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- /*
- * NET An implementation of the SOCKET network access protocol.
- *
- * Version: @(#)socket.c 1.0.5 05/25/93
- *
- * Authors: Orest Zborowski, <obz@Kodak.COM>
- * Ross Biro, <bir7@leland.Stanford.Edu>
- * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
- *
- * Fixes:
- * Anonymous : NOTSOCK/BADF cleanup. Error fix in
- * shutdown()
- * Alan Cox : verify_area() fixes
- *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
- #include <linux/config.h>
- #include <linux/signal.h>
- #include <linux/errno.h>
- #include <linux/sched.h>
- #include <linux/kernel.h>
- #include <linux/major.h>
- #include <linux/stat.h>
- #include <linux/socket.h>
- #include <linux/fcntl.h>
- #include <linux/net.h>
- #include <linux/ddi.h>
-
- #include <asm/system.h>
- #include <asm/segment.h>
-
- #undef SOCK_DEBUG
-
- #ifdef SOCK_DEBUG
- #include <stdarg.h>
- #define DPRINTF(x) dprintf x
- #else
- #define DPRINTF(x) /**/
- #endif
-
- static int sock_lseek(struct inode *inode, struct file *file, off_t offset,
- int whence);
- static int sock_read(struct inode *inode, struct file *file, char *buf,
- int size);
- static int sock_write(struct inode *inode, struct file *file, char *buf,
- int size);
- static int sock_readdir(struct inode *inode, struct file *file,
- struct dirent *dirent, int count);
- static void sock_close(struct inode *inode, struct file *file);
- static int sock_select(struct inode *inode, struct file *file, int which, select_table *seltable);
- static int sock_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg);
-
-
- static struct file_operations socket_file_ops = {
- sock_lseek,
- sock_read,
- sock_write,
- sock_readdir,
- sock_select,
- sock_ioctl,
- NULL, /* mmap */
- NULL, /* no special open code... */
- sock_close
- };
-
- static struct socket sockets[NSOCKETS];
- static struct wait_queue *socket_wait_free = NULL;
- static struct proto_ops *pops[NPROTO];
- static int net_debug = 0;
-
- #define last_socket (sockets + NSOCKETS - 1)
-
- #ifdef SOCK_DEBUG
- /* Module debugging. */
- static void
- dprintf(int level, char *fmt, ...)
- {
- char buff[1024];
- va_list args;
- extern int vsprintf(char * buf, const char * fmt, va_list args);
-
- if (level == 0) return;
- va_start(args, fmt);
- vsprintf(buff, fmt, args);
- va_end(args);
- printk(buff);
- }
- #endif
-
- /* Obtains the first available file descriptor and sets it up for use. */
- static int
- get_fd(struct inode *inode)
- {
- int fd;
- struct file *file;
-
- /* Find a file descriptor suitable for return to the user. */
- file = get_empty_filp();
- if (!file) return(-1);
- for (fd = 0; fd < NR_OPEN; ++fd)
- if (!current->filp[fd]) break;
- if (fd == NR_OPEN) {
- file->f_count = 0;
- return(-1);
- }
- FD_CLR(fd, ¤t->close_on_exec);
- current->filp[fd] = file;
- file->f_op = &socket_file_ops;
- file->f_mode = 3;
- file->f_flags = 0;
- file->f_count = 1;
- file->f_inode = inode;
- if (inode) inode->i_count++;
- file->f_pos = 0;
- return(fd);
- }
-
-
- /*
- * Reverses the action of get_fd() by releasing the file. it closes
- * the descriptor, but makes sure it does nothing more. Called when
- * an incomplete socket must be closed, along with sock_release().
- */
- static inline void
- toss_fd(int fd)
- {
- sys_close(fd); /* the count protects us from iput */
- }
-
-
- struct socket *
- socki_lookup(struct inode *inode)
- {
- struct socket *sock;
-
- if ((sock = inode->i_socket) != NULL) {
- if (sock->state != SS_FREE && SOCK_INODE(sock) == inode)
- return sock;
- printk("socket.c: uhhuh. stale inode->i_socket pointer\n");
- }
- for (sock = sockets; sock <= last_socket; ++sock)
- if (sock->state != SS_FREE && SOCK_INODE(sock) == inode) {
- printk("socket.c: uhhuh. Found socket despite no inode->i_socket pointer\n");
- return(sock);
- }
- return(NULL);
- }
-
-
- static inline struct socket *
- sockfd_lookup(int fd, struct file **pfile)
- {
- struct file *file;
-
- if (fd < 0 || fd >= NR_OPEN || !(file = current->filp[fd])) return(NULL);
- if (pfile) *pfile = file;
- return(socki_lookup(file->f_inode));
- }
-
-
- static struct socket *
- sock_alloc(int wait)
- {
- struct socket *sock;
-
- while (1) {
- cli();
- for (sock = sockets; sock <= last_socket; ++sock) {
- if (sock->state == SS_FREE) {
- sock->state = SS_UNCONNECTED;
- sti();
- sock->flags = 0;
- sock->ops = NULL;
- sock->data = NULL;
- sock->conn = NULL;
- sock->iconn = NULL;
-
- /*
- * This really shouldn't be necessary, but everything
- * else depends on inodes, so we grab it.
- * Sleeps are also done on the i_wait member of this
- * inode. The close system call will iput this inode
- * for us.
- */
- if (!(SOCK_INODE(sock) = get_empty_inode())) {
- printk("NET: sock_alloc: no more inodes\n");
- sock->state = SS_FREE;
- return(NULL);
- }
- SOCK_INODE(sock)->i_mode = S_IFSOCK;
- SOCK_INODE(sock)->i_uid = current->euid;
- SOCK_INODE(sock)->i_gid = current->egid;
- SOCK_INODE(sock)->i_socket = sock;
-
- sock->wait = &SOCK_INODE(sock)->i_wait;
- DPRINTF((net_debug,
- "NET: sock_alloc: sk 0x%x, ino 0x%x\n",
- sock, SOCK_INODE(sock)));
- return(sock);
- }
- }
- sti();
- if (!wait) return(NULL);
- DPRINTF((net_debug, "NET: sock_alloc: no free sockets, sleeping...\n"));
- interruptible_sleep_on(&socket_wait_free);
- if (current->signal & ~current->blocked) {
- DPRINTF((net_debug, "NET: sock_alloc: sleep was interrupted\n"));
- return(NULL);
- }
- DPRINTF((net_debug, "NET: sock_alloc: wakeup... trying again...\n"));
- }
- }
-
-
- static inline void
- sock_release_peer(struct socket *peer)
- {
- peer->state = SS_DISCONNECTING;
- wake_up_interruptible(peer->wait);
- }
-
-
- static void
- sock_release(struct socket *sock)
- {
- int oldstate;
- struct inode *inode;
- struct socket *peersock, *nextsock;
-
- DPRINTF((net_debug, "NET: sock_release: socket 0x%x, inode 0x%x\n",
- sock, SOCK_INODE(sock)));
- if ((oldstate = sock->state) != SS_UNCONNECTED)
- sock->state = SS_DISCONNECTING;
-
- /* Wake up anyone waiting for connections. */
- for (peersock = sock->iconn; peersock; peersock = nextsock) {
- nextsock = peersock->next;
- sock_release_peer(peersock);
- }
-
- /*
- * Wake up anyone we're connected to. First, we release the
- * protocol, to give it a chance to flush data, etc.
- */
- peersock = (oldstate == SS_CONNECTED) ? sock->conn : NULL;
- if (sock->ops) sock->ops->release(sock, peersock);
- if (peersock) sock_release_peer(peersock);
- inode = SOCK_INODE(sock);
- sock->state = SS_FREE; /* this really releases us */
- wake_up_interruptible(&socket_wait_free);
-
- /* We need to do this. If sock alloc was called we already have an inode. */
- iput(inode);
- }
-
-
- static int
- sock_lseek(struct inode *inode, struct file *file, off_t offset, int whence)
- {
- DPRINTF((net_debug, "NET: sock_lseek: huh?\n"));
- return(-ESPIPE);
- }
-
-
- static int
- sock_read(struct inode *inode, struct file *file, char *ubuf, int size)
- {
- struct socket *sock;
-
- DPRINTF((net_debug, "NET: sock_read: buf=0x%x, size=%d\n", ubuf, size));
- if (!(sock = socki_lookup(inode))) {
- printk("NET: sock_read: can't find socket for inode!\n");
- return(-EBADF);
- }
- if (sock->flags & SO_ACCEPTCON) return(-EINVAL);
- return(sock->ops->read(sock, ubuf, size, (file->f_flags & O_NONBLOCK)));
- }
-
-
- static int
- sock_write(struct inode *inode, struct file *file, char *ubuf, int size)
- {
- struct socket *sock;
-
- DPRINTF((net_debug, "NET: sock_write: buf=0x%x, size=%d\n", ubuf, size));
- if (!(sock = socki_lookup(inode))) {
- printk("NET: sock_write: can't find socket for inode!\n");
- return(-EBADF);
- }
- if (sock->flags & SO_ACCEPTCON) return(-EINVAL);
- return(sock->ops->write(sock, ubuf, size,(file->f_flags & O_NONBLOCK)));
- }
-
-
- static int
- sock_readdir(struct inode *inode, struct file *file, struct dirent *dirent,
- int count)
- {
- DPRINTF((net_debug, "NET: sock_readdir: huh?\n"));
- return(-EBADF);
- }
-
-
- int
- sock_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
- unsigned long arg)
- {
- struct socket *sock;
-
- DPRINTF((net_debug, "NET: sock_ioctl: inode=0x%x cmd=0x%x arg=%d\n",
- inode, cmd, arg));
- if (!(sock = socki_lookup(inode))) {
- printk("NET: sock_ioctl: can't find socket for inode!\n");
- return(-EBADF);
- }
- return(sock->ops->ioctl(sock, cmd, arg));
- }
-
-
- static int
- sock_select(struct inode *inode, struct file *file, int sel_type, select_table * wait)
- {
- struct socket *sock;
-
- DPRINTF((net_debug, "NET: sock_select: inode = 0x%x, kind = %s\n", inode,
- (sel_type == SEL_IN) ? "in" :
- (sel_type == SEL_OUT) ? "out" : "ex"));
- if (!(sock = socki_lookup(inode))) {
- printk("NET: sock_select: can't find socket for inode!\n");
- return(0);
- }
-
- /* We can't return errors to select, so its either yes or no. */
- if (sock->ops && sock->ops->select)
- return(sock->ops->select(sock, sel_type, wait));
- return(0);
- }
-
-
- void
- sock_close(struct inode *inode, struct file *file)
- {
- struct socket *sock;
-
- DPRINTF((net_debug, "NET: sock_close: inode=0x%x (cnt=%d)\n",
- inode, inode->i_count));
-
- /* It's possible the inode is NULL if we're closing an unfinished socket. */
- if (!inode) return;
- if (!(sock = socki_lookup(inode))) {
- printk("NET: sock_close: can't find socket for inode!\n");
- return;
- }
- sock_release(sock);
- }
-
-
- int
- sock_awaitconn(struct socket *mysock, struct socket *servsock)
- {
- struct socket *last;
-
- DPRINTF((net_debug,
- "NET: sock_awaitconn: trying to connect socket 0x%x to 0x%x\n",
- mysock, servsock));
- if (!(servsock->flags & SO_ACCEPTCON)) {
- DPRINTF((net_debug,
- "NET: sock_awaitconn: server not accepting connections\n"));
- return(-EINVAL);
- }
-
- /* Put ourselves on the server's incomplete connection queue. */
- mysock->next = NULL;
- cli();
- if (!(last = servsock->iconn)) servsock->iconn = mysock;
- else {
- while (last->next) last = last->next;
- last->next = mysock;
- }
- mysock->state = SS_CONNECTING;
- mysock->conn = servsock;
- sti();
-
- /*
- * Wake up server, then await connection. server will set state to
- * SS_CONNECTED if we're connected.
- */
- wake_up_interruptible(servsock->wait);
- if (mysock->state != SS_CONNECTED) {
- interruptible_sleep_on(mysock->wait);
- if (mysock->state != SS_CONNECTED &&
- mysock->state != SS_DISCONNECTING) {
- /*
- * if we're not connected we could have been
- * 1) interrupted, so we need to remove ourselves
- * from the server list
- * 2) rejected (mysock->conn == NULL), and have
- * already been removed from the list
- */
- if (mysock->conn == servsock) {
- cli();
- if ((last = servsock->iconn) == mysock)
- servsock->iconn = mysock->next;
- else {
- while (last->next != mysock) last = last->next;
- last->next = mysock->next;
- }
- sti();
- }
- return(mysock->conn ? -EINTR : -EACCES);
- }
- }
- return(0);
- }
-
-
- /*
- * Perform the socket system call. we locate the appropriate
- * family, then create a fresh socket.
- */
- static int
- sock_socket(int family, int type, int protocol)
- {
- int i, fd;
- struct socket *sock;
- struct proto_ops *ops;
-
- DPRINTF((net_debug,
- "NET: sock_socket: family = %d, type = %d, protocol = %d\n",
- family, type, protocol));
-
- /* Locate the correct protocol family. */
- for (i = 0; i < NPROTO; ++i) {
- if (pops[i] == NULL) continue;
- if (pops[i]->family == family) break;
- }
- if (i == NPROTO) {
- DPRINTF((net_debug, "NET: sock_socket: family not found\n"));
- return(-EINVAL);
- }
- ops = pops[i];
-
- /*
- * Check that this is a type that we know how to manipulate and
- * the protocol makes sense here. The family can still reject the
- * protocol later.
- */
- if ((type != SOCK_STREAM && type != SOCK_DGRAM &&
- type != SOCK_SEQPACKET && type != SOCK_RAW &&
- type != SOCK_PACKET) || protocol < 0)
- return(-EINVAL);
-
- /*
- * 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(1))) {
- printk("sock_socket: no more sockets\n");
- return(-EAGAIN);
- }
- sock->type = type;
- sock->ops = ops;
- if ((i = sock->ops->create(sock, protocol)) < 0) {
- sock_release(sock);
- return(i);
- }
-
- if ((fd = get_fd(SOCK_INODE(sock))) < 0) {
- sock_release(sock);
- return(-EINVAL);
- }
-
- return(fd);
- }
-
-
- static int
- sock_socketpair(int family, int type, int protocol, unsigned long usockvec[2])
- {
- int fd1, fd2, i;
- struct socket *sock1, *sock2;
- int er;
-
- DPRINTF((net_debug,
- "NET: sock_socketpair: family = %d, type = %d, protocol = %d\n",
- family, type, protocol));
-
- /*
- * Obtain the first socket and check if the underlying protocol
- * supports the socketpair call.
- */
- if ((fd1 = sock_socket(family, type, protocol)) < 0) return(fd1);
- sock1 = sockfd_lookup(fd1, NULL);
- if (!sock1->ops->socketpair) {
- sys_close(fd1);
- return(-EINVAL);
- }
-
- /* Now grab another socket and try to connect the two together. */
- if ((fd2 = sock_socket(family, type, protocol)) < 0) {
- sys_close(fd1);
- return(-EINVAL);
- }
- sock2 = sockfd_lookup(fd2, NULL);
- if ((i = sock1->ops->socketpair(sock1, sock2)) < 0) {
- sys_close(fd1);
- sys_close(fd2);
- return(i);
- }
- sock1->conn = sock2;
- sock2->conn = sock1;
- sock1->state = SS_CONNECTED;
- sock2->state = SS_CONNECTED;
-
- er=verify_area(VERIFY_WRITE, usockvec, 2 * sizeof(int));
- if(er)
- return er;
- put_fs_long(fd1, &usockvec[0]);
- put_fs_long(fd2, &usockvec[1]);
-
- return(0);
- }
-
-
- /*
- * Bind a name to a socket. Nothing much to do here since its
- * the protocol's responsibility to handle the local address.
- */
- static int
- sock_bind(int fd, struct sockaddr *umyaddr, int addrlen)
- {
- struct socket *sock;
- int i;
-
- DPRINTF((net_debug, "NET: sock_bind: fd = %d\n", fd));
- if (fd < 0 || fd >= NR_OPEN || current->filp[fd] == NULL)
- return(-EBADF);
- if (!(sock = sockfd_lookup(fd, NULL))) return(-ENOTSOCK);
- if ((i = sock->ops->bind(sock, umyaddr, addrlen)) < 0) {
- DPRINTF((net_debug, "NET: sock_bind: bind failed\n"));
- return(i);
- }
- return(0);
- }
-
-
- /*
- * 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.
- */
- static int
- sock_listen(int fd, int backlog)
- {
- struct socket *sock;
-
- DPRINTF((net_debug, "NET: sock_listen: fd = %d\n", fd));
- if (fd < 0 || fd >= NR_OPEN || current->filp[fd] == NULL)
- return(-EBADF);
- if (!(sock = sockfd_lookup(fd, NULL))) return(-ENOTSOCK);
- if (sock->state != SS_UNCONNECTED) {
- DPRINTF((net_debug, "NET: sock_listen: socket isn't unconnected\n"));
- return(-EINVAL);
- }
- if (sock->ops && sock->ops->listen) sock->ops->listen(sock, backlog);
- sock->flags |= SO_ACCEPTCON;
- return(0);
- }
-
-
- /*
- * For accept, we attempt to create a new socket, set up the link
- * with the client, wake up the client, then return the new
- * connected fd.
- */
- static int
- sock_accept(int fd, struct sockaddr *upeer_sockaddr, int *upeer_addrlen)
- {
- struct file *file;
- struct socket *sock, *newsock;
- int i;
-
- DPRINTF((net_debug, "NET: sock_accept: fd = %d\n", fd));
- if (fd < 0 || fd >= NR_OPEN || ((file = current->filp[fd]) == NULL))
- return(-EBADF);
-
- if (!(sock = sockfd_lookup(fd, &file))) return(-ENOTSOCK);
- if (sock->state != SS_UNCONNECTED) {
- DPRINTF((net_debug, "NET: sock_accept: socket isn't unconnected\n"));
- return(-EINVAL);
- }
- if (!(sock->flags & SO_ACCEPTCON)) {
- DPRINTF((net_debug,
- "NET: sock_accept: socket not accepting connections!\n"));
- return(-EINVAL);
- }
-
- if (!(newsock = sock_alloc(0))) {
- printk("NET: sock_accept: no more sockets\n");
- return(-EAGAIN);
- }
- newsock->type = sock->type;
- newsock->ops = sock->ops;
- if ((i = sock->ops->dup(newsock, sock)) < 0) {
- sock_release(newsock);
- return(i);
- }
-
- i = newsock->ops->accept(sock, newsock, file->f_flags);
- if ( i < 0) {
- sock_release(newsock);
- return(i);
- }
-
- if ((fd = get_fd(SOCK_INODE(newsock))) < 0) {
- sock_release(newsock);
- return(-EINVAL);
- }
-
- DPRINTF((net_debug, "NET: sock_accept: connected socket 0x%x via 0x%x\n",
- sock, newsock));
-
- if (upeer_sockaddr)
- newsock->ops->getname(newsock, upeer_sockaddr, upeer_addrlen, 1);
-
- return(fd);
- }
-
-
- /* Attempt to connect to a socket with the server address. */
- static int
- sock_connect(int fd, struct sockaddr *uservaddr, int addrlen)
- {
- struct socket *sock;
- struct file *file;
- int i;
-
- DPRINTF((net_debug, "NET: sock_connect: fd = %d\n", fd));
- if (fd < 0 || fd >= NR_OPEN || (file=current->filp[fd]) == NULL)
- return(-EBADF);
-
- if (!(sock = sockfd_lookup(fd, &file))) return(-ENOTSOCK);
- switch(sock->state) {
- case SS_UNCONNECTED:
- /* This is ok... continue with connect */
- break;
- case SS_CONNECTED:
- /* Socket is already connected */
- return -EISCONN;
- case SS_CONNECTING:
- /* Not yet connected... we will check this. */
- return(sock->ops->connect(sock, uservaddr,
- addrlen, file->f_flags));
- default:
- DPRINTF((net_debug,
- "NET: sock_connect: socket not unconnected\n"));
- return(-EINVAL);
- }
- i = sock->ops->connect(sock, uservaddr, addrlen, file->f_flags);
- if (i < 0) {
- DPRINTF((net_debug, "NET: sock_connect: connect failed\n"));
- return(i);
- }
- return(0);
- }
-
-
- static int
- sock_getsockname(int fd, struct sockaddr *usockaddr, int *usockaddr_len)
- {
- struct socket *sock;
-
- DPRINTF((net_debug, "NET: sock_getsockname: fd = %d\n", fd));
- if (fd < 0 || fd >= NR_OPEN || current->filp[fd] == NULL)
- return(-EBADF);
- if (!(sock = sockfd_lookup(fd, NULL))) return(-ENOTSOCK);
- return(sock->ops->getname(sock, usockaddr, usockaddr_len, 0));
- }
-
-
- static int
- sock_getpeername(int fd, struct sockaddr *usockaddr, int *usockaddr_len)
- {
- struct socket *sock;
-
- DPRINTF((net_debug, "NET: sock_getpeername: fd = %d\n", fd));
- if (fd < 0 || fd >= NR_OPEN || current->filp[fd] == NULL)
- return(-EBADF);
- if (!(sock = sockfd_lookup(fd, NULL))) return(-ENOTSOCK);
- return(sock->ops->getname(sock, usockaddr, usockaddr_len, 1));
- }
-
-
- static int
- sock_send(int fd, void * buff, int len, unsigned flags)
- {
- struct socket *sock;
- struct file *file;
-
- DPRINTF((net_debug,
- "NET: sock_send(fd = %d, buff = %X, len = %d, flags = %X)\n",
- fd, buff, len, flags));
-
- if (fd < 0 || fd >= NR_OPEN || ((file = current->filp[fd]) == NULL))
- return(-EBADF);
- if (!(sock = sockfd_lookup(fd, NULL))) return(-ENOTSOCK);
-
- return(sock->ops->send(sock, buff, len, (file->f_flags & O_NONBLOCK), flags));
- }
-
-
- static int
- sock_sendto(int fd, void * buff, int len, unsigned flags,
- struct sockaddr *addr, int addr_len)
- {
- struct socket *sock;
- struct file *file;
-
- DPRINTF((net_debug,
- "NET: sock_sendto(fd = %d, buff = %X, len = %d, flags = %X,"
- " addr=%X, alen = %d\n", fd, buff, len, flags, addr, addr_len));
-
- if (fd < 0 || fd >= NR_OPEN || ((file = current->filp[fd]) == NULL))
- return(-EBADF);
- if (!(sock = sockfd_lookup(fd, NULL))) return(-ENOTSOCK);
-
- return(sock->ops->sendto(sock, buff, len, (file->f_flags & O_NONBLOCK),
- flags, addr, addr_len));
- }
-
-
- static int
- sock_recv(int fd, void * buff, int len, unsigned flags)
- {
- struct socket *sock;
- struct file *file;
-
- DPRINTF((net_debug,
- "NET: sock_recv(fd = %d, buff = %X, len = %d, flags = %X)\n",
- fd, buff, len, flags));
-
- if (fd < 0 || fd >= NR_OPEN || ((file = current->filp[fd]) == NULL))
- return(-EBADF);
- if (!(sock = sockfd_lookup(fd, NULL))) return(-ENOTSOCK);
-
- return(sock->ops->recv(sock, buff, len,(file->f_flags & O_NONBLOCK), flags));
- }
-
-
- static int
- sock_recvfrom(int fd, void * buff, int len, unsigned flags,
- struct sockaddr *addr, int *addr_len)
- {
- struct socket *sock;
- struct file *file;
-
- DPRINTF((net_debug,
- "NET: sock_recvfrom(fd = %d, buff = %X, len = %d, flags = %X,"
- " addr=%X, alen=%X\n", fd, buff, len, flags, addr, addr_len));
-
- if (fd < 0 || fd >= NR_OPEN || ((file = current->filp[fd]) == NULL))
- return(-EBADF);
- if (!(sock = sockfd_lookup(fd, NULL))) return(-ENOTSOCK);
-
- return(sock->ops->recvfrom(sock, buff, len, (file->f_flags & O_NONBLOCK),
- flags, addr, addr_len));
- }
-
-
- static int
- sock_setsockopt(int fd, int level, int optname, char *optval, int optlen)
- {
- struct socket *sock;
- struct file *file;
-
- DPRINTF((net_debug, "NET: sock_setsockopt(fd=%d, level=%d, optname=%d,\n",
- fd, level, optname));
- DPRINTF((net_debug, " optval = %X, optlen = %d)\n",
- optval, optlen));
-
- if (fd < 0 || fd >= NR_OPEN || ((file = current->filp[fd]) == NULL))
- return(-EBADF);
- if (!(sock = sockfd_lookup(fd, NULL))) return(-ENOTSOCK);
-
- return(sock->ops->setsockopt(sock, level, optname, optval, optlen));
- }
-
-
- static int
- sock_getsockopt(int fd, int level, int optname, char *optval, int *optlen)
- {
- struct socket *sock;
- struct file *file;
-
- DPRINTF((net_debug, "NET: sock_getsockopt(fd=%d, level=%d, optname=%d,\n",
- fd, level, optname));
- DPRINTF((net_debug, " optval = %X, optlen = %X)\n",
- optval, optlen));
-
- if (fd < 0 || fd >= NR_OPEN || ((file = current->filp[fd]) == NULL))
- return(-EBADF);
- if (!(sock = sockfd_lookup(fd, NULL))) return(-ENOTSOCK);
-
- if (!sock->ops || !sock->ops->getsockopt) return(0);
- return(sock->ops->getsockopt(sock, level, optname, optval, optlen));
- }
-
-
- static int
- sock_shutdown(int fd, int how)
- {
- struct socket *sock;
- struct file *file;
-
- DPRINTF((net_debug, "NET: sock_shutdown(fd = %d, how = %d)\n", fd, how));
-
- if (fd < 0 || fd >= NR_OPEN || ((file = current->filp[fd]) == NULL))
- return(-EBADF);
-
- if (!(sock = sockfd_lookup(fd, NULL))) return(-ENOTSOCK);
-
- return(sock->ops->shutdown(sock, how));
- }
-
-
- int
- sock_fcntl(struct file *filp, unsigned int cmd, unsigned long arg)
- {
- struct socket *sock;
-
- sock = socki_lookup (filp->f_inode);
- if (sock != NULL && sock->ops != NULL && sock->ops->fcntl != NULL)
- return(sock->ops->fcntl(sock, cmd, arg));
- return(-EINVAL);
- }
-
-
- /*
- * System call vectors. Since I (RIB) want to rewrite sockets as streams,
- * we have this level of indirection. Not a lot of overhead, since more of
- * the work is done via read/write/select directly.
- */
- asmlinkage int
- sys_socketcall(int call, unsigned long *args)
- {
- int er;
- switch(call) {
- case SYS_SOCKET:
- er=verify_area(VERIFY_READ, args, 3 * sizeof(long));
- if(er)
- return er;
- return(sock_socket(get_fs_long(args+0),
- get_fs_long(args+1),
- get_fs_long(args+2)));
- case SYS_BIND:
- er=verify_area(VERIFY_READ, args, 3 * sizeof(long));
- if(er)
- return er;
- return(sock_bind(get_fs_long(args+0),
- (struct sockaddr *)get_fs_long(args+1),
- get_fs_long(args+2)));
- case SYS_CONNECT:
- er=verify_area(VERIFY_READ, args, 3 * sizeof(long));
- if(er)
- return er;
- return(sock_connect(get_fs_long(args+0),
- (struct sockaddr *)get_fs_long(args+1),
- get_fs_long(args+2)));
- case SYS_LISTEN:
- er=verify_area(VERIFY_READ, args, 2 * sizeof(long));
- if(er)
- return er;
- return(sock_listen(get_fs_long(args+0),
- get_fs_long(args+1)));
- case SYS_ACCEPT:
- er=verify_area(VERIFY_READ, args, 3 * sizeof(long));
- if(er)
- return er;
- return(sock_accept(get_fs_long(args+0),
- (struct sockaddr *)get_fs_long(args+1),
- (int *)get_fs_long(args+2)));
- case SYS_GETSOCKNAME:
- er=verify_area(VERIFY_READ, args, 3 * sizeof(long));
- if(er)
- return er;
- return(sock_getsockname(get_fs_long(args+0),
- (struct sockaddr *)get_fs_long(args+1),
- (int *)get_fs_long(args+2)));
- case SYS_GETPEERNAME:
- er=verify_area(VERIFY_READ, args, 3 * sizeof(long));
- if(er)
- return er;
- return(sock_getpeername(get_fs_long(args+0),
- (struct sockaddr *)get_fs_long(args+1),
- (int *)get_fs_long(args+2)));
- case SYS_SOCKETPAIR:
- er=verify_area(VERIFY_READ, args, 4 * sizeof(long));
- if(er)
- return er;
- return(sock_socketpair(get_fs_long(args+0),
- get_fs_long(args+1),
- get_fs_long(args+2),
- (unsigned long *)get_fs_long(args+3)));
- case SYS_SEND:
- er=verify_area(VERIFY_READ, args, 4 * sizeof(unsigned long));
- if(er)
- return er;
- return(sock_send(get_fs_long(args+0),
- (void *)get_fs_long(args+1),
- get_fs_long(args+2),
- get_fs_long(args+3)));
- case SYS_SENDTO:
- er=verify_area(VERIFY_READ, args, 6 * sizeof(unsigned long));
- if(er)
- return er;
- return(sock_sendto(get_fs_long(args+0),
- (void *)get_fs_long(args+1),
- get_fs_long(args+2),
- get_fs_long(args+3),
- (struct sockaddr *)get_fs_long(args+4),
- get_fs_long(args+5)));
- case SYS_RECV:
- er=verify_area(VERIFY_READ, args, 4 * sizeof(unsigned long));
- if(er)
- return er;
- return(sock_recv(get_fs_long(args+0),
- (void *)get_fs_long(args+1),
- get_fs_long(args+2),
- get_fs_long(args+3)));
- case SYS_RECVFROM:
- er=verify_area(VERIFY_READ, args, 6 * sizeof(unsigned long));
- if(er)
- return er;
- return(sock_recvfrom(get_fs_long(args+0),
- (void *)get_fs_long(args+1),
- get_fs_long(args+2),
- get_fs_long(args+3),
- (struct sockaddr *)get_fs_long(args+4),
- (int *)get_fs_long(args+5)));
- case SYS_SHUTDOWN:
- er=verify_area(VERIFY_READ, args, 2* sizeof(unsigned long));
- if(er)
- return er;
- return(sock_shutdown(get_fs_long(args+0),
- get_fs_long(args+1)));
- case SYS_SETSOCKOPT:
- er=verify_area(VERIFY_READ, args, 5*sizeof(unsigned long));
- if(er)
- return er;
- return(sock_setsockopt(get_fs_long(args+0),
- get_fs_long(args+1),
- get_fs_long(args+2),
- (char *)get_fs_long(args+3),
- get_fs_long(args+4)));
- case SYS_GETSOCKOPT:
- er=verify_area(VERIFY_READ, args, 5*sizeof(unsigned long));
- if(er)
- return er;
- return(sock_getsockopt(get_fs_long(args+0),
- get_fs_long(args+1),
- get_fs_long(args+2),
- (char *)get_fs_long(args+3),
- (int *)get_fs_long(args+4)));
- default:
- return(-EINVAL);
- }
- }
-
-
- static int
- net_ioctl(unsigned int cmd, unsigned long arg)
- {
- int er;
- switch(cmd) {
- case DDIOCSDBG:
- er=verify_area(VERIFY_READ, (void *)arg, sizeof(long));
- if(er)
- return er;
- net_debug = get_fs_long((long *)arg);
- if (net_debug != 0 && net_debug != 1) {
- net_debug = 0;
- return(-EINVAL);
- }
- return(0);
- default:
- return(-EINVAL);
- }
- /*NOTREACHED*/
- return(0);
- }
-
-
- /*
- * Handle the IOCTL system call for the NET devices. This basically
- * means I/O control for the SOCKET layer (future expansions could be
- * a variable number of socket table entries, et al), and for the more
- * general protocols like ARP. The latter currently lives in the INET
- * module, so we have to get ugly a tiny little bit. Later... -FvK
- */
- static int
- net_fioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
- {
- extern int arp_ioctl(unsigned int, void *);
-
- /* Dispatch on the minor device. */
- switch(MINOR(inode->i_rdev)) {
- case 0: /* NET (SOCKET) */
- DPRINTF((net_debug, "NET: SOCKET level I/O control request.\n"));
- return(net_ioctl(cmd, arg));
- #ifdef CONFIG_INET
- case 1: /* ARP */
- DPRINTF((net_debug, "NET: ARP level I/O control request.\n"));
- return(arp_ioctl(cmd, (void *) arg));
- #endif
- default:
- return(-ENODEV);
- }
- /*NOTREACHED*/
- return(-EINVAL);
- }
-
-
- static struct file_operations net_fops = {
- NULL, /* LSEEK */
- NULL, /* READ */
- NULL, /* WRITE */
- NULL, /* READDIR */
- NULL, /* SELECT */
- net_fioctl, /* IOCTL */
- NULL, /* MMAP */
- NULL, /* OPEN */
- NULL /* CLOSE */
- };
-
-
- /*
- * This function is called by a protocol handler that wants to
- * advertise its address family, and have it linked into the
- * SOCKET module.
- */
- int
- sock_register(int family, struct proto_ops *ops)
- {
- int i;
-
- cli();
- for(i = 0; i < NPROTO; i++) {
- if (pops[i] != NULL) continue;
- pops[i] = ops;
- pops[i]->family = family;
- sti();
- DPRINTF((net_debug, "NET: Installed protocol %d in slot %d (0x%X)\n",
- family, i, (long)ops));
- return(i);
- }
- sti();
- return(-ENOMEM);
- }
-
-
- void
- sock_init(void)
- {
- struct socket *sock;
- int i;
-
- /* Set up our SOCKET VFS major device. */
- if (register_chrdev(SOCKET_MAJOR, "socket", &net_fops) < 0) {
- printk("NET: cannot register major device %d!\n", SOCKET_MAJOR);
- return;
- }
-
- /* Release all sockets. */
- for (sock = sockets; sock <= last_socket; ++sock) sock->state = SS_FREE;
-
- /* Initialize all address (protocol) families. */
- for (i = 0; i < NPROTO; ++i) pops[i] = NULL;
-
- /* Initialize the DDI module. */
- ddi_init();
-
- /* Initialize the ARP module. */
- #if 0
- arp_init();
- #endif
- }
-