new file mode 100644
@@ -0,0 +1,59 @@
+/*
+ * net/sunrpc/xprtsmb.h -- SMB transport for sunrpc
+ *
+ * Copyright (c) 2009 Red Hat, Inc.
+ * Author(s): Jeff Layton (jlayton@redhat.com)
+ *
+ * This library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
+ * the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/*
+ * xprtsmb.h
+ *
+ * This file contains the public interfaces for the SMB transport for
+ * the sunrpc layer.
+ */
+
+#ifndef _LINUX_SUNRPC_XPRTSMB_H
+#define _LINUX_SUNRPC_XPRTSMB_H
+
+/*
+ * RPC transport identifier for SMB
+ */
+#define XPRT_TRANSPORT_SMB 1024
+
+int init_smb_xprt(void);
+void cleanup_smb_xprt(void);
+
+/* standard SMB header */
+struct smb_header {
+ __u8 protocol[4];
+ __u8 command;
+ __le32 status;
+ __u8 flags;
+ __le16 flags2;
+ __le16 pidhigh;
+ __u8 signature[8];
+ __u8 pad[2];
+ __le16 tid;
+ __le16 pid;
+ __le16 uid;
+ __le16 mid;
+} __attribute__((packed));
+
+/* SMB Header Flags of interest */
+#define SMBFLG_RESPONSE 0x80 /* response from server */
+
+#endif /* _LINUX_SUNRPC_XPRTSMB_H */
new file mode 100644
@@ -0,0 +1,1720 @@
+/*
+ * linux/net/sunrpc/xprtsmb.c
+ *
+ * Client-side transport implementation for SMB sockets.
+ *
+ * (C) 1998 Red Hat
+ * Initial revision by Jeff Layton <jlayton@redhat.com>
+ *
+ * Heavily based on net/sunrpc/xprtsock.c -- copyrights from that file below:
+ *
+ * TCP callback races fixes (C) 1998 Red Hat
+ * TCP send fixes (C) 1998 Red Hat
+ * TCP NFS related read + write fixes
+ * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
+ *
+ * Rewrite of larges part of the code in order to stabilize TCP stuff.
+ * Fix behaviour when socket buffer is full.
+ * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
+ *
+ * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
+ *
+ * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
+ * <gilles.quillard@bull.net>
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/capability.h>
+#include <linux/pagemap.h>
+#include <linux/errno.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/net.h>
+#include <linux/mm.h>
+#include <linux/tcp.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/sched.h>
+#include <linux/sunrpc/xprtsmb.h>
+#include <linux/sunrpc/xprtsock.h>
+#include <linux/file.h>
+#ifdef CONFIG_NFS_V4_1
+#include <linux/sunrpc/bc_xprt.h>
+#endif
+
+#include <net/sock.h>
+#include <net/checksum.h>
+#include <net/tcp.h>
+
+/* CIFS currently defaults to allowing 50 outstanding calls at a time */
+#define SMB_DEF_SLOT_TABLE 50
+
+/*
+ * top byte of the 32-bit SMB "fragment header" is always 0. That gives a max
+ * size for a SMB packet of 2^24-1
+ */
+#define SMB_FRAGMENT_SIZE_MASK 0x00ffffff
+#define SMB_MAX_FRAGMENT_SIZE SMB_FRAGMENT_SIZE_MASK
+
+/*
+ * xprtsock tunables
+ */
+unsigned int xprt_smb_slot_table_entries = SMB_DEF_SLOT_TABLE;
+
+#define XS_TCP_LINGER_TO (15U * HZ)
+static unsigned int xs_smb_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
+
+/*
+ * We can register our own files under /proc/sys/sunrpc by
+ * calling register_sysctl_table() again. The files in that
+ * directory become the union of all files registered there.
+ *
+ * We simply need to make sure that we don't collide with
+ * someone else's file names!
+ */
+
+#ifdef RPC_DEBUG
+
+static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
+static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
+
+static struct ctl_table_header *sunrpc_table_header;
+
+/*
+ * FIXME: changing the UDP slot table size should also resize the UDP
+ * socket buffers for existing UDP transports
+ */
+static ctl_table xs_tunables_table[] = {
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "smb_slot_table_entries",
+ .data = &xprt_smb_slot_table_entries,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_minmax,
+ .strategy = &sysctl_intvec,
+ .extra1 = &min_slot_table_size,
+ .extra2 = &max_slot_table_size
+ },
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "smb_fin_timeout",
+ .data = &xs_smb_fin_timeout,
+ .maxlen = sizeof(xs_smb_fin_timeout),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_jiffies,
+ .strategy = sysctl_jiffies
+ },
+ {
+ .ctl_name = 0,
+ },
+};
+
+static ctl_table sunrpc_table[] = {
+ {
+ .ctl_name = CTL_SUNRPC,
+ .procname = "sunrpc",
+ .mode = 0555,
+ .child = xs_tunables_table
+ },
+ {
+ .ctl_name = 0,
+ },
+};
+
+#endif
+
+/*
+ * Wait duration for an RPC TCP connection to be established. Solaris
+ * NFS over TCP uses 60 seconds, for example, which is in line with how
+ * long a server takes to reboot.
+ */
+#define XS_TCP_CONN_TO (60U * HZ)
+
+/*
+ * Wait duration for a reply from the RPC portmapper.
+ */
+#define XS_BIND_TO (60U * HZ)
+
+/*
+ * The reestablish timeout allows clients to delay for a bit before attempting
+ * to reconnect to a server that just dropped our connection.
+ *
+ * We implement an exponential backoff when trying to reestablish a TCP
+ * transport connection with the server. Some servers like to drop a TCP
+ * connection when they are overworked, so we start with a short timeout and
+ * increase over time if the server is down or not responding.
+ */
+#define XS_TCP_INIT_REEST_TO (3U * HZ)
+#define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
+
+/*
+ * reconnecting a SMB socket is expensive, so we don't do idle timeouts if
+ * we can help it.
+ */
+#define XS_SMB_IDLE_DISC_TO (~0UL)
+
+
+#ifdef RPC_DEBUG
+# undef RPC_DEBUG_DATA
+# define RPCDBG_FACILITY RPCDBG_TRANS
+#endif
+
+#ifdef RPC_DEBUG_DATA
+static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
+{
+ u8 *buf = (u8 *) packet;
+ int j;
+
+ dprintk("RPC: %s\n", msg);
+ for (j = 0; j < count && j < 128; j += 4) {
+ if (!(j & 31)) {
+ if (j)
+ dprintk("\n");
+ dprintk("0x%04x ", j);
+ }
+ dprintk("%02x%02x%02x%02x ",
+ buf[j], buf[j+1], buf[j+2], buf[j+3]);
+ }
+ dprintk("\n");
+}
+#else
+static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
+{
+ /* NOP */
+}
+#endif
+
+struct smb_xprt {
+ struct rpc_xprt xprt;
+
+ /*
+ * Network layer
+ */
+ struct socket * sock;
+ struct sock * inet;
+
+ /*
+ * State of TCP reply receive
+ */
+ __be32 tcp_fraghdr;
+ struct smb_header smb_header;
+
+ u32 tcp_offset,
+ tcp_reclen;
+
+ unsigned long tcp_copied,
+ tcp_flags;
+
+ /*
+ * Connection of transports
+ */
+ struct delayed_work connect_worker;
+ struct sockaddr_storage addr;
+ unsigned short port;
+
+ /*
+ * Saved socket callback addresses
+ */
+ void (*old_data_ready)(struct sock *, int);
+ void (*old_state_change)(struct sock *);
+ void (*old_write_space)(struct sock *);
+ void (*old_error_report)(struct sock *);
+};
+
+/*
+ * TCP receive state flags
+ */
+#define TCP_RCV_COPY_FRAGHDR (1UL << 0)
+#define TCP_RCV_READ_SMBHDR (1UL << 1)
+#define TCP_RCV_COPY_SMBHDR (1UL << 2)
+#define TCP_RCV_COPY_DATA (1UL << 3)
+
+static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
+{
+ return (struct sockaddr *) &xprt->addr;
+}
+
+static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
+{
+ return (struct sockaddr_in *) &xprt->addr;
+}
+
+static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
+{
+ return (struct sockaddr_in6 *) &xprt->addr;
+}
+
+static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
+{
+ struct sockaddr *sap = xs_addr(xprt);
+ struct sockaddr_in6 *sin6;
+ struct sockaddr_in *sin;
+ char buf[128];
+
+ (void)rpc_ntop(sap, buf, sizeof(buf));
+ xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL);
+
+ switch (sap->sa_family) {
+ case AF_INET:
+ sin = xs_addr_in(xprt);
+ (void)snprintf(buf, sizeof(buf), "%02x%02x%02x%02x",
+ NIPQUAD(sin->sin_addr.s_addr));
+ break;
+ case AF_INET6:
+ sin6 = xs_addr_in6(xprt);
+ (void)snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
+ break;
+ default:
+ BUG();
+ }
+ xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
+}
+
+static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
+{
+ struct sockaddr *sap = xs_addr(xprt);
+ char buf[128];
+
+ (void)snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
+ xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
+
+ (void)snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
+ xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
+}
+
+static void xs_format_peer_addresses(struct rpc_xprt *xprt,
+ const char *protocol,
+ const char *netid)
+{
+ xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
+ xprt->address_strings[RPC_DISPLAY_NETID] = netid;
+ xs_format_common_peer_addresses(xprt);
+ xs_format_common_peer_ports(xprt);
+}
+
+static void xs_free_peer_addresses(struct rpc_xprt *xprt)
+{
+ unsigned int i;
+
+ for (i = 0; i < RPC_DISPLAY_MAX; i++)
+ switch (i) {
+ case RPC_DISPLAY_PROTO:
+ case RPC_DISPLAY_NETID:
+ continue;
+ default:
+ kfree(xprt->address_strings[i]);
+ }
+}
+
+#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
+
+static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
+{
+ struct msghdr msg = {
+ .msg_name = addr,
+ .msg_namelen = addrlen,
+ .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
+ };
+ struct kvec iov = {
+ .iov_base = vec->iov_base + base,
+ .iov_len = vec->iov_len - base,
+ };
+
+ if (iov.iov_len != 0)
+ return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
+ return kernel_sendmsg(sock, &msg, NULL, 0, 0);
+}
+
+static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
+{
+ struct page **ppage;
+ unsigned int remainder;
+ int err, sent = 0;
+
+ remainder = xdr->page_len - base;
+ base += xdr->page_base;
+ ppage = xdr->pages + (base >> PAGE_SHIFT);
+ base &= ~PAGE_MASK;
+ for(;;) {
+ unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
+ int flags = XS_SENDMSG_FLAGS;
+
+ remainder -= len;
+ if (remainder != 0 || more)
+ flags |= MSG_MORE;
+ err = sock->ops->sendpage(sock, *ppage, base, len, flags);
+ if (remainder == 0 || err != len)
+ break;
+ sent += err;
+ ppage++;
+ base = 0;
+ }
+ if (sent == 0)
+ return err;
+ if (err > 0)
+ sent += err;
+ return sent;
+}
+
+/**
+ * xs_sendpages - write pages directly to a socket
+ * @sock: socket to send on
+ * @addr: UDP only -- address of destination
+ * @addrlen: UDP only -- length of destination address
+ * @xdr: buffer containing this request
+ * @base: starting position in the buffer
+ *
+ */
+static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
+{
+ unsigned int remainder = xdr->len - base;
+ int err, sent = 0;
+
+ if (unlikely(!sock))
+ return -ENOTSOCK;
+
+ clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
+ if (base != 0) {
+ addr = NULL;
+ addrlen = 0;
+ }
+
+ if (base < xdr->head[0].iov_len || addr != NULL) {
+ unsigned int len = xdr->head[0].iov_len - base;
+ remainder -= len;
+ err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
+ if (remainder == 0 || err != len)
+ goto out;
+ sent += err;
+ base = 0;
+ } else
+ base -= xdr->head[0].iov_len;
+
+ if (base < xdr->page_len) {
+ unsigned int len = xdr->page_len - base;
+ remainder -= len;
+ err = xs_send_pagedata(sock, xdr, base, remainder != 0);
+ if (remainder == 0 || err != len)
+ goto out;
+ sent += err;
+ base = 0;
+ } else
+ base -= xdr->page_len;
+
+ if (base >= xdr->tail[0].iov_len)
+ return sent;
+ err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
+out:
+ if (sent == 0)
+ return err;
+ if (err > 0)
+ sent += err;
+ return sent;
+}
+
+static void xs_nospace_callback(struct rpc_task *task)
+{
+ struct smb_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct smb_xprt, xprt);
+
+ transport->inet->sk_write_pending--;
+ clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
+}
+
+/**
+ * xs_nospace - place task on wait queue if transmit was incomplete
+ * @task: task to put to sleep
+ *
+ */
+static int xs_nospace(struct rpc_task *task)
+{
+ struct rpc_rqst *req = task->tk_rqstp;
+ struct rpc_xprt *xprt = req->rq_xprt;
+ struct smb_xprt *transport = container_of(xprt, struct smb_xprt, xprt);
+ int ret = 0;
+
+ dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
+ task->tk_pid, req->rq_slen - req->rq_bytes_sent,
+ req->rq_slen);
+
+ /* Protect against races with write_space */
+ spin_lock_bh(&xprt->transport_lock);
+
+ /* Don't race with disconnect */
+ if (xprt_connected(xprt)) {
+ if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
+ ret = -EAGAIN;
+ /*
+ * Notify TCP that we're limited by the application
+ * window size
+ */
+ set_bit(SOCK_NOSPACE, &transport->sock->flags);
+ transport->inet->sk_write_pending++;
+ /* ...and wait for more buffer space */
+ xprt_wait_for_buffer_space(task, xs_nospace_callback);
+ }
+ } else {
+ clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
+ ret = -ENOTCONN;
+ }
+
+ spin_unlock_bh(&xprt->transport_lock);
+ return ret;
+}
+
+/**
+ * xs_tcp_shutdown - gracefully shut down a TCP socket
+ * @xprt: transport
+ *
+ * Initiates a graceful shutdown of the TCP socket by calling the
+ * equivalent of shutdown(SHUT_WR);
+ */
+static void xs_tcp_shutdown(struct rpc_xprt *xprt)
+{
+ struct smb_xprt *transport = container_of(xprt, struct smb_xprt, xprt);
+ struct socket *sock = transport->sock;
+
+ if (sock != NULL)
+ kernel_sock_shutdown(sock, SHUT_WR);
+}
+
+static inline void xs_encode_smb_record_marker(struct xdr_buf *buf)
+{
+ u32 reclen = buf->len - sizeof(rpc_fraghdr);
+ rpc_fraghdr *base = buf->head[0].iov_base;
+ *base = htonl(SMB_FRAGMENT_SIZE_MASK & reclen);
+}
+
+/**
+ * xs_smb_send_request - write an RPC request to a TCP socket
+ * @task: address of RPC task that manages the state of an RPC request
+ *
+ * Return values:
+ * 0: The request has been sent
+ * EAGAIN: The socket was blocked, please call again later to
+ * complete the request
+ * ENOTCONN: Caller needs to invoke connect logic then call again
+ * other: Some other error occured, the request was not sent
+ *
+ * XXX: In the case of soft timeouts, should we eventually give up
+ * if sendmsg is not able to make progress?
+ */
+static int xs_smb_send_request(struct rpc_task *task)
+{
+ struct rpc_rqst *req = task->tk_rqstp;
+ struct rpc_xprt *xprt = req->rq_xprt;
+ struct smb_xprt *transport = container_of(xprt, struct smb_xprt, xprt);
+ struct xdr_buf *xdr = &req->rq_snd_buf;
+ int status;
+
+ xs_encode_smb_record_marker(&req->rq_snd_buf);
+
+ xs_pktdump("packet data:",
+ req->rq_svec->iov_base,
+ req->rq_svec->iov_len);
+
+ /* Continue transmitting the packet/record. We must be careful
+ * to cope with writespace callbacks arriving _after_ we have
+ * called sendmsg(). */
+ while (1) {
+ status = xs_sendpages(transport->sock,
+ NULL, 0, xdr, req->rq_bytes_sent);
+
+ dprintk("RPC: %s(%u) = %d\n", __func__,
+ xdr->len - req->rq_bytes_sent, status);
+
+ if (unlikely(status < 0))
+ break;
+
+ /* If we've sent the entire packet, immediately
+ * reset the count of bytes sent. */
+ req->rq_bytes_sent += status;
+ task->tk_bytes_sent += status;
+ if (likely(req->rq_bytes_sent >= req->rq_slen)) {
+ req->rq_bytes_sent = 0;
+ return 0;
+ }
+
+ if (status != 0)
+ continue;
+ status = -EAGAIN;
+ break;
+ }
+ if (!transport->sock)
+ goto out;
+
+ switch (status) {
+ case -ENOTSOCK:
+ status = -ENOTCONN;
+ /* Should we call xs_close() here? */
+ break;
+ case -EAGAIN:
+ status = xs_nospace(task);
+ break;
+ default:
+ dprintk("RPC: sendmsg returned unrecognized error %d\n",
+ -status);
+ case -ECONNRESET:
+ case -EPIPE:
+ xs_tcp_shutdown(xprt);
+ case -ECONNREFUSED:
+ case -ENOTCONN:
+ clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
+ }
+out:
+ return status;
+}
+
+/**
+ * xs_tcp_release_xprt - clean up after a tcp transmission
+ * @xprt: transport
+ * @task: rpc task
+ *
+ * This cleans up if an error causes us to abort the transmission of a request.
+ * In this case, the socket may need to be reset in order to avoid confusing
+ * the server.
+ */
+static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
+{
+ struct rpc_rqst *req;
+
+ if (task != xprt->snd_task)
+ return;
+ if (task == NULL)
+ goto out_release;
+ req = task->tk_rqstp;
+ if (req->rq_bytes_sent == 0)
+ goto out_release;
+ if (req->rq_bytes_sent == req->rq_snd_buf.len)
+ goto out_release;
+ set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
+out_release:
+ xprt_release_xprt(xprt, task);
+}
+
+static void xs_save_old_callbacks(struct smb_xprt *transport, struct sock *sk)
+{
+ transport->old_data_ready = sk->sk_data_ready;
+ transport->old_state_change = sk->sk_state_change;
+ transport->old_write_space = sk->sk_write_space;
+ transport->old_error_report = sk->sk_error_report;
+}
+
+static void xs_restore_old_callbacks(struct smb_xprt *transport, struct sock *sk)
+{
+ sk->sk_data_ready = transport->old_data_ready;
+ sk->sk_state_change = transport->old_state_change;
+ sk->sk_write_space = transport->old_write_space;
+ sk->sk_error_report = transport->old_error_report;
+}
+
+static void xs_reset_transport(struct smb_xprt *transport)
+{
+ struct socket *sock = transport->sock;
+ struct sock *sk = transport->inet;
+
+ if (sk == NULL)
+ return;
+
+ write_lock_bh(&sk->sk_callback_lock);
+ transport->inet = NULL;
+ transport->sock = NULL;
+
+ sk->sk_user_data = NULL;
+
+ xs_restore_old_callbacks(transport, sk);
+ write_unlock_bh(&sk->sk_callback_lock);
+
+ sk->sk_no_check = 0;
+
+ sock_release(sock);
+}
+
+/**
+ * xs_close - close a socket
+ * @xprt: transport
+ *
+ * This is used when all requests are complete; ie, no DRC state remains
+ * on the server we want to save.
+ *
+ * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
+ * xs_reset_transport() zeroing the socket from underneath a writer.
+ */
+static void xs_close(struct rpc_xprt *xprt)
+{
+ struct smb_xprt *transport = container_of(xprt, struct smb_xprt, xprt);
+
+ dprintk("RPC: xs_close xprt %p\n", xprt);
+
+ xs_reset_transport(transport);
+
+ smp_mb__before_clear_bit();
+ clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
+ clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
+ clear_bit(XPRT_CLOSING, &xprt->state);
+ smp_mb__after_clear_bit();
+ xprt_disconnect_done(xprt);
+}
+
+static void xs_tcp_close(struct rpc_xprt *xprt)
+{
+ if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
+ xs_close(xprt);
+ else
+ xs_tcp_shutdown(xprt);
+}
+
+/**
+ * xs_destroy - prepare to shutdown a transport
+ * @xprt: doomed transport
+ *
+ */
+static void xs_destroy(struct rpc_xprt *xprt)
+{
+ struct smb_xprt *transport = container_of(xprt, struct smb_xprt, xprt);
+
+ dprintk("RPC: xs_destroy xprt %p\n", xprt);
+
+ cancel_rearming_delayed_work(&transport->connect_worker);
+
+ xs_close(xprt);
+ xs_free_peer_addresses(xprt);
+ kfree(xprt->slot);
+ kfree(xprt);
+ module_put(THIS_MODULE);
+}
+
+static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
+{
+ return (struct rpc_xprt *) sk->sk_user_data;
+}
+
+static inline void xs_smb_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
+{
+ struct smb_xprt *transport = container_of(xprt, struct smb_xprt, xprt);
+ size_t len, used;
+ char *p;
+
+ p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
+ len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
+ used = xdr_skb_read_bits(desc, p, len);
+ transport->tcp_offset += used;
+ if (used != len)
+ return;
+
+ transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
+ if (transport->tcp_reclen & ~SMB_FRAGMENT_SIZE_MASK) {
+ dprintk("SMB: top byte of fragheader invalid\n");
+ xprt_force_disconnect(xprt);
+ return;
+ }
+
+ transport->tcp_reclen &= SMB_FRAGMENT_SIZE_MASK;
+
+ transport->tcp_flags = TCP_RCV_READ_SMBHDR;
+ transport->tcp_offset = 0;
+
+ /* Sanity check of the record length */
+ if (unlikely(transport->tcp_reclen < sizeof(struct smb_header))) {
+ dprintk("RPC: invalid SMB record fragment length\n");
+ xprt_force_disconnect(xprt);
+ return;
+ }
+ dprintk("RPC: reading SMB record fragment of length %d\n",
+ transport->tcp_reclen);
+}
+
+static void xs_smb_check_fraghdr(struct smb_xprt *transport)
+{
+ if (transport->tcp_offset == transport->tcp_reclen) {
+ transport->tcp_flags = TCP_RCV_COPY_FRAGHDR;
+ transport->tcp_offset = 0;
+ transport->tcp_copied = 0;
+ }
+}
+
+static inline void xs_smb_read_smbhdr(struct smb_xprt *transport, struct xdr_skb_reader *desc)
+{
+ size_t len, used;
+ char *p;
+
+ len = sizeof(transport->smb_header) - transport->tcp_offset;
+ dprintk("SMB: reading SMB header (%Zu bytes)\n", len);
+ p = ((char *) &transport->smb_header) + transport->tcp_offset;
+ used = xdr_skb_read_bits(desc, p, len);
+ transport->tcp_offset += used;
+ if (used != len)
+ return;
+ transport->tcp_flags = TCP_RCV_COPY_SMBHDR | TCP_RCV_COPY_DATA;
+
+ if (transport->smb_header.flags & SMBFLG_RESPONSE)
+ dprintk("SMB: reading %s MID 0x%04x\n",
+ (transport->smb_header.flags & SMBFLG_RESPONSE) ?
+ "reply for" : "request with",
+ le16_to_cpu(transport->smb_header.mid));
+
+ xs_smb_check_fraghdr(transport);
+}
+
+static inline void xs_smb_read_common(struct rpc_xprt *xprt,
+ struct xdr_skb_reader *desc,
+ struct rpc_rqst *req)
+{
+ struct smb_xprt *transport =
+ container_of(xprt, struct smb_xprt, xprt);
+ struct xdr_buf *rcvbuf;
+ size_t len;
+ ssize_t r;
+
+ rcvbuf = &req->rq_private_buf;
+
+ /* copy SMB header into buffer */
+ if (transport->tcp_flags & TCP_RCV_COPY_SMBHDR) {
+ memcpy(rcvbuf->head[0].iov_base, &transport->smb_header,
+ sizeof(transport->smb_header));
+ transport->tcp_copied += sizeof(transport->smb_header);
+ transport->tcp_flags &= ~TCP_RCV_COPY_SMBHDR;
+ }
+
+ len = desc->count;
+ if (len > transport->tcp_reclen - transport->tcp_offset) {
+ struct xdr_skb_reader my_desc;
+
+ len = transport->tcp_reclen - transport->tcp_offset;
+ memcpy(&my_desc, desc, sizeof(my_desc));
+ my_desc.count = len;
+ r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
+ &my_desc, xdr_skb_read_bits);
+ desc->count -= r;
+ desc->offset += r;
+ } else
+ r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
+ desc, xdr_skb_read_bits);
+
+ if (r > 0) {
+ transport->tcp_copied += r;
+ transport->tcp_offset += r;
+ }
+ if (r != len) {
+ /* Error when copying to the receive buffer,
+ * usually because we weren't able to allocate
+ * additional buffer pages. All we can do now
+ * is turn off TCP_RCV_COPY_DATA, so the request
+ * will not receive any additional updates,
+ * and time out.
+ * Any remaining data from this record will
+ * be discarded.
+ */
+ transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
+ dprintk("RPC: XID %08x truncated request\n",
+ ntohl(transport->smb_header.mid));
+ dprintk("RPC: xprt = %p, tcp_copied = %lu, "
+ "tcp_offset = %u, tcp_reclen = %u\n",
+ xprt, transport->tcp_copied,
+ transport->tcp_offset, transport->tcp_reclen);
+ return;
+ }
+
+ dprintk("RPC: XID %08x read %Zd bytes\n",
+ ntohl(transport->smb_header.mid), r);
+ dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
+ "tcp_reclen = %u\n", xprt, transport->tcp_copied,
+ transport->tcp_offset, transport->tcp_reclen);
+
+ if (transport->tcp_copied == req->rq_private_buf.buflen ||
+ transport->tcp_offset == transport->tcp_reclen)
+ transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
+
+ return;
+}
+
+/*
+ * Finds the request corresponding to the RPC xid and invokes the common
+ * tcp read code to read the data.
+ */
+static inline int xs_smb_read_reply(struct rpc_xprt *xprt,
+ struct xdr_skb_reader *desc)
+{
+ struct smb_xprt *transport =
+ container_of(xprt, struct smb_xprt, xprt);
+ struct rpc_rqst *req;
+
+ dprintk("RPC: read reply XID %08x\n", ntohl(transport->smb_header.mid));
+
+ /* Find and lock the request corresponding to this xid */
+ spin_lock(&xprt->transport_lock);
+ req = xprt_lookup_rqst(xprt, transport->smb_header.mid);
+ if (!req) {
+ dprintk("RPC: XID %08x request not found!\n",
+ ntohl(transport->smb_header.mid));
+ spin_unlock(&xprt->transport_lock);
+ return -1;
+ }
+
+ xs_smb_read_common(xprt, desc, req);
+
+ if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
+ xprt_complete_rqst(req->rq_task, transport->tcp_copied);
+
+ spin_unlock(&xprt->transport_lock);
+ return 0;
+}
+
+#if defined(CONFIG_NFS_V4_1)
+/*
+ * Obtains an rpc_rqst previously allocated and invokes the common
+ * tcp read code to read the data. The result is placed in the callback
+ * queue.
+ * If we're unable to obtain the rpc_rqst we schedule the closing of the
+ * connection and return -1.
+ */
+static inline int xs_smb_read_callback(struct rpc_xprt *xprt,
+ struct xdr_skb_reader *desc)
+{
+ struct smb_xprt *transport =
+ container_of(xprt, struct smb_xprt, xprt);
+ struct rpc_rqst *req;
+
+ req = xprt_alloc_bc_request(xprt);
+ if (req == NULL) {
+ printk(KERN_WARNING "Callback slot table overflowed\n");
+ xprt_force_disconnect(xprt);
+ return -1;
+ }
+
+ req->rq_xid = transport->smb_header.mid;
+ dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
+ xs_smb_read_common(xprt, desc, req);
+
+ if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) {
+ struct svc_serv *bc_serv = xprt->bc_serv;
+
+ /*
+ * Add callback request to callback list. The callback
+ * service sleeps on the sv_cb_waitq waiting for new
+ * requests. Wake it up after adding enqueing the
+ * request.
+ */
+ dprintk("RPC: add callback request to list\n");
+ spin_lock(&bc_serv->sv_cb_lock);
+ list_add(&req->rq_bc_list, &bc_serv->sv_cb_list);
+ spin_unlock(&bc_serv->sv_cb_lock);
+ wake_up(&bc_serv->sv_cb_waitq);
+ }
+
+ req->rq_private_buf.len = transport->tcp_copied;
+
+ return 0;
+}
+
+static inline int _xs_smb_read_data(struct rpc_xprt *xprt,
+ struct xdr_skb_reader *desc)
+{
+ struct smb_xprt *transport =
+ container_of(xprt, struct smb_xprt, xprt);
+
+ return (transport->smb_header.flags & SMBFLG_RESPONSE) ?
+ xs_smb_read_reply(xprt, desc) :
+ xs_smb_read_callback(xprt, desc);
+}
+#else
+static inline int _xs_smb_read_data(struct rpc_xprt *xprt,
+ struct xdr_skb_reader *desc)
+{
+ return xs_smb_read_reply(xprt, desc);
+}
+#endif /* CONFIG_NFS_V4_1 */
+
+/*
+ * Read data off the transport. This can be either an RPC_CALL or an
+ * RPC_REPLY. Relay the processing to helper functions.
+ */
+static void xs_smb_read_data(struct rpc_xprt *xprt,
+ struct xdr_skb_reader *desc)
+{
+ struct smb_xprt *transport =
+ container_of(xprt, struct smb_xprt, xprt);
+
+ if (_xs_smb_read_data(xprt, desc) == 0)
+ xs_smb_check_fraghdr(transport);
+ else {
+ /*
+ * The transport_lock protects the request handling.
+ * There's no need to hold it to update the tcp_flags.
+ */
+ transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
+ }
+}
+
+static inline void xs_smb_read_discard(struct smb_xprt *transport, struct xdr_skb_reader *desc)
+{
+ size_t len;
+
+ len = transport->tcp_reclen - transport->tcp_offset;
+ if (len > desc->count)
+ len = desc->count;
+ desc->count -= len;
+ desc->offset += len;
+ transport->tcp_offset += len;
+ dprintk("RPC: discarded %Zu bytes\n", len);
+ xs_smb_check_fraghdr(transport);
+}
+
+static int xs_smb_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
+{
+ struct rpc_xprt *xprt = rd_desc->arg.data;
+ struct smb_xprt *transport = container_of(xprt, struct smb_xprt, xprt);
+ struct xdr_skb_reader desc = {
+ .skb = skb,
+ .offset = offset,
+ .count = len,
+ };
+
+ dprintk("RPC: xs_tcp_data_recv started\n");
+ do {
+ dprintk("SMB: %s tcp_flags=0x%lx\n", __func__,
+ transport->tcp_flags);
+ /* Read in a new fragment marker if necessary */
+ /* Can we ever really expect to get completely empty fragments? */
+ if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
+ xs_smb_read_fraghdr(xprt, &desc);
+ continue;
+ }
+ /* Read in the xid if necessary */
+ if (transport->tcp_flags & TCP_RCV_READ_SMBHDR) {
+ xs_smb_read_smbhdr(transport, &desc);
+ continue;
+ }
+ /* Read in the request data */
+ if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
+ xs_smb_read_data(xprt, &desc);
+ continue;
+ }
+ /* Skip over any trailing bytes on short reads */
+ xs_smb_read_discard(transport, &desc);
+ } while (desc.count);
+ dprintk("RPC: xs_tcp_data_recv done\n");
+ return len - desc.count;
+}
+
+/**
+ * xs_smb_data_ready - "data ready" callback for TCP sockets
+ * @sk: socket with data to read
+ * @bytes: how much data to read
+ *
+ */
+static void xs_smb_data_ready(struct sock *sk, int bytes)
+{
+ struct rpc_xprt *xprt;
+ read_descriptor_t rd_desc;
+ int read;
+
+ dprintk("SMB: xs_smb_data_ready...\n");
+
+ read_lock(&sk->sk_callback_lock);
+ if (!(xprt = xprt_from_sock(sk)))
+ goto out;
+ if (xprt->shutdown)
+ goto out;
+
+ /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
+ rd_desc.arg.data = xprt;
+ do {
+ rd_desc.count = 65536;
+ read = tcp_read_sock(sk, &rd_desc, xs_smb_data_recv);
+ } while (read > 0);
+out:
+ read_unlock(&sk->sk_callback_lock);
+}
+
+/*
+ * Do the equivalent of linger/linger2 handling for dealing with
+ * broken servers that don't close the socket in a timely
+ * fashion
+ */
+static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
+ unsigned long timeout)
+{
+ struct smb_xprt *transport;
+
+ if (xprt_test_and_set_connecting(xprt))
+ return;
+ set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
+ transport = container_of(xprt, struct smb_xprt, xprt);
+ queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
+ timeout);
+}
+
+static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
+{
+ struct smb_xprt *transport;
+
+ transport = container_of(xprt, struct smb_xprt, xprt);
+
+ if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
+ !cancel_delayed_work(&transport->connect_worker))
+ return;
+ clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
+ xprt_clear_connecting(xprt);
+}
+
+static void xs_sock_mark_closed(struct rpc_xprt *xprt)
+{
+ smp_mb__before_clear_bit();
+ clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
+ clear_bit(XPRT_CLOSING, &xprt->state);
+ smp_mb__after_clear_bit();
+ /* Mark transport as closed and wake up all pending tasks */
+ xprt_disconnect_done(xprt);
+}
+
+/**
+ * xs_smb_state_change - callback to handle TCP socket state changes
+ * @sk: socket whose state has changed
+ *
+ */
+static void xs_smb_state_change(struct sock *sk)
+{
+ struct rpc_xprt *xprt;
+
+ read_lock(&sk->sk_callback_lock);
+ if (!(xprt = xprt_from_sock(sk)))
+ goto out;
+ dprintk("RPC: xs_smb_state_change client %p...\n", xprt);
+ dprintk("RPC: state %x conn %d dead %d zapped %d\n",
+ sk->sk_state, xprt_connected(xprt),
+ sock_flag(sk, SOCK_DEAD),
+ sock_flag(sk, SOCK_ZAPPED));
+
+ switch (sk->sk_state) {
+ case TCP_ESTABLISHED:
+ spin_lock_bh(&xprt->transport_lock);
+ if (!xprt_test_and_set_connected(xprt)) {
+ struct smb_xprt *transport = container_of(xprt,
+ struct smb_xprt, xprt);
+
+ /* Reset TCP record info */
+ transport->tcp_offset = 0;
+ transport->tcp_reclen = 0;
+ transport->tcp_copied = 0;
+ transport->tcp_flags = TCP_RCV_COPY_FRAGHDR;
+
+ xprt_wake_pending_tasks(xprt, -EAGAIN);
+ }
+ spin_unlock_bh(&xprt->transport_lock);
+ break;
+ case TCP_FIN_WAIT1:
+ /* The client initiated a shutdown of the socket */
+ xprt->connect_cookie++;
+ xprt->reestablish_timeout = 0;
+ set_bit(XPRT_CLOSING, &xprt->state);
+ smp_mb__before_clear_bit();
+ clear_bit(XPRT_CONNECTED, &xprt->state);
+ clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
+ smp_mb__after_clear_bit();
+ xs_tcp_schedule_linger_timeout(xprt, xs_smb_fin_timeout);
+ break;
+ case TCP_CLOSE_WAIT:
+ /* The server initiated a shutdown of the socket */
+ xprt_force_disconnect(xprt);
+ case TCP_SYN_SENT:
+ xprt->connect_cookie++;
+ case TCP_CLOSING:
+ /*
+ * If the server closed down the connection, make sure that
+ * we back off before reconnecting
+ */
+ if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
+ xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
+ break;
+ case TCP_LAST_ACK:
+ set_bit(XPRT_CLOSING, &xprt->state);
+ xs_tcp_schedule_linger_timeout(xprt, xs_smb_fin_timeout);
+ smp_mb__before_clear_bit();
+ clear_bit(XPRT_CONNECTED, &xprt->state);
+ smp_mb__after_clear_bit();
+ break;
+ case TCP_CLOSE:
+ xs_tcp_cancel_linger_timeout(xprt);
+ xs_sock_mark_closed(xprt);
+ }
+ out:
+ read_unlock(&sk->sk_callback_lock);
+}
+
+/**
+ * xs_error_report - callback mainly for catching socket errors
+ * @sk: socket
+ */
+static void xs_error_report(struct sock *sk)
+{
+ struct rpc_xprt *xprt;
+
+ read_lock(&sk->sk_callback_lock);
+ if (!(xprt = xprt_from_sock(sk)))
+ goto out;
+ dprintk("RPC: %s client %p...\n"
+ "RPC: error %d\n",
+ __func__, xprt, sk->sk_err);
+ xprt_wake_pending_tasks(xprt, -EAGAIN);
+out:
+ read_unlock(&sk->sk_callback_lock);
+}
+
+static void xs_write_space(struct sock *sk)
+{
+ struct socket *sock;
+ struct rpc_xprt *xprt;
+
+ if (unlikely(!(sock = sk->sk_socket)))
+ return;
+ clear_bit(SOCK_NOSPACE, &sock->flags);
+
+ if (unlikely(!(xprt = xprt_from_sock(sk))))
+ return;
+ if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
+ return;
+
+ xprt_write_space(xprt);
+}
+
+/**
+ * xs_tcp_write_space - callback invoked when socket buffer space
+ * becomes available
+ * @sk: socket whose state has changed
+ *
+ * Called when more output buffer space is available for this socket.
+ * We try not to wake our writers until they can make "significant"
+ * progress, otherwise we'll waste resources thrashing kernel_sendmsg
+ * with a bunch of small requests.
+ */
+static void xs_tcp_write_space(struct sock *sk)
+{
+ read_lock(&sk->sk_callback_lock);
+
+ /* from net/core/stream.c:sk_stream_write_space */
+ if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
+ xs_write_space(sk);
+
+ read_unlock(&sk->sk_callback_lock);
+}
+
+/**
+ * xs_smb_set_port - reset the port number in the remote endpoint address
+ * @xprt: generic transport
+ * @port: new port number
+ *
+ * Should never be needed for SMB transport so just BUG() here.
+ */
+static void
+xs_smb_set_port(struct rpc_xprt *xprt, unsigned short port)
+{
+ dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
+ BUG();
+}
+
+/**
+ * xs_smb_rpcbind - attempt to rebind the transport
+ * @task: task
+ *
+ * Should never be needed for SMB transport so just BUG() here.
+ */
+static void
+xs_smb_rpcbind(struct rpc_task *task)
+{
+ dprintk("RPC: rpcbind called on SMB task %p", task);
+ BUG();
+}
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+static struct lock_class_key xs_key[2];
+static struct lock_class_key xs_slock_key[2];
+
+static inline void xs_reclassify_socket4(struct socket *sock)
+{
+ struct sock *sk = sock->sk;
+
+ BUG_ON(sock_owned_by_user(sk));
+ sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
+ &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
+}
+
+static inline void xs_reclassify_socket6(struct socket *sock)
+{
+ struct sock *sk = sock->sk;
+
+ BUG_ON(sock_owned_by_user(sk));
+ sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
+ &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
+}
+#else
+static inline void xs_reclassify_socket4(struct socket *sock)
+{
+}
+
+static inline void xs_reclassify_socket6(struct socket *sock)
+{
+}
+#endif
+
+/*
+ * We need to preserve the port number so the reply cache on the server can
+ * find our cached RPC replies when we get around to reconnecting.
+ */
+static void xs_abort_connection(struct rpc_xprt *xprt, struct smb_xprt *transport)
+{
+ int result;
+ struct sockaddr any;
+
+ dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
+
+ /*
+ * Disconnect the transport socket by doing a connect operation
+ * with AF_UNSPEC. This should return immediately...
+ */
+ memset(&any, 0, sizeof(any));
+ any.sa_family = AF_UNSPEC;
+ result = kernel_connect(transport->sock, &any, sizeof(any), 0);
+ if (!result)
+ xs_sock_mark_closed(xprt);
+ else
+ dprintk("RPC: AF_UNSPEC connect return code %d\n",
+ result);
+}
+
+static void xs_tcp_reuse_connection(struct rpc_xprt *xprt, struct smb_xprt *transport)
+{
+ unsigned int state = transport->inet->sk_state;
+
+ if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED)
+ return;
+ if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT))
+ return;
+ xs_abort_connection(xprt, transport);
+}
+
+static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
+{
+ struct smb_xprt *transport = container_of(xprt, struct smb_xprt, xprt);
+
+ if (!transport->inet) {
+ struct sock *sk = sock->sk;
+
+ write_lock_bh(&sk->sk_callback_lock);
+
+ xs_save_old_callbacks(transport, sk);
+
+ sk->sk_user_data = xprt;
+ sk->sk_data_ready = xs_smb_data_ready;
+ sk->sk_state_change = xs_smb_state_change;
+ sk->sk_write_space = xs_tcp_write_space;
+ sk->sk_error_report = xs_error_report;
+ sk->sk_allocation = GFP_ATOMIC;
+
+ /* socket options */
+ sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
+ sock_reset_flag(sk, SOCK_LINGER);
+ tcp_sk(sk)->linger2 = 0;
+ tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
+
+ xprt_clear_connected(xprt);
+
+ /* Reset to new socket */
+ transport->sock = sock;
+ transport->inet = sk;
+
+ write_unlock_bh(&sk->sk_callback_lock);
+ }
+
+ if (!xprt_bound(xprt))
+ return -ENOTCONN;
+
+ /* Tell the socket layer to start connecting... */
+ xprt->stat.connect_count++;
+ xprt->stat.connect_start = jiffies;
+ return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
+}
+
+/**
+ * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
+ * @xprt: RPC transport to connect
+ * @transport: socket transport to connect
+ * @create_sock: function to create a socket of the correct type
+ *
+ * Invoked by a work queue tasklet.
+ */
+static void xs_tcp_setup_socket(struct rpc_xprt *xprt,
+ struct smb_xprt *transport,
+ struct socket *(*create_sock)(struct rpc_xprt *,
+ struct smb_xprt *))
+{
+ struct socket *sock = transport->sock;
+ int status = -EIO;
+
+ if (xprt->shutdown)
+ goto out;
+
+ if (!sock) {
+ clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
+ sock = create_sock(xprt, transport);
+ if (IS_ERR(sock)) {
+ status = PTR_ERR(sock);
+ goto out;
+ }
+ } else {
+ int abort_and_exit;
+
+ abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
+ &xprt->state);
+ /* "close" the socket, preserving the local port */
+ xs_tcp_reuse_connection(xprt, transport);
+
+ if (abort_and_exit)
+ goto out_eagain;
+ }
+
+ dprintk("SMB: worker connecting xprt %p via %s to "
+ "%s (port %s)\n", xprt,
+ xprt->address_strings[RPC_DISPLAY_PROTO],
+ xprt->address_strings[RPC_DISPLAY_ADDR],
+ xprt->address_strings[RPC_DISPLAY_PORT]);
+
+ status = xs_tcp_finish_connecting(xprt, sock);
+ dprintk("SMB: %p connect status %d connected %d sock state %d\n",
+ xprt, -status, xprt_connected(xprt),
+ sock->sk->sk_state);
+ switch (status) {
+ default:
+ printk("%s: connect returned unhandled error %d\n",
+ __func__, status);
+ case -EADDRNOTAVAIL:
+ /* We're probably in TIME_WAIT. Get rid of existing socket,
+ * and retry
+ */
+ set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
+ xprt_force_disconnect(xprt);
+ break;
+ case -ECONNREFUSED:
+ case -ECONNRESET:
+ case -ENETUNREACH:
+ /* retry with existing socket, after a delay */
+ case 0:
+ case -EINPROGRESS:
+ case -EALREADY:
+ xprt_clear_connecting(xprt);
+ return;
+ }
+out_eagain:
+ status = -EAGAIN;
+out:
+ xprt_clear_connecting(xprt);
+ xprt_wake_pending_tasks(xprt, status);
+}
+
+static struct socket *xs_create_tcp_sock4(struct rpc_xprt *xprt,
+ struct smb_xprt *transport)
+{
+ struct socket *sock;
+ int err;
+
+ /* start from scratch */
+ err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
+ if (err < 0) {
+ dprintk("RPC: can't create TCP transport socket (%d).\n",
+ -err);
+ goto out_err;
+ }
+ xs_reclassify_socket4(sock);
+ return sock;
+out_err:
+ return ERR_PTR(-EIO);
+}
+
+/**
+ * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
+ * @work: RPC transport to connect
+ *
+ * Invoked by a work queue tasklet.
+ */
+static void xs_tcp_connect_worker4(struct work_struct *work)
+{
+ struct smb_xprt *transport =
+ container_of(work, struct smb_xprt, connect_worker.work);
+ struct rpc_xprt *xprt = &transport->xprt;
+
+ xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock4);
+}
+
+static struct socket *xs_create_tcp_sock6(struct rpc_xprt *xprt,
+ struct smb_xprt *transport)
+{
+ struct socket *sock;
+ int err;
+
+ /* start from scratch */
+ err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock);
+ if (err < 0) {
+ dprintk("RPC: can't create TCP transport socket (%d).\n",
+ -err);
+ goto out_err;
+ }
+ xs_reclassify_socket6(sock);
+ return sock;
+out_err:
+ return ERR_PTR(-EIO);
+}
+
+/**
+ * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
+ * @work: RPC transport to connect
+ *
+ * Invoked by a work queue tasklet.
+ */
+static void xs_tcp_connect_worker6(struct work_struct *work)
+{
+ struct smb_xprt *transport =
+ container_of(work, struct smb_xprt, connect_worker.work);
+ struct rpc_xprt *xprt = &transport->xprt;
+
+ xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock6);
+}
+
+/**
+ * xs_connect - connect a socket to a remote endpoint
+ * @task: address of RPC task that manages state of connect request
+ *
+ * TCP: If the remote end dropped the connection, delay reconnecting.
+ *
+ * UDP socket connects are synchronous, but we use a work queue anyway
+ * to guarantee that even unprivileged user processes can set up a
+ * socket on a privileged port.
+ *
+ * If a UDP socket connect fails, the delay behavior here prevents
+ * retry floods (hard mounts).
+ */
+static void xs_connect(struct rpc_task *task)
+{
+ struct rpc_xprt *xprt = task->tk_xprt;
+ struct smb_xprt *transport = container_of(xprt, struct smb_xprt, xprt);
+
+ if (xprt_test_and_set_connecting(xprt))
+ return;
+
+ if (transport->sock != NULL) {
+ dprintk("RPC: xs_connect delayed xprt %p for %lu "
+ "seconds\n",
+ xprt, xprt->reestablish_timeout / HZ);
+ queue_delayed_work(rpciod_workqueue,
+ &transport->connect_worker,
+ xprt->reestablish_timeout);
+ xprt->reestablish_timeout <<= 1;
+ if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
+ xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
+ } else {
+ dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
+ queue_delayed_work(rpciod_workqueue,
+ &transport->connect_worker, 0);
+ }
+}
+
+static void xs_tcp_connect(struct rpc_task *task)
+{
+ struct rpc_xprt *xprt = task->tk_xprt;
+
+ /* Exit if we need to wait for socket shutdown to complete */
+ if (test_bit(XPRT_CLOSING, &xprt->state))
+ return;
+ xs_connect(task);
+}
+
+/**
+ * xs_tcp_print_stats - display TCP socket-specifc stats
+ * @xprt: rpc_xprt struct containing statistics
+ * @seq: output file
+ *
+ */
+static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
+{
+ struct smb_xprt *transport = container_of(xprt, struct smb_xprt, xprt);
+ long idle_time = 0;
+
+ if (xprt_connected(xprt))
+ idle_time = (long)(jiffies - xprt->last_used) / HZ;
+
+ seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
+ transport->port,
+ xprt->stat.bind_count,
+ xprt->stat.connect_count,
+ xprt->stat.connect_time,
+ idle_time,
+ xprt->stat.sends,
+ xprt->stat.recvs,
+ xprt->stat.bad_xids,
+ xprt->stat.req_u,
+ xprt->stat.bklog_u);
+}
+
+static struct rpc_xprt_ops xs_smb_ops = {
+ .reserve_xprt = xprt_reserve_xprt,
+ .release_xprt = xs_tcp_release_xprt,
+ .rpcbind = xs_smb_rpcbind,
+ .set_port = xs_smb_set_port,
+ .connect = xs_tcp_connect,
+ .buf_alloc = rpc_malloc,
+ .buf_free = rpc_free,
+ .send_request = xs_smb_send_request,
+ .set_retrans_timeout = xprt_set_retrans_timeout_def,
+#if defined(CONFIG_NFS_V4_1)
+ .release_request = bc_release_request,
+#endif /* CONFIG_NFS_V4_1 */
+ .close = xs_tcp_close,
+ .destroy = xs_destroy,
+ .print_stats = xs_tcp_print_stats,
+};
+
+static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
+ unsigned int slot_table_size)
+{
+ struct rpc_xprt *xprt;
+ struct smb_xprt *new;
+
+ if (args->addrlen > sizeof(xprt->addr)) {
+ dprintk("RPC: xs_setup_xprt: address too large\n");
+ return ERR_PTR(-EBADF);
+ }
+
+ new = kzalloc(sizeof(*new), GFP_KERNEL);
+ if (new == NULL) {
+ dprintk("RPC: xs_setup_xprt: couldn't allocate "
+ "rpc_xprt\n");
+ return ERR_PTR(-ENOMEM);
+ }
+ xprt = &new->xprt;
+
+ xprt->max_reqs = slot_table_size;
+ xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
+ if (xprt->slot == NULL) {
+ kfree(xprt);
+ dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
+ "table\n");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ memcpy(&xprt->addr, args->dstaddr, args->addrlen);
+ xprt->addrlen = args->addrlen;
+ if (args->srcaddr)
+ memcpy(&new->addr, args->srcaddr, args->addrlen);
+
+ return xprt;
+}
+
+static const struct rpc_timeout xs_tcp_default_timeout = {
+ .to_initval = 60 * HZ,
+ .to_maxval = 60 * HZ,
+ .to_retries = 2,
+};
+
+/**
+ * xs_setup_tcp - Set up transport to use a TCP socket
+ * @args: rpc transport creation arguments
+ *
+ */
+static struct rpc_xprt *xs_setup_smb(struct xprt_create *args)
+{
+ struct sockaddr *addr = args->dstaddr;
+ struct rpc_xprt *xprt;
+ struct smb_xprt *transport;
+
+ xprt = xs_setup_xprt(args, xprt_smb_slot_table_entries);
+ if (IS_ERR(xprt))
+ return xprt;
+ transport = container_of(xprt, struct smb_xprt, xprt);
+
+ xprt->prot = IPPROTO_TCP;
+ xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
+ xprt->max_payload = SMB_MAX_FRAGMENT_SIZE;
+
+ xprt->bind_timeout = XS_BIND_TO;
+ xprt->connect_timeout = XS_TCP_CONN_TO;
+ xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
+ xprt->idle_timeout = XS_SMB_IDLE_DISC_TO;
+
+ xprt->ops = &xs_smb_ops;
+ xprt->timeout = &xs_tcp_default_timeout;
+
+ switch (addr->sa_family) {
+ case AF_INET:
+ if (((struct sockaddr_in *)addr)->sin_port == htons(0))
+ return ERR_PTR(-EINVAL);
+
+ xprt_set_bound(xprt);
+ INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4);
+ xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
+ break;
+ case AF_INET6:
+ if (((struct sockaddr_in6 *)addr)->sin6_port == htons(0))
+ return ERR_PTR(-EINVAL);
+
+ xprt_set_bound(xprt);
+ INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6);
+ xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
+ break;
+ default:
+ kfree(xprt);
+ return ERR_PTR(-EAFNOSUPPORT);
+ }
+
+ dprintk("RPC: set up xprt to %s (port %s) via %s\n",
+ xprt->address_strings[RPC_DISPLAY_ADDR],
+ xprt->address_strings[RPC_DISPLAY_PORT],
+ xprt->address_strings[RPC_DISPLAY_PROTO]);
+
+ if (try_module_get(THIS_MODULE))
+ return xprt;
+
+ kfree(xprt->slot);
+ kfree(xprt);
+ return ERR_PTR(-EINVAL);
+}
+
+static struct xprt_class xs_smb_transport = {
+ .list = LIST_HEAD_INIT(xs_smb_transport.list),
+ .name = "smb",
+ .owner = THIS_MODULE,
+ .ident = XPRT_TRANSPORT_SMB,
+ .setup = xs_setup_smb,
+};
+
+/**
+ * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
+ *
+ */
+int init_smb_xprt(void)
+{
+#ifdef RPC_DEBUG
+ if (!sunrpc_table_header)
+ sunrpc_table_header = register_sysctl_table(sunrpc_table);
+#endif
+
+ xprt_register_transport(&xs_smb_transport);
+
+ return 0;
+}
+
+/**
+ * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
+ *
+ */
+void cleanup_smb_xprt(void)
+{
+#ifdef RPC_DEBUG
+ if (sunrpc_table_header) {
+ unregister_sysctl_table(sunrpc_table_header);
+ sunrpc_table_header = NULL;
+ }
+#endif
+
+ xprt_unregister_transport(&xs_smb_transport);
+}
Add a new transport class for SMB traffic that lives in xprtsmb.c and a corresponding header file for making use of it. With this, it's possible to use the sunrpc layer to send and receive SMB traffic. Signed-off-by: Jeff Layton <jlayton@redhat.com> --- include/linux/sunrpc/xprtsmb.h | 59 ++ net/sunrpc/xprtsmb.c | 1720 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 1779 insertions(+), 0 deletions(-) create mode 100644 include/linux/sunrpc/xprtsmb.h create mode 100644 net/sunrpc/xprtsmb.c