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> 7*02c30a84SJesper 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> 731da177e4SLinus Torvalds #include <linux/init.h> 741da177e4SLinus Torvalds #include <linux/poll.h> 751da177e4SLinus Torvalds #include <linux/cache.h> 761da177e4SLinus Torvalds #include <linux/module.h> 771da177e4SLinus Torvalds #include <linux/highmem.h> 781da177e4SLinus Torvalds #include <linux/divert.h> 791da177e4SLinus Torvalds #include <linux/mount.h> 801da177e4SLinus Torvalds #include <linux/security.h> 811da177e4SLinus Torvalds #include <linux/syscalls.h> 821da177e4SLinus Torvalds #include <linux/compat.h> 831da177e4SLinus Torvalds #include <linux/kmod.h> 841da177e4SLinus Torvalds 851da177e4SLinus Torvalds #ifdef CONFIG_NET_RADIO 861da177e4SLinus Torvalds #include <linux/wireless.h> /* Note : will define WIRELESS_EXT */ 871da177e4SLinus Torvalds #endif /* CONFIG_NET_RADIO */ 881da177e4SLinus Torvalds 891da177e4SLinus Torvalds #include <asm/uaccess.h> 901da177e4SLinus Torvalds #include <asm/unistd.h> 911da177e4SLinus Torvalds 921da177e4SLinus Torvalds #include <net/compat.h> 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds #include <net/sock.h> 951da177e4SLinus Torvalds #include <linux/netfilter.h> 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds static int sock_no_open(struct inode *irrelevant, struct file *dontcare); 981da177e4SLinus Torvalds static ssize_t sock_aio_read(struct kiocb *iocb, char __user *buf, 991da177e4SLinus Torvalds size_t size, loff_t pos); 1001da177e4SLinus Torvalds static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *buf, 1011da177e4SLinus Torvalds size_t size, loff_t pos); 1021da177e4SLinus Torvalds static int sock_mmap(struct file *file, struct vm_area_struct * vma); 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds static int sock_close(struct inode *inode, struct file *file); 1051da177e4SLinus Torvalds static unsigned int sock_poll(struct file *file, 1061da177e4SLinus Torvalds struct poll_table_struct *wait); 1071da177e4SLinus Torvalds static long sock_ioctl(struct file *file, 1081da177e4SLinus Torvalds unsigned int cmd, unsigned long arg); 1091da177e4SLinus Torvalds static int sock_fasync(int fd, struct file *filp, int on); 1101da177e4SLinus Torvalds static ssize_t sock_readv(struct file *file, const struct iovec *vector, 1111da177e4SLinus Torvalds unsigned long count, loff_t *ppos); 1121da177e4SLinus Torvalds static ssize_t sock_writev(struct file *file, const struct iovec *vector, 1131da177e4SLinus Torvalds unsigned long count, loff_t *ppos); 1141da177e4SLinus Torvalds static ssize_t sock_sendpage(struct file *file, struct page *page, 1151da177e4SLinus Torvalds int offset, size_t size, loff_t *ppos, int more); 1161da177e4SLinus Torvalds 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvalds /* 1191da177e4SLinus Torvalds * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear 1201da177e4SLinus Torvalds * in the operation structures but are done directly via the socketcall() multiplexor. 1211da177e4SLinus Torvalds */ 1221da177e4SLinus Torvalds 1231da177e4SLinus Torvalds static struct file_operations socket_file_ops = { 1241da177e4SLinus Torvalds .owner = THIS_MODULE, 1251da177e4SLinus Torvalds .llseek = no_llseek, 1261da177e4SLinus Torvalds .aio_read = sock_aio_read, 1271da177e4SLinus Torvalds .aio_write = sock_aio_write, 1281da177e4SLinus Torvalds .poll = sock_poll, 1291da177e4SLinus Torvalds .unlocked_ioctl = sock_ioctl, 1301da177e4SLinus Torvalds .mmap = sock_mmap, 1311da177e4SLinus Torvalds .open = sock_no_open, /* special open code to disallow open via /proc */ 1321da177e4SLinus Torvalds .release = sock_close, 1331da177e4SLinus Torvalds .fasync = sock_fasync, 1341da177e4SLinus Torvalds .readv = sock_readv, 1351da177e4SLinus Torvalds .writev = sock_writev, 1361da177e4SLinus Torvalds .sendpage = sock_sendpage 1371da177e4SLinus Torvalds }; 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds /* 1401da177e4SLinus Torvalds * The protocol list. Each protocol is registered in here. 1411da177e4SLinus Torvalds */ 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds static struct net_proto_family *net_families[NPROTO]; 1441da177e4SLinus Torvalds 1451da177e4SLinus Torvalds #if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT) 1461da177e4SLinus Torvalds static atomic_t net_family_lockct = ATOMIC_INIT(0); 1471da177e4SLinus Torvalds static DEFINE_SPINLOCK(net_family_lock); 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvalds /* The strategy is: modifications net_family vector are short, do not 1501da177e4SLinus Torvalds sleep and veeery rare, but read access should be free of any exclusive 1511da177e4SLinus Torvalds locks. 1521da177e4SLinus Torvalds */ 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds static void net_family_write_lock(void) 1551da177e4SLinus Torvalds { 1561da177e4SLinus Torvalds spin_lock(&net_family_lock); 1571da177e4SLinus Torvalds while (atomic_read(&net_family_lockct) != 0) { 1581da177e4SLinus Torvalds spin_unlock(&net_family_lock); 1591da177e4SLinus Torvalds 1601da177e4SLinus Torvalds yield(); 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds spin_lock(&net_family_lock); 1631da177e4SLinus Torvalds } 1641da177e4SLinus Torvalds } 1651da177e4SLinus Torvalds 1661da177e4SLinus Torvalds static __inline__ void net_family_write_unlock(void) 1671da177e4SLinus Torvalds { 1681da177e4SLinus Torvalds spin_unlock(&net_family_lock); 1691da177e4SLinus Torvalds } 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvalds static __inline__ void net_family_read_lock(void) 1721da177e4SLinus Torvalds { 1731da177e4SLinus Torvalds atomic_inc(&net_family_lockct); 1741da177e4SLinus Torvalds spin_unlock_wait(&net_family_lock); 1751da177e4SLinus Torvalds } 1761da177e4SLinus Torvalds 1771da177e4SLinus Torvalds static __inline__ void net_family_read_unlock(void) 1781da177e4SLinus Torvalds { 1791da177e4SLinus Torvalds atomic_dec(&net_family_lockct); 1801da177e4SLinus Torvalds } 1811da177e4SLinus Torvalds 1821da177e4SLinus Torvalds #else 1831da177e4SLinus Torvalds #define net_family_write_lock() do { } while(0) 1841da177e4SLinus Torvalds #define net_family_write_unlock() do { } while(0) 1851da177e4SLinus Torvalds #define net_family_read_lock() do { } while(0) 1861da177e4SLinus Torvalds #define net_family_read_unlock() do { } while(0) 1871da177e4SLinus Torvalds #endif 1881da177e4SLinus Torvalds 1891da177e4SLinus Torvalds 1901da177e4SLinus Torvalds /* 1911da177e4SLinus Torvalds * Statistics counters of the socket lists 1921da177e4SLinus Torvalds */ 1931da177e4SLinus Torvalds 1941da177e4SLinus Torvalds static DEFINE_PER_CPU(int, sockets_in_use) = 0; 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds /* 1971da177e4SLinus Torvalds * Support routines. Move socket addresses back and forth across the kernel/user 1981da177e4SLinus Torvalds * divide and look after the messy bits. 1991da177e4SLinus Torvalds */ 2001da177e4SLinus Torvalds 2011da177e4SLinus Torvalds #define MAX_SOCK_ADDR 128 /* 108 for Unix domain - 2021da177e4SLinus Torvalds 16 for IP, 16 for IPX, 2031da177e4SLinus Torvalds 24 for IPv6, 2041da177e4SLinus Torvalds about 80 for AX.25 2051da177e4SLinus Torvalds must be at least one bigger than 2061da177e4SLinus Torvalds the AF_UNIX size (see net/unix/af_unix.c 2071da177e4SLinus Torvalds :unix_mkname()). 2081da177e4SLinus Torvalds */ 2091da177e4SLinus Torvalds 2101da177e4SLinus Torvalds /** 2111da177e4SLinus Torvalds * move_addr_to_kernel - copy a socket address into kernel space 2121da177e4SLinus Torvalds * @uaddr: Address in user space 2131da177e4SLinus Torvalds * @kaddr: Address in kernel space 2141da177e4SLinus Torvalds * @ulen: Length in user space 2151da177e4SLinus Torvalds * 2161da177e4SLinus Torvalds * The address is copied into kernel space. If the provided address is 2171da177e4SLinus Torvalds * too long an error code of -EINVAL is returned. If the copy gives 2181da177e4SLinus Torvalds * invalid addresses -EFAULT is returned. On a success 0 is returned. 2191da177e4SLinus Torvalds */ 2201da177e4SLinus Torvalds 2211da177e4SLinus Torvalds int move_addr_to_kernel(void __user *uaddr, int ulen, void *kaddr) 2221da177e4SLinus Torvalds { 2231da177e4SLinus Torvalds if(ulen<0||ulen>MAX_SOCK_ADDR) 2241da177e4SLinus Torvalds return -EINVAL; 2251da177e4SLinus Torvalds if(ulen==0) 2261da177e4SLinus Torvalds return 0; 2271da177e4SLinus Torvalds if(copy_from_user(kaddr,uaddr,ulen)) 2281da177e4SLinus Torvalds return -EFAULT; 2291da177e4SLinus Torvalds return 0; 2301da177e4SLinus Torvalds } 2311da177e4SLinus Torvalds 2321da177e4SLinus Torvalds /** 2331da177e4SLinus Torvalds * move_addr_to_user - copy an address to user space 2341da177e4SLinus Torvalds * @kaddr: kernel space address 2351da177e4SLinus Torvalds * @klen: length of address in kernel 2361da177e4SLinus Torvalds * @uaddr: user space address 2371da177e4SLinus Torvalds * @ulen: pointer to user length field 2381da177e4SLinus Torvalds * 2391da177e4SLinus Torvalds * The value pointed to by ulen on entry is the buffer length available. 2401da177e4SLinus Torvalds * This is overwritten with the buffer space used. -EINVAL is returned 2411da177e4SLinus Torvalds * if an overlong buffer is specified or a negative buffer size. -EFAULT 2421da177e4SLinus Torvalds * is returned if either the buffer or the length field are not 2431da177e4SLinus Torvalds * accessible. 2441da177e4SLinus Torvalds * After copying the data up to the limit the user specifies, the true 2451da177e4SLinus Torvalds * length of the data is written over the length limit the user 2461da177e4SLinus Torvalds * specified. Zero is returned for a success. 2471da177e4SLinus Torvalds */ 2481da177e4SLinus Torvalds 2491da177e4SLinus Torvalds int move_addr_to_user(void *kaddr, int klen, void __user *uaddr, int __user *ulen) 2501da177e4SLinus Torvalds { 2511da177e4SLinus Torvalds int err; 2521da177e4SLinus Torvalds int len; 2531da177e4SLinus Torvalds 2541da177e4SLinus Torvalds if((err=get_user(len, ulen))) 2551da177e4SLinus Torvalds return err; 2561da177e4SLinus Torvalds if(len>klen) 2571da177e4SLinus Torvalds len=klen; 2581da177e4SLinus Torvalds if(len<0 || len> MAX_SOCK_ADDR) 2591da177e4SLinus Torvalds return -EINVAL; 2601da177e4SLinus Torvalds if(len) 2611da177e4SLinus Torvalds { 2621da177e4SLinus Torvalds if(copy_to_user(uaddr,kaddr,len)) 2631da177e4SLinus Torvalds return -EFAULT; 2641da177e4SLinus Torvalds } 2651da177e4SLinus Torvalds /* 2661da177e4SLinus Torvalds * "fromlen shall refer to the value before truncation.." 2671da177e4SLinus Torvalds * 1003.1g 2681da177e4SLinus Torvalds */ 2691da177e4SLinus Torvalds return __put_user(klen, ulen); 2701da177e4SLinus Torvalds } 2711da177e4SLinus Torvalds 2721da177e4SLinus Torvalds #define SOCKFS_MAGIC 0x534F434B 2731da177e4SLinus Torvalds 2741da177e4SLinus Torvalds static kmem_cache_t * sock_inode_cachep; 2751da177e4SLinus Torvalds 2761da177e4SLinus Torvalds static struct inode *sock_alloc_inode(struct super_block *sb) 2771da177e4SLinus Torvalds { 2781da177e4SLinus Torvalds struct socket_alloc *ei; 2791da177e4SLinus Torvalds ei = (struct socket_alloc *)kmem_cache_alloc(sock_inode_cachep, SLAB_KERNEL); 2801da177e4SLinus Torvalds if (!ei) 2811da177e4SLinus Torvalds return NULL; 2821da177e4SLinus Torvalds init_waitqueue_head(&ei->socket.wait); 2831da177e4SLinus Torvalds 2841da177e4SLinus Torvalds ei->socket.fasync_list = NULL; 2851da177e4SLinus Torvalds ei->socket.state = SS_UNCONNECTED; 2861da177e4SLinus Torvalds ei->socket.flags = 0; 2871da177e4SLinus Torvalds ei->socket.ops = NULL; 2881da177e4SLinus Torvalds ei->socket.sk = NULL; 2891da177e4SLinus Torvalds ei->socket.file = NULL; 2901da177e4SLinus Torvalds ei->socket.flags = 0; 2911da177e4SLinus Torvalds 2921da177e4SLinus Torvalds return &ei->vfs_inode; 2931da177e4SLinus Torvalds } 2941da177e4SLinus Torvalds 2951da177e4SLinus Torvalds static void sock_destroy_inode(struct inode *inode) 2961da177e4SLinus Torvalds { 2971da177e4SLinus Torvalds kmem_cache_free(sock_inode_cachep, 2981da177e4SLinus Torvalds container_of(inode, struct socket_alloc, vfs_inode)); 2991da177e4SLinus Torvalds } 3001da177e4SLinus Torvalds 3011da177e4SLinus Torvalds static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) 3021da177e4SLinus Torvalds { 3031da177e4SLinus Torvalds struct socket_alloc *ei = (struct socket_alloc *) foo; 3041da177e4SLinus Torvalds 3051da177e4SLinus Torvalds if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == 3061da177e4SLinus Torvalds SLAB_CTOR_CONSTRUCTOR) 3071da177e4SLinus Torvalds inode_init_once(&ei->vfs_inode); 3081da177e4SLinus Torvalds } 3091da177e4SLinus Torvalds 3101da177e4SLinus Torvalds static int init_inodecache(void) 3111da177e4SLinus Torvalds { 3121da177e4SLinus Torvalds sock_inode_cachep = kmem_cache_create("sock_inode_cache", 3131da177e4SLinus Torvalds sizeof(struct socket_alloc), 3141da177e4SLinus Torvalds 0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT, 3151da177e4SLinus Torvalds init_once, NULL); 3161da177e4SLinus Torvalds if (sock_inode_cachep == NULL) 3171da177e4SLinus Torvalds return -ENOMEM; 3181da177e4SLinus Torvalds return 0; 3191da177e4SLinus Torvalds } 3201da177e4SLinus Torvalds 3211da177e4SLinus Torvalds static struct super_operations sockfs_ops = { 3221da177e4SLinus Torvalds .alloc_inode = sock_alloc_inode, 3231da177e4SLinus Torvalds .destroy_inode =sock_destroy_inode, 3241da177e4SLinus Torvalds .statfs = simple_statfs, 3251da177e4SLinus Torvalds }; 3261da177e4SLinus Torvalds 3271da177e4SLinus Torvalds static struct super_block *sockfs_get_sb(struct file_system_type *fs_type, 3281da177e4SLinus Torvalds int flags, const char *dev_name, void *data) 3291da177e4SLinus Torvalds { 3301da177e4SLinus Torvalds return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC); 3311da177e4SLinus Torvalds } 3321da177e4SLinus Torvalds 3331da177e4SLinus Torvalds static struct vfsmount *sock_mnt; 3341da177e4SLinus Torvalds 3351da177e4SLinus Torvalds static struct file_system_type sock_fs_type = { 3361da177e4SLinus Torvalds .name = "sockfs", 3371da177e4SLinus Torvalds .get_sb = sockfs_get_sb, 3381da177e4SLinus Torvalds .kill_sb = kill_anon_super, 3391da177e4SLinus Torvalds }; 3401da177e4SLinus Torvalds static int sockfs_delete_dentry(struct dentry *dentry) 3411da177e4SLinus Torvalds { 3421da177e4SLinus Torvalds return 1; 3431da177e4SLinus Torvalds } 3441da177e4SLinus Torvalds static struct dentry_operations sockfs_dentry_operations = { 3451da177e4SLinus Torvalds .d_delete = sockfs_delete_dentry, 3461da177e4SLinus Torvalds }; 3471da177e4SLinus Torvalds 3481da177e4SLinus Torvalds /* 3491da177e4SLinus Torvalds * Obtains the first available file descriptor and sets it up for use. 3501da177e4SLinus Torvalds * 3511da177e4SLinus Torvalds * This function creates file structure and maps it to fd space 3521da177e4SLinus Torvalds * of current process. On success it returns file descriptor 3531da177e4SLinus Torvalds * and file struct implicitly stored in sock->file. 3541da177e4SLinus Torvalds * Note that another thread may close file descriptor before we return 3551da177e4SLinus Torvalds * from this function. We use the fact that now we do not refer 3561da177e4SLinus Torvalds * to socket after mapping. If one day we will need it, this 3571da177e4SLinus Torvalds * function will increment ref. count on file by 1. 3581da177e4SLinus Torvalds * 3591da177e4SLinus Torvalds * In any case returned fd MAY BE not valid! 3601da177e4SLinus Torvalds * This race condition is unavoidable 3611da177e4SLinus Torvalds * with shared fd spaces, we cannot solve it inside kernel, 3621da177e4SLinus Torvalds * but we take care of internal coherence yet. 3631da177e4SLinus Torvalds */ 3641da177e4SLinus Torvalds 3651da177e4SLinus Torvalds int sock_map_fd(struct socket *sock) 3661da177e4SLinus Torvalds { 3671da177e4SLinus Torvalds int fd; 3681da177e4SLinus Torvalds struct qstr this; 3691da177e4SLinus Torvalds char name[32]; 3701da177e4SLinus Torvalds 3711da177e4SLinus Torvalds /* 3721da177e4SLinus Torvalds * Find a file descriptor suitable for return to the user. 3731da177e4SLinus Torvalds */ 3741da177e4SLinus Torvalds 3751da177e4SLinus Torvalds fd = get_unused_fd(); 3761da177e4SLinus Torvalds if (fd >= 0) { 3771da177e4SLinus Torvalds struct file *file = get_empty_filp(); 3781da177e4SLinus Torvalds 3791da177e4SLinus Torvalds if (!file) { 3801da177e4SLinus Torvalds put_unused_fd(fd); 3811da177e4SLinus Torvalds fd = -ENFILE; 3821da177e4SLinus Torvalds goto out; 3831da177e4SLinus Torvalds } 3841da177e4SLinus Torvalds 3851da177e4SLinus Torvalds sprintf(name, "[%lu]", SOCK_INODE(sock)->i_ino); 3861da177e4SLinus Torvalds this.name = name; 3871da177e4SLinus Torvalds this.len = strlen(name); 3881da177e4SLinus Torvalds this.hash = SOCK_INODE(sock)->i_ino; 3891da177e4SLinus Torvalds 3901da177e4SLinus Torvalds file->f_dentry = d_alloc(sock_mnt->mnt_sb->s_root, &this); 3911da177e4SLinus Torvalds if (!file->f_dentry) { 3921da177e4SLinus Torvalds put_filp(file); 3931da177e4SLinus Torvalds put_unused_fd(fd); 3941da177e4SLinus Torvalds fd = -ENOMEM; 3951da177e4SLinus Torvalds goto out; 3961da177e4SLinus Torvalds } 3971da177e4SLinus Torvalds file->f_dentry->d_op = &sockfs_dentry_operations; 3981da177e4SLinus Torvalds d_add(file->f_dentry, SOCK_INODE(sock)); 3991da177e4SLinus Torvalds file->f_vfsmnt = mntget(sock_mnt); 4001da177e4SLinus Torvalds file->f_mapping = file->f_dentry->d_inode->i_mapping; 4011da177e4SLinus Torvalds 4021da177e4SLinus Torvalds sock->file = file; 4031da177e4SLinus Torvalds file->f_op = SOCK_INODE(sock)->i_fop = &socket_file_ops; 4041da177e4SLinus Torvalds file->f_mode = FMODE_READ | FMODE_WRITE; 4051da177e4SLinus Torvalds file->f_flags = O_RDWR; 4061da177e4SLinus Torvalds file->f_pos = 0; 4071da177e4SLinus Torvalds fd_install(fd, file); 4081da177e4SLinus Torvalds } 4091da177e4SLinus Torvalds 4101da177e4SLinus Torvalds out: 4111da177e4SLinus Torvalds return fd; 4121da177e4SLinus Torvalds } 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds /** 4151da177e4SLinus Torvalds * sockfd_lookup - Go from a file number to its socket slot 4161da177e4SLinus Torvalds * @fd: file handle 4171da177e4SLinus Torvalds * @err: pointer to an error code return 4181da177e4SLinus Torvalds * 4191da177e4SLinus Torvalds * The file handle passed in is locked and the socket it is bound 4201da177e4SLinus Torvalds * too is returned. If an error occurs the err pointer is overwritten 4211da177e4SLinus Torvalds * with a negative errno code and NULL is returned. The function checks 4221da177e4SLinus Torvalds * for both invalid handles and passing a handle which is not a socket. 4231da177e4SLinus Torvalds * 4241da177e4SLinus Torvalds * On a success the socket object pointer is returned. 4251da177e4SLinus Torvalds */ 4261da177e4SLinus Torvalds 4271da177e4SLinus Torvalds struct socket *sockfd_lookup(int fd, int *err) 4281da177e4SLinus Torvalds { 4291da177e4SLinus Torvalds struct file *file; 4301da177e4SLinus Torvalds struct inode *inode; 4311da177e4SLinus Torvalds struct socket *sock; 4321da177e4SLinus Torvalds 4331da177e4SLinus Torvalds if (!(file = fget(fd))) 4341da177e4SLinus Torvalds { 4351da177e4SLinus Torvalds *err = -EBADF; 4361da177e4SLinus Torvalds return NULL; 4371da177e4SLinus Torvalds } 4381da177e4SLinus Torvalds 4391da177e4SLinus Torvalds inode = file->f_dentry->d_inode; 4401da177e4SLinus Torvalds if (!S_ISSOCK(inode->i_mode)) { 4411da177e4SLinus Torvalds *err = -ENOTSOCK; 4421da177e4SLinus Torvalds fput(file); 4431da177e4SLinus Torvalds return NULL; 4441da177e4SLinus Torvalds } 4451da177e4SLinus Torvalds 4461da177e4SLinus Torvalds sock = SOCKET_I(inode); 4471da177e4SLinus Torvalds if (sock->file != file) { 4481da177e4SLinus Torvalds printk(KERN_ERR "socki_lookup: socket file changed!\n"); 4491da177e4SLinus Torvalds sock->file = file; 4501da177e4SLinus Torvalds } 4511da177e4SLinus Torvalds return sock; 4521da177e4SLinus Torvalds } 4531da177e4SLinus Torvalds 4541da177e4SLinus Torvalds /** 4551da177e4SLinus Torvalds * sock_alloc - allocate a socket 4561da177e4SLinus Torvalds * 4571da177e4SLinus Torvalds * Allocate a new inode and socket object. The two are bound together 4581da177e4SLinus Torvalds * and initialised. The socket is then returned. If we are out of inodes 4591da177e4SLinus Torvalds * NULL is returned. 4601da177e4SLinus Torvalds */ 4611da177e4SLinus Torvalds 4621da177e4SLinus Torvalds static struct socket *sock_alloc(void) 4631da177e4SLinus Torvalds { 4641da177e4SLinus Torvalds struct inode * inode; 4651da177e4SLinus Torvalds struct socket * sock; 4661da177e4SLinus Torvalds 4671da177e4SLinus Torvalds inode = new_inode(sock_mnt->mnt_sb); 4681da177e4SLinus Torvalds if (!inode) 4691da177e4SLinus Torvalds return NULL; 4701da177e4SLinus Torvalds 4711da177e4SLinus Torvalds sock = SOCKET_I(inode); 4721da177e4SLinus Torvalds 4731da177e4SLinus Torvalds inode->i_mode = S_IFSOCK|S_IRWXUGO; 4741da177e4SLinus Torvalds inode->i_uid = current->fsuid; 4751da177e4SLinus Torvalds inode->i_gid = current->fsgid; 4761da177e4SLinus Torvalds 4771da177e4SLinus Torvalds get_cpu_var(sockets_in_use)++; 4781da177e4SLinus Torvalds put_cpu_var(sockets_in_use); 4791da177e4SLinus Torvalds return sock; 4801da177e4SLinus Torvalds } 4811da177e4SLinus Torvalds 4821da177e4SLinus Torvalds /* 4831da177e4SLinus Torvalds * In theory you can't get an open on this inode, but /proc provides 4841da177e4SLinus Torvalds * a back door. Remember to keep it shut otherwise you'll let the 4851da177e4SLinus Torvalds * creepy crawlies in. 4861da177e4SLinus Torvalds */ 4871da177e4SLinus Torvalds 4881da177e4SLinus Torvalds static int sock_no_open(struct inode *irrelevant, struct file *dontcare) 4891da177e4SLinus Torvalds { 4901da177e4SLinus Torvalds return -ENXIO; 4911da177e4SLinus Torvalds } 4921da177e4SLinus Torvalds 4931da177e4SLinus Torvalds struct file_operations bad_sock_fops = { 4941da177e4SLinus Torvalds .owner = THIS_MODULE, 4951da177e4SLinus Torvalds .open = sock_no_open, 4961da177e4SLinus Torvalds }; 4971da177e4SLinus Torvalds 4981da177e4SLinus Torvalds /** 4991da177e4SLinus Torvalds * sock_release - close a socket 5001da177e4SLinus Torvalds * @sock: socket to close 5011da177e4SLinus Torvalds * 5021da177e4SLinus Torvalds * The socket is released from the protocol stack if it has a release 5031da177e4SLinus Torvalds * callback, and the inode is then released if the socket is bound to 5041da177e4SLinus Torvalds * an inode not a file. 5051da177e4SLinus Torvalds */ 5061da177e4SLinus Torvalds 5071da177e4SLinus Torvalds void sock_release(struct socket *sock) 5081da177e4SLinus Torvalds { 5091da177e4SLinus Torvalds if (sock->ops) { 5101da177e4SLinus Torvalds struct module *owner = sock->ops->owner; 5111da177e4SLinus Torvalds 5121da177e4SLinus Torvalds sock->ops->release(sock); 5131da177e4SLinus Torvalds sock->ops = NULL; 5141da177e4SLinus Torvalds module_put(owner); 5151da177e4SLinus Torvalds } 5161da177e4SLinus Torvalds 5171da177e4SLinus Torvalds if (sock->fasync_list) 5181da177e4SLinus Torvalds printk(KERN_ERR "sock_release: fasync list not empty!\n"); 5191da177e4SLinus Torvalds 5201da177e4SLinus Torvalds get_cpu_var(sockets_in_use)--; 5211da177e4SLinus Torvalds put_cpu_var(sockets_in_use); 5221da177e4SLinus Torvalds if (!sock->file) { 5231da177e4SLinus Torvalds iput(SOCK_INODE(sock)); 5241da177e4SLinus Torvalds return; 5251da177e4SLinus Torvalds } 5261da177e4SLinus Torvalds sock->file=NULL; 5271da177e4SLinus Torvalds } 5281da177e4SLinus Torvalds 5291da177e4SLinus Torvalds static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock, 5301da177e4SLinus Torvalds struct msghdr *msg, size_t size) 5311da177e4SLinus Torvalds { 5321da177e4SLinus Torvalds struct sock_iocb *si = kiocb_to_siocb(iocb); 5331da177e4SLinus Torvalds int err; 5341da177e4SLinus Torvalds 5351da177e4SLinus Torvalds si->sock = sock; 5361da177e4SLinus Torvalds si->scm = NULL; 5371da177e4SLinus Torvalds si->msg = msg; 5381da177e4SLinus Torvalds si->size = size; 5391da177e4SLinus Torvalds 5401da177e4SLinus Torvalds err = security_socket_sendmsg(sock, msg, size); 5411da177e4SLinus Torvalds if (err) 5421da177e4SLinus Torvalds return err; 5431da177e4SLinus Torvalds 5441da177e4SLinus Torvalds return sock->ops->sendmsg(iocb, sock, msg, size); 5451da177e4SLinus Torvalds } 5461da177e4SLinus Torvalds 5471da177e4SLinus Torvalds int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 5481da177e4SLinus Torvalds { 5491da177e4SLinus Torvalds struct kiocb iocb; 5501da177e4SLinus Torvalds struct sock_iocb siocb; 5511da177e4SLinus Torvalds int ret; 5521da177e4SLinus Torvalds 5531da177e4SLinus Torvalds init_sync_kiocb(&iocb, NULL); 5541da177e4SLinus Torvalds iocb.private = &siocb; 5551da177e4SLinus Torvalds ret = __sock_sendmsg(&iocb, sock, msg, size); 5561da177e4SLinus Torvalds if (-EIOCBQUEUED == ret) 5571da177e4SLinus Torvalds ret = wait_on_sync_kiocb(&iocb); 5581da177e4SLinus Torvalds return ret; 5591da177e4SLinus Torvalds } 5601da177e4SLinus Torvalds 5611da177e4SLinus Torvalds int kernel_sendmsg(struct socket *sock, struct msghdr *msg, 5621da177e4SLinus Torvalds struct kvec *vec, size_t num, size_t size) 5631da177e4SLinus Torvalds { 5641da177e4SLinus Torvalds mm_segment_t oldfs = get_fs(); 5651da177e4SLinus Torvalds int result; 5661da177e4SLinus Torvalds 5671da177e4SLinus Torvalds set_fs(KERNEL_DS); 5681da177e4SLinus Torvalds /* 5691da177e4SLinus Torvalds * the following is safe, since for compiler definitions of kvec and 5701da177e4SLinus Torvalds * iovec are identical, yielding the same in-core layout and alignment 5711da177e4SLinus Torvalds */ 5721da177e4SLinus Torvalds msg->msg_iov = (struct iovec *)vec, 5731da177e4SLinus Torvalds msg->msg_iovlen = num; 5741da177e4SLinus Torvalds result = sock_sendmsg(sock, msg, size); 5751da177e4SLinus Torvalds set_fs(oldfs); 5761da177e4SLinus Torvalds return result; 5771da177e4SLinus Torvalds } 5781da177e4SLinus Torvalds 5791da177e4SLinus Torvalds static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock, 5801da177e4SLinus Torvalds struct msghdr *msg, size_t size, int flags) 5811da177e4SLinus Torvalds { 5821da177e4SLinus Torvalds int err; 5831da177e4SLinus Torvalds struct sock_iocb *si = kiocb_to_siocb(iocb); 5841da177e4SLinus Torvalds 5851da177e4SLinus Torvalds si->sock = sock; 5861da177e4SLinus Torvalds si->scm = NULL; 5871da177e4SLinus Torvalds si->msg = msg; 5881da177e4SLinus Torvalds si->size = size; 5891da177e4SLinus Torvalds si->flags = flags; 5901da177e4SLinus Torvalds 5911da177e4SLinus Torvalds err = security_socket_recvmsg(sock, msg, size, flags); 5921da177e4SLinus Torvalds if (err) 5931da177e4SLinus Torvalds return err; 5941da177e4SLinus Torvalds 5951da177e4SLinus Torvalds return sock->ops->recvmsg(iocb, sock, msg, size, flags); 5961da177e4SLinus Torvalds } 5971da177e4SLinus Torvalds 5981da177e4SLinus Torvalds int sock_recvmsg(struct socket *sock, struct msghdr *msg, 5991da177e4SLinus Torvalds size_t size, int flags) 6001da177e4SLinus Torvalds { 6011da177e4SLinus Torvalds struct kiocb iocb; 6021da177e4SLinus Torvalds struct sock_iocb siocb; 6031da177e4SLinus Torvalds int ret; 6041da177e4SLinus Torvalds 6051da177e4SLinus Torvalds init_sync_kiocb(&iocb, NULL); 6061da177e4SLinus Torvalds iocb.private = &siocb; 6071da177e4SLinus Torvalds ret = __sock_recvmsg(&iocb, sock, msg, size, flags); 6081da177e4SLinus Torvalds if (-EIOCBQUEUED == ret) 6091da177e4SLinus Torvalds ret = wait_on_sync_kiocb(&iocb); 6101da177e4SLinus Torvalds return ret; 6111da177e4SLinus Torvalds } 6121da177e4SLinus Torvalds 6131da177e4SLinus Torvalds int kernel_recvmsg(struct socket *sock, struct msghdr *msg, 6141da177e4SLinus Torvalds struct kvec *vec, size_t num, 6151da177e4SLinus Torvalds size_t size, int flags) 6161da177e4SLinus Torvalds { 6171da177e4SLinus Torvalds mm_segment_t oldfs = get_fs(); 6181da177e4SLinus Torvalds int result; 6191da177e4SLinus Torvalds 6201da177e4SLinus Torvalds set_fs(KERNEL_DS); 6211da177e4SLinus Torvalds /* 6221da177e4SLinus Torvalds * the following is safe, since for compiler definitions of kvec and 6231da177e4SLinus Torvalds * iovec are identical, yielding the same in-core layout and alignment 6241da177e4SLinus Torvalds */ 6251da177e4SLinus Torvalds msg->msg_iov = (struct iovec *)vec, 6261da177e4SLinus Torvalds msg->msg_iovlen = num; 6271da177e4SLinus Torvalds result = sock_recvmsg(sock, msg, size, flags); 6281da177e4SLinus Torvalds set_fs(oldfs); 6291da177e4SLinus Torvalds return result; 6301da177e4SLinus Torvalds } 6311da177e4SLinus Torvalds 6321da177e4SLinus Torvalds static void sock_aio_dtor(struct kiocb *iocb) 6331da177e4SLinus Torvalds { 6341da177e4SLinus Torvalds kfree(iocb->private); 6351da177e4SLinus Torvalds } 6361da177e4SLinus Torvalds 6371da177e4SLinus Torvalds /* 6381da177e4SLinus Torvalds * Read data from a socket. ubuf is a user mode pointer. We make sure the user 6391da177e4SLinus Torvalds * area ubuf...ubuf+size-1 is writable before asking the protocol. 6401da177e4SLinus Torvalds */ 6411da177e4SLinus Torvalds 6421da177e4SLinus Torvalds static ssize_t sock_aio_read(struct kiocb *iocb, char __user *ubuf, 6431da177e4SLinus Torvalds size_t size, loff_t pos) 6441da177e4SLinus Torvalds { 6451da177e4SLinus Torvalds struct sock_iocb *x, siocb; 6461da177e4SLinus Torvalds struct socket *sock; 6471da177e4SLinus Torvalds int flags; 6481da177e4SLinus Torvalds 6491da177e4SLinus Torvalds if (pos != 0) 6501da177e4SLinus Torvalds return -ESPIPE; 6511da177e4SLinus Torvalds if (size==0) /* Match SYS5 behaviour */ 6521da177e4SLinus Torvalds return 0; 6531da177e4SLinus Torvalds 6541da177e4SLinus Torvalds if (is_sync_kiocb(iocb)) 6551da177e4SLinus Torvalds x = &siocb; 6561da177e4SLinus Torvalds else { 6571da177e4SLinus Torvalds x = kmalloc(sizeof(struct sock_iocb), GFP_KERNEL); 6581da177e4SLinus Torvalds if (!x) 6591da177e4SLinus Torvalds return -ENOMEM; 6601da177e4SLinus Torvalds iocb->ki_dtor = sock_aio_dtor; 6611da177e4SLinus Torvalds } 6621da177e4SLinus Torvalds iocb->private = x; 6631da177e4SLinus Torvalds x->kiocb = iocb; 6641da177e4SLinus Torvalds sock = SOCKET_I(iocb->ki_filp->f_dentry->d_inode); 6651da177e4SLinus Torvalds 6661da177e4SLinus Torvalds x->async_msg.msg_name = NULL; 6671da177e4SLinus Torvalds x->async_msg.msg_namelen = 0; 6681da177e4SLinus Torvalds x->async_msg.msg_iov = &x->async_iov; 6691da177e4SLinus Torvalds x->async_msg.msg_iovlen = 1; 6701da177e4SLinus Torvalds x->async_msg.msg_control = NULL; 6711da177e4SLinus Torvalds x->async_msg.msg_controllen = 0; 6721da177e4SLinus Torvalds x->async_iov.iov_base = ubuf; 6731da177e4SLinus Torvalds x->async_iov.iov_len = size; 6741da177e4SLinus Torvalds flags = !(iocb->ki_filp->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; 6751da177e4SLinus Torvalds 6761da177e4SLinus Torvalds return __sock_recvmsg(iocb, sock, &x->async_msg, size, flags); 6771da177e4SLinus Torvalds } 6781da177e4SLinus Torvalds 6791da177e4SLinus Torvalds 6801da177e4SLinus Torvalds /* 6811da177e4SLinus Torvalds * Write data to a socket. We verify that the user area ubuf..ubuf+size-1 6821da177e4SLinus Torvalds * is readable by the user process. 6831da177e4SLinus Torvalds */ 6841da177e4SLinus Torvalds 6851da177e4SLinus Torvalds static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *ubuf, 6861da177e4SLinus Torvalds size_t size, loff_t pos) 6871da177e4SLinus Torvalds { 6881da177e4SLinus Torvalds struct sock_iocb *x, siocb; 6891da177e4SLinus Torvalds struct socket *sock; 6901da177e4SLinus Torvalds 6911da177e4SLinus Torvalds if (pos != 0) 6921da177e4SLinus Torvalds return -ESPIPE; 6931da177e4SLinus Torvalds if(size==0) /* Match SYS5 behaviour */ 6941da177e4SLinus Torvalds return 0; 6951da177e4SLinus Torvalds 6961da177e4SLinus Torvalds if (is_sync_kiocb(iocb)) 6971da177e4SLinus Torvalds x = &siocb; 6981da177e4SLinus Torvalds else { 6991da177e4SLinus Torvalds x = kmalloc(sizeof(struct sock_iocb), GFP_KERNEL); 7001da177e4SLinus Torvalds if (!x) 7011da177e4SLinus Torvalds return -ENOMEM; 7021da177e4SLinus Torvalds iocb->ki_dtor = sock_aio_dtor; 7031da177e4SLinus Torvalds } 7041da177e4SLinus Torvalds iocb->private = x; 7051da177e4SLinus Torvalds x->kiocb = iocb; 7061da177e4SLinus Torvalds sock = SOCKET_I(iocb->ki_filp->f_dentry->d_inode); 7071da177e4SLinus Torvalds 7081da177e4SLinus Torvalds x->async_msg.msg_name = NULL; 7091da177e4SLinus Torvalds x->async_msg.msg_namelen = 0; 7101da177e4SLinus Torvalds x->async_msg.msg_iov = &x->async_iov; 7111da177e4SLinus Torvalds x->async_msg.msg_iovlen = 1; 7121da177e4SLinus Torvalds x->async_msg.msg_control = NULL; 7131da177e4SLinus Torvalds x->async_msg.msg_controllen = 0; 7141da177e4SLinus Torvalds x->async_msg.msg_flags = !(iocb->ki_filp->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; 7151da177e4SLinus Torvalds if (sock->type == SOCK_SEQPACKET) 7161da177e4SLinus Torvalds x->async_msg.msg_flags |= MSG_EOR; 7171da177e4SLinus Torvalds x->async_iov.iov_base = (void __user *)ubuf; 7181da177e4SLinus Torvalds x->async_iov.iov_len = size; 7191da177e4SLinus Torvalds 7201da177e4SLinus Torvalds return __sock_sendmsg(iocb, sock, &x->async_msg, size); 7211da177e4SLinus Torvalds } 7221da177e4SLinus Torvalds 7231da177e4SLinus Torvalds ssize_t sock_sendpage(struct file *file, struct page *page, 7241da177e4SLinus Torvalds int offset, size_t size, loff_t *ppos, int more) 7251da177e4SLinus Torvalds { 7261da177e4SLinus Torvalds struct socket *sock; 7271da177e4SLinus Torvalds int flags; 7281da177e4SLinus Torvalds 7291da177e4SLinus Torvalds sock = SOCKET_I(file->f_dentry->d_inode); 7301da177e4SLinus Torvalds 7311da177e4SLinus Torvalds flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; 7321da177e4SLinus Torvalds if (more) 7331da177e4SLinus Torvalds flags |= MSG_MORE; 7341da177e4SLinus Torvalds 7351da177e4SLinus Torvalds return sock->ops->sendpage(sock, page, offset, size, flags); 7361da177e4SLinus Torvalds } 7371da177e4SLinus Torvalds 7381da177e4SLinus Torvalds static int sock_readv_writev(int type, struct inode * inode, 7391da177e4SLinus Torvalds struct file * file, const struct iovec * iov, 7401da177e4SLinus Torvalds long count, size_t size) 7411da177e4SLinus Torvalds { 7421da177e4SLinus Torvalds struct msghdr msg; 7431da177e4SLinus Torvalds struct socket *sock; 7441da177e4SLinus Torvalds 7451da177e4SLinus Torvalds sock = SOCKET_I(inode); 7461da177e4SLinus Torvalds 7471da177e4SLinus Torvalds msg.msg_name = NULL; 7481da177e4SLinus Torvalds msg.msg_namelen = 0; 7491da177e4SLinus Torvalds msg.msg_control = NULL; 7501da177e4SLinus Torvalds msg.msg_controllen = 0; 7511da177e4SLinus Torvalds msg.msg_iov = (struct iovec *) iov; 7521da177e4SLinus Torvalds msg.msg_iovlen = count; 7531da177e4SLinus Torvalds msg.msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; 7541da177e4SLinus Torvalds 7551da177e4SLinus Torvalds /* read() does a VERIFY_WRITE */ 7561da177e4SLinus Torvalds if (type == VERIFY_WRITE) 7571da177e4SLinus Torvalds return sock_recvmsg(sock, &msg, size, msg.msg_flags); 7581da177e4SLinus Torvalds 7591da177e4SLinus Torvalds if (sock->type == SOCK_SEQPACKET) 7601da177e4SLinus Torvalds msg.msg_flags |= MSG_EOR; 7611da177e4SLinus Torvalds 7621da177e4SLinus Torvalds return sock_sendmsg(sock, &msg, size); 7631da177e4SLinus Torvalds } 7641da177e4SLinus Torvalds 7651da177e4SLinus Torvalds static ssize_t sock_readv(struct file *file, const struct iovec *vector, 7661da177e4SLinus Torvalds unsigned long count, loff_t *ppos) 7671da177e4SLinus Torvalds { 7681da177e4SLinus Torvalds size_t tot_len = 0; 7691da177e4SLinus Torvalds int i; 7701da177e4SLinus Torvalds for (i = 0 ; i < count ; i++) 7711da177e4SLinus Torvalds tot_len += vector[i].iov_len; 7721da177e4SLinus Torvalds return sock_readv_writev(VERIFY_WRITE, file->f_dentry->d_inode, 7731da177e4SLinus Torvalds file, vector, count, tot_len); 7741da177e4SLinus Torvalds } 7751da177e4SLinus Torvalds 7761da177e4SLinus Torvalds static ssize_t sock_writev(struct file *file, const struct iovec *vector, 7771da177e4SLinus Torvalds unsigned long count, loff_t *ppos) 7781da177e4SLinus Torvalds { 7791da177e4SLinus Torvalds size_t tot_len = 0; 7801da177e4SLinus Torvalds int i; 7811da177e4SLinus Torvalds for (i = 0 ; i < count ; i++) 7821da177e4SLinus Torvalds tot_len += vector[i].iov_len; 7831da177e4SLinus Torvalds return sock_readv_writev(VERIFY_READ, file->f_dentry->d_inode, 7841da177e4SLinus Torvalds file, vector, count, tot_len); 7851da177e4SLinus Torvalds } 7861da177e4SLinus Torvalds 7871da177e4SLinus Torvalds 7881da177e4SLinus Torvalds /* 7891da177e4SLinus Torvalds * Atomic setting of ioctl hooks to avoid race 7901da177e4SLinus Torvalds * with module unload. 7911da177e4SLinus Torvalds */ 7921da177e4SLinus Torvalds 7931da177e4SLinus Torvalds static DECLARE_MUTEX(br_ioctl_mutex); 7941da177e4SLinus Torvalds static int (*br_ioctl_hook)(unsigned int cmd, void __user *arg) = NULL; 7951da177e4SLinus Torvalds 7961da177e4SLinus Torvalds void brioctl_set(int (*hook)(unsigned int, void __user *)) 7971da177e4SLinus Torvalds { 7981da177e4SLinus Torvalds down(&br_ioctl_mutex); 7991da177e4SLinus Torvalds br_ioctl_hook = hook; 8001da177e4SLinus Torvalds up(&br_ioctl_mutex); 8011da177e4SLinus Torvalds } 8021da177e4SLinus Torvalds EXPORT_SYMBOL(brioctl_set); 8031da177e4SLinus Torvalds 8041da177e4SLinus Torvalds static DECLARE_MUTEX(vlan_ioctl_mutex); 8051da177e4SLinus Torvalds static int (*vlan_ioctl_hook)(void __user *arg); 8061da177e4SLinus Torvalds 8071da177e4SLinus Torvalds void vlan_ioctl_set(int (*hook)(void __user *)) 8081da177e4SLinus Torvalds { 8091da177e4SLinus Torvalds down(&vlan_ioctl_mutex); 8101da177e4SLinus Torvalds vlan_ioctl_hook = hook; 8111da177e4SLinus Torvalds up(&vlan_ioctl_mutex); 8121da177e4SLinus Torvalds } 8131da177e4SLinus Torvalds EXPORT_SYMBOL(vlan_ioctl_set); 8141da177e4SLinus Torvalds 8151da177e4SLinus Torvalds static DECLARE_MUTEX(dlci_ioctl_mutex); 8161da177e4SLinus Torvalds static int (*dlci_ioctl_hook)(unsigned int, void __user *); 8171da177e4SLinus Torvalds 8181da177e4SLinus Torvalds void dlci_ioctl_set(int (*hook)(unsigned int, void __user *)) 8191da177e4SLinus Torvalds { 8201da177e4SLinus Torvalds down(&dlci_ioctl_mutex); 8211da177e4SLinus Torvalds dlci_ioctl_hook = hook; 8221da177e4SLinus Torvalds up(&dlci_ioctl_mutex); 8231da177e4SLinus Torvalds } 8241da177e4SLinus Torvalds EXPORT_SYMBOL(dlci_ioctl_set); 8251da177e4SLinus Torvalds 8261da177e4SLinus Torvalds /* 8271da177e4SLinus Torvalds * With an ioctl, arg may well be a user mode pointer, but we don't know 8281da177e4SLinus Torvalds * what to do with it - that's up to the protocol still. 8291da177e4SLinus Torvalds */ 8301da177e4SLinus Torvalds 8311da177e4SLinus Torvalds static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) 8321da177e4SLinus Torvalds { 8331da177e4SLinus Torvalds struct socket *sock; 8341da177e4SLinus Torvalds void __user *argp = (void __user *)arg; 8351da177e4SLinus Torvalds int pid, err; 8361da177e4SLinus Torvalds 8371da177e4SLinus Torvalds sock = SOCKET_I(file->f_dentry->d_inode); 8381da177e4SLinus Torvalds if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { 8391da177e4SLinus Torvalds err = dev_ioctl(cmd, argp); 8401da177e4SLinus Torvalds } else 8411da177e4SLinus Torvalds #ifdef WIRELESS_EXT 8421da177e4SLinus Torvalds if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { 8431da177e4SLinus Torvalds err = dev_ioctl(cmd, argp); 8441da177e4SLinus Torvalds } else 8451da177e4SLinus Torvalds #endif /* WIRELESS_EXT */ 8461da177e4SLinus Torvalds switch (cmd) { 8471da177e4SLinus Torvalds case FIOSETOWN: 8481da177e4SLinus Torvalds case SIOCSPGRP: 8491da177e4SLinus Torvalds err = -EFAULT; 8501da177e4SLinus Torvalds if (get_user(pid, (int __user *)argp)) 8511da177e4SLinus Torvalds break; 8521da177e4SLinus Torvalds err = f_setown(sock->file, pid, 1); 8531da177e4SLinus Torvalds break; 8541da177e4SLinus Torvalds case FIOGETOWN: 8551da177e4SLinus Torvalds case SIOCGPGRP: 8561da177e4SLinus Torvalds err = put_user(sock->file->f_owner.pid, (int __user *)argp); 8571da177e4SLinus Torvalds break; 8581da177e4SLinus Torvalds case SIOCGIFBR: 8591da177e4SLinus Torvalds case SIOCSIFBR: 8601da177e4SLinus Torvalds case SIOCBRADDBR: 8611da177e4SLinus Torvalds case SIOCBRDELBR: 8621da177e4SLinus Torvalds err = -ENOPKG; 8631da177e4SLinus Torvalds if (!br_ioctl_hook) 8641da177e4SLinus Torvalds request_module("bridge"); 8651da177e4SLinus Torvalds 8661da177e4SLinus Torvalds down(&br_ioctl_mutex); 8671da177e4SLinus Torvalds if (br_ioctl_hook) 8681da177e4SLinus Torvalds err = br_ioctl_hook(cmd, argp); 8691da177e4SLinus Torvalds up(&br_ioctl_mutex); 8701da177e4SLinus Torvalds break; 8711da177e4SLinus Torvalds case SIOCGIFVLAN: 8721da177e4SLinus Torvalds case SIOCSIFVLAN: 8731da177e4SLinus Torvalds err = -ENOPKG; 8741da177e4SLinus Torvalds if (!vlan_ioctl_hook) 8751da177e4SLinus Torvalds request_module("8021q"); 8761da177e4SLinus Torvalds 8771da177e4SLinus Torvalds down(&vlan_ioctl_mutex); 8781da177e4SLinus Torvalds if (vlan_ioctl_hook) 8791da177e4SLinus Torvalds err = vlan_ioctl_hook(argp); 8801da177e4SLinus Torvalds up(&vlan_ioctl_mutex); 8811da177e4SLinus Torvalds break; 8821da177e4SLinus Torvalds case SIOCGIFDIVERT: 8831da177e4SLinus Torvalds case SIOCSIFDIVERT: 8841da177e4SLinus Torvalds /* Convert this to call through a hook */ 8851da177e4SLinus Torvalds err = divert_ioctl(cmd, argp); 8861da177e4SLinus Torvalds break; 8871da177e4SLinus Torvalds case SIOCADDDLCI: 8881da177e4SLinus Torvalds case SIOCDELDLCI: 8891da177e4SLinus Torvalds err = -ENOPKG; 8901da177e4SLinus Torvalds if (!dlci_ioctl_hook) 8911da177e4SLinus Torvalds request_module("dlci"); 8921da177e4SLinus Torvalds 8931da177e4SLinus Torvalds if (dlci_ioctl_hook) { 8941da177e4SLinus Torvalds down(&dlci_ioctl_mutex); 8951da177e4SLinus Torvalds err = dlci_ioctl_hook(cmd, argp); 8961da177e4SLinus Torvalds up(&dlci_ioctl_mutex); 8971da177e4SLinus Torvalds } 8981da177e4SLinus Torvalds break; 8991da177e4SLinus Torvalds default: 9001da177e4SLinus Torvalds err = sock->ops->ioctl(sock, cmd, arg); 9011da177e4SLinus Torvalds break; 9021da177e4SLinus Torvalds } 9031da177e4SLinus Torvalds return err; 9041da177e4SLinus Torvalds } 9051da177e4SLinus Torvalds 9061da177e4SLinus Torvalds int sock_create_lite(int family, int type, int protocol, struct socket **res) 9071da177e4SLinus Torvalds { 9081da177e4SLinus Torvalds int err; 9091da177e4SLinus Torvalds struct socket *sock = NULL; 9101da177e4SLinus Torvalds 9111da177e4SLinus Torvalds err = security_socket_create(family, type, protocol, 1); 9121da177e4SLinus Torvalds if (err) 9131da177e4SLinus Torvalds goto out; 9141da177e4SLinus Torvalds 9151da177e4SLinus Torvalds sock = sock_alloc(); 9161da177e4SLinus Torvalds if (!sock) { 9171da177e4SLinus Torvalds err = -ENOMEM; 9181da177e4SLinus Torvalds goto out; 9191da177e4SLinus Torvalds } 9201da177e4SLinus Torvalds 9211da177e4SLinus Torvalds security_socket_post_create(sock, family, type, protocol, 1); 9221da177e4SLinus Torvalds sock->type = type; 9231da177e4SLinus Torvalds out: 9241da177e4SLinus Torvalds *res = sock; 9251da177e4SLinus Torvalds return err; 9261da177e4SLinus Torvalds } 9271da177e4SLinus Torvalds 9281da177e4SLinus Torvalds /* No kernel lock held - perfect */ 9291da177e4SLinus Torvalds static unsigned int sock_poll(struct file *file, poll_table * wait) 9301da177e4SLinus Torvalds { 9311da177e4SLinus Torvalds struct socket *sock; 9321da177e4SLinus Torvalds 9331da177e4SLinus Torvalds /* 9341da177e4SLinus Torvalds * We can't return errors to poll, so it's either yes or no. 9351da177e4SLinus Torvalds */ 9361da177e4SLinus Torvalds sock = SOCKET_I(file->f_dentry->d_inode); 9371da177e4SLinus Torvalds return sock->ops->poll(file, sock, wait); 9381da177e4SLinus Torvalds } 9391da177e4SLinus Torvalds 9401da177e4SLinus Torvalds static int sock_mmap(struct file * file, struct vm_area_struct * vma) 9411da177e4SLinus Torvalds { 9421da177e4SLinus Torvalds struct socket *sock = SOCKET_I(file->f_dentry->d_inode); 9431da177e4SLinus Torvalds 9441da177e4SLinus Torvalds return sock->ops->mmap(file, sock, vma); 9451da177e4SLinus Torvalds } 9461da177e4SLinus Torvalds 9471da177e4SLinus Torvalds int sock_close(struct inode *inode, struct file *filp) 9481da177e4SLinus Torvalds { 9491da177e4SLinus Torvalds /* 9501da177e4SLinus Torvalds * It was possible the inode is NULL we were 9511da177e4SLinus Torvalds * closing an unfinished socket. 9521da177e4SLinus Torvalds */ 9531da177e4SLinus Torvalds 9541da177e4SLinus Torvalds if (!inode) 9551da177e4SLinus Torvalds { 9561da177e4SLinus Torvalds printk(KERN_DEBUG "sock_close: NULL inode\n"); 9571da177e4SLinus Torvalds return 0; 9581da177e4SLinus Torvalds } 9591da177e4SLinus Torvalds sock_fasync(-1, filp, 0); 9601da177e4SLinus Torvalds sock_release(SOCKET_I(inode)); 9611da177e4SLinus Torvalds return 0; 9621da177e4SLinus Torvalds } 9631da177e4SLinus Torvalds 9641da177e4SLinus Torvalds /* 9651da177e4SLinus Torvalds * Update the socket async list 9661da177e4SLinus Torvalds * 9671da177e4SLinus Torvalds * Fasync_list locking strategy. 9681da177e4SLinus Torvalds * 9691da177e4SLinus Torvalds * 1. fasync_list is modified only under process context socket lock 9701da177e4SLinus Torvalds * i.e. under semaphore. 9711da177e4SLinus Torvalds * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) 9721da177e4SLinus Torvalds * or under socket lock. 9731da177e4SLinus Torvalds * 3. fasync_list can be used from softirq context, so that 9741da177e4SLinus Torvalds * modification under socket lock have to be enhanced with 9751da177e4SLinus Torvalds * write_lock_bh(&sk->sk_callback_lock). 9761da177e4SLinus Torvalds * --ANK (990710) 9771da177e4SLinus Torvalds */ 9781da177e4SLinus Torvalds 9791da177e4SLinus Torvalds static int sock_fasync(int fd, struct file *filp, int on) 9801da177e4SLinus Torvalds { 9811da177e4SLinus Torvalds struct fasync_struct *fa, *fna=NULL, **prev; 9821da177e4SLinus Torvalds struct socket *sock; 9831da177e4SLinus Torvalds struct sock *sk; 9841da177e4SLinus Torvalds 9851da177e4SLinus Torvalds if (on) 9861da177e4SLinus Torvalds { 9871da177e4SLinus Torvalds fna=(struct fasync_struct *)kmalloc(sizeof(struct fasync_struct), GFP_KERNEL); 9881da177e4SLinus Torvalds if(fna==NULL) 9891da177e4SLinus Torvalds return -ENOMEM; 9901da177e4SLinus Torvalds } 9911da177e4SLinus Torvalds 9921da177e4SLinus Torvalds sock = SOCKET_I(filp->f_dentry->d_inode); 9931da177e4SLinus Torvalds 9941da177e4SLinus Torvalds if ((sk=sock->sk) == NULL) { 9951da177e4SLinus Torvalds kfree(fna); 9961da177e4SLinus Torvalds return -EINVAL; 9971da177e4SLinus Torvalds } 9981da177e4SLinus Torvalds 9991da177e4SLinus Torvalds lock_sock(sk); 10001da177e4SLinus Torvalds 10011da177e4SLinus Torvalds prev=&(sock->fasync_list); 10021da177e4SLinus Torvalds 10031da177e4SLinus Torvalds for (fa=*prev; fa!=NULL; prev=&fa->fa_next,fa=*prev) 10041da177e4SLinus Torvalds if (fa->fa_file==filp) 10051da177e4SLinus Torvalds break; 10061da177e4SLinus Torvalds 10071da177e4SLinus Torvalds if(on) 10081da177e4SLinus Torvalds { 10091da177e4SLinus Torvalds if(fa!=NULL) 10101da177e4SLinus Torvalds { 10111da177e4SLinus Torvalds write_lock_bh(&sk->sk_callback_lock); 10121da177e4SLinus Torvalds fa->fa_fd=fd; 10131da177e4SLinus Torvalds write_unlock_bh(&sk->sk_callback_lock); 10141da177e4SLinus Torvalds 10151da177e4SLinus Torvalds kfree(fna); 10161da177e4SLinus Torvalds goto out; 10171da177e4SLinus Torvalds } 10181da177e4SLinus Torvalds fna->fa_file=filp; 10191da177e4SLinus Torvalds fna->fa_fd=fd; 10201da177e4SLinus Torvalds fna->magic=FASYNC_MAGIC; 10211da177e4SLinus Torvalds fna->fa_next=sock->fasync_list; 10221da177e4SLinus Torvalds write_lock_bh(&sk->sk_callback_lock); 10231da177e4SLinus Torvalds sock->fasync_list=fna; 10241da177e4SLinus Torvalds write_unlock_bh(&sk->sk_callback_lock); 10251da177e4SLinus Torvalds } 10261da177e4SLinus Torvalds else 10271da177e4SLinus Torvalds { 10281da177e4SLinus Torvalds if (fa!=NULL) 10291da177e4SLinus Torvalds { 10301da177e4SLinus Torvalds write_lock_bh(&sk->sk_callback_lock); 10311da177e4SLinus Torvalds *prev=fa->fa_next; 10321da177e4SLinus Torvalds write_unlock_bh(&sk->sk_callback_lock); 10331da177e4SLinus Torvalds kfree(fa); 10341da177e4SLinus Torvalds } 10351da177e4SLinus Torvalds } 10361da177e4SLinus Torvalds 10371da177e4SLinus Torvalds out: 10381da177e4SLinus Torvalds release_sock(sock->sk); 10391da177e4SLinus Torvalds return 0; 10401da177e4SLinus Torvalds } 10411da177e4SLinus Torvalds 10421da177e4SLinus Torvalds /* This function may be called only under socket lock or callback_lock */ 10431da177e4SLinus Torvalds 10441da177e4SLinus Torvalds int sock_wake_async(struct socket *sock, int how, int band) 10451da177e4SLinus Torvalds { 10461da177e4SLinus Torvalds if (!sock || !sock->fasync_list) 10471da177e4SLinus Torvalds return -1; 10481da177e4SLinus Torvalds switch (how) 10491da177e4SLinus Torvalds { 10501da177e4SLinus Torvalds case 1: 10511da177e4SLinus Torvalds 10521da177e4SLinus Torvalds if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags)) 10531da177e4SLinus Torvalds break; 10541da177e4SLinus Torvalds goto call_kill; 10551da177e4SLinus Torvalds case 2: 10561da177e4SLinus Torvalds if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags)) 10571da177e4SLinus Torvalds break; 10581da177e4SLinus Torvalds /* fall through */ 10591da177e4SLinus Torvalds case 0: 10601da177e4SLinus Torvalds call_kill: 10611da177e4SLinus Torvalds __kill_fasync(sock->fasync_list, SIGIO, band); 10621da177e4SLinus Torvalds break; 10631da177e4SLinus Torvalds case 3: 10641da177e4SLinus Torvalds __kill_fasync(sock->fasync_list, SIGURG, band); 10651da177e4SLinus Torvalds } 10661da177e4SLinus Torvalds return 0; 10671da177e4SLinus Torvalds } 10681da177e4SLinus Torvalds 10691da177e4SLinus Torvalds static int __sock_create(int family, int type, int protocol, struct socket **res, int kern) 10701da177e4SLinus Torvalds { 10711da177e4SLinus Torvalds int err; 10721da177e4SLinus Torvalds struct socket *sock; 10731da177e4SLinus Torvalds 10741da177e4SLinus Torvalds /* 10751da177e4SLinus Torvalds * Check protocol is in range 10761da177e4SLinus Torvalds */ 10771da177e4SLinus Torvalds if (family < 0 || family >= NPROTO) 10781da177e4SLinus Torvalds return -EAFNOSUPPORT; 10791da177e4SLinus Torvalds if (type < 0 || type >= SOCK_MAX) 10801da177e4SLinus Torvalds return -EINVAL; 10811da177e4SLinus Torvalds 10821da177e4SLinus Torvalds /* Compatibility. 10831da177e4SLinus Torvalds 10841da177e4SLinus Torvalds This uglymoron is moved from INET layer to here to avoid 10851da177e4SLinus Torvalds deadlock in module load. 10861da177e4SLinus Torvalds */ 10871da177e4SLinus Torvalds if (family == PF_INET && type == SOCK_PACKET) { 10881da177e4SLinus Torvalds static int warned; 10891da177e4SLinus Torvalds if (!warned) { 10901da177e4SLinus Torvalds warned = 1; 10911da177e4SLinus Torvalds printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n", current->comm); 10921da177e4SLinus Torvalds } 10931da177e4SLinus Torvalds family = PF_PACKET; 10941da177e4SLinus Torvalds } 10951da177e4SLinus Torvalds 10961da177e4SLinus Torvalds err = security_socket_create(family, type, protocol, kern); 10971da177e4SLinus Torvalds if (err) 10981da177e4SLinus Torvalds return err; 10991da177e4SLinus Torvalds 11001da177e4SLinus Torvalds #if defined(CONFIG_KMOD) 11011da177e4SLinus Torvalds /* Attempt to load a protocol module if the find failed. 11021da177e4SLinus Torvalds * 11031da177e4SLinus Torvalds * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user 11041da177e4SLinus Torvalds * requested real, full-featured networking support upon configuration. 11051da177e4SLinus Torvalds * Otherwise module support will break! 11061da177e4SLinus Torvalds */ 11071da177e4SLinus Torvalds if (net_families[family]==NULL) 11081da177e4SLinus Torvalds { 11091da177e4SLinus Torvalds request_module("net-pf-%d",family); 11101da177e4SLinus Torvalds } 11111da177e4SLinus Torvalds #endif 11121da177e4SLinus Torvalds 11131da177e4SLinus Torvalds net_family_read_lock(); 11141da177e4SLinus Torvalds if (net_families[family] == NULL) { 11151da177e4SLinus Torvalds err = -EAFNOSUPPORT; 11161da177e4SLinus Torvalds goto out; 11171da177e4SLinus Torvalds } 11181da177e4SLinus Torvalds 11191da177e4SLinus Torvalds /* 11201da177e4SLinus Torvalds * Allocate the socket and allow the family to set things up. if 11211da177e4SLinus Torvalds * the protocol is 0, the family is instructed to select an appropriate 11221da177e4SLinus Torvalds * default. 11231da177e4SLinus Torvalds */ 11241da177e4SLinus Torvalds 11251da177e4SLinus Torvalds if (!(sock = sock_alloc())) { 11261da177e4SLinus Torvalds printk(KERN_WARNING "socket: no more sockets\n"); 11271da177e4SLinus Torvalds err = -ENFILE; /* Not exactly a match, but its the 11281da177e4SLinus Torvalds closest posix thing */ 11291da177e4SLinus Torvalds goto out; 11301da177e4SLinus Torvalds } 11311da177e4SLinus Torvalds 11321da177e4SLinus Torvalds sock->type = type; 11331da177e4SLinus Torvalds 11341da177e4SLinus Torvalds /* 11351da177e4SLinus Torvalds * We will call the ->create function, that possibly is in a loadable 11361da177e4SLinus Torvalds * module, so we have to bump that loadable module refcnt first. 11371da177e4SLinus Torvalds */ 11381da177e4SLinus Torvalds err = -EAFNOSUPPORT; 11391da177e4SLinus Torvalds if (!try_module_get(net_families[family]->owner)) 11401da177e4SLinus Torvalds goto out_release; 11411da177e4SLinus Torvalds 11421da177e4SLinus Torvalds if ((err = net_families[family]->create(sock, protocol)) < 0) 11431da177e4SLinus Torvalds goto out_module_put; 11441da177e4SLinus Torvalds /* 11451da177e4SLinus Torvalds * Now to bump the refcnt of the [loadable] module that owns this 11461da177e4SLinus Torvalds * socket at sock_release time we decrement its refcnt. 11471da177e4SLinus Torvalds */ 11481da177e4SLinus Torvalds if (!try_module_get(sock->ops->owner)) { 11491da177e4SLinus Torvalds sock->ops = NULL; 11501da177e4SLinus Torvalds goto out_module_put; 11511da177e4SLinus Torvalds } 11521da177e4SLinus Torvalds /* 11531da177e4SLinus Torvalds * Now that we're done with the ->create function, the [loadable] 11541da177e4SLinus Torvalds * module can have its refcnt decremented 11551da177e4SLinus Torvalds */ 11561da177e4SLinus Torvalds module_put(net_families[family]->owner); 11571da177e4SLinus Torvalds *res = sock; 11581da177e4SLinus Torvalds security_socket_post_create(sock, family, type, protocol, kern); 11591da177e4SLinus Torvalds 11601da177e4SLinus Torvalds out: 11611da177e4SLinus Torvalds net_family_read_unlock(); 11621da177e4SLinus Torvalds return err; 11631da177e4SLinus Torvalds out_module_put: 11641da177e4SLinus Torvalds module_put(net_families[family]->owner); 11651da177e4SLinus Torvalds out_release: 11661da177e4SLinus Torvalds sock_release(sock); 11671da177e4SLinus Torvalds goto out; 11681da177e4SLinus Torvalds } 11691da177e4SLinus Torvalds 11701da177e4SLinus Torvalds int sock_create(int family, int type, int protocol, struct socket **res) 11711da177e4SLinus Torvalds { 11721da177e4SLinus Torvalds return __sock_create(family, type, protocol, res, 0); 11731da177e4SLinus Torvalds } 11741da177e4SLinus Torvalds 11751da177e4SLinus Torvalds int sock_create_kern(int family, int type, int protocol, struct socket **res) 11761da177e4SLinus Torvalds { 11771da177e4SLinus Torvalds return __sock_create(family, type, protocol, res, 1); 11781da177e4SLinus Torvalds } 11791da177e4SLinus Torvalds 11801da177e4SLinus Torvalds asmlinkage long sys_socket(int family, int type, int protocol) 11811da177e4SLinus Torvalds { 11821da177e4SLinus Torvalds int retval; 11831da177e4SLinus Torvalds struct socket *sock; 11841da177e4SLinus Torvalds 11851da177e4SLinus Torvalds retval = sock_create(family, type, protocol, &sock); 11861da177e4SLinus Torvalds if (retval < 0) 11871da177e4SLinus Torvalds goto out; 11881da177e4SLinus Torvalds 11891da177e4SLinus Torvalds retval = sock_map_fd(sock); 11901da177e4SLinus Torvalds if (retval < 0) 11911da177e4SLinus Torvalds goto out_release; 11921da177e4SLinus Torvalds 11931da177e4SLinus Torvalds out: 11941da177e4SLinus Torvalds /* It may be already another descriptor 8) Not kernel problem. */ 11951da177e4SLinus Torvalds return retval; 11961da177e4SLinus Torvalds 11971da177e4SLinus Torvalds out_release: 11981da177e4SLinus Torvalds sock_release(sock); 11991da177e4SLinus Torvalds return retval; 12001da177e4SLinus Torvalds } 12011da177e4SLinus Torvalds 12021da177e4SLinus Torvalds /* 12031da177e4SLinus Torvalds * Create a pair of connected sockets. 12041da177e4SLinus Torvalds */ 12051da177e4SLinus Torvalds 12061da177e4SLinus Torvalds asmlinkage long sys_socketpair(int family, int type, int protocol, int __user *usockvec) 12071da177e4SLinus Torvalds { 12081da177e4SLinus Torvalds struct socket *sock1, *sock2; 12091da177e4SLinus Torvalds int fd1, fd2, err; 12101da177e4SLinus Torvalds 12111da177e4SLinus Torvalds /* 12121da177e4SLinus Torvalds * Obtain the first socket and check if the underlying protocol 12131da177e4SLinus Torvalds * supports the socketpair call. 12141da177e4SLinus Torvalds */ 12151da177e4SLinus Torvalds 12161da177e4SLinus Torvalds err = sock_create(family, type, protocol, &sock1); 12171da177e4SLinus Torvalds if (err < 0) 12181da177e4SLinus Torvalds goto out; 12191da177e4SLinus Torvalds 12201da177e4SLinus Torvalds err = sock_create(family, type, protocol, &sock2); 12211da177e4SLinus Torvalds if (err < 0) 12221da177e4SLinus Torvalds goto out_release_1; 12231da177e4SLinus Torvalds 12241da177e4SLinus Torvalds err = sock1->ops->socketpair(sock1, sock2); 12251da177e4SLinus Torvalds if (err < 0) 12261da177e4SLinus Torvalds goto out_release_both; 12271da177e4SLinus Torvalds 12281da177e4SLinus Torvalds fd1 = fd2 = -1; 12291da177e4SLinus Torvalds 12301da177e4SLinus Torvalds err = sock_map_fd(sock1); 12311da177e4SLinus Torvalds if (err < 0) 12321da177e4SLinus Torvalds goto out_release_both; 12331da177e4SLinus Torvalds fd1 = err; 12341da177e4SLinus Torvalds 12351da177e4SLinus Torvalds err = sock_map_fd(sock2); 12361da177e4SLinus Torvalds if (err < 0) 12371da177e4SLinus Torvalds goto out_close_1; 12381da177e4SLinus Torvalds fd2 = err; 12391da177e4SLinus Torvalds 12401da177e4SLinus Torvalds /* fd1 and fd2 may be already another descriptors. 12411da177e4SLinus Torvalds * Not kernel problem. 12421da177e4SLinus Torvalds */ 12431da177e4SLinus Torvalds 12441da177e4SLinus Torvalds err = put_user(fd1, &usockvec[0]); 12451da177e4SLinus Torvalds if (!err) 12461da177e4SLinus Torvalds err = put_user(fd2, &usockvec[1]); 12471da177e4SLinus Torvalds if (!err) 12481da177e4SLinus Torvalds return 0; 12491da177e4SLinus Torvalds 12501da177e4SLinus Torvalds sys_close(fd2); 12511da177e4SLinus Torvalds sys_close(fd1); 12521da177e4SLinus Torvalds return err; 12531da177e4SLinus Torvalds 12541da177e4SLinus Torvalds out_close_1: 12551da177e4SLinus Torvalds sock_release(sock2); 12561da177e4SLinus Torvalds sys_close(fd1); 12571da177e4SLinus Torvalds return err; 12581da177e4SLinus Torvalds 12591da177e4SLinus Torvalds out_release_both: 12601da177e4SLinus Torvalds sock_release(sock2); 12611da177e4SLinus Torvalds out_release_1: 12621da177e4SLinus Torvalds sock_release(sock1); 12631da177e4SLinus Torvalds out: 12641da177e4SLinus Torvalds return err; 12651da177e4SLinus Torvalds } 12661da177e4SLinus Torvalds 12671da177e4SLinus Torvalds 12681da177e4SLinus Torvalds /* 12691da177e4SLinus Torvalds * Bind a name to a socket. Nothing much to do here since it's 12701da177e4SLinus Torvalds * the protocol's responsibility to handle the local address. 12711da177e4SLinus Torvalds * 12721da177e4SLinus Torvalds * We move the socket address to kernel space before we call 12731da177e4SLinus Torvalds * the protocol layer (having also checked the address is ok). 12741da177e4SLinus Torvalds */ 12751da177e4SLinus Torvalds 12761da177e4SLinus Torvalds asmlinkage long sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) 12771da177e4SLinus Torvalds { 12781da177e4SLinus Torvalds struct socket *sock; 12791da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 12801da177e4SLinus Torvalds int err; 12811da177e4SLinus Torvalds 12821da177e4SLinus Torvalds if((sock = sockfd_lookup(fd,&err))!=NULL) 12831da177e4SLinus Torvalds { 12841da177e4SLinus Torvalds if((err=move_addr_to_kernel(umyaddr,addrlen,address))>=0) { 12851da177e4SLinus Torvalds err = security_socket_bind(sock, (struct sockaddr *)address, addrlen); 12861da177e4SLinus Torvalds if (err) { 12871da177e4SLinus Torvalds sockfd_put(sock); 12881da177e4SLinus Torvalds return err; 12891da177e4SLinus Torvalds } 12901da177e4SLinus Torvalds err = sock->ops->bind(sock, (struct sockaddr *)address, addrlen); 12911da177e4SLinus Torvalds } 12921da177e4SLinus Torvalds sockfd_put(sock); 12931da177e4SLinus Torvalds } 12941da177e4SLinus Torvalds return err; 12951da177e4SLinus Torvalds } 12961da177e4SLinus Torvalds 12971da177e4SLinus Torvalds 12981da177e4SLinus Torvalds /* 12991da177e4SLinus Torvalds * Perform a listen. Basically, we allow the protocol to do anything 13001da177e4SLinus Torvalds * necessary for a listen, and if that works, we mark the socket as 13011da177e4SLinus Torvalds * ready for listening. 13021da177e4SLinus Torvalds */ 13031da177e4SLinus Torvalds 13041da177e4SLinus Torvalds int sysctl_somaxconn = SOMAXCONN; 13051da177e4SLinus Torvalds 13061da177e4SLinus Torvalds asmlinkage long sys_listen(int fd, int backlog) 13071da177e4SLinus Torvalds { 13081da177e4SLinus Torvalds struct socket *sock; 13091da177e4SLinus Torvalds int err; 13101da177e4SLinus Torvalds 13111da177e4SLinus Torvalds if ((sock = sockfd_lookup(fd, &err)) != NULL) { 13121da177e4SLinus Torvalds if ((unsigned) backlog > sysctl_somaxconn) 13131da177e4SLinus Torvalds backlog = sysctl_somaxconn; 13141da177e4SLinus Torvalds 13151da177e4SLinus Torvalds err = security_socket_listen(sock, backlog); 13161da177e4SLinus Torvalds if (err) { 13171da177e4SLinus Torvalds sockfd_put(sock); 13181da177e4SLinus Torvalds return err; 13191da177e4SLinus Torvalds } 13201da177e4SLinus Torvalds 13211da177e4SLinus Torvalds err=sock->ops->listen(sock, backlog); 13221da177e4SLinus Torvalds sockfd_put(sock); 13231da177e4SLinus Torvalds } 13241da177e4SLinus Torvalds return err; 13251da177e4SLinus Torvalds } 13261da177e4SLinus Torvalds 13271da177e4SLinus Torvalds 13281da177e4SLinus Torvalds /* 13291da177e4SLinus Torvalds * For accept, we attempt to create a new socket, set up the link 13301da177e4SLinus Torvalds * with the client, wake up the client, then return the new 13311da177e4SLinus Torvalds * connected fd. We collect the address of the connector in kernel 13321da177e4SLinus Torvalds * space and move it to user at the very end. This is unclean because 13331da177e4SLinus Torvalds * we open the socket then return an error. 13341da177e4SLinus Torvalds * 13351da177e4SLinus Torvalds * 1003.1g adds the ability to recvmsg() to query connection pending 13361da177e4SLinus Torvalds * status to recvmsg. We need to add that support in a way thats 13371da177e4SLinus Torvalds * clean when we restucture accept also. 13381da177e4SLinus Torvalds */ 13391da177e4SLinus Torvalds 13401da177e4SLinus Torvalds asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr, int __user *upeer_addrlen) 13411da177e4SLinus Torvalds { 13421da177e4SLinus Torvalds struct socket *sock, *newsock; 13431da177e4SLinus Torvalds int err, len; 13441da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 13451da177e4SLinus Torvalds 13461da177e4SLinus Torvalds sock = sockfd_lookup(fd, &err); 13471da177e4SLinus Torvalds if (!sock) 13481da177e4SLinus Torvalds goto out; 13491da177e4SLinus Torvalds 13501da177e4SLinus Torvalds err = -ENFILE; 13511da177e4SLinus Torvalds if (!(newsock = sock_alloc())) 13521da177e4SLinus Torvalds goto out_put; 13531da177e4SLinus Torvalds 13541da177e4SLinus Torvalds newsock->type = sock->type; 13551da177e4SLinus Torvalds newsock->ops = sock->ops; 13561da177e4SLinus Torvalds 13571da177e4SLinus Torvalds err = security_socket_accept(sock, newsock); 13581da177e4SLinus Torvalds if (err) 13591da177e4SLinus Torvalds goto out_release; 13601da177e4SLinus Torvalds 13611da177e4SLinus Torvalds /* 13621da177e4SLinus Torvalds * We don't need try_module_get here, as the listening socket (sock) 13631da177e4SLinus Torvalds * has the protocol module (sock->ops->owner) held. 13641da177e4SLinus Torvalds */ 13651da177e4SLinus Torvalds __module_get(newsock->ops->owner); 13661da177e4SLinus Torvalds 13671da177e4SLinus Torvalds err = sock->ops->accept(sock, newsock, sock->file->f_flags); 13681da177e4SLinus Torvalds if (err < 0) 13691da177e4SLinus Torvalds goto out_release; 13701da177e4SLinus Torvalds 13711da177e4SLinus Torvalds if (upeer_sockaddr) { 13721da177e4SLinus Torvalds if(newsock->ops->getname(newsock, (struct sockaddr *)address, &len, 2)<0) { 13731da177e4SLinus Torvalds err = -ECONNABORTED; 13741da177e4SLinus Torvalds goto out_release; 13751da177e4SLinus Torvalds } 13761da177e4SLinus Torvalds err = move_addr_to_user(address, len, upeer_sockaddr, upeer_addrlen); 13771da177e4SLinus Torvalds if (err < 0) 13781da177e4SLinus Torvalds goto out_release; 13791da177e4SLinus Torvalds } 13801da177e4SLinus Torvalds 13811da177e4SLinus Torvalds /* File flags are not inherited via accept() unlike another OSes. */ 13821da177e4SLinus Torvalds 13831da177e4SLinus Torvalds if ((err = sock_map_fd(newsock)) < 0) 13841da177e4SLinus Torvalds goto out_release; 13851da177e4SLinus Torvalds 13861da177e4SLinus Torvalds security_socket_post_accept(sock, newsock); 13871da177e4SLinus Torvalds 13881da177e4SLinus Torvalds out_put: 13891da177e4SLinus Torvalds sockfd_put(sock); 13901da177e4SLinus Torvalds out: 13911da177e4SLinus Torvalds return err; 13921da177e4SLinus Torvalds out_release: 13931da177e4SLinus Torvalds sock_release(newsock); 13941da177e4SLinus Torvalds goto out_put; 13951da177e4SLinus Torvalds } 13961da177e4SLinus Torvalds 13971da177e4SLinus Torvalds 13981da177e4SLinus Torvalds /* 13991da177e4SLinus Torvalds * Attempt to connect to a socket with the server address. The address 14001da177e4SLinus Torvalds * is in user space so we verify it is OK and move it to kernel space. 14011da177e4SLinus Torvalds * 14021da177e4SLinus Torvalds * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to 14031da177e4SLinus Torvalds * break bindings 14041da177e4SLinus Torvalds * 14051da177e4SLinus Torvalds * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and 14061da177e4SLinus Torvalds * other SEQPACKET protocols that take time to connect() as it doesn't 14071da177e4SLinus Torvalds * include the -EINPROGRESS status for such sockets. 14081da177e4SLinus Torvalds */ 14091da177e4SLinus Torvalds 14101da177e4SLinus Torvalds asmlinkage long sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen) 14111da177e4SLinus Torvalds { 14121da177e4SLinus Torvalds struct socket *sock; 14131da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 14141da177e4SLinus Torvalds int err; 14151da177e4SLinus Torvalds 14161da177e4SLinus Torvalds sock = sockfd_lookup(fd, &err); 14171da177e4SLinus Torvalds if (!sock) 14181da177e4SLinus Torvalds goto out; 14191da177e4SLinus Torvalds err = move_addr_to_kernel(uservaddr, addrlen, address); 14201da177e4SLinus Torvalds if (err < 0) 14211da177e4SLinus Torvalds goto out_put; 14221da177e4SLinus Torvalds 14231da177e4SLinus Torvalds err = security_socket_connect(sock, (struct sockaddr *)address, addrlen); 14241da177e4SLinus Torvalds if (err) 14251da177e4SLinus Torvalds goto out_put; 14261da177e4SLinus Torvalds 14271da177e4SLinus Torvalds err = sock->ops->connect(sock, (struct sockaddr *) address, addrlen, 14281da177e4SLinus Torvalds sock->file->f_flags); 14291da177e4SLinus Torvalds out_put: 14301da177e4SLinus Torvalds sockfd_put(sock); 14311da177e4SLinus Torvalds out: 14321da177e4SLinus Torvalds return err; 14331da177e4SLinus Torvalds } 14341da177e4SLinus Torvalds 14351da177e4SLinus Torvalds /* 14361da177e4SLinus Torvalds * Get the local address ('name') of a socket object. Move the obtained 14371da177e4SLinus Torvalds * name to user space. 14381da177e4SLinus Torvalds */ 14391da177e4SLinus Torvalds 14401da177e4SLinus Torvalds asmlinkage long sys_getsockname(int fd, struct sockaddr __user *usockaddr, int __user *usockaddr_len) 14411da177e4SLinus Torvalds { 14421da177e4SLinus Torvalds struct socket *sock; 14431da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 14441da177e4SLinus Torvalds int len, err; 14451da177e4SLinus Torvalds 14461da177e4SLinus Torvalds sock = sockfd_lookup(fd, &err); 14471da177e4SLinus Torvalds if (!sock) 14481da177e4SLinus Torvalds goto out; 14491da177e4SLinus Torvalds 14501da177e4SLinus Torvalds err = security_socket_getsockname(sock); 14511da177e4SLinus Torvalds if (err) 14521da177e4SLinus Torvalds goto out_put; 14531da177e4SLinus Torvalds 14541da177e4SLinus Torvalds err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 0); 14551da177e4SLinus Torvalds if (err) 14561da177e4SLinus Torvalds goto out_put; 14571da177e4SLinus Torvalds err = move_addr_to_user(address, len, usockaddr, usockaddr_len); 14581da177e4SLinus Torvalds 14591da177e4SLinus Torvalds out_put: 14601da177e4SLinus Torvalds sockfd_put(sock); 14611da177e4SLinus Torvalds out: 14621da177e4SLinus Torvalds return err; 14631da177e4SLinus Torvalds } 14641da177e4SLinus Torvalds 14651da177e4SLinus Torvalds /* 14661da177e4SLinus Torvalds * Get the remote address ('name') of a socket object. Move the obtained 14671da177e4SLinus Torvalds * name to user space. 14681da177e4SLinus Torvalds */ 14691da177e4SLinus Torvalds 14701da177e4SLinus Torvalds asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr, int __user *usockaddr_len) 14711da177e4SLinus Torvalds { 14721da177e4SLinus Torvalds struct socket *sock; 14731da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 14741da177e4SLinus Torvalds int len, err; 14751da177e4SLinus Torvalds 14761da177e4SLinus Torvalds if ((sock = sockfd_lookup(fd, &err))!=NULL) 14771da177e4SLinus Torvalds { 14781da177e4SLinus Torvalds err = security_socket_getpeername(sock); 14791da177e4SLinus Torvalds if (err) { 14801da177e4SLinus Torvalds sockfd_put(sock); 14811da177e4SLinus Torvalds return err; 14821da177e4SLinus Torvalds } 14831da177e4SLinus Torvalds 14841da177e4SLinus Torvalds err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 1); 14851da177e4SLinus Torvalds if (!err) 14861da177e4SLinus Torvalds err=move_addr_to_user(address,len, usockaddr, usockaddr_len); 14871da177e4SLinus Torvalds sockfd_put(sock); 14881da177e4SLinus Torvalds } 14891da177e4SLinus Torvalds return err; 14901da177e4SLinus Torvalds } 14911da177e4SLinus Torvalds 14921da177e4SLinus Torvalds /* 14931da177e4SLinus Torvalds * Send a datagram to a given address. We move the address into kernel 14941da177e4SLinus Torvalds * space and check the user space data area is readable before invoking 14951da177e4SLinus Torvalds * the protocol. 14961da177e4SLinus Torvalds */ 14971da177e4SLinus Torvalds 14981da177e4SLinus Torvalds asmlinkage long sys_sendto(int fd, void __user * buff, size_t len, unsigned flags, 14991da177e4SLinus Torvalds struct sockaddr __user *addr, int addr_len) 15001da177e4SLinus Torvalds { 15011da177e4SLinus Torvalds struct socket *sock; 15021da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 15031da177e4SLinus Torvalds int err; 15041da177e4SLinus Torvalds struct msghdr msg; 15051da177e4SLinus Torvalds struct iovec iov; 15061da177e4SLinus Torvalds 15071da177e4SLinus Torvalds sock = sockfd_lookup(fd, &err); 15081da177e4SLinus Torvalds if (!sock) 15091da177e4SLinus Torvalds goto out; 15101da177e4SLinus Torvalds iov.iov_base=buff; 15111da177e4SLinus Torvalds iov.iov_len=len; 15121da177e4SLinus Torvalds msg.msg_name=NULL; 15131da177e4SLinus Torvalds msg.msg_iov=&iov; 15141da177e4SLinus Torvalds msg.msg_iovlen=1; 15151da177e4SLinus Torvalds msg.msg_control=NULL; 15161da177e4SLinus Torvalds msg.msg_controllen=0; 15171da177e4SLinus Torvalds msg.msg_namelen=0; 15181da177e4SLinus Torvalds if(addr) 15191da177e4SLinus Torvalds { 15201da177e4SLinus Torvalds err = move_addr_to_kernel(addr, addr_len, address); 15211da177e4SLinus Torvalds if (err < 0) 15221da177e4SLinus Torvalds goto out_put; 15231da177e4SLinus Torvalds msg.msg_name=address; 15241da177e4SLinus Torvalds msg.msg_namelen=addr_len; 15251da177e4SLinus Torvalds } 15261da177e4SLinus Torvalds if (sock->file->f_flags & O_NONBLOCK) 15271da177e4SLinus Torvalds flags |= MSG_DONTWAIT; 15281da177e4SLinus Torvalds msg.msg_flags = flags; 15291da177e4SLinus Torvalds err = sock_sendmsg(sock, &msg, len); 15301da177e4SLinus Torvalds 15311da177e4SLinus Torvalds out_put: 15321da177e4SLinus Torvalds sockfd_put(sock); 15331da177e4SLinus Torvalds out: 15341da177e4SLinus Torvalds return err; 15351da177e4SLinus Torvalds } 15361da177e4SLinus Torvalds 15371da177e4SLinus Torvalds /* 15381da177e4SLinus Torvalds * Send a datagram down a socket. 15391da177e4SLinus Torvalds */ 15401da177e4SLinus Torvalds 15411da177e4SLinus Torvalds asmlinkage long sys_send(int fd, void __user * buff, size_t len, unsigned flags) 15421da177e4SLinus Torvalds { 15431da177e4SLinus Torvalds return sys_sendto(fd, buff, len, flags, NULL, 0); 15441da177e4SLinus Torvalds } 15451da177e4SLinus Torvalds 15461da177e4SLinus Torvalds /* 15471da177e4SLinus Torvalds * Receive a frame from the socket and optionally record the address of the 15481da177e4SLinus Torvalds * sender. We verify the buffers are writable and if needed move the 15491da177e4SLinus Torvalds * sender address from kernel to user space. 15501da177e4SLinus Torvalds */ 15511da177e4SLinus Torvalds 15521da177e4SLinus Torvalds asmlinkage long sys_recvfrom(int fd, void __user * ubuf, size_t size, unsigned flags, 15531da177e4SLinus Torvalds struct sockaddr __user *addr, int __user *addr_len) 15541da177e4SLinus Torvalds { 15551da177e4SLinus Torvalds struct socket *sock; 15561da177e4SLinus Torvalds struct iovec iov; 15571da177e4SLinus Torvalds struct msghdr msg; 15581da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 15591da177e4SLinus Torvalds int err,err2; 15601da177e4SLinus Torvalds 15611da177e4SLinus Torvalds sock = sockfd_lookup(fd, &err); 15621da177e4SLinus Torvalds if (!sock) 15631da177e4SLinus Torvalds goto out; 15641da177e4SLinus Torvalds 15651da177e4SLinus Torvalds msg.msg_control=NULL; 15661da177e4SLinus Torvalds msg.msg_controllen=0; 15671da177e4SLinus Torvalds msg.msg_iovlen=1; 15681da177e4SLinus Torvalds msg.msg_iov=&iov; 15691da177e4SLinus Torvalds iov.iov_len=size; 15701da177e4SLinus Torvalds iov.iov_base=ubuf; 15711da177e4SLinus Torvalds msg.msg_name=address; 15721da177e4SLinus Torvalds msg.msg_namelen=MAX_SOCK_ADDR; 15731da177e4SLinus Torvalds if (sock->file->f_flags & O_NONBLOCK) 15741da177e4SLinus Torvalds flags |= MSG_DONTWAIT; 15751da177e4SLinus Torvalds err=sock_recvmsg(sock, &msg, size, flags); 15761da177e4SLinus Torvalds 15771da177e4SLinus Torvalds if(err >= 0 && addr != NULL) 15781da177e4SLinus Torvalds { 15791da177e4SLinus Torvalds err2=move_addr_to_user(address, msg.msg_namelen, addr, addr_len); 15801da177e4SLinus Torvalds if(err2<0) 15811da177e4SLinus Torvalds err=err2; 15821da177e4SLinus Torvalds } 15831da177e4SLinus Torvalds sockfd_put(sock); 15841da177e4SLinus Torvalds out: 15851da177e4SLinus Torvalds return err; 15861da177e4SLinus Torvalds } 15871da177e4SLinus Torvalds 15881da177e4SLinus Torvalds /* 15891da177e4SLinus Torvalds * Receive a datagram from a socket. 15901da177e4SLinus Torvalds */ 15911da177e4SLinus Torvalds 15921da177e4SLinus Torvalds asmlinkage long sys_recv(int fd, void __user * ubuf, size_t size, unsigned flags) 15931da177e4SLinus Torvalds { 15941da177e4SLinus Torvalds return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); 15951da177e4SLinus Torvalds } 15961da177e4SLinus Torvalds 15971da177e4SLinus Torvalds /* 15981da177e4SLinus Torvalds * Set a socket option. Because we don't know the option lengths we have 15991da177e4SLinus Torvalds * to pass the user mode parameter for the protocols to sort out. 16001da177e4SLinus Torvalds */ 16011da177e4SLinus Torvalds 16021da177e4SLinus Torvalds asmlinkage long sys_setsockopt(int fd, int level, int optname, char __user *optval, int optlen) 16031da177e4SLinus Torvalds { 16041da177e4SLinus Torvalds int err; 16051da177e4SLinus Torvalds struct socket *sock; 16061da177e4SLinus Torvalds 16071da177e4SLinus Torvalds if (optlen < 0) 16081da177e4SLinus Torvalds return -EINVAL; 16091da177e4SLinus Torvalds 16101da177e4SLinus Torvalds if ((sock = sockfd_lookup(fd, &err))!=NULL) 16111da177e4SLinus Torvalds { 16121da177e4SLinus Torvalds err = security_socket_setsockopt(sock,level,optname); 16131da177e4SLinus Torvalds if (err) { 16141da177e4SLinus Torvalds sockfd_put(sock); 16151da177e4SLinus Torvalds return err; 16161da177e4SLinus Torvalds } 16171da177e4SLinus Torvalds 16181da177e4SLinus Torvalds if (level == SOL_SOCKET) 16191da177e4SLinus Torvalds err=sock_setsockopt(sock,level,optname,optval,optlen); 16201da177e4SLinus Torvalds else 16211da177e4SLinus Torvalds err=sock->ops->setsockopt(sock, level, optname, optval, optlen); 16221da177e4SLinus Torvalds sockfd_put(sock); 16231da177e4SLinus Torvalds } 16241da177e4SLinus Torvalds return err; 16251da177e4SLinus Torvalds } 16261da177e4SLinus Torvalds 16271da177e4SLinus Torvalds /* 16281da177e4SLinus Torvalds * Get a socket option. Because we don't know the option lengths we have 16291da177e4SLinus Torvalds * to pass a user mode parameter for the protocols to sort out. 16301da177e4SLinus Torvalds */ 16311da177e4SLinus Torvalds 16321da177e4SLinus Torvalds asmlinkage long sys_getsockopt(int fd, int level, int optname, char __user *optval, int __user *optlen) 16331da177e4SLinus Torvalds { 16341da177e4SLinus Torvalds int err; 16351da177e4SLinus Torvalds struct socket *sock; 16361da177e4SLinus Torvalds 16371da177e4SLinus Torvalds if ((sock = sockfd_lookup(fd, &err))!=NULL) 16381da177e4SLinus Torvalds { 16391da177e4SLinus Torvalds err = security_socket_getsockopt(sock, level, 16401da177e4SLinus Torvalds optname); 16411da177e4SLinus Torvalds if (err) { 16421da177e4SLinus Torvalds sockfd_put(sock); 16431da177e4SLinus Torvalds return err; 16441da177e4SLinus Torvalds } 16451da177e4SLinus Torvalds 16461da177e4SLinus Torvalds if (level == SOL_SOCKET) 16471da177e4SLinus Torvalds err=sock_getsockopt(sock,level,optname,optval,optlen); 16481da177e4SLinus Torvalds else 16491da177e4SLinus Torvalds err=sock->ops->getsockopt(sock, level, optname, optval, optlen); 16501da177e4SLinus Torvalds sockfd_put(sock); 16511da177e4SLinus Torvalds } 16521da177e4SLinus Torvalds return err; 16531da177e4SLinus Torvalds } 16541da177e4SLinus Torvalds 16551da177e4SLinus Torvalds 16561da177e4SLinus Torvalds /* 16571da177e4SLinus Torvalds * Shutdown a socket. 16581da177e4SLinus Torvalds */ 16591da177e4SLinus Torvalds 16601da177e4SLinus Torvalds asmlinkage long sys_shutdown(int fd, int how) 16611da177e4SLinus Torvalds { 16621da177e4SLinus Torvalds int err; 16631da177e4SLinus Torvalds struct socket *sock; 16641da177e4SLinus Torvalds 16651da177e4SLinus Torvalds if ((sock = sockfd_lookup(fd, &err))!=NULL) 16661da177e4SLinus Torvalds { 16671da177e4SLinus Torvalds err = security_socket_shutdown(sock, how); 16681da177e4SLinus Torvalds if (err) { 16691da177e4SLinus Torvalds sockfd_put(sock); 16701da177e4SLinus Torvalds return err; 16711da177e4SLinus Torvalds } 16721da177e4SLinus Torvalds 16731da177e4SLinus Torvalds err=sock->ops->shutdown(sock, how); 16741da177e4SLinus Torvalds sockfd_put(sock); 16751da177e4SLinus Torvalds } 16761da177e4SLinus Torvalds return err; 16771da177e4SLinus Torvalds } 16781da177e4SLinus Torvalds 16791da177e4SLinus Torvalds /* A couple of helpful macros for getting the address of the 32/64 bit 16801da177e4SLinus Torvalds * fields which are the same type (int / unsigned) on our platforms. 16811da177e4SLinus Torvalds */ 16821da177e4SLinus Torvalds #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) 16831da177e4SLinus Torvalds #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) 16841da177e4SLinus Torvalds #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) 16851da177e4SLinus Torvalds 16861da177e4SLinus Torvalds 16871da177e4SLinus Torvalds /* 16881da177e4SLinus Torvalds * BSD sendmsg interface 16891da177e4SLinus Torvalds */ 16901da177e4SLinus Torvalds 16911da177e4SLinus Torvalds asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags) 16921da177e4SLinus Torvalds { 16931da177e4SLinus Torvalds struct compat_msghdr __user *msg_compat = (struct compat_msghdr __user *)msg; 16941da177e4SLinus Torvalds struct socket *sock; 16951da177e4SLinus Torvalds char address[MAX_SOCK_ADDR]; 16961da177e4SLinus Torvalds struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; 16971da177e4SLinus Torvalds unsigned char ctl[sizeof(struct cmsghdr) + 20]; /* 20 is size of ipv6_pktinfo */ 16981da177e4SLinus Torvalds unsigned char *ctl_buf = ctl; 16991da177e4SLinus Torvalds struct msghdr msg_sys; 17001da177e4SLinus Torvalds int err, ctl_len, iov_size, total_len; 17011da177e4SLinus Torvalds 17021da177e4SLinus Torvalds err = -EFAULT; 17031da177e4SLinus Torvalds if (MSG_CMSG_COMPAT & flags) { 17041da177e4SLinus Torvalds if (get_compat_msghdr(&msg_sys, msg_compat)) 17051da177e4SLinus Torvalds return -EFAULT; 17061da177e4SLinus Torvalds } else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) 17071da177e4SLinus Torvalds return -EFAULT; 17081da177e4SLinus Torvalds 17091da177e4SLinus Torvalds sock = sockfd_lookup(fd, &err); 17101da177e4SLinus Torvalds if (!sock) 17111da177e4SLinus Torvalds goto out; 17121da177e4SLinus Torvalds 17131da177e4SLinus Torvalds /* do not move before msg_sys is valid */ 17141da177e4SLinus Torvalds err = -EMSGSIZE; 17151da177e4SLinus Torvalds if (msg_sys.msg_iovlen > UIO_MAXIOV) 17161da177e4SLinus Torvalds goto out_put; 17171da177e4SLinus Torvalds 17181da177e4SLinus Torvalds /* Check whether to allocate the iovec area*/ 17191da177e4SLinus Torvalds err = -ENOMEM; 17201da177e4SLinus Torvalds iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); 17211da177e4SLinus Torvalds if (msg_sys.msg_iovlen > UIO_FASTIOV) { 17221da177e4SLinus Torvalds iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); 17231da177e4SLinus Torvalds if (!iov) 17241da177e4SLinus Torvalds goto out_put; 17251da177e4SLinus Torvalds } 17261da177e4SLinus Torvalds 17271da177e4SLinus Torvalds /* This will also move the address data into kernel space */ 17281da177e4SLinus Torvalds if (MSG_CMSG_COMPAT & flags) { 17291da177e4SLinus Torvalds err = verify_compat_iovec(&msg_sys, iov, address, VERIFY_READ); 17301da177e4SLinus Torvalds } else 17311da177e4SLinus Torvalds err = verify_iovec(&msg_sys, iov, address, VERIFY_READ); 17321da177e4SLinus Torvalds if (err < 0) 17331da177e4SLinus Torvalds goto out_freeiov; 17341da177e4SLinus Torvalds total_len = err; 17351da177e4SLinus Torvalds 17361da177e4SLinus Torvalds err = -ENOBUFS; 17371da177e4SLinus Torvalds 17381da177e4SLinus Torvalds if (msg_sys.msg_controllen > INT_MAX) 17391da177e4SLinus Torvalds goto out_freeiov; 17401da177e4SLinus Torvalds ctl_len = msg_sys.msg_controllen; 17411da177e4SLinus Torvalds if ((MSG_CMSG_COMPAT & flags) && ctl_len) { 17421da177e4SLinus Torvalds err = cmsghdr_from_user_compat_to_kern(&msg_sys, ctl, sizeof(ctl)); 17431da177e4SLinus Torvalds if (err) 17441da177e4SLinus Torvalds goto out_freeiov; 17451da177e4SLinus Torvalds ctl_buf = msg_sys.msg_control; 17461da177e4SLinus Torvalds } else if (ctl_len) { 17471da177e4SLinus Torvalds if (ctl_len > sizeof(ctl)) 17481da177e4SLinus Torvalds { 17491da177e4SLinus Torvalds ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); 17501da177e4SLinus Torvalds if (ctl_buf == NULL) 17511da177e4SLinus Torvalds goto out_freeiov; 17521da177e4SLinus Torvalds } 17531da177e4SLinus Torvalds err = -EFAULT; 17541da177e4SLinus Torvalds /* 17551da177e4SLinus Torvalds * Careful! Before this, msg_sys.msg_control contains a user pointer. 17561da177e4SLinus Torvalds * Afterwards, it will be a kernel pointer. Thus the compiler-assisted 17571da177e4SLinus Torvalds * checking falls down on this. 17581da177e4SLinus Torvalds */ 17591da177e4SLinus Torvalds if (copy_from_user(ctl_buf, (void __user *) msg_sys.msg_control, ctl_len)) 17601da177e4SLinus Torvalds goto out_freectl; 17611da177e4SLinus Torvalds msg_sys.msg_control = ctl_buf; 17621da177e4SLinus Torvalds } 17631da177e4SLinus Torvalds msg_sys.msg_flags = flags; 17641da177e4SLinus Torvalds 17651da177e4SLinus Torvalds if (sock->file->f_flags & O_NONBLOCK) 17661da177e4SLinus Torvalds msg_sys.msg_flags |= MSG_DONTWAIT; 17671da177e4SLinus Torvalds err = sock_sendmsg(sock, &msg_sys, total_len); 17681da177e4SLinus Torvalds 17691da177e4SLinus Torvalds out_freectl: 17701da177e4SLinus Torvalds if (ctl_buf != ctl) 17711da177e4SLinus Torvalds sock_kfree_s(sock->sk, ctl_buf, ctl_len); 17721da177e4SLinus Torvalds out_freeiov: 17731da177e4SLinus Torvalds if (iov != iovstack) 17741da177e4SLinus Torvalds sock_kfree_s(sock->sk, iov, iov_size); 17751da177e4SLinus Torvalds out_put: 17761da177e4SLinus Torvalds sockfd_put(sock); 17771da177e4SLinus Torvalds out: 17781da177e4SLinus Torvalds return err; 17791da177e4SLinus Torvalds } 17801da177e4SLinus Torvalds 17811da177e4SLinus Torvalds /* 17821da177e4SLinus Torvalds * BSD recvmsg interface 17831da177e4SLinus Torvalds */ 17841da177e4SLinus Torvalds 17851da177e4SLinus Torvalds asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg, unsigned int flags) 17861da177e4SLinus Torvalds { 17871da177e4SLinus Torvalds struct compat_msghdr __user *msg_compat = (struct compat_msghdr __user *)msg; 17881da177e4SLinus Torvalds struct socket *sock; 17891da177e4SLinus Torvalds struct iovec iovstack[UIO_FASTIOV]; 17901da177e4SLinus Torvalds struct iovec *iov=iovstack; 17911da177e4SLinus Torvalds struct msghdr msg_sys; 17921da177e4SLinus Torvalds unsigned long cmsg_ptr; 17931da177e4SLinus Torvalds int err, iov_size, total_len, len; 17941da177e4SLinus Torvalds 17951da177e4SLinus Torvalds /* kernel mode address */ 17961da177e4SLinus Torvalds char addr[MAX_SOCK_ADDR]; 17971da177e4SLinus Torvalds 17981da177e4SLinus Torvalds /* user mode address pointers */ 17991da177e4SLinus Torvalds struct sockaddr __user *uaddr; 18001da177e4SLinus Torvalds int __user *uaddr_len; 18011da177e4SLinus Torvalds 18021da177e4SLinus Torvalds if (MSG_CMSG_COMPAT & flags) { 18031da177e4SLinus Torvalds if (get_compat_msghdr(&msg_sys, msg_compat)) 18041da177e4SLinus Torvalds return -EFAULT; 18051da177e4SLinus Torvalds } else 18061da177e4SLinus Torvalds if (copy_from_user(&msg_sys,msg,sizeof(struct msghdr))) 18071da177e4SLinus Torvalds return -EFAULT; 18081da177e4SLinus Torvalds 18091da177e4SLinus Torvalds sock = sockfd_lookup(fd, &err); 18101da177e4SLinus Torvalds if (!sock) 18111da177e4SLinus Torvalds goto out; 18121da177e4SLinus Torvalds 18131da177e4SLinus Torvalds err = -EMSGSIZE; 18141da177e4SLinus Torvalds if (msg_sys.msg_iovlen > UIO_MAXIOV) 18151da177e4SLinus Torvalds goto out_put; 18161da177e4SLinus Torvalds 18171da177e4SLinus Torvalds /* Check whether to allocate the iovec area*/ 18181da177e4SLinus Torvalds err = -ENOMEM; 18191da177e4SLinus Torvalds iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); 18201da177e4SLinus Torvalds if (msg_sys.msg_iovlen > UIO_FASTIOV) { 18211da177e4SLinus Torvalds iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); 18221da177e4SLinus Torvalds if (!iov) 18231da177e4SLinus Torvalds goto out_put; 18241da177e4SLinus Torvalds } 18251da177e4SLinus Torvalds 18261da177e4SLinus Torvalds /* 18271da177e4SLinus Torvalds * Save the user-mode address (verify_iovec will change the 18281da177e4SLinus Torvalds * kernel msghdr to use the kernel address space) 18291da177e4SLinus Torvalds */ 18301da177e4SLinus Torvalds 18311da177e4SLinus Torvalds uaddr = (void __user *) msg_sys.msg_name; 18321da177e4SLinus Torvalds uaddr_len = COMPAT_NAMELEN(msg); 18331da177e4SLinus Torvalds if (MSG_CMSG_COMPAT & flags) { 18341da177e4SLinus Torvalds err = verify_compat_iovec(&msg_sys, iov, addr, VERIFY_WRITE); 18351da177e4SLinus Torvalds } else 18361da177e4SLinus Torvalds err = verify_iovec(&msg_sys, iov, addr, VERIFY_WRITE); 18371da177e4SLinus Torvalds if (err < 0) 18381da177e4SLinus Torvalds goto out_freeiov; 18391da177e4SLinus Torvalds total_len=err; 18401da177e4SLinus Torvalds 18411da177e4SLinus Torvalds cmsg_ptr = (unsigned long)msg_sys.msg_control; 18421da177e4SLinus Torvalds msg_sys.msg_flags = 0; 18431da177e4SLinus Torvalds if (MSG_CMSG_COMPAT & flags) 18441da177e4SLinus Torvalds msg_sys.msg_flags = MSG_CMSG_COMPAT; 18451da177e4SLinus Torvalds 18461da177e4SLinus Torvalds if (sock->file->f_flags & O_NONBLOCK) 18471da177e4SLinus Torvalds flags |= MSG_DONTWAIT; 18481da177e4SLinus Torvalds err = sock_recvmsg(sock, &msg_sys, total_len, flags); 18491da177e4SLinus Torvalds if (err < 0) 18501da177e4SLinus Torvalds goto out_freeiov; 18511da177e4SLinus Torvalds len = err; 18521da177e4SLinus Torvalds 18531da177e4SLinus Torvalds if (uaddr != NULL) { 18541da177e4SLinus Torvalds err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr, uaddr_len); 18551da177e4SLinus Torvalds if (err < 0) 18561da177e4SLinus Torvalds goto out_freeiov; 18571da177e4SLinus Torvalds } 18581da177e4SLinus Torvalds err = __put_user(msg_sys.msg_flags, COMPAT_FLAGS(msg)); 18591da177e4SLinus Torvalds if (err) 18601da177e4SLinus Torvalds goto out_freeiov; 18611da177e4SLinus Torvalds if (MSG_CMSG_COMPAT & flags) 18621da177e4SLinus Torvalds err = __put_user((unsigned long)msg_sys.msg_control-cmsg_ptr, 18631da177e4SLinus Torvalds &msg_compat->msg_controllen); 18641da177e4SLinus Torvalds else 18651da177e4SLinus Torvalds err = __put_user((unsigned long)msg_sys.msg_control-cmsg_ptr, 18661da177e4SLinus Torvalds &msg->msg_controllen); 18671da177e4SLinus Torvalds if (err) 18681da177e4SLinus Torvalds goto out_freeiov; 18691da177e4SLinus Torvalds err = len; 18701da177e4SLinus Torvalds 18711da177e4SLinus Torvalds out_freeiov: 18721da177e4SLinus Torvalds if (iov != iovstack) 18731da177e4SLinus Torvalds sock_kfree_s(sock->sk, iov, iov_size); 18741da177e4SLinus Torvalds out_put: 18751da177e4SLinus Torvalds sockfd_put(sock); 18761da177e4SLinus Torvalds out: 18771da177e4SLinus Torvalds return err; 18781da177e4SLinus Torvalds } 18791da177e4SLinus Torvalds 18801da177e4SLinus Torvalds #ifdef __ARCH_WANT_SYS_SOCKETCALL 18811da177e4SLinus Torvalds 18821da177e4SLinus Torvalds /* Argument list sizes for sys_socketcall */ 18831da177e4SLinus Torvalds #define AL(x) ((x) * sizeof(unsigned long)) 18841da177e4SLinus Torvalds static unsigned char nargs[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3), 18851da177e4SLinus Torvalds AL(3),AL(3),AL(4),AL(4),AL(4),AL(6), 18861da177e4SLinus Torvalds AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)}; 18871da177e4SLinus Torvalds #undef AL 18881da177e4SLinus Torvalds 18891da177e4SLinus Torvalds /* 18901da177e4SLinus Torvalds * System call vectors. 18911da177e4SLinus Torvalds * 18921da177e4SLinus Torvalds * Argument checking cleaned up. Saved 20% in size. 18931da177e4SLinus Torvalds * This function doesn't need to set the kernel lock because 18941da177e4SLinus Torvalds * it is set by the callees. 18951da177e4SLinus Torvalds */ 18961da177e4SLinus Torvalds 18971da177e4SLinus Torvalds asmlinkage long sys_socketcall(int call, unsigned long __user *args) 18981da177e4SLinus Torvalds { 18991da177e4SLinus Torvalds unsigned long a[6]; 19001da177e4SLinus Torvalds unsigned long a0,a1; 19011da177e4SLinus Torvalds int err; 19021da177e4SLinus Torvalds 19031da177e4SLinus Torvalds if(call<1||call>SYS_RECVMSG) 19041da177e4SLinus Torvalds return -EINVAL; 19051da177e4SLinus Torvalds 19061da177e4SLinus Torvalds /* copy_from_user should be SMP safe. */ 19071da177e4SLinus Torvalds if (copy_from_user(a, args, nargs[call])) 19081da177e4SLinus Torvalds return -EFAULT; 19091da177e4SLinus Torvalds 19101da177e4SLinus Torvalds a0=a[0]; 19111da177e4SLinus Torvalds a1=a[1]; 19121da177e4SLinus Torvalds 19131da177e4SLinus Torvalds switch(call) 19141da177e4SLinus Torvalds { 19151da177e4SLinus Torvalds case SYS_SOCKET: 19161da177e4SLinus Torvalds err = sys_socket(a0,a1,a[2]); 19171da177e4SLinus Torvalds break; 19181da177e4SLinus Torvalds case SYS_BIND: 19191da177e4SLinus Torvalds err = sys_bind(a0,(struct sockaddr __user *)a1, a[2]); 19201da177e4SLinus Torvalds break; 19211da177e4SLinus Torvalds case SYS_CONNECT: 19221da177e4SLinus Torvalds err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); 19231da177e4SLinus Torvalds break; 19241da177e4SLinus Torvalds case SYS_LISTEN: 19251da177e4SLinus Torvalds err = sys_listen(a0,a1); 19261da177e4SLinus Torvalds break; 19271da177e4SLinus Torvalds case SYS_ACCEPT: 19281da177e4SLinus Torvalds err = sys_accept(a0,(struct sockaddr __user *)a1, (int __user *)a[2]); 19291da177e4SLinus Torvalds break; 19301da177e4SLinus Torvalds case SYS_GETSOCKNAME: 19311da177e4SLinus Torvalds err = sys_getsockname(a0,(struct sockaddr __user *)a1, (int __user *)a[2]); 19321da177e4SLinus Torvalds break; 19331da177e4SLinus Torvalds case SYS_GETPEERNAME: 19341da177e4SLinus Torvalds err = sys_getpeername(a0, (struct sockaddr __user *)a1, (int __user *)a[2]); 19351da177e4SLinus Torvalds break; 19361da177e4SLinus Torvalds case SYS_SOCKETPAIR: 19371da177e4SLinus Torvalds err = sys_socketpair(a0,a1, a[2], (int __user *)a[3]); 19381da177e4SLinus Torvalds break; 19391da177e4SLinus Torvalds case SYS_SEND: 19401da177e4SLinus Torvalds err = sys_send(a0, (void __user *)a1, a[2], a[3]); 19411da177e4SLinus Torvalds break; 19421da177e4SLinus Torvalds case SYS_SENDTO: 19431da177e4SLinus Torvalds err = sys_sendto(a0,(void __user *)a1, a[2], a[3], 19441da177e4SLinus Torvalds (struct sockaddr __user *)a[4], a[5]); 19451da177e4SLinus Torvalds break; 19461da177e4SLinus Torvalds case SYS_RECV: 19471da177e4SLinus Torvalds err = sys_recv(a0, (void __user *)a1, a[2], a[3]); 19481da177e4SLinus Torvalds break; 19491da177e4SLinus Torvalds case SYS_RECVFROM: 19501da177e4SLinus Torvalds err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], 19511da177e4SLinus Torvalds (struct sockaddr __user *)a[4], (int __user *)a[5]); 19521da177e4SLinus Torvalds break; 19531da177e4SLinus Torvalds case SYS_SHUTDOWN: 19541da177e4SLinus Torvalds err = sys_shutdown(a0,a1); 19551da177e4SLinus Torvalds break; 19561da177e4SLinus Torvalds case SYS_SETSOCKOPT: 19571da177e4SLinus Torvalds err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); 19581da177e4SLinus Torvalds break; 19591da177e4SLinus Torvalds case SYS_GETSOCKOPT: 19601da177e4SLinus Torvalds err = sys_getsockopt(a0, a1, a[2], (char __user *)a[3], (int __user *)a[4]); 19611da177e4SLinus Torvalds break; 19621da177e4SLinus Torvalds case SYS_SENDMSG: 19631da177e4SLinus Torvalds err = sys_sendmsg(a0, (struct msghdr __user *) a1, a[2]); 19641da177e4SLinus Torvalds break; 19651da177e4SLinus Torvalds case SYS_RECVMSG: 19661da177e4SLinus Torvalds err = sys_recvmsg(a0, (struct msghdr __user *) a1, a[2]); 19671da177e4SLinus Torvalds break; 19681da177e4SLinus Torvalds default: 19691da177e4SLinus Torvalds err = -EINVAL; 19701da177e4SLinus Torvalds break; 19711da177e4SLinus Torvalds } 19721da177e4SLinus Torvalds return err; 19731da177e4SLinus Torvalds } 19741da177e4SLinus Torvalds 19751da177e4SLinus Torvalds #endif /* __ARCH_WANT_SYS_SOCKETCALL */ 19761da177e4SLinus Torvalds 19771da177e4SLinus Torvalds /* 19781da177e4SLinus Torvalds * This function is called by a protocol handler that wants to 19791da177e4SLinus Torvalds * advertise its address family, and have it linked into the 19801da177e4SLinus Torvalds * SOCKET module. 19811da177e4SLinus Torvalds */ 19821da177e4SLinus Torvalds 19831da177e4SLinus Torvalds int sock_register(struct net_proto_family *ops) 19841da177e4SLinus Torvalds { 19851da177e4SLinus Torvalds int err; 19861da177e4SLinus Torvalds 19871da177e4SLinus Torvalds if (ops->family >= NPROTO) { 19881da177e4SLinus Torvalds printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); 19891da177e4SLinus Torvalds return -ENOBUFS; 19901da177e4SLinus Torvalds } 19911da177e4SLinus Torvalds net_family_write_lock(); 19921da177e4SLinus Torvalds err = -EEXIST; 19931da177e4SLinus Torvalds if (net_families[ops->family] == NULL) { 19941da177e4SLinus Torvalds net_families[ops->family]=ops; 19951da177e4SLinus Torvalds err = 0; 19961da177e4SLinus Torvalds } 19971da177e4SLinus Torvalds net_family_write_unlock(); 19981da177e4SLinus Torvalds printk(KERN_INFO "NET: Registered protocol family %d\n", 19991da177e4SLinus Torvalds ops->family); 20001da177e4SLinus Torvalds return err; 20011da177e4SLinus Torvalds } 20021da177e4SLinus Torvalds 20031da177e4SLinus Torvalds /* 20041da177e4SLinus Torvalds * This function is called by a protocol handler that wants to 20051da177e4SLinus Torvalds * remove its address family, and have it unlinked from the 20061da177e4SLinus Torvalds * SOCKET module. 20071da177e4SLinus Torvalds */ 20081da177e4SLinus Torvalds 20091da177e4SLinus Torvalds int sock_unregister(int family) 20101da177e4SLinus Torvalds { 20111da177e4SLinus Torvalds if (family < 0 || family >= NPROTO) 20121da177e4SLinus Torvalds return -1; 20131da177e4SLinus Torvalds 20141da177e4SLinus Torvalds net_family_write_lock(); 20151da177e4SLinus Torvalds net_families[family]=NULL; 20161da177e4SLinus Torvalds net_family_write_unlock(); 20171da177e4SLinus Torvalds printk(KERN_INFO "NET: Unregistered protocol family %d\n", 20181da177e4SLinus Torvalds family); 20191da177e4SLinus Torvalds return 0; 20201da177e4SLinus Torvalds } 20211da177e4SLinus Torvalds 20221da177e4SLinus Torvalds 20231da177e4SLinus Torvalds extern void sk_init(void); 20241da177e4SLinus Torvalds 20251da177e4SLinus Torvalds void __init sock_init(void) 20261da177e4SLinus Torvalds { 20271da177e4SLinus Torvalds /* 20281da177e4SLinus Torvalds * Initialize sock SLAB cache. 20291da177e4SLinus Torvalds */ 20301da177e4SLinus Torvalds 20311da177e4SLinus Torvalds sk_init(); 20321da177e4SLinus Torvalds 20331da177e4SLinus Torvalds #ifdef SLAB_SKB 20341da177e4SLinus Torvalds /* 20351da177e4SLinus Torvalds * Initialize skbuff SLAB cache 20361da177e4SLinus Torvalds */ 20371da177e4SLinus Torvalds skb_init(); 20381da177e4SLinus Torvalds #endif 20391da177e4SLinus Torvalds 20401da177e4SLinus Torvalds /* 20411da177e4SLinus Torvalds * Initialize the protocols module. 20421da177e4SLinus Torvalds */ 20431da177e4SLinus Torvalds 20441da177e4SLinus Torvalds init_inodecache(); 20451da177e4SLinus Torvalds register_filesystem(&sock_fs_type); 20461da177e4SLinus Torvalds sock_mnt = kern_mount(&sock_fs_type); 20471da177e4SLinus Torvalds /* The real protocol initialization is performed when 20481da177e4SLinus Torvalds * do_initcalls is run. 20491da177e4SLinus Torvalds */ 20501da177e4SLinus Torvalds 20511da177e4SLinus Torvalds #ifdef CONFIG_NETFILTER 20521da177e4SLinus Torvalds netfilter_init(); 20531da177e4SLinus Torvalds #endif 20541da177e4SLinus Torvalds } 20551da177e4SLinus Torvalds 20561da177e4SLinus Torvalds #ifdef CONFIG_PROC_FS 20571da177e4SLinus Torvalds void socket_seq_show(struct seq_file *seq) 20581da177e4SLinus Torvalds { 20591da177e4SLinus Torvalds int cpu; 20601da177e4SLinus Torvalds int counter = 0; 20611da177e4SLinus Torvalds 20621da177e4SLinus Torvalds for (cpu = 0; cpu < NR_CPUS; cpu++) 20631da177e4SLinus Torvalds counter += per_cpu(sockets_in_use, cpu); 20641da177e4SLinus Torvalds 20651da177e4SLinus Torvalds /* It can be negative, by the way. 8) */ 20661da177e4SLinus Torvalds if (counter < 0) 20671da177e4SLinus Torvalds counter = 0; 20681da177e4SLinus Torvalds 20691da177e4SLinus Torvalds seq_printf(seq, "sockets: used %d\n", counter); 20701da177e4SLinus Torvalds } 20711da177e4SLinus Torvalds #endif /* CONFIG_PROC_FS */ 20721da177e4SLinus Torvalds 20731da177e4SLinus Torvalds /* ABI emulation layers need these two */ 20741da177e4SLinus Torvalds EXPORT_SYMBOL(move_addr_to_kernel); 20751da177e4SLinus Torvalds EXPORT_SYMBOL(move_addr_to_user); 20761da177e4SLinus Torvalds EXPORT_SYMBOL(sock_create); 20771da177e4SLinus Torvalds EXPORT_SYMBOL(sock_create_kern); 20781da177e4SLinus Torvalds EXPORT_SYMBOL(sock_create_lite); 20791da177e4SLinus Torvalds EXPORT_SYMBOL(sock_map_fd); 20801da177e4SLinus Torvalds EXPORT_SYMBOL(sock_recvmsg); 20811da177e4SLinus Torvalds EXPORT_SYMBOL(sock_register); 20821da177e4SLinus Torvalds EXPORT_SYMBOL(sock_release); 20831da177e4SLinus Torvalds EXPORT_SYMBOL(sock_sendmsg); 20841da177e4SLinus Torvalds EXPORT_SYMBOL(sock_unregister); 20851da177e4SLinus Torvalds EXPORT_SYMBOL(sock_wake_async); 20861da177e4SLinus Torvalds EXPORT_SYMBOL(sockfd_lookup); 20871da177e4SLinus Torvalds EXPORT_SYMBOL(kernel_sendmsg); 20881da177e4SLinus Torvalds EXPORT_SYMBOL(kernel_recvmsg); 2089