diff options
Diffstat (limited to 'net/socket.c')
| -rw-r--r-- | net/socket.c | 1028 |
1 files changed, 586 insertions, 442 deletions
diff --git a/net/socket.c b/net/socket.c index 6d261bf206fc..1bc4167e0da8 100644 --- a/net/socket.c +++ b/net/socket.c @@ -42,7 +42,7 @@ * Andi Kleen : Some small cleanups, optimizations, * and fixed a copy_from_user() bug. * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0) - * Tigran Aivazian : Made listen(2) backlog sanity checks + * Tigran Aivazian : Made listen(2) backlog sanity checks * protocol-independent * * @@ -53,17 +53,17 @@ * * * This module is effectively the top level interface to the BSD socket - * paradigm. + * paradigm. * * Based upon Swansea University Computer Society NET3.039 */ #include <linux/mm.h> -#include <linux/smp_lock.h> #include <linux/socket.h> #include <linux/file.h> #include <linux/net.h> #include <linux/interrupt.h> +#include <linux/rcupdate.h> #include <linux/netdevice.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> @@ -96,25 +96,24 @@ static int sock_no_open(struct inode *irrelevant, struct file *dontcare); static ssize_t sock_aio_read(struct kiocb *iocb, char __user *buf, - size_t size, loff_t pos); + size_t size, loff_t pos); static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *buf, - size_t size, loff_t pos); -static int sock_mmap(struct file *file, struct vm_area_struct * vma); + size_t size, loff_t pos); +static int sock_mmap(struct file *file, struct vm_area_struct *vma); static int sock_close(struct inode *inode, struct file *file); static unsigned int sock_poll(struct file *file, struct poll_table_struct *wait); -static long sock_ioctl(struct file *file, - unsigned int cmd, unsigned long arg); +static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg); #ifdef CONFIG_COMPAT static long compat_sock_ioctl(struct file *file, - unsigned int cmd, unsigned long arg); + unsigned int cmd, unsigned long arg); #endif static int sock_fasync(int fd, struct file *filp, int on); static ssize_t sock_readv(struct file *file, const struct iovec *vector, unsigned long count, loff_t *ppos); static ssize_t sock_writev(struct file *file, const struct iovec *vector, - unsigned long count, loff_t *ppos); + unsigned long count, loff_t *ppos); static ssize_t sock_sendpage(struct file *file, struct page *page, int offset, size_t size, loff_t *ppos, int more); @@ -147,52 +146,8 @@ static struct file_operations socket_file_ops = { * The protocol list. Each protocol is registered in here. */ -static struct net_proto_family *net_families[NPROTO]; - -#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT) -static atomic_t net_family_lockct = ATOMIC_INIT(0); static DEFINE_SPINLOCK(net_family_lock); - -/* The strategy is: modifications net_family vector are short, do not - sleep and veeery rare, but read access should be free of any exclusive - locks. - */ - -static void net_family_write_lock(void) -{ - spin_lock(&net_family_lock); - while (atomic_read(&net_family_lockct) != 0) { - spin_unlock(&net_family_lock); - - yield(); - - spin_lock(&net_family_lock); - } -} - -static __inline__ void net_family_write_unlock(void) -{ - spin_unlock(&net_family_lock); -} - -static __inline__ void net_family_read_lock(void) -{ - atomic_inc(&net_family_lockct); - spin_unlock_wait(&net_family_lock); -} - -static __inline__ void net_family_read_unlock(void) -{ - atomic_dec(&net_family_lockct); -} - -#else -#define net_family_write_lock() do { } while(0) -#define net_family_write_unlock() do { } while(0) -#define net_family_read_lock() do { } while(0) -#define net_family_read_unlock() do { } while(0) -#endif - +static const struct net_proto_family *net_families[NPROTO] __read_mostly; /* * Statistics counters of the socket lists @@ -201,19 +156,20 @@ static __inline__ void net_family_read_unlock(void) static DEFINE_PER_CPU(int, sockets_in_use) = 0; /* - * Support routines. Move socket addresses back and forth across the kernel/user - * divide and look after the messy bits. + * Support routines. + * Move socket addresses back and forth across the kernel/user + * divide and look after the messy bits. */ -#define MAX_SOCK_ADDR 128 /* 108 for Unix domain - +#define MAX_SOCK_ADDR 128 /* 108 for Unix domain - 16 for IP, 16 for IPX, 24 for IPv6, - about 80 for AX.25 + about 80 for AX.25 must be at least one bigger than the AF_UNIX size (see net/unix/af_unix.c - :unix_mkname()). + :unix_mkname()). */ - + /** * move_addr_to_kernel - copy a socket address into kernel space * @uaddr: Address in user space @@ -227,11 +183,11 @@ static DEFINE_PER_CPU(int, sockets_in_use) = 0; int move_addr_to_kernel(void __user *uaddr, int ulen, void *kaddr) { - if(ulen<0||ulen>MAX_SOCK_ADDR) + if (ulen < 0 || ulen > MAX_SOCK_ADDR) return -EINVAL; - if(ulen==0) + if (ulen == 0) return 0; - if(copy_from_user(kaddr,uaddr,ulen)) + if (copy_from_user(kaddr, uaddr, ulen)) return -EFAULT; return audit_sockaddr(ulen, kaddr); } @@ -252,51 +208,52 @@ int move_addr_to_kernel(void __user *uaddr, int ulen, void *kaddr) * length of the data is written over the length limit the user * specified. Zero is returned for a success. */ - -int move_addr_to_user(void *kaddr, int klen, void __user *uaddr, int __user *ulen) + +int move_addr_to_user(void *kaddr, int klen, void __user *uaddr, + int __user *ulen) { int err; int len; - if((err=get_user(len, ulen))) + err = get_user(len, ulen); + if (err) return err; - if(len>klen) - len=klen; - if(len<0 || len> MAX_SOCK_ADDR) + if (len > klen) + len = klen; + if (len < 0 || len > MAX_SOCK_ADDR) return -EINVAL; - if(len) - { + if (len) { if (audit_sockaddr(klen, kaddr)) return -ENOMEM; - if(copy_to_user(uaddr,kaddr,len)) + if (copy_to_user(uaddr, kaddr, len)) return -EFAULT; } /* - * "fromlen shall refer to the value before truncation.." - * 1003.1g + * "fromlen shall refer to the value before truncation.." + * 1003.1g */ return __put_user(klen, ulen); } #define SOCKFS_MAGIC 0x534F434B -static kmem_cache_t * sock_inode_cachep __read_mostly; +static kmem_cache_t *sock_inode_cachep __read_mostly; static struct inode *sock_alloc_inode(struct super_block *sb) { struct socket_alloc *ei; - ei = (struct socket_alloc *)kmem_cache_alloc(sock_inode_cachep, SLAB_KERNEL); + + ei = kmem_cache_alloc(sock_inode_cachep, SLAB_KERNEL); if (!ei) return NULL; init_waitqueue_head(&ei->socket.wait); - + ei->socket.fasync_list = NULL; ei->socket.state = SS_UNCONNECTED; ei->socket.flags = 0; ei->socket.ops = NULL; ei->socket.sk = NULL; ei->socket.file = NULL; - ei->socket.flags = 0; return &ei->vfs_inode; } @@ -307,22 +264,25 @@ static void sock_destroy_inode(struct inode *inode) container_of(inode, struct socket_alloc, vfs_inode)); } -static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) +static void init_once(void *foo, kmem_cache_t *cachep, unsigned long flags) { - struct socket_alloc *ei = (struct socket_alloc *) foo; + struct socket_alloc *ei = (struct socket_alloc *)foo; - if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == - SLAB_CTOR_CONSTRUCTOR) + if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) + == SLAB_CTOR_CONSTRUCTOR) inode_init_once(&ei->vfs_inode); } - + static int init_inodecache(void) { sock_inode_cachep = kmem_cache_create("sock_inode_cache", - sizeof(struct socket_alloc), - 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| - SLAB_MEM_SPREAD), - init_once, NULL); + sizeof(struct socket_alloc), + 0, + (SLAB_HWCACHE_ALIGN | + SLAB_RECLAIM_ACCOUNT | + SLAB_MEM_SPREAD), + init_once, + NULL); if (sock_inode_cachep == NULL) return -ENOMEM; return 0; @@ -335,7 +295,8 @@ static struct super_operations sockfs_ops = { }; static int sockfs_get_sb(struct file_system_type *fs_type, - int flags, const char *dev_name, void *data, struct vfsmount *mnt) + int flags, const char *dev_name, void *data, + struct vfsmount *mnt) { return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC, mnt); @@ -348,12 +309,13 @@ static struct file_system_type sock_fs_type = { .get_sb = sockfs_get_sb, .kill_sb = kill_anon_super, }; + static int sockfs_delete_dentry(struct dentry *dentry) { return 1; } static struct dentry_operations sockfs_dentry_operations = { - .d_delete = sockfs_delete_dentry, + .d_delete = sockfs_delete_dentry, }; /* @@ -477,10 +439,12 @@ struct socket *sockfd_lookup(int fd, int *err) struct file *file; struct socket *sock; - if (!(file = fget(fd))) { + file = fget(fd); + if (!file) { *err = -EBADF; return NULL; } + sock = sock_from_file(file, err); if (!sock) fput(file); @@ -505,7 +469,7 @@ static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) /** * sock_alloc - allocate a socket - * + * * Allocate a new inode and socket object. The two are bound together * and initialised. The socket is then returned. If we are out of inodes * NULL is returned. @@ -513,8 +477,8 @@ static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) static struct socket *sock_alloc(void) { - struct inode * inode; - struct socket * sock; + struct inode *inode; + struct socket *sock; inode = new_inode(sock_mnt->mnt_sb); if (!inode) @@ -522,7 +486,7 @@ static struct socket *sock_alloc(void) sock = SOCKET_I(inode); - inode->i_mode = S_IFSOCK|S_IRWXUGO; + inode->i_mode = S_IFSOCK | S_IRWXUGO; inode->i_uid = current->fsuid; inode->i_gid = current->fsgid; @@ -536,7 +500,7 @@ static struct socket *sock_alloc(void) * a back door. Remember to keep it shut otherwise you'll let the * creepy crawlies in. */ - + static int sock_no_open(struct inode *irrelevant, struct file *dontcare) { return -ENXIO; @@ -553,9 +517,9 @@ const struct file_operations bad_sock_fops = { * * The socket is released from the protocol stack if it has a release * callback, and the inode is then released if the socket is bound to - * an inode not a file. + * an inode not a file. */ - + void sock_release(struct socket *sock) { if (sock->ops) { @@ -575,10 +539,10 @@ void sock_release(struct socket *sock) iput(SOCK_INODE(sock)); return; } - sock->file=NULL; + sock->file = NULL; } -static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock, +static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t size) { struct sock_iocb *si = kiocb_to_siocb(iocb); @@ -621,14 +585,14 @@ int kernel_sendmsg(struct socket *sock, struct msghdr *msg, * the following is safe, since for compiler definitions of kvec and * iovec are identical, yielding the same in-core layout and alignment */ - msg->msg_iov = (struct iovec *)vec, + msg->msg_iov = (struct iovec *)vec; msg->msg_iovlen = num; result = sock_sendmsg(sock, msg, size); set_fs(oldfs); return result; } -static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock, +static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t size, int flags) { int err; @@ -647,14 +611,14 @@ static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock, return sock->ops->recvmsg(iocb, sock, msg, size, flags); } -int sock_recvmsg(struct socket *sock, struct msghdr *msg, +int sock_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, int flags) { struct kiocb iocb; struct sock_iocb siocb; int ret; - init_sync_kiocb(&iocb, NULL); + init_sync_kiocb(&iocb, NULL); iocb.private = &siocb; ret = __sock_recvmsg(&iocb, sock, msg, size, flags); if (-EIOCBQUEUED == ret) @@ -662,9 +626,8 @@ int sock_recvmsg(struct socket *sock, struct msghdr *msg, return ret; } -int kernel_recvmsg(struct socket *sock, struct msghdr *msg, - struct kvec *vec, size_t num, - size_t size, int flags) +int kernel_recvmsg(struct socket *sock, struct msghdr *msg, + struct kvec *vec, size_t num, size_t size, int flags) { mm_segment_t oldfs = get_fs(); int result; @@ -674,8 +637,7 @@ int kernel_recvmsg(struct socket *sock, struct msghdr *msg, * the following is safe, since for compiler definitions of kvec and * iovec are identical, yielding the same in-core layout and alignment */ - msg->msg_iov = (struct iovec *)vec, - msg->msg_iovlen = num; + msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num; result = sock_recvmsg(sock, msg, size, flags); set_fs(oldfs); return result; @@ -702,7 +664,8 @@ static ssize_t sock_sendpage(struct file *file, struct page *page, } static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb, - char __user *ubuf, size_t size, struct sock_iocb *siocb) + char __user *ubuf, size_t size, + struct sock_iocb *siocb) { if (!is_sync_kiocb(iocb)) { siocb = kmalloc(sizeof(*siocb), GFP_KERNEL); @@ -720,20 +683,21 @@ static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb, } static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb, - struct file *file, struct iovec *iov, unsigned long nr_segs) + struct file *file, struct iovec *iov, + unsigned long nr_segs) { struct socket *sock = file->private_data; size_t size = 0; int i; - for (i = 0 ; i < nr_segs ; i++) - size += iov[i].iov_len; + for (i = 0; i < nr_segs; i++) + size += iov[i].iov_len; msg->msg_name = NULL; msg->msg_namelen = 0; msg->msg_control = NULL; msg->msg_controllen = 0; - msg->msg_iov = (struct iovec *) iov; + msg->msg_iov = (struct iovec *)iov; msg->msg_iovlen = nr_segs; msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; @@ -748,7 +712,7 @@ static ssize_t sock_readv(struct file *file, const struct iovec *iov, struct msghdr msg; int ret; - init_sync_kiocb(&iocb, NULL); + init_sync_kiocb(&iocb, NULL); iocb.private = &siocb; ret = do_sock_read(&msg, &iocb, file, (struct iovec *)iov, nr_segs); @@ -758,7 +722,7 @@ static ssize_t sock_readv(struct file *file, const struct iovec *iov, } static ssize_t sock_aio_read(struct kiocb *iocb, char __user *ubuf, - size_t count, loff_t pos) + size_t count, loff_t pos) { struct sock_iocb siocb, *x; @@ -771,24 +735,25 @@ static ssize_t sock_aio_read(struct kiocb *iocb, char __user *ubuf, if (!x) return -ENOMEM; return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, - &x->async_iov, 1); + &x->async_iov, 1); } static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb, - struct file *file, struct iovec *iov, unsigned long nr_segs) + struct file *file, struct iovec *iov, + unsigned long nr_segs) { struct socket *sock = file->private_data; size_t size = 0; int i; - for (i = 0 ; i < nr_segs ; i++) - size += iov[i].iov_len; + for (i = 0; i < nr_segs; i++) + size += iov[i].iov_len; msg->msg_name = NULL; msg->msg_namelen = 0; msg->msg_control = NULL; msg->msg_controllen = 0; - msg->msg_iov = (struct iovec *) iov; + msg->msg_iov = (struct iovec *)iov; msg->msg_iovlen = nr_segs; msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; if (sock->type == SOCK_SEQPACKET) @@ -815,7 +780,7 @@ static ssize_t sock_writev(struct file *file, const struct iovec *iov, } static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *ubuf, - size_t count, loff_t pos) + size_t count, loff_t pos) { struct sock_iocb siocb, *x; @@ -829,46 +794,48 @@ static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *ubuf, return -ENOMEM; return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, - &x->async_iov, 1); + &x->async_iov, 1); } - /* * Atomic setting of ioctl hooks to avoid race * with module unload. */ static DEFINE_MUTEX(br_ioctl_mutex); -static int (*br_ioctl_hook)(unsigned int cmd, void __user *arg) = NULL; +static int (*br_ioctl_hook) (unsigned int cmd, void __user *arg) = NULL; -void brioctl_set(int (*hook)(unsigned int, void __user *)) +void brioctl_set(int (*hook) (unsigned int, void __user *)) { mutex_lock(&br_ioctl_mutex); br_ioctl_hook = hook; mutex_unlock(&br_ioctl_mutex); } + EXPORT_SYMBOL(brioctl_set); static DEFINE_MUTEX(vlan_ioctl_mutex); -static int (*vlan_ioctl_hook)(void __user *arg); +static int (*vlan_ioctl_hook) (void __user *arg); -void vlan_ioctl_set(int (*hook)(void __user *)) +void vlan_ioctl_set(int (*hook) (void __user *)) { mutex_lock(&vlan_ioctl_mutex); vlan_ioctl_hook = hook; mutex_unlock(&vlan_ioctl_mutex); } + EXPORT_SYMBOL(vlan_ioctl_set); static DEFINE_MUTEX(dlci_ioctl_mutex); -static int (*dlci_ioctl_hook)(unsigned int, void __user *); +static int (*dlci_ioctl_hook) (unsigned int, void __user *); -void dlci_ioctl_set(int (*hook)(unsigned int, void __user *)) +void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) { mutex_lock(&dlci_ioctl_mutex); dlci_ioctl_hook = hook; mutex_unlock(&dlci_ioctl_mutex); } + EXPORT_SYMBOL(dlci_ioctl_set); /* @@ -890,8 +857,8 @@ static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { err = dev_ioctl(cmd, argp); } else -#endif /* CONFIG_WIRELESS_EXT */ - switch (cmd) { +#endif /* CONFIG_WIRELESS_EXT */ + switch (cmd) { case FIOSETOWN: case SIOCSPGRP: err = -EFAULT; @@ -901,7 +868,8 @@ static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) break; case FIOGETOWN: case SIOCGPGRP: - err = put_user(sock->file->f_owner.pid, (int __user *)argp); + err = put_user(sock->file->f_owner.pid, + (int __user *)argp); break; case SIOCGIFBR: case SIOCSIFBR: @@ -912,7 +880,7 @@ static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) request_module("bridge"); mutex_lock(&br_ioctl_mutex); - if (br_ioctl_hook) + if (br_ioctl_hook) err = br_ioctl_hook(cmd, argp); mutex_unlock(&br_ioctl_mutex); break; @@ -929,7 +897,7 @@ static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) break; case SIOCGIFDIVERT: case SIOCSIFDIVERT: - /* Convert this to call through a hook */ + /* Convert this to call through a hook */ err = divert_ioctl(cmd, argp); break; case SIOCADDDLCI: @@ -954,7 +922,7 @@ static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) if (err == -ENOIOCTLCMD) err = dev_ioctl(cmd, argp); break; - } + } return err; } @@ -962,7 +930,7 @@ int sock_create_lite(int family, int type, int protocol, struct socket **res) { int err; struct socket *sock = NULL; - + err = security_socket_create(family, type, protocol, 1); if (err) goto out; @@ -973,26 +941,33 @@ int sock_create_lite(int family, int type, int protocol, struct socket **res) goto out; } - security_socket_post_create(sock, family, type, protocol, 1); sock->type = type; + err = security_socket_post_create(sock, family, type, protocol, 1); + if (err) + goto out_release; + out: *res = sock; return err; +out_release: + sock_release(sock); + sock = NULL; + goto out; } /* No kernel lock held - perfect */ -static unsigned int sock_poll(struct file *file, poll_table * wait) +static unsigned int sock_poll(struct file *file, poll_table *wait) { struct socket *sock; /* - * We can't return errors to poll, so it's either yes or no. + * We can't return errors to poll, so it's either yes or no. */ sock = file->private_data; return sock->ops->poll(file, sock, wait); } -static int sock_mmap(struct file * file, struct vm_area_struct * vma) +static int sock_mmap(struct file *file, struct vm_area_struct *vma) { struct socket *sock = file->private_data; @@ -1002,12 +977,11 @@ static int sock_mmap(struct file * file, struct vm_area_struct * vma) static int sock_close(struct inode *inode, struct file *filp) { /* - * It was possible the inode is NULL we were - * closing an unfinished socket. + * It was possible the inode is NULL we were + * closing an unfinished socket. */ - if (!inode) - { + if (!inode) { printk(KERN_DEBUG "sock_close: NULL inode\n"); return 0; } @@ -1033,57 +1007,52 @@ static int sock_close(struct inode *inode, struct file *filp) static int sock_fasync(int fd, struct file *filp, int on) { - struct fasync_struct *fa, *fna=NULL, **prev; + struct fasync_struct *fa, *fna = NULL, **prev; struct socket *sock; struct sock *sk; - if (on) - { + if (on) { fna = kmalloc(sizeof(struct fasync_struct), GFP_KERNEL); - if(fna==NULL) + if (fna == NULL) return -ENOMEM; } sock = filp->private_data; - if ((sk=sock->sk) == NULL) { + sk = sock->sk; + if (sk == NULL) { kfree(fna); return -EINVAL; } lock_sock(sk); - prev=&(sock->fasync_list); + prev = &(sock->fasync_list); - for (fa=*prev; fa!=NULL; prev=&fa->fa_next,fa=*prev) - if (fa->fa_file==filp) + for (fa = *prev; fa != NULL; prev = &fa->fa_next, fa = *prev) + if (fa->fa_file == filp) break; - if(on) - { - if(fa!=NULL) - { + if (on) { + if (fa != NULL) { write_lock_bh(&sk->sk_callback_lock); - fa->fa_fd=fd; + fa->fa_fd = fd; write_unlock_bh(&sk->sk_callback_lock); kfree(fna); goto out; } - fna->fa_file=filp; - fna->fa_fd=fd; - fna->magic=FASYNC_MAGIC; - fna->fa_next=sock->fasync_list; + fna->fa_file = filp; + fna->fa_fd = fd; + fna->magic = FASYNC_MAGIC; + fna->fa_next = sock->fasync_list; write_lock_bh(&sk->sk_callback_lock); - sock->fasync_list=fna; + sock->fasync_list = fna; write_unlock_bh(&sk->sk_callback_lock); - } - else - { - if (fa!=NULL) - { + } else { + if (fa != NULL) { write_lock_bh(&sk->sk_callback_lock); - *prev=fa->fa_next; + *prev = fa->fa_next; write_unlock_bh(&sk->sk_callback_lock); kfree(fa); } @@ -1100,10 +1069,9 @@ int sock_wake_async(struct socket *sock, int how, int band) { if (!sock || !sock->fasync_list) return -1; - switch (how) - { + switch (how) { case 1: - + if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags)) break; goto call_kill; @@ -1112,7 +1080,7 @@ int sock_wake_async(struct socket *sock, int how, int band) break; /* fall through */ case 0: - call_kill: +call_kill: __kill_fasync(sock->fasync_list, SIGIO, band); break; case 3: @@ -1121,13 +1089,15 @@ int sock_wake_async(struct socket *sock, int how, int band) return 0; } -static int __sock_create(int family, int type, int protocol, struct socket **res, int kern) +static int __sock_create(int family, int type, int protocol, + struct socket **res, int kern) { int err; struct socket *sock; + const struct net_proto_family *pf; /* - * Check protocol is in range + * Check protocol is in range */ if (family < 0 || family >= NPROTO) return -EAFNOSUPPORT; @@ -1140,10 +1110,11 @@ static int __sock_create(int family, int type, int protocol, struct socket **res deadlock in module load. */ if (family == PF_INET && type == SOCK_PACKET) { - static int warned; + static int warned; if (!warned) { warned = 1; - printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n", current->comm); + printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n", + current->comm); } family = PF_PACKET; } @@ -1151,79 +1122,84 @@ static int __sock_create(int family, int type, int protocol, struct socket **res err = security_socket_create(family, type, protocol, kern); if (err) return err; - + + /* + * Allocate the socket and allow the family to set things up. if + * the protocol is 0, the family is instructed to select an appropriate + * default. + */ + sock = sock_alloc(); + if (!sock) { + if (net_ratelimit()) + printk(KERN_WARNING "socket: no more sockets\n"); + return -ENFILE; /* Not exactly a match, but its the + closest posix thing */ + } + + sock->type = type; + #if defined(CONFIG_KMOD) - /* Attempt to load a protocol module if the find failed. - * - * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user + /* Attempt to load a protocol module if the find failed. + * + * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user * requested real, full-featured networking support upon configuration. * Otherwise module support will break! */ - if (net_families[family]==NULL) - { - request_module("net-pf-%d",family); - } + if (net_families[family] == NULL) + request_module("net-pf-%d", family); #endif - net_family_read_lock(); - if (net_families[family] == NULL) { - err = -EAFNOSUPPORT; - goto out; - } - -/* - * Allocate the socket and allow the family to set things up. if - * the protocol is 0, the family is instructed to select an appropriate - * default. - */ - - if (!(sock = sock_alloc())) { - if (net_ratelimit()) - printk(KERN_WARNING "socket: no more sockets\n"); - err = -ENFILE; /* Not exactly a match, but its the - closest posix thing */ - goto out; - } - - sock->type = type; + rcu_read_lock(); + pf = rcu_dereference(net_families[family]); + err = -EAFNOSUPPORT; + if (!pf) + goto out_release; /* * We will call the ->create function, that possibly is in a loadable * module, so we have to bump that loadable module refcnt first. */ - err = -EAFNOSUPPORT; - if (!try_module_get(net_families[family]->owner)) + if (!try_module_get(pf->owner)) goto out_release; - if ((err = net_families[family]->create(sock, protocol)) < 0) { - sock->ops = NULL; + /* Now protected by module ref count */ + rcu_read_unlock(); + + err = pf->create(sock, protocol); + if (err < 0) goto out_module_put; - } /* * Now to bump the refcnt of the [loadable] module that owns this * socket at sock_release time we decrement its refcnt. */ - if (!try_module_get(sock->ops->owner)) { - sock->ops = NULL; - goto out_module_put; - } + if (!try_module_get(sock->ops->owner)) + goto out_module_busy; + /* * Now that we're done with the ->create function, the [loadable] * module can have its refcnt decremented */ - module_put(net_families[family]->owner); + module_put(pf->owner); + err = security_socket_post_create(sock, family, type, protocol, kern); + if (err) + goto out_release; *res = sock; - security_socket_post_create(sock, family, type, protocol, kern); -out: - net_family_read_unlock(); - return err; + return 0; + +out_module_busy: + err = -EAFNOSUPPORT; out_module_put: - module_put(net_families[family]->owner); -out_release: + sock->ops = NULL; + module_put(pf->owner); +out_sock_release: sock_release(sock); - goto out; + return err; + +out_release: + rcu_read_unlock(); + goto out_sock_release; } int sock_create(int family, int type, int protocol, struct socket **res) @@ -1262,7 +1238,8 @@ out_release: * Create a pair of connected sockets. */ -asmlinkage long sys_socketpair(int family, int type, int protocol, int __user *usockvec) +asmlinkage long sys_socketpair(int family, int type, int protocol, + int __user *usockvec) { struct socket *sock1, *sock2; int fd1, fd2, err; @@ -1281,7 +1258,7 @@ asmlinkage long sys_socketpair(int family, int type, int protocol, int __user *u goto out_release_1; err = sock1->ops->socketpair(sock1, sock2); - if (err < 0) + if (err < 0) goto out_release_both; fd1 = fd2 = -1; @@ -1300,7 +1277,7 @@ asmlinkage long sys_socketpair(int family, int type, int protocol, int __user *u * Not kernel problem. */ - err = put_user(fd1, &usockvec[0]); + err = put_user(fd1, &usockvec[0]); if (!err) err = put_user(fd2, &usockvec[1]); if (!err) @@ -1311,19 +1288,18 @@ asmlinkage long sys_socketpair(int family, int type, int protocol, int __user *u return err; out_close_1: - sock_release(sock2); + sock_release(sock2); sys_close(fd1); return err; out_release_both: - sock_release(sock2); + sock_release(sock2); out_release_1: - sock_release(sock1); + sock_release(sock1); out: return err; } - /* * Bind a name to a socket. Nothing much to do here since it's * the protocol's responsibility to handle the local address. @@ -1338,35 +1314,39 @@ asmlinkage long sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) char address[MAX_SOCK_ADDR]; int err, fput_needed; - if((sock = sockfd_lookup_light(fd, &err, &fput_needed))!=NULL) - { - if((err=move_addr_to_kernel(umyaddr,addrlen,address))>=0) { - err = security_socket_bind(sock, (struct sockaddr *)address, addrlen); + sock = sockfd_lookup_light(fd, &err, &fput_needed); + if(sock) { + err = move_addr_to_kernel(umyaddr, addrlen, address); + if (err >= 0) { + err = security_socket_bind(sock, + (struct sockaddr *)address, + addrlen); if (!err) err = sock->ops->bind(sock, - (struct sockaddr *)address, addrlen); + (struct sockaddr *) + address, addrlen); } fput_light(sock->file, fput_needed); - } + } return err; } - /* * Perform a listen. Basically, we allow the protocol to do anything * necessary for a listen, and if that works, we mark the socket as * ready for listening. */ -int sysctl_somaxconn = SOMAXCONN; +int sysctl_somaxconn __read_mostly = SOMAXCONN; asmlinkage long sys_listen(int fd, int backlog) { struct socket *sock; int err, fput_needed; - - if ((sock = sockfd_lookup_light(fd, &err, &fput_needed)) != NULL) { - if ((unsigned) backlog > sysctl_somaxconn) + + sock = sockfd_lookup_light(fd, &err, &fput_needed); + if (sock) { + if ((unsigned)backlog > sysctl_somaxconn) backlog = sysctl_somaxconn; err = security_socket_listen(sock, backlog); @@ -1378,7 +1358,6 @@ asmlinkage long sys_listen(int fd, int backlog) return err; } - /* * For accept, we attempt to create a new socket, set up the link * with the client, wake up the client, then return the new @@ -1391,7 +1370,8 @@ asmlinkage long sys_listen(int fd, int backlog) * clean when we restucture accept also. */ -asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr, int __user *upeer_addrlen) +asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr, + int __user *upeer_addrlen) { struct socket *sock, *newsock; struct file *newfile; @@ -1403,7 +1383,7 @@ asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr, int _ goto out; err = -ENFILE; - if (!(newsock = sock_alloc())) + if (!(newsock = sock_alloc())) goto out_put; newsock->type = sock->type; @@ -1435,11 +1415,13 @@ asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr, int _ goto out_fd; if (upeer_sockaddr) { - if(newsock->ops->getname(newsock, (struct sockaddr *)address, &len, 2)<0) { + if (newsock->ops->getname(newsock, (struct sockaddr *)address, + &len, 2) < 0) { err = -ECONNABORTED; goto out_fd; } - err = move_addr_to_user(address, len, upeer_sockaddr, upeer_addrlen); + err = move_addr_to_user(address, len, upeer_sockaddr, + upeer_addrlen); if (err < 0) goto out_fd; } @@ -1461,7 +1443,6 @@ out_fd: goto out_put; } - /* * Attempt to connect to a socket with the server address. The address * is in user space so we verify it is OK and move it to kernel space. @@ -1474,7 +1455,8 @@ out_fd: * include the -EINPROGRESS status for such sockets. */ -asmlinkage long sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen) +asmlinkage long sys_connect(int fd, struct sockaddr __user *uservaddr, + int addrlen) { struct socket *sock; char address[MAX_SOCK_ADDR]; @@ -1487,11 +1469,12 @@ asmlinkage long sys_connect(int fd, struct sockaddr __user *uservaddr, int addrl if (err < 0) goto out_put; - err = security_socket_connect(sock, (struct sockaddr *)address, addrlen); + err = + security_socket_connect(sock, (struct sockaddr *)address, addrlen); if (err) goto out_put; - err = sock->ops->connect(sock, (struct sockaddr *) address, addrlen, + err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen, sock->file->f_flags); out_put: fput_light(sock->file, fput_needed); @@ -1504,12 +1487,13 @@ out: * name to user space. */ -asmlinkage long sys_getsockname(int fd, struct sockaddr __user *usockaddr, int __user *usockaddr_len) +asmlinkage long sys_getsockname(int fd, struct sockaddr __user *usockaddr, + int __user *usockaddr_len) { struct socket *sock; char address[MAX_SOCK_ADDR]; int len, err, fput_needed; - + sock = sockfd_lookup_light(fd, &err, &fput_needed); if (!sock) goto out; @@ -1534,22 +1518,27 @@ out: * name to user space. */ -asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr, int __user *usockaddr_len) +asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr, + int __user *usockaddr_len) { struct socket *sock; char address[MAX_SOCK_ADDR]; int len, err, fput_needed; - if ((sock = sockfd_lookup_light(fd, &err, &fput_needed)) != NULL) { + sock = sockfd_lookup_light(fd, &err, &fput_needed); + if (sock != NULL) { err = security_socket_getpeername(sock); if (err) { fput_light(sock->file, fput_needed); return err; } - err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 1); + err = + sock->ops->getname(sock, (struct sockaddr *)address, &len, + 1); if (!err) - err=move_addr_to_user(address,len, usockaddr, usockaddr_len); + err = move_addr_to_user(address, len, usockaddr, + usockaddr_len); fput_light(sock->file, fput_needed); } return err; @@ -1561,8 +1550,9 @@ asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr, int _ * the protocol. */ -asmlinkage long sys_sendto(int fd, void __user * buff, size_t len, unsigned flags, - struct sockaddr __user *addr, int addr_len) +asmlinkage long sys_sendto(int fd, void __user *buff, size_t len, + unsigned flags, struct sockaddr __user *addr, + int addr_len) { struct socket *sock; char address[MAX_SOCK_ADDR]; @@ -1579,54 +1569,55 @@ asmlinkage long sys_sendto(int fd, void __user * buff, size_t len, unsigned flag sock = sock_from_file(sock_file, &err); if (!sock) goto out_put; - iov.iov_base=buff; - iov.iov_len=len; - msg.msg_name=NULL; - msg.msg_iov=&iov; - msg.msg_iovlen=1; - msg.msg_control=NULL; - msg.msg_controllen=0; - msg.msg_namelen=0; + iov.iov_base = buff; + iov.iov_len = len; + msg.msg_name = NULL; + msg.msg_iov = &iov; + msg.msg_iovlen = 1; + msg.msg_control = NULL; + msg.msg_controllen = 0; + msg.msg_namelen = 0; if (addr) { err = move_addr_to_kernel(addr, addr_len, address); if (err < 0) goto out_put; - msg.msg_name=address; - msg.msg_namelen=addr_len; + msg.msg_name = address; + msg.msg_namelen = addr_len; } if (sock->file->f_flags & O_NONBLOCK) flags |= MSG_DONTWAIT; msg.msg_flags = flags; err = sock_sendmsg(sock, &msg, len); -out_put: +out_put: fput_light(sock_file, fput_needed); return err; } /* - * Send a datagram down a socket. + * Send a datagram down a socket. */ -asmlinkage long sys_send(int fd, void __user * buff, size_t len, unsigned flags) +asmlinkage long sys_send(int fd, void __user *buff, size_t len, unsigned flags) { return sys_sendto(fd, buff, len, flags, NULL, 0); } /* - * Receive a frame from the socket and optionally record the address of the + * Receive a frame from the socket and optionally record the address of the * sender. We verify the buffers are writable and if needed move the * sender address from kernel to user space. */ -asmlinkage long sys_recvfrom(int fd, void __user * ubuf, size_t size, unsigned flags, - struct sockaddr __user *addr, int __user *addr_len) +asmlinkage long sys_recvfrom(int fd, void __user *ubuf, size_t size, + unsigned flags, struct sockaddr __user *addr, + int __user *addr_len) { struct socket *sock; struct iovec iov; struct msghdr msg; char address[MAX_SOCK_ADDR]; - int err,err2; + int err, err2; struct file *sock_file; int fput_needed; @@ -1638,23 +1629,22 @@ asmlinkage long sys_recvfrom(int fd, void __user * ubuf, size_t size, unsigned f if (!sock) goto out; - msg.msg_control=NULL; - msg.msg_controllen=0; - msg.msg_iovlen=1; - msg.msg_iov=&iov; - iov.iov_len=size; - iov.iov_base=ubuf; - msg.msg_name=address; - msg.msg_namelen=MAX_SOCK_ADDR; + msg.msg_control = NULL; + msg.msg_controllen = 0; + msg.msg_iovlen = 1; + msg.msg_iov = &iov; + iov.iov_len = size; + iov.iov_base = ubuf; + msg.msg_name = address; + msg.msg_namelen = MAX_SOCK_ADDR; if (sock->file->f_flags & O_NONBLOCK) flags |= MSG_DONTWAIT; - err=sock_recvmsg(sock, &msg, size, flags); + err = sock_recvmsg(sock, &msg, size, flags); - if(err >= 0 && addr != NULL) - { - err2=move_addr_to_user(address, msg.msg_namelen, addr, addr_len); - if(err2<0) - err=err2; + if (err >= 0 && addr != NULL) { + err2 = move_addr_to_user(address, msg.msg_namelen, addr, addr_len); + if (err2 < 0) + err = err2; } out: fput_light(sock_file, fput_needed); @@ -1662,10 +1652,11 @@ out: } /* - * Receive a datagram from a socket. + * Receive a datagram from a socket. */ -asmlinkage long sys_recv(int fd, void __user * ubuf, size_t size, unsigned flags) +asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size, + unsigned flags) { return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); } @@ -1675,24 +1666,29 @@ asmlinkage long sys_recv(int fd, void __user * ubuf, size_t size, unsigned flags * to pass the user mode parameter for the protocols to sort out. */ -asmlinkage long sys_setsockopt(int fd, int level, int optname, char __user *optval, int optlen) +asmlinkage long sys_setsockopt(int fd, int level, int optname, + char __user *optval, int optlen) { int err, fput_needed; struct socket *sock; if (optlen < 0) return -EINVAL; - - if ((sock = sockfd_lookup_light(fd, &err, &fput_needed)) != NULL) - { - err = security_socket_setsockopt(sock,level,optname); + + sock = sockfd_lookup_light(fd, &err, &fput_needed); + if (sock != NULL) { + err = security_socket_setsockopt(sock, level, optname); if (err) goto out_put; if (level == SOL_SOCKET) - err=sock_setsockopt(sock,level,optname,optval,optlen); + err = + sock_setsockopt(sock, level, optname, optval, + optlen); else - err=sock->ops->setsockopt(sock, level, optname, optval, optlen); + err = + sock->ops->setsockopt(sock, level, optname, optval, + optlen); out_put: fput_light(sock->file, fput_needed); } @@ -1704,27 +1700,32 @@ out_put: * to pass a user mode parameter for the protocols to sort out. */ -asmlinkage long sys_getsockopt(int fd, int level, int optname, char __user *optval, int __user *optlen) +asmlinkage long sys_getsockopt(int fd, int level, int optname, + char __user *optval, int __user *optlen) { int err, fput_needed; struct socket *sock; - if ((sock = sockfd_lookup_light(fd, &err, &fput_needed)) != NULL) { + sock = sockfd_lookup_light(fd, &err, &fput_needed); + if (sock != NULL) { err = security_socket_getsockopt(sock, level, optname); if (err) goto out_put; if (level == SOL_SOCKET) - err=sock_getsockopt(sock,level,optname,optval,optlen); + err = + sock_getsockopt(sock, level, optname, optval, + optlen); else - err=sock->ops->getsockopt(sock, level, optname, optval, optlen); + err = + sock->ops->getsockopt(sock, level, optname, optval, + optlen); out_put: fput_light(sock->file, fput_needed); } return err; } - /* * Shutdown a socket. */ @@ -1734,8 +1735,8 @@ asmlinkage long sys_shutdown(int fd, int how) int err, fput_needed; struct socket *sock; - if ((sock = sockfd_lookup_light(fd, &err, &fput_needed))!=NULL) - { + sock = sockfd_lookup_light(fd, &err, &fput_needed); + if (sock != NULL) { err = security_socket_shutdown(sock, how); if (!err) err = sock->ops->shutdown(sock, how); @@ -1744,41 +1745,42 @@ asmlinkage long sys_shutdown(int fd, int how) return err; } -/* A couple of helpful macros for getting the address of the 32/64 bit +/* A couple of helpful macros for getting the address of the 32/64 bit * fields which are the same type (int / unsigned) on our platforms. */ #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) - /* * BSD sendmsg interface */ asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags) { - struct compat_msghdr __user *msg_compat = (struct compat_msghdr __user *)msg; + struct compat_msghdr __user *msg_compat = + (struct compat_msghdr __user *)msg; struct socket *sock; char address[MAX_SOCK_ADDR]; struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; unsigned char ctl[sizeof(struct cmsghdr) + 20] - __attribute__ ((aligned (sizeof(__kernel_size_t)))); - /* 20 is size of ipv6_pktinfo */ + __attribute__ ((aligned(sizeof(__kernel_size_t)))); + /* 20 is size of ipv6_pktinfo */ unsigned char *ctl_buf = ctl; struct msghdr msg_sys; int err, ctl_len, iov_size, total_len; int fput_needed; - + err = -EFAULT; if (MSG_CMSG_COMPAT & flags) { if (get_compat_msghdr(&msg_sys, msg_compat)) return -EFAULT; - } else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) + } + else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) return -EFAULT; sock = sockfd_lookup_light(fd, &err, &fput_needed); - if (!sock) + if (!sock) goto out; /* do not move before msg_sys is valid */ @@ -1786,7 +1788,7 @@ asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags) if (msg_sys.msg_iovlen > UIO_MAXIOV) goto out_put; - /* Check whether to allocate the iovec area*/ + /* Check whether to allocate the iovec area */ err = -ENOMEM; iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); if (msg_sys.msg_iovlen > UIO_FASTIOV) { @@ -1800,7 +1802,7 @@ asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags) err = verify_compat_iovec(&msg_sys, iov, address, VERIFY_READ); } else err = verify_iovec(&msg_sys, iov, address, VERIFY_READ); - if (err < 0) + if (err < 0) goto out_freeiov; total_len = err; @@ -1808,18 +1810,19 @@ asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags) if (msg_sys.msg_controllen > INT_MAX) goto out_freeiov; - ctl_len = msg_sys.msg_controllen; + ctl_len = msg_sys.msg_controllen; if ((MSG_CMSG_COMPAT & flags) && ctl_len) { - err = cmsghdr_from_user_compat_to_kern(&msg_sys, sock->sk, ctl, sizeof(ctl)); + err = + cmsghdr_from_user_compat_to_kern(&msg_sys, sock->sk, ctl, + sizeof(ctl)); if (err) goto out_freeiov; ctl_buf = msg_sys.msg_control; ctl_len = msg_sys.msg_controllen; } else if (ctl_len) { - if (ctl_len > sizeof(ctl)) - { + if (ctl_len > sizeof(ctl)) { ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); - if (ctl_buf == NULL) + if (ctl_buf == NULL) goto out_freeiov; } err = -EFAULT; @@ -1828,7 +1831,8 @@ asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags) * Afterwards, it will be a kernel pointer. Thus the compiler-assisted * checking falls down on this. */ - if (copy_from_user(ctl_buf, (void __user *) msg_sys.msg_control, ctl_len)) + if (copy_from_user(ctl_buf, (void __user *)msg_sys.msg_control, + ctl_len)) goto out_freectl; msg_sys.msg_control = ctl_buf; } @@ -1839,14 +1843,14 @@ asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags) err = sock_sendmsg(sock, &msg_sys, total_len); out_freectl: - if (ctl_buf != ctl) + if (ctl_buf != ctl) sock_kfree_s(sock->sk, ctl_buf, ctl_len); out_freeiov: if (iov != iovstack) sock_kfree_s(sock->sk, iov, iov_size); out_put: fput_light(sock->file, fput_needed); -out: +out: return err; } @@ -1854,12 +1858,14 @@ out: * BSD recvmsg interface */ -asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg, unsigned int flags) +asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg, + unsigned int flags) { - struct compat_msghdr __user *msg_compat = (struct compat_msghdr __user *)msg; + struct compat_msghdr __user *msg_compat = + (struct compat_msghdr __user *)msg; struct socket *sock; struct iovec iovstack[UIO_FASTIOV]; - struct iovec *iov=iovstack; + struct iovec *iov = iovstack; struct msghdr msg_sys; unsigned long cmsg_ptr; int err, iov_size, total_len, len; @@ -1871,13 +1877,13 @@ asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg, unsigned int flag /* user mode address pointers */ struct sockaddr __user *uaddr; int __user *uaddr_len; - + if (MSG_CMSG_COMPAT & flags) { if (get_compat_msghdr(&msg_sys, msg_compat)) return -EFAULT; - } else - if (copy_from_user(&msg_sys,msg,sizeof(struct msghdr))) - return -EFAULT; + } + else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) + return -EFAULT; sock = sockfd_lookup_light(fd, &err, &fput_needed); if (!sock) @@ -1886,8 +1892,8 @@ asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg, unsigned int flag err = -EMSGSIZE; if (msg_sys.msg_iovlen > UIO_MAXIOV) goto out_put; - - /* Check whether to allocate the iovec area*/ + + /* Check whether to allocate the iovec area */ err = -ENOMEM; iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); if (msg_sys.msg_iovlen > UIO_FASTIOV) { @@ -1897,11 +1903,11 @@ asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg, unsigned int flag } /* - * Save the user-mode address (verify_iovec will change the - * kernel msghdr to use the kernel address space) + * Save the user-mode address (verify_iovec will change the + * kernel msghdr to use the kernel address space) */ - - uaddr = (void __user *) msg_sys.msg_name; + + uaddr = (void __user *)msg_sys.msg_name; uaddr_len = COMPAT_NAMELEN(msg); if (MSG_CMSG_COMPAT & flags) { err = verify_compat_iovec(&msg_sys, iov, addr, VERIFY_WRITE); @@ -1909,13 +1915,13 @@ asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg, unsigned int flag err = verify_iovec(&msg_sys, iov, addr, VERIFY_WRITE); if (err < 0) goto out_freeiov; - total_len=err; + total_len = err; cmsg_ptr = (unsigned long)msg_sys.msg_control; msg_sys.msg_flags = 0; if (MSG_CMSG_COMPAT & flags) msg_sys.msg_flags = MSG_CMSG_COMPAT; - + if (sock->file->f_flags & O_NONBLOCK) flags |= MSG_DONTWAIT; err = sock_recvmsg(sock, &msg_sys, total_len, flags); @@ -1924,7 +1930,8 @@ asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg, unsigned int flag len = err; if (uaddr != NULL) { - err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr, uaddr_len); + err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr, + uaddr_len); if (err < 0) goto out_freeiov; } @@ -1933,10 +1940,10 @@ asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg, unsigned int flag if (err) goto out_freeiov; if (MSG_CMSG_COMPAT & flags) - err = __put_user((unsigned long)msg_sys.msg_control-cmsg_ptr, + err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr, &msg_compat->msg_controllen); else - err = __put_user((unsigned long)msg_sys.msg_control-cmsg_ptr, + err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr, &msg->msg_controllen); if (err) goto out_freeiov; @@ -1955,163 +1962,187 @@ out: /* Argument list sizes for sys_socketcall */ #define AL(x) ((x) * sizeof(unsigned long)) -static unsigned char nargs[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3), - AL(3),AL(3),AL(4),AL(4),AL(4),AL(6), - AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)}; +static const unsigned char nargs[18]={ + AL(0),AL(3),AL(3),AL(3),AL(2),AL(3), + AL(3),AL(3),AL(4),AL(4),AL(4),AL(6), + AL(6),AL(2),AL(5),AL(5),AL(3),AL(3) +}; + #undef AL /* - * System call vectors. + * System call vectors. * * Argument checking cleaned up. Saved 20% in size. * This function doesn't need to set the kernel lock because - * it is set by the callees. + * it is set by the callees. */ asmlinkage long sys_socketcall(int call, unsigned long __user *args) { unsigned long a[6]; - unsigned long a0,a1; + unsigned long a0, a1; int err; - if(call<1||call>SYS_RECVMSG) + if (call < 1 || call > SYS_RECVMSG) return -EINVAL; /* copy_from_user should be SMP safe. */ if (copy_from_user(a, args, nargs[call])) return -EFAULT; - err = audit_socketcall(nargs[call]/sizeof(unsigned long), a); + err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); if (err) return err; - a0=a[0]; - a1=a[1]; - - switch(call) - { - case SYS_SOCKET: - err = sys_socket(a0,a1,a[2]); - break; - case SYS_BIND: - err = sys_bind(a0,(struct sockaddr __user *)a1, a[2]); - break; - case SYS_CONNECT: - err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); - break; - case SYS_LISTEN: - err = sys_listen(a0,a1); - break; - case SYS_ACCEPT: - err = sys_accept(a0,(struct sockaddr __user *)a1, (int __user *)a[2]); - break; - case SYS_GETSOCKNAME: - err = sys_getsockname(a0,(struct sockaddr __user *)a1, (int __user *)a[2]); - break; - case SYS_GETPEERNAME: - err = sys_getpeername(a0, (struct sockaddr __user *)a1, (int __user *)a[2]); - break; - case SYS_SOCKETPAIR: - err = sys_socketpair(a0,a1, a[2], (int __user *)a[3]); - break; - case SYS_SEND: - err = sys_send(a0, (void __user *)a1, a[2], a[3]); - break; - case SYS_SENDTO: - err = sys_sendto(a0,(void __user *)a1, a[2], a[3], - (struct sockaddr __user *)a[4], a[5]); - break; - case SYS_RECV: - err = sys_recv(a0, (void __user *)a1, a[2], a[3]); - break; - case SYS_RECVFROM: - err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], - (struct sockaddr __user *)a[4], (int __user *)a[5]); - break; - case SYS_SHUTDOWN: - err = sys_shutdown(a0,a1); - break; - case SYS_SETSOCKOPT: - err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); - break; - case SYS_GETSOCKOPT: - err = sys_getsockopt(a0, a1, a[2], (char __user *)a[3], (int __user *)a[4]); - break; - case SYS_SENDMSG: - err = sys_sendmsg(a0, (struct msghdr __user *) a1, a[2]); - break; - case SYS_RECVMSG: - err = sys_recvmsg(a0, (struct msghdr __user *) a1, a[2]); - break; - default: - err = -EINVAL; - break; + a0 = a[0]; + a1 = a[1]; + + switch (call) { + case SYS_SOCKET: + err = sys_socket(a0, a1, a[2]); + break; + case SYS_BIND: + err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]); + break; + case SYS_CONNECT: + err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); + break; + case SYS_LISTEN: + err = sys_listen(a0, a1); + break; + case SYS_ACCEPT: + err = + sys_accept(a0, (struct sockaddr __user *)a1, + (int __user *)a[2]); + break; + case SYS_GETSOCKNAME: + err = + sys_getsockname(a0, (struct sockaddr __user *)a1, + (int __user *)a[2]); + break; + case SYS_GETPEERNAME: + err = + sys_getpeername(a0, (struct sockaddr __user *)a1, + (int __user *)a[2]); + break; + case SYS_SOCKETPAIR: + err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]); + break; + case SYS_SEND: + err = sys_send(a0, (void __user *)a1, a[2], a[3]); + break; + case SYS_SENDTO: + err = sys_sendto(a0, (void __user *)a1, a[2], a[3], + (struct sockaddr __user *)a[4], a[5]); + break; + case SYS_RECV: + err = sys_recv(a0, (void __user *)a1, a[2], a[3]); + break; + case SYS_RECVFROM: + err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], + (struct sockaddr __user *)a[4], + (int __user *)a[5]); + break; + case SYS_SHUTDOWN: + err = sys_shutdown(a0, a1); + break; + case SYS_SETSOCKOPT: + err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); + break; + case SYS_GETSOCKOPT: + err = + sys_getsockopt(a0, a1, a[2], (char __user *)a[3], + (int __user *)a[4]); + break; + case SYS_SENDMSG: + err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]); + break; + case SYS_RECVMSG: + err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]); + break; + default: + err = -EINVAL; + break; } return err; } -#endif /* __ARCH_WANT_SYS_SOCKETCALL */ +#endif /* __ARCH_WANT_SYS_SOCKETCALL */ -/* +/** + * sock_register - add a socket protocol handler + * @ops: description of protocol + * * This function is called by a protocol handler that wants to * advertise its address family, and have it linked into the - * SOCKET module. + * socket interface. The value ops->family coresponds to the + * socket system call protocol family. */ - -int sock_register(struct net_proto_family *ops) +int sock_register(const struct net_proto_family *ops) { int err; if (ops->family >= NPROTO) { - printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); + printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, + NPROTO); return -ENOBUFS; } - net_family_write_lock(); - err = -EEXIST; - if (net_families[ops->family] == NULL) { - net_families[ops->family]=ops; + + spin_lock(&net_family_lock); + if (net_families[ops->family]) + err = -EEXIST; + else { + net_families[ops->family] = ops; err = 0; } - net_family_write_unlock(); - printk(KERN_INFO "NET: Registered protocol family %d\n", - ops->family); + spin_unlock(&net_family_lock); + + printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family); return err; } -/* +/** + * sock_unregister - remove a protocol handler + * @family: protocol family to remove + * * This function is called by a protocol handler that wants to * remove its address family, and have it unlinked from the - * SOCKET module. + * new socket creation. + * + * If protocol handler is a module, then it can use module reference + * counts to protect against new references. If protocol handler is not + * a module then it needs to provide its own protection in + * the ops->create routine. */ - -int sock_unregister(int family) +void sock_unregister(int family) { - if (family < 0 || family >= NPROTO) - return -1; + BUG_ON(family < 0 || family >= NPROTO); - net_family_write_lock(); - net_families[family]=NULL; - net_family_write_unlock(); - printk(KERN_INFO "NET: Unregistered protocol family %d\n", - family); - return 0; + spin_lock(&net_family_lock); + net_families[family] = NULL; + spin_unlock(&net_family_lock); + + synchronize_rcu(); + + printk(KERN_INFO "NET: Unregistered protocol family %d\n", family); } static int __init sock_init(void) { /* - * Initialize sock SLAB cache. + * Initialize sock SLAB cache. */ - + sk_init(); /* - * Initialize skbuff SLAB cache + * Initialize skbuff SLAB cache */ skb_init(); /* - * Initialize the protocols module. + * Initialize the protocols module. */ init_inodecache(); @@ -2137,7 +2168,7 @@ void socket_seq_show(struct seq_file *seq) int counter = 0; for_each_possible_cpu(cpu) - counter += per_cpu(sockets_in_use, cpu); + counter += per_cpu(sockets_in_use, cpu); /* It can be negative, by the way. 8) */ if (counter < 0) @@ -2145,11 +2176,11 @@ void socket_seq_show(struct seq_file *seq) seq_printf(seq, "sockets: used %d\n", counter); } -#endif /* CONFIG_PROC_FS */ +#endif /* CONFIG_PROC_FS */ #ifdef CONFIG_COMPAT static long compat_sock_ioctl(struct file *file, unsigned cmd, - unsigned long arg) + unsigned long arg) { struct socket *sock = file->private_data; int ret = -ENOIOCTLCMD; @@ -2161,6 +2192,109 @@ static long compat_sock_ioctl(struct file *file, unsigned cmd, } #endif +int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) +{ + return sock->ops->bind(sock, addr, addrlen); +} + +int kernel_listen(struct socket *sock, int backlog) +{ + return sock->ops->listen(sock, backlog); +} + +int kernel_accept(struct socket *sock, struct socket **newsock, int flags) +{ + struct sock *sk = sock->sk; + int err; + + err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, + newsock); + if (err < 0) + goto done; + + err = sock->ops->accept(sock, *newsock, flags); + if (err < 0) { + sock_release(*newsock); + goto done; + } + + (*newsock)->ops = sock->ops; + +done: + return err; +} + +int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, + int flags) +{ + return sock->ops->connect(sock, addr, addrlen, flags); +} + +int kernel_getsockname(struct socket *sock, struct sockaddr *addr, + int *addrlen) +{ + return sock->ops->getname(sock, addr, addrlen, 0); +} + +int kernel_getpeername(struct socket *sock, struct sockaddr *addr, + int *addrlen) +{ + return sock->ops->getname(sock, addr, addrlen, 1); +} + +int kernel_getsockopt(struct socket *sock, int level, int optname, + char *optval, int *optlen) +{ + mm_segment_t oldfs = get_fs(); + int err; + + set_fs(KERNEL_DS); + if (level == SOL_SOCKET) + err = sock_getsockopt(sock, level, optname, optval, optlen); + else + err = sock->ops->getsockopt(sock, level, optname, optval, + optlen); + set_fs(oldfs); + return err; +} + +int kernel_setsockopt(struct socket *sock, int level, int optname, + char *optval, int optlen) +{ + mm_segment_t oldfs = get_fs(); + int err; + + set_fs(KERNEL_DS); + if (level == SOL_SOCKET) + err = sock_setsockopt(sock, level, optname, optval, optlen); + else + err = sock->ops->setsockopt(sock, level, optname, optval, + optlen); + set_fs(oldfs); + return err; +} + +int kernel_sendpage(struct socket *sock, struct page *page, int offset, + size_t size, int flags) +{ + if (sock->ops->sendpage) + return sock->ops->sendpage(sock, page, offset, size, flags); + + return sock_no_sendpage(sock, page, offset, size, flags); +} + +int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg) +{ + mm_segment_t oldfs = get_fs(); + int err; + + set_fs(KERNEL_DS); + err = sock->ops->ioctl(sock, cmd, arg); + set_fs(oldfs); + + return err; +} + /* ABI emulation layers need these two */ EXPORT_SYMBOL(move_addr_to_kernel); EXPORT_SYMBOL(move_addr_to_user); @@ -2177,3 +2311,13 @@ EXPORT_SYMBOL(sock_wake_async); EXPORT_SYMBOL(sockfd_lookup); EXPORT_SYMBOL(kernel_sendmsg); EXPORT_SYMBOL(kernel_recvmsg); +EXPORT_SYMBOL(kernel_bind); +EXPORT_SYMBOL(kernel_listen); +EXPORT_SYMBOL(kernel_accept); +EXPORT_SYMBOL(kernel_connect); +EXPORT_SYMBOL(kernel_getsockname); +EXPORT_SYMBOL(kernel_getpeername); +EXPORT_SYMBOL(kernel_getsockopt); +EXPORT_SYMBOL(kernel_setsockopt); +EXPORT_SYMBOL(kernel_sendpage); +EXPORT_SYMBOL(kernel_sock_ioctl); |