11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * NET An implementation of the SOCKET network access protocol. 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Version: @(#)socket.c 1.1.93 18/02/95 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Authors: Orest Zborowski, <obz@Kodak.COM> 702c30a84SJesper Juhl * Ross Biro 81da177e4SLinus Torvalds * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * Fixes: 111da177e4SLinus Torvalds * Anonymous : NOTSOCK/BADF cleanup. Error fix in 121da177e4SLinus Torvalds * shutdown() 131da177e4SLinus Torvalds * Alan Cox : verify_area() fixes 141da177e4SLinus Torvalds * Alan Cox : Removed DDI 151da177e4SLinus Torvalds * Jonathan Kamens : SOCK_DGRAM reconnect bug 161da177e4SLinus Torvalds * Alan Cox : Moved a load of checks to the very 171da177e4SLinus Torvalds * top level. 181da177e4SLinus Torvalds * Alan Cox : Move address structures to/from user 191da177e4SLinus Torvalds * mode above the protocol layers. 201da177e4SLinus Torvalds * Rob Janssen : Allow 0 length sends. 211da177e4SLinus Torvalds * Alan Cox : Asynchronous I/O support (cribbed from the 221da177e4SLinus Torvalds * tty drivers). 231da177e4SLinus Torvalds * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style) 241da177e4SLinus Torvalds * Jeff Uphoff : Made max number of sockets command-line 251da177e4SLinus Torvalds * configurable. 261da177e4SLinus Torvalds * Matti Aarnio : Made the number of sockets dynamic, 271da177e4SLinus Torvalds * to be allocated when needed, and mr. 281da177e4SLinus Torvalds * Uphoff's max is used as max to be 291da177e4SLinus Torvalds * allowed to allocate. 301da177e4SLinus Torvalds * Linus : Argh. removed all the socket allocation 311da177e4SLinus Torvalds * altogether: it's in the inode now. 321da177e4SLinus Torvalds * Alan Cox : Made sock_alloc()/sock_release() public 331da177e4SLinus Torvalds * for NetROM and future kernel nfsd type 341da177e4SLinus Torvalds * stuff. 351da177e4SLinus Torvalds * Alan Cox : sendmsg/recvmsg basics. 361da177e4SLinus Torvalds * Tom Dyas : Export net symbols. 371da177e4SLinus Torvalds * Marcin Dalecki : Fixed problems with CONFIG_NET="n". 381da177e4SLinus Torvalds * Alan Cox : Added thread locking to sys_* calls 391da177e4SLinus Torvalds * for sockets. May have errors at the 401da177e4SLinus Torvalds * moment. 411da177e4SLinus Torvalds * Kevin Buhr : Fixed the dumb errors in the above. 421da177e4SLinus Torvalds * Andi Kleen : Some small cleanups, optimizations, 431da177e4SLinus Torvalds * and fixed a copy_from_user() bug. 441da177e4SLinus Torvalds * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0) 451da177e4SLinus Torvalds * Tigran Aivazian : Made listen(2) backlog sanity checks 461da177e4SLinus Torvalds * protocol-independent 471da177e4SLinus Torvalds * 481da177e4SLinus Torvalds * 491da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 501da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 511da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 521da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 531da177e4SLinus Torvalds * 541da177e4SLinus Torvalds * 551da177e4SLinus Torvalds * This module is effectively the top level interface to the BSD socket 561da177e4SLinus Torvalds * paradigm. 571da177e4SLinus Torvalds * 581da177e4SLinus Torvalds * Based upon Swansea University Computer Society NET3.039 591da177e4SLinus Torvalds */ 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds #include <linux/mm.h> 621da177e4SLinus Torvalds #include <linux/socket.h> 631da177e4SLinus Torvalds #include <linux/file.h> 641da177e4SLinus Torvalds #include <linux/net.h> 651da177e4SLinus Torvalds #include <linux/interrupt.h> 6655737fdaSStephen Hemminger #include <linux/rcupdate.h> 671da177e4SLinus Torvalds #include <linux/netdevice.h> 681da177e4SLinus Torvalds #include <linux/proc_fs.h> 691da177e4SLinus Torvalds #include <linux/seq_file.h> 704a3e2f71SArjan van de Ven #include <linux/mutex.h> 711da177e4SLinus Torvalds #include <linux/wanrouter.h> 721da177e4SLinus Torvalds #include <linux/if_bridge.h> 7320380731SArnaldo Carvalho de Melo #include <linux/if_frad.h> 7420380731SArnaldo Carvalho de Melo #include <linux/if_vlan.h> 751da177e4SLinus Torvalds #include <linux/init.h> 761da177e4SLinus Torvalds #include <linux/poll.h> 771da177e4SLinus Torvalds #include <linux/cache.h> 781da177e4SLinus Torvalds #include <linux/module.h> 791da177e4SLinus Torvalds #include <linux/highmem.h> 801da177e4SLinus Torvalds #include <linux/mount.h> 811da177e4SLinus Torvalds #include <linux/security.h> 821da177e4SLinus Torvalds #include <linux/syscalls.h> 831da177e4SLinus Torvalds #include <linux/compat.h> 841da177e4SLinus Torvalds #include <linux/kmod.h> 853ec3b2fbSDavid Woodhouse #include <linux/audit.h> 86d86b5e0eSAdrian Bunk #include <linux/wireless.h> 871b8d7ae4SEric W. Biederman #include <linux/nsproxy.h> 881da177e4SLinus Torvalds 891da177e4SLinus Torvalds #include <asm/uaccess.h> 901da177e4SLinus Torvalds #include <asm/unistd.h> 911da177e4SLinus Torvalds 921da177e4SLinus Torvalds #include <net/compat.h> 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds #include <net/sock.h> 951da177e4SLinus Torvalds #include <linux/netfilter.h> 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds static int sock_no_open(struct inode *irrelevant, struct file *dontcare); 98027445c3SBadari Pulavarty static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov, 99027445c3SBadari Pulavarty unsigned long nr_segs, loff_t pos); 100027445c3SBadari Pulavarty static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov, 101027445c3SBadari Pulavarty unsigned long nr_segs, loff_t pos); 1021da177e4SLinus Torvalds static int sock_mmap(struct file *file, struct vm_area_struct *vma); 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds static int sock_close(struct inode *inode, struct file *file); 1051da177e4SLinus Torvalds static unsigned int sock_poll(struct file *file, 1061da177e4SLinus Torvalds struct poll_table_struct *wait); 10789bddce5SStephen Hemminger static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 10889bbfc95SShaun Pereira #ifdef CONFIG_COMPAT 10989bbfc95SShaun Pereira static long compat_sock_ioctl(struct file *file, 11089bbfc95SShaun Pereira unsigned int cmd, unsigned long arg); 11189bbfc95SShaun Pereira #endif 1121da177e4SLinus Torvalds static int sock_fasync(int fd, struct file *filp, int on); 1131da177e4SLinus Torvalds static ssize_t sock_sendpage(struct file *file, struct page *page, 1141da177e4SLinus Torvalds int offset, size_t size, loff_t *ppos, int more); 1159c55e01cSJens Axboe static ssize_t sock_splice_read(struct file *file, loff_t *ppos, 1169c55e01cSJens Axboe struct pipe_inode_info *pipe, size_t len, 1179c55e01cSJens Axboe unsigned int flags); 1181da177e4SLinus Torvalds 1191da177e4SLinus Torvalds /* 1201da177e4SLinus Torvalds * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear 1211da177e4SLinus Torvalds * in the operation structures but are done directly via the socketcall() multiplexor. 1221da177e4SLinus Torvalds */ 1231da177e4SLinus Torvalds 124da7071d7SArjan van de Ven static const struct file_operations socket_file_ops = { 1251da177e4SLinus Torvalds .owner = THIS_MODULE, 1261da177e4SLinus Torvalds .llseek = no_llseek, 1271da177e4SLinus Torvalds .aio_read = sock_aio_read, 1281da177e4SLinus Torvalds .aio_write = sock_aio_write, 1291da177e4SLinus Torvalds .poll = sock_poll, 1301da177e4SLinus Torvalds .unlocked_ioctl = sock_ioctl, 13189bbfc95SShaun Pereira #ifdef CONFIG_COMPAT 13289bbfc95SShaun Pereira .compat_ioctl = compat_sock_ioctl, 13389bbfc95SShaun Pereira #endif 1341da177e4SLinus Torvalds .mmap = sock_mmap, 1351da177e4SLinus Torvalds .open = sock_no_open, /* special open code to disallow open via /proc */ 1361da177e4SLinus Torvalds .release = sock_close, 1371da177e4SLinus Torvalds .fasync = sock_fasync, 1385274f052SJens Axboe .sendpage = sock_sendpage, 1395274f052SJens Axboe .splice_write = generic_splice_sendpage, 1409c55e01cSJens Axboe .splice_read = sock_splice_read, 1411da177e4SLinus Torvalds }; 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds /* 1441da177e4SLinus Torvalds * The protocol list. Each protocol is registered in here. 1451da177e4SLinus Torvalds */ 1461da177e4SLinus Torvalds 1471da177e4SLinus Torvalds static DEFINE_SPINLOCK(net_family_lock); 148f0fd27d4SStephen Hemminger static const struct net_proto_family *net_families[NPROTO] __read_mostly; 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvalds /* 1511da177e4SLinus Torvalds * Statistics counters of the socket lists 1521da177e4SLinus Torvalds */ 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds static DEFINE_PER_CPU(int, sockets_in_use) = 0; 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds /* 15789bddce5SStephen Hemminger * Support routines. 15889bddce5SStephen Hemminger * Move socket addresses back and forth across the kernel/user 1591da177e4SLinus Torvalds * divide and look after the messy bits. 1601da177e4SLinus Torvalds */ 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds #define MAX_SOCK_ADDR 128 /* 108 for Unix domain - 1631da177e4SLinus Torvalds 16 for IP, 16 for IPX, 1641da177e4SLinus Torvalds 24 for IPv6, 1651da177e4SLinus Torvalds about 80 for AX.25 1661da177e4SLinus Torvalds must be at least one bigger than 1671da177e4SLinus Torvalds the AF_UNIX size (see net/unix/af_unix.c 1681da177e4SLinus Torvalds :unix_mkname()). 1691da177e4SLinus Torvalds */ 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvalds /** 1721da177e4SLinus Torvalds * move_addr_to_kernel - copy a socket address into kernel space 1731da177e4SLinus Torvalds * @uaddr: Address in user space 1741da177e4SLinus Torvalds * @kaddr: Address in kernel space 1751da177e4SLinus Torvalds * @ulen: Length in user space 1761da177e4SLinus Torvalds * 1771da177e4SLinus Torvalds * The address is copied into kernel space. If the provided address is 1781da177e4SLinus Torvalds * too long an error code of -EINVAL is returned. If the copy gives 1791da177e4SLinus Torvalds * invalid addresses -EFAULT is returned. On a success 0 is returned. 1801da177e4SLinus Torvalds */ 1811da177e4SLinus Torvalds 1821da177e4SLinus Torvalds int move_addr_to_kernel(void __user *uaddr, int ulen, void *kaddr) 1831da177e4SLinus Torvalds { 1841da177e4SLinus Torvalds if (ulen < 0 || ulen > MAX_SOCK_ADDR) 1851da177e4SLinus Torvalds return -EINVAL; 1861da177e4SLinus Torvalds if (ulen == 0) 1871da177e4SLinus Torvalds return 0; 1881da177e4SLinus Torvalds if (copy_from_user(kaddr, uaddr, ulen)) 1891da177e4SLinus Torvalds return -EFAULT; 1903ec3b2fbSDavid Woodhouse return audit_sockaddr(ulen, kaddr); 1911da177e4SLinus Torvalds } 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvalds /** 1941da177e4SLinus Torvalds * move_addr_to_user - copy an address to user space 1951da177e4SLinus Torvalds * @kaddr: kernel space address 1961da177e4SLinus Torvalds * @klen: length of address in kernel 1971da177e4SLinus Torvalds * @uaddr: user space address 1981da177e4SLinus Torvalds * @ulen: pointer to user length field 1991da177e4SLinus Torvalds * 2001da177e4SLinus Torvalds * The value pointed to by ulen on entry is the buffer length available. 2011da177e4SLinus Torvalds * This is overwritten with the buffer space used. -EINVAL is returned 2021da177e4SLinus Torvalds * if an overlong buffer is specified or a negative buffer size. -EFAULT 2031da177e4SLinus Torvalds * is returned if either the buffer or the length field are not 2041da177e4SLinus Torvalds * accessible. 2051da177e4SLinus Torvalds * After copying the data up to the limit the user specifies, the true 2061da177e4SLinus Torvalds * length of the data is written over the length limit the user 2071da177e4SLinus Torvalds * specified. Zero is returned for a success. 2081da177e4SLinus Torvalds */ 2091da177e4SLinus Torvalds 21089bddce5SStephen Hemminger int move_addr_to_user(void *kaddr, int klen, void __user *uaddr, 21189bddce5SStephen Hemminger int __user *ulen) 2121da177e4SLinus Torvalds { 2131da177e4SLinus Torvalds int err; 2141da177e4SLinus Torvalds int len; 2151da177e4SLinus Torvalds 21689bddce5SStephen Hemminger err = get_user(len, ulen); 21789bddce5SStephen Hemminger if (err) 2181da177e4SLinus Torvalds return err; 2191da177e4SLinus Torvalds if (len > klen) 2201da177e4SLinus Torvalds len = klen; 2211da177e4SLinus Torvalds if (len < 0 || len > MAX_SOCK_ADDR) 2221da177e4SLinus Torvalds return -EINVAL; 22389bddce5SStephen Hemminger if (len) { 224d6fe3945SSteve Grubb if (audit_sockaddr(klen, kaddr)) 225d6fe3945SSteve Grubb return -ENOMEM; 2261da177e4SLinus Torvalds if (copy_to_user(uaddr, kaddr, len)) 2271da177e4SLinus Torvalds return -EFAULT; 2281da177e4SLinus Torvalds } 2291da177e4SLinus Torvalds /* 2301da177e4SLinus Torvalds * "fromlen shall refer to the value before truncation.." 2311da177e4SLinus Torvalds * 1003.1g 2321da177e4SLinus Torvalds */ 2331da177e4SLinus Torvalds return __put_user(klen, ulen); 2341da177e4SLinus Torvalds } 2351da177e4SLinus Torvalds 2361da177e4SLinus Torvalds #define SOCKFS_MAGIC 0x534F434B 2371da177e4SLinus Torvalds 238e18b890bSChristoph Lameter static struct kmem_cache *sock_inode_cachep __read_mostly; 2391da177e4SLinus Torvalds 2401da177e4SLinus Torvalds static struct inode *sock_alloc_inode(struct super_block *sb) 2411da177e4SLinus Torvalds { 2421da177e4SLinus Torvalds struct socket_alloc *ei; 24389bddce5SStephen Hemminger 244e94b1766SChristoph Lameter ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL); 2451da177e4SLinus Torvalds if (!ei) 2461da177e4SLinus Torvalds return NULL; 2471da177e4SLinus Torvalds init_waitqueue_head(&ei->socket.wait); 2481da177e4SLinus Torvalds 2491da177e4SLinus Torvalds ei->socket.fasync_list = NULL; 2501da177e4SLinus Torvalds ei->socket.state = SS_UNCONNECTED; 2511da177e4SLinus Torvalds ei->socket.flags = 0; 2521da177e4SLinus Torvalds ei->socket.ops = NULL; 2531da177e4SLinus Torvalds ei->socket.sk = NULL; 2541da177e4SLinus Torvalds ei->socket.file = NULL; 2551da177e4SLinus Torvalds 2561da177e4SLinus Torvalds return &ei->vfs_inode; 2571da177e4SLinus Torvalds } 2581da177e4SLinus Torvalds 2591da177e4SLinus Torvalds static void sock_destroy_inode(struct inode *inode) 2601da177e4SLinus Torvalds { 2611da177e4SLinus Torvalds kmem_cache_free(sock_inode_cachep, 2621da177e4SLinus Torvalds container_of(inode, struct socket_alloc, vfs_inode)); 2631da177e4SLinus Torvalds } 2641da177e4SLinus Torvalds 2654ba9b9d0SChristoph Lameter static void init_once(struct kmem_cache *cachep, void *foo) 2661da177e4SLinus Torvalds { 2671da177e4SLinus Torvalds struct socket_alloc *ei = (struct socket_alloc *)foo; 2681da177e4SLinus Torvalds 2691da177e4SLinus Torvalds inode_init_once(&ei->vfs_inode); 2701da177e4SLinus Torvalds } 2711da177e4SLinus Torvalds 2721da177e4SLinus Torvalds static int init_inodecache(void) 2731da177e4SLinus Torvalds { 2741da177e4SLinus Torvalds sock_inode_cachep = kmem_cache_create("sock_inode_cache", 2751da177e4SLinus Torvalds sizeof(struct socket_alloc), 27689bddce5SStephen Hemminger 0, 27789bddce5SStephen Hemminger (SLAB_HWCACHE_ALIGN | 27889bddce5SStephen Hemminger SLAB_RECLAIM_ACCOUNT | 279fffb60f9SPaul Jackson SLAB_MEM_SPREAD), 28020c2df83SPaul Mundt init_once); 2811da177e4SLinus Torvalds if (sock_inode_cachep == NULL) 2821da177e4SLinus Torvalds return -ENOMEM; 2831da177e4SLinus Torvalds return 0; 2841da177e4SLinus Torvalds } 2851da177e4SLinus Torvalds 2861da177e4SLinus Torvalds static struct super_operations sockfs_ops = { 2871da177e4SLinus Torvalds .alloc_inode = sock_alloc_inode, 2881da177e4SLinus Torvalds .destroy_inode =sock_destroy_inode, 2891da177e4SLinus Torvalds .statfs = simple_statfs, 2901da177e4SLinus Torvalds }; 2911da177e4SLinus Torvalds 292454e2398SDavid Howells static int sockfs_get_sb(struct file_system_type *fs_type, 29389bddce5SStephen Hemminger int flags, const char *dev_name, void *data, 29489bddce5SStephen Hemminger struct vfsmount *mnt) 2951da177e4SLinus Torvalds { 296454e2398SDavid Howells return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC, 297454e2398SDavid Howells mnt); 2981da177e4SLinus Torvalds } 2991da177e4SLinus Torvalds 300ba89966cSEric Dumazet static struct vfsmount *sock_mnt __read_mostly; 3011da177e4SLinus Torvalds 3021da177e4SLinus Torvalds static struct file_system_type sock_fs_type = { 3031da177e4SLinus Torvalds .name = "sockfs", 3041da177e4SLinus Torvalds .get_sb = sockfs_get_sb, 3051da177e4SLinus Torvalds .kill_sb = kill_anon_super, 3061da177e4SLinus Torvalds }; 30789bddce5SStephen Hemminger 3081da177e4SLinus Torvalds static int sockfs_delete_dentry(struct dentry *dentry) 3091da177e4SLinus Torvalds { 310304e61e6SEric Dumazet /* 311304e61e6SEric Dumazet * At creation time, we pretended this dentry was hashed 312304e61e6SEric Dumazet * (by clearing DCACHE_UNHASHED bit in d_flags) 313304e61e6SEric Dumazet * At delete time, we restore the truth : not hashed. 314304e61e6SEric Dumazet * (so that dput() can proceed correctly) 315304e61e6SEric Dumazet */ 316304e61e6SEric Dumazet dentry->d_flags |= DCACHE_UNHASHED; 317304e61e6SEric Dumazet return 0; 3181da177e4SLinus Torvalds } 319c23fbb6bSEric Dumazet 320c23fbb6bSEric Dumazet /* 321c23fbb6bSEric Dumazet * sockfs_dname() is called from d_path(). 322c23fbb6bSEric Dumazet */ 323c23fbb6bSEric Dumazet static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen) 324c23fbb6bSEric Dumazet { 325c23fbb6bSEric Dumazet return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]", 326c23fbb6bSEric Dumazet dentry->d_inode->i_ino); 327c23fbb6bSEric Dumazet } 328c23fbb6bSEric Dumazet 3291da177e4SLinus Torvalds static struct dentry_operations sockfs_dentry_operations = { 3301da177e4SLinus Torvalds .d_delete = sockfs_delete_dentry, 331c23fbb6bSEric Dumazet .d_dname = sockfs_dname, 3321da177e4SLinus Torvalds }; 3331da177e4SLinus Torvalds 3341da177e4SLinus Torvalds /* 3351da177e4SLinus Torvalds * Obtains the first available file descriptor and sets it up for use. 3361da177e4SLinus Torvalds * 33739d8c1b6SDavid S. Miller * These functions create file structures and maps them to fd space 33839d8c1b6SDavid S. Miller * of the current process. On success it returns file descriptor 3391da177e4SLinus Torvalds * and file struct implicitly stored in sock->file. 3401da177e4SLinus Torvalds * Note that another thread may close file descriptor before we return 3411da177e4SLinus Torvalds * from this function. We use the fact that now we do not refer 3421da177e4SLinus Torvalds * to socket after mapping. If one day we will need it, this 3431da177e4SLinus Torvalds * function will increment ref. count on file by 1. 3441da177e4SLinus Torvalds * 3451da177e4SLinus Torvalds * In any case returned fd MAY BE not valid! 3461da177e4SLinus Torvalds * This race condition is unavoidable 3471da177e4SLinus Torvalds * with shared fd spaces, we cannot solve it inside kernel, 3481da177e4SLinus Torvalds * but we take care of internal coherence yet. 3491da177e4SLinus Torvalds */ 3501da177e4SLinus Torvalds 35139d8c1b6SDavid S. Miller static int sock_alloc_fd(struct file **filep) 3521da177e4SLinus Torvalds { 3531da177e4SLinus Torvalds int fd; 3541da177e4SLinus Torvalds 3551da177e4SLinus Torvalds fd = get_unused_fd(); 35639d8c1b6SDavid S. Miller if (likely(fd >= 0)) { 3571da177e4SLinus Torvalds struct file *file = get_empty_filp(); 3581da177e4SLinus Torvalds 35939d8c1b6SDavid S. Miller *filep = file; 36039d8c1b6SDavid S. Miller if (unlikely(!file)) { 3611da177e4SLinus Torvalds put_unused_fd(fd); 36239d8c1b6SDavid S. Miller return -ENFILE; 3631da177e4SLinus Torvalds } 36439d8c1b6SDavid S. Miller } else 36539d8c1b6SDavid S. Miller *filep = NULL; 36639d8c1b6SDavid S. Miller return fd; 36739d8c1b6SDavid S. Miller } 36839d8c1b6SDavid S. Miller 36939d8c1b6SDavid S. Miller static int sock_attach_fd(struct socket *sock, struct file *file) 37039d8c1b6SDavid S. Miller { 371ce8d2cdfSDave Hansen struct dentry *dentry; 372c23fbb6bSEric Dumazet struct qstr name = { .name = "" }; 3731da177e4SLinus Torvalds 374ce8d2cdfSDave Hansen dentry = d_alloc(sock_mnt->mnt_sb->s_root, &name); 375ce8d2cdfSDave Hansen if (unlikely(!dentry)) 37639d8c1b6SDavid S. Miller return -ENOMEM; 37739d8c1b6SDavid S. Miller 378ce8d2cdfSDave Hansen dentry->d_op = &sockfs_dentry_operations; 379304e61e6SEric Dumazet /* 380304e61e6SEric Dumazet * We dont want to push this dentry into global dentry hash table. 381304e61e6SEric Dumazet * We pretend dentry is already hashed, by unsetting DCACHE_UNHASHED 382304e61e6SEric Dumazet * This permits a working /proc/$pid/fd/XXX on sockets 383304e61e6SEric Dumazet */ 384ce8d2cdfSDave Hansen dentry->d_flags &= ~DCACHE_UNHASHED; 385ce8d2cdfSDave Hansen d_instantiate(dentry, SOCK_INODE(sock)); 3861da177e4SLinus Torvalds 3871da177e4SLinus Torvalds sock->file = file; 388ce8d2cdfSDave Hansen init_file(file, sock_mnt, dentry, FMODE_READ | FMODE_WRITE, 389ce8d2cdfSDave Hansen &socket_file_ops); 390ce8d2cdfSDave Hansen SOCK_INODE(sock)->i_fop = &socket_file_ops; 3911da177e4SLinus Torvalds file->f_flags = O_RDWR; 3921da177e4SLinus Torvalds file->f_pos = 0; 39307dc3f07SBenjamin LaHaise file->private_data = sock; 39439d8c1b6SDavid S. Miller 39539d8c1b6SDavid S. Miller return 0; 3961da177e4SLinus Torvalds } 3971da177e4SLinus Torvalds 39839d8c1b6SDavid S. Miller int sock_map_fd(struct socket *sock) 39939d8c1b6SDavid S. Miller { 40039d8c1b6SDavid S. Miller struct file *newfile; 40139d8c1b6SDavid S. Miller int fd = sock_alloc_fd(&newfile); 40239d8c1b6SDavid S. Miller 40339d8c1b6SDavid S. Miller if (likely(fd >= 0)) { 40439d8c1b6SDavid S. Miller int err = sock_attach_fd(sock, newfile); 40539d8c1b6SDavid S. Miller 40639d8c1b6SDavid S. Miller if (unlikely(err < 0)) { 40739d8c1b6SDavid S. Miller put_filp(newfile); 40839d8c1b6SDavid S. Miller put_unused_fd(fd); 40939d8c1b6SDavid S. Miller return err; 41039d8c1b6SDavid S. Miller } 41139d8c1b6SDavid S. Miller fd_install(fd, newfile); 41239d8c1b6SDavid S. Miller } 4131da177e4SLinus Torvalds return fd; 4141da177e4SLinus Torvalds } 4151da177e4SLinus Torvalds 4166cb153caSBenjamin LaHaise static struct socket *sock_from_file(struct file *file, int *err) 4176cb153caSBenjamin LaHaise { 4186cb153caSBenjamin LaHaise if (file->f_op == &socket_file_ops) 4196cb153caSBenjamin LaHaise return file->private_data; /* set in sock_map_fd */ 4206cb153caSBenjamin LaHaise 4216cb153caSBenjamin LaHaise *err = -ENOTSOCK; 4226cb153caSBenjamin LaHaise return NULL; 4236cb153caSBenjamin LaHaise } 4246cb153caSBenjamin LaHaise 4251da177e4SLinus Torvalds /** 4261da177e4SLinus Torvalds * sockfd_lookup - Go from a file number to its socket slot 4271da177e4SLinus Torvalds * @fd: file handle 4281da177e4SLinus Torvalds * @err: pointer to an error code return 4291da177e4SLinus Torvalds * 4301da177e4SLinus Torvalds * The file handle passed in is locked and the socket it is bound 4311da177e4SLinus Torvalds * too is returned. If an error occurs the err pointer is overwritten 4321da177e4SLinus Torvalds * with a negative errno code and NULL is returned. The function checks 4331da177e4SLinus Torvalds * for both invalid handles and passing a handle which is not a socket. 4341da177e4SLinus Torvalds * 4351da177e4SLinus Torvalds * On a success the socket object pointer is returned. 4361da177e4SLinus Torvalds */ 4371da177e4SLinus Torvalds 4381da177e4SLinus Torvalds struct socket *sockfd_lookup(int fd, int *err) 4391da177e4SLinus Torvalds { 4401da177e4SLinus Torvalds struct file *file; 4411da177e4SLinus Torvalds struct socket *sock; 4421da177e4SLinus Torvalds 44389bddce5SStephen Hemminger file = fget(fd); 44489bddce5SStephen Hemminger if (!file) { 4451da177e4SLinus Torvalds *err = -EBADF; 4461da177e4SLinus Torvalds return NULL; 4471da177e4SLinus Torvalds } 44889bddce5SStephen Hemminger 4496cb153caSBenjamin LaHaise sock = sock_from_file(file, err); 4506cb153caSBenjamin LaHaise if (!sock) 4511da177e4SLinus Torvalds fput(file); 4526cb153caSBenjamin LaHaise return sock; 4531da177e4SLinus Torvalds } 4541da177e4SLinus Torvalds 4556cb153caSBenjamin LaHaise static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) 4566cb153caSBenjamin LaHaise { 4576cb153caSBenjamin LaHaise struct file *file; 4586cb153caSBenjamin LaHaise struct socket *sock; 4596cb153caSBenjamin LaHaise 4603672558cSHua Zhong *err = -EBADF; 4616cb153caSBenjamin LaHaise file = fget_light(fd, fput_needed); 4626cb153caSBenjamin LaHaise if (file) { 4636cb153caSBenjamin LaHaise sock = sock_from_file(file, err); 4646cb153caSBenjamin LaHaise if (sock) 4651da177e4SLinus Torvalds return sock; 4666cb153caSBenjamin LaHaise fput_light(file, *fput_needed); 4676cb153caSBenjamin LaHaise } 4686cb153caSBenjamin LaHaise return NULL; 4691da177e4SLinus Torvalds } 4701da177e4SLinus Torvalds 4711da177e4SLinus Torvalds /** 4721da177e4SLinus Torvalds * sock_alloc - allocate a socket 4731da177e4SLinus Torvalds * 4741da177e4SLinus Torvalds * Allocate a new inode and socket object. The two are bound together 4751da177e4SLinus Torvalds * and initialised. The socket is then returned. If we are out of inodes 4761da177e4SLinus Torvalds * NULL is returned. 4771da177e4SLinus Torvalds */ 4781da177e4SLinus Torvalds 4791da177e4SLinus Torvalds static struct socket *sock_alloc(void) 4801da177e4SLinus Torvalds { 4811da177e4SLinus Torvalds struct inode *inode; 4821da177e4SLinus Torvalds struct socket *sock; 4831da177e4SLinus Torvalds 4841da177e4SLinus Torvalds inode = new_inode(sock_mnt->mnt_sb); 4851da177e4SLinus Torvalds if (!inode) 4861da177e4SLinus Torvalds return NULL; 4871da177e4SLinus Torvalds 4881da177e4SLinus Torvalds sock = SOCKET_I(inode); 4891da177e4SLinus Torvalds 4901da177e4SLinus Torvalds inode->i_mode = S_IFSOCK | S_IRWXUGO; 4911da177e4SLinus Torvalds inode->i_uid = current->fsuid; 4921da177e4SLinus Torvalds inode->i_gid = current->fsgid; 4931da177e4SLinus Torvalds 4941da177e4SLinus Torvalds get_cpu_var(sockets_in_use)++; 4951da177e4SLinus Torvalds put_cpu_var(sockets_in_use); 4961da177e4SLinus Torvalds return sock; 4971da177e4SLinus Torvalds } 4981da177e4SLinus Torvalds 4991da177e4SLinus Torvalds /* 5001da177e4SLinus Torvalds * In theory you can't get an open on this inode, but /proc provides 5011da177e4SLinus Torvalds * a back door. Remember to keep it shut otherwise you'll let the 5021da177e4SLinus Torvalds * creepy crawlies in. 5031da177e4SLinus Torvalds */ 5041da177e4SLinus Torvalds 5051da177e4SLinus Torvalds static int sock_no_open(struct inode *irrelevant, struct file *dontcare) 5061da177e4SLinus Torvalds { 5071da177e4SLinus Torvalds return -ENXIO; 5081da177e4SLinus Torvalds } 5091da177e4SLinus Torvalds 5104b6f5d20SArjan van de Ven const struct file_operations bad_sock_fops = { 5111da177e4SLinus Torvalds .owner = THIS_MODULE, 5121da177e4SLinus Torvalds .open = sock_no_open, 5131da177e4SLinus Torvalds }; 5141da177e4SLinus Torvalds 5151da177e4SLinus Torvalds /** 5161da177e4SLinus Torvalds * sock_release - close a socket 5171da177e4SLinus Torvalds * @sock: socket to close 5181da177e4SLinus Torvalds * 5191da177e4SLinus Torvalds * The socket is released from the protocol stack if it has a release 5201da177e4SLinus Torvalds * callback, and the inode is then released if the socket is bound to 5211da177e4SLinus Torvalds * an inode not a file. 5221da177e4SLinus Torvalds */ 5231da177e4SLinus Torvalds 5241da177e4SLinus Torvalds void sock_release(struct socket *sock) 5251da177e4SLinus Torvalds { 5261da177e4SLinus Torvalds if (sock->ops) { 5271da177e4SLinus Torvalds struct module *owner = sock->ops->owner; 5281da177e4SLinus Torvalds 5291da177e4SLinus Torvalds sock->ops->release(sock); 5301da177e4SLinus Torvalds sock->ops = NULL; 5311da177e4SLinus Torvalds module_put(owner); 5321da177e4SLinus Torvalds } 5331da177e4SLinus Torvalds 5341da177e4SLinus Torvalds if (sock->fasync_list) 5351da177e4SLinus Torvalds printk(KERN_ERR "sock_release: fasync list not empty!\n"); 5361da177e4SLinus Torvalds 5371da177e4SLinus Torvalds get_cpu_var(sockets_in_use)--; 5381da177e4SLinus Torvalds put_cpu_var(sockets_in_use); 5391da177e4SLinus Torvalds if (!sock->file) { 5401da177e4SLinus Torvalds iput(SOCK_INODE(sock)); 5411da177e4SLinus Torvalds return; 5421da177e4SLinus Torvalds } 5431da177e4SLinus Torvalds sock->file = NULL; 5441da177e4SLinus Torvalds } 5451da177e4SLinus Torvalds 5461da177e4SLinus Torvalds static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock, 5471da177e4SLinus Torvalds struct msghdr *msg, size_t size) 5481da177e4SLinus Torvalds { 5491da177e4SLinus Torvalds struct sock_iocb *si = kiocb_to_siocb(iocb); 5501da177e4SLinus Torvalds int err; 5511da177e4SLinus Torvalds 5521da177e4SLinus Torvalds si->sock = sock; 5531da177e4SLinus Torvalds si->scm = NULL; 5541da177e4SLinus Torvalds si->msg = msg; 5551da177e4SLinus Torvalds si->size = size; 5561da177e4SLinus Torvalds 5571da177e4SLinus Torvalds err = security_socket_sendmsg(sock, msg, size); 5581da177e4SLinus Torvalds if (err) 5591da177e4SLinus Torvalds return err; 5601da177e4SLinus Torvalds 5611da177e4SLinus Torvalds return sock->ops->sendmsg(iocb, sock, msg, size); 5621da177e4SLinus Torvalds } 5631da177e4SLinus Torvalds 5641da177e4SLinus Torvalds int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 5651da177e4SLinus Torvalds { 5661da177e4SLinus Torvalds struct kiocb iocb; 5671da177e4SLinus Torvalds struct sock_iocb siocb; 5681da177e4SLinus Torvalds int ret; 5691da177e4SLinus Torvalds 5701da177e4SLinus Torvalds init_sync_kiocb(&iocb, NULL); 5711da177e4SLinus Torvalds iocb.private = &siocb; 5721da177e4SLinus Torvalds ret = __sock_sendmsg(&iocb, sock, msg, size); 5731da177e4SLinus Torvalds if (-EIOCBQUEUED == ret) 5741da177e4SLinus Torvalds ret = wait_on_sync_kiocb(&iocb); 5751da177e4SLinus Torvalds return ret; 5761da177e4SLinus Torvalds } 5771da177e4SLinus Torvalds 5781da177e4SLinus Torvalds int kernel_sendmsg(struct socket *sock, struct msghdr *msg, 5791da177e4SLinus Torvalds struct kvec *vec, size_t num, size_t size) 5801da177e4SLinus Torvalds { 5811da177e4SLinus Torvalds mm_segment_t oldfs = get_fs(); 5821da177e4SLinus Torvalds int result; 5831da177e4SLinus Torvalds 5841da177e4SLinus Torvalds set_fs(KERNEL_DS); 5851da177e4SLinus Torvalds /* 5861da177e4SLinus Torvalds * the following is safe, since for compiler definitions of kvec and 5871da177e4SLinus Torvalds * iovec are identical, yielding the same in-core layout and alignment 5881da177e4SLinus Torvalds */ 58989bddce5SStephen Hemminger msg->msg_iov = (struct iovec *)vec; 5901da177e4SLinus Torvalds msg->msg_iovlen = num; 5911da177e4SLinus Torvalds result = sock_sendmsg(sock, msg, size); 5921da177e4SLinus Torvalds set_fs(oldfs); 5931da177e4SLinus Torvalds return result; 5941da177e4SLinus Torvalds } 5951da177e4SLinus Torvalds 59692f37fd2SEric Dumazet /* 59792f37fd2SEric Dumazet * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) 59892f37fd2SEric Dumazet */ 59992f37fd2SEric Dumazet void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, 60092f37fd2SEric Dumazet struct sk_buff *skb) 60192f37fd2SEric Dumazet { 60292f37fd2SEric Dumazet ktime_t kt = skb->tstamp; 60392f37fd2SEric Dumazet 60492f37fd2SEric Dumazet if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { 60592f37fd2SEric Dumazet struct timeval tv; 60692f37fd2SEric Dumazet /* Race occurred between timestamp enabling and packet 60792f37fd2SEric Dumazet receiving. Fill in the current time for now. */ 60892f37fd2SEric Dumazet if (kt.tv64 == 0) 60992f37fd2SEric Dumazet kt = ktime_get_real(); 61092f37fd2SEric Dumazet skb->tstamp = kt; 61192f37fd2SEric Dumazet tv = ktime_to_timeval(kt); 61292f37fd2SEric Dumazet put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP, sizeof(tv), &tv); 61392f37fd2SEric Dumazet } else { 61492f37fd2SEric Dumazet struct timespec ts; 61592f37fd2SEric Dumazet /* Race occurred between timestamp enabling and packet 61692f37fd2SEric Dumazet receiving. Fill in the current time for now. */ 61792f37fd2SEric Dumazet if (kt.tv64 == 0) 61892f37fd2SEric Dumazet kt = ktime_get_real(); 61992f37fd2SEric Dumazet skb->tstamp = kt; 62092f37fd2SEric Dumazet ts = ktime_to_timespec(kt); 62192f37fd2SEric Dumazet put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS, sizeof(ts), &ts); 62292f37fd2SEric Dumazet } 62392f37fd2SEric Dumazet } 62492f37fd2SEric Dumazet 6257c81fd8bSArnaldo Carvalho de Melo EXPORT_SYMBOL_GPL(__sock_recv_timestamp); 6267c81fd8bSArnaldo Carvalho de Melo 6271da177e4SLinus Torvalds static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock, 6281da177e4SLinus Torvalds struct msghdr *msg, size_t size, int flags) 6291da177e4SLinus Torvalds { 6301da177e4SLinus Torvalds int err; 6311da177e4SLinus Torvalds struct sock_iocb *si = kiocb_to_siocb(iocb); 6321da177e4SLinus Torvalds 6331da177e4SLinus Torvalds si->sock = sock; 6341da177e4SLinus Torvalds si->scm = NULL; 6351da177e4SLinus Torvalds si->msg = msg; 6361da177e4SLinus Torvalds si->size = size; 6371da177e4SLinus Torvalds si->flags = flags; 6381da177e4SLinus Torvalds 6391da177e4SLinus Torvalds err = security_socket_recvmsg(sock, msg, size, flags); 6401da177e4SLinus Torvalds if (err) 6411da177e4SLinus Torvalds return err; 6421da177e4SLinus Torvalds 6431da177e4SLinus Torvalds return sock->ops->recvmsg(iocb, sock, msg, size, flags); 6441da177e4SLinus Torvalds } 6451da177e4SLinus Torvalds 6461da177e4SLinus Torvalds int sock_recvmsg(struct socket *sock, struct msghdr *msg, 6471da177e4SLinus Torvalds size_t size, int flags) 6481da177e4SLinus Torvalds { 6491da177e4SLinus Torvalds struct kiocb iocb; 6501da177e4SLinus Torvalds struct sock_iocb siocb; 6511da177e4SLinus Torvalds int ret; 6521da177e4SLinus Torvalds 6531da177e4SLinus Torvalds init_sync_kiocb(&iocb, NULL); 6541da177e4SLinus Torvalds iocb.private = &siocb; 6551da177e4SLinus Torvalds ret = __sock_recvmsg(&iocb, sock, msg, size, flags); 6561da177e4SLinus Torvalds if (-EIOCBQUEUED == ret) 6571da177e4SLinus Torvalds ret = wait_on_sync_kiocb(&iocb); 6581da177e4SLinus Torvalds return ret; 6591da177e4SLinus Torvalds } 6601da177e4SLinus Torvalds 6611da177e4SLinus Torvalds int kernel_recvmsg(struct socket *sock, struct msghdr *msg, 66289bddce5SStephen Hemminger struct kvec *vec, size_t num, size_t size, int flags) 6631da177e4SLinus Torvalds { 6641da177e4SLinus Torvalds mm_segment_t oldfs = get_fs(); 6651da177e4SLinus Torvalds int result; 6661da177e4SLinus Torvalds 6671da177e4SLinus Torvalds set_fs(KERNEL_DS); 6681da177e4SLinus Torvalds /* 6691da177e4SLinus Torvalds * the following is safe, since for compiler definitions of kvec and 6701da177e4SLinus Torvalds * iovec are identical, yielding the same in-core layout and alignment 6711da177e4SLinus Torvalds */ 67289bddce5SStephen Hemminger msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num; 6731da177e4SLinus Torvalds result = sock_recvmsg(sock, msg, size, flags); 6741da177e4SLinus Torvalds set_fs(oldfs); 6751da177e4SLinus Torvalds return result; 6761da177e4SLinus Torvalds } 6771da177e4SLinus Torvalds 6781da177e4SLinus Torvalds static void sock_aio_dtor(struct kiocb *iocb) 6791da177e4SLinus Torvalds { 6801da177e4SLinus Torvalds kfree(iocb->private); 6811da177e4SLinus Torvalds } 6821da177e4SLinus Torvalds 68320380731SArnaldo Carvalho de Melo static ssize_t sock_sendpage(struct file *file, struct page *page, 6841da177e4SLinus Torvalds int offset, size_t size, loff_t *ppos, int more) 6851da177e4SLinus Torvalds { 6861da177e4SLinus Torvalds struct socket *sock; 6871da177e4SLinus Torvalds int flags; 6881da177e4SLinus Torvalds 689b69aee04SEric Dumazet sock = file->private_data; 6901da177e4SLinus Torvalds 6911da177e4SLinus Torvalds flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; 6921da177e4SLinus Torvalds if (more) 6931da177e4SLinus Torvalds flags |= MSG_MORE; 6941da177e4SLinus Torvalds 6951da177e4SLinus Torvalds return sock->ops->sendpage(sock, page, offset, size, flags); 6961da177e4SLinus Torvalds } 6971da177e4SLinus Torvalds 6989c55e01cSJens Axboe static ssize_t sock_splice_read(struct file *file, loff_t *ppos, 6999c55e01cSJens Axboe struct pipe_inode_info *pipe, size_t len, 7009c55e01cSJens Axboe unsigned int flags) 7019c55e01cSJens Axboe { 7029c55e01cSJens Axboe struct socket *sock = file->private_data; 7039c55e01cSJens Axboe 7049c55e01cSJens Axboe return sock->ops->splice_read(sock, ppos, pipe, len, flags); 7059c55e01cSJens Axboe } 7069c55e01cSJens Axboe 707ce1d4d3eSChristoph Hellwig static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb, 70889bddce5SStephen Hemminger struct sock_iocb *siocb) 709ce1d4d3eSChristoph Hellwig { 710ce1d4d3eSChristoph Hellwig if (!is_sync_kiocb(iocb)) { 711ce1d4d3eSChristoph Hellwig siocb = kmalloc(sizeof(*siocb), GFP_KERNEL); 712ce1d4d3eSChristoph Hellwig if (!siocb) 713ce1d4d3eSChristoph Hellwig return NULL; 714ce1d4d3eSChristoph Hellwig iocb->ki_dtor = sock_aio_dtor; 715ce1d4d3eSChristoph Hellwig } 716ce1d4d3eSChristoph Hellwig 717ce1d4d3eSChristoph Hellwig siocb->kiocb = iocb; 718ce1d4d3eSChristoph Hellwig iocb->private = siocb; 719ce1d4d3eSChristoph Hellwig return siocb; 720ce1d4d3eSChristoph Hellwig } 721ce1d4d3eSChristoph Hellwig 722ce1d4d3eSChristoph Hellwig static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb, 723027445c3SBadari Pulavarty struct file *file, const struct iovec *iov, 72489bddce5SStephen Hemminger unsigned long nr_segs) 725ce1d4d3eSChristoph Hellwig { 726ce1d4d3eSChristoph Hellwig struct socket *sock = file->private_data; 727ce1d4d3eSChristoph Hellwig size_t size = 0; 728ce1d4d3eSChristoph Hellwig int i; 729ce1d4d3eSChristoph Hellwig 730ce1d4d3eSChristoph Hellwig for (i = 0; i < nr_segs; i++) 731ce1d4d3eSChristoph Hellwig size += iov[i].iov_len; 732ce1d4d3eSChristoph Hellwig 733ce1d4d3eSChristoph Hellwig msg->msg_name = NULL; 734ce1d4d3eSChristoph Hellwig msg->msg_namelen = 0; 735ce1d4d3eSChristoph Hellwig msg->msg_control = NULL; 736ce1d4d3eSChristoph Hellwig msg->msg_controllen = 0; 737ce1d4d3eSChristoph Hellwig msg->msg_iov = (struct iovec *)iov; 738ce1d4d3eSChristoph Hellwig msg->msg_iovlen = nr_segs; 739ce1d4d3eSChristoph Hellwig msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; 740ce1d4d3eSChristoph Hellwig 741ce1d4d3eSChristoph Hellwig return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags); 742ce1d4d3eSChristoph Hellwig } 743ce1d4d3eSChristoph Hellwig 744027445c3SBadari Pulavarty static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov, 745027445c3SBadari Pulavarty unsigned long nr_segs, loff_t pos) 746ce1d4d3eSChristoph Hellwig { 747ce1d4d3eSChristoph Hellwig struct sock_iocb siocb, *x; 748ce1d4d3eSChristoph Hellwig 749ce1d4d3eSChristoph Hellwig if (pos != 0) 750ce1d4d3eSChristoph Hellwig return -ESPIPE; 751027445c3SBadari Pulavarty 752027445c3SBadari Pulavarty if (iocb->ki_left == 0) /* Match SYS5 behaviour */ 753ce1d4d3eSChristoph Hellwig return 0; 754ce1d4d3eSChristoph Hellwig 755027445c3SBadari Pulavarty 756027445c3SBadari Pulavarty x = alloc_sock_iocb(iocb, &siocb); 757ce1d4d3eSChristoph Hellwig if (!x) 758ce1d4d3eSChristoph Hellwig return -ENOMEM; 759027445c3SBadari Pulavarty return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); 760ce1d4d3eSChristoph Hellwig } 761ce1d4d3eSChristoph Hellwig 762ce1d4d3eSChristoph Hellwig static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb, 763027445c3SBadari Pulavarty struct file *file, const struct iovec *iov, 76489bddce5SStephen Hemminger unsigned long nr_segs) 765ce1d4d3eSChristoph Hellwig { 766ce1d4d3eSChristoph Hellwig struct socket *sock = file->private_data; 767ce1d4d3eSChristoph Hellwig size_t size = 0; 768ce1d4d3eSChristoph Hellwig int i; 769ce1d4d3eSChristoph Hellwig 770ce1d4d3eSChristoph Hellwig for (i = 0; i < nr_segs; i++) 771ce1d4d3eSChristoph Hellwig size += iov[i].iov_len; 772ce1d4d3eSChristoph Hellwig 773ce1d4d3eSChristoph Hellwig msg->msg_name = NULL; 774ce1d4d3eSChristoph Hellwig msg->msg_namelen = 0; 775ce1d4d3eSChristoph Hellwig msg->msg_control = NULL; 776ce1d4d3eSChristoph Hellwig msg->msg_controllen = 0; 777ce1d4d3eSChristoph Hellwig msg->msg_iov = (struct iovec *)iov; 778ce1d4d3eSChristoph Hellwig msg->msg_iovlen = nr_segs; 779ce1d4d3eSChristoph Hellwig msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; 780ce1d4d3eSChristoph Hellwig if (sock->type == SOCK_SEQPACKET) 781ce1d4d3eSChristoph Hellwig msg->msg_flags |= MSG_EOR; 782ce1d4d3eSChristoph Hellwig 783ce1d4d3eSChristoph Hellwig return __sock_sendmsg(iocb, sock, msg, size); 784ce1d4d3eSChristoph Hellwig } 785ce1d4d3eSChristoph Hellwig 786027445c3SBadari Pulavarty static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov, 787027445c3SBadari Pulavarty unsigned long nr_segs, loff_t pos) 7881da177e4SLinus Torvalds { 789ce1d4d3eSChristoph Hellwig struct sock_iocb siocb, *x; 7901da177e4SLinus Torvalds 791ce1d4d3eSChristoph Hellwig if (pos != 0) 792ce1d4d3eSChristoph Hellwig return -ESPIPE; 793027445c3SBadari Pulavarty 794027445c3SBadari Pulavarty x = alloc_sock_iocb(iocb, &siocb); 795ce1d4d3eSChristoph Hellwig if (!x) 796ce1d4d3eSChristoph Hellwig return -ENOMEM; 797ce1d4d3eSChristoph Hellwig 798027445c3SBadari Pulavarty return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); 7991da177e4SLinus Torvalds } 8001da177e4SLinus Torvalds 8011da177e4SLinus Torvalds /* 8021da177e4SLinus Torvalds * Atomic setting of ioctl hooks to avoid race 8031da177e4SLinus Torvalds * with module unload. 8041da177e4SLinus Torvalds */ 8051da177e4SLinus Torvalds 8064a3e2f71SArjan van de Ven static DEFINE_MUTEX(br_ioctl_mutex); 807881d966bSEric W. Biederman static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg) = NULL; 8081da177e4SLinus Torvalds 809881d966bSEric W. Biederman void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *)) 8101da177e4SLinus Torvalds { 8114a3e2f71SArjan van de Ven mutex_lock(&br_ioctl_mutex); 8121da177e4SLinus Torvalds br_ioctl_hook = hook; 8134a3e2f71SArjan van de Ven mutex_unlock(&br_ioctl_mutex); 8141da177e4SLinus Torvalds } 81589bddce5SStephen Hemminger 8161da177e4SLinus Torvalds EXPORT_SYMBOL(brioctl_set); 8171da177e4SLinus Torvalds 8184a3e2f71SArjan van de Ven static DEFINE_MUTEX(vlan_ioctl_mutex); 819881d966bSEric W. Biederman static int (*vlan_ioctl_hook) (struct net *, void __user *arg); 8201da177e4SLinus Torvalds 821881d966bSEric W. Biederman void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) 8221da177e4SLinus Torvalds { 8234a3e2f71SArjan van de Ven mutex_lock(&vlan_ioctl_mutex); 8241da177e4SLinus Torvalds vlan_ioctl_hook = hook; 8254a3e2f71SArjan van de Ven mutex_unlock(&vlan_ioctl_mutex); 8261da177e4SLinus Torvalds } 82789bddce5SStephen Hemminger 8281da177e4SLinus Torvalds EXPORT_SYMBOL(vlan_ioctl_set); 8291da177e4SLinus Torvalds 8304a3e2f71SArjan van de Ven static DEFINE_MUTEX(dlci_ioctl_mutex); 8311da177e4SLinus Torvalds static int (*dlci_ioctl_hook) (unsigned int, void __user *); 8321da177e4SLinus Torvalds 8331da177e4SLinus Torvalds void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) 8341da177e4SLinus Torvalds { 8354a3e2f71SArjan van de Ven mutex_lock(&dlci_ioctl_mutex); 8361da177e4SLinus Torvalds dlci_ioctl_hook = hook; 8374a3e2f71SArjan van de Ven mutex_unlock(&dlci_ioctl_mutex); 8381da177e4SLinus Torvalds } 83989bddce5SStephen Hemminger 8401da177e4SLinus Torvalds EXPORT_SYMBOL(dlci_ioctl_set); 8411da177e4SLinus Torvalds 8421da177e4SLinus Torvalds /* 8431da177e4SLinus Torvalds * With an ioctl, arg may well be a user mode pointer, but we don't know 8441da177e4SLinus Torvalds * what to do with it - that's up to the protocol still. 8451da177e4SLinus Torvalds */ 8461da177e4SLinus Torvalds 8471da177e4SLinus Torvalds static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) 8481da177e4SLinus Torvalds { 8491da177e4SLinus Torvalds struct socket *sock; 850881d966bSEric W. Biederman struct sock *sk; 8511da177e4SLinus Torvalds void __user *argp = (void __user *)arg; 8521da177e4SLinus Torvalds int pid, err; 853881d966bSEric W. Biederman struct net *net; 8541da177e4SLinus Torvalds 855b69aee04SEric Dumazet sock = file->private_data; 856881d966bSEric W. Biederman sk = sock->sk; 857881d966bSEric W. Biederman net = sk->sk_net; 8581da177e4SLinus Torvalds if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { 859881d966bSEric W. Biederman err = dev_ioctl(net, cmd, argp); 8601da177e4SLinus Torvalds } else 861d86b5e0eSAdrian Bunk #ifdef CONFIG_WIRELESS_EXT 8621da177e4SLinus Torvalds if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { 863881d966bSEric W. Biederman err = dev_ioctl(net, cmd, argp); 8641da177e4SLinus Torvalds } else 865d86b5e0eSAdrian Bunk #endif /* CONFIG_WIRELESS_EXT */ 8661da177e4SLinus Torvalds switch (cmd) { 8671da177e4SLinus Torvalds case FIOSETOWN: 8681da177e4SLinus Torvalds case SIOCSPGRP: 8691da177e4SLinus Torvalds err = -EFAULT; 8701da177e4SLinus Torvalds if (get_user(pid, (int __user *)argp)) 8711da177e4SLinus Torvalds break; 8721da177e4SLinus Torvalds err = f_setown(sock->file, pid, 1); 8731da177e4SLinus Torvalds break; 8741da177e4SLinus Torvalds case FIOGETOWN: 8751da177e4SLinus Torvalds case SIOCGPGRP: 876609d7fa9SEric W. Biederman err = put_user(f_getown(sock->file), 87789bddce5SStephen Hemminger (int __user *)argp); 8781da177e4SLinus Torvalds break; 8791da177e4SLinus Torvalds case SIOCGIFBR: 8801da177e4SLinus Torvalds case SIOCSIFBR: 8811da177e4SLinus Torvalds case SIOCBRADDBR: 8821da177e4SLinus Torvalds case SIOCBRDELBR: 8831da177e4SLinus Torvalds err = -ENOPKG; 8841da177e4SLinus Torvalds if (!br_ioctl_hook) 8851da177e4SLinus Torvalds request_module("bridge"); 8861da177e4SLinus Torvalds 8874a3e2f71SArjan van de Ven mutex_lock(&br_ioctl_mutex); 8881da177e4SLinus Torvalds if (br_ioctl_hook) 889881d966bSEric W. Biederman err = br_ioctl_hook(net, cmd, argp); 8904a3e2f71SArjan van de Ven mutex_unlock(&br_ioctl_mutex); 8911da177e4SLinus Torvalds break; 8921da177e4SLinus Torvalds case SIOCGIFVLAN: 8931da177e4SLinus Torvalds case SIOCSIFVLAN: 8941da177e4SLinus Torvalds err = -ENOPKG; 8951da177e4SLinus Torvalds if (!vlan_ioctl_hook) 8961da177e4SLinus Torvalds request_module("8021q"); 8971da177e4SLinus Torvalds 8984a3e2f71SArjan van de Ven mutex_lock(&vlan_ioctl_mutex); 8991da177e4SLinus Torvalds if (vlan_ioctl_hook) 900881d966bSEric W. Biederman err = vlan_ioctl_hook(net, argp); 9014a3e2f71SArjan van de Ven mutex_unlock(&vlan_ioctl_mutex); 9021da177e4SLinus Torvalds break; 9031da177e4SLinus Torvalds case SIOCADDDLCI: 9041da177e4SLinus Torvalds case SIOCDELDLCI: 9051da177e4SLinus Torvalds err = -ENOPKG; 9061da177e4SLinus Torvalds if (!dlci_ioctl_hook) 9071da177e4SLinus Torvalds request_module("dlci"); 9081da177e4SLinus Torvalds 9091da177e4SLinus Torvalds if (dlci_ioctl_hook) { 9104a3e2f71SArjan van de Ven mutex_lock(&dlci_ioctl_mutex); 9111da177e4SLinus Torvalds err = dlci_ioctl_hook(cmd, argp); 9124a3e2f71SArjan van de Ven mutex_unlock(&dlci_ioctl_mutex); 9131da177e4SLinus Torvalds } 9141da177e4SLinus Torvalds break; 9151da177e4SLinus Torvalds default: 9161da177e4SLinus Torvalds err = sock->ops->ioctl(sock, cmd, arg); 917b5e5fa5eSChristoph Hellwig 918b5e5fa5eSChristoph Hellwig /* 919b5e5fa5eSChristoph Hellwig * If this ioctl is unknown try to hand it down 920b5e5fa5eSChristoph Hellwig * to the NIC driver. 921b5e5fa5eSChristoph Hellwig */ 922b5e5fa5eSChristoph Hellwig if (err == -ENOIOCTLCMD) 923881d966bSEric W. Biederman err = dev_ioctl(net, cmd, argp); 9241da177e4SLinus Torvalds break; 9251da177e4SLinus Torvalds } 9261da177e4SLinus Torvalds return err; 9271da177e4SLinus Torvalds } 9281da177e4SLinus Torvalds 9291da177e4SLinus Torvalds int sock_create_lite(int family, int type, int protocol, struct socket **res) 9301da177e4SLinus Torvalds { 9311da177e4SLinus Torvalds int err; 9321da177e4SLinus Torvalds struct socket *sock = NULL; 9331da177e4SLinus Torvalds 9341da177e4SLinus Torvalds err = security_socket_create(family, type, protocol, 1); 9351da177e4SLinus Torvalds if (err) 9361da177e4SLinus Torvalds goto out; 9371da177e4SLinus Torvalds 9381da177e4SLinus Torvalds sock = sock_alloc(); 9391da177e4SLinus Torvalds if (!sock) { 9401da177e4SLinus Torvalds err = -ENOMEM; 9411da177e4SLinus Torvalds goto out; 9421da177e4SLinus Torvalds } 9431da177e4SLinus Torvalds 9441da177e4SLinus Torvalds sock->type = type; 9457420ed23SVenkat Yekkirala err = security_socket_post_create(sock, family, type, protocol, 1); 9467420ed23SVenkat Yekkirala if (err) 9477420ed23SVenkat Yekkirala goto out_release; 9487420ed23SVenkat Yekkirala 9491da177e4SLinus Torvalds out: 9501da177e4SLinus Torvalds *res = sock; 9511da177e4SLinus Torvalds return err; 9527420ed23SVenkat Yekkirala out_release: 9537420ed23SVenkat Yekkirala sock_release(sock); 9547420ed23SVenkat Yekkirala sock = NULL; 9557420ed23SVenkat Yekkirala goto out; 9561da177e4SLinus Torvalds } 9571da177e4SLinus Torvalds 9581da177e4SLinus Torvalds /* No kernel lock held - perfect */ 9591da177e4SLinus Torvalds static unsigned int sock_poll(struct file *file, poll_table *wait) 9601da177e4SLinus Torvalds { 9611da177e4SLinus Torvalds struct socket *sock; 9621da177e4SLinus Torvalds 9631da177e4SLinus Torvalds /* 9641da177e4SLinus Torvalds * We can't return errors to poll, so it's either yes or no. 9651da177e4SLinus Torvalds */ 966b69aee04SEric Dumazet sock = file->private_data; 9671da177e4SLinus Torvalds return sock->ops->poll(file, sock, wait); 9681da177e4SLinus Torvalds } 9691da177e4SLinus Torvalds 9701da177e4SLinus Torvalds static int sock_mmap(struct file *file, struct vm_area_struct *vma) 9711da177e4SLinus Torvalds { 972b69aee04SEric Dumazet struct socket *sock = file->private_data; 9731da177e4SLinus Torvalds 9741da177e4SLinus Torvalds return sock->ops->mmap(file, sock, vma); 9751da177e4SLinus Torvalds } 9761da177e4SLinus Torvalds 97720380731SArnaldo Carvalho de Melo static int sock_close(struct inode *inode, struct file *filp) 9781da177e4SLinus Torvalds { 9791da177e4SLinus Torvalds /* 9801da177e4SLinus Torvalds * It was possible the inode is NULL we were 9811da177e4SLinus Torvalds * closing an unfinished socket. 9821da177e4SLinus Torvalds */ 9831da177e4SLinus Torvalds 98489bddce5SStephen Hemminger if (!inode) { 9851da177e4SLinus Torvalds printk(KERN_DEBUG "sock_close: NULL inode\n"); 9861da177e4SLinus Torvalds return 0; 9871da177e4SLinus Torvalds } 9881da177e4SLinus Torvalds sock_fasync(-1, filp, 0); 9891da177e4SLinus Torvalds sock_release(SOCKET_I(inode)); 9901da177e4SLinus Torvalds return 0; 9911da177e4SLinus Torvalds } 9921da177e4SLinus Torvalds 9931da177e4SLinus Torvalds /* 9941da177e4SLinus Torvalds * Update the socket async list 9951da177e4SLinus Torvalds * 9961da177e4SLinus Torvalds * Fasync_list locking strategy. 9971da177e4SLinus Torvalds * 9981da177e4SLinus Torvalds * 1. fasync_list is modified only under process context socket lock 9991da177e4SLinus Torvalds * i.e. under semaphore. 10001da177e4SLinus Torvalds * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) 10011da177e4SLinus Torvalds * or under socket lock. 10021da177e4SLinus Torvalds * 3. fasync_list can be used from softirq context, so that 10031da177e4SLinus Torvalds * modification under socket lock have to be enhanced with 10041da177e4SLinus Torvalds * write_lock_bh(&sk->sk_callback_lock). 10051da177e4SLinus Torvalds * --ANK (990710) 10061da177e4SLinus Torvalds */ 10071da177e4SLinus Torvalds 10081da177e4SLinus Torvalds static int sock_fasync(int fd, struct file *filp, int on) 10091da177e4SLinus Torvalds { 10101da177e4SLinus Torvalds struct fasync_struct *fa, *fna = NULL, **prev; 10111da177e4SLinus Torvalds struct socket *sock; 10121da177e4SLinus Torvalds struct sock *sk; 10131da177e4SLinus Torvalds 101489bddce5SStephen Hemminger if (on) { 10158b3a7005SKris Katterjohn fna = kmalloc(sizeof(struct fasync_struct), GFP_KERNEL); 10161da177e4SLinus Torvalds if (fna == NULL) 10171da177e4SLinus Torvalds return -ENOMEM; 10181da177e4SLinus Torvalds } 10191da177e4SLinus Torvalds 1020b69aee04SEric Dumazet sock = filp->private_data; 10211da177e4SLinus Torvalds 102289bddce5SStephen Hemminger sk = sock->sk; 102389bddce5SStephen Hemminger if (sk == NULL) { 10241da177e4SLinus Torvalds kfree(fna); 10251da177e4SLinus Torvalds return -EINVAL; 10261da177e4SLinus Torvalds } 10271da177e4SLinus Torvalds 10281da177e4SLinus Torvalds lock_sock(sk); 10291da177e4SLinus Torvalds 10301da177e4SLinus Torvalds prev = &(sock->fasync_list); 10311da177e4SLinus Torvalds 10321da177e4SLinus Torvalds for (fa = *prev; fa != NULL; prev = &fa->fa_next, fa = *prev) 10331da177e4SLinus Torvalds if (fa->fa_file == filp) 10341da177e4SLinus Torvalds break; 10351da177e4SLinus Torvalds 103689bddce5SStephen Hemminger if (on) { 103789bddce5SStephen Hemminger if (fa != NULL) { 10381da177e4SLinus Torvalds write_lock_bh(&sk->sk_callback_lock); 10391da177e4SLinus Torvalds fa->fa_fd = fd; 10401da177e4SLinus Torvalds write_unlock_bh(&sk->sk_callback_lock); 10411da177e4SLinus Torvalds 10421da177e4SLinus Torvalds kfree(fna); 10431da177e4SLinus Torvalds goto out; 10441da177e4SLinus Torvalds } 10451da177e4SLinus Torvalds fna->fa_file = filp; 10461da177e4SLinus Torvalds fna->fa_fd = fd; 10471da177e4SLinus Torvalds fna->magic = FASYNC_MAGIC; 10481da177e4SLinus Torvalds fna->fa_next = sock->fasync_list; 10491da177e4SLinus Torvalds write_lock_bh(&sk->sk_callback_lock); 10501da177e4SLinus Torvalds sock->fasync_list = fna; 10511da177e4SLinus Torvalds write_unlock_bh(&sk->sk_callback_lock); 105289bddce5SStephen Hemminger } else { 105389bddce5SStephen Hemminger if (fa != NULL) { 10541da177e4SLinus Torvalds write_lock_bh(&sk->sk_callback_lock); 10551da177e4SLinus Torvalds *prev = fa->fa_next; 10561da177e4SLinus Torvalds write_unlock_bh(&sk->sk_callback_lock); 10571da177e4SLinus Torvalds kfree(fa); 10581da177e4SLinus Torvalds } 10591da177e4SLinus Torvalds } 10601da177e4SLinus Torvalds 10611da177e4SLinus Torvalds out: 10621da177e4SLinus Torvalds release_sock(sock->sk); 10631da177e4SLinus Torvalds return 0; 10641da177e4SLinus Torvalds } 10651da177e4SLinus Torvalds 10661da177e4SLinus Torvalds /* This function may be called only under socket lock or callback_lock */ 10671da177e4SLinus Torvalds 10681da177e4SLinus Torvalds int sock_wake_async(struct socket *sock, int how, int band) 10691da177e4SLinus Torvalds { 10701da177e4SLinus Torvalds if (!sock || !sock->fasync_list) 10711da177e4SLinus Torvalds return -1; 107289bddce5SStephen Hemminger switch (how) { 10738d8ad9d7SPavel Emelyanov case SOCK_WAKE_WAITD: 10741da177e4SLinus Torvalds if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags)) 10751da177e4SLinus Torvalds break; 10761da177e4SLinus Torvalds goto call_kill; 10778d8ad9d7SPavel Emelyanov case SOCK_WAKE_SPACE: 10781da177e4SLinus Torvalds if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags)) 10791da177e4SLinus Torvalds break; 10801da177e4SLinus Torvalds /* fall through */ 10818d8ad9d7SPavel Emelyanov case SOCK_WAKE_IO: 10821da177e4SLinus Torvalds call_kill: 10831da177e4SLinus Torvalds __kill_fasync(sock->fasync_list, SIGIO, band); 10841da177e4SLinus Torvalds break; 10858d8ad9d7SPavel Emelyanov case SOCK_WAKE_URG: 10861da177e4SLinus Torvalds __kill_fasync(sock->fasync_list, SIGURG, band); 10871da177e4SLinus Torvalds } 10881da177e4SLinus Torvalds return 0; 10891da177e4SLinus Torvalds } 10901da177e4SLinus Torvalds 10911b8d7ae4SEric W. Biederman static int __sock_create(struct net *net, int family, int type, int protocol, 109289bddce5SStephen Hemminger struct socket **res, int kern) 10931da177e4SLinus Torvalds { 10941da177e4SLinus Torvalds int err; 10951da177e4SLinus Torvalds struct socket *sock; 109655737fdaSStephen Hemminger const struct net_proto_family *pf; 10971da177e4SLinus Torvalds 10981da177e4SLinus Torvalds /* 10991da177e4SLinus Torvalds * Check protocol is in range 11001da177e4SLinus Torvalds */ 11011da177e4SLinus Torvalds if (family < 0 || family >= NPROTO) 11021da177e4SLinus Torvalds return -EAFNOSUPPORT; 11031da177e4SLinus Torvalds if (type < 0 || type >= SOCK_MAX) 11041da177e4SLinus Torvalds return -EINVAL; 11051da177e4SLinus Torvalds 11061da177e4SLinus Torvalds /* Compatibility. 11071da177e4SLinus Torvalds 11081da177e4SLinus Torvalds This uglymoron is moved from INET layer to here to avoid 11091da177e4SLinus Torvalds deadlock in module load. 11101da177e4SLinus Torvalds */ 11111da177e4SLinus Torvalds if (family == PF_INET && type == SOCK_PACKET) { 11121da177e4SLinus Torvalds static int warned; 11131da177e4SLinus Torvalds if (!warned) { 11141da177e4SLinus Torvalds warned = 1; 111589bddce5SStephen Hemminger printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n", 111689bddce5SStephen Hemminger current->comm); 11171da177e4SLinus Torvalds } 11181da177e4SLinus Torvalds family = PF_PACKET; 11191da177e4SLinus Torvalds } 11201da177e4SLinus Torvalds 11211da177e4SLinus Torvalds err = security_socket_create(family, type, protocol, kern); 11221da177e4SLinus Torvalds if (err) 11231da177e4SLinus Torvalds return err; 11241da177e4SLinus Torvalds 112555737fdaSStephen Hemminger /* 112655737fdaSStephen Hemminger * Allocate the socket and allow the family to set things up. if 112755737fdaSStephen Hemminger * the protocol is 0, the family is instructed to select an appropriate 112855737fdaSStephen Hemminger * default. 112955737fdaSStephen Hemminger */ 113055737fdaSStephen Hemminger sock = sock_alloc(); 113155737fdaSStephen Hemminger if (!sock) { 113255737fdaSStephen Hemminger if (net_ratelimit()) 113355737fdaSStephen Hemminger printk(KERN_WARNING "socket: no more sockets\n"); 113455737fdaSStephen Hemminger return -ENFILE; /* Not exactly a match, but its the 113555737fdaSStephen Hemminger closest posix thing */ 113655737fdaSStephen Hemminger } 113755737fdaSStephen Hemminger 113855737fdaSStephen Hemminger sock->type = type; 113955737fdaSStephen Hemminger 11401da177e4SLinus Torvalds #if defined(CONFIG_KMOD) 11411da177e4SLinus Torvalds /* Attempt to load a protocol module if the find failed. 11421da177e4SLinus Torvalds * 11431da177e4SLinus Torvalds * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user 11441da177e4SLinus Torvalds * requested real, full-featured networking support upon configuration. 11451da177e4SLinus Torvalds * Otherwise module support will break! 11461da177e4SLinus Torvalds */ 114755737fdaSStephen Hemminger if (net_families[family] == NULL) 11481da177e4SLinus Torvalds request_module("net-pf-%d", family); 11491da177e4SLinus Torvalds #endif 11501da177e4SLinus Torvalds 115155737fdaSStephen Hemminger rcu_read_lock(); 115255737fdaSStephen Hemminger pf = rcu_dereference(net_families[family]); 11531da177e4SLinus Torvalds err = -EAFNOSUPPORT; 115455737fdaSStephen Hemminger if (!pf) 115555737fdaSStephen Hemminger goto out_release; 11561da177e4SLinus Torvalds 11571da177e4SLinus Torvalds /* 11581da177e4SLinus Torvalds * We will call the ->create function, that possibly is in a loadable 11591da177e4SLinus Torvalds * module, so we have to bump that loadable module refcnt first. 11601da177e4SLinus Torvalds */ 116155737fdaSStephen Hemminger if (!try_module_get(pf->owner)) 11621da177e4SLinus Torvalds goto out_release; 11631da177e4SLinus Torvalds 116455737fdaSStephen Hemminger /* Now protected by module ref count */ 116555737fdaSStephen Hemminger rcu_read_unlock(); 116655737fdaSStephen Hemminger 11671b8d7ae4SEric W. Biederman err = pf->create(net, sock, protocol); 116855737fdaSStephen Hemminger if (err < 0) 11691da177e4SLinus Torvalds goto out_module_put; 1170a79af59eSFrank Filz 11711da177e4SLinus Torvalds /* 11721da177e4SLinus Torvalds * Now to bump the refcnt of the [loadable] module that owns this 11731da177e4SLinus Torvalds * socket at sock_release time we decrement its refcnt. 11741da177e4SLinus Torvalds */ 117555737fdaSStephen Hemminger if (!try_module_get(sock->ops->owner)) 117655737fdaSStephen Hemminger goto out_module_busy; 117755737fdaSStephen Hemminger 11781da177e4SLinus Torvalds /* 11791da177e4SLinus Torvalds * Now that we're done with the ->create function, the [loadable] 11801da177e4SLinus Torvalds * module can have its refcnt decremented 11811da177e4SLinus Torvalds */ 118255737fdaSStephen Hemminger module_put(pf->owner); 11837420ed23SVenkat Yekkirala err = security_socket_post_create(sock, family, type, protocol, kern); 11847420ed23SVenkat Yekkirala if (err) 11853b185525SHerbert Xu goto out_sock_release; 118655737fdaSStephen Hemminger *res = sock; 11871da177e4SLinus Torvalds 118855737fdaSStephen Hemminger return 0; 118955737fdaSStephen Hemminger 119055737fdaSStephen Hemminger out_module_busy: 119155737fdaSStephen Hemminger err = -EAFNOSUPPORT; 11921da177e4SLinus Torvalds out_module_put: 119355737fdaSStephen Hemminger sock->ops = NULL; 119455737fdaSStephen Hemminger module_put(pf->owner); 119555737fdaSStephen Hemminger out_sock_release: 11961da177e4SLinus Torvalds sock_release(sock); 119755737fdaSStephen Hemminger return err; 119855737fdaSStephen Hemminger 119955737fdaSStephen Hemminger out_release: 120055737fdaSStephen Hemminger rcu_read_unlock(); 120155737fdaSStephen Hemminger goto out_sock_release; 12021da177e4SLinus Torvalds } 12031da177e4SLinus Torvalds 12041da177e4SLinus Torvalds int sock_create(int family, int type, int protocol, struct socket **res) 12051da177e4SLinus Torvalds { 12061b8d7ae4SEric W. Biederman return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); 12071da177e4SLinus Torvalds } 12081da177e4SLinus Torvalds 12091da177e4SLinus Torvalds int sock_create_kern(int family, int type, int protocol, struct socket **res) 12101da177e4SLinus Torvalds { 12111b8d7ae4SEric W. Biederman return __sock_create(&init_net, family, type, protocol, res, 1); 12121da177e4SLinus Torvalds } 12131da177e4SLinus Torvalds 12141da177e4SLinus Torvalds asmlinkage long sys_socket(int family, int type, int protocol) 12151da177e4SLinus Torvalds { 12161da177e4SLinus Torvalds int retval; 12171da177e4SLinus Torvalds struct socket *sock; 12181da177e4SLinus Torvalds 12191da177e4SLinus Torvalds retval = sock_create(family, type, protocol, &sock); 12201da177e4SLinus Torvalds if (retval < 0) 12211da177e4SLinus Torvalds goto out; 12221da177e4SLinus Torvalds 12231da177e4SLinus Torvalds retval = sock_map_fd(sock); 12241da177e4SLinus Torvalds if (retval < 0) 12251da177e4SLinus Torvalds goto out_release; 12261da177e4SLinus Torvalds 12271da177e4SLinus Torvalds out: 12281da177e4SLinus Torvalds /* It may be already another descriptor 8) Not kernel problem. */ 12291da177e4SLinus Torvalds return retval; 12301da177e4SLinus Torvalds 12311da177e4SLinus Torvalds out_release: 12321da177e4SLinus Torvalds sock_release(sock); 12331da177e4SLinus Torvalds return retval; 12341da177e4SLinus Torvalds } 12351da177e4SLinus Torvalds 12361da177e4SLinus Torvalds /* 12371da177e4SLinus Torvalds * Create a pair of connected sockets. 12381da177e4SLinus Torvalds */ 12391da177e4SLinus Torvalds 124089bddce5SStephen Hemminger asmlinkage long sys_socketpair(int family, int type, int protocol, 124189bddce5SStephen Hemminger int __user *usockvec) 12421da177e4SLinus Torvalds { 12431da177e4SLinus Torvalds struct socket *sock1, *sock2; 12441da177e4SLinus Torvalds int fd1, fd2, err; 1245db349509SAl Viro struct file *newfile1, *newfile2; 12461da177e4SLinus Torvalds 12471da177e4SLinus Torvalds /* 12481da177e4SLinus Torvalds * Obtain the first socket and check if the underlying protocol 12491da177e4SLinus Torvalds * supports the socketpair call. 12501da177e4SLinus Torvalds */ 12511da177e4SLinus Torvalds 12521da177e4SLinus Torvalds err = sock_create(family, type, protocol, &sock1); 12531da177e4SLinus Torvalds if (err < 0) 12541da177e4SLinus Torvalds goto out; 12551da177e4SLinus Torvalds 12561da177e4SLinus Torvalds err = sock_create(family, type, protocol, &sock2); 12571da177e4SLinus Torvalds if (err < 0) 12581da177e4SLinus Torvalds goto out_release_1; 12591da177e4SLinus Torvalds 12601da177e4SLinus Torvalds err = sock1->ops->socketpair(sock1, sock2); 12611da177e4SLinus Torvalds if (err < 0) 12621da177e4SLinus Torvalds goto out_release_both; 12631da177e4SLinus Torvalds 1264db349509SAl Viro fd1 = sock_alloc_fd(&newfile1); 1265bf3c23d1SDavid S. Miller if (unlikely(fd1 < 0)) { 1266bf3c23d1SDavid S. Miller err = fd1; 12671da177e4SLinus Torvalds goto out_release_both; 1268bf3c23d1SDavid S. Miller } 12691da177e4SLinus Torvalds 1270db349509SAl Viro fd2 = sock_alloc_fd(&newfile2); 1271db349509SAl Viro if (unlikely(fd2 < 0)) { 1272bf3c23d1SDavid S. Miller err = fd2; 1273db349509SAl Viro put_filp(newfile1); 1274db349509SAl Viro put_unused_fd(fd1); 1275db349509SAl Viro goto out_release_both; 1276db349509SAl Viro } 12771da177e4SLinus Torvalds 1278db349509SAl Viro err = sock_attach_fd(sock1, newfile1); 1279db349509SAl Viro if (unlikely(err < 0)) { 1280db349509SAl Viro goto out_fd2; 1281db349509SAl Viro } 1282db349509SAl Viro 1283db349509SAl Viro err = sock_attach_fd(sock2, newfile2); 1284db349509SAl Viro if (unlikely(err < 0)) { 1285db349509SAl Viro fput(newfile1); 1286db349509SAl Viro goto out_fd1; 1287db349509SAl Viro } 1288db349509SAl Viro 1289db349509SAl Viro err = audit_fd_pair(fd1, fd2); 1290db349509SAl Viro if (err < 0) { 1291db349509SAl Viro fput(newfile1); 1292db349509SAl Viro fput(newfile2); 1293db349509SAl Viro goto out_fd; 1294db349509SAl Viro } 1295db349509SAl Viro 1296db349509SAl Viro fd_install(fd1, newfile1); 1297db349509SAl Viro fd_install(fd2, newfile2); 12981da177e4SLinus Torvalds /* fd1 and fd2 may be already another descriptors. 12991da177e4SLinus Torvalds * Not kernel problem. 13001da177e4SLinus Torvalds */ 13011da177e4SLinus Torvalds 13021da177e4SLinus Torvalds err = put_user(fd1, &usockvec[0]); 13031da177e4SLinus Torvalds if (!err) 13041da177e4SLinus Torvalds err = put_user(fd2, &usockvec[1]); 13051da177e4SLinus Torvalds if (!err) 13061da177e4SLinus Torvalds return 0; 13071da177e4SLinus Torvalds 13081da177e4SLinus Torvalds sys_close(fd2); 13091da177e4SLinus Torvalds sys_close(fd1); 13101da177e4SLinus Torvalds return err; 13111da177e4SLinus Torvalds 13121da177e4SLinus Torvalds out_release_both: 13131da177e4SLinus Torvalds sock_release(sock2); 13141da177e4SLinus Torvalds out_release_1: 13151da177e4SLinus Torvalds sock_release(sock1); 13161da177e4SLinus Torvalds out: 13171da177e4SLinus Torvalds return err; 1318db349509SAl Viro 1319db349509SAl Viro out_fd2: 1320db349509SAl Viro put_filp(newfile1); 1321db349509SAl Viro sock_release(sock1); 1322db349509SAl Viro out_fd1: 1323db349509SAl Viro put_filp(newfile2); 1324db349509SAl Viro sock_release(sock2); 1325db349509SAl Viro out_fd: 1326db349509SAl Viro put_unused_fd(fd1); 1327db349509SAl Viro put_unused_fd(fd2); 1328db349509SAl Viro goto out; 13291da177e4SLinus Torvalds } 13301da177e4SLinus Torvalds 13311da177e4SLinus Torvalds /* 13321da177e4SLinus Torvalds * Bind a name to a socket. Nothing much to do here since it's 13331da177e4SLinus Torvalds * the protocol's responsibility to handle the local address. 13341da177e4SLinus Torvalds * 13351da177e4SLinus Torvalds * We move the socket address to kernel space before we call 13361da177e4SLinus Torvalds * the protocol layer (having also checked the address is ok). 13371da177e4SLinus Torvalds */ 13381da177e4SLinus Torvalds 13391da177e4SLinus Torvalds asmlinkage long sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) 13401da177e4SLinus Torvalds { 13411da177e4SLinus Torvalds struct socket *sock; 13421da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 13436cb153caSBenjamin LaHaise int err, fput_needed; 13441da177e4SLinus Torvalds 134589bddce5SStephen Hemminger sock = sockfd_lookup_light(fd, &err, &fput_needed); 134689bddce5SStephen Hemminger if (sock) { 134789bddce5SStephen Hemminger err = move_addr_to_kernel(umyaddr, addrlen, address); 134889bddce5SStephen Hemminger if (err >= 0) { 134989bddce5SStephen Hemminger err = security_socket_bind(sock, 135089bddce5SStephen Hemminger (struct sockaddr *)address, 135189bddce5SStephen Hemminger addrlen); 13526cb153caSBenjamin LaHaise if (!err) 13536cb153caSBenjamin LaHaise err = sock->ops->bind(sock, 135489bddce5SStephen Hemminger (struct sockaddr *) 135589bddce5SStephen Hemminger address, addrlen); 13561da177e4SLinus Torvalds } 13576cb153caSBenjamin LaHaise fput_light(sock->file, fput_needed); 13581da177e4SLinus Torvalds } 13591da177e4SLinus Torvalds return err; 13601da177e4SLinus Torvalds } 13611da177e4SLinus Torvalds 13621da177e4SLinus Torvalds /* 13631da177e4SLinus Torvalds * Perform a listen. Basically, we allow the protocol to do anything 13641da177e4SLinus Torvalds * necessary for a listen, and if that works, we mark the socket as 13651da177e4SLinus Torvalds * ready for listening. 13661da177e4SLinus Torvalds */ 13671da177e4SLinus Torvalds 13687a42c217SBrian Haley int sysctl_somaxconn __read_mostly = SOMAXCONN; 13691da177e4SLinus Torvalds 13701da177e4SLinus Torvalds asmlinkage long sys_listen(int fd, int backlog) 13711da177e4SLinus Torvalds { 13721da177e4SLinus Torvalds struct socket *sock; 13736cb153caSBenjamin LaHaise int err, fput_needed; 13741da177e4SLinus Torvalds 137589bddce5SStephen Hemminger sock = sockfd_lookup_light(fd, &err, &fput_needed); 137689bddce5SStephen Hemminger if (sock) { 13771da177e4SLinus Torvalds if ((unsigned)backlog > sysctl_somaxconn) 13781da177e4SLinus Torvalds backlog = sysctl_somaxconn; 13791da177e4SLinus Torvalds 13801da177e4SLinus Torvalds err = security_socket_listen(sock, backlog); 13816cb153caSBenjamin LaHaise if (!err) 13821da177e4SLinus Torvalds err = sock->ops->listen(sock, backlog); 13836cb153caSBenjamin LaHaise 13846cb153caSBenjamin LaHaise fput_light(sock->file, fput_needed); 13851da177e4SLinus Torvalds } 13861da177e4SLinus Torvalds return err; 13871da177e4SLinus Torvalds } 13881da177e4SLinus Torvalds 13891da177e4SLinus Torvalds /* 13901da177e4SLinus Torvalds * For accept, we attempt to create a new socket, set up the link 13911da177e4SLinus Torvalds * with the client, wake up the client, then return the new 13921da177e4SLinus Torvalds * connected fd. We collect the address of the connector in kernel 13931da177e4SLinus Torvalds * space and move it to user at the very end. This is unclean because 13941da177e4SLinus Torvalds * we open the socket then return an error. 13951da177e4SLinus Torvalds * 13961da177e4SLinus Torvalds * 1003.1g adds the ability to recvmsg() to query connection pending 13971da177e4SLinus Torvalds * status to recvmsg. We need to add that support in a way thats 13981da177e4SLinus Torvalds * clean when we restucture accept also. 13991da177e4SLinus Torvalds */ 14001da177e4SLinus Torvalds 140189bddce5SStephen Hemminger asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr, 140289bddce5SStephen Hemminger int __user *upeer_addrlen) 14031da177e4SLinus Torvalds { 14041da177e4SLinus Torvalds struct socket *sock, *newsock; 140539d8c1b6SDavid S. Miller struct file *newfile; 14066cb153caSBenjamin LaHaise int err, len, newfd, fput_needed; 14071da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 14081da177e4SLinus Torvalds 14096cb153caSBenjamin LaHaise sock = sockfd_lookup_light(fd, &err, &fput_needed); 14101da177e4SLinus Torvalds if (!sock) 14111da177e4SLinus Torvalds goto out; 14121da177e4SLinus Torvalds 14131da177e4SLinus Torvalds err = -ENFILE; 14141da177e4SLinus Torvalds if (!(newsock = sock_alloc())) 14151da177e4SLinus Torvalds goto out_put; 14161da177e4SLinus Torvalds 14171da177e4SLinus Torvalds newsock->type = sock->type; 14181da177e4SLinus Torvalds newsock->ops = sock->ops; 14191da177e4SLinus Torvalds 14201da177e4SLinus Torvalds /* 14211da177e4SLinus Torvalds * We don't need try_module_get here, as the listening socket (sock) 14221da177e4SLinus Torvalds * has the protocol module (sock->ops->owner) held. 14231da177e4SLinus Torvalds */ 14241da177e4SLinus Torvalds __module_get(newsock->ops->owner); 14251da177e4SLinus Torvalds 142639d8c1b6SDavid S. Miller newfd = sock_alloc_fd(&newfile); 142739d8c1b6SDavid S. Miller if (unlikely(newfd < 0)) { 142839d8c1b6SDavid S. Miller err = newfd; 14299a1875e6SDavid S. Miller sock_release(newsock); 14309a1875e6SDavid S. Miller goto out_put; 143139d8c1b6SDavid S. Miller } 143239d8c1b6SDavid S. Miller 143339d8c1b6SDavid S. Miller err = sock_attach_fd(newsock, newfile); 143439d8c1b6SDavid S. Miller if (err < 0) 143579f4f642SAlexey Dobriyan goto out_fd_simple; 143639d8c1b6SDavid S. Miller 1437a79af59eSFrank Filz err = security_socket_accept(sock, newsock); 1438a79af59eSFrank Filz if (err) 143939d8c1b6SDavid S. Miller goto out_fd; 1440a79af59eSFrank Filz 14411da177e4SLinus Torvalds err = sock->ops->accept(sock, newsock, sock->file->f_flags); 14421da177e4SLinus Torvalds if (err < 0) 144339d8c1b6SDavid S. Miller goto out_fd; 14441da177e4SLinus Torvalds 14451da177e4SLinus Torvalds if (upeer_sockaddr) { 144689bddce5SStephen Hemminger if (newsock->ops->getname(newsock, (struct sockaddr *)address, 144789bddce5SStephen Hemminger &len, 2) < 0) { 14481da177e4SLinus Torvalds err = -ECONNABORTED; 144939d8c1b6SDavid S. Miller goto out_fd; 14501da177e4SLinus Torvalds } 145189bddce5SStephen Hemminger err = move_addr_to_user(address, len, upeer_sockaddr, 145289bddce5SStephen Hemminger upeer_addrlen); 14531da177e4SLinus Torvalds if (err < 0) 145439d8c1b6SDavid S. Miller goto out_fd; 14551da177e4SLinus Torvalds } 14561da177e4SLinus Torvalds 14571da177e4SLinus Torvalds /* File flags are not inherited via accept() unlike another OSes. */ 14581da177e4SLinus Torvalds 145939d8c1b6SDavid S. Miller fd_install(newfd, newfile); 146039d8c1b6SDavid S. Miller err = newfd; 14611da177e4SLinus Torvalds 14621da177e4SLinus Torvalds security_socket_post_accept(sock, newsock); 14631da177e4SLinus Torvalds 14641da177e4SLinus Torvalds out_put: 14656cb153caSBenjamin LaHaise fput_light(sock->file, fput_needed); 14661da177e4SLinus Torvalds out: 14671da177e4SLinus Torvalds return err; 146879f4f642SAlexey Dobriyan out_fd_simple: 146979f4f642SAlexey Dobriyan sock_release(newsock); 147079f4f642SAlexey Dobriyan put_filp(newfile); 147179f4f642SAlexey Dobriyan put_unused_fd(newfd); 147279f4f642SAlexey Dobriyan goto out_put; 147339d8c1b6SDavid S. Miller out_fd: 14749606a216SDavid S. Miller fput(newfile); 147539d8c1b6SDavid S. Miller put_unused_fd(newfd); 14761da177e4SLinus Torvalds goto out_put; 14771da177e4SLinus Torvalds } 14781da177e4SLinus Torvalds 14791da177e4SLinus Torvalds /* 14801da177e4SLinus Torvalds * Attempt to connect to a socket with the server address. The address 14811da177e4SLinus Torvalds * is in user space so we verify it is OK and move it to kernel space. 14821da177e4SLinus Torvalds * 14831da177e4SLinus Torvalds * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to 14841da177e4SLinus Torvalds * break bindings 14851da177e4SLinus Torvalds * 14861da177e4SLinus Torvalds * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and 14871da177e4SLinus Torvalds * other SEQPACKET protocols that take time to connect() as it doesn't 14881da177e4SLinus Torvalds * include the -EINPROGRESS status for such sockets. 14891da177e4SLinus Torvalds */ 14901da177e4SLinus Torvalds 149189bddce5SStephen Hemminger asmlinkage long sys_connect(int fd, struct sockaddr __user *uservaddr, 149289bddce5SStephen Hemminger int addrlen) 14931da177e4SLinus Torvalds { 14941da177e4SLinus Torvalds struct socket *sock; 14951da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 14966cb153caSBenjamin LaHaise int err, fput_needed; 14971da177e4SLinus Torvalds 14986cb153caSBenjamin LaHaise sock = sockfd_lookup_light(fd, &err, &fput_needed); 14991da177e4SLinus Torvalds if (!sock) 15001da177e4SLinus Torvalds goto out; 15011da177e4SLinus Torvalds err = move_addr_to_kernel(uservaddr, addrlen, address); 15021da177e4SLinus Torvalds if (err < 0) 15031da177e4SLinus Torvalds goto out_put; 15041da177e4SLinus Torvalds 150589bddce5SStephen Hemminger err = 150689bddce5SStephen Hemminger security_socket_connect(sock, (struct sockaddr *)address, addrlen); 15071da177e4SLinus Torvalds if (err) 15081da177e4SLinus Torvalds goto out_put; 15091da177e4SLinus Torvalds 15101da177e4SLinus Torvalds err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen, 15111da177e4SLinus Torvalds sock->file->f_flags); 15121da177e4SLinus Torvalds out_put: 15136cb153caSBenjamin LaHaise fput_light(sock->file, fput_needed); 15141da177e4SLinus Torvalds out: 15151da177e4SLinus Torvalds return err; 15161da177e4SLinus Torvalds } 15171da177e4SLinus Torvalds 15181da177e4SLinus Torvalds /* 15191da177e4SLinus Torvalds * Get the local address ('name') of a socket object. Move the obtained 15201da177e4SLinus Torvalds * name to user space. 15211da177e4SLinus Torvalds */ 15221da177e4SLinus Torvalds 152389bddce5SStephen Hemminger asmlinkage long sys_getsockname(int fd, struct sockaddr __user *usockaddr, 152489bddce5SStephen Hemminger int __user *usockaddr_len) 15251da177e4SLinus Torvalds { 15261da177e4SLinus Torvalds struct socket *sock; 15271da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 15286cb153caSBenjamin LaHaise int len, err, fput_needed; 15291da177e4SLinus Torvalds 15306cb153caSBenjamin LaHaise sock = sockfd_lookup_light(fd, &err, &fput_needed); 15311da177e4SLinus Torvalds if (!sock) 15321da177e4SLinus Torvalds goto out; 15331da177e4SLinus Torvalds 15341da177e4SLinus Torvalds err = security_socket_getsockname(sock); 15351da177e4SLinus Torvalds if (err) 15361da177e4SLinus Torvalds goto out_put; 15371da177e4SLinus Torvalds 15381da177e4SLinus Torvalds err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 0); 15391da177e4SLinus Torvalds if (err) 15401da177e4SLinus Torvalds goto out_put; 15411da177e4SLinus Torvalds err = move_addr_to_user(address, len, usockaddr, usockaddr_len); 15421da177e4SLinus Torvalds 15431da177e4SLinus Torvalds out_put: 15446cb153caSBenjamin LaHaise fput_light(sock->file, fput_needed); 15451da177e4SLinus Torvalds out: 15461da177e4SLinus Torvalds return err; 15471da177e4SLinus Torvalds } 15481da177e4SLinus Torvalds 15491da177e4SLinus Torvalds /* 15501da177e4SLinus Torvalds * Get the remote address ('name') of a socket object. Move the obtained 15511da177e4SLinus Torvalds * name to user space. 15521da177e4SLinus Torvalds */ 15531da177e4SLinus Torvalds 155489bddce5SStephen Hemminger asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr, 155589bddce5SStephen Hemminger int __user *usockaddr_len) 15561da177e4SLinus Torvalds { 15571da177e4SLinus Torvalds struct socket *sock; 15581da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 15596cb153caSBenjamin LaHaise int len, err, fput_needed; 15601da177e4SLinus Torvalds 156189bddce5SStephen Hemminger sock = sockfd_lookup_light(fd, &err, &fput_needed); 156289bddce5SStephen Hemminger if (sock != NULL) { 15631da177e4SLinus Torvalds err = security_socket_getpeername(sock); 15641da177e4SLinus Torvalds if (err) { 15656cb153caSBenjamin LaHaise fput_light(sock->file, fput_needed); 15661da177e4SLinus Torvalds return err; 15671da177e4SLinus Torvalds } 15681da177e4SLinus Torvalds 156989bddce5SStephen Hemminger err = 157089bddce5SStephen Hemminger sock->ops->getname(sock, (struct sockaddr *)address, &len, 157189bddce5SStephen Hemminger 1); 15721da177e4SLinus Torvalds if (!err) 157389bddce5SStephen Hemminger err = move_addr_to_user(address, len, usockaddr, 157489bddce5SStephen Hemminger usockaddr_len); 15756cb153caSBenjamin LaHaise fput_light(sock->file, fput_needed); 15761da177e4SLinus Torvalds } 15771da177e4SLinus Torvalds return err; 15781da177e4SLinus Torvalds } 15791da177e4SLinus Torvalds 15801da177e4SLinus Torvalds /* 15811da177e4SLinus Torvalds * Send a datagram to a given address. We move the address into kernel 15821da177e4SLinus Torvalds * space and check the user space data area is readable before invoking 15831da177e4SLinus Torvalds * the protocol. 15841da177e4SLinus Torvalds */ 15851da177e4SLinus Torvalds 158689bddce5SStephen Hemminger asmlinkage long sys_sendto(int fd, void __user *buff, size_t len, 158789bddce5SStephen Hemminger unsigned flags, struct sockaddr __user *addr, 158889bddce5SStephen Hemminger int addr_len) 15891da177e4SLinus Torvalds { 15901da177e4SLinus Torvalds struct socket *sock; 15911da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 15921da177e4SLinus Torvalds int err; 15931da177e4SLinus Torvalds struct msghdr msg; 15941da177e4SLinus Torvalds struct iovec iov; 15956cb153caSBenjamin LaHaise int fput_needed; 15961da177e4SLinus Torvalds 1597de0fa95cSPavel Emelyanov sock = sockfd_lookup_light(fd, &err, &fput_needed); 1598de0fa95cSPavel Emelyanov if (!sock) 15994387ff75SDavid S. Miller goto out; 16006cb153caSBenjamin LaHaise 16011da177e4SLinus Torvalds iov.iov_base = buff; 16021da177e4SLinus Torvalds iov.iov_len = len; 16031da177e4SLinus Torvalds msg.msg_name = NULL; 16041da177e4SLinus Torvalds msg.msg_iov = &iov; 16051da177e4SLinus Torvalds msg.msg_iovlen = 1; 16061da177e4SLinus Torvalds msg.msg_control = NULL; 16071da177e4SLinus Torvalds msg.msg_controllen = 0; 16081da177e4SLinus Torvalds msg.msg_namelen = 0; 16096cb153caSBenjamin LaHaise if (addr) { 16101da177e4SLinus Torvalds err = move_addr_to_kernel(addr, addr_len, address); 16111da177e4SLinus Torvalds if (err < 0) 16121da177e4SLinus Torvalds goto out_put; 16131da177e4SLinus Torvalds msg.msg_name = address; 16141da177e4SLinus Torvalds msg.msg_namelen = addr_len; 16151da177e4SLinus Torvalds } 16161da177e4SLinus Torvalds if (sock->file->f_flags & O_NONBLOCK) 16171da177e4SLinus Torvalds flags |= MSG_DONTWAIT; 16181da177e4SLinus Torvalds msg.msg_flags = flags; 16191da177e4SLinus Torvalds err = sock_sendmsg(sock, &msg, len); 16201da177e4SLinus Torvalds 16211da177e4SLinus Torvalds out_put: 1622de0fa95cSPavel Emelyanov fput_light(sock->file, fput_needed); 16234387ff75SDavid S. Miller out: 16241da177e4SLinus Torvalds return err; 16251da177e4SLinus Torvalds } 16261da177e4SLinus Torvalds 16271da177e4SLinus Torvalds /* 16281da177e4SLinus Torvalds * Send a datagram down a socket. 16291da177e4SLinus Torvalds */ 16301da177e4SLinus Torvalds 16311da177e4SLinus Torvalds asmlinkage long sys_send(int fd, void __user *buff, size_t len, unsigned flags) 16321da177e4SLinus Torvalds { 16331da177e4SLinus Torvalds return sys_sendto(fd, buff, len, flags, NULL, 0); 16341da177e4SLinus Torvalds } 16351da177e4SLinus Torvalds 16361da177e4SLinus Torvalds /* 16371da177e4SLinus Torvalds * Receive a frame from the socket and optionally record the address of the 16381da177e4SLinus Torvalds * sender. We verify the buffers are writable and if needed move the 16391da177e4SLinus Torvalds * sender address from kernel to user space. 16401da177e4SLinus Torvalds */ 16411da177e4SLinus Torvalds 164289bddce5SStephen Hemminger asmlinkage long sys_recvfrom(int fd, void __user *ubuf, size_t size, 164389bddce5SStephen Hemminger unsigned flags, struct sockaddr __user *addr, 164489bddce5SStephen Hemminger int __user *addr_len) 16451da177e4SLinus Torvalds { 16461da177e4SLinus Torvalds struct socket *sock; 16471da177e4SLinus Torvalds struct iovec iov; 16481da177e4SLinus Torvalds struct msghdr msg; 16491da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 16501da177e4SLinus Torvalds int err, err2; 16516cb153caSBenjamin LaHaise int fput_needed; 16521da177e4SLinus Torvalds 1653de0fa95cSPavel Emelyanov sock = sockfd_lookup_light(fd, &err, &fput_needed); 16541da177e4SLinus Torvalds if (!sock) 1655de0fa95cSPavel Emelyanov goto out; 16561da177e4SLinus Torvalds 16571da177e4SLinus Torvalds msg.msg_control = NULL; 16581da177e4SLinus Torvalds msg.msg_controllen = 0; 16591da177e4SLinus Torvalds msg.msg_iovlen = 1; 16601da177e4SLinus Torvalds msg.msg_iov = &iov; 16611da177e4SLinus Torvalds iov.iov_len = size; 16621da177e4SLinus Torvalds iov.iov_base = ubuf; 16631da177e4SLinus Torvalds msg.msg_name = address; 16641da177e4SLinus Torvalds msg.msg_namelen = MAX_SOCK_ADDR; 16651da177e4SLinus Torvalds if (sock->file->f_flags & O_NONBLOCK) 16661da177e4SLinus Torvalds flags |= MSG_DONTWAIT; 16671da177e4SLinus Torvalds err = sock_recvmsg(sock, &msg, size, flags); 16681da177e4SLinus Torvalds 166989bddce5SStephen Hemminger if (err >= 0 && addr != NULL) { 16701da177e4SLinus Torvalds err2 = move_addr_to_user(address, msg.msg_namelen, addr, addr_len); 16711da177e4SLinus Torvalds if (err2 < 0) 16721da177e4SLinus Torvalds err = err2; 16731da177e4SLinus Torvalds } 1674de0fa95cSPavel Emelyanov 1675de0fa95cSPavel Emelyanov fput_light(sock->file, fput_needed); 16764387ff75SDavid S. Miller out: 16771da177e4SLinus Torvalds return err; 16781da177e4SLinus Torvalds } 16791da177e4SLinus Torvalds 16801da177e4SLinus Torvalds /* 16811da177e4SLinus Torvalds * Receive a datagram from a socket. 16821da177e4SLinus Torvalds */ 16831da177e4SLinus Torvalds 168489bddce5SStephen Hemminger asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size, 168589bddce5SStephen Hemminger unsigned flags) 16861da177e4SLinus Torvalds { 16871da177e4SLinus Torvalds return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); 16881da177e4SLinus Torvalds } 16891da177e4SLinus Torvalds 16901da177e4SLinus Torvalds /* 16911da177e4SLinus Torvalds * Set a socket option. Because we don't know the option lengths we have 16921da177e4SLinus Torvalds * to pass the user mode parameter for the protocols to sort out. 16931da177e4SLinus Torvalds */ 16941da177e4SLinus Torvalds 169589bddce5SStephen Hemminger asmlinkage long sys_setsockopt(int fd, int level, int optname, 169689bddce5SStephen Hemminger char __user *optval, int optlen) 16971da177e4SLinus Torvalds { 16986cb153caSBenjamin LaHaise int err, fput_needed; 16991da177e4SLinus Torvalds struct socket *sock; 17001da177e4SLinus Torvalds 17011da177e4SLinus Torvalds if (optlen < 0) 17021da177e4SLinus Torvalds return -EINVAL; 17031da177e4SLinus Torvalds 170489bddce5SStephen Hemminger sock = sockfd_lookup_light(fd, &err, &fput_needed); 170589bddce5SStephen Hemminger if (sock != NULL) { 17061da177e4SLinus Torvalds err = security_socket_setsockopt(sock, level, optname); 17076cb153caSBenjamin LaHaise if (err) 17086cb153caSBenjamin LaHaise goto out_put; 17091da177e4SLinus Torvalds 17101da177e4SLinus Torvalds if (level == SOL_SOCKET) 171189bddce5SStephen Hemminger err = 171289bddce5SStephen Hemminger sock_setsockopt(sock, level, optname, optval, 171389bddce5SStephen Hemminger optlen); 17141da177e4SLinus Torvalds else 171589bddce5SStephen Hemminger err = 171689bddce5SStephen Hemminger sock->ops->setsockopt(sock, level, optname, optval, 171789bddce5SStephen Hemminger optlen); 17186cb153caSBenjamin LaHaise out_put: 17196cb153caSBenjamin LaHaise fput_light(sock->file, fput_needed); 17201da177e4SLinus Torvalds } 17211da177e4SLinus Torvalds return err; 17221da177e4SLinus Torvalds } 17231da177e4SLinus Torvalds 17241da177e4SLinus Torvalds /* 17251da177e4SLinus Torvalds * Get a socket option. Because we don't know the option lengths we have 17261da177e4SLinus Torvalds * to pass a user mode parameter for the protocols to sort out. 17271da177e4SLinus Torvalds */ 17281da177e4SLinus Torvalds 172989bddce5SStephen Hemminger asmlinkage long sys_getsockopt(int fd, int level, int optname, 173089bddce5SStephen Hemminger char __user *optval, int __user *optlen) 17311da177e4SLinus Torvalds { 17326cb153caSBenjamin LaHaise int err, fput_needed; 17331da177e4SLinus Torvalds struct socket *sock; 17341da177e4SLinus Torvalds 173589bddce5SStephen Hemminger sock = sockfd_lookup_light(fd, &err, &fput_needed); 173689bddce5SStephen Hemminger if (sock != NULL) { 17376cb153caSBenjamin LaHaise err = security_socket_getsockopt(sock, level, optname); 17386cb153caSBenjamin LaHaise if (err) 17396cb153caSBenjamin LaHaise goto out_put; 17401da177e4SLinus Torvalds 17411da177e4SLinus Torvalds if (level == SOL_SOCKET) 174289bddce5SStephen Hemminger err = 174389bddce5SStephen Hemminger sock_getsockopt(sock, level, optname, optval, 174489bddce5SStephen Hemminger optlen); 17451da177e4SLinus Torvalds else 174689bddce5SStephen Hemminger err = 174789bddce5SStephen Hemminger sock->ops->getsockopt(sock, level, optname, optval, 174889bddce5SStephen Hemminger optlen); 17496cb153caSBenjamin LaHaise out_put: 17506cb153caSBenjamin LaHaise fput_light(sock->file, fput_needed); 17511da177e4SLinus Torvalds } 17521da177e4SLinus Torvalds return err; 17531da177e4SLinus Torvalds } 17541da177e4SLinus Torvalds 17551da177e4SLinus Torvalds /* 17561da177e4SLinus Torvalds * Shutdown a socket. 17571da177e4SLinus Torvalds */ 17581da177e4SLinus Torvalds 17591da177e4SLinus Torvalds asmlinkage long sys_shutdown(int fd, int how) 17601da177e4SLinus Torvalds { 17616cb153caSBenjamin LaHaise int err, fput_needed; 17621da177e4SLinus Torvalds struct socket *sock; 17631da177e4SLinus Torvalds 176489bddce5SStephen Hemminger sock = sockfd_lookup_light(fd, &err, &fput_needed); 176589bddce5SStephen Hemminger if (sock != NULL) { 17661da177e4SLinus Torvalds err = security_socket_shutdown(sock, how); 17676cb153caSBenjamin LaHaise if (!err) 17681da177e4SLinus Torvalds err = sock->ops->shutdown(sock, how); 17696cb153caSBenjamin LaHaise fput_light(sock->file, fput_needed); 17701da177e4SLinus Torvalds } 17711da177e4SLinus Torvalds return err; 17721da177e4SLinus Torvalds } 17731da177e4SLinus Torvalds 17741da177e4SLinus Torvalds /* A couple of helpful macros for getting the address of the 32/64 bit 17751da177e4SLinus Torvalds * fields which are the same type (int / unsigned) on our platforms. 17761da177e4SLinus Torvalds */ 17771da177e4SLinus Torvalds #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) 17781da177e4SLinus Torvalds #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) 17791da177e4SLinus Torvalds #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) 17801da177e4SLinus Torvalds 17811da177e4SLinus Torvalds /* 17821da177e4SLinus Torvalds * BSD sendmsg interface 17831da177e4SLinus Torvalds */ 17841da177e4SLinus Torvalds 17851da177e4SLinus Torvalds asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags) 17861da177e4SLinus Torvalds { 178789bddce5SStephen Hemminger struct compat_msghdr __user *msg_compat = 178889bddce5SStephen Hemminger (struct compat_msghdr __user *)msg; 17891da177e4SLinus Torvalds struct socket *sock; 17901da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 17911da177e4SLinus Torvalds struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; 1792b9d717a7SAlex Williamson unsigned char ctl[sizeof(struct cmsghdr) + 20] 1793b9d717a7SAlex Williamson __attribute__ ((aligned(sizeof(__kernel_size_t)))); 1794b9d717a7SAlex Williamson /* 20 is size of ipv6_pktinfo */ 17951da177e4SLinus Torvalds unsigned char *ctl_buf = ctl; 17961da177e4SLinus Torvalds struct msghdr msg_sys; 17971da177e4SLinus Torvalds int err, ctl_len, iov_size, total_len; 17986cb153caSBenjamin LaHaise int fput_needed; 17991da177e4SLinus Torvalds 18001da177e4SLinus Torvalds err = -EFAULT; 18011da177e4SLinus Torvalds if (MSG_CMSG_COMPAT & flags) { 18021da177e4SLinus Torvalds if (get_compat_msghdr(&msg_sys, msg_compat)) 18031da177e4SLinus Torvalds return -EFAULT; 180489bddce5SStephen Hemminger } 180589bddce5SStephen Hemminger else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) 18061da177e4SLinus Torvalds return -EFAULT; 18071da177e4SLinus Torvalds 18086cb153caSBenjamin LaHaise sock = sockfd_lookup_light(fd, &err, &fput_needed); 18091da177e4SLinus Torvalds if (!sock) 18101da177e4SLinus Torvalds goto out; 18111da177e4SLinus Torvalds 18121da177e4SLinus Torvalds /* do not move before msg_sys is valid */ 18131da177e4SLinus Torvalds err = -EMSGSIZE; 18141da177e4SLinus Torvalds if (msg_sys.msg_iovlen > UIO_MAXIOV) 18151da177e4SLinus Torvalds goto out_put; 18161da177e4SLinus Torvalds 18171da177e4SLinus Torvalds /* Check whether to allocate the iovec area */ 18181da177e4SLinus Torvalds err = -ENOMEM; 18191da177e4SLinus Torvalds iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); 18201da177e4SLinus Torvalds if (msg_sys.msg_iovlen > UIO_FASTIOV) { 18211da177e4SLinus Torvalds iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); 18221da177e4SLinus Torvalds if (!iov) 18231da177e4SLinus Torvalds goto out_put; 18241da177e4SLinus Torvalds } 18251da177e4SLinus Torvalds 18261da177e4SLinus Torvalds /* This will also move the address data into kernel space */ 18271da177e4SLinus Torvalds if (MSG_CMSG_COMPAT & flags) { 18281da177e4SLinus Torvalds err = verify_compat_iovec(&msg_sys, iov, address, VERIFY_READ); 18291da177e4SLinus Torvalds } else 18301da177e4SLinus Torvalds err = verify_iovec(&msg_sys, iov, address, VERIFY_READ); 18311da177e4SLinus Torvalds if (err < 0) 18321da177e4SLinus Torvalds goto out_freeiov; 18331da177e4SLinus Torvalds total_len = err; 18341da177e4SLinus Torvalds 18351da177e4SLinus Torvalds err = -ENOBUFS; 18361da177e4SLinus Torvalds 18371da177e4SLinus Torvalds if (msg_sys.msg_controllen > INT_MAX) 18381da177e4SLinus Torvalds goto out_freeiov; 18391da177e4SLinus Torvalds ctl_len = msg_sys.msg_controllen; 18401da177e4SLinus Torvalds if ((MSG_CMSG_COMPAT & flags) && ctl_len) { 184189bddce5SStephen Hemminger err = 184289bddce5SStephen Hemminger cmsghdr_from_user_compat_to_kern(&msg_sys, sock->sk, ctl, 184389bddce5SStephen Hemminger sizeof(ctl)); 18441da177e4SLinus Torvalds if (err) 18451da177e4SLinus Torvalds goto out_freeiov; 18461da177e4SLinus Torvalds ctl_buf = msg_sys.msg_control; 18478920e8f9SAl Viro ctl_len = msg_sys.msg_controllen; 18481da177e4SLinus Torvalds } else if (ctl_len) { 184989bddce5SStephen Hemminger if (ctl_len > sizeof(ctl)) { 18501da177e4SLinus Torvalds ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); 18511da177e4SLinus Torvalds if (ctl_buf == NULL) 18521da177e4SLinus Torvalds goto out_freeiov; 18531da177e4SLinus Torvalds } 18541da177e4SLinus Torvalds err = -EFAULT; 18551da177e4SLinus Torvalds /* 18561da177e4SLinus Torvalds * Careful! Before this, msg_sys.msg_control contains a user pointer. 18571da177e4SLinus Torvalds * Afterwards, it will be a kernel pointer. Thus the compiler-assisted 18581da177e4SLinus Torvalds * checking falls down on this. 18591da177e4SLinus Torvalds */ 186089bddce5SStephen Hemminger if (copy_from_user(ctl_buf, (void __user *)msg_sys.msg_control, 186189bddce5SStephen Hemminger ctl_len)) 18621da177e4SLinus Torvalds goto out_freectl; 18631da177e4SLinus Torvalds msg_sys.msg_control = ctl_buf; 18641da177e4SLinus Torvalds } 18651da177e4SLinus Torvalds msg_sys.msg_flags = flags; 18661da177e4SLinus Torvalds 18671da177e4SLinus Torvalds if (sock->file->f_flags & O_NONBLOCK) 18681da177e4SLinus Torvalds msg_sys.msg_flags |= MSG_DONTWAIT; 18691da177e4SLinus Torvalds err = sock_sendmsg(sock, &msg_sys, total_len); 18701da177e4SLinus Torvalds 18711da177e4SLinus Torvalds out_freectl: 18721da177e4SLinus Torvalds if (ctl_buf != ctl) 18731da177e4SLinus Torvalds sock_kfree_s(sock->sk, ctl_buf, ctl_len); 18741da177e4SLinus Torvalds out_freeiov: 18751da177e4SLinus Torvalds if (iov != iovstack) 18761da177e4SLinus Torvalds sock_kfree_s(sock->sk, iov, iov_size); 18771da177e4SLinus Torvalds out_put: 18786cb153caSBenjamin LaHaise fput_light(sock->file, fput_needed); 18791da177e4SLinus Torvalds out: 18801da177e4SLinus Torvalds return err; 18811da177e4SLinus Torvalds } 18821da177e4SLinus Torvalds 18831da177e4SLinus Torvalds /* 18841da177e4SLinus Torvalds * BSD recvmsg interface 18851da177e4SLinus Torvalds */ 18861da177e4SLinus Torvalds 188789bddce5SStephen Hemminger asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg, 188889bddce5SStephen Hemminger unsigned int flags) 18891da177e4SLinus Torvalds { 189089bddce5SStephen Hemminger struct compat_msghdr __user *msg_compat = 189189bddce5SStephen Hemminger (struct compat_msghdr __user *)msg; 18921da177e4SLinus Torvalds struct socket *sock; 18931da177e4SLinus Torvalds struct iovec iovstack[UIO_FASTIOV]; 18941da177e4SLinus Torvalds struct iovec *iov = iovstack; 18951da177e4SLinus Torvalds struct msghdr msg_sys; 18961da177e4SLinus Torvalds unsigned long cmsg_ptr; 18971da177e4SLinus Torvalds int err, iov_size, total_len, len; 18986cb153caSBenjamin LaHaise int fput_needed; 18991da177e4SLinus Torvalds 19001da177e4SLinus Torvalds /* kernel mode address */ 19011da177e4SLinus Torvalds char addr[MAX_SOCK_ADDR]; 19021da177e4SLinus Torvalds 19031da177e4SLinus Torvalds /* user mode address pointers */ 19041da177e4SLinus Torvalds struct sockaddr __user *uaddr; 19051da177e4SLinus Torvalds int __user *uaddr_len; 19061da177e4SLinus Torvalds 19071da177e4SLinus Torvalds if (MSG_CMSG_COMPAT & flags) { 19081da177e4SLinus Torvalds if (get_compat_msghdr(&msg_sys, msg_compat)) 19091da177e4SLinus Torvalds return -EFAULT; 191089bddce5SStephen Hemminger } 191189bddce5SStephen Hemminger else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) 19121da177e4SLinus Torvalds return -EFAULT; 19131da177e4SLinus Torvalds 19146cb153caSBenjamin LaHaise sock = sockfd_lookup_light(fd, &err, &fput_needed); 19151da177e4SLinus Torvalds if (!sock) 19161da177e4SLinus Torvalds goto out; 19171da177e4SLinus Torvalds 19181da177e4SLinus Torvalds err = -EMSGSIZE; 19191da177e4SLinus Torvalds if (msg_sys.msg_iovlen > UIO_MAXIOV) 19201da177e4SLinus Torvalds goto out_put; 19211da177e4SLinus Torvalds 19221da177e4SLinus Torvalds /* Check whether to allocate the iovec area */ 19231da177e4SLinus Torvalds err = -ENOMEM; 19241da177e4SLinus Torvalds iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); 19251da177e4SLinus Torvalds if (msg_sys.msg_iovlen > UIO_FASTIOV) { 19261da177e4SLinus Torvalds iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); 19271da177e4SLinus Torvalds if (!iov) 19281da177e4SLinus Torvalds goto out_put; 19291da177e4SLinus Torvalds } 19301da177e4SLinus Torvalds 19311da177e4SLinus Torvalds /* 19321da177e4SLinus Torvalds * Save the user-mode address (verify_iovec will change the 19331da177e4SLinus Torvalds * kernel msghdr to use the kernel address space) 19341da177e4SLinus Torvalds */ 19351da177e4SLinus Torvalds 1936cfcabdccSStephen Hemminger uaddr = (__force void __user *)msg_sys.msg_name; 19371da177e4SLinus Torvalds uaddr_len = COMPAT_NAMELEN(msg); 19381da177e4SLinus Torvalds if (MSG_CMSG_COMPAT & flags) { 19391da177e4SLinus Torvalds err = verify_compat_iovec(&msg_sys, iov, addr, VERIFY_WRITE); 19401da177e4SLinus Torvalds } else 19411da177e4SLinus Torvalds err = verify_iovec(&msg_sys, iov, addr, VERIFY_WRITE); 19421da177e4SLinus Torvalds if (err < 0) 19431da177e4SLinus Torvalds goto out_freeiov; 19441da177e4SLinus Torvalds total_len = err; 19451da177e4SLinus Torvalds 19461da177e4SLinus Torvalds cmsg_ptr = (unsigned long)msg_sys.msg_control; 19474a19542eSUlrich Drepper msg_sys.msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); 19481da177e4SLinus Torvalds 19491da177e4SLinus Torvalds if (sock->file->f_flags & O_NONBLOCK) 19501da177e4SLinus Torvalds flags |= MSG_DONTWAIT; 19511da177e4SLinus Torvalds err = sock_recvmsg(sock, &msg_sys, total_len, flags); 19521da177e4SLinus Torvalds if (err < 0) 19531da177e4SLinus Torvalds goto out_freeiov; 19541da177e4SLinus Torvalds len = err; 19551da177e4SLinus Torvalds 19561da177e4SLinus Torvalds if (uaddr != NULL) { 195789bddce5SStephen Hemminger err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr, 195889bddce5SStephen Hemminger uaddr_len); 19591da177e4SLinus Torvalds if (err < 0) 19601da177e4SLinus Torvalds goto out_freeiov; 19611da177e4SLinus Torvalds } 196237f7f421SDavid S. Miller err = __put_user((msg_sys.msg_flags & ~MSG_CMSG_COMPAT), 196337f7f421SDavid S. Miller COMPAT_FLAGS(msg)); 19641da177e4SLinus Torvalds if (err) 19651da177e4SLinus Torvalds goto out_freeiov; 19661da177e4SLinus Torvalds if (MSG_CMSG_COMPAT & flags) 19671da177e4SLinus Torvalds err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr, 19681da177e4SLinus Torvalds &msg_compat->msg_controllen); 19691da177e4SLinus Torvalds else 19701da177e4SLinus Torvalds err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr, 19711da177e4SLinus Torvalds &msg->msg_controllen); 19721da177e4SLinus Torvalds if (err) 19731da177e4SLinus Torvalds goto out_freeiov; 19741da177e4SLinus Torvalds err = len; 19751da177e4SLinus Torvalds 19761da177e4SLinus Torvalds out_freeiov: 19771da177e4SLinus Torvalds if (iov != iovstack) 19781da177e4SLinus Torvalds sock_kfree_s(sock->sk, iov, iov_size); 19791da177e4SLinus Torvalds out_put: 19806cb153caSBenjamin LaHaise fput_light(sock->file, fput_needed); 19811da177e4SLinus Torvalds out: 19821da177e4SLinus Torvalds return err; 19831da177e4SLinus Torvalds } 19841da177e4SLinus Torvalds 19851da177e4SLinus Torvalds #ifdef __ARCH_WANT_SYS_SOCKETCALL 19861da177e4SLinus Torvalds 19871da177e4SLinus Torvalds /* Argument list sizes for sys_socketcall */ 19881da177e4SLinus Torvalds #define AL(x) ((x) * sizeof(unsigned long)) 198989bddce5SStephen Hemminger static const unsigned char nargs[18]={ 199089bddce5SStephen Hemminger AL(0),AL(3),AL(3),AL(3),AL(2),AL(3), 19911da177e4SLinus Torvalds AL(3),AL(3),AL(4),AL(4),AL(4),AL(6), 199289bddce5SStephen Hemminger AL(6),AL(2),AL(5),AL(5),AL(3),AL(3) 199389bddce5SStephen Hemminger }; 199489bddce5SStephen Hemminger 19951da177e4SLinus Torvalds #undef AL 19961da177e4SLinus Torvalds 19971da177e4SLinus Torvalds /* 19981da177e4SLinus Torvalds * System call vectors. 19991da177e4SLinus Torvalds * 20001da177e4SLinus Torvalds * Argument checking cleaned up. Saved 20% in size. 20011da177e4SLinus Torvalds * This function doesn't need to set the kernel lock because 20021da177e4SLinus Torvalds * it is set by the callees. 20031da177e4SLinus Torvalds */ 20041da177e4SLinus Torvalds 20051da177e4SLinus Torvalds asmlinkage long sys_socketcall(int call, unsigned long __user *args) 20061da177e4SLinus Torvalds { 20071da177e4SLinus Torvalds unsigned long a[6]; 20081da177e4SLinus Torvalds unsigned long a0, a1; 20091da177e4SLinus Torvalds int err; 20101da177e4SLinus Torvalds 20111da177e4SLinus Torvalds if (call < 1 || call > SYS_RECVMSG) 20121da177e4SLinus Torvalds return -EINVAL; 20131da177e4SLinus Torvalds 20141da177e4SLinus Torvalds /* copy_from_user should be SMP safe. */ 20151da177e4SLinus Torvalds if (copy_from_user(a, args, nargs[call])) 20161da177e4SLinus Torvalds return -EFAULT; 20171da177e4SLinus Torvalds 20184bcff1b3SDavid Woodhouse err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); 20193ec3b2fbSDavid Woodhouse if (err) 20203ec3b2fbSDavid Woodhouse return err; 20213ec3b2fbSDavid Woodhouse 20221da177e4SLinus Torvalds a0 = a[0]; 20231da177e4SLinus Torvalds a1 = a[1]; 20241da177e4SLinus Torvalds 202589bddce5SStephen Hemminger switch (call) { 20261da177e4SLinus Torvalds case SYS_SOCKET: 20271da177e4SLinus Torvalds err = sys_socket(a0, a1, a[2]); 20281da177e4SLinus Torvalds break; 20291da177e4SLinus Torvalds case SYS_BIND: 20301da177e4SLinus Torvalds err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]); 20311da177e4SLinus Torvalds break; 20321da177e4SLinus Torvalds case SYS_CONNECT: 20331da177e4SLinus Torvalds err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); 20341da177e4SLinus Torvalds break; 20351da177e4SLinus Torvalds case SYS_LISTEN: 20361da177e4SLinus Torvalds err = sys_listen(a0, a1); 20371da177e4SLinus Torvalds break; 20381da177e4SLinus Torvalds case SYS_ACCEPT: 203989bddce5SStephen Hemminger err = 204089bddce5SStephen Hemminger sys_accept(a0, (struct sockaddr __user *)a1, 204189bddce5SStephen Hemminger (int __user *)a[2]); 20421da177e4SLinus Torvalds break; 20431da177e4SLinus Torvalds case SYS_GETSOCKNAME: 204489bddce5SStephen Hemminger err = 204589bddce5SStephen Hemminger sys_getsockname(a0, (struct sockaddr __user *)a1, 204689bddce5SStephen Hemminger (int __user *)a[2]); 20471da177e4SLinus Torvalds break; 20481da177e4SLinus Torvalds case SYS_GETPEERNAME: 204989bddce5SStephen Hemminger err = 205089bddce5SStephen Hemminger sys_getpeername(a0, (struct sockaddr __user *)a1, 205189bddce5SStephen Hemminger (int __user *)a[2]); 20521da177e4SLinus Torvalds break; 20531da177e4SLinus Torvalds case SYS_SOCKETPAIR: 20541da177e4SLinus Torvalds err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]); 20551da177e4SLinus Torvalds break; 20561da177e4SLinus Torvalds case SYS_SEND: 20571da177e4SLinus Torvalds err = sys_send(a0, (void __user *)a1, a[2], a[3]); 20581da177e4SLinus Torvalds break; 20591da177e4SLinus Torvalds case SYS_SENDTO: 20601da177e4SLinus Torvalds err = sys_sendto(a0, (void __user *)a1, a[2], a[3], 20611da177e4SLinus Torvalds (struct sockaddr __user *)a[4], a[5]); 20621da177e4SLinus Torvalds break; 20631da177e4SLinus Torvalds case SYS_RECV: 20641da177e4SLinus Torvalds err = sys_recv(a0, (void __user *)a1, a[2], a[3]); 20651da177e4SLinus Torvalds break; 20661da177e4SLinus Torvalds case SYS_RECVFROM: 20671da177e4SLinus Torvalds err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], 206889bddce5SStephen Hemminger (struct sockaddr __user *)a[4], 206989bddce5SStephen Hemminger (int __user *)a[5]); 20701da177e4SLinus Torvalds break; 20711da177e4SLinus Torvalds case SYS_SHUTDOWN: 20721da177e4SLinus Torvalds err = sys_shutdown(a0, a1); 20731da177e4SLinus Torvalds break; 20741da177e4SLinus Torvalds case SYS_SETSOCKOPT: 20751da177e4SLinus Torvalds err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); 20761da177e4SLinus Torvalds break; 20771da177e4SLinus Torvalds case SYS_GETSOCKOPT: 207889bddce5SStephen Hemminger err = 207989bddce5SStephen Hemminger sys_getsockopt(a0, a1, a[2], (char __user *)a[3], 208089bddce5SStephen Hemminger (int __user *)a[4]); 20811da177e4SLinus Torvalds break; 20821da177e4SLinus Torvalds case SYS_SENDMSG: 20831da177e4SLinus Torvalds err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]); 20841da177e4SLinus Torvalds break; 20851da177e4SLinus Torvalds case SYS_RECVMSG: 20861da177e4SLinus Torvalds err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]); 20871da177e4SLinus Torvalds break; 20881da177e4SLinus Torvalds default: 20891da177e4SLinus Torvalds err = -EINVAL; 20901da177e4SLinus Torvalds break; 20911da177e4SLinus Torvalds } 20921da177e4SLinus Torvalds return err; 20931da177e4SLinus Torvalds } 20941da177e4SLinus Torvalds 20951da177e4SLinus Torvalds #endif /* __ARCH_WANT_SYS_SOCKETCALL */ 20961da177e4SLinus Torvalds 209755737fdaSStephen Hemminger /** 209855737fdaSStephen Hemminger * sock_register - add a socket protocol handler 209955737fdaSStephen Hemminger * @ops: description of protocol 210055737fdaSStephen Hemminger * 21011da177e4SLinus Torvalds * This function is called by a protocol handler that wants to 21021da177e4SLinus Torvalds * advertise its address family, and have it linked into the 210355737fdaSStephen Hemminger * socket interface. The value ops->family coresponds to the 210455737fdaSStephen Hemminger * socket system call protocol family. 21051da177e4SLinus Torvalds */ 2106f0fd27d4SStephen Hemminger int sock_register(const struct net_proto_family *ops) 21071da177e4SLinus Torvalds { 21081da177e4SLinus Torvalds int err; 21091da177e4SLinus Torvalds 21101da177e4SLinus Torvalds if (ops->family >= NPROTO) { 211189bddce5SStephen Hemminger printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, 211289bddce5SStephen Hemminger NPROTO); 21131da177e4SLinus Torvalds return -ENOBUFS; 21141da177e4SLinus Torvalds } 211555737fdaSStephen Hemminger 211655737fdaSStephen Hemminger spin_lock(&net_family_lock); 211755737fdaSStephen Hemminger if (net_families[ops->family]) 21181da177e4SLinus Torvalds err = -EEXIST; 211955737fdaSStephen Hemminger else { 21201da177e4SLinus Torvalds net_families[ops->family] = ops; 21211da177e4SLinus Torvalds err = 0; 21221da177e4SLinus Torvalds } 212355737fdaSStephen Hemminger spin_unlock(&net_family_lock); 212455737fdaSStephen Hemminger 212589bddce5SStephen Hemminger printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family); 21261da177e4SLinus Torvalds return err; 21271da177e4SLinus Torvalds } 21281da177e4SLinus Torvalds 212955737fdaSStephen Hemminger /** 213055737fdaSStephen Hemminger * sock_unregister - remove a protocol handler 213155737fdaSStephen Hemminger * @family: protocol family to remove 213255737fdaSStephen Hemminger * 21331da177e4SLinus Torvalds * This function is called by a protocol handler that wants to 21341da177e4SLinus Torvalds * remove its address family, and have it unlinked from the 213555737fdaSStephen Hemminger * new socket creation. 213655737fdaSStephen Hemminger * 213755737fdaSStephen Hemminger * If protocol handler is a module, then it can use module reference 213855737fdaSStephen Hemminger * counts to protect against new references. If protocol handler is not 213955737fdaSStephen Hemminger * a module then it needs to provide its own protection in 214055737fdaSStephen Hemminger * the ops->create routine. 21411da177e4SLinus Torvalds */ 2142f0fd27d4SStephen Hemminger void sock_unregister(int family) 21431da177e4SLinus Torvalds { 2144f0fd27d4SStephen Hemminger BUG_ON(family < 0 || family >= NPROTO); 21451da177e4SLinus Torvalds 214655737fdaSStephen Hemminger spin_lock(&net_family_lock); 21471da177e4SLinus Torvalds net_families[family] = NULL; 214855737fdaSStephen Hemminger spin_unlock(&net_family_lock); 214955737fdaSStephen Hemminger 215055737fdaSStephen Hemminger synchronize_rcu(); 215155737fdaSStephen Hemminger 215289bddce5SStephen Hemminger printk(KERN_INFO "NET: Unregistered protocol family %d\n", family); 21531da177e4SLinus Torvalds } 21541da177e4SLinus Torvalds 215577d76ea3SAndi Kleen static int __init sock_init(void) 21561da177e4SLinus Torvalds { 21571da177e4SLinus Torvalds /* 21581da177e4SLinus Torvalds * Initialize sock SLAB cache. 21591da177e4SLinus Torvalds */ 21601da177e4SLinus Torvalds 21611da177e4SLinus Torvalds sk_init(); 21621da177e4SLinus Torvalds 21631da177e4SLinus Torvalds /* 21641da177e4SLinus Torvalds * Initialize skbuff SLAB cache 21651da177e4SLinus Torvalds */ 21661da177e4SLinus Torvalds skb_init(); 21671da177e4SLinus Torvalds 21681da177e4SLinus Torvalds /* 21691da177e4SLinus Torvalds * Initialize the protocols module. 21701da177e4SLinus Torvalds */ 21711da177e4SLinus Torvalds 21721da177e4SLinus Torvalds init_inodecache(); 21731da177e4SLinus Torvalds register_filesystem(&sock_fs_type); 21741da177e4SLinus Torvalds sock_mnt = kern_mount(&sock_fs_type); 217577d76ea3SAndi Kleen 217677d76ea3SAndi Kleen /* The real protocol initialization is performed in later initcalls. 21771da177e4SLinus Torvalds */ 21781da177e4SLinus Torvalds 21791da177e4SLinus Torvalds #ifdef CONFIG_NETFILTER 21801da177e4SLinus Torvalds netfilter_init(); 21811da177e4SLinus Torvalds #endif 2182cbeb321aSDavid S. Miller 2183cbeb321aSDavid S. Miller return 0; 21841da177e4SLinus Torvalds } 21851da177e4SLinus Torvalds 218677d76ea3SAndi Kleen core_initcall(sock_init); /* early initcall */ 218777d76ea3SAndi Kleen 21881da177e4SLinus Torvalds #ifdef CONFIG_PROC_FS 21891da177e4SLinus Torvalds void socket_seq_show(struct seq_file *seq) 21901da177e4SLinus Torvalds { 21911da177e4SLinus Torvalds int cpu; 21921da177e4SLinus Torvalds int counter = 0; 21931da177e4SLinus Torvalds 21946f912042SKAMEZAWA Hiroyuki for_each_possible_cpu(cpu) 21951da177e4SLinus Torvalds counter += per_cpu(sockets_in_use, cpu); 21961da177e4SLinus Torvalds 21971da177e4SLinus Torvalds /* It can be negative, by the way. 8) */ 21981da177e4SLinus Torvalds if (counter < 0) 21991da177e4SLinus Torvalds counter = 0; 22001da177e4SLinus Torvalds 22011da177e4SLinus Torvalds seq_printf(seq, "sockets: used %d\n", counter); 22021da177e4SLinus Torvalds } 22031da177e4SLinus Torvalds #endif /* CONFIG_PROC_FS */ 22041da177e4SLinus Torvalds 220589bbfc95SShaun Pereira #ifdef CONFIG_COMPAT 220689bbfc95SShaun Pereira static long compat_sock_ioctl(struct file *file, unsigned cmd, 220789bbfc95SShaun Pereira unsigned long arg) 220889bbfc95SShaun Pereira { 220989bbfc95SShaun Pereira struct socket *sock = file->private_data; 221089bbfc95SShaun Pereira int ret = -ENOIOCTLCMD; 221189bbfc95SShaun Pereira 221289bbfc95SShaun Pereira if (sock->ops->compat_ioctl) 221389bbfc95SShaun Pereira ret = sock->ops->compat_ioctl(sock, cmd, arg); 221489bbfc95SShaun Pereira 221589bbfc95SShaun Pereira return ret; 221689bbfc95SShaun Pereira } 221789bbfc95SShaun Pereira #endif 221889bbfc95SShaun Pereira 2219ac5a488eSSridhar Samudrala int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) 2220ac5a488eSSridhar Samudrala { 2221ac5a488eSSridhar Samudrala return sock->ops->bind(sock, addr, addrlen); 2222ac5a488eSSridhar Samudrala } 2223ac5a488eSSridhar Samudrala 2224ac5a488eSSridhar Samudrala int kernel_listen(struct socket *sock, int backlog) 2225ac5a488eSSridhar Samudrala { 2226ac5a488eSSridhar Samudrala return sock->ops->listen(sock, backlog); 2227ac5a488eSSridhar Samudrala } 2228ac5a488eSSridhar Samudrala 2229ac5a488eSSridhar Samudrala int kernel_accept(struct socket *sock, struct socket **newsock, int flags) 2230ac5a488eSSridhar Samudrala { 2231ac5a488eSSridhar Samudrala struct sock *sk = sock->sk; 2232ac5a488eSSridhar Samudrala int err; 2233ac5a488eSSridhar Samudrala 2234ac5a488eSSridhar Samudrala err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, 2235ac5a488eSSridhar Samudrala newsock); 2236ac5a488eSSridhar Samudrala if (err < 0) 2237ac5a488eSSridhar Samudrala goto done; 2238ac5a488eSSridhar Samudrala 2239ac5a488eSSridhar Samudrala err = sock->ops->accept(sock, *newsock, flags); 2240ac5a488eSSridhar Samudrala if (err < 0) { 2241ac5a488eSSridhar Samudrala sock_release(*newsock); 2242fa8705b0STony Battersby *newsock = NULL; 2243ac5a488eSSridhar Samudrala goto done; 2244ac5a488eSSridhar Samudrala } 2245ac5a488eSSridhar Samudrala 2246ac5a488eSSridhar Samudrala (*newsock)->ops = sock->ops; 2247ac5a488eSSridhar Samudrala 2248ac5a488eSSridhar Samudrala done: 2249ac5a488eSSridhar Samudrala return err; 2250ac5a488eSSridhar Samudrala } 2251ac5a488eSSridhar Samudrala 2252ac5a488eSSridhar Samudrala int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, 2253ac5a488eSSridhar Samudrala int flags) 2254ac5a488eSSridhar Samudrala { 2255ac5a488eSSridhar Samudrala return sock->ops->connect(sock, addr, addrlen, flags); 2256ac5a488eSSridhar Samudrala } 2257ac5a488eSSridhar Samudrala 2258ac5a488eSSridhar Samudrala int kernel_getsockname(struct socket *sock, struct sockaddr *addr, 2259ac5a488eSSridhar Samudrala int *addrlen) 2260ac5a488eSSridhar Samudrala { 2261ac5a488eSSridhar Samudrala return sock->ops->getname(sock, addr, addrlen, 0); 2262ac5a488eSSridhar Samudrala } 2263ac5a488eSSridhar Samudrala 2264ac5a488eSSridhar Samudrala int kernel_getpeername(struct socket *sock, struct sockaddr *addr, 2265ac5a488eSSridhar Samudrala int *addrlen) 2266ac5a488eSSridhar Samudrala { 2267ac5a488eSSridhar Samudrala return sock->ops->getname(sock, addr, addrlen, 1); 2268ac5a488eSSridhar Samudrala } 2269ac5a488eSSridhar Samudrala 2270ac5a488eSSridhar Samudrala int kernel_getsockopt(struct socket *sock, int level, int optname, 2271ac5a488eSSridhar Samudrala char *optval, int *optlen) 2272ac5a488eSSridhar Samudrala { 2273ac5a488eSSridhar Samudrala mm_segment_t oldfs = get_fs(); 2274ac5a488eSSridhar Samudrala int err; 2275ac5a488eSSridhar Samudrala 2276ac5a488eSSridhar Samudrala set_fs(KERNEL_DS); 2277ac5a488eSSridhar Samudrala if (level == SOL_SOCKET) 2278ac5a488eSSridhar Samudrala err = sock_getsockopt(sock, level, optname, optval, optlen); 2279ac5a488eSSridhar Samudrala else 2280ac5a488eSSridhar Samudrala err = sock->ops->getsockopt(sock, level, optname, optval, 2281ac5a488eSSridhar Samudrala optlen); 2282ac5a488eSSridhar Samudrala set_fs(oldfs); 2283ac5a488eSSridhar Samudrala return err; 2284ac5a488eSSridhar Samudrala } 2285ac5a488eSSridhar Samudrala 2286ac5a488eSSridhar Samudrala int kernel_setsockopt(struct socket *sock, int level, int optname, 2287ac5a488eSSridhar Samudrala char *optval, int optlen) 2288ac5a488eSSridhar Samudrala { 2289ac5a488eSSridhar Samudrala mm_segment_t oldfs = get_fs(); 2290ac5a488eSSridhar Samudrala int err; 2291ac5a488eSSridhar Samudrala 2292ac5a488eSSridhar Samudrala set_fs(KERNEL_DS); 2293ac5a488eSSridhar Samudrala if (level == SOL_SOCKET) 2294ac5a488eSSridhar Samudrala err = sock_setsockopt(sock, level, optname, optval, optlen); 2295ac5a488eSSridhar Samudrala else 2296ac5a488eSSridhar Samudrala err = sock->ops->setsockopt(sock, level, optname, optval, 2297ac5a488eSSridhar Samudrala optlen); 2298ac5a488eSSridhar Samudrala set_fs(oldfs); 2299ac5a488eSSridhar Samudrala return err; 2300ac5a488eSSridhar Samudrala } 2301ac5a488eSSridhar Samudrala 2302ac5a488eSSridhar Samudrala int kernel_sendpage(struct socket *sock, struct page *page, int offset, 2303ac5a488eSSridhar Samudrala size_t size, int flags) 2304ac5a488eSSridhar Samudrala { 2305ac5a488eSSridhar Samudrala if (sock->ops->sendpage) 2306ac5a488eSSridhar Samudrala return sock->ops->sendpage(sock, page, offset, size, flags); 2307ac5a488eSSridhar Samudrala 2308ac5a488eSSridhar Samudrala return sock_no_sendpage(sock, page, offset, size, flags); 2309ac5a488eSSridhar Samudrala } 2310ac5a488eSSridhar Samudrala 2311ac5a488eSSridhar Samudrala int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg) 2312ac5a488eSSridhar Samudrala { 2313ac5a488eSSridhar Samudrala mm_segment_t oldfs = get_fs(); 2314ac5a488eSSridhar Samudrala int err; 2315ac5a488eSSridhar Samudrala 2316ac5a488eSSridhar Samudrala set_fs(KERNEL_DS); 2317ac5a488eSSridhar Samudrala err = sock->ops->ioctl(sock, cmd, arg); 2318ac5a488eSSridhar Samudrala set_fs(oldfs); 2319ac5a488eSSridhar Samudrala 2320ac5a488eSSridhar Samudrala return err; 2321ac5a488eSSridhar Samudrala } 2322ac5a488eSSridhar Samudrala 232391cf45f0STrond Myklebust int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) 232491cf45f0STrond Myklebust { 232591cf45f0STrond Myklebust return sock->ops->shutdown(sock, how); 232691cf45f0STrond Myklebust } 232791cf45f0STrond Myklebust 23281da177e4SLinus Torvalds /* ABI emulation layers need these two */ 23291da177e4SLinus Torvalds EXPORT_SYMBOL(move_addr_to_kernel); 23301da177e4SLinus Torvalds EXPORT_SYMBOL(move_addr_to_user); 23311da177e4SLinus Torvalds EXPORT_SYMBOL(sock_create); 23321da177e4SLinus Torvalds EXPORT_SYMBOL(sock_create_kern); 23331da177e4SLinus Torvalds EXPORT_SYMBOL(sock_create_lite); 23341da177e4SLinus Torvalds EXPORT_SYMBOL(sock_map_fd); 23351da177e4SLinus Torvalds EXPORT_SYMBOL(sock_recvmsg); 23361da177e4SLinus Torvalds EXPORT_SYMBOL(sock_register); 23371da177e4SLinus Torvalds EXPORT_SYMBOL(sock_release); 23381da177e4SLinus Torvalds EXPORT_SYMBOL(sock_sendmsg); 23391da177e4SLinus Torvalds EXPORT_SYMBOL(sock_unregister); 23401da177e4SLinus Torvalds EXPORT_SYMBOL(sock_wake_async); 23411da177e4SLinus Torvalds EXPORT_SYMBOL(sockfd_lookup); 23421da177e4SLinus Torvalds EXPORT_SYMBOL(kernel_sendmsg); 23431da177e4SLinus Torvalds EXPORT_SYMBOL(kernel_recvmsg); 2344ac5a488eSSridhar Samudrala EXPORT_SYMBOL(kernel_bind); 2345ac5a488eSSridhar Samudrala EXPORT_SYMBOL(kernel_listen); 2346ac5a488eSSridhar Samudrala EXPORT_SYMBOL(kernel_accept); 2347ac5a488eSSridhar Samudrala EXPORT_SYMBOL(kernel_connect); 2348ac5a488eSSridhar Samudrala EXPORT_SYMBOL(kernel_getsockname); 2349ac5a488eSSridhar Samudrala EXPORT_SYMBOL(kernel_getpeername); 2350ac5a488eSSridhar Samudrala EXPORT_SYMBOL(kernel_getsockopt); 2351ac5a488eSSridhar Samudrala EXPORT_SYMBOL(kernel_setsockopt); 2352ac5a488eSSridhar Samudrala EXPORT_SYMBOL(kernel_sendpage); 2353ac5a488eSSridhar Samudrala EXPORT_SYMBOL(kernel_sock_ioctl); 235491cf45f0STrond Myklebust EXPORT_SYMBOL(kernel_sock_shutdown); 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