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/config.h> 621da177e4SLinus Torvalds #include <linux/mm.h> 631da177e4SLinus Torvalds #include <linux/smp_lock.h> 641da177e4SLinus Torvalds #include <linux/socket.h> 651da177e4SLinus Torvalds #include <linux/file.h> 661da177e4SLinus Torvalds #include <linux/net.h> 671da177e4SLinus Torvalds #include <linux/interrupt.h> 681da177e4SLinus Torvalds #include <linux/netdevice.h> 691da177e4SLinus Torvalds #include <linux/proc_fs.h> 701da177e4SLinus Torvalds #include <linux/seq_file.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/divert.h> 811da177e4SLinus Torvalds #include <linux/mount.h> 821da177e4SLinus Torvalds #include <linux/security.h> 831da177e4SLinus Torvalds #include <linux/syscalls.h> 841da177e4SLinus Torvalds #include <linux/compat.h> 851da177e4SLinus Torvalds #include <linux/kmod.h> 863ec3b2fbSDavid Woodhouse #include <linux/audit.h> 87d86b5e0eSAdrian Bunk #include <linux/wireless.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); 981da177e4SLinus Torvalds static ssize_t sock_aio_read(struct kiocb *iocb, char __user *buf, 991da177e4SLinus Torvalds size_t size, loff_t pos); 1001da177e4SLinus Torvalds static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *buf, 1011da177e4SLinus Torvalds size_t size, 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); 1071da177e4SLinus Torvalds static long sock_ioctl(struct file *file, 1081da177e4SLinus Torvalds unsigned int cmd, unsigned long arg); 1091da177e4SLinus Torvalds static int sock_fasync(int fd, struct file *filp, int on); 1101da177e4SLinus Torvalds static ssize_t sock_readv(struct file *file, const struct iovec *vector, 1111da177e4SLinus Torvalds unsigned long count, loff_t *ppos); 1121da177e4SLinus Torvalds static ssize_t sock_writev(struct file *file, const struct iovec *vector, 1131da177e4SLinus Torvalds unsigned long count, loff_t *ppos); 1141da177e4SLinus Torvalds static ssize_t sock_sendpage(struct file *file, struct page *page, 1151da177e4SLinus Torvalds int offset, size_t size, loff_t *ppos, int more); 1161da177e4SLinus Torvalds 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvalds /* 1191da177e4SLinus Torvalds * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear 1201da177e4SLinus Torvalds * in the operation structures but are done directly via the socketcall() multiplexor. 1211da177e4SLinus Torvalds */ 1221da177e4SLinus Torvalds 1231da177e4SLinus Torvalds static struct file_operations socket_file_ops = { 1241da177e4SLinus Torvalds .owner = THIS_MODULE, 1251da177e4SLinus Torvalds .llseek = no_llseek, 1261da177e4SLinus Torvalds .aio_read = sock_aio_read, 1271da177e4SLinus Torvalds .aio_write = sock_aio_write, 1281da177e4SLinus Torvalds .poll = sock_poll, 1291da177e4SLinus Torvalds .unlocked_ioctl = sock_ioctl, 1301da177e4SLinus Torvalds .mmap = sock_mmap, 1311da177e4SLinus Torvalds .open = sock_no_open, /* special open code to disallow open via /proc */ 1321da177e4SLinus Torvalds .release = sock_close, 1331da177e4SLinus Torvalds .fasync = sock_fasync, 1341da177e4SLinus Torvalds .readv = sock_readv, 1351da177e4SLinus Torvalds .writev = sock_writev, 1361da177e4SLinus Torvalds .sendpage = sock_sendpage 1371da177e4SLinus Torvalds }; 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds /* 1401da177e4SLinus Torvalds * The protocol list. Each protocol is registered in here. 1411da177e4SLinus Torvalds */ 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds static struct net_proto_family *net_families[NPROTO]; 1441da177e4SLinus Torvalds 1451da177e4SLinus Torvalds #if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT) 1461da177e4SLinus Torvalds static atomic_t net_family_lockct = ATOMIC_INIT(0); 1471da177e4SLinus Torvalds static DEFINE_SPINLOCK(net_family_lock); 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvalds /* The strategy is: modifications net_family vector are short, do not 1501da177e4SLinus Torvalds sleep and veeery rare, but read access should be free of any exclusive 1511da177e4SLinus Torvalds locks. 1521da177e4SLinus Torvalds */ 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds static void net_family_write_lock(void) 1551da177e4SLinus Torvalds { 1561da177e4SLinus Torvalds spin_lock(&net_family_lock); 1571da177e4SLinus Torvalds while (atomic_read(&net_family_lockct) != 0) { 1581da177e4SLinus Torvalds spin_unlock(&net_family_lock); 1591da177e4SLinus Torvalds 1601da177e4SLinus Torvalds yield(); 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds spin_lock(&net_family_lock); 1631da177e4SLinus Torvalds } 1641da177e4SLinus Torvalds } 1651da177e4SLinus Torvalds 1661da177e4SLinus Torvalds static __inline__ void net_family_write_unlock(void) 1671da177e4SLinus Torvalds { 1681da177e4SLinus Torvalds spin_unlock(&net_family_lock); 1691da177e4SLinus Torvalds } 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvalds static __inline__ void net_family_read_lock(void) 1721da177e4SLinus Torvalds { 1731da177e4SLinus Torvalds atomic_inc(&net_family_lockct); 1741da177e4SLinus Torvalds spin_unlock_wait(&net_family_lock); 1751da177e4SLinus Torvalds } 1761da177e4SLinus Torvalds 1771da177e4SLinus Torvalds static __inline__ void net_family_read_unlock(void) 1781da177e4SLinus Torvalds { 1791da177e4SLinus Torvalds atomic_dec(&net_family_lockct); 1801da177e4SLinus Torvalds } 1811da177e4SLinus Torvalds 1821da177e4SLinus Torvalds #else 1831da177e4SLinus Torvalds #define net_family_write_lock() do { } while(0) 1841da177e4SLinus Torvalds #define net_family_write_unlock() do { } while(0) 1851da177e4SLinus Torvalds #define net_family_read_lock() do { } while(0) 1861da177e4SLinus Torvalds #define net_family_read_unlock() do { } while(0) 1871da177e4SLinus Torvalds #endif 1881da177e4SLinus Torvalds 1891da177e4SLinus Torvalds 1901da177e4SLinus Torvalds /* 1911da177e4SLinus Torvalds * Statistics counters of the socket lists 1921da177e4SLinus Torvalds */ 1931da177e4SLinus Torvalds 1941da177e4SLinus Torvalds static DEFINE_PER_CPU(int, sockets_in_use) = 0; 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds /* 1971da177e4SLinus Torvalds * Support routines. Move socket addresses back and forth across the kernel/user 1981da177e4SLinus Torvalds * divide and look after the messy bits. 1991da177e4SLinus Torvalds */ 2001da177e4SLinus Torvalds 2011da177e4SLinus Torvalds #define MAX_SOCK_ADDR 128 /* 108 for Unix domain - 2021da177e4SLinus Torvalds 16 for IP, 16 for IPX, 2031da177e4SLinus Torvalds 24 for IPv6, 2041da177e4SLinus Torvalds about 80 for AX.25 2051da177e4SLinus Torvalds must be at least one bigger than 2061da177e4SLinus Torvalds the AF_UNIX size (see net/unix/af_unix.c 2071da177e4SLinus Torvalds :unix_mkname()). 2081da177e4SLinus Torvalds */ 2091da177e4SLinus Torvalds 2101da177e4SLinus Torvalds /** 2111da177e4SLinus Torvalds * move_addr_to_kernel - copy a socket address into kernel space 2121da177e4SLinus Torvalds * @uaddr: Address in user space 2131da177e4SLinus Torvalds * @kaddr: Address in kernel space 2141da177e4SLinus Torvalds * @ulen: Length in user space 2151da177e4SLinus Torvalds * 2161da177e4SLinus Torvalds * The address is copied into kernel space. If the provided address is 2171da177e4SLinus Torvalds * too long an error code of -EINVAL is returned. If the copy gives 2181da177e4SLinus Torvalds * invalid addresses -EFAULT is returned. On a success 0 is returned. 2191da177e4SLinus Torvalds */ 2201da177e4SLinus Torvalds 2211da177e4SLinus Torvalds int move_addr_to_kernel(void __user *uaddr, int ulen, void *kaddr) 2221da177e4SLinus Torvalds { 2231da177e4SLinus Torvalds if(ulen<0||ulen>MAX_SOCK_ADDR) 2241da177e4SLinus Torvalds return -EINVAL; 2251da177e4SLinus Torvalds if(ulen==0) 2261da177e4SLinus Torvalds return 0; 2271da177e4SLinus Torvalds if(copy_from_user(kaddr,uaddr,ulen)) 2281da177e4SLinus Torvalds return -EFAULT; 2293ec3b2fbSDavid Woodhouse return audit_sockaddr(ulen, kaddr); 2301da177e4SLinus Torvalds } 2311da177e4SLinus Torvalds 2321da177e4SLinus Torvalds /** 2331da177e4SLinus Torvalds * move_addr_to_user - copy an address to user space 2341da177e4SLinus Torvalds * @kaddr: kernel space address 2351da177e4SLinus Torvalds * @klen: length of address in kernel 2361da177e4SLinus Torvalds * @uaddr: user space address 2371da177e4SLinus Torvalds * @ulen: pointer to user length field 2381da177e4SLinus Torvalds * 2391da177e4SLinus Torvalds * The value pointed to by ulen on entry is the buffer length available. 2401da177e4SLinus Torvalds * This is overwritten with the buffer space used. -EINVAL is returned 2411da177e4SLinus Torvalds * if an overlong buffer is specified or a negative buffer size. -EFAULT 2421da177e4SLinus Torvalds * is returned if either the buffer or the length field are not 2431da177e4SLinus Torvalds * accessible. 2441da177e4SLinus Torvalds * After copying the data up to the limit the user specifies, the true 2451da177e4SLinus Torvalds * length of the data is written over the length limit the user 2461da177e4SLinus Torvalds * specified. Zero is returned for a success. 2471da177e4SLinus Torvalds */ 2481da177e4SLinus Torvalds 2491da177e4SLinus Torvalds int move_addr_to_user(void *kaddr, int klen, void __user *uaddr, int __user *ulen) 2501da177e4SLinus Torvalds { 2511da177e4SLinus Torvalds int err; 2521da177e4SLinus Torvalds int len; 2531da177e4SLinus Torvalds 2541da177e4SLinus Torvalds if((err=get_user(len, ulen))) 2551da177e4SLinus Torvalds return err; 2561da177e4SLinus Torvalds if(len>klen) 2571da177e4SLinus Torvalds len=klen; 2581da177e4SLinus Torvalds if(len<0 || len> MAX_SOCK_ADDR) 2591da177e4SLinus Torvalds return -EINVAL; 2601da177e4SLinus Torvalds if(len) 2611da177e4SLinus Torvalds { 2621da177e4SLinus Torvalds if(copy_to_user(uaddr,kaddr,len)) 2631da177e4SLinus Torvalds return -EFAULT; 2641da177e4SLinus Torvalds } 2651da177e4SLinus Torvalds /* 2661da177e4SLinus Torvalds * "fromlen shall refer to the value before truncation.." 2671da177e4SLinus Torvalds * 1003.1g 2681da177e4SLinus Torvalds */ 2691da177e4SLinus Torvalds return __put_user(klen, ulen); 2701da177e4SLinus Torvalds } 2711da177e4SLinus Torvalds 2721da177e4SLinus Torvalds #define SOCKFS_MAGIC 0x534F434B 2731da177e4SLinus Torvalds 274ba89966cSEric Dumazet static kmem_cache_t * sock_inode_cachep __read_mostly; 2751da177e4SLinus Torvalds 2761da177e4SLinus Torvalds static struct inode *sock_alloc_inode(struct super_block *sb) 2771da177e4SLinus Torvalds { 2781da177e4SLinus Torvalds struct socket_alloc *ei; 2791da177e4SLinus Torvalds ei = (struct socket_alloc *)kmem_cache_alloc(sock_inode_cachep, SLAB_KERNEL); 2801da177e4SLinus Torvalds if (!ei) 2811da177e4SLinus Torvalds return NULL; 2821da177e4SLinus Torvalds init_waitqueue_head(&ei->socket.wait); 2831da177e4SLinus Torvalds 2841da177e4SLinus Torvalds ei->socket.fasync_list = NULL; 2851da177e4SLinus Torvalds ei->socket.state = SS_UNCONNECTED; 2861da177e4SLinus Torvalds ei->socket.flags = 0; 2871da177e4SLinus Torvalds ei->socket.ops = NULL; 2881da177e4SLinus Torvalds ei->socket.sk = NULL; 2891da177e4SLinus Torvalds ei->socket.file = NULL; 2901da177e4SLinus Torvalds ei->socket.flags = 0; 2911da177e4SLinus Torvalds 2921da177e4SLinus Torvalds return &ei->vfs_inode; 2931da177e4SLinus Torvalds } 2941da177e4SLinus Torvalds 2951da177e4SLinus Torvalds static void sock_destroy_inode(struct inode *inode) 2961da177e4SLinus Torvalds { 2971da177e4SLinus Torvalds kmem_cache_free(sock_inode_cachep, 2981da177e4SLinus Torvalds container_of(inode, struct socket_alloc, vfs_inode)); 2991da177e4SLinus Torvalds } 3001da177e4SLinus Torvalds 3011da177e4SLinus Torvalds static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) 3021da177e4SLinus Torvalds { 3031da177e4SLinus Torvalds struct socket_alloc *ei = (struct socket_alloc *) foo; 3041da177e4SLinus Torvalds 3051da177e4SLinus Torvalds if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == 3061da177e4SLinus Torvalds SLAB_CTOR_CONSTRUCTOR) 3071da177e4SLinus Torvalds inode_init_once(&ei->vfs_inode); 3081da177e4SLinus Torvalds } 3091da177e4SLinus Torvalds 3101da177e4SLinus Torvalds static int init_inodecache(void) 3111da177e4SLinus Torvalds { 3121da177e4SLinus Torvalds sock_inode_cachep = kmem_cache_create("sock_inode_cache", 3131da177e4SLinus Torvalds sizeof(struct socket_alloc), 3141da177e4SLinus Torvalds 0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT, 3151da177e4SLinus Torvalds init_once, NULL); 3161da177e4SLinus Torvalds if (sock_inode_cachep == NULL) 3171da177e4SLinus Torvalds return -ENOMEM; 3181da177e4SLinus Torvalds return 0; 3191da177e4SLinus Torvalds } 3201da177e4SLinus Torvalds 3211da177e4SLinus Torvalds static struct super_operations sockfs_ops = { 3221da177e4SLinus Torvalds .alloc_inode = sock_alloc_inode, 3231da177e4SLinus Torvalds .destroy_inode =sock_destroy_inode, 3241da177e4SLinus Torvalds .statfs = simple_statfs, 3251da177e4SLinus Torvalds }; 3261da177e4SLinus Torvalds 3271da177e4SLinus Torvalds static struct super_block *sockfs_get_sb(struct file_system_type *fs_type, 3281da177e4SLinus Torvalds int flags, const char *dev_name, void *data) 3291da177e4SLinus Torvalds { 3301da177e4SLinus Torvalds return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC); 3311da177e4SLinus Torvalds } 3321da177e4SLinus Torvalds 333ba89966cSEric Dumazet static struct vfsmount *sock_mnt __read_mostly; 3341da177e4SLinus Torvalds 3351da177e4SLinus Torvalds static struct file_system_type sock_fs_type = { 3361da177e4SLinus Torvalds .name = "sockfs", 3371da177e4SLinus Torvalds .get_sb = sockfs_get_sb, 3381da177e4SLinus Torvalds .kill_sb = kill_anon_super, 3391da177e4SLinus Torvalds }; 3401da177e4SLinus Torvalds static int sockfs_delete_dentry(struct dentry *dentry) 3411da177e4SLinus Torvalds { 3421da177e4SLinus Torvalds return 1; 3431da177e4SLinus Torvalds } 3441da177e4SLinus Torvalds static struct dentry_operations sockfs_dentry_operations = { 3451da177e4SLinus Torvalds .d_delete = sockfs_delete_dentry, 3461da177e4SLinus Torvalds }; 3471da177e4SLinus Torvalds 3481da177e4SLinus Torvalds /* 3491da177e4SLinus Torvalds * Obtains the first available file descriptor and sets it up for use. 3501da177e4SLinus Torvalds * 351*39d8c1b6SDavid S. Miller * These functions create file structures and maps them to fd space 352*39d8c1b6SDavid S. Miller * of the current process. On success it returns file descriptor 3531da177e4SLinus Torvalds * and file struct implicitly stored in sock->file. 3541da177e4SLinus Torvalds * Note that another thread may close file descriptor before we return 3551da177e4SLinus Torvalds * from this function. We use the fact that now we do not refer 3561da177e4SLinus Torvalds * to socket after mapping. If one day we will need it, this 3571da177e4SLinus Torvalds * function will increment ref. count on file by 1. 3581da177e4SLinus Torvalds * 3591da177e4SLinus Torvalds * In any case returned fd MAY BE not valid! 3601da177e4SLinus Torvalds * This race condition is unavoidable 3611da177e4SLinus Torvalds * with shared fd spaces, we cannot solve it inside kernel, 3621da177e4SLinus Torvalds * but we take care of internal coherence yet. 3631da177e4SLinus Torvalds */ 3641da177e4SLinus Torvalds 365*39d8c1b6SDavid S. Miller static int sock_alloc_fd(struct file **filep) 3661da177e4SLinus Torvalds { 3671da177e4SLinus Torvalds int fd; 3681da177e4SLinus Torvalds 3691da177e4SLinus Torvalds fd = get_unused_fd(); 370*39d8c1b6SDavid S. Miller if (likely(fd >= 0)) { 3711da177e4SLinus Torvalds struct file *file = get_empty_filp(); 3721da177e4SLinus Torvalds 373*39d8c1b6SDavid S. Miller *filep = file; 374*39d8c1b6SDavid S. Miller if (unlikely(!file)) { 3751da177e4SLinus Torvalds put_unused_fd(fd); 376*39d8c1b6SDavid S. Miller return -ENFILE; 3771da177e4SLinus Torvalds } 378*39d8c1b6SDavid S. Miller } else 379*39d8c1b6SDavid S. Miller *filep = NULL; 380*39d8c1b6SDavid S. Miller return fd; 381*39d8c1b6SDavid S. Miller } 382*39d8c1b6SDavid S. Miller 383*39d8c1b6SDavid S. Miller static int sock_attach_fd(struct socket *sock, struct file *file) 384*39d8c1b6SDavid S. Miller { 385*39d8c1b6SDavid S. Miller struct qstr this; 386*39d8c1b6SDavid S. Miller char name[32]; 3871da177e4SLinus Torvalds 388f31f5f05SEric Dumazet this.len = sprintf(name, "[%lu]", SOCK_INODE(sock)->i_ino); 3891da177e4SLinus Torvalds this.name = name; 3901da177e4SLinus Torvalds this.hash = SOCK_INODE(sock)->i_ino; 3911da177e4SLinus Torvalds 3921da177e4SLinus Torvalds file->f_dentry = d_alloc(sock_mnt->mnt_sb->s_root, &this); 393*39d8c1b6SDavid S. Miller if (unlikely(!file->f_dentry)) 394*39d8c1b6SDavid S. Miller return -ENOMEM; 395*39d8c1b6SDavid S. Miller 3961da177e4SLinus Torvalds file->f_dentry->d_op = &sockfs_dentry_operations; 3971da177e4SLinus Torvalds d_add(file->f_dentry, SOCK_INODE(sock)); 3981da177e4SLinus Torvalds file->f_vfsmnt = mntget(sock_mnt); 3991da177e4SLinus Torvalds file->f_mapping = file->f_dentry->d_inode->i_mapping; 4001da177e4SLinus Torvalds 4011da177e4SLinus Torvalds sock->file = file; 4021da177e4SLinus Torvalds file->f_op = SOCK_INODE(sock)->i_fop = &socket_file_ops; 4031da177e4SLinus Torvalds file->f_mode = FMODE_READ | FMODE_WRITE; 4041da177e4SLinus Torvalds file->f_flags = O_RDWR; 4051da177e4SLinus Torvalds file->f_pos = 0; 40607dc3f07SBenjamin LaHaise file->private_data = sock; 407*39d8c1b6SDavid S. Miller 408*39d8c1b6SDavid S. Miller return 0; 4091da177e4SLinus Torvalds } 4101da177e4SLinus Torvalds 411*39d8c1b6SDavid S. Miller int sock_map_fd(struct socket *sock) 412*39d8c1b6SDavid S. Miller { 413*39d8c1b6SDavid S. Miller struct file *newfile; 414*39d8c1b6SDavid S. Miller int fd = sock_alloc_fd(&newfile); 415*39d8c1b6SDavid S. Miller 416*39d8c1b6SDavid S. Miller if (likely(fd >= 0)) { 417*39d8c1b6SDavid S. Miller int err = sock_attach_fd(sock, newfile); 418*39d8c1b6SDavid S. Miller 419*39d8c1b6SDavid S. Miller if (unlikely(err < 0)) { 420*39d8c1b6SDavid S. Miller put_filp(newfile); 421*39d8c1b6SDavid S. Miller put_unused_fd(fd); 422*39d8c1b6SDavid S. Miller return err; 423*39d8c1b6SDavid S. Miller } 424*39d8c1b6SDavid S. Miller fd_install(fd, newfile); 425*39d8c1b6SDavid S. Miller } 4261da177e4SLinus Torvalds return fd; 4271da177e4SLinus Torvalds } 4281da177e4SLinus Torvalds 4291da177e4SLinus Torvalds /** 4301da177e4SLinus Torvalds * sockfd_lookup - Go from a file number to its socket slot 4311da177e4SLinus Torvalds * @fd: file handle 4321da177e4SLinus Torvalds * @err: pointer to an error code return 4331da177e4SLinus Torvalds * 4341da177e4SLinus Torvalds * The file handle passed in is locked and the socket it is bound 4351da177e4SLinus Torvalds * too is returned. If an error occurs the err pointer is overwritten 4361da177e4SLinus Torvalds * with a negative errno code and NULL is returned. The function checks 4371da177e4SLinus Torvalds * for both invalid handles and passing a handle which is not a socket. 4381da177e4SLinus Torvalds * 4391da177e4SLinus Torvalds * On a success the socket object pointer is returned. 4401da177e4SLinus Torvalds */ 4411da177e4SLinus Torvalds 4421da177e4SLinus Torvalds struct socket *sockfd_lookup(int fd, int *err) 4431da177e4SLinus Torvalds { 4441da177e4SLinus Torvalds struct file *file; 4451da177e4SLinus Torvalds struct inode *inode; 4461da177e4SLinus Torvalds struct socket *sock; 4471da177e4SLinus Torvalds 4481da177e4SLinus Torvalds if (!(file = fget(fd))) 4491da177e4SLinus Torvalds { 4501da177e4SLinus Torvalds *err = -EBADF; 4511da177e4SLinus Torvalds return NULL; 4521da177e4SLinus Torvalds } 4531da177e4SLinus Torvalds 45407dc3f07SBenjamin LaHaise if (file->f_op == &socket_file_ops) 45507dc3f07SBenjamin LaHaise return file->private_data; /* set in sock_map_fd */ 45607dc3f07SBenjamin LaHaise 4571da177e4SLinus Torvalds inode = file->f_dentry->d_inode; 4581da177e4SLinus Torvalds if (!S_ISSOCK(inode->i_mode)) { 4591da177e4SLinus Torvalds *err = -ENOTSOCK; 4601da177e4SLinus Torvalds fput(file); 4611da177e4SLinus Torvalds return NULL; 4621da177e4SLinus Torvalds } 4631da177e4SLinus Torvalds 4641da177e4SLinus Torvalds sock = SOCKET_I(inode); 4651da177e4SLinus Torvalds if (sock->file != file) { 4661da177e4SLinus Torvalds printk(KERN_ERR "socki_lookup: socket file changed!\n"); 4671da177e4SLinus Torvalds sock->file = file; 4681da177e4SLinus Torvalds } 4691da177e4SLinus Torvalds return sock; 4701da177e4SLinus Torvalds } 4711da177e4SLinus Torvalds 4721da177e4SLinus Torvalds /** 4731da177e4SLinus Torvalds * sock_alloc - allocate a socket 4741da177e4SLinus Torvalds * 4751da177e4SLinus Torvalds * Allocate a new inode and socket object. The two are bound together 4761da177e4SLinus Torvalds * and initialised. The socket is then returned. If we are out of inodes 4771da177e4SLinus Torvalds * NULL is returned. 4781da177e4SLinus Torvalds */ 4791da177e4SLinus Torvalds 4801da177e4SLinus Torvalds static struct socket *sock_alloc(void) 4811da177e4SLinus Torvalds { 4821da177e4SLinus Torvalds struct inode * inode; 4831da177e4SLinus Torvalds struct socket * sock; 4841da177e4SLinus Torvalds 4851da177e4SLinus Torvalds inode = new_inode(sock_mnt->mnt_sb); 4861da177e4SLinus Torvalds if (!inode) 4871da177e4SLinus Torvalds return NULL; 4881da177e4SLinus Torvalds 4891da177e4SLinus Torvalds sock = SOCKET_I(inode); 4901da177e4SLinus Torvalds 4911da177e4SLinus Torvalds inode->i_mode = S_IFSOCK|S_IRWXUGO; 4921da177e4SLinus Torvalds inode->i_uid = current->fsuid; 4931da177e4SLinus Torvalds inode->i_gid = current->fsgid; 4941da177e4SLinus Torvalds 4951da177e4SLinus Torvalds get_cpu_var(sockets_in_use)++; 4961da177e4SLinus Torvalds put_cpu_var(sockets_in_use); 4971da177e4SLinus Torvalds return sock; 4981da177e4SLinus Torvalds } 4991da177e4SLinus Torvalds 5001da177e4SLinus Torvalds /* 5011da177e4SLinus Torvalds * In theory you can't get an open on this inode, but /proc provides 5021da177e4SLinus Torvalds * a back door. Remember to keep it shut otherwise you'll let the 5031da177e4SLinus Torvalds * creepy crawlies in. 5041da177e4SLinus Torvalds */ 5051da177e4SLinus Torvalds 5061da177e4SLinus Torvalds static int sock_no_open(struct inode *irrelevant, struct file *dontcare) 5071da177e4SLinus Torvalds { 5081da177e4SLinus Torvalds return -ENXIO; 5091da177e4SLinus Torvalds } 5101da177e4SLinus Torvalds 5111da177e4SLinus Torvalds struct file_operations bad_sock_fops = { 5121da177e4SLinus Torvalds .owner = THIS_MODULE, 5131da177e4SLinus Torvalds .open = sock_no_open, 5141da177e4SLinus Torvalds }; 5151da177e4SLinus Torvalds 5161da177e4SLinus Torvalds /** 5171da177e4SLinus Torvalds * sock_release - close a socket 5181da177e4SLinus Torvalds * @sock: socket to close 5191da177e4SLinus Torvalds * 5201da177e4SLinus Torvalds * The socket is released from the protocol stack if it has a release 5211da177e4SLinus Torvalds * callback, and the inode is then released if the socket is bound to 5221da177e4SLinus Torvalds * an inode not a file. 5231da177e4SLinus Torvalds */ 5241da177e4SLinus Torvalds 5251da177e4SLinus Torvalds void sock_release(struct socket *sock) 5261da177e4SLinus Torvalds { 5271da177e4SLinus Torvalds if (sock->ops) { 5281da177e4SLinus Torvalds struct module *owner = sock->ops->owner; 5291da177e4SLinus Torvalds 5301da177e4SLinus Torvalds sock->ops->release(sock); 5311da177e4SLinus Torvalds sock->ops = NULL; 5321da177e4SLinus Torvalds module_put(owner); 5331da177e4SLinus Torvalds } 5341da177e4SLinus Torvalds 5351da177e4SLinus Torvalds if (sock->fasync_list) 5361da177e4SLinus Torvalds printk(KERN_ERR "sock_release: fasync list not empty!\n"); 5371da177e4SLinus Torvalds 5381da177e4SLinus Torvalds get_cpu_var(sockets_in_use)--; 5391da177e4SLinus Torvalds put_cpu_var(sockets_in_use); 5401da177e4SLinus Torvalds if (!sock->file) { 5411da177e4SLinus Torvalds iput(SOCK_INODE(sock)); 5421da177e4SLinus Torvalds return; 5431da177e4SLinus Torvalds } 5441da177e4SLinus Torvalds sock->file=NULL; 5451da177e4SLinus Torvalds } 5461da177e4SLinus Torvalds 5471da177e4SLinus Torvalds static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock, 5481da177e4SLinus Torvalds struct msghdr *msg, size_t size) 5491da177e4SLinus Torvalds { 5501da177e4SLinus Torvalds struct sock_iocb *si = kiocb_to_siocb(iocb); 5511da177e4SLinus Torvalds int err; 5521da177e4SLinus Torvalds 5531da177e4SLinus Torvalds si->sock = sock; 5541da177e4SLinus Torvalds si->scm = NULL; 5551da177e4SLinus Torvalds si->msg = msg; 5561da177e4SLinus Torvalds si->size = size; 5571da177e4SLinus Torvalds 5581da177e4SLinus Torvalds err = security_socket_sendmsg(sock, msg, size); 5591da177e4SLinus Torvalds if (err) 5601da177e4SLinus Torvalds return err; 5611da177e4SLinus Torvalds 5621da177e4SLinus Torvalds return sock->ops->sendmsg(iocb, sock, msg, size); 5631da177e4SLinus Torvalds } 5641da177e4SLinus Torvalds 5651da177e4SLinus Torvalds int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 5661da177e4SLinus Torvalds { 5671da177e4SLinus Torvalds struct kiocb iocb; 5681da177e4SLinus Torvalds struct sock_iocb siocb; 5691da177e4SLinus Torvalds int ret; 5701da177e4SLinus Torvalds 5711da177e4SLinus Torvalds init_sync_kiocb(&iocb, NULL); 5721da177e4SLinus Torvalds iocb.private = &siocb; 5731da177e4SLinus Torvalds ret = __sock_sendmsg(&iocb, sock, msg, size); 5741da177e4SLinus Torvalds if (-EIOCBQUEUED == ret) 5751da177e4SLinus Torvalds ret = wait_on_sync_kiocb(&iocb); 5761da177e4SLinus Torvalds return ret; 5771da177e4SLinus Torvalds } 5781da177e4SLinus Torvalds 5791da177e4SLinus Torvalds int kernel_sendmsg(struct socket *sock, struct msghdr *msg, 5801da177e4SLinus Torvalds struct kvec *vec, size_t num, size_t size) 5811da177e4SLinus Torvalds { 5821da177e4SLinus Torvalds mm_segment_t oldfs = get_fs(); 5831da177e4SLinus Torvalds int result; 5841da177e4SLinus Torvalds 5851da177e4SLinus Torvalds set_fs(KERNEL_DS); 5861da177e4SLinus Torvalds /* 5871da177e4SLinus Torvalds * the following is safe, since for compiler definitions of kvec and 5881da177e4SLinus Torvalds * iovec are identical, yielding the same in-core layout and alignment 5891da177e4SLinus Torvalds */ 5901da177e4SLinus Torvalds msg->msg_iov = (struct iovec *)vec, 5911da177e4SLinus Torvalds msg->msg_iovlen = num; 5921da177e4SLinus Torvalds result = sock_sendmsg(sock, msg, size); 5931da177e4SLinus Torvalds set_fs(oldfs); 5941da177e4SLinus Torvalds return result; 5951da177e4SLinus Torvalds } 5961da177e4SLinus Torvalds 5971da177e4SLinus Torvalds static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock, 5981da177e4SLinus Torvalds struct msghdr *msg, size_t size, int flags) 5991da177e4SLinus Torvalds { 6001da177e4SLinus Torvalds int err; 6011da177e4SLinus Torvalds struct sock_iocb *si = kiocb_to_siocb(iocb); 6021da177e4SLinus Torvalds 6031da177e4SLinus Torvalds si->sock = sock; 6041da177e4SLinus Torvalds si->scm = NULL; 6051da177e4SLinus Torvalds si->msg = msg; 6061da177e4SLinus Torvalds si->size = size; 6071da177e4SLinus Torvalds si->flags = flags; 6081da177e4SLinus Torvalds 6091da177e4SLinus Torvalds err = security_socket_recvmsg(sock, msg, size, flags); 6101da177e4SLinus Torvalds if (err) 6111da177e4SLinus Torvalds return err; 6121da177e4SLinus Torvalds 6131da177e4SLinus Torvalds return sock->ops->recvmsg(iocb, sock, msg, size, flags); 6141da177e4SLinus Torvalds } 6151da177e4SLinus Torvalds 6161da177e4SLinus Torvalds int sock_recvmsg(struct socket *sock, struct msghdr *msg, 6171da177e4SLinus Torvalds size_t size, int flags) 6181da177e4SLinus Torvalds { 6191da177e4SLinus Torvalds struct kiocb iocb; 6201da177e4SLinus Torvalds struct sock_iocb siocb; 6211da177e4SLinus Torvalds int ret; 6221da177e4SLinus Torvalds 6231da177e4SLinus Torvalds init_sync_kiocb(&iocb, NULL); 6241da177e4SLinus Torvalds iocb.private = &siocb; 6251da177e4SLinus Torvalds ret = __sock_recvmsg(&iocb, sock, msg, size, flags); 6261da177e4SLinus Torvalds if (-EIOCBQUEUED == ret) 6271da177e4SLinus Torvalds ret = wait_on_sync_kiocb(&iocb); 6281da177e4SLinus Torvalds return ret; 6291da177e4SLinus Torvalds } 6301da177e4SLinus Torvalds 6311da177e4SLinus Torvalds int kernel_recvmsg(struct socket *sock, struct msghdr *msg, 6321da177e4SLinus Torvalds struct kvec *vec, size_t num, 6331da177e4SLinus Torvalds size_t size, int flags) 6341da177e4SLinus Torvalds { 6351da177e4SLinus Torvalds mm_segment_t oldfs = get_fs(); 6361da177e4SLinus Torvalds int result; 6371da177e4SLinus Torvalds 6381da177e4SLinus Torvalds set_fs(KERNEL_DS); 6391da177e4SLinus Torvalds /* 6401da177e4SLinus Torvalds * the following is safe, since for compiler definitions of kvec and 6411da177e4SLinus Torvalds * iovec are identical, yielding the same in-core layout and alignment 6421da177e4SLinus Torvalds */ 6431da177e4SLinus Torvalds msg->msg_iov = (struct iovec *)vec, 6441da177e4SLinus Torvalds msg->msg_iovlen = num; 6451da177e4SLinus Torvalds result = sock_recvmsg(sock, msg, size, flags); 6461da177e4SLinus Torvalds set_fs(oldfs); 6471da177e4SLinus Torvalds return result; 6481da177e4SLinus Torvalds } 6491da177e4SLinus Torvalds 6501da177e4SLinus Torvalds static void sock_aio_dtor(struct kiocb *iocb) 6511da177e4SLinus Torvalds { 6521da177e4SLinus Torvalds kfree(iocb->private); 6531da177e4SLinus Torvalds } 6541da177e4SLinus Torvalds 65520380731SArnaldo Carvalho de Melo static ssize_t sock_sendpage(struct file *file, struct page *page, 6561da177e4SLinus Torvalds int offset, size_t size, loff_t *ppos, int more) 6571da177e4SLinus Torvalds { 6581da177e4SLinus Torvalds struct socket *sock; 6591da177e4SLinus Torvalds int flags; 6601da177e4SLinus Torvalds 661b69aee04SEric Dumazet sock = file->private_data; 6621da177e4SLinus Torvalds 6631da177e4SLinus Torvalds flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; 6641da177e4SLinus Torvalds if (more) 6651da177e4SLinus Torvalds flags |= MSG_MORE; 6661da177e4SLinus Torvalds 6671da177e4SLinus Torvalds return sock->ops->sendpage(sock, page, offset, size, flags); 6681da177e4SLinus Torvalds } 6691da177e4SLinus Torvalds 670ce1d4d3eSChristoph Hellwig static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb, 671ce1d4d3eSChristoph Hellwig char __user *ubuf, size_t size, struct sock_iocb *siocb) 672ce1d4d3eSChristoph Hellwig { 673ce1d4d3eSChristoph Hellwig if (!is_sync_kiocb(iocb)) { 674ce1d4d3eSChristoph Hellwig siocb = kmalloc(sizeof(*siocb), GFP_KERNEL); 675ce1d4d3eSChristoph Hellwig if (!siocb) 676ce1d4d3eSChristoph Hellwig return NULL; 677ce1d4d3eSChristoph Hellwig iocb->ki_dtor = sock_aio_dtor; 678ce1d4d3eSChristoph Hellwig } 679ce1d4d3eSChristoph Hellwig 680ce1d4d3eSChristoph Hellwig siocb->kiocb = iocb; 681ce1d4d3eSChristoph Hellwig siocb->async_iov.iov_base = ubuf; 682ce1d4d3eSChristoph Hellwig siocb->async_iov.iov_len = size; 683ce1d4d3eSChristoph Hellwig 684ce1d4d3eSChristoph Hellwig iocb->private = siocb; 685ce1d4d3eSChristoph Hellwig return siocb; 686ce1d4d3eSChristoph Hellwig } 687ce1d4d3eSChristoph Hellwig 688ce1d4d3eSChristoph Hellwig static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb, 689ce1d4d3eSChristoph Hellwig struct file *file, struct iovec *iov, unsigned long nr_segs) 690ce1d4d3eSChristoph Hellwig { 691ce1d4d3eSChristoph Hellwig struct socket *sock = file->private_data; 692ce1d4d3eSChristoph Hellwig size_t size = 0; 693ce1d4d3eSChristoph Hellwig int i; 694ce1d4d3eSChristoph Hellwig 695ce1d4d3eSChristoph Hellwig for (i = 0 ; i < nr_segs ; i++) 696ce1d4d3eSChristoph Hellwig size += iov[i].iov_len; 697ce1d4d3eSChristoph Hellwig 698ce1d4d3eSChristoph Hellwig msg->msg_name = NULL; 699ce1d4d3eSChristoph Hellwig msg->msg_namelen = 0; 700ce1d4d3eSChristoph Hellwig msg->msg_control = NULL; 701ce1d4d3eSChristoph Hellwig msg->msg_controllen = 0; 702ce1d4d3eSChristoph Hellwig msg->msg_iov = (struct iovec *) iov; 703ce1d4d3eSChristoph Hellwig msg->msg_iovlen = nr_segs; 704ce1d4d3eSChristoph Hellwig msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; 705ce1d4d3eSChristoph Hellwig 706ce1d4d3eSChristoph Hellwig return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags); 707ce1d4d3eSChristoph Hellwig } 708ce1d4d3eSChristoph Hellwig 709ce1d4d3eSChristoph Hellwig static ssize_t sock_readv(struct file *file, const struct iovec *iov, 710ce1d4d3eSChristoph Hellwig unsigned long nr_segs, loff_t *ppos) 711ce1d4d3eSChristoph Hellwig { 712ce1d4d3eSChristoph Hellwig struct kiocb iocb; 713ce1d4d3eSChristoph Hellwig struct sock_iocb siocb; 714ce1d4d3eSChristoph Hellwig struct msghdr msg; 715ce1d4d3eSChristoph Hellwig int ret; 716ce1d4d3eSChristoph Hellwig 717ce1d4d3eSChristoph Hellwig init_sync_kiocb(&iocb, NULL); 718ce1d4d3eSChristoph Hellwig iocb.private = &siocb; 719ce1d4d3eSChristoph Hellwig 720ce1d4d3eSChristoph Hellwig ret = do_sock_read(&msg, &iocb, file, (struct iovec *)iov, nr_segs); 721ce1d4d3eSChristoph Hellwig if (-EIOCBQUEUED == ret) 722ce1d4d3eSChristoph Hellwig ret = wait_on_sync_kiocb(&iocb); 723ce1d4d3eSChristoph Hellwig return ret; 724ce1d4d3eSChristoph Hellwig } 725ce1d4d3eSChristoph Hellwig 726ce1d4d3eSChristoph Hellwig static ssize_t sock_aio_read(struct kiocb *iocb, char __user *ubuf, 727ce1d4d3eSChristoph Hellwig size_t count, loff_t pos) 728ce1d4d3eSChristoph Hellwig { 729ce1d4d3eSChristoph Hellwig struct sock_iocb siocb, *x; 730ce1d4d3eSChristoph Hellwig 731ce1d4d3eSChristoph Hellwig if (pos != 0) 732ce1d4d3eSChristoph Hellwig return -ESPIPE; 733ce1d4d3eSChristoph Hellwig if (count == 0) /* Match SYS5 behaviour */ 734ce1d4d3eSChristoph Hellwig return 0; 735ce1d4d3eSChristoph Hellwig 736ce1d4d3eSChristoph Hellwig x = alloc_sock_iocb(iocb, ubuf, count, &siocb); 737ce1d4d3eSChristoph Hellwig if (!x) 738ce1d4d3eSChristoph Hellwig return -ENOMEM; 739ce1d4d3eSChristoph Hellwig return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, 740ce1d4d3eSChristoph Hellwig &x->async_iov, 1); 741ce1d4d3eSChristoph Hellwig } 742ce1d4d3eSChristoph Hellwig 743ce1d4d3eSChristoph Hellwig static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb, 744ce1d4d3eSChristoph Hellwig struct file *file, struct iovec *iov, unsigned long nr_segs) 745ce1d4d3eSChristoph Hellwig { 746ce1d4d3eSChristoph Hellwig struct socket *sock = file->private_data; 747ce1d4d3eSChristoph Hellwig size_t size = 0; 748ce1d4d3eSChristoph Hellwig int i; 749ce1d4d3eSChristoph Hellwig 750ce1d4d3eSChristoph Hellwig for (i = 0 ; i < nr_segs ; i++) 751ce1d4d3eSChristoph Hellwig size += iov[i].iov_len; 752ce1d4d3eSChristoph Hellwig 753ce1d4d3eSChristoph Hellwig msg->msg_name = NULL; 754ce1d4d3eSChristoph Hellwig msg->msg_namelen = 0; 755ce1d4d3eSChristoph Hellwig msg->msg_control = NULL; 756ce1d4d3eSChristoph Hellwig msg->msg_controllen = 0; 757ce1d4d3eSChristoph Hellwig msg->msg_iov = (struct iovec *) iov; 758ce1d4d3eSChristoph Hellwig msg->msg_iovlen = nr_segs; 759ce1d4d3eSChristoph Hellwig msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; 760ce1d4d3eSChristoph Hellwig if (sock->type == SOCK_SEQPACKET) 761ce1d4d3eSChristoph Hellwig msg->msg_flags |= MSG_EOR; 762ce1d4d3eSChristoph Hellwig 763ce1d4d3eSChristoph Hellwig return __sock_sendmsg(iocb, sock, msg, size); 764ce1d4d3eSChristoph Hellwig } 765ce1d4d3eSChristoph Hellwig 766ce1d4d3eSChristoph Hellwig static ssize_t sock_writev(struct file *file, const struct iovec *iov, 767ce1d4d3eSChristoph Hellwig unsigned long nr_segs, loff_t *ppos) 7681da177e4SLinus Torvalds { 7691da177e4SLinus Torvalds struct msghdr msg; 770ce1d4d3eSChristoph Hellwig struct kiocb iocb; 771ce1d4d3eSChristoph Hellwig struct sock_iocb siocb; 772ce1d4d3eSChristoph Hellwig int ret; 7731da177e4SLinus Torvalds 774ce1d4d3eSChristoph Hellwig init_sync_kiocb(&iocb, NULL); 775ce1d4d3eSChristoph Hellwig iocb.private = &siocb; 7761da177e4SLinus Torvalds 777ce1d4d3eSChristoph Hellwig ret = do_sock_write(&msg, &iocb, file, (struct iovec *)iov, nr_segs); 778ce1d4d3eSChristoph Hellwig if (-EIOCBQUEUED == ret) 779ce1d4d3eSChristoph Hellwig ret = wait_on_sync_kiocb(&iocb); 780ce1d4d3eSChristoph Hellwig return ret; 7811da177e4SLinus Torvalds } 7821da177e4SLinus Torvalds 783ce1d4d3eSChristoph Hellwig static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *ubuf, 784ce1d4d3eSChristoph Hellwig size_t count, loff_t pos) 7851da177e4SLinus Torvalds { 786ce1d4d3eSChristoph Hellwig struct sock_iocb siocb, *x; 7871da177e4SLinus Torvalds 788ce1d4d3eSChristoph Hellwig if (pos != 0) 789ce1d4d3eSChristoph Hellwig return -ESPIPE; 790ce1d4d3eSChristoph Hellwig if (count == 0) /* Match SYS5 behaviour */ 791ce1d4d3eSChristoph Hellwig return 0; 792ce1d4d3eSChristoph Hellwig 793ce1d4d3eSChristoph Hellwig x = alloc_sock_iocb(iocb, (void __user *)ubuf, count, &siocb); 794ce1d4d3eSChristoph Hellwig if (!x) 795ce1d4d3eSChristoph Hellwig return -ENOMEM; 796ce1d4d3eSChristoph Hellwig 797ce1d4d3eSChristoph Hellwig return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, 798ce1d4d3eSChristoph Hellwig &x->async_iov, 1); 7991da177e4SLinus Torvalds } 8001da177e4SLinus Torvalds 8011da177e4SLinus Torvalds 8021da177e4SLinus Torvalds /* 8031da177e4SLinus Torvalds * Atomic setting of ioctl hooks to avoid race 8041da177e4SLinus Torvalds * with module unload. 8051da177e4SLinus Torvalds */ 8061da177e4SLinus Torvalds 8071da177e4SLinus Torvalds static DECLARE_MUTEX(br_ioctl_mutex); 8081da177e4SLinus Torvalds static int (*br_ioctl_hook)(unsigned int cmd, void __user *arg) = NULL; 8091da177e4SLinus Torvalds 8101da177e4SLinus Torvalds void brioctl_set(int (*hook)(unsigned int, void __user *)) 8111da177e4SLinus Torvalds { 8121da177e4SLinus Torvalds down(&br_ioctl_mutex); 8131da177e4SLinus Torvalds br_ioctl_hook = hook; 8141da177e4SLinus Torvalds up(&br_ioctl_mutex); 8151da177e4SLinus Torvalds } 8161da177e4SLinus Torvalds EXPORT_SYMBOL(brioctl_set); 8171da177e4SLinus Torvalds 8181da177e4SLinus Torvalds static DECLARE_MUTEX(vlan_ioctl_mutex); 8191da177e4SLinus Torvalds static int (*vlan_ioctl_hook)(void __user *arg); 8201da177e4SLinus Torvalds 8211da177e4SLinus Torvalds void vlan_ioctl_set(int (*hook)(void __user *)) 8221da177e4SLinus Torvalds { 8231da177e4SLinus Torvalds down(&vlan_ioctl_mutex); 8241da177e4SLinus Torvalds vlan_ioctl_hook = hook; 8251da177e4SLinus Torvalds up(&vlan_ioctl_mutex); 8261da177e4SLinus Torvalds } 8271da177e4SLinus Torvalds EXPORT_SYMBOL(vlan_ioctl_set); 8281da177e4SLinus Torvalds 8291da177e4SLinus Torvalds static DECLARE_MUTEX(dlci_ioctl_mutex); 8301da177e4SLinus Torvalds static int (*dlci_ioctl_hook)(unsigned int, void __user *); 8311da177e4SLinus Torvalds 8321da177e4SLinus Torvalds void dlci_ioctl_set(int (*hook)(unsigned int, void __user *)) 8331da177e4SLinus Torvalds { 8341da177e4SLinus Torvalds down(&dlci_ioctl_mutex); 8351da177e4SLinus Torvalds dlci_ioctl_hook = hook; 8361da177e4SLinus Torvalds up(&dlci_ioctl_mutex); 8371da177e4SLinus Torvalds } 8381da177e4SLinus Torvalds EXPORT_SYMBOL(dlci_ioctl_set); 8391da177e4SLinus Torvalds 8401da177e4SLinus Torvalds /* 8411da177e4SLinus Torvalds * With an ioctl, arg may well be a user mode pointer, but we don't know 8421da177e4SLinus Torvalds * what to do with it - that's up to the protocol still. 8431da177e4SLinus Torvalds */ 8441da177e4SLinus Torvalds 8451da177e4SLinus Torvalds static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) 8461da177e4SLinus Torvalds { 8471da177e4SLinus Torvalds struct socket *sock; 8481da177e4SLinus Torvalds void __user *argp = (void __user *)arg; 8491da177e4SLinus Torvalds int pid, err; 8501da177e4SLinus Torvalds 851b69aee04SEric Dumazet sock = file->private_data; 8521da177e4SLinus Torvalds if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { 8531da177e4SLinus Torvalds err = dev_ioctl(cmd, argp); 8541da177e4SLinus Torvalds } else 855d86b5e0eSAdrian Bunk #ifdef CONFIG_WIRELESS_EXT 8561da177e4SLinus Torvalds if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { 8571da177e4SLinus Torvalds err = dev_ioctl(cmd, argp); 8581da177e4SLinus Torvalds } else 859d86b5e0eSAdrian Bunk #endif /* CONFIG_WIRELESS_EXT */ 8601da177e4SLinus Torvalds switch (cmd) { 8611da177e4SLinus Torvalds case FIOSETOWN: 8621da177e4SLinus Torvalds case SIOCSPGRP: 8631da177e4SLinus Torvalds err = -EFAULT; 8641da177e4SLinus Torvalds if (get_user(pid, (int __user *)argp)) 8651da177e4SLinus Torvalds break; 8661da177e4SLinus Torvalds err = f_setown(sock->file, pid, 1); 8671da177e4SLinus Torvalds break; 8681da177e4SLinus Torvalds case FIOGETOWN: 8691da177e4SLinus Torvalds case SIOCGPGRP: 8701da177e4SLinus Torvalds err = put_user(sock->file->f_owner.pid, (int __user *)argp); 8711da177e4SLinus Torvalds break; 8721da177e4SLinus Torvalds case SIOCGIFBR: 8731da177e4SLinus Torvalds case SIOCSIFBR: 8741da177e4SLinus Torvalds case SIOCBRADDBR: 8751da177e4SLinus Torvalds case SIOCBRDELBR: 8761da177e4SLinus Torvalds err = -ENOPKG; 8771da177e4SLinus Torvalds if (!br_ioctl_hook) 8781da177e4SLinus Torvalds request_module("bridge"); 8791da177e4SLinus Torvalds 8801da177e4SLinus Torvalds down(&br_ioctl_mutex); 8811da177e4SLinus Torvalds if (br_ioctl_hook) 8821da177e4SLinus Torvalds err = br_ioctl_hook(cmd, argp); 8831da177e4SLinus Torvalds up(&br_ioctl_mutex); 8841da177e4SLinus Torvalds break; 8851da177e4SLinus Torvalds case SIOCGIFVLAN: 8861da177e4SLinus Torvalds case SIOCSIFVLAN: 8871da177e4SLinus Torvalds err = -ENOPKG; 8881da177e4SLinus Torvalds if (!vlan_ioctl_hook) 8891da177e4SLinus Torvalds request_module("8021q"); 8901da177e4SLinus Torvalds 8911da177e4SLinus Torvalds down(&vlan_ioctl_mutex); 8921da177e4SLinus Torvalds if (vlan_ioctl_hook) 8931da177e4SLinus Torvalds err = vlan_ioctl_hook(argp); 8941da177e4SLinus Torvalds up(&vlan_ioctl_mutex); 8951da177e4SLinus Torvalds break; 8961da177e4SLinus Torvalds case SIOCGIFDIVERT: 8971da177e4SLinus Torvalds case SIOCSIFDIVERT: 8981da177e4SLinus Torvalds /* Convert this to call through a hook */ 8991da177e4SLinus Torvalds err = divert_ioctl(cmd, argp); 9001da177e4SLinus Torvalds break; 9011da177e4SLinus Torvalds case SIOCADDDLCI: 9021da177e4SLinus Torvalds case SIOCDELDLCI: 9031da177e4SLinus Torvalds err = -ENOPKG; 9041da177e4SLinus Torvalds if (!dlci_ioctl_hook) 9051da177e4SLinus Torvalds request_module("dlci"); 9061da177e4SLinus Torvalds 9071da177e4SLinus Torvalds if (dlci_ioctl_hook) { 9081da177e4SLinus Torvalds down(&dlci_ioctl_mutex); 9091da177e4SLinus Torvalds err = dlci_ioctl_hook(cmd, argp); 9101da177e4SLinus Torvalds up(&dlci_ioctl_mutex); 9111da177e4SLinus Torvalds } 9121da177e4SLinus Torvalds break; 9131da177e4SLinus Torvalds default: 9141da177e4SLinus Torvalds err = sock->ops->ioctl(sock, cmd, arg); 915b5e5fa5eSChristoph Hellwig 916b5e5fa5eSChristoph Hellwig /* 917b5e5fa5eSChristoph Hellwig * If this ioctl is unknown try to hand it down 918b5e5fa5eSChristoph Hellwig * to the NIC driver. 919b5e5fa5eSChristoph Hellwig */ 920b5e5fa5eSChristoph Hellwig if (err == -ENOIOCTLCMD) 921b5e5fa5eSChristoph Hellwig err = dev_ioctl(cmd, argp); 9221da177e4SLinus Torvalds break; 9231da177e4SLinus Torvalds } 9241da177e4SLinus Torvalds return err; 9251da177e4SLinus Torvalds } 9261da177e4SLinus Torvalds 9271da177e4SLinus Torvalds int sock_create_lite(int family, int type, int protocol, struct socket **res) 9281da177e4SLinus Torvalds { 9291da177e4SLinus Torvalds int err; 9301da177e4SLinus Torvalds struct socket *sock = NULL; 9311da177e4SLinus Torvalds 9321da177e4SLinus Torvalds err = security_socket_create(family, type, protocol, 1); 9331da177e4SLinus Torvalds if (err) 9341da177e4SLinus Torvalds goto out; 9351da177e4SLinus Torvalds 9361da177e4SLinus Torvalds sock = sock_alloc(); 9371da177e4SLinus Torvalds if (!sock) { 9381da177e4SLinus Torvalds err = -ENOMEM; 9391da177e4SLinus Torvalds goto out; 9401da177e4SLinus Torvalds } 9411da177e4SLinus Torvalds 9421da177e4SLinus Torvalds security_socket_post_create(sock, family, type, protocol, 1); 9431da177e4SLinus Torvalds sock->type = type; 9441da177e4SLinus Torvalds out: 9451da177e4SLinus Torvalds *res = sock; 9461da177e4SLinus Torvalds return err; 9471da177e4SLinus Torvalds } 9481da177e4SLinus Torvalds 9491da177e4SLinus Torvalds /* No kernel lock held - perfect */ 9501da177e4SLinus Torvalds static unsigned int sock_poll(struct file *file, poll_table * wait) 9511da177e4SLinus Torvalds { 9521da177e4SLinus Torvalds struct socket *sock; 9531da177e4SLinus Torvalds 9541da177e4SLinus Torvalds /* 9551da177e4SLinus Torvalds * We can't return errors to poll, so it's either yes or no. 9561da177e4SLinus Torvalds */ 957b69aee04SEric Dumazet sock = file->private_data; 9581da177e4SLinus Torvalds return sock->ops->poll(file, sock, wait); 9591da177e4SLinus Torvalds } 9601da177e4SLinus Torvalds 9611da177e4SLinus Torvalds static int sock_mmap(struct file * file, struct vm_area_struct * vma) 9621da177e4SLinus Torvalds { 963b69aee04SEric Dumazet struct socket *sock = file->private_data; 9641da177e4SLinus Torvalds 9651da177e4SLinus Torvalds return sock->ops->mmap(file, sock, vma); 9661da177e4SLinus Torvalds } 9671da177e4SLinus Torvalds 96820380731SArnaldo Carvalho de Melo static int sock_close(struct inode *inode, struct file *filp) 9691da177e4SLinus Torvalds { 9701da177e4SLinus Torvalds /* 9711da177e4SLinus Torvalds * It was possible the inode is NULL we were 9721da177e4SLinus Torvalds * closing an unfinished socket. 9731da177e4SLinus Torvalds */ 9741da177e4SLinus Torvalds 9751da177e4SLinus Torvalds if (!inode) 9761da177e4SLinus Torvalds { 9771da177e4SLinus Torvalds printk(KERN_DEBUG "sock_close: NULL inode\n"); 9781da177e4SLinus Torvalds return 0; 9791da177e4SLinus Torvalds } 9801da177e4SLinus Torvalds sock_fasync(-1, filp, 0); 9811da177e4SLinus Torvalds sock_release(SOCKET_I(inode)); 9821da177e4SLinus Torvalds return 0; 9831da177e4SLinus Torvalds } 9841da177e4SLinus Torvalds 9851da177e4SLinus Torvalds /* 9861da177e4SLinus Torvalds * Update the socket async list 9871da177e4SLinus Torvalds * 9881da177e4SLinus Torvalds * Fasync_list locking strategy. 9891da177e4SLinus Torvalds * 9901da177e4SLinus Torvalds * 1. fasync_list is modified only under process context socket lock 9911da177e4SLinus Torvalds * i.e. under semaphore. 9921da177e4SLinus Torvalds * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) 9931da177e4SLinus Torvalds * or under socket lock. 9941da177e4SLinus Torvalds * 3. fasync_list can be used from softirq context, so that 9951da177e4SLinus Torvalds * modification under socket lock have to be enhanced with 9961da177e4SLinus Torvalds * write_lock_bh(&sk->sk_callback_lock). 9971da177e4SLinus Torvalds * --ANK (990710) 9981da177e4SLinus Torvalds */ 9991da177e4SLinus Torvalds 10001da177e4SLinus Torvalds static int sock_fasync(int fd, struct file *filp, int on) 10011da177e4SLinus Torvalds { 10021da177e4SLinus Torvalds struct fasync_struct *fa, *fna=NULL, **prev; 10031da177e4SLinus Torvalds struct socket *sock; 10041da177e4SLinus Torvalds struct sock *sk; 10051da177e4SLinus Torvalds 10061da177e4SLinus Torvalds if (on) 10071da177e4SLinus Torvalds { 10088b3a7005SKris Katterjohn fna = kmalloc(sizeof(struct fasync_struct), GFP_KERNEL); 10091da177e4SLinus Torvalds if(fna==NULL) 10101da177e4SLinus Torvalds return -ENOMEM; 10111da177e4SLinus Torvalds } 10121da177e4SLinus Torvalds 1013b69aee04SEric Dumazet sock = filp->private_data; 10141da177e4SLinus Torvalds 10151da177e4SLinus Torvalds if ((sk=sock->sk) == NULL) { 10161da177e4SLinus Torvalds kfree(fna); 10171da177e4SLinus Torvalds return -EINVAL; 10181da177e4SLinus Torvalds } 10191da177e4SLinus Torvalds 10201da177e4SLinus Torvalds lock_sock(sk); 10211da177e4SLinus Torvalds 10221da177e4SLinus Torvalds prev=&(sock->fasync_list); 10231da177e4SLinus Torvalds 10241da177e4SLinus Torvalds for (fa=*prev; fa!=NULL; prev=&fa->fa_next,fa=*prev) 10251da177e4SLinus Torvalds if (fa->fa_file==filp) 10261da177e4SLinus Torvalds break; 10271da177e4SLinus Torvalds 10281da177e4SLinus Torvalds if(on) 10291da177e4SLinus Torvalds { 10301da177e4SLinus Torvalds if(fa!=NULL) 10311da177e4SLinus Torvalds { 10321da177e4SLinus Torvalds write_lock_bh(&sk->sk_callback_lock); 10331da177e4SLinus Torvalds fa->fa_fd=fd; 10341da177e4SLinus Torvalds write_unlock_bh(&sk->sk_callback_lock); 10351da177e4SLinus Torvalds 10361da177e4SLinus Torvalds kfree(fna); 10371da177e4SLinus Torvalds goto out; 10381da177e4SLinus Torvalds } 10391da177e4SLinus Torvalds fna->fa_file=filp; 10401da177e4SLinus Torvalds fna->fa_fd=fd; 10411da177e4SLinus Torvalds fna->magic=FASYNC_MAGIC; 10421da177e4SLinus Torvalds fna->fa_next=sock->fasync_list; 10431da177e4SLinus Torvalds write_lock_bh(&sk->sk_callback_lock); 10441da177e4SLinus Torvalds sock->fasync_list=fna; 10451da177e4SLinus Torvalds write_unlock_bh(&sk->sk_callback_lock); 10461da177e4SLinus Torvalds } 10471da177e4SLinus Torvalds else 10481da177e4SLinus Torvalds { 10491da177e4SLinus Torvalds if (fa!=NULL) 10501da177e4SLinus Torvalds { 10511da177e4SLinus Torvalds write_lock_bh(&sk->sk_callback_lock); 10521da177e4SLinus Torvalds *prev=fa->fa_next; 10531da177e4SLinus Torvalds write_unlock_bh(&sk->sk_callback_lock); 10541da177e4SLinus Torvalds kfree(fa); 10551da177e4SLinus Torvalds } 10561da177e4SLinus Torvalds } 10571da177e4SLinus Torvalds 10581da177e4SLinus Torvalds out: 10591da177e4SLinus Torvalds release_sock(sock->sk); 10601da177e4SLinus Torvalds return 0; 10611da177e4SLinus Torvalds } 10621da177e4SLinus Torvalds 10631da177e4SLinus Torvalds /* This function may be called only under socket lock or callback_lock */ 10641da177e4SLinus Torvalds 10651da177e4SLinus Torvalds int sock_wake_async(struct socket *sock, int how, int band) 10661da177e4SLinus Torvalds { 10671da177e4SLinus Torvalds if (!sock || !sock->fasync_list) 10681da177e4SLinus Torvalds return -1; 10691da177e4SLinus Torvalds switch (how) 10701da177e4SLinus Torvalds { 10711da177e4SLinus Torvalds case 1: 10721da177e4SLinus Torvalds 10731da177e4SLinus Torvalds if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags)) 10741da177e4SLinus Torvalds break; 10751da177e4SLinus Torvalds goto call_kill; 10761da177e4SLinus Torvalds case 2: 10771da177e4SLinus Torvalds if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags)) 10781da177e4SLinus Torvalds break; 10791da177e4SLinus Torvalds /* fall through */ 10801da177e4SLinus Torvalds case 0: 10811da177e4SLinus Torvalds call_kill: 10821da177e4SLinus Torvalds __kill_fasync(sock->fasync_list, SIGIO, band); 10831da177e4SLinus Torvalds break; 10841da177e4SLinus Torvalds case 3: 10851da177e4SLinus Torvalds __kill_fasync(sock->fasync_list, SIGURG, band); 10861da177e4SLinus Torvalds } 10871da177e4SLinus Torvalds return 0; 10881da177e4SLinus Torvalds } 10891da177e4SLinus Torvalds 10901da177e4SLinus Torvalds static int __sock_create(int family, int type, int protocol, struct socket **res, int kern) 10911da177e4SLinus Torvalds { 10921da177e4SLinus Torvalds int err; 10931da177e4SLinus Torvalds struct socket *sock; 10941da177e4SLinus Torvalds 10951da177e4SLinus Torvalds /* 10961da177e4SLinus Torvalds * Check protocol is in range 10971da177e4SLinus Torvalds */ 10981da177e4SLinus Torvalds if (family < 0 || family >= NPROTO) 10991da177e4SLinus Torvalds return -EAFNOSUPPORT; 11001da177e4SLinus Torvalds if (type < 0 || type >= SOCK_MAX) 11011da177e4SLinus Torvalds return -EINVAL; 11021da177e4SLinus Torvalds 11031da177e4SLinus Torvalds /* Compatibility. 11041da177e4SLinus Torvalds 11051da177e4SLinus Torvalds This uglymoron is moved from INET layer to here to avoid 11061da177e4SLinus Torvalds deadlock in module load. 11071da177e4SLinus Torvalds */ 11081da177e4SLinus Torvalds if (family == PF_INET && type == SOCK_PACKET) { 11091da177e4SLinus Torvalds static int warned; 11101da177e4SLinus Torvalds if (!warned) { 11111da177e4SLinus Torvalds warned = 1; 11121da177e4SLinus Torvalds printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n", current->comm); 11131da177e4SLinus Torvalds } 11141da177e4SLinus Torvalds family = PF_PACKET; 11151da177e4SLinus Torvalds } 11161da177e4SLinus Torvalds 11171da177e4SLinus Torvalds err = security_socket_create(family, type, protocol, kern); 11181da177e4SLinus Torvalds if (err) 11191da177e4SLinus Torvalds return err; 11201da177e4SLinus Torvalds 11211da177e4SLinus Torvalds #if defined(CONFIG_KMOD) 11221da177e4SLinus Torvalds /* Attempt to load a protocol module if the find failed. 11231da177e4SLinus Torvalds * 11241da177e4SLinus Torvalds * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user 11251da177e4SLinus Torvalds * requested real, full-featured networking support upon configuration. 11261da177e4SLinus Torvalds * Otherwise module support will break! 11271da177e4SLinus Torvalds */ 11281da177e4SLinus Torvalds if (net_families[family]==NULL) 11291da177e4SLinus Torvalds { 11301da177e4SLinus Torvalds request_module("net-pf-%d",family); 11311da177e4SLinus Torvalds } 11321da177e4SLinus Torvalds #endif 11331da177e4SLinus Torvalds 11341da177e4SLinus Torvalds net_family_read_lock(); 11351da177e4SLinus Torvalds if (net_families[family] == NULL) { 11361da177e4SLinus Torvalds err = -EAFNOSUPPORT; 11371da177e4SLinus Torvalds goto out; 11381da177e4SLinus Torvalds } 11391da177e4SLinus Torvalds 11401da177e4SLinus Torvalds /* 11411da177e4SLinus Torvalds * Allocate the socket and allow the family to set things up. if 11421da177e4SLinus Torvalds * the protocol is 0, the family is instructed to select an appropriate 11431da177e4SLinus Torvalds * default. 11441da177e4SLinus Torvalds */ 11451da177e4SLinus Torvalds 11461da177e4SLinus Torvalds if (!(sock = sock_alloc())) { 11471da177e4SLinus Torvalds printk(KERN_WARNING "socket: no more sockets\n"); 11481da177e4SLinus Torvalds err = -ENFILE; /* Not exactly a match, but its the 11491da177e4SLinus Torvalds closest posix thing */ 11501da177e4SLinus Torvalds goto out; 11511da177e4SLinus Torvalds } 11521da177e4SLinus Torvalds 11531da177e4SLinus Torvalds sock->type = type; 11541da177e4SLinus Torvalds 11551da177e4SLinus Torvalds /* 11561da177e4SLinus Torvalds * We will call the ->create function, that possibly is in a loadable 11571da177e4SLinus Torvalds * module, so we have to bump that loadable module refcnt first. 11581da177e4SLinus Torvalds */ 11591da177e4SLinus Torvalds err = -EAFNOSUPPORT; 11601da177e4SLinus Torvalds if (!try_module_get(net_families[family]->owner)) 11611da177e4SLinus Torvalds goto out_release; 11621da177e4SLinus Torvalds 1163a79af59eSFrank Filz if ((err = net_families[family]->create(sock, protocol)) < 0) { 1164a79af59eSFrank Filz sock->ops = NULL; 11651da177e4SLinus Torvalds goto out_module_put; 1166a79af59eSFrank Filz } 1167a79af59eSFrank Filz 11681da177e4SLinus Torvalds /* 11691da177e4SLinus Torvalds * Now to bump the refcnt of the [loadable] module that owns this 11701da177e4SLinus Torvalds * socket at sock_release time we decrement its refcnt. 11711da177e4SLinus Torvalds */ 11721da177e4SLinus Torvalds if (!try_module_get(sock->ops->owner)) { 11731da177e4SLinus Torvalds sock->ops = NULL; 11741da177e4SLinus Torvalds goto out_module_put; 11751da177e4SLinus Torvalds } 11761da177e4SLinus Torvalds /* 11771da177e4SLinus Torvalds * Now that we're done with the ->create function, the [loadable] 11781da177e4SLinus Torvalds * module can have its refcnt decremented 11791da177e4SLinus Torvalds */ 11801da177e4SLinus Torvalds module_put(net_families[family]->owner); 11811da177e4SLinus Torvalds *res = sock; 11821da177e4SLinus Torvalds security_socket_post_create(sock, family, type, protocol, kern); 11831da177e4SLinus Torvalds 11841da177e4SLinus Torvalds out: 11851da177e4SLinus Torvalds net_family_read_unlock(); 11861da177e4SLinus Torvalds return err; 11871da177e4SLinus Torvalds out_module_put: 11881da177e4SLinus Torvalds module_put(net_families[family]->owner); 11891da177e4SLinus Torvalds out_release: 11901da177e4SLinus Torvalds sock_release(sock); 11911da177e4SLinus Torvalds goto out; 11921da177e4SLinus Torvalds } 11931da177e4SLinus Torvalds 11941da177e4SLinus Torvalds int sock_create(int family, int type, int protocol, struct socket **res) 11951da177e4SLinus Torvalds { 11961da177e4SLinus Torvalds return __sock_create(family, type, protocol, res, 0); 11971da177e4SLinus Torvalds } 11981da177e4SLinus Torvalds 11991da177e4SLinus Torvalds int sock_create_kern(int family, int type, int protocol, struct socket **res) 12001da177e4SLinus Torvalds { 12011da177e4SLinus Torvalds return __sock_create(family, type, protocol, res, 1); 12021da177e4SLinus Torvalds } 12031da177e4SLinus Torvalds 12041da177e4SLinus Torvalds asmlinkage long sys_socket(int family, int type, int protocol) 12051da177e4SLinus Torvalds { 12061da177e4SLinus Torvalds int retval; 12071da177e4SLinus Torvalds struct socket *sock; 12081da177e4SLinus Torvalds 12091da177e4SLinus Torvalds retval = sock_create(family, type, protocol, &sock); 12101da177e4SLinus Torvalds if (retval < 0) 12111da177e4SLinus Torvalds goto out; 12121da177e4SLinus Torvalds 12131da177e4SLinus Torvalds retval = sock_map_fd(sock); 12141da177e4SLinus Torvalds if (retval < 0) 12151da177e4SLinus Torvalds goto out_release; 12161da177e4SLinus Torvalds 12171da177e4SLinus Torvalds out: 12181da177e4SLinus Torvalds /* It may be already another descriptor 8) Not kernel problem. */ 12191da177e4SLinus Torvalds return retval; 12201da177e4SLinus Torvalds 12211da177e4SLinus Torvalds out_release: 12221da177e4SLinus Torvalds sock_release(sock); 12231da177e4SLinus Torvalds return retval; 12241da177e4SLinus Torvalds } 12251da177e4SLinus Torvalds 12261da177e4SLinus Torvalds /* 12271da177e4SLinus Torvalds * Create a pair of connected sockets. 12281da177e4SLinus Torvalds */ 12291da177e4SLinus Torvalds 12301da177e4SLinus Torvalds asmlinkage long sys_socketpair(int family, int type, int protocol, int __user *usockvec) 12311da177e4SLinus Torvalds { 12321da177e4SLinus Torvalds struct socket *sock1, *sock2; 12331da177e4SLinus Torvalds int fd1, fd2, err; 12341da177e4SLinus Torvalds 12351da177e4SLinus Torvalds /* 12361da177e4SLinus Torvalds * Obtain the first socket and check if the underlying protocol 12371da177e4SLinus Torvalds * supports the socketpair call. 12381da177e4SLinus Torvalds */ 12391da177e4SLinus Torvalds 12401da177e4SLinus Torvalds err = sock_create(family, type, protocol, &sock1); 12411da177e4SLinus Torvalds if (err < 0) 12421da177e4SLinus Torvalds goto out; 12431da177e4SLinus Torvalds 12441da177e4SLinus Torvalds err = sock_create(family, type, protocol, &sock2); 12451da177e4SLinus Torvalds if (err < 0) 12461da177e4SLinus Torvalds goto out_release_1; 12471da177e4SLinus Torvalds 12481da177e4SLinus Torvalds err = sock1->ops->socketpair(sock1, sock2); 12491da177e4SLinus Torvalds if (err < 0) 12501da177e4SLinus Torvalds goto out_release_both; 12511da177e4SLinus Torvalds 12521da177e4SLinus Torvalds fd1 = fd2 = -1; 12531da177e4SLinus Torvalds 12541da177e4SLinus Torvalds err = sock_map_fd(sock1); 12551da177e4SLinus Torvalds if (err < 0) 12561da177e4SLinus Torvalds goto out_release_both; 12571da177e4SLinus Torvalds fd1 = err; 12581da177e4SLinus Torvalds 12591da177e4SLinus Torvalds err = sock_map_fd(sock2); 12601da177e4SLinus Torvalds if (err < 0) 12611da177e4SLinus Torvalds goto out_close_1; 12621da177e4SLinus Torvalds fd2 = err; 12631da177e4SLinus Torvalds 12641da177e4SLinus Torvalds /* fd1 and fd2 may be already another descriptors. 12651da177e4SLinus Torvalds * Not kernel problem. 12661da177e4SLinus Torvalds */ 12671da177e4SLinus Torvalds 12681da177e4SLinus Torvalds err = put_user(fd1, &usockvec[0]); 12691da177e4SLinus Torvalds if (!err) 12701da177e4SLinus Torvalds err = put_user(fd2, &usockvec[1]); 12711da177e4SLinus Torvalds if (!err) 12721da177e4SLinus Torvalds return 0; 12731da177e4SLinus Torvalds 12741da177e4SLinus Torvalds sys_close(fd2); 12751da177e4SLinus Torvalds sys_close(fd1); 12761da177e4SLinus Torvalds return err; 12771da177e4SLinus Torvalds 12781da177e4SLinus Torvalds out_close_1: 12791da177e4SLinus Torvalds sock_release(sock2); 12801da177e4SLinus Torvalds sys_close(fd1); 12811da177e4SLinus Torvalds return err; 12821da177e4SLinus Torvalds 12831da177e4SLinus Torvalds out_release_both: 12841da177e4SLinus Torvalds sock_release(sock2); 12851da177e4SLinus Torvalds out_release_1: 12861da177e4SLinus Torvalds sock_release(sock1); 12871da177e4SLinus Torvalds out: 12881da177e4SLinus Torvalds return err; 12891da177e4SLinus Torvalds } 12901da177e4SLinus Torvalds 12911da177e4SLinus Torvalds 12921da177e4SLinus Torvalds /* 12931da177e4SLinus Torvalds * Bind a name to a socket. Nothing much to do here since it's 12941da177e4SLinus Torvalds * the protocol's responsibility to handle the local address. 12951da177e4SLinus Torvalds * 12961da177e4SLinus Torvalds * We move the socket address to kernel space before we call 12971da177e4SLinus Torvalds * the protocol layer (having also checked the address is ok). 12981da177e4SLinus Torvalds */ 12991da177e4SLinus Torvalds 13001da177e4SLinus Torvalds asmlinkage long sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) 13011da177e4SLinus Torvalds { 13021da177e4SLinus Torvalds struct socket *sock; 13031da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 13041da177e4SLinus Torvalds int err; 13051da177e4SLinus Torvalds 13061da177e4SLinus Torvalds if((sock = sockfd_lookup(fd,&err))!=NULL) 13071da177e4SLinus Torvalds { 13081da177e4SLinus Torvalds if((err=move_addr_to_kernel(umyaddr,addrlen,address))>=0) { 13091da177e4SLinus Torvalds err = security_socket_bind(sock, (struct sockaddr *)address, addrlen); 13101da177e4SLinus Torvalds if (err) { 13111da177e4SLinus Torvalds sockfd_put(sock); 13121da177e4SLinus Torvalds return err; 13131da177e4SLinus Torvalds } 13141da177e4SLinus Torvalds err = sock->ops->bind(sock, (struct sockaddr *)address, addrlen); 13151da177e4SLinus Torvalds } 13161da177e4SLinus Torvalds sockfd_put(sock); 13171da177e4SLinus Torvalds } 13181da177e4SLinus Torvalds return err; 13191da177e4SLinus Torvalds } 13201da177e4SLinus Torvalds 13211da177e4SLinus Torvalds 13221da177e4SLinus Torvalds /* 13231da177e4SLinus Torvalds * Perform a listen. Basically, we allow the protocol to do anything 13241da177e4SLinus Torvalds * necessary for a listen, and if that works, we mark the socket as 13251da177e4SLinus Torvalds * ready for listening. 13261da177e4SLinus Torvalds */ 13271da177e4SLinus Torvalds 13281da177e4SLinus Torvalds int sysctl_somaxconn = SOMAXCONN; 13291da177e4SLinus Torvalds 13301da177e4SLinus Torvalds asmlinkage long sys_listen(int fd, int backlog) 13311da177e4SLinus Torvalds { 13321da177e4SLinus Torvalds struct socket *sock; 13331da177e4SLinus Torvalds int err; 13341da177e4SLinus Torvalds 13351da177e4SLinus Torvalds if ((sock = sockfd_lookup(fd, &err)) != NULL) { 13361da177e4SLinus Torvalds if ((unsigned) backlog > sysctl_somaxconn) 13371da177e4SLinus Torvalds backlog = sysctl_somaxconn; 13381da177e4SLinus Torvalds 13391da177e4SLinus Torvalds err = security_socket_listen(sock, backlog); 13401da177e4SLinus Torvalds if (err) { 13411da177e4SLinus Torvalds sockfd_put(sock); 13421da177e4SLinus Torvalds return err; 13431da177e4SLinus Torvalds } 13441da177e4SLinus Torvalds 13451da177e4SLinus Torvalds err=sock->ops->listen(sock, backlog); 13461da177e4SLinus Torvalds sockfd_put(sock); 13471da177e4SLinus Torvalds } 13481da177e4SLinus Torvalds return err; 13491da177e4SLinus Torvalds } 13501da177e4SLinus Torvalds 13511da177e4SLinus Torvalds 13521da177e4SLinus Torvalds /* 13531da177e4SLinus Torvalds * For accept, we attempt to create a new socket, set up the link 13541da177e4SLinus Torvalds * with the client, wake up the client, then return the new 13551da177e4SLinus Torvalds * connected fd. We collect the address of the connector in kernel 13561da177e4SLinus Torvalds * space and move it to user at the very end. This is unclean because 13571da177e4SLinus Torvalds * we open the socket then return an error. 13581da177e4SLinus Torvalds * 13591da177e4SLinus Torvalds * 1003.1g adds the ability to recvmsg() to query connection pending 13601da177e4SLinus Torvalds * status to recvmsg. We need to add that support in a way thats 13611da177e4SLinus Torvalds * clean when we restucture accept also. 13621da177e4SLinus Torvalds */ 13631da177e4SLinus Torvalds 13641da177e4SLinus Torvalds asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr, int __user *upeer_addrlen) 13651da177e4SLinus Torvalds { 13661da177e4SLinus Torvalds struct socket *sock, *newsock; 1367*39d8c1b6SDavid S. Miller struct file *newfile; 1368*39d8c1b6SDavid S. Miller int err, len, newfd; 13691da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 13701da177e4SLinus Torvalds 13711da177e4SLinus Torvalds sock = sockfd_lookup(fd, &err); 13721da177e4SLinus Torvalds if (!sock) 13731da177e4SLinus Torvalds goto out; 13741da177e4SLinus Torvalds 13751da177e4SLinus Torvalds err = -ENFILE; 13761da177e4SLinus Torvalds if (!(newsock = sock_alloc())) 13771da177e4SLinus Torvalds goto out_put; 13781da177e4SLinus Torvalds 13791da177e4SLinus Torvalds newsock->type = sock->type; 13801da177e4SLinus Torvalds newsock->ops = sock->ops; 13811da177e4SLinus Torvalds 13821da177e4SLinus Torvalds /* 13831da177e4SLinus Torvalds * We don't need try_module_get here, as the listening socket (sock) 13841da177e4SLinus Torvalds * has the protocol module (sock->ops->owner) held. 13851da177e4SLinus Torvalds */ 13861da177e4SLinus Torvalds __module_get(newsock->ops->owner); 13871da177e4SLinus Torvalds 1388*39d8c1b6SDavid S. Miller newfd = sock_alloc_fd(&newfile); 1389*39d8c1b6SDavid S. Miller if (unlikely(newfd < 0)) { 1390*39d8c1b6SDavid S. Miller err = newfd; 1391*39d8c1b6SDavid S. Miller goto out_release; 1392*39d8c1b6SDavid S. Miller } 1393*39d8c1b6SDavid S. Miller 1394*39d8c1b6SDavid S. Miller err = sock_attach_fd(newsock, newfile); 1395*39d8c1b6SDavid S. Miller if (err < 0) 1396*39d8c1b6SDavid S. Miller goto out_fd; 1397*39d8c1b6SDavid S. Miller 1398a79af59eSFrank Filz err = security_socket_accept(sock, newsock); 1399a79af59eSFrank Filz if (err) 1400*39d8c1b6SDavid S. Miller goto out_fd; 1401a79af59eSFrank Filz 14021da177e4SLinus Torvalds err = sock->ops->accept(sock, newsock, sock->file->f_flags); 14031da177e4SLinus Torvalds if (err < 0) 1404*39d8c1b6SDavid S. Miller goto out_fd; 14051da177e4SLinus Torvalds 14061da177e4SLinus Torvalds if (upeer_sockaddr) { 14071da177e4SLinus Torvalds if(newsock->ops->getname(newsock, (struct sockaddr *)address, &len, 2)<0) { 14081da177e4SLinus Torvalds err = -ECONNABORTED; 1409*39d8c1b6SDavid S. Miller goto out_fd; 14101da177e4SLinus Torvalds } 14111da177e4SLinus Torvalds err = move_addr_to_user(address, len, upeer_sockaddr, upeer_addrlen); 14121da177e4SLinus Torvalds if (err < 0) 1413*39d8c1b6SDavid S. Miller goto out_fd; 14141da177e4SLinus Torvalds } 14151da177e4SLinus Torvalds 14161da177e4SLinus Torvalds /* File flags are not inherited via accept() unlike another OSes. */ 14171da177e4SLinus Torvalds 1418*39d8c1b6SDavid S. Miller fd_install(newfd, newfile); 1419*39d8c1b6SDavid S. Miller err = newfd; 14201da177e4SLinus Torvalds 14211da177e4SLinus Torvalds security_socket_post_accept(sock, newsock); 14221da177e4SLinus Torvalds 14231da177e4SLinus Torvalds out_put: 14241da177e4SLinus Torvalds sockfd_put(sock); 14251da177e4SLinus Torvalds out: 14261da177e4SLinus Torvalds return err; 1427*39d8c1b6SDavid S. Miller out_fd: 1428*39d8c1b6SDavid S. Miller put_filp(newfile); 1429*39d8c1b6SDavid S. Miller put_unused_fd(newfd); 14301da177e4SLinus Torvalds out_release: 14311da177e4SLinus Torvalds sock_release(newsock); 14321da177e4SLinus Torvalds goto out_put; 14331da177e4SLinus Torvalds } 14341da177e4SLinus Torvalds 14351da177e4SLinus Torvalds 14361da177e4SLinus Torvalds /* 14371da177e4SLinus Torvalds * Attempt to connect to a socket with the server address. The address 14381da177e4SLinus Torvalds * is in user space so we verify it is OK and move it to kernel space. 14391da177e4SLinus Torvalds * 14401da177e4SLinus Torvalds * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to 14411da177e4SLinus Torvalds * break bindings 14421da177e4SLinus Torvalds * 14431da177e4SLinus Torvalds * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and 14441da177e4SLinus Torvalds * other SEQPACKET protocols that take time to connect() as it doesn't 14451da177e4SLinus Torvalds * include the -EINPROGRESS status for such sockets. 14461da177e4SLinus Torvalds */ 14471da177e4SLinus Torvalds 14481da177e4SLinus Torvalds asmlinkage long sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen) 14491da177e4SLinus Torvalds { 14501da177e4SLinus Torvalds struct socket *sock; 14511da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 14521da177e4SLinus Torvalds int err; 14531da177e4SLinus Torvalds 14541da177e4SLinus Torvalds sock = sockfd_lookup(fd, &err); 14551da177e4SLinus Torvalds if (!sock) 14561da177e4SLinus Torvalds goto out; 14571da177e4SLinus Torvalds err = move_addr_to_kernel(uservaddr, addrlen, address); 14581da177e4SLinus Torvalds if (err < 0) 14591da177e4SLinus Torvalds goto out_put; 14601da177e4SLinus Torvalds 14611da177e4SLinus Torvalds err = security_socket_connect(sock, (struct sockaddr *)address, addrlen); 14621da177e4SLinus Torvalds if (err) 14631da177e4SLinus Torvalds goto out_put; 14641da177e4SLinus Torvalds 14651da177e4SLinus Torvalds err = sock->ops->connect(sock, (struct sockaddr *) address, addrlen, 14661da177e4SLinus Torvalds sock->file->f_flags); 14671da177e4SLinus Torvalds out_put: 14681da177e4SLinus Torvalds sockfd_put(sock); 14691da177e4SLinus Torvalds out: 14701da177e4SLinus Torvalds return err; 14711da177e4SLinus Torvalds } 14721da177e4SLinus Torvalds 14731da177e4SLinus Torvalds /* 14741da177e4SLinus Torvalds * Get the local address ('name') of a socket object. Move the obtained 14751da177e4SLinus Torvalds * name to user space. 14761da177e4SLinus Torvalds */ 14771da177e4SLinus Torvalds 14781da177e4SLinus Torvalds asmlinkage long sys_getsockname(int fd, struct sockaddr __user *usockaddr, int __user *usockaddr_len) 14791da177e4SLinus Torvalds { 14801da177e4SLinus Torvalds struct socket *sock; 14811da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 14821da177e4SLinus Torvalds int len, err; 14831da177e4SLinus Torvalds 14841da177e4SLinus Torvalds sock = sockfd_lookup(fd, &err); 14851da177e4SLinus Torvalds if (!sock) 14861da177e4SLinus Torvalds goto out; 14871da177e4SLinus Torvalds 14881da177e4SLinus Torvalds err = security_socket_getsockname(sock); 14891da177e4SLinus Torvalds if (err) 14901da177e4SLinus Torvalds goto out_put; 14911da177e4SLinus Torvalds 14921da177e4SLinus Torvalds err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 0); 14931da177e4SLinus Torvalds if (err) 14941da177e4SLinus Torvalds goto out_put; 14951da177e4SLinus Torvalds err = move_addr_to_user(address, len, usockaddr, usockaddr_len); 14961da177e4SLinus Torvalds 14971da177e4SLinus Torvalds out_put: 14981da177e4SLinus Torvalds sockfd_put(sock); 14991da177e4SLinus Torvalds out: 15001da177e4SLinus Torvalds return err; 15011da177e4SLinus Torvalds } 15021da177e4SLinus Torvalds 15031da177e4SLinus Torvalds /* 15041da177e4SLinus Torvalds * Get the remote address ('name') of a socket object. Move the obtained 15051da177e4SLinus Torvalds * name to user space. 15061da177e4SLinus Torvalds */ 15071da177e4SLinus Torvalds 15081da177e4SLinus Torvalds asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr, int __user *usockaddr_len) 15091da177e4SLinus Torvalds { 15101da177e4SLinus Torvalds struct socket *sock; 15111da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 15121da177e4SLinus Torvalds int len, err; 15131da177e4SLinus Torvalds 15141da177e4SLinus Torvalds if ((sock = sockfd_lookup(fd, &err))!=NULL) 15151da177e4SLinus Torvalds { 15161da177e4SLinus Torvalds err = security_socket_getpeername(sock); 15171da177e4SLinus Torvalds if (err) { 15181da177e4SLinus Torvalds sockfd_put(sock); 15191da177e4SLinus Torvalds return err; 15201da177e4SLinus Torvalds } 15211da177e4SLinus Torvalds 15221da177e4SLinus Torvalds err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 1); 15231da177e4SLinus Torvalds if (!err) 15241da177e4SLinus Torvalds err=move_addr_to_user(address,len, usockaddr, usockaddr_len); 15251da177e4SLinus Torvalds sockfd_put(sock); 15261da177e4SLinus Torvalds } 15271da177e4SLinus Torvalds return err; 15281da177e4SLinus Torvalds } 15291da177e4SLinus Torvalds 15301da177e4SLinus Torvalds /* 15311da177e4SLinus Torvalds * Send a datagram to a given address. We move the address into kernel 15321da177e4SLinus Torvalds * space and check the user space data area is readable before invoking 15331da177e4SLinus Torvalds * the protocol. 15341da177e4SLinus Torvalds */ 15351da177e4SLinus Torvalds 15361da177e4SLinus Torvalds asmlinkage long sys_sendto(int fd, void __user * buff, size_t len, unsigned flags, 15371da177e4SLinus Torvalds struct sockaddr __user *addr, int addr_len) 15381da177e4SLinus Torvalds { 15391da177e4SLinus Torvalds struct socket *sock; 15401da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 15411da177e4SLinus Torvalds int err; 15421da177e4SLinus Torvalds struct msghdr msg; 15431da177e4SLinus Torvalds struct iovec iov; 15441da177e4SLinus Torvalds 15451da177e4SLinus Torvalds sock = sockfd_lookup(fd, &err); 15461da177e4SLinus Torvalds if (!sock) 15471da177e4SLinus Torvalds goto out; 15481da177e4SLinus Torvalds iov.iov_base=buff; 15491da177e4SLinus Torvalds iov.iov_len=len; 15501da177e4SLinus Torvalds msg.msg_name=NULL; 15511da177e4SLinus Torvalds msg.msg_iov=&iov; 15521da177e4SLinus Torvalds msg.msg_iovlen=1; 15531da177e4SLinus Torvalds msg.msg_control=NULL; 15541da177e4SLinus Torvalds msg.msg_controllen=0; 15551da177e4SLinus Torvalds msg.msg_namelen=0; 15561da177e4SLinus Torvalds if(addr) 15571da177e4SLinus Torvalds { 15581da177e4SLinus Torvalds err = move_addr_to_kernel(addr, addr_len, address); 15591da177e4SLinus Torvalds if (err < 0) 15601da177e4SLinus Torvalds goto out_put; 15611da177e4SLinus Torvalds msg.msg_name=address; 15621da177e4SLinus Torvalds msg.msg_namelen=addr_len; 15631da177e4SLinus Torvalds } 15641da177e4SLinus Torvalds if (sock->file->f_flags & O_NONBLOCK) 15651da177e4SLinus Torvalds flags |= MSG_DONTWAIT; 15661da177e4SLinus Torvalds msg.msg_flags = flags; 15671da177e4SLinus Torvalds err = sock_sendmsg(sock, &msg, len); 15681da177e4SLinus Torvalds 15691da177e4SLinus Torvalds out_put: 15701da177e4SLinus Torvalds sockfd_put(sock); 15711da177e4SLinus Torvalds out: 15721da177e4SLinus Torvalds return err; 15731da177e4SLinus Torvalds } 15741da177e4SLinus Torvalds 15751da177e4SLinus Torvalds /* 15761da177e4SLinus Torvalds * Send a datagram down a socket. 15771da177e4SLinus Torvalds */ 15781da177e4SLinus Torvalds 15791da177e4SLinus Torvalds asmlinkage long sys_send(int fd, void __user * buff, size_t len, unsigned flags) 15801da177e4SLinus Torvalds { 15811da177e4SLinus Torvalds return sys_sendto(fd, buff, len, flags, NULL, 0); 15821da177e4SLinus Torvalds } 15831da177e4SLinus Torvalds 15841da177e4SLinus Torvalds /* 15851da177e4SLinus Torvalds * Receive a frame from the socket and optionally record the address of the 15861da177e4SLinus Torvalds * sender. We verify the buffers are writable and if needed move the 15871da177e4SLinus Torvalds * sender address from kernel to user space. 15881da177e4SLinus Torvalds */ 15891da177e4SLinus Torvalds 15901da177e4SLinus Torvalds asmlinkage long sys_recvfrom(int fd, void __user * ubuf, size_t size, unsigned flags, 15911da177e4SLinus Torvalds struct sockaddr __user *addr, int __user *addr_len) 15921da177e4SLinus Torvalds { 15931da177e4SLinus Torvalds struct socket *sock; 15941da177e4SLinus Torvalds struct iovec iov; 15951da177e4SLinus Torvalds struct msghdr msg; 15961da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 15971da177e4SLinus Torvalds int err,err2; 15981da177e4SLinus Torvalds 15991da177e4SLinus Torvalds sock = sockfd_lookup(fd, &err); 16001da177e4SLinus Torvalds if (!sock) 16011da177e4SLinus Torvalds goto out; 16021da177e4SLinus Torvalds 16031da177e4SLinus Torvalds msg.msg_control=NULL; 16041da177e4SLinus Torvalds msg.msg_controllen=0; 16051da177e4SLinus Torvalds msg.msg_iovlen=1; 16061da177e4SLinus Torvalds msg.msg_iov=&iov; 16071da177e4SLinus Torvalds iov.iov_len=size; 16081da177e4SLinus Torvalds iov.iov_base=ubuf; 16091da177e4SLinus Torvalds msg.msg_name=address; 16101da177e4SLinus Torvalds msg.msg_namelen=MAX_SOCK_ADDR; 16111da177e4SLinus Torvalds if (sock->file->f_flags & O_NONBLOCK) 16121da177e4SLinus Torvalds flags |= MSG_DONTWAIT; 16131da177e4SLinus Torvalds err=sock_recvmsg(sock, &msg, size, flags); 16141da177e4SLinus Torvalds 16151da177e4SLinus Torvalds if(err >= 0 && addr != NULL) 16161da177e4SLinus Torvalds { 16171da177e4SLinus Torvalds err2=move_addr_to_user(address, msg.msg_namelen, addr, addr_len); 16181da177e4SLinus Torvalds if(err2<0) 16191da177e4SLinus Torvalds err=err2; 16201da177e4SLinus Torvalds } 16211da177e4SLinus Torvalds sockfd_put(sock); 16221da177e4SLinus Torvalds out: 16231da177e4SLinus Torvalds return err; 16241da177e4SLinus Torvalds } 16251da177e4SLinus Torvalds 16261da177e4SLinus Torvalds /* 16271da177e4SLinus Torvalds * Receive a datagram from a socket. 16281da177e4SLinus Torvalds */ 16291da177e4SLinus Torvalds 16301da177e4SLinus Torvalds asmlinkage long sys_recv(int fd, void __user * ubuf, size_t size, unsigned flags) 16311da177e4SLinus Torvalds { 16321da177e4SLinus Torvalds return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); 16331da177e4SLinus Torvalds } 16341da177e4SLinus Torvalds 16351da177e4SLinus Torvalds /* 16361da177e4SLinus Torvalds * Set a socket option. Because we don't know the option lengths we have 16371da177e4SLinus Torvalds * to pass the user mode parameter for the protocols to sort out. 16381da177e4SLinus Torvalds */ 16391da177e4SLinus Torvalds 16401da177e4SLinus Torvalds asmlinkage long sys_setsockopt(int fd, int level, int optname, char __user *optval, int optlen) 16411da177e4SLinus Torvalds { 16421da177e4SLinus Torvalds int err; 16431da177e4SLinus Torvalds struct socket *sock; 16441da177e4SLinus Torvalds 16451da177e4SLinus Torvalds if (optlen < 0) 16461da177e4SLinus Torvalds return -EINVAL; 16471da177e4SLinus Torvalds 16481da177e4SLinus Torvalds if ((sock = sockfd_lookup(fd, &err))!=NULL) 16491da177e4SLinus Torvalds { 16501da177e4SLinus Torvalds err = security_socket_setsockopt(sock,level,optname); 16511da177e4SLinus Torvalds if (err) { 16521da177e4SLinus Torvalds sockfd_put(sock); 16531da177e4SLinus Torvalds return err; 16541da177e4SLinus Torvalds } 16551da177e4SLinus Torvalds 16561da177e4SLinus Torvalds if (level == SOL_SOCKET) 16571da177e4SLinus Torvalds err=sock_setsockopt(sock,level,optname,optval,optlen); 16581da177e4SLinus Torvalds else 16591da177e4SLinus Torvalds err=sock->ops->setsockopt(sock, level, optname, optval, optlen); 16601da177e4SLinus Torvalds sockfd_put(sock); 16611da177e4SLinus Torvalds } 16621da177e4SLinus Torvalds return err; 16631da177e4SLinus Torvalds } 16641da177e4SLinus Torvalds 16651da177e4SLinus Torvalds /* 16661da177e4SLinus Torvalds * Get a socket option. Because we don't know the option lengths we have 16671da177e4SLinus Torvalds * to pass a user mode parameter for the protocols to sort out. 16681da177e4SLinus Torvalds */ 16691da177e4SLinus Torvalds 16701da177e4SLinus Torvalds asmlinkage long sys_getsockopt(int fd, int level, int optname, char __user *optval, int __user *optlen) 16711da177e4SLinus Torvalds { 16721da177e4SLinus Torvalds int err; 16731da177e4SLinus Torvalds struct socket *sock; 16741da177e4SLinus Torvalds 16751da177e4SLinus Torvalds if ((sock = sockfd_lookup(fd, &err))!=NULL) 16761da177e4SLinus Torvalds { 16771da177e4SLinus Torvalds err = security_socket_getsockopt(sock, level, 16781da177e4SLinus Torvalds optname); 16791da177e4SLinus Torvalds if (err) { 16801da177e4SLinus Torvalds sockfd_put(sock); 16811da177e4SLinus Torvalds return err; 16821da177e4SLinus Torvalds } 16831da177e4SLinus Torvalds 16841da177e4SLinus Torvalds if (level == SOL_SOCKET) 16851da177e4SLinus Torvalds err=sock_getsockopt(sock,level,optname,optval,optlen); 16861da177e4SLinus Torvalds else 16871da177e4SLinus Torvalds err=sock->ops->getsockopt(sock, level, optname, optval, optlen); 16881da177e4SLinus Torvalds sockfd_put(sock); 16891da177e4SLinus Torvalds } 16901da177e4SLinus Torvalds return err; 16911da177e4SLinus Torvalds } 16921da177e4SLinus Torvalds 16931da177e4SLinus Torvalds 16941da177e4SLinus Torvalds /* 16951da177e4SLinus Torvalds * Shutdown a socket. 16961da177e4SLinus Torvalds */ 16971da177e4SLinus Torvalds 16981da177e4SLinus Torvalds asmlinkage long sys_shutdown(int fd, int how) 16991da177e4SLinus Torvalds { 17001da177e4SLinus Torvalds int err; 17011da177e4SLinus Torvalds struct socket *sock; 17021da177e4SLinus Torvalds 17031da177e4SLinus Torvalds if ((sock = sockfd_lookup(fd, &err))!=NULL) 17041da177e4SLinus Torvalds { 17051da177e4SLinus Torvalds err = security_socket_shutdown(sock, how); 17061da177e4SLinus Torvalds if (err) { 17071da177e4SLinus Torvalds sockfd_put(sock); 17081da177e4SLinus Torvalds return err; 17091da177e4SLinus Torvalds } 17101da177e4SLinus Torvalds 17111da177e4SLinus Torvalds err=sock->ops->shutdown(sock, how); 17121da177e4SLinus Torvalds sockfd_put(sock); 17131da177e4SLinus Torvalds } 17141da177e4SLinus Torvalds return err; 17151da177e4SLinus Torvalds } 17161da177e4SLinus Torvalds 17171da177e4SLinus Torvalds /* A couple of helpful macros for getting the address of the 32/64 bit 17181da177e4SLinus Torvalds * fields which are the same type (int / unsigned) on our platforms. 17191da177e4SLinus Torvalds */ 17201da177e4SLinus Torvalds #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) 17211da177e4SLinus Torvalds #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) 17221da177e4SLinus Torvalds #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) 17231da177e4SLinus Torvalds 17241da177e4SLinus Torvalds 17251da177e4SLinus Torvalds /* 17261da177e4SLinus Torvalds * BSD sendmsg interface 17271da177e4SLinus Torvalds */ 17281da177e4SLinus Torvalds 17291da177e4SLinus Torvalds asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags) 17301da177e4SLinus Torvalds { 17311da177e4SLinus Torvalds struct compat_msghdr __user *msg_compat = (struct compat_msghdr __user *)msg; 17321da177e4SLinus Torvalds struct socket *sock; 17331da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 17341da177e4SLinus Torvalds struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; 1735b9d717a7SAlex Williamson unsigned char ctl[sizeof(struct cmsghdr) + 20] 1736b9d717a7SAlex Williamson __attribute__ ((aligned (sizeof(__kernel_size_t)))); 1737b9d717a7SAlex Williamson /* 20 is size of ipv6_pktinfo */ 17381da177e4SLinus Torvalds unsigned char *ctl_buf = ctl; 17391da177e4SLinus Torvalds struct msghdr msg_sys; 17401da177e4SLinus Torvalds int err, ctl_len, iov_size, total_len; 17411da177e4SLinus Torvalds 17421da177e4SLinus Torvalds err = -EFAULT; 17431da177e4SLinus Torvalds if (MSG_CMSG_COMPAT & flags) { 17441da177e4SLinus Torvalds if (get_compat_msghdr(&msg_sys, msg_compat)) 17451da177e4SLinus Torvalds return -EFAULT; 17461da177e4SLinus Torvalds } else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) 17471da177e4SLinus Torvalds return -EFAULT; 17481da177e4SLinus Torvalds 17491da177e4SLinus Torvalds sock = sockfd_lookup(fd, &err); 17501da177e4SLinus Torvalds if (!sock) 17511da177e4SLinus Torvalds goto out; 17521da177e4SLinus Torvalds 17531da177e4SLinus Torvalds /* do not move before msg_sys is valid */ 17541da177e4SLinus Torvalds err = -EMSGSIZE; 17551da177e4SLinus Torvalds if (msg_sys.msg_iovlen > UIO_MAXIOV) 17561da177e4SLinus Torvalds goto out_put; 17571da177e4SLinus Torvalds 17581da177e4SLinus Torvalds /* Check whether to allocate the iovec area*/ 17591da177e4SLinus Torvalds err = -ENOMEM; 17601da177e4SLinus Torvalds iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); 17611da177e4SLinus Torvalds if (msg_sys.msg_iovlen > UIO_FASTIOV) { 17621da177e4SLinus Torvalds iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); 17631da177e4SLinus Torvalds if (!iov) 17641da177e4SLinus Torvalds goto out_put; 17651da177e4SLinus Torvalds } 17661da177e4SLinus Torvalds 17671da177e4SLinus Torvalds /* This will also move the address data into kernel space */ 17681da177e4SLinus Torvalds if (MSG_CMSG_COMPAT & flags) { 17691da177e4SLinus Torvalds err = verify_compat_iovec(&msg_sys, iov, address, VERIFY_READ); 17701da177e4SLinus Torvalds } else 17711da177e4SLinus Torvalds err = verify_iovec(&msg_sys, iov, address, VERIFY_READ); 17721da177e4SLinus Torvalds if (err < 0) 17731da177e4SLinus Torvalds goto out_freeiov; 17741da177e4SLinus Torvalds total_len = err; 17751da177e4SLinus Torvalds 17761da177e4SLinus Torvalds err = -ENOBUFS; 17771da177e4SLinus Torvalds 17781da177e4SLinus Torvalds if (msg_sys.msg_controllen > INT_MAX) 17791da177e4SLinus Torvalds goto out_freeiov; 17801da177e4SLinus Torvalds ctl_len = msg_sys.msg_controllen; 17811da177e4SLinus Torvalds if ((MSG_CMSG_COMPAT & flags) && ctl_len) { 17828920e8f9SAl Viro err = cmsghdr_from_user_compat_to_kern(&msg_sys, sock->sk, ctl, sizeof(ctl)); 17831da177e4SLinus Torvalds if (err) 17841da177e4SLinus Torvalds goto out_freeiov; 17851da177e4SLinus Torvalds ctl_buf = msg_sys.msg_control; 17868920e8f9SAl Viro ctl_len = msg_sys.msg_controllen; 17871da177e4SLinus Torvalds } else if (ctl_len) { 17881da177e4SLinus Torvalds if (ctl_len > sizeof(ctl)) 17891da177e4SLinus Torvalds { 17901da177e4SLinus Torvalds ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); 17911da177e4SLinus Torvalds if (ctl_buf == NULL) 17921da177e4SLinus Torvalds goto out_freeiov; 17931da177e4SLinus Torvalds } 17941da177e4SLinus Torvalds err = -EFAULT; 17951da177e4SLinus Torvalds /* 17961da177e4SLinus Torvalds * Careful! Before this, msg_sys.msg_control contains a user pointer. 17971da177e4SLinus Torvalds * Afterwards, it will be a kernel pointer. Thus the compiler-assisted 17981da177e4SLinus Torvalds * checking falls down on this. 17991da177e4SLinus Torvalds */ 18001da177e4SLinus Torvalds if (copy_from_user(ctl_buf, (void __user *) msg_sys.msg_control, ctl_len)) 18011da177e4SLinus Torvalds goto out_freectl; 18021da177e4SLinus Torvalds msg_sys.msg_control = ctl_buf; 18031da177e4SLinus Torvalds } 18041da177e4SLinus Torvalds msg_sys.msg_flags = flags; 18051da177e4SLinus Torvalds 18061da177e4SLinus Torvalds if (sock->file->f_flags & O_NONBLOCK) 18071da177e4SLinus Torvalds msg_sys.msg_flags |= MSG_DONTWAIT; 18081da177e4SLinus Torvalds err = sock_sendmsg(sock, &msg_sys, total_len); 18091da177e4SLinus Torvalds 18101da177e4SLinus Torvalds out_freectl: 18111da177e4SLinus Torvalds if (ctl_buf != ctl) 18121da177e4SLinus Torvalds sock_kfree_s(sock->sk, ctl_buf, ctl_len); 18131da177e4SLinus Torvalds out_freeiov: 18141da177e4SLinus Torvalds if (iov != iovstack) 18151da177e4SLinus Torvalds sock_kfree_s(sock->sk, iov, iov_size); 18161da177e4SLinus Torvalds out_put: 18171da177e4SLinus Torvalds sockfd_put(sock); 18181da177e4SLinus Torvalds out: 18191da177e4SLinus Torvalds return err; 18201da177e4SLinus Torvalds } 18211da177e4SLinus Torvalds 18221da177e4SLinus Torvalds /* 18231da177e4SLinus Torvalds * BSD recvmsg interface 18241da177e4SLinus Torvalds */ 18251da177e4SLinus Torvalds 18261da177e4SLinus Torvalds asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg, unsigned int flags) 18271da177e4SLinus Torvalds { 18281da177e4SLinus Torvalds struct compat_msghdr __user *msg_compat = (struct compat_msghdr __user *)msg; 18291da177e4SLinus Torvalds struct socket *sock; 18301da177e4SLinus Torvalds struct iovec iovstack[UIO_FASTIOV]; 18311da177e4SLinus Torvalds struct iovec *iov=iovstack; 18321da177e4SLinus Torvalds struct msghdr msg_sys; 18331da177e4SLinus Torvalds unsigned long cmsg_ptr; 18341da177e4SLinus Torvalds int err, iov_size, total_len, len; 18351da177e4SLinus Torvalds 18361da177e4SLinus Torvalds /* kernel mode address */ 18371da177e4SLinus Torvalds char addr[MAX_SOCK_ADDR]; 18381da177e4SLinus Torvalds 18391da177e4SLinus Torvalds /* user mode address pointers */ 18401da177e4SLinus Torvalds struct sockaddr __user *uaddr; 18411da177e4SLinus Torvalds int __user *uaddr_len; 18421da177e4SLinus Torvalds 18431da177e4SLinus Torvalds if (MSG_CMSG_COMPAT & flags) { 18441da177e4SLinus Torvalds if (get_compat_msghdr(&msg_sys, msg_compat)) 18451da177e4SLinus Torvalds return -EFAULT; 18461da177e4SLinus Torvalds } else 18471da177e4SLinus Torvalds if (copy_from_user(&msg_sys,msg,sizeof(struct msghdr))) 18481da177e4SLinus Torvalds return -EFAULT; 18491da177e4SLinus Torvalds 18501da177e4SLinus Torvalds sock = sockfd_lookup(fd, &err); 18511da177e4SLinus Torvalds if (!sock) 18521da177e4SLinus Torvalds goto out; 18531da177e4SLinus Torvalds 18541da177e4SLinus Torvalds err = -EMSGSIZE; 18551da177e4SLinus Torvalds if (msg_sys.msg_iovlen > UIO_MAXIOV) 18561da177e4SLinus Torvalds goto out_put; 18571da177e4SLinus Torvalds 18581da177e4SLinus Torvalds /* Check whether to allocate the iovec area*/ 18591da177e4SLinus Torvalds err = -ENOMEM; 18601da177e4SLinus Torvalds iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); 18611da177e4SLinus Torvalds if (msg_sys.msg_iovlen > UIO_FASTIOV) { 18621da177e4SLinus Torvalds iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); 18631da177e4SLinus Torvalds if (!iov) 18641da177e4SLinus Torvalds goto out_put; 18651da177e4SLinus Torvalds } 18661da177e4SLinus Torvalds 18671da177e4SLinus Torvalds /* 18681da177e4SLinus Torvalds * Save the user-mode address (verify_iovec will change the 18691da177e4SLinus Torvalds * kernel msghdr to use the kernel address space) 18701da177e4SLinus Torvalds */ 18711da177e4SLinus Torvalds 18721da177e4SLinus Torvalds uaddr = (void __user *) msg_sys.msg_name; 18731da177e4SLinus Torvalds uaddr_len = COMPAT_NAMELEN(msg); 18741da177e4SLinus Torvalds if (MSG_CMSG_COMPAT & flags) { 18751da177e4SLinus Torvalds err = verify_compat_iovec(&msg_sys, iov, addr, VERIFY_WRITE); 18761da177e4SLinus Torvalds } else 18771da177e4SLinus Torvalds err = verify_iovec(&msg_sys, iov, addr, VERIFY_WRITE); 18781da177e4SLinus Torvalds if (err < 0) 18791da177e4SLinus Torvalds goto out_freeiov; 18801da177e4SLinus Torvalds total_len=err; 18811da177e4SLinus Torvalds 18821da177e4SLinus Torvalds cmsg_ptr = (unsigned long)msg_sys.msg_control; 18831da177e4SLinus Torvalds msg_sys.msg_flags = 0; 18841da177e4SLinus Torvalds if (MSG_CMSG_COMPAT & flags) 18851da177e4SLinus Torvalds msg_sys.msg_flags = MSG_CMSG_COMPAT; 18861da177e4SLinus Torvalds 18871da177e4SLinus Torvalds if (sock->file->f_flags & O_NONBLOCK) 18881da177e4SLinus Torvalds flags |= MSG_DONTWAIT; 18891da177e4SLinus Torvalds err = sock_recvmsg(sock, &msg_sys, total_len, flags); 18901da177e4SLinus Torvalds if (err < 0) 18911da177e4SLinus Torvalds goto out_freeiov; 18921da177e4SLinus Torvalds len = err; 18931da177e4SLinus Torvalds 18941da177e4SLinus Torvalds if (uaddr != NULL) { 18951da177e4SLinus Torvalds err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr, uaddr_len); 18961da177e4SLinus Torvalds if (err < 0) 18971da177e4SLinus Torvalds goto out_freeiov; 18981da177e4SLinus Torvalds } 189937f7f421SDavid S. Miller err = __put_user((msg_sys.msg_flags & ~MSG_CMSG_COMPAT), 190037f7f421SDavid S. Miller COMPAT_FLAGS(msg)); 19011da177e4SLinus Torvalds if (err) 19021da177e4SLinus Torvalds goto out_freeiov; 19031da177e4SLinus Torvalds if (MSG_CMSG_COMPAT & flags) 19041da177e4SLinus Torvalds err = __put_user((unsigned long)msg_sys.msg_control-cmsg_ptr, 19051da177e4SLinus Torvalds &msg_compat->msg_controllen); 19061da177e4SLinus Torvalds else 19071da177e4SLinus Torvalds err = __put_user((unsigned long)msg_sys.msg_control-cmsg_ptr, 19081da177e4SLinus Torvalds &msg->msg_controllen); 19091da177e4SLinus Torvalds if (err) 19101da177e4SLinus Torvalds goto out_freeiov; 19111da177e4SLinus Torvalds err = len; 19121da177e4SLinus Torvalds 19131da177e4SLinus Torvalds out_freeiov: 19141da177e4SLinus Torvalds if (iov != iovstack) 19151da177e4SLinus Torvalds sock_kfree_s(sock->sk, iov, iov_size); 19161da177e4SLinus Torvalds out_put: 19171da177e4SLinus Torvalds sockfd_put(sock); 19181da177e4SLinus Torvalds out: 19191da177e4SLinus Torvalds return err; 19201da177e4SLinus Torvalds } 19211da177e4SLinus Torvalds 19221da177e4SLinus Torvalds #ifdef __ARCH_WANT_SYS_SOCKETCALL 19231da177e4SLinus Torvalds 19241da177e4SLinus Torvalds /* Argument list sizes for sys_socketcall */ 19251da177e4SLinus Torvalds #define AL(x) ((x) * sizeof(unsigned long)) 19261da177e4SLinus Torvalds static unsigned char nargs[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3), 19271da177e4SLinus Torvalds AL(3),AL(3),AL(4),AL(4),AL(4),AL(6), 19281da177e4SLinus Torvalds AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)}; 19291da177e4SLinus Torvalds #undef AL 19301da177e4SLinus Torvalds 19311da177e4SLinus Torvalds /* 19321da177e4SLinus Torvalds * System call vectors. 19331da177e4SLinus Torvalds * 19341da177e4SLinus Torvalds * Argument checking cleaned up. Saved 20% in size. 19351da177e4SLinus Torvalds * This function doesn't need to set the kernel lock because 19361da177e4SLinus Torvalds * it is set by the callees. 19371da177e4SLinus Torvalds */ 19381da177e4SLinus Torvalds 19391da177e4SLinus Torvalds asmlinkage long sys_socketcall(int call, unsigned long __user *args) 19401da177e4SLinus Torvalds { 19411da177e4SLinus Torvalds unsigned long a[6]; 19421da177e4SLinus Torvalds unsigned long a0,a1; 19431da177e4SLinus Torvalds int err; 19441da177e4SLinus Torvalds 19451da177e4SLinus Torvalds if(call<1||call>SYS_RECVMSG) 19461da177e4SLinus Torvalds return -EINVAL; 19471da177e4SLinus Torvalds 19481da177e4SLinus Torvalds /* copy_from_user should be SMP safe. */ 19491da177e4SLinus Torvalds if (copy_from_user(a, args, nargs[call])) 19501da177e4SLinus Torvalds return -EFAULT; 19511da177e4SLinus Torvalds 19524bcff1b3SDavid Woodhouse err = audit_socketcall(nargs[call]/sizeof(unsigned long), a); 19533ec3b2fbSDavid Woodhouse if (err) 19543ec3b2fbSDavid Woodhouse return err; 19553ec3b2fbSDavid Woodhouse 19561da177e4SLinus Torvalds a0=a[0]; 19571da177e4SLinus Torvalds a1=a[1]; 19581da177e4SLinus Torvalds 19591da177e4SLinus Torvalds switch(call) 19601da177e4SLinus Torvalds { 19611da177e4SLinus Torvalds case SYS_SOCKET: 19621da177e4SLinus Torvalds err = sys_socket(a0,a1,a[2]); 19631da177e4SLinus Torvalds break; 19641da177e4SLinus Torvalds case SYS_BIND: 19651da177e4SLinus Torvalds err = sys_bind(a0,(struct sockaddr __user *)a1, a[2]); 19661da177e4SLinus Torvalds break; 19671da177e4SLinus Torvalds case SYS_CONNECT: 19681da177e4SLinus Torvalds err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); 19691da177e4SLinus Torvalds break; 19701da177e4SLinus Torvalds case SYS_LISTEN: 19711da177e4SLinus Torvalds err = sys_listen(a0,a1); 19721da177e4SLinus Torvalds break; 19731da177e4SLinus Torvalds case SYS_ACCEPT: 19741da177e4SLinus Torvalds err = sys_accept(a0,(struct sockaddr __user *)a1, (int __user *)a[2]); 19751da177e4SLinus Torvalds break; 19761da177e4SLinus Torvalds case SYS_GETSOCKNAME: 19771da177e4SLinus Torvalds err = sys_getsockname(a0,(struct sockaddr __user *)a1, (int __user *)a[2]); 19781da177e4SLinus Torvalds break; 19791da177e4SLinus Torvalds case SYS_GETPEERNAME: 19801da177e4SLinus Torvalds err = sys_getpeername(a0, (struct sockaddr __user *)a1, (int __user *)a[2]); 19811da177e4SLinus Torvalds break; 19821da177e4SLinus Torvalds case SYS_SOCKETPAIR: 19831da177e4SLinus Torvalds err = sys_socketpair(a0,a1, a[2], (int __user *)a[3]); 19841da177e4SLinus Torvalds break; 19851da177e4SLinus Torvalds case SYS_SEND: 19861da177e4SLinus Torvalds err = sys_send(a0, (void __user *)a1, a[2], a[3]); 19871da177e4SLinus Torvalds break; 19881da177e4SLinus Torvalds case SYS_SENDTO: 19891da177e4SLinus Torvalds err = sys_sendto(a0,(void __user *)a1, a[2], a[3], 19901da177e4SLinus Torvalds (struct sockaddr __user *)a[4], a[5]); 19911da177e4SLinus Torvalds break; 19921da177e4SLinus Torvalds case SYS_RECV: 19931da177e4SLinus Torvalds err = sys_recv(a0, (void __user *)a1, a[2], a[3]); 19941da177e4SLinus Torvalds break; 19951da177e4SLinus Torvalds case SYS_RECVFROM: 19961da177e4SLinus Torvalds err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], 19971da177e4SLinus Torvalds (struct sockaddr __user *)a[4], (int __user *)a[5]); 19981da177e4SLinus Torvalds break; 19991da177e4SLinus Torvalds case SYS_SHUTDOWN: 20001da177e4SLinus Torvalds err = sys_shutdown(a0,a1); 20011da177e4SLinus Torvalds break; 20021da177e4SLinus Torvalds case SYS_SETSOCKOPT: 20031da177e4SLinus Torvalds err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); 20041da177e4SLinus Torvalds break; 20051da177e4SLinus Torvalds case SYS_GETSOCKOPT: 20061da177e4SLinus Torvalds err = sys_getsockopt(a0, a1, a[2], (char __user *)a[3], (int __user *)a[4]); 20071da177e4SLinus Torvalds break; 20081da177e4SLinus Torvalds case SYS_SENDMSG: 20091da177e4SLinus Torvalds err = sys_sendmsg(a0, (struct msghdr __user *) a1, a[2]); 20101da177e4SLinus Torvalds break; 20111da177e4SLinus Torvalds case SYS_RECVMSG: 20121da177e4SLinus Torvalds err = sys_recvmsg(a0, (struct msghdr __user *) a1, a[2]); 20131da177e4SLinus Torvalds break; 20141da177e4SLinus Torvalds default: 20151da177e4SLinus Torvalds err = -EINVAL; 20161da177e4SLinus Torvalds break; 20171da177e4SLinus Torvalds } 20181da177e4SLinus Torvalds return err; 20191da177e4SLinus Torvalds } 20201da177e4SLinus Torvalds 20211da177e4SLinus Torvalds #endif /* __ARCH_WANT_SYS_SOCKETCALL */ 20221da177e4SLinus Torvalds 20231da177e4SLinus Torvalds /* 20241da177e4SLinus Torvalds * This function is called by a protocol handler that wants to 20251da177e4SLinus Torvalds * advertise its address family, and have it linked into the 20261da177e4SLinus Torvalds * SOCKET module. 20271da177e4SLinus Torvalds */ 20281da177e4SLinus Torvalds 20291da177e4SLinus Torvalds int sock_register(struct net_proto_family *ops) 20301da177e4SLinus Torvalds { 20311da177e4SLinus Torvalds int err; 20321da177e4SLinus Torvalds 20331da177e4SLinus Torvalds if (ops->family >= NPROTO) { 20341da177e4SLinus Torvalds printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); 20351da177e4SLinus Torvalds return -ENOBUFS; 20361da177e4SLinus Torvalds } 20371da177e4SLinus Torvalds net_family_write_lock(); 20381da177e4SLinus Torvalds err = -EEXIST; 20391da177e4SLinus Torvalds if (net_families[ops->family] == NULL) { 20401da177e4SLinus Torvalds net_families[ops->family]=ops; 20411da177e4SLinus Torvalds err = 0; 20421da177e4SLinus Torvalds } 20431da177e4SLinus Torvalds net_family_write_unlock(); 20441da177e4SLinus Torvalds printk(KERN_INFO "NET: Registered protocol family %d\n", 20451da177e4SLinus Torvalds ops->family); 20461da177e4SLinus Torvalds return err; 20471da177e4SLinus Torvalds } 20481da177e4SLinus Torvalds 20491da177e4SLinus Torvalds /* 20501da177e4SLinus Torvalds * This function is called by a protocol handler that wants to 20511da177e4SLinus Torvalds * remove its address family, and have it unlinked from the 20521da177e4SLinus Torvalds * SOCKET module. 20531da177e4SLinus Torvalds */ 20541da177e4SLinus Torvalds 20551da177e4SLinus Torvalds int sock_unregister(int family) 20561da177e4SLinus Torvalds { 20571da177e4SLinus Torvalds if (family < 0 || family >= NPROTO) 20581da177e4SLinus Torvalds return -1; 20591da177e4SLinus Torvalds 20601da177e4SLinus Torvalds net_family_write_lock(); 20611da177e4SLinus Torvalds net_families[family]=NULL; 20621da177e4SLinus Torvalds net_family_write_unlock(); 20631da177e4SLinus Torvalds printk(KERN_INFO "NET: Unregistered protocol family %d\n", 20641da177e4SLinus Torvalds family); 20651da177e4SLinus Torvalds return 0; 20661da177e4SLinus Torvalds } 20671da177e4SLinus Torvalds 206877d76ea3SAndi Kleen static int __init sock_init(void) 20691da177e4SLinus Torvalds { 20701da177e4SLinus Torvalds /* 20711da177e4SLinus Torvalds * Initialize sock SLAB cache. 20721da177e4SLinus Torvalds */ 20731da177e4SLinus Torvalds 20741da177e4SLinus Torvalds sk_init(); 20751da177e4SLinus Torvalds 20761da177e4SLinus Torvalds /* 20771da177e4SLinus Torvalds * Initialize skbuff SLAB cache 20781da177e4SLinus Torvalds */ 20791da177e4SLinus Torvalds skb_init(); 20801da177e4SLinus Torvalds 20811da177e4SLinus Torvalds /* 20821da177e4SLinus Torvalds * Initialize the protocols module. 20831da177e4SLinus Torvalds */ 20841da177e4SLinus Torvalds 20851da177e4SLinus Torvalds init_inodecache(); 20861da177e4SLinus Torvalds register_filesystem(&sock_fs_type); 20871da177e4SLinus Torvalds sock_mnt = kern_mount(&sock_fs_type); 208877d76ea3SAndi Kleen 208977d76ea3SAndi Kleen /* The real protocol initialization is performed in later initcalls. 20901da177e4SLinus Torvalds */ 20911da177e4SLinus Torvalds 20921da177e4SLinus Torvalds #ifdef CONFIG_NETFILTER 20931da177e4SLinus Torvalds netfilter_init(); 20941da177e4SLinus Torvalds #endif 2095cbeb321aSDavid S. Miller 2096cbeb321aSDavid S. Miller return 0; 20971da177e4SLinus Torvalds } 20981da177e4SLinus Torvalds 209977d76ea3SAndi Kleen core_initcall(sock_init); /* early initcall */ 210077d76ea3SAndi Kleen 21011da177e4SLinus Torvalds #ifdef CONFIG_PROC_FS 21021da177e4SLinus Torvalds void socket_seq_show(struct seq_file *seq) 21031da177e4SLinus Torvalds { 21041da177e4SLinus Torvalds int cpu; 21051da177e4SLinus Torvalds int counter = 0; 21061da177e4SLinus Torvalds 210788a2a4acSEric Dumazet for_each_cpu(cpu) 21081da177e4SLinus Torvalds counter += per_cpu(sockets_in_use, cpu); 21091da177e4SLinus Torvalds 21101da177e4SLinus Torvalds /* It can be negative, by the way. 8) */ 21111da177e4SLinus Torvalds if (counter < 0) 21121da177e4SLinus Torvalds counter = 0; 21131da177e4SLinus Torvalds 21141da177e4SLinus Torvalds seq_printf(seq, "sockets: used %d\n", counter); 21151da177e4SLinus Torvalds } 21161da177e4SLinus Torvalds #endif /* CONFIG_PROC_FS */ 21171da177e4SLinus Torvalds 21181da177e4SLinus Torvalds /* ABI emulation layers need these two */ 21191da177e4SLinus Torvalds EXPORT_SYMBOL(move_addr_to_kernel); 21201da177e4SLinus Torvalds EXPORT_SYMBOL(move_addr_to_user); 21211da177e4SLinus Torvalds EXPORT_SYMBOL(sock_create); 21221da177e4SLinus Torvalds EXPORT_SYMBOL(sock_create_kern); 21231da177e4SLinus Torvalds EXPORT_SYMBOL(sock_create_lite); 21241da177e4SLinus Torvalds EXPORT_SYMBOL(sock_map_fd); 21251da177e4SLinus Torvalds EXPORT_SYMBOL(sock_recvmsg); 21261da177e4SLinus Torvalds EXPORT_SYMBOL(sock_register); 21271da177e4SLinus Torvalds EXPORT_SYMBOL(sock_release); 21281da177e4SLinus Torvalds EXPORT_SYMBOL(sock_sendmsg); 21291da177e4SLinus Torvalds EXPORT_SYMBOL(sock_unregister); 21301da177e4SLinus Torvalds EXPORT_SYMBOL(sock_wake_async); 21311da177e4SLinus Torvalds EXPORT_SYMBOL(sockfd_lookup); 21321da177e4SLinus Torvalds EXPORT_SYMBOL(kernel_sendmsg); 21331da177e4SLinus Torvalds EXPORT_SYMBOL(kernel_recvmsg); 2134