11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * NET An implementation of the SOCKET network access protocol. 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Version: @(#)socket.c 1.1.93 18/02/95 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Authors: Orest Zborowski, <obz@Kodak.COM> 702c30a84SJesper Juhl * Ross Biro 81da177e4SLinus Torvalds * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * Fixes: 111da177e4SLinus Torvalds * Anonymous : NOTSOCK/BADF cleanup. Error fix in 121da177e4SLinus Torvalds * shutdown() 131da177e4SLinus Torvalds * Alan Cox : verify_area() fixes 141da177e4SLinus Torvalds * Alan Cox : Removed DDI 151da177e4SLinus Torvalds * Jonathan Kamens : SOCK_DGRAM reconnect bug 161da177e4SLinus Torvalds * Alan Cox : Moved a load of checks to the very 171da177e4SLinus Torvalds * top level. 181da177e4SLinus Torvalds * Alan Cox : Move address structures to/from user 191da177e4SLinus Torvalds * mode above the protocol layers. 201da177e4SLinus Torvalds * Rob Janssen : Allow 0 length sends. 211da177e4SLinus Torvalds * Alan Cox : Asynchronous I/O support (cribbed from the 221da177e4SLinus Torvalds * tty drivers). 231da177e4SLinus Torvalds * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style) 241da177e4SLinus Torvalds * Jeff Uphoff : Made max number of sockets command-line 251da177e4SLinus Torvalds * configurable. 261da177e4SLinus Torvalds * Matti Aarnio : Made the number of sockets dynamic, 271da177e4SLinus Torvalds * to be allocated when needed, and mr. 281da177e4SLinus Torvalds * Uphoff's max is used as max to be 291da177e4SLinus Torvalds * allowed to allocate. 301da177e4SLinus Torvalds * Linus : Argh. removed all the socket allocation 311da177e4SLinus Torvalds * altogether: it's in the inode now. 321da177e4SLinus Torvalds * Alan Cox : Made sock_alloc()/sock_release() public 331da177e4SLinus Torvalds * for NetROM and future kernel nfsd type 341da177e4SLinus Torvalds * stuff. 351da177e4SLinus Torvalds * Alan Cox : sendmsg/recvmsg basics. 361da177e4SLinus Torvalds * Tom Dyas : Export net symbols. 371da177e4SLinus Torvalds * Marcin Dalecki : Fixed problems with CONFIG_NET="n". 381da177e4SLinus Torvalds * Alan Cox : Added thread locking to sys_* calls 391da177e4SLinus Torvalds * for sockets. May have errors at the 401da177e4SLinus Torvalds * moment. 411da177e4SLinus Torvalds * Kevin Buhr : Fixed the dumb errors in the above. 421da177e4SLinus Torvalds * Andi Kleen : Some small cleanups, optimizations, 431da177e4SLinus Torvalds * and fixed a copy_from_user() bug. 441da177e4SLinus Torvalds * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0) 451da177e4SLinus Torvalds * Tigran Aivazian : Made listen(2) backlog sanity checks 461da177e4SLinus Torvalds * protocol-independent 471da177e4SLinus Torvalds * 481da177e4SLinus Torvalds * 491da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 501da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 511da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 521da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 531da177e4SLinus Torvalds * 541da177e4SLinus Torvalds * 551da177e4SLinus Torvalds * This module is effectively the top level interface to the BSD socket 561da177e4SLinus Torvalds * paradigm. 571da177e4SLinus Torvalds * 581da177e4SLinus Torvalds * Based upon Swansea University Computer Society NET3.039 591da177e4SLinus Torvalds */ 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds #include <linux/mm.h> 621da177e4SLinus Torvalds #include <linux/socket.h> 631da177e4SLinus Torvalds #include <linux/file.h> 641da177e4SLinus Torvalds #include <linux/net.h> 651da177e4SLinus Torvalds #include <linux/interrupt.h> 66aaca0bdcSUlrich Drepper #include <linux/thread_info.h> 6755737fdaSStephen Hemminger #include <linux/rcupdate.h> 681da177e4SLinus Torvalds #include <linux/netdevice.h> 691da177e4SLinus Torvalds #include <linux/proc_fs.h> 701da177e4SLinus Torvalds #include <linux/seq_file.h> 714a3e2f71SArjan van de Ven #include <linux/mutex.h> 721da177e4SLinus Torvalds #include <linux/if_bridge.h> 7320380731SArnaldo Carvalho de Melo #include <linux/if_frad.h> 7420380731SArnaldo Carvalho de Melo #include <linux/if_vlan.h> 75408eccceSDaniel Borkmann #include <linux/ptp_classify.h> 761da177e4SLinus Torvalds #include <linux/init.h> 771da177e4SLinus Torvalds #include <linux/poll.h> 781da177e4SLinus Torvalds #include <linux/cache.h> 791da177e4SLinus Torvalds #include <linux/module.h> 801da177e4SLinus Torvalds #include <linux/highmem.h> 811da177e4SLinus Torvalds #include <linux/mount.h> 821da177e4SLinus Torvalds #include <linux/security.h> 831da177e4SLinus Torvalds #include <linux/syscalls.h> 841da177e4SLinus Torvalds #include <linux/compat.h> 851da177e4SLinus Torvalds #include <linux/kmod.h> 863ec3b2fbSDavid Woodhouse #include <linux/audit.h> 87d86b5e0eSAdrian Bunk #include <linux/wireless.h> 881b8d7ae4SEric W. Biederman #include <linux/nsproxy.h> 891fd7317dSNick Black #include <linux/magic.h> 905a0e3ad6STejun Heo #include <linux/slab.h> 91600e1779SMasatake YAMATO #include <linux/xattr.h> 921da177e4SLinus Torvalds 937c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 941da177e4SLinus Torvalds #include <asm/unistd.h> 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds #include <net/compat.h> 9787de87d5SDavid S. Miller #include <net/wext.h> 98f8451725SHerbert Xu #include <net/cls_cgroup.h> 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds #include <net/sock.h> 1011da177e4SLinus Torvalds #include <linux/netfilter.h> 1021da177e4SLinus Torvalds 1036b96018bSArnd Bergmann #include <linux/if_tun.h> 1046b96018bSArnd Bergmann #include <linux/ipv6_route.h> 1056b96018bSArnd Bergmann #include <linux/route.h> 1066b96018bSArnd Bergmann #include <linux/sockios.h> 1076b96018bSArnd Bergmann #include <linux/atalk.h> 108076bb0c8SEliezer Tamir #include <net/busy_poll.h> 109f24b9be5SWillem de Bruijn #include <linux/errqueue.h> 11006021292SEliezer Tamir 111e0d1095aSCong Wang #ifdef CONFIG_NET_RX_BUSY_POLL 11264b0dc51SEliezer Tamir unsigned int sysctl_net_busy_read __read_mostly; 11364b0dc51SEliezer Tamir unsigned int sysctl_net_busy_poll __read_mostly; 11406021292SEliezer Tamir #endif 1156b96018bSArnd Bergmann 1168ae5e030SAl Viro static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to); 1178ae5e030SAl Viro static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from); 1181da177e4SLinus Torvalds static int sock_mmap(struct file *file, struct vm_area_struct *vma); 1191da177e4SLinus Torvalds 1201da177e4SLinus Torvalds static int sock_close(struct inode *inode, struct file *file); 121ade994f4SAl Viro static __poll_t sock_poll(struct file *file, 1221da177e4SLinus Torvalds struct poll_table_struct *wait); 12389bddce5SStephen Hemminger static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 12489bbfc95SShaun Pereira #ifdef CONFIG_COMPAT 12589bbfc95SShaun Pereira static long compat_sock_ioctl(struct file *file, 12689bbfc95SShaun Pereira unsigned int cmd, unsigned long arg); 12789bbfc95SShaun Pereira #endif 1281da177e4SLinus Torvalds static int sock_fasync(int fd, struct file *filp, int on); 1291da177e4SLinus Torvalds static ssize_t sock_sendpage(struct file *file, struct page *page, 1301da177e4SLinus Torvalds int offset, size_t size, loff_t *ppos, int more); 1319c55e01cSJens Axboe static ssize_t sock_splice_read(struct file *file, loff_t *ppos, 1329c55e01cSJens Axboe struct pipe_inode_info *pipe, size_t len, 1339c55e01cSJens Axboe unsigned int flags); 1341da177e4SLinus Torvalds 1351da177e4SLinus Torvalds /* 1361da177e4SLinus Torvalds * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear 1371da177e4SLinus Torvalds * in the operation structures but are done directly via the socketcall() multiplexor. 1381da177e4SLinus Torvalds */ 1391da177e4SLinus Torvalds 140da7071d7SArjan van de Ven static const struct file_operations socket_file_ops = { 1411da177e4SLinus Torvalds .owner = THIS_MODULE, 1421da177e4SLinus Torvalds .llseek = no_llseek, 1438ae5e030SAl Viro .read_iter = sock_read_iter, 1448ae5e030SAl Viro .write_iter = sock_write_iter, 1451da177e4SLinus Torvalds .poll = sock_poll, 1461da177e4SLinus Torvalds .unlocked_ioctl = sock_ioctl, 14789bbfc95SShaun Pereira #ifdef CONFIG_COMPAT 14889bbfc95SShaun Pereira .compat_ioctl = compat_sock_ioctl, 14989bbfc95SShaun Pereira #endif 1501da177e4SLinus Torvalds .mmap = sock_mmap, 1511da177e4SLinus Torvalds .release = sock_close, 1521da177e4SLinus Torvalds .fasync = sock_fasync, 1535274f052SJens Axboe .sendpage = sock_sendpage, 1545274f052SJens Axboe .splice_write = generic_splice_sendpage, 1559c55e01cSJens Axboe .splice_read = sock_splice_read, 1561da177e4SLinus Torvalds }; 1571da177e4SLinus Torvalds 1581da177e4SLinus Torvalds /* 1591da177e4SLinus Torvalds * The protocol list. Each protocol is registered in here. 1601da177e4SLinus Torvalds */ 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds static DEFINE_SPINLOCK(net_family_lock); 163190683a9SEric Dumazet static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly; 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds /* 16689bddce5SStephen Hemminger * Support routines. 16789bddce5SStephen Hemminger * Move socket addresses back and forth across the kernel/user 1681da177e4SLinus Torvalds * divide and look after the messy bits. 1691da177e4SLinus Torvalds */ 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvalds /** 1721da177e4SLinus Torvalds * move_addr_to_kernel - copy a socket address into kernel space 1731da177e4SLinus Torvalds * @uaddr: Address in user space 1741da177e4SLinus Torvalds * @kaddr: Address in kernel space 1751da177e4SLinus Torvalds * @ulen: Length in user space 1761da177e4SLinus Torvalds * 1771da177e4SLinus Torvalds * The address is copied into kernel space. If the provided address is 1781da177e4SLinus Torvalds * too long an error code of -EINVAL is returned. If the copy gives 1791da177e4SLinus Torvalds * invalid addresses -EFAULT is returned. On a success 0 is returned. 1801da177e4SLinus Torvalds */ 1811da177e4SLinus Torvalds 18243db362dSMaciej Żenczykowski int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr) 1831da177e4SLinus Torvalds { 184230b1839SYOSHIFUJI Hideaki if (ulen < 0 || ulen > sizeof(struct sockaddr_storage)) 1851da177e4SLinus Torvalds return -EINVAL; 1861da177e4SLinus Torvalds if (ulen == 0) 1871da177e4SLinus Torvalds return 0; 1881da177e4SLinus Torvalds if (copy_from_user(kaddr, uaddr, ulen)) 1891da177e4SLinus Torvalds return -EFAULT; 1903ec3b2fbSDavid Woodhouse return audit_sockaddr(ulen, kaddr); 1911da177e4SLinus Torvalds } 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvalds /** 1941da177e4SLinus Torvalds * move_addr_to_user - copy an address to user space 1951da177e4SLinus Torvalds * @kaddr: kernel space address 1961da177e4SLinus Torvalds * @klen: length of address in kernel 1971da177e4SLinus Torvalds * @uaddr: user space address 1981da177e4SLinus Torvalds * @ulen: pointer to user length field 1991da177e4SLinus Torvalds * 2001da177e4SLinus Torvalds * The value pointed to by ulen on entry is the buffer length available. 2011da177e4SLinus Torvalds * This is overwritten with the buffer space used. -EINVAL is returned 2021da177e4SLinus Torvalds * if an overlong buffer is specified or a negative buffer size. -EFAULT 2031da177e4SLinus Torvalds * is returned if either the buffer or the length field are not 2041da177e4SLinus Torvalds * accessible. 2051da177e4SLinus Torvalds * After copying the data up to the limit the user specifies, the true 2061da177e4SLinus Torvalds * length of the data is written over the length limit the user 2071da177e4SLinus Torvalds * specified. Zero is returned for a success. 2081da177e4SLinus Torvalds */ 2091da177e4SLinus Torvalds 21043db362dSMaciej Żenczykowski static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen, 21111165f14Sstephen hemminger void __user *uaddr, int __user *ulen) 2121da177e4SLinus Torvalds { 2131da177e4SLinus Torvalds int err; 2141da177e4SLinus Torvalds int len; 2151da177e4SLinus Torvalds 21668c6beb3SHannes Frederic Sowa BUG_ON(klen > sizeof(struct sockaddr_storage)); 21789bddce5SStephen Hemminger err = get_user(len, ulen); 21889bddce5SStephen Hemminger if (err) 2191da177e4SLinus Torvalds return err; 2201da177e4SLinus Torvalds if (len > klen) 2211da177e4SLinus Torvalds len = klen; 22268c6beb3SHannes Frederic Sowa if (len < 0) 2231da177e4SLinus Torvalds return -EINVAL; 22489bddce5SStephen Hemminger if (len) { 225d6fe3945SSteve Grubb if (audit_sockaddr(klen, kaddr)) 226d6fe3945SSteve Grubb return -ENOMEM; 2271da177e4SLinus Torvalds if (copy_to_user(uaddr, kaddr, len)) 2281da177e4SLinus Torvalds return -EFAULT; 2291da177e4SLinus Torvalds } 2301da177e4SLinus Torvalds /* 2311da177e4SLinus Torvalds * "fromlen shall refer to the value before truncation.." 2321da177e4SLinus Torvalds * 1003.1g 2331da177e4SLinus Torvalds */ 2341da177e4SLinus Torvalds return __put_user(klen, ulen); 2351da177e4SLinus Torvalds } 2361da177e4SLinus Torvalds 237e18b890bSChristoph Lameter static struct kmem_cache *sock_inode_cachep __read_mostly; 2381da177e4SLinus Torvalds 2391da177e4SLinus Torvalds static struct inode *sock_alloc_inode(struct super_block *sb) 2401da177e4SLinus Torvalds { 2411da177e4SLinus Torvalds struct socket_alloc *ei; 242eaefd110SEric Dumazet struct socket_wq *wq; 24389bddce5SStephen Hemminger 244e94b1766SChristoph Lameter ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL); 2451da177e4SLinus Torvalds if (!ei) 2461da177e4SLinus Torvalds return NULL; 247eaefd110SEric Dumazet wq = kmalloc(sizeof(*wq), GFP_KERNEL); 248eaefd110SEric Dumazet if (!wq) { 24943815482SEric Dumazet kmem_cache_free(sock_inode_cachep, ei); 25043815482SEric Dumazet return NULL; 25143815482SEric Dumazet } 252eaefd110SEric Dumazet init_waitqueue_head(&wq->wait); 253eaefd110SEric Dumazet wq->fasync_list = NULL; 254574aab1eSNicolai Stange wq->flags = 0; 255eaefd110SEric Dumazet RCU_INIT_POINTER(ei->socket.wq, wq); 2561da177e4SLinus Torvalds 2571da177e4SLinus Torvalds ei->socket.state = SS_UNCONNECTED; 2581da177e4SLinus Torvalds ei->socket.flags = 0; 2591da177e4SLinus Torvalds ei->socket.ops = NULL; 2601da177e4SLinus Torvalds ei->socket.sk = NULL; 2611da177e4SLinus Torvalds ei->socket.file = NULL; 2621da177e4SLinus Torvalds 2631da177e4SLinus Torvalds return &ei->vfs_inode; 2641da177e4SLinus Torvalds } 2651da177e4SLinus Torvalds 2661da177e4SLinus Torvalds static void sock_destroy_inode(struct inode *inode) 2671da177e4SLinus Torvalds { 26843815482SEric Dumazet struct socket_alloc *ei; 269eaefd110SEric Dumazet struct socket_wq *wq; 27043815482SEric Dumazet 27143815482SEric Dumazet ei = container_of(inode, struct socket_alloc, vfs_inode); 272eaefd110SEric Dumazet wq = rcu_dereference_protected(ei->socket.wq, 1); 27361845220SLai Jiangshan kfree_rcu(wq, rcu); 27443815482SEric Dumazet kmem_cache_free(sock_inode_cachep, ei); 2751da177e4SLinus Torvalds } 2761da177e4SLinus Torvalds 27751cc5068SAlexey Dobriyan static void init_once(void *foo) 2781da177e4SLinus Torvalds { 2791da177e4SLinus Torvalds struct socket_alloc *ei = (struct socket_alloc *)foo; 2801da177e4SLinus Torvalds 2811da177e4SLinus Torvalds inode_init_once(&ei->vfs_inode); 2821da177e4SLinus Torvalds } 2831da177e4SLinus Torvalds 2841e911632Syuan linyu static void init_inodecache(void) 2851da177e4SLinus Torvalds { 2861da177e4SLinus Torvalds sock_inode_cachep = kmem_cache_create("sock_inode_cache", 2871da177e4SLinus Torvalds sizeof(struct socket_alloc), 28889bddce5SStephen Hemminger 0, 28989bddce5SStephen Hemminger (SLAB_HWCACHE_ALIGN | 29089bddce5SStephen Hemminger SLAB_RECLAIM_ACCOUNT | 2915d097056SVladimir Davydov SLAB_MEM_SPREAD | SLAB_ACCOUNT), 29220c2df83SPaul Mundt init_once); 2931e911632Syuan linyu BUG_ON(sock_inode_cachep == NULL); 2941da177e4SLinus Torvalds } 2951da177e4SLinus Torvalds 296b87221deSAlexey Dobriyan static const struct super_operations sockfs_ops = { 2971da177e4SLinus Torvalds .alloc_inode = sock_alloc_inode, 2981da177e4SLinus Torvalds .destroy_inode = sock_destroy_inode, 2991da177e4SLinus Torvalds .statfs = simple_statfs, 3001da177e4SLinus Torvalds }; 3011da177e4SLinus Torvalds 302c23fbb6bSEric Dumazet /* 303c23fbb6bSEric Dumazet * sockfs_dname() is called from d_path(). 304c23fbb6bSEric Dumazet */ 305c23fbb6bSEric Dumazet static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen) 306c23fbb6bSEric Dumazet { 307c23fbb6bSEric Dumazet return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]", 308c5ef6035SDavid Howells d_inode(dentry)->i_ino); 309c23fbb6bSEric Dumazet } 310c23fbb6bSEric Dumazet 3113ba13d17SAl Viro static const struct dentry_operations sockfs_dentry_operations = { 312c23fbb6bSEric Dumazet .d_dname = sockfs_dname, 3131da177e4SLinus Torvalds }; 3141da177e4SLinus Torvalds 315bba0bd31SAndreas Gruenbacher static int sockfs_xattr_get(const struct xattr_handler *handler, 316bba0bd31SAndreas Gruenbacher struct dentry *dentry, struct inode *inode, 317bba0bd31SAndreas Gruenbacher const char *suffix, void *value, size_t size) 318bba0bd31SAndreas Gruenbacher { 319bba0bd31SAndreas Gruenbacher if (value) { 320bba0bd31SAndreas Gruenbacher if (dentry->d_name.len + 1 > size) 321bba0bd31SAndreas Gruenbacher return -ERANGE; 322bba0bd31SAndreas Gruenbacher memcpy(value, dentry->d_name.name, dentry->d_name.len + 1); 323bba0bd31SAndreas Gruenbacher } 324bba0bd31SAndreas Gruenbacher return dentry->d_name.len + 1; 325bba0bd31SAndreas Gruenbacher } 326bba0bd31SAndreas Gruenbacher 327bba0bd31SAndreas Gruenbacher #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname" 328bba0bd31SAndreas Gruenbacher #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX) 329bba0bd31SAndreas Gruenbacher #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1) 330bba0bd31SAndreas Gruenbacher 331bba0bd31SAndreas Gruenbacher static const struct xattr_handler sockfs_xattr_handler = { 332bba0bd31SAndreas Gruenbacher .name = XATTR_NAME_SOCKPROTONAME, 333bba0bd31SAndreas Gruenbacher .get = sockfs_xattr_get, 334bba0bd31SAndreas Gruenbacher }; 335bba0bd31SAndreas Gruenbacher 3364a590153SAndreas Gruenbacher static int sockfs_security_xattr_set(const struct xattr_handler *handler, 3374a590153SAndreas Gruenbacher struct dentry *dentry, struct inode *inode, 3384a590153SAndreas Gruenbacher const char *suffix, const void *value, 3394a590153SAndreas Gruenbacher size_t size, int flags) 3404a590153SAndreas Gruenbacher { 3414a590153SAndreas Gruenbacher /* Handled by LSM. */ 3424a590153SAndreas Gruenbacher return -EAGAIN; 3434a590153SAndreas Gruenbacher } 3444a590153SAndreas Gruenbacher 3454a590153SAndreas Gruenbacher static const struct xattr_handler sockfs_security_xattr_handler = { 3464a590153SAndreas Gruenbacher .prefix = XATTR_SECURITY_PREFIX, 3474a590153SAndreas Gruenbacher .set = sockfs_security_xattr_set, 3484a590153SAndreas Gruenbacher }; 3494a590153SAndreas Gruenbacher 350bba0bd31SAndreas Gruenbacher static const struct xattr_handler *sockfs_xattr_handlers[] = { 351bba0bd31SAndreas Gruenbacher &sockfs_xattr_handler, 3524a590153SAndreas Gruenbacher &sockfs_security_xattr_handler, 353bba0bd31SAndreas Gruenbacher NULL 354bba0bd31SAndreas Gruenbacher }; 355bba0bd31SAndreas Gruenbacher 356c74a1cbbSAl Viro static struct dentry *sockfs_mount(struct file_system_type *fs_type, 357c74a1cbbSAl Viro int flags, const char *dev_name, void *data) 358c74a1cbbSAl Viro { 359bba0bd31SAndreas Gruenbacher return mount_pseudo_xattr(fs_type, "socket:", &sockfs_ops, 360bba0bd31SAndreas Gruenbacher sockfs_xattr_handlers, 361c74a1cbbSAl Viro &sockfs_dentry_operations, SOCKFS_MAGIC); 362c74a1cbbSAl Viro } 363c74a1cbbSAl Viro 364c74a1cbbSAl Viro static struct vfsmount *sock_mnt __read_mostly; 365c74a1cbbSAl Viro 366c74a1cbbSAl Viro static struct file_system_type sock_fs_type = { 367c74a1cbbSAl Viro .name = "sockfs", 368c74a1cbbSAl Viro .mount = sockfs_mount, 369c74a1cbbSAl Viro .kill_sb = kill_anon_super, 370c74a1cbbSAl Viro }; 371c74a1cbbSAl Viro 3721da177e4SLinus Torvalds /* 3731da177e4SLinus Torvalds * Obtains the first available file descriptor and sets it up for use. 3741da177e4SLinus Torvalds * 37539d8c1b6SDavid S. Miller * These functions create file structures and maps them to fd space 37639d8c1b6SDavid S. Miller * of the current process. On success it returns file descriptor 3771da177e4SLinus Torvalds * and file struct implicitly stored in sock->file. 3781da177e4SLinus Torvalds * Note that another thread may close file descriptor before we return 3791da177e4SLinus Torvalds * from this function. We use the fact that now we do not refer 3801da177e4SLinus Torvalds * to socket after mapping. If one day we will need it, this 3811da177e4SLinus Torvalds * function will increment ref. count on file by 1. 3821da177e4SLinus Torvalds * 3831da177e4SLinus Torvalds * In any case returned fd MAY BE not valid! 3841da177e4SLinus Torvalds * This race condition is unavoidable 3851da177e4SLinus Torvalds * with shared fd spaces, we cannot solve it inside kernel, 3861da177e4SLinus Torvalds * but we take care of internal coherence yet. 3871da177e4SLinus Torvalds */ 3881da177e4SLinus Torvalds 389aab174f0SLinus Torvalds struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname) 3901da177e4SLinus Torvalds { 3917cbe66b6SAl Viro struct qstr name = { .name = "" }; 3922c48b9c4SAl Viro struct path path; 3937cbe66b6SAl Viro struct file *file; 3941da177e4SLinus Torvalds 395600e1779SMasatake YAMATO if (dname) { 396600e1779SMasatake YAMATO name.name = dname; 397600e1779SMasatake YAMATO name.len = strlen(name.name); 398600e1779SMasatake YAMATO } else if (sock->sk) { 399600e1779SMasatake YAMATO name.name = sock->sk->sk_prot_creator->name; 400600e1779SMasatake YAMATO name.len = strlen(name.name); 401600e1779SMasatake YAMATO } 4024b936885SNick Piggin path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name); 4038e1611e2SAl Viro if (unlikely(!path.dentry)) { 4048e1611e2SAl Viro sock_release(sock); 40528407630SAl Viro return ERR_PTR(-ENOMEM); 4068e1611e2SAl Viro } 4072c48b9c4SAl Viro path.mnt = mntget(sock_mnt); 40839d8c1b6SDavid S. Miller 4092c48b9c4SAl Viro d_instantiate(path.dentry, SOCK_INODE(sock)); 410cc3808f8SAl Viro 4112c48b9c4SAl Viro file = alloc_file(&path, FMODE_READ | FMODE_WRITE, 412cc3808f8SAl Viro &socket_file_ops); 413b5ffe634SViresh Kumar if (IS_ERR(file)) { 4148e1611e2SAl Viro /* drop dentry, keep inode for a bit */ 415c5ef6035SDavid Howells ihold(d_inode(path.dentry)); 4162c48b9c4SAl Viro path_put(&path); 4178e1611e2SAl Viro /* ... and now kill it properly */ 4188e1611e2SAl Viro sock_release(sock); 41939b65252SAnatol Pomozov return file; 420cc3808f8SAl Viro } 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds sock->file = file; 42377d27200SUlrich Drepper file->f_flags = O_RDWR | (flags & O_NONBLOCK); 42407dc3f07SBenjamin LaHaise file->private_data = sock; 42528407630SAl Viro return file; 4261da177e4SLinus Torvalds } 42756b31d1cSAl Viro EXPORT_SYMBOL(sock_alloc_file); 4281da177e4SLinus Torvalds 42956b31d1cSAl Viro static int sock_map_fd(struct socket *sock, int flags) 43039d8c1b6SDavid S. Miller { 43139d8c1b6SDavid S. Miller struct file *newfile; 43228407630SAl Viro int fd = get_unused_fd_flags(flags); 433ce4bb04cSAl Viro if (unlikely(fd < 0)) { 434ce4bb04cSAl Viro sock_release(sock); 4351da177e4SLinus Torvalds return fd; 436ce4bb04cSAl Viro } 4371da177e4SLinus Torvalds 438aab174f0SLinus Torvalds newfile = sock_alloc_file(sock, flags, NULL); 43928407630SAl Viro if (likely(!IS_ERR(newfile))) { 4401da177e4SLinus Torvalds fd_install(fd, newfile); 4411da177e4SLinus Torvalds return fd; 4421da177e4SLinus Torvalds } 44328407630SAl Viro 44428407630SAl Viro put_unused_fd(fd); 44528407630SAl Viro return PTR_ERR(newfile); 4461da177e4SLinus Torvalds } 4471da177e4SLinus Torvalds 448406a3c63SJohn Fastabend struct socket *sock_from_file(struct file *file, int *err) 4496cb153caSBenjamin LaHaise { 4506cb153caSBenjamin LaHaise if (file->f_op == &socket_file_ops) 4516cb153caSBenjamin LaHaise return file->private_data; /* set in sock_map_fd */ 4526cb153caSBenjamin LaHaise 4536cb153caSBenjamin LaHaise *err = -ENOTSOCK; 4546cb153caSBenjamin LaHaise return NULL; 4556cb153caSBenjamin LaHaise } 456406a3c63SJohn Fastabend EXPORT_SYMBOL(sock_from_file); 4576cb153caSBenjamin LaHaise 4581da177e4SLinus Torvalds /** 4591da177e4SLinus Torvalds * sockfd_lookup - Go from a file number to its socket slot 4601da177e4SLinus Torvalds * @fd: file handle 4611da177e4SLinus Torvalds * @err: pointer to an error code return 4621da177e4SLinus Torvalds * 4631da177e4SLinus Torvalds * The file handle passed in is locked and the socket it is bound 464241c4667SRosen, Rami * to is returned. If an error occurs the err pointer is overwritten 4651da177e4SLinus Torvalds * with a negative errno code and NULL is returned. The function checks 4661da177e4SLinus Torvalds * for both invalid handles and passing a handle which is not a socket. 4671da177e4SLinus Torvalds * 4681da177e4SLinus Torvalds * On a success the socket object pointer is returned. 4691da177e4SLinus Torvalds */ 4701da177e4SLinus Torvalds 4711da177e4SLinus Torvalds struct socket *sockfd_lookup(int fd, int *err) 4721da177e4SLinus Torvalds { 4731da177e4SLinus Torvalds struct file *file; 4741da177e4SLinus Torvalds struct socket *sock; 4751da177e4SLinus Torvalds 47689bddce5SStephen Hemminger file = fget(fd); 47789bddce5SStephen Hemminger if (!file) { 4781da177e4SLinus Torvalds *err = -EBADF; 4791da177e4SLinus Torvalds return NULL; 4801da177e4SLinus Torvalds } 48189bddce5SStephen Hemminger 4826cb153caSBenjamin LaHaise sock = sock_from_file(file, err); 4836cb153caSBenjamin LaHaise if (!sock) 4841da177e4SLinus Torvalds fput(file); 4856cb153caSBenjamin LaHaise return sock; 4861da177e4SLinus Torvalds } 487c6d409cfSEric Dumazet EXPORT_SYMBOL(sockfd_lookup); 4881da177e4SLinus Torvalds 4896cb153caSBenjamin LaHaise static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) 4906cb153caSBenjamin LaHaise { 49100e188efSAl Viro struct fd f = fdget(fd); 4926cb153caSBenjamin LaHaise struct socket *sock; 4936cb153caSBenjamin LaHaise 4943672558cSHua Zhong *err = -EBADF; 49500e188efSAl Viro if (f.file) { 49600e188efSAl Viro sock = sock_from_file(f.file, err); 49700e188efSAl Viro if (likely(sock)) { 49800e188efSAl Viro *fput_needed = f.flags; 4991da177e4SLinus Torvalds return sock; 50000e188efSAl Viro } 50100e188efSAl Viro fdput(f); 5026cb153caSBenjamin LaHaise } 5036cb153caSBenjamin LaHaise return NULL; 5041da177e4SLinus Torvalds } 5051da177e4SLinus Torvalds 506600e1779SMasatake YAMATO static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer, 507600e1779SMasatake YAMATO size_t size) 508600e1779SMasatake YAMATO { 509600e1779SMasatake YAMATO ssize_t len; 510600e1779SMasatake YAMATO ssize_t used = 0; 511600e1779SMasatake YAMATO 512c5ef6035SDavid Howells len = security_inode_listsecurity(d_inode(dentry), buffer, size); 513600e1779SMasatake YAMATO if (len < 0) 514600e1779SMasatake YAMATO return len; 515600e1779SMasatake YAMATO used += len; 516600e1779SMasatake YAMATO if (buffer) { 517600e1779SMasatake YAMATO if (size < used) 518600e1779SMasatake YAMATO return -ERANGE; 519600e1779SMasatake YAMATO buffer += len; 520600e1779SMasatake YAMATO } 521600e1779SMasatake YAMATO 522600e1779SMasatake YAMATO len = (XATTR_NAME_SOCKPROTONAME_LEN + 1); 523600e1779SMasatake YAMATO used += len; 524600e1779SMasatake YAMATO if (buffer) { 525600e1779SMasatake YAMATO if (size < used) 526600e1779SMasatake YAMATO return -ERANGE; 527600e1779SMasatake YAMATO memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len); 528600e1779SMasatake YAMATO buffer += len; 529600e1779SMasatake YAMATO } 530600e1779SMasatake YAMATO 531600e1779SMasatake YAMATO return used; 532600e1779SMasatake YAMATO } 533600e1779SMasatake YAMATO 534dc647ec8STobias Klauser static int sockfs_setattr(struct dentry *dentry, struct iattr *iattr) 53586741ec2SLorenzo Colitti { 53686741ec2SLorenzo Colitti int err = simple_setattr(dentry, iattr); 53786741ec2SLorenzo Colitti 538e1a3a60aSEric Biggers if (!err && (iattr->ia_valid & ATTR_UID)) { 53986741ec2SLorenzo Colitti struct socket *sock = SOCKET_I(d_inode(dentry)); 54086741ec2SLorenzo Colitti 54186741ec2SLorenzo Colitti sock->sk->sk_uid = iattr->ia_uid; 54286741ec2SLorenzo Colitti } 54386741ec2SLorenzo Colitti 54486741ec2SLorenzo Colitti return err; 54586741ec2SLorenzo Colitti } 54686741ec2SLorenzo Colitti 547600e1779SMasatake YAMATO static const struct inode_operations sockfs_inode_ops = { 548600e1779SMasatake YAMATO .listxattr = sockfs_listxattr, 54986741ec2SLorenzo Colitti .setattr = sockfs_setattr, 550600e1779SMasatake YAMATO }; 551600e1779SMasatake YAMATO 5521da177e4SLinus Torvalds /** 5531da177e4SLinus Torvalds * sock_alloc - allocate a socket 5541da177e4SLinus Torvalds * 5551da177e4SLinus Torvalds * Allocate a new inode and socket object. The two are bound together 5561da177e4SLinus Torvalds * and initialised. The socket is then returned. If we are out of inodes 5571da177e4SLinus Torvalds * NULL is returned. 5581da177e4SLinus Torvalds */ 5591da177e4SLinus Torvalds 560f4a00aacSTom Herbert struct socket *sock_alloc(void) 5611da177e4SLinus Torvalds { 5621da177e4SLinus Torvalds struct inode *inode; 5631da177e4SLinus Torvalds struct socket *sock; 5641da177e4SLinus Torvalds 565a209dfc7SEric Dumazet inode = new_inode_pseudo(sock_mnt->mnt_sb); 5661da177e4SLinus Torvalds if (!inode) 5671da177e4SLinus Torvalds return NULL; 5681da177e4SLinus Torvalds 5691da177e4SLinus Torvalds sock = SOCKET_I(inode); 5701da177e4SLinus Torvalds 57185fe4025SChristoph Hellwig inode->i_ino = get_next_ino(); 5721da177e4SLinus Torvalds inode->i_mode = S_IFSOCK | S_IRWXUGO; 5738192b0c4SDavid Howells inode->i_uid = current_fsuid(); 5748192b0c4SDavid Howells inode->i_gid = current_fsgid(); 575600e1779SMasatake YAMATO inode->i_op = &sockfs_inode_ops; 5761da177e4SLinus Torvalds 5771da177e4SLinus Torvalds return sock; 5781da177e4SLinus Torvalds } 579f4a00aacSTom Herbert EXPORT_SYMBOL(sock_alloc); 5801da177e4SLinus Torvalds 5811da177e4SLinus Torvalds /** 5821da177e4SLinus Torvalds * sock_release - close a socket 5831da177e4SLinus Torvalds * @sock: socket to close 5841da177e4SLinus Torvalds * 5851da177e4SLinus Torvalds * The socket is released from the protocol stack if it has a release 5861da177e4SLinus Torvalds * callback, and the inode is then released if the socket is bound to 5871da177e4SLinus Torvalds * an inode not a file. 5881da177e4SLinus Torvalds */ 5891da177e4SLinus Torvalds 5901da177e4SLinus Torvalds void sock_release(struct socket *sock) 5911da177e4SLinus Torvalds { 5921da177e4SLinus Torvalds if (sock->ops) { 5931da177e4SLinus Torvalds struct module *owner = sock->ops->owner; 5941da177e4SLinus Torvalds 5951da177e4SLinus Torvalds sock->ops->release(sock); 5961da177e4SLinus Torvalds sock->ops = NULL; 5971da177e4SLinus Torvalds module_put(owner); 5981da177e4SLinus Torvalds } 5991da177e4SLinus Torvalds 600eaefd110SEric Dumazet if (rcu_dereference_protected(sock->wq, 1)->fasync_list) 6013410f22eSYang Yingliang pr_err("%s: fasync list not empty!\n", __func__); 6021da177e4SLinus Torvalds 6031da177e4SLinus Torvalds if (!sock->file) { 6041da177e4SLinus Torvalds iput(SOCK_INODE(sock)); 6051da177e4SLinus Torvalds return; 6061da177e4SLinus Torvalds } 6071da177e4SLinus Torvalds sock->file = NULL; 6081da177e4SLinus Torvalds } 609c6d409cfSEric Dumazet EXPORT_SYMBOL(sock_release); 6101da177e4SLinus Torvalds 611c14ac945SSoheil Hassas Yeganeh void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags) 61220d49473SPatrick Ohly { 613140c55d4SEric Dumazet u8 flags = *tx_flags; 614140c55d4SEric Dumazet 615c14ac945SSoheil Hassas Yeganeh if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE) 616140c55d4SEric Dumazet flags |= SKBTX_HW_TSTAMP; 617140c55d4SEric Dumazet 618c14ac945SSoheil Hassas Yeganeh if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE) 619140c55d4SEric Dumazet flags |= SKBTX_SW_TSTAMP; 620140c55d4SEric Dumazet 621c14ac945SSoheil Hassas Yeganeh if (tsflags & SOF_TIMESTAMPING_TX_SCHED) 622140c55d4SEric Dumazet flags |= SKBTX_SCHED_TSTAMP; 623140c55d4SEric Dumazet 624140c55d4SEric Dumazet *tx_flags = flags; 62520d49473SPatrick Ohly } 62667cc0d40SWillem de Bruijn EXPORT_SYMBOL(__sock_tx_timestamp); 62720d49473SPatrick Ohly 628d8725c86SAl Viro static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg) 6291da177e4SLinus Torvalds { 63001e97e65SAl Viro int ret = sock->ops->sendmsg(sock, msg, msg_data_left(msg)); 631d8725c86SAl Viro BUG_ON(ret == -EIOCBQUEUED); 632d8725c86SAl Viro return ret; 6331da177e4SLinus Torvalds } 6340cf00c6fSGu Zheng 635d8725c86SAl Viro int sock_sendmsg(struct socket *sock, struct msghdr *msg) 6360cf00c6fSGu Zheng { 637d8725c86SAl Viro int err = security_socket_sendmsg(sock, msg, 63801e97e65SAl Viro msg_data_left(msg)); 6391b784140SYing Xue 640d8725c86SAl Viro return err ?: sock_sendmsg_nosec(sock, msg); 6410cf00c6fSGu Zheng } 642c6d409cfSEric Dumazet EXPORT_SYMBOL(sock_sendmsg); 6431da177e4SLinus Torvalds 6441da177e4SLinus Torvalds int kernel_sendmsg(struct socket *sock, struct msghdr *msg, 6451da177e4SLinus Torvalds struct kvec *vec, size_t num, size_t size) 6461da177e4SLinus Torvalds { 6476aa24814SAl Viro iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size); 648d8725c86SAl Viro return sock_sendmsg(sock, msg); 6491da177e4SLinus Torvalds } 650c6d409cfSEric Dumazet EXPORT_SYMBOL(kernel_sendmsg); 6511da177e4SLinus Torvalds 652306b13ebSTom Herbert int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg, 653306b13ebSTom Herbert struct kvec *vec, size_t num, size_t size) 654306b13ebSTom Herbert { 655306b13ebSTom Herbert struct socket *sock = sk->sk_socket; 656306b13ebSTom Herbert 657306b13ebSTom Herbert if (!sock->ops->sendmsg_locked) 658db5980d8SJohn Fastabend return sock_no_sendmsg_locked(sk, msg, size); 659306b13ebSTom Herbert 660306b13ebSTom Herbert iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size); 661306b13ebSTom Herbert 662306b13ebSTom Herbert return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg)); 663306b13ebSTom Herbert } 664306b13ebSTom Herbert EXPORT_SYMBOL(kernel_sendmsg_locked); 665306b13ebSTom Herbert 6668605330aSSoheil Hassas Yeganeh static bool skb_is_err_queue(const struct sk_buff *skb) 6678605330aSSoheil Hassas Yeganeh { 6688605330aSSoheil Hassas Yeganeh /* pkt_type of skbs enqueued on the error queue are set to 6698605330aSSoheil Hassas Yeganeh * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do 6708605330aSSoheil Hassas Yeganeh * in recvmsg, since skbs received on a local socket will never 6718605330aSSoheil Hassas Yeganeh * have a pkt_type of PACKET_OUTGOING. 6728605330aSSoheil Hassas Yeganeh */ 6738605330aSSoheil Hassas Yeganeh return skb->pkt_type == PACKET_OUTGOING; 6748605330aSSoheil Hassas Yeganeh } 6758605330aSSoheil Hassas Yeganeh 676b50a5c70SMiroslav Lichvar /* On transmit, software and hardware timestamps are returned independently. 677b50a5c70SMiroslav Lichvar * As the two skb clones share the hardware timestamp, which may be updated 678b50a5c70SMiroslav Lichvar * before the software timestamp is received, a hardware TX timestamp may be 679b50a5c70SMiroslav Lichvar * returned only if there is no software TX timestamp. Ignore false software 680b50a5c70SMiroslav Lichvar * timestamps, which may be made in the __sock_recv_timestamp() call when the 681b50a5c70SMiroslav Lichvar * option SO_TIMESTAMP(NS) is enabled on the socket, even when the skb has a 682b50a5c70SMiroslav Lichvar * hardware timestamp. 683b50a5c70SMiroslav Lichvar */ 684b50a5c70SMiroslav Lichvar static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp) 685b50a5c70SMiroslav Lichvar { 686b50a5c70SMiroslav Lichvar return skb->tstamp && !false_tstamp && skb_is_err_queue(skb); 687b50a5c70SMiroslav Lichvar } 688b50a5c70SMiroslav Lichvar 689aad9c8c4SMiroslav Lichvar static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb) 690aad9c8c4SMiroslav Lichvar { 691aad9c8c4SMiroslav Lichvar struct scm_ts_pktinfo ts_pktinfo; 692aad9c8c4SMiroslav Lichvar struct net_device *orig_dev; 693aad9c8c4SMiroslav Lichvar 694aad9c8c4SMiroslav Lichvar if (!skb_mac_header_was_set(skb)) 695aad9c8c4SMiroslav Lichvar return; 696aad9c8c4SMiroslav Lichvar 697aad9c8c4SMiroslav Lichvar memset(&ts_pktinfo, 0, sizeof(ts_pktinfo)); 698aad9c8c4SMiroslav Lichvar 699aad9c8c4SMiroslav Lichvar rcu_read_lock(); 700aad9c8c4SMiroslav Lichvar orig_dev = dev_get_by_napi_id(skb_napi_id(skb)); 701aad9c8c4SMiroslav Lichvar if (orig_dev) 702aad9c8c4SMiroslav Lichvar ts_pktinfo.if_index = orig_dev->ifindex; 703aad9c8c4SMiroslav Lichvar rcu_read_unlock(); 704aad9c8c4SMiroslav Lichvar 705aad9c8c4SMiroslav Lichvar ts_pktinfo.pkt_length = skb->len - skb_mac_offset(skb); 706aad9c8c4SMiroslav Lichvar put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO, 707aad9c8c4SMiroslav Lichvar sizeof(ts_pktinfo), &ts_pktinfo); 708aad9c8c4SMiroslav Lichvar } 709aad9c8c4SMiroslav Lichvar 71092f37fd2SEric Dumazet /* 71192f37fd2SEric Dumazet * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) 71292f37fd2SEric Dumazet */ 71392f37fd2SEric Dumazet void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, 71492f37fd2SEric Dumazet struct sk_buff *skb) 71592f37fd2SEric Dumazet { 71620d49473SPatrick Ohly int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP); 717f24b9be5SWillem de Bruijn struct scm_timestamping tss; 718b50a5c70SMiroslav Lichvar int empty = 1, false_tstamp = 0; 71920d49473SPatrick Ohly struct skb_shared_hwtstamps *shhwtstamps = 72020d49473SPatrick Ohly skb_hwtstamps(skb); 72192f37fd2SEric Dumazet 72220d49473SPatrick Ohly /* Race occurred between timestamp enabling and packet 72320d49473SPatrick Ohly receiving. Fill in the current time for now. */ 724b50a5c70SMiroslav Lichvar if (need_software_tstamp && skb->tstamp == 0) { 72520d49473SPatrick Ohly __net_timestamp(skb); 726b50a5c70SMiroslav Lichvar false_tstamp = 1; 727b50a5c70SMiroslav Lichvar } 72820d49473SPatrick Ohly 72920d49473SPatrick Ohly if (need_software_tstamp) { 73092f37fd2SEric Dumazet if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { 73192f37fd2SEric Dumazet struct timeval tv; 73220d49473SPatrick Ohly skb_get_timestamp(skb, &tv); 73320d49473SPatrick Ohly put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP, 73420d49473SPatrick Ohly sizeof(tv), &tv); 73592f37fd2SEric Dumazet } else { 736f24b9be5SWillem de Bruijn struct timespec ts; 737f24b9be5SWillem de Bruijn skb_get_timestampns(skb, &ts); 73820d49473SPatrick Ohly put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS, 739f24b9be5SWillem de Bruijn sizeof(ts), &ts); 74092f37fd2SEric Dumazet } 74192f37fd2SEric Dumazet } 74292f37fd2SEric Dumazet 743f24b9be5SWillem de Bruijn memset(&tss, 0, sizeof(tss)); 744c199105dSWillem de Bruijn if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) && 745f24b9be5SWillem de Bruijn ktime_to_timespec_cond(skb->tstamp, tss.ts + 0)) 74620d49473SPatrick Ohly empty = 0; 7474d276eb6SWillem de Bruijn if (shhwtstamps && 748b9f40e21SWillem de Bruijn (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) && 749b50a5c70SMiroslav Lichvar !skb_is_swtx_tstamp(skb, false_tstamp) && 750aad9c8c4SMiroslav Lichvar ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2)) { 75120d49473SPatrick Ohly empty = 0; 752aad9c8c4SMiroslav Lichvar if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) && 753aad9c8c4SMiroslav Lichvar !skb_is_err_queue(skb)) 754aad9c8c4SMiroslav Lichvar put_ts_pktinfo(msg, skb); 755aad9c8c4SMiroslav Lichvar } 7561c885808SFrancis Yan if (!empty) { 75720d49473SPatrick Ohly put_cmsg(msg, SOL_SOCKET, 758f24b9be5SWillem de Bruijn SCM_TIMESTAMPING, sizeof(tss), &tss); 7591c885808SFrancis Yan 7608605330aSSoheil Hassas Yeganeh if (skb_is_err_queue(skb) && skb->len && 7614ef1b286SSoheil Hassas Yeganeh SKB_EXT_ERR(skb)->opt_stats) 7621c885808SFrancis Yan put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS, 7631c885808SFrancis Yan skb->len, skb->data); 7641c885808SFrancis Yan } 76520d49473SPatrick Ohly } 7667c81fd8bSArnaldo Carvalho de Melo EXPORT_SYMBOL_GPL(__sock_recv_timestamp); 7677c81fd8bSArnaldo Carvalho de Melo 7686e3e939fSJohannes Berg void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, 7696e3e939fSJohannes Berg struct sk_buff *skb) 7706e3e939fSJohannes Berg { 7716e3e939fSJohannes Berg int ack; 7726e3e939fSJohannes Berg 7736e3e939fSJohannes Berg if (!sock_flag(sk, SOCK_WIFI_STATUS)) 7746e3e939fSJohannes Berg return; 7756e3e939fSJohannes Berg if (!skb->wifi_acked_valid) 7766e3e939fSJohannes Berg return; 7776e3e939fSJohannes Berg 7786e3e939fSJohannes Berg ack = skb->wifi_acked; 7796e3e939fSJohannes Berg 7806e3e939fSJohannes Berg put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack); 7816e3e939fSJohannes Berg } 7826e3e939fSJohannes Berg EXPORT_SYMBOL_GPL(__sock_recv_wifi_status); 7836e3e939fSJohannes Berg 78411165f14Sstephen hemminger static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, 78511165f14Sstephen hemminger struct sk_buff *skb) 7863b885787SNeil Horman { 787744d5a3eSEyal Birger if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount) 7883b885787SNeil Horman put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL, 789744d5a3eSEyal Birger sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount); 7903b885787SNeil Horman } 7913b885787SNeil Horman 792767dd033SEric Dumazet void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, 7933b885787SNeil Horman struct sk_buff *skb) 7943b885787SNeil Horman { 7953b885787SNeil Horman sock_recv_timestamp(msg, sk, skb); 7963b885787SNeil Horman sock_recv_drops(msg, sk, skb); 7973b885787SNeil Horman } 798767dd033SEric Dumazet EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops); 7993b885787SNeil Horman 8001b784140SYing Xue static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg, 8011b784140SYing Xue int flags) 802a2e27255SArnaldo Carvalho de Melo { 8032da62906SAl Viro return sock->ops->recvmsg(sock, msg, msg_data_left(msg), flags); 8042da62906SAl Viro } 805a2e27255SArnaldo Carvalho de Melo 8062da62906SAl Viro int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags) 8072da62906SAl Viro { 8082da62906SAl Viro int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags); 8092da62906SAl Viro 8102da62906SAl Viro return err ?: sock_recvmsg_nosec(sock, msg, flags); 8111da177e4SLinus Torvalds } 812c6d409cfSEric Dumazet EXPORT_SYMBOL(sock_recvmsg); 8131da177e4SLinus Torvalds 814c1249c0aSMartin Lucina /** 815c1249c0aSMartin Lucina * kernel_recvmsg - Receive a message from a socket (kernel space) 816c1249c0aSMartin Lucina * @sock: The socket to receive the message from 817c1249c0aSMartin Lucina * @msg: Received message 818c1249c0aSMartin Lucina * @vec: Input s/g array for message data 819c1249c0aSMartin Lucina * @num: Size of input s/g array 820c1249c0aSMartin Lucina * @size: Number of bytes to read 821c1249c0aSMartin Lucina * @flags: Message flags (MSG_DONTWAIT, etc...) 822c1249c0aSMartin Lucina * 823c1249c0aSMartin Lucina * On return the msg structure contains the scatter/gather array passed in the 824c1249c0aSMartin Lucina * vec argument. The array is modified so that it consists of the unfilled 825c1249c0aSMartin Lucina * portion of the original array. 826c1249c0aSMartin Lucina * 827c1249c0aSMartin Lucina * The returned value is the total number of bytes received, or an error. 828c1249c0aSMartin Lucina */ 8291da177e4SLinus Torvalds int kernel_recvmsg(struct socket *sock, struct msghdr *msg, 83089bddce5SStephen Hemminger struct kvec *vec, size_t num, size_t size, int flags) 8311da177e4SLinus Torvalds { 8321da177e4SLinus Torvalds mm_segment_t oldfs = get_fs(); 8331da177e4SLinus Torvalds int result; 8341da177e4SLinus Torvalds 8356aa24814SAl Viro iov_iter_kvec(&msg->msg_iter, READ | ITER_KVEC, vec, num, size); 8361da177e4SLinus Torvalds set_fs(KERNEL_DS); 8372da62906SAl Viro result = sock_recvmsg(sock, msg, flags); 8381da177e4SLinus Torvalds set_fs(oldfs); 8391da177e4SLinus Torvalds return result; 8401da177e4SLinus Torvalds } 841c6d409cfSEric Dumazet EXPORT_SYMBOL(kernel_recvmsg); 8421da177e4SLinus Torvalds 84320380731SArnaldo Carvalho de Melo static ssize_t sock_sendpage(struct file *file, struct page *page, 8441da177e4SLinus Torvalds int offset, size_t size, loff_t *ppos, int more) 8451da177e4SLinus Torvalds { 8461da177e4SLinus Torvalds struct socket *sock; 8471da177e4SLinus Torvalds int flags; 8481da177e4SLinus Torvalds 849b69aee04SEric Dumazet sock = file->private_data; 8501da177e4SLinus Torvalds 85135f9c09fSEric Dumazet flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; 85235f9c09fSEric Dumazet /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */ 85335f9c09fSEric Dumazet flags |= more; 8541da177e4SLinus Torvalds 855e6949583SLinus Torvalds return kernel_sendpage(sock, page, offset, size, flags); 8561da177e4SLinus Torvalds } 8571da177e4SLinus Torvalds 8589c55e01cSJens Axboe static ssize_t sock_splice_read(struct file *file, loff_t *ppos, 8599c55e01cSJens Axboe struct pipe_inode_info *pipe, size_t len, 8609c55e01cSJens Axboe unsigned int flags) 8619c55e01cSJens Axboe { 8629c55e01cSJens Axboe struct socket *sock = file->private_data; 8639c55e01cSJens Axboe 864997b37daSRémi Denis-Courmont if (unlikely(!sock->ops->splice_read)) 865997b37daSRémi Denis-Courmont return -EINVAL; 866997b37daSRémi Denis-Courmont 8679c55e01cSJens Axboe return sock->ops->splice_read(sock, ppos, pipe, len, flags); 8689c55e01cSJens Axboe } 8699c55e01cSJens Axboe 8708ae5e030SAl Viro static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to) 871ce1d4d3eSChristoph Hellwig { 8726d652330SAl Viro struct file *file = iocb->ki_filp; 8736d652330SAl Viro struct socket *sock = file->private_data; 8740345f931Stadeusz.struk@intel.com struct msghdr msg = {.msg_iter = *to, 8750345f931Stadeusz.struk@intel.com .msg_iocb = iocb}; 8768ae5e030SAl Viro ssize_t res; 877ce1d4d3eSChristoph Hellwig 8788ae5e030SAl Viro if (file->f_flags & O_NONBLOCK) 8798ae5e030SAl Viro msg.msg_flags = MSG_DONTWAIT; 8808ae5e030SAl Viro 8818ae5e030SAl Viro if (iocb->ki_pos != 0) 882ce1d4d3eSChristoph Hellwig return -ESPIPE; 883027445c3SBadari Pulavarty 88466ee59afSChristoph Hellwig if (!iov_iter_count(to)) /* Match SYS5 behaviour */ 885ce1d4d3eSChristoph Hellwig return 0; 886ce1d4d3eSChristoph Hellwig 8872da62906SAl Viro res = sock_recvmsg(sock, &msg, msg.msg_flags); 8888ae5e030SAl Viro *to = msg.msg_iter; 8898ae5e030SAl Viro return res; 890ce1d4d3eSChristoph Hellwig } 891ce1d4d3eSChristoph Hellwig 8928ae5e030SAl Viro static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from) 8931da177e4SLinus Torvalds { 8946d652330SAl Viro struct file *file = iocb->ki_filp; 8956d652330SAl Viro struct socket *sock = file->private_data; 8960345f931Stadeusz.struk@intel.com struct msghdr msg = {.msg_iter = *from, 8970345f931Stadeusz.struk@intel.com .msg_iocb = iocb}; 8988ae5e030SAl Viro ssize_t res; 8991da177e4SLinus Torvalds 9008ae5e030SAl Viro if (iocb->ki_pos != 0) 901ce1d4d3eSChristoph Hellwig return -ESPIPE; 902027445c3SBadari Pulavarty 9038ae5e030SAl Viro if (file->f_flags & O_NONBLOCK) 9048ae5e030SAl Viro msg.msg_flags = MSG_DONTWAIT; 9058ae5e030SAl Viro 9066d652330SAl Viro if (sock->type == SOCK_SEQPACKET) 9076d652330SAl Viro msg.msg_flags |= MSG_EOR; 9086d652330SAl Viro 909d8725c86SAl Viro res = sock_sendmsg(sock, &msg); 9108ae5e030SAl Viro *from = msg.msg_iter; 9118ae5e030SAl Viro return res; 9121da177e4SLinus Torvalds } 9131da177e4SLinus Torvalds 9141da177e4SLinus Torvalds /* 9151da177e4SLinus Torvalds * Atomic setting of ioctl hooks to avoid race 9161da177e4SLinus Torvalds * with module unload. 9171da177e4SLinus Torvalds */ 9181da177e4SLinus Torvalds 9194a3e2f71SArjan van de Ven static DEFINE_MUTEX(br_ioctl_mutex); 920c6d409cfSEric Dumazet static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg); 9211da177e4SLinus Torvalds 922881d966bSEric W. Biederman void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *)) 9231da177e4SLinus Torvalds { 9244a3e2f71SArjan van de Ven mutex_lock(&br_ioctl_mutex); 9251da177e4SLinus Torvalds br_ioctl_hook = hook; 9264a3e2f71SArjan van de Ven mutex_unlock(&br_ioctl_mutex); 9271da177e4SLinus Torvalds } 9281da177e4SLinus Torvalds EXPORT_SYMBOL(brioctl_set); 9291da177e4SLinus Torvalds 9304a3e2f71SArjan van de Ven static DEFINE_MUTEX(vlan_ioctl_mutex); 931881d966bSEric W. Biederman static int (*vlan_ioctl_hook) (struct net *, void __user *arg); 9321da177e4SLinus Torvalds 933881d966bSEric W. Biederman void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) 9341da177e4SLinus Torvalds { 9354a3e2f71SArjan van de Ven mutex_lock(&vlan_ioctl_mutex); 9361da177e4SLinus Torvalds vlan_ioctl_hook = hook; 9374a3e2f71SArjan van de Ven mutex_unlock(&vlan_ioctl_mutex); 9381da177e4SLinus Torvalds } 9391da177e4SLinus Torvalds EXPORT_SYMBOL(vlan_ioctl_set); 9401da177e4SLinus Torvalds 9414a3e2f71SArjan van de Ven static DEFINE_MUTEX(dlci_ioctl_mutex); 9421da177e4SLinus Torvalds static int (*dlci_ioctl_hook) (unsigned int, void __user *); 9431da177e4SLinus Torvalds 9441da177e4SLinus Torvalds void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) 9451da177e4SLinus Torvalds { 9464a3e2f71SArjan van de Ven mutex_lock(&dlci_ioctl_mutex); 9471da177e4SLinus Torvalds dlci_ioctl_hook = hook; 9484a3e2f71SArjan van de Ven mutex_unlock(&dlci_ioctl_mutex); 9491da177e4SLinus Torvalds } 9501da177e4SLinus Torvalds EXPORT_SYMBOL(dlci_ioctl_set); 9511da177e4SLinus Torvalds 9526b96018bSArnd Bergmann static long sock_do_ioctl(struct net *net, struct socket *sock, 9536b96018bSArnd Bergmann unsigned int cmd, unsigned long arg) 9546b96018bSArnd Bergmann { 9556b96018bSArnd Bergmann int err; 9566b96018bSArnd Bergmann void __user *argp = (void __user *)arg; 9576b96018bSArnd Bergmann 9586b96018bSArnd Bergmann err = sock->ops->ioctl(sock, cmd, arg); 9596b96018bSArnd Bergmann 9606b96018bSArnd Bergmann /* 9616b96018bSArnd Bergmann * If this ioctl is unknown try to hand it down 9626b96018bSArnd Bergmann * to the NIC driver. 9636b96018bSArnd Bergmann */ 96436fd633eSAl Viro if (err != -ENOIOCTLCMD) 9656b96018bSArnd Bergmann return err; 9666b96018bSArnd Bergmann 96736fd633eSAl Viro if (cmd == SIOCGIFCONF) { 96836fd633eSAl Viro struct ifconf ifc; 96936fd633eSAl Viro if (copy_from_user(&ifc, argp, sizeof(struct ifconf))) 97036fd633eSAl Viro return -EFAULT; 97136fd633eSAl Viro rtnl_lock(); 97236fd633eSAl Viro err = dev_ifconf(net, &ifc, sizeof(struct ifreq)); 97336fd633eSAl Viro rtnl_unlock(); 97436fd633eSAl Viro if (!err && copy_to_user(argp, &ifc, sizeof(struct ifconf))) 97536fd633eSAl Viro err = -EFAULT; 97644c02a2cSAl Viro } else { 97744c02a2cSAl Viro struct ifreq ifr; 97844c02a2cSAl Viro bool need_copyout; 97944c02a2cSAl Viro if (copy_from_user(&ifr, argp, sizeof(struct ifreq))) 98044c02a2cSAl Viro return -EFAULT; 98144c02a2cSAl Viro err = dev_ioctl(net, cmd, &ifr, &need_copyout); 98244c02a2cSAl Viro if (!err && need_copyout) 98344c02a2cSAl Viro if (copy_to_user(argp, &ifr, sizeof(struct ifreq))) 98444c02a2cSAl Viro return -EFAULT; 98536fd633eSAl Viro } 9866b96018bSArnd Bergmann return err; 9876b96018bSArnd Bergmann } 9886b96018bSArnd Bergmann 9891da177e4SLinus Torvalds /* 9901da177e4SLinus Torvalds * With an ioctl, arg may well be a user mode pointer, but we don't know 9911da177e4SLinus Torvalds * what to do with it - that's up to the protocol still. 9921da177e4SLinus Torvalds */ 9931da177e4SLinus Torvalds 994c62cce2cSAndrey Vagin static struct ns_common *get_net_ns(struct ns_common *ns) 995c62cce2cSAndrey Vagin { 996c62cce2cSAndrey Vagin return &get_net(container_of(ns, struct net, ns))->ns; 997c62cce2cSAndrey Vagin } 998c62cce2cSAndrey Vagin 9991da177e4SLinus Torvalds static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) 10001da177e4SLinus Torvalds { 10011da177e4SLinus Torvalds struct socket *sock; 1002881d966bSEric W. Biederman struct sock *sk; 10031da177e4SLinus Torvalds void __user *argp = (void __user *)arg; 10041da177e4SLinus Torvalds int pid, err; 1005881d966bSEric W. Biederman struct net *net; 10061da177e4SLinus Torvalds 1007b69aee04SEric Dumazet sock = file->private_data; 1008881d966bSEric W. Biederman sk = sock->sk; 10093b1e0a65SYOSHIFUJI Hideaki net = sock_net(sk); 101044c02a2cSAl Viro if (unlikely(cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))) { 101144c02a2cSAl Viro struct ifreq ifr; 101244c02a2cSAl Viro bool need_copyout; 101344c02a2cSAl Viro if (copy_from_user(&ifr, argp, sizeof(struct ifreq))) 101444c02a2cSAl Viro return -EFAULT; 101544c02a2cSAl Viro err = dev_ioctl(net, cmd, &ifr, &need_copyout); 101644c02a2cSAl Viro if (!err && need_copyout) 101744c02a2cSAl Viro if (copy_to_user(argp, &ifr, sizeof(struct ifreq))) 101844c02a2cSAl Viro return -EFAULT; 10191da177e4SLinus Torvalds } else 10203d23e349SJohannes Berg #ifdef CONFIG_WEXT_CORE 10211da177e4SLinus Torvalds if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { 1022b1b0c245SAl Viro err = wext_handle_ioctl(net, cmd, argp); 10231da177e4SLinus Torvalds } else 10243d23e349SJohannes Berg #endif 10251da177e4SLinus Torvalds switch (cmd) { 10261da177e4SLinus Torvalds case FIOSETOWN: 10271da177e4SLinus Torvalds case SIOCSPGRP: 10281da177e4SLinus Torvalds err = -EFAULT; 10291da177e4SLinus Torvalds if (get_user(pid, (int __user *)argp)) 10301da177e4SLinus Torvalds break; 1031393cc3f5SJiri Slaby err = f_setown(sock->file, pid, 1); 10321da177e4SLinus Torvalds break; 10331da177e4SLinus Torvalds case FIOGETOWN: 10341da177e4SLinus Torvalds case SIOCGPGRP: 1035609d7fa9SEric W. Biederman err = put_user(f_getown(sock->file), 103689bddce5SStephen Hemminger (int __user *)argp); 10371da177e4SLinus Torvalds break; 10381da177e4SLinus Torvalds case SIOCGIFBR: 10391da177e4SLinus Torvalds case SIOCSIFBR: 10401da177e4SLinus Torvalds case SIOCBRADDBR: 10411da177e4SLinus Torvalds case SIOCBRDELBR: 10421da177e4SLinus Torvalds err = -ENOPKG; 10431da177e4SLinus Torvalds if (!br_ioctl_hook) 10441da177e4SLinus Torvalds request_module("bridge"); 10451da177e4SLinus Torvalds 10464a3e2f71SArjan van de Ven mutex_lock(&br_ioctl_mutex); 10471da177e4SLinus Torvalds if (br_ioctl_hook) 1048881d966bSEric W. Biederman err = br_ioctl_hook(net, cmd, argp); 10494a3e2f71SArjan van de Ven mutex_unlock(&br_ioctl_mutex); 10501da177e4SLinus Torvalds break; 10511da177e4SLinus Torvalds case SIOCGIFVLAN: 10521da177e4SLinus Torvalds case SIOCSIFVLAN: 10531da177e4SLinus Torvalds err = -ENOPKG; 10541da177e4SLinus Torvalds if (!vlan_ioctl_hook) 10551da177e4SLinus Torvalds request_module("8021q"); 10561da177e4SLinus Torvalds 10574a3e2f71SArjan van de Ven mutex_lock(&vlan_ioctl_mutex); 10581da177e4SLinus Torvalds if (vlan_ioctl_hook) 1059881d966bSEric W. Biederman err = vlan_ioctl_hook(net, argp); 10604a3e2f71SArjan van de Ven mutex_unlock(&vlan_ioctl_mutex); 10611da177e4SLinus Torvalds break; 10621da177e4SLinus Torvalds case SIOCADDDLCI: 10631da177e4SLinus Torvalds case SIOCDELDLCI: 10641da177e4SLinus Torvalds err = -ENOPKG; 10651da177e4SLinus Torvalds if (!dlci_ioctl_hook) 10661da177e4SLinus Torvalds request_module("dlci"); 10671da177e4SLinus Torvalds 10684a3e2f71SArjan van de Ven mutex_lock(&dlci_ioctl_mutex); 10697512cbf6SPavel Emelyanov if (dlci_ioctl_hook) 10701da177e4SLinus Torvalds err = dlci_ioctl_hook(cmd, argp); 10714a3e2f71SArjan van de Ven mutex_unlock(&dlci_ioctl_mutex); 10721da177e4SLinus Torvalds break; 1073c62cce2cSAndrey Vagin case SIOCGSKNS: 1074c62cce2cSAndrey Vagin err = -EPERM; 1075c62cce2cSAndrey Vagin if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1076c62cce2cSAndrey Vagin break; 1077c62cce2cSAndrey Vagin 1078c62cce2cSAndrey Vagin err = open_related_ns(&net->ns, get_net_ns); 1079c62cce2cSAndrey Vagin break; 10801da177e4SLinus Torvalds default: 10816b96018bSArnd Bergmann err = sock_do_ioctl(net, sock, cmd, arg); 10821da177e4SLinus Torvalds break; 10831da177e4SLinus Torvalds } 10841da177e4SLinus Torvalds return err; 10851da177e4SLinus Torvalds } 10861da177e4SLinus Torvalds 10871da177e4SLinus Torvalds int sock_create_lite(int family, int type, int protocol, struct socket **res) 10881da177e4SLinus Torvalds { 10891da177e4SLinus Torvalds int err; 10901da177e4SLinus Torvalds struct socket *sock = NULL; 10911da177e4SLinus Torvalds 10921da177e4SLinus Torvalds err = security_socket_create(family, type, protocol, 1); 10931da177e4SLinus Torvalds if (err) 10941da177e4SLinus Torvalds goto out; 10951da177e4SLinus Torvalds 10961da177e4SLinus Torvalds sock = sock_alloc(); 10971da177e4SLinus Torvalds if (!sock) { 10981da177e4SLinus Torvalds err = -ENOMEM; 10991da177e4SLinus Torvalds goto out; 11001da177e4SLinus Torvalds } 11011da177e4SLinus Torvalds 11021da177e4SLinus Torvalds sock->type = type; 11037420ed23SVenkat Yekkirala err = security_socket_post_create(sock, family, type, protocol, 1); 11047420ed23SVenkat Yekkirala if (err) 11057420ed23SVenkat Yekkirala goto out_release; 11067420ed23SVenkat Yekkirala 11071da177e4SLinus Torvalds out: 11081da177e4SLinus Torvalds *res = sock; 11091da177e4SLinus Torvalds return err; 11107420ed23SVenkat Yekkirala out_release: 11117420ed23SVenkat Yekkirala sock_release(sock); 11127420ed23SVenkat Yekkirala sock = NULL; 11137420ed23SVenkat Yekkirala goto out; 11141da177e4SLinus Torvalds } 1115c6d409cfSEric Dumazet EXPORT_SYMBOL(sock_create_lite); 11161da177e4SLinus Torvalds 11171da177e4SLinus Torvalds /* No kernel lock held - perfect */ 1118ade994f4SAl Viro static __poll_t sock_poll(struct file *file, poll_table *wait) 11191da177e4SLinus Torvalds { 1120e6c8adcaSAl Viro __poll_t busy_flag = 0; 11211da177e4SLinus Torvalds struct socket *sock; 11221da177e4SLinus Torvalds 11231da177e4SLinus Torvalds /* 11241da177e4SLinus Torvalds * We can't return errors to poll, so it's either yes or no. 11251da177e4SLinus Torvalds */ 1126b69aee04SEric Dumazet sock = file->private_data; 11272d48d67fSEliezer Tamir 1128cbf55001SEliezer Tamir if (sk_can_busy_loop(sock->sk)) { 11292d48d67fSEliezer Tamir /* this socket can poll_ll so tell the system call */ 1130cbf55001SEliezer Tamir busy_flag = POLL_BUSY_LOOP; 11312d48d67fSEliezer Tamir 11322d48d67fSEliezer Tamir /* once, only if requested by syscall */ 1133cbf55001SEliezer Tamir if (wait && (wait->_key & POLL_BUSY_LOOP)) 1134cbf55001SEliezer Tamir sk_busy_loop(sock->sk, 1); 11352d48d67fSEliezer Tamir } 11362d48d67fSEliezer Tamir 1137cbf55001SEliezer Tamir return busy_flag | sock->ops->poll(file, sock, wait); 11381da177e4SLinus Torvalds } 11391da177e4SLinus Torvalds 11401da177e4SLinus Torvalds static int sock_mmap(struct file *file, struct vm_area_struct *vma) 11411da177e4SLinus Torvalds { 1142b69aee04SEric Dumazet struct socket *sock = file->private_data; 11431da177e4SLinus Torvalds 11441da177e4SLinus Torvalds return sock->ops->mmap(file, sock, vma); 11451da177e4SLinus Torvalds } 11461da177e4SLinus Torvalds 114720380731SArnaldo Carvalho de Melo static int sock_close(struct inode *inode, struct file *filp) 11481da177e4SLinus Torvalds { 11491da177e4SLinus Torvalds sock_release(SOCKET_I(inode)); 11501da177e4SLinus Torvalds return 0; 11511da177e4SLinus Torvalds } 11521da177e4SLinus Torvalds 11531da177e4SLinus Torvalds /* 11541da177e4SLinus Torvalds * Update the socket async list 11551da177e4SLinus Torvalds * 11561da177e4SLinus Torvalds * Fasync_list locking strategy. 11571da177e4SLinus Torvalds * 11581da177e4SLinus Torvalds * 1. fasync_list is modified only under process context socket lock 11591da177e4SLinus Torvalds * i.e. under semaphore. 11601da177e4SLinus Torvalds * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) 1161989a2979SEric Dumazet * or under socket lock 11621da177e4SLinus Torvalds */ 11631da177e4SLinus Torvalds 11641da177e4SLinus Torvalds static int sock_fasync(int fd, struct file *filp, int on) 11651da177e4SLinus Torvalds { 1166989a2979SEric Dumazet struct socket *sock = filp->private_data; 1167989a2979SEric Dumazet struct sock *sk = sock->sk; 1168eaefd110SEric Dumazet struct socket_wq *wq; 11691da177e4SLinus Torvalds 1170989a2979SEric Dumazet if (sk == NULL) 11711da177e4SLinus Torvalds return -EINVAL; 11721da177e4SLinus Torvalds 11731da177e4SLinus Torvalds lock_sock(sk); 11741e1d04e6SHannes Frederic Sowa wq = rcu_dereference_protected(sock->wq, lockdep_sock_is_held(sk)); 1175eaefd110SEric Dumazet fasync_helper(fd, filp, on, &wq->fasync_list); 11761da177e4SLinus Torvalds 1177eaefd110SEric Dumazet if (!wq->fasync_list) 1178bcdce719SEric Dumazet sock_reset_flag(sk, SOCK_FASYNC); 1179989a2979SEric Dumazet else 1180989a2979SEric Dumazet sock_set_flag(sk, SOCK_FASYNC); 11811da177e4SLinus Torvalds 1182989a2979SEric Dumazet release_sock(sk); 11831da177e4SLinus Torvalds return 0; 11841da177e4SLinus Torvalds } 11851da177e4SLinus Torvalds 1186ceb5d58bSEric Dumazet /* This function may be called only under rcu_lock */ 11871da177e4SLinus Torvalds 1188ceb5d58bSEric Dumazet int sock_wake_async(struct socket_wq *wq, int how, int band) 11891da177e4SLinus Torvalds { 1190ceb5d58bSEric Dumazet if (!wq || !wq->fasync_list) 1191ceb5d58bSEric Dumazet return -1; 119243815482SEric Dumazet 119389bddce5SStephen Hemminger switch (how) { 11948d8ad9d7SPavel Emelyanov case SOCK_WAKE_WAITD: 1195ceb5d58bSEric Dumazet if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags)) 11961da177e4SLinus Torvalds break; 11971da177e4SLinus Torvalds goto call_kill; 11988d8ad9d7SPavel Emelyanov case SOCK_WAKE_SPACE: 1199ceb5d58bSEric Dumazet if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags)) 12001da177e4SLinus Torvalds break; 12011da177e4SLinus Torvalds /* fall through */ 12028d8ad9d7SPavel Emelyanov case SOCK_WAKE_IO: 12031da177e4SLinus Torvalds call_kill: 120443815482SEric Dumazet kill_fasync(&wq->fasync_list, SIGIO, band); 12051da177e4SLinus Torvalds break; 12068d8ad9d7SPavel Emelyanov case SOCK_WAKE_URG: 120743815482SEric Dumazet kill_fasync(&wq->fasync_list, SIGURG, band); 12081da177e4SLinus Torvalds } 1209ceb5d58bSEric Dumazet 12101da177e4SLinus Torvalds return 0; 12111da177e4SLinus Torvalds } 1212c6d409cfSEric Dumazet EXPORT_SYMBOL(sock_wake_async); 12131da177e4SLinus Torvalds 1214721db93aSPavel Emelyanov int __sock_create(struct net *net, int family, int type, int protocol, 121589bddce5SStephen Hemminger struct socket **res, int kern) 12161da177e4SLinus Torvalds { 12171da177e4SLinus Torvalds int err; 12181da177e4SLinus Torvalds struct socket *sock; 121955737fdaSStephen Hemminger const struct net_proto_family *pf; 12201da177e4SLinus Torvalds 12211da177e4SLinus Torvalds /* 12221da177e4SLinus Torvalds * Check protocol is in range 12231da177e4SLinus Torvalds */ 12241da177e4SLinus Torvalds if (family < 0 || family >= NPROTO) 12251da177e4SLinus Torvalds return -EAFNOSUPPORT; 12261da177e4SLinus Torvalds if (type < 0 || type >= SOCK_MAX) 12271da177e4SLinus Torvalds return -EINVAL; 12281da177e4SLinus Torvalds 12291da177e4SLinus Torvalds /* Compatibility. 12301da177e4SLinus Torvalds 12311da177e4SLinus Torvalds This uglymoron is moved from INET layer to here to avoid 12321da177e4SLinus Torvalds deadlock in module load. 12331da177e4SLinus Torvalds */ 12341da177e4SLinus Torvalds if (family == PF_INET && type == SOCK_PACKET) { 1235f3c98690Sliping.zhang pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n", 123689bddce5SStephen Hemminger current->comm); 12371da177e4SLinus Torvalds family = PF_PACKET; 12381da177e4SLinus Torvalds } 12391da177e4SLinus Torvalds 12401da177e4SLinus Torvalds err = security_socket_create(family, type, protocol, kern); 12411da177e4SLinus Torvalds if (err) 12421da177e4SLinus Torvalds return err; 12431da177e4SLinus Torvalds 124455737fdaSStephen Hemminger /* 124555737fdaSStephen Hemminger * Allocate the socket and allow the family to set things up. if 124655737fdaSStephen Hemminger * the protocol is 0, the family is instructed to select an appropriate 124755737fdaSStephen Hemminger * default. 124855737fdaSStephen Hemminger */ 124955737fdaSStephen Hemminger sock = sock_alloc(); 125055737fdaSStephen Hemminger if (!sock) { 1251e87cc472SJoe Perches net_warn_ratelimited("socket: no more sockets\n"); 125255737fdaSStephen Hemminger return -ENFILE; /* Not exactly a match, but its the 125355737fdaSStephen Hemminger closest posix thing */ 125455737fdaSStephen Hemminger } 125555737fdaSStephen Hemminger 125655737fdaSStephen Hemminger sock->type = type; 125755737fdaSStephen Hemminger 125895a5afcaSJohannes Berg #ifdef CONFIG_MODULES 12591da177e4SLinus Torvalds /* Attempt to load a protocol module if the find failed. 12601da177e4SLinus Torvalds * 12611da177e4SLinus Torvalds * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user 12621da177e4SLinus Torvalds * requested real, full-featured networking support upon configuration. 12631da177e4SLinus Torvalds * Otherwise module support will break! 12641da177e4SLinus Torvalds */ 1265190683a9SEric Dumazet if (rcu_access_pointer(net_families[family]) == NULL) 12661da177e4SLinus Torvalds request_module("net-pf-%d", family); 12671da177e4SLinus Torvalds #endif 12681da177e4SLinus Torvalds 126955737fdaSStephen Hemminger rcu_read_lock(); 127055737fdaSStephen Hemminger pf = rcu_dereference(net_families[family]); 12711da177e4SLinus Torvalds err = -EAFNOSUPPORT; 127255737fdaSStephen Hemminger if (!pf) 127355737fdaSStephen Hemminger goto out_release; 12741da177e4SLinus Torvalds 12751da177e4SLinus Torvalds /* 12761da177e4SLinus Torvalds * We will call the ->create function, that possibly is in a loadable 12771da177e4SLinus Torvalds * module, so we have to bump that loadable module refcnt first. 12781da177e4SLinus Torvalds */ 127955737fdaSStephen Hemminger if (!try_module_get(pf->owner)) 12801da177e4SLinus Torvalds goto out_release; 12811da177e4SLinus Torvalds 128255737fdaSStephen Hemminger /* Now protected by module ref count */ 128355737fdaSStephen Hemminger rcu_read_unlock(); 128455737fdaSStephen Hemminger 12853f378b68SEric Paris err = pf->create(net, sock, protocol, kern); 128655737fdaSStephen Hemminger if (err < 0) 12871da177e4SLinus Torvalds goto out_module_put; 1288a79af59eSFrank Filz 12891da177e4SLinus Torvalds /* 12901da177e4SLinus Torvalds * Now to bump the refcnt of the [loadable] module that owns this 12911da177e4SLinus Torvalds * socket at sock_release time we decrement its refcnt. 12921da177e4SLinus Torvalds */ 129355737fdaSStephen Hemminger if (!try_module_get(sock->ops->owner)) 129455737fdaSStephen Hemminger goto out_module_busy; 129555737fdaSStephen Hemminger 12961da177e4SLinus Torvalds /* 12971da177e4SLinus Torvalds * Now that we're done with the ->create function, the [loadable] 12981da177e4SLinus Torvalds * module can have its refcnt decremented 12991da177e4SLinus Torvalds */ 130055737fdaSStephen Hemminger module_put(pf->owner); 13017420ed23SVenkat Yekkirala err = security_socket_post_create(sock, family, type, protocol, kern); 13027420ed23SVenkat Yekkirala if (err) 13033b185525SHerbert Xu goto out_sock_release; 130455737fdaSStephen Hemminger *res = sock; 13051da177e4SLinus Torvalds 130655737fdaSStephen Hemminger return 0; 130755737fdaSStephen Hemminger 130855737fdaSStephen Hemminger out_module_busy: 130955737fdaSStephen Hemminger err = -EAFNOSUPPORT; 13101da177e4SLinus Torvalds out_module_put: 131155737fdaSStephen Hemminger sock->ops = NULL; 131255737fdaSStephen Hemminger module_put(pf->owner); 131355737fdaSStephen Hemminger out_sock_release: 13141da177e4SLinus Torvalds sock_release(sock); 131555737fdaSStephen Hemminger return err; 131655737fdaSStephen Hemminger 131755737fdaSStephen Hemminger out_release: 131855737fdaSStephen Hemminger rcu_read_unlock(); 131955737fdaSStephen Hemminger goto out_sock_release; 13201da177e4SLinus Torvalds } 1321721db93aSPavel Emelyanov EXPORT_SYMBOL(__sock_create); 13221da177e4SLinus Torvalds 13231da177e4SLinus Torvalds int sock_create(int family, int type, int protocol, struct socket **res) 13241da177e4SLinus Torvalds { 13251b8d7ae4SEric W. Biederman return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); 13261da177e4SLinus Torvalds } 1327c6d409cfSEric Dumazet EXPORT_SYMBOL(sock_create); 13281da177e4SLinus Torvalds 1329eeb1bd5cSEric W. Biederman int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res) 13301da177e4SLinus Torvalds { 1331eeb1bd5cSEric W. Biederman return __sock_create(net, family, type, protocol, res, 1); 13321da177e4SLinus Torvalds } 1333c6d409cfSEric Dumazet EXPORT_SYMBOL(sock_create_kern); 13341da177e4SLinus Torvalds 13359d6a15c3SDominik Brodowski int __sys_socket(int family, int type, int protocol) 13361da177e4SLinus Torvalds { 13371da177e4SLinus Torvalds int retval; 13381da177e4SLinus Torvalds struct socket *sock; 1339a677a039SUlrich Drepper int flags; 1340a677a039SUlrich Drepper 1341e38b36f3SUlrich Drepper /* Check the SOCK_* constants for consistency. */ 1342e38b36f3SUlrich Drepper BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC); 1343e38b36f3SUlrich Drepper BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK); 1344e38b36f3SUlrich Drepper BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK); 1345e38b36f3SUlrich Drepper BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK); 1346e38b36f3SUlrich Drepper 1347a677a039SUlrich Drepper flags = type & ~SOCK_TYPE_MASK; 134877d27200SUlrich Drepper if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1349a677a039SUlrich Drepper return -EINVAL; 1350a677a039SUlrich Drepper type &= SOCK_TYPE_MASK; 13511da177e4SLinus Torvalds 1352aaca0bdcSUlrich Drepper if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1353aaca0bdcSUlrich Drepper flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1354aaca0bdcSUlrich Drepper 13551da177e4SLinus Torvalds retval = sock_create(family, type, protocol, &sock); 13561da177e4SLinus Torvalds if (retval < 0) 13571da177e4SLinus Torvalds return retval; 13581da177e4SLinus Torvalds 13598e1611e2SAl Viro return sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK)); 13601da177e4SLinus Torvalds } 13611da177e4SLinus Torvalds 13629d6a15c3SDominik Brodowski SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol) 13639d6a15c3SDominik Brodowski { 13649d6a15c3SDominik Brodowski return __sys_socket(family, type, protocol); 13659d6a15c3SDominik Brodowski } 13669d6a15c3SDominik Brodowski 13671da177e4SLinus Torvalds /* 13681da177e4SLinus Torvalds * Create a pair of connected sockets. 13691da177e4SLinus Torvalds */ 13701da177e4SLinus Torvalds 13713e0fa65fSHeiko Carstens SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol, 13723e0fa65fSHeiko Carstens int __user *, usockvec) 13731da177e4SLinus Torvalds { 13741da177e4SLinus Torvalds struct socket *sock1, *sock2; 13751da177e4SLinus Torvalds int fd1, fd2, err; 1376db349509SAl Viro struct file *newfile1, *newfile2; 1377a677a039SUlrich Drepper int flags; 1378a677a039SUlrich Drepper 1379a677a039SUlrich Drepper flags = type & ~SOCK_TYPE_MASK; 138077d27200SUlrich Drepper if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1381a677a039SUlrich Drepper return -EINVAL; 1382a677a039SUlrich Drepper type &= SOCK_TYPE_MASK; 13831da177e4SLinus Torvalds 1384aaca0bdcSUlrich Drepper if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1385aaca0bdcSUlrich Drepper flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1386aaca0bdcSUlrich Drepper 13871da177e4SLinus Torvalds /* 1388016a266bSAl Viro * reserve descriptors and make sure we won't fail 1389016a266bSAl Viro * to return them to userland. 1390016a266bSAl Viro */ 1391016a266bSAl Viro fd1 = get_unused_fd_flags(flags); 1392016a266bSAl Viro if (unlikely(fd1 < 0)) 1393016a266bSAl Viro return fd1; 1394016a266bSAl Viro 1395016a266bSAl Viro fd2 = get_unused_fd_flags(flags); 1396016a266bSAl Viro if (unlikely(fd2 < 0)) { 1397016a266bSAl Viro put_unused_fd(fd1); 1398016a266bSAl Viro return fd2; 1399016a266bSAl Viro } 1400016a266bSAl Viro 1401016a266bSAl Viro err = put_user(fd1, &usockvec[0]); 1402016a266bSAl Viro if (err) 1403016a266bSAl Viro goto out; 1404016a266bSAl Viro 1405016a266bSAl Viro err = put_user(fd2, &usockvec[1]); 1406016a266bSAl Viro if (err) 1407016a266bSAl Viro goto out; 1408016a266bSAl Viro 1409016a266bSAl Viro /* 14101da177e4SLinus Torvalds * Obtain the first socket and check if the underlying protocol 14111da177e4SLinus Torvalds * supports the socketpair call. 14121da177e4SLinus Torvalds */ 14131da177e4SLinus Torvalds 14141da177e4SLinus Torvalds err = sock_create(family, type, protocol, &sock1); 1415016a266bSAl Viro if (unlikely(err < 0)) 14161da177e4SLinus Torvalds goto out; 14171da177e4SLinus Torvalds 14181da177e4SLinus Torvalds err = sock_create(family, type, protocol, &sock2); 1419016a266bSAl Viro if (unlikely(err < 0)) { 1420016a266bSAl Viro sock_release(sock1); 1421016a266bSAl Viro goto out; 1422bf3c23d1SDavid S. Miller } 1423d73aa286SYann Droneaud 1424016a266bSAl Viro err = sock1->ops->socketpair(sock1, sock2); 1425016a266bSAl Viro if (unlikely(err < 0)) { 1426016a266bSAl Viro sock_release(sock2); 1427016a266bSAl Viro sock_release(sock1); 1428016a266bSAl Viro goto out; 142928407630SAl Viro } 143028407630SAl Viro 1431aab174f0SLinus Torvalds newfile1 = sock_alloc_file(sock1, flags, NULL); 1432b5ffe634SViresh Kumar if (IS_ERR(newfile1)) { 143328407630SAl Viro err = PTR_ERR(newfile1); 1434016a266bSAl Viro sock_release(sock2); 1435016a266bSAl Viro goto out; 143628407630SAl Viro } 143728407630SAl Viro 1438aab174f0SLinus Torvalds newfile2 = sock_alloc_file(sock2, flags, NULL); 143928407630SAl Viro if (IS_ERR(newfile2)) { 144028407630SAl Viro err = PTR_ERR(newfile2); 1441016a266bSAl Viro fput(newfile1); 1442016a266bSAl Viro goto out; 1443db349509SAl Viro } 1444db349509SAl Viro 1445157cf649SAl Viro audit_fd_pair(fd1, fd2); 1446d73aa286SYann Droneaud 1447db349509SAl Viro fd_install(fd1, newfile1); 1448db349509SAl Viro fd_install(fd2, newfile2); 14491da177e4SLinus Torvalds return 0; 14501da177e4SLinus Torvalds 14511da177e4SLinus Torvalds out: 1452016a266bSAl Viro put_unused_fd(fd2); 1453016a266bSAl Viro put_unused_fd(fd1); 14541da177e4SLinus Torvalds return err; 14551da177e4SLinus Torvalds } 14561da177e4SLinus Torvalds 14571da177e4SLinus Torvalds /* 14581da177e4SLinus Torvalds * Bind a name to a socket. Nothing much to do here since it's 14591da177e4SLinus Torvalds * the protocol's responsibility to handle the local address. 14601da177e4SLinus Torvalds * 14611da177e4SLinus Torvalds * We move the socket address to kernel space before we call 14621da177e4SLinus Torvalds * the protocol layer (having also checked the address is ok). 14631da177e4SLinus Torvalds */ 14641da177e4SLinus Torvalds 1465a87d35d8SDominik Brodowski int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) 14661da177e4SLinus Torvalds { 14671da177e4SLinus Torvalds struct socket *sock; 1468230b1839SYOSHIFUJI Hideaki struct sockaddr_storage address; 14696cb153caSBenjamin LaHaise int err, fput_needed; 14701da177e4SLinus Torvalds 147189bddce5SStephen Hemminger sock = sockfd_lookup_light(fd, &err, &fput_needed); 147289bddce5SStephen Hemminger if (sock) { 147343db362dSMaciej Żenczykowski err = move_addr_to_kernel(umyaddr, addrlen, &address); 147489bddce5SStephen Hemminger if (err >= 0) { 147589bddce5SStephen Hemminger err = security_socket_bind(sock, 1476230b1839SYOSHIFUJI Hideaki (struct sockaddr *)&address, 147789bddce5SStephen Hemminger addrlen); 14786cb153caSBenjamin LaHaise if (!err) 14796cb153caSBenjamin LaHaise err = sock->ops->bind(sock, 148089bddce5SStephen Hemminger (struct sockaddr *) 1481230b1839SYOSHIFUJI Hideaki &address, addrlen); 14821da177e4SLinus Torvalds } 14836cb153caSBenjamin LaHaise fput_light(sock->file, fput_needed); 14841da177e4SLinus Torvalds } 14851da177e4SLinus Torvalds return err; 14861da177e4SLinus Torvalds } 14871da177e4SLinus Torvalds 1488a87d35d8SDominik Brodowski SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) 1489a87d35d8SDominik Brodowski { 1490a87d35d8SDominik Brodowski return __sys_bind(fd, umyaddr, addrlen); 1491a87d35d8SDominik Brodowski } 1492a87d35d8SDominik Brodowski 14931da177e4SLinus Torvalds /* 14941da177e4SLinus Torvalds * Perform a listen. Basically, we allow the protocol to do anything 14951da177e4SLinus Torvalds * necessary for a listen, and if that works, we mark the socket as 14961da177e4SLinus Torvalds * ready for listening. 14971da177e4SLinus Torvalds */ 14981da177e4SLinus Torvalds 14993e0fa65fSHeiko Carstens SYSCALL_DEFINE2(listen, int, fd, int, backlog) 15001da177e4SLinus Torvalds { 15011da177e4SLinus Torvalds struct socket *sock; 15026cb153caSBenjamin LaHaise int err, fput_needed; 1503b8e1f9b5SPavel Emelyanov int somaxconn; 15041da177e4SLinus Torvalds 150589bddce5SStephen Hemminger sock = sockfd_lookup_light(fd, &err, &fput_needed); 150689bddce5SStephen Hemminger if (sock) { 15078efa6e93SPavel Emelyanov somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn; 150895c96174SEric Dumazet if ((unsigned int)backlog > somaxconn) 1509b8e1f9b5SPavel Emelyanov backlog = somaxconn; 15101da177e4SLinus Torvalds 15111da177e4SLinus Torvalds err = security_socket_listen(sock, backlog); 15126cb153caSBenjamin LaHaise if (!err) 15131da177e4SLinus Torvalds err = sock->ops->listen(sock, backlog); 15146cb153caSBenjamin LaHaise 15156cb153caSBenjamin LaHaise fput_light(sock->file, fput_needed); 15161da177e4SLinus Torvalds } 15171da177e4SLinus Torvalds return err; 15181da177e4SLinus Torvalds } 15191da177e4SLinus Torvalds 15201da177e4SLinus Torvalds /* 15211da177e4SLinus Torvalds * For accept, we attempt to create a new socket, set up the link 15221da177e4SLinus Torvalds * with the client, wake up the client, then return the new 15231da177e4SLinus Torvalds * connected fd. We collect the address of the connector in kernel 15241da177e4SLinus Torvalds * space and move it to user at the very end. This is unclean because 15251da177e4SLinus Torvalds * we open the socket then return an error. 15261da177e4SLinus Torvalds * 15271da177e4SLinus Torvalds * 1003.1g adds the ability to recvmsg() to query connection pending 15281da177e4SLinus Torvalds * status to recvmsg. We need to add that support in a way thats 15291da177e4SLinus Torvalds * clean when we restucture accept also. 15301da177e4SLinus Torvalds */ 15311da177e4SLinus Torvalds 15324541e805SDominik Brodowski int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr, 15334541e805SDominik Brodowski int __user *upeer_addrlen, int flags) 15341da177e4SLinus Torvalds { 15351da177e4SLinus Torvalds struct socket *sock, *newsock; 153639d8c1b6SDavid S. Miller struct file *newfile; 15376cb153caSBenjamin LaHaise int err, len, newfd, fput_needed; 1538230b1839SYOSHIFUJI Hideaki struct sockaddr_storage address; 15391da177e4SLinus Torvalds 154077d27200SUlrich Drepper if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1541aaca0bdcSUlrich Drepper return -EINVAL; 1542aaca0bdcSUlrich Drepper 1543aaca0bdcSUlrich Drepper if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1544aaca0bdcSUlrich Drepper flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1545aaca0bdcSUlrich Drepper 15466cb153caSBenjamin LaHaise sock = sockfd_lookup_light(fd, &err, &fput_needed); 15471da177e4SLinus Torvalds if (!sock) 15481da177e4SLinus Torvalds goto out; 15491da177e4SLinus Torvalds 15501da177e4SLinus Torvalds err = -ENFILE; 1551c6d409cfSEric Dumazet newsock = sock_alloc(); 1552c6d409cfSEric Dumazet if (!newsock) 15531da177e4SLinus Torvalds goto out_put; 15541da177e4SLinus Torvalds 15551da177e4SLinus Torvalds newsock->type = sock->type; 15561da177e4SLinus Torvalds newsock->ops = sock->ops; 15571da177e4SLinus Torvalds 15581da177e4SLinus Torvalds /* 15591da177e4SLinus Torvalds * We don't need try_module_get here, as the listening socket (sock) 15601da177e4SLinus Torvalds * has the protocol module (sock->ops->owner) held. 15611da177e4SLinus Torvalds */ 15621da177e4SLinus Torvalds __module_get(newsock->ops->owner); 15631da177e4SLinus Torvalds 156428407630SAl Viro newfd = get_unused_fd_flags(flags); 156539d8c1b6SDavid S. Miller if (unlikely(newfd < 0)) { 156639d8c1b6SDavid S. Miller err = newfd; 15679a1875e6SDavid S. Miller sock_release(newsock); 15689a1875e6SDavid S. Miller goto out_put; 156939d8c1b6SDavid S. Miller } 1570aab174f0SLinus Torvalds newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name); 1571b5ffe634SViresh Kumar if (IS_ERR(newfile)) { 157228407630SAl Viro err = PTR_ERR(newfile); 157328407630SAl Viro put_unused_fd(newfd); 157428407630SAl Viro goto out_put; 157528407630SAl Viro } 157639d8c1b6SDavid S. Miller 1577a79af59eSFrank Filz err = security_socket_accept(sock, newsock); 1578a79af59eSFrank Filz if (err) 157939d8c1b6SDavid S. Miller goto out_fd; 1580a79af59eSFrank Filz 1581cdfbabfbSDavid Howells err = sock->ops->accept(sock, newsock, sock->file->f_flags, false); 15821da177e4SLinus Torvalds if (err < 0) 158339d8c1b6SDavid S. Miller goto out_fd; 15841da177e4SLinus Torvalds 15851da177e4SLinus Torvalds if (upeer_sockaddr) { 1586230b1839SYOSHIFUJI Hideaki if (newsock->ops->getname(newsock, (struct sockaddr *)&address, 158789bddce5SStephen Hemminger &len, 2) < 0) { 15881da177e4SLinus Torvalds err = -ECONNABORTED; 158939d8c1b6SDavid S. Miller goto out_fd; 15901da177e4SLinus Torvalds } 159143db362dSMaciej Żenczykowski err = move_addr_to_user(&address, 1592230b1839SYOSHIFUJI Hideaki len, upeer_sockaddr, upeer_addrlen); 15931da177e4SLinus Torvalds if (err < 0) 159439d8c1b6SDavid S. Miller goto out_fd; 15951da177e4SLinus Torvalds } 15961da177e4SLinus Torvalds 15971da177e4SLinus Torvalds /* File flags are not inherited via accept() unlike another OSes. */ 15981da177e4SLinus Torvalds 159939d8c1b6SDavid S. Miller fd_install(newfd, newfile); 160039d8c1b6SDavid S. Miller err = newfd; 16011da177e4SLinus Torvalds 16021da177e4SLinus Torvalds out_put: 16036cb153caSBenjamin LaHaise fput_light(sock->file, fput_needed); 16041da177e4SLinus Torvalds out: 16051da177e4SLinus Torvalds return err; 160639d8c1b6SDavid S. Miller out_fd: 16079606a216SDavid S. Miller fput(newfile); 160839d8c1b6SDavid S. Miller put_unused_fd(newfd); 16091da177e4SLinus Torvalds goto out_put; 16101da177e4SLinus Torvalds } 16111da177e4SLinus Torvalds 16124541e805SDominik Brodowski SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr, 16134541e805SDominik Brodowski int __user *, upeer_addrlen, int, flags) 16144541e805SDominik Brodowski { 16154541e805SDominik Brodowski return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, flags); 16164541e805SDominik Brodowski } 16174541e805SDominik Brodowski 161820f37034SHeiko Carstens SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr, 161920f37034SHeiko Carstens int __user *, upeer_addrlen) 1620aaca0bdcSUlrich Drepper { 16214541e805SDominik Brodowski return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0); 1622aaca0bdcSUlrich Drepper } 1623aaca0bdcSUlrich Drepper 16241da177e4SLinus Torvalds /* 16251da177e4SLinus Torvalds * Attempt to connect to a socket with the server address. The address 16261da177e4SLinus Torvalds * is in user space so we verify it is OK and move it to kernel space. 16271da177e4SLinus Torvalds * 16281da177e4SLinus Torvalds * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to 16291da177e4SLinus Torvalds * break bindings 16301da177e4SLinus Torvalds * 16311da177e4SLinus Torvalds * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and 16321da177e4SLinus Torvalds * other SEQPACKET protocols that take time to connect() as it doesn't 16331da177e4SLinus Torvalds * include the -EINPROGRESS status for such sockets. 16341da177e4SLinus Torvalds */ 16351da177e4SLinus Torvalds 163620f37034SHeiko Carstens SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr, 163720f37034SHeiko Carstens int, addrlen) 16381da177e4SLinus Torvalds { 16391da177e4SLinus Torvalds struct socket *sock; 1640230b1839SYOSHIFUJI Hideaki struct sockaddr_storage address; 16416cb153caSBenjamin LaHaise int err, fput_needed; 16421da177e4SLinus Torvalds 16436cb153caSBenjamin LaHaise sock = sockfd_lookup_light(fd, &err, &fput_needed); 16441da177e4SLinus Torvalds if (!sock) 16451da177e4SLinus Torvalds goto out; 164643db362dSMaciej Żenczykowski err = move_addr_to_kernel(uservaddr, addrlen, &address); 16471da177e4SLinus Torvalds if (err < 0) 16481da177e4SLinus Torvalds goto out_put; 16491da177e4SLinus Torvalds 165089bddce5SStephen Hemminger err = 1651230b1839SYOSHIFUJI Hideaki security_socket_connect(sock, (struct sockaddr *)&address, addrlen); 16521da177e4SLinus Torvalds if (err) 16531da177e4SLinus Torvalds goto out_put; 16541da177e4SLinus Torvalds 1655230b1839SYOSHIFUJI Hideaki err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen, 16561da177e4SLinus Torvalds sock->file->f_flags); 16571da177e4SLinus Torvalds out_put: 16586cb153caSBenjamin LaHaise fput_light(sock->file, fput_needed); 16591da177e4SLinus Torvalds out: 16601da177e4SLinus Torvalds return err; 16611da177e4SLinus Torvalds } 16621da177e4SLinus Torvalds 16631da177e4SLinus Torvalds /* 16641da177e4SLinus Torvalds * Get the local address ('name') of a socket object. Move the obtained 16651da177e4SLinus Torvalds * name to user space. 16661da177e4SLinus Torvalds */ 16671da177e4SLinus Torvalds 166820f37034SHeiko Carstens SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr, 166920f37034SHeiko Carstens int __user *, usockaddr_len) 16701da177e4SLinus Torvalds { 16711da177e4SLinus Torvalds struct socket *sock; 1672230b1839SYOSHIFUJI Hideaki struct sockaddr_storage address; 16736cb153caSBenjamin LaHaise int len, err, fput_needed; 16741da177e4SLinus Torvalds 16756cb153caSBenjamin LaHaise sock = sockfd_lookup_light(fd, &err, &fput_needed); 16761da177e4SLinus Torvalds if (!sock) 16771da177e4SLinus Torvalds goto out; 16781da177e4SLinus Torvalds 16791da177e4SLinus Torvalds err = security_socket_getsockname(sock); 16801da177e4SLinus Torvalds if (err) 16811da177e4SLinus Torvalds goto out_put; 16821da177e4SLinus Torvalds 1683230b1839SYOSHIFUJI Hideaki err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0); 16841da177e4SLinus Torvalds if (err) 16851da177e4SLinus Torvalds goto out_put; 168643db362dSMaciej Żenczykowski err = move_addr_to_user(&address, len, usockaddr, usockaddr_len); 16871da177e4SLinus Torvalds 16881da177e4SLinus Torvalds out_put: 16896cb153caSBenjamin LaHaise fput_light(sock->file, fput_needed); 16901da177e4SLinus Torvalds out: 16911da177e4SLinus Torvalds return err; 16921da177e4SLinus Torvalds } 16931da177e4SLinus Torvalds 16941da177e4SLinus Torvalds /* 16951da177e4SLinus Torvalds * Get the remote address ('name') of a socket object. Move the obtained 16961da177e4SLinus Torvalds * name to user space. 16971da177e4SLinus Torvalds */ 16981da177e4SLinus Torvalds 169920f37034SHeiko Carstens SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr, 170020f37034SHeiko Carstens int __user *, usockaddr_len) 17011da177e4SLinus Torvalds { 17021da177e4SLinus Torvalds struct socket *sock; 1703230b1839SYOSHIFUJI Hideaki struct sockaddr_storage address; 17046cb153caSBenjamin LaHaise int len, err, fput_needed; 17051da177e4SLinus Torvalds 170689bddce5SStephen Hemminger sock = sockfd_lookup_light(fd, &err, &fput_needed); 170789bddce5SStephen Hemminger if (sock != NULL) { 17081da177e4SLinus Torvalds err = security_socket_getpeername(sock); 17091da177e4SLinus Torvalds if (err) { 17106cb153caSBenjamin LaHaise fput_light(sock->file, fput_needed); 17111da177e4SLinus Torvalds return err; 17121da177e4SLinus Torvalds } 17131da177e4SLinus Torvalds 171489bddce5SStephen Hemminger err = 1715230b1839SYOSHIFUJI Hideaki sock->ops->getname(sock, (struct sockaddr *)&address, &len, 171689bddce5SStephen Hemminger 1); 17171da177e4SLinus Torvalds if (!err) 171843db362dSMaciej Żenczykowski err = move_addr_to_user(&address, len, usockaddr, 171989bddce5SStephen Hemminger usockaddr_len); 17206cb153caSBenjamin LaHaise fput_light(sock->file, fput_needed); 17211da177e4SLinus Torvalds } 17221da177e4SLinus Torvalds return err; 17231da177e4SLinus Torvalds } 17241da177e4SLinus Torvalds 17251da177e4SLinus Torvalds /* 17261da177e4SLinus Torvalds * Send a datagram to a given address. We move the address into kernel 17271da177e4SLinus Torvalds * space and check the user space data area is readable before invoking 17281da177e4SLinus Torvalds * the protocol. 17291da177e4SLinus Torvalds */ 1730211b634bSDominik Brodowski int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags, 1731211b634bSDominik Brodowski struct sockaddr __user *addr, int addr_len) 17321da177e4SLinus Torvalds { 17331da177e4SLinus Torvalds struct socket *sock; 1734230b1839SYOSHIFUJI Hideaki struct sockaddr_storage address; 17351da177e4SLinus Torvalds int err; 17361da177e4SLinus Torvalds struct msghdr msg; 17371da177e4SLinus Torvalds struct iovec iov; 17386cb153caSBenjamin LaHaise int fput_needed; 17391da177e4SLinus Torvalds 1740602bd0e9SAl Viro err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter); 1741602bd0e9SAl Viro if (unlikely(err)) 1742602bd0e9SAl Viro return err; 1743de0fa95cSPavel Emelyanov sock = sockfd_lookup_light(fd, &err, &fput_needed); 1744de0fa95cSPavel Emelyanov if (!sock) 17454387ff75SDavid S. Miller goto out; 17466cb153caSBenjamin LaHaise 17471da177e4SLinus Torvalds msg.msg_name = NULL; 17481da177e4SLinus Torvalds msg.msg_control = NULL; 17491da177e4SLinus Torvalds msg.msg_controllen = 0; 17501da177e4SLinus Torvalds msg.msg_namelen = 0; 17516cb153caSBenjamin LaHaise if (addr) { 175243db362dSMaciej Żenczykowski err = move_addr_to_kernel(addr, addr_len, &address); 17531da177e4SLinus Torvalds if (err < 0) 17541da177e4SLinus Torvalds goto out_put; 1755230b1839SYOSHIFUJI Hideaki msg.msg_name = (struct sockaddr *)&address; 17561da177e4SLinus Torvalds msg.msg_namelen = addr_len; 17571da177e4SLinus Torvalds } 17581da177e4SLinus Torvalds if (sock->file->f_flags & O_NONBLOCK) 17591da177e4SLinus Torvalds flags |= MSG_DONTWAIT; 17601da177e4SLinus Torvalds msg.msg_flags = flags; 1761d8725c86SAl Viro err = sock_sendmsg(sock, &msg); 17621da177e4SLinus Torvalds 17631da177e4SLinus Torvalds out_put: 1764de0fa95cSPavel Emelyanov fput_light(sock->file, fput_needed); 17654387ff75SDavid S. Miller out: 17661da177e4SLinus Torvalds return err; 17671da177e4SLinus Torvalds } 17681da177e4SLinus Torvalds 1769211b634bSDominik Brodowski SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len, 1770211b634bSDominik Brodowski unsigned int, flags, struct sockaddr __user *, addr, 1771211b634bSDominik Brodowski int, addr_len) 1772211b634bSDominik Brodowski { 1773211b634bSDominik Brodowski return __sys_sendto(fd, buff, len, flags, addr, addr_len); 1774211b634bSDominik Brodowski } 1775211b634bSDominik Brodowski 17761da177e4SLinus Torvalds /* 17771da177e4SLinus Torvalds * Send a datagram down a socket. 17781da177e4SLinus Torvalds */ 17791da177e4SLinus Torvalds 17803e0fa65fSHeiko Carstens SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len, 178195c96174SEric Dumazet unsigned int, flags) 17821da177e4SLinus Torvalds { 1783211b634bSDominik Brodowski return __sys_sendto(fd, buff, len, flags, NULL, 0); 17841da177e4SLinus Torvalds } 17851da177e4SLinus Torvalds 17861da177e4SLinus Torvalds /* 17871da177e4SLinus Torvalds * Receive a frame from the socket and optionally record the address of the 17881da177e4SLinus Torvalds * sender. We verify the buffers are writable and if needed move the 17891da177e4SLinus Torvalds * sender address from kernel to user space. 17901da177e4SLinus Torvalds */ 17917a09e1ebSDominik Brodowski int __sys_recvfrom(int fd, void __user *ubuf, size_t size, unsigned int flags, 17927a09e1ebSDominik Brodowski struct sockaddr __user *addr, int __user *addr_len) 17931da177e4SLinus Torvalds { 17941da177e4SLinus Torvalds struct socket *sock; 17951da177e4SLinus Torvalds struct iovec iov; 17961da177e4SLinus Torvalds struct msghdr msg; 1797230b1839SYOSHIFUJI Hideaki struct sockaddr_storage address; 17981da177e4SLinus Torvalds int err, err2; 17996cb153caSBenjamin LaHaise int fput_needed; 18001da177e4SLinus Torvalds 1801602bd0e9SAl Viro err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter); 1802602bd0e9SAl Viro if (unlikely(err)) 1803602bd0e9SAl Viro return err; 1804de0fa95cSPavel Emelyanov sock = sockfd_lookup_light(fd, &err, &fput_needed); 18051da177e4SLinus Torvalds if (!sock) 1806de0fa95cSPavel Emelyanov goto out; 18071da177e4SLinus Torvalds 18081da177e4SLinus Torvalds msg.msg_control = NULL; 18091da177e4SLinus Torvalds msg.msg_controllen = 0; 1810f3d33426SHannes Frederic Sowa /* Save some cycles and don't copy the address if not needed */ 1811f3d33426SHannes Frederic Sowa msg.msg_name = addr ? (struct sockaddr *)&address : NULL; 1812f3d33426SHannes Frederic Sowa /* We assume all kernel code knows the size of sockaddr_storage */ 1813f3d33426SHannes Frederic Sowa msg.msg_namelen = 0; 1814130ed5d1Stadeusz.struk@intel.com msg.msg_iocb = NULL; 18159f138fa6SAlexander Potapenko msg.msg_flags = 0; 18161da177e4SLinus Torvalds if (sock->file->f_flags & O_NONBLOCK) 18171da177e4SLinus Torvalds flags |= MSG_DONTWAIT; 18182da62906SAl Viro err = sock_recvmsg(sock, &msg, flags); 18191da177e4SLinus Torvalds 182089bddce5SStephen Hemminger if (err >= 0 && addr != NULL) { 182143db362dSMaciej Żenczykowski err2 = move_addr_to_user(&address, 1822230b1839SYOSHIFUJI Hideaki msg.msg_namelen, addr, addr_len); 18231da177e4SLinus Torvalds if (err2 < 0) 18241da177e4SLinus Torvalds err = err2; 18251da177e4SLinus Torvalds } 1826de0fa95cSPavel Emelyanov 1827de0fa95cSPavel Emelyanov fput_light(sock->file, fput_needed); 18284387ff75SDavid S. Miller out: 18291da177e4SLinus Torvalds return err; 18301da177e4SLinus Torvalds } 18311da177e4SLinus Torvalds 18327a09e1ebSDominik Brodowski SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, 18337a09e1ebSDominik Brodowski unsigned int, flags, struct sockaddr __user *, addr, 18347a09e1ebSDominik Brodowski int __user *, addr_len) 18357a09e1ebSDominik Brodowski { 18367a09e1ebSDominik Brodowski return __sys_recvfrom(fd, ubuf, size, flags, addr, addr_len); 18377a09e1ebSDominik Brodowski } 18387a09e1ebSDominik Brodowski 18391da177e4SLinus Torvalds /* 18401da177e4SLinus Torvalds * Receive a datagram from a socket. 18411da177e4SLinus Torvalds */ 18421da177e4SLinus Torvalds 1843b7c0ddf5SJan Glauber SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size, 1844b7c0ddf5SJan Glauber unsigned int, flags) 18451da177e4SLinus Torvalds { 18467a09e1ebSDominik Brodowski return __sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); 18471da177e4SLinus Torvalds } 18481da177e4SLinus Torvalds 18491da177e4SLinus Torvalds /* 18501da177e4SLinus Torvalds * Set a socket option. Because we don't know the option lengths we have 18511da177e4SLinus Torvalds * to pass the user mode parameter for the protocols to sort out. 18521da177e4SLinus Torvalds */ 18531da177e4SLinus Torvalds 185420f37034SHeiko Carstens SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, 185520f37034SHeiko Carstens char __user *, optval, int, optlen) 18561da177e4SLinus Torvalds { 18576cb153caSBenjamin LaHaise int err, fput_needed; 18581da177e4SLinus Torvalds struct socket *sock; 18591da177e4SLinus Torvalds 18601da177e4SLinus Torvalds if (optlen < 0) 18611da177e4SLinus Torvalds return -EINVAL; 18621da177e4SLinus Torvalds 186389bddce5SStephen Hemminger sock = sockfd_lookup_light(fd, &err, &fput_needed); 186489bddce5SStephen Hemminger if (sock != NULL) { 18651da177e4SLinus Torvalds err = security_socket_setsockopt(sock, level, optname); 18666cb153caSBenjamin LaHaise if (err) 18676cb153caSBenjamin LaHaise goto out_put; 18681da177e4SLinus Torvalds 18691da177e4SLinus Torvalds if (level == SOL_SOCKET) 187089bddce5SStephen Hemminger err = 187189bddce5SStephen Hemminger sock_setsockopt(sock, level, optname, optval, 187289bddce5SStephen Hemminger optlen); 18731da177e4SLinus Torvalds else 187489bddce5SStephen Hemminger err = 187589bddce5SStephen Hemminger sock->ops->setsockopt(sock, level, optname, optval, 187689bddce5SStephen Hemminger optlen); 18776cb153caSBenjamin LaHaise out_put: 18786cb153caSBenjamin LaHaise fput_light(sock->file, fput_needed); 18791da177e4SLinus Torvalds } 18801da177e4SLinus Torvalds return err; 18811da177e4SLinus Torvalds } 18821da177e4SLinus Torvalds 18831da177e4SLinus Torvalds /* 18841da177e4SLinus Torvalds * Get a socket option. Because we don't know the option lengths we have 18851da177e4SLinus Torvalds * to pass a user mode parameter for the protocols to sort out. 18861da177e4SLinus Torvalds */ 18871da177e4SLinus Torvalds 188820f37034SHeiko Carstens SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, 188920f37034SHeiko Carstens char __user *, optval, int __user *, optlen) 18901da177e4SLinus Torvalds { 18916cb153caSBenjamin LaHaise int err, fput_needed; 18921da177e4SLinus Torvalds struct socket *sock; 18931da177e4SLinus Torvalds 189489bddce5SStephen Hemminger sock = sockfd_lookup_light(fd, &err, &fput_needed); 189589bddce5SStephen Hemminger if (sock != NULL) { 18966cb153caSBenjamin LaHaise err = security_socket_getsockopt(sock, level, optname); 18976cb153caSBenjamin LaHaise if (err) 18986cb153caSBenjamin LaHaise goto out_put; 18991da177e4SLinus Torvalds 19001da177e4SLinus Torvalds if (level == SOL_SOCKET) 190189bddce5SStephen Hemminger err = 190289bddce5SStephen Hemminger sock_getsockopt(sock, level, optname, optval, 190389bddce5SStephen Hemminger optlen); 19041da177e4SLinus Torvalds else 190589bddce5SStephen Hemminger err = 190689bddce5SStephen Hemminger sock->ops->getsockopt(sock, level, optname, optval, 190789bddce5SStephen Hemminger optlen); 19086cb153caSBenjamin LaHaise out_put: 19096cb153caSBenjamin LaHaise fput_light(sock->file, fput_needed); 19101da177e4SLinus Torvalds } 19111da177e4SLinus Torvalds return err; 19121da177e4SLinus Torvalds } 19131da177e4SLinus Torvalds 19141da177e4SLinus Torvalds /* 19151da177e4SLinus Torvalds * Shutdown a socket. 19161da177e4SLinus Torvalds */ 19171da177e4SLinus Torvalds 1918754fe8d2SHeiko Carstens SYSCALL_DEFINE2(shutdown, int, fd, int, how) 19191da177e4SLinus Torvalds { 19206cb153caSBenjamin LaHaise int err, fput_needed; 19211da177e4SLinus Torvalds struct socket *sock; 19221da177e4SLinus Torvalds 192389bddce5SStephen Hemminger sock = sockfd_lookup_light(fd, &err, &fput_needed); 192489bddce5SStephen Hemminger if (sock != NULL) { 19251da177e4SLinus Torvalds err = security_socket_shutdown(sock, how); 19266cb153caSBenjamin LaHaise if (!err) 19271da177e4SLinus Torvalds err = sock->ops->shutdown(sock, how); 19286cb153caSBenjamin LaHaise fput_light(sock->file, fput_needed); 19291da177e4SLinus Torvalds } 19301da177e4SLinus Torvalds return err; 19311da177e4SLinus Torvalds } 19321da177e4SLinus Torvalds 19331da177e4SLinus Torvalds /* A couple of helpful macros for getting the address of the 32/64 bit 19341da177e4SLinus Torvalds * fields which are the same type (int / unsigned) on our platforms. 19351da177e4SLinus Torvalds */ 19361da177e4SLinus Torvalds #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) 19371da177e4SLinus Torvalds #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) 19381da177e4SLinus Torvalds #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) 19391da177e4SLinus Torvalds 1940c71d8ebeSTetsuo Handa struct used_address { 1941c71d8ebeSTetsuo Handa struct sockaddr_storage name; 1942c71d8ebeSTetsuo Handa unsigned int name_len; 1943c71d8ebeSTetsuo Handa }; 1944c71d8ebeSTetsuo Handa 1945da184284SAl Viro static int copy_msghdr_from_user(struct msghdr *kmsg, 194608adb7daSAl Viro struct user_msghdr __user *umsg, 194708adb7daSAl Viro struct sockaddr __user **save_addr, 194808adb7daSAl Viro struct iovec **iov) 19491661bf36SDan Carpenter { 1950ffb07550SAl Viro struct user_msghdr msg; 195108adb7daSAl Viro ssize_t err; 195208adb7daSAl Viro 1953ffb07550SAl Viro if (copy_from_user(&msg, umsg, sizeof(*umsg))) 19541661bf36SDan Carpenter return -EFAULT; 1955dbb490b9SMatthew Leach 1956864d9664SPaolo Abeni kmsg->msg_control = (void __force *)msg.msg_control; 1957ffb07550SAl Viro kmsg->msg_controllen = msg.msg_controllen; 1958ffb07550SAl Viro kmsg->msg_flags = msg.msg_flags; 1959ffb07550SAl Viro 1960ffb07550SAl Viro kmsg->msg_namelen = msg.msg_namelen; 1961ffb07550SAl Viro if (!msg.msg_name) 19626a2a2b3aSAni Sinha kmsg->msg_namelen = 0; 19636a2a2b3aSAni Sinha 1964dbb490b9SMatthew Leach if (kmsg->msg_namelen < 0) 1965dbb490b9SMatthew Leach return -EINVAL; 1966dbb490b9SMatthew Leach 19671661bf36SDan Carpenter if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) 1968db31c55aSDan Carpenter kmsg->msg_namelen = sizeof(struct sockaddr_storage); 196908adb7daSAl Viro 197008adb7daSAl Viro if (save_addr) 1971ffb07550SAl Viro *save_addr = msg.msg_name; 197208adb7daSAl Viro 1973ffb07550SAl Viro if (msg.msg_name && kmsg->msg_namelen) { 197408adb7daSAl Viro if (!save_addr) { 1975864d9664SPaolo Abeni err = move_addr_to_kernel(msg.msg_name, 1976864d9664SPaolo Abeni kmsg->msg_namelen, 197708adb7daSAl Viro kmsg->msg_name); 197808adb7daSAl Viro if (err < 0) 197908adb7daSAl Viro return err; 198008adb7daSAl Viro } 198108adb7daSAl Viro } else { 198208adb7daSAl Viro kmsg->msg_name = NULL; 198308adb7daSAl Viro kmsg->msg_namelen = 0; 198408adb7daSAl Viro } 198508adb7daSAl Viro 1986ffb07550SAl Viro if (msg.msg_iovlen > UIO_MAXIOV) 198708adb7daSAl Viro return -EMSGSIZE; 198808adb7daSAl Viro 19890345f931Stadeusz.struk@intel.com kmsg->msg_iocb = NULL; 19900345f931Stadeusz.struk@intel.com 1991ffb07550SAl Viro return import_iovec(save_addr ? READ : WRITE, 1992ffb07550SAl Viro msg.msg_iov, msg.msg_iovlen, 1993da184284SAl Viro UIO_FASTIOV, iov, &kmsg->msg_iter); 19941661bf36SDan Carpenter } 19951661bf36SDan Carpenter 1996666547ffSAl Viro static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg, 199795c96174SEric Dumazet struct msghdr *msg_sys, unsigned int flags, 199828a94d8fSTom Herbert struct used_address *used_address, 199928a94d8fSTom Herbert unsigned int allowed_msghdr_flags) 20001da177e4SLinus Torvalds { 200189bddce5SStephen Hemminger struct compat_msghdr __user *msg_compat = 200289bddce5SStephen Hemminger (struct compat_msghdr __user *)msg; 2003230b1839SYOSHIFUJI Hideaki struct sockaddr_storage address; 20041da177e4SLinus Torvalds struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; 2005b9d717a7SAlex Williamson unsigned char ctl[sizeof(struct cmsghdr) + 20] 2006846cc123SAmit Kushwaha __aligned(sizeof(__kernel_size_t)); 2007b9d717a7SAlex Williamson /* 20 is size of ipv6_pktinfo */ 20081da177e4SLinus Torvalds unsigned char *ctl_buf = ctl; 2009d8725c86SAl Viro int ctl_len; 201008adb7daSAl Viro ssize_t err; 20111da177e4SLinus Torvalds 201208adb7daSAl Viro msg_sys->msg_name = &address; 20131da177e4SLinus Torvalds 201408449320SAl Viro if (MSG_CMSG_COMPAT & flags) 201508adb7daSAl Viro err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov); 201608449320SAl Viro else 201708adb7daSAl Viro err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov); 20181da177e4SLinus Torvalds if (err < 0) 2019da184284SAl Viro return err; 20201da177e4SLinus Torvalds 20211da177e4SLinus Torvalds err = -ENOBUFS; 20221da177e4SLinus Torvalds 2023228e548eSAnton Blanchard if (msg_sys->msg_controllen > INT_MAX) 20241da177e4SLinus Torvalds goto out_freeiov; 202528a94d8fSTom Herbert flags |= (msg_sys->msg_flags & allowed_msghdr_flags); 2026228e548eSAnton Blanchard ctl_len = msg_sys->msg_controllen; 20271da177e4SLinus Torvalds if ((MSG_CMSG_COMPAT & flags) && ctl_len) { 202889bddce5SStephen Hemminger err = 2029228e548eSAnton Blanchard cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl, 203089bddce5SStephen Hemminger sizeof(ctl)); 20311da177e4SLinus Torvalds if (err) 20321da177e4SLinus Torvalds goto out_freeiov; 2033228e548eSAnton Blanchard ctl_buf = msg_sys->msg_control; 2034228e548eSAnton Blanchard ctl_len = msg_sys->msg_controllen; 20351da177e4SLinus Torvalds } else if (ctl_len) { 2036ac4340fcSDavid S. Miller BUILD_BUG_ON(sizeof(struct cmsghdr) != 2037ac4340fcSDavid S. Miller CMSG_ALIGN(sizeof(struct cmsghdr))); 203889bddce5SStephen Hemminger if (ctl_len > sizeof(ctl)) { 20391da177e4SLinus Torvalds ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); 20401da177e4SLinus Torvalds if (ctl_buf == NULL) 20411da177e4SLinus Torvalds goto out_freeiov; 20421da177e4SLinus Torvalds } 20431da177e4SLinus Torvalds err = -EFAULT; 20441da177e4SLinus Torvalds /* 2045228e548eSAnton Blanchard * Careful! Before this, msg_sys->msg_control contains a user pointer. 20461da177e4SLinus Torvalds * Afterwards, it will be a kernel pointer. Thus the compiler-assisted 20471da177e4SLinus Torvalds * checking falls down on this. 20481da177e4SLinus Torvalds */ 2049fb8621bbSNamhyung Kim if (copy_from_user(ctl_buf, 2050228e548eSAnton Blanchard (void __user __force *)msg_sys->msg_control, 205189bddce5SStephen Hemminger ctl_len)) 20521da177e4SLinus Torvalds goto out_freectl; 2053228e548eSAnton Blanchard msg_sys->msg_control = ctl_buf; 20541da177e4SLinus Torvalds } 2055228e548eSAnton Blanchard msg_sys->msg_flags = flags; 20561da177e4SLinus Torvalds 20571da177e4SLinus Torvalds if (sock->file->f_flags & O_NONBLOCK) 2058228e548eSAnton Blanchard msg_sys->msg_flags |= MSG_DONTWAIT; 2059c71d8ebeSTetsuo Handa /* 2060c71d8ebeSTetsuo Handa * If this is sendmmsg() and current destination address is same as 2061c71d8ebeSTetsuo Handa * previously succeeded address, omit asking LSM's decision. 2062c71d8ebeSTetsuo Handa * used_address->name_len is initialized to UINT_MAX so that the first 2063c71d8ebeSTetsuo Handa * destination address never matches. 2064c71d8ebeSTetsuo Handa */ 2065bc909d9dSMathieu Desnoyers if (used_address && msg_sys->msg_name && 2066bc909d9dSMathieu Desnoyers used_address->name_len == msg_sys->msg_namelen && 2067bc909d9dSMathieu Desnoyers !memcmp(&used_address->name, msg_sys->msg_name, 2068c71d8ebeSTetsuo Handa used_address->name_len)) { 2069d8725c86SAl Viro err = sock_sendmsg_nosec(sock, msg_sys); 2070c71d8ebeSTetsuo Handa goto out_freectl; 2071c71d8ebeSTetsuo Handa } 2072d8725c86SAl Viro err = sock_sendmsg(sock, msg_sys); 2073c71d8ebeSTetsuo Handa /* 2074c71d8ebeSTetsuo Handa * If this is sendmmsg() and sending to current destination address was 2075c71d8ebeSTetsuo Handa * successful, remember it. 2076c71d8ebeSTetsuo Handa */ 2077c71d8ebeSTetsuo Handa if (used_address && err >= 0) { 2078c71d8ebeSTetsuo Handa used_address->name_len = msg_sys->msg_namelen; 2079bc909d9dSMathieu Desnoyers if (msg_sys->msg_name) 2080bc909d9dSMathieu Desnoyers memcpy(&used_address->name, msg_sys->msg_name, 2081c71d8ebeSTetsuo Handa used_address->name_len); 2082c71d8ebeSTetsuo Handa } 20831da177e4SLinus Torvalds 20841da177e4SLinus Torvalds out_freectl: 20851da177e4SLinus Torvalds if (ctl_buf != ctl) 20861da177e4SLinus Torvalds sock_kfree_s(sock->sk, ctl_buf, ctl_len); 20871da177e4SLinus Torvalds out_freeiov: 2088a74e9106SEric Dumazet kfree(iov); 2089228e548eSAnton Blanchard return err; 2090228e548eSAnton Blanchard } 2091228e548eSAnton Blanchard 2092228e548eSAnton Blanchard /* 2093228e548eSAnton Blanchard * BSD sendmsg interface 2094228e548eSAnton Blanchard */ 2095228e548eSAnton Blanchard 2096666547ffSAl Viro long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags) 2097228e548eSAnton Blanchard { 2098228e548eSAnton Blanchard int fput_needed, err; 2099228e548eSAnton Blanchard struct msghdr msg_sys; 21001be374a0SAndy Lutomirski struct socket *sock; 2101228e548eSAnton Blanchard 21021be374a0SAndy Lutomirski sock = sockfd_lookup_light(fd, &err, &fput_needed); 2103228e548eSAnton Blanchard if (!sock) 2104228e548eSAnton Blanchard goto out; 2105228e548eSAnton Blanchard 210628a94d8fSTom Herbert err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0); 2107228e548eSAnton Blanchard 21086cb153caSBenjamin LaHaise fput_light(sock->file, fput_needed); 21091da177e4SLinus Torvalds out: 21101da177e4SLinus Torvalds return err; 21111da177e4SLinus Torvalds } 21121da177e4SLinus Torvalds 2113666547ffSAl Viro SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags) 2114a7526eb5SAndy Lutomirski { 2115a7526eb5SAndy Lutomirski if (flags & MSG_CMSG_COMPAT) 2116a7526eb5SAndy Lutomirski return -EINVAL; 2117a7526eb5SAndy Lutomirski return __sys_sendmsg(fd, msg, flags); 2118a7526eb5SAndy Lutomirski } 2119a7526eb5SAndy Lutomirski 2120228e548eSAnton Blanchard /* 2121228e548eSAnton Blanchard * Linux sendmmsg interface 2122228e548eSAnton Blanchard */ 2123228e548eSAnton Blanchard 2124228e548eSAnton Blanchard int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, 2125228e548eSAnton Blanchard unsigned int flags) 2126228e548eSAnton Blanchard { 2127228e548eSAnton Blanchard int fput_needed, err, datagrams; 2128228e548eSAnton Blanchard struct socket *sock; 2129228e548eSAnton Blanchard struct mmsghdr __user *entry; 2130228e548eSAnton Blanchard struct compat_mmsghdr __user *compat_entry; 2131228e548eSAnton Blanchard struct msghdr msg_sys; 2132c71d8ebeSTetsuo Handa struct used_address used_address; 2133f092276dSTom Herbert unsigned int oflags = flags; 2134228e548eSAnton Blanchard 213598382f41SAnton Blanchard if (vlen > UIO_MAXIOV) 213698382f41SAnton Blanchard vlen = UIO_MAXIOV; 2137228e548eSAnton Blanchard 2138228e548eSAnton Blanchard datagrams = 0; 2139228e548eSAnton Blanchard 2140228e548eSAnton Blanchard sock = sockfd_lookup_light(fd, &err, &fput_needed); 2141228e548eSAnton Blanchard if (!sock) 2142228e548eSAnton Blanchard return err; 2143228e548eSAnton Blanchard 2144c71d8ebeSTetsuo Handa used_address.name_len = UINT_MAX; 2145228e548eSAnton Blanchard entry = mmsg; 2146228e548eSAnton Blanchard compat_entry = (struct compat_mmsghdr __user *)mmsg; 2147728ffb86SAnton Blanchard err = 0; 2148f092276dSTom Herbert flags |= MSG_BATCH; 2149228e548eSAnton Blanchard 2150228e548eSAnton Blanchard while (datagrams < vlen) { 2151f092276dSTom Herbert if (datagrams == vlen - 1) 2152f092276dSTom Herbert flags = oflags; 2153f092276dSTom Herbert 2154228e548eSAnton Blanchard if (MSG_CMSG_COMPAT & flags) { 2155666547ffSAl Viro err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry, 215628a94d8fSTom Herbert &msg_sys, flags, &used_address, MSG_EOR); 2157228e548eSAnton Blanchard if (err < 0) 2158228e548eSAnton Blanchard break; 2159228e548eSAnton Blanchard err = __put_user(err, &compat_entry->msg_len); 2160228e548eSAnton Blanchard ++compat_entry; 2161228e548eSAnton Blanchard } else { 2162a7526eb5SAndy Lutomirski err = ___sys_sendmsg(sock, 2163666547ffSAl Viro (struct user_msghdr __user *)entry, 216428a94d8fSTom Herbert &msg_sys, flags, &used_address, MSG_EOR); 2165228e548eSAnton Blanchard if (err < 0) 2166228e548eSAnton Blanchard break; 2167228e548eSAnton Blanchard err = put_user(err, &entry->msg_len); 2168228e548eSAnton Blanchard ++entry; 2169228e548eSAnton Blanchard } 2170228e548eSAnton Blanchard 2171228e548eSAnton Blanchard if (err) 2172228e548eSAnton Blanchard break; 2173228e548eSAnton Blanchard ++datagrams; 21743023898bSSoheil Hassas Yeganeh if (msg_data_left(&msg_sys)) 21753023898bSSoheil Hassas Yeganeh break; 2176a78cb84cSEric Dumazet cond_resched(); 2177228e548eSAnton Blanchard } 2178228e548eSAnton Blanchard 2179228e548eSAnton Blanchard fput_light(sock->file, fput_needed); 2180228e548eSAnton Blanchard 2181728ffb86SAnton Blanchard /* We only return an error if no datagrams were able to be sent */ 2182728ffb86SAnton Blanchard if (datagrams != 0) 2183228e548eSAnton Blanchard return datagrams; 2184228e548eSAnton Blanchard 2185228e548eSAnton Blanchard return err; 2186228e548eSAnton Blanchard } 2187228e548eSAnton Blanchard 2188228e548eSAnton Blanchard SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg, 2189228e548eSAnton Blanchard unsigned int, vlen, unsigned int, flags) 2190228e548eSAnton Blanchard { 21911be374a0SAndy Lutomirski if (flags & MSG_CMSG_COMPAT) 21921be374a0SAndy Lutomirski return -EINVAL; 2193228e548eSAnton Blanchard return __sys_sendmmsg(fd, mmsg, vlen, flags); 2194228e548eSAnton Blanchard } 2195228e548eSAnton Blanchard 2196666547ffSAl Viro static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg, 219795c96174SEric Dumazet struct msghdr *msg_sys, unsigned int flags, int nosec) 21981da177e4SLinus Torvalds { 219989bddce5SStephen Hemminger struct compat_msghdr __user *msg_compat = 220089bddce5SStephen Hemminger (struct compat_msghdr __user *)msg; 22011da177e4SLinus Torvalds struct iovec iovstack[UIO_FASTIOV]; 22021da177e4SLinus Torvalds struct iovec *iov = iovstack; 22031da177e4SLinus Torvalds unsigned long cmsg_ptr; 22042da62906SAl Viro int len; 220508adb7daSAl Viro ssize_t err; 22061da177e4SLinus Torvalds 22071da177e4SLinus Torvalds /* kernel mode address */ 2208230b1839SYOSHIFUJI Hideaki struct sockaddr_storage addr; 22091da177e4SLinus Torvalds 22101da177e4SLinus Torvalds /* user mode address pointers */ 22111da177e4SLinus Torvalds struct sockaddr __user *uaddr; 221208adb7daSAl Viro int __user *uaddr_len = COMPAT_NAMELEN(msg); 22131da177e4SLinus Torvalds 221408adb7daSAl Viro msg_sys->msg_name = &addr; 22151da177e4SLinus Torvalds 2216f3d33426SHannes Frederic Sowa if (MSG_CMSG_COMPAT & flags) 221708adb7daSAl Viro err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov); 2218f3d33426SHannes Frederic Sowa else 221908adb7daSAl Viro err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov); 22201da177e4SLinus Torvalds if (err < 0) 2221da184284SAl Viro return err; 22221da177e4SLinus Torvalds 2223a2e27255SArnaldo Carvalho de Melo cmsg_ptr = (unsigned long)msg_sys->msg_control; 2224a2e27255SArnaldo Carvalho de Melo msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); 22251da177e4SLinus Torvalds 2226f3d33426SHannes Frederic Sowa /* We assume all kernel code knows the size of sockaddr_storage */ 2227f3d33426SHannes Frederic Sowa msg_sys->msg_namelen = 0; 2228f3d33426SHannes Frederic Sowa 22291da177e4SLinus Torvalds if (sock->file->f_flags & O_NONBLOCK) 22301da177e4SLinus Torvalds flags |= MSG_DONTWAIT; 22312da62906SAl Viro err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, flags); 22321da177e4SLinus Torvalds if (err < 0) 22331da177e4SLinus Torvalds goto out_freeiov; 22341da177e4SLinus Torvalds len = err; 22351da177e4SLinus Torvalds 22361da177e4SLinus Torvalds if (uaddr != NULL) { 223743db362dSMaciej Żenczykowski err = move_addr_to_user(&addr, 2238a2e27255SArnaldo Carvalho de Melo msg_sys->msg_namelen, uaddr, 223989bddce5SStephen Hemminger uaddr_len); 22401da177e4SLinus Torvalds if (err < 0) 22411da177e4SLinus Torvalds goto out_freeiov; 22421da177e4SLinus Torvalds } 2243a2e27255SArnaldo Carvalho de Melo err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT), 224437f7f421SDavid S. Miller COMPAT_FLAGS(msg)); 22451da177e4SLinus Torvalds if (err) 22461da177e4SLinus Torvalds goto out_freeiov; 22471da177e4SLinus Torvalds if (MSG_CMSG_COMPAT & flags) 2248a2e27255SArnaldo Carvalho de Melo err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, 22491da177e4SLinus Torvalds &msg_compat->msg_controllen); 22501da177e4SLinus Torvalds else 2251a2e27255SArnaldo Carvalho de Melo err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, 22521da177e4SLinus Torvalds &msg->msg_controllen); 22531da177e4SLinus Torvalds if (err) 22541da177e4SLinus Torvalds goto out_freeiov; 22551da177e4SLinus Torvalds err = len; 22561da177e4SLinus Torvalds 22571da177e4SLinus Torvalds out_freeiov: 2258a74e9106SEric Dumazet kfree(iov); 2259a2e27255SArnaldo Carvalho de Melo return err; 2260a2e27255SArnaldo Carvalho de Melo } 2261a2e27255SArnaldo Carvalho de Melo 2262a2e27255SArnaldo Carvalho de Melo /* 2263a2e27255SArnaldo Carvalho de Melo * BSD recvmsg interface 2264a2e27255SArnaldo Carvalho de Melo */ 2265a2e27255SArnaldo Carvalho de Melo 2266666547ffSAl Viro long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned flags) 2267a2e27255SArnaldo Carvalho de Melo { 2268a2e27255SArnaldo Carvalho de Melo int fput_needed, err; 2269a2e27255SArnaldo Carvalho de Melo struct msghdr msg_sys; 22701be374a0SAndy Lutomirski struct socket *sock; 2271a2e27255SArnaldo Carvalho de Melo 22721be374a0SAndy Lutomirski sock = sockfd_lookup_light(fd, &err, &fput_needed); 2273a2e27255SArnaldo Carvalho de Melo if (!sock) 2274a2e27255SArnaldo Carvalho de Melo goto out; 2275a2e27255SArnaldo Carvalho de Melo 2276a7526eb5SAndy Lutomirski err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0); 2277a2e27255SArnaldo Carvalho de Melo 22786cb153caSBenjamin LaHaise fput_light(sock->file, fput_needed); 22791da177e4SLinus Torvalds out: 22801da177e4SLinus Torvalds return err; 22811da177e4SLinus Torvalds } 22821da177e4SLinus Torvalds 2283666547ffSAl Viro SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg, 2284a7526eb5SAndy Lutomirski unsigned int, flags) 2285a7526eb5SAndy Lutomirski { 2286a7526eb5SAndy Lutomirski if (flags & MSG_CMSG_COMPAT) 2287a7526eb5SAndy Lutomirski return -EINVAL; 2288a7526eb5SAndy Lutomirski return __sys_recvmsg(fd, msg, flags); 2289a7526eb5SAndy Lutomirski } 2290a7526eb5SAndy Lutomirski 2291a2e27255SArnaldo Carvalho de Melo /* 2292a2e27255SArnaldo Carvalho de Melo * Linux recvmmsg interface 2293a2e27255SArnaldo Carvalho de Melo */ 22941da177e4SLinus Torvalds 2295a2e27255SArnaldo Carvalho de Melo int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, 2296a2e27255SArnaldo Carvalho de Melo unsigned int flags, struct timespec *timeout) 2297a2e27255SArnaldo Carvalho de Melo { 2298a2e27255SArnaldo Carvalho de Melo int fput_needed, err, datagrams; 2299a2e27255SArnaldo Carvalho de Melo struct socket *sock; 2300a2e27255SArnaldo Carvalho de Melo struct mmsghdr __user *entry; 2301d7256d0eSJean-Mickael Guerin struct compat_mmsghdr __user *compat_entry; 2302a2e27255SArnaldo Carvalho de Melo struct msghdr msg_sys; 2303766b9f92SDeepa Dinamani struct timespec64 end_time; 2304766b9f92SDeepa Dinamani struct timespec64 timeout64; 2305a2e27255SArnaldo Carvalho de Melo 2306a2e27255SArnaldo Carvalho de Melo if (timeout && 2307a2e27255SArnaldo Carvalho de Melo poll_select_set_timeout(&end_time, timeout->tv_sec, 2308a2e27255SArnaldo Carvalho de Melo timeout->tv_nsec)) 2309a2e27255SArnaldo Carvalho de Melo return -EINVAL; 2310a2e27255SArnaldo Carvalho de Melo 2311a2e27255SArnaldo Carvalho de Melo datagrams = 0; 2312a2e27255SArnaldo Carvalho de Melo 2313a2e27255SArnaldo Carvalho de Melo sock = sockfd_lookup_light(fd, &err, &fput_needed); 2314a2e27255SArnaldo Carvalho de Melo if (!sock) 2315a2e27255SArnaldo Carvalho de Melo return err; 2316a2e27255SArnaldo Carvalho de Melo 2317a2e27255SArnaldo Carvalho de Melo err = sock_error(sock->sk); 2318e623a9e9SMaxime Jayat if (err) { 2319e623a9e9SMaxime Jayat datagrams = err; 2320a2e27255SArnaldo Carvalho de Melo goto out_put; 2321e623a9e9SMaxime Jayat } 2322a2e27255SArnaldo Carvalho de Melo 2323a2e27255SArnaldo Carvalho de Melo entry = mmsg; 2324d7256d0eSJean-Mickael Guerin compat_entry = (struct compat_mmsghdr __user *)mmsg; 2325a2e27255SArnaldo Carvalho de Melo 2326a2e27255SArnaldo Carvalho de Melo while (datagrams < vlen) { 2327a2e27255SArnaldo Carvalho de Melo /* 2328a2e27255SArnaldo Carvalho de Melo * No need to ask LSM for more than the first datagram. 2329a2e27255SArnaldo Carvalho de Melo */ 2330d7256d0eSJean-Mickael Guerin if (MSG_CMSG_COMPAT & flags) { 2331666547ffSAl Viro err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry, 2332b9eb8b87SAnton Blanchard &msg_sys, flags & ~MSG_WAITFORONE, 2333b9eb8b87SAnton Blanchard datagrams); 2334d7256d0eSJean-Mickael Guerin if (err < 0) 2335d7256d0eSJean-Mickael Guerin break; 2336d7256d0eSJean-Mickael Guerin err = __put_user(err, &compat_entry->msg_len); 2337d7256d0eSJean-Mickael Guerin ++compat_entry; 2338d7256d0eSJean-Mickael Guerin } else { 2339a7526eb5SAndy Lutomirski err = ___sys_recvmsg(sock, 2340666547ffSAl Viro (struct user_msghdr __user *)entry, 2341b9eb8b87SAnton Blanchard &msg_sys, flags & ~MSG_WAITFORONE, 2342b9eb8b87SAnton Blanchard datagrams); 2343a2e27255SArnaldo Carvalho de Melo if (err < 0) 2344a2e27255SArnaldo Carvalho de Melo break; 2345a2e27255SArnaldo Carvalho de Melo err = put_user(err, &entry->msg_len); 2346d7256d0eSJean-Mickael Guerin ++entry; 2347d7256d0eSJean-Mickael Guerin } 2348d7256d0eSJean-Mickael Guerin 2349a2e27255SArnaldo Carvalho de Melo if (err) 2350a2e27255SArnaldo Carvalho de Melo break; 2351a2e27255SArnaldo Carvalho de Melo ++datagrams; 2352a2e27255SArnaldo Carvalho de Melo 235371c5c159SBrandon L Black /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */ 235471c5c159SBrandon L Black if (flags & MSG_WAITFORONE) 235571c5c159SBrandon L Black flags |= MSG_DONTWAIT; 235671c5c159SBrandon L Black 2357a2e27255SArnaldo Carvalho de Melo if (timeout) { 2358766b9f92SDeepa Dinamani ktime_get_ts64(&timeout64); 2359766b9f92SDeepa Dinamani *timeout = timespec64_to_timespec( 2360766b9f92SDeepa Dinamani timespec64_sub(end_time, timeout64)); 2361a2e27255SArnaldo Carvalho de Melo if (timeout->tv_sec < 0) { 2362a2e27255SArnaldo Carvalho de Melo timeout->tv_sec = timeout->tv_nsec = 0; 2363a2e27255SArnaldo Carvalho de Melo break; 2364a2e27255SArnaldo Carvalho de Melo } 2365a2e27255SArnaldo Carvalho de Melo 2366a2e27255SArnaldo Carvalho de Melo /* Timeout, return less than vlen datagrams */ 2367a2e27255SArnaldo Carvalho de Melo if (timeout->tv_nsec == 0 && timeout->tv_sec == 0) 2368a2e27255SArnaldo Carvalho de Melo break; 2369a2e27255SArnaldo Carvalho de Melo } 2370a2e27255SArnaldo Carvalho de Melo 2371a2e27255SArnaldo Carvalho de Melo /* Out of band data, return right away */ 2372a2e27255SArnaldo Carvalho de Melo if (msg_sys.msg_flags & MSG_OOB) 2373a2e27255SArnaldo Carvalho de Melo break; 2374a78cb84cSEric Dumazet cond_resched(); 2375a2e27255SArnaldo Carvalho de Melo } 2376a2e27255SArnaldo Carvalho de Melo 2377a2e27255SArnaldo Carvalho de Melo if (err == 0) 237834b88a68SArnaldo Carvalho de Melo goto out_put; 2379a2e27255SArnaldo Carvalho de Melo 238034b88a68SArnaldo Carvalho de Melo if (datagrams == 0) { 238134b88a68SArnaldo Carvalho de Melo datagrams = err; 238234b88a68SArnaldo Carvalho de Melo goto out_put; 238334b88a68SArnaldo Carvalho de Melo } 238434b88a68SArnaldo Carvalho de Melo 2385a2e27255SArnaldo Carvalho de Melo /* 2386a2e27255SArnaldo Carvalho de Melo * We may return less entries than requested (vlen) if the 2387a2e27255SArnaldo Carvalho de Melo * sock is non block and there aren't enough datagrams... 2388a2e27255SArnaldo Carvalho de Melo */ 2389a2e27255SArnaldo Carvalho de Melo if (err != -EAGAIN) { 2390a2e27255SArnaldo Carvalho de Melo /* 2391a2e27255SArnaldo Carvalho de Melo * ... or if recvmsg returns an error after we 2392a2e27255SArnaldo Carvalho de Melo * received some datagrams, where we record the 2393a2e27255SArnaldo Carvalho de Melo * error to return on the next call or if the 2394a2e27255SArnaldo Carvalho de Melo * app asks about it using getsockopt(SO_ERROR). 2395a2e27255SArnaldo Carvalho de Melo */ 2396a2e27255SArnaldo Carvalho de Melo sock->sk->sk_err = -err; 2397a2e27255SArnaldo Carvalho de Melo } 239834b88a68SArnaldo Carvalho de Melo out_put: 239934b88a68SArnaldo Carvalho de Melo fput_light(sock->file, fput_needed); 2400a2e27255SArnaldo Carvalho de Melo 2401a2e27255SArnaldo Carvalho de Melo return datagrams; 2402a2e27255SArnaldo Carvalho de Melo } 2403a2e27255SArnaldo Carvalho de Melo 2404a2e27255SArnaldo Carvalho de Melo SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg, 2405a2e27255SArnaldo Carvalho de Melo unsigned int, vlen, unsigned int, flags, 2406a2e27255SArnaldo Carvalho de Melo struct timespec __user *, timeout) 2407a2e27255SArnaldo Carvalho de Melo { 2408a2e27255SArnaldo Carvalho de Melo int datagrams; 2409a2e27255SArnaldo Carvalho de Melo struct timespec timeout_sys; 2410a2e27255SArnaldo Carvalho de Melo 24111be374a0SAndy Lutomirski if (flags & MSG_CMSG_COMPAT) 24121be374a0SAndy Lutomirski return -EINVAL; 24131be374a0SAndy Lutomirski 2414a2e27255SArnaldo Carvalho de Melo if (!timeout) 2415a2e27255SArnaldo Carvalho de Melo return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL); 2416a2e27255SArnaldo Carvalho de Melo 2417a2e27255SArnaldo Carvalho de Melo if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys))) 2418a2e27255SArnaldo Carvalho de Melo return -EFAULT; 2419a2e27255SArnaldo Carvalho de Melo 2420a2e27255SArnaldo Carvalho de Melo datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys); 2421a2e27255SArnaldo Carvalho de Melo 2422a2e27255SArnaldo Carvalho de Melo if (datagrams > 0 && 2423a2e27255SArnaldo Carvalho de Melo copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys))) 2424a2e27255SArnaldo Carvalho de Melo datagrams = -EFAULT; 2425a2e27255SArnaldo Carvalho de Melo 2426a2e27255SArnaldo Carvalho de Melo return datagrams; 2427a2e27255SArnaldo Carvalho de Melo } 2428a2e27255SArnaldo Carvalho de Melo 2429a2e27255SArnaldo Carvalho de Melo #ifdef __ARCH_WANT_SYS_SOCKETCALL 24301da177e4SLinus Torvalds /* Argument list sizes for sys_socketcall */ 24311da177e4SLinus Torvalds #define AL(x) ((x) * sizeof(unsigned long)) 2432228e548eSAnton Blanchard static const unsigned char nargs[21] = { 243389bddce5SStephen Hemminger AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 24341da177e4SLinus Torvalds AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 2435aaca0bdcSUlrich Drepper AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 2436228e548eSAnton Blanchard AL(4), AL(5), AL(4) 243789bddce5SStephen Hemminger }; 243889bddce5SStephen Hemminger 24391da177e4SLinus Torvalds #undef AL 24401da177e4SLinus Torvalds 24411da177e4SLinus Torvalds /* 24421da177e4SLinus Torvalds * System call vectors. 24431da177e4SLinus Torvalds * 24441da177e4SLinus Torvalds * Argument checking cleaned up. Saved 20% in size. 24451da177e4SLinus Torvalds * This function doesn't need to set the kernel lock because 24461da177e4SLinus Torvalds * it is set by the callees. 24471da177e4SLinus Torvalds */ 24481da177e4SLinus Torvalds 24493e0fa65fSHeiko Carstens SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) 24501da177e4SLinus Torvalds { 24512950fa9dSChen Gang unsigned long a[AUDITSC_ARGS]; 24521da177e4SLinus Torvalds unsigned long a0, a1; 24531da177e4SLinus Torvalds int err; 245447379052SArjan van de Ven unsigned int len; 24551da177e4SLinus Torvalds 2456228e548eSAnton Blanchard if (call < 1 || call > SYS_SENDMMSG) 24571da177e4SLinus Torvalds return -EINVAL; 24581da177e4SLinus Torvalds 245947379052SArjan van de Ven len = nargs[call]; 246047379052SArjan van de Ven if (len > sizeof(a)) 246147379052SArjan van de Ven return -EINVAL; 246247379052SArjan van de Ven 24631da177e4SLinus Torvalds /* copy_from_user should be SMP safe. */ 246447379052SArjan van de Ven if (copy_from_user(a, args, len)) 24651da177e4SLinus Torvalds return -EFAULT; 24661da177e4SLinus Torvalds 24672950fa9dSChen Gang err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); 24682950fa9dSChen Gang if (err) 24692950fa9dSChen Gang return err; 24703ec3b2fbSDavid Woodhouse 24711da177e4SLinus Torvalds a0 = a[0]; 24721da177e4SLinus Torvalds a1 = a[1]; 24731da177e4SLinus Torvalds 247489bddce5SStephen Hemminger switch (call) { 24751da177e4SLinus Torvalds case SYS_SOCKET: 24769d6a15c3SDominik Brodowski err = __sys_socket(a0, a1, a[2]); 24771da177e4SLinus Torvalds break; 24781da177e4SLinus Torvalds case SYS_BIND: 2479a87d35d8SDominik Brodowski err = __sys_bind(a0, (struct sockaddr __user *)a1, a[2]); 24801da177e4SLinus Torvalds break; 24811da177e4SLinus Torvalds case SYS_CONNECT: 24821da177e4SLinus Torvalds err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); 24831da177e4SLinus Torvalds break; 24841da177e4SLinus Torvalds case SYS_LISTEN: 24851da177e4SLinus Torvalds err = sys_listen(a0, a1); 24861da177e4SLinus Torvalds break; 24871da177e4SLinus Torvalds case SYS_ACCEPT: 24884541e805SDominik Brodowski err = __sys_accept4(a0, (struct sockaddr __user *)a1, 2489aaca0bdcSUlrich Drepper (int __user *)a[2], 0); 24901da177e4SLinus Torvalds break; 24911da177e4SLinus Torvalds case SYS_GETSOCKNAME: 249289bddce5SStephen Hemminger err = 249389bddce5SStephen Hemminger sys_getsockname(a0, (struct sockaddr __user *)a1, 249489bddce5SStephen Hemminger (int __user *)a[2]); 24951da177e4SLinus Torvalds break; 24961da177e4SLinus Torvalds case SYS_GETPEERNAME: 249789bddce5SStephen Hemminger err = 249889bddce5SStephen Hemminger sys_getpeername(a0, (struct sockaddr __user *)a1, 249989bddce5SStephen Hemminger (int __user *)a[2]); 25001da177e4SLinus Torvalds break; 25011da177e4SLinus Torvalds case SYS_SOCKETPAIR: 25021da177e4SLinus Torvalds err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]); 25031da177e4SLinus Torvalds break; 25041da177e4SLinus Torvalds case SYS_SEND: 25051da177e4SLinus Torvalds err = sys_send(a0, (void __user *)a1, a[2], a[3]); 25061da177e4SLinus Torvalds break; 25071da177e4SLinus Torvalds case SYS_SENDTO: 2508211b634bSDominik Brodowski err = __sys_sendto(a0, (void __user *)a1, a[2], a[3], 25091da177e4SLinus Torvalds (struct sockaddr __user *)a[4], a[5]); 25101da177e4SLinus Torvalds break; 25111da177e4SLinus Torvalds case SYS_RECV: 25121da177e4SLinus Torvalds err = sys_recv(a0, (void __user *)a1, a[2], a[3]); 25131da177e4SLinus Torvalds break; 25141da177e4SLinus Torvalds case SYS_RECVFROM: 25157a09e1ebSDominik Brodowski err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3], 251689bddce5SStephen Hemminger (struct sockaddr __user *)a[4], 251789bddce5SStephen Hemminger (int __user *)a[5]); 25181da177e4SLinus Torvalds break; 25191da177e4SLinus Torvalds case SYS_SHUTDOWN: 25201da177e4SLinus Torvalds err = sys_shutdown(a0, a1); 25211da177e4SLinus Torvalds break; 25221da177e4SLinus Torvalds case SYS_SETSOCKOPT: 25231da177e4SLinus Torvalds err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); 25241da177e4SLinus Torvalds break; 25251da177e4SLinus Torvalds case SYS_GETSOCKOPT: 252689bddce5SStephen Hemminger err = 252789bddce5SStephen Hemminger sys_getsockopt(a0, a1, a[2], (char __user *)a[3], 252889bddce5SStephen Hemminger (int __user *)a[4]); 25291da177e4SLinus Torvalds break; 25301da177e4SLinus Torvalds case SYS_SENDMSG: 2531666547ffSAl Viro err = sys_sendmsg(a0, (struct user_msghdr __user *)a1, a[2]); 25321da177e4SLinus Torvalds break; 2533228e548eSAnton Blanchard case SYS_SENDMMSG: 2534228e548eSAnton Blanchard err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]); 2535228e548eSAnton Blanchard break; 25361da177e4SLinus Torvalds case SYS_RECVMSG: 2537666547ffSAl Viro err = sys_recvmsg(a0, (struct user_msghdr __user *)a1, a[2]); 25381da177e4SLinus Torvalds break; 2539a2e27255SArnaldo Carvalho de Melo case SYS_RECVMMSG: 2540a2e27255SArnaldo Carvalho de Melo err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3], 2541a2e27255SArnaldo Carvalho de Melo (struct timespec __user *)a[4]); 2542a2e27255SArnaldo Carvalho de Melo break; 2543de11defeSUlrich Drepper case SYS_ACCEPT4: 25444541e805SDominik Brodowski err = __sys_accept4(a0, (struct sockaddr __user *)a1, 2545de11defeSUlrich Drepper (int __user *)a[2], a[3]); 2546aaca0bdcSUlrich Drepper break; 25471da177e4SLinus Torvalds default: 25481da177e4SLinus Torvalds err = -EINVAL; 25491da177e4SLinus Torvalds break; 25501da177e4SLinus Torvalds } 25511da177e4SLinus Torvalds return err; 25521da177e4SLinus Torvalds } 25531da177e4SLinus Torvalds 25541da177e4SLinus Torvalds #endif /* __ARCH_WANT_SYS_SOCKETCALL */ 25551da177e4SLinus Torvalds 255655737fdaSStephen Hemminger /** 255755737fdaSStephen Hemminger * sock_register - add a socket protocol handler 255855737fdaSStephen Hemminger * @ops: description of protocol 255955737fdaSStephen Hemminger * 25601da177e4SLinus Torvalds * This function is called by a protocol handler that wants to 25611da177e4SLinus Torvalds * advertise its address family, and have it linked into the 2562e793c0f7SMasanari Iida * socket interface. The value ops->family corresponds to the 256355737fdaSStephen Hemminger * socket system call protocol family. 25641da177e4SLinus Torvalds */ 2565f0fd27d4SStephen Hemminger int sock_register(const struct net_proto_family *ops) 25661da177e4SLinus Torvalds { 25671da177e4SLinus Torvalds int err; 25681da177e4SLinus Torvalds 25691da177e4SLinus Torvalds if (ops->family >= NPROTO) { 25703410f22eSYang Yingliang pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); 25711da177e4SLinus Torvalds return -ENOBUFS; 25721da177e4SLinus Torvalds } 257355737fdaSStephen Hemminger 257455737fdaSStephen Hemminger spin_lock(&net_family_lock); 2575190683a9SEric Dumazet if (rcu_dereference_protected(net_families[ops->family], 2576190683a9SEric Dumazet lockdep_is_held(&net_family_lock))) 25771da177e4SLinus Torvalds err = -EEXIST; 257855737fdaSStephen Hemminger else { 2579cf778b00SEric Dumazet rcu_assign_pointer(net_families[ops->family], ops); 25801da177e4SLinus Torvalds err = 0; 25811da177e4SLinus Torvalds } 258255737fdaSStephen Hemminger spin_unlock(&net_family_lock); 258355737fdaSStephen Hemminger 25843410f22eSYang Yingliang pr_info("NET: Registered protocol family %d\n", ops->family); 25851da177e4SLinus Torvalds return err; 25861da177e4SLinus Torvalds } 2587c6d409cfSEric Dumazet EXPORT_SYMBOL(sock_register); 25881da177e4SLinus Torvalds 258955737fdaSStephen Hemminger /** 259055737fdaSStephen Hemminger * sock_unregister - remove a protocol handler 259155737fdaSStephen Hemminger * @family: protocol family to remove 259255737fdaSStephen Hemminger * 25931da177e4SLinus Torvalds * This function is called by a protocol handler that wants to 25941da177e4SLinus Torvalds * remove its address family, and have it unlinked from the 259555737fdaSStephen Hemminger * new socket creation. 259655737fdaSStephen Hemminger * 259755737fdaSStephen Hemminger * If protocol handler is a module, then it can use module reference 259855737fdaSStephen Hemminger * counts to protect against new references. If protocol handler is not 259955737fdaSStephen Hemminger * a module then it needs to provide its own protection in 260055737fdaSStephen Hemminger * the ops->create routine. 26011da177e4SLinus Torvalds */ 2602f0fd27d4SStephen Hemminger void sock_unregister(int family) 26031da177e4SLinus Torvalds { 2604f0fd27d4SStephen Hemminger BUG_ON(family < 0 || family >= NPROTO); 26051da177e4SLinus Torvalds 260655737fdaSStephen Hemminger spin_lock(&net_family_lock); 2607a9b3cd7fSStephen Hemminger RCU_INIT_POINTER(net_families[family], NULL); 260855737fdaSStephen Hemminger spin_unlock(&net_family_lock); 260955737fdaSStephen Hemminger 261055737fdaSStephen Hemminger synchronize_rcu(); 261155737fdaSStephen Hemminger 26123410f22eSYang Yingliang pr_info("NET: Unregistered protocol family %d\n", family); 26131da177e4SLinus Torvalds } 2614c6d409cfSEric Dumazet EXPORT_SYMBOL(sock_unregister); 26151da177e4SLinus Torvalds 261677d76ea3SAndi Kleen static int __init sock_init(void) 26171da177e4SLinus Torvalds { 2618b3e19d92SNick Piggin int err; 26192ca794e5SEric W. Biederman /* 26202ca794e5SEric W. Biederman * Initialize the network sysctl infrastructure. 26212ca794e5SEric W. Biederman */ 26222ca794e5SEric W. Biederman err = net_sysctl_init(); 26232ca794e5SEric W. Biederman if (err) 26242ca794e5SEric W. Biederman goto out; 2625b3e19d92SNick Piggin 26261da177e4SLinus Torvalds /* 26271da177e4SLinus Torvalds * Initialize skbuff SLAB cache 26281da177e4SLinus Torvalds */ 26291da177e4SLinus Torvalds skb_init(); 26301da177e4SLinus Torvalds 26311da177e4SLinus Torvalds /* 26321da177e4SLinus Torvalds * Initialize the protocols module. 26331da177e4SLinus Torvalds */ 26341da177e4SLinus Torvalds 26351da177e4SLinus Torvalds init_inodecache(); 2636b3e19d92SNick Piggin 2637b3e19d92SNick Piggin err = register_filesystem(&sock_fs_type); 2638b3e19d92SNick Piggin if (err) 2639b3e19d92SNick Piggin goto out_fs; 26401da177e4SLinus Torvalds sock_mnt = kern_mount(&sock_fs_type); 2641b3e19d92SNick Piggin if (IS_ERR(sock_mnt)) { 2642b3e19d92SNick Piggin err = PTR_ERR(sock_mnt); 2643b3e19d92SNick Piggin goto out_mount; 2644b3e19d92SNick Piggin } 264577d76ea3SAndi Kleen 264677d76ea3SAndi Kleen /* The real protocol initialization is performed in later initcalls. 26471da177e4SLinus Torvalds */ 26481da177e4SLinus Torvalds 26491da177e4SLinus Torvalds #ifdef CONFIG_NETFILTER 26506d11cfdbSPablo Neira Ayuso err = netfilter_init(); 26516d11cfdbSPablo Neira Ayuso if (err) 26526d11cfdbSPablo Neira Ayuso goto out; 26531da177e4SLinus Torvalds #endif 2654cbeb321aSDavid S. Miller 2655408eccceSDaniel Borkmann ptp_classifier_init(); 2656c1f19b51SRichard Cochran 2657b3e19d92SNick Piggin out: 2658b3e19d92SNick Piggin return err; 2659b3e19d92SNick Piggin 2660b3e19d92SNick Piggin out_mount: 2661b3e19d92SNick Piggin unregister_filesystem(&sock_fs_type); 2662b3e19d92SNick Piggin out_fs: 2663b3e19d92SNick Piggin goto out; 26641da177e4SLinus Torvalds } 26651da177e4SLinus Torvalds 266677d76ea3SAndi Kleen core_initcall(sock_init); /* early initcall */ 266777d76ea3SAndi Kleen 26681da177e4SLinus Torvalds #ifdef CONFIG_PROC_FS 26691da177e4SLinus Torvalds void socket_seq_show(struct seq_file *seq) 26701da177e4SLinus Torvalds { 2671648845abSTonghao Zhang seq_printf(seq, "sockets: used %d\n", 2672648845abSTonghao Zhang sock_inuse_get(seq->private)); 26731da177e4SLinus Torvalds } 26741da177e4SLinus Torvalds #endif /* CONFIG_PROC_FS */ 26751da177e4SLinus Torvalds 267689bbfc95SShaun Pereira #ifdef CONFIG_COMPAT 26776b96018bSArnd Bergmann static int do_siocgstamp(struct net *net, struct socket *sock, 2678644595f8SH. Peter Anvin unsigned int cmd, void __user *up) 26797a229387SArnd Bergmann { 26807a229387SArnd Bergmann mm_segment_t old_fs = get_fs(); 26817a229387SArnd Bergmann struct timeval ktv; 26827a229387SArnd Bergmann int err; 26837a229387SArnd Bergmann 26847a229387SArnd Bergmann set_fs(KERNEL_DS); 26856b96018bSArnd Bergmann err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv); 26867a229387SArnd Bergmann set_fs(old_fs); 2687644595f8SH. Peter Anvin if (!err) 2688ed6fe9d6SMikulas Patocka err = compat_put_timeval(&ktv, up); 2689644595f8SH. Peter Anvin 26907a229387SArnd Bergmann return err; 26917a229387SArnd Bergmann } 26927a229387SArnd Bergmann 26936b96018bSArnd Bergmann static int do_siocgstampns(struct net *net, struct socket *sock, 2694644595f8SH. Peter Anvin unsigned int cmd, void __user *up) 26957a229387SArnd Bergmann { 26967a229387SArnd Bergmann mm_segment_t old_fs = get_fs(); 26977a229387SArnd Bergmann struct timespec kts; 26987a229387SArnd Bergmann int err; 26997a229387SArnd Bergmann 27007a229387SArnd Bergmann set_fs(KERNEL_DS); 27016b96018bSArnd Bergmann err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts); 27027a229387SArnd Bergmann set_fs(old_fs); 2703644595f8SH. Peter Anvin if (!err) 2704ed6fe9d6SMikulas Patocka err = compat_put_timespec(&kts, up); 2705644595f8SH. Peter Anvin 27067a229387SArnd Bergmann return err; 27077a229387SArnd Bergmann } 27087a229387SArnd Bergmann 270936fd633eSAl Viro static int compat_dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32) 27107a229387SArnd Bergmann { 27116b96018bSArnd Bergmann struct compat_ifconf ifc32; 27127a229387SArnd Bergmann struct ifconf ifc; 27137a229387SArnd Bergmann int err; 27147a229387SArnd Bergmann 27156b96018bSArnd Bergmann if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf))) 27167a229387SArnd Bergmann return -EFAULT; 27177a229387SArnd Bergmann 271836fd633eSAl Viro ifc.ifc_len = ifc32.ifc_len; 271936fd633eSAl Viro ifc.ifc_req = compat_ptr(ifc32.ifcbuf); 27207a229387SArnd Bergmann 272136fd633eSAl Viro rtnl_lock(); 272236fd633eSAl Viro err = dev_ifconf(net, &ifc, sizeof(struct compat_ifreq)); 272336fd633eSAl Viro rtnl_unlock(); 27247a229387SArnd Bergmann if (err) 27257a229387SArnd Bergmann return err; 27267a229387SArnd Bergmann 272736fd633eSAl Viro ifc32.ifc_len = ifc.ifc_len; 27286b96018bSArnd Bergmann if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf))) 27297a229387SArnd Bergmann return -EFAULT; 27307a229387SArnd Bergmann 27317a229387SArnd Bergmann return 0; 27327a229387SArnd Bergmann } 27337a229387SArnd Bergmann 27346b96018bSArnd Bergmann static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32) 27357a229387SArnd Bergmann { 27363a7da39dSBen Hutchings struct compat_ethtool_rxnfc __user *compat_rxnfc; 27373a7da39dSBen Hutchings bool convert_in = false, convert_out = false; 273844c02a2cSAl Viro size_t buf_size = 0; 273944c02a2cSAl Viro struct ethtool_rxnfc __user *rxnfc = NULL; 274044c02a2cSAl Viro struct ifreq ifr; 27413a7da39dSBen Hutchings u32 rule_cnt = 0, actual_rule_cnt; 27423a7da39dSBen Hutchings u32 ethcmd; 27437a229387SArnd Bergmann u32 data; 27443a7da39dSBen Hutchings int ret; 27457a229387SArnd Bergmann 27467a229387SArnd Bergmann if (get_user(data, &ifr32->ifr_ifru.ifru_data)) 27477a229387SArnd Bergmann return -EFAULT; 27487a229387SArnd Bergmann 27493a7da39dSBen Hutchings compat_rxnfc = compat_ptr(data); 27503a7da39dSBen Hutchings 27513a7da39dSBen Hutchings if (get_user(ethcmd, &compat_rxnfc->cmd)) 27527a229387SArnd Bergmann return -EFAULT; 27537a229387SArnd Bergmann 27543a7da39dSBen Hutchings /* Most ethtool structures are defined without padding. 27553a7da39dSBen Hutchings * Unfortunately struct ethtool_rxnfc is an exception. 27563a7da39dSBen Hutchings */ 27573a7da39dSBen Hutchings switch (ethcmd) { 27583a7da39dSBen Hutchings default: 27593a7da39dSBen Hutchings break; 27603a7da39dSBen Hutchings case ETHTOOL_GRXCLSRLALL: 27613a7da39dSBen Hutchings /* Buffer size is variable */ 27623a7da39dSBen Hutchings if (get_user(rule_cnt, &compat_rxnfc->rule_cnt)) 27633a7da39dSBen Hutchings return -EFAULT; 27643a7da39dSBen Hutchings if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32)) 27653a7da39dSBen Hutchings return -ENOMEM; 27663a7da39dSBen Hutchings buf_size += rule_cnt * sizeof(u32); 27673a7da39dSBen Hutchings /* fall through */ 27683a7da39dSBen Hutchings case ETHTOOL_GRXRINGS: 27693a7da39dSBen Hutchings case ETHTOOL_GRXCLSRLCNT: 27703a7da39dSBen Hutchings case ETHTOOL_GRXCLSRULE: 277155664f32SBen Hutchings case ETHTOOL_SRXCLSRLINS: 27723a7da39dSBen Hutchings convert_out = true; 27733a7da39dSBen Hutchings /* fall through */ 27743a7da39dSBen Hutchings case ETHTOOL_SRXCLSRLDEL: 27753a7da39dSBen Hutchings buf_size += sizeof(struct ethtool_rxnfc); 27763a7da39dSBen Hutchings convert_in = true; 277744c02a2cSAl Viro rxnfc = compat_alloc_user_space(buf_size); 27783a7da39dSBen Hutchings break; 27793a7da39dSBen Hutchings } 27803a7da39dSBen Hutchings 278144c02a2cSAl Viro if (copy_from_user(&ifr.ifr_name, &ifr32->ifr_name, IFNAMSIZ)) 27823a7da39dSBen Hutchings return -EFAULT; 27833a7da39dSBen Hutchings 278444c02a2cSAl Viro ifr.ifr_data = convert_in ? rxnfc : (void __user *)compat_rxnfc; 27853a7da39dSBen Hutchings 27863a7da39dSBen Hutchings if (convert_in) { 2787127fe533SAlexander Duyck /* We expect there to be holes between fs.m_ext and 27883a7da39dSBen Hutchings * fs.ring_cookie and at the end of fs, but nowhere else. 27893a7da39dSBen Hutchings */ 2790127fe533SAlexander Duyck BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) + 2791127fe533SAlexander Duyck sizeof(compat_rxnfc->fs.m_ext) != 2792127fe533SAlexander Duyck offsetof(struct ethtool_rxnfc, fs.m_ext) + 2793127fe533SAlexander Duyck sizeof(rxnfc->fs.m_ext)); 27943a7da39dSBen Hutchings BUILD_BUG_ON( 27953a7da39dSBen Hutchings offsetof(struct compat_ethtool_rxnfc, fs.location) - 27963a7da39dSBen Hutchings offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) != 27973a7da39dSBen Hutchings offsetof(struct ethtool_rxnfc, fs.location) - 27983a7da39dSBen Hutchings offsetof(struct ethtool_rxnfc, fs.ring_cookie)); 27993a7da39dSBen Hutchings 28003a7da39dSBen Hutchings if (copy_in_user(rxnfc, compat_rxnfc, 2801954b1244SStephen Hemminger (void __user *)(&rxnfc->fs.m_ext + 1) - 2802954b1244SStephen Hemminger (void __user *)rxnfc) || 28033a7da39dSBen Hutchings copy_in_user(&rxnfc->fs.ring_cookie, 28043a7da39dSBen Hutchings &compat_rxnfc->fs.ring_cookie, 2805954b1244SStephen Hemminger (void __user *)(&rxnfc->fs.location + 1) - 2806954b1244SStephen Hemminger (void __user *)&rxnfc->fs.ring_cookie) || 28073a7da39dSBen Hutchings copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt, 28083a7da39dSBen Hutchings sizeof(rxnfc->rule_cnt))) 28093a7da39dSBen Hutchings return -EFAULT; 28103a7da39dSBen Hutchings } 28113a7da39dSBen Hutchings 281244c02a2cSAl Viro ret = dev_ioctl(net, SIOCETHTOOL, &ifr, NULL); 28133a7da39dSBen Hutchings if (ret) 28143a7da39dSBen Hutchings return ret; 28153a7da39dSBen Hutchings 28163a7da39dSBen Hutchings if (convert_out) { 28173a7da39dSBen Hutchings if (copy_in_user(compat_rxnfc, rxnfc, 2818954b1244SStephen Hemminger (const void __user *)(&rxnfc->fs.m_ext + 1) - 2819954b1244SStephen Hemminger (const void __user *)rxnfc) || 28203a7da39dSBen Hutchings copy_in_user(&compat_rxnfc->fs.ring_cookie, 28213a7da39dSBen Hutchings &rxnfc->fs.ring_cookie, 2822954b1244SStephen Hemminger (const void __user *)(&rxnfc->fs.location + 1) - 2823954b1244SStephen Hemminger (const void __user *)&rxnfc->fs.ring_cookie) || 28243a7da39dSBen Hutchings copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt, 28253a7da39dSBen Hutchings sizeof(rxnfc->rule_cnt))) 28263a7da39dSBen Hutchings return -EFAULT; 28273a7da39dSBen Hutchings 28283a7da39dSBen Hutchings if (ethcmd == ETHTOOL_GRXCLSRLALL) { 28293a7da39dSBen Hutchings /* As an optimisation, we only copy the actual 28303a7da39dSBen Hutchings * number of rules that the underlying 28313a7da39dSBen Hutchings * function returned. Since Mallory might 28323a7da39dSBen Hutchings * change the rule count in user memory, we 28333a7da39dSBen Hutchings * check that it is less than the rule count 28343a7da39dSBen Hutchings * originally given (as the user buffer size), 28353a7da39dSBen Hutchings * which has been range-checked. 28363a7da39dSBen Hutchings */ 28373a7da39dSBen Hutchings if (get_user(actual_rule_cnt, &rxnfc->rule_cnt)) 28383a7da39dSBen Hutchings return -EFAULT; 28393a7da39dSBen Hutchings if (actual_rule_cnt < rule_cnt) 28403a7da39dSBen Hutchings rule_cnt = actual_rule_cnt; 28413a7da39dSBen Hutchings if (copy_in_user(&compat_rxnfc->rule_locs[0], 28423a7da39dSBen Hutchings &rxnfc->rule_locs[0], 28433a7da39dSBen Hutchings rule_cnt * sizeof(u32))) 28443a7da39dSBen Hutchings return -EFAULT; 28453a7da39dSBen Hutchings } 28463a7da39dSBen Hutchings } 28473a7da39dSBen Hutchings 28483a7da39dSBen Hutchings return 0; 28497a229387SArnd Bergmann } 28507a229387SArnd Bergmann 28517a50a240SArnd Bergmann static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32) 28527a50a240SArnd Bergmann { 28537a50a240SArnd Bergmann compat_uptr_t uptr32; 285444c02a2cSAl Viro struct ifreq ifr; 285544c02a2cSAl Viro void __user *saved; 285644c02a2cSAl Viro int err; 28577a50a240SArnd Bergmann 285844c02a2cSAl Viro if (copy_from_user(&ifr, uifr32, sizeof(struct compat_ifreq))) 28597a50a240SArnd Bergmann return -EFAULT; 28607a50a240SArnd Bergmann 28617a50a240SArnd Bergmann if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu)) 28627a50a240SArnd Bergmann return -EFAULT; 28637a50a240SArnd Bergmann 286444c02a2cSAl Viro saved = ifr.ifr_settings.ifs_ifsu.raw_hdlc; 286544c02a2cSAl Viro ifr.ifr_settings.ifs_ifsu.raw_hdlc = compat_ptr(uptr32); 28667a50a240SArnd Bergmann 286744c02a2cSAl Viro err = dev_ioctl(net, SIOCWANDEV, &ifr, NULL); 286844c02a2cSAl Viro if (!err) { 286944c02a2cSAl Viro ifr.ifr_settings.ifs_ifsu.raw_hdlc = saved; 287044c02a2cSAl Viro if (copy_to_user(uifr32, &ifr, sizeof(struct compat_ifreq))) 287144c02a2cSAl Viro err = -EFAULT; 28727a50a240SArnd Bergmann } 28737a229387SArnd Bergmann return err; 28747a229387SArnd Bergmann } 28757a229387SArnd Bergmann 2876590d4693SBen Hutchings /* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */ 2877590d4693SBen Hutchings static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd, 28786b96018bSArnd Bergmann struct compat_ifreq __user *u_ifreq32) 28797a229387SArnd Bergmann { 288044c02a2cSAl Viro struct ifreq ifreq; 28817a229387SArnd Bergmann u32 data32; 28827a229387SArnd Bergmann 288344c02a2cSAl Viro if (copy_from_user(ifreq.ifr_name, u_ifreq32->ifr_name, IFNAMSIZ)) 28847a229387SArnd Bergmann return -EFAULT; 288544c02a2cSAl Viro if (get_user(data32, &u_ifreq32->ifr_data)) 28867a229387SArnd Bergmann return -EFAULT; 288744c02a2cSAl Viro ifreq.ifr_data = compat_ptr(data32); 28887a229387SArnd Bergmann 288944c02a2cSAl Viro return dev_ioctl(net, cmd, &ifreq, NULL); 2890a2116ed2SArnd Bergmann } 2891a2116ed2SArnd Bergmann 2892a2116ed2SArnd Bergmann static int compat_sioc_ifmap(struct net *net, unsigned int cmd, 2893a2116ed2SArnd Bergmann struct compat_ifreq __user *uifr32) 2894a2116ed2SArnd Bergmann { 2895a2116ed2SArnd Bergmann struct ifreq ifr; 2896a2116ed2SArnd Bergmann struct compat_ifmap __user *uifmap32; 2897a2116ed2SArnd Bergmann int err; 2898a2116ed2SArnd Bergmann 2899a2116ed2SArnd Bergmann uifmap32 = &uifr32->ifr_ifru.ifru_map; 2900a2116ed2SArnd Bergmann err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name)); 29013ddc5b46SMathieu Desnoyers err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); 29023ddc5b46SMathieu Desnoyers err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); 29033ddc5b46SMathieu Desnoyers err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); 29043ddc5b46SMathieu Desnoyers err |= get_user(ifr.ifr_map.irq, &uifmap32->irq); 29053ddc5b46SMathieu Desnoyers err |= get_user(ifr.ifr_map.dma, &uifmap32->dma); 29063ddc5b46SMathieu Desnoyers err |= get_user(ifr.ifr_map.port, &uifmap32->port); 2907a2116ed2SArnd Bergmann if (err) 2908a2116ed2SArnd Bergmann return -EFAULT; 2909a2116ed2SArnd Bergmann 291044c02a2cSAl Viro err = dev_ioctl(net, cmd, &ifr, NULL); 2911a2116ed2SArnd Bergmann 2912a2116ed2SArnd Bergmann if (cmd == SIOCGIFMAP && !err) { 29137a229387SArnd Bergmann err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name)); 29143ddc5b46SMathieu Desnoyers err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); 29153ddc5b46SMathieu Desnoyers err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); 29163ddc5b46SMathieu Desnoyers err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); 29173ddc5b46SMathieu Desnoyers err |= put_user(ifr.ifr_map.irq, &uifmap32->irq); 29183ddc5b46SMathieu Desnoyers err |= put_user(ifr.ifr_map.dma, &uifmap32->dma); 29193ddc5b46SMathieu Desnoyers err |= put_user(ifr.ifr_map.port, &uifmap32->port); 29207a229387SArnd Bergmann if (err) 29217a229387SArnd Bergmann err = -EFAULT; 29227a229387SArnd Bergmann } 29237a229387SArnd Bergmann return err; 29247a229387SArnd Bergmann } 29257a229387SArnd Bergmann 29267a229387SArnd Bergmann struct rtentry32 { 29277a229387SArnd Bergmann u32 rt_pad1; 29287a229387SArnd Bergmann struct sockaddr rt_dst; /* target address */ 29297a229387SArnd Bergmann struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */ 29307a229387SArnd Bergmann struct sockaddr rt_genmask; /* target network mask (IP) */ 29317a229387SArnd Bergmann unsigned short rt_flags; 29327a229387SArnd Bergmann short rt_pad2; 29337a229387SArnd Bergmann u32 rt_pad3; 29347a229387SArnd Bergmann unsigned char rt_tos; 29357a229387SArnd Bergmann unsigned char rt_class; 29367a229387SArnd Bergmann short rt_pad4; 29377a229387SArnd Bergmann short rt_metric; /* +1 for binary compatibility! */ 29387a229387SArnd Bergmann /* char * */ u32 rt_dev; /* forcing the device at add */ 29397a229387SArnd Bergmann u32 rt_mtu; /* per route MTU/Window */ 29407a229387SArnd Bergmann u32 rt_window; /* Window clamping */ 29417a229387SArnd Bergmann unsigned short rt_irtt; /* Initial RTT */ 29427a229387SArnd Bergmann }; 29437a229387SArnd Bergmann 29447a229387SArnd Bergmann struct in6_rtmsg32 { 29457a229387SArnd Bergmann struct in6_addr rtmsg_dst; 29467a229387SArnd Bergmann struct in6_addr rtmsg_src; 29477a229387SArnd Bergmann struct in6_addr rtmsg_gateway; 29487a229387SArnd Bergmann u32 rtmsg_type; 29497a229387SArnd Bergmann u16 rtmsg_dst_len; 29507a229387SArnd Bergmann u16 rtmsg_src_len; 29517a229387SArnd Bergmann u32 rtmsg_metric; 29527a229387SArnd Bergmann u32 rtmsg_info; 29537a229387SArnd Bergmann u32 rtmsg_flags; 29547a229387SArnd Bergmann s32 rtmsg_ifindex; 29557a229387SArnd Bergmann }; 29567a229387SArnd Bergmann 29576b96018bSArnd Bergmann static int routing_ioctl(struct net *net, struct socket *sock, 29586b96018bSArnd Bergmann unsigned int cmd, void __user *argp) 29597a229387SArnd Bergmann { 29607a229387SArnd Bergmann int ret; 29617a229387SArnd Bergmann void *r = NULL; 29627a229387SArnd Bergmann struct in6_rtmsg r6; 29637a229387SArnd Bergmann struct rtentry r4; 29647a229387SArnd Bergmann char devname[16]; 29657a229387SArnd Bergmann u32 rtdev; 29667a229387SArnd Bergmann mm_segment_t old_fs = get_fs(); 29677a229387SArnd Bergmann 29686b96018bSArnd Bergmann if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */ 29696b96018bSArnd Bergmann struct in6_rtmsg32 __user *ur6 = argp; 29707a229387SArnd Bergmann ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst), 29717a229387SArnd Bergmann 3 * sizeof(struct in6_addr)); 29723ddc5b46SMathieu Desnoyers ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type)); 29733ddc5b46SMathieu Desnoyers ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len)); 29743ddc5b46SMathieu Desnoyers ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len)); 29753ddc5b46SMathieu Desnoyers ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric)); 29763ddc5b46SMathieu Desnoyers ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info)); 29773ddc5b46SMathieu Desnoyers ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags)); 29783ddc5b46SMathieu Desnoyers ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex)); 29797a229387SArnd Bergmann 29807a229387SArnd Bergmann r = (void *) &r6; 29817a229387SArnd Bergmann } else { /* ipv4 */ 29826b96018bSArnd Bergmann struct rtentry32 __user *ur4 = argp; 29837a229387SArnd Bergmann ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst), 29847a229387SArnd Bergmann 3 * sizeof(struct sockaddr)); 29853ddc5b46SMathieu Desnoyers ret |= get_user(r4.rt_flags, &(ur4->rt_flags)); 29863ddc5b46SMathieu Desnoyers ret |= get_user(r4.rt_metric, &(ur4->rt_metric)); 29873ddc5b46SMathieu Desnoyers ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu)); 29883ddc5b46SMathieu Desnoyers ret |= get_user(r4.rt_window, &(ur4->rt_window)); 29893ddc5b46SMathieu Desnoyers ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt)); 29903ddc5b46SMathieu Desnoyers ret |= get_user(rtdev, &(ur4->rt_dev)); 29917a229387SArnd Bergmann if (rtdev) { 29927a229387SArnd Bergmann ret |= copy_from_user(devname, compat_ptr(rtdev), 15); 2993c3f52ae6Sstephen hemminger r4.rt_dev = (char __user __force *)devname; 2994c3f52ae6Sstephen hemminger devname[15] = 0; 29957a229387SArnd Bergmann } else 29967a229387SArnd Bergmann r4.rt_dev = NULL; 29977a229387SArnd Bergmann 29987a229387SArnd Bergmann r = (void *) &r4; 29997a229387SArnd Bergmann } 30007a229387SArnd Bergmann 30017a229387SArnd Bergmann if (ret) { 30027a229387SArnd Bergmann ret = -EFAULT; 30037a229387SArnd Bergmann goto out; 30047a229387SArnd Bergmann } 30057a229387SArnd Bergmann 30067a229387SArnd Bergmann set_fs(KERNEL_DS); 30076b96018bSArnd Bergmann ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r); 30087a229387SArnd Bergmann set_fs(old_fs); 30097a229387SArnd Bergmann 30107a229387SArnd Bergmann out: 30117a229387SArnd Bergmann return ret; 30127a229387SArnd Bergmann } 30137a229387SArnd Bergmann 30147a229387SArnd Bergmann /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE 30157a229387SArnd Bergmann * for some operations; this forces use of the newer bridge-utils that 301625985edcSLucas De Marchi * use compatible ioctls 30177a229387SArnd Bergmann */ 30186b96018bSArnd Bergmann static int old_bridge_ioctl(compat_ulong_t __user *argp) 30197a229387SArnd Bergmann { 30206b96018bSArnd Bergmann compat_ulong_t tmp; 30217a229387SArnd Bergmann 30226b96018bSArnd Bergmann if (get_user(tmp, argp)) 30237a229387SArnd Bergmann return -EFAULT; 30247a229387SArnd Bergmann if (tmp == BRCTL_GET_VERSION) 30257a229387SArnd Bergmann return BRCTL_VERSION + 1; 30267a229387SArnd Bergmann return -EINVAL; 30277a229387SArnd Bergmann } 30287a229387SArnd Bergmann 30296b96018bSArnd Bergmann static int compat_sock_ioctl_trans(struct file *file, struct socket *sock, 30306b96018bSArnd Bergmann unsigned int cmd, unsigned long arg) 30316b96018bSArnd Bergmann { 30326b96018bSArnd Bergmann void __user *argp = compat_ptr(arg); 30336b96018bSArnd Bergmann struct sock *sk = sock->sk; 30346b96018bSArnd Bergmann struct net *net = sock_net(sk); 30357a229387SArnd Bergmann 30366b96018bSArnd Bergmann if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) 3037590d4693SBen Hutchings return compat_ifr_data_ioctl(net, cmd, argp); 30387a229387SArnd Bergmann 30396b96018bSArnd Bergmann switch (cmd) { 30406b96018bSArnd Bergmann case SIOCSIFBR: 30416b96018bSArnd Bergmann case SIOCGIFBR: 30426b96018bSArnd Bergmann return old_bridge_ioctl(argp); 30436b96018bSArnd Bergmann case SIOCGIFCONF: 304436fd633eSAl Viro return compat_dev_ifconf(net, argp); 30456b96018bSArnd Bergmann case SIOCETHTOOL: 30466b96018bSArnd Bergmann return ethtool_ioctl(net, argp); 30477a50a240SArnd Bergmann case SIOCWANDEV: 30487a50a240SArnd Bergmann return compat_siocwandev(net, argp); 3049a2116ed2SArnd Bergmann case SIOCGIFMAP: 3050a2116ed2SArnd Bergmann case SIOCSIFMAP: 3051a2116ed2SArnd Bergmann return compat_sioc_ifmap(net, cmd, argp); 30526b96018bSArnd Bergmann case SIOCADDRT: 30536b96018bSArnd Bergmann case SIOCDELRT: 30546b96018bSArnd Bergmann return routing_ioctl(net, sock, cmd, argp); 30556b96018bSArnd Bergmann case SIOCGSTAMP: 30566b96018bSArnd Bergmann return do_siocgstamp(net, sock, cmd, argp); 30576b96018bSArnd Bergmann case SIOCGSTAMPNS: 30586b96018bSArnd Bergmann return do_siocgstampns(net, sock, cmd, argp); 3059590d4693SBen Hutchings case SIOCBONDSLAVEINFOQUERY: 3060590d4693SBen Hutchings case SIOCBONDINFOQUERY: 3061a2116ed2SArnd Bergmann case SIOCSHWTSTAMP: 3062fd468c74SBen Hutchings case SIOCGHWTSTAMP: 3063590d4693SBen Hutchings return compat_ifr_data_ioctl(net, cmd, argp); 30647a229387SArnd Bergmann 30656b96018bSArnd Bergmann case FIOSETOWN: 30666b96018bSArnd Bergmann case SIOCSPGRP: 30676b96018bSArnd Bergmann case FIOGETOWN: 30686b96018bSArnd Bergmann case SIOCGPGRP: 30696b96018bSArnd Bergmann case SIOCBRADDBR: 30706b96018bSArnd Bergmann case SIOCBRDELBR: 30716b96018bSArnd Bergmann case SIOCGIFVLAN: 30726b96018bSArnd Bergmann case SIOCSIFVLAN: 30736b96018bSArnd Bergmann case SIOCADDDLCI: 30746b96018bSArnd Bergmann case SIOCDELDLCI: 3075c62cce2cSAndrey Vagin case SIOCGSKNS: 30766b96018bSArnd Bergmann return sock_ioctl(file, cmd, arg); 30776b96018bSArnd Bergmann 30786b96018bSArnd Bergmann case SIOCGIFFLAGS: 30796b96018bSArnd Bergmann case SIOCSIFFLAGS: 30806b96018bSArnd Bergmann case SIOCGIFMETRIC: 30816b96018bSArnd Bergmann case SIOCSIFMETRIC: 30826b96018bSArnd Bergmann case SIOCGIFMTU: 30836b96018bSArnd Bergmann case SIOCSIFMTU: 30846b96018bSArnd Bergmann case SIOCGIFMEM: 30856b96018bSArnd Bergmann case SIOCSIFMEM: 30866b96018bSArnd Bergmann case SIOCGIFHWADDR: 30876b96018bSArnd Bergmann case SIOCSIFHWADDR: 30886b96018bSArnd Bergmann case SIOCADDMULTI: 30896b96018bSArnd Bergmann case SIOCDELMULTI: 30906b96018bSArnd Bergmann case SIOCGIFINDEX: 30916b96018bSArnd Bergmann case SIOCGIFADDR: 30926b96018bSArnd Bergmann case SIOCSIFADDR: 30936b96018bSArnd Bergmann case SIOCSIFHWBROADCAST: 30946b96018bSArnd Bergmann case SIOCDIFADDR: 30956b96018bSArnd Bergmann case SIOCGIFBRDADDR: 30966b96018bSArnd Bergmann case SIOCSIFBRDADDR: 30976b96018bSArnd Bergmann case SIOCGIFDSTADDR: 30986b96018bSArnd Bergmann case SIOCSIFDSTADDR: 30996b96018bSArnd Bergmann case SIOCGIFNETMASK: 31006b96018bSArnd Bergmann case SIOCSIFNETMASK: 31016b96018bSArnd Bergmann case SIOCSIFPFLAGS: 31026b96018bSArnd Bergmann case SIOCGIFPFLAGS: 31036b96018bSArnd Bergmann case SIOCGIFTXQLEN: 31046b96018bSArnd Bergmann case SIOCSIFTXQLEN: 31056b96018bSArnd Bergmann case SIOCBRADDIF: 31066b96018bSArnd Bergmann case SIOCBRDELIF: 31079177efd3SArnd Bergmann case SIOCSIFNAME: 31089177efd3SArnd Bergmann case SIOCGMIIPHY: 31099177efd3SArnd Bergmann case SIOCGMIIREG: 31109177efd3SArnd Bergmann case SIOCSMIIREG: 31116b96018bSArnd Bergmann case SIOCSARP: 31126b96018bSArnd Bergmann case SIOCGARP: 31136b96018bSArnd Bergmann case SIOCDARP: 31146b96018bSArnd Bergmann case SIOCATMARK: 3115f92d4fc9SAl Viro case SIOCBONDENSLAVE: 3116f92d4fc9SAl Viro case SIOCBONDRELEASE: 3117f92d4fc9SAl Viro case SIOCBONDSETHWADDR: 3118f92d4fc9SAl Viro case SIOCBONDCHANGEACTIVE: 31194cf808e7SAl Viro case SIOCGIFNAME: 31209177efd3SArnd Bergmann return sock_do_ioctl(net, sock, cmd, arg); 31219177efd3SArnd Bergmann } 31229177efd3SArnd Bergmann 31236b96018bSArnd Bergmann return -ENOIOCTLCMD; 31246b96018bSArnd Bergmann } 31257a229387SArnd Bergmann 312695c96174SEric Dumazet static long compat_sock_ioctl(struct file *file, unsigned int cmd, 312789bbfc95SShaun Pereira unsigned long arg) 312889bbfc95SShaun Pereira { 312989bbfc95SShaun Pereira struct socket *sock = file->private_data; 313089bbfc95SShaun Pereira int ret = -ENOIOCTLCMD; 313187de87d5SDavid S. Miller struct sock *sk; 313287de87d5SDavid S. Miller struct net *net; 313387de87d5SDavid S. Miller 313487de87d5SDavid S. Miller sk = sock->sk; 313587de87d5SDavid S. Miller net = sock_net(sk); 313689bbfc95SShaun Pereira 313789bbfc95SShaun Pereira if (sock->ops->compat_ioctl) 313889bbfc95SShaun Pereira ret = sock->ops->compat_ioctl(sock, cmd, arg); 313989bbfc95SShaun Pereira 314087de87d5SDavid S. Miller if (ret == -ENOIOCTLCMD && 314187de87d5SDavid S. Miller (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)) 314287de87d5SDavid S. Miller ret = compat_wext_handle_ioctl(net, cmd, arg); 314387de87d5SDavid S. Miller 31446b96018bSArnd Bergmann if (ret == -ENOIOCTLCMD) 31456b96018bSArnd Bergmann ret = compat_sock_ioctl_trans(file, sock, cmd, arg); 31466b96018bSArnd Bergmann 314789bbfc95SShaun Pereira return ret; 314889bbfc95SShaun Pereira } 314989bbfc95SShaun Pereira #endif 315089bbfc95SShaun Pereira 3151ac5a488eSSridhar Samudrala int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) 3152ac5a488eSSridhar Samudrala { 3153ac5a488eSSridhar Samudrala return sock->ops->bind(sock, addr, addrlen); 3154ac5a488eSSridhar Samudrala } 3155c6d409cfSEric Dumazet EXPORT_SYMBOL(kernel_bind); 3156ac5a488eSSridhar Samudrala 3157ac5a488eSSridhar Samudrala int kernel_listen(struct socket *sock, int backlog) 3158ac5a488eSSridhar Samudrala { 3159ac5a488eSSridhar Samudrala return sock->ops->listen(sock, backlog); 3160ac5a488eSSridhar Samudrala } 3161c6d409cfSEric Dumazet EXPORT_SYMBOL(kernel_listen); 3162ac5a488eSSridhar Samudrala 3163ac5a488eSSridhar Samudrala int kernel_accept(struct socket *sock, struct socket **newsock, int flags) 3164ac5a488eSSridhar Samudrala { 3165ac5a488eSSridhar Samudrala struct sock *sk = sock->sk; 3166ac5a488eSSridhar Samudrala int err; 3167ac5a488eSSridhar Samudrala 3168ac5a488eSSridhar Samudrala err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, 3169ac5a488eSSridhar Samudrala newsock); 3170ac5a488eSSridhar Samudrala if (err < 0) 3171ac5a488eSSridhar Samudrala goto done; 3172ac5a488eSSridhar Samudrala 3173cdfbabfbSDavid Howells err = sock->ops->accept(sock, *newsock, flags, true); 3174ac5a488eSSridhar Samudrala if (err < 0) { 3175ac5a488eSSridhar Samudrala sock_release(*newsock); 3176fa8705b0STony Battersby *newsock = NULL; 3177ac5a488eSSridhar Samudrala goto done; 3178ac5a488eSSridhar Samudrala } 3179ac5a488eSSridhar Samudrala 3180ac5a488eSSridhar Samudrala (*newsock)->ops = sock->ops; 31811b08534eSWei Yongjun __module_get((*newsock)->ops->owner); 3182ac5a488eSSridhar Samudrala 3183ac5a488eSSridhar Samudrala done: 3184ac5a488eSSridhar Samudrala return err; 3185ac5a488eSSridhar Samudrala } 3186c6d409cfSEric Dumazet EXPORT_SYMBOL(kernel_accept); 3187ac5a488eSSridhar Samudrala 3188ac5a488eSSridhar Samudrala int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, 3189ac5a488eSSridhar Samudrala int flags) 3190ac5a488eSSridhar Samudrala { 3191ac5a488eSSridhar Samudrala return sock->ops->connect(sock, addr, addrlen, flags); 3192ac5a488eSSridhar Samudrala } 3193c6d409cfSEric Dumazet EXPORT_SYMBOL(kernel_connect); 3194ac5a488eSSridhar Samudrala 3195ac5a488eSSridhar Samudrala int kernel_getsockname(struct socket *sock, struct sockaddr *addr, 3196ac5a488eSSridhar Samudrala int *addrlen) 3197ac5a488eSSridhar Samudrala { 3198ac5a488eSSridhar Samudrala return sock->ops->getname(sock, addr, addrlen, 0); 3199ac5a488eSSridhar Samudrala } 3200c6d409cfSEric Dumazet EXPORT_SYMBOL(kernel_getsockname); 3201ac5a488eSSridhar Samudrala 3202ac5a488eSSridhar Samudrala int kernel_getpeername(struct socket *sock, struct sockaddr *addr, 3203ac5a488eSSridhar Samudrala int *addrlen) 3204ac5a488eSSridhar Samudrala { 3205ac5a488eSSridhar Samudrala return sock->ops->getname(sock, addr, addrlen, 1); 3206ac5a488eSSridhar Samudrala } 3207c6d409cfSEric Dumazet EXPORT_SYMBOL(kernel_getpeername); 3208ac5a488eSSridhar Samudrala 3209ac5a488eSSridhar Samudrala int kernel_getsockopt(struct socket *sock, int level, int optname, 3210ac5a488eSSridhar Samudrala char *optval, int *optlen) 3211ac5a488eSSridhar Samudrala { 3212ac5a488eSSridhar Samudrala mm_segment_t oldfs = get_fs(); 3213fb8621bbSNamhyung Kim char __user *uoptval; 3214fb8621bbSNamhyung Kim int __user *uoptlen; 3215ac5a488eSSridhar Samudrala int err; 3216ac5a488eSSridhar Samudrala 3217fb8621bbSNamhyung Kim uoptval = (char __user __force *) optval; 3218fb8621bbSNamhyung Kim uoptlen = (int __user __force *) optlen; 3219fb8621bbSNamhyung Kim 3220ac5a488eSSridhar Samudrala set_fs(KERNEL_DS); 3221ac5a488eSSridhar Samudrala if (level == SOL_SOCKET) 3222fb8621bbSNamhyung Kim err = sock_getsockopt(sock, level, optname, uoptval, uoptlen); 3223ac5a488eSSridhar Samudrala else 3224fb8621bbSNamhyung Kim err = sock->ops->getsockopt(sock, level, optname, uoptval, 3225fb8621bbSNamhyung Kim uoptlen); 3226ac5a488eSSridhar Samudrala set_fs(oldfs); 3227ac5a488eSSridhar Samudrala return err; 3228ac5a488eSSridhar Samudrala } 3229c6d409cfSEric Dumazet EXPORT_SYMBOL(kernel_getsockopt); 3230ac5a488eSSridhar Samudrala 3231ac5a488eSSridhar Samudrala int kernel_setsockopt(struct socket *sock, int level, int optname, 3232b7058842SDavid S. Miller char *optval, unsigned int optlen) 3233ac5a488eSSridhar Samudrala { 3234ac5a488eSSridhar Samudrala mm_segment_t oldfs = get_fs(); 3235fb8621bbSNamhyung Kim char __user *uoptval; 3236ac5a488eSSridhar Samudrala int err; 3237ac5a488eSSridhar Samudrala 3238fb8621bbSNamhyung Kim uoptval = (char __user __force *) optval; 3239fb8621bbSNamhyung Kim 3240ac5a488eSSridhar Samudrala set_fs(KERNEL_DS); 3241ac5a488eSSridhar Samudrala if (level == SOL_SOCKET) 3242fb8621bbSNamhyung Kim err = sock_setsockopt(sock, level, optname, uoptval, optlen); 3243ac5a488eSSridhar Samudrala else 3244fb8621bbSNamhyung Kim err = sock->ops->setsockopt(sock, level, optname, uoptval, 3245ac5a488eSSridhar Samudrala optlen); 3246ac5a488eSSridhar Samudrala set_fs(oldfs); 3247ac5a488eSSridhar Samudrala return err; 3248ac5a488eSSridhar Samudrala } 3249c6d409cfSEric Dumazet EXPORT_SYMBOL(kernel_setsockopt); 3250ac5a488eSSridhar Samudrala 3251ac5a488eSSridhar Samudrala int kernel_sendpage(struct socket *sock, struct page *page, int offset, 3252ac5a488eSSridhar Samudrala size_t size, int flags) 3253ac5a488eSSridhar Samudrala { 3254ac5a488eSSridhar Samudrala if (sock->ops->sendpage) 3255ac5a488eSSridhar Samudrala return sock->ops->sendpage(sock, page, offset, size, flags); 3256ac5a488eSSridhar Samudrala 3257ac5a488eSSridhar Samudrala return sock_no_sendpage(sock, page, offset, size, flags); 3258ac5a488eSSridhar Samudrala } 3259c6d409cfSEric Dumazet EXPORT_SYMBOL(kernel_sendpage); 3260ac5a488eSSridhar Samudrala 3261306b13ebSTom Herbert int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset, 3262306b13ebSTom Herbert size_t size, int flags) 3263306b13ebSTom Herbert { 3264306b13ebSTom Herbert struct socket *sock = sk->sk_socket; 3265306b13ebSTom Herbert 3266306b13ebSTom Herbert if (sock->ops->sendpage_locked) 3267306b13ebSTom Herbert return sock->ops->sendpage_locked(sk, page, offset, size, 3268306b13ebSTom Herbert flags); 3269306b13ebSTom Herbert 3270306b13ebSTom Herbert return sock_no_sendpage_locked(sk, page, offset, size, flags); 3271306b13ebSTom Herbert } 3272306b13ebSTom Herbert EXPORT_SYMBOL(kernel_sendpage_locked); 3273306b13ebSTom Herbert 327491cf45f0STrond Myklebust int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) 327591cf45f0STrond Myklebust { 327691cf45f0STrond Myklebust return sock->ops->shutdown(sock, how); 327791cf45f0STrond Myklebust } 327891cf45f0STrond Myklebust EXPORT_SYMBOL(kernel_sock_shutdown); 3279113c3075SR. Parameswaran 3280113c3075SR. Parameswaran /* This routine returns the IP overhead imposed by a socket i.e. 3281113c3075SR. Parameswaran * the length of the underlying IP header, depending on whether 3282113c3075SR. Parameswaran * this is an IPv4 or IPv6 socket and the length from IP options turned 328357240d00SR. Parameswaran * on at the socket. Assumes that the caller has a lock on the socket. 3284113c3075SR. Parameswaran */ 3285113c3075SR. Parameswaran u32 kernel_sock_ip_overhead(struct sock *sk) 3286113c3075SR. Parameswaran { 3287113c3075SR. Parameswaran struct inet_sock *inet; 3288113c3075SR. Parameswaran struct ip_options_rcu *opt; 3289113c3075SR. Parameswaran u32 overhead = 0; 3290113c3075SR. Parameswaran #if IS_ENABLED(CONFIG_IPV6) 3291113c3075SR. Parameswaran struct ipv6_pinfo *np; 3292113c3075SR. Parameswaran struct ipv6_txoptions *optv6 = NULL; 3293113c3075SR. Parameswaran #endif /* IS_ENABLED(CONFIG_IPV6) */ 3294113c3075SR. Parameswaran 3295113c3075SR. Parameswaran if (!sk) 3296113c3075SR. Parameswaran return overhead; 3297113c3075SR. Parameswaran 3298113c3075SR. Parameswaran switch (sk->sk_family) { 3299113c3075SR. Parameswaran case AF_INET: 3300113c3075SR. Parameswaran inet = inet_sk(sk); 3301113c3075SR. Parameswaran overhead += sizeof(struct iphdr); 3302113c3075SR. Parameswaran opt = rcu_dereference_protected(inet->inet_opt, 3303614d79c0Sstephen hemminger sock_owned_by_user(sk)); 3304113c3075SR. Parameswaran if (opt) 3305113c3075SR. Parameswaran overhead += opt->opt.optlen; 3306113c3075SR. Parameswaran return overhead; 3307113c3075SR. Parameswaran #if IS_ENABLED(CONFIG_IPV6) 3308113c3075SR. Parameswaran case AF_INET6: 3309113c3075SR. Parameswaran np = inet6_sk(sk); 3310113c3075SR. Parameswaran overhead += sizeof(struct ipv6hdr); 3311113c3075SR. Parameswaran if (np) 3312113c3075SR. Parameswaran optv6 = rcu_dereference_protected(np->opt, 3313614d79c0Sstephen hemminger sock_owned_by_user(sk)); 3314113c3075SR. Parameswaran if (optv6) 3315113c3075SR. Parameswaran overhead += (optv6->opt_flen + optv6->opt_nflen); 3316113c3075SR. Parameswaran return overhead; 3317113c3075SR. Parameswaran #endif /* IS_ENABLED(CONFIG_IPV6) */ 3318113c3075SR. Parameswaran default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */ 3319113c3075SR. Parameswaran return overhead; 3320113c3075SR. Parameswaran } 3321113c3075SR. Parameswaran } 3322113c3075SR. Parameswaran EXPORT_SYMBOL(kernel_sock_ip_overhead); 3323