/* * 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.
*/ staticint reconn_set_ipaddr_from_hostname(struct TCP_Server_Info *server)
{ struct sockaddr_storage ss; int rc;
if (!server->hostname) return -EINVAL;
/* if server hostname isn't populated, there's nothing to do here */ if (server->hostname[0] == '\0') return 0;
spin_lock(&server->srv_lock);
ss = server->dstaddr;
spin_unlock(&server->srv_lock);
#define set_need_reco(server) \ do { \
spin_lock(&server->srv_lock); \ if (server->tcpStatus != CifsExiting) \
server->tcpStatus = CifsNeedReconnect; \
spin_unlock(&server->srv_lock); \
} while (0)
/* * 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 *nserver; struct cifs_ses *ses;
LIST_HEAD(reco); int i;
/* if we need to signal just this channel */ if (!all_channels) {
set_need_reco(server); return;
}
if (SERVER_IS_CHAN(server))
server = server->primary_server;
scoped_guard(spinlock, &cifs_tcp_ses_lock) {
set_need_reco(server);
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); for (i = 1; i < ses->chan_count; i++) {
nserver = ses->chans[i].server; if (!nserver) continue;
nserver->srv_count++;
list_add(&nserver->rlist, &reco);
}
spin_unlock(&ses->chan_lock);
spin_unlock(&ses->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 = SERVER_IS_CHAN(server) ? server->primary_server : server;
/* * if the server has been marked for termination, there is a * chance that the remaining channels all need reconnect. To be * on the safer side, mark the session and trees for reconnect * for this scenario. This might cause a few redundant session * setup and tree connect requests, but it is better than not doing * a tree connect when needed, and all following requests failing
*/ if (server->terminate) {
mark_smb_session = true;
server = pserver;
}
/* 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);
if (cifs_rdma_enabled(server)) {
cifs_server_lock(server);
smbd_destroy(server);
cifs_server_unlock(server);
}
}
staticbool 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); returnfalse;
}
cifs_dbg(FYI, "Mark tcp session as need reconnect\n");
trace_smb3_reconnect(server->current_mid, server->conn_id,
server->hostname);
server->tcpStatus = CifsNeedReconnect;
spin_unlock(&server->srv_lock); returntrue;
}
/* * 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. *
*/ staticint __cifs_reconnect(struct TCP_Server_Info *server, bool mark_smb_session, bool once)
{ int rc = 0;
if (!cifs_tcp_ses_needs_reconnect(server, 1)) return 0;
/* * if smb session has been marked for reconnect, also reconnect all * connections. This way, the other connections do not end up bad.
*/ if (mark_smb_session)
cifs_signal_cifsd_for_reconnect(server, mark_smb_session);
if (!cifs_swn_set_server_dstaddr(server) &&
!SERVER_IS_CHAN(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); /* If was asked to reconnect only once, do not try it more times */ if (once) break;
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);
/* If dfs target list is empty, then reconnect to last server */
tit = dfs_cache_get_tgt_iterator(tl); if (!tit) return __reconnect_target_locked(server, server->hostname);
/* Otherwise, try every dfs target in @tl */ do { constchar *target = dfs_cache_get_tgt_name(tit);
/* * 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.
*/ if (!dfs_cache_noreq_find(ref_path, NULL, &tl))
num_targets = dfs_cache_get_nr_tgts(&tl); 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_locked(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);
/* 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);
staticbool
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 */ returnfalse;
}
} elseif (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 */ returnfalse;
} /* beginning of smb buffer is cleared in our buf_get */
} else { /* if existing small buf clear beginning */
memset(server->smallbuf, 0, HEADER_SIZE(server));
}
returntrue;
}
staticbool
server_unresponsive(struct TCP_Server_Info *server)
{ /* * If we're in the process of mounting a share or reconnecting a session * and the server abruptly shut down (e.g. socket wasn't closed, packet * had been ACK'ed but no SMB response), don't wait longer than 20s from * when negotiate actually started.
*/
spin_lock(&server->srv_lock); if (server->tcpStatus == CifsInNegotiate &&
time_after(jiffies, server->neg_start + 20 * HZ)) {
spin_unlock(&server->srv_lock);
cifs_reconnect(server, false); returntrue;
} /* * 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.
*/ 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); returntrue;
}
spin_unlock(&server->srv_lock);
returnfalse;
}
staticinlinebool
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); returntrue;
}
spin_unlock(&server->req_lock); returnfalse;
}
staticint
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;
}
/* * 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);
staticbool
is_smb_response(struct TCP_Server_Info *server, unsignedchar 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 */ returntrue; case RFC1002_SESSION_KEEP_ALIVE: /* * RFC 1002 session keep alive can sent by the server only when * we established a RFC 1002 session. But Samba servers send * RFC 1002 session keep alive also over port 445 on which * RFC 1002 session is not established.
*/
cifs_dbg(FYI, "RFC 1002 session keep alive\n"); break; case RFC1002_POSITIVE_SESSION_RESPONSE: /* * RFC 1002 positive session response cannot be returned * for SMB request. RFC 1002 session response is handled * exclusively in ip_rfc1001_connect() function.
*/
cifs_server_dbg(VFS, "RFC 1002 positive session response (unexpected)\n");
cifs_reconnect(server, true); break; case RFC1002_NEGATIVE_SESSION_RESPONSE: /* * We get this from Windows 98 instead of an error on * SMB negprot response, when we have not established * RFC 1002 session (which means ip_rfc1001_connect() * was skipped). Note that same still happens with * Windows Server 2022 when connecting via port 139. * So for this case when mount option -o nonbsessinit * was not specified, try to reconnect with establishing * RFC 1002 session. If new socket establishment with * RFC 1002 session was successful then return to the * mid's caller -EAGAIN, so it can retry the request.
*/ if (!cifs_rdma_enabled(server) &&
server->tcpStatus == CifsInNegotiate &&
!server->with_rfc1001 &&
server->rfc1001_sessinit != 0) { int rc, mid_rc; struct mid_q_entry *mid, *nmid;
LIST_HEAD(dispose_list);
cifs_dbg(FYI, "RFC 1002 negative session response during SMB Negotiate, retrying with NetBIOS session\n");
/* * Before reconnect, delete all pending mids for this * server, so reconnect would not signal connection * aborted error to mid's callbacks. Note that for this * server there should be exactly one pending mid * corresponding to SMB1/SMB2 Negotiate packet.
*/
spin_lock(&server->mid_queue_lock);
list_for_each_entry_safe(mid, nmid, &server->pending_mid_q, qhead) {
kref_get(&mid->refcount);
list_move(&mid->qhead, &dispose_list);
mid->deleted_from_q = true;
}
spin_unlock(&server->mid_queue_lock);
/* Now try to reconnect once with NetBIOS session. */
server->with_rfc1001 = true;
rc = cifs_reconnect_once(server);
/* * If reconnect was successful then indicate -EAGAIN * to mid's caller. If reconnect failed with -EAGAIN * then mask it as -EHOSTDOWN, so mid's caller would * know that it failed.
*/ if (rc == 0)
mid_rc = -EAGAIN; elseif (rc == -EAGAIN)
mid_rc = -EHOSTDOWN; else
mid_rc = rc;
/* * After reconnect (either successful or unsuccessful) * deliver reconnect status to mid's caller via mid's * callback. Use MID_RC state which indicates that the * return code should be read from mid_rc member.
*/
list_for_each_entry_safe(mid, nmid, &dispose_list, qhead) {
list_del_init(&mid->qhead);
mid->mid_rc = mid_rc;
mid->mid_state = MID_RC;
mid_execute_callback(mid);
release_mid(mid);
}
/* * If reconnect failed then wait two seconds. In most * cases we were been called from the mount context and * delivered failure to mid's callback will stop this * receiver task thread and fails the mount process. * So wait two seconds to prevent another reconnect * in this task thread, which would be useless as the * mount context will fail at all.
*/ if (rc != 0)
msleep(2000);
} else {
cifs_server_dbg(VFS, "RFC 1002 negative session response (unexpected)\n");
cifs_reconnect(server, true);
} break; case RFC1002_RETARGET_SESSION_RESPONSE:
cifs_server_dbg(VFS, "RFC 1002 retarget session response (unexpected)\n");
cifs_reconnect(server, true); break; default:
cifs_server_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
cifs_reconnect(server, true);
}
returnfalse;
}
void
dequeue_mid(struct mid_q_entry *mid, bool malformed)
{ #ifdef CONFIG_CIFS_STATS2
mid->when_received = jiffies; #endif
spin_lock(&mid->server->mid_queue_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->deleted_from_q == true) {
spin_unlock(&mid->server->mid_queue_lock);
pr_warn_once("trying to dequeue a deleted mid\n");
} else {
list_del_init(&mid->qhead);
mid->deleted_from_q = true;
spin_unlock(&mid->server->mid_queue_lock);
}
}
/* * 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 noinline_for_stack 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);
/* 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;
}
/* 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_execute_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.
*/
}
/* 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(unsignedint, 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;
/* 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) { if (server->ops->next_header(server, buf, &next_offset)) {
cifs_dbg(VFS, "%s: malformed response (next_offset=%u)\n",
__func__, next_offset);
cifs_reconnect(server, true); continue;
} if (next_offset)
server->pdu_size = next_offset;
}
/* do this reconnect at the very end after processing all MIDs */ if (pending_reconnect)
cifs_reconnect(server, true);
} /* 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);
/* 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);
}
return (ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr)
&& saddr6->sin6_scope_id == vaddr6->sin6_scope_id);
} default:
WARN_ON(1); returnfalse; /* 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.
*/ staticbool
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) returntrue;
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); returnfalse;
}
if (!port) {
port = htons(CIFS_PORT); if (port == *sport) returntrue;
staticbool
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) returnfalse;
/* * 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) returnfalse;
returntrue;
}
/* this function must be called with srv_lock held */ staticint match_server(struct TCP_Server_Info *server, struct smb3_fs_context *ctx, bool match_super)
{ 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 (!match_super && (ctx->dfs_conn || server->dfs_conn)) 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;
} elseif (strcmp(ctx->vals->version_string,
SMBDEFAULT_VERSION_STRING) == 0) { if (server->vals->protocol_id < SMB21_PROT_ID) return 0;
} elseif ((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;
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);
/* For secondary channels, we pick up ref-count on the primary server */ if (SERVER_IS_CHAN(server))
cifs_put_tcp_session(server->primary_server, from_reconnect);
tcp_ses->sign = ctx->sign;
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->rfc1001_sessinit = ctx->rfc1001_sessinit;
tcp_ses->with_rfc1001 = false;
tcp_ses->session_estab = false;
tcp_ses->sequence_number = 0;
tcp_ses->channel_sequence_num = 0; /* only tracked for primary channel */
tcp_ses->reconnect_instance = 1;
tcp_ses->lstrp = jiffies;
tcp_ses->compression.requested = ctx->compress;
spin_lock_init(&tcp_ses->req_lock);
spin_lock_init(&tcp_ses->srv_lock);
spin_lock_init(&tcp_ses->mid_queue_lock);
spin_lock_init(&tcp_ses->mid_counter_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);
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;
tcp_ses->echo_interval = ctx->echo_interval * 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;
tcp_ses->retrans = ctx->retrans; /* * 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);
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);
out_err: if (tcp_ses) { if (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 */ staticint match_session(struct cifs_ses *ses, struct smb3_fs_context *ctx, bool match_super)
{ struct TCP_Server_Info *server = ses->server; enum securityEnum ctx_sec, ses_sec;
if (!match_super && ctx->dfs_root_ses != ses->dfs_root_ses) 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 (ctx_sec) { case IAKerb: case Kerberos: if (!uid_eq(ctx->cred_uid, ses->cred_uid)) return 0; break; case NTLMv2: case RawNTLMSSP: default: /* NULL username means anonymous session */ if (ses->user_name == NULL) { if (!ctx->nullauth) return 0; break;
}
/* New mount can only share sessions with an existing mount if: * 1. Both password and password2 match, or * 2. password2 of the old mount matches password of the new mount * and password of the old mount matches password2 of the new * mount
*/ if (ses->password2 != NULL && ctx->password2 != NULL) { if (!((strncmp(ses->password, ctx->password ?
ctx->password : "", CIFS_MAX_PASSWORD_LEN) == 0 &&
strncmp(ses->password2, ctx->password2,
CIFS_MAX_PASSWORD_LEN) == 0) ||
(strncmp(ses->password, ctx->password2,
CIFS_MAX_PASSWORD_LEN) == 0 &&
strncmp(ses->password2, ctx->password ?
ctx->password : "", CIFS_MAX_PASSWORD_LEN) == 0))) return 0;
if (strcmp(ctx->local_nls->charset, ses->local_nls->charset)) 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.
*/ staticint
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;
}
}
/* no need to setup directory caching on IPC share, so pass in false */
tcon = tcon_info_alloc(false, netfs_trace_tcon_ref_new_ipc); if (tcon == NULL) return -ENOMEM;
/* * 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.
*/
tconInfoFree(tcon, netfs_trace_tcon_ref_free_ipc); if (do_logoff) {
xid = get_xid();
rc = server->ops->logoff(xid, ses);
cifs_server_dbg(FYI, "%s: Session Logoff: rc=%d\n",
__func__, rc);
_free_xid(xid);
}
/* close any extra channels */ for (i = 1; i < ses->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;
}
/* we now account for primary channel in iface->refcount */ if (ses->chans[0].iface) {
kref_put(&ses->chans[0].iface->refcount, release_iface);
ses->chans[0].server = NULL;
}
/* 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; /* BB consider adding support for password2 (Key Rotation) for multiuser in future */
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); /* no need to free ctx->password2 since not allocated in this path */
ctx->password = NULL; goto out_key_put;
}
}
/** * 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)
{ struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr; struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr; struct cifs_ses *ses; unsignedint xid; int retries = 0;
size_t len; int rc = 0;
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);
retry_old_session:
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);
}
/* 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);
/* * 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;
list_add(&ses->smb_ses_list, &server->smb_ses_list);
spin_unlock(&cifs_tcp_ses_lock);
/* this function must be called with tc_lock held */ staticint 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;
if (tcon->origin_fullpath) { if (!ctx->source ||
!dfs_src_pathname_equal(ctx->source,
tcon->origin_fullpath)) return 0;
} elseif (!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; if (tcon->posix_extensions != ctx->linux_ext) return 0; return 1;
}
/** * 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.
*/ staticstruct cifs_tcon *
cifs_get_tcon(struct cifs_ses *ses, struct smb3_fs_context *ctx)
{ struct cifs_tcon *tcon; bool nohandlecache; int rc, xid;
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;
}
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;
} elseif (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");
} elseif ((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;
} elseif (ses->server->vals->protocol_id == SMB10_PROT_ID) if (cap_unix(ses))
cifs_dbg(FYI, "Unix Extensions requested on SMB1 mount\n"); else {
cifs_dbg(VFS, "SMB1 Unix Extensions not supported by server\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;
}
}
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;
} elseif (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;
}
} elseif ((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;
} elseif (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"); elseif (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;
tcon->max_cached_dirs = ctx->max_cached_dirs;
tcon->nodelete = ctx->nodelete;
tcon->local_lease = ctx->local_lease;
tcon->status = TID_GOOD;
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; if (old->ctx->reparse_type != new->ctx->reparse_type) return 0; if (old->ctx->nonativesocket != new->ctx->nonativesocket) return 0; if (old->ctx->symlink_type != new->ctx->symlink_type) return 0;
/* 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 (IS_ERR_OR_NULL(tlink)) {
pr_warn_once("%s: skip super matching due to bad tlink(%p)\n",
__func__, tlink);
spin_unlock(&cifs_tcp_ses_lock); return 0;
}
tcon = tlink_tcon(tlink);
ses = tcon->ses;
tcp_srv = ses->server;
/* 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.trailer.session_req);
req.type = RFC1002_SESSION_REQUEST;
req.flags = 0;
req.length = cpu_to_be16(len);
len += offsetof(typeof(req), trailer.session_req);
iov.iov_base = &req;
iov.iov_len = len;
iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, &iov, 1, len);
rc = smb_send_kvec(server, &msg, &sent); if (rc < 0 || len != sent) return (rc == -EINTR || rc == -EAGAIN) ? rc : -ECONNABORTED;
/* * RFC1001 layer in at least one server requires very short break before * negprot presumably because not expecting negprot to follow so fast. * For example DOS SMB servers cannot process negprot if it was received * before the server sent response for SESSION_REQUEST packet. So, wait * for the response, read it and parse it as it can contain useful error * information (e.g. specified server name was incorrect). For example * even the latest Windows Server 2022 SMB1 server over port 139 send * error if its server name was in SESSION_REQUEST packet incorrect. * Nowadays usage of port 139 is not common, so waiting for reply here * does not slowing down mounting of common case (over port 445).
*/
len = offsetof(typeof(resp), trailer);
iov.iov_base = &resp;
iov.iov_len = len;
iov_iter_kvec(&msg.msg_iter, ITER_DEST, &iov, 1, len);
rc = smb_recv_kvec(server, &msg, &recv); if (rc < 0 || recv != len) return (rc == -EINTR || rc == -EAGAIN) ? rc : -ECONNABORTED;
switch (resp.type) { case RFC1002_POSITIVE_SESSION_RESPONSE: if (be16_to_cpu(resp.length) != 0) {
cifs_dbg(VFS, "RFC 1002 positive session response but with invalid non-zero length %u\n",
be16_to_cpu(resp.length)); return -EIO;
}
cifs_dbg(FYI, "RFC 1002 positive session response"); break; case RFC1002_NEGATIVE_SESSION_RESPONSE: /* Read RFC1002 response error code and convert it to errno in rc */
len = sizeof(resp.trailer.neg_ses_resp_error_code);
iov.iov_base = &resp.trailer.neg_ses_resp_error_code;
iov.iov_len = len;
iov_iter_kvec(&msg.msg_iter, ITER_DEST, &iov, 1, len); if (be16_to_cpu(resp.length) == len &&
smb_recv_kvec(server, &msg, &recv) == 0 &&
recv == len) {
cifs_dbg(VFS, "RFC 1002 negative session response with error 0x%x\n",
resp.trailer.neg_ses_resp_error_code); switch (resp.trailer.neg_ses_resp_error_code) { case RFC1002_NOT_LISTENING_CALLED: /* server does not listen for specified server name */
fallthrough; case RFC1002_NOT_PRESENT: /* server name is incorrect */
rc = -ENOENT;
cifs_dbg(VFS, "Server rejected NetBIOS servername %.15s\n",
server->server_RFC1001_name[0] ?
server->server_RFC1001_name :
DEFAULT_CIFS_CALLED_NAME);
cifs_dbg(VFS, "Specify correct NetBIOS servername in source path or with -o servern= option\n"); break; case RFC1002_NOT_LISTENING_CALLING: /* client name was not accepted by server */
rc = -EACCES;
cifs_dbg(VFS, "Server rejected NetBIOS clientname %.15s\n",
server->workstation_RFC1001_name[0] ?
server->workstation_RFC1001_name : "LINUX_CIFS_CLNT");
cifs_dbg(VFS, "Specify correct NetBIOS clientname with -o netbiosname= option\n"); break; case RFC1002_INSUFFICIENT_RESOURCE: /* remote server resource error */
rc = -EREMOTEIO; break; case RFC1002_UNSPECIFIED_ERROR: default: /* other/unknown error */
rc = -EIO; break;
}
} else {
cifs_dbg(VFS, "RFC 1002 negative session response\n");
rc = -EIO;
} return rc; case RFC1002_RETARGET_SESSION_RESPONSE:
cifs_dbg(VFS, "RFC 1002 retarget session response\n"); if (be16_to_cpu(resp.length) == sizeof(resp.trailer.retarget_resp)) {
len = sizeof(resp.trailer.retarget_resp);
iov.iov_base = &resp.trailer.retarget_resp;
iov.iov_len = len;
iov_iter_kvec(&msg.msg_iter, ITER_DEST, &iov, 1, len); if (smb_recv_kvec(server, &msg, &recv) == 0 && recv == len) {
cifs_dbg(VFS, "Server wants to redirect connection\n");
cifs_dbg(VFS, "Remount with options -o ip=%pI4,port=%u\n",
&resp.trailer.retarget_resp.retarget_ip_addr,
be16_to_cpu(resp.trailer.retarget_resp.port));
}
}
cifs_dbg(VFS, "Closing connection\n"); /* FIXME: Should we automatically redirect to new retarget_resp server? */ return -EMULTIHOP; default:
cifs_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", resp.type); return -EIO;
}
server->with_rfc1001 = true; return 0;
}
staticint
generic_ip_connect(struct TCP_Server_Info *server)
{ struct sockaddr *saddr; struct socket *socket; int slen, sfamily;
__be16 sport; int rc = 0;
sk = server->ssocket->sk;
sk_net_refcnt_upgrade(sk);
/* BB other socket options to set KEEPALIVE, NODELAY? */
cifs_dbg(FYI, "Socket created\n");
socket = server->ssocket;
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);
rc = kernel_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);
/* * Establish RFC1001 NetBIOS session when it was explicitly requested * by mount option -o nbsessinit, or when connecting to default RFC1001 * server port (139) and it was not explicitly disabled by mount option * -o nonbsessinit.
*/ if (server->with_rfc1001 ||
server->rfc1001_sessinit == 1 ||
(server->rfc1001_sessinit == -1 && sport == htons(RFC1001_PORT)))
rc = ip_rfc1001_connect(server);
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(unsignedint 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 (!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;
} elseif ((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; elseif (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; elseif (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");
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;
} elseif (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;
/* 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;
}
/* 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 change anything in the * path (i.e., do not remap / and \ and do not map any special characters)
*/ if (tcon->posix_extensions) {
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_POSIX_PATHS;
cifs_sb->mnt_cifs_flags &= ~(CIFS_MOUNT_MAP_SFM_CHR |
CIFS_MOUNT_MAP_SPECIAL_CHR);
}
#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"); elseif ((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 */
}
}
cifs_negotiate_iosize(server, cifs_sb->ctx, tcon); /* * 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);
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; unsignedint 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;
rc = dfs_mount_share(&mnt_ctx); if (rc) goto error; if (!ctx->dfs_conn) 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;
rc = cifs_mount_get_session(&mnt_ctx); if (rc) goto error;
rc = cifs_mount_get_tcon(&mnt_ctx); if (!rc) { /* * Prevent superblock from being created with any missing * connections.
*/ if (WARN_ON(!mnt_ctx.server))
rc = -EHOSTDOWN; elseif (WARN_ON(!mnt_ctx.ses))
rc = -EACCES; elseif (WARN_ON(!mnt_ctx.tcon))
rc = -ENOENT;
} 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;
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);
/* 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;
}
} elseif (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);
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);
/* * reset_cifs_unix_caps calls QFSInfo which requires * need_reconnect to be false, but we would not need to call * reset_caps if this were not a reconnect case so must check * need_reconnect flag here. The caller will also clear * need_reconnect when tcon was successful but needed to be * cleared earlier in the case of unix extensions reconnect
*/ if (tcon->need_reconnect && tcon->unix_ext) {
cifs_dbg(FYI, "resetting caps for %s\n", tcon->tree_name);
tcon->need_reconnect = false;
reset_cifs_unix_caps(xid, tcon, NULL, NULL);
}
}
cifs_buf_release(smb_buffer); return rc;
} #endif/* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
/* 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;
}
if (!is_binding) {
ses->ses_status = SES_IN_SETUP;
/* force iface_list refresh */
ses->iface_last_update = 0;
}
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);
/* * Check if the server supports specified encoding mode. * Zero value in vals->cap_unicode indidcates that chosen * protocol dialect does not support non-UNICODE mode.
*/ if (ses->unicode == 1 && server->vals->cap_unicode != 0 &&
!(server->capabilities & server->vals->cap_unicode)) {
cifs_dbg(VFS, "Server does not support mounting in UNICODE mode\n");
rc = -EOPNOTSUPP;
} elseif (ses->unicode == 0 && server->vals->cap_unicode == 0) {
cifs_dbg(VFS, "Server does not support mounting in non-UNICODE mode\n");
rc = -EOPNOTSUPP;
} elseif (ses->unicode == 0) { /* * When UNICODE mode was explicitly disabled then * do not announce client UNICODE capability.
*/
ses->capabilities &= (~server->vals->cap_unicode);
}
/* * 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. * * REMEMBER to call cifs_put_tlink() after successful calls to cifs_sb_tlink, * to avoid refcount issues
*/ struct tcon_link *
cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
{ struct tcon_link *tlink, *newtlink;
kuid_t fsuid = current_fsuid(); int err;
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 (IS_ERR(tlink->tl_tcon)) {
err = PTR_ERR(tlink->tl_tcon); if (err == -ENOKEY)
err = -EACCES;
cifs_put_tlink(tlink); return ERR_PTR(err);
}
return tlink;
}
/* * periodic workqueue job that scans tcon_tree for a superblock and closes * out tcons.
*/ staticvoid
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);
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