+++ /dev/null
-// SPDX-License-Identifier: LGPL-2.1
-/*
- *
- * Copyright (C) International Business Machines Corp., 2002,2011
- * Author(s): Steve French (sfrench@us.ibm.com)
- *
- */
-#include <linux/fs.h>
-#include <linux/net.h>
-#include <linux/string.h>
-#include <linux/sched/mm.h>
-#include <linux/sched/signal.h>
-#include <linux/list.h>
-#include <linux/wait.h>
-#include <linux/slab.h>
-#include <linux/pagemap.h>
-#include <linux/ctype.h>
-#include <linux/utsname.h>
-#include <linux/mempool.h>
-#include <linux/delay.h>
-#include <linux/completion.h>
-#include <linux/kthread.h>
-#include <linux/pagevec.h>
-#include <linux/freezer.h>
-#include <linux/namei.h>
-#include <linux/uuid.h>
-#include <linux/uaccess.h>
-#include <asm/processor.h>
-#include <linux/inet.h>
-#include <linux/module.h>
-#include <keys/user-type.h>
-#include <net/ipv6.h>
-#include <linux/parser.h>
-#include <linux/bvec.h>
-#include "cifspdu.h"
-#include "cifsglob.h"
-#include "cifsproto.h"
-#include "cifs_unicode.h"
-#include "cifs_debug.h"
-#include "cifs_fs_sb.h"
-#include "ntlmssp.h"
-#include "nterr.h"
-#include "rfc1002pdu.h"
-#include "fscache.h"
-#include "smb2proto.h"
-#include "smbdirect.h"
-#include "dns_resolve.h"
-#ifdef CONFIG_CIFS_DFS_UPCALL
-#include "dfs.h"
-#include "dfs_cache.h"
-#endif
-#include "fs_context.h"
-#include "cifs_swn.h"
-
-extern mempool_t *cifs_req_poolp;
-extern bool disable_legacy_dialects;
-
-/* FIXME: should these be tunable? */
-#define TLINK_ERROR_EXPIRE (1 * HZ)
-#define TLINK_IDLE_EXPIRE (600 * HZ)
-
-/* Drop the connection to not overload the server */
-#define NUM_STATUS_IO_TIMEOUT 5
-
-static int ip_connect(struct TCP_Server_Info *server);
-static int generic_ip_connect(struct TCP_Server_Info *server);
-static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
-static void cifs_prune_tlinks(struct work_struct *work);
-
-/*
- * Resolve hostname and set ip addr in tcp ses. Useful for hostnames that may
- * get their ip addresses changed at some point.
- *
- * This should be called with server->srv_mutex held.
- */
-static int reconn_set_ipaddr_from_hostname(struct TCP_Server_Info *server)
-{
- int rc;
- int len;
- char *unc;
- struct sockaddr_storage ss;
-
- if (!server->hostname)
- return -EINVAL;
-
- /* if server hostname isn't populated, there's nothing to do here */
- if (server->hostname[0] == '\0')
- return 0;
-
- len = strlen(server->hostname) + 3;
-
- unc = kmalloc(len, GFP_KERNEL);
- if (!unc) {
- cifs_dbg(FYI, "%s: failed to create UNC path\n", __func__);
- return -ENOMEM;
- }
- scnprintf(unc, len, "\\\\%s", server->hostname);
-
- spin_lock(&server->srv_lock);
- ss = server->dstaddr;
- spin_unlock(&server->srv_lock);
-
- rc = dns_resolve_server_name_to_ip(unc, (struct sockaddr *)&ss, NULL);
- kfree(unc);
-
- if (rc < 0) {
- cifs_dbg(FYI, "%s: failed to resolve server part of %s to IP: %d\n",
- __func__, server->hostname, rc);
- } else {
- spin_lock(&server->srv_lock);
- memcpy(&server->dstaddr, &ss, sizeof(server->dstaddr));
- spin_unlock(&server->srv_lock);
- rc = 0;
- }
-
- return rc;
-}
-
-static void smb2_query_server_interfaces(struct work_struct *work)
-{
- int rc;
- struct cifs_tcon *tcon = container_of(work,
- struct cifs_tcon,
- query_interfaces.work);
-
- /*
- * query server network interfaces, in case they change
- */
- rc = SMB3_request_interfaces(0, tcon, false);
- if (rc) {
- cifs_dbg(FYI, "%s: failed to query server interfaces: %d\n",
- __func__, rc);
- }
-
- queue_delayed_work(cifsiod_wq, &tcon->query_interfaces,
- (SMB_INTERFACE_POLL_INTERVAL * HZ));
-}
-
-/*
- * Update the tcpStatus for the server.
- * This is used to signal the cifsd thread to call cifs_reconnect
- * ONLY cifsd thread should call cifs_reconnect. For any other
- * thread, use this function
- *
- * @server: the tcp ses for which reconnect is needed
- * @all_channels: if this needs to be done for all channels
- */
-void
-cifs_signal_cifsd_for_reconnect(struct TCP_Server_Info *server,
- bool all_channels)
-{
- struct TCP_Server_Info *pserver;
- struct cifs_ses *ses;
- int i;
-
- /* If server is a channel, select the primary channel */
- pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
-
- spin_lock(&pserver->srv_lock);
- if (!all_channels) {
- pserver->tcpStatus = CifsNeedReconnect;
- spin_unlock(&pserver->srv_lock);
- return;
- }
- spin_unlock(&pserver->srv_lock);
-
- spin_lock(&cifs_tcp_ses_lock);
- list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
- spin_lock(&ses->chan_lock);
- for (i = 0; i < ses->chan_count; i++) {
- spin_lock(&ses->chans[i].server->srv_lock);
- ses->chans[i].server->tcpStatus = CifsNeedReconnect;
- spin_unlock(&ses->chans[i].server->srv_lock);
- }
- spin_unlock(&ses->chan_lock);
- }
- spin_unlock(&cifs_tcp_ses_lock);
-}
-
-/*
- * Mark all sessions and tcons for reconnect.
- * IMPORTANT: make sure that this gets called only from
- * cifsd thread. For any other thread, use
- * cifs_signal_cifsd_for_reconnect
- *
- * @server: the tcp ses for which reconnect is needed
- * @server needs to be previously set to CifsNeedReconnect.
- * @mark_smb_session: whether even sessions need to be marked
- */
-void
-cifs_mark_tcp_ses_conns_for_reconnect(struct TCP_Server_Info *server,
- bool mark_smb_session)
-{
- struct TCP_Server_Info *pserver;
- struct cifs_ses *ses, *nses;
- struct cifs_tcon *tcon;
-
- /*
- * before reconnecting the tcp session, mark the smb session (uid) and the tid bad so they
- * are not used until reconnected.
- */
- cifs_dbg(FYI, "%s: marking necessary sessions and tcons for reconnect\n", __func__);
-
- /* If server is a channel, select the primary channel */
- pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
-
-
- spin_lock(&cifs_tcp_ses_lock);
- list_for_each_entry_safe(ses, nses, &pserver->smb_ses_list, smb_ses_list) {
- /* check if iface is still active */
- if (!cifs_chan_is_iface_active(ses, server))
- cifs_chan_update_iface(ses, server);
-
- spin_lock(&ses->chan_lock);
- if (!mark_smb_session && cifs_chan_needs_reconnect(ses, server)) {
- spin_unlock(&ses->chan_lock);
- continue;
- }
-
- if (mark_smb_session)
- CIFS_SET_ALL_CHANS_NEED_RECONNECT(ses);
- else
- cifs_chan_set_need_reconnect(ses, server);
-
- cifs_dbg(FYI, "%s: channel connect bitmap: 0x%lx\n",
- __func__, ses->chans_need_reconnect);
-
- /* If all channels need reconnect, then tcon needs reconnect */
- if (!mark_smb_session && !CIFS_ALL_CHANS_NEED_RECONNECT(ses)) {
- spin_unlock(&ses->chan_lock);
- continue;
- }
- spin_unlock(&ses->chan_lock);
-
- spin_lock(&ses->ses_lock);
- ses->ses_status = SES_NEED_RECON;
- spin_unlock(&ses->ses_lock);
-
- list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
- tcon->need_reconnect = true;
- spin_lock(&tcon->tc_lock);
- tcon->status = TID_NEED_RECON;
- spin_unlock(&tcon->tc_lock);
- }
- if (ses->tcon_ipc) {
- ses->tcon_ipc->need_reconnect = true;
- spin_lock(&ses->tcon_ipc->tc_lock);
- ses->tcon_ipc->status = TID_NEED_RECON;
- spin_unlock(&ses->tcon_ipc->tc_lock);
- }
- }
- spin_unlock(&cifs_tcp_ses_lock);
-}
-
-static void
-cifs_abort_connection(struct TCP_Server_Info *server)
-{
- struct mid_q_entry *mid, *nmid;
- struct list_head retry_list;
-
- server->maxBuf = 0;
- server->max_read = 0;
-
- /* do not want to be sending data on a socket we are freeing */
- cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
- cifs_server_lock(server);
- if (server->ssocket) {
- cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n", server->ssocket->state,
- server->ssocket->flags);
- kernel_sock_shutdown(server->ssocket, SHUT_WR);
- cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n", server->ssocket->state,
- server->ssocket->flags);
- sock_release(server->ssocket);
- server->ssocket = NULL;
- }
- server->sequence_number = 0;
- server->session_estab = false;
- kfree_sensitive(server->session_key.response);
- server->session_key.response = NULL;
- server->session_key.len = 0;
- server->lstrp = jiffies;
-
- /* mark submitted MIDs for retry and issue callback */
- INIT_LIST_HEAD(&retry_list);
- cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
- spin_lock(&server->mid_lock);
- list_for_each_entry_safe(mid, nmid, &server->pending_mid_q, qhead) {
- kref_get(&mid->refcount);
- if (mid->mid_state == MID_REQUEST_SUBMITTED)
- mid->mid_state = MID_RETRY_NEEDED;
- list_move(&mid->qhead, &retry_list);
- mid->mid_flags |= MID_DELETED;
- }
- spin_unlock(&server->mid_lock);
- cifs_server_unlock(server);
-
- cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
- list_for_each_entry_safe(mid, nmid, &retry_list, qhead) {
- list_del_init(&mid->qhead);
- mid->callback(mid);
- release_mid(mid);
- }
-
- if (cifs_rdma_enabled(server)) {
- cifs_server_lock(server);
- smbd_destroy(server);
- cifs_server_unlock(server);
- }
-}
-
-static bool cifs_tcp_ses_needs_reconnect(struct TCP_Server_Info *server, int num_targets)
-{
- spin_lock(&server->srv_lock);
- server->nr_targets = num_targets;
- if (server->tcpStatus == CifsExiting) {
- /* the demux thread will exit normally next time through the loop */
- spin_unlock(&server->srv_lock);
- wake_up(&server->response_q);
- return false;
- }
-
- cifs_dbg(FYI, "Mark tcp session as need reconnect\n");
- trace_smb3_reconnect(server->CurrentMid, server->conn_id,
- server->hostname);
- server->tcpStatus = CifsNeedReconnect;
-
- spin_unlock(&server->srv_lock);
- return true;
-}
-
-/*
- * cifs tcp session reconnection
- *
- * mark tcp session as reconnecting so temporarily locked
- * mark all smb sessions as reconnecting for tcp session
- * reconnect tcp session
- * wake up waiters on reconnection? - (not needed currently)
- *
- * if mark_smb_session is passed as true, unconditionally mark
- * the smb session (and tcon) for reconnect as well. This value
- * doesn't really matter for non-multichannel scenario.
- *
- */
-static int __cifs_reconnect(struct TCP_Server_Info *server,
- bool mark_smb_session)
-{
- int rc = 0;
-
- if (!cifs_tcp_ses_needs_reconnect(server, 1))
- return 0;
-
- cifs_mark_tcp_ses_conns_for_reconnect(server, mark_smb_session);
-
- cifs_abort_connection(server);
-
- do {
- try_to_freeze();
- cifs_server_lock(server);
-
- if (!cifs_swn_set_server_dstaddr(server)) {
- /* resolve the hostname again to make sure that IP address is up-to-date */
- rc = reconn_set_ipaddr_from_hostname(server);
- cifs_dbg(FYI, "%s: reconn_set_ipaddr_from_hostname: rc=%d\n", __func__, rc);
- }
-
- if (cifs_rdma_enabled(server))
- rc = smbd_reconnect(server);
- else
- rc = generic_ip_connect(server);
- if (rc) {
- cifs_server_unlock(server);
- cifs_dbg(FYI, "%s: reconnect error %d\n", __func__, rc);
- msleep(3000);
- } else {
- atomic_inc(&tcpSesReconnectCount);
- set_credits(server, 1);
- spin_lock(&server->srv_lock);
- if (server->tcpStatus != CifsExiting)
- server->tcpStatus = CifsNeedNegotiate;
- spin_unlock(&server->srv_lock);
- cifs_swn_reset_server_dstaddr(server);
- cifs_server_unlock(server);
- mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
- }
- } while (server->tcpStatus == CifsNeedReconnect);
-
- spin_lock(&server->srv_lock);
- if (server->tcpStatus == CifsNeedNegotiate)
- mod_delayed_work(cifsiod_wq, &server->echo, 0);
- spin_unlock(&server->srv_lock);
-
- wake_up(&server->response_q);
- return rc;
-}
-
-#ifdef CONFIG_CIFS_DFS_UPCALL
-static int __reconnect_target_unlocked(struct TCP_Server_Info *server, const char *target)
-{
- int rc;
- char *hostname;
-
- if (!cifs_swn_set_server_dstaddr(server)) {
- if (server->hostname != target) {
- hostname = extract_hostname(target);
- if (!IS_ERR(hostname)) {
- spin_lock(&server->srv_lock);
- kfree(server->hostname);
- server->hostname = hostname;
- spin_unlock(&server->srv_lock);
- } else {
- cifs_dbg(FYI, "%s: couldn't extract hostname or address from dfs target: %ld\n",
- __func__, PTR_ERR(hostname));
- cifs_dbg(FYI, "%s: default to last target server: %s\n", __func__,
- server->hostname);
- }
- }
- /* resolve the hostname again to make sure that IP address is up-to-date. */
- rc = reconn_set_ipaddr_from_hostname(server);
- cifs_dbg(FYI, "%s: reconn_set_ipaddr_from_hostname: rc=%d\n", __func__, rc);
- }
- /* Reconnect the socket */
- if (cifs_rdma_enabled(server))
- rc = smbd_reconnect(server);
- else
- rc = generic_ip_connect(server);
-
- return rc;
-}
-
-static int reconnect_target_unlocked(struct TCP_Server_Info *server, struct dfs_cache_tgt_list *tl,
- struct dfs_cache_tgt_iterator **target_hint)
-{
- int rc;
- struct dfs_cache_tgt_iterator *tit;
-
- *target_hint = NULL;
-
- /* If dfs target list is empty, then reconnect to last server */
- tit = dfs_cache_get_tgt_iterator(tl);
- if (!tit)
- return __reconnect_target_unlocked(server, server->hostname);
-
- /* Otherwise, try every dfs target in @tl */
- for (; tit; tit = dfs_cache_get_next_tgt(tl, tit)) {
- rc = __reconnect_target_unlocked(server, dfs_cache_get_tgt_name(tit));
- if (!rc) {
- *target_hint = tit;
- break;
- }
- }
- return rc;
-}
-
-static int reconnect_dfs_server(struct TCP_Server_Info *server)
-{
- int rc = 0;
- struct dfs_cache_tgt_list tl = DFS_CACHE_TGT_LIST_INIT(tl);
- struct dfs_cache_tgt_iterator *target_hint = NULL;
- int num_targets = 0;
-
- /*
- * Determine the number of dfs targets the referral path in @cifs_sb resolves to.
- *
- * smb2_reconnect() needs to know how long it should wait based upon the number of dfs
- * targets (server->nr_targets). It's also possible that the cached referral was cleared
- * through /proc/fs/cifs/dfscache or the target list is empty due to server settings after
- * refreshing the referral, so, in this case, default it to 1.
- */
- mutex_lock(&server->refpath_lock);
- if (!dfs_cache_noreq_find(server->leaf_fullpath + 1, NULL, &tl))
- num_targets = dfs_cache_get_nr_tgts(&tl);
- mutex_unlock(&server->refpath_lock);
- if (!num_targets)
- num_targets = 1;
-
- if (!cifs_tcp_ses_needs_reconnect(server, num_targets))
- return 0;
-
- /*
- * Unconditionally mark all sessions & tcons for reconnect as we might be connecting to a
- * different server or share during failover. It could be improved by adding some logic to
- * only do that in case it connects to a different server or share, though.
- */
- cifs_mark_tcp_ses_conns_for_reconnect(server, true);
-
- cifs_abort_connection(server);
-
- do {
- try_to_freeze();
- cifs_server_lock(server);
-
- rc = reconnect_target_unlocked(server, &tl, &target_hint);
- if (rc) {
- /* Failed to reconnect socket */
- cifs_server_unlock(server);
- cifs_dbg(FYI, "%s: reconnect error %d\n", __func__, rc);
- msleep(3000);
- continue;
- }
- /*
- * Socket was created. Update tcp session status to CifsNeedNegotiate so that a
- * process waiting for reconnect will know it needs to re-establish session and tcon
- * through the reconnected target server.
- */
- atomic_inc(&tcpSesReconnectCount);
- set_credits(server, 1);
- spin_lock(&server->srv_lock);
- if (server->tcpStatus != CifsExiting)
- server->tcpStatus = CifsNeedNegotiate;
- spin_unlock(&server->srv_lock);
- cifs_swn_reset_server_dstaddr(server);
- cifs_server_unlock(server);
- mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
- } while (server->tcpStatus == CifsNeedReconnect);
-
- mutex_lock(&server->refpath_lock);
- dfs_cache_noreq_update_tgthint(server->leaf_fullpath + 1, target_hint);
- mutex_unlock(&server->refpath_lock);
- dfs_cache_free_tgts(&tl);
-
- /* Need to set up echo worker again once connection has been established */
- spin_lock(&server->srv_lock);
- if (server->tcpStatus == CifsNeedNegotiate)
- mod_delayed_work(cifsiod_wq, &server->echo, 0);
- spin_unlock(&server->srv_lock);
-
- wake_up(&server->response_q);
- return rc;
-}
-
-int cifs_reconnect(struct TCP_Server_Info *server, bool mark_smb_session)
-{
- mutex_lock(&server->refpath_lock);
- if (!server->leaf_fullpath) {
- mutex_unlock(&server->refpath_lock);
- return __cifs_reconnect(server, mark_smb_session);
- }
- mutex_unlock(&server->refpath_lock);
-
- return reconnect_dfs_server(server);
-}
-#else
-int cifs_reconnect(struct TCP_Server_Info *server, bool mark_smb_session)
-{
- return __cifs_reconnect(server, mark_smb_session);
-}
-#endif
-
-static void
-cifs_echo_request(struct work_struct *work)
-{
- int rc;
- struct TCP_Server_Info *server = container_of(work,
- struct TCP_Server_Info, echo.work);
-
- /*
- * We cannot send an echo if it is disabled.
- * Also, no need to ping if we got a response recently.
- */
-
- if (server->tcpStatus == CifsNeedReconnect ||
- server->tcpStatus == CifsExiting ||
- server->tcpStatus == CifsNew ||
- (server->ops->can_echo && !server->ops->can_echo(server)) ||
- time_before(jiffies, server->lstrp + server->echo_interval - HZ))
- goto requeue_echo;
-
- rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
- cifs_server_dbg(FYI, "send echo request: rc = %d\n", rc);
-
- /* Check witness registrations */
- cifs_swn_check();
-
-requeue_echo:
- queue_delayed_work(cifsiod_wq, &server->echo, server->echo_interval);
-}
-
-static bool
-allocate_buffers(struct TCP_Server_Info *server)
-{
- if (!server->bigbuf) {
- server->bigbuf = (char *)cifs_buf_get();
- if (!server->bigbuf) {
- cifs_server_dbg(VFS, "No memory for large SMB response\n");
- msleep(3000);
- /* retry will check if exiting */
- return false;
- }
- } else if (server->large_buf) {
- /* we are reusing a dirty large buf, clear its start */
- memset(server->bigbuf, 0, HEADER_SIZE(server));
- }
-
- if (!server->smallbuf) {
- server->smallbuf = (char *)cifs_small_buf_get();
- if (!server->smallbuf) {
- cifs_server_dbg(VFS, "No memory for SMB response\n");
- msleep(1000);
- /* retry will check if exiting */
- return false;
- }
- /* beginning of smb buffer is cleared in our buf_get */
- } else {
- /* if existing small buf clear beginning */
- memset(server->smallbuf, 0, HEADER_SIZE(server));
- }
-
- return true;
-}
-
-static bool
-server_unresponsive(struct TCP_Server_Info *server)
-{
- /*
- * We need to wait 3 echo intervals to make sure we handle such
- * situations right:
- * 1s client sends a normal SMB request
- * 2s client gets a response
- * 30s echo workqueue job pops, and decides we got a response recently
- * and don't need to send another
- * ...
- * 65s kernel_recvmsg times out, and we see that we haven't gotten
- * a response in >60s.
- */
- spin_lock(&server->srv_lock);
- if ((server->tcpStatus == CifsGood ||
- server->tcpStatus == CifsNeedNegotiate) &&
- (!server->ops->can_echo || server->ops->can_echo(server)) &&
- time_after(jiffies, server->lstrp + 3 * server->echo_interval)) {
- spin_unlock(&server->srv_lock);
- cifs_server_dbg(VFS, "has not responded in %lu seconds. Reconnecting...\n",
- (3 * server->echo_interval) / HZ);
- cifs_reconnect(server, false);
- return true;
- }
- spin_unlock(&server->srv_lock);
-
- return false;
-}
-
-static inline bool
-zero_credits(struct TCP_Server_Info *server)
-{
- int val;
-
- spin_lock(&server->req_lock);
- val = server->credits + server->echo_credits + server->oplock_credits;
- if (server->in_flight == 0 && val == 0) {
- spin_unlock(&server->req_lock);
- return true;
- }
- spin_unlock(&server->req_lock);
- return false;
-}
-
-static int
-cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
-{
- int length = 0;
- int total_read;
-
- for (total_read = 0; msg_data_left(smb_msg); total_read += length) {
- try_to_freeze();
-
- /* reconnect if no credits and no requests in flight */
- if (zero_credits(server)) {
- cifs_reconnect(server, false);
- return -ECONNABORTED;
- }
-
- if (server_unresponsive(server))
- return -ECONNABORTED;
- if (cifs_rdma_enabled(server) && server->smbd_conn)
- length = smbd_recv(server->smbd_conn, smb_msg);
- else
- length = sock_recvmsg(server->ssocket, smb_msg, 0);
-
- spin_lock(&server->srv_lock);
- if (server->tcpStatus == CifsExiting) {
- spin_unlock(&server->srv_lock);
- return -ESHUTDOWN;
- }
-
- if (server->tcpStatus == CifsNeedReconnect) {
- spin_unlock(&server->srv_lock);
- cifs_reconnect(server, false);
- return -ECONNABORTED;
- }
- spin_unlock(&server->srv_lock);
-
- if (length == -ERESTARTSYS ||
- length == -EAGAIN ||
- length == -EINTR) {
- /*
- * Minimum sleep to prevent looping, allowing socket
- * to clear and app threads to set tcpStatus
- * CifsNeedReconnect if server hung.
- */
- usleep_range(1000, 2000);
- length = 0;
- continue;
- }
-
- if (length <= 0) {
- cifs_dbg(FYI, "Received no data or error: %d\n", length);
- cifs_reconnect(server, false);
- return -ECONNABORTED;
- }
- }
- return total_read;
-}
-
-int
-cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
- unsigned int to_read)
-{
- struct msghdr smb_msg = {};
- struct kvec iov = {.iov_base = buf, .iov_len = to_read};
- iov_iter_kvec(&smb_msg.msg_iter, ITER_DEST, &iov, 1, to_read);
-
- return cifs_readv_from_socket(server, &smb_msg);
-}
-
-ssize_t
-cifs_discard_from_socket(struct TCP_Server_Info *server, size_t to_read)
-{
- struct msghdr smb_msg = {};
-
- /*
- * iov_iter_discard already sets smb_msg.type and count and iov_offset
- * and cifs_readv_from_socket sets msg_control and msg_controllen
- * so little to initialize in struct msghdr
- */
- iov_iter_discard(&smb_msg.msg_iter, ITER_DEST, to_read);
-
- return cifs_readv_from_socket(server, &smb_msg);
-}
-
-int
-cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
- unsigned int page_offset, unsigned int to_read)
-{
- struct msghdr smb_msg = {};
- struct bio_vec bv;
-
- bvec_set_page(&bv, page, to_read, page_offset);
- iov_iter_bvec(&smb_msg.msg_iter, ITER_DEST, &bv, 1, to_read);
- return cifs_readv_from_socket(server, &smb_msg);
-}
-
-int
-cifs_read_iter_from_socket(struct TCP_Server_Info *server, struct iov_iter *iter,
- unsigned int to_read)
-{
- struct msghdr smb_msg = { .msg_iter = *iter };
- int ret;
-
- iov_iter_truncate(&smb_msg.msg_iter, to_read);
- ret = cifs_readv_from_socket(server, &smb_msg);
- if (ret > 0)
- iov_iter_advance(iter, ret);
- return ret;
-}
-
-static bool
-is_smb_response(struct TCP_Server_Info *server, unsigned char type)
-{
- /*
- * The first byte big endian of the length field,
- * is actually not part of the length but the type
- * with the most common, zero, as regular data.
- */
- switch (type) {
- case RFC1002_SESSION_MESSAGE:
- /* Regular SMB response */
- return true;
- case RFC1002_SESSION_KEEP_ALIVE:
- cifs_dbg(FYI, "RFC 1002 session keep alive\n");
- break;
- case RFC1002_POSITIVE_SESSION_RESPONSE:
- cifs_dbg(FYI, "RFC 1002 positive session response\n");
- break;
- case RFC1002_NEGATIVE_SESSION_RESPONSE:
- /*
- * We get this from Windows 98 instead of an error on
- * SMB negprot response.
- */
- cifs_dbg(FYI, "RFC 1002 negative session response\n");
- /* give server a second to clean up */
- msleep(1000);
- /*
- * Always try 445 first on reconnect since we get NACK
- * on some if we ever connected to port 139 (the NACK
- * is since we do not begin with RFC1001 session
- * initialize frame).
- */
- cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
- cifs_reconnect(server, true);
- break;
- default:
- cifs_server_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
- cifs_reconnect(server, true);
- }
-
- return false;
-}
-
-void
-dequeue_mid(struct mid_q_entry *mid, bool malformed)
-{
-#ifdef CONFIG_CIFS_STATS2
- mid->when_received = jiffies;
-#endif
- spin_lock(&mid->server->mid_lock);
- if (!malformed)
- mid->mid_state = MID_RESPONSE_RECEIVED;
- else
- mid->mid_state = MID_RESPONSE_MALFORMED;
- /*
- * Trying to handle/dequeue a mid after the send_recv()
- * function has finished processing it is a bug.
- */
- if (mid->mid_flags & MID_DELETED) {
- spin_unlock(&mid->server->mid_lock);
- pr_warn_once("trying to dequeue a deleted mid\n");
- } else {
- list_del_init(&mid->qhead);
- mid->mid_flags |= MID_DELETED;
- spin_unlock(&mid->server->mid_lock);
- }
-}
-
-static unsigned int
-smb2_get_credits_from_hdr(char *buffer, struct TCP_Server_Info *server)
-{
- struct smb2_hdr *shdr = (struct smb2_hdr *)buffer;
-
- /*
- * SMB1 does not use credits.
- */
- if (is_smb1(server))
- return 0;
-
- return le16_to_cpu(shdr->CreditRequest);
-}
-
-static void
-handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
- char *buf, int malformed)
-{
- if (server->ops->check_trans2 &&
- server->ops->check_trans2(mid, server, buf, malformed))
- return;
- mid->credits_received = smb2_get_credits_from_hdr(buf, server);
- mid->resp_buf = buf;
- mid->large_buf = server->large_buf;
- /* Was previous buf put in mpx struct for multi-rsp? */
- if (!mid->multiRsp) {
- /* smb buffer will be freed by user thread */
- if (server->large_buf)
- server->bigbuf = NULL;
- else
- server->smallbuf = NULL;
- }
- dequeue_mid(mid, malformed);
-}
-
-int
-cifs_enable_signing(struct TCP_Server_Info *server, bool mnt_sign_required)
-{
- bool srv_sign_required = server->sec_mode & server->vals->signing_required;
- bool srv_sign_enabled = server->sec_mode & server->vals->signing_enabled;
- bool mnt_sign_enabled;
-
- /*
- * Is signing required by mnt options? If not then check
- * global_secflags to see if it is there.
- */
- if (!mnt_sign_required)
- mnt_sign_required = ((global_secflags & CIFSSEC_MUST_SIGN) ==
- CIFSSEC_MUST_SIGN);
-
- /*
- * If signing is required then it's automatically enabled too,
- * otherwise, check to see if the secflags allow it.
- */
- mnt_sign_enabled = mnt_sign_required ? mnt_sign_required :
- (global_secflags & CIFSSEC_MAY_SIGN);
-
- /* If server requires signing, does client allow it? */
- if (srv_sign_required) {
- if (!mnt_sign_enabled) {
- cifs_dbg(VFS, "Server requires signing, but it's disabled in SecurityFlags!\n");
- return -EOPNOTSUPP;
- }
- server->sign = true;
- }
-
- /* If client requires signing, does server allow it? */
- if (mnt_sign_required) {
- if (!srv_sign_enabled) {
- cifs_dbg(VFS, "Server does not support signing!\n");
- return -EOPNOTSUPP;
- }
- server->sign = true;
- }
-
- if (cifs_rdma_enabled(server) && server->sign)
- cifs_dbg(VFS, "Signing is enabled, and RDMA read/write will be disabled\n");
-
- return 0;
-}
-
-
-static void clean_demultiplex_info(struct TCP_Server_Info *server)
-{
- int length;
-
- /* take it off the list, if it's not already */
- spin_lock(&server->srv_lock);
- list_del_init(&server->tcp_ses_list);
- spin_unlock(&server->srv_lock);
-
- cancel_delayed_work_sync(&server->echo);
-
- spin_lock(&server->srv_lock);
- server->tcpStatus = CifsExiting;
- spin_unlock(&server->srv_lock);
- wake_up_all(&server->response_q);
-
- /* check if we have blocked requests that need to free */
- spin_lock(&server->req_lock);
- if (server->credits <= 0)
- server->credits = 1;
- spin_unlock(&server->req_lock);
- /*
- * Although there should not be any requests blocked on this queue it
- * can not hurt to be paranoid and try to wake up requests that may
- * haven been blocked when more than 50 at time were on the wire to the
- * same server - they now will see the session is in exit state and get
- * out of SendReceive.
- */
- wake_up_all(&server->request_q);
- /* give those requests time to exit */
- msleep(125);
- if (cifs_rdma_enabled(server))
- smbd_destroy(server);
- if (server->ssocket) {
- sock_release(server->ssocket);
- server->ssocket = NULL;
- }
-
- if (!list_empty(&server->pending_mid_q)) {
- struct list_head dispose_list;
- struct mid_q_entry *mid_entry;
- struct list_head *tmp, *tmp2;
-
- INIT_LIST_HEAD(&dispose_list);
- spin_lock(&server->mid_lock);
- list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
- mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
- cifs_dbg(FYI, "Clearing mid %llu\n", mid_entry->mid);
- kref_get(&mid_entry->refcount);
- mid_entry->mid_state = MID_SHUTDOWN;
- list_move(&mid_entry->qhead, &dispose_list);
- mid_entry->mid_flags |= MID_DELETED;
- }
- spin_unlock(&server->mid_lock);
-
- /* now walk dispose list and issue callbacks */
- list_for_each_safe(tmp, tmp2, &dispose_list) {
- mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
- cifs_dbg(FYI, "Callback mid %llu\n", mid_entry->mid);
- list_del_init(&mid_entry->qhead);
- mid_entry->callback(mid_entry);
- release_mid(mid_entry);
- }
- /* 1/8th of sec is more than enough time for them to exit */
- msleep(125);
- }
-
- if (!list_empty(&server->pending_mid_q)) {
- /*
- * mpx threads have not exited yet give them at least the smb
- * send timeout time for long ops.
- *
- * Due to delays on oplock break requests, we need to wait at
- * least 45 seconds before giving up on a request getting a
- * response and going ahead and killing cifsd.
- */
- cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
- msleep(46000);
- /*
- * If threads still have not exited they are probably never
- * coming home not much else we can do but free the memory.
- */
- }
-
- kfree(server->origin_fullpath);
- kfree(server->leaf_fullpath);
- kfree(server);
-
- length = atomic_dec_return(&tcpSesAllocCount);
- if (length > 0)
- mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
-}
-
-static int
-standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
-{
- int length;
- char *buf = server->smallbuf;
- unsigned int pdu_length = server->pdu_size;
-
- /* make sure this will fit in a large buffer */
- if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) -
- HEADER_PREAMBLE_SIZE(server)) {
- cifs_server_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
- cifs_reconnect(server, true);
- return -ECONNABORTED;
- }
-
- /* switch to large buffer if too big for a small one */
- if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
- server->large_buf = true;
- memcpy(server->bigbuf, buf, server->total_read);
- buf = server->bigbuf;
- }
-
- /* now read the rest */
- length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
- pdu_length - MID_HEADER_SIZE(server));
-
- if (length < 0)
- return length;
- server->total_read += length;
-
- dump_smb(buf, server->total_read);
-
- return cifs_handle_standard(server, mid);
-}
-
-int
-cifs_handle_standard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
-{
- char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
- int rc;
-
- /*
- * We know that we received enough to get to the MID as we
- * checked the pdu_length earlier. Now check to see
- * if the rest of the header is OK.
- *
- * 48 bytes is enough to display the header and a little bit
- * into the payload for debugging purposes.
- */
- rc = server->ops->check_message(buf, server->total_read, server);
- if (rc)
- cifs_dump_mem("Bad SMB: ", buf,
- min_t(unsigned int, server->total_read, 48));
-
- if (server->ops->is_session_expired &&
- server->ops->is_session_expired(buf)) {
- cifs_reconnect(server, true);
- return -1;
- }
-
- if (server->ops->is_status_pending &&
- server->ops->is_status_pending(buf, server))
- return -1;
-
- if (!mid)
- return rc;
-
- handle_mid(mid, server, buf, rc);
- return 0;
-}
-
-static void
-smb2_add_credits_from_hdr(char *buffer, struct TCP_Server_Info *server)
-{
- struct smb2_hdr *shdr = (struct smb2_hdr *)buffer;
- int scredits, in_flight;
-
- /*
- * SMB1 does not use credits.
- */
- if (is_smb1(server))
- return;
-
- if (shdr->CreditRequest) {
- spin_lock(&server->req_lock);
- server->credits += le16_to_cpu(shdr->CreditRequest);
- scredits = server->credits;
- in_flight = server->in_flight;
- spin_unlock(&server->req_lock);
- wake_up(&server->request_q);
-
- trace_smb3_hdr_credits(server->CurrentMid,
- server->conn_id, server->hostname, scredits,
- le16_to_cpu(shdr->CreditRequest), in_flight);
- cifs_server_dbg(FYI, "%s: added %u credits total=%d\n",
- __func__, le16_to_cpu(shdr->CreditRequest),
- scredits);
- }
-}
-
-
-static int
-cifs_demultiplex_thread(void *p)
-{
- int i, num_mids, length;
- struct TCP_Server_Info *server = p;
- unsigned int pdu_length;
- unsigned int next_offset;
- char *buf = NULL;
- struct task_struct *task_to_wake = NULL;
- struct mid_q_entry *mids[MAX_COMPOUND];
- char *bufs[MAX_COMPOUND];
- unsigned int noreclaim_flag, num_io_timeout = 0;
-
- noreclaim_flag = memalloc_noreclaim_save();
- cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
-
- length = atomic_inc_return(&tcpSesAllocCount);
- if (length > 1)
- mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
-
- set_freezable();
- allow_kernel_signal(SIGKILL);
- while (server->tcpStatus != CifsExiting) {
- if (try_to_freeze())
- continue;
-
- if (!allocate_buffers(server))
- continue;
-
- server->large_buf = false;
- buf = server->smallbuf;
- pdu_length = 4; /* enough to get RFC1001 header */
-
- length = cifs_read_from_socket(server, buf, pdu_length);
- if (length < 0)
- continue;
-
- if (is_smb1(server))
- server->total_read = length;
- else
- server->total_read = 0;
-
- /*
- * The right amount was read from socket - 4 bytes,
- * so we can now interpret the length field.
- */
- pdu_length = get_rfc1002_length(buf);
-
- cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
- if (!is_smb_response(server, buf[0]))
- continue;
-next_pdu:
- server->pdu_size = pdu_length;
-
- /* make sure we have enough to get to the MID */
- if (server->pdu_size < MID_HEADER_SIZE(server)) {
- cifs_server_dbg(VFS, "SMB response too short (%u bytes)\n",
- server->pdu_size);
- cifs_reconnect(server, true);
- continue;
- }
-
- /* read down to the MID */
- length = cifs_read_from_socket(server,
- buf + HEADER_PREAMBLE_SIZE(server),
- MID_HEADER_SIZE(server));
- if (length < 0)
- continue;
- server->total_read += length;
-
- if (server->ops->next_header) {
- next_offset = server->ops->next_header(buf);
- if (next_offset)
- server->pdu_size = next_offset;
- }
-
- memset(mids, 0, sizeof(mids));
- memset(bufs, 0, sizeof(bufs));
- num_mids = 0;
-
- if (server->ops->is_transform_hdr &&
- server->ops->receive_transform &&
- server->ops->is_transform_hdr(buf)) {
- length = server->ops->receive_transform(server,
- mids,
- bufs,
- &num_mids);
- } else {
- mids[0] = server->ops->find_mid(server, buf);
- bufs[0] = buf;
- num_mids = 1;
-
- if (!mids[0] || !mids[0]->receive)
- length = standard_receive3(server, mids[0]);
- else
- length = mids[0]->receive(server, mids[0]);
- }
-
- if (length < 0) {
- for (i = 0; i < num_mids; i++)
- if (mids[i])
- release_mid(mids[i]);
- continue;
- }
-
- if (server->ops->is_status_io_timeout &&
- server->ops->is_status_io_timeout(buf)) {
- num_io_timeout++;
- if (num_io_timeout > NUM_STATUS_IO_TIMEOUT) {
- cifs_reconnect(server, false);
- num_io_timeout = 0;
- continue;
- }
- }
-
- server->lstrp = jiffies;
-
- for (i = 0; i < num_mids; i++) {
- if (mids[i] != NULL) {
- mids[i]->resp_buf_size = server->pdu_size;
-
- if (bufs[i] && server->ops->is_network_name_deleted)
- server->ops->is_network_name_deleted(bufs[i],
- server);
-
- if (!mids[i]->multiRsp || mids[i]->multiEnd)
- mids[i]->callback(mids[i]);
-
- release_mid(mids[i]);
- } else if (server->ops->is_oplock_break &&
- server->ops->is_oplock_break(bufs[i],
- server)) {
- smb2_add_credits_from_hdr(bufs[i], server);
- cifs_dbg(FYI, "Received oplock break\n");
- } else {
- cifs_server_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
- atomic_read(&mid_count));
- cifs_dump_mem("Received Data is: ", bufs[i],
- HEADER_SIZE(server));
- smb2_add_credits_from_hdr(bufs[i], server);
-#ifdef CONFIG_CIFS_DEBUG2
- if (server->ops->dump_detail)
- server->ops->dump_detail(bufs[i],
- server);
- cifs_dump_mids(server);
-#endif /* CIFS_DEBUG2 */
- }
- }
-
- if (pdu_length > server->pdu_size) {
- if (!allocate_buffers(server))
- continue;
- pdu_length -= server->pdu_size;
- server->total_read = 0;
- server->large_buf = false;
- buf = server->smallbuf;
- goto next_pdu;
- }
- } /* end while !EXITING */
-
- /* buffer usually freed in free_mid - need to free it here on exit */
- cifs_buf_release(server->bigbuf);
- if (server->smallbuf) /* no sense logging a debug message if NULL */
- cifs_small_buf_release(server->smallbuf);
-
- task_to_wake = xchg(&server->tsk, NULL);
- clean_demultiplex_info(server);
-
- /* if server->tsk was NULL then wait for a signal before exiting */
- if (!task_to_wake) {
- set_current_state(TASK_INTERRUPTIBLE);
- while (!signal_pending(current)) {
- schedule();
- set_current_state(TASK_INTERRUPTIBLE);
- }
- set_current_state(TASK_RUNNING);
- }
-
- memalloc_noreclaim_restore(noreclaim_flag);
- module_put_and_kthread_exit(0);
-}
-
-/*
- * Returns true if srcaddr isn't specified and rhs isn't specified, or
- * if srcaddr is specified and matches the IP address of the rhs argument
- */
-bool
-cifs_match_ipaddr(struct sockaddr *srcaddr, struct sockaddr *rhs)
-{
- switch (srcaddr->sa_family) {
- case AF_UNSPEC:
- return (rhs->sa_family == AF_UNSPEC);
- case AF_INET: {
- struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
- struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
- return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
- }
- case AF_INET6: {
- struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
- struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
- return (ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr)
- && saddr6->sin6_scope_id == vaddr6->sin6_scope_id);
- }
- default:
- WARN_ON(1);
- return false; /* don't expect to be here */
- }
-}
-
-/*
- * If no port is specified in addr structure, we try to match with 445 port
- * and if it fails - with 139 ports. It should be called only if address
- * families of server and addr are equal.
- */
-static bool
-match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
-{
- __be16 port, *sport;
-
- /* SMBDirect manages its own ports, don't match it here */
- if (server->rdma)
- return true;
-
- switch (addr->sa_family) {
- case AF_INET:
- sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
- port = ((struct sockaddr_in *) addr)->sin_port;
- break;
- case AF_INET6:
- sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
- port = ((struct sockaddr_in6 *) addr)->sin6_port;
- break;
- default:
- WARN_ON(1);
- return false;
- }
-
- if (!port) {
- port = htons(CIFS_PORT);
- if (port == *sport)
- return true;
-
- port = htons(RFC1001_PORT);
- }
-
- return port == *sport;
-}
-
-static bool match_server_address(struct TCP_Server_Info *server, struct sockaddr *addr)
-{
- if (!cifs_match_ipaddr(addr, (struct sockaddr *)&server->dstaddr))
- return false;
-
- return true;
-}
-
-static bool
-match_security(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
-{
- /*
- * The select_sectype function should either return the ctx->sectype
- * that was specified, or "Unspecified" if that sectype was not
- * compatible with the given NEGOTIATE request.
- */
- if (server->ops->select_sectype(server, ctx->sectype)
- == Unspecified)
- return false;
-
- /*
- * Now check if signing mode is acceptable. No need to check
- * global_secflags at this point since if MUST_SIGN is set then
- * the server->sign had better be too.
- */
- if (ctx->sign && !server->sign)
- return false;
-
- return true;
-}
-
-/* this function must be called with srv_lock held */
-static int match_server(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
-{
- struct sockaddr *addr = (struct sockaddr *)&ctx->dstaddr;
-
- lockdep_assert_held(&server->srv_lock);
-
- if (ctx->nosharesock)
- return 0;
-
- /* this server does not share socket */
- if (server->nosharesock)
- return 0;
-
- /* If multidialect negotiation see if existing sessions match one */
- if (strcmp(ctx->vals->version_string, SMB3ANY_VERSION_STRING) == 0) {
- if (server->vals->protocol_id < SMB30_PROT_ID)
- return 0;
- } else if (strcmp(ctx->vals->version_string,
- SMBDEFAULT_VERSION_STRING) == 0) {
- if (server->vals->protocol_id < SMB21_PROT_ID)
- return 0;
- } else if ((server->vals != ctx->vals) || (server->ops != ctx->ops))
- return 0;
-
- if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
- return 0;
-
- if (!cifs_match_ipaddr((struct sockaddr *)&ctx->srcaddr,
- (struct sockaddr *)&server->srcaddr))
- return 0;
- /*
- * - Match for an DFS tcon (@server->origin_fullpath).
- * - Match for an DFS root server connection (@server->leaf_fullpath).
- * - If none of the above and @ctx->leaf_fullpath is set, then
- * it is a new DFS connection.
- * - If 'nodfs' mount option was passed, then match only connections
- * that have no DFS referrals set
- * (e.g. can't failover to other targets).
- */
- if (!ctx->nodfs) {
- if (ctx->source && server->origin_fullpath) {
- if (!dfs_src_pathname_equal(ctx->source,
- server->origin_fullpath))
- return 0;
- } else if (server->leaf_fullpath) {
- if (!ctx->leaf_fullpath ||
- strcasecmp(server->leaf_fullpath,
- ctx->leaf_fullpath))
- return 0;
- } else if (ctx->leaf_fullpath) {
- return 0;
- }
- } else if (server->origin_fullpath || server->leaf_fullpath) {
- return 0;
- }
-
- /*
- * Match for a regular connection (address/hostname/port) which has no
- * DFS referrals set.
- */
- if (!server->origin_fullpath && !server->leaf_fullpath &&
- (strcasecmp(server->hostname, ctx->server_hostname) ||
- !match_server_address(server, addr) ||
- !match_port(server, addr)))
- return 0;
-
- if (!match_security(server, ctx))
- return 0;
-
- if (server->echo_interval != ctx->echo_interval * HZ)
- return 0;
-
- if (server->rdma != ctx->rdma)
- return 0;
-
- if (server->ignore_signature != ctx->ignore_signature)
- return 0;
-
- if (server->min_offload != ctx->min_offload)
- return 0;
-
- return 1;
-}
-
-struct TCP_Server_Info *
-cifs_find_tcp_session(struct smb3_fs_context *ctx)
-{
- struct TCP_Server_Info *server;
-
- spin_lock(&cifs_tcp_ses_lock);
- list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
- spin_lock(&server->srv_lock);
- /*
- * Skip ses channels since they're only handled in lower layers
- * (e.g. cifs_send_recv).
- */
- if (CIFS_SERVER_IS_CHAN(server) || !match_server(server, ctx)) {
- spin_unlock(&server->srv_lock);
- continue;
- }
- spin_unlock(&server->srv_lock);
-
- ++server->srv_count;
- spin_unlock(&cifs_tcp_ses_lock);
- cifs_dbg(FYI, "Existing tcp session with server found\n");
- return server;
- }
- spin_unlock(&cifs_tcp_ses_lock);
- return NULL;
-}
-
-void
-cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
-{
- struct task_struct *task;
-
- spin_lock(&cifs_tcp_ses_lock);
- if (--server->srv_count > 0) {
- spin_unlock(&cifs_tcp_ses_lock);
- return;
- }
-
- /* srv_count can never go negative */
- WARN_ON(server->srv_count < 0);
-
- put_net(cifs_net_ns(server));
-
- list_del_init(&server->tcp_ses_list);
- spin_unlock(&cifs_tcp_ses_lock);
-
- /* For secondary channels, we pick up ref-count on the primary server */
- if (CIFS_SERVER_IS_CHAN(server))
- cifs_put_tcp_session(server->primary_server, from_reconnect);
-
- cancel_delayed_work_sync(&server->echo);
-
- if (from_reconnect)
- /*
- * Avoid deadlock here: reconnect work calls
- * cifs_put_tcp_session() at its end. Need to be sure
- * that reconnect work does nothing with server pointer after
- * that step.
- */
- cancel_delayed_work(&server->reconnect);
- else
- cancel_delayed_work_sync(&server->reconnect);
-
- spin_lock(&server->srv_lock);
- server->tcpStatus = CifsExiting;
- spin_unlock(&server->srv_lock);
-
- cifs_crypto_secmech_release(server);
-
- kfree_sensitive(server->session_key.response);
- server->session_key.response = NULL;
- server->session_key.len = 0;
- kfree(server->hostname);
- server->hostname = NULL;
-
- task = xchg(&server->tsk, NULL);
- if (task)
- send_sig(SIGKILL, task, 1);
-}
-
-struct TCP_Server_Info *
-cifs_get_tcp_session(struct smb3_fs_context *ctx,
- struct TCP_Server_Info *primary_server)
-{
- struct TCP_Server_Info *tcp_ses = NULL;
- int rc;
-
- cifs_dbg(FYI, "UNC: %s\n", ctx->UNC);
-
- /* see if we already have a matching tcp_ses */
- tcp_ses = cifs_find_tcp_session(ctx);
- if (tcp_ses)
- return tcp_ses;
-
- tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
- if (!tcp_ses) {
- rc = -ENOMEM;
- goto out_err;
- }
-
- tcp_ses->hostname = kstrdup(ctx->server_hostname, GFP_KERNEL);
- if (!tcp_ses->hostname) {
- rc = -ENOMEM;
- goto out_err;
- }
-
- if (ctx->leaf_fullpath) {
- tcp_ses->leaf_fullpath = kstrdup(ctx->leaf_fullpath, GFP_KERNEL);
- if (!tcp_ses->leaf_fullpath) {
- rc = -ENOMEM;
- goto out_err;
- }
- }
-
- if (ctx->nosharesock)
- tcp_ses->nosharesock = true;
-
- tcp_ses->ops = ctx->ops;
- tcp_ses->vals = ctx->vals;
- cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
-
- tcp_ses->conn_id = atomic_inc_return(&tcpSesNextId);
- tcp_ses->noblockcnt = ctx->rootfs;
- tcp_ses->noblocksnd = ctx->noblocksnd || ctx->rootfs;
- tcp_ses->noautotune = ctx->noautotune;
- tcp_ses->tcp_nodelay = ctx->sockopt_tcp_nodelay;
- tcp_ses->rdma = ctx->rdma;
- tcp_ses->in_flight = 0;
- tcp_ses->max_in_flight = 0;
- tcp_ses->credits = 1;
- if (primary_server) {
- spin_lock(&cifs_tcp_ses_lock);
- ++primary_server->srv_count;
- spin_unlock(&cifs_tcp_ses_lock);
- tcp_ses->primary_server = primary_server;
- }
- init_waitqueue_head(&tcp_ses->response_q);
- init_waitqueue_head(&tcp_ses->request_q);
- INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
- mutex_init(&tcp_ses->_srv_mutex);
- memcpy(tcp_ses->workstation_RFC1001_name,
- ctx->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
- memcpy(tcp_ses->server_RFC1001_name,
- ctx->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
- tcp_ses->session_estab = false;
- tcp_ses->sequence_number = 0;
- tcp_ses->reconnect_instance = 1;
- tcp_ses->lstrp = jiffies;
- tcp_ses->compress_algorithm = cpu_to_le16(ctx->compression);
- spin_lock_init(&tcp_ses->req_lock);
- spin_lock_init(&tcp_ses->srv_lock);
- spin_lock_init(&tcp_ses->mid_lock);
- INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
- INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
- INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
- INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server);
- mutex_init(&tcp_ses->reconnect_mutex);
-#ifdef CONFIG_CIFS_DFS_UPCALL
- mutex_init(&tcp_ses->refpath_lock);
-#endif
- memcpy(&tcp_ses->srcaddr, &ctx->srcaddr,
- sizeof(tcp_ses->srcaddr));
- memcpy(&tcp_ses->dstaddr, &ctx->dstaddr,
- sizeof(tcp_ses->dstaddr));
- if (ctx->use_client_guid)
- memcpy(tcp_ses->client_guid, ctx->client_guid,
- SMB2_CLIENT_GUID_SIZE);
- else
- generate_random_uuid(tcp_ses->client_guid);
- /*
- * at this point we are the only ones with the pointer
- * to the struct since the kernel thread not created yet
- * no need to spinlock this init of tcpStatus or srv_count
- */
- tcp_ses->tcpStatus = CifsNew;
- ++tcp_ses->srv_count;
-
- if (ctx->echo_interval >= SMB_ECHO_INTERVAL_MIN &&
- ctx->echo_interval <= SMB_ECHO_INTERVAL_MAX)
- tcp_ses->echo_interval = ctx->echo_interval * HZ;
- else
- tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ;
- if (tcp_ses->rdma) {
-#ifndef CONFIG_CIFS_SMB_DIRECT
- cifs_dbg(VFS, "CONFIG_CIFS_SMB_DIRECT is not enabled\n");
- rc = -ENOENT;
- goto out_err_crypto_release;
-#endif
- tcp_ses->smbd_conn = smbd_get_connection(
- tcp_ses, (struct sockaddr *)&ctx->dstaddr);
- if (tcp_ses->smbd_conn) {
- cifs_dbg(VFS, "RDMA transport established\n");
- rc = 0;
- goto smbd_connected;
- } else {
- rc = -ENOENT;
- goto out_err_crypto_release;
- }
- }
- rc = ip_connect(tcp_ses);
- if (rc < 0) {
- cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
- goto out_err_crypto_release;
- }
-smbd_connected:
- /*
- * since we're in a cifs function already, we know that
- * this will succeed. No need for try_module_get().
- */
- __module_get(THIS_MODULE);
- tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
- tcp_ses, "cifsd");
- if (IS_ERR(tcp_ses->tsk)) {
- rc = PTR_ERR(tcp_ses->tsk);
- cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
- module_put(THIS_MODULE);
- goto out_err_crypto_release;
- }
- tcp_ses->min_offload = ctx->min_offload;
- /*
- * at this point we are the only ones with the pointer
- * to the struct since the kernel thread not created yet
- * no need to spinlock this update of tcpStatus
- */
- spin_lock(&tcp_ses->srv_lock);
- tcp_ses->tcpStatus = CifsNeedNegotiate;
- spin_unlock(&tcp_ses->srv_lock);
-
- if ((ctx->max_credits < 20) || (ctx->max_credits > 60000))
- tcp_ses->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
- else
- tcp_ses->max_credits = ctx->max_credits;
-
- tcp_ses->nr_targets = 1;
- tcp_ses->ignore_signature = ctx->ignore_signature;
- /* thread spawned, put it on the list */
- spin_lock(&cifs_tcp_ses_lock);
- list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
- spin_unlock(&cifs_tcp_ses_lock);
-
- /* queue echo request delayed work */
- queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
-
- return tcp_ses;
-
-out_err_crypto_release:
- cifs_crypto_secmech_release(tcp_ses);
-
- put_net(cifs_net_ns(tcp_ses));
-
-out_err:
- if (tcp_ses) {
- if (CIFS_SERVER_IS_CHAN(tcp_ses))
- cifs_put_tcp_session(tcp_ses->primary_server, false);
- kfree(tcp_ses->hostname);
- kfree(tcp_ses->leaf_fullpath);
- if (tcp_ses->ssocket)
- sock_release(tcp_ses->ssocket);
- kfree(tcp_ses);
- }
- return ERR_PTR(rc);
-}
-
-/* this function must be called with ses_lock and chan_lock held */
-static int match_session(struct cifs_ses *ses, struct smb3_fs_context *ctx)
-{
- if (ctx->sectype != Unspecified &&
- ctx->sectype != ses->sectype)
- return 0;
-
- /*
- * If an existing session is limited to less channels than
- * requested, it should not be reused
- */
- if (ses->chan_max < ctx->max_channels)
- return 0;
-
- switch (ses->sectype) {
- case Kerberos:
- if (!uid_eq(ctx->cred_uid, ses->cred_uid))
- return 0;
- break;
- default:
- /* NULL username means anonymous session */
- if (ses->user_name == NULL) {
- if (!ctx->nullauth)
- return 0;
- break;
- }
-
- /* anything else takes username/password */
- if (strncmp(ses->user_name,
- ctx->username ? ctx->username : "",
- CIFS_MAX_USERNAME_LEN))
- return 0;
- if ((ctx->username && strlen(ctx->username) != 0) &&
- ses->password != NULL &&
- strncmp(ses->password,
- ctx->password ? ctx->password : "",
- CIFS_MAX_PASSWORD_LEN))
- return 0;
- }
- return 1;
-}
-
-/**
- * cifs_setup_ipc - helper to setup the IPC tcon for the session
- * @ses: smb session to issue the request on
- * @ctx: the superblock configuration context to use for building the
- * new tree connection for the IPC (interprocess communication RPC)
- *
- * A new IPC connection is made and stored in the session
- * tcon_ipc. The IPC tcon has the same lifetime as the session.
- */
-static int
-cifs_setup_ipc(struct cifs_ses *ses, struct smb3_fs_context *ctx)
-{
- int rc = 0, xid;
- struct cifs_tcon *tcon;
- char unc[SERVER_NAME_LENGTH + sizeof("//x/IPC$")] = {0};
- bool seal = false;
- struct TCP_Server_Info *server = ses->server;
-
- /*
- * If the mount request that resulted in the creation of the
- * session requires encryption, force IPC to be encrypted too.
- */
- if (ctx->seal) {
- if (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)
- seal = true;
- else {
- cifs_server_dbg(VFS,
- "IPC: server doesn't support encryption\n");
- return -EOPNOTSUPP;
- }
- }
-
- tcon = tconInfoAlloc();
- if (tcon == NULL)
- return -ENOMEM;
-
- spin_lock(&server->srv_lock);
- scnprintf(unc, sizeof(unc), "\\\\%s\\IPC$", server->hostname);
- spin_unlock(&server->srv_lock);
-
- xid = get_xid();
- tcon->ses = ses;
- tcon->ipc = true;
- tcon->seal = seal;
- rc = server->ops->tree_connect(xid, ses, unc, tcon, ctx->local_nls);
- free_xid(xid);
-
- if (rc) {
- cifs_server_dbg(VFS, "failed to connect to IPC (rc=%d)\n", rc);
- tconInfoFree(tcon);
- goto out;
- }
-
- cifs_dbg(FYI, "IPC tcon rc=%d ipc tid=0x%x\n", rc, tcon->tid);
-
- spin_lock(&tcon->tc_lock);
- tcon->status = TID_GOOD;
- spin_unlock(&tcon->tc_lock);
- ses->tcon_ipc = tcon;
-out:
- return rc;
-}
-
-/**
- * cifs_free_ipc - helper to release the session IPC tcon
- * @ses: smb session to unmount the IPC from
- *
- * Needs to be called everytime a session is destroyed.
- *
- * On session close, the IPC is closed and the server must release all tcons of the session.
- * No need to send a tree disconnect here.
- *
- * Besides, it will make the server to not close durable and resilient files on session close, as
- * specified in MS-SMB2 3.3.5.6 Receiving an SMB2 LOGOFF Request.
- */
-static int
-cifs_free_ipc(struct cifs_ses *ses)
-{
- struct cifs_tcon *tcon = ses->tcon_ipc;
-
- if (tcon == NULL)
- return 0;
-
- tconInfoFree(tcon);
- ses->tcon_ipc = NULL;
- return 0;
-}
-
-static struct cifs_ses *
-cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
-{
- struct cifs_ses *ses, *ret = NULL;
-
- spin_lock(&cifs_tcp_ses_lock);
- list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
- spin_lock(&ses->ses_lock);
- if (ses->ses_status == SES_EXITING) {
- spin_unlock(&ses->ses_lock);
- continue;
- }
- spin_lock(&ses->chan_lock);
- if (match_session(ses, ctx)) {
- spin_unlock(&ses->chan_lock);
- spin_unlock(&ses->ses_lock);
- ret = ses;
- break;
- }
- spin_unlock(&ses->chan_lock);
- spin_unlock(&ses->ses_lock);
- }
- if (ret)
- cifs_smb_ses_inc_refcount(ret);
- spin_unlock(&cifs_tcp_ses_lock);
- return ret;
-}
-
-void __cifs_put_smb_ses(struct cifs_ses *ses)
-{
- unsigned int rc, xid;
- unsigned int chan_count;
- struct TCP_Server_Info *server = ses->server;
-
- spin_lock(&ses->ses_lock);
- if (ses->ses_status == SES_EXITING) {
- spin_unlock(&ses->ses_lock);
- return;
- }
- spin_unlock(&ses->ses_lock);
-
- cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
- cifs_dbg(FYI,
- "%s: ses ipc: %s\n", __func__, ses->tcon_ipc ? ses->tcon_ipc->tree_name : "NONE");
-
- spin_lock(&cifs_tcp_ses_lock);
- if (--ses->ses_count > 0) {
- spin_unlock(&cifs_tcp_ses_lock);
- return;
- }
- spin_unlock(&cifs_tcp_ses_lock);
-
- /* ses_count can never go negative */
- WARN_ON(ses->ses_count < 0);
-
- spin_lock(&ses->ses_lock);
- if (ses->ses_status == SES_GOOD)
- ses->ses_status = SES_EXITING;
-
- if (ses->ses_status == SES_EXITING && server->ops->logoff) {
- spin_unlock(&ses->ses_lock);
- cifs_free_ipc(ses);
- xid = get_xid();
- rc = server->ops->logoff(xid, ses);
- if (rc)
- cifs_server_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
- __func__, rc);
- _free_xid(xid);
- } else {
- spin_unlock(&ses->ses_lock);
- cifs_free_ipc(ses);
- }
-
- spin_lock(&cifs_tcp_ses_lock);
- list_del_init(&ses->smb_ses_list);
- spin_unlock(&cifs_tcp_ses_lock);
-
- chan_count = ses->chan_count;
-
- /* close any extra channels */
- if (chan_count > 1) {
- int i;
-
- for (i = 1; i < chan_count; i++) {
- if (ses->chans[i].iface) {
- kref_put(&ses->chans[i].iface->refcount, release_iface);
- ses->chans[i].iface = NULL;
- }
- cifs_put_tcp_session(ses->chans[i].server, 0);
- ses->chans[i].server = NULL;
- }
- }
-
- sesInfoFree(ses);
- cifs_put_tcp_session(server, 0);
-}
-
-#ifdef CONFIG_KEYS
-
-/* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
-#define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
-
-/* Populate username and pw fields from keyring if possible */
-static int
-cifs_set_cifscreds(struct smb3_fs_context *ctx, struct cifs_ses *ses)
-{
- int rc = 0;
- int is_domain = 0;
- const char *delim, *payload;
- char *desc;
- ssize_t len;
- struct key *key;
- struct TCP_Server_Info *server = ses->server;
- struct sockaddr_in *sa;
- struct sockaddr_in6 *sa6;
- const struct user_key_payload *upayload;
-
- desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
- if (!desc)
- return -ENOMEM;
-
- /* try to find an address key first */
- switch (server->dstaddr.ss_family) {
- case AF_INET:
- sa = (struct sockaddr_in *)&server->dstaddr;
- sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
- break;
- case AF_INET6:
- sa6 = (struct sockaddr_in6 *)&server->dstaddr;
- sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
- break;
- default:
- cifs_dbg(FYI, "Bad ss_family (%hu)\n",
- server->dstaddr.ss_family);
- rc = -EINVAL;
- goto out_err;
- }
-
- cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
- key = request_key(&key_type_logon, desc, "");
- if (IS_ERR(key)) {
- if (!ses->domainName) {
- cifs_dbg(FYI, "domainName is NULL\n");
- rc = PTR_ERR(key);
- goto out_err;
- }
-
- /* didn't work, try to find a domain key */
- sprintf(desc, "cifs:d:%s", ses->domainName);
- cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
- key = request_key(&key_type_logon, desc, "");
- if (IS_ERR(key)) {
- rc = PTR_ERR(key);
- goto out_err;
- }
- is_domain = 1;
- }
-
- down_read(&key->sem);
- upayload = user_key_payload_locked(key);
- if (IS_ERR_OR_NULL(upayload)) {
- rc = upayload ? PTR_ERR(upayload) : -EINVAL;
- goto out_key_put;
- }
-
- /* find first : in payload */
- payload = upayload->data;
- delim = strnchr(payload, upayload->datalen, ':');
- cifs_dbg(FYI, "payload=%s\n", payload);
- if (!delim) {
- cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
- upayload->datalen);
- rc = -EINVAL;
- goto out_key_put;
- }
-
- len = delim - payload;
- if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
- cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
- len);
- rc = -EINVAL;
- goto out_key_put;
- }
-
- ctx->username = kstrndup(payload, len, GFP_KERNEL);
- if (!ctx->username) {
- cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
- len);
- rc = -ENOMEM;
- goto out_key_put;
- }
- cifs_dbg(FYI, "%s: username=%s\n", __func__, ctx->username);
-
- len = key->datalen - (len + 1);
- if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
- cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
- rc = -EINVAL;
- kfree(ctx->username);
- ctx->username = NULL;
- goto out_key_put;
- }
-
- ++delim;
- ctx->password = kstrndup(delim, len, GFP_KERNEL);
- if (!ctx->password) {
- cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
- len);
- rc = -ENOMEM;
- kfree(ctx->username);
- ctx->username = NULL;
- goto out_key_put;
- }
-
- /*
- * If we have a domain key then we must set the domainName in the
- * for the request.
- */
- if (is_domain && ses->domainName) {
- ctx->domainname = kstrdup(ses->domainName, GFP_KERNEL);
- if (!ctx->domainname) {
- cifs_dbg(FYI, "Unable to allocate %zd bytes for domain\n",
- len);
- rc = -ENOMEM;
- kfree(ctx->username);
- ctx->username = NULL;
- kfree_sensitive(ctx->password);
- ctx->password = NULL;
- goto out_key_put;
- }
- }
-
- strscpy(ctx->workstation_name, ses->workstation_name, sizeof(ctx->workstation_name));
-
-out_key_put:
- up_read(&key->sem);
- key_put(key);
-out_err:
- kfree(desc);
- cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
- return rc;
-}
-#else /* ! CONFIG_KEYS */
-static inline int
-cifs_set_cifscreds(struct smb3_fs_context *ctx __attribute__((unused)),
- struct cifs_ses *ses __attribute__((unused)))
-{
- return -ENOSYS;
-}
-#endif /* CONFIG_KEYS */
-
-/**
- * cifs_get_smb_ses - get a session matching @ctx data from @server
- * @server: server to setup the session to
- * @ctx: superblock configuration context to use to setup the session
- *
- * This function assumes it is being called from cifs_mount() where we
- * already got a server reference (server refcount +1). See
- * cifs_get_tcon() for refcount explanations.
- */
-struct cifs_ses *
-cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
-{
- int rc = 0;
- unsigned int xid;
- struct cifs_ses *ses;
- struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
- struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
-
- xid = get_xid();
-
- ses = cifs_find_smb_ses(server, ctx);
- if (ses) {
- cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
- ses->ses_status);
-
- spin_lock(&ses->chan_lock);
- if (cifs_chan_needs_reconnect(ses, server)) {
- spin_unlock(&ses->chan_lock);
- cifs_dbg(FYI, "Session needs reconnect\n");
-
- mutex_lock(&ses->session_mutex);
- rc = cifs_negotiate_protocol(xid, ses, server);
- if (rc) {
- mutex_unlock(&ses->session_mutex);
- /* problem -- put our ses reference */
- cifs_put_smb_ses(ses);
- free_xid(xid);
- return ERR_PTR(rc);
- }
-
- rc = cifs_setup_session(xid, ses, server,
- ctx->local_nls);
- if (rc) {
- mutex_unlock(&ses->session_mutex);
- /* problem -- put our reference */
- cifs_put_smb_ses(ses);
- free_xid(xid);
- return ERR_PTR(rc);
- }
- mutex_unlock(&ses->session_mutex);
-
- spin_lock(&ses->chan_lock);
- }
- spin_unlock(&ses->chan_lock);
-
- /* existing SMB ses has a server reference already */
- cifs_put_tcp_session(server, 0);
- free_xid(xid);
- return ses;
- }
-
- rc = -ENOMEM;
-
- cifs_dbg(FYI, "Existing smb sess not found\n");
- ses = sesInfoAlloc();
- if (ses == NULL)
- goto get_ses_fail;
-
- /* new SMB session uses our server ref */
- ses->server = server;
- if (server->dstaddr.ss_family == AF_INET6)
- sprintf(ses->ip_addr, "%pI6", &addr6->sin6_addr);
- else
- sprintf(ses->ip_addr, "%pI4", &addr->sin_addr);
-
- if (ctx->username) {
- ses->user_name = kstrdup(ctx->username, GFP_KERNEL);
- if (!ses->user_name)
- goto get_ses_fail;
- }
-
- /* ctx->password freed at unmount */
- if (ctx->password) {
- ses->password = kstrdup(ctx->password, GFP_KERNEL);
- if (!ses->password)
- goto get_ses_fail;
- }
- if (ctx->domainname) {
- ses->domainName = kstrdup(ctx->domainname, GFP_KERNEL);
- if (!ses->domainName)
- goto get_ses_fail;
- }
-
- strscpy(ses->workstation_name, ctx->workstation_name, sizeof(ses->workstation_name));
-
- if (ctx->domainauto)
- ses->domainAuto = ctx->domainauto;
- ses->cred_uid = ctx->cred_uid;
- ses->linux_uid = ctx->linux_uid;
-
- ses->sectype = ctx->sectype;
- ses->sign = ctx->sign;
-
- /* add server as first channel */
- spin_lock(&ses->chan_lock);
- ses->chans[0].server = server;
- ses->chan_count = 1;
- ses->chan_max = ctx->multichannel ? ctx->max_channels:1;
- ses->chans_need_reconnect = 1;
- spin_unlock(&ses->chan_lock);
-
- mutex_lock(&ses->session_mutex);
- rc = cifs_negotiate_protocol(xid, ses, server);
- if (!rc)
- rc = cifs_setup_session(xid, ses, server, ctx->local_nls);
- mutex_unlock(&ses->session_mutex);
-
- /* each channel uses a different signing key */
- spin_lock(&ses->chan_lock);
- memcpy(ses->chans[0].signkey, ses->smb3signingkey,
- sizeof(ses->smb3signingkey));
- spin_unlock(&ses->chan_lock);
-
- if (rc)
- goto get_ses_fail;
-
- /*
- * success, put it on the list and add it as first channel
- * note: the session becomes active soon after this. So you'll
- * need to lock before changing something in the session.
- */
- spin_lock(&cifs_tcp_ses_lock);
- ses->dfs_root_ses = ctx->dfs_root_ses;
- if (ses->dfs_root_ses)
- ses->dfs_root_ses->ses_count++;
- list_add(&ses->smb_ses_list, &server->smb_ses_list);
- spin_unlock(&cifs_tcp_ses_lock);
-
- cifs_setup_ipc(ses, ctx);
-
- free_xid(xid);
-
- return ses;
-
-get_ses_fail:
- sesInfoFree(ses);
- free_xid(xid);
- return ERR_PTR(rc);
-}
-
-/* this function must be called with tc_lock held */
-static int match_tcon(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
-{
- struct TCP_Server_Info *server = tcon->ses->server;
-
- if (tcon->status == TID_EXITING)
- return 0;
- /* Skip UNC validation when matching DFS connections or superblocks */
- if (!server->origin_fullpath && !server->leaf_fullpath &&
- strncmp(tcon->tree_name, ctx->UNC, MAX_TREE_SIZE))
- return 0;
- if (tcon->seal != ctx->seal)
- return 0;
- if (tcon->snapshot_time != ctx->snapshot_time)
- return 0;
- if (tcon->handle_timeout != ctx->handle_timeout)
- return 0;
- if (tcon->no_lease != ctx->no_lease)
- return 0;
- if (tcon->nodelete != ctx->nodelete)
- return 0;
- return 1;
-}
-
-static struct cifs_tcon *
-cifs_find_tcon(struct cifs_ses *ses, struct smb3_fs_context *ctx)
-{
- struct cifs_tcon *tcon;
-
- spin_lock(&cifs_tcp_ses_lock);
- list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
- spin_lock(&tcon->tc_lock);
- if (!match_tcon(tcon, ctx)) {
- spin_unlock(&tcon->tc_lock);
- continue;
- }
- ++tcon->tc_count;
- spin_unlock(&tcon->tc_lock);
- spin_unlock(&cifs_tcp_ses_lock);
- return tcon;
- }
- spin_unlock(&cifs_tcp_ses_lock);
- return NULL;
-}
-
-void
-cifs_put_tcon(struct cifs_tcon *tcon)
-{
- unsigned int xid;
- struct cifs_ses *ses;
-
- /*
- * IPC tcon share the lifetime of their session and are
- * destroyed in the session put function
- */
- if (tcon == NULL || tcon->ipc)
- return;
-
- ses = tcon->ses;
- cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
- spin_lock(&cifs_tcp_ses_lock);
- spin_lock(&tcon->tc_lock);
- if (--tcon->tc_count > 0) {
- spin_unlock(&tcon->tc_lock);
- spin_unlock(&cifs_tcp_ses_lock);
- return;
- }
-
- /* tc_count can never go negative */
- WARN_ON(tcon->tc_count < 0);
-
- list_del_init(&tcon->tcon_list);
- tcon->status = TID_EXITING;
- spin_unlock(&tcon->tc_lock);
- spin_unlock(&cifs_tcp_ses_lock);
-
- /* cancel polling of interfaces */
- cancel_delayed_work_sync(&tcon->query_interfaces);
-#ifdef CONFIG_CIFS_DFS_UPCALL
- cancel_delayed_work_sync(&tcon->dfs_cache_work);
-#endif
-
- if (tcon->use_witness) {
- int rc;
-
- rc = cifs_swn_unregister(tcon);
- if (rc < 0) {
- cifs_dbg(VFS, "%s: Failed to unregister for witness notifications: %d\n",
- __func__, rc);
- }
- }
-
- xid = get_xid();
- if (ses->server->ops->tree_disconnect)
- ses->server->ops->tree_disconnect(xid, tcon);
- _free_xid(xid);
-
- cifs_fscache_release_super_cookie(tcon);
- tconInfoFree(tcon);
- cifs_put_smb_ses(ses);
-}
-
-/**
- * cifs_get_tcon - get a tcon matching @ctx data from @ses
- * @ses: smb session to issue the request on
- * @ctx: the superblock configuration context to use for building the
- *
- * - tcon refcount is the number of mount points using the tcon.
- * - ses refcount is the number of tcon using the session.
- *
- * 1. This function assumes it is being called from cifs_mount() where
- * we already got a session reference (ses refcount +1).
- *
- * 2. Since we're in the context of adding a mount point, the end
- * result should be either:
- *
- * a) a new tcon already allocated with refcount=1 (1 mount point) and
- * its session refcount incremented (1 new tcon). This +1 was
- * already done in (1).
- *
- * b) an existing tcon with refcount+1 (add a mount point to it) and
- * identical ses refcount (no new tcon). Because of (1) we need to
- * decrement the ses refcount.
- */
-static struct cifs_tcon *
-cifs_get_tcon(struct cifs_ses *ses, struct smb3_fs_context *ctx)
-{
- int rc, xid;
- struct cifs_tcon *tcon;
-
- tcon = cifs_find_tcon(ses, ctx);
- if (tcon) {
- /*
- * tcon has refcount already incremented but we need to
- * decrement extra ses reference gotten by caller (case b)
- */
- cifs_dbg(FYI, "Found match on UNC path\n");
- cifs_put_smb_ses(ses);
- return tcon;
- }
-
- if (!ses->server->ops->tree_connect) {
- rc = -ENOSYS;
- goto out_fail;
- }
-
- tcon = tconInfoAlloc();
- if (tcon == NULL) {
- rc = -ENOMEM;
- goto out_fail;
- }
-
- if (ctx->snapshot_time) {
- if (ses->server->vals->protocol_id == 0) {
- cifs_dbg(VFS,
- "Use SMB2 or later for snapshot mount option\n");
- rc = -EOPNOTSUPP;
- goto out_fail;
- } else
- tcon->snapshot_time = ctx->snapshot_time;
- }
-
- if (ctx->handle_timeout) {
- if (ses->server->vals->protocol_id == 0) {
- cifs_dbg(VFS,
- "Use SMB2.1 or later for handle timeout option\n");
- rc = -EOPNOTSUPP;
- goto out_fail;
- } else
- tcon->handle_timeout = ctx->handle_timeout;
- }
-
- tcon->ses = ses;
- if (ctx->password) {
- tcon->password = kstrdup(ctx->password, GFP_KERNEL);
- if (!tcon->password) {
- rc = -ENOMEM;
- goto out_fail;
- }
- }
-
- if (ctx->seal) {
- if (ses->server->vals->protocol_id == 0) {
- cifs_dbg(VFS,
- "SMB3 or later required for encryption\n");
- rc = -EOPNOTSUPP;
- goto out_fail;
- } else if (tcon->ses->server->capabilities &
- SMB2_GLOBAL_CAP_ENCRYPTION)
- tcon->seal = true;
- else {
- cifs_dbg(VFS, "Encryption is not supported on share\n");
- rc = -EOPNOTSUPP;
- goto out_fail;
- }
- }
-
- if (ctx->linux_ext) {
- if (ses->server->posix_ext_supported) {
- tcon->posix_extensions = true;
- pr_warn_once("SMB3.11 POSIX Extensions are experimental\n");
- } else if ((ses->server->vals->protocol_id == SMB311_PROT_ID) ||
- (strcmp(ses->server->vals->version_string,
- SMB3ANY_VERSION_STRING) == 0) ||
- (strcmp(ses->server->vals->version_string,
- SMBDEFAULT_VERSION_STRING) == 0)) {
- cifs_dbg(VFS, "Server does not support mounting with posix SMB3.11 extensions\n");
- rc = -EOPNOTSUPP;
- goto out_fail;
- } else {
- cifs_dbg(VFS, "Check vers= mount option. SMB3.11 "
- "disabled but required for POSIX extensions\n");
- rc = -EOPNOTSUPP;
- goto out_fail;
- }
- }
-
- xid = get_xid();
- rc = ses->server->ops->tree_connect(xid, ses, ctx->UNC, tcon,
- ctx->local_nls);
- free_xid(xid);
- cifs_dbg(FYI, "Tcon rc = %d\n", rc);
- if (rc)
- goto out_fail;
-
- tcon->use_persistent = false;
- /* check if SMB2 or later, CIFS does not support persistent handles */
- if (ctx->persistent) {
- if (ses->server->vals->protocol_id == 0) {
- cifs_dbg(VFS,
- "SMB3 or later required for persistent handles\n");
- rc = -EOPNOTSUPP;
- goto out_fail;
- } else if (ses->server->capabilities &
- SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
- tcon->use_persistent = true;
- else /* persistent handles requested but not supported */ {
- cifs_dbg(VFS,
- "Persistent handles not supported on share\n");
- rc = -EOPNOTSUPP;
- goto out_fail;
- }
- } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
- && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
- && (ctx->nopersistent == false)) {
- cifs_dbg(FYI, "enabling persistent handles\n");
- tcon->use_persistent = true;
- } else if (ctx->resilient) {
- if (ses->server->vals->protocol_id == 0) {
- cifs_dbg(VFS,
- "SMB2.1 or later required for resilient handles\n");
- rc = -EOPNOTSUPP;
- goto out_fail;
- }
- tcon->use_resilient = true;
- }
-
- tcon->use_witness = false;
- if (IS_ENABLED(CONFIG_CIFS_SWN_UPCALL) && ctx->witness) {
- if (ses->server->vals->protocol_id >= SMB30_PROT_ID) {
- if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER) {
- /*
- * Set witness in use flag in first place
- * to retry registration in the echo task
- */
- tcon->use_witness = true;
- /* And try to register immediately */
- rc = cifs_swn_register(tcon);
- if (rc < 0) {
- cifs_dbg(VFS, "Failed to register for witness notifications: %d\n", rc);
- goto out_fail;
- }
- } else {
- /* TODO: try to extend for non-cluster uses (eg multichannel) */
- cifs_dbg(VFS, "witness requested on mount but no CLUSTER capability on share\n");
- rc = -EOPNOTSUPP;
- goto out_fail;
- }
- } else {
- cifs_dbg(VFS, "SMB3 or later required for witness option\n");
- rc = -EOPNOTSUPP;
- goto out_fail;
- }
- }
-
- /* If the user really knows what they are doing they can override */
- if (tcon->share_flags & SMB2_SHAREFLAG_NO_CACHING) {
- if (ctx->cache_ro)
- cifs_dbg(VFS, "cache=ro requested on mount but NO_CACHING flag set on share\n");
- else if (ctx->cache_rw)
- cifs_dbg(VFS, "cache=singleclient requested on mount but NO_CACHING flag set on share\n");
- }
-
- if (ctx->no_lease) {
- if (ses->server->vals->protocol_id == 0) {
- cifs_dbg(VFS,
- "SMB2 or later required for nolease option\n");
- rc = -EOPNOTSUPP;
- goto out_fail;
- } else
- tcon->no_lease = ctx->no_lease;
- }
-
- /*
- * We can have only one retry value for a connection to a share so for
- * resources mounted more than once to the same server share the last
- * value passed in for the retry flag is used.
- */
- tcon->retry = ctx->retry;
- tcon->nocase = ctx->nocase;
- tcon->broken_sparse_sup = ctx->no_sparse;
- if (ses->server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING)
- tcon->nohandlecache = ctx->nohandlecache;
- else
- tcon->nohandlecache = true;
- tcon->nodelete = ctx->nodelete;
- tcon->local_lease = ctx->local_lease;
- INIT_LIST_HEAD(&tcon->pending_opens);
- tcon->status = TID_GOOD;
-
- INIT_DELAYED_WORK(&tcon->query_interfaces,
- smb2_query_server_interfaces);
- if (ses->server->dialect >= SMB30_PROT_ID &&
- (ses->server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
- /* schedule query interfaces poll */
- queue_delayed_work(cifsiod_wq, &tcon->query_interfaces,
- (SMB_INTERFACE_POLL_INTERVAL * HZ));
- }
-#ifdef CONFIG_CIFS_DFS_UPCALL
- INIT_DELAYED_WORK(&tcon->dfs_cache_work, dfs_cache_refresh);
-#endif
- spin_lock(&cifs_tcp_ses_lock);
- list_add(&tcon->tcon_list, &ses->tcon_list);
- spin_unlock(&cifs_tcp_ses_lock);
-
- return tcon;
-
-out_fail:
- tconInfoFree(tcon);
- return ERR_PTR(rc);
-}
-
-void
-cifs_put_tlink(struct tcon_link *tlink)
-{
- if (!tlink || IS_ERR(tlink))
- return;
-
- if (!atomic_dec_and_test(&tlink->tl_count) ||
- test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
- tlink->tl_time = jiffies;
- return;
- }
-
- if (!IS_ERR(tlink_tcon(tlink)))
- cifs_put_tcon(tlink_tcon(tlink));
- kfree(tlink);
- return;
-}
-
-static int
-compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
-{
- struct cifs_sb_info *old = CIFS_SB(sb);
- struct cifs_sb_info *new = mnt_data->cifs_sb;
- unsigned int oldflags = old->mnt_cifs_flags & CIFS_MOUNT_MASK;
- unsigned int newflags = new->mnt_cifs_flags & CIFS_MOUNT_MASK;
-
- if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
- return 0;
-
- if (old->mnt_cifs_serverino_autodisabled)
- newflags &= ~CIFS_MOUNT_SERVER_INUM;
-
- if (oldflags != newflags)
- return 0;
-
- /*
- * We want to share sb only if we don't specify an r/wsize or
- * specified r/wsize is greater than or equal to existing one.
- */
- if (new->ctx->wsize && new->ctx->wsize < old->ctx->wsize)
- return 0;
-
- if (new->ctx->rsize && new->ctx->rsize < old->ctx->rsize)
- return 0;
-
- if (!uid_eq(old->ctx->linux_uid, new->ctx->linux_uid) ||
- !gid_eq(old->ctx->linux_gid, new->ctx->linux_gid))
- return 0;
-
- if (old->ctx->file_mode != new->ctx->file_mode ||
- old->ctx->dir_mode != new->ctx->dir_mode)
- return 0;
-
- if (strcmp(old->local_nls->charset, new->local_nls->charset))
- return 0;
-
- if (old->ctx->acregmax != new->ctx->acregmax)
- return 0;
- if (old->ctx->acdirmax != new->ctx->acdirmax)
- return 0;
- if (old->ctx->closetimeo != new->ctx->closetimeo)
- return 0;
-
- return 1;
-}
-
-static int match_prepath(struct super_block *sb,
- struct TCP_Server_Info *server,
- struct cifs_mnt_data *mnt_data)
-{
- struct smb3_fs_context *ctx = mnt_data->ctx;
- struct cifs_sb_info *old = CIFS_SB(sb);
- struct cifs_sb_info *new = mnt_data->cifs_sb;
- bool old_set = (old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) &&
- old->prepath;
- bool new_set = (new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) &&
- new->prepath;
-
- if (server->origin_fullpath &&
- dfs_src_pathname_equal(server->origin_fullpath, ctx->source))
- return 1;
-
- if (old_set && new_set && !strcmp(new->prepath, old->prepath))
- return 1;
- else if (!old_set && !new_set)
- return 1;
-
- return 0;
-}
-
-int
-cifs_match_super(struct super_block *sb, void *data)
-{
- struct cifs_mnt_data *mnt_data = data;
- struct smb3_fs_context *ctx;
- struct cifs_sb_info *cifs_sb;
- struct TCP_Server_Info *tcp_srv;
- struct cifs_ses *ses;
- struct cifs_tcon *tcon;
- struct tcon_link *tlink;
- int rc = 0;
-
- spin_lock(&cifs_tcp_ses_lock);
- cifs_sb = CIFS_SB(sb);
-
- /* We do not want to use a superblock that has been shutdown */
- if (CIFS_MOUNT_SHUTDOWN & cifs_sb->mnt_cifs_flags) {
- spin_unlock(&cifs_tcp_ses_lock);
- return 0;
- }
-
- tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
- if (tlink == NULL) {
- /* can not match superblock if tlink were ever null */
- spin_unlock(&cifs_tcp_ses_lock);
- return 0;
- }
- tcon = tlink_tcon(tlink);
- ses = tcon->ses;
- tcp_srv = ses->server;
-
- ctx = mnt_data->ctx;
-
- spin_lock(&tcp_srv->srv_lock);
- spin_lock(&ses->ses_lock);
- spin_lock(&ses->chan_lock);
- spin_lock(&tcon->tc_lock);
- if (!match_server(tcp_srv, ctx) ||
- !match_session(ses, ctx) ||
- !match_tcon(tcon, ctx) ||
- !match_prepath(sb, tcp_srv, mnt_data)) {
- rc = 0;
- goto out;
- }
-
- rc = compare_mount_options(sb, mnt_data);
-out:
- spin_unlock(&tcon->tc_lock);
- spin_unlock(&ses->chan_lock);
- spin_unlock(&ses->ses_lock);
- spin_unlock(&tcp_srv->srv_lock);
-
- spin_unlock(&cifs_tcp_ses_lock);
- cifs_put_tlink(tlink);
- return rc;
-}
-
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
-static struct lock_class_key cifs_key[2];
-static struct lock_class_key cifs_slock_key[2];
-
-static inline void
-cifs_reclassify_socket4(struct socket *sock)
-{
- struct sock *sk = sock->sk;
- BUG_ON(!sock_allow_reclassification(sk));
- sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
- &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
-}
-
-static inline void
-cifs_reclassify_socket6(struct socket *sock)
-{
- struct sock *sk = sock->sk;
- BUG_ON(!sock_allow_reclassification(sk));
- sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
- &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
-}
-#else
-static inline void
-cifs_reclassify_socket4(struct socket *sock)
-{
-}
-
-static inline void
-cifs_reclassify_socket6(struct socket *sock)
-{
-}
-#endif
-
-/* See RFC1001 section 14 on representation of Netbios names */
-static void rfc1002mangle(char *target, char *source, unsigned int length)
-{
- unsigned int i, j;
-
- for (i = 0, j = 0; i < (length); i++) {
- /* mask a nibble at a time and encode */
- target[j] = 'A' + (0x0F & (source[i] >> 4));
- target[j+1] = 'A' + (0x0F & source[i]);
- j += 2;
- }
-
-}
-
-static int
-bind_socket(struct TCP_Server_Info *server)
-{
- int rc = 0;
- if (server->srcaddr.ss_family != AF_UNSPEC) {
- /* Bind to the specified local IP address */
- struct socket *socket = server->ssocket;
- rc = socket->ops->bind(socket,
- (struct sockaddr *) &server->srcaddr,
- sizeof(server->srcaddr));
- if (rc < 0) {
- struct sockaddr_in *saddr4;
- struct sockaddr_in6 *saddr6;
- saddr4 = (struct sockaddr_in *)&server->srcaddr;
- saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
- if (saddr6->sin6_family == AF_INET6)
- cifs_server_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
- &saddr6->sin6_addr, rc);
- else
- cifs_server_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
- &saddr4->sin_addr.s_addr, rc);
- }
- }
- return rc;
-}
-
-static int
-ip_rfc1001_connect(struct TCP_Server_Info *server)
-{
- int rc = 0;
- /*
- * some servers require RFC1001 sessinit before sending
- * negprot - BB check reconnection in case where second
- * sessinit is sent but no second negprot
- */
- struct rfc1002_session_packet req = {};
- struct smb_hdr *smb_buf = (struct smb_hdr *)&req;
- unsigned int len;
-
- req.trailer.session_req.called_len = sizeof(req.trailer.session_req.called_name);
-
- if (server->server_RFC1001_name[0] != 0)
- rfc1002mangle(req.trailer.session_req.called_name,
- server->server_RFC1001_name,
- RFC1001_NAME_LEN_WITH_NULL);
- else
- rfc1002mangle(req.trailer.session_req.called_name,
- DEFAULT_CIFS_CALLED_NAME,
- RFC1001_NAME_LEN_WITH_NULL);
-
- req.trailer.session_req.calling_len = sizeof(req.trailer.session_req.calling_name);
-
- /* calling name ends in null (byte 16) from old smb convention */
- if (server->workstation_RFC1001_name[0] != 0)
- rfc1002mangle(req.trailer.session_req.calling_name,
- server->workstation_RFC1001_name,
- RFC1001_NAME_LEN_WITH_NULL);
- else
- rfc1002mangle(req.trailer.session_req.calling_name,
- "LINUX_CIFS_CLNT",
- RFC1001_NAME_LEN_WITH_NULL);
-
- /*
- * As per rfc1002, @len must be the number of bytes that follows the
- * length field of a rfc1002 session request payload.
- */
- len = sizeof(req) - offsetof(struct rfc1002_session_packet, trailer.session_req);
-
- smb_buf->smb_buf_length = cpu_to_be32((RFC1002_SESSION_REQUEST << 24) | len);
- rc = smb_send(server, smb_buf, len);
- /*
- * RFC1001 layer in at least one server requires very short break before
- * negprot presumably because not expecting negprot to follow so fast.
- * This is a simple solution that works without complicating the code
- * and causes no significant slowing down on mount for everyone else
- */
- usleep_range(1000, 2000);
-
- return rc;
-}
-
-static int
-generic_ip_connect(struct TCP_Server_Info *server)
-{
- int rc = 0;
- __be16 sport;
- int slen, sfamily;
- struct socket *socket = server->ssocket;
- struct sockaddr *saddr;
-
- saddr = (struct sockaddr *) &server->dstaddr;
-
- if (server->dstaddr.ss_family == AF_INET6) {
- struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&server->dstaddr;
-
- sport = ipv6->sin6_port;
- slen = sizeof(struct sockaddr_in6);
- sfamily = AF_INET6;
- cifs_dbg(FYI, "%s: connecting to [%pI6]:%d\n", __func__, &ipv6->sin6_addr,
- ntohs(sport));
- } else {
- struct sockaddr_in *ipv4 = (struct sockaddr_in *)&server->dstaddr;
-
- sport = ipv4->sin_port;
- slen = sizeof(struct sockaddr_in);
- sfamily = AF_INET;
- cifs_dbg(FYI, "%s: connecting to %pI4:%d\n", __func__, &ipv4->sin_addr,
- ntohs(sport));
- }
-
- if (socket == NULL) {
- rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
- IPPROTO_TCP, &socket, 1);
- if (rc < 0) {
- cifs_server_dbg(VFS, "Error %d creating socket\n", rc);
- server->ssocket = NULL;
- return rc;
- }
-
- /* BB other socket options to set KEEPALIVE, NODELAY? */
- cifs_dbg(FYI, "Socket created\n");
- server->ssocket = socket;
- socket->sk->sk_allocation = GFP_NOFS;
- socket->sk->sk_use_task_frag = false;
- if (sfamily == AF_INET6)
- cifs_reclassify_socket6(socket);
- else
- cifs_reclassify_socket4(socket);
- }
-
- rc = bind_socket(server);
- if (rc < 0)
- return rc;
-
- /*
- * Eventually check for other socket options to change from
- * the default. sock_setsockopt not used because it expects
- * user space buffer
- */
- socket->sk->sk_rcvtimeo = 7 * HZ;
- socket->sk->sk_sndtimeo = 5 * HZ;
-
- /* make the bufsizes depend on wsize/rsize and max requests */
- if (server->noautotune) {
- if (socket->sk->sk_sndbuf < (200 * 1024))
- socket->sk->sk_sndbuf = 200 * 1024;
- if (socket->sk->sk_rcvbuf < (140 * 1024))
- socket->sk->sk_rcvbuf = 140 * 1024;
- }
-
- if (server->tcp_nodelay)
- tcp_sock_set_nodelay(socket->sk);
-
- cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
- socket->sk->sk_sndbuf,
- socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
-
- rc = socket->ops->connect(socket, saddr, slen,
- server->noblockcnt ? O_NONBLOCK : 0);
- /*
- * When mounting SMB root file systems, we do not want to block in
- * connect. Otherwise bail out and then let cifs_reconnect() perform
- * reconnect failover - if possible.
- */
- if (server->noblockcnt && rc == -EINPROGRESS)
- rc = 0;
- if (rc < 0) {
- cifs_dbg(FYI, "Error %d connecting to server\n", rc);
- trace_smb3_connect_err(server->hostname, server->conn_id, &server->dstaddr, rc);
- sock_release(socket);
- server->ssocket = NULL;
- return rc;
- }
- trace_smb3_connect_done(server->hostname, server->conn_id, &server->dstaddr);
- if (sport == htons(RFC1001_PORT))
- rc = ip_rfc1001_connect(server);
-
- return rc;
-}
-
-static int
-ip_connect(struct TCP_Server_Info *server)
-{
- __be16 *sport;
- struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
- struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
-
- if (server->dstaddr.ss_family == AF_INET6)
- sport = &addr6->sin6_port;
- else
- sport = &addr->sin_port;
-
- if (*sport == 0) {
- int rc;
-
- /* try with 445 port at first */
- *sport = htons(CIFS_PORT);
-
- rc = generic_ip_connect(server);
- if (rc >= 0)
- return rc;
-
- /* if it failed, try with 139 port */
- *sport = htons(RFC1001_PORT);
- }
-
- return generic_ip_connect(server);
-}
-
-#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
-void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
- struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
-{
- /*
- * If we are reconnecting then should we check to see if
- * any requested capabilities changed locally e.g. via
- * remount but we can not do much about it here
- * if they have (even if we could detect it by the following)
- * Perhaps we could add a backpointer to array of sb from tcon
- * or if we change to make all sb to same share the same
- * sb as NFS - then we only have one backpointer to sb.
- * What if we wanted to mount the server share twice once with
- * and once without posixacls or posix paths?
- */
- __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
-
- if (ctx && ctx->no_linux_ext) {
- tcon->fsUnixInfo.Capability = 0;
- tcon->unix_ext = 0; /* Unix Extensions disabled */
- cifs_dbg(FYI, "Linux protocol extensions disabled\n");
- return;
- } else if (ctx)
- tcon->unix_ext = 1; /* Unix Extensions supported */
-
- if (!tcon->unix_ext) {
- cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
- return;
- }
-
- if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
- __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
- cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
- /*
- * check for reconnect case in which we do not
- * want to change the mount behavior if we can avoid it
- */
- if (ctx == NULL) {
- /*
- * turn off POSIX ACL and PATHNAMES if not set
- * originally at mount time
- */
- if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
- cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
- if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
- if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
- cifs_dbg(VFS, "POSIXPATH support change\n");
- cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
- } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
- cifs_dbg(VFS, "possible reconnect error\n");
- cifs_dbg(VFS, "server disabled POSIX path support\n");
- }
- }
-
- if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
- cifs_dbg(VFS, "per-share encryption not supported yet\n");
-
- cap &= CIFS_UNIX_CAP_MASK;
- if (ctx && ctx->no_psx_acl)
- cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
- else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
- cifs_dbg(FYI, "negotiated posix acl support\n");
- if (cifs_sb)
- cifs_sb->mnt_cifs_flags |=
- CIFS_MOUNT_POSIXACL;
- }
-
- if (ctx && ctx->posix_paths == 0)
- cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
- else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
- cifs_dbg(FYI, "negotiate posix pathnames\n");
- if (cifs_sb)
- cifs_sb->mnt_cifs_flags |=
- CIFS_MOUNT_POSIX_PATHS;
- }
-
- cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
-#ifdef CONFIG_CIFS_DEBUG2
- if (cap & CIFS_UNIX_FCNTL_CAP)
- cifs_dbg(FYI, "FCNTL cap\n");
- if (cap & CIFS_UNIX_EXTATTR_CAP)
- cifs_dbg(FYI, "EXTATTR cap\n");
- if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
- cifs_dbg(FYI, "POSIX path cap\n");
- if (cap & CIFS_UNIX_XATTR_CAP)
- cifs_dbg(FYI, "XATTR cap\n");
- if (cap & CIFS_UNIX_POSIX_ACL_CAP)
- cifs_dbg(FYI, "POSIX ACL cap\n");
- if (cap & CIFS_UNIX_LARGE_READ_CAP)
- cifs_dbg(FYI, "very large read cap\n");
- if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
- cifs_dbg(FYI, "very large write cap\n");
- if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
- cifs_dbg(FYI, "transport encryption cap\n");
- if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
- cifs_dbg(FYI, "mandatory transport encryption cap\n");
-#endif /* CIFS_DEBUG2 */
- if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
- if (ctx == NULL)
- cifs_dbg(FYI, "resetting capabilities failed\n");
- else
- cifs_dbg(VFS, "Negotiating Unix capabilities with the server failed. Consider mounting with the Unix Extensions disabled if problems are found by specifying the nounix mount option.\n");
-
- }
- }
-}
-#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
-
-int cifs_setup_cifs_sb(struct cifs_sb_info *cifs_sb)
-{
- struct smb3_fs_context *ctx = cifs_sb->ctx;
-
- INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
-
- spin_lock_init(&cifs_sb->tlink_tree_lock);
- cifs_sb->tlink_tree = RB_ROOT;
-
- cifs_dbg(FYI, "file mode: %04ho dir mode: %04ho\n",
- ctx->file_mode, ctx->dir_mode);
-
- /* this is needed for ASCII cp to Unicode converts */
- if (ctx->iocharset == NULL) {
- /* load_nls_default cannot return null */
- cifs_sb->local_nls = load_nls_default();
- } else {
- cifs_sb->local_nls = load_nls(ctx->iocharset);
- if (cifs_sb->local_nls == NULL) {
- cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
- ctx->iocharset);
- return -ELIBACC;
- }
- }
- ctx->local_nls = cifs_sb->local_nls;
-
- smb3_update_mnt_flags(cifs_sb);
-
- if (ctx->direct_io)
- cifs_dbg(FYI, "mounting share using direct i/o\n");
- if (ctx->cache_ro) {
- cifs_dbg(VFS, "mounting share with read only caching. Ensure that the share will not be modified while in use.\n");
- cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RO_CACHE;
- } else if (ctx->cache_rw) {
- cifs_dbg(VFS, "mounting share in single client RW caching mode. Ensure that no other systems will be accessing the share.\n");
- cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_RO_CACHE |
- CIFS_MOUNT_RW_CACHE);
- }
-
- if ((ctx->cifs_acl) && (ctx->dynperm))
- cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
-
- if (ctx->prepath) {
- cifs_sb->prepath = kstrdup(ctx->prepath, GFP_KERNEL);
- if (cifs_sb->prepath == NULL)
- return -ENOMEM;
- cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
- }
-
- return 0;
-}
-
-/* Release all succeed connections */
-void cifs_mount_put_conns(struct cifs_mount_ctx *mnt_ctx)
-{
- int rc = 0;
-
- if (mnt_ctx->tcon)
- cifs_put_tcon(mnt_ctx->tcon);
- else if (mnt_ctx->ses)
- cifs_put_smb_ses(mnt_ctx->ses);
- else if (mnt_ctx->server)
- cifs_put_tcp_session(mnt_ctx->server, 0);
- mnt_ctx->cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
- free_xid(mnt_ctx->xid);
-}
-
-int cifs_mount_get_session(struct cifs_mount_ctx *mnt_ctx)
-{
- struct TCP_Server_Info *server = NULL;
- struct smb3_fs_context *ctx;
- struct cifs_ses *ses = NULL;
- unsigned int xid;
- int rc = 0;
-
- xid = get_xid();
-
- if (WARN_ON_ONCE(!mnt_ctx || !mnt_ctx->fs_ctx)) {
- rc = -EINVAL;
- goto out;
- }
- ctx = mnt_ctx->fs_ctx;
-
- /* get a reference to a tcp session */
- server = cifs_get_tcp_session(ctx, NULL);
- if (IS_ERR(server)) {
- rc = PTR_ERR(server);
- server = NULL;
- goto out;
- }
-
- /* get a reference to a SMB session */
- ses = cifs_get_smb_ses(server, ctx);
- if (IS_ERR(ses)) {
- rc = PTR_ERR(ses);
- ses = NULL;
- goto out;
- }
-
- if ((ctx->persistent == true) && (!(ses->server->capabilities &
- SMB2_GLOBAL_CAP_PERSISTENT_HANDLES))) {
- cifs_server_dbg(VFS, "persistent handles not supported by server\n");
- rc = -EOPNOTSUPP;
- }
-
-out:
- mnt_ctx->xid = xid;
- mnt_ctx->server = server;
- mnt_ctx->ses = ses;
- mnt_ctx->tcon = NULL;
-
- return rc;
-}
-
-int cifs_mount_get_tcon(struct cifs_mount_ctx *mnt_ctx)
-{
- struct TCP_Server_Info *server;
- struct cifs_sb_info *cifs_sb;
- struct smb3_fs_context *ctx;
- struct cifs_tcon *tcon = NULL;
- int rc = 0;
-
- if (WARN_ON_ONCE(!mnt_ctx || !mnt_ctx->server || !mnt_ctx->ses || !mnt_ctx->fs_ctx ||
- !mnt_ctx->cifs_sb)) {
- rc = -EINVAL;
- goto out;
- }
- server = mnt_ctx->server;
- ctx = mnt_ctx->fs_ctx;
- cifs_sb = mnt_ctx->cifs_sb;
-
- /* search for existing tcon to this server share */
- tcon = cifs_get_tcon(mnt_ctx->ses, ctx);
- if (IS_ERR(tcon)) {
- rc = PTR_ERR(tcon);
- tcon = NULL;
- goto out;
- }
-
- /* if new SMB3.11 POSIX extensions are supported do not remap / and \ */
- if (tcon->posix_extensions)
- cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_POSIX_PATHS;
-
-#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
- /* tell server which Unix caps we support */
- if (cap_unix(tcon->ses)) {
- /*
- * reset of caps checks mount to see if unix extensions disabled
- * for just this mount.
- */
- reset_cifs_unix_caps(mnt_ctx->xid, tcon, cifs_sb, ctx);
- spin_lock(&tcon->ses->server->srv_lock);
- if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
- (le64_to_cpu(tcon->fsUnixInfo.Capability) &
- CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
- spin_unlock(&tcon->ses->server->srv_lock);
- rc = -EACCES;
- goto out;
- }
- spin_unlock(&tcon->ses->server->srv_lock);
- } else
-#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
- tcon->unix_ext = 0; /* server does not support them */
-
- /* do not care if a following call succeed - informational */
- if (!tcon->pipe && server->ops->qfs_tcon) {
- server->ops->qfs_tcon(mnt_ctx->xid, tcon, cifs_sb);
- if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE) {
- if (tcon->fsDevInfo.DeviceCharacteristics &
- cpu_to_le32(FILE_READ_ONLY_DEVICE))
- cifs_dbg(VFS, "mounted to read only share\n");
- else if ((cifs_sb->mnt_cifs_flags &
- CIFS_MOUNT_RW_CACHE) == 0)
- cifs_dbg(VFS, "read only mount of RW share\n");
- /* no need to log a RW mount of a typical RW share */
- }
- }
-
- /*
- * Clamp the rsize/wsize mount arguments if they are too big for the server
- * and set the rsize/wsize to the negotiated values if not passed in by
- * the user on mount
- */
- if ((cifs_sb->ctx->wsize == 0) ||
- (cifs_sb->ctx->wsize > server->ops->negotiate_wsize(tcon, ctx)))
- cifs_sb->ctx->wsize = server->ops->negotiate_wsize(tcon, ctx);
- if ((cifs_sb->ctx->rsize == 0) ||
- (cifs_sb->ctx->rsize > server->ops->negotiate_rsize(tcon, ctx)))
- cifs_sb->ctx->rsize = server->ops->negotiate_rsize(tcon, ctx);
-
- /*
- * The cookie is initialized from volume info returned above.
- * Inside cifs_fscache_get_super_cookie it checks
- * that we do not get super cookie twice.
- */
- if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
- cifs_fscache_get_super_cookie(tcon);
-
-out:
- mnt_ctx->tcon = tcon;
- return rc;
-}
-
-static int mount_setup_tlink(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
- struct cifs_tcon *tcon)
-{
- struct tcon_link *tlink;
-
- /* hang the tcon off of the superblock */
- tlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
- if (tlink == NULL)
- return -ENOMEM;
-
- tlink->tl_uid = ses->linux_uid;
- tlink->tl_tcon = tcon;
- tlink->tl_time = jiffies;
- set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
- set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
-
- cifs_sb->master_tlink = tlink;
- spin_lock(&cifs_sb->tlink_tree_lock);
- tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
- spin_unlock(&cifs_sb->tlink_tree_lock);
-
- queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
- TLINK_IDLE_EXPIRE);
- return 0;
-}
-
-static int
-cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
- unsigned int xid,
- struct cifs_tcon *tcon,
- struct cifs_sb_info *cifs_sb,
- char *full_path,
- int added_treename)
-{
- int rc;
- char *s;
- char sep, tmp;
- int skip = added_treename ? 1 : 0;
-
- sep = CIFS_DIR_SEP(cifs_sb);
- s = full_path;
-
- rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, "");
- while (rc == 0) {
- /* skip separators */
- while (*s == sep)
- s++;
- if (!*s)
- break;
- /* next separator */
- while (*s && *s != sep)
- s++;
- /*
- * if the treename is added, we then have to skip the first
- * part within the separators
- */
- if (skip) {
- skip = 0;
- continue;
- }
- /*
- * temporarily null-terminate the path at the end of
- * the current component
- */
- tmp = *s;
- *s = 0;
- rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
- full_path);
- *s = tmp;
- }
- return rc;
-}
-
-/*
- * Check if path is remote (i.e. a DFS share).
- *
- * Return -EREMOTE if it is, otherwise 0 or -errno.
- */
-int cifs_is_path_remote(struct cifs_mount_ctx *mnt_ctx)
-{
- int rc;
- struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
- struct TCP_Server_Info *server = mnt_ctx->server;
- unsigned int xid = mnt_ctx->xid;
- struct cifs_tcon *tcon = mnt_ctx->tcon;
- struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
- char *full_path;
-
- if (!server->ops->is_path_accessible)
- return -EOPNOTSUPP;
-
- /*
- * cifs_build_path_to_root works only when we have a valid tcon
- */
- full_path = cifs_build_path_to_root(ctx, cifs_sb, tcon,
- tcon->Flags & SMB_SHARE_IS_IN_DFS);
- if (full_path == NULL)
- return -ENOMEM;
-
- cifs_dbg(FYI, "%s: full_path: %s\n", __func__, full_path);
-
- rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
- full_path);
- if (rc != 0 && rc != -EREMOTE)
- goto out;
-
- if (rc != -EREMOTE) {
- rc = cifs_are_all_path_components_accessible(server, xid, tcon,
- cifs_sb, full_path, tcon->Flags & SMB_SHARE_IS_IN_DFS);
- if (rc != 0) {
- cifs_server_dbg(VFS, "cannot query dirs between root and final path, enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
- cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
- rc = 0;
- }
- }
-
-out:
- kfree(full_path);
- return rc;
-}
-
-#ifdef CONFIG_CIFS_DFS_UPCALL
-int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
-{
- struct cifs_mount_ctx mnt_ctx = { .cifs_sb = cifs_sb, .fs_ctx = ctx, };
- bool isdfs;
- int rc;
-
- INIT_LIST_HEAD(&mnt_ctx.dfs_ses_list);
-
- rc = dfs_mount_share(&mnt_ctx, &isdfs);
- if (rc)
- goto error;
- if (!isdfs)
- goto out;
-
- /*
- * After reconnecting to a different server, unique ids won't match anymore, so we disable
- * serverino. This prevents dentry revalidation to think the dentry are stale (ESTALE).
- */
- cifs_autodisable_serverino(cifs_sb);
- /*
- * Force the use of prefix path to support failover on DFS paths that resolve to targets
- * that have different prefix paths.
- */
- cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
- kfree(cifs_sb->prepath);
- cifs_sb->prepath = ctx->prepath;
- ctx->prepath = NULL;
-
-out:
- cifs_try_adding_channels(cifs_sb, mnt_ctx.ses);
- rc = mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon);
- if (rc)
- goto error;
-
- free_xid(mnt_ctx.xid);
- return rc;
-
-error:
- dfs_put_root_smb_sessions(&mnt_ctx.dfs_ses_list);
- cifs_mount_put_conns(&mnt_ctx);
- return rc;
-}
-#else
-int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
-{
- int rc = 0;
- struct cifs_mount_ctx mnt_ctx = { .cifs_sb = cifs_sb, .fs_ctx = ctx, };
-
- rc = cifs_mount_get_session(&mnt_ctx);
- if (rc)
- goto error;
-
- rc = cifs_mount_get_tcon(&mnt_ctx);
- if (rc)
- goto error;
-
- rc = cifs_is_path_remote(&mnt_ctx);
- if (rc == -EREMOTE)
- rc = -EOPNOTSUPP;
- if (rc)
- goto error;
-
- rc = mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon);
- if (rc)
- goto error;
-
- free_xid(mnt_ctx.xid);
- return rc;
-
-error:
- cifs_mount_put_conns(&mnt_ctx);
- return rc;
-}
-#endif
-
-/*
- * Issue a TREE_CONNECT request.
- */
-int
-CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
- const char *tree, struct cifs_tcon *tcon,
- const struct nls_table *nls_codepage)
-{
- struct smb_hdr *smb_buffer;
- struct smb_hdr *smb_buffer_response;
- TCONX_REQ *pSMB;
- TCONX_RSP *pSMBr;
- unsigned char *bcc_ptr;
- int rc = 0;
- int length;
- __u16 bytes_left, count;
-
- if (ses == NULL)
- return -EIO;
-
- smb_buffer = cifs_buf_get();
- if (smb_buffer == NULL)
- return -ENOMEM;
-
- smb_buffer_response = smb_buffer;
-
- header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
- NULL /*no tid */ , 4 /*wct */ );
-
- smb_buffer->Mid = get_next_mid(ses->server);
- smb_buffer->Uid = ses->Suid;
- pSMB = (TCONX_REQ *) smb_buffer;
- pSMBr = (TCONX_RSP *) smb_buffer_response;
-
- pSMB->AndXCommand = 0xFF;
- pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
- bcc_ptr = &pSMB->Password[0];
-
- pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
- *bcc_ptr = 0; /* password is null byte */
- bcc_ptr++; /* skip password */
- /* already aligned so no need to do it below */
-
- if (ses->server->sign)
- smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
-
- if (ses->capabilities & CAP_STATUS32) {
- smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
- }
- if (ses->capabilities & CAP_DFS) {
- smb_buffer->Flags2 |= SMBFLG2_DFS;
- }
- if (ses->capabilities & CAP_UNICODE) {
- smb_buffer->Flags2 |= SMBFLG2_UNICODE;
- length =
- cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
- 6 /* max utf8 char length in bytes */ *
- (/* server len*/ + 256 /* share len */), nls_codepage);
- bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
- bcc_ptr += 2; /* skip trailing null */
- } else { /* ASCII */
- strcpy(bcc_ptr, tree);
- bcc_ptr += strlen(tree) + 1;
- }
- strcpy(bcc_ptr, "?????");
- bcc_ptr += strlen("?????");
- bcc_ptr += 1;
- count = bcc_ptr - &pSMB->Password[0];
- be32_add_cpu(&pSMB->hdr.smb_buf_length, count);
- pSMB->ByteCount = cpu_to_le16(count);
-
- rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
- 0);
-
- /* above now done in SendReceive */
- if (rc == 0) {
- bool is_unicode;
-
- tcon->tid = smb_buffer_response->Tid;
- bcc_ptr = pByteArea(smb_buffer_response);
- bytes_left = get_bcc(smb_buffer_response);
- length = strnlen(bcc_ptr, bytes_left - 2);
- if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
- is_unicode = true;
- else
- is_unicode = false;
-
-
- /* skip service field (NB: this field is always ASCII) */
- if (length == 3) {
- if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
- (bcc_ptr[2] == 'C')) {
- cifs_dbg(FYI, "IPC connection\n");
- tcon->ipc = true;
- tcon->pipe = true;
- }
- } else if (length == 2) {
- if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
- /* the most common case */
- cifs_dbg(FYI, "disk share connection\n");
- }
- }
- bcc_ptr += length + 1;
- bytes_left -= (length + 1);
- strscpy(tcon->tree_name, tree, sizeof(tcon->tree_name));
-
- /* mostly informational -- no need to fail on error here */
- kfree(tcon->nativeFileSystem);
- tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
- bytes_left, is_unicode,
- nls_codepage);
-
- cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
-
- if ((smb_buffer_response->WordCount == 3) ||
- (smb_buffer_response->WordCount == 7))
- /* field is in same location */
- tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
- else
- tcon->Flags = 0;
- cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
- }
-
- cifs_buf_release(smb_buffer);
- return rc;
-}
-
-static void delayed_free(struct rcu_head *p)
-{
- struct cifs_sb_info *cifs_sb = container_of(p, struct cifs_sb_info, rcu);
-
- unload_nls(cifs_sb->local_nls);
- smb3_cleanup_fs_context(cifs_sb->ctx);
- kfree(cifs_sb);
-}
-
-void
-cifs_umount(struct cifs_sb_info *cifs_sb)
-{
- struct rb_root *root = &cifs_sb->tlink_tree;
- struct rb_node *node;
- struct tcon_link *tlink;
-
- cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
-
- spin_lock(&cifs_sb->tlink_tree_lock);
- while ((node = rb_first(root))) {
- tlink = rb_entry(node, struct tcon_link, tl_rbnode);
- cifs_get_tlink(tlink);
- clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
- rb_erase(node, root);
-
- spin_unlock(&cifs_sb->tlink_tree_lock);
- cifs_put_tlink(tlink);
- spin_lock(&cifs_sb->tlink_tree_lock);
- }
- spin_unlock(&cifs_sb->tlink_tree_lock);
-
- kfree(cifs_sb->prepath);
- call_rcu(&cifs_sb->rcu, delayed_free);
-}
-
-int
-cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses,
- struct TCP_Server_Info *server)
-{
- int rc = 0;
-
- if (!server->ops->need_neg || !server->ops->negotiate)
- return -ENOSYS;
-
- /* only send once per connect */
- spin_lock(&server->srv_lock);
- if (server->tcpStatus != CifsGood &&
- server->tcpStatus != CifsNew &&
- server->tcpStatus != CifsNeedNegotiate) {
- spin_unlock(&server->srv_lock);
- return -EHOSTDOWN;
- }
-
- if (!server->ops->need_neg(server) &&
- server->tcpStatus == CifsGood) {
- spin_unlock(&server->srv_lock);
- return 0;
- }
-
- server->tcpStatus = CifsInNegotiate;
- spin_unlock(&server->srv_lock);
-
- rc = server->ops->negotiate(xid, ses, server);
- if (rc == 0) {
- spin_lock(&server->srv_lock);
- if (server->tcpStatus == CifsInNegotiate)
- server->tcpStatus = CifsGood;
- else
- rc = -EHOSTDOWN;
- spin_unlock(&server->srv_lock);
- } else {
- spin_lock(&server->srv_lock);
- if (server->tcpStatus == CifsInNegotiate)
- server->tcpStatus = CifsNeedNegotiate;
- spin_unlock(&server->srv_lock);
- }
-
- return rc;
-}
-
-int
-cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
- struct TCP_Server_Info *server,
- struct nls_table *nls_info)
-{
- int rc = -ENOSYS;
- struct TCP_Server_Info *pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
- struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&pserver->dstaddr;
- struct sockaddr_in *addr = (struct sockaddr_in *)&pserver->dstaddr;
- bool is_binding = false;
-
- spin_lock(&ses->ses_lock);
- cifs_dbg(FYI, "%s: channel connect bitmap: 0x%lx\n",
- __func__, ses->chans_need_reconnect);
-
- if (ses->ses_status != SES_GOOD &&
- ses->ses_status != SES_NEW &&
- ses->ses_status != SES_NEED_RECON) {
- spin_unlock(&ses->ses_lock);
- return -EHOSTDOWN;
- }
-
- /* only send once per connect */
- spin_lock(&ses->chan_lock);
- if (CIFS_ALL_CHANS_GOOD(ses)) {
- if (ses->ses_status == SES_NEED_RECON)
- ses->ses_status = SES_GOOD;
- spin_unlock(&ses->chan_lock);
- spin_unlock(&ses->ses_lock);
- return 0;
- }
-
- cifs_chan_set_in_reconnect(ses, server);
- is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
- spin_unlock(&ses->chan_lock);
-
- if (!is_binding)
- ses->ses_status = SES_IN_SETUP;
- spin_unlock(&ses->ses_lock);
-
- /* update ses ip_addr only for primary chan */
- if (server == pserver) {
- if (server->dstaddr.ss_family == AF_INET6)
- scnprintf(ses->ip_addr, sizeof(ses->ip_addr), "%pI6", &addr6->sin6_addr);
- else
- scnprintf(ses->ip_addr, sizeof(ses->ip_addr), "%pI4", &addr->sin_addr);
- }
-
- if (!is_binding) {
- ses->capabilities = server->capabilities;
- if (!linuxExtEnabled)
- ses->capabilities &= (~server->vals->cap_unix);
-
- if (ses->auth_key.response) {
- cifs_dbg(FYI, "Free previous auth_key.response = %p\n",
- ses->auth_key.response);
- kfree_sensitive(ses->auth_key.response);
- ses->auth_key.response = NULL;
- ses->auth_key.len = 0;
- }
- }
-
- cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
- server->sec_mode, server->capabilities, server->timeAdj);
-
- if (server->ops->sess_setup)
- rc = server->ops->sess_setup(xid, ses, server, nls_info);
-
- if (rc) {
- cifs_server_dbg(VFS, "Send error in SessSetup = %d\n", rc);
- spin_lock(&ses->ses_lock);
- if (ses->ses_status == SES_IN_SETUP)
- ses->ses_status = SES_NEED_RECON;
- spin_lock(&ses->chan_lock);
- cifs_chan_clear_in_reconnect(ses, server);
- spin_unlock(&ses->chan_lock);
- spin_unlock(&ses->ses_lock);
- } else {
- spin_lock(&ses->ses_lock);
- if (ses->ses_status == SES_IN_SETUP)
- ses->ses_status = SES_GOOD;
- spin_lock(&ses->chan_lock);
- cifs_chan_clear_in_reconnect(ses, server);
- cifs_chan_clear_need_reconnect(ses, server);
- spin_unlock(&ses->chan_lock);
- spin_unlock(&ses->ses_lock);
- }
-
- return rc;
-}
-
-static int
-cifs_set_vol_auth(struct smb3_fs_context *ctx, struct cifs_ses *ses)
-{
- ctx->sectype = ses->sectype;
-
- /* krb5 is special, since we don't need username or pw */
- if (ctx->sectype == Kerberos)
- return 0;
-
- return cifs_set_cifscreds(ctx, ses);
-}
-
-static struct cifs_tcon *
-cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
-{
- int rc;
- struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
- struct cifs_ses *ses;
- struct cifs_tcon *tcon = NULL;
- struct smb3_fs_context *ctx;
-
- ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
- if (ctx == NULL)
- return ERR_PTR(-ENOMEM);
-
- ctx->local_nls = cifs_sb->local_nls;
- ctx->linux_uid = fsuid;
- ctx->cred_uid = fsuid;
- ctx->UNC = master_tcon->tree_name;
- ctx->retry = master_tcon->retry;
- ctx->nocase = master_tcon->nocase;
- ctx->nohandlecache = master_tcon->nohandlecache;
- ctx->local_lease = master_tcon->local_lease;
- ctx->no_lease = master_tcon->no_lease;
- ctx->resilient = master_tcon->use_resilient;
- ctx->persistent = master_tcon->use_persistent;
- ctx->handle_timeout = master_tcon->handle_timeout;
- ctx->no_linux_ext = !master_tcon->unix_ext;
- ctx->linux_ext = master_tcon->posix_extensions;
- ctx->sectype = master_tcon->ses->sectype;
- ctx->sign = master_tcon->ses->sign;
- ctx->seal = master_tcon->seal;
- ctx->witness = master_tcon->use_witness;
-
- rc = cifs_set_vol_auth(ctx, master_tcon->ses);
- if (rc) {
- tcon = ERR_PTR(rc);
- goto out;
- }
-
- /* get a reference for the same TCP session */
- spin_lock(&cifs_tcp_ses_lock);
- ++master_tcon->ses->server->srv_count;
- spin_unlock(&cifs_tcp_ses_lock);
-
- ses = cifs_get_smb_ses(master_tcon->ses->server, ctx);
- if (IS_ERR(ses)) {
- tcon = (struct cifs_tcon *)ses;
- cifs_put_tcp_session(master_tcon->ses->server, 0);
- goto out;
- }
-
- tcon = cifs_get_tcon(ses, ctx);
- if (IS_ERR(tcon)) {
- cifs_put_smb_ses(ses);
- goto out;
- }
-
-#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
- if (cap_unix(ses))
- reset_cifs_unix_caps(0, tcon, NULL, ctx);
-#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
-
-out:
- kfree(ctx->username);
- kfree_sensitive(ctx->password);
- kfree(ctx);
-
- return tcon;
-}
-
-struct cifs_tcon *
-cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
-{
- return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
-}
-
-/* find and return a tlink with given uid */
-static struct tcon_link *
-tlink_rb_search(struct rb_root *root, kuid_t uid)
-{
- struct rb_node *node = root->rb_node;
- struct tcon_link *tlink;
-
- while (node) {
- tlink = rb_entry(node, struct tcon_link, tl_rbnode);
-
- if (uid_gt(tlink->tl_uid, uid))
- node = node->rb_left;
- else if (uid_lt(tlink->tl_uid, uid))
- node = node->rb_right;
- else
- return tlink;
- }
- return NULL;
-}
-
-/* insert a tcon_link into the tree */
-static void
-tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
-{
- struct rb_node **new = &(root->rb_node), *parent = NULL;
- struct tcon_link *tlink;
-
- while (*new) {
- tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
- parent = *new;
-
- if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
- new = &((*new)->rb_left);
- else
- new = &((*new)->rb_right);
- }
-
- rb_link_node(&new_tlink->tl_rbnode, parent, new);
- rb_insert_color(&new_tlink->tl_rbnode, root);
-}
-
-/*
- * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
- * current task.
- *
- * If the superblock doesn't refer to a multiuser mount, then just return
- * the master tcon for the mount.
- *
- * First, search the rbtree for an existing tcon for this fsuid. If one
- * exists, then check to see if it's pending construction. If it is then wait
- * for construction to complete. Once it's no longer pending, check to see if
- * it failed and either return an error or retry construction, depending on
- * the timeout.
- *
- * If one doesn't exist then insert a new tcon_link struct into the tree and
- * try to construct a new one.
- */
-struct tcon_link *
-cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
-{
- int ret;
- kuid_t fsuid = current_fsuid();
- struct tcon_link *tlink, *newtlink;
-
- if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
- return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
-
- spin_lock(&cifs_sb->tlink_tree_lock);
- tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
- if (tlink)
- cifs_get_tlink(tlink);
- spin_unlock(&cifs_sb->tlink_tree_lock);
-
- if (tlink == NULL) {
- newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
- if (newtlink == NULL)
- return ERR_PTR(-ENOMEM);
- newtlink->tl_uid = fsuid;
- newtlink->tl_tcon = ERR_PTR(-EACCES);
- set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
- set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
- cifs_get_tlink(newtlink);
-
- spin_lock(&cifs_sb->tlink_tree_lock);
- /* was one inserted after previous search? */
- tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
- if (tlink) {
- cifs_get_tlink(tlink);
- spin_unlock(&cifs_sb->tlink_tree_lock);
- kfree(newtlink);
- goto wait_for_construction;
- }
- tlink = newtlink;
- tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
- spin_unlock(&cifs_sb->tlink_tree_lock);
- } else {
-wait_for_construction:
- ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
- TASK_INTERRUPTIBLE);
- if (ret) {
- cifs_put_tlink(tlink);
- return ERR_PTR(-ERESTARTSYS);
- }
-
- /* if it's good, return it */
- if (!IS_ERR(tlink->tl_tcon))
- return tlink;
-
- /* return error if we tried this already recently */
- if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
- cifs_put_tlink(tlink);
- return ERR_PTR(-EACCES);
- }
-
- if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
- goto wait_for_construction;
- }
-
- tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
- clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
- wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
-
- if (IS_ERR(tlink->tl_tcon)) {
- cifs_put_tlink(tlink);
- return ERR_PTR(-EACCES);
- }
-
- return tlink;
-}
-
-/*
- * periodic workqueue job that scans tcon_tree for a superblock and closes
- * out tcons.
- */
-static void
-cifs_prune_tlinks(struct work_struct *work)
-{
- struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
- prune_tlinks.work);
- struct rb_root *root = &cifs_sb->tlink_tree;
- struct rb_node *node;
- struct rb_node *tmp;
- struct tcon_link *tlink;
-
- /*
- * Because we drop the spinlock in the loop in order to put the tlink
- * it's not guarded against removal of links from the tree. The only
- * places that remove entries from the tree are this function and
- * umounts. Because this function is non-reentrant and is canceled
- * before umount can proceed, this is safe.
- */
- spin_lock(&cifs_sb->tlink_tree_lock);
- node = rb_first(root);
- while (node != NULL) {
- tmp = node;
- node = rb_next(tmp);
- tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
-
- if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
- atomic_read(&tlink->tl_count) != 0 ||
- time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
- continue;
-
- cifs_get_tlink(tlink);
- clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
- rb_erase(tmp, root);
-
- spin_unlock(&cifs_sb->tlink_tree_lock);
- cifs_put_tlink(tlink);
- spin_lock(&cifs_sb->tlink_tree_lock);
- }
- spin_unlock(&cifs_sb->tlink_tree_lock);
-
- queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
- TLINK_IDLE_EXPIRE);
-}
-
-#ifndef CONFIG_CIFS_DFS_UPCALL
-int cifs_tree_connect(const unsigned int xid, struct cifs_tcon *tcon, const struct nls_table *nlsc)
-{
- int rc;
- const struct smb_version_operations *ops = tcon->ses->server->ops;
-
- /* only send once per connect */
- spin_lock(&tcon->tc_lock);
- if (tcon->status != TID_NEW &&
- tcon->status != TID_NEED_TCON) {
- spin_unlock(&tcon->tc_lock);
- return -EHOSTDOWN;
- }
-
- if (tcon->status == TID_GOOD) {
- spin_unlock(&tcon->tc_lock);
- return 0;
- }
- tcon->status = TID_IN_TCON;
- spin_unlock(&tcon->tc_lock);
-
- rc = ops->tree_connect(xid, tcon->ses, tcon->tree_name, tcon, nlsc);
- if (rc) {
- spin_lock(&tcon->tc_lock);
- if (tcon->status == TID_IN_TCON)
- tcon->status = TID_NEED_TCON;
- spin_unlock(&tcon->tc_lock);
- } else {
- spin_lock(&tcon->tc_lock);
- if (tcon->status == TID_IN_TCON)
- tcon->status = TID_GOOD;
- tcon->need_reconnect = false;
- spin_unlock(&tcon->tc_lock);
- }
-
- return rc;
-}
-#endif
git.samba.org / sfrench / cifs-2.6.git / blobdiff