/* * fs/cifs/smb2pdu.c * * Copyright (C) International Business Machines Corp., 2009, 2011 * 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 <linux/fs.h> #include <linux/kernel.h> #include <linux/vfs.h> #include <linux/uaccess.h> #include <linux/xattr.h> #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" /* * 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)) { cFYI(1, "can not send cmd %d while umounting", 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) { cFYI(1, "gave up waiting on reconnect in smb_init"); 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); cFYI(1, "reconnect tcon rc = %d", 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); } #define SMB2_NUM_PROT 1 #define SMB2_PROT 0 #define SMB21_PROT 1 #define BAD_PROT 0xFFFF #define SMB2_PROT_ID 0x0202 #define SMB21_PROT_ID 0x0210 #define BAD_PROT_ID 0xFFFF static struct { int index; __le16 name; } smb2protocols[] = { {SMB2_PROT, cpu_to_le16(SMB2_PROT_ID)}, {SMB21_PROT, cpu_to_le16(SMB21_PROT_ID)}, {BAD_PROT, cpu_to_le16(BAD_PROT_ID)} }; /* * * 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 i; u16 temp = 0; int blob_offset, blob_length; char *security_blob; int flags = CIFS_NEG_OP; cFYI(1, "Negotiate protocol"); 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; cFYI(1, "sec_flags 0x%x", sec_flags); req->hdr.SessionId = 0; for (i = 0; i < SMB2_NUM_PROT; i++) req->Dialects[i] = smb2protocols[i].name; req->DialectCount = cpu_to_le16(i); inc_rfc1001_len(req, i * 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(SMB2_GLOBAL_CAP_DFS); 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; if (rsp == NULL) { rc = -EIO; goto neg_exit; } cFYI(1, "mode 0x%x", rsp->SecurityMode); if (rsp->DialectRevision == smb2protocols[SMB21_PROT].name) cFYI(1, "negotiated smb2.1 dialect"); else if (rsp->DialectRevision == smb2protocols[SMB2_PROT].name) cFYI(1, "negotiated smb2 dialect"); else { cERROR(1, "Illegal dialect returned by server %d", 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) { cERROR(1, "missing security blob on negprot"); rc = -EIO; goto neg_exit; } #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 */ cFYI(1, "Session Setup"); 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; cFYI(1, "sec_flags 0x%x", 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 */ cERROR(1, "spnego not supported for SMB2 yet"); 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) { cERROR(1, "failed to malloc ntlmssp blob"); rc = -ENOMEM; goto ssetup_exit; } rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses, nls_cp); if (rc) { cFYI(1, "build_ntlmssp_auth_blob failed %d", rc); goto ssetup_exit; /* BB double check error handling */ } if (use_spnego) { /* blob_length = build_spnego_ntlmssp_blob( &security_blob, blob_length, ntlmssp_blob); */ cERROR(1, "spnego not supported for SMB2 yet"); rc = -EOPNOTSUPP; kfree(ntlmssp_blob); goto ssetup_exit; } else { security_blob = ntlmssp_blob; } } else { cERROR(1, "illegal ntlmssp phase"); 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); kfree(security_blob); rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base; if (rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) { if (phase != NtLmNegotiate) { cERROR(1, "Unexpected more processing error"); goto ssetup_exit; } if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 != le16_to_cpu(rsp->SecurityBufferOffset)) { cERROR(1, "Invalid security buffer offset %d", 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; if (rsp == NULL) { rc = -EIO; 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; cFYI(1, "disconnect session %p", 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; 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; cFYI(1, "TCON"); 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 (rsp == NULL) { rc = -EIO; goto tcon_exit; } if (tcon == NULL) { ses->ipc_tid = rsp->hdr.TreeId; goto tcon_exit; } if (rsp->ShareType & SMB2_SHARE_TYPE_DISK) cFYI(1, "connection to disk share"); else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) { tcon->ipc = true; cFYI(1, "connection to pipe share"); } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) { tcon->print = true; cFYI(1, "connection to printer"); } else { cERROR(1, "unknown share type %d", 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)) cERROR(1, "DFS capability contradicts DFS flag"); tcon_exit: free_rsp_buf(resp_buftype, rsp); kfree(unc_path); return rc; tcon_error_exit: if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) { cERROR(1, "BAD_NETWORK_NAME: %s", 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; cFYI(1, "Tree Disconnect"); 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; } 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) { struct smb2_create_req *req; struct smb2_create_rsp *rsp; struct TCP_Server_Info *server; struct cifs_ses *ses = tcon->ses; struct kvec iov[2]; int resp_buftype; int uni_path_len; int rc = 0; int num_iovecs = 2; cFYI(1, "create/open"); if (ses && (ses->server)) server = ses->server; else return -EIO; rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req); if (rc) return rc; if (enable_oplocks) req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_BATCH; else req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE; 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) - 1 /* 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--; 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 { num_iovecs = 1; req->NameLength = 0; } 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; } if (rsp == NULL) { rc = -EIO; goto creat_exit; } *persistent_fid = rsp->PersistentFileId; *volatile_fid = rsp->VolatileFileId; creat_exit: 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; cFYI(1, "Close"); 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; } if (rsp == NULL) { rc = -EIO; 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) { cERROR(1, "buffer length %d smaller than minimum size %d", buffer_length, min_buf_size); return -EINVAL; } /* check if beyond RFC1001 maximum length */ if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) { cERROR(1, "buffer length %d or smb length %d too large", buffer_length, smb_len); return -EINVAL; } if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) { cERROR(1, "illegal server response, bad offset to data"); 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; } int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *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; cFYI(1, "Query Info"); 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 = FILE_ALL_INFORMATION; 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(sizeof(struct smb2_file_all_info) + MAX_NAME * 2); 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) { cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE); goto qinf_exit; } rsp = (struct smb2_query_info_rsp *)iov[0].iov_base; rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset), le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr, sizeof(struct smb2_file_all_info), (char *)data); qinf_exit: free_rsp_buf(resp_buftype, rsp); return rc; } /* * 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; cFYI(1, "In echo request"); 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, &iov, 1, NULL, smb2_echo_callback, server, CIFS_ECHO_OP); if (rc) cFYI(1, "Echo request failed: %d", rc); cifs_small_buf_release(req); return rc; }