintf(name, "[%lu]", SOCK_INODE(sock)->i_ino);
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this.name = name;
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this.len = strlen(name);
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this.hash = SOCK_INODE(sock)->i_ino;
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file->f_dentry = d_alloc(sock_mnt->mnt_sb->s_root, &this);
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if (!file->f_dentry) {
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put_filp(file);
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put_unused_fd(fd);
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fd = -ENOMEM;
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goto out;
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}
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file->f_dentry->d_op = &sockfs_dentry_operations;
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d_add(file->f_dentry, SOCK_INODE(sock));
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file->f_vfsmnt = mntget(sock_mnt);
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file->f_mapping = file->f_dentry->d_inode->i_mapping;
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sock->file = file;
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file->f_op = SOCK_INODE(sock)->i_fop = &socket_file_ops;
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file->f_mode = FMODE_READ | FMODE_WRITE;
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file->f_flags = O_RDWR;
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file->f_pos = 0;
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fd_install(fd, file);
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}
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out:
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return fd;
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}
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|
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/**
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* sockfd_lookup - Go from a file number to its socket slot
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* @fd: file handle
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* @err: pointer to an error code return
|
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*
|
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* The file handle passed in is locked and the socket it is bound
|
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* too is returned. If an error occurs the err pointer is overwritten
|
|
* with a negative errno code and NULL is returned. The function checks
|
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* for both invalid handles and passing a handle which is not a socket.
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*
|
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* On a success the socket object pointer is returned.
|
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*/
|
|
|
|
struct socket *sockfd_lookup(int fd, int *err)
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{
|
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struct file *file;
|
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struct inode *inode;
|
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struct socket *sock;
|
|
|
|
if (!(file = fget(fd)))
|
|
{
|
|
*err = -EBADF;
|
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return NULL;
|
|
}
|
|
|
|
inode = file->f_dentry->d_inode;
|
|
if (!S_ISSOCK(inode->i_mode)) {
|
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*err = -ENOTSOCK;
|
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fput(file);
|
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return NULL;
|
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}
|
|
|
|
sock = SOCKET_I(inode);
|
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if (sock->file != file) {
|
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printk(KERN_ERR "socki_lookup: socket file changed!\n");
|
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sock->file = file;
|
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}
|
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return sock;
|
|
}
|
|
|
|
/**
|
|
* sock_alloc - allocate a socket
|
|
*
|
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* Allocate a new inode and socket object. The two are bound together
|
|
* and initialised. The socket is then returned. If we are out of inodes
|
|
* NULL is returned.
|
|
*/
|
|
|
|
static struct socket *sock_alloc(void)
|
|
{
|
|
struct inode * inode;
|
|
struct socket * sock;
|
|
|
|
inode = new_inode(sock_mnt->mnt_sb);
|
|
if (!inode)
|
|
return NULL;
|
|
|
|
sock = SOCKET_I(inode);
|
|
|
|
inode->i_mode = S_IFSOCK|S_IRWXUGO;
|
|
inode->i_uid = current->fsuid;
|
|
inode->i_gid = current->fsgid;
|
|
|
|
get_cpu_var(sockets_in_use)++;
|
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put_cpu_var(sockets_in_use);
|
|
return sock;
|
|
}
|
|
|
|
/*
|
|
* In theory you can't get an open on this inode, but /proc provides
|
|
* a back door. Remember to keep it shut otherwise you'll let the
|
|
* creepy crawlies in.
|
|
*/
|
|
|
|
static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
|
|
{
|
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return -ENXIO;
|
|
}
|
|
|
|
struct file_operations bad_sock_fops = {
|
|
.owner = THIS_MODULE,
|
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.open = sock_no_open,
|
|
};
|
|
|
|
/**
|
|
* sock_release - close a socket
|
|
* @sock: socket to close
|
|
*
|
|
* The socket is released from the protocol stack if it has a release
|
|
* callback, and the inode is then released if the socket is bound to
|
|
* an inode not a file.
|
|
*/
|
|
|
|
void sock_release(struct socket *sock)
|
|
{
|
|
if (sock->ops) {
|
|
struct module *owner = sock->ops->owner;
|
|
|
|
sock->ops->release(sock);
|
|
sock->ops = NULL;
|
|
module_put(owner);
|
|
}
|
|
|
|
if (sock->fasync_list)
|
|
printk(KERN_ERR "sock_release: fasync list not empty!\n");
|
|
|
|
get_cpu_var(sockets_in_use)--;
|
|
put_cpu_var(sockets_in_use);
|
|
if (!sock->file) {
|
|
iput(SOCK_INODE(sock));
|
|
return;
|
|
}
|
|
sock->file=NULL;
|
|
}
|
|
|
|
static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
|
|
struct msghdr *msg, size_t size)
|
|
{
|
|
struct sock_iocb *si = kiocb_to_siocb(iocb);
|
|
int err;
|
|
|
|
si->sock = sock;
|
|
si->scm = NULL;
|
|
si->msg = msg;
|
|
si->size = size;
|
|
|
|
err = security_socket_sendmsg(sock, msg, size);
|
|
if (err)
|
|
return err;
|
|
|
|
return sock->ops->sendmsg(iocb, sock, msg, size);
|
|
}
|
|
|
|
int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
|
|
{
|
|
struct kiocb iocb;
|
|
struct sock_iocb siocb;
|
|
int ret;
|
|
|
|
init_sync_kiocb(&iocb, NULL);
|
|
iocb.private = &siocb;
|
|
ret = __sock_sendmsg(&iocb, sock, msg, size);
|
|
if (-EIOCBQUEUED == ret)
|
|
ret = wait_on_sync_kiocb(&iocb);
|
|
return ret;
|
|
}
|
|
|
|
int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
|
|
struct kvec *vec, size_t num, size_t size)
|
|
{
|
|
mm_segment_t oldfs = get_fs();
|
|
int result;
|
|
|
|
set_fs(KERNEL_DS);
|
|
/*
|
|
* the following is safe, since for compiler definitions of kvec and
|
|
* iovec are identical, yielding the same in-core layout and alignment
|
|
*/
|
|
msg->msg_iov = (struct iovec *)vec,
|
|
msg->msg_iovlen = num;
|
|
result = sock_sendmsg(sock, msg, size);
|
|
set_fs(oldfs);
|
|
return result;
|
|
}
|
|
|
|
static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
|
|
struct msghdr *msg, size_t size, int flags)
|
|
{
|
|
int err;
|
|
struct sock_iocb *si = kiocb_to_siocb(iocb);
|
|
|
|
si->sock = sock;
|
|
si->scm = NULL;
|
|
si->msg = msg;
|
|
si->size = size;
|
|
si->flags = flags;
|
|
|
|
err = security_socket_recvmsg(sock, msg, size, flags);
|
|
if (err)
|
|
return err;
|
|
|
|
return sock->ops->recvmsg(iocb, sock, msg, size, flags);
|
|
}
|
|
|
|
int sock_recvmsg(struct socket *sock, struct msghdr *msg,
|
|
size_t size, int flags)
|
|
{
|
|
struct kiocb iocb;
|
|
struct sock_iocb siocb;
|
|
int ret;
|
|
|
|
init_sync_kiocb(&iocb, NULL);
|
|
iocb.private = &siocb;
|
|
ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
|
|
if (-EIOCBQUEUED == ret)
|
|
ret = wait_on_sync_kiocb(&iocb);
|
|
return ret;
|
|
}
|
|
|
|
int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
|
|
struct kvec *vec, size_t num,
|
|
size_t size, int flags)
|
|
{
|
|
mm_segment_t oldfs = get_fs();
|
|
int result;
|
|
|
|
set_fs(KERNEL_DS);
|
|
/*
|
|
* the following is safe, since for compiler definitions of kvec and
|
|
* iovec are identical, yielding the same in-core layout and alignment
|
|
*/
|
|
msg->msg_iov = (struct iovec *)vec,
|
|
msg->msg_iovlen = num;
|
|
result = sock_recvmsg(sock, msg, size, flags);
|
|
set_fs(oldfs);
|
|
return result;
|
|
}
|
|
|
|
static void sock_aio_dtor(struct kiocb *iocb)
|
|
{
|
|
kfree(iocb->private);
|
|
}
|
|
|
|
/*
|
|
* Read data from a socket. ubuf is a user mode pointer. We make sure the user
|
|
* area ubuf...ubuf+size-1 is writable before asking the protocol.
|
|
*/
|
|
|
|
static ssize_t sock_aio_read(struct kiocb *iocb, char __user *ubuf,
|
|
size_t size, loff_t pos)
|
|
{
|
|
struct sock_iocb *x, siocb;
|
|
struct socket *sock;
|
|
int flags;
|
|
|
|
if (pos != 0)
|
|
return -ESPIPE;
|
|
if (size==0) /* Match SYS5 behaviour */
|
|
return 0;
|
|
|
|
if (is_sync_kiocb(iocb))
|
|
x = &siocb;
|
|
else {
|
|
x = kmalloc(sizeof(struct sock_iocb), GFP_KERNEL);
|
|
if (!x)
|
|
return -ENOMEM;
|
|
iocb->ki_dtor = sock_aio_dtor;
|
|
}
|
|
iocb->private = x;
|
|
x->kiocb = iocb;
|
|
sock = SOCKET_I(iocb->ki_filp->f_dentry->d_inode);
|
|
|
|
x->async_msg.msg_name = NULL;
|
|
x->async_msg.msg_namelen = 0;
|
|
x->async_msg.msg_iov = &x->async_iov;
|
|
x->async_msg.msg_iovlen = 1;
|
|
x->async_msg.msg_control = NULL;
|
|
x->async_msg.msg_controllen = 0;
|
|
x->async_iov.iov_base = ubuf;
|
|
x->async_iov.iov_len = size;
|
|
flags = !(iocb->ki_filp->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
|
|
|
|
return __sock_recvmsg(iocb, sock, &x->async_msg, size, flags);
|
|
}
|
|
|
|
|
|
/*
|
|
* Write data to a socket. We verify that the user area ubuf..ubuf+size-1
|
|
* is readable by the user process.
|
|
*/
|
|
|
|
static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *ubuf,
|
|
size_t size, loff_t pos)
|
|
{
|
|
struct sock_iocb *x, siocb;
|
|
struct socket *sock;
|
|
|
|
if (pos != 0)
|
|
return -ESPIPE;
|
|
if(size==0) /* Match SYS5 behaviour */
|
|
return 0;
|
|
|
|
if (is_sync_kiocb(iocb))
|
|
x = &siocb;
|
|
else {
|
|
x = kmalloc(sizeof(struct sock_iocb), GFP_KERNEL);
|
|
if (!x)
|
|
return -ENOMEM;
|
|
iocb->ki_dtor = sock_aio_dtor;
|
|
}
|
|
iocb->private = x;
|
|
x->kiocb = iocb;
|
|
sock = SOCKET_I(iocb->ki_filp->f_dentry->d_inode);
|
|
|
|
x->async_msg.msg_name = NULL;
|
|
x->async_msg.msg_namelen = 0;
|
|
x->async_msg.msg_iov = &x->async_iov;
|
|
x->async_msg.msg_iovlen = 1;
|
|
x->async_msg.msg_control = NULL;
|
|
x->async_msg.msg_controllen = 0;
|
|
x->async_msg.msg_flags = !(iocb->ki_filp->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
|
|
if (sock->type == SOCK_SEQPACKET)
|
|
x->async_msg.msg_flags |= MSG_EOR;
|
|
x->async_iov.iov_base = (void __user *)ubuf;
|
|
x->async_iov.iov_len = size;
|
|
|
|
return __sock_sendmsg(iocb, sock, &x->async_msg, size);
|
|
}
|
|
|
|
ssize_t sock_sendpage(struct file *file, struct page *page,
|
|
int offset, size_t size, loff_t *ppos, int more)
|
|
{
|
|
struct socket *sock;
|
|
int flags;
|
|
|
|
sock = SOCKET_I(file->f_dentry->d_inode);
|
|
|
|
flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
|
|
if (more)
|
|
flags |= MSG_MORE;
|
|
|
|
return sock->ops->sendpage(sock, page, offset, size, flags);
|
|
}
|
|
|
|
static int sock_readv_writev(int type, struct inode * inode,
|
|
struct file * file, const struct iovec * iov,
|
|
long count, size_t size)
|
|
{
|
|
struct msghdr msg;
|
|
struct socket *sock;
|
|
|
|
sock = SOCKET_I(inode);
|
|
|
|
msg.msg_name = NULL;
|
|
msg.msg_namelen = 0;
|
|
msg.msg_control = NULL;
|
|
msg.msg_controllen = 0;
|
|
msg.msg_iov = (struct iovec *) iov;
|
|
msg.msg_iovlen = count;
|
|
msg.msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
|
|
|
|
/* read() does a VERIFY_WRITE */
|
|
if (type == VERIFY_WRITE)
|
|
return sock_recvmsg(sock, &msg, size, msg.msg_flags);
|
|
|
|
if (sock->type == SOCK_SEQPACKET)
|
|
msg.msg_flags |= MSG_EOR;
|
|
|
|
return sock_sendmsg(sock, &msg, size);
|
|
}
|
|
|
|
static ssize_t sock_readv(struct file *file, const struct iovec *vector,
|
|
unsigned long count, loff_t *ppos)
|
|
{
|
|
size_t tot_len = 0;
|
|
int i;
|
|
for (i = 0 ; i < count ; i++)
|
|
tot_len += vector[i].iov_len;
|
|
return sock_readv_writev(VERIFY_WRITE, file->f_dentry->d_inode,
|
|
file, vector, count, tot_len);
|
|
}
|
|
|
|
static ssize_t sock_writev(struct file *file, const struct iovec *vector,
|
|
unsigned long count, loff_t *ppos)
|
|
{
|
|
size_t tot_len = 0;
|
|
int i;
|
|
for (i = 0 ; i < count ; i++)
|
|
tot_len += vector[i].iov_len;
|
|
return sock_readv_writev(VERIFY_READ, file->f_dentry->d_inode,
|
|
file, vector, count, tot_len);
|
|
}
|
|
|
|
|
|
/*
|
|
* Atomic setting of ioctl hooks to avoid race
|
|
* with module unload.
|
|
*/
|
|
|
|
static DECLARE_MUTEX(br_ioctl_mutex);
|
|
static int (*br_ioctl_hook)(unsigned int cmd, void __user *arg) = NULL;
|
|
|
|
void brioctl_set(int (*hook)(unsigned int, void __user *))
|
|
{
|
|
down(&br_ioctl_mutex);
|
|
br_ioctl_hook = hook;
|
|
up(&br_ioctl_mutex);
|
|
}
|
|
EXPORT_SYMBOL(brioctl_set);
|
|
|
|
static DECLARE_MUTEX(vlan_ioctl_mutex);
|
|
static int (*vlan_ioctl_hook)(void __user *arg);
|
|
|
|
void vlan_ioctl_set(int (*hook)(void __user *))
|
|
{
|
|
down(&vlan_ioctl_mutex);
|
|
vlan_ioctl_hook = hook;
|
|
up(&vlan_ioctl_mutex);
|
|
}
|
|
EXPORT_SYMBOL(vlan_ioctl_set);
|
|
|
|
static DECLARE_MUTEX(dlci_ioctl_mutex);
|
|
static int (*dlci_ioctl_hook)(unsigned int, void __user *);
|
|
|
|
void dlci_ioctl_set(int (*hook)(unsigned int, void __user *))
|
|
{
|
|
down(&dlci_ioctl_mutex);
|
|
dlci_ioctl_hook = hook;
|
|
up(&dlci_ioctl_mutex);
|
|
}
|
|
EXPORT_SYMBOL(dlci_ioctl_set);
|
|
|
|
/*
|
|
* With an ioctl, arg may well be a user mode pointer, but we don't know
|
|
* what to do with it - that's up to the protocol still.
|
|
*/
|
|
|
|
static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
|
|
{
|
|
struct socket *sock;
|
|
void __user *argp = (void __user *)arg;
|
|
int pid, err;
|
|
|
|
sock = SOCKET_I(file->f_dentry->d_inode);
|
|
if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
|
|
err = dev_ioctl(cmd, argp);
|
|
} else
|
|
#ifdef WIRELESS_EXT
|
|
if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
|
|
err = dev_ioctl(cmd, argp);
|
|
} else
|
|
#endif /* WIRELESS_EXT */
|
|
switch (cmd) {
|
|
case FIOSETOWN:
|
|
case SIOCSPGRP:
|
|
err = -EFAULT;
|
|
if (get_user(pid, (int __user *)argp))
|
|
break;
|
|
err = f_setown(sock->file, pid, 1);
|
|
break;
|
|
case FIOGETOWN:
|
|
case SIOCGPGRP:
|
|
err = put_user(sock->file->f_owner.pid, (int __user *)argp);
|
|
break;
|
|
case SIOCGIFBR:
|
|
case SIOCSIFBR:
|
|
case SIOCBRADDBR:
|
|
case SIOCBRDELBR:
|
|
err = -ENOPKG;
|
|
if (!br_ioctl_hook)
|
|
request_module("bridge");
|
|
|
|
down(&br_ioctl_mutex);
|
|
if (br_ioctl_hook)
|
|
err = br_ioctl_hook(cmd, argp);
|
|
up(&br_ioctl_mutex);
|
|
break;
|
|
case SIOCGIFVLAN:
|
|
case SIOCSIFVLAN:
|
|
err = -ENOPKG;
|
|
if (!vlan_ioctl_hook)
|
|
request_module("8021q");
|
|
|
|
down(&vlan_ioctl_mutex);
|
|
if (vlan_ioctl_hook)
|
|
err = vlan_ioctl_hook(argp);
|
|
up(&vlan_ioctl_mutex);
|
|
break;
|
|
case SIOCGIFDIVERT:
|
|
case SIOCSIFDIVERT:
|
|
/* Convert this to call through a hook */
|
|
err = divert_ioctl(cmd, argp);
|
|
break;
|
|
case SIOCADDDLCI:
|
|
case SIOCDELDLCI:
|
|
err = -ENOPKG;
|
|
if (!dlci_ioctl_hook)
|
|
request_module("dlci");
|
|
|
|
if (dlci_ioctl_hook) {
|
|
down(&dlci_ioctl_mutex);
|
|
err = dlci_ioctl_hook(cmd, argp);
|
|
up(&dlci_ioctl_mutex);
|
|
}
|
|
break;
|
|
default:
|
|
err = sock->ops->ioctl(sock, cmd, arg);
|
|
break;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
int sock_create_lite(int family, int type, int protocol, struct socket **res)
|
|
{
|
|
int err;
|
|
struct socket *sock = NULL;
|
|
|
|
err = security_socket_create(family, type, protocol, 1);
|
|
if (err)
|
|
goto out;
|
|
|
|
sock = sock_alloc();
|
|
if (!sock) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
security_socket_post_create(sock, family, type, protocol, 1);
|
|
sock->type = type;
|
|
out:
|
|
*res = sock;
|
|
return err;
|
|
}
|
|
|
|
/* No kernel lock held - perfect */
|
|
static unsigned int sock_poll(struct file *file, poll_table * wait)
|
|
{
|
|
struct socket *sock;
|
|
|
|
/*
|
|
* We can't return errors to poll, so it's either yes or no.
|
|
*/
|
|
sock = SOCKET_I(file->f_dentry->d_inode);
|
|
return sock->ops->poll(file, sock, wait);
|
|
}
|
|
|
|
static int sock_mmap(struct file * file, struct vm_area_struct * vma)
|
|
{
|
|
struct socket *sock = SOCKET_I(file->f_dentry->d_inode);
|
|
|
|
return sock->ops->mmap(file, sock, vma);
|
|
}
|
|
|
|
int sock_close(struct inode *inode, struct file *filp)
|
|
{
|
|
/*
|
|
* It was possible the inode is NULL we were
|
|
* closing an unfinished socket.
|
|
*/
|
|
|
|
if (!inode)
|
|
{
|
|
printk(KERN_DEBUG "sock_close: NULL inode\n");
|
|
return 0;
|
|
}
|
|
sock_fasync(-1, filp, 0);
|
|
sock_release(SOCKET_I(inode));
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Update the socket async list
|
|
*
|
|
* Fasync_list locking strategy.
|
|
*
|
|
* 1. fasync_list is modified only under process context socket lock
|
|
* i.e. under semaphore.
|
|
* 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
|
|
* or under socket lock.
|
|
* 3. fasync_list can be used from softirq context, so that
|
|
* modification under socket lock have to be enhanced with
|
|
* write_lock_bh(&sk->sk_callback_lock).
|
|
* --ANK (990710)
|
|
*/
|
|
|
|
static int sock_fasync(int fd, struct file *filp, int on)
|
|
{
|
|
struct fasync_struct *fa, *fna=NULL, **prev;
|
|
struct socket *sock;
|
|
struct sock *sk;
|
|
|
|
if (on)
|
|
{
|
|
fna=(struct fasync_struct *)kmalloc(sizeof(struct fasync_struct), GFP_KERNEL);
|
|
if(fna==NULL)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
sock = SOCKET_I(filp->f_dentry->d_inode);
|
|
|
|
if ((sk=sock->sk) == NULL) {
|
|
kfree(fna);
|
|
return -EINVAL;
|
|
}
|
|
|
|
lock_sock(sk);
|
|
|
|
prev=&(sock->fasync_list);
|
|
|
|
for (fa=*prev; fa!=NULL; prev=&fa->fa_next,fa=*prev)
|
|
if (fa->fa_file==filp)
|
|
break;
|
|
|
|
if(on)
|
|
{
|
|
if(fa!=NULL)
|
|
{
|
|
write_lock_bh(&sk->sk_callback_lock);
|
|
fa->fa_fd=fd;
|
|
write_unlock_bh(&sk->sk_callback_lock);
|
|
|
|
kfree(fna);
|
|
goto out;
|
|
}
|
|
fna->fa_file=filp;
|
|
fna->fa_fd=fd;
|
|
fna->magic=FASYNC_MAGIC;
|
|
fna->fa_next=sock->fasync_list;
|
|
write_lock_bh(&sk->sk_callback_lock);
|
|
sock->fasync_list=fna;
|
|
write_unlock_bh(&sk->sk_callback_lock);
|
|
}
|
|
else
|
|
{
|
|
if (fa!=NULL)
|
|
{
|
|
write_lock_bh(&sk->sk_callback_lock);
|
|
*prev=fa->fa_next;
|
|
write_unlock_bh(&sk->sk_callback_lock);
|
|
kfree(fa);
|
|
}
|
|
}
|
|
|
|
out:
|
|
release_sock(sock->sk);
|
|
return 0;
|
|
}
|
|
|
|
/* This function may be called only under socket lock or callback_lock */
|
|
|
|
int sock_wake_async(struct socket *sock, int how, int band)
|
|
{
|
|
if (!sock || !sock->fasync_list)
|
|
return -1;
|
|
switch (how)
|
|
{
|
|
case 1:
|
|
|
|
if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
|
|
break;
|
|
goto call_kill;
|
|
case 2:
|
|
if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
|
|
break;
|
|
/* fall through */
|
|
case 0:
|
|
call_kill:
|
|
__kill_fasync(sock->fasync_list, SIGIO, band);
|
|
break;
|
|
case 3:
|
|
__kill_fasync(sock->fasync_list, SIGURG, band);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int __sock_create(int family, int type, int protocol, struct socket **res, int kern)
|
|
{
|
|
int err;
|
|
struct socket *sock;
|
|
|
|
/*
|
|
* Check protocol is in range
|
|
*/
|
|
if (family < 0 || family >= NPROTO)
|
|
return -EAFNOSUPPORT;
|
|
if (type < 0 || type >= SOCK_MAX)
|
|
return -EINVAL;
|
|
|
|
/* Compatibility.
|
|
|
|
This uglymoron is moved from INET layer to here to avoid
|
|
deadlock in module load.
|
|
*/
|
|
if (family == PF_INET && type == SOCK_PACKET) {
|
|
static int warned;
|
|
if (!warned) {
|
|
warned = 1;
|
|
printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n", current->comm);
|
|
}
|
|
family = PF_PACKET;
|
|
}
|
|
|
|
err = security_socket_create(family, type, protocol, kern);
|
|
if (err)
|
|
return err;
|
|
|
|
#if defined(CONFIG_KMOD)
|
|
/* Attempt to load a protocol module if the find failed.
|
|
*
|
|
* 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
|
|
* requested real, full-featured networking support upon configuration.
|
|
* Otherwise module support will break!
|
|
*/
|
|
if (net_families[family]==NULL)
|
|
{
|
|
request_module("net-pf-%d",family);
|
|
}
|
|
#endif
|
|
|
|
net_family_read_lock();
|
|
if (net_families[family] == NULL) {
|
|
err = -EAFNOSUPPORT;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Allocate the socket and allow the family to set things up. if
|
|
* the protocol is 0, the family is instructed to select an appropriate
|
|
* default.
|
|
*/
|
|
|
|
if (!(sock = sock_alloc())) {
|
|
printk(KERN_WARNING "socket: no more sockets\n");
|
|
err = -ENFILE; /* Not exactly a match, but its the
|
|
closest posix thing */
|
|
goto out;
|
|
}
|
|
|
|
sock->type = type;
|
|
|
|
/*
|
|
* We will call the ->create function, that possibly is in a loadable
|
|
* module, so we have to bump that loadable module refcnt first.
|
|
*/
|
|
err = -EAFNOSUPPORT;
|
|
if (!try_module_get(net_families[family]->owner))
|
|
goto out_release;
|
|
|
|
if ((err = net_families[family]->create(sock, protocol)) < 0)
|
|
goto out_module_put;
|
|
/*
|
|
* Now to bump the refcnt of the [loadable] module that owns this
|
|
* socket at sock_release time we decrement its refcnt.
|
|
*/
|
|
if (!try_module_get(sock->ops->owner)) {
|
|
sock->ops = NULL;
|
|
goto out_module_put;
|
|
}
|
|
/*
|
|
* Now that we're done with the ->create function, the [loadable]
|
|
* module can have its refcnt decremented
|
|
*/
|
|
module_put(net_families[family]->owner);
|
|
*res = sock;
|
|
security_socket_post_create(sock, family, type, protocol, kern);
|
|
|
|
out:
|
|
net_family_read_unlock();
|
|
return err;
|
|
out_module_put:
|
|
module_put(net_families[family]->owner);
|
|
out_release:
|
|
sock_release(sock);
|
|
goto out;
|
|
}
|
|
|
|
int sock_create(int family, int type, int protocol, struct socket **res)
|
|
{
|
|
return __sock_create(family, type, protocol, res, 0);
|
|
}
|
|
|
|
int sock_create_kern(int family, int type, int protocol, struct socket **res)
|
|
{
|
|
return __sock_create(family, type, protocol, res, 1);
|
|
}
|
|
|
|
asmlinkage long sys_socket(int family, int type, int protocol)
|
|
{
|
|
int retval;
|
|
struct socket *sock;
|
|
|
|
retval = sock_create(family, type, protocol, &sock);
|
|
if (retval < 0)
|
|
goto out;
|
|
|
|
retval = sock_map_fd(sock);
|
|
if (retval < 0)
|
|
goto out_release;
|
|
|
|
out:
|
|
/* It may be already another descriptor 8) Not kernel problem. */
|
|
return retval;
|
|
|
|
out_release:
|
|
sock_release(sock);
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* Create a pair of connected sockets.
|
|
*/
|
|
|
|
asmlinkage long sys_socketpair(int family, int type, int protocol, int __user *usockvec)
|
|
{
|
|
struct socket *sock1, *sock2;
|
|
int fd1, fd2, err;
|
|
|
|
/*
|
|
* Obtain the first socket and check if the underlying protocol
|
|
* supports the socketpair call.
|
|
*/
|
|
|
|
err = sock_create(family, type, protocol, &sock1);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
err = sock_create(family, type, protocol, &sock2);
|
|
if (err < 0)
|
|
goto out_release_1;
|
|
|
|
err = sock1->ops->socketpair(sock1, sock2);
|
|
if (err < 0)
|
|
goto out_release_both;
|
|
|
|
fd1 = fd2 = -1;
|
|
|
|
err = sock_map_fd(sock1);
|
|
if (err < 0)
|
|
goto out_release_both;
|
|
fd1 = err;
|
|
|
|
err = sock_map_fd(sock2);
|
|
if (err < 0)
|
|
goto out_close_1;
|
|
fd2 = err;
|
|
|
|
/* fd1 and fd2 may be already another descriptors.
|
|
* Not kernel problem.
|
|
*/
|
|
|
|
err = put_user(fd1, &usockvec[0]);
|
|
if (!err)
|
|
err = put_user(fd2, &usockvec[1]);
|
|
if (!err)
|
|
return 0;
|
|
|
|
sys_close(fd2);
|
|
sys_close(fd1);
|
|
return err;
|
|
|
|
out_close_1:
|
|
sock_release(sock2);
|
|
sys_close(fd1);
|
|
return err;
|
|
|
|
out_release_both:
|
|
sock_release(sock2);
|
|
out_release_1:
|
|
sock_release(sock1);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
|
|
/*
|
|
* Bind a name to a socket. Nothing much to do here since it's
|
|
* the protocol's responsibility to handle the local address.
|
|
*
|
|
* We move the socket address to kernel space before we call
|
|
* the protocol layer (having also checked the address is ok).
|
|
*/
|
|
|
|
asmlinkage long sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen)
|
|
{
|
|
struct socket *sock;
|
|
char address[MAX_SOCK_ADDR];
|
|
int err;
|
|
|
|
if((sock = sockfd_lookup(fd,&err))!=NULL)
|
|
{
|
|
if((err=move_addr_to_kernel(umyaddr,addrlen,address))>=0) {
|
|
err = security_socket_bind(sock, (struct sockaddr *)address, addrlen);
|
|
if (err) {
|
|
sockfd_put(sock);
|
|
return err;
|
|
}
|
|
err = sock->ops->bind(sock, (struct sockaddr *)address, addrlen);
|
|
}
|
|
sockfd_put(sock);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
|
|
/*
|
|
* Perform a listen. Basically, we allow the protocol to do anything
|
|
* necessary for a listen, and if that works, we mark the socket as
|
|
* ready for listening.
|
|
*/
|
|
|
|
int sysctl_somaxconn = SOMAXCONN;
|
|
|
|
asmlinkage long sys_listen(int fd, int backlog)
|
|
{
|
|
struct socket *sock;
|
|
int err;
|
|
|
|
if ((sock = sockfd_lookup(fd, &err)) != NULL) {
|
|
if ((unsigned) backlog > sysctl_somaxconn)
|
|
backlog = sysctl_somaxconn;
|
|
|
|
err = security_socket_listen(sock, backlog);
|
|
if (err) {
|
|
sockfd_put(sock);
|
|
return err;
|
|
}
|
|
|
|
err=sock->ops->listen(sock, backlog);
|
|
sockfd_put(sock);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
|
|
/*
|
|
* For accept, we attempt to create a new socket, set up the link
|
|
* with the client, wake up the client, then return the new
|
|
* connected fd. We collect the address of the connector in kernel
|
|
* space and move it to user at the very end. This is unclean because
|
|
* we open the socket then return an error.
|
|
*
|
|
* 1003.1g adds the ability to recvmsg() to query connection pending
|
|
* status to recvmsg. We need to add that support in a way thats
|
|
* clean when we restucture accept also.
|
|
*/
|
|
|
|
asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr, int __user *upeer_addrlen)
|
|
{
|
|
struct socket *sock, *newsock;
|
|
int err, len;
|
|
char address[MAX_SOCK_ADDR];
|
|
|
|
sock = sockfd_lookup(fd, &err);
|
|
if (!sock)
|
|
goto out;
|
|
|
|
err = -ENFILE;
|
|
if (!(newsock = sock_alloc()))
|
|
goto out_put;
|
|
|
|
newsock->type = sock->type;
|
|
newsock->ops = sock->ops;
|
|
|
|
err = security_socket_accept(sock, newsock);
|
|
if (err)
|
|
goto out_release;
|
|
|
|
/*
|
|
* We don't need try_module_get here, as the listening socket (sock)
|
|
* has the protocol module (sock->ops->owner) held.
|
|
*/
|
|
__module_get(newsock->ops->owner);
|
|
|
|
err = sock->ops->accept(sock, newsock, sock->file->f_flags);
|
|
if (err < 0)
|
|
goto out_release;
|
|
|
|
if (upeer_sockaddr) {
|
|
if(newsock->ops->getname(newsock, (struct sockaddr *)address, &len, 2)<0) {
|
|
err = -ECONNABORTED;
|
|
goto out_release;
|
|
}
|
|
err = move_addr_to_user(address, len, upeer_sockaddr, upeer_addrlen);
|
|
if (err < 0)
|
|
goto out_release;
|
|
}
|
|
|
|
/* File flags are not inherited via accept() unlike another OSes. */
|
|
|
|
if ((err = sock_map_fd(newsock)) < 0)
|
|
goto out_release;
|
|
|
|
security_socket_post_accept(sock, newsock);
|
|
|
|
out_put:
|
|
sockfd_put(sock);
|
|
out:
|
|
return err;
|
|
out_release:
|
|
sock_release(newsock);
|
|
goto out_put;
|
|
}
|
|
|
|
|
|
/*
|
|
* Attempt to connect to a socket with the server address. The address
|
|
* is in user space so we verify it is OK and move it to kernel space.
|
|
*
|
|
* For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
|
|
* break bindings
|
|
*
|
|
* NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
|
|
* other SEQPACKET protocols that take time to connect() as it doesn't
|
|
* include the -EINPROGRESS status for such sockets.
|
|
*/
|
|
|
|
asmlinkage long sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen)
|
|
{
|
|
struct socket *sock;
|
|
char address[MAX_SOCK_ADDR];
|
|
int err;
|
|
|
|
sock = sockfd_lookup(fd, &err);
|
|
if (!sock)
|
|
goto out;
|
|
err = move_addr_to_kernel(uservaddr, addrlen, address);
|
|
if (err < 0)
|
|
goto out_put;
|
|
|
|
err = security_socket_connect(sock, (struct sockaddr *)address, addrlen);
|
|
if (err)
|
|
goto out_put;
|
|
|
|
err = sock->ops->connect(sock, (struct sockaddr *) address, addrlen,
|
|
sock->file->f_flags);
|
|
out_put:
|
|
sockfd_put(sock);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Get the local address ('name') of a socket object. Move the obtained
|
|
* name to user space.
|
|
*/
|
|
|
|
asmlinkage long sys_getsockname(int fd, struct sockaddr __user *usockaddr, int __user *usockaddr_len)
|
|
{
|
|
struct socket *sock;
|
|
char address[MAX_SOCK_ADDR];
|
|
int len, err;
|
|
|
|
sock = sockfd_lookup(fd, &err);
|
|
if (!sock)
|
|
goto out;
|
|
|
|
err = security_socket_getsockname(sock);
|
|
if (err)
|
|
goto out_put;
|
|
|
|
err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 0);
|
|
if (err)
|
|
goto out_put;
|
|
err = move_addr_to_user(address, len, usockaddr, usockaddr_len);
|
|
|
|
out_put:
|
|
sockfd_put(sock);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Get the remote address ('name') of a socket object. Move the obtained
|
|
* name to user space.
|
|
*/
|
|
|
|
asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr, int __user *usockaddr_len)
|
|
{
|
|
struct socket *sock;
|
|
char address[MAX_SOCK_ADDR];
|
|
int len, err;
|
|
|
|
if ((sock = sockfd_lookup(fd, &err))!=NULL)
|
|
{
|
|
err = security_socket_getpeername(sock);
|
|
if (err) {
|
|
sockfd_put(sock);
|
|
return err;
|
|
}
|
|
|
|
err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 1);
|
|
if (!err)
|
|
err=move_addr_to_user(address,len, usockaddr, usockaddr_len);
|
|
sockfd_put(sock);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Send a datagram to a given address. We move the address into kernel
|
|
* space and check the user space data area is readable before invoking
|
|
* the protocol.
|
|
*/
|
|
|
|
asmlinkage long sys_sendto(int fd, void __user * buff, size_t len, unsigned flags,
|
|
struct sockaddr __user *addr, int addr_len)
|
|
{
|
|
struct socket *sock;
|
|
char address[MAX_SOCK_ADDR];
|
|
int err;
|
|
struct msghdr msg;
|
|
struct iovec iov;
|
|
|
|
sock = sockfd_lookup(fd, &err);
|
|
if (!sock)
|
|
goto out;
|
|
iov.iov_base=buff;
|
|
iov.iov_len=len;
|
|
msg.msg_name=NULL;
|
|
msg.msg_iov=&iov;
|
|
msg.msg_iovlen=1;
|
|
msg.msg_control=NULL;
|
|
msg.msg_controllen=0;
|
|
msg.msg_namelen=0;
|
|
if(addr)
|
|
{
|
|
err = move_addr_to_kernel(addr, addr_len, address);
|
|
if (err < 0)
|
|
goto out_put;
|
|
msg.msg_name=address;
|
|
msg.msg_namelen=addr_len;
|
|
}
|
|
if (sock->file->f_flags & O_NONBLOCK)
|
|
flags |= MSG_DONTWAIT;
|
|
msg.msg_flags = flags;
|
|
err = sock_sendmsg(sock, &msg, len);
|
|
|
|
out_put:
|
|
sockfd_put(sock);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Send a datagram down a socket.
|
|
*/
|
|
|
|
asmlinkage long sys_send(int fd, void __user * buff, size_t len, unsigned flags)
|
|
{
|
|
return sys_sendto(fd, buff, len, flags, NULL, 0);
|
|
}
|
|
|
|
/*
|
|
* Receive a frame from the socket and optionally record the address of the
|
|
* sender. We verify the buffers are writable and if needed move the
|
|
* sender address from kernel to user space.
|
|
*/
|
|
|
|
asmlinkage long sys_recvfrom(int fd, void __user * ubuf, size_t size, unsigned flags,
|
|
struct sockaddr __user *addr, int __user *addr_len)
|
|
{
|
|
struct socket *sock;
|
|
struct iovec iov;
|
|
struct msghdr msg;
|
|
char address[MAX_SOCK_ADDR];
|
|
int err,err2;
|
|
|
|
sock = sockfd_lookup(fd, &err);
|
|
if (!sock)
|
|
goto out;
|
|
|
|
msg.msg_control=NULL;
|
|
msg.msg_controllen=0;
|
|
msg.msg_iovlen=1;
|
|
msg.msg_iov=&iov;
|
|
iov.iov_len=size;
|
|
iov.iov_base=ubuf;
|
|
msg.msg_name=address;
|
|
msg.msg_namelen=MAX_SOCK_ADDR;
|
|
if (sock->file->f_flags & O_NONBLOCK)
|
|
flags |= MSG_DONTWAIT;
|
|
err=sock_recvmsg(sock, &msg, size, flags);
|
|
|
|
if(err >= 0 && addr != NULL)
|
|
{
|
|
err2=move_addr_to_user(address, msg.msg_namelen, addr, addr_len);
|
|
if(err2<0)
|
|
err=err2;
|
|
}
|
|
sockfd_put(sock);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Receive a datagram from a socket.
|
|
*/
|
|
|
|
asmlinkage long sys_recv(int fd, void __user * ubuf, size_t size, unsigned flags)
|
|
{
|
|
return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
|
|
}
|
|
|
|
/*
|
|
* Set a socket option. Because we don't know the option lengths we have
|
|
* to pass the user mode parameter for the protocols to sort out.
|
|
*/
|
|
|
|
asmlinkage long sys_setsockopt(int fd, int level, int optname, char __user *optval, int optlen)
|
|
{
|
|
int err;
|
|
struct socket *sock;
|
|
|
|
if (optlen < 0)
|
|
return -EINVAL;
|
|
|
|
if ((sock = sockfd_lookup(fd, &err))!=NULL)
|
|
{
|
|
err = security_socket_setsockopt(sock,level,optname);
|
|
if (err) {
|
|
sockfd_put(sock);
|
|
return err;
|
|
}
|
|
|
|
if (level == SOL_SOCKET)
|
|
err=sock_setsockopt(sock,level,optname,optval,optlen);
|
|
else
|
|
err=sock->ops->setsockopt(sock, level, optname, optval, optlen);
|
|
sockfd_put(sock);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Get a socket option. Because we don't know the option lengths we have
|
|
* to pass a user mode parameter for the protocols to sort out.
|
|
*/
|
|
|
|
asmlinkage long sys_getsockopt(int fd, int level, int optname, char __user *optval, int __user *optlen)
|
|
{
|
|
int err;
|
|
struct socket *sock;
|
|
|
|
if ((sock = sockfd_lookup(fd, &err))!=NULL)
|
|
{
|
|
err = security_socket_getsockopt(sock, level,
|
|
optname);
|
|
if (err) {
|
|
sockfd_put(sock);
|
|
return err;
|
|
}
|
|
|
|
if (level == SOL_SOCKET)
|
|
err=sock_getsockopt(sock,level,optname,optval,optlen);
|
|
else
|
|
err=sock->ops->getsockopt(sock, level, optname, optval, optlen);
|
|
sockfd_put(sock);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
|
|
/*
|
|
* Shutdown a socket.
|
|
*/
|
|
|
|
asmlinkage long sys_shutdown(int fd, int how)
|
|
{
|
|
int err;
|
|
struct socket *sock;
|
|
|
|
if ((sock = sockfd_lookup(fd, &err))!=NULL)
|
|
{
|
|
err = security_socket_shutdown(sock, how);
|
|
if (err) {
|
|
sockfd_put(sock);
|
|
return err;
|
|
}
|
|
|
|
err=sock->ops->shutdown(sock, how);
|
|
sockfd_put(sock);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/* A couple of helpful macros for getting the address of the 32/64 bit
|
|
* fields which are the same type (int / unsigned) on our platforms.
|
|
*/
|
|
#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
|
|
#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
|
|
#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
|
|
|
|
|
|
/*
|
|
* BSD sendmsg interface
|
|
*/
|
|
|
|
asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
|
|
{
|
|
struct compat_msghdr __user *msg_compat = (struct compat_msghdr __user *)msg;
|
|
struct socket *sock;
|
|
char address[MAX_SOCK_ADDR];
|
|
struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
|
|
unsigned char ctl[sizeof(struct cmsghdr) + 20]; /* 20 is size of ipv6_pktinfo */
|
|
unsigned char *ctl_buf = ctl;
|
|
struct msghdr msg_sys;
|
|
int err, ctl_len, iov_size, total_len;
|
|
|
|
err = -EFAULT;
|
|
if (MSG_CMSG_COMPAT & flags) {
|
|
if (get_compat_msghdr(&msg_sys, msg_compat))
|
|
return -EFAULT;
|
|
} else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr)))
|
|
return -EFAULT;
|
|
|
|
sock = sockfd_lookup(fd, &err);
|
|
if (!sock)
|
|
goto out;
|
|
|
|
/* do not move before msg_sys is valid */
|
|
err = -EMSGSIZE;
|
|
if (msg_sys.msg_iovlen > UIO_MAXIOV)
|
|
goto out_put;
|
|
|
|
/* Check whether to allocate the iovec area*/
|
|
err = -ENOMEM;
|
|
iov_size = msg_sys.msg_iovlen * sizeof(struct iovec);
|
|
if (msg_sys.msg_iovlen > UIO_FASTIOV) {
|
|
iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
|
|
if (!iov)
|
|
goto out_put;
|
|
}
|
|
|
|
/* This will also move the address data into kernel space */
|
|
if (MSG_CMSG_COMPAT & flags) {
|
|
err = verify_compat_iovec(&msg_sys, iov, address, VERIFY_READ);
|
|
} else
|
|
err = verify_iovec(&msg_sys, iov, address, VERIFY_READ);
|
|
if (err < 0)
|
|
goto out_freeiov;
|
|
total_len = err;
|
|
|
|
err = -ENOBUFS;
|
|
|
|
if (msg_sys.msg_controllen > INT_MAX)
|
|
goto out_freeiov;
|
|
ctl_len = msg_sys.msg_controllen;
|
|
if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
|
|
err = cmsghdr_from_user_compat_to_kern(&msg_sys, ctl, sizeof(ctl));
|
|
if (err)
|
|
goto out_freeiov;
|
|
ctl_buf = msg_sys.msg_control;
|
|
} else if (ctl_len) {
|
|
if (ctl_len > sizeof(ctl))
|
|
{
|
|
ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
|
|
if (ctl_buf == NULL)
|
|
goto out_freeiov;
|
|
}
|
|
err = -EFAULT;
|
|
/*
|
|
* Careful! Before this, msg_sys.msg_control contains a user pointer.
|
|
* Afterwards, it will be a kernel pointer. Thus the compiler-assisted
|
|
* checking falls down on this.
|
|
*/
|
|
if (copy_from_user(ctl_buf, (void __user *) msg_sys.msg_control, ctl_len))
|
|
goto out_freectl;
|
|
msg_sys.msg_control = ctl_buf;
|
|
}
|
|
msg_sys.msg_flags = flags;
|
|
|
|
if (sock->file->f_flags & O_NONBLOCK)
|
|
msg_sys.msg_flags |= MSG_DONTWAIT;
|
|
err = sock_sendmsg(sock, &msg_sys, total_len);
|
|
|
|
out_freectl:
|
|
if (ctl_buf != ctl)
|
|
sock_kfree_s(sock->sk, ctl_buf, ctl_len);
|
|
out_freeiov:
|
|
if (iov != iovstack)
|
|
sock_kfree_s(sock->sk, iov, iov_size);
|
|
out_put:
|
|
sockfd_put(sock);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* BSD recvmsg interface
|
|
*/
|
|
|
|
asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg, unsigned int flags)
|
|
{
|
|
struct compat_msghdr __user *msg_compat = (struct compat_msghdr __user *)msg;
|
|
struct socket *sock;
|
|
struct iovec iovstack[UIO_FASTIOV];
|
|
struct iovec *iov=iovstack;
|
|
struct msghdr msg_sys;
|
|
unsigned long cmsg_ptr;
|
|
int err, iov_size, total_len, len;
|
|
|
|
/* kernel mode address */
|
|
char addr[MAX_SOCK_ADDR];
|
|
|
|
/* user mode address pointers */
|
|
struct sockaddr __user *uaddr;
|
|
int __user *uaddr_len;
|
|
|
|
if (MSG_CMSG_COMPAT & flags) {
|
|
if (get_compat_msghdr(&msg_sys, msg_compat))
|
|
return -EFAULT;
|
|
} else
|
|
if (copy_from_user(&msg_sys,msg,sizeof(struct msghdr)))
|
|
return -EFAULT;
|
|
|
|
sock = sockfd_lookup(fd, &err);
|
|
if (!sock)
|
|
goto out;
|
|
|
|
err = -EMSGSIZE;
|
|
if (msg_sys.msg_iovlen > UIO_MAXIOV)
|
|
goto out_put;
|
|
|
|
/* Check whether to allocate the iovec area*/
|
|
err = -ENOMEM;
|
|
iov_size = msg_sys.msg_iovlen * sizeof(struct iovec);
|
|
if (msg_sys.msg_iovlen > UIO_FASTIOV) {
|
|
iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
|
|
if (!iov)
|
|
goto out_put;
|
|
}
|
|
|
|
/*
|
|
* Save the user-mode address (verify_iovec will change the
|
|
* kernel msghdr to use the kernel address space)
|
|
*/
|
|
|
|
uaddr = (void __user *) msg_sys.msg_name;
|
|
uaddr_len = COMPAT_NAMELEN(msg);
|
|
if (MSG_CMSG_COMPAT & flags) {
|
|
err = verify_compat_iovec(&msg_sys, iov, addr, VERIFY_WRITE);
|
|
} else
|
|
err = verify_iovec(&msg_sys, iov, addr, VERIFY_WRITE);
|
|
if (err < 0)
|
|
goto out_freeiov;
|
|
total_len=err;
|
|
|
|
cmsg_ptr = (unsigned long)msg_sys.msg_control;
|
|
msg_sys.msg_flags = 0;
|
|
if (MSG_CMSG_COMPAT & flags)
|
|
msg_sys.msg_flags = MSG_CMSG_COMPAT;
|
|
|
|
if (sock->file->f_flags & O_NONBLOCK)
|
|
flags |= MSG_DONTWAIT;
|
|
err = sock_recvmsg(sock, &msg_sys, total_len, flags);
|
|
if (err < 0)
|
|
goto out_freeiov;
|
|
len = err;
|
|
|
|
if (uaddr != NULL) {
|
|
err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr, uaddr_len);
|
|
if (err < 0)
|
|
goto out_freeiov;
|
|
}
|
|
err = __put_user(msg_sys.msg_flags, COMPAT_FLAGS(msg));
|
|
if (err)
|
|
goto out_freeiov;
|
|
if (MSG_CMSG_COMPAT & flags)
|
|
err = __put_user((unsigned long)msg_sys.msg_control-cmsg_ptr,
|
|
&msg_compat->msg_controllen);
|
|
else
|
|
err = __put_user((unsigned long)msg_sys.msg_control-cmsg_ptr,
|
|
&msg->msg_controllen);
|
|
if (err)
|
|
goto out_freeiov;
|
|
err = len;
|
|
|
|
out_freeiov:
|
|
if (iov != iovstack)
|
|
sock_kfree_s(sock->sk, iov, iov_size);
|
|
out_put:
|
|
sockfd_put(sock);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
#ifdef __ARCH_WANT_SYS_SOCKETCALL
|
|
|
|
/* Argument list sizes for sys_socketcall */
|
|
#define AL(x) ((x) * sizeof(unsigned long))
|
|
static unsigned char nargs[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
|
|
AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
|
|
AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)};
|
|
#undef AL
|
|
|
|
/*
|
|
* System call vectors.
|
|
*
|
|
* Argument checking cleaned up. Saved 20% in size.
|
|
* This function doesn't need to set the kernel lock because
|
|
* it is set by the callees.
|
|
*/
|
|
|
|
asmlinkage long sys_socketcall(int call, unsigned long __user *args)
|
|
{
|
|
unsigned long a[6];
|
|
unsigned long a0,a1;
|
|
int err;
|
|
|
|
if(call<1||call>SYS_RECVMSG)
|
|
return -EINVAL;
|
|
|
|
/* copy_from_user should be SMP safe. */
|
|
if (copy_from_user(a, args, nargs[call]))
|
|
return -EFAULT;
|
|
|
|
err = audit_socketcall(nargs[call]/sizeof(unsigned long), a);
|
|
if (err)
|
|
return err;
|
|
|
|
a0=a[0];
|
|
a1=a[1];
|
|
|
|
switch(call)
|
|
{
|
|
case SYS_SOCKET:
|
|
err = sys_socket(a0,a1,a[2]);
|
|
break;
|
|
case SYS_BIND:
|
|
err = sys_bind(a0,(struct sockaddr __user *)a1, a[2]);
|
|
break;
|
|
case SYS_CONNECT:
|
|
err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
|
|
break;
|
|
case SYS_LISTEN:
|
|
err = sys_listen(a0,a1);
|
|
break;
|
|
case SYS_ACCEPT:
|
|
err = sys_accept(a0,(struct sockaddr __user *)a1, (int __user *)a[2]);
|
|
break;
|
|
case SYS_GETSOCKNAME:
|
|
err = sys_getsockname(a0,(struct sockaddr __user *)a1, (int __user *)a[2]);
|
|
break;
|
|
case SYS_GETPEERNAME:
|
|
err = sys_getpeername(a0, (struct sockaddr __user *)a1, (int __user *)a[2]);
|
|
break;
|
|
case SYS_SOCKETPAIR:
|
|
err = sys_socketpair(a0,a1, a[2], (int __user *)a[3]);
|
|
break;
|
|
case SYS_SEND:
|
|
err = sys_send(a0, (void __user *)a1, a[2], a[3]);
|
|
break;
|
|
case SYS_SENDTO:
|
|
err = sys_sendto(a0,(void __user *)a1, a[2], a[3],
|
|
(struct sockaddr __user *)a[4], a[5]);
|
|
break;
|
|
case SYS_RECV:
|
|
err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
|
|
break;
|
|
case SYS_RECVFROM:
|
|
err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
|
|
(struct sockaddr __user *)a[4], (int __user *)a[5]);
|
|
break;
|
|
case SYS_SHUTDOWN:
|
|
err = sys_shutdown(a0,a1);
|
|
break;
|
|
case SYS_SETSOCKOPT:
|
|
err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
|
|
break;
|
|
case SYS_GETSOCKOPT:
|
|
err = sys_getsockopt(a0, a1, a[2], (char __user *)a[3], (int __user *)a[4]);
|
|
break;
|
|
case SYS_SENDMSG:
|
|
err = sys_sendmsg(a0, (struct msghdr __user *) a1, a[2]);
|
|
break;
|
|
case SYS_RECVMSG:
|
|
err = sys_recvmsg(a0, (struct msghdr __user *) a1, a[2]);
|
|
break;
|
|
default:
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
#endif /* __ARCH_WANT_SYS_SOCKETCALL */
|
|
|
|
/*
|
|
* This function is called by a protocol handler that wants to
|
|
* advertise its address family, and have it linked into the
|
|
* SOCKET module.
|
|
*/
|
|
|
|
int sock_register(struct net_proto_family *ops)
|
|
{
|
|
int err;
|
|
|
|
if (ops->family >= NPROTO) {
|
|
printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
|
|
return -ENOBUFS;
|
|
}
|
|
net_family_write_lock();
|
|
err = -EEXIST;
|
|
if (net_families[ops->family] == NULL) {
|
|
net_families[ops->family]=ops;
|
|
err = 0;
|
|
}
|
|
net_family_write_unlock();
|
|
printk(KERN_INFO "NET: Registered protocol family %d\n",
|
|
ops->family);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* This function is called by a protocol handler that wants to
|
|
* remove its address family, and have it unlinked from the
|
|
* SOCKET module.
|
|
*/
|
|
|
|
int sock_unregister(int family)
|
|
{
|
|
if (family < 0 || family >= NPROTO)
|
|
return -1;
|
|
|
|
net_family_write_lock();
|
|
net_families[family]=NULL;
|
|
net_family_write_unlock();
|
|
printk(KERN_INFO "NET: Unregistered protocol family %d\n",
|
|
family);
|
|
return 0;
|
|
}
|
|
|
|
|
|
extern void sk_init(void);
|
|
|
|
void __init sock_init(void)
|
|
{
|
|
/*
|
|
* Initialize sock SLAB cache.
|
|
*/
|
|
|
|
sk_init();
|
|
|
|
#ifdef SLAB_SKB
|
|
/*
|
|
* Initialize skbuff SLAB cache
|
|
*/
|
|
skb_init();
|
|
#endif
|
|
|
|
/*
|
|
* Initialize the protocols module.
|
|
*/
|
|
|
|
init_inodecache();
|
|
register_filesystem(&sock_fs_type);
|
|
sock_mnt = kern_mount(&sock_fs_type);
|
|
/* The real protocol initialization is performed when
|
|
* do_initcalls is run.
|
|
*/
|
|
|
|
#ifdef CONFIG_NETFILTER
|
|
netfilter_init();
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
void socket_seq_show(struct seq_file *seq)
|
|
{
|
|
int cpu;
|
|
int counter = 0;
|
|
|
|
for (cpu = 0; cpu < NR_CPUS; cpu++)
|
|
counter += per_cpu(sockets_in_use, cpu);
|
|
|
|
/* It can be negative, by the way. 8) */
|
|
if (counter < 0)
|
|
counter = 0;
|
|
|
|
seq_printf(seq, "sockets: used %d\n", counter);
|
|
}
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
/* ABI emulation layers need these two */
|
|
EXPORT_SYMBOL(move_addr_to_kernel);
|
|
EXPORT_SYMBOL(move_addr_to_user);
|
|
EXPORT_SYMBOL(sock_create);
|
|
EXPORT_SYMBOL(sock_create_kern);
|
|
EXPORT_SYMBOL(sock_create_lite);
|
|
EXPORT_SYMBOL(sock_map_fd);
|
|
EXPORT_SYMBOL(sock_recvmsg);
|
|
EXPORT_SYMBOL(sock_register);
|
|
EXPORT_SYMBOL(sock_release);
|
|
EXPORT_SYMBOL(sock_sendmsg);
|
|
EXPORT_SYMBOL(sock_unregister);
|
|
EXPORT_SYMBOL(sock_wake_async);
|
|
EXPORT_SYMBOL(sockfd_lookup);
|
|
EXPORT_SYMBOL(kernel_sendmsg);
|
|
EXPORT_SYMBOL(kernel_recvmsg);
|