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3596 lines
87 KiB
3596 lines
87 KiB
// 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, <[email protected]> |
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* Ross Biro |
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* Fred N. van Kempen, <[email protected]> |
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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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|
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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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|
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#include <linux/uaccess.h> |
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#include <asm/unistd.h> |
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|
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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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|
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#include <net/sock.h> |
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#include <linux/netfilter.h> |
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|
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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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#include <linux/ptp_clock_kernel.h> |
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|
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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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|
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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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|
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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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/* |
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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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|
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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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static const char * const pf_family_names[] = { |
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[PF_UNSPEC] = "PF_UNSPEC", |
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[PF_UNIX] = "PF_UNIX/PF_LOCAL", |
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[PF_INET] = "PF_INET", |
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[PF_AX25] = "PF_AX25", |
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[PF_IPX] = "PF_IPX", |
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[PF_APPLETALK] = "PF_APPLETALK", |
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[PF_NETROM] = "PF_NETROM", |
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[PF_BRIDGE] = "PF_BRIDGE", |
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[PF_ATMPVC] = "PF_ATMPVC", |
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[PF_X25] = "PF_X25", |
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[PF_INET6] = "PF_INET6", |
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[PF_ROSE] = "PF_ROSE", |
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[PF_DECnet] = "PF_DECnet", |
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[PF_NETBEUI] = "PF_NETBEUI", |
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[PF_SECURITY] = "PF_SECURITY", |
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[PF_KEY] = "PF_KEY", |
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[PF_NETLINK] = "PF_NETLINK/PF_ROUTE", |
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[PF_PACKET] = "PF_PACKET", |
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[PF_ASH] = "PF_ASH", |
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[PF_ECONET] = "PF_ECONET", |
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[PF_ATMSVC] = "PF_ATMSVC", |
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[PF_RDS] = "PF_RDS", |
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[PF_SNA] = "PF_SNA", |
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[PF_IRDA] = "PF_IRDA", |
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[PF_PPPOX] = "PF_PPPOX", |
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[PF_WANPIPE] = "PF_WANPIPE", |
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[PF_LLC] = "PF_LLC", |
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[PF_IB] = "PF_IB", |
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[PF_MPLS] = "PF_MPLS", |
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[PF_CAN] = "PF_CAN", |
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[PF_TIPC] = "PF_TIPC", |
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[PF_BLUETOOTH] = "PF_BLUETOOTH", |
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[PF_IUCV] = "PF_IUCV", |
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[PF_RXRPC] = "PF_RXRPC", |
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[PF_ISDN] = "PF_ISDN", |
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[PF_PHONET] = "PF_PHONET", |
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[PF_IEEE802154] = "PF_IEEE802154", |
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[PF_CAIF] = "PF_CAIF", |
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[PF_ALG] = "PF_ALG", |
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[PF_NFC] = "PF_NFC", |
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[PF_VSOCK] = "PF_VSOCK", |
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[PF_KCM] = "PF_KCM", |
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[PF_QIPCRTR] = "PF_QIPCRTR", |
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[PF_SMC] = "PF_SMC", |
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[PF_XDP] = "PF_XDP", |
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[PF_MCTP] = "PF_MCTP", |
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}; |
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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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|
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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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/* |
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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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/** |
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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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|
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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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|
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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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/* |
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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 user_namespace *mnt_userns, |
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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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|
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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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/* |
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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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/** |
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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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|
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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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|
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if (!dname) |
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dname = sock->sk ? sock->sk->sk_prot_creator->name : ""; |
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|
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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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|
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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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|
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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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|
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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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|
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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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/** |
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* sock_from_file - Return the &socket bounded to @file. |
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* @file: file |
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* |
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* On failure returns %NULL. |
|
*/ |
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|
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struct socket *sock_from_file(struct file *file) |
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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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|
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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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/** |
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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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|
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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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sock = sock_from_file(file); |
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if (!sock) { |
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*err = -ENOTSOCK; |
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fput(file); |
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} |
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return sock; |
|
} |
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EXPORT_SYMBOL(sockfd_lookup); |
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|
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static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) |
|
{ |
|
struct fd f = fdget(fd); |
|
struct socket *sock; |
|
|
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*err = -EBADF; |
|
if (f.file) { |
|
sock = sock_from_file(f.file); |
|
if (likely(sock)) { |
|
*fput_needed = f.flags & FDPUT_FPUT; |
|
return sock; |
|
} |
|
*err = -ENOTSOCK; |
|
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 user_namespace *mnt_userns, |
|
struct dentry *dentry, struct iattr *iattr) |
|
{ |
|
int err = simple_setattr(&init_user_ns, 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)) { |
|
if (sk->sk_tsflags & SOF_TIMESTAMPING_BIND_PHC) |
|
ptp_convert_timestamp(shhwtstamps, sk->sk_bind_phc); |
|
|
|
if (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 *net, struct net_bridge *br, |
|
unsigned int cmd, struct ifreq *ifr, |
|
void __user *uarg); |
|
|
|
void brioctl_set(int (*hook)(struct net *net, struct net_bridge *br, |
|
unsigned int cmd, struct ifreq *ifr, |
|
void __user *uarg)) |
|
{ |
|
mutex_lock(&br_ioctl_mutex); |
|
br_ioctl_hook = hook; |
|
mutex_unlock(&br_ioctl_mutex); |
|
} |
|
EXPORT_SYMBOL(brioctl_set); |
|
|
|
int br_ioctl_call(struct net *net, struct net_bridge *br, unsigned int cmd, |
|
struct ifreq *ifr, void __user *uarg) |
|
{ |
|
int err = -ENOPKG; |
|
|
|
if (!br_ioctl_hook) |
|
request_module("bridge"); |
|
|
|
mutex_lock(&br_ioctl_mutex); |
|
if (br_ioctl_hook) |
|
err = br_ioctl_hook(net, br, cmd, ifr, uarg); |
|
mutex_unlock(&br_ioctl_mutex); |
|
|
|
return err; |
|
} |
|
|
|
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) |
|
{ |
|
struct ifreq ifr; |
|
bool need_copyout; |
|
int err; |
|
void __user *argp = (void __user *)arg; |
|
void __user *data; |
|
|
|
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 (!is_socket_ioctl_cmd(cmd)) |
|
return -ENOTTY; |
|
|
|
if (get_user_ifreq(&ifr, &data, argp)) |
|
return -EFAULT; |
|
err = dev_ioctl(net, cmd, &ifr, data, &need_copyout); |
|
if (!err && need_copyout) |
|
if (put_user_ifreq(&ifr, argp)) |
|
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. |
|
*/ |
|
|
|
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; |
|
void __user *data; |
|
bool need_copyout; |
|
if (get_user_ifreq(&ifr, &data, argp)) |
|
return -EFAULT; |
|
err = dev_ioctl(net, cmd, &ifr, data, &need_copyout); |
|
if (!err && need_copyout) |
|
if (put_user_ifreq(&ifr, argp)) |
|
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 = br_ioctl_call(net, NULL, cmd, NULL, argp); |
|
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; |
|
|
|
case SIOCGIFCONF: |
|
err = dev_ifconf(net, argp); |
|
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); |
|
} |
|
|
|
struct file *do_accept(struct file *file, unsigned file_flags, |
|
struct sockaddr __user *upeer_sockaddr, |
|
int __user *upeer_addrlen, int flags) |
|
{ |
|
struct socket *sock, *newsock; |
|
struct file *newfile; |
|
int err, len; |
|
struct sockaddr_storage address; |
|
|
|
sock = sock_from_file(file); |
|
if (!sock) |
|
return ERR_PTR(-ENOTSOCK); |
|
|
|
newsock = sock_alloc(); |
|
if (!newsock) |
|
return ERR_PTR(-ENFILE); |
|
|
|
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); |
|
|
|
newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name); |
|
if (IS_ERR(newfile)) |
|
return newfile; |
|
|
|
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. */ |
|
return newfile; |
|
out_fd: |
|
fput(newfile); |
|
return ERR_PTR(err); |
|
} |
|
|
|
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 file *newfile; |
|
int newfd; |
|
|
|
if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
|
return -EINVAL; |
|
|
|
if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) |
|
flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; |
|
|
|
newfd = __get_unused_fd_flags(flags, nofile); |
|
if (unlikely(newfd < 0)) |
|
return newfd; |
|
|
|
newfile = do_accept(file, file_flags, upeer_sockaddr, upeer_addrlen, |
|
flags); |
|
if (IS_ERR(newfile)) { |
|
put_unused_fd(newfd); |
|
return PTR_ERR(newfile); |
|
} |
|
fd_install(newfd, newfile); |
|
return newfd; |
|
} |
|
|
|
/* |
|
* 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); |
|
if (!sock) { |
|
err = -ENOTSOCK; |
|
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); |
|
} |
|
|
|
INDIRECT_CALLABLE_DECLARE(bool tcp_bpf_bypass_getsockopt(int level, |
|
int optname)); |
|
|
|
/* |
|
* 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_sock(struct socket *sock, int how) |
|
{ |
|
int err; |
|
|
|
err = security_socket_shutdown(sock, how); |
|
if (!err) |
|
err = sock->ops->shutdown(sock, how); |
|
|
|
return err; |
|
} |
|
|
|
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 = __sys_shutdown_sock(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) |
|
{ |
|
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) |
|
{ |
|
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 %s protocol family\n", pf_family_names[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 %s protocol family\n", pf_family_names[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 */ |
|
|
|
/* 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. |
|
*/ |
|
int get_user_ifreq(struct ifreq *ifr, void __user **ifrdata, void __user *arg) |
|
{ |
|
if (in_compat_syscall()) { |
|
struct compat_ifreq *ifr32 = (struct compat_ifreq *)ifr; |
|
|
|
memset(ifr, 0, sizeof(*ifr)); |
|
if (copy_from_user(ifr32, arg, sizeof(*ifr32))) |
|
return -EFAULT; |
|
|
|
if (ifrdata) |
|
*ifrdata = compat_ptr(ifr32->ifr_data); |
|
|
|
return 0; |
|
} |
|
|
|
if (copy_from_user(ifr, arg, sizeof(*ifr))) |
|
return -EFAULT; |
|
|
|
if (ifrdata) |
|
*ifrdata = ifr->ifr_data; |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(get_user_ifreq); |
|
|
|
int put_user_ifreq(struct ifreq *ifr, void __user *arg) |
|
{ |
|
size_t size = sizeof(*ifr); |
|
|
|
if (in_compat_syscall()) |
|
size = sizeof(struct compat_ifreq); |
|
|
|
if (copy_to_user(arg, ifr, size)) |
|
return -EFAULT; |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(put_user_ifreq); |
|
|
|
#ifdef CONFIG_COMPAT |
|
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 (get_user_ifreq(&ifr, NULL, uifr32)) |
|
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, NULL); |
|
if (!err) { |
|
ifr.ifr_settings.ifs_ifsu.raw_hdlc = saved; |
|
if (put_user_ifreq(&ifr, uifr32)) |
|
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; |
|
void __user *data; |
|
|
|
if (!is_socket_ioctl_cmd(cmd)) |
|
return -ENOTTY; |
|
if (get_user_ifreq(&ifreq, &data, u_ifreq32)) |
|
return -EFAULT; |
|
ifreq.ifr_data = data; |
|
|
|
return dev_ioctl(net, cmd, &ifreq, data, NULL); |
|
} |
|
|
|
/* 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 sock_ioctl(file, cmd, (unsigned long)argp); |
|
|
|
switch (cmd) { |
|
case SIOCSIFBR: |
|
case SIOCGIFBR: |
|
return old_bridge_ioctl(argp); |
|
case SIOCWANDEV: |
|
return compat_siocwandev(net, 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 SIOCETHTOOL: |
|
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: |
|
case SIOCGIFCONF: |
|
return sock_ioctl(file, cmd, arg); |
|
|
|
case SIOCGIFFLAGS: |
|
case SIOCSIFFLAGS: |
|
case SIOCGIFMAP: |
|
case SIOCSIFMAP: |
|
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: |
|
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 address 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);
|
|
|