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> 871da177e4SLinus Torvalds 881da177e4SLinus Torvalds #ifdef CONFIG_NET_RADIO 891da177e4SLinus Torvalds #include <linux/wireless.h> /* Note : will define WIRELESS_EXT */ 901da177e4SLinus Torvalds #endif /* CONFIG_NET_RADIO */ 911da177e4SLinus Torvalds 921da177e4SLinus Torvalds #include <asm/uaccess.h> 931da177e4SLinus Torvalds #include <asm/unistd.h> 941da177e4SLinus Torvalds 951da177e4SLinus Torvalds #include <net/compat.h> 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds #include <net/sock.h> 981da177e4SLinus Torvalds #include <linux/netfilter.h> 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds static int sock_no_open(struct inode *irrelevant, struct file *dontcare); 1011da177e4SLinus Torvalds static ssize_t sock_aio_read(struct kiocb *iocb, char __user *buf, 1021da177e4SLinus Torvalds size_t size, loff_t pos); 1031da177e4SLinus Torvalds static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *buf, 1041da177e4SLinus Torvalds size_t size, loff_t pos); 1051da177e4SLinus Torvalds static int sock_mmap(struct file *file, struct vm_area_struct * vma); 1061da177e4SLinus Torvalds 1071da177e4SLinus Torvalds static int sock_close(struct inode *inode, struct file *file); 1081da177e4SLinus Torvalds static unsigned int sock_poll(struct file *file, 1091da177e4SLinus Torvalds struct poll_table_struct *wait); 1101da177e4SLinus Torvalds static long sock_ioctl(struct file *file, 1111da177e4SLinus Torvalds unsigned int cmd, unsigned long arg); 1121da177e4SLinus Torvalds static int sock_fasync(int fd, struct file *filp, int on); 1131da177e4SLinus Torvalds static ssize_t sock_readv(struct file *file, const struct iovec *vector, 1141da177e4SLinus Torvalds unsigned long count, loff_t *ppos); 1151da177e4SLinus Torvalds static ssize_t sock_writev(struct file *file, const struct iovec *vector, 1161da177e4SLinus Torvalds unsigned long count, loff_t *ppos); 1171da177e4SLinus Torvalds static ssize_t sock_sendpage(struct file *file, struct page *page, 1181da177e4SLinus Torvalds int offset, size_t size, loff_t *ppos, int more); 1191da177e4SLinus Torvalds 1201da177e4SLinus Torvalds 1211da177e4SLinus Torvalds /* 1221da177e4SLinus Torvalds * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear 1231da177e4SLinus Torvalds * in the operation structures but are done directly via the socketcall() multiplexor. 1241da177e4SLinus Torvalds */ 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds static struct file_operations socket_file_ops = { 1271da177e4SLinus Torvalds .owner = THIS_MODULE, 1281da177e4SLinus Torvalds .llseek = no_llseek, 1291da177e4SLinus Torvalds .aio_read = sock_aio_read, 1301da177e4SLinus Torvalds .aio_write = sock_aio_write, 1311da177e4SLinus Torvalds .poll = sock_poll, 1321da177e4SLinus Torvalds .unlocked_ioctl = sock_ioctl, 1331da177e4SLinus Torvalds .mmap = sock_mmap, 1341da177e4SLinus Torvalds .open = sock_no_open, /* special open code to disallow open via /proc */ 1351da177e4SLinus Torvalds .release = sock_close, 1361da177e4SLinus Torvalds .fasync = sock_fasync, 1371da177e4SLinus Torvalds .readv = sock_readv, 1381da177e4SLinus Torvalds .writev = sock_writev, 1391da177e4SLinus Torvalds .sendpage = sock_sendpage 1401da177e4SLinus Torvalds }; 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds /* 1431da177e4SLinus Torvalds * The protocol list. Each protocol is registered in here. 1441da177e4SLinus Torvalds */ 1451da177e4SLinus Torvalds 1461da177e4SLinus Torvalds static struct net_proto_family *net_families[NPROTO]; 1471da177e4SLinus Torvalds 1481da177e4SLinus Torvalds #if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT) 1491da177e4SLinus Torvalds static atomic_t net_family_lockct = ATOMIC_INIT(0); 1501da177e4SLinus Torvalds static DEFINE_SPINLOCK(net_family_lock); 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds /* The strategy is: modifications net_family vector are short, do not 1531da177e4SLinus Torvalds sleep and veeery rare, but read access should be free of any exclusive 1541da177e4SLinus Torvalds locks. 1551da177e4SLinus Torvalds */ 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds static void net_family_write_lock(void) 1581da177e4SLinus Torvalds { 1591da177e4SLinus Torvalds spin_lock(&net_family_lock); 1601da177e4SLinus Torvalds while (atomic_read(&net_family_lockct) != 0) { 1611da177e4SLinus Torvalds spin_unlock(&net_family_lock); 1621da177e4SLinus Torvalds 1631da177e4SLinus Torvalds yield(); 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds spin_lock(&net_family_lock); 1661da177e4SLinus Torvalds } 1671da177e4SLinus Torvalds } 1681da177e4SLinus Torvalds 1691da177e4SLinus Torvalds static __inline__ void net_family_write_unlock(void) 1701da177e4SLinus Torvalds { 1711da177e4SLinus Torvalds spin_unlock(&net_family_lock); 1721da177e4SLinus Torvalds } 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvalds static __inline__ void net_family_read_lock(void) 1751da177e4SLinus Torvalds { 1761da177e4SLinus Torvalds atomic_inc(&net_family_lockct); 1771da177e4SLinus Torvalds spin_unlock_wait(&net_family_lock); 1781da177e4SLinus Torvalds } 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvalds static __inline__ void net_family_read_unlock(void) 1811da177e4SLinus Torvalds { 1821da177e4SLinus Torvalds atomic_dec(&net_family_lockct); 1831da177e4SLinus Torvalds } 1841da177e4SLinus Torvalds 1851da177e4SLinus Torvalds #else 1861da177e4SLinus Torvalds #define net_family_write_lock() do { } while(0) 1871da177e4SLinus Torvalds #define net_family_write_unlock() do { } while(0) 1881da177e4SLinus Torvalds #define net_family_read_lock() do { } while(0) 1891da177e4SLinus Torvalds #define net_family_read_unlock() do { } while(0) 1901da177e4SLinus Torvalds #endif 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvalds /* 1941da177e4SLinus Torvalds * Statistics counters of the socket lists 1951da177e4SLinus Torvalds */ 1961da177e4SLinus Torvalds 1971da177e4SLinus Torvalds static DEFINE_PER_CPU(int, sockets_in_use) = 0; 1981da177e4SLinus Torvalds 1991da177e4SLinus Torvalds /* 2001da177e4SLinus Torvalds * Support routines. Move socket addresses back and forth across the kernel/user 2011da177e4SLinus Torvalds * divide and look after the messy bits. 2021da177e4SLinus Torvalds */ 2031da177e4SLinus Torvalds 2041da177e4SLinus Torvalds #define MAX_SOCK_ADDR 128 /* 108 for Unix domain - 2051da177e4SLinus Torvalds 16 for IP, 16 for IPX, 2061da177e4SLinus Torvalds 24 for IPv6, 2071da177e4SLinus Torvalds about 80 for AX.25 2081da177e4SLinus Torvalds must be at least one bigger than 2091da177e4SLinus Torvalds the AF_UNIX size (see net/unix/af_unix.c 2101da177e4SLinus Torvalds :unix_mkname()). 2111da177e4SLinus Torvalds */ 2121da177e4SLinus Torvalds 2131da177e4SLinus Torvalds /** 2141da177e4SLinus Torvalds * move_addr_to_kernel - copy a socket address into kernel space 2151da177e4SLinus Torvalds * @uaddr: Address in user space 2161da177e4SLinus Torvalds * @kaddr: Address in kernel space 2171da177e4SLinus Torvalds * @ulen: Length in user space 2181da177e4SLinus Torvalds * 2191da177e4SLinus Torvalds * The address is copied into kernel space. If the provided address is 2201da177e4SLinus Torvalds * too long an error code of -EINVAL is returned. If the copy gives 2211da177e4SLinus Torvalds * invalid addresses -EFAULT is returned. On a success 0 is returned. 2221da177e4SLinus Torvalds */ 2231da177e4SLinus Torvalds 2241da177e4SLinus Torvalds int move_addr_to_kernel(void __user *uaddr, int ulen, void *kaddr) 2251da177e4SLinus Torvalds { 2261da177e4SLinus Torvalds if(ulen<0||ulen>MAX_SOCK_ADDR) 2271da177e4SLinus Torvalds return -EINVAL; 2281da177e4SLinus Torvalds if(ulen==0) 2291da177e4SLinus Torvalds return 0; 2301da177e4SLinus Torvalds if(copy_from_user(kaddr,uaddr,ulen)) 2311da177e4SLinus Torvalds return -EFAULT; 2323ec3b2fbSDavid Woodhouse return audit_sockaddr(ulen, kaddr); 2331da177e4SLinus Torvalds } 2341da177e4SLinus Torvalds 2351da177e4SLinus Torvalds /** 2361da177e4SLinus Torvalds * move_addr_to_user - copy an address to user space 2371da177e4SLinus Torvalds * @kaddr: kernel space address 2381da177e4SLinus Torvalds * @klen: length of address in kernel 2391da177e4SLinus Torvalds * @uaddr: user space address 2401da177e4SLinus Torvalds * @ulen: pointer to user length field 2411da177e4SLinus Torvalds * 2421da177e4SLinus Torvalds * The value pointed to by ulen on entry is the buffer length available. 2431da177e4SLinus Torvalds * This is overwritten with the buffer space used. -EINVAL is returned 2441da177e4SLinus Torvalds * if an overlong buffer is specified or a negative buffer size. -EFAULT 2451da177e4SLinus Torvalds * is returned if either the buffer or the length field are not 2461da177e4SLinus Torvalds * accessible. 2471da177e4SLinus Torvalds * After copying the data up to the limit the user specifies, the true 2481da177e4SLinus Torvalds * length of the data is written over the length limit the user 2491da177e4SLinus Torvalds * specified. Zero is returned for a success. 2501da177e4SLinus Torvalds */ 2511da177e4SLinus Torvalds 2521da177e4SLinus Torvalds int move_addr_to_user(void *kaddr, int klen, void __user *uaddr, int __user *ulen) 2531da177e4SLinus Torvalds { 2541da177e4SLinus Torvalds int err; 2551da177e4SLinus Torvalds int len; 2561da177e4SLinus Torvalds 2571da177e4SLinus Torvalds if((err=get_user(len, ulen))) 2581da177e4SLinus Torvalds return err; 2591da177e4SLinus Torvalds if(len>klen) 2601da177e4SLinus Torvalds len=klen; 2611da177e4SLinus Torvalds if(len<0 || len> MAX_SOCK_ADDR) 2621da177e4SLinus Torvalds return -EINVAL; 2631da177e4SLinus Torvalds if(len) 2641da177e4SLinus Torvalds { 2651da177e4SLinus Torvalds if(copy_to_user(uaddr,kaddr,len)) 2661da177e4SLinus Torvalds return -EFAULT; 2671da177e4SLinus Torvalds } 2681da177e4SLinus Torvalds /* 2691da177e4SLinus Torvalds * "fromlen shall refer to the value before truncation.." 2701da177e4SLinus Torvalds * 1003.1g 2711da177e4SLinus Torvalds */ 2721da177e4SLinus Torvalds return __put_user(klen, ulen); 2731da177e4SLinus Torvalds } 2741da177e4SLinus Torvalds 2751da177e4SLinus Torvalds #define SOCKFS_MAGIC 0x534F434B 2761da177e4SLinus Torvalds 277ba89966cSEric Dumazet static kmem_cache_t * sock_inode_cachep __read_mostly; 2781da177e4SLinus Torvalds 2791da177e4SLinus Torvalds static struct inode *sock_alloc_inode(struct super_block *sb) 2801da177e4SLinus Torvalds { 2811da177e4SLinus Torvalds struct socket_alloc *ei; 2821da177e4SLinus Torvalds ei = (struct socket_alloc *)kmem_cache_alloc(sock_inode_cachep, SLAB_KERNEL); 2831da177e4SLinus Torvalds if (!ei) 2841da177e4SLinus Torvalds return NULL; 2851da177e4SLinus Torvalds init_waitqueue_head(&ei->socket.wait); 2861da177e4SLinus Torvalds 2871da177e4SLinus Torvalds ei->socket.fasync_list = NULL; 2881da177e4SLinus Torvalds ei->socket.state = SS_UNCONNECTED; 2891da177e4SLinus Torvalds ei->socket.flags = 0; 2901da177e4SLinus Torvalds ei->socket.ops = NULL; 2911da177e4SLinus Torvalds ei->socket.sk = NULL; 2921da177e4SLinus Torvalds ei->socket.file = NULL; 2931da177e4SLinus Torvalds ei->socket.flags = 0; 2941da177e4SLinus Torvalds 2951da177e4SLinus Torvalds return &ei->vfs_inode; 2961da177e4SLinus Torvalds } 2971da177e4SLinus Torvalds 2981da177e4SLinus Torvalds static void sock_destroy_inode(struct inode *inode) 2991da177e4SLinus Torvalds { 3001da177e4SLinus Torvalds kmem_cache_free(sock_inode_cachep, 3011da177e4SLinus Torvalds container_of(inode, struct socket_alloc, vfs_inode)); 3021da177e4SLinus Torvalds } 3031da177e4SLinus Torvalds 3041da177e4SLinus Torvalds static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) 3051da177e4SLinus Torvalds { 3061da177e4SLinus Torvalds struct socket_alloc *ei = (struct socket_alloc *) foo; 3071da177e4SLinus Torvalds 3081da177e4SLinus Torvalds if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == 3091da177e4SLinus Torvalds SLAB_CTOR_CONSTRUCTOR) 3101da177e4SLinus Torvalds inode_init_once(&ei->vfs_inode); 3111da177e4SLinus Torvalds } 3121da177e4SLinus Torvalds 3131da177e4SLinus Torvalds static int init_inodecache(void) 3141da177e4SLinus Torvalds { 3151da177e4SLinus Torvalds sock_inode_cachep = kmem_cache_create("sock_inode_cache", 3161da177e4SLinus Torvalds sizeof(struct socket_alloc), 3171da177e4SLinus Torvalds 0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT, 3181da177e4SLinus Torvalds init_once, NULL); 3191da177e4SLinus Torvalds if (sock_inode_cachep == NULL) 3201da177e4SLinus Torvalds return -ENOMEM; 3211da177e4SLinus Torvalds return 0; 3221da177e4SLinus Torvalds } 3231da177e4SLinus Torvalds 3241da177e4SLinus Torvalds static struct super_operations sockfs_ops = { 3251da177e4SLinus Torvalds .alloc_inode = sock_alloc_inode, 3261da177e4SLinus Torvalds .destroy_inode =sock_destroy_inode, 3271da177e4SLinus Torvalds .statfs = simple_statfs, 3281da177e4SLinus Torvalds }; 3291da177e4SLinus Torvalds 3301da177e4SLinus Torvalds static struct super_block *sockfs_get_sb(struct file_system_type *fs_type, 3311da177e4SLinus Torvalds int flags, const char *dev_name, void *data) 3321da177e4SLinus Torvalds { 3331da177e4SLinus Torvalds return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC); 3341da177e4SLinus Torvalds } 3351da177e4SLinus Torvalds 336ba89966cSEric Dumazet static struct vfsmount *sock_mnt __read_mostly; 3371da177e4SLinus Torvalds 3381da177e4SLinus Torvalds static struct file_system_type sock_fs_type = { 3391da177e4SLinus Torvalds .name = "sockfs", 3401da177e4SLinus Torvalds .get_sb = sockfs_get_sb, 3411da177e4SLinus Torvalds .kill_sb = kill_anon_super, 3421da177e4SLinus Torvalds }; 3431da177e4SLinus Torvalds static int sockfs_delete_dentry(struct dentry *dentry) 3441da177e4SLinus Torvalds { 3451da177e4SLinus Torvalds return 1; 3461da177e4SLinus Torvalds } 3471da177e4SLinus Torvalds static struct dentry_operations sockfs_dentry_operations = { 3481da177e4SLinus Torvalds .d_delete = sockfs_delete_dentry, 3491da177e4SLinus Torvalds }; 3501da177e4SLinus Torvalds 3511da177e4SLinus Torvalds /* 3521da177e4SLinus Torvalds * Obtains the first available file descriptor and sets it up for use. 3531da177e4SLinus Torvalds * 3541da177e4SLinus Torvalds * This function creates file structure and maps it to fd space 3551da177e4SLinus Torvalds * of current process. On success it returns file descriptor 3561da177e4SLinus Torvalds * and file struct implicitly stored in sock->file. 3571da177e4SLinus Torvalds * Note that another thread may close file descriptor before we return 3581da177e4SLinus Torvalds * from this function. We use the fact that now we do not refer 3591da177e4SLinus Torvalds * to socket after mapping. If one day we will need it, this 3601da177e4SLinus Torvalds * function will increment ref. count on file by 1. 3611da177e4SLinus Torvalds * 3621da177e4SLinus Torvalds * In any case returned fd MAY BE not valid! 3631da177e4SLinus Torvalds * This race condition is unavoidable 3641da177e4SLinus Torvalds * with shared fd spaces, we cannot solve it inside kernel, 3651da177e4SLinus Torvalds * but we take care of internal coherence yet. 3661da177e4SLinus Torvalds */ 3671da177e4SLinus Torvalds 3681da177e4SLinus Torvalds int sock_map_fd(struct socket *sock) 3691da177e4SLinus Torvalds { 3701da177e4SLinus Torvalds int fd; 3711da177e4SLinus Torvalds struct qstr this; 3721da177e4SLinus Torvalds char name[32]; 3731da177e4SLinus Torvalds 3741da177e4SLinus Torvalds /* 3751da177e4SLinus Torvalds * Find a file descriptor suitable for return to the user. 3761da177e4SLinus Torvalds */ 3771da177e4SLinus Torvalds 3781da177e4SLinus Torvalds fd = get_unused_fd(); 3791da177e4SLinus Torvalds if (fd >= 0) { 3801da177e4SLinus Torvalds struct file *file = get_empty_filp(); 3811da177e4SLinus Torvalds 3821da177e4SLinus Torvalds if (!file) { 3831da177e4SLinus Torvalds put_unused_fd(fd); 3841da177e4SLinus Torvalds fd = -ENFILE; 3851da177e4SLinus Torvalds goto out; 3861da177e4SLinus Torvalds } 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); 3931da177e4SLinus Torvalds if (!file->f_dentry) { 3941da177e4SLinus Torvalds put_filp(file); 3951da177e4SLinus Torvalds put_unused_fd(fd); 3961da177e4SLinus Torvalds fd = -ENOMEM; 3971da177e4SLinus Torvalds goto out; 3981da177e4SLinus Torvalds } 3991da177e4SLinus Torvalds file->f_dentry->d_op = &sockfs_dentry_operations; 4001da177e4SLinus Torvalds d_add(file->f_dentry, SOCK_INODE(sock)); 4011da177e4SLinus Torvalds file->f_vfsmnt = mntget(sock_mnt); 4021da177e4SLinus Torvalds file->f_mapping = file->f_dentry->d_inode->i_mapping; 4031da177e4SLinus Torvalds 4041da177e4SLinus Torvalds sock->file = file; 4051da177e4SLinus Torvalds file->f_op = SOCK_INODE(sock)->i_fop = &socket_file_ops; 4061da177e4SLinus Torvalds file->f_mode = FMODE_READ | FMODE_WRITE; 4071da177e4SLinus Torvalds file->f_flags = O_RDWR; 4081da177e4SLinus Torvalds file->f_pos = 0; 40907dc3f07SBenjamin LaHaise file->private_data = sock; 4101da177e4SLinus Torvalds fd_install(fd, file); 4111da177e4SLinus Torvalds } 4121da177e4SLinus Torvalds 4131da177e4SLinus Torvalds out: 4141da177e4SLinus Torvalds return fd; 4151da177e4SLinus Torvalds } 4161da177e4SLinus Torvalds 4171da177e4SLinus Torvalds /** 4181da177e4SLinus Torvalds * sockfd_lookup - Go from a file number to its socket slot 4191da177e4SLinus Torvalds * @fd: file handle 4201da177e4SLinus Torvalds * @err: pointer to an error code return 4211da177e4SLinus Torvalds * 4221da177e4SLinus Torvalds * The file handle passed in is locked and the socket it is bound 4231da177e4SLinus Torvalds * too is returned. If an error occurs the err pointer is overwritten 4241da177e4SLinus Torvalds * with a negative errno code and NULL is returned. The function checks 4251da177e4SLinus Torvalds * for both invalid handles and passing a handle which is not a socket. 4261da177e4SLinus Torvalds * 4271da177e4SLinus Torvalds * On a success the socket object pointer is returned. 4281da177e4SLinus Torvalds */ 4291da177e4SLinus Torvalds 4301da177e4SLinus Torvalds struct socket *sockfd_lookup(int fd, int *err) 4311da177e4SLinus Torvalds { 4321da177e4SLinus Torvalds struct file *file; 4331da177e4SLinus Torvalds struct inode *inode; 4341da177e4SLinus Torvalds struct socket *sock; 4351da177e4SLinus Torvalds 4361da177e4SLinus Torvalds if (!(file = fget(fd))) 4371da177e4SLinus Torvalds { 4381da177e4SLinus Torvalds *err = -EBADF; 4391da177e4SLinus Torvalds return NULL; 4401da177e4SLinus Torvalds } 4411da177e4SLinus Torvalds 44207dc3f07SBenjamin LaHaise if (file->f_op == &socket_file_ops) 44307dc3f07SBenjamin LaHaise return file->private_data; /* set in sock_map_fd */ 44407dc3f07SBenjamin LaHaise 4451da177e4SLinus Torvalds inode = file->f_dentry->d_inode; 4461da177e4SLinus Torvalds if (!S_ISSOCK(inode->i_mode)) { 4471da177e4SLinus Torvalds *err = -ENOTSOCK; 4481da177e4SLinus Torvalds fput(file); 4491da177e4SLinus Torvalds return NULL; 4501da177e4SLinus Torvalds } 4511da177e4SLinus Torvalds 4521da177e4SLinus Torvalds sock = SOCKET_I(inode); 4531da177e4SLinus Torvalds if (sock->file != file) { 4541da177e4SLinus Torvalds printk(KERN_ERR "socki_lookup: socket file changed!\n"); 4551da177e4SLinus Torvalds sock->file = file; 4561da177e4SLinus Torvalds } 4571da177e4SLinus Torvalds return sock; 4581da177e4SLinus Torvalds } 4591da177e4SLinus Torvalds 4601da177e4SLinus Torvalds /** 4611da177e4SLinus Torvalds * sock_alloc - allocate a socket 4621da177e4SLinus Torvalds * 4631da177e4SLinus Torvalds * Allocate a new inode and socket object. The two are bound together 4641da177e4SLinus Torvalds * and initialised. The socket is then returned. If we are out of inodes 4651da177e4SLinus Torvalds * NULL is returned. 4661da177e4SLinus Torvalds */ 4671da177e4SLinus Torvalds 4681da177e4SLinus Torvalds static struct socket *sock_alloc(void) 4691da177e4SLinus Torvalds { 4701da177e4SLinus Torvalds struct inode * inode; 4711da177e4SLinus Torvalds struct socket * sock; 4721da177e4SLinus Torvalds 4731da177e4SLinus Torvalds inode = new_inode(sock_mnt->mnt_sb); 4741da177e4SLinus Torvalds if (!inode) 4751da177e4SLinus Torvalds return NULL; 4761da177e4SLinus Torvalds 4771da177e4SLinus Torvalds sock = SOCKET_I(inode); 4781da177e4SLinus Torvalds 4791da177e4SLinus Torvalds inode->i_mode = S_IFSOCK|S_IRWXUGO; 4801da177e4SLinus Torvalds inode->i_uid = current->fsuid; 4811da177e4SLinus Torvalds inode->i_gid = current->fsgid; 4821da177e4SLinus Torvalds 4831da177e4SLinus Torvalds get_cpu_var(sockets_in_use)++; 4841da177e4SLinus Torvalds put_cpu_var(sockets_in_use); 4851da177e4SLinus Torvalds return sock; 4861da177e4SLinus Torvalds } 4871da177e4SLinus Torvalds 4881da177e4SLinus Torvalds /* 4891da177e4SLinus Torvalds * In theory you can't get an open on this inode, but /proc provides 4901da177e4SLinus Torvalds * a back door. Remember to keep it shut otherwise you'll let the 4911da177e4SLinus Torvalds * creepy crawlies in. 4921da177e4SLinus Torvalds */ 4931da177e4SLinus Torvalds 4941da177e4SLinus Torvalds static int sock_no_open(struct inode *irrelevant, struct file *dontcare) 4951da177e4SLinus Torvalds { 4961da177e4SLinus Torvalds return -ENXIO; 4971da177e4SLinus Torvalds } 4981da177e4SLinus Torvalds 4991da177e4SLinus Torvalds struct file_operations bad_sock_fops = { 5001da177e4SLinus Torvalds .owner = THIS_MODULE, 5011da177e4SLinus Torvalds .open = sock_no_open, 5021da177e4SLinus Torvalds }; 5031da177e4SLinus Torvalds 5041da177e4SLinus Torvalds /** 5051da177e4SLinus Torvalds * sock_release - close a socket 5061da177e4SLinus Torvalds * @sock: socket to close 5071da177e4SLinus Torvalds * 5081da177e4SLinus Torvalds * The socket is released from the protocol stack if it has a release 5091da177e4SLinus Torvalds * callback, and the inode is then released if the socket is bound to 5101da177e4SLinus Torvalds * an inode not a file. 5111da177e4SLinus Torvalds */ 5121da177e4SLinus Torvalds 5131da177e4SLinus Torvalds void sock_release(struct socket *sock) 5141da177e4SLinus Torvalds { 5151da177e4SLinus Torvalds if (sock->ops) { 5161da177e4SLinus Torvalds struct module *owner = sock->ops->owner; 5171da177e4SLinus Torvalds 5181da177e4SLinus Torvalds sock->ops->release(sock); 5191da177e4SLinus Torvalds sock->ops = NULL; 5201da177e4SLinus Torvalds module_put(owner); 5211da177e4SLinus Torvalds } 5221da177e4SLinus Torvalds 5231da177e4SLinus Torvalds if (sock->fasync_list) 5241da177e4SLinus Torvalds printk(KERN_ERR "sock_release: fasync list not empty!\n"); 5251da177e4SLinus Torvalds 5261da177e4SLinus Torvalds get_cpu_var(sockets_in_use)--; 5271da177e4SLinus Torvalds put_cpu_var(sockets_in_use); 5281da177e4SLinus Torvalds if (!sock->file) { 5291da177e4SLinus Torvalds iput(SOCK_INODE(sock)); 5301da177e4SLinus Torvalds return; 5311da177e4SLinus Torvalds } 5321da177e4SLinus Torvalds sock->file=NULL; 5331da177e4SLinus Torvalds } 5341da177e4SLinus Torvalds 5351da177e4SLinus Torvalds static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock, 5361da177e4SLinus Torvalds struct msghdr *msg, size_t size) 5371da177e4SLinus Torvalds { 5381da177e4SLinus Torvalds struct sock_iocb *si = kiocb_to_siocb(iocb); 5391da177e4SLinus Torvalds int err; 5401da177e4SLinus Torvalds 5411da177e4SLinus Torvalds si->sock = sock; 5421da177e4SLinus Torvalds si->scm = NULL; 5431da177e4SLinus Torvalds si->msg = msg; 5441da177e4SLinus Torvalds si->size = size; 5451da177e4SLinus Torvalds 5461da177e4SLinus Torvalds err = security_socket_sendmsg(sock, msg, size); 5471da177e4SLinus Torvalds if (err) 5481da177e4SLinus Torvalds return err; 5491da177e4SLinus Torvalds 5501da177e4SLinus Torvalds return sock->ops->sendmsg(iocb, sock, msg, size); 5511da177e4SLinus Torvalds } 5521da177e4SLinus Torvalds 5531da177e4SLinus Torvalds int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 5541da177e4SLinus Torvalds { 5551da177e4SLinus Torvalds struct kiocb iocb; 5561da177e4SLinus Torvalds struct sock_iocb siocb; 5571da177e4SLinus Torvalds int ret; 5581da177e4SLinus Torvalds 5591da177e4SLinus Torvalds init_sync_kiocb(&iocb, NULL); 5601da177e4SLinus Torvalds iocb.private = &siocb; 5611da177e4SLinus Torvalds ret = __sock_sendmsg(&iocb, sock, msg, size); 5621da177e4SLinus Torvalds if (-EIOCBQUEUED == ret) 5631da177e4SLinus Torvalds ret = wait_on_sync_kiocb(&iocb); 5641da177e4SLinus Torvalds return ret; 5651da177e4SLinus Torvalds } 5661da177e4SLinus Torvalds 5671da177e4SLinus Torvalds int kernel_sendmsg(struct socket *sock, struct msghdr *msg, 5681da177e4SLinus Torvalds struct kvec *vec, size_t num, size_t size) 5691da177e4SLinus Torvalds { 5701da177e4SLinus Torvalds mm_segment_t oldfs = get_fs(); 5711da177e4SLinus Torvalds int result; 5721da177e4SLinus Torvalds 5731da177e4SLinus Torvalds set_fs(KERNEL_DS); 5741da177e4SLinus Torvalds /* 5751da177e4SLinus Torvalds * the following is safe, since for compiler definitions of kvec and 5761da177e4SLinus Torvalds * iovec are identical, yielding the same in-core layout and alignment 5771da177e4SLinus Torvalds */ 5781da177e4SLinus Torvalds msg->msg_iov = (struct iovec *)vec, 5791da177e4SLinus Torvalds msg->msg_iovlen = num; 5801da177e4SLinus Torvalds result = sock_sendmsg(sock, msg, size); 5811da177e4SLinus Torvalds set_fs(oldfs); 5821da177e4SLinus Torvalds return result; 5831da177e4SLinus Torvalds } 5841da177e4SLinus Torvalds 5851da177e4SLinus Torvalds static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock, 5861da177e4SLinus Torvalds struct msghdr *msg, size_t size, int flags) 5871da177e4SLinus Torvalds { 5881da177e4SLinus Torvalds int err; 5891da177e4SLinus Torvalds struct sock_iocb *si = kiocb_to_siocb(iocb); 5901da177e4SLinus Torvalds 5911da177e4SLinus Torvalds si->sock = sock; 5921da177e4SLinus Torvalds si->scm = NULL; 5931da177e4SLinus Torvalds si->msg = msg; 5941da177e4SLinus Torvalds si->size = size; 5951da177e4SLinus Torvalds si->flags = flags; 5961da177e4SLinus Torvalds 5971da177e4SLinus Torvalds err = security_socket_recvmsg(sock, msg, size, flags); 5981da177e4SLinus Torvalds if (err) 5991da177e4SLinus Torvalds return err; 6001da177e4SLinus Torvalds 6011da177e4SLinus Torvalds return sock->ops->recvmsg(iocb, sock, msg, size, flags); 6021da177e4SLinus Torvalds } 6031da177e4SLinus Torvalds 6041da177e4SLinus Torvalds int sock_recvmsg(struct socket *sock, struct msghdr *msg, 6051da177e4SLinus Torvalds size_t size, int flags) 6061da177e4SLinus Torvalds { 6071da177e4SLinus Torvalds struct kiocb iocb; 6081da177e4SLinus Torvalds struct sock_iocb siocb; 6091da177e4SLinus Torvalds int ret; 6101da177e4SLinus Torvalds 6111da177e4SLinus Torvalds init_sync_kiocb(&iocb, NULL); 6121da177e4SLinus Torvalds iocb.private = &siocb; 6131da177e4SLinus Torvalds ret = __sock_recvmsg(&iocb, sock, msg, size, flags); 6141da177e4SLinus Torvalds if (-EIOCBQUEUED == ret) 6151da177e4SLinus Torvalds ret = wait_on_sync_kiocb(&iocb); 6161da177e4SLinus Torvalds return ret; 6171da177e4SLinus Torvalds } 6181da177e4SLinus Torvalds 6191da177e4SLinus Torvalds int kernel_recvmsg(struct socket *sock, struct msghdr *msg, 6201da177e4SLinus Torvalds struct kvec *vec, size_t num, 6211da177e4SLinus Torvalds size_t size, int flags) 6221da177e4SLinus Torvalds { 6231da177e4SLinus Torvalds mm_segment_t oldfs = get_fs(); 6241da177e4SLinus Torvalds int result; 6251da177e4SLinus Torvalds 6261da177e4SLinus Torvalds set_fs(KERNEL_DS); 6271da177e4SLinus Torvalds /* 6281da177e4SLinus Torvalds * the following is safe, since for compiler definitions of kvec and 6291da177e4SLinus Torvalds * iovec are identical, yielding the same in-core layout and alignment 6301da177e4SLinus Torvalds */ 6311da177e4SLinus Torvalds msg->msg_iov = (struct iovec *)vec, 6321da177e4SLinus Torvalds msg->msg_iovlen = num; 6331da177e4SLinus Torvalds result = sock_recvmsg(sock, msg, size, flags); 6341da177e4SLinus Torvalds set_fs(oldfs); 6351da177e4SLinus Torvalds return result; 6361da177e4SLinus Torvalds } 6371da177e4SLinus Torvalds 6381da177e4SLinus Torvalds static void sock_aio_dtor(struct kiocb *iocb) 6391da177e4SLinus Torvalds { 6401da177e4SLinus Torvalds kfree(iocb->private); 6411da177e4SLinus Torvalds } 6421da177e4SLinus Torvalds 64320380731SArnaldo Carvalho de Melo static ssize_t sock_sendpage(struct file *file, struct page *page, 6441da177e4SLinus Torvalds int offset, size_t size, loff_t *ppos, int more) 6451da177e4SLinus Torvalds { 6461da177e4SLinus Torvalds struct socket *sock; 6471da177e4SLinus Torvalds int flags; 6481da177e4SLinus Torvalds 649b69aee04SEric Dumazet sock = file->private_data; 6501da177e4SLinus Torvalds 6511da177e4SLinus Torvalds flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; 6521da177e4SLinus Torvalds if (more) 6531da177e4SLinus Torvalds flags |= MSG_MORE; 6541da177e4SLinus Torvalds 6551da177e4SLinus Torvalds return sock->ops->sendpage(sock, page, offset, size, flags); 6561da177e4SLinus Torvalds } 6571da177e4SLinus Torvalds 658ce1d4d3eSChristoph Hellwig static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb, 659ce1d4d3eSChristoph Hellwig char __user *ubuf, size_t size, struct sock_iocb *siocb) 660ce1d4d3eSChristoph Hellwig { 661ce1d4d3eSChristoph Hellwig if (!is_sync_kiocb(iocb)) { 662ce1d4d3eSChristoph Hellwig siocb = kmalloc(sizeof(*siocb), GFP_KERNEL); 663ce1d4d3eSChristoph Hellwig if (!siocb) 664ce1d4d3eSChristoph Hellwig return NULL; 665ce1d4d3eSChristoph Hellwig iocb->ki_dtor = sock_aio_dtor; 666ce1d4d3eSChristoph Hellwig } 667ce1d4d3eSChristoph Hellwig 668ce1d4d3eSChristoph Hellwig siocb->kiocb = iocb; 669ce1d4d3eSChristoph Hellwig siocb->async_iov.iov_base = ubuf; 670ce1d4d3eSChristoph Hellwig siocb->async_iov.iov_len = size; 671ce1d4d3eSChristoph Hellwig 672ce1d4d3eSChristoph Hellwig iocb->private = siocb; 673ce1d4d3eSChristoph Hellwig return siocb; 674ce1d4d3eSChristoph Hellwig } 675ce1d4d3eSChristoph Hellwig 676ce1d4d3eSChristoph Hellwig static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb, 677ce1d4d3eSChristoph Hellwig struct file *file, struct iovec *iov, unsigned long nr_segs) 678ce1d4d3eSChristoph Hellwig { 679ce1d4d3eSChristoph Hellwig struct socket *sock = file->private_data; 680ce1d4d3eSChristoph Hellwig size_t size = 0; 681ce1d4d3eSChristoph Hellwig int i; 682ce1d4d3eSChristoph Hellwig 683ce1d4d3eSChristoph Hellwig for (i = 0 ; i < nr_segs ; i++) 684ce1d4d3eSChristoph Hellwig size += iov[i].iov_len; 685ce1d4d3eSChristoph Hellwig 686ce1d4d3eSChristoph Hellwig msg->msg_name = NULL; 687ce1d4d3eSChristoph Hellwig msg->msg_namelen = 0; 688ce1d4d3eSChristoph Hellwig msg->msg_control = NULL; 689ce1d4d3eSChristoph Hellwig msg->msg_controllen = 0; 690ce1d4d3eSChristoph Hellwig msg->msg_iov = (struct iovec *) iov; 691ce1d4d3eSChristoph Hellwig msg->msg_iovlen = nr_segs; 692ce1d4d3eSChristoph Hellwig msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; 693ce1d4d3eSChristoph Hellwig 694ce1d4d3eSChristoph Hellwig return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags); 695ce1d4d3eSChristoph Hellwig } 696ce1d4d3eSChristoph Hellwig 697ce1d4d3eSChristoph Hellwig static ssize_t sock_readv(struct file *file, const struct iovec *iov, 698ce1d4d3eSChristoph Hellwig unsigned long nr_segs, loff_t *ppos) 699ce1d4d3eSChristoph Hellwig { 700ce1d4d3eSChristoph Hellwig struct kiocb iocb; 701ce1d4d3eSChristoph Hellwig struct sock_iocb siocb; 702ce1d4d3eSChristoph Hellwig struct msghdr msg; 703ce1d4d3eSChristoph Hellwig int ret; 704ce1d4d3eSChristoph Hellwig 705ce1d4d3eSChristoph Hellwig init_sync_kiocb(&iocb, NULL); 706ce1d4d3eSChristoph Hellwig iocb.private = &siocb; 707ce1d4d3eSChristoph Hellwig 708ce1d4d3eSChristoph Hellwig ret = do_sock_read(&msg, &iocb, file, (struct iovec *)iov, nr_segs); 709ce1d4d3eSChristoph Hellwig if (-EIOCBQUEUED == ret) 710ce1d4d3eSChristoph Hellwig ret = wait_on_sync_kiocb(&iocb); 711ce1d4d3eSChristoph Hellwig return ret; 712ce1d4d3eSChristoph Hellwig } 713ce1d4d3eSChristoph Hellwig 714ce1d4d3eSChristoph Hellwig static ssize_t sock_aio_read(struct kiocb *iocb, char __user *ubuf, 715ce1d4d3eSChristoph Hellwig size_t count, loff_t pos) 716ce1d4d3eSChristoph Hellwig { 717ce1d4d3eSChristoph Hellwig struct sock_iocb siocb, *x; 718ce1d4d3eSChristoph Hellwig 719ce1d4d3eSChristoph Hellwig if (pos != 0) 720ce1d4d3eSChristoph Hellwig return -ESPIPE; 721ce1d4d3eSChristoph Hellwig if (count == 0) /* Match SYS5 behaviour */ 722ce1d4d3eSChristoph Hellwig return 0; 723ce1d4d3eSChristoph Hellwig 724ce1d4d3eSChristoph Hellwig x = alloc_sock_iocb(iocb, ubuf, count, &siocb); 725ce1d4d3eSChristoph Hellwig if (!x) 726ce1d4d3eSChristoph Hellwig return -ENOMEM; 727ce1d4d3eSChristoph Hellwig return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, 728ce1d4d3eSChristoph Hellwig &x->async_iov, 1); 729ce1d4d3eSChristoph Hellwig } 730ce1d4d3eSChristoph Hellwig 731ce1d4d3eSChristoph Hellwig static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb, 732ce1d4d3eSChristoph Hellwig struct file *file, struct iovec *iov, unsigned long nr_segs) 733ce1d4d3eSChristoph Hellwig { 734ce1d4d3eSChristoph Hellwig struct socket *sock = file->private_data; 735ce1d4d3eSChristoph Hellwig size_t size = 0; 736ce1d4d3eSChristoph Hellwig int i; 737ce1d4d3eSChristoph Hellwig 738ce1d4d3eSChristoph Hellwig for (i = 0 ; i < nr_segs ; i++) 739ce1d4d3eSChristoph Hellwig size += iov[i].iov_len; 740ce1d4d3eSChristoph Hellwig 741ce1d4d3eSChristoph Hellwig msg->msg_name = NULL; 742ce1d4d3eSChristoph Hellwig msg->msg_namelen = 0; 743ce1d4d3eSChristoph Hellwig msg->msg_control = NULL; 744ce1d4d3eSChristoph Hellwig msg->msg_controllen = 0; 745ce1d4d3eSChristoph Hellwig msg->msg_iov = (struct iovec *) iov; 746ce1d4d3eSChristoph Hellwig msg->msg_iovlen = nr_segs; 747ce1d4d3eSChristoph Hellwig msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; 748ce1d4d3eSChristoph Hellwig if (sock->type == SOCK_SEQPACKET) 749ce1d4d3eSChristoph Hellwig msg->msg_flags |= MSG_EOR; 750ce1d4d3eSChristoph Hellwig 751ce1d4d3eSChristoph Hellwig return __sock_sendmsg(iocb, sock, msg, size); 752ce1d4d3eSChristoph Hellwig } 753ce1d4d3eSChristoph Hellwig 754ce1d4d3eSChristoph Hellwig static ssize_t sock_writev(struct file *file, const struct iovec *iov, 755ce1d4d3eSChristoph Hellwig unsigned long nr_segs, loff_t *ppos) 7561da177e4SLinus Torvalds { 7571da177e4SLinus Torvalds struct msghdr msg; 758ce1d4d3eSChristoph Hellwig struct kiocb iocb; 759ce1d4d3eSChristoph Hellwig struct sock_iocb siocb; 760ce1d4d3eSChristoph Hellwig int ret; 7611da177e4SLinus Torvalds 762ce1d4d3eSChristoph Hellwig init_sync_kiocb(&iocb, NULL); 763ce1d4d3eSChristoph Hellwig iocb.private = &siocb; 7641da177e4SLinus Torvalds 765ce1d4d3eSChristoph Hellwig ret = do_sock_write(&msg, &iocb, file, (struct iovec *)iov, nr_segs); 766ce1d4d3eSChristoph Hellwig if (-EIOCBQUEUED == ret) 767ce1d4d3eSChristoph Hellwig ret = wait_on_sync_kiocb(&iocb); 768ce1d4d3eSChristoph Hellwig return ret; 7691da177e4SLinus Torvalds } 7701da177e4SLinus Torvalds 771ce1d4d3eSChristoph Hellwig static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *ubuf, 772ce1d4d3eSChristoph Hellwig size_t count, loff_t pos) 7731da177e4SLinus Torvalds { 774ce1d4d3eSChristoph Hellwig struct sock_iocb siocb, *x; 7751da177e4SLinus Torvalds 776ce1d4d3eSChristoph Hellwig if (pos != 0) 777ce1d4d3eSChristoph Hellwig return -ESPIPE; 778ce1d4d3eSChristoph Hellwig if (count == 0) /* Match SYS5 behaviour */ 779ce1d4d3eSChristoph Hellwig return 0; 780ce1d4d3eSChristoph Hellwig 781ce1d4d3eSChristoph Hellwig x = alloc_sock_iocb(iocb, (void __user *)ubuf, count, &siocb); 782ce1d4d3eSChristoph Hellwig if (!x) 783ce1d4d3eSChristoph Hellwig return -ENOMEM; 784ce1d4d3eSChristoph Hellwig 785ce1d4d3eSChristoph Hellwig return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, 786ce1d4d3eSChristoph Hellwig &x->async_iov, 1); 7871da177e4SLinus Torvalds } 7881da177e4SLinus Torvalds 7891da177e4SLinus Torvalds 7901da177e4SLinus Torvalds /* 7911da177e4SLinus Torvalds * Atomic setting of ioctl hooks to avoid race 7921da177e4SLinus Torvalds * with module unload. 7931da177e4SLinus Torvalds */ 7941da177e4SLinus Torvalds 7951da177e4SLinus Torvalds static DECLARE_MUTEX(br_ioctl_mutex); 7961da177e4SLinus Torvalds static int (*br_ioctl_hook)(unsigned int cmd, void __user *arg) = NULL; 7971da177e4SLinus Torvalds 7981da177e4SLinus Torvalds void brioctl_set(int (*hook)(unsigned int, void __user *)) 7991da177e4SLinus Torvalds { 8001da177e4SLinus Torvalds down(&br_ioctl_mutex); 8011da177e4SLinus Torvalds br_ioctl_hook = hook; 8021da177e4SLinus Torvalds up(&br_ioctl_mutex); 8031da177e4SLinus Torvalds } 8041da177e4SLinus Torvalds EXPORT_SYMBOL(brioctl_set); 8051da177e4SLinus Torvalds 8061da177e4SLinus Torvalds static DECLARE_MUTEX(vlan_ioctl_mutex); 8071da177e4SLinus Torvalds static int (*vlan_ioctl_hook)(void __user *arg); 8081da177e4SLinus Torvalds 8091da177e4SLinus Torvalds void vlan_ioctl_set(int (*hook)(void __user *)) 8101da177e4SLinus Torvalds { 8111da177e4SLinus Torvalds down(&vlan_ioctl_mutex); 8121da177e4SLinus Torvalds vlan_ioctl_hook = hook; 8131da177e4SLinus Torvalds up(&vlan_ioctl_mutex); 8141da177e4SLinus Torvalds } 8151da177e4SLinus Torvalds EXPORT_SYMBOL(vlan_ioctl_set); 8161da177e4SLinus Torvalds 8171da177e4SLinus Torvalds static DECLARE_MUTEX(dlci_ioctl_mutex); 8181da177e4SLinus Torvalds static int (*dlci_ioctl_hook)(unsigned int, void __user *); 8191da177e4SLinus Torvalds 8201da177e4SLinus Torvalds void dlci_ioctl_set(int (*hook)(unsigned int, void __user *)) 8211da177e4SLinus Torvalds { 8221da177e4SLinus Torvalds down(&dlci_ioctl_mutex); 8231da177e4SLinus Torvalds dlci_ioctl_hook = hook; 8241da177e4SLinus Torvalds up(&dlci_ioctl_mutex); 8251da177e4SLinus Torvalds } 8261da177e4SLinus Torvalds EXPORT_SYMBOL(dlci_ioctl_set); 8271da177e4SLinus Torvalds 8281da177e4SLinus Torvalds /* 8291da177e4SLinus Torvalds * With an ioctl, arg may well be a user mode pointer, but we don't know 8301da177e4SLinus Torvalds * what to do with it - that's up to the protocol still. 8311da177e4SLinus Torvalds */ 8321da177e4SLinus Torvalds 8331da177e4SLinus Torvalds static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) 8341da177e4SLinus Torvalds { 8351da177e4SLinus Torvalds struct socket *sock; 8361da177e4SLinus Torvalds void __user *argp = (void __user *)arg; 8371da177e4SLinus Torvalds int pid, err; 8381da177e4SLinus Torvalds 839b69aee04SEric Dumazet sock = file->private_data; 8401da177e4SLinus Torvalds if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { 8411da177e4SLinus Torvalds err = dev_ioctl(cmd, argp); 8421da177e4SLinus Torvalds } else 8431da177e4SLinus Torvalds #ifdef WIRELESS_EXT 8441da177e4SLinus Torvalds if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { 8451da177e4SLinus Torvalds err = dev_ioctl(cmd, argp); 8461da177e4SLinus Torvalds } else 8471da177e4SLinus Torvalds #endif /* WIRELESS_EXT */ 8481da177e4SLinus Torvalds switch (cmd) { 8491da177e4SLinus Torvalds case FIOSETOWN: 8501da177e4SLinus Torvalds case SIOCSPGRP: 8511da177e4SLinus Torvalds err = -EFAULT; 8521da177e4SLinus Torvalds if (get_user(pid, (int __user *)argp)) 8531da177e4SLinus Torvalds break; 8541da177e4SLinus Torvalds err = f_setown(sock->file, pid, 1); 8551da177e4SLinus Torvalds break; 8561da177e4SLinus Torvalds case FIOGETOWN: 8571da177e4SLinus Torvalds case SIOCGPGRP: 8581da177e4SLinus Torvalds err = put_user(sock->file->f_owner.pid, (int __user *)argp); 8591da177e4SLinus Torvalds break; 8601da177e4SLinus Torvalds case SIOCGIFBR: 8611da177e4SLinus Torvalds case SIOCSIFBR: 8621da177e4SLinus Torvalds case SIOCBRADDBR: 8631da177e4SLinus Torvalds case SIOCBRDELBR: 8641da177e4SLinus Torvalds err = -ENOPKG; 8651da177e4SLinus Torvalds if (!br_ioctl_hook) 8661da177e4SLinus Torvalds request_module("bridge"); 8671da177e4SLinus Torvalds 8681da177e4SLinus Torvalds down(&br_ioctl_mutex); 8691da177e4SLinus Torvalds if (br_ioctl_hook) 8701da177e4SLinus Torvalds err = br_ioctl_hook(cmd, argp); 8711da177e4SLinus Torvalds up(&br_ioctl_mutex); 8721da177e4SLinus Torvalds break; 8731da177e4SLinus Torvalds case SIOCGIFVLAN: 8741da177e4SLinus Torvalds case SIOCSIFVLAN: 8751da177e4SLinus Torvalds err = -ENOPKG; 8761da177e4SLinus Torvalds if (!vlan_ioctl_hook) 8771da177e4SLinus Torvalds request_module("8021q"); 8781da177e4SLinus Torvalds 8791da177e4SLinus Torvalds down(&vlan_ioctl_mutex); 8801da177e4SLinus Torvalds if (vlan_ioctl_hook) 8811da177e4SLinus Torvalds err = vlan_ioctl_hook(argp); 8821da177e4SLinus Torvalds up(&vlan_ioctl_mutex); 8831da177e4SLinus Torvalds break; 8841da177e4SLinus Torvalds case SIOCGIFDIVERT: 8851da177e4SLinus Torvalds case SIOCSIFDIVERT: 8861da177e4SLinus Torvalds /* Convert this to call through a hook */ 8871da177e4SLinus Torvalds err = divert_ioctl(cmd, argp); 8881da177e4SLinus Torvalds break; 8891da177e4SLinus Torvalds case SIOCADDDLCI: 8901da177e4SLinus Torvalds case SIOCDELDLCI: 8911da177e4SLinus Torvalds err = -ENOPKG; 8921da177e4SLinus Torvalds if (!dlci_ioctl_hook) 8931da177e4SLinus Torvalds request_module("dlci"); 8941da177e4SLinus Torvalds 8951da177e4SLinus Torvalds if (dlci_ioctl_hook) { 8961da177e4SLinus Torvalds down(&dlci_ioctl_mutex); 8971da177e4SLinus Torvalds err = dlci_ioctl_hook(cmd, argp); 8981da177e4SLinus Torvalds up(&dlci_ioctl_mutex); 8991da177e4SLinus Torvalds } 9001da177e4SLinus Torvalds break; 9011da177e4SLinus Torvalds default: 9021da177e4SLinus Torvalds err = sock->ops->ioctl(sock, cmd, arg); 903b5e5fa5eSChristoph Hellwig 904b5e5fa5eSChristoph Hellwig /* 905b5e5fa5eSChristoph Hellwig * If this ioctl is unknown try to hand it down 906b5e5fa5eSChristoph Hellwig * to the NIC driver. 907b5e5fa5eSChristoph Hellwig */ 908b5e5fa5eSChristoph Hellwig if (err == -ENOIOCTLCMD) 909b5e5fa5eSChristoph Hellwig err = dev_ioctl(cmd, argp); 9101da177e4SLinus Torvalds break; 9111da177e4SLinus Torvalds } 9121da177e4SLinus Torvalds return err; 9131da177e4SLinus Torvalds } 9141da177e4SLinus Torvalds 9151da177e4SLinus Torvalds int sock_create_lite(int family, int type, int protocol, struct socket **res) 9161da177e4SLinus Torvalds { 9171da177e4SLinus Torvalds int err; 9181da177e4SLinus Torvalds struct socket *sock = NULL; 9191da177e4SLinus Torvalds 9201da177e4SLinus Torvalds err = security_socket_create(family, type, protocol, 1); 9211da177e4SLinus Torvalds if (err) 9221da177e4SLinus Torvalds goto out; 9231da177e4SLinus Torvalds 9241da177e4SLinus Torvalds sock = sock_alloc(); 9251da177e4SLinus Torvalds if (!sock) { 9261da177e4SLinus Torvalds err = -ENOMEM; 9271da177e4SLinus Torvalds goto out; 9281da177e4SLinus Torvalds } 9291da177e4SLinus Torvalds 9301da177e4SLinus Torvalds security_socket_post_create(sock, family, type, protocol, 1); 9311da177e4SLinus Torvalds sock->type = type; 9321da177e4SLinus Torvalds out: 9331da177e4SLinus Torvalds *res = sock; 9341da177e4SLinus Torvalds return err; 9351da177e4SLinus Torvalds } 9361da177e4SLinus Torvalds 9371da177e4SLinus Torvalds /* No kernel lock held - perfect */ 9381da177e4SLinus Torvalds static unsigned int sock_poll(struct file *file, poll_table * wait) 9391da177e4SLinus Torvalds { 9401da177e4SLinus Torvalds struct socket *sock; 9411da177e4SLinus Torvalds 9421da177e4SLinus Torvalds /* 9431da177e4SLinus Torvalds * We can't return errors to poll, so it's either yes or no. 9441da177e4SLinus Torvalds */ 945b69aee04SEric Dumazet sock = file->private_data; 9461da177e4SLinus Torvalds return sock->ops->poll(file, sock, wait); 9471da177e4SLinus Torvalds } 9481da177e4SLinus Torvalds 9491da177e4SLinus Torvalds static int sock_mmap(struct file * file, struct vm_area_struct * vma) 9501da177e4SLinus Torvalds { 951b69aee04SEric Dumazet struct socket *sock = file->private_data; 9521da177e4SLinus Torvalds 9531da177e4SLinus Torvalds return sock->ops->mmap(file, sock, vma); 9541da177e4SLinus Torvalds } 9551da177e4SLinus Torvalds 95620380731SArnaldo Carvalho de Melo static int sock_close(struct inode *inode, struct file *filp) 9571da177e4SLinus Torvalds { 9581da177e4SLinus Torvalds /* 9591da177e4SLinus Torvalds * It was possible the inode is NULL we were 9601da177e4SLinus Torvalds * closing an unfinished socket. 9611da177e4SLinus Torvalds */ 9621da177e4SLinus Torvalds 9631da177e4SLinus Torvalds if (!inode) 9641da177e4SLinus Torvalds { 9651da177e4SLinus Torvalds printk(KERN_DEBUG "sock_close: NULL inode\n"); 9661da177e4SLinus Torvalds return 0; 9671da177e4SLinus Torvalds } 9681da177e4SLinus Torvalds sock_fasync(-1, filp, 0); 9691da177e4SLinus Torvalds sock_release(SOCKET_I(inode)); 9701da177e4SLinus Torvalds return 0; 9711da177e4SLinus Torvalds } 9721da177e4SLinus Torvalds 9731da177e4SLinus Torvalds /* 9741da177e4SLinus Torvalds * Update the socket async list 9751da177e4SLinus Torvalds * 9761da177e4SLinus Torvalds * Fasync_list locking strategy. 9771da177e4SLinus Torvalds * 9781da177e4SLinus Torvalds * 1. fasync_list is modified only under process context socket lock 9791da177e4SLinus Torvalds * i.e. under semaphore. 9801da177e4SLinus Torvalds * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) 9811da177e4SLinus Torvalds * or under socket lock. 9821da177e4SLinus Torvalds * 3. fasync_list can be used from softirq context, so that 9831da177e4SLinus Torvalds * modification under socket lock have to be enhanced with 9841da177e4SLinus Torvalds * write_lock_bh(&sk->sk_callback_lock). 9851da177e4SLinus Torvalds * --ANK (990710) 9861da177e4SLinus Torvalds */ 9871da177e4SLinus Torvalds 9881da177e4SLinus Torvalds static int sock_fasync(int fd, struct file *filp, int on) 9891da177e4SLinus Torvalds { 9901da177e4SLinus Torvalds struct fasync_struct *fa, *fna=NULL, **prev; 9911da177e4SLinus Torvalds struct socket *sock; 9921da177e4SLinus Torvalds struct sock *sk; 9931da177e4SLinus Torvalds 9941da177e4SLinus Torvalds if (on) 9951da177e4SLinus Torvalds { 9968b3a7005SKris Katterjohn fna = kmalloc(sizeof(struct fasync_struct), GFP_KERNEL); 9971da177e4SLinus Torvalds if(fna==NULL) 9981da177e4SLinus Torvalds return -ENOMEM; 9991da177e4SLinus Torvalds } 10001da177e4SLinus Torvalds 1001b69aee04SEric Dumazet sock = filp->private_data; 10021da177e4SLinus Torvalds 10031da177e4SLinus Torvalds if ((sk=sock->sk) == NULL) { 10041da177e4SLinus Torvalds kfree(fna); 10051da177e4SLinus Torvalds return -EINVAL; 10061da177e4SLinus Torvalds } 10071da177e4SLinus Torvalds 10081da177e4SLinus Torvalds lock_sock(sk); 10091da177e4SLinus Torvalds 10101da177e4SLinus Torvalds prev=&(sock->fasync_list); 10111da177e4SLinus Torvalds 10121da177e4SLinus Torvalds for (fa=*prev; fa!=NULL; prev=&fa->fa_next,fa=*prev) 10131da177e4SLinus Torvalds if (fa->fa_file==filp) 10141da177e4SLinus Torvalds break; 10151da177e4SLinus Torvalds 10161da177e4SLinus Torvalds if(on) 10171da177e4SLinus Torvalds { 10181da177e4SLinus Torvalds if(fa!=NULL) 10191da177e4SLinus Torvalds { 10201da177e4SLinus Torvalds write_lock_bh(&sk->sk_callback_lock); 10211da177e4SLinus Torvalds fa->fa_fd=fd; 10221da177e4SLinus Torvalds write_unlock_bh(&sk->sk_callback_lock); 10231da177e4SLinus Torvalds 10241da177e4SLinus Torvalds kfree(fna); 10251da177e4SLinus Torvalds goto out; 10261da177e4SLinus Torvalds } 10271da177e4SLinus Torvalds fna->fa_file=filp; 10281da177e4SLinus Torvalds fna->fa_fd=fd; 10291da177e4SLinus Torvalds fna->magic=FASYNC_MAGIC; 10301da177e4SLinus Torvalds fna->fa_next=sock->fasync_list; 10311da177e4SLinus Torvalds write_lock_bh(&sk->sk_callback_lock); 10321da177e4SLinus Torvalds sock->fasync_list=fna; 10331da177e4SLinus Torvalds write_unlock_bh(&sk->sk_callback_lock); 10341da177e4SLinus Torvalds } 10351da177e4SLinus Torvalds else 10361da177e4SLinus Torvalds { 10371da177e4SLinus Torvalds if (fa!=NULL) 10381da177e4SLinus Torvalds { 10391da177e4SLinus Torvalds write_lock_bh(&sk->sk_callback_lock); 10401da177e4SLinus Torvalds *prev=fa->fa_next; 10411da177e4SLinus Torvalds write_unlock_bh(&sk->sk_callback_lock); 10421da177e4SLinus Torvalds kfree(fa); 10431da177e4SLinus Torvalds } 10441da177e4SLinus Torvalds } 10451da177e4SLinus Torvalds 10461da177e4SLinus Torvalds out: 10471da177e4SLinus Torvalds release_sock(sock->sk); 10481da177e4SLinus Torvalds return 0; 10491da177e4SLinus Torvalds } 10501da177e4SLinus Torvalds 10511da177e4SLinus Torvalds /* This function may be called only under socket lock or callback_lock */ 10521da177e4SLinus Torvalds 10531da177e4SLinus Torvalds int sock_wake_async(struct socket *sock, int how, int band) 10541da177e4SLinus Torvalds { 10551da177e4SLinus Torvalds if (!sock || !sock->fasync_list) 10561da177e4SLinus Torvalds return -1; 10571da177e4SLinus Torvalds switch (how) 10581da177e4SLinus Torvalds { 10591da177e4SLinus Torvalds case 1: 10601da177e4SLinus Torvalds 10611da177e4SLinus Torvalds if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags)) 10621da177e4SLinus Torvalds break; 10631da177e4SLinus Torvalds goto call_kill; 10641da177e4SLinus Torvalds case 2: 10651da177e4SLinus Torvalds if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags)) 10661da177e4SLinus Torvalds break; 10671da177e4SLinus Torvalds /* fall through */ 10681da177e4SLinus Torvalds case 0: 10691da177e4SLinus Torvalds call_kill: 10701da177e4SLinus Torvalds __kill_fasync(sock->fasync_list, SIGIO, band); 10711da177e4SLinus Torvalds break; 10721da177e4SLinus Torvalds case 3: 10731da177e4SLinus Torvalds __kill_fasync(sock->fasync_list, SIGURG, band); 10741da177e4SLinus Torvalds } 10751da177e4SLinus Torvalds return 0; 10761da177e4SLinus Torvalds } 10771da177e4SLinus Torvalds 10781da177e4SLinus Torvalds static int __sock_create(int family, int type, int protocol, struct socket **res, int kern) 10791da177e4SLinus Torvalds { 10801da177e4SLinus Torvalds int err; 10811da177e4SLinus Torvalds struct socket *sock; 10821da177e4SLinus Torvalds 10831da177e4SLinus Torvalds /* 10841da177e4SLinus Torvalds * Check protocol is in range 10851da177e4SLinus Torvalds */ 10861da177e4SLinus Torvalds if (family < 0 || family >= NPROTO) 10871da177e4SLinus Torvalds return -EAFNOSUPPORT; 10881da177e4SLinus Torvalds if (type < 0 || type >= SOCK_MAX) 10891da177e4SLinus Torvalds return -EINVAL; 10901da177e4SLinus Torvalds 10911da177e4SLinus Torvalds /* Compatibility. 10921da177e4SLinus Torvalds 10931da177e4SLinus Torvalds This uglymoron is moved from INET layer to here to avoid 10941da177e4SLinus Torvalds deadlock in module load. 10951da177e4SLinus Torvalds */ 10961da177e4SLinus Torvalds if (family == PF_INET && type == SOCK_PACKET) { 10971da177e4SLinus Torvalds static int warned; 10981da177e4SLinus Torvalds if (!warned) { 10991da177e4SLinus Torvalds warned = 1; 11001da177e4SLinus Torvalds printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n", current->comm); 11011da177e4SLinus Torvalds } 11021da177e4SLinus Torvalds family = PF_PACKET; 11031da177e4SLinus Torvalds } 11041da177e4SLinus Torvalds 11051da177e4SLinus Torvalds err = security_socket_create(family, type, protocol, kern); 11061da177e4SLinus Torvalds if (err) 11071da177e4SLinus Torvalds return err; 11081da177e4SLinus Torvalds 11091da177e4SLinus Torvalds #if defined(CONFIG_KMOD) 11101da177e4SLinus Torvalds /* Attempt to load a protocol module if the find failed. 11111da177e4SLinus Torvalds * 11121da177e4SLinus Torvalds * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user 11131da177e4SLinus Torvalds * requested real, full-featured networking support upon configuration. 11141da177e4SLinus Torvalds * Otherwise module support will break! 11151da177e4SLinus Torvalds */ 11161da177e4SLinus Torvalds if (net_families[family]==NULL) 11171da177e4SLinus Torvalds { 11181da177e4SLinus Torvalds request_module("net-pf-%d",family); 11191da177e4SLinus Torvalds } 11201da177e4SLinus Torvalds #endif 11211da177e4SLinus Torvalds 11221da177e4SLinus Torvalds net_family_read_lock(); 11231da177e4SLinus Torvalds if (net_families[family] == NULL) { 11241da177e4SLinus Torvalds err = -EAFNOSUPPORT; 11251da177e4SLinus Torvalds goto out; 11261da177e4SLinus Torvalds } 11271da177e4SLinus Torvalds 11281da177e4SLinus Torvalds /* 11291da177e4SLinus Torvalds * Allocate the socket and allow the family to set things up. if 11301da177e4SLinus Torvalds * the protocol is 0, the family is instructed to select an appropriate 11311da177e4SLinus Torvalds * default. 11321da177e4SLinus Torvalds */ 11331da177e4SLinus Torvalds 11341da177e4SLinus Torvalds if (!(sock = sock_alloc())) { 11351da177e4SLinus Torvalds printk(KERN_WARNING "socket: no more sockets\n"); 11361da177e4SLinus Torvalds err = -ENFILE; /* Not exactly a match, but its the 11371da177e4SLinus Torvalds closest posix thing */ 11381da177e4SLinus Torvalds goto out; 11391da177e4SLinus Torvalds } 11401da177e4SLinus Torvalds 11411da177e4SLinus Torvalds sock->type = type; 11421da177e4SLinus Torvalds 11431da177e4SLinus Torvalds /* 11441da177e4SLinus Torvalds * We will call the ->create function, that possibly is in a loadable 11451da177e4SLinus Torvalds * module, so we have to bump that loadable module refcnt first. 11461da177e4SLinus Torvalds */ 11471da177e4SLinus Torvalds err = -EAFNOSUPPORT; 11481da177e4SLinus Torvalds if (!try_module_get(net_families[family]->owner)) 11491da177e4SLinus Torvalds goto out_release; 11501da177e4SLinus Torvalds 1151a79af59eSFrank Filz if ((err = net_families[family]->create(sock, protocol)) < 0) { 1152a79af59eSFrank Filz sock->ops = NULL; 11531da177e4SLinus Torvalds goto out_module_put; 1154a79af59eSFrank Filz } 1155a79af59eSFrank Filz 11561da177e4SLinus Torvalds /* 11571da177e4SLinus Torvalds * Now to bump the refcnt of the [loadable] module that owns this 11581da177e4SLinus Torvalds * socket at sock_release time we decrement its refcnt. 11591da177e4SLinus Torvalds */ 11601da177e4SLinus Torvalds if (!try_module_get(sock->ops->owner)) { 11611da177e4SLinus Torvalds sock->ops = NULL; 11621da177e4SLinus Torvalds goto out_module_put; 11631da177e4SLinus Torvalds } 11641da177e4SLinus Torvalds /* 11651da177e4SLinus Torvalds * Now that we're done with the ->create function, the [loadable] 11661da177e4SLinus Torvalds * module can have its refcnt decremented 11671da177e4SLinus Torvalds */ 11681da177e4SLinus Torvalds module_put(net_families[family]->owner); 11691da177e4SLinus Torvalds *res = sock; 11701da177e4SLinus Torvalds security_socket_post_create(sock, family, type, protocol, kern); 11711da177e4SLinus Torvalds 11721da177e4SLinus Torvalds out: 11731da177e4SLinus Torvalds net_family_read_unlock(); 11741da177e4SLinus Torvalds return err; 11751da177e4SLinus Torvalds out_module_put: 11761da177e4SLinus Torvalds module_put(net_families[family]->owner); 11771da177e4SLinus Torvalds out_release: 11781da177e4SLinus Torvalds sock_release(sock); 11791da177e4SLinus Torvalds goto out; 11801da177e4SLinus Torvalds } 11811da177e4SLinus Torvalds 11821da177e4SLinus Torvalds int sock_create(int family, int type, int protocol, struct socket **res) 11831da177e4SLinus Torvalds { 11841da177e4SLinus Torvalds return __sock_create(family, type, protocol, res, 0); 11851da177e4SLinus Torvalds } 11861da177e4SLinus Torvalds 11871da177e4SLinus Torvalds int sock_create_kern(int family, int type, int protocol, struct socket **res) 11881da177e4SLinus Torvalds { 11891da177e4SLinus Torvalds return __sock_create(family, type, protocol, res, 1); 11901da177e4SLinus Torvalds } 11911da177e4SLinus Torvalds 11921da177e4SLinus Torvalds asmlinkage long sys_socket(int family, int type, int protocol) 11931da177e4SLinus Torvalds { 11941da177e4SLinus Torvalds int retval; 11951da177e4SLinus Torvalds struct socket *sock; 11961da177e4SLinus Torvalds 11971da177e4SLinus Torvalds retval = sock_create(family, type, protocol, &sock); 11981da177e4SLinus Torvalds if (retval < 0) 11991da177e4SLinus Torvalds goto out; 12001da177e4SLinus Torvalds 12011da177e4SLinus Torvalds retval = sock_map_fd(sock); 12021da177e4SLinus Torvalds if (retval < 0) 12031da177e4SLinus Torvalds goto out_release; 12041da177e4SLinus Torvalds 12051da177e4SLinus Torvalds out: 12061da177e4SLinus Torvalds /* It may be already another descriptor 8) Not kernel problem. */ 12071da177e4SLinus Torvalds return retval; 12081da177e4SLinus Torvalds 12091da177e4SLinus Torvalds out_release: 12101da177e4SLinus Torvalds sock_release(sock); 12111da177e4SLinus Torvalds return retval; 12121da177e4SLinus Torvalds } 12131da177e4SLinus Torvalds 12141da177e4SLinus Torvalds /* 12151da177e4SLinus Torvalds * Create a pair of connected sockets. 12161da177e4SLinus Torvalds */ 12171da177e4SLinus Torvalds 12181da177e4SLinus Torvalds asmlinkage long sys_socketpair(int family, int type, int protocol, int __user *usockvec) 12191da177e4SLinus Torvalds { 12201da177e4SLinus Torvalds struct socket *sock1, *sock2; 12211da177e4SLinus Torvalds int fd1, fd2, err; 12221da177e4SLinus Torvalds 12231da177e4SLinus Torvalds /* 12241da177e4SLinus Torvalds * Obtain the first socket and check if the underlying protocol 12251da177e4SLinus Torvalds * supports the socketpair call. 12261da177e4SLinus Torvalds */ 12271da177e4SLinus Torvalds 12281da177e4SLinus Torvalds err = sock_create(family, type, protocol, &sock1); 12291da177e4SLinus Torvalds if (err < 0) 12301da177e4SLinus Torvalds goto out; 12311da177e4SLinus Torvalds 12321da177e4SLinus Torvalds err = sock_create(family, type, protocol, &sock2); 12331da177e4SLinus Torvalds if (err < 0) 12341da177e4SLinus Torvalds goto out_release_1; 12351da177e4SLinus Torvalds 12361da177e4SLinus Torvalds err = sock1->ops->socketpair(sock1, sock2); 12371da177e4SLinus Torvalds if (err < 0) 12381da177e4SLinus Torvalds goto out_release_both; 12391da177e4SLinus Torvalds 12401da177e4SLinus Torvalds fd1 = fd2 = -1; 12411da177e4SLinus Torvalds 12421da177e4SLinus Torvalds err = sock_map_fd(sock1); 12431da177e4SLinus Torvalds if (err < 0) 12441da177e4SLinus Torvalds goto out_release_both; 12451da177e4SLinus Torvalds fd1 = err; 12461da177e4SLinus Torvalds 12471da177e4SLinus Torvalds err = sock_map_fd(sock2); 12481da177e4SLinus Torvalds if (err < 0) 12491da177e4SLinus Torvalds goto out_close_1; 12501da177e4SLinus Torvalds fd2 = err; 12511da177e4SLinus Torvalds 12521da177e4SLinus Torvalds /* fd1 and fd2 may be already another descriptors. 12531da177e4SLinus Torvalds * Not kernel problem. 12541da177e4SLinus Torvalds */ 12551da177e4SLinus Torvalds 12561da177e4SLinus Torvalds err = put_user(fd1, &usockvec[0]); 12571da177e4SLinus Torvalds if (!err) 12581da177e4SLinus Torvalds err = put_user(fd2, &usockvec[1]); 12591da177e4SLinus Torvalds if (!err) 12601da177e4SLinus Torvalds return 0; 12611da177e4SLinus Torvalds 12621da177e4SLinus Torvalds sys_close(fd2); 12631da177e4SLinus Torvalds sys_close(fd1); 12641da177e4SLinus Torvalds return err; 12651da177e4SLinus Torvalds 12661da177e4SLinus Torvalds out_close_1: 12671da177e4SLinus Torvalds sock_release(sock2); 12681da177e4SLinus Torvalds sys_close(fd1); 12691da177e4SLinus Torvalds return err; 12701da177e4SLinus Torvalds 12711da177e4SLinus Torvalds out_release_both: 12721da177e4SLinus Torvalds sock_release(sock2); 12731da177e4SLinus Torvalds out_release_1: 12741da177e4SLinus Torvalds sock_release(sock1); 12751da177e4SLinus Torvalds out: 12761da177e4SLinus Torvalds return err; 12771da177e4SLinus Torvalds } 12781da177e4SLinus Torvalds 12791da177e4SLinus Torvalds 12801da177e4SLinus Torvalds /* 12811da177e4SLinus Torvalds * Bind a name to a socket. Nothing much to do here since it's 12821da177e4SLinus Torvalds * the protocol's responsibility to handle the local address. 12831da177e4SLinus Torvalds * 12841da177e4SLinus Torvalds * We move the socket address to kernel space before we call 12851da177e4SLinus Torvalds * the protocol layer (having also checked the address is ok). 12861da177e4SLinus Torvalds */ 12871da177e4SLinus Torvalds 12881da177e4SLinus Torvalds asmlinkage long sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) 12891da177e4SLinus Torvalds { 12901da177e4SLinus Torvalds struct socket *sock; 12911da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 12921da177e4SLinus Torvalds int err; 12931da177e4SLinus Torvalds 12941da177e4SLinus Torvalds if((sock = sockfd_lookup(fd,&err))!=NULL) 12951da177e4SLinus Torvalds { 12961da177e4SLinus Torvalds if((err=move_addr_to_kernel(umyaddr,addrlen,address))>=0) { 12971da177e4SLinus Torvalds err = security_socket_bind(sock, (struct sockaddr *)address, addrlen); 12981da177e4SLinus Torvalds if (err) { 12991da177e4SLinus Torvalds sockfd_put(sock); 13001da177e4SLinus Torvalds return err; 13011da177e4SLinus Torvalds } 13021da177e4SLinus Torvalds err = sock->ops->bind(sock, (struct sockaddr *)address, addrlen); 13031da177e4SLinus Torvalds } 13041da177e4SLinus Torvalds sockfd_put(sock); 13051da177e4SLinus Torvalds } 13061da177e4SLinus Torvalds return err; 13071da177e4SLinus Torvalds } 13081da177e4SLinus Torvalds 13091da177e4SLinus Torvalds 13101da177e4SLinus Torvalds /* 13111da177e4SLinus Torvalds * Perform a listen. Basically, we allow the protocol to do anything 13121da177e4SLinus Torvalds * necessary for a listen, and if that works, we mark the socket as 13131da177e4SLinus Torvalds * ready for listening. 13141da177e4SLinus Torvalds */ 13151da177e4SLinus Torvalds 13161da177e4SLinus Torvalds int sysctl_somaxconn = SOMAXCONN; 13171da177e4SLinus Torvalds 13181da177e4SLinus Torvalds asmlinkage long sys_listen(int fd, int backlog) 13191da177e4SLinus Torvalds { 13201da177e4SLinus Torvalds struct socket *sock; 13211da177e4SLinus Torvalds int err; 13221da177e4SLinus Torvalds 13231da177e4SLinus Torvalds if ((sock = sockfd_lookup(fd, &err)) != NULL) { 13241da177e4SLinus Torvalds if ((unsigned) backlog > sysctl_somaxconn) 13251da177e4SLinus Torvalds backlog = sysctl_somaxconn; 13261da177e4SLinus Torvalds 13271da177e4SLinus Torvalds err = security_socket_listen(sock, backlog); 13281da177e4SLinus Torvalds if (err) { 13291da177e4SLinus Torvalds sockfd_put(sock); 13301da177e4SLinus Torvalds return err; 13311da177e4SLinus Torvalds } 13321da177e4SLinus Torvalds 13331da177e4SLinus Torvalds err=sock->ops->listen(sock, backlog); 13341da177e4SLinus Torvalds sockfd_put(sock); 13351da177e4SLinus Torvalds } 13361da177e4SLinus Torvalds return err; 13371da177e4SLinus Torvalds } 13381da177e4SLinus Torvalds 13391da177e4SLinus Torvalds 13401da177e4SLinus Torvalds /* 13411da177e4SLinus Torvalds * For accept, we attempt to create a new socket, set up the link 13421da177e4SLinus Torvalds * with the client, wake up the client, then return the new 13431da177e4SLinus Torvalds * connected fd. We collect the address of the connector in kernel 13441da177e4SLinus Torvalds * space and move it to user at the very end. This is unclean because 13451da177e4SLinus Torvalds * we open the socket then return an error. 13461da177e4SLinus Torvalds * 13471da177e4SLinus Torvalds * 1003.1g adds the ability to recvmsg() to query connection pending 13481da177e4SLinus Torvalds * status to recvmsg. We need to add that support in a way thats 13491da177e4SLinus Torvalds * clean when we restucture accept also. 13501da177e4SLinus Torvalds */ 13511da177e4SLinus Torvalds 13521da177e4SLinus Torvalds asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr, int __user *upeer_addrlen) 13531da177e4SLinus Torvalds { 13541da177e4SLinus Torvalds struct socket *sock, *newsock; 13551da177e4SLinus Torvalds int err, len; 13561da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 13571da177e4SLinus Torvalds 13581da177e4SLinus Torvalds sock = sockfd_lookup(fd, &err); 13591da177e4SLinus Torvalds if (!sock) 13601da177e4SLinus Torvalds goto out; 13611da177e4SLinus Torvalds 13621da177e4SLinus Torvalds err = -ENFILE; 13631da177e4SLinus Torvalds if (!(newsock = sock_alloc())) 13641da177e4SLinus Torvalds goto out_put; 13651da177e4SLinus Torvalds 13661da177e4SLinus Torvalds newsock->type = sock->type; 13671da177e4SLinus Torvalds newsock->ops = sock->ops; 13681da177e4SLinus Torvalds 13691da177e4SLinus Torvalds /* 13701da177e4SLinus Torvalds * We don't need try_module_get here, as the listening socket (sock) 13711da177e4SLinus Torvalds * has the protocol module (sock->ops->owner) held. 13721da177e4SLinus Torvalds */ 13731da177e4SLinus Torvalds __module_get(newsock->ops->owner); 13741da177e4SLinus Torvalds 1375a79af59eSFrank Filz err = security_socket_accept(sock, newsock); 1376a79af59eSFrank Filz if (err) 1377a79af59eSFrank Filz goto out_release; 1378a79af59eSFrank Filz 13791da177e4SLinus Torvalds err = sock->ops->accept(sock, newsock, sock->file->f_flags); 13801da177e4SLinus Torvalds if (err < 0) 13811da177e4SLinus Torvalds goto out_release; 13821da177e4SLinus Torvalds 13831da177e4SLinus Torvalds if (upeer_sockaddr) { 13841da177e4SLinus Torvalds if(newsock->ops->getname(newsock, (struct sockaddr *)address, &len, 2)<0) { 13851da177e4SLinus Torvalds err = -ECONNABORTED; 13861da177e4SLinus Torvalds goto out_release; 13871da177e4SLinus Torvalds } 13881da177e4SLinus Torvalds err = move_addr_to_user(address, len, upeer_sockaddr, upeer_addrlen); 13891da177e4SLinus Torvalds if (err < 0) 13901da177e4SLinus Torvalds goto out_release; 13911da177e4SLinus Torvalds } 13921da177e4SLinus Torvalds 13931da177e4SLinus Torvalds /* File flags are not inherited via accept() unlike another OSes. */ 13941da177e4SLinus Torvalds 13951da177e4SLinus Torvalds if ((err = sock_map_fd(newsock)) < 0) 13961da177e4SLinus Torvalds goto out_release; 13971da177e4SLinus Torvalds 13981da177e4SLinus Torvalds security_socket_post_accept(sock, newsock); 13991da177e4SLinus Torvalds 14001da177e4SLinus Torvalds out_put: 14011da177e4SLinus Torvalds sockfd_put(sock); 14021da177e4SLinus Torvalds out: 14031da177e4SLinus Torvalds return err; 14041da177e4SLinus Torvalds out_release: 14051da177e4SLinus Torvalds sock_release(newsock); 14061da177e4SLinus Torvalds goto out_put; 14071da177e4SLinus Torvalds } 14081da177e4SLinus Torvalds 14091da177e4SLinus Torvalds 14101da177e4SLinus Torvalds /* 14111da177e4SLinus Torvalds * Attempt to connect to a socket with the server address. The address 14121da177e4SLinus Torvalds * is in user space so we verify it is OK and move it to kernel space. 14131da177e4SLinus Torvalds * 14141da177e4SLinus Torvalds * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to 14151da177e4SLinus Torvalds * break bindings 14161da177e4SLinus Torvalds * 14171da177e4SLinus Torvalds * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and 14181da177e4SLinus Torvalds * other SEQPACKET protocols that take time to connect() as it doesn't 14191da177e4SLinus Torvalds * include the -EINPROGRESS status for such sockets. 14201da177e4SLinus Torvalds */ 14211da177e4SLinus Torvalds 14221da177e4SLinus Torvalds asmlinkage long sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen) 14231da177e4SLinus Torvalds { 14241da177e4SLinus Torvalds struct socket *sock; 14251da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 14261da177e4SLinus Torvalds int err; 14271da177e4SLinus Torvalds 14281da177e4SLinus Torvalds sock = sockfd_lookup(fd, &err); 14291da177e4SLinus Torvalds if (!sock) 14301da177e4SLinus Torvalds goto out; 14311da177e4SLinus Torvalds err = move_addr_to_kernel(uservaddr, addrlen, address); 14321da177e4SLinus Torvalds if (err < 0) 14331da177e4SLinus Torvalds goto out_put; 14341da177e4SLinus Torvalds 14351da177e4SLinus Torvalds err = security_socket_connect(sock, (struct sockaddr *)address, addrlen); 14361da177e4SLinus Torvalds if (err) 14371da177e4SLinus Torvalds goto out_put; 14381da177e4SLinus Torvalds 14391da177e4SLinus Torvalds err = sock->ops->connect(sock, (struct sockaddr *) address, addrlen, 14401da177e4SLinus Torvalds sock->file->f_flags); 14411da177e4SLinus Torvalds out_put: 14421da177e4SLinus Torvalds sockfd_put(sock); 14431da177e4SLinus Torvalds out: 14441da177e4SLinus Torvalds return err; 14451da177e4SLinus Torvalds } 14461da177e4SLinus Torvalds 14471da177e4SLinus Torvalds /* 14481da177e4SLinus Torvalds * Get the local address ('name') of a socket object. Move the obtained 14491da177e4SLinus Torvalds * name to user space. 14501da177e4SLinus Torvalds */ 14511da177e4SLinus Torvalds 14521da177e4SLinus Torvalds asmlinkage long sys_getsockname(int fd, struct sockaddr __user *usockaddr, int __user *usockaddr_len) 14531da177e4SLinus Torvalds { 14541da177e4SLinus Torvalds struct socket *sock; 14551da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 14561da177e4SLinus Torvalds int len, err; 14571da177e4SLinus Torvalds 14581da177e4SLinus Torvalds sock = sockfd_lookup(fd, &err); 14591da177e4SLinus Torvalds if (!sock) 14601da177e4SLinus Torvalds goto out; 14611da177e4SLinus Torvalds 14621da177e4SLinus Torvalds err = security_socket_getsockname(sock); 14631da177e4SLinus Torvalds if (err) 14641da177e4SLinus Torvalds goto out_put; 14651da177e4SLinus Torvalds 14661da177e4SLinus Torvalds err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 0); 14671da177e4SLinus Torvalds if (err) 14681da177e4SLinus Torvalds goto out_put; 14691da177e4SLinus Torvalds err = move_addr_to_user(address, len, usockaddr, usockaddr_len); 14701da177e4SLinus Torvalds 14711da177e4SLinus Torvalds out_put: 14721da177e4SLinus Torvalds sockfd_put(sock); 14731da177e4SLinus Torvalds out: 14741da177e4SLinus Torvalds return err; 14751da177e4SLinus Torvalds } 14761da177e4SLinus Torvalds 14771da177e4SLinus Torvalds /* 14781da177e4SLinus Torvalds * Get the remote address ('name') of a socket object. Move the obtained 14791da177e4SLinus Torvalds * name to user space. 14801da177e4SLinus Torvalds */ 14811da177e4SLinus Torvalds 14821da177e4SLinus Torvalds asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr, int __user *usockaddr_len) 14831da177e4SLinus Torvalds { 14841da177e4SLinus Torvalds struct socket *sock; 14851da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 14861da177e4SLinus Torvalds int len, err; 14871da177e4SLinus Torvalds 14881da177e4SLinus Torvalds if ((sock = sockfd_lookup(fd, &err))!=NULL) 14891da177e4SLinus Torvalds { 14901da177e4SLinus Torvalds err = security_socket_getpeername(sock); 14911da177e4SLinus Torvalds if (err) { 14921da177e4SLinus Torvalds sockfd_put(sock); 14931da177e4SLinus Torvalds return err; 14941da177e4SLinus Torvalds } 14951da177e4SLinus Torvalds 14961da177e4SLinus Torvalds err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 1); 14971da177e4SLinus Torvalds if (!err) 14981da177e4SLinus Torvalds err=move_addr_to_user(address,len, usockaddr, usockaddr_len); 14991da177e4SLinus Torvalds sockfd_put(sock); 15001da177e4SLinus Torvalds } 15011da177e4SLinus Torvalds return err; 15021da177e4SLinus Torvalds } 15031da177e4SLinus Torvalds 15041da177e4SLinus Torvalds /* 15051da177e4SLinus Torvalds * Send a datagram to a given address. We move the address into kernel 15061da177e4SLinus Torvalds * space and check the user space data area is readable before invoking 15071da177e4SLinus Torvalds * the protocol. 15081da177e4SLinus Torvalds */ 15091da177e4SLinus Torvalds 15101da177e4SLinus Torvalds asmlinkage long sys_sendto(int fd, void __user * buff, size_t len, unsigned flags, 15111da177e4SLinus Torvalds struct sockaddr __user *addr, int addr_len) 15121da177e4SLinus Torvalds { 15131da177e4SLinus Torvalds struct socket *sock; 15141da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 15151da177e4SLinus Torvalds int err; 15161da177e4SLinus Torvalds struct msghdr msg; 15171da177e4SLinus Torvalds struct iovec iov; 15181da177e4SLinus Torvalds 15191da177e4SLinus Torvalds sock = sockfd_lookup(fd, &err); 15201da177e4SLinus Torvalds if (!sock) 15211da177e4SLinus Torvalds goto out; 15221da177e4SLinus Torvalds iov.iov_base=buff; 15231da177e4SLinus Torvalds iov.iov_len=len; 15241da177e4SLinus Torvalds msg.msg_name=NULL; 15251da177e4SLinus Torvalds msg.msg_iov=&iov; 15261da177e4SLinus Torvalds msg.msg_iovlen=1; 15271da177e4SLinus Torvalds msg.msg_control=NULL; 15281da177e4SLinus Torvalds msg.msg_controllen=0; 15291da177e4SLinus Torvalds msg.msg_namelen=0; 15301da177e4SLinus Torvalds if(addr) 15311da177e4SLinus Torvalds { 15321da177e4SLinus Torvalds err = move_addr_to_kernel(addr, addr_len, address); 15331da177e4SLinus Torvalds if (err < 0) 15341da177e4SLinus Torvalds goto out_put; 15351da177e4SLinus Torvalds msg.msg_name=address; 15361da177e4SLinus Torvalds msg.msg_namelen=addr_len; 15371da177e4SLinus Torvalds } 15381da177e4SLinus Torvalds if (sock->file->f_flags & O_NONBLOCK) 15391da177e4SLinus Torvalds flags |= MSG_DONTWAIT; 15401da177e4SLinus Torvalds msg.msg_flags = flags; 15411da177e4SLinus Torvalds err = sock_sendmsg(sock, &msg, len); 15421da177e4SLinus Torvalds 15431da177e4SLinus Torvalds out_put: 15441da177e4SLinus Torvalds sockfd_put(sock); 15451da177e4SLinus Torvalds out: 15461da177e4SLinus Torvalds return err; 15471da177e4SLinus Torvalds } 15481da177e4SLinus Torvalds 15491da177e4SLinus Torvalds /* 15501da177e4SLinus Torvalds * Send a datagram down a socket. 15511da177e4SLinus Torvalds */ 15521da177e4SLinus Torvalds 15531da177e4SLinus Torvalds asmlinkage long sys_send(int fd, void __user * buff, size_t len, unsigned flags) 15541da177e4SLinus Torvalds { 15551da177e4SLinus Torvalds return sys_sendto(fd, buff, len, flags, NULL, 0); 15561da177e4SLinus Torvalds } 15571da177e4SLinus Torvalds 15581da177e4SLinus Torvalds /* 15591da177e4SLinus Torvalds * Receive a frame from the socket and optionally record the address of the 15601da177e4SLinus Torvalds * sender. We verify the buffers are writable and if needed move the 15611da177e4SLinus Torvalds * sender address from kernel to user space. 15621da177e4SLinus Torvalds */ 15631da177e4SLinus Torvalds 15641da177e4SLinus Torvalds asmlinkage long sys_recvfrom(int fd, void __user * ubuf, size_t size, unsigned flags, 15651da177e4SLinus Torvalds struct sockaddr __user *addr, int __user *addr_len) 15661da177e4SLinus Torvalds { 15671da177e4SLinus Torvalds struct socket *sock; 15681da177e4SLinus Torvalds struct iovec iov; 15691da177e4SLinus Torvalds struct msghdr msg; 15701da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 15711da177e4SLinus Torvalds int err,err2; 15721da177e4SLinus Torvalds 15731da177e4SLinus Torvalds sock = sockfd_lookup(fd, &err); 15741da177e4SLinus Torvalds if (!sock) 15751da177e4SLinus Torvalds goto out; 15761da177e4SLinus Torvalds 15771da177e4SLinus Torvalds msg.msg_control=NULL; 15781da177e4SLinus Torvalds msg.msg_controllen=0; 15791da177e4SLinus Torvalds msg.msg_iovlen=1; 15801da177e4SLinus Torvalds msg.msg_iov=&iov; 15811da177e4SLinus Torvalds iov.iov_len=size; 15821da177e4SLinus Torvalds iov.iov_base=ubuf; 15831da177e4SLinus Torvalds msg.msg_name=address; 15841da177e4SLinus Torvalds msg.msg_namelen=MAX_SOCK_ADDR; 15851da177e4SLinus Torvalds if (sock->file->f_flags & O_NONBLOCK) 15861da177e4SLinus Torvalds flags |= MSG_DONTWAIT; 15871da177e4SLinus Torvalds err=sock_recvmsg(sock, &msg, size, flags); 15881da177e4SLinus Torvalds 15891da177e4SLinus Torvalds if(err >= 0 && addr != NULL) 15901da177e4SLinus Torvalds { 15911da177e4SLinus Torvalds err2=move_addr_to_user(address, msg.msg_namelen, addr, addr_len); 15921da177e4SLinus Torvalds if(err2<0) 15931da177e4SLinus Torvalds err=err2; 15941da177e4SLinus Torvalds } 15951da177e4SLinus Torvalds sockfd_put(sock); 15961da177e4SLinus Torvalds out: 15971da177e4SLinus Torvalds return err; 15981da177e4SLinus Torvalds } 15991da177e4SLinus Torvalds 16001da177e4SLinus Torvalds /* 16011da177e4SLinus Torvalds * Receive a datagram from a socket. 16021da177e4SLinus Torvalds */ 16031da177e4SLinus Torvalds 16041da177e4SLinus Torvalds asmlinkage long sys_recv(int fd, void __user * ubuf, size_t size, unsigned flags) 16051da177e4SLinus Torvalds { 16061da177e4SLinus Torvalds return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); 16071da177e4SLinus Torvalds } 16081da177e4SLinus Torvalds 16091da177e4SLinus Torvalds /* 16101da177e4SLinus Torvalds * Set a socket option. Because we don't know the option lengths we have 16111da177e4SLinus Torvalds * to pass the user mode parameter for the protocols to sort out. 16121da177e4SLinus Torvalds */ 16131da177e4SLinus Torvalds 16141da177e4SLinus Torvalds asmlinkage long sys_setsockopt(int fd, int level, int optname, char __user *optval, int optlen) 16151da177e4SLinus Torvalds { 16161da177e4SLinus Torvalds int err; 16171da177e4SLinus Torvalds struct socket *sock; 16181da177e4SLinus Torvalds 16191da177e4SLinus Torvalds if (optlen < 0) 16201da177e4SLinus Torvalds return -EINVAL; 16211da177e4SLinus Torvalds 16221da177e4SLinus Torvalds if ((sock = sockfd_lookup(fd, &err))!=NULL) 16231da177e4SLinus Torvalds { 16241da177e4SLinus Torvalds err = security_socket_setsockopt(sock,level,optname); 16251da177e4SLinus Torvalds if (err) { 16261da177e4SLinus Torvalds sockfd_put(sock); 16271da177e4SLinus Torvalds return err; 16281da177e4SLinus Torvalds } 16291da177e4SLinus Torvalds 16301da177e4SLinus Torvalds if (level == SOL_SOCKET) 16311da177e4SLinus Torvalds err=sock_setsockopt(sock,level,optname,optval,optlen); 16321da177e4SLinus Torvalds else 16331da177e4SLinus Torvalds err=sock->ops->setsockopt(sock, level, optname, optval, optlen); 16341da177e4SLinus Torvalds sockfd_put(sock); 16351da177e4SLinus Torvalds } 16361da177e4SLinus Torvalds return err; 16371da177e4SLinus Torvalds } 16381da177e4SLinus Torvalds 16391da177e4SLinus Torvalds /* 16401da177e4SLinus Torvalds * Get a socket option. Because we don't know the option lengths we have 16411da177e4SLinus Torvalds * to pass a user mode parameter for the protocols to sort out. 16421da177e4SLinus Torvalds */ 16431da177e4SLinus Torvalds 16441da177e4SLinus Torvalds asmlinkage long sys_getsockopt(int fd, int level, int optname, char __user *optval, int __user *optlen) 16451da177e4SLinus Torvalds { 16461da177e4SLinus Torvalds int err; 16471da177e4SLinus Torvalds struct socket *sock; 16481da177e4SLinus Torvalds 16491da177e4SLinus Torvalds if ((sock = sockfd_lookup(fd, &err))!=NULL) 16501da177e4SLinus Torvalds { 16511da177e4SLinus Torvalds err = security_socket_getsockopt(sock, level, 16521da177e4SLinus Torvalds optname); 16531da177e4SLinus Torvalds if (err) { 16541da177e4SLinus Torvalds sockfd_put(sock); 16551da177e4SLinus Torvalds return err; 16561da177e4SLinus Torvalds } 16571da177e4SLinus Torvalds 16581da177e4SLinus Torvalds if (level == SOL_SOCKET) 16591da177e4SLinus Torvalds err=sock_getsockopt(sock,level,optname,optval,optlen); 16601da177e4SLinus Torvalds else 16611da177e4SLinus Torvalds err=sock->ops->getsockopt(sock, level, optname, optval, optlen); 16621da177e4SLinus Torvalds sockfd_put(sock); 16631da177e4SLinus Torvalds } 16641da177e4SLinus Torvalds return err; 16651da177e4SLinus Torvalds } 16661da177e4SLinus Torvalds 16671da177e4SLinus Torvalds 16681da177e4SLinus Torvalds /* 16691da177e4SLinus Torvalds * Shutdown a socket. 16701da177e4SLinus Torvalds */ 16711da177e4SLinus Torvalds 16721da177e4SLinus Torvalds asmlinkage long sys_shutdown(int fd, int how) 16731da177e4SLinus Torvalds { 16741da177e4SLinus Torvalds int err; 16751da177e4SLinus Torvalds struct socket *sock; 16761da177e4SLinus Torvalds 16771da177e4SLinus Torvalds if ((sock = sockfd_lookup(fd, &err))!=NULL) 16781da177e4SLinus Torvalds { 16791da177e4SLinus Torvalds err = security_socket_shutdown(sock, how); 16801da177e4SLinus Torvalds if (err) { 16811da177e4SLinus Torvalds sockfd_put(sock); 16821da177e4SLinus Torvalds return err; 16831da177e4SLinus Torvalds } 16841da177e4SLinus Torvalds 16851da177e4SLinus Torvalds err=sock->ops->shutdown(sock, how); 16861da177e4SLinus Torvalds sockfd_put(sock); 16871da177e4SLinus Torvalds } 16881da177e4SLinus Torvalds return err; 16891da177e4SLinus Torvalds } 16901da177e4SLinus Torvalds 16911da177e4SLinus Torvalds /* A couple of helpful macros for getting the address of the 32/64 bit 16921da177e4SLinus Torvalds * fields which are the same type (int / unsigned) on our platforms. 16931da177e4SLinus Torvalds */ 16941da177e4SLinus Torvalds #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) 16951da177e4SLinus Torvalds #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) 16961da177e4SLinus Torvalds #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) 16971da177e4SLinus Torvalds 16981da177e4SLinus Torvalds 16991da177e4SLinus Torvalds /* 17001da177e4SLinus Torvalds * BSD sendmsg interface 17011da177e4SLinus Torvalds */ 17021da177e4SLinus Torvalds 17031da177e4SLinus Torvalds asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags) 17041da177e4SLinus Torvalds { 17051da177e4SLinus Torvalds struct compat_msghdr __user *msg_compat = (struct compat_msghdr __user *)msg; 17061da177e4SLinus Torvalds struct socket *sock; 17071da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 17081da177e4SLinus Torvalds struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; 1709b9d717a7SAlex Williamson unsigned char ctl[sizeof(struct cmsghdr) + 20] 1710b9d717a7SAlex Williamson __attribute__ ((aligned (sizeof(__kernel_size_t)))); 1711b9d717a7SAlex Williamson /* 20 is size of ipv6_pktinfo */ 17121da177e4SLinus Torvalds unsigned char *ctl_buf = ctl; 17131da177e4SLinus Torvalds struct msghdr msg_sys; 17141da177e4SLinus Torvalds int err, ctl_len, iov_size, total_len; 17151da177e4SLinus Torvalds 17161da177e4SLinus Torvalds err = -EFAULT; 17171da177e4SLinus Torvalds if (MSG_CMSG_COMPAT & flags) { 17181da177e4SLinus Torvalds if (get_compat_msghdr(&msg_sys, msg_compat)) 17191da177e4SLinus Torvalds return -EFAULT; 17201da177e4SLinus Torvalds } else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) 17211da177e4SLinus Torvalds return -EFAULT; 17221da177e4SLinus Torvalds 17231da177e4SLinus Torvalds sock = sockfd_lookup(fd, &err); 17241da177e4SLinus Torvalds if (!sock) 17251da177e4SLinus Torvalds goto out; 17261da177e4SLinus Torvalds 17271da177e4SLinus Torvalds /* do not move before msg_sys is valid */ 17281da177e4SLinus Torvalds err = -EMSGSIZE; 17291da177e4SLinus Torvalds if (msg_sys.msg_iovlen > UIO_MAXIOV) 17301da177e4SLinus Torvalds goto out_put; 17311da177e4SLinus Torvalds 17321da177e4SLinus Torvalds /* Check whether to allocate the iovec area*/ 17331da177e4SLinus Torvalds err = -ENOMEM; 17341da177e4SLinus Torvalds iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); 17351da177e4SLinus Torvalds if (msg_sys.msg_iovlen > UIO_FASTIOV) { 17361da177e4SLinus Torvalds iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); 17371da177e4SLinus Torvalds if (!iov) 17381da177e4SLinus Torvalds goto out_put; 17391da177e4SLinus Torvalds } 17401da177e4SLinus Torvalds 17411da177e4SLinus Torvalds /* This will also move the address data into kernel space */ 17421da177e4SLinus Torvalds if (MSG_CMSG_COMPAT & flags) { 17431da177e4SLinus Torvalds err = verify_compat_iovec(&msg_sys, iov, address, VERIFY_READ); 17441da177e4SLinus Torvalds } else 17451da177e4SLinus Torvalds err = verify_iovec(&msg_sys, iov, address, VERIFY_READ); 17461da177e4SLinus Torvalds if (err < 0) 17471da177e4SLinus Torvalds goto out_freeiov; 17481da177e4SLinus Torvalds total_len = err; 17491da177e4SLinus Torvalds 17501da177e4SLinus Torvalds err = -ENOBUFS; 17511da177e4SLinus Torvalds 17521da177e4SLinus Torvalds if (msg_sys.msg_controllen > INT_MAX) 17531da177e4SLinus Torvalds goto out_freeiov; 17541da177e4SLinus Torvalds ctl_len = msg_sys.msg_controllen; 17551da177e4SLinus Torvalds if ((MSG_CMSG_COMPAT & flags) && ctl_len) { 17568920e8f9SAl Viro err = cmsghdr_from_user_compat_to_kern(&msg_sys, sock->sk, ctl, sizeof(ctl)); 17571da177e4SLinus Torvalds if (err) 17581da177e4SLinus Torvalds goto out_freeiov; 17591da177e4SLinus Torvalds ctl_buf = msg_sys.msg_control; 17608920e8f9SAl Viro ctl_len = msg_sys.msg_controllen; 17611da177e4SLinus Torvalds } else if (ctl_len) { 17621da177e4SLinus Torvalds if (ctl_len > sizeof(ctl)) 17631da177e4SLinus Torvalds { 17641da177e4SLinus Torvalds ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); 17651da177e4SLinus Torvalds if (ctl_buf == NULL) 17661da177e4SLinus Torvalds goto out_freeiov; 17671da177e4SLinus Torvalds } 17681da177e4SLinus Torvalds err = -EFAULT; 17691da177e4SLinus Torvalds /* 17701da177e4SLinus Torvalds * Careful! Before this, msg_sys.msg_control contains a user pointer. 17711da177e4SLinus Torvalds * Afterwards, it will be a kernel pointer. Thus the compiler-assisted 17721da177e4SLinus Torvalds * checking falls down on this. 17731da177e4SLinus Torvalds */ 17741da177e4SLinus Torvalds if (copy_from_user(ctl_buf, (void __user *) msg_sys.msg_control, ctl_len)) 17751da177e4SLinus Torvalds goto out_freectl; 17761da177e4SLinus Torvalds msg_sys.msg_control = ctl_buf; 17771da177e4SLinus Torvalds } 17781da177e4SLinus Torvalds msg_sys.msg_flags = flags; 17791da177e4SLinus Torvalds 17801da177e4SLinus Torvalds if (sock->file->f_flags & O_NONBLOCK) 17811da177e4SLinus Torvalds msg_sys.msg_flags |= MSG_DONTWAIT; 17821da177e4SLinus Torvalds err = sock_sendmsg(sock, &msg_sys, total_len); 17831da177e4SLinus Torvalds 17841da177e4SLinus Torvalds out_freectl: 17851da177e4SLinus Torvalds if (ctl_buf != ctl) 17861da177e4SLinus Torvalds sock_kfree_s(sock->sk, ctl_buf, ctl_len); 17871da177e4SLinus Torvalds out_freeiov: 17881da177e4SLinus Torvalds if (iov != iovstack) 17891da177e4SLinus Torvalds sock_kfree_s(sock->sk, iov, iov_size); 17901da177e4SLinus Torvalds out_put: 17911da177e4SLinus Torvalds sockfd_put(sock); 17921da177e4SLinus Torvalds out: 17931da177e4SLinus Torvalds return err; 17941da177e4SLinus Torvalds } 17951da177e4SLinus Torvalds 17961da177e4SLinus Torvalds /* 17971da177e4SLinus Torvalds * BSD recvmsg interface 17981da177e4SLinus Torvalds */ 17991da177e4SLinus Torvalds 18001da177e4SLinus Torvalds asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg, unsigned int flags) 18011da177e4SLinus Torvalds { 18021da177e4SLinus Torvalds struct compat_msghdr __user *msg_compat = (struct compat_msghdr __user *)msg; 18031da177e4SLinus Torvalds struct socket *sock; 18041da177e4SLinus Torvalds struct iovec iovstack[UIO_FASTIOV]; 18051da177e4SLinus Torvalds struct iovec *iov=iovstack; 18061da177e4SLinus Torvalds struct msghdr msg_sys; 18071da177e4SLinus Torvalds unsigned long cmsg_ptr; 18081da177e4SLinus Torvalds int err, iov_size, total_len, len; 18091da177e4SLinus Torvalds 18101da177e4SLinus Torvalds /* kernel mode address */ 18111da177e4SLinus Torvalds char addr[MAX_SOCK_ADDR]; 18121da177e4SLinus Torvalds 18131da177e4SLinus Torvalds /* user mode address pointers */ 18141da177e4SLinus Torvalds struct sockaddr __user *uaddr; 18151da177e4SLinus Torvalds int __user *uaddr_len; 18161da177e4SLinus Torvalds 18171da177e4SLinus Torvalds if (MSG_CMSG_COMPAT & flags) { 18181da177e4SLinus Torvalds if (get_compat_msghdr(&msg_sys, msg_compat)) 18191da177e4SLinus Torvalds return -EFAULT; 18201da177e4SLinus Torvalds } else 18211da177e4SLinus Torvalds if (copy_from_user(&msg_sys,msg,sizeof(struct msghdr))) 18221da177e4SLinus Torvalds return -EFAULT; 18231da177e4SLinus Torvalds 18241da177e4SLinus Torvalds sock = sockfd_lookup(fd, &err); 18251da177e4SLinus Torvalds if (!sock) 18261da177e4SLinus Torvalds goto out; 18271da177e4SLinus Torvalds 18281da177e4SLinus Torvalds err = -EMSGSIZE; 18291da177e4SLinus Torvalds if (msg_sys.msg_iovlen > UIO_MAXIOV) 18301da177e4SLinus Torvalds goto out_put; 18311da177e4SLinus Torvalds 18321da177e4SLinus Torvalds /* Check whether to allocate the iovec area*/ 18331da177e4SLinus Torvalds err = -ENOMEM; 18341da177e4SLinus Torvalds iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); 18351da177e4SLinus Torvalds if (msg_sys.msg_iovlen > UIO_FASTIOV) { 18361da177e4SLinus Torvalds iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); 18371da177e4SLinus Torvalds if (!iov) 18381da177e4SLinus Torvalds goto out_put; 18391da177e4SLinus Torvalds } 18401da177e4SLinus Torvalds 18411da177e4SLinus Torvalds /* 18421da177e4SLinus Torvalds * Save the user-mode address (verify_iovec will change the 18431da177e4SLinus Torvalds * kernel msghdr to use the kernel address space) 18441da177e4SLinus Torvalds */ 18451da177e4SLinus Torvalds 18461da177e4SLinus Torvalds uaddr = (void __user *) msg_sys.msg_name; 18471da177e4SLinus Torvalds uaddr_len = COMPAT_NAMELEN(msg); 18481da177e4SLinus Torvalds if (MSG_CMSG_COMPAT & flags) { 18491da177e4SLinus Torvalds err = verify_compat_iovec(&msg_sys, iov, addr, VERIFY_WRITE); 18501da177e4SLinus Torvalds } else 18511da177e4SLinus Torvalds err = verify_iovec(&msg_sys, iov, addr, VERIFY_WRITE); 18521da177e4SLinus Torvalds if (err < 0) 18531da177e4SLinus Torvalds goto out_freeiov; 18541da177e4SLinus Torvalds total_len=err; 18551da177e4SLinus Torvalds 18561da177e4SLinus Torvalds cmsg_ptr = (unsigned long)msg_sys.msg_control; 18571da177e4SLinus Torvalds msg_sys.msg_flags = 0; 18581da177e4SLinus Torvalds if (MSG_CMSG_COMPAT & flags) 18591da177e4SLinus Torvalds msg_sys.msg_flags = MSG_CMSG_COMPAT; 18601da177e4SLinus Torvalds 18611da177e4SLinus Torvalds if (sock->file->f_flags & O_NONBLOCK) 18621da177e4SLinus Torvalds flags |= MSG_DONTWAIT; 18631da177e4SLinus Torvalds err = sock_recvmsg(sock, &msg_sys, total_len, flags); 18641da177e4SLinus Torvalds if (err < 0) 18651da177e4SLinus Torvalds goto out_freeiov; 18661da177e4SLinus Torvalds len = err; 18671da177e4SLinus Torvalds 18681da177e4SLinus Torvalds if (uaddr != NULL) { 18691da177e4SLinus Torvalds err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr, uaddr_len); 18701da177e4SLinus Torvalds if (err < 0) 18711da177e4SLinus Torvalds goto out_freeiov; 18721da177e4SLinus Torvalds } 187337f7f421SDavid S. Miller err = __put_user((msg_sys.msg_flags & ~MSG_CMSG_COMPAT), 187437f7f421SDavid S. Miller COMPAT_FLAGS(msg)); 18751da177e4SLinus Torvalds if (err) 18761da177e4SLinus Torvalds goto out_freeiov; 18771da177e4SLinus Torvalds if (MSG_CMSG_COMPAT & flags) 18781da177e4SLinus Torvalds err = __put_user((unsigned long)msg_sys.msg_control-cmsg_ptr, 18791da177e4SLinus Torvalds &msg_compat->msg_controllen); 18801da177e4SLinus Torvalds else 18811da177e4SLinus Torvalds err = __put_user((unsigned long)msg_sys.msg_control-cmsg_ptr, 18821da177e4SLinus Torvalds &msg->msg_controllen); 18831da177e4SLinus Torvalds if (err) 18841da177e4SLinus Torvalds goto out_freeiov; 18851da177e4SLinus Torvalds err = len; 18861da177e4SLinus Torvalds 18871da177e4SLinus Torvalds out_freeiov: 18881da177e4SLinus Torvalds if (iov != iovstack) 18891da177e4SLinus Torvalds sock_kfree_s(sock->sk, iov, iov_size); 18901da177e4SLinus Torvalds out_put: 18911da177e4SLinus Torvalds sockfd_put(sock); 18921da177e4SLinus Torvalds out: 18931da177e4SLinus Torvalds return err; 18941da177e4SLinus Torvalds } 18951da177e4SLinus Torvalds 18961da177e4SLinus Torvalds #ifdef __ARCH_WANT_SYS_SOCKETCALL 18971da177e4SLinus Torvalds 18981da177e4SLinus Torvalds /* Argument list sizes for sys_socketcall */ 18991da177e4SLinus Torvalds #define AL(x) ((x) * sizeof(unsigned long)) 19001da177e4SLinus Torvalds static unsigned char nargs[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3), 19011da177e4SLinus Torvalds AL(3),AL(3),AL(4),AL(4),AL(4),AL(6), 19021da177e4SLinus Torvalds AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)}; 19031da177e4SLinus Torvalds #undef AL 19041da177e4SLinus Torvalds 19051da177e4SLinus Torvalds /* 19061da177e4SLinus Torvalds * System call vectors. 19071da177e4SLinus Torvalds * 19081da177e4SLinus Torvalds * Argument checking cleaned up. Saved 20% in size. 19091da177e4SLinus Torvalds * This function doesn't need to set the kernel lock because 19101da177e4SLinus Torvalds * it is set by the callees. 19111da177e4SLinus Torvalds */ 19121da177e4SLinus Torvalds 19131da177e4SLinus Torvalds asmlinkage long sys_socketcall(int call, unsigned long __user *args) 19141da177e4SLinus Torvalds { 19151da177e4SLinus Torvalds unsigned long a[6]; 19161da177e4SLinus Torvalds unsigned long a0,a1; 19171da177e4SLinus Torvalds int err; 19181da177e4SLinus Torvalds 19191da177e4SLinus Torvalds if(call<1||call>SYS_RECVMSG) 19201da177e4SLinus Torvalds return -EINVAL; 19211da177e4SLinus Torvalds 19221da177e4SLinus Torvalds /* copy_from_user should be SMP safe. */ 19231da177e4SLinus Torvalds if (copy_from_user(a, args, nargs[call])) 19241da177e4SLinus Torvalds return -EFAULT; 19251da177e4SLinus Torvalds 19264bcff1b3SDavid Woodhouse err = audit_socketcall(nargs[call]/sizeof(unsigned long), a); 19273ec3b2fbSDavid Woodhouse if (err) 19283ec3b2fbSDavid Woodhouse return err; 19293ec3b2fbSDavid Woodhouse 19301da177e4SLinus Torvalds a0=a[0]; 19311da177e4SLinus Torvalds a1=a[1]; 19321da177e4SLinus Torvalds 19331da177e4SLinus Torvalds switch(call) 19341da177e4SLinus Torvalds { 19351da177e4SLinus Torvalds case SYS_SOCKET: 19361da177e4SLinus Torvalds err = sys_socket(a0,a1,a[2]); 19371da177e4SLinus Torvalds break; 19381da177e4SLinus Torvalds case SYS_BIND: 19391da177e4SLinus Torvalds err = sys_bind(a0,(struct sockaddr __user *)a1, a[2]); 19401da177e4SLinus Torvalds break; 19411da177e4SLinus Torvalds case SYS_CONNECT: 19421da177e4SLinus Torvalds err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); 19431da177e4SLinus Torvalds break; 19441da177e4SLinus Torvalds case SYS_LISTEN: 19451da177e4SLinus Torvalds err = sys_listen(a0,a1); 19461da177e4SLinus Torvalds break; 19471da177e4SLinus Torvalds case SYS_ACCEPT: 19481da177e4SLinus Torvalds err = sys_accept(a0,(struct sockaddr __user *)a1, (int __user *)a[2]); 19491da177e4SLinus Torvalds break; 19501da177e4SLinus Torvalds case SYS_GETSOCKNAME: 19511da177e4SLinus Torvalds err = sys_getsockname(a0,(struct sockaddr __user *)a1, (int __user *)a[2]); 19521da177e4SLinus Torvalds break; 19531da177e4SLinus Torvalds case SYS_GETPEERNAME: 19541da177e4SLinus Torvalds err = sys_getpeername(a0, (struct sockaddr __user *)a1, (int __user *)a[2]); 19551da177e4SLinus Torvalds break; 19561da177e4SLinus Torvalds case SYS_SOCKETPAIR: 19571da177e4SLinus Torvalds err = sys_socketpair(a0,a1, a[2], (int __user *)a[3]); 19581da177e4SLinus Torvalds break; 19591da177e4SLinus Torvalds case SYS_SEND: 19601da177e4SLinus Torvalds err = sys_send(a0, (void __user *)a1, a[2], a[3]); 19611da177e4SLinus Torvalds break; 19621da177e4SLinus Torvalds case SYS_SENDTO: 19631da177e4SLinus Torvalds err = sys_sendto(a0,(void __user *)a1, a[2], a[3], 19641da177e4SLinus Torvalds (struct sockaddr __user *)a[4], a[5]); 19651da177e4SLinus Torvalds break; 19661da177e4SLinus Torvalds case SYS_RECV: 19671da177e4SLinus Torvalds err = sys_recv(a0, (void __user *)a1, a[2], a[3]); 19681da177e4SLinus Torvalds break; 19691da177e4SLinus Torvalds case SYS_RECVFROM: 19701da177e4SLinus Torvalds err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], 19711da177e4SLinus Torvalds (struct sockaddr __user *)a[4], (int __user *)a[5]); 19721da177e4SLinus Torvalds break; 19731da177e4SLinus Torvalds case SYS_SHUTDOWN: 19741da177e4SLinus Torvalds err = sys_shutdown(a0,a1); 19751da177e4SLinus Torvalds break; 19761da177e4SLinus Torvalds case SYS_SETSOCKOPT: 19771da177e4SLinus Torvalds err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); 19781da177e4SLinus Torvalds break; 19791da177e4SLinus Torvalds case SYS_GETSOCKOPT: 19801da177e4SLinus Torvalds err = sys_getsockopt(a0, a1, a[2], (char __user *)a[3], (int __user *)a[4]); 19811da177e4SLinus Torvalds break; 19821da177e4SLinus Torvalds case SYS_SENDMSG: 19831da177e4SLinus Torvalds err = sys_sendmsg(a0, (struct msghdr __user *) a1, a[2]); 19841da177e4SLinus Torvalds break; 19851da177e4SLinus Torvalds case SYS_RECVMSG: 19861da177e4SLinus Torvalds err = sys_recvmsg(a0, (struct msghdr __user *) a1, a[2]); 19871da177e4SLinus Torvalds break; 19881da177e4SLinus Torvalds default: 19891da177e4SLinus Torvalds err = -EINVAL; 19901da177e4SLinus Torvalds break; 19911da177e4SLinus Torvalds } 19921da177e4SLinus Torvalds return err; 19931da177e4SLinus Torvalds } 19941da177e4SLinus Torvalds 19951da177e4SLinus Torvalds #endif /* __ARCH_WANT_SYS_SOCKETCALL */ 19961da177e4SLinus Torvalds 19971da177e4SLinus Torvalds /* 19981da177e4SLinus Torvalds * This function is called by a protocol handler that wants to 19991da177e4SLinus Torvalds * advertise its address family, and have it linked into the 20001da177e4SLinus Torvalds * SOCKET module. 20011da177e4SLinus Torvalds */ 20021da177e4SLinus Torvalds 20031da177e4SLinus Torvalds int sock_register(struct net_proto_family *ops) 20041da177e4SLinus Torvalds { 20051da177e4SLinus Torvalds int err; 20061da177e4SLinus Torvalds 20071da177e4SLinus Torvalds if (ops->family >= NPROTO) { 20081da177e4SLinus Torvalds printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); 20091da177e4SLinus Torvalds return -ENOBUFS; 20101da177e4SLinus Torvalds } 20111da177e4SLinus Torvalds net_family_write_lock(); 20121da177e4SLinus Torvalds err = -EEXIST; 20131da177e4SLinus Torvalds if (net_families[ops->family] == NULL) { 20141da177e4SLinus Torvalds net_families[ops->family]=ops; 20151da177e4SLinus Torvalds err = 0; 20161da177e4SLinus Torvalds } 20171da177e4SLinus Torvalds net_family_write_unlock(); 20181da177e4SLinus Torvalds printk(KERN_INFO "NET: Registered protocol family %d\n", 20191da177e4SLinus Torvalds ops->family); 20201da177e4SLinus Torvalds return err; 20211da177e4SLinus Torvalds } 20221da177e4SLinus Torvalds 20231da177e4SLinus Torvalds /* 20241da177e4SLinus Torvalds * This function is called by a protocol handler that wants to 20251da177e4SLinus Torvalds * remove its address family, and have it unlinked from the 20261da177e4SLinus Torvalds * SOCKET module. 20271da177e4SLinus Torvalds */ 20281da177e4SLinus Torvalds 20291da177e4SLinus Torvalds int sock_unregister(int family) 20301da177e4SLinus Torvalds { 20311da177e4SLinus Torvalds if (family < 0 || family >= NPROTO) 20321da177e4SLinus Torvalds return -1; 20331da177e4SLinus Torvalds 20341da177e4SLinus Torvalds net_family_write_lock(); 20351da177e4SLinus Torvalds net_families[family]=NULL; 20361da177e4SLinus Torvalds net_family_write_unlock(); 20371da177e4SLinus Torvalds printk(KERN_INFO "NET: Unregistered protocol family %d\n", 20381da177e4SLinus Torvalds family); 20391da177e4SLinus Torvalds return 0; 20401da177e4SLinus Torvalds } 20411da177e4SLinus Torvalds 204277d76ea3SAndi Kleen static int __init sock_init(void) 20431da177e4SLinus Torvalds { 20441da177e4SLinus Torvalds /* 20451da177e4SLinus Torvalds * Initialize sock SLAB cache. 20461da177e4SLinus Torvalds */ 20471da177e4SLinus Torvalds 20481da177e4SLinus Torvalds sk_init(); 20491da177e4SLinus Torvalds 20501da177e4SLinus Torvalds /* 20511da177e4SLinus Torvalds * Initialize skbuff SLAB cache 20521da177e4SLinus Torvalds */ 20531da177e4SLinus Torvalds skb_init(); 20541da177e4SLinus Torvalds 20551da177e4SLinus Torvalds /* 20561da177e4SLinus Torvalds * Initialize the protocols module. 20571da177e4SLinus Torvalds */ 20581da177e4SLinus Torvalds 20591da177e4SLinus Torvalds init_inodecache(); 20601da177e4SLinus Torvalds register_filesystem(&sock_fs_type); 20611da177e4SLinus Torvalds sock_mnt = kern_mount(&sock_fs_type); 206277d76ea3SAndi Kleen 206377d76ea3SAndi Kleen /* The real protocol initialization is performed in later initcalls. 20641da177e4SLinus Torvalds */ 20651da177e4SLinus Torvalds 20661da177e4SLinus Torvalds #ifdef CONFIG_NETFILTER 20671da177e4SLinus Torvalds netfilter_init(); 20681da177e4SLinus Torvalds #endif 2069cbeb321aSDavid S. Miller 2070cbeb321aSDavid S. Miller return 0; 20711da177e4SLinus Torvalds } 20721da177e4SLinus Torvalds 207377d76ea3SAndi Kleen core_initcall(sock_init); /* early initcall */ 207477d76ea3SAndi Kleen 20751da177e4SLinus Torvalds #ifdef CONFIG_PROC_FS 20761da177e4SLinus Torvalds void socket_seq_show(struct seq_file *seq) 20771da177e4SLinus Torvalds { 20781da177e4SLinus Torvalds int cpu; 20791da177e4SLinus Torvalds int counter = 0; 20801da177e4SLinus Torvalds 208188a2a4acSEric Dumazet for_each_cpu(cpu) 20821da177e4SLinus Torvalds counter += per_cpu(sockets_in_use, cpu); 20831da177e4SLinus Torvalds 20841da177e4SLinus Torvalds /* It can be negative, by the way. 8) */ 20851da177e4SLinus Torvalds if (counter < 0) 20861da177e4SLinus Torvalds counter = 0; 20871da177e4SLinus Torvalds 20881da177e4SLinus Torvalds seq_printf(seq, "sockets: used %d\n", counter); 20891da177e4SLinus Torvalds } 20901da177e4SLinus Torvalds #endif /* CONFIG_PROC_FS */ 20911da177e4SLinus Torvalds 20921da177e4SLinus Torvalds /* ABI emulation layers need these two */ 20931da177e4SLinus Torvalds EXPORT_SYMBOL(move_addr_to_kernel); 20941da177e4SLinus Torvalds EXPORT_SYMBOL(move_addr_to_user); 20951da177e4SLinus Torvalds EXPORT_SYMBOL(sock_create); 20961da177e4SLinus Torvalds EXPORT_SYMBOL(sock_create_kern); 20971da177e4SLinus Torvalds EXPORT_SYMBOL(sock_create_lite); 20981da177e4SLinus Torvalds EXPORT_SYMBOL(sock_map_fd); 20991da177e4SLinus Torvalds EXPORT_SYMBOL(sock_recvmsg); 21001da177e4SLinus Torvalds EXPORT_SYMBOL(sock_register); 21011da177e4SLinus Torvalds EXPORT_SYMBOL(sock_release); 21021da177e4SLinus Torvalds EXPORT_SYMBOL(sock_sendmsg); 21031da177e4SLinus Torvalds EXPORT_SYMBOL(sock_unregister); 21041da177e4SLinus Torvalds EXPORT_SYMBOL(sock_wake_async); 21051da177e4SLinus Torvalds EXPORT_SYMBOL(sockfd_lookup); 21061da177e4SLinus Torvalds EXPORT_SYMBOL(kernel_sendmsg); 21071da177e4SLinus Torvalds EXPORT_SYMBOL(kernel_recvmsg); 2108