forked from Minki/linux
cc69837fca
linux/netdevice.h is included in very many places, touching any of its dependecies causes large incremental builds. Drop the linux/ethtool.h include, linux/netdevice.h just needs a forward declaration of struct ethtool_ops. Fix all the places which made use of this implicit include. Acked-by: Johannes Berg <johannes@sipsolutions.net> Acked-by: Shannon Nelson <snelson@pensando.io> Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com> Link: https://lore.kernel.org/r/20201120225052.1427503-1-kuba@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
3715 lines
91 KiB
C
3715 lines
91 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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* 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/ethtool.h>
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#include <linux/mm.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/thread_info.h>
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#include <linux/rcupdate.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/mutex.h>
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#include <linux/if_bridge.h>
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#include <linux/if_vlan.h>
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#include <linux/ptp_classify.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/mount.h>
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#include <linux/pseudo_fs.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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#include <linux/wireless.h>
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#include <linux/nsproxy.h>
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#include <linux/magic.h>
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#include <linux/slab.h>
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#include <linux/xattr.h>
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#include <linux/nospec.h>
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#include <linux/indirect_call_wrapper.h>
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#include <linux/uaccess.h>
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#include <asm/unistd.h>
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#include <net/compat.h>
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#include <net/wext.h>
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#include <net/cls_cgroup.h>
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#include <net/sock.h>
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#include <linux/netfilter.h>
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#include <linux/if_tun.h>
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#include <linux/ipv6_route.h>
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#include <linux/route.h>
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#include <linux/termios.h>
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#include <linux/sockios.h>
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#include <net/busy_poll.h>
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#include <linux/errqueue.h>
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#ifdef CONFIG_NET_RX_BUSY_POLL
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unsigned int sysctl_net_busy_read __read_mostly;
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unsigned int sysctl_net_busy_poll __read_mostly;
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#endif
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static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to);
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static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from);
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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 __poll_t 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, unsigned int cmd, unsigned long arg);
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#ifdef CONFIG_COMPAT
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static long compat_sock_ioctl(struct file *file,
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unsigned int cmd, unsigned long arg);
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#endif
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static int sock_fasync(int fd, struct file *filp, int on);
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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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static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
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struct pipe_inode_info *pipe, size_t len,
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unsigned int flags);
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#ifdef CONFIG_PROC_FS
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static void sock_show_fdinfo(struct seq_file *m, struct file *f)
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{
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struct socket *sock = f->private_data;
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if (sock->ops->show_fdinfo)
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sock->ops->show_fdinfo(m, sock);
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}
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#else
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#define sock_show_fdinfo NULL
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#endif
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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 const struct file_operations socket_file_ops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.read_iter = sock_read_iter,
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.write_iter = sock_write_iter,
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.poll = sock_poll,
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.unlocked_ioctl = sock_ioctl,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = compat_sock_ioctl,
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#endif
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.mmap = sock_mmap,
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.release = sock_close,
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.fasync = sock_fasync,
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.sendpage = sock_sendpage,
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.splice_write = generic_splice_sendpage,
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.splice_read = sock_splice_read,
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.show_fdinfo = sock_show_fdinfo,
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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 DEFINE_SPINLOCK(net_family_lock);
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static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
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/*
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* Support routines.
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* 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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/**
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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, struct sockaddr_storage *kaddr)
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{
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if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
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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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static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen,
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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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BUG_ON(klen > sizeof(struct sockaddr_storage));
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err = get_user(len, ulen);
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if (err)
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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)
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return -EINVAL;
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if (len) {
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if (audit_sockaddr(klen, kaddr))
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return -ENOMEM;
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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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static struct kmem_cache *sock_inode_cachep __ro_after_init;
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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 = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
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if (!ei)
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return NULL;
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init_waitqueue_head(&ei->socket.wq.wait);
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ei->socket.wq.fasync_list = NULL;
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ei->socket.wq.flags = 0;
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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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return &ei->vfs_inode;
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}
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static void sock_free_inode(struct inode *inode)
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{
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struct socket_alloc *ei;
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ei = container_of(inode, struct socket_alloc, vfs_inode);
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kmem_cache_free(sock_inode_cachep, ei);
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}
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static void init_once(void *foo)
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{
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struct socket_alloc *ei = (struct socket_alloc *)foo;
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inode_init_once(&ei->vfs_inode);
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}
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static void 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,
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(SLAB_HWCACHE_ALIGN |
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SLAB_RECLAIM_ACCOUNT |
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SLAB_MEM_SPREAD | SLAB_ACCOUNT),
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init_once);
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BUG_ON(sock_inode_cachep == NULL);
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}
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static const struct super_operations sockfs_ops = {
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.alloc_inode = sock_alloc_inode,
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.free_inode = sock_free_inode,
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.statfs = simple_statfs,
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};
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/*
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* sockfs_dname() is called from d_path().
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*/
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static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
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{
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return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
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d_inode(dentry)->i_ino);
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}
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static const struct dentry_operations sockfs_dentry_operations = {
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.d_dname = sockfs_dname,
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};
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static int sockfs_xattr_get(const struct xattr_handler *handler,
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struct dentry *dentry, struct inode *inode,
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const char *suffix, void *value, size_t size)
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{
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if (value) {
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if (dentry->d_name.len + 1 > size)
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return -ERANGE;
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memcpy(value, dentry->d_name.name, dentry->d_name.len + 1);
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}
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return dentry->d_name.len + 1;
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}
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#define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
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#define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
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#define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
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static const struct xattr_handler sockfs_xattr_handler = {
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.name = XATTR_NAME_SOCKPROTONAME,
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.get = sockfs_xattr_get,
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};
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static int sockfs_security_xattr_set(const struct xattr_handler *handler,
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struct dentry *dentry, struct inode *inode,
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const char *suffix, const void *value,
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size_t size, int flags)
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{
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/* Handled by LSM. */
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return -EAGAIN;
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}
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static const struct xattr_handler sockfs_security_xattr_handler = {
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.prefix = XATTR_SECURITY_PREFIX,
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.set = sockfs_security_xattr_set,
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};
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static const struct xattr_handler *sockfs_xattr_handlers[] = {
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&sockfs_xattr_handler,
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&sockfs_security_xattr_handler,
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NULL
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};
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static int sockfs_init_fs_context(struct fs_context *fc)
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{
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struct pseudo_fs_context *ctx = init_pseudo(fc, SOCKFS_MAGIC);
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if (!ctx)
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return -ENOMEM;
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ctx->ops = &sockfs_ops;
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ctx->dops = &sockfs_dentry_operations;
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ctx->xattr = sockfs_xattr_handlers;
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return 0;
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}
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static struct vfsmount *sock_mnt __read_mostly;
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static struct file_system_type sock_fs_type = {
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.name = "sockfs",
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.init_fs_context = sockfs_init_fs_context,
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.kill_sb = kill_anon_super,
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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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* These functions create file structures and maps them to fd space
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* of the 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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/**
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* sock_alloc_file - Bind a &socket to a &file
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* @sock: socket
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* @flags: file status flags
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* @dname: protocol name
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*
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* Returns the &file bound with @sock, implicitly storing it
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* in sock->file. If dname is %NULL, sets to "".
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* On failure the return is a ERR pointer (see linux/err.h).
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* This function uses GFP_KERNEL internally.
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*/
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struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
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{
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struct file *file;
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if (!dname)
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dname = sock->sk ? sock->sk->sk_prot_creator->name : "";
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file = alloc_file_pseudo(SOCK_INODE(sock), sock_mnt, dname,
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O_RDWR | (flags & O_NONBLOCK),
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&socket_file_ops);
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if (IS_ERR(file)) {
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sock_release(sock);
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return file;
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}
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sock->file = file;
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file->private_data = sock;
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stream_open(SOCK_INODE(sock), file);
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return file;
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}
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EXPORT_SYMBOL(sock_alloc_file);
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static int sock_map_fd(struct socket *sock, int flags)
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{
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struct file *newfile;
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int fd = get_unused_fd_flags(flags);
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if (unlikely(fd < 0)) {
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sock_release(sock);
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return fd;
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}
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newfile = sock_alloc_file(sock, flags, NULL);
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if (!IS_ERR(newfile)) {
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fd_install(fd, newfile);
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return fd;
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}
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put_unused_fd(fd);
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return PTR_ERR(newfile);
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}
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/**
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* sock_from_file - Return the &socket bounded to @file.
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* @file: file
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* @err: pointer to an error code return
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*
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* On failure returns %NULL and assigns -ENOTSOCK to @err.
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*/
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struct socket *sock_from_file(struct file *file, int *err)
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{
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if (file->f_op == &socket_file_ops)
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return file->private_data; /* set in sock_map_fd */
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*err = -ENOTSOCK;
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return NULL;
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}
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EXPORT_SYMBOL(sock_from_file);
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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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* to is returned. If an error occurs the err pointer is overwritten
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* 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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*/
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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 socket *sock;
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file = fget(fd);
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if (!file) {
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*err = -EBADF;
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return NULL;
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}
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sock = sock_from_file(file, err);
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if (!sock)
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fput(file);
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return sock;
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}
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EXPORT_SYMBOL(sockfd_lookup);
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static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
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{
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|
struct fd f = fdget(fd);
|
|
struct socket *sock;
|
|
|
|
*err = -EBADF;
|
|
if (f.file) {
|
|
sock = sock_from_file(f.file, err);
|
|
if (likely(sock)) {
|
|
*fput_needed = f.flags & FDPUT_FPUT;
|
|
return sock;
|
|
}
|
|
fdput(f);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
|
|
size_t size)
|
|
{
|
|
ssize_t len;
|
|
ssize_t used = 0;
|
|
|
|
len = security_inode_listsecurity(d_inode(dentry), buffer, size);
|
|
if (len < 0)
|
|
return len;
|
|
used += len;
|
|
if (buffer) {
|
|
if (size < used)
|
|
return -ERANGE;
|
|
buffer += len;
|
|
}
|
|
|
|
len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
|
|
used += len;
|
|
if (buffer) {
|
|
if (size < used)
|
|
return -ERANGE;
|
|
memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
|
|
buffer += len;
|
|
}
|
|
|
|
return used;
|
|
}
|
|
|
|
static int sockfs_setattr(struct dentry *dentry, struct iattr *iattr)
|
|
{
|
|
int err = simple_setattr(dentry, iattr);
|
|
|
|
if (!err && (iattr->ia_valid & ATTR_UID)) {
|
|
struct socket *sock = SOCKET_I(d_inode(dentry));
|
|
|
|
if (sock->sk)
|
|
sock->sk->sk_uid = iattr->ia_uid;
|
|
else
|
|
err = -ENOENT;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static const struct inode_operations sockfs_inode_ops = {
|
|
.listxattr = sockfs_listxattr,
|
|
.setattr = sockfs_setattr,
|
|
};
|
|
|
|
/**
|
|
* sock_alloc - allocate a socket
|
|
*
|
|
* 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. This functions uses GFP_KERNEL internally.
|
|
*/
|
|
|
|
struct socket *sock_alloc(void)
|
|
{
|
|
struct inode *inode;
|
|
struct socket *sock;
|
|
|
|
inode = new_inode_pseudo(sock_mnt->mnt_sb);
|
|
if (!inode)
|
|
return NULL;
|
|
|
|
sock = SOCKET_I(inode);
|
|
|
|
inode->i_ino = get_next_ino();
|
|
inode->i_mode = S_IFSOCK | S_IRWXUGO;
|
|
inode->i_uid = current_fsuid();
|
|
inode->i_gid = current_fsgid();
|
|
inode->i_op = &sockfs_inode_ops;
|
|
|
|
return sock;
|
|
}
|
|
EXPORT_SYMBOL(sock_alloc);
|
|
|
|
static void __sock_release(struct socket *sock, struct inode *inode)
|
|
{
|
|
if (sock->ops) {
|
|
struct module *owner = sock->ops->owner;
|
|
|
|
if (inode)
|
|
inode_lock(inode);
|
|
sock->ops->release(sock);
|
|
sock->sk = NULL;
|
|
if (inode)
|
|
inode_unlock(inode);
|
|
sock->ops = NULL;
|
|
module_put(owner);
|
|
}
|
|
|
|
if (sock->wq.fasync_list)
|
|
pr_err("%s: fasync list not empty!\n", __func__);
|
|
|
|
if (!sock->file) {
|
|
iput(SOCK_INODE(sock));
|
|
return;
|
|
}
|
|
sock->file = NULL;
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
__sock_release(sock, NULL);
|
|
}
|
|
EXPORT_SYMBOL(sock_release);
|
|
|
|
void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags)
|
|
{
|
|
u8 flags = *tx_flags;
|
|
|
|
if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE)
|
|
flags |= SKBTX_HW_TSTAMP;
|
|
|
|
if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE)
|
|
flags |= SKBTX_SW_TSTAMP;
|
|
|
|
if (tsflags & SOF_TIMESTAMPING_TX_SCHED)
|
|
flags |= SKBTX_SCHED_TSTAMP;
|
|
|
|
*tx_flags = flags;
|
|
}
|
|
EXPORT_SYMBOL(__sock_tx_timestamp);
|
|
|
|
INDIRECT_CALLABLE_DECLARE(int inet_sendmsg(struct socket *, struct msghdr *,
|
|
size_t));
|
|
INDIRECT_CALLABLE_DECLARE(int inet6_sendmsg(struct socket *, struct msghdr *,
|
|
size_t));
|
|
static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg)
|
|
{
|
|
int ret = INDIRECT_CALL_INET(sock->ops->sendmsg, inet6_sendmsg,
|
|
inet_sendmsg, sock, msg,
|
|
msg_data_left(msg));
|
|
BUG_ON(ret == -EIOCBQUEUED);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* sock_sendmsg - send a message through @sock
|
|
* @sock: socket
|
|
* @msg: message to send
|
|
*
|
|
* Sends @msg through @sock, passing through LSM.
|
|
* Returns the number of bytes sent, or an error code.
|
|
*/
|
|
int sock_sendmsg(struct socket *sock, struct msghdr *msg)
|
|
{
|
|
int err = security_socket_sendmsg(sock, msg,
|
|
msg_data_left(msg));
|
|
|
|
return err ?: sock_sendmsg_nosec(sock, msg);
|
|
}
|
|
EXPORT_SYMBOL(sock_sendmsg);
|
|
|
|
/**
|
|
* kernel_sendmsg - send a message through @sock (kernel-space)
|
|
* @sock: socket
|
|
* @msg: message header
|
|
* @vec: kernel vec
|
|
* @num: vec array length
|
|
* @size: total message data size
|
|
*
|
|
* Builds the message data with @vec and sends it through @sock.
|
|
* Returns the number of bytes sent, or an error code.
|
|
*/
|
|
|
|
int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
|
|
struct kvec *vec, size_t num, size_t size)
|
|
{
|
|
iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size);
|
|
return sock_sendmsg(sock, msg);
|
|
}
|
|
EXPORT_SYMBOL(kernel_sendmsg);
|
|
|
|
/**
|
|
* kernel_sendmsg_locked - send a message through @sock (kernel-space)
|
|
* @sk: sock
|
|
* @msg: message header
|
|
* @vec: output s/g array
|
|
* @num: output s/g array length
|
|
* @size: total message data size
|
|
*
|
|
* Builds the message data with @vec and sends it through @sock.
|
|
* Returns the number of bytes sent, or an error code.
|
|
* Caller must hold @sk.
|
|
*/
|
|
|
|
int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg,
|
|
struct kvec *vec, size_t num, size_t size)
|
|
{
|
|
struct socket *sock = sk->sk_socket;
|
|
|
|
if (!sock->ops->sendmsg_locked)
|
|
return sock_no_sendmsg_locked(sk, msg, size);
|
|
|
|
iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size);
|
|
|
|
return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg));
|
|
}
|
|
EXPORT_SYMBOL(kernel_sendmsg_locked);
|
|
|
|
static bool skb_is_err_queue(const struct sk_buff *skb)
|
|
{
|
|
/* pkt_type of skbs enqueued on the error queue are set to
|
|
* PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do
|
|
* in recvmsg, since skbs received on a local socket will never
|
|
* have a pkt_type of PACKET_OUTGOING.
|
|
*/
|
|
return skb->pkt_type == PACKET_OUTGOING;
|
|
}
|
|
|
|
/* On transmit, software and hardware timestamps are returned independently.
|
|
* As the two skb clones share the hardware timestamp, which may be updated
|
|
* before the software timestamp is received, a hardware TX timestamp may be
|
|
* returned only if there is no software TX timestamp. Ignore false software
|
|
* timestamps, which may be made in the __sock_recv_timestamp() call when the
|
|
* option SO_TIMESTAMP_OLD(NS) is enabled on the socket, even when the skb has a
|
|
* hardware timestamp.
|
|
*/
|
|
static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp)
|
|
{
|
|
return skb->tstamp && !false_tstamp && skb_is_err_queue(skb);
|
|
}
|
|
|
|
static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb)
|
|
{
|
|
struct scm_ts_pktinfo ts_pktinfo;
|
|
struct net_device *orig_dev;
|
|
|
|
if (!skb_mac_header_was_set(skb))
|
|
return;
|
|
|
|
memset(&ts_pktinfo, 0, sizeof(ts_pktinfo));
|
|
|
|
rcu_read_lock();
|
|
orig_dev = dev_get_by_napi_id(skb_napi_id(skb));
|
|
if (orig_dev)
|
|
ts_pktinfo.if_index = orig_dev->ifindex;
|
|
rcu_read_unlock();
|
|
|
|
ts_pktinfo.pkt_length = skb->len - skb_mac_offset(skb);
|
|
put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO,
|
|
sizeof(ts_pktinfo), &ts_pktinfo);
|
|
}
|
|
|
|
/*
|
|
* called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
|
|
*/
|
|
void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
|
|
int new_tstamp = sock_flag(sk, SOCK_TSTAMP_NEW);
|
|
struct scm_timestamping_internal tss;
|
|
|
|
int empty = 1, false_tstamp = 0;
|
|
struct skb_shared_hwtstamps *shhwtstamps =
|
|
skb_hwtstamps(skb);
|
|
|
|
/* Race occurred between timestamp enabling and packet
|
|
receiving. Fill in the current time for now. */
|
|
if (need_software_tstamp && skb->tstamp == 0) {
|
|
__net_timestamp(skb);
|
|
false_tstamp = 1;
|
|
}
|
|
|
|
if (need_software_tstamp) {
|
|
if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
|
|
if (new_tstamp) {
|
|
struct __kernel_sock_timeval tv;
|
|
|
|
skb_get_new_timestamp(skb, &tv);
|
|
put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_NEW,
|
|
sizeof(tv), &tv);
|
|
} else {
|
|
struct __kernel_old_timeval tv;
|
|
|
|
skb_get_timestamp(skb, &tv);
|
|
put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_OLD,
|
|
sizeof(tv), &tv);
|
|
}
|
|
} else {
|
|
if (new_tstamp) {
|
|
struct __kernel_timespec ts;
|
|
|
|
skb_get_new_timestampns(skb, &ts);
|
|
put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_NEW,
|
|
sizeof(ts), &ts);
|
|
} else {
|
|
struct __kernel_old_timespec ts;
|
|
|
|
skb_get_timestampns(skb, &ts);
|
|
put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_OLD,
|
|
sizeof(ts), &ts);
|
|
}
|
|
}
|
|
}
|
|
|
|
memset(&tss, 0, sizeof(tss));
|
|
if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) &&
|
|
ktime_to_timespec64_cond(skb->tstamp, tss.ts + 0))
|
|
empty = 0;
|
|
if (shhwtstamps &&
|
|
(sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
|
|
!skb_is_swtx_tstamp(skb, false_tstamp) &&
|
|
ktime_to_timespec64_cond(shhwtstamps->hwtstamp, tss.ts + 2)) {
|
|
empty = 0;
|
|
if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) &&
|
|
!skb_is_err_queue(skb))
|
|
put_ts_pktinfo(msg, skb);
|
|
}
|
|
if (!empty) {
|
|
if (sock_flag(sk, SOCK_TSTAMP_NEW))
|
|
put_cmsg_scm_timestamping64(msg, &tss);
|
|
else
|
|
put_cmsg_scm_timestamping(msg, &tss);
|
|
|
|
if (skb_is_err_queue(skb) && skb->len &&
|
|
SKB_EXT_ERR(skb)->opt_stats)
|
|
put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS,
|
|
skb->len, skb->data);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
|
|
|
|
void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
int ack;
|
|
|
|
if (!sock_flag(sk, SOCK_WIFI_STATUS))
|
|
return;
|
|
if (!skb->wifi_acked_valid)
|
|
return;
|
|
|
|
ack = skb->wifi_acked;
|
|
|
|
put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
|
|
|
|
static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount)
|
|
put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
|
|
sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount);
|
|
}
|
|
|
|
void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
sock_recv_timestamp(msg, sk, skb);
|
|
sock_recv_drops(msg, sk, skb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
|
|
|
|
INDIRECT_CALLABLE_DECLARE(int inet_recvmsg(struct socket *, struct msghdr *,
|
|
size_t, int));
|
|
INDIRECT_CALLABLE_DECLARE(int inet6_recvmsg(struct socket *, struct msghdr *,
|
|
size_t, int));
|
|
static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
|
|
int flags)
|
|
{
|
|
return INDIRECT_CALL_INET(sock->ops->recvmsg, inet6_recvmsg,
|
|
inet_recvmsg, sock, msg, msg_data_left(msg),
|
|
flags);
|
|
}
|
|
|
|
/**
|
|
* sock_recvmsg - receive a message from @sock
|
|
* @sock: socket
|
|
* @msg: message to receive
|
|
* @flags: message flags
|
|
*
|
|
* Receives @msg from @sock, passing through LSM. Returns the total number
|
|
* of bytes received, or an error.
|
|
*/
|
|
int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags)
|
|
{
|
|
int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags);
|
|
|
|
return err ?: sock_recvmsg_nosec(sock, msg, flags);
|
|
}
|
|
EXPORT_SYMBOL(sock_recvmsg);
|
|
|
|
/**
|
|
* kernel_recvmsg - Receive a message from a socket (kernel space)
|
|
* @sock: The socket to receive the message from
|
|
* @msg: Received message
|
|
* @vec: Input s/g array for message data
|
|
* @num: Size of input s/g array
|
|
* @size: Number of bytes to read
|
|
* @flags: Message flags (MSG_DONTWAIT, etc...)
|
|
*
|
|
* On return the msg structure contains the scatter/gather array passed in the
|
|
* vec argument. The array is modified so that it consists of the unfilled
|
|
* portion of the original array.
|
|
*
|
|
* The returned value is the total number of bytes received, or an error.
|
|
*/
|
|
|
|
int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
|
|
struct kvec *vec, size_t num, size_t size, int flags)
|
|
{
|
|
msg->msg_control_is_user = false;
|
|
iov_iter_kvec(&msg->msg_iter, READ, vec, num, size);
|
|
return sock_recvmsg(sock, msg, flags);
|
|
}
|
|
EXPORT_SYMBOL(kernel_recvmsg);
|
|
|
|
static 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 = file->private_data;
|
|
|
|
flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
|
|
/* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
|
|
flags |= more;
|
|
|
|
return kernel_sendpage(sock, page, offset, size, flags);
|
|
}
|
|
|
|
static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
|
|
struct pipe_inode_info *pipe, size_t len,
|
|
unsigned int flags)
|
|
{
|
|
struct socket *sock = file->private_data;
|
|
|
|
if (unlikely(!sock->ops->splice_read))
|
|
return generic_file_splice_read(file, ppos, pipe, len, flags);
|
|
|
|
return sock->ops->splice_read(sock, ppos, pipe, len, flags);
|
|
}
|
|
|
|
static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
struct socket *sock = file->private_data;
|
|
struct msghdr msg = {.msg_iter = *to,
|
|
.msg_iocb = iocb};
|
|
ssize_t res;
|
|
|
|
if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT))
|
|
msg.msg_flags = MSG_DONTWAIT;
|
|
|
|
if (iocb->ki_pos != 0)
|
|
return -ESPIPE;
|
|
|
|
if (!iov_iter_count(to)) /* Match SYS5 behaviour */
|
|
return 0;
|
|
|
|
res = sock_recvmsg(sock, &msg, msg.msg_flags);
|
|
*to = msg.msg_iter;
|
|
return res;
|
|
}
|
|
|
|
static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
struct socket *sock = file->private_data;
|
|
struct msghdr msg = {.msg_iter = *from,
|
|
.msg_iocb = iocb};
|
|
ssize_t res;
|
|
|
|
if (iocb->ki_pos != 0)
|
|
return -ESPIPE;
|
|
|
|
if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT))
|
|
msg.msg_flags = MSG_DONTWAIT;
|
|
|
|
if (sock->type == SOCK_SEQPACKET)
|
|
msg.msg_flags |= MSG_EOR;
|
|
|
|
res = sock_sendmsg(sock, &msg);
|
|
*from = msg.msg_iter;
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* Atomic setting of ioctl hooks to avoid race
|
|
* with module unload.
|
|
*/
|
|
|
|
static DEFINE_MUTEX(br_ioctl_mutex);
|
|
static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
|
|
|
|
void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
|
|
{
|
|
mutex_lock(&br_ioctl_mutex);
|
|
br_ioctl_hook = hook;
|
|
mutex_unlock(&br_ioctl_mutex);
|
|
}
|
|
EXPORT_SYMBOL(brioctl_set);
|
|
|
|
static DEFINE_MUTEX(vlan_ioctl_mutex);
|
|
static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
|
|
|
|
void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
|
|
{
|
|
mutex_lock(&vlan_ioctl_mutex);
|
|
vlan_ioctl_hook = hook;
|
|
mutex_unlock(&vlan_ioctl_mutex);
|
|
}
|
|
EXPORT_SYMBOL(vlan_ioctl_set);
|
|
|
|
static long sock_do_ioctl(struct net *net, struct socket *sock,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
int err;
|
|
void __user *argp = (void __user *)arg;
|
|
|
|
err = sock->ops->ioctl(sock, cmd, arg);
|
|
|
|
/*
|
|
* If this ioctl is unknown try to hand it down
|
|
* to the NIC driver.
|
|
*/
|
|
if (err != -ENOIOCTLCMD)
|
|
return err;
|
|
|
|
if (cmd == SIOCGIFCONF) {
|
|
struct ifconf ifc;
|
|
if (copy_from_user(&ifc, argp, sizeof(struct ifconf)))
|
|
return -EFAULT;
|
|
rtnl_lock();
|
|
err = dev_ifconf(net, &ifc, sizeof(struct ifreq));
|
|
rtnl_unlock();
|
|
if (!err && copy_to_user(argp, &ifc, sizeof(struct ifconf)))
|
|
err = -EFAULT;
|
|
} else {
|
|
struct ifreq ifr;
|
|
bool need_copyout;
|
|
if (copy_from_user(&ifr, argp, sizeof(struct ifreq)))
|
|
return -EFAULT;
|
|
err = dev_ioctl(net, cmd, &ifr, &need_copyout);
|
|
if (!err && need_copyout)
|
|
if (copy_to_user(argp, &ifr, sizeof(struct ifreq)))
|
|
return -EFAULT;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
/**
|
|
* get_net_ns - increment the refcount of the network namespace
|
|
* @ns: common namespace (net)
|
|
*
|
|
* Returns the net's common namespace.
|
|
*/
|
|
|
|
struct ns_common *get_net_ns(struct ns_common *ns)
|
|
{
|
|
return &get_net(container_of(ns, struct net, ns))->ns;
|
|
}
|
|
EXPORT_SYMBOL_GPL(get_net_ns);
|
|
|
|
static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
|
|
{
|
|
struct socket *sock;
|
|
struct sock *sk;
|
|
void __user *argp = (void __user *)arg;
|
|
int pid, err;
|
|
struct net *net;
|
|
|
|
sock = file->private_data;
|
|
sk = sock->sk;
|
|
net = sock_net(sk);
|
|
if (unlikely(cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))) {
|
|
struct ifreq ifr;
|
|
bool need_copyout;
|
|
if (copy_from_user(&ifr, argp, sizeof(struct ifreq)))
|
|
return -EFAULT;
|
|
err = dev_ioctl(net, cmd, &ifr, &need_copyout);
|
|
if (!err && need_copyout)
|
|
if (copy_to_user(argp, &ifr, sizeof(struct ifreq)))
|
|
return -EFAULT;
|
|
} else
|
|
#ifdef CONFIG_WEXT_CORE
|
|
if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
|
|
err = wext_handle_ioctl(net, cmd, argp);
|
|
} else
|
|
#endif
|
|
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(f_getown(sock->file),
|
|
(int __user *)argp);
|
|
break;
|
|
case SIOCGIFBR:
|
|
case SIOCSIFBR:
|
|
case SIOCBRADDBR:
|
|
case SIOCBRDELBR:
|
|
err = -ENOPKG;
|
|
if (!br_ioctl_hook)
|
|
request_module("bridge");
|
|
|
|
mutex_lock(&br_ioctl_mutex);
|
|
if (br_ioctl_hook)
|
|
err = br_ioctl_hook(net, cmd, argp);
|
|
mutex_unlock(&br_ioctl_mutex);
|
|
break;
|
|
case SIOCGIFVLAN:
|
|
case SIOCSIFVLAN:
|
|
err = -ENOPKG;
|
|
if (!vlan_ioctl_hook)
|
|
request_module("8021q");
|
|
|
|
mutex_lock(&vlan_ioctl_mutex);
|
|
if (vlan_ioctl_hook)
|
|
err = vlan_ioctl_hook(net, argp);
|
|
mutex_unlock(&vlan_ioctl_mutex);
|
|
break;
|
|
case SIOCGSKNS:
|
|
err = -EPERM;
|
|
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
|
|
break;
|
|
|
|
err = open_related_ns(&net->ns, get_net_ns);
|
|
break;
|
|
case SIOCGSTAMP_OLD:
|
|
case SIOCGSTAMPNS_OLD:
|
|
if (!sock->ops->gettstamp) {
|
|
err = -ENOIOCTLCMD;
|
|
break;
|
|
}
|
|
err = sock->ops->gettstamp(sock, argp,
|
|
cmd == SIOCGSTAMP_OLD,
|
|
!IS_ENABLED(CONFIG_64BIT));
|
|
break;
|
|
case SIOCGSTAMP_NEW:
|
|
case SIOCGSTAMPNS_NEW:
|
|
if (!sock->ops->gettstamp) {
|
|
err = -ENOIOCTLCMD;
|
|
break;
|
|
}
|
|
err = sock->ops->gettstamp(sock, argp,
|
|
cmd == SIOCGSTAMP_NEW,
|
|
false);
|
|
break;
|
|
default:
|
|
err = sock_do_ioctl(net, sock, cmd, arg);
|
|
break;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* sock_create_lite - creates a socket
|
|
* @family: protocol family (AF_INET, ...)
|
|
* @type: communication type (SOCK_STREAM, ...)
|
|
* @protocol: protocol (0, ...)
|
|
* @res: new socket
|
|
*
|
|
* Creates a new socket and assigns it to @res, passing through LSM.
|
|
* The new socket initialization is not complete, see kernel_accept().
|
|
* Returns 0 or an error. On failure @res is set to %NULL.
|
|
* This function internally uses GFP_KERNEL.
|
|
*/
|
|
|
|
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;
|
|
}
|
|
|
|
sock->type = type;
|
|
err = security_socket_post_create(sock, family, type, protocol, 1);
|
|
if (err)
|
|
goto out_release;
|
|
|
|
out:
|
|
*res = sock;
|
|
return err;
|
|
out_release:
|
|
sock_release(sock);
|
|
sock = NULL;
|
|
goto out;
|
|
}
|
|
EXPORT_SYMBOL(sock_create_lite);
|
|
|
|
/* No kernel lock held - perfect */
|
|
static __poll_t sock_poll(struct file *file, poll_table *wait)
|
|
{
|
|
struct socket *sock = file->private_data;
|
|
__poll_t events = poll_requested_events(wait), flag = 0;
|
|
|
|
if (!sock->ops->poll)
|
|
return 0;
|
|
|
|
if (sk_can_busy_loop(sock->sk)) {
|
|
/* poll once if requested by the syscall */
|
|
if (events & POLL_BUSY_LOOP)
|
|
sk_busy_loop(sock->sk, 1);
|
|
|
|
/* if this socket can poll_ll, tell the system call */
|
|
flag = POLL_BUSY_LOOP;
|
|
}
|
|
|
|
return sock->ops->poll(file, sock, wait) | flag;
|
|
}
|
|
|
|
static int sock_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
struct socket *sock = file->private_data;
|
|
|
|
return sock->ops->mmap(file, sock, vma);
|
|
}
|
|
|
|
static int sock_close(struct inode *inode, struct file *filp)
|
|
{
|
|
__sock_release(SOCKET_I(inode), 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
|
|
*/
|
|
|
|
static int sock_fasync(int fd, struct file *filp, int on)
|
|
{
|
|
struct socket *sock = filp->private_data;
|
|
struct sock *sk = sock->sk;
|
|
struct socket_wq *wq = &sock->wq;
|
|
|
|
if (sk == NULL)
|
|
return -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
fasync_helper(fd, filp, on, &wq->fasync_list);
|
|
|
|
if (!wq->fasync_list)
|
|
sock_reset_flag(sk, SOCK_FASYNC);
|
|
else
|
|
sock_set_flag(sk, SOCK_FASYNC);
|
|
|
|
release_sock(sk);
|
|
return 0;
|
|
}
|
|
|
|
/* This function may be called only under rcu_lock */
|
|
|
|
int sock_wake_async(struct socket_wq *wq, int how, int band)
|
|
{
|
|
if (!wq || !wq->fasync_list)
|
|
return -1;
|
|
|
|
switch (how) {
|
|
case SOCK_WAKE_WAITD:
|
|
if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags))
|
|
break;
|
|
goto call_kill;
|
|
case SOCK_WAKE_SPACE:
|
|
if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags))
|
|
break;
|
|
fallthrough;
|
|
case SOCK_WAKE_IO:
|
|
call_kill:
|
|
kill_fasync(&wq->fasync_list, SIGIO, band);
|
|
break;
|
|
case SOCK_WAKE_URG:
|
|
kill_fasync(&wq->fasync_list, SIGURG, band);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(sock_wake_async);
|
|
|
|
/**
|
|
* __sock_create - creates a socket
|
|
* @net: net namespace
|
|
* @family: protocol family (AF_INET, ...)
|
|
* @type: communication type (SOCK_STREAM, ...)
|
|
* @protocol: protocol (0, ...)
|
|
* @res: new socket
|
|
* @kern: boolean for kernel space sockets
|
|
*
|
|
* Creates a new socket and assigns it to @res, passing through LSM.
|
|
* Returns 0 or an error. On failure @res is set to %NULL. @kern must
|
|
* be set to true if the socket resides in kernel space.
|
|
* This function internally uses GFP_KERNEL.
|
|
*/
|
|
|
|
int __sock_create(struct net *net, int family, int type, int protocol,
|
|
struct socket **res, int kern)
|
|
{
|
|
int err;
|
|
struct socket *sock;
|
|
const struct net_proto_family *pf;
|
|
|
|
/*
|
|
* 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) {
|
|
pr_info_once("%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;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
sock = sock_alloc();
|
|
if (!sock) {
|
|
net_warn_ratelimited("socket: no more sockets\n");
|
|
return -ENFILE; /* Not exactly a match, but its the
|
|
closest posix thing */
|
|
}
|
|
|
|
sock->type = type;
|
|
|
|
#ifdef CONFIG_MODULES
|
|
/* 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 (rcu_access_pointer(net_families[family]) == NULL)
|
|
request_module("net-pf-%d", family);
|
|
#endif
|
|
|
|
rcu_read_lock();
|
|
pf = rcu_dereference(net_families[family]);
|
|
err = -EAFNOSUPPORT;
|
|
if (!pf)
|
|
goto out_release;
|
|
|
|
/*
|
|
* We will call the ->create function, that possibly is in a loadable
|
|
* module, so we have to bump that loadable module refcnt first.
|
|
*/
|
|
if (!try_module_get(pf->owner))
|
|
goto out_release;
|
|
|
|
/* Now protected by module ref count */
|
|
rcu_read_unlock();
|
|
|
|
err = pf->create(net, sock, protocol, kern);
|
|
if (err < 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))
|
|
goto out_module_busy;
|
|
|
|
/*
|
|
* Now that we're done with the ->create function, the [loadable]
|
|
* module can have its refcnt decremented
|
|
*/
|
|
module_put(pf->owner);
|
|
err = security_socket_post_create(sock, family, type, protocol, kern);
|
|
if (err)
|
|
goto out_sock_release;
|
|
*res = sock;
|
|
|
|
return 0;
|
|
|
|
out_module_busy:
|
|
err = -EAFNOSUPPORT;
|
|
out_module_put:
|
|
sock->ops = NULL;
|
|
module_put(pf->owner);
|
|
out_sock_release:
|
|
sock_release(sock);
|
|
return err;
|
|
|
|
out_release:
|
|
rcu_read_unlock();
|
|
goto out_sock_release;
|
|
}
|
|
EXPORT_SYMBOL(__sock_create);
|
|
|
|
/**
|
|
* sock_create - creates a socket
|
|
* @family: protocol family (AF_INET, ...)
|
|
* @type: communication type (SOCK_STREAM, ...)
|
|
* @protocol: protocol (0, ...)
|
|
* @res: new socket
|
|
*
|
|
* A wrapper around __sock_create().
|
|
* Returns 0 or an error. This function internally uses GFP_KERNEL.
|
|
*/
|
|
|
|
int sock_create(int family, int type, int protocol, struct socket **res)
|
|
{
|
|
return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
|
|
}
|
|
EXPORT_SYMBOL(sock_create);
|
|
|
|
/**
|
|
* sock_create_kern - creates a socket (kernel space)
|
|
* @net: net namespace
|
|
* @family: protocol family (AF_INET, ...)
|
|
* @type: communication type (SOCK_STREAM, ...)
|
|
* @protocol: protocol (0, ...)
|
|
* @res: new socket
|
|
*
|
|
* A wrapper around __sock_create().
|
|
* Returns 0 or an error. This function internally uses GFP_KERNEL.
|
|
*/
|
|
|
|
int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res)
|
|
{
|
|
return __sock_create(net, family, type, protocol, res, 1);
|
|
}
|
|
EXPORT_SYMBOL(sock_create_kern);
|
|
|
|
int __sys_socket(int family, int type, int protocol)
|
|
{
|
|
int retval;
|
|
struct socket *sock;
|
|
int flags;
|
|
|
|
/* Check the SOCK_* constants for consistency. */
|
|
BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
|
|
BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
|
|
BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
|
|
BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
|
|
|
|
flags = type & ~SOCK_TYPE_MASK;
|
|
if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
|
|
return -EINVAL;
|
|
type &= SOCK_TYPE_MASK;
|
|
|
|
if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
|
|
flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
|
|
|
|
retval = sock_create(family, type, protocol, &sock);
|
|
if (retval < 0)
|
|
return retval;
|
|
|
|
return sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
|
|
}
|
|
|
|
SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
|
|
{
|
|
return __sys_socket(family, type, protocol);
|
|
}
|
|
|
|
/*
|
|
* Create a pair of connected sockets.
|
|
*/
|
|
|
|
int __sys_socketpair(int family, int type, int protocol, int __user *usockvec)
|
|
{
|
|
struct socket *sock1, *sock2;
|
|
int fd1, fd2, err;
|
|
struct file *newfile1, *newfile2;
|
|
int flags;
|
|
|
|
flags = type & ~SOCK_TYPE_MASK;
|
|
if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
|
|
return -EINVAL;
|
|
type &= SOCK_TYPE_MASK;
|
|
|
|
if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
|
|
flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
|
|
|
|
/*
|
|
* reserve descriptors and make sure we won't fail
|
|
* to return them to userland.
|
|
*/
|
|
fd1 = get_unused_fd_flags(flags);
|
|
if (unlikely(fd1 < 0))
|
|
return fd1;
|
|
|
|
fd2 = get_unused_fd_flags(flags);
|
|
if (unlikely(fd2 < 0)) {
|
|
put_unused_fd(fd1);
|
|
return fd2;
|
|
}
|
|
|
|
err = put_user(fd1, &usockvec[0]);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = put_user(fd2, &usockvec[1]);
|
|
if (err)
|
|
goto out;
|
|
|
|
/*
|
|
* Obtain the first socket and check if the underlying protocol
|
|
* supports the socketpair call.
|
|
*/
|
|
|
|
err = sock_create(family, type, protocol, &sock1);
|
|
if (unlikely(err < 0))
|
|
goto out;
|
|
|
|
err = sock_create(family, type, protocol, &sock2);
|
|
if (unlikely(err < 0)) {
|
|
sock_release(sock1);
|
|
goto out;
|
|
}
|
|
|
|
err = security_socket_socketpair(sock1, sock2);
|
|
if (unlikely(err)) {
|
|
sock_release(sock2);
|
|
sock_release(sock1);
|
|
goto out;
|
|
}
|
|
|
|
err = sock1->ops->socketpair(sock1, sock2);
|
|
if (unlikely(err < 0)) {
|
|
sock_release(sock2);
|
|
sock_release(sock1);
|
|
goto out;
|
|
}
|
|
|
|
newfile1 = sock_alloc_file(sock1, flags, NULL);
|
|
if (IS_ERR(newfile1)) {
|
|
err = PTR_ERR(newfile1);
|
|
sock_release(sock2);
|
|
goto out;
|
|
}
|
|
|
|
newfile2 = sock_alloc_file(sock2, flags, NULL);
|
|
if (IS_ERR(newfile2)) {
|
|
err = PTR_ERR(newfile2);
|
|
fput(newfile1);
|
|
goto out;
|
|
}
|
|
|
|
audit_fd_pair(fd1, fd2);
|
|
|
|
fd_install(fd1, newfile1);
|
|
fd_install(fd2, newfile2);
|
|
return 0;
|
|
|
|
out:
|
|
put_unused_fd(fd2);
|
|
put_unused_fd(fd1);
|
|
return err;
|
|
}
|
|
|
|
SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
|
|
int __user *, usockvec)
|
|
{
|
|
return __sys_socketpair(family, type, protocol, usockvec);
|
|
}
|
|
|
|
/*
|
|
* 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).
|
|
*/
|
|
|
|
int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen)
|
|
{
|
|
struct socket *sock;
|
|
struct sockaddr_storage address;
|
|
int err, fput_needed;
|
|
|
|
sock = sockfd_lookup_light(fd, &err, &fput_needed);
|
|
if (sock) {
|
|
err = move_addr_to_kernel(umyaddr, addrlen, &address);
|
|
if (!err) {
|
|
err = security_socket_bind(sock,
|
|
(struct sockaddr *)&address,
|
|
addrlen);
|
|
if (!err)
|
|
err = sock->ops->bind(sock,
|
|
(struct sockaddr *)
|
|
&address, addrlen);
|
|
}
|
|
fput_light(sock->file, fput_needed);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
|
|
{
|
|
return __sys_bind(fd, umyaddr, addrlen);
|
|
}
|
|
|
|
/*
|
|
* 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 __sys_listen(int fd, int backlog)
|
|
{
|
|
struct socket *sock;
|
|
int err, fput_needed;
|
|
int somaxconn;
|
|
|
|
sock = sockfd_lookup_light(fd, &err, &fput_needed);
|
|
if (sock) {
|
|
somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
|
|
if ((unsigned int)backlog > somaxconn)
|
|
backlog = somaxconn;
|
|
|
|
err = security_socket_listen(sock, backlog);
|
|
if (!err)
|
|
err = sock->ops->listen(sock, backlog);
|
|
|
|
fput_light(sock->file, fput_needed);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
SYSCALL_DEFINE2(listen, int, fd, int, backlog)
|
|
{
|
|
return __sys_listen(fd, backlog);
|
|
}
|
|
|
|
int __sys_accept4_file(struct file *file, unsigned file_flags,
|
|
struct sockaddr __user *upeer_sockaddr,
|
|
int __user *upeer_addrlen, int flags,
|
|
unsigned long nofile)
|
|
{
|
|
struct socket *sock, *newsock;
|
|
struct file *newfile;
|
|
int err, len, newfd;
|
|
struct sockaddr_storage address;
|
|
|
|
if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
|
|
return -EINVAL;
|
|
|
|
if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
|
|
flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
|
|
|
|
sock = sock_from_file(file, &err);
|
|
if (!sock)
|
|
goto out;
|
|
|
|
err = -ENFILE;
|
|
newsock = sock_alloc();
|
|
if (!newsock)
|
|
goto out;
|
|
|
|
newsock->type = sock->type;
|
|
newsock->ops = sock->ops;
|
|
|
|
/*
|
|
* 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);
|
|
|
|
newfd = __get_unused_fd_flags(flags, nofile);
|
|
if (unlikely(newfd < 0)) {
|
|
err = newfd;
|
|
sock_release(newsock);
|
|
goto out;
|
|
}
|
|
newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
|
|
if (IS_ERR(newfile)) {
|
|
err = PTR_ERR(newfile);
|
|
put_unused_fd(newfd);
|
|
goto out;
|
|
}
|
|
|
|
err = security_socket_accept(sock, newsock);
|
|
if (err)
|
|
goto out_fd;
|
|
|
|
err = sock->ops->accept(sock, newsock, sock->file->f_flags | file_flags,
|
|
false);
|
|
if (err < 0)
|
|
goto out_fd;
|
|
|
|
if (upeer_sockaddr) {
|
|
len = newsock->ops->getname(newsock,
|
|
(struct sockaddr *)&address, 2);
|
|
if (len < 0) {
|
|
err = -ECONNABORTED;
|
|
goto out_fd;
|
|
}
|
|
err = move_addr_to_user(&address,
|
|
len, upeer_sockaddr, upeer_addrlen);
|
|
if (err < 0)
|
|
goto out_fd;
|
|
}
|
|
|
|
/* File flags are not inherited via accept() unlike another OSes. */
|
|
|
|
fd_install(newfd, newfile);
|
|
err = newfd;
|
|
out:
|
|
return err;
|
|
out_fd:
|
|
fput(newfile);
|
|
put_unused_fd(newfd);
|
|
goto out;
|
|
|
|
}
|
|
|
|
/*
|
|
* 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 restructure accept also.
|
|
*/
|
|
|
|
int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr,
|
|
int __user *upeer_addrlen, int flags)
|
|
{
|
|
int ret = -EBADF;
|
|
struct fd f;
|
|
|
|
f = fdget(fd);
|
|
if (f.file) {
|
|
ret = __sys_accept4_file(f.file, 0, upeer_sockaddr,
|
|
upeer_addrlen, flags,
|
|
rlimit(RLIMIT_NOFILE));
|
|
fdput(f);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
|
|
int __user *, upeer_addrlen, int, flags)
|
|
{
|
|
return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, flags);
|
|
}
|
|
|
|
SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
|
|
int __user *, upeer_addrlen)
|
|
{
|
|
return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
int __sys_connect_file(struct file *file, struct sockaddr_storage *address,
|
|
int addrlen, int file_flags)
|
|
{
|
|
struct socket *sock;
|
|
int err;
|
|
|
|
sock = sock_from_file(file, &err);
|
|
if (!sock)
|
|
goto out;
|
|
|
|
err =
|
|
security_socket_connect(sock, (struct sockaddr *)address, addrlen);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen,
|
|
sock->file->f_flags | file_flags);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
int __sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen)
|
|
{
|
|
int ret = -EBADF;
|
|
struct fd f;
|
|
|
|
f = fdget(fd);
|
|
if (f.file) {
|
|
struct sockaddr_storage address;
|
|
|
|
ret = move_addr_to_kernel(uservaddr, addrlen, &address);
|
|
if (!ret)
|
|
ret = __sys_connect_file(f.file, &address, addrlen, 0);
|
|
fdput(f);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
|
|
int, addrlen)
|
|
{
|
|
return __sys_connect(fd, uservaddr, addrlen);
|
|
}
|
|
|
|
/*
|
|
* Get the local address ('name') of a socket object. Move the obtained
|
|
* name to user space.
|
|
*/
|
|
|
|
int __sys_getsockname(int fd, struct sockaddr __user *usockaddr,
|
|
int __user *usockaddr_len)
|
|
{
|
|
struct socket *sock;
|
|
struct sockaddr_storage address;
|
|
int err, fput_needed;
|
|
|
|
sock = sockfd_lookup_light(fd, &err, &fput_needed);
|
|
if (!sock)
|
|
goto out;
|
|
|
|
err = security_socket_getsockname(sock);
|
|
if (err)
|
|
goto out_put;
|
|
|
|
err = sock->ops->getname(sock, (struct sockaddr *)&address, 0);
|
|
if (err < 0)
|
|
goto out_put;
|
|
/* "err" is actually length in this case */
|
|
err = move_addr_to_user(&address, err, usockaddr, usockaddr_len);
|
|
|
|
out_put:
|
|
fput_light(sock->file, fput_needed);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
|
|
int __user *, usockaddr_len)
|
|
{
|
|
return __sys_getsockname(fd, usockaddr, usockaddr_len);
|
|
}
|
|
|
|
/*
|
|
* Get the remote address ('name') of a socket object. Move the obtained
|
|
* name to user space.
|
|
*/
|
|
|
|
int __sys_getpeername(int fd, struct sockaddr __user *usockaddr,
|
|
int __user *usockaddr_len)
|
|
{
|
|
struct socket *sock;
|
|
struct sockaddr_storage address;
|
|
int err, fput_needed;
|
|
|
|
sock = sockfd_lookup_light(fd, &err, &fput_needed);
|
|
if (sock != NULL) {
|
|
err = security_socket_getpeername(sock);
|
|
if (err) {
|
|
fput_light(sock->file, fput_needed);
|
|
return err;
|
|
}
|
|
|
|
err = sock->ops->getname(sock, (struct sockaddr *)&address, 1);
|
|
if (err >= 0)
|
|
/* "err" is actually length in this case */
|
|
err = move_addr_to_user(&address, err, usockaddr,
|
|
usockaddr_len);
|
|
fput_light(sock->file, fput_needed);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
|
|
int __user *, usockaddr_len)
|
|
{
|
|
return __sys_getpeername(fd, usockaddr, usockaddr_len);
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags,
|
|
struct sockaddr __user *addr, int addr_len)
|
|
{
|
|
struct socket *sock;
|
|
struct sockaddr_storage address;
|
|
int err;
|
|
struct msghdr msg;
|
|
struct iovec iov;
|
|
int fput_needed;
|
|
|
|
err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter);
|
|
if (unlikely(err))
|
|
return err;
|
|
sock = sockfd_lookup_light(fd, &err, &fput_needed);
|
|
if (!sock)
|
|
goto out;
|
|
|
|
msg.msg_name = NULL;
|
|
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 = (struct sockaddr *)&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);
|
|
|
|
out_put:
|
|
fput_light(sock->file, fput_needed);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
|
|
unsigned int, flags, struct sockaddr __user *, addr,
|
|
int, addr_len)
|
|
{
|
|
return __sys_sendto(fd, buff, len, flags, addr, addr_len);
|
|
}
|
|
|
|
/*
|
|
* Send a datagram down a socket.
|
|
*/
|
|
|
|
SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
|
|
unsigned int, 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.
|
|
*/
|
|
int __sys_recvfrom(int fd, void __user *ubuf, size_t size, unsigned int flags,
|
|
struct sockaddr __user *addr, int __user *addr_len)
|
|
{
|
|
struct socket *sock;
|
|
struct iovec iov;
|
|
struct msghdr msg;
|
|
struct sockaddr_storage address;
|
|
int err, err2;
|
|
int fput_needed;
|
|
|
|
err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter);
|
|
if (unlikely(err))
|
|
return err;
|
|
sock = sockfd_lookup_light(fd, &err, &fput_needed);
|
|
if (!sock)
|
|
goto out;
|
|
|
|
msg.msg_control = NULL;
|
|
msg.msg_controllen = 0;
|
|
/* Save some cycles and don't copy the address if not needed */
|
|
msg.msg_name = addr ? (struct sockaddr *)&address : NULL;
|
|
/* We assume all kernel code knows the size of sockaddr_storage */
|
|
msg.msg_namelen = 0;
|
|
msg.msg_iocb = NULL;
|
|
msg.msg_flags = 0;
|
|
if (sock->file->f_flags & O_NONBLOCK)
|
|
flags |= MSG_DONTWAIT;
|
|
err = sock_recvmsg(sock, &msg, flags);
|
|
|
|
if (err >= 0 && addr != NULL) {
|
|
err2 = move_addr_to_user(&address,
|
|
msg.msg_namelen, addr, addr_len);
|
|
if (err2 < 0)
|
|
err = err2;
|
|
}
|
|
|
|
fput_light(sock->file, fput_needed);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
|
|
unsigned int, flags, struct sockaddr __user *, addr,
|
|
int __user *, addr_len)
|
|
{
|
|
return __sys_recvfrom(fd, ubuf, size, flags, addr, addr_len);
|
|
}
|
|
|
|
/*
|
|
* Receive a datagram from a socket.
|
|
*/
|
|
|
|
SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size,
|
|
unsigned int, flags)
|
|
{
|
|
return __sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
|
|
}
|
|
|
|
static bool sock_use_custom_sol_socket(const struct socket *sock)
|
|
{
|
|
const struct sock *sk = sock->sk;
|
|
|
|
/* Use sock->ops->setsockopt() for MPTCP */
|
|
return IS_ENABLED(CONFIG_MPTCP) &&
|
|
sk->sk_protocol == IPPROTO_MPTCP &&
|
|
sk->sk_type == SOCK_STREAM &&
|
|
(sk->sk_family == AF_INET || sk->sk_family == AF_INET6);
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
int __sys_setsockopt(int fd, int level, int optname, char __user *user_optval,
|
|
int optlen)
|
|
{
|
|
sockptr_t optval = USER_SOCKPTR(user_optval);
|
|
char *kernel_optval = NULL;
|
|
int err, fput_needed;
|
|
struct socket *sock;
|
|
|
|
if (optlen < 0)
|
|
return -EINVAL;
|
|
|
|
sock = sockfd_lookup_light(fd, &err, &fput_needed);
|
|
if (!sock)
|
|
return err;
|
|
|
|
err = security_socket_setsockopt(sock, level, optname);
|
|
if (err)
|
|
goto out_put;
|
|
|
|
if (!in_compat_syscall())
|
|
err = BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock->sk, &level, &optname,
|
|
user_optval, &optlen,
|
|
&kernel_optval);
|
|
if (err < 0)
|
|
goto out_put;
|
|
if (err > 0) {
|
|
err = 0;
|
|
goto out_put;
|
|
}
|
|
|
|
if (kernel_optval)
|
|
optval = KERNEL_SOCKPTR(kernel_optval);
|
|
if (level == SOL_SOCKET && !sock_use_custom_sol_socket(sock))
|
|
err = sock_setsockopt(sock, level, optname, optval, optlen);
|
|
else if (unlikely(!sock->ops->setsockopt))
|
|
err = -EOPNOTSUPP;
|
|
else
|
|
err = sock->ops->setsockopt(sock, level, optname, optval,
|
|
optlen);
|
|
kfree(kernel_optval);
|
|
out_put:
|
|
fput_light(sock->file, fput_needed);
|
|
return err;
|
|
}
|
|
|
|
SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
|
|
char __user *, optval, int, optlen)
|
|
{
|
|
return __sys_setsockopt(fd, level, optname, optval, optlen);
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
int __sys_getsockopt(int fd, int level, int optname, char __user *optval,
|
|
int __user *optlen)
|
|
{
|
|
int err, fput_needed;
|
|
struct socket *sock;
|
|
int max_optlen;
|
|
|
|
sock = sockfd_lookup_light(fd, &err, &fput_needed);
|
|
if (!sock)
|
|
return err;
|
|
|
|
err = security_socket_getsockopt(sock, level, optname);
|
|
if (err)
|
|
goto out_put;
|
|
|
|
if (!in_compat_syscall())
|
|
max_optlen = BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen);
|
|
|
|
if (level == SOL_SOCKET)
|
|
err = sock_getsockopt(sock, level, optname, optval, optlen);
|
|
else if (unlikely(!sock->ops->getsockopt))
|
|
err = -EOPNOTSUPP;
|
|
else
|
|
err = sock->ops->getsockopt(sock, level, optname, optval,
|
|
optlen);
|
|
|
|
if (!in_compat_syscall())
|
|
err = BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock->sk, level, optname,
|
|
optval, optlen, max_optlen,
|
|
err);
|
|
out_put:
|
|
fput_light(sock->file, fput_needed);
|
|
return err;
|
|
}
|
|
|
|
SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
|
|
char __user *, optval, int __user *, optlen)
|
|
{
|
|
return __sys_getsockopt(fd, level, optname, optval, optlen);
|
|
}
|
|
|
|
/*
|
|
* Shutdown a socket.
|
|
*/
|
|
|
|
int __sys_shutdown(int fd, int how)
|
|
{
|
|
int err, fput_needed;
|
|
struct socket *sock;
|
|
|
|
sock = sockfd_lookup_light(fd, &err, &fput_needed);
|
|
if (sock != NULL) {
|
|
err = security_socket_shutdown(sock, how);
|
|
if (!err)
|
|
err = sock->ops->shutdown(sock, how);
|
|
fput_light(sock->file, fput_needed);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
SYSCALL_DEFINE2(shutdown, int, fd, int, how)
|
|
{
|
|
return __sys_shutdown(fd, how);
|
|
}
|
|
|
|
/* 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)
|
|
|
|
struct used_address {
|
|
struct sockaddr_storage name;
|
|
unsigned int name_len;
|
|
};
|
|
|
|
int __copy_msghdr_from_user(struct msghdr *kmsg,
|
|
struct user_msghdr __user *umsg,
|
|
struct sockaddr __user **save_addr,
|
|
struct iovec __user **uiov, size_t *nsegs)
|
|
{
|
|
struct user_msghdr msg;
|
|
ssize_t err;
|
|
|
|
if (copy_from_user(&msg, umsg, sizeof(*umsg)))
|
|
return -EFAULT;
|
|
|
|
kmsg->msg_control_is_user = true;
|
|
kmsg->msg_control_user = msg.msg_control;
|
|
kmsg->msg_controllen = msg.msg_controllen;
|
|
kmsg->msg_flags = msg.msg_flags;
|
|
|
|
kmsg->msg_namelen = msg.msg_namelen;
|
|
if (!msg.msg_name)
|
|
kmsg->msg_namelen = 0;
|
|
|
|
if (kmsg->msg_namelen < 0)
|
|
return -EINVAL;
|
|
|
|
if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
|
|
kmsg->msg_namelen = sizeof(struct sockaddr_storage);
|
|
|
|
if (save_addr)
|
|
*save_addr = msg.msg_name;
|
|
|
|
if (msg.msg_name && kmsg->msg_namelen) {
|
|
if (!save_addr) {
|
|
err = move_addr_to_kernel(msg.msg_name,
|
|
kmsg->msg_namelen,
|
|
kmsg->msg_name);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
} else {
|
|
kmsg->msg_name = NULL;
|
|
kmsg->msg_namelen = 0;
|
|
}
|
|
|
|
if (msg.msg_iovlen > UIO_MAXIOV)
|
|
return -EMSGSIZE;
|
|
|
|
kmsg->msg_iocb = NULL;
|
|
*uiov = msg.msg_iov;
|
|
*nsegs = msg.msg_iovlen;
|
|
return 0;
|
|
}
|
|
|
|
static int copy_msghdr_from_user(struct msghdr *kmsg,
|
|
struct user_msghdr __user *umsg,
|
|
struct sockaddr __user **save_addr,
|
|
struct iovec **iov)
|
|
{
|
|
struct user_msghdr msg;
|
|
ssize_t err;
|
|
|
|
err = __copy_msghdr_from_user(kmsg, umsg, save_addr, &msg.msg_iov,
|
|
&msg.msg_iovlen);
|
|
if (err)
|
|
return err;
|
|
|
|
err = import_iovec(save_addr ? READ : WRITE,
|
|
msg.msg_iov, msg.msg_iovlen,
|
|
UIO_FASTIOV, iov, &kmsg->msg_iter);
|
|
return err < 0 ? err : 0;
|
|
}
|
|
|
|
static int ____sys_sendmsg(struct socket *sock, struct msghdr *msg_sys,
|
|
unsigned int flags, struct used_address *used_address,
|
|
unsigned int allowed_msghdr_flags)
|
|
{
|
|
unsigned char ctl[sizeof(struct cmsghdr) + 20]
|
|
__aligned(sizeof(__kernel_size_t));
|
|
/* 20 is size of ipv6_pktinfo */
|
|
unsigned char *ctl_buf = ctl;
|
|
int ctl_len;
|
|
ssize_t err;
|
|
|
|
err = -ENOBUFS;
|
|
|
|
if (msg_sys->msg_controllen > INT_MAX)
|
|
goto out;
|
|
flags |= (msg_sys->msg_flags & allowed_msghdr_flags);
|
|
ctl_len = msg_sys->msg_controllen;
|
|
if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
|
|
err =
|
|
cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
|
|
sizeof(ctl));
|
|
if (err)
|
|
goto out;
|
|
ctl_buf = msg_sys->msg_control;
|
|
ctl_len = msg_sys->msg_controllen;
|
|
} else if (ctl_len) {
|
|
BUILD_BUG_ON(sizeof(struct cmsghdr) !=
|
|
CMSG_ALIGN(sizeof(struct cmsghdr)));
|
|
if (ctl_len > sizeof(ctl)) {
|
|
ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
|
|
if (ctl_buf == NULL)
|
|
goto out;
|
|
}
|
|
err = -EFAULT;
|
|
if (copy_from_user(ctl_buf, msg_sys->msg_control_user, ctl_len))
|
|
goto out_freectl;
|
|
msg_sys->msg_control = ctl_buf;
|
|
msg_sys->msg_control_is_user = false;
|
|
}
|
|
msg_sys->msg_flags = flags;
|
|
|
|
if (sock->file->f_flags & O_NONBLOCK)
|
|
msg_sys->msg_flags |= MSG_DONTWAIT;
|
|
/*
|
|
* If this is sendmmsg() and current destination address is same as
|
|
* previously succeeded address, omit asking LSM's decision.
|
|
* used_address->name_len is initialized to UINT_MAX so that the first
|
|
* destination address never matches.
|
|
*/
|
|
if (used_address && msg_sys->msg_name &&
|
|
used_address->name_len == msg_sys->msg_namelen &&
|
|
!memcmp(&used_address->name, msg_sys->msg_name,
|
|
used_address->name_len)) {
|
|
err = sock_sendmsg_nosec(sock, msg_sys);
|
|
goto out_freectl;
|
|
}
|
|
err = sock_sendmsg(sock, msg_sys);
|
|
/*
|
|
* If this is sendmmsg() and sending to current destination address was
|
|
* successful, remember it.
|
|
*/
|
|
if (used_address && err >= 0) {
|
|
used_address->name_len = msg_sys->msg_namelen;
|
|
if (msg_sys->msg_name)
|
|
memcpy(&used_address->name, msg_sys->msg_name,
|
|
used_address->name_len);
|
|
}
|
|
|
|
out_freectl:
|
|
if (ctl_buf != ctl)
|
|
sock_kfree_s(sock->sk, ctl_buf, ctl_len);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
int sendmsg_copy_msghdr(struct msghdr *msg,
|
|
struct user_msghdr __user *umsg, unsigned flags,
|
|
struct iovec **iov)
|
|
{
|
|
int err;
|
|
|
|
if (flags & MSG_CMSG_COMPAT) {
|
|
struct compat_msghdr __user *msg_compat;
|
|
|
|
msg_compat = (struct compat_msghdr __user *) umsg;
|
|
err = get_compat_msghdr(msg, msg_compat, NULL, iov);
|
|
} else {
|
|
err = copy_msghdr_from_user(msg, umsg, NULL, iov);
|
|
}
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
|
|
struct msghdr *msg_sys, unsigned int flags,
|
|
struct used_address *used_address,
|
|
unsigned int allowed_msghdr_flags)
|
|
{
|
|
struct sockaddr_storage address;
|
|
struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
|
|
ssize_t err;
|
|
|
|
msg_sys->msg_name = &address;
|
|
|
|
err = sendmsg_copy_msghdr(msg_sys, msg, flags, &iov);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = ____sys_sendmsg(sock, msg_sys, flags, used_address,
|
|
allowed_msghdr_flags);
|
|
kfree(iov);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* BSD sendmsg interface
|
|
*/
|
|
long __sys_sendmsg_sock(struct socket *sock, struct msghdr *msg,
|
|
unsigned int flags)
|
|
{
|
|
/* disallow ancillary data requests from this path */
|
|
if (msg->msg_control || msg->msg_controllen)
|
|
return -EINVAL;
|
|
|
|
return ____sys_sendmsg(sock, msg, flags, NULL, 0);
|
|
}
|
|
|
|
long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned int flags,
|
|
bool forbid_cmsg_compat)
|
|
{
|
|
int fput_needed, err;
|
|
struct msghdr msg_sys;
|
|
struct socket *sock;
|
|
|
|
if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
|
|
return -EINVAL;
|
|
|
|
sock = sockfd_lookup_light(fd, &err, &fput_needed);
|
|
if (!sock)
|
|
goto out;
|
|
|
|
err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0);
|
|
|
|
fput_light(sock->file, fput_needed);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags)
|
|
{
|
|
return __sys_sendmsg(fd, msg, flags, true);
|
|
}
|
|
|
|
/*
|
|
* Linux sendmmsg interface
|
|
*/
|
|
|
|
int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
|
|
unsigned int flags, bool forbid_cmsg_compat)
|
|
{
|
|
int fput_needed, err, datagrams;
|
|
struct socket *sock;
|
|
struct mmsghdr __user *entry;
|
|
struct compat_mmsghdr __user *compat_entry;
|
|
struct msghdr msg_sys;
|
|
struct used_address used_address;
|
|
unsigned int oflags = flags;
|
|
|
|
if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
|
|
return -EINVAL;
|
|
|
|
if (vlen > UIO_MAXIOV)
|
|
vlen = UIO_MAXIOV;
|
|
|
|
datagrams = 0;
|
|
|
|
sock = sockfd_lookup_light(fd, &err, &fput_needed);
|
|
if (!sock)
|
|
return err;
|
|
|
|
used_address.name_len = UINT_MAX;
|
|
entry = mmsg;
|
|
compat_entry = (struct compat_mmsghdr __user *)mmsg;
|
|
err = 0;
|
|
flags |= MSG_BATCH;
|
|
|
|
while (datagrams < vlen) {
|
|
if (datagrams == vlen - 1)
|
|
flags = oflags;
|
|
|
|
if (MSG_CMSG_COMPAT & flags) {
|
|
err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry,
|
|
&msg_sys, flags, &used_address, MSG_EOR);
|
|
if (err < 0)
|
|
break;
|
|
err = __put_user(err, &compat_entry->msg_len);
|
|
++compat_entry;
|
|
} else {
|
|
err = ___sys_sendmsg(sock,
|
|
(struct user_msghdr __user *)entry,
|
|
&msg_sys, flags, &used_address, MSG_EOR);
|
|
if (err < 0)
|
|
break;
|
|
err = put_user(err, &entry->msg_len);
|
|
++entry;
|
|
}
|
|
|
|
if (err)
|
|
break;
|
|
++datagrams;
|
|
if (msg_data_left(&msg_sys))
|
|
break;
|
|
cond_resched();
|
|
}
|
|
|
|
fput_light(sock->file, fput_needed);
|
|
|
|
/* We only return an error if no datagrams were able to be sent */
|
|
if (datagrams != 0)
|
|
return datagrams;
|
|
|
|
return err;
|
|
}
|
|
|
|
SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
|
|
unsigned int, vlen, unsigned int, flags)
|
|
{
|
|
return __sys_sendmmsg(fd, mmsg, vlen, flags, true);
|
|
}
|
|
|
|
int recvmsg_copy_msghdr(struct msghdr *msg,
|
|
struct user_msghdr __user *umsg, unsigned flags,
|
|
struct sockaddr __user **uaddr,
|
|
struct iovec **iov)
|
|
{
|
|
ssize_t err;
|
|
|
|
if (MSG_CMSG_COMPAT & flags) {
|
|
struct compat_msghdr __user *msg_compat;
|
|
|
|
msg_compat = (struct compat_msghdr __user *) umsg;
|
|
err = get_compat_msghdr(msg, msg_compat, uaddr, iov);
|
|
} else {
|
|
err = copy_msghdr_from_user(msg, umsg, uaddr, iov);
|
|
}
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ____sys_recvmsg(struct socket *sock, struct msghdr *msg_sys,
|
|
struct user_msghdr __user *msg,
|
|
struct sockaddr __user *uaddr,
|
|
unsigned int flags, int nosec)
|
|
{
|
|
struct compat_msghdr __user *msg_compat =
|
|
(struct compat_msghdr __user *) msg;
|
|
int __user *uaddr_len = COMPAT_NAMELEN(msg);
|
|
struct sockaddr_storage addr;
|
|
unsigned long cmsg_ptr;
|
|
int len;
|
|
ssize_t err;
|
|
|
|
msg_sys->msg_name = &addr;
|
|
cmsg_ptr = (unsigned long)msg_sys->msg_control;
|
|
msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
|
|
|
|
/* We assume all kernel code knows the size of sockaddr_storage */
|
|
msg_sys->msg_namelen = 0;
|
|
|
|
if (sock->file->f_flags & O_NONBLOCK)
|
|
flags |= MSG_DONTWAIT;
|
|
|
|
if (unlikely(nosec))
|
|
err = sock_recvmsg_nosec(sock, msg_sys, flags);
|
|
else
|
|
err = sock_recvmsg(sock, msg_sys, flags);
|
|
|
|
if (err < 0)
|
|
goto out;
|
|
len = err;
|
|
|
|
if (uaddr != NULL) {
|
|
err = move_addr_to_user(&addr,
|
|
msg_sys->msg_namelen, uaddr,
|
|
uaddr_len);
|
|
if (err < 0)
|
|
goto out;
|
|
}
|
|
err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
|
|
COMPAT_FLAGS(msg));
|
|
if (err)
|
|
goto out;
|
|
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;
|
|
err = len;
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
|
|
struct msghdr *msg_sys, unsigned int flags, int nosec)
|
|
{
|
|
struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
|
|
/* user mode address pointers */
|
|
struct sockaddr __user *uaddr;
|
|
ssize_t err;
|
|
|
|
err = recvmsg_copy_msghdr(msg_sys, msg, flags, &uaddr, &iov);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = ____sys_recvmsg(sock, msg_sys, msg, uaddr, flags, nosec);
|
|
kfree(iov);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* BSD recvmsg interface
|
|
*/
|
|
|
|
long __sys_recvmsg_sock(struct socket *sock, struct msghdr *msg,
|
|
struct user_msghdr __user *umsg,
|
|
struct sockaddr __user *uaddr, unsigned int flags)
|
|
{
|
|
if (msg->msg_control || msg->msg_controllen) {
|
|
/* disallow ancillary data reqs unless cmsg is plain data */
|
|
if (!(sock->ops->flags & PROTO_CMSG_DATA_ONLY))
|
|
return -EINVAL;
|
|
}
|
|
|
|
return ____sys_recvmsg(sock, msg, umsg, uaddr, flags, 0);
|
|
}
|
|
|
|
long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned int flags,
|
|
bool forbid_cmsg_compat)
|
|
{
|
|
int fput_needed, err;
|
|
struct msghdr msg_sys;
|
|
struct socket *sock;
|
|
|
|
if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
|
|
return -EINVAL;
|
|
|
|
sock = sockfd_lookup_light(fd, &err, &fput_needed);
|
|
if (!sock)
|
|
goto out;
|
|
|
|
err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
|
|
|
|
fput_light(sock->file, fput_needed);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg,
|
|
unsigned int, flags)
|
|
{
|
|
return __sys_recvmsg(fd, msg, flags, true);
|
|
}
|
|
|
|
/*
|
|
* Linux recvmmsg interface
|
|
*/
|
|
|
|
static int do_recvmmsg(int fd, struct mmsghdr __user *mmsg,
|
|
unsigned int vlen, unsigned int flags,
|
|
struct timespec64 *timeout)
|
|
{
|
|
int fput_needed, err, datagrams;
|
|
struct socket *sock;
|
|
struct mmsghdr __user *entry;
|
|
struct compat_mmsghdr __user *compat_entry;
|
|
struct msghdr msg_sys;
|
|
struct timespec64 end_time;
|
|
struct timespec64 timeout64;
|
|
|
|
if (timeout &&
|
|
poll_select_set_timeout(&end_time, timeout->tv_sec,
|
|
timeout->tv_nsec))
|
|
return -EINVAL;
|
|
|
|
datagrams = 0;
|
|
|
|
sock = sockfd_lookup_light(fd, &err, &fput_needed);
|
|
if (!sock)
|
|
return err;
|
|
|
|
if (likely(!(flags & MSG_ERRQUEUE))) {
|
|
err = sock_error(sock->sk);
|
|
if (err) {
|
|
datagrams = err;
|
|
goto out_put;
|
|
}
|
|
}
|
|
|
|
entry = mmsg;
|
|
compat_entry = (struct compat_mmsghdr __user *)mmsg;
|
|
|
|
while (datagrams < vlen) {
|
|
/*
|
|
* No need to ask LSM for more than the first datagram.
|
|
*/
|
|
if (MSG_CMSG_COMPAT & flags) {
|
|
err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry,
|
|
&msg_sys, flags & ~MSG_WAITFORONE,
|
|
datagrams);
|
|
if (err < 0)
|
|
break;
|
|
err = __put_user(err, &compat_entry->msg_len);
|
|
++compat_entry;
|
|
} else {
|
|
err = ___sys_recvmsg(sock,
|
|
(struct user_msghdr __user *)entry,
|
|
&msg_sys, flags & ~MSG_WAITFORONE,
|
|
datagrams);
|
|
if (err < 0)
|
|
break;
|
|
err = put_user(err, &entry->msg_len);
|
|
++entry;
|
|
}
|
|
|
|
if (err)
|
|
break;
|
|
++datagrams;
|
|
|
|
/* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
|
|
if (flags & MSG_WAITFORONE)
|
|
flags |= MSG_DONTWAIT;
|
|
|
|
if (timeout) {
|
|
ktime_get_ts64(&timeout64);
|
|
*timeout = timespec64_sub(end_time, timeout64);
|
|
if (timeout->tv_sec < 0) {
|
|
timeout->tv_sec = timeout->tv_nsec = 0;
|
|
break;
|
|
}
|
|
|
|
/* Timeout, return less than vlen datagrams */
|
|
if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
|
|
break;
|
|
}
|
|
|
|
/* Out of band data, return right away */
|
|
if (msg_sys.msg_flags & MSG_OOB)
|
|
break;
|
|
cond_resched();
|
|
}
|
|
|
|
if (err == 0)
|
|
goto out_put;
|
|
|
|
if (datagrams == 0) {
|
|
datagrams = err;
|
|
goto out_put;
|
|
}
|
|
|
|
/*
|
|
* We may return less entries than requested (vlen) if the
|
|
* sock is non block and there aren't enough datagrams...
|
|
*/
|
|
if (err != -EAGAIN) {
|
|
/*
|
|
* ... or if recvmsg returns an error after we
|
|
* received some datagrams, where we record the
|
|
* error to return on the next call or if the
|
|
* app asks about it using getsockopt(SO_ERROR).
|
|
*/
|
|
sock->sk->sk_err = -err;
|
|
}
|
|
out_put:
|
|
fput_light(sock->file, fput_needed);
|
|
|
|
return datagrams;
|
|
}
|
|
|
|
int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg,
|
|
unsigned int vlen, unsigned int flags,
|
|
struct __kernel_timespec __user *timeout,
|
|
struct old_timespec32 __user *timeout32)
|
|
{
|
|
int datagrams;
|
|
struct timespec64 timeout_sys;
|
|
|
|
if (timeout && get_timespec64(&timeout_sys, timeout))
|
|
return -EFAULT;
|
|
|
|
if (timeout32 && get_old_timespec32(&timeout_sys, timeout32))
|
|
return -EFAULT;
|
|
|
|
if (!timeout && !timeout32)
|
|
return do_recvmmsg(fd, mmsg, vlen, flags, NULL);
|
|
|
|
datagrams = do_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
|
|
|
|
if (datagrams <= 0)
|
|
return datagrams;
|
|
|
|
if (timeout && put_timespec64(&timeout_sys, timeout))
|
|
datagrams = -EFAULT;
|
|
|
|
if (timeout32 && put_old_timespec32(&timeout_sys, timeout32))
|
|
datagrams = -EFAULT;
|
|
|
|
return datagrams;
|
|
}
|
|
|
|
SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
|
|
unsigned int, vlen, unsigned int, flags,
|
|
struct __kernel_timespec __user *, timeout)
|
|
{
|
|
if (flags & MSG_CMSG_COMPAT)
|
|
return -EINVAL;
|
|
|
|
return __sys_recvmmsg(fd, mmsg, vlen, flags, timeout, NULL);
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT_32BIT_TIME
|
|
SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct mmsghdr __user *, mmsg,
|
|
unsigned int, vlen, unsigned int, flags,
|
|
struct old_timespec32 __user *, timeout)
|
|
{
|
|
if (flags & MSG_CMSG_COMPAT)
|
|
return -EINVAL;
|
|
|
|
return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL, timeout);
|
|
}
|
|
#endif
|
|
|
|
#ifdef __ARCH_WANT_SYS_SOCKETCALL
|
|
/* Argument list sizes for sys_socketcall */
|
|
#define AL(x) ((x) * sizeof(unsigned long))
|
|
static const unsigned char nargs[21] = {
|
|
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),
|
|
AL(4), AL(5), AL(4)
|
|
};
|
|
|
|
#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.
|
|
*/
|
|
|
|
SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
|
|
{
|
|
unsigned long a[AUDITSC_ARGS];
|
|
unsigned long a0, a1;
|
|
int err;
|
|
unsigned int len;
|
|
|
|
if (call < 1 || call > SYS_SENDMMSG)
|
|
return -EINVAL;
|
|
call = array_index_nospec(call, SYS_SENDMMSG + 1);
|
|
|
|
len = nargs[call];
|
|
if (len > sizeof(a))
|
|
return -EINVAL;
|
|
|
|
/* copy_from_user should be SMP safe. */
|
|
if (copy_from_user(a, args, len))
|
|
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_accept4(a0, (struct sockaddr __user *)a1,
|
|
(int __user *)a[2], 0);
|
|
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_sendto(a0, (void __user *)a1, a[2], a[3],
|
|
NULL, 0);
|
|
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_recvfrom(a0, (void __user *)a1, a[2], a[3],
|
|
NULL, NULL);
|
|
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 user_msghdr __user *)a1,
|
|
a[2], true);
|
|
break;
|
|
case SYS_SENDMMSG:
|
|
err = __sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2],
|
|
a[3], true);
|
|
break;
|
|
case SYS_RECVMSG:
|
|
err = __sys_recvmsg(a0, (struct user_msghdr __user *)a1,
|
|
a[2], true);
|
|
break;
|
|
case SYS_RECVMMSG:
|
|
if (IS_ENABLED(CONFIG_64BIT))
|
|
err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1,
|
|
a[2], a[3],
|
|
(struct __kernel_timespec __user *)a[4],
|
|
NULL);
|
|
else
|
|
err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1,
|
|
a[2], a[3], NULL,
|
|
(struct old_timespec32 __user *)a[4]);
|
|
break;
|
|
case SYS_ACCEPT4:
|
|
err = __sys_accept4(a0, (struct sockaddr __user *)a1,
|
|
(int __user *)a[2], a[3]);
|
|
break;
|
|
default:
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
#endif /* __ARCH_WANT_SYS_SOCKETCALL */
|
|
|
|
/**
|
|
* sock_register - add a socket protocol handler
|
|
* @ops: description of protocol
|
|
*
|
|
* This function is called by a protocol handler that wants to
|
|
* advertise its address family, and have it linked into the
|
|
* socket interface. The value ops->family corresponds to the
|
|
* socket system call protocol family.
|
|
*/
|
|
int sock_register(const struct net_proto_family *ops)
|
|
{
|
|
int err;
|
|
|
|
if (ops->family >= NPROTO) {
|
|
pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
|
|
return -ENOBUFS;
|
|
}
|
|
|
|
spin_lock(&net_family_lock);
|
|
if (rcu_dereference_protected(net_families[ops->family],
|
|
lockdep_is_held(&net_family_lock)))
|
|
err = -EEXIST;
|
|
else {
|
|
rcu_assign_pointer(net_families[ops->family], ops);
|
|
err = 0;
|
|
}
|
|
spin_unlock(&net_family_lock);
|
|
|
|
pr_info("NET: Registered protocol family %d\n", ops->family);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(sock_register);
|
|
|
|
/**
|
|
* sock_unregister - remove a protocol handler
|
|
* @family: protocol family to remove
|
|
*
|
|
* This function is called by a protocol handler that wants to
|
|
* remove its address family, and have it unlinked from the
|
|
* new socket creation.
|
|
*
|
|
* If protocol handler is a module, then it can use module reference
|
|
* counts to protect against new references. If protocol handler is not
|
|
* a module then it needs to provide its own protection in
|
|
* the ops->create routine.
|
|
*/
|
|
void sock_unregister(int family)
|
|
{
|
|
BUG_ON(family < 0 || family >= NPROTO);
|
|
|
|
spin_lock(&net_family_lock);
|
|
RCU_INIT_POINTER(net_families[family], NULL);
|
|
spin_unlock(&net_family_lock);
|
|
|
|
synchronize_rcu();
|
|
|
|
pr_info("NET: Unregistered protocol family %d\n", family);
|
|
}
|
|
EXPORT_SYMBOL(sock_unregister);
|
|
|
|
bool sock_is_registered(int family)
|
|
{
|
|
return family < NPROTO && rcu_access_pointer(net_families[family]);
|
|
}
|
|
|
|
static int __init sock_init(void)
|
|
{
|
|
int err;
|
|
/*
|
|
* Initialize the network sysctl infrastructure.
|
|
*/
|
|
err = net_sysctl_init();
|
|
if (err)
|
|
goto out;
|
|
|
|
/*
|
|
* Initialize skbuff SLAB cache
|
|
*/
|
|
skb_init();
|
|
|
|
/*
|
|
* Initialize the protocols module.
|
|
*/
|
|
|
|
init_inodecache();
|
|
|
|
err = register_filesystem(&sock_fs_type);
|
|
if (err)
|
|
goto out;
|
|
sock_mnt = kern_mount(&sock_fs_type);
|
|
if (IS_ERR(sock_mnt)) {
|
|
err = PTR_ERR(sock_mnt);
|
|
goto out_mount;
|
|
}
|
|
|
|
/* The real protocol initialization is performed in later initcalls.
|
|
*/
|
|
|
|
#ifdef CONFIG_NETFILTER
|
|
err = netfilter_init();
|
|
if (err)
|
|
goto out;
|
|
#endif
|
|
|
|
ptp_classifier_init();
|
|
|
|
out:
|
|
return err;
|
|
|
|
out_mount:
|
|
unregister_filesystem(&sock_fs_type);
|
|
goto out;
|
|
}
|
|
|
|
core_initcall(sock_init); /* early initcall */
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
void socket_seq_show(struct seq_file *seq)
|
|
{
|
|
seq_printf(seq, "sockets: used %d\n",
|
|
sock_inuse_get(seq->private));
|
|
}
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static int compat_dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
|
|
{
|
|
struct compat_ifconf ifc32;
|
|
struct ifconf ifc;
|
|
int err;
|
|
|
|
if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
|
|
return -EFAULT;
|
|
|
|
ifc.ifc_len = ifc32.ifc_len;
|
|
ifc.ifc_req = compat_ptr(ifc32.ifcbuf);
|
|
|
|
rtnl_lock();
|
|
err = dev_ifconf(net, &ifc, sizeof(struct compat_ifreq));
|
|
rtnl_unlock();
|
|
if (err)
|
|
return err;
|
|
|
|
ifc32.ifc_len = ifc.ifc_len;
|
|
if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
|
|
{
|
|
struct compat_ethtool_rxnfc __user *compat_rxnfc;
|
|
bool convert_in = false, convert_out = false;
|
|
size_t buf_size = 0;
|
|
struct ethtool_rxnfc __user *rxnfc = NULL;
|
|
struct ifreq ifr;
|
|
u32 rule_cnt = 0, actual_rule_cnt;
|
|
u32 ethcmd;
|
|
u32 data;
|
|
int ret;
|
|
|
|
if (get_user(data, &ifr32->ifr_ifru.ifru_data))
|
|
return -EFAULT;
|
|
|
|
compat_rxnfc = compat_ptr(data);
|
|
|
|
if (get_user(ethcmd, &compat_rxnfc->cmd))
|
|
return -EFAULT;
|
|
|
|
/* Most ethtool structures are defined without padding.
|
|
* Unfortunately struct ethtool_rxnfc is an exception.
|
|
*/
|
|
switch (ethcmd) {
|
|
default:
|
|
break;
|
|
case ETHTOOL_GRXCLSRLALL:
|
|
/* Buffer size is variable */
|
|
if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
|
|
return -EFAULT;
|
|
if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
|
|
return -ENOMEM;
|
|
buf_size += rule_cnt * sizeof(u32);
|
|
fallthrough;
|
|
case ETHTOOL_GRXRINGS:
|
|
case ETHTOOL_GRXCLSRLCNT:
|
|
case ETHTOOL_GRXCLSRULE:
|
|
case ETHTOOL_SRXCLSRLINS:
|
|
convert_out = true;
|
|
fallthrough;
|
|
case ETHTOOL_SRXCLSRLDEL:
|
|
buf_size += sizeof(struct ethtool_rxnfc);
|
|
convert_in = true;
|
|
rxnfc = compat_alloc_user_space(buf_size);
|
|
break;
|
|
}
|
|
|
|
if (copy_from_user(&ifr.ifr_name, &ifr32->ifr_name, IFNAMSIZ))
|
|
return -EFAULT;
|
|
|
|
ifr.ifr_data = convert_in ? rxnfc : (void __user *)compat_rxnfc;
|
|
|
|
if (convert_in) {
|
|
/* We expect there to be holes between fs.m_ext and
|
|
* fs.ring_cookie and at the end of fs, but nowhere else.
|
|
*/
|
|
BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
|
|
sizeof(compat_rxnfc->fs.m_ext) !=
|
|
offsetof(struct ethtool_rxnfc, fs.m_ext) +
|
|
sizeof(rxnfc->fs.m_ext));
|
|
BUILD_BUG_ON(
|
|
offsetof(struct compat_ethtool_rxnfc, fs.location) -
|
|
offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
|
|
offsetof(struct ethtool_rxnfc, fs.location) -
|
|
offsetof(struct ethtool_rxnfc, fs.ring_cookie));
|
|
|
|
if (copy_in_user(rxnfc, compat_rxnfc,
|
|
(void __user *)(&rxnfc->fs.m_ext + 1) -
|
|
(void __user *)rxnfc) ||
|
|
copy_in_user(&rxnfc->fs.ring_cookie,
|
|
&compat_rxnfc->fs.ring_cookie,
|
|
(void __user *)(&rxnfc->fs.location + 1) -
|
|
(void __user *)&rxnfc->fs.ring_cookie))
|
|
return -EFAULT;
|
|
if (ethcmd == ETHTOOL_GRXCLSRLALL) {
|
|
if (put_user(rule_cnt, &rxnfc->rule_cnt))
|
|
return -EFAULT;
|
|
} else if (copy_in_user(&rxnfc->rule_cnt,
|
|
&compat_rxnfc->rule_cnt,
|
|
sizeof(rxnfc->rule_cnt)))
|
|
return -EFAULT;
|
|
}
|
|
|
|
ret = dev_ioctl(net, SIOCETHTOOL, &ifr, NULL);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (convert_out) {
|
|
if (copy_in_user(compat_rxnfc, rxnfc,
|
|
(const void __user *)(&rxnfc->fs.m_ext + 1) -
|
|
(const void __user *)rxnfc) ||
|
|
copy_in_user(&compat_rxnfc->fs.ring_cookie,
|
|
&rxnfc->fs.ring_cookie,
|
|
(const void __user *)(&rxnfc->fs.location + 1) -
|
|
(const void __user *)&rxnfc->fs.ring_cookie) ||
|
|
copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
|
|
sizeof(rxnfc->rule_cnt)))
|
|
return -EFAULT;
|
|
|
|
if (ethcmd == ETHTOOL_GRXCLSRLALL) {
|
|
/* As an optimisation, we only copy the actual
|
|
* number of rules that the underlying
|
|
* function returned. Since Mallory might
|
|
* change the rule count in user memory, we
|
|
* check that it is less than the rule count
|
|
* originally given (as the user buffer size),
|
|
* which has been range-checked.
|
|
*/
|
|
if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
|
|
return -EFAULT;
|
|
if (actual_rule_cnt < rule_cnt)
|
|
rule_cnt = actual_rule_cnt;
|
|
if (copy_in_user(&compat_rxnfc->rule_locs[0],
|
|
&rxnfc->rule_locs[0],
|
|
rule_cnt * sizeof(u32)))
|
|
return -EFAULT;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
|
|
{
|
|
compat_uptr_t uptr32;
|
|
struct ifreq ifr;
|
|
void __user *saved;
|
|
int err;
|
|
|
|
if (copy_from_user(&ifr, uifr32, sizeof(struct compat_ifreq)))
|
|
return -EFAULT;
|
|
|
|
if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
|
|
return -EFAULT;
|
|
|
|
saved = ifr.ifr_settings.ifs_ifsu.raw_hdlc;
|
|
ifr.ifr_settings.ifs_ifsu.raw_hdlc = compat_ptr(uptr32);
|
|
|
|
err = dev_ioctl(net, SIOCWANDEV, &ifr, NULL);
|
|
if (!err) {
|
|
ifr.ifr_settings.ifs_ifsu.raw_hdlc = saved;
|
|
if (copy_to_user(uifr32, &ifr, sizeof(struct compat_ifreq)))
|
|
err = -EFAULT;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
|
|
static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd,
|
|
struct compat_ifreq __user *u_ifreq32)
|
|
{
|
|
struct ifreq ifreq;
|
|
u32 data32;
|
|
|
|
if (copy_from_user(ifreq.ifr_name, u_ifreq32->ifr_name, IFNAMSIZ))
|
|
return -EFAULT;
|
|
if (get_user(data32, &u_ifreq32->ifr_data))
|
|
return -EFAULT;
|
|
ifreq.ifr_data = compat_ptr(data32);
|
|
|
|
return dev_ioctl(net, cmd, &ifreq, NULL);
|
|
}
|
|
|
|
static int compat_ifreq_ioctl(struct net *net, struct socket *sock,
|
|
unsigned int cmd,
|
|
struct compat_ifreq __user *uifr32)
|
|
{
|
|
struct ifreq __user *uifr;
|
|
int err;
|
|
|
|
/* Handle the fact that while struct ifreq has the same *layout* on
|
|
* 32/64 for everything but ifreq::ifru_ifmap and ifreq::ifru_data,
|
|
* which are handled elsewhere, it still has different *size* due to
|
|
* ifreq::ifru_ifmap (which is 16 bytes on 32 bit, 24 bytes on 64-bit,
|
|
* resulting in struct ifreq being 32 and 40 bytes respectively).
|
|
* As a result, if the struct happens to be at the end of a page and
|
|
* the next page isn't readable/writable, we get a fault. To prevent
|
|
* that, copy back and forth to the full size.
|
|
*/
|
|
|
|
uifr = compat_alloc_user_space(sizeof(*uifr));
|
|
if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
|
|
return -EFAULT;
|
|
|
|
err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
|
|
|
|
if (!err) {
|
|
switch (cmd) {
|
|
case SIOCGIFFLAGS:
|
|
case SIOCGIFMETRIC:
|
|
case SIOCGIFMTU:
|
|
case SIOCGIFMEM:
|
|
case SIOCGIFHWADDR:
|
|
case SIOCGIFINDEX:
|
|
case SIOCGIFADDR:
|
|
case SIOCGIFBRDADDR:
|
|
case SIOCGIFDSTADDR:
|
|
case SIOCGIFNETMASK:
|
|
case SIOCGIFPFLAGS:
|
|
case SIOCGIFTXQLEN:
|
|
case SIOCGMIIPHY:
|
|
case SIOCGMIIREG:
|
|
case SIOCGIFNAME:
|
|
if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
|
|
struct compat_ifreq __user *uifr32)
|
|
{
|
|
struct ifreq ifr;
|
|
struct compat_ifmap __user *uifmap32;
|
|
int err;
|
|
|
|
uifmap32 = &uifr32->ifr_ifru.ifru_map;
|
|
err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
|
|
err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
|
|
err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
|
|
err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
|
|
err |= get_user(ifr.ifr_map.irq, &uifmap32->irq);
|
|
err |= get_user(ifr.ifr_map.dma, &uifmap32->dma);
|
|
err |= get_user(ifr.ifr_map.port, &uifmap32->port);
|
|
if (err)
|
|
return -EFAULT;
|
|
|
|
err = dev_ioctl(net, cmd, &ifr, NULL);
|
|
|
|
if (cmd == SIOCGIFMAP && !err) {
|
|
err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
|
|
err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
|
|
err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
|
|
err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
|
|
err |= put_user(ifr.ifr_map.irq, &uifmap32->irq);
|
|
err |= put_user(ifr.ifr_map.dma, &uifmap32->dma);
|
|
err |= put_user(ifr.ifr_map.port, &uifmap32->port);
|
|
if (err)
|
|
err = -EFAULT;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
|
|
* for some operations; this forces use of the newer bridge-utils that
|
|
* use compatible ioctls
|
|
*/
|
|
static int old_bridge_ioctl(compat_ulong_t __user *argp)
|
|
{
|
|
compat_ulong_t tmp;
|
|
|
|
if (get_user(tmp, argp))
|
|
return -EFAULT;
|
|
if (tmp == BRCTL_GET_VERSION)
|
|
return BRCTL_VERSION + 1;
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
void __user *argp = compat_ptr(arg);
|
|
struct sock *sk = sock->sk;
|
|
struct net *net = sock_net(sk);
|
|
|
|
if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
|
|
return compat_ifr_data_ioctl(net, cmd, argp);
|
|
|
|
switch (cmd) {
|
|
case SIOCSIFBR:
|
|
case SIOCGIFBR:
|
|
return old_bridge_ioctl(argp);
|
|
case SIOCGIFCONF:
|
|
return compat_dev_ifconf(net, argp);
|
|
case SIOCETHTOOL:
|
|
return ethtool_ioctl(net, argp);
|
|
case SIOCWANDEV:
|
|
return compat_siocwandev(net, argp);
|
|
case SIOCGIFMAP:
|
|
case SIOCSIFMAP:
|
|
return compat_sioc_ifmap(net, cmd, argp);
|
|
case SIOCGSTAMP_OLD:
|
|
case SIOCGSTAMPNS_OLD:
|
|
if (!sock->ops->gettstamp)
|
|
return -ENOIOCTLCMD;
|
|
return sock->ops->gettstamp(sock, argp, cmd == SIOCGSTAMP_OLD,
|
|
!COMPAT_USE_64BIT_TIME);
|
|
|
|
case SIOCBONDSLAVEINFOQUERY:
|
|
case SIOCBONDINFOQUERY:
|
|
case SIOCSHWTSTAMP:
|
|
case SIOCGHWTSTAMP:
|
|
return compat_ifr_data_ioctl(net, cmd, argp);
|
|
|
|
case FIOSETOWN:
|
|
case SIOCSPGRP:
|
|
case FIOGETOWN:
|
|
case SIOCGPGRP:
|
|
case SIOCBRADDBR:
|
|
case SIOCBRDELBR:
|
|
case SIOCGIFVLAN:
|
|
case SIOCSIFVLAN:
|
|
case SIOCGSKNS:
|
|
case SIOCGSTAMP_NEW:
|
|
case SIOCGSTAMPNS_NEW:
|
|
return sock_ioctl(file, cmd, arg);
|
|
|
|
case SIOCGIFFLAGS:
|
|
case SIOCSIFFLAGS:
|
|
case SIOCGIFMETRIC:
|
|
case SIOCSIFMETRIC:
|
|
case SIOCGIFMTU:
|
|
case SIOCSIFMTU:
|
|
case SIOCGIFMEM:
|
|
case SIOCSIFMEM:
|
|
case SIOCGIFHWADDR:
|
|
case SIOCSIFHWADDR:
|
|
case SIOCADDMULTI:
|
|
case SIOCDELMULTI:
|
|
case SIOCGIFINDEX:
|
|
case SIOCGIFADDR:
|
|
case SIOCSIFADDR:
|
|
case SIOCSIFHWBROADCAST:
|
|
case SIOCDIFADDR:
|
|
case SIOCGIFBRDADDR:
|
|
case SIOCSIFBRDADDR:
|
|
case SIOCGIFDSTADDR:
|
|
case SIOCSIFDSTADDR:
|
|
case SIOCGIFNETMASK:
|
|
case SIOCSIFNETMASK:
|
|
case SIOCSIFPFLAGS:
|
|
case SIOCGIFPFLAGS:
|
|
case SIOCGIFTXQLEN:
|
|
case SIOCSIFTXQLEN:
|
|
case SIOCBRADDIF:
|
|
case SIOCBRDELIF:
|
|
case SIOCGIFNAME:
|
|
case SIOCSIFNAME:
|
|
case SIOCGMIIPHY:
|
|
case SIOCGMIIREG:
|
|
case SIOCSMIIREG:
|
|
case SIOCBONDENSLAVE:
|
|
case SIOCBONDRELEASE:
|
|
case SIOCBONDSETHWADDR:
|
|
case SIOCBONDCHANGEACTIVE:
|
|
return compat_ifreq_ioctl(net, sock, cmd, argp);
|
|
|
|
case SIOCSARP:
|
|
case SIOCGARP:
|
|
case SIOCDARP:
|
|
case SIOCOUTQ:
|
|
case SIOCOUTQNSD:
|
|
case SIOCATMARK:
|
|
return sock_do_ioctl(net, sock, cmd, arg);
|
|
}
|
|
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
|
|
static long compat_sock_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct socket *sock = file->private_data;
|
|
int ret = -ENOIOCTLCMD;
|
|
struct sock *sk;
|
|
struct net *net;
|
|
|
|
sk = sock->sk;
|
|
net = sock_net(sk);
|
|
|
|
if (sock->ops->compat_ioctl)
|
|
ret = sock->ops->compat_ioctl(sock, cmd, arg);
|
|
|
|
if (ret == -ENOIOCTLCMD &&
|
|
(cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
|
|
ret = compat_wext_handle_ioctl(net, cmd, arg);
|
|
|
|
if (ret == -ENOIOCTLCMD)
|
|
ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
|
|
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* kernel_bind - bind an address to a socket (kernel space)
|
|
* @sock: socket
|
|
* @addr: address
|
|
* @addrlen: length of address
|
|
*
|
|
* Returns 0 or an error.
|
|
*/
|
|
|
|
int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
|
|
{
|
|
return sock->ops->bind(sock, addr, addrlen);
|
|
}
|
|
EXPORT_SYMBOL(kernel_bind);
|
|
|
|
/**
|
|
* kernel_listen - move socket to listening state (kernel space)
|
|
* @sock: socket
|
|
* @backlog: pending connections queue size
|
|
*
|
|
* Returns 0 or an error.
|
|
*/
|
|
|
|
int kernel_listen(struct socket *sock, int backlog)
|
|
{
|
|
return sock->ops->listen(sock, backlog);
|
|
}
|
|
EXPORT_SYMBOL(kernel_listen);
|
|
|
|
/**
|
|
* kernel_accept - accept a connection (kernel space)
|
|
* @sock: listening socket
|
|
* @newsock: new connected socket
|
|
* @flags: flags
|
|
*
|
|
* @flags must be SOCK_CLOEXEC, SOCK_NONBLOCK or 0.
|
|
* If it fails, @newsock is guaranteed to be %NULL.
|
|
* Returns 0 or an error.
|
|
*/
|
|
|
|
int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int err;
|
|
|
|
err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
|
|
newsock);
|
|
if (err < 0)
|
|
goto done;
|
|
|
|
err = sock->ops->accept(sock, *newsock, flags, true);
|
|
if (err < 0) {
|
|
sock_release(*newsock);
|
|
*newsock = NULL;
|
|
goto done;
|
|
}
|
|
|
|
(*newsock)->ops = sock->ops;
|
|
__module_get((*newsock)->ops->owner);
|
|
|
|
done:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(kernel_accept);
|
|
|
|
/**
|
|
* kernel_connect - connect a socket (kernel space)
|
|
* @sock: socket
|
|
* @addr: address
|
|
* @addrlen: address length
|
|
* @flags: flags (O_NONBLOCK, ...)
|
|
*
|
|
* For datagram sockets, @addr is the addres to which datagrams are sent
|
|
* by default, and the only address from which datagrams are received.
|
|
* For stream sockets, attempts to connect to @addr.
|
|
* Returns 0 or an error code.
|
|
*/
|
|
|
|
int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
|
|
int flags)
|
|
{
|
|
return sock->ops->connect(sock, addr, addrlen, flags);
|
|
}
|
|
EXPORT_SYMBOL(kernel_connect);
|
|
|
|
/**
|
|
* kernel_getsockname - get the address which the socket is bound (kernel space)
|
|
* @sock: socket
|
|
* @addr: address holder
|
|
*
|
|
* Fills the @addr pointer with the address which the socket is bound.
|
|
* Returns 0 or an error code.
|
|
*/
|
|
|
|
int kernel_getsockname(struct socket *sock, struct sockaddr *addr)
|
|
{
|
|
return sock->ops->getname(sock, addr, 0);
|
|
}
|
|
EXPORT_SYMBOL(kernel_getsockname);
|
|
|
|
/**
|
|
* kernel_getpeername - get the address which the socket is connected (kernel space)
|
|
* @sock: socket
|
|
* @addr: address holder
|
|
*
|
|
* Fills the @addr pointer with the address which the socket is connected.
|
|
* Returns 0 or an error code.
|
|
*/
|
|
|
|
int kernel_getpeername(struct socket *sock, struct sockaddr *addr)
|
|
{
|
|
return sock->ops->getname(sock, addr, 1);
|
|
}
|
|
EXPORT_SYMBOL(kernel_getpeername);
|
|
|
|
/**
|
|
* kernel_sendpage - send a &page through a socket (kernel space)
|
|
* @sock: socket
|
|
* @page: page
|
|
* @offset: page offset
|
|
* @size: total size in bytes
|
|
* @flags: flags (MSG_DONTWAIT, ...)
|
|
*
|
|
* Returns the total amount sent in bytes or an error.
|
|
*/
|
|
|
|
int kernel_sendpage(struct socket *sock, struct page *page, int offset,
|
|
size_t size, int flags)
|
|
{
|
|
if (sock->ops->sendpage) {
|
|
/* Warn in case the improper page to zero-copy send */
|
|
WARN_ONCE(!sendpage_ok(page), "improper page for zero-copy send");
|
|
return sock->ops->sendpage(sock, page, offset, size, flags);
|
|
}
|
|
return sock_no_sendpage(sock, page, offset, size, flags);
|
|
}
|
|
EXPORT_SYMBOL(kernel_sendpage);
|
|
|
|
/**
|
|
* kernel_sendpage_locked - send a &page through the locked sock (kernel space)
|
|
* @sk: sock
|
|
* @page: page
|
|
* @offset: page offset
|
|
* @size: total size in bytes
|
|
* @flags: flags (MSG_DONTWAIT, ...)
|
|
*
|
|
* Returns the total amount sent in bytes or an error.
|
|
* Caller must hold @sk.
|
|
*/
|
|
|
|
int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset,
|
|
size_t size, int flags)
|
|
{
|
|
struct socket *sock = sk->sk_socket;
|
|
|
|
if (sock->ops->sendpage_locked)
|
|
return sock->ops->sendpage_locked(sk, page, offset, size,
|
|
flags);
|
|
|
|
return sock_no_sendpage_locked(sk, page, offset, size, flags);
|
|
}
|
|
EXPORT_SYMBOL(kernel_sendpage_locked);
|
|
|
|
/**
|
|
* kernel_sock_shutdown - shut down part of a full-duplex connection (kernel space)
|
|
* @sock: socket
|
|
* @how: connection part
|
|
*
|
|
* Returns 0 or an error.
|
|
*/
|
|
|
|
int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
|
|
{
|
|
return sock->ops->shutdown(sock, how);
|
|
}
|
|
EXPORT_SYMBOL(kernel_sock_shutdown);
|
|
|
|
/**
|
|
* kernel_sock_ip_overhead - returns the IP overhead imposed by a socket
|
|
* @sk: socket
|
|
*
|
|
* This routine returns the IP overhead imposed by a socket i.e.
|
|
* the length of the underlying IP header, depending on whether
|
|
* this is an IPv4 or IPv6 socket and the length from IP options turned
|
|
* on at the socket. Assumes that the caller has a lock on the socket.
|
|
*/
|
|
|
|
u32 kernel_sock_ip_overhead(struct sock *sk)
|
|
{
|
|
struct inet_sock *inet;
|
|
struct ip_options_rcu *opt;
|
|
u32 overhead = 0;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
struct ipv6_pinfo *np;
|
|
struct ipv6_txoptions *optv6 = NULL;
|
|
#endif /* IS_ENABLED(CONFIG_IPV6) */
|
|
|
|
if (!sk)
|
|
return overhead;
|
|
|
|
switch (sk->sk_family) {
|
|
case AF_INET:
|
|
inet = inet_sk(sk);
|
|
overhead += sizeof(struct iphdr);
|
|
opt = rcu_dereference_protected(inet->inet_opt,
|
|
sock_owned_by_user(sk));
|
|
if (opt)
|
|
overhead += opt->opt.optlen;
|
|
return overhead;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
case AF_INET6:
|
|
np = inet6_sk(sk);
|
|
overhead += sizeof(struct ipv6hdr);
|
|
if (np)
|
|
optv6 = rcu_dereference_protected(np->opt,
|
|
sock_owned_by_user(sk));
|
|
if (optv6)
|
|
overhead += (optv6->opt_flen + optv6->opt_nflen);
|
|
return overhead;
|
|
#endif /* IS_ENABLED(CONFIG_IPV6) */
|
|
default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */
|
|
return overhead;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(kernel_sock_ip_overhead);
|