socket.c
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上传日期:2013-02-24
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- /* $Id: socket.c,v 1.5 2001/02/13 01:16:44 davem Exp $
- * socket.c: Socket syscall emulation for Solaris 2.6+
- *
- * Copyright (C) 1998 Jakub Jelinek (jj@ultra.linux.cz)
- *
- * 1999-08-19 Fixed socketpair code
- * Jason Rappleye (rappleye@ccr.buffalo.edu)
- */
- #include <linux/types.h>
- #include <linux/smp_lock.h>
- #include <linux/mm.h>
- #include <linux/slab.h>
- #include <linux/socket.h>
- #include <linux/file.h>
- #include <asm/uaccess.h>
- #include <asm/string.h>
- #include <asm/oplib.h>
- #include <asm/idprom.h>
- #include "conv.h"
- #define SOCK_SOL_STREAM 2
- #define SOCK_SOL_DGRAM 1
- #define SOCK_SOL_RAW 4
- #define SOCK_SOL_RDM 5
- #define SOCK_SOL_SEQPACKET 6
- #define SOL_SO_SNDLOWAT 0x1003
- #define SOL_SO_RCVLOWAT 0x1004
- #define SOL_SO_SNDTIMEO 0x1005
- #define SOL_SO_RCVTIMEO 0x1006
- #define SOL_SO_STATE 0x2000
- #define SOL_SS_NDELAY 0x040
- #define SOL_SS_NONBLOCK 0x080
- #define SOL_SS_ASYNC 0x100
- #define SO_STATE 0x000e
- static int socket_check(int family, int type)
- {
- if (family != PF_UNIX && family != PF_INET)
- return -ESOCKTNOSUPPORT;
- switch (type) {
- case SOCK_SOL_STREAM: type = SOCK_STREAM; break;
- case SOCK_SOL_DGRAM: type = SOCK_DGRAM; break;
- case SOCK_SOL_RAW: type = SOCK_RAW; break;
- case SOCK_SOL_RDM: type = SOCK_RDM; break;
- case SOCK_SOL_SEQPACKET: type = SOCK_SEQPACKET; break;
- default: return -EINVAL;
- }
- return type;
- }
- static int solaris_to_linux_sockopt(int optname)
- {
- switch (optname) {
- case SOL_SO_SNDLOWAT: optname = SO_SNDLOWAT; break;
- case SOL_SO_RCVLOWAT: optname = SO_RCVLOWAT; break;
- case SOL_SO_SNDTIMEO: optname = SO_SNDTIMEO; break;
- case SOL_SO_RCVTIMEO: optname = SO_RCVTIMEO; break;
- case SOL_SO_STATE: optname = SO_STATE; break;
- };
-
- return optname;
- }
-
- asmlinkage int solaris_socket(int family, int type, int protocol)
- {
- int (*sys_socket)(int, int, int) =
- (int (*)(int, int, int))SYS(socket);
- type = socket_check (family, type);
- if (type < 0) return type;
- return sys_socket(family, type, protocol);
- }
- asmlinkage int solaris_socketpair(int *usockvec)
- {
- int (*sys_socketpair)(int, int, int, int *) =
- (int (*)(int, int, int, int *))SYS(socketpair);
- /* solaris socketpair really only takes one arg at the syscall
- * level, int * usockvec. The libs apparently take care of
- * making sure that family==AF_UNIX and type==SOCK_STREAM. The
- * pointer we really want ends up residing in the first (and
- * supposedly only) argument.
- */
- return sys_socketpair(AF_UNIX, SOCK_STREAM, 0, (int *)usockvec);
- }
- asmlinkage int solaris_bind(int fd, struct sockaddr *addr, int addrlen)
- {
- int (*sys_bind)(int, struct sockaddr *, int) =
- (int (*)(int, struct sockaddr *, int))SUNOS(104);
- return sys_bind(fd, addr, addrlen);
- }
- asmlinkage int solaris_setsockopt(int fd, int level, int optname, u32 optval, int optlen)
- {
- int (*sunos_setsockopt)(int, int, int, u32, int) =
- (int (*)(int, int, int, u32, int))SUNOS(105);
- optname = solaris_to_linux_sockopt(optname);
- if (optname < 0)
- return optname;
- if (optname == SO_STATE)
- return 0;
- return sunos_setsockopt(fd, level, optname, optval, optlen);
- }
- asmlinkage int solaris_getsockopt(int fd, int level, int optname, u32 optval, u32 optlen)
- {
- int (*sunos_getsockopt)(int, int, int, u32, u32) =
- (int (*)(int, int, int, u32, u32))SUNOS(118);
- optname = solaris_to_linux_sockopt(optname);
- if (optname < 0)
- return optname;
- if (optname == SO_STATE)
- optname = SOL_SO_STATE;
- return sunos_getsockopt(fd, level, optname, optval, optlen);
- }
- asmlinkage int solaris_connect(int fd, struct sockaddr *addr, int addrlen)
- {
- int (*sys_connect)(int, struct sockaddr *, int) =
- (int (*)(int, struct sockaddr *, int))SYS(connect);
- return sys_connect(fd, addr, addrlen);
- }
- asmlinkage int solaris_accept(int fd, struct sockaddr *addr, int *addrlen)
- {
- int (*sys_accept)(int, struct sockaddr *, int *) =
- (int (*)(int, struct sockaddr *, int *))SYS(accept);
- return sys_accept(fd, addr, addrlen);
- }
- asmlinkage int solaris_listen(int fd, int backlog)
- {
- int (*sys_listen)(int, int) =
- (int (*)(int, int))SUNOS(106);
- return sys_listen(fd, backlog);
- }
- asmlinkage int solaris_shutdown(int fd, int how)
- {
- int (*sys_shutdown)(int, int) =
- (int (*)(int, int))SYS(shutdown);
- return sys_shutdown(fd, how);
- }
- #define MSG_SOL_OOB 0x1
- #define MSG_SOL_PEEK 0x2
- #define MSG_SOL_DONTROUTE 0x4
- #define MSG_SOL_EOR 0x8
- #define MSG_SOL_CTRUNC 0x10
- #define MSG_SOL_TRUNC 0x20
- #define MSG_SOL_WAITALL 0x40
- #define MSG_SOL_DONTWAIT 0x80
- static int solaris_to_linux_msgflags(int flags)
- {
- int fl = flags & (MSG_OOB|MSG_PEEK|MSG_DONTROUTE);
-
- if (flags & MSG_SOL_EOR) fl |= MSG_EOR;
- if (flags & MSG_SOL_CTRUNC) fl |= MSG_CTRUNC;
- if (flags & MSG_SOL_TRUNC) fl |= MSG_TRUNC;
- if (flags & MSG_SOL_WAITALL) fl |= MSG_WAITALL;
- if (flags & MSG_SOL_DONTWAIT) fl |= MSG_DONTWAIT;
- return fl;
- }
- static int linux_to_solaris_msgflags(int flags)
- {
- int fl = flags & (MSG_OOB|MSG_PEEK|MSG_DONTROUTE);
-
- if (flags & MSG_EOR) fl |= MSG_SOL_EOR;
- if (flags & MSG_CTRUNC) fl |= MSG_SOL_CTRUNC;
- if (flags & MSG_TRUNC) fl |= MSG_SOL_TRUNC;
- if (flags & MSG_WAITALL) fl |= MSG_SOL_WAITALL;
- if (flags & MSG_DONTWAIT) fl |= MSG_SOL_DONTWAIT;
- return fl;
- }
- asmlinkage int solaris_recvfrom(int s, char *buf, int len, int flags, u32 from, u32 fromlen)
- {
- int (*sys_recvfrom)(int, void *, size_t, unsigned, struct sockaddr *, int *) =
- (int (*)(int, void *, size_t, unsigned, struct sockaddr *, int *))SYS(recvfrom);
-
- return sys_recvfrom(s, buf, len, solaris_to_linux_msgflags(flags), (struct sockaddr *)A(from), (int *)A(fromlen));
- }
- asmlinkage int solaris_recv(int s, char *buf, int len, int flags)
- {
- int (*sys_recvfrom)(int, void *, size_t, unsigned, struct sockaddr *, int *) =
- (int (*)(int, void *, size_t, unsigned, struct sockaddr *, int *))SYS(recvfrom);
-
- return sys_recvfrom(s, buf, len, solaris_to_linux_msgflags(flags), NULL, NULL);
- }
- asmlinkage int solaris_sendto(int s, char *buf, int len, int flags, u32 to, u32 tolen)
- {
- int (*sys_sendto)(int, void *, size_t, unsigned, struct sockaddr *, int *) =
- (int (*)(int, void *, size_t, unsigned, struct sockaddr *, int *))SYS(sendto);
-
- return sys_sendto(s, buf, len, solaris_to_linux_msgflags(flags), (struct sockaddr *)A(to), (int *)A(tolen));
- }
- asmlinkage int solaris_send(int s, char *buf, int len, int flags)
- {
- int (*sys_sendto)(int, void *, size_t, unsigned, struct sockaddr *, int *) =
- (int (*)(int, void *, size_t, unsigned, struct sockaddr *, int *))SYS(sendto);
-
- return sys_sendto(s, buf, len, solaris_to_linux_msgflags(flags), NULL, NULL);
- }
- asmlinkage int solaris_getpeername(int fd, struct sockaddr *addr, int *addrlen)
- {
- int (*sys_getpeername)(int, struct sockaddr *, int *) =
- (int (*)(int, struct sockaddr *, int *))SYS(getpeername);
- return sys_getpeername(fd, addr, addrlen);
- }
- asmlinkage int solaris_getsockname(int fd, struct sockaddr *addr, int *addrlen)
- {
- int (*sys_getsockname)(int, struct sockaddr *, int *) =
- (int (*)(int, struct sockaddr *, int *))SYS(getsockname);
- return sys_getsockname(fd, addr, addrlen);
- }
- /* XXX This really belongs in some header file... -DaveM */
- #define MAX_SOCK_ADDR 128 /* 108 for Unix domain -
- 16 for IP, 16 for IPX,
- 24 for IPv6,
- about 80 for AX.25 */
- /* XXX These as well... */
- extern __inline__ struct socket *socki_lookup(struct inode *inode)
- {
- return &inode->u.socket_i;
- }
- extern __inline__ struct socket *sockfd_lookup(int fd, int *err)
- {
- struct file *file;
- struct inode *inode;
- if (!(file = fget(fd))) {
- *err = -EBADF;
- return NULL;
- }
- inode = file->f_dentry->d_inode;
- if (!inode->i_sock || !socki_lookup(inode)) {
- *err = -ENOTSOCK;
- fput(file);
- return NULL;
- }
- return socki_lookup(inode);
- }
- extern __inline__ void sockfd_put(struct socket *sock)
- {
- fput(sock->file);
- }
- struct sol_nmsghdr {
- u32 msg_name;
- int msg_namelen;
- u32 msg_iov;
- u32 msg_iovlen;
- u32 msg_control;
- u32 msg_controllen;
- u32 msg_flags;
- };
- struct sol_cmsghdr {
- u32 cmsg_len;
- int cmsg_level;
- int cmsg_type;
- unsigned char cmsg_data[0];
- };
- struct iovec32 {
- u32 iov_base;
- u32 iov_len;
- };
- static inline int iov_from_user32_to_kern(struct iovec *kiov,
- struct iovec32 *uiov32,
- int niov)
- {
- int tot_len = 0;
- while(niov > 0) {
- u32 len, buf;
- if(get_user(len, &uiov32->iov_len) ||
- get_user(buf, &uiov32->iov_base)) {
- tot_len = -EFAULT;
- break;
- }
- tot_len += len;
- kiov->iov_base = (void *)A(buf);
- kiov->iov_len = (__kernel_size_t) len;
- uiov32++;
- kiov++;
- niov--;
- }
- return tot_len;
- }
- static inline int msghdr_from_user32_to_kern(struct msghdr *kmsg,
- struct sol_nmsghdr *umsg)
- {
- u32 tmp1, tmp2, tmp3;
- int err;
- err = get_user(tmp1, &umsg->msg_name);
- err |= __get_user(tmp2, &umsg->msg_iov);
- err |= __get_user(tmp3, &umsg->msg_control);
- if (err)
- return -EFAULT;
- kmsg->msg_name = (void *)A(tmp1);
- kmsg->msg_iov = (struct iovec *)A(tmp2);
- kmsg->msg_control = (void *)A(tmp3);
- err = get_user(kmsg->msg_namelen, &umsg->msg_namelen);
- err |= get_user(kmsg->msg_controllen, &umsg->msg_controllen);
- err |= get_user(kmsg->msg_flags, &umsg->msg_flags);
-
- kmsg->msg_flags = solaris_to_linux_msgflags(kmsg->msg_flags);
-
- return err;
- }
- /* I've named the args so it is easy to tell whose space the pointers are in. */
- static int verify_iovec32(struct msghdr *kern_msg, struct iovec *kern_iov,
- char *kern_address, int mode)
- {
- int tot_len;
- if(kern_msg->msg_namelen) {
- if(mode==VERIFY_READ) {
- int err = move_addr_to_kernel(kern_msg->msg_name,
- kern_msg->msg_namelen,
- kern_address);
- if(err < 0)
- return err;
- }
- kern_msg->msg_name = kern_address;
- } else
- kern_msg->msg_name = NULL;
- if(kern_msg->msg_iovlen > UIO_FASTIOV) {
- kern_iov = kmalloc(kern_msg->msg_iovlen * sizeof(struct iovec),
- GFP_KERNEL);
- if(!kern_iov)
- return -ENOMEM;
- }
- tot_len = iov_from_user32_to_kern(kern_iov,
- (struct iovec32 *)kern_msg->msg_iov,
- kern_msg->msg_iovlen);
- if(tot_len >= 0)
- kern_msg->msg_iov = kern_iov;
- else if(kern_msg->msg_iovlen > UIO_FASTIOV)
- kfree(kern_iov);
- return tot_len;
- }
- asmlinkage int solaris_sendmsg(int fd, struct sol_nmsghdr *user_msg, unsigned user_flags)
- {
- struct socket *sock;
- char address[MAX_SOCK_ADDR];
- struct iovec iov[UIO_FASTIOV];
- unsigned char ctl[sizeof(struct cmsghdr) + 20];
- unsigned char *ctl_buf = ctl;
- struct msghdr kern_msg;
- int err, total_len;
- if(msghdr_from_user32_to_kern(&kern_msg, user_msg))
- return -EFAULT;
- if(kern_msg.msg_iovlen > UIO_MAXIOV)
- return -EINVAL;
- err = verify_iovec32(&kern_msg, iov, address, VERIFY_READ);
- if (err < 0)
- goto out;
- total_len = err;
- if(kern_msg.msg_controllen) {
- struct sol_cmsghdr *ucmsg = (struct sol_cmsghdr *)kern_msg.msg_control;
- unsigned long *kcmsg;
- __kernel_size_t32 cmlen;
- if(kern_msg.msg_controllen > sizeof(ctl) &&
- kern_msg.msg_controllen <= 256) {
- err = -ENOBUFS;
- ctl_buf = kmalloc(kern_msg.msg_controllen, GFP_KERNEL);
- if(!ctl_buf)
- goto out_freeiov;
- }
- __get_user(cmlen, &ucmsg->cmsg_len);
- kcmsg = (unsigned long *) ctl_buf;
- *kcmsg++ = (unsigned long)cmlen;
- err = -EFAULT;
- if(copy_from_user(kcmsg, &ucmsg->cmsg_level,
- kern_msg.msg_controllen - sizeof(__kernel_size_t32)))
- goto out_freectl;
- kern_msg.msg_control = ctl_buf;
- }
- kern_msg.msg_flags = solaris_to_linux_msgflags(user_flags);
- lock_kernel();
- sock = sockfd_lookup(fd, &err);
- if (sock != NULL) {
- if (sock->file->f_flags & O_NONBLOCK)
- kern_msg.msg_flags |= MSG_DONTWAIT;
- err = sock_sendmsg(sock, &kern_msg, total_len);
- sockfd_put(sock);
- }
- unlock_kernel();
- out_freectl:
- /* N.B. Use kfree here, as kern_msg.msg_controllen might change? */
- if(ctl_buf != ctl)
- kfree(ctl_buf);
- out_freeiov:
- if(kern_msg.msg_iov != iov)
- kfree(kern_msg.msg_iov);
- out:
- return err;
- }
- asmlinkage int solaris_recvmsg(int fd, struct sol_nmsghdr *user_msg, unsigned int user_flags)
- {
- struct iovec iovstack[UIO_FASTIOV];
- struct msghdr kern_msg;
- char addr[MAX_SOCK_ADDR];
- struct socket *sock;
- struct iovec *iov = iovstack;
- struct sockaddr *uaddr;
- int *uaddr_len;
- unsigned long cmsg_ptr;
- int err, total_len, len = 0;
- if(msghdr_from_user32_to_kern(&kern_msg, user_msg))
- return -EFAULT;
- if(kern_msg.msg_iovlen > UIO_MAXIOV)
- return -EINVAL;
- uaddr = kern_msg.msg_name;
- uaddr_len = &user_msg->msg_namelen;
- err = verify_iovec32(&kern_msg, iov, addr, VERIFY_WRITE);
- if (err < 0)
- goto out;
- total_len = err;
- cmsg_ptr = (unsigned long) kern_msg.msg_control;
- kern_msg.msg_flags = 0;
- lock_kernel();
- sock = sockfd_lookup(fd, &err);
- if (sock != NULL) {
- if (sock->file->f_flags & O_NONBLOCK)
- user_flags |= MSG_DONTWAIT;
- err = sock_recvmsg(sock, &kern_msg, total_len, user_flags);
- if(err >= 0)
- len = err;
- sockfd_put(sock);
- }
- unlock_kernel();
- if(uaddr != NULL && err >= 0)
- err = move_addr_to_user(addr, kern_msg.msg_namelen, uaddr, uaddr_len);
- if(err >= 0) {
- err = __put_user(linux_to_solaris_msgflags(kern_msg.msg_flags), &user_msg->msg_flags);
- if(!err) {
- /* XXX Convert cmsg back into userspace 32-bit format... */
- err = __put_user((unsigned long)kern_msg.msg_control - cmsg_ptr,
- &user_msg->msg_controllen);
- }
- }
- if(kern_msg.msg_iov != iov)
- kfree(kern_msg.msg_iov);
- out:
- if(err < 0)
- return err;
- return len;
- }