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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/smbfs/sock.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'fs/smbfs/sock.c')
-rw-r--r-- | fs/smbfs/sock.c | 388 |
1 files changed, 388 insertions, 0 deletions
diff --git a/fs/smbfs/sock.c b/fs/smbfs/sock.c new file mode 100644 index 0000000..93f3cd2 --- /dev/null +++ b/fs/smbfs/sock.c @@ -0,0 +1,388 @@ +/* + * sock.c + * + * Copyright (C) 1995, 1996 by Paal-Kr. Engstad and Volker Lendecke + * Copyright (C) 1997 by Volker Lendecke + * + * Please add a note about your changes to smbfs in the ChangeLog file. + */ + +#include <linux/fs.h> +#include <linux/time.h> +#include <linux/errno.h> +#include <linux/socket.h> +#include <linux/fcntl.h> +#include <linux/file.h> +#include <linux/in.h> +#include <linux/net.h> +#include <linux/tcp.h> +#include <linux/mm.h> +#include <linux/netdevice.h> +#include <linux/smp_lock.h> +#include <linux/workqueue.h> +#include <net/scm.h> +#include <net/ip.h> + +#include <linux/smb_fs.h> +#include <linux/smb.h> +#include <linux/smbno.h> + +#include <asm/uaccess.h> +#include <asm/ioctls.h> + +#include "smb_debug.h" +#include "proto.h" +#include "request.h" + + +static int +_recvfrom(struct socket *socket, unsigned char *ubuf, int size, unsigned flags) +{ + struct kvec iov = {ubuf, size}; + struct msghdr msg = {.msg_flags = flags}; + msg.msg_flags |= MSG_DONTWAIT | MSG_NOSIGNAL; + return kernel_recvmsg(socket, &msg, &iov, 1, size, msg.msg_flags); +} + +/* + * Return the server this socket belongs to + */ +static struct smb_sb_info * +server_from_socket(struct socket *socket) +{ + return socket->sk->sk_user_data; +} + +/* + * Called when there is data on the socket. + */ +void +smb_data_ready(struct sock *sk, int len) +{ + struct smb_sb_info *server = server_from_socket(sk->sk_socket); + void (*data_ready)(struct sock *, int) = server->data_ready; + + data_ready(sk, len); + VERBOSE("(%p, %d)\n", sk, len); + smbiod_wake_up(); +} + +int +smb_valid_socket(struct inode * inode) +{ + return (inode && S_ISSOCK(inode->i_mode) && + SOCKET_I(inode)->type == SOCK_STREAM); +} + +static struct socket * +server_sock(struct smb_sb_info *server) +{ + struct file *file; + + if (server && (file = server->sock_file)) + { +#ifdef SMBFS_PARANOIA + if (!smb_valid_socket(file->f_dentry->d_inode)) + PARANOIA("bad socket!\n"); +#endif + return SOCKET_I(file->f_dentry->d_inode); + } + return NULL; +} + +void +smb_close_socket(struct smb_sb_info *server) +{ + struct file * file = server->sock_file; + + if (file) { + struct socket *sock = server_sock(server); + + VERBOSE("closing socket %p\n", sock); + sock->sk->sk_data_ready = server->data_ready; + server->sock_file = NULL; + fput(file); + } +} + +static int +smb_get_length(struct socket *socket, unsigned char *header) +{ + int result; + + result = _recvfrom(socket, header, 4, MSG_PEEK); + if (result == -EAGAIN) + return -ENODATA; + if (result < 0) { + PARANOIA("recv error = %d\n", -result); + return result; + } + if (result < 4) + return -ENODATA; + + switch (header[0]) { + case 0x00: + case 0x82: + break; + + case 0x85: + DEBUG1("Got SESSION KEEP ALIVE\n"); + _recvfrom(socket, header, 4, 0); /* read away */ + return -ENODATA; + + default: + PARANOIA("Invalid NBT packet, code=%x\n", header[0]); + return -EIO; + } + + /* The length in the RFC NB header is the raw data length */ + return smb_len(header); +} + +int +smb_recv_available(struct smb_sb_info *server) +{ + mm_segment_t oldfs; + int avail, err; + struct socket *sock = server_sock(server); + + oldfs = get_fs(); + set_fs(get_ds()); + err = sock->ops->ioctl(sock, SIOCINQ, (unsigned long) &avail); + set_fs(oldfs); + return (err >= 0) ? avail : err; +} + +/* + * Adjust the kvec to move on 'n' bytes (from nfs/sunrpc) + */ +static int +smb_move_iov(struct kvec **data, size_t *num, struct kvec *vec, unsigned amount) +{ + struct kvec *iv = *data; + int i; + int len; + + /* + * Eat any sent kvecs + */ + while (iv->iov_len <= amount) { + amount -= iv->iov_len; + iv++; + (*num)--; + } + + /* + * And chew down the partial one + */ + vec[0].iov_len = iv->iov_len-amount; + vec[0].iov_base =((unsigned char *)iv->iov_base)+amount; + iv++; + + len = vec[0].iov_len; + + /* + * And copy any others + */ + for (i = 1; i < *num; i++) { + vec[i] = *iv++; + len += vec[i].iov_len; + } + + *data = vec; + return len; +} + +/* + * smb_receive_header + * Only called by the smbiod thread. + */ +int +smb_receive_header(struct smb_sb_info *server) +{ + struct socket *sock; + int result = 0; + unsigned char peek_buf[4]; + + result = -EIO; + sock = server_sock(server); + if (!sock) + goto out; + if (sock->sk->sk_state != TCP_ESTABLISHED) + goto out; + + if (!server->smb_read) { + result = smb_get_length(sock, peek_buf); + if (result < 0) { + if (result == -ENODATA) + result = 0; + goto out; + } + server->smb_len = result + 4; + + if (server->smb_len < SMB_HEADER_LEN) { + PARANOIA("short packet: %d\n", result); + server->rstate = SMB_RECV_DROP; + result = -EIO; + goto out; + } + if (server->smb_len > SMB_MAX_PACKET_SIZE) { + PARANOIA("long packet: %d\n", result); + server->rstate = SMB_RECV_DROP; + result = -EIO; + goto out; + } + } + + result = _recvfrom(sock, server->header + server->smb_read, + SMB_HEADER_LEN - server->smb_read, 0); + VERBOSE("_recvfrom: %d\n", result); + if (result < 0) { + VERBOSE("receive error: %d\n", result); + goto out; + } + server->smb_read += result; + + if (server->smb_read == SMB_HEADER_LEN) + server->rstate = SMB_RECV_HCOMPLETE; +out: + return result; +} + +static char drop_buffer[PAGE_SIZE]; + +/* + * smb_receive_drop - read and throw away the data + * Only called by the smbiod thread. + * + * FIXME: we are in the kernel, could we just tell the socket that we want + * to drop stuff from the buffer? + */ +int +smb_receive_drop(struct smb_sb_info *server) +{ + struct socket *sock; + unsigned int flags; + struct kvec iov; + struct msghdr msg; + int rlen = smb_len(server->header) - server->smb_read + 4; + int result = -EIO; + + if (rlen > PAGE_SIZE) + rlen = PAGE_SIZE; + + sock = server_sock(server); + if (!sock) + goto out; + if (sock->sk->sk_state != TCP_ESTABLISHED) + goto out; + + flags = MSG_DONTWAIT | MSG_NOSIGNAL; + iov.iov_base = drop_buffer; + iov.iov_len = PAGE_SIZE; + msg.msg_flags = flags; + msg.msg_name = NULL; + msg.msg_namelen = 0; + msg.msg_control = NULL; + + result = kernel_recvmsg(sock, &msg, &iov, 1, rlen, flags); + + VERBOSE("read: %d\n", result); + if (result < 0) { + VERBOSE("receive error: %d\n", result); + goto out; + } + server->smb_read += result; + + if (server->smb_read >= server->smb_len) + server->rstate = SMB_RECV_END; + +out: + return result; +} + +/* + * smb_receive + * Only called by the smbiod thread. + */ +int +smb_receive(struct smb_sb_info *server, struct smb_request *req) +{ + struct socket *sock; + unsigned int flags; + struct kvec iov[4]; + struct kvec *p = req->rq_iov; + size_t num = req->rq_iovlen; + struct msghdr msg; + int rlen; + int result = -EIO; + + sock = server_sock(server); + if (!sock) + goto out; + if (sock->sk->sk_state != TCP_ESTABLISHED) + goto out; + + flags = MSG_DONTWAIT | MSG_NOSIGNAL; + msg.msg_flags = flags; + msg.msg_name = NULL; + msg.msg_namelen = 0; + msg.msg_control = NULL; + + /* Dont repeat bytes and count available bufferspace */ + rlen = smb_move_iov(&p, &num, iov, req->rq_bytes_recvd); + if (req->rq_rlen < rlen) + rlen = req->rq_rlen; + + result = kernel_recvmsg(sock, &msg, p, num, rlen, flags); + + VERBOSE("read: %d\n", result); + if (result < 0) { + VERBOSE("receive error: %d\n", result); + goto out; + } + req->rq_bytes_recvd += result; + server->smb_read += result; + +out: + return result; +} + +/* + * Try to send a SMB request. This may return after sending only parts of the + * request. SMB_REQ_TRANSMITTED will be set if a request was fully sent. + * + * Parts of this was taken from xprt_sendmsg from net/sunrpc/xprt.c + */ +int +smb_send_request(struct smb_request *req) +{ + struct smb_sb_info *server = req->rq_server; + struct socket *sock; + struct msghdr msg = {.msg_flags = MSG_NOSIGNAL | MSG_DONTWAIT}; + int slen = req->rq_slen - req->rq_bytes_sent; + int result = -EIO; + struct kvec iov[4]; + struct kvec *p = req->rq_iov; + size_t num = req->rq_iovlen; + + sock = server_sock(server); + if (!sock) + goto out; + if (sock->sk->sk_state != TCP_ESTABLISHED) + goto out; + + /* Dont repeat bytes */ + if (req->rq_bytes_sent) + smb_move_iov(&p, &num, iov, req->rq_bytes_sent); + + result = kernel_sendmsg(sock, &msg, p, num, slen); + + if (result >= 0) { + req->rq_bytes_sent += result; + if (req->rq_bytes_sent >= req->rq_slen) + req->rq_flags |= SMB_REQ_TRANSMITTED; + } +out: + return result; +} |