| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Paulo Alcantara | 3809 | 19.47% | 67 | 10.34% |
| Jeff Layton | 3615 | 18.48% | 90 | 13.89% |
| Steve French | 2809 | 14.36% | 203 | 31.33% |
| Ronnie Sahlberg | 2602 | 13.30% | 27 | 4.17% |
| Shyam Prasad N | 2394 | 12.24% | 64 | 9.88% |
| Pavel Shilovsky | 1331 | 6.80% | 42 | 6.48% |
| Sachin S. Prabhu | 571 | 2.92% | 11 | 1.70% |
| Aurelien Aptel | 486 | 2.48% | 11 | 1.70% |
| Ben Greear | 291 | 1.49% | 1 | 0.15% |
| Samuel Cabrero | 230 | 1.18% | 7 | 1.08% |
| Joe Perches | 178 | 0.91% | 3 | 0.46% |
| Stefan Metzmacher | 134 | 0.68% | 3 | 0.46% |
| Shirish Pargaonkar | 128 | 0.65% | 8 | 1.23% |
| Long Li | 128 | 0.65% | 4 | 0.62% |
| David Howells | 111 | 0.57% | 7 | 1.08% |
| Winston Wen | 63 | 0.32% | 2 | 0.31% |
| Eric W. Biedermann | 60 | 0.31% | 6 | 0.93% |
| Suresh Jayaraman | 56 | 0.29% | 9 | 1.39% |
| Rob Landley | 55 | 0.28% | 1 | 0.15% |
| ZhangXiaoxu | 51 | 0.26% | 4 | 0.62% |
| Sean Finney | 48 | 0.25% | 4 | 0.62% |
| Kenneth D'souza | 44 | 0.22% | 1 | 0.15% |
| Rohith Surabattula | 42 | 0.21% | 2 | 0.31% |
| Igor Mammedov | 37 | 0.19% | 6 | 0.93% |
| Al Viro | 35 | 0.18% | 9 | 1.39% |
| Enzo Matsumiya | 33 | 0.17% | 7 | 1.08% |
| Paul Aurich | 30 | 0.15% | 5 | 0.77% |
| Shu Wang | 23 | 0.12% | 1 | 0.15% |
| Christoph Hellwig | 20 | 0.10% | 4 | 0.62% |
| Ryan Bair | 13 | 0.07% | 1 | 0.15% |
| Vincent Whitchurch | 11 | 0.06% | 1 | 0.15% |
| Germano Percossi | 11 | 0.06% | 1 | 0.15% |
| Ross Lagerwall | 10 | 0.05% | 1 | 0.15% |
| Eric Biggers | 8 | 0.04% | 1 | 0.15% |
| Benjamin Coddington | 8 | 0.04% | 1 | 0.15% |
| Jeremy Allison | 7 | 0.04% | 1 | 0.15% |
| Zeng Heng | 6 | 0.03% | 1 | 0.15% |
| Taesoo Kim | 6 | 0.03% | 1 | 0.15% |
| Lars Persson | 5 | 0.03% | 1 | 0.15% |
| Namjae Jeon | 5 | 0.03% | 1 | 0.15% |
| Hannes Frederic Sowa | 4 | 0.02% | 1 | 0.15% |
| Steve French (should it be yesuda sadeh?x) | 4 | 0.02% | 1 | 0.15% |
| Scott Lovenberg | 4 | 0.02% | 1 | 0.15% |
| Daniel N Pettersson | 4 | 0.02% | 1 | 0.15% |
| Thomas Gleixner | 3 | 0.02% | 1 | 0.15% |
| Paul Gortmaker | 3 | 0.02% | 1 | 0.15% |
| Thomas Werschlein | 3 | 0.02% | 1 | 0.15% |
| Rabin Vincent | 3 | 0.02% | 1 | 0.15% |
| Andrew Lunn | 3 | 0.02% | 1 | 0.15% |
| Ingo Molnar | 3 | 0.02% | 1 | 0.15% |
| Nigel Cunningham | 3 | 0.02% | 1 | 0.15% |
| Linus Torvalds | 2 | 0.01% | 2 | 0.31% |
| Amir Goldstein | 2 | 0.01% | 1 | 0.15% |
| Linus Torvalds (pre-git) | 2 | 0.01% | 1 | 0.15% |
| Neil Brown | 2 | 0.01% | 1 | 0.15% |
| Jordan Rife | 2 | 0.01% | 1 | 0.15% |
| Chen Gang S | 2 | 0.01% | 1 | 0.15% |
| Frank Sorenson | 1 | 0.01% | 1 | 0.15% |
| Colin Ian King | 1 | 0.01% | 1 | 0.15% |
| Waiman Long | 1 | 0.01% | 1 | 0.15% |
| Mariusz Kozlowski | 1 | 0.01% | 1 | 0.15% |
| Li Yang | 1 | 0.01% | 1 | 0.15% |
| Wolfram Sang | 1 | 0.01% | 1 | 0.15% |
| Pierre Mariani | 1 | 0.01% | 1 | 0.15% |
| Justin P. Mattock | 1 | 0.01% | 1 | 0.15% |
| Pavel Machek | 1 | 0.01% | 1 | 0.15% |
| Qinglang Miao | 1 | 0.01% | 1 | 0.15% |
| Total | 19563 | 648 |
// 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 MAX_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; int xid; struct cifs_tcon *tcon = container_of(work, struct cifs_tcon, query_interfaces.work); /* * query server network interfaces, in case they change */ xid = get_xid(); rc = SMB3_request_interfaces(xid, tcon, false); free_xid(xid); if (rc) { if (rc == -EOPNOTSUPP) return; 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 = SERVER_IS_CHAN(server) ? server->primary_server : server; /* if we need to signal just this channel */ if (!all_channels) { spin_lock(&server->srv_lock); if (server->tcpStatus != CifsExiting) server->tcpStatus = CifsNeedReconnect; spin_unlock(&server->srv_lock); return; } 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++) { if (!ses->chans[i].server) continue; spin_lock(&ses->chans[i].server->srv_lock); if (ses->chans[i].server->tcpStatus != CifsExiting) 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 = 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; } 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 */ spin_lock(&ses->chan_lock); if (cifs_ses_get_chan_index(ses, server) == CIFS_INVAL_CHAN_INDEX) { spin_unlock(&ses->chan_lock); continue; } if (!cifs_chan_is_iface_active(ses, server)) { spin_unlock(&ses->chan_lock); 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); cancel_delayed_work(&tcon->query_interfaces); } 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) { struct dfs_cache_tgt_iterator *target_hint = NULL; DFS_CACHE_TGT_LIST(tl); int num_targets = 0; int rc = 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 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); 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->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; bool pending_reconnect = false; 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; pending_reconnect = false; 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) { 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; } 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 > MAX_STATUS_IO_TIMEOUT) { cifs_server_dbg(VFS, "Number of request timeouts exceeded %d. Reconnecting", MAX_STATUS_IO_TIMEOUT); pending_reconnect = true; num_io_timeout = 0; } } 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] != NULL) { if (server->ops->is_network_name_deleted && server->ops->is_network_name_deleted(bufs[i], server)) { cifs_server_dbg(FYI, "Share deleted. Reconnect needed"); } } 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; } /* 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); 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); } int cifs_ipaddr_cmp(struct sockaddr *srcaddr, struct sockaddr *rhs) { struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr; struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs; struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr; struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs; switch (srcaddr->sa_family) { case AF_UNSPEC: switch (rhs->sa_family) { case AF_UNSPEC: return 0; case AF_INET: case AF_INET6: return 1; default: return -1; } case AF_INET: { switch (rhs->sa_family) { case AF_UNSPEC: return -1; case AF_INET: return memcmp(saddr4, vaddr4, sizeof(struct sockaddr_in)); case AF_INET6: return 1; default: return -1; } } case AF_INET6: { switch (rhs->sa_family) { case AF_UNSPEC: case AF_INET: return -1; case AF_INET6: return memcmp(saddr6, vaddr6, sizeof(struct sockaddr_in6)); default: return -1; } } default: return -1; /* don't expect to be here */ } } /* * 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, 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 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; /* * When matching cifs.ko superblocks (@match_super == true), we can't * really match either @server->leaf_fullpath or @server->dstaddr * directly since this @server might belong to a completely different * server -- in case of domain-based DFS referrals or DFS links -- as * provided earlier by mount(2) through 'source' and 'ip' options. * * Otherwise, match the DFS referral in @server->leaf_fullpath or the * destination address in @server->dstaddr. * * When using 'nodfs' mount option, we avoid sharing it with DFS * connections as they might failover. */ if (!match_super) { if (!ctx->nodfs) { 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->leaf_fullpath) { return 0; } } /* * Match for a regular connection (address/hostname/port) which has no * DFS referrals set. */ if (!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; if (server->retrans != ctx->retrans) 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 (SERVER_IS_CHAN(server) || !match_server(server, ctx, false)) { 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); 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); /* 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); 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->channel_sequence_num = 0; /* only tracked for primary channel */ 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; 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); 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 (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; } 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. */ 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$")] = {0}; bool seal = false; struct TCP_Server_Info *server = ses->server; /* * If the mount request that resulted in the creation of the * session requires encryption, force IPC to be encrypted too. */ if (ctx->seal) { if (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION) seal = true; else { cifs_server_dbg(VFS, "IPC: server doesn't support encryption\n"); return -EOPNOTSUPP; } } /* no need to setup directory caching on IPC share, so pass in false */ tcon = tcon_info_alloc(false); if (tcon == NULL) return -ENOMEM; spin_lock(&server->srv_lock); scnprintf(unc, sizeof(unc), "\\\\%s\\IPC$", 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) { struct TCP_Server_Info *server = ses->server; unsigned int xid; size_t i; int rc; 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_lock(&ses->ses_lock); if (ses->ses_status == SES_GOOD) ses->ses_status = SES_EXITING; spin_unlock(&ses->ses_lock); 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_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); /* 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; } 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; ses->local_nls = load_nls(ctx->local_nls->charset); /* 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; if (tcon->origin_fullpath) { if (!ctx->source || !dfs_src_pathname_equal(ctx->source, tcon->origin_fullpath)) return 0; } else if (!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) { 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 (ses->server->dialect >= SMB20_PROT_ID && (ses->server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING)) nohandlecache = ctx->nohandlecache; else nohandlecache = true; tcon = tcon_info_alloc(!nohandlecache); if (tcon == NULL) { rc = -ENOMEM; goto out_fail; } tcon->nohandlecache = nohandlecache; 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; tcon->max_cached_dirs = ctx->max_cached_dirs; 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); } 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 cifs_tcon *tcon, 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 (tcon->origin_fullpath && dfs_src_pathname_equal(tcon->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 (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; 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, true) || !match_session(ses, ctx) || !match_tcon(tcon, ctx) || !match_prepath(sb, tcon, 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 = kernel_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) { struct sockaddr *saddr; struct socket *socket; int slen, sfamily; __be16 sport; int rc = 0; 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 (server->ssocket) { socket = server->ssocket; } else { rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM, IPPROTO_TCP, &server->ssocket, 1); if (rc < 0) { cifs_server_dbg(VFS, "Error %d creating socket\n", rc); return rc; } /* 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); cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n", socket->sk->sk_sndbuf, socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo); 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); 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 = round_down(server->ops->negotiate_wsize(tcon, ctx), PAGE_SIZE); /* * in the very unlikely event that the server sent a max write size under PAGE_SIZE, * (which would get rounded down to 0) then reset wsize to absolute minimum eg 4096 */ if (cifs_sb->ctx->wsize == 0) { cifs_sb->ctx->wsize = PAGE_SIZE; cifs_dbg(VFS, "wsize too small, reset to minimum ie PAGE_SIZE, usually 4096\n"); } } 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(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 = 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; /* 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); 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 is marked for needing reconnect, update state */ if (tcon->need_reconnect) tcon->status = TID_NEED_TCON; if (tcon->status == TID_GOOD) { spin_unlock(&tcon->tc_lock); return 0; } if (tcon->status != TID_NEW && tcon->status != TID_NEED_TCON) { spin_unlock(&tcon->tc_lock); return -EHOSTDOWN; } 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
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