/* * fs/cifs/smb2pdu.c * * Copyright (C) International Business Machines Corp., 2009, 2012 * Etersoft, 2012 * Author(s): Steve French (sfrench@us.ibm.com) * Pavel Shilovsky (pshilovsky@samba.org) 2012 * * Contains the routines for constructing the SMB2 PDUs themselves * * This library is free software; you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published * by the Free Software Foundation; either version 2.1 of the License, or * (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See * the GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */ /* Note that there are handle based routines which must be */ /* treated slightly differently for reconnection purposes since we never */ /* want to reuse a stale file handle and only the caller knows the file info */ #include #include #include #include #include #include #include #include "smb2pdu.h" #include "cifsglob.h" #include "cifsacl.h" #include "cifsproto.h" #include "smb2proto.h" #include "cifs_unicode.h" #include "cifs_debug.h" #include "ntlmssp.h" #include "smb2status.h" #include "smb2glob.h" #include "cifspdu.h" /* * The following table defines the expected "StructureSize" of SMB2 requests * in order by SMB2 command. This is similar to "wct" in SMB/CIFS requests. * * Note that commands are defined in smb2pdu.h in le16 but the array below is * indexed by command in host byte order. */ static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = { /* SMB2_NEGOTIATE */ 36, /* SMB2_SESSION_SETUP */ 25, /* SMB2_LOGOFF */ 4, /* SMB2_TREE_CONNECT */ 9, /* SMB2_TREE_DISCONNECT */ 4, /* SMB2_CREATE */ 57, /* SMB2_CLOSE */ 24, /* SMB2_FLUSH */ 24, /* SMB2_READ */ 49, /* SMB2_WRITE */ 49, /* SMB2_LOCK */ 48, /* SMB2_IOCTL */ 57, /* SMB2_CANCEL */ 4, /* SMB2_ECHO */ 4, /* SMB2_QUERY_DIRECTORY */ 33, /* SMB2_CHANGE_NOTIFY */ 32, /* SMB2_QUERY_INFO */ 41, /* SMB2_SET_INFO */ 33, /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */ }; static void smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ , const struct cifs_tcon *tcon) { struct smb2_pdu *pdu = (struct smb2_pdu *)hdr; char *temp = (char *)hdr; /* lookup word count ie StructureSize from table */ __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_cmd)]; /* * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of * largest operations (Create) */ memset(temp, 0, 256); /* Note this is only network field converted to big endian */ hdr->smb2_buf_length = cpu_to_be32(parmsize + sizeof(struct smb2_hdr) - 4 /* RFC 1001 length field itself not counted */); hdr->ProtocolId[0] = 0xFE; hdr->ProtocolId[1] = 'S'; hdr->ProtocolId[2] = 'M'; hdr->ProtocolId[3] = 'B'; hdr->StructureSize = cpu_to_le16(64); hdr->Command = smb2_cmd; hdr->CreditRequest = cpu_to_le16(2); /* BB make this dynamic */ hdr->ProcessId = cpu_to_le32((__u16)current->tgid); if (!tcon) goto out; hdr->TreeId = tcon->tid; /* Uid is not converted */ if (tcon->ses) hdr->SessionId = tcon->ses->Suid; /* BB check following DFS flags BB */ /* BB do we have to add check for SHI1005_FLAGS_DFS_ROOT too? */ if (tcon->share_flags & SHI1005_FLAGS_DFS) hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; /* BB how does SMB2 do case sensitive? */ /* if (tcon->nocase) hdr->Flags |= SMBFLG_CASELESS; */ if (tcon->ses && tcon->ses->server && (tcon->ses->server->sec_mode & SECMODE_SIGN_REQUIRED)) hdr->Flags |= SMB2_FLAGS_SIGNED; out: pdu->StructureSize2 = cpu_to_le16(parmsize); return; } static int smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon) { int rc = 0; struct nls_table *nls_codepage; struct cifs_ses *ses; struct TCP_Server_Info *server; /* * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so * check for tcp and smb session status done differently * for those three - in the calling routine. */ if (tcon == NULL) return rc; if (smb2_command == SMB2_TREE_CONNECT) return rc; if (tcon->tidStatus == CifsExiting) { /* * only tree disconnect, open, and write, * (and ulogoff which does not have tcon) * are allowed as we start force umount. */ if ((smb2_command != SMB2_WRITE) && (smb2_command != SMB2_CREATE) && (smb2_command != SMB2_TREE_DISCONNECT)) { cifs_dbg(FYI, "can not send cmd %d while umounting\n", smb2_command); return -ENODEV; } } if ((!tcon->ses) || (tcon->ses->status == CifsExiting) || (!tcon->ses->server)) return -EIO; ses = tcon->ses; server = ses->server; /* * Give demultiplex thread up to 10 seconds to reconnect, should be * greater than cifs socket timeout which is 7 seconds */ while (server->tcpStatus == CifsNeedReconnect) { /* * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE * here since they are implicitly done when session drops. */ switch (smb2_command) { /* * BB Should we keep oplock break and add flush to exceptions? */ case SMB2_TREE_DISCONNECT: case SMB2_CANCEL: case SMB2_CLOSE: case SMB2_OPLOCK_BREAK: return -EAGAIN; } wait_event_interruptible_timeout(server->response_q, (server->tcpStatus != CifsNeedReconnect), 10 * HZ); /* are we still trying to reconnect? */ if (server->tcpStatus != CifsNeedReconnect) break; /* * on "soft" mounts we wait once. Hard mounts keep * retrying until process is killed or server comes * back on-line */ if (!tcon->retry) { cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n"); return -EHOSTDOWN; } } if (!tcon->ses->need_reconnect && !tcon->need_reconnect) return rc; nls_codepage = load_nls_default(); /* * need to prevent multiple threads trying to simultaneously reconnect * the same SMB session */ mutex_lock(&tcon->ses->session_mutex); rc = cifs_negotiate_protocol(0, tcon->ses); if (!rc && tcon->ses->need_reconnect) rc = cifs_setup_session(0, tcon->ses, nls_codepage); if (rc || !tcon->need_reconnect) { mutex_unlock(&tcon->ses->session_mutex); goto out; } cifs_mark_open_files_invalid(tcon); rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage); mutex_unlock(&tcon->ses->session_mutex); cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc); if (rc) goto out; atomic_inc(&tconInfoReconnectCount); /* * BB FIXME add code to check if wsize needs update due to negotiated * smb buffer size shrinking. */ out: /* * Check if handle based operation so we know whether we can continue * or not without returning to caller to reset file handle. */ /* * BB Is flush done by server on drop of tcp session? Should we special * case it and skip above? */ switch (smb2_command) { case SMB2_FLUSH: case SMB2_READ: case SMB2_WRITE: case SMB2_LOCK: case SMB2_IOCTL: case SMB2_QUERY_DIRECTORY: case SMB2_CHANGE_NOTIFY: case SMB2_QUERY_INFO: case SMB2_SET_INFO: return -EAGAIN; } unload_nls(nls_codepage); return rc; } /* * Allocate and return pointer to an SMB request hdr, and set basic * SMB information in the SMB header. If the return code is zero, this * function must have filled in request_buf pointer. */ static int small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon, void **request_buf) { int rc = 0; rc = smb2_reconnect(smb2_command, tcon); if (rc) return rc; /* BB eventually switch this to SMB2 specific small buf size */ *request_buf = cifs_small_buf_get(); if (*request_buf == NULL) { /* BB should we add a retry in here if not a writepage? */ return -ENOMEM; } smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon); if (tcon != NULL) { #ifdef CONFIG_CIFS_STATS2 uint16_t com_code = le16_to_cpu(smb2_command); cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]); #endif cifs_stats_inc(&tcon->num_smbs_sent); } return rc; } static void free_rsp_buf(int resp_buftype, void *rsp) { if (resp_buftype == CIFS_SMALL_BUFFER) cifs_small_buf_release(rsp); else if (resp_buftype == CIFS_LARGE_BUFFER) cifs_buf_release(rsp); } /* * * SMB2 Worker functions follow: * * The general structure of the worker functions is: * 1) Call smb2_init (assembles SMB2 header) * 2) Initialize SMB2 command specific fields in fixed length area of SMB * 3) Call smb_sendrcv2 (sends request on socket and waits for response) * 4) Decode SMB2 command specific fields in the fixed length area * 5) Decode variable length data area (if any for this SMB2 command type) * 6) Call free smb buffer * 7) return * */ int SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses) { struct smb2_negotiate_req *req; struct smb2_negotiate_rsp *rsp; struct kvec iov[1]; int rc = 0; int resp_buftype; struct TCP_Server_Info *server; unsigned int sec_flags; u16 temp = 0; int blob_offset, blob_length; char *security_blob; int flags = CIFS_NEG_OP; cifs_dbg(FYI, "Negotiate protocol\n"); if (ses->server) server = ses->server; else { rc = -EIO; return rc; } rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req); if (rc) return rc; /* if any of auth flags (ie not sign or seal) are overriden use them */ if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL))) sec_flags = ses->overrideSecFlg; /* BB FIXME fix sign flags?*/ else /* if override flags set only sign/seal OR them with global auth */ sec_flags = global_secflags | ses->overrideSecFlg; cifs_dbg(FYI, "sec_flags 0x%x\n", sec_flags); req->hdr.SessionId = 0; req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id); req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */ inc_rfc1001_len(req, 2); /* only one of SMB2 signing flags may be set in SMB2 request */ if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) temp = SMB2_NEGOTIATE_SIGNING_REQUIRED; else if (sec_flags & CIFSSEC_MAY_SIGN) /* MAY_SIGN is a single flag */ temp = SMB2_NEGOTIATE_SIGNING_ENABLED; req->SecurityMode = cpu_to_le16(temp); req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities); memcpy(req->ClientGUID, cifs_client_guid, SMB2_CLIENT_GUID_SIZE); iov[0].iov_base = (char *)req; /* 4 for rfc1002 length field */ iov[0].iov_len = get_rfc1002_length(req) + 4; rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags); rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base; /* * No tcon so can't do * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]); */ if (rc != 0) goto neg_exit; cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode); /* BB we may eventually want to match the negotiated vs. requested dialect, even though we are only requesting one at a time */ if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) cifs_dbg(FYI, "negotiated smb2.0 dialect\n"); else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) cifs_dbg(FYI, "negotiated smb2.1 dialect\n"); else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID)) cifs_dbg(FYI, "negotiated smb3.0 dialect\n"); else { cifs_dbg(VFS, "Illegal dialect returned by server %d\n", le16_to_cpu(rsp->DialectRevision)); rc = -EIO; goto neg_exit; } server->dialect = le16_to_cpu(rsp->DialectRevision); server->maxBuf = le32_to_cpu(rsp->MaxTransactSize); server->max_read = le32_to_cpu(rsp->MaxReadSize); server->max_write = le32_to_cpu(rsp->MaxWriteSize); /* BB Do we need to validate the SecurityMode? */ server->sec_mode = le16_to_cpu(rsp->SecurityMode); server->capabilities = le32_to_cpu(rsp->Capabilities); /* Internal types */ server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES; security_blob = smb2_get_data_area_len(&blob_offset, &blob_length, &rsp->hdr); if (blob_length == 0) { cifs_dbg(VFS, "missing security blob on negprot\n"); rc = -EIO; goto neg_exit; } cifs_dbg(FYI, "sec_flags 0x%x\n", sec_flags); if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) { cifs_dbg(FYI, "Signing required\n"); if (!(server->sec_mode & (SMB2_NEGOTIATE_SIGNING_REQUIRED | SMB2_NEGOTIATE_SIGNING_ENABLED))) { cifs_dbg(VFS, "signing required but server lacks support\n"); rc = -EOPNOTSUPP; goto neg_exit; } server->sec_mode |= SECMODE_SIGN_REQUIRED; } else if (sec_flags & CIFSSEC_MAY_SIGN) { cifs_dbg(FYI, "Signing optional\n"); if (server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) { cifs_dbg(FYI, "Server requires signing\n"); server->sec_mode |= SECMODE_SIGN_REQUIRED; } else { server->sec_mode &= ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED); } } else { cifs_dbg(FYI, "Signing disabled\n"); if (server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) { cifs_dbg(VFS, "Server requires packet signing to be enabled in /proc/fs/cifs/SecurityFlags\n"); rc = -EOPNOTSUPP; goto neg_exit; } server->sec_mode &= ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED); } #ifdef CONFIG_SMB2_ASN1 /* BB REMOVEME when updated asn1.c ready */ rc = decode_neg_token_init(security_blob, blob_length, &server->sec_type); if (rc == 1) rc = 0; else if (rc == 0) { rc = -EIO; goto neg_exit; } #endif neg_exit: free_rsp_buf(resp_buftype, rsp); return rc; } int SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses, const struct nls_table *nls_cp) { struct smb2_sess_setup_req *req; struct smb2_sess_setup_rsp *rsp = NULL; struct kvec iov[2]; int rc = 0; int resp_buftype; __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */ struct TCP_Server_Info *server; unsigned int sec_flags; u8 temp = 0; u16 blob_length = 0; char *security_blob; char *ntlmssp_blob = NULL; bool use_spnego = false; /* else use raw ntlmssp */ cifs_dbg(FYI, "Session Setup\n"); if (ses->server) server = ses->server; else { rc = -EIO; return rc; } /* * If memory allocation is successful, caller of this function * frees it. */ ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL); if (!ses->ntlmssp) return -ENOMEM; ses->server->secType = RawNTLMSSP; ssetup_ntlmssp_authenticate: if (phase == NtLmChallenge) phase = NtLmAuthenticate; /* if ntlmssp, now final phase */ rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req); if (rc) return rc; /* if any of auth flags (ie not sign or seal) are overriden use them */ if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL))) sec_flags = ses->overrideSecFlg; /* BB FIXME fix sign flags?*/ else /* if override flags set only sign/seal OR them with global auth */ sec_flags = global_secflags | ses->overrideSecFlg; cifs_dbg(FYI, "sec_flags 0x%x\n", sec_flags); req->hdr.SessionId = 0; /* First session, not a reauthenticate */ req->VcNumber = 0; /* MBZ */ /* to enable echos and oplocks */ req->hdr.CreditRequest = cpu_to_le16(3); /* only one of SMB2 signing flags may be set in SMB2 request */ if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) temp = SMB2_NEGOTIATE_SIGNING_REQUIRED; else if (ses->server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) temp = SMB2_NEGOTIATE_SIGNING_REQUIRED; else if (sec_flags & CIFSSEC_MAY_SIGN) /* MAY_SIGN is a single flag */ temp = SMB2_NEGOTIATE_SIGNING_ENABLED; req->SecurityMode = temp; req->Capabilities = 0; req->Channel = 0; /* MBZ */ iov[0].iov_base = (char *)req; /* 4 for rfc1002 length field and 1 for pad */ iov[0].iov_len = get_rfc1002_length(req) + 4 - 1; if (phase == NtLmNegotiate) { ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE), GFP_KERNEL); if (ntlmssp_blob == NULL) { rc = -ENOMEM; goto ssetup_exit; } build_ntlmssp_negotiate_blob(ntlmssp_blob, ses); if (use_spnego) { /* blob_length = build_spnego_ntlmssp_blob( &security_blob, sizeof(struct _NEGOTIATE_MESSAGE), ntlmssp_blob); */ /* BB eventually need to add this */ cifs_dbg(VFS, "spnego not supported for SMB2 yet\n"); rc = -EOPNOTSUPP; kfree(ntlmssp_blob); goto ssetup_exit; } else { blob_length = sizeof(struct _NEGOTIATE_MESSAGE); /* with raw NTLMSSP we don't encapsulate in SPNEGO */ security_blob = ntlmssp_blob; } } else if (phase == NtLmAuthenticate) { req->hdr.SessionId = ses->Suid; ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500, GFP_KERNEL); if (ntlmssp_blob == NULL) { rc = -ENOMEM; goto ssetup_exit; } rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses, nls_cp); if (rc) { cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc); goto ssetup_exit; /* BB double check error handling */ } if (use_spnego) { /* blob_length = build_spnego_ntlmssp_blob( &security_blob, blob_length, ntlmssp_blob); */ cifs_dbg(VFS, "spnego not supported for SMB2 yet\n"); rc = -EOPNOTSUPP; kfree(ntlmssp_blob); goto ssetup_exit; } else { security_blob = ntlmssp_blob; } } else { cifs_dbg(VFS, "illegal ntlmssp phase\n"); rc = -EIO; goto ssetup_exit; } /* Testing shows that buffer offset must be at location of Buffer[0] */ req->SecurityBufferOffset = cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */ - 4 /* rfc1001 len */); req->SecurityBufferLength = cpu_to_le16(blob_length); iov[1].iov_base = security_blob; iov[1].iov_len = blob_length; inc_rfc1001_len(req, blob_length - 1 /* pad */); /* BB add code to build os and lm fields */ rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, CIFS_LOG_ERROR | CIFS_NEG_OP); kfree(security_blob); rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base; if (resp_buftype != CIFS_NO_BUFFER && rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) { if (phase != NtLmNegotiate) { cifs_dbg(VFS, "Unexpected more processing error\n"); goto ssetup_exit; } if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 != le16_to_cpu(rsp->SecurityBufferOffset)) { cifs_dbg(VFS, "Invalid security buffer offset %d\n", le16_to_cpu(rsp->SecurityBufferOffset)); rc = -EIO; goto ssetup_exit; } /* NTLMSSP Negotiate sent now processing challenge (response) */ phase = NtLmChallenge; /* process ntlmssp challenge */ rc = 0; /* MORE_PROCESSING is not an error here but expected */ ses->Suid = rsp->hdr.SessionId; rc = decode_ntlmssp_challenge(rsp->Buffer, le16_to_cpu(rsp->SecurityBufferLength), ses); } /* * BB eventually add code for SPNEGO decoding of NtlmChallenge blob, * but at least the raw NTLMSSP case works. */ /* * No tcon so can't do * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]); */ if (rc != 0) goto ssetup_exit; ses->session_flags = le16_to_cpu(rsp->SessionFlags); ssetup_exit: free_rsp_buf(resp_buftype, rsp); /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */ if ((phase == NtLmChallenge) && (rc == 0)) goto ssetup_ntlmssp_authenticate; return rc; } int SMB2_logoff(const unsigned int xid, struct cifs_ses *ses) { struct smb2_logoff_req *req; /* response is also trivial struct */ int rc = 0; struct TCP_Server_Info *server; cifs_dbg(FYI, "disconnect session %p\n", ses); if (ses && (ses->server)) server = ses->server; else return -EIO; rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req); if (rc) return rc; /* since no tcon, smb2_init can not do this, so do here */ req->hdr.SessionId = ses->Suid; if (server->sec_mode & SECMODE_SIGN_REQUIRED) req->hdr.Flags |= SMB2_FLAGS_SIGNED; rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0); /* * No tcon so can't do * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]); */ return rc; } static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code) { cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]); } #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */) int SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree, struct cifs_tcon *tcon, const struct nls_table *cp) { struct smb2_tree_connect_req *req; struct smb2_tree_connect_rsp *rsp = NULL; struct kvec iov[2]; int rc = 0; int resp_buftype; int unc_path_len; struct TCP_Server_Info *server; __le16 *unc_path = NULL; cifs_dbg(FYI, "TCON\n"); if ((ses->server) && tree) server = ses->server; else return -EIO; if (tcon && tcon->bad_network_name) return -ENOENT; unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL); if (unc_path == NULL) return -ENOMEM; unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1; unc_path_len *= 2; if (unc_path_len < 2) { kfree(unc_path); return -EINVAL; } rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req); if (rc) { kfree(unc_path); return rc; } if (tcon == NULL) { /* since no tcon, smb2_init can not do this, so do here */ req->hdr.SessionId = ses->Suid; /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED) req->hdr.Flags |= SMB2_FLAGS_SIGNED; */ } iov[0].iov_base = (char *)req; /* 4 for rfc1002 length field and 1 for pad */ iov[0].iov_len = get_rfc1002_length(req) + 4 - 1; /* Testing shows that buffer offset must be at location of Buffer[0] */ req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req) - 1 /* pad */ - 4 /* do not count rfc1001 len field */); req->PathLength = cpu_to_le16(unc_path_len - 2); iov[1].iov_base = unc_path; iov[1].iov_len = unc_path_len; inc_rfc1001_len(req, unc_path_len - 1 /* pad */); rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0); rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base; if (rc != 0) { if (tcon) { cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE); tcon->need_reconnect = true; } goto tcon_error_exit; } if (tcon == NULL) { ses->ipc_tid = rsp->hdr.TreeId; goto tcon_exit; } if (rsp->ShareType & SMB2_SHARE_TYPE_DISK) cifs_dbg(FYI, "connection to disk share\n"); else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) { tcon->ipc = true; cifs_dbg(FYI, "connection to pipe share\n"); } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) { tcon->print = true; cifs_dbg(FYI, "connection to printer\n"); } else { cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType); rc = -EOPNOTSUPP; goto tcon_error_exit; } tcon->share_flags = le32_to_cpu(rsp->ShareFlags); tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess); tcon->tidStatus = CifsGood; tcon->need_reconnect = false; tcon->tid = rsp->hdr.TreeId; strncpy(tcon->treeName, tree, MAX_TREE_SIZE); if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) && ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0)) cifs_dbg(VFS, "DFS capability contradicts DFS flag\n"); tcon_exit: free_rsp_buf(resp_buftype, rsp); kfree(unc_path); return rc; tcon_error_exit: if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) { cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree); tcon->bad_network_name = true; } goto tcon_exit; } int SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon) { struct smb2_tree_disconnect_req *req; /* response is trivial */ int rc = 0; struct TCP_Server_Info *server; struct cifs_ses *ses = tcon->ses; cifs_dbg(FYI, "Tree Disconnect\n"); if (ses && (ses->server)) server = ses->server; else return -EIO; if ((tcon->need_reconnect) || (tcon->ses->need_reconnect)) return 0; rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req); if (rc) return rc; rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0); if (rc) cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE); return rc; } static struct create_lease * create_lease_buf(u8 *lease_key, u8 oplock) { struct create_lease *buf; buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL); if (!buf) return NULL; buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key)); buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8))); if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE) buf->lcontext.LeaseState = SMB2_LEASE_WRITE_CACHING | SMB2_LEASE_READ_CACHING; else if (oplock == SMB2_OPLOCK_LEVEL_II) buf->lcontext.LeaseState = SMB2_LEASE_READ_CACHING; else if (oplock == SMB2_OPLOCK_LEVEL_BATCH) buf->lcontext.LeaseState = SMB2_LEASE_HANDLE_CACHING | SMB2_LEASE_READ_CACHING | SMB2_LEASE_WRITE_CACHING; buf->ccontext.DataOffset = cpu_to_le16(offsetof (struct create_lease, lcontext)); buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context)); buf->ccontext.NameOffset = cpu_to_le16(offsetof (struct create_lease, Name)); buf->ccontext.NameLength = cpu_to_le16(4); buf->Name[0] = 'R'; buf->Name[1] = 'q'; buf->Name[2] = 'L'; buf->Name[3] = 's'; return buf; } static __u8 parse_lease_state(struct smb2_create_rsp *rsp) { char *data_offset; struct create_lease *lc; bool found = false; data_offset = (char *)rsp; data_offset += 4 + le32_to_cpu(rsp->CreateContextsOffset); lc = (struct create_lease *)data_offset; do { char *name = le16_to_cpu(lc->ccontext.NameOffset) + (char *)lc; if (le16_to_cpu(lc->ccontext.NameLength) != 4 || strncmp(name, "RqLs", 4)) { lc = (struct create_lease *)((char *)lc + le32_to_cpu(lc->ccontext.Next)); continue; } if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS) return SMB2_OPLOCK_LEVEL_NOCHANGE; found = true; break; } while (le32_to_cpu(lc->ccontext.Next) != 0); if (!found) return 0; return smb2_map_lease_to_oplock(lc->lcontext.LeaseState); } int SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path, u64 *persistent_fid, u64 *volatile_fid, __u32 desired_access, __u32 create_disposition, __u32 file_attributes, __u32 create_options, __u8 *oplock, struct smb2_file_all_info *buf) { struct smb2_create_req *req; struct smb2_create_rsp *rsp; struct TCP_Server_Info *server; struct cifs_ses *ses = tcon->ses; struct kvec iov[3]; int resp_buftype; int uni_path_len; __le16 *copy_path = NULL; int copy_size; int rc = 0; int num_iovecs = 2; cifs_dbg(FYI, "create/open\n"); if (ses && (ses->server)) server = ses->server; else return -EIO; rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req); if (rc) return rc; req->ImpersonationLevel = IL_IMPERSONATION; req->DesiredAccess = cpu_to_le32(desired_access); /* File attributes ignored on open (used in create though) */ req->FileAttributes = cpu_to_le32(file_attributes); req->ShareAccess = FILE_SHARE_ALL_LE; req->CreateDisposition = cpu_to_le32(create_disposition); req->CreateOptions = cpu_to_le32(create_options); uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2; req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 8 /* pad */ - 4 /* do not count rfc1001 len field */); iov[0].iov_base = (char *)req; /* 4 for rfc1002 length field */ iov[0].iov_len = get_rfc1002_length(req) + 4; /* MUST set path len (NameLength) to 0 opening root of share */ if (uni_path_len >= 4) { req->NameLength = cpu_to_le16(uni_path_len - 2); /* -1 since last byte is buf[0] which is sent below (path) */ iov[0].iov_len--; if (uni_path_len % 8 != 0) { copy_size = uni_path_len / 8 * 8; if (copy_size < uni_path_len) copy_size += 8; copy_path = kzalloc(copy_size, GFP_KERNEL); if (!copy_path) return -ENOMEM; memcpy((char *)copy_path, (const char *)path, uni_path_len); uni_path_len = copy_size; path = copy_path; } iov[1].iov_len = uni_path_len; iov[1].iov_base = path; /* * -1 since last byte is buf[0] which was counted in * smb2_buf_len. */ inc_rfc1001_len(req, uni_path_len - 1); } else { iov[0].iov_len += 7; req->hdr.smb2_buf_length = cpu_to_be32(be32_to_cpu( req->hdr.smb2_buf_length) + 8 - 1); num_iovecs = 1; req->NameLength = 0; } if (!server->oplocks) *oplock = SMB2_OPLOCK_LEVEL_NONE; if (!(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING) || *oplock == SMB2_OPLOCK_LEVEL_NONE) req->RequestedOplockLevel = *oplock; else { iov[num_iovecs].iov_base = create_lease_buf(oplock+1, *oplock); if (iov[num_iovecs].iov_base == NULL) { cifs_small_buf_release(req); kfree(copy_path); return -ENOMEM; } iov[num_iovecs].iov_len = sizeof(struct create_lease); req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE; req->CreateContextsOffset = cpu_to_le32( sizeof(struct smb2_create_req) - 4 - 8 + iov[num_iovecs-1].iov_len); req->CreateContextsLength = cpu_to_le32( sizeof(struct create_lease)); inc_rfc1001_len(&req->hdr, sizeof(struct create_lease)); num_iovecs++; } rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0); rsp = (struct smb2_create_rsp *)iov[0].iov_base; if (rc != 0) { cifs_stats_fail_inc(tcon, SMB2_CREATE_HE); goto creat_exit; } *persistent_fid = rsp->PersistentFileId; *volatile_fid = rsp->VolatileFileId; if (buf) { memcpy(buf, &rsp->CreationTime, 32); buf->AllocationSize = rsp->AllocationSize; buf->EndOfFile = rsp->EndofFile; buf->Attributes = rsp->FileAttributes; buf->NumberOfLinks = cpu_to_le32(1); buf->DeletePending = 0; } if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE) *oplock = parse_lease_state(rsp); else *oplock = rsp->OplockLevel; creat_exit: kfree(copy_path); free_rsp_buf(resp_buftype, rsp); return rc; } int SMB2_close(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid) { struct smb2_close_req *req; struct smb2_close_rsp *rsp; struct TCP_Server_Info *server; struct cifs_ses *ses = tcon->ses; struct kvec iov[1]; int resp_buftype; int rc = 0; cifs_dbg(FYI, "Close\n"); if (ses && (ses->server)) server = ses->server; else return -EIO; rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req); if (rc) return rc; req->PersistentFileId = persistent_fid; req->VolatileFileId = volatile_fid; iov[0].iov_base = (char *)req; /* 4 for rfc1002 length field */ iov[0].iov_len = get_rfc1002_length(req) + 4; rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0); rsp = (struct smb2_close_rsp *)iov[0].iov_base; if (rc != 0) { if (tcon) cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE); goto close_exit; } /* BB FIXME - decode close response, update inode for caching */ close_exit: free_rsp_buf(resp_buftype, rsp); return rc; } static int validate_buf(unsigned int offset, unsigned int buffer_length, struct smb2_hdr *hdr, unsigned int min_buf_size) { unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length); char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr; char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr; char *end_of_buf = begin_of_buf + buffer_length; if (buffer_length < min_buf_size) { cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n", buffer_length, min_buf_size); return -EINVAL; } /* check if beyond RFC1001 maximum length */ if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) { cifs_dbg(VFS, "buffer length %d or smb length %d too large\n", buffer_length, smb_len); return -EINVAL; } if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) { cifs_dbg(VFS, "illegal server response, bad offset to data\n"); return -EINVAL; } return 0; } /* * If SMB buffer fields are valid, copy into temporary buffer to hold result. * Caller must free buffer. */ static int validate_and_copy_buf(unsigned int offset, unsigned int buffer_length, struct smb2_hdr *hdr, unsigned int minbufsize, char *data) { char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr; int rc; if (!data) return -EINVAL; rc = validate_buf(offset, buffer_length, hdr, minbufsize); if (rc) return rc; memcpy(data, begin_of_buf, buffer_length); return 0; } static int query_info(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, u8 info_class, size_t output_len, size_t min_len, void *data) { struct smb2_query_info_req *req; struct smb2_query_info_rsp *rsp = NULL; struct kvec iov[2]; int rc = 0; int resp_buftype; struct TCP_Server_Info *server; struct cifs_ses *ses = tcon->ses; cifs_dbg(FYI, "Query Info\n"); if (ses && (ses->server)) server = ses->server; else return -EIO; rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req); if (rc) return rc; req->InfoType = SMB2_O_INFO_FILE; req->FileInfoClass = info_class; req->PersistentFileId = persistent_fid; req->VolatileFileId = volatile_fid; /* 4 for rfc1002 length field and 1 for Buffer */ req->InputBufferOffset = cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4); req->OutputBufferLength = cpu_to_le32(output_len); iov[0].iov_base = (char *)req; /* 4 for rfc1002 length field */ iov[0].iov_len = get_rfc1002_length(req) + 4; rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0); rsp = (struct smb2_query_info_rsp *)iov[0].iov_base; if (rc) { cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE); goto qinf_exit; } rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset), le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr, min_len, data); qinf_exit: free_rsp_buf(resp_buftype, rsp); return rc; } int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data) { return query_info(xid, tcon, persistent_fid, volatile_fid, FILE_ALL_INFORMATION, sizeof(struct smb2_file_all_info) + MAX_NAME * 2, sizeof(struct smb2_file_all_info), data); } int SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid) { return query_info(xid, tcon, persistent_fid, volatile_fid, FILE_INTERNAL_INFORMATION, sizeof(struct smb2_file_internal_info), sizeof(struct smb2_file_internal_info), uniqueid); } /* * This is a no-op for now. We're not really interested in the reply, but * rather in the fact that the server sent one and that server->lstrp * gets updated. * * FIXME: maybe we should consider checking that the reply matches request? */ static void smb2_echo_callback(struct mid_q_entry *mid) { struct TCP_Server_Info *server = mid->callback_data; struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf; unsigned int credits_received = 1; if (mid->mid_state == MID_RESPONSE_RECEIVED) credits_received = le16_to_cpu(smb2->hdr.CreditRequest); DeleteMidQEntry(mid); add_credits(server, credits_received, CIFS_ECHO_OP); } int SMB2_echo(struct TCP_Server_Info *server) { struct smb2_echo_req *req; int rc = 0; struct kvec iov; struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; cifs_dbg(FYI, "In echo request\n"); rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req); if (rc) return rc; req->hdr.CreditRequest = cpu_to_le16(1); iov.iov_base = (char *)req; /* 4 for rfc1002 length field */ iov.iov_len = get_rfc1002_length(req) + 4; rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server, CIFS_ECHO_OP); if (rc) cifs_dbg(FYI, "Echo request failed: %d\n", rc); cifs_small_buf_release(req); return rc; } int SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid) { struct smb2_flush_req *req; struct TCP_Server_Info *server; struct cifs_ses *ses = tcon->ses; struct kvec iov[1]; int resp_buftype; int rc = 0; cifs_dbg(FYI, "Flush\n"); if (ses && (ses->server)) server = ses->server; else return -EIO; rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req); if (rc) return rc; req->PersistentFileId = persistent_fid; req->VolatileFileId = volatile_fid; iov[0].iov_base = (char *)req; /* 4 for rfc1002 length field */ iov[0].iov_len = get_rfc1002_length(req) + 4; rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0); if ((rc != 0) && tcon) cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE); free_rsp_buf(resp_buftype, iov[0].iov_base); return rc; } /* * To form a chain of read requests, any read requests after the first should * have the end_of_chain boolean set to true. */ static int smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms, unsigned int remaining_bytes, int request_type) { int rc = -EACCES; struct smb2_read_req *req = NULL; rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req); if (rc) return rc; if (io_parms->tcon->ses->server == NULL) return -ECONNABORTED; req->hdr.ProcessId = cpu_to_le32(io_parms->pid); req->PersistentFileId = io_parms->persistent_fid; req->VolatileFileId = io_parms->volatile_fid; req->ReadChannelInfoOffset = 0; /* reserved */ req->ReadChannelInfoLength = 0; /* reserved */ req->Channel = 0; /* reserved */ req->MinimumCount = 0; req->Length = cpu_to_le32(io_parms->length); req->Offset = cpu_to_le64(io_parms->offset); if (request_type & CHAINED_REQUEST) { if (!(request_type & END_OF_CHAIN)) { /* 4 for rfc1002 length field */ req->hdr.NextCommand = cpu_to_le32(get_rfc1002_length(req) + 4); } else /* END_OF_CHAIN */ req->hdr.NextCommand = 0; if (request_type & RELATED_REQUEST) { req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS; /* * Related requests use info from previous read request * in chain. */ req->hdr.SessionId = 0xFFFFFFFF; req->hdr.TreeId = 0xFFFFFFFF; req->PersistentFileId = 0xFFFFFFFF; req->VolatileFileId = 0xFFFFFFFF; } } if (remaining_bytes > io_parms->length) req->RemainingBytes = cpu_to_le32(remaining_bytes); else req->RemainingBytes = 0; iov[0].iov_base = (char *)req; /* 4 for rfc1002 length field */ iov[0].iov_len = get_rfc1002_length(req) + 4; return rc; } static void smb2_readv_callback(struct mid_q_entry *mid) { struct cifs_readdata *rdata = mid->callback_data; struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink); struct TCP_Server_Info *server = tcon->ses->server; struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base; unsigned int credits_received = 1; struct smb_rqst rqst = { .rq_iov = &rdata->iov, .rq_nvec = 1, .rq_pages = rdata->pages, .rq_npages = rdata->nr_pages, .rq_pagesz = rdata->pagesz, .rq_tailsz = rdata->tailsz }; cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n", __func__, mid->mid, mid->mid_state, rdata->result, rdata->bytes); switch (mid->mid_state) { case MID_RESPONSE_RECEIVED: credits_received = le16_to_cpu(buf->CreditRequest); /* result already set, check signature */ if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { int rc; rc = smb2_verify_signature(&rqst, server); if (rc) cifs_dbg(VFS, "SMB signature verification returned error = %d\n", rc); } /* FIXME: should this be counted toward the initiating task? */ task_io_account_read(rdata->bytes); cifs_stats_bytes_read(tcon, rdata->bytes); break; case MID_REQUEST_SUBMITTED: case MID_RETRY_NEEDED: rdata->result = -EAGAIN; break; default: if (rdata->result != -ENODATA) rdata->result = -EIO; } if (rdata->result) cifs_stats_fail_inc(tcon, SMB2_READ_HE); queue_work(cifsiod_wq, &rdata->work); DeleteMidQEntry(mid); add_credits(server, credits_received, 0); } /* smb2_async_readv - send an async write, and set up mid to handle result */ int smb2_async_readv(struct cifs_readdata *rdata) { int rc; struct smb2_hdr *buf; struct cifs_io_parms io_parms; struct smb_rqst rqst = { .rq_iov = &rdata->iov, .rq_nvec = 1 }; cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n", __func__, rdata->offset, rdata->bytes); io_parms.tcon = tlink_tcon(rdata->cfile->tlink); io_parms.offset = rdata->offset; io_parms.length = rdata->bytes; io_parms.persistent_fid = rdata->cfile->fid.persistent_fid; io_parms.volatile_fid = rdata->cfile->fid.volatile_fid; io_parms.pid = rdata->pid; rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0); if (rc) return rc; buf = (struct smb2_hdr *)rdata->iov.iov_base; /* 4 for rfc1002 length field */ rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4; kref_get(&rdata->refcount); rc = cifs_call_async(io_parms.tcon->ses->server, &rqst, cifs_readv_receive, smb2_readv_callback, rdata, 0); if (rc) { kref_put(&rdata->refcount, cifs_readdata_release); cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE); } cifs_small_buf_release(buf); return rc; } int SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms, unsigned int *nbytes, char **buf, int *buf_type) { int resp_buftype, rc = -EACCES; struct smb2_read_rsp *rsp = NULL; struct kvec iov[1]; *nbytes = 0; rc = smb2_new_read_req(iov, io_parms, 0, 0); if (rc) return rc; rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1, &resp_buftype, CIFS_LOG_ERROR); rsp = (struct smb2_read_rsp *)iov[0].iov_base; if (rsp->hdr.Status == STATUS_END_OF_FILE) { free_rsp_buf(resp_buftype, iov[0].iov_base); return 0; } if (rc) { cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE); cifs_dbg(VFS, "Send error in read = %d\n", rc); } else { *nbytes = le32_to_cpu(rsp->DataLength); if ((*nbytes > CIFS_MAX_MSGSIZE) || (*nbytes > io_parms->length)) { cifs_dbg(FYI, "bad length %d for count %d\n", *nbytes, io_parms->length); rc = -EIO; *nbytes = 0; } } if (*buf) { memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset, *nbytes); free_rsp_buf(resp_buftype, iov[0].iov_base); } else if (resp_buftype != CIFS_NO_BUFFER) { *buf = iov[0].iov_base; if (resp_buftype == CIFS_SMALL_BUFFER) *buf_type = CIFS_SMALL_BUFFER; else if (resp_buftype == CIFS_LARGE_BUFFER) *buf_type = CIFS_LARGE_BUFFER; } return rc; } /* * Check the mid_state and signature on received buffer (if any), and queue the * workqueue completion task. */ static void smb2_writev_callback(struct mid_q_entry *mid) { struct cifs_writedata *wdata = mid->callback_data; struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink); unsigned int written; struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf; unsigned int credits_received = 1; switch (mid->mid_state) { case MID_RESPONSE_RECEIVED: credits_received = le16_to_cpu(rsp->hdr.CreditRequest); wdata->result = smb2_check_receive(mid, tcon->ses->server, 0); if (wdata->result != 0) break; written = le32_to_cpu(rsp->DataLength); /* * Mask off high 16 bits when bytes written as returned * by the server is greater than bytes requested by the * client. OS/2 servers are known to set incorrect * CountHigh values. */ if (written > wdata->bytes) written &= 0xFFFF; if (written < wdata->bytes) wdata->result = -ENOSPC; else wdata->bytes = written; break; case MID_REQUEST_SUBMITTED: case MID_RETRY_NEEDED: wdata->result = -EAGAIN; break; default: wdata->result = -EIO; break; } if (wdata->result) cifs_stats_fail_inc(tcon, SMB2_WRITE_HE); queue_work(cifsiod_wq, &wdata->work); DeleteMidQEntry(mid); add_credits(tcon->ses->server, credits_received, 0); } /* smb2_async_writev - send an async write, and set up mid to handle result */ int smb2_async_writev(struct cifs_writedata *wdata) { int rc = -EACCES; struct smb2_write_req *req = NULL; struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink); struct kvec iov; struct smb_rqst rqst; rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req); if (rc) goto async_writev_out; req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid); req->PersistentFileId = wdata->cfile->fid.persistent_fid; req->VolatileFileId = wdata->cfile->fid.volatile_fid; req->WriteChannelInfoOffset = 0; req->WriteChannelInfoLength = 0; req->Channel = 0; req->Offset = cpu_to_le64(wdata->offset); /* 4 for rfc1002 length field */ req->DataOffset = cpu_to_le16( offsetof(struct smb2_write_req, Buffer) - 4); req->RemainingBytes = 0; /* 4 for rfc1002 length field and 1 for Buffer */ iov.iov_len = get_rfc1002_length(req) + 4 - 1; iov.iov_base = req; rqst.rq_iov = &iov; rqst.rq_nvec = 1; rqst.rq_pages = wdata->pages; rqst.rq_npages = wdata->nr_pages; rqst.rq_pagesz = wdata->pagesz; rqst.rq_tailsz = wdata->tailsz; cifs_dbg(FYI, "async write at %llu %u bytes\n", wdata->offset, wdata->bytes); req->Length = cpu_to_le32(wdata->bytes); inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */); kref_get(&wdata->refcount); rc = cifs_call_async(tcon->ses->server, &rqst, NULL, smb2_writev_callback, wdata, 0); if (rc) { kref_put(&wdata->refcount, cifs_writedata_release); cifs_stats_fail_inc(tcon, SMB2_WRITE_HE); } async_writev_out: cifs_small_buf_release(req); return rc; } /* * SMB2_write function gets iov pointer to kvec array with n_vec as a length. * The length field from io_parms must be at least 1 and indicates a number of * elements with data to write that begins with position 1 in iov array. All * data length is specified by count. */ int SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms, unsigned int *nbytes, struct kvec *iov, int n_vec) { int rc = 0; struct smb2_write_req *req = NULL; struct smb2_write_rsp *rsp = NULL; int resp_buftype; *nbytes = 0; if (n_vec < 1) return rc; rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req); if (rc) return rc; if (io_parms->tcon->ses->server == NULL) return -ECONNABORTED; req->hdr.ProcessId = cpu_to_le32(io_parms->pid); req->PersistentFileId = io_parms->persistent_fid; req->VolatileFileId = io_parms->volatile_fid; req->WriteChannelInfoOffset = 0; req->WriteChannelInfoLength = 0; req->Channel = 0; req->Length = cpu_to_le32(io_parms->length); req->Offset = cpu_to_le64(io_parms->offset); /* 4 for rfc1002 length field */ req->DataOffset = cpu_to_le16( offsetof(struct smb2_write_req, Buffer) - 4); req->RemainingBytes = 0; iov[0].iov_base = (char *)req; /* 4 for rfc1002 length field and 1 for Buffer */ iov[0].iov_len = get_rfc1002_length(req) + 4 - 1; /* length of entire message including data to be written */ inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */); rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1, &resp_buftype, 0); rsp = (struct smb2_write_rsp *)iov[0].iov_base; if (rc) { cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE); cifs_dbg(VFS, "Send error in write = %d\n", rc); } else *nbytes = le32_to_cpu(rsp->DataLength); free_rsp_buf(resp_buftype, rsp); return rc; } static unsigned int num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size) { int len; unsigned int entrycount = 0; unsigned int next_offset = 0; FILE_DIRECTORY_INFO *entryptr; if (bufstart == NULL) return 0; entryptr = (FILE_DIRECTORY_INFO *)bufstart; while (1) { entryptr = (FILE_DIRECTORY_INFO *) ((char *)entryptr + next_offset); if ((char *)entryptr + size > end_of_buf) { cifs_dbg(VFS, "malformed search entry would overflow\n"); break; } len = le32_to_cpu(entryptr->FileNameLength); if ((char *)entryptr + len + size > end_of_buf) { cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n", end_of_buf); break; } *lastentry = (char *)entryptr; entrycount++; next_offset = le32_to_cpu(entryptr->NextEntryOffset); if (!next_offset) break; } return entrycount; } /* * Readdir/FindFirst */ int SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, int index, struct cifs_search_info *srch_inf) { struct smb2_query_directory_req *req; struct smb2_query_directory_rsp *rsp = NULL; struct kvec iov[2]; int rc = 0; int len; int resp_buftype; unsigned char *bufptr; struct TCP_Server_Info *server; struct cifs_ses *ses = tcon->ses; __le16 asteriks = cpu_to_le16('*'); char *end_of_smb; unsigned int output_size = CIFSMaxBufSize; size_t info_buf_size; if (ses && (ses->server)) server = ses->server; else return -EIO; rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req); if (rc) return rc; switch (srch_inf->info_level) { case SMB_FIND_FILE_DIRECTORY_INFO: req->FileInformationClass = FILE_DIRECTORY_INFORMATION; info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1; break; case SMB_FIND_FILE_ID_FULL_DIR_INFO: req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION; info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1; break; default: cifs_dbg(VFS, "info level %u isn't supported\n", srch_inf->info_level); rc = -EINVAL; goto qdir_exit; } req->FileIndex = cpu_to_le32(index); req->PersistentFileId = persistent_fid; req->VolatileFileId = volatile_fid; len = 0x2; bufptr = req->Buffer; memcpy(bufptr, &asteriks, len); req->FileNameOffset = cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4); req->FileNameLength = cpu_to_le16(len); /* * BB could be 30 bytes or so longer if we used SMB2 specific * buffer lengths, but this is safe and close enough. */ output_size = min_t(unsigned int, output_size, server->maxBuf); output_size = min_t(unsigned int, output_size, 2 << 15); req->OutputBufferLength = cpu_to_le32(output_size); iov[0].iov_base = (char *)req; /* 4 for RFC1001 length and 1 for Buffer */ iov[0].iov_len = get_rfc1002_length(req) + 4 - 1; iov[1].iov_base = (char *)(req->Buffer); iov[1].iov_len = len; inc_rfc1001_len(req, len - 1 /* Buffer */); rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0); rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base; if (rc) { cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE); goto qdir_exit; } rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset), le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr, info_buf_size); if (rc) goto qdir_exit; srch_inf->unicode = true; if (srch_inf->ntwrk_buf_start) { if (srch_inf->smallBuf) cifs_small_buf_release(srch_inf->ntwrk_buf_start); else cifs_buf_release(srch_inf->ntwrk_buf_start); } srch_inf->ntwrk_buf_start = (char *)rsp; srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ + (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset); /* 4 for rfc1002 length field */ end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr; srch_inf->entries_in_buffer = num_entries(srch_inf->srch_entries_start, end_of_smb, &srch_inf->last_entry, info_buf_size); srch_inf->index_of_last_entry += srch_inf->entries_in_buffer; cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n", srch_inf->entries_in_buffer, srch_inf->index_of_last_entry, srch_inf->srch_entries_start, srch_inf->last_entry); if (resp_buftype == CIFS_LARGE_BUFFER) srch_inf->smallBuf = false; else if (resp_buftype == CIFS_SMALL_BUFFER) srch_inf->smallBuf = true; else cifs_dbg(VFS, "illegal search buffer type\n"); if (rsp->hdr.Status == STATUS_NO_MORE_FILES) srch_inf->endOfSearch = 1; else srch_inf->endOfSearch = 0; return rc; qdir_exit: free_rsp_buf(resp_buftype, rsp); return rc; } static int send_set_info(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class, unsigned int num, void **data, unsigned int *size) { struct smb2_set_info_req *req; struct smb2_set_info_rsp *rsp = NULL; struct kvec *iov; int rc = 0; int resp_buftype; unsigned int i; struct TCP_Server_Info *server; struct cifs_ses *ses = tcon->ses; if (ses && (ses->server)) server = ses->server; else return -EIO; if (!num) return -EINVAL; iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL); if (!iov) return -ENOMEM; rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req); if (rc) { kfree(iov); return rc; } req->hdr.ProcessId = cpu_to_le32(pid); req->InfoType = SMB2_O_INFO_FILE; req->FileInfoClass = info_class; req->PersistentFileId = persistent_fid; req->VolatileFileId = volatile_fid; /* 4 for RFC1001 length and 1 for Buffer */ req->BufferOffset = cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4); req->BufferLength = cpu_to_le32(*size); inc_rfc1001_len(req, *size - 1 /* Buffer */); memcpy(req->Buffer, *data, *size); iov[0].iov_base = (char *)req; /* 4 for RFC1001 length */ iov[0].iov_len = get_rfc1002_length(req) + 4; for (i = 1; i < num; i++) { inc_rfc1001_len(req, size[i]); le32_add_cpu(&req->BufferLength, size[i]); iov[i].iov_base = (char *)data[i]; iov[i].iov_len = size[i]; } rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0); rsp = (struct smb2_set_info_rsp *)iov[0].iov_base; if (rc != 0) { cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE); goto out; } out: free_rsp_buf(resp_buftype, rsp); kfree(iov); return rc; } int SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, __le16 *target_file) { struct smb2_file_rename_info info; void **data; unsigned int size[2]; int rc; int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX)); data = kmalloc(sizeof(void *) * 2, GFP_KERNEL); if (!data) return -ENOMEM; info.ReplaceIfExists = 1; /* 1 = replace existing target with new */ /* 0 = fail if target already exists */ info.RootDirectory = 0; /* MBZ for network ops (why does spec say?) */ info.FileNameLength = cpu_to_le32(len); data[0] = &info; size[0] = sizeof(struct smb2_file_rename_info); data[1] = target_file; size[1] = len + 2 /* null */; rc = send_set_info(xid, tcon, persistent_fid, volatile_fid, current->tgid, FILE_RENAME_INFORMATION, 2, data, size); kfree(data); return rc; } int SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, __le16 *target_file) { struct smb2_file_link_info info; void **data; unsigned int size[2]; int rc; int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX)); data = kmalloc(sizeof(void *) * 2, GFP_KERNEL); if (!data) return -ENOMEM; info.ReplaceIfExists = 0; /* 1 = replace existing link with new */ /* 0 = fail if link already exists */ info.RootDirectory = 0; /* MBZ for network ops (why does spec say?) */ info.FileNameLength = cpu_to_le32(len); data[0] = &info; size[0] = sizeof(struct smb2_file_link_info); data[1] = target_file; size[1] = len + 2 /* null */; rc = send_set_info(xid, tcon, persistent_fid, volatile_fid, current->tgid, FILE_LINK_INFORMATION, 2, data, size); kfree(data); return rc; } int SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, u32 pid, __le64 *eof) { struct smb2_file_eof_info info; void *data; unsigned int size; info.EndOfFile = *eof; data = &info; size = sizeof(struct smb2_file_eof_info); return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid, FILE_END_OF_FILE_INFORMATION, 1, &data, &size); } int SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf) { unsigned int size; size = sizeof(FILE_BASIC_INFO); return send_set_info(xid, tcon, persistent_fid, volatile_fid, current->tgid, FILE_BASIC_INFORMATION, 1, (void **)&buf, &size); } int SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon, const u64 persistent_fid, const u64 volatile_fid, __u8 oplock_level) { int rc; struct smb2_oplock_break *req = NULL; cifs_dbg(FYI, "SMB2_oplock_break\n"); rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req); if (rc) return rc; req->VolatileFid = volatile_fid; req->PersistentFid = persistent_fid; req->OplockLevel = oplock_level; req->hdr.CreditRequest = cpu_to_le16(1); rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP); /* SMB2 buffer freed by function above */ if (rc) { cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE); cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc); } return rc; } static void copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf, struct kstatfs *kst) { kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) * le32_to_cpu(pfs_inf->SectorsPerAllocationUnit); kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits); kst->f_bfree = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits); kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits); return; } static int build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level, int outbuf_len, u64 persistent_fid, u64 volatile_fid) { int rc; struct smb2_query_info_req *req; cifs_dbg(FYI, "Query FSInfo level %d\n", level); if ((tcon->ses == NULL) || (tcon->ses->server == NULL)) return -EIO; rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req); if (rc) return rc; req->InfoType = SMB2_O_INFO_FILESYSTEM; req->FileInfoClass = level; req->PersistentFileId = persistent_fid; req->VolatileFileId = volatile_fid; /* 4 for rfc1002 length field and 1 for pad */ req->InputBufferOffset = cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4); req->OutputBufferLength = cpu_to_le32( outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4); iov->iov_base = (char *)req; /* 4 for rfc1002 length field */ iov->iov_len = get_rfc1002_length(req) + 4; return 0; } int SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata) { struct smb2_query_info_rsp *rsp = NULL; struct kvec iov; int rc = 0; int resp_buftype; struct cifs_ses *ses = tcon->ses; struct smb2_fs_full_size_info *info = NULL; rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION, sizeof(struct smb2_fs_full_size_info), persistent_fid, volatile_fid); if (rc) return rc; rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0); if (rc) { cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE); goto qinf_exit; } rsp = (struct smb2_query_info_rsp *)iov.iov_base; info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ + le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr); rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset), le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr, sizeof(struct smb2_fs_full_size_info)); if (!rc) copy_fs_info_to_kstatfs(info, fsdata); qinf_exit: free_rsp_buf(resp_buftype, iov.iov_base); return rc; } int smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon, const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid, const __u32 num_lock, struct smb2_lock_element *buf) { int rc = 0; struct smb2_lock_req *req = NULL; struct kvec iov[2]; int resp_buf_type; unsigned int count; cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock); rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req); if (rc) return rc; req->hdr.ProcessId = cpu_to_le32(pid); req->LockCount = cpu_to_le16(num_lock); req->PersistentFileId = persist_fid; req->VolatileFileId = volatile_fid; count = num_lock * sizeof(struct smb2_lock_element); inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element)); iov[0].iov_base = (char *)req; /* 4 for rfc1002 length field and count for all locks */ iov[0].iov_len = get_rfc1002_length(req) + 4 - count; iov[1].iov_base = (char *)buf; iov[1].iov_len = count; cifs_stats_inc(&tcon->stats.cifs_stats.num_locks); rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP); if (rc) { cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc); cifs_stats_fail_inc(tcon, SMB2_LOCK_HE); } return rc; } int SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon, const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid, const __u64 length, const __u64 offset, const __u32 lock_flags, const bool wait) { struct smb2_lock_element lock; lock.Offset = cpu_to_le64(offset); lock.Length = cpu_to_le64(length); lock.Flags = cpu_to_le32(lock_flags); if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK) lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY); return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock); } int SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon, __u8 *lease_key, const __le32 lease_state) { int rc; struct smb2_lease_ack *req = NULL; cifs_dbg(FYI, "SMB2_lease_break\n"); rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req); if (rc) return rc; req->hdr.CreditRequest = cpu_to_le16(1); req->StructureSize = cpu_to_le16(36); inc_rfc1001_len(req, 12); memcpy(req->LeaseKey, lease_key, 16); req->LeaseState = lease_state; rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP); /* SMB2 buffer freed by function above */ if (rc) { cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE); cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc); } return rc; }